mflash: initial support
[linux-2.6.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/libata.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
27 #define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
28
29 static void mg_request(struct request_queue *);
30
31 static void mg_dump_status(const char *msg, unsigned int stat,
32                 struct mg_host *host)
33 {
34         char *name = MG_DISK_NAME;
35         struct request *req;
36
37         if (host->breq) {
38                 req = elv_next_request(host->breq);
39                 if (req)
40                         name = req->rq_disk->disk_name;
41         }
42
43         printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
44         if (stat & MG_REG_STATUS_BIT_BUSY)
45                 printk("Busy ");
46         if (stat & MG_REG_STATUS_BIT_READY)
47                 printk("DriveReady ");
48         if (stat & MG_REG_STATUS_BIT_WRITE_FAULT)
49                 printk("WriteFault ");
50         if (stat & MG_REG_STATUS_BIT_SEEK_DONE)
51                 printk("SeekComplete ");
52         if (stat & MG_REG_STATUS_BIT_DATA_REQ)
53                 printk("DataRequest ");
54         if (stat & MG_REG_STATUS_BIT_CORRECTED_ERROR)
55                 printk("CorrectedError ");
56         if (stat & MG_REG_STATUS_BIT_ERROR)
57                 printk("Error ");
58         printk("}\n");
59         if ((stat & MG_REG_STATUS_BIT_ERROR) == 0) {
60                 host->error = 0;
61         } else {
62                 host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
63                 printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
64                                 host->error & 0xff);
65                 if (host->error & MG_REG_ERR_BBK)
66                         printk("BadSector ");
67                 if (host->error & MG_REG_ERR_UNC)
68                         printk("UncorrectableError ");
69                 if (host->error & MG_REG_ERR_IDNF)
70                         printk("SectorIdNotFound ");
71                 if (host->error & MG_REG_ERR_ABRT)
72                         printk("DriveStatusError ");
73                 if (host->error & MG_REG_ERR_AMNF)
74                         printk("AddrMarkNotFound ");
75                 printk("}");
76                 if (host->error &
77                                 (MG_REG_ERR_BBK | MG_REG_ERR_UNC |
78                                  MG_REG_ERR_IDNF | MG_REG_ERR_AMNF)) {
79                         if (host->breq) {
80                                 req = elv_next_request(host->breq);
81                                 if (req)
82                                         printk(", sector=%ld", req->sector);
83                         }
84
85                 }
86                 printk("\n");
87         }
88 }
89
90 static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
91 {
92         u8 status;
93         unsigned long expire, cur_jiffies;
94         struct mg_drv_data *prv_data = host->dev->platform_data;
95
96         host->error = MG_ERR_NONE;
97         expire = jiffies + msecs_to_jiffies(msec);
98
99         status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
100
101         do {
102                 cur_jiffies = jiffies;
103                 if (status & MG_REG_STATUS_BIT_BUSY) {
104                         if (expect == MG_REG_STATUS_BIT_BUSY)
105                                 break;
106                 } else {
107                         /* Check the error condition! */
108                         if (status & MG_REG_STATUS_BIT_ERROR) {
109                                 mg_dump_status("mg_wait", status, host);
110                                 break;
111                         }
112
113                         if (expect == MG_STAT_READY)
114                                 if (MG_READY_OK(status))
115                                         break;
116
117                         if (expect == MG_REG_STATUS_BIT_DATA_REQ)
118                                 if (status & MG_REG_STATUS_BIT_DATA_REQ)
119                                         break;
120                 }
121                 if (!msec) {
122                         mg_dump_status("not ready", status, host);
123                         return MG_ERR_INV_STAT;
124                 }
125                 if (prv_data->use_polling)
126                         msleep(1);
127
128                 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
129         } while (time_before(cur_jiffies, expire));
130
131         if (time_after_eq(cur_jiffies, expire) && msec)
132                 host->error = MG_ERR_TIMEOUT;
133
134         return host->error;
135 }
136
137 static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
138 {
139         unsigned long expire;
140
141         expire = jiffies + msecs_to_jiffies(msec);
142         while (time_before(jiffies, expire)) {
143                 if (gpio_get_value(rstout) == 1)
144                         return MG_ERR_NONE;
145                 msleep(10);
146         }
147
148         return MG_ERR_RSTOUT;
149 }
150
151 static void mg_unexpected_intr(struct mg_host *host)
152 {
153         u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
154
155         mg_dump_status("mg_unexpected_intr", status, host);
156 }
157
158 static irqreturn_t mg_irq(int irq, void *dev_id)
159 {
160         struct mg_host *host = dev_id;
161         void (*handler)(struct mg_host *) = host->mg_do_intr;
162
163         host->mg_do_intr = 0;
164         del_timer(&host->timer);
165         if (!handler)
166                 handler = mg_unexpected_intr;
167         handler(host);
168         return IRQ_HANDLED;
169 }
170
171 static int mg_get_disk_id(struct mg_host *host)
172 {
173         u32 i;
174         s32 err;
175         const u16 *id = host->id;
176         struct mg_drv_data *prv_data = host->dev->platform_data;
177         char fwrev[ATA_ID_FW_REV_LEN + 1];
178         char model[ATA_ID_PROD_LEN + 1];
179         char serial[ATA_ID_SERNO_LEN + 1];
180
181         if (!prv_data->use_polling)
182                 outb(MG_REG_CTRL_INTR_DISABLE,
183                                 (unsigned long)host->dev_base +
184                                 MG_REG_DRV_CTRL);
185
186         outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
187         err = mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_RD_DRQ);
188         if (err)
189                 return err;
190
191         for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
192                 host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
193                                         MG_BUFF_OFFSET + i * 2));
194
195         outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
196         err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
197         if (err)
198                 return err;
199
200         if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
201                 return MG_ERR_TRANSLATION;
202
203         host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
204         host->cyls = id[ATA_ID_CYLS];
205         host->heads = id[ATA_ID_HEADS];
206         host->sectors = id[ATA_ID_SECTORS];
207
208         if (MG_RES_SEC && host->heads && host->sectors) {
209                 /* modify cyls, n_sectors */
210                 host->cyls = (host->n_sectors - MG_RES_SEC) /
211                         host->heads / host->sectors;
212                 host->nres_sectors = host->n_sectors - host->cyls *
213                         host->heads * host->sectors;
214                 host->n_sectors -= host->nres_sectors;
215         }
216
217         ata_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
218         ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
219         ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
220         printk(KERN_INFO "mg_disk: model: %s\n", model);
221         printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
222         printk(KERN_INFO "mg_disk: serial: %s\n", serial);
223         printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
224                         host->n_sectors, host->nres_sectors);
225
226         if (!prv_data->use_polling)
227                 outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base +
228                                 MG_REG_DRV_CTRL);
229
230         return err;
231 }
232
233
234 static int mg_disk_init(struct mg_host *host)
235 {
236         struct mg_drv_data *prv_data = host->dev->platform_data;
237         s32 err;
238         u8 init_status;
239
240         /* hdd rst low */
241         gpio_set_value(host->rst, 0);
242         err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY);
243         if (err)
244                 return err;
245
246         /* hdd rst high */
247         gpio_set_value(host->rst, 1);
248         err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
249         if (err)
250                 return err;
251
252         /* soft reset on */
253         outb(MG_REG_CTRL_RESET |
254                         (prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE :
255                          MG_REG_CTRL_INTR_ENABLE),
256                         (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
257         err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY);
258         if (err)
259                 return err;
260
261         /* soft reset off */
262         outb(prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE :
263                         MG_REG_CTRL_INTR_ENABLE,
264                         (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
265         err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
266         if (err)
267                 return err;
268
269         init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
270
271         if (init_status == 0xf)
272                 return MG_ERR_INIT_STAT;
273
274         return err;
275 }
276
277 static void mg_bad_rw_intr(struct mg_host *host)
278 {
279         struct request *req = elv_next_request(host->breq);
280         if (req != NULL)
281                 if (++req->errors >= MG_MAX_ERRORS ||
282                                 host->error == MG_ERR_TIMEOUT)
283                         end_request(req, 0);
284 }
285
286 static unsigned int mg_out(struct mg_host *host,
287                 unsigned int sect_num,
288                 unsigned int sect_cnt,
289                 unsigned int cmd,
290                 void (*intr_addr)(struct mg_host *))
291 {
292         struct mg_drv_data *prv_data = host->dev->platform_data;
293
294         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
295                 return host->error;
296
297         if (!prv_data->use_polling) {
298                 host->mg_do_intr = intr_addr;
299                 mod_timer(&host->timer, jiffies + 3 * HZ);
300         }
301         if (MG_RES_SEC)
302                 sect_num += MG_RES_SEC;
303         outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
304         outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
305         outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
306                         MG_REG_CYL_LOW);
307         outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
308                         MG_REG_CYL_HIGH);
309         outb((u8)((sect_num >> 24) | MG_REG_HEAD_LBA_MODE),
310                         (unsigned long)host->dev_base + MG_REG_DRV_HEAD);
311         outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
312         return MG_ERR_NONE;
313 }
314
315 static void mg_read(struct request *req)
316 {
317         u32 remains, j;
318         struct mg_host *host = req->rq_disk->private_data;
319
320         remains = req->nr_sectors;
321
322         if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, 0) !=
323                         MG_ERR_NONE)
324                 mg_bad_rw_intr(host);
325
326         MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
327                         remains, req->sector, req->buffer);
328
329         while (remains) {
330                 if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ,
331                                         MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
332                         mg_bad_rw_intr(host);
333                         return;
334                 }
335                 for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
336                         *(u16 *)req->buffer =
337                                 inw((unsigned long)host->dev_base +
338                                                 MG_BUFF_OFFSET + (j << 1));
339                         req->buffer += 2;
340                 }
341
342                 req->sector++;
343                 req->errors = 0;
344                 remains = --req->nr_sectors;
345                 --req->current_nr_sectors;
346
347                 if (req->current_nr_sectors <= 0) {
348                         MG_DBG("remain : %d sects\n", remains);
349                         end_request(req, 1);
350                         if (remains > 0)
351                                 req = elv_next_request(host->breq);
352                 }
353
354                 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
355                                 MG_REG_COMMAND);
356         }
357 }
358
359 static void mg_write(struct request *req)
360 {
361         u32 remains, j;
362         struct mg_host *host = req->rq_disk->private_data;
363
364         remains = req->nr_sectors;
365
366         if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, 0) !=
367                         MG_ERR_NONE) {
368                 mg_bad_rw_intr(host);
369                 return;
370         }
371
372
373         MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
374                         remains, req->sector, req->buffer);
375         while (remains) {
376                 if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ,
377                                         MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
378                         mg_bad_rw_intr(host);
379                         return;
380                 }
381                 for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
382                         outw(*(u16 *)req->buffer,
383                                         (unsigned long)host->dev_base +
384                                         MG_BUFF_OFFSET + (j << 1));
385                         req->buffer += 2;
386                 }
387                 req->sector++;
388                 remains = --req->nr_sectors;
389                 --req->current_nr_sectors;
390
391                 if (req->current_nr_sectors <= 0) {
392                         MG_DBG("remain : %d sects\n", remains);
393                         end_request(req, 1);
394                         if (remains > 0)
395                                 req = elv_next_request(host->breq);
396                 }
397
398                 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
399                                 MG_REG_COMMAND);
400         }
401 }
402
403 static void mg_read_intr(struct mg_host *host)
404 {
405         u32 i;
406         struct request *req;
407
408         /* check status */
409         do {
410                 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
411                 if (i & MG_REG_STATUS_BIT_BUSY)
412                         break;
413                 if (!MG_READY_OK(i))
414                         break;
415                 if (i & MG_REG_STATUS_BIT_DATA_REQ)
416                         goto ok_to_read;
417         } while (0);
418         mg_dump_status("mg_read_intr", i, host);
419         mg_bad_rw_intr(host);
420         mg_request(host->breq);
421         return;
422
423 ok_to_read:
424         /* get current segment of request */
425         req = elv_next_request(host->breq);
426
427         /* read 1 sector */
428         for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
429                 *(u16 *)req->buffer =
430                         inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
431                                         (i << 1));
432                 req->buffer += 2;
433         }
434
435         /* manipulate request */
436         MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
437                         req->sector, req->nr_sectors - 1, req->buffer);
438
439         req->sector++;
440         req->errors = 0;
441         i = --req->nr_sectors;
442         --req->current_nr_sectors;
443
444         /* let know if current segment done */
445         if (req->current_nr_sectors <= 0)
446                 end_request(req, 1);
447
448         /* set handler if read remains */
449         if (i > 0) {
450                 host->mg_do_intr = mg_read_intr;
451                 mod_timer(&host->timer, jiffies + 3 * HZ);
452         }
453
454         /* send read confirm */
455         outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
456
457         /* goto next request */
458         if (!i)
459                 mg_request(host->breq);
460 }
461
462 static void mg_write_intr(struct mg_host *host)
463 {
464         u32 i, j;
465         u16 *buff;
466         struct request *req;
467
468         /* get current segment of request */
469         req = elv_next_request(host->breq);
470
471         /* check status */
472         do {
473                 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
474                 if (i & MG_REG_STATUS_BIT_BUSY)
475                         break;
476                 if (!MG_READY_OK(i))
477                         break;
478                 if ((req->nr_sectors <= 1) || (i & MG_REG_STATUS_BIT_DATA_REQ))
479                         goto ok_to_write;
480         } while (0);
481         mg_dump_status("mg_write_intr", i, host);
482         mg_bad_rw_intr(host);
483         mg_request(host->breq);
484         return;
485
486 ok_to_write:
487         /* manipulate request */
488         req->sector++;
489         i = --req->nr_sectors;
490         --req->current_nr_sectors;
491         req->buffer += MG_SECTOR_SIZE;
492
493         /* let know if current segment or all done */
494         if (!i || (req->bio && req->current_nr_sectors <= 0))
495                 end_request(req, 1);
496
497         /* write 1 sector and set handler if remains */
498         if (i > 0) {
499                 buff = (u16 *)req->buffer;
500                 for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) {
501                         outw(*buff, (unsigned long)host->dev_base +
502                                         MG_BUFF_OFFSET + (j << 1));
503                         buff++;
504                 }
505                 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
506                                 req->sector, req->nr_sectors, req->buffer);
507                 host->mg_do_intr = mg_write_intr;
508                 mod_timer(&host->timer, jiffies + 3 * HZ);
509         }
510
511         /* send write confirm */
512         outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
513
514         if (!i)
515                 mg_request(host->breq);
516 }
517
518 void mg_times_out(unsigned long data)
519 {
520         struct mg_host *host = (struct mg_host *)data;
521         char *name;
522         struct request *req;
523
524         req = elv_next_request(host->breq);
525         if (!req)
526                 return;
527
528         host->mg_do_intr = NULL;
529
530         name = req->rq_disk->disk_name;
531         printk(KERN_DEBUG "%s: timeout\n", name);
532
533         host->error = MG_ERR_TIMEOUT;
534         mg_bad_rw_intr(host);
535
536         mg_request(host->breq);
537 }
538
539 static void mg_request_poll(struct request_queue *q)
540 {
541         struct request *req;
542         struct mg_host *host;
543
544         while ((req = elv_next_request(q)) != NULL) {
545                 host = req->rq_disk->private_data;
546                 if (blk_fs_request(req)) {
547                         switch (rq_data_dir(req)) {
548                         case READ:
549                                 mg_read(req);
550                                 break;
551                         case WRITE:
552                                 mg_write(req);
553                                 break;
554                         default:
555                                 printk(KERN_WARNING "%s:%d unknown command\n",
556                                                 __func__, __LINE__);
557                                 end_request(req, 0);
558                                 break;
559                         }
560                 }
561         }
562 }
563
564 static unsigned int mg_issue_req(struct request *req,
565                 struct mg_host *host,
566                 unsigned int sect_num,
567                 unsigned int sect_cnt)
568 {
569         u16 *buff;
570         u32 i;
571
572         switch (rq_data_dir(req)) {
573         case READ:
574                 if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
575                                 != MG_ERR_NONE) {
576                         mg_bad_rw_intr(host);
577                         return host->error;
578                 }
579                 break;
580         case WRITE:
581                 /* TODO : handler */
582                 outb(MG_REG_CTRL_INTR_DISABLE,
583                                 (unsigned long)host->dev_base +
584                                 MG_REG_DRV_CTRL);
585                 if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
586                                 != MG_ERR_NONE) {
587                         mg_bad_rw_intr(host);
588                         return host->error;
589                 }
590                 del_timer(&host->timer);
591                 mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_WR_DRQ);
592                 outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base +
593                                 MG_REG_DRV_CTRL);
594                 if (host->error) {
595                         mg_bad_rw_intr(host);
596                         return host->error;
597                 }
598                 buff = (u16 *)req->buffer;
599                 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
600                         outw(*buff, (unsigned long)host->dev_base +
601                                         MG_BUFF_OFFSET + (i << 1));
602                         buff++;
603                 }
604                 mod_timer(&host->timer, jiffies + 3 * HZ);
605                 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
606                                 MG_REG_COMMAND);
607                 break;
608         default:
609                 printk(KERN_WARNING "%s:%d unknown command\n",
610                                 __func__, __LINE__);
611                 end_request(req, 0);
612                 break;
613         }
614         return MG_ERR_NONE;
615 }
616
617 /* This function also called from IRQ context */
618 static void mg_request(struct request_queue *q)
619 {
620         struct request *req;
621         struct mg_host *host;
622         u32 sect_num, sect_cnt;
623
624         while (1) {
625                 req = elv_next_request(q);
626                 if (!req)
627                         return;
628
629                 host = req->rq_disk->private_data;
630
631                 /* check unwanted request call */
632                 if (host->mg_do_intr)
633                         return;
634
635                 del_timer(&host->timer);
636
637                 sect_num = req->sector;
638                 /* deal whole segments */
639                 sect_cnt = req->nr_sectors;
640
641                 /* sanity check */
642                 if (sect_num >= get_capacity(req->rq_disk) ||
643                                 ((sect_num + sect_cnt) >
644                                  get_capacity(req->rq_disk))) {
645                         printk(KERN_WARNING
646                                         "%s: bad access: sector=%d, count=%d\n",
647                                         req->rq_disk->disk_name,
648                                         sect_num, sect_cnt);
649                         end_request(req, 0);
650                         continue;
651                 }
652
653                 if (!blk_fs_request(req))
654                         return;
655
656                 if (!mg_issue_req(req, host, sect_num, sect_cnt))
657                         return;
658         }
659 }
660
661 static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
662 {
663         struct mg_host *host = bdev->bd_disk->private_data;
664
665         geo->cylinders = (unsigned short)host->cyls;
666         geo->heads = (unsigned char)host->heads;
667         geo->sectors = (unsigned char)host->sectors;
668         return 0;
669 }
670
671 static struct block_device_operations mg_disk_ops = {
672         .getgeo = mg_getgeo
673 };
674
675 static int mg_suspend(struct platform_device *plat_dev, pm_message_t state)
676 {
677         struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
678         struct mg_host *host = prv_data->host;
679
680         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
681                 return -EIO;
682
683         if (!prv_data->use_polling)
684                 outb(MG_REG_CTRL_INTR_DISABLE,
685                                 (unsigned long)host->dev_base +
686                                 MG_REG_DRV_CTRL);
687
688         outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
689         /* wait until mflash deep sleep */
690         msleep(1);
691
692         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
693                 if (!prv_data->use_polling)
694                         outb(MG_REG_CTRL_INTR_ENABLE,
695                                         (unsigned long)host->dev_base +
696                                         MG_REG_DRV_CTRL);
697                 return -EIO;
698         }
699
700         return 0;
701 }
702
703 static int mg_resume(struct platform_device *plat_dev)
704 {
705         struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
706         struct mg_host *host = prv_data->host;
707
708         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
709                 return -EIO;
710
711         outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
712         /* wait until mflash wakeup */
713         msleep(1);
714
715         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
716                 return -EIO;
717
718         if (!prv_data->use_polling)
719                 outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base +
720                                 MG_REG_DRV_CTRL);
721
722         return 0;
723 }
724
725 static int mg_probe(struct platform_device *plat_dev)
726 {
727         struct mg_host *host;
728         struct resource *rsc;
729         struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
730         int err = 0;
731
732         if (!prv_data) {
733                 printk(KERN_ERR "%s:%d fail (no driver_data)\n",
734                                 __func__, __LINE__);
735                 err = -EINVAL;
736                 goto probe_err;
737         }
738
739         /* alloc mg_host */
740         host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
741         if (!host) {
742                 printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
743                                 __func__, __LINE__);
744                 err = -ENOMEM;
745                 goto probe_err;
746         }
747         host->major = MG_DISK_MAJ;
748
749         /* link each other */
750         prv_data->host = host;
751         host->dev = &plat_dev->dev;
752
753         /* io remap */
754         rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
755         if (!rsc) {
756                 printk(KERN_ERR "%s:%d platform_get_resource fail\n",
757                                 __func__, __LINE__);
758                 err = -EINVAL;
759                 goto probe_err_2;
760         }
761         host->dev_base = ioremap(rsc->start , rsc->end + 1);
762         if (!host->dev_base) {
763                 printk(KERN_ERR "%s:%d ioremap fail\n",
764                                 __func__, __LINE__);
765                 err = -EIO;
766                 goto probe_err_2;
767         }
768         MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
769
770         /* get reset pin */
771         rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
772                         MG_RST_PIN);
773         if (!rsc) {
774                 printk(KERN_ERR "%s:%d get reset pin fail\n",
775                                 __func__, __LINE__);
776                 err = -EIO;
777                 goto probe_err_3;
778         }
779         host->rst = rsc->start;
780
781         /* init rst pin */
782         err = gpio_request(host->rst, MG_RST_PIN);
783         if (err)
784                 goto probe_err_3;
785         gpio_direction_output(host->rst, 1);
786
787         /* reset out pin */
788         if (!(prv_data->dev_attr & MG_DEV_MASK))
789                 goto probe_err_3a;
790
791         if (prv_data->dev_attr != MG_BOOT_DEV) {
792                 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
793                                 MG_RSTOUT_PIN);
794                 if (!rsc) {
795                         printk(KERN_ERR "%s:%d get reset-out pin fail\n",
796                                         __func__, __LINE__);
797                         err = -EIO;
798                         goto probe_err_3a;
799                 }
800                 host->rstout = rsc->start;
801                 err = gpio_request(host->rstout, MG_RSTOUT_PIN);
802                 if (err)
803                         goto probe_err_3a;
804                 gpio_direction_input(host->rstout);
805         }
806
807         /* disk reset */
808         if (prv_data->dev_attr == MG_STORAGE_DEV) {
809                 /* If POR seq. not yet finised, wait */
810                 err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
811                 if (err)
812                         goto probe_err_3b;
813                 err = mg_disk_init(host);
814                 if (err) {
815                         printk(KERN_ERR "%s:%d fail (err code : %d)\n",
816                                         __func__, __LINE__, err);
817                         err = -EIO;
818                         goto probe_err_3b;
819                 }
820         }
821
822         /* get irq resource */
823         if (!prv_data->use_polling) {
824                 host->irq = platform_get_irq(plat_dev, 0);
825                 if (host->irq == -ENXIO) {
826                         err = host->irq;
827                         goto probe_err_3b;
828                 }
829                 err = request_irq(host->irq, mg_irq,
830                                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
831                                 MG_DEV_NAME, host);
832                 if (err) {
833                         printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
834                                         __func__, __LINE__, err);
835                         goto probe_err_3b;
836                 }
837
838         }
839
840         /* get disk id */
841         err = mg_get_disk_id(host);
842         if (err) {
843                 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
844                                 __func__, __LINE__, err);
845                 err = -EIO;
846                 goto probe_err_4;
847         }
848
849         err = register_blkdev(host->major, MG_DISK_NAME);
850         if (err < 0) {
851                 printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
852                                 __func__, __LINE__, err);
853                 goto probe_err_4;
854         }
855         if (!host->major)
856                 host->major = err;
857
858         spin_lock_init(&host->lock);
859
860         if (prv_data->use_polling)
861                 host->breq = blk_init_queue(mg_request_poll, &host->lock);
862         else
863                 host->breq = blk_init_queue(mg_request, &host->lock);
864
865         if (!host->breq) {
866                 err = -ENOMEM;
867                 printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
868                                 __func__, __LINE__);
869                 goto probe_err_5;
870         }
871
872         /* mflash is random device, thanx for the noop */
873         elevator_exit(host->breq->elevator);
874         err = elevator_init(host->breq, "noop");
875         if (err) {
876                 printk(KERN_ERR "%s:%d (elevator_init) fail\n",
877                                 __func__, __LINE__);
878                 goto probe_err_6;
879         }
880         blk_queue_max_sectors(host->breq, MG_MAX_SECTS);
881         blk_queue_hardsect_size(host->breq, MG_SECTOR_SIZE);
882
883         init_timer(&host->timer);
884         host->timer.function = mg_times_out;
885         host->timer.data = (unsigned long)host;
886
887         host->gd = alloc_disk(MG_DISK_MAX_PART);
888         if (!host->gd) {
889                 printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
890                                 __func__, __LINE__);
891                 err = -ENOMEM;
892                 goto probe_err_7;
893         }
894         host->gd->major = host->major;
895         host->gd->first_minor = 0;
896         host->gd->fops = &mg_disk_ops;
897         host->gd->queue = host->breq;
898         host->gd->private_data = host;
899         sprintf(host->gd->disk_name, MG_DISK_NAME"a");
900
901         set_capacity(host->gd, host->n_sectors);
902
903         add_disk(host->gd);
904
905         return err;
906
907 probe_err_7:
908         del_timer_sync(&host->timer);
909 probe_err_6:
910         blk_cleanup_queue(host->breq);
911 probe_err_5:
912         unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
913 probe_err_4:
914         if (!prv_data->use_polling)
915                 free_irq(host->irq, host);
916 probe_err_3b:
917         gpio_free(host->rstout);
918 probe_err_3a:
919         gpio_free(host->rst);
920 probe_err_3:
921         iounmap(host->dev_base);
922 probe_err_2:
923         kfree(host);
924 probe_err:
925         return err;
926 }
927
928 static int mg_remove(struct platform_device *plat_dev)
929 {
930         struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
931         struct mg_host *host = prv_data->host;
932         int err = 0;
933
934         /* delete timer */
935         del_timer_sync(&host->timer);
936
937         /* remove disk */
938         if (host->gd) {
939                 del_gendisk(host->gd);
940                 put_disk(host->gd);
941         }
942         /* remove queue */
943         if (host->breq)
944                 blk_cleanup_queue(host->breq);
945
946         /* unregister blk device */
947         unregister_blkdev(host->major, MG_DISK_NAME);
948
949         /* free irq */
950         if (!prv_data->use_polling)
951                 free_irq(host->irq, host);
952
953         /* free reset-out pin */
954         if (prv_data->dev_attr != MG_BOOT_DEV)
955                 gpio_free(host->rstout);
956
957         /* free rst pin */
958         if (host->rst)
959                 gpio_free(host->rst);
960
961         /* unmap io */
962         if (host->dev_base)
963                 iounmap(host->dev_base);
964
965         /* free mg_host */
966         kfree(host);
967
968         return err;
969 }
970
971 static struct platform_driver mg_disk_driver = {
972         .probe = mg_probe,
973         .remove = mg_remove,
974         .suspend = mg_suspend,
975         .resume = mg_resume,
976         .driver = {
977                 .name = MG_DEV_NAME,
978                 .owner = THIS_MODULE,
979         }
980 };
981
982 /****************************************************************************
983  *
984  * Module stuff
985  *
986  ****************************************************************************/
987
988 static int __init mg_init(void)
989 {
990         printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
991         return platform_driver_register(&mg_disk_driver);
992 }
993
994 static void __exit mg_exit(void)
995 {
996         printk(KERN_INFO "mflash driver : bye bye\n");
997         platform_driver_unregister(&mg_disk_driver);
998 }
999
1000 module_init(mg_init);
1001 module_exit(mg_exit);
1002
1003 MODULE_LICENSE("GPL");
1004 MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1005 MODULE_DESCRIPTION("mGine m[g]flash device driver");