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/*
* Handle mapping of the flash memory access routines on the SBC8240 board.
*
* Carolyn Smith, Tektronix, Inc.
*
* This code is GPLed
*
* $Id: sbc8240.c,v 1.4 2004/07/12 22:38:29 dwmw2 Exp $
*
*/
/*
* The SBC8240 has 2 flash banks.
* Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
* It contains the U-Boot code (7 sectors) and the environment (1 sector).
* Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
* 2 x 8 KiB sectors, 1 x 16 KiB sectors.
* Both parts are JEDEC compatible.
*/
#include <linux/config.h>
#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/mtd/cfi.h>
#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif
#define DEBUG
#ifdef DEBUG
# define debugk(fmt,args...) printk(fmt ,##args)
#else
# define debugk(fmt,args...)
#endif
#define WINDOW_ADDR0 0xFFF00000 /* 512 KiB */
#define WINDOW_SIZE0 0x00080000
#define BUSWIDTH0 1
#define WINDOW_ADDR1 0xFF000000 /* 4 MiB */
#define WINDOW_SIZE1 0x00400000
#define BUSWIDTH1 8
#define MSG_PREFIX "sbc8240:" /* prefix for our printk()'s */
#define MTDID "sbc8240-%d" /* for mtdparts= partitioning */
static struct map_info sbc8240_map[2] = {
{
.name = "sbc8240 Flash Bank #0",
.size = WINDOW_SIZE0,
.bankwidth = BUSWIDTH0,
},
{
.name = "sbc8240 Flash Bank #1",
.size = WINDOW_SIZE1,
.bankwidth = BUSWIDTH1,
}
};
#define NUM_FLASH_BANKS (sizeof(sbc8240_map) / sizeof(struct map_info))
/*
* The following defines the partition layout of SBC8240 boards.
*
* See include/linux/mtd/partitions.h for definition of the
* mtd_partition structure.
*
* The *_max_flash_size is the maximum possible mapped flash size
* which is not necessarily the actual flash size. It must correspond
* to the value specified in the mapping definition defined by the
* "struct map_desc *_io_desc" for the corresponding machine.
*/
#ifdef CONFIG_MTD_PARTITIONS
static struct mtd_partition sbc8240_uboot_partitions [] = {
/* Bank 0 */
{
.name = "U-boot", /* U-Boot Firmware */
.offset = 0,
.size = 0x00070000, /* 7 x 64 KiB sectors */
.mask_flags = MTD_WRITEABLE, /* force read-only */
},
{
.name = "environment", /* U-Boot environment */
.offset = 0x00070000,
.size = 0x00010000, /* 1 x 64 KiB sector */
},
};
static struct mtd_partition sbc8240_fs_partitions [] = {
{
.name = "jffs", /* JFFS filesystem */
.offset = 0,
.size = 0x003C0000, /* 4 * 15 * 64KiB */
},
{
.name = "tmp32",
.offset = 0x003C0000,
.size = 0x00020000, /* 4 * 32KiB */
},
{
.name = "tmp8a",
.offset = 0x003E0000,
.size = 0x00008000, /* 4 * 8KiB */
},
{
.name = "tmp8b",
.offset = 0x003E8000,
.size = 0x00008000, /* 4 * 8KiB */
},
{
.name = "tmp16",
.offset = 0x003F0000,
.size = 0x00010000, /* 4 * 16KiB */
}
};
#define NB_OF(x) (sizeof (x) / sizeof (x[0]))
/* trivial struct to describe partition information */
struct mtd_part_def
{
int nums;
unsigned char *type;
struct mtd_partition* mtd_part;
};
static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
#endif /* CONFIG_MTD_PARTITIONS */
int __init init_sbc8240_mtd (void)
{
static struct _cjs {
u_long addr;
u_long size;
} pt[NUM_FLASH_BANKS] = {
{
.addr = WINDOW_ADDR0,
.size = WINDOW_SIZE0
},
{
.addr = WINDOW_ADDR1,
.size = WINDOW_SIZE1
},
};
int devicesfound = 0;
int i;
for (i = 0; i < NUM_FLASH_BANKS; i++) {
printk (KERN_NOTICE MSG_PREFIX
"Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
sbc8240_map[i].map_priv_1 =
(unsigned long) ioremap (pt[i].addr, pt[i].size);
if (!sbc8240_map[i].map_priv_1) {
printk (MSG_PREFIX "failed to ioremap\n");
return -EIO;
}
simple_map_init(&sbc8240_mtd[i]);
sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
if (sbc8240_mtd[i]) {
sbc8240_mtd[i]->module = THIS_MODULE;
devicesfound++;
}
}
if (!devicesfound) {
printk(KERN_NOTICE MSG_PREFIX
"No suppported flash chips found!\n");
return -ENXIO;
}
#ifdef CONFIG_MTD_PARTITIONS
sbc8240_part_banks[0].mtd_part = sbc8240_uboot_partitions;
sbc8240_part_banks[0].type = "static image";
sbc8240_part_banks[0].nums = NB_OF(sbc8240_uboot_partitions);
sbc8240_part_banks[1].mtd_part = sbc8240_fs_partitions;
sbc8240_part_banks[1].type = "static file system";
sbc8240_part_banks[1].nums = NB_OF(sbc8240_fs_partitions);
for (i = 0; i < NUM_FLASH_BANKS; i++) {
if (!sbc8240_mtd[i]) continue;
if (sbc8240_part_banks[i].nums == 0) {
printk (KERN_NOTICE MSG_PREFIX
"No partition info available, registering whole device\n");
add_mtd_device(sbc8240_mtd[i]);
} else {
printk (KERN_NOTICE MSG_PREFIX
"Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
add_mtd_partitions (sbc8240_mtd[i],
sbc8240_part_banks[i].mtd_part,
sbc8240_part_banks[i].nums);
}
}
#else
printk(KERN_NOTICE MSG_PREFIX
"Registering %d flash banks at once\n", devicesfound);
for (i = 0; i < devicesfound; i++) {
add_mtd_device(sbc8240_mtd[i]);
}
#endif /* CONFIG_MTD_PARTITIONS */
return devicesfound == 0 ? -ENXIO : 0;
}
static void __exit cleanup_sbc8240_mtd (void)
{
int i;
for (i = 0; i < NUM_FLASH_BANKS; i++) {
if (sbc8240_mtd[i]) {
del_mtd_device (sbc8240_mtd[i]);
map_destroy (sbc8240_mtd[i]);
}
if (sbc8240_map[i].map_priv_1) {
iounmap ((void *) sbc8240_map[i].map_priv_1);
sbc8240_map[i].map_priv_1 = 0;
}
}
}
module_init (init_sbc8240_mtd);
module_exit (cleanup_sbc8240_mtd);
MODULE_LICENSE ("GPL");
MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
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