1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Contains common pci routines for ALL ppc platform
   4 * (based on pci_32.c and pci_64.c)
   5 *
   6 * Port for PPC64 David Engebretsen, IBM Corp.
   7 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
   8 *
   9 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
  10 *   Rework, based on alpha PCI code.
  11 *
  12 * Common pmac/prep/chrp pci routines. -- Cort
 
 
 
 
 
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/pci.h>
  17#include <linux/string.h>
  18#include <linux/init.h>
  19#include <linux/delay.h>
  20#include <linux/export.h>
  21#include <linux/of_address.h>
  22#include <linux/of_pci.h>
  23#include <linux/mm.h>
  24#include <linux/shmem_fs.h>
  25#include <linux/list.h>
  26#include <linux/syscalls.h>
  27#include <linux/irq.h>
  28#include <linux/vmalloc.h>
  29#include <linux/slab.h>
  30#include <linux/vgaarb.h>
  31#include <linux/numa.h>
  32#include <linux/msi.h>
  33#include <linux/irqdomain.h>
  34
  35#include <asm/processor.h>
  36#include <asm/io.h>
 
  37#include <asm/pci-bridge.h>
  38#include <asm/byteorder.h>
  39#include <asm/machdep.h>
  40#include <asm/ppc-pci.h>
  41#include <asm/eeh.h>
  42#include <asm/setup.h>
  43
  44#include "../../../drivers/pci/pci.h"
  45
  46/* hose_spinlock protects accesses to the phb_bitmap. */
  47static DEFINE_SPINLOCK(hose_spinlock);
  48LIST_HEAD(hose_list);
  49
  50/* For dynamic PHB numbering on get_phb_number(): max number of PHBs. */
  51#define MAX_PHBS 0x10000
  52
  53/*
  54 * For dynamic PHB numbering: used/free PHBs tracking bitmap.
  55 * Accesses to this bitmap should be protected by hose_spinlock.
  56 */
  57static DECLARE_BITMAP(phb_bitmap, MAX_PHBS);
  58
  59/* ISA Memory physical address */
  60resource_size_t isa_mem_base;
  61EXPORT_SYMBOL(isa_mem_base);
  62
  63
  64static const struct dma_map_ops *pci_dma_ops;
  65
  66void __init set_pci_dma_ops(const struct dma_map_ops *dma_ops)
  67{
  68	pci_dma_ops = dma_ops;
  69}
  70
 
 
 
 
 
 
 
 
 
 
  71static int get_phb_number(struct device_node *dn)
  72{
  73	int ret, phb_id = -1;
 
  74	u64 prop;
  75
  76	/*
  77	 * Try fixed PHB numbering first, by checking archs and reading
  78	 * the respective device-tree properties. Firstly, try reading
  79	 * standard "linux,pci-domain", then try reading "ibm,opal-phbid"
  80	 * (only present in powernv OPAL environment), then try device-tree
  81	 * alias and as the last try to use lower bits of "reg" property.
  82	 */
  83	ret = of_get_pci_domain_nr(dn);
  84	if (ret >= 0) {
  85		prop = ret;
  86		ret = 0;
  87	}
  88	if (ret)
  89		ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop);
  90
  91	if (ret) {
  92		ret = of_alias_get_id(dn, "pci");
  93		if (ret >= 0) {
  94			prop = ret;
  95			ret = 0;
  96		}
  97	}
  98	if (ret) {
  99		u32 prop_32;
 100		ret = of_property_read_u32_index(dn, "reg", 1, &prop_32);
 101		prop = prop_32;
 102	}
 103
 104	if (!ret)
 105		phb_id = (int)(prop & (MAX_PHBS - 1));
 106
 107	spin_lock(&hose_spinlock);
 108
 109	/* We need to be sure to not use the same PHB number twice. */
 110	if ((phb_id >= 0) && !test_and_set_bit(phb_id, phb_bitmap))
 111		goto out_unlock;
 112
 113	/* If everything fails then fallback to dynamic PHB numbering. */
 
 
 
 114	phb_id = find_first_zero_bit(phb_bitmap, MAX_PHBS);
 115	BUG_ON(phb_id >= MAX_PHBS);
 116	set_bit(phb_id, phb_bitmap);
 117
 118out_unlock:
 119	spin_unlock(&hose_spinlock);
 120
 121	return phb_id;
 122}
 123
 124struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
 125{
 126	struct pci_controller *phb;
 127
 128	phb = kzalloc(sizeof(struct pci_controller), GFP_KERNEL);
 129	if (phb == NULL)
 130		return NULL;
 131
 132	phb->global_number = get_phb_number(dev);
 133
 134	spin_lock(&hose_spinlock);
 
 135	list_add_tail(&phb->list_node, &hose_list);
 136	spin_unlock(&hose_spinlock);
 137
 138	phb->dn = of_node_get(dev);
 139	phb->is_dynamic = slab_is_available();
 140#ifdef CONFIG_PPC64
 141	if (dev) {
 142		int nid = of_node_to_nid(dev);
 143
 144		if (nid < 0 || !node_online(nid))
 145			nid = NUMA_NO_NODE;
 146
 147		PHB_SET_NODE(phb, nid);
 148	}
 149#endif
 150	return phb;
 151}
 152EXPORT_SYMBOL_GPL(pcibios_alloc_controller);
 153
 154void pcibios_free_controller(struct pci_controller *phb)
 155{
 156	spin_lock(&hose_spinlock);
 157
 158	/* Clear bit of phb_bitmap to allow reuse of this PHB number. */
 159	if (phb->global_number < MAX_PHBS)
 160		clear_bit(phb->global_number, phb_bitmap);
 161	of_node_put(phb->dn);
 162	list_del(&phb->list_node);
 163	spin_unlock(&hose_spinlock);
 164
 165	if (phb->is_dynamic)
 166		kfree(phb);
 167}
 168EXPORT_SYMBOL_GPL(pcibios_free_controller);
 169
 170/*
 171 * This function is used to call pcibios_free_controller()
 172 * in a deferred manner: a callback from the PCI subsystem.
 173 *
 174 * _*DO NOT*_ call pcibios_free_controller() explicitly if
 175 * this is used (or it may access an invalid *phb pointer).
 176 *
 177 * The callback occurs when all references to the root bus
 178 * are dropped (e.g., child buses/devices and their users).
 179 *
 180 * It's called as .release_fn() of 'struct pci_host_bridge'
 181 * which is associated with the 'struct pci_controller.bus'
 182 * (root bus) - it expects .release_data to hold a pointer
 183 * to 'struct pci_controller'.
 184 *
 185 * In order to use it, register .release_fn()/release_data
 186 * like this:
 187 *
 188 * pci_set_host_bridge_release(bridge,
 189 *                             pcibios_free_controller_deferred
 190 *                             (void *) phb);
 191 *
 192 * e.g. in the pcibios_root_bridge_prepare() callback from
 193 * pci_create_root_bus().
 194 */
 195void pcibios_free_controller_deferred(struct pci_host_bridge *bridge)
 196{
 197	struct pci_controller *phb = (struct pci_controller *)
 198					 bridge->release_data;
 199
 200	pr_debug("domain %d, dynamic %d\n", phb->global_number, phb->is_dynamic);
 201
 202	pcibios_free_controller(phb);
 203}
 204EXPORT_SYMBOL_GPL(pcibios_free_controller_deferred);
 205
 206/*
 207 * The function is used to return the minimal alignment
 208 * for memory or I/O windows of the associated P2P bridge.
 209 * By default, 4KiB alignment for I/O windows and 1MiB for
 210 * memory windows.
 211 */
 212resource_size_t pcibios_window_alignment(struct pci_bus *bus,
 213					 unsigned long type)
 214{
 215	struct pci_controller *phb = pci_bus_to_host(bus);
 216
 217	if (phb->controller_ops.window_alignment)
 218		return phb->controller_ops.window_alignment(bus, type);
 219
 220	/*
 221	 * PCI core will figure out the default
 222	 * alignment: 4KiB for I/O and 1MiB for
 223	 * memory window.
 224	 */
 225	return 1;
 226}
 227
 228void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
 229{
 230	struct pci_controller *hose = pci_bus_to_host(bus);
 231
 232	if (hose->controller_ops.setup_bridge)
 233		hose->controller_ops.setup_bridge(bus, type);
 234}
 235
 236void pcibios_reset_secondary_bus(struct pci_dev *dev)
 237{
 238	struct pci_controller *phb = pci_bus_to_host(dev->bus);
 239
 240	if (phb->controller_ops.reset_secondary_bus) {
 241		phb->controller_ops.reset_secondary_bus(dev);
 242		return;
 243	}
 244
 245	pci_reset_secondary_bus(dev);
 246}
 247
 248resource_size_t pcibios_default_alignment(void)
 249{
 250	if (ppc_md.pcibios_default_alignment)
 251		return ppc_md.pcibios_default_alignment();
 252
 253	return 0;
 254}
 255
 256#ifdef CONFIG_PCI_IOV
 257resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno)
 258{
 259	if (ppc_md.pcibios_iov_resource_alignment)
 260		return ppc_md.pcibios_iov_resource_alignment(pdev, resno);
 261
 262	return pci_iov_resource_size(pdev, resno);
 263}
 264
 265int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 266{
 267	if (ppc_md.pcibios_sriov_enable)
 268		return ppc_md.pcibios_sriov_enable(pdev, num_vfs);
 269
 270	return 0;
 271}
 272
 273int pcibios_sriov_disable(struct pci_dev *pdev)
 274{
 275	if (ppc_md.pcibios_sriov_disable)
 276		return ppc_md.pcibios_sriov_disable(pdev);
 277
 278	return 0;
 279}
 280
 281#endif /* CONFIG_PCI_IOV */
 282
 283static resource_size_t pcibios_io_size(const struct pci_controller *hose)
 284{
 285#ifdef CONFIG_PPC64
 286	return hose->pci_io_size;
 287#else
 288	return resource_size(&hose->io_resource);
 289#endif
 290}
 291
 292int pcibios_vaddr_is_ioport(void __iomem *address)
 293{
 294	int ret = 0;
 295	struct pci_controller *hose;
 296	resource_size_t size;
 297
 298	spin_lock(&hose_spinlock);
 299	list_for_each_entry(hose, &hose_list, list_node) {
 300		size = pcibios_io_size(hose);
 301		if (address >= hose->io_base_virt &&
 302		    address < (hose->io_base_virt + size)) {
 303			ret = 1;
 304			break;
 305		}
 306	}
 307	spin_unlock(&hose_spinlock);
 308	return ret;
 309}
 310
 311unsigned long pci_address_to_pio(phys_addr_t address)
 312{
 313	struct pci_controller *hose;
 314	resource_size_t size;
 315	unsigned long ret = ~0;
 316
 317	spin_lock(&hose_spinlock);
 318	list_for_each_entry(hose, &hose_list, list_node) {
 319		size = pcibios_io_size(hose);
 320		if (address >= hose->io_base_phys &&
 321		    address < (hose->io_base_phys + size)) {
 322			unsigned long base =
 323				(unsigned long)hose->io_base_virt - _IO_BASE;
 324			ret = base + (address - hose->io_base_phys);
 325			break;
 326		}
 327	}
 328	spin_unlock(&hose_spinlock);
 329
 330	return ret;
 331}
 332EXPORT_SYMBOL_GPL(pci_address_to_pio);
 333
 334/*
 335 * Return the domain number for this bus.
 336 */
 337int pci_domain_nr(struct pci_bus *bus)
 338{
 339	struct pci_controller *hose = pci_bus_to_host(bus);
 340
 341	return hose->global_number;
 342}
 343EXPORT_SYMBOL(pci_domain_nr);
 344
 345/* This routine is meant to be used early during boot, when the
 346 * PCI bus numbers have not yet been assigned, and you need to
 347 * issue PCI config cycles to an OF device.
 348 * It could also be used to "fix" RTAS config cycles if you want
 349 * to set pci_assign_all_buses to 1 and still use RTAS for PCI
 350 * config cycles.
 351 */
 352struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
 353{
 354	while(node) {
 355		struct pci_controller *hose, *tmp;
 356		list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 357			if (hose->dn == node)
 358				return hose;
 359		node = node->parent;
 360	}
 361	return NULL;
 362}
 363
 364struct pci_controller *pci_find_controller_for_domain(int domain_nr)
 365{
 366	struct pci_controller *hose;
 367
 368	list_for_each_entry(hose, &hose_list, list_node)
 369		if (hose->global_number == domain_nr)
 370			return hose;
 371
 372	return NULL;
 373}
 374
 375struct pci_intx_virq {
 376	int virq;
 377	struct kref kref;
 378	struct list_head list_node;
 379};
 380
 381static LIST_HEAD(intx_list);
 382static DEFINE_MUTEX(intx_mutex);
 383
 384static void ppc_pci_intx_release(struct kref *kref)
 385{
 386	struct pci_intx_virq *vi = container_of(kref, struct pci_intx_virq, kref);
 387
 388	list_del(&vi->list_node);
 389	irq_dispose_mapping(vi->virq);
 390	kfree(vi);
 391}
 392
 393static int ppc_pci_unmap_irq_line(struct notifier_block *nb,
 394			       unsigned long action, void *data)
 395{
 396	struct pci_dev *pdev = to_pci_dev(data);
 397
 398	if (action == BUS_NOTIFY_DEL_DEVICE) {
 399		struct pci_intx_virq *vi;
 400
 401		mutex_lock(&intx_mutex);
 402		list_for_each_entry(vi, &intx_list, list_node) {
 403			if (vi->virq == pdev->irq) {
 404				kref_put(&vi->kref, ppc_pci_intx_release);
 405				break;
 406			}
 407		}
 408		mutex_unlock(&intx_mutex);
 409	}
 410
 411	return NOTIFY_DONE;
 412}
 413
 414static struct notifier_block ppc_pci_unmap_irq_notifier = {
 415	.notifier_call = ppc_pci_unmap_irq_line,
 416};
 417
 418static int ppc_pci_register_irq_notifier(void)
 419{
 420	return bus_register_notifier(&pci_bus_type, &ppc_pci_unmap_irq_notifier);
 421}
 422arch_initcall(ppc_pci_register_irq_notifier);
 423
 424/*
 425 * Reads the interrupt pin to determine if interrupt is use by card.
 426 * If the interrupt is used, then gets the interrupt line from the
 427 * openfirmware and sets it in the pci_dev and pci_config line.
 428 */
 429static int pci_read_irq_line(struct pci_dev *pci_dev)
 430{
 431	int virq;
 432	struct pci_intx_virq *vi, *vitmp;
 433
 434	/* Preallocate vi as rewind is complex if this fails after mapping */
 435	vi = kzalloc(sizeof(struct pci_intx_virq), GFP_KERNEL);
 436	if (!vi)
 437		return -1;
 438
 439	pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
 440
 
 
 
 441	/* Try to get a mapping from the device-tree */
 442	virq = of_irq_parse_and_map_pci(pci_dev, 0, 0);
 443	if (virq <= 0) {
 444		u8 line, pin;
 445
 446		/* If that fails, lets fallback to what is in the config
 447		 * space and map that through the default controller. We
 448		 * also set the type to level low since that's what PCI
 449		 * interrupts are. If your platform does differently, then
 450		 * either provide a proper interrupt tree or don't use this
 451		 * function.
 452		 */
 453		if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
 454			goto error_exit;
 455		if (pin == 0)
 456			goto error_exit;
 457		if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
 458		    line == 0xff || line == 0) {
 459			goto error_exit;
 460		}
 461		pr_debug(" No map ! Using line %d (pin %d) from PCI config\n",
 462			 line, pin);
 463
 464		virq = irq_create_mapping(NULL, line);
 465		if (virq)
 466			irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
 
 
 
 
 
 
 467	}
 468
 469	if (!virq) {
 470		pr_debug(" Failed to map !\n");
 471		goto error_exit;
 472	}
 473
 474	pr_debug(" Mapped to linux irq %d\n", virq);
 475
 476	pci_dev->irq = virq;
 477
 478	mutex_lock(&intx_mutex);
 479	list_for_each_entry(vitmp, &intx_list, list_node) {
 480		if (vitmp->virq == virq) {
 481			kref_get(&vitmp->kref);
 482			kfree(vi);
 483			vi = NULL;
 484			break;
 485		}
 486	}
 487	if (vi) {
 488		vi->virq = virq;
 489		kref_init(&vi->kref);
 490		list_add_tail(&vi->list_node, &intx_list);
 491	}
 492	mutex_unlock(&intx_mutex);
 493
 494	return 0;
 495error_exit:
 496	kfree(vi);
 497	return -1;
 498}
 499
 500/*
 501 * Platform support for /proc/bus/pci/X/Y mmap()s.
 
 502 *  -- paulus.
 503 */
 504int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 505{
 506	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 507	resource_size_t ioaddr = pci_resource_start(pdev, bar);
 
 508
 509	if (!hose)
 510		return -EINVAL;
 511
 512	/* Convert to an offset within this PCI controller */
 513	ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE;
 
 
 
 
 
 
 
 
 
 514
 515	vma->vm_pgoff += (ioaddr + hose->io_base_phys) >> PAGE_SHIFT;
 516	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 517}
 518
 519/*
 520 * This one is used by /dev/mem and fbdev who have no clue about the
 521 * PCI device, it tries to find the PCI device first and calls the
 522 * above routine
 523 */
 524pgprot_t pci_phys_mem_access_prot(unsigned long pfn,
 
 525				  unsigned long size,
 526				  pgprot_t prot)
 527{
 528	struct pci_dev *pdev = NULL;
 529	struct resource *found = NULL;
 530	resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT;
 531	int i;
 532
 533	if (page_is_ram(pfn))
 534		return prot;
 535
 536	prot = pgprot_noncached(prot);
 537	for_each_pci_dev(pdev) {
 538		for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 539			struct resource *rp = &pdev->resource[i];
 540			int flags = rp->flags;
 541
 542			/* Active and same type? */
 543			if ((flags & IORESOURCE_MEM) == 0)
 544				continue;
 545			/* In the range of this resource? */
 546			if (offset < (rp->start & PAGE_MASK) ||
 547			    offset > rp->end)
 548				continue;
 549			found = rp;
 550			break;
 551		}
 552		if (found)
 553			break;
 554	}
 555	if (found) {
 556		if (found->flags & IORESOURCE_PREFETCH)
 557			prot = pgprot_noncached_wc(prot);
 558		pci_dev_put(pdev);
 559	}
 560
 561	pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n",
 562		 (unsigned long long)offset, pgprot_val(prot));
 563
 564	return prot;
 565}
 566
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 567/* This provides legacy IO read access on a bus */
 568int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
 569{
 570	unsigned long offset;
 571	struct pci_controller *hose = pci_bus_to_host(bus);
 572	struct resource *rp = &hose->io_resource;
 573	void __iomem *addr;
 574
 575	/* Check if port can be supported by that bus. We only check
 576	 * the ranges of the PHB though, not the bus itself as the rules
 577	 * for forwarding legacy cycles down bridges are not our problem
 578	 * here. So if the host bridge supports it, we do it.
 579	 */
 580	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 581	offset += port;
 582
 583	if (!(rp->flags & IORESOURCE_IO))
 584		return -ENXIO;
 585	if (offset < rp->start || (offset + size) > rp->end)
 586		return -ENXIO;
 587	addr = hose->io_base_virt + port;
 588
 589	switch(size) {
 590	case 1:
 591		*((u8 *)val) = in_8(addr);
 592		return 1;
 593	case 2:
 594		if (port & 1)
 595			return -EINVAL;
 596		*((u16 *)val) = in_le16(addr);
 597		return 2;
 598	case 4:
 599		if (port & 3)
 600			return -EINVAL;
 601		*((u32 *)val) = in_le32(addr);
 602		return 4;
 603	}
 604	return -EINVAL;
 605}
 606
 607/* This provides legacy IO write access on a bus */
 608int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
 609{
 610	unsigned long offset;
 611	struct pci_controller *hose = pci_bus_to_host(bus);
 612	struct resource *rp = &hose->io_resource;
 613	void __iomem *addr;
 614
 615	/* Check if port can be supported by that bus. We only check
 616	 * the ranges of the PHB though, not the bus itself as the rules
 617	 * for forwarding legacy cycles down bridges are not our problem
 618	 * here. So if the host bridge supports it, we do it.
 619	 */
 620	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 621	offset += port;
 622
 623	if (!(rp->flags & IORESOURCE_IO))
 624		return -ENXIO;
 625	if (offset < rp->start || (offset + size) > rp->end)
 626		return -ENXIO;
 627	addr = hose->io_base_virt + port;
 628
 629	/* WARNING: The generic code is idiotic. It gets passed a pointer
 630	 * to what can be a 1, 2 or 4 byte quantity and always reads that
 631	 * as a u32, which means that we have to correct the location of
 632	 * the data read within those 32 bits for size 1 and 2
 633	 */
 634	switch(size) {
 635	case 1:
 636		out_8(addr, val >> 24);
 637		return 1;
 638	case 2:
 639		if (port & 1)
 640			return -EINVAL;
 641		out_le16(addr, val >> 16);
 642		return 2;
 643	case 4:
 644		if (port & 3)
 645			return -EINVAL;
 646		out_le32(addr, val);
 647		return 4;
 648	}
 649	return -EINVAL;
 650}
 651
 652/* This provides legacy IO or memory mmap access on a bus */
 653int pci_mmap_legacy_page_range(struct pci_bus *bus,
 654			       struct vm_area_struct *vma,
 655			       enum pci_mmap_state mmap_state)
 656{
 657	struct pci_controller *hose = pci_bus_to_host(bus);
 658	resource_size_t offset =
 659		((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
 660	resource_size_t size = vma->vm_end - vma->vm_start;
 661	struct resource *rp;
 662
 663	pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n",
 664		 pci_domain_nr(bus), bus->number,
 665		 mmap_state == pci_mmap_mem ? "MEM" : "IO",
 666		 (unsigned long long)offset,
 667		 (unsigned long long)(offset + size - 1));
 668
 669	if (mmap_state == pci_mmap_mem) {
 670		/* Hack alert !
 671		 *
 672		 * Because X is lame and can fail starting if it gets an error trying
 673		 * to mmap legacy_mem (instead of just moving on without legacy memory
 674		 * access) we fake it here by giving it anonymous memory, effectively
 675		 * behaving just like /dev/zero
 676		 */
 677		if ((offset + size) > hose->isa_mem_size) {
 678			printk(KERN_DEBUG
 679			       "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n",
 680			       current->comm, current->pid, pci_domain_nr(bus), bus->number);
 681			if (vma->vm_flags & VM_SHARED)
 682				return shmem_zero_setup(vma);
 683			return 0;
 684		}
 685		offset += hose->isa_mem_phys;
 686	} else {
 687		unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 688		unsigned long roffset = offset + io_offset;
 689		rp = &hose->io_resource;
 690		if (!(rp->flags & IORESOURCE_IO))
 691			return -ENXIO;
 692		if (roffset < rp->start || (roffset + size) > rp->end)
 693			return -ENXIO;
 694		offset += hose->io_base_phys;
 695	}
 696	pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
 697
 698	vma->vm_pgoff = offset >> PAGE_SHIFT;
 699	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 700	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 701			       vma->vm_end - vma->vm_start,
 702			       vma->vm_page_prot);
 703}
 704
 705void pci_resource_to_user(const struct pci_dev *dev, int bar,
 706			  const struct resource *rsrc,
 707			  resource_size_t *start, resource_size_t *end)
 708{
 709	struct pci_bus_region region;
 710
 711	if (rsrc->flags & IORESOURCE_IO) {
 712		pcibios_resource_to_bus(dev->bus, &region,
 713					(struct resource *) rsrc);
 714		*start = region.start;
 715		*end = region.end;
 716		return;
 717	}
 718
 719	/* We pass a CPU physical address to userland for MMIO instead of a
 720	 * BAR value because X is lame and expects to be able to use that
 721	 * to pass to /dev/mem!
 722	 *
 723	 * That means we may have 64-bit values where some apps only expect
 724	 * 32 (like X itself since it thinks only Sparc has 64-bit MMIO).
 725	 */
 726	*start = rsrc->start;
 727	*end = rsrc->end;
 728}
 729
 730/**
 731 * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
 732 * @hose: newly allocated pci_controller to be setup
 733 * @dev: device node of the host bridge
 734 * @primary: set if primary bus (32 bits only, soon to be deprecated)
 735 *
 736 * This function will parse the "ranges" property of a PCI host bridge device
 737 * node and setup the resource mapping of a pci controller based on its
 738 * content.
 739 *
 740 * Life would be boring if it wasn't for a few issues that we have to deal
 741 * with here:
 742 *
 743 *   - We can only cope with one IO space range and up to 3 Memory space
 744 *     ranges. However, some machines (thanks Apple !) tend to split their
 745 *     space into lots of small contiguous ranges. So we have to coalesce.
 746 *
 747 *   - Some busses have IO space not starting at 0, which causes trouble with
 748 *     the way we do our IO resource renumbering. The code somewhat deals with
 749 *     it for 64 bits but I would expect problems on 32 bits.
 750 *
 751 *   - Some 32 bits platforms such as 4xx can have physical space larger than
 752 *     32 bits so we need to use 64 bits values for the parsing
 753 */
 754void pci_process_bridge_OF_ranges(struct pci_controller *hose,
 755				  struct device_node *dev, int primary)
 756{
 757	int memno = 0;
 758	struct resource *res;
 759	struct of_pci_range range;
 760	struct of_pci_range_parser parser;
 761
 762	printk(KERN_INFO "PCI host bridge %pOF %s ranges:\n",
 763	       dev, primary ? "(primary)" : "");
 764
 765	/* Check for ranges property */
 766	if (of_pci_range_parser_init(&parser, dev))
 767		return;
 768
 769	/* Parse it */
 770	for_each_of_pci_range(&parser, &range) {
 771		/* If we failed translation or got a zero-sized region
 772		 * (some FW try to feed us with non sensical zero sized regions
 773		 * such as power3 which look like some kind of attempt at exposing
 774		 * the VGA memory hole)
 775		 */
 776		if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
 777			continue;
 778
 779		/* Act based on address space type */
 780		res = NULL;
 781		switch (range.flags & IORESOURCE_TYPE_BITS) {
 782		case IORESOURCE_IO:
 783			printk(KERN_INFO
 784			       "  IO 0x%016llx..0x%016llx -> 0x%016llx\n",
 785			       range.cpu_addr, range.cpu_addr + range.size - 1,
 786			       range.pci_addr);
 787
 788			/* We support only one IO range */
 789			if (hose->pci_io_size) {
 790				printk(KERN_INFO
 791				       " \\--> Skipped (too many) !\n");
 792				continue;
 793			}
 794#ifdef CONFIG_PPC32
 795			/* On 32 bits, limit I/O space to 16MB */
 796			if (range.size > 0x01000000)
 797				range.size = 0x01000000;
 798
 799			/* 32 bits needs to map IOs here */
 800			hose->io_base_virt = ioremap(range.cpu_addr,
 801						range.size);
 802
 803			/* Expect trouble if pci_addr is not 0 */
 804			if (primary)
 805				isa_io_base =
 806					(unsigned long)hose->io_base_virt;
 807#endif /* CONFIG_PPC32 */
 808			/* pci_io_size and io_base_phys always represent IO
 809			 * space starting at 0 so we factor in pci_addr
 810			 */
 811			hose->pci_io_size = range.pci_addr + range.size;
 812			hose->io_base_phys = range.cpu_addr - range.pci_addr;
 813
 814			/* Build resource */
 815			res = &hose->io_resource;
 816			range.cpu_addr = range.pci_addr;
 817			break;
 818		case IORESOURCE_MEM:
 819			printk(KERN_INFO
 820			       " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
 821			       range.cpu_addr, range.cpu_addr + range.size - 1,
 822			       range.pci_addr,
 823			       (range.flags & IORESOURCE_PREFETCH) ?
 824			       "Prefetch" : "");
 825
 826			/* We support only 3 memory ranges */
 827			if (memno >= 3) {
 828				printk(KERN_INFO
 829				       " \\--> Skipped (too many) !\n");
 830				continue;
 831			}
 832			/* Handles ISA memory hole space here */
 833			if (range.pci_addr == 0) {
 834				if (primary || isa_mem_base == 0)
 835					isa_mem_base = range.cpu_addr;
 836				hose->isa_mem_phys = range.cpu_addr;
 837				hose->isa_mem_size = range.size;
 838			}
 839
 840			/* Build resource */
 841			hose->mem_offset[memno] = range.cpu_addr -
 842							range.pci_addr;
 843			res = &hose->mem_resources[memno++];
 844			break;
 845		}
 846		if (res != NULL) {
 847			res->name = dev->full_name;
 848			res->flags = range.flags;
 849			res->start = range.cpu_addr;
 850			res->end = range.cpu_addr + range.size - 1;
 851			res->parent = res->child = res->sibling = NULL;
 852		}
 853	}
 854}
 855
 856/* Decide whether to display the domain number in /proc */
 857int pci_proc_domain(struct pci_bus *bus)
 858{
 859	struct pci_controller *hose = pci_bus_to_host(bus);
 860
 861	if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS))
 862		return 0;
 863	if (pci_has_flag(PCI_COMPAT_DOMAIN_0))
 864		return hose->global_number != 0;
 865	return 1;
 866}
 867
 868int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 869{
 870	if (ppc_md.pcibios_root_bridge_prepare)
 871		return ppc_md.pcibios_root_bridge_prepare(bridge);
 872
 873	return 0;
 874}
 875
 876/* This header fixup will do the resource fixup for all devices as they are
 877 * probed, but not for bridge ranges
 878 */
 879static void pcibios_fixup_resources(struct pci_dev *dev)
 880{
 881	struct pci_controller *hose = pci_bus_to_host(dev->bus);
 882	struct resource *res;
 883	int i;
 884
 885	if (!hose) {
 886		printk(KERN_ERR "No host bridge for PCI dev %s !\n",
 887		       pci_name(dev));
 888		return;
 889	}
 890
 891	if (dev->is_virtfn)
 892		return;
 893
 894	pci_dev_for_each_resource(dev, res, i) {
 
 895		struct pci_bus_region reg;
 896
 897		if (!res->flags)
 898			continue;
 899
 900		/* If we're going to re-assign everything, we mark all resources
 901		 * as unset (and 0-base them). In addition, we mark BARs starting
 902		 * at 0 as unset as well, except if PCI_PROBE_ONLY is also set
 903		 * since in that case, we don't want to re-assign anything
 904		 */
 905		pcibios_resource_to_bus(dev->bus, &reg, res);
 906		if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) ||
 907		    (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) {
 908			/* Only print message if not re-assigning */
 909			if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC))
 910				pr_debug("PCI:%s Resource %d %pR is unassigned\n",
 911					 pci_name(dev), i, res);
 912			res->end -= res->start;
 913			res->start = 0;
 914			res->flags |= IORESOURCE_UNSET;
 915			continue;
 916		}
 917
 918		pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res);
 919	}
 920
 921	/* Call machine specific resource fixup */
 922	if (ppc_md.pcibios_fixup_resources)
 923		ppc_md.pcibios_fixup_resources(dev);
 924}
 925DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
 926
 927/* This function tries to figure out if a bridge resource has been initialized
 928 * by the firmware or not. It doesn't have to be absolutely bullet proof, but
 929 * things go more smoothly when it gets it right. It should covers cases such
 930 * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
 931 */
 932static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
 933						 struct resource *res)
 934{
 935	struct pci_controller *hose = pci_bus_to_host(bus);
 936	struct pci_dev *dev = bus->self;
 937	resource_size_t offset;
 938	struct pci_bus_region region;
 939	u16 command;
 940	int i;
 941
 942	/* We don't do anything if PCI_PROBE_ONLY is set */
 943	if (pci_has_flag(PCI_PROBE_ONLY))
 944		return 0;
 945
 946	/* Job is a bit different between memory and IO */
 947	if (res->flags & IORESOURCE_MEM) {
 948		pcibios_resource_to_bus(dev->bus, &region, res);
 949
 950		/* If the BAR is non-0 then it's probably been initialized */
 951		if (region.start != 0)
 952			return 0;
 953
 954		/* The BAR is 0, let's check if memory decoding is enabled on
 955		 * the bridge. If not, we consider it unassigned
 956		 */
 957		pci_read_config_word(dev, PCI_COMMAND, &command);
 958		if ((command & PCI_COMMAND_MEMORY) == 0)
 959			return 1;
 960
 961		/* Memory decoding is enabled and the BAR is 0. If any of the bridge
 962		 * resources covers that starting address (0 then it's good enough for
 963		 * us for memory space)
 964		 */
 965		for (i = 0; i < 3; i++) {
 966			if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
 967			    hose->mem_resources[i].start == hose->mem_offset[i])
 968				return 0;
 969		}
 970
 971		/* Well, it starts at 0 and we know it will collide so we may as
 972		 * well consider it as unassigned. That covers the Apple case.
 973		 */
 974		return 1;
 975	} else {
 976		/* If the BAR is non-0, then we consider it assigned */
 977		offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 978		if (((res->start - offset) & 0xfffffffful) != 0)
 979			return 0;
 980
 981		/* Here, we are a bit different than memory as typically IO space
 982		 * starting at low addresses -is- valid. What we do instead if that
 983		 * we consider as unassigned anything that doesn't have IO enabled
 984		 * in the PCI command register, and that's it.
 985		 */
 986		pci_read_config_word(dev, PCI_COMMAND, &command);
 987		if (command & PCI_COMMAND_IO)
 988			return 0;
 989
 990		/* It's starting at 0 and IO is disabled in the bridge, consider
 991		 * it unassigned
 992		 */
 993		return 1;
 994	}
 995}
 996
 997/* Fixup resources of a PCI<->PCI bridge */
 998static void pcibios_fixup_bridge(struct pci_bus *bus)
 999{
1000	struct resource *res;
1001	int i;
1002
1003	struct pci_dev *dev = bus->self;
1004
1005	pci_bus_for_each_resource(bus, res, i) {
1006		if (!res || !res->flags)
1007			continue;
1008		if (i >= 3 && bus->self->transparent)
1009			continue;
1010
1011		/* If we're going to reassign everything, we can
1012		 * shrink the P2P resource to have size as being
1013		 * of 0 in order to save space.
1014		 */
1015		if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
1016			res->flags |= IORESOURCE_UNSET;
1017			res->start = 0;
1018			res->end = -1;
1019			continue;
1020		}
1021
1022		pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res);
1023
1024		/* Try to detect uninitialized P2P bridge resources,
1025		 * and clear them out so they get re-assigned later
1026		 */
1027		if (pcibios_uninitialized_bridge_resource(bus, res)) {
1028			res->flags = 0;
1029			pr_debug("PCI:%s            (unassigned)\n", pci_name(dev));
1030		}
1031	}
1032}
1033
1034void pcibios_setup_bus_self(struct pci_bus *bus)
1035{
1036	struct pci_controller *phb;
1037
1038	/* Fix up the bus resources for P2P bridges */
1039	if (bus->self != NULL)
1040		pcibios_fixup_bridge(bus);
1041
1042	/* Platform specific bus fixups. This is currently only used
1043	 * by fsl_pci and I'm hoping to get rid of it at some point
1044	 */
1045	if (ppc_md.pcibios_fixup_bus)
1046		ppc_md.pcibios_fixup_bus(bus);
1047
1048	/* Setup bus DMA mappings */
1049	phb = pci_bus_to_host(bus);
1050	if (phb->controller_ops.dma_bus_setup)
1051		phb->controller_ops.dma_bus_setup(bus);
1052}
1053
1054void pcibios_bus_add_device(struct pci_dev *dev)
1055{
1056	struct pci_controller *phb;
1057	/* Fixup NUMA node as it may not be setup yet by the generic
1058	 * code and is needed by the DMA init
1059	 */
1060	set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
1061
1062	/* Hook up default DMA ops */
1063	set_dma_ops(&dev->dev, pci_dma_ops);
1064	dev->dev.archdata.dma_offset = PCI_DRAM_OFFSET;
1065
1066	/* Additional platform DMA/iommu setup */
1067	phb = pci_bus_to_host(dev->bus);
1068	if (phb->controller_ops.dma_dev_setup)
1069		phb->controller_ops.dma_dev_setup(dev);
1070
1071	/* Read default IRQs and fixup if necessary */
1072	pci_read_irq_line(dev);
1073	if (ppc_md.pci_irq_fixup)
1074		ppc_md.pci_irq_fixup(dev);
1075
1076	if (ppc_md.pcibios_bus_add_device)
1077		ppc_md.pcibios_bus_add_device(dev);
1078}
1079
1080int pcibios_device_add(struct pci_dev *dev)
1081{
1082	struct irq_domain *d;
 
 
 
 
 
1083
1084#ifdef CONFIG_PCI_IOV
1085	if (ppc_md.pcibios_fixup_sriov)
1086		ppc_md.pcibios_fixup_sriov(dev);
1087#endif /* CONFIG_PCI_IOV */
1088
1089	d = dev_get_msi_domain(&dev->bus->dev);
1090	if (d)
1091		dev_set_msi_domain(&dev->dev, d);
1092	return 0;
1093}
1094
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1095void pcibios_set_master(struct pci_dev *dev)
1096{
1097	/* No special bus mastering setup handling */
1098}
1099
1100void pcibios_fixup_bus(struct pci_bus *bus)
1101{
1102	/* When called from the generic PCI probe, read PCI<->PCI bridge
1103	 * bases. This is -not- called when generating the PCI tree from
1104	 * the OF device-tree.
1105	 */
1106	pci_read_bridge_bases(bus);
1107
1108	/* Now fixup the bus */
1109	pcibios_setup_bus_self(bus);
 
 
 
1110}
1111EXPORT_SYMBOL(pcibios_fixup_bus);
1112
 
 
 
 
 
 
 
1113static int skip_isa_ioresource_align(struct pci_dev *dev)
1114{
1115	if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) &&
1116	    !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
1117		return 1;
1118	return 0;
1119}
1120
1121/*
1122 * We need to avoid collisions with `mirrored' VGA ports
1123 * and other strange ISA hardware, so we always want the
1124 * addresses to be allocated in the 0x000-0x0ff region
1125 * modulo 0x400.
1126 *
1127 * Why? Because some silly external IO cards only decode
1128 * the low 10 bits of the IO address. The 0x00-0xff region
1129 * is reserved for motherboard devices that decode all 16
1130 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
1131 * but we want to try to avoid allocating at 0x2900-0x2bff
1132 * which might have be mirrored at 0x0100-0x03ff..
1133 */
1134resource_size_t pcibios_align_resource(void *data, const struct resource *res,
1135				resource_size_t size, resource_size_t align)
1136{
1137	struct pci_dev *dev = data;
1138	resource_size_t start = res->start;
1139
1140	if (res->flags & IORESOURCE_IO) {
1141		if (skip_isa_ioresource_align(dev))
1142			return start;
1143		if (start & 0x300)
1144			start = (start + 0x3ff) & ~0x3ff;
1145	}
1146
1147	return start;
1148}
1149EXPORT_SYMBOL(pcibios_align_resource);
1150
1151/*
1152 * Reparent resource children of pr that conflict with res
1153 * under res, and make res replace those children.
1154 */
1155static int reparent_resources(struct resource *parent,
1156				     struct resource *res)
1157{
1158	struct resource *p, **pp;
1159	struct resource **firstpp = NULL;
1160
1161	for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
1162		if (p->end < res->start)
1163			continue;
1164		if (res->end < p->start)
1165			break;
1166		if (p->start < res->start || p->end > res->end)
1167			return -1;	/* not completely contained */
1168		if (firstpp == NULL)
1169			firstpp = pp;
1170	}
1171	if (firstpp == NULL)
1172		return -1;	/* didn't find any conflicting entries? */
1173	res->parent = parent;
1174	res->child = *firstpp;
1175	res->sibling = *pp;
1176	*firstpp = res;
1177	*pp = NULL;
1178	for (p = res->child; p != NULL; p = p->sibling) {
1179		p->parent = res;
1180		pr_debug("PCI: Reparented %s %pR under %s\n",
1181			 p->name, p, res->name);
1182	}
1183	return 0;
1184}
1185
1186/*
1187 *  Handle resources of PCI devices.  If the world were perfect, we could
1188 *  just allocate all the resource regions and do nothing more.  It isn't.
1189 *  On the other hand, we cannot just re-allocate all devices, as it would
1190 *  require us to know lots of host bridge internals.  So we attempt to
1191 *  keep as much of the original configuration as possible, but tweak it
1192 *  when it's found to be wrong.
1193 *
1194 *  Known BIOS problems we have to work around:
1195 *	- I/O or memory regions not configured
1196 *	- regions configured, but not enabled in the command register
1197 *	- bogus I/O addresses above 64K used
1198 *	- expansion ROMs left enabled (this may sound harmless, but given
1199 *	  the fact the PCI specs explicitly allow address decoders to be
1200 *	  shared between expansion ROMs and other resource regions, it's
1201 *	  at least dangerous)
1202 *
1203 *  Our solution:
1204 *	(1) Allocate resources for all buses behind PCI-to-PCI bridges.
1205 *	    This gives us fixed barriers on where we can allocate.
1206 *	(2) Allocate resources for all enabled devices.  If there is
1207 *	    a collision, just mark the resource as unallocated. Also
1208 *	    disable expansion ROMs during this step.
1209 *	(3) Try to allocate resources for disabled devices.  If the
1210 *	    resources were assigned correctly, everything goes well,
1211 *	    if they weren't, they won't disturb allocation of other
1212 *	    resources.
1213 *	(4) Assign new addresses to resources which were either
1214 *	    not configured at all or misconfigured.  If explicitly
1215 *	    requested by the user, configure expansion ROM address
1216 *	    as well.
1217 */
1218
1219static void pcibios_allocate_bus_resources(struct pci_bus *bus)
1220{
1221	struct pci_bus *b;
1222	int i;
1223	struct resource *res, *pr;
1224
1225	pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
1226		 pci_domain_nr(bus), bus->number);
1227
1228	pci_bus_for_each_resource(bus, res, i) {
1229		if (!res || !res->flags || res->start > res->end || res->parent)
1230			continue;
1231
1232		/* If the resource was left unset at this point, we clear it */
1233		if (res->flags & IORESOURCE_UNSET)
1234			goto clear_resource;
1235
1236		if (bus->parent == NULL)
1237			pr = (res->flags & IORESOURCE_IO) ?
1238				&ioport_resource : &iomem_resource;
1239		else {
1240			pr = pci_find_parent_resource(bus->self, res);
1241			if (pr == res) {
1242				/* this happens when the generic PCI
1243				 * code (wrongly) decides that this
1244				 * bridge is transparent  -- paulus
1245				 */
1246				continue;
1247			}
1248		}
1249
1250		pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n",
1251			 bus->self ? pci_name(bus->self) : "PHB", bus->number,
1252			 i, res, pr, (pr && pr->name) ? pr->name : "nil");
1253
1254		if (pr && !(pr->flags & IORESOURCE_UNSET)) {
1255			struct pci_dev *dev = bus->self;
1256
1257			if (request_resource(pr, res) == 0)
1258				continue;
1259			/*
1260			 * Must be a conflict with an existing entry.
1261			 * Move that entry (or entries) under the
1262			 * bridge resource and try again.
1263			 */
1264			if (reparent_resources(pr, res) == 0)
1265				continue;
1266
1267			if (dev && i < PCI_BRIDGE_RESOURCE_NUM &&
1268			    pci_claim_bridge_resource(dev,
1269						i + PCI_BRIDGE_RESOURCES) == 0)
1270				continue;
1271		}
1272		pr_warn("PCI: Cannot allocate resource region %d of PCI bridge %d, will remap\n",
1273			i, bus->number);
1274	clear_resource:
1275		/* The resource might be figured out when doing
1276		 * reassignment based on the resources required
1277		 * by the downstream PCI devices. Here we set
1278		 * the size of the resource to be 0 in order to
1279		 * save more space.
1280		 */
1281		res->start = 0;
1282		res->end = -1;
1283		res->flags = 0;
1284	}
1285
1286	list_for_each_entry(b, &bus->children, node)
1287		pcibios_allocate_bus_resources(b);
1288}
1289
1290static inline void alloc_resource(struct pci_dev *dev, int idx)
1291{
1292	struct resource *pr, *r = &dev->resource[idx];
1293
1294	pr_debug("PCI: Allocating %s: Resource %d: %pR\n",
1295		 pci_name(dev), idx, r);
1296
1297	pr = pci_find_parent_resource(dev, r);
1298	if (!pr || (pr->flags & IORESOURCE_UNSET) ||
1299	    request_resource(pr, r) < 0) {
1300		printk(KERN_WARNING "PCI: Cannot allocate resource region %d"
1301		       " of device %s, will remap\n", idx, pci_name(dev));
1302		if (pr)
1303			pr_debug("PCI:  parent is %p: %pR\n", pr, pr);
1304		/* We'll assign a new address later */
1305		r->flags |= IORESOURCE_UNSET;
1306		r->end -= r->start;
1307		r->start = 0;
1308	}
1309}
1310
1311static void __init pcibios_allocate_resources(int pass)
1312{
1313	struct pci_dev *dev = NULL;
1314	int idx, disabled;
1315	u16 command;
1316	struct resource *r;
1317
1318	for_each_pci_dev(dev) {
1319		pci_read_config_word(dev, PCI_COMMAND, &command);
1320		for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
1321			r = &dev->resource[idx];
1322			if (r->parent)		/* Already allocated */
1323				continue;
1324			if (!r->flags || (r->flags & IORESOURCE_UNSET))
1325				continue;	/* Not assigned at all */
1326			/* We only allocate ROMs on pass 1 just in case they
1327			 * have been screwed up by firmware
1328			 */
1329			if (idx == PCI_ROM_RESOURCE )
1330				disabled = 1;
1331			if (r->flags & IORESOURCE_IO)
1332				disabled = !(command & PCI_COMMAND_IO);
1333			else
1334				disabled = !(command & PCI_COMMAND_MEMORY);
1335			if (pass == disabled)
1336				alloc_resource(dev, idx);
1337		}
1338		if (pass)
1339			continue;
1340		r = &dev->resource[PCI_ROM_RESOURCE];
1341		if (r->flags) {
1342			/* Turn the ROM off, leave the resource region,
1343			 * but keep it unregistered.
1344			 */
1345			u32 reg;
1346			pci_read_config_dword(dev, dev->rom_base_reg, &reg);
1347			if (reg & PCI_ROM_ADDRESS_ENABLE) {
1348				pr_debug("PCI: Switching off ROM of %s\n",
1349					 pci_name(dev));
1350				r->flags &= ~IORESOURCE_ROM_ENABLE;
1351				pci_write_config_dword(dev, dev->rom_base_reg,
1352						       reg & ~PCI_ROM_ADDRESS_ENABLE);
1353			}
1354		}
1355	}
1356}
1357
1358static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus)
1359{
1360	struct pci_controller *hose = pci_bus_to_host(bus);
1361	resource_size_t	offset;
1362	struct resource *res, *pres;
1363	int i;
1364
1365	pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus));
1366
1367	/* Check for IO */
1368	if (!(hose->io_resource.flags & IORESOURCE_IO))
1369		goto no_io;
1370	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
1371	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
1372	BUG_ON(res == NULL);
1373	res->name = "Legacy IO";
1374	res->flags = IORESOURCE_IO;
1375	res->start = offset;
1376	res->end = (offset + 0xfff) & 0xfffffffful;
1377	pr_debug("Candidate legacy IO: %pR\n", res);
1378	if (request_resource(&hose->io_resource, res)) {
1379		printk(KERN_DEBUG
1380		       "PCI %04x:%02x Cannot reserve Legacy IO %pR\n",
1381		       pci_domain_nr(bus), bus->number, res);
1382		kfree(res);
1383	}
1384
1385 no_io:
1386	/* Check for memory */
1387	for (i = 0; i < 3; i++) {
1388		pres = &hose->mem_resources[i];
1389		offset = hose->mem_offset[i];
1390		if (!(pres->flags & IORESOURCE_MEM))
1391			continue;
1392		pr_debug("hose mem res: %pR\n", pres);
1393		if ((pres->start - offset) <= 0xa0000 &&
1394		    (pres->end - offset) >= 0xbffff)
1395			break;
1396	}
1397	if (i >= 3)
1398		return;
1399	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
1400	BUG_ON(res == NULL);
1401	res->name = "Legacy VGA memory";
1402	res->flags = IORESOURCE_MEM;
1403	res->start = 0xa0000 + offset;
1404	res->end = 0xbffff + offset;
1405	pr_debug("Candidate VGA memory: %pR\n", res);
1406	if (request_resource(pres, res)) {
1407		printk(KERN_DEBUG
1408		       "PCI %04x:%02x Cannot reserve VGA memory %pR\n",
1409		       pci_domain_nr(bus), bus->number, res);
1410		kfree(res);
1411	}
1412}
1413
1414void __init pcibios_resource_survey(void)
1415{
1416	struct pci_bus *b;
1417
1418	/* Allocate and assign resources */
1419	list_for_each_entry(b, &pci_root_buses, node)
1420		pcibios_allocate_bus_resources(b);
1421	if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
1422		pcibios_allocate_resources(0);
1423		pcibios_allocate_resources(1);
1424	}
1425
1426	/* Before we start assigning unassigned resource, we try to reserve
1427	 * the low IO area and the VGA memory area if they intersect the
1428	 * bus available resources to avoid allocating things on top of them
1429	 */
1430	if (!pci_has_flag(PCI_PROBE_ONLY)) {
1431		list_for_each_entry(b, &pci_root_buses, node)
1432			pcibios_reserve_legacy_regions(b);
1433	}
1434
1435	/* Now, if the platform didn't decide to blindly trust the firmware,
1436	 * we proceed to assigning things that were left unassigned
1437	 */
1438	if (!pci_has_flag(PCI_PROBE_ONLY)) {
1439		pr_debug("PCI: Assigning unassigned resources...\n");
1440		pci_assign_unassigned_resources();
1441	}
 
 
 
 
1442}
1443
1444/* This is used by the PCI hotplug driver to allocate resource
1445 * of newly plugged busses. We can try to consolidate with the
1446 * rest of the code later, for now, keep it as-is as our main
1447 * resource allocation function doesn't deal with sub-trees yet.
1448 */
1449void pcibios_claim_one_bus(struct pci_bus *bus)
1450{
1451	struct pci_dev *dev;
1452	struct pci_bus *child_bus;
1453
1454	list_for_each_entry(dev, &bus->devices, bus_list) {
1455		struct resource *r;
1456		int i;
1457
1458		pci_dev_for_each_resource(dev, r, i) {
 
 
1459			if (r->parent || !r->start || !r->flags)
1460				continue;
1461
1462			pr_debug("PCI: Claiming %s: Resource %d: %pR\n",
1463				 pci_name(dev), i, r);
1464
1465			if (pci_claim_resource(dev, i) == 0)
1466				continue;
1467
1468			pci_claim_bridge_resource(dev, i);
1469		}
1470	}
1471
1472	list_for_each_entry(child_bus, &bus->children, node)
1473		pcibios_claim_one_bus(child_bus);
1474}
1475EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
1476
1477
1478/* pcibios_finish_adding_to_bus
1479 *
1480 * This is to be called by the hotplug code after devices have been
1481 * added to a bus, this include calling it for a PHB that is just
1482 * being added
1483 */
1484void pcibios_finish_adding_to_bus(struct pci_bus *bus)
1485{
1486	pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
1487		 pci_domain_nr(bus), bus->number);
1488
1489	/* Allocate bus and devices resources */
1490	pcibios_allocate_bus_resources(bus);
1491	pcibios_claim_one_bus(bus);
1492	if (!pci_has_flag(PCI_PROBE_ONLY)) {
1493		if (bus->self)
1494			pci_assign_unassigned_bridge_resources(bus->self);
1495		else
1496			pci_assign_unassigned_bus_resources(bus);
1497	}
1498
 
 
 
1499	/* Add new devices to global lists.  Register in proc, sysfs. */
1500	pci_bus_add_devices(bus);
 
 
 
1501}
1502EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
1503
1504int pcibios_enable_device(struct pci_dev *dev, int mask)
1505{
1506	struct pci_controller *phb = pci_bus_to_host(dev->bus);
1507
1508	if (phb->controller_ops.enable_device_hook)
1509		if (!phb->controller_ops.enable_device_hook(dev))
1510			return -EINVAL;
1511
1512	return pci_enable_resources(dev, mask);
1513}
1514
1515void pcibios_disable_device(struct pci_dev *dev)
1516{
1517	struct pci_controller *phb = pci_bus_to_host(dev->bus);
1518
1519	if (phb->controller_ops.disable_device)
1520		phb->controller_ops.disable_device(dev);
1521}
1522
1523resource_size_t pcibios_io_space_offset(struct pci_controller *hose)
1524{
1525	return (unsigned long) hose->io_base_virt - _IO_BASE;
1526}
1527
1528static void pcibios_setup_phb_resources(struct pci_controller *hose,
1529					struct list_head *resources)
1530{
1531	struct resource *res;
1532	resource_size_t offset;
1533	int i;
1534
1535	/* Hookup PHB IO resource */
1536	res = &hose->io_resource;
1537
1538	if (!res->flags) {
1539		pr_debug("PCI: I/O resource not set for host"
1540			 " bridge %pOF (domain %d)\n",
1541			 hose->dn, hose->global_number);
1542	} else {
1543		offset = pcibios_io_space_offset(hose);
1544
1545		pr_debug("PCI: PHB IO resource    = %pR off 0x%08llx\n",
1546			 res, (unsigned long long)offset);
1547		pci_add_resource_offset(resources, res, offset);
1548	}
1549
1550	/* Hookup PHB Memory resources */
1551	for (i = 0; i < 3; ++i) {
1552		res = &hose->mem_resources[i];
1553		if (!res->flags)
 
 
 
 
1554			continue;
1555
1556		offset = hose->mem_offset[i];
 
 
1557		pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i,
1558			 res, (unsigned long long)offset);
1559
1560		pci_add_resource_offset(resources, res, offset);
1561	}
1562}
1563
1564/*
1565 * Null PCI config access functions, for the case when we can't
1566 * find a hose.
1567 */
1568#define NULL_PCI_OP(rw, size, type)					\
1569static int								\
1570null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)	\
1571{									\
1572	return PCIBIOS_DEVICE_NOT_FOUND;    				\
1573}
1574
1575static int
1576null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
1577		 int len, u32 *val)
1578{
1579	return PCIBIOS_DEVICE_NOT_FOUND;
1580}
1581
1582static int
1583null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
1584		  int len, u32 val)
1585{
1586	return PCIBIOS_DEVICE_NOT_FOUND;
1587}
1588
1589static struct pci_ops null_pci_ops =
1590{
1591	.read = null_read_config,
1592	.write = null_write_config,
1593};
1594
1595/*
1596 * These functions are used early on before PCI scanning is done
1597 * and all of the pci_dev and pci_bus structures have been created.
1598 */
1599static struct pci_bus *
1600fake_pci_bus(struct pci_controller *hose, int busnr)
1601{
1602	static struct pci_bus bus;
1603
1604	if (hose == NULL) {
1605		printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
1606	}
1607	bus.number = busnr;
1608	bus.sysdata = hose;
1609	bus.ops = hose? hose->ops: &null_pci_ops;
1610	return &bus;
1611}
1612
1613#define EARLY_PCI_OP(rw, size, type)					\
1614int early_##rw##_config_##size(struct pci_controller *hose, int bus,	\
1615			       int devfn, int offset, type value)	\
1616{									\
1617	return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),	\
1618					    devfn, offset, value);	\
1619}
1620
1621EARLY_PCI_OP(read, byte, u8 *)
1622EARLY_PCI_OP(read, word, u16 *)
1623EARLY_PCI_OP(read, dword, u32 *)
1624EARLY_PCI_OP(write, byte, u8)
1625EARLY_PCI_OP(write, word, u16)
1626EARLY_PCI_OP(write, dword, u32)
1627
1628int early_find_capability(struct pci_controller *hose, int bus, int devfn,
1629			  int cap)
1630{
1631	return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
1632}
1633
1634struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
1635{
1636	struct pci_controller *hose = bus->sysdata;
1637
1638	return of_node_get(hose->dn);
1639}
1640
1641/**
1642 * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus
1643 * @hose: Pointer to the PCI host controller instance structure
1644 */
1645void pcibios_scan_phb(struct pci_controller *hose)
1646{
1647	LIST_HEAD(resources);
1648	struct pci_bus *bus;
1649	struct device_node *node = hose->dn;
1650	int mode;
1651
1652	pr_debug("PCI: Scanning PHB %pOF\n", node);
1653
1654	/* Get some IO space for the new PHB */
1655	pcibios_setup_phb_io_space(hose);
1656
1657	/* Wire up PHB bus resources */
1658	pcibios_setup_phb_resources(hose, &resources);
1659
1660	hose->busn.start = hose->first_busno;
1661	hose->busn.end	 = hose->last_busno;
1662	hose->busn.flags = IORESOURCE_BUS;
1663	pci_add_resource(&resources, &hose->busn);
1664
1665	/* Create an empty bus for the toplevel */
1666	bus = pci_create_root_bus(hose->parent, hose->first_busno,
1667				  hose->ops, hose, &resources);
1668	if (bus == NULL) {
1669		pr_err("Failed to create bus for PCI domain %04x\n",
1670			hose->global_number);
1671		pci_free_resource_list(&resources);
1672		return;
1673	}
1674	hose->bus = bus;
1675
1676	/* Get probe mode and perform scan */
1677	mode = PCI_PROBE_NORMAL;
1678	if (node && hose->controller_ops.probe_mode)
1679		mode = hose->controller_ops.probe_mode(bus);
1680	pr_debug("    probe mode: %d\n", mode);
1681	if (mode == PCI_PROBE_DEVTREE)
1682		of_scan_bus(node, bus);
1683
1684	if (mode == PCI_PROBE_NORMAL) {
1685		pci_bus_update_busn_res_end(bus, 255);
1686		hose->last_busno = pci_scan_child_bus(bus);
1687		pci_bus_update_busn_res_end(bus, hose->last_busno);
1688	}
1689
1690	/* Platform gets a chance to do some global fixups before
1691	 * we proceed to resource allocation
1692	 */
1693	if (ppc_md.pcibios_fixup_phb)
1694		ppc_md.pcibios_fixup_phb(hose);
1695
1696	/* Configure PCI Express settings */
1697	if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
1698		struct pci_bus *child;
1699		list_for_each_entry(child, &bus->children, node)
1700			pcie_bus_configure_settings(child);
1701	}
1702}
1703EXPORT_SYMBOL_GPL(pcibios_scan_phb);
1704
1705static void fixup_hide_host_resource_fsl(struct pci_dev *dev)
1706{
1707	int class = dev->class >> 8;
1708	/* When configured as agent, programming interface = 1 */
1709	int prog_if = dev->class & 0xf;
1710	struct resource *r;
1711
1712	if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
1713	     class == PCI_CLASS_BRIDGE_OTHER) &&
1714		(dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
1715		(prog_if == 0) &&
1716		(dev->bus->parent == NULL)) {
1717		pci_dev_for_each_resource(dev, r) {
1718			r->start = 0;
1719			r->end = 0;
1720			r->flags = 0;
1721		}
1722	}
1723}
1724DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
1725DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
1726
1727
1728static int __init discover_phbs(void)
1729{
1730	if (ppc_md.discover_phbs)
1731		ppc_md.discover_phbs();
 
 
 
1732
1733	return 0;
1734}
1735core_initcall(discover_phbs);