Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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         if (rq_data_dir(req) == READ) {
691                 if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
692                                 != MG_ERR_NONE) {
693                         mg_bad_rw_intr(host);
694                         return host->error;
695                 }
696         } else {
697                 /* TODO : handler */
698                 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
699                 if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
700                                 != MG_ERR_NONE) {
701                         mg_bad_rw_intr(host);
702                         return host->error;
703                 }
704                 del_timer(&host->timer);
705                 mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
706                 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
707                 if (host->error) {
708                         mg_bad_rw_intr(host);
709                         return host->error;
710                 }
711                 mg_write_one(host, req);
712                 mod_timer(&host->timer, jiffies + 3 * HZ);
713                 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
714                                 MG_REG_COMMAND);
715         }
716         return MG_ERR_NONE;
717 }
718 
719 /* This function also called from IRQ context */
720 static void mg_request(struct request_queue *q)
721 {
722         struct mg_host *host = q->queuedata;
723         struct request *req;
724         u32 sect_num, sect_cnt;
725 
726         while (1) {
727                 if (!host->req) {
728                         host->req = blk_fetch_request(q);
729                         if (!host->req)
730                                 break;
731                 }
732                 req = host->req;
733 
734                 /* check unwanted request call */
735                 if (host->mg_do_intr)
736                         return;
737 
738                 del_timer(&host->timer);
739 
740                 sect_num = blk_rq_pos(req);
741                 /* deal whole segments */
742                 sect_cnt = blk_rq_sectors(req);
743 
744                 /* sanity check */
745                 if (sect_num >= get_capacity(req->rq_disk) ||
746                                 ((sect_num + sect_cnt) >
747                                  get_capacity(req->rq_disk))) {
748                         printk(KERN_WARNING
749                                         "%s: bad access: sector=%d, count=%d\n",
750                                         req->rq_disk->disk_name,
751                                         sect_num, sect_cnt);
752                         mg_end_request_cur(host, -EIO);
753                         continue;
754                 }
755 
756                 if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
757                         mg_end_request_cur(host, -EIO);
758                         continue;
759                 }
760 
761                 if (!mg_issue_req(req, host, sect_num, sect_cnt))
762                         return;
763         }
764 }
765 
766 static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
767 {
768         struct mg_host *host = bdev->bd_disk->private_data;
769 
770         geo->cylinders = (unsigned short)host->cyls;
771         geo->heads = (unsigned char)host->heads;
772         geo->sectors = (unsigned char)host->sectors;
773         return 0;
774 }
775 
776 static const struct block_device_operations mg_disk_ops = {
777         .getgeo = mg_getgeo
778 };
779 
780 #ifdef CONFIG_PM_SLEEP
781 static int mg_suspend(struct device *dev)
782 {
783         struct mg_drv_data *prv_data = dev->platform_data;
784         struct mg_host *host = prv_data->host;
785 
786         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
787                 return -EIO;
788 
789         if (!prv_data->use_polling)
790                 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
791 
792         outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
793         /* wait until mflash deep sleep */
794         msleep(1);
795 
796         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
797                 if (!prv_data->use_polling)
798                         outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
799                 return -EIO;
800         }
801 
802         return 0;
803 }
804 
805 static int mg_resume(struct device *dev)
806 {
807         struct mg_drv_data *prv_data = dev->platform_data;
808         struct mg_host *host = prv_data->host;
809 
810         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
811                 return -EIO;
812 
813         outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
814         /* wait until mflash wakeup */
815         msleep(1);
816 
817         if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
818                 return -EIO;
819 
820         if (!prv_data->use_polling)
821                 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
822 
823         return 0;
824 }
825 #endif
826 
827 static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume);
828 
829 static int mg_probe(struct platform_device *plat_dev)
830 {
831         struct mg_host *host;
832         struct resource *rsc;
833         struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
834         int err = 0;
835 
836         if (!prv_data) {
837                 printk(KERN_ERR "%s:%d fail (no driver_data)\n",
838                                 __func__, __LINE__);
839                 err = -EINVAL;
840                 goto probe_err;
841         }
842 
843         /* alloc mg_host */
844         host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
845         if (!host) {
846                 printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
847                                 __func__, __LINE__);
848                 err = -ENOMEM;
849                 goto probe_err;
850         }
851         host->major = MG_DISK_MAJ;
852 
853         /* link each other */
854         prv_data->host = host;
855         host->dev = &plat_dev->dev;
856 
857         /* io remap */
858         rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
859         if (!rsc) {
860                 printk(KERN_ERR "%s:%d platform_get_resource fail\n",
861                                 __func__, __LINE__);
862                 err = -EINVAL;
863                 goto probe_err_2;
864         }
865         host->dev_base = ioremap(rsc->start, resource_size(rsc));
866         if (!host->dev_base) {
867                 printk(KERN_ERR "%s:%d ioremap fail\n",
868                                 __func__, __LINE__);
869                 err = -EIO;
870                 goto probe_err_2;
871         }
872         MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
873 
874         /* get reset pin */
875         rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
876                         MG_RST_PIN);
877         if (!rsc) {
878                 printk(KERN_ERR "%s:%d get reset pin fail\n",
879                                 __func__, __LINE__);
880                 err = -EIO;
881                 goto probe_err_3;
882         }
883         host->rst = rsc->start;
884 
885         /* init rst pin */
886         err = gpio_request(host->rst, MG_RST_PIN);
887         if (err)
888                 goto probe_err_3;
889         gpio_direction_output(host->rst, 1);
890 
891         /* reset out pin */
892         if (!(prv_data->dev_attr & MG_DEV_MASK)) {
893                 err = -EINVAL;
894                 goto probe_err_3a;
895         }
896 
897         if (prv_data->dev_attr != MG_BOOT_DEV) {
898                 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
899                                 MG_RSTOUT_PIN);
900                 if (!rsc) {
901                         printk(KERN_ERR "%s:%d get reset-out pin fail\n",
902                                         __func__, __LINE__);
903                         err = -EIO;
904                         goto probe_err_3a;
905                 }
906                 host->rstout = rsc->start;
907                 err = gpio_request(host->rstout, MG_RSTOUT_PIN);
908                 if (err)
909                         goto probe_err_3a;
910                 gpio_direction_input(host->rstout);
911         }
912 
913         /* disk reset */
914         if (prv_data->dev_attr == MG_STORAGE_DEV) {
915                 /* If POR seq. not yet finished, wait */
916                 err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
917                 if (err)
918                         goto probe_err_3b;
919                 err = mg_disk_init(host);
920                 if (err) {
921                         printk(KERN_ERR "%s:%d fail (err code : %d)\n",
922                                         __func__, __LINE__, err);
923                         err = -EIO;
924                         goto probe_err_3b;
925                 }
926         }
927 
928         /* get irq resource */
929         if (!prv_data->use_polling) {
930                 host->irq = platform_get_irq(plat_dev, 0);
931                 if (host->irq == -ENXIO) {
932                         err = host->irq;
933                         goto probe_err_3b;
934                 }
935                 err = request_irq(host->irq, mg_irq,
936                                 IRQF_TRIGGER_RISING,
937                                 MG_DEV_NAME, host);
938                 if (err) {
939                         printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
940                                         __func__, __LINE__, err);
941                         goto probe_err_3b;
942                 }
943 
944         }
945 
946         /* get disk id */
947         err = mg_get_disk_id(host);
948         if (err) {
949                 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
950                                 __func__, __LINE__, err);
951                 err = -EIO;
952                 goto probe_err_4;
953         }
954 
955         err = register_blkdev(host->major, MG_DISK_NAME);
956         if (err < 0) {
957                 printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
958                                 __func__, __LINE__, err);
959                 goto probe_err_4;
960         }
961         if (!host->major)
962                 host->major = err;
963 
964         spin_lock_init(&host->lock);
965 
966         if (prv_data->use_polling)
967                 host->breq = blk_init_queue(mg_request_poll, &host->lock);
968         else
969                 host->breq = blk_init_queue(mg_request, &host->lock);
970 
971         if (!host->breq) {
972                 err = -ENOMEM;
973                 printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
974                                 __func__, __LINE__);
975                 goto probe_err_5;
976         }
977         host->breq->queuedata = host;
978 
979         /* mflash is random device, thanx for the noop */
980         err = elevator_change(host->breq, "noop");
981         if (err) {
982                 printk(KERN_ERR "%s:%d (elevator_init) fail\n",
983                                 __func__, __LINE__);
984                 goto probe_err_6;
985         }
986         blk_queue_max_hw_sectors(host->breq, MG_MAX_SECTS);
987         blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE);
988 
989         init_timer(&host->timer);
990         host->timer.function = mg_times_out;
991         host->timer.data = (unsigned long)host;
992 
993         host->gd = alloc_disk(MG_DISK_MAX_PART);
994         if (!host->gd) {
995                 printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
996                                 __func__, __LINE__);
997                 err = -ENOMEM;
998                 goto probe_err_7;
999         }
1000         host->gd->major = host->major;
1001         host->gd->first_minor = 0;
1002         host->gd->fops = &mg_disk_ops;
1003         host->gd->queue = host->breq;
1004         host->gd->private_data = host;
1005         sprintf(host->gd->disk_name, MG_DISK_NAME"a");
1006 
1007         set_capacity(host->gd, host->n_sectors);
1008 
1009         add_disk(host->gd);
1010 
1011         return err;
1012 
1013 probe_err_7:
1014         del_timer_sync(&host->timer);
1015 probe_err_6:
1016         blk_cleanup_queue(host->breq);
1017 probe_err_5:
1018         unregister_blkdev(host->major, MG_DISK_NAME);
1019 probe_err_4:
1020         if (!prv_data->use_polling)
1021                 free_irq(host->irq, host);
1022 probe_err_3b:
1023         gpio_free(host->rstout);
1024 probe_err_3a:
1025         gpio_free(host->rst);
1026 probe_err_3:
1027         iounmap(host->dev_base);
1028 probe_err_2:
1029         kfree(host);
1030 probe_err:
1031         return err;
1032 }
1033 
1034 static int mg_remove(struct platform_device *plat_dev)
1035 {
1036         struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
1037         struct mg_host *host = prv_data->host;
1038         int err = 0;
1039 
1040         /* delete timer */
1041         del_timer_sync(&host->timer);
1042 
1043         /* remove disk */
1044         if (host->gd) {
1045                 del_gendisk(host->gd);
1046                 put_disk(host->gd);
1047         }
1048         /* remove queue */
1049         if (host->breq)
1050                 blk_cleanup_queue(host->breq);
1051 
1052         /* unregister blk device */
1053         unregister_blkdev(host->major, MG_DISK_NAME);
1054 
1055         /* free irq */
1056         if (!prv_data->use_polling)
1057                 free_irq(host->irq, host);
1058 
1059         /* free reset-out pin */
1060         if (prv_data->dev_attr != MG_BOOT_DEV)
1061                 gpio_free(host->rstout);
1062 
1063         /* free rst pin */
1064         if (host->rst)
1065                 gpio_free(host->rst);
1066 
1067         /* unmap io */
1068         if (host->dev_base)
1069                 iounmap(host->dev_base);
1070 
1071         /* free mg_host */
1072         kfree(host);
1073 
1074         return err;
1075 }
1076 
1077 static struct platform_driver mg_disk_driver = {
1078         .probe = mg_probe,
1079         .remove = mg_remove,
1080         .driver = {
1081                 .name = MG_DEV_NAME,
1082                 .pm = &mg_pm,
1083         }
1084 };
1085 
1086 /****************************************************************************
1087  *
1088  * Module stuff
1089  *
1090  ****************************************************************************/
1091 
1092 static int __init mg_init(void)
1093 {
1094         printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1095         return platform_driver_register(&mg_disk_driver);
1096 }
1097 
1098 static void __exit mg_exit(void)
1099 {
1100         printk(KERN_INFO "mflash driver : bye bye\n");
1101         platform_driver_unregister(&mg_disk_driver);
1102 }
1103 
1104 module_init(mg_init);
1105 module_exit(mg_exit);
1106 
1107 MODULE_LICENSE("GPL");
1108 MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1109 MODULE_DESCRIPTION("mGine m[g]flash device driver");
1110 

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