90 строки
2.1 KiB
C
90 строки
2.1 KiB
C
|
/*
|
||
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
||
|
|
* License. See the file "COPYING" in the main directory of this archive
|
||
|
|
* for more details.
|
||
|
|
*
|
||
|
|
* SNI specific PCI support for RM200/RM300.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1997 - 2000, 2003 Ralf Baechle <ralf@linux-mips.org>
|
||
|
|
*/
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/pci.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <asm/sni.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* It seems that on the RM200 only lower 3 bits of the 5 bit PCI device
|
||
|
|
* address are decoded. We therefore manually have to reject attempts at
|
||
|
|
* reading outside this range. Being on the paranoid side we only do this
|
||
|
|
* test for bus 0 and hope forwarding and decoding work properly for any
|
||
|
|
* subordinated busses.
|
||
|
|
*
|
||
|
|
* ASIC PCI only supports type 1 config cycles.
|
||
|
|
*/
|
||
|
|
static int set_config_address(unsigned int busno, unsigned int devfn, int reg)
|
||
|
|
{
|
||
|
|
if ((devfn > 255) || (reg > 255))
|
||
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
||
|
|
|
||
|
|
if (busno == 0 && devfn >= PCI_DEVFN(8, 0))
|
||
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
||
|
|
|
||
|
|
*(volatile u32 *)PCIMT_CONFIG_ADDRESS =
|
||
|
|
((busno & 0xff) << 16) |
|
||
|
|
((devfn & 0xff) << 8) |
|
||
|
|
(reg & 0xfc);
|
||
|
|
|
||
|
|
return PCIBIOS_SUCCESSFUL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int pcimt_read(struct pci_bus *bus, unsigned int devfn, int reg,
|
||
|
|
int size, u32 * val)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
|
||
|
|
if ((res = set_config_address(bus->number, devfn, reg)))
|
||
|
|
return res;
|
||
|
|
|
||
|
|
switch (size) {
|
||
|
|
case 1:
|
||
|
|
*val = *(volatile u8 *) (PCIMT_CONFIG_DATA + (reg & 3));
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
*val = *(volatile u16 *) (PCIMT_CONFIG_DATA + (reg & 2));
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
*val = *(volatile u32 *) PCIMT_CONFIG_DATA;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int pcimt_write(struct pci_bus *bus, unsigned int devfn, int reg,
|
||
|
|
int size, u32 val)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
|
||
|
|
if ((res = set_config_address(bus->number, devfn, reg)))
|
||
|
|
return res;
|
||
|
|
|
||
|
|
switch (size) {
|
||
|
|
case 1:
|
||
|
|
*(volatile u8 *) (PCIMT_CONFIG_DATA + (reg & 3)) = val;
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
*(volatile u16 *) (PCIMT_CONFIG_DATA + (reg & 2)) = val;
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
*(volatile u32 *) PCIMT_CONFIG_DATA = val;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct pci_ops sni_pci_ops = {
|
||
|
|
.read = pcimt_read,
|
||
|
|
.write = pcimt_write,
|
||
|
|
};
|