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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/common/sharpsl_param.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/common/sharpsl_param.c')
-rw-r--r--arch/arm/common/sharpsl_param.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/arm/common/sharpsl_param.c b/arch/arm/common/sharpsl_param.c
new file mode 100644
index 000000000000..c2c557a224c2
--- /dev/null
+++ b/arch/arm/common/sharpsl_param.c
@@ -0,0 +1,60 @@
+/*
+ * Hardware parameter area specific to Sharp SL series devices
+ *
+ * Copyright (c) 2005 Richard Purdie
+ *
+ * Based on Sharp's 2.4 kernel patches
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <asm/mach/sharpsl_param.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 paramaters but the format is common to all.
+ */
+#ifdef ARCH_SA1100
+#define PARAM_BASE 0xe8ffc000
+#else
+#define PARAM_BASE 0xa0000a00
+#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;
+
+void sharpsl_save_param(void)
+{
+ memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
+
+ 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;
+}
+
+