2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
33 * Standards documents from:
34 * http://www.t13.org (ATA standards, PCI DMA IDE spec)
35 * http://www.t10.org (SCSI MMC - for ATAPI MMC)
36 * http://www.sata-io.org (SATA)
37 * http://www.compactflash.org (CF)
38 * http://www.qic.org (QIC157 - Tape and DSC)
39 * http://www.ce-ata.org (CE-ATA: not supported)
43 #include <linux/kernel.h>
44 #include <linux/module.h>
45 #include <linux/pci.h>
46 #include <linux/init.h>
47 #include <linux/list.h>
49 #include <linux/highmem.h>
50 #include <linux/spinlock.h>
51 #include <linux/blkdev.h>
52 #include <linux/delay.h>
53 #include <linux/timer.h>
54 #include <linux/interrupt.h>
55 #include <linux/completion.h>
56 #include <linux/suspend.h>
57 #include <linux/workqueue.h>
58 #include <linux/jiffies.h>
59 #include <linux/scatterlist.h>
61 #include <scsi/scsi.h>
62 #include <scsi/scsi_cmnd.h>
63 #include <scsi/scsi_host.h>
64 #include <linux/libata.h>
65 #include <asm/semaphore.h>
66 #include <asm/byteorder.h>
67 #include <linux/cdrom.h>
72 /* debounce timing parameters in msecs { interval, duration, timeout } */
73 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
74 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
75 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
77 static unsigned int ata_dev_init_params(struct ata_device *dev,
78 u16 heads, u16 sectors);
79 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
80 static unsigned int ata_dev_set_feature(struct ata_device *dev,
81 u8 enable, u8 feature);
82 static void ata_dev_xfermask(struct ata_device *dev);
83 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
85 unsigned int ata_print_id = 1;
86 static struct workqueue_struct *ata_wq;
88 struct workqueue_struct *ata_aux_wq;
90 int atapi_enabled = 1;
91 module_param(atapi_enabled, int, 0444);
92 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
95 module_param(atapi_dmadir, int, 0444);
96 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
98 int atapi_passthru16 = 1;
99 module_param(atapi_passthru16, int, 0444);
100 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
103 module_param_named(fua, libata_fua, int, 0444);
104 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
106 static int ata_ignore_hpa;
107 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
108 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
110 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
111 module_param_named(dma, libata_dma_mask, int, 0444);
112 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
114 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
115 module_param(ata_probe_timeout, int, 0444);
116 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
118 int libata_noacpi = 0;
119 module_param_named(noacpi, libata_noacpi, int, 0444);
120 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
122 int libata_allow_tpm = 0;
123 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
124 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
126 MODULE_AUTHOR("Jeff Garzik");
127 MODULE_DESCRIPTION("Library module for ATA devices");
128 MODULE_LICENSE("GPL");
129 MODULE_VERSION(DRV_VERSION);
133 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
134 * @tf: Taskfile to convert
135 * @pmp: Port multiplier port
136 * @is_cmd: This FIS is for command
137 * @fis: Buffer into which data will output
139 * Converts a standard ATA taskfile to a Serial ATA
140 * FIS structure (Register - Host to Device).
143 * Inherited from caller.
145 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
147 fis[0] = 0x27; /* Register - Host to Device FIS */
148 fis[1] = pmp & 0xf; /* Port multiplier number*/
150 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
152 fis[2] = tf->command;
153 fis[3] = tf->feature;
160 fis[8] = tf->hob_lbal;
161 fis[9] = tf->hob_lbam;
162 fis[10] = tf->hob_lbah;
163 fis[11] = tf->hob_feature;
166 fis[13] = tf->hob_nsect;
177 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
178 * @fis: Buffer from which data will be input
179 * @tf: Taskfile to output
181 * Converts a serial ATA FIS structure to a standard ATA taskfile.
184 * Inherited from caller.
187 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
189 tf->command = fis[2]; /* status */
190 tf->feature = fis[3]; /* error */
197 tf->hob_lbal = fis[8];
198 tf->hob_lbam = fis[9];
199 tf->hob_lbah = fis[10];
202 tf->hob_nsect = fis[13];
205 static const u8 ata_rw_cmds[] = {
209 ATA_CMD_READ_MULTI_EXT,
210 ATA_CMD_WRITE_MULTI_EXT,
214 ATA_CMD_WRITE_MULTI_FUA_EXT,
218 ATA_CMD_PIO_READ_EXT,
219 ATA_CMD_PIO_WRITE_EXT,
232 ATA_CMD_WRITE_FUA_EXT
236 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
237 * @tf: command to examine and configure
238 * @dev: device tf belongs to
240 * Examine the device configuration and tf->flags to calculate
241 * the proper read/write commands and protocol to use.
246 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
250 int index, fua, lba48, write;
252 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
253 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
254 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
256 if (dev->flags & ATA_DFLAG_PIO) {
257 tf->protocol = ATA_PROT_PIO;
258 index = dev->multi_count ? 0 : 8;
259 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
260 /* Unable to use DMA due to host limitation */
261 tf->protocol = ATA_PROT_PIO;
262 index = dev->multi_count ? 0 : 8;
264 tf->protocol = ATA_PROT_DMA;
268 cmd = ata_rw_cmds[index + fua + lba48 + write];
277 * ata_tf_read_block - Read block address from ATA taskfile
278 * @tf: ATA taskfile of interest
279 * @dev: ATA device @tf belongs to
284 * Read block address from @tf. This function can handle all
285 * three address formats - LBA, LBA48 and CHS. tf->protocol and
286 * flags select the address format to use.
289 * Block address read from @tf.
291 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
295 if (tf->flags & ATA_TFLAG_LBA) {
296 if (tf->flags & ATA_TFLAG_LBA48) {
297 block |= (u64)tf->hob_lbah << 40;
298 block |= (u64)tf->hob_lbam << 32;
299 block |= tf->hob_lbal << 24;
301 block |= (tf->device & 0xf) << 24;
303 block |= tf->lbah << 16;
304 block |= tf->lbam << 8;
309 cyl = tf->lbam | (tf->lbah << 8);
310 head = tf->device & 0xf;
313 block = (cyl * dev->heads + head) * dev->sectors + sect;
320 * ata_build_rw_tf - Build ATA taskfile for given read/write request
321 * @tf: Target ATA taskfile
322 * @dev: ATA device @tf belongs to
323 * @block: Block address
324 * @n_block: Number of blocks
325 * @tf_flags: RW/FUA etc...
331 * Build ATA taskfile @tf for read/write request described by
332 * @block, @n_block, @tf_flags and @tag on @dev.
336 * 0 on success, -ERANGE if the request is too large for @dev,
337 * -EINVAL if the request is invalid.
339 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
340 u64 block, u32 n_block, unsigned int tf_flags,
343 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
344 tf->flags |= tf_flags;
346 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
348 if (!lba_48_ok(block, n_block))
351 tf->protocol = ATA_PROT_NCQ;
352 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
354 if (tf->flags & ATA_TFLAG_WRITE)
355 tf->command = ATA_CMD_FPDMA_WRITE;
357 tf->command = ATA_CMD_FPDMA_READ;
359 tf->nsect = tag << 3;
360 tf->hob_feature = (n_block >> 8) & 0xff;
361 tf->feature = n_block & 0xff;
363 tf->hob_lbah = (block >> 40) & 0xff;
364 tf->hob_lbam = (block >> 32) & 0xff;
365 tf->hob_lbal = (block >> 24) & 0xff;
366 tf->lbah = (block >> 16) & 0xff;
367 tf->lbam = (block >> 8) & 0xff;
368 tf->lbal = block & 0xff;
371 if (tf->flags & ATA_TFLAG_FUA)
372 tf->device |= 1 << 7;
373 } else if (dev->flags & ATA_DFLAG_LBA) {
374 tf->flags |= ATA_TFLAG_LBA;
376 if (lba_28_ok(block, n_block)) {
378 tf->device |= (block >> 24) & 0xf;
379 } else if (lba_48_ok(block, n_block)) {
380 if (!(dev->flags & ATA_DFLAG_LBA48))
384 tf->flags |= ATA_TFLAG_LBA48;
386 tf->hob_nsect = (n_block >> 8) & 0xff;
388 tf->hob_lbah = (block >> 40) & 0xff;
389 tf->hob_lbam = (block >> 32) & 0xff;
390 tf->hob_lbal = (block >> 24) & 0xff;
392 /* request too large even for LBA48 */
395 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
398 tf->nsect = n_block & 0xff;
400 tf->lbah = (block >> 16) & 0xff;
401 tf->lbam = (block >> 8) & 0xff;
402 tf->lbal = block & 0xff;
404 tf->device |= ATA_LBA;
407 u32 sect, head, cyl, track;
409 /* The request -may- be too large for CHS addressing. */
410 if (!lba_28_ok(block, n_block))
413 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
416 /* Convert LBA to CHS */
417 track = (u32)block / dev->sectors;
418 cyl = track / dev->heads;
419 head = track % dev->heads;
420 sect = (u32)block % dev->sectors + 1;
422 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
423 (u32)block, track, cyl, head, sect);
425 /* Check whether the converted CHS can fit.
429 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
432 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
443 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
444 * @pio_mask: pio_mask
445 * @mwdma_mask: mwdma_mask
446 * @udma_mask: udma_mask
448 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
449 * unsigned int xfer_mask.
457 unsigned long ata_pack_xfermask(unsigned long pio_mask,
458 unsigned long mwdma_mask,
459 unsigned long udma_mask)
461 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
462 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
463 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
467 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
468 * @xfer_mask: xfer_mask to unpack
469 * @pio_mask: resulting pio_mask
470 * @mwdma_mask: resulting mwdma_mask
471 * @udma_mask: resulting udma_mask
473 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
474 * Any NULL distination masks will be ignored.
476 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
477 unsigned long *mwdma_mask, unsigned long *udma_mask)
480 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
482 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
484 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
487 static const struct ata_xfer_ent {
491 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
492 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
493 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
498 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
499 * @xfer_mask: xfer_mask of interest
501 * Return matching XFER_* value for @xfer_mask. Only the highest
502 * bit of @xfer_mask is considered.
508 * Matching XFER_* value, 0xff if no match found.
510 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
512 int highbit = fls(xfer_mask) - 1;
513 const struct ata_xfer_ent *ent;
515 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
516 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
517 return ent->base + highbit - ent->shift;
522 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
523 * @xfer_mode: XFER_* of interest
525 * Return matching xfer_mask for @xfer_mode.
531 * Matching xfer_mask, 0 if no match found.
533 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
535 const struct ata_xfer_ent *ent;
537 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
538 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
539 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
540 & ~((1 << ent->shift) - 1);
545 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
546 * @xfer_mode: XFER_* of interest
548 * Return matching xfer_shift for @xfer_mode.
554 * Matching xfer_shift, -1 if no match found.
556 int ata_xfer_mode2shift(unsigned long xfer_mode)
558 const struct ata_xfer_ent *ent;
560 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
561 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
567 * ata_mode_string - convert xfer_mask to string
568 * @xfer_mask: mask of bits supported; only highest bit counts.
570 * Determine string which represents the highest speed
571 * (highest bit in @modemask).
577 * Constant C string representing highest speed listed in
578 * @mode_mask, or the constant C string "<n/a>".
580 const char *ata_mode_string(unsigned long xfer_mask)
582 static const char * const xfer_mode_str[] = {
606 highbit = fls(xfer_mask) - 1;
607 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
608 return xfer_mode_str[highbit];
612 static const char *sata_spd_string(unsigned int spd)
614 static const char * const spd_str[] = {
619 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
621 return spd_str[spd - 1];
624 void ata_dev_disable(struct ata_device *dev)
626 if (ata_dev_enabled(dev)) {
627 if (ata_msg_drv(dev->link->ap))
628 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
629 ata_acpi_on_disable(dev);
630 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
636 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
638 struct ata_link *link = dev->link;
639 struct ata_port *ap = link->ap;
641 unsigned int err_mask;
645 * disallow DIPM for drivers which haven't set
646 * ATA_FLAG_IPM. This is because when DIPM is enabled,
647 * phy ready will be set in the interrupt status on
648 * state changes, which will cause some drivers to
649 * think there are errors - additionally drivers will
650 * need to disable hot plug.
652 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
653 ap->pm_policy = NOT_AVAILABLE;
658 * For DIPM, we will only enable it for the
661 * Why? Because Disks are too stupid to know that
662 * If the host rejects a request to go to SLUMBER
663 * they should retry at PARTIAL, and instead it
664 * just would give up. So, for medium_power to
665 * work at all, we need to only allow HIPM.
667 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
673 /* no restrictions on IPM transitions */
674 scontrol &= ~(0x3 << 8);
675 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
680 if (dev->flags & ATA_DFLAG_DIPM)
681 err_mask = ata_dev_set_feature(dev,
682 SETFEATURES_SATA_ENABLE, SATA_DIPM);
685 /* allow IPM to PARTIAL */
686 scontrol &= ~(0x1 << 8);
687 scontrol |= (0x2 << 8);
688 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
693 * we don't have to disable DIPM since IPM flags
694 * disallow transitions to SLUMBER, which effectively
695 * disable DIPM if it does not support PARTIAL
699 case MAX_PERFORMANCE:
700 /* disable all IPM transitions */
701 scontrol |= (0x3 << 8);
702 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
707 * we don't have to disable DIPM since IPM flags
708 * disallow all transitions which effectively
709 * disable DIPM anyway.
714 /* FIXME: handle SET FEATURES failure */
721 * ata_dev_enable_pm - enable SATA interface power management
722 * @dev: device to enable power management
723 * @policy: the link power management policy
725 * Enable SATA Interface power management. This will enable
726 * Device Interface Power Management (DIPM) for min_power
727 * policy, and then call driver specific callbacks for
728 * enabling Host Initiated Power management.
731 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
733 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
736 struct ata_port *ap = dev->link->ap;
738 /* set HIPM first, then DIPM */
739 if (ap->ops->enable_pm)
740 rc = ap->ops->enable_pm(ap, policy);
743 rc = ata_dev_set_dipm(dev, policy);
747 ap->pm_policy = MAX_PERFORMANCE;
749 ap->pm_policy = policy;
750 return /* rc */; /* hopefully we can use 'rc' eventually */
755 * ata_dev_disable_pm - disable SATA interface power management
756 * @dev: device to disable power management
758 * Disable SATA Interface power management. This will disable
759 * Device Interface Power Management (DIPM) without changing
760 * policy, call driver specific callbacks for disabling Host
761 * Initiated Power management.
766 static void ata_dev_disable_pm(struct ata_device *dev)
768 struct ata_port *ap = dev->link->ap;
770 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
771 if (ap->ops->disable_pm)
772 ap->ops->disable_pm(ap);
774 #endif /* CONFIG_PM */
776 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
778 ap->pm_policy = policy;
779 ap->link.eh_info.action |= ATA_EHI_LPM;
780 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
781 ata_port_schedule_eh(ap);
785 static void ata_lpm_enable(struct ata_host *host)
787 struct ata_link *link;
789 struct ata_device *dev;
792 for (i = 0; i < host->n_ports; i++) {
794 ata_port_for_each_link(link, ap) {
795 ata_link_for_each_dev(dev, link)
796 ata_dev_disable_pm(dev);
801 static void ata_lpm_disable(struct ata_host *host)
805 for (i = 0; i < host->n_ports; i++) {
806 struct ata_port *ap = host->ports[i];
807 ata_lpm_schedule(ap, ap->pm_policy);
810 #endif /* CONFIG_PM */
814 * ata_devchk - PATA device presence detection
815 * @ap: ATA channel to examine
816 * @device: Device to examine (starting at zero)
818 * This technique was originally described in
819 * Hale Landis's ATADRVR (www.ata-atapi.com), and
820 * later found its way into the ATA/ATAPI spec.
822 * Write a pattern to the ATA shadow registers,
823 * and if a device is present, it will respond by
824 * correctly storing and echoing back the
825 * ATA shadow register contents.
831 static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
833 struct ata_ioports *ioaddr = &ap->ioaddr;
836 ap->ops->dev_select(ap, device);
838 iowrite8(0x55, ioaddr->nsect_addr);
839 iowrite8(0xaa, ioaddr->lbal_addr);
841 iowrite8(0xaa, ioaddr->nsect_addr);
842 iowrite8(0x55, ioaddr->lbal_addr);
844 iowrite8(0x55, ioaddr->nsect_addr);
845 iowrite8(0xaa, ioaddr->lbal_addr);
847 nsect = ioread8(ioaddr->nsect_addr);
848 lbal = ioread8(ioaddr->lbal_addr);
850 if ((nsect == 0x55) && (lbal == 0xaa))
851 return 1; /* we found a device */
853 return 0; /* nothing found */
857 * ata_dev_classify - determine device type based on ATA-spec signature
858 * @tf: ATA taskfile register set for device to be identified
860 * Determine from taskfile register contents whether a device is
861 * ATA or ATAPI, as per "Signature and persistence" section
862 * of ATA/PI spec (volume 1, sect 5.14).
868 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
869 * %ATA_DEV_UNKNOWN the event of failure.
871 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
873 /* Apple's open source Darwin code hints that some devices only
874 * put a proper signature into the LBA mid/high registers,
875 * So, we only check those. It's sufficient for uniqueness.
877 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
878 * signatures for ATA and ATAPI devices attached on SerialATA,
879 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
880 * spec has never mentioned about using different signatures
881 * for ATA/ATAPI devices. Then, Serial ATA II: Port
882 * Multiplier specification began to use 0x69/0x96 to identify
883 * port multpliers and 0x3c/0xc3 to identify SEMB device.
884 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
885 * 0x69/0x96 shortly and described them as reserved for
888 * We follow the current spec and consider that 0x69/0x96
889 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
891 if ((tf->lbam == 0) && (tf->lbah == 0)) {
892 DPRINTK("found ATA device by sig\n");
896 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
897 DPRINTK("found ATAPI device by sig\n");
898 return ATA_DEV_ATAPI;
901 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
902 DPRINTK("found PMP device by sig\n");
906 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
907 printk(KERN_INFO "ata: SEMB device ignored\n");
908 return ATA_DEV_SEMB_UNSUP; /* not yet */
911 DPRINTK("unknown device\n");
912 return ATA_DEV_UNKNOWN;
916 * ata_dev_try_classify - Parse returned ATA device signature
917 * @dev: ATA device to classify (starting at zero)
918 * @present: device seems present
919 * @r_err: Value of error register on completion
921 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
922 * an ATA/ATAPI-defined set of values is placed in the ATA
923 * shadow registers, indicating the results of device detection
926 * Select the ATA device, and read the values from the ATA shadow
927 * registers. Then parse according to the Error register value,
928 * and the spec-defined values examined by ata_dev_classify().
934 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
936 unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
939 struct ata_port *ap = dev->link->ap;
940 struct ata_taskfile tf;
944 ap->ops->dev_select(ap, dev->devno);
946 memset(&tf, 0, sizeof(tf));
948 ap->ops->tf_read(ap, &tf);
953 /* see if device passed diags: if master then continue and warn later */
954 if (err == 0 && dev->devno == 0)
955 /* diagnostic fail : do nothing _YET_ */
956 dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
959 else if ((dev->devno == 0) && (err == 0x81))
964 /* determine if device is ATA or ATAPI */
965 class = ata_dev_classify(&tf);
967 if (class == ATA_DEV_UNKNOWN) {
968 /* If the device failed diagnostic, it's likely to
969 * have reported incorrect device signature too.
970 * Assume ATA device if the device seems present but
971 * device signature is invalid with diagnostic
974 if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
977 class = ATA_DEV_NONE;
978 } else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
979 class = ATA_DEV_NONE;
985 * ata_id_string - Convert IDENTIFY DEVICE page into string
986 * @id: IDENTIFY DEVICE results we will examine
987 * @s: string into which data is output
988 * @ofs: offset into identify device page
989 * @len: length of string to return. must be an even number.
991 * The strings in the IDENTIFY DEVICE page are broken up into
992 * 16-bit chunks. Run through the string, and output each
993 * 8-bit chunk linearly, regardless of platform.
999 void ata_id_string(const u16 *id, unsigned char *s,
1000 unsigned int ofs, unsigned int len)
1019 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1020 * @id: IDENTIFY DEVICE results we will examine
1021 * @s: string into which data is output
1022 * @ofs: offset into identify device page
1023 * @len: length of string to return. must be an odd number.
1025 * This function is identical to ata_id_string except that it
1026 * trims trailing spaces and terminates the resulting string with
1027 * null. @len must be actual maximum length (even number) + 1.
1032 void ata_id_c_string(const u16 *id, unsigned char *s,
1033 unsigned int ofs, unsigned int len)
1037 WARN_ON(!(len & 1));
1039 ata_id_string(id, s, ofs, len - 1);
1041 p = s + strnlen(s, len - 1);
1042 while (p > s && p[-1] == ' ')
1047 static u64 ata_id_n_sectors(const u16 *id)
1049 if (ata_id_has_lba(id)) {
1050 if (ata_id_has_lba48(id))
1051 return ata_id_u64(id, 100);
1053 return ata_id_u32(id, 60);
1055 if (ata_id_current_chs_valid(id))
1056 return ata_id_u32(id, 57);
1058 return id[1] * id[3] * id[6];
1062 static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
1066 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1067 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1068 sectors |= (tf->hob_lbal & 0xff) << 24;
1069 sectors |= (tf->lbah & 0xff) << 16;
1070 sectors |= (tf->lbam & 0xff) << 8;
1071 sectors |= (tf->lbal & 0xff);
1076 static u64 ata_tf_to_lba(struct ata_taskfile *tf)
1080 sectors |= (tf->device & 0x0f) << 24;
1081 sectors |= (tf->lbah & 0xff) << 16;
1082 sectors |= (tf->lbam & 0xff) << 8;
1083 sectors |= (tf->lbal & 0xff);
1089 * ata_read_native_max_address - Read native max address
1090 * @dev: target device
1091 * @max_sectors: out parameter for the result native max address
1093 * Perform an LBA48 or LBA28 native size query upon the device in
1097 * 0 on success, -EACCES if command is aborted by the drive.
1098 * -EIO on other errors.
1100 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1102 unsigned int err_mask;
1103 struct ata_taskfile tf;
1104 int lba48 = ata_id_has_lba48(dev->id);
1106 ata_tf_init(dev, &tf);
1108 /* always clear all address registers */
1109 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1112 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1113 tf.flags |= ATA_TFLAG_LBA48;
1115 tf.command = ATA_CMD_READ_NATIVE_MAX;
1117 tf.protocol |= ATA_PROT_NODATA;
1118 tf.device |= ATA_LBA;
1120 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1122 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1123 "max address (err_mask=0x%x)\n", err_mask);
1124 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1130 *max_sectors = ata_tf_to_lba48(&tf);
1132 *max_sectors = ata_tf_to_lba(&tf);
1133 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1139 * ata_set_max_sectors - Set max sectors
1140 * @dev: target device
1141 * @new_sectors: new max sectors value to set for the device
1143 * Set max sectors of @dev to @new_sectors.
1146 * 0 on success, -EACCES if command is aborted or denied (due to
1147 * previous non-volatile SET_MAX) by the drive. -EIO on other
1150 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1152 unsigned int err_mask;
1153 struct ata_taskfile tf;
1154 int lba48 = ata_id_has_lba48(dev->id);
1158 ata_tf_init(dev, &tf);
1160 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1163 tf.command = ATA_CMD_SET_MAX_EXT;
1164 tf.flags |= ATA_TFLAG_LBA48;
1166 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1167 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1168 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1170 tf.command = ATA_CMD_SET_MAX;
1172 tf.device |= (new_sectors >> 24) & 0xf;
1175 tf.protocol |= ATA_PROT_NODATA;
1176 tf.device |= ATA_LBA;
1178 tf.lbal = (new_sectors >> 0) & 0xff;
1179 tf.lbam = (new_sectors >> 8) & 0xff;
1180 tf.lbah = (new_sectors >> 16) & 0xff;
1182 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1184 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1185 "max address (err_mask=0x%x)\n", err_mask);
1186 if (err_mask == AC_ERR_DEV &&
1187 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1196 * ata_hpa_resize - Resize a device with an HPA set
1197 * @dev: Device to resize
1199 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1200 * it if required to the full size of the media. The caller must check
1201 * the drive has the HPA feature set enabled.
1204 * 0 on success, -errno on failure.
1206 static int ata_hpa_resize(struct ata_device *dev)
1208 struct ata_eh_context *ehc = &dev->link->eh_context;
1209 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1210 u64 sectors = ata_id_n_sectors(dev->id);
1214 /* do we need to do it? */
1215 if (dev->class != ATA_DEV_ATA ||
1216 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1217 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1220 /* read native max address */
1221 rc = ata_read_native_max_address(dev, &native_sectors);
1223 /* If HPA isn't going to be unlocked, skip HPA
1224 * resizing from the next try.
1226 if (!ata_ignore_hpa) {
1227 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1228 "broken, will skip HPA handling\n");
1229 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1231 /* we can continue if device aborted the command */
1239 /* nothing to do? */
1240 if (native_sectors <= sectors || !ata_ignore_hpa) {
1241 if (!print_info || native_sectors == sectors)
1244 if (native_sectors > sectors)
1245 ata_dev_printk(dev, KERN_INFO,
1246 "HPA detected: current %llu, native %llu\n",
1247 (unsigned long long)sectors,
1248 (unsigned long long)native_sectors);
1249 else if (native_sectors < sectors)
1250 ata_dev_printk(dev, KERN_WARNING,
1251 "native sectors (%llu) is smaller than "
1253 (unsigned long long)native_sectors,
1254 (unsigned long long)sectors);
1258 /* let's unlock HPA */
1259 rc = ata_set_max_sectors(dev, native_sectors);
1260 if (rc == -EACCES) {
1261 /* if device aborted the command, skip HPA resizing */
1262 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1263 "(%llu -> %llu), skipping HPA handling\n",
1264 (unsigned long long)sectors,
1265 (unsigned long long)native_sectors);
1266 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1271 /* re-read IDENTIFY data */
1272 rc = ata_dev_reread_id(dev, 0);
1274 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1275 "data after HPA resizing\n");
1280 u64 new_sectors = ata_id_n_sectors(dev->id);
1281 ata_dev_printk(dev, KERN_INFO,
1282 "HPA unlocked: %llu -> %llu, native %llu\n",
1283 (unsigned long long)sectors,
1284 (unsigned long long)new_sectors,
1285 (unsigned long long)native_sectors);
1292 * ata_noop_dev_select - Select device 0/1 on ATA bus
1293 * @ap: ATA channel to manipulate
1294 * @device: ATA device (numbered from zero) to select
1296 * This function performs no actual function.
1298 * May be used as the dev_select() entry in ata_port_operations.
1303 void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
1309 * ata_std_dev_select - Select device 0/1 on ATA bus
1310 * @ap: ATA channel to manipulate
1311 * @device: ATA device (numbered from zero) to select
1313 * Use the method defined in the ATA specification to
1314 * make either device 0, or device 1, active on the
1315 * ATA channel. Works with both PIO and MMIO.
1317 * May be used as the dev_select() entry in ata_port_operations.
1323 void ata_std_dev_select(struct ata_port *ap, unsigned int device)
1328 tmp = ATA_DEVICE_OBS;
1330 tmp = ATA_DEVICE_OBS | ATA_DEV1;
1332 iowrite8(tmp, ap->ioaddr.device_addr);
1333 ata_pause(ap); /* needed; also flushes, for mmio */
1337 * ata_dev_select - Select device 0/1 on ATA bus
1338 * @ap: ATA channel to manipulate
1339 * @device: ATA device (numbered from zero) to select
1340 * @wait: non-zero to wait for Status register BSY bit to clear
1341 * @can_sleep: non-zero if context allows sleeping
1343 * Use the method defined in the ATA specification to
1344 * make either device 0, or device 1, active on the
1347 * This is a high-level version of ata_std_dev_select(),
1348 * which additionally provides the services of inserting
1349 * the proper pauses and status polling, where needed.
1355 void ata_dev_select(struct ata_port *ap, unsigned int device,
1356 unsigned int wait, unsigned int can_sleep)
1358 if (ata_msg_probe(ap))
1359 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
1360 "device %u, wait %u\n", device, wait);
1365 ap->ops->dev_select(ap, device);
1368 if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
1375 * ata_dump_id - IDENTIFY DEVICE info debugging output
1376 * @id: IDENTIFY DEVICE page to dump
1378 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1385 static inline void ata_dump_id(const u16 *id)
1387 DPRINTK("49==0x%04x "
1397 DPRINTK("80==0x%04x "
1407 DPRINTK("88==0x%04x "
1414 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1415 * @id: IDENTIFY data to compute xfer mask from
1417 * Compute the xfermask for this device. This is not as trivial
1418 * as it seems if we must consider early devices correctly.
1420 * FIXME: pre IDE drive timing (do we care ?).
1428 unsigned long ata_id_xfermask(const u16 *id)
1430 unsigned long pio_mask, mwdma_mask, udma_mask;
1432 /* Usual case. Word 53 indicates word 64 is valid */
1433 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1434 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1438 /* If word 64 isn't valid then Word 51 high byte holds
1439 * the PIO timing number for the maximum. Turn it into
1442 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1443 if (mode < 5) /* Valid PIO range */
1444 pio_mask = (2 << mode) - 1;
1448 /* But wait.. there's more. Design your standards by
1449 * committee and you too can get a free iordy field to
1450 * process. However its the speeds not the modes that
1451 * are supported... Note drivers using the timing API
1452 * will get this right anyway
1456 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1458 if (ata_id_is_cfa(id)) {
1460 * Process compact flash extended modes
1462 int pio = id[163] & 0x7;
1463 int dma = (id[163] >> 3) & 7;
1466 pio_mask |= (1 << 5);
1468 pio_mask |= (1 << 6);
1470 mwdma_mask |= (1 << 3);
1472 mwdma_mask |= (1 << 4);
1476 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1477 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1479 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1483 * ata_port_queue_task - Queue port_task
1484 * @ap: The ata_port to queue port_task for
1485 * @fn: workqueue function to be scheduled
1486 * @data: data for @fn to use
1487 * @delay: delay time for workqueue function
1489 * Schedule @fn(@data) for execution after @delay jiffies using
1490 * port_task. There is one port_task per port and it's the
1491 * user(low level driver)'s responsibility to make sure that only
1492 * one task is active at any given time.
1494 * libata core layer takes care of synchronization between
1495 * port_task and EH. ata_port_queue_task() may be ignored for EH
1499 * Inherited from caller.
1501 void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
1502 unsigned long delay)
1504 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1505 ap->port_task_data = data;
1507 /* may fail if ata_port_flush_task() in progress */
1508 queue_delayed_work(ata_wq, &ap->port_task, delay);
1512 * ata_port_flush_task - Flush port_task
1513 * @ap: The ata_port to flush port_task for
1515 * After this function completes, port_task is guranteed not to
1516 * be running or scheduled.
1519 * Kernel thread context (may sleep)
1521 void ata_port_flush_task(struct ata_port *ap)
1525 cancel_rearming_delayed_work(&ap->port_task);
1527 if (ata_msg_ctl(ap))
1528 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
1531 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1533 struct completion *waiting = qc->private_data;
1539 * ata_exec_internal_sg - execute libata internal command
1540 * @dev: Device to which the command is sent
1541 * @tf: Taskfile registers for the command and the result
1542 * @cdb: CDB for packet command
1543 * @dma_dir: Data tranfer direction of the command
1544 * @sgl: sg list for the data buffer of the command
1545 * @n_elem: Number of sg entries
1546 * @timeout: Timeout in msecs (0 for default)
1548 * Executes libata internal command with timeout. @tf contains
1549 * command on entry and result on return. Timeout and error
1550 * conditions are reported via return value. No recovery action
1551 * is taken after a command times out. It's caller's duty to
1552 * clean up after timeout.
1555 * None. Should be called with kernel context, might sleep.
1558 * Zero on success, AC_ERR_* mask on failure
1560 unsigned ata_exec_internal_sg(struct ata_device *dev,
1561 struct ata_taskfile *tf, const u8 *cdb,
1562 int dma_dir, struct scatterlist *sgl,
1563 unsigned int n_elem, unsigned long timeout)
1565 struct ata_link *link = dev->link;
1566 struct ata_port *ap = link->ap;
1567 u8 command = tf->command;
1568 struct ata_queued_cmd *qc;
1569 unsigned int tag, preempted_tag;
1570 u32 preempted_sactive, preempted_qc_active;
1571 int preempted_nr_active_links;
1572 DECLARE_COMPLETION_ONSTACK(wait);
1573 unsigned long flags;
1574 unsigned int err_mask;
1577 spin_lock_irqsave(ap->lock, flags);
1579 /* no internal command while frozen */
1580 if (ap->pflags & ATA_PFLAG_FROZEN) {
1581 spin_unlock_irqrestore(ap->lock, flags);
1582 return AC_ERR_SYSTEM;
1585 /* initialize internal qc */
1587 /* XXX: Tag 0 is used for drivers with legacy EH as some
1588 * drivers choke if any other tag is given. This breaks
1589 * ata_tag_internal() test for those drivers. Don't use new
1590 * EH stuff without converting to it.
1592 if (ap->ops->error_handler)
1593 tag = ATA_TAG_INTERNAL;
1597 if (test_and_set_bit(tag, &ap->qc_allocated))
1599 qc = __ata_qc_from_tag(ap, tag);
1607 preempted_tag = link->active_tag;
1608 preempted_sactive = link->sactive;
1609 preempted_qc_active = ap->qc_active;
1610 preempted_nr_active_links = ap->nr_active_links;
1611 link->active_tag = ATA_TAG_POISON;
1614 ap->nr_active_links = 0;
1616 /* prepare & issue qc */
1619 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1620 qc->flags |= ATA_QCFLAG_RESULT_TF;
1621 qc->dma_dir = dma_dir;
1622 if (dma_dir != DMA_NONE) {
1623 unsigned int i, buflen = 0;
1624 struct scatterlist *sg;
1626 for_each_sg(sgl, sg, n_elem, i)
1627 buflen += sg->length;
1629 ata_sg_init(qc, sgl, n_elem);
1630 qc->nbytes = buflen;
1633 qc->private_data = &wait;
1634 qc->complete_fn = ata_qc_complete_internal;
1638 spin_unlock_irqrestore(ap->lock, flags);
1641 timeout = ata_probe_timeout * 1000 / HZ;
1643 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1645 ata_port_flush_task(ap);
1648 spin_lock_irqsave(ap->lock, flags);
1650 /* We're racing with irq here. If we lose, the
1651 * following test prevents us from completing the qc
1652 * twice. If we win, the port is frozen and will be
1653 * cleaned up by ->post_internal_cmd().
1655 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1656 qc->err_mask |= AC_ERR_TIMEOUT;
1658 if (ap->ops->error_handler)
1659 ata_port_freeze(ap);
1661 ata_qc_complete(qc);
1663 if (ata_msg_warn(ap))
1664 ata_dev_printk(dev, KERN_WARNING,
1665 "qc timeout (cmd 0x%x)\n", command);
1668 spin_unlock_irqrestore(ap->lock, flags);
1671 /* do post_internal_cmd */
1672 if (ap->ops->post_internal_cmd)
1673 ap->ops->post_internal_cmd(qc);
1675 /* perform minimal error analysis */
1676 if (qc->flags & ATA_QCFLAG_FAILED) {
1677 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1678 qc->err_mask |= AC_ERR_DEV;
1681 qc->err_mask |= AC_ERR_OTHER;
1683 if (qc->err_mask & ~AC_ERR_OTHER)
1684 qc->err_mask &= ~AC_ERR_OTHER;
1688 spin_lock_irqsave(ap->lock, flags);
1690 *tf = qc->result_tf;
1691 err_mask = qc->err_mask;
1694 link->active_tag = preempted_tag;
1695 link->sactive = preempted_sactive;
1696 ap->qc_active = preempted_qc_active;
1697 ap->nr_active_links = preempted_nr_active_links;
1699 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1700 * Until those drivers are fixed, we detect the condition
1701 * here, fail the command with AC_ERR_SYSTEM and reenable the
1704 * Note that this doesn't change any behavior as internal
1705 * command failure results in disabling the device in the
1706 * higher layer for LLDDs without new reset/EH callbacks.
1708 * Kill the following code as soon as those drivers are fixed.
1710 if (ap->flags & ATA_FLAG_DISABLED) {
1711 err_mask |= AC_ERR_SYSTEM;
1715 spin_unlock_irqrestore(ap->lock, flags);
1721 * ata_exec_internal - execute libata internal command
1722 * @dev: Device to which the command is sent
1723 * @tf: Taskfile registers for the command and the result
1724 * @cdb: CDB for packet command
1725 * @dma_dir: Data tranfer direction of the command
1726 * @buf: Data buffer of the command
1727 * @buflen: Length of data buffer
1728 * @timeout: Timeout in msecs (0 for default)
1730 * Wrapper around ata_exec_internal_sg() which takes simple
1731 * buffer instead of sg list.
1734 * None. Should be called with kernel context, might sleep.
1737 * Zero on success, AC_ERR_* mask on failure
1739 unsigned ata_exec_internal(struct ata_device *dev,
1740 struct ata_taskfile *tf, const u8 *cdb,
1741 int dma_dir, void *buf, unsigned int buflen,
1742 unsigned long timeout)
1744 struct scatterlist *psg = NULL, sg;
1745 unsigned int n_elem = 0;
1747 if (dma_dir != DMA_NONE) {
1749 sg_init_one(&sg, buf, buflen);
1754 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1759 * ata_do_simple_cmd - execute simple internal command
1760 * @dev: Device to which the command is sent
1761 * @cmd: Opcode to execute
1763 * Execute a 'simple' command, that only consists of the opcode
1764 * 'cmd' itself, without filling any other registers
1767 * Kernel thread context (may sleep).
1770 * Zero on success, AC_ERR_* mask on failure
1772 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1774 struct ata_taskfile tf;
1776 ata_tf_init(dev, &tf);
1779 tf.flags |= ATA_TFLAG_DEVICE;
1780 tf.protocol = ATA_PROT_NODATA;
1782 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1786 * ata_pio_need_iordy - check if iordy needed
1789 * Check if the current speed of the device requires IORDY. Used
1790 * by various controllers for chip configuration.
1793 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1795 /* Controller doesn't support IORDY. Probably a pointless check
1796 as the caller should know this */
1797 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1799 /* PIO3 and higher it is mandatory */
1800 if (adev->pio_mode > XFER_PIO_2)
1802 /* We turn it on when possible */
1803 if (ata_id_has_iordy(adev->id))
1809 * ata_pio_mask_no_iordy - Return the non IORDY mask
1812 * Compute the highest mode possible if we are not using iordy. Return
1813 * -1 if no iordy mode is available.
1816 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1818 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1819 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1820 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1821 /* Is the speed faster than the drive allows non IORDY ? */
1823 /* This is cycle times not frequency - watch the logic! */
1824 if (pio > 240) /* PIO2 is 240nS per cycle */
1825 return 3 << ATA_SHIFT_PIO;
1826 return 7 << ATA_SHIFT_PIO;
1829 return 3 << ATA_SHIFT_PIO;
1833 * ata_dev_read_id - Read ID data from the specified device
1834 * @dev: target device
1835 * @p_class: pointer to class of the target device (may be changed)
1836 * @flags: ATA_READID_* flags
1837 * @id: buffer to read IDENTIFY data into
1839 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1840 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1841 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1842 * for pre-ATA4 drives.
1844 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1845 * now we abort if we hit that case.
1848 * Kernel thread context (may sleep)
1851 * 0 on success, -errno otherwise.
1853 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1854 unsigned int flags, u16 *id)
1856 struct ata_port *ap = dev->link->ap;
1857 unsigned int class = *p_class;
1858 struct ata_taskfile tf;
1859 unsigned int err_mask = 0;
1861 int may_fallback = 1, tried_spinup = 0;
1864 if (ata_msg_ctl(ap))
1865 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1867 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1869 ata_tf_init(dev, &tf);
1873 tf.command = ATA_CMD_ID_ATA;
1876 tf.command = ATA_CMD_ID_ATAPI;
1880 reason = "unsupported class";
1884 tf.protocol = ATA_PROT_PIO;
1886 /* Some devices choke if TF registers contain garbage. Make
1887 * sure those are properly initialized.
1889 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1891 /* Device presence detection is unreliable on some
1892 * controllers. Always poll IDENTIFY if available.
1894 tf.flags |= ATA_TFLAG_POLLING;
1896 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1897 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1899 if (err_mask & AC_ERR_NODEV_HINT) {
1900 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1901 ap->print_id, dev->devno);
1905 /* Device or controller might have reported the wrong
1906 * device class. Give a shot at the other IDENTIFY if
1907 * the current one is aborted by the device.
1910 (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1913 if (class == ATA_DEV_ATA)
1914 class = ATA_DEV_ATAPI;
1916 class = ATA_DEV_ATA;
1921 reason = "I/O error";
1925 /* Falling back doesn't make sense if ID data was read
1926 * successfully at least once.
1930 swap_buf_le16(id, ATA_ID_WORDS);
1934 reason = "device reports invalid type";
1936 if (class == ATA_DEV_ATA) {
1937 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1940 if (ata_id_is_ata(id))
1944 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1947 * Drive powered-up in standby mode, and requires a specific
1948 * SET_FEATURES spin-up subcommand before it will accept
1949 * anything other than the original IDENTIFY command.
1951 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1952 if (err_mask && id[2] != 0x738c) {
1954 reason = "SPINUP failed";
1958 * If the drive initially returned incomplete IDENTIFY info,
1959 * we now must reissue the IDENTIFY command.
1961 if (id[2] == 0x37c8)
1965 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1967 * The exact sequence expected by certain pre-ATA4 drives is:
1969 * IDENTIFY (optional in early ATA)
1970 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1972 * Some drives were very specific about that exact sequence.
1974 * Note that ATA4 says lba is mandatory so the second check
1975 * shoud never trigger.
1977 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1978 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1981 reason = "INIT_DEV_PARAMS failed";
1985 /* current CHS translation info (id[53-58]) might be
1986 * changed. reread the identify device info.
1988 flags &= ~ATA_READID_POSTRESET;
1998 if (ata_msg_warn(ap))
1999 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2000 "(%s, err_mask=0x%x)\n", reason, err_mask);
2004 static inline u8 ata_dev_knobble(struct ata_device *dev)
2006 struct ata_port *ap = dev->link->ap;
2007 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2010 static void ata_dev_config_ncq(struct ata_device *dev,
2011 char *desc, size_t desc_sz)
2013 struct ata_port *ap = dev->link->ap;
2014 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2016 if (!ata_id_has_ncq(dev->id)) {
2020 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2021 snprintf(desc, desc_sz, "NCQ (not used)");
2024 if (ap->flags & ATA_FLAG_NCQ) {
2025 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2026 dev->flags |= ATA_DFLAG_NCQ;
2029 if (hdepth >= ddepth)
2030 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2032 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2036 * ata_dev_configure - Configure the specified ATA/ATAPI device
2037 * @dev: Target device to configure
2039 * Configure @dev according to @dev->id. Generic and low-level
2040 * driver specific fixups are also applied.
2043 * Kernel thread context (may sleep)
2046 * 0 on success, -errno otherwise
2048 int ata_dev_configure(struct ata_device *dev)
2050 struct ata_port *ap = dev->link->ap;
2051 struct ata_eh_context *ehc = &dev->link->eh_context;
2052 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2053 const u16 *id = dev->id;
2054 unsigned long xfer_mask;
2055 char revbuf[7]; /* XYZ-99\0 */
2056 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2057 char modelbuf[ATA_ID_PROD_LEN+1];
2060 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2061 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2066 if (ata_msg_probe(ap))
2067 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
2070 dev->horkage |= ata_dev_blacklisted(dev);
2072 /* let ACPI work its magic */
2073 rc = ata_acpi_on_devcfg(dev);
2077 /* massage HPA, do it early as it might change IDENTIFY data */
2078 rc = ata_hpa_resize(dev);
2082 /* print device capabilities */
2083 if (ata_msg_probe(ap))
2084 ata_dev_printk(dev, KERN_DEBUG,
2085 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2086 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2088 id[49], id[82], id[83], id[84],
2089 id[85], id[86], id[87], id[88]);
2091 /* initialize to-be-configured parameters */
2092 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2093 dev->max_sectors = 0;
2101 * common ATA, ATAPI feature tests
2104 /* find max transfer mode; for printk only */
2105 xfer_mask = ata_id_xfermask(id);
2107 if (ata_msg_probe(ap))
2110 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2111 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2114 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2117 /* ATA-specific feature tests */
2118 if (dev->class == ATA_DEV_ATA) {
2119 if (ata_id_is_cfa(id)) {
2120 if (id[162] & 1) /* CPRM may make this media unusable */
2121 ata_dev_printk(dev, KERN_WARNING,
2122 "supports DRM functions and may "
2123 "not be fully accessable.\n");
2124 snprintf(revbuf, 7, "CFA");
2126 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2127 /* Warn the user if the device has TPM extensions */
2128 if (ata_id_has_tpm(id))
2129 ata_dev_printk(dev, KERN_WARNING,
2130 "supports DRM functions and may "
2131 "not be fully accessable.\n");
2134 dev->n_sectors = ata_id_n_sectors(id);
2136 if (dev->id[59] & 0x100)
2137 dev->multi_count = dev->id[59] & 0xff;
2139 if (ata_id_has_lba(id)) {
2140 const char *lba_desc;
2144 dev->flags |= ATA_DFLAG_LBA;
2145 if (ata_id_has_lba48(id)) {
2146 dev->flags |= ATA_DFLAG_LBA48;
2149 if (dev->n_sectors >= (1UL << 28) &&
2150 ata_id_has_flush_ext(id))
2151 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2155 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2157 /* print device info to dmesg */
2158 if (ata_msg_drv(ap) && print_info) {
2159 ata_dev_printk(dev, KERN_INFO,
2160 "%s: %s, %s, max %s\n",
2161 revbuf, modelbuf, fwrevbuf,
2162 ata_mode_string(xfer_mask));
2163 ata_dev_printk(dev, KERN_INFO,
2164 "%Lu sectors, multi %u: %s %s\n",
2165 (unsigned long long)dev->n_sectors,
2166 dev->multi_count, lba_desc, ncq_desc);
2171 /* Default translation */
2172 dev->cylinders = id[1];
2174 dev->sectors = id[6];
2176 if (ata_id_current_chs_valid(id)) {
2177 /* Current CHS translation is valid. */
2178 dev->cylinders = id[54];
2179 dev->heads = id[55];
2180 dev->sectors = id[56];
2183 /* print device info to dmesg */
2184 if (ata_msg_drv(ap) && print_info) {
2185 ata_dev_printk(dev, KERN_INFO,
2186 "%s: %s, %s, max %s\n",
2187 revbuf, modelbuf, fwrevbuf,
2188 ata_mode_string(xfer_mask));
2189 ata_dev_printk(dev, KERN_INFO,
2190 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2191 (unsigned long long)dev->n_sectors,
2192 dev->multi_count, dev->cylinders,
2193 dev->heads, dev->sectors);
2200 /* ATAPI-specific feature tests */
2201 else if (dev->class == ATA_DEV_ATAPI) {
2202 const char *cdb_intr_string = "";
2203 const char *atapi_an_string = "";
2206 rc = atapi_cdb_len(id);
2207 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2208 if (ata_msg_warn(ap))
2209 ata_dev_printk(dev, KERN_WARNING,
2210 "unsupported CDB len\n");
2214 dev->cdb_len = (unsigned int) rc;
2216 /* Enable ATAPI AN if both the host and device have
2217 * the support. If PMP is attached, SNTF is required
2218 * to enable ATAPI AN to discern between PHY status
2219 * changed notifications and ATAPI ANs.
2221 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2222 (!ap->nr_pmp_links ||
2223 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2224 unsigned int err_mask;
2226 /* issue SET feature command to turn this on */
2227 err_mask = ata_dev_set_feature(dev,
2228 SETFEATURES_SATA_ENABLE, SATA_AN);
2230 ata_dev_printk(dev, KERN_ERR,
2231 "failed to enable ATAPI AN "
2232 "(err_mask=0x%x)\n", err_mask);
2234 dev->flags |= ATA_DFLAG_AN;
2235 atapi_an_string = ", ATAPI AN";
2239 if (ata_id_cdb_intr(dev->id)) {
2240 dev->flags |= ATA_DFLAG_CDB_INTR;
2241 cdb_intr_string = ", CDB intr";
2244 /* print device info to dmesg */
2245 if (ata_msg_drv(ap) && print_info)
2246 ata_dev_printk(dev, KERN_INFO,
2247 "ATAPI: %s, %s, max %s%s%s\n",
2249 ata_mode_string(xfer_mask),
2250 cdb_intr_string, atapi_an_string);
2253 /* determine max_sectors */
2254 dev->max_sectors = ATA_MAX_SECTORS;
2255 if (dev->flags & ATA_DFLAG_LBA48)
2256 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2258 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2259 if (ata_id_has_hipm(dev->id))
2260 dev->flags |= ATA_DFLAG_HIPM;
2261 if (ata_id_has_dipm(dev->id))
2262 dev->flags |= ATA_DFLAG_DIPM;
2265 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2266 /* Let the user know. We don't want to disallow opens for
2267 rescue purposes, or in case the vendor is just a blithering
2270 ata_dev_printk(dev, KERN_WARNING,
2271 "Drive reports diagnostics failure. This may indicate a drive\n");
2272 ata_dev_printk(dev, KERN_WARNING,
2273 "fault or invalid emulation. Contact drive vendor for information.\n");
2277 /* limit bridge transfers to udma5, 200 sectors */
2278 if (ata_dev_knobble(dev)) {
2279 if (ata_msg_drv(ap) && print_info)
2280 ata_dev_printk(dev, KERN_INFO,
2281 "applying bridge limits\n");
2282 dev->udma_mask &= ATA_UDMA5;
2283 dev->max_sectors = ATA_MAX_SECTORS;
2286 if ((dev->class == ATA_DEV_ATAPI) &&
2287 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2288 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2289 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2292 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2293 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2296 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2297 dev->horkage |= ATA_HORKAGE_IPM;
2299 /* reset link pm_policy for this port to no pm */
2300 ap->pm_policy = MAX_PERFORMANCE;
2303 if (ap->ops->dev_config)
2304 ap->ops->dev_config(dev);
2306 if (ata_msg_probe(ap))
2307 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
2308 __FUNCTION__, ata_chk_status(ap));
2312 if (ata_msg_probe(ap))
2313 ata_dev_printk(dev, KERN_DEBUG,
2314 "%s: EXIT, err\n", __FUNCTION__);
2319 * ata_cable_40wire - return 40 wire cable type
2322 * Helper method for drivers which want to hardwire 40 wire cable
2326 int ata_cable_40wire(struct ata_port *ap)
2328 return ATA_CBL_PATA40;
2332 * ata_cable_80wire - return 80 wire cable type
2335 * Helper method for drivers which want to hardwire 80 wire cable
2339 int ata_cable_80wire(struct ata_port *ap)
2341 return ATA_CBL_PATA80;
2345 * ata_cable_unknown - return unknown PATA cable.
2348 * Helper method for drivers which have no PATA cable detection.
2351 int ata_cable_unknown(struct ata_port *ap)
2353 return ATA_CBL_PATA_UNK;
2357 * ata_cable_ignore - return ignored PATA cable.
2360 * Helper method for drivers which don't use cable type to limit
2363 int ata_cable_ignore(struct ata_port *ap)
2365 return ATA_CBL_PATA_IGN;
2369 * ata_cable_sata - return SATA cable type
2372 * Helper method for drivers which have SATA cables
2375 int ata_cable_sata(struct ata_port *ap)
2377 return ATA_CBL_SATA;
2381 * ata_bus_probe - Reset and probe ATA bus
2384 * Master ATA bus probing function. Initiates a hardware-dependent
2385 * bus reset, then attempts to identify any devices found on
2389 * PCI/etc. bus probe sem.
2392 * Zero on success, negative errno otherwise.
2395 int ata_bus_probe(struct ata_port *ap)
2397 unsigned int classes[ATA_MAX_DEVICES];
2398 int tries[ATA_MAX_DEVICES];
2400 struct ata_device *dev;
2404 ata_link_for_each_dev(dev, &ap->link)
2405 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2408 ata_link_for_each_dev(dev, &ap->link) {
2409 /* If we issue an SRST then an ATA drive (not ATAPI)
2410 * may change configuration and be in PIO0 timing. If
2411 * we do a hard reset (or are coming from power on)
2412 * this is true for ATA or ATAPI. Until we've set a
2413 * suitable controller mode we should not touch the
2414 * bus as we may be talking too fast.
2416 dev->pio_mode = XFER_PIO_0;
2418 /* If the controller has a pio mode setup function
2419 * then use it to set the chipset to rights. Don't
2420 * touch the DMA setup as that will be dealt with when
2421 * configuring devices.
2423 if (ap->ops->set_piomode)
2424 ap->ops->set_piomode(ap, dev);
2427 /* reset and determine device classes */
2428 ap->ops->phy_reset(ap);
2430 ata_link_for_each_dev(dev, &ap->link) {
2431 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2432 dev->class != ATA_DEV_UNKNOWN)
2433 classes[dev->devno] = dev->class;
2435 classes[dev->devno] = ATA_DEV_NONE;
2437 dev->class = ATA_DEV_UNKNOWN;
2442 /* read IDENTIFY page and configure devices. We have to do the identify
2443 specific sequence bass-ackwards so that PDIAG- is released by
2446 ata_link_for_each_dev(dev, &ap->link) {
2447 if (tries[dev->devno])
2448 dev->class = classes[dev->devno];
2450 if (!ata_dev_enabled(dev))
2453 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2459 /* Now ask for the cable type as PDIAG- should have been released */
2460 if (ap->ops->cable_detect)
2461 ap->cbl = ap->ops->cable_detect(ap);
2463 /* We may have SATA bridge glue hiding here irrespective of the
2464 reported cable types and sensed types */
2465 ata_link_for_each_dev(dev, &ap->link) {
2466 if (!ata_dev_enabled(dev))
2468 /* SATA drives indicate we have a bridge. We don't know which
2469 end of the link the bridge is which is a problem */
2470 if (ata_id_is_sata(dev->id))
2471 ap->cbl = ATA_CBL_SATA;
2474 /* After the identify sequence we can now set up the devices. We do
2475 this in the normal order so that the user doesn't get confused */
2477 ata_link_for_each_dev(dev, &ap->link) {
2478 if (!ata_dev_enabled(dev))
2481 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2482 rc = ata_dev_configure(dev);
2483 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2488 /* configure transfer mode */
2489 rc = ata_set_mode(&ap->link, &dev);
2493 ata_link_for_each_dev(dev, &ap->link)
2494 if (ata_dev_enabled(dev))
2497 /* no device present, disable port */
2498 ata_port_disable(ap);
2502 tries[dev->devno]--;
2506 /* eeek, something went very wrong, give up */
2507 tries[dev->devno] = 0;
2511 /* give it just one more chance */
2512 tries[dev->devno] = min(tries[dev->devno], 1);
2514 if (tries[dev->devno] == 1) {
2515 /* This is the last chance, better to slow
2516 * down than lose it.
2518 sata_down_spd_limit(&ap->link);
2519 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2523 if (!tries[dev->devno])
2524 ata_dev_disable(dev);
2530 * ata_port_probe - Mark port as enabled
2531 * @ap: Port for which we indicate enablement
2533 * Modify @ap data structure such that the system
2534 * thinks that the entire port is enabled.
2536 * LOCKING: host lock, or some other form of
2540 void ata_port_probe(struct ata_port *ap)
2542 ap->flags &= ~ATA_FLAG_DISABLED;
2546 * sata_print_link_status - Print SATA link status
2547 * @link: SATA link to printk link status about
2549 * This function prints link speed and status of a SATA link.
2554 void sata_print_link_status(struct ata_link *link)
2556 u32 sstatus, scontrol, tmp;
2558 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2560 sata_scr_read(link, SCR_CONTROL, &scontrol);
2562 if (ata_link_online(link)) {
2563 tmp = (sstatus >> 4) & 0xf;
2564 ata_link_printk(link, KERN_INFO,
2565 "SATA link up %s (SStatus %X SControl %X)\n",
2566 sata_spd_string(tmp), sstatus, scontrol);
2568 ata_link_printk(link, KERN_INFO,
2569 "SATA link down (SStatus %X SControl %X)\n",
2575 * ata_dev_pair - return other device on cable
2578 * Obtain the other device on the same cable, or if none is
2579 * present NULL is returned
2582 struct ata_device *ata_dev_pair(struct ata_device *adev)
2584 struct ata_link *link = adev->link;
2585 struct ata_device *pair = &link->device[1 - adev->devno];
2586 if (!ata_dev_enabled(pair))
2592 * ata_port_disable - Disable port.
2593 * @ap: Port to be disabled.
2595 * Modify @ap data structure such that the system
2596 * thinks that the entire port is disabled, and should
2597 * never attempt to probe or communicate with devices
2600 * LOCKING: host lock, or some other form of
2604 void ata_port_disable(struct ata_port *ap)
2606 ap->link.device[0].class = ATA_DEV_NONE;
2607 ap->link.device[1].class = ATA_DEV_NONE;
2608 ap->flags |= ATA_FLAG_DISABLED;
2612 * sata_down_spd_limit - adjust SATA spd limit downward
2613 * @link: Link to adjust SATA spd limit for
2615 * Adjust SATA spd limit of @link downward. Note that this
2616 * function only adjusts the limit. The change must be applied
2617 * using sata_set_spd().
2620 * Inherited from caller.
2623 * 0 on success, negative errno on failure
2625 int sata_down_spd_limit(struct ata_link *link)
2627 u32 sstatus, spd, mask;
2630 if (!sata_scr_valid(link))
2633 /* If SCR can be read, use it to determine the current SPD.
2634 * If not, use cached value in link->sata_spd.
2636 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2638 spd = (sstatus >> 4) & 0xf;
2640 spd = link->sata_spd;
2642 mask = link->sata_spd_limit;
2646 /* unconditionally mask off the highest bit */
2647 highbit = fls(mask) - 1;
2648 mask &= ~(1 << highbit);
2650 /* Mask off all speeds higher than or equal to the current
2651 * one. Force 1.5Gbps if current SPD is not available.
2654 mask &= (1 << (spd - 1)) - 1;
2658 /* were we already at the bottom? */
2662 link->sata_spd_limit = mask;
2664 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2665 sata_spd_string(fls(mask)));
2670 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2672 struct ata_link *host_link = &link->ap->link;
2673 u32 limit, target, spd;
2675 limit = link->sata_spd_limit;
2677 /* Don't configure downstream link faster than upstream link.
2678 * It doesn't speed up anything and some PMPs choke on such
2681 if (!ata_is_host_link(link) && host_link->sata_spd)
2682 limit &= (1 << host_link->sata_spd) - 1;
2684 if (limit == UINT_MAX)
2687 target = fls(limit);
2689 spd = (*scontrol >> 4) & 0xf;
2690 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2692 return spd != target;
2696 * sata_set_spd_needed - is SATA spd configuration needed
2697 * @link: Link in question
2699 * Test whether the spd limit in SControl matches
2700 * @link->sata_spd_limit. This function is used to determine
2701 * whether hardreset is necessary to apply SATA spd
2705 * Inherited from caller.
2708 * 1 if SATA spd configuration is needed, 0 otherwise.
2710 int sata_set_spd_needed(struct ata_link *link)
2714 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2717 return __sata_set_spd_needed(link, &scontrol);
2721 * sata_set_spd - set SATA spd according to spd limit
2722 * @link: Link to set SATA spd for
2724 * Set SATA spd of @link according to sata_spd_limit.
2727 * Inherited from caller.
2730 * 0 if spd doesn't need to be changed, 1 if spd has been
2731 * changed. Negative errno if SCR registers are inaccessible.
2733 int sata_set_spd(struct ata_link *link)
2738 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2741 if (!__sata_set_spd_needed(link, &scontrol))
2744 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2751 * This mode timing computation functionality is ported over from
2752 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2755 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2756 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2757 * for UDMA6, which is currently supported only by Maxtor drives.
2759 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2762 static const struct ata_timing ata_timing[] = {
2763 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2764 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2765 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2766 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2767 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2768 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2769 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2770 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2772 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2773 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2774 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2776 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2777 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2778 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2779 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2780 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2782 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2783 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2784 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2785 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2786 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2787 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2788 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2789 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2794 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2795 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2797 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2799 q->setup = EZ(t->setup * 1000, T);
2800 q->act8b = EZ(t->act8b * 1000, T);
2801 q->rec8b = EZ(t->rec8b * 1000, T);
2802 q->cyc8b = EZ(t->cyc8b * 1000, T);
2803 q->active = EZ(t->active * 1000, T);
2804 q->recover = EZ(t->recover * 1000, T);
2805 q->cycle = EZ(t->cycle * 1000, T);
2806 q->udma = EZ(t->udma * 1000, UT);
2809 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2810 struct ata_timing *m, unsigned int what)
2812 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2813 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2814 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2815 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2816 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2817 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2818 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2819 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2822 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
2824 const struct ata_timing *t = ata_timing;
2826 while (xfer_mode > t->mode)
2829 if (xfer_mode == t->mode)
2834 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2835 struct ata_timing *t, int T, int UT)
2837 const struct ata_timing *s;
2838 struct ata_timing p;
2844 if (!(s = ata_timing_find_mode(speed)))
2847 memcpy(t, s, sizeof(*s));
2850 * If the drive is an EIDE drive, it can tell us it needs extended
2851 * PIO/MW_DMA cycle timing.
2854 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2855 memset(&p, 0, sizeof(p));
2856 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2857 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2858 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2859 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2860 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2862 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2866 * Convert the timing to bus clock counts.
2869 ata_timing_quantize(t, t, T, UT);
2872 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2873 * S.M.A.R.T * and some other commands. We have to ensure that the
2874 * DMA cycle timing is slower/equal than the fastest PIO timing.
2877 if (speed > XFER_PIO_6) {
2878 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2879 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2883 * Lengthen active & recovery time so that cycle time is correct.
2886 if (t->act8b + t->rec8b < t->cyc8b) {
2887 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2888 t->rec8b = t->cyc8b - t->act8b;
2891 if (t->active + t->recover < t->cycle) {
2892 t->active += (t->cycle - (t->active + t->recover)) / 2;
2893 t->recover = t->cycle - t->active;
2896 /* In a few cases quantisation may produce enough errors to
2897 leave t->cycle too low for the sum of active and recovery
2898 if so we must correct this */
2899 if (t->active + t->recover > t->cycle)
2900 t->cycle = t->active + t->recover;
2906 * ata_down_xfermask_limit - adjust dev xfer masks downward
2907 * @dev: Device to adjust xfer masks
2908 * @sel: ATA_DNXFER_* selector
2910 * Adjust xfer masks of @dev downward. Note that this function
2911 * does not apply the change. Invoking ata_set_mode() afterwards
2912 * will apply the limit.
2915 * Inherited from caller.
2918 * 0 on success, negative errno on failure
2920 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2923 unsigned long orig_mask, xfer_mask;
2924 unsigned long pio_mask, mwdma_mask, udma_mask;
2927 quiet = !!(sel & ATA_DNXFER_QUIET);
2928 sel &= ~ATA_DNXFER_QUIET;
2930 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
2933 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2936 case ATA_DNXFER_PIO:
2937 highbit = fls(pio_mask) - 1;
2938 pio_mask &= ~(1 << highbit);
2941 case ATA_DNXFER_DMA:
2943 highbit = fls(udma_mask) - 1;
2944 udma_mask &= ~(1 << highbit);
2947 } else if (mwdma_mask) {
2948 highbit = fls(mwdma_mask) - 1;
2949 mwdma_mask &= ~(1 << highbit);
2955 case ATA_DNXFER_40C:
2956 udma_mask &= ATA_UDMA_MASK_40C;
2959 case ATA_DNXFER_FORCE_PIO0:
2961 case ATA_DNXFER_FORCE_PIO:
2970 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
2972 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
2976 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
2977 snprintf(buf, sizeof(buf), "%s:%s",
2978 ata_mode_string(xfer_mask),
2979 ata_mode_string(xfer_mask & ATA_MASK_PIO));
2981 snprintf(buf, sizeof(buf), "%s",
2982 ata_mode_string(xfer_mask));
2984 ata_dev_printk(dev, KERN_WARNING,
2985 "limiting speed to %s\n", buf);
2988 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2994 static int ata_dev_set_mode(struct ata_device *dev)
2996 struct ata_eh_context *ehc = &dev->link->eh_context;
2997 unsigned int err_mask;
3000 dev->flags &= ~ATA_DFLAG_PIO;
3001 if (dev->xfer_shift == ATA_SHIFT_PIO)
3002 dev->flags |= ATA_DFLAG_PIO;
3004 err_mask = ata_dev_set_xfermode(dev);
3006 /* Old CFA may refuse this command, which is just fine */
3007 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3008 err_mask &= ~AC_ERR_DEV;
3010 /* Some very old devices and some bad newer ones fail any kind of
3011 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
3012 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
3013 dev->pio_mode <= XFER_PIO_2)
3014 err_mask &= ~AC_ERR_DEV;
3016 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3017 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3018 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3019 dev->dma_mode == XFER_MW_DMA_0 &&
3020 (dev->id[63] >> 8) & 1)
3021 err_mask &= ~AC_ERR_DEV;
3024 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3025 "(err_mask=0x%x)\n", err_mask);
3029 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3030 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3031 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3035 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3036 dev->xfer_shift, (int)dev->xfer_mode);
3038 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
3039 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
3044 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3045 * @link: link on which timings will be programmed
3046 * @r_failed_dev: out paramter for failed device
3048 * Standard implementation of the function used to tune and set
3049 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3050 * ata_dev_set_mode() fails, pointer to the failing device is
3051 * returned in @r_failed_dev.
3054 * PCI/etc. bus probe sem.
3057 * 0 on success, negative errno otherwise
3060 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3062 struct ata_port *ap = link->ap;
3063 struct ata_device *dev;
3064 int rc = 0, used_dma = 0, found = 0;
3066 /* step 1: calculate xfer_mask */
3067 ata_link_for_each_dev(dev, link) {
3068 unsigned long pio_mask, dma_mask;
3069 unsigned int mode_mask;
3071 if (!ata_dev_enabled(dev))
3074 mode_mask = ATA_DMA_MASK_ATA;
3075 if (dev->class == ATA_DEV_ATAPI)
3076 mode_mask = ATA_DMA_MASK_ATAPI;
3077 else if (ata_id_is_cfa(dev->id))
3078 mode_mask = ATA_DMA_MASK_CFA;
3080 ata_dev_xfermask(dev);
3082 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3083 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3085 if (libata_dma_mask & mode_mask)
3086 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3090 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3091 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3094 if (dev->dma_mode != 0xff)
3100 /* step 2: always set host PIO timings */
3101 ata_link_for_each_dev(dev, link) {
3102 if (!ata_dev_enabled(dev))
3105 if (dev->pio_mode == 0xff) {
3106 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3111 dev->xfer_mode = dev->pio_mode;
3112 dev->xfer_shift = ATA_SHIFT_PIO;
3113 if (ap->ops->set_piomode)
3114 ap->ops->set_piomode(ap, dev);
3117 /* step 3: set host DMA timings */
3118 ata_link_for_each_dev(dev, link) {
3119 if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3122 dev->xfer_mode = dev->dma_mode;
3123 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3124 if (ap->ops->set_dmamode)
3125 ap->ops->set_dmamode(ap, dev);
3128 /* step 4: update devices' xfer mode */
3129 ata_link_for_each_dev(dev, link) {
3130 /* don't update suspended devices' xfer mode */
3131 if (!ata_dev_enabled(dev))
3134 rc = ata_dev_set_mode(dev);
3139 /* Record simplex status. If we selected DMA then the other
3140 * host channels are not permitted to do so.
3142 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3143 ap->host->simplex_claimed = ap;
3147 *r_failed_dev = dev;
3152 * ata_tf_to_host - issue ATA taskfile to host controller
3153 * @ap: port to which command is being issued
3154 * @tf: ATA taskfile register set
3156 * Issues ATA taskfile register set to ATA host controller,
3157 * with proper synchronization with interrupt handler and
3161 * spin_lock_irqsave(host lock)
3164 static inline void ata_tf_to_host(struct ata_port *ap,
3165 const struct ata_taskfile *tf)
3167 ap->ops->tf_load(ap, tf);
3168 ap->ops->exec_command(ap, tf);
3172 * ata_busy_sleep - sleep until BSY clears, or timeout
3173 * @ap: port containing status register to be polled
3174 * @tmout_pat: impatience timeout
3175 * @tmout: overall timeout
3177 * Sleep until ATA Status register bit BSY clears,
3178 * or a timeout occurs.
3181 * Kernel thread context (may sleep).
3184 * 0 on success, -errno otherwise.
3186 int ata_busy_sleep(struct ata_port *ap,
3187 unsigned long tmout_pat, unsigned long tmout)
3189 unsigned long timer_start, timeout;
3192 status = ata_busy_wait(ap, ATA_BUSY, 300);
3193 timer_start = jiffies;
3194 timeout = timer_start + tmout_pat;
3195 while (status != 0xff && (status & ATA_BUSY) &&
3196 time_before(jiffies, timeout)) {
3198 status = ata_busy_wait(ap, ATA_BUSY, 3);
3201 if (status != 0xff && (status & ATA_BUSY))
3202 ata_port_printk(ap, KERN_WARNING,
3203 "port is slow to respond, please be patient "
3204 "(Status 0x%x)\n", status);
3206 timeout = timer_start + tmout;
3207 while (status != 0xff && (status & ATA_BUSY) &&
3208 time_before(jiffies, timeout)) {
3210 status = ata_chk_status(ap);
3216 if (status & ATA_BUSY) {
3217 ata_port_printk(ap, KERN_ERR, "port failed to respond "
3218 "(%lu secs, Status 0x%x)\n",
3219 tmout / HZ, status);
3227 * ata_wait_after_reset - wait before checking status after reset
3228 * @ap: port containing status register to be polled
3229 * @deadline: deadline jiffies for the operation
3231 * After reset, we need to pause a while before reading status.
3232 * Also, certain combination of controller and device report 0xff
3233 * for some duration (e.g. until SATA PHY is up and running)
3234 * which is interpreted as empty port in ATA world. This
3235 * function also waits for such devices to get out of 0xff
3239 * Kernel thread context (may sleep).
3241 void ata_wait_after_reset(struct ata_port *ap, unsigned long deadline)
3243 unsigned long until = jiffies + ATA_TMOUT_FF_WAIT;
3245 if (time_before(until, deadline))
3248 /* Spec mandates ">= 2ms" before checking status. We wait
3249 * 150ms, because that was the magic delay used for ATAPI
3250 * devices in Hale Landis's ATADRVR, for the period of time
3251 * between when the ATA command register is written, and then
3252 * status is checked. Because waiting for "a while" before
3253 * checking status is fine, post SRST, we perform this magic
3254 * delay here as well.
3256 * Old drivers/ide uses the 2mS rule and then waits for ready.
3260 /* Wait for 0xff to clear. Some SATA devices take a long time
3261 * to clear 0xff after reset. For example, HHD424020F7SV00
3262 * iVDR needs >= 800ms while. Quantum GoVault needs even more
3265 * Note that some PATA controllers (pata_ali) explode if
3266 * status register is read more than once when there's no
3269 if (ap->flags & ATA_FLAG_SATA) {
3271 u8 status = ata_chk_status(ap);
3273 if (status != 0xff || time_after(jiffies, deadline))
3282 * ata_wait_ready - sleep until BSY clears, or timeout
3283 * @ap: port containing status register to be polled
3284 * @deadline: deadline jiffies for the operation
3286 * Sleep until ATA Status register bit BSY clears, or timeout
3290 * Kernel thread context (may sleep).
3293 * 0 on success, -errno otherwise.
3295 int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
3297 unsigned long start = jiffies;
3301 u8 status = ata_chk_status(ap);
3302 unsigned long now = jiffies;
3304 if (!(status & ATA_BUSY))
3306 if (!ata_link_online(&ap->link) && status == 0xff)
3308 if (time_after(now, deadline))
3311 if (!warned && time_after(now, start + 5 * HZ) &&
3312 (deadline - now > 3 * HZ)) {
3313 ata_port_printk(ap, KERN_WARNING,
3314 "port is slow to respond, please be patient "
3315 "(Status 0x%x)\n", status);
3323 static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
3324 unsigned long deadline)
3326 struct ata_ioports *ioaddr = &ap->ioaddr;
3327 unsigned int dev0 = devmask & (1 << 0);
3328 unsigned int dev1 = devmask & (1 << 1);
3331 /* if device 0 was found in ata_devchk, wait for its
3335 rc = ata_wait_ready(ap, deadline);
3343 /* if device 1 was found in ata_devchk, wait for register
3344 * access briefly, then wait for BSY to clear.
3349 ap->ops->dev_select(ap, 1);
3351 /* Wait for register access. Some ATAPI devices fail
3352 * to set nsect/lbal after reset, so don't waste too
3353 * much time on it. We're gonna wait for !BSY anyway.
3355 for (i = 0; i < 2; i++) {
3358 nsect = ioread8(ioaddr->nsect_addr);
3359 lbal = ioread8(ioaddr->lbal_addr);
3360 if ((nsect == 1) && (lbal == 1))
3362 msleep(50); /* give drive a breather */
3365 rc = ata_wait_ready(ap, deadline);
3373 /* is all this really necessary? */
3374 ap->ops->dev_select(ap, 0);
3376 ap->ops->dev_select(ap, 1);
3378 ap->ops->dev_select(ap, 0);
3383 static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
3384 unsigned long deadline)
3386 struct ata_ioports *ioaddr = &ap->ioaddr;
3388 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
3390 /* software reset. causes dev0 to be selected */
3391 iowrite8(ap->ctl, ioaddr->ctl_addr);
3392 udelay(20); /* FIXME: flush */
3393 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
3394 udelay(20); /* FIXME: flush */
3395 iowrite8(ap->ctl, ioaddr->ctl_addr);
3397 /* wait a while before checking status */
3398 ata_wait_after_reset(ap, deadline);
3400 /* Before we perform post reset processing we want to see if
3401 * the bus shows 0xFF because the odd clown forgets the D7
3402 * pulldown resistor.
3404 if (ata_chk_status(ap) == 0xFF)
3407 return ata_bus_post_reset(ap, devmask, deadline);
3411 * ata_bus_reset - reset host port and associated ATA channel
3412 * @ap: port to reset
3414 * This is typically the first time we actually start issuing
3415 * commands to the ATA channel. We wait for BSY to clear, then
3416 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
3417 * result. Determine what devices, if any, are on the channel
3418 * by looking at the device 0/1 error register. Look at the signature
3419 * stored in each device's taskfile registers, to determine if
3420 * the device is ATA or ATAPI.
3423 * PCI/etc. bus probe sem.
3424 * Obtains host lock.
3427 * Sets ATA_FLAG_DISABLED if bus reset fails.
3430 void ata_bus_reset(struct ata_port *ap)
3432 struct ata_device *device = ap->link.device;
3433 struct ata_ioports *ioaddr = &ap->ioaddr;
3434 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3436 unsigned int dev0, dev1 = 0, devmask = 0;
3439 DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
3441 /* determine if device 0/1 are present */
3442 if (ap->flags & ATA_FLAG_SATA_RESET)
3445 dev0 = ata_devchk(ap, 0);
3447 dev1 = ata_devchk(ap, 1);
3451 devmask |= (1 << 0);
3453 devmask |= (1 << 1);
3455 /* select device 0 again */
3456 ap->ops->dev_select(ap, 0);
3458 /* issue bus reset */
3459 if (ap->flags & ATA_FLAG_SRST) {
3460 rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
3461 if (rc && rc != -ENODEV)
3466 * determine by signature whether we have ATA or ATAPI devices
3468 device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
3469 if ((slave_possible) && (err != 0x81))
3470 device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
3472 /* is double-select really necessary? */
3473 if (device[1].class != ATA_DEV_NONE)
3474 ap->ops->dev_select(ap, 1);
3475 if (device[0].class != ATA_DEV_NONE)
3476 ap->ops->dev_select(ap, 0);
3478 /* if no devices were detected, disable this port */
3479 if ((device[0].class == ATA_DEV_NONE) &&
3480 (device[1].class == ATA_DEV_NONE))
3483 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
3484 /* set up device control for ATA_FLAG_SATA_RESET */
3485 iowrite8(ap->ctl, ioaddr->ctl_addr);
3492 ata_port_printk(ap, KERN_ERR, "disabling port\n");
3493 ata_port_disable(ap);
3499 * sata_link_debounce - debounce SATA phy status
3500 * @link: ATA link to debounce SATA phy status for
3501 * @params: timing parameters { interval, duratinon, timeout } in msec
3502 * @deadline: deadline jiffies for the operation
3504 * Make sure SStatus of @link reaches stable state, determined by
3505 * holding the same value where DET is not 1 for @duration polled
3506 * every @interval, before @timeout. Timeout constraints the
3507 * beginning of the stable state. Because DET gets stuck at 1 on
3508 * some controllers after hot unplugging, this functions waits
3509 * until timeout then returns 0 if DET is stable at 1.
3511 * @timeout is further limited by @deadline. The sooner of the
3515 * Kernel thread context (may sleep)
3518 * 0 on success, -errno on failure.
3520 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3521 unsigned long deadline)
3523 unsigned long interval_msec = params[0];
3524 unsigned long duration = msecs_to_jiffies(params[1]);
3525 unsigned long last_jiffies, t;
3529 t = jiffies + msecs_to_jiffies(params[2]);
3530 if (time_before(t, deadline))
3533 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3538 last_jiffies = jiffies;
3541 msleep(interval_msec);
3542 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3548 if (cur == 1 && time_before(jiffies, deadline))
3550 if (time_after(jiffies, last_jiffies + duration))
3555 /* unstable, start over */
3557 last_jiffies = jiffies;
3559 /* Check deadline. If debouncing failed, return
3560 * -EPIPE to tell upper layer to lower link speed.
3562 if (time_after(jiffies, deadline))
3568 * sata_link_resume - resume SATA link
3569 * @link: ATA link to resume SATA
3570 * @params: timing parameters { interval, duratinon, timeout } in msec
3571 * @deadline: deadline jiffies for the operation
3573 * Resume SATA phy @link and debounce it.
3576 * Kernel thread context (may sleep)
3579 * 0 on success, -errno on failure.
3581 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3582 unsigned long deadline)
3587 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3590 scontrol = (scontrol & 0x0f0) | 0x300;
3592 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3595 /* Some PHYs react badly if SStatus is pounded immediately
3596 * after resuming. Delay 200ms before debouncing.
3600 return sata_link_debounce(link, params, deadline);
3604 * ata_std_prereset - prepare for reset
3605 * @link: ATA link to be reset
3606 * @deadline: deadline jiffies for the operation
3608 * @link is about to be reset. Initialize it. Failure from
3609 * prereset makes libata abort whole reset sequence and give up
3610 * that port, so prereset should be best-effort. It does its
3611 * best to prepare for reset sequence but if things go wrong, it
3612 * should just whine, not fail.
3615 * Kernel thread context (may sleep)
3618 * 0 on success, -errno otherwise.
3620 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3622 struct ata_port *ap = link->ap;
3623 struct ata_eh_context *ehc = &link->eh_context;
3624 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3627 /* handle link resume */
3628 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3629 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3630 ehc->i.action |= ATA_EH_HARDRESET;
3632 /* Some PMPs don't work with only SRST, force hardreset if PMP
3635 if (ap->flags & ATA_FLAG_PMP)
3636 ehc->i.action |= ATA_EH_HARDRESET;
3638 /* if we're about to do hardreset, nothing more to do */
3639 if (ehc->i.action & ATA_EH_HARDRESET)
3642 /* if SATA, resume link */
3643 if (ap->flags & ATA_FLAG_SATA) {
3644 rc = sata_link_resume(link, timing, deadline);
3645 /* whine about phy resume failure but proceed */
3646 if (rc && rc != -EOPNOTSUPP)
3647 ata_link_printk(link, KERN_WARNING, "failed to resume "
3648 "link for reset (errno=%d)\n", rc);
3651 /* Wait for !BSY if the controller can wait for the first D2H
3652 * Reg FIS and we don't know that no device is attached.
3654 if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
3655 rc = ata_wait_ready(ap, deadline);
3656 if (rc && rc != -ENODEV) {
3657 ata_link_printk(link, KERN_WARNING, "device not ready "
3658 "(errno=%d), forcing hardreset\n", rc);
3659 ehc->i.action |= ATA_EH_HARDRESET;
3667 * ata_std_softreset - reset host port via ATA SRST
3668 * @link: ATA link to reset
3669 * @classes: resulting classes of attached devices
3670 * @deadline: deadline jiffies for the operation
3672 * Reset host port using ATA SRST.
3675 * Kernel thread context (may sleep)
3678 * 0 on success, -errno otherwise.
3680 int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3681 unsigned long deadline)
3683 struct ata_port *ap = link->ap;
3684 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3685 unsigned int devmask = 0;
3691 if (ata_link_offline(link)) {
3692 classes[0] = ATA_DEV_NONE;
3696 /* determine if device 0/1 are present */
3697 if (ata_devchk(ap, 0))
3698 devmask |= (1 << 0);
3699 if (slave_possible && ata_devchk(ap, 1))
3700 devmask |= (1 << 1);
3702 /* select device 0 again */
3703 ap->ops->dev_select(ap, 0);
3705 /* issue bus reset */
3706 DPRINTK("about to softreset, devmask=%x\n", devmask);
3707 rc = ata_bus_softreset(ap, devmask, deadline);
3708 /* if link is occupied, -ENODEV too is an error */
3709 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
3710 ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3714 /* determine by signature whether we have ATA or ATAPI devices */
3715 classes[0] = ata_dev_try_classify(&link->device[0],
3716 devmask & (1 << 0), &err);
3717 if (slave_possible && err != 0x81)
3718 classes[1] = ata_dev_try_classify(&link->device[1],
3719 devmask & (1 << 1), &err);
3722 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3727 * sata_link_hardreset - reset link via SATA phy reset
3728 * @link: link to reset
3729 * @timing: timing parameters { interval, duratinon, timeout } in msec
3730 * @deadline: deadline jiffies for the operation
3732 * SATA phy-reset @link using DET bits of SControl register.
3735 * Kernel thread context (may sleep)
3738 * 0 on success, -errno otherwise.
3740 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3741 unsigned long deadline)
3748 if (sata_set_spd_needed(link)) {
3749 /* SATA spec says nothing about how to reconfigure
3750 * spd. To be on the safe side, turn off phy during
3751 * reconfiguration. This works for at least ICH7 AHCI
3754 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3757 scontrol = (scontrol & 0x0f0) | 0x304;
3759 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3765 /* issue phy wake/reset */
3766 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3769 scontrol = (scontrol & 0x0f0) | 0x301;
3771 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3774 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3775 * 10.4.2 says at least 1 ms.
3779 /* bring link back */
3780 rc = sata_link_resume(link, timing, deadline);
3782 DPRINTK("EXIT, rc=%d\n", rc);
3787 * sata_std_hardreset - reset host port via SATA phy reset
3788 * @link: link to reset
3789 * @class: resulting class of attached device
3790 * @deadline: deadline jiffies for the operation
3792 * SATA phy-reset host port using DET bits of SControl register,
3793 * wait for !BSY and classify the attached device.
3796 * Kernel thread context (may sleep)
3799 * 0 on success, -errno otherwise.
3801 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3802 unsigned long deadline)
3804 struct ata_port *ap = link->ap;
3805 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3811 rc = sata_link_hardreset(link, timing, deadline);
3813 ata_link_printk(link, KERN_ERR,
3814 "COMRESET failed (errno=%d)\n", rc);
3818 /* TODO: phy layer with polling, timeouts, etc. */
3819 if (ata_link_offline(link)) {
3820 *class = ATA_DEV_NONE;
3821 DPRINTK("EXIT, link offline\n");
3825 /* wait a while before checking status */
3826 ata_wait_after_reset(ap, deadline);
3828 /* If PMP is supported, we have to do follow-up SRST. Note
3829 * that some PMPs don't send D2H Reg FIS after hardreset at
3830 * all if the first port is empty. Wait for it just for a
3831 * second and request follow-up SRST.
3833 if (ap->flags & ATA_FLAG_PMP) {
3834 ata_wait_ready(ap, jiffies + HZ);
3838 rc = ata_wait_ready(ap, deadline);
3839 /* link occupied, -ENODEV too is an error */
3841 ata_link_printk(link, KERN_ERR,
3842 "COMRESET failed (errno=%d)\n", rc);
3846 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3848 *class = ata_dev_try_classify(link->device, 1, NULL);
3850 DPRINTK("EXIT, class=%u\n", *class);
3855 * ata_std_postreset - standard postreset callback
3856 * @link: the target ata_link
3857 * @classes: classes of attached devices
3859 * This function is invoked after a successful reset. Note that
3860 * the device might have been reset more than once using
3861 * different reset methods before postreset is invoked.
3864 * Kernel thread context (may sleep)
3866 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3868 struct ata_port *ap = link->ap;
3873 /* print link status */
3874 sata_print_link_status(link);
3877 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
3878 sata_scr_write(link, SCR_ERROR, serror);
3879 link->eh_info.serror = 0;
3881 /* is double-select really necessary? */
3882 if (classes[0] != ATA_DEV_NONE)
3883 ap->ops->dev_select(ap, 1);
3884 if (classes[1] != ATA_DEV_NONE)
3885 ap->ops->dev_select(ap, 0);
3887 /* bail out if no device is present */
3888 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3889 DPRINTK("EXIT, no device\n");
3893 /* set up device control */
3894 if (ap->ioaddr.ctl_addr)
3895 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3901 * ata_dev_same_device - Determine whether new ID matches configured device
3902 * @dev: device to compare against
3903 * @new_class: class of the new device
3904 * @new_id: IDENTIFY page of the new device
3906 * Compare @new_class and @new_id against @dev and determine
3907 * whether @dev is the device indicated by @new_class and
3914 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3916 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3919 const u16 *old_id = dev->id;
3920 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3921 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3923 if (dev->class != new_class) {
3924 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3925 dev->class, new_class);
3929 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3930 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3931 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3932 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3934 if (strcmp(model[0], model[1])) {
3935 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3936 "'%s' != '%s'\n", model[0], model[1]);
3940 if (strcmp(serial[0], serial[1])) {
3941 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3942 "'%s' != '%s'\n", serial[0], serial[1]);
3950 * ata_dev_reread_id - Re-read IDENTIFY data
3951 * @dev: target ATA device
3952 * @readid_flags: read ID flags
3954 * Re-read IDENTIFY page and make sure @dev is still attached to
3958 * Kernel thread context (may sleep)
3961 * 0 on success, negative errno otherwise
3963 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3965 unsigned int class = dev->class;
3966 u16 *id = (void *)dev->link->ap->sector_buf;
3970 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3974 /* is the device still there? */
3975 if (!ata_dev_same_device(dev, class, id))
3978 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3983 * ata_dev_revalidate - Revalidate ATA device
3984 * @dev: device to revalidate
3985 * @new_class: new class code
3986 * @readid_flags: read ID flags
3988 * Re-read IDENTIFY page, make sure @dev is still attached to the
3989 * port and reconfigure it according to the new IDENTIFY page.
3992 * Kernel thread context (may sleep)
3995 * 0 on success, negative errno otherwise
3997 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
3998 unsigned int readid_flags)
4000 u64 n_sectors = dev->n_sectors;
4003 if (!ata_dev_enabled(dev))
4006 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4007 if (ata_class_enabled(new_class) &&
4008 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
4009 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
4010 dev->class, new_class);
4016 rc = ata_dev_reread_id(dev, readid_flags);
4020 /* configure device according to the new ID */
4021 rc = ata_dev_configure(dev);
4025 /* verify n_sectors hasn't changed */
4026 if (dev->class == ATA_DEV_ATA && n_sectors &&
4027 dev->n_sectors != n_sectors) {
4028 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
4030 (unsigned long long)n_sectors,
4031 (unsigned long long)dev->n_sectors);
4033 /* restore original n_sectors */
4034 dev->n_sectors = n_sectors;
4043 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4047 struct ata_blacklist_entry {
4048 const char *model_num;
4049 const char *model_rev;
4050 unsigned long horkage;
4053 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4054 /* Devices with DMA related problems under Linux */
4055 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
4056 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
4057 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
4058 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
4059 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
4060 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
4061 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
4062 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
4063 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
4064 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
4065 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
4066 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
4067 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
4068 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
4069 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
4070 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
4071 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
4072 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
4073 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
4074 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
4075 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
4076 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
4077 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
4078 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
4079 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
4080 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
4081 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4082 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
4083 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
4084 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
4085 /* Odd clown on sil3726/4726 PMPs */
4086 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
4087 ATA_HORKAGE_SKIP_PM },
4089 /* Weird ATAPI devices */
4090 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
4092 /* Devices we expect to fail diagnostics */
4094 /* Devices where NCQ should be avoided */
4096 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
4097 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
4098 /* http://thread.gmane.org/gmane.linux.ide/14907 */
4099 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
4101 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
4102 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
4103 { "HITACHI HDS7250SASUN500G*", NULL, ATA_HORKAGE_NONCQ },
4104 { "HITACHI HDS7225SBSUN250G*", NULL, ATA_HORKAGE_NONCQ },
4105 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
4106 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
4108 /* Blacklist entries taken from Silicon Image 3124/3132
4109 Windows driver .inf file - also several Linux problem reports */
4110 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
4111 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
4112 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
4114 /* devices which puke on READ_NATIVE_MAX */
4115 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
4116 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4117 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4118 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
4120 /* Devices which report 1 sector over size HPA */
4121 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
4122 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
4124 /* Devices which get the IVB wrong */
4125 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4126 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
4127 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
4128 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
4129 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
4135 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4141 * check for trailing wildcard: *\0
4143 p = strchr(patt, wildchar);
4144 if (p && ((*(p + 1)) == 0))
4155 return strncmp(patt, name, len);
4158 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4160 unsigned char model_num[ATA_ID_PROD_LEN + 1];
4161 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4162 const struct ata_blacklist_entry *ad = ata_device_blacklist;
4164 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4165 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4167 while (ad->model_num) {
4168 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4169 if (ad->model_rev == NULL)
4171 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4179 static int ata_dma_blacklisted(const struct ata_device *dev)
4181 /* We don't support polling DMA.
4182 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4183 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4185 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4186 (dev->flags & ATA_DFLAG_CDB_INTR))
4188 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4192 * ata_is_40wire - check drive side detection
4195 * Perform drive side detection decoding, allowing for device vendors
4196 * who can't follow the documentation.
4199 static int ata_is_40wire(struct ata_device *dev)
4201 if (dev->horkage & ATA_HORKAGE_IVB)
4202 return ata_drive_40wire_relaxed(dev->id);
4203 return ata_drive_40wire(dev->id);
4207 * ata_dev_xfermask - Compute supported xfermask of the given device
4208 * @dev: Device to compute xfermask for
4210 * Compute supported xfermask of @dev and store it in
4211 * dev->*_mask. This function is responsible for applying all
4212 * known limits including host controller limits, device
4218 static void ata_dev_xfermask(struct ata_device *dev)
4220 struct ata_link *link = dev->link;
4221 struct ata_port *ap = link->ap;
4222 struct ata_host *host = ap->host;
4223 unsigned long xfer_mask;
4225 /* controller modes available */
4226 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4227 ap->mwdma_mask, ap->udma_mask);
4229 /* drive modes available */
4230 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4231 dev->mwdma_mask, dev->udma_mask);
4232 xfer_mask &= ata_id_xfermask(dev->id);
4235 * CFA Advanced TrueIDE timings are not allowed on a shared
4238 if (ata_dev_pair(dev)) {
4239 /* No PIO5 or PIO6 */
4240 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4241 /* No MWDMA3 or MWDMA 4 */
4242 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4245 if (ata_dma_blacklisted(dev)) {
4246 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4247 ata_dev_printk(dev, KERN_WARNING,
4248 "device is on DMA blacklist, disabling DMA\n");
4251 if ((host->flags & ATA_HOST_SIMPLEX) &&
4252 host->simplex_claimed && host->simplex_claimed != ap) {
4253 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4254 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4255 "other device, disabling DMA\n");
4258 if (ap->flags & ATA_FLAG_NO_IORDY)
4259 xfer_mask &= ata_pio_mask_no_iordy(dev);
4261 if (ap->ops->mode_filter)
4262 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4264 /* Apply cable rule here. Don't apply it early because when
4265 * we handle hot plug the cable type can itself change.
4266 * Check this last so that we know if the transfer rate was
4267 * solely limited by the cable.
4268 * Unknown or 80 wire cables reported host side are checked
4269 * drive side as well. Cases where we know a 40wire cable
4270 * is used safely for 80 are not checked here.
4272 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4273 /* UDMA/44 or higher would be available */
4274 if ((ap->cbl == ATA_CBL_PATA40) ||
4275 (ata_is_40wire(dev) &&
4276 (ap->cbl == ATA_CBL_PATA_UNK ||
4277 ap->cbl == ATA_CBL_PATA80))) {
4278 ata_dev_printk(dev, KERN_WARNING,
4279 "limited to UDMA/33 due to 40-wire cable\n");
4280 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4283 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4284 &dev->mwdma_mask, &dev->udma_mask);
4288 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4289 * @dev: Device to which command will be sent
4291 * Issue SET FEATURES - XFER MODE command to device @dev
4295 * PCI/etc. bus probe sem.
4298 * 0 on success, AC_ERR_* mask otherwise.
4301 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4303 struct ata_taskfile tf;
4304 unsigned int err_mask;
4306 /* set up set-features taskfile */
4307 DPRINTK("set features - xfer mode\n");
4309 /* Some controllers and ATAPI devices show flaky interrupt
4310 * behavior after setting xfer mode. Use polling instead.
4312 ata_tf_init(dev, &tf);
4313 tf.command = ATA_CMD_SET_FEATURES;
4314 tf.feature = SETFEATURES_XFER;
4315 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4316 tf.protocol = ATA_PROT_NODATA;
4317 /* If we are using IORDY we must send the mode setting command */
4318 if (ata_pio_need_iordy(dev))
4319 tf.nsect = dev->xfer_mode;
4320 /* If the device has IORDY and the controller does not - turn it off */
4321 else if (ata_id_has_iordy(dev->id))
4323 else /* In the ancient relic department - skip all of this */
4326 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4328 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4332 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4333 * @dev: Device to which command will be sent
4334 * @enable: Whether to enable or disable the feature
4335 * @feature: The sector count represents the feature to set
4337 * Issue SET FEATURES - SATA FEATURES command to device @dev
4338 * on port @ap with sector count
4341 * PCI/etc. bus probe sem.
4344 * 0 on success, AC_ERR_* mask otherwise.
4346 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4349 struct ata_taskfile tf;
4350 unsigned int err_mask;
4352 /* set up set-features taskfile */
4353 DPRINTK("set features - SATA features\n");
4355 ata_tf_init(dev, &tf);
4356 tf.command = ATA_CMD_SET_FEATURES;
4357 tf.feature = enable;
4358 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4359 tf.protocol = ATA_PROT_NODATA;
4362 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4364 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4369 * ata_dev_init_params - Issue INIT DEV PARAMS command
4370 * @dev: Device to which command will be sent
4371 * @heads: Number of heads (taskfile parameter)
4372 * @sectors: Number of sectors (taskfile parameter)
4375 * Kernel thread context (may sleep)
4378 * 0 on success, AC_ERR_* mask otherwise.
4380 static unsigned int ata_dev_init_params(struct ata_device *dev,
4381 u16 heads, u16 sectors)
4383 struct ata_taskfile tf;
4384 unsigned int err_mask;
4386 /* Number of sectors per track 1-255. Number of heads 1-16 */
4387 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4388 return AC_ERR_INVALID;
4390 /* set up init dev params taskfile */
4391 DPRINTK("init dev params \n");
4393 ata_tf_init(dev, &tf);
4394 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4395 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4396 tf.protocol = ATA_PROT_NODATA;
4398 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4400 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4401 /* A clean abort indicates an original or just out of spec drive
4402 and we should continue as we issue the setup based on the
4403 drive reported working geometry */
4404 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4407 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4412 * ata_sg_clean - Unmap DMA memory associated with command
4413 * @qc: Command containing DMA memory to be released
4415 * Unmap all mapped DMA memory associated with this command.
4418 * spin_lock_irqsave(host lock)
4420 void ata_sg_clean(struct ata_queued_cmd *qc)
4422 struct ata_port *ap = qc->ap;
4423 struct scatterlist *sg = qc->__sg;
4424 int dir = qc->dma_dir;
4425 void *pad_buf = NULL;
4427 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
4428 WARN_ON(sg == NULL);
4430 if (qc->flags & ATA_QCFLAG_SINGLE)
4431 WARN_ON(qc->n_elem > 1);
4433 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4435 /* if we padded the buffer out to 32-bit bound, and data
4436 * xfer direction is from-device, we must copy from the
4437 * pad buffer back into the supplied buffer
4439 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
4440 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4442 if (qc->flags & ATA_QCFLAG_SG) {
4444 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4445 /* restore last sg */
4446 sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
4448 struct scatterlist *psg = &qc->pad_sgent;
4449 void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4450 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4451 kunmap_atomic(addr, KM_IRQ0);
4455 dma_unmap_single(ap->dev,
4456 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
4459 sg->length += qc->pad_len;
4461 memcpy(qc->buf_virt + sg->length - qc->pad_len,
4462 pad_buf, qc->pad_len);
4465 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4470 * ata_fill_sg - Fill PCI IDE PRD table
4471 * @qc: Metadata associated with taskfile to be transferred
4473 * Fill PCI IDE PRD (scatter-gather) table with segments
4474 * associated with the current disk command.
4477 * spin_lock_irqsave(host lock)
4480 static void ata_fill_sg(struct ata_queued_cmd *qc)
4482 struct ata_port *ap = qc->ap;
4483 struct scatterlist *sg;
4486 WARN_ON(qc->__sg == NULL);
4487 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4490 ata_for_each_sg(sg, qc) {
4494 /* determine if physical DMA addr spans 64K boundary.
4495 * Note h/w doesn't support 64-bit, so we unconditionally
4496 * truncate dma_addr_t to u32.
4498 addr = (u32) sg_dma_address(sg);
4499 sg_len = sg_dma_len(sg);
4502 offset = addr & 0xffff;
4504 if ((offset + sg_len) > 0x10000)
4505 len = 0x10000 - offset;
4507 ap->prd[idx].addr = cpu_to_le32(addr);
4508 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
4509 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4518 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4522 * ata_fill_sg_dumb - Fill PCI IDE PRD table
4523 * @qc: Metadata associated with taskfile to be transferred
4525 * Fill PCI IDE PRD (scatter-gather) table with segments
4526 * associated with the current disk command. Perform the fill
4527 * so that we avoid writing any length 64K records for
4528 * controllers that don't follow the spec.
4531 * spin_lock_irqsave(host lock)
4534 static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
4536 struct ata_port *ap = qc->ap;
4537 struct scatterlist *sg;
4540 WARN_ON(qc->__sg == NULL);
4541 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4544 ata_for_each_sg(sg, qc) {
4546 u32 sg_len, len, blen;
4548 /* determine if physical DMA addr spans 64K boundary.
4549 * Note h/w doesn't support 64-bit, so we unconditionally
4550 * truncate dma_addr_t to u32.
4552 addr = (u32) sg_dma_address(sg);
4553 sg_len = sg_dma_len(sg);
4556 offset = addr & 0xffff;
4558 if ((offset + sg_len) > 0x10000)
4559 len = 0x10000 - offset;
4561 blen = len & 0xffff;
4562 ap->prd[idx].addr = cpu_to_le32(addr);
4564 /* Some PATA chipsets like the CS5530 can't
4565 cope with 0x0000 meaning 64K as the spec says */
4566 ap->prd[idx].flags_len = cpu_to_le32(0x8000);
4568 ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
4570 ap->prd[idx].flags_len = cpu_to_le32(blen);
4571 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4580 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4584 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4585 * @qc: Metadata associated with taskfile to check
4587 * Allow low-level driver to filter ATA PACKET commands, returning
4588 * a status indicating whether or not it is OK to use DMA for the
4589 * supplied PACKET command.
4592 * spin_lock_irqsave(host lock)
4594 * RETURNS: 0 when ATAPI DMA can be used
4597 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4599 struct ata_port *ap = qc->ap;
4601 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4602 * few ATAPI devices choke on such DMA requests.
4604 if (unlikely(qc->nbytes & 15))
4607 if (ap->ops->check_atapi_dma)
4608 return ap->ops->check_atapi_dma(qc);
4614 * atapi_qc_may_overflow - Check whether data transfer may overflow
4615 * @qc: ATA command in question
4617 * ATAPI commands which transfer variable length data to host
4618 * might overflow due to application error or hardare bug. This
4619 * function checks whether overflow should be drained and ignored
4626 * 1 if @qc may overflow; otherwise, 0.
4628 static int atapi_qc_may_overflow(struct ata_queued_cmd *qc)
4630 if (qc->tf.protocol != ATA_PROT_ATAPI &&
4631 qc->tf.protocol != ATA_PROT_ATAPI_DMA)
4634 if (qc->tf.flags & ATA_TFLAG_WRITE)
4637 switch (qc->cdb[0]) {
4643 case GPCMD_READ_CD_MSF:
4651 * ata_std_qc_defer - Check whether a qc needs to be deferred
4652 * @qc: ATA command in question
4654 * Non-NCQ commands cannot run with any other command, NCQ or
4655 * not. As upper layer only knows the queue depth, we are
4656 * responsible for maintaining exclusion. This function checks
4657 * whether a new command @qc can be issued.
4660 * spin_lock_irqsave(host lock)
4663 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4665 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4667 struct ata_link *link = qc->dev->link;
4669 if (qc->tf.protocol == ATA_PROT_NCQ) {
4670 if (!ata_tag_valid(link->active_tag))
4673 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4677 return ATA_DEFER_LINK;
4681 * ata_qc_prep - Prepare taskfile for submission
4682 * @qc: Metadata associated with taskfile to be prepared
4684 * Prepare ATA taskfile for submission.
4687 * spin_lock_irqsave(host lock)
4689 void ata_qc_prep(struct ata_queued_cmd *qc)
4691 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4698 * ata_dumb_qc_prep - Prepare taskfile for submission
4699 * @qc: Metadata associated with taskfile to be prepared
4701 * Prepare ATA taskfile for submission.
4704 * spin_lock_irqsave(host lock)
4706 void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
4708 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4711 ata_fill_sg_dumb(qc);
4714 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4717 * ata_sg_init_one - Associate command with memory buffer
4718 * @qc: Command to be associated
4719 * @buf: Memory buffer
4720 * @buflen: Length of memory buffer, in bytes.
4722 * Initialize the data-related elements of queued_cmd @qc
4723 * to point to a single memory buffer, @buf of byte length @buflen.
4726 * spin_lock_irqsave(host lock)
4729 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
4731 qc->flags |= ATA_QCFLAG_SINGLE;
4733 qc->__sg = &qc->sgent;
4735 qc->orig_n_elem = 1;
4737 qc->nbytes = buflen;
4738 qc->cursg = qc->__sg;
4740 sg_init_one(&qc->sgent, buf, buflen);
4744 * ata_sg_init - Associate command with scatter-gather table.
4745 * @qc: Command to be associated
4746 * @sg: Scatter-gather table.
4747 * @n_elem: Number of elements in s/g table.
4749 * Initialize the data-related elements of queued_cmd @qc
4750 * to point to a scatter-gather table @sg, containing @n_elem
4754 * spin_lock_irqsave(host lock)
4757 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4758 unsigned int n_elem)
4760 qc->flags |= ATA_QCFLAG_SG;
4762 qc->n_elem = n_elem;
4763 qc->orig_n_elem = n_elem;
4764 qc->cursg = qc->__sg;
4768 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
4769 * @qc: Command with memory buffer to be mapped.
4771 * DMA-map the memory buffer associated with queued_cmd @qc.
4774 * spin_lock_irqsave(host lock)
4777 * Zero on success, negative on error.
4780 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
4782 struct ata_port *ap = qc->ap;
4783 int dir = qc->dma_dir;
4784 struct scatterlist *sg = qc->__sg;
4785 dma_addr_t dma_address;
4788 /* we must lengthen transfers to end on a 32-bit boundary */
4789 qc->pad_len = sg->length & 3;
4791 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4792 struct scatterlist *psg = &qc->pad_sgent;
4794 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4796 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4798 if (qc->tf.flags & ATA_TFLAG_WRITE)
4799 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
4802 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4803 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4805 sg->length -= qc->pad_len;
4806 if (sg->length == 0)
4809 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
4810 sg->length, qc->pad_len);
4818 dma_address = dma_map_single(ap->dev, qc->buf_virt,
4820 if (dma_mapping_error(dma_address)) {
4822 sg->length += qc->pad_len;
4826 sg_dma_address(sg) = dma_address;
4827 sg_dma_len(sg) = sg->length;
4830 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
4831 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4837 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4838 * @qc: Command with scatter-gather table to be mapped.
4840 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4843 * spin_lock_irqsave(host lock)
4846 * Zero on success, negative on error.
4850 static int ata_sg_setup(struct ata_queued_cmd *qc)
4852 struct ata_port *ap = qc->ap;
4853 struct scatterlist *sg = qc->__sg;
4854 struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
4855 int n_elem, pre_n_elem, dir, trim_sg = 0;
4857 VPRINTK("ENTER, ata%u\n", ap->print_id);
4858 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
4860 /* we must lengthen transfers to end on a 32-bit boundary */
4861 qc->pad_len = lsg->length & 3;
4863 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4864 struct scatterlist *psg = &qc->pad_sgent;
4865 unsigned int offset;
4867 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4869 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4872 * psg->page/offset are used to copy to-be-written
4873 * data in this function or read data in ata_sg_clean.
4875 offset = lsg->offset + lsg->length - qc->pad_len;
4876 sg_init_table(psg, 1);
4877 sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT),
4878 qc->pad_len, offset_in_page(offset));
4880 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4881 void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4882 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4883 kunmap_atomic(addr, KM_IRQ0);
4886 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4887 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4889 lsg->length -= qc->pad_len;
4890 if (lsg->length == 0)
4893 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
4894 qc->n_elem - 1, lsg->length, qc->pad_len);
4897 pre_n_elem = qc->n_elem;
4898 if (trim_sg && pre_n_elem)
4907 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4909 /* restore last sg */
4910 lsg->length += qc->pad_len;
4914 DPRINTK("%d sg elements mapped\n", n_elem);
4917 qc->n_elem = n_elem;
4923 * swap_buf_le16 - swap halves of 16-bit words in place
4924 * @buf: Buffer to swap
4925 * @buf_words: Number of 16-bit words in buffer.
4927 * Swap halves of 16-bit words if needed to convert from
4928 * little-endian byte order to native cpu byte order, or
4932 * Inherited from caller.
4934 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4939 for (i = 0; i < buf_words; i++)
4940 buf[i] = le16_to_cpu(buf[i]);
4941 #endif /* __BIG_ENDIAN */
4945 * ata_data_xfer - Transfer data by PIO
4946 * @adev: device to target
4948 * @buflen: buffer length
4949 * @write_data: read/write
4951 * Transfer data from/to the device data register by PIO.
4954 * Inherited from caller.
4956 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
4957 unsigned int buflen, int write_data)
4959 struct ata_port *ap = adev->link->ap;
4960 unsigned int words = buflen >> 1;
4962 /* Transfer multiple of 2 bytes */
4964 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
4966 ioread16_rep(ap->ioaddr.data_addr, buf, words);
4968 /* Transfer trailing 1 byte, if any. */
4969 if (unlikely(buflen & 0x01)) {
4970 u16 align_buf[1] = { 0 };
4971 unsigned char *trailing_buf = buf + buflen - 1;
4974 memcpy(align_buf, trailing_buf, 1);
4975 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
4977 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
4978 memcpy(trailing_buf, align_buf, 1);
4984 * ata_data_xfer_noirq - Transfer data by PIO
4985 * @adev: device to target
4987 * @buflen: buffer length
4988 * @write_data: read/write
4990 * Transfer data from/to the device data register by PIO. Do the
4991 * transfer with interrupts disabled.
4994 * Inherited from caller.
4996 void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
4997 unsigned int buflen, int write_data)
4999 unsigned long flags;
5000 local_irq_save(flags);
5001 ata_data_xfer(adev, buf, buflen, write_data);
5002 local_irq_restore(flags);
5007 * ata_pio_sector - Transfer a sector of data.
5008 * @qc: Command on going
5010 * Transfer qc->sect_size bytes of data from/to the ATA device.
5013 * Inherited from caller.
5016 static void ata_pio_sector(struct ata_queued_cmd *qc)
5018 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5019 struct ata_port *ap = qc->ap;
5021 unsigned int offset;
5024 if (qc->curbytes == qc->nbytes - qc->sect_size)
5025 ap->hsm_task_state = HSM_ST_LAST;
5027 page = sg_page(qc->cursg);
5028 offset = qc->cursg->offset + qc->cursg_ofs;
5030 /* get the current page and offset */
5031 page = nth_page(page, (offset >> PAGE_SHIFT));
5032 offset %= PAGE_SIZE;
5034 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
5036 if (PageHighMem(page)) {
5037 unsigned long flags;
5039 /* FIXME: use a bounce buffer */
5040 local_irq_save(flags);
5041 buf = kmap_atomic(page, KM_IRQ0);
5043 /* do the actual data transfer */
5044 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5046 kunmap_atomic(buf, KM_IRQ0);
5047 local_irq_restore(flags);
5049 buf = page_address(page);
5050 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5053 qc->curbytes += qc->sect_size;
5054 qc->cursg_ofs += qc->sect_size;
5056 if (qc->cursg_ofs == qc->cursg->length) {
5057 qc->cursg = sg_next(qc->cursg);
5063 * ata_pio_sectors - Transfer one or many sectors.
5064 * @qc: Command on going
5066 * Transfer one or many sectors of data from/to the
5067 * ATA device for the DRQ request.
5070 * Inherited from caller.
5073 static void ata_pio_sectors(struct ata_queued_cmd *qc)
5075 if (is_multi_taskfile(&qc->tf)) {
5076 /* READ/WRITE MULTIPLE */
5079 WARN_ON(qc->dev->multi_count == 0);
5081 nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
5082 qc->dev->multi_count);
5088 ata_altstatus(qc->ap); /* flush */
5092 * atapi_send_cdb - Write CDB bytes to hardware
5093 * @ap: Port to which ATAPI device is attached.
5094 * @qc: Taskfile currently active
5096 * When device has indicated its readiness to accept
5097 * a CDB, this function is called. Send the CDB.
5103 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
5106 DPRINTK("send cdb\n");
5107 WARN_ON(qc->dev->cdb_len < 12);
5109 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
5110 ata_altstatus(ap); /* flush */
5112 switch (qc->tf.protocol) {
5113 case ATA_PROT_ATAPI:
5114 ap->hsm_task_state = HSM_ST;
5116 case ATA_PROT_ATAPI_NODATA:
5117 ap->hsm_task_state = HSM_ST_LAST;
5119 case ATA_PROT_ATAPI_DMA:
5120 ap->hsm_task_state = HSM_ST_LAST;
5121 /* initiate bmdma */
5122 ap->ops->bmdma_start(qc);
5128 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
5129 * @qc: Command on going
5130 * @bytes: number of bytes
5132 * Transfer Transfer data from/to the ATAPI device.
5135 * Inherited from caller.
5138 static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
5140 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5141 struct ata_port *ap = qc->ap;
5142 struct ata_eh_info *ehi = &qc->dev->link->eh_info;
5143 struct scatterlist *sg;
5146 unsigned int offset, count;
5150 if (unlikely(!sg)) {
5152 * The end of qc->sg is reached and the device expects
5153 * more data to transfer. In order not to overrun qc->sg
5154 * and fulfill length specified in the byte count register,
5155 * - for read case, discard trailing data from the device
5156 * - for write case, padding zero data to the device
5158 u16 pad_buf[1] = { 0 };
5161 if (bytes > qc->curbytes - qc->nbytes + ATAPI_MAX_DRAIN) {
5162 ata_ehi_push_desc(ehi, "too much trailing data "
5163 "buf=%u cur=%u bytes=%u",
5164 qc->nbytes, qc->curbytes, bytes);
5168 /* overflow is exptected for misc ATAPI commands */
5169 if (bytes && !atapi_qc_may_overflow(qc))
5170 ata_dev_printk(qc->dev, KERN_WARNING, "ATAPI %u bytes "
5171 "trailing data (cdb=%02x nbytes=%u)\n",
5172 bytes, qc->cdb[0], qc->nbytes);
5174 for (i = 0; i < (bytes + 1) / 2; i++)
5175 ap->ops->data_xfer(qc->dev, (unsigned char *)pad_buf, 2, do_write);
5177 qc->curbytes += bytes;
5183 offset = sg->offset + qc->cursg_ofs;
5185 /* get the current page and offset */
5186 page = nth_page(page, (offset >> PAGE_SHIFT));
5187 offset %= PAGE_SIZE;
5189 /* don't overrun current sg */
5190 count = min(sg->length - qc->cursg_ofs, bytes);
5192 /* don't cross page boundaries */
5193 count = min(count, (unsigned int)PAGE_SIZE - offset);
5195 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
5197 if (PageHighMem(page)) {
5198 unsigned long flags;
5200 /* FIXME: use bounce buffer */
5201 local_irq_save(flags);
5202 buf = kmap_atomic(page, KM_IRQ0);
5204 /* do the actual data transfer */
5205 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
5207 kunmap_atomic(buf, KM_IRQ0);
5208 local_irq_restore(flags);
5210 buf = page_address(page);
5211 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
5215 if ((count & 1) && bytes)
5217 qc->curbytes += count;
5218 qc->cursg_ofs += count;
5220 if (qc->cursg_ofs == sg->length) {
5221 qc->cursg = sg_next(qc->cursg);
5232 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
5233 * @qc: Command on going
5235 * Transfer Transfer data from/to the ATAPI device.
5238 * Inherited from caller.
5241 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
5243 struct ata_port *ap = qc->ap;
5244 struct ata_device *dev = qc->dev;
5245 unsigned int ireason, bc_lo, bc_hi, bytes;
5246 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
5248 /* Abuse qc->result_tf for temp storage of intermediate TF
5249 * here to save some kernel stack usage.
5250 * For normal completion, qc->result_tf is not relevant. For
5251 * error, qc->result_tf is later overwritten by ata_qc_complete().
5252 * So, the correctness of qc->result_tf is not affected.
5254 ap->ops->tf_read(ap, &qc->result_tf);
5255 ireason = qc->result_tf.nsect;
5256 bc_lo = qc->result_tf.lbam;
5257 bc_hi = qc->result_tf.lbah;
5258 bytes = (bc_hi << 8) | bc_lo;
5260 /* shall be cleared to zero, indicating xfer of data */
5261 if (ireason & (1 << 0))
5264 /* make sure transfer direction matches expected */
5265 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
5266 if (do_write != i_write)
5269 VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5271 if (__atapi_pio_bytes(qc, bytes))
5273 ata_altstatus(ap); /* flush */
5278 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5279 qc->err_mask |= AC_ERR_HSM;
5280 ap->hsm_task_state = HSM_ST_ERR;
5284 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
5285 * @ap: the target ata_port
5289 * 1 if ok in workqueue, 0 otherwise.
5292 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
5294 if (qc->tf.flags & ATA_TFLAG_POLLING)
5297 if (ap->hsm_task_state == HSM_ST_FIRST) {
5298 if (qc->tf.protocol == ATA_PROT_PIO &&
5299 (qc->tf.flags & ATA_TFLAG_WRITE))
5302 if (ata_is_atapi(qc->tf.protocol) &&
5303 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5311 * ata_hsm_qc_complete - finish a qc running on standard HSM
5312 * @qc: Command to complete
5313 * @in_wq: 1 if called from workqueue, 0 otherwise
5315 * Finish @qc which is running on standard HSM.
5318 * If @in_wq is zero, spin_lock_irqsave(host lock).
5319 * Otherwise, none on entry and grabs host lock.
5321 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
5323 struct ata_port *ap = qc->ap;
5324 unsigned long flags;
5326 if (ap->ops->error_handler) {
5328 spin_lock_irqsave(ap->lock, flags);
5330 /* EH might have kicked in while host lock is
5333 qc = ata_qc_from_tag(ap, qc->tag);
5335 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5336 ap->ops->irq_on(ap);
5337 ata_qc_complete(qc);
5339 ata_port_freeze(ap);
5342 spin_unlock_irqrestore(ap->lock, flags);
5344 if (likely(!(qc->err_mask & AC_ERR_HSM)))
5345 ata_qc_complete(qc);
5347 ata_port_freeze(ap);
5351 spin_lock_irqsave(ap->lock, flags);
5352 ap->ops->irq_on(ap);
5353 ata_qc_complete(qc);
5354 spin_unlock_irqrestore(ap->lock, flags);
5356 ata_qc_complete(qc);
5361 * ata_hsm_move - move the HSM to the next state.
5362 * @ap: the target ata_port
5364 * @status: current device status
5365 * @in_wq: 1 if called from workqueue, 0 otherwise
5368 * 1 when poll next status needed, 0 otherwise.
5370 int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
5371 u8 status, int in_wq)
5373 unsigned long flags = 0;
5376 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
5378 /* Make sure ata_qc_issue_prot() does not throw things
5379 * like DMA polling into the workqueue. Notice that
5380 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
5382 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5385 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
5386 ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5388 switch (ap->hsm_task_state) {
5390 /* Send first data block or PACKET CDB */
5392 /* If polling, we will stay in the work queue after
5393 * sending the data. Otherwise, interrupt handler
5394 * takes over after sending the data.
5396 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
5398 /* check device status */
5399 if (unlikely((status & ATA_DRQ) == 0)) {
5400 /* handle BSY=0, DRQ=0 as error */
5401 if (likely(status & (ATA_ERR | ATA_DF)))
5402 /* device stops HSM for abort/error */
5403 qc->err_mask |= AC_ERR_DEV;
5405 /* HSM violation. Let EH handle this */
5406 qc->err_mask |= AC_ERR_HSM;
5408 ap->hsm_task_state = HSM_ST_ERR;
5412 /* Device should not ask for data transfer (DRQ=1)
5413 * when it finds something wrong.
5414 * We ignore DRQ here and stop the HSM by
5415 * changing hsm_task_state to HSM_ST_ERR and
5416 * let the EH abort the command or reset the device.
5418 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5419 /* Some ATAPI tape drives forget to clear the ERR bit
5420 * when doing the next command (mostly request sense).
5421 * We ignore ERR here to workaround and proceed sending
5424 if (!(qc->dev->horkage & ATA_HORKAGE_STUCK_ERR)) {
5425 ata_port_printk(ap, KERN_WARNING,
5426 "DRQ=1 with device error, "
5427 "dev_stat 0x%X\n", status);
5428 qc->err_mask |= AC_ERR_HSM;
5429 ap->hsm_task_state = HSM_ST_ERR;
5434 /* Send the CDB (atapi) or the first data block (ata pio out).
5435 * During the state transition, interrupt handler shouldn't
5436 * be invoked before the data transfer is complete and
5437 * hsm_task_state is changed. Hence, the following locking.
5440 spin_lock_irqsave(ap->lock, flags);
5442 if (qc->tf.protocol == ATA_PROT_PIO) {
5443 /* PIO data out protocol.
5444 * send first data block.
5447 /* ata_pio_sectors() might change the state
5448 * to HSM_ST_LAST. so, the state is changed here
5449 * before ata_pio_sectors().
5451 ap->hsm_task_state = HSM_ST;
5452 ata_pio_sectors(qc);
5455 atapi_send_cdb(ap, qc);
5458 spin_unlock_irqrestore(ap->lock, flags);
5460 /* if polling, ata_pio_task() handles the rest.
5461 * otherwise, interrupt handler takes over from here.
5466 /* complete command or read/write the data register */
5467 if (qc->tf.protocol == ATA_PROT_ATAPI) {
5468 /* ATAPI PIO protocol */
5469 if ((status & ATA_DRQ) == 0) {
5470 /* No more data to transfer or device error.
5471 * Device error will be tagged in HSM_ST_LAST.
5473 ap->hsm_task_state = HSM_ST_LAST;
5477 /* Device should not ask for data transfer (DRQ=1)
5478 * when it finds something wrong.
5479 * We ignore DRQ here and stop the HSM by
5480 * changing hsm_task_state to HSM_ST_ERR and
5481 * let the EH abort the command or reset the device.
5483 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5484 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
5485 "device error, dev_stat 0x%X\n",
5487 qc->err_mask |= AC_ERR_HSM;
5488 ap->hsm_task_state = HSM_ST_ERR;
5492 atapi_pio_bytes(qc);
5494 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
5495 /* bad ireason reported by device */
5499 /* ATA PIO protocol */
5500 if (unlikely((status & ATA_DRQ) == 0)) {
5501 /* handle BSY=0, DRQ=0 as error */
5502 if (likely(status & (ATA_ERR | ATA_DF)))
5503 /* device stops HSM for abort/error */
5504 qc->err_mask |= AC_ERR_DEV;
5506 /* HSM violation. Let EH handle this.
5507 * Phantom devices also trigger this
5508 * condition. Mark hint.
5510 qc->err_mask |= AC_ERR_HSM |
5513 ap->hsm_task_state = HSM_ST_ERR;
5517 /* For PIO reads, some devices may ask for
5518 * data transfer (DRQ=1) alone with ERR=1.
5519 * We respect DRQ here and transfer one
5520 * block of junk data before changing the
5521 * hsm_task_state to HSM_ST_ERR.
5523 * For PIO writes, ERR=1 DRQ=1 doesn't make
5524 * sense since the data block has been
5525 * transferred to the device.
5527 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5528 /* data might be corrputed */
5529 qc->err_mask |= AC_ERR_DEV;
5531 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
5532 ata_pio_sectors(qc);
5533 status = ata_wait_idle(ap);
5536 if (status & (ATA_BUSY | ATA_DRQ))
5537 qc->err_mask |= AC_ERR_HSM;
5539 /* ata_pio_sectors() might change the
5540 * state to HSM_ST_LAST. so, the state
5541 * is changed after ata_pio_sectors().
5543 ap->hsm_task_state = HSM_ST_ERR;
5547 ata_pio_sectors(qc);
5549 if (ap->hsm_task_state == HSM_ST_LAST &&
5550 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
5552 status = ata_wait_idle(ap);
5561 if (unlikely(!ata_ok(status))) {
5562 qc->err_mask |= __ac_err_mask(status);
5563 ap->hsm_task_state = HSM_ST_ERR;
5567 /* no more data to transfer */
5568 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
5569 ap->print_id, qc->dev->devno, status);
5571 WARN_ON(qc->err_mask);
5573 ap->hsm_task_state = HSM_ST_IDLE;
5575 /* complete taskfile transaction */
5576 ata_hsm_qc_complete(qc, in_wq);
5582 /* make sure qc->err_mask is available to
5583 * know what's wrong and recover
5585 WARN_ON(qc->err_mask == 0);
5587 ap->hsm_task_state = HSM_ST_IDLE;
5589 /* complete taskfile transaction */
5590 ata_hsm_qc_complete(qc, in_wq);
5602 static void ata_pio_task(struct work_struct *work)
5604 struct ata_port *ap =
5605 container_of(work, struct ata_port, port_task.work);
5606 struct ata_queued_cmd *qc = ap->port_task_data;
5611 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5614 * This is purely heuristic. This is a fast path.
5615 * Sometimes when we enter, BSY will be cleared in
5616 * a chk-status or two. If not, the drive is probably seeking
5617 * or something. Snooze for a couple msecs, then
5618 * chk-status again. If still busy, queue delayed work.
5620 status = ata_busy_wait(ap, ATA_BUSY, 5);
5621 if (status & ATA_BUSY) {
5623 status = ata_busy_wait(ap, ATA_BUSY, 10);
5624 if (status & ATA_BUSY) {
5625 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5631 poll_next = ata_hsm_move(ap, qc, status, 1);
5633 /* another command or interrupt handler
5634 * may be running at this point.
5641 * ata_qc_new - Request an available ATA command, for queueing
5642 * @ap: Port associated with device @dev
5643 * @dev: Device from whom we request an available command structure
5649 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
5651 struct ata_queued_cmd *qc = NULL;
5654 /* no command while frozen */
5655 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5658 /* the last tag is reserved for internal command. */
5659 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5660 if (!test_and_set_bit(i, &ap->qc_allocated)) {
5661 qc = __ata_qc_from_tag(ap, i);
5672 * ata_qc_new_init - Request an available ATA command, and initialize it
5673 * @dev: Device from whom we request an available command structure
5679 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
5681 struct ata_port *ap = dev->link->ap;
5682 struct ata_queued_cmd *qc;
5684 qc = ata_qc_new(ap);
5697 * ata_qc_free - free unused ata_queued_cmd
5698 * @qc: Command to complete
5700 * Designed to free unused ata_queued_cmd object
5701 * in case something prevents using it.
5704 * spin_lock_irqsave(host lock)
5706 void ata_qc_free(struct ata_queued_cmd *qc)
5708 struct ata_port *ap = qc->ap;
5711 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5715 if (likely(ata_tag_valid(tag))) {
5716 qc->tag = ATA_TAG_POISON;
5717 clear_bit(tag, &ap->qc_allocated);
5721 void __ata_qc_complete(struct ata_queued_cmd *qc)
5723 struct ata_port *ap = qc->ap;
5724 struct ata_link *link = qc->dev->link;
5726 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5727 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
5729 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5732 /* command should be marked inactive atomically with qc completion */
5733 if (qc->tf.protocol == ATA_PROT_NCQ) {
5734 link->sactive &= ~(1 << qc->tag);
5736 ap->nr_active_links--;
5738 link->active_tag = ATA_TAG_POISON;
5739 ap->nr_active_links--;
5742 /* clear exclusive status */
5743 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
5744 ap->excl_link == link))
5745 ap->excl_link = NULL;
5747 /* atapi: mark qc as inactive to prevent the interrupt handler
5748 * from completing the command twice later, before the error handler
5749 * is called. (when rc != 0 and atapi request sense is needed)
5751 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5752 ap->qc_active &= ~(1 << qc->tag);
5754 /* call completion callback */
5755 qc->complete_fn(qc);
5758 static void fill_result_tf(struct ata_queued_cmd *qc)
5760 struct ata_port *ap = qc->ap;
5762 qc->result_tf.flags = qc->tf.flags;
5763 ap->ops->tf_read(ap, &qc->result_tf);
5766 static void ata_verify_xfer(struct ata_queued_cmd *qc)
5768 struct ata_device *dev = qc->dev;
5770 if (ata_tag_internal(qc->tag))
5773 if (ata_is_nodata(qc->tf.protocol))
5776 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
5779 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
5783 * ata_qc_complete - Complete an active ATA command
5784 * @qc: Command to complete
5785 * @err_mask: ATA Status register contents
5787 * Indicate to the mid and upper layers that an ATA
5788 * command has completed, with either an ok or not-ok status.
5791 * spin_lock_irqsave(host lock)
5793 void ata_qc_complete(struct ata_queued_cmd *qc)
5795 struct ata_port *ap = qc->ap;
5797 /* XXX: New EH and old EH use different mechanisms to
5798 * synchronize EH with regular execution path.
5800 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5801 * Normal execution path is responsible for not accessing a
5802 * failed qc. libata core enforces the rule by returning NULL
5803 * from ata_qc_from_tag() for failed qcs.
5805 * Old EH depends on ata_qc_complete() nullifying completion
5806 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5807 * not synchronize with interrupt handler. Only PIO task is
5810 if (ap->ops->error_handler) {
5811 struct ata_device *dev = qc->dev;
5812 struct ata_eh_info *ehi = &dev->link->eh_info;
5814 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5816 if (unlikely(qc->err_mask))
5817 qc->flags |= ATA_QCFLAG_FAILED;
5819 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5820 if (!ata_tag_internal(qc->tag)) {
5821 /* always fill result TF for failed qc */
5823 ata_qc_schedule_eh(qc);
5828 /* read result TF if requested */
5829 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5832 /* Some commands need post-processing after successful
5835 switch (qc->tf.command) {
5836 case ATA_CMD_SET_FEATURES:
5837 if (qc->tf.feature != SETFEATURES_WC_ON &&
5838 qc->tf.feature != SETFEATURES_WC_OFF)
5841 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5842 case ATA_CMD_SET_MULTI: /* multi_count changed */
5843 /* revalidate device */
5844 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5845 ata_port_schedule_eh(ap);
5849 dev->flags |= ATA_DFLAG_SLEEPING;
5853 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
5854 ata_verify_xfer(qc);
5856 __ata_qc_complete(qc);
5858 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5861 /* read result TF if failed or requested */
5862 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5865 __ata_qc_complete(qc);
5870 * ata_qc_complete_multiple - Complete multiple qcs successfully
5871 * @ap: port in question
5872 * @qc_active: new qc_active mask
5873 * @finish_qc: LLDD callback invoked before completing a qc
5875 * Complete in-flight commands. This functions is meant to be
5876 * called from low-level driver's interrupt routine to complete
5877 * requests normally. ap->qc_active and @qc_active is compared
5878 * and commands are completed accordingly.
5881 * spin_lock_irqsave(host lock)
5884 * Number of completed commands on success, -errno otherwise.
5886 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
5887 void (*finish_qc)(struct ata_queued_cmd *))
5893 done_mask = ap->qc_active ^ qc_active;
5895 if (unlikely(done_mask & qc_active)) {
5896 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5897 "(%08x->%08x)\n", ap->qc_active, qc_active);
5901 for (i = 0; i < ATA_MAX_QUEUE; i++) {
5902 struct ata_queued_cmd *qc;
5904 if (!(done_mask & (1 << i)))
5907 if ((qc = ata_qc_from_tag(ap, i))) {
5910 ata_qc_complete(qc);
5919 * ata_qc_issue - issue taskfile to device
5920 * @qc: command to issue to device
5922 * Prepare an ATA command to submission to device.
5923 * This includes mapping the data into a DMA-able
5924 * area, filling in the S/G table, and finally
5925 * writing the taskfile to hardware, starting the command.
5928 * spin_lock_irqsave(host lock)
5930 void ata_qc_issue(struct ata_queued_cmd *qc)
5932 struct ata_port *ap = qc->ap;
5933 struct ata_link *link = qc->dev->link;
5934 u8 prot = qc->tf.protocol;
5936 /* Make sure only one non-NCQ command is outstanding. The
5937 * check is skipped for old EH because it reuses active qc to
5938 * request ATAPI sense.
5940 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5942 if (prot == ATA_PROT_NCQ) {
5943 WARN_ON(link->sactive & (1 << qc->tag));
5946 ap->nr_active_links++;
5947 link->sactive |= 1 << qc->tag;
5949 WARN_ON(link->sactive);
5951 ap->nr_active_links++;
5952 link->active_tag = qc->tag;
5955 qc->flags |= ATA_QCFLAG_ACTIVE;
5956 ap->qc_active |= 1 << qc->tag;
5958 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5959 (ap->flags & ATA_FLAG_PIO_DMA))) {
5960 if (qc->flags & ATA_QCFLAG_SG) {
5961 if (ata_sg_setup(qc))
5963 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
5964 if (ata_sg_setup_one(qc))
5968 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5971 /* if device is sleeping, schedule softreset and abort the link */
5972 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5973 link->eh_info.action |= ATA_EH_SOFTRESET;
5974 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5975 ata_link_abort(link);
5979 ap->ops->qc_prep(qc);
5981 qc->err_mask |= ap->ops->qc_issue(qc);
5982 if (unlikely(qc->err_mask))
5987 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5988 qc->err_mask |= AC_ERR_SYSTEM;
5990 ata_qc_complete(qc);
5994 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
5995 * @qc: command to issue to device
5997 * Using various libata functions and hooks, this function
5998 * starts an ATA command. ATA commands are grouped into
5999 * classes called "protocols", and issuing each type of protocol
6000 * is slightly different.
6002 * May be used as the qc_issue() entry in ata_port_operations.
6005 * spin_lock_irqsave(host lock)
6008 * Zero on success, AC_ERR_* mask on failure
6011 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
6013 struct ata_port *ap = qc->ap;
6015 /* Use polling pio if the LLD doesn't handle
6016 * interrupt driven pio and atapi CDB interrupt.
6018 if (ap->flags & ATA_FLAG_PIO_POLLING) {
6019 switch (qc->tf.protocol) {
6021 case ATA_PROT_NODATA:
6022 case ATA_PROT_ATAPI:
6023 case ATA_PROT_ATAPI_NODATA:
6024 qc->tf.flags |= ATA_TFLAG_POLLING;
6026 case ATA_PROT_ATAPI_DMA:
6027 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
6028 /* see ata_dma_blacklisted() */
6036 /* select the device */
6037 ata_dev_select(ap, qc->dev->devno, 1, 0);
6039 /* start the command */
6040 switch (qc->tf.protocol) {
6041 case ATA_PROT_NODATA:
6042 if (qc->tf.flags & ATA_TFLAG_POLLING)
6043 ata_qc_set_polling(qc);
6045 ata_tf_to_host(ap, &qc->tf);
6046 ap->hsm_task_state = HSM_ST_LAST;
6048 if (qc->tf.flags & ATA_TFLAG_POLLING)
6049 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6054 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6056 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
6057 ap->ops->bmdma_setup(qc); /* set up bmdma */
6058 ap->ops->bmdma_start(qc); /* initiate bmdma */
6059 ap->hsm_task_state = HSM_ST_LAST;
6063 if (qc->tf.flags & ATA_TFLAG_POLLING)
6064 ata_qc_set_polling(qc);
6066 ata_tf_to_host(ap, &qc->tf);
6068 if (qc->tf.flags & ATA_TFLAG_WRITE) {
6069 /* PIO data out protocol */
6070 ap->hsm_task_state = HSM_ST_FIRST;
6071 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6073 /* always send first data block using
6074 * the ata_pio_task() codepath.
6077 /* PIO data in protocol */
6078 ap->hsm_task_state = HSM_ST;
6080 if (qc->tf.flags & ATA_TFLAG_POLLING)
6081 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6083 /* if polling, ata_pio_task() handles the rest.
6084 * otherwise, interrupt handler takes over from here.
6090 case ATA_PROT_ATAPI:
6091 case ATA_PROT_ATAPI_NODATA:
6092 if (qc->tf.flags & ATA_TFLAG_POLLING)
6093 ata_qc_set_polling(qc);
6095 ata_tf_to_host(ap, &qc->tf);
6097 ap->hsm_task_state = HSM_ST_FIRST;
6099 /* send cdb by polling if no cdb interrupt */
6100 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
6101 (qc->tf.flags & ATA_TFLAG_POLLING))
6102 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6105 case ATA_PROT_ATAPI_DMA:
6106 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6108 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
6109 ap->ops->bmdma_setup(qc); /* set up bmdma */
6110 ap->hsm_task_state = HSM_ST_FIRST;
6112 /* send cdb by polling if no cdb interrupt */
6113 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6114 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6119 return AC_ERR_SYSTEM;
6126 * ata_host_intr - Handle host interrupt for given (port, task)
6127 * @ap: Port on which interrupt arrived (possibly...)
6128 * @qc: Taskfile currently active in engine
6130 * Handle host interrupt for given queued command. Currently,
6131 * only DMA interrupts are handled. All other commands are
6132 * handled via polling with interrupts disabled (nIEN bit).
6135 * spin_lock_irqsave(host lock)
6138 * One if interrupt was handled, zero if not (shared irq).
6141 inline unsigned int ata_host_intr(struct ata_port *ap,
6142 struct ata_queued_cmd *qc)
6144 struct ata_eh_info *ehi = &ap->link.eh_info;
6145 u8 status, host_stat = 0;
6147 VPRINTK("ata%u: protocol %d task_state %d\n",
6148 ap->print_id, qc->tf.protocol, ap->hsm_task_state);
6150 /* Check whether we are expecting interrupt in this state */
6151 switch (ap->hsm_task_state) {
6153 /* Some pre-ATAPI-4 devices assert INTRQ
6154 * at this state when ready to receive CDB.
6157 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
6158 * The flag was turned on only for atapi devices. No
6159 * need to check ata_is_atapi(qc->tf.protocol) again.
6161 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6165 if (qc->tf.protocol == ATA_PROT_DMA ||
6166 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
6167 /* check status of DMA engine */
6168 host_stat = ap->ops->bmdma_status(ap);
6169 VPRINTK("ata%u: host_stat 0x%X\n",
6170 ap->print_id, host_stat);
6172 /* if it's not our irq... */
6173 if (!(host_stat & ATA_DMA_INTR))
6176 /* before we do anything else, clear DMA-Start bit */
6177 ap->ops->bmdma_stop(qc);
6179 if (unlikely(host_stat & ATA_DMA_ERR)) {
6180 /* error when transfering data to/from memory */
6181 qc->err_mask |= AC_ERR_HOST_BUS;
6182 ap->hsm_task_state = HSM_ST_ERR;
6192 /* check altstatus */
6193 status = ata_altstatus(ap);
6194 if (status & ATA_BUSY)
6197 /* check main status, clearing INTRQ */
6198 status = ata_chk_status(ap);
6199 if (unlikely(status & ATA_BUSY))
6202 /* ack bmdma irq events */
6203 ap->ops->irq_clear(ap);
6205 ata_hsm_move(ap, qc, status, 0);
6207 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
6208 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
6209 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
6211 return 1; /* irq handled */
6214 ap->stats.idle_irq++;
6217 if ((ap->stats.idle_irq % 1000) == 0) {
6219 ap->ops->irq_clear(ap);
6220 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
6224 return 0; /* irq not handled */
6228 * ata_interrupt - Default ATA host interrupt handler
6229 * @irq: irq line (unused)
6230 * @dev_instance: pointer to our ata_host information structure
6232 * Default interrupt handler for PCI IDE devices. Calls
6233 * ata_host_intr() for each port that is not disabled.
6236 * Obtains host lock during operation.
6239 * IRQ_NONE or IRQ_HANDLED.
6242 irqreturn_t ata_interrupt(int irq, void *dev_instance)
6244 struct ata_host *host = dev_instance;
6246 unsigned int handled = 0;
6247 unsigned long flags;
6249 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
6250 spin_lock_irqsave(&host->lock, flags);
6252 for (i = 0; i < host->n_ports; i++) {
6253 struct ata_port *ap;
6255 ap = host->ports[i];
6257 !(ap->flags & ATA_FLAG_DISABLED)) {
6258 struct ata_queued_cmd *qc;
6260 qc = ata_qc_from_tag(ap, ap->link.active_tag);
6261 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6262 (qc->flags & ATA_QCFLAG_ACTIVE))
6263 handled |= ata_host_intr(ap, qc);
6267 spin_unlock_irqrestore(&host->lock, flags);
6269 return IRQ_RETVAL(handled);
6273 * sata_scr_valid - test whether SCRs are accessible
6274 * @link: ATA link to test SCR accessibility for
6276 * Test whether SCRs are accessible for @link.
6282 * 1 if SCRs are accessible, 0 otherwise.
6284 int sata_scr_valid(struct ata_link *link)
6286 struct ata_port *ap = link->ap;
6288 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6292 * sata_scr_read - read SCR register of the specified port
6293 * @link: ATA link to read SCR for
6295 * @val: Place to store read value
6297 * Read SCR register @reg of @link into *@val. This function is
6298 * guaranteed to succeed if @link is ap->link, the cable type of
6299 * the port is SATA and the port implements ->scr_read.
6302 * None if @link is ap->link. Kernel thread context otherwise.
6305 * 0 on success, negative errno on failure.
6307 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6309 if (ata_is_host_link(link)) {
6310 struct ata_port *ap = link->ap;
6312 if (sata_scr_valid(link))
6313 return ap->ops->scr_read(ap, reg, val);
6317 return sata_pmp_scr_read(link, reg, val);
6321 * sata_scr_write - write SCR register of the specified port
6322 * @link: ATA link to write SCR for
6323 * @reg: SCR to write
6324 * @val: value to write
6326 * Write @val to SCR register @reg of @link. This function is
6327 * guaranteed to succeed if @link is ap->link, the cable type of
6328 * the port is SATA and the port implements ->scr_read.
6331 * None if @link is ap->link. Kernel thread context otherwise.
6334 * 0 on success, negative errno on failure.
6336 int sata_scr_write(struct ata_link *link, int reg, u32 val)
6338 if (ata_is_host_link(link)) {
6339 struct ata_port *ap = link->ap;
6341 if (sata_scr_valid(link))
6342 return ap->ops->scr_write(ap, reg, val);
6346 return sata_pmp_scr_write(link, reg, val);
6350 * sata_scr_write_flush - write SCR register of the specified port and flush
6351 * @link: ATA link to write SCR for
6352 * @reg: SCR to write
6353 * @val: value to write
6355 * This function is identical to sata_scr_write() except that this
6356 * function performs flush after writing to the register.
6359 * None if @link is ap->link. Kernel thread context otherwise.
6362 * 0 on success, negative errno on failure.
6364 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6366 if (ata_is_host_link(link)) {
6367 struct ata_port *ap = link->ap;
6370 if (sata_scr_valid(link)) {
6371 rc = ap->ops->scr_write(ap, reg, val);
6373 rc = ap->ops->scr_read(ap, reg, &val);
6379 return sata_pmp_scr_write(link, reg, val);
6383 * ata_link_online - test whether the given link is online
6384 * @link: ATA link to test
6386 * Test whether @link is online. Note that this function returns
6387 * 0 if online status of @link cannot be obtained, so
6388 * ata_link_online(link) != !ata_link_offline(link).
6394 * 1 if the port online status is available and online.
6396 int ata_link_online(struct ata_link *link)
6400 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
6401 (sstatus & 0xf) == 0x3)
6407 * ata_link_offline - test whether the given link is offline
6408 * @link: ATA link to test
6410 * Test whether @link is offline. Note that this function
6411 * returns 0 if offline status of @link cannot be obtained, so
6412 * ata_link_online(link) != !ata_link_offline(link).
6418 * 1 if the port offline status is available and offline.
6420 int ata_link_offline(struct ata_link *link)
6424 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
6425 (sstatus & 0xf) != 0x3)
6430 int ata_flush_cache(struct ata_device *dev)
6432 unsigned int err_mask;
6435 if (!ata_try_flush_cache(dev))
6438 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
6439 cmd = ATA_CMD_FLUSH_EXT;
6441 cmd = ATA_CMD_FLUSH;
6443 /* This is wrong. On a failed flush we get back the LBA of the lost
6444 sector and we should (assuming it wasn't aborted as unknown) issue
6445 a further flush command to continue the writeback until it
6447 err_mask = ata_do_simple_cmd(dev, cmd);
6449 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
6457 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
6458 unsigned int action, unsigned int ehi_flags,
6461 unsigned long flags;
6464 for (i = 0; i < host->n_ports; i++) {
6465 struct ata_port *ap = host->ports[i];
6466 struct ata_link *link;
6468 /* Previous resume operation might still be in
6469 * progress. Wait for PM_PENDING to clear.
6471 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
6472 ata_port_wait_eh(ap);
6473 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6476 /* request PM ops to EH */
6477 spin_lock_irqsave(ap->lock, flags);
6482 ap->pm_result = &rc;
6485 ap->pflags |= ATA_PFLAG_PM_PENDING;
6486 __ata_port_for_each_link(link, ap) {
6487 link->eh_info.action |= action;
6488 link->eh_info.flags |= ehi_flags;
6491 ata_port_schedule_eh(ap);
6493 spin_unlock_irqrestore(ap->lock, flags);
6495 /* wait and check result */
6497 ata_port_wait_eh(ap);
6498 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6508 * ata_host_suspend - suspend host
6509 * @host: host to suspend
6512 * Suspend @host. Actual operation is performed by EH. This
6513 * function requests EH to perform PM operations and waits for EH
6517 * Kernel thread context (may sleep).
6520 * 0 on success, -errno on failure.
6522 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6527 * disable link pm on all ports before requesting
6530 ata_lpm_enable(host);
6532 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6534 host->dev->power.power_state = mesg;
6539 * ata_host_resume - resume host
6540 * @host: host to resume
6542 * Resume @host. Actual operation is performed by EH. This
6543 * function requests EH to perform PM operations and returns.
6544 * Note that all resume operations are performed parallely.
6547 * Kernel thread context (may sleep).
6549 void ata_host_resume(struct ata_host *host)
6551 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
6552 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
6553 host->dev->power.power_state = PMSG_ON;
6555 /* reenable link pm */
6556 ata_lpm_disable(host);
6561 * ata_port_start - Set port up for dma.
6562 * @ap: Port to initialize
6564 * Called just after data structures for each port are
6565 * initialized. Allocates space for PRD table.
6567 * May be used as the port_start() entry in ata_port_operations.
6570 * Inherited from caller.
6572 int ata_port_start(struct ata_port *ap)
6574 struct device *dev = ap->dev;
6577 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
6582 rc = ata_pad_alloc(ap, dev);
6586 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
6587 (unsigned long long)ap->prd_dma);
6592 * ata_dev_init - Initialize an ata_device structure
6593 * @dev: Device structure to initialize
6595 * Initialize @dev in preparation for probing.
6598 * Inherited from caller.
6600 void ata_dev_init(struct ata_device *dev)
6602 struct ata_link *link = dev->link;
6603 struct ata_port *ap = link->ap;
6604 unsigned long flags;
6606 /* SATA spd limit is bound to the first device */
6607 link->sata_spd_limit = link->hw_sata_spd_limit;
6610 /* High bits of dev->flags are used to record warm plug
6611 * requests which occur asynchronously. Synchronize using
6614 spin_lock_irqsave(ap->lock, flags);
6615 dev->flags &= ~ATA_DFLAG_INIT_MASK;
6617 spin_unlock_irqrestore(ap->lock, flags);
6619 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
6620 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6621 dev->pio_mask = UINT_MAX;
6622 dev->mwdma_mask = UINT_MAX;
6623 dev->udma_mask = UINT_MAX;
6627 * ata_link_init - Initialize an ata_link structure
6628 * @ap: ATA port link is attached to
6629 * @link: Link structure to initialize
6630 * @pmp: Port multiplier port number
6635 * Kernel thread context (may sleep)
6637 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6641 /* clear everything except for devices */
6642 memset(link, 0, offsetof(struct ata_link, device[0]));
6646 link->active_tag = ATA_TAG_POISON;
6647 link->hw_sata_spd_limit = UINT_MAX;
6649 /* can't use iterator, ap isn't initialized yet */
6650 for (i = 0; i < ATA_MAX_DEVICES; i++) {
6651 struct ata_device *dev = &link->device[i];
6654 dev->devno = dev - link->device;
6660 * sata_link_init_spd - Initialize link->sata_spd_limit
6661 * @link: Link to configure sata_spd_limit for
6663 * Initialize @link->[hw_]sata_spd_limit to the currently
6667 * Kernel thread context (may sleep).
6670 * 0 on success, -errno on failure.
6672 int sata_link_init_spd(struct ata_link *link)
6677 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
6681 spd = (scontrol >> 4) & 0xf;
6683 link->hw_sata_spd_limit &= (1 << spd) - 1;
6685 link->sata_spd_limit = link->hw_sata_spd_limit;
6691 * ata_port_alloc - allocate and initialize basic ATA port resources
6692 * @host: ATA host this allocated port belongs to
6694 * Allocate and initialize basic ATA port resources.
6697 * Allocate ATA port on success, NULL on failure.
6700 * Inherited from calling layer (may sleep).
6702 struct ata_port *ata_port_alloc(struct ata_host *host)
6704 struct ata_port *ap;
6708 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6712 ap->pflags |= ATA_PFLAG_INITIALIZING;
6713 ap->lock = &host->lock;
6714 ap->flags = ATA_FLAG_DISABLED;
6716 ap->ctl = ATA_DEVCTL_OBS;
6718 ap->dev = host->dev;
6719 ap->last_ctl = 0xFF;
6721 #if defined(ATA_VERBOSE_DEBUG)
6722 /* turn on all debugging levels */
6723 ap->msg_enable = 0x00FF;
6724 #elif defined(ATA_DEBUG)
6725 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6727 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6730 INIT_DELAYED_WORK(&ap->port_task, NULL);
6731 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6732 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6733 INIT_LIST_HEAD(&ap->eh_done_q);
6734 init_waitqueue_head(&ap->eh_wait_q);
6735 init_timer_deferrable(&ap->fastdrain_timer);
6736 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
6737 ap->fastdrain_timer.data = (unsigned long)ap;
6739 ap->cbl = ATA_CBL_NONE;
6741 ata_link_init(ap, &ap->link, 0);
6744 ap->stats.unhandled_irq = 1;
6745 ap->stats.idle_irq = 1;
6750 static void ata_host_release(struct device *gendev, void *res)
6752 struct ata_host *host = dev_get_drvdata(gendev);
6755 for (i = 0; i < host->n_ports; i++) {
6756 struct ata_port *ap = host->ports[i];
6762 scsi_host_put(ap->scsi_host);
6764 kfree(ap->pmp_link);
6766 host->ports[i] = NULL;
6769 dev_set_drvdata(gendev, NULL);
6773 * ata_host_alloc - allocate and init basic ATA host resources
6774 * @dev: generic device this host is associated with
6775 * @max_ports: maximum number of ATA ports associated with this host
6777 * Allocate and initialize basic ATA host resources. LLD calls
6778 * this function to allocate a host, initializes it fully and
6779 * attaches it using ata_host_register().
6781 * @max_ports ports are allocated and host->n_ports is
6782 * initialized to @max_ports. The caller is allowed to decrease
6783 * host->n_ports before calling ata_host_register(). The unused
6784 * ports will be automatically freed on registration.
6787 * Allocate ATA host on success, NULL on failure.
6790 * Inherited from calling layer (may sleep).
6792 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6794 struct ata_host *host;
6800 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6803 /* alloc a container for our list of ATA ports (buses) */
6804 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6805 /* alloc a container for our list of ATA ports (buses) */
6806 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
6810 devres_add(dev, host);
6811 dev_set_drvdata(dev, host);
6813 spin_lock_init(&host->lock);
6815 host->n_ports = max_ports;
6817 /* allocate ports bound to this host */
6818 for (i = 0; i < max_ports; i++) {
6819 struct ata_port *ap;
6821 ap = ata_port_alloc(host);
6826 host->ports[i] = ap;
6829 devres_remove_group(dev, NULL);
6833 devres_release_group(dev, NULL);
6838 * ata_host_alloc_pinfo - alloc host and init with port_info array
6839 * @dev: generic device this host is associated with
6840 * @ppi: array of ATA port_info to initialize host with
6841 * @n_ports: number of ATA ports attached to this host
6843 * Allocate ATA host and initialize with info from @ppi. If NULL
6844 * terminated, @ppi may contain fewer entries than @n_ports. The
6845 * last entry will be used for the remaining ports.
6848 * Allocate ATA host on success, NULL on failure.
6851 * Inherited from calling layer (may sleep).
6853 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6854 const struct ata_port_info * const * ppi,
6857 const struct ata_port_info *pi;
6858 struct ata_host *host;
6861 host = ata_host_alloc(dev, n_ports);
6865 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6866 struct ata_port *ap = host->ports[i];
6871 ap->pio_mask = pi->pio_mask;
6872 ap->mwdma_mask = pi->mwdma_mask;
6873 ap->udma_mask = pi->udma_mask;
6874 ap->flags |= pi->flags;
6875 ap->link.flags |= pi->link_flags;
6876 ap->ops = pi->port_ops;
6878 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6879 host->ops = pi->port_ops;
6880 if (!host->private_data && pi->private_data)
6881 host->private_data = pi->private_data;
6887 static void ata_host_stop(struct device *gendev, void *res)
6889 struct ata_host *host = dev_get_drvdata(gendev);
6892 WARN_ON(!(host->flags & ATA_HOST_STARTED));
6894 for (i = 0; i < host->n_ports; i++) {
6895 struct ata_port *ap = host->ports[i];
6897 if (ap->ops->port_stop)
6898 ap->ops->port_stop(ap);
6901 if (host->ops->host_stop)
6902 host->ops->host_stop(host);
6906 * ata_host_start - start and freeze ports of an ATA host
6907 * @host: ATA host to start ports for
6909 * Start and then freeze ports of @host. Started status is
6910 * recorded in host->flags, so this function can be called
6911 * multiple times. Ports are guaranteed to get started only
6912 * once. If host->ops isn't initialized yet, its set to the
6913 * first non-dummy port ops.
6916 * Inherited from calling layer (may sleep).
6919 * 0 if all ports are started successfully, -errno otherwise.
6921 int ata_host_start(struct ata_host *host)
6924 void *start_dr = NULL;
6927 if (host->flags & ATA_HOST_STARTED)
6930 for (i = 0; i < host->n_ports; i++) {
6931 struct ata_port *ap = host->ports[i];
6933 if (!host->ops && !ata_port_is_dummy(ap))
6934 host->ops = ap->ops;
6936 if (ap->ops->port_stop)
6940 if (host->ops->host_stop)
6944 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
6949 for (i = 0; i < host->n_ports; i++) {
6950 struct ata_port *ap = host->ports[i];
6952 if (ap->ops->port_start) {
6953 rc = ap->ops->port_start(ap);
6956 dev_printk(KERN_ERR, host->dev,
6957 "failed to start port %d "
6958 "(errno=%d)\n", i, rc);
6962 ata_eh_freeze_port(ap);
6966 devres_add(host->dev, start_dr);
6967 host->flags |= ATA_HOST_STARTED;
6972 struct ata_port *ap = host->ports[i];
6974 if (ap->ops->port_stop)
6975 ap->ops->port_stop(ap);
6977 devres_free(start_dr);
6982 * ata_sas_host_init - Initialize a host struct
6983 * @host: host to initialize
6984 * @dev: device host is attached to
6985 * @flags: host flags
6989 * PCI/etc. bus probe sem.
6992 /* KILLME - the only user left is ipr */
6993 void ata_host_init(struct ata_host *host, struct device *dev,
6994 unsigned long flags, const struct ata_port_operations *ops)
6996 spin_lock_init(&host->lock);
6998 host->flags = flags;
7003 * ata_host_register - register initialized ATA host
7004 * @host: ATA host to register
7005 * @sht: template for SCSI host
7007 * Register initialized ATA host. @host is allocated using
7008 * ata_host_alloc() and fully initialized by LLD. This function
7009 * starts ports, registers @host with ATA and SCSI layers and
7010 * probe registered devices.
7013 * Inherited from calling layer (may sleep).
7016 * 0 on success, -errno otherwise.
7018 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
7022 /* host must have been started */
7023 if (!(host->flags & ATA_HOST_STARTED)) {
7024 dev_printk(KERN_ERR, host->dev,
7025 "BUG: trying to register unstarted host\n");
7030 /* Blow away unused ports. This happens when LLD can't
7031 * determine the exact number of ports to allocate at
7034 for (i = host->n_ports; host->ports[i]; i++)
7035 kfree(host->ports[i]);
7037 /* give ports names and add SCSI hosts */
7038 for (i = 0; i < host->n_ports; i++)
7039 host->ports[i]->print_id = ata_print_id++;
7041 rc = ata_scsi_add_hosts(host, sht);
7045 /* associate with ACPI nodes */
7046 ata_acpi_associate(host);
7048 /* set cable, sata_spd_limit and report */
7049 for (i = 0; i < host->n_ports; i++) {
7050 struct ata_port *ap = host->ports[i];
7051 unsigned long xfer_mask;
7053 /* set SATA cable type if still unset */
7054 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
7055 ap->cbl = ATA_CBL_SATA;
7057 /* init sata_spd_limit to the current value */
7058 sata_link_init_spd(&ap->link);
7060 /* print per-port info to dmesg */
7061 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
7064 if (!ata_port_is_dummy(ap)) {
7065 ata_port_printk(ap, KERN_INFO,
7066 "%cATA max %s %s\n",
7067 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
7068 ata_mode_string(xfer_mask),
7069 ap->link.eh_info.desc);
7070 ata_ehi_clear_desc(&ap->link.eh_info);
7072 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
7075 /* perform each probe synchronously */
7076 DPRINTK("probe begin\n");
7077 for (i = 0; i < host->n_ports; i++) {
7078 struct ata_port *ap = host->ports[i];
7082 if (ap->ops->error_handler) {
7083 struct ata_eh_info *ehi = &ap->link.eh_info;
7084 unsigned long flags;
7088 /* kick EH for boot probing */
7089 spin_lock_irqsave(ap->lock, flags);
7092 (1 << ata_link_max_devices(&ap->link)) - 1;
7093 ehi->action |= ATA_EH_SOFTRESET;
7094 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
7096 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
7097 ap->pflags |= ATA_PFLAG_LOADING;
7098 ata_port_schedule_eh(ap);
7100 spin_unlock_irqrestore(ap->lock, flags);
7102 /* wait for EH to finish */
7103 ata_port_wait_eh(ap);
7105 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
7106 rc = ata_bus_probe(ap);
7107 DPRINTK("ata%u: bus probe end\n", ap->print_id);
7110 /* FIXME: do something useful here?
7111 * Current libata behavior will
7112 * tear down everything when
7113 * the module is removed
7114 * or the h/w is unplugged.
7120 /* probes are done, now scan each port's disk(s) */
7121 DPRINTK("host probe begin\n");
7122 for (i = 0; i < host->n_ports; i++) {
7123 struct ata_port *ap = host->ports[i];
7125 ata_scsi_scan_host(ap, 1);
7126 ata_lpm_schedule(ap, ap->pm_policy);
7133 * ata_host_activate - start host, request IRQ and register it
7134 * @host: target ATA host
7135 * @irq: IRQ to request
7136 * @irq_handler: irq_handler used when requesting IRQ
7137 * @irq_flags: irq_flags used when requesting IRQ
7138 * @sht: scsi_host_template to use when registering the host
7140 * After allocating an ATA host and initializing it, most libata
7141 * LLDs perform three steps to activate the host - start host,
7142 * request IRQ and register it. This helper takes necessasry
7143 * arguments and performs the three steps in one go.
7145 * An invalid IRQ skips the IRQ registration and expects the host to
7146 * have set polling mode on the port. In this case, @irq_handler
7150 * Inherited from calling layer (may sleep).
7153 * 0 on success, -errno otherwise.
7155 int ata_host_activate(struct ata_host *host, int irq,
7156 irq_handler_t irq_handler, unsigned long irq_flags,
7157 struct scsi_host_template *sht)
7161 rc = ata_host_start(host);
7165 /* Special case for polling mode */
7167 WARN_ON(irq_handler);
7168 return ata_host_register(host, sht);
7171 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
7172 dev_driver_string(host->dev), host);
7176 for (i = 0; i < host->n_ports; i++)
7177 ata_port_desc(host->ports[i], "irq %d", irq);
7179 rc = ata_host_register(host, sht);
7180 /* if failed, just free the IRQ and leave ports alone */
7182 devm_free_irq(host->dev, irq, host);
7188 * ata_port_detach - Detach ATA port in prepration of device removal
7189 * @ap: ATA port to be detached
7191 * Detach all ATA devices and the associated SCSI devices of @ap;
7192 * then, remove the associated SCSI host. @ap is guaranteed to
7193 * be quiescent on return from this function.
7196 * Kernel thread context (may sleep).
7198 static void ata_port_detach(struct ata_port *ap)
7200 unsigned long flags;
7201 struct ata_link *link;
7202 struct ata_device *dev;
7204 if (!ap->ops->error_handler)
7207 /* tell EH we're leaving & flush EH */
7208 spin_lock_irqsave(ap->lock, flags);
7209 ap->pflags |= ATA_PFLAG_UNLOADING;
7210 spin_unlock_irqrestore(ap->lock, flags);
7212 ata_port_wait_eh(ap);
7214 /* EH is now guaranteed to see UNLOADING - EH context belongs
7215 * to us. Disable all existing devices.
7217 ata_port_for_each_link(link, ap) {
7218 ata_link_for_each_dev(dev, link)
7219 ata_dev_disable(dev);
7222 /* Final freeze & EH. All in-flight commands are aborted. EH
7223 * will be skipped and retrials will be terminated with bad
7226 spin_lock_irqsave(ap->lock, flags);
7227 ata_port_freeze(ap); /* won't be thawed */
7228 spin_unlock_irqrestore(ap->lock, flags);
7230 ata_port_wait_eh(ap);
7231 cancel_rearming_delayed_work(&ap->hotplug_task);
7234 /* remove the associated SCSI host */
7235 scsi_remove_host(ap->scsi_host);
7239 * ata_host_detach - Detach all ports of an ATA host
7240 * @host: Host to detach
7242 * Detach all ports of @host.
7245 * Kernel thread context (may sleep).
7247 void ata_host_detach(struct ata_host *host)
7251 for (i = 0; i < host->n_ports; i++)
7252 ata_port_detach(host->ports[i]);
7254 /* the host is dead now, dissociate ACPI */
7255 ata_acpi_dissociate(host);
7259 * ata_std_ports - initialize ioaddr with standard port offsets.
7260 * @ioaddr: IO address structure to be initialized
7262 * Utility function which initializes data_addr, error_addr,
7263 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
7264 * device_addr, status_addr, and command_addr to standard offsets
7265 * relative to cmd_addr.
7267 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
7270 void ata_std_ports(struct ata_ioports *ioaddr)
7272 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
7273 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
7274 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
7275 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
7276 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
7277 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
7278 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
7279 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
7280 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
7281 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
7288 * ata_pci_remove_one - PCI layer callback for device removal
7289 * @pdev: PCI device that was removed
7291 * PCI layer indicates to libata via this hook that hot-unplug or
7292 * module unload event has occurred. Detach all ports. Resource
7293 * release is handled via devres.
7296 * Inherited from PCI layer (may sleep).
7298 void ata_pci_remove_one(struct pci_dev *pdev)
7300 struct device *dev = &pdev->dev;
7301 struct ata_host *host = dev_get_drvdata(dev);
7303 ata_host_detach(host);
7306 /* move to PCI subsystem */
7307 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
7309 unsigned long tmp = 0;
7311 switch (bits->width) {
7314 pci_read_config_byte(pdev, bits->reg, &tmp8);
7320 pci_read_config_word(pdev, bits->reg, &tmp16);
7326 pci_read_config_dword(pdev, bits->reg, &tmp32);
7337 return (tmp == bits->val) ? 1 : 0;
7341 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
7343 pci_save_state(pdev);
7344 pci_disable_device(pdev);
7346 if (mesg.event == PM_EVENT_SUSPEND)
7347 pci_set_power_state(pdev, PCI_D3hot);
7350 int ata_pci_device_do_resume(struct pci_dev *pdev)
7354 pci_set_power_state(pdev, PCI_D0);
7355 pci_restore_state(pdev);
7357 rc = pcim_enable_device(pdev);
7359 dev_printk(KERN_ERR, &pdev->dev,
7360 "failed to enable device after resume (%d)\n", rc);
7364 pci_set_master(pdev);
7368 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7370 struct ata_host *host = dev_get_drvdata(&pdev->dev);
7373 rc = ata_host_suspend(host, mesg);
7377 ata_pci_device_do_suspend(pdev, mesg);
7382 int ata_pci_device_resume(struct pci_dev *pdev)
7384 struct ata_host *host = dev_get_drvdata(&pdev->dev);
7387 rc = ata_pci_device_do_resume(pdev);
7389 ata_host_resume(host);
7392 #endif /* CONFIG_PM */
7394 #endif /* CONFIG_PCI */
7397 static int __init ata_init(void)
7399 ata_probe_timeout *= HZ;
7400 ata_wq = create_workqueue("ata");
7404 ata_aux_wq = create_singlethread_workqueue("ata_aux");
7406 destroy_workqueue(ata_wq);
7410 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
7414 static void __exit ata_exit(void)
7416 destroy_workqueue(ata_wq);
7417 destroy_workqueue(ata_aux_wq);
7420 subsys_initcall(ata_init);
7421 module_exit(ata_exit);
7423 static unsigned long ratelimit_time;
7424 static DEFINE_SPINLOCK(ata_ratelimit_lock);
7426 int ata_ratelimit(void)
7429 unsigned long flags;
7431 spin_lock_irqsave(&ata_ratelimit_lock, flags);
7433 if (time_after(jiffies, ratelimit_time)) {
7435 ratelimit_time = jiffies + (HZ/5);
7439 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
7445 * ata_wait_register - wait until register value changes
7446 * @reg: IO-mapped register
7447 * @mask: Mask to apply to read register value
7448 * @val: Wait condition
7449 * @interval_msec: polling interval in milliseconds
7450 * @timeout_msec: timeout in milliseconds
7452 * Waiting for some bits of register to change is a common
7453 * operation for ATA controllers. This function reads 32bit LE
7454 * IO-mapped register @reg and tests for the following condition.
7456 * (*@reg & mask) != val
7458 * If the condition is met, it returns; otherwise, the process is
7459 * repeated after @interval_msec until timeout.
7462 * Kernel thread context (may sleep)
7465 * The final register value.
7467 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
7468 unsigned long interval_msec,
7469 unsigned long timeout_msec)
7471 unsigned long timeout;
7474 tmp = ioread32(reg);
7476 /* Calculate timeout _after_ the first read to make sure
7477 * preceding writes reach the controller before starting to
7478 * eat away the timeout.
7480 timeout = jiffies + (timeout_msec * HZ) / 1000;
7482 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
7483 msleep(interval_msec);
7484 tmp = ioread32(reg);
7493 static void ata_dummy_noret(struct ata_port *ap) { }
7494 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
7495 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
7497 static u8 ata_dummy_check_status(struct ata_port *ap)
7502 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
7504 return AC_ERR_SYSTEM;
7507 const struct ata_port_operations ata_dummy_port_ops = {
7508 .check_status = ata_dummy_check_status,
7509 .check_altstatus = ata_dummy_check_status,
7510 .dev_select = ata_noop_dev_select,
7511 .qc_prep = ata_noop_qc_prep,
7512 .qc_issue = ata_dummy_qc_issue,
7513 .freeze = ata_dummy_noret,
7514 .thaw = ata_dummy_noret,
7515 .error_handler = ata_dummy_noret,
7516 .post_internal_cmd = ata_dummy_qc_noret,
7517 .irq_clear = ata_dummy_noret,
7518 .port_start = ata_dummy_ret0,
7519 .port_stop = ata_dummy_noret,
7522 const struct ata_port_info ata_dummy_port_info = {
7523 .port_ops = &ata_dummy_port_ops,
7527 * libata is essentially a library of internal helper functions for
7528 * low-level ATA host controller drivers. As such, the API/ABI is
7529 * likely to change as new drivers are added and updated.
7530 * Do not depend on ABI/API stability.
7532 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7533 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7534 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7535 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7536 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7537 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7538 EXPORT_SYMBOL_GPL(ata_std_ports);
7539 EXPORT_SYMBOL_GPL(ata_host_init);
7540 EXPORT_SYMBOL_GPL(ata_host_alloc);
7541 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7542 EXPORT_SYMBOL_GPL(ata_host_start);
7543 EXPORT_SYMBOL_GPL(ata_host_register);
7544 EXPORT_SYMBOL_GPL(ata_host_activate);
7545 EXPORT_SYMBOL_GPL(ata_host_detach);
7546 EXPORT_SYMBOL_GPL(ata_sg_init);
7547 EXPORT_SYMBOL_GPL(ata_sg_init_one);
7548 EXPORT_SYMBOL_GPL(ata_hsm_move);
7549 EXPORT_SYMBOL_GPL(ata_qc_complete);
7550 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7551 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
7552 EXPORT_SYMBOL_GPL(ata_tf_load);
7553 EXPORT_SYMBOL_GPL(ata_tf_read);
7554 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
7555 EXPORT_SYMBOL_GPL(ata_std_dev_select);
7556 EXPORT_SYMBOL_GPL(sata_print_link_status);
7557 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7558 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7559 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
7560 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
7561 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
7562 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
7563 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
7564 EXPORT_SYMBOL_GPL(ata_mode_string);
7565 EXPORT_SYMBOL_GPL(ata_id_xfermask);
7566 EXPORT_SYMBOL_GPL(ata_check_status);
7567 EXPORT_SYMBOL_GPL(ata_altstatus);
7568 EXPORT_SYMBOL_GPL(ata_exec_command);
7569 EXPORT_SYMBOL_GPL(ata_port_start);
7570 EXPORT_SYMBOL_GPL(ata_sff_port_start);
7571 EXPORT_SYMBOL_GPL(ata_interrupt);
7572 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7573 EXPORT_SYMBOL_GPL(ata_data_xfer);
7574 EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7575 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
7576 EXPORT_SYMBOL_GPL(ata_qc_prep);
7577 EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7578 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7579 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
7580 EXPORT_SYMBOL_GPL(ata_bmdma_start);
7581 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
7582 EXPORT_SYMBOL_GPL(ata_bmdma_status);
7583 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7584 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
7585 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
7586 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
7587 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
7588 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
7589 EXPORT_SYMBOL_GPL(ata_port_probe);
7590 EXPORT_SYMBOL_GPL(ata_dev_disable);
7591 EXPORT_SYMBOL_GPL(sata_set_spd);
7592 EXPORT_SYMBOL_GPL(sata_link_debounce);
7593 EXPORT_SYMBOL_GPL(sata_link_resume);
7594 EXPORT_SYMBOL_GPL(ata_bus_reset);
7595 EXPORT_SYMBOL_GPL(ata_std_prereset);
7596 EXPORT_SYMBOL_GPL(ata_std_softreset);
7597 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7598 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7599 EXPORT_SYMBOL_GPL(ata_std_postreset);
7600 EXPORT_SYMBOL_GPL(ata_dev_classify);
7601 EXPORT_SYMBOL_GPL(ata_dev_pair);
7602 EXPORT_SYMBOL_GPL(ata_port_disable);
7603 EXPORT_SYMBOL_GPL(ata_ratelimit);
7604 EXPORT_SYMBOL_GPL(ata_wait_register);
7605 EXPORT_SYMBOL_GPL(ata_busy_sleep);
7606 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7607 EXPORT_SYMBOL_GPL(ata_wait_ready);
7608 EXPORT_SYMBOL_GPL(ata_port_queue_task);
7609 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
7610 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7611 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7612 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7613 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7614 EXPORT_SYMBOL_GPL(ata_host_intr);
7615 EXPORT_SYMBOL_GPL(sata_scr_valid);
7616 EXPORT_SYMBOL_GPL(sata_scr_read);
7617 EXPORT_SYMBOL_GPL(sata_scr_write);
7618 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7619 EXPORT_SYMBOL_GPL(ata_link_online);
7620 EXPORT_SYMBOL_GPL(ata_link_offline);
7622 EXPORT_SYMBOL_GPL(ata_host_suspend);
7623 EXPORT_SYMBOL_GPL(ata_host_resume);
7624 #endif /* CONFIG_PM */
7625 EXPORT_SYMBOL_GPL(ata_id_string);
7626 EXPORT_SYMBOL_GPL(ata_id_c_string);
7627 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7629 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7630 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
7631 EXPORT_SYMBOL_GPL(ata_timing_compute);
7632 EXPORT_SYMBOL_GPL(ata_timing_merge);
7635 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7636 EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
7637 EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7638 EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
7639 EXPORT_SYMBOL_GPL(ata_pci_init_one);
7640 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7642 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7643 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7644 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7645 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7646 #endif /* CONFIG_PM */
7647 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
7648 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
7649 #endif /* CONFIG_PCI */
7651 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7652 EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
7653 EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
7654 EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
7655 EXPORT_SYMBOL_GPL(sata_pmp_do_eh);
7657 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7658 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7659 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7660 EXPORT_SYMBOL_GPL(ata_port_desc);
7662 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7663 #endif /* CONFIG_PCI */
7664 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7665 EXPORT_SYMBOL_GPL(ata_link_abort);
7666 EXPORT_SYMBOL_GPL(ata_port_abort);
7667 EXPORT_SYMBOL_GPL(ata_port_freeze);
7668 EXPORT_SYMBOL_GPL(sata_async_notification);
7669 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7670 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7671 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7672 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7673 EXPORT_SYMBOL_GPL(ata_do_eh);
7674 EXPORT_SYMBOL_GPL(ata_irq_on);
7675 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
7677 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7678 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7679 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7680 EXPORT_SYMBOL_GPL(ata_cable_ignore);
7681 EXPORT_SYMBOL_GPL(ata_cable_sata);