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