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