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Merge tag 'meminit-v5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
[linux-block.git] / drivers / cdrom / gdrom.c
CommitLineData
16216333 1// SPDX-License-Identifier: GPL-2.0-or-later
74ee1a75
AM		 2/* GD ROM driver for the SEGA Dreamcast
3 * copyright Adrian McMenamin, 2007
4 * With thanks to Marcus Comstedt and Nathan Keynes
5 * for work in reversing PIO and DMA
74ee1a75
AM		 6 */
7
e597cd09
JP		 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
74ee1a75
AM		 10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/fs.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/slab.h>
16#include <linux/dma-mapping.h>
17#include <linux/cdrom.h>
18#include <linux/genhd.h>
19#include <linux/bio.h>
ad5fc6bb 20#include <linux/blk-mq.h>
74ee1a75
AM		 21#include <linux/interrupt.h>
22#include <linux/device.h>
2a48fc0a 23#include <linux/mutex.h>
74ee1a75 24#include <linux/wait.h>
74ee1a75
AM		 25#include <linux/platform_device.h>
26#include <scsi/scsi.h>
27#include <asm/io.h>
28#include <asm/dma.h>
29#include <asm/delay.h>
0764bff4
PM		 30#include <mach/dma.h>
31#include <mach/sysasic.h>
74ee1a75
AM		 32
33#define GDROM_DEV_NAME "gdrom"
34#define GD_SESSION_OFFSET 150
35
36/* GD Rom commands */
37#define GDROM_COM_SOFTRESET 0x08
38#define GDROM_COM_EXECDIAG 0x90
39#define GDROM_COM_PACKET 0xA0
40#define GDROM_COM_IDDEV 0xA1
41
42/* GD Rom registers */
43#define GDROM_BASE_REG 0xA05F7000
44#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
45#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
46#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
47#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
48#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
49#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
50#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
51#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
52#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
53#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
54
55#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
56#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
57#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
58#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
59#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
60#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
61#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
62
63#define GDROM_HARD_SECTOR 2048
64#define BLOCK_LAYER_SECTOR 512
65#define GD_TO_BLK 4
66
67#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
68
2a48fc0a 69static DEFINE_MUTEX(gdrom_mutex);
74ee1a75
AM		 70static const struct {
71 int sense_key;
72 const char * const text;
73} sense_texts[] = {
74 {NO_SENSE, "OK"},
75 {RECOVERED_ERROR, "Recovered from error"},
76 {NOT_READY, "Device not ready"},
77 {MEDIUM_ERROR, "Disk not ready"},
78 {HARDWARE_ERROR, "Hardware error"},
79 {ILLEGAL_REQUEST, "Command has failed"},
80 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
81 {DATA_PROTECT, "Data protection error"},
82 {ABORTED_COMMAND, "Command aborted"},
83};
84
85static struct platform_device *pd;
86static int gdrom_major;
87static DECLARE_WAIT_QUEUE_HEAD(command_queue);
88static DECLARE_WAIT_QUEUE_HEAD(request_queue);
89
74ee1a75
AM		 90struct gdromtoc {
91 unsigned int entry[99];
92 unsigned int first, last;
93 unsigned int leadout;
94};
95
96static struct gdrom_unit {
97 struct gendisk *disk;
98 struct cdrom_device_info *cd_info;
99 int status;
100 int pending;
101 int transfer;
102 char disk_type;
103 struct gdromtoc *toc;
104 struct request_queue *gdrom_rq;
ad5fc6bb 105 struct blk_mq_tag_set tag_set;
74ee1a75
AM		 106} gd;
107
108struct gdrom_id {
109 char mid;
110 char modid;
111 char verid;
112 char padA[13];
113 char mname[16];
114 char modname[16];
115 char firmver[16];
116 char padB[16];
117};
118
119static int gdrom_getsense(short *bufstring);
120static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
121 struct packet_command *command);
122static int gdrom_hardreset(struct cdrom_device_info *cd_info);
123
124static bool gdrom_is_busy(void)
125{
9eb79bb3 126 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
74ee1a75
AM		 127}
128
129static bool gdrom_data_request(void)
130{
9eb79bb3 131 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
74ee1a75
AM		 132}
133
134static bool gdrom_wait_clrbusy(void)
135{
136 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
9eb79bb3 137 while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&
74ee1a75
AM		 138 (time_before(jiffies, timeout)))
139 cpu_relax();
140 return time_before(jiffies, timeout + 1);
141}
142
143static bool gdrom_wait_busy_sleeps(void)
144{
145 unsigned long timeout;
146 /* Wait to get busy first */
147 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
148 while (!gdrom_is_busy() && time_before(jiffies, timeout))
149 cpu_relax();
150 /* Now wait for busy to clear */
151 return gdrom_wait_clrbusy();
152}
153
154static void gdrom_identifydevice(void *buf)
155{
156 int c;
157 short *data = buf;
158 /* If the device won't clear it has probably
159 * been hit by a serious failure - but we'll
160 * try to return a sense key even so */
161 if (!gdrom_wait_clrbusy()) {
162 gdrom_getsense(NULL);
163 return;
164 }
9eb79bb3 165 __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 166 if (!gdrom_wait_busy_sleeps()) {
167 gdrom_getsense(NULL);
168 return;
169 }
170 /* now read in the data */
171 for (c = 0; c < 40; c++)
9eb79bb3 172 data[c] = __raw_readw(GDROM_DATA_REG);
74ee1a75
AM		 173}
174
175static void gdrom_spicommand(void *spi_string, int buflen)
176{
177 short *cmd = spi_string;
178 unsigned long timeout;
179
180 /* ensure IRQ_WAIT is set */
9eb79bb3 181 __raw_writeb(0x08, GDROM_ALTSTATUS_REG);
74ee1a75 182 /* specify how many bytes we expect back */
9eb79bb3
PM		 183 __raw_writeb(buflen & 0xFF, GDROM_BCL_REG);
184 __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
74ee1a75 185 /* other parameters */
9eb79bb3
PM		 186 __raw_writeb(0, GDROM_INTSEC_REG);
187 __raw_writeb(0, GDROM_SECNUM_REG);
188 __raw_writeb(0, GDROM_ERROR_REG);
74ee1a75
AM		 189 /* Wait until we can go */
190 if (!gdrom_wait_clrbusy()) {
191 gdrom_getsense(NULL);
192 return;
193 }
194 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
9eb79bb3 195 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 196 while (!gdrom_data_request() && time_before(jiffies, timeout))
197 cpu_relax();
198 if (!time_before(jiffies, timeout + 1)) {
199 gdrom_getsense(NULL);
200 return;
201 }
54d5102f 202 outsw(GDROM_DATA_REG, cmd, 6);
74ee1a75
AM		 203}
204
205
206/* gdrom_command_executediagnostic:
207 * Used to probe for presence of working GDROM
208 * Restarts GDROM device and then applies standard ATA 3
209 * Execute Diagnostic Command: a return of '1' indicates device 0
210 * present and device 1 absent
211 */
212static char gdrom_execute_diagnostic(void)
213{
214 gdrom_hardreset(gd.cd_info);
215 if (!gdrom_wait_clrbusy())
216 return 0;
9eb79bb3 217 __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 218 if (!gdrom_wait_busy_sleeps())
219 return 0;
9eb79bb3 220 return __raw_readb(GDROM_ERROR_REG);
74ee1a75
AM		 221}
222
223/*
224 * Prepare disk command
225 * byte 0 = 0x70
226 * byte 1 = 0x1f
227 */
228static int gdrom_preparedisk_cmd(void)
229{
230 struct packet_command *spin_command;
231 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
232 if (!spin_command)
233 return -ENOMEM;
234 spin_command->cmd[0] = 0x70;
235 spin_command->cmd[2] = 0x1f;
236 spin_command->buflen = 0;
237 gd.pending = 1;
238 gdrom_packetcommand(gd.cd_info, spin_command);
239 /* 60 second timeout */
240 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
241 GDROM_DEFAULT_TIMEOUT);
242 gd.pending = 0;
243 kfree(spin_command);
244 if (gd.status & 0x01) {
245 /* log an error */
246 gdrom_getsense(NULL);
247 return -EIO;
248 }
249 return 0;
250}
251
252/*
253 * Read TOC command
254 * byte 0 = 0x14
255 * byte 1 = session
256 * byte 3 = sizeof TOC >> 8 ie upper byte
257 * byte 4 = sizeof TOC & 0xff ie lower byte
258 */
259static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
260{
261 int tocsize;
262 struct packet_command *toc_command;
263 int err = 0;
264
265 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
266 if (!toc_command)
267 return -ENOMEM;
268 tocsize = sizeof(struct gdromtoc);
269 toc_command->cmd[0] = 0x14;
270 toc_command->cmd[1] = session;
271 toc_command->cmd[3] = tocsize >> 8;
272 toc_command->cmd[4] = tocsize & 0xff;
273 toc_command->buflen = tocsize;
274 if (gd.pending) {
275 err = -EBUSY;
276 goto cleanup_readtoc_final;
277 }
278 gd.pending = 1;
279 gdrom_packetcommand(gd.cd_info, toc_command);
280 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
281 GDROM_DEFAULT_TIMEOUT);
282 if (gd.pending) {
283 err = -EINVAL;
284 goto cleanup_readtoc;
285 }
54d5102f 286 insw(GDROM_DATA_REG, toc, tocsize/2);
74ee1a75
AM		 287 if (gd.status & 0x01)
288 err = -EINVAL;
289
290cleanup_readtoc:
291 gd.pending = 0;
292cleanup_readtoc_final:
293 kfree(toc_command);
294 return err;
295}
296
297/* TOC helpers */
298static int get_entry_lba(int track)
299{
300 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
301}
302
303static int get_entry_q_ctrl(int track)
304{
305 return (track & 0x000000f0) >> 4;
306}
307
308static int get_entry_track(int track)
309{
310 return (track & 0x0000ff00) >> 8;
311}
312
313static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
314 struct cdrom_multisession *ms_info)
315{
cdffab7a 316 int fentry, lentry, track, data, err;
317
74ee1a75
AM		 318 if (!gd.toc)
319 return -ENOMEM;
cdffab7a 320
74ee1a75
AM		 321 /* Check if GD-ROM */
322 err = gdrom_readtoc_cmd(gd.toc, 1);
323 /* Not a GD-ROM so check if standard CD-ROM */
324 if (err) {
74ee1a75
AM		 325 err = gdrom_readtoc_cmd(gd.toc, 0);
326 if (err) {
e597cd09 327 pr_info("Could not get CD table of contents\n");
74ee1a75
AM		 328 return -ENXIO;
329 }
330 }
331
332 fentry = get_entry_track(gd.toc->first);
333 lentry = get_entry_track(gd.toc->last);
334 /* Find the first data track */
335 track = get_entry_track(gd.toc->last);
336 do {
337 data = gd.toc->entry[track - 1];
338 if (get_entry_q_ctrl(data))
339 break; /* ie a real data track */
340 track--;
341 } while (track >= fentry);
342
343 if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
e597cd09 344 pr_info("No data on the last session of the CD\n");
74ee1a75
AM		 345 gdrom_getsense(NULL);
346 return -ENXIO;
347 }
348
349 ms_info->addr_format = CDROM_LBA;
350 ms_info->addr.lba = get_entry_lba(data);
351 ms_info->xa_flag = 1;
352 return 0;
353}
354
355static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
356{
357 /* spin up the disk */
358 return gdrom_preparedisk_cmd();
359}
360
361/* this function is required even if empty */
362static void gdrom_release(struct cdrom_device_info *cd_info)
363{
364}
365
366static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
367{
368 /* read the sense key */
9eb79bb3 369 char sense = __raw_readb(GDROM_ERROR_REG);
74ee1a75
AM		 370 sense &= 0xF0;
371 if (sense == 0)
372 return CDS_DISC_OK;
373 if (sense == 0x20)
374 return CDS_DRIVE_NOT_READY;
375 /* default */
376 return CDS_NO_INFO;
377}
378
1c27030b
TH		 379static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
380 unsigned int clearing, int ignore)
74ee1a75
AM		 381{
382 /* check the sense key */
1c27030b
TH		 383 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
384 DISK_EVENT_MEDIA_CHANGE : 0;
74ee1a75
AM		 385}
386
387/* reset the G1 bus */
388static int gdrom_hardreset(struct cdrom_device_info *cd_info)
389{
390 int count;
9eb79bb3 391 __raw_writel(0x1fffff, GDROM_RESET_REG);
74ee1a75 392 for (count = 0xa0000000; count < 0xa0200000; count += 4)
9eb79bb3 393 __raw_readl(count);
74ee1a75
AM		 394 return 0;
395}
396
397/* keep the function looking like the universal
398 * CD Rom specification - returning int */
399static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
400 struct packet_command *command)
401{
402 gdrom_spicommand(&command->cmd, command->buflen);
403 return 0;
404}
405
406/* Get Sense SPI command
407 * From Marcus Comstedt
408 * cmd = 0x13
409 * cmd + 4 = length of returned buffer
410 * Returns 5 16 bit words
411 */
412static int gdrom_getsense(short *bufstring)
413{
414 struct packet_command *sense_command;
415 short sense[5];
416 int sense_key;
417 int err = -EIO;
418
419 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
420 if (!sense_command)
421 return -ENOMEM;
422 sense_command->cmd[0] = 0x13;
423 sense_command->cmd[4] = 10;
424 sense_command->buflen = 10;
425 /* even if something is pending try to get
426 * the sense key if possible */
427 if (gd.pending && !gdrom_wait_clrbusy()) {
428 err = -EBUSY;
429 goto cleanup_sense_final;
430 }
431 gd.pending = 1;
432 gdrom_packetcommand(gd.cd_info, sense_command);
433 wait_event_interruptible_timeout(command_queue, gd.pending == 0,
434 GDROM_DEFAULT_TIMEOUT);
435 if (gd.pending)
436 goto cleanup_sense;
54d5102f 437 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
74ee1a75 438 if (sense[1] & 40) {
e597cd09 439 pr_info("Drive not ready - command aborted\n");
74ee1a75
AM		 440 goto cleanup_sense;
441 }
442 sense_key = sense[1] & 0x0F;
443 if (sense_key < ARRAY_SIZE(sense_texts))
e597cd09 444 pr_info("%s\n", sense_texts[sense_key].text);
74ee1a75 445 else
e597cd09 446 pr_err("Unknown sense key: %d\n", sense_key);
74ee1a75
AM		 447 if (bufstring) /* return addional sense data */
448 memcpy(bufstring, &sense[4], 2);
449 if (sense_key < 2)
450 err = 0;
451
452cleanup_sense:
453 gd.pending = 0;
454cleanup_sense_final:
455 kfree(sense_command);
456 return err;
457}
458
d15cad5d
BP		 459static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
460 void *arg)
461{
462 return -EINVAL;
463}
464
853fe1bf 465static const struct cdrom_device_ops gdrom_ops = {
74ee1a75
AM		 466 .open = gdrom_open,
467 .release = gdrom_release,
468 .drive_status = gdrom_drivestatus,
1c27030b 469 .check_events = gdrom_check_events,
74ee1a75
AM		 470 .get_last_session = gdrom_get_last_session,
471 .reset = gdrom_hardreset,
d15cad5d 472 .audio_ioctl = gdrom_audio_ioctl,
853fe1bf 473 .generic_packet = cdrom_dummy_generic_packet,
74ee1a75
AM		 474 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
475 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
74ee1a75
AM		 476};
477
8389feb4 478static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
74ee1a75 479{
6e9624b8 480 int ret;
2bbea6e1
ML		 481
482 check_disk_change(bdev);
483
2a48fc0a 484 mutex_lock(&gdrom_mutex);
6e9624b8 485 ret = cdrom_open(gd.cd_info, bdev, mode);
2a48fc0a 486 mutex_unlock(&gdrom_mutex);
6e9624b8 487 return ret;
74ee1a75
AM		 488}
489
db2a144b 490static void gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
74ee1a75 491{
2a48fc0a 492 mutex_lock(&gdrom_mutex);
545727f3 493 cdrom_release(gd.cd_info, mode);
2a48fc0a 494 mutex_unlock(&gdrom_mutex);
74ee1a75
AM		 495}
496
1c27030b
TH		 497static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
498 unsigned int clearing)
74ee1a75 499{
1c27030b 500 return cdrom_check_events(gd.cd_info, clearing);
74ee1a75
AM		 501}
502
8389feb4 503static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
74ee1a75
AM		 504 unsigned cmd, unsigned long arg)
505{
8a6cfeb6
AB		 506 int ret;
507
2a48fc0a 508 mutex_lock(&gdrom_mutex);
8a6cfeb6 509 ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
2a48fc0a 510 mutex_unlock(&gdrom_mutex);
8a6cfeb6
AB		 511
512 return ret;
74ee1a75
AM		 513}
514
83d5cde4 515static const struct block_device_operations gdrom_bdops = {
74ee1a75 516 .owner = THIS_MODULE,
8389feb4
AV		 517 .open = gdrom_bdops_open,
518 .release = gdrom_bdops_release,
1c27030b 519 .check_events = gdrom_bdops_check_events,
8a6cfeb6 520 .ioctl = gdrom_bdops_ioctl,
74ee1a75
AM		 521};
522
523static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
524{
9eb79bb3 525 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 526 if (gd.pending != 1)
527 return IRQ_HANDLED;
528 gd.pending = 0;
529 wake_up_interruptible(&command_queue);
530 return IRQ_HANDLED;
531}
532
533static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
534{
9eb79bb3 535 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 536 if (gd.transfer != 1)
537 return IRQ_HANDLED;
538 gd.transfer = 0;
539 wake_up_interruptible(&request_queue);
540 return IRQ_HANDLED;
541}
542
0fe763c5 543static int gdrom_set_interrupt_handlers(void)
74ee1a75
AM		 544{
545 int err;
546
547 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
644ff181 548 0, "gdrom_command", &gd);
74ee1a75
AM		 549 if (err)
550 return err;
551 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
644ff181 552 0, "gdrom_dma", &gd);
74ee1a75
AM		 553 if (err)
554 free_irq(HW_EVENT_GDROM_CMD, &gd);
555 return err;
556}
557
558/* Implement DMA read using SPI command
559 * 0 -> 0x30
560 * 1 -> mode
561 * 2 -> block >> 16
562 * 3 -> block >> 8
563 * 4 -> block
564 * 8 -> sectors >> 16
565 * 9 -> sectors >> 8
566 * 10 -> sectors
567 */
ad5fc6bb 568static blk_status_t gdrom_readdisk_dma(struct request *req)
74ee1a75 569{
2a842aca
CH		 570 int block, block_cnt;
571 blk_status_t err;
74ee1a75 572 struct packet_command *read_command;
74ee1a75
AM		 573 unsigned long timeout;
574
74ee1a75
AM		 575 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
576 if (!read_command)
ad5fc6bb
JA		 577 return BLK_STS_RESOURCE;
578
74ee1a75
AM		 579 read_command->cmd[0] = 0x30;
580 read_command->cmd[1] = 0x20;
ad5fc6bb
JA		 581 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
582 block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
583 __raw_writel(virt_to_phys(bio_data(req->bio)), GDROM_DMA_STARTADDR_REG);
584 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
585 __raw_writel(1, GDROM_DMA_DIRECTION_REG);
586 __raw_writel(1, GDROM_DMA_ENABLE_REG);
587 read_command->cmd[2] = (block >> 16) & 0xFF;
588 read_command->cmd[3] = (block >> 8) & 0xFF;
589 read_command->cmd[4] = block & 0xFF;
590 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
591 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
592 read_command->cmd[10] = block_cnt & 0xFF;
593 /* set for DMA */
594 __raw_writeb(1, GDROM_ERROR_REG);
595 /* other registers */
596 __raw_writeb(0, GDROM_SECNUM_REG);
597 __raw_writeb(0, GDROM_BCL_REG);
598 __raw_writeb(0, GDROM_BCH_REG);
599 __raw_writeb(0, GDROM_DSEL_REG);
600 __raw_writeb(0, GDROM_INTSEC_REG);
601 /* Wait for registers to reset after any previous activity */
602 timeout = jiffies + HZ / 2;
603 while (gdrom_is_busy() && time_before(jiffies, timeout))
604 cpu_relax();
605 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
606 timeout = jiffies + HZ / 2;
607 /* Wait for packet command to finish */
608 while (gdrom_is_busy() && time_before(jiffies, timeout))
609 cpu_relax();
610 gd.pending = 1;
611 gd.transfer = 1;
612 outsw(GDROM_DATA_REG, &read_command->cmd, 6);
613 timeout = jiffies + HZ / 2;
614 /* Wait for any pending DMA to finish */
615 while (__raw_readb(GDROM_DMA_STATUS_REG) &&
616 time_before(jiffies, timeout))
617 cpu_relax();
618 /* start transfer */
619 __raw_writeb(1, GDROM_DMA_STATUS_REG);
620 wait_event_interruptible_timeout(request_queue,
621 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
622 err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
623 gd.transfer = 0;
624 gd.pending = 0;
625
626 blk_mq_end_request(req, err);
74ee1a75 627 kfree(read_command);
ad5fc6bb 628 return BLK_STS_OK;
74ee1a75
AM		 629}
630
ad5fc6bb
JA		 631static blk_status_t gdrom_queue_rq(struct blk_mq_hw_ctx *hctx,
632 const struct blk_mq_queue_data *bd)
633{
634 blk_mq_start_request(bd->rq);
635
636 switch (req_op(bd->rq)) {
637 case REQ_OP_READ:
638 return gdrom_readdisk_dma(bd->rq);
639 case REQ_OP_WRITE:
640 pr_notice("Read only device - write request ignored\n");
641 return BLK_STS_IOERR;
642 default:
643 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
644 return BLK_STS_IOERR;
74ee1a75
AM		 645 }
646}
647
648/* Print string identifying GD ROM device */
0fe763c5 649static int gdrom_outputversion(void)
74ee1a75
AM		 650{
651 struct gdrom_id *id;
652 char *model_name, *manuf_name, *firmw_ver;
653 int err = -ENOMEM;
654
655 /* query device ID */
656 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
657 if (!id)
658 return err;
659 gdrom_identifydevice(id);
660 model_name = kstrndup(id->modname, 16, GFP_KERNEL);
661 if (!model_name)
662 goto free_id;
663 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
664 if (!manuf_name)
665 goto free_model_name;
666 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
667 if (!firmw_ver)
668 goto free_manuf_name;
e597cd09 669 pr_info("%s from %s with firmware %s\n",
74ee1a75
AM		 670 model_name, manuf_name, firmw_ver);
671 err = 0;
672 kfree(firmw_ver);
673free_manuf_name:
674 kfree(manuf_name);
675free_model_name:
676 kfree(model_name);
677free_id:
678 kfree(id);
679 return err;
680}
681
682/* set the default mode for DMA transfer */
0fe763c5 683static int gdrom_init_dma_mode(void)
74ee1a75 684{
9eb79bb3
PM		 685 __raw_writeb(0x13, GDROM_ERROR_REG);
686 __raw_writeb(0x22, GDROM_INTSEC_REG);
74ee1a75
AM		 687 if (!gdrom_wait_clrbusy())
688 return -EBUSY;
9eb79bb3 689 __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG);
74ee1a75
AM		 690 if (!gdrom_wait_busy_sleeps())
691 return -EBUSY;
692 /* Memory protection setting for GDROM DMA
693 * Bits 31 - 16 security: 0x8843
694 * Bits 15 and 7 reserved (0)
695 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
696 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
697 * (0x40 | 0x80) = start range at 0x0C000000
698 * (0x7F | 0x80) = end range at 0x0FFFFFFF */
9eb79bb3
PM		 699 __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
700 __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
74ee1a75
AM		 701 return 0;
702}
703
0fe763c5 704static void probe_gdrom_setupcd(void)
74ee1a75
AM		 705{
706 gd.cd_info->ops = &gdrom_ops;
707 gd.cd_info->capacity = 1;
708 strcpy(gd.cd_info->name, GDROM_DEV_NAME);
709 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
710 CDC_SELECT_DISC;
711}
712
0fe763c5 713static void probe_gdrom_setupdisk(void)
74ee1a75
AM		 714{
715 gd.disk->major = gdrom_major;
716 gd.disk->first_minor = 1;
717 gd.disk->minors = 1;
718 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
719}
720
0fe763c5 721static int probe_gdrom_setupqueue(void)
74ee1a75 722{
e1defc4f 723 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
74ee1a75 724 /* using DMA so memory will need to be contiguous */
8a78362c 725 blk_queue_max_segments(gd.gdrom_rq, 1);
74ee1a75
AM		 726 /* set a large max size to get most from DMA */
727 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
728 gd.disk->queue = gd.gdrom_rq;
729 return gdrom_init_dma_mode();
730}
731
ad5fc6bb
JA		 732static const struct blk_mq_ops gdrom_mq_ops = {
733 .queue_rq = gdrom_queue_rq,
734};
735
74ee1a75
AM		 736/*
737 * register this as a block device and as compliant with the
738 * universal CD Rom driver interface
739 */
0fe763c5 740static int probe_gdrom(struct platform_device *devptr)
74ee1a75
AM		 741{
742 int err;
743 /* Start the device */
744 if (gdrom_execute_diagnostic() != 1) {
e597cd09 745 pr_warning("ATA Probe for GDROM failed\n");
74ee1a75
AM		 746 return -ENODEV;
747 }
748 /* Print out firmware ID */
749 if (gdrom_outputversion())
750 return -ENOMEM;
751 /* Register GDROM */
752 gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
753 if (gdrom_major <= 0)
754 return gdrom_major;
e597cd09 755 pr_info("Registered with major number %d\n",
74ee1a75
AM		 756 gdrom_major);
757 /* Specify basic properties of drive */
758 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
759 if (!gd.cd_info) {
760 err = -ENOMEM;
761 goto probe_fail_no_mem;
762 }
763 probe_gdrom_setupcd();
764 gd.disk = alloc_disk(1);
765 if (!gd.disk) {
766 err = -ENODEV;
767 goto probe_fail_no_disk;
768 }
769 probe_gdrom_setupdisk();
770 if (register_cdrom(gd.cd_info)) {
771 err = -ENODEV;
772 goto probe_fail_cdrom_register;
773 }
774 gd.disk->fops = &gdrom_bdops;
773008f6 775 gd.disk->events = DISK_EVENT_MEDIA_CHANGE;
74ee1a75
AM		 776 /* latch on to the interrupt */
777 err = gdrom_set_interrupt_handlers();
778 if (err)
779 goto probe_fail_cmdirq_register;
ad5fc6bb
JA		 780
781 gd.gdrom_rq = blk_mq_init_sq_queue(&gd.tag_set, &gdrom_mq_ops, 1,
782 BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
783 if (IS_ERR(gd.gdrom_rq)) {
0a40a935 784 err = PTR_ERR(gd.gdrom_rq);
ad5fc6bb 785 gd.gdrom_rq = NULL;
74ee1a75 786 goto probe_fail_requestq;
605cdf08 787 }
ad5fc6bb 788
8fc45044 789 blk_queue_bounce_limit(gd.gdrom_rq, BLK_BOUNCE_HIGH);
74ee1a75
AM		 790
791 err = probe_gdrom_setupqueue();
792 if (err)
793 goto probe_fail_toc;
794
795 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
605cdf08
CJ		 796 if (!gd.toc) {
797 err = -ENOMEM;
74ee1a75 798 goto probe_fail_toc;
605cdf08 799 }
74ee1a75
AM		 800 add_disk(gd.disk);
801 return 0;
802
803probe_fail_toc:
804 blk_cleanup_queue(gd.gdrom_rq);
ad5fc6bb 805 blk_mq_free_tag_set(&gd.tag_set);
74ee1a75
AM		 806probe_fail_requestq:
807 free_irq(HW_EVENT_GDROM_DMA, &gd);
808 free_irq(HW_EVENT_GDROM_CMD, &gd);
809probe_fail_cmdirq_register:
810probe_fail_cdrom_register:
811 del_gendisk(gd.disk);
812probe_fail_no_disk:
813 kfree(gd.cd_info);
31bd8fbb 814probe_fail_no_mem:
74ee1a75
AM		 815 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
816 gdrom_major = 0;
e597cd09 817 pr_warning("Probe failed - error is 0x%X\n", err);
74ee1a75
AM		 818 return err;
819}
820
0fe763c5 821static int remove_gdrom(struct platform_device *devptr)
74ee1a75 822{
74ee1a75 823 blk_cleanup_queue(gd.gdrom_rq);
ad5fc6bb 824 blk_mq_free_tag_set(&gd.tag_set);
74ee1a75
AM		 825 free_irq(HW_EVENT_GDROM_CMD, &gd);
826 free_irq(HW_EVENT_GDROM_DMA, &gd);
827 del_gendisk(gd.disk);
828 if (gdrom_major)
829 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
0a0c4114
AM		 830 unregister_cdrom(gd.cd_info);
831
832 return 0;
74ee1a75
AM		 833}
834
835static struct platform_driver gdrom_driver = {
836 .probe = probe_gdrom,
0fe763c5 837 .remove = remove_gdrom,
74ee1a75
AM		 838 .driver = {
839 .name = GDROM_DEV_NAME,
840 },
841};
842
843static int __init init_gdrom(void)
844{
845 int rc;
846 gd.toc = NULL;
847 rc = platform_driver_register(&gdrom_driver);
848 if (rc)
849 return rc;
850 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
851 if (IS_ERR(pd)) {
852 platform_driver_unregister(&gdrom_driver);
853 return PTR_ERR(pd);
854 }
855 return 0;
856}
857
858static void __exit exit_gdrom(void)
859{
860 platform_device_unregister(pd);
861 platform_driver_unregister(&gdrom_driver);
862 kfree(gd.toc);
093c4821 863 kfree(gd.cd_info);
74ee1a75
AM		 864}
865
866module_init(init_gdrom);
867module_exit(exit_gdrom);
868MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
869MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
870MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)