1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Hardware parameter area specific to Sharp SL series devices
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2005 Richard Purdie
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Based on Sharp's 2.4 kernel patches
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun #include <asm/mach/sharpsl_param.h>
14*4882a593Smuzhiyun #include <asm/memory.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /*
17*4882a593Smuzhiyun * Certain hardware parameters determined at the time of device manufacture,
18*4882a593Smuzhiyun * typically including LCD parameters are loaded by the bootloader at the
19*4882a593Smuzhiyun * address PARAM_BASE. As the kernel will overwrite them, we need to store
20*4882a593Smuzhiyun * them early in the boot process, then pass them to the appropriate drivers.
21*4882a593Smuzhiyun * Not all devices use all parameters but the format is common to all.
22*4882a593Smuzhiyun */
23*4882a593Smuzhiyun #ifdef CONFIG_ARCH_SA1100
24*4882a593Smuzhiyun #define PARAM_BASE 0xe8ffc000
25*4882a593Smuzhiyun #define param_start(x) (void *)(x)
26*4882a593Smuzhiyun #else
27*4882a593Smuzhiyun #define PARAM_BASE 0xa0000a00
28*4882a593Smuzhiyun #define param_start(x) __va(x)
29*4882a593Smuzhiyun #endif
30*4882a593Smuzhiyun #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a )
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun #define COMADJ_MAGIC MAGIC_CHG('C','M','A','D')
33*4882a593Smuzhiyun #define UUID_MAGIC MAGIC_CHG('U','U','I','D')
34*4882a593Smuzhiyun #define TOUCH_MAGIC MAGIC_CHG('T','U','C','H')
35*4882a593Smuzhiyun #define AD_MAGIC MAGIC_CHG('B','V','A','D')
36*4882a593Smuzhiyun #define PHAD_MAGIC MAGIC_CHG('P','H','A','D')
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun struct sharpsl_param_info sharpsl_param;
39*4882a593Smuzhiyun EXPORT_SYMBOL(sharpsl_param);
40*4882a593Smuzhiyun
sharpsl_save_param(void)41*4882a593Smuzhiyun void sharpsl_save_param(void)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
46*4882a593Smuzhiyun sharpsl_param.comadj=-1;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun if (sharpsl_param.phad_keyword != PHAD_MAGIC)
49*4882a593Smuzhiyun sharpsl_param.phadadj=-1;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun if (sharpsl_param.uuid_keyword != UUID_MAGIC)
52*4882a593Smuzhiyun sharpsl_param.uuid[0]=-1;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
55*4882a593Smuzhiyun sharpsl_param.touch_xp=-1;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun if (sharpsl_param.adadj_keyword != AD_MAGIC)
58*4882a593Smuzhiyun sharpsl_param.adadj=-1;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun
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