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Merge remote-tracking branch 'asoc/topic/wm8985' into asoc-next
[GitHub/mt8127/android_kernel_alcatel_ttab.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
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{
9eb79bb3 145 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
74ee1a75
AM		 146}
147
148static bool gdrom_data_request(void)
149{
9eb79bb3 150 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
74ee1a75
AM		 151}
152
153static bool gdrom_wait_clrbusy(void)
154{
155 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
9eb79bb3 156 while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&
74ee1a75
AM		 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 }
9eb79bb3 184 __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 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++)
9eb79bb3 191 data[c] = __raw_readw(GDROM_DATA_REG);
74ee1a75
AM		 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 */
9eb79bb3 200 __raw_writeb(0x08, GDROM_ALTSTATUS_REG);
74ee1a75 201 /* specify how many bytes we expect back */
9eb79bb3
PM		 202 __raw_writeb(buflen & 0xFF, GDROM_BCL_REG);
203 __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
74ee1a75 204 /* other parameters */
9eb79bb3
PM		 205 __raw_writeb(0, GDROM_INTSEC_REG);
206 __raw_writeb(0, GDROM_SECNUM_REG);
207 __raw_writeb(0, GDROM_ERROR_REG);
74ee1a75
AM		 208 /* Wait until we can go */
209 if (!gdrom_wait_clrbusy()) {
210 gdrom_getsense(NULL);
211 return;
212 }
213 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
9eb79bb3 214 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 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;
9eb79bb3 236 __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 237 if (!gdrom_wait_busy_sleeps())
238 return 0;
9eb79bb3 239 return __raw_readb(GDROM_ERROR_REG);
74ee1a75
AM		 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 */
9eb79bb3 388 char sense = __raw_readb(GDROM_ERROR_REG);
74ee1a75
AM		 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
1c27030b
TH		 398static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
399 unsigned int clearing, int ignore)
74ee1a75
AM		 400{
401 /* check the sense key */
1c27030b
TH		 402 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
403 DISK_EVENT_MEDIA_CHANGE : 0;
74ee1a75
AM		 404}
405
406/* reset the G1 bus */
407static int gdrom_hardreset(struct cdrom_device_info *cd_info)
408{
409 int count;
9eb79bb3 410 __raw_writel(0x1fffff, GDROM_RESET_REG);
74ee1a75 411 for (count = 0xa0000000; count < 0xa0200000; count += 4)
9eb79bb3 412 __raw_readl(count);
74ee1a75
AM		 413 return 0;
414}
415
416/* keep the function looking like the universal
417 * CD Rom specification - returning int */
418static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
419 struct packet_command *command)
420{
421 gdrom_spicommand(&command->cmd, command->buflen);
422 return 0;
423}
424
425/* Get Sense SPI command
426 * From Marcus Comstedt
427 * cmd = 0x13
428 * cmd + 4 = length of returned buffer
429 * Returns 5 16 bit words
430 */
431static int gdrom_getsense(short *bufstring)
432{
433 struct packet_command *sense_command;
434 short sense[5];
435 int sense_key;
436 int err = -EIO;
437
438 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
439 if (!sense_command)
440 return -ENOMEM;
441 sense_command->cmd[0] = 0x13;
442 sense_command->cmd[4] = 10;
443 sense_command->buflen = 10;
444 /* even if something is pending try to get
445 * the sense key if possible */
446 if (gd.pending && !gdrom_wait_clrbusy()) {
447 err = -EBUSY;
448 goto cleanup_sense_final;
449 }
450 gd.pending = 1;
451 gdrom_packetcommand(gd.cd_info, sense_command);
452 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
453 GDROM_DEFAULT_TIMEOUT);
454 if (gd.pending)
455 goto cleanup_sense;
54d5102f 456 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
74ee1a75 457 if (sense[1] & 40) {
e597cd09 458 pr_info("Drive not ready - command aborted\n");
74ee1a75
AM		 459 goto cleanup_sense;
460 }
461 sense_key = sense[1] & 0x0F;
462 if (sense_key < ARRAY_SIZE(sense_texts))
e597cd09 463 pr_info("%s\n", sense_texts[sense_key].text);
74ee1a75 464 else
e597cd09 465 pr_err("Unknown sense key: %d\n", sense_key);
74ee1a75
AM		 466 if (bufstring) /* return addional sense data */
467 memcpy(bufstring, &sense[4], 2);
468 if (sense_key < 2)
469 err = 0;
470
471cleanup_sense:
472 gd.pending = 0;
473cleanup_sense_final:
474 kfree(sense_command);
475 return err;
476}
477
d15cad5d
BP		 478static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
479 void *arg)
480{
481 return -EINVAL;
482}
483
74ee1a75
AM		 484static struct cdrom_device_ops gdrom_ops = {
485 .open = gdrom_open,
486 .release = gdrom_release,
487 .drive_status = gdrom_drivestatus,
1c27030b 488 .check_events = gdrom_check_events,
74ee1a75
AM		 489 .get_last_session = gdrom_get_last_session,
490 .reset = gdrom_hardreset,
d15cad5d 491 .audio_ioctl = gdrom_audio_ioctl,
74ee1a75
AM		 492 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
493 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
494 .n_minors = 1,
495};
496
8389feb4 497static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
74ee1a75 498{
6e9624b8 499 int ret;
2a48fc0a 500 mutex_lock(&gdrom_mutex);
6e9624b8 501 ret = cdrom_open(gd.cd_info, bdev, mode);
2a48fc0a 502 mutex_unlock(&gdrom_mutex);
6e9624b8 503 return ret;
74ee1a75
AM		 504}
505
545727f3 506static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
74ee1a75 507{
2a48fc0a 508 mutex_lock(&gdrom_mutex);
545727f3 509 cdrom_release(gd.cd_info, mode);
2a48fc0a 510 mutex_unlock(&gdrom_mutex);
545727f3 511 return 0;
74ee1a75
AM		 512}
513
1c27030b
TH		 514static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
515 unsigned int clearing)
74ee1a75 516{
1c27030b 517 return cdrom_check_events(gd.cd_info, clearing);
74ee1a75
AM		 518}
519
8389feb4 520static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
74ee1a75
AM		 521 unsigned cmd, unsigned long arg)
522{
8a6cfeb6
AB		 523 int ret;
524
2a48fc0a 525 mutex_lock(&gdrom_mutex);
8a6cfeb6 526 ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
2a48fc0a 527 mutex_unlock(&gdrom_mutex);
8a6cfeb6
AB		 528
529 return ret;
74ee1a75
AM		 530}
531
83d5cde4 532static const struct block_device_operations gdrom_bdops = {
74ee1a75 533 .owner = THIS_MODULE,
8389feb4
AV		 534 .open = gdrom_bdops_open,
535 .release = gdrom_bdops_release,
1c27030b 536 .check_events = gdrom_bdops_check_events,
8a6cfeb6 537 .ioctl = gdrom_bdops_ioctl,
74ee1a75
AM		 538};
539
540static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
541{
9eb79bb3 542 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 543 if (gd.pending != 1)
544 return IRQ_HANDLED;
545 gd.pending = 0;
546 wake_up_interruptible(&command_queue);
547 return IRQ_HANDLED;
548}
549
550static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
551{
9eb79bb3 552 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 553 if (gd.transfer != 1)
554 return IRQ_HANDLED;
555 gd.transfer = 0;
556 wake_up_interruptible(&request_queue);
557 return IRQ_HANDLED;
558}
559
0fe763c5 560static int gdrom_set_interrupt_handlers(void)
74ee1a75
AM		 561{
562 int err;
563
564 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
565 IRQF_DISABLED, "gdrom_command", &gd);
566 if (err)
567 return err;
568 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
569 IRQF_DISABLED, "gdrom_dma", &gd);
570 if (err)
571 free_irq(HW_EVENT_GDROM_CMD, &gd);
572 return err;
573}
574
575/* Implement DMA read using SPI command
576 * 0 -> 0x30
577 * 1 -> mode
578 * 2 -> block >> 16
579 * 3 -> block >> 8
580 * 4 -> block
581 * 8 -> sectors >> 16
582 * 9 -> sectors >> 8
583 * 10 -> sectors
584 */
585static void gdrom_readdisk_dma(struct work_struct *work)
586{
587 int err, block, block_cnt;
588 struct packet_command *read_command;
589 struct list_head *elem, *next;
590 struct request *req;
591 unsigned long timeout;
592
593 if (list_empty(&gdrom_deferred))
594 return;
595 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
596 if (!read_command)
597 return; /* get more memory later? */
598 read_command->cmd[0] = 0x30;
599 read_command->cmd[1] = 0x20;
600 spin_lock(&gdrom_lock);
601 list_for_each_safe(elem, next, &gdrom_deferred) {
602 req = list_entry(elem, struct request, queuelist);
603 spin_unlock(&gdrom_lock);
83096ebf
TH		 604 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
605 block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
9eb79bb3
PM		 606 __raw_writel(virt_to_phys(req->buffer), GDROM_DMA_STARTADDR_REG);
607 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
608 __raw_writel(1, GDROM_DMA_DIRECTION_REG);
609 __raw_writel(1, GDROM_DMA_ENABLE_REG);
74ee1a75
AM		 610 read_command->cmd[2] = (block >> 16) & 0xFF;
611 read_command->cmd[3] = (block >> 8) & 0xFF;
612 read_command->cmd[4] = block & 0xFF;
613 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
614 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
615 read_command->cmd[10] = block_cnt & 0xFF;
616 /* set for DMA */
9eb79bb3 617 __raw_writeb(1, GDROM_ERROR_REG);
74ee1a75 618 /* other registers */
9eb79bb3
PM		 619 __raw_writeb(0, GDROM_SECNUM_REG);
620 __raw_writeb(0, GDROM_BCL_REG);
621 __raw_writeb(0, GDROM_BCH_REG);
622 __raw_writeb(0, GDROM_DSEL_REG);
623 __raw_writeb(0, GDROM_INTSEC_REG);
74ee1a75
AM		 624 /* Wait for registers to reset after any previous activity */
625 timeout = jiffies + HZ / 2;
626 while (gdrom_is_busy() && time_before(jiffies, timeout))
627 cpu_relax();
9eb79bb3 628 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 629 timeout = jiffies + HZ / 2;
630 /* Wait for packet command to finish */
631 while (gdrom_is_busy() && time_before(jiffies, timeout))
632 cpu_relax();
633 gd.pending = 1;
634 gd.transfer = 1;
54d5102f 635 outsw(GDROM_DATA_REG, &read_command->cmd, 6);
74ee1a75
AM		 636 timeout = jiffies + HZ / 2;
637 /* Wait for any pending DMA to finish */
9eb79bb3 638 while (__raw_readb(GDROM_DMA_STATUS_REG) &&
74ee1a75
AM		 639 time_before(jiffies, timeout))
640 cpu_relax();
641 /* start transfer */
9eb79bb3 642 __raw_writeb(1, GDROM_DMA_STATUS_REG);
74ee1a75
AM		 643 wait_event_interruptible_timeout(request_queue,
644 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
7afb3a6e 645 err = gd.transfer ? -EIO : 0;
74ee1a75
AM		 646 gd.transfer = 0;
647 gd.pending = 0;
648 /* now seek to take the request spinlock
649 * before handling ending the request */
650 spin_lock(&gdrom_lock);
651 list_del_init(&req->queuelist);
40cbbb78 652 __blk_end_request_all(req, err);
74ee1a75
AM		 653 }
654 spin_unlock(&gdrom_lock);
655 kfree(read_command);
656}
657
74ee1a75
AM		 658static void gdrom_request(struct request_queue *rq)
659{
660 struct request *req;
661
9934c8c0 662 while ((req = blk_fetch_request(rq)) != NULL) {
33659ebb 663 if (req->cmd_type != REQ_TYPE_FS) {
e597cd09 664 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
23430468
TH		 665 __blk_end_request_all(req, -EIO);
666 continue;
74ee1a75
AM		 667 }
668 if (rq_data_dir(req) != READ) {
e597cd09 669 pr_notice("Read only device - write request ignored\n");
23430468
TH		 670 __blk_end_request_all(req, -EIO);
671 continue;
74ee1a75 672 }
23430468
TH		 673
674 /*
675 * Add to list of deferred work and then schedule
676 * workqueue.
677 */
678 list_add_tail(&req->queuelist, &gdrom_deferred);
679 schedule_work(&work);
74ee1a75
AM		 680 }
681}
682
683/* Print string identifying GD ROM device */
0fe763c5 684static int gdrom_outputversion(void)
74ee1a75
AM		 685{
686 struct gdrom_id *id;
687 char *model_name, *manuf_name, *firmw_ver;
688 int err = -ENOMEM;
689
690 /* query device ID */
691 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
692 if (!id)
693 return err;
694 gdrom_identifydevice(id);
695 model_name = kstrndup(id->modname, 16, GFP_KERNEL);
696 if (!model_name)
697 goto free_id;
698 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
699 if (!manuf_name)
700 goto free_model_name;
701 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
702 if (!firmw_ver)
703 goto free_manuf_name;
e597cd09 704 pr_info("%s from %s with firmware %s\n",
74ee1a75
AM		 705 model_name, manuf_name, firmw_ver);
706 err = 0;
707 kfree(firmw_ver);
708free_manuf_name:
709 kfree(manuf_name);
710free_model_name:
711 kfree(model_name);
712free_id:
713 kfree(id);
714 return err;
715}
716
717/* set the default mode for DMA transfer */
0fe763c5 718static int gdrom_init_dma_mode(void)
74ee1a75 719{
9eb79bb3
PM		 720 __raw_writeb(0x13, GDROM_ERROR_REG);
721 __raw_writeb(0x22, GDROM_INTSEC_REG);
74ee1a75
AM		 722 if (!gdrom_wait_clrbusy())
723 return -EBUSY;
9eb79bb3 724 __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 725 if (!gdrom_wait_busy_sleeps())
726 return -EBUSY;
727 /* Memory protection setting for GDROM DMA
728 * Bits 31 - 16 security: 0x8843
729 * Bits 15 and 7 reserved (0)
730 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
731 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
732 * (0x40 | 0x80) = start range at 0x0C000000
733 * (0x7F | 0x80) = end range at 0x0FFFFFFF */
9eb79bb3
PM		 734 __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
735 __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
74ee1a75
AM		 736 return 0;
737}
738
0fe763c5 739static void probe_gdrom_setupcd(void)
74ee1a75
AM		 740{
741 gd.cd_info->ops = &gdrom_ops;
742 gd.cd_info->capacity = 1;
743 strcpy(gd.cd_info->name, GDROM_DEV_NAME);
744 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
745 CDC_SELECT_DISC;
746}
747
0fe763c5 748static void probe_gdrom_setupdisk(void)
74ee1a75
AM		 749{
750 gd.disk->major = gdrom_major;
751 gd.disk->first_minor = 1;
752 gd.disk->minors = 1;
753 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
754}
755
0fe763c5 756static int probe_gdrom_setupqueue(void)
74ee1a75 757{
e1defc4f 758 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
74ee1a75 759 /* using DMA so memory will need to be contiguous */
8a78362c 760 blk_queue_max_segments(gd.gdrom_rq, 1);
74ee1a75
AM		 761 /* set a large max size to get most from DMA */
762 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
763 gd.disk->queue = gd.gdrom_rq;
764 return gdrom_init_dma_mode();
765}
766
767/*
768 * register this as a block device and as compliant with the
769 * universal CD Rom driver interface
770 */
0fe763c5 771static int probe_gdrom(struct platform_device *devptr)
74ee1a75
AM		 772{
773 int err;
774 /* Start the device */
775 if (gdrom_execute_diagnostic() != 1) {
e597cd09 776 pr_warning("ATA Probe for GDROM failed\n");
74ee1a75
AM		 777 return -ENODEV;
778 }
779 /* Print out firmware ID */
780 if (gdrom_outputversion())
781 return -ENOMEM;
782 /* Register GDROM */
783 gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
784 if (gdrom_major <= 0)
785 return gdrom_major;
e597cd09 786 pr_info("Registered with major number %d\n",
74ee1a75
AM		 787 gdrom_major);
788 /* Specify basic properties of drive */
789 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
790 if (!gd.cd_info) {
791 err = -ENOMEM;
792 goto probe_fail_no_mem;
793 }
794 probe_gdrom_setupcd();
795 gd.disk = alloc_disk(1);
796 if (!gd.disk) {
797 err = -ENODEV;
798 goto probe_fail_no_disk;
799 }
800 probe_gdrom_setupdisk();
801 if (register_cdrom(gd.cd_info)) {
802 err = -ENODEV;
803 goto probe_fail_cdrom_register;
804 }
805 gd.disk->fops = &gdrom_bdops;
806 /* latch on to the interrupt */
807 err = gdrom_set_interrupt_handlers();
808 if (err)
809 goto probe_fail_cmdirq_register;
810 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
811 if (!gd.gdrom_rq)
812 goto probe_fail_requestq;
813
814 err = probe_gdrom_setupqueue();
815 if (err)
816 goto probe_fail_toc;
817
818 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
819 if (!gd.toc)
820 goto probe_fail_toc;
821 add_disk(gd.disk);
822 return 0;
823
824probe_fail_toc:
825 blk_cleanup_queue(gd.gdrom_rq);
826probe_fail_requestq:
827 free_irq(HW_EVENT_GDROM_DMA, &gd);
828 free_irq(HW_EVENT_GDROM_CMD, &gd);
829probe_fail_cmdirq_register:
830probe_fail_cdrom_register:
831 del_gendisk(gd.disk);
832probe_fail_no_disk:
833 kfree(gd.cd_info);
834 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
835 gdrom_major = 0;
836probe_fail_no_mem:
e597cd09 837 pr_warning("Probe failed - error is 0x%X\n", err);
74ee1a75
AM		 838 return err;
839}
840
0fe763c5 841static int remove_gdrom(struct platform_device *devptr)
74ee1a75 842{
43829731 843 flush_work(&work);
74ee1a75
AM		 844 blk_cleanup_queue(gd.gdrom_rq);
845 free_irq(HW_EVENT_GDROM_CMD, &gd);
846 free_irq(HW_EVENT_GDROM_DMA, &gd);
847 del_gendisk(gd.disk);
848 if (gdrom_major)
849 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
0a0c4114
AM		 850 unregister_cdrom(gd.cd_info);
851
852 return 0;
74ee1a75
AM		 853}
854
855static struct platform_driver gdrom_driver = {
856 .probe = probe_gdrom,
0fe763c5 857 .remove = remove_gdrom,
74ee1a75
AM		 858 .driver = {
859 .name = GDROM_DEV_NAME,
860 },
861};
862
863static int __init init_gdrom(void)
864{
865 int rc;
866 gd.toc = NULL;
867 rc = platform_driver_register(&gdrom_driver);
868 if (rc)
869 return rc;
870 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
871 if (IS_ERR(pd)) {
872 platform_driver_unregister(&gdrom_driver);
873 return PTR_ERR(pd);
874 }
875 return 0;
876}
877
878static void __exit exit_gdrom(void)
879{
880 platform_device_unregister(pd);
881 platform_driver_unregister(&gdrom_driver);
882 kfree(gd.toc);
883}
884
885module_init(init_gdrom);
886module_exit(exit_gdrom);
887MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
888MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
889MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)