1/* 2 * LCD panel support for the TI LDP board 3 * 4 * Copyright (C) 2007 WindRiver 5 * Author: Stanley Miao <stanley.miao@windriver.com> 6 * 7 * Derived from drivers/video/omap/lcd-2430sdp.c 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 24#include <linux/module.h> 25#include <linux/platform_device.h> 26#include <linux/delay.h> 27#include <linux/i2c/twl.h> 28 29#include <mach/gpio.h> 30#include <plat/mux.h> 31#include <asm/mach-types.h> 32 33#include "omapfb.h" 34 35#define LCD_PANEL_BACKLIGHT_GPIO (15 + OMAP_MAX_GPIO_LINES) 36#define LCD_PANEL_ENABLE_GPIO (7 + OMAP_MAX_GPIO_LINES) 37 38#define LCD_PANEL_RESET_GPIO 55 39#define LCD_PANEL_QVGA_GPIO 56 40 41#ifdef CONFIG_FB_OMAP_LCD_VGA 42#define LCD_XRES 480 43#define LCD_YRES 640 44#define LCD_PIXCLOCK_MAX 41700 45#else 46#define LCD_XRES 240 47#define LCD_YRES 320 48#define LCD_PIXCLOCK_MAX 185186 49#endif 50 51#define PM_RECEIVER TWL4030_MODULE_PM_RECEIVER 52#define ENABLE_VAUX2_DEDICATED 0x09 53#define ENABLE_VAUX2_DEV_GRP 0x20 54#define ENABLE_VAUX3_DEDICATED 0x03 55#define ENABLE_VAUX3_DEV_GRP 0x20 56 57#define ENABLE_VPLL2_DEDICATED 0x05 58#define ENABLE_VPLL2_DEV_GRP 0xE0 59#define TWL4030_VPLL2_DEV_GRP 0x33 60#define TWL4030_VPLL2_DEDICATED 0x36 61 62#define t2_out(c, r, v) twl_i2c_write_u8(c, r, v) 63 64 65static int ldp_panel_init(struct lcd_panel *panel, 66 struct omapfb_device *fbdev) 67{ 68 gpio_request(LCD_PANEL_RESET_GPIO, "lcd reset"); 69 gpio_request(LCD_PANEL_QVGA_GPIO, "lcd qvga"); 70 gpio_request(LCD_PANEL_ENABLE_GPIO, "lcd panel"); 71 gpio_request(LCD_PANEL_BACKLIGHT_GPIO, "lcd backlight"); 72 73 gpio_direction_output(LCD_PANEL_QVGA_GPIO, 0); 74 gpio_direction_output(LCD_PANEL_RESET_GPIO, 0); 75 gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 0); 76 gpio_direction_output(LCD_PANEL_BACKLIGHT_GPIO, 0); 77 78#ifdef CONFIG_FB_OMAP_LCD_VGA 79 gpio_set_value(LCD_PANEL_QVGA_GPIO, 0); 80#else 81 gpio_set_value(LCD_PANEL_QVGA_GPIO, 1); 82#endif 83 gpio_set_value(LCD_PANEL_RESET_GPIO, 1); 84 85 return 0; 86} 87 88static void ldp_panel_cleanup(struct lcd_panel *panel) 89{ 90 gpio_free(LCD_PANEL_BACKLIGHT_GPIO); 91 gpio_free(LCD_PANEL_ENABLE_GPIO); 92 gpio_free(LCD_PANEL_QVGA_GPIO); 93 gpio_free(LCD_PANEL_RESET_GPIO); 94} 95 96static int ldp_panel_enable(struct lcd_panel *panel) 97{ 98 if (0 != t2_out(PM_RECEIVER, ENABLE_VPLL2_DEDICATED, 99 TWL4030_VPLL2_DEDICATED)) 100 return -EIO; 101 if (0 != t2_out(PM_RECEIVER, ENABLE_VPLL2_DEV_GRP, 102 TWL4030_VPLL2_DEV_GRP)) 103 return -EIO; 104 105 gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 1); 106 gpio_direction_output(LCD_PANEL_BACKLIGHT_GPIO, 1); 107 108 if (0 != t2_out(PM_RECEIVER, ENABLE_VAUX3_DEDICATED, 109 TWL4030_VAUX3_DEDICATED)) 110 return -EIO; 111 if (0 != t2_out(PM_RECEIVER, ENABLE_VAUX3_DEV_GRP, 112 TWL4030_VAUX3_DEV_GRP)) 113 return -EIO; 114 115 return 0; 116} 117 118static void ldp_panel_disable(struct lcd_panel *panel) 119{ 120 gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 0); 121 gpio_direction_output(LCD_PANEL_BACKLIGHT_GPIO, 0); 122 123 t2_out(PM_RECEIVER, 0x0, TWL4030_VPLL2_DEDICATED); 124 t2_out(PM_RECEIVER, 0x0, TWL4030_VPLL2_DEV_GRP); 125 msleep(4); 126} 127 128static unsigned long ldp_panel_get_caps(struct lcd_panel *panel) 129{ 130 return 0; 131} 132 133struct lcd_panel ldp_panel = { 134 .name = "ldp", 135 .config = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC | 136 OMAP_LCDC_INV_HSYNC, 137 138 .bpp = 16, 139 .data_lines = 18, 140 .x_res = LCD_XRES, 141 .y_res = LCD_YRES, 142 .hsw = 3, /* hsync_len (4) - 1 */ 143 .hfp = 3, /* right_margin (4) - 1 */ 144 .hbp = 39, /* left_margin (40) - 1 */ 145 .vsw = 1, /* vsync_len (2) - 1 */ 146 .vfp = 2, /* lower_margin */ 147 .vbp = 7, /* upper_margin (8) - 1 */ 148 149 .pixel_clock = LCD_PIXCLOCK_MAX, 150 151 .init = ldp_panel_init, 152 .cleanup = ldp_panel_cleanup, 153 .enable = ldp_panel_enable, 154 .disable = ldp_panel_disable, 155 .get_caps = ldp_panel_get_caps, 156}; 157 158static int ldp_panel_probe(struct platform_device *pdev) 159{ 160 omapfb_register_panel(&ldp_panel); 161 return 0; 162} 163 164static int ldp_panel_remove(struct platform_device *pdev) 165{ 166 return 0; 167} 168 169static int ldp_panel_suspend(struct platform_device *pdev, pm_message_t mesg) 170{ 171 return 0; 172} 173 174static int ldp_panel_resume(struct platform_device *pdev) 175{ 176 return 0; 177} 178 179struct platform_driver ldp_panel_driver = { 180 .probe = ldp_panel_probe, 181 .remove = ldp_panel_remove, 182 .suspend = ldp_panel_suspend, 183 .resume = ldp_panel_resume, 184 .driver = { 185 .name = "ldp_lcd", 186 .owner = THIS_MODULE, 187 }, 188}; 189 190static int __init ldp_panel_drv_init(void) 191{ 192 return platform_driver_register(&ldp_panel_driver); 193} 194 195static void __exit ldp_panel_drv_exit(void) 196{ 197 platform_driver_unregister(&ldp_panel_driver); 198} 199 200module_init(ldp_panel_drv_init); 201module_exit(ldp_panel_drv_exit); 202