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/*
* fuloong2e specific PCI support.
*
* Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
* All rights reserved.
* Authors: Carsten Langgaard <carstenl@mips.com>
* Maciej W. Rozycki <macro@mips.com>
*
* Copyright (C) 2009 Lemote Inc.
* Author: Wu Zhangjin <wuzj@lemote.com>
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <loongson.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
#define CFG_SPACE_REG(offset) \
(void *)CKSEG1ADDR(LOONGSON_PCICFG_BASE | (offset))
#define ID_SEL_BEGIN 11
#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
static int loongson_pcibios_config_access(unsigned char access_type,
struct pci_bus *bus,
unsigned int devfn, int where,
u32 *data)
{
u32 busnum = bus->number;
u32 addr, type;
u32 dummy;
void *addrp;
int device = PCI_SLOT(devfn);
int function = PCI_FUNC(devfn);
int reg = where & ~3;
if (busnum == 0) {
/* Type 0 configuration for onboard PCI bus */
if (device > MAX_DEV_NUM)
return -1;
addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
type = 0;
} else {
/* Type 1 configuration for offboard PCI bus */
addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
type = 0x10000;
}
/* Clear aborts */
LOONGSON_PCICMD |= LOONGSON_PCICMD_MABORT_CLR | \
LOONGSON_PCICMD_MTABORT_CLR;
LOONGSON_PCIMAP_CFG = (addr >> 16) | type;
/* Flush Bonito register block */
dummy = LOONGSON_PCIMAP_CFG;
mmiowb();
addrp = CFG_SPACE_REG(addr & 0xffff);
if (access_type == PCI_ACCESS_WRITE)
writel(cpu_to_le32(*data), addrp);
else
*data = le32_to_cpu(readl(addrp));
/* Detect Master/Target abort */
if (LOONGSON_PCICMD & (LOONGSON_PCICMD_MABORT_CLR |
LOONGSON_PCICMD_MTABORT_CLR)) {
/* Error occurred */
/* Clear bits */
LOONGSON_PCICMD |= (LOONGSON_PCICMD_MABORT_CLR |
LOONGSON_PCICMD_MTABORT_CLR);
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 loongson_pcibios_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
u32 data = 0;
if ((size == 2) && (where & 1))
return PCIBIOS_BAD_REGISTER_NUMBER;
else if ((size == 4) && (where & 3))
return PCIBIOS_BAD_REGISTER_NUMBER;
if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
&data))
return -1;
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;
else if (size == 2)
*val = (data >> ((where & 3) << 3)) & 0xffff;
else
*val = data;
return PCIBIOS_SUCCESSFUL;
}
static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 data = 0;
if ((size == 2) && (where & 1))
return PCIBIOS_BAD_REGISTER_NUMBER;
else if ((size == 4) && (where & 3))
return PCIBIOS_BAD_REGISTER_NUMBER;
if (size == 4)
data = val;
else {
if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data))
return -1;
if (size == 1)
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
else if (size == 2)
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
}
if (loongson_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
&data))
return -1;
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops loongson_pci_ops = {
.read = loongson_pcibios_read,
.write = loongson_pcibios_write
};
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