LXR linux/arch/arm/common/sharpsl

   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
  66