2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
);
69 static int fgb(u32 bitmap
);
70 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
72 unsigned int *xfer_shift_out
);
73 static void ata_pio_error(struct ata_port
*ap
);
75 static unsigned int ata_unique_id
= 1;
76 static struct workqueue_struct
*ata_wq
;
78 int atapi_enabled
= 0;
79 module_param(atapi_enabled
, int, 0444);
80 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
83 module_param_named(fua
, libata_fua
, int, 0444);
84 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
86 MODULE_AUTHOR("Jeff Garzik");
87 MODULE_DESCRIPTION("Library module for ATA devices");
88 MODULE_LICENSE("GPL");
89 MODULE_VERSION(DRV_VERSION
);
93 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
94 * @tf: Taskfile to convert
95 * @fis: Buffer into which data will output
96 * @pmp: Port multiplier port
98 * Converts a standard ATA taskfile to a Serial ATA
99 * FIS structure (Register - Host to Device).
102 * Inherited from caller.
105 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
107 fis
[0] = 0x27; /* Register - Host to Device FIS */
108 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
109 bit 7 indicates Command FIS */
110 fis
[2] = tf
->command
;
111 fis
[3] = tf
->feature
;
118 fis
[8] = tf
->hob_lbal
;
119 fis
[9] = tf
->hob_lbam
;
120 fis
[10] = tf
->hob_lbah
;
121 fis
[11] = tf
->hob_feature
;
124 fis
[13] = tf
->hob_nsect
;
135 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
136 * @fis: Buffer from which data will be input
137 * @tf: Taskfile to output
139 * Converts a serial ATA FIS structure to a standard ATA taskfile.
142 * Inherited from caller.
145 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
147 tf
->command
= fis
[2]; /* status */
148 tf
->feature
= fis
[3]; /* error */
155 tf
->hob_lbal
= fis
[8];
156 tf
->hob_lbam
= fis
[9];
157 tf
->hob_lbah
= fis
[10];
160 tf
->hob_nsect
= fis
[13];
163 static const u8 ata_rw_cmds
[] = {
167 ATA_CMD_READ_MULTI_EXT
,
168 ATA_CMD_WRITE_MULTI_EXT
,
172 ATA_CMD_WRITE_MULTI_FUA_EXT
,
176 ATA_CMD_PIO_READ_EXT
,
177 ATA_CMD_PIO_WRITE_EXT
,
190 ATA_CMD_WRITE_FUA_EXT
194 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
195 * @qc: command to examine and configure
197 * Examine the device configuration and tf->flags to calculate
198 * the proper read/write commands and protocol to use.
203 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
205 struct ata_taskfile
*tf
= &qc
->tf
;
206 struct ata_device
*dev
= qc
->dev
;
209 int index
, fua
, lba48
, write
;
211 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
212 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
213 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
215 if (dev
->flags
& ATA_DFLAG_PIO
) {
216 tf
->protocol
= ATA_PROT_PIO
;
217 index
= dev
->multi_count
? 0 : 8;
218 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
219 /* Unable to use DMA due to host limitation */
220 tf
->protocol
= ATA_PROT_PIO
;
221 index
= dev
->multi_count
? 0 : 8;
223 tf
->protocol
= ATA_PROT_DMA
;
227 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
235 static const char * const xfer_mode_str
[] = {
255 * ata_udma_string - convert UDMA bit offset to string
256 * @mask: mask of bits supported; only highest bit counts.
258 * Determine string which represents the highest speed
259 * (highest bit in @udma_mask).
265 * Constant C string representing highest speed listed in
266 * @udma_mask, or the constant C string "<n/a>".
269 static const char *ata_mode_string(unsigned int mask
)
273 for (i
= 7; i
>= 0; i
--)
276 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
279 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
286 return xfer_mode_str
[i
];
290 * ata_pio_devchk - PATA device presence detection
291 * @ap: ATA channel to examine
292 * @device: Device to examine (starting at zero)
294 * This technique was originally described in
295 * Hale Landis's ATADRVR (www.ata-atapi.com), and
296 * later found its way into the ATA/ATAPI spec.
298 * Write a pattern to the ATA shadow registers,
299 * and if a device is present, it will respond by
300 * correctly storing and echoing back the
301 * ATA shadow register contents.
307 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
310 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
313 ap
->ops
->dev_select(ap
, device
);
315 outb(0x55, ioaddr
->nsect_addr
);
316 outb(0xaa, ioaddr
->lbal_addr
);
318 outb(0xaa, ioaddr
->nsect_addr
);
319 outb(0x55, ioaddr
->lbal_addr
);
321 outb(0x55, ioaddr
->nsect_addr
);
322 outb(0xaa, ioaddr
->lbal_addr
);
324 nsect
= inb(ioaddr
->nsect_addr
);
325 lbal
= inb(ioaddr
->lbal_addr
);
327 if ((nsect
== 0x55) && (lbal
== 0xaa))
328 return 1; /* we found a device */
330 return 0; /* nothing found */
334 * ata_mmio_devchk - PATA device presence detection
335 * @ap: ATA channel to examine
336 * @device: Device to examine (starting at zero)
338 * This technique was originally described in
339 * Hale Landis's ATADRVR (www.ata-atapi.com), and
340 * later found its way into the ATA/ATAPI spec.
342 * Write a pattern to the ATA shadow registers,
343 * and if a device is present, it will respond by
344 * correctly storing and echoing back the
345 * ATA shadow register contents.
351 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
354 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
357 ap
->ops
->dev_select(ap
, device
);
359 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
360 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
362 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
363 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
365 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
366 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
368 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
369 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
371 if ((nsect
== 0x55) && (lbal
== 0xaa))
372 return 1; /* we found a device */
374 return 0; /* nothing found */
378 * ata_devchk - PATA device presence detection
379 * @ap: ATA channel to examine
380 * @device: Device to examine (starting at zero)
382 * Dispatch ATA device presence detection, depending
383 * on whether we are using PIO or MMIO to talk to the
384 * ATA shadow registers.
390 static unsigned int ata_devchk(struct ata_port
*ap
,
393 if (ap
->flags
& ATA_FLAG_MMIO
)
394 return ata_mmio_devchk(ap
, device
);
395 return ata_pio_devchk(ap
, device
);
399 * ata_dev_classify - determine device type based on ATA-spec signature
400 * @tf: ATA taskfile register set for device to be identified
402 * Determine from taskfile register contents whether a device is
403 * ATA or ATAPI, as per "Signature and persistence" section
404 * of ATA/PI spec (volume 1, sect 5.14).
410 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
411 * the event of failure.
414 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
416 /* Apple's open source Darwin code hints that some devices only
417 * put a proper signature into the LBA mid/high registers,
418 * So, we only check those. It's sufficient for uniqueness.
421 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
422 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
423 DPRINTK("found ATA device by sig\n");
427 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
428 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
429 DPRINTK("found ATAPI device by sig\n");
430 return ATA_DEV_ATAPI
;
433 DPRINTK("unknown device\n");
434 return ATA_DEV_UNKNOWN
;
438 * ata_dev_try_classify - Parse returned ATA device signature
439 * @ap: ATA channel to examine
440 * @device: Device to examine (starting at zero)
441 * @r_err: Value of error register on completion
443 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
444 * an ATA/ATAPI-defined set of values is placed in the ATA
445 * shadow registers, indicating the results of device detection
448 * Select the ATA device, and read the values from the ATA shadow
449 * registers. Then parse according to the Error register value,
450 * and the spec-defined values examined by ata_dev_classify().
456 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
460 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
462 struct ata_taskfile tf
;
466 ap
->ops
->dev_select(ap
, device
);
468 memset(&tf
, 0, sizeof(tf
));
470 ap
->ops
->tf_read(ap
, &tf
);
475 /* see if device passed diags */
478 else if ((device
== 0) && (err
== 0x81))
483 /* determine if device is ATA or ATAPI */
484 class = ata_dev_classify(&tf
);
486 if (class == ATA_DEV_UNKNOWN
)
488 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
494 * ata_id_string - Convert IDENTIFY DEVICE page into string
495 * @id: IDENTIFY DEVICE results we will examine
496 * @s: string into which data is output
497 * @ofs: offset into identify device page
498 * @len: length of string to return. must be an even number.
500 * The strings in the IDENTIFY DEVICE page are broken up into
501 * 16-bit chunks. Run through the string, and output each
502 * 8-bit chunk linearly, regardless of platform.
508 void ata_id_string(const u16
*id
, unsigned char *s
,
509 unsigned int ofs
, unsigned int len
)
528 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
529 * @id: IDENTIFY DEVICE results we will examine
530 * @s: string into which data is output
531 * @ofs: offset into identify device page
532 * @len: length of string to return. must be an odd number.
534 * This function is identical to ata_id_string except that it
535 * trims trailing spaces and terminates the resulting string with
536 * null. @len must be actual maximum length (even number) + 1.
541 void ata_id_c_string(const u16
*id
, unsigned char *s
,
542 unsigned int ofs
, unsigned int len
)
548 ata_id_string(id
, s
, ofs
, len
- 1);
550 p
= s
+ strnlen(s
, len
- 1);
551 while (p
> s
&& p
[-1] == ' ')
556 static u64
ata_id_n_sectors(const u16
*id
)
558 if (ata_id_has_lba(id
)) {
559 if (ata_id_has_lba48(id
))
560 return ata_id_u64(id
, 100);
562 return ata_id_u32(id
, 60);
564 if (ata_id_current_chs_valid(id
))
565 return ata_id_u32(id
, 57);
567 return id
[1] * id
[3] * id
[6];
572 * ata_noop_dev_select - Select device 0/1 on ATA bus
573 * @ap: ATA channel to manipulate
574 * @device: ATA device (numbered from zero) to select
576 * This function performs no actual function.
578 * May be used as the dev_select() entry in ata_port_operations.
583 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
589 * ata_std_dev_select - Select device 0/1 on ATA bus
590 * @ap: ATA channel to manipulate
591 * @device: ATA device (numbered from zero) to select
593 * Use the method defined in the ATA specification to
594 * make either device 0, or device 1, active on the
595 * ATA channel. Works with both PIO and MMIO.
597 * May be used as the dev_select() entry in ata_port_operations.
603 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
608 tmp
= ATA_DEVICE_OBS
;
610 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
612 if (ap
->flags
& ATA_FLAG_MMIO
) {
613 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
615 outb(tmp
, ap
->ioaddr
.device_addr
);
617 ata_pause(ap
); /* needed; also flushes, for mmio */
621 * ata_dev_select - Select device 0/1 on ATA bus
622 * @ap: ATA channel to manipulate
623 * @device: ATA device (numbered from zero) to select
624 * @wait: non-zero to wait for Status register BSY bit to clear
625 * @can_sleep: non-zero if context allows sleeping
627 * Use the method defined in the ATA specification to
628 * make either device 0, or device 1, active on the
631 * This is a high-level version of ata_std_dev_select(),
632 * which additionally provides the services of inserting
633 * the proper pauses and status polling, where needed.
639 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
640 unsigned int wait
, unsigned int can_sleep
)
642 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
643 ap
->id
, device
, wait
);
648 ap
->ops
->dev_select(ap
, device
);
651 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
658 * ata_dump_id - IDENTIFY DEVICE info debugging output
659 * @id: IDENTIFY DEVICE page to dump
661 * Dump selected 16-bit words from the given IDENTIFY DEVICE
668 static inline void ata_dump_id(const u16
*id
)
670 DPRINTK("49==0x%04x "
680 DPRINTK("80==0x%04x "
690 DPRINTK("88==0x%04x "
697 * Compute the PIO modes available for this device. This is not as
698 * trivial as it seems if we must consider early devices correctly.
700 * FIXME: pre IDE drive timing (do we care ?).
703 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
707 /* Usual case. Word 53 indicates word 64 is valid */
708 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
709 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
715 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
716 number for the maximum. Turn it into a mask and return it */
717 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
719 /* But wait.. there's more. Design your standards by committee and
720 you too can get a free iordy field to process. However its the
721 speeds not the modes that are supported... Note drivers using the
722 timing API will get this right anyway */
726 ata_queue_pio_task(struct ata_port
*ap
)
728 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
729 queue_work(ata_wq
, &ap
->pio_task
);
733 ata_queue_delayed_pio_task(struct ata_port
*ap
, unsigned long delay
)
735 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
736 queue_delayed_work(ata_wq
, &ap
->pio_task
, delay
);
740 * ata_flush_pio_tasks - Flush pio_task
741 * @ap: the target ata_port
743 * After this function completes, pio_task is
744 * guranteed not to be running or scheduled.
747 * Kernel thread context (may sleep)
750 static void ata_flush_pio_tasks(struct ata_port
*ap
)
757 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
758 ap
->flags
|= ATA_FLAG_FLUSH_PIO_TASK
;
759 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
761 DPRINTK("flush #1\n");
762 flush_workqueue(ata_wq
);
765 * At this point, if a task is running, it's guaranteed to see
766 * the FLUSH flag; thus, it will never queue pio tasks again.
769 tmp
|= cancel_delayed_work(&ap
->pio_task
);
771 DPRINTK("flush #2\n");
772 flush_workqueue(ata_wq
);
775 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
776 ap
->flags
&= ~ATA_FLAG_FLUSH_PIO_TASK
;
777 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
782 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
784 struct completion
*waiting
= qc
->private_data
;
786 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
791 * ata_exec_internal - execute libata internal command
792 * @ap: Port to which the command is sent
793 * @dev: Device to which the command is sent
794 * @tf: Taskfile registers for the command and the result
795 * @dma_dir: Data tranfer direction of the command
796 * @buf: Data buffer of the command
797 * @buflen: Length of data buffer
799 * Executes libata internal command with timeout. @tf contains
800 * command on entry and result on return. Timeout and error
801 * conditions are reported via return value. No recovery action
802 * is taken after a command times out. It's caller's duty to
803 * clean up after timeout.
806 * None. Should be called with kernel context, might sleep.
810 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
811 struct ata_taskfile
*tf
,
812 int dma_dir
, void *buf
, unsigned int buflen
)
814 u8 command
= tf
->command
;
815 struct ata_queued_cmd
*qc
;
816 DECLARE_COMPLETION(wait
);
818 unsigned int err_mask
;
820 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
822 qc
= ata_qc_new_init(ap
, dev
);
826 qc
->dma_dir
= dma_dir
;
827 if (dma_dir
!= DMA_NONE
) {
828 ata_sg_init_one(qc
, buf
, buflen
);
829 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
832 qc
->private_data
= &wait
;
833 qc
->complete_fn
= ata_qc_complete_internal
;
835 qc
->err_mask
= ata_qc_issue(qc
);
839 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
841 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
842 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
844 /* We're racing with irq here. If we lose, the
845 * following test prevents us from completing the qc
846 * again. If completion irq occurs after here but
847 * before the caller cleans up, it will result in a
848 * spurious interrupt. We can live with that.
850 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
851 qc
->err_mask
= AC_ERR_TIMEOUT
;
853 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
857 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
861 err_mask
= qc
->err_mask
;
869 * ata_pio_need_iordy - check if iordy needed
872 * Check if the current speed of the device requires IORDY. Used
873 * by various controllers for chip configuration.
876 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
879 int speed
= adev
->pio_mode
- XFER_PIO_0
;
886 /* If we have no drive specific rule, then PIO 2 is non IORDY */
888 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
889 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
890 /* Is the speed faster than the drive allows non IORDY ? */
892 /* This is cycle times not frequency - watch the logic! */
893 if (pio
> 240) /* PIO2 is 240nS per cycle */
902 * ata_dev_read_id - Read ID data from the specified device
903 * @ap: port on which target device resides
904 * @dev: target device
905 * @p_class: pointer to class of the target device (may be changed)
906 * @post_reset: is this read ID post-reset?
907 * @id: buffer to fill IDENTIFY page into
909 * Read ID data from the specified device. ATA_CMD_ID_ATA is
910 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
911 * devices. This function also takes care of EDD signature
912 * misreporting (to be removed once EDD support is gone) and
913 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
916 * Kernel thread context (may sleep)
919 * 0 on success, -errno otherwise.
921 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
922 unsigned int *p_class
, int post_reset
, u16
*id
)
924 unsigned int class = *p_class
;
925 unsigned int using_edd
;
926 struct ata_taskfile tf
;
927 unsigned int err_mask
= 0;
931 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
933 if (ap
->ops
->probe_reset
||
934 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
939 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
942 ata_tf_init(ap
, &tf
, dev
->devno
);
946 tf
.command
= ATA_CMD_ID_ATA
;
949 tf
.command
= ATA_CMD_ID_ATAPI
;
953 reason
= "unsupported class";
957 tf
.protocol
= ATA_PROT_PIO
;
959 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
960 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
964 reason
= "I/O error";
966 if (err_mask
& ~AC_ERR_DEV
)
970 * arg! EDD works for all test cases, but seems to return
971 * the ATA signature for some ATAPI devices. Until the
972 * reason for this is found and fixed, we fix up the mess
973 * here. If IDENTIFY DEVICE returns command aborted
974 * (as ATAPI devices do), then we issue an
975 * IDENTIFY PACKET DEVICE.
977 * ATA software reset (SRST, the default) does not appear
978 * to have this problem.
980 if ((using_edd
) && (class == ATA_DEV_ATA
)) {
982 if (err
& ATA_ABORTED
) {
983 class = ATA_DEV_ATAPI
;
990 swap_buf_le16(id
, ATA_ID_WORDS
);
992 /* print device capabilities */
993 printk(KERN_DEBUG
"ata%u: dev %u cfg "
994 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
996 id
[49], id
[82], id
[83], id
[84], id
[85], id
[86], id
[87], id
[88]);
999 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1001 reason
= "device reports illegal type";
1005 if (post_reset
&& class == ATA_DEV_ATA
) {
1007 * The exact sequence expected by certain pre-ATA4 drives is:
1010 * INITIALIZE DEVICE PARAMETERS
1012 * Some drives were very specific about that exact sequence.
1014 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1015 err_mask
= ata_dev_init_params(ap
, dev
);
1018 reason
= "INIT_DEV_PARAMS failed";
1022 /* current CHS translation info (id[53-58]) might be
1023 * changed. reread the identify device info.
1034 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1035 ap
->id
, dev
->devno
, reason
);
1040 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1041 * @ap: port on which device we wish to probe resides
1042 * @device: device bus address, starting at zero
1044 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1045 * command, and read back the 512-byte device information page.
1046 * The device information page is fed to us via the standard
1047 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1048 * using standard PIO-IN paths)
1050 * After reading the device information page, we use several
1051 * bits of information from it to initialize data structures
1052 * that will be used during the lifetime of the ata_device.
1053 * Other data from the info page is used to disqualify certain
1054 * older ATA devices we do not wish to support.
1057 * Inherited from caller. Some functions called by this function
1058 * obtain the host_set lock.
1061 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1063 struct ata_device
*dev
= &ap
->device
[device
];
1064 unsigned long xfer_modes
;
1067 if (!ata_dev_present(dev
)) {
1068 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1073 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1075 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, dev
->id
);
1080 * common ATA, ATAPI feature tests
1083 /* we require DMA support (bits 8 of word 49) */
1084 if (!ata_id_has_dma(dev
->id
)) {
1085 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1089 /* quick-n-dirty find max transfer mode; for printk only */
1090 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1092 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1094 xfer_modes
= ata_pio_modes(dev
);
1096 ata_dump_id(dev
->id
);
1098 /* ATA-specific feature tests */
1099 if (dev
->class == ATA_DEV_ATA
) {
1100 dev
->n_sectors
= ata_id_n_sectors(dev
->id
);
1102 if (ata_id_has_lba(dev
->id
)) {
1103 dev
->flags
|= ATA_DFLAG_LBA
;
1105 if (ata_id_has_lba48(dev
->id
))
1106 dev
->flags
|= ATA_DFLAG_LBA48
;
1108 /* print device info to dmesg */
1109 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1111 ata_id_major_version(dev
->id
),
1112 ata_mode_string(xfer_modes
),
1113 (unsigned long long)dev
->n_sectors
,
1114 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1118 /* Default translation */
1119 dev
->cylinders
= dev
->id
[1];
1120 dev
->heads
= dev
->id
[3];
1121 dev
->sectors
= dev
->id
[6];
1123 if (ata_id_current_chs_valid(dev
->id
)) {
1124 /* Current CHS translation is valid. */
1125 dev
->cylinders
= dev
->id
[54];
1126 dev
->heads
= dev
->id
[55];
1127 dev
->sectors
= dev
->id
[56];
1130 /* print device info to dmesg */
1131 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1133 ata_id_major_version(dev
->id
),
1134 ata_mode_string(xfer_modes
),
1135 (unsigned long long)dev
->n_sectors
,
1136 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1140 if (dev
->id
[59] & 0x100) {
1141 dev
->multi_count
= dev
->id
[59] & 0xff;
1142 DPRINTK("ata%u: dev %u multi count %u\n",
1143 ap
->id
, device
, dev
->multi_count
);
1148 /* ATAPI-specific feature tests */
1149 else if (dev
->class == ATA_DEV_ATAPI
) {
1150 rc
= atapi_cdb_len(dev
->id
);
1151 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1152 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1155 dev
->cdb_len
= (unsigned int) rc
;
1157 if (ata_id_cdb_intr(dev
->id
))
1158 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1160 /* print device info to dmesg */
1161 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1163 ata_mode_string(xfer_modes
));
1166 ap
->host
->max_cmd_len
= 0;
1167 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1168 ap
->host
->max_cmd_len
= max_t(unsigned int,
1169 ap
->host
->max_cmd_len
,
1170 ap
->device
[i
].cdb_len
);
1172 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1176 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1179 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1180 DPRINTK("EXIT, err\n");
1184 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1185 struct ata_device
*dev
)
1187 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1191 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1198 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1200 /* limit bridge transfers to udma5, 200 sectors */
1201 if (ata_dev_knobble(ap
, &ap
->device
[i
])) {
1202 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1204 ap
->udma_mask
&= ATA_UDMA5
;
1205 ap
->device
[i
].max_sectors
= ATA_MAX_SECTORS
;
1208 if (ap
->ops
->dev_config
)
1209 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1213 * ata_bus_probe - Reset and probe ATA bus
1216 * Master ATA bus probing function. Initiates a hardware-dependent
1217 * bus reset, then attempts to identify any devices found on
1221 * PCI/etc. bus probe sem.
1224 * Zero on success, non-zero on error.
1227 static int ata_bus_probe(struct ata_port
*ap
)
1229 unsigned int i
, found
= 0;
1231 if (ap
->ops
->probe_reset
) {
1232 unsigned int classes
[ATA_MAX_DEVICES
];
1237 rc
= ap
->ops
->probe_reset(ap
, classes
);
1239 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1240 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1241 classes
[i
] = ATA_DEV_NONE
;
1242 ap
->device
[i
].class = classes
[i
];
1245 printk(KERN_ERR
"ata%u: probe reset failed, "
1246 "disabling port\n", ap
->id
);
1247 ata_port_disable(ap
);
1250 ap
->ops
->phy_reset(ap
);
1252 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1255 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1256 ata_dev_identify(ap
, i
);
1257 if (ata_dev_present(&ap
->device
[i
])) {
1259 ata_dev_config(ap
,i
);
1263 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1264 goto err_out_disable
;
1267 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1268 goto err_out_disable
;
1273 ap
->ops
->port_disable(ap
);
1279 * ata_port_probe - Mark port as enabled
1280 * @ap: Port for which we indicate enablement
1282 * Modify @ap data structure such that the system
1283 * thinks that the entire port is enabled.
1285 * LOCKING: host_set lock, or some other form of
1289 void ata_port_probe(struct ata_port
*ap
)
1291 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1295 * sata_print_link_status - Print SATA link status
1296 * @ap: SATA port to printk link status about
1298 * This function prints link speed and status of a SATA link.
1303 static void sata_print_link_status(struct ata_port
*ap
)
1308 if (!ap
->ops
->scr_read
)
1311 sstatus
= scr_read(ap
, SCR_STATUS
);
1313 if (sata_dev_present(ap
)) {
1314 tmp
= (sstatus
>> 4) & 0xf;
1317 else if (tmp
& (1 << 1))
1320 speed
= "<unknown>";
1321 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1322 ap
->id
, speed
, sstatus
);
1324 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1330 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1331 * @ap: SATA port associated with target SATA PHY.
1333 * This function issues commands to standard SATA Sxxx
1334 * PHY registers, to wake up the phy (and device), and
1335 * clear any reset condition.
1338 * PCI/etc. bus probe sem.
1341 void __sata_phy_reset(struct ata_port
*ap
)
1344 unsigned long timeout
= jiffies
+ (HZ
* 5);
1346 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1347 /* issue phy wake/reset */
1348 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1349 /* Couldn't find anything in SATA I/II specs, but
1350 * AHCI-1.1 10.4.2 says at least 1 ms. */
1353 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1355 /* wait for phy to become ready, if necessary */
1358 sstatus
= scr_read(ap
, SCR_STATUS
);
1359 if ((sstatus
& 0xf) != 1)
1361 } while (time_before(jiffies
, timeout
));
1363 /* print link status */
1364 sata_print_link_status(ap
);
1366 /* TODO: phy layer with polling, timeouts, etc. */
1367 if (sata_dev_present(ap
))
1370 ata_port_disable(ap
);
1372 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1375 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1376 ata_port_disable(ap
);
1380 ap
->cbl
= ATA_CBL_SATA
;
1384 * sata_phy_reset - Reset SATA bus.
1385 * @ap: SATA port associated with target SATA PHY.
1387 * This function resets the SATA bus, and then probes
1388 * the bus for devices.
1391 * PCI/etc. bus probe sem.
1394 void sata_phy_reset(struct ata_port
*ap
)
1396 __sata_phy_reset(ap
);
1397 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1403 * ata_port_disable - Disable port.
1404 * @ap: Port to be disabled.
1406 * Modify @ap data structure such that the system
1407 * thinks that the entire port is disabled, and should
1408 * never attempt to probe or communicate with devices
1411 * LOCKING: host_set lock, or some other form of
1415 void ata_port_disable(struct ata_port
*ap
)
1417 ap
->device
[0].class = ATA_DEV_NONE
;
1418 ap
->device
[1].class = ATA_DEV_NONE
;
1419 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1423 * This mode timing computation functionality is ported over from
1424 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1427 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1428 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1429 * for PIO 5, which is a nonstandard extension and UDMA6, which
1430 * is currently supported only by Maxtor drives.
1433 static const struct ata_timing ata_timing
[] = {
1435 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1436 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1437 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1438 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1440 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1441 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1442 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1444 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1446 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1447 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1448 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1450 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1451 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1452 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1454 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1455 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1456 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1458 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1459 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1460 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1462 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1467 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1468 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1470 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1472 q
->setup
= EZ(t
->setup
* 1000, T
);
1473 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1474 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1475 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1476 q
->active
= EZ(t
->active
* 1000, T
);
1477 q
->recover
= EZ(t
->recover
* 1000, T
);
1478 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1479 q
->udma
= EZ(t
->udma
* 1000, UT
);
1482 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1483 struct ata_timing
*m
, unsigned int what
)
1485 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1486 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1487 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1488 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1489 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1490 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1491 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1492 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1495 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1497 const struct ata_timing
*t
;
1499 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1500 if (t
->mode
== 0xFF)
1505 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1506 struct ata_timing
*t
, int T
, int UT
)
1508 const struct ata_timing
*s
;
1509 struct ata_timing p
;
1515 if (!(s
= ata_timing_find_mode(speed
)))
1518 memcpy(t
, s
, sizeof(*s
));
1521 * If the drive is an EIDE drive, it can tell us it needs extended
1522 * PIO/MW_DMA cycle timing.
1525 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1526 memset(&p
, 0, sizeof(p
));
1527 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1528 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1529 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1530 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1531 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1533 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1537 * Convert the timing to bus clock counts.
1540 ata_timing_quantize(t
, t
, T
, UT
);
1543 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1544 * S.M.A.R.T * and some other commands. We have to ensure that the
1545 * DMA cycle timing is slower/equal than the fastest PIO timing.
1548 if (speed
> XFER_PIO_4
) {
1549 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1550 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1554 * Lengthen active & recovery time so that cycle time is correct.
1557 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1558 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1559 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1562 if (t
->active
+ t
->recover
< t
->cycle
) {
1563 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1564 t
->recover
= t
->cycle
- t
->active
;
1570 static const struct {
1573 } xfer_mode_classes
[] = {
1574 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1575 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1576 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1579 static u8
base_from_shift(unsigned int shift
)
1583 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1584 if (xfer_mode_classes
[i
].shift
== shift
)
1585 return xfer_mode_classes
[i
].base
;
1590 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1595 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1598 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1599 dev
->flags
|= ATA_DFLAG_PIO
;
1601 ata_dev_set_xfermode(ap
, dev
);
1603 base
= base_from_shift(dev
->xfer_shift
);
1604 ofs
= dev
->xfer_mode
- base
;
1605 idx
= ofs
+ dev
->xfer_shift
;
1606 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1608 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1609 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1611 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1612 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1615 static int ata_host_set_pio(struct ata_port
*ap
)
1621 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1624 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1628 base
= base_from_shift(ATA_SHIFT_PIO
);
1629 xfer_mode
= base
+ x
;
1631 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1632 (int)base
, (int)xfer_mode
, mask
, x
);
1634 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1635 struct ata_device
*dev
= &ap
->device
[i
];
1636 if (ata_dev_present(dev
)) {
1637 dev
->pio_mode
= xfer_mode
;
1638 dev
->xfer_mode
= xfer_mode
;
1639 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1640 if (ap
->ops
->set_piomode
)
1641 ap
->ops
->set_piomode(ap
, dev
);
1648 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1649 unsigned int xfer_shift
)
1653 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1654 struct ata_device
*dev
= &ap
->device
[i
];
1655 if (ata_dev_present(dev
)) {
1656 dev
->dma_mode
= xfer_mode
;
1657 dev
->xfer_mode
= xfer_mode
;
1658 dev
->xfer_shift
= xfer_shift
;
1659 if (ap
->ops
->set_dmamode
)
1660 ap
->ops
->set_dmamode(ap
, dev
);
1666 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1667 * @ap: port on which timings will be programmed
1669 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1672 * PCI/etc. bus probe sem.
1674 static void ata_set_mode(struct ata_port
*ap
)
1676 unsigned int xfer_shift
;
1680 /* step 1: always set host PIO timings */
1681 rc
= ata_host_set_pio(ap
);
1685 /* step 2: choose the best data xfer mode */
1686 xfer_mode
= xfer_shift
= 0;
1687 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1691 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1692 if (xfer_shift
!= ATA_SHIFT_PIO
)
1693 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1695 /* step 4: update devices' xfer mode */
1696 ata_dev_set_mode(ap
, &ap
->device
[0]);
1697 ata_dev_set_mode(ap
, &ap
->device
[1]);
1699 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1702 if (ap
->ops
->post_set_mode
)
1703 ap
->ops
->post_set_mode(ap
);
1708 ata_port_disable(ap
);
1712 * ata_tf_to_host - issue ATA taskfile to host controller
1713 * @ap: port to which command is being issued
1714 * @tf: ATA taskfile register set
1716 * Issues ATA taskfile register set to ATA host controller,
1717 * with proper synchronization with interrupt handler and
1721 * spin_lock_irqsave(host_set lock)
1724 static inline void ata_tf_to_host(struct ata_port
*ap
,
1725 const struct ata_taskfile
*tf
)
1727 ap
->ops
->tf_load(ap
, tf
);
1728 ap
->ops
->exec_command(ap
, tf
);
1732 * ata_busy_sleep - sleep until BSY clears, or timeout
1733 * @ap: port containing status register to be polled
1734 * @tmout_pat: impatience timeout
1735 * @tmout: overall timeout
1737 * Sleep until ATA Status register bit BSY clears,
1738 * or a timeout occurs.
1743 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1744 unsigned long tmout_pat
, unsigned long tmout
)
1746 unsigned long timer_start
, timeout
;
1749 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1750 timer_start
= jiffies
;
1751 timeout
= timer_start
+ tmout_pat
;
1752 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1754 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1757 if (status
& ATA_BUSY
)
1758 printk(KERN_WARNING
"ata%u is slow to respond, "
1759 "please be patient\n", ap
->id
);
1761 timeout
= timer_start
+ tmout
;
1762 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1764 status
= ata_chk_status(ap
);
1767 if (status
& ATA_BUSY
) {
1768 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1769 ap
->id
, tmout
/ HZ
);
1776 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1778 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1779 unsigned int dev0
= devmask
& (1 << 0);
1780 unsigned int dev1
= devmask
& (1 << 1);
1781 unsigned long timeout
;
1783 /* if device 0 was found in ata_devchk, wait for its
1787 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1789 /* if device 1 was found in ata_devchk, wait for
1790 * register access, then wait for BSY to clear
1792 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1796 ap
->ops
->dev_select(ap
, 1);
1797 if (ap
->flags
& ATA_FLAG_MMIO
) {
1798 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1799 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1801 nsect
= inb(ioaddr
->nsect_addr
);
1802 lbal
= inb(ioaddr
->lbal_addr
);
1804 if ((nsect
== 1) && (lbal
== 1))
1806 if (time_after(jiffies
, timeout
)) {
1810 msleep(50); /* give drive a breather */
1813 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1815 /* is all this really necessary? */
1816 ap
->ops
->dev_select(ap
, 0);
1818 ap
->ops
->dev_select(ap
, 1);
1820 ap
->ops
->dev_select(ap
, 0);
1824 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1825 * @ap: Port to reset and probe
1827 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1828 * probe the bus. Not often used these days.
1831 * PCI/etc. bus probe sem.
1832 * Obtains host_set lock.
1836 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1838 struct ata_taskfile tf
;
1839 unsigned long flags
;
1841 /* set up execute-device-diag (bus reset) taskfile */
1842 /* also, take interrupts to a known state (disabled) */
1843 DPRINTK("execute-device-diag\n");
1844 ata_tf_init(ap
, &tf
, 0);
1846 tf
.command
= ATA_CMD_EDD
;
1847 tf
.protocol
= ATA_PROT_NODATA
;
1850 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1851 ata_tf_to_host(ap
, &tf
);
1852 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1854 /* spec says at least 2ms. but who knows with those
1855 * crazy ATAPI devices...
1859 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1862 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1863 unsigned int devmask
)
1865 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1867 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1869 /* software reset. causes dev0 to be selected */
1870 if (ap
->flags
& ATA_FLAG_MMIO
) {
1871 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1872 udelay(20); /* FIXME: flush */
1873 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1874 udelay(20); /* FIXME: flush */
1875 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1877 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1879 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1881 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1884 /* spec mandates ">= 2ms" before checking status.
1885 * We wait 150ms, because that was the magic delay used for
1886 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1887 * between when the ATA command register is written, and then
1888 * status is checked. Because waiting for "a while" before
1889 * checking status is fine, post SRST, we perform this magic
1890 * delay here as well.
1894 ata_bus_post_reset(ap
, devmask
);
1900 * ata_bus_reset - reset host port and associated ATA channel
1901 * @ap: port to reset
1903 * This is typically the first time we actually start issuing
1904 * commands to the ATA channel. We wait for BSY to clear, then
1905 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1906 * result. Determine what devices, if any, are on the channel
1907 * by looking at the device 0/1 error register. Look at the signature
1908 * stored in each device's taskfile registers, to determine if
1909 * the device is ATA or ATAPI.
1912 * PCI/etc. bus probe sem.
1913 * Obtains host_set lock.
1916 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1919 void ata_bus_reset(struct ata_port
*ap
)
1921 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1922 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1924 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1926 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1928 /* determine if device 0/1 are present */
1929 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1932 dev0
= ata_devchk(ap
, 0);
1934 dev1
= ata_devchk(ap
, 1);
1938 devmask
|= (1 << 0);
1940 devmask
|= (1 << 1);
1942 /* select device 0 again */
1943 ap
->ops
->dev_select(ap
, 0);
1945 /* issue bus reset */
1946 if (ap
->flags
& ATA_FLAG_SRST
)
1947 rc
= ata_bus_softreset(ap
, devmask
);
1948 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1949 /* set up device control */
1950 if (ap
->flags
& ATA_FLAG_MMIO
)
1951 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1953 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1954 rc
= ata_bus_edd(ap
);
1961 * determine by signature whether we have ATA or ATAPI devices
1963 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
1964 if ((slave_possible
) && (err
!= 0x81))
1965 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
1967 /* re-enable interrupts */
1968 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1971 /* is double-select really necessary? */
1972 if (ap
->device
[1].class != ATA_DEV_NONE
)
1973 ap
->ops
->dev_select(ap
, 1);
1974 if (ap
->device
[0].class != ATA_DEV_NONE
)
1975 ap
->ops
->dev_select(ap
, 0);
1977 /* if no devices were detected, disable this port */
1978 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1979 (ap
->device
[1].class == ATA_DEV_NONE
))
1982 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
1983 /* set up device control for ATA_FLAG_SATA_RESET */
1984 if (ap
->flags
& ATA_FLAG_MMIO
)
1985 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1987 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1994 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
1995 ap
->ops
->port_disable(ap
);
2000 static int sata_phy_resume(struct ata_port
*ap
)
2002 unsigned long timeout
= jiffies
+ (HZ
* 5);
2005 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2007 /* Wait for phy to become ready, if necessary. */
2010 sstatus
= scr_read(ap
, SCR_STATUS
);
2011 if ((sstatus
& 0xf) != 1)
2013 } while (time_before(jiffies
, timeout
));
2019 * ata_std_probeinit - initialize probing
2020 * @ap: port to be probed
2022 * @ap is about to be probed. Initialize it. This function is
2023 * to be used as standard callback for ata_drive_probe_reset().
2025 * NOTE!!! Do not use this function as probeinit if a low level
2026 * driver implements only hardreset. Just pass NULL as probeinit
2027 * in that case. Using this function is probably okay but doing
2028 * so makes reset sequence different from the original
2029 * ->phy_reset implementation and Jeff nervous. :-P
2031 extern void ata_std_probeinit(struct ata_port
*ap
)
2033 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2034 sata_phy_resume(ap
);
2035 if (sata_dev_present(ap
))
2036 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2041 * ata_std_softreset - reset host port via ATA SRST
2042 * @ap: port to reset
2043 * @verbose: fail verbosely
2044 * @classes: resulting classes of attached devices
2046 * Reset host port using ATA SRST. This function is to be used
2047 * as standard callback for ata_drive_*_reset() functions.
2050 * Kernel thread context (may sleep)
2053 * 0 on success, -errno otherwise.
2055 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2057 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2058 unsigned int devmask
= 0, err_mask
;
2063 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2064 classes
[0] = ATA_DEV_NONE
;
2068 /* determine if device 0/1 are present */
2069 if (ata_devchk(ap
, 0))
2070 devmask
|= (1 << 0);
2071 if (slave_possible
&& ata_devchk(ap
, 1))
2072 devmask
|= (1 << 1);
2074 /* select device 0 again */
2075 ap
->ops
->dev_select(ap
, 0);
2077 /* issue bus reset */
2078 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2079 err_mask
= ata_bus_softreset(ap
, devmask
);
2082 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2085 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2090 /* determine by signature whether we have ATA or ATAPI devices */
2091 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2092 if (slave_possible
&& err
!= 0x81)
2093 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2096 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2101 * sata_std_hardreset - reset host port via SATA phy reset
2102 * @ap: port to reset
2103 * @verbose: fail verbosely
2104 * @class: resulting class of attached device
2106 * SATA phy-reset host port using DET bits of SControl register.
2107 * This function is to be used as standard callback for
2108 * ata_drive_*_reset().
2111 * Kernel thread context (may sleep)
2114 * 0 on success, -errno otherwise.
2116 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2120 /* Issue phy wake/reset */
2121 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2124 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2125 * 10.4.2 says at least 1 ms.
2129 /* Bring phy back */
2130 sata_phy_resume(ap
);
2132 /* TODO: phy layer with polling, timeouts, etc. */
2133 if (!sata_dev_present(ap
)) {
2134 *class = ATA_DEV_NONE
;
2135 DPRINTK("EXIT, link offline\n");
2139 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2141 printk(KERN_ERR
"ata%u: COMRESET failed "
2142 "(device not ready)\n", ap
->id
);
2144 DPRINTK("EXIT, device not ready\n");
2148 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2150 *class = ata_dev_try_classify(ap
, 0, NULL
);
2152 DPRINTK("EXIT, class=%u\n", *class);
2157 * ata_std_postreset - standard postreset callback
2158 * @ap: the target ata_port
2159 * @classes: classes of attached devices
2161 * This function is invoked after a successful reset. Note that
2162 * the device might have been reset more than once using
2163 * different reset methods before postreset is invoked.
2165 * This function is to be used as standard callback for
2166 * ata_drive_*_reset().
2169 * Kernel thread context (may sleep)
2171 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2175 /* set cable type if it isn't already set */
2176 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2177 ap
->cbl
= ATA_CBL_SATA
;
2179 /* print link status */
2180 if (ap
->cbl
== ATA_CBL_SATA
)
2181 sata_print_link_status(ap
);
2183 /* re-enable interrupts */
2184 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2187 /* is double-select really necessary? */
2188 if (classes
[0] != ATA_DEV_NONE
)
2189 ap
->ops
->dev_select(ap
, 1);
2190 if (classes
[1] != ATA_DEV_NONE
)
2191 ap
->ops
->dev_select(ap
, 0);
2193 /* bail out if no device is present */
2194 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2195 DPRINTK("EXIT, no device\n");
2199 /* set up device control */
2200 if (ap
->ioaddr
.ctl_addr
) {
2201 if (ap
->flags
& ATA_FLAG_MMIO
)
2202 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2204 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2211 * ata_std_probe_reset - standard probe reset method
2212 * @ap: prot to perform probe-reset
2213 * @classes: resulting classes of attached devices
2215 * The stock off-the-shelf ->probe_reset method.
2218 * Kernel thread context (may sleep)
2221 * 0 on success, -errno otherwise.
2223 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2225 ata_reset_fn_t hardreset
;
2228 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2229 hardreset
= sata_std_hardreset
;
2231 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2232 ata_std_softreset
, hardreset
,
2233 ata_std_postreset
, classes
);
2236 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2237 ata_postreset_fn_t postreset
,
2238 unsigned int *classes
)
2242 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2243 classes
[i
] = ATA_DEV_UNKNOWN
;
2245 rc
= reset(ap
, 0, classes
);
2249 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2250 * is complete and convert all ATA_DEV_UNKNOWN to
2253 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2254 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2257 if (i
< ATA_MAX_DEVICES
)
2258 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2259 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2260 classes
[i
] = ATA_DEV_NONE
;
2263 postreset(ap
, classes
);
2265 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2269 * ata_drive_probe_reset - Perform probe reset with given methods
2270 * @ap: port to reset
2271 * @probeinit: probeinit method (can be NULL)
2272 * @softreset: softreset method (can be NULL)
2273 * @hardreset: hardreset method (can be NULL)
2274 * @postreset: postreset method (can be NULL)
2275 * @classes: resulting classes of attached devices
2277 * Reset the specified port and classify attached devices using
2278 * given methods. This function prefers softreset but tries all
2279 * possible reset sequences to reset and classify devices. This
2280 * function is intended to be used for constructing ->probe_reset
2281 * callback by low level drivers.
2283 * Reset methods should follow the following rules.
2285 * - Return 0 on sucess, -errno on failure.
2286 * - If classification is supported, fill classes[] with
2287 * recognized class codes.
2288 * - If classification is not supported, leave classes[] alone.
2289 * - If verbose is non-zero, print error message on failure;
2290 * otherwise, shut up.
2293 * Kernel thread context (may sleep)
2296 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2297 * if classification fails, and any error code from reset
2300 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2301 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2302 ata_postreset_fn_t postreset
, unsigned int *classes
)
2310 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2318 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2319 if (rc
== 0 || rc
!= -ENODEV
)
2323 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2328 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2329 const struct ata_device
*dev
)
2331 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2332 ap
->id
, dev
->devno
);
2335 static const char * const ata_dma_blacklist
[] = {
2354 "Toshiba CD-ROM XM-6202B",
2355 "TOSHIBA CD-ROM XM-1702BC",
2357 "E-IDE CD-ROM CR-840",
2360 "SAMSUNG CD-ROM SC-148C",
2361 "SAMSUNG CD-ROM SC",
2363 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2367 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2369 unsigned char model_num
[41];
2372 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2374 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2375 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2381 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2383 const struct ata_device
*master
, *slave
;
2386 master
= &ap
->device
[0];
2387 slave
= &ap
->device
[1];
2389 WARN_ON(!ata_dev_present(master
) && !ata_dev_present(slave
));
2391 if (shift
== ATA_SHIFT_UDMA
) {
2392 mask
= ap
->udma_mask
;
2393 if (ata_dev_present(master
)) {
2394 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2395 if (ata_dma_blacklisted(master
)) {
2397 ata_pr_blacklisted(ap
, master
);
2400 if (ata_dev_present(slave
)) {
2401 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2402 if (ata_dma_blacklisted(slave
)) {
2404 ata_pr_blacklisted(ap
, slave
);
2408 else if (shift
== ATA_SHIFT_MWDMA
) {
2409 mask
= ap
->mwdma_mask
;
2410 if (ata_dev_present(master
)) {
2411 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2412 if (ata_dma_blacklisted(master
)) {
2414 ata_pr_blacklisted(ap
, master
);
2417 if (ata_dev_present(slave
)) {
2418 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2419 if (ata_dma_blacklisted(slave
)) {
2421 ata_pr_blacklisted(ap
, slave
);
2425 else if (shift
== ATA_SHIFT_PIO
) {
2426 mask
= ap
->pio_mask
;
2427 if (ata_dev_present(master
)) {
2428 /* spec doesn't return explicit support for
2429 * PIO0-2, so we fake it
2431 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2436 if (ata_dev_present(slave
)) {
2437 /* spec doesn't return explicit support for
2438 * PIO0-2, so we fake it
2440 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2447 mask
= 0xffffffff; /* shut up compiler warning */
2454 /* find greatest bit */
2455 static int fgb(u32 bitmap
)
2460 for (i
= 0; i
< 32; i
++)
2461 if (bitmap
& (1 << i
))
2468 * ata_choose_xfer_mode - attempt to find best transfer mode
2469 * @ap: Port for which an xfer mode will be selected
2470 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2471 * @xfer_shift_out: (output) bit shift that selects this mode
2473 * Based on host and device capabilities, determine the
2474 * maximum transfer mode that is amenable to all.
2477 * PCI/etc. bus probe sem.
2480 * Zero on success, negative on error.
2483 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2485 unsigned int *xfer_shift_out
)
2487 unsigned int mask
, shift
;
2490 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2491 shift
= xfer_mode_classes
[i
].shift
;
2492 mask
= ata_get_mode_mask(ap
, shift
);
2496 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2497 *xfer_shift_out
= shift
;
2506 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2507 * @ap: Port associated with device @dev
2508 * @dev: Device to which command will be sent
2510 * Issue SET FEATURES - XFER MODE command to device @dev
2514 * PCI/etc. bus probe sem.
2517 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2519 struct ata_taskfile tf
;
2521 /* set up set-features taskfile */
2522 DPRINTK("set features - xfer mode\n");
2524 ata_tf_init(ap
, &tf
, dev
->devno
);
2525 tf
.command
= ATA_CMD_SET_FEATURES
;
2526 tf
.feature
= SETFEATURES_XFER
;
2527 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2528 tf
.protocol
= ATA_PROT_NODATA
;
2529 tf
.nsect
= dev
->xfer_mode
;
2531 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2532 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2534 ata_port_disable(ap
);
2541 * ata_dev_init_params - Issue INIT DEV PARAMS command
2542 * @ap: Port associated with device @dev
2543 * @dev: Device to which command will be sent
2546 * Kernel thread context (may sleep)
2549 * 0 on success, AC_ERR_* mask otherwise.
2552 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2553 struct ata_device
*dev
)
2555 struct ata_taskfile tf
;
2556 unsigned int err_mask
;
2557 u16 sectors
= dev
->id
[6];
2558 u16 heads
= dev
->id
[3];
2560 /* Number of sectors per track 1-255. Number of heads 1-16 */
2561 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2564 /* set up init dev params taskfile */
2565 DPRINTK("init dev params \n");
2567 ata_tf_init(ap
, &tf
, dev
->devno
);
2568 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2569 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2570 tf
.protocol
= ATA_PROT_NODATA
;
2572 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2574 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2576 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2581 * ata_sg_clean - Unmap DMA memory associated with command
2582 * @qc: Command containing DMA memory to be released
2584 * Unmap all mapped DMA memory associated with this command.
2587 * spin_lock_irqsave(host_set lock)
2590 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2592 struct ata_port
*ap
= qc
->ap
;
2593 struct scatterlist
*sg
= qc
->__sg
;
2594 int dir
= qc
->dma_dir
;
2595 void *pad_buf
= NULL
;
2597 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2598 WARN_ON(sg
== NULL
);
2600 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2601 WARN_ON(qc
->n_elem
> 1);
2603 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2605 /* if we padded the buffer out to 32-bit bound, and data
2606 * xfer direction is from-device, we must copy from the
2607 * pad buffer back into the supplied buffer
2609 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2610 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2612 if (qc
->flags
& ATA_QCFLAG_SG
) {
2614 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2615 /* restore last sg */
2616 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2618 struct scatterlist
*psg
= &qc
->pad_sgent
;
2619 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2620 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2621 kunmap_atomic(addr
, KM_IRQ0
);
2625 dma_unmap_single(ap
->host_set
->dev
,
2626 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2629 sg
->length
+= qc
->pad_len
;
2631 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2632 pad_buf
, qc
->pad_len
);
2635 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2640 * ata_fill_sg - Fill PCI IDE PRD table
2641 * @qc: Metadata associated with taskfile to be transferred
2643 * Fill PCI IDE PRD (scatter-gather) table with segments
2644 * associated with the current disk command.
2647 * spin_lock_irqsave(host_set lock)
2650 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2652 struct ata_port
*ap
= qc
->ap
;
2653 struct scatterlist
*sg
;
2656 WARN_ON(qc
->__sg
== NULL
);
2657 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2660 ata_for_each_sg(sg
, qc
) {
2664 /* determine if physical DMA addr spans 64K boundary.
2665 * Note h/w doesn't support 64-bit, so we unconditionally
2666 * truncate dma_addr_t to u32.
2668 addr
= (u32
) sg_dma_address(sg
);
2669 sg_len
= sg_dma_len(sg
);
2672 offset
= addr
& 0xffff;
2674 if ((offset
+ sg_len
) > 0x10000)
2675 len
= 0x10000 - offset
;
2677 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2678 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2679 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2688 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2691 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2692 * @qc: Metadata associated with taskfile to check
2694 * Allow low-level driver to filter ATA PACKET commands, returning
2695 * a status indicating whether or not it is OK to use DMA for the
2696 * supplied PACKET command.
2699 * spin_lock_irqsave(host_set lock)
2701 * RETURNS: 0 when ATAPI DMA can be used
2704 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2706 struct ata_port
*ap
= qc
->ap
;
2707 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2709 if (ap
->ops
->check_atapi_dma
)
2710 rc
= ap
->ops
->check_atapi_dma(qc
);
2715 * ata_qc_prep - Prepare taskfile for submission
2716 * @qc: Metadata associated with taskfile to be prepared
2718 * Prepare ATA taskfile for submission.
2721 * spin_lock_irqsave(host_set lock)
2723 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2725 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2732 * ata_sg_init_one - Associate command with memory buffer
2733 * @qc: Command to be associated
2734 * @buf: Memory buffer
2735 * @buflen: Length of memory buffer, in bytes.
2737 * Initialize the data-related elements of queued_cmd @qc
2738 * to point to a single memory buffer, @buf of byte length @buflen.
2741 * spin_lock_irqsave(host_set lock)
2744 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2746 struct scatterlist
*sg
;
2748 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2750 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2751 qc
->__sg
= &qc
->sgent
;
2753 qc
->orig_n_elem
= 1;
2757 sg_init_one(sg
, buf
, buflen
);
2761 * ata_sg_init - Associate command with scatter-gather table.
2762 * @qc: Command to be associated
2763 * @sg: Scatter-gather table.
2764 * @n_elem: Number of elements in s/g table.
2766 * Initialize the data-related elements of queued_cmd @qc
2767 * to point to a scatter-gather table @sg, containing @n_elem
2771 * spin_lock_irqsave(host_set lock)
2774 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2775 unsigned int n_elem
)
2777 qc
->flags
|= ATA_QCFLAG_SG
;
2779 qc
->n_elem
= n_elem
;
2780 qc
->orig_n_elem
= n_elem
;
2784 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2785 * @qc: Command with memory buffer to be mapped.
2787 * DMA-map the memory buffer associated with queued_cmd @qc.
2790 * spin_lock_irqsave(host_set lock)
2793 * Zero on success, negative on error.
2796 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2798 struct ata_port
*ap
= qc
->ap
;
2799 int dir
= qc
->dma_dir
;
2800 struct scatterlist
*sg
= qc
->__sg
;
2801 dma_addr_t dma_address
;
2804 /* we must lengthen transfers to end on a 32-bit boundary */
2805 qc
->pad_len
= sg
->length
& 3;
2807 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2808 struct scatterlist
*psg
= &qc
->pad_sgent
;
2810 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2812 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2814 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2815 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2818 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2819 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2821 sg
->length
-= qc
->pad_len
;
2822 if (sg
->length
== 0)
2825 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2826 sg
->length
, qc
->pad_len
);
2834 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2836 if (dma_mapping_error(dma_address
)) {
2838 sg
->length
+= qc
->pad_len
;
2842 sg_dma_address(sg
) = dma_address
;
2843 sg_dma_len(sg
) = sg
->length
;
2846 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2847 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2853 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2854 * @qc: Command with scatter-gather table to be mapped.
2856 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2859 * spin_lock_irqsave(host_set lock)
2862 * Zero on success, negative on error.
2866 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2868 struct ata_port
*ap
= qc
->ap
;
2869 struct scatterlist
*sg
= qc
->__sg
;
2870 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2871 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2873 VPRINTK("ENTER, ata%u\n", ap
->id
);
2874 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
2876 /* we must lengthen transfers to end on a 32-bit boundary */
2877 qc
->pad_len
= lsg
->length
& 3;
2879 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2880 struct scatterlist
*psg
= &qc
->pad_sgent
;
2881 unsigned int offset
;
2883 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2885 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2888 * psg->page/offset are used to copy to-be-written
2889 * data in this function or read data in ata_sg_clean.
2891 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2892 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2893 psg
->offset
= offset_in_page(offset
);
2895 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2896 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2897 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2898 kunmap_atomic(addr
, KM_IRQ0
);
2901 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2902 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2904 lsg
->length
-= qc
->pad_len
;
2905 if (lsg
->length
== 0)
2908 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2909 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2912 pre_n_elem
= qc
->n_elem
;
2913 if (trim_sg
&& pre_n_elem
)
2922 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2924 /* restore last sg */
2925 lsg
->length
+= qc
->pad_len
;
2929 DPRINTK("%d sg elements mapped\n", n_elem
);
2932 qc
->n_elem
= n_elem
;
2938 * ata_poll_qc_complete - turn irq back on and finish qc
2939 * @qc: Command to complete
2940 * @err_mask: ATA status register content
2943 * None. (grabs host lock)
2946 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2948 struct ata_port
*ap
= qc
->ap
;
2949 unsigned long flags
;
2951 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2953 ata_qc_complete(qc
);
2954 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2958 * ata_pio_poll - poll using PIO, depending on current state
2959 * @ap: the target ata_port
2962 * None. (executing in kernel thread context)
2965 * timeout value to use
2968 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2970 struct ata_queued_cmd
*qc
;
2972 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2973 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2975 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2976 WARN_ON(qc
== NULL
);
2978 switch (ap
->hsm_task_state
) {
2981 poll_state
= HSM_ST_POLL
;
2985 case HSM_ST_LAST_POLL
:
2986 poll_state
= HSM_ST_LAST_POLL
;
2987 reg_state
= HSM_ST_LAST
;
2994 status
= ata_chk_status(ap
);
2995 if (status
& ATA_BUSY
) {
2996 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2997 qc
->err_mask
|= AC_ERR_TIMEOUT
;
2998 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3001 ap
->hsm_task_state
= poll_state
;
3002 return ATA_SHORT_PAUSE
;
3005 ap
->hsm_task_state
= reg_state
;
3010 * ata_pio_complete - check if drive is busy or idle
3011 * @ap: the target ata_port
3014 * None. (executing in kernel thread context)
3017 * Zero if qc completed.
3018 * Non-zero if has next.
3021 static int ata_pio_complete (struct ata_port
*ap
)
3023 struct ata_queued_cmd
*qc
;
3027 * This is purely heuristic. This is a fast path. Sometimes when
3028 * we enter, BSY will be cleared in a chk-status or two. If not,
3029 * the drive is probably seeking or something. Snooze for a couple
3030 * msecs, then chk-status again. If still busy, fall back to
3031 * HSM_ST_LAST_POLL state.
3033 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3034 if (drv_stat
& ATA_BUSY
) {
3036 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3037 if (drv_stat
& ATA_BUSY
) {
3038 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3039 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3044 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3045 WARN_ON(qc
== NULL
);
3047 drv_stat
= ata_wait_idle(ap
);
3048 if (!ata_ok(drv_stat
)) {
3049 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3050 ap
->hsm_task_state
= HSM_ST_ERR
;
3054 ap
->hsm_task_state
= HSM_ST_IDLE
;
3056 WARN_ON(qc
->err_mask
);
3057 ata_poll_qc_complete(qc
);
3059 /* another command may start at this point */
3066 * swap_buf_le16 - swap halves of 16-bit words in place
3067 * @buf: Buffer to swap
3068 * @buf_words: Number of 16-bit words in buffer.
3070 * Swap halves of 16-bit words if needed to convert from
3071 * little-endian byte order to native cpu byte order, or
3075 * Inherited from caller.
3077 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3082 for (i
= 0; i
< buf_words
; i
++)
3083 buf
[i
] = le16_to_cpu(buf
[i
]);
3084 #endif /* __BIG_ENDIAN */
3088 * ata_mmio_data_xfer - Transfer data by MMIO
3089 * @ap: port to read/write
3091 * @buflen: buffer length
3092 * @write_data: read/write
3094 * Transfer data from/to the device data register by MMIO.
3097 * Inherited from caller.
3100 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3101 unsigned int buflen
, int write_data
)
3104 unsigned int words
= buflen
>> 1;
3105 u16
*buf16
= (u16
*) buf
;
3106 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3108 /* Transfer multiple of 2 bytes */
3110 for (i
= 0; i
< words
; i
++)
3111 writew(le16_to_cpu(buf16
[i
]), mmio
);
3113 for (i
= 0; i
< words
; i
++)
3114 buf16
[i
] = cpu_to_le16(readw(mmio
));
3117 /* Transfer trailing 1 byte, if any. */
3118 if (unlikely(buflen
& 0x01)) {
3119 u16 align_buf
[1] = { 0 };
3120 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3123 memcpy(align_buf
, trailing_buf
, 1);
3124 writew(le16_to_cpu(align_buf
[0]), mmio
);
3126 align_buf
[0] = cpu_to_le16(readw(mmio
));
3127 memcpy(trailing_buf
, align_buf
, 1);
3133 * ata_pio_data_xfer - Transfer data by PIO
3134 * @ap: port to read/write
3136 * @buflen: buffer length
3137 * @write_data: read/write
3139 * Transfer data from/to the device data register by PIO.
3142 * Inherited from caller.
3145 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3146 unsigned int buflen
, int write_data
)
3148 unsigned int words
= buflen
>> 1;
3150 /* Transfer multiple of 2 bytes */
3152 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3154 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3156 /* Transfer trailing 1 byte, if any. */
3157 if (unlikely(buflen
& 0x01)) {
3158 u16 align_buf
[1] = { 0 };
3159 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3162 memcpy(align_buf
, trailing_buf
, 1);
3163 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3165 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3166 memcpy(trailing_buf
, align_buf
, 1);
3172 * ata_data_xfer - Transfer data from/to the data register.
3173 * @ap: port to read/write
3175 * @buflen: buffer length
3176 * @do_write: read/write
3178 * Transfer data from/to the device data register.
3181 * Inherited from caller.
3184 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3185 unsigned int buflen
, int do_write
)
3187 /* Make the crap hardware pay the costs not the good stuff */
3188 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3189 unsigned long flags
;
3190 local_irq_save(flags
);
3191 if (ap
->flags
& ATA_FLAG_MMIO
)
3192 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3194 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3195 local_irq_restore(flags
);
3197 if (ap
->flags
& ATA_FLAG_MMIO
)
3198 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3200 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3205 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3206 * @qc: Command on going
3208 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3211 * Inherited from caller.
3214 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3216 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3217 struct scatterlist
*sg
= qc
->__sg
;
3218 struct ata_port
*ap
= qc
->ap
;
3220 unsigned int offset
;
3223 if (qc
->cursect
== (qc
->nsect
- 1))
3224 ap
->hsm_task_state
= HSM_ST_LAST
;
3226 page
= sg
[qc
->cursg
].page
;
3227 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3229 /* get the current page and offset */
3230 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3231 offset
%= PAGE_SIZE
;
3233 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3235 if (PageHighMem(page
)) {
3236 unsigned long flags
;
3238 local_irq_save(flags
);
3239 buf
= kmap_atomic(page
, KM_IRQ0
);
3241 /* do the actual data transfer */
3242 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3244 kunmap_atomic(buf
, KM_IRQ0
);
3245 local_irq_restore(flags
);
3247 buf
= page_address(page
);
3248 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3254 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3261 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3262 * @qc: Command on going
3264 * Transfer one or many ATA_SECT_SIZE of data from/to the
3265 * ATA device for the DRQ request.
3268 * Inherited from caller.
3271 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3273 if (is_multi_taskfile(&qc
->tf
)) {
3274 /* READ/WRITE MULTIPLE */
3277 WARN_ON(qc
->dev
->multi_count
== 0);
3279 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3287 * atapi_send_cdb - Write CDB bytes to hardware
3288 * @ap: Port to which ATAPI device is attached.
3289 * @qc: Taskfile currently active
3291 * When device has indicated its readiness to accept
3292 * a CDB, this function is called. Send the CDB.
3298 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3301 DPRINTK("send cdb\n");
3302 WARN_ON(qc
->dev
->cdb_len
< 12);
3304 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3305 ata_altstatus(ap
); /* flush */
3307 switch (qc
->tf
.protocol
) {
3308 case ATA_PROT_ATAPI
:
3309 ap
->hsm_task_state
= HSM_ST
;
3311 case ATA_PROT_ATAPI_NODATA
:
3312 ap
->hsm_task_state
= HSM_ST_LAST
;
3314 case ATA_PROT_ATAPI_DMA
:
3315 ap
->hsm_task_state
= HSM_ST_LAST
;
3316 /* initiate bmdma */
3317 ap
->ops
->bmdma_start(qc
);
3323 * ata_pio_first_block - Write first data block to hardware
3324 * @ap: Port to which ATA/ATAPI device is attached.
3326 * When device has indicated its readiness to accept
3327 * the data, this function sends out the CDB or
3328 * the first data block by PIO.
3330 * - If polling, ata_pio_task() handles the rest.
3331 * - Otherwise, interrupt handler takes over.
3334 * Kernel thread context (may sleep)
3337 * Zero if irq handler takes over
3338 * Non-zero if has next (polling).
3341 static int ata_pio_first_block(struct ata_port
*ap
)
3343 struct ata_queued_cmd
*qc
;
3345 unsigned long flags
;
3348 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3349 WARN_ON(qc
== NULL
);
3350 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3352 /* if polling, we will stay in the work queue after sending the data.
3353 * otherwise, interrupt handler takes over after sending the data.
3355 has_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3357 /* sleep-wait for BSY to clear */
3358 DPRINTK("busy wait\n");
3359 if (ata_busy_sleep(ap
, ATA_TMOUT_DATAOUT_QUICK
, ATA_TMOUT_DATAOUT
)) {
3360 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3361 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3365 /* make sure DRQ is set */
3366 status
= ata_chk_status(ap
);
3367 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3368 /* device status error */
3369 qc
->err_mask
|= AC_ERR_HSM
;
3370 ap
->hsm_task_state
= HSM_ST_ERR
;
3374 /* Send the CDB (atapi) or the first data block (ata pio out).
3375 * During the state transition, interrupt handler shouldn't
3376 * be invoked before the data transfer is complete and
3377 * hsm_task_state is changed. Hence, the following locking.
3379 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3381 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
3382 /* PIO data out protocol.
3383 * send first data block.
3386 /* ata_pio_sectors() might change the state to HSM_ST_LAST.
3387 * so, the state is changed here before ata_pio_sectors().
3389 ap
->hsm_task_state
= HSM_ST
;
3390 ata_pio_sectors(qc
);
3391 ata_altstatus(ap
); /* flush */
3394 atapi_send_cdb(ap
, qc
);
3396 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3398 /* if polling, ata_pio_task() handles the rest.
3399 * otherwise, interrupt handler takes over from here.
3404 return 1; /* has next */
3408 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3409 * @qc: Command on going
3410 * @bytes: number of bytes
3412 * Transfer Transfer data from/to the ATAPI device.
3415 * Inherited from caller.
3419 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3421 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3422 struct scatterlist
*sg
= qc
->__sg
;
3423 struct ata_port
*ap
= qc
->ap
;
3426 unsigned int offset
, count
;
3428 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3429 ap
->hsm_task_state
= HSM_ST_LAST
;
3432 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3434 * The end of qc->sg is reached and the device expects
3435 * more data to transfer. In order not to overrun qc->sg
3436 * and fulfill length specified in the byte count register,
3437 * - for read case, discard trailing data from the device
3438 * - for write case, padding zero data to the device
3440 u16 pad_buf
[1] = { 0 };
3441 unsigned int words
= bytes
>> 1;
3444 if (words
) /* warning if bytes > 1 */
3445 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3448 for (i
= 0; i
< words
; i
++)
3449 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3451 ap
->hsm_task_state
= HSM_ST_LAST
;
3455 sg
= &qc
->__sg
[qc
->cursg
];
3458 offset
= sg
->offset
+ qc
->cursg_ofs
;
3460 /* get the current page and offset */
3461 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3462 offset
%= PAGE_SIZE
;
3464 /* don't overrun current sg */
3465 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3467 /* don't cross page boundaries */
3468 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3470 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3472 if (PageHighMem(page
)) {
3473 unsigned long flags
;
3475 local_irq_save(flags
);
3476 buf
= kmap_atomic(page
, KM_IRQ0
);
3478 /* do the actual data transfer */
3479 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3481 kunmap_atomic(buf
, KM_IRQ0
);
3482 local_irq_restore(flags
);
3484 buf
= page_address(page
);
3485 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3489 qc
->curbytes
+= count
;
3490 qc
->cursg_ofs
+= count
;
3492 if (qc
->cursg_ofs
== sg
->length
) {
3502 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3503 * @qc: Command on going
3505 * Transfer Transfer data from/to the ATAPI device.
3508 * Inherited from caller.
3511 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3513 struct ata_port
*ap
= qc
->ap
;
3514 struct ata_device
*dev
= qc
->dev
;
3515 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3516 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3518 ap
->ops
->tf_read(ap
, &qc
->tf
);
3519 ireason
= qc
->tf
.nsect
;
3520 bc_lo
= qc
->tf
.lbam
;
3521 bc_hi
= qc
->tf
.lbah
;
3522 bytes
= (bc_hi
<< 8) | bc_lo
;
3524 /* shall be cleared to zero, indicating xfer of data */
3525 if (ireason
& (1 << 0))
3528 /* make sure transfer direction matches expected */
3529 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3530 if (do_write
!= i_write
)
3533 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3535 __atapi_pio_bytes(qc
, bytes
);
3540 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3541 ap
->id
, dev
->devno
);
3542 qc
->err_mask
|= AC_ERR_HSM
;
3543 ap
->hsm_task_state
= HSM_ST_ERR
;
3547 * ata_pio_block - start PIO on a block
3548 * @ap: the target ata_port
3551 * None. (executing in kernel thread context)
3554 static void ata_pio_block(struct ata_port
*ap
)
3556 struct ata_queued_cmd
*qc
;
3560 * This is purely heuristic. This is a fast path.
3561 * Sometimes when we enter, BSY will be cleared in
3562 * a chk-status or two. If not, the drive is probably seeking
3563 * or something. Snooze for a couple msecs, then
3564 * chk-status again. If still busy, fall back to
3565 * HSM_ST_POLL state.
3567 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3568 if (status
& ATA_BUSY
) {
3570 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3571 if (status
& ATA_BUSY
) {
3572 ap
->hsm_task_state
= HSM_ST_POLL
;
3573 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3578 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3579 WARN_ON(qc
== NULL
);
3582 if (status
& (ATA_ERR
| ATA_DF
)) {
3583 qc
->err_mask
|= AC_ERR_DEV
;
3584 ap
->hsm_task_state
= HSM_ST_ERR
;
3588 /* transfer data if any */
3589 if (is_atapi_taskfile(&qc
->tf
)) {
3590 /* DRQ=0 means no more data to transfer */
3591 if ((status
& ATA_DRQ
) == 0) {
3592 ap
->hsm_task_state
= HSM_ST_LAST
;
3596 atapi_pio_bytes(qc
);
3598 /* handle BSY=0, DRQ=0 as error */
3599 if ((status
& ATA_DRQ
) == 0) {
3600 qc
->err_mask
|= AC_ERR_HSM
;
3601 ap
->hsm_task_state
= HSM_ST_ERR
;
3605 ata_pio_sectors(qc
);
3608 ata_altstatus(ap
); /* flush */
3611 static void ata_pio_error(struct ata_port
*ap
)
3613 struct ata_queued_cmd
*qc
;
3615 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3616 WARN_ON(qc
== NULL
);
3618 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3619 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3621 /* make sure qc->err_mask is available to
3622 * know what's wrong and recover
3624 WARN_ON(qc
->err_mask
== 0);
3626 ap
->hsm_task_state
= HSM_ST_IDLE
;
3628 ata_poll_qc_complete(qc
);
3631 static void ata_pio_task(void *_data
)
3633 struct ata_port
*ap
= _data
;
3634 unsigned long timeout
;
3641 switch (ap
->hsm_task_state
) {
3643 has_next
= ata_pio_first_block(ap
);
3651 has_next
= ata_pio_complete(ap
);
3655 case HSM_ST_LAST_POLL
:
3656 timeout
= ata_pio_poll(ap
);
3670 ata_queue_delayed_pio_task(ap
, timeout
);
3676 * ata_qc_timeout - Handle timeout of queued command
3677 * @qc: Command that timed out
3679 * Some part of the kernel (currently, only the SCSI layer)
3680 * has noticed that the active command on port @ap has not
3681 * completed after a specified length of time. Handle this
3682 * condition by disabling DMA (if necessary) and completing
3683 * transactions, with error if necessary.
3685 * This also handles the case of the "lost interrupt", where
3686 * for some reason (possibly hardware bug, possibly driver bug)
3687 * an interrupt was not delivered to the driver, even though the
3688 * transaction completed successfully.
3691 * Inherited from SCSI layer (none, can sleep)
3694 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3696 struct ata_port
*ap
= qc
->ap
;
3697 struct ata_host_set
*host_set
= ap
->host_set
;
3698 u8 host_stat
= 0, drv_stat
;
3699 unsigned long flags
;
3703 ata_flush_pio_tasks(ap
);
3704 ap
->hsm_task_state
= HSM_ST_IDLE
;
3706 spin_lock_irqsave(&host_set
->lock
, flags
);
3708 switch (qc
->tf
.protocol
) {
3711 case ATA_PROT_ATAPI_DMA
:
3712 host_stat
= ap
->ops
->bmdma_status(ap
);
3714 /* before we do anything else, clear DMA-Start bit */
3715 ap
->ops
->bmdma_stop(qc
);
3721 drv_stat
= ata_chk_status(ap
);
3723 /* ack bmdma irq events */
3724 ap
->ops
->irq_clear(ap
);
3726 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3727 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3729 ap
->hsm_task_state
= HSM_ST_IDLE
;
3731 /* complete taskfile transaction */
3732 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3736 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3738 ata_eh_qc_complete(qc
);
3744 * ata_eng_timeout - Handle timeout of queued command
3745 * @ap: Port on which timed-out command is active
3747 * Some part of the kernel (currently, only the SCSI layer)
3748 * has noticed that the active command on port @ap has not
3749 * completed after a specified length of time. Handle this
3750 * condition by disabling DMA (if necessary) and completing
3751 * transactions, with error if necessary.
3753 * This also handles the case of the "lost interrupt", where
3754 * for some reason (possibly hardware bug, possibly driver bug)
3755 * an interrupt was not delivered to the driver, even though the
3756 * transaction completed successfully.
3759 * Inherited from SCSI layer (none, can sleep)
3762 void ata_eng_timeout(struct ata_port
*ap
)
3766 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3772 * ata_qc_new - Request an available ATA command, for queueing
3773 * @ap: Port associated with device @dev
3774 * @dev: Device from whom we request an available command structure
3780 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3782 struct ata_queued_cmd
*qc
= NULL
;
3785 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3786 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3787 qc
= ata_qc_from_tag(ap
, i
);
3798 * ata_qc_new_init - Request an available ATA command, and initialize it
3799 * @ap: Port associated with device @dev
3800 * @dev: Device from whom we request an available command structure
3806 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3807 struct ata_device
*dev
)
3809 struct ata_queued_cmd
*qc
;
3811 qc
= ata_qc_new(ap
);
3824 * ata_qc_free - free unused ata_queued_cmd
3825 * @qc: Command to complete
3827 * Designed to free unused ata_queued_cmd object
3828 * in case something prevents using it.
3831 * spin_lock_irqsave(host_set lock)
3833 void ata_qc_free(struct ata_queued_cmd
*qc
)
3835 struct ata_port
*ap
= qc
->ap
;
3838 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3842 if (likely(ata_tag_valid(tag
))) {
3843 if (tag
== ap
->active_tag
)
3844 ap
->active_tag
= ATA_TAG_POISON
;
3845 qc
->tag
= ATA_TAG_POISON
;
3846 clear_bit(tag
, &ap
->qactive
);
3850 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3852 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3853 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3855 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3858 /* atapi: mark qc as inactive to prevent the interrupt handler
3859 * from completing the command twice later, before the error handler
3860 * is called. (when rc != 0 and atapi request sense is needed)
3862 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3864 /* call completion callback */
3865 qc
->complete_fn(qc
);
3868 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3870 struct ata_port
*ap
= qc
->ap
;
3872 switch (qc
->tf
.protocol
) {
3874 case ATA_PROT_ATAPI_DMA
:
3877 case ATA_PROT_ATAPI
:
3879 case ATA_PROT_PIO_MULT
:
3880 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3893 * ata_qc_issue - issue taskfile to device
3894 * @qc: command to issue to device
3896 * Prepare an ATA command to submission to device.
3897 * This includes mapping the data into a DMA-able
3898 * area, filling in the S/G table, and finally
3899 * writing the taskfile to hardware, starting the command.
3902 * spin_lock_irqsave(host_set lock)
3905 * Zero on success, AC_ERR_* mask on failure
3908 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3910 struct ata_port
*ap
= qc
->ap
;
3912 if (ata_should_dma_map(qc
)) {
3913 if (qc
->flags
& ATA_QCFLAG_SG
) {
3914 if (ata_sg_setup(qc
))
3916 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3917 if (ata_sg_setup_one(qc
))
3921 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3924 ap
->ops
->qc_prep(qc
);
3926 qc
->ap
->active_tag
= qc
->tag
;
3927 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3929 return ap
->ops
->qc_issue(qc
);
3932 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3933 return AC_ERR_SYSTEM
;
3938 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3939 * @qc: command to issue to device
3941 * Using various libata functions and hooks, this function
3942 * starts an ATA command. ATA commands are grouped into
3943 * classes called "protocols", and issuing each type of protocol
3944 * is slightly different.
3946 * May be used as the qc_issue() entry in ata_port_operations.
3949 * spin_lock_irqsave(host_set lock)
3952 * Zero on success, AC_ERR_* mask on failure
3955 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3957 struct ata_port
*ap
= qc
->ap
;
3959 /* Use polling pio if the LLD doesn't handle
3960 * interrupt driven pio and atapi CDB interrupt.
3962 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
3963 switch (qc
->tf
.protocol
) {
3965 case ATA_PROT_ATAPI
:
3966 case ATA_PROT_ATAPI_NODATA
:
3967 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
3969 case ATA_PROT_ATAPI_DMA
:
3970 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
3978 /* select the device */
3979 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3981 /* start the command */
3982 switch (qc
->tf
.protocol
) {
3983 case ATA_PROT_NODATA
:
3984 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3985 ata_qc_set_polling(qc
);
3987 ata_tf_to_host(ap
, &qc
->tf
);
3988 ap
->hsm_task_state
= HSM_ST_LAST
;
3990 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3991 ata_queue_pio_task(ap
);
3996 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3998 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3999 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4000 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4001 ap
->hsm_task_state
= HSM_ST_LAST
;
4005 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4006 ata_qc_set_polling(qc
);
4008 ata_tf_to_host(ap
, &qc
->tf
);
4010 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4011 /* PIO data out protocol */
4012 ap
->hsm_task_state
= HSM_ST_FIRST
;
4013 ata_queue_pio_task(ap
);
4015 /* always send first data block using
4016 * the ata_pio_task() codepath.
4019 /* PIO data in protocol */
4020 ap
->hsm_task_state
= HSM_ST
;
4022 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4023 ata_queue_pio_task(ap
);
4025 /* if polling, ata_pio_task() handles the rest.
4026 * otherwise, interrupt handler takes over from here.
4032 case ATA_PROT_ATAPI
:
4033 case ATA_PROT_ATAPI_NODATA
:
4034 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4035 ata_qc_set_polling(qc
);
4037 ata_tf_to_host(ap
, &qc
->tf
);
4039 ap
->hsm_task_state
= HSM_ST_FIRST
;
4041 /* send cdb by polling if no cdb interrupt */
4042 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4043 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4044 ata_queue_pio_task(ap
);
4047 case ATA_PROT_ATAPI_DMA
:
4048 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4050 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4051 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4052 ap
->hsm_task_state
= HSM_ST_FIRST
;
4054 /* send cdb by polling if no cdb interrupt */
4055 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4056 ata_queue_pio_task(ap
);
4061 return AC_ERR_SYSTEM
;
4068 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4069 * @qc: Info associated with this ATA transaction.
4072 * spin_lock_irqsave(host_set lock)
4075 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
4077 struct ata_port
*ap
= qc
->ap
;
4078 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4080 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4082 /* load PRD table addr. */
4083 mb(); /* make sure PRD table writes are visible to controller */
4084 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
4086 /* specify data direction, triple-check start bit is clear */
4087 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4088 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4090 dmactl
|= ATA_DMA_WR
;
4091 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
4093 /* issue r/w command */
4094 ap
->ops
->exec_command(ap
, &qc
->tf
);
4098 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4099 * @qc: Info associated with this ATA transaction.
4102 * spin_lock_irqsave(host_set lock)
4105 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4107 struct ata_port
*ap
= qc
->ap
;
4108 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4111 /* start host DMA transaction */
4112 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4113 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4115 /* Strictly, one may wish to issue a readb() here, to
4116 * flush the mmio write. However, control also passes
4117 * to the hardware at this point, and it will interrupt
4118 * us when we are to resume control. So, in effect,
4119 * we don't care when the mmio write flushes.
4120 * Further, a read of the DMA status register _immediately_
4121 * following the write may not be what certain flaky hardware
4122 * is expected, so I think it is best to not add a readb()
4123 * without first all the MMIO ATA cards/mobos.
4124 * Or maybe I'm just being paranoid.
4129 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4130 * @qc: Info associated with this ATA transaction.
4133 * spin_lock_irqsave(host_set lock)
4136 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4138 struct ata_port
*ap
= qc
->ap
;
4139 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4142 /* load PRD table addr. */
4143 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4145 /* specify data direction, triple-check start bit is clear */
4146 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4147 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4149 dmactl
|= ATA_DMA_WR
;
4150 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4152 /* issue r/w command */
4153 ap
->ops
->exec_command(ap
, &qc
->tf
);
4157 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4158 * @qc: Info associated with this ATA transaction.
4161 * spin_lock_irqsave(host_set lock)
4164 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4166 struct ata_port
*ap
= qc
->ap
;
4169 /* start host DMA transaction */
4170 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4171 outb(dmactl
| ATA_DMA_START
,
4172 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4177 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4178 * @qc: Info associated with this ATA transaction.
4180 * Writes the ATA_DMA_START flag to the DMA command register.
4182 * May be used as the bmdma_start() entry in ata_port_operations.
4185 * spin_lock_irqsave(host_set lock)
4187 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4189 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4190 ata_bmdma_start_mmio(qc
);
4192 ata_bmdma_start_pio(qc
);
4197 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4198 * @qc: Info associated with this ATA transaction.
4200 * Writes address of PRD table to device's PRD Table Address
4201 * register, sets the DMA control register, and calls
4202 * ops->exec_command() to start the transfer.
4204 * May be used as the bmdma_setup() entry in ata_port_operations.
4207 * spin_lock_irqsave(host_set lock)
4209 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4211 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4212 ata_bmdma_setup_mmio(qc
);
4214 ata_bmdma_setup_pio(qc
);
4219 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4220 * @ap: Port associated with this ATA transaction.
4222 * Clear interrupt and error flags in DMA status register.
4224 * May be used as the irq_clear() entry in ata_port_operations.
4227 * spin_lock_irqsave(host_set lock)
4230 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4232 if (ap
->flags
& ATA_FLAG_MMIO
) {
4233 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4234 writeb(readb(mmio
), mmio
);
4236 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4237 outb(inb(addr
), addr
);
4244 * ata_bmdma_status - Read PCI IDE BMDMA status
4245 * @ap: Port associated with this ATA transaction.
4247 * Read and return BMDMA status register.
4249 * May be used as the bmdma_status() entry in ata_port_operations.
4252 * spin_lock_irqsave(host_set lock)
4255 u8
ata_bmdma_status(struct ata_port
*ap
)
4258 if (ap
->flags
& ATA_FLAG_MMIO
) {
4259 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4260 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4262 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4268 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4269 * @qc: Command we are ending DMA for
4271 * Clears the ATA_DMA_START flag in the dma control register
4273 * May be used as the bmdma_stop() entry in ata_port_operations.
4276 * spin_lock_irqsave(host_set lock)
4279 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4281 struct ata_port
*ap
= qc
->ap
;
4282 if (ap
->flags
& ATA_FLAG_MMIO
) {
4283 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4285 /* clear start/stop bit */
4286 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4287 mmio
+ ATA_DMA_CMD
);
4289 /* clear start/stop bit */
4290 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4291 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4294 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4295 ata_altstatus(ap
); /* dummy read */
4299 * ata_host_intr - Handle host interrupt for given (port, task)
4300 * @ap: Port on which interrupt arrived (possibly...)
4301 * @qc: Taskfile currently active in engine
4303 * Handle host interrupt for given queued command. Currently,
4304 * only DMA interrupts are handled. All other commands are
4305 * handled via polling with interrupts disabled (nIEN bit).
4308 * spin_lock_irqsave(host_set lock)
4311 * One if interrupt was handled, zero if not (shared irq).
4314 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4315 struct ata_queued_cmd
*qc
)
4317 u8 status
, host_stat
= 0;
4319 VPRINTK("ata%u: protocol %d task_state %d\n",
4320 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4322 /* Check whether we are expecting interrupt in this state */
4323 switch (ap
->hsm_task_state
) {
4325 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4326 * The flag was turned on only for atapi devices.
4327 * No need to check is_atapi_taskfile(&qc->tf) again.
4329 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4333 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4334 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4335 /* check status of DMA engine */
4336 host_stat
= ap
->ops
->bmdma_status(ap
);
4337 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4339 /* if it's not our irq... */
4340 if (!(host_stat
& ATA_DMA_INTR
))
4343 /* before we do anything else, clear DMA-Start bit */
4344 ap
->ops
->bmdma_stop(qc
);
4346 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4347 /* error when transfering data to/from memory */
4348 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4349 ap
->hsm_task_state
= HSM_ST_ERR
;
4359 /* check altstatus */
4360 status
= ata_altstatus(ap
);
4361 if (status
& ATA_BUSY
)
4364 /* check main status, clearing INTRQ */
4365 status
= ata_chk_status(ap
);
4366 if (unlikely(status
& ATA_BUSY
))
4369 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4370 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4372 /* ack bmdma irq events */
4373 ap
->ops
->irq_clear(ap
);
4376 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4377 qc
->err_mask
|= AC_ERR_DEV
;
4378 ap
->hsm_task_state
= HSM_ST_ERR
;
4382 switch (ap
->hsm_task_state
) {
4384 /* Some pre-ATAPI-4 devices assert INTRQ
4385 * at this state when ready to receive CDB.
4388 /* check device status */
4389 if (unlikely((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)) {
4390 /* Wrong status. Let EH handle this */
4391 qc
->err_mask
|= AC_ERR_HSM
;
4392 ap
->hsm_task_state
= HSM_ST_ERR
;
4396 atapi_send_cdb(ap
, qc
);
4401 /* complete command or read/write the data register */
4402 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4403 /* ATAPI PIO protocol */
4404 if ((status
& ATA_DRQ
) == 0) {
4405 /* no more data to transfer */
4406 ap
->hsm_task_state
= HSM_ST_LAST
;
4410 atapi_pio_bytes(qc
);
4412 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4413 /* bad ireason reported by device */
4417 /* ATA PIO protocol */
4418 if (unlikely((status
& ATA_DRQ
) == 0)) {
4419 /* handle BSY=0, DRQ=0 as error */
4420 qc
->err_mask
|= AC_ERR_HSM
;
4421 ap
->hsm_task_state
= HSM_ST_ERR
;
4425 ata_pio_sectors(qc
);
4427 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4428 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4431 status
= ata_chk_status(ap
);
4436 ata_altstatus(ap
); /* flush */
4440 if (unlikely(status
& ATA_DRQ
)) {
4441 /* handle DRQ=1 as error */
4442 qc
->err_mask
|= AC_ERR_HSM
;
4443 ap
->hsm_task_state
= HSM_ST_ERR
;
4447 /* no more data to transfer */
4448 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
4451 ap
->hsm_task_state
= HSM_ST_IDLE
;
4453 /* complete taskfile transaction */
4454 qc
->err_mask
|= ac_err_mask(status
);
4455 ata_qc_complete(qc
);
4459 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
4460 printk(KERN_ERR
"ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
4461 ap
->id
, status
, host_stat
);
4463 /* make sure qc->err_mask is available to
4464 * know what's wrong and recover
4466 WARN_ON(qc
->err_mask
== 0);
4468 ap
->hsm_task_state
= HSM_ST_IDLE
;
4469 ata_qc_complete(qc
);
4475 return 1; /* irq handled */
4478 ap
->stats
.idle_irq
++;
4481 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4483 ata_irq_ack(ap
, 0); /* debug trap */
4484 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4487 return 0; /* irq not handled */
4491 * ata_interrupt - Default ATA host interrupt handler
4492 * @irq: irq line (unused)
4493 * @dev_instance: pointer to our ata_host_set information structure
4496 * Default interrupt handler for PCI IDE devices. Calls
4497 * ata_host_intr() for each port that is not disabled.
4500 * Obtains host_set lock during operation.
4503 * IRQ_NONE or IRQ_HANDLED.
4506 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4508 struct ata_host_set
*host_set
= dev_instance
;
4510 unsigned int handled
= 0;
4511 unsigned long flags
;
4513 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4514 spin_lock_irqsave(&host_set
->lock
, flags
);
4516 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4517 struct ata_port
*ap
;
4519 ap
= host_set
->ports
[i
];
4521 !(ap
->flags
& ATA_FLAG_PORT_DISABLED
)) {
4522 struct ata_queued_cmd
*qc
;
4524 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4525 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4526 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4527 handled
|= ata_host_intr(ap
, qc
);
4531 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4533 return IRQ_RETVAL(handled
);
4537 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4538 * without filling any other registers
4540 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4543 struct ata_taskfile tf
;
4546 ata_tf_init(ap
, &tf
, dev
->devno
);
4549 tf
.flags
|= ATA_TFLAG_DEVICE
;
4550 tf
.protocol
= ATA_PROT_NODATA
;
4552 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4554 printk(KERN_ERR
"%s: ata command failed: %d\n",
4560 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4564 if (!ata_try_flush_cache(dev
))
4567 if (ata_id_has_flush_ext(dev
->id
))
4568 cmd
= ATA_CMD_FLUSH_EXT
;
4570 cmd
= ATA_CMD_FLUSH
;
4572 return ata_do_simple_cmd(ap
, dev
, cmd
);
4575 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4577 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4580 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4582 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4586 * ata_device_resume - wakeup a previously suspended devices
4587 * @ap: port the device is connected to
4588 * @dev: the device to resume
4590 * Kick the drive back into action, by sending it an idle immediate
4591 * command and making sure its transfer mode matches between drive
4595 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4597 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4598 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4601 if (!ata_dev_present(dev
))
4603 if (dev
->class == ATA_DEV_ATA
)
4604 ata_start_drive(ap
, dev
);
4610 * ata_device_suspend - prepare a device for suspend
4611 * @ap: port the device is connected to
4612 * @dev: the device to suspend
4614 * Flush the cache on the drive, if appropriate, then issue a
4615 * standbynow command.
4617 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4619 if (!ata_dev_present(dev
))
4621 if (dev
->class == ATA_DEV_ATA
)
4622 ata_flush_cache(ap
, dev
);
4624 ata_standby_drive(ap
, dev
);
4625 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4630 * ata_port_start - Set port up for dma.
4631 * @ap: Port to initialize
4633 * Called just after data structures for each port are
4634 * initialized. Allocates space for PRD table.
4636 * May be used as the port_start() entry in ata_port_operations.
4639 * Inherited from caller.
4642 int ata_port_start (struct ata_port
*ap
)
4644 struct device
*dev
= ap
->host_set
->dev
;
4647 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4651 rc
= ata_pad_alloc(ap
, dev
);
4653 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4657 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4664 * ata_port_stop - Undo ata_port_start()
4665 * @ap: Port to shut down
4667 * Frees the PRD table.
4669 * May be used as the port_stop() entry in ata_port_operations.
4672 * Inherited from caller.
4675 void ata_port_stop (struct ata_port
*ap
)
4677 struct device
*dev
= ap
->host_set
->dev
;
4679 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4680 ata_pad_free(ap
, dev
);
4683 void ata_host_stop (struct ata_host_set
*host_set
)
4685 if (host_set
->mmio_base
)
4686 iounmap(host_set
->mmio_base
);
4691 * ata_host_remove - Unregister SCSI host structure with upper layers
4692 * @ap: Port to unregister
4693 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4696 * Inherited from caller.
4699 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4701 struct Scsi_Host
*sh
= ap
->host
;
4706 scsi_remove_host(sh
);
4708 ap
->ops
->port_stop(ap
);
4712 * ata_host_init - Initialize an ata_port structure
4713 * @ap: Structure to initialize
4714 * @host: associated SCSI mid-layer structure
4715 * @host_set: Collection of hosts to which @ap belongs
4716 * @ent: Probe information provided by low-level driver
4717 * @port_no: Port number associated with this ata_port
4719 * Initialize a new ata_port structure, and its associated
4723 * Inherited from caller.
4726 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4727 struct ata_host_set
*host_set
,
4728 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4734 host
->max_channel
= 1;
4735 host
->unique_id
= ata_unique_id
++;
4736 host
->max_cmd_len
= 12;
4738 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4739 ap
->id
= host
->unique_id
;
4741 ap
->ctl
= ATA_DEVCTL_OBS
;
4742 ap
->host_set
= host_set
;
4743 ap
->port_no
= port_no
;
4745 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4746 ap
->pio_mask
= ent
->pio_mask
;
4747 ap
->mwdma_mask
= ent
->mwdma_mask
;
4748 ap
->udma_mask
= ent
->udma_mask
;
4749 ap
->flags
|= ent
->host_flags
;
4750 ap
->ops
= ent
->port_ops
;
4751 ap
->cbl
= ATA_CBL_NONE
;
4752 ap
->active_tag
= ATA_TAG_POISON
;
4753 ap
->last_ctl
= 0xFF;
4755 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4756 INIT_LIST_HEAD(&ap
->eh_done_q
);
4758 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4759 ap
->device
[i
].devno
= i
;
4762 ap
->stats
.unhandled_irq
= 1;
4763 ap
->stats
.idle_irq
= 1;
4766 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4770 * ata_host_add - Attach low-level ATA driver to system
4771 * @ent: Information provided by low-level driver
4772 * @host_set: Collections of ports to which we add
4773 * @port_no: Port number associated with this host
4775 * Attach low-level ATA driver to system.
4778 * PCI/etc. bus probe sem.
4781 * New ata_port on success, for NULL on error.
4784 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4785 struct ata_host_set
*host_set
,
4786 unsigned int port_no
)
4788 struct Scsi_Host
*host
;
4789 struct ata_port
*ap
;
4793 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4797 ap
= (struct ata_port
*) &host
->hostdata
[0];
4799 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4801 rc
= ap
->ops
->port_start(ap
);
4808 scsi_host_put(host
);
4813 * ata_device_add - Register hardware device with ATA and SCSI layers
4814 * @ent: Probe information describing hardware device to be registered
4816 * This function processes the information provided in the probe
4817 * information struct @ent, allocates the necessary ATA and SCSI
4818 * host information structures, initializes them, and registers
4819 * everything with requisite kernel subsystems.
4821 * This function requests irqs, probes the ATA bus, and probes
4825 * PCI/etc. bus probe sem.
4828 * Number of ports registered. Zero on error (no ports registered).
4831 int ata_device_add(const struct ata_probe_ent
*ent
)
4833 unsigned int count
= 0, i
;
4834 struct device
*dev
= ent
->dev
;
4835 struct ata_host_set
*host_set
;
4838 /* alloc a container for our list of ATA ports (buses) */
4839 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4840 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4843 spin_lock_init(&host_set
->lock
);
4845 host_set
->dev
= dev
;
4846 host_set
->n_ports
= ent
->n_ports
;
4847 host_set
->irq
= ent
->irq
;
4848 host_set
->mmio_base
= ent
->mmio_base
;
4849 host_set
->private_data
= ent
->private_data
;
4850 host_set
->ops
= ent
->port_ops
;
4852 /* register each port bound to this device */
4853 for (i
= 0; i
< ent
->n_ports
; i
++) {
4854 struct ata_port
*ap
;
4855 unsigned long xfer_mode_mask
;
4857 ap
= ata_host_add(ent
, host_set
, i
);
4861 host_set
->ports
[i
] = ap
;
4862 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4863 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4864 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4866 /* print per-port info to dmesg */
4867 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4868 "bmdma 0x%lX irq %lu\n",
4870 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4871 ata_mode_string(xfer_mode_mask
),
4872 ap
->ioaddr
.cmd_addr
,
4873 ap
->ioaddr
.ctl_addr
,
4874 ap
->ioaddr
.bmdma_addr
,
4878 host_set
->ops
->irq_clear(ap
);
4885 /* obtain irq, that is shared between channels */
4886 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4887 DRV_NAME
, host_set
))
4890 /* perform each probe synchronously */
4891 DPRINTK("probe begin\n");
4892 for (i
= 0; i
< count
; i
++) {
4893 struct ata_port
*ap
;
4896 ap
= host_set
->ports
[i
];
4898 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4899 rc
= ata_bus_probe(ap
);
4900 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4903 /* FIXME: do something useful here?
4904 * Current libata behavior will
4905 * tear down everything when
4906 * the module is removed
4907 * or the h/w is unplugged.
4911 rc
= scsi_add_host(ap
->host
, dev
);
4913 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4915 /* FIXME: do something useful here */
4916 /* FIXME: handle unconditional calls to
4917 * scsi_scan_host and ata_host_remove, below,
4923 /* probes are done, now scan each port's disk(s) */
4924 DPRINTK("host probe begin\n");
4925 for (i
= 0; i
< count
; i
++) {
4926 struct ata_port
*ap
= host_set
->ports
[i
];
4928 ata_scsi_scan_host(ap
);
4931 dev_set_drvdata(dev
, host_set
);
4933 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4934 return ent
->n_ports
; /* success */
4937 for (i
= 0; i
< count
; i
++) {
4938 ata_host_remove(host_set
->ports
[i
], 1);
4939 scsi_host_put(host_set
->ports
[i
]->host
);
4943 VPRINTK("EXIT, returning 0\n");
4948 * ata_host_set_remove - PCI layer callback for device removal
4949 * @host_set: ATA host set that was removed
4951 * Unregister all objects associated with this host set. Free those
4955 * Inherited from calling layer (may sleep).
4958 void ata_host_set_remove(struct ata_host_set
*host_set
)
4960 struct ata_port
*ap
;
4963 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4964 ap
= host_set
->ports
[i
];
4965 scsi_remove_host(ap
->host
);
4968 free_irq(host_set
->irq
, host_set
);
4970 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4971 ap
= host_set
->ports
[i
];
4973 ata_scsi_release(ap
->host
);
4975 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4976 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4978 if (ioaddr
->cmd_addr
== 0x1f0)
4979 release_region(0x1f0, 8);
4980 else if (ioaddr
->cmd_addr
== 0x170)
4981 release_region(0x170, 8);
4984 scsi_host_put(ap
->host
);
4987 if (host_set
->ops
->host_stop
)
4988 host_set
->ops
->host_stop(host_set
);
4994 * ata_scsi_release - SCSI layer callback hook for host unload
4995 * @host: libata host to be unloaded
4997 * Performs all duties necessary to shut down a libata port...
4998 * Kill port kthread, disable port, and release resources.
5001 * Inherited from SCSI layer.
5007 int ata_scsi_release(struct Scsi_Host
*host
)
5009 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
5013 ap
->ops
->port_disable(ap
);
5014 ata_host_remove(ap
, 0);
5021 * ata_std_ports - initialize ioaddr with standard port offsets.
5022 * @ioaddr: IO address structure to be initialized
5024 * Utility function which initializes data_addr, error_addr,
5025 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5026 * device_addr, status_addr, and command_addr to standard offsets
5027 * relative to cmd_addr.
5029 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5032 void ata_std_ports(struct ata_ioports
*ioaddr
)
5034 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5035 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5036 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5037 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5038 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5039 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5040 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5041 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5042 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5043 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5049 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5051 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5053 pci_iounmap(pdev
, host_set
->mmio_base
);
5057 * ata_pci_remove_one - PCI layer callback for device removal
5058 * @pdev: PCI device that was removed
5060 * PCI layer indicates to libata via this hook that
5061 * hot-unplug or module unload event has occurred.
5062 * Handle this by unregistering all objects associated
5063 * with this PCI device. Free those objects. Then finally
5064 * release PCI resources and disable device.
5067 * Inherited from PCI layer (may sleep).
5070 void ata_pci_remove_one (struct pci_dev
*pdev
)
5072 struct device
*dev
= pci_dev_to_dev(pdev
);
5073 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5075 ata_host_set_remove(host_set
);
5076 pci_release_regions(pdev
);
5077 pci_disable_device(pdev
);
5078 dev_set_drvdata(dev
, NULL
);
5081 /* move to PCI subsystem */
5082 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5084 unsigned long tmp
= 0;
5086 switch (bits
->width
) {
5089 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5095 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5101 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5112 return (tmp
== bits
->val
) ? 1 : 0;
5115 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5117 pci_save_state(pdev
);
5118 pci_disable_device(pdev
);
5119 pci_set_power_state(pdev
, PCI_D3hot
);
5123 int ata_pci_device_resume(struct pci_dev
*pdev
)
5125 pci_set_power_state(pdev
, PCI_D0
);
5126 pci_restore_state(pdev
);
5127 pci_enable_device(pdev
);
5128 pci_set_master(pdev
);
5131 #endif /* CONFIG_PCI */
5134 static int __init
ata_init(void)
5136 ata_wq
= create_workqueue("ata");
5140 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5144 static void __exit
ata_exit(void)
5146 destroy_workqueue(ata_wq
);
5149 module_init(ata_init
);
5150 module_exit(ata_exit
);
5152 static unsigned long ratelimit_time
;
5153 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5155 int ata_ratelimit(void)
5158 unsigned long flags
;
5160 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5162 if (time_after(jiffies
, ratelimit_time
)) {
5164 ratelimit_time
= jiffies
+ (HZ
/5);
5168 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5174 * libata is essentially a library of internal helper functions for
5175 * low-level ATA host controller drivers. As such, the API/ABI is
5176 * likely to change as new drivers are added and updated.
5177 * Do not depend on ABI/API stability.
5180 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5181 EXPORT_SYMBOL_GPL(ata_std_ports
);
5182 EXPORT_SYMBOL_GPL(ata_device_add
);
5183 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5184 EXPORT_SYMBOL_GPL(ata_sg_init
);
5185 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5186 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5187 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5188 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5189 EXPORT_SYMBOL_GPL(ata_tf_load
);
5190 EXPORT_SYMBOL_GPL(ata_tf_read
);
5191 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5192 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5193 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5194 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5195 EXPORT_SYMBOL_GPL(ata_check_status
);
5196 EXPORT_SYMBOL_GPL(ata_altstatus
);
5197 EXPORT_SYMBOL_GPL(ata_exec_command
);
5198 EXPORT_SYMBOL_GPL(ata_port_start
);
5199 EXPORT_SYMBOL_GPL(ata_port_stop
);
5200 EXPORT_SYMBOL_GPL(ata_host_stop
);
5201 EXPORT_SYMBOL_GPL(ata_interrupt
);
5202 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5203 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5204 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5205 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5206 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5207 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5208 EXPORT_SYMBOL_GPL(ata_port_probe
);
5209 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5210 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5211 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5212 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5213 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5214 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5215 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5216 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5217 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5218 EXPORT_SYMBOL_GPL(ata_port_disable
);
5219 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5220 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5221 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5222 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5223 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
5224 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5225 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5226 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5227 EXPORT_SYMBOL_GPL(ata_host_intr
);
5228 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5229 EXPORT_SYMBOL_GPL(ata_id_string
);
5230 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5231 EXPORT_SYMBOL_GPL(ata_dev_config
);
5232 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5233 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5234 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5236 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5237 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5238 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5241 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5242 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5243 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5244 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5245 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5246 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5247 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5248 #endif /* CONFIG_PCI */
5250 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5251 EXPORT_SYMBOL_GPL(ata_device_resume
);
5252 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5253 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);