arch/powerpc/kernel/pci_64.c - linux - Git at Google

 /*
  * Port for PPC64 David Engebretsen, IBM Corp.
  * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
  *
  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
  *   Rework, based on alpha PCI code.
  *
  *      This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
  *      as published by the Free Software Foundation; either version
  *      2 of the License, or (at your option) any later version.
  */

 #undef DEBUG

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/mm.h>
 #include <linux/list.h>
 #include <linux/syscalls.h>
 #include <linux/irq.h>
 #include <linux/vmalloc.h>

 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 #include <asm/byteorder.h>
 #include <asm/machdep.h>
 #include <asm/ppc-pci.h>

 unsigned long pci_probe_only = 1;

 /* pci_io_base -- the base address from which io bars are offsets.
  * This is the lowest I/O base address (so bar values are always positive),
  * and it *must* be the start of ISA space if an ISA bus exists because
  * ISA drivers use hard coded offsets.  If no ISA bus exists nothing
  * is mapped on the first 64K of IO space
  */
 unsigned long pci_io_base = ISA_IO_BASE;
 EXPORT_SYMBOL(pci_io_base);

 static int __init pcibios_init(void)
 {
 	struct pci_controller *hose, *tmp;

 	printk(KERN_INFO "PCI: Probing PCI hardware\n");

 	/* For now, override phys_mem_access_prot. If we need it,g
 	 * later, we may move that initialization to each ppc_md
 	 */
 	ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;

 	if (pci_probe_only)
 		pci_add_flags(PCI_PROBE_ONLY);

 	/* On ppc64, we always enable PCI domains and we keep domain 0
 	 * backward compatible in /proc for video cards
 	 */
 	pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);

 	/* Scan all of the recorded PCI controllers.  */
 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 		pcibios_scan_phb(hose);
 		pci_bus_add_devices(hose->bus);
 	}

 	/* Call common code to handle resource allocation */
 	pcibios_resource_survey();

 	printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");

 	return 0;
 }

 subsys_initcall(pcibios_init);

 #ifdef CONFIG_HOTPLUG

 int pcibios_unmap_io_space(struct pci_bus *bus)
 {
 	struct pci_controller *hose;

 	WARN_ON(bus == NULL);

 	/* If this is not a PHB, we only flush the hash table over
 	 * the area mapped by this bridge. We don't play with the PTE
 	 * mappings since we might have to deal with sub-page alignemnts
 	 * so flushing the hash table is the only sane way to make sure
 	 * that no hash entries are covering that removed bridge area
 	 * while still allowing other busses overlapping those pages
 	 *
 	 * Note: If we ever support P2P hotplug on Book3E, we'll have
 	 * to do an appropriate TLB flush here too
 	 */
 	if (bus->self) {
 #ifdef CONFIG_PPC_STD_MMU_64
 		struct resource *res = bus->resource[0];
 #endif

 		pr_debug("IO unmapping for PCI-PCI bridge %s\n",
 			 pci_name(bus->self));

 #ifdef CONFIG_PPC_STD_MMU_64
 		__flush_hash_table_range(&init_mm, res->start + _IO_BASE,
 					 res->end + _IO_BASE + 1);
 #endif
 		return 0;
 	}

 	/* Get the host bridge */
 	hose = pci_bus_to_host(bus);

 	/* Check if we have IOs allocated */
 	if (hose->io_base_alloc == 0)
 		return 0;

 	pr_debug("IO unmapping for PHB %s\n", hose->dn->full_name);
 	pr_debug("  alloc=0x%p\n", hose->io_base_alloc);

 	/* This is a PHB, we fully unmap the IO area */
 	vunmap(hose->io_base_alloc);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);

 #endif /* CONFIG_HOTPLUG */

 int __devinit pcibios_map_io_space(struct pci_bus *bus)
 {
 	struct vm_struct *area;
 	unsigned long phys_page;
 	unsigned long size_page;
 	unsigned long io_virt_offset;
 	struct pci_controller *hose;

 	WARN_ON(bus == NULL);

 	/* If this not a PHB, nothing to do, page tables still exist and
 	 * thus HPTEs will be faulted in when needed
 	 */
 	if (bus->self) {
 		pr_debug("IO mapping for PCI-PCI bridge %s\n",
 			 pci_name(bus->self));
 		pr_debug("  virt=0x%016llx...0x%016llx\n",
 			 bus->resource[0]->start + _IO_BASE,
 			 bus->resource[0]->end + _IO_BASE);
 		return 0;
 	}

 	/* Get the host bridge */
 	hose = pci_bus_to_host(bus);
 	phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
 	size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);

 	/* Make sure IO area address is clear */
 	hose->io_base_alloc = NULL;

 	/* If there's no IO to map on that bus, get away too */
 	if (hose->pci_io_size == 0 || hose->io_base_phys == 0)
 		return 0;

 	/* Let's allocate some IO space for that guy. We don't pass
 	 * VM_IOREMAP because we don't care about alignment tricks that
 	 * the core does in that case. Maybe we should due to stupid card
 	 * with incomplete address decoding but I'd rather not deal with
 	 * those outside of the reserved 64K legacy region.
 	 */
 	area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
 	if (area == NULL)
 		return -ENOMEM;
 	hose->io_base_alloc = area->addr;
 	hose->io_base_virt = (void __iomem *)(area->addr +
 					      hose->io_base_phys - phys_page);

 	pr_debug("IO mapping for PHB %s\n", hose->dn->full_name);
 	pr_debug("  phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
 		 hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
 	pr_debug("  size=0x%016llx (alloc=0x%016lx)\n",
 		 hose->pci_io_size, size_page);

 	/* Establish the mapping */
 	if (__ioremap_at(phys_page, area->addr, size_page,
 			 _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)
 		return -ENOMEM;

 	/* Fixup hose IO resource */
 	io_virt_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
 	hose->io_resource.start += io_virt_offset;
 	hose->io_resource.end += io_virt_offset;

 	pr_debug("  hose->io_resource=%pR\n", &hose->io_resource);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(pcibios_map_io_space);

 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
 {
 	pcibios_map_io_space(hose->bus);
 }

 #define IOBASE_BRIDGE_NUMBER	0
 #define IOBASE_MEMORY		1
 #define IOBASE_IO		2
 #define IOBASE_ISA_IO		3
 #define IOBASE_ISA_MEM		4

 long sys_pciconfig_iobase(long which, unsigned long in_bus,
 			  unsigned long in_devfn)
 {
 	struct pci_controller* hose;
 	struct list_head *ln;
 	struct pci_bus *bus = NULL;
 	struct device_node *hose_node;

 	/* Argh ! Please forgive me for that hack, but that's the
 	 * simplest way to get existing XFree to not lockup on some
 	 * G5 machines... So when something asks for bus 0 io base
 	 * (bus 0 is HT root), we return the AGP one instead.
 	 */
 	if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) {
 		struct device_node *agp;

 		agp = of_find_compatible_node(NULL, NULL, "u3-agp");
 		if (agp)
 			in_bus = 0xf0;
 		of_node_put(agp);
 	}

 	/* That syscall isn't quite compatible with PCI domains, but it's
 	 * used on pre-domains setup. We return the first match
 	 */

 	for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
 		bus = pci_bus_b(ln);
 		if (in_bus >= bus->number && in_bus <= bus->subordinate)
 			break;
 		bus = NULL;
 	}
 	if (bus == NULL || bus->dev.of_node == NULL)
 		return -ENODEV;

 	hose_node = bus->dev.of_node;
 	hose = PCI_DN(hose_node)->phb;

 	switch (which) {
 	case IOBASE_BRIDGE_NUMBER:
 		return (long)hose->first_busno;
 	case IOBASE_MEMORY:
 		return (long)hose->pci_mem_offset;
 	case IOBASE_IO:
 		return (long)hose->io_base_phys;
 	case IOBASE_ISA_IO:
 		return (long)isa_io_base;
 	case IOBASE_ISA_MEM:
 		return -EINVAL;
 	}

 	return -EOPNOTSUPP;
 }

 #ifdef CONFIG_NUMA
 int pcibus_to_node(struct pci_bus *bus)
 {
 	struct pci_controller *phb = pci_bus_to_host(bus);
 	return phb->node;
 }
 EXPORT_SYMBOL(pcibus_to_node);
 #endif
	/*
	* Port for PPC64 David Engebretsen, IBM Corp.
	* Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
	*
	* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
	* Rework, based on alpha PCI code.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#undef DEBUG

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/bootmem.h>
	#include <linux/mm.h>
	#include <linux/list.h>
	#include <linux/syscalls.h>
	#include <linux/irq.h>
	#include <linux/vmalloc.h>

	#include <asm/processor.h>
	#include <asm/io.h>
	#include <asm/prom.h>
	#include <asm/pci-bridge.h>
	#include <asm/byteorder.h>
	#include <asm/machdep.h>
	#include <asm/ppc-pci.h>

	unsigned long pci_probe_only = 1;

	/* pci_io_base -- the base address from which io bars are offsets.
	* This is the lowest I/O base address (so bar values are always positive),
	* and it must be the start of ISA space if an ISA bus exists because
	* ISA drivers use hard coded offsets. If no ISA bus exists nothing
	* is mapped on the first 64K of IO space
	*/
	unsigned long pci_io_base = ISA_IO_BASE;
	EXPORT_SYMBOL(pci_io_base);

	static int __init pcibios_init(void)
	{
	struct pci_controller hose, tmp;

	printk(KERN_INFO "PCI: Probing PCI hardware\n");

	/* For now, override phys_mem_access_prot. If we need it,g
	* later, we may move that initialization to each ppc_md
	*/
	ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;

	if (pci_probe_only)
	pci_add_flags(PCI_PROBE_ONLY);

	/* On ppc64, we always enable PCI domains and we keep domain 0
	* backward compatible in /proc for video cards
	*/
	pci_add_flags(PCI_ENABLE_PROC_DOMAINS \| PCI_COMPAT_DOMAIN_0);

	/* Scan all of the recorded PCI controllers. */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
	pcibios_scan_phb(hose);
	pci_bus_add_devices(hose->bus);
	}

	/* Call common code to handle resource allocation */
	pcibios_resource_survey();

	printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");

	return 0;
	}

	subsys_initcall(pcibios_init);

	#ifdef CONFIG_HOTPLUG

	int pcibios_unmap_io_space(struct pci_bus *bus)
	{
	struct pci_controller *hose;

	WARN_ON(bus == NULL);

	/* If this is not a PHB, we only flush the hash table over
	* the area mapped by this bridge. We don't play with the PTE
	* mappings since we might have to deal with sub-page alignemnts
	* so flushing the hash table is the only sane way to make sure
	* that no hash entries are covering that removed bridge area
	* while still allowing other busses overlapping those pages
	*
	* Note: If we ever support P2P hotplug on Book3E, we'll have
	* to do an appropriate TLB flush here too
	*/
	if (bus->self) {
	#ifdef CONFIG_PPC_STD_MMU_64
	struct resource *res = bus->resource[0];
	#endif

	pr_debug("IO unmapping for PCI-PCI bridge %s\n",
	pci_name(bus->self));

	#ifdef CONFIG_PPC_STD_MMU_64
	__flush_hash_table_range(&init_mm, res->start + _IO_BASE,
	res->end + _IO_BASE + 1);
	#endif
	return 0;
	}

	/* Get the host bridge */
	hose = pci_bus_to_host(bus);

	/* Check if we have IOs allocated */
	if (hose->io_base_alloc == 0)
	return 0;

	pr_debug("IO unmapping for PHB %s\n", hose->dn->full_name);
	pr_debug(" alloc=0x%p\n", hose->io_base_alloc);

	/* This is a PHB, we fully unmap the IO area */
	vunmap(hose->io_base_alloc);

	return 0;
	}
	EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);

	#endif /* CONFIG_HOTPLUG */

	int __devinit pcibios_map_io_space(struct pci_bus *bus)
	{
	struct vm_struct *area;
	unsigned long phys_page;
	unsigned long size_page;
	unsigned long io_virt_offset;
	struct pci_controller *hose;

	WARN_ON(bus == NULL);

	/* If this not a PHB, nothing to do, page tables still exist and
	* thus HPTEs will be faulted in when needed
	*/
	if (bus->self) {
	pr_debug("IO mapping for PCI-PCI bridge %s\n",
	pci_name(bus->self));
	pr_debug(" virt=0x%016llx...0x%016llx\n",
	bus->resource[0]->start + _IO_BASE,
	bus->resource[0]->end + _IO_BASE);
	return 0;
	}

	/* Get the host bridge */
	hose = pci_bus_to_host(bus);
	phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
	size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);

	/* Make sure IO area address is clear */
	hose->io_base_alloc = NULL;

	/* If there's no IO to map on that bus, get away too */
	if (hose->pci_io_size == 0 \|\| hose->io_base_phys == 0)
	return 0;

	/* Let's allocate some IO space for that guy. We don't pass
	* VM_IOREMAP because we don't care about alignment tricks that
	* the core does in that case. Maybe we should due to stupid card
	* with incomplete address decoding but I'd rather not deal with
	* those outside of the reserved 64K legacy region.
	*/
	area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
	if (area == NULL)
	return -ENOMEM;
	hose->io_base_alloc = area->addr;
	hose->io_base_virt = (void __iomem *)(area->addr +
	hose->io_base_phys - phys_page);

	pr_debug("IO mapping for PHB %s\n", hose->dn->full_name);
	pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
	hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
	pr_debug(" size=0x%016llx (alloc=0x%016lx)\n",
	hose->pci_io_size, size_page);

	/* Establish the mapping */
	if (__ioremap_at(phys_page, area->addr, size_page,
	_PAGE_NO_CACHE \| _PAGE_GUARDED) == NULL)
	return -ENOMEM;

	/* Fixup hose IO resource */
	io_virt_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
	hose->io_resource.start += io_virt_offset;
	hose->io_resource.end += io_virt_offset;

	pr_debug(" hose->io_resource=%pR\n", &hose->io_resource);

	return 0;
	}
	EXPORT_SYMBOL_GPL(pcibios_map_io_space);

	void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
	{
	pcibios_map_io_space(hose->bus);
	}

	#define IOBASE_BRIDGE_NUMBER 0
	#define IOBASE_MEMORY 1
	#define IOBASE_IO 2
	#define IOBASE_ISA_IO 3
	#define IOBASE_ISA_MEM 4

	long sys_pciconfig_iobase(long which, unsigned long in_bus,
	unsigned long in_devfn)
	{
	struct pci_controller* hose;
	struct list_head *ln;
	struct pci_bus *bus = NULL;
	struct device_node *hose_node;

	/* Argh ! Please forgive me for that hack, but that's the
	* simplest way to get existing XFree to not lockup on some
	* G5 machines... So when something asks for bus 0 io base
	* (bus 0 is HT root), we return the AGP one instead.
	*/
	if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) {
	struct device_node *agp;

	agp = of_find_compatible_node(NULL, NULL, "u3-agp");
	if (agp)
	in_bus = 0xf0;
	of_node_put(agp);
	}

	/* That syscall isn't quite compatible with PCI domains, but it's
	* used on pre-domains setup. We return the first match
	*/

	for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
	bus = pci_bus_b(ln);
	if (in_bus >= bus->number && in_bus <= bus->subordinate)
	break;
	bus = NULL;
	}
	if (bus == NULL \|\| bus->dev.of_node == NULL)
	return -ENODEV;

	hose_node = bus->dev.of_node;
	hose = PCI_DN(hose_node)->phb;

	switch (which) {
	case IOBASE_BRIDGE_NUMBER:
	return (long)hose->first_busno;
	case IOBASE_MEMORY:
	return (long)hose->pci_mem_offset;
	case IOBASE_IO:
	return (long)hose->io_base_phys;
	case IOBASE_ISA_IO:
	return (long)isa_io_base;
	case IOBASE_ISA_MEM:
	return -EINVAL;
	}

	return -EOPNOTSUPP;
	}

	#ifdef CONFIG_NUMA
	int pcibus_to_node(struct pci_bus *bus)
	{
	struct pci_controller *phb = pci_bus_to_host(bus);
	return phb->node;
	}
	EXPORT_SYMBOL(pcibus_to_node);
	#endif