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cdrom: use list_head for cdrom_device_info list
[net-next-2.6.git] / drivers / cdrom / gdrom.c
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74ee1a75
AM		 1/* GD ROM driver for the SEGA Dreamcast
2 * copyright Adrian McMenamin, 2007
3 * With thanks to Marcus Comstedt and Nathan Keynes
4 * for work in reversing PIO and DMA
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 */
21
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/fs.h>
25#include <linux/kernel.h>
26#include <linux/list.h>
27#include <linux/slab.h>
28#include <linux/dma-mapping.h>
29#include <linux/cdrom.h>
30#include <linux/genhd.h>
31#include <linux/bio.h>
32#include <linux/blkdev.h>
33#include <linux/interrupt.h>
34#include <linux/device.h>
35#include <linux/wait.h>
36#include <linux/workqueue.h>
37#include <linux/platform_device.h>
38#include <scsi/scsi.h>
39#include <asm/io.h>
40#include <asm/dma.h>
41#include <asm/delay.h>
42#include <asm/mach/dma.h>
43#include <asm/mach/sysasic.h>
44
45#define GDROM_DEV_NAME "gdrom"
46#define GD_SESSION_OFFSET 150
47
48/* GD Rom commands */
49#define GDROM_COM_SOFTRESET 0x08
50#define GDROM_COM_EXECDIAG 0x90
51#define GDROM_COM_PACKET 0xA0
52#define GDROM_COM_IDDEV 0xA1
53
54/* GD Rom registers */
55#define GDROM_BASE_REG 0xA05F7000
56#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
57#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
58#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
59#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
60#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
61#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
62#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
63#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
64#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
65#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
66
67#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
68#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
69#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
70#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
71#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
72#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
73#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
74
75#define GDROM_HARD_SECTOR 2048
76#define BLOCK_LAYER_SECTOR 512
77#define GD_TO_BLK 4
78
79#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
80
81static const struct {
82 int sense_key;
83 const char * const text;
84} sense_texts[] = {
85 {NO_SENSE, "OK"},
86 {RECOVERED_ERROR, "Recovered from error"},
87 {NOT_READY, "Device not ready"},
88 {MEDIUM_ERROR, "Disk not ready"},
89 {HARDWARE_ERROR, "Hardware error"},
90 {ILLEGAL_REQUEST, "Command has failed"},
91 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
92 {DATA_PROTECT, "Data protection error"},
93 {ABORTED_COMMAND, "Command aborted"},
94};
95
96static struct platform_device *pd;
97static int gdrom_major;
98static DECLARE_WAIT_QUEUE_HEAD(command_queue);
99static DECLARE_WAIT_QUEUE_HEAD(request_queue);
100
101static DEFINE_SPINLOCK(gdrom_lock);
102static void gdrom_readdisk_dma(struct work_struct *work);
103static DECLARE_WORK(work, gdrom_readdisk_dma);
104static LIST_HEAD(gdrom_deferred);
105
106struct gdromtoc {
107 unsigned int entry[99];
108 unsigned int first, last;
109 unsigned int leadout;
110};
111
112static struct gdrom_unit {
113 struct gendisk *disk;
114 struct cdrom_device_info *cd_info;
115 int status;
116 int pending;
117 int transfer;
118 char disk_type;
119 struct gdromtoc *toc;
120 struct request_queue *gdrom_rq;
121} gd;
122
123struct gdrom_id {
124 char mid;
125 char modid;
126 char verid;
127 char padA[13];
128 char mname[16];
129 char modname[16];
130 char firmver[16];
131 char padB[16];
132};
133
134static int gdrom_getsense(short *bufstring);
135static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
136 struct packet_command *command);
137static int gdrom_hardreset(struct cdrom_device_info *cd_info);
138
139static bool gdrom_is_busy(void)
140{
141 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
142}
143
144static bool gdrom_data_request(void)
145{
146 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
147}
148
149static bool gdrom_wait_clrbusy(void)
150{
151 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
152 while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
153 (time_before(jiffies, timeout)))
154 cpu_relax();
155 return time_before(jiffies, timeout + 1);
156}
157
158static bool gdrom_wait_busy_sleeps(void)
159{
160 unsigned long timeout;
161 /* Wait to get busy first */
162 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
163 while (!gdrom_is_busy() && time_before(jiffies, timeout))
164 cpu_relax();
165 /* Now wait for busy to clear */
166 return gdrom_wait_clrbusy();
167}
168
169static void gdrom_identifydevice(void *buf)
170{
171 int c;
172 short *data = buf;
173 /* If the device won't clear it has probably
174 * been hit by a serious failure - but we'll
175 * try to return a sense key even so */
176 if (!gdrom_wait_clrbusy()) {
177 gdrom_getsense(NULL);
178 return;
179 }
180 ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
181 if (!gdrom_wait_busy_sleeps()) {
182 gdrom_getsense(NULL);
183 return;
184 }
185 /* now read in the data */
186 for (c = 0; c < 40; c++)
187 data[c] = ctrl_inw(GDROM_DATA_REG);
188}
189
190static void gdrom_spicommand(void *spi_string, int buflen)
191{
192 short *cmd = spi_string;
193 unsigned long timeout;
194
195 /* ensure IRQ_WAIT is set */
196 ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
197 /* specify how many bytes we expect back */
198 ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
199 ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
200 /* other parameters */
201 ctrl_outb(0, GDROM_INTSEC_REG);
202 ctrl_outb(0, GDROM_SECNUM_REG);
203 ctrl_outb(0, GDROM_ERROR_REG);
204 /* Wait until we can go */
205 if (!gdrom_wait_clrbusy()) {
206 gdrom_getsense(NULL);
207 return;
208 }
209 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
210 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
211 while (!gdrom_data_request() && time_before(jiffies, timeout))
212 cpu_relax();
213 if (!time_before(jiffies, timeout + 1)) {
214 gdrom_getsense(NULL);
215 return;
216 }
217 outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
218}
219
220
221/* gdrom_command_executediagnostic:
222 * Used to probe for presence of working GDROM
223 * Restarts GDROM device and then applies standard ATA 3
224 * Execute Diagnostic Command: a return of '1' indicates device 0
225 * present and device 1 absent
226 */
227static char gdrom_execute_diagnostic(void)
228{
229 gdrom_hardreset(gd.cd_info);
230 if (!gdrom_wait_clrbusy())
231 return 0;
232 ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
233 if (!gdrom_wait_busy_sleeps())
234 return 0;
235 return ctrl_inb(GDROM_ERROR_REG);
236}
237
238/*
239 * Prepare disk command
240 * byte 0 = 0x70
241 * byte 1 = 0x1f
242 */
243static int gdrom_preparedisk_cmd(void)
244{
245 struct packet_command *spin_command;
246 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
247 if (!spin_command)
248 return -ENOMEM;
249 spin_command->cmd[0] = 0x70;
250 spin_command->cmd[2] = 0x1f;
251 spin_command->buflen = 0;
252 gd.pending = 1;
253 gdrom_packetcommand(gd.cd_info, spin_command);
254 /* 60 second timeout */
255 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
256 GDROM_DEFAULT_TIMEOUT);
257 gd.pending = 0;
258 kfree(spin_command);
259 if (gd.status & 0x01) {
260 /* log an error */
261 gdrom_getsense(NULL);
262 return -EIO;
263 }
264 return 0;
265}
266
267/*
268 * Read TOC command
269 * byte 0 = 0x14
270 * byte 1 = session
271 * byte 3 = sizeof TOC >> 8 ie upper byte
272 * byte 4 = sizeof TOC & 0xff ie lower byte
273 */
274static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
275{
276 int tocsize;
277 struct packet_command *toc_command;
278 int err = 0;
279
280 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
281 if (!toc_command)
282 return -ENOMEM;
283 tocsize = sizeof(struct gdromtoc);
284 toc_command->cmd[0] = 0x14;
285 toc_command->cmd[1] = session;
286 toc_command->cmd[3] = tocsize >> 8;
287 toc_command->cmd[4] = tocsize & 0xff;
288 toc_command->buflen = tocsize;
289 if (gd.pending) {
290 err = -EBUSY;
291 goto cleanup_readtoc_final;
292 }
293 gd.pending = 1;
294 gdrom_packetcommand(gd.cd_info, toc_command);
295 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
296 GDROM_DEFAULT_TIMEOUT);
297 if (gd.pending) {
298 err = -EINVAL;
299 goto cleanup_readtoc;
300 }
301 insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
302 if (gd.status & 0x01)
303 err = -EINVAL;
304
305cleanup_readtoc:
306 gd.pending = 0;
307cleanup_readtoc_final:
308 kfree(toc_command);
309 return err;
310}
311
312/* TOC helpers */
313static int get_entry_lba(int track)
314{
315 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
316}
317
318static int get_entry_q_ctrl(int track)
319{
320 return (track & 0x000000f0) >> 4;
321}
322
323static int get_entry_track(int track)
324{
325 return (track & 0x0000ff00) >> 8;
326}
327
328static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
329 struct cdrom_multisession *ms_info)
330{
331 int fentry, lentry, track, data, tocuse, err;
332 if (!gd.toc)
333 return -ENOMEM;
334 tocuse = 1;
335 /* Check if GD-ROM */
336 err = gdrom_readtoc_cmd(gd.toc, 1);
337 /* Not a GD-ROM so check if standard CD-ROM */
338 if (err) {
339 tocuse = 0;
340 err = gdrom_readtoc_cmd(gd.toc, 0);
341 if (err) {
342 printk(KERN_INFO "GDROM: Could not get CD "
343 "table of contents\n");
344 return -ENXIO;
345 }
346 }
347
348 fentry = get_entry_track(gd.toc->first);
349 lentry = get_entry_track(gd.toc->last);
350 /* Find the first data track */
351 track = get_entry_track(gd.toc->last);
352 do {
353 data = gd.toc->entry[track - 1];
354 if (get_entry_q_ctrl(data))
355 break; /* ie a real data track */
356 track--;
357 } while (track >= fentry);
358
359 if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
360 printk(KERN_INFO "GDROM: No data on the last "
361 "session of the CD\n");
362 gdrom_getsense(NULL);
363 return -ENXIO;
364 }
365
366 ms_info->addr_format = CDROM_LBA;
367 ms_info->addr.lba = get_entry_lba(data);
368 ms_info->xa_flag = 1;
369 return 0;
370}
371
372static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
373{
374 /* spin up the disk */
375 return gdrom_preparedisk_cmd();
376}
377
378/* this function is required even if empty */
379static void gdrom_release(struct cdrom_device_info *cd_info)
380{
381}
382
383static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
384{
385 /* read the sense key */
386 char sense = ctrl_inb(GDROM_ERROR_REG);
387 sense &= 0xF0;
388 if (sense == 0)
389 return CDS_DISC_OK;
390 if (sense == 0x20)
391 return CDS_DRIVE_NOT_READY;
392 /* default */
393 return CDS_NO_INFO;
394}
395
396static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
397{
398 /* check the sense key */
399 return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
400}
401
402/* reset the G1 bus */
403static int gdrom_hardreset(struct cdrom_device_info *cd_info)
404{
405 int count;
406 ctrl_outl(0x1fffff, GDROM_RESET_REG);
407 for (count = 0xa0000000; count < 0xa0200000; count += 4)
408 ctrl_inl(count);
409 return 0;
410}
411
412/* keep the function looking like the universal
413 * CD Rom specification - returning int */
414static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
415 struct packet_command *command)
416{
417 gdrom_spicommand(&command->cmd, command->buflen);
418 return 0;
419}
420
421/* Get Sense SPI command
422 * From Marcus Comstedt
423 * cmd = 0x13
424 * cmd + 4 = length of returned buffer
425 * Returns 5 16 bit words
426 */
427static int gdrom_getsense(short *bufstring)
428{
429 struct packet_command *sense_command;
430 short sense[5];
431 int sense_key;
432 int err = -EIO;
433
434 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
435 if (!sense_command)
436 return -ENOMEM;
437 sense_command->cmd[0] = 0x13;
438 sense_command->cmd[4] = 10;
439 sense_command->buflen = 10;
440 /* even if something is pending try to get
441 * the sense key if possible */
442 if (gd.pending && !gdrom_wait_clrbusy()) {
443 err = -EBUSY;
444 goto cleanup_sense_final;
445 }
446 gd.pending = 1;
447 gdrom_packetcommand(gd.cd_info, sense_command);
448 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
449 GDROM_DEFAULT_TIMEOUT);
450 if (gd.pending)
451 goto cleanup_sense;
452 insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
453 if (sense[1] & 40) {
454 printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
455 goto cleanup_sense;
456 }
457 sense_key = sense[1] & 0x0F;
458 if (sense_key < ARRAY_SIZE(sense_texts))
459 printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
460 else
461 printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
462 if (bufstring) /* return addional sense data */
463 memcpy(bufstring, &sense[4], 2);
464 if (sense_key < 2)
465 err = 0;
466
467cleanup_sense:
468 gd.pending = 0;
469cleanup_sense_final:
470 kfree(sense_command);
471 return err;
472}
473
474static struct cdrom_device_ops gdrom_ops = {
475 .open = gdrom_open,
476 .release = gdrom_release,
477 .drive_status = gdrom_drivestatus,
478 .media_changed = gdrom_mediachanged,
479 .get_last_session = gdrom_get_last_session,
480 .reset = gdrom_hardreset,
481 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
482 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
483 .n_minors = 1,
484};
485
486static int gdrom_bdops_open(struct inode *inode, struct file *file)
487{
488 return cdrom_open(gd.cd_info, inode, file);
489}
490
491static int gdrom_bdops_release(struct inode *inode, struct file *file)
492{
493 return cdrom_release(gd.cd_info, file);
494}
495
496static int gdrom_bdops_mediachanged(struct gendisk *disk)
497{
498 return cdrom_media_changed(gd.cd_info);
499}
500
501static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
502 unsigned cmd, unsigned long arg)
503{
504 return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
505}
506
507static struct block_device_operations gdrom_bdops = {
508 .owner = THIS_MODULE,
509 .open = gdrom_bdops_open,
510 .release = gdrom_bdops_release,
511 .media_changed = gdrom_bdops_mediachanged,
512 .ioctl = gdrom_bdops_ioctl,
513};
514
515static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
516{
517 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
518 if (gd.pending != 1)
519 return IRQ_HANDLED;
520 gd.pending = 0;
521 wake_up_interruptible(&command_queue);
522 return IRQ_HANDLED;
523}
524
525static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
526{
527 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
528 if (gd.transfer != 1)
529 return IRQ_HANDLED;
530 gd.transfer = 0;
531 wake_up_interruptible(&request_queue);
532 return IRQ_HANDLED;
533}
534
535static int __devinit gdrom_set_interrupt_handlers(void)
536{
537 int err;
538
539 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
540 IRQF_DISABLED, "gdrom_command", &gd);
541 if (err)
542 return err;
543 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
544 IRQF_DISABLED, "gdrom_dma", &gd);
545 if (err)
546 free_irq(HW_EVENT_GDROM_CMD, &gd);
547 return err;
548}
549
550/* Implement DMA read using SPI command
551 * 0 -> 0x30
552 * 1 -> mode
553 * 2 -> block >> 16
554 * 3 -> block >> 8
555 * 4 -> block
556 * 8 -> sectors >> 16
557 * 9 -> sectors >> 8
558 * 10 -> sectors
559 */
560static void gdrom_readdisk_dma(struct work_struct *work)
561{
562 int err, block, block_cnt;
563 struct packet_command *read_command;
564 struct list_head *elem, *next;
565 struct request *req;
566 unsigned long timeout;
567
568 if (list_empty(&gdrom_deferred))
569 return;
570 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
571 if (!read_command)
572 return; /* get more memory later? */
573 read_command->cmd[0] = 0x30;
574 read_command->cmd[1] = 0x20;
575 spin_lock(&gdrom_lock);
576 list_for_each_safe(elem, next, &gdrom_deferred) {
577 req = list_entry(elem, struct request, queuelist);
578 spin_unlock(&gdrom_lock);
579 block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
580 block_cnt = req->nr_sectors/GD_TO_BLK;
581 ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
582 ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
583 ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
584 ctrl_outl(1, GDROM_DMA_ENABLE_REG);
585 read_command->cmd[2] = (block >> 16) & 0xFF;
586 read_command->cmd[3] = (block >> 8) & 0xFF;
587 read_command->cmd[4] = block & 0xFF;
588 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
589 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
590 read_command->cmd[10] = block_cnt & 0xFF;
591 /* set for DMA */
592 ctrl_outb(1, GDROM_ERROR_REG);
593 /* other registers */
594 ctrl_outb(0, GDROM_SECNUM_REG);
595 ctrl_outb(0, GDROM_BCL_REG);
596 ctrl_outb(0, GDROM_BCH_REG);
597 ctrl_outb(0, GDROM_DSEL_REG);
598 ctrl_outb(0, GDROM_INTSEC_REG);
599 /* Wait for registers to reset after any previous activity */
600 timeout = jiffies + HZ / 2;
601 while (gdrom_is_busy() && time_before(jiffies, timeout))
602 cpu_relax();
603 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
604 timeout = jiffies + HZ / 2;
605 /* Wait for packet command to finish */
606 while (gdrom_is_busy() && time_before(jiffies, timeout))
607 cpu_relax();
608 gd.pending = 1;
609 gd.transfer = 1;
610 outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
611 timeout = jiffies + HZ / 2;
612 /* Wait for any pending DMA to finish */
613 while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
614 time_before(jiffies, timeout))
615 cpu_relax();
616 /* start transfer */
617 ctrl_outb(1, GDROM_DMA_STATUS_REG);
618 wait_event_interruptible_timeout(request_queue,
619 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
620 err = gd.transfer;
621 gd.transfer = 0;
622 gd.pending = 0;
623 /* now seek to take the request spinlock
624 * before handling ending the request */
625 spin_lock(&gdrom_lock);
626 list_del_init(&req->queuelist);
627 end_dequeued_request(req, 1 - err);
628 }
629 spin_unlock(&gdrom_lock);
630 kfree(read_command);
631}
632
633static void gdrom_request_handler_dma(struct request *req)
634{
635 /* dequeue, add to list of deferred work
636 * and then schedule workqueue */
637 blkdev_dequeue_request(req);
638 list_add_tail(&req->queuelist, &gdrom_deferred);
639 schedule_work(&work);
640}
641
642static void gdrom_request(struct request_queue *rq)
643{
644 struct request *req;
645
646 while ((req = elv_next_request(rq)) != NULL) {
647 if (!blk_fs_request(req)) {
648 printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
649 end_request(req, 0);
650 }
651 if (rq_data_dir(req) != READ) {
652 printk(KERN_NOTICE "GDROM: Read only device -");
653 printk(" write request ignored\n");
654 end_request(req, 0);
655 }
656 if (req->nr_sectors)
657 gdrom_request_handler_dma(req);
658 else
659 end_request(req, 0);
660 }
661}
662
663/* Print string identifying GD ROM device */
664static int __devinit gdrom_outputversion(void)
665{
666 struct gdrom_id *id;
667 char *model_name, *manuf_name, *firmw_ver;
668 int err = -ENOMEM;
669
670 /* query device ID */
671 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
672 if (!id)
673 return err;
674 gdrom_identifydevice(id);
675 model_name = kstrndup(id->modname, 16, GFP_KERNEL);
676 if (!model_name)
677 goto free_id;
678 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
679 if (!manuf_name)
680 goto free_model_name;
681 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
682 if (!firmw_ver)
683 goto free_manuf_name;
684 printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
685 model_name, manuf_name, firmw_ver);
686 err = 0;
687 kfree(firmw_ver);
688free_manuf_name:
689 kfree(manuf_name);
690free_model_name:
691 kfree(model_name);
692free_id:
693 kfree(id);
694 return err;
695}
696
697/* set the default mode for DMA transfer */
698static int __devinit gdrom_init_dma_mode(void)
699{
700 ctrl_outb(0x13, GDROM_ERROR_REG);
701 ctrl_outb(0x22, GDROM_INTSEC_REG);
702 if (!gdrom_wait_clrbusy())
703 return -EBUSY;
704 ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
705 if (!gdrom_wait_busy_sleeps())
706 return -EBUSY;
707 /* Memory protection setting for GDROM DMA
708 * Bits 31 - 16 security: 0x8843
709 * Bits 15 and 7 reserved (0)
710 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
711 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
712 * (0x40 | 0x80) = start range at 0x0C000000
713 * (0x7F | 0x80) = end range at 0x0FFFFFFF */
714 ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
715 ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
716 return 0;
717}
718
719static void __devinit probe_gdrom_setupcd(void)
720{
721 gd.cd_info->ops = &gdrom_ops;
722 gd.cd_info->capacity = 1;
723 strcpy(gd.cd_info->name, GDROM_DEV_NAME);
724 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
725 CDC_SELECT_DISC;
726}
727
728static void __devinit probe_gdrom_setupdisk(void)
729{
730 gd.disk->major = gdrom_major;
731 gd.disk->first_minor = 1;
732 gd.disk->minors = 1;
733 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
734}
735
736static int __devinit probe_gdrom_setupqueue(void)
737{
738 blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
739 /* using DMA so memory will need to be contiguous */
740 blk_queue_max_hw_segments(gd.gdrom_rq, 1);
741 /* set a large max size to get most from DMA */
742 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
743 gd.disk->queue = gd.gdrom_rq;
744 return gdrom_init_dma_mode();
745}
746
747/*
748 * register this as a block device and as compliant with the
749 * universal CD Rom driver interface
750 */
751static int __devinit probe_gdrom(struct platform_device *devptr)
752{
753 int err;
754 /* Start the device */
755 if (gdrom_execute_diagnostic() != 1) {
756 printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
757 return -ENODEV;
758 }
759 /* Print out firmware ID */
760 if (gdrom_outputversion())
761 return -ENOMEM;
762 /* Register GDROM */
763 gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
764 if (gdrom_major <= 0)
765 return gdrom_major;
766 printk(KERN_INFO "GDROM: Registered with major number %d\n",
767 gdrom_major);
768 /* Specify basic properties of drive */
769 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
770 if (!gd.cd_info) {
771 err = -ENOMEM;
772 goto probe_fail_no_mem;
773 }
774 probe_gdrom_setupcd();
775 gd.disk = alloc_disk(1);
776 if (!gd.disk) {
777 err = -ENODEV;
778 goto probe_fail_no_disk;
779 }
780 probe_gdrom_setupdisk();
781 if (register_cdrom(gd.cd_info)) {
782 err = -ENODEV;
783 goto probe_fail_cdrom_register;
784 }
785 gd.disk->fops = &gdrom_bdops;
786 /* latch on to the interrupt */
787 err = gdrom_set_interrupt_handlers();
788 if (err)
789 goto probe_fail_cmdirq_register;
790 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
791 if (!gd.gdrom_rq)
792 goto probe_fail_requestq;
793
794 err = probe_gdrom_setupqueue();
795 if (err)
796 goto probe_fail_toc;
797
798 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
799 if (!gd.toc)
800 goto probe_fail_toc;
801 add_disk(gd.disk);
802 return 0;
803
804probe_fail_toc:
805 blk_cleanup_queue(gd.gdrom_rq);
806probe_fail_requestq:
807 free_irq(HW_EVENT_GDROM_DMA, &gd);
808 free_irq(HW_EVENT_GDROM_CMD, &gd);
809probe_fail_cmdirq_register:
810probe_fail_cdrom_register:
811 del_gendisk(gd.disk);
812probe_fail_no_disk:
813 kfree(gd.cd_info);
814 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
815 gdrom_major = 0;
816probe_fail_no_mem:
817 printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
818 return err;
819}
820
821static int __devexit remove_gdrom(struct platform_device *devptr)
822{
823 flush_scheduled_work();
824 blk_cleanup_queue(gd.gdrom_rq);
825 free_irq(HW_EVENT_GDROM_CMD, &gd);
826 free_irq(HW_EVENT_GDROM_DMA, &gd);
827 del_gendisk(gd.disk);
828 if (gdrom_major)
829 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
830 return unregister_cdrom(gd.cd_info);
831}
832
833static struct platform_driver gdrom_driver = {
834 .probe = probe_gdrom,
835 .remove = __devexit_p(remove_gdrom),
836 .driver = {
837 .name = GDROM_DEV_NAME,
838 },
839};
840
841static int __init init_gdrom(void)
842{
843 int rc;
844 gd.toc = NULL;
845 rc = platform_driver_register(&gdrom_driver);
846 if (rc)
847 return rc;
848 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
849 if (IS_ERR(pd)) {
850 platform_driver_unregister(&gdrom_driver);
851 return PTR_ERR(pd);
852 }
853 return 0;
854}
855
856static void __exit exit_gdrom(void)
857{
858 platform_device_unregister(pd);
859 platform_driver_unregister(&gdrom_driver);
860 kfree(gd.toc);
861}
862
863module_init(init_gdrom);
864module_exit(exit_gdrom);
865MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
866MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
867MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree