Commit | Line | Data |
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1da177e4 | 1 | /* |
69f34c98 | 2 | * NV-RAM memory access on autcpu12 |
1da177e4 LT |
3 | * (C) 2002 Thomas Gleixner (gleixner@autronix.de) |
4 | * | |
1da177e4 LT |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/init.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/sizes.h> | |
a09e64fb RK |
28 | #include <mach/hardware.h> |
29 | #include <mach/autcpu12.h> | |
1da177e4 LT |
30 | #include <linux/mtd/mtd.h> |
31 | #include <linux/mtd/map.h> | |
32 | #include <linux/mtd/partitions.h> | |
33 | ||
34 | ||
35 | static struct mtd_info *sram_mtd; | |
36 | ||
37 | struct map_info autcpu12_sram_map = { | |
38 | .name = "SRAM", | |
39 | .size = 32768, | |
40 | .bankwidth = 4, | |
41 | .phys = 0x12000000, | |
42 | }; | |
43 | ||
44 | static int __init init_autcpu12_sram (void) | |
45 | { | |
46 | int err, save0, save1; | |
47 | ||
48 | autcpu12_sram_map.virt = ioremap(0x12000000, SZ_128K); | |
49 | if (!autcpu12_sram_map.virt) { | |
50 | printk("Failed to ioremap autcpu12 NV-RAM space\n"); | |
51 | err = -EIO; | |
52 | goto out; | |
53 | } | |
54 | simple_map_init(&autcpu_sram_map); | |
55 | ||
69f34c98 TG |
56 | /* |
57 | * Check for 32K/128K | |
58 | * read ofs 0 | |
59 | * read ofs 0x10000 | |
1da177e4 LT |
60 | * Write complement to ofs 0x100000 |
61 | * Read and check result on ofs 0x0 | |
62 | * Restore contents | |
63 | */ | |
64 | save0 = map_read32(&autcpu12_sram_map,0); | |
65 | save1 = map_read32(&autcpu12_sram_map,0x10000); | |
66 | map_write32(&autcpu12_sram_map,~save0,0x10000); | |
69f34c98 | 67 | /* if we find this pattern on 0x0, we have 32K size |
1da177e4 LT |
68 | * restore contents and exit |
69 | */ | |
70 | if ( map_read32(&autcpu12_sram_map,0) != save0) { | |
71 | map_write32(&autcpu12_sram_map,save0,0x0); | |
72 | goto map; | |
73 | } | |
74 | /* We have a 128K found, restore 0x10000 and set size | |
75 | * to 128K | |
76 | */ | |
77 | map_write32(&autcpu12_sram_map,save1,0x10000); | |
78 | autcpu12_sram_map.size = SZ_128K; | |
79 | ||
80 | map: | |
81 | sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map); | |
82 | if (!sram_mtd) { | |
83 | printk("NV-RAM probe failed\n"); | |
84 | err = -ENXIO; | |
85 | goto out_ioremap; | |
86 | } | |
87 | ||
88 | sram_mtd->owner = THIS_MODULE; | |
89 | sram_mtd->erasesize = 16; | |
69f34c98 | 90 | |
1da177e4 LT |
91 | if (add_mtd_device(sram_mtd)) { |
92 | printk("NV-RAM device addition failed\n"); | |
93 | err = -ENOMEM; | |
94 | goto out_probe; | |
95 | } | |
96 | ||
97 | printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K); | |
69f34c98 | 98 | |
1da177e4 LT |
99 | return 0; |
100 | ||
101 | out_probe: | |
102 | map_destroy(sram_mtd); | |
103 | sram_mtd = 0; | |
104 | ||
105 | out_ioremap: | |
106 | iounmap((void *)autcpu12_sram_map.virt); | |
107 | out: | |
108 | return err; | |
109 | } | |
110 | ||
111 | static void __exit cleanup_autcpu12_maps(void) | |
112 | { | |
113 | if (sram_mtd) { | |
114 | del_mtd_device(sram_mtd); | |
115 | map_destroy(sram_mtd); | |
116 | iounmap((void *)autcpu12_sram_map.virt); | |
117 | } | |
118 | } | |
119 | ||
120 | module_init(init_autcpu12_sram); | |
121 | module_exit(cleanup_autcpu12_maps); | |
122 | ||
123 | MODULE_AUTHOR("Thomas Gleixner"); | |
124 | MODULE_DESCRIPTION("autcpu12 NV-RAM map driver"); | |
125 | MODULE_LICENSE("GPL"); |