setup-pci.c revision 8c2eece50a368c7986bae0b3e52739558dd71b51
1/* 2 * Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org> 3 * Copyright (C) 1995-1998 Mark Lord 4 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz 5 * 6 * May be copied or modified under the terms of the GNU General Public License 7 */ 8 9#include <linux/types.h> 10#include <linux/kernel.h> 11#include <linux/pci.h> 12#include <linux/init.h> 13#include <linux/interrupt.h> 14#include <linux/ide.h> 15#include <linux/dma-mapping.h> 16 17#include <asm/io.h> 18 19/** 20 * ide_setup_pci_baseregs - place a PCI IDE controller native 21 * @dev: PCI device of interface to switch native 22 * @name: Name of interface 23 * 24 * We attempt to place the PCI interface into PCI native mode. If 25 * we succeed the BARs are ok and the controller is in PCI mode. 26 * Returns 0 on success or an errno code. 27 * 28 * FIXME: if we program the interface and then fail to set the BARS 29 * we don't switch it back to legacy mode. Do we actually care ?? 30 */ 31 32static int ide_setup_pci_baseregs(struct pci_dev *dev, const char *name) 33{ 34 u8 progif = 0; 35 36 /* 37 * Place both IDE interfaces into PCI "native" mode: 38 */ 39 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) || 40 (progif & 5) != 5) { 41 if ((progif & 0xa) != 0xa) { 42 printk(KERN_INFO "%s: device not capable of full " 43 "native PCI mode\n", name); 44 return -EOPNOTSUPP; 45 } 46 printk("%s: placing both ports into native PCI mode\n", name); 47 (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5); 48 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) || 49 (progif & 5) != 5) { 50 printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted " 51 "0x%04x, got 0x%04x\n", 52 name, progif|5, progif); 53 return -EOPNOTSUPP; 54 } 55 } 56 return 0; 57} 58 59#ifdef CONFIG_BLK_DEV_IDEDMA_PCI 60static void ide_pci_clear_simplex(unsigned long dma_base, const char *name) 61{ 62 u8 dma_stat = inb(dma_base + 2); 63 64 outb(dma_stat & 0x60, dma_base + 2); 65 dma_stat = inb(dma_base + 2); 66 if (dma_stat & 0x80) 67 printk(KERN_INFO "%s: simplex device: DMA forced\n", name); 68} 69 70/** 71 * ide_pci_dma_base - setup BMIBA 72 * @hwif: IDE interface 73 * @d: IDE port info 74 * 75 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space. 76 */ 77 78unsigned long ide_pci_dma_base(ide_hwif_t *hwif, const struct ide_port_info *d) 79{ 80 struct pci_dev *dev = to_pci_dev(hwif->dev); 81 unsigned long dma_base = 0; 82 83 if (hwif->host_flags & IDE_HFLAG_MMIO) 84 return hwif->dma_base; 85 86 if (hwif->mate && hwif->mate->dma_base) { 87 dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8); 88 } else { 89 u8 baridx = (d->host_flags & IDE_HFLAG_CS5520) ? 2 : 4; 90 91 dma_base = pci_resource_start(dev, baridx); 92 93 if (dma_base == 0) { 94 printk(KERN_ERR "%s: DMA base is invalid\n", d->name); 95 return 0; 96 } 97 } 98 99 if (hwif->channel) 100 dma_base += 8; 101 102 return dma_base; 103} 104EXPORT_SYMBOL_GPL(ide_pci_dma_base); 105 106int ide_pci_check_simplex(ide_hwif_t *hwif, const struct ide_port_info *d) 107{ 108 u8 dma_stat; 109 110 if (d->host_flags & (IDE_HFLAG_MMIO | IDE_HFLAG_CS5520)) 111 goto out; 112 113 if (d->host_flags & IDE_HFLAG_CLEAR_SIMPLEX) { 114 ide_pci_clear_simplex(hwif->dma_base, d->name); 115 goto out; 116 } 117 118 /* 119 * If the device claims "simplex" DMA, this means that only one of 120 * the two interfaces can be trusted with DMA at any point in time 121 * (so we should enable DMA only on one of the two interfaces). 122 * 123 * FIXME: At this point we haven't probed the drives so we can't make 124 * the appropriate decision. Really we should defer this problem until 125 * we tune the drive then try to grab DMA ownership if we want to be 126 * the DMA end. This has to be become dynamic to handle hot-plug. 127 */ 128 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif); 129 if ((dma_stat & 0x80) && hwif->mate && hwif->mate->dma_base) { 130 printk(KERN_INFO "%s: simplex device: DMA disabled\n", d->name); 131 return -1; 132 } 133out: 134 return 0; 135} 136EXPORT_SYMBOL_GPL(ide_pci_check_simplex); 137 138/* 139 * Set up BM-DMA capability (PnP BIOS should have done this) 140 */ 141int ide_pci_set_master(struct pci_dev *dev, const char *name) 142{ 143 u16 pcicmd; 144 145 pci_read_config_word(dev, PCI_COMMAND, &pcicmd); 146 147 if ((pcicmd & PCI_COMMAND_MASTER) == 0) { 148 pci_set_master(dev); 149 150 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || 151 (pcicmd & PCI_COMMAND_MASTER) == 0) { 152 printk(KERN_ERR "%s: error updating PCICMD on %s\n", 153 name, pci_name(dev)); 154 return -EIO; 155 } 156 } 157 158 return 0; 159} 160EXPORT_SYMBOL_GPL(ide_pci_set_master); 161#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */ 162 163void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d) 164{ 165 printk(KERN_INFO "%s: IDE controller (0x%04x:0x%04x rev 0x%02x) at " 166 " PCI slot %s\n", d->name, dev->vendor, dev->device, 167 dev->revision, pci_name(dev)); 168} 169EXPORT_SYMBOL_GPL(ide_setup_pci_noise); 170 171 172/** 173 * ide_pci_enable - do PCI enables 174 * @dev: PCI device 175 * @d: IDE port info 176 * 177 * Enable the IDE PCI device. We attempt to enable the device in full 178 * but if that fails then we only need IO space. The PCI code should 179 * have setup the proper resources for us already for controllers in 180 * legacy mode. 181 * 182 * Returns zero on success or an error code 183 */ 184 185static int ide_pci_enable(struct pci_dev *dev, const struct ide_port_info *d) 186{ 187 int ret, bars; 188 189 if (pci_enable_device(dev)) { 190 ret = pci_enable_device_io(dev); 191 if (ret < 0) { 192 printk(KERN_WARNING "%s: (ide_setup_pci_device:) " 193 "Could not enable device.\n", d->name); 194 goto out; 195 } 196 printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name); 197 } 198 199 /* 200 * assume all devices can do 32-bit DMA for now, we can add 201 * a DMA mask field to the struct ide_port_info if we need it 202 * (or let lower level driver set the DMA mask) 203 */ 204 ret = pci_set_dma_mask(dev, DMA_32BIT_MASK); 205 if (ret < 0) { 206 printk(KERN_ERR "%s: can't set dma mask\n", d->name); 207 goto out; 208 } 209 210 if (d->host_flags & IDE_HFLAG_SINGLE) 211 bars = (1 << 2) - 1; 212 else 213 bars = (1 << 4) - 1; 214 215 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) { 216 if (d->host_flags & IDE_HFLAG_CS5520) 217 bars |= (1 << 2); 218 else 219 bars |= (1 << 4); 220 } 221 222 ret = pci_request_selected_regions(dev, bars, d->name); 223 if (ret < 0) 224 printk(KERN_ERR "%s: can't reserve resources\n", d->name); 225out: 226 return ret; 227} 228 229/** 230 * ide_pci_configure - configure an unconfigured device 231 * @dev: PCI device 232 * @d: IDE port info 233 * 234 * Enable and configure the PCI device we have been passed. 235 * Returns zero on success or an error code. 236 */ 237 238static int ide_pci_configure(struct pci_dev *dev, const struct ide_port_info *d) 239{ 240 u16 pcicmd = 0; 241 /* 242 * PnP BIOS was *supposed* to have setup this device, but we 243 * can do it ourselves, so long as the BIOS has assigned an IRQ 244 * (or possibly the device is using a "legacy header" for IRQs). 245 * Maybe the user deliberately *disabled* the device, 246 * but we'll eventually ignore it again if no drives respond. 247 */ 248 if (ide_setup_pci_baseregs(dev, d->name) || 249 pci_write_config_word(dev, PCI_COMMAND, pcicmd | PCI_COMMAND_IO)) { 250 printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name); 251 return -ENODEV; 252 } 253 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) { 254 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name); 255 return -EIO; 256 } 257 if (!(pcicmd & PCI_COMMAND_IO)) { 258 printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name); 259 return -ENXIO; 260 } 261 return 0; 262} 263 264/** 265 * ide_pci_check_iomem - check a register is I/O 266 * @dev: PCI device 267 * @d: IDE port info 268 * @bar: BAR number 269 * 270 * Checks if a BAR is configured and points to MMIO space. If so, 271 * return an error code. Otherwise return 0 272 */ 273 274static int ide_pci_check_iomem(struct pci_dev *dev, const struct ide_port_info *d, 275 int bar) 276{ 277 ulong flags = pci_resource_flags(dev, bar); 278 279 /* Unconfigured ? */ 280 if (!flags || pci_resource_len(dev, bar) == 0) 281 return 0; 282 283 /* I/O space */ 284 if (flags & IORESOURCE_IO) 285 return 0; 286 287 /* Bad */ 288 return -EINVAL; 289} 290 291/** 292 * ide_hw_configure - configure a hw_regs_t instance 293 * @dev: PCI device holding interface 294 * @d: IDE port info 295 * @port: port number 296 * @irq: PCI IRQ 297 * @hw: hw_regs_t instance corresponding to this port 298 * 299 * Perform the initial set up for the hardware interface structure. This 300 * is done per interface port rather than per PCI device. There may be 301 * more than one port per device. 302 * 303 * Returns zero on success or an error code. 304 */ 305 306static int ide_hw_configure(struct pci_dev *dev, const struct ide_port_info *d, 307 unsigned int port, int irq, hw_regs_t *hw) 308{ 309 unsigned long ctl = 0, base = 0; 310 311 if ((d->host_flags & IDE_HFLAG_ISA_PORTS) == 0) { 312 if (ide_pci_check_iomem(dev, d, 2 * port) || 313 ide_pci_check_iomem(dev, d, 2 * port + 1)) { 314 printk(KERN_ERR "%s: I/O baseregs (BIOS) are reported " 315 "as MEM for port %d!\n", d->name, port); 316 return -EINVAL; 317 } 318 319 ctl = pci_resource_start(dev, 2*port+1); 320 base = pci_resource_start(dev, 2*port); 321 } else { 322 /* Use default values */ 323 ctl = port ? 0x374 : 0x3f4; 324 base = port ? 0x170 : 0x1f0; 325 } 326 327 if (!base || !ctl) { 328 printk(KERN_ERR "%s: bad PCI BARs for port %d, skipping\n", 329 d->name, port); 330 return -EINVAL; 331 } 332 333 memset(hw, 0, sizeof(*hw)); 334 hw->irq = irq; 335 hw->dev = &dev->dev; 336 hw->chipset = d->chipset ? d->chipset : ide_pci; 337 ide_std_init_ports(hw, base, ctl | 2); 338 339 return 0; 340} 341 342#ifdef CONFIG_BLK_DEV_IDEDMA_PCI 343/** 344 * ide_hwif_setup_dma - configure DMA interface 345 * @hwif: IDE interface 346 * @d: IDE port info 347 * 348 * Set up the DMA base for the interface. Enable the master bits as 349 * necessary and attempt to bring the device DMA into a ready to use 350 * state 351 */ 352 353int ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d) 354{ 355 struct pci_dev *dev = to_pci_dev(hwif->dev); 356 357 if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 || 358 ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && 359 (dev->class & 0x80))) { 360 unsigned long base = ide_pci_dma_base(hwif, d); 361 362 if (base == 0) 363 return -1; 364 365 hwif->dma_base = base; 366 367 if (ide_pci_check_simplex(hwif, d) < 0) 368 return -1; 369 370 if (ide_pci_set_master(dev, d->name) < 0) 371 return -1; 372 373 if (hwif->host_flags & IDE_HFLAG_MMIO) 374 printk(KERN_INFO " %s: MMIO-DMA\n", hwif->name); 375 else 376 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n", 377 hwif->name, base, base + 7); 378 379 hwif->extra_base = base + (hwif->channel ? 8 : 16); 380 381 if (ide_allocate_dma_engine(hwif)) 382 return -1; 383 384 hwif->dma_ops = &sff_dma_ops; 385 } 386 387 return 0; 388} 389#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */ 390 391/** 392 * ide_setup_pci_controller - set up IDE PCI 393 * @dev: PCI device 394 * @d: IDE port info 395 * @noisy: verbose flag 396 * 397 * Set up the PCI and controller side of the IDE interface. This brings 398 * up the PCI side of the device, checks that the device is enabled 399 * and enables it if need be 400 */ 401 402static int ide_setup_pci_controller(struct pci_dev *dev, 403 const struct ide_port_info *d, int noisy) 404{ 405 int ret; 406 u16 pcicmd; 407 408 if (noisy) 409 ide_setup_pci_noise(dev, d); 410 411 ret = ide_pci_enable(dev, d); 412 if (ret < 0) 413 goto out; 414 415 ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd); 416 if (ret < 0) { 417 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name); 418 goto out; 419 } 420 if (!(pcicmd & PCI_COMMAND_IO)) { /* is device disabled? */ 421 ret = ide_pci_configure(dev, d); 422 if (ret < 0) 423 goto out; 424 printk(KERN_INFO "%s: device enabled (Linux)\n", d->name); 425 } 426 427out: 428 return ret; 429} 430 431/** 432 * ide_pci_setup_ports - configure ports/devices on PCI IDE 433 * @dev: PCI device 434 * @d: IDE port info 435 * @pciirq: IRQ line 436 * @hw: hw_regs_t instances corresponding to this PCI IDE device 437 * @hws: hw_regs_t pointers table to update 438 * 439 * Scan the interfaces attached to this device and do any 440 * necessary per port setup. Attach the devices and ask the 441 * generic DMA layer to do its work for us. 442 * 443 * Normally called automaticall from do_ide_pci_setup_device, 444 * but is also used directly as a helper function by some controllers 445 * where the chipset setup is not the default PCI IDE one. 446 */ 447 448void ide_pci_setup_ports(struct pci_dev *dev, const struct ide_port_info *d, 449 int pciirq, hw_regs_t *hw, hw_regs_t **hws) 450{ 451 int channels = (d->host_flags & IDE_HFLAG_SINGLE) ? 1 : 2, port; 452 u8 tmp; 453 454 /* 455 * Set up the IDE ports 456 */ 457 458 for (port = 0; port < channels; ++port) { 459 const ide_pci_enablebit_t *e = &(d->enablebits[port]); 460 461 if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) || 462 (tmp & e->mask) != e->val)) { 463 printk(KERN_INFO "%s: IDE port disabled\n", d->name); 464 continue; /* port not enabled */ 465 } 466 467 if (ide_hw_configure(dev, d, port, pciirq, hw + port)) 468 continue; 469 470 *(hws + port) = hw + port; 471 } 472} 473EXPORT_SYMBOL_GPL(ide_pci_setup_ports); 474 475/* 476 * ide_setup_pci_device() looks at the primary/secondary interfaces 477 * on a PCI IDE device and, if they are enabled, prepares the IDE driver 478 * for use with them. This generic code works for most PCI chipsets. 479 * 480 * One thing that is not standardized is the location of the 481 * primary/secondary interface "enable/disable" bits. For chipsets that 482 * we "know" about, this information is in the struct ide_port_info; 483 * for all other chipsets, we just assume both interfaces are enabled. 484 */ 485static int do_ide_setup_pci_device(struct pci_dev *dev, 486 const struct ide_port_info *d, 487 u8 noisy) 488{ 489 int pciirq, ret; 490 491 /* 492 * Can we trust the reported IRQ? 493 */ 494 pciirq = dev->irq; 495 496 /* 497 * This allows offboard ide-pci cards the enable a BIOS, 498 * verify interrupt settings of split-mirror pci-config 499 * space, place chipset into init-mode, and/or preserve 500 * an interrupt if the card is not native ide support. 501 */ 502 ret = d->init_chipset ? d->init_chipset(dev, d->name) : 0; 503 if (ret < 0) 504 goto out; 505 506 /* Is it an "IDE storage" device in non-PCI mode? */ 507 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) { 508 if (noisy) 509 printk(KERN_INFO "%s: not 100%% native mode: " 510 "will probe irqs later\n", d->name); 511 pciirq = ret; 512 } else if (!pciirq) { 513 if (noisy) 514 printk(KERN_WARNING "%s: bad irq (%d): will probe later\n", 515 d->name, pciirq); 516 pciirq = 0; 517 } else { 518 if (noisy) 519 printk(KERN_INFO "%s: 100%% native mode on irq %d\n", 520 d->name, pciirq); 521 } 522 523 ret = pciirq; 524out: 525 return ret; 526} 527 528int ide_setup_pci_device(struct pci_dev *dev, const struct ide_port_info *d) 529{ 530 hw_regs_t hw[4], *hws[] = { NULL, NULL, NULL, NULL }; 531 int ret; 532 533 ret = ide_setup_pci_controller(dev, d, 1); 534 if (ret < 0) 535 goto out; 536 537 ide_pci_setup_ports(dev, d, 0, &hw[0], &hws[0]); 538 539 ret = do_ide_setup_pci_device(dev, d, 1); 540 if (ret < 0) 541 goto out; 542 543 /* fixup IRQ */ 544 hw[1].irq = hw[0].irq = ret; 545 546 ret = ide_host_add(d, hws, NULL); 547out: 548 return ret; 549} 550EXPORT_SYMBOL_GPL(ide_setup_pci_device); 551 552int ide_setup_pci_devices(struct pci_dev *dev1, struct pci_dev *dev2, 553 const struct ide_port_info *d) 554{ 555 struct pci_dev *pdev[] = { dev1, dev2 }; 556 int ret, i; 557 hw_regs_t hw[4], *hws[] = { NULL, NULL, NULL, NULL }; 558 559 for (i = 0; i < 2; i++) { 560 ret = ide_setup_pci_controller(pdev[i], d, !i); 561 if (ret < 0) 562 goto out; 563 564 ide_pci_setup_ports(pdev[i], d, 0, &hw[i*2], &hws[i*2]); 565 566 ret = do_ide_setup_pci_device(pdev[i], d, !i); 567 568 /* 569 * FIXME: Mom, mom, they stole me the helper function to undo 570 * do_ide_setup_pci_device() on the first device! 571 */ 572 if (ret < 0) 573 goto out; 574 575 /* fixup IRQ */ 576 hw[i*2 + 1].irq = hw[i*2].irq = ret; 577 } 578 579 ret = ide_host_add(d, hws, NULL); 580out: 581 return ret; 582} 583EXPORT_SYMBOL_GPL(ide_setup_pci_devices); 584