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block: implement and enforce request peek/start/fetch
[mirror_ubuntu-bionic-kernel.git] / drivers / block / mg_disk.c
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
26 #define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
27
28 /* name for block device */
29 #define MG_DISK_NAME "mgd"
30 /* name for platform device */
31 #define MG_DEV_NAME "mg_disk"
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_STORAGE_BUFFER_SIZE 0x200
41 #define MG_REG_OFFSET 0xC000
42 #define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */
43 #define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */
44 #define MG_REG_SECT_CNT (MG_REG_OFFSET + 4)
45 #define MG_REG_SECT_NUM (MG_REG_OFFSET + 6)
46 #define MG_REG_CYL_LOW (MG_REG_OFFSET + 8)
47 #define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA)
48 #define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC)
49 #define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */
50 #define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */
51 #define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10)
52 #define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12)
53
54 /* handy status */
55 #define MG_STAT_READY (ATA_DRDY | ATA_DSC)
56 #define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \
57 ATA_ERR))) == MG_STAT_READY)
58
59 /* error code for others */
60 #define MG_ERR_NONE 0
61 #define MG_ERR_TIMEOUT 0x100
62 #define MG_ERR_INIT_STAT 0x101
63 #define MG_ERR_TRANSLATION 0x102
64 #define MG_ERR_CTRL_RST 0x103
65 #define MG_ERR_INV_STAT 0x104
66 #define MG_ERR_RSTOUT 0x105
67
68 #define MG_MAX_ERRORS 6 /* Max read/write errors */
69
70 /* command */
71 #define MG_CMD_RD 0x20
72 #define MG_CMD_WR 0x30
73 #define MG_CMD_SLEEP 0x99
74 #define MG_CMD_WAKEUP 0xC3
75 #define MG_CMD_ID 0xEC
76 #define MG_CMD_WR_CONF 0x3C
77 #define MG_CMD_RD_CONF 0x40
78
79 /* operation mode */
80 #define MG_OP_CASCADE (1 << 0)
81 #define MG_OP_CASCADE_SYNC_RD (1 << 1)
82 #define MG_OP_CASCADE_SYNC_WR (1 << 2)
83 #define MG_OP_INTERLEAVE (1 << 3)
84
85 /* synchronous */
86 #define MG_BURST_LAT_4 (3 << 4)
87 #define MG_BURST_LAT_5 (4 << 4)
88 #define MG_BURST_LAT_6 (5 << 4)
89 #define MG_BURST_LAT_7 (6 << 4)
90 #define MG_BURST_LAT_8 (7 << 4)
91 #define MG_BURST_LEN_4 (1 << 1)
92 #define MG_BURST_LEN_8 (2 << 1)
93 #define MG_BURST_LEN_16 (3 << 1)
94 #define MG_BURST_LEN_32 (4 << 1)
95 #define MG_BURST_LEN_CONT (0 << 1)
96
97 /* timeout value (unit: ms) */
98 #define MG_TMAX_CONF_TO_CMD 1
99 #define MG_TMAX_WAIT_RD_DRQ 10
100 #define MG_TMAX_WAIT_WR_DRQ 500
101 #define MG_TMAX_RST_TO_BUSY 10
102 #define MG_TMAX_HDRST_TO_RDY 500
103 #define MG_TMAX_SWRST_TO_RDY 500
104 #define MG_TMAX_RSTOUT 3000
105
106 /* device attribution */
107 /* use mflash as boot device */
108 #define MG_BOOT_DEV (1 << 0)
109 /* use mflash as storage device */
110 #define MG_STORAGE_DEV (1 << 1)
111 /* same as MG_STORAGE_DEV, but bootloader already done reset sequence */
112 #define MG_STORAGE_DEV_SKIP_RST (1 << 2)
113
114 #define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
115
116 /* names of GPIO resource */
117 #define MG_RST_PIN "mg_rst"
118 /* except MG_BOOT_DEV, reset-out pin should be assigned */
119 #define MG_RSTOUT_PIN "mg_rstout"
120
121 /* private driver data */
122 struct mg_drv_data {
123 /* disk resource */
124 u32 use_polling;
125
126 /* device attribution */
127 u32 dev_attr;
128
129 /* internally used */
130 struct mg_host *host;
131 };
132
133 /* main structure for mflash driver */
134 struct mg_host {
135 struct device *dev;
136
137 struct request_queue *breq;
138 struct request *req;
139 spinlock_t lock;
140 struct gendisk *gd;
141
142 struct timer_list timer;
143 void (*mg_do_intr) (struct mg_host *);
144
145 u16 id[ATA_ID_WORDS];
146
147 u16 cyls;
148 u16 heads;
149 u16 sectors;
150 u32 n_sectors;
151 u32 nres_sectors;
152
153 void __iomem *dev_base;
154 unsigned int irq;
155 unsigned int rst;
156 unsigned int rstout;
157
158 u32 major;
159 u32 error;
160 };
161
162 /*
163 * Debugging macro and defines
164 */
165 #undef DO_MG_DEBUG
166 #ifdef DO_MG_DEBUG
167 # define MG_DBG(fmt, args...) \
168 printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
169 #else /* CONFIG_MG_DEBUG */
170 # define MG_DBG(fmt, args...) do { } while (0)
171 #endif /* CONFIG_MG_DEBUG */
172
173 static void mg_request(struct request_queue *);
174
175 static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes)
176 {
177 if (__blk_end_request(host->req, err, nr_bytes))
178 return true;
179
180 host->req = NULL;
181 return false;
182 }
183
184 static bool mg_end_request_cur(struct mg_host *host, int err)
185 {
186 return mg_end_request(host, err, blk_rq_cur_bytes(host->req));
187 }
188
189 static void mg_dump_status(const char *msg, unsigned int stat,
190 struct mg_host *host)
191 {
192 char *name = MG_DISK_NAME;
193
194 if (host->req)
195 name = host->req->rq_disk->disk_name;
196
197 printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
198 if (stat & ATA_BUSY)
199 printk("Busy ");
200 if (stat & ATA_DRDY)
201 printk("DriveReady ");
202 if (stat & ATA_DF)
203 printk("WriteFault ");
204 if (stat & ATA_DSC)
205 printk("SeekComplete ");
206 if (stat & ATA_DRQ)
207 printk("DataRequest ");
208 if (stat & ATA_CORR)
209 printk("CorrectedError ");
210 if (stat & ATA_ERR)
211 printk("Error ");
212 printk("}\n");
213 if ((stat & ATA_ERR) == 0) {
214 host->error = 0;
215 } else {
216 host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
217 printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
218 host->error & 0xff);
219 if (host->error & ATA_BBK)
220 printk("BadSector ");
221 if (host->error & ATA_UNC)
222 printk("UncorrectableError ");
223 if (host->error & ATA_IDNF)
224 printk("SectorIdNotFound ");
225 if (host->error & ATA_ABORTED)
226 printk("DriveStatusError ");
227 if (host->error & ATA_AMNF)
228 printk("AddrMarkNotFound ");
229 printk("}");
230 if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) {
231 if (host->req)
232 printk(", sector=%u",
233 (unsigned int)blk_rq_pos(host->req));
234 }
235 printk("\n");
236 }
237 }
238
239 static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
240 {
241 u8 status;
242 unsigned long expire, cur_jiffies;
243 struct mg_drv_data *prv_data = host->dev->platform_data;
244
245 host->error = MG_ERR_NONE;
246 expire = jiffies + msecs_to_jiffies(msec);
247
248 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
249
250 do {
251 cur_jiffies = jiffies;
252 if (status & ATA_BUSY) {
253 if (expect == ATA_BUSY)
254 break;
255 } else {
256 /* Check the error condition! */
257 if (status & ATA_ERR) {
258 mg_dump_status("mg_wait", status, host);
259 break;
260 }
261
262 if (expect == MG_STAT_READY)
263 if (MG_READY_OK(status))
264 break;
265
266 if (expect == ATA_DRQ)
267 if (status & ATA_DRQ)
268 break;
269 }
270 if (!msec) {
271 mg_dump_status("not ready", status, host);
272 return MG_ERR_INV_STAT;
273 }
274 if (prv_data->use_polling)
275 msleep(1);
276
277 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
278 } while (time_before(cur_jiffies, expire));
279
280 if (time_after_eq(cur_jiffies, expire) && msec)
281 host->error = MG_ERR_TIMEOUT;
282
283 return host->error;
284 }
285
286 static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
287 {
288 unsigned long expire;
289
290 expire = jiffies + msecs_to_jiffies(msec);
291 while (time_before(jiffies, expire)) {
292 if (gpio_get_value(rstout) == 1)
293 return MG_ERR_NONE;
294 msleep(10);
295 }
296
297 return MG_ERR_RSTOUT;
298 }
299
300 static void mg_unexpected_intr(struct mg_host *host)
301 {
302 u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
303
304 mg_dump_status("mg_unexpected_intr", status, host);
305 }
306
307 static irqreturn_t mg_irq(int irq, void *dev_id)
308 {
309 struct mg_host *host = dev_id;
310 void (*handler)(struct mg_host *) = host->mg_do_intr;
311
312 spin_lock(&host->lock);
313
314 host->mg_do_intr = NULL;
315 del_timer(&host->timer);
316 if (!handler)
317 handler = mg_unexpected_intr;
318 handler(host);
319
320 spin_unlock(&host->lock);
321
322 return IRQ_HANDLED;
323 }
324
325 /* local copy of ata_id_string() */
326 static void mg_id_string(const u16 *id, unsigned char *s,
327 unsigned int ofs, unsigned int len)
328 {
329 unsigned int c;
330
331 BUG_ON(len & 1);
332
333 while (len > 0) {
334 c = id[ofs] >> 8;
335 *s = c;
336 s++;
337
338 c = id[ofs] & 0xff;
339 *s = c;
340 s++;
341
342 ofs++;
343 len -= 2;
344 }
345 }
346
347 /* local copy of ata_id_c_string() */
348 static void mg_id_c_string(const u16 *id, unsigned char *s,
349 unsigned int ofs, unsigned int len)
350 {
351 unsigned char *p;
352
353 mg_id_string(id, s, ofs, len - 1);
354
355 p = s + strnlen(s, len - 1);
356 while (p > s && p[-1] == ' ')
357 p--;
358 *p = '\0';
359 }
360
361 static int mg_get_disk_id(struct mg_host *host)
362 {
363 u32 i;
364 s32 err;
365 const u16 *id = host->id;
366 struct mg_drv_data *prv_data = host->dev->platform_data;
367 char fwrev[ATA_ID_FW_REV_LEN + 1];
368 char model[ATA_ID_PROD_LEN + 1];
369 char serial[ATA_ID_SERNO_LEN + 1];
370
371 if (!prv_data->use_polling)
372 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
373
374 outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
375 err = mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ);
376 if (err)
377 return err;
378
379 for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
380 host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
381 MG_BUFF_OFFSET + i * 2));
382
383 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
384 err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
385 if (err)
386 return err;
387
388 if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
389 return MG_ERR_TRANSLATION;
390
391 host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
392 host->cyls = id[ATA_ID_CYLS];
393 host->heads = id[ATA_ID_HEADS];
394 host->sectors = id[ATA_ID_SECTORS];
395
396 if (MG_RES_SEC && host->heads && host->sectors) {
397 /* modify cyls, n_sectors */
398 host->cyls = (host->n_sectors - MG_RES_SEC) /
399 host->heads / host->sectors;
400 host->nres_sectors = host->n_sectors - host->cyls *
401 host->heads * host->sectors;
402 host->n_sectors -= host->nres_sectors;
403 }
404
405 mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
406 mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
407 mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
408 printk(KERN_INFO "mg_disk: model: %s\n", model);
409 printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
410 printk(KERN_INFO "mg_disk: serial: %s\n", serial);
411 printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
412 host->n_sectors, host->nres_sectors);
413
414 if (!prv_data->use_polling)
415 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
416
417 return err;
418 }
419
420
421 static int mg_disk_init(struct mg_host *host)
422 {
423 struct mg_drv_data *prv_data = host->dev->platform_data;
424 s32 err;
425 u8 init_status;
426
427 /* hdd rst low */
428 gpio_set_value(host->rst, 0);
429 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
430 if (err)
431 return err;
432
433 /* hdd rst high */
434 gpio_set_value(host->rst, 1);
435 err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
436 if (err)
437 return err;
438
439 /* soft reset on */
440 outb(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0),
441 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
442 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
443 if (err)
444 return err;
445
446 /* soft reset off */
447 outb(prv_data->use_polling ? ATA_NIEN : 0,
448 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
449 err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
450 if (err)
451 return err;
452
453 init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
454
455 if (init_status == 0xf)
456 return MG_ERR_INIT_STAT;
457
458 return err;
459 }
460
461 static void mg_bad_rw_intr(struct mg_host *host)
462 {
463 if (host->req)
464 if (++host->req->errors >= MG_MAX_ERRORS ||
465 host->error == MG_ERR_TIMEOUT)
466 mg_end_request_cur(host, -EIO);
467 }
468
469 static unsigned int mg_out(struct mg_host *host,
470 unsigned int sect_num,
471 unsigned int sect_cnt,
472 unsigned int cmd,
473 void (*intr_addr)(struct mg_host *))
474 {
475 struct mg_drv_data *prv_data = host->dev->platform_data;
476
477 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
478 return host->error;
479
480 if (!prv_data->use_polling) {
481 host->mg_do_intr = intr_addr;
482 mod_timer(&host->timer, jiffies + 3 * HZ);
483 }
484 if (MG_RES_SEC)
485 sect_num += MG_RES_SEC;
486 outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
487 outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
488 outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
489 MG_REG_CYL_LOW);
490 outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
491 MG_REG_CYL_HIGH);
492 outb((u8)((sect_num >> 24) | ATA_LBA | ATA_DEVICE_OBS),
493 (unsigned long)host->dev_base + MG_REG_DRV_HEAD);
494 outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
495 return MG_ERR_NONE;
496 }
497
498 static void mg_read(struct request *req)
499 {
500 u32 j;
501 struct mg_host *host = req->rq_disk->private_data;
502
503 if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
504 MG_CMD_RD, NULL) != MG_ERR_NONE)
505 mg_bad_rw_intr(host);
506
507 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
508 blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
509
510 do {
511 u16 *buff = (u16 *)req->buffer;
512
513 if (mg_wait(host, ATA_DRQ,
514 MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
515 mg_bad_rw_intr(host);
516 return;
517 }
518 for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
519 *buff++ = inw((unsigned long)host->dev_base +
520 MG_BUFF_OFFSET + (j << 1));
521
522 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
523 MG_REG_COMMAND);
524 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
525 }
526
527 static void mg_write(struct request *req)
528 {
529 u32 j;
530 struct mg_host *host = req->rq_disk->private_data;
531
532 if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
533 MG_CMD_WR, NULL) != MG_ERR_NONE) {
534 mg_bad_rw_intr(host);
535 return;
536 }
537
538 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
539 blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
540
541 do {
542 u16 *buff = (u16 *)req->buffer;
543
544 if (mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
545 mg_bad_rw_intr(host);
546 return;
547 }
548 for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
549 outw(*buff++, (unsigned long)host->dev_base +
550 MG_BUFF_OFFSET + (j << 1));
551
552 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
553 MG_REG_COMMAND);
554 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
555 }
556
557 static void mg_read_intr(struct mg_host *host)
558 {
559 struct request *req = host->req;
560 u32 i;
561 u16 *buff;
562
563 /* check status */
564 do {
565 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
566 if (i & ATA_BUSY)
567 break;
568 if (!MG_READY_OK(i))
569 break;
570 if (i & ATA_DRQ)
571 goto ok_to_read;
572 } while (0);
573 mg_dump_status("mg_read_intr", i, host);
574 mg_bad_rw_intr(host);
575 mg_request(host->breq);
576 return;
577
578 ok_to_read:
579 /* get current segment of request */
580 buff = (u16 *)req->buffer;
581
582 /* read 1 sector */
583 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
584 *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
585 (i << 1));
586
587 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
588 blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
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, j;
605 u16 *buff;
606 bool rem;
607
608 /* check status */
609 do {
610 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
611 if (i & ATA_BUSY)
612 break;
613 if (!MG_READY_OK(i))
614 break;
615 if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
616 goto ok_to_write;
617 } while (0);
618 mg_dump_status("mg_write_intr", i, host);
619 mg_bad_rw_intr(host);
620 mg_request(host->breq);
621 return;
622
623 ok_to_write:
624 if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
625 /* write 1 sector and set handler if remains */
626 buff = (u16 *)req->buffer;
627 for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) {
628 outw(*buff, (unsigned long)host->dev_base +
629 MG_BUFF_OFFSET + (j << 1));
630 buff++;
631 }
632 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
633 blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
634 host->mg_do_intr = mg_write_intr;
635 mod_timer(&host->timer, jiffies + 3 * HZ);
636 }
637
638 /* send write confirm */
639 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
640
641 if (!rem)
642 mg_request(host->breq);
643 }
644
645 void mg_times_out(unsigned long data)
646 {
647 struct mg_host *host = (struct mg_host *)data;
648 char *name;
649
650 spin_lock_irq(&host->lock);
651
652 if (!host->req)
653 goto out_unlock;
654
655 host->mg_do_intr = NULL;
656
657 name = host->req->rq_disk->disk_name;
658 printk(KERN_DEBUG "%s: timeout\n", name);
659
660 host->error = MG_ERR_TIMEOUT;
661 mg_bad_rw_intr(host);
662
663 out_unlock:
664 mg_request(host->breq);
665 spin_unlock_irq(&host->lock);
666 }
667
668 static void mg_request_poll(struct request_queue *q)
669 {
670 struct mg_host *host = q->queuedata;
671
672 while (1) {
673 if (!host->req) {
674 host->req = blk_fetch_request(q);
675 if (!host->req)
676 break;
677 }
678
679 if (unlikely(!blk_fs_request(host->req))) {
680 mg_end_request_cur(host, -EIO);
681 continue;
682 }
683
684 if (rq_data_dir(host->req) == READ)
685 mg_read(host->req);
686 else
687 mg_write(host->req);
688 }
689 }
690
691 static unsigned int mg_issue_req(struct request *req,
692 struct mg_host *host,
693 unsigned int sect_num,
694 unsigned int sect_cnt)
695 {
696 u16 *buff;
697 u32 i;
698
699 switch (rq_data_dir(req)) {
700 case READ:
701 if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
702 != MG_ERR_NONE) {
703 mg_bad_rw_intr(host);
704 return host->error;
705 }
706 break;
707 case WRITE:
708 /* TODO : handler */
709 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
710 if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
711 != MG_ERR_NONE) {
712 mg_bad_rw_intr(host);
713 return host->error;
714 }
715 del_timer(&host->timer);
716 mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
717 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
718 if (host->error) {
719 mg_bad_rw_intr(host);
720 return host->error;
721 }
722 buff = (u16 *)req->buffer;
723 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
724 outw(*buff, (unsigned long)host->dev_base +
725 MG_BUFF_OFFSET + (i << 1));
726 buff++;
727 }
728 mod_timer(&host->timer, jiffies + 3 * HZ);
729 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
730 MG_REG_COMMAND);
731 break;
732 }
733 return MG_ERR_NONE;
734 }
735
736 /* This function also called from IRQ context */
737 static void mg_request(struct request_queue *q)
738 {
739 struct mg_host *host = q->queuedata;
740 struct request *req;
741 u32 sect_num, sect_cnt;
742
743 while (1) {
744 if (!host->req) {
745 host->req = blk_fetch_request(q);
746 if (!host->req)
747 break;
748 }
749 req = host->req;
750
751 /* check unwanted request call */
752 if (host->mg_do_intr)
753 return;
754
755 del_timer(&host->timer);
756
757 sect_num = blk_rq_pos(req);
758 /* deal whole segments */
759 sect_cnt = blk_rq_sectors(req);
760
761 /* sanity check */
762 if (sect_num >= get_capacity(req->rq_disk) ||
763 ((sect_num + sect_cnt) >
764 get_capacity(req->rq_disk))) {
765 printk(KERN_WARNING
766 "%s: bad access: sector=%d, count=%d\n",
767 req->rq_disk->disk_name,
768 sect_num, sect_cnt);
769 mg_end_request_cur(host, -EIO);
770 continue;
771 }
772
773 if (unlikely(!blk_fs_request(req))) {
774 mg_end_request_cur(host, -EIO);
775 continue;
776 }
777
778 if (!mg_issue_req(req, host, sect_num, sect_cnt))
779 return;
780 }
781 }
782
783 static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
784 {
785 struct mg_host *host = bdev->bd_disk->private_data;
786
787 geo->cylinders = (unsigned short)host->cyls;
788 geo->heads = (unsigned char)host->heads;
789 geo->sectors = (unsigned char)host->sectors;
790 return 0;
791 }
792
793 static struct block_device_operations mg_disk_ops = {
794 .getgeo = mg_getgeo
795 };
796
797 static int mg_suspend(struct platform_device *plat_dev, pm_message_t state)
798 {
799 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
800 struct mg_host *host = prv_data->host;
801
802 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
803 return -EIO;
804
805 if (!prv_data->use_polling)
806 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
807
808 outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
809 /* wait until mflash deep sleep */
810 msleep(1);
811
812 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
813 if (!prv_data->use_polling)
814 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
815 return -EIO;
816 }
817
818 return 0;
819 }
820
821 static int mg_resume(struct platform_device *plat_dev)
822 {
823 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
824 struct mg_host *host = prv_data->host;
825
826 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
827 return -EIO;
828
829 outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
830 /* wait until mflash wakeup */
831 msleep(1);
832
833 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
834 return -EIO;
835
836 if (!prv_data->use_polling)
837 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
838
839 return 0;
840 }
841
842 static int mg_probe(struct platform_device *plat_dev)
843 {
844 struct mg_host *host;
845 struct resource *rsc;
846 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
847 int err = 0;
848
849 if (!prv_data) {
850 printk(KERN_ERR "%s:%d fail (no driver_data)\n",
851 __func__, __LINE__);
852 err = -EINVAL;
853 goto probe_err;
854 }
855
856 /* alloc mg_host */
857 host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
858 if (!host) {
859 printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
860 __func__, __LINE__);
861 err = -ENOMEM;
862 goto probe_err;
863 }
864 host->major = MG_DISK_MAJ;
865
866 /* link each other */
867 prv_data->host = host;
868 host->dev = &plat_dev->dev;
869
870 /* io remap */
871 rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
872 if (!rsc) {
873 printk(KERN_ERR "%s:%d platform_get_resource fail\n",
874 __func__, __LINE__);
875 err = -EINVAL;
876 goto probe_err_2;
877 }
878 host->dev_base = ioremap(rsc->start , rsc->end + 1);
879 if (!host->dev_base) {
880 printk(KERN_ERR "%s:%d ioremap fail\n",
881 __func__, __LINE__);
882 err = -EIO;
883 goto probe_err_2;
884 }
885 MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
886
887 /* get reset pin */
888 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
889 MG_RST_PIN);
890 if (!rsc) {
891 printk(KERN_ERR "%s:%d get reset pin fail\n",
892 __func__, __LINE__);
893 err = -EIO;
894 goto probe_err_3;
895 }
896 host->rst = rsc->start;
897
898 /* init rst pin */
899 err = gpio_request(host->rst, MG_RST_PIN);
900 if (err)
901 goto probe_err_3;
902 gpio_direction_output(host->rst, 1);
903
904 /* reset out pin */
905 if (!(prv_data->dev_attr & MG_DEV_MASK))
906 goto probe_err_3a;
907
908 if (prv_data->dev_attr != MG_BOOT_DEV) {
909 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
910 MG_RSTOUT_PIN);
911 if (!rsc) {
912 printk(KERN_ERR "%s:%d get reset-out pin fail\n",
913 __func__, __LINE__);
914 err = -EIO;
915 goto probe_err_3a;
916 }
917 host->rstout = rsc->start;
918 err = gpio_request(host->rstout, MG_RSTOUT_PIN);
919 if (err)
920 goto probe_err_3a;
921 gpio_direction_input(host->rstout);
922 }
923
924 /* disk reset */
925 if (prv_data->dev_attr == MG_STORAGE_DEV) {
926 /* If POR seq. not yet finised, wait */
927 err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
928 if (err)
929 goto probe_err_3b;
930 err = mg_disk_init(host);
931 if (err) {
932 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
933 __func__, __LINE__, err);
934 err = -EIO;
935 goto probe_err_3b;
936 }
937 }
938
939 /* get irq resource */
940 if (!prv_data->use_polling) {
941 host->irq = platform_get_irq(plat_dev, 0);
942 if (host->irq == -ENXIO) {
943 err = host->irq;
944 goto probe_err_3b;
945 }
946 err = request_irq(host->irq, mg_irq,
947 IRQF_DISABLED | IRQF_TRIGGER_RISING,
948 MG_DEV_NAME, host);
949 if (err) {
950 printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
951 __func__, __LINE__, err);
952 goto probe_err_3b;
953 }
954
955 }
956
957 /* get disk id */
958 err = mg_get_disk_id(host);
959 if (err) {
960 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
961 __func__, __LINE__, err);
962 err = -EIO;
963 goto probe_err_4;
964 }
965
966 err = register_blkdev(host->major, MG_DISK_NAME);
967 if (err < 0) {
968 printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
969 __func__, __LINE__, err);
970 goto probe_err_4;
971 }
972 if (!host->major)
973 host->major = err;
974
975 spin_lock_init(&host->lock);
976
977 if (prv_data->use_polling)
978 host->breq = blk_init_queue(mg_request_poll, &host->lock);
979 else
980 host->breq = blk_init_queue(mg_request, &host->lock);
981
982 if (!host->breq) {
983 err = -ENOMEM;
984 printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
985 __func__, __LINE__);
986 goto probe_err_5;
987 }
988 host->breq->queuedata = host;
989
990 /* mflash is random device, thanx for the noop */
991 elevator_exit(host->breq->elevator);
992 err = elevator_init(host->breq, "noop");
993 if (err) {
994 printk(KERN_ERR "%s:%d (elevator_init) fail\n",
995 __func__, __LINE__);
996 goto probe_err_6;
997 }
998 blk_queue_max_sectors(host->breq, MG_MAX_SECTS);
999 blk_queue_hardsect_size(host->breq, MG_SECTOR_SIZE);
1000
1001 init_timer(&host->timer);
1002 host->timer.function = mg_times_out;
1003 host->timer.data = (unsigned long)host;
1004
1005 host->gd = alloc_disk(MG_DISK_MAX_PART);
1006 if (!host->gd) {
1007 printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
1008 __func__, __LINE__);
1009 err = -ENOMEM;
1010 goto probe_err_7;
1011 }
1012 host->gd->major = host->major;
1013 host->gd->first_minor = 0;
1014 host->gd->fops = &mg_disk_ops;
1015 host->gd->queue = host->breq;
1016 host->gd->private_data = host;
1017 sprintf(host->gd->disk_name, MG_DISK_NAME"a");
1018
1019 set_capacity(host->gd, host->n_sectors);
1020
1021 add_disk(host->gd);
1022
1023 return err;
1024
1025 probe_err_7:
1026 del_timer_sync(&host->timer);
1027 probe_err_6:
1028 blk_cleanup_queue(host->breq);
1029 probe_err_5:
1030 unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
1031 probe_err_4:
1032 if (!prv_data->use_polling)
1033 free_irq(host->irq, host);
1034 probe_err_3b:
1035 gpio_free(host->rstout);
1036 probe_err_3a:
1037 gpio_free(host->rst);
1038 probe_err_3:
1039 iounmap(host->dev_base);
1040 probe_err_2:
1041 kfree(host);
1042 probe_err:
1043 return err;
1044 }
1045
1046 static int mg_remove(struct platform_device *plat_dev)
1047 {
1048 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
1049 struct mg_host *host = prv_data->host;
1050 int err = 0;
1051
1052 /* delete timer */
1053 del_timer_sync(&host->timer);
1054
1055 /* remove disk */
1056 if (host->gd) {
1057 del_gendisk(host->gd);
1058 put_disk(host->gd);
1059 }
1060 /* remove queue */
1061 if (host->breq)
1062 blk_cleanup_queue(host->breq);
1063
1064 /* unregister blk device */
1065 unregister_blkdev(host->major, MG_DISK_NAME);
1066
1067 /* free irq */
1068 if (!prv_data->use_polling)
1069 free_irq(host->irq, host);
1070
1071 /* free reset-out pin */
1072 if (prv_data->dev_attr != MG_BOOT_DEV)
1073 gpio_free(host->rstout);
1074
1075 /* free rst pin */
1076 if (host->rst)
1077 gpio_free(host->rst);
1078
1079 /* unmap io */
1080 if (host->dev_base)
1081 iounmap(host->dev_base);
1082
1083 /* free mg_host */
1084 kfree(host);
1085
1086 return err;
1087 }
1088
1089 static struct platform_driver mg_disk_driver = {
1090 .probe = mg_probe,
1091 .remove = mg_remove,
1092 .suspend = mg_suspend,
1093 .resume = mg_resume,
1094 .driver = {
1095 .name = MG_DEV_NAME,
1096 .owner = THIS_MODULE,
1097 }
1098 };
1099
1100 /****************************************************************************
1101 *
1102 * Module stuff
1103 *
1104 ****************************************************************************/
1105
1106 static int __init mg_init(void)
1107 {
1108 printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1109 return platform_driver_register(&mg_disk_driver);
1110 }
1111
1112 static void __exit mg_exit(void)
1113 {
1114 printk(KERN_INFO "mflash driver : bye bye\n");
1115 platform_driver_unregister(&mg_disk_driver);
1116 }
1117
1118 module_init(mg_init);
1119 module_exit(mg_exit);
1120
1121 MODULE_LICENSE("GPL");
1122 MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1123 MODULE_DESCRIPTION("mGine m[g]flash device driver");
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