diff options
Diffstat (limited to 'drivers/mtd/maps/db1550-flash.c')
| -rw-r--r-- | drivers/mtd/maps/db1550-flash.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/mtd/maps/db1550-flash.c b/drivers/mtd/maps/db1550-flash.c new file mode 100644 index 0000000..d213888 --- /dev/null +++ b/drivers/mtd/maps/db1550-flash.c @@ -0,0 +1,187 @@ +/* + * Flash memory access on Alchemy Db1550 board + * + * $Id: db1550-flash.c,v 1.7 2004/11/04 13:24:14 gleixner Exp $ + * + * (C) 2004 Embedded Edge, LLC, based on db1550-flash.c: + * (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com> + * + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/types.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 + +static unsigned long window_addr; +static unsigned long window_size; + + +static struct map_info db1550_map = { + .name = "Db1550 flash", +}; + +static unsigned char flash_bankwidth = 4; + +/* + * Support only 64MB NOR Flash parts + */ + +#if defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER) +#define DB1550_BOTH_BANKS +#elif defined(CONFIG_MTD_DB1550_BOOT) && !defined(CONFIG_MTD_DB1550_USER) +#define DB1550_BOOT_ONLY +#elif !defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER) +#define DB1550_USER_ONLY +#endif + +#ifdef DB1550_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 db1550_partitions[] = { + /* assume boot[2:0]:swap is '0000' or '1000', which translates to: + * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash + * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash + */ + { + .name = "User FS", + .size = (0x1FC00000 - 0x18000000), + .offset = 0x0000000 + },{ + .name = "yamon", + .size = 0x0100000, + .offset = MTDPART_OFS_APPEND, + .mask_flags = MTD_WRITEABLE + },{ + .name = "raw kernel", + .size = (0x300000 - 0x40000), /* last 256KB is yamon env */ + .offset = MTDPART_OFS_APPEND, + } +}; +#elif defined(DB1550_BOOT_ONLY) +static struct mtd_partition db1550_partitions[] = { + /* assume boot[2:0]:swap is '0000' or '1000', which translates to: + * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash + */ + { + .name = "User FS", + .size = 0x03c00000, + .offset = 0x0000000 + },{ + .name = "yamon", + .size = 0x0100000, + .offset = MTDPART_OFS_APPEND, + .mask_flags = MTD_WRITEABLE + },{ + .name = "raw kernel", + .size = (0x300000-0x40000), /* last 256KB is yamon env */ + .offset = MTDPART_OFS_APPEND, + } +}; +#elif defined(DB1550_USER_ONLY) +static struct mtd_partition db1550_partitions[] = { + /* assume boot[2:0]:swap is '0000' or '1000', which translates to: + * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash + */ + { + .name = "User FS", + .size = (0x4000000 - 0x200000), /* reserve 2MB for raw kernel */ + .offset = 0x0000000 + },{ + .name = "raw kernel", + .size = MTDPART_SIZ_FULL, + .offset = MTDPART_OFS_APPEND, + } +}; +#else +#error MTD_DB1550 define combo error /* should never happen */ +#endif + +#define NB_OF(x) (sizeof(x)/sizeof(x[0])) + +static struct mtd_info *mymtd; + +/* + * 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) +{ +#if defined(DB1550_BOTH_BANKS) + window_addr = 0x18000000; + window_size = 0x8000000; +#elif defined(DB1550_BOOT_ONLY) + window_addr = 0x1C000000; + window_size = 0x4000000; +#else /* USER ONLY */ + window_addr = 0x18000000; + window_size = 0x4000000; +#endif + return 0; +} + +int __init db1550_mtd_init(void) +{ + struct mtd_partition *parts; + int nb_parts = 0; + + /* Default flash bankwidth */ + db1550_map.bankwidth = flash_bankwidth; + + if (setup_flash_params()) + return -ENXIO; + + /* + * Static partition definition selection + */ + parts = db1550_partitions; + nb_parts = NB_OF(db1550_partitions); + db1550_map.size = window_size; + + /* + * Now let's probe for the actual flash. Do it here since + * specific machine settings might have been set above. + */ + printk(KERN_NOTICE "Db1550 flash: probing %d-bit flash bus\n", + db1550_map.bankwidth*8); + db1550_map.virt = ioremap(window_addr, window_size); + mymtd = do_map_probe("cfi_probe", &db1550_map); + if (!mymtd) return -ENXIO; + mymtd->owner = THIS_MODULE; + + add_mtd_partitions(mymtd, parts, nb_parts); + return 0; +} + +static void __exit db1550_mtd_cleanup(void) +{ + if (mymtd) { + del_mtd_partitions(mymtd); + map_destroy(mymtd); + iounmap((void *) db1550_map.virt); + } +} + +module_init(db1550_mtd_init); +module_exit(db1550_mtd_cleanup); + +MODULE_AUTHOR("Embedded Edge, LLC"); +MODULE_DESCRIPTION("Db1550 mtd map driver"); +MODULE_LICENSE("GPL"); |