2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static 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)");
82 module_param_named(fua
, libata_fua
, int, 0444);
83 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
85 MODULE_AUTHOR("Jeff Garzik");
86 MODULE_DESCRIPTION("Library module for ATA devices");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION
);
92 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
93 * @tf: Taskfile to convert
94 * @fis: Buffer into which data will output
95 * @pmp: Port multiplier port
97 * Converts a standard ATA taskfile to a Serial ATA
98 * FIS structure (Register - Host to Device).
101 * Inherited from caller.
104 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
106 fis
[0] = 0x27; /* Register - Host to Device FIS */
107 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
108 bit 7 indicates Command FIS */
109 fis
[2] = tf
->command
;
110 fis
[3] = tf
->feature
;
117 fis
[8] = tf
->hob_lbal
;
118 fis
[9] = tf
->hob_lbam
;
119 fis
[10] = tf
->hob_lbah
;
120 fis
[11] = tf
->hob_feature
;
123 fis
[13] = tf
->hob_nsect
;
134 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
135 * @fis: Buffer from which data will be input
136 * @tf: Taskfile to output
138 * Converts a serial ATA FIS structure to a standard ATA taskfile.
141 * Inherited from caller.
144 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
146 tf
->command
= fis
[2]; /* status */
147 tf
->feature
= fis
[3]; /* error */
154 tf
->hob_lbal
= fis
[8];
155 tf
->hob_lbam
= fis
[9];
156 tf
->hob_lbah
= fis
[10];
159 tf
->hob_nsect
= fis
[13];
162 static const u8 ata_rw_cmds
[] = {
166 ATA_CMD_READ_MULTI_EXT
,
167 ATA_CMD_WRITE_MULTI_EXT
,
171 ATA_CMD_WRITE_MULTI_FUA_EXT
,
175 ATA_CMD_PIO_READ_EXT
,
176 ATA_CMD_PIO_WRITE_EXT
,
189 ATA_CMD_WRITE_FUA_EXT
193 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
194 * @qc: command to examine and configure
196 * Examine the device configuration and tf->flags to calculate
197 * the proper read/write commands and protocol to use.
202 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
204 struct ata_taskfile
*tf
= &qc
->tf
;
205 struct ata_device
*dev
= qc
->dev
;
208 int index
, fua
, lba48
, write
;
210 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
211 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
212 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
214 if (dev
->flags
& ATA_DFLAG_PIO
) {
215 tf
->protocol
= ATA_PROT_PIO
;
216 index
= dev
->multi_count
? 0 : 8;
217 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
218 /* Unable to use DMA due to host limitation */
219 tf
->protocol
= ATA_PROT_PIO
;
220 index
= dev
->multi_count
? 0 : 8;
222 tf
->protocol
= ATA_PROT_DMA
;
226 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
234 static const char * const xfer_mode_str
[] = {
254 * ata_udma_string - convert UDMA bit offset to string
255 * @mask: mask of bits supported; only highest bit counts.
257 * Determine string which represents the highest speed
258 * (highest bit in @udma_mask).
264 * Constant C string representing highest speed listed in
265 * @udma_mask, or the constant C string "<n/a>".
268 static const char *ata_mode_string(unsigned int mask
)
272 for (i
= 7; i
>= 0; i
--)
275 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
278 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
285 return xfer_mode_str
[i
];
289 * ata_pio_devchk - PATA device presence detection
290 * @ap: ATA channel to examine
291 * @device: Device to examine (starting at zero)
293 * This technique was originally described in
294 * Hale Landis's ATADRVR (www.ata-atapi.com), and
295 * later found its way into the ATA/ATAPI spec.
297 * Write a pattern to the ATA shadow registers,
298 * and if a device is present, it will respond by
299 * correctly storing and echoing back the
300 * ATA shadow register contents.
306 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
309 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
312 ap
->ops
->dev_select(ap
, device
);
314 outb(0x55, ioaddr
->nsect_addr
);
315 outb(0xaa, ioaddr
->lbal_addr
);
317 outb(0xaa, ioaddr
->nsect_addr
);
318 outb(0x55, ioaddr
->lbal_addr
);
320 outb(0x55, ioaddr
->nsect_addr
);
321 outb(0xaa, ioaddr
->lbal_addr
);
323 nsect
= inb(ioaddr
->nsect_addr
);
324 lbal
= inb(ioaddr
->lbal_addr
);
326 if ((nsect
== 0x55) && (lbal
== 0xaa))
327 return 1; /* we found a device */
329 return 0; /* nothing found */
333 * ata_mmio_devchk - PATA device presence detection
334 * @ap: ATA channel to examine
335 * @device: Device to examine (starting at zero)
337 * This technique was originally described in
338 * Hale Landis's ATADRVR (www.ata-atapi.com), and
339 * later found its way into the ATA/ATAPI spec.
341 * Write a pattern to the ATA shadow registers,
342 * and if a device is present, it will respond by
343 * correctly storing and echoing back the
344 * ATA shadow register contents.
350 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
353 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
356 ap
->ops
->dev_select(ap
, device
);
358 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
359 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
361 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
362 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
364 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
365 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
367 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
368 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
370 if ((nsect
== 0x55) && (lbal
== 0xaa))
371 return 1; /* we found a device */
373 return 0; /* nothing found */
377 * ata_devchk - PATA device presence detection
378 * @ap: ATA channel to examine
379 * @device: Device to examine (starting at zero)
381 * Dispatch ATA device presence detection, depending
382 * on whether we are using PIO or MMIO to talk to the
383 * ATA shadow registers.
389 static unsigned int ata_devchk(struct ata_port
*ap
,
392 if (ap
->flags
& ATA_FLAG_MMIO
)
393 return ata_mmio_devchk(ap
, device
);
394 return ata_pio_devchk(ap
, device
);
398 * ata_dev_classify - determine device type based on ATA-spec signature
399 * @tf: ATA taskfile register set for device to be identified
401 * Determine from taskfile register contents whether a device is
402 * ATA or ATAPI, as per "Signature and persistence" section
403 * of ATA/PI spec (volume 1, sect 5.14).
409 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
410 * the event of failure.
413 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
415 /* Apple's open source Darwin code hints that some devices only
416 * put a proper signature into the LBA mid/high registers,
417 * So, we only check those. It's sufficient for uniqueness.
420 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
421 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
422 DPRINTK("found ATA device by sig\n");
426 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
427 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
428 DPRINTK("found ATAPI device by sig\n");
429 return ATA_DEV_ATAPI
;
432 DPRINTK("unknown device\n");
433 return ATA_DEV_UNKNOWN
;
437 * ata_dev_try_classify - Parse returned ATA device signature
438 * @ap: ATA channel to examine
439 * @device: Device to examine (starting at zero)
440 * @r_err: Value of error register on completion
442 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
443 * an ATA/ATAPI-defined set of values is placed in the ATA
444 * shadow registers, indicating the results of device detection
447 * Select the ATA device, and read the values from the ATA shadow
448 * registers. Then parse according to the Error register value,
449 * and the spec-defined values examined by ata_dev_classify().
455 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
459 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
461 struct ata_taskfile tf
;
465 ap
->ops
->dev_select(ap
, device
);
467 memset(&tf
, 0, sizeof(tf
));
469 ap
->ops
->tf_read(ap
, &tf
);
474 /* see if device passed diags */
477 else if ((device
== 0) && (err
== 0x81))
482 /* determine if device is ATA or ATAPI */
483 class = ata_dev_classify(&tf
);
485 if (class == ATA_DEV_UNKNOWN
)
487 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
493 * ata_id_string - Convert IDENTIFY DEVICE page into string
494 * @id: IDENTIFY DEVICE results we will examine
495 * @s: string into which data is output
496 * @ofs: offset into identify device page
497 * @len: length of string to return. must be an even number.
499 * The strings in the IDENTIFY DEVICE page are broken up into
500 * 16-bit chunks. Run through the string, and output each
501 * 8-bit chunk linearly, regardless of platform.
507 void ata_id_string(const u16
*id
, unsigned char *s
,
508 unsigned int ofs
, unsigned int len
)
527 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
528 * @id: IDENTIFY DEVICE results we will examine
529 * @s: string into which data is output
530 * @ofs: offset into identify device page
531 * @len: length of string to return. must be an odd number.
533 * This function is identical to ata_id_string except that it
534 * trims trailing spaces and terminates the resulting string with
535 * null. @len must be actual maximum length (even number) + 1.
540 void ata_id_c_string(const u16
*id
, unsigned char *s
,
541 unsigned int ofs
, unsigned int len
)
547 ata_id_string(id
, s
, ofs
, len
- 1);
549 p
= s
+ strnlen(s
, len
- 1);
550 while (p
> s
&& p
[-1] == ' ')
555 static u64
ata_id_n_sectors(const u16
*id
)
557 if (ata_id_has_lba(id
)) {
558 if (ata_id_has_lba48(id
))
559 return ata_id_u64(id
, 100);
561 return ata_id_u32(id
, 60);
563 if (ata_id_current_chs_valid(id
))
564 return ata_id_u32(id
, 57);
566 return id
[1] * id
[3] * id
[6];
571 * ata_noop_dev_select - Select device 0/1 on ATA bus
572 * @ap: ATA channel to manipulate
573 * @device: ATA device (numbered from zero) to select
575 * This function performs no actual function.
577 * May be used as the dev_select() entry in ata_port_operations.
582 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
588 * ata_std_dev_select - Select device 0/1 on ATA bus
589 * @ap: ATA channel to manipulate
590 * @device: ATA device (numbered from zero) to select
592 * Use the method defined in the ATA specification to
593 * make either device 0, or device 1, active on the
594 * ATA channel. Works with both PIO and MMIO.
596 * May be used as the dev_select() entry in ata_port_operations.
602 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
607 tmp
= ATA_DEVICE_OBS
;
609 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
611 if (ap
->flags
& ATA_FLAG_MMIO
) {
612 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
614 outb(tmp
, ap
->ioaddr
.device_addr
);
616 ata_pause(ap
); /* needed; also flushes, for mmio */
620 * ata_dev_select - Select device 0/1 on ATA bus
621 * @ap: ATA channel to manipulate
622 * @device: ATA device (numbered from zero) to select
623 * @wait: non-zero to wait for Status register BSY bit to clear
624 * @can_sleep: non-zero if context allows sleeping
626 * Use the method defined in the ATA specification to
627 * make either device 0, or device 1, active on the
630 * This is a high-level version of ata_std_dev_select(),
631 * which additionally provides the services of inserting
632 * the proper pauses and status polling, where needed.
638 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
639 unsigned int wait
, unsigned int can_sleep
)
641 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
642 ap
->id
, device
, wait
);
647 ap
->ops
->dev_select(ap
, device
);
650 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
657 * ata_dump_id - IDENTIFY DEVICE info debugging output
658 * @id: IDENTIFY DEVICE page to dump
660 * Dump selected 16-bit words from the given IDENTIFY DEVICE
667 static inline void ata_dump_id(const u16
*id
)
669 DPRINTK("49==0x%04x "
679 DPRINTK("80==0x%04x "
689 DPRINTK("88==0x%04x "
696 * Compute the PIO modes available for this device. This is not as
697 * trivial as it seems if we must consider early devices correctly.
699 * FIXME: pre IDE drive timing (do we care ?).
702 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
706 /* Usual case. Word 53 indicates word 64 is valid */
707 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
708 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
714 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
715 number for the maximum. Turn it into a mask and return it */
716 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
718 /* But wait.. there's more. Design your standards by committee and
719 you too can get a free iordy field to process. However its the
720 speeds not the modes that are supported... Note drivers using the
721 timing API will get this right anyway */
725 ata_queue_packet_task(struct ata_port
*ap
)
727 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
728 queue_work(ata_wq
, &ap
->packet_task
);
732 ata_queue_pio_task(struct ata_port
*ap
)
734 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
735 queue_work(ata_wq
, &ap
->pio_task
);
739 ata_queue_delayed_pio_task(struct ata_port
*ap
, unsigned long delay
)
741 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
742 queue_delayed_work(ata_wq
, &ap
->pio_task
, delay
);
746 * ata_flush_pio_tasks - Flush pio_task and packet_task
747 * @ap: the target ata_port
749 * After this function completes, pio_task and packet_task are
750 * guranteed not to be running or scheduled.
753 * Kernel thread context (may sleep)
756 static void ata_flush_pio_tasks(struct ata_port
*ap
)
763 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
764 ap
->flags
|= ATA_FLAG_FLUSH_PIO_TASK
;
765 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
767 DPRINTK("flush #1\n");
768 flush_workqueue(ata_wq
);
771 * At this point, if a task is running, it's guaranteed to see
772 * the FLUSH flag; thus, it will never queue pio tasks again.
775 tmp
|= cancel_delayed_work(&ap
->pio_task
);
776 tmp
|= cancel_delayed_work(&ap
->packet_task
);
778 DPRINTK("flush #2\n");
779 flush_workqueue(ata_wq
);
782 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
783 ap
->flags
&= ~ATA_FLAG_FLUSH_PIO_TASK
;
784 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
789 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
791 struct completion
*waiting
= qc
->private_data
;
793 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
798 * ata_exec_internal - execute libata internal command
799 * @ap: Port to which the command is sent
800 * @dev: Device to which the command is sent
801 * @tf: Taskfile registers for the command and the result
802 * @dma_dir: Data tranfer direction of the command
803 * @buf: Data buffer of the command
804 * @buflen: Length of data buffer
806 * Executes libata internal command with timeout. @tf contains
807 * command on entry and result on return. Timeout and error
808 * conditions are reported via return value. No recovery action
809 * is taken after a command times out. It's caller's duty to
810 * clean up after timeout.
813 * None. Should be called with kernel context, might sleep.
817 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
818 struct ata_taskfile
*tf
,
819 int dma_dir
, void *buf
, unsigned int buflen
)
821 u8 command
= tf
->command
;
822 struct ata_queued_cmd
*qc
;
823 DECLARE_COMPLETION(wait
);
825 unsigned int err_mask
;
827 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
829 qc
= ata_qc_new_init(ap
, dev
);
833 qc
->dma_dir
= dma_dir
;
834 if (dma_dir
!= DMA_NONE
) {
835 ata_sg_init_one(qc
, buf
, buflen
);
836 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
839 qc
->private_data
= &wait
;
840 qc
->complete_fn
= ata_qc_complete_internal
;
842 qc
->err_mask
= ata_qc_issue(qc
);
846 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
848 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
849 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
851 /* We're racing with irq here. If we lose, the
852 * following test prevents us from completing the qc
853 * again. If completion irq occurs after here but
854 * before the caller cleans up, it will result in a
855 * spurious interrupt. We can live with that.
857 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
858 qc
->err_mask
= AC_ERR_TIMEOUT
;
860 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
864 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
868 err_mask
= qc
->err_mask
;
876 * ata_pio_need_iordy - check if iordy needed
879 * Check if the current speed of the device requires IORDY. Used
880 * by various controllers for chip configuration.
883 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
886 int speed
= adev
->pio_mode
- XFER_PIO_0
;
893 /* If we have no drive specific rule, then PIO 2 is non IORDY */
895 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
896 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
897 /* Is the speed faster than the drive allows non IORDY ? */
899 /* This is cycle times not frequency - watch the logic! */
900 if (pio
> 240) /* PIO2 is 240nS per cycle */
909 * ata_dev_read_id - Read ID data from the specified device
910 * @ap: port on which target device resides
911 * @dev: target device
912 * @p_class: pointer to class of the target device (may be changed)
913 * @post_reset: is this read ID post-reset?
914 * @p_id: read IDENTIFY page (newly allocated)
916 * Read ID data from the specified device. ATA_CMD_ID_ATA is
917 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
918 * devices. This function also takes care of EDD signature
919 * misreporting (to be removed once EDD support is gone) and
920 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
923 * Kernel thread context (may sleep)
926 * 0 on success, -errno otherwise.
928 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
929 unsigned int *p_class
, int post_reset
, u16
**p_id
)
931 unsigned int class = *p_class
;
932 unsigned int using_edd
;
933 struct ata_taskfile tf
;
934 unsigned int err_mask
= 0;
939 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
941 if (ap
->ops
->probe_reset
||
942 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
947 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
949 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
952 reason
= "out of memory";
957 ata_tf_init(ap
, &tf
, dev
->devno
);
961 tf
.command
= ATA_CMD_ID_ATA
;
964 tf
.command
= ATA_CMD_ID_ATAPI
;
968 reason
= "unsupported class";
972 tf
.protocol
= ATA_PROT_PIO
;
974 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
975 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
979 reason
= "I/O error";
981 if (err_mask
& ~AC_ERR_DEV
)
985 * arg! EDD works for all test cases, but seems to return
986 * the ATA signature for some ATAPI devices. Until the
987 * reason for this is found and fixed, we fix up the mess
988 * here. If IDENTIFY DEVICE returns command aborted
989 * (as ATAPI devices do), then we issue an
990 * IDENTIFY PACKET DEVICE.
992 * ATA software reset (SRST, the default) does not appear
993 * to have this problem.
995 if ((using_edd
) && (class == ATA_DEV_ATA
)) {
997 if (err
& ATA_ABORTED
) {
998 class = ATA_DEV_ATAPI
;
1005 swap_buf_le16(id
, ATA_ID_WORDS
);
1007 /* print device capabilities */
1008 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1009 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1011 id
[49], id
[82], id
[83], id
[84], id
[85], id
[86], id
[87], id
[88]);
1014 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1016 reason
= "device reports illegal type";
1020 if (post_reset
&& class == ATA_DEV_ATA
) {
1022 * The exact sequence expected by certain pre-ATA4 drives is:
1025 * INITIALIZE DEVICE PARAMETERS
1027 * Some drives were very specific about that exact sequence.
1029 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1030 err_mask
= ata_dev_init_params(ap
, dev
);
1033 reason
= "INIT_DEV_PARAMS failed";
1037 /* current CHS translation info (id[53-58]) might be
1038 * changed. reread the identify device info.
1050 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1051 ap
->id
, dev
->devno
, reason
);
1056 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1057 struct ata_device
*dev
)
1059 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1063 * ata_dev_configure - Configure the specified ATA/ATAPI device
1064 * @ap: Port on which target device resides
1065 * @dev: Target device to configure
1066 * @print_info: Enable device info printout
1068 * Configure @dev according to @dev->id. Generic and low-level
1069 * driver specific fixups are also applied.
1072 * Kernel thread context (may sleep)
1075 * 0 on success, -errno otherwise
1077 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1080 unsigned long xfer_modes
;
1083 if (!ata_dev_present(dev
)) {
1084 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1085 ap
->id
, dev
->devno
);
1089 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1091 /* initialize to-be-configured parameters */
1093 dev
->max_sectors
= 0;
1101 * common ATA, ATAPI feature tests
1104 /* we require DMA support (bits 8 of word 49) */
1105 if (!ata_id_has_dma(dev
->id
)) {
1106 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1111 /* quick-n-dirty find max transfer mode; for printk only */
1112 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1114 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1116 xfer_modes
= ata_pio_modes(dev
);
1118 ata_dump_id(dev
->id
);
1120 /* ATA-specific feature tests */
1121 if (dev
->class == ATA_DEV_ATA
) {
1122 dev
->n_sectors
= ata_id_n_sectors(dev
->id
);
1124 if (ata_id_has_lba(dev
->id
)) {
1125 const char *lba_desc
;
1128 dev
->flags
|= ATA_DFLAG_LBA
;
1129 if (ata_id_has_lba48(dev
->id
)) {
1130 dev
->flags
|= ATA_DFLAG_LBA48
;
1134 /* print device info to dmesg */
1136 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1137 "max %s, %Lu sectors: %s\n",
1139 ata_id_major_version(dev
->id
),
1140 ata_mode_string(xfer_modes
),
1141 (unsigned long long)dev
->n_sectors
,
1146 /* Default translation */
1147 dev
->cylinders
= dev
->id
[1];
1148 dev
->heads
= dev
->id
[3];
1149 dev
->sectors
= dev
->id
[6];
1151 if (ata_id_current_chs_valid(dev
->id
)) {
1152 /* Current CHS translation is valid. */
1153 dev
->cylinders
= dev
->id
[54];
1154 dev
->heads
= dev
->id
[55];
1155 dev
->sectors
= dev
->id
[56];
1158 /* print device info to dmesg */
1160 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1161 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1163 ata_id_major_version(dev
->id
),
1164 ata_mode_string(xfer_modes
),
1165 (unsigned long long)dev
->n_sectors
,
1166 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1172 /* ATAPI-specific feature tests */
1173 else if (dev
->class == ATA_DEV_ATAPI
) {
1174 rc
= atapi_cdb_len(dev
->id
);
1175 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1176 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1180 dev
->cdb_len
= (unsigned int) rc
;
1182 /* print device info to dmesg */
1184 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1185 ap
->id
, dev
->devno
, ata_mode_string(xfer_modes
));
1188 ap
->host
->max_cmd_len
= 0;
1189 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1190 ap
->host
->max_cmd_len
= max_t(unsigned int,
1191 ap
->host
->max_cmd_len
,
1192 ap
->device
[i
].cdb_len
);
1194 /* limit bridge transfers to udma5, 200 sectors */
1195 if (ata_dev_knobble(ap
, dev
)) {
1197 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1198 ap
->id
, dev
->devno
);
1199 ap
->udma_mask
&= ATA_UDMA5
;
1200 dev
->max_sectors
= ATA_MAX_SECTORS
;
1203 if (ap
->ops
->dev_config
)
1204 ap
->ops
->dev_config(ap
, dev
);
1206 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1210 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1211 ap
->id
, dev
->devno
);
1212 DPRINTK("EXIT, err\n");
1217 * ata_bus_probe - Reset and probe ATA bus
1220 * Master ATA bus probing function. Initiates a hardware-dependent
1221 * bus reset, then attempts to identify any devices found on
1225 * PCI/etc. bus probe sem.
1228 * Zero on success, non-zero on error.
1231 static int ata_bus_probe(struct ata_port
*ap
)
1233 unsigned int classes
[ATA_MAX_DEVICES
];
1234 unsigned int i
, rc
, found
= 0;
1239 if (ap
->ops
->probe_reset
) {
1240 rc
= ap
->ops
->probe_reset(ap
, classes
);
1242 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1246 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1247 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1248 classes
[i
] = ATA_DEV_NONE
;
1250 ap
->ops
->phy_reset(ap
);
1252 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1253 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1254 classes
[i
] = ap
->device
[i
].class;
1256 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1261 /* read IDENTIFY page and configure devices */
1262 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1263 struct ata_device
*dev
= &ap
->device
[i
];
1265 dev
->class = classes
[i
];
1267 if (!ata_dev_present(dev
))
1270 WARN_ON(dev
->id
!= NULL
);
1271 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1272 dev
->class = ATA_DEV_NONE
;
1276 if (ata_dev_configure(ap
, dev
, 1)) {
1277 dev
->class++; /* disable device */
1285 goto err_out_disable
;
1288 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1289 goto err_out_disable
;
1294 ap
->ops
->port_disable(ap
);
1299 * ata_port_probe - Mark port as enabled
1300 * @ap: Port for which we indicate enablement
1302 * Modify @ap data structure such that the system
1303 * thinks that the entire port is enabled.
1305 * LOCKING: host_set lock, or some other form of
1309 void ata_port_probe(struct ata_port
*ap
)
1311 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1315 * sata_print_link_status - Print SATA link status
1316 * @ap: SATA port to printk link status about
1318 * This function prints link speed and status of a SATA link.
1323 static void sata_print_link_status(struct ata_port
*ap
)
1328 if (!ap
->ops
->scr_read
)
1331 sstatus
= scr_read(ap
, SCR_STATUS
);
1333 if (sata_dev_present(ap
)) {
1334 tmp
= (sstatus
>> 4) & 0xf;
1337 else if (tmp
& (1 << 1))
1340 speed
= "<unknown>";
1341 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1342 ap
->id
, speed
, sstatus
);
1344 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1350 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1351 * @ap: SATA port associated with target SATA PHY.
1353 * This function issues commands to standard SATA Sxxx
1354 * PHY registers, to wake up the phy (and device), and
1355 * clear any reset condition.
1358 * PCI/etc. bus probe sem.
1361 void __sata_phy_reset(struct ata_port
*ap
)
1364 unsigned long timeout
= jiffies
+ (HZ
* 5);
1366 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1367 /* issue phy wake/reset */
1368 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1369 /* Couldn't find anything in SATA I/II specs, but
1370 * AHCI-1.1 10.4.2 says at least 1 ms. */
1373 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1375 /* wait for phy to become ready, if necessary */
1378 sstatus
= scr_read(ap
, SCR_STATUS
);
1379 if ((sstatus
& 0xf) != 1)
1381 } while (time_before(jiffies
, timeout
));
1383 /* print link status */
1384 sata_print_link_status(ap
);
1386 /* TODO: phy layer with polling, timeouts, etc. */
1387 if (sata_dev_present(ap
))
1390 ata_port_disable(ap
);
1392 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1395 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1396 ata_port_disable(ap
);
1400 ap
->cbl
= ATA_CBL_SATA
;
1404 * sata_phy_reset - Reset SATA bus.
1405 * @ap: SATA port associated with target SATA PHY.
1407 * This function resets the SATA bus, and then probes
1408 * the bus for devices.
1411 * PCI/etc. bus probe sem.
1414 void sata_phy_reset(struct ata_port
*ap
)
1416 __sata_phy_reset(ap
);
1417 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1423 * ata_port_disable - Disable port.
1424 * @ap: Port to be disabled.
1426 * Modify @ap data structure such that the system
1427 * thinks that the entire port is disabled, and should
1428 * never attempt to probe or communicate with devices
1431 * LOCKING: host_set lock, or some other form of
1435 void ata_port_disable(struct ata_port
*ap
)
1437 ap
->device
[0].class = ATA_DEV_NONE
;
1438 ap
->device
[1].class = ATA_DEV_NONE
;
1439 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1443 * This mode timing computation functionality is ported over from
1444 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1447 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1448 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1449 * for PIO 5, which is a nonstandard extension and UDMA6, which
1450 * is currently supported only by Maxtor drives.
1453 static const struct ata_timing ata_timing
[] = {
1455 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1456 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1457 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1458 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1460 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1461 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1462 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1464 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1466 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1467 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1468 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1470 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1471 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1472 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1474 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1475 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1476 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1478 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1479 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1480 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1482 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1487 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1488 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1490 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1492 q
->setup
= EZ(t
->setup
* 1000, T
);
1493 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1494 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1495 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1496 q
->active
= EZ(t
->active
* 1000, T
);
1497 q
->recover
= EZ(t
->recover
* 1000, T
);
1498 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1499 q
->udma
= EZ(t
->udma
* 1000, UT
);
1502 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1503 struct ata_timing
*m
, unsigned int what
)
1505 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1506 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1507 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1508 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1509 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1510 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1511 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1512 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1515 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1517 const struct ata_timing
*t
;
1519 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1520 if (t
->mode
== 0xFF)
1525 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1526 struct ata_timing
*t
, int T
, int UT
)
1528 const struct ata_timing
*s
;
1529 struct ata_timing p
;
1535 if (!(s
= ata_timing_find_mode(speed
)))
1538 memcpy(t
, s
, sizeof(*s
));
1541 * If the drive is an EIDE drive, it can tell us it needs extended
1542 * PIO/MW_DMA cycle timing.
1545 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1546 memset(&p
, 0, sizeof(p
));
1547 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1548 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1549 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1550 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1551 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1553 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1557 * Convert the timing to bus clock counts.
1560 ata_timing_quantize(t
, t
, T
, UT
);
1563 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1564 * S.M.A.R.T * and some other commands. We have to ensure that the
1565 * DMA cycle timing is slower/equal than the fastest PIO timing.
1568 if (speed
> XFER_PIO_4
) {
1569 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1570 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1574 * Lengthen active & recovery time so that cycle time is correct.
1577 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1578 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1579 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1582 if (t
->active
+ t
->recover
< t
->cycle
) {
1583 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1584 t
->recover
= t
->cycle
- t
->active
;
1590 static const struct {
1593 } xfer_mode_classes
[] = {
1594 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1595 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1596 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1599 static u8
base_from_shift(unsigned int shift
)
1603 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1604 if (xfer_mode_classes
[i
].shift
== shift
)
1605 return xfer_mode_classes
[i
].base
;
1610 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1615 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1618 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1619 dev
->flags
|= ATA_DFLAG_PIO
;
1621 ata_dev_set_xfermode(ap
, dev
);
1623 base
= base_from_shift(dev
->xfer_shift
);
1624 ofs
= dev
->xfer_mode
- base
;
1625 idx
= ofs
+ dev
->xfer_shift
;
1626 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1628 if (ata_dev_revalidate(ap
, dev
, 0)) {
1629 printk(KERN_ERR
"ata%u: failed to revalidate after set "
1630 "xfermode, disabled\n", ap
->id
);
1631 ata_port_disable(ap
);
1634 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1635 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1637 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1638 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1641 static int ata_host_set_pio(struct ata_port
*ap
)
1647 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1650 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1654 base
= base_from_shift(ATA_SHIFT_PIO
);
1655 xfer_mode
= base
+ x
;
1657 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1658 (int)base
, (int)xfer_mode
, mask
, x
);
1660 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1661 struct ata_device
*dev
= &ap
->device
[i
];
1662 if (ata_dev_present(dev
)) {
1663 dev
->pio_mode
= xfer_mode
;
1664 dev
->xfer_mode
= xfer_mode
;
1665 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1666 if (ap
->ops
->set_piomode
)
1667 ap
->ops
->set_piomode(ap
, dev
);
1674 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1675 unsigned int xfer_shift
)
1679 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1680 struct ata_device
*dev
= &ap
->device
[i
];
1681 if (ata_dev_present(dev
)) {
1682 dev
->dma_mode
= xfer_mode
;
1683 dev
->xfer_mode
= xfer_mode
;
1684 dev
->xfer_shift
= xfer_shift
;
1685 if (ap
->ops
->set_dmamode
)
1686 ap
->ops
->set_dmamode(ap
, dev
);
1692 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1693 * @ap: port on which timings will be programmed
1695 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1698 * PCI/etc. bus probe sem.
1700 static void ata_set_mode(struct ata_port
*ap
)
1702 unsigned int xfer_shift
;
1706 /* step 1: always set host PIO timings */
1707 rc
= ata_host_set_pio(ap
);
1711 /* step 2: choose the best data xfer mode */
1712 xfer_mode
= xfer_shift
= 0;
1713 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1717 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1718 if (xfer_shift
!= ATA_SHIFT_PIO
)
1719 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1721 /* step 4: update devices' xfer mode */
1722 ata_dev_set_mode(ap
, &ap
->device
[0]);
1723 ata_dev_set_mode(ap
, &ap
->device
[1]);
1725 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1728 if (ap
->ops
->post_set_mode
)
1729 ap
->ops
->post_set_mode(ap
);
1734 ata_port_disable(ap
);
1738 * ata_tf_to_host - issue ATA taskfile to host controller
1739 * @ap: port to which command is being issued
1740 * @tf: ATA taskfile register set
1742 * Issues ATA taskfile register set to ATA host controller,
1743 * with proper synchronization with interrupt handler and
1747 * spin_lock_irqsave(host_set lock)
1750 static inline void ata_tf_to_host(struct ata_port
*ap
,
1751 const struct ata_taskfile
*tf
)
1753 ap
->ops
->tf_load(ap
, tf
);
1754 ap
->ops
->exec_command(ap
, tf
);
1758 * ata_busy_sleep - sleep until BSY clears, or timeout
1759 * @ap: port containing status register to be polled
1760 * @tmout_pat: impatience timeout
1761 * @tmout: overall timeout
1763 * Sleep until ATA Status register bit BSY clears,
1764 * or a timeout occurs.
1769 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1770 unsigned long tmout_pat
, unsigned long tmout
)
1772 unsigned long timer_start
, timeout
;
1775 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1776 timer_start
= jiffies
;
1777 timeout
= timer_start
+ tmout_pat
;
1778 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1780 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1783 if (status
& ATA_BUSY
)
1784 printk(KERN_WARNING
"ata%u is slow to respond, "
1785 "please be patient\n", ap
->id
);
1787 timeout
= timer_start
+ tmout
;
1788 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1790 status
= ata_chk_status(ap
);
1793 if (status
& ATA_BUSY
) {
1794 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1795 ap
->id
, tmout
/ HZ
);
1802 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1804 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1805 unsigned int dev0
= devmask
& (1 << 0);
1806 unsigned int dev1
= devmask
& (1 << 1);
1807 unsigned long timeout
;
1809 /* if device 0 was found in ata_devchk, wait for its
1813 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1815 /* if device 1 was found in ata_devchk, wait for
1816 * register access, then wait for BSY to clear
1818 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1822 ap
->ops
->dev_select(ap
, 1);
1823 if (ap
->flags
& ATA_FLAG_MMIO
) {
1824 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1825 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1827 nsect
= inb(ioaddr
->nsect_addr
);
1828 lbal
= inb(ioaddr
->lbal_addr
);
1830 if ((nsect
== 1) && (lbal
== 1))
1832 if (time_after(jiffies
, timeout
)) {
1836 msleep(50); /* give drive a breather */
1839 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1841 /* is all this really necessary? */
1842 ap
->ops
->dev_select(ap
, 0);
1844 ap
->ops
->dev_select(ap
, 1);
1846 ap
->ops
->dev_select(ap
, 0);
1850 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1851 * @ap: Port to reset and probe
1853 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1854 * probe the bus. Not often used these days.
1857 * PCI/etc. bus probe sem.
1858 * Obtains host_set lock.
1862 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1864 struct ata_taskfile tf
;
1865 unsigned long flags
;
1867 /* set up execute-device-diag (bus reset) taskfile */
1868 /* also, take interrupts to a known state (disabled) */
1869 DPRINTK("execute-device-diag\n");
1870 ata_tf_init(ap
, &tf
, 0);
1872 tf
.command
= ATA_CMD_EDD
;
1873 tf
.protocol
= ATA_PROT_NODATA
;
1876 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1877 ata_tf_to_host(ap
, &tf
);
1878 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1880 /* spec says at least 2ms. but who knows with those
1881 * crazy ATAPI devices...
1885 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1888 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1889 unsigned int devmask
)
1891 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1893 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1895 /* software reset. causes dev0 to be selected */
1896 if (ap
->flags
& ATA_FLAG_MMIO
) {
1897 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1898 udelay(20); /* FIXME: flush */
1899 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1900 udelay(20); /* FIXME: flush */
1901 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1903 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1905 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1907 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1910 /* spec mandates ">= 2ms" before checking status.
1911 * We wait 150ms, because that was the magic delay used for
1912 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1913 * between when the ATA command register is written, and then
1914 * status is checked. Because waiting for "a while" before
1915 * checking status is fine, post SRST, we perform this magic
1916 * delay here as well.
1920 ata_bus_post_reset(ap
, devmask
);
1926 * ata_bus_reset - reset host port and associated ATA channel
1927 * @ap: port to reset
1929 * This is typically the first time we actually start issuing
1930 * commands to the ATA channel. We wait for BSY to clear, then
1931 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1932 * result. Determine what devices, if any, are on the channel
1933 * by looking at the device 0/1 error register. Look at the signature
1934 * stored in each device's taskfile registers, to determine if
1935 * the device is ATA or ATAPI.
1938 * PCI/etc. bus probe sem.
1939 * Obtains host_set lock.
1942 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1945 void ata_bus_reset(struct ata_port
*ap
)
1947 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1948 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1950 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1952 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1954 /* determine if device 0/1 are present */
1955 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1958 dev0
= ata_devchk(ap
, 0);
1960 dev1
= ata_devchk(ap
, 1);
1964 devmask
|= (1 << 0);
1966 devmask
|= (1 << 1);
1968 /* select device 0 again */
1969 ap
->ops
->dev_select(ap
, 0);
1971 /* issue bus reset */
1972 if (ap
->flags
& ATA_FLAG_SRST
)
1973 rc
= ata_bus_softreset(ap
, devmask
);
1974 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1975 /* set up device control */
1976 if (ap
->flags
& ATA_FLAG_MMIO
)
1977 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1979 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1980 rc
= ata_bus_edd(ap
);
1987 * determine by signature whether we have ATA or ATAPI devices
1989 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1990 if ((slave_possible
) && (err
!= 0x81))
1991 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1993 /* re-enable interrupts */
1994 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1997 /* is double-select really necessary? */
1998 if (ap
->device
[1].class != ATA_DEV_NONE
)
1999 ap
->ops
->dev_select(ap
, 1);
2000 if (ap
->device
[0].class != ATA_DEV_NONE
)
2001 ap
->ops
->dev_select(ap
, 0);
2003 /* if no devices were detected, disable this port */
2004 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2005 (ap
->device
[1].class == ATA_DEV_NONE
))
2008 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2009 /* set up device control for ATA_FLAG_SATA_RESET */
2010 if (ap
->flags
& ATA_FLAG_MMIO
)
2011 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2013 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2020 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2021 ap
->ops
->port_disable(ap
);
2026 static int sata_phy_resume(struct ata_port
*ap
)
2028 unsigned long timeout
= jiffies
+ (HZ
* 5);
2031 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2033 /* Wait for phy to become ready, if necessary. */
2036 sstatus
= scr_read(ap
, SCR_STATUS
);
2037 if ((sstatus
& 0xf) != 1)
2039 } while (time_before(jiffies
, timeout
));
2045 * ata_std_probeinit - initialize probing
2046 * @ap: port to be probed
2048 * @ap is about to be probed. Initialize it. This function is
2049 * to be used as standard callback for ata_drive_probe_reset().
2051 * NOTE!!! Do not use this function as probeinit if a low level
2052 * driver implements only hardreset. Just pass NULL as probeinit
2053 * in that case. Using this function is probably okay but doing
2054 * so makes reset sequence different from the original
2055 * ->phy_reset implementation and Jeff nervous. :-P
2057 extern void ata_std_probeinit(struct ata_port
*ap
)
2059 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2060 sata_phy_resume(ap
);
2061 if (sata_dev_present(ap
))
2062 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2067 * ata_std_softreset - reset host port via ATA SRST
2068 * @ap: port to reset
2069 * @verbose: fail verbosely
2070 * @classes: resulting classes of attached devices
2072 * Reset host port using ATA SRST. This function is to be used
2073 * as standard callback for ata_drive_*_reset() functions.
2076 * Kernel thread context (may sleep)
2079 * 0 on success, -errno otherwise.
2081 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2083 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2084 unsigned int devmask
= 0, err_mask
;
2089 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2090 classes
[0] = ATA_DEV_NONE
;
2094 /* determine if device 0/1 are present */
2095 if (ata_devchk(ap
, 0))
2096 devmask
|= (1 << 0);
2097 if (slave_possible
&& ata_devchk(ap
, 1))
2098 devmask
|= (1 << 1);
2100 /* select device 0 again */
2101 ap
->ops
->dev_select(ap
, 0);
2103 /* issue bus reset */
2104 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2105 err_mask
= ata_bus_softreset(ap
, devmask
);
2108 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2111 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2116 /* determine by signature whether we have ATA or ATAPI devices */
2117 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2118 if (slave_possible
&& err
!= 0x81)
2119 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2122 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2127 * sata_std_hardreset - reset host port via SATA phy reset
2128 * @ap: port to reset
2129 * @verbose: fail verbosely
2130 * @class: resulting class of attached device
2132 * SATA phy-reset host port using DET bits of SControl register.
2133 * This function is to be used as standard callback for
2134 * ata_drive_*_reset().
2137 * Kernel thread context (may sleep)
2140 * 0 on success, -errno otherwise.
2142 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2146 /* Issue phy wake/reset */
2147 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2150 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2151 * 10.4.2 says at least 1 ms.
2155 /* Bring phy back */
2156 sata_phy_resume(ap
);
2158 /* TODO: phy layer with polling, timeouts, etc. */
2159 if (!sata_dev_present(ap
)) {
2160 *class = ATA_DEV_NONE
;
2161 DPRINTK("EXIT, link offline\n");
2165 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2167 printk(KERN_ERR
"ata%u: COMRESET failed "
2168 "(device not ready)\n", ap
->id
);
2170 DPRINTK("EXIT, device not ready\n");
2174 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2176 *class = ata_dev_try_classify(ap
, 0, NULL
);
2178 DPRINTK("EXIT, class=%u\n", *class);
2183 * ata_std_postreset - standard postreset callback
2184 * @ap: the target ata_port
2185 * @classes: classes of attached devices
2187 * This function is invoked after a successful reset. Note that
2188 * the device might have been reset more than once using
2189 * different reset methods before postreset is invoked.
2191 * This function is to be used as standard callback for
2192 * ata_drive_*_reset().
2195 * Kernel thread context (may sleep)
2197 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2201 /* set cable type if it isn't already set */
2202 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2203 ap
->cbl
= ATA_CBL_SATA
;
2205 /* print link status */
2206 if (ap
->cbl
== ATA_CBL_SATA
)
2207 sata_print_link_status(ap
);
2209 /* re-enable interrupts */
2210 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2213 /* is double-select really necessary? */
2214 if (classes
[0] != ATA_DEV_NONE
)
2215 ap
->ops
->dev_select(ap
, 1);
2216 if (classes
[1] != ATA_DEV_NONE
)
2217 ap
->ops
->dev_select(ap
, 0);
2219 /* bail out if no device is present */
2220 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2221 DPRINTK("EXIT, no device\n");
2225 /* set up device control */
2226 if (ap
->ioaddr
.ctl_addr
) {
2227 if (ap
->flags
& ATA_FLAG_MMIO
)
2228 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2230 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2237 * ata_std_probe_reset - standard probe reset method
2238 * @ap: prot to perform probe-reset
2239 * @classes: resulting classes of attached devices
2241 * The stock off-the-shelf ->probe_reset method.
2244 * Kernel thread context (may sleep)
2247 * 0 on success, -errno otherwise.
2249 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2251 ata_reset_fn_t hardreset
;
2254 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2255 hardreset
= sata_std_hardreset
;
2257 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2258 ata_std_softreset
, hardreset
,
2259 ata_std_postreset
, classes
);
2262 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2263 ata_postreset_fn_t postreset
,
2264 unsigned int *classes
)
2268 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2269 classes
[i
] = ATA_DEV_UNKNOWN
;
2271 rc
= reset(ap
, 0, classes
);
2275 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2276 * is complete and convert all ATA_DEV_UNKNOWN to
2279 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2280 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2283 if (i
< ATA_MAX_DEVICES
)
2284 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2285 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2286 classes
[i
] = ATA_DEV_NONE
;
2289 postreset(ap
, classes
);
2291 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2295 * ata_drive_probe_reset - Perform probe reset with given methods
2296 * @ap: port to reset
2297 * @probeinit: probeinit method (can be NULL)
2298 * @softreset: softreset method (can be NULL)
2299 * @hardreset: hardreset method (can be NULL)
2300 * @postreset: postreset method (can be NULL)
2301 * @classes: resulting classes of attached devices
2303 * Reset the specified port and classify attached devices using
2304 * given methods. This function prefers softreset but tries all
2305 * possible reset sequences to reset and classify devices. This
2306 * function is intended to be used for constructing ->probe_reset
2307 * callback by low level drivers.
2309 * Reset methods should follow the following rules.
2311 * - Return 0 on sucess, -errno on failure.
2312 * - If classification is supported, fill classes[] with
2313 * recognized class codes.
2314 * - If classification is not supported, leave classes[] alone.
2315 * - If verbose is non-zero, print error message on failure;
2316 * otherwise, shut up.
2319 * Kernel thread context (may sleep)
2322 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2323 * if classification fails, and any error code from reset
2326 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2327 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2328 ata_postreset_fn_t postreset
, unsigned int *classes
)
2336 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2344 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2345 if (rc
== 0 || rc
!= -ENODEV
)
2349 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2355 * ata_dev_same_device - Determine whether new ID matches configured device
2356 * @ap: port on which the device to compare against resides
2357 * @dev: device to compare against
2358 * @new_class: class of the new device
2359 * @new_id: IDENTIFY page of the new device
2361 * Compare @new_class and @new_id against @dev and determine
2362 * whether @dev is the device indicated by @new_class and
2369 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2371 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2372 unsigned int new_class
, const u16
*new_id
)
2374 const u16
*old_id
= dev
->id
;
2375 unsigned char model
[2][41], serial
[2][21];
2378 if (dev
->class != new_class
) {
2380 "ata%u: dev %u class mismatch %d != %d\n",
2381 ap
->id
, dev
->devno
, dev
->class, new_class
);
2385 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2386 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2387 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2388 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2389 new_n_sectors
= ata_id_n_sectors(new_id
);
2391 if (strcmp(model
[0], model
[1])) {
2393 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2394 ap
->id
, dev
->devno
, model
[0], model
[1]);
2398 if (strcmp(serial
[0], serial
[1])) {
2400 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2401 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2405 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2407 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2408 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2409 (unsigned long long)new_n_sectors
);
2417 * ata_dev_revalidate - Revalidate ATA device
2418 * @ap: port on which the device to revalidate resides
2419 * @dev: device to revalidate
2420 * @post_reset: is this revalidation after reset?
2422 * Re-read IDENTIFY page and make sure @dev is still attached to
2426 * Kernel thread context (may sleep)
2429 * 0 on success, negative errno otherwise
2431 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2438 if (!ata_dev_present(dev
))
2444 /* allocate & read ID data */
2445 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2449 /* is the device still there? */
2450 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2458 /* configure device according to the new ID */
2459 return ata_dev_configure(ap
, dev
, 0);
2462 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2463 ap
->id
, dev
->devno
, rc
);
2468 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2469 const struct ata_device
*dev
)
2471 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2472 ap
->id
, dev
->devno
);
2475 static const char * const ata_dma_blacklist
[] = {
2494 "Toshiba CD-ROM XM-6202B",
2495 "TOSHIBA CD-ROM XM-1702BC",
2497 "E-IDE CD-ROM CR-840",
2500 "SAMSUNG CD-ROM SC-148C",
2501 "SAMSUNG CD-ROM SC",
2503 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2507 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2509 unsigned char model_num
[41];
2512 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2514 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2515 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2521 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2523 const struct ata_device
*master
, *slave
;
2526 master
= &ap
->device
[0];
2527 slave
= &ap
->device
[1];
2529 WARN_ON(!ata_dev_present(master
) && !ata_dev_present(slave
));
2531 if (shift
== ATA_SHIFT_UDMA
) {
2532 mask
= ap
->udma_mask
;
2533 if (ata_dev_present(master
)) {
2534 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2535 if (ata_dma_blacklisted(master
)) {
2537 ata_pr_blacklisted(ap
, master
);
2540 if (ata_dev_present(slave
)) {
2541 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2542 if (ata_dma_blacklisted(slave
)) {
2544 ata_pr_blacklisted(ap
, slave
);
2548 else if (shift
== ATA_SHIFT_MWDMA
) {
2549 mask
= ap
->mwdma_mask
;
2550 if (ata_dev_present(master
)) {
2551 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2552 if (ata_dma_blacklisted(master
)) {
2554 ata_pr_blacklisted(ap
, master
);
2557 if (ata_dev_present(slave
)) {
2558 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2559 if (ata_dma_blacklisted(slave
)) {
2561 ata_pr_blacklisted(ap
, slave
);
2565 else if (shift
== ATA_SHIFT_PIO
) {
2566 mask
= ap
->pio_mask
;
2567 if (ata_dev_present(master
)) {
2568 /* spec doesn't return explicit support for
2569 * PIO0-2, so we fake it
2571 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2576 if (ata_dev_present(slave
)) {
2577 /* spec doesn't return explicit support for
2578 * PIO0-2, so we fake it
2580 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2587 mask
= 0xffffffff; /* shut up compiler warning */
2594 /* find greatest bit */
2595 static int fgb(u32 bitmap
)
2600 for (i
= 0; i
< 32; i
++)
2601 if (bitmap
& (1 << i
))
2608 * ata_choose_xfer_mode - attempt to find best transfer mode
2609 * @ap: Port for which an xfer mode will be selected
2610 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2611 * @xfer_shift_out: (output) bit shift that selects this mode
2613 * Based on host and device capabilities, determine the
2614 * maximum transfer mode that is amenable to all.
2617 * PCI/etc. bus probe sem.
2620 * Zero on success, negative on error.
2623 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2625 unsigned int *xfer_shift_out
)
2627 unsigned int mask
, shift
;
2630 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2631 shift
= xfer_mode_classes
[i
].shift
;
2632 mask
= ata_get_mode_mask(ap
, shift
);
2636 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2637 *xfer_shift_out
= shift
;
2646 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2647 * @ap: Port associated with device @dev
2648 * @dev: Device to which command will be sent
2650 * Issue SET FEATURES - XFER MODE command to device @dev
2654 * PCI/etc. bus probe sem.
2657 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2659 struct ata_taskfile tf
;
2661 /* set up set-features taskfile */
2662 DPRINTK("set features - xfer mode\n");
2664 ata_tf_init(ap
, &tf
, dev
->devno
);
2665 tf
.command
= ATA_CMD_SET_FEATURES
;
2666 tf
.feature
= SETFEATURES_XFER
;
2667 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2668 tf
.protocol
= ATA_PROT_NODATA
;
2669 tf
.nsect
= dev
->xfer_mode
;
2671 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2672 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2674 ata_port_disable(ap
);
2681 * ata_dev_init_params - Issue INIT DEV PARAMS command
2682 * @ap: Port associated with device @dev
2683 * @dev: Device to which command will be sent
2686 * Kernel thread context (may sleep)
2689 * 0 on success, AC_ERR_* mask otherwise.
2692 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2693 struct ata_device
*dev
)
2695 struct ata_taskfile tf
;
2696 unsigned int err_mask
;
2697 u16 sectors
= dev
->id
[6];
2698 u16 heads
= dev
->id
[3];
2700 /* Number of sectors per track 1-255. Number of heads 1-16 */
2701 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2704 /* set up init dev params taskfile */
2705 DPRINTK("init dev params \n");
2707 ata_tf_init(ap
, &tf
, dev
->devno
);
2708 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2709 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2710 tf
.protocol
= ATA_PROT_NODATA
;
2712 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2714 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2716 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2721 * ata_sg_clean - Unmap DMA memory associated with command
2722 * @qc: Command containing DMA memory to be released
2724 * Unmap all mapped DMA memory associated with this command.
2727 * spin_lock_irqsave(host_set lock)
2730 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2732 struct ata_port
*ap
= qc
->ap
;
2733 struct scatterlist
*sg
= qc
->__sg
;
2734 int dir
= qc
->dma_dir
;
2735 void *pad_buf
= NULL
;
2737 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2738 WARN_ON(sg
== NULL
);
2740 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2741 WARN_ON(qc
->n_elem
> 1);
2743 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2745 /* if we padded the buffer out to 32-bit bound, and data
2746 * xfer direction is from-device, we must copy from the
2747 * pad buffer back into the supplied buffer
2749 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2750 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2752 if (qc
->flags
& ATA_QCFLAG_SG
) {
2754 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2755 /* restore last sg */
2756 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2758 struct scatterlist
*psg
= &qc
->pad_sgent
;
2759 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2760 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2761 kunmap_atomic(addr
, KM_IRQ0
);
2765 dma_unmap_single(ap
->host_set
->dev
,
2766 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2769 sg
->length
+= qc
->pad_len
;
2771 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2772 pad_buf
, qc
->pad_len
);
2775 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2780 * ata_fill_sg - Fill PCI IDE PRD table
2781 * @qc: Metadata associated with taskfile to be transferred
2783 * Fill PCI IDE PRD (scatter-gather) table with segments
2784 * associated with the current disk command.
2787 * spin_lock_irqsave(host_set lock)
2790 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2792 struct ata_port
*ap
= qc
->ap
;
2793 struct scatterlist
*sg
;
2796 WARN_ON(qc
->__sg
== NULL
);
2797 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2800 ata_for_each_sg(sg
, qc
) {
2804 /* determine if physical DMA addr spans 64K boundary.
2805 * Note h/w doesn't support 64-bit, so we unconditionally
2806 * truncate dma_addr_t to u32.
2808 addr
= (u32
) sg_dma_address(sg
);
2809 sg_len
= sg_dma_len(sg
);
2812 offset
= addr
& 0xffff;
2814 if ((offset
+ sg_len
) > 0x10000)
2815 len
= 0x10000 - offset
;
2817 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2818 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2819 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2828 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2831 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2832 * @qc: Metadata associated with taskfile to check
2834 * Allow low-level driver to filter ATA PACKET commands, returning
2835 * a status indicating whether or not it is OK to use DMA for the
2836 * supplied PACKET command.
2839 * spin_lock_irqsave(host_set lock)
2841 * RETURNS: 0 when ATAPI DMA can be used
2844 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2846 struct ata_port
*ap
= qc
->ap
;
2847 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2849 if (ap
->ops
->check_atapi_dma
)
2850 rc
= ap
->ops
->check_atapi_dma(qc
);
2855 * ata_qc_prep - Prepare taskfile for submission
2856 * @qc: Metadata associated with taskfile to be prepared
2858 * Prepare ATA taskfile for submission.
2861 * spin_lock_irqsave(host_set lock)
2863 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2865 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2872 * ata_sg_init_one - Associate command with memory buffer
2873 * @qc: Command to be associated
2874 * @buf: Memory buffer
2875 * @buflen: Length of memory buffer, in bytes.
2877 * Initialize the data-related elements of queued_cmd @qc
2878 * to point to a single memory buffer, @buf of byte length @buflen.
2881 * spin_lock_irqsave(host_set lock)
2884 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2886 struct scatterlist
*sg
;
2888 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2890 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2891 qc
->__sg
= &qc
->sgent
;
2893 qc
->orig_n_elem
= 1;
2897 sg_init_one(sg
, buf
, buflen
);
2901 * ata_sg_init - Associate command with scatter-gather table.
2902 * @qc: Command to be associated
2903 * @sg: Scatter-gather table.
2904 * @n_elem: Number of elements in s/g table.
2906 * Initialize the data-related elements of queued_cmd @qc
2907 * to point to a scatter-gather table @sg, containing @n_elem
2911 * spin_lock_irqsave(host_set lock)
2914 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2915 unsigned int n_elem
)
2917 qc
->flags
|= ATA_QCFLAG_SG
;
2919 qc
->n_elem
= n_elem
;
2920 qc
->orig_n_elem
= n_elem
;
2924 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2925 * @qc: Command with memory buffer to be mapped.
2927 * DMA-map the memory buffer associated with queued_cmd @qc.
2930 * spin_lock_irqsave(host_set lock)
2933 * Zero on success, negative on error.
2936 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2938 struct ata_port
*ap
= qc
->ap
;
2939 int dir
= qc
->dma_dir
;
2940 struct scatterlist
*sg
= qc
->__sg
;
2941 dma_addr_t dma_address
;
2944 /* we must lengthen transfers to end on a 32-bit boundary */
2945 qc
->pad_len
= sg
->length
& 3;
2947 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2948 struct scatterlist
*psg
= &qc
->pad_sgent
;
2950 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2952 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2954 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2955 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2958 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2959 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2961 sg
->length
-= qc
->pad_len
;
2962 if (sg
->length
== 0)
2965 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2966 sg
->length
, qc
->pad_len
);
2974 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2976 if (dma_mapping_error(dma_address
)) {
2978 sg
->length
+= qc
->pad_len
;
2982 sg_dma_address(sg
) = dma_address
;
2983 sg_dma_len(sg
) = sg
->length
;
2986 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2987 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2993 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2994 * @qc: Command with scatter-gather table to be mapped.
2996 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2999 * spin_lock_irqsave(host_set lock)
3002 * Zero on success, negative on error.
3006 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3008 struct ata_port
*ap
= qc
->ap
;
3009 struct scatterlist
*sg
= qc
->__sg
;
3010 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3011 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3013 VPRINTK("ENTER, ata%u\n", ap
->id
);
3014 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3016 /* we must lengthen transfers to end on a 32-bit boundary */
3017 qc
->pad_len
= lsg
->length
& 3;
3019 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3020 struct scatterlist
*psg
= &qc
->pad_sgent
;
3021 unsigned int offset
;
3023 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3025 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3028 * psg->page/offset are used to copy to-be-written
3029 * data in this function or read data in ata_sg_clean.
3031 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3032 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3033 psg
->offset
= offset_in_page(offset
);
3035 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3036 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3037 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3038 kunmap_atomic(addr
, KM_IRQ0
);
3041 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3042 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3044 lsg
->length
-= qc
->pad_len
;
3045 if (lsg
->length
== 0)
3048 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3049 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3052 pre_n_elem
= qc
->n_elem
;
3053 if (trim_sg
&& pre_n_elem
)
3062 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
3064 /* restore last sg */
3065 lsg
->length
+= qc
->pad_len
;
3069 DPRINTK("%d sg elements mapped\n", n_elem
);
3072 qc
->n_elem
= n_elem
;
3078 * ata_poll_qc_complete - turn irq back on and finish qc
3079 * @qc: Command to complete
3080 * @err_mask: ATA status register content
3083 * None. (grabs host lock)
3086 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3088 struct ata_port
*ap
= qc
->ap
;
3089 unsigned long flags
;
3091 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3092 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3094 ata_qc_complete(qc
);
3095 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3099 * ata_pio_poll - poll using PIO, depending on current state
3100 * @ap: the target ata_port
3103 * None. (executing in kernel thread context)
3106 * timeout value to use
3109 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3111 struct ata_queued_cmd
*qc
;
3113 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3114 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3116 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3117 WARN_ON(qc
== NULL
);
3119 switch (ap
->hsm_task_state
) {
3122 poll_state
= HSM_ST_POLL
;
3126 case HSM_ST_LAST_POLL
:
3127 poll_state
= HSM_ST_LAST_POLL
;
3128 reg_state
= HSM_ST_LAST
;
3135 status
= ata_chk_status(ap
);
3136 if (status
& ATA_BUSY
) {
3137 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3138 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3139 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3142 ap
->hsm_task_state
= poll_state
;
3143 return ATA_SHORT_PAUSE
;
3146 ap
->hsm_task_state
= reg_state
;
3151 * ata_pio_complete - check if drive is busy or idle
3152 * @ap: the target ata_port
3155 * None. (executing in kernel thread context)
3158 * Non-zero if qc completed, zero otherwise.
3161 static int ata_pio_complete (struct ata_port
*ap
)
3163 struct ata_queued_cmd
*qc
;
3167 * This is purely heuristic. This is a fast path. Sometimes when
3168 * we enter, BSY will be cleared in a chk-status or two. If not,
3169 * the drive is probably seeking or something. Snooze for a couple
3170 * msecs, then chk-status again. If still busy, fall back to
3171 * HSM_ST_POLL state.
3173 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3174 if (drv_stat
& ATA_BUSY
) {
3176 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3177 if (drv_stat
& ATA_BUSY
) {
3178 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3179 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3184 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3185 WARN_ON(qc
== NULL
);
3187 drv_stat
= ata_wait_idle(ap
);
3188 if (!ata_ok(drv_stat
)) {
3189 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3190 ap
->hsm_task_state
= HSM_ST_ERR
;
3194 ap
->hsm_task_state
= HSM_ST_IDLE
;
3196 WARN_ON(qc
->err_mask
);
3197 ata_poll_qc_complete(qc
);
3199 /* another command may start at this point */
3206 * swap_buf_le16 - swap halves of 16-bit words in place
3207 * @buf: Buffer to swap
3208 * @buf_words: Number of 16-bit words in buffer.
3210 * Swap halves of 16-bit words if needed to convert from
3211 * little-endian byte order to native cpu byte order, or
3215 * Inherited from caller.
3217 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3222 for (i
= 0; i
< buf_words
; i
++)
3223 buf
[i
] = le16_to_cpu(buf
[i
]);
3224 #endif /* __BIG_ENDIAN */
3228 * ata_mmio_data_xfer - Transfer data by MMIO
3229 * @ap: port to read/write
3231 * @buflen: buffer length
3232 * @write_data: read/write
3234 * Transfer data from/to the device data register by MMIO.
3237 * Inherited from caller.
3240 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3241 unsigned int buflen
, int write_data
)
3244 unsigned int words
= buflen
>> 1;
3245 u16
*buf16
= (u16
*) buf
;
3246 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3248 /* Transfer multiple of 2 bytes */
3250 for (i
= 0; i
< words
; i
++)
3251 writew(le16_to_cpu(buf16
[i
]), mmio
);
3253 for (i
= 0; i
< words
; i
++)
3254 buf16
[i
] = cpu_to_le16(readw(mmio
));
3257 /* Transfer trailing 1 byte, if any. */
3258 if (unlikely(buflen
& 0x01)) {
3259 u16 align_buf
[1] = { 0 };
3260 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3263 memcpy(align_buf
, trailing_buf
, 1);
3264 writew(le16_to_cpu(align_buf
[0]), mmio
);
3266 align_buf
[0] = cpu_to_le16(readw(mmio
));
3267 memcpy(trailing_buf
, align_buf
, 1);
3273 * ata_pio_data_xfer - Transfer data by PIO
3274 * @ap: port to read/write
3276 * @buflen: buffer length
3277 * @write_data: read/write
3279 * Transfer data from/to the device data register by PIO.
3282 * Inherited from caller.
3285 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3286 unsigned int buflen
, int write_data
)
3288 unsigned int words
= buflen
>> 1;
3290 /* Transfer multiple of 2 bytes */
3292 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3294 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3296 /* Transfer trailing 1 byte, if any. */
3297 if (unlikely(buflen
& 0x01)) {
3298 u16 align_buf
[1] = { 0 };
3299 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3302 memcpy(align_buf
, trailing_buf
, 1);
3303 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3305 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3306 memcpy(trailing_buf
, align_buf
, 1);
3312 * ata_data_xfer - Transfer data from/to the data register.
3313 * @ap: port to read/write
3315 * @buflen: buffer length
3316 * @do_write: read/write
3318 * Transfer data from/to the device data register.
3321 * Inherited from caller.
3324 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3325 unsigned int buflen
, int do_write
)
3327 /* Make the crap hardware pay the costs not the good stuff */
3328 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3329 unsigned long flags
;
3330 local_irq_save(flags
);
3331 if (ap
->flags
& ATA_FLAG_MMIO
)
3332 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3334 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3335 local_irq_restore(flags
);
3337 if (ap
->flags
& ATA_FLAG_MMIO
)
3338 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3340 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3345 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3346 * @qc: Command on going
3348 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3351 * Inherited from caller.
3354 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3356 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3357 struct scatterlist
*sg
= qc
->__sg
;
3358 struct ata_port
*ap
= qc
->ap
;
3360 unsigned int offset
;
3363 if (qc
->cursect
== (qc
->nsect
- 1))
3364 ap
->hsm_task_state
= HSM_ST_LAST
;
3366 page
= sg
[qc
->cursg
].page
;
3367 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3369 /* get the current page and offset */
3370 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3371 offset
%= PAGE_SIZE
;
3373 buf
= kmap(page
) + offset
;
3378 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3383 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3385 /* do the actual data transfer */
3386 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3387 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3393 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3394 * @qc: Command on going
3395 * @bytes: number of bytes
3397 * Transfer Transfer data from/to the ATAPI device.
3400 * Inherited from caller.
3404 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3406 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3407 struct scatterlist
*sg
= qc
->__sg
;
3408 struct ata_port
*ap
= qc
->ap
;
3411 unsigned int offset
, count
;
3413 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3414 ap
->hsm_task_state
= HSM_ST_LAST
;
3417 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3419 * The end of qc->sg is reached and the device expects
3420 * more data to transfer. In order not to overrun qc->sg
3421 * and fulfill length specified in the byte count register,
3422 * - for read case, discard trailing data from the device
3423 * - for write case, padding zero data to the device
3425 u16 pad_buf
[1] = { 0 };
3426 unsigned int words
= bytes
>> 1;
3429 if (words
) /* warning if bytes > 1 */
3430 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3433 for (i
= 0; i
< words
; i
++)
3434 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3436 ap
->hsm_task_state
= HSM_ST_LAST
;
3440 sg
= &qc
->__sg
[qc
->cursg
];
3443 offset
= sg
->offset
+ qc
->cursg_ofs
;
3445 /* get the current page and offset */
3446 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3447 offset
%= PAGE_SIZE
;
3449 /* don't overrun current sg */
3450 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3452 /* don't cross page boundaries */
3453 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3455 buf
= kmap(page
) + offset
;
3458 qc
->curbytes
+= count
;
3459 qc
->cursg_ofs
+= count
;
3461 if (qc
->cursg_ofs
== sg
->length
) {
3466 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3468 /* do the actual data transfer */
3469 ata_data_xfer(ap
, buf
, count
, do_write
);
3478 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3479 * @qc: Command on going
3481 * Transfer Transfer data from/to the ATAPI device.
3484 * Inherited from caller.
3487 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3489 struct ata_port
*ap
= qc
->ap
;
3490 struct ata_device
*dev
= qc
->dev
;
3491 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3492 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3494 ap
->ops
->tf_read(ap
, &qc
->tf
);
3495 ireason
= qc
->tf
.nsect
;
3496 bc_lo
= qc
->tf
.lbam
;
3497 bc_hi
= qc
->tf
.lbah
;
3498 bytes
= (bc_hi
<< 8) | bc_lo
;
3500 /* shall be cleared to zero, indicating xfer of data */
3501 if (ireason
& (1 << 0))
3504 /* make sure transfer direction matches expected */
3505 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3506 if (do_write
!= i_write
)
3509 __atapi_pio_bytes(qc
, bytes
);
3514 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3515 ap
->id
, dev
->devno
);
3516 qc
->err_mask
|= AC_ERR_HSM
;
3517 ap
->hsm_task_state
= HSM_ST_ERR
;
3521 * ata_pio_block - start PIO on a block
3522 * @ap: the target ata_port
3525 * None. (executing in kernel thread context)
3528 static void ata_pio_block(struct ata_port
*ap
)
3530 struct ata_queued_cmd
*qc
;
3534 * This is purely heuristic. This is a fast path.
3535 * Sometimes when we enter, BSY will be cleared in
3536 * a chk-status or two. If not, the drive is probably seeking
3537 * or something. Snooze for a couple msecs, then
3538 * chk-status again. If still busy, fall back to
3539 * HSM_ST_POLL state.
3541 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3542 if (status
& ATA_BUSY
) {
3544 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3545 if (status
& ATA_BUSY
) {
3546 ap
->hsm_task_state
= HSM_ST_POLL
;
3547 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3552 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3553 WARN_ON(qc
== NULL
);
3556 if (status
& (ATA_ERR
| ATA_DF
)) {
3557 qc
->err_mask
|= AC_ERR_DEV
;
3558 ap
->hsm_task_state
= HSM_ST_ERR
;
3562 /* transfer data if any */
3563 if (is_atapi_taskfile(&qc
->tf
)) {
3564 /* DRQ=0 means no more data to transfer */
3565 if ((status
& ATA_DRQ
) == 0) {
3566 ap
->hsm_task_state
= HSM_ST_LAST
;
3570 atapi_pio_bytes(qc
);
3572 /* handle BSY=0, DRQ=0 as error */
3573 if ((status
& ATA_DRQ
) == 0) {
3574 qc
->err_mask
|= AC_ERR_HSM
;
3575 ap
->hsm_task_state
= HSM_ST_ERR
;
3583 static void ata_pio_error(struct ata_port
*ap
)
3585 struct ata_queued_cmd
*qc
;
3587 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3588 WARN_ON(qc
== NULL
);
3590 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3591 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3593 /* make sure qc->err_mask is available to
3594 * know what's wrong and recover
3596 WARN_ON(qc
->err_mask
== 0);
3598 ap
->hsm_task_state
= HSM_ST_IDLE
;
3600 ata_poll_qc_complete(qc
);
3603 static void ata_pio_task(void *_data
)
3605 struct ata_port
*ap
= _data
;
3606 unsigned long timeout
;
3613 switch (ap
->hsm_task_state
) {
3622 qc_completed
= ata_pio_complete(ap
);
3626 case HSM_ST_LAST_POLL
:
3627 timeout
= ata_pio_poll(ap
);
3637 ata_queue_delayed_pio_task(ap
, timeout
);
3638 else if (!qc_completed
)
3643 * ata_qc_timeout - Handle timeout of queued command
3644 * @qc: Command that timed out
3646 * Some part of the kernel (currently, only the SCSI layer)
3647 * has noticed that the active command on port @ap has not
3648 * completed after a specified length of time. Handle this
3649 * condition by disabling DMA (if necessary) and completing
3650 * transactions, with error if necessary.
3652 * This also handles the case of the "lost interrupt", where
3653 * for some reason (possibly hardware bug, possibly driver bug)
3654 * an interrupt was not delivered to the driver, even though the
3655 * transaction completed successfully.
3658 * Inherited from SCSI layer (none, can sleep)
3661 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3663 struct ata_port
*ap
= qc
->ap
;
3664 struct ata_host_set
*host_set
= ap
->host_set
;
3665 u8 host_stat
= 0, drv_stat
;
3666 unsigned long flags
;
3670 ata_flush_pio_tasks(ap
);
3671 ap
->hsm_task_state
= HSM_ST_IDLE
;
3673 spin_lock_irqsave(&host_set
->lock
, flags
);
3675 switch (qc
->tf
.protocol
) {
3678 case ATA_PROT_ATAPI_DMA
:
3679 host_stat
= ap
->ops
->bmdma_status(ap
);
3681 /* before we do anything else, clear DMA-Start bit */
3682 ap
->ops
->bmdma_stop(qc
);
3688 drv_stat
= ata_chk_status(ap
);
3690 /* ack bmdma irq events */
3691 ap
->ops
->irq_clear(ap
);
3693 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3694 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3696 /* complete taskfile transaction */
3697 qc
->err_mask
|= ac_err_mask(drv_stat
);
3701 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3703 ata_eh_qc_complete(qc
);
3709 * ata_eng_timeout - Handle timeout of queued command
3710 * @ap: Port on which timed-out command is active
3712 * Some part of the kernel (currently, only the SCSI layer)
3713 * has noticed that the active command on port @ap has not
3714 * completed after a specified length of time. Handle this
3715 * condition by disabling DMA (if necessary) and completing
3716 * transactions, with error if necessary.
3718 * This also handles the case of the "lost interrupt", where
3719 * for some reason (possibly hardware bug, possibly driver bug)
3720 * an interrupt was not delivered to the driver, even though the
3721 * transaction completed successfully.
3724 * Inherited from SCSI layer (none, can sleep)
3727 void ata_eng_timeout(struct ata_port
*ap
)
3731 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3737 * ata_qc_new - Request an available ATA command, for queueing
3738 * @ap: Port associated with device @dev
3739 * @dev: Device from whom we request an available command structure
3745 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3747 struct ata_queued_cmd
*qc
= NULL
;
3750 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3751 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3752 qc
= ata_qc_from_tag(ap
, i
);
3763 * ata_qc_new_init - Request an available ATA command, and initialize it
3764 * @ap: Port associated with device @dev
3765 * @dev: Device from whom we request an available command structure
3771 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3772 struct ata_device
*dev
)
3774 struct ata_queued_cmd
*qc
;
3776 qc
= ata_qc_new(ap
);
3789 * ata_qc_free - free unused ata_queued_cmd
3790 * @qc: Command to complete
3792 * Designed to free unused ata_queued_cmd object
3793 * in case something prevents using it.
3796 * spin_lock_irqsave(host_set lock)
3798 void ata_qc_free(struct ata_queued_cmd
*qc
)
3800 struct ata_port
*ap
= qc
->ap
;
3803 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3807 if (likely(ata_tag_valid(tag
))) {
3808 if (tag
== ap
->active_tag
)
3809 ap
->active_tag
= ATA_TAG_POISON
;
3810 qc
->tag
= ATA_TAG_POISON
;
3811 clear_bit(tag
, &ap
->qactive
);
3815 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3817 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3818 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3820 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3823 /* atapi: mark qc as inactive to prevent the interrupt handler
3824 * from completing the command twice later, before the error handler
3825 * is called. (when rc != 0 and atapi request sense is needed)
3827 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3829 /* call completion callback */
3830 qc
->complete_fn(qc
);
3833 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3835 struct ata_port
*ap
= qc
->ap
;
3837 switch (qc
->tf
.protocol
) {
3839 case ATA_PROT_ATAPI_DMA
:
3842 case ATA_PROT_ATAPI
:
3844 case ATA_PROT_PIO_MULT
:
3845 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3858 * ata_qc_issue - issue taskfile to device
3859 * @qc: command to issue to device
3861 * Prepare an ATA command to submission to device.
3862 * This includes mapping the data into a DMA-able
3863 * area, filling in the S/G table, and finally
3864 * writing the taskfile to hardware, starting the command.
3867 * spin_lock_irqsave(host_set lock)
3870 * Zero on success, AC_ERR_* mask on failure
3873 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3875 struct ata_port
*ap
= qc
->ap
;
3877 if (ata_should_dma_map(qc
)) {
3878 if (qc
->flags
& ATA_QCFLAG_SG
) {
3879 if (ata_sg_setup(qc
))
3881 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3882 if (ata_sg_setup_one(qc
))
3886 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3889 ap
->ops
->qc_prep(qc
);
3891 qc
->ap
->active_tag
= qc
->tag
;
3892 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3894 return ap
->ops
->qc_issue(qc
);
3897 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3898 return AC_ERR_SYSTEM
;
3903 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3904 * @qc: command to issue to device
3906 * Using various libata functions and hooks, this function
3907 * starts an ATA command. ATA commands are grouped into
3908 * classes called "protocols", and issuing each type of protocol
3909 * is slightly different.
3911 * May be used as the qc_issue() entry in ata_port_operations.
3914 * spin_lock_irqsave(host_set lock)
3917 * Zero on success, AC_ERR_* mask on failure
3920 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3922 struct ata_port
*ap
= qc
->ap
;
3924 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3926 switch (qc
->tf
.protocol
) {
3927 case ATA_PROT_NODATA
:
3928 ata_tf_to_host(ap
, &qc
->tf
);
3932 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3933 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3934 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3937 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3938 ata_qc_set_polling(qc
);
3939 ata_tf_to_host(ap
, &qc
->tf
);
3940 ap
->hsm_task_state
= HSM_ST
;
3941 ata_queue_pio_task(ap
);
3944 case ATA_PROT_ATAPI
:
3945 ata_qc_set_polling(qc
);
3946 ata_tf_to_host(ap
, &qc
->tf
);
3947 ata_queue_packet_task(ap
);
3950 case ATA_PROT_ATAPI_NODATA
:
3951 ap
->flags
|= ATA_FLAG_NOINTR
;
3952 ata_tf_to_host(ap
, &qc
->tf
);
3953 ata_queue_packet_task(ap
);
3956 case ATA_PROT_ATAPI_DMA
:
3957 ap
->flags
|= ATA_FLAG_NOINTR
;
3958 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3959 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3960 ata_queue_packet_task(ap
);
3965 return AC_ERR_SYSTEM
;
3972 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3973 * @qc: Info associated with this ATA transaction.
3976 * spin_lock_irqsave(host_set lock)
3979 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3981 struct ata_port
*ap
= qc
->ap
;
3982 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3984 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3986 /* load PRD table addr. */
3987 mb(); /* make sure PRD table writes are visible to controller */
3988 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3990 /* specify data direction, triple-check start bit is clear */
3991 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3992 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3994 dmactl
|= ATA_DMA_WR
;
3995 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3997 /* issue r/w command */
3998 ap
->ops
->exec_command(ap
, &qc
->tf
);
4002 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4003 * @qc: Info associated with this ATA transaction.
4006 * spin_lock_irqsave(host_set lock)
4009 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4011 struct ata_port
*ap
= qc
->ap
;
4012 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4015 /* start host DMA transaction */
4016 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4017 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4019 /* Strictly, one may wish to issue a readb() here, to
4020 * flush the mmio write. However, control also passes
4021 * to the hardware at this point, and it will interrupt
4022 * us when we are to resume control. So, in effect,
4023 * we don't care when the mmio write flushes.
4024 * Further, a read of the DMA status register _immediately_
4025 * following the write may not be what certain flaky hardware
4026 * is expected, so I think it is best to not add a readb()
4027 * without first all the MMIO ATA cards/mobos.
4028 * Or maybe I'm just being paranoid.
4033 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4034 * @qc: Info associated with this ATA transaction.
4037 * spin_lock_irqsave(host_set lock)
4040 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4042 struct ata_port
*ap
= qc
->ap
;
4043 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4046 /* load PRD table addr. */
4047 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4049 /* specify data direction, triple-check start bit is clear */
4050 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4051 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4053 dmactl
|= ATA_DMA_WR
;
4054 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4056 /* issue r/w command */
4057 ap
->ops
->exec_command(ap
, &qc
->tf
);
4061 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4062 * @qc: Info associated with this ATA transaction.
4065 * spin_lock_irqsave(host_set lock)
4068 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4070 struct ata_port
*ap
= qc
->ap
;
4073 /* start host DMA transaction */
4074 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4075 outb(dmactl
| ATA_DMA_START
,
4076 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4081 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4082 * @qc: Info associated with this ATA transaction.
4084 * Writes the ATA_DMA_START flag to the DMA command register.
4086 * May be used as the bmdma_start() entry in ata_port_operations.
4089 * spin_lock_irqsave(host_set lock)
4091 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4093 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4094 ata_bmdma_start_mmio(qc
);
4096 ata_bmdma_start_pio(qc
);
4101 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4102 * @qc: Info associated with this ATA transaction.
4104 * Writes address of PRD table to device's PRD Table Address
4105 * register, sets the DMA control register, and calls
4106 * ops->exec_command() to start the transfer.
4108 * May be used as the bmdma_setup() entry in ata_port_operations.
4111 * spin_lock_irqsave(host_set lock)
4113 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4115 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4116 ata_bmdma_setup_mmio(qc
);
4118 ata_bmdma_setup_pio(qc
);
4123 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4124 * @ap: Port associated with this ATA transaction.
4126 * Clear interrupt and error flags in DMA status register.
4128 * May be used as the irq_clear() entry in ata_port_operations.
4131 * spin_lock_irqsave(host_set lock)
4134 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4136 if (ap
->flags
& ATA_FLAG_MMIO
) {
4137 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4138 writeb(readb(mmio
), mmio
);
4140 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4141 outb(inb(addr
), addr
);
4148 * ata_bmdma_status - Read PCI IDE BMDMA status
4149 * @ap: Port associated with this ATA transaction.
4151 * Read and return BMDMA status register.
4153 * May be used as the bmdma_status() entry in ata_port_operations.
4156 * spin_lock_irqsave(host_set lock)
4159 u8
ata_bmdma_status(struct ata_port
*ap
)
4162 if (ap
->flags
& ATA_FLAG_MMIO
) {
4163 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4164 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4166 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4172 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4173 * @qc: Command we are ending DMA for
4175 * Clears the ATA_DMA_START flag in the dma control register
4177 * May be used as the bmdma_stop() entry in ata_port_operations.
4180 * spin_lock_irqsave(host_set lock)
4183 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4185 struct ata_port
*ap
= qc
->ap
;
4186 if (ap
->flags
& ATA_FLAG_MMIO
) {
4187 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4189 /* clear start/stop bit */
4190 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4191 mmio
+ ATA_DMA_CMD
);
4193 /* clear start/stop bit */
4194 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4195 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4198 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4199 ata_altstatus(ap
); /* dummy read */
4203 * ata_host_intr - Handle host interrupt for given (port, task)
4204 * @ap: Port on which interrupt arrived (possibly...)
4205 * @qc: Taskfile currently active in engine
4207 * Handle host interrupt for given queued command. Currently,
4208 * only DMA interrupts are handled. All other commands are
4209 * handled via polling with interrupts disabled (nIEN bit).
4212 * spin_lock_irqsave(host_set lock)
4215 * One if interrupt was handled, zero if not (shared irq).
4218 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4219 struct ata_queued_cmd
*qc
)
4221 u8 status
, host_stat
;
4223 switch (qc
->tf
.protocol
) {
4226 case ATA_PROT_ATAPI_DMA
:
4227 case ATA_PROT_ATAPI
:
4228 /* check status of DMA engine */
4229 host_stat
= ap
->ops
->bmdma_status(ap
);
4230 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4232 /* if it's not our irq... */
4233 if (!(host_stat
& ATA_DMA_INTR
))
4236 /* before we do anything else, clear DMA-Start bit */
4237 ap
->ops
->bmdma_stop(qc
);
4241 case ATA_PROT_ATAPI_NODATA
:
4242 case ATA_PROT_NODATA
:
4243 /* check altstatus */
4244 status
= ata_altstatus(ap
);
4245 if (status
& ATA_BUSY
)
4248 /* check main status, clearing INTRQ */
4249 status
= ata_chk_status(ap
);
4250 if (unlikely(status
& ATA_BUSY
))
4252 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4253 ap
->id
, qc
->tf
.protocol
, status
);
4255 /* ack bmdma irq events */
4256 ap
->ops
->irq_clear(ap
);
4258 /* complete taskfile transaction */
4259 qc
->err_mask
|= ac_err_mask(status
);
4260 ata_qc_complete(qc
);
4267 return 1; /* irq handled */
4270 ap
->stats
.idle_irq
++;
4273 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4275 ata_irq_ack(ap
, 0); /* debug trap */
4276 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4279 return 0; /* irq not handled */
4283 * ata_interrupt - Default ATA host interrupt handler
4284 * @irq: irq line (unused)
4285 * @dev_instance: pointer to our ata_host_set information structure
4288 * Default interrupt handler for PCI IDE devices. Calls
4289 * ata_host_intr() for each port that is not disabled.
4292 * Obtains host_set lock during operation.
4295 * IRQ_NONE or IRQ_HANDLED.
4298 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4300 struct ata_host_set
*host_set
= dev_instance
;
4302 unsigned int handled
= 0;
4303 unsigned long flags
;
4305 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4306 spin_lock_irqsave(&host_set
->lock
, flags
);
4308 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4309 struct ata_port
*ap
;
4311 ap
= host_set
->ports
[i
];
4313 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4314 struct ata_queued_cmd
*qc
;
4316 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4317 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4318 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4319 handled
|= ata_host_intr(ap
, qc
);
4323 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4325 return IRQ_RETVAL(handled
);
4329 * atapi_packet_task - Write CDB bytes to hardware
4330 * @_data: Port to which ATAPI device is attached.
4332 * When device has indicated its readiness to accept
4333 * a CDB, this function is called. Send the CDB.
4334 * If DMA is to be performed, exit immediately.
4335 * Otherwise, we are in polling mode, so poll
4336 * status under operation succeeds or fails.
4339 * Kernel thread context (may sleep)
4342 static void atapi_packet_task(void *_data
)
4344 struct ata_port
*ap
= _data
;
4345 struct ata_queued_cmd
*qc
;
4348 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4349 WARN_ON(qc
== NULL
);
4350 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4352 /* sleep-wait for BSY to clear */
4353 DPRINTK("busy wait\n");
4354 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4355 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4359 /* make sure DRQ is set */
4360 status
= ata_chk_status(ap
);
4361 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4362 qc
->err_mask
|= AC_ERR_HSM
;
4367 DPRINTK("send cdb\n");
4368 WARN_ON(qc
->dev
->cdb_len
< 12);
4370 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4371 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4372 unsigned long flags
;
4374 /* Once we're done issuing command and kicking bmdma,
4375 * irq handler takes over. To not lose irq, we need
4376 * to clear NOINTR flag before sending cdb, but
4377 * interrupt handler shouldn't be invoked before we're
4378 * finished. Hence, the following locking.
4380 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4381 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4382 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4383 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4384 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4385 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4387 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4389 /* PIO commands are handled by polling */
4390 ap
->hsm_task_state
= HSM_ST
;
4391 ata_queue_pio_task(ap
);
4397 ata_poll_qc_complete(qc
);
4402 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4403 * without filling any other registers
4405 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4408 struct ata_taskfile tf
;
4411 ata_tf_init(ap
, &tf
, dev
->devno
);
4414 tf
.flags
|= ATA_TFLAG_DEVICE
;
4415 tf
.protocol
= ATA_PROT_NODATA
;
4417 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4419 printk(KERN_ERR
"%s: ata command failed: %d\n",
4425 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4429 if (!ata_try_flush_cache(dev
))
4432 if (ata_id_has_flush_ext(dev
->id
))
4433 cmd
= ATA_CMD_FLUSH_EXT
;
4435 cmd
= ATA_CMD_FLUSH
;
4437 return ata_do_simple_cmd(ap
, dev
, cmd
);
4440 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4442 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4445 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4447 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4451 * ata_device_resume - wakeup a previously suspended devices
4452 * @ap: port the device is connected to
4453 * @dev: the device to resume
4455 * Kick the drive back into action, by sending it an idle immediate
4456 * command and making sure its transfer mode matches between drive
4460 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4462 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4463 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4466 if (!ata_dev_present(dev
))
4468 if (dev
->class == ATA_DEV_ATA
)
4469 ata_start_drive(ap
, dev
);
4475 * ata_device_suspend - prepare a device for suspend
4476 * @ap: port the device is connected to
4477 * @dev: the device to suspend
4479 * Flush the cache on the drive, if appropriate, then issue a
4480 * standbynow command.
4482 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4484 if (!ata_dev_present(dev
))
4486 if (dev
->class == ATA_DEV_ATA
)
4487 ata_flush_cache(ap
, dev
);
4489 ata_standby_drive(ap
, dev
);
4490 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4495 * ata_port_start - Set port up for dma.
4496 * @ap: Port to initialize
4498 * Called just after data structures for each port are
4499 * initialized. Allocates space for PRD table.
4501 * May be used as the port_start() entry in ata_port_operations.
4504 * Inherited from caller.
4507 int ata_port_start (struct ata_port
*ap
)
4509 struct device
*dev
= ap
->host_set
->dev
;
4512 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4516 rc
= ata_pad_alloc(ap
, dev
);
4518 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4522 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4529 * ata_port_stop - Undo ata_port_start()
4530 * @ap: Port to shut down
4532 * Frees the PRD table.
4534 * May be used as the port_stop() entry in ata_port_operations.
4537 * Inherited from caller.
4540 void ata_port_stop (struct ata_port
*ap
)
4542 struct device
*dev
= ap
->host_set
->dev
;
4544 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4545 ata_pad_free(ap
, dev
);
4548 void ata_host_stop (struct ata_host_set
*host_set
)
4550 if (host_set
->mmio_base
)
4551 iounmap(host_set
->mmio_base
);
4556 * ata_host_remove - Unregister SCSI host structure with upper layers
4557 * @ap: Port to unregister
4558 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4561 * Inherited from caller.
4564 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4566 struct Scsi_Host
*sh
= ap
->host
;
4571 scsi_remove_host(sh
);
4573 ap
->ops
->port_stop(ap
);
4577 * ata_host_init - Initialize an ata_port structure
4578 * @ap: Structure to initialize
4579 * @host: associated SCSI mid-layer structure
4580 * @host_set: Collection of hosts to which @ap belongs
4581 * @ent: Probe information provided by low-level driver
4582 * @port_no: Port number associated with this ata_port
4584 * Initialize a new ata_port structure, and its associated
4588 * Inherited from caller.
4591 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4592 struct ata_host_set
*host_set
,
4593 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4599 host
->max_channel
= 1;
4600 host
->unique_id
= ata_unique_id
++;
4601 host
->max_cmd_len
= 12;
4603 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4604 ap
->id
= host
->unique_id
;
4606 ap
->ctl
= ATA_DEVCTL_OBS
;
4607 ap
->host_set
= host_set
;
4608 ap
->port_no
= port_no
;
4610 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4611 ap
->pio_mask
= ent
->pio_mask
;
4612 ap
->mwdma_mask
= ent
->mwdma_mask
;
4613 ap
->udma_mask
= ent
->udma_mask
;
4614 ap
->flags
|= ent
->host_flags
;
4615 ap
->ops
= ent
->port_ops
;
4616 ap
->cbl
= ATA_CBL_NONE
;
4617 ap
->active_tag
= ATA_TAG_POISON
;
4618 ap
->last_ctl
= 0xFF;
4620 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4621 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4622 INIT_LIST_HEAD(&ap
->eh_done_q
);
4624 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4625 ap
->device
[i
].devno
= i
;
4628 ap
->stats
.unhandled_irq
= 1;
4629 ap
->stats
.idle_irq
= 1;
4632 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4636 * ata_host_add - Attach low-level ATA driver to system
4637 * @ent: Information provided by low-level driver
4638 * @host_set: Collections of ports to which we add
4639 * @port_no: Port number associated with this host
4641 * Attach low-level ATA driver to system.
4644 * PCI/etc. bus probe sem.
4647 * New ata_port on success, for NULL on error.
4650 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4651 struct ata_host_set
*host_set
,
4652 unsigned int port_no
)
4654 struct Scsi_Host
*host
;
4655 struct ata_port
*ap
;
4659 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4663 ap
= (struct ata_port
*) &host
->hostdata
[0];
4665 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4667 rc
= ap
->ops
->port_start(ap
);
4674 scsi_host_put(host
);
4679 * ata_device_add - Register hardware device with ATA and SCSI layers
4680 * @ent: Probe information describing hardware device to be registered
4682 * This function processes the information provided in the probe
4683 * information struct @ent, allocates the necessary ATA and SCSI
4684 * host information structures, initializes them, and registers
4685 * everything with requisite kernel subsystems.
4687 * This function requests irqs, probes the ATA bus, and probes
4691 * PCI/etc. bus probe sem.
4694 * Number of ports registered. Zero on error (no ports registered).
4697 int ata_device_add(const struct ata_probe_ent
*ent
)
4699 unsigned int count
= 0, i
;
4700 struct device
*dev
= ent
->dev
;
4701 struct ata_host_set
*host_set
;
4704 /* alloc a container for our list of ATA ports (buses) */
4705 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4706 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4709 spin_lock_init(&host_set
->lock
);
4711 host_set
->dev
= dev
;
4712 host_set
->n_ports
= ent
->n_ports
;
4713 host_set
->irq
= ent
->irq
;
4714 host_set
->mmio_base
= ent
->mmio_base
;
4715 host_set
->private_data
= ent
->private_data
;
4716 host_set
->ops
= ent
->port_ops
;
4718 /* register each port bound to this device */
4719 for (i
= 0; i
< ent
->n_ports
; i
++) {
4720 struct ata_port
*ap
;
4721 unsigned long xfer_mode_mask
;
4723 ap
= ata_host_add(ent
, host_set
, i
);
4727 host_set
->ports
[i
] = ap
;
4728 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4729 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4730 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4732 /* print per-port info to dmesg */
4733 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4734 "bmdma 0x%lX irq %lu\n",
4736 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4737 ata_mode_string(xfer_mode_mask
),
4738 ap
->ioaddr
.cmd_addr
,
4739 ap
->ioaddr
.ctl_addr
,
4740 ap
->ioaddr
.bmdma_addr
,
4744 host_set
->ops
->irq_clear(ap
);
4751 /* obtain irq, that is shared between channels */
4752 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4753 DRV_NAME
, host_set
))
4756 /* perform each probe synchronously */
4757 DPRINTK("probe begin\n");
4758 for (i
= 0; i
< count
; i
++) {
4759 struct ata_port
*ap
;
4762 ap
= host_set
->ports
[i
];
4764 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4765 rc
= ata_bus_probe(ap
);
4766 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4769 /* FIXME: do something useful here?
4770 * Current libata behavior will
4771 * tear down everything when
4772 * the module is removed
4773 * or the h/w is unplugged.
4777 rc
= scsi_add_host(ap
->host
, dev
);
4779 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4781 /* FIXME: do something useful here */
4782 /* FIXME: handle unconditional calls to
4783 * scsi_scan_host and ata_host_remove, below,
4789 /* probes are done, now scan each port's disk(s) */
4790 DPRINTK("host probe begin\n");
4791 for (i
= 0; i
< count
; i
++) {
4792 struct ata_port
*ap
= host_set
->ports
[i
];
4794 ata_scsi_scan_host(ap
);
4797 dev_set_drvdata(dev
, host_set
);
4799 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4800 return ent
->n_ports
; /* success */
4803 for (i
= 0; i
< count
; i
++) {
4804 ata_host_remove(host_set
->ports
[i
], 1);
4805 scsi_host_put(host_set
->ports
[i
]->host
);
4809 VPRINTK("EXIT, returning 0\n");
4814 * ata_host_set_remove - PCI layer callback for device removal
4815 * @host_set: ATA host set that was removed
4817 * Unregister all objects associated with this host set. Free those
4821 * Inherited from calling layer (may sleep).
4824 void ata_host_set_remove(struct ata_host_set
*host_set
)
4826 struct ata_port
*ap
;
4829 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4830 ap
= host_set
->ports
[i
];
4831 scsi_remove_host(ap
->host
);
4834 free_irq(host_set
->irq
, host_set
);
4836 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4837 ap
= host_set
->ports
[i
];
4839 ata_scsi_release(ap
->host
);
4841 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4842 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4844 if (ioaddr
->cmd_addr
== 0x1f0)
4845 release_region(0x1f0, 8);
4846 else if (ioaddr
->cmd_addr
== 0x170)
4847 release_region(0x170, 8);
4850 scsi_host_put(ap
->host
);
4853 if (host_set
->ops
->host_stop
)
4854 host_set
->ops
->host_stop(host_set
);
4860 * ata_scsi_release - SCSI layer callback hook for host unload
4861 * @host: libata host to be unloaded
4863 * Performs all duties necessary to shut down a libata port...
4864 * Kill port kthread, disable port, and release resources.
4867 * Inherited from SCSI layer.
4873 int ata_scsi_release(struct Scsi_Host
*host
)
4875 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4880 ap
->ops
->port_disable(ap
);
4881 ata_host_remove(ap
, 0);
4882 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4883 kfree(ap
->device
[i
].id
);
4890 * ata_std_ports - initialize ioaddr with standard port offsets.
4891 * @ioaddr: IO address structure to be initialized
4893 * Utility function which initializes data_addr, error_addr,
4894 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4895 * device_addr, status_addr, and command_addr to standard offsets
4896 * relative to cmd_addr.
4898 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4901 void ata_std_ports(struct ata_ioports
*ioaddr
)
4903 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4904 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4905 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4906 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4907 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4908 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4909 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4910 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4911 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4912 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4918 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4920 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4922 pci_iounmap(pdev
, host_set
->mmio_base
);
4926 * ata_pci_remove_one - PCI layer callback for device removal
4927 * @pdev: PCI device that was removed
4929 * PCI layer indicates to libata via this hook that
4930 * hot-unplug or module unload event has occurred.
4931 * Handle this by unregistering all objects associated
4932 * with this PCI device. Free those objects. Then finally
4933 * release PCI resources and disable device.
4936 * Inherited from PCI layer (may sleep).
4939 void ata_pci_remove_one (struct pci_dev
*pdev
)
4941 struct device
*dev
= pci_dev_to_dev(pdev
);
4942 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4944 ata_host_set_remove(host_set
);
4945 pci_release_regions(pdev
);
4946 pci_disable_device(pdev
);
4947 dev_set_drvdata(dev
, NULL
);
4950 /* move to PCI subsystem */
4951 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4953 unsigned long tmp
= 0;
4955 switch (bits
->width
) {
4958 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4964 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4970 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4981 return (tmp
== bits
->val
) ? 1 : 0;
4984 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4986 pci_save_state(pdev
);
4987 pci_disable_device(pdev
);
4988 pci_set_power_state(pdev
, PCI_D3hot
);
4992 int ata_pci_device_resume(struct pci_dev
*pdev
)
4994 pci_set_power_state(pdev
, PCI_D0
);
4995 pci_restore_state(pdev
);
4996 pci_enable_device(pdev
);
4997 pci_set_master(pdev
);
5000 #endif /* CONFIG_PCI */
5003 static int __init
ata_init(void)
5005 ata_wq
= create_workqueue("ata");
5009 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5013 static void __exit
ata_exit(void)
5015 destroy_workqueue(ata_wq
);
5018 module_init(ata_init
);
5019 module_exit(ata_exit
);
5021 static unsigned long ratelimit_time
;
5022 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5024 int ata_ratelimit(void)
5027 unsigned long flags
;
5029 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5031 if (time_after(jiffies
, ratelimit_time
)) {
5033 ratelimit_time
= jiffies
+ (HZ
/5);
5037 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5043 * libata is essentially a library of internal helper functions for
5044 * low-level ATA host controller drivers. As such, the API/ABI is
5045 * likely to change as new drivers are added and updated.
5046 * Do not depend on ABI/API stability.
5049 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5050 EXPORT_SYMBOL_GPL(ata_std_ports
);
5051 EXPORT_SYMBOL_GPL(ata_device_add
);
5052 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5053 EXPORT_SYMBOL_GPL(ata_sg_init
);
5054 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5055 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5056 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5057 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5058 EXPORT_SYMBOL_GPL(ata_tf_load
);
5059 EXPORT_SYMBOL_GPL(ata_tf_read
);
5060 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5061 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5062 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5063 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5064 EXPORT_SYMBOL_GPL(ata_check_status
);
5065 EXPORT_SYMBOL_GPL(ata_altstatus
);
5066 EXPORT_SYMBOL_GPL(ata_exec_command
);
5067 EXPORT_SYMBOL_GPL(ata_port_start
);
5068 EXPORT_SYMBOL_GPL(ata_port_stop
);
5069 EXPORT_SYMBOL_GPL(ata_host_stop
);
5070 EXPORT_SYMBOL_GPL(ata_interrupt
);
5071 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5072 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5073 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5074 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5075 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5076 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5077 EXPORT_SYMBOL_GPL(ata_port_probe
);
5078 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5079 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5080 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5081 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5082 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5083 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5084 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5085 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5086 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5087 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5088 EXPORT_SYMBOL_GPL(ata_port_disable
);
5089 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5090 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5091 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5092 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5093 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
5094 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5095 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5096 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5097 EXPORT_SYMBOL_GPL(ata_host_intr
);
5098 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5099 EXPORT_SYMBOL_GPL(ata_id_string
);
5100 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5101 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5102 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5103 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5105 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5106 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5107 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5110 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5111 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5112 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5113 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5114 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5115 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5116 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5117 #endif /* CONFIG_PCI */
5119 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5120 EXPORT_SYMBOL_GPL(ata_device_resume
);
5121 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5122 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);