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 <video/omapdss.h>
 19#include <mach/board-zoom.h>
 20
 21#define LCD_PANEL_RESET_GPIO_PROD	96
 22#define LCD_PANEL_RESET_GPIO_PILOT	55
 23#define LCD_PANEL_QVGA_GPIO		56
 24
 25static struct gpio zoom_lcd_gpios[] __initdata = {
 26	{ -EINVAL,		GPIOF_OUT_INIT_HIGH, "lcd reset" },
 27	{ LCD_PANEL_QVGA_GPIO,	GPIOF_OUT_INIT_HIGH, "lcd qvga"	 },
 28};
 29
 30static void __init zoom_lcd_panel_init(void)
 31{
 32	zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
 33			LCD_PANEL_RESET_GPIO_PROD :
 34			LCD_PANEL_RESET_GPIO_PILOT;
 35
 36	if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
 37		pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
 38}
 39
 40static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
 41{
 42	return 0;
 43}
 44
 45static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
 46{
 47}
 48
 49/*
 50 * PWMA/B register offsets (TWL4030_MODULE_PWMA)
 51 */
 52#define TWL_INTBR_PMBR1	0xD
 53#define TWL_INTBR_GPBR1	0xC
 54#define TWL_LED_PWMON	0x0
 55#define TWL_LED_PWMOFF	0x1
 56
 57static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
 58{
 59#ifdef CONFIG_TWL4030_CORE
 60	unsigned char c;
 61	u8 mux_pwm, enb_pwm;
 62
 63	if (level > 100)
 64		return -1;
 65
 66	twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
 67	twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
 68
 69	if (level == 0) {
 70		/* disable pwm1 output and clock */
 71		enb_pwm = enb_pwm & 0xF5;
 72		/* change pwm1 pin to gpio pin */
 73		mux_pwm = mux_pwm & 0xCF;
 74		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 75					enb_pwm, TWL_INTBR_GPBR1);
 76		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 77					mux_pwm, TWL_INTBR_PMBR1);
 78		return 0;
 79	}
 80
 81	if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
 82		/* change gpio pin to pwm1 pin */
 83		mux_pwm = mux_pwm | 0x30;
 84		/* enable pwm1 output and clock*/
 85		enb_pwm = enb_pwm | 0x0A;
 86		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 87					mux_pwm, TWL_INTBR_PMBR1);
 88		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 89					enb_pwm, TWL_INTBR_GPBR1);
 90	}
 91
 92	c = ((50 * (100 - level)) / 100) + 1;
 93	twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
 94	twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
 95#else
 96	pr_warn("Backlight not enabled\n");
 97#endif
 98
 99	return 0;
100}
101
102static struct omap_dss_device zoom_lcd_device = {
103	.name			= "lcd",
104	.driver_name		= "NEC_8048_panel",
105	.type			= OMAP_DISPLAY_TYPE_DPI,
106	.phy.dpi.data_lines	= 24,
107	.platform_enable	= zoom_panel_enable_lcd,
108	.platform_disable	= zoom_panel_disable_lcd,
109	.max_backlight_level	= 100,
110	.set_backlight		= zoom_set_bl_intensity,
111};
112
113static struct omap_dss_device *zoom_dss_devices[] = {
114	&zoom_lcd_device,
115};
116
117static struct omap_dss_board_info zoom_dss_data = {
118	.num_devices		= ARRAY_SIZE(zoom_dss_devices),
119	.devices		= zoom_dss_devices,
120	.default_device		= &zoom_lcd_device,
121};
122
123static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
124	.turbo_mode		= 1,
125};
126
127static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
128	[0] = {
129		.modalias		= "nec_8048_spi",
130		.bus_num		= 1,
131		.chip_select		= 2,
132		.max_speed_hz		= 375000,
133		.controller_data	= &dss_lcd_mcspi_config,
134	},
135};
136
137void __init zoom_display_init(void)
138{
139	omap_display_init(&zoom_dss_data);
140	spi_register_board_info(nec_8048_spi_board_info,
141				ARRAY_SIZE(nec_8048_spi_board_info));
142	zoom_lcd_panel_init();
143}
144