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 #ifdef CONFIG_TWL4030_CORE
59 unsigned char c;
60 u8 mux_pwm, enb_pwm;
61
62 if (level > 100)
63 return -1;
64
65 twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
66 twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
67
68 if (level == 0) {
69 /* disable pwm1 output and clock */
70 enb_pwm = enb_pwm & 0xF5;
71 /* change pwm1 pin to gpio pin */
72 mux_pwm = mux_pwm & 0xCF;
73 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
74 enb_pwm, TWL_INTBR_GPBR1);
75 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
76 mux_pwm, TWL_INTBR_PMBR1);
77 return 0;
78 }
79
80 if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
81 /* change gpio pin to pwm1 pin */
82 mux_pwm = mux_pwm | 0x30;
83 /* enable pwm1 output and clock*/
84 enb_pwm = enb_pwm | 0x0A;
85 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
86 mux_pwm, TWL_INTBR_PMBR1);
87 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
88 enb_pwm, TWL_INTBR_GPBR1);
89 }
90
91 c = ((50 * (100 - level)) / 100) + 1;
92 twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
93 twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
94 #else
95 pr_warn("Backlight not enabled\n");
96 #endif
97
98 return 0;
99 }
100
101 static struct omap_dss_device zoom_lcd_device = {
102 .name = "lcd",
103 .driver_name = "NEC_8048_panel",
104 .type = OMAP_DISPLAY_TYPE_DPI,
105 .phy.dpi.data_lines = 24,
106 .platform_enable = zoom_panel_enable_lcd,
107 .platform_disable = zoom_panel_disable_lcd,
108 .max_backlight_level = 100,
109 .set_backlight = zoom_set_bl_intensity,
110 };
111
112 static struct omap_dss_device *zoom_dss_devices[] = {
113 &zoom_lcd_device,
114 };
115
116 static struct omap_dss_board_info zoom_dss_data = {
117 .num_devices = ARRAY_SIZE(zoom_dss_devices),
118 .devices = zoom_dss_devices,
119 .default_device = &zoom_lcd_device,
120 };
121
122 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
123 .turbo_mode = 1,
124 };
125
126 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
127 [0] = {
128 .modalias = "nec_8048_spi",
129 .bus_num = 1,
130 .chip_select = 2,
131 .max_speed_hz = 375000,
132 .controller_data = &dss_lcd_mcspi_config,
133 },
134 };
135
zoom_display_init(void)136 void __init zoom_display_init(void)
137 {
138 omap_display_init(&zoom_dss_data);
139 spi_register_board_info(nec_8048_spi_board_info,
140 ARRAY_SIZE(nec_8048_spi_board_info));
141 zoom_lcd_panel_init();
142 }
143
144