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[net-next-2.6.git] / drivers / cdrom / gdrom.c
CommitLineData
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>
0764bff4
PM		 42#include <mach/dma.h>
43#include <mach/sysasic.h>
74ee1a75
AM		 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
d15cad5d
BP		 474static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
475 void *arg)
476{
477 return -EINVAL;
478}
479
74ee1a75
AM		 480static struct cdrom_device_ops gdrom_ops = {
481 .open = gdrom_open,
482 .release = gdrom_release,
483 .drive_status = gdrom_drivestatus,
484 .media_changed = gdrom_mediachanged,
485 .get_last_session = gdrom_get_last_session,
486 .reset = gdrom_hardreset,
d15cad5d 487 .audio_ioctl = gdrom_audio_ioctl,
74ee1a75
AM		 488 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
489 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
490 .n_minors = 1,
491};
492
8389feb4 493static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
74ee1a75 494{
8389feb4 495 return cdrom_open(gd.cd_info, bdev, mode);
74ee1a75
AM		 496}
497
8389feb4 498static int gdrom_bdops_release(struct block_device *bdev, fmode_t mode)
74ee1a75 499{
8389feb4 500 return cdrom_release(gd.cd_info, mode);
74ee1a75
AM		 501}
502
503static int gdrom_bdops_mediachanged(struct gendisk *disk)
504{
505 return cdrom_media_changed(gd.cd_info);
506}
507
8389feb4 508static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
74ee1a75
AM		 509 unsigned cmd, unsigned long arg)
510{
8389feb4 511 return cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
74ee1a75
AM		 512}
513
514static struct block_device_operations gdrom_bdops = {
515 .owner = THIS_MODULE,
8389feb4
AV		 516 .open = gdrom_bdops_open,
517 .release = gdrom_bdops_release,
74ee1a75 518 .media_changed = gdrom_bdops_mediachanged,
8389feb4 519 .locked_ioctl = gdrom_bdops_ioctl,
74ee1a75
AM		 520};
521
522static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
523{
524 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
525 if (gd.pending != 1)
526 return IRQ_HANDLED;
527 gd.pending = 0;
528 wake_up_interruptible(&command_queue);
529 return IRQ_HANDLED;
530}
531
532static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
533{
534 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
535 if (gd.transfer != 1)
536 return IRQ_HANDLED;
537 gd.transfer = 0;
538 wake_up_interruptible(&request_queue);
539 return IRQ_HANDLED;
540}
541
542static int __devinit gdrom_set_interrupt_handlers(void)
543{
544 int err;
545
546 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
547 IRQF_DISABLED, "gdrom_command", &gd);
548 if (err)
549 return err;
550 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
551 IRQF_DISABLED, "gdrom_dma", &gd);
552 if (err)
553 free_irq(HW_EVENT_GDROM_CMD, &gd);
554 return err;
555}
556
557/* Implement DMA read using SPI command
558 * 0 -> 0x30
559 * 1 -> mode
560 * 2 -> block >> 16
561 * 3 -> block >> 8
562 * 4 -> block
563 * 8 -> sectors >> 16
564 * 9 -> sectors >> 8
565 * 10 -> sectors
566 */
567static void gdrom_readdisk_dma(struct work_struct *work)
568{
569 int err, block, block_cnt;
570 struct packet_command *read_command;
571 struct list_head *elem, *next;
572 struct request *req;
573 unsigned long timeout;
574
575 if (list_empty(&gdrom_deferred))
576 return;
577 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
578 if (!read_command)
579 return; /* get more memory later? */
580 read_command->cmd[0] = 0x30;
581 read_command->cmd[1] = 0x20;
582 spin_lock(&gdrom_lock);
583 list_for_each_safe(elem, next, &gdrom_deferred) {
584 req = list_entry(elem, struct request, queuelist);
585 spin_unlock(&gdrom_lock);
586 block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
587 block_cnt = req->nr_sectors/GD_TO_BLK;
588 ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
589 ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
590 ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
591 ctrl_outl(1, GDROM_DMA_ENABLE_REG);
592 read_command->cmd[2] = (block >> 16) & 0xFF;
593 read_command->cmd[3] = (block >> 8) & 0xFF;
594 read_command->cmd[4] = block & 0xFF;
595 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
596 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
597 read_command->cmd[10] = block_cnt & 0xFF;
598 /* set for DMA */
599 ctrl_outb(1, GDROM_ERROR_REG);
600 /* other registers */
601 ctrl_outb(0, GDROM_SECNUM_REG);
602 ctrl_outb(0, GDROM_BCL_REG);
603 ctrl_outb(0, GDROM_BCH_REG);
604 ctrl_outb(0, GDROM_DSEL_REG);
605 ctrl_outb(0, GDROM_INTSEC_REG);
606 /* Wait for registers to reset after any previous activity */
607 timeout = jiffies + HZ / 2;
608 while (gdrom_is_busy() && time_before(jiffies, timeout))
609 cpu_relax();
610 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
611 timeout = jiffies + HZ / 2;
612 /* Wait for packet command to finish */
613 while (gdrom_is_busy() && time_before(jiffies, timeout))
614 cpu_relax();
615 gd.pending = 1;
616 gd.transfer = 1;
617 outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
618 timeout = jiffies + HZ / 2;
619 /* Wait for any pending DMA to finish */
620 while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
621 time_before(jiffies, timeout))
622 cpu_relax();
623 /* start transfer */
624 ctrl_outb(1, GDROM_DMA_STATUS_REG);
625 wait_event_interruptible_timeout(request_queue,
626 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
7afb3a6e 627 err = gd.transfer ? -EIO : 0;
74ee1a75
AM		 628 gd.transfer = 0;
629 gd.pending = 0;
630 /* now seek to take the request spinlock
631 * before handling ending the request */
632 spin_lock(&gdrom_lock);
633 list_del_init(&req->queuelist);
7afb3a6e 634 __blk_end_request(req, err, blk_rq_bytes(req));
74ee1a75
AM		 635 }
636 spin_unlock(&gdrom_lock);
637 kfree(read_command);
638}
639
640static void gdrom_request_handler_dma(struct request *req)
641{
642 /* dequeue, add to list of deferred work
643 * and then schedule workqueue */
644 blkdev_dequeue_request(req);
645 list_add_tail(&req->queuelist, &gdrom_deferred);
646 schedule_work(&work);
647}
648
649static void gdrom_request(struct request_queue *rq)
650{
651 struct request *req;
652
653 while ((req = elv_next_request(rq)) != NULL) {
654 if (!blk_fs_request(req)) {
655 printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
656 end_request(req, 0);
657 }
658 if (rq_data_dir(req) != READ) {
659 printk(KERN_NOTICE "GDROM: Read only device -");
660 printk(" write request ignored\n");
661 end_request(req, 0);
662 }
663 if (req->nr_sectors)
664 gdrom_request_handler_dma(req);
665 else
666 end_request(req, 0);
667 }
668}
669
670/* Print string identifying GD ROM device */
671static int __devinit gdrom_outputversion(void)
672{
673 struct gdrom_id *id;
674 char *model_name, *manuf_name, *firmw_ver;
675 int err = -ENOMEM;
676
677 /* query device ID */
678 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
679 if (!id)
680 return err;
681 gdrom_identifydevice(id);
682 model_name = kstrndup(id->modname, 16, GFP_KERNEL);
683 if (!model_name)
684 goto free_id;
685 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
686 if (!manuf_name)
687 goto free_model_name;
688 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
689 if (!firmw_ver)
690 goto free_manuf_name;
691 printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
692 model_name, manuf_name, firmw_ver);
693 err = 0;
694 kfree(firmw_ver);
695free_manuf_name:
696 kfree(manuf_name);
697free_model_name:
698 kfree(model_name);
699free_id:
700 kfree(id);
701 return err;
702}
703
704/* set the default mode for DMA transfer */
705static int __devinit gdrom_init_dma_mode(void)
706{
707 ctrl_outb(0x13, GDROM_ERROR_REG);
708 ctrl_outb(0x22, GDROM_INTSEC_REG);
709 if (!gdrom_wait_clrbusy())
710 return -EBUSY;
711 ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
712 if (!gdrom_wait_busy_sleeps())
713 return -EBUSY;
714 /* Memory protection setting for GDROM DMA
715 * Bits 31 - 16 security: 0x8843
716 * Bits 15 and 7 reserved (0)
717 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
718 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
719 * (0x40 | 0x80) = start range at 0x0C000000
720 * (0x7F | 0x80) = end range at 0x0FFFFFFF */
721 ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
722 ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
723 return 0;
724}
725
726static void __devinit probe_gdrom_setupcd(void)
727{
728 gd.cd_info->ops = &gdrom_ops;
729 gd.cd_info->capacity = 1;
730 strcpy(gd.cd_info->name, GDROM_DEV_NAME);
731 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
732 CDC_SELECT_DISC;
733}
734
735static void __devinit probe_gdrom_setupdisk(void)
736{
737 gd.disk->major = gdrom_major;
738 gd.disk->first_minor = 1;
739 gd.disk->minors = 1;
740 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
741}
742
743static int __devinit probe_gdrom_setupqueue(void)
744{
745 blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
746 /* using DMA so memory will need to be contiguous */
747 blk_queue_max_hw_segments(gd.gdrom_rq, 1);
748 /* set a large max size to get most from DMA */
749 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
750 gd.disk->queue = gd.gdrom_rq;
751 return gdrom_init_dma_mode();
752}
753
754/*
755 * register this as a block device and as compliant with the
756 * universal CD Rom driver interface
757 */
758static int __devinit probe_gdrom(struct platform_device *devptr)
759{
760 int err;
761 /* Start the device */
762 if (gdrom_execute_diagnostic() != 1) {
763 printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
764 return -ENODEV;
765 }
766 /* Print out firmware ID */
767 if (gdrom_outputversion())
768 return -ENOMEM;
769 /* Register GDROM */
770 gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
771 if (gdrom_major <= 0)
772 return gdrom_major;
773 printk(KERN_INFO "GDROM: Registered with major number %d\n",
774 gdrom_major);
775 /* Specify basic properties of drive */
776 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
777 if (!gd.cd_info) {
778 err = -ENOMEM;
779 goto probe_fail_no_mem;
780 }
781 probe_gdrom_setupcd();
782 gd.disk = alloc_disk(1);
783 if (!gd.disk) {
784 err = -ENODEV;
785 goto probe_fail_no_disk;
786 }
787 probe_gdrom_setupdisk();
788 if (register_cdrom(gd.cd_info)) {
789 err = -ENODEV;
790 goto probe_fail_cdrom_register;
791 }
792 gd.disk->fops = &gdrom_bdops;
793 /* latch on to the interrupt */
794 err = gdrom_set_interrupt_handlers();
795 if (err)
796 goto probe_fail_cmdirq_register;
797 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
798 if (!gd.gdrom_rq)
799 goto probe_fail_requestq;
800
801 err = probe_gdrom_setupqueue();
802 if (err)
803 goto probe_fail_toc;
804
805 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
806 if (!gd.toc)
807 goto probe_fail_toc;
808 add_disk(gd.disk);
809 return 0;
810
811probe_fail_toc:
812 blk_cleanup_queue(gd.gdrom_rq);
813probe_fail_requestq:
814 free_irq(HW_EVENT_GDROM_DMA, &gd);
815 free_irq(HW_EVENT_GDROM_CMD, &gd);
816probe_fail_cmdirq_register:
817probe_fail_cdrom_register:
818 del_gendisk(gd.disk);
819probe_fail_no_disk:
820 kfree(gd.cd_info);
821 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
822 gdrom_major = 0;
823probe_fail_no_mem:
824 printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
825 return err;
826}
827
828static int __devexit remove_gdrom(struct platform_device *devptr)
829{
830 flush_scheduled_work();
831 blk_cleanup_queue(gd.gdrom_rq);
832 free_irq(HW_EVENT_GDROM_CMD, &gd);
833 free_irq(HW_EVENT_GDROM_DMA, &gd);
834 del_gendisk(gd.disk);
835 if (gdrom_major)
836 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
0a0c4114
AM		 837 unregister_cdrom(gd.cd_info);
838
839 return 0;
74ee1a75
AM		 840}
841
842static struct platform_driver gdrom_driver = {
843 .probe = probe_gdrom,
844 .remove = __devexit_p(remove_gdrom),
845 .driver = {
846 .name = GDROM_DEV_NAME,
847 },
848};
849
850static int __init init_gdrom(void)
851{
852 int rc;
853 gd.toc = NULL;
854 rc = platform_driver_register(&gdrom_driver);
855 if (rc)
856 return rc;
857 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
858 if (IS_ERR(pd)) {
859 platform_driver_unregister(&gdrom_driver);
860 return PTR_ERR(pd);
861 }
862 return 0;
863}
864
865static void __exit exit_gdrom(void)
866{
867 platform_device_unregister(pd);
868 platform_driver_unregister(&gdrom_driver);
869 kfree(gd.toc);
870}
871
872module_init(init_gdrom);
873module_exit(exit_gdrom);
874MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
875MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
876MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree