aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/boards/mach-migor/lcd_qvga.c
blob: de9014a8a93ed3fffa961582f6bbfe960d33803a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*
 * Support for SuperH MigoR Quarter VGA LCD Panel
 *
 * Copyright (C) 2008 Magnus Damm
 *
 * Based on lcd_powertip.c from Kenati Technologies Pvt Ltd.
 * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
 *
 * 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/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <video/sh_mobile_lcdc.h>
#include <cpu/sh7722.h>
#include <mach/migor.h>

/* LCD Module is a PH240320T according to board schematics. This module
 * is made up of a 240x320 LCD hooked up to a R61505U (or HX8347-A01?)
 * Driver IC. This IC is connected to the SH7722 built-in LCDC using a
 * SYS-80 interface configured in 16 bit mode.
 *
 * Index 0: "Device Code Read" returns 0x1505.
 */

static void reset_lcd_module(void)
{
	gpio_set_value(GPIO_PTH2, 0);
	mdelay(2);
	gpio_set_value(GPIO_PTH2, 1);
	mdelay(1);
}

/* DB0-DB7 are connected to D1-D8, and DB8-DB15 to D10-D17 */

static unsigned long adjust_reg18(unsigned short data)
{
	unsigned long tmp1, tmp2;

	tmp1 = (data<<1 | 0x00000001) & 0x000001FF;
	tmp2 = (data<<2 | 0x00000200) & 0x0003FE00;
	return tmp1 | tmp2;
}

static void write_reg(void *sys_ops_handle,
		       struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
		       unsigned short reg, unsigned short data)
{
	sys_ops->write_index(sys_ops_handle, adjust_reg18(reg << 8 | data));
}

static void write_reg16(void *sys_ops_handle,
			struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
			unsigned short reg, unsigned short data)
{
	sys_ops->write_index(sys_ops_handle, adjust_reg18(reg));
	sys_ops->write_data(sys_ops_handle, adjust_reg18(data));
}

static unsigned long read_reg16(void *sys_ops_handle,
				struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
				unsigned short reg)
{
	unsigned long data;

	sys_ops->write_index(sys_ops_handle, adjust_reg18(reg));
	data = sys_ops->read_data(sys_ops_handle);
	return ((data >> 1) & 0xff) | ((data >> 2) & 0xff00);
}

static void migor_lcd_qvga_seq(void *sys_ops_handle,
			       struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
			       unsigned short const *data, int no_data)
{
	int i;

	for (i = 0; i < no_data; i += 2)
		write_reg16(sys_ops_handle, sys_ops, data[i], data[i + 1]);
}

static const unsigned short sync_data[] = {
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
};

static const unsigned short magic0_data[] = {
	0x0060, 0x2700, 0x0008, 0x0808, 0x0090, 0x001A, 0x0007, 0x0001,
	0x0017, 0x0001, 0x0019, 0x0000, 0x0010, 0x17B0, 0x0011, 0x0116,
	0x0012, 0x0198, 0x0013, 0x1400, 0x0029, 0x000C, 0x0012, 0x01B8,
};

static const unsigned short magic1_data[] = {
	0x0030, 0x0307, 0x0031, 0x0303, 0x0032, 0x0603, 0x0033, 0x0202,
	0x0034, 0x0202, 0x0035, 0x0202, 0x0036, 0x1F1F, 0x0037, 0x0303,
	0x0038, 0x0303, 0x0039, 0x0603, 0x003A, 0x0202, 0x003B, 0x0102,
	0x003C, 0x0204, 0x003D, 0x0000, 0x0001, 0x0100, 0x0002, 0x0300,
	0x0003, 0x5028, 0x0020, 0x00ef, 0x0021, 0x0000, 0x0004, 0x0000,
	0x0009, 0x0000, 0x000A, 0x0008, 0x000C, 0x0000, 0x000D, 0x0000,
	0x0015, 0x8000,
};

static const unsigned short magic2_data[] = {
	0x0061, 0x0001, 0x0092, 0x0100, 0x0093, 0x0001, 0x0007, 0x0021,
};

static const unsigned short magic3_data[] = {
	0x0010, 0x16B0, 0x0011, 0x0111, 0x0007, 0x0061,
};

int migor_lcd_qvga_setup(void *board_data, void *sohandle,
			 struct sh_mobile_lcdc_sys_bus_ops *so)
{
	unsigned long xres = 320;
	unsigned long yres = 240;
	int k;

	reset_lcd_module();
	migor_lcd_qvga_seq(sohandle, so, sync_data, ARRAY_SIZE(sync_data));

	if (read_reg16(sohandle, so, 0) != 0x1505)
		return -ENODEV;

	pr_info("Migo-R QVGA LCD Module detected.\n");

	migor_lcd_qvga_seq(sohandle, so, sync_data, ARRAY_SIZE(sync_data));
	write_reg16(sohandle, so, 0x00A4, 0x0001);
	mdelay(10);

	migor_lcd_qvga_seq(sohandle, so, magic0_data, ARRAY_SIZE(magic0_data));
	mdelay(100);

	migor_lcd_qvga_seq(sohandle, so, magic1_data, ARRAY_SIZE(magic1_data));
	write_reg16(sohandle, so, 0x0050, 0xef - (yres - 1));
	write_reg16(sohandle, so, 0x0051, 0x00ef);
	write_reg16(sohandle, so, 0x0052, 0x0000);
	write_reg16(sohandle, so, 0x0053, xres - 1);

	migor_lcd_qvga_seq(sohandle, so, magic2_data, ARRAY_SIZE(magic2_data));
	mdelay(10);

	migor_lcd_qvga_seq(sohandle, so, magic3_data, ARRAY_SIZE(magic3_data));
	mdelay(40);

	/* clear GRAM to avoid displaying garbage */

	write_reg16(sohandle, so, 0x0020, 0x0000); /* horiz addr */
	write_reg16(sohandle, so, 0x0021, 0x0000); /* vert addr */

	for (k = 0; k < (xres * 256); k++) /* yes, 256 words per line */
		write_reg16(sohandle, so, 0x0022, 0x0000);

	write_reg16(sohandle, so, 0x0020, 0x0000); /* reset horiz addr */
	write_reg16(sohandle, so, 0x0021, 0x0000); /* reset vert addr */
	write_reg16(sohandle, so, 0x0007, 0x0173);
	mdelay(40);

	/* enable display */
	write_reg(sohandle, so, 0x00, 0x22);
	mdelay(100);
	return 0;
}