linux/drivers/block/mg_disk.c
<<
>>
Prefs
   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 */
 108struct 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
 147static void mg_request(struct request_queue *);
 148
 149static 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
 158static 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
 163static 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
 213static 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
 268static 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
 282static 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
 289static 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() */
 308static 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() */
 330static 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
 343static 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
 403static 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
 443static 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
 451static 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
 480static void mg_read_one(struct mg_host *host, struct request *req)
 481{
 482        u16 *buff = (u16 *)req->buffer;
 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
 490static 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), req->buffer);
 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
 515static void mg_write_one(struct mg_host *host, struct request *req)
 516{
 517        u16 *buff = (u16 *)req->buffer;
 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
 525static 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), req->buffer);
 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
 564static 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
 584ok_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, req->buffer);
 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
 601static 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
 622ok_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), req->buffer);
 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
 639static 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
 657out_unlock:
 658        mg_request(host->breq);
 659        spin_unlock_irq(&host->lock);
 660}
 661
 662static 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
 685static unsigned int mg_issue_req(struct request *req,
 686                struct mg_host *host,
 687                unsigned int sect_num,
 688                unsigned int sect_cnt)
 689{
 690        switch (rq_data_dir(req)) {
 691        case READ:
 692                if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
 693                                != MG_ERR_NONE) {
 694                        mg_bad_rw_intr(host);
 695                        return host->error;
 696                }
 697                break;
 698        case WRITE:
 699                /* TODO : handler */
 700                outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
 701                if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
 702                                != MG_ERR_NONE) {
 703                        mg_bad_rw_intr(host);
 704                        return host->error;
 705                }
 706                del_timer(&host->timer);
 707                mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
 708                outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
 709                if (host->error) {
 710                        mg_bad_rw_intr(host);
 711                        return host->error;
 712                }
 713                mg_write_one(host, req);
 714                mod_timer(&host->timer, jiffies + 3 * HZ);
 715                outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
 716                                MG_REG_COMMAND);
 717                break;
 718        }
 719        return MG_ERR_NONE;
 720}
 721
 722/* This function also called from IRQ context */
 723static void mg_request(struct request_queue *q)
 724{
 725        struct mg_host *host = q->queuedata;
 726        struct request *req;
 727        u32 sect_num, sect_cnt;
 728
 729        while (1) {
 730                if (!host->req) {
 731                        host->req = blk_fetch_request(q);
 732                        if (!host->req)
 733                                break;
 734                }
 735                req = host->req;
 736
 737                /* check unwanted request call */
 738                if (host->mg_do_intr)
 739                        return;
 740
 741                del_timer(&host->timer);
 742
 743                sect_num = blk_rq_pos(req);
 744                /* deal whole segments */
 745                sect_cnt = blk_rq_sectors(req);
 746
 747                /* sanity check */
 748                if (sect_num >= get_capacity(req->rq_disk) ||
 749                                ((sect_num + sect_cnt) >
 750                                 get_capacity(req->rq_disk))) {
 751                        printk(KERN_WARNING
 752                                        "%s: bad access: sector=%d, count=%d\n",
 753                                        req->rq_disk->disk_name,
 754                                        sect_num, sect_cnt);
 755                        mg_end_request_cur(host, -EIO);
 756                        continue;
 757                }
 758
 759                if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
 760                        mg_end_request_cur(host, -EIO);
 761                        continue;
 762                }
 763
 764                if (!mg_issue_req(req, host, sect_num, sect_cnt))
 765                        return;
 766        }
 767}
 768
 769static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 770{
 771        struct mg_host *host = bdev->bd_disk->private_data;
 772
 773        geo->cylinders = (unsigned short)host->cyls;
 774        geo->heads = (unsigned char)host->heads;
 775        geo->sectors = (unsigned char)host->sectors;
 776        return 0;
 777}
 778
 779static const struct block_device_operations mg_disk_ops = {
 780        .getgeo = mg_getgeo
 781};
 782
 783#ifdef CONFIG_PM_SLEEP
 784static int mg_suspend(struct device *dev)
 785{
 786        struct mg_drv_data *prv_data = dev->platform_data;
 787        struct mg_host *host = prv_data->host;
 788
 789        if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
 790                return -EIO;
 791
 792        if (!prv_data->use_polling)
 793                outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
 794
 795        outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
 796        /* wait until mflash deep sleep */
 797        msleep(1);
 798
 799        if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
 800                if (!prv_data->use_polling)
 801                        outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
 802                return -EIO;
 803        }
 804
 805        return 0;
 806}
 807
 808static int mg_resume(struct device *dev)
 809{
 810        struct mg_drv_data *prv_data = dev->platform_data;
 811        struct mg_host *host = prv_data->host;
 812
 813        if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
 814                return -EIO;
 815
 816        outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
 817        /* wait until mflash wakeup */
 818        msleep(1);
 819
 820        if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
 821                return -EIO;
 822
 823        if (!prv_data->use_polling)
 824                outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
 825
 826        return 0;
 827}
 828#endif
 829
 830static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume);
 831
 832static int mg_probe(struct platform_device *plat_dev)
 833{
 834        struct mg_host *host;
 835        struct resource *rsc;
 836        struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
 837        int err = 0;
 838
 839        if (!prv_data) {
 840                printk(KERN_ERR "%s:%d fail (no driver_data)\n",
 841                                __func__, __LINE__);
 842                err = -EINVAL;
 843                goto probe_err;
 844        }
 845
 846        /* alloc mg_host */
 847        host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
 848        if (!host) {
 849                printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
 850                                __func__, __LINE__);
 851                err = -ENOMEM;
 852                goto probe_err;
 853        }
 854        host->major = MG_DISK_MAJ;
 855
 856        /* link each other */
 857        prv_data->host = host;
 858        host->dev = &plat_dev->dev;
 859
 860        /* io remap */
 861        rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
 862        if (!rsc) {
 863                printk(KERN_ERR "%s:%d platform_get_resource fail\n",
 864                                __func__, __LINE__);
 865                err = -EINVAL;
 866                goto probe_err_2;
 867        }
 868        host->dev_base = ioremap(rsc->start, resource_size(rsc));
 869        if (!host->dev_base) {
 870                printk(KERN_ERR "%s:%d ioremap fail\n",
 871                                __func__, __LINE__);
 872                err = -EIO;
 873                goto probe_err_2;
 874        }
 875        MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
 876
 877        /* get reset pin */
 878        rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
 879                        MG_RST_PIN);
 880        if (!rsc) {
 881                printk(KERN_ERR "%s:%d get reset pin fail\n",
 882                                __func__, __LINE__);
 883                err = -EIO;
 884                goto probe_err_3;
 885        }
 886        host->rst = rsc->start;
 887
 888        /* init rst pin */
 889        err = gpio_request(host->rst, MG_RST_PIN);
 890        if (err)
 891                goto probe_err_3;
 892        gpio_direction_output(host->rst, 1);
 893
 894        /* reset out pin */
 895        if (!(prv_data->dev_attr & MG_DEV_MASK)) {
 896                err = -EINVAL;
 897                goto probe_err_3a;
 898        }
 899
 900        if (prv_data->dev_attr != MG_BOOT_DEV) {
 901                rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
 902                                MG_RSTOUT_PIN);
 903                if (!rsc) {
 904                        printk(KERN_ERR "%s:%d get reset-out pin fail\n",
 905                                        __func__, __LINE__);
 906                        err = -EIO;
 907                        goto probe_err_3a;
 908                }
 909                host->rstout = rsc->start;
 910                err = gpio_request(host->rstout, MG_RSTOUT_PIN);
 911                if (err)
 912                        goto probe_err_3a;
 913                gpio_direction_input(host->rstout);
 914        }
 915
 916        /* disk reset */
 917        if (prv_data->dev_attr == MG_STORAGE_DEV) {
 918                /* If POR seq. not yet finished, wait */
 919                err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
 920                if (err)
 921                        goto probe_err_3b;
 922                err = mg_disk_init(host);
 923                if (err) {
 924                        printk(KERN_ERR "%s:%d fail (err code : %d)\n",
 925                                        __func__, __LINE__, err);
 926                        err = -EIO;
 927                        goto probe_err_3b;
 928                }
 929        }
 930
 931        /* get irq resource */
 932        if (!prv_data->use_polling) {
 933                host->irq = platform_get_irq(plat_dev, 0);
 934                if (host->irq == -ENXIO) {
 935                        err = host->irq;
 936                        goto probe_err_3b;
 937                }
 938                err = request_irq(host->irq, mg_irq,
 939                                IRQF_TRIGGER_RISING,
 940                                MG_DEV_NAME, host);
 941                if (err) {
 942                        printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
 943                                        __func__, __LINE__, err);
 944                        goto probe_err_3b;
 945                }
 946
 947        }
 948
 949        /* get disk id */
 950        err = mg_get_disk_id(host);
 951        if (err) {
 952                printk(KERN_ERR "%s:%d fail (err code : %d)\n",
 953                                __func__, __LINE__, err);
 954                err = -EIO;
 955                goto probe_err_4;
 956        }
 957
 958        err = register_blkdev(host->major, MG_DISK_NAME);
 959        if (err < 0) {
 960                printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
 961                                __func__, __LINE__, err);
 962                goto probe_err_4;
 963        }
 964        if (!host->major)
 965                host->major = err;
 966
 967        spin_lock_init(&host->lock);
 968
 969        if (prv_data->use_polling)
 970                host->breq = blk_init_queue(mg_request_poll, &host->lock);
 971        else
 972                host->breq = blk_init_queue(mg_request, &host->lock);
 973
 974        if (!host->breq) {
 975                err = -ENOMEM;
 976                printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
 977                                __func__, __LINE__);
 978                goto probe_err_5;
 979        }
 980        host->breq->queuedata = host;
 981
 982        /* mflash is random device, thanx for the noop */
 983        err = elevator_change(host->breq, "noop");
 984        if (err) {
 985                printk(KERN_ERR "%s:%d (elevator_init) fail\n",
 986                                __func__, __LINE__);
 987                goto probe_err_6;
 988        }
 989        blk_queue_max_hw_sectors(host->breq, MG_MAX_SECTS);
 990        blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE);
 991
 992        init_timer(&host->timer);
 993        host->timer.function = mg_times_out;
 994        host->timer.data = (unsigned long)host;
 995
 996        host->gd = alloc_disk(MG_DISK_MAX_PART);
 997        if (!host->gd) {
 998                printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
 999                                __func__, __LINE__);
1000                err = -ENOMEM;
1001                goto probe_err_7;
1002        }
1003        host->gd->major = host->major;
1004        host->gd->first_minor = 0;
1005        host->gd->fops = &mg_disk_ops;
1006        host->gd->queue = host->breq;
1007        host->gd->private_data = host;
1008        sprintf(host->gd->disk_name, MG_DISK_NAME"a");
1009
1010        set_capacity(host->gd, host->n_sectors);
1011
1012        add_disk(host->gd);
1013
1014        return err;
1015
1016probe_err_7:
1017        del_timer_sync(&host->timer);
1018probe_err_6:
1019        blk_cleanup_queue(host->breq);
1020probe_err_5:
1021        unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
1022probe_err_4:
1023        if (!prv_data->use_polling)
1024                free_irq(host->irq, host);
1025probe_err_3b:
1026        gpio_free(host->rstout);
1027probe_err_3a:
1028        gpio_free(host->rst);
1029probe_err_3:
1030        iounmap(host->dev_base);
1031probe_err_2:
1032        kfree(host);
1033probe_err:
1034        return err;
1035}
1036
1037static int mg_remove(struct platform_device *plat_dev)
1038{
1039        struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
1040        struct mg_host *host = prv_data->host;
1041        int err = 0;
1042
1043        /* delete timer */
1044        del_timer_sync(&host->timer);
1045
1046        /* remove disk */
1047        if (host->gd) {
1048                del_gendisk(host->gd);
1049                put_disk(host->gd);
1050        }
1051        /* remove queue */
1052        if (host->breq)
1053                blk_cleanup_queue(host->breq);
1054
1055        /* unregister blk device */
1056        unregister_blkdev(host->major, MG_DISK_NAME);
1057
1058        /* free irq */
1059        if (!prv_data->use_polling)
1060                free_irq(host->irq, host);
1061
1062        /* free reset-out pin */
1063        if (prv_data->dev_attr != MG_BOOT_DEV)
1064                gpio_free(host->rstout);
1065
1066        /* free rst pin */
1067        if (host->rst)
1068                gpio_free(host->rst);
1069
1070        /* unmap io */
1071        if (host->dev_base)
1072                iounmap(host->dev_base);
1073
1074        /* free mg_host */
1075        kfree(host);
1076
1077        return err;
1078}
1079
1080static struct platform_driver mg_disk_driver = {
1081        .probe = mg_probe,
1082        .remove = mg_remove,
1083        .driver = {
1084                .name = MG_DEV_NAME,
1085                .owner = THIS_MODULE,
1086                .pm = &mg_pm,
1087        }
1088};
1089
1090/****************************************************************************
1091 *
1092 * Module stuff
1093 *
1094 ****************************************************************************/
1095
1096static int __init mg_init(void)
1097{
1098        printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1099        return platform_driver_register(&mg_disk_driver);
1100}
1101
1102static void __exit mg_exit(void)
1103{
1104        printk(KERN_INFO "mflash driver : bye bye\n");
1105        platform_driver_unregister(&mg_disk_driver);
1106}
1107
1108module_init(mg_init);
1109module_exit(mg_exit);
1110
1111MODULE_LICENSE("GPL");
1112MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1113MODULE_DESCRIPTION("mGine m[g]flash device driver");
1114