s3c2410.c

基于s3c2410的nandflash 和norflash的驱动开发

#ifdef CONFIG_MTD_PARTITIONS
#include
#endif 

#define WINDOW_ADDR 0x01000000      /* physical properties of flash */
#define WINDOW_SIZE 0x800000
#define BUSWIDTH    2
#define FLASH_BLOCKSIZE_MAIN0x20000
#define FLASH_NUMBLOCKS_MAIN128
/* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
#define PROBETYPES { "cfi_probe", NULL }

#define MSG_PREFIX "S3C2410-NOR:"   /* prefix for our printk()'s */
#define MTDID      "s3c2410-nor"    /* for mtdparts= partitioning */

static struct mtd_info *mymtd;

struct map_info s3c2410nor_map = {
.name = "NOR flash on S3C2410",
.size = WINDOW_SIZE,
.bankwidth = BUSWIDTH,
.phys = WINDOW_ADDR,
};

#ifdef CONFIG_MTD_PARTITIONS

/*
* MTD partitioning stuff 
*/
static struct mtd_partition static_partitions[] =
{
{
.name = "BootLoader",
.size = 0x040000,
.offset = 0x0
},
{
.name = "Kernel",
.size = 0x0100000,
.offset = 0x40000
},
{
.name = "RamDisk",
.size = 0x400000,
.offset = 0x140000
},
{
.name = "cramfs(2MB)",
.size = 0x200000,
.offset = 0x540000
},
{
.name = "jffs2(0.75MB)",
.size = 0xc0000,
.offset = 0x740000
},
};

//static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
static const char *probes[] = { NULL };

#endif

static int                   mtd_parts_nb = 0;
static struct mtd_partition *mtd_parts    = 0;

int __init init_s3c2410nor(void)
{
static const char *rom_probe_types[] = PROBETYPES;
const char **type;
const char *part_type = 0;

      printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n", 
      WINDOW_SIZE, WINDOW_ADDR);
s3c2410nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);

if (!s3c2410nor_map.virt) {
printk(MSG_PREFIX "failed to ioremap\n");
return -EIO;
}

simple_map_init(&s3c2410nor_map);

mymtd = 0;
type = rom_probe_types;
for(; !mymtd && *type; type++) {
mymtd = do_map_probe(*type, &s3c2410nor_map);
}
if (mymtd) {
mymtd->owner = THIS_MODULE;

#ifdef CONFIG_MTD_PARTITIONS
mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
if (mtd_parts_nb > 0)
 part_type = "detected";

if (mtd_parts_nb == 0)
{
mtd_parts = static_partitions;
mtd_parts_nb = ARRAY_SIZE(static_partitions);
part_type = "static";
}
#endif
add_mtd_device(mymtd);
if (mtd_parts_nb == 0)
 printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
else
{
printk(KERN_NOTICE MSG_PREFIX
      "using %s partition definition\n", part_type);
add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
}
return 0;
}

iounmap((void *)s3c2410nor_map.virt);
return -ENXIO;
}

static void __exit cleanup_s3c2410nor(void)
{
if (mymtd) {
del_mtd_device(mymtd);
map_destroy(mymtd);
}
if (s3c2410nor_map.virt) {
iounmap((void *)s3c2410nor_map.virt);
s3c2410nor_map.virt = 0;
}
}

module_init(init_s3c2410nor);
module_exit(cleanup_s3c2410nor);
MODULE_DESCRIPTION("Generic configurable MTD map driver");