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) 2001-2023 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 <linux/dma-map-ops.h>
  34#include <asm/hardware.h>
  35#include <asm/io.h>
  36#include <asm/pdc.h>
  37#include <asm/parisc-device.h>
  38#include <asm/ropes.h>
  39
  40/* See comments in include/asm-parisc/pci.h */
  41const struct dma_map_ops *hppa_dma_ops __ro_after_init;
  42EXPORT_SYMBOL(hppa_dma_ops);
  43
  44static struct device root = {
  45	.init_name = "parisc",
  46};
  47
  48static inline int check_dev(struct device *dev)
  49{
  50	if (dev->bus == &parisc_bus_type) {
  51		struct parisc_device *pdev;
  52		pdev = to_parisc_device(dev);
  53		return pdev->id.hw_type != HPHW_FAULTY;
  54	}
  55	return 1;
  56}
  57
  58static struct device *
  59parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
  60
  61struct recurse_struct {
  62	void * obj;
  63	int (*fn)(struct device *, void *);
  64};
  65
  66static int descend_children(struct device * dev, void * data)
  67{
  68	struct recurse_struct * recurse_data = (struct recurse_struct *)data;
  69
  70	if (recurse_data->fn(dev, recurse_data->obj))
  71		return 1;
  72	else
  73		return device_for_each_child(dev, recurse_data, descend_children);
  74}
  75
  76/**
  77 * for_each_padev - Iterate over all devices in the tree
  78 * @fn: Function to call for each device.
  79 * @data: Data to pass to the called function.
  80 *
  81 * This performs a depth-first traversal of the tree, calling the
  82 * function passed for each node.  It calls the function for parents
  83 * before children.
  84 */
  85
  86static int for_each_padev(int (*fn)(struct device *, void *), void * data)
  87{
  88	struct recurse_struct recurse_data = {
  89		.obj	= data,
  90		.fn	= fn,
  91	};
  92	return device_for_each_child(&root, &recurse_data, descend_children);
  93}
  94
  95/**
  96 * match_device - Report whether this driver can handle this device
  97 * @driver: the PA-RISC driver to try
  98 * @dev: the PA-RISC device to try
  99 */
 100static int match_device(const struct parisc_driver *driver, struct parisc_device *dev)
 101{
 102	const struct parisc_device_id *ids;
 103
 104	for (ids = driver->id_table; ids->sversion; ids++) {
 105		if ((ids->sversion != SVERSION_ANY_ID) &&
 106		    (ids->sversion != dev->id.sversion))
 107			continue;
 108
 109		if ((ids->hw_type != HWTYPE_ANY_ID) &&
 110		    (ids->hw_type != dev->id.hw_type))
 111			continue;
 112
 113		if ((ids->hversion != HVERSION_ANY_ID) &&
 114		    (ids->hversion != dev->id.hversion))
 115			continue;
 116
 117		return 1;
 118	}
 119	return 0;
 120}
 121
 122static int parisc_driver_probe(struct device *dev)
 123{
 124	int rc;
 125	struct parisc_device *pa_dev = to_parisc_device(dev);
 126	struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
 127
 128	rc = pa_drv->probe(pa_dev);
 129
 130	if (!rc)
 131		pa_dev->driver = pa_drv;
 132
 133	return rc;
 134}
 135
 136static void __exit parisc_driver_remove(struct device *dev)
 137{
 138	struct parisc_device *pa_dev = to_parisc_device(dev);
 139	struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
 140
 141	if (pa_drv->remove)
 142		pa_drv->remove(pa_dev);
 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 */
 150int 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}
 175EXPORT_SYMBOL(register_parisc_driver);
 176
 177
 178struct match_count {
 179	struct parisc_driver * driver;
 180	int count;
 181};
 182
 183static 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 */
 202int __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 */
 220int unregister_parisc_driver(struct parisc_driver *driver)
 221{
 222	driver_unregister(&driver->drv);
 223	return 0;
 224}
 225EXPORT_SYMBOL(unregister_parisc_driver);
 226
 227struct find_data {
 228	unsigned long hpa;
 229	struct parisc_device * dev;
 230};
 231
 232static 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
 246static 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
 257static 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
 273int __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 * @padev: 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 */
 289const struct parisc_device *
 290find_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 */
 310static 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
 333static 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 */
 354char *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}
 362EXPORT_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 */
 374void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
 375{
 376	get_node_path(&pdev->dev, path);
 377}
 378EXPORT_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 */
 389char *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}
 396EXPORT_SYMBOL(print_pci_hwpath);
 397
 398#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
 399
 400static 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
 418static struct parisc_device * __init create_tree_node(char id,
 419						      struct device *parent)
 420{
 421	struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 422	if (!dev)
 423		return NULL;
 424
 425	dev->hw_path = id;
 426	dev->id.hw_type = HPHW_FAULTY;
 427
 428	dev->dev.parent = parent;
 429	setup_bus_id(dev);
 430
 431	dev->dev.bus = &parisc_bus_type;
 432	dev->dma_mask = 0xffffffffUL;	/* PARISC devices are 32-bit */
 433
 434	/* make the generic dma mask a pointer to the parisc one */
 435	dev->dev.dma_mask = &dev->dma_mask;
 436	dev->dev.coherent_dma_mask = dev->dma_mask;
 437	if (device_register(&dev->dev)) {
 438		kfree(dev);
 439		return NULL;
 440	}
 441
 442	return dev;
 443}
 444
 445struct match_id_data {
 446	char id;
 447	struct parisc_device * dev;
 448};
 449
 450static int match_by_id(struct device * dev, void * data)
 451{
 452	struct parisc_device * pdev = to_parisc_device(dev);
 453	struct match_id_data * d = data;
 454
 455	if (pdev->hw_path == d->id) {
 456		d->dev = pdev;
 457		return 1;
 458	}
 459	return 0;
 460}
 461
 462/**
 463 * alloc_tree_node - returns a device entry in the iotree
 464 * @parent: the parent node in the tree
 465 * @id: the element of the module path for this entry
 466 *
 467 * Checks all the children of @parent for a matching @id.  If none
 468 * found, it allocates a new device and returns it.
 469 */
 470static struct parisc_device * __init alloc_tree_node(
 471			struct device *parent, char id)
 472{
 473	struct match_id_data d = {
 474		.id = id,
 475	};
 476	if (device_for_each_child(parent, &d, match_by_id))
 477		return d.dev;
 478	else
 479		return create_tree_node(id, parent);
 480}
 481
 482static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
 483{
 484	int i;
 485	struct device *parent = &root;
 486	for (i = 0; i < 6; i++) {
 487		if (modpath->bc[i] == -1)
 488			continue;
 489		parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
 490	}
 491	return alloc_tree_node(parent, modpath->mod);
 492}
 493
 494struct parisc_device * __init
 495alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
 496{
 497	int status;
 498	unsigned long bytecnt;
 499	u8 iodc_data[32];
 500	struct parisc_device *dev;
 501	const char *name;
 502
 503	/* Check to make sure this device has not already been added - Ryan */
 504	if (find_device_by_addr(hpa) != NULL)
 505		return NULL;
 506
 507	status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
 508	if (status != PDC_OK)
 509		return NULL;
 510
 511	dev = create_parisc_device(mod_path);
 512	if (dev->id.hw_type != HPHW_FAULTY) {
 513		pr_err("Two devices have hardware path [%s].  IODC data for second device: %7phN\n"
 514		       "Rearranging GSC cards sometimes helps\n",
 515			parisc_pathname(dev), iodc_data);
 516		return NULL;
 517	}
 518
 519	dev->id.hw_type = iodc_data[3] & 0x1f;
 520	dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
 521	dev->id.hversion_rev = iodc_data[1] & 0x0f;
 522	dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
 523			(iodc_data[5] << 8) | iodc_data[6];
 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	dev->hpa.name = dev->name;
 538	name = parisc_hardware_description(&dev->id) ? : "unknown";
 539	snprintf(dev->name, sizeof(dev->name), "%s [%s]",
 540		name, parisc_pathname(dev));
 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
 551static int parisc_generic_match(struct device *dev, const struct device_driver *drv)
 552{
 553	return match_device(to_parisc_driver(drv), to_parisc_device(dev));
 554}
 555
 556static ssize_t make_modalias(const 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
 566static int parisc_uevent(const 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)				\
 589static 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}									\
 594static DEVICE_ATTR_RO(name);
 595
 596#define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
 597
 598pa_dev_attr(irq, irq, "%u\n");
 599pa_dev_attr_id(hw_type, "0x%02x\n");
 600pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
 601pa_dev_attr_id(hversion, "0x%03x\n");
 602pa_dev_attr_id(sversion, "0x%05x\n");
 603
 604static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 605{
 606	return make_modalias(dev, buf);
 607}
 608static DEVICE_ATTR_RO(modalias);
 609
 610static 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};
 619ATTRIBUTE_GROUPS(parisc_device);
 620
 621const 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 */
 637int __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 */
 656static 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 */
 685static 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
 694struct parse_tree_data {
 695	int index;
 696	struct hardware_path * modpath;
 697	struct device * dev;
 698};
 699
 700static 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 */
 731static struct device *
 732parse_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 */
 755struct 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}
 771EXPORT_SYMBOL(hwpath_to_device);
 772
 773/**
 774 * device_to_hwpath - Populates the hwpath corresponding to the given device.
 775 * @dev: the target device
 776 * @path: pointer to a previously allocated hwpath struct to be filled in
 777 */
 778void 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}
 789EXPORT_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
 810static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
 811                            struct device *parent);
 812
 813static 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 */
 843static 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 */
 879void __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
 886static __init void print_parisc_device(struct parisc_device *dev)
 887{
 888	static int count __initdata;
 889
 890	pr_info("%d. %s at %pap { type:%d, hv:%#x, sv:%#x, rev:%#x }",
 891		++count, dev->name, &(dev->hpa.start), dev->id.hw_type,
 892		dev->id.hversion, dev->id.sversion, dev->id.hversion_rev);
 893
 894	if (dev->num_addrs) {
 895		int k;
 896		pr_cont(", additional addresses: ");
 897		for (k = 0; k < dev->num_addrs; k++)
 898			pr_cont("0x%lx ", dev->addr[k]);
 899	}
 900	pr_cont("\n");
 901}
 902
 903/**
 904 * init_parisc_bus - Some preparation to be done before inventory
 905 */
 906void __init init_parisc_bus(void)
 907{
 908	if (bus_register(&parisc_bus_type))
 909		panic("Could not register PA-RISC bus type\n");
 910	if (device_register(&root))
 911		panic("Could not register PA-RISC root device\n");
 912	get_device(&root);
 913}
 914
 915static __init void qemu_header(void)
 916{
 917	int num;
 918	unsigned long *p;
 919
 920	pr_info("--- cut here ---\n");
 921	pr_info("/* AUTO-GENERATED HEADER FILE FOR SEABIOS FIRMWARE */\n");
 922	pr_cont("/* generated with Linux kernel */\n");
 923	pr_cont("/* search for PARISC_QEMU_MACHINE_HEADER in Linux */\n\n");
 924
 925	pr_info("#define PARISC_MODEL \"%s\"\n\n",
 926			boot_cpu_data.pdc.sys_model_name);
 927
 928	#define p ((unsigned long *)&boot_cpu_data.pdc.model)
 929	pr_info("#define PARISC_PDC_MODEL 0x%lx, 0x%lx, 0x%lx, "
 930		"0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx\n\n",
 931		p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9]);
 932	#undef p
 933
 934	pr_info("#define PARISC_PDC_VERSION 0x%04lx\n\n",
 935			boot_cpu_data.pdc.versions);
 936
 937	pr_info("#define PARISC_PDC_CPUID 0x%04lx\n\n",
 938			boot_cpu_data.pdc.cpuid);
 939
 940	pr_info("#define PARISC_PDC_CAPABILITIES 0x%04lx\n\n",
 941			boot_cpu_data.pdc.capabilities);
 942
 943	pr_info("#define PARISC_PDC_ENTRY_ORG 0x%04lx\n\n",
 944#ifdef CONFIG_64BIT
 945		(unsigned long)(PAGE0->mem_pdc_hi) << 32 |
 946#endif
 947		(unsigned long)PAGE0->mem_pdc);
 948
 949	pr_info("#define PARISC_PDC_CACHE_INFO");
 950	p = (unsigned long *) &cache_info;
 951	for (num = 0; num < sizeof(cache_info); num += sizeof(unsigned long)) {
 952		if (((num % 5) == 0)) {
 953			pr_cont(" \\\n");
 954			pr_info("\t");
 955		}
 956		pr_cont("%s0x%04lx",
 957			num?", ":"", *p++);
 958	}
 959	pr_cont("\n\n");
 960}
 961
 962static __init int qemu_print_hpa(struct device *lin_dev, void *data)
 963{
 964	struct parisc_device *dev = to_parisc_device(lin_dev);
 965	unsigned long hpa = dev->hpa.start;
 966
 967	pr_cont("\t{\t.hpa = 0x%08lx,\\\n", hpa);
 968	pr_cont("\t\t.iodc = &iodc_data_hpa_%08lx,\\\n", hpa);
 969	pr_cont("\t\t.mod_info = &mod_info_hpa_%08lx,\\\n", hpa);
 970	pr_cont("\t\t.mod_path = &mod_path_hpa_%08lx,\\\n", hpa);
 971	pr_cont("\t\t.num_addr = HPA_%08lx_num_addr,\\\n", hpa);
 972	pr_cont("\t\t.add_addr = { HPA_%08lx_add_addr } },\\\n", hpa);
 973	return 0;
 974}
 975
 976
 977static __init void qemu_footer(void)
 978{
 979	pr_info("\n\n#define PARISC_DEVICE_LIST \\\n");
 980	for_each_padev(qemu_print_hpa, NULL);
 981	pr_cont("\t{ 0, }\n");
 982	pr_info("--- cut here ---\n");
 983}
 984
 985/* print iodc data of the various hpa modules for qemu inclusion */
 986static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
 987{
 988	struct parisc_device *dev = to_parisc_device(lin_dev);
 989	unsigned long count;
 990	unsigned long hpa = dev->hpa.start;
 991	int status;
 992	struct pdc_iodc iodc_data;
 993
 994	int mod_index;
 995	struct pdc_system_map_mod_info pdc_mod_info;
 996	struct pdc_module_path mod_path;
 997
 998	status = pdc_iodc_read(&count, hpa, 0,
 999		&iodc_data, sizeof(iodc_data));
1000	if (status != PDC_OK) {
1001		pr_info("No IODC data for hpa 0x%08lx\n", hpa);
1002		return 0;
1003	}
1004
1005	pr_info("\n");
1006
1007	/* Prevent hung task messages when printing on serial console */
1008	cond_resched();
1009
1010	pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n",
1011		hpa, parisc_hardware_description(&dev->id));
1012
1013	mod_index = 0;
1014	do {
1015		status = pdc_system_map_find_mods(&pdc_mod_info,
1016				&mod_path, mod_index++);
1017	} while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);
1018
1019	pr_info("static struct pdc_system_map_mod_info"
1020		" mod_info_hpa_%08lx = {\n", hpa);
1021	#define DO(member) \
1022		pr_cont("\t." #member " = 0x%x,\n", \
1023			(unsigned int)pdc_mod_info.member)
1024	DO(mod_addr);
1025	DO(mod_pgs);
1026	DO(add_addrs);
1027	pr_cont("};\n");
1028	#undef DO
1029	pr_info("static struct pdc_module_path "
1030		"mod_path_hpa_%08lx = {\n", hpa);
1031	pr_cont("\t.path = { ");
1032	pr_cont(".flags = 0x%x, ", mod_path.path.flags);
1033	pr_cont(".bc = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }, ",
1034		(unsigned char)mod_path.path.bc[0],
1035		(unsigned char)mod_path.path.bc[1],
1036		(unsigned char)mod_path.path.bc[2],
1037		(unsigned char)mod_path.path.bc[3],
1038		(unsigned char)mod_path.path.bc[4],
1039		(unsigned char)mod_path.path.bc[5]);
1040	pr_cont(".mod = 0x%x ", mod_path.path.mod);
1041	pr_cont(" },\n");
1042	pr_cont("\t.layers = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }\n",
1043		mod_path.layers[0], mod_path.layers[1], mod_path.layers[2],
1044		mod_path.layers[3], mod_path.layers[4], mod_path.layers[5]);
1045	pr_cont("};\n");
1046
1047	pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n", hpa);
1048	#define DO(member) \
1049		pr_cont("\t." #member " = 0x%04lx,\n", \
1050			(unsigned long)iodc_data.member)
1051	DO(hversion_model);
1052	DO(hversion);
1053	DO(spa);
1054	DO(type);
1055	DO(sversion_rev);
1056	DO(sversion_model);
1057	DO(sversion_opt);
1058	DO(rev);
1059	DO(dep);
1060	DO(features);
1061	DO(checksum);
1062	DO(length);
1063	#undef DO
1064	pr_cont("\t/* pad: 0x%04x, 0x%04x */\n",
1065		iodc_data.pad[0], iodc_data.pad[1]);
1066	pr_cont("};\n");
1067
1068	pr_info("#define HPA_%08lx_num_addr %d\n", hpa, dev->num_addrs);
1069	pr_info("#define HPA_%08lx_add_addr ", hpa);
1070	count = 0;
1071	if (dev->num_addrs == 0)
1072		pr_cont("0");
1073	while (count < dev->num_addrs) {
1074		pr_cont("0x%08lx, ", dev->addr[count]);
1075		count++;
1076	}
1077	pr_cont("\n\n");
1078
1079	return 0;
1080}
1081
1082
1083
1084static __init int print_one_device(struct device * dev, void * data)
1085{
1086	struct parisc_device * pdev = to_parisc_device(dev);
1087
1088	if (check_dev(dev))
1089		print_parisc_device(pdev);
1090	return 0;
1091}
1092
1093/**
1094 * print_parisc_devices - Print out a list of devices found in this system
1095 */
1096void __init print_parisc_devices(void)
1097{
1098	for_each_padev(print_one_device, NULL);
1099	#define PARISC_QEMU_MACHINE_HEADER 0
1100	if (PARISC_QEMU_MACHINE_HEADER) {
1101		qemu_header();
1102		for_each_padev(qemu_print_iodc_data, NULL);
1103		qemu_footer();
1104	}
1105}