4 * flash chip on alpha ds10...
5 * $Id: tsunami_flash.c,v 1.6 2003/05/21 15:15:08 dwmw2 Exp $
8 #include <asm/core_tsunami.h>
9 #include <linux/init.h>
10 #include <linux/mtd/map.h>
11 #include <linux/mtd/mtd.h>
13 #define FLASH_ENABLE_PORT 0x00C00001
14 #define FLASH_ENABLE_BYTE 0x01
15 #define FLASH_DISABLE_BYTE 0x00
17 #define MAX_TIG_FLASH_SIZE (12*1024*1024)
18 static inline __u8 tsunami_flash_read8(struct map_info *map, unsigned long offset)
20 return tsunami_tig_readb(offset);
23 static void tsunami_flash_write8(struct map_info *map, __u8 value, unsigned long offset)
25 tsunami_tig_writeb(value, offset);
28 static void tsunami_flash_copy_from(
29 struct map_info *map, void *addr, unsigned long offset, ssize_t len)
33 while(len && (offset < MAX_TIG_FLASH_SIZE)) {
34 *dest = tsunami_tig_readb(offset);
41 static void tsunami_flash_copy_to(
42 struct map_info *map, unsigned long offset,
43 const void *addr, ssize_t len)
45 const unsigned char *src;
47 while(len && (offset < MAX_TIG_FLASH_SIZE)) {
48 tsunami_tig_writeb(*src, offset);
56 * Deliberately don't provide operations wider than 8 bits. I don't
57 * have then and it scares me to think how you could mess up if
58 * you tried to use them. Buswidth is correctly so I'm safe.
60 static struct map_info tsunami_flash_map = {
61 .name = "flash chip on the Tsunami TIG bus",
62 .size = MAX_TIG_FLASH_SIZE,
65 .read8 = tsunami_flash_read8,
66 .copy_from = tsunami_flash_copy_from,
67 .write8 = tsunami_flash_write8,
68 .copy_to = tsunami_flash_copy_to,
71 static struct mtd_info *tsunami_flash_mtd;
73 static void __exit cleanup_tsunami_flash(void)
76 mtd = tsunami_flash_mtd;
81 tsunami_flash_mtd = 0;
85 static int __init init_tsunami_flash(void)
87 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", 0 };
90 tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);
92 tsunami_flash_mtd = 0;
93 type = rom_probe_types;
94 for(; !tsunami_flash_mtd && *type; type++) {
95 tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
97 if (tsunami_flash_mtd) {
98 tsunami_flash_mtd->owner = THIS_MODULE;
99 add_mtd_device(tsunami_flash_mtd);
105 module_init(init_tsunami_flash);
106 module_exit(cleanup_tsunami_flash);