arch/parisc/kernel/drivers.c

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This source file includes following definitions.
check_dev
descend_children
for_each_padev
match_device
parisc_driver_probe
parisc_driver_remove
register_parisc_driver
match_and_count
count_parisc_driver
unregister_parisc_driver
find_device
find_device_by_addr
is_IKE_device
machine_has_merced_bus
find_pa_parent_type
get_node_path
print_hwpath
print_pa_hwpath
get_pci_node_path
print_pci_hwpath
setup_bus_id
create_tree_node
match_by_id
alloc_tree_node
create_parisc_device
alloc_pa_dev
parisc_generic_match
make_modalias
parisc_uevent
modalias_show
register_parisc_device
match_pci_device
match_parisc_device
check_parent
parse_tree_node
hwpath_to_device
device_to_hwpath
walk_lower_bus
walk_native_bus
walk_central_bus
print_parisc_device
init_parisc_bus
qemu_header
qemu_print_hpa
qemu_footer
qemu_print_iodc_data
print_one_device
print_parisc_devices
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers.c
   4  *
   5  * Copyright (c) 1999 The Puffin Group
   6  * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
   7  * Copyright (c) 2001 Helge Deller <deller@gmx.de>
   8  * Copyright (c) 2001,2002 Ryan Bradetich 
   9  * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org>
  10  * 
  11  * The file handles registering devices and drivers, then matching them.
  12  * It's the closest we get to a dating agency.
  13  *
  14  * If you're thinking about modifying this file, here are some gotchas to
  15  * bear in mind:
  16  *  - 715/Mirage device paths have a dummy device between Lasi and its children
  17  *  - The EISA adapter may show up as a sibling or child of Wax
  18  *  - Dino has an optionally functional serial port.  If firmware enables it,
  19  *    it shows up as a child of Dino.  If firmware disables it, the buswalk
  20  *    finds it and it shows up as a child of Cujo
  21  *  - Dino has both parisc and pci devices as children
  22  *  - parisc devices are discovered in a random order, including children
  23  *    before parents in some cases.
  24  */
  25 
  26 #include <linux/slab.h>
  27 #include <linux/types.h>
  28 #include <linux/kernel.h>
  29 #include <linux/pci.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/string.h>
  32 #include <linux/export.h>
  33 #include <asm/hardware.h>
  34 #include <asm/io.h>
  35 #include <asm/pdc.h>
  36 #include <asm/parisc-device.h>
  37 #include <asm/ropes.h>
  38 
  39 /* See comments in include/asm-parisc/pci.h */
  40 const struct dma_map_ops *hppa_dma_ops __ro_after_init;
  41 EXPORT_SYMBOL(hppa_dma_ops);
  42 
  43 static struct device root = {
  44         .init_name = "parisc",
  45 };
  46 
  47 static inline int check_dev(struct device *dev)
  48 {
  49         if (dev->bus == &parisc_bus_type) {
  50                 struct parisc_device *pdev;
  51                 pdev = to_parisc_device(dev);
  52                 return pdev->id.hw_type != HPHW_FAULTY;
  53         }
  54         return 1;
  55 }
  56 
  57 static struct device *
  58 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
  59 
  60 struct recurse_struct {
  61         void * obj;
  62         int (*fn)(struct device *, void *);
  63 };
  64 
  65 static int descend_children(struct device * dev, void * data)
  66 {
  67         struct recurse_struct * recurse_data = (struct recurse_struct *)data;
  68 
  69         if (recurse_data->fn(dev, recurse_data->obj))
  70                 return 1;
  71         else
  72                 return device_for_each_child(dev, recurse_data, descend_children);
  73 }
  74 
  75 /**
  76  *      for_each_padev - Iterate over all devices in the tree
  77  *      @fn:    Function to call for each device.
  78  *      @data:  Data to pass to the called function.
  79  *
  80  *      This performs a depth-first traversal of the tree, calling the
  81  *      function passed for each node.  It calls the function for parents
  82  *      before children.
  83  */
  84 
  85 static int for_each_padev(int (*fn)(struct device *, void *), void * data)
  86 {
  87         struct recurse_struct recurse_data = {
  88                 .obj    = data,
  89                 .fn     = fn,
  90         };
  91         return device_for_each_child(&root, &recurse_data, descend_children);
  92 }
  93 
  94 /**
  95  * match_device - Report whether this driver can handle this device
  96  * @driver: the PA-RISC driver to try
  97  * @dev: the PA-RISC device to try
  98  */
  99 static int match_device(struct parisc_driver *driver, struct parisc_device *dev)
 100 {
 101         const struct parisc_device_id *ids;
 102 
 103         for (ids = driver->id_table; ids->sversion; ids++) {
 104                 if ((ids->sversion != SVERSION_ANY_ID) &&
 105                     (ids->sversion != dev->id.sversion))
 106                         continue;
 107 
 108                 if ((ids->hw_type != HWTYPE_ANY_ID) &&
 109                     (ids->hw_type != dev->id.hw_type))
 110                         continue;
 111 
 112                 if ((ids->hversion != HVERSION_ANY_ID) &&
 113                     (ids->hversion != dev->id.hversion))
 114                         continue;
 115 
 116                 return 1;
 117         }
 118         return 0;
 119 }
 120 
 121 static int parisc_driver_probe(struct device *dev)
 122 {
 123         int rc;
 124         struct parisc_device *pa_dev = to_parisc_device(dev);
 125         struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
 126 
 127         rc = pa_drv->probe(pa_dev);
 128 
 129         if (!rc)
 130                 pa_dev->driver = pa_drv;
 131 
 132         return rc;
 133 }
 134 
 135 static int __exit parisc_driver_remove(struct device *dev)
 136 {
 137         struct parisc_device *pa_dev = to_parisc_device(dev);
 138         struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
 139         if (pa_drv->remove)
 140                 pa_drv->remove(pa_dev);
 141 
 142         return 0;
 143 }
 144         
 145 
 146 /**
 147  * register_parisc_driver - Register this driver if it can handle a device
 148  * @driver: the PA-RISC driver to try
 149  */
 150 int register_parisc_driver(struct parisc_driver *driver)
 151 {
 152         /* FIXME: we need this because apparently the sti
 153          * driver can be registered twice */
 154         if (driver->drv.name) {
 155                 pr_warn("BUG: skipping previously registered driver %s\n",
 156                         driver->name);
 157                 return 1;
 158         }
 159 
 160         if (!driver->probe) {
 161                 pr_warn("BUG: driver %s has no probe routine\n", driver->name);
 162                 return 1;
 163         }
 164 
 165         driver->drv.bus = &parisc_bus_type;
 166 
 167         /* We install our own probe and remove routines */
 168         WARN_ON(driver->drv.probe != NULL);
 169         WARN_ON(driver->drv.remove != NULL);
 170 
 171         driver->drv.name = driver->name;
 172 
 173         return driver_register(&driver->drv);
 174 }
 175 EXPORT_SYMBOL(register_parisc_driver);
 176 
 177 
 178 struct match_count {
 179         struct parisc_driver * driver;
 180         int count;
 181 };
 182 
 183 static int match_and_count(struct device * dev, void * data)
 184 {
 185         struct match_count * m = data;
 186         struct parisc_device * pdev = to_parisc_device(dev);
 187 
 188         if (check_dev(dev)) {
 189                 if (match_device(m->driver, pdev))
 190                         m->count++;
 191         }
 192         return 0;
 193 }
 194 
 195 /**
 196  * count_parisc_driver - count # of devices this driver would match
 197  * @driver: the PA-RISC driver to try
 198  *
 199  * Use by IOMMU support to "guess" the right size IOPdir.
 200  * Formula is something like memsize/(num_iommu * entry_size).
 201  */
 202 int __init count_parisc_driver(struct parisc_driver *driver)
 203 {
 204         struct match_count m = {
 205                 .driver = driver,
 206                 .count  = 0,
 207         };
 208 
 209         for_each_padev(match_and_count, &m);
 210 
 211         return m.count;
 212 }
 213 
 214 
 215 
 216 /**
 217  * unregister_parisc_driver - Unregister this driver from the list of drivers
 218  * @driver: the PA-RISC driver to unregister
 219  */
 220 int unregister_parisc_driver(struct parisc_driver *driver)
 221 {
 222         driver_unregister(&driver->drv);
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(unregister_parisc_driver);
 226 
 227 struct find_data {
 228         unsigned long hpa;
 229         struct parisc_device * dev;
 230 };
 231 
 232 static int find_device(struct device * dev, void * data)
 233 {
 234         struct parisc_device * pdev = to_parisc_device(dev);
 235         struct find_data * d = (struct find_data*)data;
 236 
 237         if (check_dev(dev)) {
 238                 if (pdev->hpa.start == d->hpa) {
 239                         d->dev = pdev;
 240                         return 1;
 241                 }
 242         }
 243         return 0;
 244 }
 245 
 246 static struct parisc_device *find_device_by_addr(unsigned long hpa)
 247 {
 248         struct find_data d = {
 249                 .hpa    = hpa,
 250         };
 251         int ret;
 252 
 253         ret = for_each_padev(find_device, &d);
 254         return ret ? d.dev : NULL;
 255 }
 256 
 257 static int __init is_IKE_device(struct device *dev, void *data)
 258 {
 259         struct parisc_device *pdev = to_parisc_device(dev);
 260 
 261         if (!check_dev(dev))
 262                 return 0;
 263         if (pdev->id.hw_type != HPHW_BCPORT)
 264                 return 0;
 265         if (IS_IKE(pdev) ||
 266                 (pdev->id.hversion == REO_MERCED_PORT) ||
 267                 (pdev->id.hversion == REOG_MERCED_PORT)) {
 268                         return 1;
 269         }
 270         return 0;
 271 }
 272 
 273 int __init machine_has_merced_bus(void)
 274 {
 275         int ret;
 276 
 277         ret = for_each_padev(is_IKE_device, NULL);
 278         return ret ? 1 : 0;
 279 }
 280 
 281 /**
 282  * find_pa_parent_type - Find a parent of a specific type
 283  * @dev: The device to start searching from
 284  * @type: The device type to search for.
 285  *
 286  * Walks up the device tree looking for a device of the specified type.
 287  * If it finds it, it returns it.  If not, it returns NULL.
 288  */
 289 const struct parisc_device *
 290 find_pa_parent_type(const struct parisc_device *padev, int type)
 291 {
 292         const struct device *dev = &padev->dev;
 293         while (dev != &root) {
 294                 struct parisc_device *candidate = to_parisc_device(dev);
 295                 if (candidate->id.hw_type == type)
 296                         return candidate;
 297                 dev = dev->parent;
 298         }
 299 
 300         return NULL;
 301 }
 302 
 303 /*
 304  * get_node_path fills in @path with the firmware path to the device.
 305  * Note that if @node is a parisc device, we don't fill in the 'mod' field.
 306  * This is because both callers pass the parent and fill in the mod
 307  * themselves.  If @node is a PCI device, we do fill it in, even though this
 308  * is inconsistent.
 309  */
 310 static void get_node_path(struct device *dev, struct hardware_path *path)
 311 {
 312         int i = 5;
 313         memset(&path->bc, -1, 6);
 314 
 315         if (dev_is_pci(dev)) {
 316                 unsigned int devfn = to_pci_dev(dev)->devfn;
 317                 path->mod = PCI_FUNC(devfn);
 318                 path->bc[i--] = PCI_SLOT(devfn);
 319                 dev = dev->parent;
 320         }
 321 
 322         while (dev != &root) {
 323                 if (dev_is_pci(dev)) {
 324                         unsigned int devfn = to_pci_dev(dev)->devfn;
 325                         path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5);
 326                 } else if (dev->bus == &parisc_bus_type) {
 327                         path->bc[i--] = to_parisc_device(dev)->hw_path;
 328                 }
 329                 dev = dev->parent;
 330         }
 331 }
 332 
 333 static char *print_hwpath(struct hardware_path *path, char *output)
 334 {
 335         int i;
 336         for (i = 0; i < 6; i++) {
 337                 if (path->bc[i] == -1)
 338                         continue;
 339                 output += sprintf(output, "%u/", (unsigned char) path->bc[i]);
 340         }
 341         output += sprintf(output, "%u", (unsigned char) path->mod);
 342         return output;
 343 }
 344 
 345 /**
 346  * print_pa_hwpath - Returns hardware path for PA devices
 347  * dev: The device to return the path for
 348  * output: Pointer to a previously-allocated array to place the path in.
 349  *
 350  * This function fills in the output array with a human-readable path
 351  * to a PA device.  This string is compatible with that used by PDC, and
 352  * may be printed on the outside of the box.
 353  */
 354 char *print_pa_hwpath(struct parisc_device *dev, char *output)
 355 {
 356         struct hardware_path path;
 357 
 358         get_node_path(dev->dev.parent, &path);
 359         path.mod = dev->hw_path;
 360         return print_hwpath(&path, output);
 361 }
 362 EXPORT_SYMBOL(print_pa_hwpath);
 363 
 364 #if defined(CONFIG_PCI) || defined(CONFIG_ISA)
 365 /**
 366  * get_pci_node_path - Determines the hardware path for a PCI device
 367  * @pdev: The device to return the path for
 368  * @path: Pointer to a previously-allocated array to place the path in.
 369  *
 370  * This function fills in the hardware_path structure with the route to
 371  * the specified PCI device.  This structure is suitable for passing to
 372  * PDC calls.
 373  */
 374 void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
 375 {
 376         get_node_path(&pdev->dev, path);
 377 }
 378 EXPORT_SYMBOL(get_pci_node_path);
 379 
 380 /**
 381  * print_pci_hwpath - Returns hardware path for PCI devices
 382  * dev: The device to return the path for
 383  * output: Pointer to a previously-allocated array to place the path in.
 384  *
 385  * This function fills in the output array with a human-readable path
 386  * to a PCI device.  This string is compatible with that used by PDC, and
 387  * may be printed on the outside of the box.
 388  */
 389 char *print_pci_hwpath(struct pci_dev *dev, char *output)
 390 {
 391         struct hardware_path path;
 392 
 393         get_pci_node_path(dev, &path);
 394         return print_hwpath(&path, output);
 395 }
 396 EXPORT_SYMBOL(print_pci_hwpath);
 397 
 398 #endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
 399 
 400 static void setup_bus_id(struct parisc_device *padev)
 401 {
 402         struct hardware_path path;
 403         char name[28];
 404         char *output = name;
 405         int i;
 406 
 407         get_node_path(padev->dev.parent, &path);
 408 
 409         for (i = 0; i < 6; i++) {
 410                 if (path.bc[i] == -1)
 411                         continue;
 412                 output += sprintf(output, "%u:", (unsigned char) path.bc[i]);
 413         }
 414         sprintf(output, "%u", (unsigned char) padev->hw_path);
 415         dev_set_name(&padev->dev, name);
 416 }
 417 
 418 struct parisc_device * __init create_tree_node(char id, struct device *parent)
 419 {
 420         struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 421         if (!dev)
 422                 return NULL;
 423 
 424         dev->hw_path = id;
 425         dev->id.hw_type = HPHW_FAULTY;
 426 
 427         dev->dev.parent = parent;
 428         setup_bus_id(dev);
 429 
 430         dev->dev.bus = &parisc_bus_type;
 431         dev->dma_mask = 0xffffffffUL;   /* PARISC devices are 32-bit */
 432 
 433         /* make the generic dma mask a pointer to the parisc one */
 434         dev->dev.dma_mask = &dev->dma_mask;
 435         dev->dev.coherent_dma_mask = dev->dma_mask;
 436         if (device_register(&dev->dev)) {
 437                 kfree(dev);
 438                 return NULL;
 439         }
 440 
 441         return dev;
 442 }
 443 
 444 struct match_id_data {
 445         char id;
 446         struct parisc_device * dev;
 447 };
 448 
 449 static int match_by_id(struct device * dev, void * data)
 450 {
 451         struct parisc_device * pdev = to_parisc_device(dev);
 452         struct match_id_data * d = data;
 453 
 454         if (pdev->hw_path == d->id) {
 455                 d->dev = pdev;
 456                 return 1;
 457         }
 458         return 0;
 459 }
 460 
 461 /**
 462  * alloc_tree_node - returns a device entry in the iotree
 463  * @parent: the parent node in the tree
 464  * @id: the element of the module path for this entry
 465  *
 466  * Checks all the children of @parent for a matching @id.  If none
 467  * found, it allocates a new device and returns it.
 468  */
 469 static struct parisc_device * __init alloc_tree_node(
 470                         struct device *parent, char id)
 471 {
 472         struct match_id_data d = {
 473                 .id = id,
 474         };
 475         if (device_for_each_child(parent, &d, match_by_id))
 476                 return d.dev;
 477         else
 478                 return create_tree_node(id, parent);
 479 }
 480 
 481 static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
 482 {
 483         int i;
 484         struct device *parent = &root;
 485         for (i = 0; i < 6; i++) {
 486                 if (modpath->bc[i] == -1)
 487                         continue;
 488                 parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
 489         }
 490         return alloc_tree_node(parent, modpath->mod);
 491 }
 492 
 493 struct parisc_device * __init
 494 alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
 495 {
 496         int status;
 497         unsigned long bytecnt;
 498         u8 iodc_data[32];
 499         struct parisc_device *dev;
 500         const char *name;
 501 
 502         /* Check to make sure this device has not already been added - Ryan */
 503         if (find_device_by_addr(hpa) != NULL)
 504                 return NULL;
 505 
 506         status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
 507         if (status != PDC_OK)
 508                 return NULL;
 509 
 510         dev = create_parisc_device(mod_path);
 511         if (dev->id.hw_type != HPHW_FAULTY) {
 512                 pr_err("Two devices have hardware path [%s].  IODC data for second device: %7phN\n"
 513                        "Rearranging GSC cards sometimes helps\n",
 514                         parisc_pathname(dev), iodc_data);
 515                 return NULL;
 516         }
 517 
 518         dev->id.hw_type = iodc_data[3] & 0x1f;
 519         dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
 520         dev->id.hversion_rev = iodc_data[1] & 0x0f;
 521         dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
 522                         (iodc_data[5] << 8) | iodc_data[6];
 523         dev->hpa.name = parisc_pathname(dev);
 524         dev->hpa.start = hpa;
 525         /* This is awkward.  The STI spec says that gfx devices may occupy
 526          * 32MB or 64MB.  Unfortunately, we don't know how to tell whether
 527          * it's the former or the latter.  Assumptions either way can hurt us.
 528          */
 529         if (hpa == 0xf4000000 || hpa == 0xf8000000) {
 530                 dev->hpa.end = hpa + 0x03ffffff;
 531         } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
 532                 dev->hpa.end = hpa + 0x01ffffff;
 533         } else {
 534                 dev->hpa.end = hpa + 0xfff;
 535         }
 536         dev->hpa.flags = IORESOURCE_MEM;
 537         name = parisc_hardware_description(&dev->id);
 538         if (name) {
 539                 strlcpy(dev->name, name, sizeof(dev->name));
 540         }
 541 
 542         /* Silently fail things like mouse ports which are subsumed within
 543          * the keyboard controller
 544          */
 545         if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
 546                 pr_warn("Unable to claim HPA %lx for device %s\n", hpa, name);
 547 
 548         return dev;
 549 }
 550 
 551 static int parisc_generic_match(struct device *dev, struct device_driver *drv)
 552 {
 553         return match_device(to_parisc_driver(drv), to_parisc_device(dev));
 554 }
 555 
 556 static ssize_t make_modalias(struct device *dev, char *buf)
 557 {
 558         const struct parisc_device *padev = to_parisc_device(dev);
 559         const struct parisc_device_id *id = &padev->id;
 560 
 561         return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
 562                 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
 563                 (u32)id->sversion);
 564 }
 565 
 566 static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
 567 {
 568         const struct parisc_device *padev;
 569         char modalias[40];
 570 
 571         if (!dev)
 572                 return -ENODEV;
 573 
 574         padev = to_parisc_device(dev);
 575         if (!padev)
 576                 return -ENODEV;
 577 
 578         if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
 579                 return -ENOMEM;
 580 
 581         make_modalias(dev, modalias);
 582         if (add_uevent_var(env, "MODALIAS=%s", modalias))
 583                 return -ENOMEM;
 584 
 585         return 0;
 586 }
 587 
 588 #define pa_dev_attr(name, field, format_string)                         \
 589 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf)                \
 590 {                                                                       \
 591         struct parisc_device *padev = to_parisc_device(dev);            \
 592         return sprintf(buf, format_string, padev->field);               \
 593 }                                                                       \
 594 static DEVICE_ATTR_RO(name);
 595 
 596 #define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
 597 
 598 pa_dev_attr(irq, irq, "%u\n");
 599 pa_dev_attr_id(hw_type, "0x%02x\n");
 600 pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
 601 pa_dev_attr_id(hversion, "0x%03x\n");
 602 pa_dev_attr_id(sversion, "0x%05x\n");
 603 
 604 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 605 {
 606         return make_modalias(dev, buf);
 607 }
 608 static DEVICE_ATTR_RO(modalias);
 609 
 610 static struct attribute *parisc_device_attrs[] = {
 611         &dev_attr_irq.attr,
 612         &dev_attr_hw_type.attr,
 613         &dev_attr_rev.attr,
 614         &dev_attr_hversion.attr,
 615         &dev_attr_sversion.attr,
 616         &dev_attr_modalias.attr,
 617         NULL,
 618 };
 619 ATTRIBUTE_GROUPS(parisc_device);
 620 
 621 struct bus_type parisc_bus_type = {
 622         .name = "parisc",
 623         .match = parisc_generic_match,
 624         .uevent = parisc_uevent,
 625         .dev_groups = parisc_device_groups,
 626         .probe = parisc_driver_probe,
 627         .remove = __exit_p(parisc_driver_remove),
 628 };
 629 
 630 /**
 631  * register_parisc_device - Locate a driver to manage this device.
 632  * @dev: The parisc device.
 633  *
 634  * Search the driver list for a driver that is willing to manage
 635  * this device.
 636  */
 637 int __init register_parisc_device(struct parisc_device *dev)
 638 {
 639         if (!dev)
 640                 return 0;
 641 
 642         if (dev->driver)
 643                 return 1;
 644 
 645         return 0;
 646 }
 647 
 648 /**
 649  * match_pci_device - Matches a pci device against a given hardware path
 650  * entry.
 651  * @dev: the generic device (known to be contained by a pci_dev).
 652  * @index: the current BC index
 653  * @modpath: the hardware path.
 654  * @return: true if the device matches the hardware path.
 655  */
 656 static int match_pci_device(struct device *dev, int index,
 657                 struct hardware_path *modpath)
 658 {
 659         struct pci_dev *pdev = to_pci_dev(dev);
 660         int id;
 661 
 662         if (index == 5) {
 663                 /* we are at the end of the path, and on the actual device */
 664                 unsigned int devfn = pdev->devfn;
 665                 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
 666                                         (modpath->mod == PCI_FUNC(devfn)));
 667         }
 668 
 669         /* index might be out of bounds for bc[] */
 670         if (index >= 6)
 671                 return 0;
 672 
 673         id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
 674         return (modpath->bc[index] == id);
 675 }
 676 
 677 /**
 678  * match_parisc_device - Matches a parisc device against a given hardware
 679  * path entry.
 680  * @dev: the generic device (known to be contained by a parisc_device).
 681  * @index: the current BC index
 682  * @modpath: the hardware path.
 683  * @return: true if the device matches the hardware path.
 684  */
 685 static int match_parisc_device(struct device *dev, int index,
 686                 struct hardware_path *modpath)
 687 {
 688         struct parisc_device *curr = to_parisc_device(dev);
 689         char id = (index == 6) ? modpath->mod : modpath->bc[index];
 690 
 691         return (curr->hw_path == id);
 692 }
 693 
 694 struct parse_tree_data {
 695         int index;
 696         struct hardware_path * modpath;
 697         struct device * dev;
 698 };
 699 
 700 static int check_parent(struct device * dev, void * data)
 701 {
 702         struct parse_tree_data * d = data;
 703 
 704         if (check_dev(dev)) {
 705                 if (dev->bus == &parisc_bus_type) {
 706                         if (match_parisc_device(dev, d->index, d->modpath))
 707                                 d->dev = dev;
 708                 } else if (dev_is_pci(dev)) {
 709                         if (match_pci_device(dev, d->index, d->modpath))
 710                                 d->dev = dev;
 711                 } else if (dev->bus == NULL) {
 712                         /* we are on a bus bridge */
 713                         struct device *new = parse_tree_node(dev, d->index, d->modpath);
 714                         if (new)
 715                                 d->dev = new;
 716                 }
 717         }
 718         return d->dev != NULL;
 719 }
 720 
 721 /**
 722  * parse_tree_node - returns a device entry in the iotree
 723  * @parent: the parent node in the tree
 724  * @index: the current BC index
 725  * @modpath: the hardware_path struct to match a device against
 726  * @return: The corresponding device if found, NULL otherwise.
 727  *
 728  * Checks all the children of @parent for a matching @id.  If none
 729  * found, it returns NULL.
 730  */
 731 static struct device *
 732 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
 733 {
 734         struct parse_tree_data d = {
 735                 .index          = index,
 736                 .modpath        = modpath,
 737         };
 738 
 739         struct recurse_struct recurse_data = {
 740                 .obj    = &d,
 741                 .fn     = check_parent,
 742         };
 743 
 744         if (device_for_each_child(parent, &recurse_data, descend_children))
 745                 /* nothing */;
 746 
 747         return d.dev;
 748 }
 749 
 750 /**
 751  * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
 752  * @modpath: the hardware path.
 753  * @return: The target device, NULL if not found.
 754  */
 755 struct device *hwpath_to_device(struct hardware_path *modpath)
 756 {
 757         int i;
 758         struct device *parent = &root;
 759         for (i = 0; i < 6; i++) {
 760                 if (modpath->bc[i] == -1)
 761                         continue;
 762                 parent = parse_tree_node(parent, i, modpath);
 763                 if (!parent)
 764                         return NULL;
 765         }
 766         if (dev_is_pci(parent)) /* pci devices already parse MOD */
 767                 return parent;
 768         else
 769                 return parse_tree_node(parent, 6, modpath);
 770 }
 771 EXPORT_SYMBOL(hwpath_to_device);
 772 
 773 /**
 774  * device_to_hwpath - Populates the hwpath corresponding to the given device.
 775  * @param dev the target device
 776  * @param path pointer to a previously allocated hwpath struct to be filled in
 777  */
 778 void device_to_hwpath(struct device *dev, struct hardware_path *path)
 779 {
 780         struct parisc_device *padev;
 781         if (dev->bus == &parisc_bus_type) {
 782                 padev = to_parisc_device(dev);
 783                 get_node_path(dev->parent, path);
 784                 path->mod = padev->hw_path;
 785         } else if (dev_is_pci(dev)) {
 786                 get_node_path(dev, path);
 787         }
 788 }
 789 EXPORT_SYMBOL(device_to_hwpath);
 790 
 791 #define BC_PORT_MASK 0x8
 792 #define BC_LOWER_PORT 0x8
 793 
 794 #define BUS_CONVERTER(dev) \
 795         ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
 796 
 797 #define IS_LOWER_PORT(dev) \
 798         ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
 799                 & BC_PORT_MASK) == BC_LOWER_PORT)
 800 
 801 #define MAX_NATIVE_DEVICES 64
 802 #define NATIVE_DEVICE_OFFSET 0x1000
 803 
 804 #define FLEX_MASK       F_EXTEND(0xfffc0000)
 805 #define IO_IO_LOW       offsetof(struct bc_module, io_io_low)
 806 #define IO_IO_HIGH      offsetof(struct bc_module, io_io_high)
 807 #define READ_IO_IO_LOW(dev)  (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
 808 #define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
 809 
 810 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
 811                             struct device *parent);
 812 
 813 static void __init walk_lower_bus(struct parisc_device *dev)
 814 {
 815         unsigned long io_io_low, io_io_high;
 816 
 817         if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
 818                 return;
 819 
 820         if (dev->id.hw_type == HPHW_IOA) {
 821                 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
 822                 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
 823         } else {
 824                 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
 825                 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
 826         }
 827 
 828         walk_native_bus(io_io_low, io_io_high, &dev->dev);
 829 }
 830 
 831 /**
 832  * walk_native_bus -- Probe a bus for devices
 833  * @io_io_low: Base address of this bus.
 834  * @io_io_high: Last address of this bus.
 835  * @parent: The parent bus device.
 836  * 
 837  * A native bus (eg Runway or GSC) may have up to 64 devices on it,
 838  * spaced at intervals of 0x1000 bytes.  PDC may not inform us of these
 839  * devices, so we have to probe for them.  Unfortunately, we may find
 840  * devices which are not physically connected (such as extra serial &
 841  * keyboard ports).  This problem is not yet solved.
 842  */
 843 static void __init walk_native_bus(unsigned long io_io_low,
 844         unsigned long io_io_high, struct device *parent)
 845 {
 846         int i, devices_found = 0;
 847         unsigned long hpa = io_io_low;
 848         struct hardware_path path;
 849 
 850         get_node_path(parent, &path);
 851         do {
 852                 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
 853                         struct parisc_device *dev;
 854 
 855                         /* Was the device already added by Firmware? */
 856                         dev = find_device_by_addr(hpa);
 857                         if (!dev) {
 858                                 path.mod = i;
 859                                 dev = alloc_pa_dev(hpa, &path);
 860                                 if (!dev)
 861                                         continue;
 862 
 863                                 register_parisc_device(dev);
 864                                 devices_found++;
 865                         }
 866                         walk_lower_bus(dev);
 867                 }
 868         } while(!devices_found && hpa < io_io_high);
 869 }
 870 
 871 #define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
 872 
 873 /**
 874  * walk_central_bus - Find devices attached to the central bus
 875  *
 876  * PDC doesn't tell us about all devices in the system.  This routine
 877  * finds devices connected to the central bus.
 878  */
 879 void __init walk_central_bus(void)
 880 {
 881         walk_native_bus(CENTRAL_BUS_ADDR,
 882                         CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
 883                         &root);
 884 }
 885 
 886 static void print_parisc_device(struct parisc_device *dev)
 887 {
 888         char hw_path[64];
 889         static int count;
 890 
 891         print_pa_hwpath(dev, hw_path);
 892         pr_info("%d. %s at %pap [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }",
 893                 ++count, dev->name, &(dev->hpa.start), hw_path, dev->id.hw_type,
 894                 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion);
 895 
 896         if (dev->num_addrs) {
 897                 int k;
 898                 pr_cont(", additional addresses: ");
 899                 for (k = 0; k < dev->num_addrs; k++)
 900                         pr_cont("0x%lx ", dev->addr[k]);
 901         }
 902         pr_cont("\n");
 903 }
 904 
 905 /**
 906  * init_parisc_bus - Some preparation to be done before inventory
 907  */
 908 void __init init_parisc_bus(void)
 909 {
 910         if (bus_register(&parisc_bus_type))
 911                 panic("Could not register PA-RISC bus type\n");
 912         if (device_register(&root))
 913                 panic("Could not register PA-RISC root device\n");
 914         get_device(&root);
 915 }
 916 
 917 static __init void qemu_header(void)
 918 {
 919         int num;
 920         unsigned long *p;
 921 
 922         pr_info("--- cut here ---\n");
 923         pr_info("/* AUTO-GENERATED HEADER FILE FOR SEABIOS FIRMWARE */\n");
 924         pr_cont("/* generated with Linux kernel */\n");
 925         pr_cont("/* search for PARISC_QEMU_MACHINE_HEADER in Linux */\n\n");
 926 
 927         pr_info("#define PARISC_MODEL \"%s\"\n\n",
 928                         boot_cpu_data.pdc.sys_model_name);
 929 
 930         pr_info("#define PARISC_PDC_MODEL 0x%lx, 0x%lx, 0x%lx, "
 931                 "0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx\n\n",
 932         #define p ((unsigned long *)&boot_cpu_data.pdc.model)
 933                 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
 934         #undef p
 935 
 936         pr_info("#define PARISC_PDC_VERSION 0x%04lx\n\n",
 937                         boot_cpu_data.pdc.versions);
 938 
 939         pr_info("#define PARISC_PDC_CPUID 0x%04lx\n\n",
 940                         boot_cpu_data.pdc.cpuid);
 941 
 942         pr_info("#define PARISC_PDC_CAPABILITIES 0x%04lx\n\n",
 943                         boot_cpu_data.pdc.capabilities);
 944 
 945         pr_info("#define PARISC_PDC_ENTRY_ORG 0x%04lx\n\n",
 946 #ifdef CONFIG_64BIT
 947                 (unsigned long)(PAGE0->mem_pdc_hi) << 32 |
 948 #endif
 949                 (unsigned long)PAGE0->mem_pdc);
 950 
 951         pr_info("#define PARISC_PDC_CACHE_INFO");
 952         p = (unsigned long *) &cache_info;
 953         for (num = 0; num < sizeof(cache_info); num += sizeof(unsigned long)) {
 954                 if (((num % 5) == 0)) {
 955                         pr_cont(" \\\n");
 956                         pr_info("\t");
 957                 }
 958                 pr_cont("%s0x%04lx",
 959                         num?", ":"", *p++);
 960         }
 961         pr_cont("\n\n");
 962 }
 963 
 964 static __init int qemu_print_hpa(struct device *lin_dev, void *data)
 965 {
 966         struct parisc_device *dev = to_parisc_device(lin_dev);
 967         unsigned long hpa = dev->hpa.start;
 968 
 969         pr_cont("\t{\t.hpa = 0x%08lx,\\\n", hpa);
 970         pr_cont("\t\t.iodc = &iodc_data_hpa_%08lx,\\\n", hpa);
 971         pr_cont("\t\t.mod_info = &mod_info_hpa_%08lx,\\\n", hpa);
 972         pr_cont("\t\t.mod_path = &mod_path_hpa_%08lx,\\\n", hpa);
 973         pr_cont("\t\t.num_addr = HPA_%08lx_num_addr,\\\n", hpa);
 974         pr_cont("\t\t.add_addr = { HPA_%08lx_add_addr } },\\\n", hpa);
 975         return 0;
 976 }
 977 
 978 
 979 static __init void qemu_footer(void)
 980 {
 981         pr_info("\n\n#define PARISC_DEVICE_LIST \\\n");
 982         for_each_padev(qemu_print_hpa, NULL);
 983         pr_cont("\t{ 0, }\n");
 984         pr_info("--- cut here ---\n");
 985 }
 986 
 987 /* print iodc data of the various hpa modules for qemu inclusion */
 988 static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
 989 {
 990         struct parisc_device *dev = to_parisc_device(lin_dev);
 991         unsigned long count;
 992         unsigned long hpa = dev->hpa.start;
 993         int status;
 994         struct pdc_iodc iodc_data;
 995 
 996         int mod_index;
 997         struct pdc_system_map_mod_info pdc_mod_info;
 998         struct pdc_module_path mod_path;
 999 
1000         status = pdc_iodc_read(&count, hpa, 0,
1001                 &iodc_data, sizeof(iodc_data));
1002         if (status != PDC_OK) {
1003                 pr_info("No IODC data for hpa 0x%08lx\n", hpa);
1004                 return 0;
1005         }
1006 
1007         pr_info("\n");
1008 
1009         pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n",
1010                 hpa, parisc_hardware_description(&dev->id));
1011 
1012         mod_index = 0;
1013         do {
1014                 status = pdc_system_map_find_mods(&pdc_mod_info,
1015                                 &mod_path, mod_index++);
1016         } while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);
1017 
1018         pr_info("static struct pdc_system_map_mod_info"
1019                 " mod_info_hpa_%08lx = {\n", hpa);
1020         #define DO(member) \
1021                 pr_cont("\t." #member " = 0x%x,\n", \
1022                         (unsigned int)pdc_mod_info.member)
1023         DO(mod_addr);
1024         DO(mod_pgs);
1025         DO(add_addrs);
1026         pr_cont("};\n");
1027         #undef DO
1028         pr_info("static struct pdc_module_path "
1029                 "mod_path_hpa_%08lx = {\n", hpa);
1030         pr_cont("\t.path = { ");
1031         pr_cont(".flags = 0x%x, ", mod_path.path.flags);
1032         pr_cont(".bc = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }, ",
1033                 (unsigned char)mod_path.path.bc[0],
1034                 (unsigned char)mod_path.path.bc[1],
1035                 (unsigned char)mod_path.path.bc[2],
1036                 (unsigned char)mod_path.path.bc[3],
1037                 (unsigned char)mod_path.path.bc[4],
1038                 (unsigned char)mod_path.path.bc[5]);
1039         pr_cont(".mod = 0x%x ", mod_path.path.mod);
1040         pr_cont(" },\n");
1041         pr_cont("\t.layers = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }\n",
1042                 mod_path.layers[0], mod_path.layers[1], mod_path.layers[2],
1043                 mod_path.layers[3], mod_path.layers[4], mod_path.layers[5]);
1044         pr_cont("};\n");
1045 
1046         pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n", hpa);
1047         #define DO(member) \
1048                 pr_cont("\t." #member " = 0x%04lx,\n", \
1049                         (unsigned long)iodc_data.member)
1050         DO(hversion_model);
1051         DO(hversion);
1052         DO(spa);
1053         DO(type);
1054         DO(sversion_rev);
1055         DO(sversion_model);
1056         DO(sversion_opt);
1057         DO(rev);
1058         DO(dep);
1059         DO(features);
1060         DO(checksum);
1061         DO(length);
1062         #undef DO
1063         pr_cont("\t/* pad: 0x%04x, 0x%04x */\n",
1064                 iodc_data.pad[0], iodc_data.pad[1]);
1065         pr_cont("};\n");
1066 
1067         pr_info("#define HPA_%08lx_num_addr %d\n", hpa, dev->num_addrs);
1068         pr_info("#define HPA_%08lx_add_addr ", hpa);
1069         count = 0;
1070         if (dev->num_addrs == 0)
1071                 pr_cont("0");
1072         while (count < dev->num_addrs) {
1073                 pr_cont("0x%08lx, ", dev->addr[count]);
1074                 count++;
1075         }
1076         pr_cont("\n\n");
1077 
1078         return 0;
1079 }
1080 
1081 
1082 
1083 static int print_one_device(struct device * dev, void * data)
1084 {
1085         struct parisc_device * pdev = to_parisc_device(dev);
1086 
1087         if (check_dev(dev))
1088                 print_parisc_device(pdev);
1089         return 0;
1090 }
1091 
1092 /**
1093  * print_parisc_devices - Print out a list of devices found in this system
1094  */
1095 void __init print_parisc_devices(void)
1096 {
1097         for_each_padev(print_one_device, NULL);
1098         #define PARISC_QEMU_MACHINE_HEADER 0
1099         if (PARISC_QEMU_MACHINE_HEADER) {
1100                 qemu_header();
1101                 for_each_padev(qemu_print_iodc_data, NULL);
1102                 qemu_footer();
1103         }
1104 }
/* [<][>][^][v][top][bottom][index][help] */
root/arch/parisc/kernel/drivers.c

DEFINITIONS
