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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/string.h>
16#include <asm/mach/sharpsl_param.h>
17
18/*
19 * Certain hardware parameters determined at the time of device manufacture,
20 * typically including LCD parameters are loaded by the bootloader at the
21 * address PARAM_BASE. As the kernel will overwrite them, we need to store
22 * them early in the boot process, then pass them to the appropriate drivers.
23 * Not all devices use all paramaters but the format is common to all.
24 */
Richard Purdied67947a2005-06-20 18:51:07 +010025#ifdef CONFIG_ARCH_SA1100
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define PARAM_BASE 0xe8ffc000
27#else
28#define PARAM_BASE 0xa0000a00
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
38struct sharpsl_param_info sharpsl_param;
39
40void sharpsl_save_param(void)
41{
42 memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
43
44 if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
45 sharpsl_param.comadj=-1;
46
47 if (sharpsl_param.phad_keyword != PHAD_MAGIC)
48 sharpsl_param.phadadj=-1;
49
50 if (sharpsl_param.uuid_keyword != UUID_MAGIC)
51 sharpsl_param.uuid[0]=-1;
52
53 if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
54 sharpsl_param.touch_xp=-1;
55
56 if (sharpsl_param.adadj_keyword != AD_MAGIC)
57 sharpsl_param.adadj=-1;
58}
59
60