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 
24 static 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 
zoom_lcd_panel_init(void)29 static 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 
zoom_panel_enable_lcd(struct omap_dss_device * dssdev)39 static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
40 {
41 	return 0;
42 }
43 
zoom_panel_disable_lcd(struct omap_dss_device * dssdev)44 static 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 
zoom_set_bl_intensity(struct omap_dss_device * dssdev,int level)56 static 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 
97 static 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 
108 static struct omap_dss_device *zoom_dss_devices[] = {
109 	&zoom_lcd_device,
110 };
111 
112 static 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 
118 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
119 	.turbo_mode		= 1,
120 	.single_channel	= 1,  /* 0: slave, 1: master */
121 };
122 
123 static 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 
zoom_display_init(void)133 void __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 
141