bios.c

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#include <linux/pci.h>
#include <linux/kernel.h>
#include <arch/hwregs/intr_vect.h>

void __devinit  pcibios_fixup_bus(struct pci_bus *b)
{
}

void pcibios_set_master(struct pci_dev *dev)
{
    u8 lat;
    pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
    printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
    pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}

int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
            enum pci_mmap_state mmap_state, int write_combine)
{
    unsigned long prot;

    /* Leave vm_pgoff as-is, the PCI space address is the physical
     * address on this platform.
     */
    prot = pgprot_val(vma->vm_page_prot);
    vma->vm_page_prot = __pgprot(prot);

    /* Write-combine setting is ignored, it is changed via the mtrr
     * interfaces on this platform.
     */
    if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
                 vma->vm_end - vma->vm_start,
                 vma->vm_page_prot))
        return -EAGAIN;

    return 0;
}

resource_size_t
pcibios_align_resource(void *data, const struct resource *res,
               resource_size_t size, resource_size_t align)
{
    resource_size_t start = res->start;

    if ((res->flags & IORESOURCE_IO) && (start & 0x300))
        start = (start + 0x3ff) & ~0x3ff;

    return start;
}

int pcibios_enable_resources(struct pci_dev *dev, int mask)
{
    u16 cmd, old_cmd;
    int idx;
    struct resource *r;

    pci_read_config_word(dev, PCI_COMMAND, &cmd);
    old_cmd = cmd;
    for(idx=0; idx<6; idx++) {
        /* Only set up the requested stuff */
        if (!(mask & (1<<idx)))
            continue;

        r = &dev->resource[idx];
        if (!r->start && r->end) {
            printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
            return -EINVAL;
        }
        if (r->flags & IORESOURCE_IO)
            cmd |= PCI_COMMAND_IO;
        if (r->flags & IORESOURCE_MEM)
            cmd |= PCI_COMMAND_MEMORY;
    }
    if (dev->resource[PCI_ROM_RESOURCE].start)
        cmd |= PCI_COMMAND_MEMORY;
    if (cmd != old_cmd) {
        printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
        pci_write_config_word(dev, PCI_COMMAND, cmd);
    }
    return 0;
}

int pcibios_enable_irq(struct pci_dev *dev)
{
    dev->irq = EXT_INTR_VECT;
    return 0;
}

int pcibios_enable_device(struct pci_dev *dev, int mask)
{
    int err;

    if ((err = pcibios_enable_resources(dev, mask)) < 0)
        return err;

    if (!dev->msi_enabled)
        pcibios_enable_irq(dev);
    return 0;
}