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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
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>
37 #include <linux/mutex.h>
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>
45 #include <mach/dma.h>
46 #include <mach/sysasic.h>
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
84 static DEFINE_MUTEX(gdrom_mutex);
85 static 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
100 static struct platform_device *pd;
101 static int gdrom_major;
102 static DECLARE_WAIT_QUEUE_HEAD(command_queue);
103 static DECLARE_WAIT_QUEUE_HEAD(request_queue);
104
105 static DEFINE_SPINLOCK(gdrom_lock);
106 static void gdrom_readdisk_dma(struct work_struct *work);
107 static DECLARE_WORK(work, gdrom_readdisk_dma);
108 static LIST_HEAD(gdrom_deferred);
109
110 struct gdromtoc {
111 unsigned int entry[99];
112 unsigned int first, last;
113 unsigned int leadout;
114 };
115
116 static 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
127 struct 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
138 static int gdrom_getsense(short *bufstring);
139 static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
140 struct packet_command *command);
141 static int gdrom_hardreset(struct cdrom_device_info *cd_info);
142
gdrom_is_busy(void)143 static bool gdrom_is_busy(void)
144 {
145 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
146 }
147
gdrom_data_request(void)148 static bool gdrom_data_request(void)
149 {
150 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
151 }
152
gdrom_wait_clrbusy(void)153 static bool gdrom_wait_clrbusy(void)
154 {
155 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
156 while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&
157 (time_before(jiffies, timeout)))
158 cpu_relax();
159 return time_before(jiffies, timeout + 1);
160 }
161
gdrom_wait_busy_sleeps(void)162 static 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
gdrom_identifydevice(void * buf)173 static 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 __raw_writeb(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] = __raw_readw(GDROM_DATA_REG);
192 }
193
gdrom_spicommand(void * spi_string,int buflen)194 static 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 __raw_writeb(0x08, GDROM_ALTSTATUS_REG);
201 /* specify how many bytes we expect back */
202 __raw_writeb(buflen & 0xFF, GDROM_BCL_REG);
203 __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
204 /* other parameters */
205 __raw_writeb(0, GDROM_INTSEC_REG);
206 __raw_writeb(0, GDROM_SECNUM_REG);
207 __raw_writeb(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 __raw_writeb(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 }
221 outsw(GDROM_DATA_REG, cmd, 6);
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 */
gdrom_execute_diagnostic(void)231 static char gdrom_execute_diagnostic(void)
232 {
233 gdrom_hardreset(gd.cd_info);
234 if (!gdrom_wait_clrbusy())
235 return 0;
236 __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
237 if (!gdrom_wait_busy_sleeps())
238 return 0;
239 return __raw_readb(GDROM_ERROR_REG);
240 }
241
242 /*
243 * Prepare disk command
244 * byte 0 = 0x70
245 * byte 1 = 0x1f
246 */
gdrom_preparedisk_cmd(void)247 static 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 */
gdrom_readtoc_cmd(struct gdromtoc * toc,int session)278 static 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 }
305 insw(GDROM_DATA_REG, toc, tocsize/2);
306 if (gd.status & 0x01)
307 err = -EINVAL;
308
309 cleanup_readtoc:
310 gd.pending = 0;
311 cleanup_readtoc_final:
312 kfree(toc_command);
313 return err;
314 }
315
316 /* TOC helpers */
get_entry_lba(int track)317 static int get_entry_lba(int track)
318 {
319 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
320 }
321
get_entry_q_ctrl(int track)322 static int get_entry_q_ctrl(int track)
323 {
324 return (track & 0x000000f0) >> 4;
325 }
326
get_entry_track(int track)327 static int get_entry_track(int track)
328 {
329 return (track & 0x0000ff00) >> 8;
330 }
331
gdrom_get_last_session(struct cdrom_device_info * cd_info,struct cdrom_multisession * ms_info)332 static 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) {
346 pr_info("Could not get CD table of contents\n");
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))) {
363 pr_info("No data on the last session of the CD\n");
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
gdrom_open(struct cdrom_device_info * cd_info,int purpose)374 static 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 */
gdrom_release(struct cdrom_device_info * cd_info)381 static void gdrom_release(struct cdrom_device_info *cd_info)
382 {
383 }
384
gdrom_drivestatus(struct cdrom_device_info * cd_info,int ignore)385 static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
386 {
387 /* read the sense key */
388 char sense = __raw_readb(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
gdrom_check_events(struct cdrom_device_info * cd_info,unsigned int clearing,int ignore)398 static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
399 unsigned int clearing, int ignore)
400 {
401 /* check the sense key */
402 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
403 DISK_EVENT_MEDIA_CHANGE : 0;
404 }
405
406 /* reset the G1 bus */
gdrom_hardreset(struct cdrom_device_info * cd_info)407 static int gdrom_hardreset(struct cdrom_device_info *cd_info)
408 {
409 int count;
410 __raw_writel(0x1fffff, GDROM_RESET_REG);
411 for (count = 0xa0000000; count < 0xa0200000; count += 4)
412 __raw_readl(count);
413 return 0;
414 }
415
416 /* keep the function looking like the universal
417 * CD Rom specification - returning int */
gdrom_packetcommand(struct cdrom_device_info * cd_info,struct packet_command * command)418 static 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 */
gdrom_getsense(short * bufstring)431 static 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;
456 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
457 if (sense[1] & 40) {
458 pr_info("Drive not ready - command aborted\n");
459 goto cleanup_sense;
460 }
461 sense_key = sense[1] & 0x0F;
462 if (sense_key < ARRAY_SIZE(sense_texts))
463 pr_info("%s\n", sense_texts[sense_key].text);
464 else
465 pr_err("Unknown sense key: %d\n", sense_key);
466 if (bufstring) /* return addional sense data */
467 memcpy(bufstring, &sense[4], 2);
468 if (sense_key < 2)
469 err = 0;
470
471 cleanup_sense:
472 gd.pending = 0;
473 cleanup_sense_final:
474 kfree(sense_command);
475 return err;
476 }
477
gdrom_audio_ioctl(struct cdrom_device_info * cdi,unsigned int cmd,void * arg)478 static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
479 void *arg)
480 {
481 return -EINVAL;
482 }
483
484 static const struct cdrom_device_ops gdrom_ops = {
485 .open = gdrom_open,
486 .release = gdrom_release,
487 .drive_status = gdrom_drivestatus,
488 .check_events = gdrom_check_events,
489 .get_last_session = gdrom_get_last_session,
490 .reset = gdrom_hardreset,
491 .audio_ioctl = gdrom_audio_ioctl,
492 .generic_packet = cdrom_dummy_generic_packet,
493 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
494 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
495 };
496
gdrom_bdops_open(struct block_device * bdev,fmode_t mode)497 static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
498 {
499 int ret;
500
501 check_disk_change(bdev);
502
503 mutex_lock(&gdrom_mutex);
504 ret = cdrom_open(gd.cd_info, bdev, mode);
505 mutex_unlock(&gdrom_mutex);
506 return ret;
507 }
508
gdrom_bdops_release(struct gendisk * disk,fmode_t mode)509 static void gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
510 {
511 mutex_lock(&gdrom_mutex);
512 cdrom_release(gd.cd_info, mode);
513 mutex_unlock(&gdrom_mutex);
514 }
515
gdrom_bdops_check_events(struct gendisk * disk,unsigned int clearing)516 static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
517 unsigned int clearing)
518 {
519 return cdrom_check_events(gd.cd_info, clearing);
520 }
521
gdrom_bdops_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)522 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
523 unsigned cmd, unsigned long arg)
524 {
525 int ret;
526
527 mutex_lock(&gdrom_mutex);
528 ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
529 mutex_unlock(&gdrom_mutex);
530
531 return ret;
532 }
533
534 static const struct block_device_operations gdrom_bdops = {
535 .owner = THIS_MODULE,
536 .open = gdrom_bdops_open,
537 .release = gdrom_bdops_release,
538 .check_events = gdrom_bdops_check_events,
539 .ioctl = gdrom_bdops_ioctl,
540 };
541
gdrom_command_interrupt(int irq,void * dev_id)542 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
543 {
544 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
545 if (gd.pending != 1)
546 return IRQ_HANDLED;
547 gd.pending = 0;
548 wake_up_interruptible(&command_queue);
549 return IRQ_HANDLED;
550 }
551
gdrom_dma_interrupt(int irq,void * dev_id)552 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
553 {
554 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
555 if (gd.transfer != 1)
556 return IRQ_HANDLED;
557 gd.transfer = 0;
558 wake_up_interruptible(&request_queue);
559 return IRQ_HANDLED;
560 }
561
gdrom_set_interrupt_handlers(void)562 static int gdrom_set_interrupt_handlers(void)
563 {
564 int err;
565
566 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
567 0, "gdrom_command", &gd);
568 if (err)
569 return err;
570 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
571 0, "gdrom_dma", &gd);
572 if (err)
573 free_irq(HW_EVENT_GDROM_CMD, &gd);
574 return err;
575 }
576
577 /* Implement DMA read using SPI command
578 * 0 -> 0x30
579 * 1 -> mode
580 * 2 -> block >> 16
581 * 3 -> block >> 8
582 * 4 -> block
583 * 8 -> sectors >> 16
584 * 9 -> sectors >> 8
585 * 10 -> sectors
586 */
gdrom_readdisk_dma(struct work_struct * work)587 static void gdrom_readdisk_dma(struct work_struct *work)
588 {
589 int block, block_cnt;
590 blk_status_t err;
591 struct packet_command *read_command;
592 struct list_head *elem, *next;
593 struct request *req;
594 unsigned long timeout;
595
596 if (list_empty(&gdrom_deferred))
597 return;
598 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
599 if (!read_command)
600 return; /* get more memory later? */
601 read_command->cmd[0] = 0x30;
602 read_command->cmd[1] = 0x20;
603 spin_lock(&gdrom_lock);
604 list_for_each_safe(elem, next, &gdrom_deferred) {
605 req = list_entry(elem, struct request, queuelist);
606 spin_unlock(&gdrom_lock);
607 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
608 block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
609 __raw_writel(virt_to_phys(bio_data(req->bio)), GDROM_DMA_STARTADDR_REG);
610 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
611 __raw_writel(1, GDROM_DMA_DIRECTION_REG);
612 __raw_writel(1, GDROM_DMA_ENABLE_REG);
613 read_command->cmd[2] = (block >> 16) & 0xFF;
614 read_command->cmd[3] = (block >> 8) & 0xFF;
615 read_command->cmd[4] = block & 0xFF;
616 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
617 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
618 read_command->cmd[10] = block_cnt & 0xFF;
619 /* set for DMA */
620 __raw_writeb(1, GDROM_ERROR_REG);
621 /* other registers */
622 __raw_writeb(0, GDROM_SECNUM_REG);
623 __raw_writeb(0, GDROM_BCL_REG);
624 __raw_writeb(0, GDROM_BCH_REG);
625 __raw_writeb(0, GDROM_DSEL_REG);
626 __raw_writeb(0, GDROM_INTSEC_REG);
627 /* Wait for registers to reset after any previous activity */
628 timeout = jiffies + HZ / 2;
629 while (gdrom_is_busy() && time_before(jiffies, timeout))
630 cpu_relax();
631 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
632 timeout = jiffies + HZ / 2;
633 /* Wait for packet command to finish */
634 while (gdrom_is_busy() && time_before(jiffies, timeout))
635 cpu_relax();
636 gd.pending = 1;
637 gd.transfer = 1;
638 outsw(GDROM_DATA_REG, &read_command->cmd, 6);
639 timeout = jiffies + HZ / 2;
640 /* Wait for any pending DMA to finish */
641 while (__raw_readb(GDROM_DMA_STATUS_REG) &&
642 time_before(jiffies, timeout))
643 cpu_relax();
644 /* start transfer */
645 __raw_writeb(1, GDROM_DMA_STATUS_REG);
646 wait_event_interruptible_timeout(request_queue,
647 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
648 err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
649 gd.transfer = 0;
650 gd.pending = 0;
651 /* now seek to take the request spinlock
652 * before handling ending the request */
653 spin_lock(&gdrom_lock);
654 list_del_init(&req->queuelist);
655 __blk_end_request_all(req, err);
656 }
657 spin_unlock(&gdrom_lock);
658 kfree(read_command);
659 }
660
gdrom_request(struct request_queue * rq)661 static void gdrom_request(struct request_queue *rq)
662 {
663 struct request *req;
664
665 while ((req = blk_fetch_request(rq)) != NULL) {
666 switch (req_op(req)) {
667 case REQ_OP_READ:
668 /*
669 * Add to list of deferred work and then schedule
670 * workqueue.
671 */
672 list_add_tail(&req->queuelist, &gdrom_deferred);
673 schedule_work(&work);
674 break;
675 case REQ_OP_WRITE:
676 pr_notice("Read only device - write request ignored\n");
677 __blk_end_request_all(req, BLK_STS_IOERR);
678 break;
679 default:
680 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
681 __blk_end_request_all(req, BLK_STS_IOERR);
682 break;
683 }
684 }
685 }
686
687 /* Print string identifying GD ROM device */
gdrom_outputversion(void)688 static int gdrom_outputversion(void)
689 {
690 struct gdrom_id *id;
691 char *model_name, *manuf_name, *firmw_ver;
692 int err = -ENOMEM;
693
694 /* query device ID */
695 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
696 if (!id)
697 return err;
698 gdrom_identifydevice(id);
699 model_name = kstrndup(id->modname, 16, GFP_KERNEL);
700 if (!model_name)
701 goto free_id;
702 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
703 if (!manuf_name)
704 goto free_model_name;
705 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
706 if (!firmw_ver)
707 goto free_manuf_name;
708 pr_info("%s from %s with firmware %s\n",
709 model_name, manuf_name, firmw_ver);
710 err = 0;
711 kfree(firmw_ver);
712 free_manuf_name:
713 kfree(manuf_name);
714 free_model_name:
715 kfree(model_name);
716 free_id:
717 kfree(id);
718 return err;
719 }
720
721 /* set the default mode for DMA transfer */
gdrom_init_dma_mode(void)722 static int gdrom_init_dma_mode(void)
723 {
724 __raw_writeb(0x13, GDROM_ERROR_REG);
725 __raw_writeb(0x22, GDROM_INTSEC_REG);
726 if (!gdrom_wait_clrbusy())
727 return -EBUSY;
728 __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG);
729 if (!gdrom_wait_busy_sleeps())
730 return -EBUSY;
731 /* Memory protection setting for GDROM DMA
732 * Bits 31 - 16 security: 0x8843
733 * Bits 15 and 7 reserved (0)
734 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
735 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
736 * (0x40 | 0x80) = start range at 0x0C000000
737 * (0x7F | 0x80) = end range at 0x0FFFFFFF */
738 __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
739 __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
740 return 0;
741 }
742
probe_gdrom_setupcd(void)743 static void probe_gdrom_setupcd(void)
744 {
745 gd.cd_info->ops = &gdrom_ops;
746 gd.cd_info->capacity = 1;
747 strcpy(gd.cd_info->name, GDROM_DEV_NAME);
748 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
749 CDC_SELECT_DISC;
750 }
751
probe_gdrom_setupdisk(void)752 static void probe_gdrom_setupdisk(void)
753 {
754 gd.disk->major = gdrom_major;
755 gd.disk->first_minor = 1;
756 gd.disk->minors = 1;
757 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
758 }
759
probe_gdrom_setupqueue(void)760 static int probe_gdrom_setupqueue(void)
761 {
762 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
763 /* using DMA so memory will need to be contiguous */
764 blk_queue_max_segments(gd.gdrom_rq, 1);
765 /* set a large max size to get most from DMA */
766 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
767 gd.disk->queue = gd.gdrom_rq;
768 return gdrom_init_dma_mode();
769 }
770
771 /*
772 * register this as a block device and as compliant with the
773 * universal CD Rom driver interface
774 */
probe_gdrom(struct platform_device * devptr)775 static int probe_gdrom(struct platform_device *devptr)
776 {
777 int err;
778
779 /*
780 * Ensure our "one" device is initialized properly in case of previous
781 * usages of it
782 */
783 memset(&gd, 0, sizeof(gd));
784
785 /* Start the device */
786 if (gdrom_execute_diagnostic() != 1) {
787 pr_warning("ATA Probe for GDROM failed\n");
788 return -ENODEV;
789 }
790 /* Print out firmware ID */
791 if (gdrom_outputversion())
792 return -ENOMEM;
793 /* Register GDROM */
794 gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
795 if (gdrom_major <= 0)
796 return gdrom_major;
797 pr_info("Registered with major number %d\n",
798 gdrom_major);
799 /* Specify basic properties of drive */
800 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
801 if (!gd.cd_info) {
802 err = -ENOMEM;
803 goto probe_fail_no_mem;
804 }
805 probe_gdrom_setupcd();
806 gd.disk = alloc_disk(1);
807 if (!gd.disk) {
808 err = -ENODEV;
809 goto probe_fail_no_disk;
810 }
811 probe_gdrom_setupdisk();
812 if (register_cdrom(gd.cd_info)) {
813 err = -ENODEV;
814 goto probe_fail_cdrom_register;
815 }
816 gd.disk->fops = &gdrom_bdops;
817 /* latch on to the interrupt */
818 err = gdrom_set_interrupt_handlers();
819 if (err)
820 goto probe_fail_cmdirq_register;
821 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
822 if (!gd.gdrom_rq) {
823 err = -ENOMEM;
824 goto probe_fail_requestq;
825 }
826 blk_queue_bounce_limit(gd.gdrom_rq, BLK_BOUNCE_HIGH);
827
828 err = probe_gdrom_setupqueue();
829 if (err)
830 goto probe_fail_toc;
831
832 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
833 if (!gd.toc) {
834 err = -ENOMEM;
835 goto probe_fail_toc;
836 }
837 add_disk(gd.disk);
838 return 0;
839
840 probe_fail_toc:
841 blk_cleanup_queue(gd.gdrom_rq);
842 probe_fail_requestq:
843 free_irq(HW_EVENT_GDROM_DMA, &gd);
844 free_irq(HW_EVENT_GDROM_CMD, &gd);
845 probe_fail_cmdirq_register:
846 probe_fail_cdrom_register:
847 del_gendisk(gd.disk);
848 probe_fail_no_disk:
849 kfree(gd.cd_info);
850 probe_fail_no_mem:
851 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
852 gdrom_major = 0;
853 pr_warning("Probe failed - error is 0x%X\n", err);
854 return err;
855 }
856
remove_gdrom(struct platform_device * devptr)857 static int remove_gdrom(struct platform_device *devptr)
858 {
859 flush_work(&work);
860 blk_cleanup_queue(gd.gdrom_rq);
861 free_irq(HW_EVENT_GDROM_CMD, &gd);
862 free_irq(HW_EVENT_GDROM_DMA, &gd);
863 del_gendisk(gd.disk);
864 if (gdrom_major)
865 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
866 unregister_cdrom(gd.cd_info);
867 kfree(gd.cd_info);
868 kfree(gd.toc);
869
870 return 0;
871 }
872
873 static struct platform_driver gdrom_driver = {
874 .probe = probe_gdrom,
875 .remove = remove_gdrom,
876 .driver = {
877 .name = GDROM_DEV_NAME,
878 },
879 };
880
init_gdrom(void)881 static int __init init_gdrom(void)
882 {
883 int rc;
884
885 rc = platform_driver_register(&gdrom_driver);
886 if (rc)
887 return rc;
888 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
889 if (IS_ERR(pd)) {
890 platform_driver_unregister(&gdrom_driver);
891 return PTR_ERR(pd);
892 }
893 return 0;
894 }
895
exit_gdrom(void)896 static void __exit exit_gdrom(void)
897 {
898 platform_device_unregister(pd);
899 platform_driver_unregister(&gdrom_driver);
900 }
901
902 module_init(init_gdrom);
903 module_exit(exit_gdrom);
904 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
905 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
906 MODULE_LICENSE("GPL");
907