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/*
* amd766rom.c
*
* Normal mappings of chips in physical memory
* $Id: amd766rom.c,v 1.1 2002/01/10 22:59:13 eric Exp $
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/config.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
struct amd766rom_map_info {
struct map_info map;
struct mtd_info *mtd;
unsigned long window_addr;
u32 window_start, window_size;
struct pci_dev *pdev;
};
static __u8 amd766rom_read8(struct map_info *map, unsigned long ofs)
{
return __raw_readb(map->map_priv_1 + ofs);
}
static __u16 amd766rom_read16(struct map_info *map, unsigned long ofs)
{
return __raw_readw(map->map_priv_1 + ofs);
}
static __u32 amd766rom_read32(struct map_info *map, unsigned long ofs)
{
return __raw_readl(map->map_priv_1 + ofs);
}
static void amd766rom_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy_fromio(to, map->map_priv_1 + from, len);
}
static void amd766rom_write8(struct map_info *map, __u8 d, unsigned long adr)
{
__raw_writeb(d, map->map_priv_1 + adr);
mb();
}
static void amd766rom_write16(struct map_info *map, __u16 d, unsigned long adr)
{
__raw_writew(d, map->map_priv_1 + adr);
mb();
}
static void amd766rom_write32(struct map_info *map, __u32 d, unsigned long adr)
{
__raw_writel(d, map->map_priv_1 + adr);
mb();
}
static void amd766rom_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy_toio(map->map_priv_1 + to, from, len);
}
static struct amd766rom_map_info amd766rom_map = {
map: {
name: "AMD766 rom",
size: 0,
buswidth: 1,
read8: amd766rom_read8,
read16: amd766rom_read16,
read32: amd766rom_read32,
copy_from: amd766rom_copy_from,
write8: amd766rom_write8,
write16: amd766rom_write16,
write32: amd766rom_write32,
copy_to: amd766rom_copy_to,
/* The standard rom socket is for single power supply chips
* that don't have an extra vpp.
*/
},
mtd: 0,
window_addr: 0,
};
static int __devinit amd766rom_init_one (struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct rom_window {
u32 start;
u32 size;
u8 segen_bits;
};
static struct rom_window rom_window[] = {
{ 0xffb00000, 5*1024*1024, (1<<7) | (1<<6), },
{ 0xffc00000, 4*1024*1024, (1<<7), },
{ 0xffff0000, 64*1024, 0 },
{ 0 , 0, 0 },
};
static const u32 rom_probe_sizes[] = {
5*1024*1024, 4*1024*1024, 2*1024*1024, 1024*1024, 512*1024,
256*1024, 128*1024, 64*1024, 0};
static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", 0 };
u8 byte;
struct amd766rom_map_info *info = &amd766rom_map;
struct rom_window *window;
int i;
u32 rom_size;
window = &rom_window[0];
while(window->size) {
if (request_mem_region(window->start, window->size, "amd766rom")) {
break;
}
window++;
}
if (!window->size) {
printk(KERN_ERR "amd766rom: cannot reserve rom window");
goto err_out_none;
}
/* Enable the selected rom window */
pci_read_config_byte(pdev, 0x43, &byte);
pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
/* Enable writes through the rom window */
pci_read_config_byte(pdev, 0x40, &byte);
pci_write_config_byte(pdev, 0x40, byte | 1);
/* FIXME handle registers 0x80 - 0x8C the bios region locks */
printk(KERN_NOTICE "amd766rom window : %x at %x\n",
window->size, window->start);
/* For write accesses caches are useless */
info->window_addr = (unsigned long)ioremap_nocache(window->start, window->size);
if (!info->window_addr) {
printk(KERN_ERR "Failed to ioremap\n");
goto err_out_free_mmio_region;
}
info->mtd = 0;
for(i = 0; (rom_size = rom_probe_sizes[i]); i++) {
char **chip_type;
if (rom_size > window->size) {
continue;
}
info->map.map_priv_1 =
info->window_addr + window->size - rom_size;
info->map.size = rom_size;
chip_type = rom_probe_types;
for(; !info->mtd && *chip_type; chip_type++) {
info->mtd = do_map_probe(*chip_type, &amd766rom_map.map);
}
if (info->mtd) {
break;
}
}
if (!info->mtd) {
goto err_out_iounmap;
}
printk(KERN_NOTICE "amd766rom chip at offset: %x\n",
window->size - rom_size);
info->mtd->module = THIS_MODULE;
add_mtd_device(info->mtd);
info->window_start = window->start;
info->window_size = window->size;
return 0;
err_out_iounmap:
iounmap((void *)(info->window_addr));
err_out_free_mmio_region:
release_mem_region(window->start, window->size);
err_out_none:
return -ENODEV;
}
static void __devexit amd766rom_remove_one (struct pci_dev *pdev)
{
struct amd766rom_map_info *info = &amd766rom_map;
u8 byte;
del_mtd_device(info->mtd);
map_destroy(info->mtd);
info->mtd = 0;
info->map.map_priv_1 = 0;
iounmap((void *)(info->window_addr));
info->window_addr = 0;
/* Disable writes through the rom window */
pci_read_config_byte(pdev, 0x40, &byte);
pci_write_config_byte(pdev, 0x40, byte & ~1);
release_mem_region(info->window_start, info->window_size);
}
static struct pci_device_id amd766rom_pci_tbl[] __devinitdata = {
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
PCI_ANY_ID, PCI_ANY_ID, },
};
MODULE_DEVICE_TABLE(pci, amd766rom_pci_tbl);
#if 0
static struct pci_driver amd766rom_driver = {
name: "amd766rom",
id_table: amd766rom_pci_tbl,
probe: amd766rom_init_one,
remove: amd766rom_remove_one,
};
#endif
int __init init_amd766rom(void)
{
struct pci_dev *pdev;
pdev = pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410, 0);
if (pdev) {
amd766rom_map.pdev = pdev;
return amd766rom_init_one(pdev, &amd766rom_pci_tbl[0]);
}
return -ENXIO;
#if 0
return pci_module_init(&amd766rom_driver);
#endif
}
static void __exit cleanup_amd766rom(void)
{
amd766rom_remove_one(amd766rom_map.pdev);
}
module_init(init_amd766rom);
module_exit(cleanup_amd766rom);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD766 southbridge");
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