drivers/video/omap/lcd_ldp.c

   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
  65 static 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
  88 static 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
  96 static 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
 118 static 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
 128 static unsigned long ldp_panel_get_caps(struct lcd_panel *panel)
 129 {
 130         return 0;
 131 }
 132
 133 struct 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
 158 static int ldp_panel_probe(struct platform_device *pdev)
 159 {
 160         omapfb_register_panel(&ldp_panel);
 161         return 0;
 162 }
 163
 164 static int ldp_panel_remove(struct platform_device *pdev)
 165 {
 166         return 0;
 167 }
 168
 169 static int ldp_panel_suspend(struct platform_device *pdev, pm_message_t mesg)
 170 {
 171         return 0;
 172 }
 173
 174 static int ldp_panel_resume(struct platform_device *pdev)
 175 {
 176         return 0;
 177 }
 178
 179 struct 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
 190 static int __init ldp_panel_drv_init(void)
 191 {
 192         return platform_driver_register(&ldp_panel_driver);
 193 }
 194
 195 static void __exit ldp_panel_drv_exit(void)
 196 {
 197         platform_driver_unregister(&ldp_panel_driver);
 198 }
 199
 200 module_init(ldp_panel_drv_init);
 201 module_exit(ldp_panel_drv_exit);