Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / drivers / mtd / maps / tsunami_flash.c
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);