path: root/arch/ppc/kernel/pci.c

/*
 * Common prep/chrp pci routines. -- Cort
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/bootmem.h>

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

#undef DEBUG

#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif

unsigned long isa_io_base     = 0;
unsigned long isa_mem_base    = 0;
unsigned long pci_dram_offset = 0;
int pcibios_assign_bus_offset = 1;

void pcibios_make_OF_bus_map(void);

static int pci_relocate_bridge_resource(struct pci_bus *bus, int i);
static int probe_resource(struct pci_bus *parent, struct resource *pr,
			  struct resource *res, struct resource **conflict);
static void update_bridge_base(struct pci_bus *bus, int i);
static void pcibios_fixup_resources(struct pci_dev* dev);
static void fixup_broken_pcnet32(struct pci_dev* dev);
static int reparent_resources(struct resource *parent, struct resource *res);
static void fixup_cpc710_pci64(struct pci_dev* dev);

/* By default, we don't re-assign bus numbers.
 */
int pci_assign_all_buses;

struct pci_controller* hose_head;
struct pci_controller** hose_tail = &hose_head;

static int pci_bus_count;

static void
fixup_broken_pcnet32(struct pci_dev* dev)
{
	if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
		dev->vendor = PCI_VENDOR_ID_AMD;
		pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
	}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT,	PCI_ANY_ID,			fixup_broken_pcnet32);

static void
fixup_cpc710_pci64(struct pci_dev* dev)
{
	/* Hide the PCI64 BARs from the kernel as their content doesn't
	 * fit well in the resource management
	 */
	dev->resource[0].start = dev->resource[0].end = 0;
	dev->resource[0].flags = 0;
	dev->resource[1].start = dev->resource[1].end = 0;
	dev->resource[1].flags = 0;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);

static void
pcibios_fixup_resources(struct pci_dev *dev)
{
	struct pci_controller* hose = (struct pci_controller *)dev->sysdata;
	int i;
	unsigned long offset;

	if (!hose) {
		printk(KERN_ERR "No hose for PCI dev %s!\n", pci_name(dev));
		return;
	}
	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
		struct resource *res = dev->resource + i;
		if (!res->flags)
			continue;
		if (res->end == 0xffffffff) {
			DBG("PCI:%s Resource %d [%08lx-%08lx] is unassigned\n",
			    pci_name(dev), i, res->start, res->end);
			res->end -= res->start;
			res->start = 0;
			res->flags |= IORESOURCE_UNSET;
			continue;
		}
		offset = 0;
		if (res->flags & IORESOURCE_MEM) {
			offset = hose->pci_mem_offset;
		} else if (res->flags & IORESOURCE_IO) {
			offset = (unsigned long) hose->io_base_virt
				- isa_io_base;
		}
		if (offset != 0) {
			res->start += offset;
			res->end += offset;
#ifdef DEBUG
			printk("Fixup res %d (%lx) of dev %s: %lx -> %lx\n",
			       i, res->flags, pci_name(dev),
			       res->start - offset, res->start);
#endif
		}
	}

	/* Call machine specific resource fixup */
	if (ppc_md.pcibios_fixup_resources)
		ppc_md.pcibios_fixup_resources(dev);
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID,		PCI_ANY_ID,			pcibios_fixup_resources);

void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
			struct resource *res)
{
	unsigned long offset = 0;
	struct pci_controller *hose = dev->sysdata;

	if (hose && res->flags & IORESOURCE_IO)
		offset = (unsigned long)hose->io_base_virt - isa_io_base;
	else if (hose && res->flags & IORESOURCE_MEM)
		offset = hose->pci_mem_offset;
	region->start = res->start - offset;
	region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);

void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
			     struct pci_bus_region *region)
{
	unsigned long offset = 0;
	struct pci_controller *hose = dev->sysdata;

	if (hose && res->flags & IORESOURCE_IO)
		offset = (unsigned long)hose->io_base_virt - isa_io_base;
	else if (hose &&