blob: 025f6ce38596736eea2c929a211b23fd4eaf0d56 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -06001/*
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#include <asm/memory.h>
19
20/*
21 * Certain hardware parameters determined at the time of device manufacture,
22 * typically including LCD parameters are loaded by the bootloader at the
23 * address PARAM_BASE. As the kernel will overwrite them, we need to store
24 * them early in the boot process, then pass them to the appropriate drivers.
25 * Not all devices use all parameters but the format is common to all.
26 */
27#ifdef CONFIG_ARCH_SA1100
28#define PARAM_BASE 0xe8ffc000
29#define param_start(x) (void *)(x)
30#else
31#define PARAM_BASE 0xa0000a00
32#define param_start(x) __va(x)
33#endif
34#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a )
35
36#define COMADJ_MAGIC MAGIC_CHG('C','M','A','D')
37#define UUID_MAGIC MAGIC_CHG('U','U','I','D')
38#define TOUCH_MAGIC MAGIC_CHG('T','U','C','H')
39#define AD_MAGIC MAGIC_CHG('B','V','A','D')
40#define PHAD_MAGIC MAGIC_CHG('P','H','A','D')
41
42struct sharpsl_param_info sharpsl_param;
43EXPORT_SYMBOL(sharpsl_param);
44
45void sharpsl_save_param(void)
46{
47 memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
48
49 if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
50 sharpsl_param.comadj=-1;
51
52 if (sharpsl_param.phad_keyword != PHAD_MAGIC)
53 sharpsl_param.phadadj=-1;
54
55 if (sharpsl_param.uuid_keyword != UUID_MAGIC)
56 sharpsl_param.uuid[0]=-1;
57
58 if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
59 sharpsl_param.touch_xp=-1;
60
61 if (sharpsl_param.adadj_keyword != AD_MAGIC)
62 sharpsl_param.adadj=-1;
63}
64
65