2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static unsigned int ata_dev_xfermask(struct ata_port
*ap
,
69 struct ata_device
*dev
);
71 static unsigned int ata_unique_id
= 1;
72 static struct workqueue_struct
*ata_wq
;
74 int atapi_enabled
= 1;
75 module_param(atapi_enabled
, int, 0444);
76 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
79 module_param_named(fua
, libata_fua
, int, 0444);
80 MODULE_PARM_DESC(fua
, "FUA support (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
];
232 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
233 * @pio_mask: pio_mask
234 * @mwdma_mask: mwdma_mask
235 * @udma_mask: udma_mask
237 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
238 * unsigned int xfer_mask.
246 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
247 unsigned int mwdma_mask
,
248 unsigned int udma_mask
)
250 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
251 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
252 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
255 static const struct ata_xfer_ent
{
256 unsigned int shift
, bits
;
259 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
260 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
261 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
266 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
267 * @xfer_mask: xfer_mask of interest
269 * Return matching XFER_* value for @xfer_mask. Only the highest
270 * bit of @xfer_mask is considered.
276 * Matching XFER_* value, 0 if no match found.
278 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
280 int highbit
= fls(xfer_mask
) - 1;
281 const struct ata_xfer_ent
*ent
;
283 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
284 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
285 return ent
->base
+ highbit
- ent
->shift
;
290 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
291 * @xfer_mode: XFER_* of interest
293 * Return matching xfer_mask for @xfer_mode.
299 * Matching xfer_mask, 0 if no match found.
301 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
303 const struct ata_xfer_ent
*ent
;
305 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
306 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
307 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
312 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
313 * @xfer_mode: XFER_* of interest
315 * Return matching xfer_shift for @xfer_mode.
321 * Matching xfer_shift, -1 if no match found.
323 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
325 const struct ata_xfer_ent
*ent
;
327 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
328 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
334 * ata_mode_string - convert xfer_mask to string
335 * @xfer_mask: mask of bits supported; only highest bit counts.
337 * Determine string which represents the highest speed
338 * (highest bit in @modemask).
344 * Constant C string representing highest speed listed in
345 * @mode_mask, or the constant C string "<n/a>".
347 static const char *ata_mode_string(unsigned int xfer_mask
)
349 static const char * const xfer_mode_str
[] = {
369 highbit
= fls(xfer_mask
) - 1;
370 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
371 return xfer_mode_str
[highbit
];
376 * ata_pio_devchk - PATA device presence detection
377 * @ap: ATA channel to examine
378 * @device: Device to examine (starting at zero)
380 * This technique was originally described in
381 * Hale Landis's ATADRVR (www.ata-atapi.com), and
382 * later found its way into the ATA/ATAPI spec.
384 * Write a pattern to the ATA shadow registers,
385 * and if a device is present, it will respond by
386 * correctly storing and echoing back the
387 * ATA shadow register contents.
393 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
396 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
399 ap
->ops
->dev_select(ap
, device
);
401 outb(0x55, ioaddr
->nsect_addr
);
402 outb(0xaa, ioaddr
->lbal_addr
);
404 outb(0xaa, ioaddr
->nsect_addr
);
405 outb(0x55, ioaddr
->lbal_addr
);
407 outb(0x55, ioaddr
->nsect_addr
);
408 outb(0xaa, ioaddr
->lbal_addr
);
410 nsect
= inb(ioaddr
->nsect_addr
);
411 lbal
= inb(ioaddr
->lbal_addr
);
413 if ((nsect
== 0x55) && (lbal
== 0xaa))
414 return 1; /* we found a device */
416 return 0; /* nothing found */
420 * ata_mmio_devchk - PATA device presence detection
421 * @ap: ATA channel to examine
422 * @device: Device to examine (starting at zero)
424 * This technique was originally described in
425 * Hale Landis's ATADRVR (www.ata-atapi.com), and
426 * later found its way into the ATA/ATAPI spec.
428 * Write a pattern to the ATA shadow registers,
429 * and if a device is present, it will respond by
430 * correctly storing and echoing back the
431 * ATA shadow register contents.
437 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
440 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
443 ap
->ops
->dev_select(ap
, device
);
445 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
446 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
448 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
449 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
451 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
452 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
454 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
455 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
457 if ((nsect
== 0x55) && (lbal
== 0xaa))
458 return 1; /* we found a device */
460 return 0; /* nothing found */
464 * ata_devchk - PATA device presence detection
465 * @ap: ATA channel to examine
466 * @device: Device to examine (starting at zero)
468 * Dispatch ATA device presence detection, depending
469 * on whether we are using PIO or MMIO to talk to the
470 * ATA shadow registers.
476 static unsigned int ata_devchk(struct ata_port
*ap
,
479 if (ap
->flags
& ATA_FLAG_MMIO
)
480 return ata_mmio_devchk(ap
, device
);
481 return ata_pio_devchk(ap
, device
);
485 * ata_dev_classify - determine device type based on ATA-spec signature
486 * @tf: ATA taskfile register set for device to be identified
488 * Determine from taskfile register contents whether a device is
489 * ATA or ATAPI, as per "Signature and persistence" section
490 * of ATA/PI spec (volume 1, sect 5.14).
496 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
497 * the event of failure.
500 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
502 /* Apple's open source Darwin code hints that some devices only
503 * put a proper signature into the LBA mid/high registers,
504 * So, we only check those. It's sufficient for uniqueness.
507 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
508 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
509 DPRINTK("found ATA device by sig\n");
513 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
514 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
515 DPRINTK("found ATAPI device by sig\n");
516 return ATA_DEV_ATAPI
;
519 DPRINTK("unknown device\n");
520 return ATA_DEV_UNKNOWN
;
524 * ata_dev_try_classify - Parse returned ATA device signature
525 * @ap: ATA channel to examine
526 * @device: Device to examine (starting at zero)
527 * @r_err: Value of error register on completion
529 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
530 * an ATA/ATAPI-defined set of values is placed in the ATA
531 * shadow registers, indicating the results of device detection
534 * Select the ATA device, and read the values from the ATA shadow
535 * registers. Then parse according to the Error register value,
536 * and the spec-defined values examined by ata_dev_classify().
542 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
546 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
548 struct ata_taskfile tf
;
552 ap
->ops
->dev_select(ap
, device
);
554 memset(&tf
, 0, sizeof(tf
));
556 ap
->ops
->tf_read(ap
, &tf
);
561 /* see if device passed diags */
564 else if ((device
== 0) && (err
== 0x81))
569 /* determine if device is ATA or ATAPI */
570 class = ata_dev_classify(&tf
);
572 if (class == ATA_DEV_UNKNOWN
)
574 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
580 * ata_id_string - Convert IDENTIFY DEVICE page into string
581 * @id: IDENTIFY DEVICE results we will examine
582 * @s: string into which data is output
583 * @ofs: offset into identify device page
584 * @len: length of string to return. must be an even number.
586 * The strings in the IDENTIFY DEVICE page are broken up into
587 * 16-bit chunks. Run through the string, and output each
588 * 8-bit chunk linearly, regardless of platform.
594 void ata_id_string(const u16
*id
, unsigned char *s
,
595 unsigned int ofs
, unsigned int len
)
614 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
615 * @id: IDENTIFY DEVICE results we will examine
616 * @s: string into which data is output
617 * @ofs: offset into identify device page
618 * @len: length of string to return. must be an odd number.
620 * This function is identical to ata_id_string except that it
621 * trims trailing spaces and terminates the resulting string with
622 * null. @len must be actual maximum length (even number) + 1.
627 void ata_id_c_string(const u16
*id
, unsigned char *s
,
628 unsigned int ofs
, unsigned int len
)
634 ata_id_string(id
, s
, ofs
, len
- 1);
636 p
= s
+ strnlen(s
, len
- 1);
637 while (p
> s
&& p
[-1] == ' ')
642 static u64
ata_id_n_sectors(const u16
*id
)
644 if (ata_id_has_lba(id
)) {
645 if (ata_id_has_lba48(id
))
646 return ata_id_u64(id
, 100);
648 return ata_id_u32(id
, 60);
650 if (ata_id_current_chs_valid(id
))
651 return ata_id_u32(id
, 57);
653 return id
[1] * id
[3] * id
[6];
658 * ata_noop_dev_select - Select device 0/1 on ATA bus
659 * @ap: ATA channel to manipulate
660 * @device: ATA device (numbered from zero) to select
662 * This function performs no actual function.
664 * May be used as the dev_select() entry in ata_port_operations.
669 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
675 * ata_std_dev_select - Select device 0/1 on ATA bus
676 * @ap: ATA channel to manipulate
677 * @device: ATA device (numbered from zero) to select
679 * Use the method defined in the ATA specification to
680 * make either device 0, or device 1, active on the
681 * ATA channel. Works with both PIO and MMIO.
683 * May be used as the dev_select() entry in ata_port_operations.
689 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
694 tmp
= ATA_DEVICE_OBS
;
696 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
698 if (ap
->flags
& ATA_FLAG_MMIO
) {
699 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
701 outb(tmp
, ap
->ioaddr
.device_addr
);
703 ata_pause(ap
); /* needed; also flushes, for mmio */
707 * ata_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
710 * @wait: non-zero to wait for Status register BSY bit to clear
711 * @can_sleep: non-zero if context allows sleeping
713 * Use the method defined in the ATA specification to
714 * make either device 0, or device 1, active on the
717 * This is a high-level version of ata_std_dev_select(),
718 * which additionally provides the services of inserting
719 * the proper pauses and status polling, where needed.
725 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
726 unsigned int wait
, unsigned int can_sleep
)
728 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
729 ap
->id
, device
, wait
);
734 ap
->ops
->dev_select(ap
, device
);
737 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
744 * ata_dump_id - IDENTIFY DEVICE info debugging output
745 * @id: IDENTIFY DEVICE page to dump
747 * Dump selected 16-bit words from the given IDENTIFY DEVICE
754 static inline void ata_dump_id(const u16
*id
)
756 DPRINTK("49==0x%04x "
766 DPRINTK("80==0x%04x "
776 DPRINTK("88==0x%04x "
783 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
784 * @id: IDENTIFY data to compute xfer mask from
786 * Compute the xfermask for this device. This is not as trivial
787 * as it seems if we must consider early devices correctly.
789 * FIXME: pre IDE drive timing (do we care ?).
797 static unsigned int ata_id_xfermask(const u16
*id
)
799 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
801 /* Usual case. Word 53 indicates word 64 is valid */
802 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
803 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
807 /* If word 64 isn't valid then Word 51 high byte holds
808 * the PIO timing number for the maximum. Turn it into
811 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
813 /* But wait.. there's more. Design your standards by
814 * committee and you too can get a free iordy field to
815 * process. However its the speeds not the modes that
816 * are supported... Note drivers using the timing API
817 * will get this right anyway
821 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
824 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
825 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
827 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
831 * ata_port_queue_task - Queue port_task
832 * @ap: The ata_port to queue port_task for
834 * Schedule @fn(@data) for execution after @delay jiffies using
835 * port_task. There is one port_task per port and it's the
836 * user(low level driver)'s responsibility to make sure that only
837 * one task is active at any given time.
839 * libata core layer takes care of synchronization between
840 * port_task and EH. ata_port_queue_task() may be ignored for EH
844 * Inherited from caller.
846 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
851 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
854 PREPARE_WORK(&ap
->port_task
, fn
, data
);
857 rc
= queue_work(ata_wq
, &ap
->port_task
);
859 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
861 /* rc == 0 means that another user is using port task */
866 * ata_port_flush_task - Flush port_task
867 * @ap: The ata_port to flush port_task for
869 * After this function completes, port_task is guranteed not to
870 * be running or scheduled.
873 * Kernel thread context (may sleep)
875 void ata_port_flush_task(struct ata_port
*ap
)
881 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
882 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
883 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
885 DPRINTK("flush #1\n");
886 flush_workqueue(ata_wq
);
889 * At this point, if a task is running, it's guaranteed to see
890 * the FLUSH flag; thus, it will never queue pio tasks again.
893 if (!cancel_delayed_work(&ap
->port_task
)) {
894 DPRINTK("flush #2\n");
895 flush_workqueue(ata_wq
);
898 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
899 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
900 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
905 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
907 struct completion
*waiting
= qc
->private_data
;
909 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
914 * ata_exec_internal - execute libata internal command
915 * @ap: Port to which the command is sent
916 * @dev: Device to which the command is sent
917 * @tf: Taskfile registers for the command and the result
918 * @dma_dir: Data tranfer direction of the command
919 * @buf: Data buffer of the command
920 * @buflen: Length of data buffer
922 * Executes libata internal command with timeout. @tf contains
923 * command on entry and result on return. Timeout and error
924 * conditions are reported via return value. No recovery action
925 * is taken after a command times out. It's caller's duty to
926 * clean up after timeout.
929 * None. Should be called with kernel context, might sleep.
933 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
934 struct ata_taskfile
*tf
,
935 int dma_dir
, void *buf
, unsigned int buflen
)
937 u8 command
= tf
->command
;
938 struct ata_queued_cmd
*qc
;
939 DECLARE_COMPLETION(wait
);
941 unsigned int err_mask
;
943 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
945 qc
= ata_qc_new_init(ap
, dev
);
949 qc
->dma_dir
= dma_dir
;
950 if (dma_dir
!= DMA_NONE
) {
951 ata_sg_init_one(qc
, buf
, buflen
);
952 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
955 qc
->private_data
= &wait
;
956 qc
->complete_fn
= ata_qc_complete_internal
;
958 qc
->err_mask
= ata_qc_issue(qc
);
962 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
964 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
965 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
967 /* We're racing with irq here. If we lose, the
968 * following test prevents us from completing the qc
969 * again. If completion irq occurs after here but
970 * before the caller cleans up, it will result in a
971 * spurious interrupt. We can live with that.
973 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
974 qc
->err_mask
= AC_ERR_TIMEOUT
;
976 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
980 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
984 err_mask
= qc
->err_mask
;
992 * ata_pio_need_iordy - check if iordy needed
995 * Check if the current speed of the device requires IORDY. Used
996 * by various controllers for chip configuration.
999 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1002 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1009 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1011 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1012 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1013 /* Is the speed faster than the drive allows non IORDY ? */
1015 /* This is cycle times not frequency - watch the logic! */
1016 if (pio
> 240) /* PIO2 is 240nS per cycle */
1025 * ata_dev_read_id - Read ID data from the specified device
1026 * @ap: port on which target device resides
1027 * @dev: target device
1028 * @p_class: pointer to class of the target device (may be changed)
1029 * @post_reset: is this read ID post-reset?
1030 * @p_id: read IDENTIFY page (newly allocated)
1032 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1033 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1034 * devices. This function also takes care of EDD signature
1035 * misreporting (to be removed once EDD support is gone) and
1036 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1039 * Kernel thread context (may sleep)
1042 * 0 on success, -errno otherwise.
1044 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1045 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1047 unsigned int class = *p_class
;
1048 unsigned int using_edd
;
1049 struct ata_taskfile tf
;
1050 unsigned int err_mask
= 0;
1055 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1057 if (ap
->ops
->probe_reset
||
1058 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1063 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1065 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1068 reason
= "out of memory";
1073 ata_tf_init(ap
, &tf
, dev
->devno
);
1077 tf
.command
= ATA_CMD_ID_ATA
;
1080 tf
.command
= ATA_CMD_ID_ATAPI
;
1084 reason
= "unsupported class";
1088 tf
.protocol
= ATA_PROT_PIO
;
1090 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1091 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1095 reason
= "I/O error";
1097 if (err_mask
& ~AC_ERR_DEV
)
1101 * arg! EDD works for all test cases, but seems to return
1102 * the ATA signature for some ATAPI devices. Until the
1103 * reason for this is found and fixed, we fix up the mess
1104 * here. If IDENTIFY DEVICE returns command aborted
1105 * (as ATAPI devices do), then we issue an
1106 * IDENTIFY PACKET DEVICE.
1108 * ATA software reset (SRST, the default) does not appear
1109 * to have this problem.
1111 if ((using_edd
) && (class == ATA_DEV_ATA
)) {
1112 u8 err
= tf
.feature
;
1113 if (err
& ATA_ABORTED
) {
1114 class = ATA_DEV_ATAPI
;
1121 swap_buf_le16(id
, ATA_ID_WORDS
);
1124 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1126 reason
= "device reports illegal type";
1130 if (post_reset
&& class == ATA_DEV_ATA
) {
1132 * The exact sequence expected by certain pre-ATA4 drives is:
1135 * INITIALIZE DEVICE PARAMETERS
1137 * Some drives were very specific about that exact sequence.
1139 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1140 err_mask
= ata_dev_init_params(ap
, dev
);
1143 reason
= "INIT_DEV_PARAMS failed";
1147 /* current CHS translation info (id[53-58]) might be
1148 * changed. reread the identify device info.
1160 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1161 ap
->id
, dev
->devno
, reason
);
1166 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1167 struct ata_device
*dev
)
1169 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1173 * ata_dev_configure - Configure the specified ATA/ATAPI device
1174 * @ap: Port on which target device resides
1175 * @dev: Target device to configure
1176 * @print_info: Enable device info printout
1178 * Configure @dev according to @dev->id. Generic and low-level
1179 * driver specific fixups are also applied.
1182 * Kernel thread context (may sleep)
1185 * 0 on success, -errno otherwise
1187 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1190 const u16
*id
= dev
->id
;
1191 unsigned int xfer_mask
;
1194 if (!ata_dev_present(dev
)) {
1195 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1196 ap
->id
, dev
->devno
);
1200 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1202 /* print device capabilities */
1204 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1205 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1206 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1207 id
[84], id
[85], id
[86], id
[87], id
[88]);
1209 /* initialize to-be-configured parameters */
1211 dev
->max_sectors
= 0;
1219 * common ATA, ATAPI feature tests
1222 /* we require DMA support (bits 8 of word 49) */
1223 if (!ata_id_has_dma(id
)) {
1224 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1229 /* find max transfer mode; for printk only */
1230 xfer_mask
= ata_id_xfermask(id
);
1234 /* ATA-specific feature tests */
1235 if (dev
->class == ATA_DEV_ATA
) {
1236 dev
->n_sectors
= ata_id_n_sectors(id
);
1238 if (ata_id_has_lba(id
)) {
1239 const char *lba_desc
;
1242 dev
->flags
|= ATA_DFLAG_LBA
;
1243 if (ata_id_has_lba48(id
)) {
1244 dev
->flags
|= ATA_DFLAG_LBA48
;
1248 /* print device info to dmesg */
1250 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1251 "max %s, %Lu sectors: %s\n",
1253 ata_id_major_version(id
),
1254 ata_mode_string(xfer_mask
),
1255 (unsigned long long)dev
->n_sectors
,
1260 /* Default translation */
1261 dev
->cylinders
= id
[1];
1263 dev
->sectors
= id
[6];
1265 if (ata_id_current_chs_valid(id
)) {
1266 /* Current CHS translation is valid. */
1267 dev
->cylinders
= id
[54];
1268 dev
->heads
= id
[55];
1269 dev
->sectors
= id
[56];
1272 /* print device info to dmesg */
1274 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1275 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1277 ata_id_major_version(id
),
1278 ata_mode_string(xfer_mask
),
1279 (unsigned long long)dev
->n_sectors
,
1280 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1286 /* ATAPI-specific feature tests */
1287 else if (dev
->class == ATA_DEV_ATAPI
) {
1288 rc
= atapi_cdb_len(id
);
1289 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1290 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1294 dev
->cdb_len
= (unsigned int) rc
;
1296 /* print device info to dmesg */
1298 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1299 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1302 ap
->host
->max_cmd_len
= 0;
1303 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1304 ap
->host
->max_cmd_len
= max_t(unsigned int,
1305 ap
->host
->max_cmd_len
,
1306 ap
->device
[i
].cdb_len
);
1308 /* limit bridge transfers to udma5, 200 sectors */
1309 if (ata_dev_knobble(ap
, dev
)) {
1311 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1312 ap
->id
, dev
->devno
);
1313 ap
->udma_mask
&= ATA_UDMA5
;
1314 dev
->max_sectors
= ATA_MAX_SECTORS
;
1317 if (ap
->ops
->dev_config
)
1318 ap
->ops
->dev_config(ap
, dev
);
1320 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1324 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1325 ap
->id
, dev
->devno
);
1326 DPRINTK("EXIT, err\n");
1331 * ata_bus_probe - Reset and probe ATA bus
1334 * Master ATA bus probing function. Initiates a hardware-dependent
1335 * bus reset, then attempts to identify any devices found on
1339 * PCI/etc. bus probe sem.
1342 * Zero on success, non-zero on error.
1345 static int ata_bus_probe(struct ata_port
*ap
)
1347 unsigned int classes
[ATA_MAX_DEVICES
];
1348 unsigned int i
, rc
, found
= 0;
1352 /* reset and determine device classes */
1353 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1354 classes
[i
] = ATA_DEV_UNKNOWN
;
1356 if (ap
->ops
->probe_reset
) {
1357 rc
= ap
->ops
->probe_reset(ap
, classes
);
1359 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1363 ap
->ops
->phy_reset(ap
);
1365 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1366 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1367 classes
[i
] = ap
->device
[i
].class;
1372 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1373 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1374 classes
[i
] = ATA_DEV_NONE
;
1376 /* read IDENTIFY page and configure devices */
1377 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1378 struct ata_device
*dev
= &ap
->device
[i
];
1380 dev
->class = classes
[i
];
1382 if (!ata_dev_present(dev
))
1385 WARN_ON(dev
->id
!= NULL
);
1386 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1387 dev
->class = ATA_DEV_NONE
;
1391 if (ata_dev_configure(ap
, dev
, 1)) {
1392 dev
->class++; /* disable device */
1400 goto err_out_disable
;
1403 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1404 goto err_out_disable
;
1409 ap
->ops
->port_disable(ap
);
1414 * ata_port_probe - Mark port as enabled
1415 * @ap: Port for which we indicate enablement
1417 * Modify @ap data structure such that the system
1418 * thinks that the entire port is enabled.
1420 * LOCKING: host_set lock, or some other form of
1424 void ata_port_probe(struct ata_port
*ap
)
1426 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1430 * sata_print_link_status - Print SATA link status
1431 * @ap: SATA port to printk link status about
1433 * This function prints link speed and status of a SATA link.
1438 static void sata_print_link_status(struct ata_port
*ap
)
1443 if (!ap
->ops
->scr_read
)
1446 sstatus
= scr_read(ap
, SCR_STATUS
);
1448 if (sata_dev_present(ap
)) {
1449 tmp
= (sstatus
>> 4) & 0xf;
1452 else if (tmp
& (1 << 1))
1455 speed
= "<unknown>";
1456 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1457 ap
->id
, speed
, sstatus
);
1459 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1465 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1466 * @ap: SATA port associated with target SATA PHY.
1468 * This function issues commands to standard SATA Sxxx
1469 * PHY registers, to wake up the phy (and device), and
1470 * clear any reset condition.
1473 * PCI/etc. bus probe sem.
1476 void __sata_phy_reset(struct ata_port
*ap
)
1479 unsigned long timeout
= jiffies
+ (HZ
* 5);
1481 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1482 /* issue phy wake/reset */
1483 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1484 /* Couldn't find anything in SATA I/II specs, but
1485 * AHCI-1.1 10.4.2 says at least 1 ms. */
1488 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1490 /* wait for phy to become ready, if necessary */
1493 sstatus
= scr_read(ap
, SCR_STATUS
);
1494 if ((sstatus
& 0xf) != 1)
1496 } while (time_before(jiffies
, timeout
));
1498 /* print link status */
1499 sata_print_link_status(ap
);
1501 /* TODO: phy layer with polling, timeouts, etc. */
1502 if (sata_dev_present(ap
))
1505 ata_port_disable(ap
);
1507 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1510 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1511 ata_port_disable(ap
);
1515 ap
->cbl
= ATA_CBL_SATA
;
1519 * sata_phy_reset - Reset SATA bus.
1520 * @ap: SATA port associated with target SATA PHY.
1522 * This function resets the SATA bus, and then probes
1523 * the bus for devices.
1526 * PCI/etc. bus probe sem.
1529 void sata_phy_reset(struct ata_port
*ap
)
1531 __sata_phy_reset(ap
);
1532 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1538 * ata_port_disable - Disable port.
1539 * @ap: Port to be disabled.
1541 * Modify @ap data structure such that the system
1542 * thinks that the entire port is disabled, and should
1543 * never attempt to probe or communicate with devices
1546 * LOCKING: host_set lock, or some other form of
1550 void ata_port_disable(struct ata_port
*ap
)
1552 ap
->device
[0].class = ATA_DEV_NONE
;
1553 ap
->device
[1].class = ATA_DEV_NONE
;
1554 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1558 * This mode timing computation functionality is ported over from
1559 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1562 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1563 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1564 * for PIO 5, which is a nonstandard extension and UDMA6, which
1565 * is currently supported only by Maxtor drives.
1568 static const struct ata_timing ata_timing
[] = {
1570 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1571 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1572 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1573 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1575 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1576 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1577 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1579 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1581 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1582 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1583 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1585 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1586 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1587 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1589 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1590 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1591 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1593 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1594 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1595 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1597 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1602 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1603 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1605 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1607 q
->setup
= EZ(t
->setup
* 1000, T
);
1608 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1609 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1610 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1611 q
->active
= EZ(t
->active
* 1000, T
);
1612 q
->recover
= EZ(t
->recover
* 1000, T
);
1613 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1614 q
->udma
= EZ(t
->udma
* 1000, UT
);
1617 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1618 struct ata_timing
*m
, unsigned int what
)
1620 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1621 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1622 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1623 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1624 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1625 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1626 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1627 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1630 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1632 const struct ata_timing
*t
;
1634 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1635 if (t
->mode
== 0xFF)
1640 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1641 struct ata_timing
*t
, int T
, int UT
)
1643 const struct ata_timing
*s
;
1644 struct ata_timing p
;
1650 if (!(s
= ata_timing_find_mode(speed
)))
1653 memcpy(t
, s
, sizeof(*s
));
1656 * If the drive is an EIDE drive, it can tell us it needs extended
1657 * PIO/MW_DMA cycle timing.
1660 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1661 memset(&p
, 0, sizeof(p
));
1662 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1663 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1664 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1665 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1666 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1668 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1672 * Convert the timing to bus clock counts.
1675 ata_timing_quantize(t
, t
, T
, UT
);
1678 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1679 * S.M.A.R.T * and some other commands. We have to ensure that the
1680 * DMA cycle timing is slower/equal than the fastest PIO timing.
1683 if (speed
> XFER_PIO_4
) {
1684 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1685 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1689 * Lengthen active & recovery time so that cycle time is correct.
1692 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1693 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1694 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1697 if (t
->active
+ t
->recover
< t
->cycle
) {
1698 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1699 t
->recover
= t
->cycle
- t
->active
;
1705 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1707 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1710 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1711 dev
->flags
|= ATA_DFLAG_PIO
;
1713 ata_dev_set_xfermode(ap
, dev
);
1715 if (ata_dev_revalidate(ap
, dev
, 0)) {
1716 printk(KERN_ERR
"ata%u: failed to revalidate after set "
1717 "xfermode, disabled\n", ap
->id
);
1718 ata_port_disable(ap
);
1721 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1722 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1724 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1726 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1729 static int ata_host_set_pio(struct ata_port
*ap
)
1733 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1734 struct ata_device
*dev
= &ap
->device
[i
];
1736 if (!ata_dev_present(dev
))
1739 if (!dev
->pio_mode
) {
1740 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1744 dev
->xfer_mode
= dev
->pio_mode
;
1745 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1746 if (ap
->ops
->set_piomode
)
1747 ap
->ops
->set_piomode(ap
, dev
);
1753 static void ata_host_set_dma(struct ata_port
*ap
)
1757 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1758 struct ata_device
*dev
= &ap
->device
[i
];
1760 if (!ata_dev_present(dev
) || !dev
->dma_mode
)
1763 dev
->xfer_mode
= dev
->dma_mode
;
1764 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1765 if (ap
->ops
->set_dmamode
)
1766 ap
->ops
->set_dmamode(ap
, dev
);
1771 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1772 * @ap: port on which timings will be programmed
1774 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1777 * PCI/etc. bus probe sem.
1779 static void ata_set_mode(struct ata_port
*ap
)
1783 /* step 1: calculate xfer_mask */
1784 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1785 struct ata_device
*dev
= &ap
->device
[i
];
1786 unsigned int xfer_mask
;
1788 if (!ata_dev_present(dev
))
1791 xfer_mask
= ata_dev_xfermask(ap
, dev
);
1793 dev
->pio_mode
= ata_xfer_mask2mode(xfer_mask
& ATA_MASK_PIO
);
1794 dev
->dma_mode
= ata_xfer_mask2mode(xfer_mask
& (ATA_MASK_MWDMA
|
1798 /* step 2: always set host PIO timings */
1799 rc
= ata_host_set_pio(ap
);
1803 /* step 3: set host DMA timings */
1804 ata_host_set_dma(ap
);
1806 /* step 4: update devices' xfer mode */
1807 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1808 ata_dev_set_mode(ap
, &ap
->device
[i
]);
1810 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1813 if (ap
->ops
->post_set_mode
)
1814 ap
->ops
->post_set_mode(ap
);
1819 ata_port_disable(ap
);
1823 * ata_tf_to_host - issue ATA taskfile to host controller
1824 * @ap: port to which command is being issued
1825 * @tf: ATA taskfile register set
1827 * Issues ATA taskfile register set to ATA host controller,
1828 * with proper synchronization with interrupt handler and
1832 * spin_lock_irqsave(host_set lock)
1835 static inline void ata_tf_to_host(struct ata_port
*ap
,
1836 const struct ata_taskfile
*tf
)
1838 ap
->ops
->tf_load(ap
, tf
);
1839 ap
->ops
->exec_command(ap
, tf
);
1843 * ata_busy_sleep - sleep until BSY clears, or timeout
1844 * @ap: port containing status register to be polled
1845 * @tmout_pat: impatience timeout
1846 * @tmout: overall timeout
1848 * Sleep until ATA Status register bit BSY clears,
1849 * or a timeout occurs.
1854 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1855 unsigned long tmout_pat
, unsigned long tmout
)
1857 unsigned long timer_start
, timeout
;
1860 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1861 timer_start
= jiffies
;
1862 timeout
= timer_start
+ tmout_pat
;
1863 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1865 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1868 if (status
& ATA_BUSY
)
1869 printk(KERN_WARNING
"ata%u is slow to respond, "
1870 "please be patient\n", ap
->id
);
1872 timeout
= timer_start
+ tmout
;
1873 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1875 status
= ata_chk_status(ap
);
1878 if (status
& ATA_BUSY
) {
1879 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1880 ap
->id
, tmout
/ HZ
);
1887 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1889 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1890 unsigned int dev0
= devmask
& (1 << 0);
1891 unsigned int dev1
= devmask
& (1 << 1);
1892 unsigned long timeout
;
1894 /* if device 0 was found in ata_devchk, wait for its
1898 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1900 /* if device 1 was found in ata_devchk, wait for
1901 * register access, then wait for BSY to clear
1903 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1907 ap
->ops
->dev_select(ap
, 1);
1908 if (ap
->flags
& ATA_FLAG_MMIO
) {
1909 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1910 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1912 nsect
= inb(ioaddr
->nsect_addr
);
1913 lbal
= inb(ioaddr
->lbal_addr
);
1915 if ((nsect
== 1) && (lbal
== 1))
1917 if (time_after(jiffies
, timeout
)) {
1921 msleep(50); /* give drive a breather */
1924 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1926 /* is all this really necessary? */
1927 ap
->ops
->dev_select(ap
, 0);
1929 ap
->ops
->dev_select(ap
, 1);
1931 ap
->ops
->dev_select(ap
, 0);
1935 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1936 * @ap: Port to reset and probe
1938 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1939 * probe the bus. Not often used these days.
1942 * PCI/etc. bus probe sem.
1943 * Obtains host_set lock.
1947 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1949 struct ata_taskfile tf
;
1950 unsigned long flags
;
1952 /* set up execute-device-diag (bus reset) taskfile */
1953 /* also, take interrupts to a known state (disabled) */
1954 DPRINTK("execute-device-diag\n");
1955 ata_tf_init(ap
, &tf
, 0);
1957 tf
.command
= ATA_CMD_EDD
;
1958 tf
.protocol
= ATA_PROT_NODATA
;
1961 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1962 ata_tf_to_host(ap
, &tf
);
1963 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1965 /* spec says at least 2ms. but who knows with those
1966 * crazy ATAPI devices...
1970 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1973 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1974 unsigned int devmask
)
1976 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1978 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1980 /* software reset. causes dev0 to be selected */
1981 if (ap
->flags
& ATA_FLAG_MMIO
) {
1982 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1983 udelay(20); /* FIXME: flush */
1984 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1985 udelay(20); /* FIXME: flush */
1986 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1988 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1990 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1992 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1995 /* spec mandates ">= 2ms" before checking status.
1996 * We wait 150ms, because that was the magic delay used for
1997 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1998 * between when the ATA command register is written, and then
1999 * status is checked. Because waiting for "a while" before
2000 * checking status is fine, post SRST, we perform this magic
2001 * delay here as well.
2005 ata_bus_post_reset(ap
, devmask
);
2011 * ata_bus_reset - reset host port and associated ATA channel
2012 * @ap: port to reset
2014 * This is typically the first time we actually start issuing
2015 * commands to the ATA channel. We wait for BSY to clear, then
2016 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2017 * result. Determine what devices, if any, are on the channel
2018 * by looking at the device 0/1 error register. Look at the signature
2019 * stored in each device's taskfile registers, to determine if
2020 * the device is ATA or ATAPI.
2023 * PCI/etc. bus probe sem.
2024 * Obtains host_set lock.
2027 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2030 void ata_bus_reset(struct ata_port
*ap
)
2032 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2033 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2035 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2037 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2039 /* determine if device 0/1 are present */
2040 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2043 dev0
= ata_devchk(ap
, 0);
2045 dev1
= ata_devchk(ap
, 1);
2049 devmask
|= (1 << 0);
2051 devmask
|= (1 << 1);
2053 /* select device 0 again */
2054 ap
->ops
->dev_select(ap
, 0);
2056 /* issue bus reset */
2057 if (ap
->flags
& ATA_FLAG_SRST
)
2058 rc
= ata_bus_softreset(ap
, devmask
);
2059 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2060 /* set up device control */
2061 if (ap
->flags
& ATA_FLAG_MMIO
)
2062 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2064 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2065 rc
= ata_bus_edd(ap
);
2072 * determine by signature whether we have ATA or ATAPI devices
2074 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2075 if ((slave_possible
) && (err
!= 0x81))
2076 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2078 /* re-enable interrupts */
2079 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2082 /* is double-select really necessary? */
2083 if (ap
->device
[1].class != ATA_DEV_NONE
)
2084 ap
->ops
->dev_select(ap
, 1);
2085 if (ap
->device
[0].class != ATA_DEV_NONE
)
2086 ap
->ops
->dev_select(ap
, 0);
2088 /* if no devices were detected, disable this port */
2089 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2090 (ap
->device
[1].class == ATA_DEV_NONE
))
2093 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2094 /* set up device control for ATA_FLAG_SATA_RESET */
2095 if (ap
->flags
& ATA_FLAG_MMIO
)
2096 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2098 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2105 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2106 ap
->ops
->port_disable(ap
);
2111 static int sata_phy_resume(struct ata_port
*ap
)
2113 unsigned long timeout
= jiffies
+ (HZ
* 5);
2116 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2118 /* Wait for phy to become ready, if necessary. */
2121 sstatus
= scr_read(ap
, SCR_STATUS
);
2122 if ((sstatus
& 0xf) != 1)
2124 } while (time_before(jiffies
, timeout
));
2130 * ata_std_probeinit - initialize probing
2131 * @ap: port to be probed
2133 * @ap is about to be probed. Initialize it. This function is
2134 * to be used as standard callback for ata_drive_probe_reset().
2136 * NOTE!!! Do not use this function as probeinit if a low level
2137 * driver implements only hardreset. Just pass NULL as probeinit
2138 * in that case. Using this function is probably okay but doing
2139 * so makes reset sequence different from the original
2140 * ->phy_reset implementation and Jeff nervous. :-P
2142 extern void ata_std_probeinit(struct ata_port
*ap
)
2144 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2145 sata_phy_resume(ap
);
2146 if (sata_dev_present(ap
))
2147 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2152 * ata_std_softreset - reset host port via ATA SRST
2153 * @ap: port to reset
2154 * @verbose: fail verbosely
2155 * @classes: resulting classes of attached devices
2157 * Reset host port using ATA SRST. This function is to be used
2158 * as standard callback for ata_drive_*_reset() functions.
2161 * Kernel thread context (may sleep)
2164 * 0 on success, -errno otherwise.
2166 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2168 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2169 unsigned int devmask
= 0, err_mask
;
2174 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2175 classes
[0] = ATA_DEV_NONE
;
2179 /* determine if device 0/1 are present */
2180 if (ata_devchk(ap
, 0))
2181 devmask
|= (1 << 0);
2182 if (slave_possible
&& ata_devchk(ap
, 1))
2183 devmask
|= (1 << 1);
2185 /* select device 0 again */
2186 ap
->ops
->dev_select(ap
, 0);
2188 /* issue bus reset */
2189 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2190 err_mask
= ata_bus_softreset(ap
, devmask
);
2193 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2196 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2201 /* determine by signature whether we have ATA or ATAPI devices */
2202 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2203 if (slave_possible
&& err
!= 0x81)
2204 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2207 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2212 * sata_std_hardreset - reset host port via SATA phy reset
2213 * @ap: port to reset
2214 * @verbose: fail verbosely
2215 * @class: resulting class of attached device
2217 * SATA phy-reset host port using DET bits of SControl register.
2218 * This function is to be used as standard callback for
2219 * ata_drive_*_reset().
2222 * Kernel thread context (may sleep)
2225 * 0 on success, -errno otherwise.
2227 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2231 /* Issue phy wake/reset */
2232 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2235 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2236 * 10.4.2 says at least 1 ms.
2240 /* Bring phy back */
2241 sata_phy_resume(ap
);
2243 /* TODO: phy layer with polling, timeouts, etc. */
2244 if (!sata_dev_present(ap
)) {
2245 *class = ATA_DEV_NONE
;
2246 DPRINTK("EXIT, link offline\n");
2250 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2252 printk(KERN_ERR
"ata%u: COMRESET failed "
2253 "(device not ready)\n", ap
->id
);
2255 DPRINTK("EXIT, device not ready\n");
2259 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2261 *class = ata_dev_try_classify(ap
, 0, NULL
);
2263 DPRINTK("EXIT, class=%u\n", *class);
2268 * ata_std_postreset - standard postreset callback
2269 * @ap: the target ata_port
2270 * @classes: classes of attached devices
2272 * This function is invoked after a successful reset. Note that
2273 * the device might have been reset more than once using
2274 * different reset methods before postreset is invoked.
2276 * This function is to be used as standard callback for
2277 * ata_drive_*_reset().
2280 * Kernel thread context (may sleep)
2282 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2286 /* set cable type if it isn't already set */
2287 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2288 ap
->cbl
= ATA_CBL_SATA
;
2290 /* print link status */
2291 if (ap
->cbl
== ATA_CBL_SATA
)
2292 sata_print_link_status(ap
);
2294 /* re-enable interrupts */
2295 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2298 /* is double-select really necessary? */
2299 if (classes
[0] != ATA_DEV_NONE
)
2300 ap
->ops
->dev_select(ap
, 1);
2301 if (classes
[1] != ATA_DEV_NONE
)
2302 ap
->ops
->dev_select(ap
, 0);
2304 /* bail out if no device is present */
2305 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2306 DPRINTK("EXIT, no device\n");
2310 /* set up device control */
2311 if (ap
->ioaddr
.ctl_addr
) {
2312 if (ap
->flags
& ATA_FLAG_MMIO
)
2313 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2315 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2322 * ata_std_probe_reset - standard probe reset method
2323 * @ap: prot to perform probe-reset
2324 * @classes: resulting classes of attached devices
2326 * The stock off-the-shelf ->probe_reset method.
2329 * Kernel thread context (may sleep)
2332 * 0 on success, -errno otherwise.
2334 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2336 ata_reset_fn_t hardreset
;
2339 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2340 hardreset
= sata_std_hardreset
;
2342 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2343 ata_std_softreset
, hardreset
,
2344 ata_std_postreset
, classes
);
2347 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2348 ata_postreset_fn_t postreset
,
2349 unsigned int *classes
)
2353 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2354 classes
[i
] = ATA_DEV_UNKNOWN
;
2356 rc
= reset(ap
, 0, classes
);
2360 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2361 * is complete and convert all ATA_DEV_UNKNOWN to
2364 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2365 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2368 if (i
< ATA_MAX_DEVICES
)
2369 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2370 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2371 classes
[i
] = ATA_DEV_NONE
;
2374 postreset(ap
, classes
);
2376 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2380 * ata_drive_probe_reset - Perform probe reset with given methods
2381 * @ap: port to reset
2382 * @probeinit: probeinit method (can be NULL)
2383 * @softreset: softreset method (can be NULL)
2384 * @hardreset: hardreset method (can be NULL)
2385 * @postreset: postreset method (can be NULL)
2386 * @classes: resulting classes of attached devices
2388 * Reset the specified port and classify attached devices using
2389 * given methods. This function prefers softreset but tries all
2390 * possible reset sequences to reset and classify devices. This
2391 * function is intended to be used for constructing ->probe_reset
2392 * callback by low level drivers.
2394 * Reset methods should follow the following rules.
2396 * - Return 0 on sucess, -errno on failure.
2397 * - If classification is supported, fill classes[] with
2398 * recognized class codes.
2399 * - If classification is not supported, leave classes[] alone.
2400 * - If verbose is non-zero, print error message on failure;
2401 * otherwise, shut up.
2404 * Kernel thread context (may sleep)
2407 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2408 * if classification fails, and any error code from reset
2411 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2412 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2413 ata_postreset_fn_t postreset
, unsigned int *classes
)
2421 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2429 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2430 if (rc
== 0 || rc
!= -ENODEV
)
2434 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2440 * ata_dev_same_device - Determine whether new ID matches configured device
2441 * @ap: port on which the device to compare against resides
2442 * @dev: device to compare against
2443 * @new_class: class of the new device
2444 * @new_id: IDENTIFY page of the new device
2446 * Compare @new_class and @new_id against @dev and determine
2447 * whether @dev is the device indicated by @new_class and
2454 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2456 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2457 unsigned int new_class
, const u16
*new_id
)
2459 const u16
*old_id
= dev
->id
;
2460 unsigned char model
[2][41], serial
[2][21];
2463 if (dev
->class != new_class
) {
2465 "ata%u: dev %u class mismatch %d != %d\n",
2466 ap
->id
, dev
->devno
, dev
->class, new_class
);
2470 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2471 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2472 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2473 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2474 new_n_sectors
= ata_id_n_sectors(new_id
);
2476 if (strcmp(model
[0], model
[1])) {
2478 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2479 ap
->id
, dev
->devno
, model
[0], model
[1]);
2483 if (strcmp(serial
[0], serial
[1])) {
2485 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2486 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2490 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2492 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2493 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2494 (unsigned long long)new_n_sectors
);
2502 * ata_dev_revalidate - Revalidate ATA device
2503 * @ap: port on which the device to revalidate resides
2504 * @dev: device to revalidate
2505 * @post_reset: is this revalidation after reset?
2507 * Re-read IDENTIFY page and make sure @dev is still attached to
2511 * Kernel thread context (may sleep)
2514 * 0 on success, negative errno otherwise
2516 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2523 if (!ata_dev_present(dev
))
2529 /* allocate & read ID data */
2530 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2534 /* is the device still there? */
2535 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2543 /* configure device according to the new ID */
2544 return ata_dev_configure(ap
, dev
, 0);
2547 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2548 ap
->id
, dev
->devno
, rc
);
2553 static const char * const ata_dma_blacklist
[] = {
2572 "Toshiba CD-ROM XM-6202B",
2573 "TOSHIBA CD-ROM XM-1702BC",
2575 "E-IDE CD-ROM CR-840",
2578 "SAMSUNG CD-ROM SC-148C",
2579 "SAMSUNG CD-ROM SC",
2581 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2585 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2587 unsigned char model_num
[41];
2590 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2592 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2593 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2600 * ata_dev_xfermask - Compute supported xfermask of the given device
2601 * @ap: Port on which the device to compute xfermask for resides
2602 * @dev: Device to compute xfermask for
2604 * Compute supported xfermask of @dev. This function is
2605 * responsible for applying all known limits including host
2606 * controller limits, device blacklist, etc...
2612 * Computed xfermask.
2614 static unsigned int ata_dev_xfermask(struct ata_port
*ap
,
2615 struct ata_device
*dev
)
2617 unsigned long xfer_mask
;
2620 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2623 /* use port-wide xfermask for now */
2624 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2625 struct ata_device
*d
= &ap
->device
[i
];
2626 if (!ata_dev_present(d
))
2628 xfer_mask
&= ata_id_xfermask(d
->id
);
2629 if (ata_dma_blacklisted(d
))
2630 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2633 if (ata_dma_blacklisted(dev
))
2634 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2635 "disabling DMA\n", ap
->id
, dev
->devno
);
2641 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2642 * @ap: Port associated with device @dev
2643 * @dev: Device to which command will be sent
2645 * Issue SET FEATURES - XFER MODE command to device @dev
2649 * PCI/etc. bus probe sem.
2652 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2654 struct ata_taskfile tf
;
2656 /* set up set-features taskfile */
2657 DPRINTK("set features - xfer mode\n");
2659 ata_tf_init(ap
, &tf
, dev
->devno
);
2660 tf
.command
= ATA_CMD_SET_FEATURES
;
2661 tf
.feature
= SETFEATURES_XFER
;
2662 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2663 tf
.protocol
= ATA_PROT_NODATA
;
2664 tf
.nsect
= dev
->xfer_mode
;
2666 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2667 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2669 ata_port_disable(ap
);
2676 * ata_dev_init_params - Issue INIT DEV PARAMS command
2677 * @ap: Port associated with device @dev
2678 * @dev: Device to which command will be sent
2681 * Kernel thread context (may sleep)
2684 * 0 on success, AC_ERR_* mask otherwise.
2687 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2688 struct ata_device
*dev
)
2690 struct ata_taskfile tf
;
2691 unsigned int err_mask
;
2692 u16 sectors
= dev
->id
[6];
2693 u16 heads
= dev
->id
[3];
2695 /* Number of sectors per track 1-255. Number of heads 1-16 */
2696 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2699 /* set up init dev params taskfile */
2700 DPRINTK("init dev params \n");
2702 ata_tf_init(ap
, &tf
, dev
->devno
);
2703 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2704 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2705 tf
.protocol
= ATA_PROT_NODATA
;
2707 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2709 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2711 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2716 * ata_sg_clean - Unmap DMA memory associated with command
2717 * @qc: Command containing DMA memory to be released
2719 * Unmap all mapped DMA memory associated with this command.
2722 * spin_lock_irqsave(host_set lock)
2725 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2727 struct ata_port
*ap
= qc
->ap
;
2728 struct scatterlist
*sg
= qc
->__sg
;
2729 int dir
= qc
->dma_dir
;
2730 void *pad_buf
= NULL
;
2732 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2733 WARN_ON(sg
== NULL
);
2735 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2736 WARN_ON(qc
->n_elem
> 1);
2738 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2740 /* if we padded the buffer out to 32-bit bound, and data
2741 * xfer direction is from-device, we must copy from the
2742 * pad buffer back into the supplied buffer
2744 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2745 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2747 if (qc
->flags
& ATA_QCFLAG_SG
) {
2749 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2750 /* restore last sg */
2751 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2753 struct scatterlist
*psg
= &qc
->pad_sgent
;
2754 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2755 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2756 kunmap_atomic(addr
, KM_IRQ0
);
2760 dma_unmap_single(ap
->host_set
->dev
,
2761 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2764 sg
->length
+= qc
->pad_len
;
2766 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2767 pad_buf
, qc
->pad_len
);
2770 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2775 * ata_fill_sg - Fill PCI IDE PRD table
2776 * @qc: Metadata associated with taskfile to be transferred
2778 * Fill PCI IDE PRD (scatter-gather) table with segments
2779 * associated with the current disk command.
2782 * spin_lock_irqsave(host_set lock)
2785 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2787 struct ata_port
*ap
= qc
->ap
;
2788 struct scatterlist
*sg
;
2791 WARN_ON(qc
->__sg
== NULL
);
2792 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2795 ata_for_each_sg(sg
, qc
) {
2799 /* determine if physical DMA addr spans 64K boundary.
2800 * Note h/w doesn't support 64-bit, so we unconditionally
2801 * truncate dma_addr_t to u32.
2803 addr
= (u32
) sg_dma_address(sg
);
2804 sg_len
= sg_dma_len(sg
);
2807 offset
= addr
& 0xffff;
2809 if ((offset
+ sg_len
) > 0x10000)
2810 len
= 0x10000 - offset
;
2812 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2813 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2814 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2823 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2826 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2827 * @qc: Metadata associated with taskfile to check
2829 * Allow low-level driver to filter ATA PACKET commands, returning
2830 * a status indicating whether or not it is OK to use DMA for the
2831 * supplied PACKET command.
2834 * spin_lock_irqsave(host_set lock)
2836 * RETURNS: 0 when ATAPI DMA can be used
2839 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2841 struct ata_port
*ap
= qc
->ap
;
2842 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2844 if (ap
->ops
->check_atapi_dma
)
2845 rc
= ap
->ops
->check_atapi_dma(qc
);
2850 * ata_qc_prep - Prepare taskfile for submission
2851 * @qc: Metadata associated with taskfile to be prepared
2853 * Prepare ATA taskfile for submission.
2856 * spin_lock_irqsave(host_set lock)
2858 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2860 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2867 * ata_sg_init_one - Associate command with memory buffer
2868 * @qc: Command to be associated
2869 * @buf: Memory buffer
2870 * @buflen: Length of memory buffer, in bytes.
2872 * Initialize the data-related elements of queued_cmd @qc
2873 * to point to a single memory buffer, @buf of byte length @buflen.
2876 * spin_lock_irqsave(host_set lock)
2879 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2881 struct scatterlist
*sg
;
2883 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2885 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2886 qc
->__sg
= &qc
->sgent
;
2888 qc
->orig_n_elem
= 1;
2892 sg_init_one(sg
, buf
, buflen
);
2896 * ata_sg_init - Associate command with scatter-gather table.
2897 * @qc: Command to be associated
2898 * @sg: Scatter-gather table.
2899 * @n_elem: Number of elements in s/g table.
2901 * Initialize the data-related elements of queued_cmd @qc
2902 * to point to a scatter-gather table @sg, containing @n_elem
2906 * spin_lock_irqsave(host_set lock)
2909 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2910 unsigned int n_elem
)
2912 qc
->flags
|= ATA_QCFLAG_SG
;
2914 qc
->n_elem
= n_elem
;
2915 qc
->orig_n_elem
= n_elem
;
2919 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2920 * @qc: Command with memory buffer to be mapped.
2922 * DMA-map the memory buffer associated with queued_cmd @qc.
2925 * spin_lock_irqsave(host_set lock)
2928 * Zero on success, negative on error.
2931 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2933 struct ata_port
*ap
= qc
->ap
;
2934 int dir
= qc
->dma_dir
;
2935 struct scatterlist
*sg
= qc
->__sg
;
2936 dma_addr_t dma_address
;
2939 /* we must lengthen transfers to end on a 32-bit boundary */
2940 qc
->pad_len
= sg
->length
& 3;
2942 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2943 struct scatterlist
*psg
= &qc
->pad_sgent
;
2945 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2947 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2949 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2950 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2953 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2954 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2956 sg
->length
-= qc
->pad_len
;
2957 if (sg
->length
== 0)
2960 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2961 sg
->length
, qc
->pad_len
);
2969 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2971 if (dma_mapping_error(dma_address
)) {
2973 sg
->length
+= qc
->pad_len
;
2977 sg_dma_address(sg
) = dma_address
;
2978 sg_dma_len(sg
) = sg
->length
;
2981 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2982 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2988 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2989 * @qc: Command with scatter-gather table to be mapped.
2991 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2994 * spin_lock_irqsave(host_set lock)
2997 * Zero on success, negative on error.
3001 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3003 struct ata_port
*ap
= qc
->ap
;
3004 struct scatterlist
*sg
= qc
->__sg
;
3005 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3006 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3008 VPRINTK("ENTER, ata%u\n", ap
->id
);
3009 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3011 /* we must lengthen transfers to end on a 32-bit boundary */
3012 qc
->pad_len
= lsg
->length
& 3;
3014 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3015 struct scatterlist
*psg
= &qc
->pad_sgent
;
3016 unsigned int offset
;
3018 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3020 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3023 * psg->page/offset are used to copy to-be-written
3024 * data in this function or read data in ata_sg_clean.
3026 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3027 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3028 psg
->offset
= offset_in_page(offset
);
3030 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3031 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3032 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3033 kunmap_atomic(addr
, KM_IRQ0
);
3036 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3037 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3039 lsg
->length
-= qc
->pad_len
;
3040 if (lsg
->length
== 0)
3043 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3044 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3047 pre_n_elem
= qc
->n_elem
;
3048 if (trim_sg
&& pre_n_elem
)
3057 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
3059 /* restore last sg */
3060 lsg
->length
+= qc
->pad_len
;
3064 DPRINTK("%d sg elements mapped\n", n_elem
);
3067 qc
->n_elem
= n_elem
;
3073 * ata_poll_qc_complete - turn irq back on and finish qc
3074 * @qc: Command to complete
3075 * @err_mask: ATA status register content
3078 * None. (grabs host lock)
3081 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3083 struct ata_port
*ap
= qc
->ap
;
3084 unsigned long flags
;
3086 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3087 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3089 ata_qc_complete(qc
);
3090 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3094 * ata_pio_poll - poll using PIO, depending on current state
3095 * @ap: the target ata_port
3098 * None. (executing in kernel thread context)
3101 * timeout value to use
3104 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3106 struct ata_queued_cmd
*qc
;
3108 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3109 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3111 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3112 WARN_ON(qc
== NULL
);
3114 switch (ap
->hsm_task_state
) {
3117 poll_state
= HSM_ST_POLL
;
3121 case HSM_ST_LAST_POLL
:
3122 poll_state
= HSM_ST_LAST_POLL
;
3123 reg_state
= HSM_ST_LAST
;
3130 status
= ata_chk_status(ap
);
3131 if (status
& ATA_BUSY
) {
3132 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3133 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3134 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3137 ap
->hsm_task_state
= poll_state
;
3138 return ATA_SHORT_PAUSE
;
3141 ap
->hsm_task_state
= reg_state
;
3146 * ata_pio_complete - check if drive is busy or idle
3147 * @ap: the target ata_port
3150 * None. (executing in kernel thread context)
3153 * Non-zero if qc completed, zero otherwise.
3156 static int ata_pio_complete (struct ata_port
*ap
)
3158 struct ata_queued_cmd
*qc
;
3162 * This is purely heuristic. This is a fast path. Sometimes when
3163 * we enter, BSY will be cleared in a chk-status or two. If not,
3164 * the drive is probably seeking or something. Snooze for a couple
3165 * msecs, then chk-status again. If still busy, fall back to
3166 * HSM_ST_POLL state.
3168 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3169 if (drv_stat
& ATA_BUSY
) {
3171 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3172 if (drv_stat
& ATA_BUSY
) {
3173 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3174 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3179 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3180 WARN_ON(qc
== NULL
);
3182 drv_stat
= ata_wait_idle(ap
);
3183 if (!ata_ok(drv_stat
)) {
3184 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3185 ap
->hsm_task_state
= HSM_ST_ERR
;
3189 ap
->hsm_task_state
= HSM_ST_IDLE
;
3191 WARN_ON(qc
->err_mask
);
3192 ata_poll_qc_complete(qc
);
3194 /* another command may start at this point */
3201 * swap_buf_le16 - swap halves of 16-bit words in place
3202 * @buf: Buffer to swap
3203 * @buf_words: Number of 16-bit words in buffer.
3205 * Swap halves of 16-bit words if needed to convert from
3206 * little-endian byte order to native cpu byte order, or
3210 * Inherited from caller.
3212 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3217 for (i
= 0; i
< buf_words
; i
++)
3218 buf
[i
] = le16_to_cpu(buf
[i
]);
3219 #endif /* __BIG_ENDIAN */
3223 * ata_mmio_data_xfer - Transfer data by MMIO
3224 * @ap: port to read/write
3226 * @buflen: buffer length
3227 * @write_data: read/write
3229 * Transfer data from/to the device data register by MMIO.
3232 * Inherited from caller.
3235 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3236 unsigned int buflen
, int write_data
)
3239 unsigned int words
= buflen
>> 1;
3240 u16
*buf16
= (u16
*) buf
;
3241 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3243 /* Transfer multiple of 2 bytes */
3245 for (i
= 0; i
< words
; i
++)
3246 writew(le16_to_cpu(buf16
[i
]), mmio
);
3248 for (i
= 0; i
< words
; i
++)
3249 buf16
[i
] = cpu_to_le16(readw(mmio
));
3252 /* Transfer trailing 1 byte, if any. */
3253 if (unlikely(buflen
& 0x01)) {
3254 u16 align_buf
[1] = { 0 };
3255 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3258 memcpy(align_buf
, trailing_buf
, 1);
3259 writew(le16_to_cpu(align_buf
[0]), mmio
);
3261 align_buf
[0] = cpu_to_le16(readw(mmio
));
3262 memcpy(trailing_buf
, align_buf
, 1);
3268 * ata_pio_data_xfer - Transfer data by PIO
3269 * @ap: port to read/write
3271 * @buflen: buffer length
3272 * @write_data: read/write
3274 * Transfer data from/to the device data register by PIO.
3277 * Inherited from caller.
3280 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3281 unsigned int buflen
, int write_data
)
3283 unsigned int words
= buflen
>> 1;
3285 /* Transfer multiple of 2 bytes */
3287 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3289 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3291 /* Transfer trailing 1 byte, if any. */
3292 if (unlikely(buflen
& 0x01)) {
3293 u16 align_buf
[1] = { 0 };
3294 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3297 memcpy(align_buf
, trailing_buf
, 1);
3298 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3300 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3301 memcpy(trailing_buf
, align_buf
, 1);
3307 * ata_data_xfer - Transfer data from/to the data register.
3308 * @ap: port to read/write
3310 * @buflen: buffer length
3311 * @do_write: read/write
3313 * Transfer data from/to the device data register.
3316 * Inherited from caller.
3319 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3320 unsigned int buflen
, int do_write
)
3322 /* Make the crap hardware pay the costs not the good stuff */
3323 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3324 unsigned long flags
;
3325 local_irq_save(flags
);
3326 if (ap
->flags
& ATA_FLAG_MMIO
)
3327 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3329 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3330 local_irq_restore(flags
);
3332 if (ap
->flags
& ATA_FLAG_MMIO
)
3333 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3335 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3340 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3341 * @qc: Command on going
3343 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3346 * Inherited from caller.
3349 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3351 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3352 struct scatterlist
*sg
= qc
->__sg
;
3353 struct ata_port
*ap
= qc
->ap
;
3355 unsigned int offset
;
3358 if (qc
->cursect
== (qc
->nsect
- 1))
3359 ap
->hsm_task_state
= HSM_ST_LAST
;
3361 page
= sg
[qc
->cursg
].page
;
3362 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3364 /* get the current page and offset */
3365 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3366 offset
%= PAGE_SIZE
;
3368 buf
= kmap(page
) + offset
;
3373 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3378 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3380 /* do the actual data transfer */
3381 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3382 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3388 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3389 * @qc: Command on going
3390 * @bytes: number of bytes
3392 * Transfer Transfer data from/to the ATAPI device.
3395 * Inherited from caller.
3399 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3401 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3402 struct scatterlist
*sg
= qc
->__sg
;
3403 struct ata_port
*ap
= qc
->ap
;
3406 unsigned int offset
, count
;
3408 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3409 ap
->hsm_task_state
= HSM_ST_LAST
;
3412 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3414 * The end of qc->sg is reached and the device expects
3415 * more data to transfer. In order not to overrun qc->sg
3416 * and fulfill length specified in the byte count register,
3417 * - for read case, discard trailing data from the device
3418 * - for write case, padding zero data to the device
3420 u16 pad_buf
[1] = { 0 };
3421 unsigned int words
= bytes
>> 1;
3424 if (words
) /* warning if bytes > 1 */
3425 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3428 for (i
= 0; i
< words
; i
++)
3429 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3431 ap
->hsm_task_state
= HSM_ST_LAST
;
3435 sg
= &qc
->__sg
[qc
->cursg
];
3438 offset
= sg
->offset
+ qc
->cursg_ofs
;
3440 /* get the current page and offset */
3441 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3442 offset
%= PAGE_SIZE
;
3444 /* don't overrun current sg */
3445 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3447 /* don't cross page boundaries */
3448 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3450 buf
= kmap(page
) + offset
;
3453 qc
->curbytes
+= count
;
3454 qc
->cursg_ofs
+= count
;
3456 if (qc
->cursg_ofs
== sg
->length
) {
3461 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3463 /* do the actual data transfer */
3464 ata_data_xfer(ap
, buf
, count
, do_write
);
3473 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3474 * @qc: Command on going
3476 * Transfer Transfer data from/to the ATAPI device.
3479 * Inherited from caller.
3482 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3484 struct ata_port
*ap
= qc
->ap
;
3485 struct ata_device
*dev
= qc
->dev
;
3486 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3487 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3489 ap
->ops
->tf_read(ap
, &qc
->tf
);
3490 ireason
= qc
->tf
.nsect
;
3491 bc_lo
= qc
->tf
.lbam
;
3492 bc_hi
= qc
->tf
.lbah
;
3493 bytes
= (bc_hi
<< 8) | bc_lo
;
3495 /* shall be cleared to zero, indicating xfer of data */
3496 if (ireason
& (1 << 0))
3499 /* make sure transfer direction matches expected */
3500 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3501 if (do_write
!= i_write
)
3504 __atapi_pio_bytes(qc
, bytes
);
3509 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3510 ap
->id
, dev
->devno
);
3511 qc
->err_mask
|= AC_ERR_HSM
;
3512 ap
->hsm_task_state
= HSM_ST_ERR
;
3516 * ata_pio_block - start PIO on a block
3517 * @ap: the target ata_port
3520 * None. (executing in kernel thread context)
3523 static void ata_pio_block(struct ata_port
*ap
)
3525 struct ata_queued_cmd
*qc
;
3529 * This is purely heuristic. This is a fast path.
3530 * Sometimes when we enter, BSY will be cleared in
3531 * a chk-status or two. If not, the drive is probably seeking
3532 * or something. Snooze for a couple msecs, then
3533 * chk-status again. If still busy, fall back to
3534 * HSM_ST_POLL state.
3536 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3537 if (status
& ATA_BUSY
) {
3539 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3540 if (status
& ATA_BUSY
) {
3541 ap
->hsm_task_state
= HSM_ST_POLL
;
3542 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3547 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3548 WARN_ON(qc
== NULL
);
3551 if (status
& (ATA_ERR
| ATA_DF
)) {
3552 qc
->err_mask
|= AC_ERR_DEV
;
3553 ap
->hsm_task_state
= HSM_ST_ERR
;
3557 /* transfer data if any */
3558 if (is_atapi_taskfile(&qc
->tf
)) {
3559 /* DRQ=0 means no more data to transfer */
3560 if ((status
& ATA_DRQ
) == 0) {
3561 ap
->hsm_task_state
= HSM_ST_LAST
;
3565 atapi_pio_bytes(qc
);
3567 /* handle BSY=0, DRQ=0 as error */
3568 if ((status
& ATA_DRQ
) == 0) {
3569 qc
->err_mask
|= AC_ERR_HSM
;
3570 ap
->hsm_task_state
= HSM_ST_ERR
;
3578 static void ata_pio_error(struct ata_port
*ap
)
3580 struct ata_queued_cmd
*qc
;
3582 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3583 WARN_ON(qc
== NULL
);
3585 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3586 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3588 /* make sure qc->err_mask is available to
3589 * know what's wrong and recover
3591 WARN_ON(qc
->err_mask
== 0);
3593 ap
->hsm_task_state
= HSM_ST_IDLE
;
3595 ata_poll_qc_complete(qc
);
3598 static void ata_pio_task(void *_data
)
3600 struct ata_port
*ap
= _data
;
3601 unsigned long timeout
;
3608 switch (ap
->hsm_task_state
) {
3617 qc_completed
= ata_pio_complete(ap
);
3621 case HSM_ST_LAST_POLL
:
3622 timeout
= ata_pio_poll(ap
);
3632 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3633 else if (!qc_completed
)
3638 * atapi_packet_task - Write CDB bytes to hardware
3639 * @_data: Port to which ATAPI device is attached.
3641 * When device has indicated its readiness to accept
3642 * a CDB, this function is called. Send the CDB.
3643 * If DMA is to be performed, exit immediately.
3644 * Otherwise, we are in polling mode, so poll
3645 * status under operation succeeds or fails.
3648 * Kernel thread context (may sleep)
3651 static void atapi_packet_task(void *_data
)
3653 struct ata_port
*ap
= _data
;
3654 struct ata_queued_cmd
*qc
;
3657 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3658 WARN_ON(qc
== NULL
);
3659 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3661 /* sleep-wait for BSY to clear */
3662 DPRINTK("busy wait\n");
3663 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3664 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3668 /* make sure DRQ is set */
3669 status
= ata_chk_status(ap
);
3670 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3671 qc
->err_mask
|= AC_ERR_HSM
;
3676 DPRINTK("send cdb\n");
3677 WARN_ON(qc
->dev
->cdb_len
< 12);
3679 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3680 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3681 unsigned long flags
;
3683 /* Once we're done issuing command and kicking bmdma,
3684 * irq handler takes over. To not lose irq, we need
3685 * to clear NOINTR flag before sending cdb, but
3686 * interrupt handler shouldn't be invoked before we're
3687 * finished. Hence, the following locking.
3689 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3690 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3691 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3692 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3693 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3694 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3696 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3698 /* PIO commands are handled by polling */
3699 ap
->hsm_task_state
= HSM_ST
;
3700 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
3706 ata_poll_qc_complete(qc
);
3710 * ata_qc_timeout - Handle timeout of queued command
3711 * @qc: Command that timed out
3713 * Some part of the kernel (currently, only the SCSI layer)
3714 * has noticed that the active command on port @ap has not
3715 * completed after a specified length of time. Handle this
3716 * condition by disabling DMA (if necessary) and completing
3717 * transactions, with error if necessary.
3719 * This also handles the case of the "lost interrupt", where
3720 * for some reason (possibly hardware bug, possibly driver bug)
3721 * an interrupt was not delivered to the driver, even though the
3722 * transaction completed successfully.
3725 * Inherited from SCSI layer (none, can sleep)
3728 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3730 struct ata_port
*ap
= qc
->ap
;
3731 struct ata_host_set
*host_set
= ap
->host_set
;
3732 u8 host_stat
= 0, drv_stat
;
3733 unsigned long flags
;
3737 ap
->hsm_task_state
= HSM_ST_IDLE
;
3739 spin_lock_irqsave(&host_set
->lock
, flags
);
3741 switch (qc
->tf
.protocol
) {
3744 case ATA_PROT_ATAPI_DMA
:
3745 host_stat
= ap
->ops
->bmdma_status(ap
);
3747 /* before we do anything else, clear DMA-Start bit */
3748 ap
->ops
->bmdma_stop(qc
);
3754 drv_stat
= ata_chk_status(ap
);
3756 /* ack bmdma irq events */
3757 ap
->ops
->irq_clear(ap
);
3759 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3760 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3762 /* complete taskfile transaction */
3763 qc
->err_mask
|= ac_err_mask(drv_stat
);
3767 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3769 ata_eh_qc_complete(qc
);
3775 * ata_eng_timeout - Handle timeout of queued command
3776 * @ap: Port on which timed-out command is active
3778 * Some part of the kernel (currently, only the SCSI layer)
3779 * has noticed that the active command on port @ap has not
3780 * completed after a specified length of time. Handle this
3781 * condition by disabling DMA (if necessary) and completing
3782 * transactions, with error if necessary.
3784 * This also handles the case of the "lost interrupt", where
3785 * for some reason (possibly hardware bug, possibly driver bug)
3786 * an interrupt was not delivered to the driver, even though the
3787 * transaction completed successfully.
3790 * Inherited from SCSI layer (none, can sleep)
3793 void ata_eng_timeout(struct ata_port
*ap
)
3797 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3803 * ata_qc_new - Request an available ATA command, for queueing
3804 * @ap: Port associated with device @dev
3805 * @dev: Device from whom we request an available command structure
3811 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3813 struct ata_queued_cmd
*qc
= NULL
;
3816 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3817 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3818 qc
= ata_qc_from_tag(ap
, i
);
3829 * ata_qc_new_init - Request an available ATA command, and initialize it
3830 * @ap: Port associated with device @dev
3831 * @dev: Device from whom we request an available command structure
3837 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3838 struct ata_device
*dev
)
3840 struct ata_queued_cmd
*qc
;
3842 qc
= ata_qc_new(ap
);
3855 * ata_qc_free - free unused ata_queued_cmd
3856 * @qc: Command to complete
3858 * Designed to free unused ata_queued_cmd object
3859 * in case something prevents using it.
3862 * spin_lock_irqsave(host_set lock)
3864 void ata_qc_free(struct ata_queued_cmd
*qc
)
3866 struct ata_port
*ap
= qc
->ap
;
3869 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3873 if (likely(ata_tag_valid(tag
))) {
3874 if (tag
== ap
->active_tag
)
3875 ap
->active_tag
= ATA_TAG_POISON
;
3876 qc
->tag
= ATA_TAG_POISON
;
3877 clear_bit(tag
, &ap
->qactive
);
3881 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3883 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3884 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3886 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3889 /* atapi: mark qc as inactive to prevent the interrupt handler
3890 * from completing the command twice later, before the error handler
3891 * is called. (when rc != 0 and atapi request sense is needed)
3893 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3895 /* call completion callback */
3896 qc
->complete_fn(qc
);
3899 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3901 struct ata_port
*ap
= qc
->ap
;
3903 switch (qc
->tf
.protocol
) {
3905 case ATA_PROT_ATAPI_DMA
:
3908 case ATA_PROT_ATAPI
:
3910 case ATA_PROT_PIO_MULT
:
3911 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3924 * ata_qc_issue - issue taskfile to device
3925 * @qc: command to issue to device
3927 * Prepare an ATA command to submission to device.
3928 * This includes mapping the data into a DMA-able
3929 * area, filling in the S/G table, and finally
3930 * writing the taskfile to hardware, starting the command.
3933 * spin_lock_irqsave(host_set lock)
3936 * Zero on success, AC_ERR_* mask on failure
3939 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3941 struct ata_port
*ap
= qc
->ap
;
3943 if (ata_should_dma_map(qc
)) {
3944 if (qc
->flags
& ATA_QCFLAG_SG
) {
3945 if (ata_sg_setup(qc
))
3947 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3948 if (ata_sg_setup_one(qc
))
3952 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3955 ap
->ops
->qc_prep(qc
);
3957 qc
->ap
->active_tag
= qc
->tag
;
3958 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3960 return ap
->ops
->qc_issue(qc
);
3963 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3964 return AC_ERR_SYSTEM
;
3969 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3970 * @qc: command to issue to device
3972 * Using various libata functions and hooks, this function
3973 * starts an ATA command. ATA commands are grouped into
3974 * classes called "protocols", and issuing each type of protocol
3975 * is slightly different.
3977 * May be used as the qc_issue() entry in ata_port_operations.
3980 * spin_lock_irqsave(host_set lock)
3983 * Zero on success, AC_ERR_* mask on failure
3986 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3988 struct ata_port
*ap
= qc
->ap
;
3990 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3992 switch (qc
->tf
.protocol
) {
3993 case ATA_PROT_NODATA
:
3994 ata_tf_to_host(ap
, &qc
->tf
);
3998 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3999 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4000 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4003 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4004 ata_qc_set_polling(qc
);
4005 ata_tf_to_host(ap
, &qc
->tf
);
4006 ap
->hsm_task_state
= HSM_ST
;
4007 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4010 case ATA_PROT_ATAPI
:
4011 ata_qc_set_polling(qc
);
4012 ata_tf_to_host(ap
, &qc
->tf
);
4013 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4016 case ATA_PROT_ATAPI_NODATA
:
4017 ap
->flags
|= ATA_FLAG_NOINTR
;
4018 ata_tf_to_host(ap
, &qc
->tf
);
4019 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4022 case ATA_PROT_ATAPI_DMA
:
4023 ap
->flags
|= ATA_FLAG_NOINTR
;
4024 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4025 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4026 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4031 return AC_ERR_SYSTEM
;
4038 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4039 * @qc: Info associated with this ATA transaction.
4042 * spin_lock_irqsave(host_set lock)
4045 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
4047 struct ata_port
*ap
= qc
->ap
;
4048 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4050 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4052 /* load PRD table addr. */
4053 mb(); /* make sure PRD table writes are visible to controller */
4054 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
4056 /* specify data direction, triple-check start bit is clear */
4057 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4058 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4060 dmactl
|= ATA_DMA_WR
;
4061 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
4063 /* issue r/w command */
4064 ap
->ops
->exec_command(ap
, &qc
->tf
);
4068 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4069 * @qc: Info associated with this ATA transaction.
4072 * spin_lock_irqsave(host_set lock)
4075 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4077 struct ata_port
*ap
= qc
->ap
;
4078 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4081 /* start host DMA transaction */
4082 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4083 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4085 /* Strictly, one may wish to issue a readb() here, to
4086 * flush the mmio write. However, control also passes
4087 * to the hardware at this point, and it will interrupt
4088 * us when we are to resume control. So, in effect,
4089 * we don't care when the mmio write flushes.
4090 * Further, a read of the DMA status register _immediately_
4091 * following the write may not be what certain flaky hardware
4092 * is expected, so I think it is best to not add a readb()
4093 * without first all the MMIO ATA cards/mobos.
4094 * Or maybe I'm just being paranoid.
4099 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4100 * @qc: Info associated with this ATA transaction.
4103 * spin_lock_irqsave(host_set lock)
4106 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4108 struct ata_port
*ap
= qc
->ap
;
4109 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4112 /* load PRD table addr. */
4113 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4115 /* specify data direction, triple-check start bit is clear */
4116 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4117 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4119 dmactl
|= ATA_DMA_WR
;
4120 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4122 /* issue r/w command */
4123 ap
->ops
->exec_command(ap
, &qc
->tf
);
4127 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4128 * @qc: Info associated with this ATA transaction.
4131 * spin_lock_irqsave(host_set lock)
4134 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4136 struct ata_port
*ap
= qc
->ap
;
4139 /* start host DMA transaction */
4140 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4141 outb(dmactl
| ATA_DMA_START
,
4142 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4147 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4148 * @qc: Info associated with this ATA transaction.
4150 * Writes the ATA_DMA_START flag to the DMA command register.
4152 * May be used as the bmdma_start() entry in ata_port_operations.
4155 * spin_lock_irqsave(host_set lock)
4157 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4159 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4160 ata_bmdma_start_mmio(qc
);
4162 ata_bmdma_start_pio(qc
);
4167 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4168 * @qc: Info associated with this ATA transaction.
4170 * Writes address of PRD table to device's PRD Table Address
4171 * register, sets the DMA control register, and calls
4172 * ops->exec_command() to start the transfer.
4174 * May be used as the bmdma_setup() entry in ata_port_operations.
4177 * spin_lock_irqsave(host_set lock)
4179 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4181 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4182 ata_bmdma_setup_mmio(qc
);
4184 ata_bmdma_setup_pio(qc
);
4189 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4190 * @ap: Port associated with this ATA transaction.
4192 * Clear interrupt and error flags in DMA status register.
4194 * May be used as the irq_clear() entry in ata_port_operations.
4197 * spin_lock_irqsave(host_set lock)
4200 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4202 if (ap
->flags
& ATA_FLAG_MMIO
) {
4203 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4204 writeb(readb(mmio
), mmio
);
4206 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4207 outb(inb(addr
), addr
);
4214 * ata_bmdma_status - Read PCI IDE BMDMA status
4215 * @ap: Port associated with this ATA transaction.
4217 * Read and return BMDMA status register.
4219 * May be used as the bmdma_status() entry in ata_port_operations.
4222 * spin_lock_irqsave(host_set lock)
4225 u8
ata_bmdma_status(struct ata_port
*ap
)
4228 if (ap
->flags
& ATA_FLAG_MMIO
) {
4229 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4230 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4232 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4238 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4239 * @qc: Command we are ending DMA for
4241 * Clears the ATA_DMA_START flag in the dma control register
4243 * May be used as the bmdma_stop() entry in ata_port_operations.
4246 * spin_lock_irqsave(host_set lock)
4249 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4251 struct ata_port
*ap
= qc
->ap
;
4252 if (ap
->flags
& ATA_FLAG_MMIO
) {
4253 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4255 /* clear start/stop bit */
4256 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4257 mmio
+ ATA_DMA_CMD
);
4259 /* clear start/stop bit */
4260 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4261 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4264 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4265 ata_altstatus(ap
); /* dummy read */
4269 * ata_host_intr - Handle host interrupt for given (port, task)
4270 * @ap: Port on which interrupt arrived (possibly...)
4271 * @qc: Taskfile currently active in engine
4273 * Handle host interrupt for given queued command. Currently,
4274 * only DMA interrupts are handled. All other commands are
4275 * handled via polling with interrupts disabled (nIEN bit).
4278 * spin_lock_irqsave(host_set lock)
4281 * One if interrupt was handled, zero if not (shared irq).
4284 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4285 struct ata_queued_cmd
*qc
)
4287 u8 status
, host_stat
;
4289 switch (qc
->tf
.protocol
) {
4292 case ATA_PROT_ATAPI_DMA
:
4293 case ATA_PROT_ATAPI
:
4294 /* check status of DMA engine */
4295 host_stat
= ap
->ops
->bmdma_status(ap
);
4296 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4298 /* if it's not our irq... */
4299 if (!(host_stat
& ATA_DMA_INTR
))
4302 /* before we do anything else, clear DMA-Start bit */
4303 ap
->ops
->bmdma_stop(qc
);
4307 case ATA_PROT_ATAPI_NODATA
:
4308 case ATA_PROT_NODATA
:
4309 /* check altstatus */
4310 status
= ata_altstatus(ap
);
4311 if (status
& ATA_BUSY
)
4314 /* check main status, clearing INTRQ */
4315 status
= ata_chk_status(ap
);
4316 if (unlikely(status
& ATA_BUSY
))
4318 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4319 ap
->id
, qc
->tf
.protocol
, status
);
4321 /* ack bmdma irq events */
4322 ap
->ops
->irq_clear(ap
);
4324 /* complete taskfile transaction */
4325 qc
->err_mask
|= ac_err_mask(status
);
4326 ata_qc_complete(qc
);
4333 return 1; /* irq handled */
4336 ap
->stats
.idle_irq
++;
4339 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4341 ata_irq_ack(ap
, 0); /* debug trap */
4342 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4345 return 0; /* irq not handled */
4349 * ata_interrupt - Default ATA host interrupt handler
4350 * @irq: irq line (unused)
4351 * @dev_instance: pointer to our ata_host_set information structure
4354 * Default interrupt handler for PCI IDE devices. Calls
4355 * ata_host_intr() for each port that is not disabled.
4358 * Obtains host_set lock during operation.
4361 * IRQ_NONE or IRQ_HANDLED.
4364 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4366 struct ata_host_set
*host_set
= dev_instance
;
4368 unsigned int handled
= 0;
4369 unsigned long flags
;
4371 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4372 spin_lock_irqsave(&host_set
->lock
, flags
);
4374 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4375 struct ata_port
*ap
;
4377 ap
= host_set
->ports
[i
];
4379 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4380 struct ata_queued_cmd
*qc
;
4382 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4383 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4384 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4385 handled
|= ata_host_intr(ap
, qc
);
4389 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4391 return IRQ_RETVAL(handled
);
4396 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4397 * without filling any other registers
4399 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4402 struct ata_taskfile tf
;
4405 ata_tf_init(ap
, &tf
, dev
->devno
);
4408 tf
.flags
|= ATA_TFLAG_DEVICE
;
4409 tf
.protocol
= ATA_PROT_NODATA
;
4411 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4413 printk(KERN_ERR
"%s: ata command failed: %d\n",
4419 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4423 if (!ata_try_flush_cache(dev
))
4426 if (ata_id_has_flush_ext(dev
->id
))
4427 cmd
= ATA_CMD_FLUSH_EXT
;
4429 cmd
= ATA_CMD_FLUSH
;
4431 return ata_do_simple_cmd(ap
, dev
, cmd
);
4434 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4436 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4439 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4441 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4445 * ata_device_resume - wakeup a previously suspended devices
4446 * @ap: port the device is connected to
4447 * @dev: the device to resume
4449 * Kick the drive back into action, by sending it an idle immediate
4450 * command and making sure its transfer mode matches between drive
4454 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4456 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4457 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4460 if (!ata_dev_present(dev
))
4462 if (dev
->class == ATA_DEV_ATA
)
4463 ata_start_drive(ap
, dev
);
4469 * ata_device_suspend - prepare a device for suspend
4470 * @ap: port the device is connected to
4471 * @dev: the device to suspend
4473 * Flush the cache on the drive, if appropriate, then issue a
4474 * standbynow command.
4476 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4478 if (!ata_dev_present(dev
))
4480 if (dev
->class == ATA_DEV_ATA
)
4481 ata_flush_cache(ap
, dev
);
4483 ata_standby_drive(ap
, dev
);
4484 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4489 * ata_port_start - Set port up for dma.
4490 * @ap: Port to initialize
4492 * Called just after data structures for each port are
4493 * initialized. Allocates space for PRD table.
4495 * May be used as the port_start() entry in ata_port_operations.
4498 * Inherited from caller.
4501 int ata_port_start (struct ata_port
*ap
)
4503 struct device
*dev
= ap
->host_set
->dev
;
4506 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4510 rc
= ata_pad_alloc(ap
, dev
);
4512 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4516 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4523 * ata_port_stop - Undo ata_port_start()
4524 * @ap: Port to shut down
4526 * Frees the PRD table.
4528 * May be used as the port_stop() entry in ata_port_operations.
4531 * Inherited from caller.
4534 void ata_port_stop (struct ata_port
*ap
)
4536 struct device
*dev
= ap
->host_set
->dev
;
4538 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4539 ata_pad_free(ap
, dev
);
4542 void ata_host_stop (struct ata_host_set
*host_set
)
4544 if (host_set
->mmio_base
)
4545 iounmap(host_set
->mmio_base
);
4550 * ata_host_remove - Unregister SCSI host structure with upper layers
4551 * @ap: Port to unregister
4552 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4555 * Inherited from caller.
4558 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4560 struct Scsi_Host
*sh
= ap
->host
;
4565 scsi_remove_host(sh
);
4567 ap
->ops
->port_stop(ap
);
4571 * ata_host_init - Initialize an ata_port structure
4572 * @ap: Structure to initialize
4573 * @host: associated SCSI mid-layer structure
4574 * @host_set: Collection of hosts to which @ap belongs
4575 * @ent: Probe information provided by low-level driver
4576 * @port_no: Port number associated with this ata_port
4578 * Initialize a new ata_port structure, and its associated
4582 * Inherited from caller.
4585 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4586 struct ata_host_set
*host_set
,
4587 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4593 host
->max_channel
= 1;
4594 host
->unique_id
= ata_unique_id
++;
4595 host
->max_cmd_len
= 12;
4597 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4598 ap
->id
= host
->unique_id
;
4600 ap
->ctl
= ATA_DEVCTL_OBS
;
4601 ap
->host_set
= host_set
;
4602 ap
->port_no
= port_no
;
4604 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4605 ap
->pio_mask
= ent
->pio_mask
;
4606 ap
->mwdma_mask
= ent
->mwdma_mask
;
4607 ap
->udma_mask
= ent
->udma_mask
;
4608 ap
->flags
|= ent
->host_flags
;
4609 ap
->ops
= ent
->port_ops
;
4610 ap
->cbl
= ATA_CBL_NONE
;
4611 ap
->active_tag
= ATA_TAG_POISON
;
4612 ap
->last_ctl
= 0xFF;
4614 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4615 INIT_LIST_HEAD(&ap
->eh_done_q
);
4617 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4618 ap
->device
[i
].devno
= i
;
4621 ap
->stats
.unhandled_irq
= 1;
4622 ap
->stats
.idle_irq
= 1;
4625 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4629 * ata_host_add - Attach low-level ATA driver to system
4630 * @ent: Information provided by low-level driver
4631 * @host_set: Collections of ports to which we add
4632 * @port_no: Port number associated with this host
4634 * Attach low-level ATA driver to system.
4637 * PCI/etc. bus probe sem.
4640 * New ata_port on success, for NULL on error.
4643 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4644 struct ata_host_set
*host_set
,
4645 unsigned int port_no
)
4647 struct Scsi_Host
*host
;
4648 struct ata_port
*ap
;
4652 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4656 ap
= (struct ata_port
*) &host
->hostdata
[0];
4658 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4660 rc
= ap
->ops
->port_start(ap
);
4667 scsi_host_put(host
);
4672 * ata_device_add - Register hardware device with ATA and SCSI layers
4673 * @ent: Probe information describing hardware device to be registered
4675 * This function processes the information provided in the probe
4676 * information struct @ent, allocates the necessary ATA and SCSI
4677 * host information structures, initializes them, and registers
4678 * everything with requisite kernel subsystems.
4680 * This function requests irqs, probes the ATA bus, and probes
4684 * PCI/etc. bus probe sem.
4687 * Number of ports registered. Zero on error (no ports registered).
4690 int ata_device_add(const struct ata_probe_ent
*ent
)
4692 unsigned int count
= 0, i
;
4693 struct device
*dev
= ent
->dev
;
4694 struct ata_host_set
*host_set
;
4697 /* alloc a container for our list of ATA ports (buses) */
4698 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4699 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4702 spin_lock_init(&host_set
->lock
);
4704 host_set
->dev
= dev
;
4705 host_set
->n_ports
= ent
->n_ports
;
4706 host_set
->irq
= ent
->irq
;
4707 host_set
->mmio_base
= ent
->mmio_base
;
4708 host_set
->private_data
= ent
->private_data
;
4709 host_set
->ops
= ent
->port_ops
;
4711 /* register each port bound to this device */
4712 for (i
= 0; i
< ent
->n_ports
; i
++) {
4713 struct ata_port
*ap
;
4714 unsigned long xfer_mode_mask
;
4716 ap
= ata_host_add(ent
, host_set
, i
);
4720 host_set
->ports
[i
] = ap
;
4721 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4722 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4723 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4725 /* print per-port info to dmesg */
4726 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4727 "bmdma 0x%lX irq %lu\n",
4729 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4730 ata_mode_string(xfer_mode_mask
),
4731 ap
->ioaddr
.cmd_addr
,
4732 ap
->ioaddr
.ctl_addr
,
4733 ap
->ioaddr
.bmdma_addr
,
4737 host_set
->ops
->irq_clear(ap
);
4744 /* obtain irq, that is shared between channels */
4745 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4746 DRV_NAME
, host_set
))
4749 /* perform each probe synchronously */
4750 DPRINTK("probe begin\n");
4751 for (i
= 0; i
< count
; i
++) {
4752 struct ata_port
*ap
;
4755 ap
= host_set
->ports
[i
];
4757 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4758 rc
= ata_bus_probe(ap
);
4759 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4762 /* FIXME: do something useful here?
4763 * Current libata behavior will
4764 * tear down everything when
4765 * the module is removed
4766 * or the h/w is unplugged.
4770 rc
= scsi_add_host(ap
->host
, dev
);
4772 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4774 /* FIXME: do something useful here */
4775 /* FIXME: handle unconditional calls to
4776 * scsi_scan_host and ata_host_remove, below,
4782 /* probes are done, now scan each port's disk(s) */
4783 DPRINTK("host probe begin\n");
4784 for (i
= 0; i
< count
; i
++) {
4785 struct ata_port
*ap
= host_set
->ports
[i
];
4787 ata_scsi_scan_host(ap
);
4790 dev_set_drvdata(dev
, host_set
);
4792 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4793 return ent
->n_ports
; /* success */
4796 for (i
= 0; i
< count
; i
++) {
4797 ata_host_remove(host_set
->ports
[i
], 1);
4798 scsi_host_put(host_set
->ports
[i
]->host
);
4802 VPRINTK("EXIT, returning 0\n");
4807 * ata_host_set_remove - PCI layer callback for device removal
4808 * @host_set: ATA host set that was removed
4810 * Unregister all objects associated with this host set. Free those
4814 * Inherited from calling layer (may sleep).
4817 void ata_host_set_remove(struct ata_host_set
*host_set
)
4819 struct ata_port
*ap
;
4822 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4823 ap
= host_set
->ports
[i
];
4824 scsi_remove_host(ap
->host
);
4827 free_irq(host_set
->irq
, host_set
);
4829 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4830 ap
= host_set
->ports
[i
];
4832 ata_scsi_release(ap
->host
);
4834 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4835 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4837 if (ioaddr
->cmd_addr
== 0x1f0)
4838 release_region(0x1f0, 8);
4839 else if (ioaddr
->cmd_addr
== 0x170)
4840 release_region(0x170, 8);
4843 scsi_host_put(ap
->host
);
4846 if (host_set
->ops
->host_stop
)
4847 host_set
->ops
->host_stop(host_set
);
4853 * ata_scsi_release - SCSI layer callback hook for host unload
4854 * @host: libata host to be unloaded
4856 * Performs all duties necessary to shut down a libata port...
4857 * Kill port kthread, disable port, and release resources.
4860 * Inherited from SCSI layer.
4866 int ata_scsi_release(struct Scsi_Host
*host
)
4868 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4873 ap
->ops
->port_disable(ap
);
4874 ata_host_remove(ap
, 0);
4875 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4876 kfree(ap
->device
[i
].id
);
4883 * ata_std_ports - initialize ioaddr with standard port offsets.
4884 * @ioaddr: IO address structure to be initialized
4886 * Utility function which initializes data_addr, error_addr,
4887 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4888 * device_addr, status_addr, and command_addr to standard offsets
4889 * relative to cmd_addr.
4891 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4894 void ata_std_ports(struct ata_ioports
*ioaddr
)
4896 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4897 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4898 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4899 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4900 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4901 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4902 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4903 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4904 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4905 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4911 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4913 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4915 pci_iounmap(pdev
, host_set
->mmio_base
);
4919 * ata_pci_remove_one - PCI layer callback for device removal
4920 * @pdev: PCI device that was removed
4922 * PCI layer indicates to libata via this hook that
4923 * hot-unplug or module unload event has occurred.
4924 * Handle this by unregistering all objects associated
4925 * with this PCI device. Free those objects. Then finally
4926 * release PCI resources and disable device.
4929 * Inherited from PCI layer (may sleep).
4932 void ata_pci_remove_one (struct pci_dev
*pdev
)
4934 struct device
*dev
= pci_dev_to_dev(pdev
);
4935 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4937 ata_host_set_remove(host_set
);
4938 pci_release_regions(pdev
);
4939 pci_disable_device(pdev
);
4940 dev_set_drvdata(dev
, NULL
);
4943 /* move to PCI subsystem */
4944 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4946 unsigned long tmp
= 0;
4948 switch (bits
->width
) {
4951 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4957 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4963 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4974 return (tmp
== bits
->val
) ? 1 : 0;
4977 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4979 pci_save_state(pdev
);
4980 pci_disable_device(pdev
);
4981 pci_set_power_state(pdev
, PCI_D3hot
);
4985 int ata_pci_device_resume(struct pci_dev
*pdev
)
4987 pci_set_power_state(pdev
, PCI_D0
);
4988 pci_restore_state(pdev
);
4989 pci_enable_device(pdev
);
4990 pci_set_master(pdev
);
4993 #endif /* CONFIG_PCI */
4996 static int __init
ata_init(void)
4998 ata_wq
= create_workqueue("ata");
5002 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5006 static void __exit
ata_exit(void)
5008 destroy_workqueue(ata_wq
);
5011 module_init(ata_init
);
5012 module_exit(ata_exit
);
5014 static unsigned long ratelimit_time
;
5015 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5017 int ata_ratelimit(void)
5020 unsigned long flags
;
5022 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5024 if (time_after(jiffies
, ratelimit_time
)) {
5026 ratelimit_time
= jiffies
+ (HZ
/5);
5030 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5036 * libata is essentially a library of internal helper functions for
5037 * low-level ATA host controller drivers. As such, the API/ABI is
5038 * likely to change as new drivers are added and updated.
5039 * Do not depend on ABI/API stability.
5042 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5043 EXPORT_SYMBOL_GPL(ata_std_ports
);
5044 EXPORT_SYMBOL_GPL(ata_device_add
);
5045 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5046 EXPORT_SYMBOL_GPL(ata_sg_init
);
5047 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5048 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5049 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5050 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5051 EXPORT_SYMBOL_GPL(ata_tf_load
);
5052 EXPORT_SYMBOL_GPL(ata_tf_read
);
5053 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5054 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5055 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5056 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5057 EXPORT_SYMBOL_GPL(ata_check_status
);
5058 EXPORT_SYMBOL_GPL(ata_altstatus
);
5059 EXPORT_SYMBOL_GPL(ata_exec_command
);
5060 EXPORT_SYMBOL_GPL(ata_port_start
);
5061 EXPORT_SYMBOL_GPL(ata_port_stop
);
5062 EXPORT_SYMBOL_GPL(ata_host_stop
);
5063 EXPORT_SYMBOL_GPL(ata_interrupt
);
5064 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5065 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5066 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5067 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5068 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5069 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5070 EXPORT_SYMBOL_GPL(ata_port_probe
);
5071 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5072 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5073 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5074 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5075 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5076 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5077 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5078 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5079 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5080 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5081 EXPORT_SYMBOL_GPL(ata_port_disable
);
5082 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5083 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5084 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5085 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5086 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5087 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
5088 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5089 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5090 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5091 EXPORT_SYMBOL_GPL(ata_host_intr
);
5092 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5093 EXPORT_SYMBOL_GPL(ata_id_string
);
5094 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5095 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5096 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5097 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5099 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5100 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5101 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5104 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5105 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5106 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5107 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5108 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5109 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5110 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5111 #endif /* CONFIG_PCI */
5113 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5114 EXPORT_SYMBOL_GPL(ata_device_resume
);
5115 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5116 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);