5 #include <linux/kernel.h>
6 #include <linux/delay.h>
11 #define debug_log(fmt, args...) \
12 printk(KERN_INFO "ide: " fmt, ## args)
14 #define debug_log(fmt, args...) do {} while (0)
18 * Check whether we can support a device,
19 * based on the ATAPI IDENTIFY command results.
21 int ide_check_atapi_device(ide_drive_t
*drive
, const char *s
)
24 u8 gcw
[2], protocol
, device_type
, removable
, drq_type
, packet_size
;
26 *((u16
*)&gcw
) = id
[ATA_ID_CONFIG
];
28 protocol
= (gcw
[1] & 0xC0) >> 6;
29 device_type
= gcw
[1] & 0x1F;
30 removable
= (gcw
[0] & 0x80) >> 7;
31 drq_type
= (gcw
[0] & 0x60) >> 5;
32 packet_size
= gcw
[0] & 0x03;
35 /* kludge for Apple PowerBook internal zip */
36 if (drive
->media
== ide_floppy
&& device_type
== 5 &&
37 !strstr((char *)&id
[ATA_ID_PROD
], "CD-ROM") &&
38 strstr((char *)&id
[ATA_ID_PROD
], "ZIP"))
43 printk(KERN_ERR
"%s: %s: protocol (0x%02x) is not ATAPI\n",
44 s
, drive
->name
, protocol
);
45 else if ((drive
->media
== ide_floppy
&& device_type
!= 0) ||
46 (drive
->media
== ide_tape
&& device_type
!= 1))
47 printk(KERN_ERR
"%s: %s: invalid device type (0x%02x)\n",
48 s
, drive
->name
, device_type
);
49 else if (removable
== 0)
50 printk(KERN_ERR
"%s: %s: the removable flag is not set\n",
52 else if (drive
->media
== ide_floppy
&& drq_type
== 3)
53 printk(KERN_ERR
"%s: %s: sorry, DRQ type (0x%02x) not "
54 "supported\n", s
, drive
->name
, drq_type
);
55 else if (packet_size
!= 0)
56 printk(KERN_ERR
"%s: %s: packet size (0x%02x) is not 12 "
57 "bytes\n", s
, drive
->name
, packet_size
);
62 EXPORT_SYMBOL_GPL(ide_check_atapi_device
);
64 /* PIO data transfer routine using the scatter gather table. */
65 int ide_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
66 unsigned int bcount
, int write
)
68 ide_hwif_t
*hwif
= drive
->hwif
;
69 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
70 xfer_func_t
*xf
= write
? tp_ops
->output_data
: tp_ops
->input_data
;
71 struct scatterlist
*sg
= pc
->sg
;
76 count
= min(sg
->length
- pc
->b_count
, bcount
);
78 if (PageHighMem(sg_page(sg
))) {
81 local_irq_save(flags
);
82 buf
= kmap_atomic(sg_page(sg
), KM_IRQ0
) + sg
->offset
;
83 xf(drive
, NULL
, buf
+ pc
->b_count
, count
);
84 kunmap_atomic(buf
- sg
->offset
, KM_IRQ0
);
85 local_irq_restore(flags
);
88 xf(drive
, NULL
, buf
+ pc
->b_count
, count
);
95 if (pc
->b_count
== sg
->length
) {
98 pc
->sg
= sg
= sg_next(sg
);
104 printk(KERN_ERR
"%s: %d leftover bytes, %s\n", drive
->name
,
105 bcount
, write
? "padding with zeros"
106 : "discarding data");
107 ide_pad_transfer(drive
, write
, bcount
);
112 EXPORT_SYMBOL_GPL(ide_io_buffers
);
114 void ide_init_pc(struct ide_atapi_pc
*pc
)
116 memset(pc
, 0, sizeof(*pc
));
117 pc
->buf
= pc
->pc_buf
;
118 pc
->buf_size
= IDE_PC_BUFFER_SIZE
;
120 EXPORT_SYMBOL_GPL(ide_init_pc
);
123 * Generate a new packet command request in front of the request queue, before
124 * the current request, so that it will be processed immediately, on the next
125 * pass through the driver.
127 void ide_queue_pc_head(ide_drive_t
*drive
, struct gendisk
*disk
,
128 struct ide_atapi_pc
*pc
, struct request
*rq
)
130 blk_rq_init(NULL
, rq
);
131 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
132 rq
->cmd_flags
|= REQ_PREEMPT
;
133 rq
->buffer
= (char *)pc
;
135 memcpy(rq
->cmd
, pc
->c
, 12);
136 if (drive
->media
== ide_tape
)
137 rq
->cmd
[13] = REQ_IDETAPE_PC1
;
138 ide_do_drive_cmd(drive
, rq
);
140 EXPORT_SYMBOL_GPL(ide_queue_pc_head
);
143 * Add a special packet command request to the tail of the request queue,
144 * and wait for it to be serviced.
146 int ide_queue_pc_tail(ide_drive_t
*drive
, struct gendisk
*disk
,
147 struct ide_atapi_pc
*pc
)
152 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
153 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
154 rq
->buffer
= (char *)pc
;
155 memcpy(rq
->cmd
, pc
->c
, 12);
156 if (drive
->media
== ide_tape
)
157 rq
->cmd
[13] = REQ_IDETAPE_PC1
;
158 error
= blk_execute_rq(drive
->queue
, disk
, rq
, 0);
163 EXPORT_SYMBOL_GPL(ide_queue_pc_tail
);
165 int ide_do_test_unit_ready(ide_drive_t
*drive
, struct gendisk
*disk
)
167 struct ide_atapi_pc pc
;
170 pc
.c
[0] = TEST_UNIT_READY
;
172 return ide_queue_pc_tail(drive
, disk
, &pc
);
174 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready
);
176 int ide_do_start_stop(ide_drive_t
*drive
, struct gendisk
*disk
, int start
)
178 struct ide_atapi_pc pc
;
181 pc
.c
[0] = START_STOP
;
184 if (drive
->media
== ide_tape
)
185 pc
.flags
|= PC_FLAG_WAIT_FOR_DSC
;
187 return ide_queue_pc_tail(drive
, disk
, &pc
);
189 EXPORT_SYMBOL_GPL(ide_do_start_stop
);
191 int ide_set_media_lock(ide_drive_t
*drive
, struct gendisk
*disk
, int on
)
193 struct ide_atapi_pc pc
;
195 if (drive
->atapi_flags
& IDE_AFLAG_NO_DOORLOCK
)
199 pc
.c
[0] = ALLOW_MEDIUM_REMOVAL
;
202 return ide_queue_pc_tail(drive
, disk
, &pc
);
204 EXPORT_SYMBOL_GPL(ide_set_media_lock
);
206 /* TODO: unify the code thus making some arguments go away */
207 ide_startstop_t
ide_pc_intr(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
208 ide_handler_t
*handler
, unsigned int timeout
, ide_expiry_t
*expiry
,
209 void (*update_buffers
)(ide_drive_t
*, struct ide_atapi_pc
*),
210 void (*retry_pc
)(ide_drive_t
*), void (*dsc_handle
)(ide_drive_t
*),
211 int (*io_buffers
)(ide_drive_t
*, struct ide_atapi_pc
*, unsigned, int))
213 ide_hwif_t
*hwif
= drive
->hwif
;
214 struct request
*rq
= hwif
->hwgroup
->rq
;
215 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
216 xfer_func_t
*xferfunc
;
219 u8 stat
, ireason
, scsi
= drive
->scsi
;
221 debug_log("Enter %s - interrupt handler\n", __func__
);
223 if (pc
->flags
& PC_FLAG_TIMEDOUT
) {
224 drive
->pc_callback(drive
);
228 /* Clear the interrupt */
229 stat
= tp_ops
->read_status(hwif
);
231 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
232 if (hwif
->dma_ops
->dma_end(drive
) ||
233 (drive
->media
== ide_tape
&& !scsi
&& (stat
& ATA_ERR
))) {
234 if (drive
->media
== ide_floppy
&& !scsi
)
235 printk(KERN_ERR
"%s: DMA %s error\n",
236 drive
->name
, rq_data_dir(pc
->rq
)
238 pc
->flags
|= PC_FLAG_DMA_ERROR
;
240 pc
->xferred
= pc
->req_xfer
;
242 update_buffers(drive
, pc
);
244 debug_log("%s: DMA finished\n", drive
->name
);
247 /* No more interrupts */
248 if ((stat
& ATA_DRQ
) == 0) {
249 debug_log("Packet command completed, %d bytes transferred\n",
252 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
254 local_irq_enable_in_hardirq();
256 if (drive
->media
== ide_tape
&& !scsi
&&
257 (stat
& ATA_ERR
) && rq
->cmd
[0] == REQUEST_SENSE
)
260 if ((stat
& ATA_ERR
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
262 debug_log("%s: I/O error\n", drive
->name
);
264 if (drive
->media
!= ide_tape
|| scsi
) {
270 if (rq
->cmd
[0] == REQUEST_SENSE
) {
271 printk(KERN_ERR
"%s: I/O error in request sense"
272 " command\n", drive
->name
);
273 return ide_do_reset(drive
);
276 debug_log("[cmd %x]: check condition\n", rq
->cmd
[0]);
278 /* Retry operation */
281 /* queued, but not started */
286 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) &&
287 (stat
& ATA_DSC
) == 0) {
292 /* Command finished - Call the callback function */
293 drive
->pc_callback(drive
);
298 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
299 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
300 printk(KERN_ERR
"%s: The device wants to issue more interrupts "
301 "in DMA mode\n", drive
->name
);
303 return ide_do_reset(drive
);
306 /* Get the number of bytes to transfer on this interrupt. */
307 ide_read_bcount_and_ireason(drive
, &bcount
, &ireason
);
309 if (ireason
& ATAPI_COD
) {
310 printk(KERN_ERR
"%s: CoD != 0 in %s\n", drive
->name
, __func__
);
311 return ide_do_reset(drive
);
314 if (((ireason
& ATAPI_IO
) == ATAPI_IO
) ==
315 !!(pc
->flags
& PC_FLAG_WRITING
)) {
316 /* Hopefully, we will never get here */
317 printk(KERN_ERR
"%s: We wanted to %s, but the device wants us "
318 "to %s!\n", drive
->name
,
319 (ireason
& ATAPI_IO
) ? "Write" : "Read",
320 (ireason
& ATAPI_IO
) ? "Read" : "Write");
321 return ide_do_reset(drive
);
324 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
325 /* Reading - Check that we have enough space */
326 temp
= pc
->xferred
+ bcount
;
327 if (temp
> pc
->req_xfer
) {
328 if (temp
> pc
->buf_size
) {
329 printk(KERN_ERR
"%s: The device wants to send "
330 "us more data than expected - "
334 temp
= pc
->buf_size
- pc
->xferred
;
339 io_buffers(drive
, pc
, temp
, 0);
341 tp_ops
->input_data(drive
, NULL
,
343 printk(KERN_ERR
"%s: transferred %d of "
350 ide_pad_transfer(drive
, 0, bcount
- temp
);
351 ide_set_handler(drive
, handler
, timeout
,
355 debug_log("The device wants to send us more data than "
356 "expected - allowing transfer\n");
358 xferfunc
= tp_ops
->input_data
;
360 xferfunc
= tp_ops
->output_data
;
362 if ((drive
->media
== ide_floppy
&& !scsi
&& !pc
->buf
) ||
363 (drive
->media
== ide_tape
&& !scsi
&& pc
->bh
) ||
365 int done
= io_buffers(drive
, pc
, bcount
,
366 !!(pc
->flags
& PC_FLAG_WRITING
));
368 /* FIXME: don't do partial completions */
369 if (drive
->media
== ide_floppy
&& !scsi
)
370 ide_end_request(drive
, 1, done
>> 9);
372 xferfunc(drive
, NULL
, pc
->cur_pos
, bcount
);
374 /* Update the current position */
375 pc
->xferred
+= bcount
;
376 pc
->cur_pos
+= bcount
;
378 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
381 /* And set the interrupt handler again */
382 ide_set_handler(drive
, handler
, timeout
, expiry
);
385 EXPORT_SYMBOL_GPL(ide_pc_intr
);
387 static u8
ide_read_ireason(ide_drive_t
*drive
)
391 memset(&task
, 0, sizeof(task
));
392 task
.tf_flags
= IDE_TFLAG_IN_NSECT
;
394 drive
->hwif
->tp_ops
->tf_read(drive
, &task
);
396 return task
.tf
.nsect
& 3;
399 static u8
ide_wait_ireason(ide_drive_t
*drive
, u8 ireason
)
403 while (retries
-- && ((ireason
& ATAPI_COD
) == 0 ||
404 (ireason
& ATAPI_IO
))) {
405 printk(KERN_ERR
"%s: (IO,CoD != (0,1) while issuing "
406 "a packet command, retrying\n", drive
->name
);
408 ireason
= ide_read_ireason(drive
);
410 printk(KERN_ERR
"%s: (IO,CoD != (0,1) while issuing "
411 "a packet command, ignoring\n",
413 ireason
|= ATAPI_COD
;
414 ireason
&= ~ATAPI_IO
;
421 ide_startstop_t
ide_transfer_pc(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
422 ide_handler_t
*handler
, unsigned int timeout
,
423 ide_expiry_t
*expiry
)
425 ide_hwif_t
*hwif
= drive
->hwif
;
426 struct request
*rq
= hwif
->hwgroup
->rq
;
427 ide_startstop_t startstop
;
430 if (ide_wait_stat(&startstop
, drive
, ATA_DRQ
, ATA_BUSY
, WAIT_READY
)) {
431 printk(KERN_ERR
"%s: Strange, packet command initiated yet "
432 "DRQ isn't asserted\n", drive
->name
);
436 ireason
= ide_read_ireason(drive
);
437 if (drive
->media
== ide_tape
&& !drive
->scsi
)
438 ireason
= ide_wait_ireason(drive
, ireason
);
440 if ((ireason
& ATAPI_COD
) == 0 || (ireason
& ATAPI_IO
)) {
441 printk(KERN_ERR
"%s: (IO,CoD) != (0,1) while issuing "
442 "a packet command\n", drive
->name
);
443 return ide_do_reset(drive
);
446 /* Set the interrupt routine */
447 ide_set_handler(drive
, handler
, timeout
, expiry
);
449 /* Begin DMA, if necessary */
450 if (pc
->flags
& PC_FLAG_DMA_OK
) {
451 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
452 hwif
->dma_ops
->dma_start(drive
);
455 /* Send the actual packet */
456 if ((drive
->atapi_flags
& IDE_AFLAG_ZIP_DRIVE
) == 0)
457 hwif
->tp_ops
->output_data(drive
, NULL
, rq
->cmd
, 12);
461 EXPORT_SYMBOL_GPL(ide_transfer_pc
);
463 ide_startstop_t
ide_issue_pc(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
464 ide_handler_t
*handler
, unsigned int timeout
,
465 ide_expiry_t
*expiry
)
467 ide_hwif_t
*hwif
= drive
->hwif
;
471 /* We haven't transferred any data yet */
473 pc
->cur_pos
= pc
->buf
;
475 /* Request to transfer the entire buffer at once */
476 if (drive
->media
== ide_tape
&& !drive
->scsi
)
477 bcount
= pc
->req_xfer
;
479 bcount
= min(pc
->req_xfer
, 63 * 1024);
481 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
482 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
486 if ((pc
->flags
& PC_FLAG_DMA_OK
) && drive
->using_dma
) {
489 dma
= !hwif
->dma_ops
->dma_setup(drive
);
495 pc
->flags
&= ~PC_FLAG_DMA_OK
;
497 ide_pktcmd_tf_load(drive
, drive
->scsi
? 0 : IDE_TFLAG_OUT_DEVICE
,
500 /* Issue the packet command */
501 if (drive
->atapi_flags
& IDE_AFLAG_DRQ_INTERRUPT
) {
502 ide_execute_command(drive
, ATA_CMD_PACKET
, handler
,
506 ide_execute_pkt_cmd(drive
);
507 return (*handler
)(drive
);
510 EXPORT_SYMBOL_GPL(ide_issue_pc
);