2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
);
65 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
);
69 static int fgb(u32 bitmap
);
70 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
72 unsigned int *xfer_shift_out
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 int atapi_enabled
= 0;
78 module_param(atapi_enabled
, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION
);
88 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
97 * Inherited from caller.
100 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
102 fis
[0] = 0x27; /* Register - Host to Device FIS */
103 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis
[2] = tf
->command
;
106 fis
[3] = tf
->feature
;
113 fis
[8] = tf
->hob_lbal
;
114 fis
[9] = tf
->hob_lbam
;
115 fis
[10] = tf
->hob_lbah
;
116 fis
[11] = tf
->hob_feature
;
119 fis
[13] = tf
->hob_nsect
;
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
137 * Inherited from caller.
140 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
142 tf
->command
= fis
[2]; /* status */
143 tf
->feature
= fis
[3]; /* error */
150 tf
->hob_lbal
= fis
[8];
151 tf
->hob_lbam
= fis
[9];
152 tf
->hob_lbah
= fis
[10];
155 tf
->hob_nsect
= fis
[13];
158 static const u8 ata_rw_cmds
[] = {
162 ATA_CMD_READ_MULTI_EXT
,
163 ATA_CMD_WRITE_MULTI_EXT
,
167 ATA_CMD_WRITE_MULTI_FUA_EXT
,
171 ATA_CMD_PIO_READ_EXT
,
172 ATA_CMD_PIO_WRITE_EXT
,
185 ATA_CMD_WRITE_FUA_EXT
189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
198 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
200 struct ata_taskfile
*tf
= &qc
->tf
;
201 struct ata_device
*dev
= qc
->dev
;
204 int index
, fua
, lba48
, write
;
206 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
207 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
208 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
210 if (dev
->flags
& ATA_DFLAG_PIO
) {
211 tf
->protocol
= ATA_PROT_PIO
;
212 index
= dev
->multi_count
? 0 : 8;
213 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
214 /* Unable to use DMA due to host limitation */
215 tf
->protocol
= ATA_PROT_PIO
;
216 index
= dev
->multi_count
? 0 : 8;
218 tf
->protocol
= ATA_PROT_DMA
;
222 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
230 static const char * const xfer_mode_str
[] = {
250 * ata_udma_string - convert UDMA bit offset to string
251 * @mask: mask of bits supported; only highest bit counts.
253 * Determine string which represents the highest speed
254 * (highest bit in @udma_mask).
260 * Constant C string representing highest speed listed in
261 * @udma_mask, or the constant C string "<n/a>".
264 static const char *ata_mode_string(unsigned int mask
)
268 for (i
= 7; i
>= 0; i
--)
271 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
274 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
281 return xfer_mode_str
[i
];
285 * ata_pio_devchk - PATA device presence detection
286 * @ap: ATA channel to examine
287 * @device: Device to examine (starting at zero)
289 * This technique was originally described in
290 * Hale Landis's ATADRVR (www.ata-atapi.com), and
291 * later found its way into the ATA/ATAPI spec.
293 * Write a pattern to the ATA shadow registers,
294 * and if a device is present, it will respond by
295 * correctly storing and echoing back the
296 * ATA shadow register contents.
302 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
305 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
308 ap
->ops
->dev_select(ap
, device
);
310 outb(0x55, ioaddr
->nsect_addr
);
311 outb(0xaa, ioaddr
->lbal_addr
);
313 outb(0xaa, ioaddr
->nsect_addr
);
314 outb(0x55, ioaddr
->lbal_addr
);
316 outb(0x55, ioaddr
->nsect_addr
);
317 outb(0xaa, ioaddr
->lbal_addr
);
319 nsect
= inb(ioaddr
->nsect_addr
);
320 lbal
= inb(ioaddr
->lbal_addr
);
322 if ((nsect
== 0x55) && (lbal
== 0xaa))
323 return 1; /* we found a device */
325 return 0; /* nothing found */
329 * ata_mmio_devchk - PATA device presence detection
330 * @ap: ATA channel to examine
331 * @device: Device to examine (starting at zero)
333 * This technique was originally described in
334 * Hale Landis's ATADRVR (www.ata-atapi.com), and
335 * later found its way into the ATA/ATAPI spec.
337 * Write a pattern to the ATA shadow registers,
338 * and if a device is present, it will respond by
339 * correctly storing and echoing back the
340 * ATA shadow register contents.
346 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
349 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
352 ap
->ops
->dev_select(ap
, device
);
354 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
355 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
357 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
358 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
360 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
361 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
363 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
364 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
366 if ((nsect
== 0x55) && (lbal
== 0xaa))
367 return 1; /* we found a device */
369 return 0; /* nothing found */
373 * ata_devchk - PATA device presence detection
374 * @ap: ATA channel to examine
375 * @device: Device to examine (starting at zero)
377 * Dispatch ATA device presence detection, depending
378 * on whether we are using PIO or MMIO to talk to the
379 * ATA shadow registers.
385 static unsigned int ata_devchk(struct ata_port
*ap
,
388 if (ap
->flags
& ATA_FLAG_MMIO
)
389 return ata_mmio_devchk(ap
, device
);
390 return ata_pio_devchk(ap
, device
);
394 * ata_dev_classify - determine device type based on ATA-spec signature
395 * @tf: ATA taskfile register set for device to be identified
397 * Determine from taskfile register contents whether a device is
398 * ATA or ATAPI, as per "Signature and persistence" section
399 * of ATA/PI spec (volume 1, sect 5.14).
405 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
406 * the event of failure.
409 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
411 /* Apple's open source Darwin code hints that some devices only
412 * put a proper signature into the LBA mid/high registers,
413 * So, we only check those. It's sufficient for uniqueness.
416 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
417 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
418 DPRINTK("found ATA device by sig\n");
422 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
423 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
424 DPRINTK("found ATAPI device by sig\n");
425 return ATA_DEV_ATAPI
;
428 DPRINTK("unknown device\n");
429 return ATA_DEV_UNKNOWN
;
433 * ata_dev_try_classify - Parse returned ATA device signature
434 * @ap: ATA channel to examine
435 * @device: Device to examine (starting at zero)
436 * @r_err: Value of error register on completion
438 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
439 * an ATA/ATAPI-defined set of values is placed in the ATA
440 * shadow registers, indicating the results of device detection
443 * Select the ATA device, and read the values from the ATA shadow
444 * registers. Then parse according to the Error register value,
445 * and the spec-defined values examined by ata_dev_classify().
451 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
455 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
457 struct ata_taskfile tf
;
461 ap
->ops
->dev_select(ap
, device
);
463 memset(&tf
, 0, sizeof(tf
));
465 ap
->ops
->tf_read(ap
, &tf
);
470 /* see if device passed diags */
473 else if ((device
== 0) && (err
== 0x81))
478 /* determine if device is ATA or ATAPI */
479 class = ata_dev_classify(&tf
);
481 if (class == ATA_DEV_UNKNOWN
)
483 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
489 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
490 * @id: IDENTIFY DEVICE results we will examine
491 * @s: string into which data is output
492 * @ofs: offset into identify device page
493 * @len: length of string to return. must be an even number.
495 * The strings in the IDENTIFY DEVICE page are broken up into
496 * 16-bit chunks. Run through the string, and output each
497 * 8-bit chunk linearly, regardless of platform.
503 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
504 unsigned int ofs
, unsigned int len
)
523 * ata_dev_id_c_string - Convert IDENTIFY DEVICE page into C string
524 * @id: IDENTIFY DEVICE results we will examine
525 * @s: string into which data is output
526 * @ofs: offset into identify device page
527 * @len: length of string to return. must be an odd number.
529 * This function is identical to ata_dev_id_string except that it
530 * trims trailing spaces and terminates the resulting string with
531 * null. @len must be actual maximum length (even number) + 1.
536 void ata_dev_id_c_string(const u16
*id
, unsigned char *s
,
537 unsigned int ofs
, unsigned int len
)
543 ata_dev_id_string(id
, s
, ofs
, len
- 1);
545 p
= s
+ strnlen(s
, len
- 1);
546 while (p
> s
&& p
[-1] == ' ')
551 static u64
ata_id_n_sectors(const u16
*id
)
553 if (ata_id_has_lba(id
)) {
554 if (ata_id_has_lba48(id
))
555 return ata_id_u64(id
, 100);
557 return ata_id_u32(id
, 60);
559 if (ata_id_current_chs_valid(id
))
560 return ata_id_u32(id
, 57);
562 return id
[1] * id
[3] * id
[6];
567 * ata_noop_dev_select - Select device 0/1 on ATA bus
568 * @ap: ATA channel to manipulate
569 * @device: ATA device (numbered from zero) to select
571 * This function performs no actual function.
573 * May be used as the dev_select() entry in ata_port_operations.
578 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
584 * ata_std_dev_select - Select device 0/1 on ATA bus
585 * @ap: ATA channel to manipulate
586 * @device: ATA device (numbered from zero) to select
588 * Use the method defined in the ATA specification to
589 * make either device 0, or device 1, active on the
590 * ATA channel. Works with both PIO and MMIO.
592 * May be used as the dev_select() entry in ata_port_operations.
598 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
603 tmp
= ATA_DEVICE_OBS
;
605 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
607 if (ap
->flags
& ATA_FLAG_MMIO
) {
608 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
610 outb(tmp
, ap
->ioaddr
.device_addr
);
612 ata_pause(ap
); /* needed; also flushes, for mmio */
616 * ata_dev_select - Select device 0/1 on ATA bus
617 * @ap: ATA channel to manipulate
618 * @device: ATA device (numbered from zero) to select
619 * @wait: non-zero to wait for Status register BSY bit to clear
620 * @can_sleep: non-zero if context allows sleeping
622 * Use the method defined in the ATA specification to
623 * make either device 0, or device 1, active on the
626 * This is a high-level version of ata_std_dev_select(),
627 * which additionally provides the services of inserting
628 * the proper pauses and status polling, where needed.
634 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
635 unsigned int wait
, unsigned int can_sleep
)
637 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
638 ap
->id
, device
, wait
);
643 ap
->ops
->dev_select(ap
, device
);
646 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
653 * ata_dump_id - IDENTIFY DEVICE info debugging output
654 * @id: IDENTIFY DEVICE page to dump
656 * Dump selected 16-bit words from the given IDENTIFY DEVICE
663 static inline void ata_dump_id(const u16
*id
)
665 DPRINTK("49==0x%04x "
675 DPRINTK("80==0x%04x "
685 DPRINTK("88==0x%04x "
692 * Compute the PIO modes available for this device. This is not as
693 * trivial as it seems if we must consider early devices correctly.
695 * FIXME: pre IDE drive timing (do we care ?).
698 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
702 /* Usual case. Word 53 indicates word 64 is valid */
703 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
704 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
710 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
711 number for the maximum. Turn it into a mask and return it */
712 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
714 /* But wait.. there's more. Design your standards by committee and
715 you too can get a free iordy field to process. However its the
716 speeds not the modes that are supported... Note drivers using the
717 timing API will get this right anyway */
721 ata_queue_packet_task(struct ata_port
*ap
)
723 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
724 queue_work(ata_wq
, &ap
->packet_task
);
728 ata_queue_pio_task(struct ata_port
*ap
)
730 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
731 queue_work(ata_wq
, &ap
->pio_task
);
735 ata_queue_delayed_pio_task(struct ata_port
*ap
, unsigned long delay
)
737 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
738 queue_delayed_work(ata_wq
, &ap
->pio_task
, delay
);
742 * ata_flush_pio_tasks - Flush pio_task and packet_task
743 * @ap: the target ata_port
745 * After this function completes, pio_task and packet_task are
746 * guranteed not to be running or scheduled.
749 * Kernel thread context (may sleep)
752 static void ata_flush_pio_tasks(struct ata_port
*ap
)
759 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
760 ap
->flags
|= ATA_FLAG_FLUSH_PIO_TASK
;
761 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
763 DPRINTK("flush #1\n");
764 flush_workqueue(ata_wq
);
767 * At this point, if a task is running, it's guaranteed to see
768 * the FLUSH flag; thus, it will never queue pio tasks again.
771 tmp
|= cancel_delayed_work(&ap
->pio_task
);
772 tmp
|= cancel_delayed_work(&ap
->packet_task
);
774 DPRINTK("flush #2\n");
775 flush_workqueue(ata_wq
);
778 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
779 ap
->flags
&= ~ATA_FLAG_FLUSH_PIO_TASK
;
780 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
785 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
787 struct completion
*waiting
= qc
->private_data
;
789 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
794 * ata_exec_internal - execute libata internal command
795 * @ap: Port to which the command is sent
796 * @dev: Device to which the command is sent
797 * @tf: Taskfile registers for the command and the result
798 * @dma_dir: Data tranfer direction of the command
799 * @buf: Data buffer of the command
800 * @buflen: Length of data buffer
802 * Executes libata internal command with timeout. @tf contains
803 * command on entry and result on return. Timeout and error
804 * conditions are reported via return value. No recovery action
805 * is taken after a command times out. It's caller's duty to
806 * clean up after timeout.
809 * None. Should be called with kernel context, might sleep.
813 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
814 struct ata_taskfile
*tf
,
815 int dma_dir
, void *buf
, unsigned int buflen
)
817 u8 command
= tf
->command
;
818 struct ata_queued_cmd
*qc
;
819 DECLARE_COMPLETION(wait
);
821 unsigned int err_mask
;
823 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
825 qc
= ata_qc_new_init(ap
, dev
);
829 qc
->dma_dir
= dma_dir
;
830 if (dma_dir
!= DMA_NONE
) {
831 ata_sg_init_one(qc
, buf
, buflen
);
832 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
835 qc
->private_data
= &wait
;
836 qc
->complete_fn
= ata_qc_complete_internal
;
838 qc
->err_mask
= ata_qc_issue(qc
);
842 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
844 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
845 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
847 /* We're racing with irq here. If we lose, the
848 * following test prevents us from completing the qc
849 * again. If completion irq occurs after here but
850 * before the caller cleans up, it will result in a
851 * spurious interrupt. We can live with that.
853 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
854 qc
->err_mask
= AC_ERR_TIMEOUT
;
856 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
860 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
864 err_mask
= qc
->err_mask
;
872 * ata_pio_need_iordy - check if iordy needed
875 * Check if the current speed of the device requires IORDY. Used
876 * by various controllers for chip configuration.
879 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
882 int speed
= adev
->pio_mode
- XFER_PIO_0
;
889 /* If we have no drive specific rule, then PIO 2 is non IORDY */
891 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
892 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
893 /* Is the speed faster than the drive allows non IORDY ? */
895 /* This is cycle times not frequency - watch the logic! */
896 if (pio
> 240) /* PIO2 is 240nS per cycle */
905 * ata_dev_identify - obtain IDENTIFY x DEVICE page
906 * @ap: port on which device we wish to probe resides
907 * @device: device bus address, starting at zero
909 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
910 * command, and read back the 512-byte device information page.
911 * The device information page is fed to us via the standard
912 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
913 * using standard PIO-IN paths)
915 * After reading the device information page, we use several
916 * bits of information from it to initialize data structures
917 * that will be used during the lifetime of the ata_device.
918 * Other data from the info page is used to disqualify certain
919 * older ATA devices we do not wish to support.
922 * Inherited from caller. Some functions called by this function
923 * obtain the host_set lock.
926 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
928 struct ata_device
*dev
= &ap
->device
[device
];
929 unsigned int major_version
;
930 unsigned long xfer_modes
;
931 unsigned int using_edd
;
932 struct ata_taskfile tf
;
933 unsigned int err_mask
;
936 if (!ata_dev_present(dev
)) {
937 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
942 if (ap
->ops
->probe_reset
||
943 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
948 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
950 WARN_ON(dev
->class != ATA_DEV_ATA
&& dev
->class != ATA_DEV_ATAPI
&&
951 dev
->class != ATA_DEV_NONE
);
953 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
956 ata_tf_init(ap
, &tf
, device
);
958 if (dev
->class == ATA_DEV_ATA
) {
959 tf
.command
= ATA_CMD_ID_ATA
;
960 DPRINTK("do ATA identify\n");
962 tf
.command
= ATA_CMD_ID_ATAPI
;
963 DPRINTK("do ATAPI identify\n");
966 tf
.protocol
= ATA_PROT_PIO
;
968 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
969 dev
->id
, sizeof(dev
->id
));
972 if (err_mask
& ~AC_ERR_DEV
)
976 * arg! EDD works for all test cases, but seems to return
977 * the ATA signature for some ATAPI devices. Until the
978 * reason for this is found and fixed, we fix up the mess
979 * here. If IDENTIFY DEVICE returns command aborted
980 * (as ATAPI devices do), then we issue an
981 * IDENTIFY PACKET DEVICE.
983 * ATA software reset (SRST, the default) does not appear
984 * to have this problem.
986 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
988 if (err
& ATA_ABORTED
) {
989 dev
->class = ATA_DEV_ATAPI
;
996 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
998 /* print device capabilities */
999 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1000 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1001 ap
->id
, device
, dev
->id
[49],
1002 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1003 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1007 * common ATA, ATAPI feature tests
1010 /* we require DMA support (bits 8 of word 49) */
1011 if (!ata_id_has_dma(dev
->id
)) {
1012 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1016 /* quick-n-dirty find max transfer mode; for printk only */
1017 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1019 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1021 xfer_modes
= ata_pio_modes(dev
);
1023 ata_dump_id(dev
->id
);
1025 /* ATA-specific feature tests */
1026 if (dev
->class == ATA_DEV_ATA
) {
1027 dev
->n_sectors
= ata_id_n_sectors(dev
->id
);
1029 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1032 /* get major version */
1033 major_version
= ata_id_major_version(dev
->id
);
1036 * The exact sequence expected by certain pre-ATA4 drives is:
1039 * INITIALIZE DEVICE PARAMETERS
1041 * Some drives were very specific about that exact sequence.
1043 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1044 ata_dev_init_params(ap
, dev
);
1046 /* current CHS translation info (id[53-58]) might be
1047 * changed. reread the identify device info.
1049 ata_dev_reread_id(ap
, dev
);
1052 if (ata_id_has_lba(dev
->id
)) {
1053 dev
->flags
|= ATA_DFLAG_LBA
;
1055 if (ata_id_has_lba48(dev
->id
))
1056 dev
->flags
|= ATA_DFLAG_LBA48
;
1058 /* print device info to dmesg */
1059 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1062 ata_mode_string(xfer_modes
),
1063 (unsigned long long)dev
->n_sectors
,
1064 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1068 /* Default translation */
1069 dev
->cylinders
= dev
->id
[1];
1070 dev
->heads
= dev
->id
[3];
1071 dev
->sectors
= dev
->id
[6];
1073 if (ata_id_current_chs_valid(dev
->id
)) {
1074 /* Current CHS translation is valid. */
1075 dev
->cylinders
= dev
->id
[54];
1076 dev
->heads
= dev
->id
[55];
1077 dev
->sectors
= dev
->id
[56];
1080 /* print device info to dmesg */
1081 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1084 ata_mode_string(xfer_modes
),
1085 (unsigned long long)dev
->n_sectors
,
1086 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1093 /* ATAPI-specific feature tests */
1094 else if (dev
->class == ATA_DEV_ATAPI
) {
1095 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1098 rc
= atapi_cdb_len(dev
->id
);
1099 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1100 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1103 dev
->cdb_len
= (unsigned int) rc
;
1105 /* print device info to dmesg */
1106 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1108 ata_mode_string(xfer_modes
));
1111 ap
->host
->max_cmd_len
= 0;
1112 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1113 ap
->host
->max_cmd_len
= max_t(unsigned int,
1114 ap
->host
->max_cmd_len
,
1115 ap
->device
[i
].cdb_len
);
1117 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1121 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1124 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1125 DPRINTK("EXIT, err\n");
1129 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1130 struct ata_device
*dev
)
1132 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1136 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1143 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1145 /* limit bridge transfers to udma5, 200 sectors */
1146 if (ata_dev_knobble(ap
, &ap
->device
[i
])) {
1147 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1149 ap
->udma_mask
&= ATA_UDMA5
;
1150 ap
->device
[i
].max_sectors
= ATA_MAX_SECTORS
;
1153 if (ap
->ops
->dev_config
)
1154 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1158 * ata_bus_probe - Reset and probe ATA bus
1161 * Master ATA bus probing function. Initiates a hardware-dependent
1162 * bus reset, then attempts to identify any devices found on
1166 * PCI/etc. bus probe sem.
1169 * Zero on success, non-zero on error.
1172 static int ata_bus_probe(struct ata_port
*ap
)
1174 unsigned int i
, found
= 0;
1176 if (ap
->ops
->probe_reset
) {
1177 unsigned int classes
[ATA_MAX_DEVICES
];
1182 rc
= ap
->ops
->probe_reset(ap
, classes
);
1184 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1185 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1186 classes
[i
] = ATA_DEV_NONE
;
1187 ap
->device
[i
].class = classes
[i
];
1190 printk(KERN_ERR
"ata%u: probe reset failed, "
1191 "disabling port\n", ap
->id
);
1192 ata_port_disable(ap
);
1195 ap
->ops
->phy_reset(ap
);
1197 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1200 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1201 ata_dev_identify(ap
, i
);
1202 if (ata_dev_present(&ap
->device
[i
])) {
1204 ata_dev_config(ap
,i
);
1208 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1209 goto err_out_disable
;
1212 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1213 goto err_out_disable
;
1218 ap
->ops
->port_disable(ap
);
1224 * ata_port_probe - Mark port as enabled
1225 * @ap: Port for which we indicate enablement
1227 * Modify @ap data structure such that the system
1228 * thinks that the entire port is enabled.
1230 * LOCKING: host_set lock, or some other form of
1234 void ata_port_probe(struct ata_port
*ap
)
1236 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1240 * sata_print_link_status - Print SATA link status
1241 * @ap: SATA port to printk link status about
1243 * This function prints link speed and status of a SATA link.
1248 static void sata_print_link_status(struct ata_port
*ap
)
1253 if (!ap
->ops
->scr_read
)
1256 sstatus
= scr_read(ap
, SCR_STATUS
);
1258 if (sata_dev_present(ap
)) {
1259 tmp
= (sstatus
>> 4) & 0xf;
1262 else if (tmp
& (1 << 1))
1265 speed
= "<unknown>";
1266 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1267 ap
->id
, speed
, sstatus
);
1269 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1275 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1276 * @ap: SATA port associated with target SATA PHY.
1278 * This function issues commands to standard SATA Sxxx
1279 * PHY registers, to wake up the phy (and device), and
1280 * clear any reset condition.
1283 * PCI/etc. bus probe sem.
1286 void __sata_phy_reset(struct ata_port
*ap
)
1289 unsigned long timeout
= jiffies
+ (HZ
* 5);
1291 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1292 /* issue phy wake/reset */
1293 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1294 /* Couldn't find anything in SATA I/II specs, but
1295 * AHCI-1.1 10.4.2 says at least 1 ms. */
1298 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1300 /* wait for phy to become ready, if necessary */
1303 sstatus
= scr_read(ap
, SCR_STATUS
);
1304 if ((sstatus
& 0xf) != 1)
1306 } while (time_before(jiffies
, timeout
));
1308 /* print link status */
1309 sata_print_link_status(ap
);
1311 /* TODO: phy layer with polling, timeouts, etc. */
1312 if (sata_dev_present(ap
))
1315 ata_port_disable(ap
);
1317 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1320 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1321 ata_port_disable(ap
);
1325 ap
->cbl
= ATA_CBL_SATA
;
1329 * sata_phy_reset - Reset SATA bus.
1330 * @ap: SATA port associated with target SATA PHY.
1332 * This function resets the SATA bus, and then probes
1333 * the bus for devices.
1336 * PCI/etc. bus probe sem.
1339 void sata_phy_reset(struct ata_port
*ap
)
1341 __sata_phy_reset(ap
);
1342 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1348 * ata_port_disable - Disable port.
1349 * @ap: Port to be disabled.
1351 * Modify @ap data structure such that the system
1352 * thinks that the entire port is disabled, and should
1353 * never attempt to probe or communicate with devices
1356 * LOCKING: host_set lock, or some other form of
1360 void ata_port_disable(struct ata_port
*ap
)
1362 ap
->device
[0].class = ATA_DEV_NONE
;
1363 ap
->device
[1].class = ATA_DEV_NONE
;
1364 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1368 * This mode timing computation functionality is ported over from
1369 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1372 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1373 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1374 * for PIO 5, which is a nonstandard extension and UDMA6, which
1375 * is currently supported only by Maxtor drives.
1378 static const struct ata_timing ata_timing
[] = {
1380 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1381 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1382 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1383 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1385 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1386 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1387 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1389 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1391 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1392 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1393 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1395 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1396 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1397 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1399 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1400 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1401 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1403 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1404 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1405 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1407 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1412 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1413 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1415 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1417 q
->setup
= EZ(t
->setup
* 1000, T
);
1418 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1419 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1420 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1421 q
->active
= EZ(t
->active
* 1000, T
);
1422 q
->recover
= EZ(t
->recover
* 1000, T
);
1423 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1424 q
->udma
= EZ(t
->udma
* 1000, UT
);
1427 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1428 struct ata_timing
*m
, unsigned int what
)
1430 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1431 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1432 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1433 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1434 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1435 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1436 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1437 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1440 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1442 const struct ata_timing
*t
;
1444 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1445 if (t
->mode
== 0xFF)
1450 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1451 struct ata_timing
*t
, int T
, int UT
)
1453 const struct ata_timing
*s
;
1454 struct ata_timing p
;
1460 if (!(s
= ata_timing_find_mode(speed
)))
1463 memcpy(t
, s
, sizeof(*s
));
1466 * If the drive is an EIDE drive, it can tell us it needs extended
1467 * PIO/MW_DMA cycle timing.
1470 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1471 memset(&p
, 0, sizeof(p
));
1472 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1473 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1474 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1475 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1476 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1478 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1482 * Convert the timing to bus clock counts.
1485 ata_timing_quantize(t
, t
, T
, UT
);
1488 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1489 * S.M.A.R.T * and some other commands. We have to ensure that the
1490 * DMA cycle timing is slower/equal than the fastest PIO timing.
1493 if (speed
> XFER_PIO_4
) {
1494 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1495 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1499 * Lengthen active & recovery time so that cycle time is correct.
1502 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1503 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1504 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1507 if (t
->active
+ t
->recover
< t
->cycle
) {
1508 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1509 t
->recover
= t
->cycle
- t
->active
;
1515 static const struct {
1518 } xfer_mode_classes
[] = {
1519 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1520 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1521 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1524 static u8
base_from_shift(unsigned int shift
)
1528 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1529 if (xfer_mode_classes
[i
].shift
== shift
)
1530 return xfer_mode_classes
[i
].base
;
1535 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1540 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1543 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1544 dev
->flags
|= ATA_DFLAG_PIO
;
1546 ata_dev_set_xfermode(ap
, dev
);
1548 base
= base_from_shift(dev
->xfer_shift
);
1549 ofs
= dev
->xfer_mode
- base
;
1550 idx
= ofs
+ dev
->xfer_shift
;
1551 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1553 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1554 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1556 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1557 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1560 static int ata_host_set_pio(struct ata_port
*ap
)
1566 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1569 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1573 base
= base_from_shift(ATA_SHIFT_PIO
);
1574 xfer_mode
= base
+ x
;
1576 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1577 (int)base
, (int)xfer_mode
, mask
, x
);
1579 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1580 struct ata_device
*dev
= &ap
->device
[i
];
1581 if (ata_dev_present(dev
)) {
1582 dev
->pio_mode
= xfer_mode
;
1583 dev
->xfer_mode
= xfer_mode
;
1584 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1585 if (ap
->ops
->set_piomode
)
1586 ap
->ops
->set_piomode(ap
, dev
);
1593 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1594 unsigned int xfer_shift
)
1598 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1599 struct ata_device
*dev
= &ap
->device
[i
];
1600 if (ata_dev_present(dev
)) {
1601 dev
->dma_mode
= xfer_mode
;
1602 dev
->xfer_mode
= xfer_mode
;
1603 dev
->xfer_shift
= xfer_shift
;
1604 if (ap
->ops
->set_dmamode
)
1605 ap
->ops
->set_dmamode(ap
, dev
);
1611 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1612 * @ap: port on which timings will be programmed
1614 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1617 * PCI/etc. bus probe sem.
1619 static void ata_set_mode(struct ata_port
*ap
)
1621 unsigned int xfer_shift
;
1625 /* step 1: always set host PIO timings */
1626 rc
= ata_host_set_pio(ap
);
1630 /* step 2: choose the best data xfer mode */
1631 xfer_mode
= xfer_shift
= 0;
1632 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1636 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1637 if (xfer_shift
!= ATA_SHIFT_PIO
)
1638 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1640 /* step 4: update devices' xfer mode */
1641 ata_dev_set_mode(ap
, &ap
->device
[0]);
1642 ata_dev_set_mode(ap
, &ap
->device
[1]);
1644 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1647 if (ap
->ops
->post_set_mode
)
1648 ap
->ops
->post_set_mode(ap
);
1653 ata_port_disable(ap
);
1657 * ata_tf_to_host - issue ATA taskfile to host controller
1658 * @ap: port to which command is being issued
1659 * @tf: ATA taskfile register set
1661 * Issues ATA taskfile register set to ATA host controller,
1662 * with proper synchronization with interrupt handler and
1666 * spin_lock_irqsave(host_set lock)
1669 static inline void ata_tf_to_host(struct ata_port
*ap
,
1670 const struct ata_taskfile
*tf
)
1672 ap
->ops
->tf_load(ap
, tf
);
1673 ap
->ops
->exec_command(ap
, tf
);
1677 * ata_busy_sleep - sleep until BSY clears, or timeout
1678 * @ap: port containing status register to be polled
1679 * @tmout_pat: impatience timeout
1680 * @tmout: overall timeout
1682 * Sleep until ATA Status register bit BSY clears,
1683 * or a timeout occurs.
1688 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1689 unsigned long tmout_pat
, unsigned long tmout
)
1691 unsigned long timer_start
, timeout
;
1694 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1695 timer_start
= jiffies
;
1696 timeout
= timer_start
+ tmout_pat
;
1697 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1699 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1702 if (status
& ATA_BUSY
)
1703 printk(KERN_WARNING
"ata%u is slow to respond, "
1704 "please be patient\n", ap
->id
);
1706 timeout
= timer_start
+ tmout
;
1707 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1709 status
= ata_chk_status(ap
);
1712 if (status
& ATA_BUSY
) {
1713 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1714 ap
->id
, tmout
/ HZ
);
1721 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1723 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1724 unsigned int dev0
= devmask
& (1 << 0);
1725 unsigned int dev1
= devmask
& (1 << 1);
1726 unsigned long timeout
;
1728 /* if device 0 was found in ata_devchk, wait for its
1732 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1734 /* if device 1 was found in ata_devchk, wait for
1735 * register access, then wait for BSY to clear
1737 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1741 ap
->ops
->dev_select(ap
, 1);
1742 if (ap
->flags
& ATA_FLAG_MMIO
) {
1743 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1744 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1746 nsect
= inb(ioaddr
->nsect_addr
);
1747 lbal
= inb(ioaddr
->lbal_addr
);
1749 if ((nsect
== 1) && (lbal
== 1))
1751 if (time_after(jiffies
, timeout
)) {
1755 msleep(50); /* give drive a breather */
1758 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1760 /* is all this really necessary? */
1761 ap
->ops
->dev_select(ap
, 0);
1763 ap
->ops
->dev_select(ap
, 1);
1765 ap
->ops
->dev_select(ap
, 0);
1769 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1770 * @ap: Port to reset and probe
1772 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1773 * probe the bus. Not often used these days.
1776 * PCI/etc. bus probe sem.
1777 * Obtains host_set lock.
1781 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1783 struct ata_taskfile tf
;
1784 unsigned long flags
;
1786 /* set up execute-device-diag (bus reset) taskfile */
1787 /* also, take interrupts to a known state (disabled) */
1788 DPRINTK("execute-device-diag\n");
1789 ata_tf_init(ap
, &tf
, 0);
1791 tf
.command
= ATA_CMD_EDD
;
1792 tf
.protocol
= ATA_PROT_NODATA
;
1795 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1796 ata_tf_to_host(ap
, &tf
);
1797 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1799 /* spec says at least 2ms. but who knows with those
1800 * crazy ATAPI devices...
1804 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1807 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1808 unsigned int devmask
)
1810 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1812 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1814 /* software reset. causes dev0 to be selected */
1815 if (ap
->flags
& ATA_FLAG_MMIO
) {
1816 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1817 udelay(20); /* FIXME: flush */
1818 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1819 udelay(20); /* FIXME: flush */
1820 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1822 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1824 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1826 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1829 /* spec mandates ">= 2ms" before checking status.
1830 * We wait 150ms, because that was the magic delay used for
1831 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1832 * between when the ATA command register is written, and then
1833 * status is checked. Because waiting for "a while" before
1834 * checking status is fine, post SRST, we perform this magic
1835 * delay here as well.
1839 ata_bus_post_reset(ap
, devmask
);
1845 * ata_bus_reset - reset host port and associated ATA channel
1846 * @ap: port to reset
1848 * This is typically the first time we actually start issuing
1849 * commands to the ATA channel. We wait for BSY to clear, then
1850 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1851 * result. Determine what devices, if any, are on the channel
1852 * by looking at the device 0/1 error register. Look at the signature
1853 * stored in each device's taskfile registers, to determine if
1854 * the device is ATA or ATAPI.
1857 * PCI/etc. bus probe sem.
1858 * Obtains host_set lock.
1861 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1864 void ata_bus_reset(struct ata_port
*ap
)
1866 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1867 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1869 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1871 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1873 /* determine if device 0/1 are present */
1874 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1877 dev0
= ata_devchk(ap
, 0);
1879 dev1
= ata_devchk(ap
, 1);
1883 devmask
|= (1 << 0);
1885 devmask
|= (1 << 1);
1887 /* select device 0 again */
1888 ap
->ops
->dev_select(ap
, 0);
1890 /* issue bus reset */
1891 if (ap
->flags
& ATA_FLAG_SRST
)
1892 rc
= ata_bus_softreset(ap
, devmask
);
1893 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1894 /* set up device control */
1895 if (ap
->flags
& ATA_FLAG_MMIO
)
1896 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1898 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1899 rc
= ata_bus_edd(ap
);
1906 * determine by signature whether we have ATA or ATAPI devices
1908 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1909 if ((slave_possible
) && (err
!= 0x81))
1910 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1912 /* re-enable interrupts */
1913 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1916 /* is double-select really necessary? */
1917 if (ap
->device
[1].class != ATA_DEV_NONE
)
1918 ap
->ops
->dev_select(ap
, 1);
1919 if (ap
->device
[0].class != ATA_DEV_NONE
)
1920 ap
->ops
->dev_select(ap
, 0);
1922 /* if no devices were detected, disable this port */
1923 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1924 (ap
->device
[1].class == ATA_DEV_NONE
))
1927 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
1928 /* set up device control for ATA_FLAG_SATA_RESET */
1929 if (ap
->flags
& ATA_FLAG_MMIO
)
1930 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1932 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1939 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
1940 ap
->ops
->port_disable(ap
);
1945 static int sata_phy_resume(struct ata_port
*ap
)
1947 unsigned long timeout
= jiffies
+ (HZ
* 5);
1950 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1952 /* Wait for phy to become ready, if necessary. */
1955 sstatus
= scr_read(ap
, SCR_STATUS
);
1956 if ((sstatus
& 0xf) != 1)
1958 } while (time_before(jiffies
, timeout
));
1964 * ata_std_probeinit - initialize probing
1965 * @ap: port to be probed
1967 * @ap is about to be probed. Initialize it. This function is
1968 * to be used as standard callback for ata_drive_probe_reset().
1970 * NOTE!!! Do not use this function as probeinit if a low level
1971 * driver implements only hardreset. Just pass NULL as probeinit
1972 * in that case. Using this function is probably okay but doing
1973 * so makes reset sequence different from the original
1974 * ->phy_reset implementation and Jeff nervous. :-P
1976 extern void ata_std_probeinit(struct ata_port
*ap
)
1978 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
1979 sata_phy_resume(ap
);
1980 if (sata_dev_present(ap
))
1981 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1986 * ata_std_softreset - reset host port via ATA SRST
1987 * @ap: port to reset
1988 * @verbose: fail verbosely
1989 * @classes: resulting classes of attached devices
1991 * Reset host port using ATA SRST. This function is to be used
1992 * as standard callback for ata_drive_*_reset() functions.
1995 * Kernel thread context (may sleep)
1998 * 0 on success, -errno otherwise.
2000 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2002 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2003 unsigned int devmask
= 0, err_mask
;
2008 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2009 classes
[0] = ATA_DEV_NONE
;
2013 /* determine if device 0/1 are present */
2014 if (ata_devchk(ap
, 0))
2015 devmask
|= (1 << 0);
2016 if (slave_possible
&& ata_devchk(ap
, 1))
2017 devmask
|= (1 << 1);
2019 /* select device 0 again */
2020 ap
->ops
->dev_select(ap
, 0);
2022 /* issue bus reset */
2023 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2024 err_mask
= ata_bus_softreset(ap
, devmask
);
2027 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2030 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2035 /* determine by signature whether we have ATA or ATAPI devices */
2036 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2037 if (slave_possible
&& err
!= 0x81)
2038 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2041 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2046 * sata_std_hardreset - reset host port via SATA phy reset
2047 * @ap: port to reset
2048 * @verbose: fail verbosely
2049 * @class: resulting class of attached device
2051 * SATA phy-reset host port using DET bits of SControl register.
2052 * This function is to be used as standard callback for
2053 * ata_drive_*_reset().
2056 * Kernel thread context (may sleep)
2059 * 0 on success, -errno otherwise.
2061 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2065 /* Issue phy wake/reset */
2066 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2069 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2070 * 10.4.2 says at least 1 ms.
2074 /* Bring phy back */
2075 sata_phy_resume(ap
);
2077 /* TODO: phy layer with polling, timeouts, etc. */
2078 if (!sata_dev_present(ap
)) {
2079 *class = ATA_DEV_NONE
;
2080 DPRINTK("EXIT, link offline\n");
2084 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2086 printk(KERN_ERR
"ata%u: COMRESET failed "
2087 "(device not ready)\n", ap
->id
);
2089 DPRINTK("EXIT, device not ready\n");
2093 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2095 *class = ata_dev_try_classify(ap
, 0, NULL
);
2097 DPRINTK("EXIT, class=%u\n", *class);
2102 * ata_std_postreset - standard postreset callback
2103 * @ap: the target ata_port
2104 * @classes: classes of attached devices
2106 * This function is invoked after a successful reset. Note that
2107 * the device might have been reset more than once using
2108 * different reset methods before postreset is invoked.
2109 * postreset is also reponsible for setting cable type.
2111 * This function is to be used as standard callback for
2112 * ata_drive_*_reset().
2115 * Kernel thread context (may sleep)
2117 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2121 /* set cable type */
2122 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2123 ap
->cbl
= ATA_CBL_SATA
;
2125 /* print link status */
2126 if (ap
->cbl
== ATA_CBL_SATA
)
2127 sata_print_link_status(ap
);
2129 /* re-enable interrupts */
2130 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2133 /* is double-select really necessary? */
2134 if (classes
[0] != ATA_DEV_NONE
)
2135 ap
->ops
->dev_select(ap
, 1);
2136 if (classes
[1] != ATA_DEV_NONE
)
2137 ap
->ops
->dev_select(ap
, 0);
2139 /* bail out if no device is present */
2140 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2141 DPRINTK("EXIT, no device\n");
2145 /* set up device control */
2146 if (ap
->ioaddr
.ctl_addr
) {
2147 if (ap
->flags
& ATA_FLAG_MMIO
)
2148 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2150 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2157 * ata_std_probe_reset - standard probe reset method
2158 * @ap: prot to perform probe-reset
2159 * @classes: resulting classes of attached devices
2161 * The stock off-the-shelf ->probe_reset method.
2164 * Kernel thread context (may sleep)
2167 * 0 on success, -errno otherwise.
2169 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2171 ata_reset_fn_t hardreset
;
2174 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2175 hardreset
= sata_std_hardreset
;
2177 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2178 ata_std_softreset
, hardreset
,
2179 ata_std_postreset
, classes
);
2182 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2183 ata_postreset_fn_t postreset
,
2184 unsigned int *classes
)
2188 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2189 classes
[i
] = ATA_DEV_UNKNOWN
;
2191 rc
= reset(ap
, 0, classes
);
2195 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2196 * is complete and convert all ATA_DEV_UNKNOWN to
2199 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2200 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2203 if (i
< ATA_MAX_DEVICES
)
2204 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2205 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2206 classes
[i
] = ATA_DEV_NONE
;
2209 postreset(ap
, classes
);
2211 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2215 * ata_drive_probe_reset - Perform probe reset with given methods
2216 * @ap: port to reset
2217 * @probeinit: probeinit method (can be NULL)
2218 * @softreset: softreset method (can be NULL)
2219 * @hardreset: hardreset method (can be NULL)
2220 * @postreset: postreset method (can be NULL)
2221 * @classes: resulting classes of attached devices
2223 * Reset the specified port and classify attached devices using
2224 * given methods. This function prefers softreset but tries all
2225 * possible reset sequences to reset and classify devices. This
2226 * function is intended to be used for constructing ->probe_reset
2227 * callback by low level drivers.
2229 * Reset methods should follow the following rules.
2231 * - Return 0 on sucess, -errno on failure.
2232 * - If classification is supported, fill classes[] with
2233 * recognized class codes.
2234 * - If classification is not supported, leave classes[] alone.
2235 * - If verbose is non-zero, print error message on failure;
2236 * otherwise, shut up.
2239 * Kernel thread context (may sleep)
2242 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2243 * if classification fails, and any error code from reset
2246 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2247 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2248 ata_postreset_fn_t postreset
, unsigned int *classes
)
2256 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2264 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2265 if (rc
== 0 || rc
!= -ENODEV
)
2269 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2274 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2275 const struct ata_device
*dev
)
2277 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2278 ap
->id
, dev
->devno
);
2281 static const char * const ata_dma_blacklist
[] = {
2300 "Toshiba CD-ROM XM-6202B",
2301 "TOSHIBA CD-ROM XM-1702BC",
2303 "E-IDE CD-ROM CR-840",
2306 "SAMSUNG CD-ROM SC-148C",
2307 "SAMSUNG CD-ROM SC",
2309 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2313 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2315 unsigned char model_num
[41];
2318 ata_dev_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2321 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2322 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2328 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2330 const struct ata_device
*master
, *slave
;
2333 master
= &ap
->device
[0];
2334 slave
= &ap
->device
[1];
2336 WARN_ON(!ata_dev_present(master
) && !ata_dev_present(slave
));
2338 if (shift
== ATA_SHIFT_UDMA
) {
2339 mask
= ap
->udma_mask
;
2340 if (ata_dev_present(master
)) {
2341 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2342 if (ata_dma_blacklisted(master
)) {
2344 ata_pr_blacklisted(ap
, master
);
2347 if (ata_dev_present(slave
)) {
2348 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2349 if (ata_dma_blacklisted(slave
)) {
2351 ata_pr_blacklisted(ap
, slave
);
2355 else if (shift
== ATA_SHIFT_MWDMA
) {
2356 mask
= ap
->mwdma_mask
;
2357 if (ata_dev_present(master
)) {
2358 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2359 if (ata_dma_blacklisted(master
)) {
2361 ata_pr_blacklisted(ap
, master
);
2364 if (ata_dev_present(slave
)) {
2365 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2366 if (ata_dma_blacklisted(slave
)) {
2368 ata_pr_blacklisted(ap
, slave
);
2372 else if (shift
== ATA_SHIFT_PIO
) {
2373 mask
= ap
->pio_mask
;
2374 if (ata_dev_present(master
)) {
2375 /* spec doesn't return explicit support for
2376 * PIO0-2, so we fake it
2378 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2383 if (ata_dev_present(slave
)) {
2384 /* spec doesn't return explicit support for
2385 * PIO0-2, so we fake it
2387 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2394 mask
= 0xffffffff; /* shut up compiler warning */
2401 /* find greatest bit */
2402 static int fgb(u32 bitmap
)
2407 for (i
= 0; i
< 32; i
++)
2408 if (bitmap
& (1 << i
))
2415 * ata_choose_xfer_mode - attempt to find best transfer mode
2416 * @ap: Port for which an xfer mode will be selected
2417 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2418 * @xfer_shift_out: (output) bit shift that selects this mode
2420 * Based on host and device capabilities, determine the
2421 * maximum transfer mode that is amenable to all.
2424 * PCI/etc. bus probe sem.
2427 * Zero on success, negative on error.
2430 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2432 unsigned int *xfer_shift_out
)
2434 unsigned int mask
, shift
;
2437 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2438 shift
= xfer_mode_classes
[i
].shift
;
2439 mask
= ata_get_mode_mask(ap
, shift
);
2443 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2444 *xfer_shift_out
= shift
;
2453 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2454 * @ap: Port associated with device @dev
2455 * @dev: Device to which command will be sent
2457 * Issue SET FEATURES - XFER MODE command to device @dev
2461 * PCI/etc. bus probe sem.
2464 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2466 struct ata_taskfile tf
;
2468 /* set up set-features taskfile */
2469 DPRINTK("set features - xfer mode\n");
2471 ata_tf_init(ap
, &tf
, dev
->devno
);
2472 tf
.command
= ATA_CMD_SET_FEATURES
;
2473 tf
.feature
= SETFEATURES_XFER
;
2474 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2475 tf
.protocol
= ATA_PROT_NODATA
;
2476 tf
.nsect
= dev
->xfer_mode
;
2478 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2479 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2481 ata_port_disable(ap
);
2488 * ata_dev_reread_id - Reread the device identify device info
2489 * @ap: port where the device is
2490 * @dev: device to reread the identify device info
2495 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2497 struct ata_taskfile tf
;
2499 ata_tf_init(ap
, &tf
, dev
->devno
);
2501 if (dev
->class == ATA_DEV_ATA
) {
2502 tf
.command
= ATA_CMD_ID_ATA
;
2503 DPRINTK("do ATA identify\n");
2505 tf
.command
= ATA_CMD_ID_ATAPI
;
2506 DPRINTK("do ATAPI identify\n");
2509 tf
.flags
|= ATA_TFLAG_DEVICE
;
2510 tf
.protocol
= ATA_PROT_PIO
;
2512 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2513 dev
->id
, sizeof(dev
->id
)))
2516 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2518 ata_dump_id(dev
->id
);
2524 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2525 ata_port_disable(ap
);
2529 * ata_dev_init_params - Issue INIT DEV PARAMS command
2530 * @ap: Port associated with device @dev
2531 * @dev: Device to which command will be sent
2536 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2538 struct ata_taskfile tf
;
2539 u16 sectors
= dev
->id
[6];
2540 u16 heads
= dev
->id
[3];
2542 /* Number of sectors per track 1-255. Number of heads 1-16 */
2543 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2546 /* set up init dev params taskfile */
2547 DPRINTK("init dev params \n");
2549 ata_tf_init(ap
, &tf
, dev
->devno
);
2550 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2551 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2552 tf
.protocol
= ATA_PROT_NODATA
;
2554 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2556 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2557 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2559 ata_port_disable(ap
);
2566 * ata_sg_clean - Unmap DMA memory associated with command
2567 * @qc: Command containing DMA memory to be released
2569 * Unmap all mapped DMA memory associated with this command.
2572 * spin_lock_irqsave(host_set lock)
2575 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2577 struct ata_port
*ap
= qc
->ap
;
2578 struct scatterlist
*sg
= qc
->__sg
;
2579 int dir
= qc
->dma_dir
;
2580 void *pad_buf
= NULL
;
2582 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2583 WARN_ON(sg
== NULL
);
2585 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2586 WARN_ON(qc
->n_elem
!= 1);
2588 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2590 /* if we padded the buffer out to 32-bit bound, and data
2591 * xfer direction is from-device, we must copy from the
2592 * pad buffer back into the supplied buffer
2594 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2595 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2597 if (qc
->flags
& ATA_QCFLAG_SG
) {
2599 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2600 /* restore last sg */
2601 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2603 struct scatterlist
*psg
= &qc
->pad_sgent
;
2604 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2605 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2606 kunmap_atomic(addr
, KM_IRQ0
);
2609 if (sg_dma_len(&sg
[0]) > 0)
2610 dma_unmap_single(ap
->host_set
->dev
,
2611 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2614 sg
->length
+= qc
->pad_len
;
2616 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2617 pad_buf
, qc
->pad_len
);
2620 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2625 * ata_fill_sg - Fill PCI IDE PRD table
2626 * @qc: Metadata associated with taskfile to be transferred
2628 * Fill PCI IDE PRD (scatter-gather) table with segments
2629 * associated with the current disk command.
2632 * spin_lock_irqsave(host_set lock)
2635 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2637 struct ata_port
*ap
= qc
->ap
;
2638 struct scatterlist
*sg
;
2641 WARN_ON(qc
->__sg
== NULL
);
2642 WARN_ON(qc
->n_elem
== 0);
2645 ata_for_each_sg(sg
, qc
) {
2649 /* determine if physical DMA addr spans 64K boundary.
2650 * Note h/w doesn't support 64-bit, so we unconditionally
2651 * truncate dma_addr_t to u32.
2653 addr
= (u32
) sg_dma_address(sg
);
2654 sg_len
= sg_dma_len(sg
);
2657 offset
= addr
& 0xffff;
2659 if ((offset
+ sg_len
) > 0x10000)
2660 len
= 0x10000 - offset
;
2662 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2663 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2664 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2673 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2676 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2677 * @qc: Metadata associated with taskfile to check
2679 * Allow low-level driver to filter ATA PACKET commands, returning
2680 * a status indicating whether or not it is OK to use DMA for the
2681 * supplied PACKET command.
2684 * spin_lock_irqsave(host_set lock)
2686 * RETURNS: 0 when ATAPI DMA can be used
2689 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2691 struct ata_port
*ap
= qc
->ap
;
2692 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2694 if (ap
->ops
->check_atapi_dma
)
2695 rc
= ap
->ops
->check_atapi_dma(qc
);
2700 * ata_qc_prep - Prepare taskfile for submission
2701 * @qc: Metadata associated with taskfile to be prepared
2703 * Prepare ATA taskfile for submission.
2706 * spin_lock_irqsave(host_set lock)
2708 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2710 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2717 * ata_sg_init_one - Associate command with memory buffer
2718 * @qc: Command to be associated
2719 * @buf: Memory buffer
2720 * @buflen: Length of memory buffer, in bytes.
2722 * Initialize the data-related elements of queued_cmd @qc
2723 * to point to a single memory buffer, @buf of byte length @buflen.
2726 * spin_lock_irqsave(host_set lock)
2729 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2731 struct scatterlist
*sg
;
2733 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2735 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2736 qc
->__sg
= &qc
->sgent
;
2738 qc
->orig_n_elem
= 1;
2742 sg_init_one(sg
, buf
, buflen
);
2746 * ata_sg_init - Associate command with scatter-gather table.
2747 * @qc: Command to be associated
2748 * @sg: Scatter-gather table.
2749 * @n_elem: Number of elements in s/g table.
2751 * Initialize the data-related elements of queued_cmd @qc
2752 * to point to a scatter-gather table @sg, containing @n_elem
2756 * spin_lock_irqsave(host_set lock)
2759 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2760 unsigned int n_elem
)
2762 qc
->flags
|= ATA_QCFLAG_SG
;
2764 qc
->n_elem
= n_elem
;
2765 qc
->orig_n_elem
= n_elem
;
2769 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2770 * @qc: Command with memory buffer to be mapped.
2772 * DMA-map the memory buffer associated with queued_cmd @qc.
2775 * spin_lock_irqsave(host_set lock)
2778 * Zero on success, negative on error.
2781 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2783 struct ata_port
*ap
= qc
->ap
;
2784 int dir
= qc
->dma_dir
;
2785 struct scatterlist
*sg
= qc
->__sg
;
2786 dma_addr_t dma_address
;
2788 /* we must lengthen transfers to end on a 32-bit boundary */
2789 qc
->pad_len
= sg
->length
& 3;
2791 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2792 struct scatterlist
*psg
= &qc
->pad_sgent
;
2794 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2796 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2798 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2799 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2802 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2803 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2805 sg
->length
-= qc
->pad_len
;
2807 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2808 sg
->length
, qc
->pad_len
);
2812 sg_dma_address(sg
) = 0;
2816 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2818 if (dma_mapping_error(dma_address
)) {
2820 sg
->length
+= qc
->pad_len
;
2824 sg_dma_address(sg
) = dma_address
;
2826 sg_dma_len(sg
) = sg
->length
;
2828 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2829 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2835 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2836 * @qc: Command with scatter-gather table to be mapped.
2838 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2841 * spin_lock_irqsave(host_set lock)
2844 * Zero on success, negative on error.
2848 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2850 struct ata_port
*ap
= qc
->ap
;
2851 struct scatterlist
*sg
= qc
->__sg
;
2852 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2853 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2855 VPRINTK("ENTER, ata%u\n", ap
->id
);
2856 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
2858 /* we must lengthen transfers to end on a 32-bit boundary */
2859 qc
->pad_len
= lsg
->length
& 3;
2861 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2862 struct scatterlist
*psg
= &qc
->pad_sgent
;
2863 unsigned int offset
;
2865 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2867 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2870 * psg->page/offset are used to copy to-be-written
2871 * data in this function or read data in ata_sg_clean.
2873 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2874 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2875 psg
->offset
= offset_in_page(offset
);
2877 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2878 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2879 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2880 kunmap_atomic(addr
, KM_IRQ0
);
2883 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2884 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2886 lsg
->length
-= qc
->pad_len
;
2887 if (lsg
->length
== 0)
2890 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2891 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2894 pre_n_elem
= qc
->n_elem
;
2895 if (trim_sg
&& pre_n_elem
)
2904 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2906 /* restore last sg */
2907 lsg
->length
+= qc
->pad_len
;
2911 DPRINTK("%d sg elements mapped\n", n_elem
);
2914 qc
->n_elem
= n_elem
;
2920 * ata_poll_qc_complete - turn irq back on and finish qc
2921 * @qc: Command to complete
2922 * @err_mask: ATA status register content
2925 * None. (grabs host lock)
2928 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2930 struct ata_port
*ap
= qc
->ap
;
2931 unsigned long flags
;
2933 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2934 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2936 ata_qc_complete(qc
);
2937 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2941 * ata_pio_poll - poll using PIO, depending on current state
2942 * @ap: the target ata_port
2945 * None. (executing in kernel thread context)
2948 * timeout value to use
2951 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2953 struct ata_queued_cmd
*qc
;
2955 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2956 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2958 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2959 WARN_ON(qc
== NULL
);
2961 switch (ap
->hsm_task_state
) {
2964 poll_state
= HSM_ST_POLL
;
2968 case HSM_ST_LAST_POLL
:
2969 poll_state
= HSM_ST_LAST_POLL
;
2970 reg_state
= HSM_ST_LAST
;
2977 status
= ata_chk_status(ap
);
2978 if (status
& ATA_BUSY
) {
2979 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2980 qc
->err_mask
|= AC_ERR_TIMEOUT
;
2981 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2984 ap
->hsm_task_state
= poll_state
;
2985 return ATA_SHORT_PAUSE
;
2988 ap
->hsm_task_state
= reg_state
;
2993 * ata_pio_complete - check if drive is busy or idle
2994 * @ap: the target ata_port
2997 * None. (executing in kernel thread context)
3000 * Non-zero if qc completed, zero otherwise.
3003 static int ata_pio_complete (struct ata_port
*ap
)
3005 struct ata_queued_cmd
*qc
;
3009 * This is purely heuristic. This is a fast path. Sometimes when
3010 * we enter, BSY will be cleared in a chk-status or two. If not,
3011 * the drive is probably seeking or something. Snooze for a couple
3012 * msecs, then chk-status again. If still busy, fall back to
3013 * HSM_ST_POLL state.
3015 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3016 if (drv_stat
& ATA_BUSY
) {
3018 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3019 if (drv_stat
& ATA_BUSY
) {
3020 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3021 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3026 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3027 WARN_ON(qc
== NULL
);
3029 drv_stat
= ata_wait_idle(ap
);
3030 if (!ata_ok(drv_stat
)) {
3031 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3032 ap
->hsm_task_state
= HSM_ST_ERR
;
3036 ap
->hsm_task_state
= HSM_ST_IDLE
;
3038 WARN_ON(qc
->err_mask
);
3039 ata_poll_qc_complete(qc
);
3041 /* another command may start at this point */
3048 * swap_buf_le16 - swap halves of 16-bit words in place
3049 * @buf: Buffer to swap
3050 * @buf_words: Number of 16-bit words in buffer.
3052 * Swap halves of 16-bit words if needed to convert from
3053 * little-endian byte order to native cpu byte order, or
3057 * Inherited from caller.
3059 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3064 for (i
= 0; i
< buf_words
; i
++)
3065 buf
[i
] = le16_to_cpu(buf
[i
]);
3066 #endif /* __BIG_ENDIAN */
3070 * ata_mmio_data_xfer - Transfer data by MMIO
3071 * @ap: port to read/write
3073 * @buflen: buffer length
3074 * @write_data: read/write
3076 * Transfer data from/to the device data register by MMIO.
3079 * Inherited from caller.
3082 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3083 unsigned int buflen
, int write_data
)
3086 unsigned int words
= buflen
>> 1;
3087 u16
*buf16
= (u16
*) buf
;
3088 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3090 /* Transfer multiple of 2 bytes */
3092 for (i
= 0; i
< words
; i
++)
3093 writew(le16_to_cpu(buf16
[i
]), mmio
);
3095 for (i
= 0; i
< words
; i
++)
3096 buf16
[i
] = cpu_to_le16(readw(mmio
));
3099 /* Transfer trailing 1 byte, if any. */
3100 if (unlikely(buflen
& 0x01)) {
3101 u16 align_buf
[1] = { 0 };
3102 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3105 memcpy(align_buf
, trailing_buf
, 1);
3106 writew(le16_to_cpu(align_buf
[0]), mmio
);
3108 align_buf
[0] = cpu_to_le16(readw(mmio
));
3109 memcpy(trailing_buf
, align_buf
, 1);
3115 * ata_pio_data_xfer - Transfer data by PIO
3116 * @ap: port to read/write
3118 * @buflen: buffer length
3119 * @write_data: read/write
3121 * Transfer data from/to the device data register by PIO.
3124 * Inherited from caller.
3127 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3128 unsigned int buflen
, int write_data
)
3130 unsigned int words
= buflen
>> 1;
3132 /* Transfer multiple of 2 bytes */
3134 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3136 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3138 /* Transfer trailing 1 byte, if any. */
3139 if (unlikely(buflen
& 0x01)) {
3140 u16 align_buf
[1] = { 0 };
3141 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3144 memcpy(align_buf
, trailing_buf
, 1);
3145 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3147 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3148 memcpy(trailing_buf
, align_buf
, 1);
3154 * ata_data_xfer - Transfer data from/to the data register.
3155 * @ap: port to read/write
3157 * @buflen: buffer length
3158 * @do_write: read/write
3160 * Transfer data from/to the device data register.
3163 * Inherited from caller.
3166 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3167 unsigned int buflen
, int do_write
)
3169 /* Make the crap hardware pay the costs not the good stuff */
3170 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3171 unsigned long flags
;
3172 local_irq_save(flags
);
3173 if (ap
->flags
& ATA_FLAG_MMIO
)
3174 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3176 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3177 local_irq_restore(flags
);
3179 if (ap
->flags
& ATA_FLAG_MMIO
)
3180 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3182 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3187 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3188 * @qc: Command on going
3190 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3193 * Inherited from caller.
3196 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3198 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3199 struct scatterlist
*sg
= qc
->__sg
;
3200 struct ata_port
*ap
= qc
->ap
;
3202 unsigned int offset
;
3205 if (qc
->cursect
== (qc
->nsect
- 1))
3206 ap
->hsm_task_state
= HSM_ST_LAST
;
3208 page
= sg
[qc
->cursg
].page
;
3209 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3211 /* get the current page and offset */
3212 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3213 offset
%= PAGE_SIZE
;
3215 buf
= kmap(page
) + offset
;
3220 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3225 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3227 /* do the actual data transfer */
3228 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3229 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3235 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3236 * @qc: Command on going
3237 * @bytes: number of bytes
3239 * Transfer Transfer data from/to the ATAPI device.
3242 * Inherited from caller.
3246 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3248 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3249 struct scatterlist
*sg
= qc
->__sg
;
3250 struct ata_port
*ap
= qc
->ap
;
3253 unsigned int offset
, count
;
3255 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3256 ap
->hsm_task_state
= HSM_ST_LAST
;
3259 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3261 * The end of qc->sg is reached and the device expects
3262 * more data to transfer. In order not to overrun qc->sg
3263 * and fulfill length specified in the byte count register,
3264 * - for read case, discard trailing data from the device
3265 * - for write case, padding zero data to the device
3267 u16 pad_buf
[1] = { 0 };
3268 unsigned int words
= bytes
>> 1;
3271 if (words
) /* warning if bytes > 1 */
3272 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3275 for (i
= 0; i
< words
; i
++)
3276 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3278 ap
->hsm_task_state
= HSM_ST_LAST
;
3282 sg
= &qc
->__sg
[qc
->cursg
];
3285 offset
= sg
->offset
+ qc
->cursg_ofs
;
3287 /* get the current page and offset */
3288 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3289 offset
%= PAGE_SIZE
;
3291 /* don't overrun current sg */
3292 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3294 /* don't cross page boundaries */
3295 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3297 buf
= kmap(page
) + offset
;
3300 qc
->curbytes
+= count
;
3301 qc
->cursg_ofs
+= count
;
3303 if (qc
->cursg_ofs
== sg
->length
) {
3308 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3310 /* do the actual data transfer */
3311 ata_data_xfer(ap
, buf
, count
, do_write
);
3320 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3321 * @qc: Command on going
3323 * Transfer Transfer data from/to the ATAPI device.
3326 * Inherited from caller.
3329 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3331 struct ata_port
*ap
= qc
->ap
;
3332 struct ata_device
*dev
= qc
->dev
;
3333 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3334 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3336 ap
->ops
->tf_read(ap
, &qc
->tf
);
3337 ireason
= qc
->tf
.nsect
;
3338 bc_lo
= qc
->tf
.lbam
;
3339 bc_hi
= qc
->tf
.lbah
;
3340 bytes
= (bc_hi
<< 8) | bc_lo
;
3342 /* shall be cleared to zero, indicating xfer of data */
3343 if (ireason
& (1 << 0))
3346 /* make sure transfer direction matches expected */
3347 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3348 if (do_write
!= i_write
)
3351 __atapi_pio_bytes(qc
, bytes
);
3356 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3357 ap
->id
, dev
->devno
);
3358 qc
->err_mask
|= AC_ERR_HSM
;
3359 ap
->hsm_task_state
= HSM_ST_ERR
;
3363 * ata_pio_block - start PIO on a block
3364 * @ap: the target ata_port
3367 * None. (executing in kernel thread context)
3370 static void ata_pio_block(struct ata_port
*ap
)
3372 struct ata_queued_cmd
*qc
;
3376 * This is purely heuristic. This is a fast path.
3377 * Sometimes when we enter, BSY will be cleared in
3378 * a chk-status or two. If not, the drive is probably seeking
3379 * or something. Snooze for a couple msecs, then
3380 * chk-status again. If still busy, fall back to
3381 * HSM_ST_POLL state.
3383 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3384 if (status
& ATA_BUSY
) {
3386 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3387 if (status
& ATA_BUSY
) {
3388 ap
->hsm_task_state
= HSM_ST_POLL
;
3389 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3394 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3395 WARN_ON(qc
== NULL
);
3398 if (status
& (ATA_ERR
| ATA_DF
)) {
3399 qc
->err_mask
|= AC_ERR_DEV
;
3400 ap
->hsm_task_state
= HSM_ST_ERR
;
3404 /* transfer data if any */
3405 if (is_atapi_taskfile(&qc
->tf
)) {
3406 /* DRQ=0 means no more data to transfer */
3407 if ((status
& ATA_DRQ
) == 0) {
3408 ap
->hsm_task_state
= HSM_ST_LAST
;
3412 atapi_pio_bytes(qc
);
3414 /* handle BSY=0, DRQ=0 as error */
3415 if ((status
& ATA_DRQ
) == 0) {
3416 qc
->err_mask
|= AC_ERR_HSM
;
3417 ap
->hsm_task_state
= HSM_ST_ERR
;
3425 static void ata_pio_error(struct ata_port
*ap
)
3427 struct ata_queued_cmd
*qc
;
3429 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3430 WARN_ON(qc
== NULL
);
3432 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3433 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3435 /* make sure qc->err_mask is available to
3436 * know what's wrong and recover
3438 WARN_ON(qc
->err_mask
== 0);
3440 ap
->hsm_task_state
= HSM_ST_IDLE
;
3442 ata_poll_qc_complete(qc
);
3445 static void ata_pio_task(void *_data
)
3447 struct ata_port
*ap
= _data
;
3448 unsigned long timeout
;
3455 switch (ap
->hsm_task_state
) {
3464 qc_completed
= ata_pio_complete(ap
);
3468 case HSM_ST_LAST_POLL
:
3469 timeout
= ata_pio_poll(ap
);
3479 ata_queue_delayed_pio_task(ap
, timeout
);
3480 else if (!qc_completed
)
3485 * ata_qc_timeout - Handle timeout of queued command
3486 * @qc: Command that timed out
3488 * Some part of the kernel (currently, only the SCSI layer)
3489 * has noticed that the active command on port @ap has not
3490 * completed after a specified length of time. Handle this
3491 * condition by disabling DMA (if necessary) and completing
3492 * transactions, with error if necessary.
3494 * This also handles the case of the "lost interrupt", where
3495 * for some reason (possibly hardware bug, possibly driver bug)
3496 * an interrupt was not delivered to the driver, even though the
3497 * transaction completed successfully.
3500 * Inherited from SCSI layer (none, can sleep)
3503 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3505 struct ata_port
*ap
= qc
->ap
;
3506 struct ata_host_set
*host_set
= ap
->host_set
;
3507 u8 host_stat
= 0, drv_stat
;
3508 unsigned long flags
;
3512 ata_flush_pio_tasks(ap
);
3513 ap
->hsm_task_state
= HSM_ST_IDLE
;
3515 spin_lock_irqsave(&host_set
->lock
, flags
);
3517 switch (qc
->tf
.protocol
) {
3520 case ATA_PROT_ATAPI_DMA
:
3521 host_stat
= ap
->ops
->bmdma_status(ap
);
3523 /* before we do anything else, clear DMA-Start bit */
3524 ap
->ops
->bmdma_stop(qc
);
3530 drv_stat
= ata_chk_status(ap
);
3532 /* ack bmdma irq events */
3533 ap
->ops
->irq_clear(ap
);
3535 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3536 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3538 /* complete taskfile transaction */
3539 qc
->err_mask
|= ac_err_mask(drv_stat
);
3543 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3545 ata_eh_qc_complete(qc
);
3551 * ata_eng_timeout - Handle timeout of queued command
3552 * @ap: Port on which timed-out command is active
3554 * Some part of the kernel (currently, only the SCSI layer)
3555 * has noticed that the active command on port @ap has not
3556 * completed after a specified length of time. Handle this
3557 * condition by disabling DMA (if necessary) and completing
3558 * transactions, with error if necessary.
3560 * This also handles the case of the "lost interrupt", where
3561 * for some reason (possibly hardware bug, possibly driver bug)
3562 * an interrupt was not delivered to the driver, even though the
3563 * transaction completed successfully.
3566 * Inherited from SCSI layer (none, can sleep)
3569 void ata_eng_timeout(struct ata_port
*ap
)
3573 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3579 * ata_qc_new - Request an available ATA command, for queueing
3580 * @ap: Port associated with device @dev
3581 * @dev: Device from whom we request an available command structure
3587 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3589 struct ata_queued_cmd
*qc
= NULL
;
3592 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3593 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3594 qc
= ata_qc_from_tag(ap
, i
);
3605 * ata_qc_new_init - Request an available ATA command, and initialize it
3606 * @ap: Port associated with device @dev
3607 * @dev: Device from whom we request an available command structure
3613 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3614 struct ata_device
*dev
)
3616 struct ata_queued_cmd
*qc
;
3618 qc
= ata_qc_new(ap
);
3631 * ata_qc_free - free unused ata_queued_cmd
3632 * @qc: Command to complete
3634 * Designed to free unused ata_queued_cmd object
3635 * in case something prevents using it.
3638 * spin_lock_irqsave(host_set lock)
3640 void ata_qc_free(struct ata_queued_cmd
*qc
)
3642 struct ata_port
*ap
= qc
->ap
;
3645 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3649 if (likely(ata_tag_valid(tag
))) {
3650 if (tag
== ap
->active_tag
)
3651 ap
->active_tag
= ATA_TAG_POISON
;
3652 qc
->tag
= ATA_TAG_POISON
;
3653 clear_bit(tag
, &ap
->qactive
);
3657 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3659 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3660 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3662 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3665 /* atapi: mark qc as inactive to prevent the interrupt handler
3666 * from completing the command twice later, before the error handler
3667 * is called. (when rc != 0 and atapi request sense is needed)
3669 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3671 /* call completion callback */
3672 qc
->complete_fn(qc
);
3675 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3677 struct ata_port
*ap
= qc
->ap
;
3679 switch (qc
->tf
.protocol
) {
3681 case ATA_PROT_ATAPI_DMA
:
3684 case ATA_PROT_ATAPI
:
3686 case ATA_PROT_PIO_MULT
:
3687 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3700 * ata_qc_issue - issue taskfile to device
3701 * @qc: command to issue to device
3703 * Prepare an ATA command to submission to device.
3704 * This includes mapping the data into a DMA-able
3705 * area, filling in the S/G table, and finally
3706 * writing the taskfile to hardware, starting the command.
3709 * spin_lock_irqsave(host_set lock)
3712 * Zero on success, AC_ERR_* mask on failure
3715 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3717 struct ata_port
*ap
= qc
->ap
;
3719 if (ata_should_dma_map(qc
)) {
3720 if (qc
->flags
& ATA_QCFLAG_SG
) {
3721 if (ata_sg_setup(qc
))
3723 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3724 if (ata_sg_setup_one(qc
))
3728 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3731 ap
->ops
->qc_prep(qc
);
3733 qc
->ap
->active_tag
= qc
->tag
;
3734 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3736 return ap
->ops
->qc_issue(qc
);
3739 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3740 return AC_ERR_SYSTEM
;
3745 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3746 * @qc: command to issue to device
3748 * Using various libata functions and hooks, this function
3749 * starts an ATA command. ATA commands are grouped into
3750 * classes called "protocols", and issuing each type of protocol
3751 * is slightly different.
3753 * May be used as the qc_issue() entry in ata_port_operations.
3756 * spin_lock_irqsave(host_set lock)
3759 * Zero on success, AC_ERR_* mask on failure
3762 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3764 struct ata_port
*ap
= qc
->ap
;
3766 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3768 switch (qc
->tf
.protocol
) {
3769 case ATA_PROT_NODATA
:
3770 ata_tf_to_host(ap
, &qc
->tf
);
3774 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3775 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3776 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3779 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3780 ata_qc_set_polling(qc
);
3781 ata_tf_to_host(ap
, &qc
->tf
);
3782 ap
->hsm_task_state
= HSM_ST
;
3783 ata_queue_pio_task(ap
);
3786 case ATA_PROT_ATAPI
:
3787 ata_qc_set_polling(qc
);
3788 ata_tf_to_host(ap
, &qc
->tf
);
3789 ata_queue_packet_task(ap
);
3792 case ATA_PROT_ATAPI_NODATA
:
3793 ap
->flags
|= ATA_FLAG_NOINTR
;
3794 ata_tf_to_host(ap
, &qc
->tf
);
3795 ata_queue_packet_task(ap
);
3798 case ATA_PROT_ATAPI_DMA
:
3799 ap
->flags
|= ATA_FLAG_NOINTR
;
3800 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3801 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3802 ata_queue_packet_task(ap
);
3807 return AC_ERR_SYSTEM
;
3814 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3815 * @qc: Info associated with this ATA transaction.
3818 * spin_lock_irqsave(host_set lock)
3821 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3823 struct ata_port
*ap
= qc
->ap
;
3824 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3826 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3828 /* load PRD table addr. */
3829 mb(); /* make sure PRD table writes are visible to controller */
3830 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3832 /* specify data direction, triple-check start bit is clear */
3833 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3834 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3836 dmactl
|= ATA_DMA_WR
;
3837 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3839 /* issue r/w command */
3840 ap
->ops
->exec_command(ap
, &qc
->tf
);
3844 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3845 * @qc: Info associated with this ATA transaction.
3848 * spin_lock_irqsave(host_set lock)
3851 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3853 struct ata_port
*ap
= qc
->ap
;
3854 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3857 /* start host DMA transaction */
3858 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3859 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3861 /* Strictly, one may wish to issue a readb() here, to
3862 * flush the mmio write. However, control also passes
3863 * to the hardware at this point, and it will interrupt
3864 * us when we are to resume control. So, in effect,
3865 * we don't care when the mmio write flushes.
3866 * Further, a read of the DMA status register _immediately_
3867 * following the write may not be what certain flaky hardware
3868 * is expected, so I think it is best to not add a readb()
3869 * without first all the MMIO ATA cards/mobos.
3870 * Or maybe I'm just being paranoid.
3875 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3876 * @qc: Info associated with this ATA transaction.
3879 * spin_lock_irqsave(host_set lock)
3882 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3884 struct ata_port
*ap
= qc
->ap
;
3885 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3888 /* load PRD table addr. */
3889 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3891 /* specify data direction, triple-check start bit is clear */
3892 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3893 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3895 dmactl
|= ATA_DMA_WR
;
3896 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3898 /* issue r/w command */
3899 ap
->ops
->exec_command(ap
, &qc
->tf
);
3903 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3904 * @qc: Info associated with this ATA transaction.
3907 * spin_lock_irqsave(host_set lock)
3910 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3912 struct ata_port
*ap
= qc
->ap
;
3915 /* start host DMA transaction */
3916 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3917 outb(dmactl
| ATA_DMA_START
,
3918 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3923 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3924 * @qc: Info associated with this ATA transaction.
3926 * Writes the ATA_DMA_START flag to the DMA command register.
3928 * May be used as the bmdma_start() entry in ata_port_operations.
3931 * spin_lock_irqsave(host_set lock)
3933 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3935 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3936 ata_bmdma_start_mmio(qc
);
3938 ata_bmdma_start_pio(qc
);
3943 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3944 * @qc: Info associated with this ATA transaction.
3946 * Writes address of PRD table to device's PRD Table Address
3947 * register, sets the DMA control register, and calls
3948 * ops->exec_command() to start the transfer.
3950 * May be used as the bmdma_setup() entry in ata_port_operations.
3953 * spin_lock_irqsave(host_set lock)
3955 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3957 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3958 ata_bmdma_setup_mmio(qc
);
3960 ata_bmdma_setup_pio(qc
);
3965 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3966 * @ap: Port associated with this ATA transaction.
3968 * Clear interrupt and error flags in DMA status register.
3970 * May be used as the irq_clear() entry in ata_port_operations.
3973 * spin_lock_irqsave(host_set lock)
3976 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3978 if (ap
->flags
& ATA_FLAG_MMIO
) {
3979 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3980 writeb(readb(mmio
), mmio
);
3982 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3983 outb(inb(addr
), addr
);
3990 * ata_bmdma_status - Read PCI IDE BMDMA status
3991 * @ap: Port associated with this ATA transaction.
3993 * Read and return BMDMA status register.
3995 * May be used as the bmdma_status() entry in ata_port_operations.
3998 * spin_lock_irqsave(host_set lock)
4001 u8
ata_bmdma_status(struct ata_port
*ap
)
4004 if (ap
->flags
& ATA_FLAG_MMIO
) {
4005 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4006 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4008 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4014 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4015 * @qc: Command we are ending DMA for
4017 * Clears the ATA_DMA_START flag in the dma control register
4019 * May be used as the bmdma_stop() entry in ata_port_operations.
4022 * spin_lock_irqsave(host_set lock)
4025 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4027 struct ata_port
*ap
= qc
->ap
;
4028 if (ap
->flags
& ATA_FLAG_MMIO
) {
4029 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4031 /* clear start/stop bit */
4032 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4033 mmio
+ ATA_DMA_CMD
);
4035 /* clear start/stop bit */
4036 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4037 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4040 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4041 ata_altstatus(ap
); /* dummy read */
4045 * ata_host_intr - Handle host interrupt for given (port, task)
4046 * @ap: Port on which interrupt arrived (possibly...)
4047 * @qc: Taskfile currently active in engine
4049 * Handle host interrupt for given queued command. Currently,
4050 * only DMA interrupts are handled. All other commands are
4051 * handled via polling with interrupts disabled (nIEN bit).
4054 * spin_lock_irqsave(host_set lock)
4057 * One if interrupt was handled, zero if not (shared irq).
4060 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4061 struct ata_queued_cmd
*qc
)
4063 u8 status
, host_stat
;
4065 switch (qc
->tf
.protocol
) {
4068 case ATA_PROT_ATAPI_DMA
:
4069 case ATA_PROT_ATAPI
:
4070 /* check status of DMA engine */
4071 host_stat
= ap
->ops
->bmdma_status(ap
);
4072 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4074 /* if it's not our irq... */
4075 if (!(host_stat
& ATA_DMA_INTR
))
4078 /* before we do anything else, clear DMA-Start bit */
4079 ap
->ops
->bmdma_stop(qc
);
4083 case ATA_PROT_ATAPI_NODATA
:
4084 case ATA_PROT_NODATA
:
4085 /* check altstatus */
4086 status
= ata_altstatus(ap
);
4087 if (status
& ATA_BUSY
)
4090 /* check main status, clearing INTRQ */
4091 status
= ata_chk_status(ap
);
4092 if (unlikely(status
& ATA_BUSY
))
4094 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4095 ap
->id
, qc
->tf
.protocol
, status
);
4097 /* ack bmdma irq events */
4098 ap
->ops
->irq_clear(ap
);
4100 /* complete taskfile transaction */
4101 qc
->err_mask
|= ac_err_mask(status
);
4102 ata_qc_complete(qc
);
4109 return 1; /* irq handled */
4112 ap
->stats
.idle_irq
++;
4115 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4117 ata_irq_ack(ap
, 0); /* debug trap */
4118 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4121 return 0; /* irq not handled */
4125 * ata_interrupt - Default ATA host interrupt handler
4126 * @irq: irq line (unused)
4127 * @dev_instance: pointer to our ata_host_set information structure
4130 * Default interrupt handler for PCI IDE devices. Calls
4131 * ata_host_intr() for each port that is not disabled.
4134 * Obtains host_set lock during operation.
4137 * IRQ_NONE or IRQ_HANDLED.
4140 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4142 struct ata_host_set
*host_set
= dev_instance
;
4144 unsigned int handled
= 0;
4145 unsigned long flags
;
4147 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4148 spin_lock_irqsave(&host_set
->lock
, flags
);
4150 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4151 struct ata_port
*ap
;
4153 ap
= host_set
->ports
[i
];
4155 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4156 struct ata_queued_cmd
*qc
;
4158 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4159 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4160 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4161 handled
|= ata_host_intr(ap
, qc
);
4165 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4167 return IRQ_RETVAL(handled
);
4171 * atapi_packet_task - Write CDB bytes to hardware
4172 * @_data: Port to which ATAPI device is attached.
4174 * When device has indicated its readiness to accept
4175 * a CDB, this function is called. Send the CDB.
4176 * If DMA is to be performed, exit immediately.
4177 * Otherwise, we are in polling mode, so poll
4178 * status under operation succeeds or fails.
4181 * Kernel thread context (may sleep)
4184 static void atapi_packet_task(void *_data
)
4186 struct ata_port
*ap
= _data
;
4187 struct ata_queued_cmd
*qc
;
4190 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4191 WARN_ON(qc
== NULL
);
4192 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4194 /* sleep-wait for BSY to clear */
4195 DPRINTK("busy wait\n");
4196 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4197 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4201 /* make sure DRQ is set */
4202 status
= ata_chk_status(ap
);
4203 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4204 qc
->err_mask
|= AC_ERR_HSM
;
4209 DPRINTK("send cdb\n");
4210 WARN_ON(qc
->dev
->cdb_len
< 12);
4212 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4213 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4214 unsigned long flags
;
4216 /* Once we're done issuing command and kicking bmdma,
4217 * irq handler takes over. To not lose irq, we need
4218 * to clear NOINTR flag before sending cdb, but
4219 * interrupt handler shouldn't be invoked before we're
4220 * finished. Hence, the following locking.
4222 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4223 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4224 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4225 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4226 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4227 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4229 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4231 /* PIO commands are handled by polling */
4232 ap
->hsm_task_state
= HSM_ST
;
4233 ata_queue_pio_task(ap
);
4239 ata_poll_qc_complete(qc
);
4244 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4245 * without filling any other registers
4247 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4250 struct ata_taskfile tf
;
4253 ata_tf_init(ap
, &tf
, dev
->devno
);
4256 tf
.flags
|= ATA_TFLAG_DEVICE
;
4257 tf
.protocol
= ATA_PROT_NODATA
;
4259 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4261 printk(KERN_ERR
"%s: ata command failed: %d\n",
4267 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4271 if (!ata_try_flush_cache(dev
))
4274 if (ata_id_has_flush_ext(dev
->id
))
4275 cmd
= ATA_CMD_FLUSH_EXT
;
4277 cmd
= ATA_CMD_FLUSH
;
4279 return ata_do_simple_cmd(ap
, dev
, cmd
);
4282 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4284 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4287 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4289 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4293 * ata_device_resume - wakeup a previously suspended devices
4294 * @ap: port the device is connected to
4295 * @dev: the device to resume
4297 * Kick the drive back into action, by sending it an idle immediate
4298 * command and making sure its transfer mode matches between drive
4302 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4304 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4305 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4308 if (!ata_dev_present(dev
))
4310 if (dev
->class == ATA_DEV_ATA
)
4311 ata_start_drive(ap
, dev
);
4317 * ata_device_suspend - prepare a device for suspend
4318 * @ap: port the device is connected to
4319 * @dev: the device to suspend
4321 * Flush the cache on the drive, if appropriate, then issue a
4322 * standbynow command.
4324 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4326 if (!ata_dev_present(dev
))
4328 if (dev
->class == ATA_DEV_ATA
)
4329 ata_flush_cache(ap
, dev
);
4331 ata_standby_drive(ap
, dev
);
4332 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4337 * ata_port_start - Set port up for dma.
4338 * @ap: Port to initialize
4340 * Called just after data structures for each port are
4341 * initialized. Allocates space for PRD table.
4343 * May be used as the port_start() entry in ata_port_operations.
4346 * Inherited from caller.
4349 int ata_port_start (struct ata_port
*ap
)
4351 struct device
*dev
= ap
->host_set
->dev
;
4354 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4358 rc
= ata_pad_alloc(ap
, dev
);
4360 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4364 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4371 * ata_port_stop - Undo ata_port_start()
4372 * @ap: Port to shut down
4374 * Frees the PRD table.
4376 * May be used as the port_stop() entry in ata_port_operations.
4379 * Inherited from caller.
4382 void ata_port_stop (struct ata_port
*ap
)
4384 struct device
*dev
= ap
->host_set
->dev
;
4386 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4387 ata_pad_free(ap
, dev
);
4390 void ata_host_stop (struct ata_host_set
*host_set
)
4392 if (host_set
->mmio_base
)
4393 iounmap(host_set
->mmio_base
);
4398 * ata_host_remove - Unregister SCSI host structure with upper layers
4399 * @ap: Port to unregister
4400 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4403 * Inherited from caller.
4406 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4408 struct Scsi_Host
*sh
= ap
->host
;
4413 scsi_remove_host(sh
);
4415 ap
->ops
->port_stop(ap
);
4419 * ata_host_init - Initialize an ata_port structure
4420 * @ap: Structure to initialize
4421 * @host: associated SCSI mid-layer structure
4422 * @host_set: Collection of hosts to which @ap belongs
4423 * @ent: Probe information provided by low-level driver
4424 * @port_no: Port number associated with this ata_port
4426 * Initialize a new ata_port structure, and its associated
4430 * Inherited from caller.
4433 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4434 struct ata_host_set
*host_set
,
4435 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4441 host
->max_channel
= 1;
4442 host
->unique_id
= ata_unique_id
++;
4443 host
->max_cmd_len
= 12;
4445 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4446 ap
->id
= host
->unique_id
;
4448 ap
->ctl
= ATA_DEVCTL_OBS
;
4449 ap
->host_set
= host_set
;
4450 ap
->port_no
= port_no
;
4452 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4453 ap
->pio_mask
= ent
->pio_mask
;
4454 ap
->mwdma_mask
= ent
->mwdma_mask
;
4455 ap
->udma_mask
= ent
->udma_mask
;
4456 ap
->flags
|= ent
->host_flags
;
4457 ap
->ops
= ent
->port_ops
;
4458 ap
->cbl
= ATA_CBL_NONE
;
4459 ap
->active_tag
= ATA_TAG_POISON
;
4460 ap
->last_ctl
= 0xFF;
4462 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4463 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4464 INIT_LIST_HEAD(&ap
->eh_done_q
);
4466 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4467 ap
->device
[i
].devno
= i
;
4470 ap
->stats
.unhandled_irq
= 1;
4471 ap
->stats
.idle_irq
= 1;
4474 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4478 * ata_host_add - Attach low-level ATA driver to system
4479 * @ent: Information provided by low-level driver
4480 * @host_set: Collections of ports to which we add
4481 * @port_no: Port number associated with this host
4483 * Attach low-level ATA driver to system.
4486 * PCI/etc. bus probe sem.
4489 * New ata_port on success, for NULL on error.
4492 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4493 struct ata_host_set
*host_set
,
4494 unsigned int port_no
)
4496 struct Scsi_Host
*host
;
4497 struct ata_port
*ap
;
4501 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4505 ap
= (struct ata_port
*) &host
->hostdata
[0];
4507 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4509 rc
= ap
->ops
->port_start(ap
);
4516 scsi_host_put(host
);
4521 * ata_device_add - Register hardware device with ATA and SCSI layers
4522 * @ent: Probe information describing hardware device to be registered
4524 * This function processes the information provided in the probe
4525 * information struct @ent, allocates the necessary ATA and SCSI
4526 * host information structures, initializes them, and registers
4527 * everything with requisite kernel subsystems.
4529 * This function requests irqs, probes the ATA bus, and probes
4533 * PCI/etc. bus probe sem.
4536 * Number of ports registered. Zero on error (no ports registered).
4539 int ata_device_add(const struct ata_probe_ent
*ent
)
4541 unsigned int count
= 0, i
;
4542 struct device
*dev
= ent
->dev
;
4543 struct ata_host_set
*host_set
;
4546 /* alloc a container for our list of ATA ports (buses) */
4547 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4548 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4551 spin_lock_init(&host_set
->lock
);
4553 host_set
->dev
= dev
;
4554 host_set
->n_ports
= ent
->n_ports
;
4555 host_set
->irq
= ent
->irq
;
4556 host_set
->mmio_base
= ent
->mmio_base
;
4557 host_set
->private_data
= ent
->private_data
;
4558 host_set
->ops
= ent
->port_ops
;
4560 /* register each port bound to this device */
4561 for (i
= 0; i
< ent
->n_ports
; i
++) {
4562 struct ata_port
*ap
;
4563 unsigned long xfer_mode_mask
;
4565 ap
= ata_host_add(ent
, host_set
, i
);
4569 host_set
->ports
[i
] = ap
;
4570 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4571 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4572 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4574 /* print per-port info to dmesg */
4575 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4576 "bmdma 0x%lX irq %lu\n",
4578 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4579 ata_mode_string(xfer_mode_mask
),
4580 ap
->ioaddr
.cmd_addr
,
4581 ap
->ioaddr
.ctl_addr
,
4582 ap
->ioaddr
.bmdma_addr
,
4586 host_set
->ops
->irq_clear(ap
);
4593 /* obtain irq, that is shared between channels */
4594 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4595 DRV_NAME
, host_set
))
4598 /* perform each probe synchronously */
4599 DPRINTK("probe begin\n");
4600 for (i
= 0; i
< count
; i
++) {
4601 struct ata_port
*ap
;
4604 ap
= host_set
->ports
[i
];
4606 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4607 rc
= ata_bus_probe(ap
);
4608 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4611 /* FIXME: do something useful here?
4612 * Current libata behavior will
4613 * tear down everything when
4614 * the module is removed
4615 * or the h/w is unplugged.
4619 rc
= scsi_add_host(ap
->host
, dev
);
4621 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4623 /* FIXME: do something useful here */
4624 /* FIXME: handle unconditional calls to
4625 * scsi_scan_host and ata_host_remove, below,
4631 /* probes are done, now scan each port's disk(s) */
4632 DPRINTK("host probe begin\n");
4633 for (i
= 0; i
< count
; i
++) {
4634 struct ata_port
*ap
= host_set
->ports
[i
];
4636 ata_scsi_scan_host(ap
);
4639 dev_set_drvdata(dev
, host_set
);
4641 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4642 return ent
->n_ports
; /* success */
4645 for (i
= 0; i
< count
; i
++) {
4646 ata_host_remove(host_set
->ports
[i
], 1);
4647 scsi_host_put(host_set
->ports
[i
]->host
);
4651 VPRINTK("EXIT, returning 0\n");
4656 * ata_host_set_remove - PCI layer callback for device removal
4657 * @host_set: ATA host set that was removed
4659 * Unregister all objects associated with this host set. Free those
4663 * Inherited from calling layer (may sleep).
4666 void ata_host_set_remove(struct ata_host_set
*host_set
)
4668 struct ata_port
*ap
;
4671 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4672 ap
= host_set
->ports
[i
];
4673 scsi_remove_host(ap
->host
);
4676 free_irq(host_set
->irq
, host_set
);
4678 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4679 ap
= host_set
->ports
[i
];
4681 ata_scsi_release(ap
->host
);
4683 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4684 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4686 if (ioaddr
->cmd_addr
== 0x1f0)
4687 release_region(0x1f0, 8);
4688 else if (ioaddr
->cmd_addr
== 0x170)
4689 release_region(0x170, 8);
4692 scsi_host_put(ap
->host
);
4695 if (host_set
->ops
->host_stop
)
4696 host_set
->ops
->host_stop(host_set
);
4702 * ata_scsi_release - SCSI layer callback hook for host unload
4703 * @host: libata host to be unloaded
4705 * Performs all duties necessary to shut down a libata port...
4706 * Kill port kthread, disable port, and release resources.
4709 * Inherited from SCSI layer.
4715 int ata_scsi_release(struct Scsi_Host
*host
)
4717 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4721 ap
->ops
->port_disable(ap
);
4722 ata_host_remove(ap
, 0);
4729 * ata_std_ports - initialize ioaddr with standard port offsets.
4730 * @ioaddr: IO address structure to be initialized
4732 * Utility function which initializes data_addr, error_addr,
4733 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4734 * device_addr, status_addr, and command_addr to standard offsets
4735 * relative to cmd_addr.
4737 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4740 void ata_std_ports(struct ata_ioports
*ioaddr
)
4742 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4743 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4744 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4745 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4746 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4747 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4748 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4749 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4750 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4751 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4757 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4759 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4761 pci_iounmap(pdev
, host_set
->mmio_base
);
4765 * ata_pci_remove_one - PCI layer callback for device removal
4766 * @pdev: PCI device that was removed
4768 * PCI layer indicates to libata via this hook that
4769 * hot-unplug or module unload event has occurred.
4770 * Handle this by unregistering all objects associated
4771 * with this PCI device. Free those objects. Then finally
4772 * release PCI resources and disable device.
4775 * Inherited from PCI layer (may sleep).
4778 void ata_pci_remove_one (struct pci_dev
*pdev
)
4780 struct device
*dev
= pci_dev_to_dev(pdev
);
4781 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4783 ata_host_set_remove(host_set
);
4784 pci_release_regions(pdev
);
4785 pci_disable_device(pdev
);
4786 dev_set_drvdata(dev
, NULL
);
4789 /* move to PCI subsystem */
4790 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4792 unsigned long tmp
= 0;
4794 switch (bits
->width
) {
4797 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4803 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4809 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4820 return (tmp
== bits
->val
) ? 1 : 0;
4823 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4825 pci_save_state(pdev
);
4826 pci_disable_device(pdev
);
4827 pci_set_power_state(pdev
, PCI_D3hot
);
4831 int ata_pci_device_resume(struct pci_dev
*pdev
)
4833 pci_set_power_state(pdev
, PCI_D0
);
4834 pci_restore_state(pdev
);
4835 pci_enable_device(pdev
);
4836 pci_set_master(pdev
);
4839 #endif /* CONFIG_PCI */
4842 static int __init
ata_init(void)
4844 ata_wq
= create_workqueue("ata");
4848 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4852 static void __exit
ata_exit(void)
4854 destroy_workqueue(ata_wq
);
4857 module_init(ata_init
);
4858 module_exit(ata_exit
);
4860 static unsigned long ratelimit_time
;
4861 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4863 int ata_ratelimit(void)
4866 unsigned long flags
;
4868 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4870 if (time_after(jiffies
, ratelimit_time
)) {
4872 ratelimit_time
= jiffies
+ (HZ
/5);
4876 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4882 * libata is essentially a library of internal helper functions for
4883 * low-level ATA host controller drivers. As such, the API/ABI is
4884 * likely to change as new drivers are added and updated.
4885 * Do not depend on ABI/API stability.
4888 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4889 EXPORT_SYMBOL_GPL(ata_std_ports
);
4890 EXPORT_SYMBOL_GPL(ata_device_add
);
4891 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4892 EXPORT_SYMBOL_GPL(ata_sg_init
);
4893 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4894 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
4895 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4896 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4897 EXPORT_SYMBOL_GPL(ata_tf_load
);
4898 EXPORT_SYMBOL_GPL(ata_tf_read
);
4899 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4900 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4901 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4902 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4903 EXPORT_SYMBOL_GPL(ata_check_status
);
4904 EXPORT_SYMBOL_GPL(ata_altstatus
);
4905 EXPORT_SYMBOL_GPL(ata_exec_command
);
4906 EXPORT_SYMBOL_GPL(ata_port_start
);
4907 EXPORT_SYMBOL_GPL(ata_port_stop
);
4908 EXPORT_SYMBOL_GPL(ata_host_stop
);
4909 EXPORT_SYMBOL_GPL(ata_interrupt
);
4910 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4911 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4912 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4913 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4914 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4915 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4916 EXPORT_SYMBOL_GPL(ata_port_probe
);
4917 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4918 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4919 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4920 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
4921 EXPORT_SYMBOL_GPL(ata_std_softreset
);
4922 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
4923 EXPORT_SYMBOL_GPL(ata_std_postreset
);
4924 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
4925 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
4926 EXPORT_SYMBOL_GPL(ata_port_disable
);
4927 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4928 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
4929 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4930 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4931 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
4932 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4933 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4934 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4935 EXPORT_SYMBOL_GPL(ata_host_intr
);
4936 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4937 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
4938 EXPORT_SYMBOL_GPL(ata_dev_id_c_string
);
4939 EXPORT_SYMBOL_GPL(ata_dev_config
);
4940 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4941 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
4942 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
4944 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
4945 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4946 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4949 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4950 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4951 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4952 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4953 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4954 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
4955 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
4956 #endif /* CONFIG_PCI */
4958 EXPORT_SYMBOL_GPL(ata_device_suspend
);
4959 EXPORT_SYMBOL_GPL(ata_device_resume
);
4960 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
4961 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);