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/*
*
* BRIEF MODULE DESCRIPTION
* IT8172 system controller specific pci support.
*
* Copyright 2000 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ppopov@mvista.com or source@mvista.com
*
* Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
*
* 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/it8172/it8172.h>
#include <asm/it8172/it8172_pci.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
static struct resource pci_mem_resource_1;
static struct resource pci_io_resource = {
"io pci IO space",
0x14018000,
0x17FFFFFF,
IORESOURCE_IO
};
static struct resource pci_mem_resource_0 = {
"ext pci memory space 0/1",
0x10101000,
0x13FFFFFF,
IORESOURCE_MEM,
&pci_mem_resource_0,
NULL,
&pci_mem_resource_1
};
static struct resource pci_mem_resource_1 = {
"ext pci memory space 2/3",
0x1A000000,
0x1FBFFFFF,
IORESOURCE_MEM,
&pci_mem_resource_0,
NULL,
NULL
};
extern struct pci_ops it8172_pci_ops;
struct pci_controller it8172_controller = {
.pci_ops = &it8172_pci_ops,
.io_resource = &pci_io_resource,
.mem_resource = &pci_mem_resource_0,
};
static int it8172_pcibios_config_access(unsigned char access_type,
struct pci_bus *bus,
unsigned int devfn, int where,
u32 * data)
{
/*
* config cycles are on 4 byte boundary only
*/
/* Setup address */
IT_WRITE(IT_CONFADDR, (bus->number << IT_BUSNUM_SHF) |
(devfn << IT_FUNCNUM_SHF) | (where & ~0x3));
if (access_type == PCI_ACCESS_WRITE) {
IT_WRITE(IT_CONFDATA, *data);
} else {
IT_READ(IT_CONFDATA, *data);
}
/*
* Revisit: check for master or target abort.
*/
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 write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
u32 data = 0;
switch (size) {
case 1:
if (it8172_pcibios_config_access
(PCI_ACCESS_READ, dev, where, &data))
return -1;
*val = (data >> ((where & 3) << 3)) & 0xff;
return PCIBIOS_SUCCESSFUL;
case 2:
if (where & 1)
return PCIBIOS_BAD_REGISTER_NUMBER;
if (it8172_pcibios_config_access
(PCI_ACCESS_READ, dev, where, &data))
return -1;
*val = (data >> ((where & 3) << 3)) & 0xffff;
DBG("cfg read word: bus %d dev_fn %x where %x: val %x\n",
dev->bus->number, dev->devfn, where, *val);
return PCIBIOS_SUCCESSFUL;
case 4:
if (where & 3)
return PCIBIOS_BAD_REGISTER_NUMBER;
if (it8172_pcibios_config_access
(PCI_ACCESS_READ, dev, where, &data))
return -1;
*val = data;
return PCIBIOS_SUCCESSFUL;
}
}
static write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
u32 data = 0;
switch (size) {
case 1:
if (it8172_pcibios_config_access
(PCI_ACCESS_READ, dev, where, &data))
return -1;
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
if (it8172_pcibios_config_access
(PCI_ACCESS_WRITE, dev, where, &data))
return -1;
return PCIBIOS_SUCCESSFUL;
case 2:
if (where & 1)
return PCIBIOS_BAD_REGISTER_NUMBER;
if (it8172_pcibios_config_access
(PCI_ACCESS_READ, dev, where, &data))
eturn - 1;
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
if (it8172_pcibios_config_access
(PCI_ACCESS_WRITE, dev, where, &data))
return -1;
return PCIBIOS_SUCCESSFUL;
case 4:
if (where & 3)
return PCIBIOS_BAD_REGISTER_NUMBER;
if (it8172_pcibios_config_access
(PCI_ACCESS_WRITE, dev, where, &val))
return -1;
return PCIBIOS_SUCCESSFUL;
}
}
struct pci_ops it8172_pci_ops = {
.read = read_config,
.write = write_config,
};
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