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
 20#define LCD_PANEL_RESET_GPIO_PROD	96
 21#define LCD_PANEL_RESET_GPIO_PILOT	55
 22#define LCD_PANEL_QVGA_GPIO		56
 23
 24static struct gpio zoom_lcd_gpios[] __initdata = {
 25	{ -EINVAL,		GPIOF_OUT_INIT_HIGH, "lcd reset" },
 26	{ LCD_PANEL_QVGA_GPIO,	GPIOF_OUT_INIT_HIGH, "lcd qvga"	 },
 27};
 28
 29static void __init zoom_lcd_panel_init(void)
 30{
 31	zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
 32			LCD_PANEL_RESET_GPIO_PROD :
 33			LCD_PANEL_RESET_GPIO_PILOT;
 34
 35	if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
 36		pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
 37}
 38
 39static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
 40{
 41	return 0;
 42}
 43
 44static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
 45{
 46}
 47
 48/*
 49 * PWMA/B register offsets (TWL4030_MODULE_PWMA)
 50 */
 51#define TWL_INTBR_PMBR1	0xD
 52#define TWL_INTBR_GPBR1	0xC
 53#define TWL_LED_PWMON	0x0
 54#define TWL_LED_PWMOFF	0x1
 55
 56static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
 57{
 58	unsigned char c;
 59	u8 mux_pwm, enb_pwm;
 60
 61	if (level > 100)
 62		return -1;
 63
 64	twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
 65	twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
 66
 67	if (level == 0) {
 68		/* disable pwm1 output and clock */
 69		enb_pwm = enb_pwm & 0xF5;
 70		/* change pwm1 pin to gpio pin */
 71		mux_pwm = mux_pwm & 0xCF;
 72		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 73					enb_pwm, TWL_INTBR_GPBR1);
 74		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 75					mux_pwm, TWL_INTBR_PMBR1);
 76		return 0;
 77	}
 78
 79	if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
 80		/* change gpio pin to pwm1 pin */
 81		mux_pwm = mux_pwm | 0x30;
 82		/* enable pwm1 output and clock*/
 83		enb_pwm = enb_pwm | 0x0A;
 84		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 85					mux_pwm, TWL_INTBR_PMBR1);
 86		twl_i2c_write_u8(TWL4030_MODULE_INTBR,
 87					enb_pwm, TWL_INTBR_GPBR1);
 88	}
 89
 90	c = ((50 * (100 - level)) / 100) + 1;
 91	twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
 92	twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
 93
 94	return 0;
 95}
 96
 97static struct omap_dss_device zoom_lcd_device = {
 98	.name			= "lcd",
 99	.driver_name		= "NEC_8048_panel",
100	.type			= OMAP_DISPLAY_TYPE_DPI,
101	.phy.dpi.data_lines	= 24,
102	.platform_enable	= zoom_panel_enable_lcd,
103	.platform_disable	= zoom_panel_disable_lcd,
104	.max_backlight_level	= 100,
105	.set_backlight		= zoom_set_bl_intensity,
106};
107
108static struct omap_dss_device *zoom_dss_devices[] = {
109	&zoom_lcd_device,
110};
111
112static struct omap_dss_board_info zoom_dss_data = {
113	.num_devices		= ARRAY_SIZE(zoom_dss_devices),
114	.devices		= zoom_dss_devices,
115	.default_device		= &zoom_lcd_device,
116};
117
118static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
119	.turbo_mode		= 1,
120	.single_channel	= 1,  /* 0: slave, 1: master */
121};
122
123static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
124	[0] = {
125		.modalias		= "nec_8048_spi",
126		.bus_num		= 1,
127		.chip_select		= 2,
128		.max_speed_hz		= 375000,
129		.controller_data	= &dss_lcd_mcspi_config,
130	},
131};
132
133void __init zoom_display_init(void)
134{
135	omap_display_init(&zoom_dss_data);
136	spi_register_board_info(nec_8048_spi_board_info,
137				ARRAY_SIZE(nec_8048_spi_board_info));
138	zoom_lcd_panel_init();
139}
140