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 <scsi/scsi.h>
53 #include "scsi_priv.h"
54 #include <scsi/scsi_host.h>
55 #include <linux/libata.h>
57 #include <asm/semaphore.h>
58 #include <asm/byteorder.h>
62 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
63 unsigned long tmout_pat
,
65 static void ata_set_mode(struct ata_port
*ap
);
66 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
67 static unsigned int ata_get_mode_mask(struct ata_port
*ap
, int shift
);
68 static int fgb(u32 bitmap
);
69 static int ata_choose_xfer_mode(struct ata_port
*ap
,
71 unsigned int *xfer_shift_out
);
72 static int ata_qc_complete_noop(struct ata_queued_cmd
*qc
, u8 drv_stat
);
73 static void __ata_qc_complete(struct ata_queued_cmd
*qc
);
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 - 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
, 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
, 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
, 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
, 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
, 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
, 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_exec - issue ATA command to host controller
296 * @ap: port to which command is being issued
297 * @tf: ATA taskfile register set
299 * Issues PIO/MMIO write to ATA command register, with proper
300 * synchronization with interrupt handler / other threads.
303 * Obtains host_set lock.
306 static inline void ata_exec(struct ata_port
*ap
, struct ata_taskfile
*tf
)
310 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
311 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
312 ap
->ops
->exec_command(ap
, tf
);
313 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
317 * ata_tf_to_host - issue ATA taskfile to host controller
318 * @ap: port to which command is being issued
319 * @tf: ATA taskfile register set
321 * Issues ATA taskfile register set to ATA host controller,
322 * with proper synchronization with interrupt handler and
326 * Obtains host_set lock.
329 static void ata_tf_to_host(struct ata_port
*ap
, struct ata_taskfile
*tf
)
331 ap
->ops
->tf_load(ap
, tf
);
337 * ata_tf_to_host_nolock - issue ATA taskfile to host controller
338 * @ap: port to which command is being issued
339 * @tf: ATA taskfile register set
341 * Issues ATA taskfile register set to ATA host controller,
342 * with proper synchronization with interrupt handler and
346 * spin_lock_irqsave(host_set lock)
349 void ata_tf_to_host_nolock(struct ata_port
*ap
, struct ata_taskfile
*tf
)
351 ap
->ops
->tf_load(ap
, tf
);
352 ap
->ops
->exec_command(ap
, tf
);
356 * ata_tf_read_pio - input device's ATA taskfile shadow registers
357 * @ap: Port from which input is read
358 * @tf: ATA taskfile register set for storing input
360 * Reads ATA taskfile registers for currently-selected device
364 * Inherited from caller.
367 static void ata_tf_read_pio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
369 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
371 tf
->nsect
= inb(ioaddr
->nsect_addr
);
372 tf
->lbal
= inb(ioaddr
->lbal_addr
);
373 tf
->lbam
= inb(ioaddr
->lbam_addr
);
374 tf
->lbah
= inb(ioaddr
->lbah_addr
);
375 tf
->device
= inb(ioaddr
->device_addr
);
377 if (tf
->flags
& ATA_TFLAG_LBA48
) {
378 outb(tf
->ctl
| ATA_HOB
, ioaddr
->ctl_addr
);
379 tf
->hob_feature
= inb(ioaddr
->error_addr
);
380 tf
->hob_nsect
= inb(ioaddr
->nsect_addr
);
381 tf
->hob_lbal
= inb(ioaddr
->lbal_addr
);
382 tf
->hob_lbam
= inb(ioaddr
->lbam_addr
);
383 tf
->hob_lbah
= inb(ioaddr
->lbah_addr
);
388 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
389 * @ap: Port from which input is read
390 * @tf: ATA taskfile register set for storing input
392 * Reads ATA taskfile registers for currently-selected device
396 * Inherited from caller.
399 static void ata_tf_read_mmio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
401 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
403 tf
->nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
404 tf
->lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
405 tf
->lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
406 tf
->lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
407 tf
->device
= readb((void __iomem
*)ioaddr
->device_addr
);
409 if (tf
->flags
& ATA_TFLAG_LBA48
) {
410 writeb(tf
->ctl
| ATA_HOB
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
411 tf
->hob_feature
= readb((void __iomem
*)ioaddr
->error_addr
);
412 tf
->hob_nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
413 tf
->hob_lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
414 tf
->hob_lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
415 tf
->hob_lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
421 * ata_tf_read - input device's ATA taskfile shadow registers
422 * @ap: Port from which input is read
423 * @tf: ATA taskfile register set for storing input
425 * Reads ATA taskfile registers for currently-selected device
428 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
429 * is set, also reads the hob registers.
431 * May be used as the tf_read() entry in ata_port_operations.
434 * Inherited from caller.
436 void ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
)
438 if (ap
->flags
& ATA_FLAG_MMIO
)
439 ata_tf_read_mmio(ap
, tf
);
441 ata_tf_read_pio(ap
, tf
);
445 * ata_check_status_pio - Read device status reg & clear interrupt
446 * @ap: port where the device is
448 * Reads ATA taskfile status register for currently-selected device
449 * and return its value. This also clears pending interrupts
453 * Inherited from caller.
455 static u8
ata_check_status_pio(struct ata_port
*ap
)
457 return inb(ap
->ioaddr
.status_addr
);
461 * ata_check_status_mmio - Read device status reg & clear interrupt
462 * @ap: port where the device is
464 * Reads ATA taskfile status register for currently-selected device
465 * via MMIO and return its value. This also clears pending interrupts
469 * Inherited from caller.
471 static u8
ata_check_status_mmio(struct ata_port
*ap
)
473 return readb((void __iomem
*) ap
->ioaddr
.status_addr
);
478 * ata_check_status - Read device status reg & clear interrupt
479 * @ap: port where the device is
481 * Reads ATA taskfile status register for currently-selected device
482 * and return its value. This also clears pending interrupts
485 * May be used as the check_status() entry in ata_port_operations.
488 * Inherited from caller.
490 u8
ata_check_status(struct ata_port
*ap
)
492 if (ap
->flags
& ATA_FLAG_MMIO
)
493 return ata_check_status_mmio(ap
);
494 return ata_check_status_pio(ap
);
499 * ata_altstatus - Read device alternate status reg
500 * @ap: port where the device is
502 * Reads ATA taskfile alternate status register for
503 * currently-selected device and return its value.
505 * Note: may NOT be used as the check_altstatus() entry in
506 * ata_port_operations.
509 * Inherited from caller.
511 u8
ata_altstatus(struct ata_port
*ap
)
513 if (ap
->ops
->check_altstatus
)
514 return ap
->ops
->check_altstatus(ap
);
516 if (ap
->flags
& ATA_FLAG_MMIO
)
517 return readb((void __iomem
*)ap
->ioaddr
.altstatus_addr
);
518 return inb(ap
->ioaddr
.altstatus_addr
);
523 * ata_chk_err - Read device error reg
524 * @ap: port where the device is
526 * Reads ATA taskfile error register for
527 * currently-selected device and return its value.
529 * Note: may NOT be used as the check_err() entry in
530 * ata_port_operations.
533 * Inherited from caller.
535 u8
ata_chk_err(struct ata_port
*ap
)
537 if (ap
->ops
->check_err
)
538 return ap
->ops
->check_err(ap
);
540 if (ap
->flags
& ATA_FLAG_MMIO
) {
541 return readb((void __iomem
*) ap
->ioaddr
.error_addr
);
543 return inb(ap
->ioaddr
.error_addr
);
547 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
548 * @tf: Taskfile to convert
549 * @fis: Buffer into which data will output
550 * @pmp: Port multiplier port
552 * Converts a standard ATA taskfile to a Serial ATA
553 * FIS structure (Register - Host to Device).
556 * Inherited from caller.
559 void ata_tf_to_fis(struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
561 fis
[0] = 0x27; /* Register - Host to Device FIS */
562 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
563 bit 7 indicates Command FIS */
564 fis
[2] = tf
->command
;
565 fis
[3] = tf
->feature
;
572 fis
[8] = tf
->hob_lbal
;
573 fis
[9] = tf
->hob_lbam
;
574 fis
[10] = tf
->hob_lbah
;
575 fis
[11] = tf
->hob_feature
;
578 fis
[13] = tf
->hob_nsect
;
589 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
590 * @fis: Buffer from which data will be input
591 * @tf: Taskfile to output
593 * Converts a standard ATA taskfile to a Serial ATA
594 * FIS structure (Register - Host to Device).
597 * Inherited from caller.
600 void ata_tf_from_fis(u8
*fis
, struct ata_taskfile
*tf
)
602 tf
->command
= fis
[2]; /* status */
603 tf
->feature
= fis
[3]; /* error */
610 tf
->hob_lbal
= fis
[8];
611 tf
->hob_lbam
= fis
[9];
612 tf
->hob_lbah
= fis
[10];
615 tf
->hob_nsect
= fis
[13];
619 * ata_prot_to_cmd - determine which read/write opcodes to use
620 * @protocol: ATA_PROT_xxx taskfile protocol
621 * @lba48: true is lba48 is present
623 * Given necessary input, determine which read/write commands
624 * to use to transfer data.
629 static int ata_prot_to_cmd(int protocol
, int lba48
)
631 int rcmd
= 0, wcmd
= 0;
636 rcmd
= ATA_CMD_PIO_READ_EXT
;
637 wcmd
= ATA_CMD_PIO_WRITE_EXT
;
639 rcmd
= ATA_CMD_PIO_READ
;
640 wcmd
= ATA_CMD_PIO_WRITE
;
646 rcmd
= ATA_CMD_READ_EXT
;
647 wcmd
= ATA_CMD_WRITE_EXT
;
650 wcmd
= ATA_CMD_WRITE
;
658 return rcmd
| (wcmd
<< 8);
662 * ata_dev_set_protocol - set taskfile protocol and r/w commands
663 * @dev: device to examine and configure
665 * Examine the device configuration, after we have
666 * read the identify-device page and configured the
667 * data transfer mode. Set internal state related to
668 * the ATA taskfile protocol (pio, pio mult, dma, etc.)
669 * and calculate the proper read/write commands to use.
674 static void ata_dev_set_protocol(struct ata_device
*dev
)
676 int pio
= (dev
->flags
& ATA_DFLAG_PIO
);
677 int lba48
= (dev
->flags
& ATA_DFLAG_LBA48
);
681 proto
= dev
->xfer_protocol
= ATA_PROT_PIO
;
683 proto
= dev
->xfer_protocol
= ATA_PROT_DMA
;
685 cmd
= ata_prot_to_cmd(proto
, lba48
);
689 dev
->read_cmd
= cmd
& 0xff;
690 dev
->write_cmd
= (cmd
>> 8) & 0xff;
693 static const char * xfer_mode_str
[] = {
713 * ata_udma_string - convert UDMA bit offset to string
714 * @mask: mask of bits supported; only highest bit counts.
716 * Determine string which represents the highest speed
717 * (highest bit in @udma_mask).
723 * Constant C string representing highest speed listed in
724 * @udma_mask, or the constant C string "<n/a>".
727 static const char *ata_mode_string(unsigned int mask
)
731 for (i
= 7; i
>= 0; i
--)
734 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
737 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
744 return xfer_mode_str
[i
];
748 * ata_pio_devchk - PATA device presence detection
749 * @ap: ATA channel to examine
750 * @device: Device to examine (starting at zero)
752 * This technique was originally described in
753 * Hale Landis's ATADRVR (www.ata-atapi.com), and
754 * later found its way into the ATA/ATAPI spec.
756 * Write a pattern to the ATA shadow registers,
757 * and if a device is present, it will respond by
758 * correctly storing and echoing back the
759 * ATA shadow register contents.
765 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
768 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
771 ap
->ops
->dev_select(ap
, device
);
773 outb(0x55, ioaddr
->nsect_addr
);
774 outb(0xaa, ioaddr
->lbal_addr
);
776 outb(0xaa, ioaddr
->nsect_addr
);
777 outb(0x55, ioaddr
->lbal_addr
);
779 outb(0x55, ioaddr
->nsect_addr
);
780 outb(0xaa, ioaddr
->lbal_addr
);
782 nsect
= inb(ioaddr
->nsect_addr
);
783 lbal
= inb(ioaddr
->lbal_addr
);
785 if ((nsect
== 0x55) && (lbal
== 0xaa))
786 return 1; /* we found a device */
788 return 0; /* nothing found */
792 * ata_mmio_devchk - PATA device presence detection
793 * @ap: ATA channel to examine
794 * @device: Device to examine (starting at zero)
796 * This technique was originally described in
797 * Hale Landis's ATADRVR (www.ata-atapi.com), and
798 * later found its way into the ATA/ATAPI spec.
800 * Write a pattern to the ATA shadow registers,
801 * and if a device is present, it will respond by
802 * correctly storing and echoing back the
803 * ATA shadow register contents.
809 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
812 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
815 ap
->ops
->dev_select(ap
, device
);
817 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
818 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
820 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
821 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
823 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
824 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
826 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
827 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
829 if ((nsect
== 0x55) && (lbal
== 0xaa))
830 return 1; /* we found a device */
832 return 0; /* nothing found */
836 * ata_devchk - PATA device presence detection
837 * @ap: ATA channel to examine
838 * @device: Device to examine (starting at zero)
840 * Dispatch ATA device presence detection, depending
841 * on whether we are using PIO or MMIO to talk to the
842 * ATA shadow registers.
848 static unsigned int ata_devchk(struct ata_port
*ap
,
851 if (ap
->flags
& ATA_FLAG_MMIO
)
852 return ata_mmio_devchk(ap
, device
);
853 return ata_pio_devchk(ap
, device
);
857 * ata_dev_classify - determine device type based on ATA-spec signature
858 * @tf: ATA taskfile register set for device to be identified
860 * Determine from taskfile register contents whether a device is
861 * ATA or ATAPI, as per "Signature and persistence" section
862 * of ATA/PI spec (volume 1, sect 5.14).
868 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
869 * the event of failure.
872 unsigned int ata_dev_classify(struct ata_taskfile
*tf
)
874 /* Apple's open source Darwin code hints that some devices only
875 * put a proper signature into the LBA mid/high registers,
876 * So, we only check those. It's sufficient for uniqueness.
879 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
880 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
881 DPRINTK("found ATA device by sig\n");
885 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
886 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
887 DPRINTK("found ATAPI device by sig\n");
888 return ATA_DEV_ATAPI
;
891 DPRINTK("unknown device\n");
892 return ATA_DEV_UNKNOWN
;
896 * ata_dev_try_classify - Parse returned ATA device signature
897 * @ap: ATA channel to examine
898 * @device: Device to examine (starting at zero)
900 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
901 * an ATA/ATAPI-defined set of values is placed in the ATA
902 * shadow registers, indicating the results of device detection
905 * Select the ATA device, and read the values from the ATA shadow
906 * registers. Then parse according to the Error register value,
907 * and the spec-defined values examined by ata_dev_classify().
913 static u8
ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
)
915 struct ata_device
*dev
= &ap
->device
[device
];
916 struct ata_taskfile tf
;
920 ap
->ops
->dev_select(ap
, device
);
922 memset(&tf
, 0, sizeof(tf
));
924 err
= ata_chk_err(ap
);
925 ap
->ops
->tf_read(ap
, &tf
);
927 dev
->class = ATA_DEV_NONE
;
929 /* see if device passed diags */
932 else if ((device
== 0) && (err
== 0x81))
937 /* determine if device if ATA or ATAPI */
938 class = ata_dev_classify(&tf
);
939 if (class == ATA_DEV_UNKNOWN
)
941 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
950 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
951 * @id: IDENTIFY DEVICE results we will examine
952 * @s: string into which data is output
953 * @ofs: offset into identify device page
954 * @len: length of string to return. must be an even number.
956 * The strings in the IDENTIFY DEVICE page are broken up into
957 * 16-bit chunks. Run through the string, and output each
958 * 8-bit chunk linearly, regardless of platform.
964 void ata_dev_id_string(u16
*id
, unsigned char *s
,
965 unsigned int ofs
, unsigned int len
)
985 * ata_noop_dev_select - Select device 0/1 on ATA bus
986 * @ap: ATA channel to manipulate
987 * @device: ATA device (numbered from zero) to select
989 * This function performs no actual function.
991 * May be used as the dev_select() entry in ata_port_operations.
996 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
1002 * ata_std_dev_select - Select device 0/1 on ATA bus
1003 * @ap: ATA channel to manipulate
1004 * @device: ATA device (numbered from zero) to select
1006 * Use the method defined in the ATA specification to
1007 * make either device 0, or device 1, active on the
1008 * ATA channel. Works with both PIO and MMIO.
1010 * May be used as the dev_select() entry in ata_port_operations.
1016 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
1021 tmp
= ATA_DEVICE_OBS
;
1023 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
1025 if (ap
->flags
& ATA_FLAG_MMIO
) {
1026 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
1028 outb(tmp
, ap
->ioaddr
.device_addr
);
1030 ata_pause(ap
); /* needed; also flushes, for mmio */
1034 * ata_dev_select - Select device 0/1 on ATA bus
1035 * @ap: ATA channel to manipulate
1036 * @device: ATA device (numbered from zero) to select
1037 * @wait: non-zero to wait for Status register BSY bit to clear
1038 * @can_sleep: non-zero if context allows sleeping
1040 * Use the method defined in the ATA specification to
1041 * make either device 0, or device 1, active on the
1044 * This is a high-level version of ata_std_dev_select(),
1045 * which additionally provides the services of inserting
1046 * the proper pauses and status polling, where needed.
1052 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
1053 unsigned int wait
, unsigned int can_sleep
)
1055 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
1056 ap
->id
, device
, wait
);
1061 ap
->ops
->dev_select(ap
, device
);
1064 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
1071 * ata_dump_id - IDENTIFY DEVICE info debugging output
1072 * @dev: Device whose IDENTIFY DEVICE page we will dump
1074 * Dump selected 16-bit words from a detected device's
1075 * IDENTIFY PAGE page.
1081 static inline void ata_dump_id(struct ata_device
*dev
)
1083 DPRINTK("49==0x%04x "
1093 DPRINTK("80==0x%04x "
1103 DPRINTK("88==0x%04x "
1110 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1111 * @ap: port on which device we wish to probe resides
1112 * @device: device bus address, starting at zero
1114 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1115 * command, and read back the 512-byte device information page.
1116 * The device information page is fed to us via the standard
1117 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1118 * using standard PIO-IN paths)
1120 * After reading the device information page, we use several
1121 * bits of information from it to initialize data structures
1122 * that will be used during the lifetime of the ata_device.
1123 * Other data from the info page is used to disqualify certain
1124 * older ATA devices we do not wish to support.
1127 * Inherited from caller. Some functions called by this function
1128 * obtain the host_set lock.
1131 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1133 struct ata_device
*dev
= &ap
->device
[device
];
1136 unsigned long xfer_modes
;
1138 unsigned int using_edd
;
1139 DECLARE_COMPLETION(wait
);
1140 struct ata_queued_cmd
*qc
;
1141 unsigned long flags
;
1144 if (!ata_dev_present(dev
)) {
1145 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1150 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1155 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1157 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1158 dev
->class == ATA_DEV_NONE
);
1160 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1162 qc
= ata_qc_new_init(ap
, dev
);
1165 ata_sg_init_one(qc
, dev
->id
, sizeof(dev
->id
));
1166 qc
->dma_dir
= DMA_FROM_DEVICE
;
1167 qc
->tf
.protocol
= ATA_PROT_PIO
;
1171 if (dev
->class == ATA_DEV_ATA
) {
1172 qc
->tf
.command
= ATA_CMD_ID_ATA
;
1173 DPRINTK("do ATA identify\n");
1175 qc
->tf
.command
= ATA_CMD_ID_ATAPI
;
1176 DPRINTK("do ATAPI identify\n");
1179 qc
->waiting
= &wait
;
1180 qc
->complete_fn
= ata_qc_complete_noop
;
1182 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1183 rc
= ata_qc_issue(qc
);
1184 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1189 wait_for_completion(&wait
);
1191 status
= ata_chk_status(ap
);
1192 if (status
& ATA_ERR
) {
1194 * arg! EDD works for all test cases, but seems to return
1195 * the ATA signature for some ATAPI devices. Until the
1196 * reason for this is found and fixed, we fix up the mess
1197 * here. If IDENTIFY DEVICE returns command aborted
1198 * (as ATAPI devices do), then we issue an
1199 * IDENTIFY PACKET DEVICE.
1201 * ATA software reset (SRST, the default) does not appear
1202 * to have this problem.
1204 if ((using_edd
) && (qc
->tf
.command
== ATA_CMD_ID_ATA
)) {
1205 u8 err
= ata_chk_err(ap
);
1206 if (err
& ATA_ABORTED
) {
1207 dev
->class = ATA_DEV_ATAPI
;
1218 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1220 /* print device capabilities */
1221 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1222 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1223 ap
->id
, device
, dev
->id
[49],
1224 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1225 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1229 * common ATA, ATAPI feature tests
1232 /* we require LBA and DMA support (bits 8 & 9 of word 49) */
1233 if (!ata_id_has_dma(dev
->id
) || !ata_id_has_lba(dev
->id
)) {
1234 printk(KERN_DEBUG
"ata%u: no dma/lba\n", ap
->id
);
1238 /* quick-n-dirty find max transfer mode; for printk only */
1239 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1241 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1243 xfer_modes
= (dev
->id
[ATA_ID_PIO_MODES
]) << (ATA_SHIFT_PIO
+ 3);
1244 xfer_modes
|= (0x7 << ATA_SHIFT_PIO
);
1249 /* ATA-specific feature tests */
1250 if (dev
->class == ATA_DEV_ATA
) {
1251 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1254 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1255 for (i
= 14; i
>= 1; i
--)
1259 /* we require at least ATA-3 */
1261 printk(KERN_DEBUG
"ata%u: no ATA-3\n", ap
->id
);
1265 if (ata_id_has_lba48(dev
->id
)) {
1266 dev
->flags
|= ATA_DFLAG_LBA48
;
1267 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1269 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1272 ap
->host
->max_cmd_len
= 16;
1274 /* print device info to dmesg */
1275 printk(KERN_INFO
"ata%u: dev %u ATA, max %s, %Lu sectors:%s\n",
1277 ata_mode_string(xfer_modes
),
1278 (unsigned long long)dev
->n_sectors
,
1279 dev
->flags
& ATA_DFLAG_LBA48
? " lba48" : "");
1282 /* ATAPI-specific feature tests */
1284 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1287 rc
= atapi_cdb_len(dev
->id
);
1288 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1289 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1292 ap
->cdb_len
= (unsigned int) rc
;
1293 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1295 /* print device info to dmesg */
1296 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1298 ata_mode_string(xfer_modes
));
1301 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1305 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1308 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1309 DPRINTK("EXIT, err\n");
1313 static inline u8
ata_dev_knobble(struct ata_port
*ap
)
1315 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1319 * ata_dev_config - Run device specific handlers and check for
1320 * SATA->PATA bridges
1327 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1329 /* limit bridge transfers to udma5, 200 sectors */
1330 if (ata_dev_knobble(ap
)) {
1331 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1332 ap
->id
, ap
->device
->devno
);
1333 ap
->udma_mask
&= ATA_UDMA5
;
1334 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1335 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1336 ap
->device
->flags
|= ATA_DFLAG_LOCK_SECTORS
;
1339 if (ap
->ops
->dev_config
)
1340 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1344 * ata_bus_probe - Reset and probe ATA bus
1347 * Master ATA bus probing function. Initiates a hardware-dependent
1348 * bus reset, then attempts to identify any devices found on
1352 * PCI/etc. bus probe sem.
1355 * Zero on success, non-zero on error.
1358 static int ata_bus_probe(struct ata_port
*ap
)
1360 unsigned int i
, found
= 0;
1362 ap
->ops
->phy_reset(ap
);
1363 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1366 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1367 ata_dev_identify(ap
, i
);
1368 if (ata_dev_present(&ap
->device
[i
])) {
1370 ata_dev_config(ap
,i
);
1374 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1375 goto err_out_disable
;
1378 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1379 goto err_out_disable
;
1384 ap
->ops
->port_disable(ap
);
1390 * ata_port_probe - Mark port as enabled
1391 * @ap: Port for which we indicate enablement
1393 * Modify @ap data structure such that the system
1394 * thinks that the entire port is enabled.
1396 * LOCKING: host_set lock, or some other form of
1400 void ata_port_probe(struct ata_port
*ap
)
1402 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1406 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1407 * @ap: SATA port associated with target SATA PHY.
1409 * This function issues commands to standard SATA Sxxx
1410 * PHY registers, to wake up the phy (and device), and
1411 * clear any reset condition.
1414 * PCI/etc. bus probe sem.
1417 void __sata_phy_reset(struct ata_port
*ap
)
1420 unsigned long timeout
= jiffies
+ (HZ
* 5);
1422 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1423 /* issue phy wake/reset */
1424 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1425 /* Couldn't find anything in SATA I/II specs, but
1426 * AHCI-1.1 10.4.2 says at least 1 ms. */
1429 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1431 /* wait for phy to become ready, if necessary */
1434 sstatus
= scr_read(ap
, SCR_STATUS
);
1435 if ((sstatus
& 0xf) != 1)
1437 } while (time_before(jiffies
, timeout
));
1439 /* TODO: phy layer with polling, timeouts, etc. */
1440 if (sata_dev_present(ap
))
1443 sstatus
= scr_read(ap
, SCR_STATUS
);
1444 printk(KERN_INFO
"ata%u: no device found (phy stat %08x)\n",
1446 ata_port_disable(ap
);
1449 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1452 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1453 ata_port_disable(ap
);
1457 ap
->cbl
= ATA_CBL_SATA
;
1461 * sata_phy_reset - Reset SATA bus.
1462 * @ap: SATA port associated with target SATA PHY.
1464 * This function resets the SATA bus, and then probes
1465 * the bus for devices.
1468 * PCI/etc. bus probe sem.
1471 void sata_phy_reset(struct ata_port
*ap
)
1473 __sata_phy_reset(ap
);
1474 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1480 * ata_port_disable - Disable port.
1481 * @ap: Port to be disabled.
1483 * Modify @ap data structure such that the system
1484 * thinks that the entire port is disabled, and should
1485 * never attempt to probe or communicate with devices
1488 * LOCKING: host_set lock, or some other form of
1492 void ata_port_disable(struct ata_port
*ap
)
1494 ap
->device
[0].class = ATA_DEV_NONE
;
1495 ap
->device
[1].class = ATA_DEV_NONE
;
1496 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1502 } xfer_mode_classes
[] = {
1503 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1504 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1505 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1508 static inline u8
base_from_shift(unsigned int shift
)
1512 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1513 if (xfer_mode_classes
[i
].shift
== shift
)
1514 return xfer_mode_classes
[i
].base
;
1519 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1524 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1527 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1528 dev
->flags
|= ATA_DFLAG_PIO
;
1530 ata_dev_set_xfermode(ap
, dev
);
1532 base
= base_from_shift(dev
->xfer_shift
);
1533 ofs
= dev
->xfer_mode
- base
;
1534 idx
= ofs
+ dev
->xfer_shift
;
1535 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1537 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1538 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1540 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1541 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1544 static int ata_host_set_pio(struct ata_port
*ap
)
1550 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1553 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1557 base
= base_from_shift(ATA_SHIFT_PIO
);
1558 xfer_mode
= base
+ x
;
1560 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1561 (int)base
, (int)xfer_mode
, mask
, x
);
1563 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1564 struct ata_device
*dev
= &ap
->device
[i
];
1565 if (ata_dev_present(dev
)) {
1566 dev
->pio_mode
= xfer_mode
;
1567 dev
->xfer_mode
= xfer_mode
;
1568 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1569 if (ap
->ops
->set_piomode
)
1570 ap
->ops
->set_piomode(ap
, dev
);
1577 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1578 unsigned int xfer_shift
)
1582 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1583 struct ata_device
*dev
= &ap
->device
[i
];
1584 if (ata_dev_present(dev
)) {
1585 dev
->dma_mode
= xfer_mode
;
1586 dev
->xfer_mode
= xfer_mode
;
1587 dev
->xfer_shift
= xfer_shift
;
1588 if (ap
->ops
->set_dmamode
)
1589 ap
->ops
->set_dmamode(ap
, dev
);
1595 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1596 * @ap: port on which timings will be programmed
1598 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1601 * PCI/etc. bus probe sem.
1604 static void ata_set_mode(struct ata_port
*ap
)
1606 unsigned int i
, xfer_shift
;
1610 /* step 1: always set host PIO timings */
1611 rc
= ata_host_set_pio(ap
);
1615 /* step 2: choose the best data xfer mode */
1616 xfer_mode
= xfer_shift
= 0;
1617 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1621 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1622 if (xfer_shift
!= ATA_SHIFT_PIO
)
1623 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1625 /* step 4: update devices' xfer mode */
1626 ata_dev_set_mode(ap
, &ap
->device
[0]);
1627 ata_dev_set_mode(ap
, &ap
->device
[1]);
1629 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1632 if (ap
->ops
->post_set_mode
)
1633 ap
->ops
->post_set_mode(ap
);
1635 for (i
= 0; i
< 2; i
++) {
1636 struct ata_device
*dev
= &ap
->device
[i
];
1637 ata_dev_set_protocol(dev
);
1643 ata_port_disable(ap
);
1647 * ata_busy_sleep - sleep until BSY clears, or timeout
1648 * @ap: port containing status register to be polled
1649 * @tmout_pat: impatience timeout
1650 * @tmout: overall timeout
1652 * Sleep until ATA Status register bit BSY clears,
1653 * or a timeout occurs.
1659 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
1660 unsigned long tmout_pat
,
1661 unsigned long tmout
)
1663 unsigned long timer_start
, timeout
;
1666 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1667 timer_start
= jiffies
;
1668 timeout
= timer_start
+ tmout_pat
;
1669 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1671 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1674 if (status
& ATA_BUSY
)
1675 printk(KERN_WARNING
"ata%u is slow to respond, "
1676 "please be patient\n", ap
->id
);
1678 timeout
= timer_start
+ tmout
;
1679 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1681 status
= ata_chk_status(ap
);
1684 if (status
& ATA_BUSY
) {
1685 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1686 ap
->id
, tmout
/ HZ
);
1693 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1695 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1696 unsigned int dev0
= devmask
& (1 << 0);
1697 unsigned int dev1
= devmask
& (1 << 1);
1698 unsigned long timeout
;
1700 /* if device 0 was found in ata_devchk, wait for its
1704 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1706 /* if device 1 was found in ata_devchk, wait for
1707 * register access, then wait for BSY to clear
1709 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1713 ap
->ops
->dev_select(ap
, 1);
1714 if (ap
->flags
& ATA_FLAG_MMIO
) {
1715 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1716 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1718 nsect
= inb(ioaddr
->nsect_addr
);
1719 lbal
= inb(ioaddr
->lbal_addr
);
1721 if ((nsect
== 1) && (lbal
== 1))
1723 if (time_after(jiffies
, timeout
)) {
1727 msleep(50); /* give drive a breather */
1730 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1732 /* is all this really necessary? */
1733 ap
->ops
->dev_select(ap
, 0);
1735 ap
->ops
->dev_select(ap
, 1);
1737 ap
->ops
->dev_select(ap
, 0);
1741 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1742 * @ap: Port to reset and probe
1744 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1745 * probe the bus. Not often used these days.
1748 * PCI/etc. bus probe sem.
1752 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1754 struct ata_taskfile tf
;
1756 /* set up execute-device-diag (bus reset) taskfile */
1757 /* also, take interrupts to a known state (disabled) */
1758 DPRINTK("execute-device-diag\n");
1759 ata_tf_init(ap
, &tf
, 0);
1761 tf
.command
= ATA_CMD_EDD
;
1762 tf
.protocol
= ATA_PROT_NODATA
;
1765 ata_tf_to_host(ap
, &tf
);
1767 /* spec says at least 2ms. but who knows with those
1768 * crazy ATAPI devices...
1772 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1775 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1776 unsigned int devmask
)
1778 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1780 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1782 /* software reset. causes dev0 to be selected */
1783 if (ap
->flags
& ATA_FLAG_MMIO
) {
1784 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1785 udelay(20); /* FIXME: flush */
1786 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1787 udelay(20); /* FIXME: flush */
1788 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1790 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1792 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1794 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1797 /* spec mandates ">= 2ms" before checking status.
1798 * We wait 150ms, because that was the magic delay used for
1799 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1800 * between when the ATA command register is written, and then
1801 * status is checked. Because waiting for "a while" before
1802 * checking status is fine, post SRST, we perform this magic
1803 * delay here as well.
1807 ata_bus_post_reset(ap
, devmask
);
1813 * ata_bus_reset - reset host port and associated ATA channel
1814 * @ap: port to reset
1816 * This is typically the first time we actually start issuing
1817 * commands to the ATA channel. We wait for BSY to clear, then
1818 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1819 * result. Determine what devices, if any, are on the channel
1820 * by looking at the device 0/1 error register. Look at the signature
1821 * stored in each device's taskfile registers, to determine if
1822 * the device is ATA or ATAPI.
1825 * PCI/etc. bus probe sem.
1826 * Obtains host_set lock.
1829 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1832 void ata_bus_reset(struct ata_port
*ap
)
1834 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1835 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
1837 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
1839 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
1841 /* determine if device 0/1 are present */
1842 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
1845 dev0
= ata_devchk(ap
, 0);
1847 dev1
= ata_devchk(ap
, 1);
1851 devmask
|= (1 << 0);
1853 devmask
|= (1 << 1);
1855 /* select device 0 again */
1856 ap
->ops
->dev_select(ap
, 0);
1858 /* issue bus reset */
1859 if (ap
->flags
& ATA_FLAG_SRST
)
1860 rc
= ata_bus_softreset(ap
, devmask
);
1861 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
1862 /* set up device control */
1863 if (ap
->flags
& ATA_FLAG_MMIO
)
1864 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1866 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1867 rc
= ata_bus_edd(ap
);
1874 * determine by signature whether we have ATA or ATAPI devices
1876 err
= ata_dev_try_classify(ap
, 0);
1877 if ((slave_possible
) && (err
!= 0x81))
1878 ata_dev_try_classify(ap
, 1);
1880 /* re-enable interrupts */
1881 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
1884 /* is double-select really necessary? */
1885 if (ap
->device
[1].class != ATA_DEV_NONE
)
1886 ap
->ops
->dev_select(ap
, 1);
1887 if (ap
->device
[0].class != ATA_DEV_NONE
)
1888 ap
->ops
->dev_select(ap
, 0);
1890 /* if no devices were detected, disable this port */
1891 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
1892 (ap
->device
[1].class == ATA_DEV_NONE
))
1895 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
1896 /* set up device control for ATA_FLAG_SATA_RESET */
1897 if (ap
->flags
& ATA_FLAG_MMIO
)
1898 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1900 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1907 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
1908 ap
->ops
->port_disable(ap
);
1913 static void ata_pr_blacklisted(struct ata_port
*ap
, struct ata_device
*dev
)
1915 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
1916 ap
->id
, dev
->devno
);
1919 static const char * ata_dma_blacklist
[] = {
1938 "Toshiba CD-ROM XM-6202B",
1939 "TOSHIBA CD-ROM XM-1702BC",
1941 "E-IDE CD-ROM CR-840",
1944 "SAMSUNG CD-ROM SC-148C",
1945 "SAMSUNG CD-ROM SC",
1947 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
1951 static int ata_dma_blacklisted(struct ata_port
*ap
, struct ata_device
*dev
)
1953 unsigned char model_num
[40];
1958 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
1961 len
= strnlen(s
, sizeof(model_num
));
1963 /* ATAPI specifies that empty space is blank-filled; remove blanks */
1964 while ((len
> 0) && (s
[len
- 1] == ' ')) {
1969 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
1970 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
1976 static unsigned int ata_get_mode_mask(struct ata_port
*ap
, int shift
)
1978 struct ata_device
*master
, *slave
;
1981 master
= &ap
->device
[0];
1982 slave
= &ap
->device
[1];
1984 assert (ata_dev_present(master
) || ata_dev_present(slave
));
1986 if (shift
== ATA_SHIFT_UDMA
) {
1987 mask
= ap
->udma_mask
;
1988 if (ata_dev_present(master
)) {
1989 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
1990 if (ata_dma_blacklisted(ap
, master
)) {
1992 ata_pr_blacklisted(ap
, master
);
1995 if (ata_dev_present(slave
)) {
1996 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
1997 if (ata_dma_blacklisted(ap
, slave
)) {
1999 ata_pr_blacklisted(ap
, slave
);
2003 else if (shift
== ATA_SHIFT_MWDMA
) {
2004 mask
= ap
->mwdma_mask
;
2005 if (ata_dev_present(master
)) {
2006 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2007 if (ata_dma_blacklisted(ap
, master
)) {
2009 ata_pr_blacklisted(ap
, master
);
2012 if (ata_dev_present(slave
)) {
2013 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2014 if (ata_dma_blacklisted(ap
, slave
)) {
2016 ata_pr_blacklisted(ap
, slave
);
2020 else if (shift
== ATA_SHIFT_PIO
) {
2021 mask
= ap
->pio_mask
;
2022 if (ata_dev_present(master
)) {
2023 /* spec doesn't return explicit support for
2024 * PIO0-2, so we fake it
2026 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2031 if (ata_dev_present(slave
)) {
2032 /* spec doesn't return explicit support for
2033 * PIO0-2, so we fake it
2035 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2042 mask
= 0xffffffff; /* shut up compiler warning */
2049 /* find greatest bit */
2050 static int fgb(u32 bitmap
)
2055 for (i
= 0; i
< 32; i
++)
2056 if (bitmap
& (1 << i
))
2063 * ata_choose_xfer_mode - attempt to find best transfer mode
2064 * @ap: Port for which an xfer mode will be selected
2065 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2066 * @xfer_shift_out: (output) bit shift that selects this mode
2068 * Based on host and device capabilities, determine the
2069 * maximum transfer mode that is amenable to all.
2072 * PCI/etc. bus probe sem.
2075 * Zero on success, negative on error.
2078 static int ata_choose_xfer_mode(struct ata_port
*ap
,
2080 unsigned int *xfer_shift_out
)
2082 unsigned int mask
, shift
;
2085 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2086 shift
= xfer_mode_classes
[i
].shift
;
2087 mask
= ata_get_mode_mask(ap
, shift
);
2091 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2092 *xfer_shift_out
= shift
;
2101 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2102 * @ap: Port associated with device @dev
2103 * @dev: Device to which command will be sent
2105 * Issue SET FEATURES - XFER MODE command to device @dev
2109 * PCI/etc. bus probe sem.
2112 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2114 DECLARE_COMPLETION(wait
);
2115 struct ata_queued_cmd
*qc
;
2117 unsigned long flags
;
2119 /* set up set-features taskfile */
2120 DPRINTK("set features - xfer mode\n");
2122 qc
= ata_qc_new_init(ap
, dev
);
2125 qc
->tf
.command
= ATA_CMD_SET_FEATURES
;
2126 qc
->tf
.feature
= SETFEATURES_XFER
;
2127 qc
->tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2128 qc
->tf
.protocol
= ATA_PROT_NODATA
;
2129 qc
->tf
.nsect
= dev
->xfer_mode
;
2131 qc
->waiting
= &wait
;
2132 qc
->complete_fn
= ata_qc_complete_noop
;
2134 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2135 rc
= ata_qc_issue(qc
);
2136 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2139 ata_port_disable(ap
);
2141 wait_for_completion(&wait
);
2147 * ata_sg_clean - Unmap DMA memory associated with command
2148 * @qc: Command containing DMA memory to be released
2150 * Unmap all mapped DMA memory associated with this command.
2153 * spin_lock_irqsave(host_set lock)
2156 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2158 struct ata_port
*ap
= qc
->ap
;
2159 struct scatterlist
*sg
= qc
->sg
;
2160 int dir
= qc
->dma_dir
;
2162 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2165 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2166 assert(qc
->n_elem
== 1);
2168 DPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2170 if (qc
->flags
& ATA_QCFLAG_SG
)
2171 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2173 dma_unmap_single(ap
->host_set
->dev
, sg_dma_address(&sg
[0]),
2174 sg_dma_len(&sg
[0]), dir
);
2176 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2181 * ata_fill_sg - Fill PCI IDE PRD table
2182 * @qc: Metadata associated with taskfile to be transferred
2184 * Fill PCI IDE PRD (scatter-gather) table with segments
2185 * associated with the current disk command.
2188 * spin_lock_irqsave(host_set lock)
2191 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2193 struct scatterlist
*sg
= qc
->sg
;
2194 struct ata_port
*ap
= qc
->ap
;
2195 unsigned int idx
, nelem
;
2198 assert(qc
->n_elem
> 0);
2201 for (nelem
= qc
->n_elem
; nelem
; nelem
--,sg
++) {
2205 /* determine if physical DMA addr spans 64K boundary.
2206 * Note h/w doesn't support 64-bit, so we unconditionally
2207 * truncate dma_addr_t to u32.
2209 addr
= (u32
) sg_dma_address(sg
);
2210 sg_len
= sg_dma_len(sg
);
2213 offset
= addr
& 0xffff;
2215 if ((offset
+ sg_len
) > 0x10000)
2216 len
= 0x10000 - offset
;
2218 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2219 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2220 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2229 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2232 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2233 * @qc: Metadata associated with taskfile to check
2235 * Allow low-level driver to filter ATA PACKET commands, returning
2236 * a status indicating whether or not it is OK to use DMA for the
2237 * supplied PACKET command.
2240 * spin_lock_irqsave(host_set lock)
2242 * RETURNS: 0 when ATAPI DMA can be used
2245 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2247 struct ata_port
*ap
= qc
->ap
;
2248 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2250 if (ap
->ops
->check_atapi_dma
)
2251 rc
= ap
->ops
->check_atapi_dma(qc
);
2256 * ata_qc_prep - Prepare taskfile for submission
2257 * @qc: Metadata associated with taskfile to be prepared
2259 * Prepare ATA taskfile for submission.
2262 * spin_lock_irqsave(host_set lock)
2264 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2266 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2273 * ata_sg_init_one - Associate command with memory buffer
2274 * @qc: Command to be associated
2275 * @buf: Memory buffer
2276 * @buflen: Length of memory buffer, in bytes.
2278 * Initialize the data-related elements of queued_cmd @qc
2279 * to point to a single memory buffer, @buf of byte length @buflen.
2282 * spin_lock_irqsave(host_set lock)
2285 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2287 struct scatterlist
*sg
;
2289 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2291 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2292 qc
->sg
= &qc
->sgent
;
2297 sg
->page
= virt_to_page(buf
);
2298 sg
->offset
= (unsigned long) buf
& ~PAGE_MASK
;
2299 sg
->length
= buflen
;
2303 * ata_sg_init - Associate command with scatter-gather table.
2304 * @qc: Command to be associated
2305 * @sg: Scatter-gather table.
2306 * @n_elem: Number of elements in s/g table.
2308 * Initialize the data-related elements of queued_cmd @qc
2309 * to point to a scatter-gather table @sg, containing @n_elem
2313 * spin_lock_irqsave(host_set lock)
2316 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2317 unsigned int n_elem
)
2319 qc
->flags
|= ATA_QCFLAG_SG
;
2321 qc
->n_elem
= n_elem
;
2325 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2326 * @qc: Command with memory buffer to be mapped.
2328 * DMA-map the memory buffer associated with queued_cmd @qc.
2331 * spin_lock_irqsave(host_set lock)
2334 * Zero on success, negative on error.
2337 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2339 struct ata_port
*ap
= qc
->ap
;
2340 int dir
= qc
->dma_dir
;
2341 struct scatterlist
*sg
= qc
->sg
;
2342 dma_addr_t dma_address
;
2344 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2346 if (dma_mapping_error(dma_address
))
2349 sg_dma_address(sg
) = dma_address
;
2350 sg_dma_len(sg
) = sg
->length
;
2352 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2353 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2359 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2360 * @qc: Command with scatter-gather table to be mapped.
2362 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2365 * spin_lock_irqsave(host_set lock)
2368 * Zero on success, negative on error.
2372 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2374 struct ata_port
*ap
= qc
->ap
;
2375 struct scatterlist
*sg
= qc
->sg
;
2378 VPRINTK("ENTER, ata%u\n", ap
->id
);
2379 assert(qc
->flags
& ATA_QCFLAG_SG
);
2382 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2386 DPRINTK("%d sg elements mapped\n", n_elem
);
2388 qc
->n_elem
= n_elem
;
2394 * ata_poll_qc_complete - turn irq back on and finish qc
2395 * @qc: Command to complete
2396 * @drv_stat: ATA status register content
2399 * None. (grabs host lock)
2402 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
, u8 drv_stat
)
2404 struct ata_port
*ap
= qc
->ap
;
2405 unsigned long flags
;
2407 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2408 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2410 ata_qc_complete(qc
, drv_stat
);
2411 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2419 * None. (executing in kernel thread context)
2425 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2428 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2429 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2430 const unsigned int tmout_state
= HSM_ST_TMOUT
;
2432 switch (ap
->hsm_task_state
) {
2435 poll_state
= HSM_ST_POLL
;
2439 case HSM_ST_LAST_POLL
:
2440 poll_state
= HSM_ST_LAST_POLL
;
2441 reg_state
= HSM_ST_LAST
;
2448 status
= ata_chk_status(ap
);
2449 if (status
& ATA_BUSY
) {
2450 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2451 ap
->hsm_task_state
= tmout_state
;
2454 ap
->hsm_task_state
= poll_state
;
2455 return ATA_SHORT_PAUSE
;
2458 ap
->hsm_task_state
= reg_state
;
2463 * ata_pio_complete -
2467 * None. (executing in kernel thread context)
2470 * Non-zero if qc completed, zero otherwise.
2473 static int ata_pio_complete (struct ata_port
*ap
)
2475 struct ata_queued_cmd
*qc
;
2479 * This is purely heuristic. This is a fast path. Sometimes when
2480 * we enter, BSY will be cleared in a chk-status or two. If not,
2481 * the drive is probably seeking or something. Snooze for a couple
2482 * msecs, then chk-status again. If still busy, fall back to
2483 * HSM_ST_POLL state.
2485 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 10);
2486 if (drv_stat
& (ATA_BUSY
| ATA_DRQ
)) {
2488 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 10);
2489 if (drv_stat
& (ATA_BUSY
| ATA_DRQ
)) {
2490 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2491 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2496 drv_stat
= ata_wait_idle(ap
);
2497 if (!ata_ok(drv_stat
)) {
2498 ap
->hsm_task_state
= HSM_ST_ERR
;
2502 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2505 ap
->hsm_task_state
= HSM_ST_IDLE
;
2507 ata_poll_qc_complete(qc
, drv_stat
);
2509 /* another command may start at this point */
2517 * @buf: Buffer to swap
2518 * @buf_words: Number of 16-bit words in buffer.
2520 * Swap halves of 16-bit words if needed to convert from
2521 * little-endian byte order to native cpu byte order, or
2526 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
2531 for (i
= 0; i
< buf_words
; i
++)
2532 buf
[i
] = le16_to_cpu(buf
[i
]);
2533 #endif /* __BIG_ENDIAN */
2537 * ata_mmio_data_xfer - Transfer data by MMIO
2538 * @ap: port to read/write
2540 * @buflen: buffer length
2541 * @write_data: read/write
2543 * Transfer data from/to the device data register by MMIO.
2546 * Inherited from caller.
2550 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2551 unsigned int buflen
, int write_data
)
2554 unsigned int words
= buflen
>> 1;
2555 u16
*buf16
= (u16
*) buf
;
2556 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
2558 /* Transfer multiple of 2 bytes */
2560 for (i
= 0; i
< words
; i
++)
2561 writew(le16_to_cpu(buf16
[i
]), mmio
);
2563 for (i
= 0; i
< words
; i
++)
2564 buf16
[i
] = cpu_to_le16(readw(mmio
));
2567 /* Transfer trailing 1 byte, if any. */
2568 if (unlikely(buflen
& 0x01)) {
2569 u16 align_buf
[1] = { 0 };
2570 unsigned char *trailing_buf
= buf
+ buflen
- 1;
2573 memcpy(align_buf
, trailing_buf
, 1);
2574 writew(le16_to_cpu(align_buf
[0]), mmio
);
2576 align_buf
[0] = cpu_to_le16(readw(mmio
));
2577 memcpy(trailing_buf
, align_buf
, 1);
2583 * ata_pio_data_xfer - Transfer data by PIO
2584 * @ap: port to read/write
2586 * @buflen: buffer length
2587 * @write_data: read/write
2589 * Transfer data from/to the device data register by PIO.
2592 * Inherited from caller.
2596 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2597 unsigned int buflen
, int write_data
)
2599 unsigned int words
= buflen
>> 1;
2601 /* Transfer multiple of 2 bytes */
2603 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
2605 insw(ap
->ioaddr
.data_addr
, buf
, words
);
2607 /* Transfer trailing 1 byte, if any. */
2608 if (unlikely(buflen
& 0x01)) {
2609 u16 align_buf
[1] = { 0 };
2610 unsigned char *trailing_buf
= buf
+ buflen
- 1;
2613 memcpy(align_buf
, trailing_buf
, 1);
2614 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
2616 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
2617 memcpy(trailing_buf
, align_buf
, 1);
2623 * ata_data_xfer - Transfer data from/to the data register.
2624 * @ap: port to read/write
2626 * @buflen: buffer length
2627 * @do_write: read/write
2629 * Transfer data from/to the device data register.
2632 * Inherited from caller.
2636 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2637 unsigned int buflen
, int do_write
)
2639 if (ap
->flags
& ATA_FLAG_MMIO
)
2640 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
2642 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
2646 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
2647 * @qc: Command on going
2649 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
2652 * Inherited from caller.
2655 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
2657 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
2658 struct scatterlist
*sg
= qc
->sg
;
2659 struct ata_port
*ap
= qc
->ap
;
2661 unsigned int offset
;
2664 if (qc
->cursect
== (qc
->nsect
- 1))
2665 ap
->hsm_task_state
= HSM_ST_LAST
;
2667 page
= sg
[qc
->cursg
].page
;
2668 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
2670 /* get the current page and offset */
2671 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
2672 offset
%= PAGE_SIZE
;
2674 buf
= kmap(page
) + offset
;
2679 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
2684 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2686 /* do the actual data transfer */
2687 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
2688 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
2694 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
2695 * @qc: Command on going
2696 * @bytes: number of bytes
2698 * Transfer Transfer data from/to the ATAPI device.
2701 * Inherited from caller.
2705 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
2707 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
2708 struct scatterlist
*sg
= qc
->sg
;
2709 struct ata_port
*ap
= qc
->ap
;
2712 unsigned int offset
, count
;
2714 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
2715 ap
->hsm_task_state
= HSM_ST_LAST
;
2718 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
2720 * The end of qc->sg is reached and the device expects
2721 * more data to transfer. In order not to overrun qc->sg
2722 * and fulfill length specified in the byte count register,
2723 * - for read case, discard trailing data from the device
2724 * - for write case, padding zero data to the device
2726 u16 pad_buf
[1] = { 0 };
2727 unsigned int words
= bytes
>> 1;
2730 if (words
) /* warning if bytes > 1 */
2731 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
2734 for (i
= 0; i
< words
; i
++)
2735 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
2737 ap
->hsm_task_state
= HSM_ST_LAST
;
2741 sg
= &qc
->sg
[qc
->cursg
];
2744 offset
= sg
->offset
+ qc
->cursg_ofs
;
2746 /* get the current page and offset */
2747 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
2748 offset
%= PAGE_SIZE
;
2750 /* don't overrun current sg */
2751 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
2753 /* don't cross page boundaries */
2754 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
2756 buf
= kmap(page
) + offset
;
2759 qc
->curbytes
+= count
;
2760 qc
->cursg_ofs
+= count
;
2762 if (qc
->cursg_ofs
== sg
->length
) {
2767 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2769 /* do the actual data transfer */
2770 ata_data_xfer(ap
, buf
, count
, do_write
);
2779 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
2780 * @qc: Command on going
2782 * Transfer Transfer data from/to the ATAPI device.
2785 * Inherited from caller.
2789 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
2791 struct ata_port
*ap
= qc
->ap
;
2792 struct ata_device
*dev
= qc
->dev
;
2793 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
2794 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
2796 ap
->ops
->tf_read(ap
, &qc
->tf
);
2797 ireason
= qc
->tf
.nsect
;
2798 bc_lo
= qc
->tf
.lbam
;
2799 bc_hi
= qc
->tf
.lbah
;
2800 bytes
= (bc_hi
<< 8) | bc_lo
;
2802 /* shall be cleared to zero, indicating xfer of data */
2803 if (ireason
& (1 << 0))
2806 /* make sure transfer direction matches expected */
2807 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
2808 if (do_write
!= i_write
)
2811 __atapi_pio_bytes(qc
, bytes
);
2816 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
2817 ap
->id
, dev
->devno
);
2818 ap
->hsm_task_state
= HSM_ST_ERR
;
2826 * None. (executing in kernel thread context)
2829 static void ata_pio_block(struct ata_port
*ap
)
2831 struct ata_queued_cmd
*qc
;
2835 * This is purely hueristic. This is a fast path.
2836 * Sometimes when we enter, BSY will be cleared in
2837 * a chk-status or two. If not, the drive is probably seeking
2838 * or something. Snooze for a couple msecs, then
2839 * chk-status again. If still busy, fall back to
2840 * HSM_ST_POLL state.
2842 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
2843 if (status
& ATA_BUSY
) {
2845 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2846 if (status
& ATA_BUSY
) {
2847 ap
->hsm_task_state
= HSM_ST_POLL
;
2848 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2853 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2856 if (is_atapi_taskfile(&qc
->tf
)) {
2857 /* no more data to transfer or unsupported ATAPI command */
2858 if ((status
& ATA_DRQ
) == 0) {
2859 ap
->hsm_task_state
= HSM_ST_LAST
;
2863 atapi_pio_bytes(qc
);
2865 /* handle BSY=0, DRQ=0 as error */
2866 if ((status
& ATA_DRQ
) == 0) {
2867 ap
->hsm_task_state
= HSM_ST_ERR
;
2875 static void ata_pio_error(struct ata_port
*ap
)
2877 struct ata_queued_cmd
*qc
;
2880 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2883 drv_stat
= ata_chk_status(ap
);
2884 printk(KERN_WARNING
"ata%u: PIO error, drv_stat 0x%x\n",
2887 ap
->hsm_task_state
= HSM_ST_IDLE
;
2889 ata_poll_qc_complete(qc
, drv_stat
| ATA_ERR
);
2892 static void ata_pio_task(void *_data
)
2894 struct ata_port
*ap
= _data
;
2895 unsigned long timeout
;
2902 switch (ap
->hsm_task_state
) {
2911 qc_completed
= ata_pio_complete(ap
);
2915 case HSM_ST_LAST_POLL
:
2916 timeout
= ata_pio_poll(ap
);
2926 queue_delayed_work(ata_wq
, &ap
->pio_task
, timeout
);
2927 else if (!qc_completed
)
2931 static void atapi_request_sense(struct ata_port
*ap
, struct ata_device
*dev
,
2932 struct scsi_cmnd
*cmd
)
2934 DECLARE_COMPLETION(wait
);
2935 struct ata_queued_cmd
*qc
;
2936 unsigned long flags
;
2939 DPRINTK("ATAPI request sense\n");
2941 qc
= ata_qc_new_init(ap
, dev
);
2944 /* FIXME: is this needed? */
2945 memset(cmd
->sense_buffer
, 0, sizeof(cmd
->sense_buffer
));
2947 ata_sg_init_one(qc
, cmd
->sense_buffer
, sizeof(cmd
->sense_buffer
));
2948 qc
->dma_dir
= DMA_FROM_DEVICE
;
2950 memset(&qc
->cdb
, 0, ap
->cdb_len
);
2951 qc
->cdb
[0] = REQUEST_SENSE
;
2952 qc
->cdb
[4] = SCSI_SENSE_BUFFERSIZE
;
2954 qc
->tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2955 qc
->tf
.command
= ATA_CMD_PACKET
;
2957 qc
->tf
.protocol
= ATA_PROT_ATAPI
;
2958 qc
->tf
.lbam
= (8 * 1024) & 0xff;
2959 qc
->tf
.lbah
= (8 * 1024) >> 8;
2960 qc
->nbytes
= SCSI_SENSE_BUFFERSIZE
;
2962 qc
->waiting
= &wait
;
2963 qc
->complete_fn
= ata_qc_complete_noop
;
2965 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2966 rc
= ata_qc_issue(qc
);
2967 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2970 ata_port_disable(ap
);
2972 wait_for_completion(&wait
);
2978 * ata_qc_timeout - Handle timeout of queued command
2979 * @qc: Command that timed out
2981 * Some part of the kernel (currently, only the SCSI layer)
2982 * has noticed that the active command on port @ap has not
2983 * completed after a specified length of time. Handle this
2984 * condition by disabling DMA (if necessary) and completing
2985 * transactions, with error if necessary.
2987 * This also handles the case of the "lost interrupt", where
2988 * for some reason (possibly hardware bug, possibly driver bug)
2989 * an interrupt was not delivered to the driver, even though the
2990 * transaction completed successfully.
2993 * Inherited from SCSI layer (none, can sleep)
2996 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
2998 struct ata_port
*ap
= qc
->ap
;
2999 struct ata_host_set
*host_set
= ap
->host_set
;
3000 struct ata_device
*dev
= qc
->dev
;
3001 u8 host_stat
= 0, drv_stat
;
3002 unsigned long flags
;
3006 /* FIXME: doesn't this conflict with timeout handling? */
3007 if (qc
->dev
->class == ATA_DEV_ATAPI
&& qc
->scsicmd
) {
3008 struct scsi_cmnd
*cmd
= qc
->scsicmd
;
3010 if (!(cmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
)) {
3012 /* finish completing original command */
3013 spin_lock_irqsave(&host_set
->lock
, flags
);
3014 __ata_qc_complete(qc
);
3015 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3017 atapi_request_sense(ap
, dev
, cmd
);
3019 cmd
->result
= (CHECK_CONDITION
<< 1) | (DID_OK
<< 16);
3020 scsi_finish_command(cmd
);
3026 spin_lock_irqsave(&host_set
->lock
, flags
);
3028 /* hack alert! We cannot use the supplied completion
3029 * function from inside the ->eh_strategy_handler() thread.
3030 * libata is the only user of ->eh_strategy_handler() in
3031 * any kernel, so the default scsi_done() assumes it is
3032 * not being called from the SCSI EH.
3034 qc
->scsidone
= scsi_finish_command
;
3036 switch (qc
->tf
.protocol
) {
3039 case ATA_PROT_ATAPI_DMA
:
3040 host_stat
= ap
->ops
->bmdma_status(ap
);
3042 /* before we do anything else, clear DMA-Start bit */
3043 ap
->ops
->bmdma_stop(qc
);
3049 drv_stat
= ata_chk_status(ap
);
3051 /* ack bmdma irq events */
3052 ap
->ops
->irq_clear(ap
);
3054 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3055 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3057 /* complete taskfile transaction */
3058 ata_qc_complete(qc
, drv_stat
);
3062 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3069 * ata_eng_timeout - Handle timeout of queued command
3070 * @ap: Port on which timed-out command is active
3072 * Some part of the kernel (currently, only the SCSI layer)
3073 * has noticed that the active command on port @ap has not
3074 * completed after a specified length of time. Handle this
3075 * condition by disabling DMA (if necessary) and completing
3076 * transactions, with error if necessary.
3078 * This also handles the case of the "lost interrupt", where
3079 * for some reason (possibly hardware bug, possibly driver bug)
3080 * an interrupt was not delivered to the driver, even though the
3081 * transaction completed successfully.
3084 * Inherited from SCSI layer (none, can sleep)
3087 void ata_eng_timeout(struct ata_port
*ap
)
3089 struct ata_queued_cmd
*qc
;
3093 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3095 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
3107 * ata_qc_new - Request an available ATA command, for queueing
3108 * @ap: Port associated with device @dev
3109 * @dev: Device from whom we request an available command structure
3115 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3117 struct ata_queued_cmd
*qc
= NULL
;
3120 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3121 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3122 qc
= ata_qc_from_tag(ap
, i
);
3133 * ata_qc_new_init - Request an available ATA command, and initialize it
3134 * @ap: Port associated with device @dev
3135 * @dev: Device from whom we request an available command structure
3141 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3142 struct ata_device
*dev
)
3144 struct ata_queued_cmd
*qc
;
3146 qc
= ata_qc_new(ap
);
3153 qc
->cursect
= qc
->cursg
= qc
->cursg_ofs
= 0;
3155 qc
->nbytes
= qc
->curbytes
= 0;
3157 ata_tf_init(ap
, &qc
->tf
, dev
->devno
);
3159 if (dev
->flags
& ATA_DFLAG_LBA48
)
3160 qc
->tf
.flags
|= ATA_TFLAG_LBA48
;
3166 static int ata_qc_complete_noop(struct ata_queued_cmd
*qc
, u8 drv_stat
)
3171 static void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3173 struct ata_port
*ap
= qc
->ap
;
3174 unsigned int tag
, do_clear
= 0;
3178 if (likely(ata_tag_valid(tag
))) {
3179 if (tag
== ap
->active_tag
)
3180 ap
->active_tag
= ATA_TAG_POISON
;
3181 qc
->tag
= ATA_TAG_POISON
;
3186 struct completion
*waiting
= qc
->waiting
;
3191 if (likely(do_clear
))
3192 clear_bit(tag
, &ap
->qactive
);
3196 * ata_qc_free - free unused ata_queued_cmd
3197 * @qc: Command to complete
3199 * Designed to free unused ata_queued_cmd object
3200 * in case something prevents using it.
3203 * spin_lock_irqsave(host_set lock)
3206 void ata_qc_free(struct ata_queued_cmd
*qc
)
3208 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3209 assert(qc
->waiting
== NULL
); /* nothing should be waiting */
3211 __ata_qc_complete(qc
);
3215 * ata_qc_complete - Complete an active ATA command
3216 * @qc: Command to complete
3217 * @drv_stat: ATA Status register contents
3219 * Indicate to the mid and upper layers that an ATA
3220 * command has completed, with either an ok or not-ok status.
3223 * spin_lock_irqsave(host_set lock)
3227 void ata_qc_complete(struct ata_queued_cmd
*qc
, u8 drv_stat
)
3231 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3232 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3234 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3237 /* atapi: mark qc as inactive to prevent the interrupt handler
3238 * from completing the command twice later, before the error handler
3239 * is called. (when rc != 0 and atapi request sense is needed)
3241 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3243 /* call completion callback */
3244 rc
= qc
->complete_fn(qc
, drv_stat
);
3246 /* if callback indicates not to complete command (non-zero),
3247 * return immediately
3252 __ata_qc_complete(qc
);
3257 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3259 struct ata_port
*ap
= qc
->ap
;
3261 switch (qc
->tf
.protocol
) {
3263 case ATA_PROT_ATAPI_DMA
:
3266 case ATA_PROT_ATAPI
:
3268 case ATA_PROT_PIO_MULT
:
3269 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3282 * ata_qc_issue - issue taskfile to device
3283 * @qc: command to issue to device
3285 * Prepare an ATA command to submission to device.
3286 * This includes mapping the data into a DMA-able
3287 * area, filling in the S/G table, and finally
3288 * writing the taskfile to hardware, starting the command.
3291 * spin_lock_irqsave(host_set lock)
3294 * Zero on success, negative on error.
3297 int ata_qc_issue(struct ata_queued_cmd
*qc
)
3299 struct ata_port
*ap
= qc
->ap
;
3301 if (ata_should_dma_map(qc
)) {
3302 if (qc
->flags
& ATA_QCFLAG_SG
) {
3303 if (ata_sg_setup(qc
))
3305 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3306 if (ata_sg_setup_one(qc
))
3310 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3313 ap
->ops
->qc_prep(qc
);
3315 qc
->ap
->active_tag
= qc
->tag
;
3316 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3318 return ap
->ops
->qc_issue(qc
);
3326 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3327 * @qc: command to issue to device
3329 * Using various libata functions and hooks, this function
3330 * starts an ATA command. ATA commands are grouped into
3331 * classes called "protocols", and issuing each type of protocol
3332 * is slightly different.
3334 * May be used as the qc_issue() entry in ata_port_operations.
3337 * spin_lock_irqsave(host_set lock)
3340 * Zero on success, negative on error.
3343 int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3345 struct ata_port
*ap
= qc
->ap
;
3347 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3349 switch (qc
->tf
.protocol
) {
3350 case ATA_PROT_NODATA
:
3351 ata_tf_to_host_nolock(ap
, &qc
->tf
);
3355 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3356 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3357 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3360 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3361 ata_qc_set_polling(qc
);
3362 ata_tf_to_host_nolock(ap
, &qc
->tf
);
3363 ap
->hsm_task_state
= HSM_ST
;
3364 queue_work(ata_wq
, &ap
->pio_task
);
3367 case ATA_PROT_ATAPI
:
3368 ata_qc_set_polling(qc
);
3369 ata_tf_to_host_nolock(ap
, &qc
->tf
);
3370 queue_work(ata_wq
, &ap
->packet_task
);
3373 case ATA_PROT_ATAPI_NODATA
:
3374 ap
->flags
|= ATA_FLAG_NOINTR
;
3375 ata_tf_to_host_nolock(ap
, &qc
->tf
);
3376 queue_work(ata_wq
, &ap
->packet_task
);
3379 case ATA_PROT_ATAPI_DMA
:
3380 ap
->flags
|= ATA_FLAG_NOINTR
;
3381 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3382 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3383 queue_work(ata_wq
, &ap
->packet_task
);
3395 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3396 * @qc: Info associated with this ATA transaction.
3399 * spin_lock_irqsave(host_set lock)
3402 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3404 struct ata_port
*ap
= qc
->ap
;
3405 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3407 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3409 /* load PRD table addr. */
3410 mb(); /* make sure PRD table writes are visible to controller */
3411 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3413 /* specify data direction, triple-check start bit is clear */
3414 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3415 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3417 dmactl
|= ATA_DMA_WR
;
3418 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3420 /* issue r/w command */
3421 ap
->ops
->exec_command(ap
, &qc
->tf
);
3425 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3426 * @qc: Info associated with this ATA transaction.
3429 * spin_lock_irqsave(host_set lock)
3432 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3434 struct ata_port
*ap
= qc
->ap
;
3435 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3438 /* start host DMA transaction */
3439 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3440 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3442 /* Strictly, one may wish to issue a readb() here, to
3443 * flush the mmio write. However, control also passes
3444 * to the hardware at this point, and it will interrupt
3445 * us when we are to resume control. So, in effect,
3446 * we don't care when the mmio write flushes.
3447 * Further, a read of the DMA status register _immediately_
3448 * following the write may not be what certain flaky hardware
3449 * is expected, so I think it is best to not add a readb()
3450 * without first all the MMIO ATA cards/mobos.
3451 * Or maybe I'm just being paranoid.
3456 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3457 * @qc: Info associated with this ATA transaction.
3460 * spin_lock_irqsave(host_set lock)
3463 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3465 struct ata_port
*ap
= qc
->ap
;
3466 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3469 /* load PRD table addr. */
3470 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3472 /* specify data direction, triple-check start bit is clear */
3473 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3474 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3476 dmactl
|= ATA_DMA_WR
;
3477 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3479 /* issue r/w command */
3480 ap
->ops
->exec_command(ap
, &qc
->tf
);
3484 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3485 * @qc: Info associated with this ATA transaction.
3488 * spin_lock_irqsave(host_set lock)
3491 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3493 struct ata_port
*ap
= qc
->ap
;
3496 /* start host DMA transaction */
3497 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3498 outb(dmactl
| ATA_DMA_START
,
3499 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3504 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3505 * @qc: Info associated with this ATA transaction.
3507 * Writes the ATA_DMA_START flag to the DMA command register.
3509 * May be used as the bmdma_start() entry in ata_port_operations.
3512 * spin_lock_irqsave(host_set lock)
3514 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3516 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3517 ata_bmdma_start_mmio(qc
);
3519 ata_bmdma_start_pio(qc
);
3524 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3525 * @qc: Info associated with this ATA transaction.
3527 * Writes address of PRD table to device's PRD Table Address
3528 * register, sets the DMA control register, and calls
3529 * ops->exec_command() to start the transfer.
3531 * May be used as the bmdma_setup() entry in ata_port_operations.
3534 * spin_lock_irqsave(host_set lock)
3536 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3538 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3539 ata_bmdma_setup_mmio(qc
);
3541 ata_bmdma_setup_pio(qc
);
3546 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3547 * @ap: Port associated with this ATA transaction.
3549 * Clear interrupt and error flags in DMA status register.
3551 * May be used as the irq_clear() entry in ata_port_operations.
3554 * spin_lock_irqsave(host_set lock)
3557 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3559 if (ap
->flags
& ATA_FLAG_MMIO
) {
3560 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3561 writeb(readb(mmio
), mmio
);
3563 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3564 outb(inb(addr
), addr
);
3571 * ata_bmdma_status - Read PCI IDE BMDMA status
3572 * @ap: Port associated with this ATA transaction.
3574 * Read and return BMDMA status register.
3576 * May be used as the bmdma_status() entry in ata_port_operations.
3579 * spin_lock_irqsave(host_set lock)
3582 u8
ata_bmdma_status(struct ata_port
*ap
)
3585 if (ap
->flags
& ATA_FLAG_MMIO
) {
3586 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3587 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3589 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
3595 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3596 * @qc: Command we are ending DMA for
3598 * Clears the ATA_DMA_START flag in the dma control register
3600 * May be used as the bmdma_stop() entry in ata_port_operations.
3603 * spin_lock_irqsave(host_set lock)
3606 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
3608 struct ata_port
*ap
= qc
->ap
;
3609 if (ap
->flags
& ATA_FLAG_MMIO
) {
3610 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3612 /* clear start/stop bit */
3613 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3614 mmio
+ ATA_DMA_CMD
);
3616 /* clear start/stop bit */
3617 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3618 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3621 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
3622 ata_altstatus(ap
); /* dummy read */
3626 * ata_host_intr - Handle host interrupt for given (port, task)
3627 * @ap: Port on which interrupt arrived (possibly...)
3628 * @qc: Taskfile currently active in engine
3630 * Handle host interrupt for given queued command. Currently,
3631 * only DMA interrupts are handled. All other commands are
3632 * handled via polling with interrupts disabled (nIEN bit).
3635 * spin_lock_irqsave(host_set lock)
3638 * One if interrupt was handled, zero if not (shared irq).
3641 inline unsigned int ata_host_intr (struct ata_port
*ap
,
3642 struct ata_queued_cmd
*qc
)
3644 u8 status
, host_stat
;
3646 switch (qc
->tf
.protocol
) {
3649 case ATA_PROT_ATAPI_DMA
:
3650 case ATA_PROT_ATAPI
:
3651 /* check status of DMA engine */
3652 host_stat
= ap
->ops
->bmdma_status(ap
);
3653 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
3655 /* if it's not our irq... */
3656 if (!(host_stat
& ATA_DMA_INTR
))
3659 /* before we do anything else, clear DMA-Start bit */
3660 ap
->ops
->bmdma_stop(qc
);
3664 case ATA_PROT_ATAPI_NODATA
:
3665 case ATA_PROT_NODATA
:
3666 /* check altstatus */
3667 status
= ata_altstatus(ap
);
3668 if (status
& ATA_BUSY
)
3671 /* check main status, clearing INTRQ */
3672 status
= ata_chk_status(ap
);
3673 if (unlikely(status
& ATA_BUSY
))
3675 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
3676 ap
->id
, qc
->tf
.protocol
, status
);
3678 /* ack bmdma irq events */
3679 ap
->ops
->irq_clear(ap
);
3681 /* complete taskfile transaction */
3682 ata_qc_complete(qc
, status
);
3689 return 1; /* irq handled */
3692 ap
->stats
.idle_irq
++;
3695 if ((ap
->stats
.idle_irq
% 1000) == 0) {
3697 ata_irq_ack(ap
, 0); /* debug trap */
3698 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
3701 return 0; /* irq not handled */
3705 * ata_interrupt - Default ATA host interrupt handler
3706 * @irq: irq line (unused)
3707 * @dev_instance: pointer to our ata_host_set information structure
3710 * Default interrupt handler for PCI IDE devices. Calls
3711 * ata_host_intr() for each port that is not disabled.
3714 * Obtains host_set lock during operation.
3717 * IRQ_NONE or IRQ_HANDLED.
3721 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
3723 struct ata_host_set
*host_set
= dev_instance
;
3725 unsigned int handled
= 0;
3726 unsigned long flags
;
3728 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
3729 spin_lock_irqsave(&host_set
->lock
, flags
);
3731 for (i
= 0; i
< host_set
->n_ports
; i
++) {
3732 struct ata_port
*ap
;
3734 ap
= host_set
->ports
[i
];
3736 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
3737 struct ata_queued_cmd
*qc
;
3739 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3740 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
3741 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
3742 handled
|= ata_host_intr(ap
, qc
);
3746 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3748 return IRQ_RETVAL(handled
);
3752 * atapi_packet_task - Write CDB bytes to hardware
3753 * @_data: Port to which ATAPI device is attached.
3755 * When device has indicated its readiness to accept
3756 * a CDB, this function is called. Send the CDB.
3757 * If DMA is to be performed, exit immediately.
3758 * Otherwise, we are in polling mode, so poll
3759 * status under operation succeeds or fails.
3762 * Kernel thread context (may sleep)
3765 static void atapi_packet_task(void *_data
)
3767 struct ata_port
*ap
= _data
;
3768 struct ata_queued_cmd
*qc
;
3771 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3773 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3775 /* sleep-wait for BSY to clear */
3776 DPRINTK("busy wait\n");
3777 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
))
3780 /* make sure DRQ is set */
3781 status
= ata_chk_status(ap
);
3782 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)
3786 DPRINTK("send cdb\n");
3787 assert(ap
->cdb_len
>= 12);
3789 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3790 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3791 unsigned long flags
;
3793 /* Once we're done issuing command and kicking bmdma,
3794 * irq handler takes over. To not lose irq, we need
3795 * to clear NOINTR flag before sending cdb, but
3796 * interrupt handler shouldn't be invoked before we're
3797 * finished. Hence, the following locking.
3799 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3800 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3801 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
3802 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3803 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3804 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3806 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
3808 /* PIO commands are handled by polling */
3809 ap
->hsm_task_state
= HSM_ST
;
3810 queue_work(ata_wq
, &ap
->pio_task
);
3816 ata_poll_qc_complete(qc
, ATA_ERR
);
3821 * ata_port_start - Set port up for dma.
3822 * @ap: Port to initialize
3824 * Called just after data structures for each port are
3825 * initialized. Allocates space for PRD table.
3827 * May be used as the port_start() entry in ata_port_operations.
3832 int ata_port_start (struct ata_port
*ap
)
3834 struct device
*dev
= ap
->host_set
->dev
;
3836 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
3840 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
3847 * ata_port_stop - Undo ata_port_start()
3848 * @ap: Port to shut down
3850 * Frees the PRD table.
3852 * May be used as the port_stop() entry in ata_port_operations.
3857 void ata_port_stop (struct ata_port
*ap
)
3859 struct device
*dev
= ap
->host_set
->dev
;
3861 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
3864 void ata_host_stop (struct ata_host_set
*host_set
)
3866 if (host_set
->mmio_base
)
3867 iounmap(host_set
->mmio_base
);
3872 * ata_host_remove - Unregister SCSI host structure with upper layers
3873 * @ap: Port to unregister
3874 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
3879 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
3881 struct Scsi_Host
*sh
= ap
->host
;
3886 scsi_remove_host(sh
);
3888 ap
->ops
->port_stop(ap
);
3892 * ata_host_init - Initialize an ata_port structure
3893 * @ap: Structure to initialize
3894 * @host: associated SCSI mid-layer structure
3895 * @host_set: Collection of hosts to which @ap belongs
3896 * @ent: Probe information provided by low-level driver
3897 * @port_no: Port number associated with this ata_port
3899 * Initialize a new ata_port structure, and its associated
3903 * Inherited from caller.
3907 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
3908 struct ata_host_set
*host_set
,
3909 struct ata_probe_ent
*ent
, unsigned int port_no
)
3915 host
->max_channel
= 1;
3916 host
->unique_id
= ata_unique_id
++;
3917 host
->max_cmd_len
= 12;
3919 scsi_assign_lock(host
, &host_set
->lock
);
3921 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
3922 ap
->id
= host
->unique_id
;
3924 ap
->ctl
= ATA_DEVCTL_OBS
;
3925 ap
->host_set
= host_set
;
3926 ap
->port_no
= port_no
;
3928 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
3929 ap
->pio_mask
= ent
->pio_mask
;
3930 ap
->mwdma_mask
= ent
->mwdma_mask
;
3931 ap
->udma_mask
= ent
->udma_mask
;
3932 ap
->flags
|= ent
->host_flags
;
3933 ap
->ops
= ent
->port_ops
;
3934 ap
->cbl
= ATA_CBL_NONE
;
3935 ap
->active_tag
= ATA_TAG_POISON
;
3936 ap
->last_ctl
= 0xFF;
3938 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
3939 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
3941 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
3942 ap
->device
[i
].devno
= i
;
3945 ap
->stats
.unhandled_irq
= 1;
3946 ap
->stats
.idle_irq
= 1;
3949 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
3953 * ata_host_add - Attach low-level ATA driver to system
3954 * @ent: Information provided by low-level driver
3955 * @host_set: Collections of ports to which we add
3956 * @port_no: Port number associated with this host
3958 * Attach low-level ATA driver to system.
3961 * PCI/etc. bus probe sem.
3964 * New ata_port on success, for NULL on error.
3968 static struct ata_port
* ata_host_add(struct ata_probe_ent
*ent
,
3969 struct ata_host_set
*host_set
,
3970 unsigned int port_no
)
3972 struct Scsi_Host
*host
;
3973 struct ata_port
*ap
;
3977 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
3981 ap
= (struct ata_port
*) &host
->hostdata
[0];
3983 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
3985 rc
= ap
->ops
->port_start(ap
);
3992 scsi_host_put(host
);
3997 * ata_device_add - Register hardware device with ATA and SCSI layers
3998 * @ent: Probe information describing hardware device to be registered
4000 * This function processes the information provided in the probe
4001 * information struct @ent, allocates the necessary ATA and SCSI
4002 * host information structures, initializes them, and registers
4003 * everything with requisite kernel subsystems.
4005 * This function requests irqs, probes the ATA bus, and probes
4009 * PCI/etc. bus probe sem.
4012 * Number of ports registered. Zero on error (no ports registered).
4016 int ata_device_add(struct ata_probe_ent
*ent
)
4018 unsigned int count
= 0, i
;
4019 struct device
*dev
= ent
->dev
;
4020 struct ata_host_set
*host_set
;
4023 /* alloc a container for our list of ATA ports (buses) */
4024 host_set
= kmalloc(sizeof(struct ata_host_set
) +
4025 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4028 memset(host_set
, 0, sizeof(struct ata_host_set
) + (ent
->n_ports
* sizeof(void *)));
4029 spin_lock_init(&host_set
->lock
);
4031 host_set
->dev
= dev
;
4032 host_set
->n_ports
= ent
->n_ports
;
4033 host_set
->irq
= ent
->irq
;
4034 host_set
->mmio_base
= ent
->mmio_base
;
4035 host_set
->private_data
= ent
->private_data
;
4036 host_set
->ops
= ent
->port_ops
;
4038 /* register each port bound to this device */
4039 for (i
= 0; i
< ent
->n_ports
; i
++) {
4040 struct ata_port
*ap
;
4041 unsigned long xfer_mode_mask
;
4043 ap
= ata_host_add(ent
, host_set
, i
);
4047 host_set
->ports
[i
] = ap
;
4048 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4049 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4050 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4052 /* print per-port info to dmesg */
4053 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4054 "bmdma 0x%lX irq %lu\n",
4056 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4057 ata_mode_string(xfer_mode_mask
),
4058 ap
->ioaddr
.cmd_addr
,
4059 ap
->ioaddr
.ctl_addr
,
4060 ap
->ioaddr
.bmdma_addr
,
4064 host_set
->ops
->irq_clear(ap
);
4073 /* obtain irq, that is shared between channels */
4074 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4075 DRV_NAME
, host_set
))
4078 /* perform each probe synchronously */
4079 DPRINTK("probe begin\n");
4080 for (i
= 0; i
< count
; i
++) {
4081 struct ata_port
*ap
;
4084 ap
= host_set
->ports
[i
];
4086 DPRINTK("ata%u: probe begin\n", ap
->id
);
4087 rc
= ata_bus_probe(ap
);
4088 DPRINTK("ata%u: probe end\n", ap
->id
);
4091 /* FIXME: do something useful here?
4092 * Current libata behavior will
4093 * tear down everything when
4094 * the module is removed
4095 * or the h/w is unplugged.
4099 rc
= scsi_add_host(ap
->host
, dev
);
4101 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4103 /* FIXME: do something useful here */
4104 /* FIXME: handle unconditional calls to
4105 * scsi_scan_host and ata_host_remove, below,
4111 /* probes are done, now scan each port's disk(s) */
4112 DPRINTK("probe begin\n");
4113 for (i
= 0; i
< count
; i
++) {
4114 struct ata_port
*ap
= host_set
->ports
[i
];
4116 scsi_scan_host(ap
->host
);
4119 dev_set_drvdata(dev
, host_set
);
4121 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4122 return ent
->n_ports
; /* success */
4125 for (i
= 0; i
< count
; i
++) {
4126 ata_host_remove(host_set
->ports
[i
], 1);
4127 scsi_host_put(host_set
->ports
[i
]->host
);
4130 VPRINTK("EXIT, returning 0\n");
4135 * ata_host_set_remove - PCI layer callback for device removal
4136 * @host_set: ATA host set that was removed
4138 * Unregister all objects associated with this host set. Free those
4142 * Inherited from calling layer (may sleep).
4146 void ata_host_set_remove(struct ata_host_set
*host_set
)
4148 struct ata_port
*ap
;
4151 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4152 ap
= host_set
->ports
[i
];
4153 scsi_remove_host(ap
->host
);
4156 free_irq(host_set
->irq
, host_set
);
4158 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4159 ap
= host_set
->ports
[i
];
4161 ata_scsi_release(ap
->host
);
4163 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4164 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4166 if (ioaddr
->cmd_addr
== 0x1f0)
4167 release_region(0x1f0, 8);
4168 else if (ioaddr
->cmd_addr
== 0x170)
4169 release_region(0x170, 8);
4172 scsi_host_put(ap
->host
);
4175 if (host_set
->ops
->host_stop
)
4176 host_set
->ops
->host_stop(host_set
);
4182 * ata_scsi_release - SCSI layer callback hook for host unload
4183 * @host: libata host to be unloaded
4185 * Performs all duties necessary to shut down a libata port...
4186 * Kill port kthread, disable port, and release resources.
4189 * Inherited from SCSI layer.
4195 int ata_scsi_release(struct Scsi_Host
*host
)
4197 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4201 ap
->ops
->port_disable(ap
);
4202 ata_host_remove(ap
, 0);
4209 * ata_std_ports - initialize ioaddr with standard port offsets.
4210 * @ioaddr: IO address structure to be initialized
4212 * Utility function which initializes data_addr, error_addr,
4213 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4214 * device_addr, status_addr, and command_addr to standard offsets
4215 * relative to cmd_addr.
4217 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4220 void ata_std_ports(struct ata_ioports
*ioaddr
)
4222 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4223 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4224 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4225 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4226 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4227 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4228 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4229 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4230 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4231 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4234 static struct ata_probe_ent
*
4235 ata_probe_ent_alloc(struct device
*dev
, struct ata_port_info
*port
)
4237 struct ata_probe_ent
*probe_ent
;
4239 probe_ent
= kmalloc(sizeof(*probe_ent
), GFP_KERNEL
);
4241 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
4242 kobject_name(&(dev
->kobj
)));
4246 memset(probe_ent
, 0, sizeof(*probe_ent
));
4248 INIT_LIST_HEAD(&probe_ent
->node
);
4249 probe_ent
->dev
= dev
;
4251 probe_ent
->sht
= port
->sht
;
4252 probe_ent
->host_flags
= port
->host_flags
;
4253 probe_ent
->pio_mask
= port
->pio_mask
;
4254 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
4255 probe_ent
->udma_mask
= port
->udma_mask
;
4256 probe_ent
->port_ops
= port
->port_ops
;
4265 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4267 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4269 pci_iounmap(pdev
, host_set
->mmio_base
);
4273 * ata_pci_init_native_mode - Initialize native-mode driver
4274 * @pdev: pci device to be initialized
4275 * @port: array[2] of pointers to port info structures.
4277 * Utility function which allocates and initializes an
4278 * ata_probe_ent structure for a standard dual-port
4279 * PIO-based IDE controller. The returned ata_probe_ent
4280 * structure can be passed to ata_device_add(). The returned
4281 * ata_probe_ent structure should then be freed with kfree().
4284 struct ata_probe_ent
*
4285 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
)
4287 struct ata_probe_ent
*probe_ent
=
4288 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4292 probe_ent
->n_ports
= 2;
4293 probe_ent
->irq
= pdev
->irq
;
4294 probe_ent
->irq_flags
= SA_SHIRQ
;
4296 probe_ent
->port
[0].cmd_addr
= pci_resource_start(pdev
, 0);
4297 probe_ent
->port
[0].altstatus_addr
=
4298 probe_ent
->port
[0].ctl_addr
=
4299 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
4300 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4);
4302 probe_ent
->port
[1].cmd_addr
= pci_resource_start(pdev
, 2);
4303 probe_ent
->port
[1].altstatus_addr
=
4304 probe_ent
->port
[1].ctl_addr
=
4305 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
4306 probe_ent
->port
[1].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
4308 ata_std_ports(&probe_ent
->port
[0]);
4309 ata_std_ports(&probe_ent
->port
[1]);
4314 static struct ata_probe_ent
*
4315 ata_pci_init_legacy_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
,
4316 struct ata_probe_ent
**ppe2
)
4318 struct ata_probe_ent
*probe_ent
, *probe_ent2
;
4320 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4323 probe_ent2
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[1]);
4329 probe_ent
->n_ports
= 1;
4330 probe_ent
->irq
= 14;
4332 probe_ent
->hard_port_no
= 0;
4333 probe_ent
->legacy_mode
= 1;
4335 probe_ent2
->n_ports
= 1;
4336 probe_ent2
->irq
= 15;
4338 probe_ent2
->hard_port_no
= 1;
4339 probe_ent2
->legacy_mode
= 1;
4341 probe_ent
->port
[0].cmd_addr
= 0x1f0;
4342 probe_ent
->port
[0].altstatus_addr
=
4343 probe_ent
->port
[0].ctl_addr
= 0x3f6;
4344 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4);
4346 probe_ent2
->port
[0].cmd_addr
= 0x170;
4347 probe_ent2
->port
[0].altstatus_addr
=
4348 probe_ent2
->port
[0].ctl_addr
= 0x376;
4349 probe_ent2
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4)+8;
4351 ata_std_ports(&probe_ent
->port
[0]);
4352 ata_std_ports(&probe_ent2
->port
[0]);
4359 * ata_pci_init_one - Initialize/register PCI IDE host controller
4360 * @pdev: Controller to be initialized
4361 * @port_info: Information from low-level host driver
4362 * @n_ports: Number of ports attached to host controller
4364 * This is a helper function which can be called from a driver's
4365 * xxx_init_one() probe function if the hardware uses traditional
4366 * IDE taskfile registers.
4368 * This function calls pci_enable_device(), reserves its register
4369 * regions, sets the dma mask, enables bus master mode, and calls
4373 * Inherited from PCI layer (may sleep).
4376 * Zero on success, negative on errno-based value on error.
4380 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
4381 unsigned int n_ports
)
4383 struct ata_probe_ent
*probe_ent
, *probe_ent2
= NULL
;
4384 struct ata_port_info
*port
[2];
4386 unsigned int legacy_mode
= 0;
4387 int disable_dev_on_err
= 1;
4392 port
[0] = port_info
[0];
4394 port
[1] = port_info
[1];
4398 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
4399 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
4400 /* TODO: support transitioning to native mode? */
4401 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
4402 mask
= (1 << 2) | (1 << 0);
4403 if ((tmp8
& mask
) != mask
)
4404 legacy_mode
= (1 << 3);
4408 if ((!legacy_mode
) && (n_ports
> 1)) {
4409 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 1\n");
4413 rc
= pci_enable_device(pdev
);
4417 rc
= pci_request_regions(pdev
, DRV_NAME
);
4419 disable_dev_on_err
= 0;
4424 if (!request_region(0x1f0, 8, "libata")) {
4425 struct resource
*conflict
, res
;
4427 res
.end
= 0x1f0 + 8 - 1;
4428 conflict
= ____request_resource(&ioport_resource
, &res
);
4429 if (!strcmp(conflict
->name
, "libata"))
4430 legacy_mode
|= (1 << 0);
4432 disable_dev_on_err
= 0;
4433 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
4436 legacy_mode
|= (1 << 0);
4438 if (!request_region(0x170, 8, "libata")) {
4439 struct resource
*conflict
, res
;
4441 res
.end
= 0x170 + 8 - 1;
4442 conflict
= ____request_resource(&ioport_resource
, &res
);
4443 if (!strcmp(conflict
->name
, "libata"))
4444 legacy_mode
|= (1 << 1);
4446 disable_dev_on_err
= 0;
4447 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
4450 legacy_mode
|= (1 << 1);
4453 /* we have legacy mode, but all ports are unavailable */
4454 if (legacy_mode
== (1 << 3)) {
4456 goto err_out_regions
;
4459 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
4461 goto err_out_regions
;
4462 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
4464 goto err_out_regions
;
4467 probe_ent
= ata_pci_init_legacy_mode(pdev
, port
, &probe_ent2
);
4469 probe_ent
= ata_pci_init_native_mode(pdev
, port
);
4472 goto err_out_regions
;
4475 pci_set_master(pdev
);
4477 /* FIXME: check ata_device_add return */
4479 if (legacy_mode
& (1 << 0))
4480 ata_device_add(probe_ent
);
4481 if (legacy_mode
& (1 << 1))
4482 ata_device_add(probe_ent2
);
4484 ata_device_add(probe_ent
);
4492 if (legacy_mode
& (1 << 0))
4493 release_region(0x1f0, 8);
4494 if (legacy_mode
& (1 << 1))
4495 release_region(0x170, 8);
4496 pci_release_regions(pdev
);
4498 if (disable_dev_on_err
)
4499 pci_disable_device(pdev
);
4504 * ata_pci_remove_one - PCI layer callback for device removal
4505 * @pdev: PCI device that was removed
4507 * PCI layer indicates to libata via this hook that
4508 * hot-unplug or module unload event has occured.
4509 * Handle this by unregistering all objects associated
4510 * with this PCI device. Free those objects. Then finally
4511 * release PCI resources and disable device.
4514 * Inherited from PCI layer (may sleep).
4517 void ata_pci_remove_one (struct pci_dev
*pdev
)
4519 struct device
*dev
= pci_dev_to_dev(pdev
);
4520 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4522 ata_host_set_remove(host_set
);
4523 pci_release_regions(pdev
);
4524 pci_disable_device(pdev
);
4525 dev_set_drvdata(dev
, NULL
);
4528 /* move to PCI subsystem */
4529 int pci_test_config_bits(struct pci_dev
*pdev
, struct pci_bits
*bits
)
4531 unsigned long tmp
= 0;
4533 switch (bits
->width
) {
4536 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4542 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4548 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4559 return (tmp
== bits
->val
) ? 1 : 0;
4561 #endif /* CONFIG_PCI */
4564 static int __init
ata_init(void)
4566 ata_wq
= create_workqueue("ata");
4570 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4574 static void __exit
ata_exit(void)
4576 destroy_workqueue(ata_wq
);
4579 module_init(ata_init
);
4580 module_exit(ata_exit
);
4583 * libata is essentially a library of internal helper functions for
4584 * low-level ATA host controller drivers. As such, the API/ABI is
4585 * likely to change as new drivers are added and updated.
4586 * Do not depend on ABI/API stability.
4589 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4590 EXPORT_SYMBOL_GPL(ata_std_ports
);
4591 EXPORT_SYMBOL_GPL(ata_device_add
);
4592 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4593 EXPORT_SYMBOL_GPL(ata_sg_init
);
4594 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4595 EXPORT_SYMBOL_GPL(ata_qc_complete
);
4596 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4597 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4598 EXPORT_SYMBOL_GPL(ata_tf_load
);
4599 EXPORT_SYMBOL_GPL(ata_tf_read
);
4600 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4601 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4602 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4603 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4604 EXPORT_SYMBOL_GPL(ata_check_status
);
4605 EXPORT_SYMBOL_GPL(ata_altstatus
);
4606 EXPORT_SYMBOL_GPL(ata_chk_err
);
4607 EXPORT_SYMBOL_GPL(ata_exec_command
);
4608 EXPORT_SYMBOL_GPL(ata_port_start
);
4609 EXPORT_SYMBOL_GPL(ata_port_stop
);
4610 EXPORT_SYMBOL_GPL(ata_host_stop
);
4611 EXPORT_SYMBOL_GPL(ata_interrupt
);
4612 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4613 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4614 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4615 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4616 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4617 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4618 EXPORT_SYMBOL_GPL(ata_port_probe
);
4619 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4620 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4621 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4622 EXPORT_SYMBOL_GPL(ata_port_disable
);
4623 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4624 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4625 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4626 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4627 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4628 EXPORT_SYMBOL_GPL(ata_host_intr
);
4629 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4630 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
4631 EXPORT_SYMBOL_GPL(ata_dev_config
);
4632 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4635 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4636 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4637 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4638 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4639 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4640 #endif /* CONFIG_PCI */
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