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
38struct sharpsl_param_info sharpsl_param;
39EXPORT_SYMBOL(sharpsl_param);
40
41void 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

 
 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#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