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61 lines
1.7 KiB
61 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Hardware parameter area specific to Sharp SL series devices |
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* |
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* Copyright (c) 2005 Richard Purdie |
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* |
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* Based on Sharp's 2.4 kernel patches |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <asm/mach/sharpsl_param.h> |
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#include <asm/memory.h> |
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/* |
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* Certain hardware parameters determined at the time of device manufacture, |
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* typically including LCD parameters are loaded by the bootloader at the |
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* address PARAM_BASE. As the kernel will overwrite them, we need to store |
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* them early in the boot process, then pass them to the appropriate drivers. |
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* Not all devices use all parameters but the format is common to all. |
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*/ |
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#ifdef CONFIG_ARCH_SA1100 |
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#define PARAM_BASE 0xe8ffc000 |
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#define param_start(x) (void *)(x) |
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#else |
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#define PARAM_BASE 0xa0000a00 |
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#define param_start(x) __va(x) |
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#endif |
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#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a ) |
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#define COMADJ_MAGIC MAGIC_CHG('C','M','A','D') |
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#define UUID_MAGIC MAGIC_CHG('U','U','I','D') |
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#define TOUCH_MAGIC MAGIC_CHG('T','U','C','H') |
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#define AD_MAGIC MAGIC_CHG('B','V','A','D') |
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#define PHAD_MAGIC MAGIC_CHG('P','H','A','D') |
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struct sharpsl_param_info sharpsl_param; |
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EXPORT_SYMBOL(sharpsl_param); |
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void sharpsl_save_param(void) |
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{ |
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memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info)); |
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if (sharpsl_param.comadj_keyword != COMADJ_MAGIC) |
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sharpsl_param.comadj=-1; |
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if (sharpsl_param.phad_keyword != PHAD_MAGIC) |
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sharpsl_param.phadadj=-1; |
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if (sharpsl_param.uuid_keyword != UUID_MAGIC) |
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sharpsl_param.uuid[0]=-1; |
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if (sharpsl_param.touch_keyword != TOUCH_MAGIC) |
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sharpsl_param.touch_xp=-1; |
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if (sharpsl_param.adadj_keyword != AD_MAGIC) |
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sharpsl_param.adadj=-1; |
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} |
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