drivers/ide/icside.c

   1 /*
   2  * Copyright (c) 1996-2004 Russell King.
   3  *
   4  * Please note that this platform does not support 32-bit IDE IO.
   5  */
   6
   7 #include <linux/string.h>
   8 #include <linux/module.h>
   9 #include <linux/ioport.h>
  10 #include <linux/slab.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/errno.h>
  13 #include <linux/ide.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/device.h>
  16 #include <linux/init.h>
  17 #include <linux/scatterlist.h>
  18 #include <linux/io.h>
  19
  20 #include <asm/dma.h>
  21 #include <asm/ecard.h>
  22
  23 #define DRV_NAME "icside"
  24
  25 #define ICS_IDENT_OFFSET                0x2280
  26
  27 #define ICS_ARCIN_V5_INTRSTAT           0x0000
  28 #define ICS_ARCIN_V5_INTROFFSET         0x0004
  29 #define ICS_ARCIN_V5_IDEOFFSET          0x2800
  30 #define ICS_ARCIN_V5_IDEALTOFFSET       0x2b80
  31 #define ICS_ARCIN_V5_IDESTEPPING        6
  32
  33 #define ICS_ARCIN_V6_IDEOFFSET_1        0x2000
  34 #define ICS_ARCIN_V6_INTROFFSET_1       0x2200
  35 #define ICS_ARCIN_V6_INTRSTAT_1         0x2290
  36 #define ICS_ARCIN_V6_IDEALTOFFSET_1     0x2380
  37 #define ICS_ARCIN_V6_IDEOFFSET_2        0x3000
  38 #define ICS_ARCIN_V6_INTROFFSET_2       0x3200
  39 #define ICS_ARCIN_V6_INTRSTAT_2         0x3290
  40 #define ICS_ARCIN_V6_IDEALTOFFSET_2     0x3380
  41 #define ICS_ARCIN_V6_IDESTEPPING        6
  42
  43 struct cardinfo {
  44         unsigned int dataoffset;
  45         unsigned int ctrloffset;
  46         unsigned int stepping;
  47 };
  48
  49 static struct cardinfo icside_cardinfo_v5 = {
  50         .dataoffset     = ICS_ARCIN_V5_IDEOFFSET,
  51         .ctrloffset     = ICS_ARCIN_V5_IDEALTOFFSET,
  52         .stepping       = ICS_ARCIN_V5_IDESTEPPING,
  53 };
  54
  55 static struct cardinfo icside_cardinfo_v6_1 = {
  56         .dataoffset     = ICS_ARCIN_V6_IDEOFFSET_1,
  57         .ctrloffset     = ICS_ARCIN_V6_IDEALTOFFSET_1,
  58         .stepping       = ICS_ARCIN_V6_IDESTEPPING,
  59 };
  60
  61 static struct cardinfo icside_cardinfo_v6_2 = {
  62         .dataoffset     = ICS_ARCIN_V6_IDEOFFSET_2,
  63         .ctrloffset     = ICS_ARCIN_V6_IDEALTOFFSET_2,
  64         .stepping       = ICS_ARCIN_V6_IDESTEPPING,
  65 };
  66
  67 struct icside_state {
  68         void __iomem *irq_port;
  69         void __iomem *ioc_base;
  70         unsigned int sel;
  71         unsigned int type;
  72         struct ide_host *host;
  73 };
  74
  75 #define ICS_TYPE_A3IN   0
  76 #define ICS_TYPE_A3USER 1
  77 #define ICS_TYPE_V6     3
  78 #define ICS_TYPE_V5     15
  79 #define ICS_TYPE_NOTYPE ((unsigned int)-1)
  80
  81 /* ---------------- Version 5 PCB Support Functions --------------------- */
  82 /* Prototype: icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
  83  * Purpose  : enable interrupts from card
  84  */
  85 static void icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
  86 {
  87         struct icside_state *state = ec->irq_data;
  88
  89         writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET);
  90 }
  91
  92 /* Prototype: icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
  93  * Purpose  : disable interrupts from card
  94  */
  95 static void icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
  96 {
  97         struct icside_state *state = ec->irq_data;
  98
  99         readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET);
 100 }
 101
 102 static const expansioncard_ops_t icside_ops_arcin_v5 = {
 103         .irqenable      = icside_irqenable_arcin_v5,
 104         .irqdisable     = icside_irqdisable_arcin_v5,
 105 };
 106
 107
 108 /* ---------------- Version 6 PCB Support Functions --------------------- */
 109 /* Prototype: icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
 110  * Purpose  : enable interrupts from card
 111  */
 112 static void icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
 113 {
 114         struct icside_state *state = ec->irq_data;
 115         void __iomem *base = state->irq_port;
 116
 117         writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1);
 118         readb(base + ICS_ARCIN_V6_INTROFFSET_2);
 119
 120         writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2);
 121         readb(base + ICS_ARCIN_V6_INTROFFSET_1);
 122 }
 123
 124 /* Prototype: icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
 125  * Purpose  : disable interrupts from card
 126  */
 127 static void icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
 128 {
 129         struct icside_state *state = ec->irq_data;
 130
 131         readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
 132         readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
 133 }
 134
 135 /* Prototype: icside_irqprobe(struct expansion_card *ec)
 136  * Purpose  : detect an active interrupt from card
 137  */
 138 static int icside_irqpending_arcin_v6(struct expansion_card *ec)
 139 {
 140         struct icside_state *state = ec->irq_data;
 141
 142         return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 ||
 143                readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1;
 144 }
 145
 146 static const expansioncard_ops_t icside_ops_arcin_v6 = {
 147         .irqenable      = icside_irqenable_arcin_v6,
 148         .irqdisable     = icside_irqdisable_arcin_v6,
 149         .irqpending     = icside_irqpending_arcin_v6,
 150 };
 151
 152 #ifdef CONFIG_BLK_DEV_IDEDMA_ICS
 153 /*
 154  * SG-DMA support.
 155  *
 156  * Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers.
 157  * There is only one DMA controller per card, which means that only
 158  * one drive can be accessed at one time.  NOTE! We do not enforce that
 159  * here, but we rely on the main IDE driver spotting that both
 160  * interfaces use the same IRQ, which should guarantee this.
 161  */
 162
 163 /*
 164  * Configure the IOMD to give the appropriate timings for the transfer
 165  * mode being requested.  We take the advice of the ATA standards, and
 166  * calculate the cycle time based on the transfer mode, and the EIDE
 167  * MW DMA specs that the drive provides in the IDENTIFY command.
 168  *
 169  * We have the following IOMD DMA modes to choose from:
 170  *
 171  *      Type    Active          Recovery        Cycle
 172  *      A       250 (250)       312 (550)       562 (800)
 173  *      B       187             250             437
 174  *      C       125 (125)       125 (375)       250 (500)
 175  *      D       62              125             187
 176  *
 177  * (figures in brackets are actual measured timings)
 178  *
 179  * However, we also need to take care of the read/write active and
 180  * recovery timings:
 181  *
 182  *                      Read    Write
 183  *      Mode    Active  -- Recovery --  Cycle   IOMD type
 184  *      MW0     215     50      215     480     A
 185  *      MW1     80      50      50      150     C
 186  *      MW2     70      25      25      120     C
 187  */
 188 static void icside_set_dma_mode(ide_drive_t *drive, const u8 xfer_mode)
 189 {
 190         unsigned long cycle_time;
 191         int use_dma_info = 0;
 192
 193         switch (xfer_mode) {
 194         case XFER_MW_DMA_2:
 195                 cycle_time = 250;
 196                 use_dma_info = 1;
 197                 break;
 198
 199         case XFER_MW_DMA_1:
 200                 cycle_time = 250;
 201                 use_dma_info = 1;
 202                 break;
 203
 204         case XFER_MW_DMA_0:
 205                 cycle_time = 480;
 206                 break;
 207
 208         case XFER_SW_DMA_2:
 209         case XFER_SW_DMA_1:
 210         case XFER_SW_DMA_0:
 211                 cycle_time = 480;
 212                 break;
 213         }
 214
 215         /*
 216          * If we're going to be doing MW_DMA_1 or MW_DMA_2, we should
 217          * take care to note the values in the ID...
 218          */
 219         if (use_dma_info && drive->id[ATA_ID_EIDE_DMA_TIME] > cycle_time)
 220                 cycle_time = drive->id[ATA_ID_EIDE_DMA_TIME];
 221
 222         ide_set_drivedata(drive, (void *)cycle_time);
 223
 224         printk("%s: %s selected (peak %dMB/s)\n", drive->name,
 225                 ide_xfer_verbose(xfer_mode),
 226                 2000 / (unsigned long)ide_get_drivedata(drive));
 227 }
 228
 229 static const struct ide_port_ops icside_v6_port_ops = {
 230         .set_dma_mode           = icside_set_dma_mode,
 231 };
 232
 233 static void icside_dma_host_set(ide_drive_t *drive, int on)
 234 {
 235 }
 236
 237 static int icside_dma_end(ide_drive_t *drive)
 238 {
 239         ide_hwif_t *hwif = drive->hwif;
 240         struct expansion_card *ec = ECARD_DEV(hwif->dev);
 241
 242         disable_dma(ec->dma);
 243
 244         return get_dma_residue(ec->dma) != 0;
 245 }
 246
 247 static void icside_dma_start(ide_drive_t *drive)
 248 {
 249         ide_hwif_t *hwif = drive->hwif;
 250         struct expansion_card *ec = ECARD_DEV(hwif->dev);
 251
 252         /* We can not enable DMA on both channels simultaneously. */
 253         BUG_ON(dma_channel_active(ec->dma));
 254         enable_dma(ec->dma);
 255 }
 256
 257 static int icside_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
 258 {
 259         ide_hwif_t *hwif = drive->hwif;
 260         struct expansion_card *ec = ECARD_DEV(hwif->dev);
 261         struct icside_state *state = ecard_get_drvdata(ec);
 262         unsigned int dma_mode;
 263
 264         if (cmd->tf_flags & IDE_TFLAG_WRITE)
 265                 dma_mode = DMA_MODE_WRITE;
 266         else
 267                 dma_mode = DMA_MODE_READ;
 268
 269         /*
 270          * We can not enable DMA on both channels.
 271          */
 272         BUG_ON(dma_channel_active(ec->dma));
 273
 274         /*
 275          * Route the DMA signals to the correct interface.
 276          */
 277         writeb(state->sel | hwif->channel, state->ioc_base);
 278
 279         /*
 280          * Select the correct timing for this drive.
 281          */
 282         set_dma_speed(ec->dma, (unsigned long)ide_get_drivedata(drive));
 283
 284         /*
 285          * Tell the DMA engine about the SG table and
 286          * data direction.
 287          */
 288         set_dma_sg(ec->dma, hwif->sg_table, cmd->sg_nents);
 289         set_dma_mode(ec->dma, dma_mode);
 290
 291         return 0;
 292 }
 293
 294 static int icside_dma_test_irq(ide_drive_t *drive)
 295 {
 296         ide_hwif_t *hwif = drive->hwif;
 297         struct expansion_card *ec = ECARD_DEV(hwif->dev);
 298         struct icside_state *state = ecard_get_drvdata(ec);
 299
 300         return readb(state->irq_port +
 301                      (hwif->channel ?
 302                         ICS_ARCIN_V6_INTRSTAT_2 :
 303                         ICS_ARCIN_V6_INTRSTAT_1)) & 1;
 304 }
 305
 306 static int icside_dma_init(ide_hwif_t *hwif, const struct ide_port_info *d)
 307 {
 308         hwif->dmatable_cpu      = NULL;
 309         hwif->dmatable_dma      = 0;
 310
 311         return 0;
 312 }
 313
 314 static const struct ide_dma_ops icside_v6_dma_ops = {
 315         .dma_host_set           = icside_dma_host_set,
 316         .dma_setup              = icside_dma_setup,
 317         .dma_start              = icside_dma_start,
 318         .dma_end                = icside_dma_end,
 319         .dma_test_irq           = icside_dma_test_irq,
 320         .dma_lost_irq           = ide_dma_lost_irq,
 321 };
 322 #else
 323 #define icside_v6_dma_ops NULL
 324 #endif
 325
 326 static int icside_dma_off_init(ide_hwif_t *hwif, const struct ide_port_info *d)
 327 {
 328         return -EOPNOTSUPP;
 329 }
 330
 331 static void icside_setup_ports(struct ide_hw *hw, void __iomem *base,
 332                                struct cardinfo *info, struct expansion_card *ec)
 333 {
 334         unsigned long port = (unsigned long)base + info->dataoffset;
 335
 336         hw->io_ports.data_addr   = port;
 337         hw->io_ports.error_addr  = port + (1 << info->stepping);
 338         hw->io_ports.nsect_addr  = port + (2 << info->stepping);
 339         hw->io_ports.lbal_addr   = port + (3 << info->stepping);
 340         hw->io_ports.lbam_addr   = port + (4 << info->stepping);
 341         hw->io_ports.lbah_addr   = port + (5 << info->stepping);
 342         hw->io_ports.device_addr = port + (6 << info->stepping);
 343         hw->io_ports.status_addr = port + (7 << info->stepping);
 344         hw->io_ports.ctl_addr    = (unsigned long)base + info->ctrloffset;
 345
 346         hw->irq = ec->irq;
 347         hw->dev = &ec->dev;
 348 }
 349
 350 static const struct ide_port_info icside_v5_port_info = {
 351         .host_flags             = IDE_HFLAG_NO_DMA,
 352         .chipset                = ide_acorn,
 353 };
 354
 355 static int __devinit
 356 icside_register_v5(struct icside_state *state, struct expansion_card *ec)
 357 {
 358         void __iomem *base;
 359         struct ide_host *host;
 360         struct ide_hw hw, *hws[] = { &hw };
 361         int ret;
 362
 363         base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 364         if (!base)
 365                 return -ENOMEM;
 366
 367         state->irq_port = base;
 368
 369         ec->irqaddr  = base + ICS_ARCIN_V5_INTRSTAT;
 370         ec->irqmask  = 1;
 371
 372         ecard_setirq(ec, &icside_ops_arcin_v5, state);
 373
 374         /*
 375          * Be on the safe side - disable interrupts
 376          */
 377         icside_irqdisable_arcin_v5(ec, 0);
 378
 379         icside_setup_ports(&hw, base, &icside_cardinfo_v5, ec);
 380
 381         host = ide_host_alloc(&icside_v5_port_info, hws, 1);
 382         if (host == NULL)
 383                 return -ENODEV;
 384
 385         state->host = host;
 386
 387         ecard_set_drvdata(ec, state);
 388
 389         ret = ide_host_register(host, &icside_v5_port_info, hws);
 390         if (ret)
 391                 goto err_free;
 392
 393         return 0;
 394 err_free:
 395         ide_host_free(host);
 396         ecard_set_drvdata(ec, NULL);
 397         return ret;
 398 }
 399
 400 static const struct ide_port_info icside_v6_port_info __initdata = {
 401         .init_dma               = icside_dma_off_init,
 402         .dma_ops                = &icside_v6_dma_ops,
 403         .host_flags             = IDE_HFLAG_SERIALIZE | IDE_HFLAG_MMIO,
 404         .mwdma_mask             = ATA_MWDMA2,
 405         .swdma_mask             = ATA_SWDMA2,
 406         .chipset                = ide_acorn,
 407 };
 408
 409 static int __devinit
 410 icside_register_v6(struct icside_state *state, struct expansion_card *ec)
 411 {
 412         void __iomem *ioc_base, *easi_base;
 413         struct ide_host *host;
 414         unsigned int sel = 0;
 415         int ret;
 416         struct ide_hw hw[2], *hws[] = { &hw[0], &hw[1] };
 417         struct ide_port_info d = icside_v6_port_info;
 418
 419         ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
 420         if (!ioc_base) {
 421                 ret = -ENOMEM;
 422                 goto out;
 423         }
 424
 425         easi_base = ioc_base;
 426
 427         if (ecard_resource_flags(ec, ECARD_RES_EASI)) {
 428                 easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0);
 429                 if (!easi_base) {
 430                         ret = -ENOMEM;
 431                         goto out;
 432                 }
 433
 434                 /*
 435                  * Enable access to the EASI region.
 436                  */
 437                 sel = 1 << 5;
 438         }
 439
 440         writeb(sel, ioc_base);
 441
 442         ecard_setirq(ec, &icside_ops_arcin_v6, state);
 443
 444         state->irq_port   = easi_base;
 445         state->ioc_base   = ioc_base;
 446         state->sel        = sel;
 447
 448         /*
 449          * Be on the safe side - disable interrupts
 450          */
 451         icside_irqdisable_arcin_v6(ec, 0);
 452
 453         icside_setup_ports(&hw[0], easi_base, &icside_cardinfo_v6_1, ec);
 454         icside_setup_ports(&hw[1], easi_base, &icside_cardinfo_v6_2, ec);
 455
 456         host = ide_host_alloc(&d, hws, 2);
 457         if (host == NULL)
 458                 return -ENODEV;
 459
 460         state->host = host;
 461
 462         ecard_set_drvdata(ec, state);
 463
 464         if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) {
 465                 d.init_dma = icside_dma_init;
 466                 d.port_ops = &icside_v6_port_ops;
 467                 d.dma_ops = NULL;
 468         }
 469
 470         ret = ide_host_register(host, &d, hws);
 471         if (ret)
 472                 goto err_free;
 473
 474         return 0;
 475 err_free:
 476         ide_host_free(host);
 477         if (d.dma_ops)
 478                 free_dma(ec->dma);
 479         ecard_set_drvdata(ec, NULL);
 480 out:
 481         return ret;
 482 }
 483
 484 static int __devinit
 485 icside_probe(struct expansion_card *ec, const struct ecard_id *id)
 486 {
 487         struct icside_state *state;
 488         void __iomem *idmem;
 489         int ret;
 490
 491         ret = ecard_request_resources(ec);
 492         if (ret)
 493                 goto out;
 494
 495         state = kzalloc(sizeof(struct icside_state), GFP_KERNEL);
 496         if (!state) {
 497                 ret = -ENOMEM;
 498                 goto release;
 499         }
 500
 501         state->type     = ICS_TYPE_NOTYPE;
 502
 503         idmem = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
 504         if (idmem) {
 505                 unsigned int type;
 506
 507                 type = readb(idmem + ICS_IDENT_OFFSET) & 1;
 508                 type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1;
 509                 type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2;
 510                 type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3;
 511                 ecardm_iounmap(ec, idmem);
 512
 513                 state->type = type;
 514         }
 515
 516         switch (state->type) {
 517         case ICS_TYPE_A3IN:
 518                 dev_warn(&ec->dev, "A3IN unsupported\n");
 519                 ret = -ENODEV;
 520                 break;
 521
 522         case ICS_TYPE_A3USER:
 523                 dev_warn(&ec->dev, "A3USER unsupported\n");
 524                 ret = -ENODEV;
 525                 break;
 526
 527         case ICS_TYPE_V5:
 528                 ret = icside_register_v5(state, ec);
 529                 break;
 530
 531         case ICS_TYPE_V6:
 532                 ret = icside_register_v6(state, ec);
 533                 break;
 534
 535         default:
 536                 dev_warn(&ec->dev, "unknown interface type\n");
 537                 ret = -ENODEV;
 538                 break;
 539         }
 540
 541         if (ret == 0)
 542                 goto out;
 543
 544         kfree(state);
 545  release:
 546         ecard_release_resources(ec);
 547  out:
 548         return ret;
 549 }
 550
 551 static void __devexit icside_remove(struct expansion_card *ec)
 552 {
 553         struct icside_state *state = ecard_get_drvdata(ec);
 554
 555         switch (state->type) {
 556         case ICS_TYPE_V5:
 557                 /* FIXME: tell IDE to stop using the interface */
 558
 559                 /* Disable interrupts */
 560                 icside_irqdisable_arcin_v5(ec, 0);
 561                 break;
 562
 563         case ICS_TYPE_V6:
 564                 /* FIXME: tell IDE to stop using the interface */
 565                 if (ec->dma != NO_DMA)
 566                         free_dma(ec->dma);
 567
 568                 /* Disable interrupts */
 569                 icside_irqdisable_arcin_v6(ec, 0);
 570
 571                 /* Reset the ROM pointer/EASI selection */
 572                 writeb(0, state->ioc_base);
 573                 break;
 574         }
 575
 576         ecard_set_drvdata(ec, NULL);
 577
 578         kfree(state);
 579         ecard_release_resources(ec);
 580 }
 581
 582 static void icside_shutdown(struct expansion_card *ec)
 583 {
 584         struct icside_state *state = ecard_get_drvdata(ec);
 585         unsigned long flags;
 586
 587         /*
 588          * Disable interrupts from this card.  We need to do
 589          * this before disabling EASI since we may be accessing
 590          * this register via that region.
 591          */
 592         local_irq_save(flags);
 593         ec->ops->irqdisable(ec, 0);
 594         local_irq_restore(flags);
 595
 596         /*
 597          * Reset the ROM pointer so that we can read the ROM
 598          * after a soft reboot.  This also disables access to
 599          * the IDE taskfile via the EASI region.
 600          */
 601         if (state->ioc_base)
 602                 writeb(0, state->ioc_base);
 603 }
 604
 605 static const struct ecard_id icside_ids[] = {
 606         { MANU_ICS,  PROD_ICS_IDE  },
 607         { MANU_ICS2, PROD_ICS2_IDE },
 608         { 0xffff, 0xffff }
 609 };
 610
 611 static struct ecard_driver icside_driver = {
 612         .probe          = icside_probe,
 613         .remove         = __devexit_p(icside_remove),
 614         .shutdown       = icside_shutdown,
 615         .id_table       = icside_ids,
 616         .drv = {
 617                 .name   = "icside",
 618         },
 619 };
 620
 621 static int __init icside_init(void)
 622 {
 623         return ecard_register_driver(&icside_driver);
 624 }
 625
 626 static void __exit icside_exit(void)
 627 {
 628         ecard_remove_driver(&icside_driver);
 629 }
 630
 631 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 632 MODULE_LICENSE("GPL");
 633 MODULE_DESCRIPTION("ICS IDE driver");
 634
 635 module_init(icside_init);
 636 module_exit(icside_exit);