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 19 /* 20 * Certain hardware parameters determined at the time of device manufacture, 21 * typically including LCD parameters are loaded by the bootloader at the 22 * address PARAM_BASE. As the kernel will overwrite them, we need to store 23 * them early in the boot process, then pass them to the appropriate drivers. 24 * Not all devices use all parameters but the format is common to all. 25 */ 26 #ifdef CONFIG_ARCH_SA1100 27 #define PARAM_BASE 0xe8ffc000 28 #else 29 #define PARAM_BASE 0xa0000a00 30 #endif 31 #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a ) 32 33 #define COMADJ_MAGIC MAGIC_CHG('C','M','A','D') 34 #define UUID_MAGIC MAGIC_CHG('U','U','I','D') 35 #define TOUCH_MAGIC MAGIC_CHG('T','U','C','H') 36 #define AD_MAGIC MAGIC_CHG('B','V','A','D') 37 #define PHAD_MAGIC MAGIC_CHG('P','H','A','D') 38 39 struct sharpsl_param_info sharpsl_param; 40 EXPORT_SYMBOL(sharpsl_param); 41 42 void sharpsl_save_param(void) 43 { 44 memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info)); 45 46 if (sharpsl_param.comadj_keyword != COMADJ_MAGIC) 47 sharpsl_param.comadj=-1; 48 49 if (sharpsl_param.phad_keyword != PHAD_MAGIC) 50 sharpsl_param.phadadj=-1; 51 52 if (sharpsl_param.uuid_keyword != UUID_MAGIC) 53 sharpsl_param.uuid[0]=-1; 54 55 if (sharpsl_param.touch_keyword != TOUCH_MAGIC) 56 sharpsl_param.touch_xp=-1; 57 58 if (sharpsl_param.adadj_keyword != AD_MAGIC) 59 sharpsl_param.adadj=-1; 60 } 61 62 63