mirror of https://gitee.com/openkylin/linux.git
287 lines
7.0 KiB
C
287 lines
7.0 KiB
C
/*
|
|
* Copyright 2001 MontaVista Software Inc.
|
|
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
|
|
*
|
|
* arch/mips/ddb5xxx/ddb5476/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.
|
|
*
|
|
*/
|
|
#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 DDB5476, we have one set of swap registers
|
|
*/
|
|
struct pci_config_swap ext_pci_swap = {
|
|
DDB_PCIW0,
|
|
DDB_PCIINIT0,
|
|
DDB_PCI_CONFIG_BASE,
|
|
DDB_PCI_CONFIG_SIZE
|
|
};
|
|
|
|
static int pci_config_workaround = 1;
|
|
|
|
/*
|
|
* 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 = swap->config_base;
|
|
u32 option;
|
|
|
|
if (pci_config_workaround) {
|
|
/* [jsun] work around Vrc5476 controller itself, returnning
|
|
* slot 0 essentially makes vrc5476 invisible
|
|
*/
|
|
if (slot_num == 12)
|
|
slot_num = 0;
|
|
|
|
#if 0
|
|
/* BUG : skip P2P bridge for now */
|
|
if (slot_num == 5)
|
|
slot_num = 0;
|
|
#endif
|
|
|
|
} else {
|
|
/* now we have to be hornest, returning the true
|
|
* PCI config headers for vrc5476
|
|
*/
|
|
if (slot_num == 12) {
|
|
swap->pdar_backup = ddb_in32(swap->pdar);
|
|
swap->pmr_backup = ddb_in32(swap->pmr);
|
|
return DDB_BASE + DDB_PCI_BASE;
|
|
}
|
|
}
|
|
|
|
/* 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);
|
|
/* panic("ddb_access_config_base: we don't support type 1 config Yet"); */
|
|
}
|
|
|
|
/*
|
|
* 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_dev *dev, u32 where, u32 * val)
|
|
{
|
|
u32 bus, slot_num, func_num;
|
|
u32 base;
|
|
|
|
db_assert((where & 3) == 0);
|
|
db_assert(where < (1 << 8));
|
|
|
|
/* check if the bus is top-level */
|
|
if (dev->bus->parent != NULL) {
|
|
bus = dev->bus->number;
|
|
db_assert(bus != 0);
|
|
} else {
|
|
bus = 0;
|
|
}
|
|
|
|
slot_num = PCI_SLOT(dev->devfn);
|
|
func_num = PCI_FUNC(dev->devfn);
|
|
base = ddb_access_config_base(swap, bus, 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_dev *dev, u32 where, u16 * val)
|
|
{
|
|
int status;
|
|
u32 result;
|
|
|
|
db_assert((where & 1) == 0);
|
|
|
|
status = read_config_dword(swap, dev, 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_dev *dev, u32 where, u8 * val)
|
|
{
|
|
int status;
|
|
u32 result;
|
|
|
|
status = read_config_dword(swap, dev, 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_dev *dev, u32 where, u32 val)
|
|
{
|
|
u32 bus, slot_num, func_num;
|
|
u32 base;
|
|
|
|
db_assert((where & 3) == 0);
|
|
db_assert(where < (1 << 8));
|
|
|
|
/* check if the bus is top-level */
|
|
if (dev->bus->parent != NULL) {
|
|
bus = dev->bus->number;
|
|
db_assert(bus != 0);
|
|
} else {
|
|
bus = 0;
|
|
}
|
|
|
|
slot_num = PCI_SLOT(dev->devfn);
|
|
func_num = PCI_FUNC(dev->devfn);
|
|
base = ddb_access_config_base(swap, bus, 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_dev *dev, u32 where, u16 val)
|
|
{
|
|
int status, shift = 0;
|
|
u32 result;
|
|
|
|
db_assert((where & 1) == 0);
|
|
|
|
status = read_config_dword(swap, dev, 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, dev, where & ~3, result);
|
|
}
|
|
|
|
static int write_config_byte(struct pci_config_swap *swap,
|
|
struct pci_dev *dev, u32 where, u8 val)
|
|
{
|
|
int status, shift = 0;
|
|
u32 result;
|
|
|
|
status = read_config_dword(swap, dev, 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, dev, where & ~3, result);
|
|
}
|
|
|
|
#define MAKE_PCI_OPS(prefix, rw, unitname, unittype, pciswap) \
|
|
static int prefix##_##rw##_config_##unitname(struct pci_dev *dev, int where, unittype val) \
|
|
{ \
|
|
return rw##_config_##unitname(pciswap, \
|
|
dev, \
|
|
where, \
|
|
val); \
|
|
}
|
|
|
|
MAKE_PCI_OPS(extpci, read, byte, u8 *, &ext_pci_swap)
|
|
MAKE_PCI_OPS(extpci, read, word, u16 *, &ext_pci_swap)
|
|
MAKE_PCI_OPS(extpci, read, dword, u32 *, &ext_pci_swap)
|
|
|
|
MAKE_PCI_OPS(extpci, write, byte, u8, &ext_pci_swap)
|
|
MAKE_PCI_OPS(extpci, write, word, u16, &ext_pci_swap)
|
|
MAKE_PCI_OPS(extpci, write, dword, u32, &ext_pci_swap)
|
|
|
|
struct pci_ops ddb5476_ext_pci_ops = {
|
|
extpci_read_config_byte,
|
|
extpci_read_config_word,
|
|
extpci_read_config_dword,
|
|
extpci_write_config_byte,
|
|
extpci_write_config_word,
|
|
extpci_write_config_dword
|
|
};
|