mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 12:16:39 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
227 lines
6.1 KiB
C
227 lines
6.1 KiB
C
/*
|
|
* Flash memory access on Alchemy Db1xxx boards
|
|
*
|
|
* $Id: db1x00-flash.c,v 1.6 2004/11/04 13:24:14 gleixner Exp $
|
|
*
|
|
* (C) 2003 Pete Popov <ppopov@embeddedalley.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
#ifdef DEBUG_RW
|
|
#define DBG(x...) printk(x)
|
|
#else
|
|
#define DBG(x...)
|
|
#endif
|
|
|
|
/* MTD CONFIG OPTIONS */
|
|
#if defined(CONFIG_MTD_DB1X00_BOOT) && defined(CONFIG_MTD_DB1X00_USER)
|
|
#define DB1X00_BOTH_BANKS
|
|
#elif defined(CONFIG_MTD_DB1X00_BOOT) && !defined(CONFIG_MTD_DB1X00_USER)
|
|
#define DB1X00_BOOT_ONLY
|
|
#elif !defined(CONFIG_MTD_DB1X00_BOOT) && defined(CONFIG_MTD_DB1X00_USER)
|
|
#define DB1X00_USER_ONLY
|
|
#endif
|
|
|
|
static unsigned long window_addr;
|
|
static unsigned long window_size;
|
|
static unsigned long flash_size;
|
|
|
|
static unsigned short *bcsr = (unsigned short *)0xAE000000;
|
|
static unsigned char flash_bankwidth = 4;
|
|
|
|
/*
|
|
* The Db1x boards support different flash densities. We setup
|
|
* the mtd_partition structures below for default of 64Mbit
|
|
* flash densities, and override the partitions sizes, if
|
|
* necessary, after we check the board status register.
|
|
*/
|
|
|
|
#ifdef DB1X00_BOTH_BANKS
|
|
/* both banks will be used. Combine the first bank and the first
|
|
* part of the second bank together into a single jffs/jffs2
|
|
* partition.
|
|
*/
|
|
static struct mtd_partition db1x00_partitions[] = {
|
|
{
|
|
.name = "User FS",
|
|
.size = 0x1c00000,
|
|
.offset = 0x0000000
|
|
},{
|
|
.name = "yamon",
|
|
.size = 0x0100000,
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.mask_flags = MTD_WRITEABLE
|
|
},{
|
|
.name = "raw kernel",
|
|
.size = (0x300000-0x40000), /* last 256KB is env */
|
|
.offset = MTDPART_OFS_APPEND,
|
|
}
|
|
};
|
|
#elif defined(DB1X00_BOOT_ONLY)
|
|
static struct mtd_partition db1x00_partitions[] = {
|
|
{
|
|
.name = "User FS",
|
|
.size = 0x00c00000,
|
|
.offset = 0x0000000
|
|
},{
|
|
.name = "yamon",
|
|
.size = 0x0100000,
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.mask_flags = MTD_WRITEABLE
|
|
},{
|
|
.name = "raw kernel",
|
|
.size = (0x300000-0x40000), /* last 256KB is env */
|
|
.offset = MTDPART_OFS_APPEND,
|
|
}
|
|
};
|
|
#elif defined(DB1X00_USER_ONLY)
|
|
static struct mtd_partition db1x00_partitions[] = {
|
|
{
|
|
.name = "User FS",
|
|
.size = 0x0e00000,
|
|
.offset = 0x0000000
|
|
},{
|
|
.name = "raw kernel",
|
|
.size = MTDPART_SIZ_FULL,
|
|
.offset = MTDPART_OFS_APPEND,
|
|
}
|
|
};
|
|
#else
|
|
#error MTD_DB1X00 define combo error /* should never happen */
|
|
#endif
|
|
#define NB_OF(x) (sizeof(x)/sizeof(x[0]))
|
|
|
|
#define NAME "Db1x00 Linux Flash"
|
|
|
|
static struct map_info db1xxx_mtd_map = {
|
|
.name = NAME,
|
|
};
|
|
|
|
static struct mtd_partition *parsed_parts;
|
|
static struct mtd_info *db1xxx_mtd;
|
|
|
|
/*
|
|
* Probe the flash density and setup window address and size
|
|
* based on user CONFIG options. There are times when we don't
|
|
* want the MTD driver to be probing the boot or user flash,
|
|
* so having the option to enable only one bank is important.
|
|
*/
|
|
int setup_flash_params(void)
|
|
{
|
|
switch ((bcsr[2] >> 14) & 0x3) {
|
|
case 0: /* 64Mbit devices */
|
|
flash_size = 0x800000; /* 8MB per part */
|
|
#if defined(DB1X00_BOTH_BANKS)
|
|
window_addr = 0x1E000000;
|
|
window_size = 0x2000000;
|
|
#elif defined(DB1X00_BOOT_ONLY)
|
|
window_addr = 0x1F000000;
|
|
window_size = 0x1000000;
|
|
#else /* USER ONLY */
|
|
window_addr = 0x1E000000;
|
|
window_size = 0x1000000;
|
|
#endif
|
|
break;
|
|
case 1:
|
|
/* 128 Mbit devices */
|
|
flash_size = 0x1000000; /* 16MB per part */
|
|
#if defined(DB1X00_BOTH_BANKS)
|
|
window_addr = 0x1C000000;
|
|
window_size = 0x4000000;
|
|
/* USERFS from 0x1C00 0000 to 0x1FC0 0000 */
|
|
db1x00_partitions[0].size = 0x3C00000;
|
|
#elif defined(DB1X00_BOOT_ONLY)
|
|
window_addr = 0x1E000000;
|
|
window_size = 0x2000000;
|
|
/* USERFS from 0x1E00 0000 to 0x1FC0 0000 */
|
|
db1x00_partitions[0].size = 0x1C00000;
|
|
#else /* USER ONLY */
|
|
window_addr = 0x1C000000;
|
|
window_size = 0x2000000;
|
|
/* USERFS from 0x1C00 0000 to 0x1DE00000 */
|
|
db1x00_partitions[0].size = 0x1DE0000;
|
|
#endif
|
|
break;
|
|
case 2:
|
|
/* 256 Mbit devices */
|
|
flash_size = 0x4000000; /* 64MB per part */
|
|
#if defined(DB1X00_BOTH_BANKS)
|
|
return 1;
|
|
#elif defined(DB1X00_BOOT_ONLY)
|
|
/* Boot ROM flash bank only; no user bank */
|
|
window_addr = 0x1C000000;
|
|
window_size = 0x4000000;
|
|
/* USERFS from 0x1C00 0000 to 0x1FC00000 */
|
|
db1x00_partitions[0].size = 0x3C00000;
|
|
#else /* USER ONLY */
|
|
return 1;
|
|
#endif
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
db1xxx_mtd_map.size = window_size;
|
|
db1xxx_mtd_map.bankwidth = flash_bankwidth;
|
|
db1xxx_mtd_map.phys = window_addr;
|
|
db1xxx_mtd_map.bankwidth = flash_bankwidth;
|
|
return 0;
|
|
}
|
|
|
|
int __init db1x00_mtd_init(void)
|
|
{
|
|
struct mtd_partition *parts;
|
|
int nb_parts = 0;
|
|
|
|
if (setup_flash_params())
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* Static partition definition selection
|
|
*/
|
|
parts = db1x00_partitions;
|
|
nb_parts = NB_OF(db1x00_partitions);
|
|
|
|
/*
|
|
* Now let's probe for the actual flash. Do it here since
|
|
* specific machine settings might have been set above.
|
|
*/
|
|
printk(KERN_NOTICE "Db1xxx flash: probing %d-bit flash bus\n",
|
|
db1xxx_mtd_map.bankwidth*8);
|
|
db1xxx_mtd_map.virt = ioremap(window_addr, window_size);
|
|
db1xxx_mtd = do_map_probe("cfi_probe", &db1xxx_mtd_map);
|
|
if (!db1xxx_mtd) return -ENXIO;
|
|
db1xxx_mtd->owner = THIS_MODULE;
|
|
|
|
add_mtd_partitions(db1xxx_mtd, parts, nb_parts);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit db1x00_mtd_cleanup(void)
|
|
{
|
|
if (db1xxx_mtd) {
|
|
del_mtd_partitions(db1xxx_mtd);
|
|
map_destroy(db1xxx_mtd);
|
|
if (parsed_parts)
|
|
kfree(parsed_parts);
|
|
}
|
|
}
|
|
|
|
module_init(db1x00_mtd_init);
|
|
module_exit(db1x00_mtd_cleanup);
|
|
|
|
MODULE_AUTHOR("Pete Popov");
|
|
MODULE_DESCRIPTION("Db1x00 mtd map driver");
|
|
MODULE_LICENSE("GPL");
|