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_device
*dev
,
65 u16 heads
, u16 sectors
);
66 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
67 static void ata_dev_xfermask(struct ata_device
*dev
);
69 static unsigned int ata_unique_id
= 1;
70 static struct workqueue_struct
*ata_wq
;
72 int atapi_enabled
= 1;
73 module_param(atapi_enabled
, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir
, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua
, libata_fua
, int, 0444);
82 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
105 fis
[0] = 0x27; /* Register - Host to Device FIS */
106 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis
[2] = tf
->command
;
109 fis
[3] = tf
->feature
;
116 fis
[8] = tf
->hob_lbal
;
117 fis
[9] = tf
->hob_lbam
;
118 fis
[10] = tf
->hob_lbah
;
119 fis
[11] = tf
->hob_feature
;
122 fis
[13] = tf
->hob_nsect
;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
145 tf
->command
= fis
[2]; /* status */
146 tf
->feature
= fis
[3]; /* error */
153 tf
->hob_lbal
= fis
[8];
154 tf
->hob_lbam
= fis
[9];
155 tf
->hob_lbah
= fis
[10];
158 tf
->hob_nsect
= fis
[13];
161 static const u8 ata_rw_cmds
[] = {
165 ATA_CMD_READ_MULTI_EXT
,
166 ATA_CMD_WRITE_MULTI_EXT
,
170 ATA_CMD_WRITE_MULTI_FUA_EXT
,
174 ATA_CMD_PIO_READ_EXT
,
175 ATA_CMD_PIO_WRITE_EXT
,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
203 struct ata_taskfile
*tf
= &qc
->tf
;
204 struct ata_device
*dev
= qc
->dev
;
207 int index
, fua
, lba48
, write
;
209 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
210 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
211 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
213 if (dev
->flags
& ATA_DFLAG_PIO
) {
214 tf
->protocol
= ATA_PROT_PIO
;
215 index
= dev
->multi_count
? 0 : 8;
216 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
217 /* Unable to use DMA due to host limitation */
218 tf
->protocol
= ATA_PROT_PIO
;
219 index
= dev
->multi_count
? 0 : 8;
221 tf
->protocol
= ATA_PROT_DMA
;
225 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
249 unsigned int mwdma_mask
,
250 unsigned int udma_mask
)
252 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
253 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
254 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask
,
268 unsigned int *pio_mask
,
269 unsigned int *mwdma_mask
,
270 unsigned int *udma_mask
)
273 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
275 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
277 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
280 static const struct ata_xfer_ent
{
284 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
285 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
286 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
305 int highbit
= fls(xfer_mask
) - 1;
306 const struct ata_xfer_ent
*ent
;
308 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
309 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
310 return ent
->base
+ highbit
- ent
->shift
;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
328 const struct ata_xfer_ent
*ent
;
330 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
331 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
332 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
350 const struct ata_xfer_ent
*ent
;
352 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
353 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask
)
374 static const char * const xfer_mode_str
[] = {
394 highbit
= fls(xfer_mask
) - 1;
395 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
396 return xfer_mode_str
[highbit
];
400 static const char *sata_spd_string(unsigned int spd
)
402 static const char * const spd_str
[] = {
407 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
409 return spd_str
[spd
- 1];
412 void ata_dev_disable(struct ata_device
*dev
)
414 if (ata_dev_enabled(dev
)) {
415 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
441 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
444 ap
->ops
->dev_select(ap
, device
);
446 outb(0x55, ioaddr
->nsect_addr
);
447 outb(0xaa, ioaddr
->lbal_addr
);
449 outb(0xaa, ioaddr
->nsect_addr
);
450 outb(0x55, ioaddr
->lbal_addr
);
452 outb(0x55, ioaddr
->nsect_addr
);
453 outb(0xaa, ioaddr
->lbal_addr
);
455 nsect
= inb(ioaddr
->nsect_addr
);
456 lbal
= inb(ioaddr
->lbal_addr
);
458 if ((nsect
== 0x55) && (lbal
== 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
485 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
488 ap
->ops
->dev_select(ap
, device
);
490 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
491 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
493 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
494 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
496 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
499 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
500 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
502 if ((nsect
== 0x55) && (lbal
== 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port
*ap
,
524 if (ap
->flags
& ATA_FLAG_MMIO
)
525 return ata_mmio_devchk(ap
, device
);
526 return ata_pio_devchk(ap
, device
);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
553 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
559 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI
;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN
;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
593 struct ata_taskfile tf
;
597 ap
->ops
->dev_select(ap
, device
);
599 memset(&tf
, 0, sizeof(tf
));
601 ap
->ops
->tf_read(ap
, &tf
);
606 /* see if device passed diags */
609 else if ((device
== 0) && (err
== 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf
);
617 if (class == ATA_DEV_UNKNOWN
)
619 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16
*id
, unsigned char *s
,
640 unsigned int ofs
, unsigned int len
)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16
*id
, unsigned char *s
,
673 unsigned int ofs
, unsigned int len
)
679 ata_id_string(id
, s
, ofs
, len
- 1);
681 p
= s
+ strnlen(s
, len
- 1);
682 while (p
> s
&& p
[-1] == ' ')
687 static u64
ata_id_n_sectors(const u16
*id
)
689 if (ata_id_has_lba(id
)) {
690 if (ata_id_has_lba48(id
))
691 return ata_id_u64(id
, 100);
693 return ata_id_u32(id
, 60);
695 if (ata_id_current_chs_valid(id
))
696 return ata_id_u32(id
, 57);
698 return id
[1] * id
[3] * id
[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
739 tmp
= ATA_DEVICE_OBS
;
741 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
743 if (ap
->flags
& ATA_FLAG_MMIO
) {
744 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
746 outb(tmp
, ap
->ioaddr
.device_addr
);
748 ata_pause(ap
); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
771 unsigned int wait
, unsigned int can_sleep
)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap
->id
, device
, wait
);
779 ap
->ops
->dev_select(ap
, device
);
782 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16
*id
)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16
*id
)
844 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
848 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
869 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
870 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
872 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
878 * @fn: workqueue function to be scheduled
879 * @data: data value to pass to workqueue function
880 * @delay: delay time for workqueue function
882 * Schedule @fn(@data) for execution after @delay jiffies using
883 * port_task. There is one port_task per port and it's the
884 * user(low level driver)'s responsibility to make sure that only
885 * one task is active at any given time.
887 * libata core layer takes care of synchronization between
888 * port_task and EH. ata_port_queue_task() may be ignored for EH
892 * Inherited from caller.
894 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
899 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
902 PREPARE_WORK(&ap
->port_task
, fn
, data
);
905 rc
= queue_work(ata_wq
, &ap
->port_task
);
907 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
909 /* rc == 0 means that another user is using port task */
914 * ata_port_flush_task - Flush port_task
915 * @ap: The ata_port to flush port_task for
917 * After this function completes, port_task is guranteed not to
918 * be running or scheduled.
921 * Kernel thread context (may sleep)
923 void ata_port_flush_task(struct ata_port
*ap
)
929 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
930 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
931 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
933 DPRINTK("flush #1\n");
934 flush_workqueue(ata_wq
);
937 * At this point, if a task is running, it's guaranteed to see
938 * the FLUSH flag; thus, it will never queue pio tasks again.
941 if (!cancel_delayed_work(&ap
->port_task
)) {
942 DPRINTK("flush #2\n");
943 flush_workqueue(ata_wq
);
946 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
947 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
948 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
953 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
955 struct completion
*waiting
= qc
->private_data
;
961 * ata_exec_internal - execute libata internal command
962 * @dev: Device to which the command is sent
963 * @tf: Taskfile registers for the command and the result
964 * @cdb: CDB for packet command
965 * @dma_dir: Data tranfer direction of the command
966 * @buf: Data buffer of the command
967 * @buflen: Length of data buffer
969 * Executes libata internal command with timeout. @tf contains
970 * command on entry and result on return. Timeout and error
971 * conditions are reported via return value. No recovery action
972 * is taken after a command times out. It's caller's duty to
973 * clean up after timeout.
976 * None. Should be called with kernel context, might sleep.
979 unsigned ata_exec_internal(struct ata_device
*dev
,
980 struct ata_taskfile
*tf
, const u8
*cdb
,
981 int dma_dir
, void *buf
, unsigned int buflen
)
983 struct ata_port
*ap
= dev
->ap
;
984 u8 command
= tf
->command
;
985 struct ata_queued_cmd
*qc
;
986 unsigned int tag
, preempted_tag
;
987 u32 preempted_sactive
, preempted_qc_active
;
988 DECLARE_COMPLETION(wait
);
990 unsigned int err_mask
;
993 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
995 /* no internal command while frozen */
996 if (ap
->flags
& ATA_FLAG_FROZEN
) {
997 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
998 return AC_ERR_SYSTEM
;
1001 /* initialize internal qc */
1003 /* XXX: Tag 0 is used for drivers with legacy EH as some
1004 * drivers choke if any other tag is given. This breaks
1005 * ata_tag_internal() test for those drivers. Don't use new
1006 * EH stuff without converting to it.
1008 if (ap
->ops
->error_handler
)
1009 tag
= ATA_TAG_INTERNAL
;
1013 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1015 qc
= __ata_qc_from_tag(ap
, tag
);
1023 preempted_tag
= ap
->active_tag
;
1024 preempted_sactive
= ap
->sactive
;
1025 preempted_qc_active
= ap
->qc_active
;
1026 ap
->active_tag
= ATA_TAG_POISON
;
1030 /* prepare & issue qc */
1033 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1034 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1035 qc
->dma_dir
= dma_dir
;
1036 if (dma_dir
!= DMA_NONE
) {
1037 ata_sg_init_one(qc
, buf
, buflen
);
1038 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1041 qc
->private_data
= &wait
;
1042 qc
->complete_fn
= ata_qc_complete_internal
;
1046 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1048 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1050 ata_port_flush_task(ap
);
1053 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1055 /* We're racing with irq here. If we lose, the
1056 * following test prevents us from completing the qc
1057 * twice. If we win, the port is frozen and will be
1058 * cleaned up by ->post_internal_cmd().
1060 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1061 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1063 if (ap
->ops
->error_handler
)
1064 ata_port_freeze(ap
);
1066 ata_qc_complete(qc
);
1068 ata_dev_printk(dev
, KERN_WARNING
,
1069 "qc timeout (cmd 0x%x)\n", command
);
1072 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1075 /* do post_internal_cmd */
1076 if (ap
->ops
->post_internal_cmd
)
1077 ap
->ops
->post_internal_cmd(qc
);
1079 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1080 ata_dev_printk(dev
, KERN_WARNING
, "zero err_mask for failed "
1081 "internal command, assuming AC_ERR_OTHER\n");
1082 qc
->err_mask
|= AC_ERR_OTHER
;
1086 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1088 *tf
= qc
->result_tf
;
1089 err_mask
= qc
->err_mask
;
1092 ap
->active_tag
= preempted_tag
;
1093 ap
->sactive
= preempted_sactive
;
1094 ap
->qc_active
= preempted_qc_active
;
1096 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1097 * Until those drivers are fixed, we detect the condition
1098 * here, fail the command with AC_ERR_SYSTEM and reenable the
1101 * Note that this doesn't change any behavior as internal
1102 * command failure results in disabling the device in the
1103 * higher layer for LLDDs without new reset/EH callbacks.
1105 * Kill the following code as soon as those drivers are fixed.
1107 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1108 err_mask
|= AC_ERR_SYSTEM
;
1112 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1118 * ata_pio_need_iordy - check if iordy needed
1121 * Check if the current speed of the device requires IORDY. Used
1122 * by various controllers for chip configuration.
1125 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1128 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1135 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1137 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1138 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1139 /* Is the speed faster than the drive allows non IORDY ? */
1141 /* This is cycle times not frequency - watch the logic! */
1142 if (pio
> 240) /* PIO2 is 240nS per cycle */
1151 * ata_dev_read_id - Read ID data from the specified device
1152 * @dev: target device
1153 * @p_class: pointer to class of the target device (may be changed)
1154 * @post_reset: is this read ID post-reset?
1155 * @id: buffer to read IDENTIFY data into
1157 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1158 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1159 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1160 * for pre-ATA4 drives.
1163 * Kernel thread context (may sleep)
1166 * 0 on success, -errno otherwise.
1168 static int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1169 int post_reset
, u16
*id
)
1171 struct ata_port
*ap
= dev
->ap
;
1172 unsigned int class = *p_class
;
1173 struct ata_taskfile tf
;
1174 unsigned int err_mask
= 0;
1178 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1180 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1183 ata_tf_init(dev
, &tf
);
1187 tf
.command
= ATA_CMD_ID_ATA
;
1190 tf
.command
= ATA_CMD_ID_ATAPI
;
1194 reason
= "unsupported class";
1198 tf
.protocol
= ATA_PROT_PIO
;
1200 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1201 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1204 reason
= "I/O error";
1208 swap_buf_le16(id
, ATA_ID_WORDS
);
1211 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1213 reason
= "device reports illegal type";
1217 if (post_reset
&& class == ATA_DEV_ATA
) {
1219 * The exact sequence expected by certain pre-ATA4 drives is:
1222 * INITIALIZE DEVICE PARAMETERS
1224 * Some drives were very specific about that exact sequence.
1226 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1227 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1230 reason
= "INIT_DEV_PARAMS failed";
1234 /* current CHS translation info (id[53-58]) might be
1235 * changed. reread the identify device info.
1247 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1248 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1252 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1254 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1257 static void ata_dev_config_ncq(struct ata_device
*dev
,
1258 char *desc
, size_t desc_sz
)
1260 struct ata_port
*ap
= dev
->ap
;
1261 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1263 if (!ata_id_has_ncq(dev
->id
)) {
1268 if (ap
->flags
& ATA_FLAG_NCQ
) {
1269 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1270 dev
->flags
|= ATA_DFLAG_NCQ
;
1273 if (hdepth
>= ddepth
)
1274 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1276 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1280 * ata_dev_configure - Configure the specified ATA/ATAPI device
1281 * @dev: Target device to configure
1282 * @print_info: Enable device info printout
1284 * Configure @dev according to @dev->id. Generic and low-level
1285 * driver specific fixups are also applied.
1288 * Kernel thread context (may sleep)
1291 * 0 on success, -errno otherwise
1293 static int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1295 struct ata_port
*ap
= dev
->ap
;
1296 const u16
*id
= dev
->id
;
1297 unsigned int xfer_mask
;
1300 if (!ata_dev_enabled(dev
)) {
1301 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1302 ap
->id
, dev
->devno
);
1306 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1308 /* print device capabilities */
1310 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1311 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1312 id
[49], id
[82], id
[83], id
[84],
1313 id
[85], id
[86], id
[87], id
[88]);
1315 /* initialize to-be-configured parameters */
1316 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1317 dev
->max_sectors
= 0;
1325 * common ATA, ATAPI feature tests
1328 /* find max transfer mode; for printk only */
1329 xfer_mask
= ata_id_xfermask(id
);
1333 /* ATA-specific feature tests */
1334 if (dev
->class == ATA_DEV_ATA
) {
1335 dev
->n_sectors
= ata_id_n_sectors(id
);
1337 if (ata_id_has_lba(id
)) {
1338 const char *lba_desc
;
1342 dev
->flags
|= ATA_DFLAG_LBA
;
1343 if (ata_id_has_lba48(id
)) {
1344 dev
->flags
|= ATA_DFLAG_LBA48
;
1349 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1351 /* print device info to dmesg */
1353 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1354 "max %s, %Lu sectors: %s %s\n",
1355 ata_id_major_version(id
),
1356 ata_mode_string(xfer_mask
),
1357 (unsigned long long)dev
->n_sectors
,
1358 lba_desc
, ncq_desc
);
1362 /* Default translation */
1363 dev
->cylinders
= id
[1];
1365 dev
->sectors
= id
[6];
1367 if (ata_id_current_chs_valid(id
)) {
1368 /* Current CHS translation is valid. */
1369 dev
->cylinders
= id
[54];
1370 dev
->heads
= id
[55];
1371 dev
->sectors
= id
[56];
1374 /* print device info to dmesg */
1376 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1377 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1378 ata_id_major_version(id
),
1379 ata_mode_string(xfer_mask
),
1380 (unsigned long long)dev
->n_sectors
,
1381 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1384 if (dev
->id
[59] & 0x100) {
1385 dev
->multi_count
= dev
->id
[59] & 0xff;
1386 DPRINTK("ata%u: dev %u multi count %u\n",
1387 ap
->id
, dev
->devno
, dev
->multi_count
);
1393 /* ATAPI-specific feature tests */
1394 else if (dev
->class == ATA_DEV_ATAPI
) {
1395 char *cdb_intr_string
= "";
1397 rc
= atapi_cdb_len(id
);
1398 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1399 ata_dev_printk(dev
, KERN_WARNING
,
1400 "unsupported CDB len\n");
1404 dev
->cdb_len
= (unsigned int) rc
;
1406 if (ata_id_cdb_intr(dev
->id
)) {
1407 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1408 cdb_intr_string
= ", CDB intr";
1411 /* print device info to dmesg */
1413 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1414 ata_mode_string(xfer_mask
),
1418 ap
->host
->max_cmd_len
= 0;
1419 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1420 ap
->host
->max_cmd_len
= max_t(unsigned int,
1421 ap
->host
->max_cmd_len
,
1422 ap
->device
[i
].cdb_len
);
1424 /* limit bridge transfers to udma5, 200 sectors */
1425 if (ata_dev_knobble(dev
)) {
1427 ata_dev_printk(dev
, KERN_INFO
,
1428 "applying bridge limits\n");
1429 dev
->udma_mask
&= ATA_UDMA5
;
1430 dev
->max_sectors
= ATA_MAX_SECTORS
;
1433 if (ap
->ops
->dev_config
)
1434 ap
->ops
->dev_config(ap
, dev
);
1436 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1440 DPRINTK("EXIT, err\n");
1445 * ata_bus_probe - Reset and probe ATA bus
1448 * Master ATA bus probing function. Initiates a hardware-dependent
1449 * bus reset, then attempts to identify any devices found on
1453 * PCI/etc. bus probe sem.
1456 * Zero on success, negative errno otherwise.
1459 static int ata_bus_probe(struct ata_port
*ap
)
1461 unsigned int classes
[ATA_MAX_DEVICES
];
1462 int tries
[ATA_MAX_DEVICES
];
1463 int i
, rc
, down_xfermask
;
1464 struct ata_device
*dev
;
1468 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1469 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1474 /* reset and determine device classes */
1475 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1476 classes
[i
] = ATA_DEV_UNKNOWN
;
1478 if (ap
->ops
->probe_reset
) {
1479 rc
= ap
->ops
->probe_reset(ap
, classes
);
1481 ata_port_printk(ap
, KERN_ERR
,
1482 "reset failed (errno=%d)\n", rc
);
1486 ap
->ops
->phy_reset(ap
);
1488 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1489 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1490 classes
[i
] = ap
->device
[i
].class;
1491 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1497 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1498 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1499 classes
[i
] = ATA_DEV_NONE
;
1501 /* after the reset the device state is PIO 0 and the controller
1502 state is undefined. Record the mode */
1504 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1505 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1507 /* read IDENTIFY page and configure devices */
1508 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1509 dev
= &ap
->device
[i
];
1512 dev
->class = classes
[i
];
1514 if (!ata_dev_enabled(dev
))
1517 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1521 rc
= ata_dev_configure(dev
, 1);
1526 /* configure transfer mode */
1527 rc
= ata_set_mode(ap
, &dev
);
1533 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1534 if (ata_dev_enabled(&ap
->device
[i
]))
1537 /* no device present, disable port */
1538 ata_port_disable(ap
);
1539 ap
->ops
->port_disable(ap
);
1546 tries
[dev
->devno
] = 0;
1549 sata_down_spd_limit(ap
);
1552 tries
[dev
->devno
]--;
1553 if (down_xfermask
&&
1554 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1555 tries
[dev
->devno
] = 0;
1558 if (!tries
[dev
->devno
]) {
1559 ata_down_xfermask_limit(dev
, 1);
1560 ata_dev_disable(dev
);
1567 * ata_port_probe - Mark port as enabled
1568 * @ap: Port for which we indicate enablement
1570 * Modify @ap data structure such that the system
1571 * thinks that the entire port is enabled.
1573 * LOCKING: host_set lock, or some other form of
1577 void ata_port_probe(struct ata_port
*ap
)
1579 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1583 * sata_print_link_status - Print SATA link status
1584 * @ap: SATA port to printk link status about
1586 * This function prints link speed and status of a SATA link.
1591 static void sata_print_link_status(struct ata_port
*ap
)
1593 u32 sstatus
, scontrol
, tmp
;
1595 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1597 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1599 if (ata_port_online(ap
)) {
1600 tmp
= (sstatus
>> 4) & 0xf;
1601 ata_port_printk(ap
, KERN_INFO
,
1602 "SATA link up %s (SStatus %X SControl %X)\n",
1603 sata_spd_string(tmp
), sstatus
, scontrol
);
1605 ata_port_printk(ap
, KERN_INFO
,
1606 "SATA link down (SStatus %X SControl %X)\n",
1612 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1613 * @ap: SATA port associated with target SATA PHY.
1615 * This function issues commands to standard SATA Sxxx
1616 * PHY registers, to wake up the phy (and device), and
1617 * clear any reset condition.
1620 * PCI/etc. bus probe sem.
1623 void __sata_phy_reset(struct ata_port
*ap
)
1626 unsigned long timeout
= jiffies
+ (HZ
* 5);
1628 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1629 /* issue phy wake/reset */
1630 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1631 /* Couldn't find anything in SATA I/II specs, but
1632 * AHCI-1.1 10.4.2 says at least 1 ms. */
1635 /* phy wake/clear reset */
1636 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1638 /* wait for phy to become ready, if necessary */
1641 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1642 if ((sstatus
& 0xf) != 1)
1644 } while (time_before(jiffies
, timeout
));
1646 /* print link status */
1647 sata_print_link_status(ap
);
1649 /* TODO: phy layer with polling, timeouts, etc. */
1650 if (!ata_port_offline(ap
))
1653 ata_port_disable(ap
);
1655 if (ap
->flags
& ATA_FLAG_DISABLED
)
1658 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1659 ata_port_disable(ap
);
1663 ap
->cbl
= ATA_CBL_SATA
;
1667 * sata_phy_reset - Reset SATA bus.
1668 * @ap: SATA port associated with target SATA PHY.
1670 * This function resets the SATA bus, and then probes
1671 * the bus for devices.
1674 * PCI/etc. bus probe sem.
1677 void sata_phy_reset(struct ata_port
*ap
)
1679 __sata_phy_reset(ap
);
1680 if (ap
->flags
& ATA_FLAG_DISABLED
)
1686 * ata_dev_pair - return other device on cable
1689 * Obtain the other device on the same cable, or if none is
1690 * present NULL is returned
1693 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1695 struct ata_port
*ap
= adev
->ap
;
1696 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1697 if (!ata_dev_enabled(pair
))
1703 * ata_port_disable - Disable port.
1704 * @ap: Port to be disabled.
1706 * Modify @ap data structure such that the system
1707 * thinks that the entire port is disabled, and should
1708 * never attempt to probe or communicate with devices
1711 * LOCKING: host_set lock, or some other form of
1715 void ata_port_disable(struct ata_port
*ap
)
1717 ap
->device
[0].class = ATA_DEV_NONE
;
1718 ap
->device
[1].class = ATA_DEV_NONE
;
1719 ap
->flags
|= ATA_FLAG_DISABLED
;
1723 * sata_down_spd_limit - adjust SATA spd limit downward
1724 * @ap: Port to adjust SATA spd limit for
1726 * Adjust SATA spd limit of @ap downward. Note that this
1727 * function only adjusts the limit. The change must be applied
1728 * using sata_set_spd().
1731 * Inherited from caller.
1734 * 0 on success, negative errno on failure
1736 int sata_down_spd_limit(struct ata_port
*ap
)
1738 u32 sstatus
, spd
, mask
;
1741 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1745 mask
= ap
->sata_spd_limit
;
1748 highbit
= fls(mask
) - 1;
1749 mask
&= ~(1 << highbit
);
1751 spd
= (sstatus
>> 4) & 0xf;
1755 mask
&= (1 << spd
) - 1;
1759 ap
->sata_spd_limit
= mask
;
1761 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1762 sata_spd_string(fls(mask
)));
1767 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1771 if (ap
->sata_spd_limit
== UINT_MAX
)
1774 limit
= fls(ap
->sata_spd_limit
);
1776 spd
= (*scontrol
>> 4) & 0xf;
1777 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1779 return spd
!= limit
;
1783 * sata_set_spd_needed - is SATA spd configuration needed
1784 * @ap: Port in question
1786 * Test whether the spd limit in SControl matches
1787 * @ap->sata_spd_limit. This function is used to determine
1788 * whether hardreset is necessary to apply SATA spd
1792 * Inherited from caller.
1795 * 1 if SATA spd configuration is needed, 0 otherwise.
1797 int sata_set_spd_needed(struct ata_port
*ap
)
1801 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1804 return __sata_set_spd_needed(ap
, &scontrol
);
1808 * sata_set_spd - set SATA spd according to spd limit
1809 * @ap: Port to set SATA spd for
1811 * Set SATA spd of @ap according to sata_spd_limit.
1814 * Inherited from caller.
1817 * 0 if spd doesn't need to be changed, 1 if spd has been
1818 * changed. Negative errno if SCR registers are inaccessible.
1820 int sata_set_spd(struct ata_port
*ap
)
1825 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1828 if (!__sata_set_spd_needed(ap
, &scontrol
))
1831 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1838 * This mode timing computation functionality is ported over from
1839 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1842 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1843 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1844 * for PIO 5, which is a nonstandard extension and UDMA6, which
1845 * is currently supported only by Maxtor drives.
1848 static const struct ata_timing ata_timing
[] = {
1850 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1851 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1852 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1853 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1855 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1856 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1857 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1859 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1861 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1862 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1863 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1865 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1866 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1867 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1869 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1870 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1871 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1873 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1874 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1875 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1877 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1882 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1883 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1885 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1887 q
->setup
= EZ(t
->setup
* 1000, T
);
1888 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1889 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1890 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1891 q
->active
= EZ(t
->active
* 1000, T
);
1892 q
->recover
= EZ(t
->recover
* 1000, T
);
1893 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1894 q
->udma
= EZ(t
->udma
* 1000, UT
);
1897 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1898 struct ata_timing
*m
, unsigned int what
)
1900 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1901 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1902 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1903 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1904 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1905 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1906 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1907 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1910 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1912 const struct ata_timing
*t
;
1914 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1915 if (t
->mode
== 0xFF)
1920 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1921 struct ata_timing
*t
, int T
, int UT
)
1923 const struct ata_timing
*s
;
1924 struct ata_timing p
;
1930 if (!(s
= ata_timing_find_mode(speed
)))
1933 memcpy(t
, s
, sizeof(*s
));
1936 * If the drive is an EIDE drive, it can tell us it needs extended
1937 * PIO/MW_DMA cycle timing.
1940 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1941 memset(&p
, 0, sizeof(p
));
1942 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1943 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1944 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1945 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1946 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1948 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1952 * Convert the timing to bus clock counts.
1955 ata_timing_quantize(t
, t
, T
, UT
);
1958 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1959 * S.M.A.R.T * and some other commands. We have to ensure that the
1960 * DMA cycle timing is slower/equal than the fastest PIO timing.
1963 if (speed
> XFER_PIO_4
) {
1964 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1965 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1969 * Lengthen active & recovery time so that cycle time is correct.
1972 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1973 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1974 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1977 if (t
->active
+ t
->recover
< t
->cycle
) {
1978 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1979 t
->recover
= t
->cycle
- t
->active
;
1986 * ata_down_xfermask_limit - adjust dev xfer masks downward
1987 * @dev: Device to adjust xfer masks
1988 * @force_pio0: Force PIO0
1990 * Adjust xfer masks of @dev downward. Note that this function
1991 * does not apply the change. Invoking ata_set_mode() afterwards
1992 * will apply the limit.
1995 * Inherited from caller.
1998 * 0 on success, negative errno on failure
2000 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2002 unsigned long xfer_mask
;
2005 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2010 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2011 if (xfer_mask
& ATA_MASK_UDMA
)
2012 xfer_mask
&= ~ATA_MASK_MWDMA
;
2014 highbit
= fls(xfer_mask
) - 1;
2015 xfer_mask
&= ~(1 << highbit
);
2017 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2021 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2024 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2025 ata_mode_string(xfer_mask
));
2033 static int ata_dev_set_mode(struct ata_device
*dev
)
2035 unsigned int err_mask
;
2038 dev
->flags
&= ~ATA_DFLAG_PIO
;
2039 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2040 dev
->flags
|= ATA_DFLAG_PIO
;
2042 err_mask
= ata_dev_set_xfermode(dev
);
2044 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2045 "(err_mask=0x%x)\n", err_mask
);
2049 rc
= ata_dev_revalidate(dev
, 0);
2053 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2054 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2056 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2057 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2062 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2063 * @ap: port on which timings will be programmed
2064 * @r_failed_dev: out paramter for failed device
2066 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2067 * ata_set_mode() fails, pointer to the failing device is
2068 * returned in @r_failed_dev.
2071 * PCI/etc. bus probe sem.
2074 * 0 on success, negative errno otherwise
2076 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2078 struct ata_device
*dev
;
2079 int i
, rc
= 0, used_dma
= 0, found
= 0;
2081 /* has private set_mode? */
2082 if (ap
->ops
->set_mode
) {
2083 /* FIXME: make ->set_mode handle no device case and
2084 * return error code and failing device on failure.
2086 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2087 if (ata_dev_enabled(&ap
->device
[i
])) {
2088 ap
->ops
->set_mode(ap
);
2095 /* step 1: calculate xfer_mask */
2096 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2097 unsigned int pio_mask
, dma_mask
;
2099 dev
= &ap
->device
[i
];
2101 if (!ata_dev_enabled(dev
))
2104 ata_dev_xfermask(dev
);
2106 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2107 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2108 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2109 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2118 /* step 2: always set host PIO timings */
2119 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2120 dev
= &ap
->device
[i
];
2121 if (!ata_dev_enabled(dev
))
2124 if (!dev
->pio_mode
) {
2125 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2130 dev
->xfer_mode
= dev
->pio_mode
;
2131 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2132 if (ap
->ops
->set_piomode
)
2133 ap
->ops
->set_piomode(ap
, dev
);
2136 /* step 3: set host DMA timings */
2137 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2138 dev
= &ap
->device
[i
];
2140 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2143 dev
->xfer_mode
= dev
->dma_mode
;
2144 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2145 if (ap
->ops
->set_dmamode
)
2146 ap
->ops
->set_dmamode(ap
, dev
);
2149 /* step 4: update devices' xfer mode */
2150 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2151 dev
= &ap
->device
[i
];
2153 if (!ata_dev_enabled(dev
))
2156 rc
= ata_dev_set_mode(dev
);
2161 /* Record simplex status. If we selected DMA then the other
2162 * host channels are not permitted to do so.
2164 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2165 ap
->host_set
->simplex_claimed
= 1;
2167 /* step5: chip specific finalisation */
2168 if (ap
->ops
->post_set_mode
)
2169 ap
->ops
->post_set_mode(ap
);
2173 *r_failed_dev
= dev
;
2178 * ata_tf_to_host - issue ATA taskfile to host controller
2179 * @ap: port to which command is being issued
2180 * @tf: ATA taskfile register set
2182 * Issues ATA taskfile register set to ATA host controller,
2183 * with proper synchronization with interrupt handler and
2187 * spin_lock_irqsave(host_set lock)
2190 static inline void ata_tf_to_host(struct ata_port
*ap
,
2191 const struct ata_taskfile
*tf
)
2193 ap
->ops
->tf_load(ap
, tf
);
2194 ap
->ops
->exec_command(ap
, tf
);
2198 * ata_busy_sleep - sleep until BSY clears, or timeout
2199 * @ap: port containing status register to be polled
2200 * @tmout_pat: impatience timeout
2201 * @tmout: overall timeout
2203 * Sleep until ATA Status register bit BSY clears,
2204 * or a timeout occurs.
2209 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2210 unsigned long tmout_pat
, unsigned long tmout
)
2212 unsigned long timer_start
, timeout
;
2215 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2216 timer_start
= jiffies
;
2217 timeout
= timer_start
+ tmout_pat
;
2218 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2220 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2223 if (status
& ATA_BUSY
)
2224 ata_port_printk(ap
, KERN_WARNING
,
2225 "port is slow to respond, please be patient\n");
2227 timeout
= timer_start
+ tmout
;
2228 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2230 status
= ata_chk_status(ap
);
2233 if (status
& ATA_BUSY
) {
2234 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2235 "(%lu secs)\n", tmout
/ HZ
);
2242 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2244 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2245 unsigned int dev0
= devmask
& (1 << 0);
2246 unsigned int dev1
= devmask
& (1 << 1);
2247 unsigned long timeout
;
2249 /* if device 0 was found in ata_devchk, wait for its
2253 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2255 /* if device 1 was found in ata_devchk, wait for
2256 * register access, then wait for BSY to clear
2258 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2262 ap
->ops
->dev_select(ap
, 1);
2263 if (ap
->flags
& ATA_FLAG_MMIO
) {
2264 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2265 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2267 nsect
= inb(ioaddr
->nsect_addr
);
2268 lbal
= inb(ioaddr
->lbal_addr
);
2270 if ((nsect
== 1) && (lbal
== 1))
2272 if (time_after(jiffies
, timeout
)) {
2276 msleep(50); /* give drive a breather */
2279 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2281 /* is all this really necessary? */
2282 ap
->ops
->dev_select(ap
, 0);
2284 ap
->ops
->dev_select(ap
, 1);
2286 ap
->ops
->dev_select(ap
, 0);
2289 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2290 unsigned int devmask
)
2292 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2294 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2296 /* software reset. causes dev0 to be selected */
2297 if (ap
->flags
& ATA_FLAG_MMIO
) {
2298 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2299 udelay(20); /* FIXME: flush */
2300 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2301 udelay(20); /* FIXME: flush */
2302 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2304 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2306 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2308 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2311 /* spec mandates ">= 2ms" before checking status.
2312 * We wait 150ms, because that was the magic delay used for
2313 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2314 * between when the ATA command register is written, and then
2315 * status is checked. Because waiting for "a while" before
2316 * checking status is fine, post SRST, we perform this magic
2317 * delay here as well.
2319 * Old drivers/ide uses the 2mS rule and then waits for ready
2323 /* Before we perform post reset processing we want to see if
2324 * the bus shows 0xFF because the odd clown forgets the D7
2325 * pulldown resistor.
2327 if (ata_check_status(ap
) == 0xFF) {
2328 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2329 return AC_ERR_OTHER
;
2332 ata_bus_post_reset(ap
, devmask
);
2338 * ata_bus_reset - reset host port and associated ATA channel
2339 * @ap: port to reset
2341 * This is typically the first time we actually start issuing
2342 * commands to the ATA channel. We wait for BSY to clear, then
2343 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2344 * result. Determine what devices, if any, are on the channel
2345 * by looking at the device 0/1 error register. Look at the signature
2346 * stored in each device's taskfile registers, to determine if
2347 * the device is ATA or ATAPI.
2350 * PCI/etc. bus probe sem.
2351 * Obtains host_set lock.
2354 * Sets ATA_FLAG_DISABLED if bus reset fails.
2357 void ata_bus_reset(struct ata_port
*ap
)
2359 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2360 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2362 unsigned int dev0
, dev1
= 0, devmask
= 0;
2364 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2366 /* determine if device 0/1 are present */
2367 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2370 dev0
= ata_devchk(ap
, 0);
2372 dev1
= ata_devchk(ap
, 1);
2376 devmask
|= (1 << 0);
2378 devmask
|= (1 << 1);
2380 /* select device 0 again */
2381 ap
->ops
->dev_select(ap
, 0);
2383 /* issue bus reset */
2384 if (ap
->flags
& ATA_FLAG_SRST
)
2385 if (ata_bus_softreset(ap
, devmask
))
2389 * determine by signature whether we have ATA or ATAPI devices
2391 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2392 if ((slave_possible
) && (err
!= 0x81))
2393 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2395 /* re-enable interrupts */
2396 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2399 /* is double-select really necessary? */
2400 if (ap
->device
[1].class != ATA_DEV_NONE
)
2401 ap
->ops
->dev_select(ap
, 1);
2402 if (ap
->device
[0].class != ATA_DEV_NONE
)
2403 ap
->ops
->dev_select(ap
, 0);
2405 /* if no devices were detected, disable this port */
2406 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2407 (ap
->device
[1].class == ATA_DEV_NONE
))
2410 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2411 /* set up device control for ATA_FLAG_SATA_RESET */
2412 if (ap
->flags
& ATA_FLAG_MMIO
)
2413 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2415 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2422 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2423 ap
->ops
->port_disable(ap
);
2428 static int sata_phy_resume(struct ata_port
*ap
)
2430 unsigned long timeout
= jiffies
+ (HZ
* 5);
2431 u32 scontrol
, sstatus
;
2434 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2437 scontrol
= (scontrol
& 0x0f0) | 0x300;
2439 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2442 /* Wait for phy to become ready, if necessary. */
2445 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2447 if ((sstatus
& 0xf) != 1)
2449 } while (time_before(jiffies
, timeout
));
2455 * ata_std_probeinit - initialize probing
2456 * @ap: port to be probed
2458 * @ap is about to be probed. Initialize it. This function is
2459 * to be used as standard callback for ata_drive_probe_reset().
2461 * NOTE!!! Do not use this function as probeinit if a low level
2462 * driver implements only hardreset. Just pass NULL as probeinit
2463 * in that case. Using this function is probably okay but doing
2464 * so makes reset sequence different from the original
2465 * ->phy_reset implementation and Jeff nervous. :-P
2467 void ata_std_probeinit(struct ata_port
*ap
)
2470 sata_phy_resume(ap
);
2472 /* wait for device */
2473 if (ata_port_online(ap
))
2474 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2478 * ata_std_softreset - reset host port via ATA SRST
2479 * @ap: port to reset
2480 * @classes: resulting classes of attached devices
2482 * Reset host port using ATA SRST. This function is to be used
2483 * as standard callback for ata_drive_*_reset() functions.
2486 * Kernel thread context (may sleep)
2489 * 0 on success, -errno otherwise.
2491 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2493 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2494 unsigned int devmask
= 0, err_mask
;
2499 if (ata_port_offline(ap
)) {
2500 classes
[0] = ATA_DEV_NONE
;
2504 /* determine if device 0/1 are present */
2505 if (ata_devchk(ap
, 0))
2506 devmask
|= (1 << 0);
2507 if (slave_possible
&& ata_devchk(ap
, 1))
2508 devmask
|= (1 << 1);
2510 /* select device 0 again */
2511 ap
->ops
->dev_select(ap
, 0);
2513 /* issue bus reset */
2514 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2515 err_mask
= ata_bus_softreset(ap
, devmask
);
2517 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2522 /* determine by signature whether we have ATA or ATAPI devices */
2523 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2524 if (slave_possible
&& err
!= 0x81)
2525 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2528 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2533 * sata_std_hardreset - reset host port via SATA phy reset
2534 * @ap: port to reset
2535 * @class: resulting class of attached device
2537 * SATA phy-reset host port using DET bits of SControl register.
2538 * This function is to be used as standard callback for
2539 * ata_drive_*_reset().
2542 * Kernel thread context (may sleep)
2545 * 0 on success, -errno otherwise.
2547 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2554 if (sata_set_spd_needed(ap
)) {
2555 /* SATA spec says nothing about how to reconfigure
2556 * spd. To be on the safe side, turn off phy during
2557 * reconfiguration. This works for at least ICH7 AHCI
2560 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2563 scontrol
= (scontrol
& 0x0f0) | 0x302;
2565 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2571 /* issue phy wake/reset */
2572 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2575 scontrol
= (scontrol
& 0x0f0) | 0x301;
2577 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2580 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2581 * 10.4.2 says at least 1 ms.
2585 /* bring phy back */
2586 sata_phy_resume(ap
);
2588 /* TODO: phy layer with polling, timeouts, etc. */
2589 if (ata_port_offline(ap
)) {
2590 *class = ATA_DEV_NONE
;
2591 DPRINTK("EXIT, link offline\n");
2595 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2596 ata_port_printk(ap
, KERN_ERR
,
2597 "COMRESET failed (device not ready)\n");
2601 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2603 *class = ata_dev_try_classify(ap
, 0, NULL
);
2605 DPRINTK("EXIT, class=%u\n", *class);
2610 * ata_std_postreset - standard postreset callback
2611 * @ap: the target ata_port
2612 * @classes: classes of attached devices
2614 * This function is invoked after a successful reset. Note that
2615 * the device might have been reset more than once using
2616 * different reset methods before postreset is invoked.
2618 * This function is to be used as standard callback for
2619 * ata_drive_*_reset().
2622 * Kernel thread context (may sleep)
2624 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2630 /* print link status */
2631 sata_print_link_status(ap
);
2634 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2635 sata_scr_write(ap
, SCR_ERROR
, serror
);
2637 /* re-enable interrupts */
2638 if (!ap
->ops
->error_handler
) {
2639 /* FIXME: hack. create a hook instead */
2640 if (ap
->ioaddr
.ctl_addr
)
2644 /* is double-select really necessary? */
2645 if (classes
[0] != ATA_DEV_NONE
)
2646 ap
->ops
->dev_select(ap
, 1);
2647 if (classes
[1] != ATA_DEV_NONE
)
2648 ap
->ops
->dev_select(ap
, 0);
2650 /* bail out if no device is present */
2651 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2652 DPRINTK("EXIT, no device\n");
2656 /* set up device control */
2657 if (ap
->ioaddr
.ctl_addr
) {
2658 if (ap
->flags
& ATA_FLAG_MMIO
)
2659 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2661 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2668 * ata_std_probe_reset - standard probe reset method
2669 * @ap: prot to perform probe-reset
2670 * @classes: resulting classes of attached devices
2672 * The stock off-the-shelf ->probe_reset method.
2675 * Kernel thread context (may sleep)
2678 * 0 on success, -errno otherwise.
2680 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2682 ata_reset_fn_t hardreset
;
2685 if (sata_scr_valid(ap
))
2686 hardreset
= sata_std_hardreset
;
2688 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2689 ata_std_softreset
, hardreset
,
2690 ata_std_postreset
, classes
);
2693 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2694 unsigned int *classes
)
2698 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2699 classes
[i
] = ATA_DEV_UNKNOWN
;
2701 rc
= reset(ap
, classes
);
2705 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2706 * is complete and convert all ATA_DEV_UNKNOWN to
2709 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2710 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2713 if (i
< ATA_MAX_DEVICES
)
2714 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2715 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2716 classes
[i
] = ATA_DEV_NONE
;
2722 * ata_drive_probe_reset - Perform probe reset with given methods
2723 * @ap: port to reset
2724 * @probeinit: probeinit method (can be NULL)
2725 * @softreset: softreset method (can be NULL)
2726 * @hardreset: hardreset method (can be NULL)
2727 * @postreset: postreset method (can be NULL)
2728 * @classes: resulting classes of attached devices
2730 * Reset the specified port and classify attached devices using
2731 * given methods. This function prefers softreset but tries all
2732 * possible reset sequences to reset and classify devices. This
2733 * function is intended to be used for constructing ->probe_reset
2734 * callback by low level drivers.
2736 * Reset methods should follow the following rules.
2738 * - Return 0 on sucess, -errno on failure.
2739 * - If classification is supported, fill classes[] with
2740 * recognized class codes.
2741 * - If classification is not supported, leave classes[] alone.
2744 * Kernel thread context (may sleep)
2747 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2748 * if classification fails, and any error code from reset
2751 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2752 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2753 ata_postreset_fn_t postreset
, unsigned int *classes
)
2757 ata_eh_freeze_port(ap
);
2762 if (softreset
&& !sata_set_spd_needed(ap
)) {
2763 rc
= ata_do_reset(ap
, softreset
, classes
);
2764 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2766 ata_port_printk(ap
, KERN_INFO
, "softreset failed, "
2767 "will try hardreset in 5 secs\n");
2775 rc
= ata_do_reset(ap
, hardreset
, classes
);
2777 if (classes
[0] != ATA_DEV_UNKNOWN
)
2782 if (sata_down_spd_limit(ap
))
2785 ata_port_printk(ap
, KERN_INFO
, "hardreset failed, "
2786 "will retry in 5 secs\n");
2791 ata_port_printk(ap
, KERN_INFO
,
2792 "hardreset succeeded without classification, "
2793 "will retry softreset in 5 secs\n");
2796 rc
= ata_do_reset(ap
, softreset
, classes
);
2802 postreset(ap
, classes
);
2804 ata_eh_thaw_port(ap
);
2806 if (classes
[0] == ATA_DEV_UNKNOWN
)
2813 * ata_dev_same_device - Determine whether new ID matches configured device
2814 * @dev: device to compare against
2815 * @new_class: class of the new device
2816 * @new_id: IDENTIFY page of the new device
2818 * Compare @new_class and @new_id against @dev and determine
2819 * whether @dev is the device indicated by @new_class and
2826 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2828 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2831 const u16
*old_id
= dev
->id
;
2832 unsigned char model
[2][41], serial
[2][21];
2835 if (dev
->class != new_class
) {
2836 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2837 dev
->class, new_class
);
2841 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2842 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2843 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2844 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2845 new_n_sectors
= ata_id_n_sectors(new_id
);
2847 if (strcmp(model
[0], model
[1])) {
2848 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2849 "'%s' != '%s'\n", model
[0], model
[1]);
2853 if (strcmp(serial
[0], serial
[1])) {
2854 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2855 "'%s' != '%s'\n", serial
[0], serial
[1]);
2859 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2860 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2862 (unsigned long long)dev
->n_sectors
,
2863 (unsigned long long)new_n_sectors
);
2871 * ata_dev_revalidate - Revalidate ATA device
2872 * @dev: device to revalidate
2873 * @post_reset: is this revalidation after reset?
2875 * Re-read IDENTIFY page and make sure @dev is still attached to
2879 * Kernel thread context (may sleep)
2882 * 0 on success, negative errno otherwise
2884 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2886 unsigned int class = dev
->class;
2887 u16
*id
= (void *)dev
->ap
->sector_buf
;
2890 if (!ata_dev_enabled(dev
)) {
2896 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2900 /* is the device still there? */
2901 if (!ata_dev_same_device(dev
, class, id
)) {
2906 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2908 /* configure device according to the new ID */
2909 rc
= ata_dev_configure(dev
, 0);
2914 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2918 static const char * const ata_dma_blacklist
[] = {
2919 "WDC AC11000H", NULL
,
2920 "WDC AC22100H", NULL
,
2921 "WDC AC32500H", NULL
,
2922 "WDC AC33100H", NULL
,
2923 "WDC AC31600H", NULL
,
2924 "WDC AC32100H", "24.09P07",
2925 "WDC AC23200L", "21.10N21",
2926 "Compaq CRD-8241B", NULL
,
2931 "SanDisk SDP3B", NULL
,
2932 "SanDisk SDP3B-64", NULL
,
2933 "SANYO CD-ROM CRD", NULL
,
2934 "HITACHI CDR-8", NULL
,
2935 "HITACHI CDR-8335", NULL
,
2936 "HITACHI CDR-8435", NULL
,
2937 "Toshiba CD-ROM XM-6202B", NULL
,
2938 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2940 "E-IDE CD-ROM CR-840", NULL
,
2941 "CD-ROM Drive/F5A", NULL
,
2942 "WPI CDD-820", NULL
,
2943 "SAMSUNG CD-ROM SC-148C", NULL
,
2944 "SAMSUNG CD-ROM SC", NULL
,
2945 "SanDisk SDP3B-64", NULL
,
2946 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2947 "_NEC DV5800A", NULL
,
2948 "SAMSUNG CD-ROM SN-124", "N001"
2951 static int ata_strim(char *s
, size_t len
)
2953 len
= strnlen(s
, len
);
2955 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2956 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2963 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2965 unsigned char model_num
[40];
2966 unsigned char model_rev
[16];
2967 unsigned int nlen
, rlen
;
2970 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2972 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2974 nlen
= ata_strim(model_num
, sizeof(model_num
));
2975 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2977 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2978 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2979 if (ata_dma_blacklist
[i
+1] == NULL
)
2981 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2989 * ata_dev_xfermask - Compute supported xfermask of the given device
2990 * @dev: Device to compute xfermask for
2992 * Compute supported xfermask of @dev and store it in
2993 * dev->*_mask. This function is responsible for applying all
2994 * known limits including host controller limits, device
2997 * FIXME: The current implementation limits all transfer modes to
2998 * the fastest of the lowested device on the port. This is not
2999 * required on most controllers.
3004 static void ata_dev_xfermask(struct ata_device
*dev
)
3006 struct ata_port
*ap
= dev
->ap
;
3007 struct ata_host_set
*hs
= ap
->host_set
;
3008 unsigned long xfer_mask
;
3011 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3012 ap
->mwdma_mask
, ap
->udma_mask
);
3014 /* Apply cable rule here. Don't apply it early because when
3015 * we handle hot plug the cable type can itself change.
3017 if (ap
->cbl
== ATA_CBL_PATA40
)
3018 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3020 /* FIXME: Use port-wide xfermask for now */
3021 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
3022 struct ata_device
*d
= &ap
->device
[i
];
3024 if (ata_dev_absent(d
))
3027 if (ata_dev_disabled(d
)) {
3028 /* to avoid violating device selection timing */
3029 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3030 UINT_MAX
, UINT_MAX
);
3034 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3035 d
->mwdma_mask
, d
->udma_mask
);
3036 xfer_mask
&= ata_id_xfermask(d
->id
);
3037 if (ata_dma_blacklisted(d
))
3038 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3041 if (ata_dma_blacklisted(dev
))
3042 ata_dev_printk(dev
, KERN_WARNING
,
3043 "device is on DMA blacklist, disabling DMA\n");
3045 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3046 if (hs
->simplex_claimed
)
3047 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3050 if (ap
->ops
->mode_filter
)
3051 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3053 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3054 &dev
->mwdma_mask
, &dev
->udma_mask
);
3058 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3059 * @dev: Device to which command will be sent
3061 * Issue SET FEATURES - XFER MODE command to device @dev
3065 * PCI/etc. bus probe sem.
3068 * 0 on success, AC_ERR_* mask otherwise.
3071 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3073 struct ata_taskfile tf
;
3074 unsigned int err_mask
;
3076 /* set up set-features taskfile */
3077 DPRINTK("set features - xfer mode\n");
3079 ata_tf_init(dev
, &tf
);
3080 tf
.command
= ATA_CMD_SET_FEATURES
;
3081 tf
.feature
= SETFEATURES_XFER
;
3082 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3083 tf
.protocol
= ATA_PROT_NODATA
;
3084 tf
.nsect
= dev
->xfer_mode
;
3086 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3088 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3093 * ata_dev_init_params - Issue INIT DEV PARAMS command
3094 * @dev: Device to which command will be sent
3095 * @heads: Number of heads (taskfile parameter)
3096 * @sectors: Number of sectors (taskfile parameter)
3099 * Kernel thread context (may sleep)
3102 * 0 on success, AC_ERR_* mask otherwise.
3104 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3105 u16 heads
, u16 sectors
)
3107 struct ata_taskfile tf
;
3108 unsigned int err_mask
;
3110 /* Number of sectors per track 1-255. Number of heads 1-16 */
3111 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3112 return AC_ERR_INVALID
;
3114 /* set up init dev params taskfile */
3115 DPRINTK("init dev params \n");
3117 ata_tf_init(dev
, &tf
);
3118 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3119 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3120 tf
.protocol
= ATA_PROT_NODATA
;
3122 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3124 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3126 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3131 * ata_sg_clean - Unmap DMA memory associated with command
3132 * @qc: Command containing DMA memory to be released
3134 * Unmap all mapped DMA memory associated with this command.
3137 * spin_lock_irqsave(host_set lock)
3140 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3142 struct ata_port
*ap
= qc
->ap
;
3143 struct scatterlist
*sg
= qc
->__sg
;
3144 int dir
= qc
->dma_dir
;
3145 void *pad_buf
= NULL
;
3147 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3148 WARN_ON(sg
== NULL
);
3150 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3151 WARN_ON(qc
->n_elem
> 1);
3153 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3155 /* if we padded the buffer out to 32-bit bound, and data
3156 * xfer direction is from-device, we must copy from the
3157 * pad buffer back into the supplied buffer
3159 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3160 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3162 if (qc
->flags
& ATA_QCFLAG_SG
) {
3164 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3165 /* restore last sg */
3166 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3168 struct scatterlist
*psg
= &qc
->pad_sgent
;
3169 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3170 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3171 kunmap_atomic(addr
, KM_IRQ0
);
3175 dma_unmap_single(ap
->dev
,
3176 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3179 sg
->length
+= qc
->pad_len
;
3181 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3182 pad_buf
, qc
->pad_len
);
3185 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3190 * ata_fill_sg - Fill PCI IDE PRD table
3191 * @qc: Metadata associated with taskfile to be transferred
3193 * Fill PCI IDE PRD (scatter-gather) table with segments
3194 * associated with the current disk command.
3197 * spin_lock_irqsave(host_set lock)
3200 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3202 struct ata_port
*ap
= qc
->ap
;
3203 struct scatterlist
*sg
;
3206 WARN_ON(qc
->__sg
== NULL
);
3207 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3210 ata_for_each_sg(sg
, qc
) {
3214 /* determine if physical DMA addr spans 64K boundary.
3215 * Note h/w doesn't support 64-bit, so we unconditionally
3216 * truncate dma_addr_t to u32.
3218 addr
= (u32
) sg_dma_address(sg
);
3219 sg_len
= sg_dma_len(sg
);
3222 offset
= addr
& 0xffff;
3224 if ((offset
+ sg_len
) > 0x10000)
3225 len
= 0x10000 - offset
;
3227 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3228 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3229 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3238 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3241 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3242 * @qc: Metadata associated with taskfile to check
3244 * Allow low-level driver to filter ATA PACKET commands, returning
3245 * a status indicating whether or not it is OK to use DMA for the
3246 * supplied PACKET command.
3249 * spin_lock_irqsave(host_set lock)
3251 * RETURNS: 0 when ATAPI DMA can be used
3254 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3256 struct ata_port
*ap
= qc
->ap
;
3257 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3259 if (ap
->ops
->check_atapi_dma
)
3260 rc
= ap
->ops
->check_atapi_dma(qc
);
3262 /* We don't support polling DMA.
3263 * Use PIO if the LLDD handles only interrupts in
3264 * the HSM_ST_LAST state and the ATAPI device
3265 * generates CDB interrupts.
3267 if ((ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3268 (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3274 * ata_qc_prep - Prepare taskfile for submission
3275 * @qc: Metadata associated with taskfile to be prepared
3277 * Prepare ATA taskfile for submission.
3280 * spin_lock_irqsave(host_set lock)
3282 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3284 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3290 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3293 * ata_sg_init_one - Associate command with memory buffer
3294 * @qc: Command to be associated
3295 * @buf: Memory buffer
3296 * @buflen: Length of memory buffer, in bytes.
3298 * Initialize the data-related elements of queued_cmd @qc
3299 * to point to a single memory buffer, @buf of byte length @buflen.
3302 * spin_lock_irqsave(host_set lock)
3305 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3307 struct scatterlist
*sg
;
3309 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3311 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3312 qc
->__sg
= &qc
->sgent
;
3314 qc
->orig_n_elem
= 1;
3318 sg_init_one(sg
, buf
, buflen
);
3322 * ata_sg_init - Associate command with scatter-gather table.
3323 * @qc: Command to be associated
3324 * @sg: Scatter-gather table.
3325 * @n_elem: Number of elements in s/g table.
3327 * Initialize the data-related elements of queued_cmd @qc
3328 * to point to a scatter-gather table @sg, containing @n_elem
3332 * spin_lock_irqsave(host_set lock)
3335 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3336 unsigned int n_elem
)
3338 qc
->flags
|= ATA_QCFLAG_SG
;
3340 qc
->n_elem
= n_elem
;
3341 qc
->orig_n_elem
= n_elem
;
3345 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3346 * @qc: Command with memory buffer to be mapped.
3348 * DMA-map the memory buffer associated with queued_cmd @qc.
3351 * spin_lock_irqsave(host_set lock)
3354 * Zero on success, negative on error.
3357 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3359 struct ata_port
*ap
= qc
->ap
;
3360 int dir
= qc
->dma_dir
;
3361 struct scatterlist
*sg
= qc
->__sg
;
3362 dma_addr_t dma_address
;
3365 /* we must lengthen transfers to end on a 32-bit boundary */
3366 qc
->pad_len
= sg
->length
& 3;
3368 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3369 struct scatterlist
*psg
= &qc
->pad_sgent
;
3371 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3373 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3375 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3376 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3379 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3380 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3382 sg
->length
-= qc
->pad_len
;
3383 if (sg
->length
== 0)
3386 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3387 sg
->length
, qc
->pad_len
);
3395 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3397 if (dma_mapping_error(dma_address
)) {
3399 sg
->length
+= qc
->pad_len
;
3403 sg_dma_address(sg
) = dma_address
;
3404 sg_dma_len(sg
) = sg
->length
;
3407 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3408 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3414 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3415 * @qc: Command with scatter-gather table to be mapped.
3417 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3420 * spin_lock_irqsave(host_set lock)
3423 * Zero on success, negative on error.
3427 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3429 struct ata_port
*ap
= qc
->ap
;
3430 struct scatterlist
*sg
= qc
->__sg
;
3431 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3432 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3434 VPRINTK("ENTER, ata%u\n", ap
->id
);
3435 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3437 /* we must lengthen transfers to end on a 32-bit boundary */
3438 qc
->pad_len
= lsg
->length
& 3;
3440 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3441 struct scatterlist
*psg
= &qc
->pad_sgent
;
3442 unsigned int offset
;
3444 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3446 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3449 * psg->page/offset are used to copy to-be-written
3450 * data in this function or read data in ata_sg_clean.
3452 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3453 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3454 psg
->offset
= offset_in_page(offset
);
3456 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3457 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3458 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3459 kunmap_atomic(addr
, KM_IRQ0
);
3462 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3463 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3465 lsg
->length
-= qc
->pad_len
;
3466 if (lsg
->length
== 0)
3469 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3470 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3473 pre_n_elem
= qc
->n_elem
;
3474 if (trim_sg
&& pre_n_elem
)
3483 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3485 /* restore last sg */
3486 lsg
->length
+= qc
->pad_len
;
3490 DPRINTK("%d sg elements mapped\n", n_elem
);
3493 qc
->n_elem
= n_elem
;
3499 * swap_buf_le16 - swap halves of 16-bit words in place
3500 * @buf: Buffer to swap
3501 * @buf_words: Number of 16-bit words in buffer.
3503 * Swap halves of 16-bit words if needed to convert from
3504 * little-endian byte order to native cpu byte order, or
3508 * Inherited from caller.
3510 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3515 for (i
= 0; i
< buf_words
; i
++)
3516 buf
[i
] = le16_to_cpu(buf
[i
]);
3517 #endif /* __BIG_ENDIAN */
3521 * ata_mmio_data_xfer - Transfer data by MMIO
3522 * @dev: device for this I/O
3524 * @buflen: buffer length
3525 * @write_data: read/write
3527 * Transfer data from/to the device data register by MMIO.
3530 * Inherited from caller.
3533 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3534 unsigned int buflen
, int write_data
)
3536 struct ata_port
*ap
= adev
->ap
;
3538 unsigned int words
= buflen
>> 1;
3539 u16
*buf16
= (u16
*) buf
;
3540 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3542 /* Transfer multiple of 2 bytes */
3544 for (i
= 0; i
< words
; i
++)
3545 writew(le16_to_cpu(buf16
[i
]), mmio
);
3547 for (i
= 0; i
< words
; i
++)
3548 buf16
[i
] = cpu_to_le16(readw(mmio
));
3551 /* Transfer trailing 1 byte, if any. */
3552 if (unlikely(buflen
& 0x01)) {
3553 u16 align_buf
[1] = { 0 };
3554 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3557 memcpy(align_buf
, trailing_buf
, 1);
3558 writew(le16_to_cpu(align_buf
[0]), mmio
);
3560 align_buf
[0] = cpu_to_le16(readw(mmio
));
3561 memcpy(trailing_buf
, align_buf
, 1);
3567 * ata_pio_data_xfer - Transfer data by PIO
3568 * @adev: device to target
3570 * @buflen: buffer length
3571 * @write_data: read/write
3573 * Transfer data from/to the device data register by PIO.
3576 * Inherited from caller.
3579 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3580 unsigned int buflen
, int write_data
)
3582 struct ata_port
*ap
= adev
->ap
;
3583 unsigned int words
= buflen
>> 1;
3585 /* Transfer multiple of 2 bytes */
3587 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3589 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3591 /* Transfer trailing 1 byte, if any. */
3592 if (unlikely(buflen
& 0x01)) {
3593 u16 align_buf
[1] = { 0 };
3594 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3597 memcpy(align_buf
, trailing_buf
, 1);
3598 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3600 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3601 memcpy(trailing_buf
, align_buf
, 1);
3607 * ata_pio_data_xfer_noirq - Transfer data by PIO
3608 * @adev: device to target
3610 * @buflen: buffer length
3611 * @write_data: read/write
3613 * Transfer data from/to the device data register by PIO. Do the
3614 * transfer with interrupts disabled.
3617 * Inherited from caller.
3620 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3621 unsigned int buflen
, int write_data
)
3623 unsigned long flags
;
3624 local_irq_save(flags
);
3625 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3626 local_irq_restore(flags
);
3631 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3632 * @qc: Command on going
3634 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3637 * Inherited from caller.
3640 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3642 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3643 struct scatterlist
*sg
= qc
->__sg
;
3644 struct ata_port
*ap
= qc
->ap
;
3646 unsigned int offset
;
3649 if (qc
->cursect
== (qc
->nsect
- 1))
3650 ap
->hsm_task_state
= HSM_ST_LAST
;
3652 page
= sg
[qc
->cursg
].page
;
3653 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3655 /* get the current page and offset */
3656 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3657 offset
%= PAGE_SIZE
;
3659 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3661 if (PageHighMem(page
)) {
3662 unsigned long flags
;
3664 /* FIXME: use a bounce buffer */
3665 local_irq_save(flags
);
3666 buf
= kmap_atomic(page
, KM_IRQ0
);
3668 /* do the actual data transfer */
3669 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3671 kunmap_atomic(buf
, KM_IRQ0
);
3672 local_irq_restore(flags
);
3674 buf
= page_address(page
);
3675 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3681 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3688 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3689 * @qc: Command on going
3691 * Transfer one or many ATA_SECT_SIZE of data from/to the
3692 * ATA device for the DRQ request.
3695 * Inherited from caller.
3698 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3700 if (is_multi_taskfile(&qc
->tf
)) {
3701 /* READ/WRITE MULTIPLE */
3704 WARN_ON(qc
->dev
->multi_count
== 0);
3706 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3714 * atapi_send_cdb - Write CDB bytes to hardware
3715 * @ap: Port to which ATAPI device is attached.
3716 * @qc: Taskfile currently active
3718 * When device has indicated its readiness to accept
3719 * a CDB, this function is called. Send the CDB.
3725 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3728 DPRINTK("send cdb\n");
3729 WARN_ON(qc
->dev
->cdb_len
< 12);
3731 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3732 ata_altstatus(ap
); /* flush */
3734 switch (qc
->tf
.protocol
) {
3735 case ATA_PROT_ATAPI
:
3736 ap
->hsm_task_state
= HSM_ST
;
3738 case ATA_PROT_ATAPI_NODATA
:
3739 ap
->hsm_task_state
= HSM_ST_LAST
;
3741 case ATA_PROT_ATAPI_DMA
:
3742 ap
->hsm_task_state
= HSM_ST_LAST
;
3743 /* initiate bmdma */
3744 ap
->ops
->bmdma_start(qc
);
3750 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3751 * @qc: Command on going
3752 * @bytes: number of bytes
3754 * Transfer Transfer data from/to the ATAPI device.
3757 * Inherited from caller.
3761 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3763 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3764 struct scatterlist
*sg
= qc
->__sg
;
3765 struct ata_port
*ap
= qc
->ap
;
3768 unsigned int offset
, count
;
3770 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3771 ap
->hsm_task_state
= HSM_ST_LAST
;
3774 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3776 * The end of qc->sg is reached and the device expects
3777 * more data to transfer. In order not to overrun qc->sg
3778 * and fulfill length specified in the byte count register,
3779 * - for read case, discard trailing data from the device
3780 * - for write case, padding zero data to the device
3782 u16 pad_buf
[1] = { 0 };
3783 unsigned int words
= bytes
>> 1;
3786 if (words
) /* warning if bytes > 1 */
3787 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3788 "%u bytes trailing data\n", bytes
);
3790 for (i
= 0; i
< words
; i
++)
3791 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3793 ap
->hsm_task_state
= HSM_ST_LAST
;
3797 sg
= &qc
->__sg
[qc
->cursg
];
3800 offset
= sg
->offset
+ qc
->cursg_ofs
;
3802 /* get the current page and offset */
3803 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3804 offset
%= PAGE_SIZE
;
3806 /* don't overrun current sg */
3807 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3809 /* don't cross page boundaries */
3810 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3812 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3814 if (PageHighMem(page
)) {
3815 unsigned long flags
;
3817 /* FIXME: use bounce buffer */
3818 local_irq_save(flags
);
3819 buf
= kmap_atomic(page
, KM_IRQ0
);
3821 /* do the actual data transfer */
3822 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3824 kunmap_atomic(buf
, KM_IRQ0
);
3825 local_irq_restore(flags
);
3827 buf
= page_address(page
);
3828 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3832 qc
->curbytes
+= count
;
3833 qc
->cursg_ofs
+= count
;
3835 if (qc
->cursg_ofs
== sg
->length
) {
3845 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3846 * @qc: Command on going
3848 * Transfer Transfer data from/to the ATAPI device.
3851 * Inherited from caller.
3854 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3856 struct ata_port
*ap
= qc
->ap
;
3857 struct ata_device
*dev
= qc
->dev
;
3858 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3859 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3861 /* Abuse qc->result_tf for temp storage of intermediate TF
3862 * here to save some kernel stack usage.
3863 * For normal completion, qc->result_tf is not relevant. For
3864 * error, qc->result_tf is later overwritten by ata_qc_complete().
3865 * So, the correctness of qc->result_tf is not affected.
3867 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3868 ireason
= qc
->result_tf
.nsect
;
3869 bc_lo
= qc
->result_tf
.lbam
;
3870 bc_hi
= qc
->result_tf
.lbah
;
3871 bytes
= (bc_hi
<< 8) | bc_lo
;
3873 /* shall be cleared to zero, indicating xfer of data */
3874 if (ireason
& (1 << 0))
3877 /* make sure transfer direction matches expected */
3878 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3879 if (do_write
!= i_write
)
3882 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3884 __atapi_pio_bytes(qc
, bytes
);
3889 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3890 qc
->err_mask
|= AC_ERR_HSM
;
3891 ap
->hsm_task_state
= HSM_ST_ERR
;
3895 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3896 * @ap: the target ata_port
3900 * 1 if ok in workqueue, 0 otherwise.
3903 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3905 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3908 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3909 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3910 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3913 if (is_atapi_taskfile(&qc
->tf
) &&
3914 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3922 * ata_hsm_qc_complete - finish a qc running on standard HSM
3923 * @qc: Command to complete
3924 * @in_wq: 1 if called from workqueue, 0 otherwise
3926 * Finish @qc which is running on standard HSM.
3929 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3930 * Otherwise, none on entry and grabs host lock.
3932 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3934 struct ata_port
*ap
= qc
->ap
;
3935 unsigned long flags
;
3937 if (ap
->ops
->error_handler
) {
3939 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3941 /* EH might have kicked in while host_set lock
3944 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3946 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3948 ata_qc_complete(qc
);
3950 ata_port_freeze(ap
);
3953 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3955 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3956 ata_qc_complete(qc
);
3958 ata_port_freeze(ap
);
3962 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3964 ata_qc_complete(qc
);
3965 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3967 ata_qc_complete(qc
);
3970 ata_altstatus(ap
); /* flush */
3974 * ata_hsm_move - move the HSM to the next state.
3975 * @ap: the target ata_port
3977 * @status: current device status
3978 * @in_wq: 1 if called from workqueue, 0 otherwise
3981 * 1 when poll next status needed, 0 otherwise.
3984 static int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
3985 u8 status
, int in_wq
)
3987 unsigned long flags
= 0;
3990 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3992 /* Make sure ata_qc_issue_prot() does not throw things
3993 * like DMA polling into the workqueue. Notice that
3994 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3996 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
3999 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4000 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4002 switch (ap
->hsm_task_state
) {
4004 /* Send first data block or PACKET CDB */
4006 /* If polling, we will stay in the work queue after
4007 * sending the data. Otherwise, interrupt handler
4008 * takes over after sending the data.
4010 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4012 /* check device status */
4013 if (unlikely((status
& ATA_DRQ
) == 0)) {
4014 /* handle BSY=0, DRQ=0 as error */
4015 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4016 /* device stops HSM for abort/error */
4017 qc
->err_mask
|= AC_ERR_DEV
;
4019 /* HSM violation. Let EH handle this */
4020 qc
->err_mask
|= AC_ERR_HSM
;
4022 ap
->hsm_task_state
= HSM_ST_ERR
;
4026 /* Device should not ask for data transfer (DRQ=1)
4027 * when it finds something wrong.
4028 * We ignore DRQ here and stop the HSM by
4029 * changing hsm_task_state to HSM_ST_ERR and
4030 * let the EH abort the command or reset the device.
4032 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4033 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4035 qc
->err_mask
|= AC_ERR_HSM
;
4036 ap
->hsm_task_state
= HSM_ST_ERR
;
4040 /* Send the CDB (atapi) or the first data block (ata pio out).
4041 * During the state transition, interrupt handler shouldn't
4042 * be invoked before the data transfer is complete and
4043 * hsm_task_state is changed. Hence, the following locking.
4046 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4048 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4049 /* PIO data out protocol.
4050 * send first data block.
4053 /* ata_pio_sectors() might change the state
4054 * to HSM_ST_LAST. so, the state is changed here
4055 * before ata_pio_sectors().
4057 ap
->hsm_task_state
= HSM_ST
;
4058 ata_pio_sectors(qc
);
4059 ata_altstatus(ap
); /* flush */
4062 atapi_send_cdb(ap
, qc
);
4065 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4067 /* if polling, ata_pio_task() handles the rest.
4068 * otherwise, interrupt handler takes over from here.
4073 /* complete command or read/write the data register */
4074 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4075 /* ATAPI PIO protocol */
4076 if ((status
& ATA_DRQ
) == 0) {
4077 /* No more data to transfer or device error.
4078 * Device error will be tagged in HSM_ST_LAST.
4080 ap
->hsm_task_state
= HSM_ST_LAST
;
4084 /* Device should not ask for data transfer (DRQ=1)
4085 * when it finds something wrong.
4086 * We ignore DRQ here and stop the HSM by
4087 * changing hsm_task_state to HSM_ST_ERR and
4088 * let the EH abort the command or reset the device.
4090 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4091 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4093 qc
->err_mask
|= AC_ERR_HSM
;
4094 ap
->hsm_task_state
= HSM_ST_ERR
;
4098 atapi_pio_bytes(qc
);
4100 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4101 /* bad ireason reported by device */
4105 /* ATA PIO protocol */
4106 if (unlikely((status
& ATA_DRQ
) == 0)) {
4107 /* handle BSY=0, DRQ=0 as error */
4108 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4109 /* device stops HSM for abort/error */
4110 qc
->err_mask
|= AC_ERR_DEV
;
4112 /* HSM violation. Let EH handle this */
4113 qc
->err_mask
|= AC_ERR_HSM
;
4115 ap
->hsm_task_state
= HSM_ST_ERR
;
4119 /* For PIO reads, some devices may ask for
4120 * data transfer (DRQ=1) alone with ERR=1.
4121 * We respect DRQ here and transfer one
4122 * block of junk data before changing the
4123 * hsm_task_state to HSM_ST_ERR.
4125 * For PIO writes, ERR=1 DRQ=1 doesn't make
4126 * sense since the data block has been
4127 * transferred to the device.
4129 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4130 /* data might be corrputed */
4131 qc
->err_mask
|= AC_ERR_DEV
;
4133 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4134 ata_pio_sectors(qc
);
4136 status
= ata_wait_idle(ap
);
4139 if (status
& (ATA_BUSY
| ATA_DRQ
))
4140 qc
->err_mask
|= AC_ERR_HSM
;
4142 /* ata_pio_sectors() might change the
4143 * state to HSM_ST_LAST. so, the state
4144 * is changed after ata_pio_sectors().
4146 ap
->hsm_task_state
= HSM_ST_ERR
;
4150 ata_pio_sectors(qc
);
4152 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4153 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4156 status
= ata_wait_idle(ap
);
4161 ata_altstatus(ap
); /* flush */
4166 if (unlikely(!ata_ok(status
))) {
4167 qc
->err_mask
|= __ac_err_mask(status
);
4168 ap
->hsm_task_state
= HSM_ST_ERR
;
4172 /* no more data to transfer */
4173 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4174 ap
->id
, qc
->dev
->devno
, status
);
4176 WARN_ON(qc
->err_mask
);
4178 ap
->hsm_task_state
= HSM_ST_IDLE
;
4180 /* complete taskfile transaction */
4181 ata_hsm_qc_complete(qc
, in_wq
);
4187 /* make sure qc->err_mask is available to
4188 * know what's wrong and recover
4190 WARN_ON(qc
->err_mask
== 0);
4192 ap
->hsm_task_state
= HSM_ST_IDLE
;
4194 /* complete taskfile transaction */
4195 ata_hsm_qc_complete(qc
, in_wq
);
4207 static void ata_pio_task(void *_data
)
4209 struct ata_queued_cmd
*qc
= _data
;
4210 struct ata_port
*ap
= qc
->ap
;
4215 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4218 * This is purely heuristic. This is a fast path.
4219 * Sometimes when we enter, BSY will be cleared in
4220 * a chk-status or two. If not, the drive is probably seeking
4221 * or something. Snooze for a couple msecs, then
4222 * chk-status again. If still busy, queue delayed work.
4224 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4225 if (status
& ATA_BUSY
) {
4227 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4228 if (status
& ATA_BUSY
) {
4229 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4235 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4237 /* another command or interrupt handler
4238 * may be running at this point.
4245 * ata_qc_new - Request an available ATA command, for queueing
4246 * @ap: Port associated with device @dev
4247 * @dev: Device from whom we request an available command structure
4253 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4255 struct ata_queued_cmd
*qc
= NULL
;
4258 /* no command while frozen */
4259 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4262 /* the last tag is reserved for internal command. */
4263 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4264 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4265 qc
= __ata_qc_from_tag(ap
, i
);
4276 * ata_qc_new_init - Request an available ATA command, and initialize it
4277 * @dev: Device from whom we request an available command structure
4283 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4285 struct ata_port
*ap
= dev
->ap
;
4286 struct ata_queued_cmd
*qc
;
4288 qc
= ata_qc_new(ap
);
4301 * ata_qc_free - free unused ata_queued_cmd
4302 * @qc: Command to complete
4304 * Designed to free unused ata_queued_cmd object
4305 * in case something prevents using it.
4308 * spin_lock_irqsave(host_set lock)
4310 void ata_qc_free(struct ata_queued_cmd
*qc
)
4312 struct ata_port
*ap
= qc
->ap
;
4315 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4319 if (likely(ata_tag_valid(tag
))) {
4320 qc
->tag
= ATA_TAG_POISON
;
4321 clear_bit(tag
, &ap
->qc_allocated
);
4325 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4327 struct ata_port
*ap
= qc
->ap
;
4329 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4330 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4332 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4335 /* command should be marked inactive atomically with qc completion */
4336 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4337 ap
->sactive
&= ~(1 << qc
->tag
);
4339 ap
->active_tag
= ATA_TAG_POISON
;
4341 /* atapi: mark qc as inactive to prevent the interrupt handler
4342 * from completing the command twice later, before the error handler
4343 * is called. (when rc != 0 and atapi request sense is needed)
4345 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4346 ap
->qc_active
&= ~(1 << qc
->tag
);
4348 /* call completion callback */
4349 qc
->complete_fn(qc
);
4353 * ata_qc_complete - Complete an active ATA command
4354 * @qc: Command to complete
4355 * @err_mask: ATA Status register contents
4357 * Indicate to the mid and upper layers that an ATA
4358 * command has completed, with either an ok or not-ok status.
4361 * spin_lock_irqsave(host_set lock)
4363 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4365 struct ata_port
*ap
= qc
->ap
;
4367 /* XXX: New EH and old EH use different mechanisms to
4368 * synchronize EH with regular execution path.
4370 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4371 * Normal execution path is responsible for not accessing a
4372 * failed qc. libata core enforces the rule by returning NULL
4373 * from ata_qc_from_tag() for failed qcs.
4375 * Old EH depends on ata_qc_complete() nullifying completion
4376 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4377 * not synchronize with interrupt handler. Only PIO task is
4380 if (ap
->ops
->error_handler
) {
4381 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4383 if (unlikely(qc
->err_mask
))
4384 qc
->flags
|= ATA_QCFLAG_FAILED
;
4386 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4387 if (!ata_tag_internal(qc
->tag
)) {
4388 /* always fill result TF for failed qc */
4389 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4390 ata_qc_schedule_eh(qc
);
4395 /* read result TF if requested */
4396 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4397 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4399 __ata_qc_complete(qc
);
4401 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4404 /* read result TF if failed or requested */
4405 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4406 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4408 __ata_qc_complete(qc
);
4413 * ata_qc_complete_multiple - Complete multiple qcs successfully
4414 * @ap: port in question
4415 * @qc_active: new qc_active mask
4416 * @finish_qc: LLDD callback invoked before completing a qc
4418 * Complete in-flight commands. This functions is meant to be
4419 * called from low-level driver's interrupt routine to complete
4420 * requests normally. ap->qc_active and @qc_active is compared
4421 * and commands are completed accordingly.
4424 * spin_lock_irqsave(host_set lock)
4427 * Number of completed commands on success, -errno otherwise.
4429 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4430 void (*finish_qc
)(struct ata_queued_cmd
*))
4436 done_mask
= ap
->qc_active
^ qc_active
;
4438 if (unlikely(done_mask
& qc_active
)) {
4439 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4440 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4444 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4445 struct ata_queued_cmd
*qc
;
4447 if (!(done_mask
& (1 << i
)))
4450 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4453 ata_qc_complete(qc
);
4461 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4463 struct ata_port
*ap
= qc
->ap
;
4465 switch (qc
->tf
.protocol
) {
4468 case ATA_PROT_ATAPI_DMA
:
4471 case ATA_PROT_ATAPI
:
4473 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4486 * ata_qc_issue - issue taskfile to device
4487 * @qc: command to issue to device
4489 * Prepare an ATA command to submission to device.
4490 * This includes mapping the data into a DMA-able
4491 * area, filling in the S/G table, and finally
4492 * writing the taskfile to hardware, starting the command.
4495 * spin_lock_irqsave(host_set lock)
4497 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4499 struct ata_port
*ap
= qc
->ap
;
4501 /* Make sure only one non-NCQ command is outstanding. The
4502 * check is skipped for old EH because it reuses active qc to
4503 * request ATAPI sense.
4505 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4507 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4508 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4509 ap
->sactive
|= 1 << qc
->tag
;
4511 WARN_ON(ap
->sactive
);
4512 ap
->active_tag
= qc
->tag
;
4515 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4516 ap
->qc_active
|= 1 << qc
->tag
;
4518 if (ata_should_dma_map(qc
)) {
4519 if (qc
->flags
& ATA_QCFLAG_SG
) {
4520 if (ata_sg_setup(qc
))
4522 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4523 if (ata_sg_setup_one(qc
))
4527 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4530 ap
->ops
->qc_prep(qc
);
4532 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4533 if (unlikely(qc
->err_mask
))
4538 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4539 qc
->err_mask
|= AC_ERR_SYSTEM
;
4541 ata_qc_complete(qc
);
4545 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4546 * @qc: command to issue to device
4548 * Using various libata functions and hooks, this function
4549 * starts an ATA command. ATA commands are grouped into
4550 * classes called "protocols", and issuing each type of protocol
4551 * is slightly different.
4553 * May be used as the qc_issue() entry in ata_port_operations.
4556 * spin_lock_irqsave(host_set lock)
4559 * Zero on success, AC_ERR_* mask on failure
4562 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4564 struct ata_port
*ap
= qc
->ap
;
4566 /* Use polling pio if the LLD doesn't handle
4567 * interrupt driven pio and atapi CDB interrupt.
4569 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4570 switch (qc
->tf
.protocol
) {
4572 case ATA_PROT_ATAPI
:
4573 case ATA_PROT_ATAPI_NODATA
:
4574 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4576 case ATA_PROT_ATAPI_DMA
:
4577 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4578 /* see ata_check_atapi_dma() */
4586 /* select the device */
4587 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4589 /* start the command */
4590 switch (qc
->tf
.protocol
) {
4591 case ATA_PROT_NODATA
:
4592 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4593 ata_qc_set_polling(qc
);
4595 ata_tf_to_host(ap
, &qc
->tf
);
4596 ap
->hsm_task_state
= HSM_ST_LAST
;
4598 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4599 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4604 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4606 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4607 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4608 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4609 ap
->hsm_task_state
= HSM_ST_LAST
;
4613 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4614 ata_qc_set_polling(qc
);
4616 ata_tf_to_host(ap
, &qc
->tf
);
4618 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4619 /* PIO data out protocol */
4620 ap
->hsm_task_state
= HSM_ST_FIRST
;
4621 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4623 /* always send first data block using
4624 * the ata_pio_task() codepath.
4627 /* PIO data in protocol */
4628 ap
->hsm_task_state
= HSM_ST
;
4630 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4631 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4633 /* if polling, ata_pio_task() handles the rest.
4634 * otherwise, interrupt handler takes over from here.
4640 case ATA_PROT_ATAPI
:
4641 case ATA_PROT_ATAPI_NODATA
:
4642 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4643 ata_qc_set_polling(qc
);
4645 ata_tf_to_host(ap
, &qc
->tf
);
4647 ap
->hsm_task_state
= HSM_ST_FIRST
;
4649 /* send cdb by polling if no cdb interrupt */
4650 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4651 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4652 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4655 case ATA_PROT_ATAPI_DMA
:
4656 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4658 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4659 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4660 ap
->hsm_task_state
= HSM_ST_FIRST
;
4662 /* send cdb by polling if no cdb interrupt */
4663 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4664 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4669 return AC_ERR_SYSTEM
;
4676 * ata_host_intr - Handle host interrupt for given (port, task)
4677 * @ap: Port on which interrupt arrived (possibly...)
4678 * @qc: Taskfile currently active in engine
4680 * Handle host interrupt for given queued command. Currently,
4681 * only DMA interrupts are handled. All other commands are
4682 * handled via polling with interrupts disabled (nIEN bit).
4685 * spin_lock_irqsave(host_set lock)
4688 * One if interrupt was handled, zero if not (shared irq).
4691 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4692 struct ata_queued_cmd
*qc
)
4694 u8 status
, host_stat
= 0;
4696 VPRINTK("ata%u: protocol %d task_state %d\n",
4697 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4699 /* Check whether we are expecting interrupt in this state */
4700 switch (ap
->hsm_task_state
) {
4702 /* Some pre-ATAPI-4 devices assert INTRQ
4703 * at this state when ready to receive CDB.
4706 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4707 * The flag was turned on only for atapi devices.
4708 * No need to check is_atapi_taskfile(&qc->tf) again.
4710 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4714 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4715 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4716 /* check status of DMA engine */
4717 host_stat
= ap
->ops
->bmdma_status(ap
);
4718 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4720 /* if it's not our irq... */
4721 if (!(host_stat
& ATA_DMA_INTR
))
4724 /* before we do anything else, clear DMA-Start bit */
4725 ap
->ops
->bmdma_stop(qc
);
4727 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4728 /* error when transfering data to/from memory */
4729 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4730 ap
->hsm_task_state
= HSM_ST_ERR
;
4740 /* check altstatus */
4741 status
= ata_altstatus(ap
);
4742 if (status
& ATA_BUSY
)
4745 /* check main status, clearing INTRQ */
4746 status
= ata_chk_status(ap
);
4747 if (unlikely(status
& ATA_BUSY
))
4750 /* ack bmdma irq events */
4751 ap
->ops
->irq_clear(ap
);
4753 ata_hsm_move(ap
, qc
, status
, 0);
4754 return 1; /* irq handled */
4757 ap
->stats
.idle_irq
++;
4760 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4761 ata_irq_ack(ap
, 0); /* debug trap */
4762 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4766 return 0; /* irq not handled */
4770 * ata_interrupt - Default ATA host interrupt handler
4771 * @irq: irq line (unused)
4772 * @dev_instance: pointer to our ata_host_set information structure
4775 * Default interrupt handler for PCI IDE devices. Calls
4776 * ata_host_intr() for each port that is not disabled.
4779 * Obtains host_set lock during operation.
4782 * IRQ_NONE or IRQ_HANDLED.
4785 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4787 struct ata_host_set
*host_set
= dev_instance
;
4789 unsigned int handled
= 0;
4790 unsigned long flags
;
4792 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4793 spin_lock_irqsave(&host_set
->lock
, flags
);
4795 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4796 struct ata_port
*ap
;
4798 ap
= host_set
->ports
[i
];
4800 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4801 struct ata_queued_cmd
*qc
;
4803 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4804 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4805 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4806 handled
|= ata_host_intr(ap
, qc
);
4810 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4812 return IRQ_RETVAL(handled
);
4816 * sata_scr_valid - test whether SCRs are accessible
4817 * @ap: ATA port to test SCR accessibility for
4819 * Test whether SCRs are accessible for @ap.
4825 * 1 if SCRs are accessible, 0 otherwise.
4827 int sata_scr_valid(struct ata_port
*ap
)
4829 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4833 * sata_scr_read - read SCR register of the specified port
4834 * @ap: ATA port to read SCR for
4836 * @val: Place to store read value
4838 * Read SCR register @reg of @ap into *@val. This function is
4839 * guaranteed to succeed if the cable type of the port is SATA
4840 * and the port implements ->scr_read.
4846 * 0 on success, negative errno on failure.
4848 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4850 if (sata_scr_valid(ap
)) {
4851 *val
= ap
->ops
->scr_read(ap
, reg
);
4858 * sata_scr_write - write SCR register of the specified port
4859 * @ap: ATA port to write SCR for
4860 * @reg: SCR to write
4861 * @val: value to write
4863 * Write @val to SCR register @reg of @ap. This function is
4864 * guaranteed to succeed if the cable type of the port is SATA
4865 * and the port implements ->scr_read.
4871 * 0 on success, negative errno on failure.
4873 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4875 if (sata_scr_valid(ap
)) {
4876 ap
->ops
->scr_write(ap
, reg
, val
);
4883 * sata_scr_write_flush - write SCR register of the specified port and flush
4884 * @ap: ATA port to write SCR for
4885 * @reg: SCR to write
4886 * @val: value to write
4888 * This function is identical to sata_scr_write() except that this
4889 * function performs flush after writing to the register.
4895 * 0 on success, negative errno on failure.
4897 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4899 if (sata_scr_valid(ap
)) {
4900 ap
->ops
->scr_write(ap
, reg
, val
);
4901 ap
->ops
->scr_read(ap
, reg
);
4908 * ata_port_online - test whether the given port is online
4909 * @ap: ATA port to test
4911 * Test whether @ap is online. Note that this function returns 0
4912 * if online status of @ap cannot be obtained, so
4913 * ata_port_online(ap) != !ata_port_offline(ap).
4919 * 1 if the port online status is available and online.
4921 int ata_port_online(struct ata_port
*ap
)
4925 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4931 * ata_port_offline - test whether the given port is offline
4932 * @ap: ATA port to test
4934 * Test whether @ap is offline. Note that this function returns
4935 * 0 if offline status of @ap cannot be obtained, so
4936 * ata_port_online(ap) != !ata_port_offline(ap).
4942 * 1 if the port offline status is available and offline.
4944 int ata_port_offline(struct ata_port
*ap
)
4948 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4954 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4955 * without filling any other registers
4957 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4959 struct ata_taskfile tf
;
4962 ata_tf_init(dev
, &tf
);
4965 tf
.flags
|= ATA_TFLAG_DEVICE
;
4966 tf
.protocol
= ATA_PROT_NODATA
;
4968 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4970 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4976 static int ata_flush_cache(struct ata_device
*dev
)
4980 if (!ata_try_flush_cache(dev
))
4983 if (ata_id_has_flush_ext(dev
->id
))
4984 cmd
= ATA_CMD_FLUSH_EXT
;
4986 cmd
= ATA_CMD_FLUSH
;
4988 return ata_do_simple_cmd(dev
, cmd
);
4991 static int ata_standby_drive(struct ata_device
*dev
)
4993 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4996 static int ata_start_drive(struct ata_device
*dev
)
4998 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
5002 * ata_device_resume - wakeup a previously suspended devices
5003 * @dev: the device to resume
5005 * Kick the drive back into action, by sending it an idle immediate
5006 * command and making sure its transfer mode matches between drive
5010 int ata_device_resume(struct ata_device
*dev
)
5012 struct ata_port
*ap
= dev
->ap
;
5014 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
5015 struct ata_device
*failed_dev
;
5017 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
5019 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
5020 while (ata_set_mode(ap
, &failed_dev
))
5021 ata_dev_disable(failed_dev
);
5023 if (!ata_dev_enabled(dev
))
5025 if (dev
->class == ATA_DEV_ATA
)
5026 ata_start_drive(dev
);
5032 * ata_device_suspend - prepare a device for suspend
5033 * @dev: the device to suspend
5034 * @state: target power management state
5036 * Flush the cache on the drive, if appropriate, then issue a
5037 * standbynow command.
5039 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5041 struct ata_port
*ap
= dev
->ap
;
5043 if (!ata_dev_enabled(dev
))
5045 if (dev
->class == ATA_DEV_ATA
)
5046 ata_flush_cache(dev
);
5048 if (state
.event
!= PM_EVENT_FREEZE
)
5049 ata_standby_drive(dev
);
5050 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5055 * ata_port_start - Set port up for dma.
5056 * @ap: Port to initialize
5058 * Called just after data structures for each port are
5059 * initialized. Allocates space for PRD table.
5061 * May be used as the port_start() entry in ata_port_operations.
5064 * Inherited from caller.
5067 int ata_port_start (struct ata_port
*ap
)
5069 struct device
*dev
= ap
->dev
;
5072 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5076 rc
= ata_pad_alloc(ap
, dev
);
5078 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5082 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5089 * ata_port_stop - Undo ata_port_start()
5090 * @ap: Port to shut down
5092 * Frees the PRD table.
5094 * May be used as the port_stop() entry in ata_port_operations.
5097 * Inherited from caller.
5100 void ata_port_stop (struct ata_port
*ap
)
5102 struct device
*dev
= ap
->dev
;
5104 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5105 ata_pad_free(ap
, dev
);
5108 void ata_host_stop (struct ata_host_set
*host_set
)
5110 if (host_set
->mmio_base
)
5111 iounmap(host_set
->mmio_base
);
5116 * ata_host_remove - Unregister SCSI host structure with upper layers
5117 * @ap: Port to unregister
5118 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5121 * Inherited from caller.
5124 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5126 struct Scsi_Host
*sh
= ap
->host
;
5131 scsi_remove_host(sh
);
5133 ap
->ops
->port_stop(ap
);
5137 * ata_dev_init - Initialize an ata_device structure
5138 * @dev: Device structure to initialize
5140 * Initialize @dev in preparation for probing.
5143 * Inherited from caller.
5145 void ata_dev_init(struct ata_device
*dev
)
5147 struct ata_port
*ap
= dev
->ap
;
5148 unsigned long flags
;
5150 /* SATA spd limit is bound to the first device */
5151 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5153 /* High bits of dev->flags are used to record warm plug
5154 * requests which occur asynchronously. Synchronize using
5157 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5158 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5159 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5161 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5162 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5163 dev
->pio_mask
= UINT_MAX
;
5164 dev
->mwdma_mask
= UINT_MAX
;
5165 dev
->udma_mask
= UINT_MAX
;
5169 * ata_host_init - Initialize an ata_port structure
5170 * @ap: Structure to initialize
5171 * @host: associated SCSI mid-layer structure
5172 * @host_set: Collection of hosts to which @ap belongs
5173 * @ent: Probe information provided by low-level driver
5174 * @port_no: Port number associated with this ata_port
5176 * Initialize a new ata_port structure, and its associated
5180 * Inherited from caller.
5182 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5183 struct ata_host_set
*host_set
,
5184 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5190 host
->max_channel
= 1;
5191 host
->unique_id
= ata_unique_id
++;
5192 host
->max_cmd_len
= 12;
5194 ap
->flags
= ATA_FLAG_DISABLED
;
5195 ap
->id
= host
->unique_id
;
5197 ap
->ctl
= ATA_DEVCTL_OBS
;
5198 ap
->host_set
= host_set
;
5200 ap
->port_no
= port_no
;
5202 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5203 ap
->pio_mask
= ent
->pio_mask
;
5204 ap
->mwdma_mask
= ent
->mwdma_mask
;
5205 ap
->udma_mask
= ent
->udma_mask
;
5206 ap
->flags
|= ent
->host_flags
;
5207 ap
->ops
= ent
->port_ops
;
5208 ap
->hw_sata_spd_limit
= UINT_MAX
;
5209 ap
->active_tag
= ATA_TAG_POISON
;
5210 ap
->last_ctl
= 0xFF;
5211 ap
->msg_enable
= ATA_MSG_DRV
;
5213 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5214 INIT_LIST_HEAD(&ap
->eh_done_q
);
5215 init_waitqueue_head(&ap
->eh_wait_q
);
5217 /* set cable type */
5218 ap
->cbl
= ATA_CBL_NONE
;
5219 if (ap
->flags
& ATA_FLAG_SATA
)
5220 ap
->cbl
= ATA_CBL_SATA
;
5222 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5223 struct ata_device
*dev
= &ap
->device
[i
];
5230 ap
->stats
.unhandled_irq
= 1;
5231 ap
->stats
.idle_irq
= 1;
5234 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5238 * ata_host_add - Attach low-level ATA driver to system
5239 * @ent: Information provided by low-level driver
5240 * @host_set: Collections of ports to which we add
5241 * @port_no: Port number associated with this host
5243 * Attach low-level ATA driver to system.
5246 * PCI/etc. bus probe sem.
5249 * New ata_port on success, for NULL on error.
5252 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5253 struct ata_host_set
*host_set
,
5254 unsigned int port_no
)
5256 struct Scsi_Host
*host
;
5257 struct ata_port
*ap
;
5262 if (!ent
->port_ops
->probe_reset
&&
5263 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5264 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5269 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5273 host
->transportt
= &ata_scsi_transport_template
;
5275 ap
= ata_shost_to_port(host
);
5277 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5279 rc
= ap
->ops
->port_start(ap
);
5286 scsi_host_put(host
);
5291 * ata_device_add - Register hardware device with ATA and SCSI layers
5292 * @ent: Probe information describing hardware device to be registered
5294 * This function processes the information provided in the probe
5295 * information struct @ent, allocates the necessary ATA and SCSI
5296 * host information structures, initializes them, and registers
5297 * everything with requisite kernel subsystems.
5299 * This function requests irqs, probes the ATA bus, and probes
5303 * PCI/etc. bus probe sem.
5306 * Number of ports registered. Zero on error (no ports registered).
5309 int ata_device_add(const struct ata_probe_ent
*ent
)
5311 unsigned int count
= 0, i
;
5312 struct device
*dev
= ent
->dev
;
5313 struct ata_host_set
*host_set
;
5316 /* alloc a container for our list of ATA ports (buses) */
5317 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5318 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5321 spin_lock_init(&host_set
->lock
);
5323 host_set
->dev
= dev
;
5324 host_set
->n_ports
= ent
->n_ports
;
5325 host_set
->irq
= ent
->irq
;
5326 host_set
->mmio_base
= ent
->mmio_base
;
5327 host_set
->private_data
= ent
->private_data
;
5328 host_set
->ops
= ent
->port_ops
;
5329 host_set
->flags
= ent
->host_set_flags
;
5331 /* register each port bound to this device */
5332 for (i
= 0; i
< ent
->n_ports
; i
++) {
5333 struct ata_port
*ap
;
5334 unsigned long xfer_mode_mask
;
5336 ap
= ata_host_add(ent
, host_set
, i
);
5340 host_set
->ports
[i
] = ap
;
5341 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5342 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5343 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5345 /* print per-port info to dmesg */
5346 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5347 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5348 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5349 ata_mode_string(xfer_mode_mask
),
5350 ap
->ioaddr
.cmd_addr
,
5351 ap
->ioaddr
.ctl_addr
,
5352 ap
->ioaddr
.bmdma_addr
,
5356 host_set
->ops
->irq_clear(ap
);
5357 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5364 /* obtain irq, that is shared between channels */
5365 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5366 DRV_NAME
, host_set
))
5369 /* perform each probe synchronously */
5370 DPRINTK("probe begin\n");
5371 for (i
= 0; i
< count
; i
++) {
5372 struct ata_port
*ap
;
5376 ap
= host_set
->ports
[i
];
5378 /* init sata_spd_limit to the current value */
5379 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5380 int spd
= (scontrol
>> 4) & 0xf;
5381 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5383 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5385 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5386 rc
= ata_bus_probe(ap
);
5387 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5390 /* FIXME: do something useful here?
5391 * Current libata behavior will
5392 * tear down everything when
5393 * the module is removed
5394 * or the h/w is unplugged.
5398 rc
= scsi_add_host(ap
->host
, dev
);
5400 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5401 /* FIXME: do something useful here */
5402 /* FIXME: handle unconditional calls to
5403 * scsi_scan_host and ata_host_remove, below,
5409 /* probes are done, now scan each port's disk(s) */
5410 DPRINTK("host probe begin\n");
5411 for (i
= 0; i
< count
; i
++) {
5412 struct ata_port
*ap
= host_set
->ports
[i
];
5414 ata_scsi_scan_host(ap
);
5417 dev_set_drvdata(dev
, host_set
);
5419 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5420 return ent
->n_ports
; /* success */
5423 for (i
= 0; i
< count
; i
++) {
5424 ata_host_remove(host_set
->ports
[i
], 1);
5425 scsi_host_put(host_set
->ports
[i
]->host
);
5429 VPRINTK("EXIT, returning 0\n");
5434 * ata_host_set_remove - PCI layer callback for device removal
5435 * @host_set: ATA host set that was removed
5437 * Unregister all objects associated with this host set. Free those
5441 * Inherited from calling layer (may sleep).
5444 void ata_host_set_remove(struct ata_host_set
*host_set
)
5446 struct ata_port
*ap
;
5449 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5450 ap
= host_set
->ports
[i
];
5451 scsi_remove_host(ap
->host
);
5454 free_irq(host_set
->irq
, host_set
);
5456 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5457 ap
= host_set
->ports
[i
];
5459 ata_scsi_release(ap
->host
);
5461 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5462 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5464 if (ioaddr
->cmd_addr
== 0x1f0)
5465 release_region(0x1f0, 8);
5466 else if (ioaddr
->cmd_addr
== 0x170)
5467 release_region(0x170, 8);
5470 scsi_host_put(ap
->host
);
5473 if (host_set
->ops
->host_stop
)
5474 host_set
->ops
->host_stop(host_set
);
5480 * ata_scsi_release - SCSI layer callback hook for host unload
5481 * @host: libata host to be unloaded
5483 * Performs all duties necessary to shut down a libata port...
5484 * Kill port kthread, disable port, and release resources.
5487 * Inherited from SCSI layer.
5493 int ata_scsi_release(struct Scsi_Host
*host
)
5495 struct ata_port
*ap
= ata_shost_to_port(host
);
5499 ap
->ops
->port_disable(ap
);
5500 ata_host_remove(ap
, 0);
5507 * ata_std_ports - initialize ioaddr with standard port offsets.
5508 * @ioaddr: IO address structure to be initialized
5510 * Utility function which initializes data_addr, error_addr,
5511 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5512 * device_addr, status_addr, and command_addr to standard offsets
5513 * relative to cmd_addr.
5515 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5518 void ata_std_ports(struct ata_ioports
*ioaddr
)
5520 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5521 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5522 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5523 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5524 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5525 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5526 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5527 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5528 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5529 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5535 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5537 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5539 pci_iounmap(pdev
, host_set
->mmio_base
);
5543 * ata_pci_remove_one - PCI layer callback for device removal
5544 * @pdev: PCI device that was removed
5546 * PCI layer indicates to libata via this hook that
5547 * hot-unplug or module unload event has occurred.
5548 * Handle this by unregistering all objects associated
5549 * with this PCI device. Free those objects. Then finally
5550 * release PCI resources and disable device.
5553 * Inherited from PCI layer (may sleep).
5556 void ata_pci_remove_one (struct pci_dev
*pdev
)
5558 struct device
*dev
= pci_dev_to_dev(pdev
);
5559 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5561 ata_host_set_remove(host_set
);
5562 pci_release_regions(pdev
);
5563 pci_disable_device(pdev
);
5564 dev_set_drvdata(dev
, NULL
);
5567 /* move to PCI subsystem */
5568 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5570 unsigned long tmp
= 0;
5572 switch (bits
->width
) {
5575 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5581 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5587 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5598 return (tmp
== bits
->val
) ? 1 : 0;
5601 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5603 pci_save_state(pdev
);
5604 pci_disable_device(pdev
);
5605 pci_set_power_state(pdev
, PCI_D3hot
);
5609 int ata_pci_device_resume(struct pci_dev
*pdev
)
5611 pci_set_power_state(pdev
, PCI_D0
);
5612 pci_restore_state(pdev
);
5613 pci_enable_device(pdev
);
5614 pci_set_master(pdev
);
5617 #endif /* CONFIG_PCI */
5620 static int __init
ata_init(void)
5622 ata_wq
= create_workqueue("ata");
5626 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5630 static void __exit
ata_exit(void)
5632 destroy_workqueue(ata_wq
);
5635 module_init(ata_init
);
5636 module_exit(ata_exit
);
5638 static unsigned long ratelimit_time
;
5639 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5641 int ata_ratelimit(void)
5644 unsigned long flags
;
5646 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5648 if (time_after(jiffies
, ratelimit_time
)) {
5650 ratelimit_time
= jiffies
+ (HZ
/5);
5654 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5660 * ata_wait_register - wait until register value changes
5661 * @reg: IO-mapped register
5662 * @mask: Mask to apply to read register value
5663 * @val: Wait condition
5664 * @interval_msec: polling interval in milliseconds
5665 * @timeout_msec: timeout in milliseconds
5667 * Waiting for some bits of register to change is a common
5668 * operation for ATA controllers. This function reads 32bit LE
5669 * IO-mapped register @reg and tests for the following condition.
5671 * (*@reg & mask) != val
5673 * If the condition is met, it returns; otherwise, the process is
5674 * repeated after @interval_msec until timeout.
5677 * Kernel thread context (may sleep)
5680 * The final register value.
5682 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5683 unsigned long interval_msec
,
5684 unsigned long timeout_msec
)
5686 unsigned long timeout
;
5689 tmp
= ioread32(reg
);
5691 /* Calculate timeout _after_ the first read to make sure
5692 * preceding writes reach the controller before starting to
5693 * eat away the timeout.
5695 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5697 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5698 msleep(interval_msec
);
5699 tmp
= ioread32(reg
);
5706 * libata is essentially a library of internal helper functions for
5707 * low-level ATA host controller drivers. As such, the API/ABI is
5708 * likely to change as new drivers are added and updated.
5709 * Do not depend on ABI/API stability.
5712 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5713 EXPORT_SYMBOL_GPL(ata_std_ports
);
5714 EXPORT_SYMBOL_GPL(ata_device_add
);
5715 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5716 EXPORT_SYMBOL_GPL(ata_sg_init
);
5717 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5718 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5719 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5720 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5721 EXPORT_SYMBOL_GPL(ata_tf_load
);
5722 EXPORT_SYMBOL_GPL(ata_tf_read
);
5723 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5724 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5725 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5726 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5727 EXPORT_SYMBOL_GPL(ata_check_status
);
5728 EXPORT_SYMBOL_GPL(ata_altstatus
);
5729 EXPORT_SYMBOL_GPL(ata_exec_command
);
5730 EXPORT_SYMBOL_GPL(ata_port_start
);
5731 EXPORT_SYMBOL_GPL(ata_port_stop
);
5732 EXPORT_SYMBOL_GPL(ata_host_stop
);
5733 EXPORT_SYMBOL_GPL(ata_interrupt
);
5734 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5735 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5736 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5737 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5738 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5739 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5740 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5741 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5742 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5743 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5744 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5745 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5746 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5747 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5748 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5749 EXPORT_SYMBOL_GPL(ata_port_probe
);
5750 EXPORT_SYMBOL_GPL(sata_set_spd
);
5751 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5752 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5753 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5754 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5755 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5756 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5757 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5758 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5759 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5760 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5761 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5762 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5763 EXPORT_SYMBOL_GPL(ata_port_disable
);
5764 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5765 EXPORT_SYMBOL_GPL(ata_wait_register
);
5766 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5767 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5768 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5769 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5770 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5771 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5772 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5773 EXPORT_SYMBOL_GPL(ata_host_intr
);
5774 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5775 EXPORT_SYMBOL_GPL(sata_scr_read
);
5776 EXPORT_SYMBOL_GPL(sata_scr_write
);
5777 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5778 EXPORT_SYMBOL_GPL(ata_port_online
);
5779 EXPORT_SYMBOL_GPL(ata_port_offline
);
5780 EXPORT_SYMBOL_GPL(ata_id_string
);
5781 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5782 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5784 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5785 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5786 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5789 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5790 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5791 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5792 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5793 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5794 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5795 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5796 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5797 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5798 #endif /* CONFIG_PCI */
5800 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5801 EXPORT_SYMBOL_GPL(ata_device_resume
);
5802 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5803 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5805 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5806 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5807 EXPORT_SYMBOL_GPL(ata_port_abort
);
5808 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5809 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5810 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5811 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5812 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5813 EXPORT_SYMBOL_GPL(ata_do_eh
);