Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * tsunami_flash.c | |
3 | * | |
4 | * flash chip on alpha ds10... | |
1da177e4 LT |
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( | |
69f34c98 | 43 | struct map_info *map, unsigned long offset, |
1da177e4 LT |
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, | |
70e51015 | 64 | .phys = NO_XIP, |
1da177e4 LT |
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) { | |
ee0e87b1 | 79 | mtd_device_unregister(mtd); |
1da177e4 LT |
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); | |
69f34c98 | 92 | |
1da177e4 LT |
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; | |
ee0e87b1 | 100 | mtd_device_register(tsunami_flash_mtd, NULL, 0); |
1da177e4 LT |
101 | return 0; |
102 | } | |
103 | return -ENXIO; | |
104 | } | |
105 | ||
106 | module_init(init_tsunami_flash); | |
107 | module_exit(cleanup_tsunami_flash); |