diff options
Diffstat (limited to 'drivers/mtd/maps/db1x00-flash.c')
| -rw-r--r-- | drivers/mtd/maps/db1x00-flash.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/mtd/maps/db1x00-flash.c b/drivers/mtd/maps/db1x00-flash.c new file mode 100644 index 00000000000..faa68ec5690 --- /dev/null +++ b/drivers/mtd/maps/db1x00-flash.c @@ -0,0 +1,226 @@ +/* + * 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"); |