1// SPDX-License-Identifier: GPL-2.0-only 2#include <linux/kernel.h> 3#include <linux/module.h> 4#include <linux/init.h> 5#include <linux/blkdev.h> 6#include <linux/gfp.h> 7#include <scsi/scsi_host.h> 8#include <linux/ata.h> 9#include <linux/libata.h> 10 11#include <asm/dma.h> 12#include <asm/ecard.h> 13 14#define DRV_NAME "pata_icside" 15 16#define ICS_IDENT_OFFSET 0x2280 17 18#define ICS_ARCIN_V5_INTRSTAT 0x0000 19#define ICS_ARCIN_V5_INTROFFSET 0x0004 20 21#define ICS_ARCIN_V6_INTROFFSET_1 0x2200 22#define ICS_ARCIN_V6_INTRSTAT_1 0x2290 23#define ICS_ARCIN_V6_INTROFFSET_2 0x3200 24#define ICS_ARCIN_V6_INTRSTAT_2 0x3290 25 26struct portinfo { 27 unsigned int dataoffset; 28 unsigned int ctrloffset; 29 unsigned int stepping; 30}; 31 32static const struct portinfo pata_icside_portinfo_v5 = { 33 .dataoffset = 0x2800, 34 .ctrloffset = 0x2b80, 35 .stepping = 6, 36}; 37 38static const struct portinfo pata_icside_portinfo_v6_1 = { 39 .dataoffset = 0x2000, 40 .ctrloffset = 0x2380, 41 .stepping = 6, 42}; 43 44static const struct portinfo pata_icside_portinfo_v6_2 = { 45 .dataoffset = 0x3000, 46 .ctrloffset = 0x3380, 47 .stepping = 6, 48}; 49 50struct pata_icside_state { 51 void __iomem *irq_port; 52 void __iomem *ioc_base; 53 unsigned int type; 54 unsigned int dma; 55 struct { 56 u8 port_sel; 57 u8 disabled; 58 unsigned int speed[ATA_MAX_DEVICES]; 59 } port[2]; 60}; 61 62struct pata_icside_info { 63 struct pata_icside_state *state; 64 struct expansion_card *ec; 65 void __iomem *base; 66 void __iomem *irqaddr; 67 unsigned int irqmask; 68 const expansioncard_ops_t *irqops; 69 unsigned int mwdma_mask; 70 unsigned int nr_ports; 71 const struct portinfo *port[2]; 72 unsigned long raw_base; 73 unsigned long raw_ioc_base; 74}; 75 76#define ICS_TYPE_A3IN 0 77#define ICS_TYPE_A3USER 1 78#define ICS_TYPE_V6 3 79#define ICS_TYPE_V5 15 80#define ICS_TYPE_NOTYPE ((unsigned int)-1) 81 82/* ---------------- Version 5 PCB Support Functions --------------------- */ 83/* Prototype: pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr) 84 * Purpose : enable interrupts from card 85 */ 86static void pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr) 87{ 88 struct pata_icside_state *state = ec->irq_data; 89 90 writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET); 91} 92 93/* Prototype: pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr) 94 * Purpose : disable interrupts from card 95 */ 96static void pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr) 97{ 98 struct pata_icside_state *state = ec->irq_data; 99 100 readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET); 101} 102 103static const expansioncard_ops_t pata_icside_ops_arcin_v5 = { 104 .irqenable = pata_icside_irqenable_arcin_v5, 105 .irqdisable = pata_icside_irqdisable_arcin_v5, 106}; 107 108 109/* ---------------- Version 6 PCB Support Functions --------------------- */ 110/* Prototype: pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr) 111 * Purpose : enable interrupts from card 112 */ 113static void pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr) 114{ 115 struct pata_icside_state *state = ec->irq_data; 116 void __iomem *base = state->irq_port; 117 118 if (!state->port[0].disabled) 119 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1); 120 if (!state->port[1].disabled) 121 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2); 122} 123 124/* Prototype: pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr) 125 * Purpose : disable interrupts from card 126 */ 127static void pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr) 128{ 129 struct pata_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: pata_icside_irqprobe(struct expansion_card *ec) 136 * Purpose : detect an active interrupt from card 137 */ 138static int pata_icside_irqpending_arcin_v6(struct expansion_card *ec) 139{ 140 struct pata_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 146static const expansioncard_ops_t pata_icside_ops_arcin_v6 = { 147 .irqenable = pata_icside_irqenable_arcin_v6, 148 .irqdisable = pata_icside_irqdisable_arcin_v6, 149 .irqpending = pata_icside_irqpending_arcin_v6, 150}; 151 152 153/* 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 (200) 250 (550) 437 (750) 174 * C 125 (125) 125 (375) 250 (500) 175 * D 62 (50) 125 (375) 187 (425) 176 * 177 * (figures in brackets are actual measured timings on DIOR/DIOW) 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 */ 188static void pata_icside_set_dmamode(struct ata_port *ap, struct ata_device *adev) 189{ 190 struct pata_icside_state *state = ap->host->private_data; 191 struct ata_timing t; 192 unsigned int cycle; 193 char iomd_type; 194 195 /* 196 * DMA is based on a 16MHz clock 197 */ 198 if (ata_timing_compute(adev, adev->dma_mode, &t, 1000, 1)) 199 return; 200 201 /* 202 * Choose the IOMD cycle timing which ensure that the interface 203 * satisfies the measured active, recovery and cycle times. 204 */ 205 if (t.active <= 50 && t.recover <= 375 && t.cycle <= 425) { 206 iomd_type = 'D'; 207 cycle = 187; 208 } else if (t.active <= 125 && t.recover <= 375 && t.cycle <= 500) { 209 iomd_type = 'C'; 210 cycle = 250; 211 } else if (t.active <= 200 && t.recover <= 550 && t.cycle <= 750) { 212 iomd_type = 'B'; 213 cycle = 437; 214 } else { 215 iomd_type = 'A'; 216 cycle = 562; 217 } 218 219 ata_dev_info(adev, "timings: act %dns rec %dns cyc %dns (%c)\n", 220 t.active, t.recover, t.cycle, iomd_type); 221 222 state->port[ap->port_no].speed[adev->devno] = cycle; 223} 224 225static void pata_icside_bmdma_setup(struct ata_queued_cmd *qc) 226{ 227 struct ata_port *ap = qc->ap; 228 struct pata_icside_state *state = ap->host->private_data; 229 unsigned int write = qc->tf.flags & ATA_TFLAG_WRITE; 230 231 /* 232 * We are simplex; BUG if we try to fiddle with DMA 233 * while it's active. 234 */ 235 BUG_ON(dma_channel_active(state->dma)); 236 237 /* 238 * Route the DMA signals to the correct interface 239 */ 240 writeb(state->port[ap->port_no].port_sel, state->ioc_base); 241 242 set_dma_speed(state->dma, state->port[ap->port_no].speed[qc->dev->devno]); 243 set_dma_sg(state->dma, qc->sg, qc->n_elem); 244 set_dma_mode(state->dma, write ? DMA_MODE_WRITE : DMA_MODE_READ); 245 246 /* issue r/w command */ 247 ap->ops->sff_exec_command(ap, &qc->tf); 248} 249 250static void pata_icside_bmdma_start(struct ata_queued_cmd *qc) 251{ 252 struct ata_port *ap = qc->ap; 253 struct pata_icside_state *state = ap->host->private_data; 254 255 BUG_ON(dma_channel_active(state->dma)); 256 enable_dma(state->dma); 257} 258 259static void pata_icside_bmdma_stop(struct ata_queued_cmd *qc) 260{ 261 struct ata_port *ap = qc->ap; 262 struct pata_icside_state *state = ap->host->private_data; 263 264 disable_dma(state->dma); 265 266 /* see ata_bmdma_stop */ 267 ata_sff_dma_pause(ap); 268} 269 270static u8 pata_icside_bmdma_status(struct ata_port *ap) 271{ 272 struct pata_icside_state *state = ap->host->private_data; 273 void __iomem *irq_port; 274 275 irq_port = state->irq_port + (ap->port_no ? ICS_ARCIN_V6_INTRSTAT_2 : 276 ICS_ARCIN_V6_INTRSTAT_1); 277 278 return readb(irq_port) & 1 ? ATA_DMA_INTR : 0; 279} 280 281static int icside_dma_init(struct pata_icside_info *info) 282{ 283 struct pata_icside_state *state = info->state; 284 struct expansion_card *ec = info->ec; 285 int i; 286 287 for (i = 0; i < ATA_MAX_DEVICES; i++) { 288 state->port[0].speed[i] = 480; 289 state->port[1].speed[i] = 480; 290 } 291 292 if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) { 293 state->dma = ec->dma; 294 info->mwdma_mask = ATA_MWDMA2; 295 } 296 297 return 0; 298} 299 300 301static const struct scsi_host_template pata_icside_sht = { 302 ATA_BASE_SHT(DRV_NAME), 303 .sg_tablesize = SG_MAX_SEGMENTS, 304 .dma_boundary = IOMD_DMA_BOUNDARY, 305}; 306 307static void pata_icside_postreset(struct ata_link *link, unsigned int *classes) 308{ 309 struct ata_port *ap = link->ap; 310 struct pata_icside_state *state = ap->host->private_data; 311 312 if (classes[0] != ATA_DEV_NONE || classes[1] != ATA_DEV_NONE) 313 return ata_sff_postreset(link, classes); 314 315 state->port[ap->port_no].disabled = 1; 316 317 if (state->type == ICS_TYPE_V6) { 318 /* 319 * Disable interrupts from this port, otherwise we 320 * receive spurious interrupts from the floating 321 * interrupt line. 322 */ 323 void __iomem *irq_port = state->irq_port + 324 (ap->port_no ? ICS_ARCIN_V6_INTROFFSET_2 : ICS_ARCIN_V6_INTROFFSET_1); 325 readb(irq_port); 326 } 327} 328 329static struct ata_port_operations pata_icside_port_ops = { 330 .inherits = &ata_bmdma_port_ops, 331 /* no need to build any PRD tables for DMA */ 332 .qc_prep = ata_noop_qc_prep, 333 .sff_data_xfer = ata_sff_data_xfer32, 334 .bmdma_setup = pata_icside_bmdma_setup, 335 .bmdma_start = pata_icside_bmdma_start, 336 .bmdma_stop = pata_icside_bmdma_stop, 337 .bmdma_status = pata_icside_bmdma_status, 338 339 .cable_detect = ata_cable_40wire, 340 .set_dmamode = pata_icside_set_dmamode, 341 .postreset = pata_icside_postreset, 342 343 .port_start = ATA_OP_NULL, /* don't need PRD table */ 344}; 345 346static void pata_icside_setup_ioaddr(struct ata_port *ap, void __iomem *base, 347 struct pata_icside_info *info, 348 const struct portinfo *port) 349{ 350 struct ata_ioports *ioaddr = &ap->ioaddr; 351 void __iomem *cmd = base + port->dataoffset; 352 353 ioaddr->cmd_addr = cmd; 354 ioaddr->data_addr = cmd + (ATA_REG_DATA << port->stepping); 355 ioaddr->error_addr = cmd + (ATA_REG_ERR << port->stepping); 356 ioaddr->feature_addr = cmd + (ATA_REG_FEATURE << port->stepping); 357 ioaddr->nsect_addr = cmd + (ATA_REG_NSECT << port->stepping); 358 ioaddr->lbal_addr = cmd + (ATA_REG_LBAL << port->stepping); 359 ioaddr->lbam_addr = cmd + (ATA_REG_LBAM << port->stepping); 360 ioaddr->lbah_addr = cmd + (ATA_REG_LBAH << port->stepping); 361 ioaddr->device_addr = cmd + (ATA_REG_DEVICE << port->stepping); 362 ioaddr->status_addr = cmd + (ATA_REG_STATUS << port->stepping); 363 ioaddr->command_addr = cmd + (ATA_REG_CMD << port->stepping); 364 365 ioaddr->ctl_addr = base + port->ctrloffset; 366 ioaddr->altstatus_addr = ioaddr->ctl_addr; 367 368 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", 369 info->raw_base + port->dataoffset, 370 info->raw_base + port->ctrloffset); 371 372 if (info->raw_ioc_base) 373 ata_port_desc(ap, "iocbase 0x%lx", info->raw_ioc_base); 374} 375 376static int pata_icside_register_v5(struct pata_icside_info *info) 377{ 378 struct pata_icside_state *state = info->state; 379 void __iomem *base; 380 381 base = ecardm_iomap(info->ec, ECARD_RES_MEMC, 0, 0); 382 if (!base) 383 return -ENOMEM; 384 385 state->irq_port = base; 386 387 info->base = base; 388 info->irqaddr = base + ICS_ARCIN_V5_INTRSTAT; 389 info->irqmask = 1; 390 info->irqops = &pata_icside_ops_arcin_v5; 391 info->nr_ports = 1; 392 info->port[0] = &pata_icside_portinfo_v5; 393 394 info->raw_base = ecard_resource_start(info->ec, ECARD_RES_MEMC); 395 396 return 0; 397} 398 399static int pata_icside_register_v6(struct pata_icside_info *info) 400{ 401 struct pata_icside_state *state = info->state; 402 struct expansion_card *ec = info->ec; 403 void __iomem *ioc_base, *easi_base; 404 unsigned int sel = 0; 405 406 ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 407 if (!ioc_base) 408 return -ENOMEM; 409 410 easi_base = ioc_base; 411 412 if (ecard_resource_flags(ec, ECARD_RES_EASI)) { 413 easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0); 414 if (!easi_base) 415 return -ENOMEM; 416 417 /* 418 * Enable access to the EASI region. 419 */ 420 sel = 1 << 5; 421 } 422 423 writeb(sel, ioc_base); 424 425 state->irq_port = easi_base; 426 state->ioc_base = ioc_base; 427 state->port[0].port_sel = sel; 428 state->port[1].port_sel = sel | 1; 429 430 info->base = easi_base; 431 info->irqops = &pata_icside_ops_arcin_v6; 432 info->nr_ports = 2; 433 info->port[0] = &pata_icside_portinfo_v6_1; 434 info->port[1] = &pata_icside_portinfo_v6_2; 435 436 info->raw_base = ecard_resource_start(ec, ECARD_RES_EASI); 437 info->raw_ioc_base = ecard_resource_start(ec, ECARD_RES_IOCFAST); 438 439 return icside_dma_init(info); 440} 441 442static int pata_icside_add_ports(struct pata_icside_info *info) 443{ 444 struct expansion_card *ec = info->ec; 445 struct ata_host *host; 446 int i; 447 448 if (info->irqaddr) { 449 ec->irqaddr = info->irqaddr; 450 ec->irqmask = info->irqmask; 451 } 452 if (info->irqops) 453 ecard_setirq(ec, info->irqops, info->state); 454 455 /* 456 * Be on the safe side - disable interrupts 457 */ 458 ec->ops->irqdisable(ec, ec->irq); 459 460 host = ata_host_alloc(&ec->dev, info->nr_ports); 461 if (!host) 462 return -ENOMEM; 463 464 host->private_data = info->state; 465 host->flags = ATA_HOST_SIMPLEX; 466 467 for (i = 0; i < info->nr_ports; i++) { 468 struct ata_port *ap = host->ports[i]; 469 470 ap->pio_mask = ATA_PIO4; 471 ap->mwdma_mask = info->mwdma_mask; 472 ap->flags |= ATA_FLAG_SLAVE_POSS; 473 ap->ops = &pata_icside_port_ops; 474 475 pata_icside_setup_ioaddr(ap, info->base, info, info->port[i]); 476 } 477 478 return ata_host_activate(host, ec->irq, ata_bmdma_interrupt, 0, 479 &pata_icside_sht); 480} 481 482static int pata_icside_probe(struct expansion_card *ec, 483 const struct ecard_id *id) 484{ 485 struct pata_icside_state *state; 486 struct pata_icside_info info; 487 void __iomem *idmem; 488 int ret; 489 490 ret = ecard_request_resources(ec); 491 if (ret) 492 goto out; 493 494 state = devm_kzalloc(&ec->dev, sizeof(*state), GFP_KERNEL); 495 if (!state) { 496 ret = -ENOMEM; 497 goto release; 498 } 499 500 state->type = ICS_TYPE_NOTYPE; 501 state->dma = NO_DMA; 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 memset(&info, 0, sizeof(info)); 517 info.state = state; 518 info.ec = ec; 519 520 switch (state->type) { 521 case ICS_TYPE_A3IN: 522 dev_warn(&ec->dev, "A3IN unsupported\n"); 523 ret = -ENODEV; 524 break; 525 526 case ICS_TYPE_A3USER: 527 dev_warn(&ec->dev, "A3USER unsupported\n"); 528 ret = -ENODEV; 529 break; 530 531 case ICS_TYPE_V5: 532 ret = pata_icside_register_v5(&info); 533 break; 534 535 case ICS_TYPE_V6: 536 ret = pata_icside_register_v6(&info); 537 break; 538 539 default: 540 dev_warn(&ec->dev, "unknown interface type\n"); 541 ret = -ENODEV; 542 break; 543 } 544 545 if (ret == 0) 546 ret = pata_icside_add_ports(&info); 547 548 if (ret == 0) 549 goto out; 550 551 release: 552 ecard_release_resources(ec); 553 out: 554 return ret; 555} 556 557static void pata_icside_shutdown(struct expansion_card *ec) 558{ 559 struct ata_host *host = ecard_get_drvdata(ec); 560 unsigned long flags; 561 562 /* 563 * Disable interrupts from this card. We need to do 564 * this before disabling EASI since we may be accessing 565 * this register via that region. 566 */ 567 local_irq_save(flags); 568 ec->ops->irqdisable(ec, ec->irq); 569 local_irq_restore(flags); 570 571 /* 572 * Reset the ROM pointer so that we can read the ROM 573 * after a soft reboot. This also disables access to 574 * the IDE taskfile via the EASI region. 575 */ 576 if (host) { 577 struct pata_icside_state *state = host->private_data; 578 if (state->ioc_base) 579 writeb(0, state->ioc_base); 580 } 581} 582 583static void pata_icside_remove(struct expansion_card *ec) 584{ 585 struct ata_host *host = ecard_get_drvdata(ec); 586 struct pata_icside_state *state = host->private_data; 587 588 ata_host_detach(host); 589 590 pata_icside_shutdown(ec); 591 592 /* 593 * don't NULL out the drvdata - devres/libata wants it 594 * to free the ata_host structure. 595 */ 596 if (state->dma != NO_DMA) 597 free_dma(state->dma); 598 599 ecard_release_resources(ec); 600} 601 602static const struct ecard_id pata_icside_ids[] = { 603 { MANU_ICS, PROD_ICS_IDE }, 604 { MANU_ICS2, PROD_ICS2_IDE }, 605 { 0xffff, 0xffff } 606}; 607 608static struct ecard_driver pata_icside_driver = { 609 .probe = pata_icside_probe, 610 .remove = pata_icside_remove, 611 .shutdown = pata_icside_shutdown, 612 .id_table = pata_icside_ids, 613 .drv = { 614 .name = DRV_NAME, 615 }, 616}; 617 618static int __init pata_icside_init(void) 619{ 620 return ecard_register_driver(&pata_icside_driver); 621} 622 623static void __exit pata_icside_exit(void) 624{ 625 ecard_remove_driver(&pata_icside_driver); 626} 627 628MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 629MODULE_LICENSE("GPL"); 630MODULE_DESCRIPTION("ICS PATA driver"); 631 632module_init(pata_icside_init); 633module_exit(pata_icside_exit); 634