2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port *ap,
65 struct ata_device *dev,
68 static int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev);
69 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
70 struct ata_device *dev);
71 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
73 static unsigned int ata_unique_id = 1;
74 static struct workqueue_struct *ata_wq;
76 int atapi_enabled = 1;
77 module_param(atapi_enabled, int, 0444);
78 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 module_param_named(fua, libata_fua, int, 0444);
82 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
105 fis[0] = 0x27; /* Register - Host to Device FIS */
106 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis[2] = tf->command;
109 fis[3] = tf->feature;
116 fis[8] = tf->hob_lbal;
117 fis[9] = tf->hob_lbam;
118 fis[10] = tf->hob_lbah;
119 fis[11] = tf->hob_feature;
122 fis[13] = tf->hob_nsect;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
145 tf->command = fis[2]; /* status */
146 tf->feature = fis[3]; /* error */
153 tf->hob_lbal = fis[8];
154 tf->hob_lbam = fis[9];
155 tf->hob_lbah = fis[10];
158 tf->hob_nsect = fis[13];
161 static const u8 ata_rw_cmds[] = {
165 ATA_CMD_READ_MULTI_EXT,
166 ATA_CMD_WRITE_MULTI_EXT,
170 ATA_CMD_WRITE_MULTI_FUA_EXT,
174 ATA_CMD_PIO_READ_EXT,
175 ATA_CMD_PIO_WRITE_EXT,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
203 struct ata_taskfile *tf = &qc->tf;
204 struct ata_device *dev = qc->dev;
207 int index, fua, lba48, write;
209 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
210 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
211 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
213 if (dev->flags & ATA_DFLAG_PIO) {
214 tf->protocol = ATA_PROT_PIO;
215 index = dev->multi_count ? 0 : 8;
216 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
217 /* Unable to use DMA due to host limitation */
218 tf->protocol = ATA_PROT_PIO;
219 index = dev->multi_count ? 0 : 8;
221 tf->protocol = ATA_PROT_DMA;
225 cmd = ata_rw_cmds[index + fua + lba48 + write];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
249 unsigned int mwdma_mask,
250 unsigned int udma_mask)
252 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
253 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
254 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask,
268 unsigned int *pio_mask,
269 unsigned int *mwdma_mask,
270 unsigned int *udma_mask)
273 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
275 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
277 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
280 static const struct ata_xfer_ent {
284 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
285 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
286 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
305 int highbit = fls(xfer_mask) - 1;
306 const struct ata_xfer_ent *ent;
308 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
309 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
310 return ent->base + highbit - ent->shift;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
328 const struct ata_xfer_ent *ent;
330 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
331 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
332 return 1 << (ent->shift + xfer_mode - ent->base);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode)
350 const struct ata_xfer_ent *ent;
352 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
353 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask)
374 static const char * const xfer_mode_str[] = {
394 highbit = fls(xfer_mask) - 1;
395 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
396 return xfer_mode_str[highbit];
400 static const char *sata_spd_string(unsigned int spd)
402 static const char * const spd_str[] = {
407 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
409 return spd_str[spd - 1];
412 static void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
414 if (ata_dev_enabled(dev)) {
415 printk(KERN_WARNING "ata%u: dev %u disabled\n",
422 * ata_pio_devchk - PATA device presence detection
423 * @ap: ATA channel to examine
424 * @device: Device to examine (starting at zero)
426 * This technique was originally described in
427 * Hale Landis's ATADRVR (www.ata-atapi.com), and
428 * later found its way into the ATA/ATAPI spec.
430 * Write a pattern to the ATA shadow registers,
431 * and if a device is present, it will respond by
432 * correctly storing and echoing back the
433 * ATA shadow register contents.
439 static unsigned int ata_pio_devchk(struct ata_port *ap,
442 struct ata_ioports *ioaddr = &ap->ioaddr;
445 ap->ops->dev_select(ap, device);
447 outb(0x55, ioaddr->nsect_addr);
448 outb(0xaa, ioaddr->lbal_addr);
450 outb(0xaa, ioaddr->nsect_addr);
451 outb(0x55, ioaddr->lbal_addr);
453 outb(0x55, ioaddr->nsect_addr);
454 outb(0xaa, ioaddr->lbal_addr);
456 nsect = inb(ioaddr->nsect_addr);
457 lbal = inb(ioaddr->lbal_addr);
459 if ((nsect == 0x55) && (lbal == 0xaa))
460 return 1; /* we found a device */
462 return 0; /* nothing found */
466 * ata_mmio_devchk - PATA device presence detection
467 * @ap: ATA channel to examine
468 * @device: Device to examine (starting at zero)
470 * This technique was originally described in
471 * Hale Landis's ATADRVR (www.ata-atapi.com), and
472 * later found its way into the ATA/ATAPI spec.
474 * Write a pattern to the ATA shadow registers,
475 * and if a device is present, it will respond by
476 * correctly storing and echoing back the
477 * ATA shadow register contents.
483 static unsigned int ata_mmio_devchk(struct ata_port *ap,
486 struct ata_ioports *ioaddr = &ap->ioaddr;
489 ap->ops->dev_select(ap, device);
491 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
492 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
494 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
495 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
497 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
498 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
500 nsect = readb((void __iomem *) ioaddr->nsect_addr);
501 lbal = readb((void __iomem *) ioaddr->lbal_addr);
503 if ((nsect == 0x55) && (lbal == 0xaa))
504 return 1; /* we found a device */
506 return 0; /* nothing found */
510 * ata_devchk - PATA device presence detection
511 * @ap: ATA channel to examine
512 * @device: Device to examine (starting at zero)
514 * Dispatch ATA device presence detection, depending
515 * on whether we are using PIO or MMIO to talk to the
516 * ATA shadow registers.
522 static unsigned int ata_devchk(struct ata_port *ap,
525 if (ap->flags & ATA_FLAG_MMIO)
526 return ata_mmio_devchk(ap, device);
527 return ata_pio_devchk(ap, device);
531 * ata_dev_classify - determine device type based on ATA-spec signature
532 * @tf: ATA taskfile register set for device to be identified
534 * Determine from taskfile register contents whether a device is
535 * ATA or ATAPI, as per "Signature and persistence" section
536 * of ATA/PI spec (volume 1, sect 5.14).
542 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
543 * the event of failure.
546 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
548 /* Apple's open source Darwin code hints that some devices only
549 * put a proper signature into the LBA mid/high registers,
550 * So, we only check those. It's sufficient for uniqueness.
553 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
554 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
555 DPRINTK("found ATA device by sig\n");
559 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
560 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
561 DPRINTK("found ATAPI device by sig\n");
562 return ATA_DEV_ATAPI;
565 DPRINTK("unknown device\n");
566 return ATA_DEV_UNKNOWN;
570 * ata_dev_try_classify - Parse returned ATA device signature
571 * @ap: ATA channel to examine
572 * @device: Device to examine (starting at zero)
573 * @r_err: Value of error register on completion
575 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
576 * an ATA/ATAPI-defined set of values is placed in the ATA
577 * shadow registers, indicating the results of device detection
580 * Select the ATA device, and read the values from the ATA shadow
581 * registers. Then parse according to the Error register value,
582 * and the spec-defined values examined by ata_dev_classify().
588 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
592 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
594 struct ata_taskfile tf;
598 ap->ops->dev_select(ap, device);
600 memset(&tf, 0, sizeof(tf));
602 ap->ops->tf_read(ap, &tf);
607 /* see if device passed diags */
610 else if ((device == 0) && (err == 0x81))
615 /* determine if device is ATA or ATAPI */
616 class = ata_dev_classify(&tf);
618 if (class == ATA_DEV_UNKNOWN)
620 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
626 * ata_id_string - Convert IDENTIFY DEVICE page into string
627 * @id: IDENTIFY DEVICE results we will examine
628 * @s: string into which data is output
629 * @ofs: offset into identify device page
630 * @len: length of string to return. must be an even number.
632 * The strings in the IDENTIFY DEVICE page are broken up into
633 * 16-bit chunks. Run through the string, and output each
634 * 8-bit chunk linearly, regardless of platform.
640 void ata_id_string(const u16 *id, unsigned char *s,
641 unsigned int ofs, unsigned int len)
660 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
661 * @id: IDENTIFY DEVICE results we will examine
662 * @s: string into which data is output
663 * @ofs: offset into identify device page
664 * @len: length of string to return. must be an odd number.
666 * This function is identical to ata_id_string except that it
667 * trims trailing spaces and terminates the resulting string with
668 * null. @len must be actual maximum length (even number) + 1.
673 void ata_id_c_string(const u16 *id, unsigned char *s,
674 unsigned int ofs, unsigned int len)
680 ata_id_string(id, s, ofs, len - 1);
682 p = s + strnlen(s, len - 1);
683 while (p > s && p[-1] == ' ')
688 static u64 ata_id_n_sectors(const u16 *id)
690 if (ata_id_has_lba(id)) {
691 if (ata_id_has_lba48(id))
692 return ata_id_u64(id, 100);
694 return ata_id_u32(id, 60);
696 if (ata_id_current_chs_valid(id))
697 return ata_id_u32(id, 57);
699 return id[1] * id[3] * id[6];
704 * ata_noop_dev_select - Select device 0/1 on ATA bus
705 * @ap: ATA channel to manipulate
706 * @device: ATA device (numbered from zero) to select
708 * This function performs no actual function.
710 * May be used as the dev_select() entry in ata_port_operations.
715 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
721 * ata_std_dev_select - Select device 0/1 on ATA bus
722 * @ap: ATA channel to manipulate
723 * @device: ATA device (numbered from zero) to select
725 * Use the method defined in the ATA specification to
726 * make either device 0, or device 1, active on the
727 * ATA channel. Works with both PIO and MMIO.
729 * May be used as the dev_select() entry in ata_port_operations.
735 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
740 tmp = ATA_DEVICE_OBS;
742 tmp = ATA_DEVICE_OBS | ATA_DEV1;
744 if (ap->flags & ATA_FLAG_MMIO) {
745 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
747 outb(tmp, ap->ioaddr.device_addr);
749 ata_pause(ap); /* needed; also flushes, for mmio */
753 * ata_dev_select - Select device 0/1 on ATA bus
754 * @ap: ATA channel to manipulate
755 * @device: ATA device (numbered from zero) to select
756 * @wait: non-zero to wait for Status register BSY bit to clear
757 * @can_sleep: non-zero if context allows sleeping
759 * Use the method defined in the ATA specification to
760 * make either device 0, or device 1, active on the
763 * This is a high-level version of ata_std_dev_select(),
764 * which additionally provides the services of inserting
765 * the proper pauses and status polling, where needed.
771 void ata_dev_select(struct ata_port *ap, unsigned int device,
772 unsigned int wait, unsigned int can_sleep)
774 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
775 ap->id, device, wait);
780 ap->ops->dev_select(ap, device);
783 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
790 * ata_dump_id - IDENTIFY DEVICE info debugging output
791 * @id: IDENTIFY DEVICE page to dump
793 * Dump selected 16-bit words from the given IDENTIFY DEVICE
800 static inline void ata_dump_id(const u16 *id)
802 DPRINTK("49==0x%04x "
812 DPRINTK("80==0x%04x "
822 DPRINTK("88==0x%04x "
829 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
830 * @id: IDENTIFY data to compute xfer mask from
832 * Compute the xfermask for this device. This is not as trivial
833 * as it seems if we must consider early devices correctly.
835 * FIXME: pre IDE drive timing (do we care ?).
843 static unsigned int ata_id_xfermask(const u16 *id)
845 unsigned int pio_mask, mwdma_mask, udma_mask;
847 /* Usual case. Word 53 indicates word 64 is valid */
848 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
849 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
853 /* If word 64 isn't valid then Word 51 high byte holds
854 * the PIO timing number for the maximum. Turn it into
857 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
859 /* But wait.. there's more. Design your standards by
860 * committee and you too can get a free iordy field to
861 * process. However its the speeds not the modes that
862 * are supported... Note drivers using the timing API
863 * will get this right anyway
867 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
870 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
871 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
873 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
877 * ata_port_queue_task - Queue port_task
878 * @ap: The ata_port to queue port_task for
880 * Schedule @fn(@data) for execution after @delay jiffies using
881 * port_task. There is one port_task per port and it's the
882 * user(low level driver)'s responsibility to make sure that only
883 * one task is active at any given time.
885 * libata core layer takes care of synchronization between
886 * port_task and EH. ata_port_queue_task() may be ignored for EH
890 * Inherited from caller.
892 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
897 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
900 PREPARE_WORK(&ap->port_task, fn, data);
903 rc = queue_work(ata_wq, &ap->port_task);
905 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
907 /* rc == 0 means that another user is using port task */
912 * ata_port_flush_task - Flush port_task
913 * @ap: The ata_port to flush port_task for
915 * After this function completes, port_task is guranteed not to
916 * be running or scheduled.
919 * Kernel thread context (may sleep)
921 void ata_port_flush_task(struct ata_port *ap)
927 spin_lock_irqsave(&ap->host_set->lock, flags);
928 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
929 spin_unlock_irqrestore(&ap->host_set->lock, flags);
931 DPRINTK("flush #1\n");
932 flush_workqueue(ata_wq);
935 * At this point, if a task is running, it's guaranteed to see
936 * the FLUSH flag; thus, it will never queue pio tasks again.
939 if (!cancel_delayed_work(&ap->port_task)) {
940 DPRINTK("flush #2\n");
941 flush_workqueue(ata_wq);
944 spin_lock_irqsave(&ap->host_set->lock, flags);
945 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
946 spin_unlock_irqrestore(&ap->host_set->lock, flags);
951 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
953 struct completion *waiting = qc->private_data;
955 qc->ap->ops->tf_read(qc->ap, &qc->tf);
960 * ata_exec_internal - execute libata internal command
961 * @ap: Port to which the command is sent
962 * @dev: Device to which the command is sent
963 * @tf: Taskfile registers for the command and the result
964 * @dma_dir: Data tranfer direction of the command
965 * @buf: Data buffer of the command
966 * @buflen: Length of data buffer
968 * Executes libata internal command with timeout. @tf contains
969 * command on entry and result on return. Timeout and error
970 * conditions are reported via return value. No recovery action
971 * is taken after a command times out. It's caller's duty to
972 * clean up after timeout.
975 * None. Should be called with kernel context, might sleep.
979 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
980 struct ata_taskfile *tf,
981 int dma_dir, void *buf, unsigned int buflen)
983 u8 command = tf->command;
984 struct ata_queued_cmd *qc;
985 DECLARE_COMPLETION(wait);
987 unsigned int err_mask;
989 spin_lock_irqsave(&ap->host_set->lock, flags);
991 qc = ata_qc_new_init(ap, dev);
995 qc->dma_dir = dma_dir;
996 if (dma_dir != DMA_NONE) {
997 ata_sg_init_one(qc, buf, buflen);
998 qc->nsect = buflen / ATA_SECT_SIZE;
1001 qc->private_data = &wait;
1002 qc->complete_fn = ata_qc_complete_internal;
1006 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1008 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
1009 ata_port_flush_task(ap);
1011 spin_lock_irqsave(&ap->host_set->lock, flags);
1013 /* We're racing with irq here. If we lose, the
1014 * following test prevents us from completing the qc
1015 * again. If completion irq occurs after here but
1016 * before the caller cleans up, it will result in a
1017 * spurious interrupt. We can live with that.
1019 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1020 qc->err_mask = AC_ERR_TIMEOUT;
1021 ata_qc_complete(qc);
1022 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1026 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1030 err_mask = qc->err_mask;
1034 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1035 * Until those drivers are fixed, we detect the condition
1036 * here, fail the command with AC_ERR_SYSTEM and reenable the
1039 * Note that this doesn't change any behavior as internal
1040 * command failure results in disabling the device in the
1041 * higher layer for LLDDs without new reset/EH callbacks.
1043 * Kill the following code as soon as those drivers are fixed.
1045 if (ap->flags & ATA_FLAG_PORT_DISABLED) {
1046 err_mask |= AC_ERR_SYSTEM;
1054 * ata_pio_need_iordy - check if iordy needed
1057 * Check if the current speed of the device requires IORDY. Used
1058 * by various controllers for chip configuration.
1061 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1064 int speed = adev->pio_mode - XFER_PIO_0;
1071 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1073 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1074 pio = adev->id[ATA_ID_EIDE_PIO];
1075 /* Is the speed faster than the drive allows non IORDY ? */
1077 /* This is cycle times not frequency - watch the logic! */
1078 if (pio > 240) /* PIO2 is 240nS per cycle */
1087 * ata_dev_read_id - Read ID data from the specified device
1088 * @ap: port on which target device resides
1089 * @dev: target device
1090 * @p_class: pointer to class of the target device (may be changed)
1091 * @post_reset: is this read ID post-reset?
1092 * @p_id: read IDENTIFY page (newly allocated)
1094 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1095 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1096 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1097 * for pre-ATA4 drives.
1100 * Kernel thread context (may sleep)
1103 * 0 on success, -errno otherwise.
1105 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1106 unsigned int *p_class, int post_reset, u16 **p_id)
1108 unsigned int class = *p_class;
1109 struct ata_taskfile tf;
1110 unsigned int err_mask = 0;
1115 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1117 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1119 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1122 reason = "out of memory";
1127 ata_tf_init(ap, &tf, dev->devno);
1131 tf.command = ATA_CMD_ID_ATA;
1134 tf.command = ATA_CMD_ID_ATAPI;
1138 reason = "unsupported class";
1142 tf.protocol = ATA_PROT_PIO;
1144 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1145 id, sizeof(id[0]) * ATA_ID_WORDS);
1148 reason = "I/O error";
1152 swap_buf_le16(id, ATA_ID_WORDS);
1155 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1157 reason = "device reports illegal type";
1161 if (post_reset && class == ATA_DEV_ATA) {
1163 * The exact sequence expected by certain pre-ATA4 drives is:
1166 * INITIALIZE DEVICE PARAMETERS
1168 * Some drives were very specific about that exact sequence.
1170 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1171 err_mask = ata_dev_init_params(ap, dev, id[3], id[6]);
1174 reason = "INIT_DEV_PARAMS failed";
1178 /* current CHS translation info (id[53-58]) might be
1179 * changed. reread the identify device info.
1191 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1192 ap->id, dev->devno, reason);
1197 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1198 struct ata_device *dev)
1200 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1204 * ata_dev_configure - Configure the specified ATA/ATAPI device
1205 * @ap: Port on which target device resides
1206 * @dev: Target device to configure
1207 * @print_info: Enable device info printout
1209 * Configure @dev according to @dev->id. Generic and low-level
1210 * driver specific fixups are also applied.
1213 * Kernel thread context (may sleep)
1216 * 0 on success, -errno otherwise
1218 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1221 const u16 *id = dev->id;
1222 unsigned int xfer_mask;
1225 if (!ata_dev_enabled(dev)) {
1226 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1227 ap->id, dev->devno);
1231 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1233 /* print device capabilities */
1235 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1236 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1237 ap->id, dev->devno, id[49], id[82], id[83],
1238 id[84], id[85], id[86], id[87], id[88]);
1240 /* initialize to-be-configured parameters */
1242 dev->max_sectors = 0;
1250 * common ATA, ATAPI feature tests
1253 /* find max transfer mode; for printk only */
1254 xfer_mask = ata_id_xfermask(id);
1258 /* ATA-specific feature tests */
1259 if (dev->class == ATA_DEV_ATA) {
1260 dev->n_sectors = ata_id_n_sectors(id);
1262 if (ata_id_has_lba(id)) {
1263 const char *lba_desc;
1266 dev->flags |= ATA_DFLAG_LBA;
1267 if (ata_id_has_lba48(id)) {
1268 dev->flags |= ATA_DFLAG_LBA48;
1272 /* print device info to dmesg */
1274 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1275 "max %s, %Lu sectors: %s\n",
1277 ata_id_major_version(id),
1278 ata_mode_string(xfer_mask),
1279 (unsigned long long)dev->n_sectors,
1284 /* Default translation */
1285 dev->cylinders = id[1];
1287 dev->sectors = id[6];
1289 if (ata_id_current_chs_valid(id)) {
1290 /* Current CHS translation is valid. */
1291 dev->cylinders = id[54];
1292 dev->heads = id[55];
1293 dev->sectors = id[56];
1296 /* print device info to dmesg */
1298 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1299 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1301 ata_id_major_version(id),
1302 ata_mode_string(xfer_mask),
1303 (unsigned long long)dev->n_sectors,
1304 dev->cylinders, dev->heads, dev->sectors);
1310 /* ATAPI-specific feature tests */
1311 else if (dev->class == ATA_DEV_ATAPI) {
1312 rc = atapi_cdb_len(id);
1313 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1314 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1318 dev->cdb_len = (unsigned int) rc;
1320 /* print device info to dmesg */
1322 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1323 ap->id, dev->devno, ata_mode_string(xfer_mask));
1326 ap->host->max_cmd_len = 0;
1327 for (i = 0; i < ATA_MAX_DEVICES; i++)
1328 ap->host->max_cmd_len = max_t(unsigned int,
1329 ap->host->max_cmd_len,
1330 ap->device[i].cdb_len);
1332 /* limit bridge transfers to udma5, 200 sectors */
1333 if (ata_dev_knobble(ap, dev)) {
1335 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1336 ap->id, dev->devno);
1337 dev->udma_mask &= ATA_UDMA5;
1338 dev->max_sectors = ATA_MAX_SECTORS;
1341 if (ap->ops->dev_config)
1342 ap->ops->dev_config(ap, dev);
1344 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1348 DPRINTK("EXIT, err\n");
1353 * ata_bus_probe - Reset and probe ATA bus
1356 * Master ATA bus probing function. Initiates a hardware-dependent
1357 * bus reset, then attempts to identify any devices found on
1361 * PCI/etc. bus probe sem.
1364 * Zero on success, negative errno otherwise.
1367 static int ata_bus_probe(struct ata_port *ap)
1369 unsigned int classes[ATA_MAX_DEVICES];
1370 int i, rc, found = 0;
1371 struct ata_device *dev;
1375 /* reset and determine device classes */
1376 for (i = 0; i < ATA_MAX_DEVICES; i++)
1377 classes[i] = ATA_DEV_UNKNOWN;
1379 if (ap->ops->probe_reset) {
1380 rc = ap->ops->probe_reset(ap, classes);
1382 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1386 ap->ops->phy_reset(ap);
1388 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1389 for (i = 0; i < ATA_MAX_DEVICES; i++)
1390 classes[i] = ap->device[i].class;
1395 for (i = 0; i < ATA_MAX_DEVICES; i++)
1396 if (classes[i] == ATA_DEV_UNKNOWN)
1397 classes[i] = ATA_DEV_NONE;
1399 /* read IDENTIFY page and configure devices */
1400 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1401 dev = &ap->device[i];
1402 dev->class = classes[i];
1404 if (!ata_dev_enabled(dev))
1407 WARN_ON(dev->id != NULL);
1408 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1409 dev->class = ATA_DEV_NONE;
1413 if (ata_dev_configure(ap, dev, 1)) {
1414 ata_dev_disable(ap, dev);
1421 /* configure transfer mode */
1422 if (ap->ops->set_mode) {
1423 /* FIXME: make ->set_mode handle no device case and
1424 * return error code and failing device on failure as
1425 * ata_set_mode() does.
1428 ap->ops->set_mode(ap);
1431 while (ata_set_mode(ap, &dev))
1432 ata_dev_disable(ap, dev);
1435 for (i = 0; i < ATA_MAX_DEVICES; i++)
1436 if (ata_dev_enabled(&ap->device[i]))
1439 /* no device present, disable port */
1440 ata_port_disable(ap);
1441 ap->ops->port_disable(ap);
1446 * ata_port_probe - Mark port as enabled
1447 * @ap: Port for which we indicate enablement
1449 * Modify @ap data structure such that the system
1450 * thinks that the entire port is enabled.
1452 * LOCKING: host_set lock, or some other form of
1456 void ata_port_probe(struct ata_port *ap)
1458 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1462 * sata_print_link_status - Print SATA link status
1463 * @ap: SATA port to printk link status about
1465 * This function prints link speed and status of a SATA link.
1470 static void sata_print_link_status(struct ata_port *ap)
1474 if (!ap->ops->scr_read)
1477 sstatus = scr_read(ap, SCR_STATUS);
1479 if (sata_dev_present(ap)) {
1480 tmp = (sstatus >> 4) & 0xf;
1481 printk(KERN_INFO "ata%u: SATA link up %s (SStatus %X)\n",
1482 ap->id, sata_spd_string(tmp), sstatus);
1484 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1490 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1491 * @ap: SATA port associated with target SATA PHY.
1493 * This function issues commands to standard SATA Sxxx
1494 * PHY registers, to wake up the phy (and device), and
1495 * clear any reset condition.
1498 * PCI/etc. bus probe sem.
1501 void __sata_phy_reset(struct ata_port *ap)
1504 unsigned long timeout = jiffies + (HZ * 5);
1506 if (ap->flags & ATA_FLAG_SATA_RESET) {
1507 /* issue phy wake/reset */
1508 scr_write_flush(ap, SCR_CONTROL, 0x301);
1509 /* Couldn't find anything in SATA I/II specs, but
1510 * AHCI-1.1 10.4.2 says at least 1 ms. */
1513 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1515 /* wait for phy to become ready, if necessary */
1518 sstatus = scr_read(ap, SCR_STATUS);
1519 if ((sstatus & 0xf) != 1)
1521 } while (time_before(jiffies, timeout));
1523 /* print link status */
1524 sata_print_link_status(ap);
1526 /* TODO: phy layer with polling, timeouts, etc. */
1527 if (sata_dev_present(ap))
1530 ata_port_disable(ap);
1532 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1535 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1536 ata_port_disable(ap);
1540 ap->cbl = ATA_CBL_SATA;
1544 * sata_phy_reset - Reset SATA bus.
1545 * @ap: SATA port associated with target SATA PHY.
1547 * This function resets the SATA bus, and then probes
1548 * the bus for devices.
1551 * PCI/etc. bus probe sem.
1554 void sata_phy_reset(struct ata_port *ap)
1556 __sata_phy_reset(ap);
1557 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1563 * ata_dev_pair - return other device on cable
1567 * Obtain the other device on the same cable, or if none is
1568 * present NULL is returned
1571 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1573 struct ata_device *pair = &ap->device[1 - adev->devno];
1574 if (!ata_dev_enabled(pair))
1580 * ata_port_disable - Disable port.
1581 * @ap: Port to be disabled.
1583 * Modify @ap data structure such that the system
1584 * thinks that the entire port is disabled, and should
1585 * never attempt to probe or communicate with devices
1588 * LOCKING: host_set lock, or some other form of
1592 void ata_port_disable(struct ata_port *ap)
1594 ap->device[0].class = ATA_DEV_NONE;
1595 ap->device[1].class = ATA_DEV_NONE;
1596 ap->flags |= ATA_FLAG_PORT_DISABLED;
1600 * This mode timing computation functionality is ported over from
1601 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1604 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1605 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1606 * for PIO 5, which is a nonstandard extension and UDMA6, which
1607 * is currently supported only by Maxtor drives.
1610 static const struct ata_timing ata_timing[] = {
1612 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1613 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1614 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1615 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1617 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1618 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1619 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1621 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1623 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1624 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1625 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1627 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1628 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1629 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1631 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1632 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1633 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1635 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1636 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1637 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1639 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1644 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1645 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1647 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1649 q->setup = EZ(t->setup * 1000, T);
1650 q->act8b = EZ(t->act8b * 1000, T);
1651 q->rec8b = EZ(t->rec8b * 1000, T);
1652 q->cyc8b = EZ(t->cyc8b * 1000, T);
1653 q->active = EZ(t->active * 1000, T);
1654 q->recover = EZ(t->recover * 1000, T);
1655 q->cycle = EZ(t->cycle * 1000, T);
1656 q->udma = EZ(t->udma * 1000, UT);
1659 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1660 struct ata_timing *m, unsigned int what)
1662 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1663 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1664 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1665 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1666 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1667 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1668 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1669 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1672 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1674 const struct ata_timing *t;
1676 for (t = ata_timing; t->mode != speed; t++)
1677 if (t->mode == 0xFF)
1682 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1683 struct ata_timing *t, int T, int UT)
1685 const struct ata_timing *s;
1686 struct ata_timing p;
1692 if (!(s = ata_timing_find_mode(speed)))
1695 memcpy(t, s, sizeof(*s));
1698 * If the drive is an EIDE drive, it can tell us it needs extended
1699 * PIO/MW_DMA cycle timing.
1702 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1703 memset(&p, 0, sizeof(p));
1704 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1705 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1706 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1707 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1708 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1710 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1714 * Convert the timing to bus clock counts.
1717 ata_timing_quantize(t, t, T, UT);
1720 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1721 * S.M.A.R.T * and some other commands. We have to ensure that the
1722 * DMA cycle timing is slower/equal than the fastest PIO timing.
1725 if (speed > XFER_PIO_4) {
1726 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1727 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1731 * Lengthen active & recovery time so that cycle time is correct.
1734 if (t->act8b + t->rec8b < t->cyc8b) {
1735 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1736 t->rec8b = t->cyc8b - t->act8b;
1739 if (t->active + t->recover < t->cycle) {
1740 t->active += (t->cycle - (t->active + t->recover)) / 2;
1741 t->recover = t->cycle - t->active;
1747 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1749 unsigned int err_mask;
1752 if (dev->xfer_shift == ATA_SHIFT_PIO)
1753 dev->flags |= ATA_DFLAG_PIO;
1755 err_mask = ata_dev_set_xfermode(ap, dev);
1758 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1763 rc = ata_dev_revalidate(ap, dev, 0);
1766 "ata%u: failed to revalidate after set xfermode\n",
1771 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1772 dev->xfer_shift, (int)dev->xfer_mode);
1774 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1776 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1781 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1782 * @ap: port on which timings will be programmed
1783 * @r_failed_dev: out paramter for failed device
1785 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1786 * ata_set_mode() fails, pointer to the failing device is
1787 * returned in @r_failed_dev.
1790 * PCI/etc. bus probe sem.
1793 * 0 on success, negative errno otherwise
1795 static int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
1797 struct ata_device *dev;
1798 int i, rc = 0, used_dma = 0, found = 0;
1800 /* step 1: calculate xfer_mask */
1801 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1802 unsigned int pio_mask, dma_mask;
1804 dev = &ap->device[i];
1806 if (!ata_dev_enabled(dev))
1809 ata_dev_xfermask(ap, dev);
1811 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1812 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1813 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1814 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1823 /* step 2: always set host PIO timings */
1824 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1825 dev = &ap->device[i];
1826 if (!ata_dev_enabled(dev))
1829 if (!dev->pio_mode) {
1830 printk(KERN_WARNING "ata%u: dev %u no PIO support\n",
1831 ap->id, dev->devno);
1836 dev->xfer_mode = dev->pio_mode;
1837 dev->xfer_shift = ATA_SHIFT_PIO;
1838 if (ap->ops->set_piomode)
1839 ap->ops->set_piomode(ap, dev);
1842 /* step 3: set host DMA timings */
1843 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1844 dev = &ap->device[i];
1846 if (!ata_dev_enabled(dev) || !dev->dma_mode)
1849 dev->xfer_mode = dev->dma_mode;
1850 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1851 if (ap->ops->set_dmamode)
1852 ap->ops->set_dmamode(ap, dev);
1855 /* step 4: update devices' xfer mode */
1856 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1857 dev = &ap->device[i];
1859 if (!ata_dev_enabled(dev))
1862 rc = ata_dev_set_mode(ap, dev);
1867 /* Record simplex status. If we selected DMA then the other
1868 * host channels are not permitted to do so.
1870 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
1871 ap->host_set->simplex_claimed = 1;
1873 /* step5: chip specific finalisation */
1874 if (ap->ops->post_set_mode)
1875 ap->ops->post_set_mode(ap);
1879 *r_failed_dev = dev;
1884 * ata_tf_to_host - issue ATA taskfile to host controller
1885 * @ap: port to which command is being issued
1886 * @tf: ATA taskfile register set
1888 * Issues ATA taskfile register set to ATA host controller,
1889 * with proper synchronization with interrupt handler and
1893 * spin_lock_irqsave(host_set lock)
1896 static inline void ata_tf_to_host(struct ata_port *ap,
1897 const struct ata_taskfile *tf)
1899 ap->ops->tf_load(ap, tf);
1900 ap->ops->exec_command(ap, tf);
1904 * ata_busy_sleep - sleep until BSY clears, or timeout
1905 * @ap: port containing status register to be polled
1906 * @tmout_pat: impatience timeout
1907 * @tmout: overall timeout
1909 * Sleep until ATA Status register bit BSY clears,
1910 * or a timeout occurs.
1915 unsigned int ata_busy_sleep (struct ata_port *ap,
1916 unsigned long tmout_pat, unsigned long tmout)
1918 unsigned long timer_start, timeout;
1921 status = ata_busy_wait(ap, ATA_BUSY, 300);
1922 timer_start = jiffies;
1923 timeout = timer_start + tmout_pat;
1924 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1926 status = ata_busy_wait(ap, ATA_BUSY, 3);
1929 if (status & ATA_BUSY)
1930 printk(KERN_WARNING "ata%u is slow to respond, "
1931 "please be patient\n", ap->id);
1933 timeout = timer_start + tmout;
1934 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1936 status = ata_chk_status(ap);
1939 if (status & ATA_BUSY) {
1940 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1941 ap->id, tmout / HZ);
1948 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1950 struct ata_ioports *ioaddr = &ap->ioaddr;
1951 unsigned int dev0 = devmask & (1 << 0);
1952 unsigned int dev1 = devmask & (1 << 1);
1953 unsigned long timeout;
1955 /* if device 0 was found in ata_devchk, wait for its
1959 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1961 /* if device 1 was found in ata_devchk, wait for
1962 * register access, then wait for BSY to clear
1964 timeout = jiffies + ATA_TMOUT_BOOT;
1968 ap->ops->dev_select(ap, 1);
1969 if (ap->flags & ATA_FLAG_MMIO) {
1970 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1971 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1973 nsect = inb(ioaddr->nsect_addr);
1974 lbal = inb(ioaddr->lbal_addr);
1976 if ((nsect == 1) && (lbal == 1))
1978 if (time_after(jiffies, timeout)) {
1982 msleep(50); /* give drive a breather */
1985 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1987 /* is all this really necessary? */
1988 ap->ops->dev_select(ap, 0);
1990 ap->ops->dev_select(ap, 1);
1992 ap->ops->dev_select(ap, 0);
1995 static unsigned int ata_bus_softreset(struct ata_port *ap,
1996 unsigned int devmask)
1998 struct ata_ioports *ioaddr = &ap->ioaddr;
2000 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2002 /* software reset. causes dev0 to be selected */
2003 if (ap->flags & ATA_FLAG_MMIO) {
2004 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2005 udelay(20); /* FIXME: flush */
2006 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2007 udelay(20); /* FIXME: flush */
2008 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2010 outb(ap->ctl, ioaddr->ctl_addr);
2012 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2014 outb(ap->ctl, ioaddr->ctl_addr);
2017 /* spec mandates ">= 2ms" before checking status.
2018 * We wait 150ms, because that was the magic delay used for
2019 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2020 * between when the ATA command register is written, and then
2021 * status is checked. Because waiting for "a while" before
2022 * checking status is fine, post SRST, we perform this magic
2023 * delay here as well.
2025 * Old drivers/ide uses the 2mS rule and then waits for ready
2029 /* Before we perform post reset processing we want to see if
2030 * the bus shows 0xFF because the odd clown forgets the D7
2031 * pulldown resistor.
2033 if (ata_check_status(ap) == 0xFF)
2034 return AC_ERR_OTHER;
2036 ata_bus_post_reset(ap, devmask);
2042 * ata_bus_reset - reset host port and associated ATA channel
2043 * @ap: port to reset
2045 * This is typically the first time we actually start issuing
2046 * commands to the ATA channel. We wait for BSY to clear, then
2047 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2048 * result. Determine what devices, if any, are on the channel
2049 * by looking at the device 0/1 error register. Look at the signature
2050 * stored in each device's taskfile registers, to determine if
2051 * the device is ATA or ATAPI.
2054 * PCI/etc. bus probe sem.
2055 * Obtains host_set lock.
2058 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2061 void ata_bus_reset(struct ata_port *ap)
2063 struct ata_ioports *ioaddr = &ap->ioaddr;
2064 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2066 unsigned int dev0, dev1 = 0, devmask = 0;
2068 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2070 /* determine if device 0/1 are present */
2071 if (ap->flags & ATA_FLAG_SATA_RESET)
2074 dev0 = ata_devchk(ap, 0);
2076 dev1 = ata_devchk(ap, 1);
2080 devmask |= (1 << 0);
2082 devmask |= (1 << 1);
2084 /* select device 0 again */
2085 ap->ops->dev_select(ap, 0);
2087 /* issue bus reset */
2088 if (ap->flags & ATA_FLAG_SRST)
2089 if (ata_bus_softreset(ap, devmask))
2093 * determine by signature whether we have ATA or ATAPI devices
2095 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2096 if ((slave_possible) && (err != 0x81))
2097 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2099 /* re-enable interrupts */
2100 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2103 /* is double-select really necessary? */
2104 if (ap->device[1].class != ATA_DEV_NONE)
2105 ap->ops->dev_select(ap, 1);
2106 if (ap->device[0].class != ATA_DEV_NONE)
2107 ap->ops->dev_select(ap, 0);
2109 /* if no devices were detected, disable this port */
2110 if ((ap->device[0].class == ATA_DEV_NONE) &&
2111 (ap->device[1].class == ATA_DEV_NONE))
2114 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2115 /* set up device control for ATA_FLAG_SATA_RESET */
2116 if (ap->flags & ATA_FLAG_MMIO)
2117 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2119 outb(ap->ctl, ioaddr->ctl_addr);
2126 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2127 ap->ops->port_disable(ap);
2132 static int sata_phy_resume(struct ata_port *ap)
2134 unsigned long timeout = jiffies + (HZ * 5);
2137 scr_write_flush(ap, SCR_CONTROL, 0x300);
2139 /* Wait for phy to become ready, if necessary. */
2142 sstatus = scr_read(ap, SCR_STATUS);
2143 if ((sstatus & 0xf) != 1)
2145 } while (time_before(jiffies, timeout));
2151 * ata_std_probeinit - initialize probing
2152 * @ap: port to be probed
2154 * @ap is about to be probed. Initialize it. This function is
2155 * to be used as standard callback for ata_drive_probe_reset().
2157 * NOTE!!! Do not use this function as probeinit if a low level
2158 * driver implements only hardreset. Just pass NULL as probeinit
2159 * in that case. Using this function is probably okay but doing
2160 * so makes reset sequence different from the original
2161 * ->phy_reset implementation and Jeff nervous. :-P
2163 void ata_std_probeinit(struct ata_port *ap)
2165 if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
2166 sata_phy_resume(ap);
2167 if (sata_dev_present(ap))
2168 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2173 * ata_std_softreset - reset host port via ATA SRST
2174 * @ap: port to reset
2175 * @verbose: fail verbosely
2176 * @classes: resulting classes of attached devices
2178 * Reset host port using ATA SRST. This function is to be used
2179 * as standard callback for ata_drive_*_reset() functions.
2182 * Kernel thread context (may sleep)
2185 * 0 on success, -errno otherwise.
2187 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2189 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2190 unsigned int devmask = 0, err_mask;
2195 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2196 classes[0] = ATA_DEV_NONE;
2200 /* determine if device 0/1 are present */
2201 if (ata_devchk(ap, 0))
2202 devmask |= (1 << 0);
2203 if (slave_possible && ata_devchk(ap, 1))
2204 devmask |= (1 << 1);
2206 /* select device 0 again */
2207 ap->ops->dev_select(ap, 0);
2209 /* issue bus reset */
2210 DPRINTK("about to softreset, devmask=%x\n", devmask);
2211 err_mask = ata_bus_softreset(ap, devmask);
2214 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2217 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2222 /* determine by signature whether we have ATA or ATAPI devices */
2223 classes[0] = ata_dev_try_classify(ap, 0, &err);
2224 if (slave_possible && err != 0x81)
2225 classes[1] = ata_dev_try_classify(ap, 1, &err);
2228 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2233 * sata_std_hardreset - reset host port via SATA phy reset
2234 * @ap: port to reset
2235 * @verbose: fail verbosely
2236 * @class: resulting class of attached device
2238 * SATA phy-reset host port using DET bits of SControl register.
2239 * This function is to be used as standard callback for
2240 * ata_drive_*_reset().
2243 * Kernel thread context (may sleep)
2246 * 0 on success, -errno otherwise.
2248 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2252 /* Issue phy wake/reset */
2253 scr_write_flush(ap, SCR_CONTROL, 0x301);
2256 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2257 * 10.4.2 says at least 1 ms.
2261 /* Bring phy back */
2262 sata_phy_resume(ap);
2264 /* TODO: phy layer with polling, timeouts, etc. */
2265 if (!sata_dev_present(ap)) {
2266 *class = ATA_DEV_NONE;
2267 DPRINTK("EXIT, link offline\n");
2271 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2273 printk(KERN_ERR "ata%u: COMRESET failed "
2274 "(device not ready)\n", ap->id);
2276 DPRINTK("EXIT, device not ready\n");
2280 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2282 *class = ata_dev_try_classify(ap, 0, NULL);
2284 DPRINTK("EXIT, class=%u\n", *class);
2289 * ata_std_postreset - standard postreset callback
2290 * @ap: the target ata_port
2291 * @classes: classes of attached devices
2293 * This function is invoked after a successful reset. Note that
2294 * the device might have been reset more than once using
2295 * different reset methods before postreset is invoked.
2297 * This function is to be used as standard callback for
2298 * ata_drive_*_reset().
2301 * Kernel thread context (may sleep)
2303 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2307 /* set cable type if it isn't already set */
2308 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2309 ap->cbl = ATA_CBL_SATA;
2311 /* print link status */
2312 if (ap->cbl == ATA_CBL_SATA)
2313 sata_print_link_status(ap);
2315 /* re-enable interrupts */
2316 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2319 /* is double-select really necessary? */
2320 if (classes[0] != ATA_DEV_NONE)
2321 ap->ops->dev_select(ap, 1);
2322 if (classes[1] != ATA_DEV_NONE)
2323 ap->ops->dev_select(ap, 0);
2325 /* bail out if no device is present */
2326 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2327 DPRINTK("EXIT, no device\n");
2331 /* set up device control */
2332 if (ap->ioaddr.ctl_addr) {
2333 if (ap->flags & ATA_FLAG_MMIO)
2334 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2336 outb(ap->ctl, ap->ioaddr.ctl_addr);
2343 * ata_std_probe_reset - standard probe reset method
2344 * @ap: prot to perform probe-reset
2345 * @classes: resulting classes of attached devices
2347 * The stock off-the-shelf ->probe_reset method.
2350 * Kernel thread context (may sleep)
2353 * 0 on success, -errno otherwise.
2355 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2357 ata_reset_fn_t hardreset;
2360 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2361 hardreset = sata_std_hardreset;
2363 return ata_drive_probe_reset(ap, ata_std_probeinit,
2364 ata_std_softreset, hardreset,
2365 ata_std_postreset, classes);
2368 static int ata_do_reset(struct ata_port *ap,
2369 ata_reset_fn_t reset, ata_postreset_fn_t postreset,
2370 int verbose, unsigned int *classes)
2374 for (i = 0; i < ATA_MAX_DEVICES; i++)
2375 classes[i] = ATA_DEV_UNKNOWN;
2377 rc = reset(ap, verbose, classes);
2381 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2382 * is complete and convert all ATA_DEV_UNKNOWN to
2385 for (i = 0; i < ATA_MAX_DEVICES; i++)
2386 if (classes[i] != ATA_DEV_UNKNOWN)
2389 if (i < ATA_MAX_DEVICES)
2390 for (i = 0; i < ATA_MAX_DEVICES; i++)
2391 if (classes[i] == ATA_DEV_UNKNOWN)
2392 classes[i] = ATA_DEV_NONE;
2395 postreset(ap, classes);
2401 * ata_drive_probe_reset - Perform probe reset with given methods
2402 * @ap: port to reset
2403 * @probeinit: probeinit method (can be NULL)
2404 * @softreset: softreset method (can be NULL)
2405 * @hardreset: hardreset method (can be NULL)
2406 * @postreset: postreset method (can be NULL)
2407 * @classes: resulting classes of attached devices
2409 * Reset the specified port and classify attached devices using
2410 * given methods. This function prefers softreset but tries all
2411 * possible reset sequences to reset and classify devices. This
2412 * function is intended to be used for constructing ->probe_reset
2413 * callback by low level drivers.
2415 * Reset methods should follow the following rules.
2417 * - Return 0 on sucess, -errno on failure.
2418 * - If classification is supported, fill classes[] with
2419 * recognized class codes.
2420 * - If classification is not supported, leave classes[] alone.
2421 * - If verbose is non-zero, print error message on failure;
2422 * otherwise, shut up.
2425 * Kernel thread context (may sleep)
2428 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2429 * if classification fails, and any error code from reset
2432 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2433 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2434 ata_postreset_fn_t postreset, unsigned int *classes)
2442 rc = ata_do_reset(ap, softreset, postreset, 0, classes);
2443 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2450 rc = ata_do_reset(ap, hardreset, postreset, 0, classes);
2451 if (rc || classes[0] != ATA_DEV_UNKNOWN)
2455 rc = ata_do_reset(ap, softreset, postreset, 0, classes);
2458 if (rc == 0 && classes[0] == ATA_DEV_UNKNOWN)
2464 * ata_dev_same_device - Determine whether new ID matches configured device
2465 * @ap: port on which the device to compare against resides
2466 * @dev: device to compare against
2467 * @new_class: class of the new device
2468 * @new_id: IDENTIFY page of the new device
2470 * Compare @new_class and @new_id against @dev and determine
2471 * whether @dev is the device indicated by @new_class and
2478 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2480 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2481 unsigned int new_class, const u16 *new_id)
2483 const u16 *old_id = dev->id;
2484 unsigned char model[2][41], serial[2][21];
2487 if (dev->class != new_class) {
2489 "ata%u: dev %u class mismatch %d != %d\n",
2490 ap->id, dev->devno, dev->class, new_class);
2494 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2495 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2496 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2497 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2498 new_n_sectors = ata_id_n_sectors(new_id);
2500 if (strcmp(model[0], model[1])) {
2502 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2503 ap->id, dev->devno, model[0], model[1]);
2507 if (strcmp(serial[0], serial[1])) {
2509 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2510 ap->id, dev->devno, serial[0], serial[1]);
2514 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2516 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2517 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2518 (unsigned long long)new_n_sectors);
2526 * ata_dev_revalidate - Revalidate ATA device
2527 * @ap: port on which the device to revalidate resides
2528 * @dev: device to revalidate
2529 * @post_reset: is this revalidation after reset?
2531 * Re-read IDENTIFY page and make sure @dev is still attached to
2535 * Kernel thread context (may sleep)
2538 * 0 on success, negative errno otherwise
2540 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2547 if (!ata_dev_enabled(dev))
2553 /* allocate & read ID data */
2554 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2558 /* is the device still there? */
2559 if (!ata_dev_same_device(ap, dev, class, id)) {
2567 /* configure device according to the new ID */
2568 return ata_dev_configure(ap, dev, 0);
2571 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2572 ap->id, dev->devno, rc);
2577 static const char * const ata_dma_blacklist [] = {
2578 "WDC AC11000H", NULL,
2579 "WDC AC22100H", NULL,
2580 "WDC AC32500H", NULL,
2581 "WDC AC33100H", NULL,
2582 "WDC AC31600H", NULL,
2583 "WDC AC32100H", "24.09P07",
2584 "WDC AC23200L", "21.10N21",
2585 "Compaq CRD-8241B", NULL,
2590 "SanDisk SDP3B", NULL,
2591 "SanDisk SDP3B-64", NULL,
2592 "SANYO CD-ROM CRD", NULL,
2593 "HITACHI CDR-8", NULL,
2594 "HITACHI CDR-8335", NULL,
2595 "HITACHI CDR-8435", NULL,
2596 "Toshiba CD-ROM XM-6202B", NULL,
2597 "TOSHIBA CD-ROM XM-1702BC", NULL,
2599 "E-IDE CD-ROM CR-840", NULL,
2600 "CD-ROM Drive/F5A", NULL,
2601 "WPI CDD-820", NULL,
2602 "SAMSUNG CD-ROM SC-148C", NULL,
2603 "SAMSUNG CD-ROM SC", NULL,
2604 "SanDisk SDP3B-64", NULL,
2605 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2606 "_NEC DV5800A", NULL,
2607 "SAMSUNG CD-ROM SN-124", "N001"
2610 static int ata_strim(char *s, size_t len)
2612 len = strnlen(s, len);
2614 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2615 while ((len > 0) && (s[len - 1] == ' ')) {
2622 static int ata_dma_blacklisted(const struct ata_device *dev)
2624 unsigned char model_num[40];
2625 unsigned char model_rev[16];
2626 unsigned int nlen, rlen;
2629 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2631 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2633 nlen = ata_strim(model_num, sizeof(model_num));
2634 rlen = ata_strim(model_rev, sizeof(model_rev));
2636 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2637 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2638 if (ata_dma_blacklist[i+1] == NULL)
2640 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2648 * ata_dev_xfermask - Compute supported xfermask of the given device
2649 * @ap: Port on which the device to compute xfermask for resides
2650 * @dev: Device to compute xfermask for
2652 * Compute supported xfermask of @dev and store it in
2653 * dev->*_mask. This function is responsible for applying all
2654 * known limits including host controller limits, device
2657 * FIXME: The current implementation limits all transfer modes to
2658 * the fastest of the lowested device on the port. This is not
2659 * required on most controllers.
2664 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2666 struct ata_host_set *hs = ap->host_set;
2667 unsigned long xfer_mask;
2670 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2673 /* FIXME: Use port-wide xfermask for now */
2674 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2675 struct ata_device *d = &ap->device[i];
2676 if (!ata_dev_enabled(d))
2678 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2680 xfer_mask &= ata_id_xfermask(d->id);
2681 if (ata_dma_blacklisted(d))
2682 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2683 /* Apply cable rule here. Don't apply it early because when
2684 we handle hot plug the cable type can itself change */
2685 if (ap->cbl == ATA_CBL_PATA40)
2686 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2689 if (ata_dma_blacklisted(dev))
2690 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2691 "disabling DMA\n", ap->id, dev->devno);
2693 if (hs->flags & ATA_HOST_SIMPLEX) {
2694 if (hs->simplex_claimed)
2695 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2697 if (ap->ops->mode_filter)
2698 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2700 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2705 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2706 * @ap: Port associated with device @dev
2707 * @dev: Device to which command will be sent
2709 * Issue SET FEATURES - XFER MODE command to device @dev
2713 * PCI/etc. bus probe sem.
2716 * 0 on success, AC_ERR_* mask otherwise.
2719 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2720 struct ata_device *dev)
2722 struct ata_taskfile tf;
2723 unsigned int err_mask;
2725 /* set up set-features taskfile */
2726 DPRINTK("set features - xfer mode\n");
2728 ata_tf_init(ap, &tf, dev->devno);
2729 tf.command = ATA_CMD_SET_FEATURES;
2730 tf.feature = SETFEATURES_XFER;
2731 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2732 tf.protocol = ATA_PROT_NODATA;
2733 tf.nsect = dev->xfer_mode;
2735 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2737 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2742 * ata_dev_init_params - Issue INIT DEV PARAMS command
2743 * @ap: Port associated with device @dev
2744 * @dev: Device to which command will be sent
2747 * Kernel thread context (may sleep)
2750 * 0 on success, AC_ERR_* mask otherwise.
2753 static unsigned int ata_dev_init_params(struct ata_port *ap,
2754 struct ata_device *dev,
2758 struct ata_taskfile tf;
2759 unsigned int err_mask;
2761 /* Number of sectors per track 1-255. Number of heads 1-16 */
2762 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2763 return AC_ERR_INVALID;
2765 /* set up init dev params taskfile */
2766 DPRINTK("init dev params \n");
2768 ata_tf_init(ap, &tf, dev->devno);
2769 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2770 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2771 tf.protocol = ATA_PROT_NODATA;
2773 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2775 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2777 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2782 * ata_sg_clean - Unmap DMA memory associated with command
2783 * @qc: Command containing DMA memory to be released
2785 * Unmap all mapped DMA memory associated with this command.
2788 * spin_lock_irqsave(host_set lock)
2791 static void ata_sg_clean(struct ata_queued_cmd *qc)
2793 struct ata_port *ap = qc->ap;
2794 struct scatterlist *sg = qc->__sg;
2795 int dir = qc->dma_dir;
2796 void *pad_buf = NULL;
2798 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2799 WARN_ON(sg == NULL);
2801 if (qc->flags & ATA_QCFLAG_SINGLE)
2802 WARN_ON(qc->n_elem > 1);
2804 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2806 /* if we padded the buffer out to 32-bit bound, and data
2807 * xfer direction is from-device, we must copy from the
2808 * pad buffer back into the supplied buffer
2810 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2811 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2813 if (qc->flags & ATA_QCFLAG_SG) {
2815 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
2816 /* restore last sg */
2817 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2819 struct scatterlist *psg = &qc->pad_sgent;
2820 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2821 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2822 kunmap_atomic(addr, KM_IRQ0);
2826 dma_unmap_single(ap->dev,
2827 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2830 sg->length += qc->pad_len;
2832 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2833 pad_buf, qc->pad_len);
2836 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2841 * ata_fill_sg - Fill PCI IDE PRD table
2842 * @qc: Metadata associated with taskfile to be transferred
2844 * Fill PCI IDE PRD (scatter-gather) table with segments
2845 * associated with the current disk command.
2848 * spin_lock_irqsave(host_set lock)
2851 static void ata_fill_sg(struct ata_queued_cmd *qc)
2853 struct ata_port *ap = qc->ap;
2854 struct scatterlist *sg;
2857 WARN_ON(qc->__sg == NULL);
2858 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2861 ata_for_each_sg(sg, qc) {
2865 /* determine if physical DMA addr spans 64K boundary.
2866 * Note h/w doesn't support 64-bit, so we unconditionally
2867 * truncate dma_addr_t to u32.
2869 addr = (u32) sg_dma_address(sg);
2870 sg_len = sg_dma_len(sg);
2873 offset = addr & 0xffff;
2875 if ((offset + sg_len) > 0x10000)
2876 len = 0x10000 - offset;
2878 ap->prd[idx].addr = cpu_to_le32(addr);
2879 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2880 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2889 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2892 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2893 * @qc: Metadata associated with taskfile to check
2895 * Allow low-level driver to filter ATA PACKET commands, returning
2896 * a status indicating whether or not it is OK to use DMA for the
2897 * supplied PACKET command.
2900 * spin_lock_irqsave(host_set lock)
2902 * RETURNS: 0 when ATAPI DMA can be used
2905 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2907 struct ata_port *ap = qc->ap;
2908 int rc = 0; /* Assume ATAPI DMA is OK by default */
2910 if (ap->ops->check_atapi_dma)
2911 rc = ap->ops->check_atapi_dma(qc);
2916 * ata_qc_prep - Prepare taskfile for submission
2917 * @qc: Metadata associated with taskfile to be prepared
2919 * Prepare ATA taskfile for submission.
2922 * spin_lock_irqsave(host_set lock)
2924 void ata_qc_prep(struct ata_queued_cmd *qc)
2926 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2932 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2935 * ata_sg_init_one - Associate command with memory buffer
2936 * @qc: Command to be associated
2937 * @buf: Memory buffer
2938 * @buflen: Length of memory buffer, in bytes.
2940 * Initialize the data-related elements of queued_cmd @qc
2941 * to point to a single memory buffer, @buf of byte length @buflen.
2944 * spin_lock_irqsave(host_set lock)
2947 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2949 struct scatterlist *sg;
2951 qc->flags |= ATA_QCFLAG_SINGLE;
2953 memset(&qc->sgent, 0, sizeof(qc->sgent));
2954 qc->__sg = &qc->sgent;
2956 qc->orig_n_elem = 1;
2960 sg_init_one(sg, buf, buflen);
2964 * ata_sg_init - Associate command with scatter-gather table.
2965 * @qc: Command to be associated
2966 * @sg: Scatter-gather table.
2967 * @n_elem: Number of elements in s/g table.
2969 * Initialize the data-related elements of queued_cmd @qc
2970 * to point to a scatter-gather table @sg, containing @n_elem
2974 * spin_lock_irqsave(host_set lock)
2977 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2978 unsigned int n_elem)
2980 qc->flags |= ATA_QCFLAG_SG;
2982 qc->n_elem = n_elem;
2983 qc->orig_n_elem = n_elem;
2987 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2988 * @qc: Command with memory buffer to be mapped.
2990 * DMA-map the memory buffer associated with queued_cmd @qc.
2993 * spin_lock_irqsave(host_set lock)
2996 * Zero on success, negative on error.
2999 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3001 struct ata_port *ap = qc->ap;
3002 int dir = qc->dma_dir;
3003 struct scatterlist *sg = qc->__sg;
3004 dma_addr_t dma_address;
3007 /* we must lengthen transfers to end on a 32-bit boundary */
3008 qc->pad_len = sg->length & 3;
3010 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3011 struct scatterlist *psg = &qc->pad_sgent;
3013 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3015 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3017 if (qc->tf.flags & ATA_TFLAG_WRITE)
3018 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3021 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3022 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3024 sg->length -= qc->pad_len;
3025 if (sg->length == 0)
3028 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3029 sg->length, qc->pad_len);
3037 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3039 if (dma_mapping_error(dma_address)) {
3041 sg->length += qc->pad_len;
3045 sg_dma_address(sg) = dma_address;
3046 sg_dma_len(sg) = sg->length;
3049 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3050 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3056 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3057 * @qc: Command with scatter-gather table to be mapped.
3059 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3062 * spin_lock_irqsave(host_set lock)
3065 * Zero on success, negative on error.
3069 static int ata_sg_setup(struct ata_queued_cmd *qc)
3071 struct ata_port *ap = qc->ap;
3072 struct scatterlist *sg = qc->__sg;
3073 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3074 int n_elem, pre_n_elem, dir, trim_sg = 0;
3076 VPRINTK("ENTER, ata%u\n", ap->id);
3077 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3079 /* we must lengthen transfers to end on a 32-bit boundary */
3080 qc->pad_len = lsg->length & 3;
3082 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3083 struct scatterlist *psg = &qc->pad_sgent;
3084 unsigned int offset;
3086 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3088 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3091 * psg->page/offset are used to copy to-be-written
3092 * data in this function or read data in ata_sg_clean.
3094 offset = lsg->offset + lsg->length - qc->pad_len;
3095 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3096 psg->offset = offset_in_page(offset);
3098 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3099 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3100 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3101 kunmap_atomic(addr, KM_IRQ0);
3104 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3105 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3107 lsg->length -= qc->pad_len;
3108 if (lsg->length == 0)
3111 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3112 qc->n_elem - 1, lsg->length, qc->pad_len);
3115 pre_n_elem = qc->n_elem;
3116 if (trim_sg && pre_n_elem)
3125 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3127 /* restore last sg */
3128 lsg->length += qc->pad_len;
3132 DPRINTK("%d sg elements mapped\n", n_elem);
3135 qc->n_elem = n_elem;
3141 * ata_poll_qc_complete - turn irq back on and finish qc
3142 * @qc: Command to complete
3143 * @err_mask: ATA status register content
3146 * None. (grabs host lock)
3149 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3151 struct ata_port *ap = qc->ap;
3152 unsigned long flags;
3154 spin_lock_irqsave(&ap->host_set->lock, flags);
3155 ap->flags &= ~ATA_FLAG_NOINTR;
3157 ata_qc_complete(qc);
3158 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3162 * ata_pio_poll - poll using PIO, depending on current state
3163 * @ap: the target ata_port
3166 * None. (executing in kernel thread context)
3169 * timeout value to use
3172 static unsigned long ata_pio_poll(struct ata_port *ap)
3174 struct ata_queued_cmd *qc;
3176 unsigned int poll_state = HSM_ST_UNKNOWN;
3177 unsigned int reg_state = HSM_ST_UNKNOWN;
3179 qc = ata_qc_from_tag(ap, ap->active_tag);
3180 WARN_ON(qc == NULL);
3182 switch (ap->hsm_task_state) {
3185 poll_state = HSM_ST_POLL;
3189 case HSM_ST_LAST_POLL:
3190 poll_state = HSM_ST_LAST_POLL;
3191 reg_state = HSM_ST_LAST;
3198 status = ata_chk_status(ap);
3199 if (status & ATA_BUSY) {
3200 if (time_after(jiffies, ap->pio_task_timeout)) {
3201 qc->err_mask |= AC_ERR_TIMEOUT;
3202 ap->hsm_task_state = HSM_ST_TMOUT;
3205 ap->hsm_task_state = poll_state;
3206 return ATA_SHORT_PAUSE;
3209 ap->hsm_task_state = reg_state;
3214 * ata_pio_complete - check if drive is busy or idle
3215 * @ap: the target ata_port
3218 * None. (executing in kernel thread context)
3221 * Non-zero if qc completed, zero otherwise.
3224 static int ata_pio_complete (struct ata_port *ap)
3226 struct ata_queued_cmd *qc;
3230 * This is purely heuristic. This is a fast path. Sometimes when
3231 * we enter, BSY will be cleared in a chk-status or two. If not,
3232 * the drive is probably seeking or something. Snooze for a couple
3233 * msecs, then chk-status again. If still busy, fall back to
3234 * HSM_ST_POLL state.
3236 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3237 if (drv_stat & ATA_BUSY) {
3239 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3240 if (drv_stat & ATA_BUSY) {
3241 ap->hsm_task_state = HSM_ST_LAST_POLL;
3242 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3247 qc = ata_qc_from_tag(ap, ap->active_tag);
3248 WARN_ON(qc == NULL);
3250 drv_stat = ata_wait_idle(ap);
3251 if (!ata_ok(drv_stat)) {
3252 qc->err_mask |= __ac_err_mask(drv_stat);
3253 ap->hsm_task_state = HSM_ST_ERR;
3257 ap->hsm_task_state = HSM_ST_IDLE;
3259 WARN_ON(qc->err_mask);
3260 ata_poll_qc_complete(qc);
3262 /* another command may start at this point */
3269 * swap_buf_le16 - swap halves of 16-bit words in place
3270 * @buf: Buffer to swap
3271 * @buf_words: Number of 16-bit words in buffer.
3273 * Swap halves of 16-bit words if needed to convert from
3274 * little-endian byte order to native cpu byte order, or
3278 * Inherited from caller.
3280 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3285 for (i = 0; i < buf_words; i++)
3286 buf[i] = le16_to_cpu(buf[i]);
3287 #endif /* __BIG_ENDIAN */
3291 * ata_mmio_data_xfer - Transfer data by MMIO
3292 * @ap: port to read/write
3294 * @buflen: buffer length
3295 * @write_data: read/write
3297 * Transfer data from/to the device data register by MMIO.
3300 * Inherited from caller.
3303 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3304 unsigned int buflen, int write_data)
3307 unsigned int words = buflen >> 1;
3308 u16 *buf16 = (u16 *) buf;
3309 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3311 /* Transfer multiple of 2 bytes */
3313 for (i = 0; i < words; i++)
3314 writew(le16_to_cpu(buf16[i]), mmio);
3316 for (i = 0; i < words; i++)
3317 buf16[i] = cpu_to_le16(readw(mmio));
3320 /* Transfer trailing 1 byte, if any. */
3321 if (unlikely(buflen & 0x01)) {
3322 u16 align_buf[1] = { 0 };
3323 unsigned char *trailing_buf = buf + buflen - 1;
3326 memcpy(align_buf, trailing_buf, 1);
3327 writew(le16_to_cpu(align_buf[0]), mmio);
3329 align_buf[0] = cpu_to_le16(readw(mmio));
3330 memcpy(trailing_buf, align_buf, 1);
3336 * ata_pio_data_xfer - Transfer data by PIO
3337 * @ap: port to read/write
3339 * @buflen: buffer length
3340 * @write_data: read/write
3342 * Transfer data from/to the device data register by PIO.
3345 * Inherited from caller.
3348 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3349 unsigned int buflen, int write_data)
3351 unsigned int words = buflen >> 1;
3353 /* Transfer multiple of 2 bytes */
3355 outsw(ap->ioaddr.data_addr, buf, words);
3357 insw(ap->ioaddr.data_addr, buf, words);
3359 /* Transfer trailing 1 byte, if any. */
3360 if (unlikely(buflen & 0x01)) {
3361 u16 align_buf[1] = { 0 };
3362 unsigned char *trailing_buf = buf + buflen - 1;
3365 memcpy(align_buf, trailing_buf, 1);
3366 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3368 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3369 memcpy(trailing_buf, align_buf, 1);
3375 * ata_data_xfer - Transfer data from/to the data register.
3376 * @ap: port to read/write
3378 * @buflen: buffer length
3379 * @do_write: read/write
3381 * Transfer data from/to the device data register.
3384 * Inherited from caller.
3387 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3388 unsigned int buflen, int do_write)
3390 /* Make the crap hardware pay the costs not the good stuff */
3391 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3392 unsigned long flags;
3393 local_irq_save(flags);
3394 if (ap->flags & ATA_FLAG_MMIO)
3395 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3397 ata_pio_data_xfer(ap, buf, buflen, do_write);
3398 local_irq_restore(flags);
3400 if (ap->flags & ATA_FLAG_MMIO)
3401 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3403 ata_pio_data_xfer(ap, buf, buflen, do_write);
3408 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3409 * @qc: Command on going
3411 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3414 * Inherited from caller.
3417 static void ata_pio_sector(struct ata_queued_cmd *qc)
3419 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3420 struct scatterlist *sg = qc->__sg;
3421 struct ata_port *ap = qc->ap;
3423 unsigned int offset;
3426 if (qc->cursect == (qc->nsect - 1))
3427 ap->hsm_task_state = HSM_ST_LAST;
3429 page = sg[qc->cursg].page;
3430 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3432 /* get the current page and offset */
3433 page = nth_page(page, (offset >> PAGE_SHIFT));
3434 offset %= PAGE_SIZE;
3436 buf = kmap(page) + offset;
3441 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3446 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3448 /* do the actual data transfer */
3449 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3450 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3456 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3457 * @qc: Command on going
3458 * @bytes: number of bytes
3460 * Transfer Transfer data from/to the ATAPI device.
3463 * Inherited from caller.
3467 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3469 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3470 struct scatterlist *sg = qc->__sg;
3471 struct ata_port *ap = qc->ap;
3474 unsigned int offset, count;
3476 if (qc->curbytes + bytes >= qc->nbytes)
3477 ap->hsm_task_state = HSM_ST_LAST;
3480 if (unlikely(qc->cursg >= qc->n_elem)) {
3482 * The end of qc->sg is reached and the device expects
3483 * more data to transfer. In order not to overrun qc->sg
3484 * and fulfill length specified in the byte count register,
3485 * - for read case, discard trailing data from the device
3486 * - for write case, padding zero data to the device
3488 u16 pad_buf[1] = { 0 };
3489 unsigned int words = bytes >> 1;
3492 if (words) /* warning if bytes > 1 */
3493 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3496 for (i = 0; i < words; i++)
3497 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3499 ap->hsm_task_state = HSM_ST_LAST;
3503 sg = &qc->__sg[qc->cursg];
3506 offset = sg->offset + qc->cursg_ofs;
3508 /* get the current page and offset */
3509 page = nth_page(page, (offset >> PAGE_SHIFT));
3510 offset %= PAGE_SIZE;
3512 /* don't overrun current sg */
3513 count = min(sg->length - qc->cursg_ofs, bytes);
3515 /* don't cross page boundaries */
3516 count = min(count, (unsigned int)PAGE_SIZE - offset);
3518 buf = kmap(page) + offset;
3521 qc->curbytes += count;
3522 qc->cursg_ofs += count;
3524 if (qc->cursg_ofs == sg->length) {
3529 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3531 /* do the actual data transfer */
3532 ata_data_xfer(ap, buf, count, do_write);
3541 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3542 * @qc: Command on going
3544 * Transfer Transfer data from/to the ATAPI device.
3547 * Inherited from caller.
3550 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3552 struct ata_port *ap = qc->ap;
3553 struct ata_device *dev = qc->dev;
3554 unsigned int ireason, bc_lo, bc_hi, bytes;
3555 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3557 ap->ops->tf_read(ap, &qc->tf);
3558 ireason = qc->tf.nsect;
3559 bc_lo = qc->tf.lbam;
3560 bc_hi = qc->tf.lbah;
3561 bytes = (bc_hi << 8) | bc_lo;
3563 /* shall be cleared to zero, indicating xfer of data */
3564 if (ireason & (1 << 0))
3567 /* make sure transfer direction matches expected */
3568 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3569 if (do_write != i_write)
3572 __atapi_pio_bytes(qc, bytes);
3577 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3578 ap->id, dev->devno);
3579 qc->err_mask |= AC_ERR_HSM;
3580 ap->hsm_task_state = HSM_ST_ERR;
3584 * ata_pio_block - start PIO on a block
3585 * @ap: the target ata_port
3588 * None. (executing in kernel thread context)
3591 static void ata_pio_block(struct ata_port *ap)
3593 struct ata_queued_cmd *qc;
3597 * This is purely heuristic. This is a fast path.
3598 * Sometimes when we enter, BSY will be cleared in
3599 * a chk-status or two. If not, the drive is probably seeking
3600 * or something. Snooze for a couple msecs, then
3601 * chk-status again. If still busy, fall back to
3602 * HSM_ST_POLL state.
3604 status = ata_busy_wait(ap, ATA_BUSY, 5);
3605 if (status & ATA_BUSY) {
3607 status = ata_busy_wait(ap, ATA_BUSY, 10);
3608 if (status & ATA_BUSY) {
3609 ap->hsm_task_state = HSM_ST_POLL;
3610 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3615 qc = ata_qc_from_tag(ap, ap->active_tag);
3616 WARN_ON(qc == NULL);
3619 if (status & (ATA_ERR | ATA_DF)) {
3620 qc->err_mask |= AC_ERR_DEV;
3621 ap->hsm_task_state = HSM_ST_ERR;
3625 /* transfer data if any */
3626 if (is_atapi_taskfile(&qc->tf)) {
3627 /* DRQ=0 means no more data to transfer */
3628 if ((status & ATA_DRQ) == 0) {
3629 ap->hsm_task_state = HSM_ST_LAST;
3633 atapi_pio_bytes(qc);
3635 /* handle BSY=0, DRQ=0 as error */
3636 if ((status & ATA_DRQ) == 0) {
3637 qc->err_mask |= AC_ERR_HSM;
3638 ap->hsm_task_state = HSM_ST_ERR;
3646 static void ata_pio_error(struct ata_port *ap)
3648 struct ata_queued_cmd *qc;
3650 qc = ata_qc_from_tag(ap, ap->active_tag);
3651 WARN_ON(qc == NULL);
3653 if (qc->tf.command != ATA_CMD_PACKET)
3654 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3656 /* make sure qc->err_mask is available to
3657 * know what's wrong and recover
3659 WARN_ON(qc->err_mask == 0);
3661 ap->hsm_task_state = HSM_ST_IDLE;
3663 ata_poll_qc_complete(qc);
3666 static void ata_pio_task(void *_data)
3668 struct ata_port *ap = _data;
3669 unsigned long timeout;
3676 switch (ap->hsm_task_state) {
3685 qc_completed = ata_pio_complete(ap);
3689 case HSM_ST_LAST_POLL:
3690 timeout = ata_pio_poll(ap);
3700 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3701 else if (!qc_completed)
3706 * atapi_packet_task - Write CDB bytes to hardware
3707 * @_data: Port to which ATAPI device is attached.
3709 * When device has indicated its readiness to accept
3710 * a CDB, this function is called. Send the CDB.
3711 * If DMA is to be performed, exit immediately.
3712 * Otherwise, we are in polling mode, so poll
3713 * status under operation succeeds or fails.
3716 * Kernel thread context (may sleep)
3719 static void atapi_packet_task(void *_data)
3721 struct ata_port *ap = _data;
3722 struct ata_queued_cmd *qc;
3725 qc = ata_qc_from_tag(ap, ap->active_tag);
3726 WARN_ON(qc == NULL);
3727 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3729 /* sleep-wait for BSY to clear */
3730 DPRINTK("busy wait\n");
3731 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3732 qc->err_mask |= AC_ERR_TIMEOUT;
3736 /* make sure DRQ is set */
3737 status = ata_chk_status(ap);
3738 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3739 qc->err_mask |= AC_ERR_HSM;
3744 DPRINTK("send cdb\n");
3745 WARN_ON(qc->dev->cdb_len < 12);
3747 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3748 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3749 unsigned long flags;
3751 /* Once we're done issuing command and kicking bmdma,
3752 * irq handler takes over. To not lose irq, we need
3753 * to clear NOINTR flag before sending cdb, but
3754 * interrupt handler shouldn't be invoked before we're
3755 * finished. Hence, the following locking.
3757 spin_lock_irqsave(&ap->host_set->lock, flags);
3758 ap->flags &= ~ATA_FLAG_NOINTR;
3759 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3760 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3761 ap->ops->bmdma_start(qc); /* initiate bmdma */
3762 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3764 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3766 /* PIO commands are handled by polling */
3767 ap->hsm_task_state = HSM_ST;
3768 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3774 ata_poll_qc_complete(qc);
3778 * ata_qc_timeout - Handle timeout of queued command
3779 * @qc: Command that timed out
3781 * Some part of the kernel (currently, only the SCSI layer)
3782 * has noticed that the active command on port @ap has not
3783 * completed after a specified length of time. Handle this
3784 * condition by disabling DMA (if necessary) and completing
3785 * transactions, with error if necessary.
3787 * This also handles the case of the "lost interrupt", where
3788 * for some reason (possibly hardware bug, possibly driver bug)
3789 * an interrupt was not delivered to the driver, even though the
3790 * transaction completed successfully.
3793 * Inherited from SCSI layer (none, can sleep)
3796 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3798 struct ata_port *ap = qc->ap;
3799 struct ata_host_set *host_set = ap->host_set;
3800 u8 host_stat = 0, drv_stat;
3801 unsigned long flags;
3805 ap->hsm_task_state = HSM_ST_IDLE;
3807 spin_lock_irqsave(&host_set->lock, flags);
3809 switch (qc->tf.protocol) {
3812 case ATA_PROT_ATAPI_DMA:
3813 host_stat = ap->ops->bmdma_status(ap);
3815 /* before we do anything else, clear DMA-Start bit */
3816 ap->ops->bmdma_stop(qc);
3822 drv_stat = ata_chk_status(ap);
3824 /* ack bmdma irq events */
3825 ap->ops->irq_clear(ap);
3827 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3828 ap->id, qc->tf.command, drv_stat, host_stat);
3830 /* complete taskfile transaction */
3831 qc->err_mask |= ac_err_mask(drv_stat);
3835 spin_unlock_irqrestore(&host_set->lock, flags);
3837 ata_eh_qc_complete(qc);
3843 * ata_eng_timeout - Handle timeout of queued command
3844 * @ap: Port on which timed-out command is active
3846 * Some part of the kernel (currently, only the SCSI layer)
3847 * has noticed that the active command on port @ap has not
3848 * completed after a specified length of time. Handle this
3849 * condition by disabling DMA (if necessary) and completing
3850 * transactions, with error if necessary.
3852 * This also handles the case of the "lost interrupt", where
3853 * for some reason (possibly hardware bug, possibly driver bug)
3854 * an interrupt was not delivered to the driver, even though the
3855 * transaction completed successfully.
3858 * Inherited from SCSI layer (none, can sleep)
3861 void ata_eng_timeout(struct ata_port *ap)
3865 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3871 * ata_qc_new - Request an available ATA command, for queueing
3872 * @ap: Port associated with device @dev
3873 * @dev: Device from whom we request an available command structure
3879 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3881 struct ata_queued_cmd *qc = NULL;
3884 for (i = 0; i < ATA_MAX_QUEUE; i++)
3885 if (!test_and_set_bit(i, &ap->qactive)) {
3886 qc = ata_qc_from_tag(ap, i);
3897 * ata_qc_new_init - Request an available ATA command, and initialize it
3898 * @ap: Port associated with device @dev
3899 * @dev: Device from whom we request an available command structure
3905 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3906 struct ata_device *dev)
3908 struct ata_queued_cmd *qc;
3910 qc = ata_qc_new(ap);
3923 * ata_qc_free - free unused ata_queued_cmd
3924 * @qc: Command to complete
3926 * Designed to free unused ata_queued_cmd object
3927 * in case something prevents using it.
3930 * spin_lock_irqsave(host_set lock)
3932 void ata_qc_free(struct ata_queued_cmd *qc)
3934 struct ata_port *ap = qc->ap;
3937 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3941 if (likely(ata_tag_valid(tag))) {
3942 if (tag == ap->active_tag)
3943 ap->active_tag = ATA_TAG_POISON;
3944 qc->tag = ATA_TAG_POISON;
3945 clear_bit(tag, &ap->qactive);
3949 void __ata_qc_complete(struct ata_queued_cmd *qc)
3951 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3952 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3954 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3957 /* atapi: mark qc as inactive to prevent the interrupt handler
3958 * from completing the command twice later, before the error handler
3959 * is called. (when rc != 0 and atapi request sense is needed)
3961 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3963 /* call completion callback */
3964 qc->complete_fn(qc);
3967 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3969 struct ata_port *ap = qc->ap;
3971 switch (qc->tf.protocol) {
3973 case ATA_PROT_ATAPI_DMA:
3976 case ATA_PROT_ATAPI:
3978 if (ap->flags & ATA_FLAG_PIO_DMA)
3991 * ata_qc_issue - issue taskfile to device
3992 * @qc: command to issue to device
3994 * Prepare an ATA command to submission to device.
3995 * This includes mapping the data into a DMA-able
3996 * area, filling in the S/G table, and finally
3997 * writing the taskfile to hardware, starting the command.
4000 * spin_lock_irqsave(host_set lock)
4002 void ata_qc_issue(struct ata_queued_cmd *qc)
4004 struct ata_port *ap = qc->ap;
4006 qc->ap->active_tag = qc->tag;
4007 qc->flags |= ATA_QCFLAG_ACTIVE;
4009 if (ata_should_dma_map(qc)) {
4010 if (qc->flags & ATA_QCFLAG_SG) {
4011 if (ata_sg_setup(qc))
4013 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4014 if (ata_sg_setup_one(qc))
4018 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4021 ap->ops->qc_prep(qc);
4023 qc->err_mask |= ap->ops->qc_issue(qc);
4024 if (unlikely(qc->err_mask))
4029 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4030 qc->err_mask |= AC_ERR_SYSTEM;
4032 ata_qc_complete(qc);
4036 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4037 * @qc: command to issue to device
4039 * Using various libata functions and hooks, this function
4040 * starts an ATA command. ATA commands are grouped into
4041 * classes called "protocols", and issuing each type of protocol
4042 * is slightly different.
4044 * May be used as the qc_issue() entry in ata_port_operations.
4047 * spin_lock_irqsave(host_set lock)
4050 * Zero on success, AC_ERR_* mask on failure
4053 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4055 struct ata_port *ap = qc->ap;
4057 ata_dev_select(ap, qc->dev->devno, 1, 0);
4059 switch (qc->tf.protocol) {
4060 case ATA_PROT_NODATA:
4061 ata_tf_to_host(ap, &qc->tf);
4065 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4066 ap->ops->bmdma_setup(qc); /* set up bmdma */
4067 ap->ops->bmdma_start(qc); /* initiate bmdma */
4070 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4071 ata_qc_set_polling(qc);
4072 ata_tf_to_host(ap, &qc->tf);
4073 ap->hsm_task_state = HSM_ST;
4074 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4077 case ATA_PROT_ATAPI:
4078 ata_qc_set_polling(qc);
4079 ata_tf_to_host(ap, &qc->tf);
4080 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4083 case ATA_PROT_ATAPI_NODATA:
4084 ap->flags |= ATA_FLAG_NOINTR;
4085 ata_tf_to_host(ap, &qc->tf);
4086 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4089 case ATA_PROT_ATAPI_DMA:
4090 ap->flags |= ATA_FLAG_NOINTR;
4091 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4092 ap->ops->bmdma_setup(qc); /* set up bmdma */
4093 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4098 return AC_ERR_SYSTEM;
4105 * ata_host_intr - Handle host interrupt for given (port, task)
4106 * @ap: Port on which interrupt arrived (possibly...)
4107 * @qc: Taskfile currently active in engine
4109 * Handle host interrupt for given queued command. Currently,
4110 * only DMA interrupts are handled. All other commands are
4111 * handled via polling with interrupts disabled (nIEN bit).
4114 * spin_lock_irqsave(host_set lock)
4117 * One if interrupt was handled, zero if not (shared irq).
4120 inline unsigned int ata_host_intr (struct ata_port *ap,
4121 struct ata_queued_cmd *qc)
4123 u8 status, host_stat;
4125 switch (qc->tf.protocol) {
4128 case ATA_PROT_ATAPI_DMA:
4129 case ATA_PROT_ATAPI:
4130 /* check status of DMA engine */
4131 host_stat = ap->ops->bmdma_status(ap);
4132 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4134 /* if it's not our irq... */
4135 if (!(host_stat & ATA_DMA_INTR))
4138 /* before we do anything else, clear DMA-Start bit */
4139 ap->ops->bmdma_stop(qc);
4143 case ATA_PROT_ATAPI_NODATA:
4144 case ATA_PROT_NODATA:
4145 /* check altstatus */
4146 status = ata_altstatus(ap);
4147 if (status & ATA_BUSY)
4150 /* check main status, clearing INTRQ */
4151 status = ata_chk_status(ap);
4152 if (unlikely(status & ATA_BUSY))
4154 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4155 ap->id, qc->tf.protocol, status);
4157 /* ack bmdma irq events */
4158 ap->ops->irq_clear(ap);
4160 /* complete taskfile transaction */
4161 qc->err_mask |= ac_err_mask(status);
4162 ata_qc_complete(qc);
4169 return 1; /* irq handled */
4172 ap->stats.idle_irq++;
4175 if ((ap->stats.idle_irq % 1000) == 0) {
4176 ata_irq_ack(ap, 0); /* debug trap */
4177 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4181 return 0; /* irq not handled */
4185 * ata_interrupt - Default ATA host interrupt handler
4186 * @irq: irq line (unused)
4187 * @dev_instance: pointer to our ata_host_set information structure
4190 * Default interrupt handler for PCI IDE devices. Calls
4191 * ata_host_intr() for each port that is not disabled.
4194 * Obtains host_set lock during operation.
4197 * IRQ_NONE or IRQ_HANDLED.
4200 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4202 struct ata_host_set *host_set = dev_instance;
4204 unsigned int handled = 0;
4205 unsigned long flags;
4207 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4208 spin_lock_irqsave(&host_set->lock, flags);
4210 for (i = 0; i < host_set->n_ports; i++) {
4211 struct ata_port *ap;
4213 ap = host_set->ports[i];
4215 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4216 struct ata_queued_cmd *qc;
4218 qc = ata_qc_from_tag(ap, ap->active_tag);
4219 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4220 (qc->flags & ATA_QCFLAG_ACTIVE))
4221 handled |= ata_host_intr(ap, qc);
4225 spin_unlock_irqrestore(&host_set->lock, flags);
4227 return IRQ_RETVAL(handled);
4232 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4233 * without filling any other registers
4235 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4238 struct ata_taskfile tf;
4241 ata_tf_init(ap, &tf, dev->devno);
4244 tf.flags |= ATA_TFLAG_DEVICE;
4245 tf.protocol = ATA_PROT_NODATA;
4247 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4249 printk(KERN_ERR "%s: ata command failed: %d\n",
4255 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4259 if (!ata_try_flush_cache(dev))
4262 if (ata_id_has_flush_ext(dev->id))
4263 cmd = ATA_CMD_FLUSH_EXT;
4265 cmd = ATA_CMD_FLUSH;
4267 return ata_do_simple_cmd(ap, dev, cmd);
4270 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4272 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4275 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4277 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4281 * ata_device_resume - wakeup a previously suspended devices
4282 * @ap: port the device is connected to
4283 * @dev: the device to resume
4285 * Kick the drive back into action, by sending it an idle immediate
4286 * command and making sure its transfer mode matches between drive
4290 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4292 if (ap->flags & ATA_FLAG_SUSPENDED) {
4293 struct ata_device *failed_dev;
4294 ap->flags &= ~ATA_FLAG_SUSPENDED;
4295 while (ata_set_mode(ap, &failed_dev))
4296 ata_dev_disable(ap, failed_dev);
4298 if (!ata_dev_enabled(dev))
4300 if (dev->class == ATA_DEV_ATA)
4301 ata_start_drive(ap, dev);
4307 * ata_device_suspend - prepare a device for suspend
4308 * @ap: port the device is connected to
4309 * @dev: the device to suspend
4311 * Flush the cache on the drive, if appropriate, then issue a
4312 * standbynow command.
4314 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4316 if (!ata_dev_enabled(dev))
4318 if (dev->class == ATA_DEV_ATA)
4319 ata_flush_cache(ap, dev);
4321 if (state.event != PM_EVENT_FREEZE)
4322 ata_standby_drive(ap, dev);
4323 ap->flags |= ATA_FLAG_SUSPENDED;
4328 * ata_port_start - Set port up for dma.
4329 * @ap: Port to initialize
4331 * Called just after data structures for each port are
4332 * initialized. Allocates space for PRD table.
4334 * May be used as the port_start() entry in ata_port_operations.
4337 * Inherited from caller.
4340 int ata_port_start (struct ata_port *ap)
4342 struct device *dev = ap->dev;
4345 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4349 rc = ata_pad_alloc(ap, dev);
4351 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4355 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4362 * ata_port_stop - Undo ata_port_start()
4363 * @ap: Port to shut down
4365 * Frees the PRD table.
4367 * May be used as the port_stop() entry in ata_port_operations.
4370 * Inherited from caller.
4373 void ata_port_stop (struct ata_port *ap)
4375 struct device *dev = ap->dev;
4377 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4378 ata_pad_free(ap, dev);
4381 void ata_host_stop (struct ata_host_set *host_set)
4383 if (host_set->mmio_base)
4384 iounmap(host_set->mmio_base);
4389 * ata_host_remove - Unregister SCSI host structure with upper layers
4390 * @ap: Port to unregister
4391 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4394 * Inherited from caller.
4397 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4399 struct Scsi_Host *sh = ap->host;
4404 scsi_remove_host(sh);
4406 ap->ops->port_stop(ap);
4410 * ata_host_init - Initialize an ata_port structure
4411 * @ap: Structure to initialize
4412 * @host: associated SCSI mid-layer structure
4413 * @host_set: Collection of hosts to which @ap belongs
4414 * @ent: Probe information provided by low-level driver
4415 * @port_no: Port number associated with this ata_port
4417 * Initialize a new ata_port structure, and its associated
4421 * Inherited from caller.
4424 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4425 struct ata_host_set *host_set,
4426 const struct ata_probe_ent *ent, unsigned int port_no)
4432 host->max_channel = 1;
4433 host->unique_id = ata_unique_id++;
4434 host->max_cmd_len = 12;
4436 ap->flags = ATA_FLAG_PORT_DISABLED;
4437 ap->id = host->unique_id;
4439 ap->ctl = ATA_DEVCTL_OBS;
4440 ap->host_set = host_set;
4442 ap->port_no = port_no;
4444 ent->legacy_mode ? ent->hard_port_no : port_no;
4445 ap->pio_mask = ent->pio_mask;
4446 ap->mwdma_mask = ent->mwdma_mask;
4447 ap->udma_mask = ent->udma_mask;
4448 ap->flags |= ent->host_flags;
4449 ap->ops = ent->port_ops;
4450 ap->cbl = ATA_CBL_NONE;
4451 ap->active_tag = ATA_TAG_POISON;
4452 ap->last_ctl = 0xFF;
4454 INIT_WORK(&ap->port_task, NULL, NULL);
4455 INIT_LIST_HEAD(&ap->eh_done_q);
4457 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4458 struct ata_device *dev = &ap->device[i];
4460 dev->pio_mask = UINT_MAX;
4461 dev->mwdma_mask = UINT_MAX;
4462 dev->udma_mask = UINT_MAX;
4466 ap->stats.unhandled_irq = 1;
4467 ap->stats.idle_irq = 1;
4470 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4474 * ata_host_add - Attach low-level ATA driver to system
4475 * @ent: Information provided by low-level driver
4476 * @host_set: Collections of ports to which we add
4477 * @port_no: Port number associated with this host
4479 * Attach low-level ATA driver to system.
4482 * PCI/etc. bus probe sem.
4485 * New ata_port on success, for NULL on error.
4488 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4489 struct ata_host_set *host_set,
4490 unsigned int port_no)
4492 struct Scsi_Host *host;
4493 struct ata_port *ap;
4498 if (!ent->port_ops->probe_reset &&
4499 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4500 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4505 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4509 host->transportt = &ata_scsi_transport_template;
4511 ap = (struct ata_port *) &host->hostdata[0];
4513 ata_host_init(ap, host, host_set, ent, port_no);
4515 rc = ap->ops->port_start(ap);
4522 scsi_host_put(host);
4527 * ata_device_add - Register hardware device with ATA and SCSI layers
4528 * @ent: Probe information describing hardware device to be registered
4530 * This function processes the information provided in the probe
4531 * information struct @ent, allocates the necessary ATA and SCSI
4532 * host information structures, initializes them, and registers
4533 * everything with requisite kernel subsystems.
4535 * This function requests irqs, probes the ATA bus, and probes
4539 * PCI/etc. bus probe sem.
4542 * Number of ports registered. Zero on error (no ports registered).
4545 int ata_device_add(const struct ata_probe_ent *ent)
4547 unsigned int count = 0, i;
4548 struct device *dev = ent->dev;
4549 struct ata_host_set *host_set;
4552 /* alloc a container for our list of ATA ports (buses) */
4553 host_set = kzalloc(sizeof(struct ata_host_set) +
4554 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4557 spin_lock_init(&host_set->lock);
4559 host_set->dev = dev;
4560 host_set->n_ports = ent->n_ports;
4561 host_set->irq = ent->irq;
4562 host_set->mmio_base = ent->mmio_base;
4563 host_set->private_data = ent->private_data;
4564 host_set->ops = ent->port_ops;
4565 host_set->flags = ent->host_set_flags;
4567 /* register each port bound to this device */
4568 for (i = 0; i < ent->n_ports; i++) {
4569 struct ata_port *ap;
4570 unsigned long xfer_mode_mask;
4572 ap = ata_host_add(ent, host_set, i);
4576 host_set->ports[i] = ap;
4577 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4578 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4579 (ap->pio_mask << ATA_SHIFT_PIO);
4581 /* print per-port info to dmesg */
4582 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4583 "bmdma 0x%lX irq %lu\n",
4585 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4586 ata_mode_string(xfer_mode_mask),
4587 ap->ioaddr.cmd_addr,
4588 ap->ioaddr.ctl_addr,
4589 ap->ioaddr.bmdma_addr,
4593 host_set->ops->irq_clear(ap);
4600 /* obtain irq, that is shared between channels */
4601 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4602 DRV_NAME, host_set))
4605 /* perform each probe synchronously */
4606 DPRINTK("probe begin\n");
4607 for (i = 0; i < count; i++) {
4608 struct ata_port *ap;
4611 ap = host_set->ports[i];
4613 DPRINTK("ata%u: bus probe begin\n", ap->id);
4614 rc = ata_bus_probe(ap);
4615 DPRINTK("ata%u: bus probe end\n", ap->id);
4618 /* FIXME: do something useful here?
4619 * Current libata behavior will
4620 * tear down everything when
4621 * the module is removed
4622 * or the h/w is unplugged.
4626 rc = scsi_add_host(ap->host, dev);
4628 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4630 /* FIXME: do something useful here */
4631 /* FIXME: handle unconditional calls to
4632 * scsi_scan_host and ata_host_remove, below,
4638 /* probes are done, now scan each port's disk(s) */
4639 DPRINTK("host probe begin\n");
4640 for (i = 0; i < count; i++) {
4641 struct ata_port *ap = host_set->ports[i];
4643 ata_scsi_scan_host(ap);
4646 dev_set_drvdata(dev, host_set);
4648 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4649 return ent->n_ports; /* success */
4652 for (i = 0; i < count; i++) {
4653 ata_host_remove(host_set->ports[i], 1);
4654 scsi_host_put(host_set->ports[i]->host);
4658 VPRINTK("EXIT, returning 0\n");
4663 * ata_host_set_remove - PCI layer callback for device removal
4664 * @host_set: ATA host set that was removed
4666 * Unregister all objects associated with this host set. Free those
4670 * Inherited from calling layer (may sleep).
4673 void ata_host_set_remove(struct ata_host_set *host_set)
4675 struct ata_port *ap;
4678 for (i = 0; i < host_set->n_ports; i++) {
4679 ap = host_set->ports[i];
4680 scsi_remove_host(ap->host);
4683 free_irq(host_set->irq, host_set);
4685 for (i = 0; i < host_set->n_ports; i++) {
4686 ap = host_set->ports[i];
4688 ata_scsi_release(ap->host);
4690 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4691 struct ata_ioports *ioaddr = &ap->ioaddr;
4693 if (ioaddr->cmd_addr == 0x1f0)
4694 release_region(0x1f0, 8);
4695 else if (ioaddr->cmd_addr == 0x170)
4696 release_region(0x170, 8);
4699 scsi_host_put(ap->host);
4702 if (host_set->ops->host_stop)
4703 host_set->ops->host_stop(host_set);
4709 * ata_scsi_release - SCSI layer callback hook for host unload
4710 * @host: libata host to be unloaded
4712 * Performs all duties necessary to shut down a libata port...
4713 * Kill port kthread, disable port, and release resources.
4716 * Inherited from SCSI layer.
4722 int ata_scsi_release(struct Scsi_Host *host)
4724 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4729 ap->ops->port_disable(ap);
4730 ata_host_remove(ap, 0);
4731 for (i = 0; i < ATA_MAX_DEVICES; i++)
4732 kfree(ap->device[i].id);
4739 * ata_std_ports - initialize ioaddr with standard port offsets.
4740 * @ioaddr: IO address structure to be initialized
4742 * Utility function which initializes data_addr, error_addr,
4743 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4744 * device_addr, status_addr, and command_addr to standard offsets
4745 * relative to cmd_addr.
4747 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4750 void ata_std_ports(struct ata_ioports *ioaddr)
4752 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4753 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4754 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4755 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4756 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4757 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4758 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4759 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4760 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4761 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4767 void ata_pci_host_stop (struct ata_host_set *host_set)
4769 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4771 pci_iounmap(pdev, host_set->mmio_base);
4775 * ata_pci_remove_one - PCI layer callback for device removal
4776 * @pdev: PCI device that was removed
4778 * PCI layer indicates to libata via this hook that
4779 * hot-unplug or module unload event has occurred.
4780 * Handle this by unregistering all objects associated
4781 * with this PCI device. Free those objects. Then finally
4782 * release PCI resources and disable device.
4785 * Inherited from PCI layer (may sleep).
4788 void ata_pci_remove_one (struct pci_dev *pdev)
4790 struct device *dev = pci_dev_to_dev(pdev);
4791 struct ata_host_set *host_set = dev_get_drvdata(dev);
4793 ata_host_set_remove(host_set);
4794 pci_release_regions(pdev);
4795 pci_disable_device(pdev);
4796 dev_set_drvdata(dev, NULL);
4799 /* move to PCI subsystem */
4800 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4802 unsigned long tmp = 0;
4804 switch (bits->width) {
4807 pci_read_config_byte(pdev, bits->reg, &tmp8);
4813 pci_read_config_word(pdev, bits->reg, &tmp16);
4819 pci_read_config_dword(pdev, bits->reg, &tmp32);
4830 return (tmp == bits->val) ? 1 : 0;
4833 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4835 pci_save_state(pdev);
4836 pci_disable_device(pdev);
4837 pci_set_power_state(pdev, PCI_D3hot);
4841 int ata_pci_device_resume(struct pci_dev *pdev)
4843 pci_set_power_state(pdev, PCI_D0);
4844 pci_restore_state(pdev);
4845 pci_enable_device(pdev);
4846 pci_set_master(pdev);
4849 #endif /* CONFIG_PCI */
4852 static int __init ata_init(void)
4854 ata_wq = create_workqueue("ata");
4858 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4862 static void __exit ata_exit(void)
4864 destroy_workqueue(ata_wq);
4867 module_init(ata_init);
4868 module_exit(ata_exit);
4870 static unsigned long ratelimit_time;
4871 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4873 int ata_ratelimit(void)
4876 unsigned long flags;
4878 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4880 if (time_after(jiffies, ratelimit_time)) {
4882 ratelimit_time = jiffies + (HZ/5);
4886 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4892 * libata is essentially a library of internal helper functions for
4893 * low-level ATA host controller drivers. As such, the API/ABI is
4894 * likely to change as new drivers are added and updated.
4895 * Do not depend on ABI/API stability.
4898 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4899 EXPORT_SYMBOL_GPL(ata_std_ports);
4900 EXPORT_SYMBOL_GPL(ata_device_add);
4901 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4902 EXPORT_SYMBOL_GPL(ata_sg_init);
4903 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4904 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4905 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4906 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4907 EXPORT_SYMBOL_GPL(ata_tf_load);
4908 EXPORT_SYMBOL_GPL(ata_tf_read);
4909 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4910 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4911 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4912 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4913 EXPORT_SYMBOL_GPL(ata_check_status);
4914 EXPORT_SYMBOL_GPL(ata_altstatus);
4915 EXPORT_SYMBOL_GPL(ata_exec_command);
4916 EXPORT_SYMBOL_GPL(ata_port_start);
4917 EXPORT_SYMBOL_GPL(ata_port_stop);
4918 EXPORT_SYMBOL_GPL(ata_host_stop);
4919 EXPORT_SYMBOL_GPL(ata_interrupt);
4920 EXPORT_SYMBOL_GPL(ata_qc_prep);
4921 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4922 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4923 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4924 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4925 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4926 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4927 EXPORT_SYMBOL_GPL(ata_port_probe);
4928 EXPORT_SYMBOL_GPL(sata_phy_reset);
4929 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4930 EXPORT_SYMBOL_GPL(ata_bus_reset);
4931 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4932 EXPORT_SYMBOL_GPL(ata_std_softreset);
4933 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4934 EXPORT_SYMBOL_GPL(ata_std_postreset);
4935 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4936 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4937 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4938 EXPORT_SYMBOL_GPL(ata_dev_classify);
4939 EXPORT_SYMBOL_GPL(ata_dev_pair);
4940 EXPORT_SYMBOL_GPL(ata_port_disable);
4941 EXPORT_SYMBOL_GPL(ata_ratelimit);
4942 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4943 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4944 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4945 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4946 EXPORT_SYMBOL_GPL(ata_scsi_error);
4947 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4948 EXPORT_SYMBOL_GPL(ata_scsi_release);
4949 EXPORT_SYMBOL_GPL(ata_host_intr);
4950 EXPORT_SYMBOL_GPL(ata_id_string);
4951 EXPORT_SYMBOL_GPL(ata_id_c_string);
4952 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4953 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4954 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4956 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4957 EXPORT_SYMBOL_GPL(ata_timing_compute);
4958 EXPORT_SYMBOL_GPL(ata_timing_merge);
4961 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4962 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4963 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4964 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4965 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4966 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4967 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4968 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4969 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4970 #endif /* CONFIG_PCI */
4972 EXPORT_SYMBOL_GPL(ata_device_suspend);
4973 EXPORT_SYMBOL_GPL(ata_device_resume);
4974 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4975 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);