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/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port *ap,
65 struct ata_device *dev,
68 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
69 struct ata_device *dev);
70 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
72 static unsigned int ata_unique_id = 1;
73 static struct workqueue_struct *ata_wq;
75 int atapi_enabled = 1;
76 module_param(atapi_enabled, int, 0444);
77 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
80 module_param(atapi_dmadir, int, 0444);
81 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
84 module_param_named(fua, libata_fua, int, 0444);
85 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
87 MODULE_AUTHOR("Jeff Garzik");
88 MODULE_DESCRIPTION("Library module for ATA devices");
89 MODULE_LICENSE("GPL");
90 MODULE_VERSION(DRV_VERSION);
94 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
95 * @tf: Taskfile to convert
96 * @fis: Buffer into which data will output
97 * @pmp: Port multiplier port
99 * Converts a standard ATA taskfile to a Serial ATA
100 * FIS structure (Register - Host to Device).
103 * Inherited from caller.
106 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
108 fis[0] = 0x27; /* Register - Host to Device FIS */
109 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
110 bit 7 indicates Command FIS */
111 fis[2] = tf->command;
112 fis[3] = tf->feature;
119 fis[8] = tf->hob_lbal;
120 fis[9] = tf->hob_lbam;
121 fis[10] = tf->hob_lbah;
122 fis[11] = tf->hob_feature;
125 fis[13] = tf->hob_nsect;
136 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
137 * @fis: Buffer from which data will be input
138 * @tf: Taskfile to output
140 * Converts a serial ATA FIS structure to a standard ATA taskfile.
143 * Inherited from caller.
146 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
148 tf->command = fis[2]; /* status */
149 tf->feature = fis[3]; /* error */
156 tf->hob_lbal = fis[8];
157 tf->hob_lbam = fis[9];
158 tf->hob_lbah = fis[10];
161 tf->hob_nsect = fis[13];
164 static const u8 ata_rw_cmds[] = {
168 ATA_CMD_READ_MULTI_EXT,
169 ATA_CMD_WRITE_MULTI_EXT,
173 ATA_CMD_WRITE_MULTI_FUA_EXT,
177 ATA_CMD_PIO_READ_EXT,
178 ATA_CMD_PIO_WRITE_EXT,
191 ATA_CMD_WRITE_FUA_EXT
195 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
196 * @qc: command to examine and configure
198 * Examine the device configuration and tf->flags to calculate
199 * the proper read/write commands and protocol to use.
204 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
206 struct ata_taskfile *tf = &qc->tf;
207 struct ata_device *dev = qc->dev;
210 int index, fua, lba48, write;
212 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
213 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
214 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
216 if (dev->flags & ATA_DFLAG_PIO) {
217 tf->protocol = ATA_PROT_PIO;
218 index = dev->multi_count ? 0 : 8;
219 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
220 /* Unable to use DMA due to host limitation */
221 tf->protocol = ATA_PROT_PIO;
222 index = dev->multi_count ? 0 : 8;
224 tf->protocol = ATA_PROT_DMA;
228 cmd = ata_rw_cmds[index + fua + lba48 + write];
237 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
238 * @pio_mask: pio_mask
239 * @mwdma_mask: mwdma_mask
240 * @udma_mask: udma_mask
242 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
243 * unsigned int xfer_mask.
251 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
252 unsigned int mwdma_mask,
253 unsigned int udma_mask)
255 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
256 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
257 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
261 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
262 * @xfer_mask: xfer_mask to unpack
263 * @pio_mask: resulting pio_mask
264 * @mwdma_mask: resulting mwdma_mask
265 * @udma_mask: resulting udma_mask
267 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
268 * Any NULL distination masks will be ignored.
270 static void ata_unpack_xfermask(unsigned int xfer_mask,
271 unsigned int *pio_mask,
272 unsigned int *mwdma_mask,
273 unsigned int *udma_mask)
276 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
278 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
280 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
283 static const struct ata_xfer_ent {
287 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
288 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
289 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
294 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
295 * @xfer_mask: xfer_mask of interest
297 * Return matching XFER_* value for @xfer_mask. Only the highest
298 * bit of @xfer_mask is considered.
304 * Matching XFER_* value, 0 if no match found.
306 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
308 int highbit = fls(xfer_mask) - 1;
309 const struct ata_xfer_ent *ent;
311 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
312 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
313 return ent->base + highbit - ent->shift;
318 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
319 * @xfer_mode: XFER_* of interest
321 * Return matching xfer_mask for @xfer_mode.
327 * Matching xfer_mask, 0 if no match found.
329 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
331 const struct ata_xfer_ent *ent;
333 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
334 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
335 return 1 << (ent->shift + xfer_mode - ent->base);
340 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
341 * @xfer_mode: XFER_* of interest
343 * Return matching xfer_shift for @xfer_mode.
349 * Matching xfer_shift, -1 if no match found.
351 static int ata_xfer_mode2shift(unsigned int xfer_mode)
353 const struct ata_xfer_ent *ent;
355 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
356 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
362 * ata_mode_string - convert xfer_mask to string
363 * @xfer_mask: mask of bits supported; only highest bit counts.
365 * Determine string which represents the highest speed
366 * (highest bit in @modemask).
372 * Constant C string representing highest speed listed in
373 * @mode_mask, or the constant C string "<n/a>".
375 static const char *ata_mode_string(unsigned int xfer_mask)
377 static const char * const xfer_mode_str[] = {
397 highbit = fls(xfer_mask) - 1;
398 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
399 return xfer_mode_str[highbit];
403 static const char *sata_spd_string(unsigned int spd)
405 static const char * const spd_str[] = {
410 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
412 return spd_str[spd - 1];
415 void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
417 if (ata_dev_enabled(dev)) {
418 printk(KERN_WARNING "ata%u: dev %u disabled\n",
425 * ata_pio_devchk - PATA device presence detection
426 * @ap: ATA channel to examine
427 * @device: Device to examine (starting at zero)
429 * This technique was originally described in
430 * Hale Landis's ATADRVR (www.ata-atapi.com), and
431 * later found its way into the ATA/ATAPI spec.
433 * Write a pattern to the ATA shadow registers,
434 * and if a device is present, it will respond by
435 * correctly storing and echoing back the
436 * ATA shadow register contents.
442 static unsigned int ata_pio_devchk(struct ata_port *ap,
445 struct ata_ioports *ioaddr = &ap->ioaddr;
448 ap->ops->dev_select(ap, device);
450 outb(0x55, ioaddr->nsect_addr);
451 outb(0xaa, ioaddr->lbal_addr);
453 outb(0xaa, ioaddr->nsect_addr);
454 outb(0x55, ioaddr->lbal_addr);
456 outb(0x55, ioaddr->nsect_addr);
457 outb(0xaa, ioaddr->lbal_addr);
459 nsect = inb(ioaddr->nsect_addr);
460 lbal = inb(ioaddr->lbal_addr);
462 if ((nsect == 0x55) && (lbal == 0xaa))
463 return 1; /* we found a device */
465 return 0; /* nothing found */
469 * ata_mmio_devchk - PATA device presence detection
470 * @ap: ATA channel to examine
471 * @device: Device to examine (starting at zero)
473 * This technique was originally described in
474 * Hale Landis's ATADRVR (www.ata-atapi.com), and
475 * later found its way into the ATA/ATAPI spec.
477 * Write a pattern to the ATA shadow registers,
478 * and if a device is present, it will respond by
479 * correctly storing and echoing back the
480 * ATA shadow register contents.
486 static unsigned int ata_mmio_devchk(struct ata_port *ap,
489 struct ata_ioports *ioaddr = &ap->ioaddr;
492 ap->ops->dev_select(ap, device);
494 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
495 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
497 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
498 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
500 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
501 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
503 nsect = readb((void __iomem *) ioaddr->nsect_addr);
504 lbal = readb((void __iomem *) ioaddr->lbal_addr);
506 if ((nsect == 0x55) && (lbal == 0xaa))
507 return 1; /* we found a device */
509 return 0; /* nothing found */
513 * ata_devchk - PATA device presence detection
514 * @ap: ATA channel to examine
515 * @device: Device to examine (starting at zero)
517 * Dispatch ATA device presence detection, depending
518 * on whether we are using PIO or MMIO to talk to the
519 * ATA shadow registers.
525 static unsigned int ata_devchk(struct ata_port *ap,
528 if (ap->flags & ATA_FLAG_MMIO)
529 return ata_mmio_devchk(ap, device);
530 return ata_pio_devchk(ap, device);
534 * ata_dev_classify - determine device type based on ATA-spec signature
535 * @tf: ATA taskfile register set for device to be identified
537 * Determine from taskfile register contents whether a device is
538 * ATA or ATAPI, as per "Signature and persistence" section
539 * of ATA/PI spec (volume 1, sect 5.14).
545 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
546 * the event of failure.
549 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
551 /* Apple's open source Darwin code hints that some devices only
552 * put a proper signature into the LBA mid/high registers,
553 * So, we only check those. It's sufficient for uniqueness.
556 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
557 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
558 DPRINTK("found ATA device by sig\n");
562 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
563 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
564 DPRINTK("found ATAPI device by sig\n");
565 return ATA_DEV_ATAPI;
568 DPRINTK("unknown device\n");
569 return ATA_DEV_UNKNOWN;
573 * ata_dev_try_classify - Parse returned ATA device signature
574 * @ap: ATA channel to examine
575 * @device: Device to examine (starting at zero)
576 * @r_err: Value of error register on completion
578 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
579 * an ATA/ATAPI-defined set of values is placed in the ATA
580 * shadow registers, indicating the results of device detection
583 * Select the ATA device, and read the values from the ATA shadow
584 * registers. Then parse according to the Error register value,
585 * and the spec-defined values examined by ata_dev_classify().
591 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
595 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
597 struct ata_taskfile tf;
601 ap->ops->dev_select(ap, device);
603 memset(&tf, 0, sizeof(tf));
605 ap->ops->tf_read(ap, &tf);
610 /* see if device passed diags */
613 else if ((device == 0) && (err == 0x81))
618 /* determine if device is ATA or ATAPI */
619 class = ata_dev_classify(&tf);
621 if (class == ATA_DEV_UNKNOWN)
623 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
629 * ata_id_string - Convert IDENTIFY DEVICE page into string
630 * @id: IDENTIFY DEVICE results we will examine
631 * @s: string into which data is output
632 * @ofs: offset into identify device page
633 * @len: length of string to return. must be an even number.
635 * The strings in the IDENTIFY DEVICE page are broken up into
636 * 16-bit chunks. Run through the string, and output each
637 * 8-bit chunk linearly, regardless of platform.
643 void ata_id_string(const u16 *id, unsigned char *s,
644 unsigned int ofs, unsigned int len)
663 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
664 * @id: IDENTIFY DEVICE results we will examine
665 * @s: string into which data is output
666 * @ofs: offset into identify device page
667 * @len: length of string to return. must be an odd number.
669 * This function is identical to ata_id_string except that it
670 * trims trailing spaces and terminates the resulting string with
671 * null. @len must be actual maximum length (even number) + 1.
676 void ata_id_c_string(const u16 *id, unsigned char *s,
677 unsigned int ofs, unsigned int len)
683 ata_id_string(id, s, ofs, len - 1);
685 p = s + strnlen(s, len - 1);
686 while (p > s && p[-1] == ' ')
691 static u64 ata_id_n_sectors(const u16 *id)
693 if (ata_id_has_lba(id)) {
694 if (ata_id_has_lba48(id))
695 return ata_id_u64(id, 100);
697 return ata_id_u32(id, 60);
699 if (ata_id_current_chs_valid(id))
700 return ata_id_u32(id, 57);
702 return id[1] * id[3] * id[6];
707 * ata_noop_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * This function performs no actual function.
713 * May be used as the dev_select() entry in ata_port_operations.
718 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
724 * ata_std_dev_select - Select device 0/1 on ATA bus
725 * @ap: ATA channel to manipulate
726 * @device: ATA device (numbered from zero) to select
728 * Use the method defined in the ATA specification to
729 * make either device 0, or device 1, active on the
730 * ATA channel. Works with both PIO and MMIO.
732 * May be used as the dev_select() entry in ata_port_operations.
738 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
743 tmp = ATA_DEVICE_OBS;
745 tmp = ATA_DEVICE_OBS | ATA_DEV1;
747 if (ap->flags & ATA_FLAG_MMIO) {
748 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
750 outb(tmp, ap->ioaddr.device_addr);
752 ata_pause(ap); /* needed; also flushes, for mmio */
756 * ata_dev_select - Select device 0/1 on ATA bus
757 * @ap: ATA channel to manipulate
758 * @device: ATA device (numbered from zero) to select
759 * @wait: non-zero to wait for Status register BSY bit to clear
760 * @can_sleep: non-zero if context allows sleeping
762 * Use the method defined in the ATA specification to
763 * make either device 0, or device 1, active on the
766 * This is a high-level version of ata_std_dev_select(),
767 * which additionally provides the services of inserting
768 * the proper pauses and status polling, where needed.
774 void ata_dev_select(struct ata_port *ap, unsigned int device,
775 unsigned int wait, unsigned int can_sleep)
777 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
778 ap->id, device, wait);
783 ap->ops->dev_select(ap, device);
786 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
793 * ata_dump_id - IDENTIFY DEVICE info debugging output
794 * @id: IDENTIFY DEVICE page to dump
796 * Dump selected 16-bit words from the given IDENTIFY DEVICE
803 static inline void ata_dump_id(const u16 *id)
805 DPRINTK("49==0x%04x "
815 DPRINTK("80==0x%04x "
825 DPRINTK("88==0x%04x "
832 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
833 * @id: IDENTIFY data to compute xfer mask from
835 * Compute the xfermask for this device. This is not as trivial
836 * as it seems if we must consider early devices correctly.
838 * FIXME: pre IDE drive timing (do we care ?).
846 static unsigned int ata_id_xfermask(const u16 *id)
848 unsigned int pio_mask, mwdma_mask, udma_mask;
850 /* Usual case. Word 53 indicates word 64 is valid */
851 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
852 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
856 /* If word 64 isn't valid then Word 51 high byte holds
857 * the PIO timing number for the maximum. Turn it into
860 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
862 /* But wait.. there's more. Design your standards by
863 * committee and you too can get a free iordy field to
864 * process. However its the speeds not the modes that
865 * are supported... Note drivers using the timing API
866 * will get this right anyway
870 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
873 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
874 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
876 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
880 * ata_port_queue_task - Queue port_task
881 * @ap: The ata_port to queue port_task for
883 * Schedule @fn(@data) for execution after @delay jiffies using
884 * port_task. There is one port_task per port and it's the
885 * user(low level driver)'s responsibility to make sure that only
886 * one task is active at any given time.
888 * libata core layer takes care of synchronization between
889 * port_task and EH. ata_port_queue_task() may be ignored for EH
893 * Inherited from caller.
895 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
900 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
903 PREPARE_WORK(&ap->port_task, fn, data);
906 rc = queue_work(ata_wq, &ap->port_task);
908 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
910 /* rc == 0 means that another user is using port task */
915 * ata_port_flush_task - Flush port_task
916 * @ap: The ata_port to flush port_task for
918 * After this function completes, port_task is guranteed not to
919 * be running or scheduled.
922 * Kernel thread context (may sleep)
924 void ata_port_flush_task(struct ata_port *ap)
930 spin_lock_irqsave(&ap->host_set->lock, flags);
931 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
932 spin_unlock_irqrestore(&ap->host_set->lock, flags);
934 DPRINTK("flush #1\n");
935 flush_workqueue(ata_wq);
938 * At this point, if a task is running, it's guaranteed to see
939 * the FLUSH flag; thus, it will never queue pio tasks again.
942 if (!cancel_delayed_work(&ap->port_task)) {
943 DPRINTK("flush #2\n");
944 flush_workqueue(ata_wq);
947 spin_lock_irqsave(&ap->host_set->lock, flags);
948 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
949 spin_unlock_irqrestore(&ap->host_set->lock, flags);
954 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
956 struct completion *waiting = qc->private_data;
958 qc->ap->ops->tf_read(qc->ap, &qc->tf);
963 * ata_exec_internal - execute libata internal command
964 * @ap: Port to which the command is sent
965 * @dev: Device to which the command is sent
966 * @tf: Taskfile registers for the command and the result
967 * @cdb: CDB for packet command
968 * @dma_dir: Data tranfer direction of the command
969 * @buf: Data buffer of the command
970 * @buflen: Length of data buffer
972 * Executes libata internal command with timeout. @tf contains
973 * command on entry and result on return. Timeout and error
974 * conditions are reported via return value. No recovery action
975 * is taken after a command times out. It's caller's duty to
976 * clean up after timeout.
979 * None. Should be called with kernel context, might sleep.
982 unsigned ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
983 struct ata_taskfile *tf, const u8 *cdb,
984 int dma_dir, void *buf, unsigned int buflen)
986 u8 command = tf->command;
987 struct ata_queued_cmd *qc;
988 DECLARE_COMPLETION(wait);
990 unsigned int err_mask;
992 spin_lock_irqsave(&ap->host_set->lock, flags);
994 qc = ata_qc_new_init(ap, dev);
999 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1000 qc->dma_dir = dma_dir;
1001 if (dma_dir != DMA_NONE) {
1002 ata_sg_init_one(qc, buf, buflen);
1003 qc->nsect = buflen / ATA_SECT_SIZE;
1006 qc->private_data = &wait;
1007 qc->complete_fn = ata_qc_complete_internal;
1011 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1013 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
1014 ata_port_flush_task(ap);
1016 spin_lock_irqsave(&ap->host_set->lock, flags);
1018 /* We're racing with irq here. If we lose, the
1019 * following test prevents us from completing the qc
1020 * again. If completion irq occurs after here but
1021 * before the caller cleans up, it will result in a
1022 * spurious interrupt. We can live with that.
1024 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1025 qc->err_mask = AC_ERR_TIMEOUT;
1026 ata_qc_complete(qc);
1027 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1031 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1035 err_mask = qc->err_mask;
1039 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1040 * Until those drivers are fixed, we detect the condition
1041 * here, fail the command with AC_ERR_SYSTEM and reenable the
1044 * Note that this doesn't change any behavior as internal
1045 * command failure results in disabling the device in the
1046 * higher layer for LLDDs without new reset/EH callbacks.
1048 * Kill the following code as soon as those drivers are fixed.
1050 if (ap->flags & ATA_FLAG_DISABLED) {
1051 err_mask |= AC_ERR_SYSTEM;
1059 * ata_pio_need_iordy - check if iordy needed
1062 * Check if the current speed of the device requires IORDY. Used
1063 * by various controllers for chip configuration.
1066 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1069 int speed = adev->pio_mode - XFER_PIO_0;
1076 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1078 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1079 pio = adev->id[ATA_ID_EIDE_PIO];
1080 /* Is the speed faster than the drive allows non IORDY ? */
1082 /* This is cycle times not frequency - watch the logic! */
1083 if (pio > 240) /* PIO2 is 240nS per cycle */
1092 * ata_dev_read_id - Read ID data from the specified device
1093 * @ap: port on which target device resides
1094 * @dev: target device
1095 * @p_class: pointer to class of the target device (may be changed)
1096 * @post_reset: is this read ID post-reset?
1097 * @p_id: read IDENTIFY page (newly allocated)
1099 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1100 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1101 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1102 * for pre-ATA4 drives.
1105 * Kernel thread context (may sleep)
1108 * 0 on success, -errno otherwise.
1110 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1111 unsigned int *p_class, int post_reset, u16 **p_id)
1113 unsigned int class = *p_class;
1114 struct ata_taskfile tf;
1115 unsigned int err_mask = 0;
1120 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1122 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1124 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1127 reason = "out of memory";
1132 ata_tf_init(ap, &tf, dev->devno);
1136 tf.command = ATA_CMD_ID_ATA;
1139 tf.command = ATA_CMD_ID_ATAPI;
1143 reason = "unsupported class";
1147 tf.protocol = ATA_PROT_PIO;
1149 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_FROM_DEVICE,
1150 id, sizeof(id[0]) * ATA_ID_WORDS);
1153 reason = "I/O error";
1157 swap_buf_le16(id, ATA_ID_WORDS);
1160 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1162 reason = "device reports illegal type";
1166 if (post_reset && class == ATA_DEV_ATA) {
1168 * The exact sequence expected by certain pre-ATA4 drives is:
1171 * INITIALIZE DEVICE PARAMETERS
1173 * Some drives were very specific about that exact sequence.
1175 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1176 err_mask = ata_dev_init_params(ap, dev, id[3], id[6]);
1179 reason = "INIT_DEV_PARAMS failed";
1183 /* current CHS translation info (id[53-58]) might be
1184 * changed. reread the identify device info.
1196 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1197 ap->id, dev->devno, reason);
1202 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1203 struct ata_device *dev)
1205 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1209 * ata_dev_configure - Configure the specified ATA/ATAPI device
1210 * @ap: Port on which target device resides
1211 * @dev: Target device to configure
1212 * @print_info: Enable device info printout
1214 * Configure @dev according to @dev->id. Generic and low-level
1215 * driver specific fixups are also applied.
1218 * Kernel thread context (may sleep)
1221 * 0 on success, -errno otherwise
1223 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1226 const u16 *id = dev->id;
1227 unsigned int xfer_mask;
1230 if (!ata_dev_enabled(dev)) {
1231 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1232 ap->id, dev->devno);
1236 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1238 /* print device capabilities */
1240 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1241 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1242 ap->id, dev->devno, id[49], id[82], id[83],
1243 id[84], id[85], id[86], id[87], id[88]);
1245 /* initialize to-be-configured parameters */
1246 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1247 dev->max_sectors = 0;
1255 * common ATA, ATAPI feature tests
1258 /* find max transfer mode; for printk only */
1259 xfer_mask = ata_id_xfermask(id);
1263 /* ATA-specific feature tests */
1264 if (dev->class == ATA_DEV_ATA) {
1265 dev->n_sectors = ata_id_n_sectors(id);
1267 if (ata_id_has_lba(id)) {
1268 const char *lba_desc;
1271 dev->flags |= ATA_DFLAG_LBA;
1272 if (ata_id_has_lba48(id)) {
1273 dev->flags |= ATA_DFLAG_LBA48;
1277 /* print device info to dmesg */
1279 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1280 "max %s, %Lu sectors: %s\n",
1282 ata_id_major_version(id),
1283 ata_mode_string(xfer_mask),
1284 (unsigned long long)dev->n_sectors,
1289 /* Default translation */
1290 dev->cylinders = id[1];
1292 dev->sectors = id[6];
1294 if (ata_id_current_chs_valid(id)) {
1295 /* Current CHS translation is valid. */
1296 dev->cylinders = id[54];
1297 dev->heads = id[55];
1298 dev->sectors = id[56];
1301 /* print device info to dmesg */
1303 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1304 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1306 ata_id_major_version(id),
1307 ata_mode_string(xfer_mask),
1308 (unsigned long long)dev->n_sectors,
1309 dev->cylinders, dev->heads, dev->sectors);
1315 /* ATAPI-specific feature tests */
1316 else if (dev->class == ATA_DEV_ATAPI) {
1317 rc = atapi_cdb_len(id);
1318 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1319 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1323 dev->cdb_len = (unsigned int) rc;
1325 /* print device info to dmesg */
1327 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1328 ap->id, dev->devno, ata_mode_string(xfer_mask));
1331 ap->host->max_cmd_len = 0;
1332 for (i = 0; i < ATA_MAX_DEVICES; i++)
1333 ap->host->max_cmd_len = max_t(unsigned int,
1334 ap->host->max_cmd_len,
1335 ap->device[i].cdb_len);
1337 /* limit bridge transfers to udma5, 200 sectors */
1338 if (ata_dev_knobble(ap, dev)) {
1340 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1341 ap->id, dev->devno);
1342 dev->udma_mask &= ATA_UDMA5;
1343 dev->max_sectors = ATA_MAX_SECTORS;
1346 if (ap->ops->dev_config)
1347 ap->ops->dev_config(ap, dev);
1349 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1353 DPRINTK("EXIT, err\n");
1358 * ata_bus_probe - Reset and probe ATA bus
1361 * Master ATA bus probing function. Initiates a hardware-dependent
1362 * bus reset, then attempts to identify any devices found on
1366 * PCI/etc. bus probe sem.
1369 * Zero on success, negative errno otherwise.
1372 static int ata_bus_probe(struct ata_port *ap)
1374 unsigned int classes[ATA_MAX_DEVICES];
1375 int tries[ATA_MAX_DEVICES];
1376 int i, rc, down_xfermask;
1377 struct ata_device *dev;
1381 for (i = 0; i < ATA_MAX_DEVICES; i++)
1382 tries[i] = ATA_PROBE_MAX_TRIES;
1387 /* reset and determine device classes */
1388 for (i = 0; i < ATA_MAX_DEVICES; i++)
1389 classes[i] = ATA_DEV_UNKNOWN;
1391 if (ap->ops->probe_reset) {
1392 rc = ap->ops->probe_reset(ap, classes);
1394 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1398 ap->ops->phy_reset(ap);
1400 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1401 if (!(ap->flags & ATA_FLAG_DISABLED))
1402 classes[i] = ap->device[i].class;
1403 ap->device[i].class = ATA_DEV_UNKNOWN;
1409 for (i = 0; i < ATA_MAX_DEVICES; i++)
1410 if (classes[i] == ATA_DEV_UNKNOWN)
1411 classes[i] = ATA_DEV_NONE;
1413 /* read IDENTIFY page and configure devices */
1414 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1415 dev = &ap->device[i];
1418 dev->class = classes[i];
1420 if (!ata_dev_enabled(dev))
1425 rc = ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id);
1429 rc = ata_dev_configure(ap, dev, 1);
1434 /* configure transfer mode */
1435 if (ap->ops->set_mode) {
1436 /* FIXME: make ->set_mode handle no device case and
1437 * return error code and failing device on failure as
1438 * ata_set_mode() does.
1440 for (i = 0; i < ATA_MAX_DEVICES; i++)
1441 if (ata_dev_enabled(&ap->device[i])) {
1442 ap->ops->set_mode(ap);
1447 rc = ata_set_mode(ap, &dev);
1454 for (i = 0; i < ATA_MAX_DEVICES; i++)
1455 if (ata_dev_enabled(&ap->device[i]))
1458 /* no device present, disable port */
1459 ata_port_disable(ap);
1460 ap->ops->port_disable(ap);
1467 tries[dev->devno] = 0;
1470 sata_down_spd_limit(ap);
1473 tries[dev->devno]--;
1474 if (down_xfermask &&
1475 ata_down_xfermask_limit(ap, dev, tries[dev->devno] == 1))
1476 tries[dev->devno] = 0;
1479 if (!tries[dev->devno]) {
1480 ata_down_xfermask_limit(ap, dev, 1);
1481 ata_dev_disable(ap, dev);
1488 * ata_port_probe - Mark port as enabled
1489 * @ap: Port for which we indicate enablement
1491 * Modify @ap data structure such that the system
1492 * thinks that the entire port is enabled.
1494 * LOCKING: host_set lock, or some other form of
1498 void ata_port_probe(struct ata_port *ap)
1500 ap->flags &= ~ATA_FLAG_DISABLED;
1504 * sata_print_link_status - Print SATA link status
1505 * @ap: SATA port to printk link status about
1507 * This function prints link speed and status of a SATA link.
1512 static void sata_print_link_status(struct ata_port *ap)
1514 u32 sstatus, scontrol, tmp;
1516 if (!ap->ops->scr_read)
1519 sstatus = scr_read(ap, SCR_STATUS);
1520 scontrol = scr_read(ap, SCR_CONTROL);
1522 if (sata_dev_present(ap)) {
1523 tmp = (sstatus >> 4) & 0xf;
1525 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1526 ap->id, sata_spd_string(tmp), sstatus, scontrol);
1529 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1530 ap->id, sstatus, scontrol);
1535 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1536 * @ap: SATA port associated with target SATA PHY.
1538 * This function issues commands to standard SATA Sxxx
1539 * PHY registers, to wake up the phy (and device), and
1540 * clear any reset condition.
1543 * PCI/etc. bus probe sem.
1546 void __sata_phy_reset(struct ata_port *ap)
1549 unsigned long timeout = jiffies + (HZ * 5);
1551 if (ap->flags & ATA_FLAG_SATA_RESET) {
1552 /* issue phy wake/reset */
1553 scr_write_flush(ap, SCR_CONTROL, 0x301);
1554 /* Couldn't find anything in SATA I/II specs, but
1555 * AHCI-1.1 10.4.2 says at least 1 ms. */
1558 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1560 /* wait for phy to become ready, if necessary */
1563 sstatus = scr_read(ap, SCR_STATUS);
1564 if ((sstatus & 0xf) != 1)
1566 } while (time_before(jiffies, timeout));
1568 /* print link status */
1569 sata_print_link_status(ap);
1571 /* TODO: phy layer with polling, timeouts, etc. */
1572 if (sata_dev_present(ap))
1575 ata_port_disable(ap);
1577 if (ap->flags & ATA_FLAG_DISABLED)
1580 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1581 ata_port_disable(ap);
1585 ap->cbl = ATA_CBL_SATA;
1589 * sata_phy_reset - Reset SATA bus.
1590 * @ap: SATA port associated with target SATA PHY.
1592 * This function resets the SATA bus, and then probes
1593 * the bus for devices.
1596 * PCI/etc. bus probe sem.
1599 void sata_phy_reset(struct ata_port *ap)
1601 __sata_phy_reset(ap);
1602 if (ap->flags & ATA_FLAG_DISABLED)
1608 * ata_dev_pair - return other device on cable
1612 * Obtain the other device on the same cable, or if none is
1613 * present NULL is returned
1616 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1618 struct ata_device *pair = &ap->device[1 - adev->devno];
1619 if (!ata_dev_enabled(pair))
1625 * ata_port_disable - Disable port.
1626 * @ap: Port to be disabled.
1628 * Modify @ap data structure such that the system
1629 * thinks that the entire port is disabled, and should
1630 * never attempt to probe or communicate with devices
1633 * LOCKING: host_set lock, or some other form of
1637 void ata_port_disable(struct ata_port *ap)
1639 ap->device[0].class = ATA_DEV_NONE;
1640 ap->device[1].class = ATA_DEV_NONE;
1641 ap->flags |= ATA_FLAG_DISABLED;
1645 * sata_down_spd_limit - adjust SATA spd limit downward
1646 * @ap: Port to adjust SATA spd limit for
1648 * Adjust SATA spd limit of @ap downward. Note that this
1649 * function only adjusts the limit. The change must be applied
1650 * using sata_set_spd().
1653 * Inherited from caller.
1656 * 0 on success, negative errno on failure
1658 int sata_down_spd_limit(struct ata_port *ap)
1663 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1666 mask = ap->sata_spd_limit;
1669 highbit = fls(mask) - 1;
1670 mask &= ~(1 << highbit);
1672 spd = (scr_read(ap, SCR_STATUS) >> 4) & 0xf;
1676 mask &= (1 << spd) - 1;
1680 ap->sata_spd_limit = mask;
1682 printk(KERN_WARNING "ata%u: limiting SATA link speed to %s\n",
1683 ap->id, sata_spd_string(fls(mask)));
1688 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1692 if (ap->sata_spd_limit == UINT_MAX)
1695 limit = fls(ap->sata_spd_limit);
1697 spd = (*scontrol >> 4) & 0xf;
1698 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1700 return spd != limit;
1704 * sata_set_spd_needed - is SATA spd configuration needed
1705 * @ap: Port in question
1707 * Test whether the spd limit in SControl matches
1708 * @ap->sata_spd_limit. This function is used to determine
1709 * whether hardreset is necessary to apply SATA spd
1713 * Inherited from caller.
1716 * 1 if SATA spd configuration is needed, 0 otherwise.
1718 int sata_set_spd_needed(struct ata_port *ap)
1722 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1725 scontrol = scr_read(ap, SCR_CONTROL);
1727 return __sata_set_spd_needed(ap, &scontrol);
1731 * sata_set_spd - set SATA spd according to spd limit
1732 * @ap: Port to set SATA spd for
1734 * Set SATA spd of @ap according to sata_spd_limit.
1737 * Inherited from caller.
1740 * 0 if spd doesn't need to be changed, 1 if spd has been
1741 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1743 int sata_set_spd(struct ata_port *ap)
1747 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1750 scontrol = scr_read(ap, SCR_CONTROL);
1751 if (!__sata_set_spd_needed(ap, &scontrol))
1754 scr_write(ap, SCR_CONTROL, scontrol);
1759 * This mode timing computation functionality is ported over from
1760 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1763 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1764 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1765 * for PIO 5, which is a nonstandard extension and UDMA6, which
1766 * is currently supported only by Maxtor drives.
1769 static const struct ata_timing ata_timing[] = {
1771 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1772 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1773 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1774 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1776 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1777 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1778 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1780 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1782 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1783 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1784 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1786 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1787 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1788 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1790 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1791 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1792 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1794 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1795 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1796 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1798 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1803 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1804 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1806 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1808 q->setup = EZ(t->setup * 1000, T);
1809 q->act8b = EZ(t->act8b * 1000, T);
1810 q->rec8b = EZ(t->rec8b * 1000, T);
1811 q->cyc8b = EZ(t->cyc8b * 1000, T);
1812 q->active = EZ(t->active * 1000, T);
1813 q->recover = EZ(t->recover * 1000, T);
1814 q->cycle = EZ(t->cycle * 1000, T);
1815 q->udma = EZ(t->udma * 1000, UT);
1818 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1819 struct ata_timing *m, unsigned int what)
1821 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1822 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1823 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1824 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1825 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1826 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1827 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1828 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1831 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1833 const struct ata_timing *t;
1835 for (t = ata_timing; t->mode != speed; t++)
1836 if (t->mode == 0xFF)
1841 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1842 struct ata_timing *t, int T, int UT)
1844 const struct ata_timing *s;
1845 struct ata_timing p;
1851 if (!(s = ata_timing_find_mode(speed)))
1854 memcpy(t, s, sizeof(*s));
1857 * If the drive is an EIDE drive, it can tell us it needs extended
1858 * PIO/MW_DMA cycle timing.
1861 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1862 memset(&p, 0, sizeof(p));
1863 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1864 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1865 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1866 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1867 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1869 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1873 * Convert the timing to bus clock counts.
1876 ata_timing_quantize(t, t, T, UT);
1879 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1880 * S.M.A.R.T * and some other commands. We have to ensure that the
1881 * DMA cycle timing is slower/equal than the fastest PIO timing.
1884 if (speed > XFER_PIO_4) {
1885 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1886 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1890 * Lengthen active & recovery time so that cycle time is correct.
1893 if (t->act8b + t->rec8b < t->cyc8b) {
1894 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1895 t->rec8b = t->cyc8b - t->act8b;
1898 if (t->active + t->recover < t->cycle) {
1899 t->active += (t->cycle - (t->active + t->recover)) / 2;
1900 t->recover = t->cycle - t->active;
1907 * ata_down_xfermask_limit - adjust dev xfer masks downward
1908 * @ap: Port associated with device @dev
1909 * @dev: Device to adjust xfer masks
1910 * @force_pio0: Force PIO0
1912 * Adjust xfer masks of @dev downward. Note that this function
1913 * does not apply the change. Invoking ata_set_mode() afterwards
1914 * will apply the limit.
1917 * Inherited from caller.
1920 * 0 on success, negative errno on failure
1922 int ata_down_xfermask_limit(struct ata_port *ap, struct ata_device *dev,
1925 unsigned long xfer_mask;
1928 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1933 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1934 if (xfer_mask & ATA_MASK_UDMA)
1935 xfer_mask &= ~ATA_MASK_MWDMA;
1937 highbit = fls(xfer_mask) - 1;
1938 xfer_mask &= ~(1 << highbit);
1940 xfer_mask &= 1 << ATA_SHIFT_PIO;
1944 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1947 printk(KERN_WARNING "ata%u: dev %u limiting speed to %s\n",
1948 ap->id, dev->devno, ata_mode_string(xfer_mask));
1956 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1958 unsigned int err_mask;
1961 dev->flags &= ~ATA_DFLAG_PIO;
1962 if (dev->xfer_shift == ATA_SHIFT_PIO)
1963 dev->flags |= ATA_DFLAG_PIO;
1965 err_mask = ata_dev_set_xfermode(ap, dev);
1968 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1973 rc = ata_dev_revalidate(ap, dev, 0);
1977 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1978 dev->xfer_shift, (int)dev->xfer_mode);
1980 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1982 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1987 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1988 * @ap: port on which timings will be programmed
1989 * @r_failed_dev: out paramter for failed device
1991 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1992 * ata_set_mode() fails, pointer to the failing device is
1993 * returned in @r_failed_dev.
1996 * PCI/etc. bus probe sem.
1999 * 0 on success, negative errno otherwise
2001 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2003 struct ata_device *dev;
2004 int i, rc = 0, used_dma = 0, found = 0;
2006 /* step 1: calculate xfer_mask */
2007 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2008 unsigned int pio_mask, dma_mask;
2010 dev = &ap->device[i];
2012 if (!ata_dev_enabled(dev))
2015 ata_dev_xfermask(ap, dev);
2017 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2018 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2019 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2020 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2029 /* step 2: always set host PIO timings */
2030 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2031 dev = &ap->device[i];
2032 if (!ata_dev_enabled(dev))
2035 if (!dev->pio_mode) {
2036 printk(KERN_WARNING "ata%u: dev %u no PIO support\n",
2037 ap->id, dev->devno);
2042 dev->xfer_mode = dev->pio_mode;
2043 dev->xfer_shift = ATA_SHIFT_PIO;
2044 if (ap->ops->set_piomode)
2045 ap->ops->set_piomode(ap, dev);
2048 /* step 3: set host DMA timings */
2049 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2050 dev = &ap->device[i];
2052 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2055 dev->xfer_mode = dev->dma_mode;
2056 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2057 if (ap->ops->set_dmamode)
2058 ap->ops->set_dmamode(ap, dev);
2061 /* step 4: update devices' xfer mode */
2062 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2063 dev = &ap->device[i];
2065 if (!ata_dev_enabled(dev))
2068 rc = ata_dev_set_mode(ap, dev);
2073 /* Record simplex status. If we selected DMA then the other
2074 * host channels are not permitted to do so.
2076 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2077 ap->host_set->simplex_claimed = 1;
2079 /* step5: chip specific finalisation */
2080 if (ap->ops->post_set_mode)
2081 ap->ops->post_set_mode(ap);
2085 *r_failed_dev = dev;
2090 * ata_tf_to_host - issue ATA taskfile to host controller
2091 * @ap: port to which command is being issued
2092 * @tf: ATA taskfile register set
2094 * Issues ATA taskfile register set to ATA host controller,
2095 * with proper synchronization with interrupt handler and
2099 * spin_lock_irqsave(host_set lock)
2102 static inline void ata_tf_to_host(struct ata_port *ap,
2103 const struct ata_taskfile *tf)
2105 ap->ops->tf_load(ap, tf);
2106 ap->ops->exec_command(ap, tf);
2110 * ata_busy_sleep - sleep until BSY clears, or timeout
2111 * @ap: port containing status register to be polled
2112 * @tmout_pat: impatience timeout
2113 * @tmout: overall timeout
2115 * Sleep until ATA Status register bit BSY clears,
2116 * or a timeout occurs.
2121 unsigned int ata_busy_sleep (struct ata_port *ap,
2122 unsigned long tmout_pat, unsigned long tmout)
2124 unsigned long timer_start, timeout;
2127 status = ata_busy_wait(ap, ATA_BUSY, 300);
2128 timer_start = jiffies;
2129 timeout = timer_start + tmout_pat;
2130 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2132 status = ata_busy_wait(ap, ATA_BUSY, 3);
2135 if (status & ATA_BUSY)
2136 printk(KERN_WARNING "ata%u is slow to respond, "
2137 "please be patient\n", ap->id);
2139 timeout = timer_start + tmout;
2140 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2142 status = ata_chk_status(ap);
2145 if (status & ATA_BUSY) {
2146 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
2147 ap->id, tmout / HZ);
2154 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2156 struct ata_ioports *ioaddr = &ap->ioaddr;
2157 unsigned int dev0 = devmask & (1 << 0);
2158 unsigned int dev1 = devmask & (1 << 1);
2159 unsigned long timeout;
2161 /* if device 0 was found in ata_devchk, wait for its
2165 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2167 /* if device 1 was found in ata_devchk, wait for
2168 * register access, then wait for BSY to clear
2170 timeout = jiffies + ATA_TMOUT_BOOT;
2174 ap->ops->dev_select(ap, 1);
2175 if (ap->flags & ATA_FLAG_MMIO) {
2176 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2177 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2179 nsect = inb(ioaddr->nsect_addr);
2180 lbal = inb(ioaddr->lbal_addr);
2182 if ((nsect == 1) && (lbal == 1))
2184 if (time_after(jiffies, timeout)) {
2188 msleep(50); /* give drive a breather */
2191 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2193 /* is all this really necessary? */
2194 ap->ops->dev_select(ap, 0);
2196 ap->ops->dev_select(ap, 1);
2198 ap->ops->dev_select(ap, 0);
2201 static unsigned int ata_bus_softreset(struct ata_port *ap,
2202 unsigned int devmask)
2204 struct ata_ioports *ioaddr = &ap->ioaddr;
2206 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2208 /* software reset. causes dev0 to be selected */
2209 if (ap->flags & ATA_FLAG_MMIO) {
2210 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2211 udelay(20); /* FIXME: flush */
2212 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2213 udelay(20); /* FIXME: flush */
2214 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2216 outb(ap->ctl, ioaddr->ctl_addr);
2218 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2220 outb(ap->ctl, ioaddr->ctl_addr);
2223 /* spec mandates ">= 2ms" before checking status.
2224 * We wait 150ms, because that was the magic delay used for
2225 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2226 * between when the ATA command register is written, and then
2227 * status is checked. Because waiting for "a while" before
2228 * checking status is fine, post SRST, we perform this magic
2229 * delay here as well.
2231 * Old drivers/ide uses the 2mS rule and then waits for ready
2235 /* Before we perform post reset processing we want to see if
2236 * the bus shows 0xFF because the odd clown forgets the D7
2237 * pulldown resistor.
2239 if (ata_check_status(ap) == 0xFF) {
2240 printk(KERN_ERR "ata%u: SRST failed (status 0xFF)\n", ap->id);
2241 return AC_ERR_OTHER;
2244 ata_bus_post_reset(ap, devmask);
2250 * ata_bus_reset - reset host port and associated ATA channel
2251 * @ap: port to reset
2253 * This is typically the first time we actually start issuing
2254 * commands to the ATA channel. We wait for BSY to clear, then
2255 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2256 * result. Determine what devices, if any, are on the channel
2257 * by looking at the device 0/1 error register. Look at the signature
2258 * stored in each device's taskfile registers, to determine if
2259 * the device is ATA or ATAPI.
2262 * PCI/etc. bus probe sem.
2263 * Obtains host_set lock.
2266 * Sets ATA_FLAG_DISABLED if bus reset fails.
2269 void ata_bus_reset(struct ata_port *ap)
2271 struct ata_ioports *ioaddr = &ap->ioaddr;
2272 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2274 unsigned int dev0, dev1 = 0, devmask = 0;
2276 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2278 /* determine if device 0/1 are present */
2279 if (ap->flags & ATA_FLAG_SATA_RESET)
2282 dev0 = ata_devchk(ap, 0);
2284 dev1 = ata_devchk(ap, 1);
2288 devmask |= (1 << 0);
2290 devmask |= (1 << 1);
2292 /* select device 0 again */
2293 ap->ops->dev_select(ap, 0);
2295 /* issue bus reset */
2296 if (ap->flags & ATA_FLAG_SRST)
2297 if (ata_bus_softreset(ap, devmask))
2301 * determine by signature whether we have ATA or ATAPI devices
2303 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2304 if ((slave_possible) && (err != 0x81))
2305 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2307 /* re-enable interrupts */
2308 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2311 /* is double-select really necessary? */
2312 if (ap->device[1].class != ATA_DEV_NONE)
2313 ap->ops->dev_select(ap, 1);
2314 if (ap->device[0].class != ATA_DEV_NONE)
2315 ap->ops->dev_select(ap, 0);
2317 /* if no devices were detected, disable this port */
2318 if ((ap->device[0].class == ATA_DEV_NONE) &&
2319 (ap->device[1].class == ATA_DEV_NONE))
2322 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2323 /* set up device control for ATA_FLAG_SATA_RESET */
2324 if (ap->flags & ATA_FLAG_MMIO)
2325 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2327 outb(ap->ctl, ioaddr->ctl_addr);
2334 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2335 ap->ops->port_disable(ap);
2340 static int sata_phy_resume(struct ata_port *ap)
2342 unsigned long timeout = jiffies + (HZ * 5);
2343 u32 scontrol, sstatus;
2345 scontrol = scr_read(ap, SCR_CONTROL);
2346 scontrol = (scontrol & 0x0f0) | 0x300;
2347 scr_write_flush(ap, SCR_CONTROL, scontrol);
2349 /* Wait for phy to become ready, if necessary. */
2352 sstatus = scr_read(ap, SCR_STATUS);
2353 if ((sstatus & 0xf) != 1)
2355 } while (time_before(jiffies, timeout));
2361 * ata_std_probeinit - initialize probing
2362 * @ap: port to be probed
2364 * @ap is about to be probed. Initialize it. This function is
2365 * to be used as standard callback for ata_drive_probe_reset().
2367 * NOTE!!! Do not use this function as probeinit if a low level
2368 * driver implements only hardreset. Just pass NULL as probeinit
2369 * in that case. Using this function is probably okay but doing
2370 * so makes reset sequence different from the original
2371 * ->phy_reset implementation and Jeff nervous. :-P
2373 void ata_std_probeinit(struct ata_port *ap)
2375 if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
2378 /* set cable type and resume link */
2379 ap->cbl = ATA_CBL_SATA;
2380 sata_phy_resume(ap);
2382 /* init sata_spd_limit to the current value */
2383 spd = (scr_read(ap, SCR_CONTROL) & 0xf0) >> 4;
2385 ap->sata_spd_limit &= (1 << spd) - 1;
2387 /* wait for device */
2388 if (sata_dev_present(ap))
2389 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2394 * ata_std_softreset - reset host port via ATA SRST
2395 * @ap: port to reset
2396 * @classes: resulting classes of attached devices
2398 * Reset host port using ATA SRST. This function is to be used
2399 * as standard callback for ata_drive_*_reset() functions.
2402 * Kernel thread context (may sleep)
2405 * 0 on success, -errno otherwise.
2407 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2409 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2410 unsigned int devmask = 0, err_mask;
2415 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2416 classes[0] = ATA_DEV_NONE;
2420 /* determine if device 0/1 are present */
2421 if (ata_devchk(ap, 0))
2422 devmask |= (1 << 0);
2423 if (slave_possible && ata_devchk(ap, 1))
2424 devmask |= (1 << 1);
2426 /* select device 0 again */
2427 ap->ops->dev_select(ap, 0);
2429 /* issue bus reset */
2430 DPRINTK("about to softreset, devmask=%x\n", devmask);
2431 err_mask = ata_bus_softreset(ap, devmask);
2433 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2438 /* determine by signature whether we have ATA or ATAPI devices */
2439 classes[0] = ata_dev_try_classify(ap, 0, &err);
2440 if (slave_possible && err != 0x81)
2441 classes[1] = ata_dev_try_classify(ap, 1, &err);
2444 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2449 * sata_std_hardreset - reset host port via SATA phy reset
2450 * @ap: port to reset
2451 * @class: resulting class of attached device
2453 * SATA phy-reset host port using DET bits of SControl register.
2454 * This function is to be used as standard callback for
2455 * ata_drive_*_reset().
2458 * Kernel thread context (may sleep)
2461 * 0 on success, -errno otherwise.
2463 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2469 if (sata_set_spd_needed(ap)) {
2470 /* SATA spec says nothing about how to reconfigure
2471 * spd. To be on the safe side, turn off phy during
2472 * reconfiguration. This works for at least ICH7 AHCI
2475 scontrol = scr_read(ap, SCR_CONTROL);
2476 scontrol = (scontrol & 0x0f0) | 0x302;
2477 scr_write_flush(ap, SCR_CONTROL, scontrol);
2482 /* issue phy wake/reset */
2483 scontrol = scr_read(ap, SCR_CONTROL);
2484 scontrol = (scontrol & 0x0f0) | 0x301;
2485 scr_write_flush(ap, SCR_CONTROL, scontrol);
2487 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2488 * 10.4.2 says at least 1 ms.
2492 /* bring phy back */
2493 sata_phy_resume(ap);
2495 /* TODO: phy layer with polling, timeouts, etc. */
2496 if (!sata_dev_present(ap)) {
2497 *class = ATA_DEV_NONE;
2498 DPRINTK("EXIT, link offline\n");
2502 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2504 "ata%u: COMRESET failed (device not ready)\n", ap->id);
2508 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2510 *class = ata_dev_try_classify(ap, 0, NULL);
2512 DPRINTK("EXIT, class=%u\n", *class);
2517 * ata_std_postreset - standard postreset callback
2518 * @ap: the target ata_port
2519 * @classes: classes of attached devices
2521 * This function is invoked after a successful reset. Note that
2522 * the device might have been reset more than once using
2523 * different reset methods before postreset is invoked.
2525 * This function is to be used as standard callback for
2526 * ata_drive_*_reset().
2529 * Kernel thread context (may sleep)
2531 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2535 /* print link status */
2536 if (ap->cbl == ATA_CBL_SATA)
2537 sata_print_link_status(ap);
2539 /* re-enable interrupts */
2540 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2543 /* is double-select really necessary? */
2544 if (classes[0] != ATA_DEV_NONE)
2545 ap->ops->dev_select(ap, 1);
2546 if (classes[1] != ATA_DEV_NONE)
2547 ap->ops->dev_select(ap, 0);
2549 /* bail out if no device is present */
2550 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2551 DPRINTK("EXIT, no device\n");
2555 /* set up device control */
2556 if (ap->ioaddr.ctl_addr) {
2557 if (ap->flags & ATA_FLAG_MMIO)
2558 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2560 outb(ap->ctl, ap->ioaddr.ctl_addr);
2567 * ata_std_probe_reset - standard probe reset method
2568 * @ap: prot to perform probe-reset
2569 * @classes: resulting classes of attached devices
2571 * The stock off-the-shelf ->probe_reset method.
2574 * Kernel thread context (may sleep)
2577 * 0 on success, -errno otherwise.
2579 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2581 ata_reset_fn_t hardreset;
2584 if (ap->cbl == ATA_CBL_SATA && ap->ops->scr_read)
2585 hardreset = sata_std_hardreset;
2587 return ata_drive_probe_reset(ap, ata_std_probeinit,
2588 ata_std_softreset, hardreset,
2589 ata_std_postreset, classes);
2592 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2593 ata_postreset_fn_t postreset, unsigned int *classes)
2597 for (i = 0; i < ATA_MAX_DEVICES; i++)
2598 classes[i] = ATA_DEV_UNKNOWN;
2600 rc = reset(ap, classes);
2604 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2605 * is complete and convert all ATA_DEV_UNKNOWN to
2608 for (i = 0; i < ATA_MAX_DEVICES; i++)
2609 if (classes[i] != ATA_DEV_UNKNOWN)
2612 if (i < ATA_MAX_DEVICES)
2613 for (i = 0; i < ATA_MAX_DEVICES; i++)
2614 if (classes[i] == ATA_DEV_UNKNOWN)
2615 classes[i] = ATA_DEV_NONE;
2618 postreset(ap, classes);
2624 * ata_drive_probe_reset - Perform probe reset with given methods
2625 * @ap: port to reset
2626 * @probeinit: probeinit method (can be NULL)
2627 * @softreset: softreset method (can be NULL)
2628 * @hardreset: hardreset method (can be NULL)
2629 * @postreset: postreset method (can be NULL)
2630 * @classes: resulting classes of attached devices
2632 * Reset the specified port and classify attached devices using
2633 * given methods. This function prefers softreset but tries all
2634 * possible reset sequences to reset and classify devices. This
2635 * function is intended to be used for constructing ->probe_reset
2636 * callback by low level drivers.
2638 * Reset methods should follow the following rules.
2640 * - Return 0 on sucess, -errno on failure.
2641 * - If classification is supported, fill classes[] with
2642 * recognized class codes.
2643 * - If classification is not supported, leave classes[] alone.
2646 * Kernel thread context (may sleep)
2649 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2650 * if classification fails, and any error code from reset
2653 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2654 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2655 ata_postreset_fn_t postreset, unsigned int *classes)
2662 if (softreset && !sata_set_spd_needed(ap)) {
2663 rc = ata_do_reset(ap, softreset, postreset, classes);
2664 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2666 printk(KERN_INFO "ata%u: softreset failed, will try "
2667 "hardreset in 5 secs\n", ap->id);
2675 rc = ata_do_reset(ap, hardreset, postreset, classes);
2677 if (classes[0] != ATA_DEV_UNKNOWN)
2682 if (sata_down_spd_limit(ap))
2685 printk(KERN_INFO "ata%u: hardreset failed, will retry "
2686 "in 5 secs\n", ap->id);
2691 printk(KERN_INFO "ata%u: hardreset succeeded without "
2692 "classification, will retry softreset in 5 secs\n",
2696 rc = ata_do_reset(ap, softreset, postreset, classes);
2700 if (rc == 0 && classes[0] == ATA_DEV_UNKNOWN)
2706 * ata_dev_same_device - Determine whether new ID matches configured device
2707 * @ap: port on which the device to compare against resides
2708 * @dev: device to compare against
2709 * @new_class: class of the new device
2710 * @new_id: IDENTIFY page of the new device
2712 * Compare @new_class and @new_id against @dev and determine
2713 * whether @dev is the device indicated by @new_class and
2720 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2722 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2723 unsigned int new_class, const u16 *new_id)
2725 const u16 *old_id = dev->id;
2726 unsigned char model[2][41], serial[2][21];
2729 if (dev->class != new_class) {
2731 "ata%u: dev %u class mismatch %d != %d\n",
2732 ap->id, dev->devno, dev->class, new_class);
2736 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2737 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2738 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2739 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2740 new_n_sectors = ata_id_n_sectors(new_id);
2742 if (strcmp(model[0], model[1])) {
2744 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2745 ap->id, dev->devno, model[0], model[1]);
2749 if (strcmp(serial[0], serial[1])) {
2751 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2752 ap->id, dev->devno, serial[0], serial[1]);
2756 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2758 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2759 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2760 (unsigned long long)new_n_sectors);
2768 * ata_dev_revalidate - Revalidate ATA device
2769 * @ap: port on which the device to revalidate resides
2770 * @dev: device to revalidate
2771 * @post_reset: is this revalidation after reset?
2773 * Re-read IDENTIFY page and make sure @dev is still attached to
2777 * Kernel thread context (may sleep)
2780 * 0 on success, negative errno otherwise
2782 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2785 unsigned int class = dev->class;
2789 if (!ata_dev_enabled(dev)) {
2794 /* allocate & read ID data */
2795 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2799 /* is the device still there? */
2800 if (!ata_dev_same_device(ap, dev, class, id)) {
2808 /* configure device according to the new ID */
2809 rc = ata_dev_configure(ap, dev, 0);
2814 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2815 ap->id, dev->devno, rc);
2820 static const char * const ata_dma_blacklist [] = {
2821 "WDC AC11000H", NULL,
2822 "WDC AC22100H", NULL,
2823 "WDC AC32500H", NULL,
2824 "WDC AC33100H", NULL,
2825 "WDC AC31600H", NULL,
2826 "WDC AC32100H", "24.09P07",
2827 "WDC AC23200L", "21.10N21",
2828 "Compaq CRD-8241B", NULL,
2833 "SanDisk SDP3B", NULL,
2834 "SanDisk SDP3B-64", NULL,
2835 "SANYO CD-ROM CRD", NULL,
2836 "HITACHI CDR-8", NULL,
2837 "HITACHI CDR-8335", NULL,
2838 "HITACHI CDR-8435", NULL,
2839 "Toshiba CD-ROM XM-6202B", NULL,
2840 "TOSHIBA CD-ROM XM-1702BC", NULL,
2842 "E-IDE CD-ROM CR-840", NULL,
2843 "CD-ROM Drive/F5A", NULL,
2844 "WPI CDD-820", NULL,
2845 "SAMSUNG CD-ROM SC-148C", NULL,
2846 "SAMSUNG CD-ROM SC", NULL,
2847 "SanDisk SDP3B-64", NULL,
2848 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2849 "_NEC DV5800A", NULL,
2850 "SAMSUNG CD-ROM SN-124", "N001"
2853 static int ata_strim(char *s, size_t len)
2855 len = strnlen(s, len);
2857 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2858 while ((len > 0) && (s[len - 1] == ' ')) {
2865 static int ata_dma_blacklisted(const struct ata_device *dev)
2867 unsigned char model_num[40];
2868 unsigned char model_rev[16];
2869 unsigned int nlen, rlen;
2872 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2874 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2876 nlen = ata_strim(model_num, sizeof(model_num));
2877 rlen = ata_strim(model_rev, sizeof(model_rev));
2879 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2880 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2881 if (ata_dma_blacklist[i+1] == NULL)
2883 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2891 * ata_dev_xfermask - Compute supported xfermask of the given device
2892 * @ap: Port on which the device to compute xfermask for resides
2893 * @dev: Device to compute xfermask for
2895 * Compute supported xfermask of @dev and store it in
2896 * dev->*_mask. This function is responsible for applying all
2897 * known limits including host controller limits, device
2900 * FIXME: The current implementation limits all transfer modes to
2901 * the fastest of the lowested device on the port. This is not
2902 * required on most controllers.
2907 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2909 struct ata_host_set *hs = ap->host_set;
2910 unsigned long xfer_mask;
2913 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2914 ap->mwdma_mask, ap->udma_mask);
2916 /* Apply cable rule here. Don't apply it early because when
2917 * we handle hot plug the cable type can itself change.
2919 if (ap->cbl == ATA_CBL_PATA40)
2920 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2922 /* FIXME: Use port-wide xfermask for now */
2923 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2924 struct ata_device *d = &ap->device[i];
2926 if (ata_dev_absent(d))
2929 if (ata_dev_disabled(d)) {
2930 /* to avoid violating device selection timing */
2931 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2932 UINT_MAX, UINT_MAX);
2936 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2937 d->mwdma_mask, d->udma_mask);
2938 xfer_mask &= ata_id_xfermask(d->id);
2939 if (ata_dma_blacklisted(d))
2940 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2943 if (ata_dma_blacklisted(dev))
2944 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2945 "disabling DMA\n", ap->id, dev->devno);
2947 if (hs->flags & ATA_HOST_SIMPLEX) {
2948 if (hs->simplex_claimed)
2949 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2952 if (ap->ops->mode_filter)
2953 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2955 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
2956 &dev->mwdma_mask, &dev->udma_mask);
2960 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2961 * @ap: Port associated with device @dev
2962 * @dev: Device to which command will be sent
2964 * Issue SET FEATURES - XFER MODE command to device @dev
2968 * PCI/etc. bus probe sem.
2971 * 0 on success, AC_ERR_* mask otherwise.
2974 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2975 struct ata_device *dev)
2977 struct ata_taskfile tf;
2978 unsigned int err_mask;
2980 /* set up set-features taskfile */
2981 DPRINTK("set features - xfer mode\n");
2983 ata_tf_init(ap, &tf, dev->devno);
2984 tf.command = ATA_CMD_SET_FEATURES;
2985 tf.feature = SETFEATURES_XFER;
2986 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2987 tf.protocol = ATA_PROT_NODATA;
2988 tf.nsect = dev->xfer_mode;
2990 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
2992 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2997 * ata_dev_init_params - Issue INIT DEV PARAMS command
2998 * @ap: Port associated with device @dev
2999 * @dev: Device to which command will be sent
3002 * Kernel thread context (may sleep)
3005 * 0 on success, AC_ERR_* mask otherwise.
3008 static unsigned int ata_dev_init_params(struct ata_port *ap,
3009 struct ata_device *dev,
3013 struct ata_taskfile tf;
3014 unsigned int err_mask;
3016 /* Number of sectors per track 1-255. Number of heads 1-16 */
3017 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3018 return AC_ERR_INVALID;
3020 /* set up init dev params taskfile */
3021 DPRINTK("init dev params \n");
3023 ata_tf_init(ap, &tf, dev->devno);
3024 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3025 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3026 tf.protocol = ATA_PROT_NODATA;
3028 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3030 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
3032 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3037 * ata_sg_clean - Unmap DMA memory associated with command
3038 * @qc: Command containing DMA memory to be released
3040 * Unmap all mapped DMA memory associated with this command.
3043 * spin_lock_irqsave(host_set lock)
3046 static void ata_sg_clean(struct ata_queued_cmd *qc)
3048 struct ata_port *ap = qc->ap;
3049 struct scatterlist *sg = qc->__sg;
3050 int dir = qc->dma_dir;
3051 void *pad_buf = NULL;
3053 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3054 WARN_ON(sg == NULL);
3056 if (qc->flags & ATA_QCFLAG_SINGLE)
3057 WARN_ON(qc->n_elem > 1);
3059 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3061 /* if we padded the buffer out to 32-bit bound, and data
3062 * xfer direction is from-device, we must copy from the
3063 * pad buffer back into the supplied buffer
3065 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3066 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3068 if (qc->flags & ATA_QCFLAG_SG) {
3070 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3071 /* restore last sg */
3072 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3074 struct scatterlist *psg = &qc->pad_sgent;
3075 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3076 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3077 kunmap_atomic(addr, KM_IRQ0);
3081 dma_unmap_single(ap->dev,
3082 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3085 sg->length += qc->pad_len;
3087 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3088 pad_buf, qc->pad_len);
3091 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3096 * ata_fill_sg - Fill PCI IDE PRD table
3097 * @qc: Metadata associated with taskfile to be transferred
3099 * Fill PCI IDE PRD (scatter-gather) table with segments
3100 * associated with the current disk command.
3103 * spin_lock_irqsave(host_set lock)
3106 static void ata_fill_sg(struct ata_queued_cmd *qc)
3108 struct ata_port *ap = qc->ap;
3109 struct scatterlist *sg;
3112 WARN_ON(qc->__sg == NULL);
3113 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3116 ata_for_each_sg(sg, qc) {
3120 /* determine if physical DMA addr spans 64K boundary.
3121 * Note h/w doesn't support 64-bit, so we unconditionally
3122 * truncate dma_addr_t to u32.
3124 addr = (u32) sg_dma_address(sg);
3125 sg_len = sg_dma_len(sg);
3128 offset = addr & 0xffff;
3130 if ((offset + sg_len) > 0x10000)
3131 len = 0x10000 - offset;
3133 ap->prd[idx].addr = cpu_to_le32(addr);
3134 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3135 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3144 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3147 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3148 * @qc: Metadata associated with taskfile to check
3150 * Allow low-level driver to filter ATA PACKET commands, returning
3151 * a status indicating whether or not it is OK to use DMA for the
3152 * supplied PACKET command.
3155 * spin_lock_irqsave(host_set lock)
3157 * RETURNS: 0 when ATAPI DMA can be used
3160 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3162 struct ata_port *ap = qc->ap;
3163 int rc = 0; /* Assume ATAPI DMA is OK by default */
3165 if (ap->ops->check_atapi_dma)
3166 rc = ap->ops->check_atapi_dma(qc);
3171 * ata_qc_prep - Prepare taskfile for submission
3172 * @qc: Metadata associated with taskfile to be prepared
3174 * Prepare ATA taskfile for submission.
3177 * spin_lock_irqsave(host_set lock)
3179 void ata_qc_prep(struct ata_queued_cmd *qc)
3181 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3187 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3190 * ata_sg_init_one - Associate command with memory buffer
3191 * @qc: Command to be associated
3192 * @buf: Memory buffer
3193 * @buflen: Length of memory buffer, in bytes.
3195 * Initialize the data-related elements of queued_cmd @qc
3196 * to point to a single memory buffer, @buf of byte length @buflen.
3199 * spin_lock_irqsave(host_set lock)
3202 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3204 struct scatterlist *sg;
3206 qc->flags |= ATA_QCFLAG_SINGLE;
3208 memset(&qc->sgent, 0, sizeof(qc->sgent));
3209 qc->__sg = &qc->sgent;
3211 qc->orig_n_elem = 1;
3215 sg_init_one(sg, buf, buflen);
3219 * ata_sg_init - Associate command with scatter-gather table.
3220 * @qc: Command to be associated
3221 * @sg: Scatter-gather table.
3222 * @n_elem: Number of elements in s/g table.
3224 * Initialize the data-related elements of queued_cmd @qc
3225 * to point to a scatter-gather table @sg, containing @n_elem
3229 * spin_lock_irqsave(host_set lock)
3232 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3233 unsigned int n_elem)
3235 qc->flags |= ATA_QCFLAG_SG;
3237 qc->n_elem = n_elem;
3238 qc->orig_n_elem = n_elem;
3242 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3243 * @qc: Command with memory buffer to be mapped.
3245 * DMA-map the memory buffer associated with queued_cmd @qc.
3248 * spin_lock_irqsave(host_set lock)
3251 * Zero on success, negative on error.
3254 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3256 struct ata_port *ap = qc->ap;
3257 int dir = qc->dma_dir;
3258 struct scatterlist *sg = qc->__sg;
3259 dma_addr_t dma_address;
3262 /* we must lengthen transfers to end on a 32-bit boundary */
3263 qc->pad_len = sg->length & 3;
3265 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3266 struct scatterlist *psg = &qc->pad_sgent;
3268 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3270 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3272 if (qc->tf.flags & ATA_TFLAG_WRITE)
3273 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3276 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3277 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3279 sg->length -= qc->pad_len;
3280 if (sg->length == 0)
3283 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3284 sg->length, qc->pad_len);
3292 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3294 if (dma_mapping_error(dma_address)) {
3296 sg->length += qc->pad_len;
3300 sg_dma_address(sg) = dma_address;
3301 sg_dma_len(sg) = sg->length;
3304 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3305 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3311 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3312 * @qc: Command with scatter-gather table to be mapped.
3314 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3317 * spin_lock_irqsave(host_set lock)
3320 * Zero on success, negative on error.
3324 static int ata_sg_setup(struct ata_queued_cmd *qc)
3326 struct ata_port *ap = qc->ap;
3327 struct scatterlist *sg = qc->__sg;
3328 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3329 int n_elem, pre_n_elem, dir, trim_sg = 0;
3331 VPRINTK("ENTER, ata%u\n", ap->id);
3332 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3334 /* we must lengthen transfers to end on a 32-bit boundary */
3335 qc->pad_len = lsg->length & 3;
3337 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3338 struct scatterlist *psg = &qc->pad_sgent;
3339 unsigned int offset;
3341 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3343 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3346 * psg->page/offset are used to copy to-be-written
3347 * data in this function or read data in ata_sg_clean.
3349 offset = lsg->offset + lsg->length - qc->pad_len;
3350 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3351 psg->offset = offset_in_page(offset);
3353 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3354 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3355 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3356 kunmap_atomic(addr, KM_IRQ0);
3359 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3360 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3362 lsg->length -= qc->pad_len;
3363 if (lsg->length == 0)
3366 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3367 qc->n_elem - 1, lsg->length, qc->pad_len);
3370 pre_n_elem = qc->n_elem;
3371 if (trim_sg && pre_n_elem)
3380 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3382 /* restore last sg */
3383 lsg->length += qc->pad_len;
3387 DPRINTK("%d sg elements mapped\n", n_elem);
3390 qc->n_elem = n_elem;
3396 * ata_poll_qc_complete - turn irq back on and finish qc
3397 * @qc: Command to complete
3398 * @err_mask: ATA status register content
3401 * None. (grabs host lock)
3404 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3406 struct ata_port *ap = qc->ap;
3407 unsigned long flags;
3409 spin_lock_irqsave(&ap->host_set->lock, flags);
3410 ap->flags &= ~ATA_FLAG_NOINTR;
3412 ata_qc_complete(qc);
3413 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3417 * ata_pio_poll - poll using PIO, depending on current state
3418 * @qc: qc in progress
3421 * None. (executing in kernel thread context)
3424 * timeout value to use
3426 static unsigned long ata_pio_poll(struct ata_queued_cmd *qc)
3428 struct ata_port *ap = qc->ap;
3430 unsigned int poll_state = HSM_ST_UNKNOWN;
3431 unsigned int reg_state = HSM_ST_UNKNOWN;
3433 switch (ap->hsm_task_state) {
3436 poll_state = HSM_ST_POLL;
3440 case HSM_ST_LAST_POLL:
3441 poll_state = HSM_ST_LAST_POLL;
3442 reg_state = HSM_ST_LAST;
3449 status = ata_chk_status(ap);
3450 if (status & ATA_BUSY) {
3451 if (time_after(jiffies, ap->pio_task_timeout)) {
3452 qc->err_mask |= AC_ERR_TIMEOUT;
3453 ap->hsm_task_state = HSM_ST_TMOUT;
3456 ap->hsm_task_state = poll_state;
3457 return ATA_SHORT_PAUSE;
3460 ap->hsm_task_state = reg_state;
3465 * ata_pio_complete - check if drive is busy or idle
3466 * @qc: qc to complete
3469 * None. (executing in kernel thread context)
3472 * Non-zero if qc completed, zero otherwise.
3474 static int ata_pio_complete(struct ata_queued_cmd *qc)
3476 struct ata_port *ap = qc->ap;
3480 * This is purely heuristic. This is a fast path. Sometimes when
3481 * we enter, BSY will be cleared in a chk-status or two. If not,
3482 * the drive is probably seeking or something. Snooze for a couple
3483 * msecs, then chk-status again. If still busy, fall back to
3484 * HSM_ST_POLL state.
3486 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3487 if (drv_stat & ATA_BUSY) {
3489 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3490 if (drv_stat & ATA_BUSY) {
3491 ap->hsm_task_state = HSM_ST_LAST_POLL;
3492 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3497 drv_stat = ata_wait_idle(ap);
3498 if (!ata_ok(drv_stat)) {
3499 qc->err_mask |= __ac_err_mask(drv_stat);
3500 ap->hsm_task_state = HSM_ST_ERR;
3504 ap->hsm_task_state = HSM_ST_IDLE;
3506 WARN_ON(qc->err_mask);
3507 ata_poll_qc_complete(qc);
3509 /* another command may start at this point */
3516 * swap_buf_le16 - swap halves of 16-bit words in place
3517 * @buf: Buffer to swap
3518 * @buf_words: Number of 16-bit words in buffer.
3520 * Swap halves of 16-bit words if needed to convert from
3521 * little-endian byte order to native cpu byte order, or
3525 * Inherited from caller.
3527 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3532 for (i = 0; i < buf_words; i++)
3533 buf[i] = le16_to_cpu(buf[i]);
3534 #endif /* __BIG_ENDIAN */
3538 * ata_mmio_data_xfer - Transfer data by MMIO
3539 * @ap: port to read/write
3541 * @buflen: buffer length
3542 * @write_data: read/write
3544 * Transfer data from/to the device data register by MMIO.
3547 * Inherited from caller.
3550 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3551 unsigned int buflen, int write_data)
3554 unsigned int words = buflen >> 1;
3555 u16 *buf16 = (u16 *) buf;
3556 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3558 /* Transfer multiple of 2 bytes */
3560 for (i = 0; i < words; i++)
3561 writew(le16_to_cpu(buf16[i]), mmio);
3563 for (i = 0; i < words; i++)
3564 buf16[i] = cpu_to_le16(readw(mmio));
3567 /* Transfer trailing 1 byte, if any. */
3568 if (unlikely(buflen & 0x01)) {
3569 u16 align_buf[1] = { 0 };
3570 unsigned char *trailing_buf = buf + buflen - 1;
3573 memcpy(align_buf, trailing_buf, 1);
3574 writew(le16_to_cpu(align_buf[0]), mmio);
3576 align_buf[0] = cpu_to_le16(readw(mmio));
3577 memcpy(trailing_buf, align_buf, 1);
3583 * ata_pio_data_xfer - Transfer data by PIO
3584 * @ap: port to read/write
3586 * @buflen: buffer length
3587 * @write_data: read/write
3589 * Transfer data from/to the device data register by PIO.
3592 * Inherited from caller.
3595 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3596 unsigned int buflen, int write_data)
3598 unsigned int words = buflen >> 1;
3600 /* Transfer multiple of 2 bytes */
3602 outsw(ap->ioaddr.data_addr, buf, words);
3604 insw(ap->ioaddr.data_addr, buf, words);
3606 /* Transfer trailing 1 byte, if any. */
3607 if (unlikely(buflen & 0x01)) {
3608 u16 align_buf[1] = { 0 };
3609 unsigned char *trailing_buf = buf + buflen - 1;
3612 memcpy(align_buf, trailing_buf, 1);
3613 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3615 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3616 memcpy(trailing_buf, align_buf, 1);
3622 * ata_data_xfer - Transfer data from/to the data register.
3623 * @ap: port to read/write
3625 * @buflen: buffer length
3626 * @do_write: read/write
3628 * Transfer data from/to the device data register.
3631 * Inherited from caller.
3634 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3635 unsigned int buflen, int do_write)
3637 /* Make the crap hardware pay the costs not the good stuff */
3638 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3639 unsigned long flags;
3640 local_irq_save(flags);
3641 if (ap->flags & ATA_FLAG_MMIO)
3642 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3644 ata_pio_data_xfer(ap, buf, buflen, do_write);
3645 local_irq_restore(flags);
3647 if (ap->flags & ATA_FLAG_MMIO)
3648 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3650 ata_pio_data_xfer(ap, buf, buflen, do_write);
3655 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3656 * @qc: Command on going
3658 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3661 * Inherited from caller.
3664 static void ata_pio_sector(struct ata_queued_cmd *qc)
3666 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3667 struct scatterlist *sg = qc->__sg;
3668 struct ata_port *ap = qc->ap;
3670 unsigned int offset;
3673 if (qc->cursect == (qc->nsect - 1))
3674 ap->hsm_task_state = HSM_ST_LAST;
3676 page = sg[qc->cursg].page;
3677 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3679 /* get the current page and offset */
3680 page = nth_page(page, (offset >> PAGE_SHIFT));
3681 offset %= PAGE_SIZE;
3683 buf = kmap(page) + offset;
3688 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3693 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3695 /* do the actual data transfer */
3696 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3697 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3703 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3704 * @qc: Command on going
3705 * @bytes: number of bytes
3707 * Transfer Transfer data from/to the ATAPI device.
3710 * Inherited from caller.
3714 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3716 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3717 struct scatterlist *sg = qc->__sg;
3718 struct ata_port *ap = qc->ap;
3721 unsigned int offset, count;
3723 if (qc->curbytes + bytes >= qc->nbytes)
3724 ap->hsm_task_state = HSM_ST_LAST;
3727 if (unlikely(qc->cursg >= qc->n_elem)) {
3729 * The end of qc->sg is reached and the device expects
3730 * more data to transfer. In order not to overrun qc->sg
3731 * and fulfill length specified in the byte count register,
3732 * - for read case, discard trailing data from the device
3733 * - for write case, padding zero data to the device
3735 u16 pad_buf[1] = { 0 };
3736 unsigned int words = bytes >> 1;
3739 if (words) /* warning if bytes > 1 */
3740 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3743 for (i = 0; i < words; i++)
3744 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3746 ap->hsm_task_state = HSM_ST_LAST;
3750 sg = &qc->__sg[qc->cursg];
3753 offset = sg->offset + qc->cursg_ofs;
3755 /* get the current page and offset */
3756 page = nth_page(page, (offset >> PAGE_SHIFT));
3757 offset %= PAGE_SIZE;
3759 /* don't overrun current sg */
3760 count = min(sg->length - qc->cursg_ofs, bytes);
3762 /* don't cross page boundaries */
3763 count = min(count, (unsigned int)PAGE_SIZE - offset);
3765 buf = kmap(page) + offset;
3768 qc->curbytes += count;
3769 qc->cursg_ofs += count;
3771 if (qc->cursg_ofs == sg->length) {
3776 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3778 /* do the actual data transfer */
3779 ata_data_xfer(ap, buf, count, do_write);
3788 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3789 * @qc: Command on going
3791 * Transfer Transfer data from/to the ATAPI device.
3794 * Inherited from caller.
3797 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3799 struct ata_port *ap = qc->ap;
3800 struct ata_device *dev = qc->dev;
3801 unsigned int ireason, bc_lo, bc_hi, bytes;
3802 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3804 ap->ops->tf_read(ap, &qc->tf);
3805 ireason = qc->tf.nsect;
3806 bc_lo = qc->tf.lbam;
3807 bc_hi = qc->tf.lbah;
3808 bytes = (bc_hi << 8) | bc_lo;
3810 /* shall be cleared to zero, indicating xfer of data */
3811 if (ireason & (1 << 0))
3814 /* make sure transfer direction matches expected */
3815 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3816 if (do_write != i_write)
3819 __atapi_pio_bytes(qc, bytes);
3824 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3825 ap->id, dev->devno);
3826 qc->err_mask |= AC_ERR_HSM;
3827 ap->hsm_task_state = HSM_ST_ERR;
3831 * ata_pio_block - start PIO on a block
3832 * @qc: qc to transfer block for
3835 * None. (executing in kernel thread context)
3837 static void ata_pio_block(struct ata_queued_cmd *qc)
3839 struct ata_port *ap = qc->ap;
3843 * This is purely heuristic. This is a fast path.
3844 * Sometimes when we enter, BSY will be cleared in
3845 * a chk-status or two. If not, the drive is probably seeking
3846 * or something. Snooze for a couple msecs, then
3847 * chk-status again. If still busy, fall back to
3848 * HSM_ST_POLL state.
3850 status = ata_busy_wait(ap, ATA_BUSY, 5);
3851 if (status & ATA_BUSY) {
3853 status = ata_busy_wait(ap, ATA_BUSY, 10);
3854 if (status & ATA_BUSY) {
3855 ap->hsm_task_state = HSM_ST_POLL;
3856 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3862 if (status & (ATA_ERR | ATA_DF)) {
3863 qc->err_mask |= AC_ERR_DEV;
3864 ap->hsm_task_state = HSM_ST_ERR;
3868 /* transfer data if any */
3869 if (is_atapi_taskfile(&qc->tf)) {
3870 /* DRQ=0 means no more data to transfer */
3871 if ((status & ATA_DRQ) == 0) {
3872 ap->hsm_task_state = HSM_ST_LAST;
3876 atapi_pio_bytes(qc);
3878 /* handle BSY=0, DRQ=0 as error */
3879 if ((status & ATA_DRQ) == 0) {
3880 qc->err_mask |= AC_ERR_HSM;
3881 ap->hsm_task_state = HSM_ST_ERR;
3889 static void ata_pio_error(struct ata_queued_cmd *qc)
3891 struct ata_port *ap = qc->ap;
3893 if (qc->tf.command != ATA_CMD_PACKET)
3894 printk(KERN_WARNING "ata%u: dev %u PIO error\n",
3895 ap->id, qc->dev->devno);
3897 /* make sure qc->err_mask is available to
3898 * know what's wrong and recover
3900 WARN_ON(qc->err_mask == 0);
3902 ap->hsm_task_state = HSM_ST_IDLE;
3904 ata_poll_qc_complete(qc);
3907 static void ata_pio_task(void *_data)
3909 struct ata_queued_cmd *qc = _data;
3910 struct ata_port *ap = qc->ap;
3911 unsigned long timeout;
3918 switch (ap->hsm_task_state) {
3927 qc_completed = ata_pio_complete(qc);
3931 case HSM_ST_LAST_POLL:
3932 timeout = ata_pio_poll(qc);
3942 ata_port_queue_task(ap, ata_pio_task, qc, timeout);
3943 else if (!qc_completed)
3948 * atapi_packet_task - Write CDB bytes to hardware
3949 * @_data: qc in progress
3951 * When device has indicated its readiness to accept
3952 * a CDB, this function is called. Send the CDB.
3953 * If DMA is to be performed, exit immediately.
3954 * Otherwise, we are in polling mode, so poll
3955 * status under operation succeeds or fails.
3958 * Kernel thread context (may sleep)
3960 static void atapi_packet_task(void *_data)
3962 struct ata_queued_cmd *qc = _data;
3963 struct ata_port *ap = qc->ap;
3966 /* sleep-wait for BSY to clear */
3967 DPRINTK("busy wait\n");
3968 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3969 qc->err_mask |= AC_ERR_TIMEOUT;
3973 /* make sure DRQ is set */
3974 status = ata_chk_status(ap);
3975 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3976 qc->err_mask |= AC_ERR_HSM;
3981 DPRINTK("send cdb\n");
3982 WARN_ON(qc->dev->cdb_len < 12);
3984 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3985 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3986 unsigned long flags;
3988 /* Once we're done issuing command and kicking bmdma,
3989 * irq handler takes over. To not lose irq, we need
3990 * to clear NOINTR flag before sending cdb, but
3991 * interrupt handler shouldn't be invoked before we're
3992 * finished. Hence, the following locking.
3994 spin_lock_irqsave(&ap->host_set->lock, flags);
3995 ap->flags &= ~ATA_FLAG_NOINTR;
3996 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3997 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3998 ap->ops->bmdma_start(qc); /* initiate bmdma */
3999 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4001 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4003 /* PIO commands are handled by polling */
4004 ap->hsm_task_state = HSM_ST;
4005 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4011 ata_poll_qc_complete(qc);
4015 * ata_qc_new - Request an available ATA command, for queueing
4016 * @ap: Port associated with device @dev
4017 * @dev: Device from whom we request an available command structure
4023 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4025 struct ata_queued_cmd *qc = NULL;
4028 for (i = 0; i < ATA_MAX_QUEUE; i++)
4029 if (!test_and_set_bit(i, &ap->qactive)) {
4030 qc = ata_qc_from_tag(ap, i);
4041 * ata_qc_new_init - Request an available ATA command, and initialize it
4042 * @ap: Port associated with device @dev
4043 * @dev: Device from whom we request an available command structure
4049 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
4050 struct ata_device *dev)
4052 struct ata_queued_cmd *qc;
4054 qc = ata_qc_new(ap);
4067 * ata_qc_free - free unused ata_queued_cmd
4068 * @qc: Command to complete
4070 * Designed to free unused ata_queued_cmd object
4071 * in case something prevents using it.
4074 * spin_lock_irqsave(host_set lock)
4076 void ata_qc_free(struct ata_queued_cmd *qc)
4078 struct ata_port *ap = qc->ap;
4081 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4085 if (likely(ata_tag_valid(tag))) {
4086 if (tag == ap->active_tag)
4087 ap->active_tag = ATA_TAG_POISON;
4088 qc->tag = ATA_TAG_POISON;
4089 clear_bit(tag, &ap->qactive);
4093 void __ata_qc_complete(struct ata_queued_cmd *qc)
4095 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4096 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4098 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4101 /* atapi: mark qc as inactive to prevent the interrupt handler
4102 * from completing the command twice later, before the error handler
4103 * is called. (when rc != 0 and atapi request sense is needed)
4105 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4107 /* call completion callback */
4108 qc->complete_fn(qc);
4111 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4113 struct ata_port *ap = qc->ap;
4115 switch (qc->tf.protocol) {
4117 case ATA_PROT_ATAPI_DMA:
4120 case ATA_PROT_ATAPI:
4122 if (ap->flags & ATA_FLAG_PIO_DMA)
4135 * ata_qc_issue - issue taskfile to device
4136 * @qc: command to issue to device
4138 * Prepare an ATA command to submission to device.
4139 * This includes mapping the data into a DMA-able
4140 * area, filling in the S/G table, and finally
4141 * writing the taskfile to hardware, starting the command.
4144 * spin_lock_irqsave(host_set lock)
4146 void ata_qc_issue(struct ata_queued_cmd *qc)
4148 struct ata_port *ap = qc->ap;
4150 qc->ap->active_tag = qc->tag;
4151 qc->flags |= ATA_QCFLAG_ACTIVE;
4153 if (ata_should_dma_map(qc)) {
4154 if (qc->flags & ATA_QCFLAG_SG) {
4155 if (ata_sg_setup(qc))
4157 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4158 if (ata_sg_setup_one(qc))
4162 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4165 ap->ops->qc_prep(qc);
4167 qc->err_mask |= ap->ops->qc_issue(qc);
4168 if (unlikely(qc->err_mask))
4173 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4174 qc->err_mask |= AC_ERR_SYSTEM;
4176 ata_qc_complete(qc);
4180 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4181 * @qc: command to issue to device
4183 * Using various libata functions and hooks, this function
4184 * starts an ATA command. ATA commands are grouped into
4185 * classes called "protocols", and issuing each type of protocol
4186 * is slightly different.
4188 * May be used as the qc_issue() entry in ata_port_operations.
4191 * spin_lock_irqsave(host_set lock)
4194 * Zero on success, AC_ERR_* mask on failure
4197 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4199 struct ata_port *ap = qc->ap;
4201 ata_dev_select(ap, qc->dev->devno, 1, 0);
4203 switch (qc->tf.protocol) {
4204 case ATA_PROT_NODATA:
4205 ata_tf_to_host(ap, &qc->tf);
4209 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4210 ap->ops->bmdma_setup(qc); /* set up bmdma */
4211 ap->ops->bmdma_start(qc); /* initiate bmdma */
4214 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4215 ata_qc_set_polling(qc);
4216 ata_tf_to_host(ap, &qc->tf);
4217 ap->hsm_task_state = HSM_ST;
4218 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4221 case ATA_PROT_ATAPI:
4222 ata_qc_set_polling(qc);
4223 ata_tf_to_host(ap, &qc->tf);
4224 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4227 case ATA_PROT_ATAPI_NODATA:
4228 ap->flags |= ATA_FLAG_NOINTR;
4229 ata_tf_to_host(ap, &qc->tf);
4230 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4233 case ATA_PROT_ATAPI_DMA:
4234 ap->flags |= ATA_FLAG_NOINTR;
4235 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4236 ap->ops->bmdma_setup(qc); /* set up bmdma */
4237 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4242 return AC_ERR_SYSTEM;
4249 * ata_host_intr - Handle host interrupt for given (port, task)
4250 * @ap: Port on which interrupt arrived (possibly...)
4251 * @qc: Taskfile currently active in engine
4253 * Handle host interrupt for given queued command. Currently,
4254 * only DMA interrupts are handled. All other commands are
4255 * handled via polling with interrupts disabled (nIEN bit).
4258 * spin_lock_irqsave(host_set lock)
4261 * One if interrupt was handled, zero if not (shared irq).
4264 inline unsigned int ata_host_intr (struct ata_port *ap,
4265 struct ata_queued_cmd *qc)
4267 u8 status, host_stat;
4269 switch (qc->tf.protocol) {
4272 case ATA_PROT_ATAPI_DMA:
4273 case ATA_PROT_ATAPI:
4274 /* check status of DMA engine */
4275 host_stat = ap->ops->bmdma_status(ap);
4276 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4278 /* if it's not our irq... */
4279 if (!(host_stat & ATA_DMA_INTR))
4282 /* before we do anything else, clear DMA-Start bit */
4283 ap->ops->bmdma_stop(qc);
4287 case ATA_PROT_ATAPI_NODATA:
4288 case ATA_PROT_NODATA:
4289 /* check altstatus */
4290 status = ata_altstatus(ap);
4291 if (status & ATA_BUSY)
4294 /* check main status, clearing INTRQ */
4295 status = ata_chk_status(ap);
4296 if (unlikely(status & ATA_BUSY))
4298 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4299 ap->id, qc->tf.protocol, status);
4301 /* ack bmdma irq events */
4302 ap->ops->irq_clear(ap);
4304 /* complete taskfile transaction */
4305 qc->err_mask |= ac_err_mask(status);
4306 ata_qc_complete(qc);
4313 return 1; /* irq handled */
4316 ap->stats.idle_irq++;
4319 if ((ap->stats.idle_irq % 1000) == 0) {
4320 ata_irq_ack(ap, 0); /* debug trap */
4321 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4325 return 0; /* irq not handled */
4329 * ata_interrupt - Default ATA host interrupt handler
4330 * @irq: irq line (unused)
4331 * @dev_instance: pointer to our ata_host_set information structure
4334 * Default interrupt handler for PCI IDE devices. Calls
4335 * ata_host_intr() for each port that is not disabled.
4338 * Obtains host_set lock during operation.
4341 * IRQ_NONE or IRQ_HANDLED.
4344 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4346 struct ata_host_set *host_set = dev_instance;
4348 unsigned int handled = 0;
4349 unsigned long flags;
4351 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4352 spin_lock_irqsave(&host_set->lock, flags);
4354 for (i = 0; i < host_set->n_ports; i++) {
4355 struct ata_port *ap;
4357 ap = host_set->ports[i];
4359 !(ap->flags & (ATA_FLAG_DISABLED | ATA_FLAG_NOINTR))) {
4360 struct ata_queued_cmd *qc;
4362 qc = ata_qc_from_tag(ap, ap->active_tag);
4363 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4364 (qc->flags & ATA_QCFLAG_ACTIVE))
4365 handled |= ata_host_intr(ap, qc);
4369 spin_unlock_irqrestore(&host_set->lock, flags);
4371 return IRQ_RETVAL(handled);
4376 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4377 * without filling any other registers
4379 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4382 struct ata_taskfile tf;
4385 ata_tf_init(ap, &tf, dev->devno);
4388 tf.flags |= ATA_TFLAG_DEVICE;
4389 tf.protocol = ATA_PROT_NODATA;
4391 err = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
4393 printk(KERN_ERR "%s: ata command failed: %d\n",
4399 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4403 if (!ata_try_flush_cache(dev))
4406 if (ata_id_has_flush_ext(dev->id))
4407 cmd = ATA_CMD_FLUSH_EXT;
4409 cmd = ATA_CMD_FLUSH;
4411 return ata_do_simple_cmd(ap, dev, cmd);
4414 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4416 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4419 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4421 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4425 * ata_device_resume - wakeup a previously suspended devices
4426 * @ap: port the device is connected to
4427 * @dev: the device to resume
4429 * Kick the drive back into action, by sending it an idle immediate
4430 * command and making sure its transfer mode matches between drive
4434 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4436 if (ap->flags & ATA_FLAG_SUSPENDED) {
4437 struct ata_device *failed_dev;
4438 ap->flags &= ~ATA_FLAG_SUSPENDED;
4439 while (ata_set_mode(ap, &failed_dev))
4440 ata_dev_disable(ap, failed_dev);
4442 if (!ata_dev_enabled(dev))
4444 if (dev->class == ATA_DEV_ATA)
4445 ata_start_drive(ap, dev);
4451 * ata_device_suspend - prepare a device for suspend
4452 * @ap: port the device is connected to
4453 * @dev: the device to suspend
4455 * Flush the cache on the drive, if appropriate, then issue a
4456 * standbynow command.
4458 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4460 if (!ata_dev_enabled(dev))
4462 if (dev->class == ATA_DEV_ATA)
4463 ata_flush_cache(ap, dev);
4465 if (state.event != PM_EVENT_FREEZE)
4466 ata_standby_drive(ap, dev);
4467 ap->flags |= ATA_FLAG_SUSPENDED;
4472 * ata_port_start - Set port up for dma.
4473 * @ap: Port to initialize
4475 * Called just after data structures for each port are
4476 * initialized. Allocates space for PRD table.
4478 * May be used as the port_start() entry in ata_port_operations.
4481 * Inherited from caller.
4484 int ata_port_start (struct ata_port *ap)
4486 struct device *dev = ap->dev;
4489 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4493 rc = ata_pad_alloc(ap, dev);
4495 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4499 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4506 * ata_port_stop - Undo ata_port_start()
4507 * @ap: Port to shut down
4509 * Frees the PRD table.
4511 * May be used as the port_stop() entry in ata_port_operations.
4514 * Inherited from caller.
4517 void ata_port_stop (struct ata_port *ap)
4519 struct device *dev = ap->dev;
4521 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4522 ata_pad_free(ap, dev);
4525 void ata_host_stop (struct ata_host_set *host_set)
4527 if (host_set->mmio_base)
4528 iounmap(host_set->mmio_base);
4533 * ata_host_remove - Unregister SCSI host structure with upper layers
4534 * @ap: Port to unregister
4535 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4538 * Inherited from caller.
4541 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4543 struct Scsi_Host *sh = ap->host;
4548 scsi_remove_host(sh);
4550 ap->ops->port_stop(ap);
4554 * ata_host_init - Initialize an ata_port structure
4555 * @ap: Structure to initialize
4556 * @host: associated SCSI mid-layer structure
4557 * @host_set: Collection of hosts to which @ap belongs
4558 * @ent: Probe information provided by low-level driver
4559 * @port_no: Port number associated with this ata_port
4561 * Initialize a new ata_port structure, and its associated
4565 * Inherited from caller.
4568 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4569 struct ata_host_set *host_set,
4570 const struct ata_probe_ent *ent, unsigned int port_no)
4576 host->max_channel = 1;
4577 host->unique_id = ata_unique_id++;
4578 host->max_cmd_len = 12;
4580 ap->flags = ATA_FLAG_DISABLED;
4581 ap->id = host->unique_id;
4583 ap->ctl = ATA_DEVCTL_OBS;
4584 ap->host_set = host_set;
4586 ap->port_no = port_no;
4588 ent->legacy_mode ? ent->hard_port_no : port_no;
4589 ap->pio_mask = ent->pio_mask;
4590 ap->mwdma_mask = ent->mwdma_mask;
4591 ap->udma_mask = ent->udma_mask;
4592 ap->flags |= ent->host_flags;
4593 ap->ops = ent->port_ops;
4594 ap->cbl = ATA_CBL_NONE;
4595 ap->sata_spd_limit = UINT_MAX;
4596 ap->active_tag = ATA_TAG_POISON;
4597 ap->last_ctl = 0xFF;
4599 INIT_WORK(&ap->port_task, NULL, NULL);
4600 INIT_LIST_HEAD(&ap->eh_done_q);
4602 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4603 struct ata_device *dev = &ap->device[i];
4605 dev->pio_mask = UINT_MAX;
4606 dev->mwdma_mask = UINT_MAX;
4607 dev->udma_mask = UINT_MAX;
4611 ap->stats.unhandled_irq = 1;
4612 ap->stats.idle_irq = 1;
4615 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4619 * ata_host_add - Attach low-level ATA driver to system
4620 * @ent: Information provided by low-level driver
4621 * @host_set: Collections of ports to which we add
4622 * @port_no: Port number associated with this host
4624 * Attach low-level ATA driver to system.
4627 * PCI/etc. bus probe sem.
4630 * New ata_port on success, for NULL on error.
4633 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4634 struct ata_host_set *host_set,
4635 unsigned int port_no)
4637 struct Scsi_Host *host;
4638 struct ata_port *ap;
4643 if (!ent->port_ops->probe_reset &&
4644 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4645 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4650 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4654 host->transportt = &ata_scsi_transport_template;
4656 ap = ata_shost_to_port(host);
4658 ata_host_init(ap, host, host_set, ent, port_no);
4660 rc = ap->ops->port_start(ap);
4667 scsi_host_put(host);
4672 * ata_device_add - Register hardware device with ATA and SCSI layers
4673 * @ent: Probe information describing hardware device to be registered
4675 * This function processes the information provided in the probe
4676 * information struct @ent, allocates the necessary ATA and SCSI
4677 * host information structures, initializes them, and registers
4678 * everything with requisite kernel subsystems.
4680 * This function requests irqs, probes the ATA bus, and probes
4684 * PCI/etc. bus probe sem.
4687 * Number of ports registered. Zero on error (no ports registered).
4690 int ata_device_add(const struct ata_probe_ent *ent)
4692 unsigned int count = 0, i;
4693 struct device *dev = ent->dev;
4694 struct ata_host_set *host_set;
4697 /* alloc a container for our list of ATA ports (buses) */
4698 host_set = kzalloc(sizeof(struct ata_host_set) +
4699 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4702 spin_lock_init(&host_set->lock);
4704 host_set->dev = dev;
4705 host_set->n_ports = ent->n_ports;
4706 host_set->irq = ent->irq;
4707 host_set->mmio_base = ent->mmio_base;
4708 host_set->private_data = ent->private_data;
4709 host_set->ops = ent->port_ops;
4710 host_set->flags = ent->host_set_flags;
4712 /* register each port bound to this device */
4713 for (i = 0; i < ent->n_ports; i++) {
4714 struct ata_port *ap;
4715 unsigned long xfer_mode_mask;
4717 ap = ata_host_add(ent, host_set, i);
4721 host_set->ports[i] = ap;
4722 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4723 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4724 (ap->pio_mask << ATA_SHIFT_PIO);
4726 /* print per-port info to dmesg */
4727 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4728 "bmdma 0x%lX irq %lu\n",
4730 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4731 ata_mode_string(xfer_mode_mask),
4732 ap->ioaddr.cmd_addr,
4733 ap->ioaddr.ctl_addr,
4734 ap->ioaddr.bmdma_addr,
4738 host_set->ops->irq_clear(ap);
4745 /* obtain irq, that is shared between channels */
4746 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4747 DRV_NAME, host_set))
4750 /* perform each probe synchronously */
4751 DPRINTK("probe begin\n");
4752 for (i = 0; i < count; i++) {
4753 struct ata_port *ap;
4756 ap = host_set->ports[i];
4758 DPRINTK("ata%u: bus probe begin\n", ap->id);
4759 rc = ata_bus_probe(ap);
4760 DPRINTK("ata%u: bus probe end\n", ap->id);
4763 /* FIXME: do something useful here?
4764 * Current libata behavior will
4765 * tear down everything when
4766 * the module is removed
4767 * or the h/w is unplugged.
4771 rc = scsi_add_host(ap->host, dev);
4773 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4775 /* FIXME: do something useful here */
4776 /* FIXME: handle unconditional calls to
4777 * scsi_scan_host and ata_host_remove, below,
4783 /* probes are done, now scan each port's disk(s) */
4784 DPRINTK("host probe begin\n");
4785 for (i = 0; i < count; i++) {
4786 struct ata_port *ap = host_set->ports[i];
4788 ata_scsi_scan_host(ap);
4791 dev_set_drvdata(dev, host_set);
4793 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4794 return ent->n_ports; /* success */
4797 for (i = 0; i < count; i++) {
4798 ata_host_remove(host_set->ports[i], 1);
4799 scsi_host_put(host_set->ports[i]->host);
4803 VPRINTK("EXIT, returning 0\n");
4808 * ata_host_set_remove - PCI layer callback for device removal
4809 * @host_set: ATA host set that was removed
4811 * Unregister all objects associated with this host set. Free those
4815 * Inherited from calling layer (may sleep).
4818 void ata_host_set_remove(struct ata_host_set *host_set)
4820 struct ata_port *ap;
4823 for (i = 0; i < host_set->n_ports; i++) {
4824 ap = host_set->ports[i];
4825 scsi_remove_host(ap->host);
4828 free_irq(host_set->irq, host_set);
4830 for (i = 0; i < host_set->n_ports; i++) {
4831 ap = host_set->ports[i];
4833 ata_scsi_release(ap->host);
4835 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4836 struct ata_ioports *ioaddr = &ap->ioaddr;
4838 if (ioaddr->cmd_addr == 0x1f0)
4839 release_region(0x1f0, 8);
4840 else if (ioaddr->cmd_addr == 0x170)
4841 release_region(0x170, 8);
4844 scsi_host_put(ap->host);
4847 if (host_set->ops->host_stop)
4848 host_set->ops->host_stop(host_set);
4854 * ata_scsi_release - SCSI layer callback hook for host unload
4855 * @host: libata host to be unloaded
4857 * Performs all duties necessary to shut down a libata port...
4858 * Kill port kthread, disable port, and release resources.
4861 * Inherited from SCSI layer.
4867 int ata_scsi_release(struct Scsi_Host *host)
4869 struct ata_port *ap = ata_shost_to_port(host);
4874 ap->ops->port_disable(ap);
4875 ata_host_remove(ap, 0);
4876 for (i = 0; i < ATA_MAX_DEVICES; i++)
4877 kfree(ap->device[i].id);
4884 * ata_std_ports - initialize ioaddr with standard port offsets.
4885 * @ioaddr: IO address structure to be initialized
4887 * Utility function which initializes data_addr, error_addr,
4888 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4889 * device_addr, status_addr, and command_addr to standard offsets
4890 * relative to cmd_addr.
4892 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4895 void ata_std_ports(struct ata_ioports *ioaddr)
4897 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4898 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4899 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4900 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4901 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4902 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4903 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4904 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4905 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4906 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4912 void ata_pci_host_stop (struct ata_host_set *host_set)
4914 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4916 pci_iounmap(pdev, host_set->mmio_base);
4920 * ata_pci_remove_one - PCI layer callback for device removal
4921 * @pdev: PCI device that was removed
4923 * PCI layer indicates to libata via this hook that
4924 * hot-unplug or module unload event has occurred.
4925 * Handle this by unregistering all objects associated
4926 * with this PCI device. Free those objects. Then finally
4927 * release PCI resources and disable device.
4930 * Inherited from PCI layer (may sleep).
4933 void ata_pci_remove_one (struct pci_dev *pdev)
4935 struct device *dev = pci_dev_to_dev(pdev);
4936 struct ata_host_set *host_set = dev_get_drvdata(dev);
4938 ata_host_set_remove(host_set);
4939 pci_release_regions(pdev);
4940 pci_disable_device(pdev);
4941 dev_set_drvdata(dev, NULL);
4944 /* move to PCI subsystem */
4945 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4947 unsigned long tmp = 0;
4949 switch (bits->width) {
4952 pci_read_config_byte(pdev, bits->reg, &tmp8);
4958 pci_read_config_word(pdev, bits->reg, &tmp16);
4964 pci_read_config_dword(pdev, bits->reg, &tmp32);
4975 return (tmp == bits->val) ? 1 : 0;
4978 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4980 pci_save_state(pdev);
4981 pci_disable_device(pdev);
4982 pci_set_power_state(pdev, PCI_D3hot);
4986 int ata_pci_device_resume(struct pci_dev *pdev)
4988 pci_set_power_state(pdev, PCI_D0);
4989 pci_restore_state(pdev);
4990 pci_enable_device(pdev);
4991 pci_set_master(pdev);
4994 #endif /* CONFIG_PCI */
4997 static int __init ata_init(void)
4999 ata_wq = create_workqueue("ata");
5003 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5007 static void __exit ata_exit(void)
5009 destroy_workqueue(ata_wq);
5012 module_init(ata_init);
5013 module_exit(ata_exit);
5015 static unsigned long ratelimit_time;
5016 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5018 int ata_ratelimit(void)
5021 unsigned long flags;
5023 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5025 if (time_after(jiffies, ratelimit_time)) {
5027 ratelimit_time = jiffies + (HZ/5);
5031 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5037 * ata_wait_register - wait until register value changes
5038 * @reg: IO-mapped register
5039 * @mask: Mask to apply to read register value
5040 * @val: Wait condition
5041 * @interval_msec: polling interval in milliseconds
5042 * @timeout_msec: timeout in milliseconds
5044 * Waiting for some bits of register to change is a common
5045 * operation for ATA controllers. This function reads 32bit LE
5046 * IO-mapped register @reg and tests for the following condition.
5048 * (*@reg & mask) != val
5050 * If the condition is met, it returns; otherwise, the process is
5051 * repeated after @interval_msec until timeout.
5054 * Kernel thread context (may sleep)
5057 * The final register value.
5059 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5060 unsigned long interval_msec,
5061 unsigned long timeout_msec)
5063 unsigned long timeout;
5066 tmp = ioread32(reg);
5068 /* Calculate timeout _after_ the first read to make sure
5069 * preceding writes reach the controller before starting to
5070 * eat away the timeout.
5072 timeout = jiffies + (timeout_msec * HZ) / 1000;
5074 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5075 msleep(interval_msec);
5076 tmp = ioread32(reg);
5083 * libata is essentially a library of internal helper functions for
5084 * low-level ATA host controller drivers. As such, the API/ABI is
5085 * likely to change as new drivers are added and updated.
5086 * Do not depend on ABI/API stability.
5089 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5090 EXPORT_SYMBOL_GPL(ata_std_ports);
5091 EXPORT_SYMBOL_GPL(ata_device_add);
5092 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5093 EXPORT_SYMBOL_GPL(ata_sg_init);
5094 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5095 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5096 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5097 EXPORT_SYMBOL_GPL(ata_tf_load);
5098 EXPORT_SYMBOL_GPL(ata_tf_read);
5099 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5100 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5101 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5102 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5103 EXPORT_SYMBOL_GPL(ata_check_status);
5104 EXPORT_SYMBOL_GPL(ata_altstatus);
5105 EXPORT_SYMBOL_GPL(ata_exec_command);
5106 EXPORT_SYMBOL_GPL(ata_port_start);
5107 EXPORT_SYMBOL_GPL(ata_port_stop);
5108 EXPORT_SYMBOL_GPL(ata_host_stop);
5109 EXPORT_SYMBOL_GPL(ata_interrupt);
5110 EXPORT_SYMBOL_GPL(ata_qc_prep);
5111 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5112 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5113 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5114 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5115 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5116 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5117 EXPORT_SYMBOL_GPL(ata_port_probe);
5118 EXPORT_SYMBOL_GPL(sata_set_spd);
5119 EXPORT_SYMBOL_GPL(sata_phy_reset);
5120 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5121 EXPORT_SYMBOL_GPL(ata_bus_reset);
5122 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5123 EXPORT_SYMBOL_GPL(ata_std_softreset);
5124 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5125 EXPORT_SYMBOL_GPL(ata_std_postreset);
5126 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5127 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5128 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5129 EXPORT_SYMBOL_GPL(ata_dev_classify);
5130 EXPORT_SYMBOL_GPL(ata_dev_pair);
5131 EXPORT_SYMBOL_GPL(ata_port_disable);
5132 EXPORT_SYMBOL_GPL(ata_ratelimit);
5133 EXPORT_SYMBOL_GPL(ata_wait_register);
5134 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5135 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5136 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5137 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5138 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5139 EXPORT_SYMBOL_GPL(ata_scsi_release);
5140 EXPORT_SYMBOL_GPL(ata_host_intr);
5141 EXPORT_SYMBOL_GPL(ata_id_string);
5142 EXPORT_SYMBOL_GPL(ata_id_c_string);
5143 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5145 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5146 EXPORT_SYMBOL_GPL(ata_timing_compute);
5147 EXPORT_SYMBOL_GPL(ata_timing_merge);
5150 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5151 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5152 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5153 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5154 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5155 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5156 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5157 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5158 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5159 #endif /* CONFIG_PCI */
5161 EXPORT_SYMBOL_GPL(ata_device_suspend);
5162 EXPORT_SYMBOL_GPL(ata_device_resume);
5163 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5164 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5166 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5167 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5168 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);