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 * @id: buffer to fill IDENTIFY page into
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
*id
)
931 unsigned int class = *p_class
;
932 unsigned int using_edd
;
933 struct ata_taskfile tf
;
934 unsigned int err_mask
= 0;
938 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
940 if (ap
->ops
->probe_reset
||
941 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
946 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
949 ata_tf_init(ap
, &tf
, dev
->devno
);
953 tf
.command
= ATA_CMD_ID_ATA
;
956 tf
.command
= ATA_CMD_ID_ATAPI
;
960 reason
= "unsupported class";
964 tf
.protocol
= ATA_PROT_PIO
;
966 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
967 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
971 reason
= "I/O error";
973 if (err_mask
& ~AC_ERR_DEV
)
977 * arg! EDD works for all test cases, but seems to return
978 * the ATA signature for some ATAPI devices. Until the
979 * reason for this is found and fixed, we fix up the mess
980 * here. If IDENTIFY DEVICE returns command aborted
981 * (as ATAPI devices do), then we issue an
982 * IDENTIFY PACKET DEVICE.
984 * ATA software reset (SRST, the default) does not appear
985 * to have this problem.
987 if ((using_edd
) && (class == ATA_DEV_ATA
)) {
989 if (err
& ATA_ABORTED
) {
990 class = ATA_DEV_ATAPI
;
997 swap_buf_le16(id
, ATA_ID_WORDS
);
999 /* print device capabilities */
1000 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1001 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1003 id
[49], id
[82], id
[83], id
[84], id
[85], id
[86], id
[87], id
[88]);
1006 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1008 reason
= "device reports illegal type";
1012 if (post_reset
&& class == ATA_DEV_ATA
) {
1014 * The exact sequence expected by certain pre-ATA4 drives is:
1017 * INITIALIZE DEVICE PARAMETERS
1019 * Some drives were very specific about that exact sequence.
1021 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1022 err_mask
= ata_dev_init_params(ap
, dev
);
1025 reason
= "INIT_DEV_PARAMS failed";
1029 /* current CHS translation info (id[53-58]) might be
1030 * changed. reread the identify device info.
1041 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1042 ap
->id
, dev
->devno
, reason
);
1047 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1048 * @ap: port on which device we wish to probe resides
1049 * @device: device bus address, starting at zero
1051 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1052 * command, and read back the 512-byte device information page.
1053 * The device information page is fed to us via the standard
1054 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1055 * using standard PIO-IN paths)
1057 * After reading the device information page, we use several
1058 * bits of information from it to initialize data structures
1059 * that will be used during the lifetime of the ata_device.
1060 * Other data from the info page is used to disqualify certain
1061 * older ATA devices we do not wish to support.
1064 * Inherited from caller. Some functions called by this function
1065 * obtain the host_set lock.
1068 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1070 struct ata_device
*dev
= &ap
->device
[device
];
1071 unsigned long xfer_modes
;
1074 if (!ata_dev_present(dev
)) {
1075 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1080 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1082 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, dev
->id
);
1087 * common ATA, ATAPI feature tests
1090 /* we require DMA support (bits 8 of word 49) */
1091 if (!ata_id_has_dma(dev
->id
)) {
1092 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1096 /* quick-n-dirty find max transfer mode; for printk only */
1097 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1099 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1101 xfer_modes
= ata_pio_modes(dev
);
1103 ata_dump_id(dev
->id
);
1105 /* ATA-specific feature tests */
1106 if (dev
->class == ATA_DEV_ATA
) {
1107 dev
->n_sectors
= ata_id_n_sectors(dev
->id
);
1109 if (ata_id_has_lba(dev
->id
)) {
1110 dev
->flags
|= ATA_DFLAG_LBA
;
1112 if (ata_id_has_lba48(dev
->id
))
1113 dev
->flags
|= ATA_DFLAG_LBA48
;
1115 /* print device info to dmesg */
1116 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1118 ata_id_major_version(dev
->id
),
1119 ata_mode_string(xfer_modes
),
1120 (unsigned long long)dev
->n_sectors
,
1121 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1125 /* Default translation */
1126 dev
->cylinders
= dev
->id
[1];
1127 dev
->heads
= dev
->id
[3];
1128 dev
->sectors
= dev
->id
[6];
1130 if (ata_id_current_chs_valid(dev
->id
)) {
1131 /* Current CHS translation is valid. */
1132 dev
->cylinders
= dev
->id
[54];
1133 dev
->heads
= dev
->id
[55];
1134 dev
->sectors
= dev
->id
[56];
1137 /* print device info to dmesg */
1138 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1140 ata_id_major_version(dev
->id
),
1141 ata_mode_string(xfer_modes
),
1142 (unsigned long long)dev
->n_sectors
,
1143 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1150 /* ATAPI-specific feature tests */
1151 else if (dev
->class == ATA_DEV_ATAPI
) {
1152 rc
= atapi_cdb_len(dev
->id
);
1153 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1154 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1157 dev
->cdb_len
= (unsigned int) rc
;
1159 /* print device info to dmesg */
1160 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1162 ata_mode_string(xfer_modes
));
1165 ap
->host
->max_cmd_len
= 0;
1166 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1167 ap
->host
->max_cmd_len
= max_t(unsigned int,
1168 ap
->host
->max_cmd_len
,
1169 ap
->device
[i
].cdb_len
);
1171 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1175 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1178 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1179 DPRINTK("EXIT, err\n");
1183 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1184 struct ata_device
*dev
)
1186 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1190 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1197 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1199 /* limit bridge transfers to udma5, 200 sectors */
1200 if (ata_dev_knobble(ap
, &ap
->device
[i
])) {
1201 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1203 ap
->udma_mask
&= ATA_UDMA5
;
1204 ap
->device
[i
].max_sectors
= ATA_MAX_SECTORS
;
1207 if (ap
->ops
->dev_config
)
1208 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1212 * ata_bus_probe - Reset and probe ATA bus
1215 * Master ATA bus probing function. Initiates a hardware-dependent
1216 * bus reset, then attempts to identify any devices found on
1220 * PCI/etc. bus probe sem.
1223 * Zero on success, non-zero on error.
1226 static int ata_bus_probe(struct ata_port
*ap
)
1228 unsigned int i
, found
= 0;
1230 if (ap
->ops
->probe_reset
) {
1231 unsigned int classes
[ATA_MAX_DEVICES
];
1236 rc
= ap
->ops
->probe_reset(ap
, classes
);
1238 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1239 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1240 classes
[i
] = ATA_DEV_NONE
;
1241 ap
->device
[i
].class = classes
[i
];
1244 printk(KERN_ERR
"ata%u: probe reset failed, "
1245 "disabling port\n", ap
->id
);
1246 ata_port_disable(ap
);
1249 ap
->ops
->phy_reset(ap
);
1251 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1254 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1255 ata_dev_identify(ap
, i
);
1256 if (ata_dev_present(&ap
->device
[i
])) {
1258 ata_dev_config(ap
,i
);
1262 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1263 goto err_out_disable
;
1266 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1267 goto err_out_disable
;
1272 ap
->ops
->port_disable(ap
);
1278 * ata_port_probe - Mark port as enabled
1279 * @ap: Port for which we indicate enablement
1281 * Modify @ap data structure such that the system
1282 * thinks that the entire port is enabled.
1284 * LOCKING: host_set lock, or some other form of
1288 void ata_port_probe(struct ata_port
*ap
)
1290 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1294 * sata_print_link_status - Print SATA link status
1295 * @ap: SATA port to printk link status about
1297 * This function prints link speed and status of a SATA link.
1302 static void sata_print_link_status(struct ata_port
*ap
)
1307 if (!ap
->ops
->scr_read
)
1310 sstatus
= scr_read(ap
, SCR_STATUS
);
1312 if (sata_dev_present(ap
)) {
1313 tmp
= (sstatus
>> 4) & 0xf;
1316 else if (tmp
& (1 << 1))
1319 speed
= "<unknown>";
1320 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1321 ap
->id
, speed
, sstatus
);
1323 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1329 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1330 * @ap: SATA port associated with target SATA PHY.
1332 * This function issues commands to standard SATA Sxxx
1333 * PHY registers, to wake up the phy (and device), and
1334 * clear any reset condition.
1337 * PCI/etc. bus probe sem.
1340 void __sata_phy_reset(struct ata_port
*ap
)
1343 unsigned long timeout
= jiffies
+ (HZ
* 5);
1345 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1346 /* issue phy wake/reset */
1347 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1348 /* Couldn't find anything in SATA I/II specs, but
1349 * AHCI-1.1 10.4.2 says at least 1 ms. */
1352 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1354 /* wait for phy to become ready, if necessary */
1357 sstatus
= scr_read(ap
, SCR_STATUS
);
1358 if ((sstatus
& 0xf) != 1)
1360 } while (time_before(jiffies
, timeout
));
1362 /* print link status */
1363 sata_print_link_status(ap
);
1365 /* TODO: phy layer with polling, timeouts, etc. */
1366 if (sata_dev_present(ap
))
1369 ata_port_disable(ap
);
1371 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1374 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1375 ata_port_disable(ap
);
1379 ap
->cbl
= ATA_CBL_SATA
;
1383 * sata_phy_reset - Reset SATA bus.
1384 * @ap: SATA port associated with target SATA PHY.
1386 * This function resets the SATA bus, and then probes
1387 * the bus for devices.
1390 * PCI/etc. bus probe sem.
1393 void sata_phy_reset(struct ata_port
*ap
)
1395 __sata_phy_reset(ap
);
1396 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1402 * ata_port_disable - Disable port.
1403 * @ap: Port to be disabled.
1405 * Modify @ap data structure such that the system
1406 * thinks that the entire port is disabled, and should
1407 * never attempt to probe or communicate with devices
1410 * LOCKING: host_set lock, or some other form of
1414 void ata_port_disable(struct ata_port
*ap
)
1416 ap
->device
[0].class = ATA_DEV_NONE
;
1417 ap
->device
[1].class = ATA_DEV_NONE
;
1418 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1422 * This mode timing computation functionality is ported over from
1423 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1426 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1427 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1428 * for PIO 5, which is a nonstandard extension and UDMA6, which
1429 * is currently supported only by Maxtor drives.
1432 static const struct ata_timing ata_timing
[] = {
1434 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1435 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1436 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1437 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1439 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1440 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1441 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1443 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1445 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1446 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1447 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1449 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1450 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1451 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1453 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1454 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1455 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1457 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1458 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1459 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1461 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1466 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1467 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1469 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1471 q
->setup
= EZ(t
->setup
* 1000, T
);
1472 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1473 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1474 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1475 q
->active
= EZ(t
->active
* 1000, T
);
1476 q
->recover
= EZ(t
->recover
* 1000, T
);
1477 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1478 q
->udma
= EZ(t
->udma
* 1000, UT
);
1481 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1482 struct ata_timing
*m
, unsigned int what
)
1484 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1485 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1486 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1487 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1488 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1489 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1490 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1491 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1494 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1496 const struct ata_timing
*t
;
1498 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1499 if (t
->mode
== 0xFF)
1504 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1505 struct ata_timing
*t
, int T
, int UT
)
1507 const struct ata_timing
*s
;
1508 struct ata_timing p
;
1514 if (!(s
= ata_timing_find_mode(speed
)))
1517 memcpy(t
, s
, sizeof(*s
));
1520 * If the drive is an EIDE drive, it can tell us it needs extended
1521 * PIO/MW_DMA cycle timing.
1524 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1525 memset(&p
, 0, sizeof(p
));
1526 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1527 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1528 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1529 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1530 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1532 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1536 * Convert the timing to bus clock counts.
1539 ata_timing_quantize(t
, t
, T
, UT
);
1542 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1543 * S.M.A.R.T * and some other commands. We have to ensure that the
1544 * DMA cycle timing is slower/equal than the fastest PIO timing.
1547 if (speed
> XFER_PIO_4
) {
1548 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1549 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1553 * Lengthen active & recovery time so that cycle time is correct.
1556 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1557 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1558 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1561 if (t
->active
+ t
->recover
< t
->cycle
) {
1562 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1563 t
->recover
= t
->cycle
- t
->active
;
1569 static const struct {
1572 } xfer_mode_classes
[] = {
1573 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1574 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1575 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1578 static u8
base_from_shift(unsigned int shift
)
1582 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1583 if (xfer_mode_classes
[i
].shift
== shift
)
1584 return xfer_mode_classes
[i
].base
;
1589 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1594 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1597 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1598 dev
->flags
|= ATA_DFLAG_PIO
;
1600 ata_dev_set_xfermode(ap
, dev
);
1602 base
= base_from_shift(dev
->xfer_shift
);
1603 ofs
= dev
->xfer_mode
- base
;
1604 idx
= ofs
+ dev
->xfer_shift
;
1605 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1607 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1608 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1610 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1611 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1614 static int ata_host_set_pio(struct ata_port
*ap
)
1620 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1623 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1627 base
= base_from_shift(ATA_SHIFT_PIO
);
1628 xfer_mode
= base
+ x
;
1630 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1631 (int)base
, (int)xfer_mode
, mask
, x
);
1633 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1634 struct ata_device
*dev
= &ap
->device
[i
];
1635 if (ata_dev_present(dev
)) {
1636 dev
->pio_mode
= xfer_mode
;
1637 dev
->xfer_mode
= xfer_mode
;
1638 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1639 if (ap
->ops
->set_piomode
)
1640 ap
->ops
->set_piomode(ap
, dev
);
1647 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1648 unsigned int xfer_shift
)
1652 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1653 struct ata_device
*dev
= &ap
->device
[i
];
1654 if (ata_dev_present(dev
)) {
1655 dev
->dma_mode
= xfer_mode
;
1656 dev
->xfer_mode
= xfer_mode
;
1657 dev
->xfer_shift
= xfer_shift
;
1658 if (ap
->ops
->set_dmamode
)
1659 ap
->ops
->set_dmamode(ap
, dev
);
1665 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1666 * @ap: port on which timings will be programmed
1668 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1671 * PCI/etc. bus probe sem.
1673 static void ata_set_mode(struct ata_port
*ap
)
1675 unsigned int xfer_shift
;
1679 /* step 1: always set host PIO timings */
1680 rc
= ata_host_set_pio(ap
);
1684 /* step 2: choose the best data xfer mode */
1685 xfer_mode
= xfer_shift
= 0;
1686 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1690 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1691 if (xfer_shift
!= ATA_SHIFT_PIO
)
1692 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1694 /* step 4: update devices' xfer mode */
1695 ata_dev_set_mode(ap
, &ap
->device
[0]);
1696 ata_dev_set_mode(ap
, &ap
->device
[1]);
1698 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1701 if (ap
->ops
->post_set_mode
)
1702 ap
->ops
->post_set_mode(ap
);
1707 ata_port_disable(ap
);
1711 * ata_tf_to_host - issue ATA taskfile to host controller
1712 * @ap: port to which command is being issued
1713 * @tf: ATA taskfile register set
1715 * Issues ATA taskfile register set to ATA host controller,
1716 * with proper synchronization with interrupt handler and
1720 * spin_lock_irqsave(host_set lock)
1723 static inline void ata_tf_to_host(struct ata_port
*ap
,
1724 const struct ata_taskfile
*tf
)
1726 ap
->ops
->tf_load(ap
, tf
);
1727 ap
->ops
->exec_command(ap
, tf
);
1731 * ata_busy_sleep - sleep until BSY clears, or timeout
1732 * @ap: port containing status register to be polled
1733 * @tmout_pat: impatience timeout
1734 * @tmout: overall timeout
1736 * Sleep until ATA Status register bit BSY clears,
1737 * or a timeout occurs.
1742 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1743 unsigned long tmout_pat
, unsigned long tmout
)
1745 unsigned long timer_start
, timeout
;
1748 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1749 timer_start
= jiffies
;
1750 timeout
= timer_start
+ tmout_pat
;
1751 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1753 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1756 if (status
& ATA_BUSY
)
1757 printk(KERN_WARNING
"ata%u is slow to respond, "
1758 "please be patient\n", ap
->id
);
1760 timeout
= timer_start
+ tmout
;
1761 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1763 status
= ata_chk_status(ap
);
1766 if (status
& ATA_BUSY
) {
1767 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1768 ap
->id
, tmout
/ HZ
);
1775 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1777 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1778 unsigned int dev0
= devmask
& (1 << 0);
1779 unsigned int dev1
= devmask
& (1 << 1);
1780 unsigned long timeout
;
1782 /* if device 0 was found in ata_devchk, wait for its
1786 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1788 /* if device 1 was found in ata_devchk, wait for
1789 * register access, then wait for BSY to clear
1791 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1795 ap
->ops
->dev_select(ap
, 1);
1796 if (ap
->flags
& ATA_FLAG_MMIO
) {
1797 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1798 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1800 nsect
= inb(ioaddr
->nsect_addr
);
1801 lbal
= inb(ioaddr
->lbal_addr
);
1803 if ((nsect
== 1) && (lbal
== 1))
1805 if (time_after(jiffies
, timeout
)) {
1809 msleep(50); /* give drive a breather */
1812 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1814 /* is all this really necessary? */
1815 ap
->ops
->dev_select(ap
, 0);
1817 ap
->ops
->dev_select(ap
, 1);
1819 ap
->ops
->dev_select(ap
, 0);
1823 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1824 * @ap: Port to reset and probe
1826 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1827 * probe the bus. Not often used these days.
1830 * PCI/etc. bus probe sem.
1831 * Obtains host_set lock.
1835 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1837 struct ata_taskfile tf
;
1838 unsigned long flags
;
1840 /* set up execute-device-diag (bus reset) taskfile */
1841 /* also, take interrupts to a known state (disabled) */
1842 DPRINTK("execute-device-diag\n");
1843 ata_tf_init(ap
, &tf
, 0);
1845 tf
.command
= ATA_CMD_EDD
;
1846 tf
.protocol
= ATA_PROT_NODATA
;
1849 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1850 ata_tf_to_host(ap
, &tf
);
1851 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1853 /* spec says at least 2ms. but who knows with those
1854 * crazy ATAPI devices...
1858 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1861 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1862 unsigned int devmask
)
1864 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1866 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1868 /* software reset. causes dev0 to be selected */
1869 if (ap
->flags
& ATA_FLAG_MMIO
) {
1870 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1871 udelay(20); /* FIXME: flush */
1872 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1873 udelay(20); /* FIXME: flush */
1874 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1876 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1878 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1880 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1883 /* spec mandates ">= 2ms" before checking status.
1884 * We wait 150ms, because that was the magic delay used for
1885 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1886 * between when the ATA command register is written, and then
1887 * status is checked. Because waiting for "a while" before
1888 * checking status is fine, post SRST, we perform this magic
1889 * delay here as well.
1893 ata_bus_post_reset(ap
, devmask
);
1899 * ata_bus_reset - reset host port and associated ATA channel
1900 * @ap: port to reset
1902 * This is typically the first time we actually start issuing
1903 * commands to the ATA channel. We wait for BSY to clear, then
1904 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1905 * result. Determine what devices, if any, are on the channel
1906 * by looking at the device 0/1 error register. Look at the signature
1907 * stored in each device's taskfile registers, to determine if
1908 * the device is ATA or ATAPI.
1911 * PCI/etc. bus probe sem.
1912 * Obtains host_set lock.
1915 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1918 void ata_bus_reset(struct ata_port
*ap
)
1920 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1921 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1923 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1925 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1927 /* determine if device 0/1 are present */
1928 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1931 dev0
= ata_devchk(ap
, 0);
1933 dev1
= ata_devchk(ap
, 1);
1937 devmask
|= (1 << 0);
1939 devmask
|= (1 << 1);
1941 /* select device 0 again */
1942 ap
->ops
->dev_select(ap
, 0);
1944 /* issue bus reset */
1945 if (ap
->flags
& ATA_FLAG_SRST
)
1946 rc
= ata_bus_softreset(ap
, devmask
);
1947 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1948 /* set up device control */
1949 if (ap
->flags
& ATA_FLAG_MMIO
)
1950 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1952 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1953 rc
= ata_bus_edd(ap
);
1960 * determine by signature whether we have ATA or ATAPI devices
1962 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1963 if ((slave_possible
) && (err
!= 0x81))
1964 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1966 /* re-enable interrupts */
1967 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1970 /* is double-select really necessary? */
1971 if (ap
->device
[1].class != ATA_DEV_NONE
)
1972 ap
->ops
->dev_select(ap
, 1);
1973 if (ap
->device
[0].class != ATA_DEV_NONE
)
1974 ap
->ops
->dev_select(ap
, 0);
1976 /* if no devices were detected, disable this port */
1977 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1978 (ap
->device
[1].class == ATA_DEV_NONE
))
1981 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
1982 /* set up device control for ATA_FLAG_SATA_RESET */
1983 if (ap
->flags
& ATA_FLAG_MMIO
)
1984 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1986 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1993 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
1994 ap
->ops
->port_disable(ap
);
1999 static int sata_phy_resume(struct ata_port
*ap
)
2001 unsigned long timeout
= jiffies
+ (HZ
* 5);
2004 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2006 /* Wait for phy to become ready, if necessary. */
2009 sstatus
= scr_read(ap
, SCR_STATUS
);
2010 if ((sstatus
& 0xf) != 1)
2012 } while (time_before(jiffies
, timeout
));
2018 * ata_std_probeinit - initialize probing
2019 * @ap: port to be probed
2021 * @ap is about to be probed. Initialize it. This function is
2022 * to be used as standard callback for ata_drive_probe_reset().
2024 * NOTE!!! Do not use this function as probeinit if a low level
2025 * driver implements only hardreset. Just pass NULL as probeinit
2026 * in that case. Using this function is probably okay but doing
2027 * so makes reset sequence different from the original
2028 * ->phy_reset implementation and Jeff nervous. :-P
2030 extern void ata_std_probeinit(struct ata_port
*ap
)
2032 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2033 sata_phy_resume(ap
);
2034 if (sata_dev_present(ap
))
2035 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2040 * ata_std_softreset - reset host port via ATA SRST
2041 * @ap: port to reset
2042 * @verbose: fail verbosely
2043 * @classes: resulting classes of attached devices
2045 * Reset host port using ATA SRST. This function is to be used
2046 * as standard callback for ata_drive_*_reset() functions.
2049 * Kernel thread context (may sleep)
2052 * 0 on success, -errno otherwise.
2054 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2056 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2057 unsigned int devmask
= 0, err_mask
;
2062 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2063 classes
[0] = ATA_DEV_NONE
;
2067 /* determine if device 0/1 are present */
2068 if (ata_devchk(ap
, 0))
2069 devmask
|= (1 << 0);
2070 if (slave_possible
&& ata_devchk(ap
, 1))
2071 devmask
|= (1 << 1);
2073 /* select device 0 again */
2074 ap
->ops
->dev_select(ap
, 0);
2076 /* issue bus reset */
2077 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2078 err_mask
= ata_bus_softreset(ap
, devmask
);
2081 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2084 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2089 /* determine by signature whether we have ATA or ATAPI devices */
2090 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2091 if (slave_possible
&& err
!= 0x81)
2092 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2095 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2100 * sata_std_hardreset - reset host port via SATA phy reset
2101 * @ap: port to reset
2102 * @verbose: fail verbosely
2103 * @class: resulting class of attached device
2105 * SATA phy-reset host port using DET bits of SControl register.
2106 * This function is to be used as standard callback for
2107 * ata_drive_*_reset().
2110 * Kernel thread context (may sleep)
2113 * 0 on success, -errno otherwise.
2115 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2119 /* Issue phy wake/reset */
2120 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2123 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2124 * 10.4.2 says at least 1 ms.
2128 /* Bring phy back */
2129 sata_phy_resume(ap
);
2131 /* TODO: phy layer with polling, timeouts, etc. */
2132 if (!sata_dev_present(ap
)) {
2133 *class = ATA_DEV_NONE
;
2134 DPRINTK("EXIT, link offline\n");
2138 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2140 printk(KERN_ERR
"ata%u: COMRESET failed "
2141 "(device not ready)\n", ap
->id
);
2143 DPRINTK("EXIT, device not ready\n");
2147 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2149 *class = ata_dev_try_classify(ap
, 0, NULL
);
2151 DPRINTK("EXIT, class=%u\n", *class);
2156 * ata_std_postreset - standard postreset callback
2157 * @ap: the target ata_port
2158 * @classes: classes of attached devices
2160 * This function is invoked after a successful reset. Note that
2161 * the device might have been reset more than once using
2162 * different reset methods before postreset is invoked.
2164 * This function is to be used as standard callback for
2165 * ata_drive_*_reset().
2168 * Kernel thread context (may sleep)
2170 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2174 /* set cable type if it isn't already set */
2175 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2176 ap
->cbl
= ATA_CBL_SATA
;
2178 /* print link status */
2179 if (ap
->cbl
== ATA_CBL_SATA
)
2180 sata_print_link_status(ap
);
2182 /* re-enable interrupts */
2183 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2186 /* is double-select really necessary? */
2187 if (classes
[0] != ATA_DEV_NONE
)
2188 ap
->ops
->dev_select(ap
, 1);
2189 if (classes
[1] != ATA_DEV_NONE
)
2190 ap
->ops
->dev_select(ap
, 0);
2192 /* bail out if no device is present */
2193 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2194 DPRINTK("EXIT, no device\n");
2198 /* set up device control */
2199 if (ap
->ioaddr
.ctl_addr
) {
2200 if (ap
->flags
& ATA_FLAG_MMIO
)
2201 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2203 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2210 * ata_std_probe_reset - standard probe reset method
2211 * @ap: prot to perform probe-reset
2212 * @classes: resulting classes of attached devices
2214 * The stock off-the-shelf ->probe_reset method.
2217 * Kernel thread context (may sleep)
2220 * 0 on success, -errno otherwise.
2222 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2224 ata_reset_fn_t hardreset
;
2227 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2228 hardreset
= sata_std_hardreset
;
2230 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2231 ata_std_softreset
, hardreset
,
2232 ata_std_postreset
, classes
);
2235 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2236 ata_postreset_fn_t postreset
,
2237 unsigned int *classes
)
2241 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2242 classes
[i
] = ATA_DEV_UNKNOWN
;
2244 rc
= reset(ap
, 0, classes
);
2248 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2249 * is complete and convert all ATA_DEV_UNKNOWN to
2252 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2253 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2256 if (i
< ATA_MAX_DEVICES
)
2257 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2258 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2259 classes
[i
] = ATA_DEV_NONE
;
2262 postreset(ap
, classes
);
2264 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2268 * ata_drive_probe_reset - Perform probe reset with given methods
2269 * @ap: port to reset
2270 * @probeinit: probeinit method (can be NULL)
2271 * @softreset: softreset method (can be NULL)
2272 * @hardreset: hardreset method (can be NULL)
2273 * @postreset: postreset method (can be NULL)
2274 * @classes: resulting classes of attached devices
2276 * Reset the specified port and classify attached devices using
2277 * given methods. This function prefers softreset but tries all
2278 * possible reset sequences to reset and classify devices. This
2279 * function is intended to be used for constructing ->probe_reset
2280 * callback by low level drivers.
2282 * Reset methods should follow the following rules.
2284 * - Return 0 on sucess, -errno on failure.
2285 * - If classification is supported, fill classes[] with
2286 * recognized class codes.
2287 * - If classification is not supported, leave classes[] alone.
2288 * - If verbose is non-zero, print error message on failure;
2289 * otherwise, shut up.
2292 * Kernel thread context (may sleep)
2295 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2296 * if classification fails, and any error code from reset
2299 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2300 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2301 ata_postreset_fn_t postreset
, unsigned int *classes
)
2309 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2317 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2318 if (rc
== 0 || rc
!= -ENODEV
)
2322 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2327 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2328 const struct ata_device
*dev
)
2330 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2331 ap
->id
, dev
->devno
);
2334 static const char * const ata_dma_blacklist
[] = {
2353 "Toshiba CD-ROM XM-6202B",
2354 "TOSHIBA CD-ROM XM-1702BC",
2356 "E-IDE CD-ROM CR-840",
2359 "SAMSUNG CD-ROM SC-148C",
2360 "SAMSUNG CD-ROM SC",
2362 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2366 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2368 unsigned char model_num
[41];
2371 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2373 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2374 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2380 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2382 const struct ata_device
*master
, *slave
;
2385 master
= &ap
->device
[0];
2386 slave
= &ap
->device
[1];
2388 WARN_ON(!ata_dev_present(master
) && !ata_dev_present(slave
));
2390 if (shift
== ATA_SHIFT_UDMA
) {
2391 mask
= ap
->udma_mask
;
2392 if (ata_dev_present(master
)) {
2393 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2394 if (ata_dma_blacklisted(master
)) {
2396 ata_pr_blacklisted(ap
, master
);
2399 if (ata_dev_present(slave
)) {
2400 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2401 if (ata_dma_blacklisted(slave
)) {
2403 ata_pr_blacklisted(ap
, slave
);
2407 else if (shift
== ATA_SHIFT_MWDMA
) {
2408 mask
= ap
->mwdma_mask
;
2409 if (ata_dev_present(master
)) {
2410 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2411 if (ata_dma_blacklisted(master
)) {
2413 ata_pr_blacklisted(ap
, master
);
2416 if (ata_dev_present(slave
)) {
2417 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2418 if (ata_dma_blacklisted(slave
)) {
2420 ata_pr_blacklisted(ap
, slave
);
2424 else if (shift
== ATA_SHIFT_PIO
) {
2425 mask
= ap
->pio_mask
;
2426 if (ata_dev_present(master
)) {
2427 /* spec doesn't return explicit support for
2428 * PIO0-2, so we fake it
2430 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2435 if (ata_dev_present(slave
)) {
2436 /* spec doesn't return explicit support for
2437 * PIO0-2, so we fake it
2439 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2446 mask
= 0xffffffff; /* shut up compiler warning */
2453 /* find greatest bit */
2454 static int fgb(u32 bitmap
)
2459 for (i
= 0; i
< 32; i
++)
2460 if (bitmap
& (1 << i
))
2467 * ata_choose_xfer_mode - attempt to find best transfer mode
2468 * @ap: Port for which an xfer mode will be selected
2469 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2470 * @xfer_shift_out: (output) bit shift that selects this mode
2472 * Based on host and device capabilities, determine the
2473 * maximum transfer mode that is amenable to all.
2476 * PCI/etc. bus probe sem.
2479 * Zero on success, negative on error.
2482 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2484 unsigned int *xfer_shift_out
)
2486 unsigned int mask
, shift
;
2489 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2490 shift
= xfer_mode_classes
[i
].shift
;
2491 mask
= ata_get_mode_mask(ap
, shift
);
2495 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2496 *xfer_shift_out
= shift
;
2505 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2506 * @ap: Port associated with device @dev
2507 * @dev: Device to which command will be sent
2509 * Issue SET FEATURES - XFER MODE command to device @dev
2513 * PCI/etc. bus probe sem.
2516 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2518 struct ata_taskfile tf
;
2520 /* set up set-features taskfile */
2521 DPRINTK("set features - xfer mode\n");
2523 ata_tf_init(ap
, &tf
, dev
->devno
);
2524 tf
.command
= ATA_CMD_SET_FEATURES
;
2525 tf
.feature
= SETFEATURES_XFER
;
2526 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2527 tf
.protocol
= ATA_PROT_NODATA
;
2528 tf
.nsect
= dev
->xfer_mode
;
2530 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2531 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2533 ata_port_disable(ap
);
2540 * ata_dev_init_params - Issue INIT DEV PARAMS command
2541 * @ap: Port associated with device @dev
2542 * @dev: Device to which command will be sent
2545 * Kernel thread context (may sleep)
2548 * 0 on success, AC_ERR_* mask otherwise.
2551 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2552 struct ata_device
*dev
)
2554 struct ata_taskfile tf
;
2555 unsigned int err_mask
;
2556 u16 sectors
= dev
->id
[6];
2557 u16 heads
= dev
->id
[3];
2559 /* Number of sectors per track 1-255. Number of heads 1-16 */
2560 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2563 /* set up init dev params taskfile */
2564 DPRINTK("init dev params \n");
2566 ata_tf_init(ap
, &tf
, dev
->devno
);
2567 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2568 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2569 tf
.protocol
= ATA_PROT_NODATA
;
2571 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2573 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2575 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2580 * ata_sg_clean - Unmap DMA memory associated with command
2581 * @qc: Command containing DMA memory to be released
2583 * Unmap all mapped DMA memory associated with this command.
2586 * spin_lock_irqsave(host_set lock)
2589 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2591 struct ata_port
*ap
= qc
->ap
;
2592 struct scatterlist
*sg
= qc
->__sg
;
2593 int dir
= qc
->dma_dir
;
2594 void *pad_buf
= NULL
;
2596 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2597 WARN_ON(sg
== NULL
);
2599 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2600 WARN_ON(qc
->n_elem
> 1);
2602 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2604 /* if we padded the buffer out to 32-bit bound, and data
2605 * xfer direction is from-device, we must copy from the
2606 * pad buffer back into the supplied buffer
2608 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2609 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2611 if (qc
->flags
& ATA_QCFLAG_SG
) {
2613 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2614 /* restore last sg */
2615 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2617 struct scatterlist
*psg
= &qc
->pad_sgent
;
2618 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2619 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2620 kunmap_atomic(addr
, KM_IRQ0
);
2624 dma_unmap_single(ap
->host_set
->dev
,
2625 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2628 sg
->length
+= qc
->pad_len
;
2630 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2631 pad_buf
, qc
->pad_len
);
2634 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2639 * ata_fill_sg - Fill PCI IDE PRD table
2640 * @qc: Metadata associated with taskfile to be transferred
2642 * Fill PCI IDE PRD (scatter-gather) table with segments
2643 * associated with the current disk command.
2646 * spin_lock_irqsave(host_set lock)
2649 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2651 struct ata_port
*ap
= qc
->ap
;
2652 struct scatterlist
*sg
;
2655 WARN_ON(qc
->__sg
== NULL
);
2656 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2659 ata_for_each_sg(sg
, qc
) {
2663 /* determine if physical DMA addr spans 64K boundary.
2664 * Note h/w doesn't support 64-bit, so we unconditionally
2665 * truncate dma_addr_t to u32.
2667 addr
= (u32
) sg_dma_address(sg
);
2668 sg_len
= sg_dma_len(sg
);
2671 offset
= addr
& 0xffff;
2673 if ((offset
+ sg_len
) > 0x10000)
2674 len
= 0x10000 - offset
;
2676 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2677 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2678 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2687 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2690 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2691 * @qc: Metadata associated with taskfile to check
2693 * Allow low-level driver to filter ATA PACKET commands, returning
2694 * a status indicating whether or not it is OK to use DMA for the
2695 * supplied PACKET command.
2698 * spin_lock_irqsave(host_set lock)
2700 * RETURNS: 0 when ATAPI DMA can be used
2703 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2705 struct ata_port
*ap
= qc
->ap
;
2706 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2708 if (ap
->ops
->check_atapi_dma
)
2709 rc
= ap
->ops
->check_atapi_dma(qc
);
2714 * ata_qc_prep - Prepare taskfile for submission
2715 * @qc: Metadata associated with taskfile to be prepared
2717 * Prepare ATA taskfile for submission.
2720 * spin_lock_irqsave(host_set lock)
2722 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2724 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2731 * ata_sg_init_one - Associate command with memory buffer
2732 * @qc: Command to be associated
2733 * @buf: Memory buffer
2734 * @buflen: Length of memory buffer, in bytes.
2736 * Initialize the data-related elements of queued_cmd @qc
2737 * to point to a single memory buffer, @buf of byte length @buflen.
2740 * spin_lock_irqsave(host_set lock)
2743 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2745 struct scatterlist
*sg
;
2747 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2749 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2750 qc
->__sg
= &qc
->sgent
;
2752 qc
->orig_n_elem
= 1;
2756 sg_init_one(sg
, buf
, buflen
);
2760 * ata_sg_init - Associate command with scatter-gather table.
2761 * @qc: Command to be associated
2762 * @sg: Scatter-gather table.
2763 * @n_elem: Number of elements in s/g table.
2765 * Initialize the data-related elements of queued_cmd @qc
2766 * to point to a scatter-gather table @sg, containing @n_elem
2770 * spin_lock_irqsave(host_set lock)
2773 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2774 unsigned int n_elem
)
2776 qc
->flags
|= ATA_QCFLAG_SG
;
2778 qc
->n_elem
= n_elem
;
2779 qc
->orig_n_elem
= n_elem
;
2783 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2784 * @qc: Command with memory buffer to be mapped.
2786 * DMA-map the memory buffer associated with queued_cmd @qc.
2789 * spin_lock_irqsave(host_set lock)
2792 * Zero on success, negative on error.
2795 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2797 struct ata_port
*ap
= qc
->ap
;
2798 int dir
= qc
->dma_dir
;
2799 struct scatterlist
*sg
= qc
->__sg
;
2800 dma_addr_t dma_address
;
2803 /* we must lengthen transfers to end on a 32-bit boundary */
2804 qc
->pad_len
= sg
->length
& 3;
2806 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2807 struct scatterlist
*psg
= &qc
->pad_sgent
;
2809 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2811 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2813 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2814 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2817 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2818 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2820 sg
->length
-= qc
->pad_len
;
2821 if (sg
->length
== 0)
2824 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2825 sg
->length
, qc
->pad_len
);
2833 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2835 if (dma_mapping_error(dma_address
)) {
2837 sg
->length
+= qc
->pad_len
;
2841 sg_dma_address(sg
) = dma_address
;
2842 sg_dma_len(sg
) = sg
->length
;
2845 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2846 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2852 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2853 * @qc: Command with scatter-gather table to be mapped.
2855 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2858 * spin_lock_irqsave(host_set lock)
2861 * Zero on success, negative on error.
2865 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2867 struct ata_port
*ap
= qc
->ap
;
2868 struct scatterlist
*sg
= qc
->__sg
;
2869 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2870 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2872 VPRINTK("ENTER, ata%u\n", ap
->id
);
2873 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
2875 /* we must lengthen transfers to end on a 32-bit boundary */
2876 qc
->pad_len
= lsg
->length
& 3;
2878 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2879 struct scatterlist
*psg
= &qc
->pad_sgent
;
2880 unsigned int offset
;
2882 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2884 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2887 * psg->page/offset are used to copy to-be-written
2888 * data in this function or read data in ata_sg_clean.
2890 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2891 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2892 psg
->offset
= offset_in_page(offset
);
2894 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2895 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2896 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2897 kunmap_atomic(addr
, KM_IRQ0
);
2900 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2901 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2903 lsg
->length
-= qc
->pad_len
;
2904 if (lsg
->length
== 0)
2907 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2908 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2911 pre_n_elem
= qc
->n_elem
;
2912 if (trim_sg
&& pre_n_elem
)
2921 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2923 /* restore last sg */
2924 lsg
->length
+= qc
->pad_len
;
2928 DPRINTK("%d sg elements mapped\n", n_elem
);
2931 qc
->n_elem
= n_elem
;
2937 * ata_poll_qc_complete - turn irq back on and finish qc
2938 * @qc: Command to complete
2939 * @err_mask: ATA status register content
2942 * None. (grabs host lock)
2945 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2947 struct ata_port
*ap
= qc
->ap
;
2948 unsigned long flags
;
2950 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2951 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2953 ata_qc_complete(qc
);
2954 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2958 * ata_pio_poll - poll using PIO, depending on current state
2959 * @ap: the target ata_port
2962 * None. (executing in kernel thread context)
2965 * timeout value to use
2968 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2970 struct ata_queued_cmd
*qc
;
2972 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2973 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2975 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2976 WARN_ON(qc
== NULL
);
2978 switch (ap
->hsm_task_state
) {
2981 poll_state
= HSM_ST_POLL
;
2985 case HSM_ST_LAST_POLL
:
2986 poll_state
= HSM_ST_LAST_POLL
;
2987 reg_state
= HSM_ST_LAST
;
2994 status
= ata_chk_status(ap
);
2995 if (status
& ATA_BUSY
) {
2996 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2997 qc
->err_mask
|= AC_ERR_TIMEOUT
;
2998 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3001 ap
->hsm_task_state
= poll_state
;
3002 return ATA_SHORT_PAUSE
;
3005 ap
->hsm_task_state
= reg_state
;
3010 * ata_pio_complete - check if drive is busy or idle
3011 * @ap: the target ata_port
3014 * None. (executing in kernel thread context)
3017 * Non-zero if qc completed, zero otherwise.
3020 static int ata_pio_complete (struct ata_port
*ap
)
3022 struct ata_queued_cmd
*qc
;
3026 * This is purely heuristic. This is a fast path. Sometimes when
3027 * we enter, BSY will be cleared in a chk-status or two. If not,
3028 * the drive is probably seeking or something. Snooze for a couple
3029 * msecs, then chk-status again. If still busy, fall back to
3030 * HSM_ST_POLL state.
3032 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3033 if (drv_stat
& ATA_BUSY
) {
3035 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3036 if (drv_stat
& ATA_BUSY
) {
3037 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3038 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3043 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3044 WARN_ON(qc
== NULL
);
3046 drv_stat
= ata_wait_idle(ap
);
3047 if (!ata_ok(drv_stat
)) {
3048 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3049 ap
->hsm_task_state
= HSM_ST_ERR
;
3053 ap
->hsm_task_state
= HSM_ST_IDLE
;
3055 WARN_ON(qc
->err_mask
);
3056 ata_poll_qc_complete(qc
);
3058 /* another command may start at this point */
3065 * swap_buf_le16 - swap halves of 16-bit words in place
3066 * @buf: Buffer to swap
3067 * @buf_words: Number of 16-bit words in buffer.
3069 * Swap halves of 16-bit words if needed to convert from
3070 * little-endian byte order to native cpu byte order, or
3074 * Inherited from caller.
3076 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3081 for (i
= 0; i
< buf_words
; i
++)
3082 buf
[i
] = le16_to_cpu(buf
[i
]);
3083 #endif /* __BIG_ENDIAN */
3087 * ata_mmio_data_xfer - Transfer data by MMIO
3088 * @ap: port to read/write
3090 * @buflen: buffer length
3091 * @write_data: read/write
3093 * Transfer data from/to the device data register by MMIO.
3096 * Inherited from caller.
3099 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3100 unsigned int buflen
, int write_data
)
3103 unsigned int words
= buflen
>> 1;
3104 u16
*buf16
= (u16
*) buf
;
3105 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3107 /* Transfer multiple of 2 bytes */
3109 for (i
= 0; i
< words
; i
++)
3110 writew(le16_to_cpu(buf16
[i
]), mmio
);
3112 for (i
= 0; i
< words
; i
++)
3113 buf16
[i
] = cpu_to_le16(readw(mmio
));
3116 /* Transfer trailing 1 byte, if any. */
3117 if (unlikely(buflen
& 0x01)) {
3118 u16 align_buf
[1] = { 0 };
3119 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3122 memcpy(align_buf
, trailing_buf
, 1);
3123 writew(le16_to_cpu(align_buf
[0]), mmio
);
3125 align_buf
[0] = cpu_to_le16(readw(mmio
));
3126 memcpy(trailing_buf
, align_buf
, 1);
3132 * ata_pio_data_xfer - Transfer data by PIO
3133 * @ap: port to read/write
3135 * @buflen: buffer length
3136 * @write_data: read/write
3138 * Transfer data from/to the device data register by PIO.
3141 * Inherited from caller.
3144 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3145 unsigned int buflen
, int write_data
)
3147 unsigned int words
= buflen
>> 1;
3149 /* Transfer multiple of 2 bytes */
3151 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3153 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3155 /* Transfer trailing 1 byte, if any. */
3156 if (unlikely(buflen
& 0x01)) {
3157 u16 align_buf
[1] = { 0 };
3158 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3161 memcpy(align_buf
, trailing_buf
, 1);
3162 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3164 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3165 memcpy(trailing_buf
, align_buf
, 1);
3171 * ata_data_xfer - Transfer data from/to the data register.
3172 * @ap: port to read/write
3174 * @buflen: buffer length
3175 * @do_write: read/write
3177 * Transfer data from/to the device data register.
3180 * Inherited from caller.
3183 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3184 unsigned int buflen
, int do_write
)
3186 /* Make the crap hardware pay the costs not the good stuff */
3187 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3188 unsigned long flags
;
3189 local_irq_save(flags
);
3190 if (ap
->flags
& ATA_FLAG_MMIO
)
3191 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3193 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3194 local_irq_restore(flags
);
3196 if (ap
->flags
& ATA_FLAG_MMIO
)
3197 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3199 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3204 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3205 * @qc: Command on going
3207 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3210 * Inherited from caller.
3213 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3215 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3216 struct scatterlist
*sg
= qc
->__sg
;
3217 struct ata_port
*ap
= qc
->ap
;
3219 unsigned int offset
;
3222 if (qc
->cursect
== (qc
->nsect
- 1))
3223 ap
->hsm_task_state
= HSM_ST_LAST
;
3225 page
= sg
[qc
->cursg
].page
;
3226 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3228 /* get the current page and offset */
3229 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3230 offset
%= PAGE_SIZE
;
3232 buf
= kmap(page
) + offset
;
3237 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3242 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3244 /* do the actual data transfer */
3245 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3246 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3252 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3253 * @qc: Command on going
3254 * @bytes: number of bytes
3256 * Transfer Transfer data from/to the ATAPI device.
3259 * Inherited from caller.
3263 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3265 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3266 struct scatterlist
*sg
= qc
->__sg
;
3267 struct ata_port
*ap
= qc
->ap
;
3270 unsigned int offset
, count
;
3272 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3273 ap
->hsm_task_state
= HSM_ST_LAST
;
3276 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3278 * The end of qc->sg is reached and the device expects
3279 * more data to transfer. In order not to overrun qc->sg
3280 * and fulfill length specified in the byte count register,
3281 * - for read case, discard trailing data from the device
3282 * - for write case, padding zero data to the device
3284 u16 pad_buf
[1] = { 0 };
3285 unsigned int words
= bytes
>> 1;
3288 if (words
) /* warning if bytes > 1 */
3289 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3292 for (i
= 0; i
< words
; i
++)
3293 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3295 ap
->hsm_task_state
= HSM_ST_LAST
;
3299 sg
= &qc
->__sg
[qc
->cursg
];
3302 offset
= sg
->offset
+ qc
->cursg_ofs
;
3304 /* get the current page and offset */
3305 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3306 offset
%= PAGE_SIZE
;
3308 /* don't overrun current sg */
3309 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3311 /* don't cross page boundaries */
3312 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3314 buf
= kmap(page
) + offset
;
3317 qc
->curbytes
+= count
;
3318 qc
->cursg_ofs
+= count
;
3320 if (qc
->cursg_ofs
== sg
->length
) {
3325 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3327 /* do the actual data transfer */
3328 ata_data_xfer(ap
, buf
, count
, do_write
);
3337 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3338 * @qc: Command on going
3340 * Transfer Transfer data from/to the ATAPI device.
3343 * Inherited from caller.
3346 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3348 struct ata_port
*ap
= qc
->ap
;
3349 struct ata_device
*dev
= qc
->dev
;
3350 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3351 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3353 ap
->ops
->tf_read(ap
, &qc
->tf
);
3354 ireason
= qc
->tf
.nsect
;
3355 bc_lo
= qc
->tf
.lbam
;
3356 bc_hi
= qc
->tf
.lbah
;
3357 bytes
= (bc_hi
<< 8) | bc_lo
;
3359 /* shall be cleared to zero, indicating xfer of data */
3360 if (ireason
& (1 << 0))
3363 /* make sure transfer direction matches expected */
3364 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3365 if (do_write
!= i_write
)
3368 __atapi_pio_bytes(qc
, bytes
);
3373 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3374 ap
->id
, dev
->devno
);
3375 qc
->err_mask
|= AC_ERR_HSM
;
3376 ap
->hsm_task_state
= HSM_ST_ERR
;
3380 * ata_pio_block - start PIO on a block
3381 * @ap: the target ata_port
3384 * None. (executing in kernel thread context)
3387 static void ata_pio_block(struct ata_port
*ap
)
3389 struct ata_queued_cmd
*qc
;
3393 * This is purely heuristic. This is a fast path.
3394 * Sometimes when we enter, BSY will be cleared in
3395 * a chk-status or two. If not, the drive is probably seeking
3396 * or something. Snooze for a couple msecs, then
3397 * chk-status again. If still busy, fall back to
3398 * HSM_ST_POLL state.
3400 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3401 if (status
& ATA_BUSY
) {
3403 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3404 if (status
& ATA_BUSY
) {
3405 ap
->hsm_task_state
= HSM_ST_POLL
;
3406 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3411 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3412 WARN_ON(qc
== NULL
);
3415 if (status
& (ATA_ERR
| ATA_DF
)) {
3416 qc
->err_mask
|= AC_ERR_DEV
;
3417 ap
->hsm_task_state
= HSM_ST_ERR
;
3421 /* transfer data if any */
3422 if (is_atapi_taskfile(&qc
->tf
)) {
3423 /* DRQ=0 means no more data to transfer */
3424 if ((status
& ATA_DRQ
) == 0) {
3425 ap
->hsm_task_state
= HSM_ST_LAST
;
3429 atapi_pio_bytes(qc
);
3431 /* handle BSY=0, DRQ=0 as error */
3432 if ((status
& ATA_DRQ
) == 0) {
3433 qc
->err_mask
|= AC_ERR_HSM
;
3434 ap
->hsm_task_state
= HSM_ST_ERR
;
3442 static void ata_pio_error(struct ata_port
*ap
)
3444 struct ata_queued_cmd
*qc
;
3446 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3447 WARN_ON(qc
== NULL
);
3449 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3450 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3452 /* make sure qc->err_mask is available to
3453 * know what's wrong and recover
3455 WARN_ON(qc
->err_mask
== 0);
3457 ap
->hsm_task_state
= HSM_ST_IDLE
;
3459 ata_poll_qc_complete(qc
);
3462 static void ata_pio_task(void *_data
)
3464 struct ata_port
*ap
= _data
;
3465 unsigned long timeout
;
3472 switch (ap
->hsm_task_state
) {
3481 qc_completed
= ata_pio_complete(ap
);
3485 case HSM_ST_LAST_POLL
:
3486 timeout
= ata_pio_poll(ap
);
3496 ata_queue_delayed_pio_task(ap
, timeout
);
3497 else if (!qc_completed
)
3502 * ata_qc_timeout - Handle timeout of queued command
3503 * @qc: Command that timed out
3505 * Some part of the kernel (currently, only the SCSI layer)
3506 * has noticed that the active command on port @ap has not
3507 * completed after a specified length of time. Handle this
3508 * condition by disabling DMA (if necessary) and completing
3509 * transactions, with error if necessary.
3511 * This also handles the case of the "lost interrupt", where
3512 * for some reason (possibly hardware bug, possibly driver bug)
3513 * an interrupt was not delivered to the driver, even though the
3514 * transaction completed successfully.
3517 * Inherited from SCSI layer (none, can sleep)
3520 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3522 struct ata_port
*ap
= qc
->ap
;
3523 struct ata_host_set
*host_set
= ap
->host_set
;
3524 u8 host_stat
= 0, drv_stat
;
3525 unsigned long flags
;
3529 ata_flush_pio_tasks(ap
);
3530 ap
->hsm_task_state
= HSM_ST_IDLE
;
3532 spin_lock_irqsave(&host_set
->lock
, flags
);
3534 switch (qc
->tf
.protocol
) {
3537 case ATA_PROT_ATAPI_DMA
:
3538 host_stat
= ap
->ops
->bmdma_status(ap
);
3540 /* before we do anything else, clear DMA-Start bit */
3541 ap
->ops
->bmdma_stop(qc
);
3547 drv_stat
= ata_chk_status(ap
);
3549 /* ack bmdma irq events */
3550 ap
->ops
->irq_clear(ap
);
3552 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3553 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3555 /* complete taskfile transaction */
3556 qc
->err_mask
|= ac_err_mask(drv_stat
);
3560 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3562 ata_eh_qc_complete(qc
);
3568 * ata_eng_timeout - Handle timeout of queued command
3569 * @ap: Port on which timed-out command is active
3571 * Some part of the kernel (currently, only the SCSI layer)
3572 * has noticed that the active command on port @ap has not
3573 * completed after a specified length of time. Handle this
3574 * condition by disabling DMA (if necessary) and completing
3575 * transactions, with error if necessary.
3577 * This also handles the case of the "lost interrupt", where
3578 * for some reason (possibly hardware bug, possibly driver bug)
3579 * an interrupt was not delivered to the driver, even though the
3580 * transaction completed successfully.
3583 * Inherited from SCSI layer (none, can sleep)
3586 void ata_eng_timeout(struct ata_port
*ap
)
3590 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3596 * ata_qc_new - Request an available ATA command, for queueing
3597 * @ap: Port associated with device @dev
3598 * @dev: Device from whom we request an available command structure
3604 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3606 struct ata_queued_cmd
*qc
= NULL
;
3609 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3610 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3611 qc
= ata_qc_from_tag(ap
, i
);
3622 * ata_qc_new_init - Request an available ATA command, and initialize it
3623 * @ap: Port associated with device @dev
3624 * @dev: Device from whom we request an available command structure
3630 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3631 struct ata_device
*dev
)
3633 struct ata_queued_cmd
*qc
;
3635 qc
= ata_qc_new(ap
);
3648 * ata_qc_free - free unused ata_queued_cmd
3649 * @qc: Command to complete
3651 * Designed to free unused ata_queued_cmd object
3652 * in case something prevents using it.
3655 * spin_lock_irqsave(host_set lock)
3657 void ata_qc_free(struct ata_queued_cmd
*qc
)
3659 struct ata_port
*ap
= qc
->ap
;
3662 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3666 if (likely(ata_tag_valid(tag
))) {
3667 if (tag
== ap
->active_tag
)
3668 ap
->active_tag
= ATA_TAG_POISON
;
3669 qc
->tag
= ATA_TAG_POISON
;
3670 clear_bit(tag
, &ap
->qactive
);
3674 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3676 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3677 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3679 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3682 /* atapi: mark qc as inactive to prevent the interrupt handler
3683 * from completing the command twice later, before the error handler
3684 * is called. (when rc != 0 and atapi request sense is needed)
3686 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3688 /* call completion callback */
3689 qc
->complete_fn(qc
);
3692 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3694 struct ata_port
*ap
= qc
->ap
;
3696 switch (qc
->tf
.protocol
) {
3698 case ATA_PROT_ATAPI_DMA
:
3701 case ATA_PROT_ATAPI
:
3703 case ATA_PROT_PIO_MULT
:
3704 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3717 * ata_qc_issue - issue taskfile to device
3718 * @qc: command to issue to device
3720 * Prepare an ATA command to submission to device.
3721 * This includes mapping the data into a DMA-able
3722 * area, filling in the S/G table, and finally
3723 * writing the taskfile to hardware, starting the command.
3726 * spin_lock_irqsave(host_set lock)
3729 * Zero on success, AC_ERR_* mask on failure
3732 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3734 struct ata_port
*ap
= qc
->ap
;
3736 if (ata_should_dma_map(qc
)) {
3737 if (qc
->flags
& ATA_QCFLAG_SG
) {
3738 if (ata_sg_setup(qc
))
3740 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3741 if (ata_sg_setup_one(qc
))
3745 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3748 ap
->ops
->qc_prep(qc
);
3750 qc
->ap
->active_tag
= qc
->tag
;
3751 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3753 return ap
->ops
->qc_issue(qc
);
3756 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3757 return AC_ERR_SYSTEM
;
3762 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3763 * @qc: command to issue to device
3765 * Using various libata functions and hooks, this function
3766 * starts an ATA command. ATA commands are grouped into
3767 * classes called "protocols", and issuing each type of protocol
3768 * is slightly different.
3770 * May be used as the qc_issue() entry in ata_port_operations.
3773 * spin_lock_irqsave(host_set lock)
3776 * Zero on success, AC_ERR_* mask on failure
3779 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3781 struct ata_port
*ap
= qc
->ap
;
3783 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3785 switch (qc
->tf
.protocol
) {
3786 case ATA_PROT_NODATA
:
3787 ata_tf_to_host(ap
, &qc
->tf
);
3791 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3792 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3793 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3796 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3797 ata_qc_set_polling(qc
);
3798 ata_tf_to_host(ap
, &qc
->tf
);
3799 ap
->hsm_task_state
= HSM_ST
;
3800 ata_queue_pio_task(ap
);
3803 case ATA_PROT_ATAPI
:
3804 ata_qc_set_polling(qc
);
3805 ata_tf_to_host(ap
, &qc
->tf
);
3806 ata_queue_packet_task(ap
);
3809 case ATA_PROT_ATAPI_NODATA
:
3810 ap
->flags
|= ATA_FLAG_NOINTR
;
3811 ata_tf_to_host(ap
, &qc
->tf
);
3812 ata_queue_packet_task(ap
);
3815 case ATA_PROT_ATAPI_DMA
:
3816 ap
->flags
|= ATA_FLAG_NOINTR
;
3817 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3818 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3819 ata_queue_packet_task(ap
);
3824 return AC_ERR_SYSTEM
;
3831 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3832 * @qc: Info associated with this ATA transaction.
3835 * spin_lock_irqsave(host_set lock)
3838 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3840 struct ata_port
*ap
= qc
->ap
;
3841 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3843 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3845 /* load PRD table addr. */
3846 mb(); /* make sure PRD table writes are visible to controller */
3847 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3849 /* specify data direction, triple-check start bit is clear */
3850 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3851 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3853 dmactl
|= ATA_DMA_WR
;
3854 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3856 /* issue r/w command */
3857 ap
->ops
->exec_command(ap
, &qc
->tf
);
3861 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3862 * @qc: Info associated with this ATA transaction.
3865 * spin_lock_irqsave(host_set lock)
3868 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3870 struct ata_port
*ap
= qc
->ap
;
3871 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3874 /* start host DMA transaction */
3875 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3876 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3878 /* Strictly, one may wish to issue a readb() here, to
3879 * flush the mmio write. However, control also passes
3880 * to the hardware at this point, and it will interrupt
3881 * us when we are to resume control. So, in effect,
3882 * we don't care when the mmio write flushes.
3883 * Further, a read of the DMA status register _immediately_
3884 * following the write may not be what certain flaky hardware
3885 * is expected, so I think it is best to not add a readb()
3886 * without first all the MMIO ATA cards/mobos.
3887 * Or maybe I'm just being paranoid.
3892 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3893 * @qc: Info associated with this ATA transaction.
3896 * spin_lock_irqsave(host_set lock)
3899 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3901 struct ata_port
*ap
= qc
->ap
;
3902 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3905 /* load PRD table addr. */
3906 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3908 /* specify data direction, triple-check start bit is clear */
3909 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3910 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3912 dmactl
|= ATA_DMA_WR
;
3913 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3915 /* issue r/w command */
3916 ap
->ops
->exec_command(ap
, &qc
->tf
);
3920 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3921 * @qc: Info associated with this ATA transaction.
3924 * spin_lock_irqsave(host_set lock)
3927 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3929 struct ata_port
*ap
= qc
->ap
;
3932 /* start host DMA transaction */
3933 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3934 outb(dmactl
| ATA_DMA_START
,
3935 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3940 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3941 * @qc: Info associated with this ATA transaction.
3943 * Writes the ATA_DMA_START flag to the DMA command register.
3945 * May be used as the bmdma_start() entry in ata_port_operations.
3948 * spin_lock_irqsave(host_set lock)
3950 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3952 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3953 ata_bmdma_start_mmio(qc
);
3955 ata_bmdma_start_pio(qc
);
3960 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3961 * @qc: Info associated with this ATA transaction.
3963 * Writes address of PRD table to device's PRD Table Address
3964 * register, sets the DMA control register, and calls
3965 * ops->exec_command() to start the transfer.
3967 * May be used as the bmdma_setup() entry in ata_port_operations.
3970 * spin_lock_irqsave(host_set lock)
3972 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3974 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3975 ata_bmdma_setup_mmio(qc
);
3977 ata_bmdma_setup_pio(qc
);
3982 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3983 * @ap: Port associated with this ATA transaction.
3985 * Clear interrupt and error flags in DMA status register.
3987 * May be used as the irq_clear() entry in ata_port_operations.
3990 * spin_lock_irqsave(host_set lock)
3993 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3995 if (ap
->flags
& ATA_FLAG_MMIO
) {
3996 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3997 writeb(readb(mmio
), mmio
);
3999 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4000 outb(inb(addr
), addr
);
4007 * ata_bmdma_status - Read PCI IDE BMDMA status
4008 * @ap: Port associated with this ATA transaction.
4010 * Read and return BMDMA status register.
4012 * May be used as the bmdma_status() entry in ata_port_operations.
4015 * spin_lock_irqsave(host_set lock)
4018 u8
ata_bmdma_status(struct ata_port
*ap
)
4021 if (ap
->flags
& ATA_FLAG_MMIO
) {
4022 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4023 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4025 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4031 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4032 * @qc: Command we are ending DMA for
4034 * Clears the ATA_DMA_START flag in the dma control register
4036 * May be used as the bmdma_stop() entry in ata_port_operations.
4039 * spin_lock_irqsave(host_set lock)
4042 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4044 struct ata_port
*ap
= qc
->ap
;
4045 if (ap
->flags
& ATA_FLAG_MMIO
) {
4046 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4048 /* clear start/stop bit */
4049 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4050 mmio
+ ATA_DMA_CMD
);
4052 /* clear start/stop bit */
4053 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4054 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4057 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4058 ata_altstatus(ap
); /* dummy read */
4062 * ata_host_intr - Handle host interrupt for given (port, task)
4063 * @ap: Port on which interrupt arrived (possibly...)
4064 * @qc: Taskfile currently active in engine
4066 * Handle host interrupt for given queued command. Currently,
4067 * only DMA interrupts are handled. All other commands are
4068 * handled via polling with interrupts disabled (nIEN bit).
4071 * spin_lock_irqsave(host_set lock)
4074 * One if interrupt was handled, zero if not (shared irq).
4077 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4078 struct ata_queued_cmd
*qc
)
4080 u8 status
, host_stat
;
4082 switch (qc
->tf
.protocol
) {
4085 case ATA_PROT_ATAPI_DMA
:
4086 case ATA_PROT_ATAPI
:
4087 /* check status of DMA engine */
4088 host_stat
= ap
->ops
->bmdma_status(ap
);
4089 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4091 /* if it's not our irq... */
4092 if (!(host_stat
& ATA_DMA_INTR
))
4095 /* before we do anything else, clear DMA-Start bit */
4096 ap
->ops
->bmdma_stop(qc
);
4100 case ATA_PROT_ATAPI_NODATA
:
4101 case ATA_PROT_NODATA
:
4102 /* check altstatus */
4103 status
= ata_altstatus(ap
);
4104 if (status
& ATA_BUSY
)
4107 /* check main status, clearing INTRQ */
4108 status
= ata_chk_status(ap
);
4109 if (unlikely(status
& ATA_BUSY
))
4111 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4112 ap
->id
, qc
->tf
.protocol
, status
);
4114 /* ack bmdma irq events */
4115 ap
->ops
->irq_clear(ap
);
4117 /* complete taskfile transaction */
4118 qc
->err_mask
|= ac_err_mask(status
);
4119 ata_qc_complete(qc
);
4126 return 1; /* irq handled */
4129 ap
->stats
.idle_irq
++;
4132 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4134 ata_irq_ack(ap
, 0); /* debug trap */
4135 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4138 return 0; /* irq not handled */
4142 * ata_interrupt - Default ATA host interrupt handler
4143 * @irq: irq line (unused)
4144 * @dev_instance: pointer to our ata_host_set information structure
4147 * Default interrupt handler for PCI IDE devices. Calls
4148 * ata_host_intr() for each port that is not disabled.
4151 * Obtains host_set lock during operation.
4154 * IRQ_NONE or IRQ_HANDLED.
4157 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4159 struct ata_host_set
*host_set
= dev_instance
;
4161 unsigned int handled
= 0;
4162 unsigned long flags
;
4164 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4165 spin_lock_irqsave(&host_set
->lock
, flags
);
4167 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4168 struct ata_port
*ap
;
4170 ap
= host_set
->ports
[i
];
4172 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4173 struct ata_queued_cmd
*qc
;
4175 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4176 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4177 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4178 handled
|= ata_host_intr(ap
, qc
);
4182 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4184 return IRQ_RETVAL(handled
);
4188 * atapi_packet_task - Write CDB bytes to hardware
4189 * @_data: Port to which ATAPI device is attached.
4191 * When device has indicated its readiness to accept
4192 * a CDB, this function is called. Send the CDB.
4193 * If DMA is to be performed, exit immediately.
4194 * Otherwise, we are in polling mode, so poll
4195 * status under operation succeeds or fails.
4198 * Kernel thread context (may sleep)
4201 static void atapi_packet_task(void *_data
)
4203 struct ata_port
*ap
= _data
;
4204 struct ata_queued_cmd
*qc
;
4207 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4208 WARN_ON(qc
== NULL
);
4209 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4211 /* sleep-wait for BSY to clear */
4212 DPRINTK("busy wait\n");
4213 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4214 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4218 /* make sure DRQ is set */
4219 status
= ata_chk_status(ap
);
4220 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4221 qc
->err_mask
|= AC_ERR_HSM
;
4226 DPRINTK("send cdb\n");
4227 WARN_ON(qc
->dev
->cdb_len
< 12);
4229 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4230 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4231 unsigned long flags
;
4233 /* Once we're done issuing command and kicking bmdma,
4234 * irq handler takes over. To not lose irq, we need
4235 * to clear NOINTR flag before sending cdb, but
4236 * interrupt handler shouldn't be invoked before we're
4237 * finished. Hence, the following locking.
4239 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4240 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4241 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4242 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4243 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4244 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4246 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4248 /* PIO commands are handled by polling */
4249 ap
->hsm_task_state
= HSM_ST
;
4250 ata_queue_pio_task(ap
);
4256 ata_poll_qc_complete(qc
);
4261 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4262 * without filling any other registers
4264 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4267 struct ata_taskfile tf
;
4270 ata_tf_init(ap
, &tf
, dev
->devno
);
4273 tf
.flags
|= ATA_TFLAG_DEVICE
;
4274 tf
.protocol
= ATA_PROT_NODATA
;
4276 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4278 printk(KERN_ERR
"%s: ata command failed: %d\n",
4284 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4288 if (!ata_try_flush_cache(dev
))
4291 if (ata_id_has_flush_ext(dev
->id
))
4292 cmd
= ATA_CMD_FLUSH_EXT
;
4294 cmd
= ATA_CMD_FLUSH
;
4296 return ata_do_simple_cmd(ap
, dev
, cmd
);
4299 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4301 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4304 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4306 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4310 * ata_device_resume - wakeup a previously suspended devices
4311 * @ap: port the device is connected to
4312 * @dev: the device to resume
4314 * Kick the drive back into action, by sending it an idle immediate
4315 * command and making sure its transfer mode matches between drive
4319 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4321 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4322 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4325 if (!ata_dev_present(dev
))
4327 if (dev
->class == ATA_DEV_ATA
)
4328 ata_start_drive(ap
, dev
);
4334 * ata_device_suspend - prepare a device for suspend
4335 * @ap: port the device is connected to
4336 * @dev: the device to suspend
4338 * Flush the cache on the drive, if appropriate, then issue a
4339 * standbynow command.
4341 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4343 if (!ata_dev_present(dev
))
4345 if (dev
->class == ATA_DEV_ATA
)
4346 ata_flush_cache(ap
, dev
);
4348 ata_standby_drive(ap
, dev
);
4349 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4354 * ata_port_start - Set port up for dma.
4355 * @ap: Port to initialize
4357 * Called just after data structures for each port are
4358 * initialized. Allocates space for PRD table.
4360 * May be used as the port_start() entry in ata_port_operations.
4363 * Inherited from caller.
4366 int ata_port_start (struct ata_port
*ap
)
4368 struct device
*dev
= ap
->host_set
->dev
;
4371 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4375 rc
= ata_pad_alloc(ap
, dev
);
4377 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4381 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4388 * ata_port_stop - Undo ata_port_start()
4389 * @ap: Port to shut down
4391 * Frees the PRD table.
4393 * May be used as the port_stop() entry in ata_port_operations.
4396 * Inherited from caller.
4399 void ata_port_stop (struct ata_port
*ap
)
4401 struct device
*dev
= ap
->host_set
->dev
;
4403 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4404 ata_pad_free(ap
, dev
);
4407 void ata_host_stop (struct ata_host_set
*host_set
)
4409 if (host_set
->mmio_base
)
4410 iounmap(host_set
->mmio_base
);
4415 * ata_host_remove - Unregister SCSI host structure with upper layers
4416 * @ap: Port to unregister
4417 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4420 * Inherited from caller.
4423 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4425 struct Scsi_Host
*sh
= ap
->host
;
4430 scsi_remove_host(sh
);
4432 ap
->ops
->port_stop(ap
);
4436 * ata_host_init - Initialize an ata_port structure
4437 * @ap: Structure to initialize
4438 * @host: associated SCSI mid-layer structure
4439 * @host_set: Collection of hosts to which @ap belongs
4440 * @ent: Probe information provided by low-level driver
4441 * @port_no: Port number associated with this ata_port
4443 * Initialize a new ata_port structure, and its associated
4447 * Inherited from caller.
4450 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4451 struct ata_host_set
*host_set
,
4452 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4458 host
->max_channel
= 1;
4459 host
->unique_id
= ata_unique_id
++;
4460 host
->max_cmd_len
= 12;
4462 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4463 ap
->id
= host
->unique_id
;
4465 ap
->ctl
= ATA_DEVCTL_OBS
;
4466 ap
->host_set
= host_set
;
4467 ap
->port_no
= port_no
;
4469 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4470 ap
->pio_mask
= ent
->pio_mask
;
4471 ap
->mwdma_mask
= ent
->mwdma_mask
;
4472 ap
->udma_mask
= ent
->udma_mask
;
4473 ap
->flags
|= ent
->host_flags
;
4474 ap
->ops
= ent
->port_ops
;
4475 ap
->cbl
= ATA_CBL_NONE
;
4476 ap
->active_tag
= ATA_TAG_POISON
;
4477 ap
->last_ctl
= 0xFF;
4479 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4480 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4481 INIT_LIST_HEAD(&ap
->eh_done_q
);
4483 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4484 ap
->device
[i
].devno
= i
;
4487 ap
->stats
.unhandled_irq
= 1;
4488 ap
->stats
.idle_irq
= 1;
4491 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4495 * ata_host_add - Attach low-level ATA driver to system
4496 * @ent: Information provided by low-level driver
4497 * @host_set: Collections of ports to which we add
4498 * @port_no: Port number associated with this host
4500 * Attach low-level ATA driver to system.
4503 * PCI/etc. bus probe sem.
4506 * New ata_port on success, for NULL on error.
4509 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4510 struct ata_host_set
*host_set
,
4511 unsigned int port_no
)
4513 struct Scsi_Host
*host
;
4514 struct ata_port
*ap
;
4518 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4522 ap
= (struct ata_port
*) &host
->hostdata
[0];
4524 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4526 rc
= ap
->ops
->port_start(ap
);
4533 scsi_host_put(host
);
4538 * ata_device_add - Register hardware device with ATA and SCSI layers
4539 * @ent: Probe information describing hardware device to be registered
4541 * This function processes the information provided in the probe
4542 * information struct @ent, allocates the necessary ATA and SCSI
4543 * host information structures, initializes them, and registers
4544 * everything with requisite kernel subsystems.
4546 * This function requests irqs, probes the ATA bus, and probes
4550 * PCI/etc. bus probe sem.
4553 * Number of ports registered. Zero on error (no ports registered).
4556 int ata_device_add(const struct ata_probe_ent
*ent
)
4558 unsigned int count
= 0, i
;
4559 struct device
*dev
= ent
->dev
;
4560 struct ata_host_set
*host_set
;
4563 /* alloc a container for our list of ATA ports (buses) */
4564 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4565 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4568 spin_lock_init(&host_set
->lock
);
4570 host_set
->dev
= dev
;
4571 host_set
->n_ports
= ent
->n_ports
;
4572 host_set
->irq
= ent
->irq
;
4573 host_set
->mmio_base
= ent
->mmio_base
;
4574 host_set
->private_data
= ent
->private_data
;
4575 host_set
->ops
= ent
->port_ops
;
4577 /* register each port bound to this device */
4578 for (i
= 0; i
< ent
->n_ports
; i
++) {
4579 struct ata_port
*ap
;
4580 unsigned long xfer_mode_mask
;
4582 ap
= ata_host_add(ent
, host_set
, i
);
4586 host_set
->ports
[i
] = ap
;
4587 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4588 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4589 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4591 /* print per-port info to dmesg */
4592 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4593 "bmdma 0x%lX irq %lu\n",
4595 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4596 ata_mode_string(xfer_mode_mask
),
4597 ap
->ioaddr
.cmd_addr
,
4598 ap
->ioaddr
.ctl_addr
,
4599 ap
->ioaddr
.bmdma_addr
,
4603 host_set
->ops
->irq_clear(ap
);
4610 /* obtain irq, that is shared between channels */
4611 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4612 DRV_NAME
, host_set
))
4615 /* perform each probe synchronously */
4616 DPRINTK("probe begin\n");
4617 for (i
= 0; i
< count
; i
++) {
4618 struct ata_port
*ap
;
4621 ap
= host_set
->ports
[i
];
4623 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4624 rc
= ata_bus_probe(ap
);
4625 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4628 /* FIXME: do something useful here?
4629 * Current libata behavior will
4630 * tear down everything when
4631 * the module is removed
4632 * or the h/w is unplugged.
4636 rc
= scsi_add_host(ap
->host
, dev
);
4638 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4640 /* FIXME: do something useful here */
4641 /* FIXME: handle unconditional calls to
4642 * scsi_scan_host and ata_host_remove, below,
4648 /* probes are done, now scan each port's disk(s) */
4649 DPRINTK("host probe begin\n");
4650 for (i
= 0; i
< count
; i
++) {
4651 struct ata_port
*ap
= host_set
->ports
[i
];
4653 ata_scsi_scan_host(ap
);
4656 dev_set_drvdata(dev
, host_set
);
4658 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4659 return ent
->n_ports
; /* success */
4662 for (i
= 0; i
< count
; i
++) {
4663 ata_host_remove(host_set
->ports
[i
], 1);
4664 scsi_host_put(host_set
->ports
[i
]->host
);
4668 VPRINTK("EXIT, returning 0\n");
4673 * ata_host_set_remove - PCI layer callback for device removal
4674 * @host_set: ATA host set that was removed
4676 * Unregister all objects associated with this host set. Free those
4680 * Inherited from calling layer (may sleep).
4683 void ata_host_set_remove(struct ata_host_set
*host_set
)
4685 struct ata_port
*ap
;
4688 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4689 ap
= host_set
->ports
[i
];
4690 scsi_remove_host(ap
->host
);
4693 free_irq(host_set
->irq
, host_set
);
4695 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4696 ap
= host_set
->ports
[i
];
4698 ata_scsi_release(ap
->host
);
4700 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4701 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4703 if (ioaddr
->cmd_addr
== 0x1f0)
4704 release_region(0x1f0, 8);
4705 else if (ioaddr
->cmd_addr
== 0x170)
4706 release_region(0x170, 8);
4709 scsi_host_put(ap
->host
);
4712 if (host_set
->ops
->host_stop
)
4713 host_set
->ops
->host_stop(host_set
);
4719 * ata_scsi_release - SCSI layer callback hook for host unload
4720 * @host: libata host to be unloaded
4722 * Performs all duties necessary to shut down a libata port...
4723 * Kill port kthread, disable port, and release resources.
4726 * Inherited from SCSI layer.
4732 int ata_scsi_release(struct Scsi_Host
*host
)
4734 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4738 ap
->ops
->port_disable(ap
);
4739 ata_host_remove(ap
, 0);
4746 * ata_std_ports - initialize ioaddr with standard port offsets.
4747 * @ioaddr: IO address structure to be initialized
4749 * Utility function which initializes data_addr, error_addr,
4750 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4751 * device_addr, status_addr, and command_addr to standard offsets
4752 * relative to cmd_addr.
4754 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4757 void ata_std_ports(struct ata_ioports
*ioaddr
)
4759 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4760 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4761 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4762 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4763 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4764 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4765 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4766 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4767 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4768 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4774 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4776 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4778 pci_iounmap(pdev
, host_set
->mmio_base
);
4782 * ata_pci_remove_one - PCI layer callback for device removal
4783 * @pdev: PCI device that was removed
4785 * PCI layer indicates to libata via this hook that
4786 * hot-unplug or module unload event has occurred.
4787 * Handle this by unregistering all objects associated
4788 * with this PCI device. Free those objects. Then finally
4789 * release PCI resources and disable device.
4792 * Inherited from PCI layer (may sleep).
4795 void ata_pci_remove_one (struct pci_dev
*pdev
)
4797 struct device
*dev
= pci_dev_to_dev(pdev
);
4798 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4800 ata_host_set_remove(host_set
);
4801 pci_release_regions(pdev
);
4802 pci_disable_device(pdev
);
4803 dev_set_drvdata(dev
, NULL
);
4806 /* move to PCI subsystem */
4807 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4809 unsigned long tmp
= 0;
4811 switch (bits
->width
) {
4814 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4820 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4826 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4837 return (tmp
== bits
->val
) ? 1 : 0;
4840 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4842 pci_save_state(pdev
);
4843 pci_disable_device(pdev
);
4844 pci_set_power_state(pdev
, PCI_D3hot
);
4848 int ata_pci_device_resume(struct pci_dev
*pdev
)
4850 pci_set_power_state(pdev
, PCI_D0
);
4851 pci_restore_state(pdev
);
4852 pci_enable_device(pdev
);
4853 pci_set_master(pdev
);
4856 #endif /* CONFIG_PCI */
4859 static int __init
ata_init(void)
4861 ata_wq
= create_workqueue("ata");
4865 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4869 static void __exit
ata_exit(void)
4871 destroy_workqueue(ata_wq
);
4874 module_init(ata_init
);
4875 module_exit(ata_exit
);
4877 static unsigned long ratelimit_time
;
4878 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4880 int ata_ratelimit(void)
4883 unsigned long flags
;
4885 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4887 if (time_after(jiffies
, ratelimit_time
)) {
4889 ratelimit_time
= jiffies
+ (HZ
/5);
4893 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4899 * libata is essentially a library of internal helper functions for
4900 * low-level ATA host controller drivers. As such, the API/ABI is
4901 * likely to change as new drivers are added and updated.
4902 * Do not depend on ABI/API stability.
4905 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4906 EXPORT_SYMBOL_GPL(ata_std_ports
);
4907 EXPORT_SYMBOL_GPL(ata_device_add
);
4908 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4909 EXPORT_SYMBOL_GPL(ata_sg_init
);
4910 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4911 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
4912 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4913 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4914 EXPORT_SYMBOL_GPL(ata_tf_load
);
4915 EXPORT_SYMBOL_GPL(ata_tf_read
);
4916 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4917 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4918 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4919 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4920 EXPORT_SYMBOL_GPL(ata_check_status
);
4921 EXPORT_SYMBOL_GPL(ata_altstatus
);
4922 EXPORT_SYMBOL_GPL(ata_exec_command
);
4923 EXPORT_SYMBOL_GPL(ata_port_start
);
4924 EXPORT_SYMBOL_GPL(ata_port_stop
);
4925 EXPORT_SYMBOL_GPL(ata_host_stop
);
4926 EXPORT_SYMBOL_GPL(ata_interrupt
);
4927 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4928 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4929 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4930 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4931 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4932 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4933 EXPORT_SYMBOL_GPL(ata_port_probe
);
4934 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4935 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4936 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4937 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
4938 EXPORT_SYMBOL_GPL(ata_std_softreset
);
4939 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
4940 EXPORT_SYMBOL_GPL(ata_std_postreset
);
4941 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
4942 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
4943 EXPORT_SYMBOL_GPL(ata_port_disable
);
4944 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4945 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
4946 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4947 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4948 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
4949 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4950 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4951 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4952 EXPORT_SYMBOL_GPL(ata_host_intr
);
4953 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4954 EXPORT_SYMBOL_GPL(ata_id_string
);
4955 EXPORT_SYMBOL_GPL(ata_id_c_string
);
4956 EXPORT_SYMBOL_GPL(ata_dev_config
);
4957 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4958 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
4959 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
4961 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
4962 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4963 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4966 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4967 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4968 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4969 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4970 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4971 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
4972 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
4973 #endif /* CONFIG_PCI */
4975 EXPORT_SYMBOL_GPL(ata_device_suspend
);
4976 EXPORT_SYMBOL_GPL(ata_device_resume
);
4977 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
4978 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);