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);
66 static void ata_set_mode(struct ata_port *ap);
67 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static void ata_pio_error(struct ata_port *ap);
69 static unsigned int ata_dev_xfermask(struct ata_port *ap,
70 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_named(fua, libata_fua, int, 0444);
81 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
83 MODULE_AUTHOR("Jeff Garzik");
84 MODULE_DESCRIPTION("Library module for ATA devices");
85 MODULE_LICENSE("GPL");
86 MODULE_VERSION(DRV_VERSION);
90 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
91 * @tf: Taskfile to convert
92 * @fis: Buffer into which data will output
93 * @pmp: Port multiplier port
95 * Converts a standard ATA taskfile to a Serial ATA
96 * FIS structure (Register - Host to Device).
99 * Inherited from caller.
102 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
104 fis[0] = 0x27; /* Register - Host to Device FIS */
105 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
106 bit 7 indicates Command FIS */
107 fis[2] = tf->command;
108 fis[3] = tf->feature;
115 fis[8] = tf->hob_lbal;
116 fis[9] = tf->hob_lbam;
117 fis[10] = tf->hob_lbah;
118 fis[11] = tf->hob_feature;
121 fis[13] = tf->hob_nsect;
132 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
133 * @fis: Buffer from which data will be input
134 * @tf: Taskfile to output
136 * Converts a serial ATA FIS structure to a standard ATA taskfile.
139 * Inherited from caller.
142 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
144 tf->command = fis[2]; /* status */
145 tf->feature = fis[3]; /* error */
152 tf->hob_lbal = fis[8];
153 tf->hob_lbam = fis[9];
154 tf->hob_lbah = fis[10];
157 tf->hob_nsect = fis[13];
160 static const u8 ata_rw_cmds[] = {
164 ATA_CMD_READ_MULTI_EXT,
165 ATA_CMD_WRITE_MULTI_EXT,
169 ATA_CMD_WRITE_MULTI_FUA_EXT,
173 ATA_CMD_PIO_READ_EXT,
174 ATA_CMD_PIO_WRITE_EXT,
187 ATA_CMD_WRITE_FUA_EXT
191 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
192 * @qc: command to examine and configure
194 * Examine the device configuration and tf->flags to calculate
195 * the proper read/write commands and protocol to use.
200 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
202 struct ata_taskfile *tf = &qc->tf;
203 struct ata_device *dev = qc->dev;
206 int index, fua, lba48, write;
208 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
209 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
210 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
212 if (dev->flags & ATA_DFLAG_PIO) {
213 tf->protocol = ATA_PROT_PIO;
214 index = dev->multi_count ? 0 : 8;
215 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
216 /* Unable to use DMA due to host limitation */
217 tf->protocol = ATA_PROT_PIO;
218 index = dev->multi_count ? 0 : 8;
220 tf->protocol = ATA_PROT_DMA;
224 cmd = ata_rw_cmds[index + fua + lba48 + write];
233 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
234 * @pio_mask: pio_mask
235 * @mwdma_mask: mwdma_mask
236 * @udma_mask: udma_mask
238 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
239 * unsigned int xfer_mask.
247 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
248 unsigned int mwdma_mask,
249 unsigned int udma_mask)
251 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
252 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
253 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
256 static const struct ata_xfer_ent {
257 unsigned int shift, bits;
260 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
261 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
262 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
267 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
268 * @xfer_mask: xfer_mask of interest
270 * Return matching XFER_* value for @xfer_mask. Only the highest
271 * bit of @xfer_mask is considered.
277 * Matching XFER_* value, 0 if no match found.
279 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
281 int highbit = fls(xfer_mask) - 1;
282 const struct ata_xfer_ent *ent;
284 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
285 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
286 return ent->base + highbit - ent->shift;
291 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
292 * @xfer_mode: XFER_* of interest
294 * Return matching xfer_mask for @xfer_mode.
300 * Matching xfer_mask, 0 if no match found.
302 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
304 const struct ata_xfer_ent *ent;
306 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
307 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
308 return 1 << (ent->shift + xfer_mode - ent->base);
313 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
314 * @xfer_mode: XFER_* of interest
316 * Return matching xfer_shift for @xfer_mode.
322 * Matching xfer_shift, -1 if no match found.
324 static int ata_xfer_mode2shift(unsigned int xfer_mode)
326 const struct ata_xfer_ent *ent;
328 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
329 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
335 * ata_mode_string - convert xfer_mask to string
336 * @xfer_mask: mask of bits supported; only highest bit counts.
338 * Determine string which represents the highest speed
339 * (highest bit in @modemask).
345 * Constant C string representing highest speed listed in
346 * @mode_mask, or the constant C string "<n/a>".
348 static const char *ata_mode_string(unsigned int xfer_mask)
350 static const char * const xfer_mode_str[] = {
370 highbit = fls(xfer_mask) - 1;
371 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
372 return xfer_mode_str[highbit];
377 * ata_pio_devchk - PATA device presence detection
378 * @ap: ATA channel to examine
379 * @device: Device to examine (starting at zero)
381 * This technique was originally described in
382 * Hale Landis's ATADRVR (www.ata-atapi.com), and
383 * later found its way into the ATA/ATAPI spec.
385 * Write a pattern to the ATA shadow registers,
386 * and if a device is present, it will respond by
387 * correctly storing and echoing back the
388 * ATA shadow register contents.
394 static unsigned int ata_pio_devchk(struct ata_port *ap,
397 struct ata_ioports *ioaddr = &ap->ioaddr;
400 ap->ops->dev_select(ap, device);
402 outb(0x55, ioaddr->nsect_addr);
403 outb(0xaa, ioaddr->lbal_addr);
405 outb(0xaa, ioaddr->nsect_addr);
406 outb(0x55, ioaddr->lbal_addr);
408 outb(0x55, ioaddr->nsect_addr);
409 outb(0xaa, ioaddr->lbal_addr);
411 nsect = inb(ioaddr->nsect_addr);
412 lbal = inb(ioaddr->lbal_addr);
414 if ((nsect == 0x55) && (lbal == 0xaa))
415 return 1; /* we found a device */
417 return 0; /* nothing found */
421 * ata_mmio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_mmio_devchk(struct ata_port *ap,
441 struct ata_ioports *ioaddr = &ap->ioaddr;
444 ap->ops->dev_select(ap, device);
446 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
447 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
449 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
450 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
452 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
453 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
455 nsect = readb((void __iomem *) ioaddr->nsect_addr);
456 lbal = readb((void __iomem *) ioaddr->lbal_addr);
458 if ((nsect == 0x55) && (lbal == 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * Dispatch ATA device presence detection, depending
470 * on whether we are using PIO or MMIO to talk to the
471 * ATA shadow registers.
477 static unsigned int ata_devchk(struct ata_port *ap,
480 if (ap->flags & ATA_FLAG_MMIO)
481 return ata_mmio_devchk(ap, device);
482 return ata_pio_devchk(ap, device);
486 * ata_dev_classify - determine device type based on ATA-spec signature
487 * @tf: ATA taskfile register set for device to be identified
489 * Determine from taskfile register contents whether a device is
490 * ATA or ATAPI, as per "Signature and persistence" section
491 * of ATA/PI spec (volume 1, sect 5.14).
497 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
498 * the event of failure.
501 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
503 /* Apple's open source Darwin code hints that some devices only
504 * put a proper signature into the LBA mid/high registers,
505 * So, we only check those. It's sufficient for uniqueness.
508 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
509 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
510 DPRINTK("found ATA device by sig\n");
514 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
515 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
516 DPRINTK("found ATAPI device by sig\n");
517 return ATA_DEV_ATAPI;
520 DPRINTK("unknown device\n");
521 return ATA_DEV_UNKNOWN;
525 * ata_dev_try_classify - Parse returned ATA device signature
526 * @ap: ATA channel to examine
527 * @device: Device to examine (starting at zero)
528 * @r_err: Value of error register on completion
530 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
531 * an ATA/ATAPI-defined set of values is placed in the ATA
532 * shadow registers, indicating the results of device detection
535 * Select the ATA device, and read the values from the ATA shadow
536 * registers. Then parse according to the Error register value,
537 * and the spec-defined values examined by ata_dev_classify().
543 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
547 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
549 struct ata_taskfile tf;
553 ap->ops->dev_select(ap, device);
555 memset(&tf, 0, sizeof(tf));
557 ap->ops->tf_read(ap, &tf);
562 /* see if device passed diags */
565 else if ((device == 0) && (err == 0x81))
570 /* determine if device is ATA or ATAPI */
571 class = ata_dev_classify(&tf);
573 if (class == ATA_DEV_UNKNOWN)
575 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
581 * ata_id_string - Convert IDENTIFY DEVICE page into string
582 * @id: IDENTIFY DEVICE results we will examine
583 * @s: string into which data is output
584 * @ofs: offset into identify device page
585 * @len: length of string to return. must be an even number.
587 * The strings in the IDENTIFY DEVICE page are broken up into
588 * 16-bit chunks. Run through the string, and output each
589 * 8-bit chunk linearly, regardless of platform.
595 void ata_id_string(const u16 *id, unsigned char *s,
596 unsigned int ofs, unsigned int len)
615 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
616 * @id: IDENTIFY DEVICE results we will examine
617 * @s: string into which data is output
618 * @ofs: offset into identify device page
619 * @len: length of string to return. must be an odd number.
621 * This function is identical to ata_id_string except that it
622 * trims trailing spaces and terminates the resulting string with
623 * null. @len must be actual maximum length (even number) + 1.
628 void ata_id_c_string(const u16 *id, unsigned char *s,
629 unsigned int ofs, unsigned int len)
635 ata_id_string(id, s, ofs, len - 1);
637 p = s + strnlen(s, len - 1);
638 while (p > s && p[-1] == ' ')
643 static u64 ata_id_n_sectors(const u16 *id)
645 if (ata_id_has_lba(id)) {
646 if (ata_id_has_lba48(id))
647 return ata_id_u64(id, 100);
649 return ata_id_u32(id, 60);
651 if (ata_id_current_chs_valid(id))
652 return ata_id_u32(id, 57);
654 return id[1] * id[3] * id[6];
659 * ata_noop_dev_select - Select device 0/1 on ATA bus
660 * @ap: ATA channel to manipulate
661 * @device: ATA device (numbered from zero) to select
663 * This function performs no actual function.
665 * May be used as the dev_select() entry in ata_port_operations.
670 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
676 * ata_std_dev_select - Select device 0/1 on ATA bus
677 * @ap: ATA channel to manipulate
678 * @device: ATA device (numbered from zero) to select
680 * Use the method defined in the ATA specification to
681 * make either device 0, or device 1, active on the
682 * ATA channel. Works with both PIO and MMIO.
684 * May be used as the dev_select() entry in ata_port_operations.
690 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
695 tmp = ATA_DEVICE_OBS;
697 tmp = ATA_DEVICE_OBS | ATA_DEV1;
699 if (ap->flags & ATA_FLAG_MMIO) {
700 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
702 outb(tmp, ap->ioaddr.device_addr);
704 ata_pause(ap); /* needed; also flushes, for mmio */
708 * ata_dev_select - Select device 0/1 on ATA bus
709 * @ap: ATA channel to manipulate
710 * @device: ATA device (numbered from zero) to select
711 * @wait: non-zero to wait for Status register BSY bit to clear
712 * @can_sleep: non-zero if context allows sleeping
714 * Use the method defined in the ATA specification to
715 * make either device 0, or device 1, active on the
718 * This is a high-level version of ata_std_dev_select(),
719 * which additionally provides the services of inserting
720 * the proper pauses and status polling, where needed.
726 void ata_dev_select(struct ata_port *ap, unsigned int device,
727 unsigned int wait, unsigned int can_sleep)
729 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
730 ap->id, device, wait);
735 ap->ops->dev_select(ap, device);
738 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
745 * ata_dump_id - IDENTIFY DEVICE info debugging output
746 * @id: IDENTIFY DEVICE page to dump
748 * Dump selected 16-bit words from the given IDENTIFY DEVICE
755 static inline void ata_dump_id(const u16 *id)
757 DPRINTK("49==0x%04x "
767 DPRINTK("80==0x%04x "
777 DPRINTK("88==0x%04x "
784 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
785 * @id: IDENTIFY data to compute xfer mask from
787 * Compute the xfermask for this device. This is not as trivial
788 * as it seems if we must consider early devices correctly.
790 * FIXME: pre IDE drive timing (do we care ?).
798 static unsigned int ata_id_xfermask(const u16 *id)
800 unsigned int pio_mask, mwdma_mask, udma_mask;
802 /* Usual case. Word 53 indicates word 64 is valid */
803 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
804 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
808 /* If word 64 isn't valid then Word 51 high byte holds
809 * the PIO timing number for the maximum. Turn it into
812 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
814 /* But wait.. there's more. Design your standards by
815 * committee and you too can get a free iordy field to
816 * process. However its the speeds not the modes that
817 * are supported... Note drivers using the timing API
818 * will get this right anyway
822 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
825 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
826 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
828 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
832 * ata_port_queue_task - Queue port_task
833 * @ap: The ata_port to queue port_task for
835 * Schedule @fn(@data) for execution after @delay jiffies using
836 * port_task. There is one port_task per port and it's the
837 * user(low level driver)'s responsibility to make sure that only
838 * one task is active at any given time.
840 * libata core layer takes care of synchronization between
841 * port_task and EH. ata_port_queue_task() may be ignored for EH
845 * Inherited from caller.
847 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
852 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
855 PREPARE_WORK(&ap->port_task, fn, data);
858 rc = queue_work(ata_wq, &ap->port_task);
860 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
862 /* rc == 0 means that another user is using port task */
867 * ata_port_flush_task - Flush port_task
868 * @ap: The ata_port to flush port_task for
870 * After this function completes, port_task is guranteed not to
871 * be running or scheduled.
874 * Kernel thread context (may sleep)
876 void ata_port_flush_task(struct ata_port *ap)
882 spin_lock_irqsave(&ap->host_set->lock, flags);
883 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
884 spin_unlock_irqrestore(&ap->host_set->lock, flags);
886 DPRINTK("flush #1\n");
887 flush_workqueue(ata_wq);
890 * At this point, if a task is running, it's guaranteed to see
891 * the FLUSH flag; thus, it will never queue pio tasks again.
894 if (!cancel_delayed_work(&ap->port_task)) {
895 DPRINTK("flush #2\n");
896 flush_workqueue(ata_wq);
899 spin_lock_irqsave(&ap->host_set->lock, flags);
900 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
901 spin_unlock_irqrestore(&ap->host_set->lock, flags);
906 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
908 struct completion *waiting = qc->private_data;
910 qc->ap->ops->tf_read(qc->ap, &qc->tf);
915 * ata_exec_internal - execute libata internal command
916 * @ap: Port to which the command is sent
917 * @dev: Device to which the command is sent
918 * @tf: Taskfile registers for the command and the result
919 * @dma_dir: Data tranfer direction of the command
920 * @buf: Data buffer of the command
921 * @buflen: Length of data buffer
923 * Executes libata internal command with timeout. @tf contains
924 * command on entry and result on return. Timeout and error
925 * conditions are reported via return value. No recovery action
926 * is taken after a command times out. It's caller's duty to
927 * clean up after timeout.
930 * None. Should be called with kernel context, might sleep.
934 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
935 struct ata_taskfile *tf,
936 int dma_dir, void *buf, unsigned int buflen)
938 u8 command = tf->command;
939 struct ata_queued_cmd *qc;
940 DECLARE_COMPLETION(wait);
942 unsigned int err_mask;
944 spin_lock_irqsave(&ap->host_set->lock, flags);
946 qc = ata_qc_new_init(ap, dev);
950 qc->dma_dir = dma_dir;
951 if (dma_dir != DMA_NONE) {
952 ata_sg_init_one(qc, buf, buflen);
953 qc->nsect = buflen / ATA_SECT_SIZE;
956 qc->private_data = &wait;
957 qc->complete_fn = ata_qc_complete_internal;
959 qc->err_mask = ata_qc_issue(qc);
963 spin_unlock_irqrestore(&ap->host_set->lock, flags);
965 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
966 ata_port_flush_task(ap);
968 spin_lock_irqsave(&ap->host_set->lock, flags);
970 /* We're racing with irq here. If we lose, the
971 * following test prevents us from completing the qc
972 * again. If completion irq occurs after here but
973 * before the caller cleans up, it will result in a
974 * spurious interrupt. We can live with that.
976 if (qc->flags & ATA_QCFLAG_ACTIVE) {
977 qc->err_mask = AC_ERR_TIMEOUT;
979 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
983 spin_unlock_irqrestore(&ap->host_set->lock, flags);
987 err_mask = qc->err_mask;
995 * ata_pio_need_iordy - check if iordy needed
998 * Check if the current speed of the device requires IORDY. Used
999 * by various controllers for chip configuration.
1002 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1005 int speed = adev->pio_mode - XFER_PIO_0;
1012 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1014 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1015 pio = adev->id[ATA_ID_EIDE_PIO];
1016 /* Is the speed faster than the drive allows non IORDY ? */
1018 /* This is cycle times not frequency - watch the logic! */
1019 if (pio > 240) /* PIO2 is 240nS per cycle */
1028 * ata_dev_read_id - Read ID data from the specified device
1029 * @ap: port on which target device resides
1030 * @dev: target device
1031 * @p_class: pointer to class of the target device (may be changed)
1032 * @post_reset: is this read ID post-reset?
1033 * @p_id: read IDENTIFY page (newly allocated)
1035 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1036 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1037 * devices. This function also takes care of EDD signature
1038 * misreporting (to be removed once EDD support is gone) and
1039 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1042 * Kernel thread context (may sleep)
1045 * 0 on success, -errno otherwise.
1047 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1048 unsigned int *p_class, int post_reset, u16 **p_id)
1050 unsigned int class = *p_class;
1051 unsigned int using_edd;
1052 struct ata_taskfile tf;
1053 unsigned int err_mask = 0;
1058 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1060 if (ap->ops->probe_reset ||
1061 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
1066 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1068 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1071 reason = "out of memory";
1076 ata_tf_init(ap, &tf, dev->devno);
1080 tf.command = ATA_CMD_ID_ATA;
1083 tf.command = ATA_CMD_ID_ATAPI;
1087 reason = "unsupported class";
1091 tf.protocol = ATA_PROT_PIO;
1093 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1094 id, sizeof(id[0]) * ATA_ID_WORDS);
1098 reason = "I/O error";
1100 if (err_mask & ~AC_ERR_DEV)
1104 * arg! EDD works for all test cases, but seems to return
1105 * the ATA signature for some ATAPI devices. Until the
1106 * reason for this is found and fixed, we fix up the mess
1107 * here. If IDENTIFY DEVICE returns command aborted
1108 * (as ATAPI devices do), then we issue an
1109 * IDENTIFY PACKET DEVICE.
1111 * ATA software reset (SRST, the default) does not appear
1112 * to have this problem.
1114 if ((using_edd) && (class == ATA_DEV_ATA)) {
1115 u8 err = tf.feature;
1116 if (err & ATA_ABORTED) {
1117 class = ATA_DEV_ATAPI;
1124 swap_buf_le16(id, ATA_ID_WORDS);
1127 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1129 reason = "device reports illegal type";
1133 if (post_reset && class == ATA_DEV_ATA) {
1135 * The exact sequence expected by certain pre-ATA4 drives is:
1138 * INITIALIZE DEVICE PARAMETERS
1140 * Some drives were very specific about that exact sequence.
1142 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1143 err_mask = ata_dev_init_params(ap, dev);
1146 reason = "INIT_DEV_PARAMS failed";
1150 /* current CHS translation info (id[53-58]) might be
1151 * changed. reread the identify device info.
1163 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1164 ap->id, dev->devno, reason);
1169 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1170 struct ata_device *dev)
1172 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1176 * ata_dev_configure - Configure the specified ATA/ATAPI device
1177 * @ap: Port on which target device resides
1178 * @dev: Target device to configure
1179 * @print_info: Enable device info printout
1181 * Configure @dev according to @dev->id. Generic and low-level
1182 * driver specific fixups are also applied.
1185 * Kernel thread context (may sleep)
1188 * 0 on success, -errno otherwise
1190 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1193 const u16 *id = dev->id;
1194 unsigned int xfer_mask;
1197 if (!ata_dev_present(dev)) {
1198 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1199 ap->id, dev->devno);
1203 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1205 /* print device capabilities */
1207 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1208 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1209 ap->id, dev->devno, id[49], id[82], id[83],
1210 id[84], id[85], id[86], id[87], id[88]);
1212 /* initialize to-be-configured parameters */
1214 dev->max_sectors = 0;
1222 * common ATA, ATAPI feature tests
1225 /* find max transfer mode; for printk only */
1226 xfer_mask = ata_id_xfermask(id);
1230 /* ATA-specific feature tests */
1231 if (dev->class == ATA_DEV_ATA) {
1232 dev->n_sectors = ata_id_n_sectors(id);
1234 if (ata_id_has_lba(id)) {
1235 const char *lba_desc;
1238 dev->flags |= ATA_DFLAG_LBA;
1239 if (ata_id_has_lba48(id)) {
1240 dev->flags |= ATA_DFLAG_LBA48;
1244 /* print device info to dmesg */
1246 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1247 "max %s, %Lu sectors: %s\n",
1249 ata_id_major_version(id),
1250 ata_mode_string(xfer_mask),
1251 (unsigned long long)dev->n_sectors,
1256 /* Default translation */
1257 dev->cylinders = id[1];
1259 dev->sectors = id[6];
1261 if (ata_id_current_chs_valid(id)) {
1262 /* Current CHS translation is valid. */
1263 dev->cylinders = id[54];
1264 dev->heads = id[55];
1265 dev->sectors = id[56];
1268 /* print device info to dmesg */
1270 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1271 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1273 ata_id_major_version(id),
1274 ata_mode_string(xfer_mask),
1275 (unsigned long long)dev->n_sectors,
1276 dev->cylinders, dev->heads, dev->sectors);
1279 if (dev->id[59] & 0x100) {
1280 dev->multi_count = dev->id[59] & 0xff;
1281 DPRINTK("ata%u: dev %u multi count %u\n",
1282 ap->id, device, dev->multi_count);
1287 /* ATAPI-specific feature tests */
1288 else if (dev->class == ATA_DEV_ATAPI) {
1289 rc = atapi_cdb_len(id);
1290 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1291 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1295 dev->cdb_len = (unsigned int) rc;
1297 if (ata_id_cdb_intr(dev->id))
1298 dev->flags |= ATA_DFLAG_CDB_INTR;
1300 /* print device info to dmesg */
1302 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1303 ap->id, dev->devno, ata_mode_string(xfer_mask));
1306 ap->host->max_cmd_len = 0;
1307 for (i = 0; i < ATA_MAX_DEVICES; i++)
1308 ap->host->max_cmd_len = max_t(unsigned int,
1309 ap->host->max_cmd_len,
1310 ap->device[i].cdb_len);
1312 /* limit bridge transfers to udma5, 200 sectors */
1313 if (ata_dev_knobble(ap, dev)) {
1315 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1316 ap->id, dev->devno);
1317 ap->udma_mask &= ATA_UDMA5;
1318 dev->max_sectors = ATA_MAX_SECTORS;
1321 if (ap->ops->dev_config)
1322 ap->ops->dev_config(ap, dev);
1324 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1328 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1329 ap->id, dev->devno);
1330 DPRINTK("EXIT, err\n");
1335 * ata_bus_probe - Reset and probe ATA bus
1338 * Master ATA bus probing function. Initiates a hardware-dependent
1339 * bus reset, then attempts to identify any devices found on
1343 * PCI/etc. bus probe sem.
1346 * Zero on success, non-zero on error.
1349 static int ata_bus_probe(struct ata_port *ap)
1351 unsigned int classes[ATA_MAX_DEVICES];
1352 unsigned int i, rc, found = 0;
1356 /* reset and determine device classes */
1357 for (i = 0; i < ATA_MAX_DEVICES; i++)
1358 classes[i] = ATA_DEV_UNKNOWN;
1360 if (ap->ops->probe_reset) {
1361 rc = ap->ops->probe_reset(ap, classes);
1363 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1367 ap->ops->phy_reset(ap);
1369 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1370 for (i = 0; i < ATA_MAX_DEVICES; i++)
1371 classes[i] = ap->device[i].class;
1376 for (i = 0; i < ATA_MAX_DEVICES; i++)
1377 if (classes[i] == ATA_DEV_UNKNOWN)
1378 classes[i] = ATA_DEV_NONE;
1380 /* read IDENTIFY page and configure devices */
1381 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1382 struct ata_device *dev = &ap->device[i];
1384 dev->class = classes[i];
1386 if (!ata_dev_present(dev))
1389 WARN_ON(dev->id != NULL);
1390 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1391 dev->class = ATA_DEV_NONE;
1395 if (ata_dev_configure(ap, dev, 1)) {
1396 dev->class++; /* disable device */
1404 goto err_out_disable;
1407 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1408 goto err_out_disable;
1413 ap->ops->port_disable(ap);
1418 * ata_port_probe - Mark port as enabled
1419 * @ap: Port for which we indicate enablement
1421 * Modify @ap data structure such that the system
1422 * thinks that the entire port is enabled.
1424 * LOCKING: host_set lock, or some other form of
1428 void ata_port_probe(struct ata_port *ap)
1430 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1434 * sata_print_link_status - Print SATA link status
1435 * @ap: SATA port to printk link status about
1437 * This function prints link speed and status of a SATA link.
1442 static void sata_print_link_status(struct ata_port *ap)
1447 if (!ap->ops->scr_read)
1450 sstatus = scr_read(ap, SCR_STATUS);
1452 if (sata_dev_present(ap)) {
1453 tmp = (sstatus >> 4) & 0xf;
1456 else if (tmp & (1 << 1))
1459 speed = "<unknown>";
1460 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1461 ap->id, speed, sstatus);
1463 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1469 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1470 * @ap: SATA port associated with target SATA PHY.
1472 * This function issues commands to standard SATA Sxxx
1473 * PHY registers, to wake up the phy (and device), and
1474 * clear any reset condition.
1477 * PCI/etc. bus probe sem.
1480 void __sata_phy_reset(struct ata_port *ap)
1483 unsigned long timeout = jiffies + (HZ * 5);
1485 if (ap->flags & ATA_FLAG_SATA_RESET) {
1486 /* issue phy wake/reset */
1487 scr_write_flush(ap, SCR_CONTROL, 0x301);
1488 /* Couldn't find anything in SATA I/II specs, but
1489 * AHCI-1.1 10.4.2 says at least 1 ms. */
1492 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1494 /* wait for phy to become ready, if necessary */
1497 sstatus = scr_read(ap, SCR_STATUS);
1498 if ((sstatus & 0xf) != 1)
1500 } while (time_before(jiffies, timeout));
1502 /* print link status */
1503 sata_print_link_status(ap);
1505 /* TODO: phy layer with polling, timeouts, etc. */
1506 if (sata_dev_present(ap))
1509 ata_port_disable(ap);
1511 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1514 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1515 ata_port_disable(ap);
1519 ap->cbl = ATA_CBL_SATA;
1523 * sata_phy_reset - Reset SATA bus.
1524 * @ap: SATA port associated with target SATA PHY.
1526 * This function resets the SATA bus, and then probes
1527 * the bus for devices.
1530 * PCI/etc. bus probe sem.
1533 void sata_phy_reset(struct ata_port *ap)
1535 __sata_phy_reset(ap);
1536 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1542 * ata_port_disable - Disable port.
1543 * @ap: Port to be disabled.
1545 * Modify @ap data structure such that the system
1546 * thinks that the entire port is disabled, and should
1547 * never attempt to probe or communicate with devices
1550 * LOCKING: host_set lock, or some other form of
1554 void ata_port_disable(struct ata_port *ap)
1556 ap->device[0].class = ATA_DEV_NONE;
1557 ap->device[1].class = ATA_DEV_NONE;
1558 ap->flags |= ATA_FLAG_PORT_DISABLED;
1562 * This mode timing computation functionality is ported over from
1563 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1566 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1567 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1568 * for PIO 5, which is a nonstandard extension and UDMA6, which
1569 * is currently supported only by Maxtor drives.
1572 static const struct ata_timing ata_timing[] = {
1574 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1575 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1576 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1577 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1579 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1580 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1581 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1583 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1585 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1586 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1587 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1589 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1590 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1591 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1593 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1594 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1595 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1597 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1598 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1599 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1601 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1606 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1607 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1609 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1611 q->setup = EZ(t->setup * 1000, T);
1612 q->act8b = EZ(t->act8b * 1000, T);
1613 q->rec8b = EZ(t->rec8b * 1000, T);
1614 q->cyc8b = EZ(t->cyc8b * 1000, T);
1615 q->active = EZ(t->active * 1000, T);
1616 q->recover = EZ(t->recover * 1000, T);
1617 q->cycle = EZ(t->cycle * 1000, T);
1618 q->udma = EZ(t->udma * 1000, UT);
1621 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1622 struct ata_timing *m, unsigned int what)
1624 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1625 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1626 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1627 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1628 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1629 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1630 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1631 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1634 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1636 const struct ata_timing *t;
1638 for (t = ata_timing; t->mode != speed; t++)
1639 if (t->mode == 0xFF)
1644 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1645 struct ata_timing *t, int T, int UT)
1647 const struct ata_timing *s;
1648 struct ata_timing p;
1654 if (!(s = ata_timing_find_mode(speed)))
1657 memcpy(t, s, sizeof(*s));
1660 * If the drive is an EIDE drive, it can tell us it needs extended
1661 * PIO/MW_DMA cycle timing.
1664 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1665 memset(&p, 0, sizeof(p));
1666 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1667 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1668 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1669 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1670 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1672 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1676 * Convert the timing to bus clock counts.
1679 ata_timing_quantize(t, t, T, UT);
1682 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1683 * S.M.A.R.T * and some other commands. We have to ensure that the
1684 * DMA cycle timing is slower/equal than the fastest PIO timing.
1687 if (speed > XFER_PIO_4) {
1688 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1689 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1693 * Lengthen active & recovery time so that cycle time is correct.
1696 if (t->act8b + t->rec8b < t->cyc8b) {
1697 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1698 t->rec8b = t->cyc8b - t->act8b;
1701 if (t->active + t->recover < t->cycle) {
1702 t->active += (t->cycle - (t->active + t->recover)) / 2;
1703 t->recover = t->cycle - t->active;
1709 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1711 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1714 if (dev->xfer_shift == ATA_SHIFT_PIO)
1715 dev->flags |= ATA_DFLAG_PIO;
1717 ata_dev_set_xfermode(ap, dev);
1719 if (ata_dev_revalidate(ap, dev, 0)) {
1720 printk(KERN_ERR "ata%u: failed to revalidate after set "
1721 "xfermode, disabled\n", ap->id);
1722 ata_port_disable(ap);
1725 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1726 dev->xfer_shift, (int)dev->xfer_mode);
1728 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1730 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1733 static int ata_host_set_pio(struct ata_port *ap)
1737 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1738 struct ata_device *dev = &ap->device[i];
1740 if (!ata_dev_present(dev))
1743 if (!dev->pio_mode) {
1744 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1748 dev->xfer_mode = dev->pio_mode;
1749 dev->xfer_shift = ATA_SHIFT_PIO;
1750 if (ap->ops->set_piomode)
1751 ap->ops->set_piomode(ap, dev);
1757 static void ata_host_set_dma(struct ata_port *ap)
1761 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1762 struct ata_device *dev = &ap->device[i];
1764 if (!ata_dev_present(dev) || !dev->dma_mode)
1767 dev->xfer_mode = dev->dma_mode;
1768 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1769 if (ap->ops->set_dmamode)
1770 ap->ops->set_dmamode(ap, dev);
1775 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1776 * @ap: port on which timings will be programmed
1778 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1781 * PCI/etc. bus probe sem.
1783 static void ata_set_mode(struct ata_port *ap)
1787 /* step 1: calculate xfer_mask */
1788 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1789 struct ata_device *dev = &ap->device[i];
1790 unsigned int xfer_mask;
1792 if (!ata_dev_present(dev))
1795 xfer_mask = ata_dev_xfermask(ap, dev);
1797 dev->pio_mode = ata_xfer_mask2mode(xfer_mask & ATA_MASK_PIO);
1798 dev->dma_mode = ata_xfer_mask2mode(xfer_mask & (ATA_MASK_MWDMA |
1802 /* step 2: always set host PIO timings */
1803 rc = ata_host_set_pio(ap);
1807 /* step 3: set host DMA timings */
1808 ata_host_set_dma(ap);
1810 /* step 4: update devices' xfer mode */
1811 for (i = 0; i < ATA_MAX_DEVICES; i++)
1812 ata_dev_set_mode(ap, &ap->device[i]);
1814 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1817 if (ap->ops->post_set_mode)
1818 ap->ops->post_set_mode(ap);
1823 ata_port_disable(ap);
1827 * ata_tf_to_host - issue ATA taskfile to host controller
1828 * @ap: port to which command is being issued
1829 * @tf: ATA taskfile register set
1831 * Issues ATA taskfile register set to ATA host controller,
1832 * with proper synchronization with interrupt handler and
1836 * spin_lock_irqsave(host_set lock)
1839 static inline void ata_tf_to_host(struct ata_port *ap,
1840 const struct ata_taskfile *tf)
1842 ap->ops->tf_load(ap, tf);
1843 ap->ops->exec_command(ap, tf);
1847 * ata_busy_sleep - sleep until BSY clears, or timeout
1848 * @ap: port containing status register to be polled
1849 * @tmout_pat: impatience timeout
1850 * @tmout: overall timeout
1852 * Sleep until ATA Status register bit BSY clears,
1853 * or a timeout occurs.
1858 unsigned int ata_busy_sleep (struct ata_port *ap,
1859 unsigned long tmout_pat, unsigned long tmout)
1861 unsigned long timer_start, timeout;
1864 status = ata_busy_wait(ap, ATA_BUSY, 300);
1865 timer_start = jiffies;
1866 timeout = timer_start + tmout_pat;
1867 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1869 status = ata_busy_wait(ap, ATA_BUSY, 3);
1872 if (status & ATA_BUSY)
1873 printk(KERN_WARNING "ata%u is slow to respond, "
1874 "please be patient\n", ap->id);
1876 timeout = timer_start + tmout;
1877 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1879 status = ata_chk_status(ap);
1882 if (status & ATA_BUSY) {
1883 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1884 ap->id, tmout / HZ);
1891 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1893 struct ata_ioports *ioaddr = &ap->ioaddr;
1894 unsigned int dev0 = devmask & (1 << 0);
1895 unsigned int dev1 = devmask & (1 << 1);
1896 unsigned long timeout;
1898 /* if device 0 was found in ata_devchk, wait for its
1902 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1904 /* if device 1 was found in ata_devchk, wait for
1905 * register access, then wait for BSY to clear
1907 timeout = jiffies + ATA_TMOUT_BOOT;
1911 ap->ops->dev_select(ap, 1);
1912 if (ap->flags & ATA_FLAG_MMIO) {
1913 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1914 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1916 nsect = inb(ioaddr->nsect_addr);
1917 lbal = inb(ioaddr->lbal_addr);
1919 if ((nsect == 1) && (lbal == 1))
1921 if (time_after(jiffies, timeout)) {
1925 msleep(50); /* give drive a breather */
1928 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1930 /* is all this really necessary? */
1931 ap->ops->dev_select(ap, 0);
1933 ap->ops->dev_select(ap, 1);
1935 ap->ops->dev_select(ap, 0);
1939 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1940 * @ap: Port to reset and probe
1942 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1943 * probe the bus. Not often used these days.
1946 * PCI/etc. bus probe sem.
1947 * Obtains host_set lock.
1951 static unsigned int ata_bus_edd(struct ata_port *ap)
1953 struct ata_taskfile tf;
1954 unsigned long flags;
1956 /* set up execute-device-diag (bus reset) taskfile */
1957 /* also, take interrupts to a known state (disabled) */
1958 DPRINTK("execute-device-diag\n");
1959 ata_tf_init(ap, &tf, 0);
1961 tf.command = ATA_CMD_EDD;
1962 tf.protocol = ATA_PROT_NODATA;
1965 spin_lock_irqsave(&ap->host_set->lock, flags);
1966 ata_tf_to_host(ap, &tf);
1967 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1969 /* spec says at least 2ms. but who knows with those
1970 * crazy ATAPI devices...
1974 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1977 static unsigned int ata_bus_softreset(struct ata_port *ap,
1978 unsigned int devmask)
1980 struct ata_ioports *ioaddr = &ap->ioaddr;
1982 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1984 /* software reset. causes dev0 to be selected */
1985 if (ap->flags & ATA_FLAG_MMIO) {
1986 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1987 udelay(20); /* FIXME: flush */
1988 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1989 udelay(20); /* FIXME: flush */
1990 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1992 outb(ap->ctl, ioaddr->ctl_addr);
1994 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1996 outb(ap->ctl, ioaddr->ctl_addr);
1999 /* spec mandates ">= 2ms" before checking status.
2000 * We wait 150ms, because that was the magic delay used for
2001 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2002 * between when the ATA command register is written, and then
2003 * status is checked. Because waiting for "a while" before
2004 * checking status is fine, post SRST, we perform this magic
2005 * delay here as well.
2007 * Old drivers/ide uses the 2mS rule and then waits for ready
2012 /* Before we perform post reset processing we want to see if
2013 the bus shows 0xFF because the odd clown forgets the D7 pulldown
2016 if (ata_check_status(ap) == 0xFF)
2017 return 1; /* Positive is failure for some reason */
2019 ata_bus_post_reset(ap, devmask);
2025 * ata_bus_reset - reset host port and associated ATA channel
2026 * @ap: port to reset
2028 * This is typically the first time we actually start issuing
2029 * commands to the ATA channel. We wait for BSY to clear, then
2030 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2031 * result. Determine what devices, if any, are on the channel
2032 * by looking at the device 0/1 error register. Look at the signature
2033 * stored in each device's taskfile registers, to determine if
2034 * the device is ATA or ATAPI.
2037 * PCI/etc. bus probe sem.
2038 * Obtains host_set lock.
2041 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2044 void ata_bus_reset(struct ata_port *ap)
2046 struct ata_ioports *ioaddr = &ap->ioaddr;
2047 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2049 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
2051 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2053 /* determine if device 0/1 are present */
2054 if (ap->flags & ATA_FLAG_SATA_RESET)
2057 dev0 = ata_devchk(ap, 0);
2059 dev1 = ata_devchk(ap, 1);
2063 devmask |= (1 << 0);
2065 devmask |= (1 << 1);
2067 /* select device 0 again */
2068 ap->ops->dev_select(ap, 0);
2070 /* issue bus reset */
2071 if (ap->flags & ATA_FLAG_SRST)
2072 rc = ata_bus_softreset(ap, devmask);
2073 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
2074 /* set up device control */
2075 if (ap->flags & ATA_FLAG_MMIO)
2076 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2078 outb(ap->ctl, ioaddr->ctl_addr);
2079 rc = ata_bus_edd(ap);
2086 * determine by signature whether we have ATA or ATAPI devices
2088 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2089 if ((slave_possible) && (err != 0x81))
2090 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2092 /* re-enable interrupts */
2093 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2096 /* is double-select really necessary? */
2097 if (ap->device[1].class != ATA_DEV_NONE)
2098 ap->ops->dev_select(ap, 1);
2099 if (ap->device[0].class != ATA_DEV_NONE)
2100 ap->ops->dev_select(ap, 0);
2102 /* if no devices were detected, disable this port */
2103 if ((ap->device[0].class == ATA_DEV_NONE) &&
2104 (ap->device[1].class == ATA_DEV_NONE))
2107 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2108 /* set up device control for ATA_FLAG_SATA_RESET */
2109 if (ap->flags & ATA_FLAG_MMIO)
2110 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2112 outb(ap->ctl, ioaddr->ctl_addr);
2119 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2120 ap->ops->port_disable(ap);
2125 static int sata_phy_resume(struct ata_port *ap)
2127 unsigned long timeout = jiffies + (HZ * 5);
2130 scr_write_flush(ap, SCR_CONTROL, 0x300);
2132 /* Wait for phy to become ready, if necessary. */
2135 sstatus = scr_read(ap, SCR_STATUS);
2136 if ((sstatus & 0xf) != 1)
2138 } while (time_before(jiffies, timeout));
2144 * ata_std_probeinit - initialize probing
2145 * @ap: port to be probed
2147 * @ap is about to be probed. Initialize it. This function is
2148 * to be used as standard callback for ata_drive_probe_reset().
2150 * NOTE!!! Do not use this function as probeinit if a low level
2151 * driver implements only hardreset. Just pass NULL as probeinit
2152 * in that case. Using this function is probably okay but doing
2153 * so makes reset sequence different from the original
2154 * ->phy_reset implementation and Jeff nervous. :-P
2156 extern void ata_std_probeinit(struct ata_port *ap)
2158 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2159 sata_phy_resume(ap);
2160 if (sata_dev_present(ap))
2161 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2166 * ata_std_softreset - reset host port via ATA SRST
2167 * @ap: port to reset
2168 * @verbose: fail verbosely
2169 * @classes: resulting classes of attached devices
2171 * Reset host port using ATA SRST. This function is to be used
2172 * as standard callback for ata_drive_*_reset() functions.
2175 * Kernel thread context (may sleep)
2178 * 0 on success, -errno otherwise.
2180 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2182 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2183 unsigned int devmask = 0, err_mask;
2188 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2189 classes[0] = ATA_DEV_NONE;
2193 /* determine if device 0/1 are present */
2194 if (ata_devchk(ap, 0))
2195 devmask |= (1 << 0);
2196 if (slave_possible && ata_devchk(ap, 1))
2197 devmask |= (1 << 1);
2199 /* select device 0 again */
2200 ap->ops->dev_select(ap, 0);
2202 /* issue bus reset */
2203 DPRINTK("about to softreset, devmask=%x\n", devmask);
2204 err_mask = ata_bus_softreset(ap, devmask);
2207 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2210 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2215 /* determine by signature whether we have ATA or ATAPI devices */
2216 classes[0] = ata_dev_try_classify(ap, 0, &err);
2217 if (slave_possible && err != 0x81)
2218 classes[1] = ata_dev_try_classify(ap, 1, &err);
2221 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2226 * sata_std_hardreset - reset host port via SATA phy reset
2227 * @ap: port to reset
2228 * @verbose: fail verbosely
2229 * @class: resulting class of attached device
2231 * SATA phy-reset host port using DET bits of SControl register.
2232 * This function is to be used as standard callback for
2233 * ata_drive_*_reset().
2236 * Kernel thread context (may sleep)
2239 * 0 on success, -errno otherwise.
2241 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2245 /* Issue phy wake/reset */
2246 scr_write_flush(ap, SCR_CONTROL, 0x301);
2249 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2250 * 10.4.2 says at least 1 ms.
2254 /* Bring phy back */
2255 sata_phy_resume(ap);
2257 /* TODO: phy layer with polling, timeouts, etc. */
2258 if (!sata_dev_present(ap)) {
2259 *class = ATA_DEV_NONE;
2260 DPRINTK("EXIT, link offline\n");
2264 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2266 printk(KERN_ERR "ata%u: COMRESET failed "
2267 "(device not ready)\n", ap->id);
2269 DPRINTK("EXIT, device not ready\n");
2273 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2275 *class = ata_dev_try_classify(ap, 0, NULL);
2277 DPRINTK("EXIT, class=%u\n", *class);
2282 * ata_std_postreset - standard postreset callback
2283 * @ap: the target ata_port
2284 * @classes: classes of attached devices
2286 * This function is invoked after a successful reset. Note that
2287 * the device might have been reset more than once using
2288 * different reset methods before postreset is invoked.
2290 * This function is to be used as standard callback for
2291 * ata_drive_*_reset().
2294 * Kernel thread context (may sleep)
2296 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2300 /* set cable type if it isn't already set */
2301 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2302 ap->cbl = ATA_CBL_SATA;
2304 /* print link status */
2305 if (ap->cbl == ATA_CBL_SATA)
2306 sata_print_link_status(ap);
2308 /* re-enable interrupts */
2309 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2312 /* is double-select really necessary? */
2313 if (classes[0] != ATA_DEV_NONE)
2314 ap->ops->dev_select(ap, 1);
2315 if (classes[1] != ATA_DEV_NONE)
2316 ap->ops->dev_select(ap, 0);
2318 /* bail out if no device is present */
2319 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2320 DPRINTK("EXIT, no device\n");
2324 /* set up device control */
2325 if (ap->ioaddr.ctl_addr) {
2326 if (ap->flags & ATA_FLAG_MMIO)
2327 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2329 outb(ap->ctl, ap->ioaddr.ctl_addr);
2336 * ata_std_probe_reset - standard probe reset method
2337 * @ap: prot to perform probe-reset
2338 * @classes: resulting classes of attached devices
2340 * The stock off-the-shelf ->probe_reset method.
2343 * Kernel thread context (may sleep)
2346 * 0 on success, -errno otherwise.
2348 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2350 ata_reset_fn_t hardreset;
2353 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2354 hardreset = sata_std_hardreset;
2356 return ata_drive_probe_reset(ap, ata_std_probeinit,
2357 ata_std_softreset, hardreset,
2358 ata_std_postreset, classes);
2361 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2362 ata_postreset_fn_t postreset,
2363 unsigned int *classes)
2367 for (i = 0; i < ATA_MAX_DEVICES; i++)
2368 classes[i] = ATA_DEV_UNKNOWN;
2370 rc = reset(ap, 0, classes);
2374 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2375 * is complete and convert all ATA_DEV_UNKNOWN to
2378 for (i = 0; i < ATA_MAX_DEVICES; i++)
2379 if (classes[i] != ATA_DEV_UNKNOWN)
2382 if (i < ATA_MAX_DEVICES)
2383 for (i = 0; i < ATA_MAX_DEVICES; i++)
2384 if (classes[i] == ATA_DEV_UNKNOWN)
2385 classes[i] = ATA_DEV_NONE;
2388 postreset(ap, classes);
2390 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2394 * ata_drive_probe_reset - Perform probe reset with given methods
2395 * @ap: port to reset
2396 * @probeinit: probeinit method (can be NULL)
2397 * @softreset: softreset method (can be NULL)
2398 * @hardreset: hardreset method (can be NULL)
2399 * @postreset: postreset method (can be NULL)
2400 * @classes: resulting classes of attached devices
2402 * Reset the specified port and classify attached devices using
2403 * given methods. This function prefers softreset but tries all
2404 * possible reset sequences to reset and classify devices. This
2405 * function is intended to be used for constructing ->probe_reset
2406 * callback by low level drivers.
2408 * Reset methods should follow the following rules.
2410 * - Return 0 on sucess, -errno on failure.
2411 * - If classification is supported, fill classes[] with
2412 * recognized class codes.
2413 * - If classification is not supported, leave classes[] alone.
2414 * - If verbose is non-zero, print error message on failure;
2415 * otherwise, shut up.
2418 * Kernel thread context (may sleep)
2421 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2422 * if classification fails, and any error code from reset
2425 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2426 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2427 ata_postreset_fn_t postreset, unsigned int *classes)
2435 rc = do_probe_reset(ap, softreset, postreset, classes);
2443 rc = do_probe_reset(ap, hardreset, postreset, classes);
2444 if (rc == 0 || rc != -ENODEV)
2448 rc = do_probe_reset(ap, softreset, postreset, classes);
2454 * ata_dev_same_device - Determine whether new ID matches configured device
2455 * @ap: port on which the device to compare against resides
2456 * @dev: device to compare against
2457 * @new_class: class of the new device
2458 * @new_id: IDENTIFY page of the new device
2460 * Compare @new_class and @new_id against @dev and determine
2461 * whether @dev is the device indicated by @new_class and
2468 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2470 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2471 unsigned int new_class, const u16 *new_id)
2473 const u16 *old_id = dev->id;
2474 unsigned char model[2][41], serial[2][21];
2477 if (dev->class != new_class) {
2479 "ata%u: dev %u class mismatch %d != %d\n",
2480 ap->id, dev->devno, dev->class, new_class);
2484 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2485 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2486 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2487 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2488 new_n_sectors = ata_id_n_sectors(new_id);
2490 if (strcmp(model[0], model[1])) {
2492 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2493 ap->id, dev->devno, model[0], model[1]);
2497 if (strcmp(serial[0], serial[1])) {
2499 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2500 ap->id, dev->devno, serial[0], serial[1]);
2504 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2506 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2507 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2508 (unsigned long long)new_n_sectors);
2516 * ata_dev_revalidate - Revalidate ATA device
2517 * @ap: port on which the device to revalidate resides
2518 * @dev: device to revalidate
2519 * @post_reset: is this revalidation after reset?
2521 * Re-read IDENTIFY page and make sure @dev is still attached to
2525 * Kernel thread context (may sleep)
2528 * 0 on success, negative errno otherwise
2530 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2537 if (!ata_dev_present(dev))
2543 /* allocate & read ID data */
2544 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2548 /* is the device still there? */
2549 if (!ata_dev_same_device(ap, dev, class, id)) {
2557 /* configure device according to the new ID */
2558 return ata_dev_configure(ap, dev, 0);
2561 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2562 ap->id, dev->devno, rc);
2567 static const char * const ata_dma_blacklist [] = {
2568 "WDC AC11000H", NULL,
2569 "WDC AC22100H", NULL,
2570 "WDC AC32500H", NULL,
2571 "WDC AC33100H", NULL,
2572 "WDC AC31600H", NULL,
2573 "WDC AC32100H", "24.09P07",
2574 "WDC AC23200L", "21.10N21",
2575 "Compaq CRD-8241B", NULL,
2580 "SanDisk SDP3B", NULL,
2581 "SanDisk SDP3B-64", NULL,
2582 "SANYO CD-ROM CRD", NULL,
2583 "HITACHI CDR-8", NULL,
2584 "HITACHI CDR-8335", NULL,
2585 "HITACHI CDR-8435", NULL,
2586 "Toshiba CD-ROM XM-6202B", NULL,
2587 "TOSHIBA CD-ROM XM-1702BC", NULL,
2589 "E-IDE CD-ROM CR-840", NULL,
2590 "CD-ROM Drive/F5A", NULL,
2591 "WPI CDD-820", NULL,
2592 "SAMSUNG CD-ROM SC-148C", NULL,
2593 "SAMSUNG CD-ROM SC", NULL,
2594 "SanDisk SDP3B-64", NULL,
2595 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2596 "_NEC DV5800A", NULL,
2597 "SAMSUNG CD-ROM SN-124", "N001"
2600 static int ata_strim(char *s, size_t len)
2602 len = strnlen(s, len);
2604 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2605 while ((len > 0) && (s[len - 1] == ' ')) {
2612 static int ata_dma_blacklisted(const struct ata_device *dev)
2614 unsigned char model_num[40];
2615 unsigned char model_rev[16];
2616 unsigned int nlen, rlen;
2619 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2621 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2623 nlen = ata_strim(model_num, sizeof(model_num));
2624 rlen = ata_strim(model_rev, sizeof(model_rev));
2626 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2627 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2628 if (ata_dma_blacklist[i+1] == NULL)
2630 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2638 * ata_dev_xfermask - Compute supported xfermask of the given device
2639 * @ap: Port on which the device to compute xfermask for resides
2640 * @dev: Device to compute xfermask for
2642 * Compute supported xfermask of @dev. This function is
2643 * responsible for applying all known limits including host
2644 * controller limits, device blacklist, etc...
2650 * Computed xfermask.
2652 static unsigned int ata_dev_xfermask(struct ata_port *ap,
2653 struct ata_device *dev)
2655 unsigned long xfer_mask;
2658 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2661 /* use port-wide xfermask for now */
2662 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2663 struct ata_device *d = &ap->device[i];
2664 if (!ata_dev_present(d))
2666 xfer_mask &= ata_id_xfermask(d->id);
2667 if (ata_dma_blacklisted(d))
2668 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2671 if (ata_dma_blacklisted(dev))
2672 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2673 "disabling DMA\n", ap->id, dev->devno);
2679 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2680 * @ap: Port associated with device @dev
2681 * @dev: Device to which command will be sent
2683 * Issue SET FEATURES - XFER MODE command to device @dev
2687 * PCI/etc. bus probe sem.
2690 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2692 struct ata_taskfile tf;
2694 /* set up set-features taskfile */
2695 DPRINTK("set features - xfer mode\n");
2697 ata_tf_init(ap, &tf, dev->devno);
2698 tf.command = ATA_CMD_SET_FEATURES;
2699 tf.feature = SETFEATURES_XFER;
2700 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2701 tf.protocol = ATA_PROT_NODATA;
2702 tf.nsect = dev->xfer_mode;
2704 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2705 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2707 ata_port_disable(ap);
2714 * ata_dev_init_params - Issue INIT DEV PARAMS command
2715 * @ap: Port associated with device @dev
2716 * @dev: Device to which command will be sent
2719 * Kernel thread context (may sleep)
2722 * 0 on success, AC_ERR_* mask otherwise.
2725 static unsigned int ata_dev_init_params(struct ata_port *ap,
2726 struct ata_device *dev)
2728 struct ata_taskfile tf;
2729 unsigned int err_mask;
2730 u16 sectors = dev->id[6];
2731 u16 heads = dev->id[3];
2733 /* Number of sectors per track 1-255. Number of heads 1-16 */
2734 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2737 /* set up init dev params taskfile */
2738 DPRINTK("init dev params \n");
2740 ata_tf_init(ap, &tf, dev->devno);
2741 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2742 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2743 tf.protocol = ATA_PROT_NODATA;
2745 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2747 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2749 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2754 * ata_sg_clean - Unmap DMA memory associated with command
2755 * @qc: Command containing DMA memory to be released
2757 * Unmap all mapped DMA memory associated with this command.
2760 * spin_lock_irqsave(host_set lock)
2763 static void ata_sg_clean(struct ata_queued_cmd *qc)
2765 struct ata_port *ap = qc->ap;
2766 struct scatterlist *sg = qc->__sg;
2767 int dir = qc->dma_dir;
2768 void *pad_buf = NULL;
2770 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2771 WARN_ON(sg == NULL);
2773 if (qc->flags & ATA_QCFLAG_SINGLE)
2774 WARN_ON(qc->n_elem > 1);
2776 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2778 /* if we padded the buffer out to 32-bit bound, and data
2779 * xfer direction is from-device, we must copy from the
2780 * pad buffer back into the supplied buffer
2782 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2783 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2785 if (qc->flags & ATA_QCFLAG_SG) {
2787 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2788 /* restore last sg */
2789 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2791 struct scatterlist *psg = &qc->pad_sgent;
2792 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2793 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2794 kunmap_atomic(addr, KM_IRQ0);
2798 dma_unmap_single(ap->host_set->dev,
2799 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2802 sg->length += qc->pad_len;
2804 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2805 pad_buf, qc->pad_len);
2808 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2813 * ata_fill_sg - Fill PCI IDE PRD table
2814 * @qc: Metadata associated with taskfile to be transferred
2816 * Fill PCI IDE PRD (scatter-gather) table with segments
2817 * associated with the current disk command.
2820 * spin_lock_irqsave(host_set lock)
2823 static void ata_fill_sg(struct ata_queued_cmd *qc)
2825 struct ata_port *ap = qc->ap;
2826 struct scatterlist *sg;
2829 WARN_ON(qc->__sg == NULL);
2830 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2833 ata_for_each_sg(sg, qc) {
2837 /* determine if physical DMA addr spans 64K boundary.
2838 * Note h/w doesn't support 64-bit, so we unconditionally
2839 * truncate dma_addr_t to u32.
2841 addr = (u32) sg_dma_address(sg);
2842 sg_len = sg_dma_len(sg);
2845 offset = addr & 0xffff;
2847 if ((offset + sg_len) > 0x10000)
2848 len = 0x10000 - offset;
2850 ap->prd[idx].addr = cpu_to_le32(addr);
2851 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2852 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2861 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2864 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2865 * @qc: Metadata associated with taskfile to check
2867 * Allow low-level driver to filter ATA PACKET commands, returning
2868 * a status indicating whether or not it is OK to use DMA for the
2869 * supplied PACKET command.
2872 * spin_lock_irqsave(host_set lock)
2874 * RETURNS: 0 when ATAPI DMA can be used
2877 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2879 struct ata_port *ap = qc->ap;
2880 int rc = 0; /* Assume ATAPI DMA is OK by default */
2882 if (ap->ops->check_atapi_dma)
2883 rc = ap->ops->check_atapi_dma(qc);
2888 * ata_qc_prep - Prepare taskfile for submission
2889 * @qc: Metadata associated with taskfile to be prepared
2891 * Prepare ATA taskfile for submission.
2894 * spin_lock_irqsave(host_set lock)
2896 void ata_qc_prep(struct ata_queued_cmd *qc)
2898 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2904 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2907 * ata_sg_init_one - Associate command with memory buffer
2908 * @qc: Command to be associated
2909 * @buf: Memory buffer
2910 * @buflen: Length of memory buffer, in bytes.
2912 * Initialize the data-related elements of queued_cmd @qc
2913 * to point to a single memory buffer, @buf of byte length @buflen.
2916 * spin_lock_irqsave(host_set lock)
2919 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2921 struct scatterlist *sg;
2923 qc->flags |= ATA_QCFLAG_SINGLE;
2925 memset(&qc->sgent, 0, sizeof(qc->sgent));
2926 qc->__sg = &qc->sgent;
2928 qc->orig_n_elem = 1;
2932 sg_init_one(sg, buf, buflen);
2936 * ata_sg_init - Associate command with scatter-gather table.
2937 * @qc: Command to be associated
2938 * @sg: Scatter-gather table.
2939 * @n_elem: Number of elements in s/g table.
2941 * Initialize the data-related elements of queued_cmd @qc
2942 * to point to a scatter-gather table @sg, containing @n_elem
2946 * spin_lock_irqsave(host_set lock)
2949 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2950 unsigned int n_elem)
2952 qc->flags |= ATA_QCFLAG_SG;
2954 qc->n_elem = n_elem;
2955 qc->orig_n_elem = n_elem;
2959 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2960 * @qc: Command with memory buffer to be mapped.
2962 * DMA-map the memory buffer associated with queued_cmd @qc.
2965 * spin_lock_irqsave(host_set lock)
2968 * Zero on success, negative on error.
2971 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2973 struct ata_port *ap = qc->ap;
2974 int dir = qc->dma_dir;
2975 struct scatterlist *sg = qc->__sg;
2976 dma_addr_t dma_address;
2979 /* we must lengthen transfers to end on a 32-bit boundary */
2980 qc->pad_len = sg->length & 3;
2982 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2983 struct scatterlist *psg = &qc->pad_sgent;
2985 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2987 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2989 if (qc->tf.flags & ATA_TFLAG_WRITE)
2990 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2993 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2994 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2996 sg->length -= qc->pad_len;
2997 if (sg->length == 0)
3000 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3001 sg->length, qc->pad_len);
3009 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
3011 if (dma_mapping_error(dma_address)) {
3013 sg->length += qc->pad_len;
3017 sg_dma_address(sg) = dma_address;
3018 sg_dma_len(sg) = sg->length;
3021 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3022 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3028 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3029 * @qc: Command with scatter-gather table to be mapped.
3031 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3034 * spin_lock_irqsave(host_set lock)
3037 * Zero on success, negative on error.
3041 static int ata_sg_setup(struct ata_queued_cmd *qc)
3043 struct ata_port *ap = qc->ap;
3044 struct scatterlist *sg = qc->__sg;
3045 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3046 int n_elem, pre_n_elem, dir, trim_sg = 0;
3048 VPRINTK("ENTER, ata%u\n", ap->id);
3049 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3051 /* we must lengthen transfers to end on a 32-bit boundary */
3052 qc->pad_len = lsg->length & 3;
3054 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3055 struct scatterlist *psg = &qc->pad_sgent;
3056 unsigned int offset;
3058 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3060 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3063 * psg->page/offset are used to copy to-be-written
3064 * data in this function or read data in ata_sg_clean.
3066 offset = lsg->offset + lsg->length - qc->pad_len;
3067 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3068 psg->offset = offset_in_page(offset);
3070 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3071 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3072 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3073 kunmap_atomic(addr, KM_IRQ0);
3076 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3077 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3079 lsg->length -= qc->pad_len;
3080 if (lsg->length == 0)
3083 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3084 qc->n_elem - 1, lsg->length, qc->pad_len);
3087 pre_n_elem = qc->n_elem;
3088 if (trim_sg && pre_n_elem)
3097 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3099 /* restore last sg */
3100 lsg->length += qc->pad_len;
3104 DPRINTK("%d sg elements mapped\n", n_elem);
3107 qc->n_elem = n_elem;
3113 * ata_poll_qc_complete - turn irq back on and finish qc
3114 * @qc: Command to complete
3115 * @err_mask: ATA status register content
3118 * None. (grabs host lock)
3121 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3123 struct ata_port *ap = qc->ap;
3124 unsigned long flags;
3126 spin_lock_irqsave(&ap->host_set->lock, flags);
3128 ata_qc_complete(qc);
3129 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3133 * ata_pio_poll - poll using PIO, depending on current state
3134 * @ap: the target ata_port
3137 * None. (executing in kernel thread context)
3140 * timeout value to use
3143 static unsigned long ata_pio_poll(struct ata_port *ap)
3145 struct ata_queued_cmd *qc;
3147 unsigned int poll_state = HSM_ST_UNKNOWN;
3148 unsigned int reg_state = HSM_ST_UNKNOWN;
3150 qc = ata_qc_from_tag(ap, ap->active_tag);
3151 WARN_ON(qc == NULL);
3153 switch (ap->hsm_task_state) {
3156 poll_state = HSM_ST_POLL;
3160 case HSM_ST_LAST_POLL:
3161 poll_state = HSM_ST_LAST_POLL;
3162 reg_state = HSM_ST_LAST;
3169 status = ata_chk_status(ap);
3170 if (status & ATA_BUSY) {
3171 if (time_after(jiffies, ap->pio_task_timeout)) {
3172 qc->err_mask |= AC_ERR_TIMEOUT;
3173 ap->hsm_task_state = HSM_ST_TMOUT;
3176 ap->hsm_task_state = poll_state;
3177 return ATA_SHORT_PAUSE;
3180 ap->hsm_task_state = reg_state;
3185 * ata_pio_complete - check if drive is busy or idle
3186 * @ap: the target ata_port
3189 * None. (executing in kernel thread context)
3192 * Zero if qc completed.
3193 * Non-zero if has next.
3196 static int ata_pio_complete (struct ata_port *ap)
3198 struct ata_queued_cmd *qc;
3202 * This is purely heuristic. This is a fast path. Sometimes when
3203 * we enter, BSY will be cleared in a chk-status or two. If not,
3204 * the drive is probably seeking or something. Snooze for a couple
3205 * msecs, then chk-status again. If still busy, fall back to
3206 * HSM_ST_LAST_POLL state.
3208 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3209 if (drv_stat & ATA_BUSY) {
3211 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3212 if (drv_stat & ATA_BUSY) {
3213 ap->hsm_task_state = HSM_ST_LAST_POLL;
3214 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3219 qc = ata_qc_from_tag(ap, ap->active_tag);
3220 WARN_ON(qc == NULL);
3222 drv_stat = ata_wait_idle(ap);
3223 if (!ata_ok(drv_stat)) {
3224 qc->err_mask |= __ac_err_mask(drv_stat);
3225 ap->hsm_task_state = HSM_ST_ERR;
3229 ap->hsm_task_state = HSM_ST_IDLE;
3231 WARN_ON(qc->err_mask);
3232 ata_poll_qc_complete(qc);
3234 /* another command may start at this point */
3241 * swap_buf_le16 - swap halves of 16-bit words in place
3242 * @buf: Buffer to swap
3243 * @buf_words: Number of 16-bit words in buffer.
3245 * Swap halves of 16-bit words if needed to convert from
3246 * little-endian byte order to native cpu byte order, or
3250 * Inherited from caller.
3252 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3257 for (i = 0; i < buf_words; i++)
3258 buf[i] = le16_to_cpu(buf[i]);
3259 #endif /* __BIG_ENDIAN */
3263 * ata_mmio_data_xfer - Transfer data by MMIO
3264 * @ap: port to read/write
3266 * @buflen: buffer length
3267 * @write_data: read/write
3269 * Transfer data from/to the device data register by MMIO.
3272 * Inherited from caller.
3275 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3276 unsigned int buflen, int write_data)
3279 unsigned int words = buflen >> 1;
3280 u16 *buf16 = (u16 *) buf;
3281 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3283 /* Transfer multiple of 2 bytes */
3285 for (i = 0; i < words; i++)
3286 writew(le16_to_cpu(buf16[i]), mmio);
3288 for (i = 0; i < words; i++)
3289 buf16[i] = cpu_to_le16(readw(mmio));
3292 /* Transfer trailing 1 byte, if any. */
3293 if (unlikely(buflen & 0x01)) {
3294 u16 align_buf[1] = { 0 };
3295 unsigned char *trailing_buf = buf + buflen - 1;
3298 memcpy(align_buf, trailing_buf, 1);
3299 writew(le16_to_cpu(align_buf[0]), mmio);
3301 align_buf[0] = cpu_to_le16(readw(mmio));
3302 memcpy(trailing_buf, align_buf, 1);
3308 * ata_pio_data_xfer - Transfer data by PIO
3309 * @ap: port to read/write
3311 * @buflen: buffer length
3312 * @write_data: read/write
3314 * Transfer data from/to the device data register by PIO.
3317 * Inherited from caller.
3320 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3321 unsigned int buflen, int write_data)
3323 unsigned int words = buflen >> 1;
3325 /* Transfer multiple of 2 bytes */
3327 outsw(ap->ioaddr.data_addr, buf, words);
3329 insw(ap->ioaddr.data_addr, buf, words);
3331 /* Transfer trailing 1 byte, if any. */
3332 if (unlikely(buflen & 0x01)) {
3333 u16 align_buf[1] = { 0 };
3334 unsigned char *trailing_buf = buf + buflen - 1;
3337 memcpy(align_buf, trailing_buf, 1);
3338 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3340 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3341 memcpy(trailing_buf, align_buf, 1);
3347 * ata_data_xfer - Transfer data from/to the data register.
3348 * @ap: port to read/write
3350 * @buflen: buffer length
3351 * @do_write: read/write
3353 * Transfer data from/to the device data register.
3356 * Inherited from caller.
3359 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3360 unsigned int buflen, int do_write)
3362 /* Make the crap hardware pay the costs not the good stuff */
3363 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3364 unsigned long flags;
3365 local_irq_save(flags);
3366 if (ap->flags & ATA_FLAG_MMIO)
3367 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3369 ata_pio_data_xfer(ap, buf, buflen, do_write);
3370 local_irq_restore(flags);
3372 if (ap->flags & ATA_FLAG_MMIO)
3373 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3375 ata_pio_data_xfer(ap, buf, buflen, do_write);
3380 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3381 * @qc: Command on going
3383 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3386 * Inherited from caller.
3389 static void ata_pio_sector(struct ata_queued_cmd *qc)
3391 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3392 struct scatterlist *sg = qc->__sg;
3393 struct ata_port *ap = qc->ap;
3395 unsigned int offset;
3398 if (qc->cursect == (qc->nsect - 1))
3399 ap->hsm_task_state = HSM_ST_LAST;
3401 page = sg[qc->cursg].page;
3402 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3404 /* get the current page and offset */
3405 page = nth_page(page, (offset >> PAGE_SHIFT));
3406 offset %= PAGE_SIZE;
3408 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3410 if (PageHighMem(page)) {
3411 unsigned long flags;
3413 local_irq_save(flags);
3414 buf = kmap_atomic(page, KM_IRQ0);
3416 /* do the actual data transfer */
3417 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3419 kunmap_atomic(buf, KM_IRQ0);
3420 local_irq_restore(flags);
3422 buf = page_address(page);
3423 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3429 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3436 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3437 * @qc: Command on going
3439 * Transfer one or many ATA_SECT_SIZE of data from/to the
3440 * ATA device for the DRQ request.
3443 * Inherited from caller.
3446 static void ata_pio_sectors(struct ata_queued_cmd *qc)
3448 if (is_multi_taskfile(&qc->tf)) {
3449 /* READ/WRITE MULTIPLE */
3452 WARN_ON(qc->dev->multi_count == 0);
3454 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
3462 * atapi_send_cdb - Write CDB bytes to hardware
3463 * @ap: Port to which ATAPI device is attached.
3464 * @qc: Taskfile currently active
3466 * When device has indicated its readiness to accept
3467 * a CDB, this function is called. Send the CDB.
3473 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3476 DPRINTK("send cdb\n");
3477 WARN_ON(qc->dev->cdb_len < 12);
3479 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3480 ata_altstatus(ap); /* flush */
3482 switch (qc->tf.protocol) {
3483 case ATA_PROT_ATAPI:
3484 ap->hsm_task_state = HSM_ST;
3486 case ATA_PROT_ATAPI_NODATA:
3487 ap->hsm_task_state = HSM_ST_LAST;
3489 case ATA_PROT_ATAPI_DMA:
3490 ap->hsm_task_state = HSM_ST_LAST;
3491 /* initiate bmdma */
3492 ap->ops->bmdma_start(qc);
3498 * ata_pio_first_block - Write first data block to hardware
3499 * @ap: Port to which ATA/ATAPI device is attached.
3501 * When device has indicated its readiness to accept
3502 * the data, this function sends out the CDB or
3503 * the first data block by PIO.
3505 * - If polling, ata_pio_task() handles the rest.
3506 * - Otherwise, interrupt handler takes over.
3509 * Kernel thread context (may sleep)
3512 * Zero if irq handler takes over
3513 * Non-zero if has next (polling).
3516 static int ata_pio_first_block(struct ata_port *ap)
3518 struct ata_queued_cmd *qc;
3520 unsigned long flags;
3523 qc = ata_qc_from_tag(ap, ap->active_tag);
3524 WARN_ON(qc == NULL);
3525 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
3527 /* if polling, we will stay in the work queue after sending the data.
3528 * otherwise, interrupt handler takes over after sending the data.
3530 has_next = (qc->tf.flags & ATA_TFLAG_POLLING);
3532 /* sleep-wait for BSY to clear */
3533 DPRINTK("busy wait\n");
3534 if (ata_busy_sleep(ap, ATA_TMOUT_DATAOUT_QUICK, ATA_TMOUT_DATAOUT)) {
3535 qc->err_mask |= AC_ERR_TIMEOUT;
3536 ap->hsm_task_state = HSM_ST_TMOUT;
3540 /* make sure DRQ is set */
3541 status = ata_chk_status(ap);
3542 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3543 /* device status error */
3544 qc->err_mask |= AC_ERR_HSM;
3545 ap->hsm_task_state = HSM_ST_ERR;
3549 /* Send the CDB (atapi) or the first data block (ata pio out).
3550 * During the state transition, interrupt handler shouldn't
3551 * be invoked before the data transfer is complete and
3552 * hsm_task_state is changed. Hence, the following locking.
3554 spin_lock_irqsave(&ap->host_set->lock, flags);
3556 if (qc->tf.protocol == ATA_PROT_PIO) {
3557 /* PIO data out protocol.
3558 * send first data block.
3561 /* ata_pio_sectors() might change the state to HSM_ST_LAST.
3562 * so, the state is changed here before ata_pio_sectors().
3564 ap->hsm_task_state = HSM_ST;
3565 ata_pio_sectors(qc);
3566 ata_altstatus(ap); /* flush */
3569 atapi_send_cdb(ap, qc);
3571 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3573 /* if polling, ata_pio_task() handles the rest.
3574 * otherwise, interrupt handler takes over from here.
3579 return 1; /* has next */
3583 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3584 * @qc: Command on going
3585 * @bytes: number of bytes
3587 * Transfer Transfer data from/to the ATAPI device.
3590 * Inherited from caller.
3594 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3596 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3597 struct scatterlist *sg = qc->__sg;
3598 struct ata_port *ap = qc->ap;
3601 unsigned int offset, count;
3603 if (qc->curbytes + bytes >= qc->nbytes)
3604 ap->hsm_task_state = HSM_ST_LAST;
3607 if (unlikely(qc->cursg >= qc->n_elem)) {
3609 * The end of qc->sg is reached and the device expects
3610 * more data to transfer. In order not to overrun qc->sg
3611 * and fulfill length specified in the byte count register,
3612 * - for read case, discard trailing data from the device
3613 * - for write case, padding zero data to the device
3615 u16 pad_buf[1] = { 0 };
3616 unsigned int words = bytes >> 1;
3619 if (words) /* warning if bytes > 1 */
3620 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3623 for (i = 0; i < words; i++)
3624 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3626 ap->hsm_task_state = HSM_ST_LAST;
3630 sg = &qc->__sg[qc->cursg];
3633 offset = sg->offset + qc->cursg_ofs;
3635 /* get the current page and offset */
3636 page = nth_page(page, (offset >> PAGE_SHIFT));
3637 offset %= PAGE_SIZE;
3639 /* don't overrun current sg */
3640 count = min(sg->length - qc->cursg_ofs, bytes);
3642 /* don't cross page boundaries */
3643 count = min(count, (unsigned int)PAGE_SIZE - offset);
3645 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3647 if (PageHighMem(page)) {
3648 unsigned long flags;
3650 local_irq_save(flags);
3651 buf = kmap_atomic(page, KM_IRQ0);
3653 /* do the actual data transfer */
3654 ata_data_xfer(ap, buf + offset, count, do_write);
3656 kunmap_atomic(buf, KM_IRQ0);
3657 local_irq_restore(flags);
3659 buf = page_address(page);
3660 ata_data_xfer(ap, buf + offset, count, do_write);
3664 qc->curbytes += count;
3665 qc->cursg_ofs += count;
3667 if (qc->cursg_ofs == sg->length) {
3677 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3678 * @qc: Command on going
3680 * Transfer Transfer data from/to the ATAPI device.
3683 * Inherited from caller.
3686 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3688 struct ata_port *ap = qc->ap;
3689 struct ata_device *dev = qc->dev;
3690 unsigned int ireason, bc_lo, bc_hi, bytes;
3691 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3693 ap->ops->tf_read(ap, &qc->tf);
3694 ireason = qc->tf.nsect;
3695 bc_lo = qc->tf.lbam;
3696 bc_hi = qc->tf.lbah;
3697 bytes = (bc_hi << 8) | bc_lo;
3699 /* shall be cleared to zero, indicating xfer of data */
3700 if (ireason & (1 << 0))
3703 /* make sure transfer direction matches expected */
3704 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3705 if (do_write != i_write)
3708 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
3710 __atapi_pio_bytes(qc, bytes);
3715 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3716 ap->id, dev->devno);
3717 qc->err_mask |= AC_ERR_HSM;
3718 ap->hsm_task_state = HSM_ST_ERR;
3722 * ata_pio_block - start PIO on a block
3723 * @ap: the target ata_port
3726 * None. (executing in kernel thread context)
3729 static void ata_pio_block(struct ata_port *ap)
3731 struct ata_queued_cmd *qc;
3735 * This is purely heuristic. This is a fast path.
3736 * Sometimes when we enter, BSY will be cleared in
3737 * a chk-status or two. If not, the drive is probably seeking
3738 * or something. Snooze for a couple msecs, then
3739 * chk-status again. If still busy, fall back to
3740 * HSM_ST_POLL state.
3742 status = ata_busy_wait(ap, ATA_BUSY, 5);
3743 if (status & ATA_BUSY) {
3745 status = ata_busy_wait(ap, ATA_BUSY, 10);
3746 if (status & ATA_BUSY) {
3747 ap->hsm_task_state = HSM_ST_POLL;
3748 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3753 qc = ata_qc_from_tag(ap, ap->active_tag);
3754 WARN_ON(qc == NULL);
3757 if (status & (ATA_ERR | ATA_DF)) {
3758 qc->err_mask |= AC_ERR_DEV;
3759 ap->hsm_task_state = HSM_ST_ERR;
3763 /* transfer data if any */
3764 if (is_atapi_taskfile(&qc->tf)) {
3765 /* DRQ=0 means no more data to transfer */
3766 if ((status & ATA_DRQ) == 0) {
3767 ap->hsm_task_state = HSM_ST_LAST;
3771 atapi_pio_bytes(qc);
3773 /* handle BSY=0, DRQ=0 as error */
3774 if ((status & ATA_DRQ) == 0) {
3775 qc->err_mask |= AC_ERR_HSM;
3776 ap->hsm_task_state = HSM_ST_ERR;
3780 ata_pio_sectors(qc);
3783 ata_altstatus(ap); /* flush */
3786 static void ata_pio_error(struct ata_port *ap)
3788 struct ata_queued_cmd *qc;
3790 qc = ata_qc_from_tag(ap, ap->active_tag);
3791 WARN_ON(qc == NULL);
3793 if (qc->tf.command != ATA_CMD_PACKET)
3794 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3796 /* make sure qc->err_mask is available to
3797 * know what's wrong and recover
3799 WARN_ON(qc->err_mask == 0);
3801 ap->hsm_task_state = HSM_ST_IDLE;
3803 ata_poll_qc_complete(qc);
3806 static void ata_pio_task(void *_data)
3808 struct ata_port *ap = _data;
3809 unsigned long timeout;
3816 switch (ap->hsm_task_state) {
3818 has_next = ata_pio_first_block(ap);
3826 has_next = ata_pio_complete(ap);
3830 case HSM_ST_LAST_POLL:
3831 timeout = ata_pio_poll(ap);
3845 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3851 * atapi_packet_task - Write CDB bytes to hardware
3852 * @_data: Port to which ATAPI device is attached.
3854 * When device has indicated its readiness to accept
3855 * a CDB, this function is called. Send the CDB.
3856 * If DMA is to be performed, exit immediately.
3857 * Otherwise, we are in polling mode, so poll
3858 * status under operation succeeds or fails.
3861 * Kernel thread context (may sleep)
3864 static void atapi_packet_task(void *_data)
3866 struct ata_port *ap = _data;
3867 struct ata_queued_cmd *qc;
3870 qc = ata_qc_from_tag(ap, ap->active_tag);
3871 WARN_ON(qc == NULL);
3872 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3874 /* sleep-wait for BSY to clear */
3875 DPRINTK("busy wait\n");
3876 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3877 qc->err_mask |= AC_ERR_TIMEOUT;
3881 /* make sure DRQ is set */
3882 status = ata_chk_status(ap);
3883 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3884 qc->err_mask |= AC_ERR_HSM;
3889 DPRINTK("send cdb\n");
3890 WARN_ON(qc->dev->cdb_len < 12);
3892 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3893 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3894 unsigned long flags;
3896 /* Once we're done issuing command and kicking bmdma,
3897 * irq handler takes over. To not lose irq, we need
3898 * to clear NOINTR flag before sending cdb, but
3899 * interrupt handler shouldn't be invoked before we're
3900 * finished. Hence, the following locking.
3902 spin_lock_irqsave(&ap->host_set->lock, flags);
3904 /* ap->flags &= ~ATA_FLAG_NOINTR; */
3905 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3906 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3907 ap->ops->bmdma_start(qc); /* initiate bmdma */
3908 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3910 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3912 /* PIO commands are handled by polling */
3913 ap->hsm_task_state = HSM_ST;
3914 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3920 ata_poll_qc_complete(qc);
3924 * ata_qc_timeout - Handle timeout of queued command
3925 * @qc: Command that timed out
3927 * Some part of the kernel (currently, only the SCSI layer)
3928 * has noticed that the active command on port @ap has not
3929 * completed after a specified length of time. Handle this
3930 * condition by disabling DMA (if necessary) and completing
3931 * transactions, with error if necessary.
3933 * This also handles the case of the "lost interrupt", where
3934 * for some reason (possibly hardware bug, possibly driver bug)
3935 * an interrupt was not delivered to the driver, even though the
3936 * transaction completed successfully.
3939 * Inherited from SCSI layer (none, can sleep)
3942 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3944 struct ata_port *ap = qc->ap;
3945 struct ata_host_set *host_set = ap->host_set;
3946 u8 host_stat = 0, drv_stat;
3947 unsigned long flags;
3951 ap->hsm_task_state = HSM_ST_IDLE;
3953 spin_lock_irqsave(&host_set->lock, flags);
3955 switch (qc->tf.protocol) {
3958 case ATA_PROT_ATAPI_DMA:
3959 host_stat = ap->ops->bmdma_status(ap);
3961 /* before we do anything else, clear DMA-Start bit */
3962 ap->ops->bmdma_stop(qc);
3968 drv_stat = ata_chk_status(ap);
3970 /* ack bmdma irq events */
3971 ap->ops->irq_clear(ap);
3973 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3974 ap->id, qc->tf.command, drv_stat, host_stat);
3976 ap->hsm_task_state = HSM_ST_IDLE;
3978 /* complete taskfile transaction */
3979 qc->err_mask |= AC_ERR_TIMEOUT;
3983 spin_unlock_irqrestore(&host_set->lock, flags);
3985 ata_eh_qc_complete(qc);
3991 * ata_eng_timeout - Handle timeout of queued command
3992 * @ap: Port on which timed-out command is active
3994 * Some part of the kernel (currently, only the SCSI layer)
3995 * has noticed that the active command on port @ap has not
3996 * completed after a specified length of time. Handle this
3997 * condition by disabling DMA (if necessary) and completing
3998 * transactions, with error if necessary.
4000 * This also handles the case of the "lost interrupt", where
4001 * for some reason (possibly hardware bug, possibly driver bug)
4002 * an interrupt was not delivered to the driver, even though the
4003 * transaction completed successfully.
4006 * Inherited from SCSI layer (none, can sleep)
4009 void ata_eng_timeout(struct ata_port *ap)
4013 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
4019 * ata_qc_new - Request an available ATA command, for queueing
4020 * @ap: Port associated with device @dev
4021 * @dev: Device from whom we request an available command structure
4027 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4029 struct ata_queued_cmd *qc = NULL;
4032 for (i = 0; i < ATA_MAX_QUEUE; i++)
4033 if (!test_and_set_bit(i, &ap->qactive)) {
4034 qc = ata_qc_from_tag(ap, i);
4045 * ata_qc_new_init - Request an available ATA command, and initialize it
4046 * @ap: Port associated with device @dev
4047 * @dev: Device from whom we request an available command structure
4053 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
4054 struct ata_device *dev)
4056 struct ata_queued_cmd *qc;
4058 qc = ata_qc_new(ap);
4071 * ata_qc_free - free unused ata_queued_cmd
4072 * @qc: Command to complete
4074 * Designed to free unused ata_queued_cmd object
4075 * in case something prevents using it.
4078 * spin_lock_irqsave(host_set lock)
4080 void ata_qc_free(struct ata_queued_cmd *qc)
4082 struct ata_port *ap = qc->ap;
4085 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4089 if (likely(ata_tag_valid(tag))) {
4090 if (tag == ap->active_tag)
4091 ap->active_tag = ATA_TAG_POISON;
4092 qc->tag = ATA_TAG_POISON;
4093 clear_bit(tag, &ap->qactive);
4097 void __ata_qc_complete(struct ata_queued_cmd *qc)
4099 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4100 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4102 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4105 /* atapi: mark qc as inactive to prevent the interrupt handler
4106 * from completing the command twice later, before the error handler
4107 * is called. (when rc != 0 and atapi request sense is needed)
4109 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4111 /* call completion callback */
4112 qc->complete_fn(qc);
4115 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4117 struct ata_port *ap = qc->ap;
4119 switch (qc->tf.protocol) {
4121 case ATA_PROT_ATAPI_DMA:
4124 case ATA_PROT_ATAPI:
4126 if (ap->flags & ATA_FLAG_PIO_DMA)
4139 * ata_qc_issue - issue taskfile to device
4140 * @qc: command to issue to device
4142 * Prepare an ATA command to submission to device.
4143 * This includes mapping the data into a DMA-able
4144 * area, filling in the S/G table, and finally
4145 * writing the taskfile to hardware, starting the command.
4148 * spin_lock_irqsave(host_set lock)
4151 * Zero on success, AC_ERR_* mask on failure
4154 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
4156 struct ata_port *ap = qc->ap;
4158 if (ata_should_dma_map(qc)) {
4159 if (qc->flags & ATA_QCFLAG_SG) {
4160 if (ata_sg_setup(qc))
4162 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4163 if (ata_sg_setup_one(qc))
4167 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4170 ap->ops->qc_prep(qc);
4172 qc->ap->active_tag = qc->tag;
4173 qc->flags |= ATA_QCFLAG_ACTIVE;
4175 return ap->ops->qc_issue(qc);
4178 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4179 return AC_ERR_SYSTEM;
4184 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4185 * @qc: command to issue to device
4187 * Using various libata functions and hooks, this function
4188 * starts an ATA command. ATA commands are grouped into
4189 * classes called "protocols", and issuing each type of protocol
4190 * is slightly different.
4192 * May be used as the qc_issue() entry in ata_port_operations.
4195 * spin_lock_irqsave(host_set lock)
4198 * Zero on success, AC_ERR_* mask on failure
4201 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4203 struct ata_port *ap = qc->ap;
4205 /* Use polling pio if the LLD doesn't handle
4206 * interrupt driven pio and atapi CDB interrupt.
4208 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4209 switch (qc->tf.protocol) {
4211 case ATA_PROT_ATAPI:
4212 case ATA_PROT_ATAPI_NODATA:
4213 qc->tf.flags |= ATA_TFLAG_POLLING;
4215 case ATA_PROT_ATAPI_DMA:
4216 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
4224 /* select the device */
4225 ata_dev_select(ap, qc->dev->devno, 1, 0);
4227 /* start the command */
4228 switch (qc->tf.protocol) {
4229 case ATA_PROT_NODATA:
4230 if (qc->tf.flags & ATA_TFLAG_POLLING)
4231 ata_qc_set_polling(qc);
4233 ata_tf_to_host(ap, &qc->tf);
4234 ap->hsm_task_state = HSM_ST_LAST;
4236 if (qc->tf.flags & ATA_TFLAG_POLLING)
4237 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4242 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4244 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4245 ap->ops->bmdma_setup(qc); /* set up bmdma */
4246 ap->ops->bmdma_start(qc); /* initiate bmdma */
4247 ap->hsm_task_state = HSM_ST_LAST;
4251 if (qc->tf.flags & ATA_TFLAG_POLLING)
4252 ata_qc_set_polling(qc);
4254 ata_tf_to_host(ap, &qc->tf);
4256 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4257 /* PIO data out protocol */
4258 ap->hsm_task_state = HSM_ST_FIRST;
4259 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4261 /* always send first data block using
4262 * the ata_pio_task() codepath.
4265 /* PIO data in protocol */
4266 ap->hsm_task_state = HSM_ST;
4268 if (qc->tf.flags & ATA_TFLAG_POLLING)
4269 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4271 /* if polling, ata_pio_task() handles the rest.
4272 * otherwise, interrupt handler takes over from here.
4278 case ATA_PROT_ATAPI:
4279 case ATA_PROT_ATAPI_NODATA:
4280 if (qc->tf.flags & ATA_TFLAG_POLLING)
4281 ata_qc_set_polling(qc);
4283 ata_tf_to_host(ap, &qc->tf);
4285 ap->hsm_task_state = HSM_ST_FIRST;
4287 /* send cdb by polling if no cdb interrupt */
4288 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4289 (qc->tf.flags & ATA_TFLAG_POLLING))
4290 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4293 case ATA_PROT_ATAPI_DMA:
4294 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4296 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4297 ap->ops->bmdma_setup(qc); /* set up bmdma */
4298 ap->hsm_task_state = HSM_ST_FIRST;
4300 /* send cdb by polling if no cdb interrupt */
4301 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4302 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4307 return AC_ERR_SYSTEM;
4314 * ata_host_intr - Handle host interrupt for given (port, task)
4315 * @ap: Port on which interrupt arrived (possibly...)
4316 * @qc: Taskfile currently active in engine
4318 * Handle host interrupt for given queued command. Currently,
4319 * only DMA interrupts are handled. All other commands are
4320 * handled via polling with interrupts disabled (nIEN bit).
4323 * spin_lock_irqsave(host_set lock)
4326 * One if interrupt was handled, zero if not (shared irq).
4329 inline unsigned int ata_host_intr (struct ata_port *ap,
4330 struct ata_queued_cmd *qc)
4332 u8 status, host_stat = 0;
4334 VPRINTK("ata%u: protocol %d task_state %d\n",
4335 ap->id, qc->tf.protocol, ap->hsm_task_state);
4337 /* Check whether we are expecting interrupt in this state */
4338 switch (ap->hsm_task_state) {
4340 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4341 * The flag was turned on only for atapi devices.
4342 * No need to check is_atapi_taskfile(&qc->tf) again.
4344 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4348 if (qc->tf.protocol == ATA_PROT_DMA ||
4349 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4350 /* check status of DMA engine */
4351 host_stat = ap->ops->bmdma_status(ap);
4352 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4354 /* if it's not our irq... */
4355 if (!(host_stat & ATA_DMA_INTR))
4358 /* before we do anything else, clear DMA-Start bit */
4359 ap->ops->bmdma_stop(qc);
4361 if (unlikely(host_stat & ATA_DMA_ERR)) {
4362 /* error when transfering data to/from memory */
4363 qc->err_mask |= AC_ERR_HOST_BUS;
4364 ap->hsm_task_state = HSM_ST_ERR;
4374 /* check altstatus */
4375 status = ata_altstatus(ap);
4376 if (status & ATA_BUSY)
4379 /* check main status, clearing INTRQ */
4380 status = ata_chk_status(ap);
4381 if (unlikely(status & ATA_BUSY))
4384 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4385 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
4387 /* ack bmdma irq events */
4388 ap->ops->irq_clear(ap);
4391 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4392 qc->err_mask |= AC_ERR_DEV;
4393 ap->hsm_task_state = HSM_ST_ERR;
4397 switch (ap->hsm_task_state) {
4399 /* Some pre-ATAPI-4 devices assert INTRQ
4400 * at this state when ready to receive CDB.
4403 /* check device status */
4404 if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
4405 /* Wrong status. Let EH handle this */
4406 qc->err_mask |= AC_ERR_HSM;
4407 ap->hsm_task_state = HSM_ST_ERR;
4411 atapi_send_cdb(ap, qc);
4416 /* complete command or read/write the data register */
4417 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4418 /* ATAPI PIO protocol */
4419 if ((status & ATA_DRQ) == 0) {
4420 /* no more data to transfer */
4421 ap->hsm_task_state = HSM_ST_LAST;
4425 atapi_pio_bytes(qc);
4427 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4428 /* bad ireason reported by device */
4432 /* ATA PIO protocol */
4433 if (unlikely((status & ATA_DRQ) == 0)) {
4434 /* handle BSY=0, DRQ=0 as error */
4435 qc->err_mask |= AC_ERR_HSM;
4436 ap->hsm_task_state = HSM_ST_ERR;
4440 ata_pio_sectors(qc);
4442 if (ap->hsm_task_state == HSM_ST_LAST &&
4443 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4446 status = ata_chk_status(ap);
4451 ata_altstatus(ap); /* flush */
4455 if (unlikely(status & ATA_DRQ)) {
4456 /* handle DRQ=1 as error */
4457 qc->err_mask |= AC_ERR_HSM;
4458 ap->hsm_task_state = HSM_ST_ERR;
4462 /* no more data to transfer */
4463 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
4466 ap->hsm_task_state = HSM_ST_IDLE;
4468 /* complete taskfile transaction */
4469 qc->err_mask |= ac_err_mask(status);
4470 ata_qc_complete(qc);
4474 if (qc->tf.command != ATA_CMD_PACKET)
4475 printk(KERN_ERR "ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
4476 ap->id, status, host_stat);
4478 /* make sure qc->err_mask is available to
4479 * know what's wrong and recover
4481 WARN_ON(qc->err_mask == 0);
4483 ap->hsm_task_state = HSM_ST_IDLE;
4484 ata_qc_complete(qc);
4490 return 1; /* irq handled */
4493 ap->stats.idle_irq++;
4496 if ((ap->stats.idle_irq % 1000) == 0) {
4497 ata_irq_ack(ap, 0); /* debug trap */
4498 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4502 return 0; /* irq not handled */
4506 * ata_interrupt - Default ATA host interrupt handler
4507 * @irq: irq line (unused)
4508 * @dev_instance: pointer to our ata_host_set information structure
4511 * Default interrupt handler for PCI IDE devices. Calls
4512 * ata_host_intr() for each port that is not disabled.
4515 * Obtains host_set lock during operation.
4518 * IRQ_NONE or IRQ_HANDLED.
4521 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4523 struct ata_host_set *host_set = dev_instance;
4525 unsigned int handled = 0;
4526 unsigned long flags;
4528 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4529 spin_lock_irqsave(&host_set->lock, flags);
4531 for (i = 0; i < host_set->n_ports; i++) {
4532 struct ata_port *ap;
4534 ap = host_set->ports[i];
4536 !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
4537 struct ata_queued_cmd *qc;
4539 qc = ata_qc_from_tag(ap, ap->active_tag);
4540 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
4541 (qc->flags & ATA_QCFLAG_ACTIVE))
4542 handled |= ata_host_intr(ap, qc);
4546 spin_unlock_irqrestore(&host_set->lock, flags);
4548 return IRQ_RETVAL(handled);
4553 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4554 * without filling any other registers
4556 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4559 struct ata_taskfile tf;
4562 ata_tf_init(ap, &tf, dev->devno);
4565 tf.flags |= ATA_TFLAG_DEVICE;
4566 tf.protocol = ATA_PROT_NODATA;
4568 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4570 printk(KERN_ERR "%s: ata command failed: %d\n",
4576 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4580 if (!ata_try_flush_cache(dev))
4583 if (ata_id_has_flush_ext(dev->id))
4584 cmd = ATA_CMD_FLUSH_EXT;
4586 cmd = ATA_CMD_FLUSH;
4588 return ata_do_simple_cmd(ap, dev, cmd);
4591 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4593 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4596 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4598 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4602 * ata_device_resume - wakeup a previously suspended devices
4603 * @ap: port the device is connected to
4604 * @dev: the device to resume
4606 * Kick the drive back into action, by sending it an idle immediate
4607 * command and making sure its transfer mode matches between drive
4611 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4613 if (ap->flags & ATA_FLAG_SUSPENDED) {
4614 ap->flags &= ~ATA_FLAG_SUSPENDED;
4617 if (!ata_dev_present(dev))
4619 if (dev->class == ATA_DEV_ATA)
4620 ata_start_drive(ap, dev);
4626 * ata_device_suspend - prepare a device for suspend
4627 * @ap: port the device is connected to
4628 * @dev: the device to suspend
4630 * Flush the cache on the drive, if appropriate, then issue a
4631 * standbynow command.
4633 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4635 if (!ata_dev_present(dev))
4637 if (dev->class == ATA_DEV_ATA)
4638 ata_flush_cache(ap, dev);
4640 ata_standby_drive(ap, dev);
4641 ap->flags |= ATA_FLAG_SUSPENDED;
4646 * ata_port_start - Set port up for dma.
4647 * @ap: Port to initialize
4649 * Called just after data structures for each port are
4650 * initialized. Allocates space for PRD table.
4652 * May be used as the port_start() entry in ata_port_operations.
4655 * Inherited from caller.
4658 int ata_port_start (struct ata_port *ap)
4660 struct device *dev = ap->host_set->dev;
4663 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4667 rc = ata_pad_alloc(ap, dev);
4669 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4673 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4680 * ata_port_stop - Undo ata_port_start()
4681 * @ap: Port to shut down
4683 * Frees the PRD table.
4685 * May be used as the port_stop() entry in ata_port_operations.
4688 * Inherited from caller.
4691 void ata_port_stop (struct ata_port *ap)
4693 struct device *dev = ap->host_set->dev;
4695 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4696 ata_pad_free(ap, dev);
4699 void ata_host_stop (struct ata_host_set *host_set)
4701 if (host_set->mmio_base)
4702 iounmap(host_set->mmio_base);
4707 * ata_host_remove - Unregister SCSI host structure with upper layers
4708 * @ap: Port to unregister
4709 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4712 * Inherited from caller.
4715 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4717 struct Scsi_Host *sh = ap->host;
4722 scsi_remove_host(sh);
4724 ap->ops->port_stop(ap);
4728 * ata_host_init - Initialize an ata_port structure
4729 * @ap: Structure to initialize
4730 * @host: associated SCSI mid-layer structure
4731 * @host_set: Collection of hosts to which @ap belongs
4732 * @ent: Probe information provided by low-level driver
4733 * @port_no: Port number associated with this ata_port
4735 * Initialize a new ata_port structure, and its associated
4739 * Inherited from caller.
4742 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4743 struct ata_host_set *host_set,
4744 const struct ata_probe_ent *ent, unsigned int port_no)
4750 host->max_channel = 1;
4751 host->unique_id = ata_unique_id++;
4752 host->max_cmd_len = 12;
4754 ap->flags = ATA_FLAG_PORT_DISABLED;
4755 ap->id = host->unique_id;
4757 ap->ctl = ATA_DEVCTL_OBS;
4758 ap->host_set = host_set;
4759 ap->port_no = port_no;
4761 ent->legacy_mode ? ent->hard_port_no : port_no;
4762 ap->pio_mask = ent->pio_mask;
4763 ap->mwdma_mask = ent->mwdma_mask;
4764 ap->udma_mask = ent->udma_mask;
4765 ap->flags |= ent->host_flags;
4766 ap->ops = ent->port_ops;
4767 ap->cbl = ATA_CBL_NONE;
4768 ap->active_tag = ATA_TAG_POISON;
4769 ap->last_ctl = 0xFF;
4771 INIT_WORK(&ap->port_task, NULL, NULL);
4772 INIT_LIST_HEAD(&ap->eh_done_q);
4774 for (i = 0; i < ATA_MAX_DEVICES; i++)
4775 ap->device[i].devno = i;
4778 ap->stats.unhandled_irq = 1;
4779 ap->stats.idle_irq = 1;
4782 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4786 * ata_host_add - Attach low-level ATA driver to system
4787 * @ent: Information provided by low-level driver
4788 * @host_set: Collections of ports to which we add
4789 * @port_no: Port number associated with this host
4791 * Attach low-level ATA driver to system.
4794 * PCI/etc. bus probe sem.
4797 * New ata_port on success, for NULL on error.
4800 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4801 struct ata_host_set *host_set,
4802 unsigned int port_no)
4804 struct Scsi_Host *host;
4805 struct ata_port *ap;
4809 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4813 host->transportt = &ata_scsi_transport_template;
4815 ap = (struct ata_port *) &host->hostdata[0];
4817 ata_host_init(ap, host, host_set, ent, port_no);
4819 rc = ap->ops->port_start(ap);
4826 scsi_host_put(host);
4831 * ata_device_add - Register hardware device with ATA and SCSI layers
4832 * @ent: Probe information describing hardware device to be registered
4834 * This function processes the information provided in the probe
4835 * information struct @ent, allocates the necessary ATA and SCSI
4836 * host information structures, initializes them, and registers
4837 * everything with requisite kernel subsystems.
4839 * This function requests irqs, probes the ATA bus, and probes
4843 * PCI/etc. bus probe sem.
4846 * Number of ports registered. Zero on error (no ports registered).
4849 int ata_device_add(const struct ata_probe_ent *ent)
4851 unsigned int count = 0, i;
4852 struct device *dev = ent->dev;
4853 struct ata_host_set *host_set;
4856 /* alloc a container for our list of ATA ports (buses) */
4857 host_set = kzalloc(sizeof(struct ata_host_set) +
4858 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4861 spin_lock_init(&host_set->lock);
4863 host_set->dev = dev;
4864 host_set->n_ports = ent->n_ports;
4865 host_set->irq = ent->irq;
4866 host_set->mmio_base = ent->mmio_base;
4867 host_set->private_data = ent->private_data;
4868 host_set->ops = ent->port_ops;
4870 /* register each port bound to this device */
4871 for (i = 0; i < ent->n_ports; i++) {
4872 struct ata_port *ap;
4873 unsigned long xfer_mode_mask;
4875 ap = ata_host_add(ent, host_set, i);
4879 host_set->ports[i] = ap;
4880 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4881 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4882 (ap->pio_mask << ATA_SHIFT_PIO);
4884 /* print per-port info to dmesg */
4885 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4886 "bmdma 0x%lX irq %lu\n",
4888 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4889 ata_mode_string(xfer_mode_mask),
4890 ap->ioaddr.cmd_addr,
4891 ap->ioaddr.ctl_addr,
4892 ap->ioaddr.bmdma_addr,
4896 host_set->ops->irq_clear(ap);
4903 /* obtain irq, that is shared between channels */
4904 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4905 DRV_NAME, host_set))
4908 /* perform each probe synchronously */
4909 DPRINTK("probe begin\n");
4910 for (i = 0; i < count; i++) {
4911 struct ata_port *ap;
4914 ap = host_set->ports[i];
4916 DPRINTK("ata%u: bus probe begin\n", ap->id);
4917 rc = ata_bus_probe(ap);
4918 DPRINTK("ata%u: bus probe end\n", ap->id);
4921 /* FIXME: do something useful here?
4922 * Current libata behavior will
4923 * tear down everything when
4924 * the module is removed
4925 * or the h/w is unplugged.
4929 rc = scsi_add_host(ap->host, dev);
4931 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4933 /* FIXME: do something useful here */
4934 /* FIXME: handle unconditional calls to
4935 * scsi_scan_host and ata_host_remove, below,
4941 /* probes are done, now scan each port's disk(s) */
4942 DPRINTK("host probe begin\n");
4943 for (i = 0; i < count; i++) {
4944 struct ata_port *ap = host_set->ports[i];
4946 ata_scsi_scan_host(ap);
4949 dev_set_drvdata(dev, host_set);
4951 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4952 return ent->n_ports; /* success */
4955 for (i = 0; i < count; i++) {
4956 ata_host_remove(host_set->ports[i], 1);
4957 scsi_host_put(host_set->ports[i]->host);
4961 VPRINTK("EXIT, returning 0\n");
4966 * ata_host_set_remove - PCI layer callback for device removal
4967 * @host_set: ATA host set that was removed
4969 * Unregister all objects associated with this host set. Free those
4973 * Inherited from calling layer (may sleep).
4976 void ata_host_set_remove(struct ata_host_set *host_set)
4978 struct ata_port *ap;
4981 for (i = 0; i < host_set->n_ports; i++) {
4982 ap = host_set->ports[i];
4983 scsi_remove_host(ap->host);
4986 free_irq(host_set->irq, host_set);
4988 for (i = 0; i < host_set->n_ports; i++) {
4989 ap = host_set->ports[i];
4991 ata_scsi_release(ap->host);
4993 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4994 struct ata_ioports *ioaddr = &ap->ioaddr;
4996 if (ioaddr->cmd_addr == 0x1f0)
4997 release_region(0x1f0, 8);
4998 else if (ioaddr->cmd_addr == 0x170)
4999 release_region(0x170, 8);
5002 scsi_host_put(ap->host);
5005 if (host_set->ops->host_stop)
5006 host_set->ops->host_stop(host_set);
5012 * ata_scsi_release - SCSI layer callback hook for host unload
5013 * @host: libata host to be unloaded
5015 * Performs all duties necessary to shut down a libata port...
5016 * Kill port kthread, disable port, and release resources.
5019 * Inherited from SCSI layer.
5025 int ata_scsi_release(struct Scsi_Host *host)
5027 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
5032 ap->ops->port_disable(ap);
5033 ata_host_remove(ap, 0);
5034 for (i = 0; i < ATA_MAX_DEVICES; i++)
5035 kfree(ap->device[i].id);
5042 * ata_std_ports - initialize ioaddr with standard port offsets.
5043 * @ioaddr: IO address structure to be initialized
5045 * Utility function which initializes data_addr, error_addr,
5046 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5047 * device_addr, status_addr, and command_addr to standard offsets
5048 * relative to cmd_addr.
5050 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5053 void ata_std_ports(struct ata_ioports *ioaddr)
5055 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5056 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5057 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5058 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5059 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5060 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5061 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5062 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5063 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5064 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5070 void ata_pci_host_stop (struct ata_host_set *host_set)
5072 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5074 pci_iounmap(pdev, host_set->mmio_base);
5078 * ata_pci_remove_one - PCI layer callback for device removal
5079 * @pdev: PCI device that was removed
5081 * PCI layer indicates to libata via this hook that
5082 * hot-unplug or module unload event has occurred.
5083 * Handle this by unregistering all objects associated
5084 * with this PCI device. Free those objects. Then finally
5085 * release PCI resources and disable device.
5088 * Inherited from PCI layer (may sleep).
5091 void ata_pci_remove_one (struct pci_dev *pdev)
5093 struct device *dev = pci_dev_to_dev(pdev);
5094 struct ata_host_set *host_set = dev_get_drvdata(dev);
5096 ata_host_set_remove(host_set);
5097 pci_release_regions(pdev);
5098 pci_disable_device(pdev);
5099 dev_set_drvdata(dev, NULL);
5102 /* move to PCI subsystem */
5103 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5105 unsigned long tmp = 0;
5107 switch (bits->width) {
5110 pci_read_config_byte(pdev, bits->reg, &tmp8);
5116 pci_read_config_word(pdev, bits->reg, &tmp16);
5122 pci_read_config_dword(pdev, bits->reg, &tmp32);
5133 return (tmp == bits->val) ? 1 : 0;
5136 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5138 pci_save_state(pdev);
5139 pci_disable_device(pdev);
5140 pci_set_power_state(pdev, PCI_D3hot);
5144 int ata_pci_device_resume(struct pci_dev *pdev)
5146 pci_set_power_state(pdev, PCI_D0);
5147 pci_restore_state(pdev);
5148 pci_enable_device(pdev);
5149 pci_set_master(pdev);
5152 #endif /* CONFIG_PCI */
5155 static int __init ata_init(void)
5157 ata_wq = create_workqueue("ata");
5161 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5165 static void __exit ata_exit(void)
5167 destroy_workqueue(ata_wq);
5170 module_init(ata_init);
5171 module_exit(ata_exit);
5173 static unsigned long ratelimit_time;
5174 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5176 int ata_ratelimit(void)
5179 unsigned long flags;
5181 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5183 if (time_after(jiffies, ratelimit_time)) {
5185 ratelimit_time = jiffies + (HZ/5);
5189 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5195 * libata is essentially a library of internal helper functions for
5196 * low-level ATA host controller drivers. As such, the API/ABI is
5197 * likely to change as new drivers are added and updated.
5198 * Do not depend on ABI/API stability.
5201 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5202 EXPORT_SYMBOL_GPL(ata_std_ports);
5203 EXPORT_SYMBOL_GPL(ata_device_add);
5204 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5205 EXPORT_SYMBOL_GPL(ata_sg_init);
5206 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5207 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5208 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5209 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5210 EXPORT_SYMBOL_GPL(ata_tf_load);
5211 EXPORT_SYMBOL_GPL(ata_tf_read);
5212 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5213 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5214 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5215 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5216 EXPORT_SYMBOL_GPL(ata_check_status);
5217 EXPORT_SYMBOL_GPL(ata_altstatus);
5218 EXPORT_SYMBOL_GPL(ata_exec_command);
5219 EXPORT_SYMBOL_GPL(ata_port_start);
5220 EXPORT_SYMBOL_GPL(ata_port_stop);
5221 EXPORT_SYMBOL_GPL(ata_host_stop);
5222 EXPORT_SYMBOL_GPL(ata_interrupt);
5223 EXPORT_SYMBOL_GPL(ata_qc_prep);
5224 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5225 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5226 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5227 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5228 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5229 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5230 EXPORT_SYMBOL_GPL(ata_port_probe);
5231 EXPORT_SYMBOL_GPL(sata_phy_reset);
5232 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5233 EXPORT_SYMBOL_GPL(ata_bus_reset);
5234 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5235 EXPORT_SYMBOL_GPL(ata_std_softreset);
5236 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5237 EXPORT_SYMBOL_GPL(ata_std_postreset);
5238 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5239 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5240 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5241 EXPORT_SYMBOL_GPL(ata_port_disable);
5242 EXPORT_SYMBOL_GPL(ata_ratelimit);
5243 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5244 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5245 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5246 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5247 EXPORT_SYMBOL_GPL(ata_scsi_error);
5248 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5249 EXPORT_SYMBOL_GPL(ata_scsi_release);
5250 EXPORT_SYMBOL_GPL(ata_host_intr);
5251 EXPORT_SYMBOL_GPL(ata_dev_classify);
5252 EXPORT_SYMBOL_GPL(ata_id_string);
5253 EXPORT_SYMBOL_GPL(ata_id_c_string);
5254 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5255 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5256 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5258 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5259 EXPORT_SYMBOL_GPL(ata_timing_compute);
5260 EXPORT_SYMBOL_GPL(ata_timing_merge);
5263 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5264 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5265 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5266 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5267 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5268 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5269 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5270 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5271 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5272 #endif /* CONFIG_PCI */
5274 EXPORT_SYMBOL_GPL(ata_device_suspend);
5275 EXPORT_SYMBOL_GPL(ata_device_resume);
5276 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5277 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);