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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm/common/sharpsl_param.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/common/sharpsl_param.c')
-rw-r--r-- | arch/arm/common/sharpsl_param.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arm/common/sharpsl_param.c b/arch/arm/common/sharpsl_param.c new file mode 100644 index 0000000000..1ca26c063f --- /dev/null +++ b/arch/arm/common/sharpsl_param.c @@ -0,0 +1,63 @@ +// 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; +} + + |