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 ata_do_reset(struct ata_port *ap,
2375 ata_reset_fn_t reset, ata_postreset_fn_t postreset,
2376 int verbose, unsigned int *classes)
2380 for (i = 0; i < ATA_MAX_DEVICES; i++)
2381 classes[i] = ATA_DEV_UNKNOWN;
2383 rc = reset(ap, verbose, 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);
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 = ata_do_reset(ap, softreset, postreset, 0, classes);
2449 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2456 rc = ata_do_reset(ap, hardreset, postreset, 0, classes);
2457 if (rc || classes[0] != ATA_DEV_UNKNOWN)
2461 rc = ata_do_reset(ap, softreset, postreset, 0, classes);
2464 if (rc == 0 && classes[0] == ATA_DEV_UNKNOWN)
2470 * ata_dev_same_device - Determine whether new ID matches configured device
2471 * @ap: port on which the device to compare against resides
2472 * @dev: device to compare against
2473 * @new_class: class of the new device
2474 * @new_id: IDENTIFY page of the new device
2476 * Compare @new_class and @new_id against @dev and determine
2477 * whether @dev is the device indicated by @new_class and
2484 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2486 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2487 unsigned int new_class, const u16 *new_id)
2489 const u16 *old_id = dev->id;
2490 unsigned char model[2][41], serial[2][21];
2493 if (dev->class != new_class) {
2495 "ata%u: dev %u class mismatch %d != %d\n",
2496 ap->id, dev->devno, dev->class, new_class);
2500 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2501 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2502 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2503 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2504 new_n_sectors = ata_id_n_sectors(new_id);
2506 if (strcmp(model[0], model[1])) {
2508 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2509 ap->id, dev->devno, model[0], model[1]);
2513 if (strcmp(serial[0], serial[1])) {
2515 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2516 ap->id, dev->devno, serial[0], serial[1]);
2520 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2522 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2523 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2524 (unsigned long long)new_n_sectors);
2532 * ata_dev_revalidate - Revalidate ATA device
2533 * @ap: port on which the device to revalidate resides
2534 * @dev: device to revalidate
2535 * @post_reset: is this revalidation after reset?
2537 * Re-read IDENTIFY page and make sure @dev is still attached to
2541 * Kernel thread context (may sleep)
2544 * 0 on success, negative errno otherwise
2546 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2553 if (!ata_dev_present(dev))
2559 /* allocate & read ID data */
2560 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2564 /* is the device still there? */
2565 if (!ata_dev_same_device(ap, dev, class, id)) {
2573 /* configure device according to the new ID */
2574 return ata_dev_configure(ap, dev, 0);
2577 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2578 ap->id, dev->devno, rc);
2583 static const char * const ata_dma_blacklist [] = {
2584 "WDC AC11000H", NULL,
2585 "WDC AC22100H", NULL,
2586 "WDC AC32500H", NULL,
2587 "WDC AC33100H", NULL,
2588 "WDC AC31600H", NULL,
2589 "WDC AC32100H", "24.09P07",
2590 "WDC AC23200L", "21.10N21",
2591 "Compaq CRD-8241B", NULL,
2596 "SanDisk SDP3B", NULL,
2597 "SanDisk SDP3B-64", NULL,
2598 "SANYO CD-ROM CRD", NULL,
2599 "HITACHI CDR-8", NULL,
2600 "HITACHI CDR-8335", NULL,
2601 "HITACHI CDR-8435", NULL,
2602 "Toshiba CD-ROM XM-6202B", NULL,
2603 "TOSHIBA CD-ROM XM-1702BC", NULL,
2605 "E-IDE CD-ROM CR-840", NULL,
2606 "CD-ROM Drive/F5A", NULL,
2607 "WPI CDD-820", NULL,
2608 "SAMSUNG CD-ROM SC-148C", NULL,
2609 "SAMSUNG CD-ROM SC", NULL,
2610 "SanDisk SDP3B-64", NULL,
2611 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2612 "_NEC DV5800A", NULL,
2613 "SAMSUNG CD-ROM SN-124", "N001"
2616 static int ata_strim(char *s, size_t len)
2618 len = strnlen(s, len);
2620 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2621 while ((len > 0) && (s[len - 1] == ' ')) {
2628 static int ata_dma_blacklisted(const struct ata_device *dev)
2630 unsigned char model_num[40];
2631 unsigned char model_rev[16];
2632 unsigned int nlen, rlen;
2635 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2637 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2639 nlen = ata_strim(model_num, sizeof(model_num));
2640 rlen = ata_strim(model_rev, sizeof(model_rev));
2642 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2643 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2644 if (ata_dma_blacklist[i+1] == NULL)
2646 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2654 * ata_dev_xfermask - Compute supported xfermask of the given device
2655 * @ap: Port on which the device to compute xfermask for resides
2656 * @dev: Device to compute xfermask for
2658 * Compute supported xfermask of @dev and store it in
2659 * dev->*_mask. This function is responsible for applying all
2660 * known limits including host controller limits, device
2663 * FIXME: The current implementation limits all transfer modes to
2664 * the fastest of the lowested device on the port. This is not
2665 * required on most controllers.
2670 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2672 struct ata_host_set *hs = ap->host_set;
2673 unsigned long xfer_mask;
2676 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2679 /* FIXME: Use port-wide xfermask for now */
2680 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2681 struct ata_device *d = &ap->device[i];
2682 if (!ata_dev_present(d))
2684 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2686 xfer_mask &= ata_id_xfermask(d->id);
2687 if (ata_dma_blacklisted(d))
2688 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2689 /* Apply cable rule here. Don't apply it early because when
2690 we handle hot plug the cable type can itself change */
2691 if (ap->cbl == ATA_CBL_PATA40)
2692 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2695 if (ata_dma_blacklisted(dev))
2696 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2697 "disabling DMA\n", ap->id, dev->devno);
2699 if (hs->flags & ATA_HOST_SIMPLEX) {
2700 if (hs->simplex_claimed)
2701 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2703 if (ap->ops->mode_filter)
2704 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2706 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2711 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2712 * @ap: Port associated with device @dev
2713 * @dev: Device to which command will be sent
2715 * Issue SET FEATURES - XFER MODE command to device @dev
2719 * PCI/etc. bus probe sem.
2722 * 0 on success, AC_ERR_* mask otherwise.
2725 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2726 struct ata_device *dev)
2728 struct ata_taskfile tf;
2729 unsigned int err_mask;
2731 /* set up set-features taskfile */
2732 DPRINTK("set features - xfer mode\n");
2734 ata_tf_init(ap, &tf, dev->devno);
2735 tf.command = ATA_CMD_SET_FEATURES;
2736 tf.feature = SETFEATURES_XFER;
2737 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2738 tf.protocol = ATA_PROT_NODATA;
2739 tf.nsect = dev->xfer_mode;
2741 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2743 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2748 * ata_dev_init_params - Issue INIT DEV PARAMS command
2749 * @ap: Port associated with device @dev
2750 * @dev: Device to which command will be sent
2753 * Kernel thread context (may sleep)
2756 * 0 on success, AC_ERR_* mask otherwise.
2759 static unsigned int ata_dev_init_params(struct ata_port *ap,
2760 struct ata_device *dev,
2764 struct ata_taskfile tf;
2765 unsigned int err_mask;
2767 /* Number of sectors per track 1-255. Number of heads 1-16 */
2768 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2769 return AC_ERR_INVALID;
2771 /* set up init dev params taskfile */
2772 DPRINTK("init dev params \n");
2774 ata_tf_init(ap, &tf, dev->devno);
2775 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2776 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2777 tf.protocol = ATA_PROT_NODATA;
2779 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2781 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2783 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2788 * ata_sg_clean - Unmap DMA memory associated with command
2789 * @qc: Command containing DMA memory to be released
2791 * Unmap all mapped DMA memory associated with this command.
2794 * spin_lock_irqsave(host_set lock)
2797 static void ata_sg_clean(struct ata_queued_cmd *qc)
2799 struct ata_port *ap = qc->ap;
2800 struct scatterlist *sg = qc->__sg;
2801 int dir = qc->dma_dir;
2802 void *pad_buf = NULL;
2804 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2805 WARN_ON(sg == NULL);
2807 if (qc->flags & ATA_QCFLAG_SINGLE)
2808 WARN_ON(qc->n_elem > 1);
2810 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2812 /* if we padded the buffer out to 32-bit bound, and data
2813 * xfer direction is from-device, we must copy from the
2814 * pad buffer back into the supplied buffer
2816 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2817 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2819 if (qc->flags & ATA_QCFLAG_SG) {
2821 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
2822 /* restore last sg */
2823 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2825 struct scatterlist *psg = &qc->pad_sgent;
2826 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2827 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2828 kunmap_atomic(addr, KM_IRQ0);
2832 dma_unmap_single(ap->dev,
2833 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2836 sg->length += qc->pad_len;
2838 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2839 pad_buf, qc->pad_len);
2842 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2847 * ata_fill_sg - Fill PCI IDE PRD table
2848 * @qc: Metadata associated with taskfile to be transferred
2850 * Fill PCI IDE PRD (scatter-gather) table with segments
2851 * associated with the current disk command.
2854 * spin_lock_irqsave(host_set lock)
2857 static void ata_fill_sg(struct ata_queued_cmd *qc)
2859 struct ata_port *ap = qc->ap;
2860 struct scatterlist *sg;
2863 WARN_ON(qc->__sg == NULL);
2864 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2867 ata_for_each_sg(sg, qc) {
2871 /* determine if physical DMA addr spans 64K boundary.
2872 * Note h/w doesn't support 64-bit, so we unconditionally
2873 * truncate dma_addr_t to u32.
2875 addr = (u32) sg_dma_address(sg);
2876 sg_len = sg_dma_len(sg);
2879 offset = addr & 0xffff;
2881 if ((offset + sg_len) > 0x10000)
2882 len = 0x10000 - offset;
2884 ap->prd[idx].addr = cpu_to_le32(addr);
2885 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2886 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2895 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2898 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2899 * @qc: Metadata associated with taskfile to check
2901 * Allow low-level driver to filter ATA PACKET commands, returning
2902 * a status indicating whether or not it is OK to use DMA for the
2903 * supplied PACKET command.
2906 * spin_lock_irqsave(host_set lock)
2908 * RETURNS: 0 when ATAPI DMA can be used
2911 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2913 struct ata_port *ap = qc->ap;
2914 int rc = 0; /* Assume ATAPI DMA is OK by default */
2916 if (ap->ops->check_atapi_dma)
2917 rc = ap->ops->check_atapi_dma(qc);
2922 * ata_qc_prep - Prepare taskfile for submission
2923 * @qc: Metadata associated with taskfile to be prepared
2925 * Prepare ATA taskfile for submission.
2928 * spin_lock_irqsave(host_set lock)
2930 void ata_qc_prep(struct ata_queued_cmd *qc)
2932 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2938 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2941 * ata_sg_init_one - Associate command with memory buffer
2942 * @qc: Command to be associated
2943 * @buf: Memory buffer
2944 * @buflen: Length of memory buffer, in bytes.
2946 * Initialize the data-related elements of queued_cmd @qc
2947 * to point to a single memory buffer, @buf of byte length @buflen.
2950 * spin_lock_irqsave(host_set lock)
2953 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2955 struct scatterlist *sg;
2957 qc->flags |= ATA_QCFLAG_SINGLE;
2959 memset(&qc->sgent, 0, sizeof(qc->sgent));
2960 qc->__sg = &qc->sgent;
2962 qc->orig_n_elem = 1;
2966 sg_init_one(sg, buf, buflen);
2970 * ata_sg_init - Associate command with scatter-gather table.
2971 * @qc: Command to be associated
2972 * @sg: Scatter-gather table.
2973 * @n_elem: Number of elements in s/g table.
2975 * Initialize the data-related elements of queued_cmd @qc
2976 * to point to a scatter-gather table @sg, containing @n_elem
2980 * spin_lock_irqsave(host_set lock)
2983 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2984 unsigned int n_elem)
2986 qc->flags |= ATA_QCFLAG_SG;
2988 qc->n_elem = n_elem;
2989 qc->orig_n_elem = n_elem;
2993 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2994 * @qc: Command with memory buffer to be mapped.
2996 * DMA-map the memory buffer associated with queued_cmd @qc.
2999 * spin_lock_irqsave(host_set lock)
3002 * Zero on success, negative on error.
3005 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3007 struct ata_port *ap = qc->ap;
3008 int dir = qc->dma_dir;
3009 struct scatterlist *sg = qc->__sg;
3010 dma_addr_t dma_address;
3013 /* we must lengthen transfers to end on a 32-bit boundary */
3014 qc->pad_len = sg->length & 3;
3016 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3017 struct scatterlist *psg = &qc->pad_sgent;
3019 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3021 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3023 if (qc->tf.flags & ATA_TFLAG_WRITE)
3024 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3027 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3028 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3030 sg->length -= qc->pad_len;
3031 if (sg->length == 0)
3034 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3035 sg->length, qc->pad_len);
3043 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3045 if (dma_mapping_error(dma_address)) {
3047 sg->length += qc->pad_len;
3051 sg_dma_address(sg) = dma_address;
3052 sg_dma_len(sg) = sg->length;
3055 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3056 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3062 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3063 * @qc: Command with scatter-gather table to be mapped.
3065 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3068 * spin_lock_irqsave(host_set lock)
3071 * Zero on success, negative on error.
3075 static int ata_sg_setup(struct ata_queued_cmd *qc)
3077 struct ata_port *ap = qc->ap;
3078 struct scatterlist *sg = qc->__sg;
3079 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3080 int n_elem, pre_n_elem, dir, trim_sg = 0;
3082 VPRINTK("ENTER, ata%u\n", ap->id);
3083 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3085 /* we must lengthen transfers to end on a 32-bit boundary */
3086 qc->pad_len = lsg->length & 3;
3088 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3089 struct scatterlist *psg = &qc->pad_sgent;
3090 unsigned int offset;
3092 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3094 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3097 * psg->page/offset are used to copy to-be-written
3098 * data in this function or read data in ata_sg_clean.
3100 offset = lsg->offset + lsg->length - qc->pad_len;
3101 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3102 psg->offset = offset_in_page(offset);
3104 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3105 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3106 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3107 kunmap_atomic(addr, KM_IRQ0);
3110 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3111 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3113 lsg->length -= qc->pad_len;
3114 if (lsg->length == 0)
3117 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3118 qc->n_elem - 1, lsg->length, qc->pad_len);
3121 pre_n_elem = qc->n_elem;
3122 if (trim_sg && pre_n_elem)
3131 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3133 /* restore last sg */
3134 lsg->length += qc->pad_len;
3138 DPRINTK("%d sg elements mapped\n", n_elem);
3141 qc->n_elem = n_elem;
3147 * ata_poll_qc_complete - turn irq back on and finish qc
3148 * @qc: Command to complete
3149 * @err_mask: ATA status register content
3152 * None. (grabs host lock)
3155 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3157 struct ata_port *ap = qc->ap;
3158 unsigned long flags;
3160 spin_lock_irqsave(&ap->host_set->lock, flags);
3161 ap->flags &= ~ATA_FLAG_NOINTR;
3163 ata_qc_complete(qc);
3164 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3168 * ata_pio_poll - poll using PIO, depending on current state
3169 * @ap: the target ata_port
3172 * None. (executing in kernel thread context)
3175 * timeout value to use
3178 static unsigned long ata_pio_poll(struct ata_port *ap)
3180 struct ata_queued_cmd *qc;
3182 unsigned int poll_state = HSM_ST_UNKNOWN;
3183 unsigned int reg_state = HSM_ST_UNKNOWN;
3185 qc = ata_qc_from_tag(ap, ap->active_tag);
3186 WARN_ON(qc == NULL);
3188 switch (ap->hsm_task_state) {
3191 poll_state = HSM_ST_POLL;
3195 case HSM_ST_LAST_POLL:
3196 poll_state = HSM_ST_LAST_POLL;
3197 reg_state = HSM_ST_LAST;
3204 status = ata_chk_status(ap);
3205 if (status & ATA_BUSY) {
3206 if (time_after(jiffies, ap->pio_task_timeout)) {
3207 qc->err_mask |= AC_ERR_TIMEOUT;
3208 ap->hsm_task_state = HSM_ST_TMOUT;
3211 ap->hsm_task_state = poll_state;
3212 return ATA_SHORT_PAUSE;
3215 ap->hsm_task_state = reg_state;
3220 * ata_pio_complete - check if drive is busy or idle
3221 * @ap: the target ata_port
3224 * None. (executing in kernel thread context)
3227 * Non-zero if qc completed, zero otherwise.
3230 static int ata_pio_complete (struct ata_port *ap)
3232 struct ata_queued_cmd *qc;
3236 * This is purely heuristic. This is a fast path. Sometimes when
3237 * we enter, BSY will be cleared in a chk-status or two. If not,
3238 * the drive is probably seeking or something. Snooze for a couple
3239 * msecs, then chk-status again. If still busy, fall back to
3240 * HSM_ST_POLL state.
3242 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3243 if (drv_stat & ATA_BUSY) {
3245 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3246 if (drv_stat & ATA_BUSY) {
3247 ap->hsm_task_state = HSM_ST_LAST_POLL;
3248 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3253 qc = ata_qc_from_tag(ap, ap->active_tag);
3254 WARN_ON(qc == NULL);
3256 drv_stat = ata_wait_idle(ap);
3257 if (!ata_ok(drv_stat)) {
3258 qc->err_mask |= __ac_err_mask(drv_stat);
3259 ap->hsm_task_state = HSM_ST_ERR;
3263 ap->hsm_task_state = HSM_ST_IDLE;
3265 WARN_ON(qc->err_mask);
3266 ata_poll_qc_complete(qc);
3268 /* another command may start at this point */
3275 * swap_buf_le16 - swap halves of 16-bit words in place
3276 * @buf: Buffer to swap
3277 * @buf_words: Number of 16-bit words in buffer.
3279 * Swap halves of 16-bit words if needed to convert from
3280 * little-endian byte order to native cpu byte order, or
3284 * Inherited from caller.
3286 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3291 for (i = 0; i < buf_words; i++)
3292 buf[i] = le16_to_cpu(buf[i]);
3293 #endif /* __BIG_ENDIAN */
3297 * ata_mmio_data_xfer - Transfer data by MMIO
3298 * @ap: port to read/write
3300 * @buflen: buffer length
3301 * @write_data: read/write
3303 * Transfer data from/to the device data register by MMIO.
3306 * Inherited from caller.
3309 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3310 unsigned int buflen, int write_data)
3313 unsigned int words = buflen >> 1;
3314 u16 *buf16 = (u16 *) buf;
3315 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3317 /* Transfer multiple of 2 bytes */
3319 for (i = 0; i < words; i++)
3320 writew(le16_to_cpu(buf16[i]), mmio);
3322 for (i = 0; i < words; i++)
3323 buf16[i] = cpu_to_le16(readw(mmio));
3326 /* Transfer trailing 1 byte, if any. */
3327 if (unlikely(buflen & 0x01)) {
3328 u16 align_buf[1] = { 0 };
3329 unsigned char *trailing_buf = buf + buflen - 1;
3332 memcpy(align_buf, trailing_buf, 1);
3333 writew(le16_to_cpu(align_buf[0]), mmio);
3335 align_buf[0] = cpu_to_le16(readw(mmio));
3336 memcpy(trailing_buf, align_buf, 1);
3342 * ata_pio_data_xfer - Transfer data by PIO
3343 * @ap: port to read/write
3345 * @buflen: buffer length
3346 * @write_data: read/write
3348 * Transfer data from/to the device data register by PIO.
3351 * Inherited from caller.
3354 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3355 unsigned int buflen, int write_data)
3357 unsigned int words = buflen >> 1;
3359 /* Transfer multiple of 2 bytes */
3361 outsw(ap->ioaddr.data_addr, buf, words);
3363 insw(ap->ioaddr.data_addr, buf, words);
3365 /* Transfer trailing 1 byte, if any. */
3366 if (unlikely(buflen & 0x01)) {
3367 u16 align_buf[1] = { 0 };
3368 unsigned char *trailing_buf = buf + buflen - 1;
3371 memcpy(align_buf, trailing_buf, 1);
3372 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3374 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3375 memcpy(trailing_buf, align_buf, 1);
3381 * ata_data_xfer - Transfer data from/to the data register.
3382 * @ap: port to read/write
3384 * @buflen: buffer length
3385 * @do_write: read/write
3387 * Transfer data from/to the device data register.
3390 * Inherited from caller.
3393 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3394 unsigned int buflen, int do_write)
3396 /* Make the crap hardware pay the costs not the good stuff */
3397 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3398 unsigned long flags;
3399 local_irq_save(flags);
3400 if (ap->flags & ATA_FLAG_MMIO)
3401 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3403 ata_pio_data_xfer(ap, buf, buflen, do_write);
3404 local_irq_restore(flags);
3406 if (ap->flags & ATA_FLAG_MMIO)
3407 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3409 ata_pio_data_xfer(ap, buf, buflen, do_write);
3414 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3415 * @qc: Command on going
3417 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3420 * Inherited from caller.
3423 static void ata_pio_sector(struct ata_queued_cmd *qc)
3425 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3426 struct scatterlist *sg = qc->__sg;
3427 struct ata_port *ap = qc->ap;
3429 unsigned int offset;
3432 if (qc->cursect == (qc->nsect - 1))
3433 ap->hsm_task_state = HSM_ST_LAST;
3435 page = sg[qc->cursg].page;
3436 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3438 /* get the current page and offset */
3439 page = nth_page(page, (offset >> PAGE_SHIFT));
3440 offset %= PAGE_SIZE;
3442 buf = kmap(page) + offset;
3447 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3452 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3454 /* do the actual data transfer */
3455 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3456 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3462 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3463 * @qc: Command on going
3464 * @bytes: number of bytes
3466 * Transfer Transfer data from/to the ATAPI device.
3469 * Inherited from caller.
3473 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3475 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3476 struct scatterlist *sg = qc->__sg;
3477 struct ata_port *ap = qc->ap;
3480 unsigned int offset, count;
3482 if (qc->curbytes + bytes >= qc->nbytes)
3483 ap->hsm_task_state = HSM_ST_LAST;
3486 if (unlikely(qc->cursg >= qc->n_elem)) {
3488 * The end of qc->sg is reached and the device expects
3489 * more data to transfer. In order not to overrun qc->sg
3490 * and fulfill length specified in the byte count register,
3491 * - for read case, discard trailing data from the device
3492 * - for write case, padding zero data to the device
3494 u16 pad_buf[1] = { 0 };
3495 unsigned int words = bytes >> 1;
3498 if (words) /* warning if bytes > 1 */
3499 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3502 for (i = 0; i < words; i++)
3503 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3505 ap->hsm_task_state = HSM_ST_LAST;
3509 sg = &qc->__sg[qc->cursg];
3512 offset = sg->offset + qc->cursg_ofs;
3514 /* get the current page and offset */
3515 page = nth_page(page, (offset >> PAGE_SHIFT));
3516 offset %= PAGE_SIZE;
3518 /* don't overrun current sg */
3519 count = min(sg->length - qc->cursg_ofs, bytes);
3521 /* don't cross page boundaries */
3522 count = min(count, (unsigned int)PAGE_SIZE - offset);
3524 buf = kmap(page) + offset;
3527 qc->curbytes += count;
3528 qc->cursg_ofs += count;
3530 if (qc->cursg_ofs == sg->length) {
3535 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3537 /* do the actual data transfer */
3538 ata_data_xfer(ap, buf, count, do_write);
3547 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3548 * @qc: Command on going
3550 * Transfer Transfer data from/to the ATAPI device.
3553 * Inherited from caller.
3556 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3558 struct ata_port *ap = qc->ap;
3559 struct ata_device *dev = qc->dev;
3560 unsigned int ireason, bc_lo, bc_hi, bytes;
3561 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3563 ap->ops->tf_read(ap, &qc->tf);
3564 ireason = qc->tf.nsect;
3565 bc_lo = qc->tf.lbam;
3566 bc_hi = qc->tf.lbah;
3567 bytes = (bc_hi << 8) | bc_lo;
3569 /* shall be cleared to zero, indicating xfer of data */
3570 if (ireason & (1 << 0))
3573 /* make sure transfer direction matches expected */
3574 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3575 if (do_write != i_write)
3578 __atapi_pio_bytes(qc, bytes);
3583 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3584 ap->id, dev->devno);
3585 qc->err_mask |= AC_ERR_HSM;
3586 ap->hsm_task_state = HSM_ST_ERR;
3590 * ata_pio_block - start PIO on a block
3591 * @ap: the target ata_port
3594 * None. (executing in kernel thread context)
3597 static void ata_pio_block(struct ata_port *ap)
3599 struct ata_queued_cmd *qc;
3603 * This is purely heuristic. This is a fast path.
3604 * Sometimes when we enter, BSY will be cleared in
3605 * a chk-status or two. If not, the drive is probably seeking
3606 * or something. Snooze for a couple msecs, then
3607 * chk-status again. If still busy, fall back to
3608 * HSM_ST_POLL state.
3610 status = ata_busy_wait(ap, ATA_BUSY, 5);
3611 if (status & ATA_BUSY) {
3613 status = ata_busy_wait(ap, ATA_BUSY, 10);
3614 if (status & ATA_BUSY) {
3615 ap->hsm_task_state = HSM_ST_POLL;
3616 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3621 qc = ata_qc_from_tag(ap, ap->active_tag);
3622 WARN_ON(qc == NULL);
3625 if (status & (ATA_ERR | ATA_DF)) {
3626 qc->err_mask |= AC_ERR_DEV;
3627 ap->hsm_task_state = HSM_ST_ERR;
3631 /* transfer data if any */
3632 if (is_atapi_taskfile(&qc->tf)) {
3633 /* DRQ=0 means no more data to transfer */
3634 if ((status & ATA_DRQ) == 0) {
3635 ap->hsm_task_state = HSM_ST_LAST;
3639 atapi_pio_bytes(qc);
3641 /* handle BSY=0, DRQ=0 as error */
3642 if ((status & ATA_DRQ) == 0) {
3643 qc->err_mask |= AC_ERR_HSM;
3644 ap->hsm_task_state = HSM_ST_ERR;
3652 static void ata_pio_error(struct ata_port *ap)
3654 struct ata_queued_cmd *qc;
3656 qc = ata_qc_from_tag(ap, ap->active_tag);
3657 WARN_ON(qc == NULL);
3659 if (qc->tf.command != ATA_CMD_PACKET)
3660 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3662 /* make sure qc->err_mask is available to
3663 * know what's wrong and recover
3665 WARN_ON(qc->err_mask == 0);
3667 ap->hsm_task_state = HSM_ST_IDLE;
3669 ata_poll_qc_complete(qc);
3672 static void ata_pio_task(void *_data)
3674 struct ata_port *ap = _data;
3675 unsigned long timeout;
3682 switch (ap->hsm_task_state) {
3691 qc_completed = ata_pio_complete(ap);
3695 case HSM_ST_LAST_POLL:
3696 timeout = ata_pio_poll(ap);
3706 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3707 else if (!qc_completed)
3712 * atapi_packet_task - Write CDB bytes to hardware
3713 * @_data: Port to which ATAPI device is attached.
3715 * When device has indicated its readiness to accept
3716 * a CDB, this function is called. Send the CDB.
3717 * If DMA is to be performed, exit immediately.
3718 * Otherwise, we are in polling mode, so poll
3719 * status under operation succeeds or fails.
3722 * Kernel thread context (may sleep)
3725 static void atapi_packet_task(void *_data)
3727 struct ata_port *ap = _data;
3728 struct ata_queued_cmd *qc;
3731 qc = ata_qc_from_tag(ap, ap->active_tag);
3732 WARN_ON(qc == NULL);
3733 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3735 /* sleep-wait for BSY to clear */
3736 DPRINTK("busy wait\n");
3737 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3738 qc->err_mask |= AC_ERR_TIMEOUT;
3742 /* make sure DRQ is set */
3743 status = ata_chk_status(ap);
3744 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3745 qc->err_mask |= AC_ERR_HSM;
3750 DPRINTK("send cdb\n");
3751 WARN_ON(qc->dev->cdb_len < 12);
3753 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3754 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3755 unsigned long flags;
3757 /* Once we're done issuing command and kicking bmdma,
3758 * irq handler takes over. To not lose irq, we need
3759 * to clear NOINTR flag before sending cdb, but
3760 * interrupt handler shouldn't be invoked before we're
3761 * finished. Hence, the following locking.
3763 spin_lock_irqsave(&ap->host_set->lock, flags);
3764 ap->flags &= ~ATA_FLAG_NOINTR;
3765 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3766 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3767 ap->ops->bmdma_start(qc); /* initiate bmdma */
3768 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3770 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3772 /* PIO commands are handled by polling */
3773 ap->hsm_task_state = HSM_ST;
3774 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3780 ata_poll_qc_complete(qc);
3784 * ata_qc_timeout - Handle timeout of queued command
3785 * @qc: Command that timed out
3787 * Some part of the kernel (currently, only the SCSI layer)
3788 * has noticed that the active command on port @ap has not
3789 * completed after a specified length of time. Handle this
3790 * condition by disabling DMA (if necessary) and completing
3791 * transactions, with error if necessary.
3793 * This also handles the case of the "lost interrupt", where
3794 * for some reason (possibly hardware bug, possibly driver bug)
3795 * an interrupt was not delivered to the driver, even though the
3796 * transaction completed successfully.
3799 * Inherited from SCSI layer (none, can sleep)
3802 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3804 struct ata_port *ap = qc->ap;
3805 struct ata_host_set *host_set = ap->host_set;
3806 u8 host_stat = 0, drv_stat;
3807 unsigned long flags;
3811 ap->hsm_task_state = HSM_ST_IDLE;
3813 spin_lock_irqsave(&host_set->lock, flags);
3815 switch (qc->tf.protocol) {
3818 case ATA_PROT_ATAPI_DMA:
3819 host_stat = ap->ops->bmdma_status(ap);
3821 /* before we do anything else, clear DMA-Start bit */
3822 ap->ops->bmdma_stop(qc);
3828 drv_stat = ata_chk_status(ap);
3830 /* ack bmdma irq events */
3831 ap->ops->irq_clear(ap);
3833 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3834 ap->id, qc->tf.command, drv_stat, host_stat);
3836 /* complete taskfile transaction */
3837 qc->err_mask |= ac_err_mask(drv_stat);
3841 spin_unlock_irqrestore(&host_set->lock, flags);
3843 ata_eh_qc_complete(qc);
3849 * ata_eng_timeout - Handle timeout of queued command
3850 * @ap: Port on which timed-out command is active
3852 * Some part of the kernel (currently, only the SCSI layer)
3853 * has noticed that the active command on port @ap has not
3854 * completed after a specified length of time. Handle this
3855 * condition by disabling DMA (if necessary) and completing
3856 * transactions, with error if necessary.
3858 * This also handles the case of the "lost interrupt", where
3859 * for some reason (possibly hardware bug, possibly driver bug)
3860 * an interrupt was not delivered to the driver, even though the
3861 * transaction completed successfully.
3864 * Inherited from SCSI layer (none, can sleep)
3867 void ata_eng_timeout(struct ata_port *ap)
3871 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3877 * ata_qc_new - Request an available ATA command, for queueing
3878 * @ap: Port associated with device @dev
3879 * @dev: Device from whom we request an available command structure
3885 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3887 struct ata_queued_cmd *qc = NULL;
3890 for (i = 0; i < ATA_MAX_QUEUE; i++)
3891 if (!test_and_set_bit(i, &ap->qactive)) {
3892 qc = ata_qc_from_tag(ap, i);
3903 * ata_qc_new_init - Request an available ATA command, and initialize it
3904 * @ap: Port associated with device @dev
3905 * @dev: Device from whom we request an available command structure
3911 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3912 struct ata_device *dev)
3914 struct ata_queued_cmd *qc;
3916 qc = ata_qc_new(ap);
3929 * ata_qc_free - free unused ata_queued_cmd
3930 * @qc: Command to complete
3932 * Designed to free unused ata_queued_cmd object
3933 * in case something prevents using it.
3936 * spin_lock_irqsave(host_set lock)
3938 void ata_qc_free(struct ata_queued_cmd *qc)
3940 struct ata_port *ap = qc->ap;
3943 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3947 if (likely(ata_tag_valid(tag))) {
3948 if (tag == ap->active_tag)
3949 ap->active_tag = ATA_TAG_POISON;
3950 qc->tag = ATA_TAG_POISON;
3951 clear_bit(tag, &ap->qactive);
3955 void __ata_qc_complete(struct ata_queued_cmd *qc)
3957 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3958 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3960 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3963 /* atapi: mark qc as inactive to prevent the interrupt handler
3964 * from completing the command twice later, before the error handler
3965 * is called. (when rc != 0 and atapi request sense is needed)
3967 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3969 /* call completion callback */
3970 qc->complete_fn(qc);
3973 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3975 struct ata_port *ap = qc->ap;
3977 switch (qc->tf.protocol) {
3979 case ATA_PROT_ATAPI_DMA:
3982 case ATA_PROT_ATAPI:
3984 if (ap->flags & ATA_FLAG_PIO_DMA)
3997 * ata_qc_issue - issue taskfile to device
3998 * @qc: command to issue to device
4000 * Prepare an ATA command to submission to device.
4001 * This includes mapping the data into a DMA-able
4002 * area, filling in the S/G table, and finally
4003 * writing the taskfile to hardware, starting the command.
4006 * spin_lock_irqsave(host_set lock)
4008 void ata_qc_issue(struct ata_queued_cmd *qc)
4010 struct ata_port *ap = qc->ap;
4012 qc->ap->active_tag = qc->tag;
4013 qc->flags |= ATA_QCFLAG_ACTIVE;
4015 if (ata_should_dma_map(qc)) {
4016 if (qc->flags & ATA_QCFLAG_SG) {
4017 if (ata_sg_setup(qc))
4019 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4020 if (ata_sg_setup_one(qc))
4024 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4027 ap->ops->qc_prep(qc);
4029 qc->err_mask |= ap->ops->qc_issue(qc);
4030 if (unlikely(qc->err_mask))
4035 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4036 qc->err_mask |= AC_ERR_SYSTEM;
4038 ata_qc_complete(qc);
4042 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4043 * @qc: command to issue to device
4045 * Using various libata functions and hooks, this function
4046 * starts an ATA command. ATA commands are grouped into
4047 * classes called "protocols", and issuing each type of protocol
4048 * is slightly different.
4050 * May be used as the qc_issue() entry in ata_port_operations.
4053 * spin_lock_irqsave(host_set lock)
4056 * Zero on success, AC_ERR_* mask on failure
4059 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4061 struct ata_port *ap = qc->ap;
4063 ata_dev_select(ap, qc->dev->devno, 1, 0);
4065 switch (qc->tf.protocol) {
4066 case ATA_PROT_NODATA:
4067 ata_tf_to_host(ap, &qc->tf);
4071 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4072 ap->ops->bmdma_setup(qc); /* set up bmdma */
4073 ap->ops->bmdma_start(qc); /* initiate bmdma */
4076 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4077 ata_qc_set_polling(qc);
4078 ata_tf_to_host(ap, &qc->tf);
4079 ap->hsm_task_state = HSM_ST;
4080 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4083 case ATA_PROT_ATAPI:
4084 ata_qc_set_polling(qc);
4085 ata_tf_to_host(ap, &qc->tf);
4086 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4089 case ATA_PROT_ATAPI_NODATA:
4090 ap->flags |= ATA_FLAG_NOINTR;
4091 ata_tf_to_host(ap, &qc->tf);
4092 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4095 case ATA_PROT_ATAPI_DMA:
4096 ap->flags |= ATA_FLAG_NOINTR;
4097 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4098 ap->ops->bmdma_setup(qc); /* set up bmdma */
4099 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4104 return AC_ERR_SYSTEM;
4111 * ata_host_intr - Handle host interrupt for given (port, task)
4112 * @ap: Port on which interrupt arrived (possibly...)
4113 * @qc: Taskfile currently active in engine
4115 * Handle host interrupt for given queued command. Currently,
4116 * only DMA interrupts are handled. All other commands are
4117 * handled via polling with interrupts disabled (nIEN bit).
4120 * spin_lock_irqsave(host_set lock)
4123 * One if interrupt was handled, zero if not (shared irq).
4126 inline unsigned int ata_host_intr (struct ata_port *ap,
4127 struct ata_queued_cmd *qc)
4129 u8 status, host_stat;
4131 switch (qc->tf.protocol) {
4134 case ATA_PROT_ATAPI_DMA:
4135 case ATA_PROT_ATAPI:
4136 /* check status of DMA engine */
4137 host_stat = ap->ops->bmdma_status(ap);
4138 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4140 /* if it's not our irq... */
4141 if (!(host_stat & ATA_DMA_INTR))
4144 /* before we do anything else, clear DMA-Start bit */
4145 ap->ops->bmdma_stop(qc);
4149 case ATA_PROT_ATAPI_NODATA:
4150 case ATA_PROT_NODATA:
4151 /* check altstatus */
4152 status = ata_altstatus(ap);
4153 if (status & ATA_BUSY)
4156 /* check main status, clearing INTRQ */
4157 status = ata_chk_status(ap);
4158 if (unlikely(status & ATA_BUSY))
4160 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4161 ap->id, qc->tf.protocol, status);
4163 /* ack bmdma irq events */
4164 ap->ops->irq_clear(ap);
4166 /* complete taskfile transaction */
4167 qc->err_mask |= ac_err_mask(status);
4168 ata_qc_complete(qc);
4175 return 1; /* irq handled */
4178 ap->stats.idle_irq++;
4181 if ((ap->stats.idle_irq % 1000) == 0) {
4182 ata_irq_ack(ap, 0); /* debug trap */
4183 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4187 return 0; /* irq not handled */
4191 * ata_interrupt - Default ATA host interrupt handler
4192 * @irq: irq line (unused)
4193 * @dev_instance: pointer to our ata_host_set information structure
4196 * Default interrupt handler for PCI IDE devices. Calls
4197 * ata_host_intr() for each port that is not disabled.
4200 * Obtains host_set lock during operation.
4203 * IRQ_NONE or IRQ_HANDLED.
4206 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4208 struct ata_host_set *host_set = dev_instance;
4210 unsigned int handled = 0;
4211 unsigned long flags;
4213 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4214 spin_lock_irqsave(&host_set->lock, flags);
4216 for (i = 0; i < host_set->n_ports; i++) {
4217 struct ata_port *ap;
4219 ap = host_set->ports[i];
4221 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4222 struct ata_queued_cmd *qc;
4224 qc = ata_qc_from_tag(ap, ap->active_tag);
4225 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4226 (qc->flags & ATA_QCFLAG_ACTIVE))
4227 handled |= ata_host_intr(ap, qc);
4231 spin_unlock_irqrestore(&host_set->lock, flags);
4233 return IRQ_RETVAL(handled);
4238 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4239 * without filling any other registers
4241 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4244 struct ata_taskfile tf;
4247 ata_tf_init(ap, &tf, dev->devno);
4250 tf.flags |= ATA_TFLAG_DEVICE;
4251 tf.protocol = ATA_PROT_NODATA;
4253 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4255 printk(KERN_ERR "%s: ata command failed: %d\n",
4261 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4265 if (!ata_try_flush_cache(dev))
4268 if (ata_id_has_flush_ext(dev->id))
4269 cmd = ATA_CMD_FLUSH_EXT;
4271 cmd = ATA_CMD_FLUSH;
4273 return ata_do_simple_cmd(ap, dev, cmd);
4276 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4278 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4281 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4283 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4287 * ata_device_resume - wakeup a previously suspended devices
4288 * @ap: port the device is connected to
4289 * @dev: the device to resume
4291 * Kick the drive back into action, by sending it an idle immediate
4292 * command and making sure its transfer mode matches between drive
4296 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4298 if (ap->flags & ATA_FLAG_SUSPENDED) {
4299 ap->flags &= ~ATA_FLAG_SUSPENDED;
4302 if (!ata_dev_present(dev))
4304 if (dev->class == ATA_DEV_ATA)
4305 ata_start_drive(ap, dev);
4311 * ata_device_suspend - prepare a device for suspend
4312 * @ap: port the device is connected to
4313 * @dev: the device to suspend
4315 * Flush the cache on the drive, if appropriate, then issue a
4316 * standbynow command.
4318 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4320 if (!ata_dev_present(dev))
4322 if (dev->class == ATA_DEV_ATA)
4323 ata_flush_cache(ap, dev);
4325 if (state.event != PM_EVENT_FREEZE)
4326 ata_standby_drive(ap, dev);
4327 ap->flags |= ATA_FLAG_SUSPENDED;
4332 * ata_port_start - Set port up for dma.
4333 * @ap: Port to initialize
4335 * Called just after data structures for each port are
4336 * initialized. Allocates space for PRD table.
4338 * May be used as the port_start() entry in ata_port_operations.
4341 * Inherited from caller.
4344 int ata_port_start (struct ata_port *ap)
4346 struct device *dev = ap->dev;
4349 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4353 rc = ata_pad_alloc(ap, dev);
4355 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4359 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4366 * ata_port_stop - Undo ata_port_start()
4367 * @ap: Port to shut down
4369 * Frees the PRD table.
4371 * May be used as the port_stop() entry in ata_port_operations.
4374 * Inherited from caller.
4377 void ata_port_stop (struct ata_port *ap)
4379 struct device *dev = ap->dev;
4381 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4382 ata_pad_free(ap, dev);
4385 void ata_host_stop (struct ata_host_set *host_set)
4387 if (host_set->mmio_base)
4388 iounmap(host_set->mmio_base);
4393 * ata_host_remove - Unregister SCSI host structure with upper layers
4394 * @ap: Port to unregister
4395 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4398 * Inherited from caller.
4401 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4403 struct Scsi_Host *sh = ap->host;
4408 scsi_remove_host(sh);
4410 ap->ops->port_stop(ap);
4414 * ata_host_init - Initialize an ata_port structure
4415 * @ap: Structure to initialize
4416 * @host: associated SCSI mid-layer structure
4417 * @host_set: Collection of hosts to which @ap belongs
4418 * @ent: Probe information provided by low-level driver
4419 * @port_no: Port number associated with this ata_port
4421 * Initialize a new ata_port structure, and its associated
4425 * Inherited from caller.
4428 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4429 struct ata_host_set *host_set,
4430 const struct ata_probe_ent *ent, unsigned int port_no)
4436 host->max_channel = 1;
4437 host->unique_id = ata_unique_id++;
4438 host->max_cmd_len = 12;
4440 ap->flags = ATA_FLAG_PORT_DISABLED;
4441 ap->id = host->unique_id;
4443 ap->ctl = ATA_DEVCTL_OBS;
4444 ap->host_set = host_set;
4446 ap->port_no = port_no;
4448 ent->legacy_mode ? ent->hard_port_no : port_no;
4449 ap->pio_mask = ent->pio_mask;
4450 ap->mwdma_mask = ent->mwdma_mask;
4451 ap->udma_mask = ent->udma_mask;
4452 ap->flags |= ent->host_flags;
4453 ap->ops = ent->port_ops;
4454 ap->cbl = ATA_CBL_NONE;
4455 ap->active_tag = ATA_TAG_POISON;
4456 ap->last_ctl = 0xFF;
4458 INIT_WORK(&ap->port_task, NULL, NULL);
4459 INIT_LIST_HEAD(&ap->eh_done_q);
4461 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4462 struct ata_device *dev = &ap->device[i];
4464 dev->pio_mask = UINT_MAX;
4465 dev->mwdma_mask = UINT_MAX;
4466 dev->udma_mask = UINT_MAX;
4470 ap->stats.unhandled_irq = 1;
4471 ap->stats.idle_irq = 1;
4474 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4478 * ata_host_add - Attach low-level ATA driver to system
4479 * @ent: Information provided by low-level driver
4480 * @host_set: Collections of ports to which we add
4481 * @port_no: Port number associated with this host
4483 * Attach low-level ATA driver to system.
4486 * PCI/etc. bus probe sem.
4489 * New ata_port on success, for NULL on error.
4492 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4493 struct ata_host_set *host_set,
4494 unsigned int port_no)
4496 struct Scsi_Host *host;
4497 struct ata_port *ap;
4502 if (!ent->port_ops->probe_reset &&
4503 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4504 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4509 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4513 host->transportt = &ata_scsi_transport_template;
4515 ap = (struct ata_port *) &host->hostdata[0];
4517 ata_host_init(ap, host, host_set, ent, port_no);
4519 rc = ap->ops->port_start(ap);
4526 scsi_host_put(host);
4531 * ata_device_add - Register hardware device with ATA and SCSI layers
4532 * @ent: Probe information describing hardware device to be registered
4534 * This function processes the information provided in the probe
4535 * information struct @ent, allocates the necessary ATA and SCSI
4536 * host information structures, initializes them, and registers
4537 * everything with requisite kernel subsystems.
4539 * This function requests irqs, probes the ATA bus, and probes
4543 * PCI/etc. bus probe sem.
4546 * Number of ports registered. Zero on error (no ports registered).
4549 int ata_device_add(const struct ata_probe_ent *ent)
4551 unsigned int count = 0, i;
4552 struct device *dev = ent->dev;
4553 struct ata_host_set *host_set;
4556 /* alloc a container for our list of ATA ports (buses) */
4557 host_set = kzalloc(sizeof(struct ata_host_set) +
4558 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4561 spin_lock_init(&host_set->lock);
4563 host_set->dev = dev;
4564 host_set->n_ports = ent->n_ports;
4565 host_set->irq = ent->irq;
4566 host_set->mmio_base = ent->mmio_base;
4567 host_set->private_data = ent->private_data;
4568 host_set->ops = ent->port_ops;
4569 host_set->flags = ent->host_set_flags;
4571 /* register each port bound to this device */
4572 for (i = 0; i < ent->n_ports; i++) {
4573 struct ata_port *ap;
4574 unsigned long xfer_mode_mask;
4576 ap = ata_host_add(ent, host_set, i);
4580 host_set->ports[i] = ap;
4581 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4582 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4583 (ap->pio_mask << ATA_SHIFT_PIO);
4585 /* print per-port info to dmesg */
4586 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4587 "bmdma 0x%lX irq %lu\n",
4589 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4590 ata_mode_string(xfer_mode_mask),
4591 ap->ioaddr.cmd_addr,
4592 ap->ioaddr.ctl_addr,
4593 ap->ioaddr.bmdma_addr,
4597 host_set->ops->irq_clear(ap);
4604 /* obtain irq, that is shared between channels */
4605 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4606 DRV_NAME, host_set))
4609 /* perform each probe synchronously */
4610 DPRINTK("probe begin\n");
4611 for (i = 0; i < count; i++) {
4612 struct ata_port *ap;
4615 ap = host_set->ports[i];
4617 DPRINTK("ata%u: bus probe begin\n", ap->id);
4618 rc = ata_bus_probe(ap);
4619 DPRINTK("ata%u: bus probe end\n", ap->id);
4622 /* FIXME: do something useful here?
4623 * Current libata behavior will
4624 * tear down everything when
4625 * the module is removed
4626 * or the h/w is unplugged.
4630 rc = scsi_add_host(ap->host, dev);
4632 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4634 /* FIXME: do something useful here */
4635 /* FIXME: handle unconditional calls to
4636 * scsi_scan_host and ata_host_remove, below,
4642 /* probes are done, now scan each port's disk(s) */
4643 DPRINTK("host probe begin\n");
4644 for (i = 0; i < count; i++) {
4645 struct ata_port *ap = host_set->ports[i];
4647 ata_scsi_scan_host(ap);
4650 dev_set_drvdata(dev, host_set);
4652 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4653 return ent->n_ports; /* success */
4656 for (i = 0; i < count; i++) {
4657 ata_host_remove(host_set->ports[i], 1);
4658 scsi_host_put(host_set->ports[i]->host);
4662 VPRINTK("EXIT, returning 0\n");
4667 * ata_host_set_remove - PCI layer callback for device removal
4668 * @host_set: ATA host set that was removed
4670 * Unregister all objects associated with this host set. Free those
4674 * Inherited from calling layer (may sleep).
4677 void ata_host_set_remove(struct ata_host_set *host_set)
4679 struct ata_port *ap;
4682 for (i = 0; i < host_set->n_ports; i++) {
4683 ap = host_set->ports[i];
4684 scsi_remove_host(ap->host);
4687 free_irq(host_set->irq, host_set);
4689 for (i = 0; i < host_set->n_ports; i++) {
4690 ap = host_set->ports[i];
4692 ata_scsi_release(ap->host);
4694 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4695 struct ata_ioports *ioaddr = &ap->ioaddr;
4697 if (ioaddr->cmd_addr == 0x1f0)
4698 release_region(0x1f0, 8);
4699 else if (ioaddr->cmd_addr == 0x170)
4700 release_region(0x170, 8);
4703 scsi_host_put(ap->host);
4706 if (host_set->ops->host_stop)
4707 host_set->ops->host_stop(host_set);
4713 * ata_scsi_release - SCSI layer callback hook for host unload
4714 * @host: libata host to be unloaded
4716 * Performs all duties necessary to shut down a libata port...
4717 * Kill port kthread, disable port, and release resources.
4720 * Inherited from SCSI layer.
4726 int ata_scsi_release(struct Scsi_Host *host)
4728 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4733 ap->ops->port_disable(ap);
4734 ata_host_remove(ap, 0);
4735 for (i = 0; i < ATA_MAX_DEVICES; i++)
4736 kfree(ap->device[i].id);
4743 * ata_std_ports - initialize ioaddr with standard port offsets.
4744 * @ioaddr: IO address structure to be initialized
4746 * Utility function which initializes data_addr, error_addr,
4747 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4748 * device_addr, status_addr, and command_addr to standard offsets
4749 * relative to cmd_addr.
4751 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4754 void ata_std_ports(struct ata_ioports *ioaddr)
4756 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4757 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4758 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4759 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4760 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4761 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4762 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4763 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4764 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4765 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4771 void ata_pci_host_stop (struct ata_host_set *host_set)
4773 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4775 pci_iounmap(pdev, host_set->mmio_base);
4779 * ata_pci_remove_one - PCI layer callback for device removal
4780 * @pdev: PCI device that was removed
4782 * PCI layer indicates to libata via this hook that
4783 * hot-unplug or module unload event has occurred.
4784 * Handle this by unregistering all objects associated
4785 * with this PCI device. Free those objects. Then finally
4786 * release PCI resources and disable device.
4789 * Inherited from PCI layer (may sleep).
4792 void ata_pci_remove_one (struct pci_dev *pdev)
4794 struct device *dev = pci_dev_to_dev(pdev);
4795 struct ata_host_set *host_set = dev_get_drvdata(dev);
4797 ata_host_set_remove(host_set);
4798 pci_release_regions(pdev);
4799 pci_disable_device(pdev);
4800 dev_set_drvdata(dev, NULL);
4803 /* move to PCI subsystem */
4804 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4806 unsigned long tmp = 0;
4808 switch (bits->width) {
4811 pci_read_config_byte(pdev, bits->reg, &tmp8);
4817 pci_read_config_word(pdev, bits->reg, &tmp16);
4823 pci_read_config_dword(pdev, bits->reg, &tmp32);
4834 return (tmp == bits->val) ? 1 : 0;
4837 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4839 pci_save_state(pdev);
4840 pci_disable_device(pdev);
4841 pci_set_power_state(pdev, PCI_D3hot);
4845 int ata_pci_device_resume(struct pci_dev *pdev)
4847 pci_set_power_state(pdev, PCI_D0);
4848 pci_restore_state(pdev);
4849 pci_enable_device(pdev);
4850 pci_set_master(pdev);
4853 #endif /* CONFIG_PCI */
4856 static int __init ata_init(void)
4858 ata_wq = create_workqueue("ata");
4862 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4866 static void __exit ata_exit(void)
4868 destroy_workqueue(ata_wq);
4871 module_init(ata_init);
4872 module_exit(ata_exit);
4874 static unsigned long ratelimit_time;
4875 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4877 int ata_ratelimit(void)
4880 unsigned long flags;
4882 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4884 if (time_after(jiffies, ratelimit_time)) {
4886 ratelimit_time = jiffies + (HZ/5);
4890 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4896 * libata is essentially a library of internal helper functions for
4897 * low-level ATA host controller drivers. As such, the API/ABI is
4898 * likely to change as new drivers are added and updated.
4899 * Do not depend on ABI/API stability.
4902 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4903 EXPORT_SYMBOL_GPL(ata_std_ports);
4904 EXPORT_SYMBOL_GPL(ata_device_add);
4905 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4906 EXPORT_SYMBOL_GPL(ata_sg_init);
4907 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4908 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4909 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4910 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4911 EXPORT_SYMBOL_GPL(ata_tf_load);
4912 EXPORT_SYMBOL_GPL(ata_tf_read);
4913 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4914 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4915 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4916 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4917 EXPORT_SYMBOL_GPL(ata_check_status);
4918 EXPORT_SYMBOL_GPL(ata_altstatus);
4919 EXPORT_SYMBOL_GPL(ata_exec_command);
4920 EXPORT_SYMBOL_GPL(ata_port_start);
4921 EXPORT_SYMBOL_GPL(ata_port_stop);
4922 EXPORT_SYMBOL_GPL(ata_host_stop);
4923 EXPORT_SYMBOL_GPL(ata_interrupt);
4924 EXPORT_SYMBOL_GPL(ata_qc_prep);
4925 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4926 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4927 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4928 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4929 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4930 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4931 EXPORT_SYMBOL_GPL(ata_port_probe);
4932 EXPORT_SYMBOL_GPL(sata_phy_reset);
4933 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4934 EXPORT_SYMBOL_GPL(ata_bus_reset);
4935 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4936 EXPORT_SYMBOL_GPL(ata_std_softreset);
4937 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4938 EXPORT_SYMBOL_GPL(ata_std_postreset);
4939 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4940 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4941 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4942 EXPORT_SYMBOL_GPL(ata_dev_classify);
4943 EXPORT_SYMBOL_GPL(ata_dev_pair);
4944 EXPORT_SYMBOL_GPL(ata_port_disable);
4945 EXPORT_SYMBOL_GPL(ata_ratelimit);
4946 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4947 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4948 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4949 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4950 EXPORT_SYMBOL_GPL(ata_scsi_error);
4951 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4952 EXPORT_SYMBOL_GPL(ata_scsi_release);
4953 EXPORT_SYMBOL_GPL(ata_host_intr);
4954 EXPORT_SYMBOL_GPL(ata_id_string);
4955 EXPORT_SYMBOL_GPL(ata_id_c_string);
4956 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4957 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4958 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4960 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4961 EXPORT_SYMBOL_GPL(ata_timing_compute);
4962 EXPORT_SYMBOL_GPL(ata_timing_merge);
4965 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4966 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4967 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4968 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4969 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4970 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4971 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4972 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4973 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4974 #endif /* CONFIG_PCI */
4976 EXPORT_SYMBOL_GPL(ata_device_suspend);
4977 EXPORT_SYMBOL_GPL(ata_device_resume);
4978 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4979 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);