1/* 2 * drivers.c 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Copyright (c) 1999 The Puffin Group 10 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard 11 * Copyright (c) 2001 Helge Deller <deller@gmx.de> 12 * Copyright (c) 2001,2002 Ryan Bradetich 13 * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org> 14 * 15 * The file handles registering devices and drivers, then matching them. 16 * It's the closest we get to a dating agency. 17 * 18 * If you're thinking about modifying this file, here are some gotchas to 19 * bear in mind: 20 * - 715/Mirage device paths have a dummy device between Lasi and its children 21 * - The EISA adapter may show up as a sibling or child of Wax 22 * - Dino has an optionally functional serial port. If firmware enables it, 23 * it shows up as a child of Dino. If firmware disables it, the buswalk 24 * finds it and it shows up as a child of Cujo 25 * - Dino has both parisc and pci devices as children 26 * - parisc devices are discovered in a random order, including children 27 * before parents in some cases. 28 */ 29 30#include <linux/slab.h> 31#include <linux/types.h> 32#include <linux/kernel.h> 33#include <linux/pci.h> 34#include <linux/spinlock.h> 35#include <linux/string.h> 36#include <asm/hardware.h> 37#include <asm/io.h> 38#include <asm/pdc.h> 39#include <asm/parisc-device.h> 40 41/* See comments in include/asm-parisc/pci.h */ 42struct hppa_dma_ops *hppa_dma_ops __read_mostly; 43EXPORT_SYMBOL(hppa_dma_ops); 44 45static struct device root = { 46 .init_name = "parisc", 47}; 48 49static inline int check_dev(struct device *dev) 50{ 51 if (dev->bus == &parisc_bus_type) { 52 struct parisc_device *pdev; 53 pdev = to_parisc_device(dev); 54 return pdev->id.hw_type != HPHW_FAULTY; 55 } 56 return 1; 57} 58 59static struct device * 60parse_tree_node(struct device *parent, int index, struct hardware_path *modpath); 61 62struct recurse_struct { 63 void * obj; 64 int (*fn)(struct device *, void *); 65}; 66 67static int descend_children(struct device * dev, void * data) 68{ 69 struct recurse_struct * recurse_data = (struct recurse_struct *)data; 70 71 if (recurse_data->fn(dev, recurse_data->obj)) 72 return 1; 73 else 74 return device_for_each_child(dev, recurse_data, descend_children); 75} 76 77/** 78 * for_each_padev - Iterate over all devices in the tree 79 * @fn: Function to call for each device. 80 * @data: Data to pass to the called function. 81 * 82 * This performs a depth-first traversal of the tree, calling the 83 * function passed for each node. It calls the function for parents 84 * before children. 85 */ 86 87static int for_each_padev(int (*fn)(struct device *, void *), void * data) 88{ 89 struct recurse_struct recurse_data = { 90 .obj = data, 91 .fn = fn, 92 }; 93 return device_for_each_child(&root, &recurse_data, descend_children); 94} 95 96/** 97 * match_device - Report whether this driver can handle this device 98 * @driver: the PA-RISC driver to try 99 * @dev: the PA-RISC device to try 100 */ 101static int match_device(struct parisc_driver *driver, struct parisc_device *dev) 102{ 103 const struct parisc_device_id *ids; 104 105 for (ids = driver->id_table; ids->sversion; ids++) { 106 if ((ids->sversion != SVERSION_ANY_ID) && 107 (ids->sversion != dev->id.sversion)) 108 continue; 109 110 if ((ids->hw_type != HWTYPE_ANY_ID) && 111 (ids->hw_type != dev->id.hw_type)) 112 continue; 113 114 if ((ids->hversion != HVERSION_ANY_ID) && 115 (ids->hversion != dev->id.hversion)) 116 continue; 117 118 return 1; 119 } 120 return 0; 121} 122 123static int parisc_driver_probe(struct device *dev) 124{ 125 int rc; 126 struct parisc_device *pa_dev = to_parisc_device(dev); 127 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver); 128 129 rc = pa_drv->probe(pa_dev); 130 131 if (!rc) 132 pa_dev->driver = pa_drv; 133 134 return rc; 135} 136 137static int parisc_driver_remove(struct device *dev) 138{ 139 struct parisc_device *pa_dev = to_parisc_device(dev); 140 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver); 141 if (pa_drv->remove) 142 pa_drv->remove(pa_dev); 143 144 return 0; 145} 146 147 148/** 149 * register_parisc_driver - Register this driver if it can handle a device 150 * @driver: the PA-RISC driver to try 151 */ 152int register_parisc_driver(struct parisc_driver *driver) 153{ 154 if(driver->drv.name) { 155 printk(KERN_WARNING 156 "BUG: skipping previously registered driver %s\n", 157 driver->name); 158 return 1; 159 } 160 161 if (!driver->probe) { 162 printk(KERN_WARNING 163 "BUG: driver %s has no probe routine\n", 164 driver->name); 165 return 1; 166 } 167 168 driver->drv.bus = &parisc_bus_type; 169 170 /* We install our own probe and remove routines */ 171 WARN_ON(driver->drv.probe != NULL); 172 WARN_ON(driver->drv.remove != NULL); 173 174 driver->drv.name = driver->name; 175 176 return driver_register(&driver->drv); 177} 178EXPORT_SYMBOL(register_parisc_driver); 179 180 181struct match_count { 182 struct parisc_driver * driver; 183 int count; 184}; 185 186static int match_and_count(struct device * dev, void * data) 187{ 188 struct match_count * m = data; 189 struct parisc_device * pdev = to_parisc_device(dev); 190 191 if (check_dev(dev)) { 192 if (match_device(m->driver, pdev)) 193 m->count++; 194 } 195 return 0; 196} 197 198/** 199 * count_parisc_driver - count # of devices this driver would match 200 * @driver: the PA-RISC driver to try 201 * 202 * Use by IOMMU support to "guess" the right size IOPdir. 203 * Formula is something like memsize/(num_iommu * entry_size). 204 */ 205int count_parisc_driver(struct parisc_driver *driver) 206{ 207 struct match_count m = { 208 .driver = driver, 209 .count = 0, 210 }; 211 212 for_each_padev(match_and_count, &m); 213 214 return m.count; 215} 216 217 218 219/** 220 * unregister_parisc_driver - Unregister this driver from the list of drivers 221 * @driver: the PA-RISC driver to unregister 222 */ 223int unregister_parisc_driver(struct parisc_driver *driver) 224{ 225 driver_unregister(&driver->drv); 226 return 0; 227} 228EXPORT_SYMBOL(unregister_parisc_driver); 229 230struct find_data { 231 unsigned long hpa; 232 struct parisc_device * dev; 233}; 234 235static int find_device(struct device * dev, void * data) 236{ 237 struct parisc_device * pdev = to_parisc_device(dev); 238 struct find_data * d = (struct find_data*)data; 239 240 if (check_dev(dev)) { 241 if (pdev->hpa.start == d->hpa) { 242 d->dev = pdev; 243 return 1; 244 } 245 } 246 return 0; 247} 248 249static struct parisc_device *find_device_by_addr(unsigned long hpa) 250{ 251 struct find_data d = { 252 .hpa = hpa, 253 }; 254 int ret; 255 256 ret = for_each_padev(find_device, &d); 257 return ret ? d.dev : NULL; 258} 259 260/** 261 * find_pa_parent_type - Find a parent of a specific type 262 * @dev: The device to start searching from 263 * @type: The device type to search for. 264 * 265 * Walks up the device tree looking for a device of the specified type. 266 * If it finds it, it returns it. If not, it returns NULL. 267 */ 268const struct parisc_device * 269find_pa_parent_type(const struct parisc_device *padev, int type) 270{ 271 const struct device *dev = &padev->dev; 272 while (dev != &root) { 273 struct parisc_device *candidate = to_parisc_device(dev); 274 if (candidate->id.hw_type == type) 275 return candidate; 276 dev = dev->parent; 277 } 278 279 return NULL; 280} 281 282#ifdef CONFIG_PCI 283static inline int is_pci_dev(struct device *dev) 284{ 285 return dev->bus == &pci_bus_type; 286} 287#else 288static inline int is_pci_dev(struct device *dev) 289{ 290 return 0; 291} 292#endif 293 294/* 295 * get_node_path fills in @path with the firmware path to the device. 296 * Note that if @node is a parisc device, we don't fill in the 'mod' field. 297 * This is because both callers pass the parent and fill in the mod 298 * themselves. If @node is a PCI device, we do fill it in, even though this 299 * is inconsistent. 300 */ 301static void get_node_path(struct device *dev, struct hardware_path *path) 302{ 303 int i = 5; 304 memset(&path->bc, -1, 6); 305 306 if (is_pci_dev(dev)) { 307 unsigned int devfn = to_pci_dev(dev)->devfn; 308 path->mod = PCI_FUNC(devfn); 309 path->bc[i--] = PCI_SLOT(devfn); 310 dev = dev->parent; 311 } 312 313 while (dev != &root) { 314 if (is_pci_dev(dev)) { 315 unsigned int devfn = to_pci_dev(dev)->devfn; 316 path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5); 317 } else if (dev->bus == &parisc_bus_type) { 318 path->bc[i--] = to_parisc_device(dev)->hw_path; 319 } 320 dev = dev->parent; 321 } 322} 323 324static char *print_hwpath(struct hardware_path *path, char *output) 325{ 326 int i; 327 for (i = 0; i < 6; i++) { 328 if (path->bc[i] == -1) 329 continue; 330 output += sprintf(output, "%u/", (unsigned char) path->bc[i]); 331 } 332 output += sprintf(output, "%u", (unsigned char) path->mod); 333 return output; 334} 335 336/** 337 * print_pa_hwpath - Returns hardware path for PA devices 338 * dev: The device to return the path for 339 * output: Pointer to a previously-allocated array to place the path in. 340 * 341 * This function fills in the output array with a human-readable path 342 * to a PA device. This string is compatible with that used by PDC, and 343 * may be printed on the outside of the box. 344 */ 345char *print_pa_hwpath(struct parisc_device *dev, char *output) 346{ 347 struct hardware_path path; 348 349 get_node_path(dev->dev.parent, &path); 350 path.mod = dev->hw_path; 351 return print_hwpath(&path, output); 352} 353EXPORT_SYMBOL(print_pa_hwpath); 354 355#if defined(CONFIG_PCI) || defined(CONFIG_ISA) 356/** 357 * get_pci_node_path - Determines the hardware path for a PCI device 358 * @pdev: The device to return the path for 359 * @path: Pointer to a previously-allocated array to place the path in. 360 * 361 * This function fills in the hardware_path structure with the route to 362 * the specified PCI device. This structure is suitable for passing to 363 * PDC calls. 364 */ 365void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path) 366{ 367 get_node_path(&pdev->dev, path); 368} 369EXPORT_SYMBOL(get_pci_node_path); 370 371/** 372 * print_pci_hwpath - Returns hardware path for PCI devices 373 * dev: The device to return the path for 374 * output: Pointer to a previously-allocated array to place the path in. 375 * 376 * This function fills in the output array with a human-readable path 377 * to a PCI device. This string is compatible with that used by PDC, and 378 * may be printed on the outside of the box. 379 */ 380char *print_pci_hwpath(struct pci_dev *dev, char *output) 381{ 382 struct hardware_path path; 383 384 get_pci_node_path(dev, &path); 385 return print_hwpath(&path, output); 386} 387EXPORT_SYMBOL(print_pci_hwpath); 388 389#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */ 390 391static void setup_bus_id(struct parisc_device *padev) 392{ 393 struct hardware_path path; 394 char name[20]; 395 char *output = name; 396 int i; 397 398 get_node_path(padev->dev.parent, &path); 399 400 for (i = 0; i < 6; i++) { 401 if (path.bc[i] == -1) 402 continue; 403 output += sprintf(output, "%u:", (unsigned char) path.bc[i]); 404 } 405 sprintf(output, "%u", (unsigned char) padev->hw_path); 406 dev_set_name(&padev->dev, name); 407} 408 409struct parisc_device * create_tree_node(char id, struct device *parent) 410{ 411 struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL); 412 if (!dev) 413 return NULL; 414 415 dev->hw_path = id; 416 dev->id.hw_type = HPHW_FAULTY; 417 418 dev->dev.parent = parent; 419 setup_bus_id(dev); 420 421 dev->dev.bus = &parisc_bus_type; 422 dev->dma_mask = 0xffffffffUL; /* PARISC devices are 32-bit */ 423 424 /* make the generic dma mask a pointer to the parisc one */ 425 dev->dev.dma_mask = &dev->dma_mask; 426 dev->dev.coherent_dma_mask = dev->dma_mask; 427 if (device_register(&dev->dev)) { 428 kfree(dev); 429 return NULL; 430 } 431 432 return dev; 433} 434 435struct match_id_data { 436 char id; 437 struct parisc_device * dev; 438}; 439 440static int match_by_id(struct device * dev, void * data) 441{ 442 struct parisc_device * pdev = to_parisc_device(dev); 443 struct match_id_data * d = data; 444 445 if (pdev->hw_path == d->id) { 446 d->dev = pdev; 447 return 1; 448 } 449 return 0; 450} 451 452/** 453 * alloc_tree_node - returns a device entry in the iotree 454 * @parent: the parent node in the tree 455 * @id: the element of the module path for this entry 456 * 457 * Checks all the children of @parent for a matching @id. If none 458 * found, it allocates a new device and returns it. 459 */ 460static struct parisc_device * alloc_tree_node(struct device *parent, char id) 461{ 462 struct match_id_data d = { 463 .id = id, 464 }; 465 if (device_for_each_child(parent, &d, match_by_id)) 466 return d.dev; 467 else 468 return create_tree_node(id, parent); 469} 470 471static struct parisc_device *create_parisc_device(struct hardware_path *modpath) 472{ 473 int i; 474 struct device *parent = &root; 475 for (i = 0; i < 6; i++) { 476 if (modpath->bc[i] == -1) 477 continue; 478 parent = &alloc_tree_node(parent, modpath->bc[i])->dev; 479 } 480 return alloc_tree_node(parent, modpath->mod); 481} 482 483struct parisc_device * 484alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path) 485{ 486 int status; 487 unsigned long bytecnt; 488 u8 iodc_data[32]; 489 struct parisc_device *dev; 490 const char *name; 491 492 /* Check to make sure this device has not already been added - Ryan */ 493 if (find_device_by_addr(hpa) != NULL) 494 return NULL; 495 496 status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32); 497 if (status != PDC_OK) 498 return NULL; 499 500 dev = create_parisc_device(mod_path); 501 if (dev->id.hw_type != HPHW_FAULTY) { 502 printk(KERN_ERR "Two devices have hardware path [%s]. " 503 "IODC data for second device: " 504 "%02x%02x%02x%02x%02x%02x\n" 505 "Rearranging GSC cards sometimes helps\n", 506 parisc_pathname(dev), iodc_data[0], iodc_data[1], 507 iodc_data[3], iodc_data[4], iodc_data[5], iodc_data[6]); 508 return NULL; 509 } 510 511 dev->id.hw_type = iodc_data[3] & 0x1f; 512 dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4); 513 dev->id.hversion_rev = iodc_data[1] & 0x0f; 514 dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) | 515 (iodc_data[5] << 8) | iodc_data[6]; 516 dev->hpa.name = parisc_pathname(dev); 517 dev->hpa.start = hpa; 518 /* This is awkward. The STI spec says that gfx devices may occupy 519 * 32MB or 64MB. Unfortunately, we don't know how to tell whether 520 * it's the former or the latter. Assumptions either way can hurt us. 521 */ 522 if (hpa == 0xf4000000 || hpa == 0xf8000000) { 523 dev->hpa.end = hpa + 0x03ffffff; 524 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) { 525 dev->hpa.end = hpa + 0x01ffffff; 526 } else { 527 dev->hpa.end = hpa + 0xfff; 528 } 529 dev->hpa.flags = IORESOURCE_MEM; 530 name = parisc_hardware_description(&dev->id); 531 if (name) { 532 strlcpy(dev->name, name, sizeof(dev->name)); 533 } 534 535 /* Silently fail things like mouse ports which are subsumed within 536 * the keyboard controller 537 */ 538 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa)) 539 printk("Unable to claim HPA %lx for device %s\n", 540 hpa, name); 541 542 return dev; 543} 544 545static int parisc_generic_match(struct device *dev, struct device_driver *drv) 546{ 547 return match_device(to_parisc_driver(drv), to_parisc_device(dev)); 548} 549 550static ssize_t make_modalias(struct device *dev, char *buf) 551{ 552 const struct parisc_device *padev = to_parisc_device(dev); 553 const struct parisc_device_id *id = &padev->id; 554 555 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n", 556 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev, 557 (u32)id->sversion); 558} 559 560static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env) 561{ 562 const struct parisc_device *padev; 563 char modalias[40]; 564 565 if (!dev) 566 return -ENODEV; 567 568 padev = to_parisc_device(dev); 569 if (!padev) 570 return -ENODEV; 571 572 if (add_uevent_var(env, "PARISC_NAME=%s", padev->name)) 573 return -ENOMEM; 574 575 make_modalias(dev, modalias); 576 if (add_uevent_var(env, "MODALIAS=%s", modalias)) 577 return -ENOMEM; 578 579 return 0; 580} 581 582#define pa_dev_attr(name, field, format_string) \ 583static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 584{ \ 585 struct parisc_device *padev = to_parisc_device(dev); \ 586 return sprintf(buf, format_string, padev->field); \ 587} 588 589#define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format) 590 591pa_dev_attr(irq, irq, "%u\n"); 592pa_dev_attr_id(hw_type, "0x%02x\n"); 593pa_dev_attr(rev, id.hversion_rev, "0x%x\n"); 594pa_dev_attr_id(hversion, "0x%03x\n"); 595pa_dev_attr_id(sversion, "0x%05x\n"); 596 597static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 598{ 599 return make_modalias(dev, buf); 600} 601 602static struct device_attribute parisc_device_attrs[] = { 603 __ATTR_RO(irq), 604 __ATTR_RO(hw_type), 605 __ATTR_RO(rev), 606 __ATTR_RO(hversion), 607 __ATTR_RO(sversion), 608 __ATTR_RO(modalias), 609 __ATTR_NULL, 610}; 611 612struct bus_type parisc_bus_type = { 613 .name = "parisc", 614 .match = parisc_generic_match, 615 .uevent = parisc_uevent, 616 .dev_attrs = parisc_device_attrs, 617 .probe = parisc_driver_probe, 618 .remove = parisc_driver_remove, 619}; 620 621/** 622 * register_parisc_device - Locate a driver to manage this device. 623 * @dev: The parisc device. 624 * 625 * Search the driver list for a driver that is willing to manage 626 * this device. 627 */ 628int register_parisc_device(struct parisc_device *dev) 629{ 630 if (!dev) 631 return 0; 632 633 if (dev->driver) 634 return 1; 635 636 return 0; 637} 638 639/** 640 * match_pci_device - Matches a pci device against a given hardware path 641 * entry. 642 * @dev: the generic device (known to be contained by a pci_dev). 643 * @index: the current BC index 644 * @modpath: the hardware path. 645 * @return: true if the device matches the hardware path. 646 */ 647static int match_pci_device(struct device *dev, int index, 648 struct hardware_path *modpath) 649{ 650 struct pci_dev *pdev = to_pci_dev(dev); 651 int id; 652 653 if (index == 5) { 654 /* we are at the end of the path, and on the actual device */ 655 unsigned int devfn = pdev->devfn; 656 return ((modpath->bc[5] == PCI_SLOT(devfn)) && 657 (modpath->mod == PCI_FUNC(devfn))); 658 } 659 660 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5); 661 return (modpath->bc[index] == id); 662} 663 664/** 665 * match_parisc_device - Matches a parisc device against a given hardware 666 * path entry. 667 * @dev: the generic device (known to be contained by a parisc_device). 668 * @index: the current BC index 669 * @modpath: the hardware path. 670 * @return: true if the device matches the hardware path. 671 */ 672static int match_parisc_device(struct device *dev, int index, 673 struct hardware_path *modpath) 674{ 675 struct parisc_device *curr = to_parisc_device(dev); 676 char id = (index == 6) ? modpath->mod : modpath->bc[index]; 677 678 return (curr->hw_path == id); 679} 680 681struct parse_tree_data { 682 int index; 683 struct hardware_path * modpath; 684 struct device * dev; 685}; 686 687static int check_parent(struct device * dev, void * data) 688{ 689 struct parse_tree_data * d = data; 690 691 if (check_dev(dev)) { 692 if (dev->bus == &parisc_bus_type) { 693 if (match_parisc_device(dev, d->index, d->modpath)) 694 d->dev = dev; 695 } else if (is_pci_dev(dev)) { 696 if (match_pci_device(dev, d->index, d->modpath)) 697 d->dev = dev; 698 } else if (dev->bus == NULL) { 699 /* we are on a bus bridge */ 700 struct device *new = parse_tree_node(dev, d->index, d->modpath); 701 if (new) 702 d->dev = new; 703 } 704 } 705 return d->dev != NULL; 706} 707 708/** 709 * parse_tree_node - returns a device entry in the iotree 710 * @parent: the parent node in the tree 711 * @index: the current BC index 712 * @modpath: the hardware_path struct to match a device against 713 * @return: The corresponding device if found, NULL otherwise. 714 * 715 * Checks all the children of @parent for a matching @id. If none 716 * found, it returns NULL. 717 */ 718static struct device * 719parse_tree_node(struct device *parent, int index, struct hardware_path *modpath) 720{ 721 struct parse_tree_data d = { 722 .index = index, 723 .modpath = modpath, 724 }; 725 726 struct recurse_struct recurse_data = { 727 .obj = &d, 728 .fn = check_parent, 729 }; 730 731 if (device_for_each_child(parent, &recurse_data, descend_children)) 732 /* nothing */; 733 734 return d.dev; 735} 736 737/** 738 * hwpath_to_device - Finds the generic device corresponding to a given hardware path. 739 * @modpath: the hardware path. 740 * @return: The target device, NULL if not found. 741 */ 742struct device *hwpath_to_device(struct hardware_path *modpath) 743{ 744 int i; 745 struct device *parent = &root; 746 for (i = 0; i < 6; i++) { 747 if (modpath->bc[i] == -1) 748 continue; 749 parent = parse_tree_node(parent, i, modpath); 750 if (!parent) 751 return NULL; 752 } 753 if (is_pci_dev(parent)) /* pci devices already parse MOD */ 754 return parent; 755 else 756 return parse_tree_node(parent, 6, modpath); 757} 758EXPORT_SYMBOL(hwpath_to_device); 759 760/** 761 * device_to_hwpath - Populates the hwpath corresponding to the given device. 762 * @param dev the target device 763 * @param path pointer to a previously allocated hwpath struct to be filled in 764 */ 765void device_to_hwpath(struct device *dev, struct hardware_path *path) 766{ 767 struct parisc_device *padev; 768 if (dev->bus == &parisc_bus_type) { 769 padev = to_parisc_device(dev); 770 get_node_path(dev->parent, path); 771 path->mod = padev->hw_path; 772 } else if (is_pci_dev(dev)) { 773 get_node_path(dev, path); 774 } 775} 776EXPORT_SYMBOL(device_to_hwpath); 777 778#define BC_PORT_MASK 0x8 779#define BC_LOWER_PORT 0x8 780 781#define BUS_CONVERTER(dev) \ 782 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT)) 783 784#define IS_LOWER_PORT(dev) \ 785 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \ 786 & BC_PORT_MASK) == BC_LOWER_PORT) 787 788#define MAX_NATIVE_DEVICES 64 789#define NATIVE_DEVICE_OFFSET 0x1000 790 791#define FLEX_MASK F_EXTEND(0xfffc0000) 792#define IO_IO_LOW offsetof(struct bc_module, io_io_low) 793#define IO_IO_HIGH offsetof(struct bc_module, io_io_high) 794#define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW) 795#define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH) 796 797static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high, 798 struct device *parent); 799 800void walk_lower_bus(struct parisc_device *dev) 801{ 802 unsigned long io_io_low, io_io_high; 803 804 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev)) 805 return; 806 807 if (dev->id.hw_type == HPHW_IOA) { 808 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16); 809 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET; 810 } else { 811 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK; 812 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK; 813 } 814 815 walk_native_bus(io_io_low, io_io_high, &dev->dev); 816} 817 818/** 819 * walk_native_bus -- Probe a bus for devices 820 * @io_io_low: Base address of this bus. 821 * @io_io_high: Last address of this bus. 822 * @parent: The parent bus device. 823 * 824 * A native bus (eg Runway or GSC) may have up to 64 devices on it, 825 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these 826 * devices, so we have to probe for them. Unfortunately, we may find 827 * devices which are not physically connected (such as extra serial & 828 * keyboard ports). This problem is not yet solved. 829 */ 830static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high, 831 struct device *parent) 832{ 833 int i, devices_found = 0; 834 unsigned long hpa = io_io_low; 835 struct hardware_path path; 836 837 get_node_path(parent, &path); 838 do { 839 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) { 840 struct parisc_device *dev; 841 842 /* Was the device already added by Firmware? */ 843 dev = find_device_by_addr(hpa); 844 if (!dev) { 845 path.mod = i; 846 dev = alloc_pa_dev(hpa, &path); 847 if (!dev) 848 continue; 849 850 register_parisc_device(dev); 851 devices_found++; 852 } 853 walk_lower_bus(dev); 854 } 855 } while(!devices_found && hpa < io_io_high); 856} 857 858#define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000) 859 860/** 861 * walk_central_bus - Find devices attached to the central bus 862 * 863 * PDC doesn't tell us about all devices in the system. This routine 864 * finds devices connected to the central bus. 865 */ 866void walk_central_bus(void) 867{ 868 walk_native_bus(CENTRAL_BUS_ADDR, 869 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET), 870 &root); 871} 872 873static void print_parisc_device(struct parisc_device *dev) 874{ 875 char hw_path[64]; 876 static int count; 877 878 print_pa_hwpath(dev, hw_path); 879 printk(KERN_INFO "%d. %s at 0x%p [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }", 880 ++count, dev->name, (void*) dev->hpa.start, hw_path, dev->id.hw_type, 881 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion); 882 883 if (dev->num_addrs) { 884 int k; 885 printk(", additional addresses: "); 886 for (k = 0; k < dev->num_addrs; k++) 887 printk("0x%lx ", dev->addr[k]); 888 } 889 printk("\n"); 890} 891 892/** 893 * init_parisc_bus - Some preparation to be done before inventory 894 */ 895void init_parisc_bus(void) 896{ 897 if (bus_register(&parisc_bus_type)) 898 panic("Could not register PA-RISC bus type\n"); 899 if (device_register(&root)) 900 panic("Could not register PA-RISC root device\n"); 901 get_device(&root); 902} 903 904 905static int print_one_device(struct device * dev, void * data) 906{ 907 struct parisc_device * pdev = to_parisc_device(dev); 908 909 if (check_dev(dev)) 910 print_parisc_device(pdev); 911 return 0; 912} 913 914/** 915 * print_parisc_devices - Print out a list of devices found in this system 916 */ 917void print_parisc_devices(void) 918{ 919 for_each_padev(print_one_device, NULL); 920} 921