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/spinlock.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/timer.h>
53 #include <linux/interrupt.h>
54 #include <linux/completion.h>
55 #include <linux/suspend.h>
56 #include <linux/workqueue.h>
57 #include <linux/jiffies.h>
58 #include <linux/scatterlist.h>
60 #include <scsi/scsi.h>
61 #include <scsi/scsi_cmnd.h>
62 #include <scsi/scsi_host.h>
63 #include <linux/libata.h>
64 #include <asm/byteorder.h>
65 #include <linux/cdrom.h>
70 /* debounce timing parameters in msecs { interval, duration, timeout } */
71 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
72 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
73 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
75 const struct ata_port_operations ata_base_port_ops = {
76 .prereset = ata_std_prereset,
77 .postreset = ata_std_postreset,
78 .error_handler = ata_std_error_handler,
81 const struct ata_port_operations sata_port_ops = {
82 .inherits = &ata_base_port_ops,
84 .qc_defer = ata_std_qc_defer,
85 .hardreset = sata_std_hardreset,
88 static unsigned int ata_dev_init_params(struct ata_device *dev,
89 u16 heads, u16 sectors);
90 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
91 static unsigned int ata_dev_set_feature(struct ata_device *dev,
92 u8 enable, u8 feature);
93 static void ata_dev_xfermask(struct ata_device *dev);
94 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
96 unsigned int ata_print_id = 1;
97 static struct workqueue_struct *ata_wq;
99 struct workqueue_struct *ata_aux_wq;
101 struct ata_force_param {
105 unsigned long xfer_mask;
106 unsigned int horkage_on;
107 unsigned int horkage_off;
110 struct ata_force_ent {
113 struct ata_force_param param;
116 static struct ata_force_ent *ata_force_tbl;
117 static int ata_force_tbl_size;
119 static char ata_force_param_buf[PAGE_SIZE] __initdata;
120 /* param_buf is thrown away after initialization, disallow read */
121 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
122 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
124 int atapi_enabled = 1;
125 module_param(atapi_enabled, int, 0444);
126 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
128 static int atapi_dmadir = 0;
129 module_param(atapi_dmadir, int, 0444);
130 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
132 int atapi_passthru16 = 1;
133 module_param(atapi_passthru16, int, 0444);
134 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
137 module_param_named(fua, libata_fua, int, 0444);
138 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
140 static int ata_ignore_hpa;
141 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
142 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
144 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
145 module_param_named(dma, libata_dma_mask, int, 0444);
146 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
148 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
149 module_param(ata_probe_timeout, int, 0444);
150 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
152 int libata_noacpi = 0;
153 module_param_named(noacpi, libata_noacpi, int, 0444);
154 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
156 int libata_allow_tpm = 0;
157 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
158 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
160 MODULE_AUTHOR("Jeff Garzik");
161 MODULE_DESCRIPTION("Library module for ATA devices");
162 MODULE_LICENSE("GPL");
163 MODULE_VERSION(DRV_VERSION);
167 * ata_force_cbl - force cable type according to libata.force
168 * @ap: ATA port of interest
170 * Force cable type according to libata.force and whine about it.
171 * The last entry which has matching port number is used, so it
172 * can be specified as part of device force parameters. For
173 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
179 void ata_force_cbl(struct ata_port *ap)
183 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
184 const struct ata_force_ent *fe = &ata_force_tbl[i];
186 if (fe->port != -1 && fe->port != ap->print_id)
189 if (fe->param.cbl == ATA_CBL_NONE)
192 ap->cbl = fe->param.cbl;
193 ata_port_printk(ap, KERN_NOTICE,
194 "FORCE: cable set to %s\n", fe->param.name);
200 * ata_force_spd_limit - force SATA spd limit according to libata.force
201 * @link: ATA link of interest
203 * Force SATA spd limit according to libata.force and whine about
204 * it. When only the port part is specified (e.g. 1:), the limit
205 * applies to all links connected to both the host link and all
206 * fan-out ports connected via PMP. If the device part is
207 * specified as 0 (e.g. 1.00:), it specifies the first fan-out
208 * link not the host link. Device number 15 always points to the
209 * host link whether PMP is attached or not.
214 static void ata_force_spd_limit(struct ata_link *link)
218 if (ata_is_host_link(link))
223 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
224 const struct ata_force_ent *fe = &ata_force_tbl[i];
226 if (fe->port != -1 && fe->port != link->ap->print_id)
229 if (fe->device != -1 && fe->device != linkno)
232 if (!fe->param.spd_limit)
235 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
236 ata_link_printk(link, KERN_NOTICE,
237 "FORCE: PHY spd limit set to %s\n", fe->param.name);
243 * ata_force_xfermask - force xfermask according to libata.force
244 * @dev: ATA device of interest
246 * Force xfer_mask according to libata.force and whine about it.
247 * For consistency with link selection, device number 15 selects
248 * the first device connected to the host link.
253 static void ata_force_xfermask(struct ata_device *dev)
255 int devno = dev->link->pmp + dev->devno;
256 int alt_devno = devno;
259 /* allow n.15 for the first device attached to host port */
260 if (ata_is_host_link(dev->link) && devno == 0)
263 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
264 const struct ata_force_ent *fe = &ata_force_tbl[i];
265 unsigned long pio_mask, mwdma_mask, udma_mask;
267 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
270 if (fe->device != -1 && fe->device != devno &&
271 fe->device != alt_devno)
274 if (!fe->param.xfer_mask)
277 ata_unpack_xfermask(fe->param.xfer_mask,
278 &pio_mask, &mwdma_mask, &udma_mask);
280 dev->udma_mask = udma_mask;
281 else if (mwdma_mask) {
283 dev->mwdma_mask = mwdma_mask;
287 dev->pio_mask = pio_mask;
290 ata_dev_printk(dev, KERN_NOTICE,
291 "FORCE: xfer_mask set to %s\n", fe->param.name);
297 * ata_force_horkage - force horkage according to libata.force
298 * @dev: ATA device of interest
300 * Force horkage according to libata.force and whine about it.
301 * For consistency with link selection, device number 15 selects
302 * the first device connected to the host link.
307 static void ata_force_horkage(struct ata_device *dev)
309 int devno = dev->link->pmp + dev->devno;
310 int alt_devno = devno;
313 /* allow n.15 for the first device attached to host port */
314 if (ata_is_host_link(dev->link) && devno == 0)
317 for (i = 0; i < ata_force_tbl_size; i++) {
318 const struct ata_force_ent *fe = &ata_force_tbl[i];
320 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
323 if (fe->device != -1 && fe->device != devno &&
324 fe->device != alt_devno)
327 if (!(~dev->horkage & fe->param.horkage_on) &&
328 !(dev->horkage & fe->param.horkage_off))
331 dev->horkage |= fe->param.horkage_on;
332 dev->horkage &= ~fe->param.horkage_off;
334 ata_dev_printk(dev, KERN_NOTICE,
335 "FORCE: horkage modified (%s)\n", fe->param.name);
340 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
341 * @opcode: SCSI opcode
343 * Determine ATAPI command type from @opcode.
349 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
351 int atapi_cmd_type(u8 opcode)
360 case GPCMD_WRITE_AND_VERIFY_10:
364 case GPCMD_READ_CD_MSF:
365 return ATAPI_READ_CD;
369 if (atapi_passthru16)
370 return ATAPI_PASS_THRU;
378 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
379 * @tf: Taskfile to convert
380 * @pmp: Port multiplier port
381 * @is_cmd: This FIS is for command
382 * @fis: Buffer into which data will output
384 * Converts a standard ATA taskfile to a Serial ATA
385 * FIS structure (Register - Host to Device).
388 * Inherited from caller.
390 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
392 fis[0] = 0x27; /* Register - Host to Device FIS */
393 fis[1] = pmp & 0xf; /* Port multiplier number*/
395 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
397 fis[2] = tf->command;
398 fis[3] = tf->feature;
405 fis[8] = tf->hob_lbal;
406 fis[9] = tf->hob_lbam;
407 fis[10] = tf->hob_lbah;
408 fis[11] = tf->hob_feature;
411 fis[13] = tf->hob_nsect;
422 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
423 * @fis: Buffer from which data will be input
424 * @tf: Taskfile to output
426 * Converts a serial ATA FIS structure to a standard ATA taskfile.
429 * Inherited from caller.
432 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
434 tf->command = fis[2]; /* status */
435 tf->feature = fis[3]; /* error */
442 tf->hob_lbal = fis[8];
443 tf->hob_lbam = fis[9];
444 tf->hob_lbah = fis[10];
447 tf->hob_nsect = fis[13];
450 static const u8 ata_rw_cmds[] = {
454 ATA_CMD_READ_MULTI_EXT,
455 ATA_CMD_WRITE_MULTI_EXT,
459 ATA_CMD_WRITE_MULTI_FUA_EXT,
463 ATA_CMD_PIO_READ_EXT,
464 ATA_CMD_PIO_WRITE_EXT,
477 ATA_CMD_WRITE_FUA_EXT
481 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
482 * @tf: command to examine and configure
483 * @dev: device tf belongs to
485 * Examine the device configuration and tf->flags to calculate
486 * the proper read/write commands and protocol to use.
491 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
495 int index, fua, lba48, write;
497 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
498 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
499 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
501 if (dev->flags & ATA_DFLAG_PIO) {
502 tf->protocol = ATA_PROT_PIO;
503 index = dev->multi_count ? 0 : 8;
504 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
505 /* Unable to use DMA due to host limitation */
506 tf->protocol = ATA_PROT_PIO;
507 index = dev->multi_count ? 0 : 8;
509 tf->protocol = ATA_PROT_DMA;
513 cmd = ata_rw_cmds[index + fua + lba48 + write];
522 * ata_tf_read_block - Read block address from ATA taskfile
523 * @tf: ATA taskfile of interest
524 * @dev: ATA device @tf belongs to
529 * Read block address from @tf. This function can handle all
530 * three address formats - LBA, LBA48 and CHS. tf->protocol and
531 * flags select the address format to use.
534 * Block address read from @tf.
536 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
540 if (tf->flags & ATA_TFLAG_LBA) {
541 if (tf->flags & ATA_TFLAG_LBA48) {
542 block |= (u64)tf->hob_lbah << 40;
543 block |= (u64)tf->hob_lbam << 32;
544 block |= tf->hob_lbal << 24;
546 block |= (tf->device & 0xf) << 24;
548 block |= tf->lbah << 16;
549 block |= tf->lbam << 8;
554 cyl = tf->lbam | (tf->lbah << 8);
555 head = tf->device & 0xf;
558 block = (cyl * dev->heads + head) * dev->sectors + sect;
565 * ata_build_rw_tf - Build ATA taskfile for given read/write request
566 * @tf: Target ATA taskfile
567 * @dev: ATA device @tf belongs to
568 * @block: Block address
569 * @n_block: Number of blocks
570 * @tf_flags: RW/FUA etc...
576 * Build ATA taskfile @tf for read/write request described by
577 * @block, @n_block, @tf_flags and @tag on @dev.
581 * 0 on success, -ERANGE if the request is too large for @dev,
582 * -EINVAL if the request is invalid.
584 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
585 u64 block, u32 n_block, unsigned int tf_flags,
588 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
589 tf->flags |= tf_flags;
591 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
593 if (!lba_48_ok(block, n_block))
596 tf->protocol = ATA_PROT_NCQ;
597 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
599 if (tf->flags & ATA_TFLAG_WRITE)
600 tf->command = ATA_CMD_FPDMA_WRITE;
602 tf->command = ATA_CMD_FPDMA_READ;
604 tf->nsect = tag << 3;
605 tf->hob_feature = (n_block >> 8) & 0xff;
606 tf->feature = n_block & 0xff;
608 tf->hob_lbah = (block >> 40) & 0xff;
609 tf->hob_lbam = (block >> 32) & 0xff;
610 tf->hob_lbal = (block >> 24) & 0xff;
611 tf->lbah = (block >> 16) & 0xff;
612 tf->lbam = (block >> 8) & 0xff;
613 tf->lbal = block & 0xff;
616 if (tf->flags & ATA_TFLAG_FUA)
617 tf->device |= 1 << 7;
618 } else if (dev->flags & ATA_DFLAG_LBA) {
619 tf->flags |= ATA_TFLAG_LBA;
621 if (lba_28_ok(block, n_block)) {
623 tf->device |= (block >> 24) & 0xf;
624 } else if (lba_48_ok(block, n_block)) {
625 if (!(dev->flags & ATA_DFLAG_LBA48))
629 tf->flags |= ATA_TFLAG_LBA48;
631 tf->hob_nsect = (n_block >> 8) & 0xff;
633 tf->hob_lbah = (block >> 40) & 0xff;
634 tf->hob_lbam = (block >> 32) & 0xff;
635 tf->hob_lbal = (block >> 24) & 0xff;
637 /* request too large even for LBA48 */
640 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
643 tf->nsect = n_block & 0xff;
645 tf->lbah = (block >> 16) & 0xff;
646 tf->lbam = (block >> 8) & 0xff;
647 tf->lbal = block & 0xff;
649 tf->device |= ATA_LBA;
652 u32 sect, head, cyl, track;
654 /* The request -may- be too large for CHS addressing. */
655 if (!lba_28_ok(block, n_block))
658 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
661 /* Convert LBA to CHS */
662 track = (u32)block / dev->sectors;
663 cyl = track / dev->heads;
664 head = track % dev->heads;
665 sect = (u32)block % dev->sectors + 1;
667 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
668 (u32)block, track, cyl, head, sect);
670 /* Check whether the converted CHS can fit.
674 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
677 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
688 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
689 * @pio_mask: pio_mask
690 * @mwdma_mask: mwdma_mask
691 * @udma_mask: udma_mask
693 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
694 * unsigned int xfer_mask.
702 unsigned long ata_pack_xfermask(unsigned long pio_mask,
703 unsigned long mwdma_mask,
704 unsigned long udma_mask)
706 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
707 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
708 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
712 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
713 * @xfer_mask: xfer_mask to unpack
714 * @pio_mask: resulting pio_mask
715 * @mwdma_mask: resulting mwdma_mask
716 * @udma_mask: resulting udma_mask
718 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
719 * Any NULL distination masks will be ignored.
721 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
722 unsigned long *mwdma_mask, unsigned long *udma_mask)
725 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
727 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
729 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
732 static const struct ata_xfer_ent {
736 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
737 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
738 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
743 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
744 * @xfer_mask: xfer_mask of interest
746 * Return matching XFER_* value for @xfer_mask. Only the highest
747 * bit of @xfer_mask is considered.
753 * Matching XFER_* value, 0xff if no match found.
755 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
757 int highbit = fls(xfer_mask) - 1;
758 const struct ata_xfer_ent *ent;
760 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
761 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
762 return ent->base + highbit - ent->shift;
767 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
768 * @xfer_mode: XFER_* of interest
770 * Return matching xfer_mask for @xfer_mode.
776 * Matching xfer_mask, 0 if no match found.
778 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
780 const struct ata_xfer_ent *ent;
782 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
783 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
784 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
785 & ~((1 << ent->shift) - 1);
790 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
791 * @xfer_mode: XFER_* of interest
793 * Return matching xfer_shift for @xfer_mode.
799 * Matching xfer_shift, -1 if no match found.
801 int ata_xfer_mode2shift(unsigned long xfer_mode)
803 const struct ata_xfer_ent *ent;
805 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
806 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
812 * ata_mode_string - convert xfer_mask to string
813 * @xfer_mask: mask of bits supported; only highest bit counts.
815 * Determine string which represents the highest speed
816 * (highest bit in @modemask).
822 * Constant C string representing highest speed listed in
823 * @mode_mask, or the constant C string "<n/a>".
825 const char *ata_mode_string(unsigned long xfer_mask)
827 static const char * const xfer_mode_str[] = {
851 highbit = fls(xfer_mask) - 1;
852 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
853 return xfer_mode_str[highbit];
857 static const char *sata_spd_string(unsigned int spd)
859 static const char * const spd_str[] = {
864 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
866 return spd_str[spd - 1];
869 void ata_dev_disable(struct ata_device *dev)
871 if (ata_dev_enabled(dev)) {
872 if (ata_msg_drv(dev->link->ap))
873 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
874 ata_acpi_on_disable(dev);
875 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
881 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
883 struct ata_link *link = dev->link;
884 struct ata_port *ap = link->ap;
886 unsigned int err_mask;
890 * disallow DIPM for drivers which haven't set
891 * ATA_FLAG_IPM. This is because when DIPM is enabled,
892 * phy ready will be set in the interrupt status on
893 * state changes, which will cause some drivers to
894 * think there are errors - additionally drivers will
895 * need to disable hot plug.
897 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
898 ap->pm_policy = NOT_AVAILABLE;
903 * For DIPM, we will only enable it for the
906 * Why? Because Disks are too stupid to know that
907 * If the host rejects a request to go to SLUMBER
908 * they should retry at PARTIAL, and instead it
909 * just would give up. So, for medium_power to
910 * work at all, we need to only allow HIPM.
912 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
918 /* no restrictions on IPM transitions */
919 scontrol &= ~(0x3 << 8);
920 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
925 if (dev->flags & ATA_DFLAG_DIPM)
926 err_mask = ata_dev_set_feature(dev,
927 SETFEATURES_SATA_ENABLE, SATA_DIPM);
930 /* allow IPM to PARTIAL */
931 scontrol &= ~(0x1 << 8);
932 scontrol |= (0x2 << 8);
933 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
938 * we don't have to disable DIPM since IPM flags
939 * disallow transitions to SLUMBER, which effectively
940 * disable DIPM if it does not support PARTIAL
944 case MAX_PERFORMANCE:
945 /* disable all IPM transitions */
946 scontrol |= (0x3 << 8);
947 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
952 * we don't have to disable DIPM since IPM flags
953 * disallow all transitions which effectively
954 * disable DIPM anyway.
959 /* FIXME: handle SET FEATURES failure */
966 * ata_dev_enable_pm - enable SATA interface power management
967 * @dev: device to enable power management
968 * @policy: the link power management policy
970 * Enable SATA Interface power management. This will enable
971 * Device Interface Power Management (DIPM) for min_power
972 * policy, and then call driver specific callbacks for
973 * enabling Host Initiated Power management.
976 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
978 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
981 struct ata_port *ap = dev->link->ap;
983 /* set HIPM first, then DIPM */
984 if (ap->ops->enable_pm)
985 rc = ap->ops->enable_pm(ap, policy);
988 rc = ata_dev_set_dipm(dev, policy);
992 ap->pm_policy = MAX_PERFORMANCE;
994 ap->pm_policy = policy;
995 return /* rc */; /* hopefully we can use 'rc' eventually */
1000 * ata_dev_disable_pm - disable SATA interface power management
1001 * @dev: device to disable power management
1003 * Disable SATA Interface power management. This will disable
1004 * Device Interface Power Management (DIPM) without changing
1005 * policy, call driver specific callbacks for disabling Host
1006 * Initiated Power management.
1011 static void ata_dev_disable_pm(struct ata_device *dev)
1013 struct ata_port *ap = dev->link->ap;
1015 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
1016 if (ap->ops->disable_pm)
1017 ap->ops->disable_pm(ap);
1019 #endif /* CONFIG_PM */
1021 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
1023 ap->pm_policy = policy;
1024 ap->link.eh_info.action |= ATA_EH_LPM;
1025 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
1026 ata_port_schedule_eh(ap);
1030 static void ata_lpm_enable(struct ata_host *host)
1032 struct ata_link *link;
1033 struct ata_port *ap;
1034 struct ata_device *dev;
1037 for (i = 0; i < host->n_ports; i++) {
1038 ap = host->ports[i];
1039 ata_port_for_each_link(link, ap) {
1040 ata_link_for_each_dev(dev, link)
1041 ata_dev_disable_pm(dev);
1046 static void ata_lpm_disable(struct ata_host *host)
1050 for (i = 0; i < host->n_ports; i++) {
1051 struct ata_port *ap = host->ports[i];
1052 ata_lpm_schedule(ap, ap->pm_policy);
1055 #endif /* CONFIG_PM */
1058 * ata_dev_classify - determine device type based on ATA-spec signature
1059 * @tf: ATA taskfile register set for device to be identified
1061 * Determine from taskfile register contents whether a device is
1062 * ATA or ATAPI, as per "Signature and persistence" section
1063 * of ATA/PI spec (volume 1, sect 5.14).
1069 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
1070 * %ATA_DEV_UNKNOWN the event of failure.
1072 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1074 /* Apple's open source Darwin code hints that some devices only
1075 * put a proper signature into the LBA mid/high registers,
1076 * So, we only check those. It's sufficient for uniqueness.
1078 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1079 * signatures for ATA and ATAPI devices attached on SerialATA,
1080 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1081 * spec has never mentioned about using different signatures
1082 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1083 * Multiplier specification began to use 0x69/0x96 to identify
1084 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1085 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1086 * 0x69/0x96 shortly and described them as reserved for
1089 * We follow the current spec and consider that 0x69/0x96
1090 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1092 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1093 DPRINTK("found ATA device by sig\n");
1097 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1098 DPRINTK("found ATAPI device by sig\n");
1099 return ATA_DEV_ATAPI;
1102 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1103 DPRINTK("found PMP device by sig\n");
1107 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1108 printk(KERN_INFO "ata: SEMB device ignored\n");
1109 return ATA_DEV_SEMB_UNSUP; /* not yet */
1112 DPRINTK("unknown device\n");
1113 return ATA_DEV_UNKNOWN;
1117 * ata_id_string - Convert IDENTIFY DEVICE page into string
1118 * @id: IDENTIFY DEVICE results we will examine
1119 * @s: string into which data is output
1120 * @ofs: offset into identify device page
1121 * @len: length of string to return. must be an even number.
1123 * The strings in the IDENTIFY DEVICE page are broken up into
1124 * 16-bit chunks. Run through the string, and output each
1125 * 8-bit chunk linearly, regardless of platform.
1131 void ata_id_string(const u16 *id, unsigned char *s,
1132 unsigned int ofs, unsigned int len)
1151 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1152 * @id: IDENTIFY DEVICE results we will examine
1153 * @s: string into which data is output
1154 * @ofs: offset into identify device page
1155 * @len: length of string to return. must be an odd number.
1157 * This function is identical to ata_id_string except that it
1158 * trims trailing spaces and terminates the resulting string with
1159 * null. @len must be actual maximum length (even number) + 1.
1164 void ata_id_c_string(const u16 *id, unsigned char *s,
1165 unsigned int ofs, unsigned int len)
1169 WARN_ON(!(len & 1));
1171 ata_id_string(id, s, ofs, len - 1);
1173 p = s + strnlen(s, len - 1);
1174 while (p > s && p[-1] == ' ')
1179 static u64 ata_id_n_sectors(const u16 *id)
1181 if (ata_id_has_lba(id)) {
1182 if (ata_id_has_lba48(id))
1183 return ata_id_u64(id, 100);
1185 return ata_id_u32(id, 60);
1187 if (ata_id_current_chs_valid(id))
1188 return ata_id_u32(id, 57);
1190 return id[1] * id[3] * id[6];
1194 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1198 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1199 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1200 sectors |= (tf->hob_lbal & 0xff) << 24;
1201 sectors |= (tf->lbah & 0xff) << 16;
1202 sectors |= (tf->lbam & 0xff) << 8;
1203 sectors |= (tf->lbal & 0xff);
1208 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1212 sectors |= (tf->device & 0x0f) << 24;
1213 sectors |= (tf->lbah & 0xff) << 16;
1214 sectors |= (tf->lbam & 0xff) << 8;
1215 sectors |= (tf->lbal & 0xff);
1221 * ata_read_native_max_address - Read native max address
1222 * @dev: target device
1223 * @max_sectors: out parameter for the result native max address
1225 * Perform an LBA48 or LBA28 native size query upon the device in
1229 * 0 on success, -EACCES if command is aborted by the drive.
1230 * -EIO on other errors.
1232 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1234 unsigned int err_mask;
1235 struct ata_taskfile tf;
1236 int lba48 = ata_id_has_lba48(dev->id);
1238 ata_tf_init(dev, &tf);
1240 /* always clear all address registers */
1241 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1244 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1245 tf.flags |= ATA_TFLAG_LBA48;
1247 tf.command = ATA_CMD_READ_NATIVE_MAX;
1249 tf.protocol |= ATA_PROT_NODATA;
1250 tf.device |= ATA_LBA;
1252 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1254 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1255 "max address (err_mask=0x%x)\n", err_mask);
1256 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1262 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1264 *max_sectors = ata_tf_to_lba(&tf) + 1;
1265 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1271 * ata_set_max_sectors - Set max sectors
1272 * @dev: target device
1273 * @new_sectors: new max sectors value to set for the device
1275 * Set max sectors of @dev to @new_sectors.
1278 * 0 on success, -EACCES if command is aborted or denied (due to
1279 * previous non-volatile SET_MAX) by the drive. -EIO on other
1282 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1284 unsigned int err_mask;
1285 struct ata_taskfile tf;
1286 int lba48 = ata_id_has_lba48(dev->id);
1290 ata_tf_init(dev, &tf);
1292 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1295 tf.command = ATA_CMD_SET_MAX_EXT;
1296 tf.flags |= ATA_TFLAG_LBA48;
1298 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1299 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1300 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1302 tf.command = ATA_CMD_SET_MAX;
1304 tf.device |= (new_sectors >> 24) & 0xf;
1307 tf.protocol |= ATA_PROT_NODATA;
1308 tf.device |= ATA_LBA;
1310 tf.lbal = (new_sectors >> 0) & 0xff;
1311 tf.lbam = (new_sectors >> 8) & 0xff;
1312 tf.lbah = (new_sectors >> 16) & 0xff;
1314 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1316 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1317 "max address (err_mask=0x%x)\n", err_mask);
1318 if (err_mask == AC_ERR_DEV &&
1319 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1328 * ata_hpa_resize - Resize a device with an HPA set
1329 * @dev: Device to resize
1331 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1332 * it if required to the full size of the media. The caller must check
1333 * the drive has the HPA feature set enabled.
1336 * 0 on success, -errno on failure.
1338 static int ata_hpa_resize(struct ata_device *dev)
1340 struct ata_eh_context *ehc = &dev->link->eh_context;
1341 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1342 u64 sectors = ata_id_n_sectors(dev->id);
1346 /* do we need to do it? */
1347 if (dev->class != ATA_DEV_ATA ||
1348 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1349 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1352 /* read native max address */
1353 rc = ata_read_native_max_address(dev, &native_sectors);
1355 /* If device aborted the command or HPA isn't going to
1356 * be unlocked, skip HPA resizing.
1358 if (rc == -EACCES || !ata_ignore_hpa) {
1359 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1360 "broken, skipping HPA handling\n");
1361 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1363 /* we can continue if device aborted the command */
1371 /* nothing to do? */
1372 if (native_sectors <= sectors || !ata_ignore_hpa) {
1373 if (!print_info || native_sectors == sectors)
1376 if (native_sectors > sectors)
1377 ata_dev_printk(dev, KERN_INFO,
1378 "HPA detected: current %llu, native %llu\n",
1379 (unsigned long long)sectors,
1380 (unsigned long long)native_sectors);
1381 else if (native_sectors < sectors)
1382 ata_dev_printk(dev, KERN_WARNING,
1383 "native sectors (%llu) is smaller than "
1385 (unsigned long long)native_sectors,
1386 (unsigned long long)sectors);
1390 /* let's unlock HPA */
1391 rc = ata_set_max_sectors(dev, native_sectors);
1392 if (rc == -EACCES) {
1393 /* if device aborted the command, skip HPA resizing */
1394 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1395 "(%llu -> %llu), skipping HPA handling\n",
1396 (unsigned long long)sectors,
1397 (unsigned long long)native_sectors);
1398 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1403 /* re-read IDENTIFY data */
1404 rc = ata_dev_reread_id(dev, 0);
1406 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1407 "data after HPA resizing\n");
1412 u64 new_sectors = ata_id_n_sectors(dev->id);
1413 ata_dev_printk(dev, KERN_INFO,
1414 "HPA unlocked: %llu -> %llu, native %llu\n",
1415 (unsigned long long)sectors,
1416 (unsigned long long)new_sectors,
1417 (unsigned long long)native_sectors);
1424 * ata_dump_id - IDENTIFY DEVICE info debugging output
1425 * @id: IDENTIFY DEVICE page to dump
1427 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1434 static inline void ata_dump_id(const u16 *id)
1436 DPRINTK("49==0x%04x "
1446 DPRINTK("80==0x%04x "
1456 DPRINTK("88==0x%04x "
1463 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1464 * @id: IDENTIFY data to compute xfer mask from
1466 * Compute the xfermask for this device. This is not as trivial
1467 * as it seems if we must consider early devices correctly.
1469 * FIXME: pre IDE drive timing (do we care ?).
1477 unsigned long ata_id_xfermask(const u16 *id)
1479 unsigned long pio_mask, mwdma_mask, udma_mask;
1481 /* Usual case. Word 53 indicates word 64 is valid */
1482 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1483 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1487 /* If word 64 isn't valid then Word 51 high byte holds
1488 * the PIO timing number for the maximum. Turn it into
1491 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1492 if (mode < 5) /* Valid PIO range */
1493 pio_mask = (2 << mode) - 1;
1497 /* But wait.. there's more. Design your standards by
1498 * committee and you too can get a free iordy field to
1499 * process. However its the speeds not the modes that
1500 * are supported... Note drivers using the timing API
1501 * will get this right anyway
1505 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1507 if (ata_id_is_cfa(id)) {
1509 * Process compact flash extended modes
1511 int pio = id[163] & 0x7;
1512 int dma = (id[163] >> 3) & 7;
1515 pio_mask |= (1 << 5);
1517 pio_mask |= (1 << 6);
1519 mwdma_mask |= (1 << 3);
1521 mwdma_mask |= (1 << 4);
1525 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1526 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1528 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1532 * ata_pio_queue_task - Queue port_task
1533 * @ap: The ata_port to queue port_task for
1534 * @fn: workqueue function to be scheduled
1535 * @data: data for @fn to use
1536 * @delay: delay time for workqueue function
1538 * Schedule @fn(@data) for execution after @delay jiffies using
1539 * port_task. There is one port_task per port and it's the
1540 * user(low level driver)'s responsibility to make sure that only
1541 * one task is active at any given time.
1543 * libata core layer takes care of synchronization between
1544 * port_task and EH. ata_pio_queue_task() may be ignored for EH
1548 * Inherited from caller.
1550 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
1552 ap->port_task_data = data;
1554 /* may fail if ata_port_flush_task() in progress */
1555 queue_delayed_work(ata_wq, &ap->port_task, delay);
1559 * ata_port_flush_task - Flush port_task
1560 * @ap: The ata_port to flush port_task for
1562 * After this function completes, port_task is guranteed not to
1563 * be running or scheduled.
1566 * Kernel thread context (may sleep)
1568 void ata_port_flush_task(struct ata_port *ap)
1572 cancel_rearming_delayed_work(&ap->port_task);
1574 if (ata_msg_ctl(ap))
1575 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
1578 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1580 struct completion *waiting = qc->private_data;
1586 * ata_exec_internal_sg - execute libata internal command
1587 * @dev: Device to which the command is sent
1588 * @tf: Taskfile registers for the command and the result
1589 * @cdb: CDB for packet command
1590 * @dma_dir: Data tranfer direction of the command
1591 * @sgl: sg list for the data buffer of the command
1592 * @n_elem: Number of sg entries
1593 * @timeout: Timeout in msecs (0 for default)
1595 * Executes libata internal command with timeout. @tf contains
1596 * command on entry and result on return. Timeout and error
1597 * conditions are reported via return value. No recovery action
1598 * is taken after a command times out. It's caller's duty to
1599 * clean up after timeout.
1602 * None. Should be called with kernel context, might sleep.
1605 * Zero on success, AC_ERR_* mask on failure
1607 unsigned ata_exec_internal_sg(struct ata_device *dev,
1608 struct ata_taskfile *tf, const u8 *cdb,
1609 int dma_dir, struct scatterlist *sgl,
1610 unsigned int n_elem, unsigned long timeout)
1612 struct ata_link *link = dev->link;
1613 struct ata_port *ap = link->ap;
1614 u8 command = tf->command;
1615 struct ata_queued_cmd *qc;
1616 unsigned int tag, preempted_tag;
1617 u32 preempted_sactive, preempted_qc_active;
1618 int preempted_nr_active_links;
1619 DECLARE_COMPLETION_ONSTACK(wait);
1620 unsigned long flags;
1621 unsigned int err_mask;
1624 spin_lock_irqsave(ap->lock, flags);
1626 /* no internal command while frozen */
1627 if (ap->pflags & ATA_PFLAG_FROZEN) {
1628 spin_unlock_irqrestore(ap->lock, flags);
1629 return AC_ERR_SYSTEM;
1632 /* initialize internal qc */
1634 /* XXX: Tag 0 is used for drivers with legacy EH as some
1635 * drivers choke if any other tag is given. This breaks
1636 * ata_tag_internal() test for those drivers. Don't use new
1637 * EH stuff without converting to it.
1639 if (ap->ops->error_handler)
1640 tag = ATA_TAG_INTERNAL;
1644 if (test_and_set_bit(tag, &ap->qc_allocated))
1646 qc = __ata_qc_from_tag(ap, tag);
1654 preempted_tag = link->active_tag;
1655 preempted_sactive = link->sactive;
1656 preempted_qc_active = ap->qc_active;
1657 preempted_nr_active_links = ap->nr_active_links;
1658 link->active_tag = ATA_TAG_POISON;
1661 ap->nr_active_links = 0;
1663 /* prepare & issue qc */
1666 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1667 qc->flags |= ATA_QCFLAG_RESULT_TF;
1668 qc->dma_dir = dma_dir;
1669 if (dma_dir != DMA_NONE) {
1670 unsigned int i, buflen = 0;
1671 struct scatterlist *sg;
1673 for_each_sg(sgl, sg, n_elem, i)
1674 buflen += sg->length;
1676 ata_sg_init(qc, sgl, n_elem);
1677 qc->nbytes = buflen;
1680 qc->private_data = &wait;
1681 qc->complete_fn = ata_qc_complete_internal;
1685 spin_unlock_irqrestore(ap->lock, flags);
1688 timeout = ata_probe_timeout * 1000 / HZ;
1690 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1692 ata_port_flush_task(ap);
1695 spin_lock_irqsave(ap->lock, flags);
1697 /* We're racing with irq here. If we lose, the
1698 * following test prevents us from completing the qc
1699 * twice. If we win, the port is frozen and will be
1700 * cleaned up by ->post_internal_cmd().
1702 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1703 qc->err_mask |= AC_ERR_TIMEOUT;
1705 if (ap->ops->error_handler)
1706 ata_port_freeze(ap);
1708 ata_qc_complete(qc);
1710 if (ata_msg_warn(ap))
1711 ata_dev_printk(dev, KERN_WARNING,
1712 "qc timeout (cmd 0x%x)\n", command);
1715 spin_unlock_irqrestore(ap->lock, flags);
1718 /* do post_internal_cmd */
1719 if (ap->ops->post_internal_cmd)
1720 ap->ops->post_internal_cmd(qc);
1722 /* perform minimal error analysis */
1723 if (qc->flags & ATA_QCFLAG_FAILED) {
1724 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1725 qc->err_mask |= AC_ERR_DEV;
1728 qc->err_mask |= AC_ERR_OTHER;
1730 if (qc->err_mask & ~AC_ERR_OTHER)
1731 qc->err_mask &= ~AC_ERR_OTHER;
1735 spin_lock_irqsave(ap->lock, flags);
1737 *tf = qc->result_tf;
1738 err_mask = qc->err_mask;
1741 link->active_tag = preempted_tag;
1742 link->sactive = preempted_sactive;
1743 ap->qc_active = preempted_qc_active;
1744 ap->nr_active_links = preempted_nr_active_links;
1746 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1747 * Until those drivers are fixed, we detect the condition
1748 * here, fail the command with AC_ERR_SYSTEM and reenable the
1751 * Note that this doesn't change any behavior as internal
1752 * command failure results in disabling the device in the
1753 * higher layer for LLDDs without new reset/EH callbacks.
1755 * Kill the following code as soon as those drivers are fixed.
1757 if (ap->flags & ATA_FLAG_DISABLED) {
1758 err_mask |= AC_ERR_SYSTEM;
1762 spin_unlock_irqrestore(ap->lock, flags);
1768 * ata_exec_internal - execute libata internal command
1769 * @dev: Device to which the command is sent
1770 * @tf: Taskfile registers for the command and the result
1771 * @cdb: CDB for packet command
1772 * @dma_dir: Data tranfer direction of the command
1773 * @buf: Data buffer of the command
1774 * @buflen: Length of data buffer
1775 * @timeout: Timeout in msecs (0 for default)
1777 * Wrapper around ata_exec_internal_sg() which takes simple
1778 * buffer instead of sg list.
1781 * None. Should be called with kernel context, might sleep.
1784 * Zero on success, AC_ERR_* mask on failure
1786 unsigned ata_exec_internal(struct ata_device *dev,
1787 struct ata_taskfile *tf, const u8 *cdb,
1788 int dma_dir, void *buf, unsigned int buflen,
1789 unsigned long timeout)
1791 struct scatterlist *psg = NULL, sg;
1792 unsigned int n_elem = 0;
1794 if (dma_dir != DMA_NONE) {
1796 sg_init_one(&sg, buf, buflen);
1801 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1806 * ata_do_simple_cmd - execute simple internal command
1807 * @dev: Device to which the command is sent
1808 * @cmd: Opcode to execute
1810 * Execute a 'simple' command, that only consists of the opcode
1811 * 'cmd' itself, without filling any other registers
1814 * Kernel thread context (may sleep).
1817 * Zero on success, AC_ERR_* mask on failure
1819 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1821 struct ata_taskfile tf;
1823 ata_tf_init(dev, &tf);
1826 tf.flags |= ATA_TFLAG_DEVICE;
1827 tf.protocol = ATA_PROT_NODATA;
1829 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1833 * ata_pio_need_iordy - check if iordy needed
1836 * Check if the current speed of the device requires IORDY. Used
1837 * by various controllers for chip configuration.
1840 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1842 /* Controller doesn't support IORDY. Probably a pointless check
1843 as the caller should know this */
1844 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1846 /* PIO3 and higher it is mandatory */
1847 if (adev->pio_mode > XFER_PIO_2)
1849 /* We turn it on when possible */
1850 if (ata_id_has_iordy(adev->id))
1856 * ata_pio_mask_no_iordy - Return the non IORDY mask
1859 * Compute the highest mode possible if we are not using iordy. Return
1860 * -1 if no iordy mode is available.
1863 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1865 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1866 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1867 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1868 /* Is the speed faster than the drive allows non IORDY ? */
1870 /* This is cycle times not frequency - watch the logic! */
1871 if (pio > 240) /* PIO2 is 240nS per cycle */
1872 return 3 << ATA_SHIFT_PIO;
1873 return 7 << ATA_SHIFT_PIO;
1876 return 3 << ATA_SHIFT_PIO;
1880 * ata_dev_read_id - Read ID data from the specified device
1881 * @dev: target device
1882 * @p_class: pointer to class of the target device (may be changed)
1883 * @flags: ATA_READID_* flags
1884 * @id: buffer to read IDENTIFY data into
1886 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1887 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1888 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1889 * for pre-ATA4 drives.
1891 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1892 * now we abort if we hit that case.
1895 * Kernel thread context (may sleep)
1898 * 0 on success, -errno otherwise.
1900 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1901 unsigned int flags, u16 *id)
1903 struct ata_port *ap = dev->link->ap;
1904 unsigned int class = *p_class;
1905 struct ata_taskfile tf;
1906 unsigned int err_mask = 0;
1908 int may_fallback = 1, tried_spinup = 0;
1911 if (ata_msg_ctl(ap))
1912 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
1915 ata_tf_init(dev, &tf);
1919 tf.command = ATA_CMD_ID_ATA;
1922 tf.command = ATA_CMD_ID_ATAPI;
1926 reason = "unsupported class";
1930 tf.protocol = ATA_PROT_PIO;
1932 /* Some devices choke if TF registers contain garbage. Make
1933 * sure those are properly initialized.
1935 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1937 /* Device presence detection is unreliable on some
1938 * controllers. Always poll IDENTIFY if available.
1940 tf.flags |= ATA_TFLAG_POLLING;
1942 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1943 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1945 if (err_mask & AC_ERR_NODEV_HINT) {
1946 ata_dev_printk(dev, KERN_DEBUG,
1947 "NODEV after polling detection\n");
1951 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1952 /* Device or controller might have reported
1953 * the wrong device class. Give a shot at the
1954 * other IDENTIFY if the current one is
1955 * aborted by the device.
1960 if (class == ATA_DEV_ATA)
1961 class = ATA_DEV_ATAPI;
1963 class = ATA_DEV_ATA;
1967 /* Control reaches here iff the device aborted
1968 * both flavors of IDENTIFYs which happens
1969 * sometimes with phantom devices.
1971 ata_dev_printk(dev, KERN_DEBUG,
1972 "both IDENTIFYs aborted, assuming NODEV\n");
1977 reason = "I/O error";
1981 /* Falling back doesn't make sense if ID data was read
1982 * successfully at least once.
1986 swap_buf_le16(id, ATA_ID_WORDS);
1990 reason = "device reports invalid type";
1992 if (class == ATA_DEV_ATA) {
1993 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1996 if (ata_id_is_ata(id))
2000 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
2003 * Drive powered-up in standby mode, and requires a specific
2004 * SET_FEATURES spin-up subcommand before it will accept
2005 * anything other than the original IDENTIFY command.
2007 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2008 if (err_mask && id[2] != 0x738c) {
2010 reason = "SPINUP failed";
2014 * If the drive initially returned incomplete IDENTIFY info,
2015 * we now must reissue the IDENTIFY command.
2017 if (id[2] == 0x37c8)
2021 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2023 * The exact sequence expected by certain pre-ATA4 drives is:
2025 * IDENTIFY (optional in early ATA)
2026 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2028 * Some drives were very specific about that exact sequence.
2030 * Note that ATA4 says lba is mandatory so the second check
2031 * shoud never trigger.
2033 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2034 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2037 reason = "INIT_DEV_PARAMS failed";
2041 /* current CHS translation info (id[53-58]) might be
2042 * changed. reread the identify device info.
2044 flags &= ~ATA_READID_POSTRESET;
2054 if (ata_msg_warn(ap))
2055 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2056 "(%s, err_mask=0x%x)\n", reason, err_mask);
2060 static inline u8 ata_dev_knobble(struct ata_device *dev)
2062 struct ata_port *ap = dev->link->ap;
2063 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2066 static void ata_dev_config_ncq(struct ata_device *dev,
2067 char *desc, size_t desc_sz)
2069 struct ata_port *ap = dev->link->ap;
2070 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2072 if (!ata_id_has_ncq(dev->id)) {
2076 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2077 snprintf(desc, desc_sz, "NCQ (not used)");
2080 if (ap->flags & ATA_FLAG_NCQ) {
2081 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2082 dev->flags |= ATA_DFLAG_NCQ;
2085 if (hdepth >= ddepth)
2086 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2088 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2092 * ata_dev_configure - Configure the specified ATA/ATAPI device
2093 * @dev: Target device to configure
2095 * Configure @dev according to @dev->id. Generic and low-level
2096 * driver specific fixups are also applied.
2099 * Kernel thread context (may sleep)
2102 * 0 on success, -errno otherwise
2104 int ata_dev_configure(struct ata_device *dev)
2106 struct ata_port *ap = dev->link->ap;
2107 struct ata_eh_context *ehc = &dev->link->eh_context;
2108 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2109 const u16 *id = dev->id;
2110 unsigned long xfer_mask;
2111 char revbuf[7]; /* XYZ-99\0 */
2112 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2113 char modelbuf[ATA_ID_PROD_LEN+1];
2116 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2117 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2122 if (ata_msg_probe(ap))
2123 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2126 dev->horkage |= ata_dev_blacklisted(dev);
2127 ata_force_horkage(dev);
2129 /* let ACPI work its magic */
2130 rc = ata_acpi_on_devcfg(dev);
2134 /* massage HPA, do it early as it might change IDENTIFY data */
2135 rc = ata_hpa_resize(dev);
2139 /* print device capabilities */
2140 if (ata_msg_probe(ap))
2141 ata_dev_printk(dev, KERN_DEBUG,
2142 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2143 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2145 id[49], id[82], id[83], id[84],
2146 id[85], id[86], id[87], id[88]);
2148 /* initialize to-be-configured parameters */
2149 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2150 dev->max_sectors = 0;
2158 * common ATA, ATAPI feature tests
2161 /* find max transfer mode; for printk only */
2162 xfer_mask = ata_id_xfermask(id);
2164 if (ata_msg_probe(ap))
2167 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2168 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2171 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2174 /* ATA-specific feature tests */
2175 if (dev->class == ATA_DEV_ATA) {
2176 if (ata_id_is_cfa(id)) {
2177 if (id[162] & 1) /* CPRM may make this media unusable */
2178 ata_dev_printk(dev, KERN_WARNING,
2179 "supports DRM functions and may "
2180 "not be fully accessable.\n");
2181 snprintf(revbuf, 7, "CFA");
2183 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2184 /* Warn the user if the device has TPM extensions */
2185 if (ata_id_has_tpm(id))
2186 ata_dev_printk(dev, KERN_WARNING,
2187 "supports DRM functions and may "
2188 "not be fully accessable.\n");
2191 dev->n_sectors = ata_id_n_sectors(id);
2193 if (dev->id[59] & 0x100)
2194 dev->multi_count = dev->id[59] & 0xff;
2196 if (ata_id_has_lba(id)) {
2197 const char *lba_desc;
2201 dev->flags |= ATA_DFLAG_LBA;
2202 if (ata_id_has_lba48(id)) {
2203 dev->flags |= ATA_DFLAG_LBA48;
2206 if (dev->n_sectors >= (1UL << 28) &&
2207 ata_id_has_flush_ext(id))
2208 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2212 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2214 /* print device info to dmesg */
2215 if (ata_msg_drv(ap) && print_info) {
2216 ata_dev_printk(dev, KERN_INFO,
2217 "%s: %s, %s, max %s\n",
2218 revbuf, modelbuf, fwrevbuf,
2219 ata_mode_string(xfer_mask));
2220 ata_dev_printk(dev, KERN_INFO,
2221 "%Lu sectors, multi %u: %s %s\n",
2222 (unsigned long long)dev->n_sectors,
2223 dev->multi_count, lba_desc, ncq_desc);
2228 /* Default translation */
2229 dev->cylinders = id[1];
2231 dev->sectors = id[6];
2233 if (ata_id_current_chs_valid(id)) {
2234 /* Current CHS translation is valid. */
2235 dev->cylinders = id[54];
2236 dev->heads = id[55];
2237 dev->sectors = id[56];
2240 /* print device info to dmesg */
2241 if (ata_msg_drv(ap) && print_info) {
2242 ata_dev_printk(dev, KERN_INFO,
2243 "%s: %s, %s, max %s\n",
2244 revbuf, modelbuf, fwrevbuf,
2245 ata_mode_string(xfer_mask));
2246 ata_dev_printk(dev, KERN_INFO,
2247 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2248 (unsigned long long)dev->n_sectors,
2249 dev->multi_count, dev->cylinders,
2250 dev->heads, dev->sectors);
2257 /* ATAPI-specific feature tests */
2258 else if (dev->class == ATA_DEV_ATAPI) {
2259 const char *cdb_intr_string = "";
2260 const char *atapi_an_string = "";
2261 const char *dma_dir_string = "";
2264 rc = atapi_cdb_len(id);
2265 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2266 if (ata_msg_warn(ap))
2267 ata_dev_printk(dev, KERN_WARNING,
2268 "unsupported CDB len\n");
2272 dev->cdb_len = (unsigned int) rc;
2274 /* Enable ATAPI AN if both the host and device have
2275 * the support. If PMP is attached, SNTF is required
2276 * to enable ATAPI AN to discern between PHY status
2277 * changed notifications and ATAPI ANs.
2279 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2280 (!sata_pmp_attached(ap) ||
2281 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2282 unsigned int err_mask;
2284 /* issue SET feature command to turn this on */
2285 err_mask = ata_dev_set_feature(dev,
2286 SETFEATURES_SATA_ENABLE, SATA_AN);
2288 ata_dev_printk(dev, KERN_ERR,
2289 "failed to enable ATAPI AN "
2290 "(err_mask=0x%x)\n", err_mask);
2292 dev->flags |= ATA_DFLAG_AN;
2293 atapi_an_string = ", ATAPI AN";
2297 if (ata_id_cdb_intr(dev->id)) {
2298 dev->flags |= ATA_DFLAG_CDB_INTR;
2299 cdb_intr_string = ", CDB intr";
2302 if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
2303 dev->flags |= ATA_DFLAG_DMADIR;
2304 dma_dir_string = ", DMADIR";
2307 /* print device info to dmesg */
2308 if (ata_msg_drv(ap) && print_info)
2309 ata_dev_printk(dev, KERN_INFO,
2310 "ATAPI: %s, %s, max %s%s%s%s\n",
2312 ata_mode_string(xfer_mask),
2313 cdb_intr_string, atapi_an_string,
2317 /* determine max_sectors */
2318 dev->max_sectors = ATA_MAX_SECTORS;
2319 if (dev->flags & ATA_DFLAG_LBA48)
2320 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2322 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2323 if (ata_id_has_hipm(dev->id))
2324 dev->flags |= ATA_DFLAG_HIPM;
2325 if (ata_id_has_dipm(dev->id))
2326 dev->flags |= ATA_DFLAG_DIPM;
2329 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2331 if (ata_dev_knobble(dev)) {
2332 if (ata_msg_drv(ap) && print_info)
2333 ata_dev_printk(dev, KERN_INFO,
2334 "applying bridge limits\n");
2335 dev->udma_mask &= ATA_UDMA5;
2336 dev->max_sectors = ATA_MAX_SECTORS;
2339 if ((dev->class == ATA_DEV_ATAPI) &&
2340 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2341 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2342 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2345 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2346 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2349 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2350 dev->horkage |= ATA_HORKAGE_IPM;
2352 /* reset link pm_policy for this port to no pm */
2353 ap->pm_policy = MAX_PERFORMANCE;
2356 if (ap->ops->dev_config)
2357 ap->ops->dev_config(dev);
2359 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2360 /* Let the user know. We don't want to disallow opens for
2361 rescue purposes, or in case the vendor is just a blithering
2362 idiot. Do this after the dev_config call as some controllers
2363 with buggy firmware may want to avoid reporting false device
2367 ata_dev_printk(dev, KERN_WARNING,
2368 "Drive reports diagnostics failure. This may indicate a drive\n");
2369 ata_dev_printk(dev, KERN_WARNING,
2370 "fault or invalid emulation. Contact drive vendor for information.\n");
2377 if (ata_msg_probe(ap))
2378 ata_dev_printk(dev, KERN_DEBUG,
2379 "%s: EXIT, err\n", __func__);
2384 * ata_cable_40wire - return 40 wire cable type
2387 * Helper method for drivers which want to hardwire 40 wire cable
2391 int ata_cable_40wire(struct ata_port *ap)
2393 return ATA_CBL_PATA40;
2397 * ata_cable_80wire - return 80 wire cable type
2400 * Helper method for drivers which want to hardwire 80 wire cable
2404 int ata_cable_80wire(struct ata_port *ap)
2406 return ATA_CBL_PATA80;
2410 * ata_cable_unknown - return unknown PATA cable.
2413 * Helper method for drivers which have no PATA cable detection.
2416 int ata_cable_unknown(struct ata_port *ap)
2418 return ATA_CBL_PATA_UNK;
2422 * ata_cable_ignore - return ignored PATA cable.
2425 * Helper method for drivers which don't use cable type to limit
2428 int ata_cable_ignore(struct ata_port *ap)
2430 return ATA_CBL_PATA_IGN;
2434 * ata_cable_sata - return SATA cable type
2437 * Helper method for drivers which have SATA cables
2440 int ata_cable_sata(struct ata_port *ap)
2442 return ATA_CBL_SATA;
2446 * ata_bus_probe - Reset and probe ATA bus
2449 * Master ATA bus probing function. Initiates a hardware-dependent
2450 * bus reset, then attempts to identify any devices found on
2454 * PCI/etc. bus probe sem.
2457 * Zero on success, negative errno otherwise.
2460 int ata_bus_probe(struct ata_port *ap)
2462 unsigned int classes[ATA_MAX_DEVICES];
2463 int tries[ATA_MAX_DEVICES];
2465 struct ata_device *dev;
2469 ata_link_for_each_dev(dev, &ap->link)
2470 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2473 ata_link_for_each_dev(dev, &ap->link) {
2474 /* If we issue an SRST then an ATA drive (not ATAPI)
2475 * may change configuration and be in PIO0 timing. If
2476 * we do a hard reset (or are coming from power on)
2477 * this is true for ATA or ATAPI. Until we've set a
2478 * suitable controller mode we should not touch the
2479 * bus as we may be talking too fast.
2481 dev->pio_mode = XFER_PIO_0;
2483 /* If the controller has a pio mode setup function
2484 * then use it to set the chipset to rights. Don't
2485 * touch the DMA setup as that will be dealt with when
2486 * configuring devices.
2488 if (ap->ops->set_piomode)
2489 ap->ops->set_piomode(ap, dev);
2492 /* reset and determine device classes */
2493 ap->ops->phy_reset(ap);
2495 ata_link_for_each_dev(dev, &ap->link) {
2496 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2497 dev->class != ATA_DEV_UNKNOWN)
2498 classes[dev->devno] = dev->class;
2500 classes[dev->devno] = ATA_DEV_NONE;
2502 dev->class = ATA_DEV_UNKNOWN;
2507 /* read IDENTIFY page and configure devices. We have to do the identify
2508 specific sequence bass-ackwards so that PDIAG- is released by
2511 ata_link_for_each_dev_reverse(dev, &ap->link) {
2512 if (tries[dev->devno])
2513 dev->class = classes[dev->devno];
2515 if (!ata_dev_enabled(dev))
2518 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2524 /* Now ask for the cable type as PDIAG- should have been released */
2525 if (ap->ops->cable_detect)
2526 ap->cbl = ap->ops->cable_detect(ap);
2528 /* We may have SATA bridge glue hiding here irrespective of the
2529 reported cable types and sensed types */
2530 ata_link_for_each_dev(dev, &ap->link) {
2531 if (!ata_dev_enabled(dev))
2533 /* SATA drives indicate we have a bridge. We don't know which
2534 end of the link the bridge is which is a problem */
2535 if (ata_id_is_sata(dev->id))
2536 ap->cbl = ATA_CBL_SATA;
2539 /* After the identify sequence we can now set up the devices. We do
2540 this in the normal order so that the user doesn't get confused */
2542 ata_link_for_each_dev(dev, &ap->link) {
2543 if (!ata_dev_enabled(dev))
2546 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2547 rc = ata_dev_configure(dev);
2548 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2553 /* configure transfer mode */
2554 rc = ata_set_mode(&ap->link, &dev);
2558 ata_link_for_each_dev(dev, &ap->link)
2559 if (ata_dev_enabled(dev))
2562 /* no device present, disable port */
2563 ata_port_disable(ap);
2567 tries[dev->devno]--;
2571 /* eeek, something went very wrong, give up */
2572 tries[dev->devno] = 0;
2576 /* give it just one more chance */
2577 tries[dev->devno] = min(tries[dev->devno], 1);
2579 if (tries[dev->devno] == 1) {
2580 /* This is the last chance, better to slow
2581 * down than lose it.
2583 sata_down_spd_limit(&ap->link);
2584 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2588 if (!tries[dev->devno])
2589 ata_dev_disable(dev);
2595 * ata_port_probe - Mark port as enabled
2596 * @ap: Port for which we indicate enablement
2598 * Modify @ap data structure such that the system
2599 * thinks that the entire port is enabled.
2601 * LOCKING: host lock, or some other form of
2605 void ata_port_probe(struct ata_port *ap)
2607 ap->flags &= ~ATA_FLAG_DISABLED;
2611 * sata_print_link_status - Print SATA link status
2612 * @link: SATA link to printk link status about
2614 * This function prints link speed and status of a SATA link.
2619 static void sata_print_link_status(struct ata_link *link)
2621 u32 sstatus, scontrol, tmp;
2623 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2625 sata_scr_read(link, SCR_CONTROL, &scontrol);
2627 if (ata_link_online(link)) {
2628 tmp = (sstatus >> 4) & 0xf;
2629 ata_link_printk(link, KERN_INFO,
2630 "SATA link up %s (SStatus %X SControl %X)\n",
2631 sata_spd_string(tmp), sstatus, scontrol);
2633 ata_link_printk(link, KERN_INFO,
2634 "SATA link down (SStatus %X SControl %X)\n",
2640 * ata_dev_pair - return other device on cable
2643 * Obtain the other device on the same cable, or if none is
2644 * present NULL is returned
2647 struct ata_device *ata_dev_pair(struct ata_device *adev)
2649 struct ata_link *link = adev->link;
2650 struct ata_device *pair = &link->device[1 - adev->devno];
2651 if (!ata_dev_enabled(pair))
2657 * ata_port_disable - Disable port.
2658 * @ap: Port to be disabled.
2660 * Modify @ap data structure such that the system
2661 * thinks that the entire port is disabled, and should
2662 * never attempt to probe or communicate with devices
2665 * LOCKING: host lock, or some other form of
2669 void ata_port_disable(struct ata_port *ap)
2671 ap->link.device[0].class = ATA_DEV_NONE;
2672 ap->link.device[1].class = ATA_DEV_NONE;
2673 ap->flags |= ATA_FLAG_DISABLED;
2677 * sata_down_spd_limit - adjust SATA spd limit downward
2678 * @link: Link to adjust SATA spd limit for
2680 * Adjust SATA spd limit of @link downward. Note that this
2681 * function only adjusts the limit. The change must be applied
2682 * using sata_set_spd().
2685 * Inherited from caller.
2688 * 0 on success, negative errno on failure
2690 int sata_down_spd_limit(struct ata_link *link)
2692 u32 sstatus, spd, mask;
2695 if (!sata_scr_valid(link))
2698 /* If SCR can be read, use it to determine the current SPD.
2699 * If not, use cached value in link->sata_spd.
2701 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2703 spd = (sstatus >> 4) & 0xf;
2705 spd = link->sata_spd;
2707 mask = link->sata_spd_limit;
2711 /* unconditionally mask off the highest bit */
2712 highbit = fls(mask) - 1;
2713 mask &= ~(1 << highbit);
2715 /* Mask off all speeds higher than or equal to the current
2716 * one. Force 1.5Gbps if current SPD is not available.
2719 mask &= (1 << (spd - 1)) - 1;
2723 /* were we already at the bottom? */
2727 link->sata_spd_limit = mask;
2729 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2730 sata_spd_string(fls(mask)));
2735 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2737 struct ata_link *host_link = &link->ap->link;
2738 u32 limit, target, spd;
2740 limit = link->sata_spd_limit;
2742 /* Don't configure downstream link faster than upstream link.
2743 * It doesn't speed up anything and some PMPs choke on such
2746 if (!ata_is_host_link(link) && host_link->sata_spd)
2747 limit &= (1 << host_link->sata_spd) - 1;
2749 if (limit == UINT_MAX)
2752 target = fls(limit);
2754 spd = (*scontrol >> 4) & 0xf;
2755 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2757 return spd != target;
2761 * sata_set_spd_needed - is SATA spd configuration needed
2762 * @link: Link in question
2764 * Test whether the spd limit in SControl matches
2765 * @link->sata_spd_limit. This function is used to determine
2766 * whether hardreset is necessary to apply SATA spd
2770 * Inherited from caller.
2773 * 1 if SATA spd configuration is needed, 0 otherwise.
2775 static int sata_set_spd_needed(struct ata_link *link)
2779 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2782 return __sata_set_spd_needed(link, &scontrol);
2786 * sata_set_spd - set SATA spd according to spd limit
2787 * @link: Link to set SATA spd for
2789 * Set SATA spd of @link according to sata_spd_limit.
2792 * Inherited from caller.
2795 * 0 if spd doesn't need to be changed, 1 if spd has been
2796 * changed. Negative errno if SCR registers are inaccessible.
2798 int sata_set_spd(struct ata_link *link)
2803 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2806 if (!__sata_set_spd_needed(link, &scontrol))
2809 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2816 * This mode timing computation functionality is ported over from
2817 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2820 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2821 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2822 * for UDMA6, which is currently supported only by Maxtor drives.
2824 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2827 static const struct ata_timing ata_timing[] = {
2828 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2829 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2830 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2831 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2832 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2833 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2834 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2835 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2837 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2838 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2839 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2841 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2842 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2843 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2844 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2845 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2847 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2848 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2849 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2850 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2851 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2852 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2853 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2854 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2859 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2860 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2862 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2864 q->setup = EZ(t->setup * 1000, T);
2865 q->act8b = EZ(t->act8b * 1000, T);
2866 q->rec8b = EZ(t->rec8b * 1000, T);
2867 q->cyc8b = EZ(t->cyc8b * 1000, T);
2868 q->active = EZ(t->active * 1000, T);
2869 q->recover = EZ(t->recover * 1000, T);
2870 q->cycle = EZ(t->cycle * 1000, T);
2871 q->udma = EZ(t->udma * 1000, UT);
2874 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2875 struct ata_timing *m, unsigned int what)
2877 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2878 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2879 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2880 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2881 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2882 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2883 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2884 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2887 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
2889 const struct ata_timing *t = ata_timing;
2891 while (xfer_mode > t->mode)
2894 if (xfer_mode == t->mode)
2899 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2900 struct ata_timing *t, int T, int UT)
2902 const struct ata_timing *s;
2903 struct ata_timing p;
2909 if (!(s = ata_timing_find_mode(speed)))
2912 memcpy(t, s, sizeof(*s));
2915 * If the drive is an EIDE drive, it can tell us it needs extended
2916 * PIO/MW_DMA cycle timing.
2919 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2920 memset(&p, 0, sizeof(p));
2921 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2922 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2923 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2924 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2925 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2927 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2931 * Convert the timing to bus clock counts.
2934 ata_timing_quantize(t, t, T, UT);
2937 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2938 * S.M.A.R.T * and some other commands. We have to ensure that the
2939 * DMA cycle timing is slower/equal than the fastest PIO timing.
2942 if (speed > XFER_PIO_6) {
2943 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2944 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2948 * Lengthen active & recovery time so that cycle time is correct.
2951 if (t->act8b + t->rec8b < t->cyc8b) {
2952 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2953 t->rec8b = t->cyc8b - t->act8b;
2956 if (t->active + t->recover < t->cycle) {
2957 t->active += (t->cycle - (t->active + t->recover)) / 2;
2958 t->recover = t->cycle - t->active;
2961 /* In a few cases quantisation may produce enough errors to
2962 leave t->cycle too low for the sum of active and recovery
2963 if so we must correct this */
2964 if (t->active + t->recover > t->cycle)
2965 t->cycle = t->active + t->recover;
2971 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
2972 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
2973 * @cycle: cycle duration in ns
2975 * Return matching xfer mode for @cycle. The returned mode is of
2976 * the transfer type specified by @xfer_shift. If @cycle is too
2977 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
2978 * than the fastest known mode, the fasted mode is returned.
2984 * Matching xfer_mode, 0xff if no match found.
2986 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
2988 u8 base_mode = 0xff, last_mode = 0xff;
2989 const struct ata_xfer_ent *ent;
2990 const struct ata_timing *t;
2992 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
2993 if (ent->shift == xfer_shift)
2994 base_mode = ent->base;
2996 for (t = ata_timing_find_mode(base_mode);
2997 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
2998 unsigned short this_cycle;
3000 switch (xfer_shift) {
3002 case ATA_SHIFT_MWDMA:
3003 this_cycle = t->cycle;
3005 case ATA_SHIFT_UDMA:
3006 this_cycle = t->udma;
3012 if (cycle > this_cycle)
3015 last_mode = t->mode;
3022 * ata_down_xfermask_limit - adjust dev xfer masks downward
3023 * @dev: Device to adjust xfer masks
3024 * @sel: ATA_DNXFER_* selector
3026 * Adjust xfer masks of @dev downward. Note that this function
3027 * does not apply the change. Invoking ata_set_mode() afterwards
3028 * will apply the limit.
3031 * Inherited from caller.
3034 * 0 on success, negative errno on failure
3036 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3039 unsigned long orig_mask, xfer_mask;
3040 unsigned long pio_mask, mwdma_mask, udma_mask;
3043 quiet = !!(sel & ATA_DNXFER_QUIET);
3044 sel &= ~ATA_DNXFER_QUIET;
3046 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3049 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3052 case ATA_DNXFER_PIO:
3053 highbit = fls(pio_mask) - 1;
3054 pio_mask &= ~(1 << highbit);
3057 case ATA_DNXFER_DMA:
3059 highbit = fls(udma_mask) - 1;
3060 udma_mask &= ~(1 << highbit);
3063 } else if (mwdma_mask) {
3064 highbit = fls(mwdma_mask) - 1;
3065 mwdma_mask &= ~(1 << highbit);
3071 case ATA_DNXFER_40C:
3072 udma_mask &= ATA_UDMA_MASK_40C;
3075 case ATA_DNXFER_FORCE_PIO0:
3077 case ATA_DNXFER_FORCE_PIO:
3086 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3088 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3092 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3093 snprintf(buf, sizeof(buf), "%s:%s",
3094 ata_mode_string(xfer_mask),
3095 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3097 snprintf(buf, sizeof(buf), "%s",
3098 ata_mode_string(xfer_mask));
3100 ata_dev_printk(dev, KERN_WARNING,
3101 "limiting speed to %s\n", buf);
3104 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3110 static int ata_dev_set_mode(struct ata_device *dev)
3112 struct ata_eh_context *ehc = &dev->link->eh_context;
3113 const char *dev_err_whine = "";
3114 int ign_dev_err = 0;
3115 unsigned int err_mask;
3118 dev->flags &= ~ATA_DFLAG_PIO;
3119 if (dev->xfer_shift == ATA_SHIFT_PIO)
3120 dev->flags |= ATA_DFLAG_PIO;
3122 err_mask = ata_dev_set_xfermode(dev);
3124 if (err_mask & ~AC_ERR_DEV)
3128 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3129 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3130 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3134 if (dev->xfer_shift == ATA_SHIFT_PIO) {
3135 /* Old CFA may refuse this command, which is just fine */
3136 if (ata_id_is_cfa(dev->id))
3138 /* Catch several broken garbage emulations plus some pre
3140 if (ata_id_major_version(dev->id) == 0 &&
3141 dev->pio_mode <= XFER_PIO_2)
3143 /* Some very old devices and some bad newer ones fail
3144 any kind of SET_XFERMODE request but support PIO0-2
3145 timings and no IORDY */
3146 if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3149 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3150 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3151 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3152 dev->dma_mode == XFER_MW_DMA_0 &&
3153 (dev->id[63] >> 8) & 1)
3156 /* if the device is actually configured correctly, ignore dev err */
3157 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3160 if (err_mask & AC_ERR_DEV) {
3164 dev_err_whine = " (device error ignored)";
3167 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3168 dev->xfer_shift, (int)dev->xfer_mode);
3170 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
3171 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3177 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3178 "(err_mask=0x%x)\n", err_mask);
3183 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3184 * @link: link on which timings will be programmed
3185 * @r_failed_dev: out parameter for failed device
3187 * Standard implementation of the function used to tune and set
3188 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3189 * ata_dev_set_mode() fails, pointer to the failing device is
3190 * returned in @r_failed_dev.
3193 * PCI/etc. bus probe sem.
3196 * 0 on success, negative errno otherwise
3199 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3201 struct ata_port *ap = link->ap;
3202 struct ata_device *dev;
3203 int rc = 0, used_dma = 0, found = 0;
3205 /* step 1: calculate xfer_mask */
3206 ata_link_for_each_dev(dev, link) {
3207 unsigned long pio_mask, dma_mask;
3208 unsigned int mode_mask;
3210 if (!ata_dev_enabled(dev))
3213 mode_mask = ATA_DMA_MASK_ATA;
3214 if (dev->class == ATA_DEV_ATAPI)
3215 mode_mask = ATA_DMA_MASK_ATAPI;
3216 else if (ata_id_is_cfa(dev->id))
3217 mode_mask = ATA_DMA_MASK_CFA;
3219 ata_dev_xfermask(dev);
3220 ata_force_xfermask(dev);
3222 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3223 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3225 if (libata_dma_mask & mode_mask)
3226 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3230 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3231 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3234 if (dev->dma_mode != 0xff)
3240 /* step 2: always set host PIO timings */
3241 ata_link_for_each_dev(dev, link) {
3242 if (!ata_dev_enabled(dev))
3245 if (dev->pio_mode == 0xff) {
3246 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3251 dev->xfer_mode = dev->pio_mode;
3252 dev->xfer_shift = ATA_SHIFT_PIO;
3253 if (ap->ops->set_piomode)
3254 ap->ops->set_piomode(ap, dev);
3257 /* step 3: set host DMA timings */
3258 ata_link_for_each_dev(dev, link) {
3259 if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3262 dev->xfer_mode = dev->dma_mode;
3263 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3264 if (ap->ops->set_dmamode)
3265 ap->ops->set_dmamode(ap, dev);
3268 /* step 4: update devices' xfer mode */
3269 ata_link_for_each_dev(dev, link) {
3270 /* don't update suspended devices' xfer mode */
3271 if (!ata_dev_enabled(dev))
3274 rc = ata_dev_set_mode(dev);
3279 /* Record simplex status. If we selected DMA then the other
3280 * host channels are not permitted to do so.
3282 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3283 ap->host->simplex_claimed = ap;
3287 *r_failed_dev = dev;
3292 * ata_wait_ready - wait for link to become ready
3293 * @link: link to be waited on
3294 * @deadline: deadline jiffies for the operation
3295 * @check_ready: callback to check link readiness
3297 * Wait for @link to become ready. @check_ready should return
3298 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3299 * link doesn't seem to be occupied, other errno for other error
3302 * Transient -ENODEV conditions are allowed for
3303 * ATA_TMOUT_FF_WAIT.
3309 * 0 if @linke is ready before @deadline; otherwise, -errno.
3311 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3312 int (*check_ready)(struct ata_link *link))
3314 unsigned long start = jiffies;
3315 unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
3318 if (time_after(nodev_deadline, deadline))
3319 nodev_deadline = deadline;
3322 unsigned long now = jiffies;
3325 ready = tmp = check_ready(link);
3329 /* -ENODEV could be transient. Ignore -ENODEV if link
3330 * is online. Also, some SATA devices take a long
3331 * time to clear 0xff after reset. For example,
3332 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
3333 * GoVault needs even more than that. Wait for
3334 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
3336 * Note that some PATA controllers (pata_ali) explode
3337 * if status register is read more than once when
3338 * there's no device attached.
3340 if (ready == -ENODEV) {
3341 if (ata_link_online(link))
3343 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3344 !ata_link_offline(link) &&
3345 time_before(now, nodev_deadline))
3351 if (time_after(now, deadline))
3354 if (!warned && time_after(now, start + 5 * HZ) &&
3355 (deadline - now > 3 * HZ)) {
3356 ata_link_printk(link, KERN_WARNING,
3357 "link is slow to respond, please be patient "
3358 "(ready=%d)\n", tmp);
3367 * ata_wait_after_reset - wait for link to become ready after reset
3368 * @link: link to be waited on
3369 * @deadline: deadline jiffies for the operation
3370 * @check_ready: callback to check link readiness
3372 * Wait for @link to become ready after reset.
3378 * 0 if @linke is ready before @deadline; otherwise, -errno.
3380 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3381 int (*check_ready)(struct ata_link *link))
3383 msleep(ATA_WAIT_AFTER_RESET_MSECS);
3385 return ata_wait_ready(link, deadline, check_ready);
3389 * sata_link_debounce - debounce SATA phy status
3390 * @link: ATA link to debounce SATA phy status for
3391 * @params: timing parameters { interval, duratinon, timeout } in msec
3392 * @deadline: deadline jiffies for the operation
3394 * Make sure SStatus of @link reaches stable state, determined by
3395 * holding the same value where DET is not 1 for @duration polled
3396 * every @interval, before @timeout. Timeout constraints the
3397 * beginning of the stable state. Because DET gets stuck at 1 on
3398 * some controllers after hot unplugging, this functions waits
3399 * until timeout then returns 0 if DET is stable at 1.
3401 * @timeout is further limited by @deadline. The sooner of the
3405 * Kernel thread context (may sleep)
3408 * 0 on success, -errno on failure.
3410 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3411 unsigned long deadline)
3413 unsigned long interval_msec = params[0];
3414 unsigned long duration = msecs_to_jiffies(params[1]);
3415 unsigned long last_jiffies, t;
3419 t = jiffies + msecs_to_jiffies(params[2]);
3420 if (time_before(t, deadline))
3423 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3428 last_jiffies = jiffies;
3431 msleep(interval_msec);
3432 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3438 if (cur == 1 && time_before(jiffies, deadline))
3440 if (time_after(jiffies, last_jiffies + duration))
3445 /* unstable, start over */
3447 last_jiffies = jiffies;
3449 /* Check deadline. If debouncing failed, return
3450 * -EPIPE to tell upper layer to lower link speed.
3452 if (time_after(jiffies, deadline))
3458 * sata_link_resume - resume SATA link
3459 * @link: ATA link to resume SATA
3460 * @params: timing parameters { interval, duratinon, timeout } in msec
3461 * @deadline: deadline jiffies for the operation
3463 * Resume SATA phy @link and debounce it.
3466 * Kernel thread context (may sleep)
3469 * 0 on success, -errno on failure.
3471 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3472 unsigned long deadline)
3474 u32 scontrol, serror;
3477 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3480 scontrol = (scontrol & 0x0f0) | 0x300;
3482 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3485 /* Some PHYs react badly if SStatus is pounded immediately
3486 * after resuming. Delay 200ms before debouncing.
3490 if ((rc = sata_link_debounce(link, params, deadline)))
3493 /* clear SError, some PHYs require this even for SRST to work */
3494 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3495 rc = sata_scr_write(link, SCR_ERROR, serror);
3497 return rc != -EINVAL ? rc : 0;
3501 * ata_std_prereset - prepare for reset
3502 * @link: ATA link to be reset
3503 * @deadline: deadline jiffies for the operation
3505 * @link is about to be reset. Initialize it. Failure from
3506 * prereset makes libata abort whole reset sequence and give up
3507 * that port, so prereset should be best-effort. It does its
3508 * best to prepare for reset sequence but if things go wrong, it
3509 * should just whine, not fail.
3512 * Kernel thread context (may sleep)
3515 * 0 on success, -errno otherwise.
3517 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3519 struct ata_port *ap = link->ap;
3520 struct ata_eh_context *ehc = &link->eh_context;
3521 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3524 /* if we're about to do hardreset, nothing more to do */
3525 if (ehc->i.action & ATA_EH_HARDRESET)
3528 /* if SATA, resume link */
3529 if (ap->flags & ATA_FLAG_SATA) {
3530 rc = sata_link_resume(link, timing, deadline);
3531 /* whine about phy resume failure but proceed */
3532 if (rc && rc != -EOPNOTSUPP)
3533 ata_link_printk(link, KERN_WARNING, "failed to resume "
3534 "link for reset (errno=%d)\n", rc);
3537 /* no point in trying softreset on offline link */
3538 if (ata_link_offline(link))
3539 ehc->i.action &= ~ATA_EH_SOFTRESET;
3545 * sata_link_hardreset - reset link via SATA phy reset
3546 * @link: link to reset
3547 * @timing: timing parameters { interval, duratinon, timeout } in msec
3548 * @deadline: deadline jiffies for the operation
3549 * @online: optional out parameter indicating link onlineness
3550 * @check_ready: optional callback to check link readiness
3552 * SATA phy-reset @link using DET bits of SControl register.
3553 * After hardreset, link readiness is waited upon using
3554 * ata_wait_ready() if @check_ready is specified. LLDs are
3555 * allowed to not specify @check_ready and wait itself after this
3556 * function returns. Device classification is LLD's
3559 * *@online is set to one iff reset succeeded and @link is online
3563 * Kernel thread context (may sleep)
3566 * 0 on success, -errno otherwise.
3568 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3569 unsigned long deadline,
3570 bool *online, int (*check_ready)(struct ata_link *))
3580 if (sata_set_spd_needed(link)) {
3581 /* SATA spec says nothing about how to reconfigure
3582 * spd. To be on the safe side, turn off phy during
3583 * reconfiguration. This works for at least ICH7 AHCI
3586 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3589 scontrol = (scontrol & 0x0f0) | 0x304;
3591 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3597 /* issue phy wake/reset */
3598 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3601 scontrol = (scontrol & 0x0f0) | 0x301;
3603 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3606 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3607 * 10.4.2 says at least 1 ms.
3611 /* bring link back */
3612 rc = sata_link_resume(link, timing, deadline);
3615 /* if link is offline nothing more to do */
3616 if (ata_link_offline(link))
3619 /* Link is online. From this point, -ENODEV too is an error. */
3623 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3624 /* If PMP is supported, we have to do follow-up SRST.
3625 * Some PMPs don't send D2H Reg FIS after hardreset if
3626 * the first port is empty. Wait only for
3627 * ATA_TMOUT_PMP_SRST_WAIT.
3630 unsigned long pmp_deadline;
3632 pmp_deadline = jiffies + ATA_TMOUT_PMP_SRST_WAIT;
3633 if (time_after(pmp_deadline, deadline))
3634 pmp_deadline = deadline;
3635 ata_wait_ready(link, pmp_deadline, check_ready);
3643 rc = ata_wait_ready(link, deadline, check_ready);
3645 if (rc && rc != -EAGAIN) {
3646 /* online is set iff link is online && reset succeeded */
3649 ata_link_printk(link, KERN_ERR,
3650 "COMRESET failed (errno=%d)\n", rc);
3652 DPRINTK("EXIT, rc=%d\n", rc);
3657 * sata_std_hardreset - COMRESET w/o waiting or classification
3658 * @link: link to reset
3659 * @class: resulting class of attached device
3660 * @deadline: deadline jiffies for the operation
3662 * Standard SATA COMRESET w/o waiting or classification.
3665 * Kernel thread context (may sleep)
3668 * 0 if link offline, -EAGAIN if link online, -errno on errors.
3670 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3671 unsigned long deadline)
3673 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3678 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
3679 return online ? -EAGAIN : rc;
3683 * ata_std_postreset - standard postreset callback
3684 * @link: the target ata_link
3685 * @classes: classes of attached devices
3687 * This function is invoked after a successful reset. Note that
3688 * the device might have been reset more than once using
3689 * different reset methods before postreset is invoked.
3692 * Kernel thread context (may sleep)
3694 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3700 /* reset complete, clear SError */
3701 if (!sata_scr_read(link, SCR_ERROR, &serror))
3702 sata_scr_write(link, SCR_ERROR, serror);
3704 /* print link status */
3705 sata_print_link_status(link);
3711 * ata_dev_same_device - Determine whether new ID matches configured device
3712 * @dev: device to compare against
3713 * @new_class: class of the new device
3714 * @new_id: IDENTIFY page of the new device
3716 * Compare @new_class and @new_id against @dev and determine
3717 * whether @dev is the device indicated by @new_class and
3724 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3726 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3729 const u16 *old_id = dev->id;
3730 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3731 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3733 if (dev->class != new_class) {
3734 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3735 dev->class, new_class);
3739 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3740 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3741 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3742 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3744 if (strcmp(model[0], model[1])) {
3745 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3746 "'%s' != '%s'\n", model[0], model[1]);
3750 if (strcmp(serial[0], serial[1])) {
3751 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3752 "'%s' != '%s'\n", serial[0], serial[1]);
3760 * ata_dev_reread_id - Re-read IDENTIFY data
3761 * @dev: target ATA device
3762 * @readid_flags: read ID flags
3764 * Re-read IDENTIFY page and make sure @dev is still attached to
3768 * Kernel thread context (may sleep)
3771 * 0 on success, negative errno otherwise
3773 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3775 unsigned int class = dev->class;
3776 u16 *id = (void *)dev->link->ap->sector_buf;
3780 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3784 /* is the device still there? */
3785 if (!ata_dev_same_device(dev, class, id))
3788 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3793 * ata_dev_revalidate - Revalidate ATA device
3794 * @dev: device to revalidate
3795 * @new_class: new class code
3796 * @readid_flags: read ID flags
3798 * Re-read IDENTIFY page, make sure @dev is still attached to the
3799 * port and reconfigure it according to the new IDENTIFY page.
3802 * Kernel thread context (may sleep)
3805 * 0 on success, negative errno otherwise
3807 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
3808 unsigned int readid_flags)
3810 u64 n_sectors = dev->n_sectors;
3813 if (!ata_dev_enabled(dev))
3816 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
3817 if (ata_class_enabled(new_class) &&
3818 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
3819 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
3820 dev->class, new_class);
3826 rc = ata_dev_reread_id(dev, readid_flags);
3830 /* configure device according to the new ID */
3831 rc = ata_dev_configure(dev);
3835 /* verify n_sectors hasn't changed */
3836 if (dev->class == ATA_DEV_ATA && n_sectors &&
3837 dev->n_sectors != n_sectors) {
3838 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3840 (unsigned long long)n_sectors,
3841 (unsigned long long)dev->n_sectors);
3843 /* restore original n_sectors */
3844 dev->n_sectors = n_sectors;
3853 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3857 struct ata_blacklist_entry {
3858 const char *model_num;
3859 const char *model_rev;
3860 unsigned long horkage;
3863 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3864 /* Devices with DMA related problems under Linux */
3865 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3866 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3867 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3868 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3869 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3870 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3871 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3872 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3873 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3874 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3875 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3876 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3877 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3878 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3879 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3880 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3881 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3882 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3883 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3884 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3885 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3886 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3887 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3888 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3889 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3890 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3891 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3892 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3893 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
3894 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3895 /* Odd clown on sil3726/4726 PMPs */
3896 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
3897 ATA_HORKAGE_SKIP_PM },
3899 /* Weird ATAPI devices */
3900 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3902 /* Devices we expect to fail diagnostics */
3904 /* Devices where NCQ should be avoided */
3906 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3907 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3908 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3909 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3911 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
3912 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
3913 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
3914 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
3916 /* Blacklist entries taken from Silicon Image 3124/3132
3917 Windows driver .inf file - also several Linux problem reports */
3918 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3919 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3920 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3922 /* devices which puke on READ_NATIVE_MAX */
3923 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
3924 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3925 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3926 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
3928 /* Devices which report 1 sector over size HPA */
3929 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
3930 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
3931 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
3933 /* Devices which get the IVB wrong */
3934 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
3935 /* Maybe we should just blacklist TSSTcorp... */
3936 { "TSSTcorp CDDVDW SH-S202H", "SB00", ATA_HORKAGE_IVB, },
3937 { "TSSTcorp CDDVDW SH-S202H", "SB01", ATA_HORKAGE_IVB, },
3938 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
3939 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
3940 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
3941 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
3947 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
3953 * check for trailing wildcard: *\0
3955 p = strchr(patt, wildchar);
3956 if (p && ((*(p + 1)) == 0))
3967 return strncmp(patt, name, len);
3970 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3972 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3973 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3974 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3976 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3977 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3979 while (ad->model_num) {
3980 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3981 if (ad->model_rev == NULL)
3983 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3991 static int ata_dma_blacklisted(const struct ata_device *dev)
3993 /* We don't support polling DMA.
3994 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3995 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3997 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3998 (dev->flags & ATA_DFLAG_CDB_INTR))
4000 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4004 * ata_is_40wire - check drive side detection
4007 * Perform drive side detection decoding, allowing for device vendors
4008 * who can't follow the documentation.
4011 static int ata_is_40wire(struct ata_device *dev)
4013 if (dev->horkage & ATA_HORKAGE_IVB)
4014 return ata_drive_40wire_relaxed(dev->id);
4015 return ata_drive_40wire(dev->id);
4019 * cable_is_40wire - 40/80/SATA decider
4020 * @ap: port to consider
4022 * This function encapsulates the policy for speed management
4023 * in one place. At the moment we don't cache the result but
4024 * there is a good case for setting ap->cbl to the result when
4025 * we are called with unknown cables (and figuring out if it
4026 * impacts hotplug at all).
4028 * Return 1 if the cable appears to be 40 wire.
4031 static int cable_is_40wire(struct ata_port *ap)
4033 struct ata_link *link;
4034 struct ata_device *dev;
4036 /* If the controller thinks we are 40 wire, we are */
4037 if (ap->cbl == ATA_CBL_PATA40)
4039 /* If the controller thinks we are 80 wire, we are */
4040 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4042 /* If the system is known to be 40 wire short cable (eg laptop),
4043 then we allow 80 wire modes even if the drive isn't sure */
4044 if (ap->cbl == ATA_CBL_PATA40_SHORT)
4046 /* If the controller doesn't know we scan
4048 - Note: We look for all 40 wire detects at this point.
4049 Any 80 wire detect is taken to be 80 wire cable
4051 - In many setups only the one drive (slave if present)
4052 will give a valid detect
4053 - If you have a non detect capable drive you don't
4054 want it to colour the choice
4056 ata_port_for_each_link(link, ap) {
4057 ata_link_for_each_dev(dev, link) {
4058 if (!ata_is_40wire(dev))
4066 * ata_dev_xfermask - Compute supported xfermask of the given device
4067 * @dev: Device to compute xfermask for
4069 * Compute supported xfermask of @dev and store it in
4070 * dev->*_mask. This function is responsible for applying all
4071 * known limits including host controller limits, device
4077 static void ata_dev_xfermask(struct ata_device *dev)
4079 struct ata_link *link = dev->link;
4080 struct ata_port *ap = link->ap;
4081 struct ata_host *host = ap->host;
4082 unsigned long xfer_mask;
4084 /* controller modes available */
4085 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4086 ap->mwdma_mask, ap->udma_mask);
4088 /* drive modes available */
4089 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4090 dev->mwdma_mask, dev->udma_mask);
4091 xfer_mask &= ata_id_xfermask(dev->id);
4094 * CFA Advanced TrueIDE timings are not allowed on a shared
4097 if (ata_dev_pair(dev)) {
4098 /* No PIO5 or PIO6 */
4099 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4100 /* No MWDMA3 or MWDMA 4 */
4101 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4104 if (ata_dma_blacklisted(dev)) {
4105 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4106 ata_dev_printk(dev, KERN_WARNING,
4107 "device is on DMA blacklist, disabling DMA\n");
4110 if ((host->flags & ATA_HOST_SIMPLEX) &&
4111 host->simplex_claimed && host->simplex_claimed != ap) {
4112 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4113 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4114 "other device, disabling DMA\n");
4117 if (ap->flags & ATA_FLAG_NO_IORDY)
4118 xfer_mask &= ata_pio_mask_no_iordy(dev);
4120 if (ap->ops->mode_filter)
4121 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4123 /* Apply cable rule here. Don't apply it early because when
4124 * we handle hot plug the cable type can itself change.
4125 * Check this last so that we know if the transfer rate was
4126 * solely limited by the cable.
4127 * Unknown or 80 wire cables reported host side are checked
4128 * drive side as well. Cases where we know a 40wire cable
4129 * is used safely for 80 are not checked here.
4131 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4132 /* UDMA/44 or higher would be available */
4133 if (cable_is_40wire(ap)) {
4134 ata_dev_printk(dev, KERN_WARNING,
4135 "limited to UDMA/33 due to 40-wire cable\n");
4136 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4139 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4140 &dev->mwdma_mask, &dev->udma_mask);
4144 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4145 * @dev: Device to which command will be sent
4147 * Issue SET FEATURES - XFER MODE command to device @dev
4151 * PCI/etc. bus probe sem.
4154 * 0 on success, AC_ERR_* mask otherwise.
4157 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4159 struct ata_taskfile tf;
4160 unsigned int err_mask;
4162 /* set up set-features taskfile */
4163 DPRINTK("set features - xfer mode\n");
4165 /* Some controllers and ATAPI devices show flaky interrupt
4166 * behavior after setting xfer mode. Use polling instead.
4168 ata_tf_init(dev, &tf);
4169 tf.command = ATA_CMD_SET_FEATURES;
4170 tf.feature = SETFEATURES_XFER;
4171 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4172 tf.protocol = ATA_PROT_NODATA;
4173 /* If we are using IORDY we must send the mode setting command */
4174 if (ata_pio_need_iordy(dev))
4175 tf.nsect = dev->xfer_mode;
4176 /* If the device has IORDY and the controller does not - turn it off */
4177 else if (ata_id_has_iordy(dev->id))
4179 else /* In the ancient relic department - skip all of this */
4182 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4184 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4188 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4189 * @dev: Device to which command will be sent
4190 * @enable: Whether to enable or disable the feature
4191 * @feature: The sector count represents the feature to set
4193 * Issue SET FEATURES - SATA FEATURES command to device @dev
4194 * on port @ap with sector count
4197 * PCI/etc. bus probe sem.
4200 * 0 on success, AC_ERR_* mask otherwise.
4202 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4205 struct ata_taskfile tf;
4206 unsigned int err_mask;
4208 /* set up set-features taskfile */
4209 DPRINTK("set features - SATA features\n");
4211 ata_tf_init(dev, &tf);
4212 tf.command = ATA_CMD_SET_FEATURES;
4213 tf.feature = enable;
4214 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4215 tf.protocol = ATA_PROT_NODATA;
4218 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4220 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4225 * ata_dev_init_params - Issue INIT DEV PARAMS command
4226 * @dev: Device to which command will be sent
4227 * @heads: Number of heads (taskfile parameter)
4228 * @sectors: Number of sectors (taskfile parameter)
4231 * Kernel thread context (may sleep)
4234 * 0 on success, AC_ERR_* mask otherwise.
4236 static unsigned int ata_dev_init_params(struct ata_device *dev,
4237 u16 heads, u16 sectors)
4239 struct ata_taskfile tf;
4240 unsigned int err_mask;
4242 /* Number of sectors per track 1-255. Number of heads 1-16 */
4243 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4244 return AC_ERR_INVALID;
4246 /* set up init dev params taskfile */
4247 DPRINTK("init dev params \n");
4249 ata_tf_init(dev, &tf);
4250 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4251 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4252 tf.protocol = ATA_PROT_NODATA;
4254 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4256 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4257 /* A clean abort indicates an original or just out of spec drive
4258 and we should continue as we issue the setup based on the
4259 drive reported working geometry */
4260 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4263 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4268 * ata_sg_clean - Unmap DMA memory associated with command
4269 * @qc: Command containing DMA memory to be released
4271 * Unmap all mapped DMA memory associated with this command.
4274 * spin_lock_irqsave(host lock)
4276 void ata_sg_clean(struct ata_queued_cmd *qc)
4278 struct ata_port *ap = qc->ap;
4279 struct scatterlist *sg = qc->sg;
4280 int dir = qc->dma_dir;
4282 WARN_ON(sg == NULL);
4284 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4287 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4289 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4294 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4295 * @qc: Metadata associated with taskfile to check
4297 * Allow low-level driver to filter ATA PACKET commands, returning
4298 * a status indicating whether or not it is OK to use DMA for the
4299 * supplied PACKET command.
4302 * spin_lock_irqsave(host lock)
4304 * RETURNS: 0 when ATAPI DMA can be used
4307 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4309 struct ata_port *ap = qc->ap;
4311 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4312 * few ATAPI devices choke on such DMA requests.
4314 if (unlikely(qc->nbytes & 15))
4317 if (ap->ops->check_atapi_dma)
4318 return ap->ops->check_atapi_dma(qc);
4324 * ata_std_qc_defer - Check whether a qc needs to be deferred
4325 * @qc: ATA command in question
4327 * Non-NCQ commands cannot run with any other command, NCQ or
4328 * not. As upper layer only knows the queue depth, we are
4329 * responsible for maintaining exclusion. This function checks
4330 * whether a new command @qc can be issued.
4333 * spin_lock_irqsave(host lock)
4336 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4338 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4340 struct ata_link *link = qc->dev->link;
4342 if (qc->tf.protocol == ATA_PROT_NCQ) {
4343 if (!ata_tag_valid(link->active_tag))
4346 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4350 return ATA_DEFER_LINK;
4353 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4356 * ata_sg_init - Associate command with scatter-gather table.
4357 * @qc: Command to be associated
4358 * @sg: Scatter-gather table.
4359 * @n_elem: Number of elements in s/g table.
4361 * Initialize the data-related elements of queued_cmd @qc
4362 * to point to a scatter-gather table @sg, containing @n_elem
4366 * spin_lock_irqsave(host lock)
4368 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4369 unsigned int n_elem)
4372 qc->n_elem = n_elem;
4377 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4378 * @qc: Command with scatter-gather table to be mapped.
4380 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4383 * spin_lock_irqsave(host lock)
4386 * Zero on success, negative on error.
4389 static int ata_sg_setup(struct ata_queued_cmd *qc)
4391 struct ata_port *ap = qc->ap;
4392 unsigned int n_elem;
4394 VPRINTK("ENTER, ata%u\n", ap->print_id);
4396 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4400 DPRINTK("%d sg elements mapped\n", n_elem);
4402 qc->n_elem = n_elem;
4403 qc->flags |= ATA_QCFLAG_DMAMAP;
4409 * swap_buf_le16 - swap halves of 16-bit words in place
4410 * @buf: Buffer to swap
4411 * @buf_words: Number of 16-bit words in buffer.
4413 * Swap halves of 16-bit words if needed to convert from
4414 * little-endian byte order to native cpu byte order, or
4418 * Inherited from caller.
4420 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4425 for (i = 0; i < buf_words; i++)
4426 buf[i] = le16_to_cpu(buf[i]);
4427 #endif /* __BIG_ENDIAN */
4431 * ata_qc_new - Request an available ATA command, for queueing
4432 * @ap: Port associated with device @dev
4433 * @dev: Device from whom we request an available command structure
4439 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4441 struct ata_queued_cmd *qc = NULL;
4444 /* no command while frozen */
4445 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4448 /* the last tag is reserved for internal command. */
4449 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4450 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4451 qc = __ata_qc_from_tag(ap, i);
4462 * ata_qc_new_init - Request an available ATA command, and initialize it
4463 * @dev: Device from whom we request an available command structure
4469 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4471 struct ata_port *ap = dev->link->ap;
4472 struct ata_queued_cmd *qc;
4474 qc = ata_qc_new(ap);
4487 * ata_qc_free - free unused ata_queued_cmd
4488 * @qc: Command to complete
4490 * Designed to free unused ata_queued_cmd object
4491 * in case something prevents using it.
4494 * spin_lock_irqsave(host lock)
4496 void ata_qc_free(struct ata_queued_cmd *qc)
4498 struct ata_port *ap = qc->ap;
4501 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4505 if (likely(ata_tag_valid(tag))) {
4506 qc->tag = ATA_TAG_POISON;
4507 clear_bit(tag, &ap->qc_allocated);
4511 void __ata_qc_complete(struct ata_queued_cmd *qc)
4513 struct ata_port *ap = qc->ap;
4514 struct ata_link *link = qc->dev->link;
4516 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4517 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4519 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4522 /* command should be marked inactive atomically with qc completion */
4523 if (qc->tf.protocol == ATA_PROT_NCQ) {
4524 link->sactive &= ~(1 << qc->tag);
4526 ap->nr_active_links--;
4528 link->active_tag = ATA_TAG_POISON;
4529 ap->nr_active_links--;
4532 /* clear exclusive status */
4533 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4534 ap->excl_link == link))
4535 ap->excl_link = NULL;
4537 /* atapi: mark qc as inactive to prevent the interrupt handler
4538 * from completing the command twice later, before the error handler
4539 * is called. (when rc != 0 and atapi request sense is needed)
4541 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4542 ap->qc_active &= ~(1 << qc->tag);
4544 /* call completion callback */
4545 qc->complete_fn(qc);
4548 static void fill_result_tf(struct ata_queued_cmd *qc)
4550 struct ata_port *ap = qc->ap;
4552 qc->result_tf.flags = qc->tf.flags;
4553 ap->ops->qc_fill_rtf(qc);
4556 static void ata_verify_xfer(struct ata_queued_cmd *qc)
4558 struct ata_device *dev = qc->dev;
4560 if (ata_tag_internal(qc->tag))
4563 if (ata_is_nodata(qc->tf.protocol))
4566 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
4569 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
4573 * ata_qc_complete - Complete an active ATA command
4574 * @qc: Command to complete
4575 * @err_mask: ATA Status register contents
4577 * Indicate to the mid and upper layers that an ATA
4578 * command has completed, with either an ok or not-ok status.
4581 * spin_lock_irqsave(host lock)
4583 void ata_qc_complete(struct ata_queued_cmd *qc)
4585 struct ata_port *ap = qc->ap;
4587 /* XXX: New EH and old EH use different mechanisms to
4588 * synchronize EH with regular execution path.
4590 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4591 * Normal execution path is responsible for not accessing a
4592 * failed qc. libata core enforces the rule by returning NULL
4593 * from ata_qc_from_tag() for failed qcs.
4595 * Old EH depends on ata_qc_complete() nullifying completion
4596 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4597 * not synchronize with interrupt handler. Only PIO task is
4600 if (ap->ops->error_handler) {
4601 struct ata_device *dev = qc->dev;
4602 struct ata_eh_info *ehi = &dev->link->eh_info;
4604 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4606 if (unlikely(qc->err_mask))
4607 qc->flags |= ATA_QCFLAG_FAILED;
4609 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4610 if (!ata_tag_internal(qc->tag)) {
4611 /* always fill result TF for failed qc */
4613 ata_qc_schedule_eh(qc);
4618 /* read result TF if requested */
4619 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4622 /* Some commands need post-processing after successful
4625 switch (qc->tf.command) {
4626 case ATA_CMD_SET_FEATURES:
4627 if (qc->tf.feature != SETFEATURES_WC_ON &&
4628 qc->tf.feature != SETFEATURES_WC_OFF)
4631 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
4632 case ATA_CMD_SET_MULTI: /* multi_count changed */
4633 /* revalidate device */
4634 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
4635 ata_port_schedule_eh(ap);
4639 dev->flags |= ATA_DFLAG_SLEEPING;
4643 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
4644 ata_verify_xfer(qc);
4646 __ata_qc_complete(qc);
4648 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4651 /* read result TF if failed or requested */
4652 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4655 __ata_qc_complete(qc);
4660 * ata_qc_complete_multiple - Complete multiple qcs successfully
4661 * @ap: port in question
4662 * @qc_active: new qc_active mask
4664 * Complete in-flight commands. This functions is meant to be
4665 * called from low-level driver's interrupt routine to complete
4666 * requests normally. ap->qc_active and @qc_active is compared
4667 * and commands are completed accordingly.
4670 * spin_lock_irqsave(host lock)
4673 * Number of completed commands on success, -errno otherwise.
4675 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4681 done_mask = ap->qc_active ^ qc_active;
4683 if (unlikely(done_mask & qc_active)) {
4684 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4685 "(%08x->%08x)\n", ap->qc_active, qc_active);
4689 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4690 struct ata_queued_cmd *qc;
4692 if (!(done_mask & (1 << i)))
4695 if ((qc = ata_qc_from_tag(ap, i))) {
4696 ata_qc_complete(qc);
4705 * ata_qc_issue - issue taskfile to device
4706 * @qc: command to issue to device
4708 * Prepare an ATA command to submission to device.
4709 * This includes mapping the data into a DMA-able
4710 * area, filling in the S/G table, and finally
4711 * writing the taskfile to hardware, starting the command.
4714 * spin_lock_irqsave(host lock)
4716 void ata_qc_issue(struct ata_queued_cmd *qc)
4718 struct ata_port *ap = qc->ap;
4719 struct ata_link *link = qc->dev->link;
4720 u8 prot = qc->tf.protocol;
4722 /* Make sure only one non-NCQ command is outstanding. The
4723 * check is skipped for old EH because it reuses active qc to
4724 * request ATAPI sense.
4726 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4728 if (ata_is_ncq(prot)) {
4729 WARN_ON(link->sactive & (1 << qc->tag));
4732 ap->nr_active_links++;
4733 link->sactive |= 1 << qc->tag;
4735 WARN_ON(link->sactive);
4737 ap->nr_active_links++;
4738 link->active_tag = qc->tag;
4741 qc->flags |= ATA_QCFLAG_ACTIVE;
4742 ap->qc_active |= 1 << qc->tag;
4744 /* We guarantee to LLDs that they will have at least one
4745 * non-zero sg if the command is a data command.
4747 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
4749 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4750 (ap->flags & ATA_FLAG_PIO_DMA)))
4751 if (ata_sg_setup(qc))
4754 /* if device is sleeping, schedule reset and abort the link */
4755 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
4756 link->eh_info.action |= ATA_EH_RESET;
4757 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
4758 ata_link_abort(link);
4762 ap->ops->qc_prep(qc);
4764 qc->err_mask |= ap->ops->qc_issue(qc);
4765 if (unlikely(qc->err_mask))
4770 qc->err_mask |= AC_ERR_SYSTEM;
4772 ata_qc_complete(qc);
4776 * sata_scr_valid - test whether SCRs are accessible
4777 * @link: ATA link to test SCR accessibility for
4779 * Test whether SCRs are accessible for @link.
4785 * 1 if SCRs are accessible, 0 otherwise.
4787 int sata_scr_valid(struct ata_link *link)
4789 struct ata_port *ap = link->ap;
4791 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
4795 * sata_scr_read - read SCR register of the specified port
4796 * @link: ATA link to read SCR for
4798 * @val: Place to store read value
4800 * Read SCR register @reg of @link into *@val. This function is
4801 * guaranteed to succeed if @link is ap->link, the cable type of
4802 * the port is SATA and the port implements ->scr_read.
4805 * None if @link is ap->link. Kernel thread context otherwise.
4808 * 0 on success, negative errno on failure.
4810 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
4812 if (ata_is_host_link(link)) {
4813 struct ata_port *ap = link->ap;
4815 if (sata_scr_valid(link))
4816 return ap->ops->scr_read(ap, reg, val);
4820 return sata_pmp_scr_read(link, reg, val);
4824 * sata_scr_write - write SCR register of the specified port
4825 * @link: ATA link to write SCR for
4826 * @reg: SCR to write
4827 * @val: value to write
4829 * Write @val to SCR register @reg of @link. This function is
4830 * guaranteed to succeed if @link is ap->link, the cable type of
4831 * the port is SATA and the port implements ->scr_read.
4834 * None if @link is ap->link. Kernel thread context otherwise.
4837 * 0 on success, negative errno on failure.
4839 int sata_scr_write(struct ata_link *link, int reg, u32 val)
4841 if (ata_is_host_link(link)) {
4842 struct ata_port *ap = link->ap;
4844 if (sata_scr_valid(link))
4845 return ap->ops->scr_write(ap, reg, val);
4849 return sata_pmp_scr_write(link, reg, val);
4853 * sata_scr_write_flush - write SCR register of the specified port and flush
4854 * @link: ATA link to write SCR for
4855 * @reg: SCR to write
4856 * @val: value to write
4858 * This function is identical to sata_scr_write() except that this
4859 * function performs flush after writing to the register.
4862 * None if @link is ap->link. Kernel thread context otherwise.
4865 * 0 on success, negative errno on failure.
4867 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
4869 if (ata_is_host_link(link)) {
4870 struct ata_port *ap = link->ap;
4873 if (sata_scr_valid(link)) {
4874 rc = ap->ops->scr_write(ap, reg, val);
4876 rc = ap->ops->scr_read(ap, reg, &val);
4882 return sata_pmp_scr_write(link, reg, val);
4886 * ata_link_online - test whether the given link is online
4887 * @link: ATA link to test
4889 * Test whether @link is online. Note that this function returns
4890 * 0 if online status of @link cannot be obtained, so
4891 * ata_link_online(link) != !ata_link_offline(link).
4897 * 1 if the port online status is available and online.
4899 int ata_link_online(struct ata_link *link)
4903 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4904 (sstatus & 0xf) == 0x3)
4910 * ata_link_offline - test whether the given link is offline
4911 * @link: ATA link to test
4913 * Test whether @link is offline. Note that this function
4914 * returns 0 if offline status of @link cannot be obtained, so
4915 * ata_link_online(link) != !ata_link_offline(link).
4921 * 1 if the port offline status is available and offline.
4923 int ata_link_offline(struct ata_link *link)
4927 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4928 (sstatus & 0xf) != 0x3)
4934 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
4935 unsigned int action, unsigned int ehi_flags,
4938 unsigned long flags;
4941 for (i = 0; i < host->n_ports; i++) {
4942 struct ata_port *ap = host->ports[i];
4943 struct ata_link *link;
4945 /* Previous resume operation might still be in
4946 * progress. Wait for PM_PENDING to clear.
4948 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
4949 ata_port_wait_eh(ap);
4950 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4953 /* request PM ops to EH */
4954 spin_lock_irqsave(ap->lock, flags);
4959 ap->pm_result = &rc;
4962 ap->pflags |= ATA_PFLAG_PM_PENDING;
4963 __ata_port_for_each_link(link, ap) {
4964 link->eh_info.action |= action;
4965 link->eh_info.flags |= ehi_flags;
4968 ata_port_schedule_eh(ap);
4970 spin_unlock_irqrestore(ap->lock, flags);
4972 /* wait and check result */
4974 ata_port_wait_eh(ap);
4975 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4985 * ata_host_suspend - suspend host
4986 * @host: host to suspend
4989 * Suspend @host. Actual operation is performed by EH. This
4990 * function requests EH to perform PM operations and waits for EH
4994 * Kernel thread context (may sleep).
4997 * 0 on success, -errno on failure.
4999 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5004 * disable link pm on all ports before requesting
5007 ata_lpm_enable(host);
5009 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5011 host->dev->power.power_state = mesg;
5016 * ata_host_resume - resume host
5017 * @host: host to resume
5019 * Resume @host. Actual operation is performed by EH. This
5020 * function requests EH to perform PM operations and returns.
5021 * Note that all resume operations are performed parallely.
5024 * Kernel thread context (may sleep).
5026 void ata_host_resume(struct ata_host *host)
5028 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
5029 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5030 host->dev->power.power_state = PMSG_ON;
5032 /* reenable link pm */
5033 ata_lpm_disable(host);
5038 * ata_port_start - Set port up for dma.
5039 * @ap: Port to initialize
5041 * Called just after data structures for each port are
5042 * initialized. Allocates space for PRD table.
5044 * May be used as the port_start() entry in ata_port_operations.
5047 * Inherited from caller.
5049 int ata_port_start(struct ata_port *ap)
5051 struct device *dev = ap->dev;
5053 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5062 * ata_dev_init - Initialize an ata_device structure
5063 * @dev: Device structure to initialize
5065 * Initialize @dev in preparation for probing.
5068 * Inherited from caller.
5070 void ata_dev_init(struct ata_device *dev)
5072 struct ata_link *link = dev->link;
5073 struct ata_port *ap = link->ap;
5074 unsigned long flags;
5076 /* SATA spd limit is bound to the first device */
5077 link->sata_spd_limit = link->hw_sata_spd_limit;
5080 /* High bits of dev->flags are used to record warm plug
5081 * requests which occur asynchronously. Synchronize using
5084 spin_lock_irqsave(ap->lock, flags);
5085 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5087 spin_unlock_irqrestore(ap->lock, flags);
5089 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
5090 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5091 dev->pio_mask = UINT_MAX;
5092 dev->mwdma_mask = UINT_MAX;
5093 dev->udma_mask = UINT_MAX;
5097 * ata_link_init - Initialize an ata_link structure
5098 * @ap: ATA port link is attached to
5099 * @link: Link structure to initialize
5100 * @pmp: Port multiplier port number
5105 * Kernel thread context (may sleep)
5107 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5111 /* clear everything except for devices */
5112 memset(link, 0, offsetof(struct ata_link, device[0]));
5116 link->active_tag = ATA_TAG_POISON;
5117 link->hw_sata_spd_limit = UINT_MAX;
5119 /* can't use iterator, ap isn't initialized yet */
5120 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5121 struct ata_device *dev = &link->device[i];
5124 dev->devno = dev - link->device;
5130 * sata_link_init_spd - Initialize link->sata_spd_limit
5131 * @link: Link to configure sata_spd_limit for
5133 * Initialize @link->[hw_]sata_spd_limit to the currently
5137 * Kernel thread context (may sleep).
5140 * 0 on success, -errno on failure.
5142 int sata_link_init_spd(struct ata_link *link)
5148 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
5152 spd = (scontrol >> 4) & 0xf;
5154 link->hw_sata_spd_limit &= (1 << spd) - 1;
5156 ata_force_spd_limit(link);
5158 link->sata_spd_limit = link->hw_sata_spd_limit;
5164 * ata_port_alloc - allocate and initialize basic ATA port resources
5165 * @host: ATA host this allocated port belongs to
5167 * Allocate and initialize basic ATA port resources.
5170 * Allocate ATA port on success, NULL on failure.
5173 * Inherited from calling layer (may sleep).
5175 struct ata_port *ata_port_alloc(struct ata_host *host)
5177 struct ata_port *ap;
5181 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5185 ap->pflags |= ATA_PFLAG_INITIALIZING;
5186 ap->lock = &host->lock;
5187 ap->flags = ATA_FLAG_DISABLED;
5189 ap->ctl = ATA_DEVCTL_OBS;
5191 ap->dev = host->dev;
5192 ap->last_ctl = 0xFF;
5194 #if defined(ATA_VERBOSE_DEBUG)
5195 /* turn on all debugging levels */
5196 ap->msg_enable = 0x00FF;
5197 #elif defined(ATA_DEBUG)
5198 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
5200 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5203 #ifdef CONFIG_ATA_SFF
5204 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5206 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5207 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5208 INIT_LIST_HEAD(&ap->eh_done_q);
5209 init_waitqueue_head(&ap->eh_wait_q);
5210 init_timer_deferrable(&ap->fastdrain_timer);
5211 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
5212 ap->fastdrain_timer.data = (unsigned long)ap;
5214 ap->cbl = ATA_CBL_NONE;
5216 ata_link_init(ap, &ap->link, 0);
5219 ap->stats.unhandled_irq = 1;
5220 ap->stats.idle_irq = 1;
5225 static void ata_host_release(struct device *gendev, void *res)
5227 struct ata_host *host = dev_get_drvdata(gendev);
5230 for (i = 0; i < host->n_ports; i++) {
5231 struct ata_port *ap = host->ports[i];
5237 scsi_host_put(ap->scsi_host);
5239 kfree(ap->pmp_link);
5241 host->ports[i] = NULL;
5244 dev_set_drvdata(gendev, NULL);
5248 * ata_host_alloc - allocate and init basic ATA host resources
5249 * @dev: generic device this host is associated with
5250 * @max_ports: maximum number of ATA ports associated with this host
5252 * Allocate and initialize basic ATA host resources. LLD calls
5253 * this function to allocate a host, initializes it fully and
5254 * attaches it using ata_host_register().
5256 * @max_ports ports are allocated and host->n_ports is
5257 * initialized to @max_ports. The caller is allowed to decrease
5258 * host->n_ports before calling ata_host_register(). The unused
5259 * ports will be automatically freed on registration.
5262 * Allocate ATA host on success, NULL on failure.
5265 * Inherited from calling layer (may sleep).
5267 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5269 struct ata_host *host;
5275 if (!devres_open_group(dev, NULL, GFP_KERNEL))
5278 /* alloc a container for our list of ATA ports (buses) */
5279 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5280 /* alloc a container for our list of ATA ports (buses) */
5281 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
5285 devres_add(dev, host);
5286 dev_set_drvdata(dev, host);
5288 spin_lock_init(&host->lock);
5290 host->n_ports = max_ports;
5292 /* allocate ports bound to this host */
5293 for (i = 0; i < max_ports; i++) {
5294 struct ata_port *ap;
5296 ap = ata_port_alloc(host);
5301 host->ports[i] = ap;
5304 devres_remove_group(dev, NULL);
5308 devres_release_group(dev, NULL);
5313 * ata_host_alloc_pinfo - alloc host and init with port_info array
5314 * @dev: generic device this host is associated with
5315 * @ppi: array of ATA port_info to initialize host with
5316 * @n_ports: number of ATA ports attached to this host
5318 * Allocate ATA host and initialize with info from @ppi. If NULL
5319 * terminated, @ppi may contain fewer entries than @n_ports. The
5320 * last entry will be used for the remaining ports.
5323 * Allocate ATA host on success, NULL on failure.
5326 * Inherited from calling layer (may sleep).
5328 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5329 const struct ata_port_info * const * ppi,
5332 const struct ata_port_info *pi;
5333 struct ata_host *host;
5336 host = ata_host_alloc(dev, n_ports);
5340 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
5341 struct ata_port *ap = host->ports[i];
5346 ap->pio_mask = pi->pio_mask;
5347 ap->mwdma_mask = pi->mwdma_mask;
5348 ap->udma_mask = pi->udma_mask;
5349 ap->flags |= pi->flags;
5350 ap->link.flags |= pi->link_flags;
5351 ap->ops = pi->port_ops;
5353 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5354 host->ops = pi->port_ops;
5360 static void ata_host_stop(struct device *gendev, void *res)
5362 struct ata_host *host = dev_get_drvdata(gendev);
5365 WARN_ON(!(host->flags & ATA_HOST_STARTED));
5367 for (i = 0; i < host->n_ports; i++) {
5368 struct ata_port *ap = host->ports[i];
5370 if (ap->ops->port_stop)
5371 ap->ops->port_stop(ap);
5374 if (host->ops->host_stop)
5375 host->ops->host_stop(host);
5379 * ata_finalize_port_ops - finalize ata_port_operations
5380 * @ops: ata_port_operations to finalize
5382 * An ata_port_operations can inherit from another ops and that
5383 * ops can again inherit from another. This can go on as many
5384 * times as necessary as long as there is no loop in the
5385 * inheritance chain.
5387 * Ops tables are finalized when the host is started. NULL or
5388 * unspecified entries are inherited from the closet ancestor
5389 * which has the method and the entry is populated with it.
5390 * After finalization, the ops table directly points to all the
5391 * methods and ->inherits is no longer necessary and cleared.
5393 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5398 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5400 static spinlock_t lock = SPIN_LOCK_UNLOCKED;
5401 const struct ata_port_operations *cur;
5402 void **begin = (void **)ops;
5403 void **end = (void **)&ops->inherits;
5406 if (!ops || !ops->inherits)
5411 for (cur = ops->inherits; cur; cur = cur->inherits) {
5412 void **inherit = (void **)cur;
5414 for (pp = begin; pp < end; pp++, inherit++)
5419 for (pp = begin; pp < end; pp++)
5423 ops->inherits = NULL;
5429 * ata_host_start - start and freeze ports of an ATA host
5430 * @host: ATA host to start ports for
5432 * Start and then freeze ports of @host. Started status is
5433 * recorded in host->flags, so this function can be called
5434 * multiple times. Ports are guaranteed to get started only
5435 * once. If host->ops isn't initialized yet, its set to the
5436 * first non-dummy port ops.
5439 * Inherited from calling layer (may sleep).
5442 * 0 if all ports are started successfully, -errno otherwise.
5444 int ata_host_start(struct ata_host *host)
5447 void *start_dr = NULL;
5450 if (host->flags & ATA_HOST_STARTED)
5453 ata_finalize_port_ops(host->ops);
5455 for (i = 0; i < host->n_ports; i++) {
5456 struct ata_port *ap = host->ports[i];
5458 ata_finalize_port_ops(ap->ops);
5460 if (!host->ops && !ata_port_is_dummy(ap))
5461 host->ops = ap->ops;
5463 if (ap->ops->port_stop)
5467 if (host->ops->host_stop)
5471 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
5476 for (i = 0; i < host->n_ports; i++) {
5477 struct ata_port *ap = host->ports[i];
5479 if (ap->ops->port_start) {
5480 rc = ap->ops->port_start(ap);
5483 dev_printk(KERN_ERR, host->dev,
5484 "failed to start port %d "
5485 "(errno=%d)\n", i, rc);
5489 ata_eh_freeze_port(ap);
5493 devres_add(host->dev, start_dr);
5494 host->flags |= ATA_HOST_STARTED;
5499 struct ata_port *ap = host->ports[i];
5501 if (ap->ops->port_stop)
5502 ap->ops->port_stop(ap);
5504 devres_free(start_dr);
5509 * ata_sas_host_init - Initialize a host struct
5510 * @host: host to initialize
5511 * @dev: device host is attached to
5512 * @flags: host flags
5516 * PCI/etc. bus probe sem.
5519 /* KILLME - the only user left is ipr */
5520 void ata_host_init(struct ata_host *host, struct device *dev,
5521 unsigned long flags, struct ata_port_operations *ops)
5523 spin_lock_init(&host->lock);
5525 host->flags = flags;
5530 * ata_host_register - register initialized ATA host
5531 * @host: ATA host to register
5532 * @sht: template for SCSI host
5534 * Register initialized ATA host. @host is allocated using
5535 * ata_host_alloc() and fully initialized by LLD. This function
5536 * starts ports, registers @host with ATA and SCSI layers and
5537 * probe registered devices.
5540 * Inherited from calling layer (may sleep).
5543 * 0 on success, -errno otherwise.
5545 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
5549 /* host must have been started */
5550 if (!(host->flags & ATA_HOST_STARTED)) {
5551 dev_printk(KERN_ERR, host->dev,
5552 "BUG: trying to register unstarted host\n");
5557 /* Blow away unused ports. This happens when LLD can't
5558 * determine the exact number of ports to allocate at
5561 for (i = host->n_ports; host->ports[i]; i++)
5562 kfree(host->ports[i]);
5564 /* give ports names and add SCSI hosts */
5565 for (i = 0; i < host->n_ports; i++)
5566 host->ports[i]->print_id = ata_print_id++;
5568 rc = ata_scsi_add_hosts(host, sht);
5572 /* associate with ACPI nodes */
5573 ata_acpi_associate(host);
5575 /* set cable, sata_spd_limit and report */
5576 for (i = 0; i < host->n_ports; i++) {
5577 struct ata_port *ap = host->ports[i];
5578 unsigned long xfer_mask;
5580 /* set SATA cable type if still unset */
5581 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
5582 ap->cbl = ATA_CBL_SATA;
5584 /* init sata_spd_limit to the current value */
5585 sata_link_init_spd(&ap->link);
5587 /* print per-port info to dmesg */
5588 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
5591 if (!ata_port_is_dummy(ap)) {
5592 ata_port_printk(ap, KERN_INFO,
5593 "%cATA max %s %s\n",
5594 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5595 ata_mode_string(xfer_mask),
5596 ap->link.eh_info.desc);
5597 ata_ehi_clear_desc(&ap->link.eh_info);
5599 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
5602 /* perform each probe synchronously */
5603 DPRINTK("probe begin\n");
5604 for (i = 0; i < host->n_ports; i++) {
5605 struct ata_port *ap = host->ports[i];
5608 if (ap->ops->error_handler) {
5609 struct ata_eh_info *ehi = &ap->link.eh_info;
5610 unsigned long flags;
5614 /* kick EH for boot probing */
5615 spin_lock_irqsave(ap->lock, flags);
5617 ehi->probe_mask |= ATA_ALL_DEVICES;
5618 ehi->action |= ATA_EH_RESET;
5619 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5621 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
5622 ap->pflags |= ATA_PFLAG_LOADING;
5623 ata_port_schedule_eh(ap);
5625 spin_unlock_irqrestore(ap->lock, flags);
5627 /* wait for EH to finish */
5628 ata_port_wait_eh(ap);
5630 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5631 rc = ata_bus_probe(ap);
5632 DPRINTK("ata%u: bus probe end\n", ap->print_id);
5635 /* FIXME: do something useful here?
5636 * Current libata behavior will
5637 * tear down everything when
5638 * the module is removed
5639 * or the h/w is unplugged.
5645 /* probes are done, now scan each port's disk(s) */
5646 DPRINTK("host probe begin\n");
5647 for (i = 0; i < host->n_ports; i++) {
5648 struct ata_port *ap = host->ports[i];
5650 ata_scsi_scan_host(ap, 1);
5651 ata_lpm_schedule(ap, ap->pm_policy);
5658 * ata_host_activate - start host, request IRQ and register it
5659 * @host: target ATA host
5660 * @irq: IRQ to request
5661 * @irq_handler: irq_handler used when requesting IRQ
5662 * @irq_flags: irq_flags used when requesting IRQ
5663 * @sht: scsi_host_template to use when registering the host
5665 * After allocating an ATA host and initializing it, most libata
5666 * LLDs perform three steps to activate the host - start host,
5667 * request IRQ and register it. This helper takes necessasry
5668 * arguments and performs the three steps in one go.
5670 * An invalid IRQ skips the IRQ registration and expects the host to
5671 * have set polling mode on the port. In this case, @irq_handler
5675 * Inherited from calling layer (may sleep).
5678 * 0 on success, -errno otherwise.
5680 int ata_host_activate(struct ata_host *host, int irq,
5681 irq_handler_t irq_handler, unsigned long irq_flags,
5682 struct scsi_host_template *sht)
5686 rc = ata_host_start(host);
5690 /* Special case for polling mode */
5692 WARN_ON(irq_handler);
5693 return ata_host_register(host, sht);
5696 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
5697 dev_driver_string(host->dev), host);
5701 for (i = 0; i < host->n_ports; i++)
5702 ata_port_desc(host->ports[i], "irq %d", irq);
5704 rc = ata_host_register(host, sht);
5705 /* if failed, just free the IRQ and leave ports alone */
5707 devm_free_irq(host->dev, irq, host);
5713 * ata_port_detach - Detach ATA port in prepration of device removal
5714 * @ap: ATA port to be detached
5716 * Detach all ATA devices and the associated SCSI devices of @ap;
5717 * then, remove the associated SCSI host. @ap is guaranteed to
5718 * be quiescent on return from this function.
5721 * Kernel thread context (may sleep).
5723 static void ata_port_detach(struct ata_port *ap)
5725 unsigned long flags;
5726 struct ata_link *link;
5727 struct ata_device *dev;
5729 if (!ap->ops->error_handler)
5732 /* tell EH we're leaving & flush EH */
5733 spin_lock_irqsave(ap->lock, flags);
5734 ap->pflags |= ATA_PFLAG_UNLOADING;
5735 spin_unlock_irqrestore(ap->lock, flags);
5737 ata_port_wait_eh(ap);
5739 /* EH is now guaranteed to see UNLOADING - EH context belongs
5740 * to us. Disable all existing devices.
5742 ata_port_for_each_link(link, ap) {
5743 ata_link_for_each_dev(dev, link)
5744 ata_dev_disable(dev);
5747 /* Final freeze & EH. All in-flight commands are aborted. EH
5748 * will be skipped and retrials will be terminated with bad
5751 spin_lock_irqsave(ap->lock, flags);
5752 ata_port_freeze(ap); /* won't be thawed */
5753 spin_unlock_irqrestore(ap->lock, flags);
5755 ata_port_wait_eh(ap);
5756 cancel_rearming_delayed_work(&ap->hotplug_task);
5759 /* remove the associated SCSI host */
5760 scsi_remove_host(ap->scsi_host);
5764 * ata_host_detach - Detach all ports of an ATA host
5765 * @host: Host to detach
5767 * Detach all ports of @host.
5770 * Kernel thread context (may sleep).
5772 void ata_host_detach(struct ata_host *host)
5776 for (i = 0; i < host->n_ports; i++)
5777 ata_port_detach(host->ports[i]);
5779 /* the host is dead now, dissociate ACPI */
5780 ata_acpi_dissociate(host);
5786 * ata_pci_remove_one - PCI layer callback for device removal
5787 * @pdev: PCI device that was removed
5789 * PCI layer indicates to libata via this hook that hot-unplug or
5790 * module unload event has occurred. Detach all ports. Resource
5791 * release is handled via devres.
5794 * Inherited from PCI layer (may sleep).
5796 void ata_pci_remove_one(struct pci_dev *pdev)
5798 struct device *dev = &pdev->dev;
5799 struct ata_host *host = dev_get_drvdata(dev);
5801 ata_host_detach(host);
5804 /* move to PCI subsystem */
5805 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5807 unsigned long tmp = 0;
5809 switch (bits->width) {
5812 pci_read_config_byte(pdev, bits->reg, &tmp8);
5818 pci_read_config_word(pdev, bits->reg, &tmp16);
5824 pci_read_config_dword(pdev, bits->reg, &tmp32);
5835 return (tmp == bits->val) ? 1 : 0;
5839 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
5841 pci_save_state(pdev);
5842 pci_disable_device(pdev);
5844 if (mesg.event & PM_EVENT_SLEEP)
5845 pci_set_power_state(pdev, PCI_D3hot);
5848 int ata_pci_device_do_resume(struct pci_dev *pdev)
5852 pci_set_power_state(pdev, PCI_D0);
5853 pci_restore_state(pdev);
5855 rc = pcim_enable_device(pdev);
5857 dev_printk(KERN_ERR, &pdev->dev,
5858 "failed to enable device after resume (%d)\n", rc);
5862 pci_set_master(pdev);
5866 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
5868 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5871 rc = ata_host_suspend(host, mesg);
5875 ata_pci_device_do_suspend(pdev, mesg);
5880 int ata_pci_device_resume(struct pci_dev *pdev)
5882 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5885 rc = ata_pci_device_do_resume(pdev);
5887 ata_host_resume(host);
5890 #endif /* CONFIG_PM */
5892 #endif /* CONFIG_PCI */
5894 static int __init ata_parse_force_one(char **cur,
5895 struct ata_force_ent *force_ent,
5896 const char **reason)
5898 /* FIXME: Currently, there's no way to tag init const data and
5899 * using __initdata causes build failure on some versions of
5900 * gcc. Once __initdataconst is implemented, add const to the
5901 * following structure.
5903 static struct ata_force_param force_tbl[] __initdata = {
5904 { "40c", .cbl = ATA_CBL_PATA40 },
5905 { "80c", .cbl = ATA_CBL_PATA80 },
5906 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
5907 { "unk", .cbl = ATA_CBL_PATA_UNK },
5908 { "ign", .cbl = ATA_CBL_PATA_IGN },
5909 { "sata", .cbl = ATA_CBL_SATA },
5910 { "1.5Gbps", .spd_limit = 1 },
5911 { "3.0Gbps", .spd_limit = 2 },
5912 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
5913 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
5914 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
5915 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
5916 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
5917 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
5918 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
5919 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
5920 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
5921 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
5922 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
5923 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
5924 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
5925 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
5926 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5927 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5928 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5929 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5930 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5931 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5932 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5933 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5934 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5935 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5936 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5937 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5938 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5939 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5940 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5941 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5942 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5943 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5944 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5945 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5946 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5947 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
5949 char *start = *cur, *p = *cur;
5950 char *id, *val, *endp;
5951 const struct ata_force_param *match_fp = NULL;
5952 int nr_matches = 0, i;
5954 /* find where this param ends and update *cur */
5955 while (*p != '\0' && *p != ',')
5966 p = strchr(start, ':');
5968 val = strstrip(start);
5973 id = strstrip(start);
5974 val = strstrip(p + 1);
5977 p = strchr(id, '.');
5980 force_ent->device = simple_strtoul(p, &endp, 10);
5981 if (p == endp || *endp != '\0') {
5982 *reason = "invalid device";
5987 force_ent->port = simple_strtoul(id, &endp, 10);
5988 if (p == endp || *endp != '\0') {
5989 *reason = "invalid port/link";
5994 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
5995 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
5996 const struct ata_force_param *fp = &force_tbl[i];
5998 if (strncasecmp(val, fp->name, strlen(val)))
6004 if (strcasecmp(val, fp->name) == 0) {
6011 *reason = "unknown value";
6014 if (nr_matches > 1) {
6015 *reason = "ambigious value";
6019 force_ent->param = *match_fp;
6024 static void __init ata_parse_force_param(void)
6026 int idx = 0, size = 1;
6027 int last_port = -1, last_device = -1;
6028 char *p, *cur, *next;
6030 /* calculate maximum number of params and allocate force_tbl */
6031 for (p = ata_force_param_buf; *p; p++)
6035 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
6036 if (!ata_force_tbl) {
6037 printk(KERN_WARNING "ata: failed to extend force table, "
6038 "libata.force ignored\n");
6042 /* parse and populate the table */
6043 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
6044 const char *reason = "";
6045 struct ata_force_ent te = { .port = -1, .device = -1 };
6048 if (ata_parse_force_one(&next, &te, &reason)) {
6049 printk(KERN_WARNING "ata: failed to parse force "
6050 "parameter \"%s\" (%s)\n",
6055 if (te.port == -1) {
6056 te.port = last_port;
6057 te.device = last_device;
6060 ata_force_tbl[idx++] = te;
6062 last_port = te.port;
6063 last_device = te.device;
6066 ata_force_tbl_size = idx;
6069 static int __init ata_init(void)
6071 ata_probe_timeout *= HZ;
6073 ata_parse_force_param();
6075 ata_wq = create_workqueue("ata");
6079 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6081 destroy_workqueue(ata_wq);
6085 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6089 static void __exit ata_exit(void)
6091 kfree(ata_force_tbl);
6092 destroy_workqueue(ata_wq);
6093 destroy_workqueue(ata_aux_wq);
6096 subsys_initcall(ata_init);
6097 module_exit(ata_exit);
6099 static unsigned long ratelimit_time;
6100 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6102 int ata_ratelimit(void)
6105 unsigned long flags;
6107 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6109 if (time_after(jiffies, ratelimit_time)) {
6111 ratelimit_time = jiffies + (HZ/5);
6115 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6121 * ata_wait_register - wait until register value changes
6122 * @reg: IO-mapped register
6123 * @mask: Mask to apply to read register value
6124 * @val: Wait condition
6125 * @interval_msec: polling interval in milliseconds
6126 * @timeout_msec: timeout in milliseconds
6128 * Waiting for some bits of register to change is a common
6129 * operation for ATA controllers. This function reads 32bit LE
6130 * IO-mapped register @reg and tests for the following condition.
6132 * (*@reg & mask) != val
6134 * If the condition is met, it returns; otherwise, the process is
6135 * repeated after @interval_msec until timeout.
6138 * Kernel thread context (may sleep)
6141 * The final register value.
6143 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6144 unsigned long interval_msec,
6145 unsigned long timeout_msec)
6147 unsigned long timeout;
6150 tmp = ioread32(reg);
6152 /* Calculate timeout _after_ the first read to make sure
6153 * preceding writes reach the controller before starting to
6154 * eat away the timeout.
6156 timeout = jiffies + (timeout_msec * HZ) / 1000;
6158 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6159 msleep(interval_msec);
6160 tmp = ioread32(reg);
6169 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6171 return AC_ERR_SYSTEM;
6174 static void ata_dummy_error_handler(struct ata_port *ap)
6179 struct ata_port_operations ata_dummy_port_ops = {
6180 .qc_prep = ata_noop_qc_prep,
6181 .qc_issue = ata_dummy_qc_issue,
6182 .error_handler = ata_dummy_error_handler,
6185 const struct ata_port_info ata_dummy_port_info = {
6186 .port_ops = &ata_dummy_port_ops,
6190 * libata is essentially a library of internal helper functions for
6191 * low-level ATA host controller drivers. As such, the API/ABI is
6192 * likely to change as new drivers are added and updated.
6193 * Do not depend on ABI/API stability.
6195 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6196 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6197 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6198 EXPORT_SYMBOL_GPL(ata_base_port_ops);
6199 EXPORT_SYMBOL_GPL(sata_port_ops);
6200 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6201 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6202 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6203 EXPORT_SYMBOL_GPL(ata_host_init);
6204 EXPORT_SYMBOL_GPL(ata_host_alloc);
6205 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6206 EXPORT_SYMBOL_GPL(ata_host_start);
6207 EXPORT_SYMBOL_GPL(ata_host_register);
6208 EXPORT_SYMBOL_GPL(ata_host_activate);
6209 EXPORT_SYMBOL_GPL(ata_host_detach);
6210 EXPORT_SYMBOL_GPL(ata_sg_init);
6211 EXPORT_SYMBOL_GPL(ata_qc_complete);
6212 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6213 EXPORT_SYMBOL_GPL(atapi_cmd_type);
6214 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6215 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6216 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
6217 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
6218 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
6219 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
6220 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
6221 EXPORT_SYMBOL_GPL(ata_mode_string);
6222 EXPORT_SYMBOL_GPL(ata_id_xfermask);
6223 EXPORT_SYMBOL_GPL(ata_port_start);
6224 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6225 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6226 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6227 EXPORT_SYMBOL_GPL(ata_port_probe);
6228 EXPORT_SYMBOL_GPL(ata_dev_disable);
6229 EXPORT_SYMBOL_GPL(sata_set_spd);
6230 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6231 EXPORT_SYMBOL_GPL(sata_link_debounce);
6232 EXPORT_SYMBOL_GPL(sata_link_resume);
6233 EXPORT_SYMBOL_GPL(ata_std_prereset);
6234 EXPORT_SYMBOL_GPL(sata_link_hardreset);
6235 EXPORT_SYMBOL_GPL(sata_std_hardreset);
6236 EXPORT_SYMBOL_GPL(ata_std_postreset);
6237 EXPORT_SYMBOL_GPL(ata_dev_classify);
6238 EXPORT_SYMBOL_GPL(ata_dev_pair);
6239 EXPORT_SYMBOL_GPL(ata_port_disable);
6240 EXPORT_SYMBOL_GPL(ata_ratelimit);
6241 EXPORT_SYMBOL_GPL(ata_wait_register);
6242 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6243 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6244 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6245 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6246 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6247 EXPORT_SYMBOL_GPL(sata_scr_valid);
6248 EXPORT_SYMBOL_GPL(sata_scr_read);
6249 EXPORT_SYMBOL_GPL(sata_scr_write);
6250 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6251 EXPORT_SYMBOL_GPL(ata_link_online);
6252 EXPORT_SYMBOL_GPL(ata_link_offline);
6254 EXPORT_SYMBOL_GPL(ata_host_suspend);
6255 EXPORT_SYMBOL_GPL(ata_host_resume);
6256 #endif /* CONFIG_PM */
6257 EXPORT_SYMBOL_GPL(ata_id_string);
6258 EXPORT_SYMBOL_GPL(ata_id_c_string);
6259 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6261 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6262 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
6263 EXPORT_SYMBOL_GPL(ata_timing_compute);
6264 EXPORT_SYMBOL_GPL(ata_timing_merge);
6265 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
6268 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6269 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6271 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6272 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6273 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6274 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6275 #endif /* CONFIG_PM */
6276 #endif /* CONFIG_PCI */
6278 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
6279 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
6280 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6281 EXPORT_SYMBOL_GPL(ata_port_desc);
6283 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
6284 #endif /* CONFIG_PCI */
6285 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6286 EXPORT_SYMBOL_GPL(ata_link_abort);
6287 EXPORT_SYMBOL_GPL(ata_port_abort);
6288 EXPORT_SYMBOL_GPL(ata_port_freeze);
6289 EXPORT_SYMBOL_GPL(sata_async_notification);
6290 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6291 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6292 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6293 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6294 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
6295 EXPORT_SYMBOL_GPL(ata_do_eh);
6296 EXPORT_SYMBOL_GPL(ata_std_error_handler);
6298 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6299 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6300 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6301 EXPORT_SYMBOL_GPL(ata_cable_ignore);
6302 EXPORT_SYMBOL_GPL(ata_cable_sata);