Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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 #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                 .owner = THIS_MODULE,
1086                 .pm = &mg_pm,
1087         }
1088 };
1089 
1090 /****************************************************************************
1091  *
1092  * Module stuff
1093  *
1094  ****************************************************************************/
1095 
1096 static int __init mg_init(void)
1097 {
1098         printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1099         return platform_driver_register(&mg_disk_driver);
1100 }
1101 
1102 static void __exit mg_exit(void)
1103 {
1104         printk(KERN_INFO "mflash driver : bye bye\n");
1105         platform_driver_unregister(&mg_disk_driver);
1106 }
1107 
1108 module_init(mg_init);
1109 module_exit(mg_exit);
1110 
1111 MODULE_LICENSE("GPL");
1112 MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1113 MODULE_DESCRIPTION("mGine m[g]flash device driver");
1114 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us