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 void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
);
65 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
);
69 static int fgb(u32 bitmap
);
70 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
72 unsigned int *xfer_shift_out
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 int atapi_enabled
= 0;
78 module_param(atapi_enabled
, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION
);
88 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
97 * Inherited from caller.
100 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
102 fis
[0] = 0x27; /* Register - Host to Device FIS */
103 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis
[2] = tf
->command
;
106 fis
[3] = tf
->feature
;
113 fis
[8] = tf
->hob_lbal
;
114 fis
[9] = tf
->hob_lbam
;
115 fis
[10] = tf
->hob_lbah
;
116 fis
[11] = tf
->hob_feature
;
119 fis
[13] = tf
->hob_nsect
;
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
137 * Inherited from caller.
140 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
142 tf
->command
= fis
[2]; /* status */
143 tf
->feature
= fis
[3]; /* error */
150 tf
->hob_lbal
= fis
[8];
151 tf
->hob_lbam
= fis
[9];
152 tf
->hob_lbah
= fis
[10];
155 tf
->hob_nsect
= fis
[13];
158 static const u8 ata_rw_cmds
[] = {
162 ATA_CMD_READ_MULTI_EXT
,
163 ATA_CMD_WRITE_MULTI_EXT
,
167 ATA_CMD_WRITE_MULTI_FUA_EXT
,
171 ATA_CMD_PIO_READ_EXT
,
172 ATA_CMD_PIO_WRITE_EXT
,
185 ATA_CMD_WRITE_FUA_EXT
189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
198 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
200 struct ata_taskfile
*tf
= &qc
->tf
;
201 struct ata_device
*dev
= qc
->dev
;
204 int index
, fua
, lba48
, write
;
206 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
207 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
208 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
210 if (dev
->flags
& ATA_DFLAG_PIO
) {
211 tf
->protocol
= ATA_PROT_PIO
;
212 index
= dev
->multi_count
? 0 : 8;
213 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
214 /* Unable to use DMA due to host limitation */
215 tf
->protocol
= ATA_PROT_PIO
;
216 index
= dev
->multi_count
? 0 : 4;
218 tf
->protocol
= ATA_PROT_DMA
;
222 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
230 static const char * const xfer_mode_str
[] = {
250 * ata_udma_string - convert UDMA bit offset to string
251 * @mask: mask of bits supported; only highest bit counts.
253 * Determine string which represents the highest speed
254 * (highest bit in @udma_mask).
260 * Constant C string representing highest speed listed in
261 * @udma_mask, or the constant C string "<n/a>".
264 static const char *ata_mode_string(unsigned int mask
)
268 for (i
= 7; i
>= 0; i
--)
271 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
274 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
281 return xfer_mode_str
[i
];
285 * ata_pio_devchk - PATA device presence detection
286 * @ap: ATA channel to examine
287 * @device: Device to examine (starting at zero)
289 * This technique was originally described in
290 * Hale Landis's ATADRVR (www.ata-atapi.com), and
291 * later found its way into the ATA/ATAPI spec.
293 * Write a pattern to the ATA shadow registers,
294 * and if a device is present, it will respond by
295 * correctly storing and echoing back the
296 * ATA shadow register contents.
302 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
305 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
308 ap
->ops
->dev_select(ap
, device
);
310 outb(0x55, ioaddr
->nsect_addr
);
311 outb(0xaa, ioaddr
->lbal_addr
);
313 outb(0xaa, ioaddr
->nsect_addr
);
314 outb(0x55, ioaddr
->lbal_addr
);
316 outb(0x55, ioaddr
->nsect_addr
);
317 outb(0xaa, ioaddr
->lbal_addr
);
319 nsect
= inb(ioaddr
->nsect_addr
);
320 lbal
= inb(ioaddr
->lbal_addr
);
322 if ((nsect
== 0x55) && (lbal
== 0xaa))
323 return 1; /* we found a device */
325 return 0; /* nothing found */
329 * ata_mmio_devchk - PATA device presence detection
330 * @ap: ATA channel to examine
331 * @device: Device to examine (starting at zero)
333 * This technique was originally described in
334 * Hale Landis's ATADRVR (www.ata-atapi.com), and
335 * later found its way into the ATA/ATAPI spec.
337 * Write a pattern to the ATA shadow registers,
338 * and if a device is present, it will respond by
339 * correctly storing and echoing back the
340 * ATA shadow register contents.
346 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
349 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
352 ap
->ops
->dev_select(ap
, device
);
354 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
355 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
357 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
358 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
360 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
361 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
363 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
364 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
366 if ((nsect
== 0x55) && (lbal
== 0xaa))
367 return 1; /* we found a device */
369 return 0; /* nothing found */
373 * ata_devchk - PATA device presence detection
374 * @ap: ATA channel to examine
375 * @device: Device to examine (starting at zero)
377 * Dispatch ATA device presence detection, depending
378 * on whether we are using PIO or MMIO to talk to the
379 * ATA shadow registers.
385 static unsigned int ata_devchk(struct ata_port
*ap
,
388 if (ap
->flags
& ATA_FLAG_MMIO
)
389 return ata_mmio_devchk(ap
, device
);
390 return ata_pio_devchk(ap
, device
);
394 * ata_dev_classify - determine device type based on ATA-spec signature
395 * @tf: ATA taskfile register set for device to be identified
397 * Determine from taskfile register contents whether a device is
398 * ATA or ATAPI, as per "Signature and persistence" section
399 * of ATA/PI spec (volume 1, sect 5.14).
405 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
406 * the event of failure.
409 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
411 /* Apple's open source Darwin code hints that some devices only
412 * put a proper signature into the LBA mid/high registers,
413 * So, we only check those. It's sufficient for uniqueness.
416 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
417 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
418 DPRINTK("found ATA device by sig\n");
422 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
423 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
424 DPRINTK("found ATAPI device by sig\n");
425 return ATA_DEV_ATAPI
;
428 DPRINTK("unknown device\n");
429 return ATA_DEV_UNKNOWN
;
433 * ata_dev_try_classify - Parse returned ATA device signature
434 * @ap: ATA channel to examine
435 * @device: Device to examine (starting at zero)
436 * @r_err: Value of error register on completion
438 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
439 * an ATA/ATAPI-defined set of values is placed in the ATA
440 * shadow registers, indicating the results of device detection
443 * Select the ATA device, and read the values from the ATA shadow
444 * registers. Then parse according to the Error register value,
445 * and the spec-defined values examined by ata_dev_classify().
451 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
455 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
457 struct ata_taskfile tf
;
461 ap
->ops
->dev_select(ap
, device
);
463 memset(&tf
, 0, sizeof(tf
));
465 ap
->ops
->tf_read(ap
, &tf
);
470 /* see if device passed diags */
473 else if ((device
== 0) && (err
== 0x81))
478 /* determine if device is ATA or ATAPI */
479 class = ata_dev_classify(&tf
);
481 if (class == ATA_DEV_UNKNOWN
)
483 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
489 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
490 * @id: IDENTIFY DEVICE results we will examine
491 * @s: string into which data is output
492 * @ofs: offset into identify device page
493 * @len: length of string to return. must be an even number.
495 * The strings in the IDENTIFY DEVICE page are broken up into
496 * 16-bit chunks. Run through the string, and output each
497 * 8-bit chunk linearly, regardless of platform.
503 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
504 unsigned int ofs
, unsigned int len
)
524 * ata_noop_dev_select - Select device 0/1 on ATA bus
525 * @ap: ATA channel to manipulate
526 * @device: ATA device (numbered from zero) to select
528 * This function performs no actual function.
530 * May be used as the dev_select() entry in ata_port_operations.
535 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
541 * ata_std_dev_select - Select device 0/1 on ATA bus
542 * @ap: ATA channel to manipulate
543 * @device: ATA device (numbered from zero) to select
545 * Use the method defined in the ATA specification to
546 * make either device 0, or device 1, active on the
547 * ATA channel. Works with both PIO and MMIO.
549 * May be used as the dev_select() entry in ata_port_operations.
555 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
560 tmp
= ATA_DEVICE_OBS
;
562 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
564 if (ap
->flags
& ATA_FLAG_MMIO
) {
565 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
567 outb(tmp
, ap
->ioaddr
.device_addr
);
569 ata_pause(ap
); /* needed; also flushes, for mmio */
573 * ata_dev_select - Select device 0/1 on ATA bus
574 * @ap: ATA channel to manipulate
575 * @device: ATA device (numbered from zero) to select
576 * @wait: non-zero to wait for Status register BSY bit to clear
577 * @can_sleep: non-zero if context allows sleeping
579 * Use the method defined in the ATA specification to
580 * make either device 0, or device 1, active on the
583 * This is a high-level version of ata_std_dev_select(),
584 * which additionally provides the services of inserting
585 * the proper pauses and status polling, where needed.
591 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
592 unsigned int wait
, unsigned int can_sleep
)
594 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
595 ap
->id
, device
, wait
);
600 ap
->ops
->dev_select(ap
, device
);
603 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
610 * ata_dump_id - IDENTIFY DEVICE info debugging output
611 * @dev: Device whose IDENTIFY DEVICE page we will dump
613 * Dump selected 16-bit words from a detected device's
614 * IDENTIFY PAGE page.
620 static inline void ata_dump_id(const struct ata_device
*dev
)
622 DPRINTK("49==0x%04x "
632 DPRINTK("80==0x%04x "
642 DPRINTK("88==0x%04x "
649 * Compute the PIO modes available for this device. This is not as
650 * trivial as it seems if we must consider early devices correctly.
652 * FIXME: pre IDE drive timing (do we care ?).
655 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
659 /* Usual case. Word 53 indicates word 64 is valid */
660 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
661 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
667 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
668 number for the maximum. Turn it into a mask and return it */
669 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
671 /* But wait.. there's more. Design your standards by committee and
672 you too can get a free iordy field to process. However its the
673 speeds not the modes that are supported... Note drivers using the
674 timing API will get this right anyway */
678 ata_queue_packet_task(struct ata_port
*ap
)
680 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
681 queue_work(ata_wq
, &ap
->packet_task
);
685 ata_queue_pio_task(struct ata_port
*ap
)
687 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
688 queue_work(ata_wq
, &ap
->pio_task
);
692 ata_queue_delayed_pio_task(struct ata_port
*ap
, unsigned long delay
)
694 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
695 queue_delayed_work(ata_wq
, &ap
->pio_task
, delay
);
699 * ata_flush_pio_tasks - Flush pio_task and packet_task
700 * @ap: the target ata_port
702 * After this function completes, pio_task and packet_task are
703 * guranteed not to be running or scheduled.
706 * Kernel thread context (may sleep)
709 static void ata_flush_pio_tasks(struct ata_port
*ap
)
716 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
717 ap
->flags
|= ATA_FLAG_FLUSH_PIO_TASK
;
718 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
720 DPRINTK("flush #1\n");
721 flush_workqueue(ata_wq
);
724 * At this point, if a task is running, it's guaranteed to see
725 * the FLUSH flag; thus, it will never queue pio tasks again.
728 tmp
|= cancel_delayed_work(&ap
->pio_task
);
729 tmp
|= cancel_delayed_work(&ap
->packet_task
);
731 DPRINTK("flush #2\n");
732 flush_workqueue(ata_wq
);
735 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
736 ap
->flags
&= ~ATA_FLAG_FLUSH_PIO_TASK
;
737 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
742 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
744 struct completion
*waiting
= qc
->private_data
;
746 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
751 * ata_exec_internal - execute libata internal command
752 * @ap: Port to which the command is sent
753 * @dev: Device to which the command is sent
754 * @tf: Taskfile registers for the command and the result
755 * @dma_dir: Data tranfer direction of the command
756 * @buf: Data buffer of the command
757 * @buflen: Length of data buffer
759 * Executes libata internal command with timeout. @tf contains
760 * command on entry and result on return. Timeout and error
761 * conditions are reported via return value. No recovery action
762 * is taken after a command times out. It's caller's duty to
763 * clean up after timeout.
766 * None. Should be called with kernel context, might sleep.
770 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
771 struct ata_taskfile
*tf
,
772 int dma_dir
, void *buf
, unsigned int buflen
)
774 u8 command
= tf
->command
;
775 struct ata_queued_cmd
*qc
;
776 DECLARE_COMPLETION(wait
);
778 unsigned int err_mask
;
780 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
782 qc
= ata_qc_new_init(ap
, dev
);
786 qc
->dma_dir
= dma_dir
;
787 if (dma_dir
!= DMA_NONE
) {
788 ata_sg_init_one(qc
, buf
, buflen
);
789 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
792 qc
->private_data
= &wait
;
793 qc
->complete_fn
= ata_qc_complete_internal
;
795 qc
->err_mask
= ata_qc_issue(qc
);
799 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
801 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
802 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
804 /* We're racing with irq here. If we lose, the
805 * following test prevents us from completing the qc
806 * again. If completion irq occurs after here but
807 * before the caller cleans up, it will result in a
808 * spurious interrupt. We can live with that.
810 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
811 qc
->err_mask
= AC_ERR_TIMEOUT
;
813 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
817 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
821 err_mask
= qc
->err_mask
;
829 * ata_pio_need_iordy - check if iordy needed
832 * Check if the current speed of the device requires IORDY. Used
833 * by various controllers for chip configuration.
836 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
839 int speed
= adev
->pio_mode
- XFER_PIO_0
;
846 /* If we have no drive specific rule, then PIO 2 is non IORDY */
848 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
849 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
850 /* Is the speed faster than the drive allows non IORDY ? */
852 /* This is cycle times not frequency - watch the logic! */
853 if (pio
> 240) /* PIO2 is 240nS per cycle */
862 * ata_dev_identify - obtain IDENTIFY x DEVICE page
863 * @ap: port on which device we wish to probe resides
864 * @device: device bus address, starting at zero
866 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
867 * command, and read back the 512-byte device information page.
868 * The device information page is fed to us via the standard
869 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
870 * using standard PIO-IN paths)
872 * After reading the device information page, we use several
873 * bits of information from it to initialize data structures
874 * that will be used during the lifetime of the ata_device.
875 * Other data from the info page is used to disqualify certain
876 * older ATA devices we do not wish to support.
879 * Inherited from caller. Some functions called by this function
880 * obtain the host_set lock.
883 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
885 struct ata_device
*dev
= &ap
->device
[device
];
886 unsigned int major_version
;
888 unsigned long xfer_modes
;
889 unsigned int using_edd
;
890 struct ata_taskfile tf
;
891 unsigned int err_mask
;
894 if (!ata_dev_present(dev
)) {
895 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
900 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
905 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
907 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
908 dev
->class == ATA_DEV_NONE
);
910 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
913 ata_tf_init(ap
, &tf
, device
);
915 if (dev
->class == ATA_DEV_ATA
) {
916 tf
.command
= ATA_CMD_ID_ATA
;
917 DPRINTK("do ATA identify\n");
919 tf
.command
= ATA_CMD_ID_ATAPI
;
920 DPRINTK("do ATAPI identify\n");
923 tf
.protocol
= ATA_PROT_PIO
;
925 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
926 dev
->id
, sizeof(dev
->id
));
929 if (err_mask
& ~AC_ERR_DEV
)
933 * arg! EDD works for all test cases, but seems to return
934 * the ATA signature for some ATAPI devices. Until the
935 * reason for this is found and fixed, we fix up the mess
936 * here. If IDENTIFY DEVICE returns command aborted
937 * (as ATAPI devices do), then we issue an
938 * IDENTIFY PACKET DEVICE.
940 * ATA software reset (SRST, the default) does not appear
941 * to have this problem.
943 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
945 if (err
& ATA_ABORTED
) {
946 dev
->class = ATA_DEV_ATAPI
;
953 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
955 /* print device capabilities */
956 printk(KERN_DEBUG
"ata%u: dev %u cfg "
957 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
958 ap
->id
, device
, dev
->id
[49],
959 dev
->id
[82], dev
->id
[83], dev
->id
[84],
960 dev
->id
[85], dev
->id
[86], dev
->id
[87],
964 * common ATA, ATAPI feature tests
967 /* we require DMA support (bits 8 of word 49) */
968 if (!ata_id_has_dma(dev
->id
)) {
969 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
973 /* quick-n-dirty find max transfer mode; for printk only */
974 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
976 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
978 xfer_modes
= ata_pio_modes(dev
);
982 /* ATA-specific feature tests */
983 if (dev
->class == ATA_DEV_ATA
) {
984 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
987 /* get major version */
988 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
989 for (major_version
= 14; major_version
>= 1; major_version
--)
990 if (tmp
& (1 << major_version
))
994 * The exact sequence expected by certain pre-ATA4 drives is:
997 * INITIALIZE DEVICE PARAMETERS
999 * Some drives were very specific about that exact sequence.
1001 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1002 ata_dev_init_params(ap
, dev
);
1004 /* current CHS translation info (id[53-58]) might be
1005 * changed. reread the identify device info.
1007 ata_dev_reread_id(ap
, dev
);
1010 if (ata_id_has_lba(dev
->id
)) {
1011 dev
->flags
|= ATA_DFLAG_LBA
;
1013 if (ata_id_has_lba48(dev
->id
)) {
1014 dev
->flags
|= ATA_DFLAG_LBA48
;
1015 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1017 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1020 /* print device info to dmesg */
1021 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1024 ata_mode_string(xfer_modes
),
1025 (unsigned long long)dev
->n_sectors
,
1026 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1030 /* Default translation */
1031 dev
->cylinders
= dev
->id
[1];
1032 dev
->heads
= dev
->id
[3];
1033 dev
->sectors
= dev
->id
[6];
1034 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1036 if (ata_id_current_chs_valid(dev
->id
)) {
1037 /* Current CHS translation is valid. */
1038 dev
->cylinders
= dev
->id
[54];
1039 dev
->heads
= dev
->id
[55];
1040 dev
->sectors
= dev
->id
[56];
1042 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1045 /* print device info to dmesg */
1046 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1049 ata_mode_string(xfer_modes
),
1050 (unsigned long long)dev
->n_sectors
,
1051 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1055 ap
->host
->max_cmd_len
= 16;
1058 /* ATAPI-specific feature tests */
1059 else if (dev
->class == ATA_DEV_ATAPI
) {
1060 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1063 rc
= atapi_cdb_len(dev
->id
);
1064 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1065 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1068 ap
->cdb_len
= (unsigned int) rc
;
1069 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1071 /* print device info to dmesg */
1072 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1074 ata_mode_string(xfer_modes
));
1077 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1081 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1084 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1085 DPRINTK("EXIT, err\n");
1089 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1091 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1095 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1102 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1104 /* limit bridge transfers to udma5, 200 sectors */
1105 if (ata_dev_knobble(ap
)) {
1106 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1107 ap
->id
, ap
->device
->devno
);
1108 ap
->udma_mask
&= ATA_UDMA5
;
1109 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1110 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1111 ap
->device
[i
].flags
|= ATA_DFLAG_LOCK_SECTORS
;
1114 if (ap
->ops
->dev_config
)
1115 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1119 * ata_bus_probe - Reset and probe ATA bus
1122 * Master ATA bus probing function. Initiates a hardware-dependent
1123 * bus reset, then attempts to identify any devices found on
1127 * PCI/etc. bus probe sem.
1130 * Zero on success, non-zero on error.
1133 static int ata_bus_probe(struct ata_port
*ap
)
1135 unsigned int i
, found
= 0;
1137 if (ap
->ops
->probe_reset
) {
1138 unsigned int classes
[ATA_MAX_DEVICES
];
1143 rc
= ap
->ops
->probe_reset(ap
, classes
);
1145 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1146 ap
->device
[i
].class = classes
[i
];
1148 printk(KERN_ERR
"ata%u: probe reset failed, "
1149 "disabling port\n", ap
->id
);
1150 ata_port_disable(ap
);
1153 ap
->ops
->phy_reset(ap
);
1155 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1158 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1159 ata_dev_identify(ap
, i
);
1160 if (ata_dev_present(&ap
->device
[i
])) {
1162 ata_dev_config(ap
,i
);
1166 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1167 goto err_out_disable
;
1170 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1171 goto err_out_disable
;
1176 ap
->ops
->port_disable(ap
);
1182 * ata_port_probe - Mark port as enabled
1183 * @ap: Port for which we indicate enablement
1185 * Modify @ap data structure such that the system
1186 * thinks that the entire port is enabled.
1188 * LOCKING: host_set lock, or some other form of
1192 void ata_port_probe(struct ata_port
*ap
)
1194 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1198 * sata_print_link_status - Print SATA link status
1199 * @ap: SATA port to printk link status about
1201 * This function prints link speed and status of a SATA link.
1206 static void sata_print_link_status(struct ata_port
*ap
)
1211 if (!ap
->ops
->scr_read
)
1214 sstatus
= scr_read(ap
, SCR_STATUS
);
1216 if (sata_dev_present(ap
)) {
1217 tmp
= (sstatus
>> 4) & 0xf;
1220 else if (tmp
& (1 << 1))
1223 speed
= "<unknown>";
1224 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1225 ap
->id
, speed
, sstatus
);
1227 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1233 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1234 * @ap: SATA port associated with target SATA PHY.
1236 * This function issues commands to standard SATA Sxxx
1237 * PHY registers, to wake up the phy (and device), and
1238 * clear any reset condition.
1241 * PCI/etc. bus probe sem.
1244 void __sata_phy_reset(struct ata_port
*ap
)
1247 unsigned long timeout
= jiffies
+ (HZ
* 5);
1249 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1250 /* issue phy wake/reset */
1251 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1252 /* Couldn't find anything in SATA I/II specs, but
1253 * AHCI-1.1 10.4.2 says at least 1 ms. */
1256 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1258 /* wait for phy to become ready, if necessary */
1261 sstatus
= scr_read(ap
, SCR_STATUS
);
1262 if ((sstatus
& 0xf) != 1)
1264 } while (time_before(jiffies
, timeout
));
1266 /* print link status */
1267 sata_print_link_status(ap
);
1269 /* TODO: phy layer with polling, timeouts, etc. */
1270 if (sata_dev_present(ap
))
1273 ata_port_disable(ap
);
1275 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1278 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1279 ata_port_disable(ap
);
1283 ap
->cbl
= ATA_CBL_SATA
;
1287 * sata_phy_reset - Reset SATA bus.
1288 * @ap: SATA port associated with target SATA PHY.
1290 * This function resets the SATA bus, and then probes
1291 * the bus for devices.
1294 * PCI/etc. bus probe sem.
1297 void sata_phy_reset(struct ata_port
*ap
)
1299 __sata_phy_reset(ap
);
1300 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1306 * ata_port_disable - Disable port.
1307 * @ap: Port to be disabled.
1309 * Modify @ap data structure such that the system
1310 * thinks that the entire port is disabled, and should
1311 * never attempt to probe or communicate with devices
1314 * LOCKING: host_set lock, or some other form of
1318 void ata_port_disable(struct ata_port
*ap
)
1320 ap
->device
[0].class = ATA_DEV_NONE
;
1321 ap
->device
[1].class = ATA_DEV_NONE
;
1322 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1326 * This mode timing computation functionality is ported over from
1327 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1330 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1331 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1332 * for PIO 5, which is a nonstandard extension and UDMA6, which
1333 * is currently supported only by Maxtor drives.
1336 static const struct ata_timing ata_timing
[] = {
1338 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1339 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1340 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1341 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1343 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1344 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1345 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1347 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1349 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1350 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1351 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1353 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1354 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1355 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1357 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1358 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1359 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1361 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1362 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1363 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1365 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1370 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1371 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1373 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1375 q
->setup
= EZ(t
->setup
* 1000, T
);
1376 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1377 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1378 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1379 q
->active
= EZ(t
->active
* 1000, T
);
1380 q
->recover
= EZ(t
->recover
* 1000, T
);
1381 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1382 q
->udma
= EZ(t
->udma
* 1000, UT
);
1385 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1386 struct ata_timing
*m
, unsigned int what
)
1388 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1389 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1390 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1391 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1392 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1393 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1394 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1395 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1398 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1400 const struct ata_timing
*t
;
1402 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1403 if (t
->mode
== 0xFF)
1408 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1409 struct ata_timing
*t
, int T
, int UT
)
1411 const struct ata_timing
*s
;
1412 struct ata_timing p
;
1418 if (!(s
= ata_timing_find_mode(speed
)))
1421 memcpy(t
, s
, sizeof(*s
));
1424 * If the drive is an EIDE drive, it can tell us it needs extended
1425 * PIO/MW_DMA cycle timing.
1428 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1429 memset(&p
, 0, sizeof(p
));
1430 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1431 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1432 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1433 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1434 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1436 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1440 * Convert the timing to bus clock counts.
1443 ata_timing_quantize(t
, t
, T
, UT
);
1446 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1447 * S.M.A.R.T * and some other commands. We have to ensure that the
1448 * DMA cycle timing is slower/equal than the fastest PIO timing.
1451 if (speed
> XFER_PIO_4
) {
1452 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1453 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1457 * Lengthen active & recovery time so that cycle time is correct.
1460 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1461 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1462 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1465 if (t
->active
+ t
->recover
< t
->cycle
) {
1466 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1467 t
->recover
= t
->cycle
- t
->active
;
1473 static const struct {
1476 } xfer_mode_classes
[] = {
1477 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1478 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1479 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1482 static u8
base_from_shift(unsigned int shift
)
1486 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1487 if (xfer_mode_classes
[i
].shift
== shift
)
1488 return xfer_mode_classes
[i
].base
;
1493 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1498 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1501 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1502 dev
->flags
|= ATA_DFLAG_PIO
;
1504 ata_dev_set_xfermode(ap
, dev
);
1506 base
= base_from_shift(dev
->xfer_shift
);
1507 ofs
= dev
->xfer_mode
- base
;
1508 idx
= ofs
+ dev
->xfer_shift
;
1509 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1511 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1512 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1514 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1515 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1518 static int ata_host_set_pio(struct ata_port
*ap
)
1524 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1527 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1531 base
= base_from_shift(ATA_SHIFT_PIO
);
1532 xfer_mode
= base
+ x
;
1534 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1535 (int)base
, (int)xfer_mode
, mask
, x
);
1537 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1538 struct ata_device
*dev
= &ap
->device
[i
];
1539 if (ata_dev_present(dev
)) {
1540 dev
->pio_mode
= xfer_mode
;
1541 dev
->xfer_mode
= xfer_mode
;
1542 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1543 if (ap
->ops
->set_piomode
)
1544 ap
->ops
->set_piomode(ap
, dev
);
1551 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1552 unsigned int xfer_shift
)
1556 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1557 struct ata_device
*dev
= &ap
->device
[i
];
1558 if (ata_dev_present(dev
)) {
1559 dev
->dma_mode
= xfer_mode
;
1560 dev
->xfer_mode
= xfer_mode
;
1561 dev
->xfer_shift
= xfer_shift
;
1562 if (ap
->ops
->set_dmamode
)
1563 ap
->ops
->set_dmamode(ap
, dev
);
1569 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1570 * @ap: port on which timings will be programmed
1572 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1575 * PCI/etc. bus probe sem.
1577 static void ata_set_mode(struct ata_port
*ap
)
1579 unsigned int xfer_shift
;
1583 /* step 1: always set host PIO timings */
1584 rc
= ata_host_set_pio(ap
);
1588 /* step 2: choose the best data xfer mode */
1589 xfer_mode
= xfer_shift
= 0;
1590 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1594 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1595 if (xfer_shift
!= ATA_SHIFT_PIO
)
1596 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1598 /* step 4: update devices' xfer mode */
1599 ata_dev_set_mode(ap
, &ap
->device
[0]);
1600 ata_dev_set_mode(ap
, &ap
->device
[1]);
1602 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1605 if (ap
->ops
->post_set_mode
)
1606 ap
->ops
->post_set_mode(ap
);
1611 ata_port_disable(ap
);
1615 * ata_tf_to_host - issue ATA taskfile to host controller
1616 * @ap: port to which command is being issued
1617 * @tf: ATA taskfile register set
1619 * Issues ATA taskfile register set to ATA host controller,
1620 * with proper synchronization with interrupt handler and
1624 * spin_lock_irqsave(host_set lock)
1627 static inline void ata_tf_to_host(struct ata_port
*ap
,
1628 const struct ata_taskfile
*tf
)
1630 ap
->ops
->tf_load(ap
, tf
);
1631 ap
->ops
->exec_command(ap
, tf
);
1635 * ata_busy_sleep - sleep until BSY clears, or timeout
1636 * @ap: port containing status register to be polled
1637 * @tmout_pat: impatience timeout
1638 * @tmout: overall timeout
1640 * Sleep until ATA Status register bit BSY clears,
1641 * or a timeout occurs.
1646 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1647 unsigned long tmout_pat
, unsigned long tmout
)
1649 unsigned long timer_start
, timeout
;
1652 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1653 timer_start
= jiffies
;
1654 timeout
= timer_start
+ tmout_pat
;
1655 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1657 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1660 if (status
& ATA_BUSY
)
1661 printk(KERN_WARNING
"ata%u is slow to respond, "
1662 "please be patient\n", ap
->id
);
1664 timeout
= timer_start
+ tmout
;
1665 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1667 status
= ata_chk_status(ap
);
1670 if (status
& ATA_BUSY
) {
1671 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1672 ap
->id
, tmout
/ HZ
);
1679 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1681 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1682 unsigned int dev0
= devmask
& (1 << 0);
1683 unsigned int dev1
= devmask
& (1 << 1);
1684 unsigned long timeout
;
1686 /* if device 0 was found in ata_devchk, wait for its
1690 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1692 /* if device 1 was found in ata_devchk, wait for
1693 * register access, then wait for BSY to clear
1695 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1699 ap
->ops
->dev_select(ap
, 1);
1700 if (ap
->flags
& ATA_FLAG_MMIO
) {
1701 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1702 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1704 nsect
= inb(ioaddr
->nsect_addr
);
1705 lbal
= inb(ioaddr
->lbal_addr
);
1707 if ((nsect
== 1) && (lbal
== 1))
1709 if (time_after(jiffies
, timeout
)) {
1713 msleep(50); /* give drive a breather */
1716 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1718 /* is all this really necessary? */
1719 ap
->ops
->dev_select(ap
, 0);
1721 ap
->ops
->dev_select(ap
, 1);
1723 ap
->ops
->dev_select(ap
, 0);
1727 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1728 * @ap: Port to reset and probe
1730 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1731 * probe the bus. Not often used these days.
1734 * PCI/etc. bus probe sem.
1735 * Obtains host_set lock.
1739 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1741 struct ata_taskfile tf
;
1742 unsigned long flags
;
1744 /* set up execute-device-diag (bus reset) taskfile */
1745 /* also, take interrupts to a known state (disabled) */
1746 DPRINTK("execute-device-diag\n");
1747 ata_tf_init(ap
, &tf
, 0);
1749 tf
.command
= ATA_CMD_EDD
;
1750 tf
.protocol
= ATA_PROT_NODATA
;
1753 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1754 ata_tf_to_host(ap
, &tf
);
1755 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1757 /* spec says at least 2ms. but who knows with those
1758 * crazy ATAPI devices...
1762 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1765 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1766 unsigned int devmask
)
1768 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1770 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1772 /* software reset. causes dev0 to be selected */
1773 if (ap
->flags
& ATA_FLAG_MMIO
) {
1774 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1775 udelay(20); /* FIXME: flush */
1776 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1777 udelay(20); /* FIXME: flush */
1778 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1780 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1782 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1784 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1787 /* spec mandates ">= 2ms" before checking status.
1788 * We wait 150ms, because that was the magic delay used for
1789 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1790 * between when the ATA command register is written, and then
1791 * status is checked. Because waiting for "a while" before
1792 * checking status is fine, post SRST, we perform this magic
1793 * delay here as well.
1797 ata_bus_post_reset(ap
, devmask
);
1803 * ata_bus_reset - reset host port and associated ATA channel
1804 * @ap: port to reset
1806 * This is typically the first time we actually start issuing
1807 * commands to the ATA channel. We wait for BSY to clear, then
1808 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1809 * result. Determine what devices, if any, are on the channel
1810 * by looking at the device 0/1 error register. Look at the signature
1811 * stored in each device's taskfile registers, to determine if
1812 * the device is ATA or ATAPI.
1815 * PCI/etc. bus probe sem.
1816 * Obtains host_set lock.
1819 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1822 void ata_bus_reset(struct ata_port
*ap
)
1824 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1825 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1827 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1829 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1831 /* determine if device 0/1 are present */
1832 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1835 dev0
= ata_devchk(ap
, 0);
1837 dev1
= ata_devchk(ap
, 1);
1841 devmask
|= (1 << 0);
1843 devmask
|= (1 << 1);
1845 /* select device 0 again */
1846 ap
->ops
->dev_select(ap
, 0);
1848 /* issue bus reset */
1849 if (ap
->flags
& ATA_FLAG_SRST
)
1850 rc
= ata_bus_softreset(ap
, devmask
);
1851 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1852 /* set up device control */
1853 if (ap
->flags
& ATA_FLAG_MMIO
)
1854 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1856 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1857 rc
= ata_bus_edd(ap
);
1864 * determine by signature whether we have ATA or ATAPI devices
1866 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1867 if ((slave_possible
) && (err
!= 0x81))
1868 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1870 /* re-enable interrupts */
1871 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1874 /* is double-select really necessary? */
1875 if (ap
->device
[1].class != ATA_DEV_NONE
)
1876 ap
->ops
->dev_select(ap
, 1);
1877 if (ap
->device
[0].class != ATA_DEV_NONE
)
1878 ap
->ops
->dev_select(ap
, 0);
1880 /* if no devices were detected, disable this port */
1881 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1882 (ap
->device
[1].class == ATA_DEV_NONE
))
1885 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
1886 /* set up device control for ATA_FLAG_SATA_RESET */
1887 if (ap
->flags
& ATA_FLAG_MMIO
)
1888 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1890 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1897 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
1898 ap
->ops
->port_disable(ap
);
1903 static int sata_phy_resume(struct ata_port
*ap
)
1905 unsigned long timeout
= jiffies
+ (HZ
* 5);
1908 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1910 /* Wait for phy to become ready, if necessary. */
1913 sstatus
= scr_read(ap
, SCR_STATUS
);
1914 if ((sstatus
& 0xf) != 1)
1916 } while (time_before(jiffies
, timeout
));
1922 * ata_std_probeinit - initialize probing
1923 * @ap: port to be probed
1925 * @ap is about to be probed. Initialize it. This function is
1926 * to be used as standard callback for ata_drive_probe_reset().
1928 * NOTE!!! Do not use this function as probeinit if a low level
1929 * driver implements only hardreset. Just pass NULL as probeinit
1930 * in that case. Using this function is probably okay but doing
1931 * so makes reset sequence different from the original
1932 * ->phy_reset implementation and Jeff nervous. :-P
1934 extern void ata_std_probeinit(struct ata_port
*ap
)
1936 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
1937 sata_phy_resume(ap
);
1938 if (sata_dev_present(ap
))
1939 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1944 * ata_std_softreset - reset host port via ATA SRST
1945 * @ap: port to reset
1946 * @verbose: fail verbosely
1947 * @classes: resulting classes of attached devices
1949 * Reset host port using ATA SRST. This function is to be used
1950 * as standard callback for ata_drive_*_reset() functions.
1953 * Kernel thread context (may sleep)
1956 * 0 on success, -errno otherwise.
1958 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
1960 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1961 unsigned int devmask
= 0, err_mask
;
1966 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
1967 classes
[0] = ATA_DEV_NONE
;
1971 /* determine if device 0/1 are present */
1972 if (ata_devchk(ap
, 0))
1973 devmask
|= (1 << 0);
1974 if (slave_possible
&& ata_devchk(ap
, 1))
1975 devmask
|= (1 << 1);
1977 /* select device 0 again */
1978 ap
->ops
->dev_select(ap
, 0);
1980 /* issue bus reset */
1981 DPRINTK("about to softreset, devmask=%x\n", devmask
);
1982 err_mask
= ata_bus_softreset(ap
, devmask
);
1985 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
1988 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
1993 /* determine by signature whether we have ATA or ATAPI devices */
1994 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
1995 if (slave_possible
&& err
!= 0x81)
1996 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
1999 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2004 * sata_std_hardreset - reset host port via SATA phy reset
2005 * @ap: port to reset
2006 * @verbose: fail verbosely
2007 * @class: resulting class of attached device
2009 * SATA phy-reset host port using DET bits of SControl register.
2010 * This function is to be used as standard callback for
2011 * ata_drive_*_reset().
2014 * Kernel thread context (may sleep)
2017 * 0 on success, -errno otherwise.
2019 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2023 /* Issue phy wake/reset */
2024 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2027 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2028 * 10.4.2 says at least 1 ms.
2032 /* Bring phy back */
2033 sata_phy_resume(ap
);
2035 /* TODO: phy layer with polling, timeouts, etc. */
2036 if (!sata_dev_present(ap
)) {
2037 *class = ATA_DEV_NONE
;
2038 DPRINTK("EXIT, link offline\n");
2042 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2044 printk(KERN_ERR
"ata%u: COMRESET failed "
2045 "(device not ready)\n", ap
->id
);
2047 DPRINTK("EXIT, device not ready\n");
2051 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2053 *class = ata_dev_try_classify(ap
, 0, NULL
);
2055 DPRINTK("EXIT, class=%u\n", *class);
2060 * ata_std_postreset - standard postreset callback
2061 * @ap: the target ata_port
2062 * @classes: classes of attached devices
2064 * This function is invoked after a successful reset. Note that
2065 * the device might have been reset more than once using
2066 * different reset methods before postreset is invoked.
2067 * postreset is also reponsible for setting cable type.
2069 * This function is to be used as standard callback for
2070 * ata_drive_*_reset().
2073 * Kernel thread context (may sleep)
2075 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2079 /* set cable type */
2080 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2081 ap
->cbl
= ATA_CBL_SATA
;
2083 /* print link status */
2084 if (ap
->cbl
== ATA_CBL_SATA
)
2085 sata_print_link_status(ap
);
2087 /* re-enable interrupts */
2088 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2091 /* is double-select really necessary? */
2092 if (classes
[0] != ATA_DEV_NONE
)
2093 ap
->ops
->dev_select(ap
, 1);
2094 if (classes
[1] != ATA_DEV_NONE
)
2095 ap
->ops
->dev_select(ap
, 0);
2097 /* bail out if no device is present */
2098 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2099 DPRINTK("EXIT, no device\n");
2103 /* set up device control */
2104 if (ap
->ioaddr
.ctl_addr
) {
2105 if (ap
->flags
& ATA_FLAG_MMIO
)
2106 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2108 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2115 * ata_std_probe_reset - standard probe reset method
2116 * @ap: prot to perform probe-reset
2117 * @classes: resulting classes of attached devices
2119 * The stock off-the-shelf ->probe_reset method.
2122 * Kernel thread context (may sleep)
2125 * 0 on success, -errno otherwise.
2127 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2129 ata_reset_fn_t hardreset
;
2132 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2133 hardreset
= sata_std_hardreset
;
2135 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2136 ata_std_softreset
, hardreset
,
2137 ata_std_postreset
, classes
);
2140 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2141 ata_postreset_fn_t postreset
,
2142 unsigned int *classes
)
2146 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2147 classes
[i
] = ATA_DEV_UNKNOWN
;
2149 rc
= reset(ap
, 0, classes
);
2153 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2154 * is complete and convert all ATA_DEV_UNKNOWN to
2157 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2158 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2161 if (i
< ATA_MAX_DEVICES
)
2162 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2163 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2164 classes
[i
] = ATA_DEV_NONE
;
2167 postreset(ap
, classes
);
2169 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2173 * ata_drive_probe_reset - Perform probe reset with given methods
2174 * @ap: port to reset
2175 * @probeinit: probeinit method (can be NULL)
2176 * @softreset: softreset method (can be NULL)
2177 * @hardreset: hardreset method (can be NULL)
2178 * @postreset: postreset method (can be NULL)
2179 * @classes: resulting classes of attached devices
2181 * Reset the specified port and classify attached devices using
2182 * given methods. This function prefers softreset but tries all
2183 * possible reset sequences to reset and classify devices. This
2184 * function is intended to be used for constructing ->probe_reset
2185 * callback by low level drivers.
2187 * Reset methods should follow the following rules.
2189 * - Return 0 on sucess, -errno on failure.
2190 * - If classification is supported, fill classes[] with
2191 * recognized class codes.
2192 * - If classification is not supported, leave classes[] alone.
2193 * - If verbose is non-zero, print error message on failure;
2194 * otherwise, shut up.
2197 * Kernel thread context (may sleep)
2200 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2201 * if classification fails, and any error code from reset
2204 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2205 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2206 ata_postreset_fn_t postreset
, unsigned int *classes
)
2214 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2222 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2223 if (rc
== 0 || rc
!= -ENODEV
)
2227 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2232 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2233 const struct ata_device
*dev
)
2235 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2236 ap
->id
, dev
->devno
);
2239 static const char * const ata_dma_blacklist
[] = {
2258 "Toshiba CD-ROM XM-6202B",
2259 "TOSHIBA CD-ROM XM-1702BC",
2261 "E-IDE CD-ROM CR-840",
2264 "SAMSUNG CD-ROM SC-148C",
2265 "SAMSUNG CD-ROM SC",
2267 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2271 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2273 unsigned char model_num
[40];
2278 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2281 len
= strnlen(s
, sizeof(model_num
));
2283 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2284 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2289 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2290 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2296 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2298 const struct ata_device
*master
, *slave
;
2301 master
= &ap
->device
[0];
2302 slave
= &ap
->device
[1];
2304 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2306 if (shift
== ATA_SHIFT_UDMA
) {
2307 mask
= ap
->udma_mask
;
2308 if (ata_dev_present(master
)) {
2309 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2310 if (ata_dma_blacklisted(master
)) {
2312 ata_pr_blacklisted(ap
, master
);
2315 if (ata_dev_present(slave
)) {
2316 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2317 if (ata_dma_blacklisted(slave
)) {
2319 ata_pr_blacklisted(ap
, slave
);
2323 else if (shift
== ATA_SHIFT_MWDMA
) {
2324 mask
= ap
->mwdma_mask
;
2325 if (ata_dev_present(master
)) {
2326 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2327 if (ata_dma_blacklisted(master
)) {
2329 ata_pr_blacklisted(ap
, master
);
2332 if (ata_dev_present(slave
)) {
2333 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2334 if (ata_dma_blacklisted(slave
)) {
2336 ata_pr_blacklisted(ap
, slave
);
2340 else if (shift
== ATA_SHIFT_PIO
) {
2341 mask
= ap
->pio_mask
;
2342 if (ata_dev_present(master
)) {
2343 /* spec doesn't return explicit support for
2344 * PIO0-2, so we fake it
2346 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2351 if (ata_dev_present(slave
)) {
2352 /* spec doesn't return explicit support for
2353 * PIO0-2, so we fake it
2355 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2362 mask
= 0xffffffff; /* shut up compiler warning */
2369 /* find greatest bit */
2370 static int fgb(u32 bitmap
)
2375 for (i
= 0; i
< 32; i
++)
2376 if (bitmap
& (1 << i
))
2383 * ata_choose_xfer_mode - attempt to find best transfer mode
2384 * @ap: Port for which an xfer mode will be selected
2385 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2386 * @xfer_shift_out: (output) bit shift that selects this mode
2388 * Based on host and device capabilities, determine the
2389 * maximum transfer mode that is amenable to all.
2392 * PCI/etc. bus probe sem.
2395 * Zero on success, negative on error.
2398 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2400 unsigned int *xfer_shift_out
)
2402 unsigned int mask
, shift
;
2405 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2406 shift
= xfer_mode_classes
[i
].shift
;
2407 mask
= ata_get_mode_mask(ap
, shift
);
2411 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2412 *xfer_shift_out
= shift
;
2421 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2422 * @ap: Port associated with device @dev
2423 * @dev: Device to which command will be sent
2425 * Issue SET FEATURES - XFER MODE command to device @dev
2429 * PCI/etc. bus probe sem.
2432 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2434 struct ata_taskfile tf
;
2436 /* set up set-features taskfile */
2437 DPRINTK("set features - xfer mode\n");
2439 ata_tf_init(ap
, &tf
, dev
->devno
);
2440 tf
.command
= ATA_CMD_SET_FEATURES
;
2441 tf
.feature
= SETFEATURES_XFER
;
2442 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2443 tf
.protocol
= ATA_PROT_NODATA
;
2444 tf
.nsect
= dev
->xfer_mode
;
2446 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2447 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2449 ata_port_disable(ap
);
2456 * ata_dev_reread_id - Reread the device identify device info
2457 * @ap: port where the device is
2458 * @dev: device to reread the identify device info
2463 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2465 struct ata_taskfile tf
;
2467 ata_tf_init(ap
, &tf
, dev
->devno
);
2469 if (dev
->class == ATA_DEV_ATA
) {
2470 tf
.command
= ATA_CMD_ID_ATA
;
2471 DPRINTK("do ATA identify\n");
2473 tf
.command
= ATA_CMD_ID_ATAPI
;
2474 DPRINTK("do ATAPI identify\n");
2477 tf
.flags
|= ATA_TFLAG_DEVICE
;
2478 tf
.protocol
= ATA_PROT_PIO
;
2480 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2481 dev
->id
, sizeof(dev
->id
)))
2484 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2492 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2493 ata_port_disable(ap
);
2497 * ata_dev_init_params - Issue INIT DEV PARAMS command
2498 * @ap: Port associated with device @dev
2499 * @dev: Device to which command will be sent
2504 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2506 struct ata_taskfile tf
;
2507 u16 sectors
= dev
->id
[6];
2508 u16 heads
= dev
->id
[3];
2510 /* Number of sectors per track 1-255. Number of heads 1-16 */
2511 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2514 /* set up init dev params taskfile */
2515 DPRINTK("init dev params \n");
2517 ata_tf_init(ap
, &tf
, dev
->devno
);
2518 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2519 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2520 tf
.protocol
= ATA_PROT_NODATA
;
2522 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2524 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2525 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2527 ata_port_disable(ap
);
2534 * ata_sg_clean - Unmap DMA memory associated with command
2535 * @qc: Command containing DMA memory to be released
2537 * Unmap all mapped DMA memory associated with this command.
2540 * spin_lock_irqsave(host_set lock)
2543 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2545 struct ata_port
*ap
= qc
->ap
;
2546 struct scatterlist
*sg
= qc
->__sg
;
2547 int dir
= qc
->dma_dir
;
2548 void *pad_buf
= NULL
;
2550 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2553 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2554 assert(qc
->n_elem
== 1);
2556 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2558 /* if we padded the buffer out to 32-bit bound, and data
2559 * xfer direction is from-device, we must copy from the
2560 * pad buffer back into the supplied buffer
2562 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2563 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2565 if (qc
->flags
& ATA_QCFLAG_SG
) {
2567 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2568 /* restore last sg */
2569 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2571 struct scatterlist
*psg
= &qc
->pad_sgent
;
2572 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2573 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2574 kunmap_atomic(addr
, KM_IRQ0
);
2577 if (sg_dma_len(&sg
[0]) > 0)
2578 dma_unmap_single(ap
->host_set
->dev
,
2579 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2582 sg
->length
+= qc
->pad_len
;
2584 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2585 pad_buf
, qc
->pad_len
);
2588 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2593 * ata_fill_sg - Fill PCI IDE PRD table
2594 * @qc: Metadata associated with taskfile to be transferred
2596 * Fill PCI IDE PRD (scatter-gather) table with segments
2597 * associated with the current disk command.
2600 * spin_lock_irqsave(host_set lock)
2603 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2605 struct ata_port
*ap
= qc
->ap
;
2606 struct scatterlist
*sg
;
2609 assert(qc
->__sg
!= NULL
);
2610 assert(qc
->n_elem
> 0);
2613 ata_for_each_sg(sg
, qc
) {
2617 /* determine if physical DMA addr spans 64K boundary.
2618 * Note h/w doesn't support 64-bit, so we unconditionally
2619 * truncate dma_addr_t to u32.
2621 addr
= (u32
) sg_dma_address(sg
);
2622 sg_len
= sg_dma_len(sg
);
2625 offset
= addr
& 0xffff;
2627 if ((offset
+ sg_len
) > 0x10000)
2628 len
= 0x10000 - offset
;
2630 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2631 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2632 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2641 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2644 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2645 * @qc: Metadata associated with taskfile to check
2647 * Allow low-level driver to filter ATA PACKET commands, returning
2648 * a status indicating whether or not it is OK to use DMA for the
2649 * supplied PACKET command.
2652 * spin_lock_irqsave(host_set lock)
2654 * RETURNS: 0 when ATAPI DMA can be used
2657 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2659 struct ata_port
*ap
= qc
->ap
;
2660 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2662 if (ap
->ops
->check_atapi_dma
)
2663 rc
= ap
->ops
->check_atapi_dma(qc
);
2668 * ata_qc_prep - Prepare taskfile for submission
2669 * @qc: Metadata associated with taskfile to be prepared
2671 * Prepare ATA taskfile for submission.
2674 * spin_lock_irqsave(host_set lock)
2676 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2678 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2685 * ata_sg_init_one - Associate command with memory buffer
2686 * @qc: Command to be associated
2687 * @buf: Memory buffer
2688 * @buflen: Length of memory buffer, in bytes.
2690 * Initialize the data-related elements of queued_cmd @qc
2691 * to point to a single memory buffer, @buf of byte length @buflen.
2694 * spin_lock_irqsave(host_set lock)
2697 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2699 struct scatterlist
*sg
;
2701 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2703 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2704 qc
->__sg
= &qc
->sgent
;
2706 qc
->orig_n_elem
= 1;
2710 sg_init_one(sg
, buf
, buflen
);
2714 * ata_sg_init - Associate command with scatter-gather table.
2715 * @qc: Command to be associated
2716 * @sg: Scatter-gather table.
2717 * @n_elem: Number of elements in s/g table.
2719 * Initialize the data-related elements of queued_cmd @qc
2720 * to point to a scatter-gather table @sg, containing @n_elem
2724 * spin_lock_irqsave(host_set lock)
2727 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2728 unsigned int n_elem
)
2730 qc
->flags
|= ATA_QCFLAG_SG
;
2732 qc
->n_elem
= n_elem
;
2733 qc
->orig_n_elem
= n_elem
;
2737 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2738 * @qc: Command with memory buffer to be mapped.
2740 * DMA-map the memory buffer associated with queued_cmd @qc.
2743 * spin_lock_irqsave(host_set lock)
2746 * Zero on success, negative on error.
2749 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2751 struct ata_port
*ap
= qc
->ap
;
2752 int dir
= qc
->dma_dir
;
2753 struct scatterlist
*sg
= qc
->__sg
;
2754 dma_addr_t dma_address
;
2756 /* we must lengthen transfers to end on a 32-bit boundary */
2757 qc
->pad_len
= sg
->length
& 3;
2759 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2760 struct scatterlist
*psg
= &qc
->pad_sgent
;
2762 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2764 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2766 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2767 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2770 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2771 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2773 sg
->length
-= qc
->pad_len
;
2775 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2776 sg
->length
, qc
->pad_len
);
2780 sg_dma_address(sg
) = 0;
2784 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2786 if (dma_mapping_error(dma_address
)) {
2788 sg
->length
+= qc
->pad_len
;
2792 sg_dma_address(sg
) = dma_address
;
2794 sg_dma_len(sg
) = sg
->length
;
2796 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2797 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2803 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2804 * @qc: Command with scatter-gather table to be mapped.
2806 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2809 * spin_lock_irqsave(host_set lock)
2812 * Zero on success, negative on error.
2816 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2818 struct ata_port
*ap
= qc
->ap
;
2819 struct scatterlist
*sg
= qc
->__sg
;
2820 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2821 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2823 VPRINTK("ENTER, ata%u\n", ap
->id
);
2824 assert(qc
->flags
& ATA_QCFLAG_SG
);
2826 /* we must lengthen transfers to end on a 32-bit boundary */
2827 qc
->pad_len
= lsg
->length
& 3;
2829 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2830 struct scatterlist
*psg
= &qc
->pad_sgent
;
2831 unsigned int offset
;
2833 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2835 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2838 * psg->page/offset are used to copy to-be-written
2839 * data in this function or read data in ata_sg_clean.
2841 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2842 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2843 psg
->offset
= offset_in_page(offset
);
2845 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2846 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2847 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2848 kunmap_atomic(addr
, KM_IRQ0
);
2851 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2852 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2854 lsg
->length
-= qc
->pad_len
;
2855 if (lsg
->length
== 0)
2858 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2859 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2862 pre_n_elem
= qc
->n_elem
;
2863 if (trim_sg
&& pre_n_elem
)
2872 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2874 /* restore last sg */
2875 lsg
->length
+= qc
->pad_len
;
2879 DPRINTK("%d sg elements mapped\n", n_elem
);
2882 qc
->n_elem
= n_elem
;
2888 * ata_poll_qc_complete - turn irq back on and finish qc
2889 * @qc: Command to complete
2890 * @err_mask: ATA status register content
2893 * None. (grabs host lock)
2896 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2898 struct ata_port
*ap
= qc
->ap
;
2899 unsigned long flags
;
2901 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2902 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2904 ata_qc_complete(qc
);
2905 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2909 * ata_pio_poll - poll using PIO, depending on current state
2910 * @ap: the target ata_port
2913 * None. (executing in kernel thread context)
2916 * timeout value to use
2919 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2921 struct ata_queued_cmd
*qc
;
2923 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2924 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2926 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2929 switch (ap
->hsm_task_state
) {
2932 poll_state
= HSM_ST_POLL
;
2936 case HSM_ST_LAST_POLL
:
2937 poll_state
= HSM_ST_LAST_POLL
;
2938 reg_state
= HSM_ST_LAST
;
2945 status
= ata_chk_status(ap
);
2946 if (status
& ATA_BUSY
) {
2947 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2948 qc
->err_mask
|= AC_ERR_TIMEOUT
;
2949 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2952 ap
->hsm_task_state
= poll_state
;
2953 return ATA_SHORT_PAUSE
;
2956 ap
->hsm_task_state
= reg_state
;
2961 * ata_pio_complete - check if drive is busy or idle
2962 * @ap: the target ata_port
2965 * None. (executing in kernel thread context)
2968 * Non-zero if qc completed, zero otherwise.
2971 static int ata_pio_complete (struct ata_port
*ap
)
2973 struct ata_queued_cmd
*qc
;
2977 * This is purely heuristic. This is a fast path. Sometimes when
2978 * we enter, BSY will be cleared in a chk-status or two. If not,
2979 * the drive is probably seeking or something. Snooze for a couple
2980 * msecs, then chk-status again. If still busy, fall back to
2981 * HSM_ST_POLL state.
2983 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2984 if (drv_stat
& ATA_BUSY
) {
2986 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2987 if (drv_stat
& ATA_BUSY
) {
2988 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2989 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2994 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2997 drv_stat
= ata_wait_idle(ap
);
2998 if (!ata_ok(drv_stat
)) {
2999 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3000 ap
->hsm_task_state
= HSM_ST_ERR
;
3004 ap
->hsm_task_state
= HSM_ST_IDLE
;
3006 assert(qc
->err_mask
== 0);
3007 ata_poll_qc_complete(qc
);
3009 /* another command may start at this point */
3016 * swap_buf_le16 - swap halves of 16-bit words in place
3017 * @buf: Buffer to swap
3018 * @buf_words: Number of 16-bit words in buffer.
3020 * Swap halves of 16-bit words if needed to convert from
3021 * little-endian byte order to native cpu byte order, or
3025 * Inherited from caller.
3027 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3032 for (i
= 0; i
< buf_words
; i
++)
3033 buf
[i
] = le16_to_cpu(buf
[i
]);
3034 #endif /* __BIG_ENDIAN */
3038 * ata_mmio_data_xfer - Transfer data by MMIO
3039 * @ap: port to read/write
3041 * @buflen: buffer length
3042 * @write_data: read/write
3044 * Transfer data from/to the device data register by MMIO.
3047 * Inherited from caller.
3050 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3051 unsigned int buflen
, int write_data
)
3054 unsigned int words
= buflen
>> 1;
3055 u16
*buf16
= (u16
*) buf
;
3056 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3058 /* Transfer multiple of 2 bytes */
3060 for (i
= 0; i
< words
; i
++)
3061 writew(le16_to_cpu(buf16
[i
]), mmio
);
3063 for (i
= 0; i
< words
; i
++)
3064 buf16
[i
] = cpu_to_le16(readw(mmio
));
3067 /* Transfer trailing 1 byte, if any. */
3068 if (unlikely(buflen
& 0x01)) {
3069 u16 align_buf
[1] = { 0 };
3070 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3073 memcpy(align_buf
, trailing_buf
, 1);
3074 writew(le16_to_cpu(align_buf
[0]), mmio
);
3076 align_buf
[0] = cpu_to_le16(readw(mmio
));
3077 memcpy(trailing_buf
, align_buf
, 1);
3083 * ata_pio_data_xfer - Transfer data by PIO
3084 * @ap: port to read/write
3086 * @buflen: buffer length
3087 * @write_data: read/write
3089 * Transfer data from/to the device data register by PIO.
3092 * Inherited from caller.
3095 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3096 unsigned int buflen
, int write_data
)
3098 unsigned int words
= buflen
>> 1;
3100 /* Transfer multiple of 2 bytes */
3102 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3104 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3106 /* Transfer trailing 1 byte, if any. */
3107 if (unlikely(buflen
& 0x01)) {
3108 u16 align_buf
[1] = { 0 };
3109 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3112 memcpy(align_buf
, trailing_buf
, 1);
3113 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3115 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3116 memcpy(trailing_buf
, align_buf
, 1);
3122 * ata_data_xfer - Transfer data from/to the data register.
3123 * @ap: port to read/write
3125 * @buflen: buffer length
3126 * @do_write: read/write
3128 * Transfer data from/to the device data register.
3131 * Inherited from caller.
3134 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3135 unsigned int buflen
, int do_write
)
3137 /* Make the crap hardware pay the costs not the good stuff */
3138 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3139 unsigned long flags
;
3140 local_irq_save(flags
);
3141 if (ap
->flags
& ATA_FLAG_MMIO
)
3142 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3144 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3145 local_irq_restore(flags
);
3147 if (ap
->flags
& ATA_FLAG_MMIO
)
3148 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3150 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3155 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3156 * @qc: Command on going
3158 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3161 * Inherited from caller.
3164 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3166 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3167 struct scatterlist
*sg
= qc
->__sg
;
3168 struct ata_port
*ap
= qc
->ap
;
3170 unsigned int offset
;
3173 if (qc
->cursect
== (qc
->nsect
- 1))
3174 ap
->hsm_task_state
= HSM_ST_LAST
;
3176 page
= sg
[qc
->cursg
].page
;
3177 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3179 /* get the current page and offset */
3180 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3181 offset
%= PAGE_SIZE
;
3183 buf
= kmap(page
) + offset
;
3188 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3193 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3195 /* do the actual data transfer */
3196 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3197 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3203 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3204 * @qc: Command on going
3205 * @bytes: number of bytes
3207 * Transfer Transfer data from/to the ATAPI device.
3210 * Inherited from caller.
3214 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3216 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3217 struct scatterlist
*sg
= qc
->__sg
;
3218 struct ata_port
*ap
= qc
->ap
;
3221 unsigned int offset
, count
;
3223 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3224 ap
->hsm_task_state
= HSM_ST_LAST
;
3227 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3229 * The end of qc->sg is reached and the device expects
3230 * more data to transfer. In order not to overrun qc->sg
3231 * and fulfill length specified in the byte count register,
3232 * - for read case, discard trailing data from the device
3233 * - for write case, padding zero data to the device
3235 u16 pad_buf
[1] = { 0 };
3236 unsigned int words
= bytes
>> 1;
3239 if (words
) /* warning if bytes > 1 */
3240 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3243 for (i
= 0; i
< words
; i
++)
3244 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3246 ap
->hsm_task_state
= HSM_ST_LAST
;
3250 sg
= &qc
->__sg
[qc
->cursg
];
3253 offset
= sg
->offset
+ qc
->cursg_ofs
;
3255 /* get the current page and offset */
3256 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3257 offset
%= PAGE_SIZE
;
3259 /* don't overrun current sg */
3260 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3262 /* don't cross page boundaries */
3263 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3265 buf
= kmap(page
) + offset
;
3268 qc
->curbytes
+= count
;
3269 qc
->cursg_ofs
+= count
;
3271 if (qc
->cursg_ofs
== sg
->length
) {
3276 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3278 /* do the actual data transfer */
3279 ata_data_xfer(ap
, buf
, count
, do_write
);
3288 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3289 * @qc: Command on going
3291 * Transfer Transfer data from/to the ATAPI device.
3294 * Inherited from caller.
3297 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3299 struct ata_port
*ap
= qc
->ap
;
3300 struct ata_device
*dev
= qc
->dev
;
3301 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3302 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3304 ap
->ops
->tf_read(ap
, &qc
->tf
);
3305 ireason
= qc
->tf
.nsect
;
3306 bc_lo
= qc
->tf
.lbam
;
3307 bc_hi
= qc
->tf
.lbah
;
3308 bytes
= (bc_hi
<< 8) | bc_lo
;
3310 /* shall be cleared to zero, indicating xfer of data */
3311 if (ireason
& (1 << 0))
3314 /* make sure transfer direction matches expected */
3315 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3316 if (do_write
!= i_write
)
3319 __atapi_pio_bytes(qc
, bytes
);
3324 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3325 ap
->id
, dev
->devno
);
3326 qc
->err_mask
|= AC_ERR_HSM
;
3327 ap
->hsm_task_state
= HSM_ST_ERR
;
3331 * ata_pio_block - start PIO on a block
3332 * @ap: the target ata_port
3335 * None. (executing in kernel thread context)
3338 static void ata_pio_block(struct ata_port
*ap
)
3340 struct ata_queued_cmd
*qc
;
3344 * This is purely heuristic. This is a fast path.
3345 * Sometimes when we enter, BSY will be cleared in
3346 * a chk-status or two. If not, the drive is probably seeking
3347 * or something. Snooze for a couple msecs, then
3348 * chk-status again. If still busy, fall back to
3349 * HSM_ST_POLL state.
3351 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3352 if (status
& ATA_BUSY
) {
3354 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3355 if (status
& ATA_BUSY
) {
3356 ap
->hsm_task_state
= HSM_ST_POLL
;
3357 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3362 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3366 if (status
& (ATA_ERR
| ATA_DF
)) {
3367 qc
->err_mask
|= AC_ERR_DEV
;
3368 ap
->hsm_task_state
= HSM_ST_ERR
;
3372 /* transfer data if any */
3373 if (is_atapi_taskfile(&qc
->tf
)) {
3374 /* DRQ=0 means no more data to transfer */
3375 if ((status
& ATA_DRQ
) == 0) {
3376 ap
->hsm_task_state
= HSM_ST_LAST
;
3380 atapi_pio_bytes(qc
);
3382 /* handle BSY=0, DRQ=0 as error */
3383 if ((status
& ATA_DRQ
) == 0) {
3384 qc
->err_mask
|= AC_ERR_HSM
;
3385 ap
->hsm_task_state
= HSM_ST_ERR
;
3393 static void ata_pio_error(struct ata_port
*ap
)
3395 struct ata_queued_cmd
*qc
;
3397 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3399 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3402 /* make sure qc->err_mask is available to
3403 * know what's wrong and recover
3405 assert(qc
->err_mask
);
3407 ap
->hsm_task_state
= HSM_ST_IDLE
;
3409 ata_poll_qc_complete(qc
);
3412 static void ata_pio_task(void *_data
)
3414 struct ata_port
*ap
= _data
;
3415 unsigned long timeout
;
3422 switch (ap
->hsm_task_state
) {
3431 qc_completed
= ata_pio_complete(ap
);
3435 case HSM_ST_LAST_POLL
:
3436 timeout
= ata_pio_poll(ap
);
3446 ata_queue_delayed_pio_task(ap
, timeout
);
3447 else if (!qc_completed
)
3452 * ata_qc_timeout - Handle timeout of queued command
3453 * @qc: Command that timed out
3455 * Some part of the kernel (currently, only the SCSI layer)
3456 * has noticed that the active command on port @ap has not
3457 * completed after a specified length of time. Handle this
3458 * condition by disabling DMA (if necessary) and completing
3459 * transactions, with error if necessary.
3461 * This also handles the case of the "lost interrupt", where
3462 * for some reason (possibly hardware bug, possibly driver bug)
3463 * an interrupt was not delivered to the driver, even though the
3464 * transaction completed successfully.
3467 * Inherited from SCSI layer (none, can sleep)
3470 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3472 struct ata_port
*ap
= qc
->ap
;
3473 struct ata_host_set
*host_set
= ap
->host_set
;
3474 u8 host_stat
= 0, drv_stat
;
3475 unsigned long flags
;
3479 ata_flush_pio_tasks(ap
);
3480 ap
->hsm_task_state
= HSM_ST_IDLE
;
3482 spin_lock_irqsave(&host_set
->lock
, flags
);
3484 switch (qc
->tf
.protocol
) {
3487 case ATA_PROT_ATAPI_DMA
:
3488 host_stat
= ap
->ops
->bmdma_status(ap
);
3490 /* before we do anything else, clear DMA-Start bit */
3491 ap
->ops
->bmdma_stop(qc
);
3497 drv_stat
= ata_chk_status(ap
);
3499 /* ack bmdma irq events */
3500 ap
->ops
->irq_clear(ap
);
3502 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3503 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3505 /* complete taskfile transaction */
3506 qc
->err_mask
|= ac_err_mask(drv_stat
);
3510 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3512 ata_eh_qc_complete(qc
);
3518 * ata_eng_timeout - Handle timeout of queued command
3519 * @ap: Port on which timed-out command is active
3521 * Some part of the kernel (currently, only the SCSI layer)
3522 * has noticed that the active command on port @ap has not
3523 * completed after a specified length of time. Handle this
3524 * condition by disabling DMA (if necessary) and completing
3525 * transactions, with error if necessary.
3527 * This also handles the case of the "lost interrupt", where
3528 * for some reason (possibly hardware bug, possibly driver bug)
3529 * an interrupt was not delivered to the driver, even though the
3530 * transaction completed successfully.
3533 * Inherited from SCSI layer (none, can sleep)
3536 void ata_eng_timeout(struct ata_port
*ap
)
3540 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3546 * ata_qc_new - Request an available ATA command, for queueing
3547 * @ap: Port associated with device @dev
3548 * @dev: Device from whom we request an available command structure
3554 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3556 struct ata_queued_cmd
*qc
= NULL
;
3559 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3560 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3561 qc
= ata_qc_from_tag(ap
, i
);
3572 * ata_qc_new_init - Request an available ATA command, and initialize it
3573 * @ap: Port associated with device @dev
3574 * @dev: Device from whom we request an available command structure
3580 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3581 struct ata_device
*dev
)
3583 struct ata_queued_cmd
*qc
;
3585 qc
= ata_qc_new(ap
);
3598 * ata_qc_free - free unused ata_queued_cmd
3599 * @qc: Command to complete
3601 * Designed to free unused ata_queued_cmd object
3602 * in case something prevents using it.
3605 * spin_lock_irqsave(host_set lock)
3607 void ata_qc_free(struct ata_queued_cmd
*qc
)
3609 struct ata_port
*ap
= qc
->ap
;
3612 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3616 if (likely(ata_tag_valid(tag
))) {
3617 if (tag
== ap
->active_tag
)
3618 ap
->active_tag
= ATA_TAG_POISON
;
3619 qc
->tag
= ATA_TAG_POISON
;
3620 clear_bit(tag
, &ap
->qactive
);
3624 inline void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3626 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3627 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3629 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3632 /* atapi: mark qc as inactive to prevent the interrupt handler
3633 * from completing the command twice later, before the error handler
3634 * is called. (when rc != 0 and atapi request sense is needed)
3636 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3638 /* call completion callback */
3639 qc
->complete_fn(qc
);
3643 * ata_qc_complete - Complete an active ATA command
3644 * @qc: Command to complete
3645 * @err_mask: ATA Status register contents
3647 * Indicate to the mid and upper layers that an ATA
3648 * command has completed, with either an ok or not-ok status.
3651 * spin_lock_irqsave(host_set lock)
3653 void ata_qc_complete(struct ata_queued_cmd
*qc
)
3655 if (unlikely(qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
))
3658 __ata_qc_complete(qc
);
3661 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3663 struct ata_port
*ap
= qc
->ap
;
3665 switch (qc
->tf
.protocol
) {
3667 case ATA_PROT_ATAPI_DMA
:
3670 case ATA_PROT_ATAPI
:
3672 case ATA_PROT_PIO_MULT
:
3673 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3686 * ata_qc_issue - issue taskfile to device
3687 * @qc: command to issue to device
3689 * Prepare an ATA command to submission to device.
3690 * This includes mapping the data into a DMA-able
3691 * area, filling in the S/G table, and finally
3692 * writing the taskfile to hardware, starting the command.
3695 * spin_lock_irqsave(host_set lock)
3698 * Zero on success, AC_ERR_* mask on failure
3701 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3703 struct ata_port
*ap
= qc
->ap
;
3705 if (ata_should_dma_map(qc
)) {
3706 if (qc
->flags
& ATA_QCFLAG_SG
) {
3707 if (ata_sg_setup(qc
))
3709 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3710 if (ata_sg_setup_one(qc
))
3714 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3717 ap
->ops
->qc_prep(qc
);
3719 qc
->ap
->active_tag
= qc
->tag
;
3720 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3722 return ap
->ops
->qc_issue(qc
);
3725 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3726 return AC_ERR_SYSTEM
;
3731 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3732 * @qc: command to issue to device
3734 * Using various libata functions and hooks, this function
3735 * starts an ATA command. ATA commands are grouped into
3736 * classes called "protocols", and issuing each type of protocol
3737 * is slightly different.
3739 * May be used as the qc_issue() entry in ata_port_operations.
3742 * spin_lock_irqsave(host_set lock)
3745 * Zero on success, AC_ERR_* mask on failure
3748 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3750 struct ata_port
*ap
= qc
->ap
;
3752 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3754 switch (qc
->tf
.protocol
) {
3755 case ATA_PROT_NODATA
:
3756 ata_tf_to_host(ap
, &qc
->tf
);
3760 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3761 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3762 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3765 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3766 ata_qc_set_polling(qc
);
3767 ata_tf_to_host(ap
, &qc
->tf
);
3768 ap
->hsm_task_state
= HSM_ST
;
3769 ata_queue_pio_task(ap
);
3772 case ATA_PROT_ATAPI
:
3773 ata_qc_set_polling(qc
);
3774 ata_tf_to_host(ap
, &qc
->tf
);
3775 ata_queue_packet_task(ap
);
3778 case ATA_PROT_ATAPI_NODATA
:
3779 ap
->flags
|= ATA_FLAG_NOINTR
;
3780 ata_tf_to_host(ap
, &qc
->tf
);
3781 ata_queue_packet_task(ap
);
3784 case ATA_PROT_ATAPI_DMA
:
3785 ap
->flags
|= ATA_FLAG_NOINTR
;
3786 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3787 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3788 ata_queue_packet_task(ap
);
3793 return AC_ERR_SYSTEM
;
3800 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3801 * @qc: Info associated with this ATA transaction.
3804 * spin_lock_irqsave(host_set lock)
3807 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3809 struct ata_port
*ap
= qc
->ap
;
3810 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3812 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3814 /* load PRD table addr. */
3815 mb(); /* make sure PRD table writes are visible to controller */
3816 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3818 /* specify data direction, triple-check start bit is clear */
3819 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3820 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3822 dmactl
|= ATA_DMA_WR
;
3823 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3825 /* issue r/w command */
3826 ap
->ops
->exec_command(ap
, &qc
->tf
);
3830 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3831 * @qc: Info associated with this ATA transaction.
3834 * spin_lock_irqsave(host_set lock)
3837 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3839 struct ata_port
*ap
= qc
->ap
;
3840 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3843 /* start host DMA transaction */
3844 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3845 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3847 /* Strictly, one may wish to issue a readb() here, to
3848 * flush the mmio write. However, control also passes
3849 * to the hardware at this point, and it will interrupt
3850 * us when we are to resume control. So, in effect,
3851 * we don't care when the mmio write flushes.
3852 * Further, a read of the DMA status register _immediately_
3853 * following the write may not be what certain flaky hardware
3854 * is expected, so I think it is best to not add a readb()
3855 * without first all the MMIO ATA cards/mobos.
3856 * Or maybe I'm just being paranoid.
3861 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3862 * @qc: Info associated with this ATA transaction.
3865 * spin_lock_irqsave(host_set lock)
3868 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3870 struct ata_port
*ap
= qc
->ap
;
3871 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3874 /* load PRD table addr. */
3875 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3877 /* specify data direction, triple-check start bit is clear */
3878 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3879 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3881 dmactl
|= ATA_DMA_WR
;
3882 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3884 /* issue r/w command */
3885 ap
->ops
->exec_command(ap
, &qc
->tf
);
3889 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3890 * @qc: Info associated with this ATA transaction.
3893 * spin_lock_irqsave(host_set lock)
3896 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3898 struct ata_port
*ap
= qc
->ap
;
3901 /* start host DMA transaction */
3902 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3903 outb(dmactl
| ATA_DMA_START
,
3904 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3909 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3910 * @qc: Info associated with this ATA transaction.
3912 * Writes the ATA_DMA_START flag to the DMA command register.
3914 * May be used as the bmdma_start() entry in ata_port_operations.
3917 * spin_lock_irqsave(host_set lock)
3919 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3921 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3922 ata_bmdma_start_mmio(qc
);
3924 ata_bmdma_start_pio(qc
);
3929 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3930 * @qc: Info associated with this ATA transaction.
3932 * Writes address of PRD table to device's PRD Table Address
3933 * register, sets the DMA control register, and calls
3934 * ops->exec_command() to start the transfer.
3936 * May be used as the bmdma_setup() entry in ata_port_operations.
3939 * spin_lock_irqsave(host_set lock)
3941 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3943 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3944 ata_bmdma_setup_mmio(qc
);
3946 ata_bmdma_setup_pio(qc
);
3951 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3952 * @ap: Port associated with this ATA transaction.
3954 * Clear interrupt and error flags in DMA status register.
3956 * May be used as the irq_clear() entry in ata_port_operations.
3959 * spin_lock_irqsave(host_set lock)
3962 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3964 if (ap
->flags
& ATA_FLAG_MMIO
) {
3965 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3966 writeb(readb(mmio
), mmio
);
3968 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3969 outb(inb(addr
), addr
);
3976 * ata_bmdma_status - Read PCI IDE BMDMA status
3977 * @ap: Port associated with this ATA transaction.
3979 * Read and return BMDMA status register.
3981 * May be used as the bmdma_status() entry in ata_port_operations.
3984 * spin_lock_irqsave(host_set lock)
3987 u8
ata_bmdma_status(struct ata_port
*ap
)
3990 if (ap
->flags
& ATA_FLAG_MMIO
) {
3991 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3992 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3994 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4000 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4001 * @qc: Command we are ending DMA for
4003 * Clears the ATA_DMA_START flag in the dma control register
4005 * May be used as the bmdma_stop() entry in ata_port_operations.
4008 * spin_lock_irqsave(host_set lock)
4011 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4013 struct ata_port
*ap
= qc
->ap
;
4014 if (ap
->flags
& ATA_FLAG_MMIO
) {
4015 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4017 /* clear start/stop bit */
4018 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4019 mmio
+ ATA_DMA_CMD
);
4021 /* clear start/stop bit */
4022 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4023 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4026 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4027 ata_altstatus(ap
); /* dummy read */
4031 * ata_host_intr - Handle host interrupt for given (port, task)
4032 * @ap: Port on which interrupt arrived (possibly...)
4033 * @qc: Taskfile currently active in engine
4035 * Handle host interrupt for given queued command. Currently,
4036 * only DMA interrupts are handled. All other commands are
4037 * handled via polling with interrupts disabled (nIEN bit).
4040 * spin_lock_irqsave(host_set lock)
4043 * One if interrupt was handled, zero if not (shared irq).
4046 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4047 struct ata_queued_cmd
*qc
)
4049 u8 status
, host_stat
;
4051 switch (qc
->tf
.protocol
) {
4054 case ATA_PROT_ATAPI_DMA
:
4055 case ATA_PROT_ATAPI
:
4056 /* check status of DMA engine */
4057 host_stat
= ap
->ops
->bmdma_status(ap
);
4058 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4060 /* if it's not our irq... */
4061 if (!(host_stat
& ATA_DMA_INTR
))
4064 /* before we do anything else, clear DMA-Start bit */
4065 ap
->ops
->bmdma_stop(qc
);
4069 case ATA_PROT_ATAPI_NODATA
:
4070 case ATA_PROT_NODATA
:
4071 /* check altstatus */
4072 status
= ata_altstatus(ap
);
4073 if (status
& ATA_BUSY
)
4076 /* check main status, clearing INTRQ */
4077 status
= ata_chk_status(ap
);
4078 if (unlikely(status
& ATA_BUSY
))
4080 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4081 ap
->id
, qc
->tf
.protocol
, status
);
4083 /* ack bmdma irq events */
4084 ap
->ops
->irq_clear(ap
);
4086 /* complete taskfile transaction */
4087 qc
->err_mask
|= ac_err_mask(status
);
4088 ata_qc_complete(qc
);
4095 return 1; /* irq handled */
4098 ap
->stats
.idle_irq
++;
4101 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4103 ata_irq_ack(ap
, 0); /* debug trap */
4104 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4107 return 0; /* irq not handled */
4111 * ata_interrupt - Default ATA host interrupt handler
4112 * @irq: irq line (unused)
4113 * @dev_instance: pointer to our ata_host_set information structure
4116 * Default interrupt handler for PCI IDE devices. Calls
4117 * ata_host_intr() for each port that is not disabled.
4120 * Obtains host_set lock during operation.
4123 * IRQ_NONE or IRQ_HANDLED.
4126 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4128 struct ata_host_set
*host_set
= dev_instance
;
4130 unsigned int handled
= 0;
4131 unsigned long flags
;
4133 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4134 spin_lock_irqsave(&host_set
->lock
, flags
);
4136 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4137 struct ata_port
*ap
;
4139 ap
= host_set
->ports
[i
];
4141 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4142 struct ata_queued_cmd
*qc
;
4144 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4145 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4146 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4147 handled
|= ata_host_intr(ap
, qc
);
4151 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4153 return IRQ_RETVAL(handled
);
4157 * atapi_packet_task - Write CDB bytes to hardware
4158 * @_data: Port to which ATAPI device is attached.
4160 * When device has indicated its readiness to accept
4161 * a CDB, this function is called. Send the CDB.
4162 * If DMA is to be performed, exit immediately.
4163 * Otherwise, we are in polling mode, so poll
4164 * status under operation succeeds or fails.
4167 * Kernel thread context (may sleep)
4170 static void atapi_packet_task(void *_data
)
4172 struct ata_port
*ap
= _data
;
4173 struct ata_queued_cmd
*qc
;
4176 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4178 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4180 /* sleep-wait for BSY to clear */
4181 DPRINTK("busy wait\n");
4182 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4183 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4187 /* make sure DRQ is set */
4188 status
= ata_chk_status(ap
);
4189 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4190 qc
->err_mask
|= AC_ERR_HSM
;
4195 DPRINTK("send cdb\n");
4196 assert(ap
->cdb_len
>= 12);
4198 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4199 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4200 unsigned long flags
;
4202 /* Once we're done issuing command and kicking bmdma,
4203 * irq handler takes over. To not lose irq, we need
4204 * to clear NOINTR flag before sending cdb, but
4205 * interrupt handler shouldn't be invoked before we're
4206 * finished. Hence, the following locking.
4208 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4209 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4210 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4211 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4212 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4213 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4215 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4217 /* PIO commands are handled by polling */
4218 ap
->hsm_task_state
= HSM_ST
;
4219 ata_queue_pio_task(ap
);
4225 ata_poll_qc_complete(qc
);
4230 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4231 * without filling any other registers
4233 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4236 struct ata_taskfile tf
;
4239 ata_tf_init(ap
, &tf
, dev
->devno
);
4242 tf
.flags
|= ATA_TFLAG_DEVICE
;
4243 tf
.protocol
= ATA_PROT_NODATA
;
4245 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4247 printk(KERN_ERR
"%s: ata command failed: %d\n",
4253 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4257 if (!ata_try_flush_cache(dev
))
4260 if (ata_id_has_flush_ext(dev
->id
))
4261 cmd
= ATA_CMD_FLUSH_EXT
;
4263 cmd
= ATA_CMD_FLUSH
;
4265 return ata_do_simple_cmd(ap
, dev
, cmd
);
4268 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4270 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4273 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4275 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4279 * ata_device_resume - wakeup a previously suspended devices
4280 * @ap: port the device is connected to
4281 * @dev: the device to resume
4283 * Kick the drive back into action, by sending it an idle immediate
4284 * command and making sure its transfer mode matches between drive
4288 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4290 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4291 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4294 if (!ata_dev_present(dev
))
4296 if (dev
->class == ATA_DEV_ATA
)
4297 ata_start_drive(ap
, dev
);
4303 * ata_device_suspend - prepare a device for suspend
4304 * @ap: port the device is connected to
4305 * @dev: the device to suspend
4307 * Flush the cache on the drive, if appropriate, then issue a
4308 * standbynow command.
4310 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4312 if (!ata_dev_present(dev
))
4314 if (dev
->class == ATA_DEV_ATA
)
4315 ata_flush_cache(ap
, dev
);
4317 ata_standby_drive(ap
, dev
);
4318 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4323 * ata_port_start - Set port up for dma.
4324 * @ap: Port to initialize
4326 * Called just after data structures for each port are
4327 * initialized. Allocates space for PRD table.
4329 * May be used as the port_start() entry in ata_port_operations.
4332 * Inherited from caller.
4335 int ata_port_start (struct ata_port
*ap
)
4337 struct device
*dev
= ap
->host_set
->dev
;
4340 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4344 rc
= ata_pad_alloc(ap
, dev
);
4346 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4350 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4357 * ata_port_stop - Undo ata_port_start()
4358 * @ap: Port to shut down
4360 * Frees the PRD table.
4362 * May be used as the port_stop() entry in ata_port_operations.
4365 * Inherited from caller.
4368 void ata_port_stop (struct ata_port
*ap
)
4370 struct device
*dev
= ap
->host_set
->dev
;
4372 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4373 ata_pad_free(ap
, dev
);
4376 void ata_host_stop (struct ata_host_set
*host_set
)
4378 if (host_set
->mmio_base
)
4379 iounmap(host_set
->mmio_base
);
4384 * ata_host_remove - Unregister SCSI host structure with upper layers
4385 * @ap: Port to unregister
4386 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4389 * Inherited from caller.
4392 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4394 struct Scsi_Host
*sh
= ap
->host
;
4399 scsi_remove_host(sh
);
4401 ap
->ops
->port_stop(ap
);
4405 * ata_host_init - Initialize an ata_port structure
4406 * @ap: Structure to initialize
4407 * @host: associated SCSI mid-layer structure
4408 * @host_set: Collection of hosts to which @ap belongs
4409 * @ent: Probe information provided by low-level driver
4410 * @port_no: Port number associated with this ata_port
4412 * Initialize a new ata_port structure, and its associated
4416 * Inherited from caller.
4419 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4420 struct ata_host_set
*host_set
,
4421 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4427 host
->max_channel
= 1;
4428 host
->unique_id
= ata_unique_id
++;
4429 host
->max_cmd_len
= 12;
4431 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4432 ap
->id
= host
->unique_id
;
4434 ap
->ctl
= ATA_DEVCTL_OBS
;
4435 ap
->host_set
= host_set
;
4436 ap
->port_no
= port_no
;
4438 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4439 ap
->pio_mask
= ent
->pio_mask
;
4440 ap
->mwdma_mask
= ent
->mwdma_mask
;
4441 ap
->udma_mask
= ent
->udma_mask
;
4442 ap
->flags
|= ent
->host_flags
;
4443 ap
->ops
= ent
->port_ops
;
4444 ap
->cbl
= ATA_CBL_NONE
;
4445 ap
->active_tag
= ATA_TAG_POISON
;
4446 ap
->last_ctl
= 0xFF;
4448 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4449 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4450 INIT_LIST_HEAD(&ap
->eh_done_q
);
4452 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4453 ap
->device
[i
].devno
= i
;
4456 ap
->stats
.unhandled_irq
= 1;
4457 ap
->stats
.idle_irq
= 1;
4460 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4464 * ata_host_add - Attach low-level ATA driver to system
4465 * @ent: Information provided by low-level driver
4466 * @host_set: Collections of ports to which we add
4467 * @port_no: Port number associated with this host
4469 * Attach low-level ATA driver to system.
4472 * PCI/etc. bus probe sem.
4475 * New ata_port on success, for NULL on error.
4478 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4479 struct ata_host_set
*host_set
,
4480 unsigned int port_no
)
4482 struct Scsi_Host
*host
;
4483 struct ata_port
*ap
;
4487 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4491 ap
= (struct ata_port
*) &host
->hostdata
[0];
4493 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4495 rc
= ap
->ops
->port_start(ap
);
4502 scsi_host_put(host
);
4507 * ata_device_add - Register hardware device with ATA and SCSI layers
4508 * @ent: Probe information describing hardware device to be registered
4510 * This function processes the information provided in the probe
4511 * information struct @ent, allocates the necessary ATA and SCSI
4512 * host information structures, initializes them, and registers
4513 * everything with requisite kernel subsystems.
4515 * This function requests irqs, probes the ATA bus, and probes
4519 * PCI/etc. bus probe sem.
4522 * Number of ports registered. Zero on error (no ports registered).
4525 int ata_device_add(const struct ata_probe_ent
*ent
)
4527 unsigned int count
= 0, i
;
4528 struct device
*dev
= ent
->dev
;
4529 struct ata_host_set
*host_set
;
4532 /* alloc a container for our list of ATA ports (buses) */
4533 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4534 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4537 spin_lock_init(&host_set
->lock
);
4539 host_set
->dev
= dev
;
4540 host_set
->n_ports
= ent
->n_ports
;
4541 host_set
->irq
= ent
->irq
;
4542 host_set
->mmio_base
= ent
->mmio_base
;
4543 host_set
->private_data
= ent
->private_data
;
4544 host_set
->ops
= ent
->port_ops
;
4546 /* register each port bound to this device */
4547 for (i
= 0; i
< ent
->n_ports
; i
++) {
4548 struct ata_port
*ap
;
4549 unsigned long xfer_mode_mask
;
4551 ap
= ata_host_add(ent
, host_set
, i
);
4555 host_set
->ports
[i
] = ap
;
4556 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4557 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4558 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4560 /* print per-port info to dmesg */
4561 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4562 "bmdma 0x%lX irq %lu\n",
4564 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4565 ata_mode_string(xfer_mode_mask
),
4566 ap
->ioaddr
.cmd_addr
,
4567 ap
->ioaddr
.ctl_addr
,
4568 ap
->ioaddr
.bmdma_addr
,
4572 host_set
->ops
->irq_clear(ap
);
4579 /* obtain irq, that is shared between channels */
4580 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4581 DRV_NAME
, host_set
))
4584 /* perform each probe synchronously */
4585 DPRINTK("probe begin\n");
4586 for (i
= 0; i
< count
; i
++) {
4587 struct ata_port
*ap
;
4590 ap
= host_set
->ports
[i
];
4592 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4593 rc
= ata_bus_probe(ap
);
4594 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4597 /* FIXME: do something useful here?
4598 * Current libata behavior will
4599 * tear down everything when
4600 * the module is removed
4601 * or the h/w is unplugged.
4605 rc
= scsi_add_host(ap
->host
, dev
);
4607 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4609 /* FIXME: do something useful here */
4610 /* FIXME: handle unconditional calls to
4611 * scsi_scan_host and ata_host_remove, below,
4617 /* probes are done, now scan each port's disk(s) */
4618 DPRINTK("host probe begin\n");
4619 for (i
= 0; i
< count
; i
++) {
4620 struct ata_port
*ap
= host_set
->ports
[i
];
4622 ata_scsi_scan_host(ap
);
4625 dev_set_drvdata(dev
, host_set
);
4627 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4628 return ent
->n_ports
; /* success */
4631 for (i
= 0; i
< count
; i
++) {
4632 ata_host_remove(host_set
->ports
[i
], 1);
4633 scsi_host_put(host_set
->ports
[i
]->host
);
4637 VPRINTK("EXIT, returning 0\n");
4642 * ata_host_set_remove - PCI layer callback for device removal
4643 * @host_set: ATA host set that was removed
4645 * Unregister all objects associated with this host set. Free those
4649 * Inherited from calling layer (may sleep).
4652 void ata_host_set_remove(struct ata_host_set
*host_set
)
4654 struct ata_port
*ap
;
4657 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4658 ap
= host_set
->ports
[i
];
4659 scsi_remove_host(ap
->host
);
4662 free_irq(host_set
->irq
, host_set
);
4664 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4665 ap
= host_set
->ports
[i
];
4667 ata_scsi_release(ap
->host
);
4669 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4670 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4672 if (ioaddr
->cmd_addr
== 0x1f0)
4673 release_region(0x1f0, 8);
4674 else if (ioaddr
->cmd_addr
== 0x170)
4675 release_region(0x170, 8);
4678 scsi_host_put(ap
->host
);
4681 if (host_set
->ops
->host_stop
)
4682 host_set
->ops
->host_stop(host_set
);
4688 * ata_scsi_release - SCSI layer callback hook for host unload
4689 * @host: libata host to be unloaded
4691 * Performs all duties necessary to shut down a libata port...
4692 * Kill port kthread, disable port, and release resources.
4695 * Inherited from SCSI layer.
4701 int ata_scsi_release(struct Scsi_Host
*host
)
4703 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4707 ap
->ops
->port_disable(ap
);
4708 ata_host_remove(ap
, 0);
4715 * ata_std_ports - initialize ioaddr with standard port offsets.
4716 * @ioaddr: IO address structure to be initialized
4718 * Utility function which initializes data_addr, error_addr,
4719 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4720 * device_addr, status_addr, and command_addr to standard offsets
4721 * relative to cmd_addr.
4723 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4726 void ata_std_ports(struct ata_ioports
*ioaddr
)
4728 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4729 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4730 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4731 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4732 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4733 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4734 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4735 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4736 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4737 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4743 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4745 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4747 pci_iounmap(pdev
, host_set
->mmio_base
);
4751 * ata_pci_remove_one - PCI layer callback for device removal
4752 * @pdev: PCI device that was removed
4754 * PCI layer indicates to libata via this hook that
4755 * hot-unplug or module unload event has occurred.
4756 * Handle this by unregistering all objects associated
4757 * with this PCI device. Free those objects. Then finally
4758 * release PCI resources and disable device.
4761 * Inherited from PCI layer (may sleep).
4764 void ata_pci_remove_one (struct pci_dev
*pdev
)
4766 struct device
*dev
= pci_dev_to_dev(pdev
);
4767 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4769 ata_host_set_remove(host_set
);
4770 pci_release_regions(pdev
);
4771 pci_disable_device(pdev
);
4772 dev_set_drvdata(dev
, NULL
);
4775 /* move to PCI subsystem */
4776 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4778 unsigned long tmp
= 0;
4780 switch (bits
->width
) {
4783 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4789 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4795 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4806 return (tmp
== bits
->val
) ? 1 : 0;
4809 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4811 pci_save_state(pdev
);
4812 pci_disable_device(pdev
);
4813 pci_set_power_state(pdev
, PCI_D3hot
);
4817 int ata_pci_device_resume(struct pci_dev
*pdev
)
4819 pci_set_power_state(pdev
, PCI_D0
);
4820 pci_restore_state(pdev
);
4821 pci_enable_device(pdev
);
4822 pci_set_master(pdev
);
4825 #endif /* CONFIG_PCI */
4828 static int __init
ata_init(void)
4830 ata_wq
= create_workqueue("ata");
4834 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4838 static void __exit
ata_exit(void)
4840 destroy_workqueue(ata_wq
);
4843 module_init(ata_init
);
4844 module_exit(ata_exit
);
4846 static unsigned long ratelimit_time
;
4847 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4849 int ata_ratelimit(void)
4852 unsigned long flags
;
4854 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4856 if (time_after(jiffies
, ratelimit_time
)) {
4858 ratelimit_time
= jiffies
+ (HZ
/5);
4862 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4868 * libata is essentially a library of internal helper functions for
4869 * low-level ATA host controller drivers. As such, the API/ABI is
4870 * likely to change as new drivers are added and updated.
4871 * Do not depend on ABI/API stability.
4874 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4875 EXPORT_SYMBOL_GPL(ata_std_ports
);
4876 EXPORT_SYMBOL_GPL(ata_device_add
);
4877 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4878 EXPORT_SYMBOL_GPL(ata_sg_init
);
4879 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4880 EXPORT_SYMBOL_GPL(ata_qc_complete
);
4881 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4882 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4883 EXPORT_SYMBOL_GPL(ata_tf_load
);
4884 EXPORT_SYMBOL_GPL(ata_tf_read
);
4885 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4886 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4887 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4888 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4889 EXPORT_SYMBOL_GPL(ata_check_status
);
4890 EXPORT_SYMBOL_GPL(ata_altstatus
);
4891 EXPORT_SYMBOL_GPL(ata_exec_command
);
4892 EXPORT_SYMBOL_GPL(ata_port_start
);
4893 EXPORT_SYMBOL_GPL(ata_port_stop
);
4894 EXPORT_SYMBOL_GPL(ata_host_stop
);
4895 EXPORT_SYMBOL_GPL(ata_interrupt
);
4896 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4897 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4898 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4899 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4900 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4901 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4902 EXPORT_SYMBOL_GPL(ata_port_probe
);
4903 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4904 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4905 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4906 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
4907 EXPORT_SYMBOL_GPL(ata_std_softreset
);
4908 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
4909 EXPORT_SYMBOL_GPL(ata_std_postreset
);
4910 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
4911 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
4912 EXPORT_SYMBOL_GPL(ata_port_disable
);
4913 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4914 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
4915 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4916 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4917 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
4918 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4919 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4920 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4921 EXPORT_SYMBOL_GPL(ata_host_intr
);
4922 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4923 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
4924 EXPORT_SYMBOL_GPL(ata_dev_config
);
4925 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4926 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
4927 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
4929 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
4930 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4931 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4934 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4935 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4936 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4937 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4938 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4939 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
4940 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
4941 #endif /* CONFIG_PCI */
4943 EXPORT_SYMBOL_GPL(ata_device_suspend
);
4944 EXPORT_SYMBOL_GPL(ata_device_resume
);
4945 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
4946 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);