1 /* 2 * tsunami_flash.c 3 * 4 * flash chip on alpha ds10... 5 */ 6 #include <asm/io.h> 7 #include <asm/core_tsunami.h> 8 #include <linux/init.h> 9 #include <linux/mtd/map.h> 10 #include <linux/mtd/mtd.h> 11 12 #define FLASH_ENABLE_PORT 0x00C00001 13 #define FLASH_ENABLE_BYTE 0x01 14 #define FLASH_DISABLE_BYTE 0x00 15 16 #define MAX_TIG_FLASH_SIZE (12*1024*1024) 17 static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset) 18 { 19 map_word val; 20 val.x[0] = tsunami_tig_readb(offset); 21 return val; 22 } 23 24 static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset) 25 { 26 tsunami_tig_writeb(value.x[0], offset); 27 } 28 29 static void tsunami_flash_copy_from( 30 struct map_info *map, void *addr, unsigned long offset, ssize_t len) 31 { 32 unsigned char *dest; 33 dest = addr; 34 while(len && (offset < MAX_TIG_FLASH_SIZE)) { 35 *dest = tsunami_tig_readb(offset); 36 offset++; 37 dest++; 38 len--; 39 } 40 } 41 42 static void tsunami_flash_copy_to( 43 struct map_info *map, unsigned long offset, 44 const void *addr, ssize_t len) 45 { 46 const unsigned char *src; 47 src = addr; 48 while(len && (offset < MAX_TIG_FLASH_SIZE)) { 49 tsunami_tig_writeb(*src, offset); 50 offset++; 51 src++; 52 len--; 53 } 54 } 55 56 /* 57 * Deliberately don't provide operations wider than 8 bits. I don't 58 * have then and it scares me to think how you could mess up if 59 * you tried to use them. Buswidth is correctly so I'm safe. 60 */ 61 static struct map_info tsunami_flash_map = { 62 .name = "flash chip on the Tsunami TIG bus", 63 .size = MAX_TIG_FLASH_SIZE, 64 .phys = NO_XIP, 65 .bankwidth = 1, 66 .read = tsunami_flash_read8, 67 .copy_from = tsunami_flash_copy_from, 68 .write = tsunami_flash_write8, 69 .copy_to = tsunami_flash_copy_to, 70 }; 71 72 static struct mtd_info *tsunami_flash_mtd; 73 74 static void __exit cleanup_tsunami_flash(void) 75 { 76 struct mtd_info *mtd; 77 mtd = tsunami_flash_mtd; 78 if (mtd) { 79 del_mtd_device(mtd); 80 map_destroy(mtd); 81 } 82 tsunami_flash_mtd = 0; 83 } 84 85 86 static int __init init_tsunami_flash(void) 87 { 88 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL }; 89 char **type; 90 91 tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT); 92 93 tsunami_flash_mtd = 0; 94 type = rom_probe_types; 95 for(; !tsunami_flash_mtd && *type; type++) { 96 tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map); 97 } 98 if (tsunami_flash_mtd) { 99 tsunami_flash_mtd->owner = THIS_MODULE; 100 add_mtd_device(tsunami_flash_mtd); 101 return 0; 102 } 103 return -ENXIO; 104 } 105 106 module_init(init_tsunami_flash); 107 module_exit(cleanup_tsunami_flash); 108