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 .bus_id = "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 *output = padev->dev.bus_id; 395 int i; 396 397 get_node_path(padev->dev.parent, &path); 398 399 for (i = 0; i < 6; i++) { 400 if (path.bc[i] == -1) 401 continue; 402 output += sprintf(output, "%u:", (unsigned char) path.bc[i]); 403 } 404 sprintf(output, "%u", (unsigned char) padev->hw_path); 405} 406 407struct parisc_device * create_tree_node(char id, struct device *parent) 408{ 409 struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL); 410 if (!dev) 411 return NULL; 412 413 dev->hw_path = id; 414 dev->id.hw_type = HPHW_FAULTY; 415 416 dev->dev.parent = parent; 417 setup_bus_id(dev); 418 419 dev->dev.bus = &parisc_bus_type; 420 dev->dma_mask = 0xffffffffUL; /* PARISC devices are 32-bit */ 421 422 /* make the generic dma mask a pointer to the parisc one */ 423 dev->dev.dma_mask = &dev->dma_mask; 424 dev->dev.coherent_dma_mask = dev->dma_mask; 425 if (device_register(&dev->dev)) { 426 kfree(dev); 427 return NULL; 428 } 429 430 return dev; 431} 432 433struct match_id_data { 434 char id; 435 struct parisc_device * dev; 436}; 437 438static int match_by_id(struct device * dev, void * data) 439{ 440 struct parisc_device * pdev = to_parisc_device(dev); 441 struct match_id_data * d = data; 442 443 if (pdev->hw_path == d->id) { 444 d->dev = pdev; 445 return 1; 446 } 447 return 0; 448} 449 450/** 451 * alloc_tree_node - returns a device entry in the iotree 452 * @parent: the parent node in the tree 453 * @id: the element of the module path for this entry 454 * 455 * Checks all the children of @parent for a matching @id. If none 456 * found, it allocates a new device and returns it. 457 */ 458static struct parisc_device * alloc_tree_node(struct device *parent, char id) 459{ 460 struct match_id_data d = { 461 .id = id, 462 }; 463 if (device_for_each_child(parent, &d, match_by_id)) 464 return d.dev; 465 else 466 return create_tree_node(id, parent); 467} 468 469static struct parisc_device *create_parisc_device(struct hardware_path *modpath) 470{ 471 int i; 472 struct device *parent = &root; 473 for (i = 0; i < 6; i++) { 474 if (modpath->bc[i] == -1) 475 continue; 476 parent = &alloc_tree_node(parent, modpath->bc[i])->dev; 477 } 478 return alloc_tree_node(parent, modpath->mod); 479} 480 481struct parisc_device * 482alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path) 483{ 484 int status; 485 unsigned long bytecnt; 486 u8 iodc_data[32]; 487 struct parisc_device *dev; 488 const char *name; 489 490 /* Check to make sure this device has not already been added - Ryan */ 491 if (find_device_by_addr(hpa) != NULL) 492 return NULL; 493 494 status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32); 495 if (status != PDC_OK) 496 return NULL; 497 498 dev = create_parisc_device(mod_path); 499 if (dev->id.hw_type != HPHW_FAULTY) { 500 printk(KERN_ERR "Two devices have hardware path [%s]. " 501 "IODC data for second device: " 502 "%02x%02x%02x%02x%02x%02x\n" 503 "Rearranging GSC cards sometimes helps\n", 504 parisc_pathname(dev), iodc_data[0], iodc_data[1], 505 iodc_data[3], iodc_data[4], iodc_data[5], iodc_data[6]); 506 return NULL; 507 } 508 509 dev->id.hw_type = iodc_data[3] & 0x1f; 510 dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4); 511 dev->id.hversion_rev = iodc_data[1] & 0x0f; 512 dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) | 513 (iodc_data[5] << 8) | iodc_data[6]; 514 dev->hpa.name = parisc_pathname(dev); 515 dev->hpa.start = hpa; 516 /* This is awkward. The STI spec says that gfx devices may occupy 517 * 32MB or 64MB. Unfortunately, we don't know how to tell whether 518 * it's the former or the latter. Assumptions either way can hurt us. 519 */ 520 if (hpa == 0xf4000000 || hpa == 0xf8000000) { 521 dev->hpa.end = hpa + 0x03ffffff; 522 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) { 523 dev->hpa.end = hpa + 0x01ffffff; 524 } else { 525 dev->hpa.end = hpa + 0xfff; 526 } 527 dev->hpa.flags = IORESOURCE_MEM; 528 name = parisc_hardware_description(&dev->id); 529 if (name) { 530 strlcpy(dev->name, name, sizeof(dev->name)); 531 } 532 533 /* Silently fail things like mouse ports which are subsumed within 534 * the keyboard controller 535 */ 536 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa)) 537 printk("Unable to claim HPA %lx for device %s\n", 538 hpa, name); 539 540 return dev; 541} 542 543static int parisc_generic_match(struct device *dev, struct device_driver *drv) 544{ 545 return match_device(to_parisc_driver(drv), to_parisc_device(dev)); 546} 547 548#define pa_dev_attr(name, field, format_string) \ 549static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 550{ \ 551 struct parisc_device *padev = to_parisc_device(dev); \ 552 return sprintf(buf, format_string, padev->field); \ 553} 554 555#define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format) 556 557pa_dev_attr(irq, irq, "%u\n"); 558pa_dev_attr_id(hw_type, "0x%02x\n"); 559pa_dev_attr(rev, id.hversion_rev, "0x%x\n"); 560pa_dev_attr_id(hversion, "0x%03x\n"); 561pa_dev_attr_id(sversion, "0x%05x\n"); 562 563static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 564{ 565 struct parisc_device *padev = to_parisc_device(dev); 566 struct parisc_device_id *id = &padev->id; 567 568 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n", 569 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev, 570 (u32)id->sversion); 571} 572 573static struct device_attribute parisc_device_attrs[] = { 574 __ATTR_RO(irq), 575 __ATTR_RO(hw_type), 576 __ATTR_RO(rev), 577 __ATTR_RO(hversion), 578 __ATTR_RO(sversion), 579 __ATTR_RO(modalias), 580 __ATTR_NULL, 581}; 582 583struct bus_type parisc_bus_type = { 584 .name = "parisc", 585 .match = parisc_generic_match, 586 .dev_attrs = parisc_device_attrs, 587 .probe = parisc_driver_probe, 588 .remove = parisc_driver_remove, 589}; 590 591/** 592 * register_parisc_device - Locate a driver to manage this device. 593 * @dev: The parisc device. 594 * 595 * Search the driver list for a driver that is willing to manage 596 * this device. 597 */ 598int register_parisc_device(struct parisc_device *dev) 599{ 600 if (!dev) 601 return 0; 602 603 if (dev->driver) 604 return 1; 605 606 return 0; 607} 608 609/** 610 * match_pci_device - Matches a pci device against a given hardware path 611 * entry. 612 * @dev: the generic device (known to be contained by a pci_dev). 613 * @index: the current BC index 614 * @modpath: the hardware path. 615 * @return: true if the device matches the hardware path. 616 */ 617static int match_pci_device(struct device *dev, int index, 618 struct hardware_path *modpath) 619{ 620 struct pci_dev *pdev = to_pci_dev(dev); 621 int id; 622 623 if (index == 5) { 624 /* we are at the end of the path, and on the actual device */ 625 unsigned int devfn = pdev->devfn; 626 return ((modpath->bc[5] == PCI_SLOT(devfn)) && 627 (modpath->mod == PCI_FUNC(devfn))); 628 } 629 630 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5); 631 return (modpath->bc[index] == id); 632} 633 634/** 635 * match_parisc_device - Matches a parisc device against a given hardware 636 * path entry. 637 * @dev: the generic device (known to be contained by a parisc_device). 638 * @index: the current BC index 639 * @modpath: the hardware path. 640 * @return: true if the device matches the hardware path. 641 */ 642static int match_parisc_device(struct device *dev, int index, 643 struct hardware_path *modpath) 644{ 645 struct parisc_device *curr = to_parisc_device(dev); 646 char id = (index == 6) ? modpath->mod : modpath->bc[index]; 647 648 return (curr->hw_path == id); 649} 650 651struct parse_tree_data { 652 int index; 653 struct hardware_path * modpath; 654 struct device * dev; 655}; 656 657static int check_parent(struct device * dev, void * data) 658{ 659 struct parse_tree_data * d = data; 660 661 if (check_dev(dev)) { 662 if (dev->bus == &parisc_bus_type) { 663 if (match_parisc_device(dev, d->index, d->modpath)) 664 d->dev = dev; 665 } else if (is_pci_dev(dev)) { 666 if (match_pci_device(dev, d->index, d->modpath)) 667 d->dev = dev; 668 } else if (dev->bus == NULL) { 669 /* we are on a bus bridge */ 670 struct device *new = parse_tree_node(dev, d->index, d->modpath); 671 if (new) 672 d->dev = new; 673 } 674 } 675 return d->dev != NULL; 676} 677 678/** 679 * parse_tree_node - returns a device entry in the iotree 680 * @parent: the parent node in the tree 681 * @index: the current BC index 682 * @modpath: the hardware_path struct to match a device against 683 * @return: The corresponding device if found, NULL otherwise. 684 * 685 * Checks all the children of @parent for a matching @id. If none 686 * found, it returns NULL. 687 */ 688static struct device * 689parse_tree_node(struct device *parent, int index, struct hardware_path *modpath) 690{ 691 struct parse_tree_data d = { 692 .index = index, 693 .modpath = modpath, 694 }; 695 696 struct recurse_struct recurse_data = { 697 .obj = &d, 698 .fn = check_parent, 699 }; 700 701 if (device_for_each_child(parent, &recurse_data, descend_children)) 702 /* nothing */; 703 704 return d.dev; 705} 706 707/** 708 * hwpath_to_device - Finds the generic device corresponding to a given hardware path. 709 * @modpath: the hardware path. 710 * @return: The target device, NULL if not found. 711 */ 712struct device *hwpath_to_device(struct hardware_path *modpath) 713{ 714 int i; 715 struct device *parent = &root; 716 for (i = 0; i < 6; i++) { 717 if (modpath->bc[i] == -1) 718 continue; 719 parent = parse_tree_node(parent, i, modpath); 720 if (!parent) 721 return NULL; 722 } 723 if (is_pci_dev(parent)) /* pci devices already parse MOD */ 724 return parent; 725 else 726 return parse_tree_node(parent, 6, modpath); 727} 728EXPORT_SYMBOL(hwpath_to_device); 729 730/** 731 * device_to_hwpath - Populates the hwpath corresponding to the given device. 732 * @param dev the target device 733 * @param path pointer to a previously allocated hwpath struct to be filled in 734 */ 735void device_to_hwpath(struct device *dev, struct hardware_path *path) 736{ 737 struct parisc_device *padev; 738 if (dev->bus == &parisc_bus_type) { 739 padev = to_parisc_device(dev); 740 get_node_path(dev->parent, path); 741 path->mod = padev->hw_path; 742 } else if (is_pci_dev(dev)) { 743 get_node_path(dev, path); 744 } 745} 746EXPORT_SYMBOL(device_to_hwpath); 747 748#define BC_PORT_MASK 0x8 749#define BC_LOWER_PORT 0x8 750 751#define BUS_CONVERTER(dev) \ 752 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT)) 753 754#define IS_LOWER_PORT(dev) \ 755 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \ 756 & BC_PORT_MASK) == BC_LOWER_PORT) 757 758#define MAX_NATIVE_DEVICES 64 759#define NATIVE_DEVICE_OFFSET 0x1000 760 761#define FLEX_MASK F_EXTEND(0xfffc0000) 762#define IO_IO_LOW offsetof(struct bc_module, io_io_low) 763#define IO_IO_HIGH offsetof(struct bc_module, io_io_high) 764#define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW) 765#define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH) 766 767static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high, 768 struct device *parent); 769 770void walk_lower_bus(struct parisc_device *dev) 771{ 772 unsigned long io_io_low, io_io_high; 773 774 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev)) 775 return; 776 777 if (dev->id.hw_type == HPHW_IOA) { 778 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16); 779 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET; 780 } else { 781 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK; 782 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK; 783 } 784 785 walk_native_bus(io_io_low, io_io_high, &dev->dev); 786} 787 788/** 789 * walk_native_bus -- Probe a bus for devices 790 * @io_io_low: Base address of this bus. 791 * @io_io_high: Last address of this bus. 792 * @parent: The parent bus device. 793 * 794 * A native bus (eg Runway or GSC) may have up to 64 devices on it, 795 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these 796 * devices, so we have to probe for them. Unfortunately, we may find 797 * devices which are not physically connected (such as extra serial & 798 * keyboard ports). This problem is not yet solved. 799 */ 800static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high, 801 struct device *parent) 802{ 803 int i, devices_found = 0; 804 unsigned long hpa = io_io_low; 805 struct hardware_path path; 806 807 get_node_path(parent, &path); 808 do { 809 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) { 810 struct parisc_device *dev; 811 812 /* Was the device already added by Firmware? */ 813 dev = find_device_by_addr(hpa); 814 if (!dev) { 815 path.mod = i; 816 dev = alloc_pa_dev(hpa, &path); 817 if (!dev) 818 continue; 819 820 register_parisc_device(dev); 821 devices_found++; 822 } 823 walk_lower_bus(dev); 824 } 825 } while(!devices_found && hpa < io_io_high); 826} 827 828#define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000) 829 830/** 831 * walk_central_bus - Find devices attached to the central bus 832 * 833 * PDC doesn't tell us about all devices in the system. This routine 834 * finds devices connected to the central bus. 835 */ 836void walk_central_bus(void) 837{ 838 walk_native_bus(CENTRAL_BUS_ADDR, 839 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET), 840 &root); 841} 842 843static void print_parisc_device(struct parisc_device *dev) 844{ 845 char hw_path[64]; 846 static int count; 847 848 print_pa_hwpath(dev, hw_path); 849 printk(KERN_INFO "%d. %s at 0x%p [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }", 850 ++count, dev->name, (void*) dev->hpa.start, hw_path, dev->id.hw_type, 851 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion); 852 853 if (dev->num_addrs) { 854 int k; 855 printk(", additional addresses: "); 856 for (k = 0; k < dev->num_addrs; k++) 857 printk("0x%lx ", dev->addr[k]); 858 } 859 printk("\n"); 860} 861 862/** 863 * init_parisc_bus - Some preparation to be done before inventory 864 */ 865void init_parisc_bus(void) 866{ 867 if (bus_register(&parisc_bus_type)) 868 panic("Could not register PA-RISC bus type\n"); 869 if (device_register(&root)) 870 panic("Could not register PA-RISC root device\n"); 871 get_device(&root); 872} 873 874 875static int print_one_device(struct device * dev, void * data) 876{ 877 struct parisc_device * pdev = to_parisc_device(dev); 878 879 if (check_dev(dev)) 880 print_parisc_device(pdev); 881 return 0; 882} 883 884/** 885 * print_parisc_devices - Print out a list of devices found in this system 886 */ 887void print_parisc_devices(void) 888{ 889 for_each_padev(print_one_device, NULL); 890} 891