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[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
e597cd09
JP		 22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
74ee1a75
AM		 24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/fs.h>
27#include <linux/kernel.h>
28#include <linux/list.h>
29#include <linux/slab.h>
30#include <linux/dma-mapping.h>
31#include <linux/cdrom.h>
32#include <linux/genhd.h>
33#include <linux/bio.h>
34#include <linux/blkdev.h>
35#include <linux/interrupt.h>
36#include <linux/device.h>
2a48fc0a 37#include <linux/mutex.h>
74ee1a75
AM		 38#include <linux/wait.h>
39#include <linux/workqueue.h>
40#include <linux/platform_device.h>
41#include <scsi/scsi.h>
42#include <asm/io.h>
43#include <asm/dma.h>
44#include <asm/delay.h>
0764bff4
PM		 45#include <mach/dma.h>
46#include <mach/sysasic.h>
74ee1a75
AM		 47
48#define GDROM_DEV_NAME "gdrom"
49#define GD_SESSION_OFFSET 150
50
51/* GD Rom commands */
52#define GDROM_COM_SOFTRESET 0x08
53#define GDROM_COM_EXECDIAG 0x90
54#define GDROM_COM_PACKET 0xA0
55#define GDROM_COM_IDDEV 0xA1
56
57/* GD Rom registers */
58#define GDROM_BASE_REG 0xA05F7000
59#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
60#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
61#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
62#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
63#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
64#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
65#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
66#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
67#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
68#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
69
70#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
71#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
72#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
73#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
74#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
75#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
76#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
77
78#define GDROM_HARD_SECTOR 2048
79#define BLOCK_LAYER_SECTOR 512
80#define GD_TO_BLK 4
81
82#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
83
2a48fc0a 84static DEFINE_MUTEX(gdrom_mutex);
74ee1a75
AM		 85static const struct {
86 int sense_key;
87 const char * const text;
88} sense_texts[] = {
89 {NO_SENSE, "OK"},
90 {RECOVERED_ERROR, "Recovered from error"},
91 {NOT_READY, "Device not ready"},
92 {MEDIUM_ERROR, "Disk not ready"},
93 {HARDWARE_ERROR, "Hardware error"},
94 {ILLEGAL_REQUEST, "Command has failed"},
95 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
96 {DATA_PROTECT, "Data protection error"},
97 {ABORTED_COMMAND, "Command aborted"},
98};
99
100static struct platform_device *pd;
101static int gdrom_major;
102static DECLARE_WAIT_QUEUE_HEAD(command_queue);
103static DECLARE_WAIT_QUEUE_HEAD(request_queue);
104
105static DEFINE_SPINLOCK(gdrom_lock);
106static void gdrom_readdisk_dma(struct work_struct *work);
107static DECLARE_WORK(work, gdrom_readdisk_dma);
108static LIST_HEAD(gdrom_deferred);
109
110struct gdromtoc {
111 unsigned int entry[99];
112 unsigned int first, last;
113 unsigned int leadout;
114};
115
116static struct gdrom_unit {
117 struct gendisk *disk;
118 struct cdrom_device_info *cd_info;
119 int status;
120 int pending;
121 int transfer;
122 char disk_type;
123 struct gdromtoc *toc;
124 struct request_queue *gdrom_rq;
125} gd;
126
127struct gdrom_id {
128 char mid;
129 char modid;
130 char verid;
131 char padA[13];
132 char mname[16];
133 char modname[16];
134 char firmver[16];
135 char padB[16];
136};
137
138static int gdrom_getsense(short *bufstring);
139static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
140 struct packet_command *command);
141static int gdrom_hardreset(struct cdrom_device_info *cd_info);
142
143static bool gdrom_is_busy(void)
144{
145 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
146}
147
148static bool gdrom_data_request(void)
149{
150 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
151}
152
153static bool gdrom_wait_clrbusy(void)
154{
155 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
156 while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
157 (time_before(jiffies, timeout)))
158 cpu_relax();
159 return time_before(jiffies, timeout + 1);
160}
161
162static bool gdrom_wait_busy_sleeps(void)
163{
164 unsigned long timeout;
165 /* Wait to get busy first */
166 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
167 while (!gdrom_is_busy() && time_before(jiffies, timeout))
168 cpu_relax();
169 /* Now wait for busy to clear */
170 return gdrom_wait_clrbusy();
171}
172
173static void gdrom_identifydevice(void *buf)
174{
175 int c;
176 short *data = buf;
177 /* If the device won't clear it has probably
178 * been hit by a serious failure - but we'll
179 * try to return a sense key even so */
180 if (!gdrom_wait_clrbusy()) {
181 gdrom_getsense(NULL);
182 return;
183 }
184 ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
185 if (!gdrom_wait_busy_sleeps()) {
186 gdrom_getsense(NULL);
187 return;
188 }
189 /* now read in the data */
190 for (c = 0; c < 40; c++)
191 data[c] = ctrl_inw(GDROM_DATA_REG);
192}
193
194static void gdrom_spicommand(void *spi_string, int buflen)
195{
196 short *cmd = spi_string;
197 unsigned long timeout;
198
199 /* ensure IRQ_WAIT is set */
200 ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
201 /* specify how many bytes we expect back */
202 ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
203 ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
204 /* other parameters */
205 ctrl_outb(0, GDROM_INTSEC_REG);
206 ctrl_outb(0, GDROM_SECNUM_REG);
207 ctrl_outb(0, GDROM_ERROR_REG);
208 /* Wait until we can go */
209 if (!gdrom_wait_clrbusy()) {
210 gdrom_getsense(NULL);
211 return;
212 }
213 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
214 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
215 while (!gdrom_data_request() && time_before(jiffies, timeout))
216 cpu_relax();
217 if (!time_before(jiffies, timeout + 1)) {
218 gdrom_getsense(NULL);
219 return;
220 }
54d5102f 221 outsw(GDROM_DATA_REG, cmd, 6);
74ee1a75
AM		 222}
223
224
225/* gdrom_command_executediagnostic:
226 * Used to probe for presence of working GDROM
227 * Restarts GDROM device and then applies standard ATA 3
228 * Execute Diagnostic Command: a return of '1' indicates device 0
229 * present and device 1 absent
230 */
231static char gdrom_execute_diagnostic(void)
232{
233 gdrom_hardreset(gd.cd_info);
234 if (!gdrom_wait_clrbusy())
235 return 0;
236 ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
237 if (!gdrom_wait_busy_sleeps())
238 return 0;
239 return ctrl_inb(GDROM_ERROR_REG);
240}
241
242/*
243 * Prepare disk command
244 * byte 0 = 0x70
245 * byte 1 = 0x1f
246 */
247static int gdrom_preparedisk_cmd(void)
248{
249 struct packet_command *spin_command;
250 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
251 if (!spin_command)
252 return -ENOMEM;
253 spin_command->cmd[0] = 0x70;
254 spin_command->cmd[2] = 0x1f;
255 spin_command->buflen = 0;
256 gd.pending = 1;
257 gdrom_packetcommand(gd.cd_info, spin_command);
258 /* 60 second timeout */
259 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
260 GDROM_DEFAULT_TIMEOUT);
261 gd.pending = 0;
262 kfree(spin_command);
263 if (gd.status & 0x01) {
264 /* log an error */
265 gdrom_getsense(NULL);
266 return -EIO;
267 }
268 return 0;
269}
270
271/*
272 * Read TOC command
273 * byte 0 = 0x14
274 * byte 1 = session
275 * byte 3 = sizeof TOC >> 8 ie upper byte
276 * byte 4 = sizeof TOC & 0xff ie lower byte
277 */
278static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
279{
280 int tocsize;
281 struct packet_command *toc_command;
282 int err = 0;
283
284 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
285 if (!toc_command)
286 return -ENOMEM;
287 tocsize = sizeof(struct gdromtoc);
288 toc_command->cmd[0] = 0x14;
289 toc_command->cmd[1] = session;
290 toc_command->cmd[3] = tocsize >> 8;
291 toc_command->cmd[4] = tocsize & 0xff;
292 toc_command->buflen = tocsize;
293 if (gd.pending) {
294 err = -EBUSY;
295 goto cleanup_readtoc_final;
296 }
297 gd.pending = 1;
298 gdrom_packetcommand(gd.cd_info, toc_command);
299 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
300 GDROM_DEFAULT_TIMEOUT);
301 if (gd.pending) {
302 err = -EINVAL;
303 goto cleanup_readtoc;
304 }
54d5102f 305 insw(GDROM_DATA_REG, toc, tocsize/2);
74ee1a75
AM		 306 if (gd.status & 0x01)
307 err = -EINVAL;
308
309cleanup_readtoc:
310 gd.pending = 0;
311cleanup_readtoc_final:
312 kfree(toc_command);
313 return err;
314}
315
316/* TOC helpers */
317static int get_entry_lba(int track)
318{
319 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
320}
321
322static int get_entry_q_ctrl(int track)
323{
324 return (track & 0x000000f0) >> 4;
325}
326
327static int get_entry_track(int track)
328{
329 return (track & 0x0000ff00) >> 8;
330}
331
332static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
333 struct cdrom_multisession *ms_info)
334{
335 int fentry, lentry, track, data, tocuse, err;
336 if (!gd.toc)
337 return -ENOMEM;
338 tocuse = 1;
339 /* Check if GD-ROM */
340 err = gdrom_readtoc_cmd(gd.toc, 1);
341 /* Not a GD-ROM so check if standard CD-ROM */
342 if (err) {
343 tocuse = 0;
344 err = gdrom_readtoc_cmd(gd.toc, 0);
345 if (err) {
e597cd09 346 pr_info("Could not get CD table of contents\n");
74ee1a75
AM		 347 return -ENXIO;
348 }
349 }
350
351 fentry = get_entry_track(gd.toc->first);
352 lentry = get_entry_track(gd.toc->last);
353 /* Find the first data track */
354 track = get_entry_track(gd.toc->last);
355 do {
356 data = gd.toc->entry[track - 1];
357 if (get_entry_q_ctrl(data))
358 break; /* ie a real data track */
359 track--;
360 } while (track >= fentry);
361
362 if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
e597cd09 363 pr_info("No data on the last session of the CD\n");
74ee1a75
AM		 364 gdrom_getsense(NULL);
365 return -ENXIO;
366 }
367
368 ms_info->addr_format = CDROM_LBA;
369 ms_info->addr.lba = get_entry_lba(data);
370 ms_info->xa_flag = 1;
371 return 0;
372}
373
374static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
375{
376 /* spin up the disk */
377 return gdrom_preparedisk_cmd();
378}
379
380/* this function is required even if empty */
381static void gdrom_release(struct cdrom_device_info *cd_info)
382{
383}
384
385static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
386{
387 /* read the sense key */
388 char sense = ctrl_inb(GDROM_ERROR_REG);
389 sense &= 0xF0;
390 if (sense == 0)
391 return CDS_DISC_OK;
392 if (sense == 0x20)
393 return CDS_DRIVE_NOT_READY;
394 /* default */
395 return CDS_NO_INFO;
396}
397
398static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
399{
400 /* check the sense key */
401 return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
402}
403
404/* reset the G1 bus */
405static int gdrom_hardreset(struct cdrom_device_info *cd_info)
406{
407 int count;
408 ctrl_outl(0x1fffff, GDROM_RESET_REG);
409 for (count = 0xa0000000; count < 0xa0200000; count += 4)
410 ctrl_inl(count);
411 return 0;
412}
413
414/* keep the function looking like the universal
415 * CD Rom specification - returning int */
416static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
417 struct packet_command *command)
418{
419 gdrom_spicommand(&command->cmd, command->buflen);
420 return 0;
421}
422
423/* Get Sense SPI command
424 * From Marcus Comstedt
425 * cmd = 0x13
426 * cmd + 4 = length of returned buffer
427 * Returns 5 16 bit words
428 */
429static int gdrom_getsense(short *bufstring)
430{
431 struct packet_command *sense_command;
432 short sense[5];
433 int sense_key;
434 int err = -EIO;
435
436 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
437 if (!sense_command)
438 return -ENOMEM;
439 sense_command->cmd[0] = 0x13;
440 sense_command->cmd[4] = 10;
441 sense_command->buflen = 10;
442 /* even if something is pending try to get
443 * the sense key if possible */
444 if (gd.pending && !gdrom_wait_clrbusy()) {
445 err = -EBUSY;
446 goto cleanup_sense_final;
447 }
448 gd.pending = 1;
449 gdrom_packetcommand(gd.cd_info, sense_command);
450 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
451 GDROM_DEFAULT_TIMEOUT);
452 if (gd.pending)
453 goto cleanup_sense;
54d5102f 454 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
74ee1a75 455 if (sense[1] & 40) {
e597cd09 456 pr_info("Drive not ready - command aborted\n");
74ee1a75
AM		 457 goto cleanup_sense;
458 }
459 sense_key = sense[1] & 0x0F;
460 if (sense_key < ARRAY_SIZE(sense_texts))
e597cd09 461 pr_info("%s\n", sense_texts[sense_key].text);
74ee1a75 462 else
e597cd09 463 pr_err("Unknown sense key: %d\n", sense_key);
74ee1a75
AM		 464 if (bufstring) /* return addional sense data */
465 memcpy(bufstring, &sense[4], 2);
466 if (sense_key < 2)
467 err = 0;
468
469cleanup_sense:
470 gd.pending = 0;
471cleanup_sense_final:
472 kfree(sense_command);
473 return err;
474}
475
d15cad5d
BP		 476static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
477 void *arg)
478{
479 return -EINVAL;
480}
481
74ee1a75
AM		 482static struct cdrom_device_ops gdrom_ops = {
483 .open = gdrom_open,
484 .release = gdrom_release,
485 .drive_status = gdrom_drivestatus,
486 .media_changed = gdrom_mediachanged,
487 .get_last_session = gdrom_get_last_session,
488 .reset = gdrom_hardreset,
d15cad5d 489 .audio_ioctl = gdrom_audio_ioctl,
74ee1a75
AM		 490 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
491 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
492 .n_minors = 1,
493};
494
8389feb4 495static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
74ee1a75 496{
6e9624b8 497 int ret;
2a48fc0a 498 mutex_lock(&gdrom_mutex);
6e9624b8 499 ret = cdrom_open(gd.cd_info, bdev, mode);
2a48fc0a 500 mutex_unlock(&gdrom_mutex);
6e9624b8 501 return ret;
74ee1a75
AM		 502}
503
545727f3 504static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
74ee1a75 505{
2a48fc0a 506 mutex_lock(&gdrom_mutex);
545727f3 507 cdrom_release(gd.cd_info, mode);
2a48fc0a 508 mutex_unlock(&gdrom_mutex);
545727f3 509 return 0;
74ee1a75
AM		 510}
511
512static int gdrom_bdops_mediachanged(struct gendisk *disk)
513{
514 return cdrom_media_changed(gd.cd_info);
515}
516
8389feb4 517static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
74ee1a75
AM		 518 unsigned cmd, unsigned long arg)
519{
8a6cfeb6
AB		 520 int ret;
521
2a48fc0a 522 mutex_lock(&gdrom_mutex);
8a6cfeb6 523 ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
2a48fc0a 524 mutex_unlock(&gdrom_mutex);
8a6cfeb6
AB		 525
526 return ret;
74ee1a75
AM		 527}
528
83d5cde4 529static const struct block_device_operations gdrom_bdops = {
74ee1a75 530 .owner = THIS_MODULE,
8389feb4
AV		 531 .open = gdrom_bdops_open,
532 .release = gdrom_bdops_release,
74ee1a75 533 .media_changed = gdrom_bdops_mediachanged,
8a6cfeb6 534 .ioctl = gdrom_bdops_ioctl,
74ee1a75
AM		 535};
536
537static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
538{
539 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
540 if (gd.pending != 1)
541 return IRQ_HANDLED;
542 gd.pending = 0;
543 wake_up_interruptible(&command_queue);
544 return IRQ_HANDLED;
545}
546
547static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
548{
549 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
550 if (gd.transfer != 1)
551 return IRQ_HANDLED;
552 gd.transfer = 0;
553 wake_up_interruptible(&request_queue);
554 return IRQ_HANDLED;
555}
556
557static int __devinit gdrom_set_interrupt_handlers(void)
558{
559 int err;
560
561 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
562 IRQF_DISABLED, "gdrom_command", &gd);
563 if (err)
564 return err;
565 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
566 IRQF_DISABLED, "gdrom_dma", &gd);
567 if (err)
568 free_irq(HW_EVENT_GDROM_CMD, &gd);
569 return err;
570}
571
572/* Implement DMA read using SPI command
573 * 0 -> 0x30
574 * 1 -> mode
575 * 2 -> block >> 16
576 * 3 -> block >> 8
577 * 4 -> block
578 * 8 -> sectors >> 16
579 * 9 -> sectors >> 8
580 * 10 -> sectors
581 */
582static void gdrom_readdisk_dma(struct work_struct *work)
583{
584 int err, block, block_cnt;
585 struct packet_command *read_command;
586 struct list_head *elem, *next;
587 struct request *req;
588 unsigned long timeout;
589
590 if (list_empty(&gdrom_deferred))
591 return;
592 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
593 if (!read_command)
594 return; /* get more memory later? */
595 read_command->cmd[0] = 0x30;
596 read_command->cmd[1] = 0x20;
597 spin_lock(&gdrom_lock);
598 list_for_each_safe(elem, next, &gdrom_deferred) {
599 req = list_entry(elem, struct request, queuelist);
600 spin_unlock(&gdrom_lock);
83096ebf
TH		 601 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
602 block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
54d5102f 603 ctrl_outl(virt_to_phys(req->buffer), GDROM_DMA_STARTADDR_REG);
74ee1a75
AM		 604 ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
605 ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
606 ctrl_outl(1, GDROM_DMA_ENABLE_REG);
607 read_command->cmd[2] = (block >> 16) & 0xFF;
608 read_command->cmd[3] = (block >> 8) & 0xFF;
609 read_command->cmd[4] = block & 0xFF;
610 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
611 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
612 read_command->cmd[10] = block_cnt & 0xFF;
613 /* set for DMA */
614 ctrl_outb(1, GDROM_ERROR_REG);
615 /* other registers */
616 ctrl_outb(0, GDROM_SECNUM_REG);
617 ctrl_outb(0, GDROM_BCL_REG);
618 ctrl_outb(0, GDROM_BCH_REG);
619 ctrl_outb(0, GDROM_DSEL_REG);
620 ctrl_outb(0, GDROM_INTSEC_REG);
621 /* Wait for registers to reset after any previous activity */
622 timeout = jiffies + HZ / 2;
623 while (gdrom_is_busy() && time_before(jiffies, timeout))
624 cpu_relax();
625 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
626 timeout = jiffies + HZ / 2;
627 /* Wait for packet command to finish */
628 while (gdrom_is_busy() && time_before(jiffies, timeout))
629 cpu_relax();
630 gd.pending = 1;
631 gd.transfer = 1;
54d5102f 632 outsw(GDROM_DATA_REG, &read_command->cmd, 6);
74ee1a75
AM		 633 timeout = jiffies + HZ / 2;
634 /* Wait for any pending DMA to finish */
635 while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
636 time_before(jiffies, timeout))
637 cpu_relax();
638 /* start transfer */
639 ctrl_outb(1, GDROM_DMA_STATUS_REG);
640 wait_event_interruptible_timeout(request_queue,
641 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
7afb3a6e 642 err = gd.transfer ? -EIO : 0;
74ee1a75
AM		 643 gd.transfer = 0;
644 gd.pending = 0;
645 /* now seek to take the request spinlock
646 * before handling ending the request */
647 spin_lock(&gdrom_lock);
648 list_del_init(&req->queuelist);
40cbbb78 649 __blk_end_request_all(req, err);
74ee1a75
AM		 650 }
651 spin_unlock(&gdrom_lock);
652 kfree(read_command);
653}
654
74ee1a75
AM		 655static void gdrom_request(struct request_queue *rq)
656{
657 struct request *req;
658
9934c8c0 659 while ((req = blk_fetch_request(rq)) != NULL) {
33659ebb 660 if (req->cmd_type != REQ_TYPE_FS) {
e597cd09 661 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
23430468
TH		 662 __blk_end_request_all(req, -EIO);
663 continue;
74ee1a75
AM		 664 }
665 if (rq_data_dir(req) != READ) {
e597cd09 666 pr_notice("Read only device - write request ignored\n");
23430468
TH		 667 __blk_end_request_all(req, -EIO);
668 continue;
74ee1a75 669 }
23430468
TH		 670
671 /*
672 * Add to list of deferred work and then schedule
673 * workqueue.
674 */
675 list_add_tail(&req->queuelist, &gdrom_deferred);
676 schedule_work(&work);
74ee1a75
AM		 677 }
678}
679
680/* Print string identifying GD ROM device */
681static int __devinit gdrom_outputversion(void)
682{
683 struct gdrom_id *id;
684 char *model_name, *manuf_name, *firmw_ver;
685 int err = -ENOMEM;
686
687 /* query device ID */
688 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
689 if (!id)
690 return err;
691 gdrom_identifydevice(id);
692 model_name = kstrndup(id->modname, 16, GFP_KERNEL);
693 if (!model_name)
694 goto free_id;
695 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
696 if (!manuf_name)
697 goto free_model_name;
698 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
699 if (!firmw_ver)
700 goto free_manuf_name;
e597cd09 701 pr_info("%s from %s with firmware %s\n",
74ee1a75
AM		 702 model_name, manuf_name, firmw_ver);
703 err = 0;
704 kfree(firmw_ver);
705free_manuf_name:
706 kfree(manuf_name);
707free_model_name:
708 kfree(model_name);
709free_id:
710 kfree(id);
711 return err;
712}
713
714/* set the default mode for DMA transfer */
715static int __devinit gdrom_init_dma_mode(void)
716{
717 ctrl_outb(0x13, GDROM_ERROR_REG);
718 ctrl_outb(0x22, GDROM_INTSEC_REG);
719 if (!gdrom_wait_clrbusy())
720 return -EBUSY;
721 ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
722 if (!gdrom_wait_busy_sleeps())
723 return -EBUSY;
724 /* Memory protection setting for GDROM DMA
725 * Bits 31 - 16 security: 0x8843
726 * Bits 15 and 7 reserved (0)
727 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
728 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
729 * (0x40 | 0x80) = start range at 0x0C000000
730 * (0x7F | 0x80) = end range at 0x0FFFFFFF */
731 ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
732 ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
733 return 0;
734}
735
736static void __devinit probe_gdrom_setupcd(void)
737{
738 gd.cd_info->ops = &gdrom_ops;
739 gd.cd_info->capacity = 1;
740 strcpy(gd.cd_info->name, GDROM_DEV_NAME);
741 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
742 CDC_SELECT_DISC;
743}
744
745static void __devinit probe_gdrom_setupdisk(void)
746{
747 gd.disk->major = gdrom_major;
748 gd.disk->first_minor = 1;
749 gd.disk->minors = 1;
750 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
751}
752
753static int __devinit probe_gdrom_setupqueue(void)
754{
e1defc4f 755 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
74ee1a75 756 /* using DMA so memory will need to be contiguous */
8a78362c 757 blk_queue_max_segments(gd.gdrom_rq, 1);
74ee1a75
AM		 758 /* set a large max size to get most from DMA */
759 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
760 gd.disk->queue = gd.gdrom_rq;
761 return gdrom_init_dma_mode();
762}
763
764/*
765 * register this as a block device and as compliant with the
766 * universal CD Rom driver interface
767 */
768static int __devinit probe_gdrom(struct platform_device *devptr)
769{
770 int err;
771 /* Start the device */
772 if (gdrom_execute_diagnostic() != 1) {
e597cd09 773 pr_warning("ATA Probe for GDROM failed\n");
74ee1a75
AM		 774 return -ENODEV;
775 }
776 /* Print out firmware ID */
777 if (gdrom_outputversion())
778 return -ENOMEM;
779 /* Register GDROM */
780 gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
781 if (gdrom_major <= 0)
782 return gdrom_major;
e597cd09 783 pr_info("Registered with major number %d\n",
74ee1a75
AM		 784 gdrom_major);
785 /* Specify basic properties of drive */
786 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
787 if (!gd.cd_info) {
788 err = -ENOMEM;
789 goto probe_fail_no_mem;
790 }
791 probe_gdrom_setupcd();
792 gd.disk = alloc_disk(1);
793 if (!gd.disk) {
794 err = -ENODEV;
795 goto probe_fail_no_disk;
796 }
797 probe_gdrom_setupdisk();
798 if (register_cdrom(gd.cd_info)) {
799 err = -ENODEV;
800 goto probe_fail_cdrom_register;
801 }
802 gd.disk->fops = &gdrom_bdops;
803 /* latch on to the interrupt */
804 err = gdrom_set_interrupt_handlers();
805 if (err)
806 goto probe_fail_cmdirq_register;
807 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
808 if (!gd.gdrom_rq)
809 goto probe_fail_requestq;
810
811 err = probe_gdrom_setupqueue();
812 if (err)
813 goto probe_fail_toc;
814
815 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
816 if (!gd.toc)
817 goto probe_fail_toc;
818 add_disk(gd.disk);
819 return 0;
820
821probe_fail_toc:
822 blk_cleanup_queue(gd.gdrom_rq);
823probe_fail_requestq:
824 free_irq(HW_EVENT_GDROM_DMA, &gd);
825 free_irq(HW_EVENT_GDROM_CMD, &gd);
826probe_fail_cmdirq_register:
827probe_fail_cdrom_register:
828 del_gendisk(gd.disk);
829probe_fail_no_disk:
830 kfree(gd.cd_info);
831 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
832 gdrom_major = 0;
833probe_fail_no_mem:
e597cd09 834 pr_warning("Probe failed - error is 0x%X\n", err);
74ee1a75
AM		 835 return err;
836}
837
838static int __devexit remove_gdrom(struct platform_device *devptr)
839{
840 flush_scheduled_work();
841 blk_cleanup_queue(gd.gdrom_rq);
842 free_irq(HW_EVENT_GDROM_CMD, &gd);
843 free_irq(HW_EVENT_GDROM_DMA, &gd);
844 del_gendisk(gd.disk);
845 if (gdrom_major)
846 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
0a0c4114
AM		 847 unregister_cdrom(gd.cd_info);
848
849 return 0;
74ee1a75
AM		 850}
851
852static struct platform_driver gdrom_driver = {
853 .probe = probe_gdrom,
854 .remove = __devexit_p(remove_gdrom),
855 .driver = {
856 .name = GDROM_DEV_NAME,
857 },
858};
859
860static int __init init_gdrom(void)
861{
862 int rc;
863 gd.toc = NULL;
864 rc = platform_driver_register(&gdrom_driver);
865 if (rc)
866 return rc;
867 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
868 if (IS_ERR(pd)) {
869 platform_driver_unregister(&gdrom_driver);
870 return PTR_ERR(pd);
871 }
872 return 0;
873}
874
875static void __exit exit_gdrom(void)
876{
877 platform_device_unregister(pd);
878 platform_driver_unregister(&gdrom_driver);
879 kfree(gd.toc);
880}
881
882module_init(init_gdrom);
883module_exit(exit_gdrom);
884MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
885MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
886MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree