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;
962 * ata_exec_internal - execute libata internal command
963 * @ap: Port to which the command is sent
964 * @dev: Device to which the command is sent
965 * @tf: Taskfile registers for the command and the result
966 * @cdb: CDB for packet command
967 * @dma_dir: Data tranfer direction of the command
968 * @buf: Data buffer of the command
969 * @buflen: Length of data buffer
971 * Executes libata internal command with timeout. @tf contains
972 * command on entry and result on return. Timeout and error
973 * conditions are reported via return value. No recovery action
974 * is taken after a command times out. It's caller's duty to
975 * clean up after timeout.
978 * None. Should be called with kernel context, might sleep.
981 unsigned ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
982 struct ata_taskfile *tf, const u8 *cdb,
983 int dma_dir, void *buf, unsigned int buflen)
985 u8 command = tf->command;
986 struct ata_queued_cmd *qc;
987 DECLARE_COMPLETION(wait);
989 unsigned int err_mask;
991 spin_lock_irqsave(&ap->host_set->lock, flags);
993 qc = ata_qc_new_init(ap, dev);
998 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
999 qc->flags |= ATA_QCFLAG_RESULT_TF;
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 spin_lock_irqsave(&ap->host_set->lock, flags);
1037 *tf = qc->result_tf;
1038 err_mask = qc->err_mask;
1042 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1043 * Until those drivers are fixed, we detect the condition
1044 * here, fail the command with AC_ERR_SYSTEM and reenable the
1047 * Note that this doesn't change any behavior as internal
1048 * command failure results in disabling the device in the
1049 * higher layer for LLDDs without new reset/EH callbacks.
1051 * Kill the following code as soon as those drivers are fixed.
1053 if (ap->flags & ATA_FLAG_DISABLED) {
1054 err_mask |= AC_ERR_SYSTEM;
1058 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1064 * ata_pio_need_iordy - check if iordy needed
1067 * Check if the current speed of the device requires IORDY. Used
1068 * by various controllers for chip configuration.
1071 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1074 int speed = adev->pio_mode - XFER_PIO_0;
1081 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1083 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1084 pio = adev->id[ATA_ID_EIDE_PIO];
1085 /* Is the speed faster than the drive allows non IORDY ? */
1087 /* This is cycle times not frequency - watch the logic! */
1088 if (pio > 240) /* PIO2 is 240nS per cycle */
1097 * ata_dev_read_id - Read ID data from the specified device
1098 * @ap: port on which target device resides
1099 * @dev: target device
1100 * @p_class: pointer to class of the target device (may be changed)
1101 * @post_reset: is this read ID post-reset?
1102 * @id: buffer to read IDENTIFY data into
1104 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1105 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1106 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1107 * for pre-ATA4 drives.
1110 * Kernel thread context (may sleep)
1113 * 0 on success, -errno otherwise.
1115 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1116 unsigned int *p_class, int post_reset, u16 *id)
1118 unsigned int class = *p_class;
1119 struct ata_taskfile tf;
1120 unsigned int err_mask = 0;
1124 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1126 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1129 ata_tf_init(ap, &tf, dev->devno);
1133 tf.command = ATA_CMD_ID_ATA;
1136 tf.command = ATA_CMD_ID_ATAPI;
1140 reason = "unsupported class";
1144 tf.protocol = ATA_PROT_PIO;
1146 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_FROM_DEVICE,
1147 id, sizeof(id[0]) * ATA_ID_WORDS);
1150 reason = "I/O error";
1154 swap_buf_le16(id, ATA_ID_WORDS);
1157 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1159 reason = "device reports illegal type";
1163 if (post_reset && class == ATA_DEV_ATA) {
1165 * The exact sequence expected by certain pre-ATA4 drives is:
1168 * INITIALIZE DEVICE PARAMETERS
1170 * Some drives were very specific about that exact sequence.
1172 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1173 err_mask = ata_dev_init_params(ap, dev, id[3], id[6]);
1176 reason = "INIT_DEV_PARAMS failed";
1180 /* current CHS translation info (id[53-58]) might be
1181 * changed. reread the identify device info.
1193 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1194 ap->id, dev->devno, reason);
1198 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1199 struct ata_device *dev)
1201 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1205 * ata_dev_configure - Configure the specified ATA/ATAPI device
1206 * @ap: Port on which target device resides
1207 * @dev: Target device to configure
1208 * @print_info: Enable device info printout
1210 * Configure @dev according to @dev->id. Generic and low-level
1211 * driver specific fixups are also applied.
1214 * Kernel thread context (may sleep)
1217 * 0 on success, -errno otherwise
1219 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1222 const u16 *id = dev->id;
1223 unsigned int xfer_mask;
1226 if (!ata_dev_enabled(dev)) {
1227 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1228 ap->id, dev->devno);
1232 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1234 /* print device capabilities */
1236 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1237 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1238 ap->id, dev->devno, id[49], id[82], id[83],
1239 id[84], id[85], id[86], id[87], id[88]);
1241 /* initialize to-be-configured parameters */
1242 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1243 dev->max_sectors = 0;
1251 * common ATA, ATAPI feature tests
1254 /* find max transfer mode; for printk only */
1255 xfer_mask = ata_id_xfermask(id);
1259 /* ATA-specific feature tests */
1260 if (dev->class == ATA_DEV_ATA) {
1261 dev->n_sectors = ata_id_n_sectors(id);
1263 if (ata_id_has_lba(id)) {
1264 const char *lba_desc;
1267 dev->flags |= ATA_DFLAG_LBA;
1268 if (ata_id_has_lba48(id)) {
1269 dev->flags |= ATA_DFLAG_LBA48;
1273 /* print device info to dmesg */
1275 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1276 "max %s, %Lu sectors: %s\n",
1278 ata_id_major_version(id),
1279 ata_mode_string(xfer_mask),
1280 (unsigned long long)dev->n_sectors,
1285 /* Default translation */
1286 dev->cylinders = id[1];
1288 dev->sectors = id[6];
1290 if (ata_id_current_chs_valid(id)) {
1291 /* Current CHS translation is valid. */
1292 dev->cylinders = id[54];
1293 dev->heads = id[55];
1294 dev->sectors = id[56];
1297 /* print device info to dmesg */
1299 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1300 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1302 ata_id_major_version(id),
1303 ata_mode_string(xfer_mask),
1304 (unsigned long long)dev->n_sectors,
1305 dev->cylinders, dev->heads, dev->sectors);
1311 /* ATAPI-specific feature tests */
1312 else if (dev->class == ATA_DEV_ATAPI) {
1313 rc = atapi_cdb_len(id);
1314 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1315 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1319 dev->cdb_len = (unsigned int) rc;
1321 /* print device info to dmesg */
1323 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1324 ap->id, dev->devno, ata_mode_string(xfer_mask));
1327 ap->host->max_cmd_len = 0;
1328 for (i = 0; i < ATA_MAX_DEVICES; i++)
1329 ap->host->max_cmd_len = max_t(unsigned int,
1330 ap->host->max_cmd_len,
1331 ap->device[i].cdb_len);
1333 /* limit bridge transfers to udma5, 200 sectors */
1334 if (ata_dev_knobble(ap, dev)) {
1336 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1337 ap->id, dev->devno);
1338 dev->udma_mask &= ATA_UDMA5;
1339 dev->max_sectors = ATA_MAX_SECTORS;
1342 if (ap->ops->dev_config)
1343 ap->ops->dev_config(ap, dev);
1345 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1349 DPRINTK("EXIT, err\n");
1354 * ata_bus_probe - Reset and probe ATA bus
1357 * Master ATA bus probing function. Initiates a hardware-dependent
1358 * bus reset, then attempts to identify any devices found on
1362 * PCI/etc. bus probe sem.
1365 * Zero on success, negative errno otherwise.
1368 static int ata_bus_probe(struct ata_port *ap)
1370 unsigned int classes[ATA_MAX_DEVICES];
1371 int tries[ATA_MAX_DEVICES];
1372 int i, rc, down_xfermask;
1373 struct ata_device *dev;
1377 for (i = 0; i < ATA_MAX_DEVICES; i++)
1378 tries[i] = ATA_PROBE_MAX_TRIES;
1383 /* reset and determine device classes */
1384 for (i = 0; i < ATA_MAX_DEVICES; i++)
1385 classes[i] = ATA_DEV_UNKNOWN;
1387 if (ap->ops->probe_reset) {
1388 rc = ap->ops->probe_reset(ap, classes);
1390 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1394 ap->ops->phy_reset(ap);
1396 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1397 if (!(ap->flags & ATA_FLAG_DISABLED))
1398 classes[i] = ap->device[i].class;
1399 ap->device[i].class = ATA_DEV_UNKNOWN;
1405 for (i = 0; i < ATA_MAX_DEVICES; i++)
1406 if (classes[i] == ATA_DEV_UNKNOWN)
1407 classes[i] = ATA_DEV_NONE;
1409 /* read IDENTIFY page and configure devices */
1410 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1411 dev = &ap->device[i];
1414 dev->class = classes[i];
1416 if (!ata_dev_enabled(dev))
1419 rc = ata_dev_read_id(ap, dev, &dev->class, 1, dev->id);
1423 rc = ata_dev_configure(ap, dev, 1);
1428 /* configure transfer mode */
1429 rc = ata_set_mode(ap, &dev);
1435 for (i = 0; i < ATA_MAX_DEVICES; i++)
1436 if (ata_dev_enabled(&ap->device[i]))
1439 /* no device present, disable port */
1440 ata_port_disable(ap);
1441 ap->ops->port_disable(ap);
1448 tries[dev->devno] = 0;
1451 sata_down_spd_limit(ap);
1454 tries[dev->devno]--;
1455 if (down_xfermask &&
1456 ata_down_xfermask_limit(ap, dev, tries[dev->devno] == 1))
1457 tries[dev->devno] = 0;
1460 if (!tries[dev->devno]) {
1461 ata_down_xfermask_limit(ap, dev, 1);
1462 ata_dev_disable(ap, dev);
1469 * ata_port_probe - Mark port as enabled
1470 * @ap: Port for which we indicate enablement
1472 * Modify @ap data structure such that the system
1473 * thinks that the entire port is enabled.
1475 * LOCKING: host_set lock, or some other form of
1479 void ata_port_probe(struct ata_port *ap)
1481 ap->flags &= ~ATA_FLAG_DISABLED;
1485 * sata_print_link_status - Print SATA link status
1486 * @ap: SATA port to printk link status about
1488 * This function prints link speed and status of a SATA link.
1493 static void sata_print_link_status(struct ata_port *ap)
1495 u32 sstatus, scontrol, tmp;
1497 if (!ap->ops->scr_read)
1500 sstatus = scr_read(ap, SCR_STATUS);
1501 scontrol = scr_read(ap, SCR_CONTROL);
1503 if (sata_dev_present(ap)) {
1504 tmp = (sstatus >> 4) & 0xf;
1506 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1507 ap->id, sata_spd_string(tmp), sstatus, scontrol);
1510 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1511 ap->id, sstatus, scontrol);
1516 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1517 * @ap: SATA port associated with target SATA PHY.
1519 * This function issues commands to standard SATA Sxxx
1520 * PHY registers, to wake up the phy (and device), and
1521 * clear any reset condition.
1524 * PCI/etc. bus probe sem.
1527 void __sata_phy_reset(struct ata_port *ap)
1530 unsigned long timeout = jiffies + (HZ * 5);
1532 if (ap->flags & ATA_FLAG_SATA_RESET) {
1533 /* issue phy wake/reset */
1534 scr_write_flush(ap, SCR_CONTROL, 0x301);
1535 /* Couldn't find anything in SATA I/II specs, but
1536 * AHCI-1.1 10.4.2 says at least 1 ms. */
1539 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1541 /* wait for phy to become ready, if necessary */
1544 sstatus = scr_read(ap, SCR_STATUS);
1545 if ((sstatus & 0xf) != 1)
1547 } while (time_before(jiffies, timeout));
1549 /* print link status */
1550 sata_print_link_status(ap);
1552 /* TODO: phy layer with polling, timeouts, etc. */
1553 if (sata_dev_present(ap))
1556 ata_port_disable(ap);
1558 if (ap->flags & ATA_FLAG_DISABLED)
1561 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1562 ata_port_disable(ap);
1566 ap->cbl = ATA_CBL_SATA;
1570 * sata_phy_reset - Reset SATA bus.
1571 * @ap: SATA port associated with target SATA PHY.
1573 * This function resets the SATA bus, and then probes
1574 * the bus for devices.
1577 * PCI/etc. bus probe sem.
1580 void sata_phy_reset(struct ata_port *ap)
1582 __sata_phy_reset(ap);
1583 if (ap->flags & ATA_FLAG_DISABLED)
1589 * ata_dev_pair - return other device on cable
1593 * Obtain the other device on the same cable, or if none is
1594 * present NULL is returned
1597 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1599 struct ata_device *pair = &ap->device[1 - adev->devno];
1600 if (!ata_dev_enabled(pair))
1606 * ata_port_disable - Disable port.
1607 * @ap: Port to be disabled.
1609 * Modify @ap data structure such that the system
1610 * thinks that the entire port is disabled, and should
1611 * never attempt to probe or communicate with devices
1614 * LOCKING: host_set lock, or some other form of
1618 void ata_port_disable(struct ata_port *ap)
1620 ap->device[0].class = ATA_DEV_NONE;
1621 ap->device[1].class = ATA_DEV_NONE;
1622 ap->flags |= ATA_FLAG_DISABLED;
1626 * sata_down_spd_limit - adjust SATA spd limit downward
1627 * @ap: Port to adjust SATA spd limit for
1629 * Adjust SATA spd limit of @ap downward. Note that this
1630 * function only adjusts the limit. The change must be applied
1631 * using sata_set_spd().
1634 * Inherited from caller.
1637 * 0 on success, negative errno on failure
1639 int sata_down_spd_limit(struct ata_port *ap)
1644 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1647 mask = ap->sata_spd_limit;
1650 highbit = fls(mask) - 1;
1651 mask &= ~(1 << highbit);
1653 spd = (scr_read(ap, SCR_STATUS) >> 4) & 0xf;
1657 mask &= (1 << spd) - 1;
1661 ap->sata_spd_limit = mask;
1663 printk(KERN_WARNING "ata%u: limiting SATA link speed to %s\n",
1664 ap->id, sata_spd_string(fls(mask)));
1669 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1673 if (ap->sata_spd_limit == UINT_MAX)
1676 limit = fls(ap->sata_spd_limit);
1678 spd = (*scontrol >> 4) & 0xf;
1679 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1681 return spd != limit;
1685 * sata_set_spd_needed - is SATA spd configuration needed
1686 * @ap: Port in question
1688 * Test whether the spd limit in SControl matches
1689 * @ap->sata_spd_limit. This function is used to determine
1690 * whether hardreset is necessary to apply SATA spd
1694 * Inherited from caller.
1697 * 1 if SATA spd configuration is needed, 0 otherwise.
1699 int sata_set_spd_needed(struct ata_port *ap)
1703 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1706 scontrol = scr_read(ap, SCR_CONTROL);
1708 return __sata_set_spd_needed(ap, &scontrol);
1712 * sata_set_spd - set SATA spd according to spd limit
1713 * @ap: Port to set SATA spd for
1715 * Set SATA spd of @ap according to sata_spd_limit.
1718 * Inherited from caller.
1721 * 0 if spd doesn't need to be changed, 1 if spd has been
1722 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1724 int sata_set_spd(struct ata_port *ap)
1728 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1731 scontrol = scr_read(ap, SCR_CONTROL);
1732 if (!__sata_set_spd_needed(ap, &scontrol))
1735 scr_write(ap, SCR_CONTROL, scontrol);
1740 * This mode timing computation functionality is ported over from
1741 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1744 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1745 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1746 * for PIO 5, which is a nonstandard extension and UDMA6, which
1747 * is currently supported only by Maxtor drives.
1750 static const struct ata_timing ata_timing[] = {
1752 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1753 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1754 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1755 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1757 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1758 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1759 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1761 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1763 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1764 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1765 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1767 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1768 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1769 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1771 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1772 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1773 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1775 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1776 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1777 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1779 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1784 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1785 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1787 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1789 q->setup = EZ(t->setup * 1000, T);
1790 q->act8b = EZ(t->act8b * 1000, T);
1791 q->rec8b = EZ(t->rec8b * 1000, T);
1792 q->cyc8b = EZ(t->cyc8b * 1000, T);
1793 q->active = EZ(t->active * 1000, T);
1794 q->recover = EZ(t->recover * 1000, T);
1795 q->cycle = EZ(t->cycle * 1000, T);
1796 q->udma = EZ(t->udma * 1000, UT);
1799 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1800 struct ata_timing *m, unsigned int what)
1802 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1803 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1804 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1805 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1806 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1807 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1808 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1809 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1812 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1814 const struct ata_timing *t;
1816 for (t = ata_timing; t->mode != speed; t++)
1817 if (t->mode == 0xFF)
1822 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1823 struct ata_timing *t, int T, int UT)
1825 const struct ata_timing *s;
1826 struct ata_timing p;
1832 if (!(s = ata_timing_find_mode(speed)))
1835 memcpy(t, s, sizeof(*s));
1838 * If the drive is an EIDE drive, it can tell us it needs extended
1839 * PIO/MW_DMA cycle timing.
1842 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1843 memset(&p, 0, sizeof(p));
1844 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1845 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1846 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1847 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1848 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1850 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1854 * Convert the timing to bus clock counts.
1857 ata_timing_quantize(t, t, T, UT);
1860 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1861 * S.M.A.R.T * and some other commands. We have to ensure that the
1862 * DMA cycle timing is slower/equal than the fastest PIO timing.
1865 if (speed > XFER_PIO_4) {
1866 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1867 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1871 * Lengthen active & recovery time so that cycle time is correct.
1874 if (t->act8b + t->rec8b < t->cyc8b) {
1875 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1876 t->rec8b = t->cyc8b - t->act8b;
1879 if (t->active + t->recover < t->cycle) {
1880 t->active += (t->cycle - (t->active + t->recover)) / 2;
1881 t->recover = t->cycle - t->active;
1888 * ata_down_xfermask_limit - adjust dev xfer masks downward
1889 * @ap: Port associated with device @dev
1890 * @dev: Device to adjust xfer masks
1891 * @force_pio0: Force PIO0
1893 * Adjust xfer masks of @dev downward. Note that this function
1894 * does not apply the change. Invoking ata_set_mode() afterwards
1895 * will apply the limit.
1898 * Inherited from caller.
1901 * 0 on success, negative errno on failure
1903 int ata_down_xfermask_limit(struct ata_port *ap, struct ata_device *dev,
1906 unsigned long xfer_mask;
1909 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1914 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1915 if (xfer_mask & ATA_MASK_UDMA)
1916 xfer_mask &= ~ATA_MASK_MWDMA;
1918 highbit = fls(xfer_mask) - 1;
1919 xfer_mask &= ~(1 << highbit);
1921 xfer_mask &= 1 << ATA_SHIFT_PIO;
1925 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1928 printk(KERN_WARNING "ata%u: dev %u limiting speed to %s\n",
1929 ap->id, dev->devno, ata_mode_string(xfer_mask));
1937 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1939 unsigned int err_mask;
1942 dev->flags &= ~ATA_DFLAG_PIO;
1943 if (dev->xfer_shift == ATA_SHIFT_PIO)
1944 dev->flags |= ATA_DFLAG_PIO;
1946 err_mask = ata_dev_set_xfermode(ap, dev);
1949 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1954 rc = ata_dev_revalidate(ap, dev, 0);
1958 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1959 dev->xfer_shift, (int)dev->xfer_mode);
1961 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1963 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1968 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1969 * @ap: port on which timings will be programmed
1970 * @r_failed_dev: out paramter for failed device
1972 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1973 * ata_set_mode() fails, pointer to the failing device is
1974 * returned in @r_failed_dev.
1977 * PCI/etc. bus probe sem.
1980 * 0 on success, negative errno otherwise
1982 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
1984 struct ata_device *dev;
1985 int i, rc = 0, used_dma = 0, found = 0;
1987 /* has private set_mode? */
1988 if (ap->ops->set_mode) {
1989 /* FIXME: make ->set_mode handle no device case and
1990 * return error code and failing device on failure.
1992 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1993 if (ata_dev_enabled(&ap->device[i])) {
1994 ap->ops->set_mode(ap);
2001 /* step 1: calculate xfer_mask */
2002 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2003 unsigned int pio_mask, dma_mask;
2005 dev = &ap->device[i];
2007 if (!ata_dev_enabled(dev))
2010 ata_dev_xfermask(ap, dev);
2012 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2013 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2014 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2015 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2024 /* step 2: always set host PIO timings */
2025 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2026 dev = &ap->device[i];
2027 if (!ata_dev_enabled(dev))
2030 if (!dev->pio_mode) {
2031 printk(KERN_WARNING "ata%u: dev %u no PIO support\n",
2032 ap->id, dev->devno);
2037 dev->xfer_mode = dev->pio_mode;
2038 dev->xfer_shift = ATA_SHIFT_PIO;
2039 if (ap->ops->set_piomode)
2040 ap->ops->set_piomode(ap, dev);
2043 /* step 3: set host DMA timings */
2044 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2045 dev = &ap->device[i];
2047 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2050 dev->xfer_mode = dev->dma_mode;
2051 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2052 if (ap->ops->set_dmamode)
2053 ap->ops->set_dmamode(ap, dev);
2056 /* step 4: update devices' xfer mode */
2057 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2058 dev = &ap->device[i];
2060 if (!ata_dev_enabled(dev))
2063 rc = ata_dev_set_mode(ap, dev);
2068 /* Record simplex status. If we selected DMA then the other
2069 * host channels are not permitted to do so.
2071 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2072 ap->host_set->simplex_claimed = 1;
2074 /* step5: chip specific finalisation */
2075 if (ap->ops->post_set_mode)
2076 ap->ops->post_set_mode(ap);
2080 *r_failed_dev = dev;
2085 * ata_tf_to_host - issue ATA taskfile to host controller
2086 * @ap: port to which command is being issued
2087 * @tf: ATA taskfile register set
2089 * Issues ATA taskfile register set to ATA host controller,
2090 * with proper synchronization with interrupt handler and
2094 * spin_lock_irqsave(host_set lock)
2097 static inline void ata_tf_to_host(struct ata_port *ap,
2098 const struct ata_taskfile *tf)
2100 ap->ops->tf_load(ap, tf);
2101 ap->ops->exec_command(ap, tf);
2105 * ata_busy_sleep - sleep until BSY clears, or timeout
2106 * @ap: port containing status register to be polled
2107 * @tmout_pat: impatience timeout
2108 * @tmout: overall timeout
2110 * Sleep until ATA Status register bit BSY clears,
2111 * or a timeout occurs.
2116 unsigned int ata_busy_sleep (struct ata_port *ap,
2117 unsigned long tmout_pat, unsigned long tmout)
2119 unsigned long timer_start, timeout;
2122 status = ata_busy_wait(ap, ATA_BUSY, 300);
2123 timer_start = jiffies;
2124 timeout = timer_start + tmout_pat;
2125 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2127 status = ata_busy_wait(ap, ATA_BUSY, 3);
2130 if (status & ATA_BUSY)
2131 printk(KERN_WARNING "ata%u is slow to respond, "
2132 "please be patient\n", ap->id);
2134 timeout = timer_start + tmout;
2135 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2137 status = ata_chk_status(ap);
2140 if (status & ATA_BUSY) {
2141 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
2142 ap->id, tmout / HZ);
2149 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2151 struct ata_ioports *ioaddr = &ap->ioaddr;
2152 unsigned int dev0 = devmask & (1 << 0);
2153 unsigned int dev1 = devmask & (1 << 1);
2154 unsigned long timeout;
2156 /* if device 0 was found in ata_devchk, wait for its
2160 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2162 /* if device 1 was found in ata_devchk, wait for
2163 * register access, then wait for BSY to clear
2165 timeout = jiffies + ATA_TMOUT_BOOT;
2169 ap->ops->dev_select(ap, 1);
2170 if (ap->flags & ATA_FLAG_MMIO) {
2171 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2172 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2174 nsect = inb(ioaddr->nsect_addr);
2175 lbal = inb(ioaddr->lbal_addr);
2177 if ((nsect == 1) && (lbal == 1))
2179 if (time_after(jiffies, timeout)) {
2183 msleep(50); /* give drive a breather */
2186 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2188 /* is all this really necessary? */
2189 ap->ops->dev_select(ap, 0);
2191 ap->ops->dev_select(ap, 1);
2193 ap->ops->dev_select(ap, 0);
2196 static unsigned int ata_bus_softreset(struct ata_port *ap,
2197 unsigned int devmask)
2199 struct ata_ioports *ioaddr = &ap->ioaddr;
2201 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2203 /* software reset. causes dev0 to be selected */
2204 if (ap->flags & ATA_FLAG_MMIO) {
2205 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2206 udelay(20); /* FIXME: flush */
2207 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2208 udelay(20); /* FIXME: flush */
2209 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2211 outb(ap->ctl, ioaddr->ctl_addr);
2213 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2215 outb(ap->ctl, ioaddr->ctl_addr);
2218 /* spec mandates ">= 2ms" before checking status.
2219 * We wait 150ms, because that was the magic delay used for
2220 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2221 * between when the ATA command register is written, and then
2222 * status is checked. Because waiting for "a while" before
2223 * checking status is fine, post SRST, we perform this magic
2224 * delay here as well.
2226 * Old drivers/ide uses the 2mS rule and then waits for ready
2230 /* Before we perform post reset processing we want to see if
2231 * the bus shows 0xFF because the odd clown forgets the D7
2232 * pulldown resistor.
2234 if (ata_check_status(ap) == 0xFF) {
2235 printk(KERN_ERR "ata%u: SRST failed (status 0xFF)\n", ap->id);
2236 return AC_ERR_OTHER;
2239 ata_bus_post_reset(ap, devmask);
2245 * ata_bus_reset - reset host port and associated ATA channel
2246 * @ap: port to reset
2248 * This is typically the first time we actually start issuing
2249 * commands to the ATA channel. We wait for BSY to clear, then
2250 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2251 * result. Determine what devices, if any, are on the channel
2252 * by looking at the device 0/1 error register. Look at the signature
2253 * stored in each device's taskfile registers, to determine if
2254 * the device is ATA or ATAPI.
2257 * PCI/etc. bus probe sem.
2258 * Obtains host_set lock.
2261 * Sets ATA_FLAG_DISABLED if bus reset fails.
2264 void ata_bus_reset(struct ata_port *ap)
2266 struct ata_ioports *ioaddr = &ap->ioaddr;
2267 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2269 unsigned int dev0, dev1 = 0, devmask = 0;
2271 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2273 /* determine if device 0/1 are present */
2274 if (ap->flags & ATA_FLAG_SATA_RESET)
2277 dev0 = ata_devchk(ap, 0);
2279 dev1 = ata_devchk(ap, 1);
2283 devmask |= (1 << 0);
2285 devmask |= (1 << 1);
2287 /* select device 0 again */
2288 ap->ops->dev_select(ap, 0);
2290 /* issue bus reset */
2291 if (ap->flags & ATA_FLAG_SRST)
2292 if (ata_bus_softreset(ap, devmask))
2296 * determine by signature whether we have ATA or ATAPI devices
2298 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2299 if ((slave_possible) && (err != 0x81))
2300 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2302 /* re-enable interrupts */
2303 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2306 /* is double-select really necessary? */
2307 if (ap->device[1].class != ATA_DEV_NONE)
2308 ap->ops->dev_select(ap, 1);
2309 if (ap->device[0].class != ATA_DEV_NONE)
2310 ap->ops->dev_select(ap, 0);
2312 /* if no devices were detected, disable this port */
2313 if ((ap->device[0].class == ATA_DEV_NONE) &&
2314 (ap->device[1].class == ATA_DEV_NONE))
2317 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2318 /* set up device control for ATA_FLAG_SATA_RESET */
2319 if (ap->flags & ATA_FLAG_MMIO)
2320 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2322 outb(ap->ctl, ioaddr->ctl_addr);
2329 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2330 ap->ops->port_disable(ap);
2335 static int sata_phy_resume(struct ata_port *ap)
2337 unsigned long timeout = jiffies + (HZ * 5);
2338 u32 scontrol, sstatus;
2340 scontrol = scr_read(ap, SCR_CONTROL);
2341 scontrol = (scontrol & 0x0f0) | 0x300;
2342 scr_write_flush(ap, SCR_CONTROL, scontrol);
2344 /* Wait for phy to become ready, if necessary. */
2347 sstatus = scr_read(ap, SCR_STATUS);
2348 if ((sstatus & 0xf) != 1)
2350 } while (time_before(jiffies, timeout));
2356 * ata_std_probeinit - initialize probing
2357 * @ap: port to be probed
2359 * @ap is about to be probed. Initialize it. This function is
2360 * to be used as standard callback for ata_drive_probe_reset().
2362 * NOTE!!! Do not use this function as probeinit if a low level
2363 * driver implements only hardreset. Just pass NULL as probeinit
2364 * in that case. Using this function is probably okay but doing
2365 * so makes reset sequence different from the original
2366 * ->phy_reset implementation and Jeff nervous. :-P
2368 void ata_std_probeinit(struct ata_port *ap)
2370 if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
2373 /* set cable type and resume link */
2374 ap->cbl = ATA_CBL_SATA;
2375 sata_phy_resume(ap);
2377 /* init sata_spd_limit to the current value */
2378 spd = (scr_read(ap, SCR_CONTROL) & 0xf0) >> 4;
2380 ap->sata_spd_limit &= (1 << spd) - 1;
2382 /* wait for device */
2383 if (sata_dev_present(ap))
2384 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2389 * ata_std_softreset - reset host port via ATA SRST
2390 * @ap: port to reset
2391 * @classes: resulting classes of attached devices
2393 * Reset host port using ATA SRST. This function is to be used
2394 * as standard callback for ata_drive_*_reset() functions.
2397 * Kernel thread context (may sleep)
2400 * 0 on success, -errno otherwise.
2402 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2404 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2405 unsigned int devmask = 0, err_mask;
2410 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2411 classes[0] = ATA_DEV_NONE;
2415 /* determine if device 0/1 are present */
2416 if (ata_devchk(ap, 0))
2417 devmask |= (1 << 0);
2418 if (slave_possible && ata_devchk(ap, 1))
2419 devmask |= (1 << 1);
2421 /* select device 0 again */
2422 ap->ops->dev_select(ap, 0);
2424 /* issue bus reset */
2425 DPRINTK("about to softreset, devmask=%x\n", devmask);
2426 err_mask = ata_bus_softreset(ap, devmask);
2428 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2433 /* determine by signature whether we have ATA or ATAPI devices */
2434 classes[0] = ata_dev_try_classify(ap, 0, &err);
2435 if (slave_possible && err != 0x81)
2436 classes[1] = ata_dev_try_classify(ap, 1, &err);
2439 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2444 * sata_std_hardreset - reset host port via SATA phy reset
2445 * @ap: port to reset
2446 * @class: resulting class of attached device
2448 * SATA phy-reset host port using DET bits of SControl register.
2449 * This function is to be used as standard callback for
2450 * ata_drive_*_reset().
2453 * Kernel thread context (may sleep)
2456 * 0 on success, -errno otherwise.
2458 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2464 if (sata_set_spd_needed(ap)) {
2465 /* SATA spec says nothing about how to reconfigure
2466 * spd. To be on the safe side, turn off phy during
2467 * reconfiguration. This works for at least ICH7 AHCI
2470 scontrol = scr_read(ap, SCR_CONTROL);
2471 scontrol = (scontrol & 0x0f0) | 0x302;
2472 scr_write_flush(ap, SCR_CONTROL, scontrol);
2477 /* issue phy wake/reset */
2478 scontrol = scr_read(ap, SCR_CONTROL);
2479 scontrol = (scontrol & 0x0f0) | 0x301;
2480 scr_write_flush(ap, SCR_CONTROL, scontrol);
2482 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2483 * 10.4.2 says at least 1 ms.
2487 /* bring phy back */
2488 sata_phy_resume(ap);
2490 /* TODO: phy layer with polling, timeouts, etc. */
2491 if (!sata_dev_present(ap)) {
2492 *class = ATA_DEV_NONE;
2493 DPRINTK("EXIT, link offline\n");
2497 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2499 "ata%u: COMRESET failed (device not ready)\n", ap->id);
2503 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2505 *class = ata_dev_try_classify(ap, 0, NULL);
2507 DPRINTK("EXIT, class=%u\n", *class);
2512 * ata_std_postreset - standard postreset callback
2513 * @ap: the target ata_port
2514 * @classes: classes of attached devices
2516 * This function is invoked after a successful reset. Note that
2517 * the device might have been reset more than once using
2518 * different reset methods before postreset is invoked.
2520 * This function is to be used as standard callback for
2521 * ata_drive_*_reset().
2524 * Kernel thread context (may sleep)
2526 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2530 /* print link status */
2531 if (ap->cbl == ATA_CBL_SATA)
2532 sata_print_link_status(ap);
2534 /* re-enable interrupts */
2535 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2538 /* is double-select really necessary? */
2539 if (classes[0] != ATA_DEV_NONE)
2540 ap->ops->dev_select(ap, 1);
2541 if (classes[1] != ATA_DEV_NONE)
2542 ap->ops->dev_select(ap, 0);
2544 /* bail out if no device is present */
2545 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2546 DPRINTK("EXIT, no device\n");
2550 /* set up device control */
2551 if (ap->ioaddr.ctl_addr) {
2552 if (ap->flags & ATA_FLAG_MMIO)
2553 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2555 outb(ap->ctl, ap->ioaddr.ctl_addr);
2562 * ata_std_probe_reset - standard probe reset method
2563 * @ap: prot to perform probe-reset
2564 * @classes: resulting classes of attached devices
2566 * The stock off-the-shelf ->probe_reset method.
2569 * Kernel thread context (may sleep)
2572 * 0 on success, -errno otherwise.
2574 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2576 ata_reset_fn_t hardreset;
2579 if (ap->cbl == ATA_CBL_SATA && ap->ops->scr_read)
2580 hardreset = sata_std_hardreset;
2582 return ata_drive_probe_reset(ap, ata_std_probeinit,
2583 ata_std_softreset, hardreset,
2584 ata_std_postreset, classes);
2587 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2588 unsigned int *classes)
2592 for (i = 0; i < ATA_MAX_DEVICES; i++)
2593 classes[i] = ATA_DEV_UNKNOWN;
2595 rc = reset(ap, classes);
2599 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2600 * is complete and convert all ATA_DEV_UNKNOWN to
2603 for (i = 0; i < ATA_MAX_DEVICES; i++)
2604 if (classes[i] != ATA_DEV_UNKNOWN)
2607 if (i < ATA_MAX_DEVICES)
2608 for (i = 0; i < ATA_MAX_DEVICES; i++)
2609 if (classes[i] == ATA_DEV_UNKNOWN)
2610 classes[i] = ATA_DEV_NONE;
2616 * ata_drive_probe_reset - Perform probe reset with given methods
2617 * @ap: port to reset
2618 * @probeinit: probeinit method (can be NULL)
2619 * @softreset: softreset method (can be NULL)
2620 * @hardreset: hardreset method (can be NULL)
2621 * @postreset: postreset method (can be NULL)
2622 * @classes: resulting classes of attached devices
2624 * Reset the specified port and classify attached devices using
2625 * given methods. This function prefers softreset but tries all
2626 * possible reset sequences to reset and classify devices. This
2627 * function is intended to be used for constructing ->probe_reset
2628 * callback by low level drivers.
2630 * Reset methods should follow the following rules.
2632 * - Return 0 on sucess, -errno on failure.
2633 * - If classification is supported, fill classes[] with
2634 * recognized class codes.
2635 * - If classification is not supported, leave classes[] alone.
2638 * Kernel thread context (may sleep)
2641 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2642 * if classification fails, and any error code from reset
2645 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2646 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2647 ata_postreset_fn_t postreset, unsigned int *classes)
2654 if (softreset && !sata_set_spd_needed(ap)) {
2655 rc = ata_do_reset(ap, softreset, classes);
2656 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2658 printk(KERN_INFO "ata%u: softreset failed, will try "
2659 "hardreset in 5 secs\n", ap->id);
2667 rc = ata_do_reset(ap, hardreset, classes);
2669 if (classes[0] != ATA_DEV_UNKNOWN)
2674 if (sata_down_spd_limit(ap))
2677 printk(KERN_INFO "ata%u: hardreset failed, will retry "
2678 "in 5 secs\n", ap->id);
2683 printk(KERN_INFO "ata%u: hardreset succeeded without "
2684 "classification, will retry softreset in 5 secs\n",
2688 rc = ata_do_reset(ap, softreset, classes);
2694 postreset(ap, classes);
2695 if (classes[0] == ATA_DEV_UNKNOWN)
2702 * ata_dev_same_device - Determine whether new ID matches configured device
2703 * @ap: port on which the device to compare against resides
2704 * @dev: device to compare against
2705 * @new_class: class of the new device
2706 * @new_id: IDENTIFY page of the new device
2708 * Compare @new_class and @new_id against @dev and determine
2709 * whether @dev is the device indicated by @new_class and
2716 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2718 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2719 unsigned int new_class, const u16 *new_id)
2721 const u16 *old_id = dev->id;
2722 unsigned char model[2][41], serial[2][21];
2725 if (dev->class != new_class) {
2727 "ata%u: dev %u class mismatch %d != %d\n",
2728 ap->id, dev->devno, dev->class, new_class);
2732 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2733 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2734 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2735 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2736 new_n_sectors = ata_id_n_sectors(new_id);
2738 if (strcmp(model[0], model[1])) {
2740 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2741 ap->id, dev->devno, model[0], model[1]);
2745 if (strcmp(serial[0], serial[1])) {
2747 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2748 ap->id, dev->devno, serial[0], serial[1]);
2752 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2754 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2755 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2756 (unsigned long long)new_n_sectors);
2764 * ata_dev_revalidate - Revalidate ATA device
2765 * @ap: port on which the device to revalidate resides
2766 * @dev: device to revalidate
2767 * @post_reset: is this revalidation after reset?
2769 * Re-read IDENTIFY page and make sure @dev is still attached to
2773 * Kernel thread context (may sleep)
2776 * 0 on success, negative errno otherwise
2778 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2781 unsigned int class = dev->class;
2782 u16 *id = (void *)ap->sector_buf;
2785 if (!ata_dev_enabled(dev)) {
2791 rc = ata_dev_read_id(ap, dev, &class, post_reset, id);
2795 /* is the device still there? */
2796 if (!ata_dev_same_device(ap, dev, class, id)) {
2801 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
2803 /* configure device according to the new ID */
2804 rc = ata_dev_configure(ap, dev, 0);
2809 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2810 ap->id, dev->devno, rc);
2814 static const char * const ata_dma_blacklist [] = {
2815 "WDC AC11000H", NULL,
2816 "WDC AC22100H", NULL,
2817 "WDC AC32500H", NULL,
2818 "WDC AC33100H", NULL,
2819 "WDC AC31600H", NULL,
2820 "WDC AC32100H", "24.09P07",
2821 "WDC AC23200L", "21.10N21",
2822 "Compaq CRD-8241B", NULL,
2827 "SanDisk SDP3B", NULL,
2828 "SanDisk SDP3B-64", NULL,
2829 "SANYO CD-ROM CRD", NULL,
2830 "HITACHI CDR-8", NULL,
2831 "HITACHI CDR-8335", NULL,
2832 "HITACHI CDR-8435", NULL,
2833 "Toshiba CD-ROM XM-6202B", NULL,
2834 "TOSHIBA CD-ROM XM-1702BC", NULL,
2836 "E-IDE CD-ROM CR-840", NULL,
2837 "CD-ROM Drive/F5A", NULL,
2838 "WPI CDD-820", NULL,
2839 "SAMSUNG CD-ROM SC-148C", NULL,
2840 "SAMSUNG CD-ROM SC", NULL,
2841 "SanDisk SDP3B-64", NULL,
2842 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2843 "_NEC DV5800A", NULL,
2844 "SAMSUNG CD-ROM SN-124", "N001"
2847 static int ata_strim(char *s, size_t len)
2849 len = strnlen(s, len);
2851 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2852 while ((len > 0) && (s[len - 1] == ' ')) {
2859 static int ata_dma_blacklisted(const struct ata_device *dev)
2861 unsigned char model_num[40];
2862 unsigned char model_rev[16];
2863 unsigned int nlen, rlen;
2866 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2868 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2870 nlen = ata_strim(model_num, sizeof(model_num));
2871 rlen = ata_strim(model_rev, sizeof(model_rev));
2873 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2874 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2875 if (ata_dma_blacklist[i+1] == NULL)
2877 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2885 * ata_dev_xfermask - Compute supported xfermask of the given device
2886 * @ap: Port on which the device to compute xfermask for resides
2887 * @dev: Device to compute xfermask for
2889 * Compute supported xfermask of @dev and store it in
2890 * dev->*_mask. This function is responsible for applying all
2891 * known limits including host controller limits, device
2894 * FIXME: The current implementation limits all transfer modes to
2895 * the fastest of the lowested device on the port. This is not
2896 * required on most controllers.
2901 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2903 struct ata_host_set *hs = ap->host_set;
2904 unsigned long xfer_mask;
2907 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2908 ap->mwdma_mask, ap->udma_mask);
2910 /* Apply cable rule here. Don't apply it early because when
2911 * we handle hot plug the cable type can itself change.
2913 if (ap->cbl == ATA_CBL_PATA40)
2914 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2916 /* FIXME: Use port-wide xfermask for now */
2917 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2918 struct ata_device *d = &ap->device[i];
2920 if (ata_dev_absent(d))
2923 if (ata_dev_disabled(d)) {
2924 /* to avoid violating device selection timing */
2925 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2926 UINT_MAX, UINT_MAX);
2930 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2931 d->mwdma_mask, d->udma_mask);
2932 xfer_mask &= ata_id_xfermask(d->id);
2933 if (ata_dma_blacklisted(d))
2934 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2937 if (ata_dma_blacklisted(dev))
2938 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2939 "disabling DMA\n", ap->id, dev->devno);
2941 if (hs->flags & ATA_HOST_SIMPLEX) {
2942 if (hs->simplex_claimed)
2943 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2946 if (ap->ops->mode_filter)
2947 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2949 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
2950 &dev->mwdma_mask, &dev->udma_mask);
2954 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2955 * @ap: Port associated with device @dev
2956 * @dev: Device to which command will be sent
2958 * Issue SET FEATURES - XFER MODE command to device @dev
2962 * PCI/etc. bus probe sem.
2965 * 0 on success, AC_ERR_* mask otherwise.
2968 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2969 struct ata_device *dev)
2971 struct ata_taskfile tf;
2972 unsigned int err_mask;
2974 /* set up set-features taskfile */
2975 DPRINTK("set features - xfer mode\n");
2977 ata_tf_init(ap, &tf, dev->devno);
2978 tf.command = ATA_CMD_SET_FEATURES;
2979 tf.feature = SETFEATURES_XFER;
2980 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2981 tf.protocol = ATA_PROT_NODATA;
2982 tf.nsect = dev->xfer_mode;
2984 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
2986 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2991 * ata_dev_init_params - Issue INIT DEV PARAMS command
2992 * @ap: Port associated with device @dev
2993 * @dev: Device to which command will be sent
2996 * Kernel thread context (may sleep)
2999 * 0 on success, AC_ERR_* mask otherwise.
3002 static unsigned int ata_dev_init_params(struct ata_port *ap,
3003 struct ata_device *dev,
3007 struct ata_taskfile tf;
3008 unsigned int err_mask;
3010 /* Number of sectors per track 1-255. Number of heads 1-16 */
3011 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3012 return AC_ERR_INVALID;
3014 /* set up init dev params taskfile */
3015 DPRINTK("init dev params \n");
3017 ata_tf_init(ap, &tf, dev->devno);
3018 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3019 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3020 tf.protocol = ATA_PROT_NODATA;
3022 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3024 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
3026 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3031 * ata_sg_clean - Unmap DMA memory associated with command
3032 * @qc: Command containing DMA memory to be released
3034 * Unmap all mapped DMA memory associated with this command.
3037 * spin_lock_irqsave(host_set lock)
3040 static void ata_sg_clean(struct ata_queued_cmd *qc)
3042 struct ata_port *ap = qc->ap;
3043 struct scatterlist *sg = qc->__sg;
3044 int dir = qc->dma_dir;
3045 void *pad_buf = NULL;
3047 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3048 WARN_ON(sg == NULL);
3050 if (qc->flags & ATA_QCFLAG_SINGLE)
3051 WARN_ON(qc->n_elem > 1);
3053 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3055 /* if we padded the buffer out to 32-bit bound, and data
3056 * xfer direction is from-device, we must copy from the
3057 * pad buffer back into the supplied buffer
3059 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3060 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3062 if (qc->flags & ATA_QCFLAG_SG) {
3064 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3065 /* restore last sg */
3066 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3068 struct scatterlist *psg = &qc->pad_sgent;
3069 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3070 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3071 kunmap_atomic(addr, KM_IRQ0);
3075 dma_unmap_single(ap->dev,
3076 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3079 sg->length += qc->pad_len;
3081 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3082 pad_buf, qc->pad_len);
3085 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3090 * ata_fill_sg - Fill PCI IDE PRD table
3091 * @qc: Metadata associated with taskfile to be transferred
3093 * Fill PCI IDE PRD (scatter-gather) table with segments
3094 * associated with the current disk command.
3097 * spin_lock_irqsave(host_set lock)
3100 static void ata_fill_sg(struct ata_queued_cmd *qc)
3102 struct ata_port *ap = qc->ap;
3103 struct scatterlist *sg;
3106 WARN_ON(qc->__sg == NULL);
3107 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3110 ata_for_each_sg(sg, qc) {
3114 /* determine if physical DMA addr spans 64K boundary.
3115 * Note h/w doesn't support 64-bit, so we unconditionally
3116 * truncate dma_addr_t to u32.
3118 addr = (u32) sg_dma_address(sg);
3119 sg_len = sg_dma_len(sg);
3122 offset = addr & 0xffff;
3124 if ((offset + sg_len) > 0x10000)
3125 len = 0x10000 - offset;
3127 ap->prd[idx].addr = cpu_to_le32(addr);
3128 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3129 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3138 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3141 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3142 * @qc: Metadata associated with taskfile to check
3144 * Allow low-level driver to filter ATA PACKET commands, returning
3145 * a status indicating whether or not it is OK to use DMA for the
3146 * supplied PACKET command.
3149 * spin_lock_irqsave(host_set lock)
3151 * RETURNS: 0 when ATAPI DMA can be used
3154 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3156 struct ata_port *ap = qc->ap;
3157 int rc = 0; /* Assume ATAPI DMA is OK by default */
3159 if (ap->ops->check_atapi_dma)
3160 rc = ap->ops->check_atapi_dma(qc);
3165 * ata_qc_prep - Prepare taskfile for submission
3166 * @qc: Metadata associated with taskfile to be prepared
3168 * Prepare ATA taskfile for submission.
3171 * spin_lock_irqsave(host_set lock)
3173 void ata_qc_prep(struct ata_queued_cmd *qc)
3175 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3181 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3184 * ata_sg_init_one - Associate command with memory buffer
3185 * @qc: Command to be associated
3186 * @buf: Memory buffer
3187 * @buflen: Length of memory buffer, in bytes.
3189 * Initialize the data-related elements of queued_cmd @qc
3190 * to point to a single memory buffer, @buf of byte length @buflen.
3193 * spin_lock_irqsave(host_set lock)
3196 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3198 struct scatterlist *sg;
3200 qc->flags |= ATA_QCFLAG_SINGLE;
3202 memset(&qc->sgent, 0, sizeof(qc->sgent));
3203 qc->__sg = &qc->sgent;
3205 qc->orig_n_elem = 1;
3209 sg_init_one(sg, buf, buflen);
3213 * ata_sg_init - Associate command with scatter-gather table.
3214 * @qc: Command to be associated
3215 * @sg: Scatter-gather table.
3216 * @n_elem: Number of elements in s/g table.
3218 * Initialize the data-related elements of queued_cmd @qc
3219 * to point to a scatter-gather table @sg, containing @n_elem
3223 * spin_lock_irqsave(host_set lock)
3226 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3227 unsigned int n_elem)
3229 qc->flags |= ATA_QCFLAG_SG;
3231 qc->n_elem = n_elem;
3232 qc->orig_n_elem = n_elem;
3236 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3237 * @qc: Command with memory buffer to be mapped.
3239 * DMA-map the memory buffer associated with queued_cmd @qc.
3242 * spin_lock_irqsave(host_set lock)
3245 * Zero on success, negative on error.
3248 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3250 struct ata_port *ap = qc->ap;
3251 int dir = qc->dma_dir;
3252 struct scatterlist *sg = qc->__sg;
3253 dma_addr_t dma_address;
3256 /* we must lengthen transfers to end on a 32-bit boundary */
3257 qc->pad_len = sg->length & 3;
3259 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3260 struct scatterlist *psg = &qc->pad_sgent;
3262 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3264 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3266 if (qc->tf.flags & ATA_TFLAG_WRITE)
3267 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3270 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3271 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3273 sg->length -= qc->pad_len;
3274 if (sg->length == 0)
3277 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3278 sg->length, qc->pad_len);
3286 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3288 if (dma_mapping_error(dma_address)) {
3290 sg->length += qc->pad_len;
3294 sg_dma_address(sg) = dma_address;
3295 sg_dma_len(sg) = sg->length;
3298 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3299 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3305 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3306 * @qc: Command with scatter-gather table to be mapped.
3308 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3311 * spin_lock_irqsave(host_set lock)
3314 * Zero on success, negative on error.
3318 static int ata_sg_setup(struct ata_queued_cmd *qc)
3320 struct ata_port *ap = qc->ap;
3321 struct scatterlist *sg = qc->__sg;
3322 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3323 int n_elem, pre_n_elem, dir, trim_sg = 0;
3325 VPRINTK("ENTER, ata%u\n", ap->id);
3326 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3328 /* we must lengthen transfers to end on a 32-bit boundary */
3329 qc->pad_len = lsg->length & 3;
3331 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3332 struct scatterlist *psg = &qc->pad_sgent;
3333 unsigned int offset;
3335 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3337 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3340 * psg->page/offset are used to copy to-be-written
3341 * data in this function or read data in ata_sg_clean.
3343 offset = lsg->offset + lsg->length - qc->pad_len;
3344 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3345 psg->offset = offset_in_page(offset);
3347 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3348 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3349 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3350 kunmap_atomic(addr, KM_IRQ0);
3353 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3354 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3356 lsg->length -= qc->pad_len;
3357 if (lsg->length == 0)
3360 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3361 qc->n_elem - 1, lsg->length, qc->pad_len);
3364 pre_n_elem = qc->n_elem;
3365 if (trim_sg && pre_n_elem)
3374 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3376 /* restore last sg */
3377 lsg->length += qc->pad_len;
3381 DPRINTK("%d sg elements mapped\n", n_elem);
3384 qc->n_elem = n_elem;
3390 * ata_poll_qc_complete - turn irq back on and finish qc
3391 * @qc: Command to complete
3392 * @err_mask: ATA status register content
3395 * None. (grabs host lock)
3398 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3400 struct ata_port *ap = qc->ap;
3401 unsigned long flags;
3403 spin_lock_irqsave(&ap->host_set->lock, flags);
3404 ap->flags &= ~ATA_FLAG_NOINTR;
3406 ata_qc_complete(qc);
3407 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3411 * ata_pio_poll - poll using PIO, depending on current state
3412 * @qc: qc in progress
3415 * None. (executing in kernel thread context)
3418 * timeout value to use
3420 static unsigned long ata_pio_poll(struct ata_queued_cmd *qc)
3422 struct ata_port *ap = qc->ap;
3424 unsigned int poll_state = HSM_ST_UNKNOWN;
3425 unsigned int reg_state = HSM_ST_UNKNOWN;
3427 switch (ap->hsm_task_state) {
3430 poll_state = HSM_ST_POLL;
3434 case HSM_ST_LAST_POLL:
3435 poll_state = HSM_ST_LAST_POLL;
3436 reg_state = HSM_ST_LAST;
3443 status = ata_chk_status(ap);
3444 if (status & ATA_BUSY) {
3445 if (time_after(jiffies, ap->pio_task_timeout)) {
3446 qc->err_mask |= AC_ERR_TIMEOUT;
3447 ap->hsm_task_state = HSM_ST_TMOUT;
3450 ap->hsm_task_state = poll_state;
3451 return ATA_SHORT_PAUSE;
3454 ap->hsm_task_state = reg_state;
3459 * ata_pio_complete - check if drive is busy or idle
3460 * @qc: qc to complete
3463 * None. (executing in kernel thread context)
3466 * Non-zero if qc completed, zero otherwise.
3468 static int ata_pio_complete(struct ata_queued_cmd *qc)
3470 struct ata_port *ap = qc->ap;
3474 * This is purely heuristic. This is a fast path. Sometimes when
3475 * we enter, BSY will be cleared in a chk-status or two. If not,
3476 * the drive is probably seeking or something. Snooze for a couple
3477 * msecs, then chk-status again. If still busy, fall back to
3478 * HSM_ST_POLL state.
3480 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3481 if (drv_stat & ATA_BUSY) {
3483 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3484 if (drv_stat & ATA_BUSY) {
3485 ap->hsm_task_state = HSM_ST_LAST_POLL;
3486 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3491 drv_stat = ata_wait_idle(ap);
3492 if (!ata_ok(drv_stat)) {
3493 qc->err_mask |= __ac_err_mask(drv_stat);
3494 ap->hsm_task_state = HSM_ST_ERR;
3498 ap->hsm_task_state = HSM_ST_IDLE;
3500 WARN_ON(qc->err_mask);
3501 ata_poll_qc_complete(qc);
3503 /* another command may start at this point */
3510 * swap_buf_le16 - swap halves of 16-bit words in place
3511 * @buf: Buffer to swap
3512 * @buf_words: Number of 16-bit words in buffer.
3514 * Swap halves of 16-bit words if needed to convert from
3515 * little-endian byte order to native cpu byte order, or
3519 * Inherited from caller.
3521 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3526 for (i = 0; i < buf_words; i++)
3527 buf[i] = le16_to_cpu(buf[i]);
3528 #endif /* __BIG_ENDIAN */
3532 * ata_mmio_data_xfer - Transfer data by MMIO
3533 * @ap: port to read/write
3535 * @buflen: buffer length
3536 * @write_data: read/write
3538 * Transfer data from/to the device data register by MMIO.
3541 * Inherited from caller.
3544 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3545 unsigned int buflen, int write_data)
3548 unsigned int words = buflen >> 1;
3549 u16 *buf16 = (u16 *) buf;
3550 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3552 /* Transfer multiple of 2 bytes */
3554 for (i = 0; i < words; i++)
3555 writew(le16_to_cpu(buf16[i]), mmio);
3557 for (i = 0; i < words; i++)
3558 buf16[i] = cpu_to_le16(readw(mmio));
3561 /* Transfer trailing 1 byte, if any. */
3562 if (unlikely(buflen & 0x01)) {
3563 u16 align_buf[1] = { 0 };
3564 unsigned char *trailing_buf = buf + buflen - 1;
3567 memcpy(align_buf, trailing_buf, 1);
3568 writew(le16_to_cpu(align_buf[0]), mmio);
3570 align_buf[0] = cpu_to_le16(readw(mmio));
3571 memcpy(trailing_buf, align_buf, 1);
3577 * ata_pio_data_xfer - Transfer data by PIO
3578 * @ap: port to read/write
3580 * @buflen: buffer length
3581 * @write_data: read/write
3583 * Transfer data from/to the device data register by PIO.
3586 * Inherited from caller.
3589 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3590 unsigned int buflen, int write_data)
3592 unsigned int words = buflen >> 1;
3594 /* Transfer multiple of 2 bytes */
3596 outsw(ap->ioaddr.data_addr, buf, words);
3598 insw(ap->ioaddr.data_addr, buf, words);
3600 /* Transfer trailing 1 byte, if any. */
3601 if (unlikely(buflen & 0x01)) {
3602 u16 align_buf[1] = { 0 };
3603 unsigned char *trailing_buf = buf + buflen - 1;
3606 memcpy(align_buf, trailing_buf, 1);
3607 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3609 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3610 memcpy(trailing_buf, align_buf, 1);
3616 * ata_data_xfer - Transfer data from/to the data register.
3617 * @ap: port to read/write
3619 * @buflen: buffer length
3620 * @do_write: read/write
3622 * Transfer data from/to the device data register.
3625 * Inherited from caller.
3628 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3629 unsigned int buflen, int do_write)
3631 /* Make the crap hardware pay the costs not the good stuff */
3632 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3633 unsigned long flags;
3634 local_irq_save(flags);
3635 if (ap->flags & ATA_FLAG_MMIO)
3636 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3638 ata_pio_data_xfer(ap, buf, buflen, do_write);
3639 local_irq_restore(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);
3649 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3650 * @qc: Command on going
3652 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3655 * Inherited from caller.
3658 static void ata_pio_sector(struct ata_queued_cmd *qc)
3660 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3661 struct scatterlist *sg = qc->__sg;
3662 struct ata_port *ap = qc->ap;
3664 unsigned int offset;
3667 if (qc->cursect == (qc->nsect - 1))
3668 ap->hsm_task_state = HSM_ST_LAST;
3670 page = sg[qc->cursg].page;
3671 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3673 /* get the current page and offset */
3674 page = nth_page(page, (offset >> PAGE_SHIFT));
3675 offset %= PAGE_SIZE;
3677 buf = kmap(page) + offset;
3682 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3687 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3689 /* do the actual data transfer */
3690 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3691 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3697 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3698 * @qc: Command on going
3699 * @bytes: number of bytes
3701 * Transfer Transfer data from/to the ATAPI device.
3704 * Inherited from caller.
3708 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3710 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3711 struct scatterlist *sg = qc->__sg;
3712 struct ata_port *ap = qc->ap;
3715 unsigned int offset, count;
3717 if (qc->curbytes + bytes >= qc->nbytes)
3718 ap->hsm_task_state = HSM_ST_LAST;
3721 if (unlikely(qc->cursg >= qc->n_elem)) {
3723 * The end of qc->sg is reached and the device expects
3724 * more data to transfer. In order not to overrun qc->sg
3725 * and fulfill length specified in the byte count register,
3726 * - for read case, discard trailing data from the device
3727 * - for write case, padding zero data to the device
3729 u16 pad_buf[1] = { 0 };
3730 unsigned int words = bytes >> 1;
3733 if (words) /* warning if bytes > 1 */
3734 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3737 for (i = 0; i < words; i++)
3738 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3740 ap->hsm_task_state = HSM_ST_LAST;
3744 sg = &qc->__sg[qc->cursg];
3747 offset = sg->offset + qc->cursg_ofs;
3749 /* get the current page and offset */
3750 page = nth_page(page, (offset >> PAGE_SHIFT));
3751 offset %= PAGE_SIZE;
3753 /* don't overrun current sg */
3754 count = min(sg->length - qc->cursg_ofs, bytes);
3756 /* don't cross page boundaries */
3757 count = min(count, (unsigned int)PAGE_SIZE - offset);
3759 buf = kmap(page) + offset;
3762 qc->curbytes += count;
3763 qc->cursg_ofs += count;
3765 if (qc->cursg_ofs == sg->length) {
3770 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3772 /* do the actual data transfer */
3773 ata_data_xfer(ap, buf, count, do_write);
3782 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3783 * @qc: Command on going
3785 * Transfer Transfer data from/to the ATAPI device.
3788 * Inherited from caller.
3791 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3793 struct ata_port *ap = qc->ap;
3794 struct ata_device *dev = qc->dev;
3795 unsigned int ireason, bc_lo, bc_hi, bytes;
3796 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3798 ap->ops->tf_read(ap, &qc->tf);
3799 ireason = qc->tf.nsect;
3800 bc_lo = qc->tf.lbam;
3801 bc_hi = qc->tf.lbah;
3802 bytes = (bc_hi << 8) | bc_lo;
3804 /* shall be cleared to zero, indicating xfer of data */
3805 if (ireason & (1 << 0))
3808 /* make sure transfer direction matches expected */
3809 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3810 if (do_write != i_write)
3813 __atapi_pio_bytes(qc, bytes);
3818 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3819 ap->id, dev->devno);
3820 qc->err_mask |= AC_ERR_HSM;
3821 ap->hsm_task_state = HSM_ST_ERR;
3825 * ata_pio_block - start PIO on a block
3826 * @qc: qc to transfer block for
3829 * None. (executing in kernel thread context)
3831 static void ata_pio_block(struct ata_queued_cmd *qc)
3833 struct ata_port *ap = qc->ap;
3837 * This is purely heuristic. This is a fast path.
3838 * Sometimes when we enter, BSY will be cleared in
3839 * a chk-status or two. If not, the drive is probably seeking
3840 * or something. Snooze for a couple msecs, then
3841 * chk-status again. If still busy, fall back to
3842 * HSM_ST_POLL state.
3844 status = ata_busy_wait(ap, ATA_BUSY, 5);
3845 if (status & ATA_BUSY) {
3847 status = ata_busy_wait(ap, ATA_BUSY, 10);
3848 if (status & ATA_BUSY) {
3849 ap->hsm_task_state = HSM_ST_POLL;
3850 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3856 if (status & (ATA_ERR | ATA_DF)) {
3857 qc->err_mask |= AC_ERR_DEV;
3858 ap->hsm_task_state = HSM_ST_ERR;
3862 /* transfer data if any */
3863 if (is_atapi_taskfile(&qc->tf)) {
3864 /* DRQ=0 means no more data to transfer */
3865 if ((status & ATA_DRQ) == 0) {
3866 ap->hsm_task_state = HSM_ST_LAST;
3870 atapi_pio_bytes(qc);
3872 /* handle BSY=0, DRQ=0 as error */
3873 if ((status & ATA_DRQ) == 0) {
3874 qc->err_mask |= AC_ERR_HSM;
3875 ap->hsm_task_state = HSM_ST_ERR;
3883 static void ata_pio_error(struct ata_queued_cmd *qc)
3885 struct ata_port *ap = qc->ap;
3887 if (qc->tf.command != ATA_CMD_PACKET)
3888 printk(KERN_WARNING "ata%u: dev %u PIO error\n",
3889 ap->id, qc->dev->devno);
3891 /* make sure qc->err_mask is available to
3892 * know what's wrong and recover
3894 WARN_ON(qc->err_mask == 0);
3896 ap->hsm_task_state = HSM_ST_IDLE;
3898 ata_poll_qc_complete(qc);
3901 static void ata_pio_task(void *_data)
3903 struct ata_queued_cmd *qc = _data;
3904 struct ata_port *ap = qc->ap;
3905 unsigned long timeout;
3912 switch (ap->hsm_task_state) {
3921 qc_completed = ata_pio_complete(qc);
3925 case HSM_ST_LAST_POLL:
3926 timeout = ata_pio_poll(qc);
3936 ata_port_queue_task(ap, ata_pio_task, qc, timeout);
3937 else if (!qc_completed)
3942 * atapi_packet_task - Write CDB bytes to hardware
3943 * @_data: qc in progress
3945 * When device has indicated its readiness to accept
3946 * a CDB, this function is called. Send the CDB.
3947 * If DMA is to be performed, exit immediately.
3948 * Otherwise, we are in polling mode, so poll
3949 * status under operation succeeds or fails.
3952 * Kernel thread context (may sleep)
3954 static void atapi_packet_task(void *_data)
3956 struct ata_queued_cmd *qc = _data;
3957 struct ata_port *ap = qc->ap;
3960 /* sleep-wait for BSY to clear */
3961 DPRINTK("busy wait\n");
3962 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3963 qc->err_mask |= AC_ERR_TIMEOUT;
3967 /* make sure DRQ is set */
3968 status = ata_chk_status(ap);
3969 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3970 qc->err_mask |= AC_ERR_HSM;
3975 DPRINTK("send cdb\n");
3976 WARN_ON(qc->dev->cdb_len < 12);
3978 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3979 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3980 unsigned long flags;
3982 /* Once we're done issuing command and kicking bmdma,
3983 * irq handler takes over. To not lose irq, we need
3984 * to clear NOINTR flag before sending cdb, but
3985 * interrupt handler shouldn't be invoked before we're
3986 * finished. Hence, the following locking.
3988 spin_lock_irqsave(&ap->host_set->lock, flags);
3989 ap->flags &= ~ATA_FLAG_NOINTR;
3990 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3991 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3992 ap->ops->bmdma_start(qc); /* initiate bmdma */
3993 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3995 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3997 /* PIO commands are handled by polling */
3998 ap->hsm_task_state = HSM_ST;
3999 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4005 ata_poll_qc_complete(qc);
4009 * ata_qc_new - Request an available ATA command, for queueing
4010 * @ap: Port associated with device @dev
4011 * @dev: Device from whom we request an available command structure
4017 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4019 struct ata_queued_cmd *qc = NULL;
4022 for (i = 0; i < ATA_MAX_QUEUE; i++)
4023 if (!test_and_set_bit(i, &ap->qactive)) {
4024 qc = ata_qc_from_tag(ap, i);
4035 * ata_qc_new_init - Request an available ATA command, and initialize it
4036 * @ap: Port associated with device @dev
4037 * @dev: Device from whom we request an available command structure
4043 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
4044 struct ata_device *dev)
4046 struct ata_queued_cmd *qc;
4048 qc = ata_qc_new(ap);
4061 * ata_qc_free - free unused ata_queued_cmd
4062 * @qc: Command to complete
4064 * Designed to free unused ata_queued_cmd object
4065 * in case something prevents using it.
4068 * spin_lock_irqsave(host_set lock)
4070 void ata_qc_free(struct ata_queued_cmd *qc)
4072 struct ata_port *ap = qc->ap;
4075 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4079 if (likely(ata_tag_valid(tag))) {
4080 qc->tag = ATA_TAG_POISON;
4081 clear_bit(tag, &ap->qactive);
4085 void __ata_qc_complete(struct ata_queued_cmd *qc)
4087 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4088 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4090 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4093 /* command should be marked inactive atomically with qc completion */
4094 qc->ap->active_tag = ATA_TAG_POISON;
4096 /* atapi: mark qc as inactive to prevent the interrupt handler
4097 * from completing the command twice later, before the error handler
4098 * is called. (when rc != 0 and atapi request sense is needed)
4100 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4102 /* call completion callback */
4103 qc->complete_fn(qc);
4106 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4108 struct ata_port *ap = qc->ap;
4110 switch (qc->tf.protocol) {
4112 case ATA_PROT_ATAPI_DMA:
4115 case ATA_PROT_ATAPI:
4117 if (ap->flags & ATA_FLAG_PIO_DMA)
4130 * ata_qc_issue - issue taskfile to device
4131 * @qc: command to issue to device
4133 * Prepare an ATA command to submission to device.
4134 * This includes mapping the data into a DMA-able
4135 * area, filling in the S/G table, and finally
4136 * writing the taskfile to hardware, starting the command.
4139 * spin_lock_irqsave(host_set lock)
4141 void ata_qc_issue(struct ata_queued_cmd *qc)
4143 struct ata_port *ap = qc->ap;
4145 qc->ap->active_tag = qc->tag;
4146 qc->flags |= ATA_QCFLAG_ACTIVE;
4148 if (ata_should_dma_map(qc)) {
4149 if (qc->flags & ATA_QCFLAG_SG) {
4150 if (ata_sg_setup(qc))
4152 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4153 if (ata_sg_setup_one(qc))
4157 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4160 ap->ops->qc_prep(qc);
4162 qc->err_mask |= ap->ops->qc_issue(qc);
4163 if (unlikely(qc->err_mask))
4168 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4169 qc->err_mask |= AC_ERR_SYSTEM;
4171 ata_qc_complete(qc);
4175 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4176 * @qc: command to issue to device
4178 * Using various libata functions and hooks, this function
4179 * starts an ATA command. ATA commands are grouped into
4180 * classes called "protocols", and issuing each type of protocol
4181 * is slightly different.
4183 * May be used as the qc_issue() entry in ata_port_operations.
4186 * spin_lock_irqsave(host_set lock)
4189 * Zero on success, AC_ERR_* mask on failure
4192 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4194 struct ata_port *ap = qc->ap;
4196 ata_dev_select(ap, qc->dev->devno, 1, 0);
4198 switch (qc->tf.protocol) {
4199 case ATA_PROT_NODATA:
4200 ata_tf_to_host(ap, &qc->tf);
4204 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4205 ap->ops->bmdma_setup(qc); /* set up bmdma */
4206 ap->ops->bmdma_start(qc); /* initiate bmdma */
4209 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4210 ata_qc_set_polling(qc);
4211 ata_tf_to_host(ap, &qc->tf);
4212 ap->hsm_task_state = HSM_ST;
4213 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4216 case ATA_PROT_ATAPI:
4217 ata_qc_set_polling(qc);
4218 ata_tf_to_host(ap, &qc->tf);
4219 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4222 case ATA_PROT_ATAPI_NODATA:
4223 ap->flags |= ATA_FLAG_NOINTR;
4224 ata_tf_to_host(ap, &qc->tf);
4225 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4228 case ATA_PROT_ATAPI_DMA:
4229 ap->flags |= ATA_FLAG_NOINTR;
4230 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4231 ap->ops->bmdma_setup(qc); /* set up bmdma */
4232 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4237 return AC_ERR_SYSTEM;
4244 * ata_host_intr - Handle host interrupt for given (port, task)
4245 * @ap: Port on which interrupt arrived (possibly...)
4246 * @qc: Taskfile currently active in engine
4248 * Handle host interrupt for given queued command. Currently,
4249 * only DMA interrupts are handled. All other commands are
4250 * handled via polling with interrupts disabled (nIEN bit).
4253 * spin_lock_irqsave(host_set lock)
4256 * One if interrupt was handled, zero if not (shared irq).
4259 inline unsigned int ata_host_intr (struct ata_port *ap,
4260 struct ata_queued_cmd *qc)
4262 u8 status, host_stat;
4264 switch (qc->tf.protocol) {
4267 case ATA_PROT_ATAPI_DMA:
4268 case ATA_PROT_ATAPI:
4269 /* check status of DMA engine */
4270 host_stat = ap->ops->bmdma_status(ap);
4271 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4273 /* if it's not our irq... */
4274 if (!(host_stat & ATA_DMA_INTR))
4277 /* before we do anything else, clear DMA-Start bit */
4278 ap->ops->bmdma_stop(qc);
4282 case ATA_PROT_ATAPI_NODATA:
4283 case ATA_PROT_NODATA:
4284 /* check altstatus */
4285 status = ata_altstatus(ap);
4286 if (status & ATA_BUSY)
4289 /* check main status, clearing INTRQ */
4290 status = ata_chk_status(ap);
4291 if (unlikely(status & ATA_BUSY))
4293 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4294 ap->id, qc->tf.protocol, status);
4296 /* ack bmdma irq events */
4297 ap->ops->irq_clear(ap);
4299 /* complete taskfile transaction */
4300 qc->err_mask |= ac_err_mask(status);
4301 ata_qc_complete(qc);
4308 return 1; /* irq handled */
4311 ap->stats.idle_irq++;
4314 if ((ap->stats.idle_irq % 1000) == 0) {
4315 ata_irq_ack(ap, 0); /* debug trap */
4316 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4320 return 0; /* irq not handled */
4324 * ata_interrupt - Default ATA host interrupt handler
4325 * @irq: irq line (unused)
4326 * @dev_instance: pointer to our ata_host_set information structure
4329 * Default interrupt handler for PCI IDE devices. Calls
4330 * ata_host_intr() for each port that is not disabled.
4333 * Obtains host_set lock during operation.
4336 * IRQ_NONE or IRQ_HANDLED.
4339 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4341 struct ata_host_set *host_set = dev_instance;
4343 unsigned int handled = 0;
4344 unsigned long flags;
4346 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4347 spin_lock_irqsave(&host_set->lock, flags);
4349 for (i = 0; i < host_set->n_ports; i++) {
4350 struct ata_port *ap;
4352 ap = host_set->ports[i];
4354 !(ap->flags & (ATA_FLAG_DISABLED | ATA_FLAG_NOINTR))) {
4355 struct ata_queued_cmd *qc;
4357 qc = ata_qc_from_tag(ap, ap->active_tag);
4358 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4359 (qc->flags & ATA_QCFLAG_ACTIVE))
4360 handled |= ata_host_intr(ap, qc);
4364 spin_unlock_irqrestore(&host_set->lock, flags);
4366 return IRQ_RETVAL(handled);
4371 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4372 * without filling any other registers
4374 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4377 struct ata_taskfile tf;
4380 ata_tf_init(ap, &tf, dev->devno);
4383 tf.flags |= ATA_TFLAG_DEVICE;
4384 tf.protocol = ATA_PROT_NODATA;
4386 err = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
4388 printk(KERN_ERR "%s: ata command failed: %d\n",
4394 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4398 if (!ata_try_flush_cache(dev))
4401 if (ata_id_has_flush_ext(dev->id))
4402 cmd = ATA_CMD_FLUSH_EXT;
4404 cmd = ATA_CMD_FLUSH;
4406 return ata_do_simple_cmd(ap, dev, cmd);
4409 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4411 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4414 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4416 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4420 * ata_device_resume - wakeup a previously suspended devices
4421 * @ap: port the device is connected to
4422 * @dev: the device to resume
4424 * Kick the drive back into action, by sending it an idle immediate
4425 * command and making sure its transfer mode matches between drive
4429 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4431 if (ap->flags & ATA_FLAG_SUSPENDED) {
4432 struct ata_device *failed_dev;
4433 ap->flags &= ~ATA_FLAG_SUSPENDED;
4434 while (ata_set_mode(ap, &failed_dev))
4435 ata_dev_disable(ap, failed_dev);
4437 if (!ata_dev_enabled(dev))
4439 if (dev->class == ATA_DEV_ATA)
4440 ata_start_drive(ap, dev);
4446 * ata_device_suspend - prepare a device for suspend
4447 * @ap: port the device is connected to
4448 * @dev: the device to suspend
4450 * Flush the cache on the drive, if appropriate, then issue a
4451 * standbynow command.
4453 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4455 if (!ata_dev_enabled(dev))
4457 if (dev->class == ATA_DEV_ATA)
4458 ata_flush_cache(ap, dev);
4460 if (state.event != PM_EVENT_FREEZE)
4461 ata_standby_drive(ap, dev);
4462 ap->flags |= ATA_FLAG_SUSPENDED;
4467 * ata_port_start - Set port up for dma.
4468 * @ap: Port to initialize
4470 * Called just after data structures for each port are
4471 * initialized. Allocates space for PRD table.
4473 * May be used as the port_start() entry in ata_port_operations.
4476 * Inherited from caller.
4479 int ata_port_start (struct ata_port *ap)
4481 struct device *dev = ap->dev;
4484 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4488 rc = ata_pad_alloc(ap, dev);
4490 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4494 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4501 * ata_port_stop - Undo ata_port_start()
4502 * @ap: Port to shut down
4504 * Frees the PRD table.
4506 * May be used as the port_stop() entry in ata_port_operations.
4509 * Inherited from caller.
4512 void ata_port_stop (struct ata_port *ap)
4514 struct device *dev = ap->dev;
4516 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4517 ata_pad_free(ap, dev);
4520 void ata_host_stop (struct ata_host_set *host_set)
4522 if (host_set->mmio_base)
4523 iounmap(host_set->mmio_base);
4528 * ata_host_remove - Unregister SCSI host structure with upper layers
4529 * @ap: Port to unregister
4530 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4533 * Inherited from caller.
4536 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4538 struct Scsi_Host *sh = ap->host;
4543 scsi_remove_host(sh);
4545 ap->ops->port_stop(ap);
4549 * ata_host_init - Initialize an ata_port structure
4550 * @ap: Structure to initialize
4551 * @host: associated SCSI mid-layer structure
4552 * @host_set: Collection of hosts to which @ap belongs
4553 * @ent: Probe information provided by low-level driver
4554 * @port_no: Port number associated with this ata_port
4556 * Initialize a new ata_port structure, and its associated
4560 * Inherited from caller.
4563 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4564 struct ata_host_set *host_set,
4565 const struct ata_probe_ent *ent, unsigned int port_no)
4571 host->max_channel = 1;
4572 host->unique_id = ata_unique_id++;
4573 host->max_cmd_len = 12;
4575 ap->flags = ATA_FLAG_DISABLED;
4576 ap->id = host->unique_id;
4578 ap->ctl = ATA_DEVCTL_OBS;
4579 ap->host_set = host_set;
4581 ap->port_no = port_no;
4583 ent->legacy_mode ? ent->hard_port_no : port_no;
4584 ap->pio_mask = ent->pio_mask;
4585 ap->mwdma_mask = ent->mwdma_mask;
4586 ap->udma_mask = ent->udma_mask;
4587 ap->flags |= ent->host_flags;
4588 ap->ops = ent->port_ops;
4589 ap->cbl = ATA_CBL_NONE;
4590 ap->sata_spd_limit = UINT_MAX;
4591 ap->active_tag = ATA_TAG_POISON;
4592 ap->last_ctl = 0xFF;
4594 INIT_WORK(&ap->port_task, NULL, NULL);
4595 INIT_LIST_HEAD(&ap->eh_done_q);
4597 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4598 struct ata_device *dev = &ap->device[i];
4600 dev->pio_mask = UINT_MAX;
4601 dev->mwdma_mask = UINT_MAX;
4602 dev->udma_mask = UINT_MAX;
4606 ap->stats.unhandled_irq = 1;
4607 ap->stats.idle_irq = 1;
4610 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4614 * ata_host_add - Attach low-level ATA driver to system
4615 * @ent: Information provided by low-level driver
4616 * @host_set: Collections of ports to which we add
4617 * @port_no: Port number associated with this host
4619 * Attach low-level ATA driver to system.
4622 * PCI/etc. bus probe sem.
4625 * New ata_port on success, for NULL on error.
4628 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4629 struct ata_host_set *host_set,
4630 unsigned int port_no)
4632 struct Scsi_Host *host;
4633 struct ata_port *ap;
4638 if (!ent->port_ops->probe_reset &&
4639 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4640 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4645 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4649 host->transportt = &ata_scsi_transport_template;
4651 ap = ata_shost_to_port(host);
4653 ata_host_init(ap, host, host_set, ent, port_no);
4655 rc = ap->ops->port_start(ap);
4662 scsi_host_put(host);
4667 * ata_device_add - Register hardware device with ATA and SCSI layers
4668 * @ent: Probe information describing hardware device to be registered
4670 * This function processes the information provided in the probe
4671 * information struct @ent, allocates the necessary ATA and SCSI
4672 * host information structures, initializes them, and registers
4673 * everything with requisite kernel subsystems.
4675 * This function requests irqs, probes the ATA bus, and probes
4679 * PCI/etc. bus probe sem.
4682 * Number of ports registered. Zero on error (no ports registered).
4685 int ata_device_add(const struct ata_probe_ent *ent)
4687 unsigned int count = 0, i;
4688 struct device *dev = ent->dev;
4689 struct ata_host_set *host_set;
4692 /* alloc a container for our list of ATA ports (buses) */
4693 host_set = kzalloc(sizeof(struct ata_host_set) +
4694 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4697 spin_lock_init(&host_set->lock);
4699 host_set->dev = dev;
4700 host_set->n_ports = ent->n_ports;
4701 host_set->irq = ent->irq;
4702 host_set->mmio_base = ent->mmio_base;
4703 host_set->private_data = ent->private_data;
4704 host_set->ops = ent->port_ops;
4705 host_set->flags = ent->host_set_flags;
4707 /* register each port bound to this device */
4708 for (i = 0; i < ent->n_ports; i++) {
4709 struct ata_port *ap;
4710 unsigned long xfer_mode_mask;
4712 ap = ata_host_add(ent, host_set, i);
4716 host_set->ports[i] = ap;
4717 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4718 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4719 (ap->pio_mask << ATA_SHIFT_PIO);
4721 /* print per-port info to dmesg */
4722 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4723 "bmdma 0x%lX irq %lu\n",
4725 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4726 ata_mode_string(xfer_mode_mask),
4727 ap->ioaddr.cmd_addr,
4728 ap->ioaddr.ctl_addr,
4729 ap->ioaddr.bmdma_addr,
4733 host_set->ops->irq_clear(ap);
4740 /* obtain irq, that is shared between channels */
4741 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4742 DRV_NAME, host_set))
4745 /* perform each probe synchronously */
4746 DPRINTK("probe begin\n");
4747 for (i = 0; i < count; i++) {
4748 struct ata_port *ap;
4751 ap = host_set->ports[i];
4753 DPRINTK("ata%u: bus probe begin\n", ap->id);
4754 rc = ata_bus_probe(ap);
4755 DPRINTK("ata%u: bus probe end\n", ap->id);
4758 /* FIXME: do something useful here?
4759 * Current libata behavior will
4760 * tear down everything when
4761 * the module is removed
4762 * or the h/w is unplugged.
4766 rc = scsi_add_host(ap->host, dev);
4768 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4770 /* FIXME: do something useful here */
4771 /* FIXME: handle unconditional calls to
4772 * scsi_scan_host and ata_host_remove, below,
4778 /* probes are done, now scan each port's disk(s) */
4779 DPRINTK("host probe begin\n");
4780 for (i = 0; i < count; i++) {
4781 struct ata_port *ap = host_set->ports[i];
4783 ata_scsi_scan_host(ap);
4786 dev_set_drvdata(dev, host_set);
4788 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4789 return ent->n_ports; /* success */
4792 for (i = 0; i < count; i++) {
4793 ata_host_remove(host_set->ports[i], 1);
4794 scsi_host_put(host_set->ports[i]->host);
4798 VPRINTK("EXIT, returning 0\n");
4803 * ata_host_set_remove - PCI layer callback for device removal
4804 * @host_set: ATA host set that was removed
4806 * Unregister all objects associated with this host set. Free those
4810 * Inherited from calling layer (may sleep).
4813 void ata_host_set_remove(struct ata_host_set *host_set)
4815 struct ata_port *ap;
4818 for (i = 0; i < host_set->n_ports; i++) {
4819 ap = host_set->ports[i];
4820 scsi_remove_host(ap->host);
4823 free_irq(host_set->irq, host_set);
4825 for (i = 0; i < host_set->n_ports; i++) {
4826 ap = host_set->ports[i];
4828 ata_scsi_release(ap->host);
4830 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4831 struct ata_ioports *ioaddr = &ap->ioaddr;
4833 if (ioaddr->cmd_addr == 0x1f0)
4834 release_region(0x1f0, 8);
4835 else if (ioaddr->cmd_addr == 0x170)
4836 release_region(0x170, 8);
4839 scsi_host_put(ap->host);
4842 if (host_set->ops->host_stop)
4843 host_set->ops->host_stop(host_set);
4849 * ata_scsi_release - SCSI layer callback hook for host unload
4850 * @host: libata host to be unloaded
4852 * Performs all duties necessary to shut down a libata port...
4853 * Kill port kthread, disable port, and release resources.
4856 * Inherited from SCSI layer.
4862 int ata_scsi_release(struct Scsi_Host *host)
4864 struct ata_port *ap = ata_shost_to_port(host);
4868 ap->ops->port_disable(ap);
4869 ata_host_remove(ap, 0);
4876 * ata_std_ports - initialize ioaddr with standard port offsets.
4877 * @ioaddr: IO address structure to be initialized
4879 * Utility function which initializes data_addr, error_addr,
4880 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4881 * device_addr, status_addr, and command_addr to standard offsets
4882 * relative to cmd_addr.
4884 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4887 void ata_std_ports(struct ata_ioports *ioaddr)
4889 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4890 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4891 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4892 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4893 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4894 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4895 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4896 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4897 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4898 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4904 void ata_pci_host_stop (struct ata_host_set *host_set)
4906 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4908 pci_iounmap(pdev, host_set->mmio_base);
4912 * ata_pci_remove_one - PCI layer callback for device removal
4913 * @pdev: PCI device that was removed
4915 * PCI layer indicates to libata via this hook that
4916 * hot-unplug or module unload event has occurred.
4917 * Handle this by unregistering all objects associated
4918 * with this PCI device. Free those objects. Then finally
4919 * release PCI resources and disable device.
4922 * Inherited from PCI layer (may sleep).
4925 void ata_pci_remove_one (struct pci_dev *pdev)
4927 struct device *dev = pci_dev_to_dev(pdev);
4928 struct ata_host_set *host_set = dev_get_drvdata(dev);
4930 ata_host_set_remove(host_set);
4931 pci_release_regions(pdev);
4932 pci_disable_device(pdev);
4933 dev_set_drvdata(dev, NULL);
4936 /* move to PCI subsystem */
4937 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4939 unsigned long tmp = 0;
4941 switch (bits->width) {
4944 pci_read_config_byte(pdev, bits->reg, &tmp8);
4950 pci_read_config_word(pdev, bits->reg, &tmp16);
4956 pci_read_config_dword(pdev, bits->reg, &tmp32);
4967 return (tmp == bits->val) ? 1 : 0;
4970 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4972 pci_save_state(pdev);
4973 pci_disable_device(pdev);
4974 pci_set_power_state(pdev, PCI_D3hot);
4978 int ata_pci_device_resume(struct pci_dev *pdev)
4980 pci_set_power_state(pdev, PCI_D0);
4981 pci_restore_state(pdev);
4982 pci_enable_device(pdev);
4983 pci_set_master(pdev);
4986 #endif /* CONFIG_PCI */
4989 static int __init ata_init(void)
4991 ata_wq = create_workqueue("ata");
4995 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4999 static void __exit ata_exit(void)
5001 destroy_workqueue(ata_wq);
5004 module_init(ata_init);
5005 module_exit(ata_exit);
5007 static unsigned long ratelimit_time;
5008 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5010 int ata_ratelimit(void)
5013 unsigned long flags;
5015 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5017 if (time_after(jiffies, ratelimit_time)) {
5019 ratelimit_time = jiffies + (HZ/5);
5023 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5029 * ata_wait_register - wait until register value changes
5030 * @reg: IO-mapped register
5031 * @mask: Mask to apply to read register value
5032 * @val: Wait condition
5033 * @interval_msec: polling interval in milliseconds
5034 * @timeout_msec: timeout in milliseconds
5036 * Waiting for some bits of register to change is a common
5037 * operation for ATA controllers. This function reads 32bit LE
5038 * IO-mapped register @reg and tests for the following condition.
5040 * (*@reg & mask) != val
5042 * If the condition is met, it returns; otherwise, the process is
5043 * repeated after @interval_msec until timeout.
5046 * Kernel thread context (may sleep)
5049 * The final register value.
5051 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5052 unsigned long interval_msec,
5053 unsigned long timeout_msec)
5055 unsigned long timeout;
5058 tmp = ioread32(reg);
5060 /* Calculate timeout _after_ the first read to make sure
5061 * preceding writes reach the controller before starting to
5062 * eat away the timeout.
5064 timeout = jiffies + (timeout_msec * HZ) / 1000;
5066 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5067 msleep(interval_msec);
5068 tmp = ioread32(reg);
5075 * libata is essentially a library of internal helper functions for
5076 * low-level ATA host controller drivers. As such, the API/ABI is
5077 * likely to change as new drivers are added and updated.
5078 * Do not depend on ABI/API stability.
5081 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5082 EXPORT_SYMBOL_GPL(ata_std_ports);
5083 EXPORT_SYMBOL_GPL(ata_device_add);
5084 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5085 EXPORT_SYMBOL_GPL(ata_sg_init);
5086 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5087 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5088 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5089 EXPORT_SYMBOL_GPL(ata_tf_load);
5090 EXPORT_SYMBOL_GPL(ata_tf_read);
5091 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5092 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5093 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5094 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5095 EXPORT_SYMBOL_GPL(ata_check_status);
5096 EXPORT_SYMBOL_GPL(ata_altstatus);
5097 EXPORT_SYMBOL_GPL(ata_exec_command);
5098 EXPORT_SYMBOL_GPL(ata_port_start);
5099 EXPORT_SYMBOL_GPL(ata_port_stop);
5100 EXPORT_SYMBOL_GPL(ata_host_stop);
5101 EXPORT_SYMBOL_GPL(ata_interrupt);
5102 EXPORT_SYMBOL_GPL(ata_qc_prep);
5103 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5104 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5105 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5106 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5107 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5108 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5109 EXPORT_SYMBOL_GPL(ata_port_probe);
5110 EXPORT_SYMBOL_GPL(sata_set_spd);
5111 EXPORT_SYMBOL_GPL(sata_phy_reset);
5112 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5113 EXPORT_SYMBOL_GPL(ata_bus_reset);
5114 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5115 EXPORT_SYMBOL_GPL(ata_std_softreset);
5116 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5117 EXPORT_SYMBOL_GPL(ata_std_postreset);
5118 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5119 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5120 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5121 EXPORT_SYMBOL_GPL(ata_dev_classify);
5122 EXPORT_SYMBOL_GPL(ata_dev_pair);
5123 EXPORT_SYMBOL_GPL(ata_port_disable);
5124 EXPORT_SYMBOL_GPL(ata_ratelimit);
5125 EXPORT_SYMBOL_GPL(ata_wait_register);
5126 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5127 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5128 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5129 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5130 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5131 EXPORT_SYMBOL_GPL(ata_scsi_release);
5132 EXPORT_SYMBOL_GPL(ata_host_intr);
5133 EXPORT_SYMBOL_GPL(ata_id_string);
5134 EXPORT_SYMBOL_GPL(ata_id_c_string);
5135 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5137 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5138 EXPORT_SYMBOL_GPL(ata_timing_compute);
5139 EXPORT_SYMBOL_GPL(ata_timing_merge);
5142 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5143 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5144 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5145 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5146 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5147 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5148 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5149 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5150 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5151 #endif /* CONFIG_PCI */
5153 EXPORT_SYMBOL_GPL(ata_device_suspend);
5154 EXPORT_SYMBOL_GPL(ata_device_resume);
5155 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5156 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5158 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5159 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5160 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);