1/*
   2 * Contains common pci routines for ALL ppc platform
   3 * (based on pci_32.c and pci_64.c)
   4 *
   5 * Port for PPC64 David Engebretsen, IBM Corp.
   6 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
   7 *
   8 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   9 *   Rework, based on alpha PCI code.
  10 *
  11 * Common pmac/prep/chrp pci routines. -- Cort
  12 *
  13 * This program is free software; you can redistribute it and/or
  14 * modify it under the terms of the GNU General Public License
  15 * as published by the Free Software Foundation; either version
  16 * 2 of the License, or (at your option) any later version.
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/pci.h>
  21#include <linux/string.h>
  22#include <linux/init.h>
  23#include <linux/delay.h>
  24#include <linux/export.h>
  25#include <linux/of_address.h>
  26#include <linux/of_pci.h>
  27#include <linux/mm.h>
  28#include <linux/shmem_fs.h>
  29#include <linux/list.h>
  30#include <linux/syscalls.h>
  31#include <linux/irq.h>
  32#include <linux/vmalloc.h>
  33#include <linux/slab.h>
  34#include <linux/vgaarb.h>
  35
  36#include <asm/processor.h>
  37#include <asm/io.h>
  38#include <asm/prom.h>
  39#include <asm/pci-bridge.h>
  40#include <asm/byteorder.h>
  41#include <asm/machdep.h>
  42#include <asm/ppc-pci.h>
  43#include <asm/eeh.h>
  44
  45/* hose_spinlock protects accesses to the the phb_bitmap. */
  46static DEFINE_SPINLOCK(hose_spinlock);
  47LIST_HEAD(hose_list);
  48
  49/* For dynamic PHB numbering on get_phb_number(): max number of PHBs. */
  50#define MAX_PHBS 0x10000
  51
  52/*
  53 * For dynamic PHB numbering: used/free PHBs tracking bitmap.
  54 * Accesses to this bitmap should be protected by hose_spinlock.
  55 */
  56static DECLARE_BITMAP(phb_bitmap, MAX_PHBS);
  57
  58/* ISA Memory physical address */
  59resource_size_t isa_mem_base;
  60EXPORT_SYMBOL(isa_mem_base);
  61
  62
  63static const struct dma_map_ops *pci_dma_ops = &dma_nommu_ops;
  64
  65void set_pci_dma_ops(const struct dma_map_ops *dma_ops)
  66{
  67	pci_dma_ops = dma_ops;
  68}
  69
  70const struct dma_map_ops *get_pci_dma_ops(void)
  71{
  72	return pci_dma_ops;
  73}
  74EXPORT_SYMBOL(get_pci_dma_ops);
  75
  76/*
  77 * This function should run under locking protection, specifically
  78 * hose_spinlock.
  79 */
  80static int get_phb_number(struct device_node *dn)
  81{
  82	int ret, phb_id = -1;
  83	u32 prop_32;
  84	u64 prop;
  85
  86	/*
  87	 * Try fixed PHB numbering first, by checking archs and reading
  88	 * the respective device-tree properties. Firstly, try powernv by
  89	 * reading "ibm,opal-phbid", only present in OPAL environment.
  90	 */
  91	ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop);
  92	if (ret) {
  93		ret = of_property_read_u32_index(dn, "reg", 1, &prop_32);
  94		prop = prop_32;
  95	}
  96
  97	if (!ret)
  98		phb_id = (int)(prop & (MAX_PHBS - 1));
  99
 100	/* We need to be sure to not use the same PHB number twice. */
 101	if ((phb_id >= 0) && !test_and_set_bit(phb_id, phb_bitmap))
 102		return phb_id;
 103
 104	/*
 105	 * If not pseries nor powernv, or if fixed PHB numbering tried to add
 106	 * the same PHB number twice, then fallback to dynamic PHB numbering.
 107	 */
 108	phb_id = find_first_zero_bit(phb_bitmap, MAX_PHBS);
 109	BUG_ON(phb_id >= MAX_PHBS);
 110	set_bit(phb_id, phb_bitmap);
 111
 112	return phb_id;
 113}
 114
 115struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
 116{
 117	struct pci_controller *phb;
 118
 119	phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
 120	if (phb == NULL)
 121		return NULL;
 122	spin_lock(&hose_spinlock);
 123	phb->global_number = get_phb_number(dev);
 124	list_add_tail(&phb->list_node, &hose_list);
 125	spin_unlock(&hose_spinlock);
 126	phb->dn = dev;
 127	phb->is_dynamic = slab_is_available();
 128#ifdef CONFIG_PPC64
 129	if (dev) {
 130		int nid = of_node_to_nid(dev);
 131
 132		if (nid < 0 || !node_online(nid))
 133			nid = -1;
 134
 135		PHB_SET_NODE(phb, nid);
 136	}
 137#endif
 138	return phb;
 139}
 140EXPORT_SYMBOL_GPL(pcibios_alloc_controller);
 141
 142void pcibios_free_controller(struct pci_controller *phb)
 143{
 144	spin_lock(&hose_spinlock);
 145
 146	/* Clear bit of phb_bitmap to allow reuse of this PHB number. */
 147	if (phb->global_number < MAX_PHBS)
 148		clear_bit(phb->global_number, phb_bitmap);
 149
 150	list_del(&phb->list_node);
 151	spin_unlock(&hose_spinlock);
 152
 153	if (phb->is_dynamic)
 154		kfree(phb);
 155}
 156EXPORT_SYMBOL_GPL(pcibios_free_controller);
 157
 158/*
 159 * This function is used to call pcibios_free_controller()
 160 * in a deferred manner: a callback from the PCI subsystem.
 161 *
 162 * _*DO NOT*_ call pcibios_free_controller() explicitly if
 163 * this is used (or it may access an invalid *phb pointer).
 164 *
 165 * The callback occurs when all references to the root bus
 166 * are dropped (e.g., child buses/devices and their users).
 167 *
 168 * It's called as .release_fn() of 'struct pci_host_bridge'
 169 * which is associated with the 'struct pci_controller.bus'
 170 * (root bus) - it expects .release_data to hold a pointer
 171 * to 'struct pci_controller'.
 172 *
 173 * In order to use it, register .release_fn()/release_data
 174 * like this:
 175 *
 176 * pci_set_host_bridge_release(bridge,
 177 *                             pcibios_free_controller_deferred
 178 *                             (void *) phb);
 179 *
 180 * e.g. in the pcibios_root_bridge_prepare() callback from
 181 * pci_create_root_bus().
 182 */
 183void pcibios_free_controller_deferred(struct pci_host_bridge *bridge)
 184{
 185	struct pci_controller *phb = (struct pci_controller *)
 186					 bridge->release_data;
 187
 188	pr_debug("domain %d, dynamic %d\n", phb->global_number, phb->is_dynamic);
 189
 190	pcibios_free_controller(phb);
 191}
 192EXPORT_SYMBOL_GPL(pcibios_free_controller_deferred);
 193
 194/*
 195 * The function is used to return the minimal alignment
 196 * for memory or I/O windows of the associated P2P bridge.
 197 * By default, 4KiB alignment for I/O windows and 1MiB for
 198 * memory windows.
 199 */
 200resource_size_t pcibios_window_alignment(struct pci_bus *bus,
 201					 unsigned long type)
 202{
 203	struct pci_controller *phb = pci_bus_to_host(bus);
 204
 205	if (phb->controller_ops.window_alignment)
 206		return phb->controller_ops.window_alignment(bus, type);
 207
 208	/*
 209	 * PCI core will figure out the default
 210	 * alignment: 4KiB for I/O and 1MiB for
 211	 * memory window.
 212	 */
 213	return 1;
 214}
 215
 216void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
 217{
 218	struct pci_controller *hose = pci_bus_to_host(bus);
 219
 220	if (hose->controller_ops.setup_bridge)
 221		hose->controller_ops.setup_bridge(bus, type);
 222}
 223
 224void pcibios_reset_secondary_bus(struct pci_dev *dev)
 225{
 226	struct pci_controller *phb = pci_bus_to_host(dev->bus);
 227
 228	if (phb->controller_ops.reset_secondary_bus) {
 229		phb->controller_ops.reset_secondary_bus(dev);
 230		return;
 231	}
 232
 233	pci_reset_secondary_bus(dev);
 234}
 235
 236resource_size_t pcibios_default_alignment(void)
 237{
 238	if (ppc_md.pcibios_default_alignment)
 239		return ppc_md.pcibios_default_alignment();
 240
 241	return 0;
 242}
 243
 244#ifdef CONFIG_PCI_IOV
 245resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno)
 246{
 247	if (ppc_md.pcibios_iov_resource_alignment)
 248		return ppc_md.pcibios_iov_resource_alignment(pdev, resno);
 249
 250	return pci_iov_resource_size(pdev, resno);
 251}
 252
 253int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 254{
 255	if (ppc_md.pcibios_sriov_enable)
 256		return ppc_md.pcibios_sriov_enable(pdev, num_vfs);
 257
 258	return 0;
 259}
 260
 261int pcibios_sriov_disable(struct pci_dev *pdev)
 262{
 263	if (ppc_md.pcibios_sriov_disable)
 264		return ppc_md.pcibios_sriov_disable(pdev);
 265
 266	return 0;
 267}
 268
 269#endif /* CONFIG_PCI_IOV */
 270
 271void pcibios_bus_add_device(struct pci_dev *pdev)
 272{
 273	if (ppc_md.pcibios_bus_add_device)
 274		ppc_md.pcibios_bus_add_device(pdev);
 275}
 276
 277static resource_size_t pcibios_io_size(const struct pci_controller *hose)
 278{
 279#ifdef CONFIG_PPC64
 280	return hose->pci_io_size;
 281#else
 282	return resource_size(&hose->io_resource);
 283#endif
 284}
 285
 286int pcibios_vaddr_is_ioport(void __iomem *address)
 287{
 288	int ret = 0;
 289	struct pci_controller *hose;
 290	resource_size_t size;
 291
 292	spin_lock(&hose_spinlock);
 293	list_for_each_entry(hose, &hose_list, list_node) {
 294		size = pcibios_io_size(hose);
 295		if (address >= hose->io_base_virt &&
 296		    address < (hose->io_base_virt + size)) {
 297			ret = 1;
 298			break;
 299		}
 300	}
 301	spin_unlock(&hose_spinlock);
 302	return ret;
 303}
 304
 305unsigned long pci_address_to_pio(phys_addr_t address)
 306{
 307	struct pci_controller *hose;
 308	resource_size_t size;
 309	unsigned long ret = ~0;
 310
 311	spin_lock(&hose_spinlock);
 312	list_for_each_entry(hose, &hose_list, list_node) {
 313		size = pcibios_io_size(hose);
 314		if (address >= hose->io_base_phys &&
 315		    address < (hose->io_base_phys + size)) {
 316			unsigned long base =
 317				(unsigned long)hose->io_base_virt - _IO_BASE;
 318			ret = base + (address - hose->io_base_phys);
 319			break;
 320		}
 321	}
 322	spin_unlock(&hose_spinlock);
 323
 324	return ret;
 325}
 326EXPORT_SYMBOL_GPL(pci_address_to_pio);
 327
 328/*
 329 * Return the domain number for this bus.
 330 */
 331int pci_domain_nr(struct pci_bus *bus)
 332{
 333	struct pci_controller *hose = pci_bus_to_host(bus);
 334
 335	return hose->global_number;
 336}
 337EXPORT_SYMBOL(pci_domain_nr);
 338
 339/* This routine is meant to be used early during boot, when the
 340 * PCI bus numbers have not yet been assigned, and you need to
 341 * issue PCI config cycles to an OF device.
 342 * It could also be used to "fix" RTAS config cycles if you want
 343 * to set pci_assign_all_buses to 1 and still use RTAS for PCI
 344 * config cycles.
 345 */
 346struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
 347{
 348	while(node) {
 349		struct pci_controller *hose, *tmp;
 350		list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 351			if (hose->dn == node)
 352				return hose;
 353		node = node->parent;
 354	}
 355	return NULL;
 356}
 357
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 358/*
 359 * Reads the interrupt pin to determine if interrupt is use by card.
 360 * If the interrupt is used, then gets the interrupt line from the
 361 * openfirmware and sets it in the pci_dev and pci_config line.
 362 */
 363static int pci_read_irq_line(struct pci_dev *pci_dev)
 364{
 365	int virq;
 
 366
 367	pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
 368
 369#ifdef DEBUG
 370	memset(&oirq, 0xff, sizeof(oirq));
 371#endif
 372	/* Try to get a mapping from the device-tree */
 373	virq = of_irq_parse_and_map_pci(pci_dev, 0, 0);
 374	if (virq <= 0) {
 375		u8 line, pin;
 376
 377		/* If that fails, lets fallback to what is in the config
 378		 * space and map that through the default controller. We
 379		 * also set the type to level low since that's what PCI
 380		 * interrupts are. If your platform does differently, then
 381		 * either provide a proper interrupt tree or don't use this
 382		 * function.
 383		 */
 384		if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
 385			return -1;
 386		if (pin == 0)
 387			return -1;
 388		if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
 389		    line == 0xff || line == 0) {
 390			return -1;
 391		}
 392		pr_debug(" No map ! Using line %d (pin %d) from PCI config\n",
 393			 line, pin);
 394
 395		virq = irq_create_mapping(NULL, line);
 396		if (virq)
 397			irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
 398	}
 
 
 
 
 399
 400	if (!virq) {
 
 
 
 401		pr_debug(" Failed to map !\n");
 402		return -1;
 403	}
 404
 405	pr_debug(" Mapped to linux irq %d\n", virq);
 406
 407	pci_dev->irq = virq;
 408
 409	return 0;
 410}
 411
 412/*
 413 * Platform support for /proc/bus/pci/X/Y mmap()s.
 
 414 *  -- paulus.
 415 */
 416int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 417{
 418	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 419	resource_size_t ioaddr = pci_resource_start(pdev, bar);
 
 420
 421	if (!hose)
 422		return -EINVAL;
 423
 424	/* Convert to an offset within this PCI controller */
 425	ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE;
 
 
 
 
 
 
 
 
 
 426
 427	vma->vm_pgoff += (ioaddr + hose->io_base_phys) >> PAGE_SHIFT;
 428	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 429}
 430
 431/*
 432 * This one is used by /dev/mem and fbdev who have no clue about the
 433 * PCI device, it tries to find the PCI device first and calls the
 434 * above routine
 435 */
 436pgprot_t pci_phys_mem_access_prot(struct file *file,
 437				  unsigned long pfn,
 438				  unsigned long size,
 439				  pgprot_t prot)
 440{
 441	struct pci_dev *pdev = NULL;
 442	struct resource *found = NULL;
 443	resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT;
 444	int i;
 445
 446	if (page_is_ram(pfn))
 447		return prot;
 448
 449	prot = pgprot_noncached(prot);
 450	for_each_pci_dev(pdev) {
 451		for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 452			struct resource *rp = &pdev->resource[i];
 453			int flags = rp->flags;
 454
 455			/* Active and same type? */
 456			if ((flags & IORESOURCE_MEM) == 0)
 457				continue;
 458			/* In the range of this resource? */
 459			if (offset < (rp->start & PAGE_MASK) ||
 460			    offset > rp->end)
 461				continue;
 462			found = rp;
 463			break;
 464		}
 465		if (found)
 466			break;
 467	}
 468	if (found) {
 469		if (found->flags & IORESOURCE_PREFETCH)
 470			prot = pgprot_noncached_wc(prot);
 471		pci_dev_put(pdev);
 472	}
 473
 474	pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n",
 475		 (unsigned long long)offset, pgprot_val(prot));
 476
 477	return prot;
 478}
 479
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 480/* This provides legacy IO read access on a bus */
 481int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
 482{
 483	unsigned long offset;
 484	struct pci_controller *hose = pci_bus_to_host(bus);
 485	struct resource *rp = &hose->io_resource;
 486	void __iomem *addr;
 487
 488	/* Check if port can be supported by that bus. We only check
 489	 * the ranges of the PHB though, not the bus itself as the rules
 490	 * for forwarding legacy cycles down bridges are not our problem
 491	 * here. So if the host bridge supports it, we do it.
 492	 */
 493	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 494	offset += port;
 495
 496	if (!(rp->flags & IORESOURCE_IO))
 497		return -ENXIO;
 498	if (offset < rp->start || (offset + size) > rp->end)
 499		return -ENXIO;
 500	addr = hose->io_base_virt + port;
 501
 502	switch(size) {
 503	case 1:
 504		*((u8 *)val) = in_8(addr);
 505		return 1;
 506	case 2:
 507		if (port & 1)
 508			return -EINVAL;
 509		*((u16 *)val) = in_le16(addr);
 510		return 2;
 511	case 4:
 512		if (port & 3)
 513			return -EINVAL;
 514		*((u32 *)val) = in_le32(addr);
 515		return 4;
 516	}
 517	return -EINVAL;
 518}
 519
 520/* This provides legacy IO write access on a bus */
 521int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
 522{
 523	unsigned long offset;
 524	struct pci_controller *hose = pci_bus_to_host(bus);
 525	struct resource *rp = &hose->io_resource;
 526	void __iomem *addr;
 527
 528	/* Check if port can be supported by that bus. We only check
 529	 * the ranges of the PHB though, not the bus itself as the rules
 530	 * for forwarding legacy cycles down bridges are not our problem
 531	 * here. So if the host bridge supports it, we do it.
 532	 */
 533	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 534	offset += port;
 535
 536	if (!(rp->flags & IORESOURCE_IO))
 537		return -ENXIO;
 538	if (offset < rp->start || (offset + size) > rp->end)
 539		return -ENXIO;
 540	addr = hose->io_base_virt + port;
 541
 542	/* WARNING: The generic code is idiotic. It gets passed a pointer
 543	 * to what can be a 1, 2 or 4 byte quantity and always reads that
 544	 * as a u32, which means that we have to correct the location of
 545	 * the data read within those 32 bits for size 1 and 2
 546	 */
 547	switch(size) {
 548	case 1:
 549		out_8(addr, val >> 24);
 550		return 1;
 551	case 2:
 552		if (port & 1)
 553			return -EINVAL;
 554		out_le16(addr, val >> 16);
 555		return 2;
 556	case 4:
 557		if (port & 3)
 558			return -EINVAL;
 559		out_le32(addr, val);
 560		return 4;
 561	}
 562	return -EINVAL;
 563}
 564
 565/* This provides legacy IO or memory mmap access on a bus */
 566int pci_mmap_legacy_page_range(struct pci_bus *bus,
 567			       struct vm_area_struct *vma,
 568			       enum pci_mmap_state mmap_state)
 569{
 570	struct pci_controller *hose = pci_bus_to_host(bus);
 571	resource_size_t offset =
 572		((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
 573	resource_size_t size = vma->vm_end - vma->vm_start;
 574	struct resource *rp;
 575
 576	pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n",
 577		 pci_domain_nr(bus), bus->number,
 578		 mmap_state == pci_mmap_mem ? "MEM" : "IO",
 579		 (unsigned long long)offset,
 580		 (unsigned long long)(offset + size - 1));
 581
 582	if (mmap_state == pci_mmap_mem) {
 583		/* Hack alert !
 584		 *
 585		 * Because X is lame and can fail starting if it gets an error trying
 586		 * to mmap legacy_mem (instead of just moving on without legacy memory
 587		 * access) we fake it here by giving it anonymous memory, effectively
 588		 * behaving just like /dev/zero
 589		 */
 590		if ((offset + size) > hose->isa_mem_size) {
 591			printk(KERN_DEBUG
 592			       "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n",
 593			       current->comm, current->pid, pci_domain_nr(bus), bus->number);
 594			if (vma->vm_flags & VM_SHARED)
 595				return shmem_zero_setup(vma);
 596			return 0;
 597		}
 598		offset += hose->isa_mem_phys;
 599	} else {
 600		unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 601		unsigned long roffset = offset + io_offset;
 602		rp = &hose->io_resource;
 603		if (!(rp->flags & IORESOURCE_IO))
 604			return -ENXIO;
 605		if (roffset < rp->start || (roffset + size) > rp->end)
 606			return -ENXIO;
 607		offset += hose->io_base_phys;
 608	}
 609	pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
 610
 611	vma->vm_pgoff = offset >> PAGE_SHIFT;
 612	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 613	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 614			       vma->vm_end - vma->vm_start,
 615			       vma->vm_page_prot);
 616}
 617
 618void pci_resource_to_user(const struct pci_dev *dev, int bar,
 619			  const struct resource *rsrc,
 620			  resource_size_t *start, resource_size_t *end)
 621{
 622	struct pci_bus_region region;
 
 623
 624	if (rsrc->flags & IORESOURCE_IO) {
 625		pcibios_resource_to_bus(dev->bus, &region,
 626					(struct resource *) rsrc);
 627		*start = region.start;
 628		*end = region.end;
 629		return;
 630	}
 631
 632	/* We pass a CPU physical address to userland for MMIO instead of a
 633	 * BAR value because X is lame and expects to be able to use that
 634	 * to pass to /dev/mem!
 
 
 
 
 
 
 
 
 635	 *
 636	 * That means we may have 64-bit values where some apps only expect
 637	 * 32 (like X itself since it thinks only Sparc has 64-bit MMIO).
 
 
 
 
 
 638	 */
 639	*start = rsrc->start;
 640	*end = rsrc->end;
 
 
 
 
 
 641}
 642
 643/**
 644 * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
 645 * @hose: newly allocated pci_controller to be setup
 646 * @dev: device node of the host bridge
 647 * @primary: set if primary bus (32 bits only, soon to be deprecated)
 648 *
 649 * This function will parse the "ranges" property of a PCI host bridge device
 650 * node and setup the resource mapping of a pci controller based on its
 651 * content.
 652 *
 653 * Life would be boring if it wasn't for a few issues that we have to deal
 654 * with here:
 655 *
 656 *   - We can only cope with one IO space range and up to 3 Memory space
 657 *     ranges. However, some machines (thanks Apple !) tend to split their
 658 *     space into lots of small contiguous ranges. So we have to coalesce.
 659 *
 
 
 
 
 
 
 
 
 
 660 *   - Some busses have IO space not starting at 0, which causes trouble with
 661 *     the way we do our IO resource renumbering. The code somewhat deals with
 662 *     it for 64 bits but I would expect problems on 32 bits.
 663 *
 664 *   - Some 32 bits platforms such as 4xx can have physical space larger than
 665 *     32 bits so we need to use 64 bits values for the parsing
 666 */
 667void pci_process_bridge_OF_ranges(struct pci_controller *hose,
 668				  struct device_node *dev, int primary)
 669{
 670	int memno = 0;
 
 
 
 
 
 
 
 
 671	struct resource *res;
 672	struct of_pci_range range;
 673	struct of_pci_range_parser parser;
 674
 675	printk(KERN_INFO "PCI host bridge %pOF %s ranges:\n",
 676	       dev, primary ? "(primary)" : "");
 677
 678	/* Check for ranges property */
 679	if (of_pci_range_parser_init(&parser, dev))
 
 680		return;
 681
 682	/* Parse it */
 683	for_each_of_pci_range(&parser, &range) {
 
 
 
 
 
 
 
 684		/* If we failed translation or got a zero-sized region
 685		 * (some FW try to feed us with non sensical zero sized regions
 686		 * such as power3 which look like some kind of attempt at exposing
 687		 * the VGA memory hole)
 688		 */
 689		if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
 690			continue;
 691
 
 
 
 
 
 
 
 
 
 
 
 
 
 692		/* Act based on address space type */
 693		res = NULL;
 694		switch (range.flags & IORESOURCE_TYPE_BITS) {
 695		case IORESOURCE_IO:
 696			printk(KERN_INFO
 697			       "  IO 0x%016llx..0x%016llx -> 0x%016llx\n",
 698			       range.cpu_addr, range.cpu_addr + range.size - 1,
 699			       range.pci_addr);
 700
 701			/* We support only one IO range */
 702			if (hose->pci_io_size) {
 703				printk(KERN_INFO
 704				       " \\--> Skipped (too many) !\n");
 705				continue;
 706			}
 707#ifdef CONFIG_PPC32
 708			/* On 32 bits, limit I/O space to 16MB */
 709			if (range.size > 0x01000000)
 710				range.size = 0x01000000;
 711
 712			/* 32 bits needs to map IOs here */
 713			hose->io_base_virt = ioremap(range.cpu_addr,
 714						range.size);
 715
 716			/* Expect trouble if pci_addr is not 0 */
 717			if (primary)
 718				isa_io_base =
 719					(unsigned long)hose->io_base_virt;
 720#endif /* CONFIG_PPC32 */
 721			/* pci_io_size and io_base_phys always represent IO
 722			 * space starting at 0 so we factor in pci_addr
 723			 */
 724			hose->pci_io_size = range.pci_addr + range.size;
 725			hose->io_base_phys = range.cpu_addr - range.pci_addr;
 726
 727			/* Build resource */
 728			res = &hose->io_resource;
 729			range.cpu_addr = range.pci_addr;
 
 730			break;
 731		case IORESOURCE_MEM:
 
 732			printk(KERN_INFO
 733			       " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
 734			       range.cpu_addr, range.cpu_addr + range.size - 1,
 735			       range.pci_addr,
 736			       (range.pci_space & 0x40000000) ?
 737			       "Prefetch" : "");
 738
 739			/* We support only 3 memory ranges */
 740			if (memno >= 3) {
 741				printk(KERN_INFO
 742				       " \\--> Skipped (too many) !\n");
 743				continue;
 744			}
 745			/* Handles ISA memory hole space here */
 746			if (range.pci_addr == 0) {
 
 
 747				if (primary || isa_mem_base == 0)
 748					isa_mem_base = range.cpu_addr;
 749				hose->isa_mem_phys = range.cpu_addr;
 750				hose->isa_mem_size = range.size;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 751			}
 752
 753			/* Build resource */
 754			hose->mem_offset[memno] = range.cpu_addr -
 755							range.pci_addr;
 756			res = &hose->mem_resources[memno++];
 
 
 
 
 757			break;
 758		}
 759		if (res != NULL) {
 760			res->name = dev->full_name;
 761			res->flags = range.flags;
 762			res->start = range.cpu_addr;
 763			res->end = range.cpu_addr + range.size - 1;
 764			res->parent = res->child = res->sibling = NULL;
 765		}
 766	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 767}
 768
 769/* Decide whether to display the domain number in /proc */
 770int pci_proc_domain(struct pci_bus *bus)
 771{
 772	struct pci_controller *hose = pci_bus_to_host(bus);
 773
 774	if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS))
 775		return 0;
 776	if (pci_has_flag(PCI_COMPAT_DOMAIN_0))
 777		return hose->global_number != 0;
 778	return 1;
 779}
 780
 781int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 782{
 783	if (ppc_md.pcibios_root_bridge_prepare)
 784		return ppc_md.pcibios_root_bridge_prepare(bridge);
 785
 786	return 0;
 787}
 788
 789/* This header fixup will do the resource fixup for all devices as they are
 790 * probed, but not for bridge ranges
 791 */
 792static void pcibios_fixup_resources(struct pci_dev *dev)
 793{
 794	struct pci_controller *hose = pci_bus_to_host(dev->bus);
 795	int i;
 796
 797	if (!hose) {
 798		printk(KERN_ERR "No host bridge for PCI dev %s !\n",
 799		       pci_name(dev));
 800		return;
 801	}
 802
 803	if (dev->is_virtfn)
 804		return;
 805
 806	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 807		struct resource *res = dev->resource + i;
 808		struct pci_bus_region reg;
 809		if (!res->flags)
 810			continue;
 811
 812		/* If we're going to re-assign everything, we mark all resources
 813		 * as unset (and 0-base them). In addition, we mark BARs starting
 814		 * at 0 as unset as well, except if PCI_PROBE_ONLY is also set
 815		 * since in that case, we don't want to re-assign anything
 816		 */
 817		pcibios_resource_to_bus(dev->bus, &reg, res);
 818		if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) ||
 819		    (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) {
 820			/* Only print message if not re-assigning */
 821			if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC))
 822				pr_debug("PCI:%s Resource %d %pR is unassigned\n",
 823					 pci_name(dev), i, res);
 
 
 
 
 824			res->end -= res->start;
 825			res->start = 0;
 826			res->flags |= IORESOURCE_UNSET;
 827			continue;
 828		}
 829
 830		pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res);
 
 
 
 
 831	}
 832
 833	/* Call machine specific resource fixup */
 834	if (ppc_md.pcibios_fixup_resources)
 835		ppc_md.pcibios_fixup_resources(dev);
 836}
 837DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
 838
 839/* This function tries to figure out if a bridge resource has been initialized
 840 * by the firmware or not. It doesn't have to be absolutely bullet proof, but
 841 * things go more smoothly when it gets it right. It should covers cases such
 842 * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
 843 */
 844static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
 845						 struct resource *res)
 846{
 847	struct pci_controller *hose = pci_bus_to_host(bus);
 848	struct pci_dev *dev = bus->self;
 849	resource_size_t offset;
 850	struct pci_bus_region region;
 851	u16 command;
 852	int i;
 853
 854	/* We don't do anything if PCI_PROBE_ONLY is set */
 855	if (pci_has_flag(PCI_PROBE_ONLY))
 856		return 0;
 857
 858	/* Job is a bit different between memory and IO */
 859	if (res->flags & IORESOURCE_MEM) {
 860		pcibios_resource_to_bus(dev->bus, &region, res);
 861
 862		/* If the BAR is non-0 then it's probably been initialized */
 863		if (region.start != 0)
 864			return 0;
 865
 866		/* The BAR is 0, let's check if memory decoding is enabled on
 867		 * the bridge. If not, we consider it unassigned
 868		 */
 869		pci_read_config_word(dev, PCI_COMMAND, &command);
 870		if ((command & PCI_COMMAND_MEMORY) == 0)
 871			return 1;
 872
 873		/* Memory decoding is enabled and the BAR is 0. If any of the bridge
 874		 * resources covers that starting address (0 then it's good enough for
 875		 * us for memory space)
 876		 */
 877		for (i = 0; i < 3; i++) {
 878			if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
 879			    hose->mem_resources[i].start == hose->mem_offset[i])
 880				return 0;
 881		}
 882
 883		/* Well, it starts at 0 and we know it will collide so we may as
 884		 * well consider it as unassigned. That covers the Apple case.
 885		 */
 886		return 1;
 887	} else {
 888		/* If the BAR is non-0, then we consider it assigned */
 889		offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 890		if (((res->start - offset) & 0xfffffffful) != 0)
 891			return 0;
 892
 893		/* Here, we are a bit different than memory as typically IO space
 894		 * starting at low addresses -is- valid. What we do instead if that
 895		 * we consider as unassigned anything that doesn't have IO enabled
 896		 * in the PCI command register, and that's it.
 897		 */
 898		pci_read_config_word(dev, PCI_COMMAND, &command);
 899		if (command & PCI_COMMAND_IO)
 900			return 0;
 901
 902		/* It's starting at 0 and IO is disabled in the bridge, consider
 903		 * it unassigned
 904		 */
 905		return 1;
 906	}
 907}
 908
 909/* Fixup resources of a PCI<->PCI bridge */
 910static void pcibios_fixup_bridge(struct pci_bus *bus)
 911{
 912	struct resource *res;
 913	int i;
 914
 915	struct pci_dev *dev = bus->self;
 916
 917	pci_bus_for_each_resource(bus, res, i) {
 918		if (!res || !res->flags)
 919			continue;
 920		if (i >= 3 && bus->self->transparent)
 921			continue;
 922
 923		/* If we're going to reassign everything, we can
 924		 * shrink the P2P resource to have size as being
 925		 * of 0 in order to save space.
 926		 */
 927		if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
 928			res->flags |= IORESOURCE_UNSET;
 
 929			res->start = 0;
 930			res->end = -1;
 931			continue;
 932		}
 933
 934		pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res);
 
 
 
 
 935
 936		/* Try to detect uninitialized P2P bridge resources,
 937		 * and clear them out so they get re-assigned later
 938		 */
 939		if (pcibios_uninitialized_bridge_resource(bus, res)) {
 940			res->flags = 0;
 941			pr_debug("PCI:%s            (unassigned)\n", pci_name(dev));
 942		}
 943	}
 944}
 945
 946void pcibios_setup_bus_self(struct pci_bus *bus)
 947{
 948	struct pci_controller *phb;
 949
 950	/* Fix up the bus resources for P2P bridges */
 951	if (bus->self != NULL)
 952		pcibios_fixup_bridge(bus);
 953
 954	/* Platform specific bus fixups. This is currently only used
 955	 * by fsl_pci and I'm hoping to get rid of it at some point
 956	 */
 957	if (ppc_md.pcibios_fixup_bus)
 958		ppc_md.pcibios_fixup_bus(bus);
 959
 960	/* Setup bus DMA mappings */
 961	phb = pci_bus_to_host(bus);
 962	if (phb->controller_ops.dma_bus_setup)
 963		phb->controller_ops.dma_bus_setup(bus);
 964}
 965
 966static void pcibios_setup_device(struct pci_dev *dev)
 967{
 968	struct pci_controller *phb;
 969	/* Fixup NUMA node as it may not be setup yet by the generic
 970	 * code and is needed by the DMA init
 971	 */
 972	set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
 973
 974	/* Hook up default DMA ops */
 975	set_dma_ops(&dev->dev, pci_dma_ops);
 976	set_dma_offset(&dev->dev, PCI_DRAM_OFFSET);
 977
 978	/* Additional platform DMA/iommu setup */
 979	phb = pci_bus_to_host(dev->bus);
 980	if (phb->controller_ops.dma_dev_setup)
 981		phb->controller_ops.dma_dev_setup(dev);
 982
 983	/* Read default IRQs and fixup if necessary */
 984	pci_read_irq_line(dev);
 985	if (ppc_md.pci_irq_fixup)
 986		ppc_md.pci_irq_fixup(dev);
 987}
 988
 989int pcibios_add_device(struct pci_dev *dev)
 990{
 991	/*
 992	 * We can only call pcibios_setup_device() after bus setup is complete,
 993	 * since some of the platform specific DMA setup code depends on it.
 994	 */
 995	if (dev->bus->is_added)
 996		pcibios_setup_device(dev);
 997
 998#ifdef CONFIG_PCI_IOV
 999	if (ppc_md.pcibios_fixup_sriov)
1000		ppc_md.pcibios_fixup_sriov(dev);
1001#endif /* CONFIG_PCI_IOV */
1002
1003	return 0;
1004}
1005
1006void pcibios_setup_bus_devices(struct pci_bus *bus)
1007{
1008	struct pci_dev *dev;
1009
1010	pr_debug("PCI: Fixup bus devices %d (%s)\n",
1011		 bus->number, bus->self ? pci_name(bus->self) : "PHB");
1012
1013	list_for_each_entry(dev, &bus->devices, bus_list) {
1014		/* Cardbus can call us to add new devices to a bus, so ignore
1015		 * those who are already fully discovered
1016		 */
1017		if (dev->is_added)
1018			continue;
1019
1020		pcibios_setup_device(dev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1021	}
1022}
1023
1024void pcibios_set_master(struct pci_dev *dev)
1025{
1026	/* No special bus mastering setup handling */
1027}
1028
1029void pcibios_fixup_bus(struct pci_bus *bus)
1030{
1031	/* When called from the generic PCI probe, read PCI<->PCI bridge
1032	 * bases. This is -not- called when generating the PCI tree from
1033	 * the OF device-tree.
1034	 */
1035	pci_read_bridge_bases(bus);
 
1036
1037	/* Now fixup the bus bus */
1038	pcibios_setup_bus_self(bus);
1039
1040	/* Now fixup devices on that bus */
1041	pcibios_setup_bus_devices(bus);
1042}
1043EXPORT_SYMBOL(pcibios_fixup_bus);
1044
1045void pci_fixup_cardbus(struct pci_bus *bus)
1046{
1047	/* Now fixup devices on that bus */
1048	pcibios_setup_bus_devices(bus);
1049}
1050
1051
1052static int skip_isa_ioresource_align(struct pci_dev *dev)
1053{
1054	if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) &&
1055	    !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
1056		return 1;
1057	return 0;
1058}
1059
1060/*
1061 * We need to avoid collisions with `mirrored' VGA ports
1062 * and other strange ISA hardware, so we always want the
1063 * addresses to be allocated in the 0x000-0x0ff region
1064 * modulo 0x400.
1065 *
1066 * Why? Because some silly external IO cards only decode
1067 * the low 10 bits of the IO address. The 0x00-0xff region
1068 * is reserved for motherboard devices that decode all 16
1069 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
1070 * but we want to try to avoid allocating at 0x2900-0x2bff
1071 * which might have be mirrored at 0x0100-0x03ff..
1072 */
1073resource_size_t pcibios_align_resource(void *data, const struct resource *res,
1074				resource_size_t size, resource_size_t align)
1075{
1076	struct pci_dev *dev = data;
1077	resource_size_t start = res->start;
1078
1079	if (res->flags & IORESOURCE_IO) {
1080		if (skip_isa_ioresource_align(dev))
1081			return start;
1082		if (start & 0x300)
1083			start = (start + 0x3ff) & ~0x3ff;
1084	}
1085
1086	return start;
1087}
1088EXPORT_SYMBOL(pcibios_align_resource);
1089
1090/*
1091 * Reparent resource children of pr that conflict with res
1092 * under res, and make res replace those children.
1093 */
1094static int reparent_resources(struct resource *parent,
1095				     struct resource *res)
1096{
1097	struct resource *p, **pp;
1098	struct resource **firstpp = NULL;
1099
1100	for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
1101		if (p->end < res->start)
1102			continue;
1103		if (res->end < p->start)
1104			break;
1105		if (p->start < res->start || p->end > res->end)
1106			return -1;	/* not completely contained */
1107		if (firstpp == NULL)
1108			firstpp = pp;
1109	}
1110	if (firstpp == NULL)
1111		return -1;	/* didn't find any conflicting entries? */
1112	res->parent = parent;
1113	res->child = *firstpp;
1114	res->sibling = *pp;
1115	*firstpp = res;
1116	*pp = NULL;
1117	for (p = res->child; p != NULL; p = p->sibling) {
1118		p->parent = res;
1119		pr_debug("PCI: Reparented %s %pR under %s\n",
1120			 p->name, p, res->name);
 
 
1121	}
1122	return 0;
1123}
1124
1125/*
1126 *  Handle resources of PCI devices.  If the world were perfect, we could
1127 *  just allocate all the resource regions and do nothing more.  It isn't.
1128 *  On the other hand, we cannot just re-allocate all devices, as it would
1129 *  require us to know lots of host bridge internals.  So we attempt to
1130 *  keep as much of the original configuration as possible, but tweak it
1131 *  when it's found to be wrong.
1132 *
1133 *  Known BIOS problems we have to work around:
1134 *	- I/O or memory regions not configured
1135 *	- regions configured, but not enabled in the command register
1136 *	- bogus I/O addresses above 64K used
1137 *	- expansion ROMs left enabled (this may sound harmless, but given
1138 *	  the fact the PCI specs explicitly allow address decoders to be
1139 *	  shared between expansion ROMs and other resource regions, it's
1140 *	  at least dangerous)
1141 *
1142 *  Our solution:
1143 *	(1) Allocate resources for all buses behind PCI-to-PCI bridges.
1144 *	    This gives us fixed barriers on where we can allocate.
1145 *	(2) Allocate resources for all enabled devices.  If there is
1146 *	    a collision, just mark the resource as unallocated. Also
1147 *	    disable expansion ROMs during this step.
1148 *	(3) Try to allocate resources for disabled devices.  If the
1149 *	    resources were assigned correctly, everything goes well,
1150 *	    if they weren't, they won't disturb allocation of other
1151 *	    resources.
1152 *	(4) Assign new addresses to resources which were either
1153 *	    not configured at all or misconfigured.  If explicitly
1154 *	    requested by the user, configure expansion ROM address
1155 *	    as well.
1156 */
1157
1158static void pcibios_allocate_bus_resources(struct pci_bus *bus)
1159{
1160	struct pci_bus *b;
1161	int i;
1162	struct resource *res, *pr;
1163
1164	pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
1165		 pci_domain_nr(bus), bus->number);
1166
1167	pci_bus_for_each_resource(bus, res, i) {
1168		if (!res || !res->flags || res->start > res->end || res->parent)
1169			continue;
1170
1171		/* If the resource was left unset at this point, we clear it */
1172		if (res->flags & IORESOURCE_UNSET)
1173			goto clear_resource;
1174
1175		if (bus->parent == NULL)
1176			pr = (res->flags & IORESOURCE_IO) ?
1177				&ioport_resource : &iomem_resource;
1178		else {
1179			pr = pci_find_parent_resource(bus->self, res);
1180			if (pr == res) {
1181				/* this happens when the generic PCI
1182				 * code (wrongly) decides that this
1183				 * bridge is transparent  -- paulus
1184				 */
1185				continue;
1186			}
1187		}
1188
1189		pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n",
1190			 bus->self ? pci_name(bus->self) : "PHB", bus->number,
1191			 i, res, pr, (pr && pr->name) ? pr->name : "nil");
 
 
 
 
 
1192
1193		if (pr && !(pr->flags & IORESOURCE_UNSET)) {
1194			struct pci_dev *dev = bus->self;
1195
1196			if (request_resource(pr, res) == 0)
1197				continue;
1198			/*
1199			 * Must be a conflict with an existing entry.
1200			 * Move that entry (or entries) under the
1201			 * bridge resource and try again.
1202			 */
1203			if (reparent_resources(pr, res) == 0)
1204				continue;
1205
1206			if (dev && i < PCI_BRIDGE_RESOURCE_NUM &&
1207			    pci_claim_bridge_resource(dev,
1208						i + PCI_BRIDGE_RESOURCES) == 0)
1209				continue;
1210		}
1211		pr_warn("PCI: Cannot allocate resource region %d of PCI bridge %d, will remap\n",
1212			i, bus->number);
1213	clear_resource:
1214		/* The resource might be figured out when doing
1215		 * reassignment based on the resources required
1216		 * by the downstream PCI devices. Here we set
1217		 * the size of the resource to be 0 in order to
1218		 * save more space.
1219		 */
1220		res->start = 0;
1221		res->end = -1;
1222		res->flags = 0;
1223	}
1224
1225	list_for_each_entry(b, &bus->children, node)
1226		pcibios_allocate_bus_resources(b);
1227}
1228
1229static inline void alloc_resource(struct pci_dev *dev, int idx)
1230{
1231	struct resource *pr, *r = &dev->resource[idx];
1232
1233	pr_debug("PCI: Allocating %s: Resource %d: %pR\n",
1234		 pci_name(dev), idx, r);
 
 
 
1235
1236	pr = pci_find_parent_resource(dev, r);
1237	if (!pr || (pr->flags & IORESOURCE_UNSET) ||
1238	    request_resource(pr, r) < 0) {
1239		printk(KERN_WARNING "PCI: Cannot allocate resource region %d"
1240		       " of device %s, will remap\n", idx, pci_name(dev));
1241		if (pr)
1242			pr_debug("PCI:  parent is %p: %pR\n", pr, pr);
 
 
 
 
1243		/* We'll assign a new address later */
1244		r->flags |= IORESOURCE_UNSET;
1245		r->end -= r->start;
1246		r->start = 0;
1247	}
1248}
1249
1250static void __init pcibios_allocate_resources(int pass)
1251{
1252	struct pci_dev *dev = NULL;
1253	int idx, disabled;
1254	u16 command;
1255	struct resource *r;
1256
1257	for_each_pci_dev(dev) {
1258		pci_read_config_word(dev, PCI_COMMAND, &command);
1259		for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
1260			r = &dev->resource[idx];
1261			if (r->parent)		/* Already allocated */
1262				continue;
1263			if (!r->flags || (r->flags & IORESOURCE_UNSET))
1264				continue;	/* Not assigned at all */
1265			/* We only allocate ROMs on pass 1 just in case they
1266			 * have been screwed up by firmware
1267			 */
1268			if (idx == PCI_ROM_RESOURCE )
1269				disabled = 1;
1270			if (r->flags & IORESOURCE_IO)
1271				disabled = !(command & PCI_COMMAND_IO);
1272			else
1273				disabled = !(command & PCI_COMMAND_MEMORY);
1274			if (pass == disabled)
1275				alloc_resource(dev, idx);
1276		}
1277		if (pass)
1278			continue;
1279		r = &dev->resource[PCI_ROM_RESOURCE];
1280		if (r->flags) {
1281			/* Turn the ROM off, leave the resource region,
1282			 * but keep it unregistered.
1283			 */
1284			u32 reg;
1285			pci_read_config_dword(dev, dev->rom_base_reg, &reg);
1286			if (reg & PCI_ROM_ADDRESS_ENABLE) {
1287				pr_debug("PCI: Switching off ROM of %s\n",
1288					 pci_name(dev));
1289				r->flags &= ~IORESOURCE_ROM_ENABLE;
1290				pci_write_config_dword(dev, dev->rom_base_reg,
1291						       reg & ~PCI_ROM_ADDRESS_ENABLE);
1292			}
1293		}
1294	}
1295}
1296
1297static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus)
1298{
1299	struct pci_controller *hose = pci_bus_to_host(bus);
1300	resource_size_t	offset;
1301	struct resource *res, *pres;
1302	int i;
1303
1304	pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus));
1305
1306	/* Check for IO */
1307	if (!(hose->io_resource.flags & IORESOURCE_IO))
1308		goto no_io;
1309	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
1310	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
1311	BUG_ON(res == NULL);
1312	res->name = "Legacy IO";
1313	res->flags = IORESOURCE_IO;
1314	res->start = offset;
1315	res->end = (offset + 0xfff) & 0xfffffffful;
1316	pr_debug("Candidate legacy IO: %pR\n", res);
1317	if (request_resource(&hose->io_resource, res)) {
1318		printk(KERN_DEBUG
1319		       "PCI %04x:%02x Cannot reserve Legacy IO %pR\n",
1320		       pci_domain_nr(bus), bus->number, res);
1321		kfree(res);
1322	}
1323
1324 no_io:
1325	/* Check for memory */
 
 
1326	for (i = 0; i < 3; i++) {
1327		pres = &hose->mem_resources[i];
1328		offset = hose->mem_offset[i];
1329		if (!(pres->flags & IORESOURCE_MEM))
1330			continue;
1331		pr_debug("hose mem res: %pR\n", pres);
1332		if ((pres->start - offset) <= 0xa0000 &&
1333		    (pres->end - offset) >= 0xbffff)
1334			break;
1335	}
1336	if (i >= 3)
1337		return;
1338	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
1339	BUG_ON(res == NULL);
1340	res->name = "Legacy VGA memory";
1341	res->flags = IORESOURCE_MEM;
1342	res->start = 0xa0000 + offset;
1343	res->end = 0xbffff + offset;
1344	pr_debug("Candidate VGA memory: %pR\n", res);
1345	if (request_resource(pres, res)) {
1346		printk(KERN_DEBUG
1347		       "PCI %04x:%02x Cannot reserve VGA memory %pR\n",
1348		       pci_domain_nr(bus), bus->number, res);
1349		kfree(res);
1350	}
1351}
1352
1353void __init pcibios_resource_survey(void)
1354{
1355	struct pci_bus *b;
1356
1357	/* Allocate and assign resources */
1358	list_for_each_entry(b, &pci_root_buses, node)
1359		pcibios_allocate_bus_resources(b);
1360	if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
1361		pcibios_allocate_resources(0);
1362		pcibios_allocate_resources(1);
1363	}
1364
1365	/* Before we start assigning unassigned resource, we try to reserve
1366	 * the low IO area and the VGA memory area if they intersect the
1367	 * bus available resources to avoid allocating things on top of them
1368	 */
1369	if (!pci_has_flag(PCI_PROBE_ONLY)) {
1370		list_for_each_entry(b, &pci_root_buses, node)
1371			pcibios_reserve_legacy_regions(b);
1372	}
1373
1374	/* Now, if the platform didn't decide to blindly trust the firmware,
1375	 * we proceed to assigning things that were left unassigned
1376	 */
1377	if (!pci_has_flag(PCI_PROBE_ONLY)) {
1378		pr_debug("PCI: Assigning unassigned resources...\n");
1379		pci_assign_unassigned_resources();
1380	}
1381
1382	/* Call machine dependent fixup */
1383	if (ppc_md.pcibios_fixup)
1384		ppc_md.pcibios_fixup();
1385}
1386
 
 
1387/* This is used by the PCI hotplug driver to allocate resource
1388 * of newly plugged busses. We can try to consolidate with the
1389 * rest of the code later, for now, keep it as-is as our main
1390 * resource allocation function doesn't deal with sub-trees yet.
1391 */
1392void pcibios_claim_one_bus(struct pci_bus *bus)
1393{
1394	struct pci_dev *dev;
1395	struct pci_bus *child_bus;
1396
1397	list_for_each_entry(dev, &bus->devices, bus_list) {
1398		int i;
1399
1400		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1401			struct resource *r = &dev->resource[i];
1402
1403			if (r->parent || !r->start || !r->flags)
1404				continue;
1405
1406			pr_debug("PCI: Claiming %s: Resource %d: %pR\n",
1407				 pci_name(dev), i, r);
 
 
 
 
1408
1409			if (pci_claim_resource(dev, i) == 0)
1410				continue;
1411
1412			pci_claim_bridge_resource(dev, i);
1413		}
1414	}
1415
1416	list_for_each_entry(child_bus, &bus->children, node)
1417		pcibios_claim_one_bus(child_bus);
1418}
1419EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
1420
1421
1422/* pcibios_finish_adding_to_bus
1423 *
1424 * This is to be called by the hotplug code after devices have been
1425 * added to a bus, this include calling it for a PHB that is just
1426 * being added
1427 */
1428void pcibios_finish_adding_to_bus(struct pci_bus *bus)
1429{
1430	pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
1431		 pci_domain_nr(bus), bus->number);
1432
1433	/* Allocate bus and devices resources */
1434	pcibios_allocate_bus_resources(bus);
1435	pcibios_claim_one_bus(bus);
1436	if (!pci_has_flag(PCI_PROBE_ONLY)) {
1437		if (bus->self)
1438			pci_assign_unassigned_bridge_resources(bus->self);
1439		else
1440			pci_assign_unassigned_bus_resources(bus);
1441	}
1442
1443	/* Fixup EEH */
1444	eeh_add_device_tree_late(bus);
1445
1446	/* Add new devices to global lists.  Register in proc, sysfs. */
1447	pci_bus_add_devices(bus);
1448
1449	/* sysfs files should only be added after devices are added */
1450	eeh_add_sysfs_files(bus);
1451}
1452EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
1453
 
 
1454int pcibios_enable_device(struct pci_dev *dev, int mask)
1455{
1456	struct pci_controller *phb = pci_bus_to_host(dev->bus);
1457
1458	if (phb->controller_ops.enable_device_hook)
1459		if (!phb->controller_ops.enable_device_hook(dev))
1460			return -EINVAL;
1461
1462	return pci_enable_resources(dev, mask);
1463}
1464
1465void pcibios_disable_device(struct pci_dev *dev)
1466{
1467	struct pci_controller *phb = pci_bus_to_host(dev->bus);
1468
1469	if (phb->controller_ops.disable_device)
1470		phb->controller_ops.disable_device(dev);
1471}
1472
1473resource_size_t pcibios_io_space_offset(struct pci_controller *hose)
1474{
1475	return (unsigned long) hose->io_base_virt - _IO_BASE;
1476}
1477
1478static void pcibios_setup_phb_resources(struct pci_controller *hose,
1479					struct list_head *resources)
1480{
1481	struct resource *res;
1482	resource_size_t offset;
1483	int i;
1484
1485	/* Hookup PHB IO resource */
1486	res = &hose->io_resource;
1487
1488	if (!res->flags) {
1489		pr_debug("PCI: I/O resource not set for host"
1490			 " bridge %pOF (domain %d)\n",
1491			 hose->dn, hose->global_number);
1492	} else {
1493		offset = pcibios_io_space_offset(hose);
1494
1495		pr_debug("PCI: PHB IO resource    = %pR off 0x%08llx\n",
1496			 res, (unsigned long long)offset);
1497		pci_add_resource_offset(resources, res, offset);
1498	}
1499
 
 
 
 
 
 
1500	/* Hookup PHB Memory resources */
1501	for (i = 0; i < 3; ++i) {
1502		res = &hose->mem_resources[i];
1503		if (!res->flags)
1504			continue;
1505
1506		offset = hose->mem_offset[i];
1507		pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i,
1508			 res, (unsigned long long)offset);
 
 
 
 
 
 
 
1509
1510		pci_add_resource_offset(resources, res, offset);
 
 
 
 
1511	}
 
 
 
 
 
 
1512}
1513
1514/*
1515 * Null PCI config access functions, for the case when we can't
1516 * find a hose.
1517 */
1518#define NULL_PCI_OP(rw, size, type)					\
1519static int								\
1520null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)	\
1521{									\
1522	return PCIBIOS_DEVICE_NOT_FOUND;    				\
1523}
1524
1525static int
1526null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
1527		 int len, u32 *val)
1528{
1529	return PCIBIOS_DEVICE_NOT_FOUND;
1530}
1531
1532static int
1533null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
1534		  int len, u32 val)
1535{
1536	return PCIBIOS_DEVICE_NOT_FOUND;
1537}
1538
1539static struct pci_ops null_pci_ops =
1540{
1541	.read = null_read_config,
1542	.write = null_write_config,
1543};
1544
1545/*
1546 * These functions are used early on before PCI scanning is done
1547 * and all of the pci_dev and pci_bus structures have been created.
1548 */
1549static struct pci_bus *
1550fake_pci_bus(struct pci_controller *hose, int busnr)
1551{
1552	static struct pci_bus bus;
1553
1554	if (hose == NULL) {
1555		printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
1556	}
1557	bus.number = busnr;
1558	bus.sysdata = hose;
1559	bus.ops = hose? hose->ops: &null_pci_ops;
1560	return &bus;
1561}
1562
1563#define EARLY_PCI_OP(rw, size, type)					\
1564int early_##rw##_config_##size(struct pci_controller *hose, int bus,	\
1565			       int devfn, int offset, type value)	\
1566{									\
1567	return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),	\
1568					    devfn, offset, value);	\
1569}
1570
1571EARLY_PCI_OP(read, byte, u8 *)
1572EARLY_PCI_OP(read, word, u16 *)
1573EARLY_PCI_OP(read, dword, u32 *)
1574EARLY_PCI_OP(write, byte, u8)
1575EARLY_PCI_OP(write, word, u16)
1576EARLY_PCI_OP(write, dword, u32)
1577
 
1578int early_find_capability(struct pci_controller *hose, int bus, int devfn,
1579			  int cap)
1580{
1581	return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
1582}
1583
1584struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
1585{
1586	struct pci_controller *hose = bus->sysdata;
1587
1588	return of_node_get(hose->dn);
1589}
1590
1591/**
1592 * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus
1593 * @hose: Pointer to the PCI host controller instance structure
1594 */
1595void pcibios_scan_phb(struct pci_controller *hose)
1596{
1597	LIST_HEAD(resources);
1598	struct pci_bus *bus;
1599	struct device_node *node = hose->dn;
1600	int mode;
1601
1602	pr_debug("PCI: Scanning PHB %pOF\n", node);
 
1603
1604	/* Get some IO space for the new PHB */
1605	pcibios_setup_phb_io_space(hose);
1606
1607	/* Wire up PHB bus resources */
1608	pcibios_setup_phb_resources(hose, &resources);
1609
1610	hose->busn.start = hose->first_busno;
1611	hose->busn.end	 = hose->last_busno;
1612	hose->busn.flags = IORESOURCE_BUS;
1613	pci_add_resource(&resources, &hose->busn);
1614
1615	/* Create an empty bus for the toplevel */
1616	bus = pci_create_root_bus(hose->parent, hose->first_busno,
1617				  hose->ops, hose, &resources);
1618	if (bus == NULL) {
1619		pr_err("Failed to create bus for PCI domain %04x\n",
1620			hose->global_number);
1621		pci_free_resource_list(&resources);
1622		return;
1623	}
 
1624	hose->bus = bus;
1625
1626	/* Get probe mode and perform scan */
1627	mode = PCI_PROBE_NORMAL;
1628	if (node && hose->controller_ops.probe_mode)
1629		mode = hose->controller_ops.probe_mode(bus);
1630	pr_debug("    probe mode: %d\n", mode);
1631	if (mode == PCI_PROBE_DEVTREE)
 
1632		of_scan_bus(node, bus);
1633
1634	if (mode == PCI_PROBE_NORMAL) {
1635		pci_bus_update_busn_res_end(bus, 255);
1636		hose->last_busno = pci_scan_child_bus(bus);
1637		pci_bus_update_busn_res_end(bus, hose->last_busno);
1638	}
1639
 
 
 
1640	/* Platform gets a chance to do some global fixups before
1641	 * we proceed to resource allocation
1642	 */
1643	if (ppc_md.pcibios_fixup_phb)
1644		ppc_md.pcibios_fixup_phb(hose);
1645
1646	/* Configure PCI Express settings */
1647	if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
1648		struct pci_bus *child;
1649		list_for_each_entry(child, &bus->children, node)
1650			pcie_bus_configure_settings(child);
 
 
 
 
1651	}
1652}
1653EXPORT_SYMBOL_GPL(pcibios_scan_phb);
1654
1655static void fixup_hide_host_resource_fsl(struct pci_dev *dev)
1656{
1657	int i, class = dev->class >> 8;
1658	/* When configured as agent, programing interface = 1 */
1659	int prog_if = dev->class & 0xf;
1660
1661	if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
1662	     class == PCI_CLASS_BRIDGE_OTHER) &&
1663		(dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
1664		(prog_if == 0) &&
1665		(dev->bus->parent == NULL)) {
1666		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1667			dev->resource[i].start = 0;
1668			dev->resource[i].end = 0;
1669			dev->resource[i].flags = 0;
1670		}
1671	}
1672}
1673DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
1674DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);