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mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / block / mg_disk.c
blob145ce2aa2e78ab3700deadb9792da9b2166dff58
1 /*
2 * drivers/block/mg_disk.c
3 *
4 * Support for the mGine m[g]flash IO mode.
5 * Based on legacy hd.c
6 *
7 * (c) 2008 mGine Co.,LTD
8 * (c) 2008 unsik Kim <donari75@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/fs.h>
18 #include <linux/blkdev.h>
19 #include <linux/hdreg.h>
20 #include <linux/ata.h>
21 #include <linux/interrupt.h>
22 #include <linux/delay.h>
23 #include <linux/platform_device.h>
24 #include <linux/gpio.h>
25 #include <linux/mg_disk.h>
26 #include <linux/slab.h>
27
28 #define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
29
30 /* name for block device */
31 #define MG_DISK_NAME "mgd"
32
33 #define MG_DISK_MAJ 0
34 #define MG_DISK_MAX_PART 16
35 #define MG_SECTOR_SIZE 512
36 #define MG_MAX_SECTS 256
37
38 /* Register offsets */
39 #define MG_BUFF_OFFSET 0x8000
40 #define MG_REG_OFFSET 0xC000
41 #define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */
42 #define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */
43 #define MG_REG_SECT_CNT (MG_REG_OFFSET + 4)
44 #define MG_REG_SECT_NUM (MG_REG_OFFSET + 6)
45 #define MG_REG_CYL_LOW (MG_REG_OFFSET + 8)
46 #define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA)
47 #define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC)
48 #define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */
49 #define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */
50 #define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10)
51 #define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12)
52
53 /* handy status */
54 #define MG_STAT_READY (ATA_DRDY | ATA_DSC)
55 #define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \
56 ATA_ERR))) == MG_STAT_READY)
57
58 /* error code for others */
59 #define MG_ERR_NONE 0
60 #define MG_ERR_TIMEOUT 0x100
61 #define MG_ERR_INIT_STAT 0x101
62 #define MG_ERR_TRANSLATION 0x102
63 #define MG_ERR_CTRL_RST 0x103
64 #define MG_ERR_INV_STAT 0x104
65 #define MG_ERR_RSTOUT 0x105
66
67 #define MG_MAX_ERRORS 6 /* Max read/write errors */
68
69 /* command */
70 #define MG_CMD_RD 0x20
71 #define MG_CMD_WR 0x30
72 #define MG_CMD_SLEEP 0x99
73 #define MG_CMD_WAKEUP 0xC3
74 #define MG_CMD_ID 0xEC
75 #define MG_CMD_WR_CONF 0x3C
76 #define MG_CMD_RD_CONF 0x40
77
78 /* operation mode */
79 #define MG_OP_CASCADE (1 << 0)
80 #define MG_OP_CASCADE_SYNC_RD (1 << 1)
81 #define MG_OP_CASCADE_SYNC_WR (1 << 2)
82 #define MG_OP_INTERLEAVE (1 << 3)
83
84 /* synchronous */
85 #define MG_BURST_LAT_4 (3 << 4)
86 #define MG_BURST_LAT_5 (4 << 4)
87 #define MG_BURST_LAT_6 (5 << 4)
88 #define MG_BURST_LAT_7 (6 << 4)
89 #define MG_BURST_LAT_8 (7 << 4)
90 #define MG_BURST_LEN_4 (1 << 1)
91 #define MG_BURST_LEN_8 (2 << 1)
92 #define MG_BURST_LEN_16 (3 << 1)
93 #define MG_BURST_LEN_32 (4 << 1)
94 #define MG_BURST_LEN_CONT (0 << 1)
95
96 /* timeout value (unit: ms) */
97 #define MG_TMAX_CONF_TO_CMD 1
98 #define MG_TMAX_WAIT_RD_DRQ 10
99 #define MG_TMAX_WAIT_WR_DRQ 500
100 #define MG_TMAX_RST_TO_BUSY 10
101 #define MG_TMAX_HDRST_TO_RDY 500
102 #define MG_TMAX_SWRST_TO_RDY 500
103 #define MG_TMAX_RSTOUT 3000
104
105 #define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
106
107 /* main structure for mflash driver */
108 struct mg_host {
109 struct device *dev;
110
111 struct request_queue *breq;
112 struct request *req;
113 spinlock_t lock;
114 struct gendisk *gd;
115
116 struct timer_list timer;
117 void (*mg_do_intr) (struct mg_host *);
118
119 u16 id[ATA_ID_WORDS];
120
121 u16 cyls;
122 u16 heads;
123 u16 sectors;
124 u32 n_sectors;
125 u32 nres_sectors;
126
127 void __iomem *dev_base;
128 unsigned int irq;
129 unsigned int rst;
130 unsigned int rstout;
131
132 u32 major;
133 u32 error;
134 };
135
136 /*
137 * Debugging macro and defines
138 */
139 #undef DO_MG_DEBUG
140 #ifdef DO_MG_DEBUG
141 # define MG_DBG(fmt, args...) \
142 printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
143 #else /* CONFIG_MG_DEBUG */
144 # define MG_DBG(fmt, args...) do { } while (0)
145 #endif /* CONFIG_MG_DEBUG */
146
147 static void mg_request(struct request_queue *);
148
149 static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes)
150 {
151 if (__blk_end_request(host->req, err, nr_bytes))
152 return true;
153
154 host->req = NULL;
155 return false;
156 }
157
158 static bool mg_end_request_cur(struct mg_host *host, int err)
159 {
160 return mg_end_request(host, err, blk_rq_cur_bytes(host->req));
161 }
162
163 static void mg_dump_status(const char *msg, unsigned int stat,
164 struct mg_host *host)
165 {
166 char *name = MG_DISK_NAME;
167
168 if (host->req)
169 name = host->req->rq_disk->disk_name;
170
171 printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
172 if (stat & ATA_BUSY)
173 printk("Busy ");
174 if (stat & ATA_DRDY)
175 printk("DriveReady ");
176 if (stat & ATA_DF)
177 printk("WriteFault ");
178 if (stat & ATA_DSC)
179 printk("SeekComplete ");
180 if (stat & ATA_DRQ)
181 printk("DataRequest ");
182 if (stat & ATA_CORR)
183 printk("CorrectedError ");
184 if (stat & ATA_ERR)
185 printk("Error ");
186 printk("}\n");
187 if ((stat & ATA_ERR) == 0) {
188 host->error = 0;
189 } else {
190 host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
191 printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
192 host->error & 0xff);
193 if (host->error & ATA_BBK)
194 printk("BadSector ");
195 if (host->error & ATA_UNC)
196 printk("UncorrectableError ");
197 if (host->error & ATA_IDNF)
198 printk("SectorIdNotFound ");
199 if (host->error & ATA_ABORTED)
200 printk("DriveStatusError ");
201 if (host->error & ATA_AMNF)
202 printk("AddrMarkNotFound ");
203 printk("}");
204 if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) {
205 if (host->req)
206 printk(", sector=%u",
207 (unsigned int)blk_rq_pos(host->req));
208 }
209 printk("\n");
210 }
211 }
212
213 static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
214 {
215 u8 status;
216 unsigned long expire, cur_jiffies;
217 struct mg_drv_data *prv_data = host->dev->platform_data;
218
219 host->error = MG_ERR_NONE;
220 expire = jiffies + msecs_to_jiffies(msec);
221
222 /* These 2 times dummy status read prevents reading invalid
223 * status. A very little time (3 times of mflash operating clk)
224 * is required for busy bit is set. Use dummy read instead of
225 * busy wait, because mflash's PLL is machine dependent.
226 */
227 if (prv_data->use_polling) {
228 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
229 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
230 }
231
232 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
233
234 do {
235 cur_jiffies = jiffies;
236 if (status & ATA_BUSY) {
237 if (expect == ATA_BUSY)
238 break;
239 } else {
240 /* Check the error condition! */
241 if (status & ATA_ERR) {
242 mg_dump_status("mg_wait", status, host);
243 break;
244 }
245
246 if (expect == MG_STAT_READY)
247 if (MG_READY_OK(status))
248 break;
249
250 if (expect == ATA_DRQ)
251 if (status & ATA_DRQ)
252 break;
253 }
254 if (!msec) {
255 mg_dump_status("not ready", status, host);
256 return MG_ERR_INV_STAT;
257 }
258
259 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
260 } while (time_before(cur_jiffies, expire));
261
262 if (time_after_eq(cur_jiffies, expire) && msec)
263 host->error = MG_ERR_TIMEOUT;
264
265 return host->error;
266 }
267
268 static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
269 {
270 unsigned long expire;
271
272 expire = jiffies + msecs_to_jiffies(msec);
273 while (time_before(jiffies, expire)) {
274 if (gpio_get_value(rstout) == 1)
275 return MG_ERR_NONE;
276 msleep(10);
277 }
278
279 return MG_ERR_RSTOUT;
280 }
281
282 static void mg_unexpected_intr(struct mg_host *host)
283 {
284 u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
285
286 mg_dump_status("mg_unexpected_intr", status, host);
287 }
288
289 static irqreturn_t mg_irq(int irq, void *dev_id)
290 {
291 struct mg_host *host = dev_id;
292 void (*handler)(struct mg_host *) = host->mg_do_intr;
293
294 spin_lock(&host->lock);
295
296 host->mg_do_intr = NULL;
297 del_timer(&host->timer);
298 if (!handler)
299 handler = mg_unexpected_intr;
300 handler(host);
301
302 spin_unlock(&host->lock);
303
304 return IRQ_HANDLED;
305 }
306
307 /* local copy of ata_id_string() */
308 static void mg_id_string(const u16 *id, unsigned char *s,
309 unsigned int ofs, unsigned int len)
310 {
311 unsigned int c;
312
313 BUG_ON(len & 1);
314
315 while (len > 0) {
316 c = id[ofs] >> 8;
317 *s = c;
318 s++;
319
320 c = id[ofs] & 0xff;
321 *s = c;
322 s++;
323
324 ofs++;
325 len -= 2;
326 }
327 }
328
329 /* local copy of ata_id_c_string() */
330 static void mg_id_c_string(const u16 *id, unsigned char *s,
331 unsigned int ofs, unsigned int len)
332 {
333 unsigned char *p;
334
335 mg_id_string(id, s, ofs, len - 1);
336
337 p = s + strnlen(s, len - 1);
338 while (p > s && p[-1] == ' ')
339 p--;
340 *p = '\0';
341 }
342
343 static int mg_get_disk_id(struct mg_host *host)
344 {
345 u32 i;
346 s32 err;
347 const u16 *id = host->id;
348 struct mg_drv_data *prv_data = host->dev->platform_data;
349 char fwrev[ATA_ID_FW_REV_LEN + 1];
350 char model[ATA_ID_PROD_LEN + 1];
351 char serial[ATA_ID_SERNO_LEN + 1];
352
353 if (!prv_data->use_polling)
354 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
355
356 outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
357 err = mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ);
358 if (err)
359 return err;
360
361 for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
362 host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
363 MG_BUFF_OFFSET + i * 2));
364
365 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
366 err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
367 if (err)
368 return err;
369
370 if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
371 return MG_ERR_TRANSLATION;
372
373 host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
374 host->cyls = id[ATA_ID_CYLS];
375 host->heads = id[ATA_ID_HEADS];
376 host->sectors = id[ATA_ID_SECTORS];
377
378 if (MG_RES_SEC && host->heads && host->sectors) {
379 /* modify cyls, n_sectors */
380 host->cyls = (host->n_sectors - MG_RES_SEC) /
381 host->heads / host->sectors;
382 host->nres_sectors = host->n_sectors - host->cyls *
383 host->heads * host->sectors;
384 host->n_sectors -= host->nres_sectors;
385 }
386
387 mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
388 mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
389 mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
390 printk(KERN_INFO "mg_disk: model: %s\n", model);
391 printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
392 printk(KERN_INFO "mg_disk: serial: %s\n", serial);
393 printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
394 host->n_sectors, host->nres_sectors);
395
396 if (!prv_data->use_polling)
397 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
398
399 return err;
400 }
401
402
403 static int mg_disk_init(struct mg_host *host)
404 {
405 struct mg_drv_data *prv_data = host->dev->platform_data;
406 s32 err;
407 u8 init_status;
408
409 /* hdd rst low */
410 gpio_set_value(host->rst, 0);
411 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
412 if (err)
413 return err;
414
415 /* hdd rst high */
416 gpio_set_value(host->rst, 1);
417 err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
418 if (err)
419 return err;
420
421 /* soft reset on */
422 outb(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0),
423 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
424 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
425 if (err)
426 return err;
427
428 /* soft reset off */
429 outb(prv_data->use_polling ? ATA_NIEN : 0,
430 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
431 err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
432 if (err)
433 return err;
434
435 init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
436
437 if (init_status == 0xf)
438 return MG_ERR_INIT_STAT;
439
440 return err;
441 }
442
443 static void mg_bad_rw_intr(struct mg_host *host)
444 {
445 if (host->req)
446 if (++host->req->errors >= MG_MAX_ERRORS ||
447 host->error == MG_ERR_TIMEOUT)
448 mg_end_request_cur(host, -EIO);
449 }
450
451 static unsigned int mg_out(struct mg_host *host,
452 unsigned int sect_num,
453 unsigned int sect_cnt,
454 unsigned int cmd,
455 void (*intr_addr)(struct mg_host *))
456 {
457 struct mg_drv_data *prv_data = host->dev->platform_data;
458
459 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
460 return host->error;
461
462 if (!prv_data->use_polling) {
463 host->mg_do_intr = intr_addr;
464 mod_timer(&host->timer, jiffies + 3 * HZ);
465 }
466 if (MG_RES_SEC)
467 sect_num += MG_RES_SEC;
468 outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
469 outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
470 outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
471 MG_REG_CYL_LOW);
472 outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
473 MG_REG_CYL_HIGH);
474 outb((u8)((sect_num >> 24) | ATA_LBA | ATA_DEVICE_OBS),
475 (unsigned long)host->dev_base + MG_REG_DRV_HEAD);
476 outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
477 return MG_ERR_NONE;
478 }
479
480 static void mg_read_one(struct mg_host *host, struct request *req)
481 {
482 u16 *buff = (u16 *)bio_data(req->bio);
483 u32 i;
484
485 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
486 *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
487 (i << 1));
488 }
489
490 static void mg_read(struct request *req)
491 {
492 struct mg_host *host = req->rq_disk->private_data;
493
494 if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
495 MG_CMD_RD, NULL) != MG_ERR_NONE)
496 mg_bad_rw_intr(host);
497
498 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
499 blk_rq_sectors(req), blk_rq_pos(req), bio_data(req->bio));
500
501 do {
502 if (mg_wait(host, ATA_DRQ,
503 MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
504 mg_bad_rw_intr(host);
505 return;
506 }
507
508 mg_read_one(host, req);
509
510 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
511 MG_REG_COMMAND);
512 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
513 }
514
515 static void mg_write_one(struct mg_host *host, struct request *req)
516 {
517 u16 *buff = (u16 *)bio_data(req->bio);
518 u32 i;
519
520 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
521 outw(*buff++, (unsigned long)host->dev_base + MG_BUFF_OFFSET +
522 (i << 1));
523 }
524
525 static void mg_write(struct request *req)
526 {
527 struct mg_host *host = req->rq_disk->private_data;
528 unsigned int rem = blk_rq_sectors(req);
529
530 if (mg_out(host, blk_rq_pos(req), rem,
531 MG_CMD_WR, NULL) != MG_ERR_NONE) {
532 mg_bad_rw_intr(host);
533 return;
534 }
535
536 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
537 rem, blk_rq_pos(req), bio_data(req->bio));
538
539 if (mg_wait(host, ATA_DRQ,
540 MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
541 mg_bad_rw_intr(host);
542 return;
543 }
544
545 do {
546 mg_write_one(host, req);
547
548 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
549 MG_REG_COMMAND);
550
551 rem--;
552 if (rem > 1 && mg_wait(host, ATA_DRQ,
553 MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
554 mg_bad_rw_intr(host);
555 return;
556 } else if (mg_wait(host, MG_STAT_READY,
557 MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
558 mg_bad_rw_intr(host);
559 return;
560 }
561 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
562 }
563
564 static void mg_read_intr(struct mg_host *host)
565 {
566 struct request *req = host->req;
567 u32 i;
568
569 /* check status */
570 do {
571 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
572 if (i & ATA_BUSY)
573 break;
574 if (!MG_READY_OK(i))
575 break;
576 if (i & ATA_DRQ)
577 goto ok_to_read;
578 } while (0);
579 mg_dump_status("mg_read_intr", i, host);
580 mg_bad_rw_intr(host);
581 mg_request(host->breq);
582 return;
583
584 ok_to_read:
585 mg_read_one(host, req);
586
587 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
588 blk_rq_pos(req), blk_rq_sectors(req) - 1, bio_data(req->bio));
589
590 /* send read confirm */
591 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
592
593 if (mg_end_request(host, 0, MG_SECTOR_SIZE)) {
594 /* set handler if read remains */
595 host->mg_do_intr = mg_read_intr;
596 mod_timer(&host->timer, jiffies + 3 * HZ);
597 } else /* goto next request */
598 mg_request(host->breq);
599 }
600
601 static void mg_write_intr(struct mg_host *host)
602 {
603 struct request *req = host->req;
604 u32 i;
605 bool rem;
606
607 /* check status */
608 do {
609 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
610 if (i & ATA_BUSY)
611 break;
612 if (!MG_READY_OK(i))
613 break;
614 if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
615 goto ok_to_write;
616 } while (0);
617 mg_dump_status("mg_write_intr", i, host);
618 mg_bad_rw_intr(host);
619 mg_request(host->breq);
620 return;
621
622 ok_to_write:
623 if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
624 /* write 1 sector and set handler if remains */
625 mg_write_one(host, req);
626 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
627 blk_rq_pos(req), blk_rq_sectors(req), bio_data(req->bio));
628 host->mg_do_intr = mg_write_intr;
629 mod_timer(&host->timer, jiffies + 3 * HZ);
630 }
631
632 /* send write confirm */
633 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
634
635 if (!rem)
636 mg_request(host->breq);
637 }
638
639 static void mg_times_out(unsigned long data)
640 {
641 struct mg_host *host = (struct mg_host *)data;
642 char *name;
643
644 spin_lock_irq(&host->lock);
645
646 if (!host->req)
647 goto out_unlock;
648
649 host->mg_do_intr = NULL;
650
651 name = host->req->rq_disk->disk_name;
652 printk(KERN_DEBUG "%s: timeout\n", name);
653
654 host->error = MG_ERR_TIMEOUT;
655 mg_bad_rw_intr(host);
656
657 out_unlock:
658 mg_request(host->breq);
659 spin_unlock_irq(&host->lock);
660 }
661
662 static void mg_request_poll(struct request_queue *q)
663 {
664 struct mg_host *host = q->queuedata;
665
666 while (1) {
667 if (!host->req) {
668 host->req = blk_fetch_request(q);
669 if (!host->req)
670 break;
671 }
672
673 if (unlikely(host->req->cmd_type != REQ_TYPE_FS)) {
674 mg_end_request_cur(host, -EIO);
675 continue;
676 }
677
678 if (rq_data_dir(host->req) == READ)
679 mg_read(host->req);
680 else
681 mg_write(host->req);
682 }
683 }
684
685 static unsigned int mg_issue_req(struct request *req,
686 struct mg_host *host,
687 unsigned int sect_num,
688 unsigned int sect_cnt)
689 {
690 switch (rq_data_dir(req)) {
691 case READ:
692 if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
693 != MG_ERR_NONE) {
694 mg_bad_rw_intr(host);
695 return host->error;
696 }
697 break;
698 case WRITE:
699 /* TODO : handler */
700 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
701 if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
702 != MG_ERR_NONE) {
703 mg_bad_rw_intr(host);
704 return host->error;
705 }
706 del_timer(&host->timer);
707 mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
708 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
709 if (host->error) {
710 mg_bad_rw_intr(host);
711 return host->error;
712 }
713 mg_write_one(host, req);
714 mod_timer(&host->timer, jiffies + 3 * HZ);
715 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
716 MG_REG_COMMAND);
717 break;
718 }
719 return MG_ERR_NONE;
720 }
721
722 /* This function also called from IRQ context */
723 static void mg_request(struct request_queue *q)
724 {
725 struct mg_host *host = q->queuedata;
726 struct request *req;
727 u32 sect_num, sect_cnt;
728
729 while (1) {
730 if (!host->req) {
731 host->req = blk_fetch_request(q);
732 if (!host->req)
733 break;
734 }
735 req = host->req;
736
737 /* check unwanted request call */
738 if (host->mg_do_intr)
739 return;
740
741 del_timer(&host->timer);
742
743 sect_num = blk_rq_pos(req);
744 /* deal whole segments */
745 sect_cnt = blk_rq_sectors(req);
746
747 /* sanity check */
748 if (sect_num >= get_capacity(req->rq_disk) ||
749 ((sect_num + sect_cnt) >
750 get_capacity(req->rq_disk))) {
751 printk(KERN_WARNING
752 "%s: bad access: sector=%d, count=%d\n",
753 req->rq_disk->disk_name,
754 sect_num, sect_cnt);
755 mg_end_request_cur(host, -EIO);
756 continue;
757 }
758
759 if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
760 mg_end_request_cur(host, -EIO);
761 continue;
762 }
763
764 if (!mg_issue_req(req, host, sect_num, sect_cnt))
765 return;
766 }
767 }
768
769 static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
770 {
771 struct mg_host *host = bdev->bd_disk->private_data;
772
773 geo->cylinders = (unsigned short)host->cyls;
774 geo->heads = (unsigned char)host->heads;
775 geo->sectors = (unsigned char)host->sectors;
776 return 0;
777 }
778
779 static const struct block_device_operations mg_disk_ops = {
780 .getgeo = mg_getgeo
781 };
782
783 #ifdef CONFIG_PM_SLEEP
784 static int mg_suspend(struct device *dev)
785 {
786 struct mg_drv_data *prv_data = dev->platform_data;
787 struct mg_host *host = prv_data->host;
788
789 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
790 return -EIO;
791
792 if (!prv_data->use_polling)
793 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
794
795 outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
796 /* wait until mflash deep sleep */
797 msleep(1);
798
799 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
800 if (!prv_data->use_polling)
801 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
802 return -EIO;
803 }
804
805 return 0;
806 }
807
808 static int mg_resume(struct device *dev)
809 {
810 struct mg_drv_data *prv_data = dev->platform_data;
811 struct mg_host *host = prv_data->host;
812
813 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
814 return -EIO;
815
816 outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
817 /* wait until mflash wakeup */
818 msleep(1);
819
820 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
821 return -EIO;
822
823 if (!prv_data->use_polling)
824 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
825
826 return 0;
827 }
828 #endif
829
830 static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume);
831
832 static int mg_probe(struct platform_device *plat_dev)
833 {
834 struct mg_host *host;
835 struct resource *rsc;
836 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
837 int err = 0;
838
839 if (!prv_data) {
840 printk(KERN_ERR "%s:%d fail (no driver_data)\n",
841 __func__, __LINE__);
842 err = -EINVAL;
843 goto probe_err;
844 }
845
846 /* alloc mg_host */
847 host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
848 if (!host) {
849 printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
850 __func__, __LINE__);
851 err = -ENOMEM;
852 goto probe_err;
853 }
854 host->major = MG_DISK_MAJ;
855
856 /* link each other */
857 prv_data->host = host;
858 host->dev = &plat_dev->dev;
859
860 /* io remap */
861 rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
862 if (!rsc) {
863 printk(KERN_ERR "%s:%d platform_get_resource fail\n",
864 __func__, __LINE__);
865 err = -EINVAL;
866 goto probe_err_2;
867 }
868 host->dev_base = ioremap(rsc->start, resource_size(rsc));
869 if (!host->dev_base) {
870 printk(KERN_ERR "%s:%d ioremap fail\n",
871 __func__, __LINE__);
872 err = -EIO;
873 goto probe_err_2;
874 }
875 MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
876
877 /* get reset pin */
878 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
879 MG_RST_PIN);
880 if (!rsc) {
881 printk(KERN_ERR "%s:%d get reset pin fail\n",
882 __func__, __LINE__);
883 err = -EIO;
884 goto probe_err_3;
885 }
886 host->rst = rsc->start;
887
888 /* init rst pin */
889 err = gpio_request(host->rst, MG_RST_PIN);
890 if (err)
891 goto probe_err_3;
892 gpio_direction_output(host->rst, 1);
893
894 /* reset out pin */
895 if (!(prv_data->dev_attr & MG_DEV_MASK)) {
896 err = -EINVAL;
897 goto probe_err_3a;
898 }
899
900 if (prv_data->dev_attr != MG_BOOT_DEV) {
901 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
902 MG_RSTOUT_PIN);
903 if (!rsc) {
904 printk(KERN_ERR "%s:%d get reset-out pin fail\n",
905 __func__, __LINE__);
906 err = -EIO;
907 goto probe_err_3a;
908 }
909 host->rstout = rsc->start;
910 err = gpio_request(host->rstout, MG_RSTOUT_PIN);
911 if (err)
912 goto probe_err_3a;
913 gpio_direction_input(host->rstout);
914 }
915
916 /* disk reset */
917 if (prv_data->dev_attr == MG_STORAGE_DEV) {
918 /* If POR seq. not yet finished, wait */
919 err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
920 if (err)
921 goto probe_err_3b;
922 err = mg_disk_init(host);
923 if (err) {
924 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
925 __func__, __LINE__, err);
926 err = -EIO;
927 goto probe_err_3b;
928 }
929 }
930
931 /* get irq resource */
932 if (!prv_data->use_polling) {
933 host->irq = platform_get_irq(plat_dev, 0);
934 if (host->irq == -ENXIO) {
935 err = host->irq;
936 goto probe_err_3b;
937 }
938 err = request_irq(host->irq, mg_irq,
939 IRQF_TRIGGER_RISING,
940 MG_DEV_NAME, host);
941 if (err) {
942 printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
943 __func__, __LINE__, err);
944 goto probe_err_3b;
945 }
946
947 }
948
949 /* get disk id */
950 err = mg_get_disk_id(host);
951 if (err) {
952 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
953 __func__, __LINE__, err);
954 err = -EIO;
955 goto probe_err_4;
956 }
957
958 err = register_blkdev(host->major, MG_DISK_NAME);
959 if (err < 0) {
960 printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
961 __func__, __LINE__, err);
962 goto probe_err_4;
963 }
964 if (!host->major)
965 host->major = err;
966
967 spin_lock_init(&host->lock);
968
969 if (prv_data->use_polling)
970 host->breq = blk_init_queue(mg_request_poll, &host->lock);
971 else
972 host->breq = blk_init_queue(mg_request, &host->lock);
973
974 if (!host->breq) {
975 err = -ENOMEM;
976 printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
977 __func__, __LINE__);
978 goto probe_err_5;
979 }
980 host->breq->queuedata = host;
981
982 /* mflash is random device, thanx for the noop */
983 err = elevator_change(host->breq, "noop");
984 if (err) {
985 printk(KERN_ERR "%s:%d (elevator_init) fail\n",
986 __func__, __LINE__);
987 goto probe_err_6;
988 }
989 blk_queue_max_hw_sectors(host->breq, MG_MAX_SECTS);
990 blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE);
991
992 init_timer(&host->timer);
993 host->timer.function = mg_times_out;
994 host->timer.data = (unsigned long)host;
995
996 host->gd = alloc_disk(MG_DISK_MAX_PART);
997 if (!host->gd) {
998 printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
999 __func__, __LINE__);
1000 err = -ENOMEM;
1001 goto probe_err_7;
1002 }
1003 host->gd->major = host->major;
1004 host->gd->first_minor = 0;
1005 host->gd->fops = &mg_disk_ops;
1006 host->gd->queue = host->breq;
1007 host->gd->private_data = host;
1008 sprintf(host->gd->disk_name, MG_DISK_NAME"a");
1009
1010 set_capacity(host->gd, host->n_sectors);
1011
1012 add_disk(host->gd);
1013
1014 return err;
1015
1016 probe_err_7:
1017 del_timer_sync(&host->timer);
1018 probe_err_6:
1019 blk_cleanup_queue(host->breq);
1020 probe_err_5:
1021 unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
1022 probe_err_4:
1023 if (!prv_data->use_polling)
1024 free_irq(host->irq, host);
1025 probe_err_3b:
1026 gpio_free(host->rstout);
1027 probe_err_3a:
1028 gpio_free(host->rst);
1029 probe_err_3:
1030 iounmap(host->dev_base);
1031 probe_err_2:
1032 kfree(host);
1033 probe_err:
1034 return err;
1035 }
1036
1037 static int mg_remove(struct platform_device *plat_dev)
1038 {
1039 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
1040 struct mg_host *host = prv_data->host;
1041 int err = 0;
1042
1043 /* delete timer */
1044 del_timer_sync(&host->timer);
1045
1046 /* remove disk */
1047 if (host->gd) {
1048 del_gendisk(host->gd);
1049 put_disk(host->gd);
1050 }
1051 /* remove queue */
1052 if (host->breq)
1053 blk_cleanup_queue(host->breq);
1054
1055 /* unregister blk device */
1056 unregister_blkdev(host->major, MG_DISK_NAME);
1057
1058 /* free irq */
1059 if (!prv_data->use_polling)
1060 free_irq(host->irq, host);
1061
1062 /* free reset-out pin */
1063 if (prv_data->dev_attr != MG_BOOT_DEV)
1064 gpio_free(host->rstout);
1065
1066 /* free rst pin */
1067 if (host->rst)
1068 gpio_free(host->rst);
1069
1070 /* unmap io */
1071 if (host->dev_base)
1072 iounmap(host->dev_base);
1073
1074 /* free mg_host */
1075 kfree(host);
1076
1077 return err;
1078 }
1079
1080 static struct platform_driver mg_disk_driver = {
1081 .probe = mg_probe,
1082 .remove = mg_remove,
1083 .driver = {
1084 .name = MG_DEV_NAME,
1085 .pm = &mg_pm,
1086 }
1087 };
1088
1089 /****************************************************************************
1090 *
1091 * Module stuff
1092 *
1093 ****************************************************************************/
1094
1095 static int __init mg_init(void)
1096 {
1097 printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1098 return platform_driver_register(&mg_disk_driver);
1099 }
1100
1101 static void __exit mg_exit(void)
1102 {
1103 printk(KERN_INFO "mflash driver : bye bye\n");
1104 platform_driver_unregister(&mg_disk_driver);
1105 }
1106
1107 module_init(mg_init);
1108 module_exit(mg_exit);
1109
1110 MODULE_LICENSE("GPL");
1111 MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1112 MODULE_DESCRIPTION("mGine m[g]flash device driver");
Linux with added FPC-III support