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 void ata_set_mode(struct ata_port *ap);
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_present(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_present(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;
1374 /* reset and determine device classes */
1375 for (i = 0; i < ATA_MAX_DEVICES; i++)
1376 classes[i] = ATA_DEV_UNKNOWN;
1378 if (ap->ops->probe_reset) {
1379 rc = ap->ops->probe_reset(ap, classes);
1381 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1385 ap->ops->phy_reset(ap);
1387 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1388 for (i = 0; i < ATA_MAX_DEVICES; i++)
1389 classes[i] = ap->device[i].class;
1394 for (i = 0; i < ATA_MAX_DEVICES; i++)
1395 if (classes[i] == ATA_DEV_UNKNOWN)
1396 classes[i] = ATA_DEV_NONE;
1398 /* read IDENTIFY page and configure devices */
1399 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1400 struct ata_device *dev = &ap->device[i];
1402 dev->class = classes[i];
1404 if (!ata_dev_present(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);
1422 goto err_out_disable;
1424 if (ap->ops->set_mode)
1425 ap->ops->set_mode(ap);
1429 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1430 goto err_out_disable;
1435 ap->ops->port_disable(ap);
1440 * ata_port_probe - Mark port as enabled
1441 * @ap: Port for which we indicate enablement
1443 * Modify @ap data structure such that the system
1444 * thinks that the entire port is enabled.
1446 * LOCKING: host_set lock, or some other form of
1450 void ata_port_probe(struct ata_port *ap)
1452 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1456 * sata_print_link_status - Print SATA link status
1457 * @ap: SATA port to printk link status about
1459 * This function prints link speed and status of a SATA link.
1464 static void sata_print_link_status(struct ata_port *ap)
1468 if (!ap->ops->scr_read)
1471 sstatus = scr_read(ap, SCR_STATUS);
1473 if (sata_dev_present(ap)) {
1474 tmp = (sstatus >> 4) & 0xf;
1475 printk(KERN_INFO "ata%u: SATA link up %s (SStatus %X)\n",
1476 ap->id, sata_spd_string(tmp), sstatus);
1478 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1484 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1485 * @ap: SATA port associated with target SATA PHY.
1487 * This function issues commands to standard SATA Sxxx
1488 * PHY registers, to wake up the phy (and device), and
1489 * clear any reset condition.
1492 * PCI/etc. bus probe sem.
1495 void __sata_phy_reset(struct ata_port *ap)
1498 unsigned long timeout = jiffies + (HZ * 5);
1500 if (ap->flags & ATA_FLAG_SATA_RESET) {
1501 /* issue phy wake/reset */
1502 scr_write_flush(ap, SCR_CONTROL, 0x301);
1503 /* Couldn't find anything in SATA I/II specs, but
1504 * AHCI-1.1 10.4.2 says at least 1 ms. */
1507 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1509 /* wait for phy to become ready, if necessary */
1512 sstatus = scr_read(ap, SCR_STATUS);
1513 if ((sstatus & 0xf) != 1)
1515 } while (time_before(jiffies, timeout));
1517 /* print link status */
1518 sata_print_link_status(ap);
1520 /* TODO: phy layer with polling, timeouts, etc. */
1521 if (sata_dev_present(ap))
1524 ata_port_disable(ap);
1526 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1529 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1530 ata_port_disable(ap);
1534 ap->cbl = ATA_CBL_SATA;
1538 * sata_phy_reset - Reset SATA bus.
1539 * @ap: SATA port associated with target SATA PHY.
1541 * This function resets the SATA bus, and then probes
1542 * the bus for devices.
1545 * PCI/etc. bus probe sem.
1548 void sata_phy_reset(struct ata_port *ap)
1550 __sata_phy_reset(ap);
1551 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1557 * ata_dev_pair - return other device on cable
1561 * Obtain the other device on the same cable, or if none is
1562 * present NULL is returned
1565 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1567 struct ata_device *pair = &ap->device[1 - adev->devno];
1568 if (!ata_dev_present(pair))
1574 * ata_port_disable - Disable port.
1575 * @ap: Port to be disabled.
1577 * Modify @ap data structure such that the system
1578 * thinks that the entire port is disabled, and should
1579 * never attempt to probe or communicate with devices
1582 * LOCKING: host_set lock, or some other form of
1586 void ata_port_disable(struct ata_port *ap)
1588 ap->device[0].class = ATA_DEV_NONE;
1589 ap->device[1].class = ATA_DEV_NONE;
1590 ap->flags |= ATA_FLAG_PORT_DISABLED;
1594 * This mode timing computation functionality is ported over from
1595 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1598 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1599 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1600 * for PIO 5, which is a nonstandard extension and UDMA6, which
1601 * is currently supported only by Maxtor drives.
1604 static const struct ata_timing ata_timing[] = {
1606 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1607 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1608 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1609 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1611 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1612 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1613 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1615 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1617 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1618 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1619 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1621 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1622 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1623 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1625 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1626 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1627 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1629 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1630 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1631 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1633 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1638 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1639 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1641 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1643 q->setup = EZ(t->setup * 1000, T);
1644 q->act8b = EZ(t->act8b * 1000, T);
1645 q->rec8b = EZ(t->rec8b * 1000, T);
1646 q->cyc8b = EZ(t->cyc8b * 1000, T);
1647 q->active = EZ(t->active * 1000, T);
1648 q->recover = EZ(t->recover * 1000, T);
1649 q->cycle = EZ(t->cycle * 1000, T);
1650 q->udma = EZ(t->udma * 1000, UT);
1653 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1654 struct ata_timing *m, unsigned int what)
1656 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1657 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1658 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1659 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1660 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1661 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1662 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1663 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1666 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1668 const struct ata_timing *t;
1670 for (t = ata_timing; t->mode != speed; t++)
1671 if (t->mode == 0xFF)
1676 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1677 struct ata_timing *t, int T, int UT)
1679 const struct ata_timing *s;
1680 struct ata_timing p;
1686 if (!(s = ata_timing_find_mode(speed)))
1689 memcpy(t, s, sizeof(*s));
1692 * If the drive is an EIDE drive, it can tell us it needs extended
1693 * PIO/MW_DMA cycle timing.
1696 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1697 memset(&p, 0, sizeof(p));
1698 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1699 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1700 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1701 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1702 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1704 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1708 * Convert the timing to bus clock counts.
1711 ata_timing_quantize(t, t, T, UT);
1714 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1715 * S.M.A.R.T * and some other commands. We have to ensure that the
1716 * DMA cycle timing is slower/equal than the fastest PIO timing.
1719 if (speed > XFER_PIO_4) {
1720 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1721 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1725 * Lengthen active & recovery time so that cycle time is correct.
1728 if (t->act8b + t->rec8b < t->cyc8b) {
1729 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1730 t->rec8b = t->cyc8b - t->act8b;
1733 if (t->active + t->recover < t->cycle) {
1734 t->active += (t->cycle - (t->active + t->recover)) / 2;
1735 t->recover = t->cycle - t->active;
1741 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1743 unsigned int err_mask;
1746 if (dev->xfer_shift == ATA_SHIFT_PIO)
1747 dev->flags |= ATA_DFLAG_PIO;
1749 err_mask = ata_dev_set_xfermode(ap, dev);
1752 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1757 rc = ata_dev_revalidate(ap, dev, 0);
1760 "ata%u: failed to revalidate after set xfermode\n",
1765 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1766 dev->xfer_shift, (int)dev->xfer_mode);
1768 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1770 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1774 static int ata_host_set_pio(struct ata_port *ap)
1778 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1779 struct ata_device *dev = &ap->device[i];
1781 if (!ata_dev_present(dev))
1784 if (!dev->pio_mode) {
1785 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1789 dev->xfer_mode = dev->pio_mode;
1790 dev->xfer_shift = ATA_SHIFT_PIO;
1791 if (ap->ops->set_piomode)
1792 ap->ops->set_piomode(ap, dev);
1798 static void ata_host_set_dma(struct ata_port *ap)
1802 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1803 struct ata_device *dev = &ap->device[i];
1805 if (!ata_dev_present(dev) || !dev->dma_mode)
1808 dev->xfer_mode = dev->dma_mode;
1809 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1810 if (ap->ops->set_dmamode)
1811 ap->ops->set_dmamode(ap, dev);
1816 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1817 * @ap: port on which timings will be programmed
1819 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1822 * PCI/etc. bus probe sem.
1824 static void ata_set_mode(struct ata_port *ap)
1826 int i, rc, used_dma = 0;
1828 /* step 1: calculate xfer_mask */
1829 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1830 struct ata_device *dev = &ap->device[i];
1831 unsigned int pio_mask, dma_mask;
1833 if (!ata_dev_present(dev))
1836 ata_dev_xfermask(ap, dev);
1838 /* TODO: let LLDD filter dev->*_mask here */
1840 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1841 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1842 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1843 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1849 /* step 2: always set host PIO timings */
1850 rc = ata_host_set_pio(ap);
1854 /* step 3: set host DMA timings */
1855 ata_host_set_dma(ap);
1857 /* step 4: update devices' xfer mode */
1858 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1859 struct ata_device *dev = &ap->device[i];
1861 if (!ata_dev_present(dev))
1864 rc = ata_dev_set_mode(ap, dev);
1870 * Record simplex status. If we selected DMA then the other
1871 * host channels are not permitted to do so.
1874 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
1875 ap->host_set->simplex_claimed = 1;
1878 * Chip specific finalisation
1880 if (ap->ops->post_set_mode)
1881 ap->ops->post_set_mode(ap);
1886 ata_port_disable(ap);
1890 * ata_tf_to_host - issue ATA taskfile to host controller
1891 * @ap: port to which command is being issued
1892 * @tf: ATA taskfile register set
1894 * Issues ATA taskfile register set to ATA host controller,
1895 * with proper synchronization with interrupt handler and
1899 * spin_lock_irqsave(host_set lock)
1902 static inline void ata_tf_to_host(struct ata_port *ap,
1903 const struct ata_taskfile *tf)
1905 ap->ops->tf_load(ap, tf);
1906 ap->ops->exec_command(ap, tf);
1910 * ata_busy_sleep - sleep until BSY clears, or timeout
1911 * @ap: port containing status register to be polled
1912 * @tmout_pat: impatience timeout
1913 * @tmout: overall timeout
1915 * Sleep until ATA Status register bit BSY clears,
1916 * or a timeout occurs.
1921 unsigned int ata_busy_sleep (struct ata_port *ap,
1922 unsigned long tmout_pat, unsigned long tmout)
1924 unsigned long timer_start, timeout;
1927 status = ata_busy_wait(ap, ATA_BUSY, 300);
1928 timer_start = jiffies;
1929 timeout = timer_start + tmout_pat;
1930 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1932 status = ata_busy_wait(ap, ATA_BUSY, 3);
1935 if (status & ATA_BUSY)
1936 printk(KERN_WARNING "ata%u is slow to respond, "
1937 "please be patient\n", ap->id);
1939 timeout = timer_start + tmout;
1940 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1942 status = ata_chk_status(ap);
1945 if (status & ATA_BUSY) {
1946 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1947 ap->id, tmout / HZ);
1954 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1956 struct ata_ioports *ioaddr = &ap->ioaddr;
1957 unsigned int dev0 = devmask & (1 << 0);
1958 unsigned int dev1 = devmask & (1 << 1);
1959 unsigned long timeout;
1961 /* if device 0 was found in ata_devchk, wait for its
1965 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1967 /* if device 1 was found in ata_devchk, wait for
1968 * register access, then wait for BSY to clear
1970 timeout = jiffies + ATA_TMOUT_BOOT;
1974 ap->ops->dev_select(ap, 1);
1975 if (ap->flags & ATA_FLAG_MMIO) {
1976 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1977 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1979 nsect = inb(ioaddr->nsect_addr);
1980 lbal = inb(ioaddr->lbal_addr);
1982 if ((nsect == 1) && (lbal == 1))
1984 if (time_after(jiffies, timeout)) {
1988 msleep(50); /* give drive a breather */
1991 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1993 /* is all this really necessary? */
1994 ap->ops->dev_select(ap, 0);
1996 ap->ops->dev_select(ap, 1);
1998 ap->ops->dev_select(ap, 0);
2001 static unsigned int ata_bus_softreset(struct ata_port *ap,
2002 unsigned int devmask)
2004 struct ata_ioports *ioaddr = &ap->ioaddr;
2006 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2008 /* software reset. causes dev0 to be selected */
2009 if (ap->flags & ATA_FLAG_MMIO) {
2010 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2011 udelay(20); /* FIXME: flush */
2012 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2013 udelay(20); /* FIXME: flush */
2014 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2016 outb(ap->ctl, ioaddr->ctl_addr);
2018 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2020 outb(ap->ctl, ioaddr->ctl_addr);
2023 /* spec mandates ">= 2ms" before checking status.
2024 * We wait 150ms, because that was the magic delay used for
2025 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2026 * between when the ATA command register is written, and then
2027 * status is checked. Because waiting for "a while" before
2028 * checking status is fine, post SRST, we perform this magic
2029 * delay here as well.
2031 * Old drivers/ide uses the 2mS rule and then waits for ready
2035 /* Before we perform post reset processing we want to see if
2036 * the bus shows 0xFF because the odd clown forgets the D7
2037 * pulldown resistor.
2039 if (ata_check_status(ap) == 0xFF)
2040 return AC_ERR_OTHER;
2042 ata_bus_post_reset(ap, devmask);
2048 * ata_bus_reset - reset host port and associated ATA channel
2049 * @ap: port to reset
2051 * This is typically the first time we actually start issuing
2052 * commands to the ATA channel. We wait for BSY to clear, then
2053 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2054 * result. Determine what devices, if any, are on the channel
2055 * by looking at the device 0/1 error register. Look at the signature
2056 * stored in each device's taskfile registers, to determine if
2057 * the device is ATA or ATAPI.
2060 * PCI/etc. bus probe sem.
2061 * Obtains host_set lock.
2064 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2067 void ata_bus_reset(struct ata_port *ap)
2069 struct ata_ioports *ioaddr = &ap->ioaddr;
2070 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2072 unsigned int dev0, dev1 = 0, devmask = 0;
2074 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2076 /* determine if device 0/1 are present */
2077 if (ap->flags & ATA_FLAG_SATA_RESET)
2080 dev0 = ata_devchk(ap, 0);
2082 dev1 = ata_devchk(ap, 1);
2086 devmask |= (1 << 0);
2088 devmask |= (1 << 1);
2090 /* select device 0 again */
2091 ap->ops->dev_select(ap, 0);
2093 /* issue bus reset */
2094 if (ap->flags & ATA_FLAG_SRST)
2095 if (ata_bus_softreset(ap, devmask))
2099 * determine by signature whether we have ATA or ATAPI devices
2101 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2102 if ((slave_possible) && (err != 0x81))
2103 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2105 /* re-enable interrupts */
2106 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2109 /* is double-select really necessary? */
2110 if (ap->device[1].class != ATA_DEV_NONE)
2111 ap->ops->dev_select(ap, 1);
2112 if (ap->device[0].class != ATA_DEV_NONE)
2113 ap->ops->dev_select(ap, 0);
2115 /* if no devices were detected, disable this port */
2116 if ((ap->device[0].class == ATA_DEV_NONE) &&
2117 (ap->device[1].class == ATA_DEV_NONE))
2120 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2121 /* set up device control for ATA_FLAG_SATA_RESET */
2122 if (ap->flags & ATA_FLAG_MMIO)
2123 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2125 outb(ap->ctl, ioaddr->ctl_addr);
2132 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2133 ap->ops->port_disable(ap);
2138 static int sata_phy_resume(struct ata_port *ap)
2140 unsigned long timeout = jiffies + (HZ * 5);
2143 scr_write_flush(ap, SCR_CONTROL, 0x300);
2145 /* Wait for phy to become ready, if necessary. */
2148 sstatus = scr_read(ap, SCR_STATUS);
2149 if ((sstatus & 0xf) != 1)
2151 } while (time_before(jiffies, timeout));
2157 * ata_std_probeinit - initialize probing
2158 * @ap: port to be probed
2160 * @ap is about to be probed. Initialize it. This function is
2161 * to be used as standard callback for ata_drive_probe_reset().
2163 * NOTE!!! Do not use this function as probeinit if a low level
2164 * driver implements only hardreset. Just pass NULL as probeinit
2165 * in that case. Using this function is probably okay but doing
2166 * so makes reset sequence different from the original
2167 * ->phy_reset implementation and Jeff nervous. :-P
2169 void ata_std_probeinit(struct ata_port *ap)
2171 if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
2172 sata_phy_resume(ap);
2173 if (sata_dev_present(ap))
2174 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2179 * ata_std_softreset - reset host port via ATA SRST
2180 * @ap: port to reset
2181 * @verbose: fail verbosely
2182 * @classes: resulting classes of attached devices
2184 * Reset host port using ATA SRST. This function is to be used
2185 * as standard callback for ata_drive_*_reset() functions.
2188 * Kernel thread context (may sleep)
2191 * 0 on success, -errno otherwise.
2193 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2195 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2196 unsigned int devmask = 0, err_mask;
2201 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2202 classes[0] = ATA_DEV_NONE;
2206 /* determine if device 0/1 are present */
2207 if (ata_devchk(ap, 0))
2208 devmask |= (1 << 0);
2209 if (slave_possible && ata_devchk(ap, 1))
2210 devmask |= (1 << 1);
2212 /* select device 0 again */
2213 ap->ops->dev_select(ap, 0);
2215 /* issue bus reset */
2216 DPRINTK("about to softreset, devmask=%x\n", devmask);
2217 err_mask = ata_bus_softreset(ap, devmask);
2220 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2223 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2228 /* determine by signature whether we have ATA or ATAPI devices */
2229 classes[0] = ata_dev_try_classify(ap, 0, &err);
2230 if (slave_possible && err != 0x81)
2231 classes[1] = ata_dev_try_classify(ap, 1, &err);
2234 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2239 * sata_std_hardreset - reset host port via SATA phy reset
2240 * @ap: port to reset
2241 * @verbose: fail verbosely
2242 * @class: resulting class of attached device
2244 * SATA phy-reset host port using DET bits of SControl register.
2245 * This function is to be used as standard callback for
2246 * ata_drive_*_reset().
2249 * Kernel thread context (may sleep)
2252 * 0 on success, -errno otherwise.
2254 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2258 /* Issue phy wake/reset */
2259 scr_write_flush(ap, SCR_CONTROL, 0x301);
2262 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2263 * 10.4.2 says at least 1 ms.
2267 /* Bring phy back */
2268 sata_phy_resume(ap);
2270 /* TODO: phy layer with polling, timeouts, etc. */
2271 if (!sata_dev_present(ap)) {
2272 *class = ATA_DEV_NONE;
2273 DPRINTK("EXIT, link offline\n");
2277 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2279 printk(KERN_ERR "ata%u: COMRESET failed "
2280 "(device not ready)\n", ap->id);
2282 DPRINTK("EXIT, device not ready\n");
2286 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2288 *class = ata_dev_try_classify(ap, 0, NULL);
2290 DPRINTK("EXIT, class=%u\n", *class);
2295 * ata_std_postreset - standard postreset callback
2296 * @ap: the target ata_port
2297 * @classes: classes of attached devices
2299 * This function is invoked after a successful reset. Note that
2300 * the device might have been reset more than once using
2301 * different reset methods before postreset is invoked.
2303 * This function is to be used as standard callback for
2304 * ata_drive_*_reset().
2307 * Kernel thread context (may sleep)
2309 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2313 /* set cable type if it isn't already set */
2314 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2315 ap->cbl = ATA_CBL_SATA;
2317 /* print link status */
2318 if (ap->cbl == ATA_CBL_SATA)
2319 sata_print_link_status(ap);
2321 /* re-enable interrupts */
2322 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2325 /* is double-select really necessary? */
2326 if (classes[0] != ATA_DEV_NONE)
2327 ap->ops->dev_select(ap, 1);
2328 if (classes[1] != ATA_DEV_NONE)
2329 ap->ops->dev_select(ap, 0);
2331 /* bail out if no device is present */
2332 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2333 DPRINTK("EXIT, no device\n");
2337 /* set up device control */
2338 if (ap->ioaddr.ctl_addr) {
2339 if (ap->flags & ATA_FLAG_MMIO)
2340 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2342 outb(ap->ctl, ap->ioaddr.ctl_addr);
2349 * ata_std_probe_reset - standard probe reset method
2350 * @ap: prot to perform probe-reset
2351 * @classes: resulting classes of attached devices
2353 * The stock off-the-shelf ->probe_reset method.
2356 * Kernel thread context (may sleep)
2359 * 0 on success, -errno otherwise.
2361 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2363 ata_reset_fn_t hardreset;
2366 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2367 hardreset = sata_std_hardreset;
2369 return ata_drive_probe_reset(ap, ata_std_probeinit,
2370 ata_std_softreset, hardreset,
2371 ata_std_postreset, classes);
2374 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2375 ata_postreset_fn_t postreset,
2376 unsigned int *classes)
2380 for (i = 0; i < ATA_MAX_DEVICES; i++)
2381 classes[i] = ATA_DEV_UNKNOWN;
2383 rc = reset(ap, 0, classes);
2387 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2388 * is complete and convert all ATA_DEV_UNKNOWN to
2391 for (i = 0; i < ATA_MAX_DEVICES; i++)
2392 if (classes[i] != ATA_DEV_UNKNOWN)
2395 if (i < ATA_MAX_DEVICES)
2396 for (i = 0; i < ATA_MAX_DEVICES; i++)
2397 if (classes[i] == ATA_DEV_UNKNOWN)
2398 classes[i] = ATA_DEV_NONE;
2401 postreset(ap, classes);
2403 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2407 * ata_drive_probe_reset - Perform probe reset with given methods
2408 * @ap: port to reset
2409 * @probeinit: probeinit method (can be NULL)
2410 * @softreset: softreset method (can be NULL)
2411 * @hardreset: hardreset method (can be NULL)
2412 * @postreset: postreset method (can be NULL)
2413 * @classes: resulting classes of attached devices
2415 * Reset the specified port and classify attached devices using
2416 * given methods. This function prefers softreset but tries all
2417 * possible reset sequences to reset and classify devices. This
2418 * function is intended to be used for constructing ->probe_reset
2419 * callback by low level drivers.
2421 * Reset methods should follow the following rules.
2423 * - Return 0 on sucess, -errno on failure.
2424 * - If classification is supported, fill classes[] with
2425 * recognized class codes.
2426 * - If classification is not supported, leave classes[] alone.
2427 * - If verbose is non-zero, print error message on failure;
2428 * otherwise, shut up.
2431 * Kernel thread context (may sleep)
2434 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2435 * if classification fails, and any error code from reset
2438 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2439 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2440 ata_postreset_fn_t postreset, unsigned int *classes)
2448 rc = do_probe_reset(ap, softreset, postreset, classes);
2456 rc = do_probe_reset(ap, hardreset, postreset, classes);
2457 if (rc == 0 || rc != -ENODEV)
2461 rc = do_probe_reset(ap, softreset, postreset, classes);
2467 * ata_dev_same_device - Determine whether new ID matches configured device
2468 * @ap: port on which the device to compare against resides
2469 * @dev: device to compare against
2470 * @new_class: class of the new device
2471 * @new_id: IDENTIFY page of the new device
2473 * Compare @new_class and @new_id against @dev and determine
2474 * whether @dev is the device indicated by @new_class and
2481 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2483 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2484 unsigned int new_class, const u16 *new_id)
2486 const u16 *old_id = dev->id;
2487 unsigned char model[2][41], serial[2][21];
2490 if (dev->class != new_class) {
2492 "ata%u: dev %u class mismatch %d != %d\n",
2493 ap->id, dev->devno, dev->class, new_class);
2497 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2498 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2499 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2500 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2501 new_n_sectors = ata_id_n_sectors(new_id);
2503 if (strcmp(model[0], model[1])) {
2505 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2506 ap->id, dev->devno, model[0], model[1]);
2510 if (strcmp(serial[0], serial[1])) {
2512 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2513 ap->id, dev->devno, serial[0], serial[1]);
2517 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2519 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2520 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2521 (unsigned long long)new_n_sectors);
2529 * ata_dev_revalidate - Revalidate ATA device
2530 * @ap: port on which the device to revalidate resides
2531 * @dev: device to revalidate
2532 * @post_reset: is this revalidation after reset?
2534 * Re-read IDENTIFY page and make sure @dev is still attached to
2538 * Kernel thread context (may sleep)
2541 * 0 on success, negative errno otherwise
2543 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2550 if (!ata_dev_present(dev))
2556 /* allocate & read ID data */
2557 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2561 /* is the device still there? */
2562 if (!ata_dev_same_device(ap, dev, class, id)) {
2570 /* configure device according to the new ID */
2571 return ata_dev_configure(ap, dev, 0);
2574 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2575 ap->id, dev->devno, rc);
2580 static const char * const ata_dma_blacklist [] = {
2581 "WDC AC11000H", NULL,
2582 "WDC AC22100H", NULL,
2583 "WDC AC32500H", NULL,
2584 "WDC AC33100H", NULL,
2585 "WDC AC31600H", NULL,
2586 "WDC AC32100H", "24.09P07",
2587 "WDC AC23200L", "21.10N21",
2588 "Compaq CRD-8241B", NULL,
2593 "SanDisk SDP3B", NULL,
2594 "SanDisk SDP3B-64", NULL,
2595 "SANYO CD-ROM CRD", NULL,
2596 "HITACHI CDR-8", NULL,
2597 "HITACHI CDR-8335", NULL,
2598 "HITACHI CDR-8435", NULL,
2599 "Toshiba CD-ROM XM-6202B", NULL,
2600 "TOSHIBA CD-ROM XM-1702BC", NULL,
2602 "E-IDE CD-ROM CR-840", NULL,
2603 "CD-ROM Drive/F5A", NULL,
2604 "WPI CDD-820", NULL,
2605 "SAMSUNG CD-ROM SC-148C", NULL,
2606 "SAMSUNG CD-ROM SC", NULL,
2607 "SanDisk SDP3B-64", NULL,
2608 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2609 "_NEC DV5800A", NULL,
2610 "SAMSUNG CD-ROM SN-124", "N001"
2613 static int ata_strim(char *s, size_t len)
2615 len = strnlen(s, len);
2617 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2618 while ((len > 0) && (s[len - 1] == ' ')) {
2625 static int ata_dma_blacklisted(const struct ata_device *dev)
2627 unsigned char model_num[40];
2628 unsigned char model_rev[16];
2629 unsigned int nlen, rlen;
2632 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2634 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2636 nlen = ata_strim(model_num, sizeof(model_num));
2637 rlen = ata_strim(model_rev, sizeof(model_rev));
2639 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2640 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2641 if (ata_dma_blacklist[i+1] == NULL)
2643 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2651 * ata_dev_xfermask - Compute supported xfermask of the given device
2652 * @ap: Port on which the device to compute xfermask for resides
2653 * @dev: Device to compute xfermask for
2655 * Compute supported xfermask of @dev and store it in
2656 * dev->*_mask. This function is responsible for applying all
2657 * known limits including host controller limits, device
2660 * FIXME: The current implementation limits all transfer modes to
2661 * the fastest of the lowested device on the port. This is not
2662 * required on most controllers.
2667 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2669 struct ata_host_set *hs = ap->host_set;
2670 unsigned long xfer_mask;
2673 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2676 /* FIXME: Use port-wide xfermask for now */
2677 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2678 struct ata_device *d = &ap->device[i];
2679 if (!ata_dev_present(d))
2681 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2683 xfer_mask &= ata_id_xfermask(d->id);
2684 if (ata_dma_blacklisted(d))
2685 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2686 /* Apply cable rule here. Don't apply it early because when
2687 we handle hot plug the cable type can itself change */
2688 if (ap->cbl == ATA_CBL_PATA40)
2689 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2692 if (ata_dma_blacklisted(dev))
2693 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2694 "disabling DMA\n", ap->id, dev->devno);
2696 if (hs->flags & ATA_HOST_SIMPLEX) {
2697 if (hs->simplex_claimed)
2698 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2700 if (ap->ops->mode_filter)
2701 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2703 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2708 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2709 * @ap: Port associated with device @dev
2710 * @dev: Device to which command will be sent
2712 * Issue SET FEATURES - XFER MODE command to device @dev
2716 * PCI/etc. bus probe sem.
2719 * 0 on success, AC_ERR_* mask otherwise.
2722 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2723 struct ata_device *dev)
2725 struct ata_taskfile tf;
2726 unsigned int err_mask;
2728 /* set up set-features taskfile */
2729 DPRINTK("set features - xfer mode\n");
2731 ata_tf_init(ap, &tf, dev->devno);
2732 tf.command = ATA_CMD_SET_FEATURES;
2733 tf.feature = SETFEATURES_XFER;
2734 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2735 tf.protocol = ATA_PROT_NODATA;
2736 tf.nsect = dev->xfer_mode;
2738 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2740 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2745 * ata_dev_init_params - Issue INIT DEV PARAMS command
2746 * @ap: Port associated with device @dev
2747 * @dev: Device to which command will be sent
2750 * Kernel thread context (may sleep)
2753 * 0 on success, AC_ERR_* mask otherwise.
2756 static unsigned int ata_dev_init_params(struct ata_port *ap,
2757 struct ata_device *dev,
2761 struct ata_taskfile tf;
2762 unsigned int err_mask;
2764 /* Number of sectors per track 1-255. Number of heads 1-16 */
2765 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2766 return AC_ERR_INVALID;
2768 /* set up init dev params taskfile */
2769 DPRINTK("init dev params \n");
2771 ata_tf_init(ap, &tf, dev->devno);
2772 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2773 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2774 tf.protocol = ATA_PROT_NODATA;
2776 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2778 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2780 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2785 * ata_sg_clean - Unmap DMA memory associated with command
2786 * @qc: Command containing DMA memory to be released
2788 * Unmap all mapped DMA memory associated with this command.
2791 * spin_lock_irqsave(host_set lock)
2794 static void ata_sg_clean(struct ata_queued_cmd *qc)
2796 struct ata_port *ap = qc->ap;
2797 struct scatterlist *sg = qc->__sg;
2798 int dir = qc->dma_dir;
2799 void *pad_buf = NULL;
2801 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2802 WARN_ON(sg == NULL);
2804 if (qc->flags & ATA_QCFLAG_SINGLE)
2805 WARN_ON(qc->n_elem > 1);
2807 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2809 /* if we padded the buffer out to 32-bit bound, and data
2810 * xfer direction is from-device, we must copy from the
2811 * pad buffer back into the supplied buffer
2813 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2814 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2816 if (qc->flags & ATA_QCFLAG_SG) {
2818 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
2819 /* restore last sg */
2820 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2822 struct scatterlist *psg = &qc->pad_sgent;
2823 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2824 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2825 kunmap_atomic(addr, KM_IRQ0);
2829 dma_unmap_single(ap->dev,
2830 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2833 sg->length += qc->pad_len;
2835 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2836 pad_buf, qc->pad_len);
2839 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2844 * ata_fill_sg - Fill PCI IDE PRD table
2845 * @qc: Metadata associated with taskfile to be transferred
2847 * Fill PCI IDE PRD (scatter-gather) table with segments
2848 * associated with the current disk command.
2851 * spin_lock_irqsave(host_set lock)
2854 static void ata_fill_sg(struct ata_queued_cmd *qc)
2856 struct ata_port *ap = qc->ap;
2857 struct scatterlist *sg;
2860 WARN_ON(qc->__sg == NULL);
2861 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2864 ata_for_each_sg(sg, qc) {
2868 /* determine if physical DMA addr spans 64K boundary.
2869 * Note h/w doesn't support 64-bit, so we unconditionally
2870 * truncate dma_addr_t to u32.
2872 addr = (u32) sg_dma_address(sg);
2873 sg_len = sg_dma_len(sg);
2876 offset = addr & 0xffff;
2878 if ((offset + sg_len) > 0x10000)
2879 len = 0x10000 - offset;
2881 ap->prd[idx].addr = cpu_to_le32(addr);
2882 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2883 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2892 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2895 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2896 * @qc: Metadata associated with taskfile to check
2898 * Allow low-level driver to filter ATA PACKET commands, returning
2899 * a status indicating whether or not it is OK to use DMA for the
2900 * supplied PACKET command.
2903 * spin_lock_irqsave(host_set lock)
2905 * RETURNS: 0 when ATAPI DMA can be used
2908 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2910 struct ata_port *ap = qc->ap;
2911 int rc = 0; /* Assume ATAPI DMA is OK by default */
2913 if (ap->ops->check_atapi_dma)
2914 rc = ap->ops->check_atapi_dma(qc);
2919 * ata_qc_prep - Prepare taskfile for submission
2920 * @qc: Metadata associated with taskfile to be prepared
2922 * Prepare ATA taskfile for submission.
2925 * spin_lock_irqsave(host_set lock)
2927 void ata_qc_prep(struct ata_queued_cmd *qc)
2929 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2935 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2938 * ata_sg_init_one - Associate command with memory buffer
2939 * @qc: Command to be associated
2940 * @buf: Memory buffer
2941 * @buflen: Length of memory buffer, in bytes.
2943 * Initialize the data-related elements of queued_cmd @qc
2944 * to point to a single memory buffer, @buf of byte length @buflen.
2947 * spin_lock_irqsave(host_set lock)
2950 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2952 struct scatterlist *sg;
2954 qc->flags |= ATA_QCFLAG_SINGLE;
2956 memset(&qc->sgent, 0, sizeof(qc->sgent));
2957 qc->__sg = &qc->sgent;
2959 qc->orig_n_elem = 1;
2963 sg_init_one(sg, buf, buflen);
2967 * ata_sg_init - Associate command with scatter-gather table.
2968 * @qc: Command to be associated
2969 * @sg: Scatter-gather table.
2970 * @n_elem: Number of elements in s/g table.
2972 * Initialize the data-related elements of queued_cmd @qc
2973 * to point to a scatter-gather table @sg, containing @n_elem
2977 * spin_lock_irqsave(host_set lock)
2980 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2981 unsigned int n_elem)
2983 qc->flags |= ATA_QCFLAG_SG;
2985 qc->n_elem = n_elem;
2986 qc->orig_n_elem = n_elem;
2990 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2991 * @qc: Command with memory buffer to be mapped.
2993 * DMA-map the memory buffer associated with queued_cmd @qc.
2996 * spin_lock_irqsave(host_set lock)
2999 * Zero on success, negative on error.
3002 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3004 struct ata_port *ap = qc->ap;
3005 int dir = qc->dma_dir;
3006 struct scatterlist *sg = qc->__sg;
3007 dma_addr_t dma_address;
3010 /* we must lengthen transfers to end on a 32-bit boundary */
3011 qc->pad_len = sg->length & 3;
3013 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3014 struct scatterlist *psg = &qc->pad_sgent;
3016 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3018 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3020 if (qc->tf.flags & ATA_TFLAG_WRITE)
3021 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3024 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3025 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3027 sg->length -= qc->pad_len;
3028 if (sg->length == 0)
3031 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3032 sg->length, qc->pad_len);
3040 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3042 if (dma_mapping_error(dma_address)) {
3044 sg->length += qc->pad_len;
3048 sg_dma_address(sg) = dma_address;
3049 sg_dma_len(sg) = sg->length;
3052 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3053 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3059 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3060 * @qc: Command with scatter-gather table to be mapped.
3062 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3065 * spin_lock_irqsave(host_set lock)
3068 * Zero on success, negative on error.
3072 static int ata_sg_setup(struct ata_queued_cmd *qc)
3074 struct ata_port *ap = qc->ap;
3075 struct scatterlist *sg = qc->__sg;
3076 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3077 int n_elem, pre_n_elem, dir, trim_sg = 0;
3079 VPRINTK("ENTER, ata%u\n", ap->id);
3080 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3082 /* we must lengthen transfers to end on a 32-bit boundary */
3083 qc->pad_len = lsg->length & 3;
3085 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3086 struct scatterlist *psg = &qc->pad_sgent;
3087 unsigned int offset;
3089 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3091 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3094 * psg->page/offset are used to copy to-be-written
3095 * data in this function or read data in ata_sg_clean.
3097 offset = lsg->offset + lsg->length - qc->pad_len;
3098 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3099 psg->offset = offset_in_page(offset);
3101 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3102 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3103 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3104 kunmap_atomic(addr, KM_IRQ0);
3107 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3108 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3110 lsg->length -= qc->pad_len;
3111 if (lsg->length == 0)
3114 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3115 qc->n_elem - 1, lsg->length, qc->pad_len);
3118 pre_n_elem = qc->n_elem;
3119 if (trim_sg && pre_n_elem)
3128 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3130 /* restore last sg */
3131 lsg->length += qc->pad_len;
3135 DPRINTK("%d sg elements mapped\n", n_elem);
3138 qc->n_elem = n_elem;
3144 * ata_poll_qc_complete - turn irq back on and finish qc
3145 * @qc: Command to complete
3146 * @err_mask: ATA status register content
3149 * None. (grabs host lock)
3152 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3154 struct ata_port *ap = qc->ap;
3155 unsigned long flags;
3157 spin_lock_irqsave(&ap->host_set->lock, flags);
3158 ap->flags &= ~ATA_FLAG_NOINTR;
3160 ata_qc_complete(qc);
3161 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3165 * ata_pio_poll - poll using PIO, depending on current state
3166 * @ap: the target ata_port
3169 * None. (executing in kernel thread context)
3172 * timeout value to use
3175 static unsigned long ata_pio_poll(struct ata_port *ap)
3177 struct ata_queued_cmd *qc;
3179 unsigned int poll_state = HSM_ST_UNKNOWN;
3180 unsigned int reg_state = HSM_ST_UNKNOWN;
3182 qc = ata_qc_from_tag(ap, ap->active_tag);
3183 WARN_ON(qc == NULL);
3185 switch (ap->hsm_task_state) {
3188 poll_state = HSM_ST_POLL;
3192 case HSM_ST_LAST_POLL:
3193 poll_state = HSM_ST_LAST_POLL;
3194 reg_state = HSM_ST_LAST;
3201 status = ata_chk_status(ap);
3202 if (status & ATA_BUSY) {
3203 if (time_after(jiffies, ap->pio_task_timeout)) {
3204 qc->err_mask |= AC_ERR_TIMEOUT;
3205 ap->hsm_task_state = HSM_ST_TMOUT;
3208 ap->hsm_task_state = poll_state;
3209 return ATA_SHORT_PAUSE;
3212 ap->hsm_task_state = reg_state;
3217 * ata_pio_complete - check if drive is busy or idle
3218 * @ap: the target ata_port
3221 * None. (executing in kernel thread context)
3224 * Non-zero if qc completed, zero otherwise.
3227 static int ata_pio_complete (struct ata_port *ap)
3229 struct ata_queued_cmd *qc;
3233 * This is purely heuristic. This is a fast path. Sometimes when
3234 * we enter, BSY will be cleared in a chk-status or two. If not,
3235 * the drive is probably seeking or something. Snooze for a couple
3236 * msecs, then chk-status again. If still busy, fall back to
3237 * HSM_ST_POLL state.
3239 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3240 if (drv_stat & ATA_BUSY) {
3242 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3243 if (drv_stat & ATA_BUSY) {
3244 ap->hsm_task_state = HSM_ST_LAST_POLL;
3245 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3250 qc = ata_qc_from_tag(ap, ap->active_tag);
3251 WARN_ON(qc == NULL);
3253 drv_stat = ata_wait_idle(ap);
3254 if (!ata_ok(drv_stat)) {
3255 qc->err_mask |= __ac_err_mask(drv_stat);
3256 ap->hsm_task_state = HSM_ST_ERR;
3260 ap->hsm_task_state = HSM_ST_IDLE;
3262 WARN_ON(qc->err_mask);
3263 ata_poll_qc_complete(qc);
3265 /* another command may start at this point */
3272 * swap_buf_le16 - swap halves of 16-bit words in place
3273 * @buf: Buffer to swap
3274 * @buf_words: Number of 16-bit words in buffer.
3276 * Swap halves of 16-bit words if needed to convert from
3277 * little-endian byte order to native cpu byte order, or
3281 * Inherited from caller.
3283 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3288 for (i = 0; i < buf_words; i++)
3289 buf[i] = le16_to_cpu(buf[i]);
3290 #endif /* __BIG_ENDIAN */
3294 * ata_mmio_data_xfer - Transfer data by MMIO
3295 * @ap: port to read/write
3297 * @buflen: buffer length
3298 * @write_data: read/write
3300 * Transfer data from/to the device data register by MMIO.
3303 * Inherited from caller.
3306 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3307 unsigned int buflen, int write_data)
3310 unsigned int words = buflen >> 1;
3311 u16 *buf16 = (u16 *) buf;
3312 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3314 /* Transfer multiple of 2 bytes */
3316 for (i = 0; i < words; i++)
3317 writew(le16_to_cpu(buf16[i]), mmio);
3319 for (i = 0; i < words; i++)
3320 buf16[i] = cpu_to_le16(readw(mmio));
3323 /* Transfer trailing 1 byte, if any. */
3324 if (unlikely(buflen & 0x01)) {
3325 u16 align_buf[1] = { 0 };
3326 unsigned char *trailing_buf = buf + buflen - 1;
3329 memcpy(align_buf, trailing_buf, 1);
3330 writew(le16_to_cpu(align_buf[0]), mmio);
3332 align_buf[0] = cpu_to_le16(readw(mmio));
3333 memcpy(trailing_buf, align_buf, 1);
3339 * ata_pio_data_xfer - Transfer data by PIO
3340 * @ap: port to read/write
3342 * @buflen: buffer length
3343 * @write_data: read/write
3345 * Transfer data from/to the device data register by PIO.
3348 * Inherited from caller.
3351 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3352 unsigned int buflen, int write_data)
3354 unsigned int words = buflen >> 1;
3356 /* Transfer multiple of 2 bytes */
3358 outsw(ap->ioaddr.data_addr, buf, words);
3360 insw(ap->ioaddr.data_addr, buf, words);
3362 /* Transfer trailing 1 byte, if any. */
3363 if (unlikely(buflen & 0x01)) {
3364 u16 align_buf[1] = { 0 };
3365 unsigned char *trailing_buf = buf + buflen - 1;
3368 memcpy(align_buf, trailing_buf, 1);
3369 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3371 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3372 memcpy(trailing_buf, align_buf, 1);
3378 * ata_data_xfer - Transfer data from/to the data register.
3379 * @ap: port to read/write
3381 * @buflen: buffer length
3382 * @do_write: read/write
3384 * Transfer data from/to the device data register.
3387 * Inherited from caller.
3390 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3391 unsigned int buflen, int do_write)
3393 /* Make the crap hardware pay the costs not the good stuff */
3394 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3395 unsigned long flags;
3396 local_irq_save(flags);
3397 if (ap->flags & ATA_FLAG_MMIO)
3398 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3400 ata_pio_data_xfer(ap, buf, buflen, do_write);
3401 local_irq_restore(flags);
3403 if (ap->flags & ATA_FLAG_MMIO)
3404 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3406 ata_pio_data_xfer(ap, buf, buflen, do_write);
3411 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3412 * @qc: Command on going
3414 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3417 * Inherited from caller.
3420 static void ata_pio_sector(struct ata_queued_cmd *qc)
3422 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3423 struct scatterlist *sg = qc->__sg;
3424 struct ata_port *ap = qc->ap;
3426 unsigned int offset;
3429 if (qc->cursect == (qc->nsect - 1))
3430 ap->hsm_task_state = HSM_ST_LAST;
3432 page = sg[qc->cursg].page;
3433 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3435 /* get the current page and offset */
3436 page = nth_page(page, (offset >> PAGE_SHIFT));
3437 offset %= PAGE_SIZE;
3439 buf = kmap(page) + offset;
3444 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3449 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3451 /* do the actual data transfer */
3452 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3453 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3459 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3460 * @qc: Command on going
3461 * @bytes: number of bytes
3463 * Transfer Transfer data from/to the ATAPI device.
3466 * Inherited from caller.
3470 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3472 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3473 struct scatterlist *sg = qc->__sg;
3474 struct ata_port *ap = qc->ap;
3477 unsigned int offset, count;
3479 if (qc->curbytes + bytes >= qc->nbytes)
3480 ap->hsm_task_state = HSM_ST_LAST;
3483 if (unlikely(qc->cursg >= qc->n_elem)) {
3485 * The end of qc->sg is reached and the device expects
3486 * more data to transfer. In order not to overrun qc->sg
3487 * and fulfill length specified in the byte count register,
3488 * - for read case, discard trailing data from the device
3489 * - for write case, padding zero data to the device
3491 u16 pad_buf[1] = { 0 };
3492 unsigned int words = bytes >> 1;
3495 if (words) /* warning if bytes > 1 */
3496 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3499 for (i = 0; i < words; i++)
3500 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3502 ap->hsm_task_state = HSM_ST_LAST;
3506 sg = &qc->__sg[qc->cursg];
3509 offset = sg->offset + qc->cursg_ofs;
3511 /* get the current page and offset */
3512 page = nth_page(page, (offset >> PAGE_SHIFT));
3513 offset %= PAGE_SIZE;
3515 /* don't overrun current sg */
3516 count = min(sg->length - qc->cursg_ofs, bytes);
3518 /* don't cross page boundaries */
3519 count = min(count, (unsigned int)PAGE_SIZE - offset);
3521 buf = kmap(page) + offset;
3524 qc->curbytes += count;
3525 qc->cursg_ofs += count;
3527 if (qc->cursg_ofs == sg->length) {
3532 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3534 /* do the actual data transfer */
3535 ata_data_xfer(ap, buf, count, do_write);
3544 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3545 * @qc: Command on going
3547 * Transfer Transfer data from/to the ATAPI device.
3550 * Inherited from caller.
3553 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3555 struct ata_port *ap = qc->ap;
3556 struct ata_device *dev = qc->dev;
3557 unsigned int ireason, bc_lo, bc_hi, bytes;
3558 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3560 ap->ops->tf_read(ap, &qc->tf);
3561 ireason = qc->tf.nsect;
3562 bc_lo = qc->tf.lbam;
3563 bc_hi = qc->tf.lbah;
3564 bytes = (bc_hi << 8) | bc_lo;
3566 /* shall be cleared to zero, indicating xfer of data */
3567 if (ireason & (1 << 0))
3570 /* make sure transfer direction matches expected */
3571 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3572 if (do_write != i_write)
3575 __atapi_pio_bytes(qc, bytes);
3580 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3581 ap->id, dev->devno);
3582 qc->err_mask |= AC_ERR_HSM;
3583 ap->hsm_task_state = HSM_ST_ERR;
3587 * ata_pio_block - start PIO on a block
3588 * @ap: the target ata_port
3591 * None. (executing in kernel thread context)
3594 static void ata_pio_block(struct ata_port *ap)
3596 struct ata_queued_cmd *qc;
3600 * This is purely heuristic. This is a fast path.
3601 * Sometimes when we enter, BSY will be cleared in
3602 * a chk-status or two. If not, the drive is probably seeking
3603 * or something. Snooze for a couple msecs, then
3604 * chk-status again. If still busy, fall back to
3605 * HSM_ST_POLL state.
3607 status = ata_busy_wait(ap, ATA_BUSY, 5);
3608 if (status & ATA_BUSY) {
3610 status = ata_busy_wait(ap, ATA_BUSY, 10);
3611 if (status & ATA_BUSY) {
3612 ap->hsm_task_state = HSM_ST_POLL;
3613 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3618 qc = ata_qc_from_tag(ap, ap->active_tag);
3619 WARN_ON(qc == NULL);
3622 if (status & (ATA_ERR | ATA_DF)) {
3623 qc->err_mask |= AC_ERR_DEV;
3624 ap->hsm_task_state = HSM_ST_ERR;
3628 /* transfer data if any */
3629 if (is_atapi_taskfile(&qc->tf)) {
3630 /* DRQ=0 means no more data to transfer */
3631 if ((status & ATA_DRQ) == 0) {
3632 ap->hsm_task_state = HSM_ST_LAST;
3636 atapi_pio_bytes(qc);
3638 /* handle BSY=0, DRQ=0 as error */
3639 if ((status & ATA_DRQ) == 0) {
3640 qc->err_mask |= AC_ERR_HSM;
3641 ap->hsm_task_state = HSM_ST_ERR;
3649 static void ata_pio_error(struct ata_port *ap)
3651 struct ata_queued_cmd *qc;
3653 qc = ata_qc_from_tag(ap, ap->active_tag);
3654 WARN_ON(qc == NULL);
3656 if (qc->tf.command != ATA_CMD_PACKET)
3657 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3659 /* make sure qc->err_mask is available to
3660 * know what's wrong and recover
3662 WARN_ON(qc->err_mask == 0);
3664 ap->hsm_task_state = HSM_ST_IDLE;
3666 ata_poll_qc_complete(qc);
3669 static void ata_pio_task(void *_data)
3671 struct ata_port *ap = _data;
3672 unsigned long timeout;
3679 switch (ap->hsm_task_state) {
3688 qc_completed = ata_pio_complete(ap);
3692 case HSM_ST_LAST_POLL:
3693 timeout = ata_pio_poll(ap);
3703 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3704 else if (!qc_completed)
3709 * atapi_packet_task - Write CDB bytes to hardware
3710 * @_data: Port to which ATAPI device is attached.
3712 * When device has indicated its readiness to accept
3713 * a CDB, this function is called. Send the CDB.
3714 * If DMA is to be performed, exit immediately.
3715 * Otherwise, we are in polling mode, so poll
3716 * status under operation succeeds or fails.
3719 * Kernel thread context (may sleep)
3722 static void atapi_packet_task(void *_data)
3724 struct ata_port *ap = _data;
3725 struct ata_queued_cmd *qc;
3728 qc = ata_qc_from_tag(ap, ap->active_tag);
3729 WARN_ON(qc == NULL);
3730 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3732 /* sleep-wait for BSY to clear */
3733 DPRINTK("busy wait\n");
3734 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3735 qc->err_mask |= AC_ERR_TIMEOUT;
3739 /* make sure DRQ is set */
3740 status = ata_chk_status(ap);
3741 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3742 qc->err_mask |= AC_ERR_HSM;
3747 DPRINTK("send cdb\n");
3748 WARN_ON(qc->dev->cdb_len < 12);
3750 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3751 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3752 unsigned long flags;
3754 /* Once we're done issuing command and kicking bmdma,
3755 * irq handler takes over. To not lose irq, we need
3756 * to clear NOINTR flag before sending cdb, but
3757 * interrupt handler shouldn't be invoked before we're
3758 * finished. Hence, the following locking.
3760 spin_lock_irqsave(&ap->host_set->lock, flags);
3761 ap->flags &= ~ATA_FLAG_NOINTR;
3762 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3763 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3764 ap->ops->bmdma_start(qc); /* initiate bmdma */
3765 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3767 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3769 /* PIO commands are handled by polling */
3770 ap->hsm_task_state = HSM_ST;
3771 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3777 ata_poll_qc_complete(qc);
3781 * ata_qc_timeout - Handle timeout of queued command
3782 * @qc: Command that timed out
3784 * Some part of the kernel (currently, only the SCSI layer)
3785 * has noticed that the active command on port @ap has not
3786 * completed after a specified length of time. Handle this
3787 * condition by disabling DMA (if necessary) and completing
3788 * transactions, with error if necessary.
3790 * This also handles the case of the "lost interrupt", where
3791 * for some reason (possibly hardware bug, possibly driver bug)
3792 * an interrupt was not delivered to the driver, even though the
3793 * transaction completed successfully.
3796 * Inherited from SCSI layer (none, can sleep)
3799 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3801 struct ata_port *ap = qc->ap;
3802 struct ata_host_set *host_set = ap->host_set;
3803 u8 host_stat = 0, drv_stat;
3804 unsigned long flags;
3808 ap->hsm_task_state = HSM_ST_IDLE;
3810 spin_lock_irqsave(&host_set->lock, flags);
3812 switch (qc->tf.protocol) {
3815 case ATA_PROT_ATAPI_DMA:
3816 host_stat = ap->ops->bmdma_status(ap);
3818 /* before we do anything else, clear DMA-Start bit */
3819 ap->ops->bmdma_stop(qc);
3825 drv_stat = ata_chk_status(ap);
3827 /* ack bmdma irq events */
3828 ap->ops->irq_clear(ap);
3830 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3831 ap->id, qc->tf.command, drv_stat, host_stat);
3833 /* complete taskfile transaction */
3834 qc->err_mask |= ac_err_mask(drv_stat);
3838 spin_unlock_irqrestore(&host_set->lock, flags);
3840 ata_eh_qc_complete(qc);
3846 * ata_eng_timeout - Handle timeout of queued command
3847 * @ap: Port on which timed-out command is active
3849 * Some part of the kernel (currently, only the SCSI layer)
3850 * has noticed that the active command on port @ap has not
3851 * completed after a specified length of time. Handle this
3852 * condition by disabling DMA (if necessary) and completing
3853 * transactions, with error if necessary.
3855 * This also handles the case of the "lost interrupt", where
3856 * for some reason (possibly hardware bug, possibly driver bug)
3857 * an interrupt was not delivered to the driver, even though the
3858 * transaction completed successfully.
3861 * Inherited from SCSI layer (none, can sleep)
3864 void ata_eng_timeout(struct ata_port *ap)
3868 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3874 * ata_qc_new - Request an available ATA command, for queueing
3875 * @ap: Port associated with device @dev
3876 * @dev: Device from whom we request an available command structure
3882 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3884 struct ata_queued_cmd *qc = NULL;
3887 for (i = 0; i < ATA_MAX_QUEUE; i++)
3888 if (!test_and_set_bit(i, &ap->qactive)) {
3889 qc = ata_qc_from_tag(ap, i);
3900 * ata_qc_new_init - Request an available ATA command, and initialize it
3901 * @ap: Port associated with device @dev
3902 * @dev: Device from whom we request an available command structure
3908 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3909 struct ata_device *dev)
3911 struct ata_queued_cmd *qc;
3913 qc = ata_qc_new(ap);
3926 * ata_qc_free - free unused ata_queued_cmd
3927 * @qc: Command to complete
3929 * Designed to free unused ata_queued_cmd object
3930 * in case something prevents using it.
3933 * spin_lock_irqsave(host_set lock)
3935 void ata_qc_free(struct ata_queued_cmd *qc)
3937 struct ata_port *ap = qc->ap;
3940 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3944 if (likely(ata_tag_valid(tag))) {
3945 if (tag == ap->active_tag)
3946 ap->active_tag = ATA_TAG_POISON;
3947 qc->tag = ATA_TAG_POISON;
3948 clear_bit(tag, &ap->qactive);
3952 void __ata_qc_complete(struct ata_queued_cmd *qc)
3954 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3955 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3957 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3960 /* atapi: mark qc as inactive to prevent the interrupt handler
3961 * from completing the command twice later, before the error handler
3962 * is called. (when rc != 0 and atapi request sense is needed)
3964 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3966 /* call completion callback */
3967 qc->complete_fn(qc);
3970 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3972 struct ata_port *ap = qc->ap;
3974 switch (qc->tf.protocol) {
3976 case ATA_PROT_ATAPI_DMA:
3979 case ATA_PROT_ATAPI:
3981 if (ap->flags & ATA_FLAG_PIO_DMA)
3994 * ata_qc_issue - issue taskfile to device
3995 * @qc: command to issue to device
3997 * Prepare an ATA command to submission to device.
3998 * This includes mapping the data into a DMA-able
3999 * area, filling in the S/G table, and finally
4000 * writing the taskfile to hardware, starting the command.
4003 * spin_lock_irqsave(host_set lock)
4005 void ata_qc_issue(struct ata_queued_cmd *qc)
4007 struct ata_port *ap = qc->ap;
4009 qc->ap->active_tag = qc->tag;
4010 qc->flags |= ATA_QCFLAG_ACTIVE;
4012 if (ata_should_dma_map(qc)) {
4013 if (qc->flags & ATA_QCFLAG_SG) {
4014 if (ata_sg_setup(qc))
4016 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4017 if (ata_sg_setup_one(qc))
4021 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4024 ap->ops->qc_prep(qc);
4026 qc->err_mask |= ap->ops->qc_issue(qc);
4027 if (unlikely(qc->err_mask))
4032 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4033 qc->err_mask |= AC_ERR_SYSTEM;
4035 ata_qc_complete(qc);
4039 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4040 * @qc: command to issue to device
4042 * Using various libata functions and hooks, this function
4043 * starts an ATA command. ATA commands are grouped into
4044 * classes called "protocols", and issuing each type of protocol
4045 * is slightly different.
4047 * May be used as the qc_issue() entry in ata_port_operations.
4050 * spin_lock_irqsave(host_set lock)
4053 * Zero on success, AC_ERR_* mask on failure
4056 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4058 struct ata_port *ap = qc->ap;
4060 ata_dev_select(ap, qc->dev->devno, 1, 0);
4062 switch (qc->tf.protocol) {
4063 case ATA_PROT_NODATA:
4064 ata_tf_to_host(ap, &qc->tf);
4068 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4069 ap->ops->bmdma_setup(qc); /* set up bmdma */
4070 ap->ops->bmdma_start(qc); /* initiate bmdma */
4073 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4074 ata_qc_set_polling(qc);
4075 ata_tf_to_host(ap, &qc->tf);
4076 ap->hsm_task_state = HSM_ST;
4077 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4080 case ATA_PROT_ATAPI:
4081 ata_qc_set_polling(qc);
4082 ata_tf_to_host(ap, &qc->tf);
4083 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4086 case ATA_PROT_ATAPI_NODATA:
4087 ap->flags |= ATA_FLAG_NOINTR;
4088 ata_tf_to_host(ap, &qc->tf);
4089 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4092 case ATA_PROT_ATAPI_DMA:
4093 ap->flags |= ATA_FLAG_NOINTR;
4094 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4095 ap->ops->bmdma_setup(qc); /* set up bmdma */
4096 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4101 return AC_ERR_SYSTEM;
4108 * ata_host_intr - Handle host interrupt for given (port, task)
4109 * @ap: Port on which interrupt arrived (possibly...)
4110 * @qc: Taskfile currently active in engine
4112 * Handle host interrupt for given queued command. Currently,
4113 * only DMA interrupts are handled. All other commands are
4114 * handled via polling with interrupts disabled (nIEN bit).
4117 * spin_lock_irqsave(host_set lock)
4120 * One if interrupt was handled, zero if not (shared irq).
4123 inline unsigned int ata_host_intr (struct ata_port *ap,
4124 struct ata_queued_cmd *qc)
4126 u8 status, host_stat;
4128 switch (qc->tf.protocol) {
4131 case ATA_PROT_ATAPI_DMA:
4132 case ATA_PROT_ATAPI:
4133 /* check status of DMA engine */
4134 host_stat = ap->ops->bmdma_status(ap);
4135 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4137 /* if it's not our irq... */
4138 if (!(host_stat & ATA_DMA_INTR))
4141 /* before we do anything else, clear DMA-Start bit */
4142 ap->ops->bmdma_stop(qc);
4146 case ATA_PROT_ATAPI_NODATA:
4147 case ATA_PROT_NODATA:
4148 /* check altstatus */
4149 status = ata_altstatus(ap);
4150 if (status & ATA_BUSY)
4153 /* check main status, clearing INTRQ */
4154 status = ata_chk_status(ap);
4155 if (unlikely(status & ATA_BUSY))
4157 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4158 ap->id, qc->tf.protocol, status);
4160 /* ack bmdma irq events */
4161 ap->ops->irq_clear(ap);
4163 /* complete taskfile transaction */
4164 qc->err_mask |= ac_err_mask(status);
4165 ata_qc_complete(qc);
4172 return 1; /* irq handled */
4175 ap->stats.idle_irq++;
4178 if ((ap->stats.idle_irq % 1000) == 0) {
4179 ata_irq_ack(ap, 0); /* debug trap */
4180 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4184 return 0; /* irq not handled */
4188 * ata_interrupt - Default ATA host interrupt handler
4189 * @irq: irq line (unused)
4190 * @dev_instance: pointer to our ata_host_set information structure
4193 * Default interrupt handler for PCI IDE devices. Calls
4194 * ata_host_intr() for each port that is not disabled.
4197 * Obtains host_set lock during operation.
4200 * IRQ_NONE or IRQ_HANDLED.
4203 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4205 struct ata_host_set *host_set = dev_instance;
4207 unsigned int handled = 0;
4208 unsigned long flags;
4210 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4211 spin_lock_irqsave(&host_set->lock, flags);
4213 for (i = 0; i < host_set->n_ports; i++) {
4214 struct ata_port *ap;
4216 ap = host_set->ports[i];
4218 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4219 struct ata_queued_cmd *qc;
4221 qc = ata_qc_from_tag(ap, ap->active_tag);
4222 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4223 (qc->flags & ATA_QCFLAG_ACTIVE))
4224 handled |= ata_host_intr(ap, qc);
4228 spin_unlock_irqrestore(&host_set->lock, flags);
4230 return IRQ_RETVAL(handled);
4235 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4236 * without filling any other registers
4238 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4241 struct ata_taskfile tf;
4244 ata_tf_init(ap, &tf, dev->devno);
4247 tf.flags |= ATA_TFLAG_DEVICE;
4248 tf.protocol = ATA_PROT_NODATA;
4250 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4252 printk(KERN_ERR "%s: ata command failed: %d\n",
4258 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4262 if (!ata_try_flush_cache(dev))
4265 if (ata_id_has_flush_ext(dev->id))
4266 cmd = ATA_CMD_FLUSH_EXT;
4268 cmd = ATA_CMD_FLUSH;
4270 return ata_do_simple_cmd(ap, dev, cmd);
4273 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4275 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4278 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4280 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4284 * ata_device_resume - wakeup a previously suspended devices
4285 * @ap: port the device is connected to
4286 * @dev: the device to resume
4288 * Kick the drive back into action, by sending it an idle immediate
4289 * command and making sure its transfer mode matches between drive
4293 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4295 if (ap->flags & ATA_FLAG_SUSPENDED) {
4296 ap->flags &= ~ATA_FLAG_SUSPENDED;
4299 if (!ata_dev_present(dev))
4301 if (dev->class == ATA_DEV_ATA)
4302 ata_start_drive(ap, dev);
4308 * ata_device_suspend - prepare a device for suspend
4309 * @ap: port the device is connected to
4310 * @dev: the device to suspend
4312 * Flush the cache on the drive, if appropriate, then issue a
4313 * standbynow command.
4315 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4317 if (!ata_dev_present(dev))
4319 if (dev->class == ATA_DEV_ATA)
4320 ata_flush_cache(ap, dev);
4322 if (state.event != PM_EVENT_FREEZE)
4323 ata_standby_drive(ap, dev);
4324 ap->flags |= ATA_FLAG_SUSPENDED;
4329 * ata_port_start - Set port up for dma.
4330 * @ap: Port to initialize
4332 * Called just after data structures for each port are
4333 * initialized. Allocates space for PRD table.
4335 * May be used as the port_start() entry in ata_port_operations.
4338 * Inherited from caller.
4341 int ata_port_start (struct ata_port *ap)
4343 struct device *dev = ap->dev;
4346 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4350 rc = ata_pad_alloc(ap, dev);
4352 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4356 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4363 * ata_port_stop - Undo ata_port_start()
4364 * @ap: Port to shut down
4366 * Frees the PRD table.
4368 * May be used as the port_stop() entry in ata_port_operations.
4371 * Inherited from caller.
4374 void ata_port_stop (struct ata_port *ap)
4376 struct device *dev = ap->dev;
4378 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4379 ata_pad_free(ap, dev);
4382 void ata_host_stop (struct ata_host_set *host_set)
4384 if (host_set->mmio_base)
4385 iounmap(host_set->mmio_base);
4390 * ata_host_remove - Unregister SCSI host structure with upper layers
4391 * @ap: Port to unregister
4392 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4395 * Inherited from caller.
4398 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4400 struct Scsi_Host *sh = ap->host;
4405 scsi_remove_host(sh);
4407 ap->ops->port_stop(ap);
4411 * ata_host_init - Initialize an ata_port structure
4412 * @ap: Structure to initialize
4413 * @host: associated SCSI mid-layer structure
4414 * @host_set: Collection of hosts to which @ap belongs
4415 * @ent: Probe information provided by low-level driver
4416 * @port_no: Port number associated with this ata_port
4418 * Initialize a new ata_port structure, and its associated
4422 * Inherited from caller.
4425 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4426 struct ata_host_set *host_set,
4427 const struct ata_probe_ent *ent, unsigned int port_no)
4433 host->max_channel = 1;
4434 host->unique_id = ata_unique_id++;
4435 host->max_cmd_len = 12;
4437 ap->flags = ATA_FLAG_PORT_DISABLED;
4438 ap->id = host->unique_id;
4440 ap->ctl = ATA_DEVCTL_OBS;
4441 ap->host_set = host_set;
4443 ap->port_no = port_no;
4445 ent->legacy_mode ? ent->hard_port_no : port_no;
4446 ap->pio_mask = ent->pio_mask;
4447 ap->mwdma_mask = ent->mwdma_mask;
4448 ap->udma_mask = ent->udma_mask;
4449 ap->flags |= ent->host_flags;
4450 ap->ops = ent->port_ops;
4451 ap->cbl = ATA_CBL_NONE;
4452 ap->active_tag = ATA_TAG_POISON;
4453 ap->last_ctl = 0xFF;
4455 INIT_WORK(&ap->port_task, NULL, NULL);
4456 INIT_LIST_HEAD(&ap->eh_done_q);
4458 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4459 struct ata_device *dev = &ap->device[i];
4461 dev->pio_mask = UINT_MAX;
4462 dev->mwdma_mask = UINT_MAX;
4463 dev->udma_mask = UINT_MAX;
4467 ap->stats.unhandled_irq = 1;
4468 ap->stats.idle_irq = 1;
4471 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4475 * ata_host_add - Attach low-level ATA driver to system
4476 * @ent: Information provided by low-level driver
4477 * @host_set: Collections of ports to which we add
4478 * @port_no: Port number associated with this host
4480 * Attach low-level ATA driver to system.
4483 * PCI/etc. bus probe sem.
4486 * New ata_port on success, for NULL on error.
4489 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4490 struct ata_host_set *host_set,
4491 unsigned int port_no)
4493 struct Scsi_Host *host;
4494 struct ata_port *ap;
4499 if (!ent->port_ops->probe_reset &&
4500 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4501 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4506 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4510 host->transportt = &ata_scsi_transport_template;
4512 ap = (struct ata_port *) &host->hostdata[0];
4514 ata_host_init(ap, host, host_set, ent, port_no);
4516 rc = ap->ops->port_start(ap);
4523 scsi_host_put(host);
4528 * ata_device_add - Register hardware device with ATA and SCSI layers
4529 * @ent: Probe information describing hardware device to be registered
4531 * This function processes the information provided in the probe
4532 * information struct @ent, allocates the necessary ATA and SCSI
4533 * host information structures, initializes them, and registers
4534 * everything with requisite kernel subsystems.
4536 * This function requests irqs, probes the ATA bus, and probes
4540 * PCI/etc. bus probe sem.
4543 * Number of ports registered. Zero on error (no ports registered).
4546 int ata_device_add(const struct ata_probe_ent *ent)
4548 unsigned int count = 0, i;
4549 struct device *dev = ent->dev;
4550 struct ata_host_set *host_set;
4553 /* alloc a container for our list of ATA ports (buses) */
4554 host_set = kzalloc(sizeof(struct ata_host_set) +
4555 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4558 spin_lock_init(&host_set->lock);
4560 host_set->dev = dev;
4561 host_set->n_ports = ent->n_ports;
4562 host_set->irq = ent->irq;
4563 host_set->mmio_base = ent->mmio_base;
4564 host_set->private_data = ent->private_data;
4565 host_set->ops = ent->port_ops;
4566 host_set->flags = ent->host_set_flags;
4568 /* register each port bound to this device */
4569 for (i = 0; i < ent->n_ports; i++) {
4570 struct ata_port *ap;
4571 unsigned long xfer_mode_mask;
4573 ap = ata_host_add(ent, host_set, i);
4577 host_set->ports[i] = ap;
4578 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4579 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4580 (ap->pio_mask << ATA_SHIFT_PIO);
4582 /* print per-port info to dmesg */
4583 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4584 "bmdma 0x%lX irq %lu\n",
4586 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4587 ata_mode_string(xfer_mode_mask),
4588 ap->ioaddr.cmd_addr,
4589 ap->ioaddr.ctl_addr,
4590 ap->ioaddr.bmdma_addr,
4594 host_set->ops->irq_clear(ap);
4601 /* obtain irq, that is shared between channels */
4602 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4603 DRV_NAME, host_set))
4606 /* perform each probe synchronously */
4607 DPRINTK("probe begin\n");
4608 for (i = 0; i < count; i++) {
4609 struct ata_port *ap;
4612 ap = host_set->ports[i];
4614 DPRINTK("ata%u: bus probe begin\n", ap->id);
4615 rc = ata_bus_probe(ap);
4616 DPRINTK("ata%u: bus probe end\n", ap->id);
4619 /* FIXME: do something useful here?
4620 * Current libata behavior will
4621 * tear down everything when
4622 * the module is removed
4623 * or the h/w is unplugged.
4627 rc = scsi_add_host(ap->host, dev);
4629 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4631 /* FIXME: do something useful here */
4632 /* FIXME: handle unconditional calls to
4633 * scsi_scan_host and ata_host_remove, below,
4639 /* probes are done, now scan each port's disk(s) */
4640 DPRINTK("host probe begin\n");
4641 for (i = 0; i < count; i++) {
4642 struct ata_port *ap = host_set->ports[i];
4644 ata_scsi_scan_host(ap);
4647 dev_set_drvdata(dev, host_set);
4649 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4650 return ent->n_ports; /* success */
4653 for (i = 0; i < count; i++) {
4654 ata_host_remove(host_set->ports[i], 1);
4655 scsi_host_put(host_set->ports[i]->host);
4659 VPRINTK("EXIT, returning 0\n");
4664 * ata_host_set_remove - PCI layer callback for device removal
4665 * @host_set: ATA host set that was removed
4667 * Unregister all objects associated with this host set. Free those
4671 * Inherited from calling layer (may sleep).
4674 void ata_host_set_remove(struct ata_host_set *host_set)
4676 struct ata_port *ap;
4679 for (i = 0; i < host_set->n_ports; i++) {
4680 ap = host_set->ports[i];
4681 scsi_remove_host(ap->host);
4684 free_irq(host_set->irq, host_set);
4686 for (i = 0; i < host_set->n_ports; i++) {
4687 ap = host_set->ports[i];
4689 ata_scsi_release(ap->host);
4691 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4692 struct ata_ioports *ioaddr = &ap->ioaddr;
4694 if (ioaddr->cmd_addr == 0x1f0)
4695 release_region(0x1f0, 8);
4696 else if (ioaddr->cmd_addr == 0x170)
4697 release_region(0x170, 8);
4700 scsi_host_put(ap->host);
4703 if (host_set->ops->host_stop)
4704 host_set->ops->host_stop(host_set);
4710 * ata_scsi_release - SCSI layer callback hook for host unload
4711 * @host: libata host to be unloaded
4713 * Performs all duties necessary to shut down a libata port...
4714 * Kill port kthread, disable port, and release resources.
4717 * Inherited from SCSI layer.
4723 int ata_scsi_release(struct Scsi_Host *host)
4725 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4730 ap->ops->port_disable(ap);
4731 ata_host_remove(ap, 0);
4732 for (i = 0; i < ATA_MAX_DEVICES; i++)
4733 kfree(ap->device[i].id);
4740 * ata_std_ports - initialize ioaddr with standard port offsets.
4741 * @ioaddr: IO address structure to be initialized
4743 * Utility function which initializes data_addr, error_addr,
4744 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4745 * device_addr, status_addr, and command_addr to standard offsets
4746 * relative to cmd_addr.
4748 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4751 void ata_std_ports(struct ata_ioports *ioaddr)
4753 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4754 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4755 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4756 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4757 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4758 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4759 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4760 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4761 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4762 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4768 void ata_pci_host_stop (struct ata_host_set *host_set)
4770 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4772 pci_iounmap(pdev, host_set->mmio_base);
4776 * ata_pci_remove_one - PCI layer callback for device removal
4777 * @pdev: PCI device that was removed
4779 * PCI layer indicates to libata via this hook that
4780 * hot-unplug or module unload event has occurred.
4781 * Handle this by unregistering all objects associated
4782 * with this PCI device. Free those objects. Then finally
4783 * release PCI resources and disable device.
4786 * Inherited from PCI layer (may sleep).
4789 void ata_pci_remove_one (struct pci_dev *pdev)
4791 struct device *dev = pci_dev_to_dev(pdev);
4792 struct ata_host_set *host_set = dev_get_drvdata(dev);
4794 ata_host_set_remove(host_set);
4795 pci_release_regions(pdev);
4796 pci_disable_device(pdev);
4797 dev_set_drvdata(dev, NULL);
4800 /* move to PCI subsystem */
4801 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4803 unsigned long tmp = 0;
4805 switch (bits->width) {
4808 pci_read_config_byte(pdev, bits->reg, &tmp8);
4814 pci_read_config_word(pdev, bits->reg, &tmp16);
4820 pci_read_config_dword(pdev, bits->reg, &tmp32);
4831 return (tmp == bits->val) ? 1 : 0;
4834 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4836 pci_save_state(pdev);
4837 pci_disable_device(pdev);
4838 pci_set_power_state(pdev, PCI_D3hot);
4842 int ata_pci_device_resume(struct pci_dev *pdev)
4844 pci_set_power_state(pdev, PCI_D0);
4845 pci_restore_state(pdev);
4846 pci_enable_device(pdev);
4847 pci_set_master(pdev);
4850 #endif /* CONFIG_PCI */
4853 static int __init ata_init(void)
4855 ata_wq = create_workqueue("ata");
4859 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4863 static void __exit ata_exit(void)
4865 destroy_workqueue(ata_wq);
4868 module_init(ata_init);
4869 module_exit(ata_exit);
4871 static unsigned long ratelimit_time;
4872 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4874 int ata_ratelimit(void)
4877 unsigned long flags;
4879 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4881 if (time_after(jiffies, ratelimit_time)) {
4883 ratelimit_time = jiffies + (HZ/5);
4887 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4893 * libata is essentially a library of internal helper functions for
4894 * low-level ATA host controller drivers. As such, the API/ABI is
4895 * likely to change as new drivers are added and updated.
4896 * Do not depend on ABI/API stability.
4899 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4900 EXPORT_SYMBOL_GPL(ata_std_ports);
4901 EXPORT_SYMBOL_GPL(ata_device_add);
4902 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4903 EXPORT_SYMBOL_GPL(ata_sg_init);
4904 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4905 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4906 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4907 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4908 EXPORT_SYMBOL_GPL(ata_tf_load);
4909 EXPORT_SYMBOL_GPL(ata_tf_read);
4910 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4911 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4912 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4913 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4914 EXPORT_SYMBOL_GPL(ata_check_status);
4915 EXPORT_SYMBOL_GPL(ata_altstatus);
4916 EXPORT_SYMBOL_GPL(ata_exec_command);
4917 EXPORT_SYMBOL_GPL(ata_port_start);
4918 EXPORT_SYMBOL_GPL(ata_port_stop);
4919 EXPORT_SYMBOL_GPL(ata_host_stop);
4920 EXPORT_SYMBOL_GPL(ata_interrupt);
4921 EXPORT_SYMBOL_GPL(ata_qc_prep);
4922 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4923 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4924 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4925 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4926 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4927 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4928 EXPORT_SYMBOL_GPL(ata_port_probe);
4929 EXPORT_SYMBOL_GPL(sata_phy_reset);
4930 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4931 EXPORT_SYMBOL_GPL(ata_bus_reset);
4932 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4933 EXPORT_SYMBOL_GPL(ata_std_softreset);
4934 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4935 EXPORT_SYMBOL_GPL(ata_std_postreset);
4936 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4937 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4938 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4939 EXPORT_SYMBOL_GPL(ata_dev_classify);
4940 EXPORT_SYMBOL_GPL(ata_dev_pair);
4941 EXPORT_SYMBOL_GPL(ata_port_disable);
4942 EXPORT_SYMBOL_GPL(ata_ratelimit);
4943 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4944 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4945 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4946 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4947 EXPORT_SYMBOL_GPL(ata_scsi_error);
4948 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4949 EXPORT_SYMBOL_GPL(ata_scsi_release);
4950 EXPORT_SYMBOL_GPL(ata_host_intr);
4951 EXPORT_SYMBOL_GPL(ata_id_string);
4952 EXPORT_SYMBOL_GPL(ata_id_c_string);
4953 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4954 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4955 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4957 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4958 EXPORT_SYMBOL_GPL(ata_timing_compute);
4959 EXPORT_SYMBOL_GPL(ata_timing_merge);
4962 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4963 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4964 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4965 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4966 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4967 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4968 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4969 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4970 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4971 #endif /* CONFIG_PCI */
4973 EXPORT_SYMBOL_GPL(ata_device_suspend);
4974 EXPORT_SYMBOL_GPL(ata_device_resume);
4975 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4976 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);