icside.c revision f7ef12482b17a015906cf74afe655e691b5fa2cb
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 43struct cardinfo { 44 unsigned int dataoffset; 45 unsigned int ctrloffset; 46 unsigned int stepping; 47}; 48 49static 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 55static 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 61static 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 67struct icside_state { 68 unsigned int channel; 69 unsigned int enabled; 70 void __iomem *irq_port; 71 void __iomem *ioc_base; 72 unsigned int sel; 73 unsigned int type; 74 struct ide_host *host; 75}; 76 77#define ICS_TYPE_A3IN 0 78#define ICS_TYPE_A3USER 1 79#define ICS_TYPE_V6 3 80#define ICS_TYPE_V5 15 81#define ICS_TYPE_NOTYPE ((unsigned int)-1) 82 83/* ---------------- Version 5 PCB Support Functions --------------------- */ 84/* Prototype: icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr) 85 * Purpose : enable interrupts from card 86 */ 87static void icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr) 88{ 89 struct icside_state *state = ec->irq_data; 90 91 writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET); 92} 93 94/* Prototype: icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr) 95 * Purpose : disable interrupts from card 96 */ 97static void icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr) 98{ 99 struct icside_state *state = ec->irq_data; 100 101 readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET); 102} 103 104static const expansioncard_ops_t icside_ops_arcin_v5 = { 105 .irqenable = icside_irqenable_arcin_v5, 106 .irqdisable = icside_irqdisable_arcin_v5, 107}; 108 109 110/* ---------------- Version 6 PCB Support Functions --------------------- */ 111/* Prototype: icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr) 112 * Purpose : enable interrupts from card 113 */ 114static void icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr) 115{ 116 struct icside_state *state = ec->irq_data; 117 void __iomem *base = state->irq_port; 118 119 state->enabled = 1; 120 121 switch (state->channel) { 122 case 0: 123 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1); 124 readb(base + ICS_ARCIN_V6_INTROFFSET_2); 125 break; 126 case 1: 127 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2); 128 readb(base + ICS_ARCIN_V6_INTROFFSET_1); 129 break; 130 } 131} 132 133/* Prototype: icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr) 134 * Purpose : disable interrupts from card 135 */ 136static void icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr) 137{ 138 struct icside_state *state = ec->irq_data; 139 140 state->enabled = 0; 141 142 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1); 143 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2); 144} 145 146/* Prototype: icside_irqprobe(struct expansion_card *ec) 147 * Purpose : detect an active interrupt from card 148 */ 149static int icside_irqpending_arcin_v6(struct expansion_card *ec) 150{ 151 struct icside_state *state = ec->irq_data; 152 153 return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 || 154 readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1; 155} 156 157static const expansioncard_ops_t icside_ops_arcin_v6 = { 158 .irqenable = icside_irqenable_arcin_v6, 159 .irqdisable = icside_irqdisable_arcin_v6, 160 .irqpending = icside_irqpending_arcin_v6, 161}; 162 163/* 164 * Handle routing of interrupts. This is called before 165 * we write the command to the drive. 166 */ 167static void icside_maskproc(ide_drive_t *drive, int mask) 168{ 169 ide_hwif_t *hwif = drive->hwif; 170 struct expansion_card *ec = ECARD_DEV(hwif->dev); 171 struct icside_state *state = ecard_get_drvdata(ec); 172 unsigned long flags; 173 174 local_irq_save(flags); 175 176 state->channel = hwif->channel; 177 178 if (state->enabled && !mask) { 179 switch (hwif->channel) { 180 case 0: 181 writeb(0, state->irq_port + ICS_ARCIN_V6_INTROFFSET_1); 182 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2); 183 break; 184 case 1: 185 writeb(0, state->irq_port + ICS_ARCIN_V6_INTROFFSET_2); 186 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1); 187 break; 188 } 189 } else { 190 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2); 191 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1); 192 } 193 194 local_irq_restore(flags); 195} 196 197static const struct ide_port_ops icside_v6_no_dma_port_ops = { 198 .maskproc = icside_maskproc, 199}; 200 201#ifdef CONFIG_BLK_DEV_IDEDMA_ICS 202/* 203 * SG-DMA support. 204 * 205 * Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers. 206 * There is only one DMA controller per card, which means that only 207 * one drive can be accessed at one time. NOTE! We do not enforce that 208 * here, but we rely on the main IDE driver spotting that both 209 * interfaces use the same IRQ, which should guarantee this. 210 */ 211 212/* 213 * Configure the IOMD to give the appropriate timings for the transfer 214 * mode being requested. We take the advice of the ATA standards, and 215 * calculate the cycle time based on the transfer mode, and the EIDE 216 * MW DMA specs that the drive provides in the IDENTIFY command. 217 * 218 * We have the following IOMD DMA modes to choose from: 219 * 220 * Type Active Recovery Cycle 221 * A 250 (250) 312 (550) 562 (800) 222 * B 187 250 437 223 * C 125 (125) 125 (375) 250 (500) 224 * D 62 125 187 225 * 226 * (figures in brackets are actual measured timings) 227 * 228 * However, we also need to take care of the read/write active and 229 * recovery timings: 230 * 231 * Read Write 232 * Mode Active -- Recovery -- Cycle IOMD type 233 * MW0 215 50 215 480 A 234 * MW1 80 50 50 150 C 235 * MW2 70 25 25 120 C 236 */ 237static void icside_set_dma_mode(ide_drive_t *drive, const u8 xfer_mode) 238{ 239 int cycle_time, use_dma_info = 0; 240 241 switch (xfer_mode) { 242 case XFER_MW_DMA_2: 243 cycle_time = 250; 244 use_dma_info = 1; 245 break; 246 247 case XFER_MW_DMA_1: 248 cycle_time = 250; 249 use_dma_info = 1; 250 break; 251 252 case XFER_MW_DMA_0: 253 cycle_time = 480; 254 break; 255 256 case XFER_SW_DMA_2: 257 case XFER_SW_DMA_1: 258 case XFER_SW_DMA_0: 259 cycle_time = 480; 260 break; 261 } 262 263 /* 264 * If we're going to be doing MW_DMA_1 or MW_DMA_2, we should 265 * take care to note the values in the ID... 266 */ 267 if (use_dma_info && drive->id[ATA_ID_EIDE_DMA_TIME] > cycle_time) 268 cycle_time = drive->id[ATA_ID_EIDE_DMA_TIME]; 269 270 drive->drive_data = cycle_time; 271 272 printk("%s: %s selected (peak %dMB/s)\n", drive->name, 273 ide_xfer_verbose(xfer_mode), 2000 / drive->drive_data); 274} 275 276static const struct ide_port_ops icside_v6_port_ops = { 277 .set_dma_mode = icside_set_dma_mode, 278 .maskproc = icside_maskproc, 279}; 280 281static void icside_dma_host_set(ide_drive_t *drive, int on) 282{ 283} 284 285static int icside_dma_end(ide_drive_t *drive) 286{ 287 ide_hwif_t *hwif = drive->hwif; 288 struct expansion_card *ec = ECARD_DEV(hwif->dev); 289 290 drive->waiting_for_dma = 0; 291 292 disable_dma(ec->dma); 293 294 /* Teardown mappings after DMA has completed. */ 295 ide_destroy_dmatable(drive); 296 297 return get_dma_residue(ec->dma) != 0; 298} 299 300static void icside_dma_start(ide_drive_t *drive) 301{ 302 ide_hwif_t *hwif = drive->hwif; 303 struct expansion_card *ec = ECARD_DEV(hwif->dev); 304 305 /* We can not enable DMA on both channels simultaneously. */ 306 BUG_ON(dma_channel_active(ec->dma)); 307 enable_dma(ec->dma); 308} 309 310static int icside_dma_setup(ide_drive_t *drive) 311{ 312 ide_hwif_t *hwif = drive->hwif; 313 struct expansion_card *ec = ECARD_DEV(hwif->dev); 314 struct icside_state *state = ecard_get_drvdata(ec); 315 struct request *rq = hwif->rq; 316 unsigned int dma_mode; 317 318 if (rq_data_dir(rq)) 319 dma_mode = DMA_MODE_WRITE; 320 else 321 dma_mode = DMA_MODE_READ; 322 323 /* 324 * We can not enable DMA on both channels. 325 */ 326 BUG_ON(dma_channel_active(ec->dma)); 327 328 hwif->sg_nents = ide_build_sglist(drive, rq); 329 if (hwif->sg_nents == 0) { 330 ide_map_sg(drive, rq); 331 return 1; 332 } 333 334 /* 335 * Ensure that we have the right interrupt routed. 336 */ 337 icside_maskproc(drive, 0); 338 339 /* 340 * Route the DMA signals to the correct interface. 341 */ 342 writeb(state->sel | hwif->channel, state->ioc_base); 343 344 /* 345 * Select the correct timing for this drive. 346 */ 347 set_dma_speed(ec->dma, drive->drive_data); 348 349 /* 350 * Tell the DMA engine about the SG table and 351 * data direction. 352 */ 353 set_dma_sg(ec->dma, hwif->sg_table, hwif->sg_nents); 354 set_dma_mode(ec->dma, dma_mode); 355 356 drive->waiting_for_dma = 1; 357 358 return 0; 359} 360 361static void icside_dma_exec_cmd(ide_drive_t *drive, u8 cmd) 362{ 363 /* issue cmd to drive */ 364 ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD, NULL); 365} 366 367static int icside_dma_test_irq(ide_drive_t *drive) 368{ 369 ide_hwif_t *hwif = drive->hwif; 370 struct expansion_card *ec = ECARD_DEV(hwif->dev); 371 struct icside_state *state = ecard_get_drvdata(ec); 372 373 return readb(state->irq_port + 374 (hwif->channel ? 375 ICS_ARCIN_V6_INTRSTAT_2 : 376 ICS_ARCIN_V6_INTRSTAT_1)) & 1; 377} 378 379static int icside_dma_init(ide_hwif_t *hwif, const struct ide_port_info *d) 380{ 381 hwif->dmatable_cpu = NULL; 382 hwif->dmatable_dma = 0; 383 384 return 0; 385} 386 387static const struct ide_dma_ops icside_v6_dma_ops = { 388 .dma_host_set = icside_dma_host_set, 389 .dma_setup = icside_dma_setup, 390 .dma_exec_cmd = icside_dma_exec_cmd, 391 .dma_start = icside_dma_start, 392 .dma_end = icside_dma_end, 393 .dma_test_irq = icside_dma_test_irq, 394 .dma_timeout = ide_dma_timeout, 395 .dma_lost_irq = ide_dma_lost_irq, 396}; 397#else 398#define icside_v6_dma_ops NULL 399#endif 400 401static int icside_dma_off_init(ide_hwif_t *hwif, const struct ide_port_info *d) 402{ 403 return -EOPNOTSUPP; 404} 405 406static void icside_setup_ports(hw_regs_t *hw, void __iomem *base, 407 struct cardinfo *info, struct expansion_card *ec) 408{ 409 unsigned long port = (unsigned long)base + info->dataoffset; 410 411 hw->io_ports.data_addr = port; 412 hw->io_ports.error_addr = port + (1 << info->stepping); 413 hw->io_ports.nsect_addr = port + (2 << info->stepping); 414 hw->io_ports.lbal_addr = port + (3 << info->stepping); 415 hw->io_ports.lbam_addr = port + (4 << info->stepping); 416 hw->io_ports.lbah_addr = port + (5 << info->stepping); 417 hw->io_ports.device_addr = port + (6 << info->stepping); 418 hw->io_ports.status_addr = port + (7 << info->stepping); 419 hw->io_ports.ctl_addr = (unsigned long)base + info->ctrloffset; 420 421 hw->irq = ec->irq; 422 hw->dev = &ec->dev; 423 hw->chipset = ide_acorn; 424} 425 426static const struct ide_port_info icside_v5_port_info = { 427 .host_flags = IDE_HFLAG_NO_DMA, 428}; 429 430static int __devinit 431icside_register_v5(struct icside_state *state, struct expansion_card *ec) 432{ 433 void __iomem *base; 434 struct ide_host *host; 435 hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL }; 436 int ret; 437 438 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 439 if (!base) 440 return -ENOMEM; 441 442 state->irq_port = base; 443 444 ec->irqaddr = base + ICS_ARCIN_V5_INTRSTAT; 445 ec->irqmask = 1; 446 447 ecard_setirq(ec, &icside_ops_arcin_v5, state); 448 449 /* 450 * Be on the safe side - disable interrupts 451 */ 452 icside_irqdisable_arcin_v5(ec, 0); 453 454 icside_setup_ports(&hw, base, &icside_cardinfo_v5, ec); 455 456 host = ide_host_alloc(&icside_v5_port_info, hws); 457 if (host == NULL) 458 return -ENODEV; 459 460 state->host = host; 461 462 ecard_set_drvdata(ec, state); 463 464 ret = ide_host_register(host, &icside_v5_port_info, hws); 465 if (ret) 466 goto err_free; 467 468 return 0; 469err_free: 470 ide_host_free(host); 471 ecard_set_drvdata(ec, NULL); 472 return ret; 473} 474 475static const struct ide_port_info icside_v6_port_info __initdata = { 476 .init_dma = icside_dma_off_init, 477 .port_ops = &icside_v6_no_dma_port_ops, 478 .dma_ops = &icside_v6_dma_ops, 479 .host_flags = IDE_HFLAG_SERIALIZE | IDE_HFLAG_MMIO, 480 .mwdma_mask = ATA_MWDMA2, 481 .swdma_mask = ATA_SWDMA2, 482}; 483 484static int __devinit 485icside_register_v6(struct icside_state *state, struct expansion_card *ec) 486{ 487 void __iomem *ioc_base, *easi_base; 488 struct ide_host *host; 489 unsigned int sel = 0; 490 int ret; 491 hw_regs_t hw[2], *hws[] = { &hw[0], NULL, NULL, NULL }; 492 struct ide_port_info d = icside_v6_port_info; 493 494 ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 495 if (!ioc_base) { 496 ret = -ENOMEM; 497 goto out; 498 } 499 500 easi_base = ioc_base; 501 502 if (ecard_resource_flags(ec, ECARD_RES_EASI)) { 503 easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0); 504 if (!easi_base) { 505 ret = -ENOMEM; 506 goto out; 507 } 508 509 /* 510 * Enable access to the EASI region. 511 */ 512 sel = 1 << 5; 513 } 514 515 writeb(sel, ioc_base); 516 517 ecard_setirq(ec, &icside_ops_arcin_v6, state); 518 519 state->irq_port = easi_base; 520 state->ioc_base = ioc_base; 521 state->sel = sel; 522 523 /* 524 * Be on the safe side - disable interrupts 525 */ 526 icside_irqdisable_arcin_v6(ec, 0); 527 528 icside_setup_ports(&hw[0], easi_base, &icside_cardinfo_v6_1, ec); 529 icside_setup_ports(&hw[1], easi_base, &icside_cardinfo_v6_2, ec); 530 531 host = ide_host_alloc(&d, hws); 532 if (host == NULL) 533 return -ENODEV; 534 535 state->host = host; 536 537 ecard_set_drvdata(ec, state); 538 539 if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) { 540 d.init_dma = icside_dma_init; 541 d.port_ops = &icside_v6_port_ops; 542 d.dma_ops = NULL; 543 } 544 545 ret = ide_host_register(host, &d, hws); 546 if (ret) 547 goto err_free; 548 549 return 0; 550err_free: 551 ide_host_free(host); 552 if (d.dma_ops) 553 free_dma(ec->dma); 554 ecard_set_drvdata(ec, NULL); 555out: 556 return ret; 557} 558 559static int __devinit 560icside_probe(struct expansion_card *ec, const struct ecard_id *id) 561{ 562 struct icside_state *state; 563 void __iomem *idmem; 564 int ret; 565 566 ret = ecard_request_resources(ec); 567 if (ret) 568 goto out; 569 570 state = kzalloc(sizeof(struct icside_state), GFP_KERNEL); 571 if (!state) { 572 ret = -ENOMEM; 573 goto release; 574 } 575 576 state->type = ICS_TYPE_NOTYPE; 577 578 idmem = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 579 if (idmem) { 580 unsigned int type; 581 582 type = readb(idmem + ICS_IDENT_OFFSET) & 1; 583 type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1; 584 type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2; 585 type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3; 586 ecardm_iounmap(ec, idmem); 587 588 state->type = type; 589 } 590 591 switch (state->type) { 592 case ICS_TYPE_A3IN: 593 dev_warn(&ec->dev, "A3IN unsupported\n"); 594 ret = -ENODEV; 595 break; 596 597 case ICS_TYPE_A3USER: 598 dev_warn(&ec->dev, "A3USER unsupported\n"); 599 ret = -ENODEV; 600 break; 601 602 case ICS_TYPE_V5: 603 ret = icside_register_v5(state, ec); 604 break; 605 606 case ICS_TYPE_V6: 607 ret = icside_register_v6(state, ec); 608 break; 609 610 default: 611 dev_warn(&ec->dev, "unknown interface type\n"); 612 ret = -ENODEV; 613 break; 614 } 615 616 if (ret == 0) 617 goto out; 618 619 kfree(state); 620 release: 621 ecard_release_resources(ec); 622 out: 623 return ret; 624} 625 626static void __devexit icside_remove(struct expansion_card *ec) 627{ 628 struct icside_state *state = ecard_get_drvdata(ec); 629 630 switch (state->type) { 631 case ICS_TYPE_V5: 632 /* FIXME: tell IDE to stop using the interface */ 633 634 /* Disable interrupts */ 635 icside_irqdisable_arcin_v5(ec, 0); 636 break; 637 638 case ICS_TYPE_V6: 639 /* FIXME: tell IDE to stop using the interface */ 640 if (ec->dma != NO_DMA) 641 free_dma(ec->dma); 642 643 /* Disable interrupts */ 644 icside_irqdisable_arcin_v6(ec, 0); 645 646 /* Reset the ROM pointer/EASI selection */ 647 writeb(0, state->ioc_base); 648 break; 649 } 650 651 ecard_set_drvdata(ec, NULL); 652 653 kfree(state); 654 ecard_release_resources(ec); 655} 656 657static void icside_shutdown(struct expansion_card *ec) 658{ 659 struct icside_state *state = ecard_get_drvdata(ec); 660 unsigned long flags; 661 662 /* 663 * Disable interrupts from this card. We need to do 664 * this before disabling EASI since we may be accessing 665 * this register via that region. 666 */ 667 local_irq_save(flags); 668 ec->ops->irqdisable(ec, 0); 669 local_irq_restore(flags); 670 671 /* 672 * Reset the ROM pointer so that we can read the ROM 673 * after a soft reboot. This also disables access to 674 * the IDE taskfile via the EASI region. 675 */ 676 if (state->ioc_base) 677 writeb(0, state->ioc_base); 678} 679 680static const struct ecard_id icside_ids[] = { 681 { MANU_ICS, PROD_ICS_IDE }, 682 { MANU_ICS2, PROD_ICS2_IDE }, 683 { 0xffff, 0xffff } 684}; 685 686static struct ecard_driver icside_driver = { 687 .probe = icside_probe, 688 .remove = __devexit_p(icside_remove), 689 .shutdown = icside_shutdown, 690 .id_table = icside_ids, 691 .drv = { 692 .name = "icside", 693 }, 694}; 695 696static int __init icside_init(void) 697{ 698 return ecard_register_driver(&icside_driver); 699} 700 701static void __exit icside_exit(void) 702{ 703 ecard_remove_driver(&icside_driver); 704} 705 706MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 707MODULE_LICENSE("GPL"); 708MODULE_DESCRIPTION("ICS IDE driver"); 709 710module_init(icside_init); 711module_exit(icside_exit); 712