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// SPDX-License-Identifier: GPL-2.0-only /* * Hardware parameter area specific to Sharp SL series devices * * Copyright (c) 2005 Richard Purdie * * Based on Sharp's 2.4 kernel patches */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/string.h> #include <asm/mach/sharpsl_param.h> #include <asm/page.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) { struct sharpsl_param_info *params = param_start(PARAM_BASE); memcpy(&sharpsl_param, params, sizeof(*params)); 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; } |