1/* 2 * tsunami_flash.c 3 * 4 * flash chip on alpha ds10... 5 * $Id: tsunami_flash.c,v 1.1.1.1 2008/10/15 03:26:35 james26_jang Exp $ 6 */ 7#include <asm/io.h> 8#include <asm/core_tsunami.h> 9#include <linux/mtd/map.h> 10 11#define FLASH_ENABLE_PORT 0x00C00001 12#define FLASH_ENABLE_BYTE 0x01 13#define FLASH_DISABLE_BYTE 0x00 14 15#define MAX_TIG_FLASH_SIZE (12*1024*1024) 16static inline __u8 tsunami_flash_read8(struct map_info *map, unsigned long offset) 17{ 18 return tsunami_tig_readb(offset); 19} 20 21static void tsunami_flash_write8(struct map_info *map, __u8 value, unsigned long offset) 22{ 23 tsunami_tig_writeb(value, offset); 24} 25 26static void tsunami_flash_copy_from( 27 struct map_info *map, void *addr, unsigned long offset, ssize_t len) 28{ 29 unsigned char *dest; 30 dest = addr; 31 while(len && (offset < MAX_TIG_FLASH_SIZE)) { 32 *dest = tsunami_tig_readb(offset); 33 offset++; 34 dest++; 35 len--; 36 } 37} 38 39static void tsunami_flash_copy_to( 40 struct map_info *map, unsigned long offset, 41 const void *addr, ssize_t len) 42{ 43 const unsigned char *src; 44 src = addr; 45 while(len && (offset < MAX_TIG_FLASH_SIZE)) { 46 tsunami_tig_writeb(*src, offset); 47 offset++; 48 src++; 49 len--; 50 } 51} 52 53/* 54 * Deliberately don't provide operations wider than 8 bits. I don't 55 * have then and it scares me to think how you could mess up if 56 * you tried to use them. Buswidth is correctly so I'm safe. 57 */ 58static struct map_info tsunami_flash_map = { 59 .name = "flash chip on the Tsunami TIG bus", 60 .size = MAX_TIG_FLASH_SIZE, 61 .buswidth = 1, 62 .read8 = tsunami_flash_read8, 63 .read16 = 0, 64 .read32 = 0, 65 .copy_from = tsunami_flash_copy_from, 66 .write8 = tsunami_flash_write8, 67 .write16 = 0, 68 .write32 = 0, 69 .copy_to = tsunami_flash_copy_to, 70 .set_vpp = 0, 71 .map_priv_1 = 0, 72 73}; 74 75static struct mtd_info *tsunami_flash_mtd; 76 77static void __exit cleanup_tsunami_flash(void) 78{ 79 struct mtd_info *mtd; 80 mtd = tsunami_flash_mtd; 81 if (mtd) { 82 del_mtd_device(mtd); 83 map_destroy(mtd); 84 } 85 tsunami_flash_mtd = 0; 86} 87 88 89static int __init init_tsunami_flash(void) 90{ 91 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", 0 }; 92 char **type; 93 94 tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT); 95 96 tsunami_flash_mtd = 0; 97 type = rom_probe_types; 98 for(; !tsunami_flash_mtd && *type; type++) { 99 tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map); 100 } 101 if (tsunami_flash_mtd) { 102 tsunami_flash_mtd->module = THIS_MODULE; 103 add_mtd_device(tsunami_flash_mtd); 104 return 0; 105 } 106 return -ENXIO; 107} 108 109module_init(init_tsunami_flash); 110module_exit(cleanup_tsunami_flash); 111