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
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
896 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
899 PREPARE_WORK(&ap
->port_task
, fn
, data
);
902 rc
= queue_work(ata_wq
, &ap
->port_task
);
904 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port
*ap
)
926 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
927 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
928 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq
);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap
->port_task
)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq
);
943 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
944 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
945 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
950 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
952 struct completion
*waiting
= qc
->private_data
;
958 * ata_exec_internal - execute libata internal command
959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
961 * @cdb: CDB for packet command
962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
973 * None. Should be called with kernel context, might sleep.
976 unsigned ata_exec_internal(struct ata_device
*dev
,
977 struct ata_taskfile
*tf
, const u8
*cdb
,
978 int dma_dir
, void *buf
, unsigned int buflen
)
980 struct ata_port
*ap
= dev
->ap
;
981 u8 command
= tf
->command
;
982 struct ata_queued_cmd
*qc
;
983 unsigned int tag
, preempted_tag
;
984 DECLARE_COMPLETION(wait
);
986 unsigned int err_mask
;
988 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
990 /* initialize internal qc */
992 /* XXX: Tag 0 is used for drivers with legacy EH as some
993 * drivers choke if any other tag is given. This breaks
994 * ata_tag_internal() test for those drivers. Don't use new
995 * EH stuff without converting to it.
997 if (ap
->ops
->error_handler
)
998 tag
= ATA_TAG_INTERNAL
;
1002 if (test_and_set_bit(tag
, &ap
->qactive
))
1004 qc
= __ata_qc_from_tag(ap
, tag
);
1012 preempted_tag
= ap
->active_tag
;
1013 ap
->active_tag
= ATA_TAG_POISON
;
1015 /* prepare & issue qc */
1018 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1019 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1020 qc
->dma_dir
= dma_dir
;
1021 if (dma_dir
!= DMA_NONE
) {
1022 ata_sg_init_one(qc
, buf
, buflen
);
1023 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1026 qc
->private_data
= &wait
;
1027 qc
->complete_fn
= ata_qc_complete_internal
;
1031 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1033 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1034 ata_port_flush_task(ap
);
1036 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1038 /* We're racing with irq here. If we lose, the
1039 * following test prevents us from completing the qc
1040 * again. If completion irq occurs after here but
1041 * before the caller cleans up, it will result in a
1042 * spurious interrupt. We can live with that.
1044 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1045 qc
->err_mask
= AC_ERR_TIMEOUT
;
1046 ata_qc_complete(qc
);
1048 ata_dev_printk(dev
, KERN_WARNING
,
1049 "qc timeout (cmd 0x%x)\n", command
);
1052 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1056 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1058 *tf
= qc
->result_tf
;
1059 err_mask
= qc
->err_mask
;
1062 ap
->active_tag
= preempted_tag
;
1064 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1065 * Until those drivers are fixed, we detect the condition
1066 * here, fail the command with AC_ERR_SYSTEM and reenable the
1069 * Note that this doesn't change any behavior as internal
1070 * command failure results in disabling the device in the
1071 * higher layer for LLDDs without new reset/EH callbacks.
1073 * Kill the following code as soon as those drivers are fixed.
1075 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1076 err_mask
|= AC_ERR_SYSTEM
;
1080 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1086 * ata_pio_need_iordy - check if iordy needed
1089 * Check if the current speed of the device requires IORDY. Used
1090 * by various controllers for chip configuration.
1093 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1096 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1103 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1105 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1106 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1107 /* Is the speed faster than the drive allows non IORDY ? */
1109 /* This is cycle times not frequency - watch the logic! */
1110 if (pio
> 240) /* PIO2 is 240nS per cycle */
1119 * ata_dev_read_id - Read ID data from the specified device
1120 * @dev: target device
1121 * @p_class: pointer to class of the target device (may be changed)
1122 * @post_reset: is this read ID post-reset?
1123 * @id: buffer to read IDENTIFY data into
1125 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1126 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1127 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1128 * for pre-ATA4 drives.
1131 * Kernel thread context (may sleep)
1134 * 0 on success, -errno otherwise.
1136 static int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1137 int post_reset
, u16
*id
)
1139 struct ata_port
*ap
= dev
->ap
;
1140 unsigned int class = *p_class
;
1141 struct ata_taskfile tf
;
1142 unsigned int err_mask
= 0;
1146 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1148 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1151 ata_tf_init(dev
, &tf
);
1155 tf
.command
= ATA_CMD_ID_ATA
;
1158 tf
.command
= ATA_CMD_ID_ATAPI
;
1162 reason
= "unsupported class";
1166 tf
.protocol
= ATA_PROT_PIO
;
1168 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1169 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1172 reason
= "I/O error";
1176 swap_buf_le16(id
, ATA_ID_WORDS
);
1179 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1181 reason
= "device reports illegal type";
1185 if (post_reset
&& class == ATA_DEV_ATA
) {
1187 * The exact sequence expected by certain pre-ATA4 drives is:
1190 * INITIALIZE DEVICE PARAMETERS
1192 * Some drives were very specific about that exact sequence.
1194 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1195 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1198 reason
= "INIT_DEV_PARAMS failed";
1202 /* current CHS translation info (id[53-58]) might be
1203 * changed. reread the identify device info.
1215 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1216 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1220 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1222 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1226 * ata_dev_configure - Configure the specified ATA/ATAPI device
1227 * @dev: Target device to configure
1228 * @print_info: Enable device info printout
1230 * Configure @dev according to @dev->id. Generic and low-level
1231 * driver specific fixups are also applied.
1234 * Kernel thread context (may sleep)
1237 * 0 on success, -errno otherwise
1239 static int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1241 struct ata_port
*ap
= dev
->ap
;
1242 const u16
*id
= dev
->id
;
1243 unsigned int xfer_mask
;
1246 if (!ata_dev_enabled(dev
)) {
1247 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1248 ap
->id
, dev
->devno
);
1252 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1254 /* print device capabilities */
1256 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1257 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1258 id
[49], id
[82], id
[83], id
[84],
1259 id
[85], id
[86], id
[87], id
[88]);
1261 /* initialize to-be-configured parameters */
1262 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1263 dev
->max_sectors
= 0;
1271 * common ATA, ATAPI feature tests
1274 /* find max transfer mode; for printk only */
1275 xfer_mask
= ata_id_xfermask(id
);
1279 /* ATA-specific feature tests */
1280 if (dev
->class == ATA_DEV_ATA
) {
1281 dev
->n_sectors
= ata_id_n_sectors(id
);
1283 if (ata_id_has_lba(id
)) {
1284 const char *lba_desc
;
1287 dev
->flags
|= ATA_DFLAG_LBA
;
1288 if (ata_id_has_lba48(id
)) {
1289 dev
->flags
|= ATA_DFLAG_LBA48
;
1293 /* print device info to dmesg */
1295 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1296 "max %s, %Lu sectors: %s\n",
1297 ata_id_major_version(id
),
1298 ata_mode_string(xfer_mask
),
1299 (unsigned long long)dev
->n_sectors
,
1304 /* Default translation */
1305 dev
->cylinders
= id
[1];
1307 dev
->sectors
= id
[6];
1309 if (ata_id_current_chs_valid(id
)) {
1310 /* Current CHS translation is valid. */
1311 dev
->cylinders
= id
[54];
1312 dev
->heads
= id
[55];
1313 dev
->sectors
= id
[56];
1316 /* print device info to dmesg */
1318 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1319 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1320 ata_id_major_version(id
),
1321 ata_mode_string(xfer_mask
),
1322 (unsigned long long)dev
->n_sectors
,
1323 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1329 /* ATAPI-specific feature tests */
1330 else if (dev
->class == ATA_DEV_ATAPI
) {
1331 rc
= atapi_cdb_len(id
);
1332 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1333 ata_dev_printk(dev
, KERN_WARNING
,
1334 "unsupported CDB len\n");
1338 dev
->cdb_len
= (unsigned int) rc
;
1340 /* print device info to dmesg */
1342 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s\n",
1343 ata_mode_string(xfer_mask
));
1346 ap
->host
->max_cmd_len
= 0;
1347 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1348 ap
->host
->max_cmd_len
= max_t(unsigned int,
1349 ap
->host
->max_cmd_len
,
1350 ap
->device
[i
].cdb_len
);
1352 /* limit bridge transfers to udma5, 200 sectors */
1353 if (ata_dev_knobble(dev
)) {
1355 ata_dev_printk(dev
, KERN_INFO
,
1356 "applying bridge limits\n");
1357 dev
->udma_mask
&= ATA_UDMA5
;
1358 dev
->max_sectors
= ATA_MAX_SECTORS
;
1361 if (ap
->ops
->dev_config
)
1362 ap
->ops
->dev_config(ap
, dev
);
1364 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1368 DPRINTK("EXIT, err\n");
1373 * ata_bus_probe - Reset and probe ATA bus
1376 * Master ATA bus probing function. Initiates a hardware-dependent
1377 * bus reset, then attempts to identify any devices found on
1381 * PCI/etc. bus probe sem.
1384 * Zero on success, negative errno otherwise.
1387 static int ata_bus_probe(struct ata_port
*ap
)
1389 unsigned int classes
[ATA_MAX_DEVICES
];
1390 int tries
[ATA_MAX_DEVICES
];
1391 int i
, rc
, down_xfermask
;
1392 struct ata_device
*dev
;
1396 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1397 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1402 /* reset and determine device classes */
1403 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1404 classes
[i
] = ATA_DEV_UNKNOWN
;
1406 if (ap
->ops
->probe_reset
) {
1407 rc
= ap
->ops
->probe_reset(ap
, classes
);
1409 ata_port_printk(ap
, KERN_ERR
,
1410 "reset failed (errno=%d)\n", rc
);
1414 ap
->ops
->phy_reset(ap
);
1416 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1417 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1418 classes
[i
] = ap
->device
[i
].class;
1419 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1425 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1426 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1427 classes
[i
] = ATA_DEV_NONE
;
1429 /* read IDENTIFY page and configure devices */
1430 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1431 dev
= &ap
->device
[i
];
1434 dev
->class = classes
[i
];
1436 if (!ata_dev_enabled(dev
))
1439 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1443 rc
= ata_dev_configure(dev
, 1);
1448 /* configure transfer mode */
1449 rc
= ata_set_mode(ap
, &dev
);
1455 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1456 if (ata_dev_enabled(&ap
->device
[i
]))
1459 /* no device present, disable port */
1460 ata_port_disable(ap
);
1461 ap
->ops
->port_disable(ap
);
1468 tries
[dev
->devno
] = 0;
1471 sata_down_spd_limit(ap
);
1474 tries
[dev
->devno
]--;
1475 if (down_xfermask
&&
1476 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1477 tries
[dev
->devno
] = 0;
1480 if (!tries
[dev
->devno
]) {
1481 ata_down_xfermask_limit(dev
, 1);
1482 ata_dev_disable(dev
);
1489 * ata_port_probe - Mark port as enabled
1490 * @ap: Port for which we indicate enablement
1492 * Modify @ap data structure such that the system
1493 * thinks that the entire port is enabled.
1495 * LOCKING: host_set lock, or some other form of
1499 void ata_port_probe(struct ata_port
*ap
)
1501 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1505 * sata_print_link_status - Print SATA link status
1506 * @ap: SATA port to printk link status about
1508 * This function prints link speed and status of a SATA link.
1513 static void sata_print_link_status(struct ata_port
*ap
)
1515 u32 sstatus
, scontrol
, tmp
;
1517 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1519 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1521 if (ata_port_online(ap
)) {
1522 tmp
= (sstatus
>> 4) & 0xf;
1523 ata_port_printk(ap
, KERN_INFO
,
1524 "SATA link up %s (SStatus %X SControl %X)\n",
1525 sata_spd_string(tmp
), sstatus
, scontrol
);
1527 ata_port_printk(ap
, KERN_INFO
,
1528 "SATA link down (SStatus %X SControl %X)\n",
1534 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1535 * @ap: SATA port associated with target SATA PHY.
1537 * This function issues commands to standard SATA Sxxx
1538 * PHY registers, to wake up the phy (and device), and
1539 * clear any reset condition.
1542 * PCI/etc. bus probe sem.
1545 void __sata_phy_reset(struct ata_port
*ap
)
1548 unsigned long timeout
= jiffies
+ (HZ
* 5);
1550 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1551 /* issue phy wake/reset */
1552 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1553 /* Couldn't find anything in SATA I/II specs, but
1554 * AHCI-1.1 10.4.2 says at least 1 ms. */
1557 /* phy wake/clear reset */
1558 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1560 /* wait for phy to become ready, if necessary */
1563 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1564 if ((sstatus
& 0xf) != 1)
1566 } while (time_before(jiffies
, timeout
));
1568 /* print link status */
1569 sata_print_link_status(ap
);
1571 /* TODO: phy layer with polling, timeouts, etc. */
1572 if (!ata_port_offline(ap
))
1575 ata_port_disable(ap
);
1577 if (ap
->flags
& ATA_FLAG_DISABLED
)
1580 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1581 ata_port_disable(ap
);
1585 ap
->cbl
= ATA_CBL_SATA
;
1589 * sata_phy_reset - Reset SATA bus.
1590 * @ap: SATA port associated with target SATA PHY.
1592 * This function resets the SATA bus, and then probes
1593 * the bus for devices.
1596 * PCI/etc. bus probe sem.
1599 void sata_phy_reset(struct ata_port
*ap
)
1601 __sata_phy_reset(ap
);
1602 if (ap
->flags
& ATA_FLAG_DISABLED
)
1608 * ata_dev_pair - return other device on cable
1611 * Obtain the other device on the same cable, or if none is
1612 * present NULL is returned
1615 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1617 struct ata_port
*ap
= adev
->ap
;
1618 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1619 if (!ata_dev_enabled(pair
))
1625 * ata_port_disable - Disable port.
1626 * @ap: Port to be disabled.
1628 * Modify @ap data structure such that the system
1629 * thinks that the entire port is disabled, and should
1630 * never attempt to probe or communicate with devices
1633 * LOCKING: host_set lock, or some other form of
1637 void ata_port_disable(struct ata_port
*ap
)
1639 ap
->device
[0].class = ATA_DEV_NONE
;
1640 ap
->device
[1].class = ATA_DEV_NONE
;
1641 ap
->flags
|= ATA_FLAG_DISABLED
;
1645 * sata_down_spd_limit - adjust SATA spd limit downward
1646 * @ap: Port to adjust SATA spd limit for
1648 * Adjust SATA spd limit of @ap downward. Note that this
1649 * function only adjusts the limit. The change must be applied
1650 * using sata_set_spd().
1653 * Inherited from caller.
1656 * 0 on success, negative errno on failure
1658 int sata_down_spd_limit(struct ata_port
*ap
)
1660 u32 sstatus
, spd
, mask
;
1663 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1667 mask
= ap
->sata_spd_limit
;
1670 highbit
= fls(mask
) - 1;
1671 mask
&= ~(1 << highbit
);
1673 spd
= (sstatus
>> 4) & 0xf;
1677 mask
&= (1 << spd
) - 1;
1681 ap
->sata_spd_limit
= mask
;
1683 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1684 sata_spd_string(fls(mask
)));
1689 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1693 if (ap
->sata_spd_limit
== UINT_MAX
)
1696 limit
= fls(ap
->sata_spd_limit
);
1698 spd
= (*scontrol
>> 4) & 0xf;
1699 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1701 return spd
!= limit
;
1705 * sata_set_spd_needed - is SATA spd configuration needed
1706 * @ap: Port in question
1708 * Test whether the spd limit in SControl matches
1709 * @ap->sata_spd_limit. This function is used to determine
1710 * whether hardreset is necessary to apply SATA spd
1714 * Inherited from caller.
1717 * 1 if SATA spd configuration is needed, 0 otherwise.
1719 int sata_set_spd_needed(struct ata_port
*ap
)
1723 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1726 return __sata_set_spd_needed(ap
, &scontrol
);
1730 * sata_set_spd - set SATA spd according to spd limit
1731 * @ap: Port to set SATA spd for
1733 * Set SATA spd of @ap according to sata_spd_limit.
1736 * Inherited from caller.
1739 * 0 if spd doesn't need to be changed, 1 if spd has been
1740 * changed. Negative errno if SCR registers are inaccessible.
1742 int sata_set_spd(struct ata_port
*ap
)
1747 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1750 if (!__sata_set_spd_needed(ap
, &scontrol
))
1753 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1760 * This mode timing computation functionality is ported over from
1761 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1764 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1765 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1766 * for PIO 5, which is a nonstandard extension and UDMA6, which
1767 * is currently supported only by Maxtor drives.
1770 static const struct ata_timing ata_timing
[] = {
1772 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1773 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1774 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1775 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1777 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1778 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1779 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1781 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1783 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1784 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1785 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1787 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1788 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1789 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1791 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1792 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1793 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1795 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1796 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1797 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1799 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1804 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1805 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1807 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1809 q
->setup
= EZ(t
->setup
* 1000, T
);
1810 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1811 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1812 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1813 q
->active
= EZ(t
->active
* 1000, T
);
1814 q
->recover
= EZ(t
->recover
* 1000, T
);
1815 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1816 q
->udma
= EZ(t
->udma
* 1000, UT
);
1819 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1820 struct ata_timing
*m
, unsigned int what
)
1822 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1823 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1824 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1825 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1826 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1827 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1828 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1829 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1832 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1834 const struct ata_timing
*t
;
1836 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1837 if (t
->mode
== 0xFF)
1842 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1843 struct ata_timing
*t
, int T
, int UT
)
1845 const struct ata_timing
*s
;
1846 struct ata_timing p
;
1852 if (!(s
= ata_timing_find_mode(speed
)))
1855 memcpy(t
, s
, sizeof(*s
));
1858 * If the drive is an EIDE drive, it can tell us it needs extended
1859 * PIO/MW_DMA cycle timing.
1862 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1863 memset(&p
, 0, sizeof(p
));
1864 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1865 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1866 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1867 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1868 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1870 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1874 * Convert the timing to bus clock counts.
1877 ata_timing_quantize(t
, t
, T
, UT
);
1880 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1881 * S.M.A.R.T * and some other commands. We have to ensure that the
1882 * DMA cycle timing is slower/equal than the fastest PIO timing.
1885 if (speed
> XFER_PIO_4
) {
1886 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1887 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1891 * Lengthen active & recovery time so that cycle time is correct.
1894 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1895 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1896 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1899 if (t
->active
+ t
->recover
< t
->cycle
) {
1900 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1901 t
->recover
= t
->cycle
- t
->active
;
1908 * ata_down_xfermask_limit - adjust dev xfer masks downward
1909 * @dev: Device to adjust xfer masks
1910 * @force_pio0: Force PIO0
1912 * Adjust xfer masks of @dev downward. Note that this function
1913 * does not apply the change. Invoking ata_set_mode() afterwards
1914 * will apply the limit.
1917 * Inherited from caller.
1920 * 0 on success, negative errno on failure
1922 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
1924 unsigned long xfer_mask
;
1927 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1932 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1933 if (xfer_mask
& ATA_MASK_UDMA
)
1934 xfer_mask
&= ~ATA_MASK_MWDMA
;
1936 highbit
= fls(xfer_mask
) - 1;
1937 xfer_mask
&= ~(1 << highbit
);
1939 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1943 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1946 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
1947 ata_mode_string(xfer_mask
));
1955 static int ata_dev_set_mode(struct ata_device
*dev
)
1957 unsigned int err_mask
;
1960 dev
->flags
&= ~ATA_DFLAG_PIO
;
1961 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1962 dev
->flags
|= ATA_DFLAG_PIO
;
1964 err_mask
= ata_dev_set_xfermode(dev
);
1966 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
1967 "(err_mask=0x%x)\n", err_mask
);
1971 rc
= ata_dev_revalidate(dev
, 0);
1975 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1976 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1978 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
1979 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1984 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1985 * @ap: port on which timings will be programmed
1986 * @r_failed_dev: out paramter for failed device
1988 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1989 * ata_set_mode() fails, pointer to the failing device is
1990 * returned in @r_failed_dev.
1993 * PCI/etc. bus probe sem.
1996 * 0 on success, negative errno otherwise
1998 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2000 struct ata_device
*dev
;
2001 int i
, rc
= 0, used_dma
= 0, found
= 0;
2003 /* has private set_mode? */
2004 if (ap
->ops
->set_mode
) {
2005 /* FIXME: make ->set_mode handle no device case and
2006 * return error code and failing device on failure.
2008 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2009 if (ata_dev_enabled(&ap
->device
[i
])) {
2010 ap
->ops
->set_mode(ap
);
2017 /* step 1: calculate xfer_mask */
2018 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2019 unsigned int pio_mask
, dma_mask
;
2021 dev
= &ap
->device
[i
];
2023 if (!ata_dev_enabled(dev
))
2026 ata_dev_xfermask(dev
);
2028 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2029 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2030 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2031 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2040 /* step 2: always set host PIO timings */
2041 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2042 dev
= &ap
->device
[i
];
2043 if (!ata_dev_enabled(dev
))
2046 if (!dev
->pio_mode
) {
2047 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2052 dev
->xfer_mode
= dev
->pio_mode
;
2053 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2054 if (ap
->ops
->set_piomode
)
2055 ap
->ops
->set_piomode(ap
, dev
);
2058 /* step 3: set host DMA timings */
2059 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2060 dev
= &ap
->device
[i
];
2062 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2065 dev
->xfer_mode
= dev
->dma_mode
;
2066 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2067 if (ap
->ops
->set_dmamode
)
2068 ap
->ops
->set_dmamode(ap
, dev
);
2071 /* step 4: update devices' xfer mode */
2072 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2073 dev
= &ap
->device
[i
];
2075 if (!ata_dev_enabled(dev
))
2078 rc
= ata_dev_set_mode(dev
);
2083 /* Record simplex status. If we selected DMA then the other
2084 * host channels are not permitted to do so.
2086 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2087 ap
->host_set
->simplex_claimed
= 1;
2089 /* step5: chip specific finalisation */
2090 if (ap
->ops
->post_set_mode
)
2091 ap
->ops
->post_set_mode(ap
);
2095 *r_failed_dev
= dev
;
2100 * ata_tf_to_host - issue ATA taskfile to host controller
2101 * @ap: port to which command is being issued
2102 * @tf: ATA taskfile register set
2104 * Issues ATA taskfile register set to ATA host controller,
2105 * with proper synchronization with interrupt handler and
2109 * spin_lock_irqsave(host_set lock)
2112 static inline void ata_tf_to_host(struct ata_port
*ap
,
2113 const struct ata_taskfile
*tf
)
2115 ap
->ops
->tf_load(ap
, tf
);
2116 ap
->ops
->exec_command(ap
, tf
);
2120 * ata_busy_sleep - sleep until BSY clears, or timeout
2121 * @ap: port containing status register to be polled
2122 * @tmout_pat: impatience timeout
2123 * @tmout: overall timeout
2125 * Sleep until ATA Status register bit BSY clears,
2126 * or a timeout occurs.
2131 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2132 unsigned long tmout_pat
, unsigned long tmout
)
2134 unsigned long timer_start
, timeout
;
2137 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2138 timer_start
= jiffies
;
2139 timeout
= timer_start
+ tmout_pat
;
2140 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2142 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2145 if (status
& ATA_BUSY
)
2146 ata_port_printk(ap
, KERN_WARNING
,
2147 "port is slow to respond, please be patient\n");
2149 timeout
= timer_start
+ tmout
;
2150 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2152 status
= ata_chk_status(ap
);
2155 if (status
& ATA_BUSY
) {
2156 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2157 "(%lu secs)\n", tmout
/ HZ
);
2164 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2166 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2167 unsigned int dev0
= devmask
& (1 << 0);
2168 unsigned int dev1
= devmask
& (1 << 1);
2169 unsigned long timeout
;
2171 /* if device 0 was found in ata_devchk, wait for its
2175 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2177 /* if device 1 was found in ata_devchk, wait for
2178 * register access, then wait for BSY to clear
2180 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2184 ap
->ops
->dev_select(ap
, 1);
2185 if (ap
->flags
& ATA_FLAG_MMIO
) {
2186 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2187 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2189 nsect
= inb(ioaddr
->nsect_addr
);
2190 lbal
= inb(ioaddr
->lbal_addr
);
2192 if ((nsect
== 1) && (lbal
== 1))
2194 if (time_after(jiffies
, timeout
)) {
2198 msleep(50); /* give drive a breather */
2201 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2203 /* is all this really necessary? */
2204 ap
->ops
->dev_select(ap
, 0);
2206 ap
->ops
->dev_select(ap
, 1);
2208 ap
->ops
->dev_select(ap
, 0);
2211 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2212 unsigned int devmask
)
2214 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2216 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2218 /* software reset. causes dev0 to be selected */
2219 if (ap
->flags
& ATA_FLAG_MMIO
) {
2220 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2221 udelay(20); /* FIXME: flush */
2222 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2223 udelay(20); /* FIXME: flush */
2224 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2226 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2228 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2230 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2233 /* spec mandates ">= 2ms" before checking status.
2234 * We wait 150ms, because that was the magic delay used for
2235 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2236 * between when the ATA command register is written, and then
2237 * status is checked. Because waiting for "a while" before
2238 * checking status is fine, post SRST, we perform this magic
2239 * delay here as well.
2241 * Old drivers/ide uses the 2mS rule and then waits for ready
2245 /* Before we perform post reset processing we want to see if
2246 * the bus shows 0xFF because the odd clown forgets the D7
2247 * pulldown resistor.
2249 if (ata_check_status(ap
) == 0xFF) {
2250 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2251 return AC_ERR_OTHER
;
2254 ata_bus_post_reset(ap
, devmask
);
2260 * ata_bus_reset - reset host port and associated ATA channel
2261 * @ap: port to reset
2263 * This is typically the first time we actually start issuing
2264 * commands to the ATA channel. We wait for BSY to clear, then
2265 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2266 * result. Determine what devices, if any, are on the channel
2267 * by looking at the device 0/1 error register. Look at the signature
2268 * stored in each device's taskfile registers, to determine if
2269 * the device is ATA or ATAPI.
2272 * PCI/etc. bus probe sem.
2273 * Obtains host_set lock.
2276 * Sets ATA_FLAG_DISABLED if bus reset fails.
2279 void ata_bus_reset(struct ata_port
*ap
)
2281 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2282 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2284 unsigned int dev0
, dev1
= 0, devmask
= 0;
2286 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2288 /* determine if device 0/1 are present */
2289 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2292 dev0
= ata_devchk(ap
, 0);
2294 dev1
= ata_devchk(ap
, 1);
2298 devmask
|= (1 << 0);
2300 devmask
|= (1 << 1);
2302 /* select device 0 again */
2303 ap
->ops
->dev_select(ap
, 0);
2305 /* issue bus reset */
2306 if (ap
->flags
& ATA_FLAG_SRST
)
2307 if (ata_bus_softreset(ap
, devmask
))
2311 * determine by signature whether we have ATA or ATAPI devices
2313 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2314 if ((slave_possible
) && (err
!= 0x81))
2315 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2317 /* re-enable interrupts */
2318 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2321 /* is double-select really necessary? */
2322 if (ap
->device
[1].class != ATA_DEV_NONE
)
2323 ap
->ops
->dev_select(ap
, 1);
2324 if (ap
->device
[0].class != ATA_DEV_NONE
)
2325 ap
->ops
->dev_select(ap
, 0);
2327 /* if no devices were detected, disable this port */
2328 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2329 (ap
->device
[1].class == ATA_DEV_NONE
))
2332 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2333 /* set up device control for ATA_FLAG_SATA_RESET */
2334 if (ap
->flags
& ATA_FLAG_MMIO
)
2335 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2337 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2344 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2345 ap
->ops
->port_disable(ap
);
2350 static int sata_phy_resume(struct ata_port
*ap
)
2352 unsigned long timeout
= jiffies
+ (HZ
* 5);
2353 u32 scontrol
, sstatus
;
2356 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2359 scontrol
= (scontrol
& 0x0f0) | 0x300;
2361 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2364 /* Wait for phy to become ready, if necessary. */
2367 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2369 if ((sstatus
& 0xf) != 1)
2371 } while (time_before(jiffies
, timeout
));
2377 * ata_std_probeinit - initialize probing
2378 * @ap: port to be probed
2380 * @ap is about to be probed. Initialize it. This function is
2381 * to be used as standard callback for ata_drive_probe_reset().
2383 * NOTE!!! Do not use this function as probeinit if a low level
2384 * driver implements only hardreset. Just pass NULL as probeinit
2385 * in that case. Using this function is probably okay but doing
2386 * so makes reset sequence different from the original
2387 * ->phy_reset implementation and Jeff nervous. :-P
2389 void ata_std_probeinit(struct ata_port
*ap
)
2394 sata_phy_resume(ap
);
2396 /* init sata_spd_limit to the current value */
2397 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
2398 int spd
= (scontrol
>> 4) & 0xf;
2399 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2402 /* wait for device */
2403 if (ata_port_online(ap
))
2404 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2408 * ata_std_softreset - reset host port via ATA SRST
2409 * @ap: port to reset
2410 * @classes: resulting classes of attached devices
2412 * Reset host port using ATA SRST. This function is to be used
2413 * as standard callback for ata_drive_*_reset() functions.
2416 * Kernel thread context (may sleep)
2419 * 0 on success, -errno otherwise.
2421 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2423 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2424 unsigned int devmask
= 0, err_mask
;
2429 if (ata_port_offline(ap
)) {
2430 classes
[0] = ATA_DEV_NONE
;
2434 /* determine if device 0/1 are present */
2435 if (ata_devchk(ap
, 0))
2436 devmask
|= (1 << 0);
2437 if (slave_possible
&& ata_devchk(ap
, 1))
2438 devmask
|= (1 << 1);
2440 /* select device 0 again */
2441 ap
->ops
->dev_select(ap
, 0);
2443 /* issue bus reset */
2444 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2445 err_mask
= ata_bus_softreset(ap
, devmask
);
2447 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2452 /* determine by signature whether we have ATA or ATAPI devices */
2453 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2454 if (slave_possible
&& err
!= 0x81)
2455 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2458 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2463 * sata_std_hardreset - reset host port via SATA phy reset
2464 * @ap: port to reset
2465 * @class: resulting class of attached device
2467 * SATA phy-reset host port using DET bits of SControl register.
2468 * This function is to be used as standard callback for
2469 * ata_drive_*_reset().
2472 * Kernel thread context (may sleep)
2475 * 0 on success, -errno otherwise.
2477 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2484 if (sata_set_spd_needed(ap
)) {
2485 /* SATA spec says nothing about how to reconfigure
2486 * spd. To be on the safe side, turn off phy during
2487 * reconfiguration. This works for at least ICH7 AHCI
2490 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2493 scontrol
= (scontrol
& 0x0f0) | 0x302;
2495 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2501 /* issue phy wake/reset */
2502 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2505 scontrol
= (scontrol
& 0x0f0) | 0x301;
2507 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2510 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2511 * 10.4.2 says at least 1 ms.
2515 /* bring phy back */
2516 sata_phy_resume(ap
);
2518 /* TODO: phy layer with polling, timeouts, etc. */
2519 if (ata_port_offline(ap
)) {
2520 *class = ATA_DEV_NONE
;
2521 DPRINTK("EXIT, link offline\n");
2525 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2526 ata_port_printk(ap
, KERN_ERR
,
2527 "COMRESET failed (device not ready)\n");
2531 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2533 *class = ata_dev_try_classify(ap
, 0, NULL
);
2535 DPRINTK("EXIT, class=%u\n", *class);
2540 * ata_std_postreset - standard postreset callback
2541 * @ap: the target ata_port
2542 * @classes: classes of attached devices
2544 * This function is invoked after a successful reset. Note that
2545 * the device might have been reset more than once using
2546 * different reset methods before postreset is invoked.
2548 * This function is to be used as standard callback for
2549 * ata_drive_*_reset().
2552 * Kernel thread context (may sleep)
2554 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2560 /* print link status */
2561 sata_print_link_status(ap
);
2564 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2565 sata_scr_write(ap
, SCR_ERROR
, serror
);
2567 /* re-enable interrupts */
2568 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2571 /* is double-select really necessary? */
2572 if (classes
[0] != ATA_DEV_NONE
)
2573 ap
->ops
->dev_select(ap
, 1);
2574 if (classes
[1] != ATA_DEV_NONE
)
2575 ap
->ops
->dev_select(ap
, 0);
2577 /* bail out if no device is present */
2578 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2579 DPRINTK("EXIT, no device\n");
2583 /* set up device control */
2584 if (ap
->ioaddr
.ctl_addr
) {
2585 if (ap
->flags
& ATA_FLAG_MMIO
)
2586 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2588 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2595 * ata_std_probe_reset - standard probe reset method
2596 * @ap: prot to perform probe-reset
2597 * @classes: resulting classes of attached devices
2599 * The stock off-the-shelf ->probe_reset method.
2602 * Kernel thread context (may sleep)
2605 * 0 on success, -errno otherwise.
2607 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2609 ata_reset_fn_t hardreset
;
2612 if (sata_scr_valid(ap
))
2613 hardreset
= sata_std_hardreset
;
2615 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2616 ata_std_softreset
, hardreset
,
2617 ata_std_postreset
, classes
);
2620 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2621 unsigned int *classes
)
2625 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2626 classes
[i
] = ATA_DEV_UNKNOWN
;
2628 rc
= reset(ap
, classes
);
2632 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2633 * is complete and convert all ATA_DEV_UNKNOWN to
2636 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2637 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2640 if (i
< ATA_MAX_DEVICES
)
2641 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2642 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2643 classes
[i
] = ATA_DEV_NONE
;
2649 * ata_drive_probe_reset - Perform probe reset with given methods
2650 * @ap: port to reset
2651 * @probeinit: probeinit method (can be NULL)
2652 * @softreset: softreset method (can be NULL)
2653 * @hardreset: hardreset method (can be NULL)
2654 * @postreset: postreset method (can be NULL)
2655 * @classes: resulting classes of attached devices
2657 * Reset the specified port and classify attached devices using
2658 * given methods. This function prefers softreset but tries all
2659 * possible reset sequences to reset and classify devices. This
2660 * function is intended to be used for constructing ->probe_reset
2661 * callback by low level drivers.
2663 * Reset methods should follow the following rules.
2665 * - Return 0 on sucess, -errno on failure.
2666 * - If classification is supported, fill classes[] with
2667 * recognized class codes.
2668 * - If classification is not supported, leave classes[] alone.
2671 * Kernel thread context (may sleep)
2674 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2675 * if classification fails, and any error code from reset
2678 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2679 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2680 ata_postreset_fn_t postreset
, unsigned int *classes
)
2687 if (softreset
&& !sata_set_spd_needed(ap
)) {
2688 rc
= ata_do_reset(ap
, softreset
, classes
);
2689 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2691 ata_port_printk(ap
, KERN_INFO
, "softreset failed, "
2692 "will try hardreset in 5 secs\n");
2700 rc
= ata_do_reset(ap
, hardreset
, classes
);
2702 if (classes
[0] != ATA_DEV_UNKNOWN
)
2707 if (sata_down_spd_limit(ap
))
2710 ata_port_printk(ap
, KERN_INFO
, "hardreset failed, "
2711 "will retry in 5 secs\n");
2716 ata_port_printk(ap
, KERN_INFO
,
2717 "hardreset succeeded without classification, "
2718 "will retry softreset in 5 secs\n");
2721 rc
= ata_do_reset(ap
, softreset
, classes
);
2727 postreset(ap
, classes
);
2728 if (classes
[0] == ATA_DEV_UNKNOWN
)
2735 * ata_dev_same_device - Determine whether new ID matches configured device
2736 * @dev: device to compare against
2737 * @new_class: class of the new device
2738 * @new_id: IDENTIFY page of the new device
2740 * Compare @new_class and @new_id against @dev and determine
2741 * whether @dev is the device indicated by @new_class and
2748 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2750 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2753 const u16
*old_id
= dev
->id
;
2754 unsigned char model
[2][41], serial
[2][21];
2757 if (dev
->class != new_class
) {
2758 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2759 dev
->class, new_class
);
2763 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2764 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2765 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2766 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2767 new_n_sectors
= ata_id_n_sectors(new_id
);
2769 if (strcmp(model
[0], model
[1])) {
2770 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2771 "'%s' != '%s'\n", model
[0], model
[1]);
2775 if (strcmp(serial
[0], serial
[1])) {
2776 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2777 "'%s' != '%s'\n", serial
[0], serial
[1]);
2781 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2782 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2784 (unsigned long long)dev
->n_sectors
,
2785 (unsigned long long)new_n_sectors
);
2793 * ata_dev_revalidate - Revalidate ATA device
2794 * @dev: device to revalidate
2795 * @post_reset: is this revalidation after reset?
2797 * Re-read IDENTIFY page and make sure @dev is still attached to
2801 * Kernel thread context (may sleep)
2804 * 0 on success, negative errno otherwise
2806 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2808 unsigned int class = dev
->class;
2809 u16
*id
= (void *)dev
->ap
->sector_buf
;
2812 if (!ata_dev_enabled(dev
)) {
2818 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2822 /* is the device still there? */
2823 if (!ata_dev_same_device(dev
, class, id
)) {
2828 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2830 /* configure device according to the new ID */
2831 rc
= ata_dev_configure(dev
, 0);
2836 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2840 static const char * const ata_dma_blacklist
[] = {
2841 "WDC AC11000H", NULL
,
2842 "WDC AC22100H", NULL
,
2843 "WDC AC32500H", NULL
,
2844 "WDC AC33100H", NULL
,
2845 "WDC AC31600H", NULL
,
2846 "WDC AC32100H", "24.09P07",
2847 "WDC AC23200L", "21.10N21",
2848 "Compaq CRD-8241B", NULL
,
2853 "SanDisk SDP3B", NULL
,
2854 "SanDisk SDP3B-64", NULL
,
2855 "SANYO CD-ROM CRD", NULL
,
2856 "HITACHI CDR-8", NULL
,
2857 "HITACHI CDR-8335", NULL
,
2858 "HITACHI CDR-8435", NULL
,
2859 "Toshiba CD-ROM XM-6202B", NULL
,
2860 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2862 "E-IDE CD-ROM CR-840", NULL
,
2863 "CD-ROM Drive/F5A", NULL
,
2864 "WPI CDD-820", NULL
,
2865 "SAMSUNG CD-ROM SC-148C", NULL
,
2866 "SAMSUNG CD-ROM SC", NULL
,
2867 "SanDisk SDP3B-64", NULL
,
2868 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2869 "_NEC DV5800A", NULL
,
2870 "SAMSUNG CD-ROM SN-124", "N001"
2873 static int ata_strim(char *s
, size_t len
)
2875 len
= strnlen(s
, len
);
2877 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2878 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2885 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2887 unsigned char model_num
[40];
2888 unsigned char model_rev
[16];
2889 unsigned int nlen
, rlen
;
2892 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2894 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2896 nlen
= ata_strim(model_num
, sizeof(model_num
));
2897 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2899 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2900 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2901 if (ata_dma_blacklist
[i
+1] == NULL
)
2903 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2911 * ata_dev_xfermask - Compute supported xfermask of the given device
2912 * @dev: Device to compute xfermask for
2914 * Compute supported xfermask of @dev and store it in
2915 * dev->*_mask. This function is responsible for applying all
2916 * known limits including host controller limits, device
2919 * FIXME: The current implementation limits all transfer modes to
2920 * the fastest of the lowested device on the port. This is not
2921 * required on most controllers.
2926 static void ata_dev_xfermask(struct ata_device
*dev
)
2928 struct ata_port
*ap
= dev
->ap
;
2929 struct ata_host_set
*hs
= ap
->host_set
;
2930 unsigned long xfer_mask
;
2933 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2934 ap
->mwdma_mask
, ap
->udma_mask
);
2936 /* Apply cable rule here. Don't apply it early because when
2937 * we handle hot plug the cable type can itself change.
2939 if (ap
->cbl
== ATA_CBL_PATA40
)
2940 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2942 /* FIXME: Use port-wide xfermask for now */
2943 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2944 struct ata_device
*d
= &ap
->device
[i
];
2946 if (ata_dev_absent(d
))
2949 if (ata_dev_disabled(d
)) {
2950 /* to avoid violating device selection timing */
2951 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2952 UINT_MAX
, UINT_MAX
);
2956 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2957 d
->mwdma_mask
, d
->udma_mask
);
2958 xfer_mask
&= ata_id_xfermask(d
->id
);
2959 if (ata_dma_blacklisted(d
))
2960 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2963 if (ata_dma_blacklisted(dev
))
2964 ata_dev_printk(dev
, KERN_WARNING
,
2965 "device is on DMA blacklist, disabling DMA\n");
2967 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2968 if (hs
->simplex_claimed
)
2969 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2972 if (ap
->ops
->mode_filter
)
2973 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2975 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2976 &dev
->mwdma_mask
, &dev
->udma_mask
);
2980 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2981 * @dev: Device to which command will be sent
2983 * Issue SET FEATURES - XFER MODE command to device @dev
2987 * PCI/etc. bus probe sem.
2990 * 0 on success, AC_ERR_* mask otherwise.
2993 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
2995 struct ata_taskfile tf
;
2996 unsigned int err_mask
;
2998 /* set up set-features taskfile */
2999 DPRINTK("set features - xfer mode\n");
3001 ata_tf_init(dev
, &tf
);
3002 tf
.command
= ATA_CMD_SET_FEATURES
;
3003 tf
.feature
= SETFEATURES_XFER
;
3004 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3005 tf
.protocol
= ATA_PROT_NODATA
;
3006 tf
.nsect
= dev
->xfer_mode
;
3008 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3010 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3015 * ata_dev_init_params - Issue INIT DEV PARAMS command
3016 * @dev: Device to which command will be sent
3017 * @heads: Number of heads
3018 * @sectors: Number of sectors
3021 * Kernel thread context (may sleep)
3024 * 0 on success, AC_ERR_* mask otherwise.
3026 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3027 u16 heads
, u16 sectors
)
3029 struct ata_taskfile tf
;
3030 unsigned int err_mask
;
3032 /* Number of sectors per track 1-255. Number of heads 1-16 */
3033 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3034 return AC_ERR_INVALID
;
3036 /* set up init dev params taskfile */
3037 DPRINTK("init dev params \n");
3039 ata_tf_init(dev
, &tf
);
3040 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3041 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3042 tf
.protocol
= ATA_PROT_NODATA
;
3044 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3046 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3048 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3053 * ata_sg_clean - Unmap DMA memory associated with command
3054 * @qc: Command containing DMA memory to be released
3056 * Unmap all mapped DMA memory associated with this command.
3059 * spin_lock_irqsave(host_set lock)
3062 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3064 struct ata_port
*ap
= qc
->ap
;
3065 struct scatterlist
*sg
= qc
->__sg
;
3066 int dir
= qc
->dma_dir
;
3067 void *pad_buf
= NULL
;
3069 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3070 WARN_ON(sg
== NULL
);
3072 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3073 WARN_ON(qc
->n_elem
> 1);
3075 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3077 /* if we padded the buffer out to 32-bit bound, and data
3078 * xfer direction is from-device, we must copy from the
3079 * pad buffer back into the supplied buffer
3081 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3082 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3084 if (qc
->flags
& ATA_QCFLAG_SG
) {
3086 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3087 /* restore last sg */
3088 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3090 struct scatterlist
*psg
= &qc
->pad_sgent
;
3091 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3092 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3093 kunmap_atomic(addr
, KM_IRQ0
);
3097 dma_unmap_single(ap
->dev
,
3098 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3101 sg
->length
+= qc
->pad_len
;
3103 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3104 pad_buf
, qc
->pad_len
);
3107 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3112 * ata_fill_sg - Fill PCI IDE PRD table
3113 * @qc: Metadata associated with taskfile to be transferred
3115 * Fill PCI IDE PRD (scatter-gather) table with segments
3116 * associated with the current disk command.
3119 * spin_lock_irqsave(host_set lock)
3122 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3124 struct ata_port
*ap
= qc
->ap
;
3125 struct scatterlist
*sg
;
3128 WARN_ON(qc
->__sg
== NULL
);
3129 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3132 ata_for_each_sg(sg
, qc
) {
3136 /* determine if physical DMA addr spans 64K boundary.
3137 * Note h/w doesn't support 64-bit, so we unconditionally
3138 * truncate dma_addr_t to u32.
3140 addr
= (u32
) sg_dma_address(sg
);
3141 sg_len
= sg_dma_len(sg
);
3144 offset
= addr
& 0xffff;
3146 if ((offset
+ sg_len
) > 0x10000)
3147 len
= 0x10000 - offset
;
3149 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3150 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3151 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3160 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3163 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3164 * @qc: Metadata associated with taskfile to check
3166 * Allow low-level driver to filter ATA PACKET commands, returning
3167 * a status indicating whether or not it is OK to use DMA for the
3168 * supplied PACKET command.
3171 * spin_lock_irqsave(host_set lock)
3173 * RETURNS: 0 when ATAPI DMA can be used
3176 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3178 struct ata_port
*ap
= qc
->ap
;
3179 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3181 if (ap
->ops
->check_atapi_dma
)
3182 rc
= ap
->ops
->check_atapi_dma(qc
);
3187 * ata_qc_prep - Prepare taskfile for submission
3188 * @qc: Metadata associated with taskfile to be prepared
3190 * Prepare ATA taskfile for submission.
3193 * spin_lock_irqsave(host_set lock)
3195 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3197 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3203 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3206 * ata_sg_init_one - Associate command with memory buffer
3207 * @qc: Command to be associated
3208 * @buf: Memory buffer
3209 * @buflen: Length of memory buffer, in bytes.
3211 * Initialize the data-related elements of queued_cmd @qc
3212 * to point to a single memory buffer, @buf of byte length @buflen.
3215 * spin_lock_irqsave(host_set lock)
3218 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3220 struct scatterlist
*sg
;
3222 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3224 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3225 qc
->__sg
= &qc
->sgent
;
3227 qc
->orig_n_elem
= 1;
3231 sg_init_one(sg
, buf
, buflen
);
3235 * ata_sg_init - Associate command with scatter-gather table.
3236 * @qc: Command to be associated
3237 * @sg: Scatter-gather table.
3238 * @n_elem: Number of elements in s/g table.
3240 * Initialize the data-related elements of queued_cmd @qc
3241 * to point to a scatter-gather table @sg, containing @n_elem
3245 * spin_lock_irqsave(host_set lock)
3248 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3249 unsigned int n_elem
)
3251 qc
->flags
|= ATA_QCFLAG_SG
;
3253 qc
->n_elem
= n_elem
;
3254 qc
->orig_n_elem
= n_elem
;
3258 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3259 * @qc: Command with memory buffer to be mapped.
3261 * DMA-map the memory buffer associated with queued_cmd @qc.
3264 * spin_lock_irqsave(host_set lock)
3267 * Zero on success, negative on error.
3270 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3272 struct ata_port
*ap
= qc
->ap
;
3273 int dir
= qc
->dma_dir
;
3274 struct scatterlist
*sg
= qc
->__sg
;
3275 dma_addr_t dma_address
;
3278 /* we must lengthen transfers to end on a 32-bit boundary */
3279 qc
->pad_len
= sg
->length
& 3;
3281 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3282 struct scatterlist
*psg
= &qc
->pad_sgent
;
3284 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3286 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3288 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3289 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3292 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3293 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3295 sg
->length
-= qc
->pad_len
;
3296 if (sg
->length
== 0)
3299 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3300 sg
->length
, qc
->pad_len
);
3308 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3310 if (dma_mapping_error(dma_address
)) {
3312 sg
->length
+= qc
->pad_len
;
3316 sg_dma_address(sg
) = dma_address
;
3317 sg_dma_len(sg
) = sg
->length
;
3320 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3321 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3327 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3328 * @qc: Command with scatter-gather table to be mapped.
3330 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3333 * spin_lock_irqsave(host_set lock)
3336 * Zero on success, negative on error.
3340 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3342 struct ata_port
*ap
= qc
->ap
;
3343 struct scatterlist
*sg
= qc
->__sg
;
3344 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3345 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3347 VPRINTK("ENTER, ata%u\n", ap
->id
);
3348 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3350 /* we must lengthen transfers to end on a 32-bit boundary */
3351 qc
->pad_len
= lsg
->length
& 3;
3353 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3354 struct scatterlist
*psg
= &qc
->pad_sgent
;
3355 unsigned int offset
;
3357 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3359 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3362 * psg->page/offset are used to copy to-be-written
3363 * data in this function or read data in ata_sg_clean.
3365 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3366 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3367 psg
->offset
= offset_in_page(offset
);
3369 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3370 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3371 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3372 kunmap_atomic(addr
, KM_IRQ0
);
3375 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3376 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3378 lsg
->length
-= qc
->pad_len
;
3379 if (lsg
->length
== 0)
3382 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3383 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3386 pre_n_elem
= qc
->n_elem
;
3387 if (trim_sg
&& pre_n_elem
)
3396 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3398 /* restore last sg */
3399 lsg
->length
+= qc
->pad_len
;
3403 DPRINTK("%d sg elements mapped\n", n_elem
);
3406 qc
->n_elem
= n_elem
;
3412 * ata_poll_qc_complete - turn irq back on and finish qc
3413 * @qc: Command to complete
3414 * @err_mask: ATA status register content
3417 * None. (grabs host lock)
3420 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3422 struct ata_port
*ap
= qc
->ap
;
3423 unsigned long flags
;
3425 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3426 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3428 ata_qc_complete(qc
);
3429 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3433 * ata_pio_poll - poll using PIO, depending on current state
3434 * @qc: qc in progress
3437 * None. (executing in kernel thread context)
3440 * timeout value to use
3442 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3444 struct ata_port
*ap
= qc
->ap
;
3446 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3447 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3449 switch (ap
->hsm_task_state
) {
3452 poll_state
= HSM_ST_POLL
;
3456 case HSM_ST_LAST_POLL
:
3457 poll_state
= HSM_ST_LAST_POLL
;
3458 reg_state
= HSM_ST_LAST
;
3465 status
= ata_chk_status(ap
);
3466 if (status
& ATA_BUSY
) {
3467 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3468 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3469 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3472 ap
->hsm_task_state
= poll_state
;
3473 return ATA_SHORT_PAUSE
;
3476 ap
->hsm_task_state
= reg_state
;
3481 * ata_pio_complete - check if drive is busy or idle
3482 * @qc: qc to complete
3485 * None. (executing in kernel thread context)
3488 * Non-zero if qc completed, zero otherwise.
3490 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3492 struct ata_port
*ap
= qc
->ap
;
3496 * This is purely heuristic. This is a fast path. Sometimes when
3497 * we enter, BSY will be cleared in a chk-status or two. If not,
3498 * the drive is probably seeking or something. Snooze for a couple
3499 * msecs, then chk-status again. If still busy, fall back to
3500 * HSM_ST_POLL state.
3502 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3503 if (drv_stat
& ATA_BUSY
) {
3505 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3506 if (drv_stat
& ATA_BUSY
) {
3507 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3508 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3513 drv_stat
= ata_wait_idle(ap
);
3514 if (!ata_ok(drv_stat
)) {
3515 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3516 ap
->hsm_task_state
= HSM_ST_ERR
;
3520 ap
->hsm_task_state
= HSM_ST_IDLE
;
3522 WARN_ON(qc
->err_mask
);
3523 ata_poll_qc_complete(qc
);
3525 /* another command may start at this point */
3532 * swap_buf_le16 - swap halves of 16-bit words in place
3533 * @buf: Buffer to swap
3534 * @buf_words: Number of 16-bit words in buffer.
3536 * Swap halves of 16-bit words if needed to convert from
3537 * little-endian byte order to native cpu byte order, or
3541 * Inherited from caller.
3543 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3548 for (i
= 0; i
< buf_words
; i
++)
3549 buf
[i
] = le16_to_cpu(buf
[i
]);
3550 #endif /* __BIG_ENDIAN */
3554 * ata_mmio_data_xfer - Transfer data by MMIO
3555 * @ap: port to read/write
3557 * @buflen: buffer length
3558 * @write_data: read/write
3560 * Transfer data from/to the device data register by MMIO.
3563 * Inherited from caller.
3566 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3567 unsigned int buflen
, int write_data
)
3570 unsigned int words
= buflen
>> 1;
3571 u16
*buf16
= (u16
*) buf
;
3572 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3574 /* Transfer multiple of 2 bytes */
3576 for (i
= 0; i
< words
; i
++)
3577 writew(le16_to_cpu(buf16
[i
]), mmio
);
3579 for (i
= 0; i
< words
; i
++)
3580 buf16
[i
] = cpu_to_le16(readw(mmio
));
3583 /* Transfer trailing 1 byte, if any. */
3584 if (unlikely(buflen
& 0x01)) {
3585 u16 align_buf
[1] = { 0 };
3586 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3589 memcpy(align_buf
, trailing_buf
, 1);
3590 writew(le16_to_cpu(align_buf
[0]), mmio
);
3592 align_buf
[0] = cpu_to_le16(readw(mmio
));
3593 memcpy(trailing_buf
, align_buf
, 1);
3599 * ata_pio_data_xfer - Transfer data by PIO
3600 * @ap: port to read/write
3602 * @buflen: buffer length
3603 * @write_data: read/write
3605 * Transfer data from/to the device data register by PIO.
3608 * Inherited from caller.
3611 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3612 unsigned int buflen
, int write_data
)
3614 unsigned int words
= buflen
>> 1;
3616 /* Transfer multiple of 2 bytes */
3618 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3620 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3622 /* Transfer trailing 1 byte, if any. */
3623 if (unlikely(buflen
& 0x01)) {
3624 u16 align_buf
[1] = { 0 };
3625 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3628 memcpy(align_buf
, trailing_buf
, 1);
3629 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3631 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3632 memcpy(trailing_buf
, align_buf
, 1);
3638 * ata_data_xfer - Transfer data from/to the data register.
3639 * @ap: port to read/write
3641 * @buflen: buffer length
3642 * @do_write: read/write
3644 * Transfer data from/to the device data register.
3647 * Inherited from caller.
3650 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3651 unsigned int buflen
, int do_write
)
3653 /* Make the crap hardware pay the costs not the good stuff */
3654 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3655 unsigned long flags
;
3656 local_irq_save(flags
);
3657 if (ap
->flags
& ATA_FLAG_MMIO
)
3658 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3660 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3661 local_irq_restore(flags
);
3663 if (ap
->flags
& ATA_FLAG_MMIO
)
3664 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3666 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3671 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3672 * @qc: Command on going
3674 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3677 * Inherited from caller.
3680 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3682 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3683 struct scatterlist
*sg
= qc
->__sg
;
3684 struct ata_port
*ap
= qc
->ap
;
3686 unsigned int offset
;
3689 if (qc
->cursect
== (qc
->nsect
- 1))
3690 ap
->hsm_task_state
= HSM_ST_LAST
;
3692 page
= sg
[qc
->cursg
].page
;
3693 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3695 /* get the current page and offset */
3696 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3697 offset
%= PAGE_SIZE
;
3699 buf
= kmap(page
) + offset
;
3704 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3709 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3711 /* do the actual data transfer */
3712 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3713 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3719 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3720 * @qc: Command on going
3721 * @bytes: number of bytes
3723 * Transfer Transfer data from/to the ATAPI device.
3726 * Inherited from caller.
3730 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3732 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3733 struct scatterlist
*sg
= qc
->__sg
;
3734 struct ata_port
*ap
= qc
->ap
;
3737 unsigned int offset
, count
;
3739 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3740 ap
->hsm_task_state
= HSM_ST_LAST
;
3743 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3745 * The end of qc->sg is reached and the device expects
3746 * more data to transfer. In order not to overrun qc->sg
3747 * and fulfill length specified in the byte count register,
3748 * - for read case, discard trailing data from the device
3749 * - for write case, padding zero data to the device
3751 u16 pad_buf
[1] = { 0 };
3752 unsigned int words
= bytes
>> 1;
3755 if (words
) /* warning if bytes > 1 */
3756 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3757 "%u bytes trailing data\n", bytes
);
3759 for (i
= 0; i
< words
; i
++)
3760 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3762 ap
->hsm_task_state
= HSM_ST_LAST
;
3766 sg
= &qc
->__sg
[qc
->cursg
];
3769 offset
= sg
->offset
+ qc
->cursg_ofs
;
3771 /* get the current page and offset */
3772 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3773 offset
%= PAGE_SIZE
;
3775 /* don't overrun current sg */
3776 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3778 /* don't cross page boundaries */
3779 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3781 buf
= kmap(page
) + offset
;
3784 qc
->curbytes
+= count
;
3785 qc
->cursg_ofs
+= count
;
3787 if (qc
->cursg_ofs
== sg
->length
) {
3792 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3794 /* do the actual data transfer */
3795 ata_data_xfer(ap
, buf
, count
, do_write
);
3804 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3805 * @qc: Command on going
3807 * Transfer Transfer data from/to the ATAPI device.
3810 * Inherited from caller.
3813 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3815 struct ata_port
*ap
= qc
->ap
;
3816 struct ata_device
*dev
= qc
->dev
;
3817 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3818 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3820 ap
->ops
->tf_read(ap
, &qc
->tf
);
3821 ireason
= qc
->tf
.nsect
;
3822 bc_lo
= qc
->tf
.lbam
;
3823 bc_hi
= qc
->tf
.lbah
;
3824 bytes
= (bc_hi
<< 8) | bc_lo
;
3826 /* shall be cleared to zero, indicating xfer of data */
3827 if (ireason
& (1 << 0))
3830 /* make sure transfer direction matches expected */
3831 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3832 if (do_write
!= i_write
)
3835 __atapi_pio_bytes(qc
, bytes
);
3840 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3841 qc
->err_mask
|= AC_ERR_HSM
;
3842 ap
->hsm_task_state
= HSM_ST_ERR
;
3846 * ata_pio_block - start PIO on a block
3847 * @qc: qc to transfer block for
3850 * None. (executing in kernel thread context)
3852 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3854 struct ata_port
*ap
= qc
->ap
;
3858 * This is purely heuristic. This is a fast path.
3859 * Sometimes when we enter, BSY will be cleared in
3860 * a chk-status or two. If not, the drive is probably seeking
3861 * or something. Snooze for a couple msecs, then
3862 * chk-status again. If still busy, fall back to
3863 * HSM_ST_POLL state.
3865 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3866 if (status
& ATA_BUSY
) {
3868 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3869 if (status
& ATA_BUSY
) {
3870 ap
->hsm_task_state
= HSM_ST_POLL
;
3871 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3877 if (status
& (ATA_ERR
| ATA_DF
)) {
3878 qc
->err_mask
|= AC_ERR_DEV
;
3879 ap
->hsm_task_state
= HSM_ST_ERR
;
3883 /* transfer data if any */
3884 if (is_atapi_taskfile(&qc
->tf
)) {
3885 /* DRQ=0 means no more data to transfer */
3886 if ((status
& ATA_DRQ
) == 0) {
3887 ap
->hsm_task_state
= HSM_ST_LAST
;
3891 atapi_pio_bytes(qc
);
3893 /* handle BSY=0, DRQ=0 as error */
3894 if ((status
& ATA_DRQ
) == 0) {
3895 qc
->err_mask
|= AC_ERR_HSM
;
3896 ap
->hsm_task_state
= HSM_ST_ERR
;
3904 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3906 struct ata_port
*ap
= qc
->ap
;
3908 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3909 ata_dev_printk(qc
->dev
, KERN_WARNING
, "PIO error\n");
3911 /* make sure qc->err_mask is available to
3912 * know what's wrong and recover
3914 WARN_ON(qc
->err_mask
== 0);
3916 ap
->hsm_task_state
= HSM_ST_IDLE
;
3918 ata_poll_qc_complete(qc
);
3921 static void ata_pio_task(void *_data
)
3923 struct ata_queued_cmd
*qc
= _data
;
3924 struct ata_port
*ap
= qc
->ap
;
3925 unsigned long timeout
;
3932 switch (ap
->hsm_task_state
) {
3941 qc_completed
= ata_pio_complete(qc
);
3945 case HSM_ST_LAST_POLL
:
3946 timeout
= ata_pio_poll(qc
);
3956 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
3957 else if (!qc_completed
)
3962 * atapi_packet_task - Write CDB bytes to hardware
3963 * @_data: qc in progress
3965 * When device has indicated its readiness to accept
3966 * a CDB, this function is called. Send the CDB.
3967 * If DMA is to be performed, exit immediately.
3968 * Otherwise, we are in polling mode, so poll
3969 * status under operation succeeds or fails.
3972 * Kernel thread context (may sleep)
3974 static void atapi_packet_task(void *_data
)
3976 struct ata_queued_cmd
*qc
= _data
;
3977 struct ata_port
*ap
= qc
->ap
;
3980 /* sleep-wait for BSY to clear */
3981 DPRINTK("busy wait\n");
3982 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3983 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3987 /* make sure DRQ is set */
3988 status
= ata_chk_status(ap
);
3989 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3990 qc
->err_mask
|= AC_ERR_HSM
;
3995 DPRINTK("send cdb\n");
3996 WARN_ON(qc
->dev
->cdb_len
< 12);
3998 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3999 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4000 unsigned long flags
;
4002 /* Once we're done issuing command and kicking bmdma,
4003 * irq handler takes over. To not lose irq, we need
4004 * to clear NOINTR flag before sending cdb, but
4005 * interrupt handler shouldn't be invoked before we're
4006 * finished. Hence, the following locking.
4008 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4009 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4010 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4011 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4012 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4013 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4015 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4017 /* PIO commands are handled by polling */
4018 ap
->hsm_task_state
= HSM_ST
;
4019 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4025 ata_poll_qc_complete(qc
);
4029 * ata_qc_new - Request an available ATA command, for queueing
4030 * @ap: Port associated with device @dev
4031 * @dev: Device from whom we request an available command structure
4037 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4039 struct ata_queued_cmd
*qc
= NULL
;
4042 /* the last tag is reserved for internal command. */
4043 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4044 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4045 qc
= __ata_qc_from_tag(ap
, i
);
4056 * ata_qc_new_init - Request an available ATA command, and initialize it
4057 * @dev: Device from whom we request an available command structure
4063 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4065 struct ata_port
*ap
= dev
->ap
;
4066 struct ata_queued_cmd
*qc
;
4068 qc
= ata_qc_new(ap
);
4081 * ata_qc_free - free unused ata_queued_cmd
4082 * @qc: Command to complete
4084 * Designed to free unused ata_queued_cmd object
4085 * in case something prevents using it.
4088 * spin_lock_irqsave(host_set lock)
4090 void ata_qc_free(struct ata_queued_cmd
*qc
)
4092 struct ata_port
*ap
= qc
->ap
;
4095 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4099 if (likely(ata_tag_valid(tag
))) {
4100 qc
->tag
= ATA_TAG_POISON
;
4101 clear_bit(tag
, &ap
->qactive
);
4105 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4107 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4108 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4110 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4113 /* command should be marked inactive atomically with qc completion */
4114 qc
->ap
->active_tag
= ATA_TAG_POISON
;
4116 /* atapi: mark qc as inactive to prevent the interrupt handler
4117 * from completing the command twice later, before the error handler
4118 * is called. (when rc != 0 and atapi request sense is needed)
4120 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4122 /* call completion callback */
4123 qc
->complete_fn(qc
);
4127 * ata_qc_complete - Complete an active ATA command
4128 * @qc: Command to complete
4129 * @err_mask: ATA Status register contents
4131 * Indicate to the mid and upper layers that an ATA
4132 * command has completed, with either an ok or not-ok status.
4135 * spin_lock_irqsave(host_set lock)
4137 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4139 struct ata_port
*ap
= qc
->ap
;
4141 /* XXX: New EH and old EH use different mechanisms to
4142 * synchronize EH with regular execution path.
4144 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4145 * Normal execution path is responsible for not accessing a
4146 * failed qc. libata core enforces the rule by returning NULL
4147 * from ata_qc_from_tag() for failed qcs.
4149 * Old EH depends on ata_qc_complete() nullifying completion
4150 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4151 * not synchronize with interrupt handler. Only PIO task is
4154 if (ap
->ops
->error_handler
) {
4155 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4157 if (unlikely(qc
->err_mask
))
4158 qc
->flags
|= ATA_QCFLAG_FAILED
;
4160 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4161 if (!ata_tag_internal(qc
->tag
)) {
4162 /* always fill result TF for failed qc */
4163 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4164 ata_qc_schedule_eh(qc
);
4169 /* read result TF if requested */
4170 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4171 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4173 __ata_qc_complete(qc
);
4175 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4178 /* read result TF if failed or requested */
4179 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4180 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4182 __ata_qc_complete(qc
);
4186 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4188 struct ata_port
*ap
= qc
->ap
;
4190 switch (qc
->tf
.protocol
) {
4192 case ATA_PROT_ATAPI_DMA
:
4195 case ATA_PROT_ATAPI
:
4197 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4210 * ata_qc_issue - issue taskfile to device
4211 * @qc: command to issue to device
4213 * Prepare an ATA command to submission to device.
4214 * This includes mapping the data into a DMA-able
4215 * area, filling in the S/G table, and finally
4216 * writing the taskfile to hardware, starting the command.
4219 * spin_lock_irqsave(host_set lock)
4221 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4223 struct ata_port
*ap
= qc
->ap
;
4225 qc
->ap
->active_tag
= qc
->tag
;
4226 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4228 if (ata_should_dma_map(qc
)) {
4229 if (qc
->flags
& ATA_QCFLAG_SG
) {
4230 if (ata_sg_setup(qc
))
4232 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4233 if (ata_sg_setup_one(qc
))
4237 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4240 ap
->ops
->qc_prep(qc
);
4242 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4243 if (unlikely(qc
->err_mask
))
4248 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4249 qc
->err_mask
|= AC_ERR_SYSTEM
;
4251 ata_qc_complete(qc
);
4255 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4256 * @qc: command to issue to device
4258 * Using various libata functions and hooks, this function
4259 * starts an ATA command. ATA commands are grouped into
4260 * classes called "protocols", and issuing each type of protocol
4261 * is slightly different.
4263 * May be used as the qc_issue() entry in ata_port_operations.
4266 * spin_lock_irqsave(host_set lock)
4269 * Zero on success, AC_ERR_* mask on failure
4272 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4274 struct ata_port
*ap
= qc
->ap
;
4276 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4278 switch (qc
->tf
.protocol
) {
4279 case ATA_PROT_NODATA
:
4280 ata_tf_to_host(ap
, &qc
->tf
);
4284 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4285 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4286 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4289 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4290 ata_qc_set_polling(qc
);
4291 ata_tf_to_host(ap
, &qc
->tf
);
4292 ap
->hsm_task_state
= HSM_ST
;
4293 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4296 case ATA_PROT_ATAPI
:
4297 ata_qc_set_polling(qc
);
4298 ata_tf_to_host(ap
, &qc
->tf
);
4299 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4302 case ATA_PROT_ATAPI_NODATA
:
4303 ap
->flags
|= ATA_FLAG_NOINTR
;
4304 ata_tf_to_host(ap
, &qc
->tf
);
4305 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4308 case ATA_PROT_ATAPI_DMA
:
4309 ap
->flags
|= ATA_FLAG_NOINTR
;
4310 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4311 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4312 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4317 return AC_ERR_SYSTEM
;
4324 * ata_host_intr - Handle host interrupt for given (port, task)
4325 * @ap: Port on which interrupt arrived (possibly...)
4326 * @qc: Taskfile currently active in engine
4328 * Handle host interrupt for given queued command. Currently,
4329 * only DMA interrupts are handled. All other commands are
4330 * handled via polling with interrupts disabled (nIEN bit).
4333 * spin_lock_irqsave(host_set lock)
4336 * One if interrupt was handled, zero if not (shared irq).
4339 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4340 struct ata_queued_cmd
*qc
)
4342 u8 status
, host_stat
;
4344 switch (qc
->tf
.protocol
) {
4347 case ATA_PROT_ATAPI_DMA
:
4348 case ATA_PROT_ATAPI
:
4349 /* check status of DMA engine */
4350 host_stat
= ap
->ops
->bmdma_status(ap
);
4351 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4353 /* if it's not our irq... */
4354 if (!(host_stat
& ATA_DMA_INTR
))
4357 /* before we do anything else, clear DMA-Start bit */
4358 ap
->ops
->bmdma_stop(qc
);
4362 case ATA_PROT_ATAPI_NODATA
:
4363 case ATA_PROT_NODATA
:
4364 /* check altstatus */
4365 status
= ata_altstatus(ap
);
4366 if (status
& ATA_BUSY
)
4369 /* check main status, clearing INTRQ */
4370 status
= ata_chk_status(ap
);
4371 if (unlikely(status
& ATA_BUSY
))
4373 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4374 ap
->id
, qc
->tf
.protocol
, status
);
4376 /* ack bmdma irq events */
4377 ap
->ops
->irq_clear(ap
);
4379 /* complete taskfile transaction */
4380 qc
->err_mask
|= ac_err_mask(status
);
4381 ata_qc_complete(qc
);
4388 return 1; /* irq handled */
4391 ap
->stats
.idle_irq
++;
4394 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4395 ata_irq_ack(ap
, 0); /* debug trap */
4396 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4400 return 0; /* irq not handled */
4404 * ata_interrupt - Default ATA host interrupt handler
4405 * @irq: irq line (unused)
4406 * @dev_instance: pointer to our ata_host_set information structure
4409 * Default interrupt handler for PCI IDE devices. Calls
4410 * ata_host_intr() for each port that is not disabled.
4413 * Obtains host_set lock during operation.
4416 * IRQ_NONE or IRQ_HANDLED.
4419 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4421 struct ata_host_set
*host_set
= dev_instance
;
4423 unsigned int handled
= 0;
4424 unsigned long flags
;
4426 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4427 spin_lock_irqsave(&host_set
->lock
, flags
);
4429 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4430 struct ata_port
*ap
;
4432 ap
= host_set
->ports
[i
];
4434 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4435 struct ata_queued_cmd
*qc
;
4437 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4438 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4439 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4440 handled
|= ata_host_intr(ap
, qc
);
4444 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4446 return IRQ_RETVAL(handled
);
4450 * sata_scr_valid - test whether SCRs are accessible
4451 * @ap: ATA port to test SCR accessibility for
4453 * Test whether SCRs are accessible for @ap.
4459 * 1 if SCRs are accessible, 0 otherwise.
4461 int sata_scr_valid(struct ata_port
*ap
)
4463 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4467 * sata_scr_read - read SCR register of the specified port
4468 * @ap: ATA port to read SCR for
4470 * @val: Place to store read value
4472 * Read SCR register @reg of @ap into *@val. This function is
4473 * guaranteed to succeed if the cable type of the port is SATA
4474 * and the port implements ->scr_read.
4480 * 0 on success, negative errno on failure.
4482 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4484 if (sata_scr_valid(ap
)) {
4485 *val
= ap
->ops
->scr_read(ap
, reg
);
4492 * sata_scr_write - write SCR register of the specified port
4493 * @ap: ATA port to write SCR for
4494 * @reg: SCR to write
4495 * @val: value to write
4497 * Write @val to SCR register @reg of @ap. This function is
4498 * guaranteed to succeed if the cable type of the port is SATA
4499 * and the port implements ->scr_read.
4505 * 0 on success, negative errno on failure.
4507 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4509 if (sata_scr_valid(ap
)) {
4510 ap
->ops
->scr_write(ap
, reg
, val
);
4517 * sata_scr_write_flush - write SCR register of the specified port and flush
4518 * @ap: ATA port to write SCR for
4519 * @reg: SCR to write
4520 * @val: value to write
4522 * This function is identical to sata_scr_write() except that this
4523 * function performs flush after writing to the register.
4529 * 0 on success, negative errno on failure.
4531 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4533 if (sata_scr_valid(ap
)) {
4534 ap
->ops
->scr_write(ap
, reg
, val
);
4535 ap
->ops
->scr_read(ap
, reg
);
4542 * ata_port_online - test whether the given port is online
4543 * @ap: ATA port to test
4545 * Test whether @ap is online. Note that this function returns 0
4546 * if online status of @ap cannot be obtained, so
4547 * ata_port_online(ap) != !ata_port_offline(ap).
4553 * 1 if the port online status is available and online.
4555 int ata_port_online(struct ata_port
*ap
)
4559 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4565 * ata_port_offline - test whether the given port is offline
4566 * @ap: ATA port to test
4568 * Test whether @ap is offline. Note that this function returns
4569 * 0 if offline status of @ap cannot be obtained, so
4570 * ata_port_online(ap) != !ata_port_offline(ap).
4576 * 1 if the port offline status is available and offline.
4578 int ata_port_offline(struct ata_port
*ap
)
4582 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4588 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4589 * without filling any other registers
4591 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4593 struct ata_taskfile tf
;
4596 ata_tf_init(dev
, &tf
);
4599 tf
.flags
|= ATA_TFLAG_DEVICE
;
4600 tf
.protocol
= ATA_PROT_NODATA
;
4602 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4604 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4610 static int ata_flush_cache(struct ata_device
*dev
)
4614 if (!ata_try_flush_cache(dev
))
4617 if (ata_id_has_flush_ext(dev
->id
))
4618 cmd
= ATA_CMD_FLUSH_EXT
;
4620 cmd
= ATA_CMD_FLUSH
;
4622 return ata_do_simple_cmd(dev
, cmd
);
4625 static int ata_standby_drive(struct ata_device
*dev
)
4627 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4630 static int ata_start_drive(struct ata_device
*dev
)
4632 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4636 * ata_device_resume - wakeup a previously suspended devices
4637 * @dev: the device to resume
4639 * Kick the drive back into action, by sending it an idle immediate
4640 * command and making sure its transfer mode matches between drive
4644 int ata_device_resume(struct ata_device
*dev
)
4646 struct ata_port
*ap
= dev
->ap
;
4648 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4649 struct ata_device
*failed_dev
;
4650 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4651 while (ata_set_mode(ap
, &failed_dev
))
4652 ata_dev_disable(failed_dev
);
4654 if (!ata_dev_enabled(dev
))
4656 if (dev
->class == ATA_DEV_ATA
)
4657 ata_start_drive(dev
);
4663 * ata_device_suspend - prepare a device for suspend
4664 * @dev: the device to suspend
4666 * Flush the cache on the drive, if appropriate, then issue a
4667 * standbynow command.
4669 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
4671 struct ata_port
*ap
= dev
->ap
;
4673 if (!ata_dev_enabled(dev
))
4675 if (dev
->class == ATA_DEV_ATA
)
4676 ata_flush_cache(dev
);
4678 if (state
.event
!= PM_EVENT_FREEZE
)
4679 ata_standby_drive(dev
);
4680 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4685 * ata_port_start - Set port up for dma.
4686 * @ap: Port to initialize
4688 * Called just after data structures for each port are
4689 * initialized. Allocates space for PRD table.
4691 * May be used as the port_start() entry in ata_port_operations.
4694 * Inherited from caller.
4697 int ata_port_start (struct ata_port
*ap
)
4699 struct device
*dev
= ap
->dev
;
4702 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4706 rc
= ata_pad_alloc(ap
, dev
);
4708 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4712 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4719 * ata_port_stop - Undo ata_port_start()
4720 * @ap: Port to shut down
4722 * Frees the PRD table.
4724 * May be used as the port_stop() entry in ata_port_operations.
4727 * Inherited from caller.
4730 void ata_port_stop (struct ata_port
*ap
)
4732 struct device
*dev
= ap
->dev
;
4734 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4735 ata_pad_free(ap
, dev
);
4738 void ata_host_stop (struct ata_host_set
*host_set
)
4740 if (host_set
->mmio_base
)
4741 iounmap(host_set
->mmio_base
);
4746 * ata_host_remove - Unregister SCSI host structure with upper layers
4747 * @ap: Port to unregister
4748 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4751 * Inherited from caller.
4754 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4756 struct Scsi_Host
*sh
= ap
->host
;
4761 scsi_remove_host(sh
);
4763 ap
->ops
->port_stop(ap
);
4767 * ata_host_init - Initialize an ata_port structure
4768 * @ap: Structure to initialize
4769 * @host: associated SCSI mid-layer structure
4770 * @host_set: Collection of hosts to which @ap belongs
4771 * @ent: Probe information provided by low-level driver
4772 * @port_no: Port number associated with this ata_port
4774 * Initialize a new ata_port structure, and its associated
4778 * Inherited from caller.
4781 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4782 struct ata_host_set
*host_set
,
4783 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4789 host
->max_channel
= 1;
4790 host
->unique_id
= ata_unique_id
++;
4791 host
->max_cmd_len
= 12;
4793 ap
->flags
= ATA_FLAG_DISABLED
;
4794 ap
->id
= host
->unique_id
;
4796 ap
->ctl
= ATA_DEVCTL_OBS
;
4797 ap
->host_set
= host_set
;
4799 ap
->port_no
= port_no
;
4801 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4802 ap
->pio_mask
= ent
->pio_mask
;
4803 ap
->mwdma_mask
= ent
->mwdma_mask
;
4804 ap
->udma_mask
= ent
->udma_mask
;
4805 ap
->flags
|= ent
->host_flags
;
4806 ap
->ops
= ent
->port_ops
;
4807 ap
->sata_spd_limit
= UINT_MAX
;
4808 ap
->active_tag
= ATA_TAG_POISON
;
4809 ap
->last_ctl
= 0xFF;
4811 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4812 INIT_LIST_HEAD(&ap
->eh_done_q
);
4814 /* set cable type */
4815 ap
->cbl
= ATA_CBL_NONE
;
4816 if (ap
->flags
& ATA_FLAG_SATA
)
4817 ap
->cbl
= ATA_CBL_SATA
;
4819 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4820 struct ata_device
*dev
= &ap
->device
[i
];
4823 dev
->pio_mask
= UINT_MAX
;
4824 dev
->mwdma_mask
= UINT_MAX
;
4825 dev
->udma_mask
= UINT_MAX
;
4829 ap
->stats
.unhandled_irq
= 1;
4830 ap
->stats
.idle_irq
= 1;
4833 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4837 * ata_host_add - Attach low-level ATA driver to system
4838 * @ent: Information provided by low-level driver
4839 * @host_set: Collections of ports to which we add
4840 * @port_no: Port number associated with this host
4842 * Attach low-level ATA driver to system.
4845 * PCI/etc. bus probe sem.
4848 * New ata_port on success, for NULL on error.
4851 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4852 struct ata_host_set
*host_set
,
4853 unsigned int port_no
)
4855 struct Scsi_Host
*host
;
4856 struct ata_port
*ap
;
4861 if (!ent
->port_ops
->probe_reset
&&
4862 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4863 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4868 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4872 host
->transportt
= &ata_scsi_transport_template
;
4874 ap
= ata_shost_to_port(host
);
4876 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4878 rc
= ap
->ops
->port_start(ap
);
4885 scsi_host_put(host
);
4890 * ata_device_add - Register hardware device with ATA and SCSI layers
4891 * @ent: Probe information describing hardware device to be registered
4893 * This function processes the information provided in the probe
4894 * information struct @ent, allocates the necessary ATA and SCSI
4895 * host information structures, initializes them, and registers
4896 * everything with requisite kernel subsystems.
4898 * This function requests irqs, probes the ATA bus, and probes
4902 * PCI/etc. bus probe sem.
4905 * Number of ports registered. Zero on error (no ports registered).
4908 int ata_device_add(const struct ata_probe_ent
*ent
)
4910 unsigned int count
= 0, i
;
4911 struct device
*dev
= ent
->dev
;
4912 struct ata_host_set
*host_set
;
4915 /* alloc a container for our list of ATA ports (buses) */
4916 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4917 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4920 spin_lock_init(&host_set
->lock
);
4922 host_set
->dev
= dev
;
4923 host_set
->n_ports
= ent
->n_ports
;
4924 host_set
->irq
= ent
->irq
;
4925 host_set
->mmio_base
= ent
->mmio_base
;
4926 host_set
->private_data
= ent
->private_data
;
4927 host_set
->ops
= ent
->port_ops
;
4928 host_set
->flags
= ent
->host_set_flags
;
4930 /* register each port bound to this device */
4931 for (i
= 0; i
< ent
->n_ports
; i
++) {
4932 struct ata_port
*ap
;
4933 unsigned long xfer_mode_mask
;
4935 ap
= ata_host_add(ent
, host_set
, i
);
4939 host_set
->ports
[i
] = ap
;
4940 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4941 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4942 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4944 /* print per-port info to dmesg */
4945 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
4946 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
4947 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4948 ata_mode_string(xfer_mode_mask
),
4949 ap
->ioaddr
.cmd_addr
,
4950 ap
->ioaddr
.ctl_addr
,
4951 ap
->ioaddr
.bmdma_addr
,
4955 host_set
->ops
->irq_clear(ap
);
4962 /* obtain irq, that is shared between channels */
4963 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4964 DRV_NAME
, host_set
))
4967 /* perform each probe synchronously */
4968 DPRINTK("probe begin\n");
4969 for (i
= 0; i
< count
; i
++) {
4970 struct ata_port
*ap
;
4973 ap
= host_set
->ports
[i
];
4975 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4976 rc
= ata_bus_probe(ap
);
4977 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4980 /* FIXME: do something useful here?
4981 * Current libata behavior will
4982 * tear down everything when
4983 * the module is removed
4984 * or the h/w is unplugged.
4988 rc
= scsi_add_host(ap
->host
, dev
);
4990 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
4991 /* FIXME: do something useful here */
4992 /* FIXME: handle unconditional calls to
4993 * scsi_scan_host and ata_host_remove, below,
4999 /* probes are done, now scan each port's disk(s) */
5000 DPRINTK("host probe begin\n");
5001 for (i
= 0; i
< count
; i
++) {
5002 struct ata_port
*ap
= host_set
->ports
[i
];
5004 ata_scsi_scan_host(ap
);
5007 dev_set_drvdata(dev
, host_set
);
5009 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5010 return ent
->n_ports
; /* success */
5013 for (i
= 0; i
< count
; i
++) {
5014 ata_host_remove(host_set
->ports
[i
], 1);
5015 scsi_host_put(host_set
->ports
[i
]->host
);
5019 VPRINTK("EXIT, returning 0\n");
5024 * ata_host_set_remove - PCI layer callback for device removal
5025 * @host_set: ATA host set that was removed
5027 * Unregister all objects associated with this host set. Free those
5031 * Inherited from calling layer (may sleep).
5034 void ata_host_set_remove(struct ata_host_set
*host_set
)
5036 struct ata_port
*ap
;
5039 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5040 ap
= host_set
->ports
[i
];
5041 scsi_remove_host(ap
->host
);
5044 free_irq(host_set
->irq
, host_set
);
5046 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5047 ap
= host_set
->ports
[i
];
5049 ata_scsi_release(ap
->host
);
5051 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5052 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5054 if (ioaddr
->cmd_addr
== 0x1f0)
5055 release_region(0x1f0, 8);
5056 else if (ioaddr
->cmd_addr
== 0x170)
5057 release_region(0x170, 8);
5060 scsi_host_put(ap
->host
);
5063 if (host_set
->ops
->host_stop
)
5064 host_set
->ops
->host_stop(host_set
);
5070 * ata_scsi_release - SCSI layer callback hook for host unload
5071 * @host: libata host to be unloaded
5073 * Performs all duties necessary to shut down a libata port...
5074 * Kill port kthread, disable port, and release resources.
5077 * Inherited from SCSI layer.
5083 int ata_scsi_release(struct Scsi_Host
*host
)
5085 struct ata_port
*ap
= ata_shost_to_port(host
);
5089 ap
->ops
->port_disable(ap
);
5090 ata_host_remove(ap
, 0);
5097 * ata_std_ports - initialize ioaddr with standard port offsets.
5098 * @ioaddr: IO address structure to be initialized
5100 * Utility function which initializes data_addr, error_addr,
5101 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5102 * device_addr, status_addr, and command_addr to standard offsets
5103 * relative to cmd_addr.
5105 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5108 void ata_std_ports(struct ata_ioports
*ioaddr
)
5110 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5111 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5112 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5113 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5114 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5115 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5116 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5117 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5118 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5119 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5125 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5127 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5129 pci_iounmap(pdev
, host_set
->mmio_base
);
5133 * ata_pci_remove_one - PCI layer callback for device removal
5134 * @pdev: PCI device that was removed
5136 * PCI layer indicates to libata via this hook that
5137 * hot-unplug or module unload event has occurred.
5138 * Handle this by unregistering all objects associated
5139 * with this PCI device. Free those objects. Then finally
5140 * release PCI resources and disable device.
5143 * Inherited from PCI layer (may sleep).
5146 void ata_pci_remove_one (struct pci_dev
*pdev
)
5148 struct device
*dev
= pci_dev_to_dev(pdev
);
5149 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5151 ata_host_set_remove(host_set
);
5152 pci_release_regions(pdev
);
5153 pci_disable_device(pdev
);
5154 dev_set_drvdata(dev
, NULL
);
5157 /* move to PCI subsystem */
5158 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5160 unsigned long tmp
= 0;
5162 switch (bits
->width
) {
5165 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5171 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5177 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5188 return (tmp
== bits
->val
) ? 1 : 0;
5191 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5193 pci_save_state(pdev
);
5194 pci_disable_device(pdev
);
5195 pci_set_power_state(pdev
, PCI_D3hot
);
5199 int ata_pci_device_resume(struct pci_dev
*pdev
)
5201 pci_set_power_state(pdev
, PCI_D0
);
5202 pci_restore_state(pdev
);
5203 pci_enable_device(pdev
);
5204 pci_set_master(pdev
);
5207 #endif /* CONFIG_PCI */
5210 static int __init
ata_init(void)
5212 ata_wq
= create_workqueue("ata");
5216 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5220 static void __exit
ata_exit(void)
5222 destroy_workqueue(ata_wq
);
5225 module_init(ata_init
);
5226 module_exit(ata_exit
);
5228 static unsigned long ratelimit_time
;
5229 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5231 int ata_ratelimit(void)
5234 unsigned long flags
;
5236 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5238 if (time_after(jiffies
, ratelimit_time
)) {
5240 ratelimit_time
= jiffies
+ (HZ
/5);
5244 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5250 * ata_wait_register - wait until register value changes
5251 * @reg: IO-mapped register
5252 * @mask: Mask to apply to read register value
5253 * @val: Wait condition
5254 * @interval_msec: polling interval in milliseconds
5255 * @timeout_msec: timeout in milliseconds
5257 * Waiting for some bits of register to change is a common
5258 * operation for ATA controllers. This function reads 32bit LE
5259 * IO-mapped register @reg and tests for the following condition.
5261 * (*@reg & mask) != val
5263 * If the condition is met, it returns; otherwise, the process is
5264 * repeated after @interval_msec until timeout.
5267 * Kernel thread context (may sleep)
5270 * The final register value.
5272 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5273 unsigned long interval_msec
,
5274 unsigned long timeout_msec
)
5276 unsigned long timeout
;
5279 tmp
= ioread32(reg
);
5281 /* Calculate timeout _after_ the first read to make sure
5282 * preceding writes reach the controller before starting to
5283 * eat away the timeout.
5285 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5287 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5288 msleep(interval_msec
);
5289 tmp
= ioread32(reg
);
5296 * libata is essentially a library of internal helper functions for
5297 * low-level ATA host controller drivers. As such, the API/ABI is
5298 * likely to change as new drivers are added and updated.
5299 * Do not depend on ABI/API stability.
5302 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5303 EXPORT_SYMBOL_GPL(ata_std_ports
);
5304 EXPORT_SYMBOL_GPL(ata_device_add
);
5305 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5306 EXPORT_SYMBOL_GPL(ata_sg_init
);
5307 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5308 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5309 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5310 EXPORT_SYMBOL_GPL(ata_tf_load
);
5311 EXPORT_SYMBOL_GPL(ata_tf_read
);
5312 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5313 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5314 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5315 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5316 EXPORT_SYMBOL_GPL(ata_check_status
);
5317 EXPORT_SYMBOL_GPL(ata_altstatus
);
5318 EXPORT_SYMBOL_GPL(ata_exec_command
);
5319 EXPORT_SYMBOL_GPL(ata_port_start
);
5320 EXPORT_SYMBOL_GPL(ata_port_stop
);
5321 EXPORT_SYMBOL_GPL(ata_host_stop
);
5322 EXPORT_SYMBOL_GPL(ata_interrupt
);
5323 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5324 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5325 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5326 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5327 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5328 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5329 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5330 EXPORT_SYMBOL_GPL(ata_port_probe
);
5331 EXPORT_SYMBOL_GPL(sata_set_spd
);
5332 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5333 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5334 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5335 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5336 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5337 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5338 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5339 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5340 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5341 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5342 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5343 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5344 EXPORT_SYMBOL_GPL(ata_port_disable
);
5345 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5346 EXPORT_SYMBOL_GPL(ata_wait_register
);
5347 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5348 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5349 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5350 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5351 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5352 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5353 EXPORT_SYMBOL_GPL(ata_host_intr
);
5354 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5355 EXPORT_SYMBOL_GPL(sata_scr_read
);
5356 EXPORT_SYMBOL_GPL(sata_scr_write
);
5357 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5358 EXPORT_SYMBOL_GPL(ata_port_online
);
5359 EXPORT_SYMBOL_GPL(ata_port_offline
);
5360 EXPORT_SYMBOL_GPL(ata_id_string
);
5361 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5362 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5364 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5365 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5366 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5369 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5370 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5371 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5372 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5373 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5374 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5375 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5376 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5377 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5378 #endif /* CONFIG_PCI */
5380 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5381 EXPORT_SYMBOL_GPL(ata_device_resume
);
5382 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5383 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5385 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5386 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5387 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);