1 | // SPDX-License-Identifier: GPL-2.0-only |
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 |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/string.h> |
13 | #include <asm/mach/sharpsl_param.h> |
14 | #include <asm/page.h> |
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. |
21 | * Not all devices use all parameters but the format is common to all. |
22 | */ |
23 | #ifdef CONFIG_ARCH_SA1100 |
24 | #define PARAM_BASE 0xe8ffc000 |
25 | #define param_start(x) (void *)(x) |
26 | #else |
27 | #define PARAM_BASE 0xa0000a00 |
28 | #define param_start(x) __va(x) |
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; |
39 | EXPORT_SYMBOL(sharpsl_param); |
40 | |
41 | void sharpsl_save_param(void) |
42 | { |
43 | struct sharpsl_param_info *params = param_start(PARAM_BASE); |
44 | |
45 | memcpy(&sharpsl_param, params, sizeof(*params)); |
46 | |
47 | if (sharpsl_param.comadj_keyword != COMADJ_MAGIC) |
48 | sharpsl_param.comadj=-1; |
49 | |
50 | if (sharpsl_param.phad_keyword != PHAD_MAGIC) |
51 | sharpsl_param.phadadj=-1; |
52 | |
53 | if (sharpsl_param.uuid_keyword != UUID_MAGIC) |
54 | sharpsl_param.uuid[0]=-1; |
55 | |
56 | if (sharpsl_param.touch_keyword != TOUCH_MAGIC) |
57 | sharpsl_param.touch_xp=-1; |
58 | |
59 | if (sharpsl_param.adadj_keyword != AD_MAGIC) |
60 | sharpsl_param.adadj=-1; |
61 | } |
62 | |
63 | |
64 | |