/* * tsunami_flash.c * * flash chip on alpha ds10... * $Id: tsunami_flash.c,v 1.10 2005/11/07 11:14:29 gleixner Exp $ */ #include <asm/io.h> #include <asm/core_tsunami.h> #include <linux/init.h> #include <linux/mtd/map.h> #include <linux/mtd/mtd.h> #define FLASH_ENABLE_PORT 0x00C00001 #define FLASH_ENABLE_BYTE 0x01 #define FLASH_DISABLE_BYTE 0x00 #define MAX_TIG_FLASH_SIZE (12*1024*1024) static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset) { map_word val; val.x[0] = tsunami_tig_readb(offset); return val; } static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset) { tsunami_tig_writeb(value.x[0], offset); } static void tsunami_flash_copy_from( struct map_info *map, void *addr, unsigned long offset, ssize_t len) { unsigned char *dest; dest = addr; while(len && (offset < MAX_TIG_FLASH_SIZE)) { *dest = tsunami_tig_readb(offset); offset++; dest++; len--; } } static void tsunami_flash_copy_to( struct map_info *map, unsigned long offset, const void *addr, ssize_t len) { const unsigned char *src; src = addr; while(len && (offset < MAX_TIG_FLASH_SIZE)) { tsunami_tig_writeb(*src, offset); offset++; src++; len--; } } /* * Deliberately don't provide operations wider than 8 bits. I don't * have then and it scares me to think how you could mess up if * you tried to use them. Buswidth is correctly so I'm safe. */ static struct map_info tsunami_flash_map = { .name = "flash chip on the Tsunami TIG bus", .size = MAX_TIG_FLASH_SIZE, .phys = NO_XIP, .bankwidth = 1, .read = tsunami_flash_read8, .copy_from = tsunami_flash_copy_from, .write = tsunami_flash_write8, .copy_to = tsunami_flash_copy_to, }; static struct mtd_info *tsunami_flash_mtd; static void __exit cleanup_tsunami_flash(void) { struct mtd_info *mtd; mtd = tsunami_flash_mtd; if (mtd) { del_mtd_device(mtd); map_destroy(mtd); } tsunami_flash_mtd = 0; } static int __init init_tsunami_flash(void) { static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL }; char **type; tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT); tsunami_flash_mtd = 0; type = rom_probe_types; for(; !tsunami_flash_mtd && *type; type++) { tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map); } if (tsunami_flash_mtd) { tsunami_flash_mtd->owner = THIS_MODULE; add_mtd_device(tsunami_flash_mtd); return 0; } return -ENXIO; } module_init(init_tsunami_flash); module_exit(cleanup_tsunami_flash);