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1da177e4 LT |
1 | /* |
2 | * Hardware parameter area specific to Sharp SL series devices | |
3 | * | |
4 | * Copyright (c) 2005 Richard Purdie | |
5 | * | |
6 | * Based on Sharp's 2.4 kernel patches | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
ec36b16d | 15 | #include <linux/module.h> |
1da177e4 LT |
16 | #include <linux/string.h> |
17 | #include <asm/mach/sharpsl_param.h> | |
18 | ||
19 | /* | |
20 | * Certain hardware parameters determined at the time of device manufacture, | |
21 | * typically including LCD parameters are loaded by the bootloader at the | |
22 | * address PARAM_BASE. As the kernel will overwrite them, we need to store | |
23 | * them early in the boot process, then pass them to the appropriate drivers. | |
6cbdc8c5 | 24 | * Not all devices use all parameters but the format is common to all. |
1da177e4 | 25 | */ |
d67947a1 | 26 | #ifdef CONFIG_ARCH_SA1100 |
1da177e4 LT |
27 | #define PARAM_BASE 0xe8ffc000 |
28 | #else | |
29 | #define PARAM_BASE 0xa0000a00 | |
30 | #endif | |
31 | #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a ) | |
32 | ||
33 | #define COMADJ_MAGIC MAGIC_CHG('C','M','A','D') | |
34 | #define UUID_MAGIC MAGIC_CHG('U','U','I','D') | |
35 | #define TOUCH_MAGIC MAGIC_CHG('T','U','C','H') | |
36 | #define AD_MAGIC MAGIC_CHG('B','V','A','D') | |
37 | #define PHAD_MAGIC MAGIC_CHG('P','H','A','D') | |
38 | ||
39 | struct sharpsl_param_info sharpsl_param; | |
ec36b16d | 40 | EXPORT_SYMBOL(sharpsl_param); |
1da177e4 LT |
41 | |
42 | void sharpsl_save_param(void) | |
43 | { | |
44 | memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info)); | |
45 | ||
46 | if (sharpsl_param.comadj_keyword != COMADJ_MAGIC) | |
47 | sharpsl_param.comadj=-1; | |
48 | ||
49 | if (sharpsl_param.phad_keyword != PHAD_MAGIC) | |
50 | sharpsl_param.phadadj=-1; | |
51 | ||
52 | if (sharpsl_param.uuid_keyword != UUID_MAGIC) | |
53 | sharpsl_param.uuid[0]=-1; | |
54 | ||
55 | if (sharpsl_param.touch_keyword != TOUCH_MAGIC) | |
56 | sharpsl_param.touch_xp=-1; | |
57 | ||
58 | if (sharpsl_param.adadj_keyword != AD_MAGIC) | |
59 | sharpsl_param.adadj=-1; | |
60 | } | |
61 | ||
62 |