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
);
73 static void ata_pio_error(struct ata_port
*ap
);
75 static unsigned int ata_unique_id
= 1;
76 static struct workqueue_struct
*ata_wq
;
78 int atapi_enabled
= 0;
79 module_param(atapi_enabled
, int, 0444);
80 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION
);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
103 fis
[0] = 0x27; /* Register - Host to Device FIS */
104 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis
[2] = tf
->command
;
107 fis
[3] = tf
->feature
;
114 fis
[8] = tf
->hob_lbal
;
115 fis
[9] = tf
->hob_lbam
;
116 fis
[10] = tf
->hob_lbah
;
117 fis
[11] = tf
->hob_feature
;
120 fis
[13] = tf
->hob_nsect
;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
143 tf
->command
= fis
[2]; /* status */
144 tf
->feature
= fis
[3]; /* error */
151 tf
->hob_lbal
= fis
[8];
152 tf
->hob_lbam
= fis
[9];
153 tf
->hob_lbah
= fis
[10];
156 tf
->hob_nsect
= fis
[13];
159 static const u8 ata_rw_cmds
[] = {
163 ATA_CMD_READ_MULTI_EXT
,
164 ATA_CMD_WRITE_MULTI_EXT
,
168 ATA_CMD_WRITE_MULTI_FUA_EXT
,
172 ATA_CMD_PIO_READ_EXT
,
173 ATA_CMD_PIO_WRITE_EXT
,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
201 struct ata_taskfile
*tf
= &qc
->tf
;
202 struct ata_device
*dev
= qc
->dev
;
205 int index
, fua
, lba48
, write
;
207 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
208 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
209 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
211 if (dev
->flags
& ATA_DFLAG_PIO
) {
212 tf
->protocol
= ATA_PROT_PIO
;
213 index
= dev
->multi_count
? 0 : 8;
214 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
215 /* Unable to use DMA due to host limitation */
216 tf
->protocol
= ATA_PROT_PIO
;
217 index
= dev
->multi_count
? 0 : 8;
219 tf
->protocol
= ATA_PROT_DMA
;
223 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
231 static const char * const xfer_mode_str
[] = {
251 * ata_udma_string - convert UDMA bit offset to string
252 * @mask: mask of bits supported; only highest bit counts.
254 * Determine string which represents the highest speed
255 * (highest bit in @udma_mask).
261 * Constant C string representing highest speed listed in
262 * @udma_mask, or the constant C string "<n/a>".
265 static const char *ata_mode_string(unsigned int mask
)
269 for (i
= 7; i
>= 0; i
--)
272 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
275 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
282 return xfer_mode_str
[i
];
286 * ata_pio_devchk - PATA device presence detection
287 * @ap: ATA channel to examine
288 * @device: Device to examine (starting at zero)
290 * This technique was originally described in
291 * Hale Landis's ATADRVR (www.ata-atapi.com), and
292 * later found its way into the ATA/ATAPI spec.
294 * Write a pattern to the ATA shadow registers,
295 * and if a device is present, it will respond by
296 * correctly storing and echoing back the
297 * ATA shadow register contents.
303 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
306 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
309 ap
->ops
->dev_select(ap
, device
);
311 outb(0x55, ioaddr
->nsect_addr
);
312 outb(0xaa, ioaddr
->lbal_addr
);
314 outb(0xaa, ioaddr
->nsect_addr
);
315 outb(0x55, ioaddr
->lbal_addr
);
317 outb(0x55, ioaddr
->nsect_addr
);
318 outb(0xaa, ioaddr
->lbal_addr
);
320 nsect
= inb(ioaddr
->nsect_addr
);
321 lbal
= inb(ioaddr
->lbal_addr
);
323 if ((nsect
== 0x55) && (lbal
== 0xaa))
324 return 1; /* we found a device */
326 return 0; /* nothing found */
330 * ata_mmio_devchk - PATA device presence detection
331 * @ap: ATA channel to examine
332 * @device: Device to examine (starting at zero)
334 * This technique was originally described in
335 * Hale Landis's ATADRVR (www.ata-atapi.com), and
336 * later found its way into the ATA/ATAPI spec.
338 * Write a pattern to the ATA shadow registers,
339 * and if a device is present, it will respond by
340 * correctly storing and echoing back the
341 * ATA shadow register contents.
347 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
350 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
353 ap
->ops
->dev_select(ap
, device
);
355 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
356 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
358 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
359 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
361 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
362 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
364 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
365 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
367 if ((nsect
== 0x55) && (lbal
== 0xaa))
368 return 1; /* we found a device */
370 return 0; /* nothing found */
374 * ata_devchk - PATA device presence detection
375 * @ap: ATA channel to examine
376 * @device: Device to examine (starting at zero)
378 * Dispatch ATA device presence detection, depending
379 * on whether we are using PIO or MMIO to talk to the
380 * ATA shadow registers.
386 static unsigned int ata_devchk(struct ata_port
*ap
,
389 if (ap
->flags
& ATA_FLAG_MMIO
)
390 return ata_mmio_devchk(ap
, device
);
391 return ata_pio_devchk(ap
, device
);
395 * ata_dev_classify - determine device type based on ATA-spec signature
396 * @tf: ATA taskfile register set for device to be identified
398 * Determine from taskfile register contents whether a device is
399 * ATA or ATAPI, as per "Signature and persistence" section
400 * of ATA/PI spec (volume 1, sect 5.14).
406 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
407 * the event of failure.
410 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
412 /* Apple's open source Darwin code hints that some devices only
413 * put a proper signature into the LBA mid/high registers,
414 * So, we only check those. It's sufficient for uniqueness.
417 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
418 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
419 DPRINTK("found ATA device by sig\n");
423 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
424 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
425 DPRINTK("found ATAPI device by sig\n");
426 return ATA_DEV_ATAPI
;
429 DPRINTK("unknown device\n");
430 return ATA_DEV_UNKNOWN
;
434 * ata_dev_try_classify - Parse returned ATA device signature
435 * @ap: ATA channel to examine
436 * @device: Device to examine (starting at zero)
437 * @r_err: Value of error register on completion
439 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
440 * an ATA/ATAPI-defined set of values is placed in the ATA
441 * shadow registers, indicating the results of device detection
444 * Select the ATA device, and read the values from the ATA shadow
445 * registers. Then parse according to the Error register value,
446 * and the spec-defined values examined by ata_dev_classify().
452 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
456 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
458 struct ata_taskfile tf
;
462 ap
->ops
->dev_select(ap
, device
);
464 memset(&tf
, 0, sizeof(tf
));
466 ap
->ops
->tf_read(ap
, &tf
);
471 /* see if device passed diags */
474 else if ((device
== 0) && (err
== 0x81))
479 /* determine if device is ATA or ATAPI */
480 class = ata_dev_classify(&tf
);
482 if (class == ATA_DEV_UNKNOWN
)
484 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
490 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
491 * @id: IDENTIFY DEVICE results we will examine
492 * @s: string into which data is output
493 * @ofs: offset into identify device page
494 * @len: length of string to return. must be an even number.
496 * The strings in the IDENTIFY DEVICE page are broken up into
497 * 16-bit chunks. Run through the string, and output each
498 * 8-bit chunk linearly, regardless of platform.
504 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
505 unsigned int ofs
, unsigned int len
)
524 * ata_dev_id_c_string - Convert IDENTIFY DEVICE page into C string
525 * @id: IDENTIFY DEVICE results we will examine
526 * @s: string into which data is output
527 * @ofs: offset into identify device page
528 * @len: length of string to return. must be an odd number.
530 * This function is identical to ata_dev_id_string except that it
531 * trims trailing spaces and terminates the resulting string with
532 * null. @len must be actual maximum length (even number) + 1.
537 void ata_dev_id_c_string(const u16
*id
, unsigned char *s
,
538 unsigned int ofs
, unsigned int len
)
544 ata_dev_id_string(id
, s
, ofs
, len
- 1);
546 p
= s
+ strnlen(s
, len
- 1);
547 while (p
> s
&& p
[-1] == ' ')
552 static u64
ata_id_n_sectors(const u16
*id
)
554 if (ata_id_has_lba(id
)) {
555 if (ata_id_has_lba48(id
))
556 return ata_id_u64(id
, 100);
558 return ata_id_u32(id
, 60);
560 if (ata_id_current_chs_valid(id
))
561 return ata_id_u32(id
, 57);
563 return id
[1] * id
[3] * id
[6];
568 * ata_noop_dev_select - Select device 0/1 on ATA bus
569 * @ap: ATA channel to manipulate
570 * @device: ATA device (numbered from zero) to select
572 * This function performs no actual function.
574 * May be used as the dev_select() entry in ata_port_operations.
579 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
585 * ata_std_dev_select - Select device 0/1 on ATA bus
586 * @ap: ATA channel to manipulate
587 * @device: ATA device (numbered from zero) to select
589 * Use the method defined in the ATA specification to
590 * make either device 0, or device 1, active on the
591 * ATA channel. Works with both PIO and MMIO.
593 * May be used as the dev_select() entry in ata_port_operations.
599 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
604 tmp
= ATA_DEVICE_OBS
;
606 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
608 if (ap
->flags
& ATA_FLAG_MMIO
) {
609 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
611 outb(tmp
, ap
->ioaddr
.device_addr
);
613 ata_pause(ap
); /* needed; also flushes, for mmio */
617 * ata_dev_select - Select device 0/1 on ATA bus
618 * @ap: ATA channel to manipulate
619 * @device: ATA device (numbered from zero) to select
620 * @wait: non-zero to wait for Status register BSY bit to clear
621 * @can_sleep: non-zero if context allows sleeping
623 * Use the method defined in the ATA specification to
624 * make either device 0, or device 1, active on the
627 * This is a high-level version of ata_std_dev_select(),
628 * which additionally provides the services of inserting
629 * the proper pauses and status polling, where needed.
635 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
636 unsigned int wait
, unsigned int can_sleep
)
638 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
639 ap
->id
, device
, wait
);
644 ap
->ops
->dev_select(ap
, device
);
647 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
654 * ata_dump_id - IDENTIFY DEVICE info debugging output
655 * @id: IDENTIFY DEVICE page to dump
657 * Dump selected 16-bit words from the given IDENTIFY DEVICE
664 static inline void ata_dump_id(const u16
*id
)
666 DPRINTK("49==0x%04x "
676 DPRINTK("80==0x%04x "
686 DPRINTK("88==0x%04x "
693 * Compute the PIO modes available for this device. This is not as
694 * trivial as it seems if we must consider early devices correctly.
696 * FIXME: pre IDE drive timing (do we care ?).
699 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
703 /* Usual case. Word 53 indicates word 64 is valid */
704 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
705 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
711 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
712 number for the maximum. Turn it into a mask and return it */
713 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
715 /* But wait.. there's more. Design your standards by committee and
716 you too can get a free iordy field to process. However its the
717 speeds not the modes that are supported... Note drivers using the
718 timing API will get this right anyway */
722 ata_queue_pio_task(struct ata_port
*ap
)
724 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
725 queue_work(ata_wq
, &ap
->pio_task
);
729 ata_queue_delayed_pio_task(struct ata_port
*ap
, unsigned long delay
)
731 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
732 queue_delayed_work(ata_wq
, &ap
->pio_task
, delay
);
736 * ata_flush_pio_tasks - Flush pio_task
737 * @ap: the target ata_port
739 * After this function completes, pio_task is
740 * guranteed not to be running or scheduled.
743 * Kernel thread context (may sleep)
746 static void ata_flush_pio_tasks(struct ata_port
*ap
)
753 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
754 ap
->flags
|= ATA_FLAG_FLUSH_PIO_TASK
;
755 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
757 DPRINTK("flush #1\n");
758 flush_workqueue(ata_wq
);
761 * At this point, if a task is running, it's guaranteed to see
762 * the FLUSH flag; thus, it will never queue pio tasks again.
765 tmp
|= cancel_delayed_work(&ap
->pio_task
);
767 DPRINTK("flush #2\n");
768 flush_workqueue(ata_wq
);
771 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
772 ap
->flags
&= ~ATA_FLAG_FLUSH_PIO_TASK
;
773 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
778 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
780 struct completion
*waiting
= qc
->private_data
;
782 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
787 * ata_exec_internal - execute libata internal command
788 * @ap: Port to which the command is sent
789 * @dev: Device to which the command is sent
790 * @tf: Taskfile registers for the command and the result
791 * @dma_dir: Data tranfer direction of the command
792 * @buf: Data buffer of the command
793 * @buflen: Length of data buffer
795 * Executes libata internal command with timeout. @tf contains
796 * command on entry and result on return. Timeout and error
797 * conditions are reported via return value. No recovery action
798 * is taken after a command times out. It's caller's duty to
799 * clean up after timeout.
802 * None. Should be called with kernel context, might sleep.
806 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
807 struct ata_taskfile
*tf
,
808 int dma_dir
, void *buf
, unsigned int buflen
)
810 u8 command
= tf
->command
;
811 struct ata_queued_cmd
*qc
;
812 DECLARE_COMPLETION(wait
);
814 unsigned int err_mask
;
816 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
818 qc
= ata_qc_new_init(ap
, dev
);
822 qc
->dma_dir
= dma_dir
;
823 if (dma_dir
!= DMA_NONE
) {
824 ata_sg_init_one(qc
, buf
, buflen
);
825 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
828 qc
->private_data
= &wait
;
829 qc
->complete_fn
= ata_qc_complete_internal
;
831 qc
->err_mask
= ata_qc_issue(qc
);
835 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
837 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
838 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
840 /* We're racing with irq here. If we lose, the
841 * following test prevents us from completing the qc
842 * again. If completion irq occurs after here but
843 * before the caller cleans up, it will result in a
844 * spurious interrupt. We can live with that.
846 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
847 qc
->err_mask
= AC_ERR_TIMEOUT
;
849 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
853 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
857 err_mask
= qc
->err_mask
;
865 * ata_pio_need_iordy - check if iordy needed
868 * Check if the current speed of the device requires IORDY. Used
869 * by various controllers for chip configuration.
872 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
875 int speed
= adev
->pio_mode
- XFER_PIO_0
;
882 /* If we have no drive specific rule, then PIO 2 is non IORDY */
884 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
885 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
886 /* Is the speed faster than the drive allows non IORDY ? */
888 /* This is cycle times not frequency - watch the logic! */
889 if (pio
> 240) /* PIO2 is 240nS per cycle */
898 * ata_dev_identify - obtain IDENTIFY x DEVICE page
899 * @ap: port on which device we wish to probe resides
900 * @device: device bus address, starting at zero
902 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
903 * command, and read back the 512-byte device information page.
904 * The device information page is fed to us via the standard
905 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
906 * using standard PIO-IN paths)
908 * After reading the device information page, we use several
909 * bits of information from it to initialize data structures
910 * that will be used during the lifetime of the ata_device.
911 * Other data from the info page is used to disqualify certain
912 * older ATA devices we do not wish to support.
915 * Inherited from caller. Some functions called by this function
916 * obtain the host_set lock.
919 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
921 struct ata_device
*dev
= &ap
->device
[device
];
922 unsigned int major_version
;
923 unsigned long xfer_modes
;
924 unsigned int using_edd
;
925 struct ata_taskfile tf
;
926 unsigned int err_mask
;
929 if (!ata_dev_present(dev
)) {
930 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
935 if (ap
->ops
->probe_reset
||
936 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
941 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
943 WARN_ON(dev
->class != ATA_DEV_ATA
&& dev
->class != ATA_DEV_ATAPI
&&
944 dev
->class != ATA_DEV_NONE
);
946 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
949 ata_tf_init(ap
, &tf
, device
);
951 if (dev
->class == ATA_DEV_ATA
) {
952 tf
.command
= ATA_CMD_ID_ATA
;
953 DPRINTK("do ATA identify\n");
955 tf
.command
= ATA_CMD_ID_ATAPI
;
956 DPRINTK("do ATAPI identify\n");
959 tf
.protocol
= ATA_PROT_PIO
;
961 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
962 dev
->id
, sizeof(dev
->id
));
965 if (err_mask
& ~AC_ERR_DEV
)
969 * arg! EDD works for all test cases, but seems to return
970 * the ATA signature for some ATAPI devices. Until the
971 * reason for this is found and fixed, we fix up the mess
972 * here. If IDENTIFY DEVICE returns command aborted
973 * (as ATAPI devices do), then we issue an
974 * IDENTIFY PACKET DEVICE.
976 * ATA software reset (SRST, the default) does not appear
977 * to have this problem.
979 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
981 if (err
& ATA_ABORTED
) {
982 dev
->class = ATA_DEV_ATAPI
;
989 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
991 /* print device capabilities */
992 printk(KERN_DEBUG
"ata%u: dev %u cfg "
993 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
994 ap
->id
, device
, dev
->id
[49],
995 dev
->id
[82], dev
->id
[83], dev
->id
[84],
996 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1000 * common ATA, ATAPI feature tests
1003 /* we require DMA support (bits 8 of word 49) */
1004 if (!ata_id_has_dma(dev
->id
)) {
1005 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1009 /* quick-n-dirty find max transfer mode; for printk only */
1010 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1012 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1014 xfer_modes
= ata_pio_modes(dev
);
1016 ata_dump_id(dev
->id
);
1018 /* ATA-specific feature tests */
1019 if (dev
->class == ATA_DEV_ATA
) {
1020 dev
->n_sectors
= ata_id_n_sectors(dev
->id
);
1022 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1025 /* get major version */
1026 major_version
= ata_id_major_version(dev
->id
);
1029 * The exact sequence expected by certain pre-ATA4 drives is:
1032 * INITIALIZE DEVICE PARAMETERS
1034 * Some drives were very specific about that exact sequence.
1036 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1037 ata_dev_init_params(ap
, dev
);
1039 /* current CHS translation info (id[53-58]) might be
1040 * changed. reread the identify device info.
1042 ata_dev_reread_id(ap
, dev
);
1045 if (ata_id_has_lba(dev
->id
)) {
1046 dev
->flags
|= ATA_DFLAG_LBA
;
1048 if (ata_id_has_lba48(dev
->id
))
1049 dev
->flags
|= ATA_DFLAG_LBA48
;
1051 /* print device info to dmesg */
1052 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1055 ata_mode_string(xfer_modes
),
1056 (unsigned long long)dev
->n_sectors
,
1057 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1061 /* Default translation */
1062 dev
->cylinders
= dev
->id
[1];
1063 dev
->heads
= dev
->id
[3];
1064 dev
->sectors
= dev
->id
[6];
1066 if (ata_id_current_chs_valid(dev
->id
)) {
1067 /* Current CHS translation is valid. */
1068 dev
->cylinders
= dev
->id
[54];
1069 dev
->heads
= dev
->id
[55];
1070 dev
->sectors
= dev
->id
[56];
1073 /* print device info to dmesg */
1074 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1077 ata_mode_string(xfer_modes
),
1078 (unsigned long long)dev
->n_sectors
,
1079 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1083 if (dev
->id
[59] & 0x100) {
1084 dev
->multi_count
= dev
->id
[59] & 0xff;
1085 DPRINTK("ata%u: dev %u multi count %u\n",
1086 ap
->id
, device
, dev
->multi_count
);
1091 /* ATAPI-specific feature tests */
1092 else if (dev
->class == ATA_DEV_ATAPI
) {
1093 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1096 rc
= atapi_cdb_len(dev
->id
);
1097 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1098 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1101 dev
->cdb_len
= (unsigned int) rc
;
1103 if (ata_id_cdb_intr(dev
->id
))
1104 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1106 /* print device info to dmesg */
1107 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1109 ata_mode_string(xfer_modes
));
1112 ap
->host
->max_cmd_len
= 0;
1113 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1114 ap
->host
->max_cmd_len
= max_t(unsigned int,
1115 ap
->host
->max_cmd_len
,
1116 ap
->device
[i
].cdb_len
);
1118 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1122 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1125 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1126 DPRINTK("EXIT, err\n");
1130 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1131 struct ata_device
*dev
)
1133 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1137 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1144 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1146 /* limit bridge transfers to udma5, 200 sectors */
1147 if (ata_dev_knobble(ap
, &ap
->device
[i
])) {
1148 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1150 ap
->udma_mask
&= ATA_UDMA5
;
1151 ap
->device
[i
].max_sectors
= ATA_MAX_SECTORS
;
1154 if (ap
->ops
->dev_config
)
1155 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1159 * ata_bus_probe - Reset and probe ATA bus
1162 * Master ATA bus probing function. Initiates a hardware-dependent
1163 * bus reset, then attempts to identify any devices found on
1167 * PCI/etc. bus probe sem.
1170 * Zero on success, non-zero on error.
1173 static int ata_bus_probe(struct ata_port
*ap
)
1175 unsigned int i
, found
= 0;
1177 if (ap
->ops
->probe_reset
) {
1178 unsigned int classes
[ATA_MAX_DEVICES
];
1183 rc
= ap
->ops
->probe_reset(ap
, classes
);
1185 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1186 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1187 classes
[i
] = ATA_DEV_NONE
;
1188 ap
->device
[i
].class = classes
[i
];
1191 printk(KERN_ERR
"ata%u: probe reset failed, "
1192 "disabling port\n", ap
->id
);
1193 ata_port_disable(ap
);
1196 ap
->ops
->phy_reset(ap
);
1198 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1201 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1202 ata_dev_identify(ap
, i
);
1203 if (ata_dev_present(&ap
->device
[i
])) {
1205 ata_dev_config(ap
,i
);
1209 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1210 goto err_out_disable
;
1213 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1214 goto err_out_disable
;
1219 ap
->ops
->port_disable(ap
);
1225 * ata_port_probe - Mark port as enabled
1226 * @ap: Port for which we indicate enablement
1228 * Modify @ap data structure such that the system
1229 * thinks that the entire port is enabled.
1231 * LOCKING: host_set lock, or some other form of
1235 void ata_port_probe(struct ata_port
*ap
)
1237 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1241 * sata_print_link_status - Print SATA link status
1242 * @ap: SATA port to printk link status about
1244 * This function prints link speed and status of a SATA link.
1249 static void sata_print_link_status(struct ata_port
*ap
)
1254 if (!ap
->ops
->scr_read
)
1257 sstatus
= scr_read(ap
, SCR_STATUS
);
1259 if (sata_dev_present(ap
)) {
1260 tmp
= (sstatus
>> 4) & 0xf;
1263 else if (tmp
& (1 << 1))
1266 speed
= "<unknown>";
1267 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1268 ap
->id
, speed
, sstatus
);
1270 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1276 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1277 * @ap: SATA port associated with target SATA PHY.
1279 * This function issues commands to standard SATA Sxxx
1280 * PHY registers, to wake up the phy (and device), and
1281 * clear any reset condition.
1284 * PCI/etc. bus probe sem.
1287 void __sata_phy_reset(struct ata_port
*ap
)
1290 unsigned long timeout
= jiffies
+ (HZ
* 5);
1292 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1293 /* issue phy wake/reset */
1294 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1295 /* Couldn't find anything in SATA I/II specs, but
1296 * AHCI-1.1 10.4.2 says at least 1 ms. */
1299 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1301 /* wait for phy to become ready, if necessary */
1304 sstatus
= scr_read(ap
, SCR_STATUS
);
1305 if ((sstatus
& 0xf) != 1)
1307 } while (time_before(jiffies
, timeout
));
1309 /* print link status */
1310 sata_print_link_status(ap
);
1312 /* TODO: phy layer with polling, timeouts, etc. */
1313 if (sata_dev_present(ap
))
1316 ata_port_disable(ap
);
1318 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1321 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1322 ata_port_disable(ap
);
1326 ap
->cbl
= ATA_CBL_SATA
;
1330 * sata_phy_reset - Reset SATA bus.
1331 * @ap: SATA port associated with target SATA PHY.
1333 * This function resets the SATA bus, and then probes
1334 * the bus for devices.
1337 * PCI/etc. bus probe sem.
1340 void sata_phy_reset(struct ata_port
*ap
)
1342 __sata_phy_reset(ap
);
1343 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1349 * ata_port_disable - Disable port.
1350 * @ap: Port to be disabled.
1352 * Modify @ap data structure such that the system
1353 * thinks that the entire port is disabled, and should
1354 * never attempt to probe or communicate with devices
1357 * LOCKING: host_set lock, or some other form of
1361 void ata_port_disable(struct ata_port
*ap
)
1363 ap
->device
[0].class = ATA_DEV_NONE
;
1364 ap
->device
[1].class = ATA_DEV_NONE
;
1365 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1369 * This mode timing computation functionality is ported over from
1370 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1373 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1374 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1375 * for PIO 5, which is a nonstandard extension and UDMA6, which
1376 * is currently supported only by Maxtor drives.
1379 static const struct ata_timing ata_timing
[] = {
1381 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1382 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1383 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1384 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1386 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1387 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1388 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1390 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1392 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1393 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1394 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1396 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1397 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1398 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1400 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1401 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1402 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1404 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1405 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1406 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1408 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1413 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1414 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1416 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1418 q
->setup
= EZ(t
->setup
* 1000, T
);
1419 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1420 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1421 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1422 q
->active
= EZ(t
->active
* 1000, T
);
1423 q
->recover
= EZ(t
->recover
* 1000, T
);
1424 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1425 q
->udma
= EZ(t
->udma
* 1000, UT
);
1428 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1429 struct ata_timing
*m
, unsigned int what
)
1431 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1432 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1433 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1434 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1435 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1436 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1437 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1438 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1441 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1443 const struct ata_timing
*t
;
1445 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1446 if (t
->mode
== 0xFF)
1451 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1452 struct ata_timing
*t
, int T
, int UT
)
1454 const struct ata_timing
*s
;
1455 struct ata_timing p
;
1461 if (!(s
= ata_timing_find_mode(speed
)))
1464 memcpy(t
, s
, sizeof(*s
));
1467 * If the drive is an EIDE drive, it can tell us it needs extended
1468 * PIO/MW_DMA cycle timing.
1471 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1472 memset(&p
, 0, sizeof(p
));
1473 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1474 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1475 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1476 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1477 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1479 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1483 * Convert the timing to bus clock counts.
1486 ata_timing_quantize(t
, t
, T
, UT
);
1489 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1490 * S.M.A.R.T * and some other commands. We have to ensure that the
1491 * DMA cycle timing is slower/equal than the fastest PIO timing.
1494 if (speed
> XFER_PIO_4
) {
1495 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1496 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1500 * Lengthen active & recovery time so that cycle time is correct.
1503 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1504 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1505 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1508 if (t
->active
+ t
->recover
< t
->cycle
) {
1509 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1510 t
->recover
= t
->cycle
- t
->active
;
1516 static const struct {
1519 } xfer_mode_classes
[] = {
1520 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1521 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1522 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1525 static u8
base_from_shift(unsigned int shift
)
1529 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1530 if (xfer_mode_classes
[i
].shift
== shift
)
1531 return xfer_mode_classes
[i
].base
;
1536 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1541 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1544 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1545 dev
->flags
|= ATA_DFLAG_PIO
;
1547 ata_dev_set_xfermode(ap
, dev
);
1549 base
= base_from_shift(dev
->xfer_shift
);
1550 ofs
= dev
->xfer_mode
- base
;
1551 idx
= ofs
+ dev
->xfer_shift
;
1552 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1554 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1555 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1557 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1558 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1561 static int ata_host_set_pio(struct ata_port
*ap
)
1567 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1570 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1574 base
= base_from_shift(ATA_SHIFT_PIO
);
1575 xfer_mode
= base
+ x
;
1577 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1578 (int)base
, (int)xfer_mode
, mask
, x
);
1580 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1581 struct ata_device
*dev
= &ap
->device
[i
];
1582 if (ata_dev_present(dev
)) {
1583 dev
->pio_mode
= xfer_mode
;
1584 dev
->xfer_mode
= xfer_mode
;
1585 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1586 if (ap
->ops
->set_piomode
)
1587 ap
->ops
->set_piomode(ap
, dev
);
1594 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1595 unsigned int xfer_shift
)
1599 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1600 struct ata_device
*dev
= &ap
->device
[i
];
1601 if (ata_dev_present(dev
)) {
1602 dev
->dma_mode
= xfer_mode
;
1603 dev
->xfer_mode
= xfer_mode
;
1604 dev
->xfer_shift
= xfer_shift
;
1605 if (ap
->ops
->set_dmamode
)
1606 ap
->ops
->set_dmamode(ap
, dev
);
1612 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1613 * @ap: port on which timings will be programmed
1615 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1618 * PCI/etc. bus probe sem.
1620 static void ata_set_mode(struct ata_port
*ap
)
1622 unsigned int xfer_shift
;
1626 /* step 1: always set host PIO timings */
1627 rc
= ata_host_set_pio(ap
);
1631 /* step 2: choose the best data xfer mode */
1632 xfer_mode
= xfer_shift
= 0;
1633 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1637 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1638 if (xfer_shift
!= ATA_SHIFT_PIO
)
1639 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1641 /* step 4: update devices' xfer mode */
1642 ata_dev_set_mode(ap
, &ap
->device
[0]);
1643 ata_dev_set_mode(ap
, &ap
->device
[1]);
1645 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1648 if (ap
->ops
->post_set_mode
)
1649 ap
->ops
->post_set_mode(ap
);
1654 ata_port_disable(ap
);
1658 * ata_tf_to_host - issue ATA taskfile to host controller
1659 * @ap: port to which command is being issued
1660 * @tf: ATA taskfile register set
1662 * Issues ATA taskfile register set to ATA host controller,
1663 * with proper synchronization with interrupt handler and
1667 * spin_lock_irqsave(host_set lock)
1670 static inline void ata_tf_to_host(struct ata_port
*ap
,
1671 const struct ata_taskfile
*tf
)
1673 ap
->ops
->tf_load(ap
, tf
);
1674 ap
->ops
->exec_command(ap
, tf
);
1678 * ata_busy_sleep - sleep until BSY clears, or timeout
1679 * @ap: port containing status register to be polled
1680 * @tmout_pat: impatience timeout
1681 * @tmout: overall timeout
1683 * Sleep until ATA Status register bit BSY clears,
1684 * or a timeout occurs.
1689 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1690 unsigned long tmout_pat
, unsigned long tmout
)
1692 unsigned long timer_start
, timeout
;
1695 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1696 timer_start
= jiffies
;
1697 timeout
= timer_start
+ tmout_pat
;
1698 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1700 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1703 if (status
& ATA_BUSY
)
1704 printk(KERN_WARNING
"ata%u is slow to respond, "
1705 "please be patient\n", ap
->id
);
1707 timeout
= timer_start
+ tmout
;
1708 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1710 status
= ata_chk_status(ap
);
1713 if (status
& ATA_BUSY
) {
1714 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1715 ap
->id
, tmout
/ HZ
);
1722 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1724 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1725 unsigned int dev0
= devmask
& (1 << 0);
1726 unsigned int dev1
= devmask
& (1 << 1);
1727 unsigned long timeout
;
1729 /* if device 0 was found in ata_devchk, wait for its
1733 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1735 /* if device 1 was found in ata_devchk, wait for
1736 * register access, then wait for BSY to clear
1738 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1742 ap
->ops
->dev_select(ap
, 1);
1743 if (ap
->flags
& ATA_FLAG_MMIO
) {
1744 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1745 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1747 nsect
= inb(ioaddr
->nsect_addr
);
1748 lbal
= inb(ioaddr
->lbal_addr
);
1750 if ((nsect
== 1) && (lbal
== 1))
1752 if (time_after(jiffies
, timeout
)) {
1756 msleep(50); /* give drive a breather */
1759 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1761 /* is all this really necessary? */
1762 ap
->ops
->dev_select(ap
, 0);
1764 ap
->ops
->dev_select(ap
, 1);
1766 ap
->ops
->dev_select(ap
, 0);
1770 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1771 * @ap: Port to reset and probe
1773 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1774 * probe the bus. Not often used these days.
1777 * PCI/etc. bus probe sem.
1778 * Obtains host_set lock.
1782 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1784 struct ata_taskfile tf
;
1785 unsigned long flags
;
1787 /* set up execute-device-diag (bus reset) taskfile */
1788 /* also, take interrupts to a known state (disabled) */
1789 DPRINTK("execute-device-diag\n");
1790 ata_tf_init(ap
, &tf
, 0);
1792 tf
.command
= ATA_CMD_EDD
;
1793 tf
.protocol
= ATA_PROT_NODATA
;
1796 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1797 ata_tf_to_host(ap
, &tf
);
1798 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1800 /* spec says at least 2ms. but who knows with those
1801 * crazy ATAPI devices...
1805 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1808 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1809 unsigned int devmask
)
1811 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1813 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1815 /* software reset. causes dev0 to be selected */
1816 if (ap
->flags
& ATA_FLAG_MMIO
) {
1817 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1818 udelay(20); /* FIXME: flush */
1819 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1820 udelay(20); /* FIXME: flush */
1821 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1823 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1825 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1827 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1830 /* spec mandates ">= 2ms" before checking status.
1831 * We wait 150ms, because that was the magic delay used for
1832 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1833 * between when the ATA command register is written, and then
1834 * status is checked. Because waiting for "a while" before
1835 * checking status is fine, post SRST, we perform this magic
1836 * delay here as well.
1840 ata_bus_post_reset(ap
, devmask
);
1846 * ata_bus_reset - reset host port and associated ATA channel
1847 * @ap: port to reset
1849 * This is typically the first time we actually start issuing
1850 * commands to the ATA channel. We wait for BSY to clear, then
1851 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1852 * result. Determine what devices, if any, are on the channel
1853 * by looking at the device 0/1 error register. Look at the signature
1854 * stored in each device's taskfile registers, to determine if
1855 * the device is ATA or ATAPI.
1858 * PCI/etc. bus probe sem.
1859 * Obtains host_set lock.
1862 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1865 void ata_bus_reset(struct ata_port
*ap
)
1867 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1868 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1870 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1872 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1874 /* determine if device 0/1 are present */
1875 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1878 dev0
= ata_devchk(ap
, 0);
1880 dev1
= ata_devchk(ap
, 1);
1884 devmask
|= (1 << 0);
1886 devmask
|= (1 << 1);
1888 /* select device 0 again */
1889 ap
->ops
->dev_select(ap
, 0);
1891 /* issue bus reset */
1892 if (ap
->flags
& ATA_FLAG_SRST
)
1893 rc
= ata_bus_softreset(ap
, devmask
);
1894 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1895 /* set up device control */
1896 if (ap
->flags
& ATA_FLAG_MMIO
)
1897 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1899 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1900 rc
= ata_bus_edd(ap
);
1907 * determine by signature whether we have ATA or ATAPI devices
1909 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1910 if ((slave_possible
) && (err
!= 0x81))
1911 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1913 /* re-enable interrupts */
1914 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1917 /* is double-select really necessary? */
1918 if (ap
->device
[1].class != ATA_DEV_NONE
)
1919 ap
->ops
->dev_select(ap
, 1);
1920 if (ap
->device
[0].class != ATA_DEV_NONE
)
1921 ap
->ops
->dev_select(ap
, 0);
1923 /* if no devices were detected, disable this port */
1924 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1925 (ap
->device
[1].class == ATA_DEV_NONE
))
1928 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
1929 /* set up device control for ATA_FLAG_SATA_RESET */
1930 if (ap
->flags
& ATA_FLAG_MMIO
)
1931 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1933 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1940 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
1941 ap
->ops
->port_disable(ap
);
1946 static int sata_phy_resume(struct ata_port
*ap
)
1948 unsigned long timeout
= jiffies
+ (HZ
* 5);
1951 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1953 /* Wait for phy to become ready, if necessary. */
1956 sstatus
= scr_read(ap
, SCR_STATUS
);
1957 if ((sstatus
& 0xf) != 1)
1959 } while (time_before(jiffies
, timeout
));
1965 * ata_std_probeinit - initialize probing
1966 * @ap: port to be probed
1968 * @ap is about to be probed. Initialize it. This function is
1969 * to be used as standard callback for ata_drive_probe_reset().
1971 * NOTE!!! Do not use this function as probeinit if a low level
1972 * driver implements only hardreset. Just pass NULL as probeinit
1973 * in that case. Using this function is probably okay but doing
1974 * so makes reset sequence different from the original
1975 * ->phy_reset implementation and Jeff nervous. :-P
1977 extern void ata_std_probeinit(struct ata_port
*ap
)
1979 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
1980 sata_phy_resume(ap
);
1981 if (sata_dev_present(ap
))
1982 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1987 * ata_std_softreset - reset host port via ATA SRST
1988 * @ap: port to reset
1989 * @verbose: fail verbosely
1990 * @classes: resulting classes of attached devices
1992 * Reset host port using ATA SRST. This function is to be used
1993 * as standard callback for ata_drive_*_reset() functions.
1996 * Kernel thread context (may sleep)
1999 * 0 on success, -errno otherwise.
2001 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2003 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2004 unsigned int devmask
= 0, err_mask
;
2009 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2010 classes
[0] = ATA_DEV_NONE
;
2014 /* determine if device 0/1 are present */
2015 if (ata_devchk(ap
, 0))
2016 devmask
|= (1 << 0);
2017 if (slave_possible
&& ata_devchk(ap
, 1))
2018 devmask
|= (1 << 1);
2020 /* select device 0 again */
2021 ap
->ops
->dev_select(ap
, 0);
2023 /* issue bus reset */
2024 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2025 err_mask
= ata_bus_softreset(ap
, devmask
);
2028 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2031 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2036 /* determine by signature whether we have ATA or ATAPI devices */
2037 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2038 if (slave_possible
&& err
!= 0x81)
2039 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2042 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2047 * sata_std_hardreset - reset host port via SATA phy reset
2048 * @ap: port to reset
2049 * @verbose: fail verbosely
2050 * @class: resulting class of attached device
2052 * SATA phy-reset host port using DET bits of SControl register.
2053 * This function is to be used as standard callback for
2054 * ata_drive_*_reset().
2057 * Kernel thread context (may sleep)
2060 * 0 on success, -errno otherwise.
2062 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2066 /* Issue phy wake/reset */
2067 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2070 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2071 * 10.4.2 says at least 1 ms.
2075 /* Bring phy back */
2076 sata_phy_resume(ap
);
2078 /* TODO: phy layer with polling, timeouts, etc. */
2079 if (!sata_dev_present(ap
)) {
2080 *class = ATA_DEV_NONE
;
2081 DPRINTK("EXIT, link offline\n");
2085 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2087 printk(KERN_ERR
"ata%u: COMRESET failed "
2088 "(device not ready)\n", ap
->id
);
2090 DPRINTK("EXIT, device not ready\n");
2094 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2096 *class = ata_dev_try_classify(ap
, 0, NULL
);
2098 DPRINTK("EXIT, class=%u\n", *class);
2103 * ata_std_postreset - standard postreset callback
2104 * @ap: the target ata_port
2105 * @classes: classes of attached devices
2107 * This function is invoked after a successful reset. Note that
2108 * the device might have been reset more than once using
2109 * different reset methods before postreset is invoked.
2110 * postreset is also reponsible for setting cable type.
2112 * This function is to be used as standard callback for
2113 * ata_drive_*_reset().
2116 * Kernel thread context (may sleep)
2118 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2122 /* set cable type */
2123 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2124 ap
->cbl
= ATA_CBL_SATA
;
2126 /* print link status */
2127 if (ap
->cbl
== ATA_CBL_SATA
)
2128 sata_print_link_status(ap
);
2130 /* re-enable interrupts */
2131 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2134 /* is double-select really necessary? */
2135 if (classes
[0] != ATA_DEV_NONE
)
2136 ap
->ops
->dev_select(ap
, 1);
2137 if (classes
[1] != ATA_DEV_NONE
)
2138 ap
->ops
->dev_select(ap
, 0);
2140 /* bail out if no device is present */
2141 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2142 DPRINTK("EXIT, no device\n");
2146 /* set up device control */
2147 if (ap
->ioaddr
.ctl_addr
) {
2148 if (ap
->flags
& ATA_FLAG_MMIO
)
2149 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2151 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2158 * ata_std_probe_reset - standard probe reset method
2159 * @ap: prot to perform probe-reset
2160 * @classes: resulting classes of attached devices
2162 * The stock off-the-shelf ->probe_reset method.
2165 * Kernel thread context (may sleep)
2168 * 0 on success, -errno otherwise.
2170 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2172 ata_reset_fn_t hardreset
;
2175 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2176 hardreset
= sata_std_hardreset
;
2178 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2179 ata_std_softreset
, hardreset
,
2180 ata_std_postreset
, classes
);
2183 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2184 ata_postreset_fn_t postreset
,
2185 unsigned int *classes
)
2189 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2190 classes
[i
] = ATA_DEV_UNKNOWN
;
2192 rc
= reset(ap
, 0, classes
);
2196 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2197 * is complete and convert all ATA_DEV_UNKNOWN to
2200 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2201 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2204 if (i
< ATA_MAX_DEVICES
)
2205 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2206 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2207 classes
[i
] = ATA_DEV_NONE
;
2210 postreset(ap
, classes
);
2212 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2216 * ata_drive_probe_reset - Perform probe reset with given methods
2217 * @ap: port to reset
2218 * @probeinit: probeinit method (can be NULL)
2219 * @softreset: softreset method (can be NULL)
2220 * @hardreset: hardreset method (can be NULL)
2221 * @postreset: postreset method (can be NULL)
2222 * @classes: resulting classes of attached devices
2224 * Reset the specified port and classify attached devices using
2225 * given methods. This function prefers softreset but tries all
2226 * possible reset sequences to reset and classify devices. This
2227 * function is intended to be used for constructing ->probe_reset
2228 * callback by low level drivers.
2230 * Reset methods should follow the following rules.
2232 * - Return 0 on sucess, -errno on failure.
2233 * - If classification is supported, fill classes[] with
2234 * recognized class codes.
2235 * - If classification is not supported, leave classes[] alone.
2236 * - If verbose is non-zero, print error message on failure;
2237 * otherwise, shut up.
2240 * Kernel thread context (may sleep)
2243 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2244 * if classification fails, and any error code from reset
2247 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2248 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2249 ata_postreset_fn_t postreset
, unsigned int *classes
)
2257 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2265 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2266 if (rc
== 0 || rc
!= -ENODEV
)
2270 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2275 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2276 const struct ata_device
*dev
)
2278 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2279 ap
->id
, dev
->devno
);
2282 static const char * const ata_dma_blacklist
[] = {
2301 "Toshiba CD-ROM XM-6202B",
2302 "TOSHIBA CD-ROM XM-1702BC",
2304 "E-IDE CD-ROM CR-840",
2307 "SAMSUNG CD-ROM SC-148C",
2308 "SAMSUNG CD-ROM SC",
2310 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2314 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2316 unsigned char model_num
[41];
2319 ata_dev_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2322 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2323 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2329 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2331 const struct ata_device
*master
, *slave
;
2334 master
= &ap
->device
[0];
2335 slave
= &ap
->device
[1];
2337 WARN_ON(!ata_dev_present(master
) && !ata_dev_present(slave
));
2339 if (shift
== ATA_SHIFT_UDMA
) {
2340 mask
= ap
->udma_mask
;
2341 if (ata_dev_present(master
)) {
2342 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2343 if (ata_dma_blacklisted(master
)) {
2345 ata_pr_blacklisted(ap
, master
);
2348 if (ata_dev_present(slave
)) {
2349 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2350 if (ata_dma_blacklisted(slave
)) {
2352 ata_pr_blacklisted(ap
, slave
);
2356 else if (shift
== ATA_SHIFT_MWDMA
) {
2357 mask
= ap
->mwdma_mask
;
2358 if (ata_dev_present(master
)) {
2359 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2360 if (ata_dma_blacklisted(master
)) {
2362 ata_pr_blacklisted(ap
, master
);
2365 if (ata_dev_present(slave
)) {
2366 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2367 if (ata_dma_blacklisted(slave
)) {
2369 ata_pr_blacklisted(ap
, slave
);
2373 else if (shift
== ATA_SHIFT_PIO
) {
2374 mask
= ap
->pio_mask
;
2375 if (ata_dev_present(master
)) {
2376 /* spec doesn't return explicit support for
2377 * PIO0-2, so we fake it
2379 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2384 if (ata_dev_present(slave
)) {
2385 /* spec doesn't return explicit support for
2386 * PIO0-2, so we fake it
2388 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2395 mask
= 0xffffffff; /* shut up compiler warning */
2402 /* find greatest bit */
2403 static int fgb(u32 bitmap
)
2408 for (i
= 0; i
< 32; i
++)
2409 if (bitmap
& (1 << i
))
2416 * ata_choose_xfer_mode - attempt to find best transfer mode
2417 * @ap: Port for which an xfer mode will be selected
2418 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2419 * @xfer_shift_out: (output) bit shift that selects this mode
2421 * Based on host and device capabilities, determine the
2422 * maximum transfer mode that is amenable to all.
2425 * PCI/etc. bus probe sem.
2428 * Zero on success, negative on error.
2431 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2433 unsigned int *xfer_shift_out
)
2435 unsigned int mask
, shift
;
2438 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2439 shift
= xfer_mode_classes
[i
].shift
;
2440 mask
= ata_get_mode_mask(ap
, shift
);
2444 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2445 *xfer_shift_out
= shift
;
2454 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2455 * @ap: Port associated with device @dev
2456 * @dev: Device to which command will be sent
2458 * Issue SET FEATURES - XFER MODE command to device @dev
2462 * PCI/etc. bus probe sem.
2465 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2467 struct ata_taskfile tf
;
2469 /* set up set-features taskfile */
2470 DPRINTK("set features - xfer mode\n");
2472 ata_tf_init(ap
, &tf
, dev
->devno
);
2473 tf
.command
= ATA_CMD_SET_FEATURES
;
2474 tf
.feature
= SETFEATURES_XFER
;
2475 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2476 tf
.protocol
= ATA_PROT_NODATA
;
2477 tf
.nsect
= dev
->xfer_mode
;
2479 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2480 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2482 ata_port_disable(ap
);
2489 * ata_dev_reread_id - Reread the device identify device info
2490 * @ap: port where the device is
2491 * @dev: device to reread the identify device info
2496 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2498 struct ata_taskfile tf
;
2500 ata_tf_init(ap
, &tf
, dev
->devno
);
2502 if (dev
->class == ATA_DEV_ATA
) {
2503 tf
.command
= ATA_CMD_ID_ATA
;
2504 DPRINTK("do ATA identify\n");
2506 tf
.command
= ATA_CMD_ID_ATAPI
;
2507 DPRINTK("do ATAPI identify\n");
2510 tf
.flags
|= ATA_TFLAG_DEVICE
;
2511 tf
.protocol
= ATA_PROT_PIO
;
2513 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2514 dev
->id
, sizeof(dev
->id
)))
2517 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2519 ata_dump_id(dev
->id
);
2525 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2526 ata_port_disable(ap
);
2530 * ata_dev_init_params - Issue INIT DEV PARAMS command
2531 * @ap: Port associated with device @dev
2532 * @dev: Device to which command will be sent
2537 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2539 struct ata_taskfile tf
;
2540 u16 sectors
= dev
->id
[6];
2541 u16 heads
= dev
->id
[3];
2543 /* Number of sectors per track 1-255. Number of heads 1-16 */
2544 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2547 /* set up init dev params taskfile */
2548 DPRINTK("init dev params \n");
2550 ata_tf_init(ap
, &tf
, dev
->devno
);
2551 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2552 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2553 tf
.protocol
= ATA_PROT_NODATA
;
2555 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2557 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2558 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2560 ata_port_disable(ap
);
2567 * ata_sg_clean - Unmap DMA memory associated with command
2568 * @qc: Command containing DMA memory to be released
2570 * Unmap all mapped DMA memory associated with this command.
2573 * spin_lock_irqsave(host_set lock)
2576 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2578 struct ata_port
*ap
= qc
->ap
;
2579 struct scatterlist
*sg
= qc
->__sg
;
2580 int dir
= qc
->dma_dir
;
2581 void *pad_buf
= NULL
;
2583 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2584 WARN_ON(sg
== NULL
);
2586 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2587 WARN_ON(qc
->n_elem
!= 1);
2589 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2591 /* if we padded the buffer out to 32-bit bound, and data
2592 * xfer direction is from-device, we must copy from the
2593 * pad buffer back into the supplied buffer
2595 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2596 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2598 if (qc
->flags
& ATA_QCFLAG_SG
) {
2600 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2601 /* restore last sg */
2602 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2604 struct scatterlist
*psg
= &qc
->pad_sgent
;
2605 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2606 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2607 kunmap_atomic(addr
, KM_IRQ0
);
2610 if (sg_dma_len(&sg
[0]) > 0)
2611 dma_unmap_single(ap
->host_set
->dev
,
2612 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2615 sg
->length
+= qc
->pad_len
;
2617 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2618 pad_buf
, qc
->pad_len
);
2621 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2626 * ata_fill_sg - Fill PCI IDE PRD table
2627 * @qc: Metadata associated with taskfile to be transferred
2629 * Fill PCI IDE PRD (scatter-gather) table with segments
2630 * associated with the current disk command.
2633 * spin_lock_irqsave(host_set lock)
2636 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2638 struct ata_port
*ap
= qc
->ap
;
2639 struct scatterlist
*sg
;
2642 WARN_ON(qc
->__sg
== NULL
);
2643 WARN_ON(qc
->n_elem
== 0);
2646 ata_for_each_sg(sg
, qc
) {
2650 /* determine if physical DMA addr spans 64K boundary.
2651 * Note h/w doesn't support 64-bit, so we unconditionally
2652 * truncate dma_addr_t to u32.
2654 addr
= (u32
) sg_dma_address(sg
);
2655 sg_len
= sg_dma_len(sg
);
2658 offset
= addr
& 0xffff;
2660 if ((offset
+ sg_len
) > 0x10000)
2661 len
= 0x10000 - offset
;
2663 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2664 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2665 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2674 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2677 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2678 * @qc: Metadata associated with taskfile to check
2680 * Allow low-level driver to filter ATA PACKET commands, returning
2681 * a status indicating whether or not it is OK to use DMA for the
2682 * supplied PACKET command.
2685 * spin_lock_irqsave(host_set lock)
2687 * RETURNS: 0 when ATAPI DMA can be used
2690 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2692 struct ata_port
*ap
= qc
->ap
;
2693 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2695 if (ap
->ops
->check_atapi_dma
)
2696 rc
= ap
->ops
->check_atapi_dma(qc
);
2701 * ata_qc_prep - Prepare taskfile for submission
2702 * @qc: Metadata associated with taskfile to be prepared
2704 * Prepare ATA taskfile for submission.
2707 * spin_lock_irqsave(host_set lock)
2709 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2711 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2718 * ata_sg_init_one - Associate command with memory buffer
2719 * @qc: Command to be associated
2720 * @buf: Memory buffer
2721 * @buflen: Length of memory buffer, in bytes.
2723 * Initialize the data-related elements of queued_cmd @qc
2724 * to point to a single memory buffer, @buf of byte length @buflen.
2727 * spin_lock_irqsave(host_set lock)
2730 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2732 struct scatterlist
*sg
;
2734 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2736 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2737 qc
->__sg
= &qc
->sgent
;
2739 qc
->orig_n_elem
= 1;
2743 sg_init_one(sg
, buf
, buflen
);
2747 * ata_sg_init - Associate command with scatter-gather table.
2748 * @qc: Command to be associated
2749 * @sg: Scatter-gather table.
2750 * @n_elem: Number of elements in s/g table.
2752 * Initialize the data-related elements of queued_cmd @qc
2753 * to point to a scatter-gather table @sg, containing @n_elem
2757 * spin_lock_irqsave(host_set lock)
2760 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2761 unsigned int n_elem
)
2763 qc
->flags
|= ATA_QCFLAG_SG
;
2765 qc
->n_elem
= n_elem
;
2766 qc
->orig_n_elem
= n_elem
;
2770 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2771 * @qc: Command with memory buffer to be mapped.
2773 * DMA-map the memory buffer associated with queued_cmd @qc.
2776 * spin_lock_irqsave(host_set lock)
2779 * Zero on success, negative on error.
2782 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2784 struct ata_port
*ap
= qc
->ap
;
2785 int dir
= qc
->dma_dir
;
2786 struct scatterlist
*sg
= qc
->__sg
;
2787 dma_addr_t dma_address
;
2789 /* we must lengthen transfers to end on a 32-bit boundary */
2790 qc
->pad_len
= sg
->length
& 3;
2792 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2793 struct scatterlist
*psg
= &qc
->pad_sgent
;
2795 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2797 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2799 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2800 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2803 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2804 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2806 sg
->length
-= qc
->pad_len
;
2808 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2809 sg
->length
, qc
->pad_len
);
2813 sg_dma_address(sg
) = 0;
2817 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2819 if (dma_mapping_error(dma_address
)) {
2821 sg
->length
+= qc
->pad_len
;
2825 sg_dma_address(sg
) = dma_address
;
2827 sg_dma_len(sg
) = sg
->length
;
2829 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2830 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2836 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2837 * @qc: Command with scatter-gather table to be mapped.
2839 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2842 * spin_lock_irqsave(host_set lock)
2845 * Zero on success, negative on error.
2849 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2851 struct ata_port
*ap
= qc
->ap
;
2852 struct scatterlist
*sg
= qc
->__sg
;
2853 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2854 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2856 VPRINTK("ENTER, ata%u\n", ap
->id
);
2857 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
2859 /* we must lengthen transfers to end on a 32-bit boundary */
2860 qc
->pad_len
= lsg
->length
& 3;
2862 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2863 struct scatterlist
*psg
= &qc
->pad_sgent
;
2864 unsigned int offset
;
2866 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2868 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2871 * psg->page/offset are used to copy to-be-written
2872 * data in this function or read data in ata_sg_clean.
2874 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2875 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2876 psg
->offset
= offset_in_page(offset
);
2878 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2879 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2880 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2881 kunmap_atomic(addr
, KM_IRQ0
);
2884 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2885 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2887 lsg
->length
-= qc
->pad_len
;
2888 if (lsg
->length
== 0)
2891 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2892 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2895 pre_n_elem
= qc
->n_elem
;
2896 if (trim_sg
&& pre_n_elem
)
2905 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2907 /* restore last sg */
2908 lsg
->length
+= qc
->pad_len
;
2912 DPRINTK("%d sg elements mapped\n", n_elem
);
2915 qc
->n_elem
= n_elem
;
2921 * ata_poll_qc_complete - turn irq back on and finish qc
2922 * @qc: Command to complete
2923 * @err_mask: ATA status register content
2926 * None. (grabs host lock)
2929 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2931 struct ata_port
*ap
= qc
->ap
;
2932 unsigned long flags
;
2934 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
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 * Zero if qc completed.
3001 * Non-zero if has next.
3004 static int ata_pio_complete (struct ata_port
*ap
)
3006 struct ata_queued_cmd
*qc
;
3010 * This is purely heuristic. This is a fast path. Sometimes when
3011 * we enter, BSY will be cleared in a chk-status or two. If not,
3012 * the drive is probably seeking or something. Snooze for a couple
3013 * msecs, then chk-status again. If still busy, fall back to
3014 * HSM_ST_LAST_POLL state.
3016 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3017 if (drv_stat
& ATA_BUSY
) {
3019 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3020 if (drv_stat
& ATA_BUSY
) {
3021 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3022 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3027 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3028 WARN_ON(qc
== NULL
);
3030 drv_stat
= ata_wait_idle(ap
);
3031 if (!ata_ok(drv_stat
)) {
3032 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3033 ap
->hsm_task_state
= HSM_ST_ERR
;
3037 ap
->hsm_task_state
= HSM_ST_IDLE
;
3039 WARN_ON(qc
->err_mask
);
3040 ata_poll_qc_complete(qc
);
3042 /* another command may start at this point */
3049 * swap_buf_le16 - swap halves of 16-bit words in place
3050 * @buf: Buffer to swap
3051 * @buf_words: Number of 16-bit words in buffer.
3053 * Swap halves of 16-bit words if needed to convert from
3054 * little-endian byte order to native cpu byte order, or
3058 * Inherited from caller.
3060 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3065 for (i
= 0; i
< buf_words
; i
++)
3066 buf
[i
] = le16_to_cpu(buf
[i
]);
3067 #endif /* __BIG_ENDIAN */
3071 * ata_mmio_data_xfer - Transfer data by MMIO
3072 * @ap: port to read/write
3074 * @buflen: buffer length
3075 * @write_data: read/write
3077 * Transfer data from/to the device data register by MMIO.
3080 * Inherited from caller.
3083 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3084 unsigned int buflen
, int write_data
)
3087 unsigned int words
= buflen
>> 1;
3088 u16
*buf16
= (u16
*) buf
;
3089 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3091 /* Transfer multiple of 2 bytes */
3093 for (i
= 0; i
< words
; i
++)
3094 writew(le16_to_cpu(buf16
[i
]), mmio
);
3096 for (i
= 0; i
< words
; i
++)
3097 buf16
[i
] = cpu_to_le16(readw(mmio
));
3100 /* Transfer trailing 1 byte, if any. */
3101 if (unlikely(buflen
& 0x01)) {
3102 u16 align_buf
[1] = { 0 };
3103 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3106 memcpy(align_buf
, trailing_buf
, 1);
3107 writew(le16_to_cpu(align_buf
[0]), mmio
);
3109 align_buf
[0] = cpu_to_le16(readw(mmio
));
3110 memcpy(trailing_buf
, align_buf
, 1);
3116 * ata_pio_data_xfer - Transfer data by PIO
3117 * @ap: port to read/write
3119 * @buflen: buffer length
3120 * @write_data: read/write
3122 * Transfer data from/to the device data register by PIO.
3125 * Inherited from caller.
3128 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3129 unsigned int buflen
, int write_data
)
3131 unsigned int words
= buflen
>> 1;
3133 /* Transfer multiple of 2 bytes */
3135 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3137 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3139 /* Transfer trailing 1 byte, if any. */
3140 if (unlikely(buflen
& 0x01)) {
3141 u16 align_buf
[1] = { 0 };
3142 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3145 memcpy(align_buf
, trailing_buf
, 1);
3146 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3148 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3149 memcpy(trailing_buf
, align_buf
, 1);
3155 * ata_data_xfer - Transfer data from/to the data register.
3156 * @ap: port to read/write
3158 * @buflen: buffer length
3159 * @do_write: read/write
3161 * Transfer data from/to the device data register.
3164 * Inherited from caller.
3167 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3168 unsigned int buflen
, int do_write
)
3170 /* Make the crap hardware pay the costs not the good stuff */
3171 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3172 unsigned long flags
;
3173 local_irq_save(flags
);
3174 if (ap
->flags
& ATA_FLAG_MMIO
)
3175 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3177 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3178 local_irq_restore(flags
);
3180 if (ap
->flags
& ATA_FLAG_MMIO
)
3181 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3183 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3188 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3189 * @qc: Command on going
3191 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3194 * Inherited from caller.
3197 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3199 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3200 struct scatterlist
*sg
= qc
->__sg
;
3201 struct ata_port
*ap
= qc
->ap
;
3203 unsigned int offset
;
3206 if (qc
->cursect
== (qc
->nsect
- 1))
3207 ap
->hsm_task_state
= HSM_ST_LAST
;
3209 page
= sg
[qc
->cursg
].page
;
3210 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3212 /* get the current page and offset */
3213 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3214 offset
%= PAGE_SIZE
;
3216 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3218 if (PageHighMem(page
)) {
3219 unsigned long flags
;
3221 local_irq_save(flags
);
3222 buf
= kmap_atomic(page
, KM_IRQ0
);
3224 /* do the actual data transfer */
3225 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3227 kunmap_atomic(buf
, KM_IRQ0
);
3228 local_irq_restore(flags
);
3230 buf
= page_address(page
);
3231 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3237 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3244 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3245 * @qc: Command on going
3247 * Transfer one or many ATA_SECT_SIZE of data from/to the
3248 * ATA device for the DRQ request.
3251 * Inherited from caller.
3254 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3256 if (is_multi_taskfile(&qc
->tf
)) {
3257 /* READ/WRITE MULTIPLE */
3260 WARN_ON(qc
->dev
->multi_count
== 0);
3262 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3270 * atapi_send_cdb - Write CDB bytes to hardware
3271 * @ap: Port to which ATAPI device is attached.
3272 * @qc: Taskfile currently active
3274 * When device has indicated its readiness to accept
3275 * a CDB, this function is called. Send the CDB.
3281 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3284 DPRINTK("send cdb\n");
3285 WARN_ON(ap
->cdb_len
< 12);
3287 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
3288 ata_altstatus(ap
); /* flush */
3290 switch (qc
->tf
.protocol
) {
3291 case ATA_PROT_ATAPI
:
3292 ap
->hsm_task_state
= HSM_ST
;
3294 case ATA_PROT_ATAPI_NODATA
:
3295 ap
->hsm_task_state
= HSM_ST_LAST
;
3297 case ATA_PROT_ATAPI_DMA
:
3298 ap
->hsm_task_state
= HSM_ST_LAST
;
3299 /* initiate bmdma */
3300 ap
->ops
->bmdma_start(qc
);
3306 * ata_pio_first_block - Write first data block to hardware
3307 * @ap: Port to which ATA/ATAPI device is attached.
3309 * When device has indicated its readiness to accept
3310 * the data, this function sends out the CDB or
3311 * the first data block by PIO.
3313 * - If polling, ata_pio_task() handles the rest.
3314 * - Otherwise, interrupt handler takes over.
3317 * Kernel thread context (may sleep)
3320 * Zero if irq handler takes over
3321 * Non-zero if has next (polling).
3324 static int ata_pio_first_block(struct ata_port
*ap
)
3326 struct ata_queued_cmd
*qc
;
3328 unsigned long flags
;
3331 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3332 WARN_ON(qc
== NULL
);
3333 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3335 /* if polling, we will stay in the work queue after sending the data.
3336 * otherwise, interrupt handler takes over after sending the data.
3338 has_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3340 /* sleep-wait for BSY to clear */
3341 DPRINTK("busy wait\n");
3342 if (ata_busy_sleep(ap
, ATA_TMOUT_DATAOUT_QUICK
, ATA_TMOUT_DATAOUT
)) {
3343 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3344 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3348 /* make sure DRQ is set */
3349 status
= ata_chk_status(ap
);
3350 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3351 /* device status error */
3352 qc
->err_mask
|= AC_ERR_HSM
;
3353 ap
->hsm_task_state
= HSM_ST_ERR
;
3357 /* Send the CDB (atapi) or the first data block (ata pio out).
3358 * During the state transition, interrupt handler shouldn't
3359 * be invoked before the data transfer is complete and
3360 * hsm_task_state is changed. Hence, the following locking.
3362 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3364 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
3365 /* PIO data out protocol.
3366 * send first data block.
3369 /* ata_pio_sectors() might change the state to HSM_ST_LAST.
3370 * so, the state is changed here before ata_pio_sectors().
3372 ap
->hsm_task_state
= HSM_ST
;
3373 ata_pio_sectors(qc
);
3374 ata_altstatus(ap
); /* flush */
3377 atapi_send_cdb(ap
, qc
);
3379 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3381 /* if polling, ata_pio_task() handles the rest.
3382 * otherwise, interrupt handler takes over from here.
3387 return 1; /* has next */
3391 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3392 * @qc: Command on going
3393 * @bytes: number of bytes
3395 * Transfer Transfer data from/to the ATAPI device.
3398 * Inherited from caller.
3402 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3404 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3405 struct scatterlist
*sg
= qc
->__sg
;
3406 struct ata_port
*ap
= qc
->ap
;
3409 unsigned int offset
, count
;
3411 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3412 ap
->hsm_task_state
= HSM_ST_LAST
;
3415 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3417 * The end of qc->sg is reached and the device expects
3418 * more data to transfer. In order not to overrun qc->sg
3419 * and fulfill length specified in the byte count register,
3420 * - for read case, discard trailing data from the device
3421 * - for write case, padding zero data to the device
3423 u16 pad_buf
[1] = { 0 };
3424 unsigned int words
= bytes
>> 1;
3427 if (words
) /* warning if bytes > 1 */
3428 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3431 for (i
= 0; i
< words
; i
++)
3432 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3434 ap
->hsm_task_state
= HSM_ST_LAST
;
3438 sg
= &qc
->__sg
[qc
->cursg
];
3441 offset
= sg
->offset
+ qc
->cursg_ofs
;
3443 /* get the current page and offset */
3444 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3445 offset
%= PAGE_SIZE
;
3447 /* don't overrun current sg */
3448 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3450 /* don't cross page boundaries */
3451 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3453 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3455 if (PageHighMem(page
)) {
3456 unsigned long flags
;
3458 local_irq_save(flags
);
3459 buf
= kmap_atomic(page
, KM_IRQ0
);
3461 /* do the actual data transfer */
3462 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3464 kunmap_atomic(buf
, KM_IRQ0
);
3465 local_irq_restore(flags
);
3467 buf
= page_address(page
);
3468 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3472 qc
->curbytes
+= count
;
3473 qc
->cursg_ofs
+= count
;
3475 if (qc
->cursg_ofs
== sg
->length
) {
3485 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3486 * @qc: Command on going
3488 * Transfer Transfer data from/to the ATAPI device.
3491 * Inherited from caller.
3494 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3496 struct ata_port
*ap
= qc
->ap
;
3497 struct ata_device
*dev
= qc
->dev
;
3498 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3499 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3501 ap
->ops
->tf_read(ap
, &qc
->tf
);
3502 ireason
= qc
->tf
.nsect
;
3503 bc_lo
= qc
->tf
.lbam
;
3504 bc_hi
= qc
->tf
.lbah
;
3505 bytes
= (bc_hi
<< 8) | bc_lo
;
3507 /* shall be cleared to zero, indicating xfer of data */
3508 if (ireason
& (1 << 0))
3511 /* make sure transfer direction matches expected */
3512 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3513 if (do_write
!= i_write
)
3516 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3518 __atapi_pio_bytes(qc
, bytes
);
3523 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3524 ap
->id
, dev
->devno
);
3525 qc
->err_mask
|= AC_ERR_HSM
;
3526 ap
->hsm_task_state
= HSM_ST_ERR
;
3530 * ata_pio_block - start PIO on a block
3531 * @ap: the target ata_port
3534 * None. (executing in kernel thread context)
3537 static void ata_pio_block(struct ata_port
*ap
)
3539 struct ata_queued_cmd
*qc
;
3543 * This is purely heuristic. This is a fast path.
3544 * Sometimes when we enter, BSY will be cleared in
3545 * a chk-status or two. If not, the drive is probably seeking
3546 * or something. Snooze for a couple msecs, then
3547 * chk-status again. If still busy, fall back to
3548 * HSM_ST_POLL state.
3550 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3551 if (status
& ATA_BUSY
) {
3553 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3554 if (status
& ATA_BUSY
) {
3555 ap
->hsm_task_state
= HSM_ST_POLL
;
3556 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3561 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3562 WARN_ON(qc
== NULL
);
3565 if (status
& (ATA_ERR
| ATA_DF
)) {
3566 qc
->err_mask
|= AC_ERR_DEV
;
3567 ap
->hsm_task_state
= HSM_ST_ERR
;
3571 /* transfer data if any */
3572 if (is_atapi_taskfile(&qc
->tf
)) {
3573 /* DRQ=0 means no more data to transfer */
3574 if ((status
& ATA_DRQ
) == 0) {
3575 ap
->hsm_task_state
= HSM_ST_LAST
;
3579 atapi_pio_bytes(qc
);
3581 /* handle BSY=0, DRQ=0 as error */
3582 if ((status
& ATA_DRQ
) == 0) {
3583 qc
->err_mask
|= AC_ERR_HSM
;
3584 ap
->hsm_task_state
= HSM_ST_ERR
;
3588 ata_pio_sectors(qc
);
3591 ata_altstatus(ap
); /* flush */
3594 static void ata_pio_error(struct ata_port
*ap
)
3596 struct ata_queued_cmd
*qc
;
3598 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3599 WARN_ON(qc
== NULL
);
3601 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3602 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3604 /* make sure qc->err_mask is available to
3605 * know what's wrong and recover
3607 WARN_ON(qc
->err_mask
== 0);
3609 ap
->hsm_task_state
= HSM_ST_IDLE
;
3611 ata_poll_qc_complete(qc
);
3614 static void ata_pio_task(void *_data
)
3616 struct ata_port
*ap
= _data
;
3617 unsigned long timeout
;
3624 switch (ap
->hsm_task_state
) {
3626 has_next
= ata_pio_first_block(ap
);
3634 has_next
= ata_pio_complete(ap
);
3638 case HSM_ST_LAST_POLL
:
3639 timeout
= ata_pio_poll(ap
);
3653 ata_queue_delayed_pio_task(ap
, timeout
);
3659 * ata_qc_timeout - Handle timeout of queued command
3660 * @qc: Command that timed out
3662 * Some part of the kernel (currently, only the SCSI layer)
3663 * has noticed that the active command on port @ap has not
3664 * completed after a specified length of time. Handle this
3665 * condition by disabling DMA (if necessary) and completing
3666 * transactions, with error if necessary.
3668 * This also handles the case of the "lost interrupt", where
3669 * for some reason (possibly hardware bug, possibly driver bug)
3670 * an interrupt was not delivered to the driver, even though the
3671 * transaction completed successfully.
3674 * Inherited from SCSI layer (none, can sleep)
3677 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3679 struct ata_port
*ap
= qc
->ap
;
3680 struct ata_host_set
*host_set
= ap
->host_set
;
3681 u8 host_stat
= 0, drv_stat
;
3682 unsigned long flags
;
3686 ata_flush_pio_tasks(ap
);
3687 ap
->hsm_task_state
= HSM_ST_IDLE
;
3689 spin_lock_irqsave(&host_set
->lock
, flags
);
3691 switch (qc
->tf
.protocol
) {
3694 case ATA_PROT_ATAPI_DMA
:
3695 host_stat
= ap
->ops
->bmdma_status(ap
);
3697 /* before we do anything else, clear DMA-Start bit */
3698 ap
->ops
->bmdma_stop(qc
);
3704 drv_stat
= ata_chk_status(ap
);
3706 /* ack bmdma irq events */
3707 ap
->ops
->irq_clear(ap
);
3709 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3710 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3712 ap
->hsm_task_state
= HSM_ST_IDLE
;
3714 /* complete taskfile transaction */
3715 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3719 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3721 ata_eh_qc_complete(qc
);
3727 * ata_eng_timeout - Handle timeout of queued command
3728 * @ap: Port on which timed-out command is active
3730 * Some part of the kernel (currently, only the SCSI layer)
3731 * has noticed that the active command on port @ap has not
3732 * completed after a specified length of time. Handle this
3733 * condition by disabling DMA (if necessary) and completing
3734 * transactions, with error if necessary.
3736 * This also handles the case of the "lost interrupt", where
3737 * for some reason (possibly hardware bug, possibly driver bug)
3738 * an interrupt was not delivered to the driver, even though the
3739 * transaction completed successfully.
3742 * Inherited from SCSI layer (none, can sleep)
3745 void ata_eng_timeout(struct ata_port
*ap
)
3749 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3755 * ata_qc_new - Request an available ATA command, for queueing
3756 * @ap: Port associated with device @dev
3757 * @dev: Device from whom we request an available command structure
3763 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3765 struct ata_queued_cmd
*qc
= NULL
;
3768 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3769 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3770 qc
= ata_qc_from_tag(ap
, i
);
3781 * ata_qc_new_init - Request an available ATA command, and initialize it
3782 * @ap: Port associated with device @dev
3783 * @dev: Device from whom we request an available command structure
3789 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3790 struct ata_device
*dev
)
3792 struct ata_queued_cmd
*qc
;
3794 qc
= ata_qc_new(ap
);
3807 * ata_qc_free - free unused ata_queued_cmd
3808 * @qc: Command to complete
3810 * Designed to free unused ata_queued_cmd object
3811 * in case something prevents using it.
3814 * spin_lock_irqsave(host_set lock)
3816 void ata_qc_free(struct ata_queued_cmd
*qc
)
3818 struct ata_port
*ap
= qc
->ap
;
3821 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3825 if (likely(ata_tag_valid(tag
))) {
3826 if (tag
== ap
->active_tag
)
3827 ap
->active_tag
= ATA_TAG_POISON
;
3828 qc
->tag
= ATA_TAG_POISON
;
3829 clear_bit(tag
, &ap
->qactive
);
3833 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3835 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3836 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3838 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3841 /* atapi: mark qc as inactive to prevent the interrupt handler
3842 * from completing the command twice later, before the error handler
3843 * is called. (when rc != 0 and atapi request sense is needed)
3845 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3847 /* call completion callback */
3848 qc
->complete_fn(qc
);
3851 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3853 struct ata_port
*ap
= qc
->ap
;
3855 switch (qc
->tf
.protocol
) {
3857 case ATA_PROT_ATAPI_DMA
:
3860 case ATA_PROT_ATAPI
:
3862 case ATA_PROT_PIO_MULT
:
3863 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3876 * ata_qc_issue - issue taskfile to device
3877 * @qc: command to issue to device
3879 * Prepare an ATA command to submission to device.
3880 * This includes mapping the data into a DMA-able
3881 * area, filling in the S/G table, and finally
3882 * writing the taskfile to hardware, starting the command.
3885 * spin_lock_irqsave(host_set lock)
3888 * Zero on success, AC_ERR_* mask on failure
3891 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3893 struct ata_port
*ap
= qc
->ap
;
3895 if (ata_should_dma_map(qc
)) {
3896 if (qc
->flags
& ATA_QCFLAG_SG
) {
3897 if (ata_sg_setup(qc
))
3899 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3900 if (ata_sg_setup_one(qc
))
3904 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3907 ap
->ops
->qc_prep(qc
);
3909 qc
->ap
->active_tag
= qc
->tag
;
3910 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3912 return ap
->ops
->qc_issue(qc
);
3915 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3916 return AC_ERR_SYSTEM
;
3921 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3922 * @qc: command to issue to device
3924 * Using various libata functions and hooks, this function
3925 * starts an ATA command. ATA commands are grouped into
3926 * classes called "protocols", and issuing each type of protocol
3927 * is slightly different.
3929 * May be used as the qc_issue() entry in ata_port_operations.
3932 * spin_lock_irqsave(host_set lock)
3935 * Zero on success, AC_ERR_* mask on failure
3938 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3940 struct ata_port
*ap
= qc
->ap
;
3942 /* Use polling pio if the LLD doesn't handle
3943 * interrupt driven pio and atapi CDB interrupt.
3945 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
3946 switch (qc
->tf
.protocol
) {
3948 case ATA_PROT_ATAPI
:
3949 case ATA_PROT_ATAPI_NODATA
:
3950 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
3952 case ATA_PROT_ATAPI_DMA
:
3953 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
3961 /* select the device */
3962 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3964 /* start the command */
3965 switch (qc
->tf
.protocol
) {
3966 case ATA_PROT_NODATA
:
3967 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3968 ata_qc_set_polling(qc
);
3970 ata_tf_to_host(ap
, &qc
->tf
);
3971 ap
->hsm_task_state
= HSM_ST_LAST
;
3973 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3974 ata_queue_pio_task(ap
);
3979 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3981 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3982 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3983 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3984 ap
->hsm_task_state
= HSM_ST_LAST
;
3988 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3989 ata_qc_set_polling(qc
);
3991 ata_tf_to_host(ap
, &qc
->tf
);
3993 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3994 /* PIO data out protocol */
3995 ap
->hsm_task_state
= HSM_ST_FIRST
;
3996 ata_queue_pio_task(ap
);
3998 /* always send first data block using
3999 * the ata_pio_task() codepath.
4002 /* PIO data in protocol */
4003 ap
->hsm_task_state
= HSM_ST
;
4005 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4006 ata_queue_pio_task(ap
);
4008 /* if polling, ata_pio_task() handles the rest.
4009 * otherwise, interrupt handler takes over from here.
4015 case ATA_PROT_ATAPI
:
4016 case ATA_PROT_ATAPI_NODATA
:
4017 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4018 ata_qc_set_polling(qc
);
4020 ata_tf_to_host(ap
, &qc
->tf
);
4022 ap
->hsm_task_state
= HSM_ST_FIRST
;
4024 /* send cdb by polling if no cdb interrupt */
4025 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4026 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4027 ata_queue_pio_task(ap
);
4030 case ATA_PROT_ATAPI_DMA
:
4031 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4033 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4034 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4035 ap
->hsm_task_state
= HSM_ST_FIRST
;
4037 /* send cdb by polling if no cdb interrupt */
4038 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4039 ata_queue_pio_task(ap
);
4044 return AC_ERR_SYSTEM
;
4051 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4052 * @qc: Info associated with this ATA transaction.
4055 * spin_lock_irqsave(host_set lock)
4058 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
4060 struct ata_port
*ap
= qc
->ap
;
4061 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4063 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4065 /* load PRD table addr. */
4066 mb(); /* make sure PRD table writes are visible to controller */
4067 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
4069 /* specify data direction, triple-check start bit is clear */
4070 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4071 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4073 dmactl
|= ATA_DMA_WR
;
4074 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
4076 /* issue r/w command */
4077 ap
->ops
->exec_command(ap
, &qc
->tf
);
4081 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4082 * @qc: Info associated with this ATA transaction.
4085 * spin_lock_irqsave(host_set lock)
4088 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4090 struct ata_port
*ap
= qc
->ap
;
4091 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4094 /* start host DMA transaction */
4095 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4096 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4098 /* Strictly, one may wish to issue a readb() here, to
4099 * flush the mmio write. However, control also passes
4100 * to the hardware at this point, and it will interrupt
4101 * us when we are to resume control. So, in effect,
4102 * we don't care when the mmio write flushes.
4103 * Further, a read of the DMA status register _immediately_
4104 * following the write may not be what certain flaky hardware
4105 * is expected, so I think it is best to not add a readb()
4106 * without first all the MMIO ATA cards/mobos.
4107 * Or maybe I'm just being paranoid.
4112 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4113 * @qc: Info associated with this ATA transaction.
4116 * spin_lock_irqsave(host_set lock)
4119 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4121 struct ata_port
*ap
= qc
->ap
;
4122 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4125 /* load PRD table addr. */
4126 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4128 /* specify data direction, triple-check start bit is clear */
4129 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4130 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4132 dmactl
|= ATA_DMA_WR
;
4133 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4135 /* issue r/w command */
4136 ap
->ops
->exec_command(ap
, &qc
->tf
);
4140 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4141 * @qc: Info associated with this ATA transaction.
4144 * spin_lock_irqsave(host_set lock)
4147 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4149 struct ata_port
*ap
= qc
->ap
;
4152 /* start host DMA transaction */
4153 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4154 outb(dmactl
| ATA_DMA_START
,
4155 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4160 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4161 * @qc: Info associated with this ATA transaction.
4163 * Writes the ATA_DMA_START flag to the DMA command register.
4165 * May be used as the bmdma_start() entry in ata_port_operations.
4168 * spin_lock_irqsave(host_set lock)
4170 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4172 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4173 ata_bmdma_start_mmio(qc
);
4175 ata_bmdma_start_pio(qc
);
4180 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4181 * @qc: Info associated with this ATA transaction.
4183 * Writes address of PRD table to device's PRD Table Address
4184 * register, sets the DMA control register, and calls
4185 * ops->exec_command() to start the transfer.
4187 * May be used as the bmdma_setup() entry in ata_port_operations.
4190 * spin_lock_irqsave(host_set lock)
4192 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4194 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4195 ata_bmdma_setup_mmio(qc
);
4197 ata_bmdma_setup_pio(qc
);
4202 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4203 * @ap: Port associated with this ATA transaction.
4205 * Clear interrupt and error flags in DMA status register.
4207 * May be used as the irq_clear() entry in ata_port_operations.
4210 * spin_lock_irqsave(host_set lock)
4213 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4215 if (ap
->flags
& ATA_FLAG_MMIO
) {
4216 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4217 writeb(readb(mmio
), mmio
);
4219 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4220 outb(inb(addr
), addr
);
4227 * ata_bmdma_status - Read PCI IDE BMDMA status
4228 * @ap: Port associated with this ATA transaction.
4230 * Read and return BMDMA status register.
4232 * May be used as the bmdma_status() entry in ata_port_operations.
4235 * spin_lock_irqsave(host_set lock)
4238 u8
ata_bmdma_status(struct ata_port
*ap
)
4241 if (ap
->flags
& ATA_FLAG_MMIO
) {
4242 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4243 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4245 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4251 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4252 * @qc: Command we are ending DMA for
4254 * Clears the ATA_DMA_START flag in the dma control register
4256 * May be used as the bmdma_stop() entry in ata_port_operations.
4259 * spin_lock_irqsave(host_set lock)
4262 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4264 struct ata_port
*ap
= qc
->ap
;
4265 if (ap
->flags
& ATA_FLAG_MMIO
) {
4266 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4268 /* clear start/stop bit */
4269 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4270 mmio
+ ATA_DMA_CMD
);
4272 /* clear start/stop bit */
4273 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4274 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4277 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4278 ata_altstatus(ap
); /* dummy read */
4282 * ata_host_intr - Handle host interrupt for given (port, task)
4283 * @ap: Port on which interrupt arrived (possibly...)
4284 * @qc: Taskfile currently active in engine
4286 * Handle host interrupt for given queued command. Currently,
4287 * only DMA interrupts are handled. All other commands are
4288 * handled via polling with interrupts disabled (nIEN bit).
4291 * spin_lock_irqsave(host_set lock)
4294 * One if interrupt was handled, zero if not (shared irq).
4297 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4298 struct ata_queued_cmd
*qc
)
4300 u8 status
, host_stat
= 0;
4302 VPRINTK("ata%u: protocol %d task_state %d\n",
4303 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4305 /* Check whether we are expecting interrupt in this state */
4306 switch (ap
->hsm_task_state
) {
4308 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4309 * The flag was turned on only for atapi devices.
4310 * No need to check is_atapi_taskfile(&qc->tf) again.
4312 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4316 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4317 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4318 /* check status of DMA engine */
4319 host_stat
= ap
->ops
->bmdma_status(ap
);
4320 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4322 /* if it's not our irq... */
4323 if (!(host_stat
& ATA_DMA_INTR
))
4326 /* before we do anything else, clear DMA-Start bit */
4327 ap
->ops
->bmdma_stop(qc
);
4329 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4330 /* error when transfering data to/from memory */
4331 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4332 ap
->hsm_task_state
= HSM_ST_ERR
;
4342 /* check altstatus */
4343 status
= ata_altstatus(ap
);
4344 if (status
& ATA_BUSY
)
4347 /* check main status, clearing INTRQ */
4348 status
= ata_chk_status(ap
);
4349 if (unlikely(status
& ATA_BUSY
))
4352 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4353 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4355 /* ack bmdma irq events */
4356 ap
->ops
->irq_clear(ap
);
4359 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4360 qc
->err_mask
|= AC_ERR_DEV
;
4361 ap
->hsm_task_state
= HSM_ST_ERR
;
4365 switch (ap
->hsm_task_state
) {
4367 /* Some pre-ATAPI-4 devices assert INTRQ
4368 * at this state when ready to receive CDB.
4371 /* check device status */
4372 if (unlikely((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)) {
4373 /* Wrong status. Let EH handle this */
4374 qc
->err_mask
|= AC_ERR_HSM
;
4375 ap
->hsm_task_state
= HSM_ST_ERR
;
4379 atapi_send_cdb(ap
, qc
);
4384 /* complete command or read/write the data register */
4385 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4386 /* ATAPI PIO protocol */
4387 if ((status
& ATA_DRQ
) == 0) {
4388 /* no more data to transfer */
4389 ap
->hsm_task_state
= HSM_ST_LAST
;
4393 atapi_pio_bytes(qc
);
4395 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4396 /* bad ireason reported by device */
4400 /* ATA PIO protocol */
4401 if (unlikely((status
& ATA_DRQ
) == 0)) {
4402 /* handle BSY=0, DRQ=0 as error */
4403 qc
->err_mask
|= AC_ERR_HSM
;
4404 ap
->hsm_task_state
= HSM_ST_ERR
;
4408 ata_pio_sectors(qc
);
4410 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4411 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4414 status
= ata_chk_status(ap
);
4419 ata_altstatus(ap
); /* flush */
4423 if (unlikely(status
& ATA_DRQ
)) {
4424 /* handle DRQ=1 as error */
4425 qc
->err_mask
|= AC_ERR_HSM
;
4426 ap
->hsm_task_state
= HSM_ST_ERR
;
4430 /* no more data to transfer */
4431 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
4434 ap
->hsm_task_state
= HSM_ST_IDLE
;
4436 /* complete taskfile transaction */
4437 qc
->err_mask
|= ac_err_mask(status
);
4438 ata_qc_complete(qc
);
4442 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
4443 printk(KERN_ERR
"ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
4444 ap
->id
, status
, host_stat
);
4446 /* make sure qc->err_mask is available to
4447 * know what's wrong and recover
4449 WARN_ON(qc
->err_mask
== 0);
4451 ap
->hsm_task_state
= HSM_ST_IDLE
;
4452 ata_qc_complete(qc
);
4458 return 1; /* irq handled */
4461 ap
->stats
.idle_irq
++;
4464 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4466 ata_irq_ack(ap
, 0); /* debug trap */
4467 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4470 return 0; /* irq not handled */
4474 * ata_interrupt - Default ATA host interrupt handler
4475 * @irq: irq line (unused)
4476 * @dev_instance: pointer to our ata_host_set information structure
4479 * Default interrupt handler for PCI IDE devices. Calls
4480 * ata_host_intr() for each port that is not disabled.
4483 * Obtains host_set lock during operation.
4486 * IRQ_NONE or IRQ_HANDLED.
4489 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4491 struct ata_host_set
*host_set
= dev_instance
;
4493 unsigned int handled
= 0;
4494 unsigned long flags
;
4496 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4497 spin_lock_irqsave(&host_set
->lock
, flags
);
4499 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4500 struct ata_port
*ap
;
4502 ap
= host_set
->ports
[i
];
4504 !(ap
->flags
& ATA_FLAG_PORT_DISABLED
)) {
4505 struct ata_queued_cmd
*qc
;
4507 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4508 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4509 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4510 handled
|= ata_host_intr(ap
, qc
);
4514 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4516 return IRQ_RETVAL(handled
);
4520 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4521 * without filling any other registers
4523 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4526 struct ata_taskfile tf
;
4529 ata_tf_init(ap
, &tf
, dev
->devno
);
4532 tf
.flags
|= ATA_TFLAG_DEVICE
;
4533 tf
.protocol
= ATA_PROT_NODATA
;
4535 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4537 printk(KERN_ERR
"%s: ata command failed: %d\n",
4543 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4547 if (!ata_try_flush_cache(dev
))
4550 if (ata_id_has_flush_ext(dev
->id
))
4551 cmd
= ATA_CMD_FLUSH_EXT
;
4553 cmd
= ATA_CMD_FLUSH
;
4555 return ata_do_simple_cmd(ap
, dev
, cmd
);
4558 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4560 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4563 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4565 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4569 * ata_device_resume - wakeup a previously suspended devices
4570 * @ap: port the device is connected to
4571 * @dev: the device to resume
4573 * Kick the drive back into action, by sending it an idle immediate
4574 * command and making sure its transfer mode matches between drive
4578 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4580 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4581 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4584 if (!ata_dev_present(dev
))
4586 if (dev
->class == ATA_DEV_ATA
)
4587 ata_start_drive(ap
, dev
);
4593 * ata_device_suspend - prepare a device for suspend
4594 * @ap: port the device is connected to
4595 * @dev: the device to suspend
4597 * Flush the cache on the drive, if appropriate, then issue a
4598 * standbynow command.
4600 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4602 if (!ata_dev_present(dev
))
4604 if (dev
->class == ATA_DEV_ATA
)
4605 ata_flush_cache(ap
, dev
);
4607 ata_standby_drive(ap
, dev
);
4608 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4613 * ata_port_start - Set port up for dma.
4614 * @ap: Port to initialize
4616 * Called just after data structures for each port are
4617 * initialized. Allocates space for PRD table.
4619 * May be used as the port_start() entry in ata_port_operations.
4622 * Inherited from caller.
4625 int ata_port_start (struct ata_port
*ap
)
4627 struct device
*dev
= ap
->host_set
->dev
;
4630 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4634 rc
= ata_pad_alloc(ap
, dev
);
4636 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4640 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4647 * ata_port_stop - Undo ata_port_start()
4648 * @ap: Port to shut down
4650 * Frees the PRD table.
4652 * May be used as the port_stop() entry in ata_port_operations.
4655 * Inherited from caller.
4658 void ata_port_stop (struct ata_port
*ap
)
4660 struct device
*dev
= ap
->host_set
->dev
;
4662 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4663 ata_pad_free(ap
, dev
);
4666 void ata_host_stop (struct ata_host_set
*host_set
)
4668 if (host_set
->mmio_base
)
4669 iounmap(host_set
->mmio_base
);
4674 * ata_host_remove - Unregister SCSI host structure with upper layers
4675 * @ap: Port to unregister
4676 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4679 * Inherited from caller.
4682 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4684 struct Scsi_Host
*sh
= ap
->host
;
4689 scsi_remove_host(sh
);
4691 ap
->ops
->port_stop(ap
);
4695 * ata_host_init - Initialize an ata_port structure
4696 * @ap: Structure to initialize
4697 * @host: associated SCSI mid-layer structure
4698 * @host_set: Collection of hosts to which @ap belongs
4699 * @ent: Probe information provided by low-level driver
4700 * @port_no: Port number associated with this ata_port
4702 * Initialize a new ata_port structure, and its associated
4706 * Inherited from caller.
4709 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4710 struct ata_host_set
*host_set
,
4711 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4717 host
->max_channel
= 1;
4718 host
->unique_id
= ata_unique_id
++;
4719 host
->max_cmd_len
= 12;
4721 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4722 ap
->id
= host
->unique_id
;
4724 ap
->ctl
= ATA_DEVCTL_OBS
;
4725 ap
->host_set
= host_set
;
4726 ap
->port_no
= port_no
;
4728 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4729 ap
->pio_mask
= ent
->pio_mask
;
4730 ap
->mwdma_mask
= ent
->mwdma_mask
;
4731 ap
->udma_mask
= ent
->udma_mask
;
4732 ap
->flags
|= ent
->host_flags
;
4733 ap
->ops
= ent
->port_ops
;
4734 ap
->cbl
= ATA_CBL_NONE
;
4735 ap
->active_tag
= ATA_TAG_POISON
;
4736 ap
->last_ctl
= 0xFF;
4738 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4739 INIT_LIST_HEAD(&ap
->eh_done_q
);
4741 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4742 ap
->device
[i
].devno
= i
;
4745 ap
->stats
.unhandled_irq
= 1;
4746 ap
->stats
.idle_irq
= 1;
4749 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4753 * ata_host_add - Attach low-level ATA driver to system
4754 * @ent: Information provided by low-level driver
4755 * @host_set: Collections of ports to which we add
4756 * @port_no: Port number associated with this host
4758 * Attach low-level ATA driver to system.
4761 * PCI/etc. bus probe sem.
4764 * New ata_port on success, for NULL on error.
4767 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4768 struct ata_host_set
*host_set
,
4769 unsigned int port_no
)
4771 struct Scsi_Host
*host
;
4772 struct ata_port
*ap
;
4776 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4780 ap
= (struct ata_port
*) &host
->hostdata
[0];
4782 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4784 rc
= ap
->ops
->port_start(ap
);
4791 scsi_host_put(host
);
4796 * ata_device_add - Register hardware device with ATA and SCSI layers
4797 * @ent: Probe information describing hardware device to be registered
4799 * This function processes the information provided in the probe
4800 * information struct @ent, allocates the necessary ATA and SCSI
4801 * host information structures, initializes them, and registers
4802 * everything with requisite kernel subsystems.
4804 * This function requests irqs, probes the ATA bus, and probes
4808 * PCI/etc. bus probe sem.
4811 * Number of ports registered. Zero on error (no ports registered).
4814 int ata_device_add(const struct ata_probe_ent
*ent
)
4816 unsigned int count
= 0, i
;
4817 struct device
*dev
= ent
->dev
;
4818 struct ata_host_set
*host_set
;
4821 /* alloc a container for our list of ATA ports (buses) */
4822 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4823 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4826 spin_lock_init(&host_set
->lock
);
4828 host_set
->dev
= dev
;
4829 host_set
->n_ports
= ent
->n_ports
;
4830 host_set
->irq
= ent
->irq
;
4831 host_set
->mmio_base
= ent
->mmio_base
;
4832 host_set
->private_data
= ent
->private_data
;
4833 host_set
->ops
= ent
->port_ops
;
4835 /* register each port bound to this device */
4836 for (i
= 0; i
< ent
->n_ports
; i
++) {
4837 struct ata_port
*ap
;
4838 unsigned long xfer_mode_mask
;
4840 ap
= ata_host_add(ent
, host_set
, i
);
4844 host_set
->ports
[i
] = ap
;
4845 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4846 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4847 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4849 /* print per-port info to dmesg */
4850 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4851 "bmdma 0x%lX irq %lu\n",
4853 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4854 ata_mode_string(xfer_mode_mask
),
4855 ap
->ioaddr
.cmd_addr
,
4856 ap
->ioaddr
.ctl_addr
,
4857 ap
->ioaddr
.bmdma_addr
,
4861 host_set
->ops
->irq_clear(ap
);
4868 /* obtain irq, that is shared between channels */
4869 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4870 DRV_NAME
, host_set
))
4873 /* perform each probe synchronously */
4874 DPRINTK("probe begin\n");
4875 for (i
= 0; i
< count
; i
++) {
4876 struct ata_port
*ap
;
4879 ap
= host_set
->ports
[i
];
4881 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4882 rc
= ata_bus_probe(ap
);
4883 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4886 /* FIXME: do something useful here?
4887 * Current libata behavior will
4888 * tear down everything when
4889 * the module is removed
4890 * or the h/w is unplugged.
4894 rc
= scsi_add_host(ap
->host
, dev
);
4896 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4898 /* FIXME: do something useful here */
4899 /* FIXME: handle unconditional calls to
4900 * scsi_scan_host and ata_host_remove, below,
4906 /* probes are done, now scan each port's disk(s) */
4907 DPRINTK("host probe begin\n");
4908 for (i
= 0; i
< count
; i
++) {
4909 struct ata_port
*ap
= host_set
->ports
[i
];
4911 ata_scsi_scan_host(ap
);
4914 dev_set_drvdata(dev
, host_set
);
4916 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4917 return ent
->n_ports
; /* success */
4920 for (i
= 0; i
< count
; i
++) {
4921 ata_host_remove(host_set
->ports
[i
], 1);
4922 scsi_host_put(host_set
->ports
[i
]->host
);
4926 VPRINTK("EXIT, returning 0\n");
4931 * ata_host_set_remove - PCI layer callback for device removal
4932 * @host_set: ATA host set that was removed
4934 * Unregister all objects associated with this host set. Free those
4938 * Inherited from calling layer (may sleep).
4941 void ata_host_set_remove(struct ata_host_set
*host_set
)
4943 struct ata_port
*ap
;
4946 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4947 ap
= host_set
->ports
[i
];
4948 scsi_remove_host(ap
->host
);
4951 free_irq(host_set
->irq
, host_set
);
4953 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4954 ap
= host_set
->ports
[i
];
4956 ata_scsi_release(ap
->host
);
4958 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4959 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4961 if (ioaddr
->cmd_addr
== 0x1f0)
4962 release_region(0x1f0, 8);
4963 else if (ioaddr
->cmd_addr
== 0x170)
4964 release_region(0x170, 8);
4967 scsi_host_put(ap
->host
);
4970 if (host_set
->ops
->host_stop
)
4971 host_set
->ops
->host_stop(host_set
);
4977 * ata_scsi_release - SCSI layer callback hook for host unload
4978 * @host: libata host to be unloaded
4980 * Performs all duties necessary to shut down a libata port...
4981 * Kill port kthread, disable port, and release resources.
4984 * Inherited from SCSI layer.
4990 int ata_scsi_release(struct Scsi_Host
*host
)
4992 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4996 ap
->ops
->port_disable(ap
);
4997 ata_host_remove(ap
, 0);
5004 * ata_std_ports - initialize ioaddr with standard port offsets.
5005 * @ioaddr: IO address structure to be initialized
5007 * Utility function which initializes data_addr, error_addr,
5008 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5009 * device_addr, status_addr, and command_addr to standard offsets
5010 * relative to cmd_addr.
5012 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5015 void ata_std_ports(struct ata_ioports
*ioaddr
)
5017 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5018 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5019 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5020 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5021 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5022 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5023 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5024 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5025 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5026 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5032 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5034 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5036 pci_iounmap(pdev
, host_set
->mmio_base
);
5040 * ata_pci_remove_one - PCI layer callback for device removal
5041 * @pdev: PCI device that was removed
5043 * PCI layer indicates to libata via this hook that
5044 * hot-unplug or module unload event has occurred.
5045 * Handle this by unregistering all objects associated
5046 * with this PCI device. Free those objects. Then finally
5047 * release PCI resources and disable device.
5050 * Inherited from PCI layer (may sleep).
5053 void ata_pci_remove_one (struct pci_dev
*pdev
)
5055 struct device
*dev
= pci_dev_to_dev(pdev
);
5056 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5058 ata_host_set_remove(host_set
);
5059 pci_release_regions(pdev
);
5060 pci_disable_device(pdev
);
5061 dev_set_drvdata(dev
, NULL
);
5064 /* move to PCI subsystem */
5065 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5067 unsigned long tmp
= 0;
5069 switch (bits
->width
) {
5072 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5078 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5084 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5095 return (tmp
== bits
->val
) ? 1 : 0;
5098 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5100 pci_save_state(pdev
);
5101 pci_disable_device(pdev
);
5102 pci_set_power_state(pdev
, PCI_D3hot
);
5106 int ata_pci_device_resume(struct pci_dev
*pdev
)
5108 pci_set_power_state(pdev
, PCI_D0
);
5109 pci_restore_state(pdev
);
5110 pci_enable_device(pdev
);
5111 pci_set_master(pdev
);
5114 #endif /* CONFIG_PCI */
5117 static int __init
ata_init(void)
5119 ata_wq
= create_workqueue("ata");
5123 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5127 static void __exit
ata_exit(void)
5129 destroy_workqueue(ata_wq
);
5132 module_init(ata_init
);
5133 module_exit(ata_exit
);
5135 static unsigned long ratelimit_time
;
5136 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5138 int ata_ratelimit(void)
5141 unsigned long flags
;
5143 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5145 if (time_after(jiffies
, ratelimit_time
)) {
5147 ratelimit_time
= jiffies
+ (HZ
/5);
5151 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5157 * libata is essentially a library of internal helper functions for
5158 * low-level ATA host controller drivers. As such, the API/ABI is
5159 * likely to change as new drivers are added and updated.
5160 * Do not depend on ABI/API stability.
5163 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5164 EXPORT_SYMBOL_GPL(ata_std_ports
);
5165 EXPORT_SYMBOL_GPL(ata_device_add
);
5166 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5167 EXPORT_SYMBOL_GPL(ata_sg_init
);
5168 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5169 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5170 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5171 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5172 EXPORT_SYMBOL_GPL(ata_tf_load
);
5173 EXPORT_SYMBOL_GPL(ata_tf_read
);
5174 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5175 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5176 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5177 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5178 EXPORT_SYMBOL_GPL(ata_check_status
);
5179 EXPORT_SYMBOL_GPL(ata_altstatus
);
5180 EXPORT_SYMBOL_GPL(ata_exec_command
);
5181 EXPORT_SYMBOL_GPL(ata_port_start
);
5182 EXPORT_SYMBOL_GPL(ata_port_stop
);
5183 EXPORT_SYMBOL_GPL(ata_host_stop
);
5184 EXPORT_SYMBOL_GPL(ata_interrupt
);
5185 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5186 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5187 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5188 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5189 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5190 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5191 EXPORT_SYMBOL_GPL(ata_port_probe
);
5192 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5193 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5194 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5195 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5196 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5197 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5198 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5199 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5200 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5201 EXPORT_SYMBOL_GPL(ata_port_disable
);
5202 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5203 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5204 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5205 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5206 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
5207 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5208 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5209 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5210 EXPORT_SYMBOL_GPL(ata_host_intr
);
5211 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5212 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
5213 EXPORT_SYMBOL_GPL(ata_dev_id_c_string
);
5214 EXPORT_SYMBOL_GPL(ata_dev_config
);
5215 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5216 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5217 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5219 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5220 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5221 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5224 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5225 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5226 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5227 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5228 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5229 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5230 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5231 #endif /* CONFIG_PCI */
5233 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5234 EXPORT_SYMBOL_GPL(ata_device_resume
);
5235 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5236 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);