Root/arch/arm/common/sharpsl_param.c

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>
15#include <linux/module.h>
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.
24 * Not all devices use all parameters but the format is common to all.
25 */
26#ifdef CONFIG_ARCH_SA1100
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
39struct sharpsl_param_info sharpsl_param;
40EXPORT_SYMBOL(sharpsl_param);
41
42void 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
63

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