ops-mace.c
2.25 KB
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/*
* 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.
*
* Copyright (C) 2000, 2001 Keith M Wesolowski
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <asm/pci.h>
#include <asm/ip32/mace.h>
#if 0
# define DPRINTK(args...) printk(args);
#else
# define DPRINTK(args...)
#endif
/*
* O2 has up to 5 PCI devices connected into the MACE bridge. The device
* map looks like this:
*
* 0 aic7xxx 0
* 1 aic7xxx 1
* 2 expansion slot
* 3 N/C
* 4 N/C
*/
static inline int mkaddr(struct pci_bus *bus, unsigned int devfn,
unsigned int reg)
{
return ((bus->number & 0xff) << 16) |
((devfn & 0xff) << 8) |
(reg & 0xfc);
}
static int
mace_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 *val)
{
u32 control = mace->pci.control;
/* disable master aborts interrupts during config read */
mace->pci.control = control & ~MACEPCI_CONTROL_MAR_INT;
mace->pci.config_addr = mkaddr(bus, devfn, reg);
switch (size) {
case 1:
*val = mace->pci.config_data.b[(reg & 3) ^ 3];
break;
case 2:
*val = mace->pci.config_data.w[((reg >> 1) & 1) ^ 1];
break;
case 4:
*val = mace->pci.config_data.l;
break;
}
/* ack possible master abort */
mace->pci.error &= ~MACEPCI_ERROR_MASTER_ABORT;
mace->pci.control = control;
/*
* someone forgot to set the ultra bit for the onboard
* scsi chips; we fake it here
*/
if (bus->number == 0 && reg == 0x40 && size == 4 &&
(devfn == (1 << 3) || devfn == (2 << 3)))
*val |= 0x1000;
DPRINTK("read%d: reg=%08x,val=%02x\n", size * 8, reg, *val);
return PCIBIOS_SUCCESSFUL;
}
static int
mace_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 val)
{
mace->pci.config_addr = mkaddr(bus, devfn, reg);
switch (size) {
case 1:
mace->pci.config_data.b[(reg & 3) ^ 3] = val;
break;
case 2:
mace->pci.config_data.w[((reg >> 1) & 1) ^ 1] = val;
break;
case 4:
mace->pci.config_data.l = val;
break;
}
DPRINTK("write%d: reg=%08x,val=%02x\n", size * 8, reg, val);
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops mace_pci_ops = {
.read = mace_pci_read_config,
.write = mace_pci_write_config,
};