LXR linux/arch/sh/boards/mach-migor/lcd

   1/*
   2 * Support for SuperH MigoR Quarter VGA LCD Panel
   3 *
   4 * Copyright (C) 2008 Magnus Damm
   5 *
   6 * Based on lcd_powertip.c from Kenati Technologies Pvt Ltd.
   7 * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/delay.h>
  15#include <linux/err.h>
  16#include <linux/fb.h>
  17#include <linux/init.h>
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/gpio.h>
  21#include <video/sh_mobile_lcdc.h>
  22#include <cpu/sh7722.h>
  23#include <mach/migor.h>
  24
  25/* LCD Module is a PH240320T according to board schematics. This module
  26 * is made up of a 240x320 LCD hooked up to a R61505U (or HX8347-A01?)
  27 * Driver IC. This IC is connected to the SH7722 built-in LCDC using a
  28 * SYS-80 interface configured in 16 bit mode.
  29 *
  30 * Index 0: "Device Code Read" returns 0x1505.
  31 */
  32
  33static void reset_lcd_module(void)
  34{
  35        gpio_set_value(GPIO_PTH2, 0);
  36        mdelay(2);
  37        gpio_set_value(GPIO_PTH2, 1);
  38        mdelay(1);
  39}
  40
  41/* DB0-DB7 are connected to D1-D8, and DB8-DB15 to D10-D17 */
  42
  43static unsigned long adjust_reg18(unsigned short data)
  44{
  45        unsigned long tmp1, tmp2;
  46
  47        tmp1 = (data<<1 | 0x00000001) & 0x000001FF;
  48        tmp2 = (data<<2 | 0x00000200) & 0x0003FE00;
  49        return tmp1 | tmp2;
  50}
  51
  52static void write_reg(void *sys_ops_handle,
  53                       struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
  54                       unsigned short reg, unsigned short data)
  55{
  56        sys_ops->write_index(sys_ops_handle, adjust_reg18(reg << 8 | data));
  57}
  58
  59static void write_reg16(void *sys_ops_handle,
  60                        struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
  61                        unsigned short reg, unsigned short data)
  62{
  63        sys_ops->write_index(sys_ops_handle, adjust_reg18(reg));
  64        sys_ops->write_data(sys_ops_handle, adjust_reg18(data));
  65}
  66
  67static unsigned long read_reg16(void *sys_ops_handle,
  68                                struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
  69                                unsigned short reg)
  70{
  71        unsigned long data;
  72
  73        sys_ops->write_index(sys_ops_handle, adjust_reg18(reg));
  74        data = sys_ops->read_data(sys_ops_handle);
  75        return ((data >> 1) & 0xff) | ((data >> 2) & 0xff00);
  76}
  77
  78static void migor_lcd_qvga_seq(void *sys_ops_handle,
  79                               struct sh_mobile_lcdc_sys_bus_ops *sys_ops,
  80                               unsigned short const *data, int no_data)
  81{
  82        int i;
  83
  84        for (i = 0; i < no_data; i += 2)
  85                write_reg16(sys_ops_handle, sys_ops, data[i], data[i + 1]);
  86}
  87
  88static const unsigned short sync_data[] = {
  89        0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  90};
  91
  92static const unsigned short magic0_data[] = {
  93        0x0060, 0x2700, 0x0008, 0x0808, 0x0090, 0x001A, 0x0007, 0x0001,
  94        0x0017, 0x0001, 0x0019, 0x0000, 0x0010, 0x17B0, 0x0011, 0x0116,
  95        0x0012, 0x0198, 0x0013, 0x1400, 0x0029, 0x000C, 0x0012, 0x01B8,
  96};
  97
  98static const unsigned short magic1_data[] = {
  99        0x0030, 0x0307, 0x0031, 0x0303, 0x0032, 0x0603, 0x0033, 0x0202,
 100        0x0034, 0x0202, 0x0035, 0x0202, 0x0036, 0x1F1F, 0x0037, 0x0303,
 101        0x0038, 0x0303, 0x0039, 0x0603, 0x003A, 0x0202, 0x003B, 0x0102,
 102        0x003C, 0x0204, 0x003D, 0x0000, 0x0001, 0x0100, 0x0002, 0x0300,
 103        0x0003, 0x5028, 0x0020, 0x00ef, 0x0021, 0x0000, 0x0004, 0x0000,
 104        0x0009, 0x0000, 0x000A, 0x0008, 0x000C, 0x0000, 0x000D, 0x0000,
 105        0x0015, 0x8000,
 106};
 107
 108static const unsigned short magic2_data[] = {
 109        0x0061, 0x0001, 0x0092, 0x0100, 0x0093, 0x0001, 0x0007, 0x0021,
 110};
 111
 112static const unsigned short magic3_data[] = {
 113        0x0010, 0x16B0, 0x0011, 0x0111, 0x0007, 0x0061,
 114};
 115
 116int migor_lcd_qvga_setup(void *sohandle, struct sh_mobile_lcdc_sys_bus_ops *so)
 117{
 118        unsigned long xres = 320;
 119        unsigned long yres = 240;
 120        int k;
 121
 122        reset_lcd_module();
 123        migor_lcd_qvga_seq(sohandle, so, sync_data, ARRAY_SIZE(sync_data));
 124
 125        if (read_reg16(sohandle, so, 0) != 0x1505)
 126                return -ENODEV;
 127
 128        pr_info("Migo-R QVGA LCD Module detected.\n");
 129
 130        migor_lcd_qvga_seq(sohandle, so, sync_data, ARRAY_SIZE(sync_data));
 131        write_reg16(sohandle, so, 0x00A4, 0x0001);
 132        mdelay(10);
 133
 134        migor_lcd_qvga_seq(sohandle, so, magic0_data, ARRAY_SIZE(magic0_data));
 135        mdelay(100);
 136
 137        migor_lcd_qvga_seq(sohandle, so, magic1_data, ARRAY_SIZE(magic1_data));
 138        write_reg16(sohandle, so, 0x0050, 0xef - (yres - 1));
 139        write_reg16(sohandle, so, 0x0051, 0x00ef);
 140        write_reg16(sohandle, so, 0x0052, 0x0000);
 141        write_reg16(sohandle, so, 0x0053, xres - 1);
 142
 143        migor_lcd_qvga_seq(sohandle, so, magic2_data, ARRAY_SIZE(magic2_data));
 144        mdelay(10);
 145
 146        migor_lcd_qvga_seq(sohandle, so, magic3_data, ARRAY_SIZE(magic3_data));
 147        mdelay(40);
 148
 149        /* clear GRAM to avoid displaying garbage */
 150
 151        write_reg16(sohandle, so, 0x0020, 0x0000); /* horiz addr */
 152        write_reg16(sohandle, so, 0x0021, 0x0000); /* vert addr */
 153
 154        for (k = 0; k < (xres * 256); k++) /* yes, 256 words per line */
 155                write_reg16(sohandle, so, 0x0022, 0x0000);
 156
 157        write_reg16(sohandle, so, 0x0020, 0x0000); /* reset horiz addr */
 158        write_reg16(sohandle, so, 0x0021, 0x0000); /* reset vert addr */
 159        write_reg16(sohandle, so, 0x0007, 0x0173);
 160        mdelay(40);
 161
 162        /* enable display */
 163        write_reg(sohandle, so, 0x00, 0x22);
 164        mdelay(100);
 165        return 0;
 166}
 167