Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * tsunami_flash.c | |
3 | * | |
4 | * flash chip on alpha ds10... | |
69f34c98 | 5 | * $Id: tsunami_flash.c,v 1.10 2005/11/07 11:14:29 gleixner Exp $ |
1da177e4 LT |
6 | */ |
7 | #include <asm/io.h> | |
8 | #include <asm/core_tsunami.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/mtd/map.h> | |
11 | #include <linux/mtd/mtd.h> | |
12 | ||
13 | #define FLASH_ENABLE_PORT 0x00C00001 | |
14 | #define FLASH_ENABLE_BYTE 0x01 | |
15 | #define FLASH_DISABLE_BYTE 0x00 | |
16 | ||
17 | #define MAX_TIG_FLASH_SIZE (12*1024*1024) | |
18 | static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset) | |
19 | { | |
20 | map_word val; | |
21 | val.x[0] = tsunami_tig_readb(offset); | |
22 | return val; | |
23 | } | |
24 | ||
25 | static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset) | |
26 | { | |
27 | tsunami_tig_writeb(value.x[0], offset); | |
28 | } | |
29 | ||
30 | static void tsunami_flash_copy_from( | |
31 | struct map_info *map, void *addr, unsigned long offset, ssize_t len) | |
32 | { | |
33 | unsigned char *dest; | |
34 | dest = addr; | |
35 | while(len && (offset < MAX_TIG_FLASH_SIZE)) { | |
36 | *dest = tsunami_tig_readb(offset); | |
37 | offset++; | |
38 | dest++; | |
39 | len--; | |
40 | } | |
41 | } | |
42 | ||
43 | static void tsunami_flash_copy_to( | |
69f34c98 | 44 | struct map_info *map, unsigned long offset, |
1da177e4 LT |
45 | const void *addr, ssize_t len) |
46 | { | |
47 | const unsigned char *src; | |
48 | src = addr; | |
49 | while(len && (offset < MAX_TIG_FLASH_SIZE)) { | |
50 | tsunami_tig_writeb(*src, offset); | |
51 | offset++; | |
52 | src++; | |
53 | len--; | |
54 | } | |
55 | } | |
56 | ||
57 | /* | |
58 | * Deliberately don't provide operations wider than 8 bits. I don't | |
59 | * have then and it scares me to think how you could mess up if | |
60 | * you tried to use them. Buswidth is correctly so I'm safe. | |
61 | */ | |
62 | static struct map_info tsunami_flash_map = { | |
63 | .name = "flash chip on the Tsunami TIG bus", | |
64 | .size = MAX_TIG_FLASH_SIZE, | |
65 | .phys = NO_XIP; | |
66 | .bankwidth = 1, | |
67 | .read = tsunami_flash_read8, | |
68 | .copy_from = tsunami_flash_copy_from, | |
69 | .write = tsunami_flash_write8, | |
70 | .copy_to = tsunami_flash_copy_to, | |
71 | }; | |
72 | ||
73 | static struct mtd_info *tsunami_flash_mtd; | |
74 | ||
75 | static void __exit cleanup_tsunami_flash(void) | |
76 | { | |
77 | struct mtd_info *mtd; | |
78 | mtd = tsunami_flash_mtd; | |
79 | if (mtd) { | |
80 | del_mtd_device(mtd); | |
81 | map_destroy(mtd); | |
82 | } | |
83 | tsunami_flash_mtd = 0; | |
84 | } | |
85 | ||
86 | ||
87 | static int __init init_tsunami_flash(void) | |
88 | { | |
89 | static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL }; | |
90 | char **type; | |
91 | ||
92 | tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT); | |
69f34c98 | 93 | |
1da177e4 LT |
94 | tsunami_flash_mtd = 0; |
95 | type = rom_probe_types; | |
96 | for(; !tsunami_flash_mtd && *type; type++) { | |
97 | tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map); | |
98 | } | |
99 | if (tsunami_flash_mtd) { | |
100 | tsunami_flash_mtd->owner = THIS_MODULE; | |
101 | add_mtd_device(tsunami_flash_mtd); | |
102 | return 0; | |
103 | } | |
104 | return -ENXIO; | |
105 | } | |
106 | ||
107 | module_init(init_tsunami_flash); | |
108 | module_exit(cleanup_tsunami_flash); |