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block: convert to pos and nr_sectors accessors
[linux-2.6-block.git] / drivers / block / paride / pcd.c
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1da177e4
LT		 1/*
2 pcd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 This is a high-level driver for parallel port ATAPI CD-ROM
6 drives based on chips supported by the paride module.
7
8 By default, the driver will autoprobe for a single parallel
9 port ATAPI CD-ROM drive, but if their individual parameters are
10 specified, the driver can handle up to 4 drives.
11
12 The behaviour of the pcd driver can be altered by setting
13 some parameters from the insmod command line. The following
14 parameters are adjustable:
15
16 drive0 These four arguments can be arrays of
17 drive1 1-6 integers as follows:
18 drive2
19 drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
20
21 Where,
22
23 <prt> is the base of the parallel port address for
24 the corresponding drive. (required)
25
26 <pro> is the protocol number for the adapter that
27 supports this drive. These numbers are
28 logged by 'paride' when the protocol modules
29 are initialised. (0 if not given)
30
31 <uni> for those adapters that support chained
32 devices, this is the unit selector for the
33 chain of devices on the given port. It should
34 be zero for devices that don't support chaining.
35 (0 if not given)
36
37 <mod> this can be -1 to choose the best mode, or one
38 of the mode numbers supported by the adapter.
39 (-1 if not given)
40
41 <slv> ATAPI CD-ROMs can be jumpered to master or slave.
42 Set this to 0 to choose the master drive, 1 to
43 choose the slave, -1 (the default) to choose the
44 first drive found.
45
46 <dly> some parallel ports require the driver to
47 go more slowly. -1 sets a default value that
48 should work with the chosen protocol. Otherwise,
49 set this to a small integer, the larger it is
50 the slower the port i/o. In some cases, setting
51 this to zero will speed up the device. (default -1)
52
53 major You may use this parameter to overide the
54 default major number (46) that this driver
55 will use. Be sure to change the device
56 name as well.
57
58 name This parameter is a character string that
59 contains the name the kernel will use for this
60 device (in /proc output, for instance).
61 (default "pcd")
62
63 verbose This parameter controls the amount of logging
64 that the driver will do. Set it to 0 for
65 normal operation, 1 to see autoprobe progress
66 messages, or 2 to see additional debugging
67 output. (default 0)
68
69 nice This parameter controls the driver's use of
70 idle CPU time, at the expense of some speed.
71
72 If this driver is built into the kernel, you can use kernel
73 the following command line parameters, with the same values
74 as the corresponding module parameters listed above:
75
76 pcd.drive0
77 pcd.drive1
78 pcd.drive2
79 pcd.drive3
80 pcd.nice
81
82 In addition, you can use the parameter pcd.disable to disable
83 the driver entirely.
84
85*/
86
87/* Changes:
88
89 1.01 GRG 1998.01.24 Added test unit ready support
90 1.02 GRG 1998.05.06 Changes to pcd_completion, ready_wait,
91 and loosen interpretation of ATAPI
92 standard for clearing error status.
93 Use spinlocks. Eliminate sti().
94 1.03 GRG 1998.06.16 Eliminated an Ugh
95 1.04 GRG 1998.08.15 Added extra debugging, improvements to
96 pcd_completion, use HZ in loop timing
97 1.05 GRG 1998.08.16 Conformed to "Uniform CD-ROM" standard
98 1.06 GRG 1998.08.19 Added audio ioctl support
99 1.07 GRG 1998.09.24 Increased reset timeout, added jumbo support
100
101*/
102
103#define PCD_VERSION "1.07"
104#define PCD_MAJOR 46
105#define PCD_NAME "pcd"
106#define PCD_UNITS 4
107
108/* Here are things one can override from the insmod command.
109 Most are autoprobed by paride unless set here. Verbose is off
110 by default.
111
112*/
113
114static int verbose = 0;
115static int major = PCD_MAJOR;
116static char *name = PCD_NAME;
117static int nice = 0;
118static int disable = 0;
119
120static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
121static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
122static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
123static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
124
125static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
126static int pcd_drive_count;
127
128enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
129
130/* end of parameters */
131
132#include <linux/module.h>
133#include <linux/init.h>
134#include <linux/errno.h>
135#include <linux/fs.h>
136#include <linux/kernel.h>
137#include <linux/delay.h>
138#include <linux/cdrom.h>
139#include <linux/spinlock.h>
140#include <linux/blkdev.h>
141#include <asm/uaccess.h>
142
671d40f4 143static DEFINE_SPINLOCK(pcd_lock);
1da177e4
LT		 144
145module_param(verbose, bool, 0644);
146module_param(major, int, 0);
147module_param(name, charp, 0);
148module_param(nice, int, 0);
149module_param_array(drive0, int, NULL, 0);
150module_param_array(drive1, int, NULL, 0);
151module_param_array(drive2, int, NULL, 0);
152module_param_array(drive3, int, NULL, 0);
153
154#include "paride.h"
155#include "pseudo.h"
156
157#define PCD_RETRIES 5
158#define PCD_TMO 800 /* timeout in jiffies */
159#define PCD_DELAY 50 /* spin delay in uS */
160#define PCD_READY_TMO 20 /* in seconds */
161#define PCD_RESET_TMO 100 /* in tenths of a second */
162
163#define PCD_SPIN (1000000*PCD_TMO)/(HZ*PCD_DELAY)
164
165#define IDE_ERR 0x01
166#define IDE_DRQ 0x08
167#define IDE_READY 0x40
168#define IDE_BUSY 0x80
169
170static int pcd_open(struct cdrom_device_info *cdi, int purpose);
171static void pcd_release(struct cdrom_device_info *cdi);
172static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr);
173static int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr);
174static int pcd_tray_move(struct cdrom_device_info *cdi, int position);
175static int pcd_lock_door(struct cdrom_device_info *cdi, int lock);
176static int pcd_drive_reset(struct cdrom_device_info *cdi);
177static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn);
178static int pcd_audio_ioctl(struct cdrom_device_info *cdi,
179 unsigned int cmd, void *arg);
180static int pcd_packet(struct cdrom_device_info *cdi,
181 struct packet_command *cgc);
182
183static int pcd_detect(void);
184static void pcd_probe_capabilities(void);
185static void do_pcd_read_drq(void);
165125e1 186static void do_pcd_request(struct request_queue * q);
1da177e4
LT		 187static void do_pcd_read(void);
188
189struct pcd_unit {
190 struct pi_adapter pia; /* interface to paride layer */
191 struct pi_adapter *pi;
192 int drive; /* master/slave */
193 int last_sense; /* result of last request sense */
194 int changed; /* media change seen */
195 int present; /* does this unit exist ? */
196 char *name; /* pcd0, pcd1, etc */
197 struct cdrom_device_info info; /* uniform cdrom interface */
198 struct gendisk *disk;
199};
200
201static struct pcd_unit pcd[PCD_UNITS];
202
203static char pcd_scratch[64];
204static char pcd_buffer[2048]; /* raw block buffer */
205static int pcd_bufblk = -1; /* block in buffer, in CD units,
206 -1 for nothing there. See also
207 pd_unit.
208 */
209
210/* the variables below are used mainly in the I/O request engine, which
211 processes only one request at a time.
212*/
213
214static struct pcd_unit *pcd_current; /* current request's drive */
215static struct request *pcd_req;
216static int pcd_retries; /* retries on current request */
217static int pcd_busy; /* request being processed ? */
218static int pcd_sector; /* address of next requested sector */
219static int pcd_count; /* number of blocks still to do */
220static char *pcd_buf; /* buffer for request in progress */
221
222static int pcd_warned; /* Have we logged a phase warning ? */
223
224/* kernel glue structures */
225
c9acf903 226static int pcd_block_open(struct block_device *bdev, fmode_t mode)
1da177e4 227{
c9acf903
AV		 228 struct pcd_unit *cd = bdev->bd_disk->private_data;
229 return cdrom_open(&cd->info, bdev, mode);
1da177e4
LT		 230}
231
c9acf903 232static int pcd_block_release(struct gendisk *disk, fmode_t mode)
1da177e4 233{
c9acf903
AV		 234 struct pcd_unit *cd = disk->private_data;
235 cdrom_release(&cd->info, mode);
bbc1cc97 236 return 0;
1da177e4
LT		 237}
238
c9acf903 239static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 240 unsigned cmd, unsigned long arg)
241{
c9acf903
AV		 242 struct pcd_unit *cd = bdev->bd_disk->private_data;
243 return cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
1da177e4
LT		 244}
245
246static int pcd_block_media_changed(struct gendisk *disk)
247{
248 struct pcd_unit *cd = disk->private_data;
249 return cdrom_media_changed(&cd->info);
250}
251
252static struct block_device_operations pcd_bdops = {
253 .owner = THIS_MODULE,
c9acf903
AV		 254 .open = pcd_block_open,
255 .release = pcd_block_release,
256 .locked_ioctl = pcd_block_ioctl,
1da177e4
LT		 257 .media_changed = pcd_block_media_changed,
258};
259
260static struct cdrom_device_ops pcd_dops = {
261 .open = pcd_open,
262 .release = pcd_release,
263 .drive_status = pcd_drive_status,
264 .media_changed = pcd_media_changed,
265 .tray_move = pcd_tray_move,
266 .lock_door = pcd_lock_door,
267 .get_mcn = pcd_get_mcn,
268 .reset = pcd_drive_reset,
269 .audio_ioctl = pcd_audio_ioctl,
270 .generic_packet = pcd_packet,
271 .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
272 CDC_MCN | CDC_MEDIA_CHANGED | CDC_RESET |
273 CDC_PLAY_AUDIO | CDC_GENERIC_PACKET | CDC_CD_R |
274 CDC_CD_RW,
275};
276
277static void pcd_init_units(void)
278{
279 struct pcd_unit *cd;
280 int unit;
281
282 pcd_drive_count = 0;
283 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
284 struct gendisk *disk = alloc_disk(1);
285 if (!disk)
286 continue;
287 cd->disk = disk;
288 cd->pi = &cd->pia;
289 cd->present = 0;
290 cd->last_sense = 0;
291 cd->changed = 1;
292 cd->drive = (*drives[unit])[D_SLV];
293 if ((*drives[unit])[D_PRT])
294 pcd_drive_count++;
295
296 cd->name = &cd->info.name[0];
297 snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
298 cd->info.ops = &pcd_dops;
299 cd->info.handle = cd;
300 cd->info.speed = 0;
301 cd->info.capacity = 1;
302 cd->info.mask = 0;
303 disk->major = major;
304 disk->first_minor = unit;
305 strcpy(disk->disk_name, cd->name); /* umm... */
306 disk->fops = &pcd_bdops;
307 }
308}
309
310static int pcd_open(struct cdrom_device_info *cdi, int purpose)
311{
312 struct pcd_unit *cd = cdi->handle;
313 if (!cd->present)
314 return -ENODEV;
315 return 0;
316}
317
318static void pcd_release(struct cdrom_device_info *cdi)
319{
320}
321
322static inline int status_reg(struct pcd_unit *cd)
323{
324 return pi_read_regr(cd->pi, 1, 6);
325}
326
327static inline int read_reg(struct pcd_unit *cd, int reg)
328{
329 return pi_read_regr(cd->pi, 0, reg);
330}
331
332static inline void write_reg(struct pcd_unit *cd, int reg, int val)
333{
334 pi_write_regr(cd->pi, 0, reg, val);
335}
336
337static int pcd_wait(struct pcd_unit *cd, int go, int stop, char *fun, char *msg)
338{
339 int j, r, e, s, p;
340
341 j = 0;
342 while ((((r = status_reg(cd)) & go) || (stop && (!(r & stop))))
343 && (j++ < PCD_SPIN))
344 udelay(PCD_DELAY);
345
346 if ((r & (IDE_ERR & stop)) || (j >= PCD_SPIN)) {
347 s = read_reg(cd, 7);
348 e = read_reg(cd, 1);
349 p = read_reg(cd, 2);
350 if (j >= PCD_SPIN)
351 e |= 0x100;
352 if (fun)
353 printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
354 " loop=%d phase=%d\n",
355 cd->name, fun, msg, r, s, e, j, p);
356 return (s << 8) + r;
357 }
358 return 0;
359}
360
361static int pcd_command(struct pcd_unit *cd, char *cmd, int dlen, char *fun)
362{
363 pi_connect(cd->pi);
364
365 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
366
367 if (pcd_wait(cd, IDE_BUSY | IDE_DRQ, 0, fun, "before command")) {
368 pi_disconnect(cd->pi);
369 return -1;
370 }
371
372 write_reg(cd, 4, dlen % 256);
373 write_reg(cd, 5, dlen / 256);
374 write_reg(cd, 7, 0xa0); /* ATAPI packet command */
375
376 if (pcd_wait(cd, IDE_BUSY, IDE_DRQ, fun, "command DRQ")) {
377 pi_disconnect(cd->pi);
378 return -1;
379 }
380
381 if (read_reg(cd, 2) != 1) {
382 printk("%s: %s: command phase error\n", cd->name, fun);
383 pi_disconnect(cd->pi);
384 return -1;
385 }
386
387 pi_write_block(cd->pi, cmd, 12);
388
389 return 0;
390}
391
392static int pcd_completion(struct pcd_unit *cd, char *buf, char *fun)
393{
394 int r, d, p, n, k, j;
395
396 r = -1;
397 k = 0;
398 j = 0;
399
400 if (!pcd_wait(cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR,
401 fun, "completion")) {
402 r = 0;
403 while (read_reg(cd, 7) & IDE_DRQ) {
404 d = read_reg(cd, 4) + 256 * read_reg(cd, 5);
405 n = (d + 3) & 0xfffc;
406 p = read_reg(cd, 2) & 3;
407
408 if ((p == 2) && (n > 0) && (j == 0)) {
409 pi_read_block(cd->pi, buf, n);
410 if (verbose > 1)
411 printk("%s: %s: Read %d bytes\n",
412 cd->name, fun, n);
413 r = 0;
414 j++;
415 } else {
416 if (verbose > 1)
417 printk
418 ("%s: %s: Unexpected phase %d, d=%d, k=%d\n",
419 cd->name, fun, p, d, k);
420 if ((verbose < 2) && !pcd_warned) {
421 pcd_warned = 1;
422 printk
423 ("%s: WARNING: ATAPI phase errors\n",
424 cd->name);
425 }
426 mdelay(1);
427 }
428 if (k++ > PCD_TMO) {
429 printk("%s: Stuck DRQ\n", cd->name);
430 break;
431 }
432 if (pcd_wait
433 (cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR, fun,
434 "completion")) {
435 r = -1;
436 break;
437 }
438 }
439 }
440
441 pi_disconnect(cd->pi);
442
443 return r;
444}
445
446static void pcd_req_sense(struct pcd_unit *cd, char *fun)
447{
448 char rs_cmd[12] = { 0x03, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
449 char buf[16];
450 int r, c;
451
452 r = pcd_command(cd, rs_cmd, 16, "Request sense");
453 mdelay(1);
454 if (!r)
455 pcd_completion(cd, buf, "Request sense");
456
457 cd->last_sense = -1;
458 c = 2;
459 if (!r) {
460 if (fun)
461 printk("%s: %s: Sense key: %x, ASC: %x, ASQ: %x\n",
462 cd->name, fun, buf[2] & 0xf, buf[12], buf[13]);
463 c = buf[2] & 0xf;
464 cd->last_sense =
465 c | ((buf[12] & 0xff) << 8) | ((buf[13] & 0xff) << 16);
466 }
467 if ((c == 2) || (c == 6))
468 cd->changed = 1;
469}
470
471static int pcd_atapi(struct pcd_unit *cd, char *cmd, int dlen, char *buf, char *fun)
472{
473 int r;
474
475 r = pcd_command(cd, cmd, dlen, fun);
476 mdelay(1);
477 if (!r)
478 r = pcd_completion(cd, buf, fun);
479 if (r)
480 pcd_req_sense(cd, fun);
481
482 return r;
483}
484
485static int pcd_packet(struct cdrom_device_info *cdi, struct packet_command *cgc)
486{
487 return pcd_atapi(cdi->handle, cgc->cmd, cgc->buflen, cgc->buffer,
488 "generic packet");
489}
490
491#define DBMSG(msg) ((verbose>1)?(msg):NULL)
492
493static int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr)
494{
495 struct pcd_unit *cd = cdi->handle;
496 int res = cd->changed;
497 if (res)
498 cd->changed = 0;
499 return res;
500}
501
502static int pcd_lock_door(struct cdrom_device_info *cdi, int lock)
503{
504 char un_cmd[12] = { 0x1e, 0, 0, 0, lock, 0, 0, 0, 0, 0, 0, 0 };
505
506 return pcd_atapi(cdi->handle, un_cmd, 0, pcd_scratch,
507 lock ? "lock door" : "unlock door");
508}
509
510static int pcd_tray_move(struct cdrom_device_info *cdi, int position)
511{
512 char ej_cmd[12] = { 0x1b, 0, 0, 0, 3 - position, 0, 0, 0, 0, 0, 0, 0 };
513
514 return pcd_atapi(cdi->handle, ej_cmd, 0, pcd_scratch,
515 position ? "eject" : "close tray");
516}
517
518static void pcd_sleep(int cs)
519{
86e84862 520 schedule_timeout_interruptible(cs);
1da177e4
LT		 521}
522
523static int pcd_reset(struct pcd_unit *cd)
524{
525 int i, k, flg;
526 int expect[5] = { 1, 1, 1, 0x14, 0xeb };
527
528 pi_connect(cd->pi);
529 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
530 write_reg(cd, 7, 8);
531
532 pcd_sleep(20 * HZ / 1000); /* delay a bit */
533
534 k = 0;
535 while ((k++ < PCD_RESET_TMO) && (status_reg(cd) & IDE_BUSY))
536 pcd_sleep(HZ / 10);
537
538 flg = 1;
539 for (i = 0; i < 5; i++)
540 flg &= (read_reg(cd, i + 1) == expect[i]);
541
542 if (verbose) {
543 printk("%s: Reset (%d) signature = ", cd->name, k);
544 for (i = 0; i < 5; i++)
545 printk("%3x", read_reg(cd, i + 1));
546 if (!flg)
547 printk(" (incorrect)");
548 printk("\n");
549 }
550
551 pi_disconnect(cd->pi);
552 return flg - 1;
553}
554
555static int pcd_drive_reset(struct cdrom_device_info *cdi)
556{
557 return pcd_reset(cdi->handle);
558}
559
560static int pcd_ready_wait(struct pcd_unit *cd, int tmo)
561{
562 char tr_cmd[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
563 int k, p;
564
565 k = 0;
566 while (k < tmo) {
567 cd->last_sense = 0;
568 pcd_atapi(cd, tr_cmd, 0, NULL, DBMSG("test unit ready"));
569 p = cd->last_sense;
570 if (!p)
571 return 0;
572 if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
573 return p;
574 k++;
575 pcd_sleep(HZ);
576 }
577 return 0x000020; /* timeout */
578}
579
580static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
581{
582 char rc_cmd[12] = { 0x25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
583 struct pcd_unit *cd = cdi->handle;
584
585 if (pcd_ready_wait(cd, PCD_READY_TMO))
586 return CDS_DRIVE_NOT_READY;
587 if (pcd_atapi(cd, rc_cmd, 8, pcd_scratch, DBMSG("check media")))
588 return CDS_NO_DISC;
589 return CDS_DISC_OK;
590}
591
592static int pcd_identify(struct pcd_unit *cd, char *id)
593{
594 int k, s;
595 char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
596
597 pcd_bufblk = -1;
598
599 s = pcd_atapi(cd, id_cmd, 36, pcd_buffer, "identify");
600
601 if (s)
602 return -1;
603 if ((pcd_buffer[0] & 0x1f) != 5) {
604 if (verbose)
605 printk("%s: %s is not a CD-ROM\n",
606 cd->name, cd->drive ? "Slave" : "Master");
607 return -1;
608 }
609 memcpy(id, pcd_buffer + 16, 16);
610 id[16] = 0;
611 k = 16;
612 while ((k >= 0) && (id[k] <= 0x20)) {
613 id[k] = 0;
614 k--;
615 }
616
617 printk("%s: %s: %s\n", cd->name, cd->drive ? "Slave" : "Master", id);
618
619 return 0;
620}
621
622/*
623 * returns 0, with id set if drive is detected
624 * -1, if drive detection failed
625 */
626static int pcd_probe(struct pcd_unit *cd, int ms, char *id)
627{
628 if (ms == -1) {
629 for (cd->drive = 0; cd->drive <= 1; cd->drive++)
630 if (!pcd_reset(cd) && !pcd_identify(cd, id))
631 return 0;
632 } else {
633 cd->drive = ms;
634 if (!pcd_reset(cd) && !pcd_identify(cd, id))
635 return 0;
636 }
637 return -1;
638}
639
640static void pcd_probe_capabilities(void)
641{
642 int unit, r;
643 char buffer[32];
644 char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 };
645 struct pcd_unit *cd;
646
647 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
648 if (!cd->present)
649 continue;
650 r = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
651 if (r)
652 continue;
653 /* we should now have the cap page */
654 if ((buffer[11] & 1) == 0)
655 cd->info.mask |= CDC_CD_R;
656 if ((buffer[11] & 2) == 0)
657 cd->info.mask |= CDC_CD_RW;
658 if ((buffer[12] & 1) == 0)
659 cd->info.mask |= CDC_PLAY_AUDIO;
660 if ((buffer[14] & 1) == 0)
661 cd->info.mask |= CDC_LOCK;
662 if ((buffer[14] & 8) == 0)
663 cd->info.mask |= CDC_OPEN_TRAY;
664 if ((buffer[14] >> 6) == 0)
665 cd->info.mask |= CDC_CLOSE_TRAY;
666 }
667}
668
669static int pcd_detect(void)
670{
671 char id[18];
672 int k, unit;
673 struct pcd_unit *cd;
674
675 printk("%s: %s version %s, major %d, nice %d\n",
676 name, name, PCD_VERSION, major, nice);
677
678 k = 0;
679 if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
680 cd = pcd;
681 if (pi_init(cd->pi, 1, -1, -1, -1, -1, -1, pcd_buffer,
682 PI_PCD, verbose, cd->name)) {
683 if (!pcd_probe(cd, -1, id) && cd->disk) {
684 cd->present = 1;
685 k++;
686 } else
687 pi_release(cd->pi);
688 }
689 } else {
690 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
691 int *conf = *drives[unit];
692 if (!conf[D_PRT])
693 continue;
694 if (!pi_init(cd->pi, 0, conf[D_PRT], conf[D_MOD],
695 conf[D_UNI], conf[D_PRO], conf[D_DLY],
696 pcd_buffer, PI_PCD, verbose, cd->name))
697 continue;
698 if (!pcd_probe(cd, conf[D_SLV], id) && cd->disk) {
699 cd->present = 1;
700 k++;
701 } else
702 pi_release(cd->pi);
703 }
704 }
705 if (k)
706 return 0;
707
708 printk("%s: No CD-ROM drive found\n", name);
709 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
710 put_disk(cd->disk);
711 return -1;
712}
713
714/* I/O request processing */
715static struct request_queue *pcd_queue;
716
165125e1 717static void do_pcd_request(struct request_queue * q)
1da177e4
LT		 718{
719 if (pcd_busy)
720 return;
721 while (1) {
722 pcd_req = elv_next_request(q);
723 if (!pcd_req)
724 return;
725
726 if (rq_data_dir(pcd_req) == READ) {
727 struct pcd_unit *cd = pcd_req->rq_disk->private_data;
728 if (cd != pcd_current)
729 pcd_bufblk = -1;
730 pcd_current = cd;
83096ebf
TH		 731 pcd_sector = blk_rq_pos(pcd_req);
732 pcd_count = blk_rq_cur_sectors(pcd_req);
1da177e4
LT		 733 pcd_buf = pcd_req->buffer;
734 pcd_busy = 1;
735 ps_set_intr(do_pcd_read, NULL, 0, nice);
736 return;
737 } else
f06d9a2b 738 __blk_end_request_cur(pcd_req, -EIO);
1da177e4
LT		 739 }
740}
741
f06d9a2b 742static inline void next_request(int err)
1da177e4
LT		 743{
744 unsigned long saved_flags;
745
746 spin_lock_irqsave(&pcd_lock, saved_flags);
f06d9a2b 747 __blk_end_request_cur(pcd_req, err);
1da177e4
LT		 748 pcd_busy = 0;
749 do_pcd_request(pcd_queue);
750 spin_unlock_irqrestore(&pcd_lock, saved_flags);
751}
752
753static int pcd_ready(void)
754{
755 return (((status_reg(pcd_current) & (IDE_BUSY | IDE_DRQ)) == IDE_DRQ));
756}
757
758static void pcd_transfer(void)
759{
760
761 while (pcd_count && (pcd_sector / 4 == pcd_bufblk)) {
762 int o = (pcd_sector % 4) * 512;
763 memcpy(pcd_buf, pcd_buffer + o, 512);
764 pcd_count--;
765 pcd_buf += 512;
766 pcd_sector++;
767 }
768}
769
770static void pcd_start(void)
771{
772 int b, i;
773 char rd_cmd[12] = { 0xa8, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 };
774
775 pcd_bufblk = pcd_sector / 4;
776 b = pcd_bufblk;
777 for (i = 0; i < 4; i++) {
778 rd_cmd[5 - i] = b & 0xff;
779 b = b >> 8;
780 }
781
782 if (pcd_command(pcd_current, rd_cmd, 2048, "read block")) {
783 pcd_bufblk = -1;
f06d9a2b 784 next_request(-EIO);
1da177e4
LT		 785 return;
786 }
787
788 mdelay(1);
789
790 ps_set_intr(do_pcd_read_drq, pcd_ready, PCD_TMO, nice);
791}
792
793static void do_pcd_read(void)
794{
795 pcd_busy = 1;
796 pcd_retries = 0;
797 pcd_transfer();
798 if (!pcd_count) {
f06d9a2b 799 next_request(0);
1da177e4
LT		 800 return;
801 }
802
803 pi_do_claimed(pcd_current->pi, pcd_start);
804}
805
806static void do_pcd_read_drq(void)
807{
808 unsigned long saved_flags;
809
810 if (pcd_completion(pcd_current, pcd_buffer, "read block")) {
811 if (pcd_retries < PCD_RETRIES) {
812 mdelay(1);
813 pcd_retries++;
814 pi_do_claimed(pcd_current->pi, pcd_start);
815 return;
816 }
817 pcd_bufblk = -1;
f06d9a2b 818 next_request(-EIO);
1da177e4
LT		 819 return;
820 }
821
822 do_pcd_read();
823 spin_lock_irqsave(&pcd_lock, saved_flags);
824 do_pcd_request(pcd_queue);
825 spin_unlock_irqrestore(&pcd_lock, saved_flags);
826}
827
828/* the audio_ioctl stuff is adapted from sr_ioctl.c */
829
830static int pcd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
831{
832 struct pcd_unit *cd = cdi->handle;
833
834 switch (cmd) {
835
836 case CDROMREADTOCHDR:
837
838 {
839 char cmd[12] =
840 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
841 0, 0, 0 };
842 struct cdrom_tochdr *tochdr =
843 (struct cdrom_tochdr *) arg;
844 char buffer[32];
845 int r;
846
847 r = pcd_atapi(cd, cmd, 12, buffer, "read toc header");
848
849 tochdr->cdth_trk0 = buffer[2];
850 tochdr->cdth_trk1 = buffer[3];
851
852 return r ? -EIO : 0;
853 }
854
855 case CDROMREADTOCENTRY:
856
857 {
858 char cmd[12] =
859 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
860 0, 0, 0 };
861
862 struct cdrom_tocentry *tocentry =
863 (struct cdrom_tocentry *) arg;
864 unsigned char buffer[32];
865 int r;
866
867 cmd[1] =
868 (tocentry->cdte_format == CDROM_MSF ? 0x02 : 0);
869 cmd[6] = tocentry->cdte_track;
870
871 r = pcd_atapi(cd, cmd, 12, buffer, "read toc entry");
872
873 tocentry->cdte_ctrl = buffer[5] & 0xf;
874 tocentry->cdte_adr = buffer[5] >> 4;
875 tocentry->cdte_datamode =
876 (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
877 if (tocentry->cdte_format == CDROM_MSF) {
878 tocentry->cdte_addr.msf.minute = buffer[9];
879 tocentry->cdte_addr.msf.second = buffer[10];
880 tocentry->cdte_addr.msf.frame = buffer[11];
881 } else
882 tocentry->cdte_addr.lba =
883 (((((buffer[8] << 8) + buffer[9]) << 8)
884 + buffer[10]) << 8) + buffer[11];
885
886 return r ? -EIO : 0;
887 }
888
889 default:
890
891 return -ENOSYS;
892 }
893}
894
895static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
896{
897 char cmd[12] =
898 { GPCMD_READ_SUBCHANNEL, 0, 0x40, 2, 0, 0, 0, 0, 24, 0, 0, 0 };
899 char buffer[32];
900
901 if (pcd_atapi(cdi->handle, cmd, 24, buffer, "get mcn"))
902 return -EIO;
903
904 memcpy(mcn->medium_catalog_number, buffer + 9, 13);
905 mcn->medium_catalog_number[13] = 0;
906
907 return 0;
908}
909
910static int __init pcd_init(void)
911{
912 struct pcd_unit *cd;
913 int unit;
914
915 if (disable)
8bca98ca 916 return -EINVAL;
1da177e4
LT		 917
918 pcd_init_units();
919
920 if (pcd_detect())
8bca98ca 921 return -ENODEV;
1da177e4
LT		 922
923 /* get the atapi capabilities page */
924 pcd_probe_capabilities();
925
926 if (register_blkdev(major, name)) {
927 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
928 put_disk(cd->disk);
8bca98ca 929 return -EBUSY;
1da177e4
LT		 930 }
931
932 pcd_queue = blk_init_queue(do_pcd_request, &pcd_lock);
933 if (!pcd_queue) {
934 unregister_blkdev(major, name);
935 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
936 put_disk(cd->disk);
8bca98ca 937 return -ENOMEM;
1da177e4
LT		 938 }
939
940 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
941 if (cd->present) {
942 register_cdrom(&cd->info);
943 cd->disk->private_data = cd;
944 cd->disk->queue = pcd_queue;
945 add_disk(cd->disk);
946 }
947 }
948
949 return 0;
950}
951
952static void __exit pcd_exit(void)
953{
954 struct pcd_unit *cd;
955 int unit;
956
957 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
958 if (cd->present) {
959 del_gendisk(cd->disk);
960 pi_release(cd->pi);
961 unregister_cdrom(&cd->info);
962 }
963 put_disk(cd->disk);
964 }
965 blk_cleanup_queue(pcd_queue);
966 unregister_blkdev(major, name);
967}
968
969MODULE_LICENSE("GPL");
970module_init(pcd_init)
971module_exit(pcd_exit)
Linux 6.x block layer and io_uring tree(s)