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