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/*
* Support for indirect PCI bridges.
*
* Copyright (C) 1998 Gabriel Paubert.
*
* 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.
*/
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/system.h>
unsigned int * pci_config_address;
unsigned char * pci_config_data;
int indirect_pcibios_read_config_byte(unsigned char bus, unsigned char dev_fn,
unsigned char offset, unsigned char *val)
{
unsigned long flags;
save_flags(flags); cli();
out_be32(pci_config_address,
((offset&0xfc)<<24) | (dev_fn<<16) | (bus<<8) | 0x80);
*val= in_8(pci_config_data + (offset&3));
restore_flags(flags);
return PCIBIOS_SUCCESSFUL;
}
int indirect_pcibios_read_config_word(unsigned char bus, unsigned char dev_fn,
unsigned char offset, unsigned short *val)
{
unsigned long flags;
if (offset&1) return PCIBIOS_BAD_REGISTER_NUMBER;
save_flags(flags); cli();
out_be32(pci_config_address,
((offset&0xfc)<<24) | (dev_fn<<16) | (bus<<8) | 0x80);
*val= in_le16((unsigned short *)(pci_config_data + (offset&3)));
restore_flags(flags);
return PCIBIOS_SUCCESSFUL;
}
int indirect_pcibios_read_config_dword(unsigned char bus, unsigned char dev_fn,
unsigned char offset, unsigned int *val)
{
unsigned long flags;
if (offset&3) return PCIBIOS_BAD_REGISTER_NUMBER;
save_flags(flags); cli();
out_be32(pci_config_address,
((offset&0xfc)<<24) | (dev_fn<<16) | (bus<<8) | 0x80);
*val= in_le32((unsigned *)pci_config_data);
restore_flags(flags);
return PCIBIOS_SUCCESSFUL;
}
int indirect_pcibios_write_config_byte(unsigned char bus, unsigned char dev_fn,
unsigned char offset, unsigned char val)
{
unsigned long flags;
save_flags(flags); cli();
out_be32(pci_config_address,
((offset&0xfc)<<24) | (dev_fn<<16) | (bus<<8) | 0x80);
out_8(pci_config_data + (offset&3), val);
restore_flags(flags);
return PCIBIOS_SUCCESSFUL;
}
int indirect_pcibios_write_config_word(unsigned char bus, unsigned char dev_fn,
unsigned char offset, unsigned short val)
{
unsigned long flags;
if (offset&1) return PCIBIOS_BAD_REGISTER_NUMBER;
save_flags(flags); cli();
out_be32(pci_config_address,
((offset&0xfc)<<24) | (dev_fn<<16) | (bus<<8) | 0x80);
out_le16((unsigned short *)(pci_config_data + (offset&3)), val);
restore_flags(flags);
return PCIBIOS_SUCCESSFUL;
}
int indirect_pcibios_write_config_dword(unsigned char bus, unsigned char dev_fn,
unsigned char offset, unsigned int val)
{
unsigned long flags;
if (offset&3) return PCIBIOS_BAD_REGISTER_NUMBER;
save_flags(flags); cli();
out_be32(pci_config_address,
((offset&0xfc)<<24) | (dev_fn<<16) | (bus<<8) | 0x80);
out_le32((unsigned *)pci_config_data, val);
restore_flags(flags);
return PCIBIOS_SUCCESSFUL;
}
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