/***********************************************************************
* Copyright 2001 MontaVista Software Inc.
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
*
* arch/mips/ddb5xxx/ddb5477/pci_ops.c
* Define the pci_ops for DB5477.
*
* Much of the code is derived from the original DDB5074 port by
* Geert Uytterhoeven <geert@sonycom.com>
*
* 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.
***********************************************************************
*/
/*
* DDB5477 has two PCI channels, external PCI and IOPIC (internal)
* Therefore we provide two sets of pci_ops.
*/
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <asm/addrspace.h>
#include <asm/debug.h>
#include <asm/ddb5xxx/ddb5xxx.h>
/*
* config_swap structure records what set of pdar/pmr are used
* to access pci config space. It also provides a place hold the
* original values for future restoring.
*/
struct pci_config_swap {
u32 pdar;
u32 pmr;
u32 config_base;
u32 config_size;
u32 pdar_backup;
u32 pmr_backup;
};
/*
* On DDB5477, we have two sets of swap registers, for ext PCI and IOPCI.
*/
struct pci_config_swap ext_pci_swap = {
DDB_PCIW0,
DDB_PCIINIT00,
DDB_PCI0_CONFIG_BASE,
DDB_PCI0_CONFIG_SIZE
};
struct pci_config_swap io_pci_swap = {
DDB_IOPCIW0,
DDB_PCIINIT01,
DDB_PCI1_CONFIG_BASE,
DDB_PCI1_CONFIG_SIZE
};
/*
* access config space
*/
static inline u32 ddb_access_config_base(struct pci_config_swap *swap, u32 bus, /* 0 means top level bus */
u32 slot_num)
{
u32 pci_addr = 0;
u32 pciinit_offset = 0;
u32 virt_addr;
u32 option;
/* minimum pdar (window) size is 2MB */
db_assert(swap->config_size >= (2 << 20));
db_assert(slot_num < (1 << 5));
db_assert(bus < (1 << 8));
/* backup registers */
swap->pdar_backup = ddb_in32(swap->pdar);
swap->pmr_backup = ddb_in32(swap->pmr);
/* set the pdar (pci window) register */
ddb_set_pdar(swap->pdar, swap->config_base, swap->config_size, 32, /* 32 bit wide */
0, /* not on local memory bus */
0); /* not visible from PCI bus (N/A) */
/*
* calcuate the absolute pci config addr;
* according to the spec, we start scanning from adr:11 (0x800)
*/
if (bus == 0) {
/* type 0 config */
pci_addr = 0x800 << slot_num;
} else {
/* type 1 config */
pci_addr = (bus << 16) | (slot_num << 11);
}
/*
* if pci_addr is less than pci config window size, we set
* pciinit_offset to 0 and adjust the virt_address.
* Otherwise we will try to adjust pciinit_offset.
*/
if (pci_addr < swap->config_size) {
virt_addr = KSEG1ADDR(swap->config_base + pci_addr);
pciinit_offset = 0;
} else {
db_assert((pci_addr & (swap->config_size - 1)) == 0);
virt_addr = KSEG1ADDR(swap->config_base);
pciinit_offset = pci_addr;
}
/* set the pmr register */
option = DDB_PCI_ACCESS_32;
if (bus != 0)
option |= DDB_PCI_CFGTYPE1;
ddb_set_pmr(swap->pmr, DDB_PCICMD_CFG, pciinit_offset, option);
return virt_addr;
}
static inline void ddb_close_config_base(struct pci_config_swap *swap)
{
ddb_out32(swap->pdar, swap->pdar_backup);
ddb_out32(swap->pmr, swap->pmr_backup);
}
static int read_config_dword(struct pci_config_swap *swap,
struct pci_bus *bus, u32 devfn, u32 where,
u32 * val)
{
u32 bus_num, slot_num, func_num;
u32 base;
db_assert((where & 3) == 0);
db_assert(where < (1 << 8));
/* check if the bus is top-level */
if (bus->parent != NULL) {
bus_num = bus->number;
db_assert(bus_num != 0);
} else {
bus_num = 0;
}
slot_num = PCI_SLOT(devfn);
func_num = PCI_FUNC(devfn);
base = ddb_access_config_base(swap, bus_num, slot_num);
*val = *(volatile u32 *) (base + (func_num << 8) + where);
ddb_close_config_base(swap);
return PCIBIOS_SUCCESSFUL;
}
static int read_config_word(struct pci_config_swap *swap,
struct pci_bus *bus, u32 devfn, u32 where,
u16 * val)
{
int status;
u32 result;
db_assert((where & 1) == 0);
status = read_config_dword(swap, bus, devfn, where & ~3, &result);
if (where & 2)
result >>= 16;
*val = result & 0xffff;
return status;
}
static int read_config_byte(struct pci_config_swap *swap,
struct pci_bus *bus, u32 devfn, u32 where,
u8 * val)
{
int status;
u32 result;
status = read_config_dword(swap, bus, devfn, where & ~3, &result);
if (where & 1)
result >>= 8;
if (where & 2)
result >>= 16;
*val = result & 0xff;
return status;
}
static int write_config_dword(struct pci_config_swap *swap,
struct pci_bus *bus, u32 devfn, u32 where,
u32 val)
{
u32 bus_num, slot_num, func_num;
u32 base;
db_assert((where & 3) == 0);
db_assert(where < (1 << 8));
/* check if the bus is top-level */
if (bus->parent != NULL) {
bus_num = bus->number;
db_assert(bus_num != 0);
} else {
bus_num = 0;
}
slot_num = PCI_SLOT(devfn);
func_num = PCI_FUNC(devfn);
base = ddb_access_config_base(swap, bus_num, slot_num);
*(volatile u32 *) (base + (func_num << 8) + where) = val;
ddb_close_config_base(swap);
return PCIBIOS_SUCCESSFUL;
}
static int write_config_word(struct pci_config_swap *swap,
struct pci_bus *bus, u32 devfn, u32 where, u16 val)
{
int status, shift = 0;
u32 result;
db_assert((where & 1) == 0);
status = read_config_dword(swap, bus, devfn, where & ~3, &result);
if (status != PCIBIOS_SUCCESSFUL)
return status;
if (where & 2)
shift += 16;
result &= ~(0xffff << shift);
result |= val << shift;
return write_config_dword(swap, bus, devfn, where & ~3, result);
}
static int write_config_byte(struct pci_config_swap *swap,
struct pci_bus *bus, u32 devfn, u32 where, u8 val)
{
int status, shift = 0;
u32 result;
status = read_config_dword(swap, bus, devfn, where & ~3, &result);
if (status != PCIBIOS_SUCCESSFUL)
return status;
if (where & 2)
shift += 16;
if (where & 1)
shift += 8;
result &= ~(0xff << shift);
result |= val << shift;
return write_config_dword(swap, bus, devfn, where & ~3, result);
}
#define MAKE_PCI_OPS(prefix, rw, pciswap, star) \
static int prefix##_##rw##_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 star val) \
{ \
if (size == 1) \
return rw##_config_byte(pciswap, bus, devfn, where, (u8 star)val); \
else if (size == 2) \
return rw##_config_word(pciswap, bus, devfn, where, (u16 star)val); \
/* Size must be 4 */ \
return rw##_config_dword(pciswap, bus, devfn, where, val); \
}
MAKE_PCI_OPS(extpci, read, &ext_pci_swap, *)
MAKE_PCI_OPS(extpci, write, &ext_pci_swap,)
MAKE_PCI_OPS(iopci, read, &io_pci_swap, *)
MAKE_PCI_OPS(iopci, write, &io_pci_swap,)
struct pci_ops ddb5477_ext_pci_ops = {
.read = extpci_read_config,
.write = extpci_write_config
};
struct pci_ops ddb5477_io_pci_ops = {
.read = iopci_read_config,
.write = iopci_write_config
};
