2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
);
65 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
);
69 static int fgb(u32 bitmap
);
70 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
72 unsigned int *xfer_shift_out
);
73 static void ata_pio_error(struct ata_port
*ap
);
75 static unsigned int ata_unique_id
= 1;
76 static struct workqueue_struct
*ata_wq
;
78 int atapi_enabled
= 0;
79 module_param(atapi_enabled
, int, 0444);
80 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION
);
88 * ata_tf_load_pio - send taskfile registers to host controller
89 * @ap: Port to which output is sent
90 * @tf: ATA taskfile register set
92 * Outputs ATA taskfile to standard ATA host controller.
95 * Inherited from caller.
98 static void ata_tf_load_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
100 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
101 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
103 if (tf
->ctl
!= ap
->last_ctl
) {
104 outb(tf
->ctl
, ioaddr
->ctl_addr
);
105 ap
->last_ctl
= tf
->ctl
;
109 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
110 outb(tf
->hob_feature
, ioaddr
->feature_addr
);
111 outb(tf
->hob_nsect
, ioaddr
->nsect_addr
);
112 outb(tf
->hob_lbal
, ioaddr
->lbal_addr
);
113 outb(tf
->hob_lbam
, ioaddr
->lbam_addr
);
114 outb(tf
->hob_lbah
, ioaddr
->lbah_addr
);
115 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
124 outb(tf
->feature
, ioaddr
->feature_addr
);
125 outb(tf
->nsect
, ioaddr
->nsect_addr
);
126 outb(tf
->lbal
, ioaddr
->lbal_addr
);
127 outb(tf
->lbam
, ioaddr
->lbam_addr
);
128 outb(tf
->lbah
, ioaddr
->lbah_addr
);
129 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
137 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
138 outb(tf
->device
, ioaddr
->device_addr
);
139 VPRINTK("device 0x%X\n", tf
->device
);
146 * ata_tf_load_mmio - send taskfile registers to host controller
147 * @ap: Port to which output is sent
148 * @tf: ATA taskfile register set
150 * Outputs ATA taskfile to standard ATA host controller using MMIO.
153 * Inherited from caller.
156 static void ata_tf_load_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
158 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
159 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
161 if (tf
->ctl
!= ap
->last_ctl
) {
162 writeb(tf
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
163 ap
->last_ctl
= tf
->ctl
;
167 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
168 writeb(tf
->hob_feature
, (void __iomem
*) ioaddr
->feature_addr
);
169 writeb(tf
->hob_nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
170 writeb(tf
->hob_lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
171 writeb(tf
->hob_lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
172 writeb(tf
->hob_lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
173 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
182 writeb(tf
->feature
, (void __iomem
*) ioaddr
->feature_addr
);
183 writeb(tf
->nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
184 writeb(tf
->lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
185 writeb(tf
->lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
186 writeb(tf
->lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
187 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
195 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
196 writeb(tf
->device
, (void __iomem
*) ioaddr
->device_addr
);
197 VPRINTK("device 0x%X\n", tf
->device
);
205 * ata_tf_load - send taskfile registers to host controller
206 * @ap: Port to which output is sent
207 * @tf: ATA taskfile register set
209 * Outputs ATA taskfile to standard ATA host controller using MMIO
210 * or PIO as indicated by the ATA_FLAG_MMIO flag.
211 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
212 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
213 * hob_lbal, hob_lbam, and hob_lbah.
215 * This function waits for idle (!BUSY and !DRQ) after writing
216 * registers. If the control register has a new value, this
217 * function also waits for idle after writing control and before
218 * writing the remaining registers.
220 * May be used as the tf_load() entry in ata_port_operations.
223 * Inherited from caller.
225 void ata_tf_load(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
227 if (ap
->flags
& ATA_FLAG_MMIO
)
228 ata_tf_load_mmio(ap
, tf
);
230 ata_tf_load_pio(ap
, tf
);
234 * ata_exec_command_pio - issue ATA command to host controller
235 * @ap: port to which command is being issued
236 * @tf: ATA taskfile register set
238 * Issues PIO write to ATA command register, with proper
239 * synchronization with interrupt handler / other threads.
242 * spin_lock_irqsave(host_set lock)
245 static void ata_exec_command_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
247 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
249 outb(tf
->command
, ap
->ioaddr
.command_addr
);
255 * ata_exec_command_mmio - issue ATA command to host controller
256 * @ap: port to which command is being issued
257 * @tf: ATA taskfile register set
259 * Issues MMIO write to ATA command register, with proper
260 * synchronization with interrupt handler / other threads.
263 * spin_lock_irqsave(host_set lock)
266 static void ata_exec_command_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
268 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
270 writeb(tf
->command
, (void __iomem
*) ap
->ioaddr
.command_addr
);
276 * ata_exec_command - issue ATA command to host controller
277 * @ap: port to which command is being issued
278 * @tf: ATA taskfile register set
280 * Issues PIO/MMIO write to ATA command register, with proper
281 * synchronization with interrupt handler / other threads.
284 * spin_lock_irqsave(host_set lock)
286 void ata_exec_command(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
288 if (ap
->flags
& ATA_FLAG_MMIO
)
289 ata_exec_command_mmio(ap
, tf
);
291 ata_exec_command_pio(ap
, tf
);
295 * ata_tf_to_host - issue ATA taskfile to host controller
296 * @ap: port to which command is being issued
297 * @tf: ATA taskfile register set
299 * Issues ATA taskfile register set to ATA host controller,
300 * with proper synchronization with interrupt handler and
304 * spin_lock_irqsave(host_set lock)
307 static inline void ata_tf_to_host(struct ata_port
*ap
,
308 const struct ata_taskfile
*tf
)
310 ap
->ops
->tf_load(ap
, tf
);
311 ap
->ops
->exec_command(ap
, tf
);
315 * ata_tf_read_pio - input device's ATA taskfile shadow registers
316 * @ap: Port from which input is read
317 * @tf: ATA taskfile register set for storing input
319 * Reads ATA taskfile registers for currently-selected device
323 * Inherited from caller.
326 static void ata_tf_read_pio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
328 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
330 tf
->command
= ata_check_status(ap
);
331 tf
->feature
= inb(ioaddr
->error_addr
);
332 tf
->nsect
= inb(ioaddr
->nsect_addr
);
333 tf
->lbal
= inb(ioaddr
->lbal_addr
);
334 tf
->lbam
= inb(ioaddr
->lbam_addr
);
335 tf
->lbah
= inb(ioaddr
->lbah_addr
);
336 tf
->device
= inb(ioaddr
->device_addr
);
338 if (tf
->flags
& ATA_TFLAG_LBA48
) {
339 outb(tf
->ctl
| ATA_HOB
, ioaddr
->ctl_addr
);
340 tf
->hob_feature
= inb(ioaddr
->error_addr
);
341 tf
->hob_nsect
= inb(ioaddr
->nsect_addr
);
342 tf
->hob_lbal
= inb(ioaddr
->lbal_addr
);
343 tf
->hob_lbam
= inb(ioaddr
->lbam_addr
);
344 tf
->hob_lbah
= inb(ioaddr
->lbah_addr
);
349 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
350 * @ap: Port from which input is read
351 * @tf: ATA taskfile register set for storing input
353 * Reads ATA taskfile registers for currently-selected device
357 * Inherited from caller.
360 static void ata_tf_read_mmio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
362 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
364 tf
->command
= ata_check_status(ap
);
365 tf
->feature
= readb((void __iomem
*)ioaddr
->error_addr
);
366 tf
->nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
367 tf
->lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
368 tf
->lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
369 tf
->lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
370 tf
->device
= readb((void __iomem
*)ioaddr
->device_addr
);
372 if (tf
->flags
& ATA_TFLAG_LBA48
) {
373 writeb(tf
->ctl
| ATA_HOB
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
374 tf
->hob_feature
= readb((void __iomem
*)ioaddr
->error_addr
);
375 tf
->hob_nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
376 tf
->hob_lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
377 tf
->hob_lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
378 tf
->hob_lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
384 * ata_tf_read - input device's ATA taskfile shadow registers
385 * @ap: Port from which input is read
386 * @tf: ATA taskfile register set for storing input
388 * Reads ATA taskfile registers for currently-selected device
391 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
392 * is set, also reads the hob registers.
394 * May be used as the tf_read() entry in ata_port_operations.
397 * Inherited from caller.
399 void ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
)
401 if (ap
->flags
& ATA_FLAG_MMIO
)
402 ata_tf_read_mmio(ap
, tf
);
404 ata_tf_read_pio(ap
, tf
);
408 * ata_check_status_pio - Read device status reg & clear interrupt
409 * @ap: port where the device is
411 * Reads ATA taskfile status register for currently-selected device
412 * and return its value. This also clears pending interrupts
416 * Inherited from caller.
418 static u8
ata_check_status_pio(struct ata_port
*ap
)
420 return inb(ap
->ioaddr
.status_addr
);
424 * ata_check_status_mmio - Read device status reg & clear interrupt
425 * @ap: port where the device is
427 * Reads ATA taskfile status register for currently-selected device
428 * via MMIO and return its value. This also clears pending interrupts
432 * Inherited from caller.
434 static u8
ata_check_status_mmio(struct ata_port
*ap
)
436 return readb((void __iomem
*) ap
->ioaddr
.status_addr
);
441 * ata_check_status - Read device status reg & clear interrupt
442 * @ap: port where the device is
444 * Reads ATA taskfile status register for currently-selected device
445 * and return its value. This also clears pending interrupts
448 * May be used as the check_status() entry in ata_port_operations.
451 * Inherited from caller.
453 u8
ata_check_status(struct ata_port
*ap
)
455 if (ap
->flags
& ATA_FLAG_MMIO
)
456 return ata_check_status_mmio(ap
);
457 return ata_check_status_pio(ap
);
462 * ata_altstatus - Read device alternate status reg
463 * @ap: port where the device is
465 * Reads ATA taskfile alternate status register for
466 * currently-selected device and return its value.
468 * Note: may NOT be used as the check_altstatus() entry in
469 * ata_port_operations.
472 * Inherited from caller.
474 u8
ata_altstatus(struct ata_port
*ap
)
476 if (ap
->ops
->check_altstatus
)
477 return ap
->ops
->check_altstatus(ap
);
479 if (ap
->flags
& ATA_FLAG_MMIO
)
480 return readb((void __iomem
*)ap
->ioaddr
.altstatus_addr
);
481 return inb(ap
->ioaddr
.altstatus_addr
);
486 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
487 * @tf: Taskfile to convert
488 * @fis: Buffer into which data will output
489 * @pmp: Port multiplier port
491 * Converts a standard ATA taskfile to a Serial ATA
492 * FIS structure (Register - Host to Device).
495 * Inherited from caller.
498 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
500 fis
[0] = 0x27; /* Register - Host to Device FIS */
501 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
502 bit 7 indicates Command FIS */
503 fis
[2] = tf
->command
;
504 fis
[3] = tf
->feature
;
511 fis
[8] = tf
->hob_lbal
;
512 fis
[9] = tf
->hob_lbam
;
513 fis
[10] = tf
->hob_lbah
;
514 fis
[11] = tf
->hob_feature
;
517 fis
[13] = tf
->hob_nsect
;
528 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
529 * @fis: Buffer from which data will be input
530 * @tf: Taskfile to output
532 * Converts a serial ATA FIS structure to a standard ATA taskfile.
535 * Inherited from caller.
538 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
540 tf
->command
= fis
[2]; /* status */
541 tf
->feature
= fis
[3]; /* error */
548 tf
->hob_lbal
= fis
[8];
549 tf
->hob_lbam
= fis
[9];
550 tf
->hob_lbah
= fis
[10];
553 tf
->hob_nsect
= fis
[13];
556 static const u8 ata_rw_cmds
[] = {
560 ATA_CMD_READ_MULTI_EXT
,
561 ATA_CMD_WRITE_MULTI_EXT
,
565 ATA_CMD_WRITE_MULTI_FUA_EXT
,
569 ATA_CMD_PIO_READ_EXT
,
570 ATA_CMD_PIO_WRITE_EXT
,
583 ATA_CMD_WRITE_FUA_EXT
587 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
588 * @qc: command to examine and configure
590 * Examine the device configuration and tf->flags to calculate
591 * the proper read/write commands and protocol to use.
596 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
598 struct ata_taskfile
*tf
= &qc
->tf
;
599 struct ata_device
*dev
= qc
->dev
;
602 int index
, fua
, lba48
, write
;
604 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
605 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
606 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
608 if (dev
->flags
& ATA_DFLAG_PIO
) {
609 tf
->protocol
= ATA_PROT_PIO
;
610 index
= dev
->multi_count
? 0 : 8;
611 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
612 /* Unable to use DMA due to host limitation */
613 tf
->protocol
= ATA_PROT_PIO
;
614 index
= dev
->multi_count
? 0 : 8;
616 tf
->protocol
= ATA_PROT_DMA
;
620 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
628 static const char * const xfer_mode_str
[] = {
648 * ata_udma_string - convert UDMA bit offset to string
649 * @mask: mask of bits supported; only highest bit counts.
651 * Determine string which represents the highest speed
652 * (highest bit in @udma_mask).
658 * Constant C string representing highest speed listed in
659 * @udma_mask, or the constant C string "<n/a>".
662 static const char *ata_mode_string(unsigned int mask
)
666 for (i
= 7; i
>= 0; i
--)
669 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
672 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
679 return xfer_mode_str
[i
];
683 * ata_pio_devchk - PATA device presence detection
684 * @ap: ATA channel to examine
685 * @device: Device to examine (starting at zero)
687 * This technique was originally described in
688 * Hale Landis's ATADRVR (www.ata-atapi.com), and
689 * later found its way into the ATA/ATAPI spec.
691 * Write a pattern to the ATA shadow registers,
692 * and if a device is present, it will respond by
693 * correctly storing and echoing back the
694 * ATA shadow register contents.
700 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
703 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
706 ap
->ops
->dev_select(ap
, device
);
708 outb(0x55, ioaddr
->nsect_addr
);
709 outb(0xaa, ioaddr
->lbal_addr
);
711 outb(0xaa, ioaddr
->nsect_addr
);
712 outb(0x55, ioaddr
->lbal_addr
);
714 outb(0x55, ioaddr
->nsect_addr
);
715 outb(0xaa, ioaddr
->lbal_addr
);
717 nsect
= inb(ioaddr
->nsect_addr
);
718 lbal
= inb(ioaddr
->lbal_addr
);
720 if ((nsect
== 0x55) && (lbal
== 0xaa))
721 return 1; /* we found a device */
723 return 0; /* nothing found */
727 * ata_mmio_devchk - PATA device presence detection
728 * @ap: ATA channel to examine
729 * @device: Device to examine (starting at zero)
731 * This technique was originally described in
732 * Hale Landis's ATADRVR (www.ata-atapi.com), and
733 * later found its way into the ATA/ATAPI spec.
735 * Write a pattern to the ATA shadow registers,
736 * and if a device is present, it will respond by
737 * correctly storing and echoing back the
738 * ATA shadow register contents.
744 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
747 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
750 ap
->ops
->dev_select(ap
, device
);
752 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
753 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
755 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
756 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
758 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
759 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
761 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
762 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
764 if ((nsect
== 0x55) && (lbal
== 0xaa))
765 return 1; /* we found a device */
767 return 0; /* nothing found */
771 * ata_devchk - PATA device presence detection
772 * @ap: ATA channel to examine
773 * @device: Device to examine (starting at zero)
775 * Dispatch ATA device presence detection, depending
776 * on whether we are using PIO or MMIO to talk to the
777 * ATA shadow registers.
783 static unsigned int ata_devchk(struct ata_port
*ap
,
786 if (ap
->flags
& ATA_FLAG_MMIO
)
787 return ata_mmio_devchk(ap
, device
);
788 return ata_pio_devchk(ap
, device
);
792 * ata_dev_classify - determine device type based on ATA-spec signature
793 * @tf: ATA taskfile register set for device to be identified
795 * Determine from taskfile register contents whether a device is
796 * ATA or ATAPI, as per "Signature and persistence" section
797 * of ATA/PI spec (volume 1, sect 5.14).
803 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
804 * the event of failure.
807 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
809 /* Apple's open source Darwin code hints that some devices only
810 * put a proper signature into the LBA mid/high registers,
811 * So, we only check those. It's sufficient for uniqueness.
814 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
815 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
816 DPRINTK("found ATA device by sig\n");
820 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
821 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
822 DPRINTK("found ATAPI device by sig\n");
823 return ATA_DEV_ATAPI
;
826 DPRINTK("unknown device\n");
827 return ATA_DEV_UNKNOWN
;
831 * ata_dev_try_classify - Parse returned ATA device signature
832 * @ap: ATA channel to examine
833 * @device: Device to examine (starting at zero)
834 * @r_err: Value of error register on completion
836 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
837 * an ATA/ATAPI-defined set of values is placed in the ATA
838 * shadow registers, indicating the results of device detection
841 * Select the ATA device, and read the values from the ATA shadow
842 * registers. Then parse according to the Error register value,
843 * and the spec-defined values examined by ata_dev_classify().
849 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
853 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
855 struct ata_taskfile tf
;
859 ap
->ops
->dev_select(ap
, device
);
861 memset(&tf
, 0, sizeof(tf
));
863 ap
->ops
->tf_read(ap
, &tf
);
868 /* see if device passed diags */
871 else if ((device
== 0) && (err
== 0x81))
876 /* determine if device is ATA or ATAPI */
877 class = ata_dev_classify(&tf
);
879 if (class == ATA_DEV_UNKNOWN
)
881 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
887 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
888 * @id: IDENTIFY DEVICE results we will examine
889 * @s: string into which data is output
890 * @ofs: offset into identify device page
891 * @len: length of string to return. must be an even number.
893 * The strings in the IDENTIFY DEVICE page are broken up into
894 * 16-bit chunks. Run through the string, and output each
895 * 8-bit chunk linearly, regardless of platform.
901 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
902 unsigned int ofs
, unsigned int len
)
922 * ata_noop_dev_select - Select device 0/1 on ATA bus
923 * @ap: ATA channel to manipulate
924 * @device: ATA device (numbered from zero) to select
926 * This function performs no actual function.
928 * May be used as the dev_select() entry in ata_port_operations.
933 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
939 * ata_std_dev_select - Select device 0/1 on ATA bus
940 * @ap: ATA channel to manipulate
941 * @device: ATA device (numbered from zero) to select
943 * Use the method defined in the ATA specification to
944 * make either device 0, or device 1, active on the
945 * ATA channel. Works with both PIO and MMIO.
947 * May be used as the dev_select() entry in ata_port_operations.
953 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
958 tmp
= ATA_DEVICE_OBS
;
960 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
962 if (ap
->flags
& ATA_FLAG_MMIO
) {
963 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
965 outb(tmp
, ap
->ioaddr
.device_addr
);
967 ata_pause(ap
); /* needed; also flushes, for mmio */
971 * ata_dev_select - Select device 0/1 on ATA bus
972 * @ap: ATA channel to manipulate
973 * @device: ATA device (numbered from zero) to select
974 * @wait: non-zero to wait for Status register BSY bit to clear
975 * @can_sleep: non-zero if context allows sleeping
977 * Use the method defined in the ATA specification to
978 * make either device 0, or device 1, active on the
981 * This is a high-level version of ata_std_dev_select(),
982 * which additionally provides the services of inserting
983 * the proper pauses and status polling, where needed.
989 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
990 unsigned int wait
, unsigned int can_sleep
)
992 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
993 ap
->id
, device
, wait
);
998 ap
->ops
->dev_select(ap
, device
);
1001 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
1008 * ata_dump_id - IDENTIFY DEVICE info debugging output
1009 * @dev: Device whose IDENTIFY DEVICE page we will dump
1011 * Dump selected 16-bit words from a detected device's
1012 * IDENTIFY PAGE page.
1018 static inline void ata_dump_id(const struct ata_device
*dev
)
1020 DPRINTK("49==0x%04x "
1030 DPRINTK("80==0x%04x "
1040 DPRINTK("88==0x%04x "
1047 * Compute the PIO modes available for this device. This is not as
1048 * trivial as it seems if we must consider early devices correctly.
1050 * FIXME: pre IDE drive timing (do we care ?).
1053 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
1057 /* Usual case. Word 53 indicates word 64 is valid */
1058 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
1059 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
1065 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
1066 number for the maximum. Turn it into a mask and return it */
1067 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
1069 /* But wait.. there's more. Design your standards by committee and
1070 you too can get a free iordy field to process. However its the
1071 speeds not the modes that are supported... Note drivers using the
1072 timing API will get this right anyway */
1076 ata_queue_pio_task(struct ata_port
*ap
)
1078 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
1079 queue_work(ata_wq
, &ap
->pio_task
);
1083 ata_queue_delayed_pio_task(struct ata_port
*ap
, unsigned long delay
)
1085 if (!(ap
->flags
& ATA_FLAG_FLUSH_PIO_TASK
))
1086 queue_delayed_work(ata_wq
, &ap
->pio_task
, delay
);
1090 * ata_flush_pio_tasks - Flush pio_task
1091 * @ap: the target ata_port
1093 * After this function completes, pio_task is
1094 * guranteed not to be running or scheduled.
1097 * Kernel thread context (may sleep)
1100 static void ata_flush_pio_tasks(struct ata_port
*ap
)
1103 unsigned long flags
;
1107 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1108 ap
->flags
|= ATA_FLAG_FLUSH_PIO_TASK
;
1109 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1111 DPRINTK("flush #1\n");
1112 flush_workqueue(ata_wq
);
1115 * At this point, if a task is running, it's guaranteed to see
1116 * the FLUSH flag; thus, it will never queue pio tasks again.
1119 tmp
|= cancel_delayed_work(&ap
->pio_task
);
1121 DPRINTK("flush #2\n");
1122 flush_workqueue(ata_wq
);
1125 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1126 ap
->flags
&= ~ATA_FLAG_FLUSH_PIO_TASK
;
1127 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1132 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
1134 struct completion
*waiting
= qc
->private_data
;
1136 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
1141 * ata_exec_internal - execute libata internal command
1142 * @ap: Port to which the command is sent
1143 * @dev: Device to which the command is sent
1144 * @tf: Taskfile registers for the command and the result
1145 * @dma_dir: Data tranfer direction of the command
1146 * @buf: Data buffer of the command
1147 * @buflen: Length of data buffer
1149 * Executes libata internal command with timeout. @tf contains
1150 * command on entry and result on return. Timeout and error
1151 * conditions are reported via return value. No recovery action
1152 * is taken after a command times out. It's caller's duty to
1153 * clean up after timeout.
1156 * None. Should be called with kernel context, might sleep.
1160 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
1161 struct ata_taskfile
*tf
,
1162 int dma_dir
, void *buf
, unsigned int buflen
)
1164 u8 command
= tf
->command
;
1165 struct ata_queued_cmd
*qc
;
1166 DECLARE_COMPLETION(wait
);
1167 unsigned long flags
;
1168 unsigned int err_mask
;
1170 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1172 qc
= ata_qc_new_init(ap
, dev
);
1176 qc
->dma_dir
= dma_dir
;
1177 if (dma_dir
!= DMA_NONE
) {
1178 ata_sg_init_one(qc
, buf
, buflen
);
1179 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1182 qc
->private_data
= &wait
;
1183 qc
->complete_fn
= ata_qc_complete_internal
;
1185 qc
->err_mask
= ata_qc_issue(qc
);
1187 ata_qc_complete(qc
);
1189 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1191 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1192 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1194 /* We're racing with irq here. If we lose, the
1195 * following test prevents us from completing the qc
1196 * again. If completion irq occurs after here but
1197 * before the caller cleans up, it will result in a
1198 * spurious interrupt. We can live with that.
1200 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1201 qc
->err_mask
= AC_ERR_TIMEOUT
;
1202 ata_qc_complete(qc
);
1203 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1207 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1211 err_mask
= qc
->err_mask
;
1219 * ata_pio_need_iordy - check if iordy needed
1222 * Check if the current speed of the device requires IORDY. Used
1223 * by various controllers for chip configuration.
1226 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1229 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1236 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1238 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1239 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1240 /* Is the speed faster than the drive allows non IORDY ? */
1242 /* This is cycle times not frequency - watch the logic! */
1243 if (pio
> 240) /* PIO2 is 240nS per cycle */
1252 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1253 * @ap: port on which device we wish to probe resides
1254 * @device: device bus address, starting at zero
1256 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1257 * command, and read back the 512-byte device information page.
1258 * The device information page is fed to us via the standard
1259 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1260 * using standard PIO-IN paths)
1262 * After reading the device information page, we use several
1263 * bits of information from it to initialize data structures
1264 * that will be used during the lifetime of the ata_device.
1265 * Other data from the info page is used to disqualify certain
1266 * older ATA devices we do not wish to support.
1269 * Inherited from caller. Some functions called by this function
1270 * obtain the host_set lock.
1273 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1275 struct ata_device
*dev
= &ap
->device
[device
];
1276 unsigned int major_version
;
1278 unsigned long xfer_modes
;
1279 unsigned int using_edd
;
1280 struct ata_taskfile tf
;
1281 unsigned int err_mask
;
1284 if (!ata_dev_present(dev
)) {
1285 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1290 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1295 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1297 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1298 dev
->class == ATA_DEV_NONE
);
1300 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1303 ata_tf_init(ap
, &tf
, device
);
1305 if (dev
->class == ATA_DEV_ATA
) {
1306 tf
.command
= ATA_CMD_ID_ATA
;
1307 DPRINTK("do ATA identify\n");
1309 tf
.command
= ATA_CMD_ID_ATAPI
;
1310 DPRINTK("do ATAPI identify\n");
1313 tf
.protocol
= ATA_PROT_PIO
;
1315 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1316 dev
->id
, sizeof(dev
->id
));
1319 if (err_mask
& ~AC_ERR_DEV
)
1323 * arg! EDD works for all test cases, but seems to return
1324 * the ATA signature for some ATAPI devices. Until the
1325 * reason for this is found and fixed, we fix up the mess
1326 * here. If IDENTIFY DEVICE returns command aborted
1327 * (as ATAPI devices do), then we issue an
1328 * IDENTIFY PACKET DEVICE.
1330 * ATA software reset (SRST, the default) does not appear
1331 * to have this problem.
1333 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
1334 u8 err
= tf
.feature
;
1335 if (err
& ATA_ABORTED
) {
1336 dev
->class = ATA_DEV_ATAPI
;
1343 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1345 /* print device capabilities */
1346 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1347 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1348 ap
->id
, device
, dev
->id
[49],
1349 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1350 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1354 * common ATA, ATAPI feature tests
1357 /* we require DMA support (bits 8 of word 49) */
1358 if (!ata_id_has_dma(dev
->id
)) {
1359 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1363 /* quick-n-dirty find max transfer mode; for printk only */
1364 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1366 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1368 xfer_modes
= ata_pio_modes(dev
);
1372 /* ATA-specific feature tests */
1373 if (dev
->class == ATA_DEV_ATA
) {
1374 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1377 /* get major version */
1378 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1379 for (major_version
= 14; major_version
>= 1; major_version
--)
1380 if (tmp
& (1 << major_version
))
1384 * The exact sequence expected by certain pre-ATA4 drives is:
1387 * INITIALIZE DEVICE PARAMETERS
1389 * Some drives were very specific about that exact sequence.
1391 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1392 ata_dev_init_params(ap
, dev
);
1394 /* current CHS translation info (id[53-58]) might be
1395 * changed. reread the identify device info.
1397 ata_dev_reread_id(ap
, dev
);
1400 if (ata_id_has_lba(dev
->id
)) {
1401 dev
->flags
|= ATA_DFLAG_LBA
;
1403 if (ata_id_has_lba48(dev
->id
)) {
1404 dev
->flags
|= ATA_DFLAG_LBA48
;
1405 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1407 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1410 /* print device info to dmesg */
1411 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1414 ata_mode_string(xfer_modes
),
1415 (unsigned long long)dev
->n_sectors
,
1416 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1420 /* Default translation */
1421 dev
->cylinders
= dev
->id
[1];
1422 dev
->heads
= dev
->id
[3];
1423 dev
->sectors
= dev
->id
[6];
1424 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1426 if (ata_id_current_chs_valid(dev
->id
)) {
1427 /* Current CHS translation is valid. */
1428 dev
->cylinders
= dev
->id
[54];
1429 dev
->heads
= dev
->id
[55];
1430 dev
->sectors
= dev
->id
[56];
1432 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1435 /* print device info to dmesg */
1436 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1439 ata_mode_string(xfer_modes
),
1440 (unsigned long long)dev
->n_sectors
,
1441 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1445 if (dev
->id
[59] & 0x100) {
1446 dev
->multi_count
= dev
->id
[59] & 0xff;
1447 DPRINTK("ata%u: dev %u multi count %u\n",
1448 ap
->id
, device
, dev
->multi_count
);
1451 ap
->host
->max_cmd_len
= 16;
1454 /* ATAPI-specific feature tests */
1455 else if (dev
->class == ATA_DEV_ATAPI
) {
1456 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1459 rc
= atapi_cdb_len(dev
->id
);
1460 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1461 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1464 ap
->cdb_len
= (unsigned int) rc
;
1465 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1467 if (ata_id_cdb_intr(dev
->id
))
1468 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1470 /* print device info to dmesg */
1471 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1473 ata_mode_string(xfer_modes
));
1476 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1480 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1483 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1484 DPRINTK("EXIT, err\n");
1488 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1490 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1494 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1501 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1503 /* limit bridge transfers to udma5, 200 sectors */
1504 if (ata_dev_knobble(ap
)) {
1505 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1506 ap
->id
, ap
->device
->devno
);
1507 ap
->udma_mask
&= ATA_UDMA5
;
1508 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1509 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1510 ap
->device
[i
].flags
|= ATA_DFLAG_LOCK_SECTORS
;
1513 if (ap
->ops
->dev_config
)
1514 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1518 * ata_bus_probe - Reset and probe ATA bus
1521 * Master ATA bus probing function. Initiates a hardware-dependent
1522 * bus reset, then attempts to identify any devices found on
1526 * PCI/etc. bus probe sem.
1529 * Zero on success, non-zero on error.
1532 static int ata_bus_probe(struct ata_port
*ap
)
1534 unsigned int i
, found
= 0;
1536 if (ap
->ops
->probe_reset
) {
1537 unsigned int classes
[ATA_MAX_DEVICES
];
1542 rc
= ap
->ops
->probe_reset(ap
, classes
);
1544 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1545 ap
->device
[i
].class = classes
[i
];
1547 printk(KERN_ERR
"ata%u: probe reset failed, "
1548 "disabling port\n", ap
->id
);
1549 ata_port_disable(ap
);
1552 ap
->ops
->phy_reset(ap
);
1554 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1557 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1558 ata_dev_identify(ap
, i
);
1559 if (ata_dev_present(&ap
->device
[i
])) {
1561 ata_dev_config(ap
,i
);
1565 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1566 goto err_out_disable
;
1569 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1570 goto err_out_disable
;
1575 ap
->ops
->port_disable(ap
);
1581 * ata_port_probe - Mark port as enabled
1582 * @ap: Port for which we indicate enablement
1584 * Modify @ap data structure such that the system
1585 * thinks that the entire port is enabled.
1587 * LOCKING: host_set lock, or some other form of
1591 void ata_port_probe(struct ata_port
*ap
)
1593 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1597 * sata_print_link_status - Print SATA link status
1598 * @ap: SATA port to printk link status about
1600 * This function prints link speed and status of a SATA link.
1605 static void sata_print_link_status(struct ata_port
*ap
)
1610 if (!ap
->ops
->scr_read
)
1613 sstatus
= scr_read(ap
, SCR_STATUS
);
1615 if (sata_dev_present(ap
)) {
1616 tmp
= (sstatus
>> 4) & 0xf;
1619 else if (tmp
& (1 << 1))
1622 speed
= "<unknown>";
1623 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1624 ap
->id
, speed
, sstatus
);
1626 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1632 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1633 * @ap: SATA port associated with target SATA PHY.
1635 * This function issues commands to standard SATA Sxxx
1636 * PHY registers, to wake up the phy (and device), and
1637 * clear any reset condition.
1640 * PCI/etc. bus probe sem.
1643 void __sata_phy_reset(struct ata_port
*ap
)
1646 unsigned long timeout
= jiffies
+ (HZ
* 5);
1648 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1649 /* issue phy wake/reset */
1650 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1651 /* Couldn't find anything in SATA I/II specs, but
1652 * AHCI-1.1 10.4.2 says at least 1 ms. */
1655 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1657 /* wait for phy to become ready, if necessary */
1660 sstatus
= scr_read(ap
, SCR_STATUS
);
1661 if ((sstatus
& 0xf) != 1)
1663 } while (time_before(jiffies
, timeout
));
1665 /* print link status */
1666 sata_print_link_status(ap
);
1668 /* TODO: phy layer with polling, timeouts, etc. */
1669 if (sata_dev_present(ap
))
1672 ata_port_disable(ap
);
1674 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1677 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1678 ata_port_disable(ap
);
1682 ap
->cbl
= ATA_CBL_SATA
;
1686 * sata_phy_reset - Reset SATA bus.
1687 * @ap: SATA port associated with target SATA PHY.
1689 * This function resets the SATA bus, and then probes
1690 * the bus for devices.
1693 * PCI/etc. bus probe sem.
1696 void sata_phy_reset(struct ata_port
*ap
)
1698 __sata_phy_reset(ap
);
1699 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1705 * ata_port_disable - Disable port.
1706 * @ap: Port to be disabled.
1708 * Modify @ap data structure such that the system
1709 * thinks that the entire port is disabled, and should
1710 * never attempt to probe or communicate with devices
1713 * LOCKING: host_set lock, or some other form of
1717 void ata_port_disable(struct ata_port
*ap
)
1719 ap
->device
[0].class = ATA_DEV_NONE
;
1720 ap
->device
[1].class = ATA_DEV_NONE
;
1721 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1725 * This mode timing computation functionality is ported over from
1726 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1729 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1730 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1731 * for PIO 5, which is a nonstandard extension and UDMA6, which
1732 * is currently supported only by Maxtor drives.
1735 static const struct ata_timing ata_timing
[] = {
1737 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1738 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1739 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1740 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1742 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1743 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1744 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1746 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1748 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1749 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1750 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1752 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1753 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1754 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1756 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1757 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1758 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1760 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1761 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1762 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1764 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1769 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1770 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1772 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1774 q
->setup
= EZ(t
->setup
* 1000, T
);
1775 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1776 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1777 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1778 q
->active
= EZ(t
->active
* 1000, T
);
1779 q
->recover
= EZ(t
->recover
* 1000, T
);
1780 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1781 q
->udma
= EZ(t
->udma
* 1000, UT
);
1784 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1785 struct ata_timing
*m
, unsigned int what
)
1787 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1788 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1789 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1790 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1791 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1792 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1793 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1794 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1797 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1799 const struct ata_timing
*t
;
1801 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1802 if (t
->mode
== 0xFF)
1807 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1808 struct ata_timing
*t
, int T
, int UT
)
1810 const struct ata_timing
*s
;
1811 struct ata_timing p
;
1817 if (!(s
= ata_timing_find_mode(speed
)))
1820 memcpy(t
, s
, sizeof(*s
));
1823 * If the drive is an EIDE drive, it can tell us it needs extended
1824 * PIO/MW_DMA cycle timing.
1827 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1828 memset(&p
, 0, sizeof(p
));
1829 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1830 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1831 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1832 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1833 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1835 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1839 * Convert the timing to bus clock counts.
1842 ata_timing_quantize(t
, t
, T
, UT
);
1845 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1846 * S.M.A.R.T * and some other commands. We have to ensure that the
1847 * DMA cycle timing is slower/equal than the fastest PIO timing.
1850 if (speed
> XFER_PIO_4
) {
1851 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1852 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1856 * Lengthen active & recovery time so that cycle time is correct.
1859 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1860 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1861 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1864 if (t
->active
+ t
->recover
< t
->cycle
) {
1865 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1866 t
->recover
= t
->cycle
- t
->active
;
1872 static const struct {
1875 } xfer_mode_classes
[] = {
1876 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1877 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1878 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1881 static u8
base_from_shift(unsigned int shift
)
1885 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1886 if (xfer_mode_classes
[i
].shift
== shift
)
1887 return xfer_mode_classes
[i
].base
;
1892 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1897 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1900 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1901 dev
->flags
|= ATA_DFLAG_PIO
;
1903 ata_dev_set_xfermode(ap
, dev
);
1905 base
= base_from_shift(dev
->xfer_shift
);
1906 ofs
= dev
->xfer_mode
- base
;
1907 idx
= ofs
+ dev
->xfer_shift
;
1908 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1910 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1911 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1913 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1914 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1917 static int ata_host_set_pio(struct ata_port
*ap
)
1923 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1926 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1930 base
= base_from_shift(ATA_SHIFT_PIO
);
1931 xfer_mode
= base
+ x
;
1933 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1934 (int)base
, (int)xfer_mode
, mask
, x
);
1936 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1937 struct ata_device
*dev
= &ap
->device
[i
];
1938 if (ata_dev_present(dev
)) {
1939 dev
->pio_mode
= xfer_mode
;
1940 dev
->xfer_mode
= xfer_mode
;
1941 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1942 if (ap
->ops
->set_piomode
)
1943 ap
->ops
->set_piomode(ap
, dev
);
1950 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1951 unsigned int xfer_shift
)
1955 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1956 struct ata_device
*dev
= &ap
->device
[i
];
1957 if (ata_dev_present(dev
)) {
1958 dev
->dma_mode
= xfer_mode
;
1959 dev
->xfer_mode
= xfer_mode
;
1960 dev
->xfer_shift
= xfer_shift
;
1961 if (ap
->ops
->set_dmamode
)
1962 ap
->ops
->set_dmamode(ap
, dev
);
1968 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1969 * @ap: port on which timings will be programmed
1971 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1974 * PCI/etc. bus probe sem.
1976 static void ata_set_mode(struct ata_port
*ap
)
1978 unsigned int xfer_shift
;
1982 /* step 1: always set host PIO timings */
1983 rc
= ata_host_set_pio(ap
);
1987 /* step 2: choose the best data xfer mode */
1988 xfer_mode
= xfer_shift
= 0;
1989 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1993 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1994 if (xfer_shift
!= ATA_SHIFT_PIO
)
1995 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1997 /* step 4: update devices' xfer mode */
1998 ata_dev_set_mode(ap
, &ap
->device
[0]);
1999 ata_dev_set_mode(ap
, &ap
->device
[1]);
2001 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
2004 if (ap
->ops
->post_set_mode
)
2005 ap
->ops
->post_set_mode(ap
);
2010 ata_port_disable(ap
);
2014 * ata_busy_sleep - sleep until BSY clears, or timeout
2015 * @ap: port containing status register to be polled
2016 * @tmout_pat: impatience timeout
2017 * @tmout: overall timeout
2019 * Sleep until ATA Status register bit BSY clears,
2020 * or a timeout occurs.
2025 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2026 unsigned long tmout_pat
, unsigned long tmout
)
2028 unsigned long timer_start
, timeout
;
2031 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2032 timer_start
= jiffies
;
2033 timeout
= timer_start
+ tmout_pat
;
2034 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2036 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2039 if (status
& ATA_BUSY
)
2040 printk(KERN_WARNING
"ata%u is slow to respond, "
2041 "please be patient\n", ap
->id
);
2043 timeout
= timer_start
+ tmout
;
2044 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2046 status
= ata_chk_status(ap
);
2049 if (status
& ATA_BUSY
) {
2050 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2051 ap
->id
, tmout
/ HZ
);
2058 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2060 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2061 unsigned int dev0
= devmask
& (1 << 0);
2062 unsigned int dev1
= devmask
& (1 << 1);
2063 unsigned long timeout
;
2065 /* if device 0 was found in ata_devchk, wait for its
2069 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2071 /* if device 1 was found in ata_devchk, wait for
2072 * register access, then wait for BSY to clear
2074 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2078 ap
->ops
->dev_select(ap
, 1);
2079 if (ap
->flags
& ATA_FLAG_MMIO
) {
2080 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2081 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2083 nsect
= inb(ioaddr
->nsect_addr
);
2084 lbal
= inb(ioaddr
->lbal_addr
);
2086 if ((nsect
== 1) && (lbal
== 1))
2088 if (time_after(jiffies
, timeout
)) {
2092 msleep(50); /* give drive a breather */
2095 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2097 /* is all this really necessary? */
2098 ap
->ops
->dev_select(ap
, 0);
2100 ap
->ops
->dev_select(ap
, 1);
2102 ap
->ops
->dev_select(ap
, 0);
2106 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
2107 * @ap: Port to reset and probe
2109 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
2110 * probe the bus. Not often used these days.
2113 * PCI/etc. bus probe sem.
2114 * Obtains host_set lock.
2118 static unsigned int ata_bus_edd(struct ata_port
*ap
)
2120 struct ata_taskfile tf
;
2121 unsigned long flags
;
2123 /* set up execute-device-diag (bus reset) taskfile */
2124 /* also, take interrupts to a known state (disabled) */
2125 DPRINTK("execute-device-diag\n");
2126 ata_tf_init(ap
, &tf
, 0);
2128 tf
.command
= ATA_CMD_EDD
;
2129 tf
.protocol
= ATA_PROT_NODATA
;
2132 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2133 ata_tf_to_host(ap
, &tf
);
2134 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2136 /* spec says at least 2ms. but who knows with those
2137 * crazy ATAPI devices...
2141 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2144 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2145 unsigned int devmask
)
2147 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2149 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2151 /* software reset. causes dev0 to be selected */
2152 if (ap
->flags
& ATA_FLAG_MMIO
) {
2153 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2154 udelay(20); /* FIXME: flush */
2155 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2156 udelay(20); /* FIXME: flush */
2157 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2159 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2161 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2163 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2166 /* spec mandates ">= 2ms" before checking status.
2167 * We wait 150ms, because that was the magic delay used for
2168 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2169 * between when the ATA command register is written, and then
2170 * status is checked. Because waiting for "a while" before
2171 * checking status is fine, post SRST, we perform this magic
2172 * delay here as well.
2176 ata_bus_post_reset(ap
, devmask
);
2182 * ata_bus_reset - reset host port and associated ATA channel
2183 * @ap: port to reset
2185 * This is typically the first time we actually start issuing
2186 * commands to the ATA channel. We wait for BSY to clear, then
2187 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2188 * result. Determine what devices, if any, are on the channel
2189 * by looking at the device 0/1 error register. Look at the signature
2190 * stored in each device's taskfile registers, to determine if
2191 * the device is ATA or ATAPI.
2194 * PCI/etc. bus probe sem.
2195 * Obtains host_set lock.
2198 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2201 void ata_bus_reset(struct ata_port
*ap
)
2203 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2204 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2206 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2208 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2210 /* determine if device 0/1 are present */
2211 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2214 dev0
= ata_devchk(ap
, 0);
2216 dev1
= ata_devchk(ap
, 1);
2220 devmask
|= (1 << 0);
2222 devmask
|= (1 << 1);
2224 /* select device 0 again */
2225 ap
->ops
->dev_select(ap
, 0);
2227 /* issue bus reset */
2228 if (ap
->flags
& ATA_FLAG_SRST
)
2229 rc
= ata_bus_softreset(ap
, devmask
);
2230 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2231 /* set up device control */
2232 if (ap
->flags
& ATA_FLAG_MMIO
)
2233 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2235 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2236 rc
= ata_bus_edd(ap
);
2243 * determine by signature whether we have ATA or ATAPI devices
2245 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2246 if ((slave_possible
) && (err
!= 0x81))
2247 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2249 /* re-enable interrupts */
2250 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2253 /* is double-select really necessary? */
2254 if (ap
->device
[1].class != ATA_DEV_NONE
)
2255 ap
->ops
->dev_select(ap
, 1);
2256 if (ap
->device
[0].class != ATA_DEV_NONE
)
2257 ap
->ops
->dev_select(ap
, 0);
2259 /* if no devices were detected, disable this port */
2260 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2261 (ap
->device
[1].class == ATA_DEV_NONE
))
2264 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2265 /* set up device control for ATA_FLAG_SATA_RESET */
2266 if (ap
->flags
& ATA_FLAG_MMIO
)
2267 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2269 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2276 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2277 ap
->ops
->port_disable(ap
);
2282 static int sata_phy_resume(struct ata_port
*ap
)
2284 unsigned long timeout
= jiffies
+ (HZ
* 5);
2287 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2289 /* Wait for phy to become ready, if necessary. */
2292 sstatus
= scr_read(ap
, SCR_STATUS
);
2293 if ((sstatus
& 0xf) != 1)
2295 } while (time_before(jiffies
, timeout
));
2301 * ata_std_probeinit - initialize probing
2302 * @ap: port to be probed
2304 * @ap is about to be probed. Initialize it. This function is
2305 * to be used as standard callback for ata_drive_probe_reset().
2307 extern void ata_std_probeinit(struct ata_port
*ap
)
2309 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2310 sata_phy_resume(ap
);
2314 * ata_std_softreset - reset host port via ATA SRST
2315 * @ap: port to reset
2316 * @verbose: fail verbosely
2317 * @classes: resulting classes of attached devices
2319 * Reset host port using ATA SRST. This function is to be used
2320 * as standard callback for ata_drive_*_reset() functions.
2323 * Kernel thread context (may sleep)
2326 * 0 on success, -errno otherwise.
2328 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2330 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2331 unsigned int devmask
= 0, err_mask
;
2336 /* determine if device 0/1 are present */
2337 if (ata_devchk(ap
, 0))
2338 devmask
|= (1 << 0);
2339 if (slave_possible
&& ata_devchk(ap
, 1))
2340 devmask
|= (1 << 1);
2342 /* devchk reports device presence without actual device on
2343 * most SATA controllers. Check SStatus and turn devmask off
2344 * if link is offline. Note that we should continue resetting
2345 * even when it seems like there's no device.
2347 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
))
2350 /* select device 0 again */
2351 ap
->ops
->dev_select(ap
, 0);
2353 /* issue bus reset */
2354 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2355 err_mask
= ata_bus_softreset(ap
, devmask
);
2358 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2361 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2366 /* determine by signature whether we have ATA or ATAPI devices */
2367 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2368 if (slave_possible
&& err
!= 0x81)
2369 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2371 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2376 * sata_std_hardreset - reset host port via SATA phy reset
2377 * @ap: port to reset
2378 * @verbose: fail verbosely
2379 * @class: resulting class of attached device
2381 * SATA phy-reset host port using DET bits of SControl register.
2382 * This function is to be used as standard callback for
2383 * ata_drive_*_reset().
2386 * Kernel thread context (may sleep)
2389 * 0 on success, -errno otherwise.
2391 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2397 /* Issue phy wake/reset */
2398 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2401 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2402 * 10.4.2 says at least 1 ms.
2406 /* Bring phy back */
2407 sata_phy_resume(ap
);
2410 serror
= scr_read(ap
, SCR_ERROR
);
2411 scr_write(ap
, SCR_ERROR
, serror
);
2413 /* TODO: phy layer with polling, timeouts, etc. */
2414 if (!sata_dev_present(ap
)) {
2415 *class = ATA_DEV_NONE
;
2416 DPRINTK("EXIT, link offline\n");
2420 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2422 printk(KERN_ERR
"ata%u: COMRESET failed "
2423 "(device not ready)\n", ap
->id
);
2425 DPRINTK("EXIT, device not ready\n");
2429 *class = ata_dev_try_classify(ap
, 0, NULL
);
2431 DPRINTK("EXIT, class=%u\n", *class);
2436 * ata_std_postreset - standard postreset callback
2437 * @ap: the target ata_port
2438 * @classes: classes of attached devices
2440 * This function is invoked after a successful reset. Note that
2441 * the device might have been reset more than once using
2442 * different reset methods before postreset is invoked.
2443 * postreset is also reponsible for setting cable type.
2445 * This function is to be used as standard callback for
2446 * ata_drive_*_reset().
2449 * Kernel thread context (may sleep)
2451 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2455 /* set cable type */
2456 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2457 ap
->cbl
= ATA_CBL_SATA
;
2459 /* print link status */
2460 if (ap
->cbl
== ATA_CBL_SATA
)
2461 sata_print_link_status(ap
);
2463 /* bail out if no device is present */
2464 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2465 DPRINTK("EXIT, no device\n");
2469 /* is double-select really necessary? */
2470 if (classes
[0] != ATA_DEV_NONE
)
2471 ap
->ops
->dev_select(ap
, 1);
2472 if (classes
[1] != ATA_DEV_NONE
)
2473 ap
->ops
->dev_select(ap
, 0);
2475 /* re-enable interrupts & set up device control */
2476 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2483 * ata_std_probe_reset - standard probe reset method
2484 * @ap: prot to perform probe-reset
2485 * @classes: resulting classes of attached devices
2487 * The stock off-the-shelf ->probe_reset method.
2490 * Kernel thread context (may sleep)
2493 * 0 on success, -errno otherwise.
2495 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2497 ata_reset_fn_t hardreset
;
2500 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2501 hardreset
= sata_std_hardreset
;
2503 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2504 ata_std_softreset
, hardreset
,
2505 ata_std_postreset
, classes
);
2508 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2509 ata_postreset_fn_t postreset
,
2510 unsigned int *classes
)
2514 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2515 classes
[i
] = ATA_DEV_UNKNOWN
;
2517 rc
= reset(ap
, 0, classes
);
2521 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2522 * is complete and convert all ATA_DEV_UNKNOWN to
2525 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2526 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2529 if (i
< ATA_MAX_DEVICES
)
2530 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2531 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2532 classes
[i
] = ATA_DEV_NONE
;
2535 postreset(ap
, classes
);
2537 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2541 * ata_drive_probe_reset - Perform probe reset with given methods
2542 * @ap: port to reset
2543 * @probeinit: probeinit method (can be NULL)
2544 * @softreset: softreset method (can be NULL)
2545 * @hardreset: hardreset method (can be NULL)
2546 * @postreset: postreset method (can be NULL)
2547 * @classes: resulting classes of attached devices
2549 * Reset the specified port and classify attached devices using
2550 * given methods. This function prefers softreset but tries all
2551 * possible reset sequences to reset and classify devices. This
2552 * function is intended to be used for constructing ->probe_reset
2553 * callback by low level drivers.
2555 * Reset methods should follow the following rules.
2557 * - Return 0 on sucess, -errno on failure.
2558 * - If classification is supported, fill classes[] with
2559 * recognized class codes.
2560 * - If classification is not supported, leave classes[] alone.
2561 * - If verbose is non-zero, print error message on failure;
2562 * otherwise, shut up.
2565 * Kernel thread context (may sleep)
2568 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2569 * if classification fails, and any error code from reset
2572 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2573 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2574 ata_postreset_fn_t postreset
, unsigned int *classes
)
2582 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2590 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2591 if (rc
== 0 || rc
!= -ENODEV
)
2595 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2600 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2601 const struct ata_device
*dev
)
2603 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2604 ap
->id
, dev
->devno
);
2607 static const char * const ata_dma_blacklist
[] = {
2626 "Toshiba CD-ROM XM-6202B",
2627 "TOSHIBA CD-ROM XM-1702BC",
2629 "E-IDE CD-ROM CR-840",
2632 "SAMSUNG CD-ROM SC-148C",
2633 "SAMSUNG CD-ROM SC",
2635 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2639 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2641 unsigned char model_num
[40];
2646 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2649 len
= strnlen(s
, sizeof(model_num
));
2651 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2652 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2657 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2658 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2664 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2666 const struct ata_device
*master
, *slave
;
2669 master
= &ap
->device
[0];
2670 slave
= &ap
->device
[1];
2672 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2674 if (shift
== ATA_SHIFT_UDMA
) {
2675 mask
= ap
->udma_mask
;
2676 if (ata_dev_present(master
)) {
2677 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2678 if (ata_dma_blacklisted(master
)) {
2680 ata_pr_blacklisted(ap
, master
);
2683 if (ata_dev_present(slave
)) {
2684 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2685 if (ata_dma_blacklisted(slave
)) {
2687 ata_pr_blacklisted(ap
, slave
);
2691 else if (shift
== ATA_SHIFT_MWDMA
) {
2692 mask
= ap
->mwdma_mask
;
2693 if (ata_dev_present(master
)) {
2694 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2695 if (ata_dma_blacklisted(master
)) {
2697 ata_pr_blacklisted(ap
, master
);
2700 if (ata_dev_present(slave
)) {
2701 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2702 if (ata_dma_blacklisted(slave
)) {
2704 ata_pr_blacklisted(ap
, slave
);
2708 else if (shift
== ATA_SHIFT_PIO
) {
2709 mask
= ap
->pio_mask
;
2710 if (ata_dev_present(master
)) {
2711 /* spec doesn't return explicit support for
2712 * PIO0-2, so we fake it
2714 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2719 if (ata_dev_present(slave
)) {
2720 /* spec doesn't return explicit support for
2721 * PIO0-2, so we fake it
2723 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2730 mask
= 0xffffffff; /* shut up compiler warning */
2737 /* find greatest bit */
2738 static int fgb(u32 bitmap
)
2743 for (i
= 0; i
< 32; i
++)
2744 if (bitmap
& (1 << i
))
2751 * ata_choose_xfer_mode - attempt to find best transfer mode
2752 * @ap: Port for which an xfer mode will be selected
2753 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2754 * @xfer_shift_out: (output) bit shift that selects this mode
2756 * Based on host and device capabilities, determine the
2757 * maximum transfer mode that is amenable to all.
2760 * PCI/etc. bus probe sem.
2763 * Zero on success, negative on error.
2766 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2768 unsigned int *xfer_shift_out
)
2770 unsigned int mask
, shift
;
2773 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2774 shift
= xfer_mode_classes
[i
].shift
;
2775 mask
= ata_get_mode_mask(ap
, shift
);
2779 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2780 *xfer_shift_out
= shift
;
2789 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2790 * @ap: Port associated with device @dev
2791 * @dev: Device to which command will be sent
2793 * Issue SET FEATURES - XFER MODE command to device @dev
2797 * PCI/etc. bus probe sem.
2800 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2802 struct ata_taskfile tf
;
2804 /* set up set-features taskfile */
2805 DPRINTK("set features - xfer mode\n");
2807 ata_tf_init(ap
, &tf
, dev
->devno
);
2808 tf
.command
= ATA_CMD_SET_FEATURES
;
2809 tf
.feature
= SETFEATURES_XFER
;
2810 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2811 tf
.protocol
= ATA_PROT_NODATA
;
2812 tf
.nsect
= dev
->xfer_mode
;
2814 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2815 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2817 ata_port_disable(ap
);
2824 * ata_dev_reread_id - Reread the device identify device info
2825 * @ap: port where the device is
2826 * @dev: device to reread the identify device info
2831 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2833 struct ata_taskfile tf
;
2835 ata_tf_init(ap
, &tf
, dev
->devno
);
2837 if (dev
->class == ATA_DEV_ATA
) {
2838 tf
.command
= ATA_CMD_ID_ATA
;
2839 DPRINTK("do ATA identify\n");
2841 tf
.command
= ATA_CMD_ID_ATAPI
;
2842 DPRINTK("do ATAPI identify\n");
2845 tf
.flags
|= ATA_TFLAG_DEVICE
;
2846 tf
.protocol
= ATA_PROT_PIO
;
2848 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2849 dev
->id
, sizeof(dev
->id
)))
2852 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2860 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2861 ata_port_disable(ap
);
2865 * ata_dev_init_params - Issue INIT DEV PARAMS command
2866 * @ap: Port associated with device @dev
2867 * @dev: Device to which command will be sent
2872 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2874 struct ata_taskfile tf
;
2875 u16 sectors
= dev
->id
[6];
2876 u16 heads
= dev
->id
[3];
2878 /* Number of sectors per track 1-255. Number of heads 1-16 */
2879 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2882 /* set up init dev params taskfile */
2883 DPRINTK("init dev params \n");
2885 ata_tf_init(ap
, &tf
, dev
->devno
);
2886 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2887 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2888 tf
.protocol
= ATA_PROT_NODATA
;
2890 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2892 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2893 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2895 ata_port_disable(ap
);
2902 * ata_sg_clean - Unmap DMA memory associated with command
2903 * @qc: Command containing DMA memory to be released
2905 * Unmap all mapped DMA memory associated with this command.
2908 * spin_lock_irqsave(host_set lock)
2911 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2913 struct ata_port
*ap
= qc
->ap
;
2914 struct scatterlist
*sg
= qc
->__sg
;
2915 int dir
= qc
->dma_dir
;
2916 void *pad_buf
= NULL
;
2918 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2921 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2922 assert(qc
->n_elem
== 1);
2924 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2926 /* if we padded the buffer out to 32-bit bound, and data
2927 * xfer direction is from-device, we must copy from the
2928 * pad buffer back into the supplied buffer
2930 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2931 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2933 if (qc
->flags
& ATA_QCFLAG_SG
) {
2935 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2936 /* restore last sg */
2937 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2939 struct scatterlist
*psg
= &qc
->pad_sgent
;
2940 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2941 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2942 kunmap_atomic(addr
, KM_IRQ0
);
2945 if (sg_dma_len(&sg
[0]) > 0)
2946 dma_unmap_single(ap
->host_set
->dev
,
2947 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2950 sg
->length
+= qc
->pad_len
;
2952 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2953 pad_buf
, qc
->pad_len
);
2956 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2961 * ata_fill_sg - Fill PCI IDE PRD table
2962 * @qc: Metadata associated with taskfile to be transferred
2964 * Fill PCI IDE PRD (scatter-gather) table with segments
2965 * associated with the current disk command.
2968 * spin_lock_irqsave(host_set lock)
2971 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2973 struct ata_port
*ap
= qc
->ap
;
2974 struct scatterlist
*sg
;
2977 assert(qc
->__sg
!= NULL
);
2978 assert(qc
->n_elem
> 0);
2981 ata_for_each_sg(sg
, qc
) {
2985 /* determine if physical DMA addr spans 64K boundary.
2986 * Note h/w doesn't support 64-bit, so we unconditionally
2987 * truncate dma_addr_t to u32.
2989 addr
= (u32
) sg_dma_address(sg
);
2990 sg_len
= sg_dma_len(sg
);
2993 offset
= addr
& 0xffff;
2995 if ((offset
+ sg_len
) > 0x10000)
2996 len
= 0x10000 - offset
;
2998 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2999 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3000 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3009 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3012 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3013 * @qc: Metadata associated with taskfile to check
3015 * Allow low-level driver to filter ATA PACKET commands, returning
3016 * a status indicating whether or not it is OK to use DMA for the
3017 * supplied PACKET command.
3020 * spin_lock_irqsave(host_set lock)
3022 * RETURNS: 0 when ATAPI DMA can be used
3025 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3027 struct ata_port
*ap
= qc
->ap
;
3028 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3030 if (ap
->ops
->check_atapi_dma
)
3031 rc
= ap
->ops
->check_atapi_dma(qc
);
3036 * ata_qc_prep - Prepare taskfile for submission
3037 * @qc: Metadata associated with taskfile to be prepared
3039 * Prepare ATA taskfile for submission.
3042 * spin_lock_irqsave(host_set lock)
3044 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3046 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3053 * ata_sg_init_one - Associate command with memory buffer
3054 * @qc: Command to be associated
3055 * @buf: Memory buffer
3056 * @buflen: Length of memory buffer, in bytes.
3058 * Initialize the data-related elements of queued_cmd @qc
3059 * to point to a single memory buffer, @buf of byte length @buflen.
3062 * spin_lock_irqsave(host_set lock)
3065 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3067 struct scatterlist
*sg
;
3069 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3071 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3072 qc
->__sg
= &qc
->sgent
;
3074 qc
->orig_n_elem
= 1;
3078 sg_init_one(sg
, buf
, buflen
);
3082 * ata_sg_init - Associate command with scatter-gather table.
3083 * @qc: Command to be associated
3084 * @sg: Scatter-gather table.
3085 * @n_elem: Number of elements in s/g table.
3087 * Initialize the data-related elements of queued_cmd @qc
3088 * to point to a scatter-gather table @sg, containing @n_elem
3092 * spin_lock_irqsave(host_set lock)
3095 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3096 unsigned int n_elem
)
3098 qc
->flags
|= ATA_QCFLAG_SG
;
3100 qc
->n_elem
= n_elem
;
3101 qc
->orig_n_elem
= n_elem
;
3105 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3106 * @qc: Command with memory buffer to be mapped.
3108 * DMA-map the memory buffer associated with queued_cmd @qc.
3111 * spin_lock_irqsave(host_set lock)
3114 * Zero on success, negative on error.
3117 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3119 struct ata_port
*ap
= qc
->ap
;
3120 int dir
= qc
->dma_dir
;
3121 struct scatterlist
*sg
= qc
->__sg
;
3122 dma_addr_t dma_address
;
3124 /* we must lengthen transfers to end on a 32-bit boundary */
3125 qc
->pad_len
= sg
->length
& 3;
3127 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3128 struct scatterlist
*psg
= &qc
->pad_sgent
;
3130 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
3132 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3134 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3135 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3138 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3139 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3141 sg
->length
-= qc
->pad_len
;
3143 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3144 sg
->length
, qc
->pad_len
);
3148 sg_dma_address(sg
) = 0;
3152 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
3154 if (dma_mapping_error(dma_address
)) {
3156 sg
->length
+= qc
->pad_len
;
3160 sg_dma_address(sg
) = dma_address
;
3162 sg_dma_len(sg
) = sg
->length
;
3164 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3165 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3171 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3172 * @qc: Command with scatter-gather table to be mapped.
3174 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3177 * spin_lock_irqsave(host_set lock)
3180 * Zero on success, negative on error.
3184 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3186 struct ata_port
*ap
= qc
->ap
;
3187 struct scatterlist
*sg
= qc
->__sg
;
3188 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3189 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3191 VPRINTK("ENTER, ata%u\n", ap
->id
);
3192 assert(qc
->flags
& ATA_QCFLAG_SG
);
3194 /* we must lengthen transfers to end on a 32-bit boundary */
3195 qc
->pad_len
= lsg
->length
& 3;
3197 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3198 struct scatterlist
*psg
= &qc
->pad_sgent
;
3199 unsigned int offset
;
3201 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
3203 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3206 * psg->page/offset are used to copy to-be-written
3207 * data in this function or read data in ata_sg_clean.
3209 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3210 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3211 psg
->offset
= offset_in_page(offset
);
3213 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3214 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3215 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3216 kunmap_atomic(addr
, KM_IRQ0
);
3219 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3220 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3222 lsg
->length
-= qc
->pad_len
;
3223 if (lsg
->length
== 0)
3226 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3227 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3230 pre_n_elem
= qc
->n_elem
;
3231 if (trim_sg
&& pre_n_elem
)
3240 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
3242 /* restore last sg */
3243 lsg
->length
+= qc
->pad_len
;
3247 DPRINTK("%d sg elements mapped\n", n_elem
);
3250 qc
->n_elem
= n_elem
;
3256 * ata_poll_qc_complete - turn irq back on and finish qc
3257 * @qc: Command to complete
3258 * @err_mask: ATA status register content
3261 * None. (grabs host lock)
3264 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3266 struct ata_port
*ap
= qc
->ap
;
3267 unsigned long flags
;
3269 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3271 ata_qc_complete(qc
);
3272 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3276 * ata_pio_poll - poll using PIO, depending on current state
3277 * @ap: the target ata_port
3280 * None. (executing in kernel thread context)
3283 * timeout value to use
3286 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3288 struct ata_queued_cmd
*qc
;
3290 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3291 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3293 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3296 switch (ap
->hsm_task_state
) {
3299 poll_state
= HSM_ST_POLL
;
3303 case HSM_ST_LAST_POLL
:
3304 poll_state
= HSM_ST_LAST_POLL
;
3305 reg_state
= HSM_ST_LAST
;
3312 status
= ata_chk_status(ap
);
3313 if (status
& ATA_BUSY
) {
3314 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3315 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3316 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3319 ap
->hsm_task_state
= poll_state
;
3320 return ATA_SHORT_PAUSE
;
3323 ap
->hsm_task_state
= reg_state
;
3328 * ata_pio_complete - check if drive is busy or idle
3329 * @ap: the target ata_port
3332 * None. (executing in kernel thread context)
3335 * Zero if qc completed.
3336 * Non-zero if has next.
3339 static int ata_pio_complete (struct ata_port
*ap
)
3341 struct ata_queued_cmd
*qc
;
3345 * This is purely heuristic. This is a fast path. Sometimes when
3346 * we enter, BSY will be cleared in a chk-status or two. If not,
3347 * the drive is probably seeking or something. Snooze for a couple
3348 * msecs, then chk-status again. If still busy, fall back to
3349 * HSM_ST_LAST_POLL state.
3351 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3352 if (drv_stat
& ATA_BUSY
) {
3354 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3355 if (drv_stat
& ATA_BUSY
) {
3356 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3357 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3362 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3365 drv_stat
= ata_wait_idle(ap
);
3366 if (!ata_ok(drv_stat
)) {
3367 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3368 ap
->hsm_task_state
= HSM_ST_ERR
;
3372 ap
->hsm_task_state
= HSM_ST_IDLE
;
3374 assert(qc
->err_mask
== 0);
3375 ata_poll_qc_complete(qc
);
3377 /* another command may start at this point */
3384 * swap_buf_le16 - swap halves of 16-bit words in place
3385 * @buf: Buffer to swap
3386 * @buf_words: Number of 16-bit words in buffer.
3388 * Swap halves of 16-bit words if needed to convert from
3389 * little-endian byte order to native cpu byte order, or
3393 * Inherited from caller.
3395 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3400 for (i
= 0; i
< buf_words
; i
++)
3401 buf
[i
] = le16_to_cpu(buf
[i
]);
3402 #endif /* __BIG_ENDIAN */
3406 * ata_mmio_data_xfer - Transfer data by MMIO
3407 * @ap: port to read/write
3409 * @buflen: buffer length
3410 * @write_data: read/write
3412 * Transfer data from/to the device data register by MMIO.
3415 * Inherited from caller.
3418 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3419 unsigned int buflen
, int write_data
)
3422 unsigned int words
= buflen
>> 1;
3423 u16
*buf16
= (u16
*) buf
;
3424 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3426 /* Transfer multiple of 2 bytes */
3428 for (i
= 0; i
< words
; i
++)
3429 writew(le16_to_cpu(buf16
[i
]), mmio
);
3431 for (i
= 0; i
< words
; i
++)
3432 buf16
[i
] = cpu_to_le16(readw(mmio
));
3435 /* Transfer trailing 1 byte, if any. */
3436 if (unlikely(buflen
& 0x01)) {
3437 u16 align_buf
[1] = { 0 };
3438 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3441 memcpy(align_buf
, trailing_buf
, 1);
3442 writew(le16_to_cpu(align_buf
[0]), mmio
);
3444 align_buf
[0] = cpu_to_le16(readw(mmio
));
3445 memcpy(trailing_buf
, align_buf
, 1);
3451 * ata_pio_data_xfer - Transfer data by PIO
3452 * @ap: port to read/write
3454 * @buflen: buffer length
3455 * @write_data: read/write
3457 * Transfer data from/to the device data register by PIO.
3460 * Inherited from caller.
3463 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3464 unsigned int buflen
, int write_data
)
3466 unsigned int words
= buflen
>> 1;
3468 /* Transfer multiple of 2 bytes */
3470 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3472 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3474 /* Transfer trailing 1 byte, if any. */
3475 if (unlikely(buflen
& 0x01)) {
3476 u16 align_buf
[1] = { 0 };
3477 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3480 memcpy(align_buf
, trailing_buf
, 1);
3481 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3483 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3484 memcpy(trailing_buf
, align_buf
, 1);
3490 * ata_data_xfer - Transfer data from/to the data register.
3491 * @ap: port to read/write
3493 * @buflen: buffer length
3494 * @do_write: read/write
3496 * Transfer data from/to the device data register.
3499 * Inherited from caller.
3502 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3503 unsigned int buflen
, int do_write
)
3505 /* Make the crap hardware pay the costs not the good stuff */
3506 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3507 unsigned long flags
;
3508 local_irq_save(flags
);
3509 if (ap
->flags
& ATA_FLAG_MMIO
)
3510 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3512 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3513 local_irq_restore(flags
);
3515 if (ap
->flags
& ATA_FLAG_MMIO
)
3516 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3518 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3523 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3524 * @qc: Command on going
3526 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3529 * Inherited from caller.
3532 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3534 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3535 struct scatterlist
*sg
= qc
->__sg
;
3536 struct ata_port
*ap
= qc
->ap
;
3538 unsigned int offset
;
3541 if (qc
->cursect
== (qc
->nsect
- 1))
3542 ap
->hsm_task_state
= HSM_ST_LAST
;
3544 page
= sg
[qc
->cursg
].page
;
3545 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3547 /* get the current page and offset */
3548 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3549 offset
%= PAGE_SIZE
;
3551 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3553 if (PageHighMem(page
)) {
3554 unsigned long flags
;
3556 local_irq_save(flags
);
3557 buf
= kmap_atomic(page
, KM_IRQ0
);
3559 /* do the actual data transfer */
3560 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3562 kunmap_atomic(buf
, KM_IRQ0
);
3563 local_irq_restore(flags
);
3565 buf
= page_address(page
);
3566 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3572 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3579 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3580 * @qc: Command on going
3582 * Transfer one or many ATA_SECT_SIZE of data from/to the
3583 * ATA device for the DRQ request.
3586 * Inherited from caller.
3589 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3591 if (is_multi_taskfile(&qc
->tf
)) {
3592 /* READ/WRITE MULTIPLE */
3595 assert(qc
->dev
->multi_count
);
3597 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3605 * atapi_send_cdb - Write CDB bytes to hardware
3606 * @ap: Port to which ATAPI device is attached.
3607 * @qc: Taskfile currently active
3609 * When device has indicated its readiness to accept
3610 * a CDB, this function is called. Send the CDB.
3616 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3619 DPRINTK("send cdb\n");
3620 assert(ap
->cdb_len
>= 12);
3622 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
3623 ata_altstatus(ap
); /* flush */
3625 switch (qc
->tf
.protocol
) {
3626 case ATA_PROT_ATAPI
:
3627 ap
->hsm_task_state
= HSM_ST
;
3629 case ATA_PROT_ATAPI_NODATA
:
3630 ap
->hsm_task_state
= HSM_ST_LAST
;
3632 case ATA_PROT_ATAPI_DMA
:
3633 ap
->hsm_task_state
= HSM_ST_LAST
;
3634 /* initiate bmdma */
3635 ap
->ops
->bmdma_start(qc
);
3641 * ata_pio_first_block - Write first data block to hardware
3642 * @ap: Port to which ATA/ATAPI device is attached.
3644 * When device has indicated its readiness to accept
3645 * the data, this function sends out the CDB or
3646 * the first data block by PIO.
3648 * - If polling, ata_pio_task() handles the rest.
3649 * - Otherwise, interrupt handler takes over.
3652 * Kernel thread context (may sleep)
3655 * Zero if irq handler takes over
3656 * Non-zero if has next (polling).
3659 static int ata_pio_first_block(struct ata_port
*ap
)
3661 struct ata_queued_cmd
*qc
;
3663 unsigned long flags
;
3666 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3668 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3670 /* if polling, we will stay in the work queue after sending the data.
3671 * otherwise, interrupt handler takes over after sending the data.
3673 has_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3675 /* sleep-wait for BSY to clear */
3676 DPRINTK("busy wait\n");
3677 if (ata_busy_sleep(ap
, ATA_TMOUT_DATAOUT_QUICK
, ATA_TMOUT_DATAOUT
)) {
3678 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3679 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3683 /* make sure DRQ is set */
3684 status
= ata_chk_status(ap
);
3685 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3686 /* device status error */
3687 qc
->err_mask
|= AC_ERR_HSM
;
3688 ap
->hsm_task_state
= HSM_ST_ERR
;
3692 /* Send the CDB (atapi) or the first data block (ata pio out).
3693 * During the state transition, interrupt handler shouldn't
3694 * be invoked before the data transfer is complete and
3695 * hsm_task_state is changed. Hence, the following locking.
3697 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3699 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
3700 /* PIO data out protocol.
3701 * send first data block.
3704 /* ata_pio_sectors() might change the state to HSM_ST_LAST.
3705 * so, the state is changed here before ata_pio_sectors().
3707 ap
->hsm_task_state
= HSM_ST
;
3708 ata_pio_sectors(qc
);
3709 ata_altstatus(ap
); /* flush */
3712 atapi_send_cdb(ap
, qc
);
3714 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3716 /* if polling, ata_pio_task() handles the rest.
3717 * otherwise, interrupt handler takes over from here.
3722 return 1; /* has next */
3726 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3727 * @qc: Command on going
3728 * @bytes: number of bytes
3730 * Transfer Transfer data from/to the ATAPI device.
3733 * Inherited from caller.
3737 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3739 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3740 struct scatterlist
*sg
= qc
->__sg
;
3741 struct ata_port
*ap
= qc
->ap
;
3744 unsigned int offset
, count
;
3746 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3747 ap
->hsm_task_state
= HSM_ST_LAST
;
3750 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3752 * The end of qc->sg is reached and the device expects
3753 * more data to transfer. In order not to overrun qc->sg
3754 * and fulfill length specified in the byte count register,
3755 * - for read case, discard trailing data from the device
3756 * - for write case, padding zero data to the device
3758 u16 pad_buf
[1] = { 0 };
3759 unsigned int words
= bytes
>> 1;
3762 if (words
) /* warning if bytes > 1 */
3763 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3766 for (i
= 0; i
< words
; i
++)
3767 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3769 ap
->hsm_task_state
= HSM_ST_LAST
;
3773 sg
= &qc
->__sg
[qc
->cursg
];
3776 offset
= sg
->offset
+ qc
->cursg_ofs
;
3778 /* get the current page and offset */
3779 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3780 offset
%= PAGE_SIZE
;
3782 /* don't overrun current sg */
3783 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3785 /* don't cross page boundaries */
3786 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3788 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3790 if (PageHighMem(page
)) {
3791 unsigned long flags
;
3793 local_irq_save(flags
);
3794 buf
= kmap_atomic(page
, KM_IRQ0
);
3796 /* do the actual data transfer */
3797 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3799 kunmap_atomic(buf
, KM_IRQ0
);
3800 local_irq_restore(flags
);
3802 buf
= page_address(page
);
3803 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3807 qc
->curbytes
+= count
;
3808 qc
->cursg_ofs
+= count
;
3810 if (qc
->cursg_ofs
== sg
->length
) {
3820 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3821 * @qc: Command on going
3823 * Transfer Transfer data from/to the ATAPI device.
3826 * Inherited from caller.
3829 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3831 struct ata_port
*ap
= qc
->ap
;
3832 struct ata_device
*dev
= qc
->dev
;
3833 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3834 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3836 ap
->ops
->tf_read(ap
, &qc
->tf
);
3837 ireason
= qc
->tf
.nsect
;
3838 bc_lo
= qc
->tf
.lbam
;
3839 bc_hi
= qc
->tf
.lbah
;
3840 bytes
= (bc_hi
<< 8) | bc_lo
;
3842 /* shall be cleared to zero, indicating xfer of data */
3843 if (ireason
& (1 << 0))
3846 /* make sure transfer direction matches expected */
3847 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3848 if (do_write
!= i_write
)
3851 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3853 __atapi_pio_bytes(qc
, bytes
);
3858 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3859 ap
->id
, dev
->devno
);
3860 qc
->err_mask
|= AC_ERR_HSM
;
3861 ap
->hsm_task_state
= HSM_ST_ERR
;
3865 * ata_pio_block - start PIO on a block
3866 * @ap: the target ata_port
3869 * None. (executing in kernel thread context)
3872 static void ata_pio_block(struct ata_port
*ap
)
3874 struct ata_queued_cmd
*qc
;
3878 * This is purely heuristic. This is a fast path.
3879 * Sometimes when we enter, BSY will be cleared in
3880 * a chk-status or two. If not, the drive is probably seeking
3881 * or something. Snooze for a couple msecs, then
3882 * chk-status again. If still busy, fall back to
3883 * HSM_ST_POLL state.
3885 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3886 if (status
& ATA_BUSY
) {
3888 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3889 if (status
& ATA_BUSY
) {
3890 ap
->hsm_task_state
= HSM_ST_POLL
;
3891 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3896 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3900 if (status
& (ATA_ERR
| ATA_DF
)) {
3901 qc
->err_mask
|= AC_ERR_DEV
;
3902 ap
->hsm_task_state
= HSM_ST_ERR
;
3906 /* transfer data if any */
3907 if (is_atapi_taskfile(&qc
->tf
)) {
3908 /* DRQ=0 means no more data to transfer */
3909 if ((status
& ATA_DRQ
) == 0) {
3910 ap
->hsm_task_state
= HSM_ST_LAST
;
3914 atapi_pio_bytes(qc
);
3916 /* handle BSY=0, DRQ=0 as error */
3917 if ((status
& ATA_DRQ
) == 0) {
3918 qc
->err_mask
|= AC_ERR_HSM
;
3919 ap
->hsm_task_state
= HSM_ST_ERR
;
3923 ata_pio_sectors(qc
);
3926 ata_altstatus(ap
); /* flush */
3929 static void ata_pio_error(struct ata_port
*ap
)
3931 struct ata_queued_cmd
*qc
;
3933 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3936 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3937 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3939 /* make sure qc->err_mask is available to
3940 * know what's wrong and recover
3942 assert(qc
->err_mask
);
3944 ap
->hsm_task_state
= HSM_ST_IDLE
;
3946 ata_poll_qc_complete(qc
);
3949 static void ata_pio_task(void *_data
)
3951 struct ata_port
*ap
= _data
;
3952 unsigned long timeout
;
3959 switch (ap
->hsm_task_state
) {
3961 has_next
= ata_pio_first_block(ap
);
3969 has_next
= ata_pio_complete(ap
);
3973 case HSM_ST_LAST_POLL
:
3974 timeout
= ata_pio_poll(ap
);
3988 ata_queue_delayed_pio_task(ap
, timeout
);
3994 * ata_qc_timeout - Handle timeout of queued command
3995 * @qc: Command that timed out
3997 * Some part of the kernel (currently, only the SCSI layer)
3998 * has noticed that the active command on port @ap has not
3999 * completed after a specified length of time. Handle this
4000 * condition by disabling DMA (if necessary) and completing
4001 * transactions, with error if necessary.
4003 * This also handles the case of the "lost interrupt", where
4004 * for some reason (possibly hardware bug, possibly driver bug)
4005 * an interrupt was not delivered to the driver, even though the
4006 * transaction completed successfully.
4009 * Inherited from SCSI layer (none, can sleep)
4012 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
4014 struct ata_port
*ap
= qc
->ap
;
4015 struct ata_host_set
*host_set
= ap
->host_set
;
4016 u8 host_stat
= 0, drv_stat
;
4017 unsigned long flags
;
4021 ata_flush_pio_tasks(ap
);
4022 ap
->hsm_task_state
= HSM_ST_IDLE
;
4024 spin_lock_irqsave(&host_set
->lock
, flags
);
4026 switch (qc
->tf
.protocol
) {
4029 case ATA_PROT_ATAPI_DMA
:
4030 host_stat
= ap
->ops
->bmdma_status(ap
);
4032 /* before we do anything else, clear DMA-Start bit */
4033 ap
->ops
->bmdma_stop(qc
);
4039 drv_stat
= ata_chk_status(ap
);
4041 /* ack bmdma irq events */
4042 ap
->ops
->irq_clear(ap
);
4044 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
4045 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
4047 ap
->hsm_task_state
= HSM_ST_IDLE
;
4049 /* complete taskfile transaction */
4050 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4054 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4056 ata_eh_qc_complete(qc
);
4062 * ata_eng_timeout - Handle timeout of queued command
4063 * @ap: Port on which timed-out command is active
4065 * Some part of the kernel (currently, only the SCSI layer)
4066 * has noticed that the active command on port @ap has not
4067 * completed after a specified length of time. Handle this
4068 * condition by disabling DMA (if necessary) and completing
4069 * transactions, with error if necessary.
4071 * This also handles the case of the "lost interrupt", where
4072 * for some reason (possibly hardware bug, possibly driver bug)
4073 * an interrupt was not delivered to the driver, even though the
4074 * transaction completed successfully.
4077 * Inherited from SCSI layer (none, can sleep)
4080 void ata_eng_timeout(struct ata_port
*ap
)
4082 struct ata_queued_cmd
*qc
;
4086 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4090 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
4100 * ata_qc_new - Request an available ATA command, for queueing
4101 * @ap: Port associated with device @dev
4102 * @dev: Device from whom we request an available command structure
4108 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4110 struct ata_queued_cmd
*qc
= NULL
;
4113 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4114 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4115 qc
= ata_qc_from_tag(ap
, i
);
4126 * ata_qc_new_init - Request an available ATA command, and initialize it
4127 * @ap: Port associated with device @dev
4128 * @dev: Device from whom we request an available command structure
4134 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4135 struct ata_device
*dev
)
4137 struct ata_queued_cmd
*qc
;
4139 qc
= ata_qc_new(ap
);
4152 * ata_qc_free - free unused ata_queued_cmd
4153 * @qc: Command to complete
4155 * Designed to free unused ata_queued_cmd object
4156 * in case something prevents using it.
4159 * spin_lock_irqsave(host_set lock)
4161 void ata_qc_free(struct ata_queued_cmd
*qc
)
4163 struct ata_port
*ap
= qc
->ap
;
4166 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
4170 if (likely(ata_tag_valid(tag
))) {
4171 if (tag
== ap
->active_tag
)
4172 ap
->active_tag
= ATA_TAG_POISON
;
4173 qc
->tag
= ATA_TAG_POISON
;
4174 clear_bit(tag
, &ap
->qactive
);
4179 * ata_qc_complete - Complete an active ATA command
4180 * @qc: Command to complete
4181 * @err_mask: ATA Status register contents
4183 * Indicate to the mid and upper layers that an ATA
4184 * command has completed, with either an ok or not-ok status.
4187 * spin_lock_irqsave(host_set lock)
4190 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4192 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
4193 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4195 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4198 /* atapi: mark qc as inactive to prevent the interrupt handler
4199 * from completing the command twice later, before the error handler
4200 * is called. (when rc != 0 and atapi request sense is needed)
4202 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4204 /* call completion callback */
4205 qc
->complete_fn(qc
);
4208 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4210 struct ata_port
*ap
= qc
->ap
;
4212 switch (qc
->tf
.protocol
) {
4214 case ATA_PROT_ATAPI_DMA
:
4217 case ATA_PROT_ATAPI
:
4219 case ATA_PROT_PIO_MULT
:
4220 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4233 * ata_qc_issue - issue taskfile to device
4234 * @qc: command to issue to device
4236 * Prepare an ATA command to submission to device.
4237 * This includes mapping the data into a DMA-able
4238 * area, filling in the S/G table, and finally
4239 * writing the taskfile to hardware, starting the command.
4242 * spin_lock_irqsave(host_set lock)
4245 * Zero on success, AC_ERR_* mask on failure
4248 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
4250 struct ata_port
*ap
= qc
->ap
;
4252 if (ata_should_dma_map(qc
)) {
4253 if (qc
->flags
& ATA_QCFLAG_SG
) {
4254 if (ata_sg_setup(qc
))
4256 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4257 if (ata_sg_setup_one(qc
))
4261 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4264 ap
->ops
->qc_prep(qc
);
4266 qc
->ap
->active_tag
= qc
->tag
;
4267 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4269 return ap
->ops
->qc_issue(qc
);
4272 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4273 return AC_ERR_SYSTEM
;
4278 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4279 * @qc: command to issue to device
4281 * Using various libata functions and hooks, this function
4282 * starts an ATA command. ATA commands are grouped into
4283 * classes called "protocols", and issuing each type of protocol
4284 * is slightly different.
4286 * May be used as the qc_issue() entry in ata_port_operations.
4289 * spin_lock_irqsave(host_set lock)
4292 * Zero on success, AC_ERR_* mask on failure
4295 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4297 struct ata_port
*ap
= qc
->ap
;
4299 /* Use polling pio if the LLD doesn't handle
4300 * interrupt driven pio and atapi CDB interrupt.
4302 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4303 switch (qc
->tf
.protocol
) {
4305 case ATA_PROT_ATAPI
:
4306 case ATA_PROT_ATAPI_NODATA
:
4307 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4309 case ATA_PROT_ATAPI_DMA
:
4310 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4318 /* select the device */
4319 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4321 /* start the command */
4322 switch (qc
->tf
.protocol
) {
4323 case ATA_PROT_NODATA
:
4324 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4325 ata_qc_set_polling(qc
);
4327 ata_tf_to_host(ap
, &qc
->tf
);
4328 ap
->hsm_task_state
= HSM_ST_LAST
;
4330 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4331 ata_queue_pio_task(ap
);
4336 assert(!(qc
->tf
.flags
& ATA_TFLAG_POLLING
));
4338 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4339 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4340 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4341 ap
->hsm_task_state
= HSM_ST_LAST
;
4345 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4346 ata_qc_set_polling(qc
);
4348 ata_tf_to_host(ap
, &qc
->tf
);
4350 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4351 /* PIO data out protocol */
4352 ap
->hsm_task_state
= HSM_ST_FIRST
;
4353 ata_queue_pio_task(ap
);
4355 /* always send first data block using
4356 * the ata_pio_task() codepath.
4359 /* PIO data in protocol */
4360 ap
->hsm_task_state
= HSM_ST
;
4362 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4363 ata_queue_pio_task(ap
);
4365 /* if polling, ata_pio_task() handles the rest.
4366 * otherwise, interrupt handler takes over from here.
4372 case ATA_PROT_ATAPI
:
4373 case ATA_PROT_ATAPI_NODATA
:
4374 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4375 ata_qc_set_polling(qc
);
4377 ata_tf_to_host(ap
, &qc
->tf
);
4379 ap
->hsm_task_state
= HSM_ST_FIRST
;
4381 /* send cdb by polling if no cdb interrupt */
4382 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4383 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4384 ata_queue_pio_task(ap
);
4387 case ATA_PROT_ATAPI_DMA
:
4388 assert(!(qc
->tf
.flags
& ATA_TFLAG_POLLING
));
4390 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4391 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4392 ap
->hsm_task_state
= HSM_ST_FIRST
;
4394 /* send cdb by polling if no cdb interrupt */
4395 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4396 ata_queue_pio_task(ap
);
4401 return AC_ERR_SYSTEM
;
4408 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4409 * @qc: Info associated with this ATA transaction.
4412 * spin_lock_irqsave(host_set lock)
4415 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
4417 struct ata_port
*ap
= qc
->ap
;
4418 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4420 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4422 /* load PRD table addr. */
4423 mb(); /* make sure PRD table writes are visible to controller */
4424 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
4426 /* specify data direction, triple-check start bit is clear */
4427 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4428 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4430 dmactl
|= ATA_DMA_WR
;
4431 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
4433 /* issue r/w command */
4434 ap
->ops
->exec_command(ap
, &qc
->tf
);
4438 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4439 * @qc: Info associated with this ATA transaction.
4442 * spin_lock_irqsave(host_set lock)
4445 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4447 struct ata_port
*ap
= qc
->ap
;
4448 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4451 /* start host DMA transaction */
4452 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4453 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4455 /* Strictly, one may wish to issue a readb() here, to
4456 * flush the mmio write. However, control also passes
4457 * to the hardware at this point, and it will interrupt
4458 * us when we are to resume control. So, in effect,
4459 * we don't care when the mmio write flushes.
4460 * Further, a read of the DMA status register _immediately_
4461 * following the write may not be what certain flaky hardware
4462 * is expected, so I think it is best to not add a readb()
4463 * without first all the MMIO ATA cards/mobos.
4464 * Or maybe I'm just being paranoid.
4469 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4470 * @qc: Info associated with this ATA transaction.
4473 * spin_lock_irqsave(host_set lock)
4476 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4478 struct ata_port
*ap
= qc
->ap
;
4479 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4482 /* load PRD table addr. */
4483 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4485 /* specify data direction, triple-check start bit is clear */
4486 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4487 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4489 dmactl
|= ATA_DMA_WR
;
4490 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4492 /* issue r/w command */
4493 ap
->ops
->exec_command(ap
, &qc
->tf
);
4497 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4498 * @qc: Info associated with this ATA transaction.
4501 * spin_lock_irqsave(host_set lock)
4504 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4506 struct ata_port
*ap
= qc
->ap
;
4509 /* start host DMA transaction */
4510 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4511 outb(dmactl
| ATA_DMA_START
,
4512 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4517 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4518 * @qc: Info associated with this ATA transaction.
4520 * Writes the ATA_DMA_START flag to the DMA command register.
4522 * May be used as the bmdma_start() entry in ata_port_operations.
4525 * spin_lock_irqsave(host_set lock)
4527 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4529 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4530 ata_bmdma_start_mmio(qc
);
4532 ata_bmdma_start_pio(qc
);
4537 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4538 * @qc: Info associated with this ATA transaction.
4540 * Writes address of PRD table to device's PRD Table Address
4541 * register, sets the DMA control register, and calls
4542 * ops->exec_command() to start the transfer.
4544 * May be used as the bmdma_setup() entry in ata_port_operations.
4547 * spin_lock_irqsave(host_set lock)
4549 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4551 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4552 ata_bmdma_setup_mmio(qc
);
4554 ata_bmdma_setup_pio(qc
);
4559 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4560 * @ap: Port associated with this ATA transaction.
4562 * Clear interrupt and error flags in DMA status register.
4564 * May be used as the irq_clear() entry in ata_port_operations.
4567 * spin_lock_irqsave(host_set lock)
4570 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4572 if (ap
->flags
& ATA_FLAG_MMIO
) {
4573 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4574 writeb(readb(mmio
), mmio
);
4576 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4577 outb(inb(addr
), addr
);
4584 * ata_bmdma_status - Read PCI IDE BMDMA status
4585 * @ap: Port associated with this ATA transaction.
4587 * Read and return BMDMA status register.
4589 * May be used as the bmdma_status() entry in ata_port_operations.
4592 * spin_lock_irqsave(host_set lock)
4595 u8
ata_bmdma_status(struct ata_port
*ap
)
4598 if (ap
->flags
& ATA_FLAG_MMIO
) {
4599 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4600 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4602 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4608 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4609 * @qc: Command we are ending DMA for
4611 * Clears the ATA_DMA_START flag in the dma control register
4613 * May be used as the bmdma_stop() entry in ata_port_operations.
4616 * spin_lock_irqsave(host_set lock)
4619 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4621 struct ata_port
*ap
= qc
->ap
;
4622 if (ap
->flags
& ATA_FLAG_MMIO
) {
4623 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4625 /* clear start/stop bit */
4626 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4627 mmio
+ ATA_DMA_CMD
);
4629 /* clear start/stop bit */
4630 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4631 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4634 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4635 ata_altstatus(ap
); /* dummy read */
4639 * ata_host_intr - Handle host interrupt for given (port, task)
4640 * @ap: Port on which interrupt arrived (possibly...)
4641 * @qc: Taskfile currently active in engine
4643 * Handle host interrupt for given queued command. Currently,
4644 * only DMA interrupts are handled. All other commands are
4645 * handled via polling with interrupts disabled (nIEN bit).
4648 * spin_lock_irqsave(host_set lock)
4651 * One if interrupt was handled, zero if not (shared irq).
4654 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4655 struct ata_queued_cmd
*qc
)
4657 u8 status
, host_stat
= 0;
4659 VPRINTK("ata%u: protocol %d task_state %d\n",
4660 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4662 /* Check whether we are expecting interrupt in this state */
4663 switch (ap
->hsm_task_state
) {
4665 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4666 * The flag was turned on only for atapi devices.
4667 * No need to check is_atapi_taskfile(&qc->tf) again.
4669 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4673 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4674 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4675 /* check status of DMA engine */
4676 host_stat
= ap
->ops
->bmdma_status(ap
);
4677 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4679 /* if it's not our irq... */
4680 if (!(host_stat
& ATA_DMA_INTR
))
4683 /* before we do anything else, clear DMA-Start bit */
4684 ap
->ops
->bmdma_stop(qc
);
4686 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4687 /* error when transfering data to/from memory */
4688 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4689 ap
->hsm_task_state
= HSM_ST_ERR
;
4699 /* check altstatus */
4700 status
= ata_altstatus(ap
);
4701 if (status
& ATA_BUSY
)
4704 /* check main status, clearing INTRQ */
4705 status
= ata_chk_status(ap
);
4706 if (unlikely(status
& ATA_BUSY
))
4709 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4710 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4712 /* ack bmdma irq events */
4713 ap
->ops
->irq_clear(ap
);
4716 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4717 qc
->err_mask
|= AC_ERR_DEV
;
4718 ap
->hsm_task_state
= HSM_ST_ERR
;
4722 switch (ap
->hsm_task_state
) {
4724 /* Some pre-ATAPI-4 devices assert INTRQ
4725 * at this state when ready to receive CDB.
4728 /* check device status */
4729 if (unlikely((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)) {
4730 /* Wrong status. Let EH handle this */
4731 qc
->err_mask
|= AC_ERR_HSM
;
4732 ap
->hsm_task_state
= HSM_ST_ERR
;
4736 atapi_send_cdb(ap
, qc
);
4741 /* complete command or read/write the data register */
4742 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4743 /* ATAPI PIO protocol */
4744 if ((status
& ATA_DRQ
) == 0) {
4745 /* no more data to transfer */
4746 ap
->hsm_task_state
= HSM_ST_LAST
;
4750 atapi_pio_bytes(qc
);
4752 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4753 /* bad ireason reported by device */
4757 /* ATA PIO protocol */
4758 if (unlikely((status
& ATA_DRQ
) == 0)) {
4759 /* handle BSY=0, DRQ=0 as error */
4760 qc
->err_mask
|= AC_ERR_HSM
;
4761 ap
->hsm_task_state
= HSM_ST_ERR
;
4765 ata_pio_sectors(qc
);
4767 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4768 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4771 status
= ata_chk_status(ap
);
4776 ata_altstatus(ap
); /* flush */
4780 if (unlikely(status
& ATA_DRQ
)) {
4781 /* handle DRQ=1 as error */
4782 qc
->err_mask
|= AC_ERR_HSM
;
4783 ap
->hsm_task_state
= HSM_ST_ERR
;
4787 /* no more data to transfer */
4788 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
4791 ap
->hsm_task_state
= HSM_ST_IDLE
;
4793 /* complete taskfile transaction */
4794 qc
->err_mask
|= ac_err_mask(status
);
4795 ata_qc_complete(qc
);
4799 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
4800 printk(KERN_ERR
"ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
4801 ap
->id
, status
, host_stat
);
4803 /* make sure qc->err_mask is available to
4804 * know what's wrong and recover
4806 assert(qc
->err_mask
);
4808 ap
->hsm_task_state
= HSM_ST_IDLE
;
4809 ata_qc_complete(qc
);
4815 return 1; /* irq handled */
4818 ap
->stats
.idle_irq
++;
4821 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4823 ata_irq_ack(ap
, 0); /* debug trap */
4824 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4827 return 0; /* irq not handled */
4831 * ata_interrupt - Default ATA host interrupt handler
4832 * @irq: irq line (unused)
4833 * @dev_instance: pointer to our ata_host_set information structure
4836 * Default interrupt handler for PCI IDE devices. Calls
4837 * ata_host_intr() for each port that is not disabled.
4840 * Obtains host_set lock during operation.
4843 * IRQ_NONE or IRQ_HANDLED.
4846 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4848 struct ata_host_set
*host_set
= dev_instance
;
4850 unsigned int handled
= 0;
4851 unsigned long flags
;
4853 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4854 spin_lock_irqsave(&host_set
->lock
, flags
);
4856 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4857 struct ata_port
*ap
;
4859 ap
= host_set
->ports
[i
];
4861 !(ap
->flags
& ATA_FLAG_PORT_DISABLED
)) {
4862 struct ata_queued_cmd
*qc
;
4864 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4865 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4866 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4867 handled
|= ata_host_intr(ap
, qc
);
4871 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4873 return IRQ_RETVAL(handled
);
4877 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4878 * without filling any other registers
4880 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4883 struct ata_taskfile tf
;
4886 ata_tf_init(ap
, &tf
, dev
->devno
);
4889 tf
.flags
|= ATA_TFLAG_DEVICE
;
4890 tf
.protocol
= ATA_PROT_NODATA
;
4892 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4894 printk(KERN_ERR
"%s: ata command failed: %d\n",
4900 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4904 if (!ata_try_flush_cache(dev
))
4907 if (ata_id_has_flush_ext(dev
->id
))
4908 cmd
= ATA_CMD_FLUSH_EXT
;
4910 cmd
= ATA_CMD_FLUSH
;
4912 return ata_do_simple_cmd(ap
, dev
, cmd
);
4915 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4917 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4920 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4922 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4926 * ata_device_resume - wakeup a previously suspended devices
4927 * @ap: port the device is connected to
4928 * @dev: the device to resume
4930 * Kick the drive back into action, by sending it an idle immediate
4931 * command and making sure its transfer mode matches between drive
4935 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4937 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4938 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4941 if (!ata_dev_present(dev
))
4943 if (dev
->class == ATA_DEV_ATA
)
4944 ata_start_drive(ap
, dev
);
4950 * ata_device_suspend - prepare a device for suspend
4951 * @ap: port the device is connected to
4952 * @dev: the device to suspend
4954 * Flush the cache on the drive, if appropriate, then issue a
4955 * standbynow command.
4957 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4959 if (!ata_dev_present(dev
))
4961 if (dev
->class == ATA_DEV_ATA
)
4962 ata_flush_cache(ap
, dev
);
4964 ata_standby_drive(ap
, dev
);
4965 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4970 * ata_port_start - Set port up for dma.
4971 * @ap: Port to initialize
4973 * Called just after data structures for each port are
4974 * initialized. Allocates space for PRD table.
4976 * May be used as the port_start() entry in ata_port_operations.
4979 * Inherited from caller.
4982 int ata_port_start (struct ata_port
*ap
)
4984 struct device
*dev
= ap
->host_set
->dev
;
4987 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4991 rc
= ata_pad_alloc(ap
, dev
);
4993 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4997 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5004 * ata_port_stop - Undo ata_port_start()
5005 * @ap: Port to shut down
5007 * Frees the PRD table.
5009 * May be used as the port_stop() entry in ata_port_operations.
5012 * Inherited from caller.
5015 void ata_port_stop (struct ata_port
*ap
)
5017 struct device
*dev
= ap
->host_set
->dev
;
5019 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5020 ata_pad_free(ap
, dev
);
5023 void ata_host_stop (struct ata_host_set
*host_set
)
5025 if (host_set
->mmio_base
)
5026 iounmap(host_set
->mmio_base
);
5031 * ata_host_remove - Unregister SCSI host structure with upper layers
5032 * @ap: Port to unregister
5033 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5036 * Inherited from caller.
5039 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5041 struct Scsi_Host
*sh
= ap
->host
;
5046 scsi_remove_host(sh
);
5048 ap
->ops
->port_stop(ap
);
5052 * ata_host_init - Initialize an ata_port structure
5053 * @ap: Structure to initialize
5054 * @host: associated SCSI mid-layer structure
5055 * @host_set: Collection of hosts to which @ap belongs
5056 * @ent: Probe information provided by low-level driver
5057 * @port_no: Port number associated with this ata_port
5059 * Initialize a new ata_port structure, and its associated
5063 * Inherited from caller.
5066 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5067 struct ata_host_set
*host_set
,
5068 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5074 host
->max_channel
= 1;
5075 host
->unique_id
= ata_unique_id
++;
5076 host
->max_cmd_len
= 12;
5078 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
5079 ap
->id
= host
->unique_id
;
5081 ap
->ctl
= ATA_DEVCTL_OBS
;
5082 ap
->host_set
= host_set
;
5083 ap
->port_no
= port_no
;
5085 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5086 ap
->pio_mask
= ent
->pio_mask
;
5087 ap
->mwdma_mask
= ent
->mwdma_mask
;
5088 ap
->udma_mask
= ent
->udma_mask
;
5089 ap
->flags
|= ent
->host_flags
;
5090 ap
->ops
= ent
->port_ops
;
5091 ap
->cbl
= ATA_CBL_NONE
;
5092 ap
->active_tag
= ATA_TAG_POISON
;
5093 ap
->last_ctl
= 0xFF;
5095 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
5096 INIT_LIST_HEAD(&ap
->eh_done_q
);
5098 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5099 ap
->device
[i
].devno
= i
;
5102 ap
->stats
.unhandled_irq
= 1;
5103 ap
->stats
.idle_irq
= 1;
5106 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5110 * ata_host_add - Attach low-level ATA driver to system
5111 * @ent: Information provided by low-level driver
5112 * @host_set: Collections of ports to which we add
5113 * @port_no: Port number associated with this host
5115 * Attach low-level ATA driver to system.
5118 * PCI/etc. bus probe sem.
5121 * New ata_port on success, for NULL on error.
5124 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5125 struct ata_host_set
*host_set
,
5126 unsigned int port_no
)
5128 struct Scsi_Host
*host
;
5129 struct ata_port
*ap
;
5133 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5137 ap
= (struct ata_port
*) &host
->hostdata
[0];
5139 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5141 rc
= ap
->ops
->port_start(ap
);
5148 scsi_host_put(host
);
5153 * ata_device_add - Register hardware device with ATA and SCSI layers
5154 * @ent: Probe information describing hardware device to be registered
5156 * This function processes the information provided in the probe
5157 * information struct @ent, allocates the necessary ATA and SCSI
5158 * host information structures, initializes them, and registers
5159 * everything with requisite kernel subsystems.
5161 * This function requests irqs, probes the ATA bus, and probes
5165 * PCI/etc. bus probe sem.
5168 * Number of ports registered. Zero on error (no ports registered).
5171 int ata_device_add(const struct ata_probe_ent
*ent
)
5173 unsigned int count
= 0, i
;
5174 struct device
*dev
= ent
->dev
;
5175 struct ata_host_set
*host_set
;
5178 /* alloc a container for our list of ATA ports (buses) */
5179 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5180 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5183 spin_lock_init(&host_set
->lock
);
5185 host_set
->dev
= dev
;
5186 host_set
->n_ports
= ent
->n_ports
;
5187 host_set
->irq
= ent
->irq
;
5188 host_set
->mmio_base
= ent
->mmio_base
;
5189 host_set
->private_data
= ent
->private_data
;
5190 host_set
->ops
= ent
->port_ops
;
5192 /* register each port bound to this device */
5193 for (i
= 0; i
< ent
->n_ports
; i
++) {
5194 struct ata_port
*ap
;
5195 unsigned long xfer_mode_mask
;
5197 ap
= ata_host_add(ent
, host_set
, i
);
5201 host_set
->ports
[i
] = ap
;
5202 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5203 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5204 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5206 /* print per-port info to dmesg */
5207 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
5208 "bmdma 0x%lX irq %lu\n",
5210 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5211 ata_mode_string(xfer_mode_mask
),
5212 ap
->ioaddr
.cmd_addr
,
5213 ap
->ioaddr
.ctl_addr
,
5214 ap
->ioaddr
.bmdma_addr
,
5218 host_set
->ops
->irq_clear(ap
);
5225 /* obtain irq, that is shared between channels */
5226 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5227 DRV_NAME
, host_set
))
5230 /* perform each probe synchronously */
5231 DPRINTK("probe begin\n");
5232 for (i
= 0; i
< count
; i
++) {
5233 struct ata_port
*ap
;
5236 ap
= host_set
->ports
[i
];
5238 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5239 rc
= ata_bus_probe(ap
);
5240 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5243 /* FIXME: do something useful here?
5244 * Current libata behavior will
5245 * tear down everything when
5246 * the module is removed
5247 * or the h/w is unplugged.
5251 rc
= scsi_add_host(ap
->host
, dev
);
5253 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
5255 /* FIXME: do something useful here */
5256 /* FIXME: handle unconditional calls to
5257 * scsi_scan_host and ata_host_remove, below,
5263 /* probes are done, now scan each port's disk(s) */
5264 DPRINTK("host probe begin\n");
5265 for (i
= 0; i
< count
; i
++) {
5266 struct ata_port
*ap
= host_set
->ports
[i
];
5268 ata_scsi_scan_host(ap
);
5271 dev_set_drvdata(dev
, host_set
);
5273 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5274 return ent
->n_ports
; /* success */
5277 for (i
= 0; i
< count
; i
++) {
5278 ata_host_remove(host_set
->ports
[i
], 1);
5279 scsi_host_put(host_set
->ports
[i
]->host
);
5283 VPRINTK("EXIT, returning 0\n");
5288 * ata_host_set_remove - PCI layer callback for device removal
5289 * @host_set: ATA host set that was removed
5291 * Unregister all objects associated with this host set. Free those
5295 * Inherited from calling layer (may sleep).
5298 void ata_host_set_remove(struct ata_host_set
*host_set
)
5300 struct ata_port
*ap
;
5303 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5304 ap
= host_set
->ports
[i
];
5305 scsi_remove_host(ap
->host
);
5308 free_irq(host_set
->irq
, host_set
);
5310 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5311 ap
= host_set
->ports
[i
];
5313 ata_scsi_release(ap
->host
);
5315 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5316 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5318 if (ioaddr
->cmd_addr
== 0x1f0)
5319 release_region(0x1f0, 8);
5320 else if (ioaddr
->cmd_addr
== 0x170)
5321 release_region(0x170, 8);
5324 scsi_host_put(ap
->host
);
5327 if (host_set
->ops
->host_stop
)
5328 host_set
->ops
->host_stop(host_set
);
5334 * ata_scsi_release - SCSI layer callback hook for host unload
5335 * @host: libata host to be unloaded
5337 * Performs all duties necessary to shut down a libata port...
5338 * Kill port kthread, disable port, and release resources.
5341 * Inherited from SCSI layer.
5347 int ata_scsi_release(struct Scsi_Host
*host
)
5349 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
5353 ap
->ops
->port_disable(ap
);
5354 ata_host_remove(ap
, 0);
5361 * ata_std_ports - initialize ioaddr with standard port offsets.
5362 * @ioaddr: IO address structure to be initialized
5364 * Utility function which initializes data_addr, error_addr,
5365 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5366 * device_addr, status_addr, and command_addr to standard offsets
5367 * relative to cmd_addr.
5369 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5372 void ata_std_ports(struct ata_ioports
*ioaddr
)
5374 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5375 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5376 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5377 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5378 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5379 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5380 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5381 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5382 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5383 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5386 static struct ata_probe_ent
*
5387 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
5389 struct ata_probe_ent
*probe_ent
;
5391 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
5393 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
5394 kobject_name(&(dev
->kobj
)));
5398 INIT_LIST_HEAD(&probe_ent
->node
);
5399 probe_ent
->dev
= dev
;
5401 probe_ent
->sht
= port
->sht
;
5402 probe_ent
->host_flags
= port
->host_flags
;
5403 probe_ent
->pio_mask
= port
->pio_mask
;
5404 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
5405 probe_ent
->udma_mask
= port
->udma_mask
;
5406 probe_ent
->port_ops
= port
->port_ops
;
5415 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5417 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5419 pci_iounmap(pdev
, host_set
->mmio_base
);
5423 * ata_pci_init_native_mode - Initialize native-mode driver
5424 * @pdev: pci device to be initialized
5425 * @port: array[2] of pointers to port info structures.
5426 * @ports: bitmap of ports present
5428 * Utility function which allocates and initializes an
5429 * ata_probe_ent structure for a standard dual-port
5430 * PIO-based IDE controller. The returned ata_probe_ent
5431 * structure can be passed to ata_device_add(). The returned
5432 * ata_probe_ent structure should then be freed with kfree().
5434 * The caller need only pass the address of the primary port, the
5435 * secondary will be deduced automatically. If the device has non
5436 * standard secondary port mappings this function can be called twice,
5437 * once for each interface.
5440 struct ata_probe_ent
*
5441 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
5443 struct ata_probe_ent
*probe_ent
=
5444 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
5450 probe_ent
->irq
= pdev
->irq
;
5451 probe_ent
->irq_flags
= SA_SHIRQ
;
5452 probe_ent
->private_data
= port
[0]->private_data
;
5454 if (ports
& ATA_PORT_PRIMARY
) {
5455 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
5456 probe_ent
->port
[p
].altstatus_addr
=
5457 probe_ent
->port
[p
].ctl_addr
=
5458 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
5459 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
5460 ata_std_ports(&probe_ent
->port
[p
]);
5464 if (ports
& ATA_PORT_SECONDARY
) {
5465 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
5466 probe_ent
->port
[p
].altstatus_addr
=
5467 probe_ent
->port
[p
].ctl_addr
=
5468 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
5469 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
5470 ata_std_ports(&probe_ent
->port
[p
]);
5474 probe_ent
->n_ports
= p
;
5478 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
, struct ata_port_info
*port
, int port_num
)
5480 struct ata_probe_ent
*probe_ent
;
5482 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
5486 probe_ent
->legacy_mode
= 1;
5487 probe_ent
->n_ports
= 1;
5488 probe_ent
->hard_port_no
= port_num
;
5489 probe_ent
->private_data
= port
->private_data
;
5494 probe_ent
->irq
= 14;
5495 probe_ent
->port
[0].cmd_addr
= 0x1f0;
5496 probe_ent
->port
[0].altstatus_addr
=
5497 probe_ent
->port
[0].ctl_addr
= 0x3f6;
5500 probe_ent
->irq
= 15;
5501 probe_ent
->port
[0].cmd_addr
= 0x170;
5502 probe_ent
->port
[0].altstatus_addr
=
5503 probe_ent
->port
[0].ctl_addr
= 0x376;
5506 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4) + 8 * port_num
;
5507 ata_std_ports(&probe_ent
->port
[0]);
5512 * ata_pci_init_one - Initialize/register PCI IDE host controller
5513 * @pdev: Controller to be initialized
5514 * @port_info: Information from low-level host driver
5515 * @n_ports: Number of ports attached to host controller
5517 * This is a helper function which can be called from a driver's
5518 * xxx_init_one() probe function if the hardware uses traditional
5519 * IDE taskfile registers.
5521 * This function calls pci_enable_device(), reserves its register
5522 * regions, sets the dma mask, enables bus master mode, and calls
5526 * Inherited from PCI layer (may sleep).
5529 * Zero on success, negative on errno-based value on error.
5532 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
5533 unsigned int n_ports
)
5535 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
5536 struct ata_port_info
*port
[2];
5538 unsigned int legacy_mode
= 0;
5539 int disable_dev_on_err
= 1;
5544 port
[0] = port_info
[0];
5546 port
[1] = port_info
[1];
5550 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
5551 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
5552 /* TODO: What if one channel is in native mode ... */
5553 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
5554 mask
= (1 << 2) | (1 << 0);
5555 if ((tmp8
& mask
) != mask
)
5556 legacy_mode
= (1 << 3);
5560 if ((!legacy_mode
) && (n_ports
> 2)) {
5561 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
5566 /* FIXME: Really for ATA it isn't safe because the device may be
5567 multi-purpose and we want to leave it alone if it was already
5568 enabled. Secondly for shared use as Arjan says we want refcounting
5570 Checking dev->is_enabled is insufficient as this is not set at
5571 boot for the primary video which is BIOS enabled
5574 rc
= pci_enable_device(pdev
);
5578 rc
= pci_request_regions(pdev
, DRV_NAME
);
5580 disable_dev_on_err
= 0;
5584 /* FIXME: Should use platform specific mappers for legacy port ranges */
5586 if (!request_region(0x1f0, 8, "libata")) {
5587 struct resource
*conflict
, res
;
5589 res
.end
= 0x1f0 + 8 - 1;
5590 conflict
= ____request_resource(&ioport_resource
, &res
);
5591 if (!strcmp(conflict
->name
, "libata"))
5592 legacy_mode
|= (1 << 0);
5594 disable_dev_on_err
= 0;
5595 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
5598 legacy_mode
|= (1 << 0);
5600 if (!request_region(0x170, 8, "libata")) {
5601 struct resource
*conflict
, res
;
5603 res
.end
= 0x170 + 8 - 1;
5604 conflict
= ____request_resource(&ioport_resource
, &res
);
5605 if (!strcmp(conflict
->name
, "libata"))
5606 legacy_mode
|= (1 << 1);
5608 disable_dev_on_err
= 0;
5609 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
5612 legacy_mode
|= (1 << 1);
5615 /* we have legacy mode, but all ports are unavailable */
5616 if (legacy_mode
== (1 << 3)) {
5618 goto err_out_regions
;
5621 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
5623 goto err_out_regions
;
5624 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
5626 goto err_out_regions
;
5629 if (legacy_mode
& (1 << 0))
5630 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
5631 if (legacy_mode
& (1 << 1))
5632 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
5635 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
5637 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
5639 if (!probe_ent
&& !probe_ent2
) {
5641 goto err_out_regions
;
5644 pci_set_master(pdev
);
5646 /* FIXME: check ata_device_add return */
5648 if (legacy_mode
& (1 << 0))
5649 ata_device_add(probe_ent
);
5650 if (legacy_mode
& (1 << 1))
5651 ata_device_add(probe_ent2
);
5653 ata_device_add(probe_ent
);
5661 if (legacy_mode
& (1 << 0))
5662 release_region(0x1f0, 8);
5663 if (legacy_mode
& (1 << 1))
5664 release_region(0x170, 8);
5665 pci_release_regions(pdev
);
5667 if (disable_dev_on_err
)
5668 pci_disable_device(pdev
);
5673 * ata_pci_remove_one - PCI layer callback for device removal
5674 * @pdev: PCI device that was removed
5676 * PCI layer indicates to libata via this hook that
5677 * hot-unplug or module unload event has occurred.
5678 * Handle this by unregistering all objects associated
5679 * with this PCI device. Free those objects. Then finally
5680 * release PCI resources and disable device.
5683 * Inherited from PCI layer (may sleep).
5686 void ata_pci_remove_one (struct pci_dev
*pdev
)
5688 struct device
*dev
= pci_dev_to_dev(pdev
);
5689 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5691 ata_host_set_remove(host_set
);
5692 pci_release_regions(pdev
);
5693 pci_disable_device(pdev
);
5694 dev_set_drvdata(dev
, NULL
);
5697 /* move to PCI subsystem */
5698 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5700 unsigned long tmp
= 0;
5702 switch (bits
->width
) {
5705 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5711 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5717 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5728 return (tmp
== bits
->val
) ? 1 : 0;
5731 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5733 pci_save_state(pdev
);
5734 pci_disable_device(pdev
);
5735 pci_set_power_state(pdev
, PCI_D3hot
);
5739 int ata_pci_device_resume(struct pci_dev
*pdev
)
5741 pci_set_power_state(pdev
, PCI_D0
);
5742 pci_restore_state(pdev
);
5743 pci_enable_device(pdev
);
5744 pci_set_master(pdev
);
5747 #endif /* CONFIG_PCI */
5750 static int __init
ata_init(void)
5752 ata_wq
= create_workqueue("ata");
5756 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5760 static void __exit
ata_exit(void)
5762 destroy_workqueue(ata_wq
);
5765 module_init(ata_init
);
5766 module_exit(ata_exit
);
5768 static unsigned long ratelimit_time
;
5769 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5771 int ata_ratelimit(void)
5774 unsigned long flags
;
5776 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5778 if (time_after(jiffies
, ratelimit_time
)) {
5780 ratelimit_time
= jiffies
+ (HZ
/5);
5784 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5790 * libata is essentially a library of internal helper functions for
5791 * low-level ATA host controller drivers. As such, the API/ABI is
5792 * likely to change as new drivers are added and updated.
5793 * Do not depend on ABI/API stability.
5796 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5797 EXPORT_SYMBOL_GPL(ata_std_ports
);
5798 EXPORT_SYMBOL_GPL(ata_device_add
);
5799 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5800 EXPORT_SYMBOL_GPL(ata_sg_init
);
5801 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5802 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5803 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5804 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5805 EXPORT_SYMBOL_GPL(ata_tf_load
);
5806 EXPORT_SYMBOL_GPL(ata_tf_read
);
5807 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5808 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5809 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5810 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5811 EXPORT_SYMBOL_GPL(ata_check_status
);
5812 EXPORT_SYMBOL_GPL(ata_altstatus
);
5813 EXPORT_SYMBOL_GPL(ata_exec_command
);
5814 EXPORT_SYMBOL_GPL(ata_port_start
);
5815 EXPORT_SYMBOL_GPL(ata_port_stop
);
5816 EXPORT_SYMBOL_GPL(ata_host_stop
);
5817 EXPORT_SYMBOL_GPL(ata_interrupt
);
5818 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5819 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5820 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5821 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5822 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5823 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5824 EXPORT_SYMBOL_GPL(ata_port_probe
);
5825 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5826 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5827 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5828 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5829 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5830 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5831 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5832 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5833 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5834 EXPORT_SYMBOL_GPL(ata_port_disable
);
5835 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5836 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5837 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5838 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5839 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5840 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5841 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5842 EXPORT_SYMBOL_GPL(ata_host_intr
);
5843 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5844 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
5845 EXPORT_SYMBOL_GPL(ata_dev_config
);
5846 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5847 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5848 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5850 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5851 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5852 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5855 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5856 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5857 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5858 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5859 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5860 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5861 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5862 #endif /* CONFIG_PCI */
5864 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5865 EXPORT_SYMBOL_GPL(ata_device_resume
);
5866 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5867 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);