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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Hardware parameter area specific to Sharp SL series devices | |
4 | * | |
5 | * Copyright (c) 2005 Richard Purdie | |
6 | * | |
7 | * Based on Sharp's 2.4 kernel patches | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
ec36b16d | 11 | #include <linux/module.h> |
1da177e4 LT |
12 | #include <linux/string.h> |
13 | #include <asm/mach/sharpsl_param.h> | |
85633728 | 14 | #include <asm/memory.h> |
1da177e4 LT |
15 | |
16 | /* | |
17 | * Certain hardware parameters determined at the time of device manufacture, | |
18 | * typically including LCD parameters are loaded by the bootloader at the | |
19 | * address PARAM_BASE. As the kernel will overwrite them, we need to store | |
20 | * them early in the boot process, then pass them to the appropriate drivers. | |
6cbdc8c5 | 21 | * Not all devices use all parameters but the format is common to all. |
1da177e4 | 22 | */ |
d67947a1 | 23 | #ifdef CONFIG_ARCH_SA1100 |
1da177e4 | 24 | #define PARAM_BASE 0xe8ffc000 |
85633728 | 25 | #define param_start(x) (void *)(x) |
1da177e4 LT |
26 | #else |
27 | #define PARAM_BASE 0xa0000a00 | |
85633728 | 28 | #define param_start(x) __va(x) |
1da177e4 LT |
29 | #endif |
30 | #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a ) | |
31 | ||
32 | #define COMADJ_MAGIC MAGIC_CHG('C','M','A','D') | |
33 | #define UUID_MAGIC MAGIC_CHG('U','U','I','D') | |
34 | #define TOUCH_MAGIC MAGIC_CHG('T','U','C','H') | |
35 | #define AD_MAGIC MAGIC_CHG('B','V','A','D') | |
36 | #define PHAD_MAGIC MAGIC_CHG('P','H','A','D') | |
37 | ||
38 | struct sharpsl_param_info sharpsl_param; | |
ec36b16d | 39 | EXPORT_SYMBOL(sharpsl_param); |
1da177e4 LT |
40 | |
41 | void sharpsl_save_param(void) | |
42 | { | |
85633728 | 43 | memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info)); |
1da177e4 LT |
44 | |
45 | if (sharpsl_param.comadj_keyword != COMADJ_MAGIC) | |
46 | sharpsl_param.comadj=-1; | |
47 | ||
48 | if (sharpsl_param.phad_keyword != PHAD_MAGIC) | |
49 | sharpsl_param.phadadj=-1; | |
50 | ||
51 | if (sharpsl_param.uuid_keyword != UUID_MAGIC) | |
52 | sharpsl_param.uuid[0]=-1; | |
53 | ||
54 | if (sharpsl_param.touch_keyword != TOUCH_MAGIC) | |
55 | sharpsl_param.touch_xp=-1; | |
56 | ||
57 | if (sharpsl_param.adadj_keyword != AD_MAGIC) | |
58 | sharpsl_param.adadj=-1; | |
59 | } | |
60 | ||
61 |