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 42 struct sharpsl_param_info sharpsl_param; 43 EXPORT_SYMBOL(sharpsl_param); 44 45 void 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