bios.c

linux内核源码

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

void __devinit  pcibios_fixup_bus(struct pci_bus *b)
{
}

char * __devinit  pcibios_setup(char *str)
{
	return NULL;
}

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;
}

void
pcibios_align_resource(void *data, struct resource *res,
		       resource_size_t size, resource_size_t align)
{
	if (res->flags & IORESOURCE_IO) {
		resource_size_t start = res->start;

		if (start & 0x300) {
			start = (start + 0x3ff) & ~0x3ff;
			res->start = 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;
}

int pcibios_assign_resources(void)
{
	struct pci_dev *dev = NULL;
	int idx;
	struct resource *r;

	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		int class = dev->class >> 8;

		/* Don't touch classless devices and host bridges */
		if (!class || class == PCI_CLASS_BRIDGE_HOST)
			continue;

		for(idx=0; idx<6; idx++) {
			r = &dev->resource[idx];

			if (!r->start && r->end)
				pci_assign_resource(dev, idx);
		}
	}
	return 0;
}

EXPORT_SYMBOL(pcibios_assign_resources);