Orion

/*
 * This file contains the routines for accessing the PCI devices.  It just wraps
 * the IO functions necessary to read/write the PCI Configuration Space.  It
 * uses PCI Configuration Space Access Mechanism #1, which is the most supported
 * access mechanism.
 */

#include <stdint.h>
#include "pci.h"
#include "../io.h"

/* Read PCI config */
uint8_t
pci_read_byte(int bus, int dev, int func, int off)
{
	outl(0xCF8, (1 << 31) | (bus << 16) | (dev << 11) |
	            (func << 8) | (off & 0xFC));
	return inb(0xCFC + (off & 3));
}
uint16_t
pci_read_word(int bus, int dev, int func, int off)
{
	outl(0xCF8, (1 << 31) | (bus << 16) | (dev << 11) |
	            (func << 8) | (off & 0xFC));
	return inw(0xCFC + (off & 2));
}
uint32_t
pci_read_dword(int bus, int dev, int func, int off)
{
	outl(0xCF8, (1 << 31) | (bus << 16) | (dev << 11) |
	            (func << 8) | (off & 0xFC));
	return inl(0xCFC);
}
/* Write PCI config */
void
pci_write_byte(int bus, int dev, int func, int off, uint8_t value)
{
	outl(0xCF8, (1 << 31) | (bus << 16) | (dev << 11) |
	            (func << 8) | (off & 0xFC));
	outb(0xCFC + (off & 3), value);
}
void
pci_write_word(int bus, int dev, int func, int off, uint16_t value)
{
	outl(0xCF8, (1 << 31) | (bus << 16) | (dev << 11) |
	            (func << 8) | (off & 0xFC));
	outw(0xCFC + (off & 2), value);
}
void
pci_write_dword(int bus, int dev, int func, int off, uint32_t value)
{
	outl(0xCF8, (1 << 31) | (bus << 16) | (dev << 11) |
	            (func << 8) | (off & 0xFC));
	outl(0xCFC, value);
}