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 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1629 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1631 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1632 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1635 static int ata_host_set_pio(struct ata_port
*ap
)
1641 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1644 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1648 base
= base_from_shift(ATA_SHIFT_PIO
);
1649 xfer_mode
= base
+ x
;
1651 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1652 (int)base
, (int)xfer_mode
, mask
, x
);
1654 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1655 struct ata_device
*dev
= &ap
->device
[i
];
1656 if (ata_dev_present(dev
)) {
1657 dev
->pio_mode
= xfer_mode
;
1658 dev
->xfer_mode
= xfer_mode
;
1659 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1660 if (ap
->ops
->set_piomode
)
1661 ap
->ops
->set_piomode(ap
, dev
);
1668 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1669 unsigned int xfer_shift
)
1673 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1674 struct ata_device
*dev
= &ap
->device
[i
];
1675 if (ata_dev_present(dev
)) {
1676 dev
->dma_mode
= xfer_mode
;
1677 dev
->xfer_mode
= xfer_mode
;
1678 dev
->xfer_shift
= xfer_shift
;
1679 if (ap
->ops
->set_dmamode
)
1680 ap
->ops
->set_dmamode(ap
, dev
);
1686 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1687 * @ap: port on which timings will be programmed
1689 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1692 * PCI/etc. bus probe sem.
1694 static void ata_set_mode(struct ata_port
*ap
)
1696 unsigned int xfer_shift
;
1700 /* step 1: always set host PIO timings */
1701 rc
= ata_host_set_pio(ap
);
1705 /* step 2: choose the best data xfer mode */
1706 xfer_mode
= xfer_shift
= 0;
1707 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1711 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1712 if (xfer_shift
!= ATA_SHIFT_PIO
)
1713 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1715 /* step 4: update devices' xfer mode */
1716 ata_dev_set_mode(ap
, &ap
->device
[0]);
1717 ata_dev_set_mode(ap
, &ap
->device
[1]);
1719 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1722 if (ap
->ops
->post_set_mode
)
1723 ap
->ops
->post_set_mode(ap
);
1728 ata_port_disable(ap
);
1732 * ata_tf_to_host - issue ATA taskfile to host controller
1733 * @ap: port to which command is being issued
1734 * @tf: ATA taskfile register set
1736 * Issues ATA taskfile register set to ATA host controller,
1737 * with proper synchronization with interrupt handler and
1741 * spin_lock_irqsave(host_set lock)
1744 static inline void ata_tf_to_host(struct ata_port
*ap
,
1745 const struct ata_taskfile
*tf
)
1747 ap
->ops
->tf_load(ap
, tf
);
1748 ap
->ops
->exec_command(ap
, tf
);
1752 * ata_busy_sleep - sleep until BSY clears, or timeout
1753 * @ap: port containing status register to be polled
1754 * @tmout_pat: impatience timeout
1755 * @tmout: overall timeout
1757 * Sleep until ATA Status register bit BSY clears,
1758 * or a timeout occurs.
1763 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1764 unsigned long tmout_pat
, unsigned long tmout
)
1766 unsigned long timer_start
, timeout
;
1769 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1770 timer_start
= jiffies
;
1771 timeout
= timer_start
+ tmout_pat
;
1772 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1774 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1777 if (status
& ATA_BUSY
)
1778 printk(KERN_WARNING
"ata%u is slow to respond, "
1779 "please be patient\n", ap
->id
);
1781 timeout
= timer_start
+ tmout
;
1782 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1784 status
= ata_chk_status(ap
);
1787 if (status
& ATA_BUSY
) {
1788 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1789 ap
->id
, tmout
/ HZ
);
1796 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1798 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1799 unsigned int dev0
= devmask
& (1 << 0);
1800 unsigned int dev1
= devmask
& (1 << 1);
1801 unsigned long timeout
;
1803 /* if device 0 was found in ata_devchk, wait for its
1807 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1809 /* if device 1 was found in ata_devchk, wait for
1810 * register access, then wait for BSY to clear
1812 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1816 ap
->ops
->dev_select(ap
, 1);
1817 if (ap
->flags
& ATA_FLAG_MMIO
) {
1818 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1819 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1821 nsect
= inb(ioaddr
->nsect_addr
);
1822 lbal
= inb(ioaddr
->lbal_addr
);
1824 if ((nsect
== 1) && (lbal
== 1))
1826 if (time_after(jiffies
, timeout
)) {
1830 msleep(50); /* give drive a breather */
1833 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1835 /* is all this really necessary? */
1836 ap
->ops
->dev_select(ap
, 0);
1838 ap
->ops
->dev_select(ap
, 1);
1840 ap
->ops
->dev_select(ap
, 0);
1844 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1845 * @ap: Port to reset and probe
1847 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1848 * probe the bus. Not often used these days.
1851 * PCI/etc. bus probe sem.
1852 * Obtains host_set lock.
1856 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1858 struct ata_taskfile tf
;
1859 unsigned long flags
;
1861 /* set up execute-device-diag (bus reset) taskfile */
1862 /* also, take interrupts to a known state (disabled) */
1863 DPRINTK("execute-device-diag\n");
1864 ata_tf_init(ap
, &tf
, 0);
1866 tf
.command
= ATA_CMD_EDD
;
1867 tf
.protocol
= ATA_PROT_NODATA
;
1870 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1871 ata_tf_to_host(ap
, &tf
);
1872 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1874 /* spec says at least 2ms. but who knows with those
1875 * crazy ATAPI devices...
1879 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1882 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1883 unsigned int devmask
)
1885 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1887 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1889 /* software reset. causes dev0 to be selected */
1890 if (ap
->flags
& ATA_FLAG_MMIO
) {
1891 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1892 udelay(20); /* FIXME: flush */
1893 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1894 udelay(20); /* FIXME: flush */
1895 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1897 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1899 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1901 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1904 /* spec mandates ">= 2ms" before checking status.
1905 * We wait 150ms, because that was the magic delay used for
1906 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1907 * between when the ATA command register is written, and then
1908 * status is checked. Because waiting for "a while" before
1909 * checking status is fine, post SRST, we perform this magic
1910 * delay here as well.
1914 ata_bus_post_reset(ap
, devmask
);
1920 * ata_bus_reset - reset host port and associated ATA channel
1921 * @ap: port to reset
1923 * This is typically the first time we actually start issuing
1924 * commands to the ATA channel. We wait for BSY to clear, then
1925 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1926 * result. Determine what devices, if any, are on the channel
1927 * by looking at the device 0/1 error register. Look at the signature
1928 * stored in each device's taskfile registers, to determine if
1929 * the device is ATA or ATAPI.
1932 * PCI/etc. bus probe sem.
1933 * Obtains host_set lock.
1936 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1939 void ata_bus_reset(struct ata_port
*ap
)
1941 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1942 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1944 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1946 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1948 /* determine if device 0/1 are present */
1949 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1952 dev0
= ata_devchk(ap
, 0);
1954 dev1
= ata_devchk(ap
, 1);
1958 devmask
|= (1 << 0);
1960 devmask
|= (1 << 1);
1962 /* select device 0 again */
1963 ap
->ops
->dev_select(ap
, 0);
1965 /* issue bus reset */
1966 if (ap
->flags
& ATA_FLAG_SRST
)
1967 rc
= ata_bus_softreset(ap
, devmask
);
1968 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1969 /* set up device control */
1970 if (ap
->flags
& ATA_FLAG_MMIO
)
1971 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1973 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1974 rc
= ata_bus_edd(ap
);
1981 * determine by signature whether we have ATA or ATAPI devices
1983 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1984 if ((slave_possible
) && (err
!= 0x81))
1985 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1987 /* re-enable interrupts */
1988 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1991 /* is double-select really necessary? */
1992 if (ap
->device
[1].class != ATA_DEV_NONE
)
1993 ap
->ops
->dev_select(ap
, 1);
1994 if (ap
->device
[0].class != ATA_DEV_NONE
)
1995 ap
->ops
->dev_select(ap
, 0);
1997 /* if no devices were detected, disable this port */
1998 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1999 (ap
->device
[1].class == ATA_DEV_NONE
))
2002 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2003 /* set up device control for ATA_FLAG_SATA_RESET */
2004 if (ap
->flags
& ATA_FLAG_MMIO
)
2005 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2007 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2014 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2015 ap
->ops
->port_disable(ap
);
2020 static int sata_phy_resume(struct ata_port
*ap
)
2022 unsigned long timeout
= jiffies
+ (HZ
* 5);
2025 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2027 /* Wait for phy to become ready, if necessary. */
2030 sstatus
= scr_read(ap
, SCR_STATUS
);
2031 if ((sstatus
& 0xf) != 1)
2033 } while (time_before(jiffies
, timeout
));
2039 * ata_std_probeinit - initialize probing
2040 * @ap: port to be probed
2042 * @ap is about to be probed. Initialize it. This function is
2043 * to be used as standard callback for ata_drive_probe_reset().
2045 * NOTE!!! Do not use this function as probeinit if a low level
2046 * driver implements only hardreset. Just pass NULL as probeinit
2047 * in that case. Using this function is probably okay but doing
2048 * so makes reset sequence different from the original
2049 * ->phy_reset implementation and Jeff nervous. :-P
2051 extern void ata_std_probeinit(struct ata_port
*ap
)
2053 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2054 sata_phy_resume(ap
);
2055 if (sata_dev_present(ap
))
2056 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2061 * ata_std_softreset - reset host port via ATA SRST
2062 * @ap: port to reset
2063 * @verbose: fail verbosely
2064 * @classes: resulting classes of attached devices
2066 * Reset host port using ATA SRST. This function is to be used
2067 * as standard callback for ata_drive_*_reset() functions.
2070 * Kernel thread context (may sleep)
2073 * 0 on success, -errno otherwise.
2075 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2077 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2078 unsigned int devmask
= 0, err_mask
;
2083 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2084 classes
[0] = ATA_DEV_NONE
;
2088 /* determine if device 0/1 are present */
2089 if (ata_devchk(ap
, 0))
2090 devmask
|= (1 << 0);
2091 if (slave_possible
&& ata_devchk(ap
, 1))
2092 devmask
|= (1 << 1);
2094 /* select device 0 again */
2095 ap
->ops
->dev_select(ap
, 0);
2097 /* issue bus reset */
2098 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2099 err_mask
= ata_bus_softreset(ap
, devmask
);
2102 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2105 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2110 /* determine by signature whether we have ATA or ATAPI devices */
2111 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2112 if (slave_possible
&& err
!= 0x81)
2113 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2116 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2121 * sata_std_hardreset - reset host port via SATA phy reset
2122 * @ap: port to reset
2123 * @verbose: fail verbosely
2124 * @class: resulting class of attached device
2126 * SATA phy-reset host port using DET bits of SControl register.
2127 * This function is to be used as standard callback for
2128 * ata_drive_*_reset().
2131 * Kernel thread context (may sleep)
2134 * 0 on success, -errno otherwise.
2136 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2140 /* Issue phy wake/reset */
2141 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2144 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2145 * 10.4.2 says at least 1 ms.
2149 /* Bring phy back */
2150 sata_phy_resume(ap
);
2152 /* TODO: phy layer with polling, timeouts, etc. */
2153 if (!sata_dev_present(ap
)) {
2154 *class = ATA_DEV_NONE
;
2155 DPRINTK("EXIT, link offline\n");
2159 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2161 printk(KERN_ERR
"ata%u: COMRESET failed "
2162 "(device not ready)\n", ap
->id
);
2164 DPRINTK("EXIT, device not ready\n");
2168 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2170 *class = ata_dev_try_classify(ap
, 0, NULL
);
2172 DPRINTK("EXIT, class=%u\n", *class);
2177 * ata_std_postreset - standard postreset callback
2178 * @ap: the target ata_port
2179 * @classes: classes of attached devices
2181 * This function is invoked after a successful reset. Note that
2182 * the device might have been reset more than once using
2183 * different reset methods before postreset is invoked.
2185 * This function is to be used as standard callback for
2186 * ata_drive_*_reset().
2189 * Kernel thread context (may sleep)
2191 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2195 /* set cable type if it isn't already set */
2196 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2197 ap
->cbl
= ATA_CBL_SATA
;
2199 /* print link status */
2200 if (ap
->cbl
== ATA_CBL_SATA
)
2201 sata_print_link_status(ap
);
2203 /* re-enable interrupts */
2204 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2207 /* is double-select really necessary? */
2208 if (classes
[0] != ATA_DEV_NONE
)
2209 ap
->ops
->dev_select(ap
, 1);
2210 if (classes
[1] != ATA_DEV_NONE
)
2211 ap
->ops
->dev_select(ap
, 0);
2213 /* bail out if no device is present */
2214 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2215 DPRINTK("EXIT, no device\n");
2219 /* set up device control */
2220 if (ap
->ioaddr
.ctl_addr
) {
2221 if (ap
->flags
& ATA_FLAG_MMIO
)
2222 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2224 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2231 * ata_std_probe_reset - standard probe reset method
2232 * @ap: prot to perform probe-reset
2233 * @classes: resulting classes of attached devices
2235 * The stock off-the-shelf ->probe_reset method.
2238 * Kernel thread context (may sleep)
2241 * 0 on success, -errno otherwise.
2243 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2245 ata_reset_fn_t hardreset
;
2248 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2249 hardreset
= sata_std_hardreset
;
2251 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2252 ata_std_softreset
, hardreset
,
2253 ata_std_postreset
, classes
);
2256 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2257 ata_postreset_fn_t postreset
,
2258 unsigned int *classes
)
2262 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2263 classes
[i
] = ATA_DEV_UNKNOWN
;
2265 rc
= reset(ap
, 0, classes
);
2269 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2270 * is complete and convert all ATA_DEV_UNKNOWN to
2273 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2274 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2277 if (i
< ATA_MAX_DEVICES
)
2278 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2279 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2280 classes
[i
] = ATA_DEV_NONE
;
2283 postreset(ap
, classes
);
2285 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2289 * ata_drive_probe_reset - Perform probe reset with given methods
2290 * @ap: port to reset
2291 * @probeinit: probeinit method (can be NULL)
2292 * @softreset: softreset method (can be NULL)
2293 * @hardreset: hardreset method (can be NULL)
2294 * @postreset: postreset method (can be NULL)
2295 * @classes: resulting classes of attached devices
2297 * Reset the specified port and classify attached devices using
2298 * given methods. This function prefers softreset but tries all
2299 * possible reset sequences to reset and classify devices. This
2300 * function is intended to be used for constructing ->probe_reset
2301 * callback by low level drivers.
2303 * Reset methods should follow the following rules.
2305 * - Return 0 on sucess, -errno on failure.
2306 * - If classification is supported, fill classes[] with
2307 * recognized class codes.
2308 * - If classification is not supported, leave classes[] alone.
2309 * - If verbose is non-zero, print error message on failure;
2310 * otherwise, shut up.
2313 * Kernel thread context (may sleep)
2316 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2317 * if classification fails, and any error code from reset
2320 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2321 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2322 ata_postreset_fn_t postreset
, unsigned int *classes
)
2330 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2338 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2339 if (rc
== 0 || rc
!= -ENODEV
)
2343 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2348 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2349 const struct ata_device
*dev
)
2351 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2352 ap
->id
, dev
->devno
);
2355 static const char * const ata_dma_blacklist
[] = {
2374 "Toshiba CD-ROM XM-6202B",
2375 "TOSHIBA CD-ROM XM-1702BC",
2377 "E-IDE CD-ROM CR-840",
2380 "SAMSUNG CD-ROM SC-148C",
2381 "SAMSUNG CD-ROM SC",
2383 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2387 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2389 unsigned char model_num
[41];
2392 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2394 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2395 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2401 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2403 const struct ata_device
*master
, *slave
;
2406 master
= &ap
->device
[0];
2407 slave
= &ap
->device
[1];
2409 WARN_ON(!ata_dev_present(master
) && !ata_dev_present(slave
));
2411 if (shift
== ATA_SHIFT_UDMA
) {
2412 mask
= ap
->udma_mask
;
2413 if (ata_dev_present(master
)) {
2414 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2415 if (ata_dma_blacklisted(master
)) {
2417 ata_pr_blacklisted(ap
, master
);
2420 if (ata_dev_present(slave
)) {
2421 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2422 if (ata_dma_blacklisted(slave
)) {
2424 ata_pr_blacklisted(ap
, slave
);
2428 else if (shift
== ATA_SHIFT_MWDMA
) {
2429 mask
= ap
->mwdma_mask
;
2430 if (ata_dev_present(master
)) {
2431 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2432 if (ata_dma_blacklisted(master
)) {
2434 ata_pr_blacklisted(ap
, master
);
2437 if (ata_dev_present(slave
)) {
2438 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2439 if (ata_dma_blacklisted(slave
)) {
2441 ata_pr_blacklisted(ap
, slave
);
2445 else if (shift
== ATA_SHIFT_PIO
) {
2446 mask
= ap
->pio_mask
;
2447 if (ata_dev_present(master
)) {
2448 /* spec doesn't return explicit support for
2449 * PIO0-2, so we fake it
2451 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2456 if (ata_dev_present(slave
)) {
2457 /* spec doesn't return explicit support for
2458 * PIO0-2, so we fake it
2460 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2467 mask
= 0xffffffff; /* shut up compiler warning */
2474 /* find greatest bit */
2475 static int fgb(u32 bitmap
)
2480 for (i
= 0; i
< 32; i
++)
2481 if (bitmap
& (1 << i
))
2488 * ata_choose_xfer_mode - attempt to find best transfer mode
2489 * @ap: Port for which an xfer mode will be selected
2490 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2491 * @xfer_shift_out: (output) bit shift that selects this mode
2493 * Based on host and device capabilities, determine the
2494 * maximum transfer mode that is amenable to all.
2497 * PCI/etc. bus probe sem.
2500 * Zero on success, negative on error.
2503 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2505 unsigned int *xfer_shift_out
)
2507 unsigned int mask
, shift
;
2510 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2511 shift
= xfer_mode_classes
[i
].shift
;
2512 mask
= ata_get_mode_mask(ap
, shift
);
2516 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2517 *xfer_shift_out
= shift
;
2526 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2527 * @ap: Port associated with device @dev
2528 * @dev: Device to which command will be sent
2530 * Issue SET FEATURES - XFER MODE command to device @dev
2534 * PCI/etc. bus probe sem.
2537 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2539 struct ata_taskfile tf
;
2541 /* set up set-features taskfile */
2542 DPRINTK("set features - xfer mode\n");
2544 ata_tf_init(ap
, &tf
, dev
->devno
);
2545 tf
.command
= ATA_CMD_SET_FEATURES
;
2546 tf
.feature
= SETFEATURES_XFER
;
2547 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2548 tf
.protocol
= ATA_PROT_NODATA
;
2549 tf
.nsect
= dev
->xfer_mode
;
2551 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2552 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2554 ata_port_disable(ap
);
2561 * ata_dev_init_params - Issue INIT DEV PARAMS command
2562 * @ap: Port associated with device @dev
2563 * @dev: Device to which command will be sent
2566 * Kernel thread context (may sleep)
2569 * 0 on success, AC_ERR_* mask otherwise.
2572 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2573 struct ata_device
*dev
)
2575 struct ata_taskfile tf
;
2576 unsigned int err_mask
;
2577 u16 sectors
= dev
->id
[6];
2578 u16 heads
= dev
->id
[3];
2580 /* Number of sectors per track 1-255. Number of heads 1-16 */
2581 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2584 /* set up init dev params taskfile */
2585 DPRINTK("init dev params \n");
2587 ata_tf_init(ap
, &tf
, dev
->devno
);
2588 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2589 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2590 tf
.protocol
= ATA_PROT_NODATA
;
2592 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2594 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2596 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2601 * ata_sg_clean - Unmap DMA memory associated with command
2602 * @qc: Command containing DMA memory to be released
2604 * Unmap all mapped DMA memory associated with this command.
2607 * spin_lock_irqsave(host_set lock)
2610 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2612 struct ata_port
*ap
= qc
->ap
;
2613 struct scatterlist
*sg
= qc
->__sg
;
2614 int dir
= qc
->dma_dir
;
2615 void *pad_buf
= NULL
;
2617 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2618 WARN_ON(sg
== NULL
);
2620 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2621 WARN_ON(qc
->n_elem
> 1);
2623 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2625 /* if we padded the buffer out to 32-bit bound, and data
2626 * xfer direction is from-device, we must copy from the
2627 * pad buffer back into the supplied buffer
2629 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2630 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2632 if (qc
->flags
& ATA_QCFLAG_SG
) {
2634 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2635 /* restore last sg */
2636 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2638 struct scatterlist
*psg
= &qc
->pad_sgent
;
2639 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2640 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2641 kunmap_atomic(addr
, KM_IRQ0
);
2645 dma_unmap_single(ap
->host_set
->dev
,
2646 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2649 sg
->length
+= qc
->pad_len
;
2651 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2652 pad_buf
, qc
->pad_len
);
2655 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2660 * ata_fill_sg - Fill PCI IDE PRD table
2661 * @qc: Metadata associated with taskfile to be transferred
2663 * Fill PCI IDE PRD (scatter-gather) table with segments
2664 * associated with the current disk command.
2667 * spin_lock_irqsave(host_set lock)
2670 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2672 struct ata_port
*ap
= qc
->ap
;
2673 struct scatterlist
*sg
;
2676 WARN_ON(qc
->__sg
== NULL
);
2677 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2680 ata_for_each_sg(sg
, qc
) {
2684 /* determine if physical DMA addr spans 64K boundary.
2685 * Note h/w doesn't support 64-bit, so we unconditionally
2686 * truncate dma_addr_t to u32.
2688 addr
= (u32
) sg_dma_address(sg
);
2689 sg_len
= sg_dma_len(sg
);
2692 offset
= addr
& 0xffff;
2694 if ((offset
+ sg_len
) > 0x10000)
2695 len
= 0x10000 - offset
;
2697 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2698 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2699 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2708 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2711 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2712 * @qc: Metadata associated with taskfile to check
2714 * Allow low-level driver to filter ATA PACKET commands, returning
2715 * a status indicating whether or not it is OK to use DMA for the
2716 * supplied PACKET command.
2719 * spin_lock_irqsave(host_set lock)
2721 * RETURNS: 0 when ATAPI DMA can be used
2724 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2726 struct ata_port
*ap
= qc
->ap
;
2727 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2729 if (ap
->ops
->check_atapi_dma
)
2730 rc
= ap
->ops
->check_atapi_dma(qc
);
2735 * ata_qc_prep - Prepare taskfile for submission
2736 * @qc: Metadata associated with taskfile to be prepared
2738 * Prepare ATA taskfile for submission.
2741 * spin_lock_irqsave(host_set lock)
2743 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2745 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2752 * ata_sg_init_one - Associate command with memory buffer
2753 * @qc: Command to be associated
2754 * @buf: Memory buffer
2755 * @buflen: Length of memory buffer, in bytes.
2757 * Initialize the data-related elements of queued_cmd @qc
2758 * to point to a single memory buffer, @buf of byte length @buflen.
2761 * spin_lock_irqsave(host_set lock)
2764 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2766 struct scatterlist
*sg
;
2768 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2770 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2771 qc
->__sg
= &qc
->sgent
;
2773 qc
->orig_n_elem
= 1;
2777 sg_init_one(sg
, buf
, buflen
);
2781 * ata_sg_init - Associate command with scatter-gather table.
2782 * @qc: Command to be associated
2783 * @sg: Scatter-gather table.
2784 * @n_elem: Number of elements in s/g table.
2786 * Initialize the data-related elements of queued_cmd @qc
2787 * to point to a scatter-gather table @sg, containing @n_elem
2791 * spin_lock_irqsave(host_set lock)
2794 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2795 unsigned int n_elem
)
2797 qc
->flags
|= ATA_QCFLAG_SG
;
2799 qc
->n_elem
= n_elem
;
2800 qc
->orig_n_elem
= n_elem
;
2804 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2805 * @qc: Command with memory buffer to be mapped.
2807 * DMA-map the memory buffer associated with queued_cmd @qc.
2810 * spin_lock_irqsave(host_set lock)
2813 * Zero on success, negative on error.
2816 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2818 struct ata_port
*ap
= qc
->ap
;
2819 int dir
= qc
->dma_dir
;
2820 struct scatterlist
*sg
= qc
->__sg
;
2821 dma_addr_t dma_address
;
2824 /* we must lengthen transfers to end on a 32-bit boundary */
2825 qc
->pad_len
= sg
->length
& 3;
2827 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2828 struct scatterlist
*psg
= &qc
->pad_sgent
;
2830 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2832 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2834 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2835 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2838 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2839 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2841 sg
->length
-= qc
->pad_len
;
2842 if (sg
->length
== 0)
2845 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2846 sg
->length
, qc
->pad_len
);
2854 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2856 if (dma_mapping_error(dma_address
)) {
2858 sg
->length
+= qc
->pad_len
;
2862 sg_dma_address(sg
) = dma_address
;
2863 sg_dma_len(sg
) = sg
->length
;
2866 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2867 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2873 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2874 * @qc: Command with scatter-gather table to be mapped.
2876 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2879 * spin_lock_irqsave(host_set lock)
2882 * Zero on success, negative on error.
2886 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2888 struct ata_port
*ap
= qc
->ap
;
2889 struct scatterlist
*sg
= qc
->__sg
;
2890 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2891 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2893 VPRINTK("ENTER, ata%u\n", ap
->id
);
2894 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
2896 /* we must lengthen transfers to end on a 32-bit boundary */
2897 qc
->pad_len
= lsg
->length
& 3;
2899 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2900 struct scatterlist
*psg
= &qc
->pad_sgent
;
2901 unsigned int offset
;
2903 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2905 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2908 * psg->page/offset are used to copy to-be-written
2909 * data in this function or read data in ata_sg_clean.
2911 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2912 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2913 psg
->offset
= offset_in_page(offset
);
2915 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2916 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2917 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2918 kunmap_atomic(addr
, KM_IRQ0
);
2921 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2922 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2924 lsg
->length
-= qc
->pad_len
;
2925 if (lsg
->length
== 0)
2928 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2929 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2932 pre_n_elem
= qc
->n_elem
;
2933 if (trim_sg
&& pre_n_elem
)
2942 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2944 /* restore last sg */
2945 lsg
->length
+= qc
->pad_len
;
2949 DPRINTK("%d sg elements mapped\n", n_elem
);
2952 qc
->n_elem
= n_elem
;
2958 * ata_poll_qc_complete - turn irq back on and finish qc
2959 * @qc: Command to complete
2960 * @err_mask: ATA status register content
2963 * None. (grabs host lock)
2966 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2968 struct ata_port
*ap
= qc
->ap
;
2969 unsigned long flags
;
2971 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2972 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2974 ata_qc_complete(qc
);
2975 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2979 * ata_pio_poll - poll using PIO, depending on current state
2980 * @ap: the target ata_port
2983 * None. (executing in kernel thread context)
2986 * timeout value to use
2989 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2991 struct ata_queued_cmd
*qc
;
2993 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2994 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2996 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2997 WARN_ON(qc
== NULL
);
2999 switch (ap
->hsm_task_state
) {
3002 poll_state
= HSM_ST_POLL
;
3006 case HSM_ST_LAST_POLL
:
3007 poll_state
= HSM_ST_LAST_POLL
;
3008 reg_state
= HSM_ST_LAST
;
3015 status
= ata_chk_status(ap
);
3016 if (status
& ATA_BUSY
) {
3017 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3018 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3019 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3022 ap
->hsm_task_state
= poll_state
;
3023 return ATA_SHORT_PAUSE
;
3026 ap
->hsm_task_state
= reg_state
;
3031 * ata_pio_complete - check if drive is busy or idle
3032 * @ap: the target ata_port
3035 * None. (executing in kernel thread context)
3038 * Non-zero if qc completed, zero otherwise.
3041 static int ata_pio_complete (struct ata_port
*ap
)
3043 struct ata_queued_cmd
*qc
;
3047 * This is purely heuristic. This is a fast path. Sometimes when
3048 * we enter, BSY will be cleared in a chk-status or two. If not,
3049 * the drive is probably seeking or something. Snooze for a couple
3050 * msecs, then chk-status again. If still busy, fall back to
3051 * HSM_ST_POLL state.
3053 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3054 if (drv_stat
& ATA_BUSY
) {
3056 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3057 if (drv_stat
& ATA_BUSY
) {
3058 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3059 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3064 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3065 WARN_ON(qc
== NULL
);
3067 drv_stat
= ata_wait_idle(ap
);
3068 if (!ata_ok(drv_stat
)) {
3069 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3070 ap
->hsm_task_state
= HSM_ST_ERR
;
3074 ap
->hsm_task_state
= HSM_ST_IDLE
;
3076 WARN_ON(qc
->err_mask
);
3077 ata_poll_qc_complete(qc
);
3079 /* another command may start at this point */
3086 * swap_buf_le16 - swap halves of 16-bit words in place
3087 * @buf: Buffer to swap
3088 * @buf_words: Number of 16-bit words in buffer.
3090 * Swap halves of 16-bit words if needed to convert from
3091 * little-endian byte order to native cpu byte order, or
3095 * Inherited from caller.
3097 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3102 for (i
= 0; i
< buf_words
; i
++)
3103 buf
[i
] = le16_to_cpu(buf
[i
]);
3104 #endif /* __BIG_ENDIAN */
3108 * ata_mmio_data_xfer - Transfer data by MMIO
3109 * @ap: port to read/write
3111 * @buflen: buffer length
3112 * @write_data: read/write
3114 * Transfer data from/to the device data register by MMIO.
3117 * Inherited from caller.
3120 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3121 unsigned int buflen
, int write_data
)
3124 unsigned int words
= buflen
>> 1;
3125 u16
*buf16
= (u16
*) buf
;
3126 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3128 /* Transfer multiple of 2 bytes */
3130 for (i
= 0; i
< words
; i
++)
3131 writew(le16_to_cpu(buf16
[i
]), mmio
);
3133 for (i
= 0; i
< words
; i
++)
3134 buf16
[i
] = cpu_to_le16(readw(mmio
));
3137 /* Transfer trailing 1 byte, if any. */
3138 if (unlikely(buflen
& 0x01)) {
3139 u16 align_buf
[1] = { 0 };
3140 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3143 memcpy(align_buf
, trailing_buf
, 1);
3144 writew(le16_to_cpu(align_buf
[0]), mmio
);
3146 align_buf
[0] = cpu_to_le16(readw(mmio
));
3147 memcpy(trailing_buf
, align_buf
, 1);
3153 * ata_pio_data_xfer - Transfer data by PIO
3154 * @ap: port to read/write
3156 * @buflen: buffer length
3157 * @write_data: read/write
3159 * Transfer data from/to the device data register by PIO.
3162 * Inherited from caller.
3165 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3166 unsigned int buflen
, int write_data
)
3168 unsigned int words
= buflen
>> 1;
3170 /* Transfer multiple of 2 bytes */
3172 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3174 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3176 /* Transfer trailing 1 byte, if any. */
3177 if (unlikely(buflen
& 0x01)) {
3178 u16 align_buf
[1] = { 0 };
3179 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3182 memcpy(align_buf
, trailing_buf
, 1);
3183 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3185 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3186 memcpy(trailing_buf
, align_buf
, 1);
3192 * ata_data_xfer - Transfer data from/to the data register.
3193 * @ap: port to read/write
3195 * @buflen: buffer length
3196 * @do_write: read/write
3198 * Transfer data from/to the device data register.
3201 * Inherited from caller.
3204 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3205 unsigned int buflen
, int do_write
)
3207 /* Make the crap hardware pay the costs not the good stuff */
3208 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3209 unsigned long flags
;
3210 local_irq_save(flags
);
3211 if (ap
->flags
& ATA_FLAG_MMIO
)
3212 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3214 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3215 local_irq_restore(flags
);
3217 if (ap
->flags
& ATA_FLAG_MMIO
)
3218 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3220 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3225 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3226 * @qc: Command on going
3228 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3231 * Inherited from caller.
3234 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3236 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3237 struct scatterlist
*sg
= qc
->__sg
;
3238 struct ata_port
*ap
= qc
->ap
;
3240 unsigned int offset
;
3243 if (qc
->cursect
== (qc
->nsect
- 1))
3244 ap
->hsm_task_state
= HSM_ST_LAST
;
3246 page
= sg
[qc
->cursg
].page
;
3247 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3249 /* get the current page and offset */
3250 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3251 offset
%= PAGE_SIZE
;
3253 buf
= kmap(page
) + offset
;
3258 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3263 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3265 /* do the actual data transfer */
3266 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3267 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3273 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3274 * @qc: Command on going
3275 * @bytes: number of bytes
3277 * Transfer Transfer data from/to the ATAPI device.
3280 * Inherited from caller.
3284 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3286 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3287 struct scatterlist
*sg
= qc
->__sg
;
3288 struct ata_port
*ap
= qc
->ap
;
3291 unsigned int offset
, count
;
3293 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3294 ap
->hsm_task_state
= HSM_ST_LAST
;
3297 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3299 * The end of qc->sg is reached and the device expects
3300 * more data to transfer. In order not to overrun qc->sg
3301 * and fulfill length specified in the byte count register,
3302 * - for read case, discard trailing data from the device
3303 * - for write case, padding zero data to the device
3305 u16 pad_buf
[1] = { 0 };
3306 unsigned int words
= bytes
>> 1;
3309 if (words
) /* warning if bytes > 1 */
3310 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3313 for (i
= 0; i
< words
; i
++)
3314 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3316 ap
->hsm_task_state
= HSM_ST_LAST
;
3320 sg
= &qc
->__sg
[qc
->cursg
];
3323 offset
= sg
->offset
+ qc
->cursg_ofs
;
3325 /* get the current page and offset */
3326 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3327 offset
%= PAGE_SIZE
;
3329 /* don't overrun current sg */
3330 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3332 /* don't cross page boundaries */
3333 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3335 buf
= kmap(page
) + offset
;
3338 qc
->curbytes
+= count
;
3339 qc
->cursg_ofs
+= count
;
3341 if (qc
->cursg_ofs
== sg
->length
) {
3346 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3348 /* do the actual data transfer */
3349 ata_data_xfer(ap
, buf
, count
, do_write
);
3358 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3359 * @qc: Command on going
3361 * Transfer Transfer data from/to the ATAPI device.
3364 * Inherited from caller.
3367 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3369 struct ata_port
*ap
= qc
->ap
;
3370 struct ata_device
*dev
= qc
->dev
;
3371 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3372 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3374 ap
->ops
->tf_read(ap
, &qc
->tf
);
3375 ireason
= qc
->tf
.nsect
;
3376 bc_lo
= qc
->tf
.lbam
;
3377 bc_hi
= qc
->tf
.lbah
;
3378 bytes
= (bc_hi
<< 8) | bc_lo
;
3380 /* shall be cleared to zero, indicating xfer of data */
3381 if (ireason
& (1 << 0))
3384 /* make sure transfer direction matches expected */
3385 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3386 if (do_write
!= i_write
)
3389 __atapi_pio_bytes(qc
, bytes
);
3394 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3395 ap
->id
, dev
->devno
);
3396 qc
->err_mask
|= AC_ERR_HSM
;
3397 ap
->hsm_task_state
= HSM_ST_ERR
;
3401 * ata_pio_block - start PIO on a block
3402 * @ap: the target ata_port
3405 * None. (executing in kernel thread context)
3408 static void ata_pio_block(struct ata_port
*ap
)
3410 struct ata_queued_cmd
*qc
;
3414 * This is purely heuristic. This is a fast path.
3415 * Sometimes when we enter, BSY will be cleared in
3416 * a chk-status or two. If not, the drive is probably seeking
3417 * or something. Snooze for a couple msecs, then
3418 * chk-status again. If still busy, fall back to
3419 * HSM_ST_POLL state.
3421 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3422 if (status
& ATA_BUSY
) {
3424 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3425 if (status
& ATA_BUSY
) {
3426 ap
->hsm_task_state
= HSM_ST_POLL
;
3427 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3432 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3433 WARN_ON(qc
== NULL
);
3436 if (status
& (ATA_ERR
| ATA_DF
)) {
3437 qc
->err_mask
|= AC_ERR_DEV
;
3438 ap
->hsm_task_state
= HSM_ST_ERR
;
3442 /* transfer data if any */
3443 if (is_atapi_taskfile(&qc
->tf
)) {
3444 /* DRQ=0 means no more data to transfer */
3445 if ((status
& ATA_DRQ
) == 0) {
3446 ap
->hsm_task_state
= HSM_ST_LAST
;
3450 atapi_pio_bytes(qc
);
3452 /* handle BSY=0, DRQ=0 as error */
3453 if ((status
& ATA_DRQ
) == 0) {
3454 qc
->err_mask
|= AC_ERR_HSM
;
3455 ap
->hsm_task_state
= HSM_ST_ERR
;
3463 static void ata_pio_error(struct ata_port
*ap
)
3465 struct ata_queued_cmd
*qc
;
3467 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3468 WARN_ON(qc
== NULL
);
3470 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3471 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3473 /* make sure qc->err_mask is available to
3474 * know what's wrong and recover
3476 WARN_ON(qc
->err_mask
== 0);
3478 ap
->hsm_task_state
= HSM_ST_IDLE
;
3480 ata_poll_qc_complete(qc
);
3483 static void ata_pio_task(void *_data
)
3485 struct ata_port
*ap
= _data
;
3486 unsigned long timeout
;
3493 switch (ap
->hsm_task_state
) {
3502 qc_completed
= ata_pio_complete(ap
);
3506 case HSM_ST_LAST_POLL
:
3507 timeout
= ata_pio_poll(ap
);
3517 ata_queue_delayed_pio_task(ap
, timeout
);
3518 else if (!qc_completed
)
3523 * ata_qc_timeout - Handle timeout of queued command
3524 * @qc: Command that timed out
3526 * Some part of the kernel (currently, only the SCSI layer)
3527 * has noticed that the active command on port @ap has not
3528 * completed after a specified length of time. Handle this
3529 * condition by disabling DMA (if necessary) and completing
3530 * transactions, with error if necessary.
3532 * This also handles the case of the "lost interrupt", where
3533 * for some reason (possibly hardware bug, possibly driver bug)
3534 * an interrupt was not delivered to the driver, even though the
3535 * transaction completed successfully.
3538 * Inherited from SCSI layer (none, can sleep)
3541 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3543 struct ata_port
*ap
= qc
->ap
;
3544 struct ata_host_set
*host_set
= ap
->host_set
;
3545 u8 host_stat
= 0, drv_stat
;
3546 unsigned long flags
;
3550 ata_flush_pio_tasks(ap
);
3551 ap
->hsm_task_state
= HSM_ST_IDLE
;
3553 spin_lock_irqsave(&host_set
->lock
, flags
);
3555 switch (qc
->tf
.protocol
) {
3558 case ATA_PROT_ATAPI_DMA
:
3559 host_stat
= ap
->ops
->bmdma_status(ap
);
3561 /* before we do anything else, clear DMA-Start bit */
3562 ap
->ops
->bmdma_stop(qc
);
3568 drv_stat
= ata_chk_status(ap
);
3570 /* ack bmdma irq events */
3571 ap
->ops
->irq_clear(ap
);
3573 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3574 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3576 /* complete taskfile transaction */
3577 qc
->err_mask
|= ac_err_mask(drv_stat
);
3581 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3583 ata_eh_qc_complete(qc
);
3589 * ata_eng_timeout - Handle timeout of queued command
3590 * @ap: Port on which timed-out command is active
3592 * Some part of the kernel (currently, only the SCSI layer)
3593 * has noticed that the active command on port @ap has not
3594 * completed after a specified length of time. Handle this
3595 * condition by disabling DMA (if necessary) and completing
3596 * transactions, with error if necessary.
3598 * This also handles the case of the "lost interrupt", where
3599 * for some reason (possibly hardware bug, possibly driver bug)
3600 * an interrupt was not delivered to the driver, even though the
3601 * transaction completed successfully.
3604 * Inherited from SCSI layer (none, can sleep)
3607 void ata_eng_timeout(struct ata_port
*ap
)
3611 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3617 * ata_qc_new - Request an available ATA command, for queueing
3618 * @ap: Port associated with device @dev
3619 * @dev: Device from whom we request an available command structure
3625 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3627 struct ata_queued_cmd
*qc
= NULL
;
3630 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3631 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3632 qc
= ata_qc_from_tag(ap
, i
);
3643 * ata_qc_new_init - Request an available ATA command, and initialize it
3644 * @ap: Port associated with device @dev
3645 * @dev: Device from whom we request an available command structure
3651 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3652 struct ata_device
*dev
)
3654 struct ata_queued_cmd
*qc
;
3656 qc
= ata_qc_new(ap
);
3669 * ata_qc_free - free unused ata_queued_cmd
3670 * @qc: Command to complete
3672 * Designed to free unused ata_queued_cmd object
3673 * in case something prevents using it.
3676 * spin_lock_irqsave(host_set lock)
3678 void ata_qc_free(struct ata_queued_cmd
*qc
)
3680 struct ata_port
*ap
= qc
->ap
;
3683 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3687 if (likely(ata_tag_valid(tag
))) {
3688 if (tag
== ap
->active_tag
)
3689 ap
->active_tag
= ATA_TAG_POISON
;
3690 qc
->tag
= ATA_TAG_POISON
;
3691 clear_bit(tag
, &ap
->qactive
);
3695 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3697 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3698 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3700 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3703 /* atapi: mark qc as inactive to prevent the interrupt handler
3704 * from completing the command twice later, before the error handler
3705 * is called. (when rc != 0 and atapi request sense is needed)
3707 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3709 /* call completion callback */
3710 qc
->complete_fn(qc
);
3713 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3715 struct ata_port
*ap
= qc
->ap
;
3717 switch (qc
->tf
.protocol
) {
3719 case ATA_PROT_ATAPI_DMA
:
3722 case ATA_PROT_ATAPI
:
3724 case ATA_PROT_PIO_MULT
:
3725 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3738 * ata_qc_issue - issue taskfile to device
3739 * @qc: command to issue to device
3741 * Prepare an ATA command to submission to device.
3742 * This includes mapping the data into a DMA-able
3743 * area, filling in the S/G table, and finally
3744 * writing the taskfile to hardware, starting the command.
3747 * spin_lock_irqsave(host_set lock)
3750 * Zero on success, AC_ERR_* mask on failure
3753 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3755 struct ata_port
*ap
= qc
->ap
;
3757 if (ata_should_dma_map(qc
)) {
3758 if (qc
->flags
& ATA_QCFLAG_SG
) {
3759 if (ata_sg_setup(qc
))
3761 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3762 if (ata_sg_setup_one(qc
))
3766 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3769 ap
->ops
->qc_prep(qc
);
3771 qc
->ap
->active_tag
= qc
->tag
;
3772 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3774 return ap
->ops
->qc_issue(qc
);
3777 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3778 return AC_ERR_SYSTEM
;
3783 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3784 * @qc: command to issue to device
3786 * Using various libata functions and hooks, this function
3787 * starts an ATA command. ATA commands are grouped into
3788 * classes called "protocols", and issuing each type of protocol
3789 * is slightly different.
3791 * May be used as the qc_issue() entry in ata_port_operations.
3794 * spin_lock_irqsave(host_set lock)
3797 * Zero on success, AC_ERR_* mask on failure
3800 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3802 struct ata_port
*ap
= qc
->ap
;
3804 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3806 switch (qc
->tf
.protocol
) {
3807 case ATA_PROT_NODATA
:
3808 ata_tf_to_host(ap
, &qc
->tf
);
3812 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3813 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3814 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3817 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3818 ata_qc_set_polling(qc
);
3819 ata_tf_to_host(ap
, &qc
->tf
);
3820 ap
->hsm_task_state
= HSM_ST
;
3821 ata_queue_pio_task(ap
);
3824 case ATA_PROT_ATAPI
:
3825 ata_qc_set_polling(qc
);
3826 ata_tf_to_host(ap
, &qc
->tf
);
3827 ata_queue_packet_task(ap
);
3830 case ATA_PROT_ATAPI_NODATA
:
3831 ap
->flags
|= ATA_FLAG_NOINTR
;
3832 ata_tf_to_host(ap
, &qc
->tf
);
3833 ata_queue_packet_task(ap
);
3836 case ATA_PROT_ATAPI_DMA
:
3837 ap
->flags
|= ATA_FLAG_NOINTR
;
3838 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3839 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3840 ata_queue_packet_task(ap
);
3845 return AC_ERR_SYSTEM
;
3852 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3853 * @qc: Info associated with this ATA transaction.
3856 * spin_lock_irqsave(host_set lock)
3859 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3861 struct ata_port
*ap
= qc
->ap
;
3862 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3864 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3866 /* load PRD table addr. */
3867 mb(); /* make sure PRD table writes are visible to controller */
3868 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3870 /* specify data direction, triple-check start bit is clear */
3871 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3872 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3874 dmactl
|= ATA_DMA_WR
;
3875 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3877 /* issue r/w command */
3878 ap
->ops
->exec_command(ap
, &qc
->tf
);
3882 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3883 * @qc: Info associated with this ATA transaction.
3886 * spin_lock_irqsave(host_set lock)
3889 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3891 struct ata_port
*ap
= qc
->ap
;
3892 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3895 /* start host DMA transaction */
3896 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3897 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3899 /* Strictly, one may wish to issue a readb() here, to
3900 * flush the mmio write. However, control also passes
3901 * to the hardware at this point, and it will interrupt
3902 * us when we are to resume control. So, in effect,
3903 * we don't care when the mmio write flushes.
3904 * Further, a read of the DMA status register _immediately_
3905 * following the write may not be what certain flaky hardware
3906 * is expected, so I think it is best to not add a readb()
3907 * without first all the MMIO ATA cards/mobos.
3908 * Or maybe I'm just being paranoid.
3913 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3914 * @qc: Info associated with this ATA transaction.
3917 * spin_lock_irqsave(host_set lock)
3920 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3922 struct ata_port
*ap
= qc
->ap
;
3923 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3926 /* load PRD table addr. */
3927 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3929 /* specify data direction, triple-check start bit is clear */
3930 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3931 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3933 dmactl
|= ATA_DMA_WR
;
3934 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3936 /* issue r/w command */
3937 ap
->ops
->exec_command(ap
, &qc
->tf
);
3941 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3942 * @qc: Info associated with this ATA transaction.
3945 * spin_lock_irqsave(host_set lock)
3948 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3950 struct ata_port
*ap
= qc
->ap
;
3953 /* start host DMA transaction */
3954 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3955 outb(dmactl
| ATA_DMA_START
,
3956 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3961 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3962 * @qc: Info associated with this ATA transaction.
3964 * Writes the ATA_DMA_START flag to the DMA command register.
3966 * May be used as the bmdma_start() entry in ata_port_operations.
3969 * spin_lock_irqsave(host_set lock)
3971 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3973 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3974 ata_bmdma_start_mmio(qc
);
3976 ata_bmdma_start_pio(qc
);
3981 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3982 * @qc: Info associated with this ATA transaction.
3984 * Writes address of PRD table to device's PRD Table Address
3985 * register, sets the DMA control register, and calls
3986 * ops->exec_command() to start the transfer.
3988 * May be used as the bmdma_setup() entry in ata_port_operations.
3991 * spin_lock_irqsave(host_set lock)
3993 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3995 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3996 ata_bmdma_setup_mmio(qc
);
3998 ata_bmdma_setup_pio(qc
);
4003 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4004 * @ap: Port associated with this ATA transaction.
4006 * Clear interrupt and error flags in DMA status register.
4008 * May be used as the irq_clear() entry in ata_port_operations.
4011 * spin_lock_irqsave(host_set lock)
4014 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4016 if (ap
->flags
& ATA_FLAG_MMIO
) {
4017 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4018 writeb(readb(mmio
), mmio
);
4020 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4021 outb(inb(addr
), addr
);
4028 * ata_bmdma_status - Read PCI IDE BMDMA status
4029 * @ap: Port associated with this ATA transaction.
4031 * Read and return BMDMA status register.
4033 * May be used as the bmdma_status() entry in ata_port_operations.
4036 * spin_lock_irqsave(host_set lock)
4039 u8
ata_bmdma_status(struct ata_port
*ap
)
4042 if (ap
->flags
& ATA_FLAG_MMIO
) {
4043 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4044 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4046 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4052 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4053 * @qc: Command we are ending DMA for
4055 * Clears the ATA_DMA_START flag in the dma control register
4057 * May be used as the bmdma_stop() entry in ata_port_operations.
4060 * spin_lock_irqsave(host_set lock)
4063 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4065 struct ata_port
*ap
= qc
->ap
;
4066 if (ap
->flags
& ATA_FLAG_MMIO
) {
4067 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4069 /* clear start/stop bit */
4070 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4071 mmio
+ ATA_DMA_CMD
);
4073 /* clear start/stop bit */
4074 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4075 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4078 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4079 ata_altstatus(ap
); /* dummy read */
4083 * ata_host_intr - Handle host interrupt for given (port, task)
4084 * @ap: Port on which interrupt arrived (possibly...)
4085 * @qc: Taskfile currently active in engine
4087 * Handle host interrupt for given queued command. Currently,
4088 * only DMA interrupts are handled. All other commands are
4089 * handled via polling with interrupts disabled (nIEN bit).
4092 * spin_lock_irqsave(host_set lock)
4095 * One if interrupt was handled, zero if not (shared irq).
4098 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4099 struct ata_queued_cmd
*qc
)
4101 u8 status
, host_stat
;
4103 switch (qc
->tf
.protocol
) {
4106 case ATA_PROT_ATAPI_DMA
:
4107 case ATA_PROT_ATAPI
:
4108 /* check status of DMA engine */
4109 host_stat
= ap
->ops
->bmdma_status(ap
);
4110 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4112 /* if it's not our irq... */
4113 if (!(host_stat
& ATA_DMA_INTR
))
4116 /* before we do anything else, clear DMA-Start bit */
4117 ap
->ops
->bmdma_stop(qc
);
4121 case ATA_PROT_ATAPI_NODATA
:
4122 case ATA_PROT_NODATA
:
4123 /* check altstatus */
4124 status
= ata_altstatus(ap
);
4125 if (status
& ATA_BUSY
)
4128 /* check main status, clearing INTRQ */
4129 status
= ata_chk_status(ap
);
4130 if (unlikely(status
& ATA_BUSY
))
4132 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4133 ap
->id
, qc
->tf
.protocol
, status
);
4135 /* ack bmdma irq events */
4136 ap
->ops
->irq_clear(ap
);
4138 /* complete taskfile transaction */
4139 qc
->err_mask
|= ac_err_mask(status
);
4140 ata_qc_complete(qc
);
4147 return 1; /* irq handled */
4150 ap
->stats
.idle_irq
++;
4153 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4155 ata_irq_ack(ap
, 0); /* debug trap */
4156 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4159 return 0; /* irq not handled */
4163 * ata_interrupt - Default ATA host interrupt handler
4164 * @irq: irq line (unused)
4165 * @dev_instance: pointer to our ata_host_set information structure
4168 * Default interrupt handler for PCI IDE devices. Calls
4169 * ata_host_intr() for each port that is not disabled.
4172 * Obtains host_set lock during operation.
4175 * IRQ_NONE or IRQ_HANDLED.
4178 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4180 struct ata_host_set
*host_set
= dev_instance
;
4182 unsigned int handled
= 0;
4183 unsigned long flags
;
4185 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4186 spin_lock_irqsave(&host_set
->lock
, flags
);
4188 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4189 struct ata_port
*ap
;
4191 ap
= host_set
->ports
[i
];
4193 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4194 struct ata_queued_cmd
*qc
;
4196 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4197 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4198 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4199 handled
|= ata_host_intr(ap
, qc
);
4203 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4205 return IRQ_RETVAL(handled
);
4209 * atapi_packet_task - Write CDB bytes to hardware
4210 * @_data: Port to which ATAPI device is attached.
4212 * When device has indicated its readiness to accept
4213 * a CDB, this function is called. Send the CDB.
4214 * If DMA is to be performed, exit immediately.
4215 * Otherwise, we are in polling mode, so poll
4216 * status under operation succeeds or fails.
4219 * Kernel thread context (may sleep)
4222 static void atapi_packet_task(void *_data
)
4224 struct ata_port
*ap
= _data
;
4225 struct ata_queued_cmd
*qc
;
4228 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4229 WARN_ON(qc
== NULL
);
4230 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4232 /* sleep-wait for BSY to clear */
4233 DPRINTK("busy wait\n");
4234 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4235 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4239 /* make sure DRQ is set */
4240 status
= ata_chk_status(ap
);
4241 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4242 qc
->err_mask
|= AC_ERR_HSM
;
4247 DPRINTK("send cdb\n");
4248 WARN_ON(qc
->dev
->cdb_len
< 12);
4250 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4251 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4252 unsigned long flags
;
4254 /* Once we're done issuing command and kicking bmdma,
4255 * irq handler takes over. To not lose irq, we need
4256 * to clear NOINTR flag before sending cdb, but
4257 * interrupt handler shouldn't be invoked before we're
4258 * finished. Hence, the following locking.
4260 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4261 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4262 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4263 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4264 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4265 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4267 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4269 /* PIO commands are handled by polling */
4270 ap
->hsm_task_state
= HSM_ST
;
4271 ata_queue_pio_task(ap
);
4277 ata_poll_qc_complete(qc
);
4282 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4283 * without filling any other registers
4285 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4288 struct ata_taskfile tf
;
4291 ata_tf_init(ap
, &tf
, dev
->devno
);
4294 tf
.flags
|= ATA_TFLAG_DEVICE
;
4295 tf
.protocol
= ATA_PROT_NODATA
;
4297 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4299 printk(KERN_ERR
"%s: ata command failed: %d\n",
4305 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4309 if (!ata_try_flush_cache(dev
))
4312 if (ata_id_has_flush_ext(dev
->id
))
4313 cmd
= ATA_CMD_FLUSH_EXT
;
4315 cmd
= ATA_CMD_FLUSH
;
4317 return ata_do_simple_cmd(ap
, dev
, cmd
);
4320 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4322 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4325 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4327 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4331 * ata_device_resume - wakeup a previously suspended devices
4332 * @ap: port the device is connected to
4333 * @dev: the device to resume
4335 * Kick the drive back into action, by sending it an idle immediate
4336 * command and making sure its transfer mode matches between drive
4340 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4342 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4343 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4346 if (!ata_dev_present(dev
))
4348 if (dev
->class == ATA_DEV_ATA
)
4349 ata_start_drive(ap
, dev
);
4355 * ata_device_suspend - prepare a device for suspend
4356 * @ap: port the device is connected to
4357 * @dev: the device to suspend
4359 * Flush the cache on the drive, if appropriate, then issue a
4360 * standbynow command.
4362 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4364 if (!ata_dev_present(dev
))
4366 if (dev
->class == ATA_DEV_ATA
)
4367 ata_flush_cache(ap
, dev
);
4369 ata_standby_drive(ap
, dev
);
4370 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4375 * ata_port_start - Set port up for dma.
4376 * @ap: Port to initialize
4378 * Called just after data structures for each port are
4379 * initialized. Allocates space for PRD table.
4381 * May be used as the port_start() entry in ata_port_operations.
4384 * Inherited from caller.
4387 int ata_port_start (struct ata_port
*ap
)
4389 struct device
*dev
= ap
->host_set
->dev
;
4392 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4396 rc
= ata_pad_alloc(ap
, dev
);
4398 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4402 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4409 * ata_port_stop - Undo ata_port_start()
4410 * @ap: Port to shut down
4412 * Frees the PRD table.
4414 * May be used as the port_stop() entry in ata_port_operations.
4417 * Inherited from caller.
4420 void ata_port_stop (struct ata_port
*ap
)
4422 struct device
*dev
= ap
->host_set
->dev
;
4424 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4425 ata_pad_free(ap
, dev
);
4428 void ata_host_stop (struct ata_host_set
*host_set
)
4430 if (host_set
->mmio_base
)
4431 iounmap(host_set
->mmio_base
);
4436 * ata_host_remove - Unregister SCSI host structure with upper layers
4437 * @ap: Port to unregister
4438 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4441 * Inherited from caller.
4444 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4446 struct Scsi_Host
*sh
= ap
->host
;
4451 scsi_remove_host(sh
);
4453 ap
->ops
->port_stop(ap
);
4457 * ata_host_init - Initialize an ata_port structure
4458 * @ap: Structure to initialize
4459 * @host: associated SCSI mid-layer structure
4460 * @host_set: Collection of hosts to which @ap belongs
4461 * @ent: Probe information provided by low-level driver
4462 * @port_no: Port number associated with this ata_port
4464 * Initialize a new ata_port structure, and its associated
4468 * Inherited from caller.
4471 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4472 struct ata_host_set
*host_set
,
4473 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4479 host
->max_channel
= 1;
4480 host
->unique_id
= ata_unique_id
++;
4481 host
->max_cmd_len
= 12;
4483 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4484 ap
->id
= host
->unique_id
;
4486 ap
->ctl
= ATA_DEVCTL_OBS
;
4487 ap
->host_set
= host_set
;
4488 ap
->port_no
= port_no
;
4490 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4491 ap
->pio_mask
= ent
->pio_mask
;
4492 ap
->mwdma_mask
= ent
->mwdma_mask
;
4493 ap
->udma_mask
= ent
->udma_mask
;
4494 ap
->flags
|= ent
->host_flags
;
4495 ap
->ops
= ent
->port_ops
;
4496 ap
->cbl
= ATA_CBL_NONE
;
4497 ap
->active_tag
= ATA_TAG_POISON
;
4498 ap
->last_ctl
= 0xFF;
4500 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4501 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4502 INIT_LIST_HEAD(&ap
->eh_done_q
);
4504 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4505 ap
->device
[i
].devno
= i
;
4508 ap
->stats
.unhandled_irq
= 1;
4509 ap
->stats
.idle_irq
= 1;
4512 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4516 * ata_host_add - Attach low-level ATA driver to system
4517 * @ent: Information provided by low-level driver
4518 * @host_set: Collections of ports to which we add
4519 * @port_no: Port number associated with this host
4521 * Attach low-level ATA driver to system.
4524 * PCI/etc. bus probe sem.
4527 * New ata_port on success, for NULL on error.
4530 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4531 struct ata_host_set
*host_set
,
4532 unsigned int port_no
)
4534 struct Scsi_Host
*host
;
4535 struct ata_port
*ap
;
4539 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4543 ap
= (struct ata_port
*) &host
->hostdata
[0];
4545 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4547 rc
= ap
->ops
->port_start(ap
);
4554 scsi_host_put(host
);
4559 * ata_device_add - Register hardware device with ATA and SCSI layers
4560 * @ent: Probe information describing hardware device to be registered
4562 * This function processes the information provided in the probe
4563 * information struct @ent, allocates the necessary ATA and SCSI
4564 * host information structures, initializes them, and registers
4565 * everything with requisite kernel subsystems.
4567 * This function requests irqs, probes the ATA bus, and probes
4571 * PCI/etc. bus probe sem.
4574 * Number of ports registered. Zero on error (no ports registered).
4577 int ata_device_add(const struct ata_probe_ent
*ent
)
4579 unsigned int count
= 0, i
;
4580 struct device
*dev
= ent
->dev
;
4581 struct ata_host_set
*host_set
;
4584 /* alloc a container for our list of ATA ports (buses) */
4585 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4586 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4589 spin_lock_init(&host_set
->lock
);
4591 host_set
->dev
= dev
;
4592 host_set
->n_ports
= ent
->n_ports
;
4593 host_set
->irq
= ent
->irq
;
4594 host_set
->mmio_base
= ent
->mmio_base
;
4595 host_set
->private_data
= ent
->private_data
;
4596 host_set
->ops
= ent
->port_ops
;
4598 /* register each port bound to this device */
4599 for (i
= 0; i
< ent
->n_ports
; i
++) {
4600 struct ata_port
*ap
;
4601 unsigned long xfer_mode_mask
;
4603 ap
= ata_host_add(ent
, host_set
, i
);
4607 host_set
->ports
[i
] = ap
;
4608 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4609 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4610 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4612 /* print per-port info to dmesg */
4613 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4614 "bmdma 0x%lX irq %lu\n",
4616 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4617 ata_mode_string(xfer_mode_mask
),
4618 ap
->ioaddr
.cmd_addr
,
4619 ap
->ioaddr
.ctl_addr
,
4620 ap
->ioaddr
.bmdma_addr
,
4624 host_set
->ops
->irq_clear(ap
);
4631 /* obtain irq, that is shared between channels */
4632 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4633 DRV_NAME
, host_set
))
4636 /* perform each probe synchronously */
4637 DPRINTK("probe begin\n");
4638 for (i
= 0; i
< count
; i
++) {
4639 struct ata_port
*ap
;
4642 ap
= host_set
->ports
[i
];
4644 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4645 rc
= ata_bus_probe(ap
);
4646 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4649 /* FIXME: do something useful here?
4650 * Current libata behavior will
4651 * tear down everything when
4652 * the module is removed
4653 * or the h/w is unplugged.
4657 rc
= scsi_add_host(ap
->host
, dev
);
4659 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4661 /* FIXME: do something useful here */
4662 /* FIXME: handle unconditional calls to
4663 * scsi_scan_host and ata_host_remove, below,
4669 /* probes are done, now scan each port's disk(s) */
4670 DPRINTK("host probe begin\n");
4671 for (i
= 0; i
< count
; i
++) {
4672 struct ata_port
*ap
= host_set
->ports
[i
];
4674 ata_scsi_scan_host(ap
);
4677 dev_set_drvdata(dev
, host_set
);
4679 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4680 return ent
->n_ports
; /* success */
4683 for (i
= 0; i
< count
; i
++) {
4684 ata_host_remove(host_set
->ports
[i
], 1);
4685 scsi_host_put(host_set
->ports
[i
]->host
);
4689 VPRINTK("EXIT, returning 0\n");
4694 * ata_host_set_remove - PCI layer callback for device removal
4695 * @host_set: ATA host set that was removed
4697 * Unregister all objects associated with this host set. Free those
4701 * Inherited from calling layer (may sleep).
4704 void ata_host_set_remove(struct ata_host_set
*host_set
)
4706 struct ata_port
*ap
;
4709 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4710 ap
= host_set
->ports
[i
];
4711 scsi_remove_host(ap
->host
);
4714 free_irq(host_set
->irq
, host_set
);
4716 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4717 ap
= host_set
->ports
[i
];
4719 ata_scsi_release(ap
->host
);
4721 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4722 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4724 if (ioaddr
->cmd_addr
== 0x1f0)
4725 release_region(0x1f0, 8);
4726 else if (ioaddr
->cmd_addr
== 0x170)
4727 release_region(0x170, 8);
4730 scsi_host_put(ap
->host
);
4733 if (host_set
->ops
->host_stop
)
4734 host_set
->ops
->host_stop(host_set
);
4740 * ata_scsi_release - SCSI layer callback hook for host unload
4741 * @host: libata host to be unloaded
4743 * Performs all duties necessary to shut down a libata port...
4744 * Kill port kthread, disable port, and release resources.
4747 * Inherited from SCSI layer.
4753 int ata_scsi_release(struct Scsi_Host
*host
)
4755 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4760 ap
->ops
->port_disable(ap
);
4761 ata_host_remove(ap
, 0);
4762 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4763 kfree(ap
->device
[i
].id
);
4770 * ata_std_ports - initialize ioaddr with standard port offsets.
4771 * @ioaddr: IO address structure to be initialized
4773 * Utility function which initializes data_addr, error_addr,
4774 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4775 * device_addr, status_addr, and command_addr to standard offsets
4776 * relative to cmd_addr.
4778 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4781 void ata_std_ports(struct ata_ioports
*ioaddr
)
4783 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4784 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4785 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4786 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4787 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4788 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4789 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4790 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4791 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4792 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4798 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4800 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4802 pci_iounmap(pdev
, host_set
->mmio_base
);
4806 * ata_pci_remove_one - PCI layer callback for device removal
4807 * @pdev: PCI device that was removed
4809 * PCI layer indicates to libata via this hook that
4810 * hot-unplug or module unload event has occurred.
4811 * Handle this by unregistering all objects associated
4812 * with this PCI device. Free those objects. Then finally
4813 * release PCI resources and disable device.
4816 * Inherited from PCI layer (may sleep).
4819 void ata_pci_remove_one (struct pci_dev
*pdev
)
4821 struct device
*dev
= pci_dev_to_dev(pdev
);
4822 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4824 ata_host_set_remove(host_set
);
4825 pci_release_regions(pdev
);
4826 pci_disable_device(pdev
);
4827 dev_set_drvdata(dev
, NULL
);
4830 /* move to PCI subsystem */
4831 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4833 unsigned long tmp
= 0;
4835 switch (bits
->width
) {
4838 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4844 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4850 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4861 return (tmp
== bits
->val
) ? 1 : 0;
4864 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4866 pci_save_state(pdev
);
4867 pci_disable_device(pdev
);
4868 pci_set_power_state(pdev
, PCI_D3hot
);
4872 int ata_pci_device_resume(struct pci_dev
*pdev
)
4874 pci_set_power_state(pdev
, PCI_D0
);
4875 pci_restore_state(pdev
);
4876 pci_enable_device(pdev
);
4877 pci_set_master(pdev
);
4880 #endif /* CONFIG_PCI */
4883 static int __init
ata_init(void)
4885 ata_wq
= create_workqueue("ata");
4889 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4893 static void __exit
ata_exit(void)
4895 destroy_workqueue(ata_wq
);
4898 module_init(ata_init
);
4899 module_exit(ata_exit
);
4901 static unsigned long ratelimit_time
;
4902 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4904 int ata_ratelimit(void)
4907 unsigned long flags
;
4909 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4911 if (time_after(jiffies
, ratelimit_time
)) {
4913 ratelimit_time
= jiffies
+ (HZ
/5);
4917 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4923 * libata is essentially a library of internal helper functions for
4924 * low-level ATA host controller drivers. As such, the API/ABI is
4925 * likely to change as new drivers are added and updated.
4926 * Do not depend on ABI/API stability.
4929 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4930 EXPORT_SYMBOL_GPL(ata_std_ports
);
4931 EXPORT_SYMBOL_GPL(ata_device_add
);
4932 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4933 EXPORT_SYMBOL_GPL(ata_sg_init
);
4934 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4935 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
4936 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4937 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4938 EXPORT_SYMBOL_GPL(ata_tf_load
);
4939 EXPORT_SYMBOL_GPL(ata_tf_read
);
4940 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4941 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4942 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4943 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4944 EXPORT_SYMBOL_GPL(ata_check_status
);
4945 EXPORT_SYMBOL_GPL(ata_altstatus
);
4946 EXPORT_SYMBOL_GPL(ata_exec_command
);
4947 EXPORT_SYMBOL_GPL(ata_port_start
);
4948 EXPORT_SYMBOL_GPL(ata_port_stop
);
4949 EXPORT_SYMBOL_GPL(ata_host_stop
);
4950 EXPORT_SYMBOL_GPL(ata_interrupt
);
4951 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4952 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4953 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4954 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4955 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4956 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4957 EXPORT_SYMBOL_GPL(ata_port_probe
);
4958 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4959 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4960 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4961 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
4962 EXPORT_SYMBOL_GPL(ata_std_softreset
);
4963 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
4964 EXPORT_SYMBOL_GPL(ata_std_postreset
);
4965 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
4966 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
4967 EXPORT_SYMBOL_GPL(ata_port_disable
);
4968 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4969 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
4970 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4971 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4972 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
4973 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4974 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4975 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4976 EXPORT_SYMBOL_GPL(ata_host_intr
);
4977 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4978 EXPORT_SYMBOL_GPL(ata_id_string
);
4979 EXPORT_SYMBOL_GPL(ata_id_c_string
);
4980 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4981 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
4982 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
4984 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
4985 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4986 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4989 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4990 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4991 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4992 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4993 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4994 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
4995 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
4996 #endif /* CONFIG_PCI */
4998 EXPORT_SYMBOL_GPL(ata_device_suspend
);
4999 EXPORT_SYMBOL_GPL(ata_device_resume
);
5000 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5001 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);