diff options
Diffstat (limited to 'drivers/mtd/maps/walnut.c')
-rw-r--r-- | drivers/mtd/maps/walnut.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/mtd/maps/walnut.c b/drivers/mtd/maps/walnut.c new file mode 100644 index 000000000000..d6137b1b5670 --- /dev/null +++ b/drivers/mtd/maps/walnut.c | |||
@@ -0,0 +1,122 @@ | |||
1 | /* | ||
2 | * $Id: walnut.c,v 1.2 2004/12/10 12:07:42 holindho Exp $ | ||
3 | * | ||
4 | * Mapping for Walnut flash | ||
5 | * (used ebony.c as a "framework") | ||
6 | * | ||
7 | * Heikki Lindholm <holindho@infradead.org> | ||
8 | * | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or modify it | ||
11 | * under the terms of the GNU General Public License as published by the | ||
12 | * Free Software Foundation; either version 2 of the License, or (at your | ||
13 | * option) any later version. | ||
14 | */ | ||
15 | |||
16 | #include <linux/module.h> | ||
17 | #include <linux/types.h> | ||
18 | #include <linux/kernel.h> | ||
19 | #include <linux/init.h> | ||
20 | #include <linux/mtd/mtd.h> | ||
21 | #include <linux/mtd/map.h> | ||
22 | #include <linux/mtd/partitions.h> | ||
23 | #include <linux/config.h> | ||
24 | #include <linux/version.h> | ||
25 | #include <asm/io.h> | ||
26 | #include <asm/ibm4xx.h> | ||
27 | #include <platforms/4xx/walnut.h> | ||
28 | |||
29 | /* these should be in platforms/4xx/walnut.h ? */ | ||
30 | #define WALNUT_FLASH_ONBD_N(x) (x & 0x02) | ||
31 | #define WALNUT_FLASH_SRAM_SEL(x) (x & 0x01) | ||
32 | #define WALNUT_FLASH_LOW 0xFFF00000 | ||
33 | #define WALNUT_FLASH_HIGH 0xFFF80000 | ||
34 | #define WALNUT_FLASH_SIZE 0x80000 | ||
35 | |||
36 | static struct mtd_info *flash; | ||
37 | |||
38 | static struct map_info walnut_map = { | ||
39 | .name = "Walnut flash", | ||
40 | .size = WALNUT_FLASH_SIZE, | ||
41 | .bankwidth = 1, | ||
42 | }; | ||
43 | |||
44 | /* Actually, OpenBIOS is the last 128 KiB of the flash - better | ||
45 | * partitioning could be made */ | ||
46 | static struct mtd_partition walnut_partitions[] = { | ||
47 | { | ||
48 | .name = "OpenBIOS", | ||
49 | .offset = 0x0, | ||
50 | .size = WALNUT_FLASH_SIZE, | ||
51 | /*.mask_flags = MTD_WRITEABLE, */ /* force read-only */ | ||
52 | } | ||
53 | }; | ||
54 | |||
55 | int __init init_walnut(void) | ||
56 | { | ||
57 | u8 fpga_brds1; | ||
58 | void *fpga_brds1_adr; | ||
59 | void *fpga_status_adr; | ||
60 | unsigned long flash_base; | ||
61 | |||
62 | /* this should already be mapped (platform/4xx/walnut.c) */ | ||
63 | fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8); | ||
64 | if (!fpga_status_adr) | ||
65 | return -ENOMEM; | ||
66 | |||
67 | fpga_brds1_adr = fpga_status_adr+5; | ||
68 | fpga_brds1 = readb(fpga_brds1_adr); | ||
69 | /* iounmap(fpga_status_adr); */ | ||
70 | |||
71 | if (WALNUT_FLASH_ONBD_N(fpga_brds1)) { | ||
72 | printk("The on-board flash is disabled (U79 sw 5)!"); | ||
73 | return -EIO; | ||
74 | } | ||
75 | if (WALNUT_FLASH_SRAM_SEL(fpga_brds1)) | ||
76 | flash_base = WALNUT_FLASH_LOW; | ||
77 | else | ||
78 | flash_base = WALNUT_FLASH_HIGH; | ||
79 | |||
80 | walnut_map.phys = flash_base; | ||
81 | walnut_map.virt = | ||
82 | (void __iomem *)ioremap(flash_base, walnut_map.size); | ||
83 | |||
84 | if (!walnut_map.virt) { | ||
85 | printk("Failed to ioremap flash.\n"); | ||
86 | return -EIO; | ||
87 | } | ||
88 | |||
89 | simple_map_init(&walnut_map); | ||
90 | |||
91 | flash = do_map_probe("jedec_probe", &walnut_map); | ||
92 | if (flash) { | ||
93 | flash->owner = THIS_MODULE; | ||
94 | add_mtd_partitions(flash, walnut_partitions, | ||
95 | ARRAY_SIZE(walnut_partitions)); | ||
96 | } else { | ||
97 | printk("map probe failed for flash\n"); | ||
98 | return -ENXIO; | ||
99 | } | ||
100 | |||
101 | return 0; | ||
102 | } | ||
103 | |||
104 | static void __exit cleanup_walnut(void) | ||
105 | { | ||
106 | if (flash) { | ||
107 | del_mtd_partitions(flash); | ||
108 | map_destroy(flash); | ||
109 | } | ||
110 | |||
111 | if (walnut_map.virt) { | ||
112 | iounmap((void *)walnut_map.virt); | ||
113 | walnut_map.virt = 0; | ||
114 | } | ||
115 | } | ||
116 | |||
117 | module_init(init_walnut); | ||
118 | module_exit(cleanup_walnut); | ||
119 | |||
120 | MODULE_LICENSE("GPL"); | ||
121 | MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>"); | ||
122 | MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards"); | ||