arch/arm/mach-omap2/board-zoom-display.c

   1 /*
   2  * Copyright (C) 2010 Texas Instruments Inc.
   3  *
   4  * Modified from mach-omap2/board-zoom-peripherals.c
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/gpio.h>
  15 #include <linux/i2c/twl.h>
  16 #include <linux/spi/spi.h>
  17 #include <plat/mcspi.h>
  18 #include <plat/display.h>
  19
  20 #define LCD_PANEL_RESET_GPIO_PROD       96
  21 #define LCD_PANEL_RESET_GPIO_PILOT      55
  22 #define LCD_PANEL_QVGA_GPIO             56
  23
  24 static void zoom_lcd_panel_init(void)
  25 {
  26         int ret;
  27         unsigned char lcd_panel_reset_gpio;
  28
  29         lcd_panel_reset_gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
  30                         LCD_PANEL_RESET_GPIO_PROD :
  31                         LCD_PANEL_RESET_GPIO_PILOT;
  32
  33         ret = gpio_request(lcd_panel_reset_gpio, "lcd reset");
  34         if (ret) {
  35                 pr_err("Failed to get LCD reset GPIO (gpio%d).\n",
  36                         lcd_panel_reset_gpio);
  37                 return;
  38         }
  39         gpio_direction_output(lcd_panel_reset_gpio, 1);
  40
  41         ret = gpio_request(LCD_PANEL_QVGA_GPIO, "lcd qvga");
  42         if (ret) {
  43                 pr_err("Failed to get LCD_PANEL_QVGA_GPIO (gpio%d).\n",
  44                         LCD_PANEL_QVGA_GPIO);
  45                 goto err0;
  46         }
  47         gpio_direction_output(LCD_PANEL_QVGA_GPIO, 1);
  48
  49         return;
  50 err0:
  51         gpio_free(lcd_panel_reset_gpio);
  52 }
  53
  54 static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
  55 {
  56         return 0;
  57 }
  58
  59 static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
  60 {
  61 }
  62
  63 /*
  64  * PWMA/B register offsets (TWL4030_MODULE_PWMA)
  65  */
  66 #define TWL_INTBR_PMBR1 0xD
  67 #define TWL_INTBR_GPBR1 0xC
  68 #define TWL_LED_PWMON   0x0
  69 #define TWL_LED_PWMOFF  0x1
  70
  71 static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
  72 {
  73         unsigned char c;
  74         u8 mux_pwm, enb_pwm;
  75
  76         if (level > 100)
  77                 return -1;
  78
  79         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
  80         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
  81
  82         if (level == 0) {
  83                 /* disable pwm1 output and clock */
  84                 enb_pwm = enb_pwm & 0xF5;
  85                 /* change pwm1 pin to gpio pin */
  86                 mux_pwm = mux_pwm & 0xCF;
  87                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  88                                         enb_pwm, TWL_INTBR_GPBR1);
  89                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  90                                         mux_pwm, TWL_INTBR_PMBR1);
  91                 return 0;
  92         }
  93
  94         if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
  95                 /* change gpio pin to pwm1 pin */
  96                 mux_pwm = mux_pwm | 0x30;
  97                 /* enable pwm1 output and clock*/
  98                 enb_pwm = enb_pwm | 0x0A;
  99                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 100                                         mux_pwm, TWL_INTBR_PMBR1);
 101                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 102                                         enb_pwm, TWL_INTBR_GPBR1);
 103         }
 104
 105         c = ((50 * (100 - level)) / 100) + 1;
 106         twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
 107         twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
 108
 109         return 0;
 110 }
 111
 112 static struct omap_dss_device zoom_lcd_device = {
 113         .name                   = "lcd",
 114         .driver_name            = "NEC_8048_panel",
 115         .type                   = OMAP_DISPLAY_TYPE_DPI,
 116         .phy.dpi.data_lines     = 24,
 117         .platform_enable        = zoom_panel_enable_lcd,
 118         .platform_disable       = zoom_panel_disable_lcd,
 119         .max_backlight_level    = 100,
 120         .set_backlight          = zoom_set_bl_intensity,
 121 };
 122
 123 static struct omap_dss_device *zoom_dss_devices[] = {
 124         &zoom_lcd_device,
 125 };
 126
 127 static struct omap_dss_board_info zoom_dss_data = {
 128         .num_devices            = ARRAY_SIZE(zoom_dss_devices),
 129         .devices                = zoom_dss_devices,
 130         .default_device         = &zoom_lcd_device,
 131 };
 132
 133 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
 134         .turbo_mode             = 1,
 135         .single_channel = 1,  /* 0: slave, 1: master */
 136 };
 137
 138 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
 139         [0] = {
 140                 .modalias               = "nec_8048_spi",
 141                 .bus_num                = 1,
 142                 .chip_select            = 2,
 143                 .max_speed_hz           = 375000,
 144                 .controller_data        = &dss_lcd_mcspi_config,
 145         },
 146 };
 147
 148 void __init zoom_display_init(void)
 149 {
 150         omap_display_init(&zoom_dss_data);
 151         spi_register_board_info(nec_8048_spi_board_info,
 152                                 ARRAY_SIZE(nec_8048_spi_board_info));
 153         zoom_lcd_panel_init();
 154 }
 155