LXR linux/arch/arm/common/sharpsl

   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/memory.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        memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
  44
  45        if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
  46                sharpsl_param.comadj=-1;
  47
  48        if (sharpsl_param.phad_keyword != PHAD_MAGIC)
  49                sharpsl_param.phadadj=-1;
  50
  51        if (sharpsl_param.uuid_keyword != UUID_MAGIC)
  52                sharpsl_param.uuid[0]=-1;
  53
  54        if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
  55                sharpsl_param.touch_xp=-1;
  56
  57        if (sharpsl_param.adadj_keyword != AD_MAGIC)
  58                sharpsl_param.adadj=-1;
  59}
  60
  61
  62