drivers/ide/tx4939ide.c

   1 /*
   2  * TX4939 internal IDE driver
   3  * Based on RBTX49xx patch from CELF patch archive.
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * (C) Copyright TOSHIBA CORPORATION 2005-2007
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/ide.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/scatterlist.h>
  20
  21 #include <asm/ide.h>
  22
  23 #define MODNAME "tx4939ide"
  24
  25 /* ATA Shadow Registers (8-bit except for Data which is 16-bit) */
  26 #define TX4939IDE_Data                  0x000
  27 #define TX4939IDE_Error_Feature         0x001
  28 #define TX4939IDE_Sec                   0x002
  29 #define TX4939IDE_LBA0                  0x003
  30 #define TX4939IDE_LBA1                  0x004
  31 #define TX4939IDE_LBA2                  0x005
  32 #define TX4939IDE_DevHead               0x006
  33 #define TX4939IDE_Stat_Cmd              0x007
  34 #define TX4939IDE_AltStat_DevCtl        0x402
  35 /* H/W DMA Registers  */
  36 #define TX4939IDE_DMA_Cmd       0x800   /* 8-bit */
  37 #define TX4939IDE_DMA_Stat      0x802   /* 8-bit */
  38 #define TX4939IDE_PRD_Ptr       0x804   /* 32-bit */
  39 /* ATA100 CORE Registers (16-bit) */
  40 #define TX4939IDE_Sys_Ctl       0xc00
  41 #define TX4939IDE_Xfer_Cnt_1    0xc08
  42 #define TX4939IDE_Xfer_Cnt_2    0xc0a
  43 #define TX4939IDE_Sec_Cnt       0xc10
  44 #define TX4939IDE_Start_Lo_Addr 0xc18
  45 #define TX4939IDE_Start_Up_Addr 0xc20
  46 #define TX4939IDE_Add_Ctl       0xc28
  47 #define TX4939IDE_Lo_Burst_Cnt  0xc30
  48 #define TX4939IDE_Up_Burst_Cnt  0xc38
  49 #define TX4939IDE_PIO_Addr      0xc88
  50 #define TX4939IDE_H_Rst_Tim     0xc90
  51 #define TX4939IDE_Int_Ctl       0xc98
  52 #define TX4939IDE_Pkt_Cmd       0xcb8
  53 #define TX4939IDE_Bxfer_Cnt_Hi  0xcc0
  54 #define TX4939IDE_Bxfer_Cnt_Lo  0xcc8
  55 #define TX4939IDE_Dev_TErr      0xcd0
  56 #define TX4939IDE_Pkt_Xfer_Ctl  0xcd8
  57 #define TX4939IDE_Start_TAddr   0xce0
  58
  59 /* bits for Int_Ctl */
  60 #define TX4939IDE_INT_ADDRERR   0x80
  61 #define TX4939IDE_INT_REACHMUL  0x40
  62 #define TX4939IDE_INT_DEVTIMING 0x20
  63 #define TX4939IDE_INT_UDMATERM  0x10
  64 #define TX4939IDE_INT_TIMER     0x08
  65 #define TX4939IDE_INT_BUSERR    0x04
  66 #define TX4939IDE_INT_XFEREND   0x02
  67 #define TX4939IDE_INT_HOST      0x01
  68
  69 #define TX4939IDE_IGNORE_INTS   \
  70         (TX4939IDE_INT_ADDRERR | TX4939IDE_INT_REACHMUL | \
  71          TX4939IDE_INT_DEVTIMING | TX4939IDE_INT_UDMATERM | \
  72          TX4939IDE_INT_TIMER | TX4939IDE_INT_XFEREND)
  73
  74 #ifdef __BIG_ENDIAN
  75 #define tx4939ide_swizzlel(a)   ((a) ^ 4)
  76 #define tx4939ide_swizzlew(a)   ((a) ^ 6)
  77 #define tx4939ide_swizzleb(a)   ((a) ^ 7)
  78 #else
  79 #define tx4939ide_swizzlel(a)   (a)
  80 #define tx4939ide_swizzlew(a)   (a)
  81 #define tx4939ide_swizzleb(a)   (a)
  82 #endif
  83
  84 static u16 tx4939ide_readw(void __iomem *base, u32 reg)
  85 {
  86         return __raw_readw(base + tx4939ide_swizzlew(reg));
  87 }
  88 static u8 tx4939ide_readb(void __iomem *base, u32 reg)
  89 {
  90         return __raw_readb(base + tx4939ide_swizzleb(reg));
  91 }
  92 static void tx4939ide_writel(u32 val, void __iomem *base, u32 reg)
  93 {
  94         __raw_writel(val, base + tx4939ide_swizzlel(reg));
  95 }
  96 static void tx4939ide_writew(u16 val, void __iomem *base, u32 reg)
  97 {
  98         __raw_writew(val, base + tx4939ide_swizzlew(reg));
  99 }
 100 static void tx4939ide_writeb(u8 val, void __iomem *base, u32 reg)
 101 {
 102         __raw_writeb(val, base + tx4939ide_swizzleb(reg));
 103 }
 104
 105 #define TX4939IDE_BASE(hwif)    ((void __iomem *)(hwif)->extra_base)
 106
 107 static void tx4939ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
 108 {
 109         ide_hwif_t *hwif = drive->hwif;
 110         int is_slave = drive->dn;
 111         u32 mask, val;
 112         u8 safe = pio;
 113         ide_drive_t *pair;
 114
 115         pair = ide_get_pair_dev(drive);
 116         if (pair)
 117                 safe = min(safe, ide_get_best_pio_mode(pair, 255, 4));
 118         /*
 119          * Update Command Transfer Mode for master/slave and Data
 120          * Transfer Mode for this drive.
 121          */
 122         mask = is_slave ? 0x07f00000 : 0x000007f0;
 123         val = ((safe << 8) | (pio << 4)) << (is_slave ? 16 : 0);
 124         hwif->select_data = (hwif->select_data & ~mask) | val;
 125         /* tx4939ide_tf_load_fixup() will set the Sys_Ctl register */
 126 }
 127
 128 static void tx4939ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
 129 {
 130         ide_hwif_t *hwif = drive->hwif;
 131         u32 mask, val;
 132
 133         /* Update Data Transfer Mode for this drive. */
 134         if (mode >= XFER_UDMA_0)
 135                 val = mode - XFER_UDMA_0 + 8;
 136         else
 137                 val = mode - XFER_MW_DMA_0 + 5;
 138         if (drive->dn) {
 139                 mask = 0x00f00000;
 140                 val <<= 20;
 141         } else {
 142                 mask = 0x000000f0;
 143                 val <<= 4;
 144         }
 145         hwif->select_data = (hwif->select_data & ~mask) | val;
 146         /* tx4939ide_tf_load_fixup() will set the Sys_Ctl register */
 147 }
 148
 149 static u16 tx4939ide_check_error_ints(ide_hwif_t *hwif)
 150 {
 151         void __iomem *base = TX4939IDE_BASE(hwif);
 152         u16 ctl = tx4939ide_readw(base, TX4939IDE_Int_Ctl);
 153
 154         if (ctl & TX4939IDE_INT_BUSERR) {
 155                 /* reset FIFO */
 156                 u16 sysctl = tx4939ide_readw(base, TX4939IDE_Sys_Ctl);
 157
 158                 tx4939ide_writew(sysctl | 0x4000, base, TX4939IDE_Sys_Ctl);
 159                 mmiowb();
 160                 /* wait 12GBUSCLK (typ. 60ns @ GBUS200MHz, max 270ns) */
 161                 ndelay(270);
 162                 tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
 163         }
 164         if (ctl & (TX4939IDE_INT_ADDRERR |
 165                    TX4939IDE_INT_DEVTIMING | TX4939IDE_INT_BUSERR))
 166                 pr_err("%s: Error interrupt %#x (%s%s%s )\n",
 167                        hwif->name, ctl,
 168                        ctl & TX4939IDE_INT_ADDRERR ? " Address-Error" : "",
 169                        ctl & TX4939IDE_INT_DEVTIMING ? " DEV-Timing" : "",
 170                        ctl & TX4939IDE_INT_BUSERR ? " Bus-Error" : "");
 171         return ctl;
 172 }
 173
 174 static void tx4939ide_clear_irq(ide_drive_t *drive)
 175 {
 176         ide_hwif_t *hwif;
 177         void __iomem *base;
 178         u16 ctl;
 179
 180         /*
 181          * tx4939ide_dma_test_irq() and tx4939ide_dma_end() do all job
 182          * for DMA case.
 183          */
 184         if (drive->waiting_for_dma)
 185                 return;
 186         hwif = drive->hwif;
 187         base = TX4939IDE_BASE(hwif);
 188         ctl = tx4939ide_check_error_ints(hwif);
 189         tx4939ide_writew(ctl, base, TX4939IDE_Int_Ctl);
 190 }
 191
 192 static u8 tx4939ide_cable_detect(ide_hwif_t *hwif)
 193 {
 194         void __iomem *base = TX4939IDE_BASE(hwif);
 195
 196         return tx4939ide_readw(base, TX4939IDE_Sys_Ctl) & 0x2000 ?
 197                 ATA_CBL_PATA40 : ATA_CBL_PATA80;
 198 }
 199
 200 #ifdef __BIG_ENDIAN
 201 static void tx4939ide_dma_host_set(ide_drive_t *drive, int on)
 202 {
 203         ide_hwif_t *hwif = drive->hwif;
 204         u8 unit = drive->dn;
 205         void __iomem *base = TX4939IDE_BASE(hwif);
 206         u8 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
 207
 208         if (on)
 209                 dma_stat |= (1 << (5 + unit));
 210         else
 211                 dma_stat &= ~(1 << (5 + unit));
 212
 213         tx4939ide_writeb(dma_stat, base, TX4939IDE_DMA_Stat);
 214 }
 215 #else
 216 #define tx4939ide_dma_host_set  ide_dma_host_set
 217 #endif
 218
 219 static u8 tx4939ide_clear_dma_status(void __iomem *base)
 220 {
 221         u8 dma_stat;
 222
 223         /* read DMA status for INTR & ERROR flags */
 224         dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
 225         /* clear INTR & ERROR flags */
 226         tx4939ide_writeb(dma_stat | ATA_DMA_INTR | ATA_DMA_ERR, base,
 227                          TX4939IDE_DMA_Stat);
 228         /* recover intmask cleared by writing to bit2 of DMA_Stat */
 229         tx4939ide_writew(TX4939IDE_IGNORE_INTS << 8, base, TX4939IDE_Int_Ctl);
 230         return dma_stat;
 231 }
 232
 233 #ifdef __BIG_ENDIAN
 234 /* custom ide_build_dmatable to handle swapped layout */
 235 static int tx4939ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
 236 {
 237         ide_hwif_t *hwif = drive->hwif;
 238         u32 *table = (u32 *)hwif->dmatable_cpu;
 239         unsigned int count = 0;
 240         int i;
 241         struct scatterlist *sg;
 242
 243         for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
 244                 u32 cur_addr, cur_len, bcount;
 245
 246                 cur_addr = sg_dma_address(sg);
 247                 cur_len = sg_dma_len(sg);
 248
 249                 /*
 250                  * Fill in the DMA table, without crossing any 64kB boundaries.
 251                  */
 252
 253                 while (cur_len) {
 254                         if (count++ >= PRD_ENTRIES)
 255                                 goto use_pio_instead;
 256
 257                         bcount = 0x10000 - (cur_addr & 0xffff);
 258                         if (bcount > cur_len)
 259                                 bcount = cur_len;
 260                         /*
 261                          * This workaround for zero count seems required.
 262                          * (standard ide_build_dmatable does it too)
 263                          */
 264                         if (bcount == 0x10000)
 265                                 bcount = 0x8000;
 266                         *table++ = bcount & 0xffff;
 267                         *table++ = cur_addr;
 268                         cur_addr += bcount;
 269                         cur_len -= bcount;
 270                 }
 271         }
 272
 273         if (count) {
 274                 *(table - 2) |= 0x80000000;
 275                 return count;
 276         }
 277
 278 use_pio_instead:
 279         printk(KERN_ERR "%s: %s\n", drive->name,
 280                 count ? "DMA table too small" : "empty DMA table?");
 281
 282         return 0; /* revert to PIO for this request */
 283 }
 284 #else
 285 #define tx4939ide_build_dmatable        ide_build_dmatable
 286 #endif
 287
 288 static int tx4939ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
 289 {
 290         ide_hwif_t *hwif = drive->hwif;
 291         void __iomem *base = TX4939IDE_BASE(hwif);
 292         u8 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
 293
 294         /* fall back to PIO! */
 295         if (tx4939ide_build_dmatable(drive, cmd) == 0)
 296                 return 1;
 297
 298         /* PRD table */
 299         tx4939ide_writel(hwif->dmatable_dma, base, TX4939IDE_PRD_Ptr);
 300
 301         /* specify r/w */
 302         tx4939ide_writeb(rw, base, TX4939IDE_DMA_Cmd);
 303
 304         /* clear INTR & ERROR flags */
 305         tx4939ide_clear_dma_status(base);
 306
 307         tx4939ide_writew(SECTOR_SIZE / 2, base, drive->dn ?
 308                          TX4939IDE_Xfer_Cnt_2 : TX4939IDE_Xfer_Cnt_1);
 309
 310         tx4939ide_writew(cmd->rq->nr_sectors, base, TX4939IDE_Sec_Cnt);
 311
 312         return 0;
 313 }
 314
 315 static int tx4939ide_dma_end(ide_drive_t *drive)
 316 {
 317         ide_hwif_t *hwif = drive->hwif;
 318         u8 dma_stat, dma_cmd;
 319         void __iomem *base = TX4939IDE_BASE(hwif);
 320         u16 ctl = tx4939ide_readw(base, TX4939IDE_Int_Ctl);
 321
 322         /* get DMA command mode */
 323         dma_cmd = tx4939ide_readb(base, TX4939IDE_DMA_Cmd);
 324         /* stop DMA */
 325         tx4939ide_writeb(dma_cmd & ~ATA_DMA_START, base, TX4939IDE_DMA_Cmd);
 326
 327         /* read and clear the INTR & ERROR bits */
 328         dma_stat = tx4939ide_clear_dma_status(base);
 329
 330 #define CHECK_DMA_MASK (ATA_DMA_ACTIVE | ATA_DMA_ERR | ATA_DMA_INTR)
 331
 332         /* verify good DMA status */
 333         if ((dma_stat & CHECK_DMA_MASK) == 0 &&
 334             (ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST)) ==
 335             (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST))
 336                 /* INT_IDE lost... bug? */
 337                 return 0;
 338         return ((dma_stat & CHECK_DMA_MASK) !=
 339                 ATA_DMA_INTR) ? 0x10 | dma_stat : 0;
 340 }
 341
 342 /* returns 1 if DMA IRQ issued, 0 otherwise */
 343 static int tx4939ide_dma_test_irq(ide_drive_t *drive)
 344 {
 345         ide_hwif_t *hwif = drive->hwif;
 346         void __iomem *base = TX4939IDE_BASE(hwif);
 347         u16 ctl, ide_int;
 348         u8 dma_stat, stat;
 349         int found = 0;
 350
 351         ctl = tx4939ide_check_error_ints(hwif);
 352         ide_int = ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST);
 353         switch (ide_int) {
 354         case TX4939IDE_INT_HOST:
 355                 /* On error, XFEREND might not be asserted. */
 356                 stat = tx4939ide_readb(base, TX4939IDE_AltStat_DevCtl);
 357                 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_ERR)) == ATA_ERR)
 358                         found = 1;
 359                 else
 360                         /* Wait for XFEREND (Mask HOST and unmask XFEREND) */
 361                         ctl &= ~TX4939IDE_INT_XFEREND << 8;
 362                 ctl |= ide_int << 8;
 363                 break;
 364         case TX4939IDE_INT_HOST | TX4939IDE_INT_XFEREND:
 365                 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
 366                 if (!(dma_stat & ATA_DMA_INTR))
 367                         pr_warning("%s: weird interrupt status. "
 368                                    "DMA_Stat %#02x int_ctl %#04x\n",
 369                                    hwif->name, dma_stat, ctl);
 370                 found = 1;
 371                 break;
 372         }
 373         /*
 374          * Do not clear XFEREND, HOST now.  They will be cleared by
 375          * clearing bit2 of DMA_Stat.
 376          */
 377         ctl &= ~ide_int;
 378         tx4939ide_writew(ctl, base, TX4939IDE_Int_Ctl);
 379         return found;
 380 }
 381
 382 #ifdef __BIG_ENDIAN
 383 static u8 tx4939ide_dma_sff_read_status(ide_hwif_t *hwif)
 384 {
 385         void __iomem *base = TX4939IDE_BASE(hwif);
 386
 387         return tx4939ide_readb(base, TX4939IDE_DMA_Stat);
 388 }
 389 #else
 390 #define tx4939ide_dma_sff_read_status ide_dma_sff_read_status
 391 #endif
 392
 393 static void tx4939ide_init_hwif(ide_hwif_t *hwif)
 394 {
 395         void __iomem *base = TX4939IDE_BASE(hwif);
 396
 397         /* Soft Reset */
 398         tx4939ide_writew(0x8000, base, TX4939IDE_Sys_Ctl);
 399         mmiowb();
 400         /* at least 20 GBUSCLK (typ. 100ns @ GBUS200MHz, max 450ns) */
 401         ndelay(450);
 402         tx4939ide_writew(0x0000, base, TX4939IDE_Sys_Ctl);
 403         /* mask some interrupts and clear all interrupts */
 404         tx4939ide_writew((TX4939IDE_IGNORE_INTS << 8) | 0xff, base,
 405                          TX4939IDE_Int_Ctl);
 406
 407         tx4939ide_writew(0x0008, base, TX4939IDE_Lo_Burst_Cnt);
 408         tx4939ide_writew(0, base, TX4939IDE_Up_Burst_Cnt);
 409 }
 410
 411 static int tx4939ide_init_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
 412 {
 413         hwif->dma_base =
 414                 hwif->extra_base + tx4939ide_swizzleb(TX4939IDE_DMA_Cmd);
 415         /*
 416          * Note that we cannot use ATA_DMA_TABLE_OFS, ATA_DMA_STATUS
 417          * for big endian.
 418          */
 419         return ide_allocate_dma_engine(hwif);
 420 }
 421
 422 static void tx4939ide_tf_load_fixup(ide_drive_t *drive)
 423 {
 424         ide_hwif_t *hwif = drive->hwif;
 425         void __iomem *base = TX4939IDE_BASE(hwif);
 426         u16 sysctl = hwif->select_data >> (drive->dn ? 16 : 0);
 427
 428         /*
 429          * Fix ATA100 CORE System Control Register. (The write to the
 430          * Device/Head register may write wrong data to the System
 431          * Control Register)
 432          * While Sys_Ctl is written here, dev_select() is not needed.
 433          */
 434         tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
 435 }
 436
 437 static void tx4939ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf,
 438                               u8 valid)
 439 {
 440         ide_tf_load(drive, tf, valid);
 441
 442         if (valid & IDE_VALID_DEVICE)
 443                 tx4939ide_tf_load_fixup(drive);
 444 }
 445
 446 #ifdef __BIG_ENDIAN
 447
 448 /* custom iops (independent from SWAP_IO_SPACE) */
 449 static void tx4939ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
 450                                 void *buf, unsigned int len)
 451 {
 452         unsigned long port = drive->hwif->io_ports.data_addr;
 453         unsigned short *ptr = buf;
 454         unsigned int count = (len + 1) / 2;
 455
 456         while (count--)
 457                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
 458         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 459 }
 460
 461 static void tx4939ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
 462                                 void *buf, unsigned int len)
 463 {
 464         unsigned long port = drive->hwif->io_ports.data_addr;
 465         unsigned short *ptr = buf;
 466         unsigned int count = (len + 1) / 2;
 467
 468         while (count--) {
 469                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
 470                 ptr++;
 471         }
 472         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 473 }
 474
 475 static const struct ide_tp_ops tx4939ide_tp_ops = {
 476         .exec_command           = ide_exec_command,
 477         .read_status            = ide_read_status,
 478         .read_altstatus         = ide_read_altstatus,
 479         .write_devctl           = ide_write_devctl,
 480
 481         .dev_select             = ide_dev_select,
 482         .tf_load                = tx4939ide_tf_load,
 483         .tf_read                = ide_tf_read,
 484
 485         .input_data             = tx4939ide_input_data_swap,
 486         .output_data            = tx4939ide_output_data_swap,
 487 };
 488
 489 #else   /* __LITTLE_ENDIAN */
 490
 491 static const struct ide_tp_ops tx4939ide_tp_ops = {
 492         .exec_command           = ide_exec_command,
 493         .read_status            = ide_read_status,
 494         .read_altstatus         = ide_read_altstatus,
 495         .write_devctl           = ide_write_devctl,
 496
 497         .dev_select             = ide_dev_select,
 498         .tf_load                = tx4939ide_tf_load,
 499         .tf_read                = ide_tf_read,
 500
 501         .input_data             = ide_input_data,
 502         .output_data            = ide_output_data,
 503 };
 504
 505 #endif  /* __LITTLE_ENDIAN */
 506
 507 static const struct ide_port_ops tx4939ide_port_ops = {
 508         .set_pio_mode           = tx4939ide_set_pio_mode,
 509         .set_dma_mode           = tx4939ide_set_dma_mode,
 510         .clear_irq              = tx4939ide_clear_irq,
 511         .cable_detect           = tx4939ide_cable_detect,
 512 };
 513
 514 static const struct ide_dma_ops tx4939ide_dma_ops = {
 515         .dma_host_set           = tx4939ide_dma_host_set,
 516         .dma_setup              = tx4939ide_dma_setup,
 517         .dma_start              = ide_dma_start,
 518         .dma_end                = tx4939ide_dma_end,
 519         .dma_test_irq           = tx4939ide_dma_test_irq,
 520         .dma_lost_irq           = ide_dma_lost_irq,
 521         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 522         .dma_sff_read_status    = tx4939ide_dma_sff_read_status,
 523 };
 524
 525 static const struct ide_port_info tx4939ide_port_info __initdata = {
 526         .init_hwif              = tx4939ide_init_hwif,
 527         .init_dma               = tx4939ide_init_dma,
 528         .port_ops               = &tx4939ide_port_ops,
 529         .dma_ops                = &tx4939ide_dma_ops,
 530         .tp_ops                 = &tx4939ide_tp_ops,
 531         .host_flags             = IDE_HFLAG_MMIO,
 532         .pio_mask               = ATA_PIO4,
 533         .mwdma_mask             = ATA_MWDMA2,
 534         .udma_mask              = ATA_UDMA5,
 535         .chipset                = ide_generic,
 536 };
 537
 538 static int __init tx4939ide_probe(struct platform_device *pdev)
 539 {
 540         hw_regs_t hw;
 541         hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
 542         struct ide_host *host;
 543         struct resource *res;
 544         int irq, ret;
 545         unsigned long mapbase;
 546
 547         irq = platform_get_irq(pdev, 0);
 548         if (irq < 0)
 549                 return -ENODEV;
 550         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 551         if (!res)
 552                 return -ENODEV;
 553
 554         if (!devm_request_mem_region(&pdev->dev, res->start,
 555                                      res->end - res->start + 1, "tx4938ide"))
 556                 return -EBUSY;
 557         mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 558                                               res->end - res->start + 1);
 559         if (!mapbase)
 560                 return -EBUSY;
 561         memset(&hw, 0, sizeof(hw));
 562         hw.io_ports.data_addr =
 563                 mapbase + tx4939ide_swizzlew(TX4939IDE_Data);
 564         hw.io_ports.error_addr =
 565                 mapbase + tx4939ide_swizzleb(TX4939IDE_Error_Feature);
 566         hw.io_ports.nsect_addr =
 567                 mapbase + tx4939ide_swizzleb(TX4939IDE_Sec);
 568         hw.io_ports.lbal_addr =
 569                 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA0);
 570         hw.io_ports.lbam_addr =
 571                 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA1);
 572         hw.io_ports.lbah_addr =
 573                 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA2);
 574         hw.io_ports.device_addr =
 575                 mapbase + tx4939ide_swizzleb(TX4939IDE_DevHead);
 576         hw.io_ports.command_addr =
 577                 mapbase + tx4939ide_swizzleb(TX4939IDE_Stat_Cmd);
 578         hw.io_ports.ctl_addr =
 579                 mapbase + tx4939ide_swizzleb(TX4939IDE_AltStat_DevCtl);
 580         hw.irq = irq;
 581         hw.dev = &pdev->dev;
 582
 583         pr_info("TX4939 IDE interface (base %#lx, irq %d)\n", mapbase, irq);
 584         host = ide_host_alloc(&tx4939ide_port_info, hws);
 585         if (!host)
 586                 return -ENOMEM;
 587         /* use extra_base for base address of the all registers */
 588         host->ports[0]->extra_base = mapbase;
 589         ret = ide_host_register(host, &tx4939ide_port_info, hws);
 590         if (ret) {
 591                 ide_host_free(host);
 592                 return ret;
 593         }
 594         platform_set_drvdata(pdev, host);
 595         return 0;
 596 }
 597
 598 static int __exit tx4939ide_remove(struct platform_device *pdev)
 599 {
 600         struct ide_host *host = platform_get_drvdata(pdev);
 601
 602         ide_host_remove(host);
 603         return 0;
 604 }
 605
 606 #ifdef CONFIG_PM
 607 static int tx4939ide_resume(struct platform_device *dev)
 608 {
 609         struct ide_host *host = platform_get_drvdata(dev);
 610         ide_hwif_t *hwif = host->ports[0];
 611
 612         tx4939ide_init_hwif(hwif);
 613         return 0;
 614 }
 615 #else
 616 #define tx4939ide_resume        NULL
 617 #endif
 618
 619 static struct platform_driver tx4939ide_driver = {
 620         .driver = {
 621                 .name = MODNAME,
 622                 .owner = THIS_MODULE,
 623         },
 624         .remove = __exit_p(tx4939ide_remove),
 625         .resume = tx4939ide_resume,
 626 };
 627
 628 static int __init tx4939ide_init(void)
 629 {
 630         return platform_driver_probe(&tx4939ide_driver, tx4939ide_probe);
 631 }
 632
 633 static void __exit tx4939ide_exit(void)
 634 {
 635         platform_driver_unregister(&tx4939ide_driver);
 636 }
 637
 638 module_init(tx4939ide_init);
 639 module_exit(tx4939ide_exit);
 640
 641 MODULE_DESCRIPTION("TX4939 internal IDE driver");
 642 MODULE_LICENSE("GPL");
 643 MODULE_ALIAS("platform:tx4939ide");