/*
*
* BRIEF MODULE DESCRIPTION
* Galileo EV96100 board specific pci support.
*
* Copyright 2000 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ppopov@mvista.com or source@mvista.com
*
* This file was derived from Carsten Langgaard's
* arch/mips/mips-boards/generic/pci.c
*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/delay.h>
#include <asm/gt64120.h>
#include <asm/galileo-boards/ev96100.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
static int static gt96100_config_access(unsigned char access_type,
struct pci_bus *bus, unsigned int devfn, int where, u32 * data)
{
unsigned char bus = bus->number;
u32 intr;
/*
* Because of a bug in the galileo (for slot 31).
*/
if (bus == 0 && devfn >= PCI_DEVFN(31, 0))
return PCIBIOS_DEVICE_NOT_FOUND;
/* Clear cause register bits */
GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT |
GT_INTRCAUSE_TARABORT0_BIT));
/* Setup address */
GT_WRITE(GT_PCI0_CFGADDR_OFS,
(bus << GT_PCI0_CFGADDR_BUSNUM_SHF) |
(devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF) |
((where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF) |
GT_PCI0_CFGADDR_CONFIGEN_BIT);
udelay(2);
if (access_type == PCI_ACCESS_WRITE) {
if (devfn != 0)
*data = le32_to_cpu(*data);
GT_WRITE(GT_PCI0_CFGDATA_OFS, *data);
} else {
*data = GT_READ(GT_PCI0_CFGDATA_OFS);
if (devfn != 0)
*data = le32_to_cpu(*data);
}
udelay(2);
/* Check for master or target abort */
intr = GT_READ(GT_INTRCAUSE_OFS);
if (intr & (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)) {
/* Error occured */
/* Clear bits */
GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT |
GT_INTRCAUSE_TARABORT0_BIT));
return -1;
}
return 0;
}
/*
* We can't address 8 and 16 bit words directly. Instead we have to
* read/write a 32bit word and mask/modify the data we actually want.
*/
static int gt96100_pcibios_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * val)
{
u32 data = 0;
if (gt96100_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
return PCIBIOS_DEVICE_NOT_FOUND;
switch (size) {
case 1:
*val = (data >> ((where & 3) << 3)) & 0xff;
break;
case 2:
*val = (data >> ((where & 3) << 3)) & 0xffff;
break;
case 4:
*val = data;
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int gt96100_pcibios_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 data = 0;
switch (size) {
case 1:
if (gt96100_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
return -1;
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
if (gt96100_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
return -1;
return PCIBIOS_SUCCESSFUL;
case 2:
if (gt96100_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
return -1;
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
if (gt96100_config_access(PCI_ACCESS_WRITE, dev, where, &data))
return -1;
return PCIBIOS_SUCCESSFUL;
case 4:
if (gt96100_config_access(PCI_ACCESS_WRITE, dev, where, &val))
return -1;
return PCIBIOS_SUCCESSFUL;
}
}
struct pci_ops gt96100_pci_ops = {
.read = gt96100_pcibios_read,
.write = gt96100_pcibios_write
};
