Release 4.11 arch/arm/common/sharpsl_param.c

/*
 * Hardware parameter area specific to Sharp SL series devices
 *
 * Copyright (c) 2005 Richard Purdie
 *
 * Based on Sharp's 2.4 kernel patches
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/mach/sharpsl_param.h>
#include <asm/memory.h>

/*
 * Certain hardware parameters determined at the time of device manufacture,
 * typically including LCD parameters are loaded by the bootloader at the
 * address PARAM_BASE. As the kernel will overwrite them, we need to store
 * them early in the boot process, then pass them to the appropriate drivers.
 * Not all devices use all parameters but the format is common to all.
 */
#ifdef CONFIG_ARCH_SA1100

#define PARAM_BASE	0xe8ffc000

#define param_start(x)	(void *)(x)
#else

#define PARAM_BASE	0xa0000a00

#define param_start(x)	__va(x)
#endif

#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 )  | ( b << 8 ) | a )


#define COMADJ_MAGIC	MAGIC_CHG('C','M','A','D')

#define UUID_MAGIC	MAGIC_CHG('U','U','I','D')

#define TOUCH_MAGIC	MAGIC_CHG('T','U','C','H')

#define AD_MAGIC	MAGIC_CHG('B','V','A','D')

#define PHAD_MAGIC	MAGIC_CHG('P','H','A','D')


struct sharpsl_param_info sharpsl_param;

EXPORT_SYMBOL(sharpsl_param);



void sharpsl_save_param(void)
{
	memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));

	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
		sharpsl_param.comadj=-1;

	if (sharpsl_param.phad_keyword != PHAD_MAGIC)
		sharpsl_param.phadadj=-1;

	if (sharpsl_param.uuid_keyword != UUID_MAGIC)
		sharpsl_param.uuid[0]=-1;

	if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
		sharpsl_param.touch_xp=-1;

	if (sharpsl_param.adadj_keyword != AD_MAGIC)
		sharpsl_param.adadj=-1;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Richard Purdie
99
97.06%
1
50.00%
Andrea Adami
3
2.94%
1
50.00%
Total
102
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Richard Purdie
161
84.74%
2
40.00%
Andrea Adami
20
10.53%
1
20.00%
Dmitry Baryshkov
8
4.21%
1
20.00%
Simon Arlott
1
0.53%
1
20.00%
Total
190
100.00%
5
100.00%
Directory: arch/arm/common

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.