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/twl4030.h>
  28
  29 #include <mach/gpio.h>
  30 #include <mach/mux.h>
  31 #include <mach/omapfb.h>
  32 #include <asm/mach-types.h>
  33
  34 #define LCD_PANEL_BACKLIGHT_GPIO        (15 + OMAP_MAX_GPIO_LINES)
  35 #define LCD_PANEL_ENABLE_GPIO           (7 + OMAP_MAX_GPIO_LINES)
  36
  37 #define LCD_PANEL_RESET_GPIO            55
  38 #define LCD_PANEL_QVGA_GPIO             56
  39
  40 #ifdef CONFIG_FB_OMAP_LCD_VGA
  41 #define LCD_XRES                480
  42 #define LCD_YRES                640
  43 #define LCD_PIXCLOCK_MAX        41700
  44 #else
  45 #define LCD_XRES                240
  46 #define LCD_YRES                320
  47 #define LCD_PIXCLOCK_MAX        185186
  48 #endif
  49
  50 #define PM_RECEIVER             TWL4030_MODULE_PM_RECEIVER
  51 #define ENABLE_VAUX2_DEDICATED  0x09
  52 #define ENABLE_VAUX2_DEV_GRP    0x20
  53 #define ENABLE_VAUX3_DEDICATED  0x03
  54 #define ENABLE_VAUX3_DEV_GRP    0x20
  55
  56 #define ENABLE_VPLL2_DEDICATED          0x05
  57 #define ENABLE_VPLL2_DEV_GRP            0xE0
  58 #define TWL4030_VPLL2_DEV_GRP           0x33
  59 #define TWL4030_VPLL2_DEDICATED         0x36
  60
  61 #define t2_out(c, r, v) twl4030_i2c_write_u8(c, r, v)
  62
  63
  64 static int ldp_panel_init(struct lcd_panel *panel,
  65                                 struct omapfb_device *fbdev)
  66 {
  67         gpio_request(LCD_PANEL_RESET_GPIO, "lcd reset");
  68         gpio_request(LCD_PANEL_QVGA_GPIO, "lcd qvga");
  69         gpio_request(LCD_PANEL_ENABLE_GPIO, "lcd panel");
  70         gpio_request(LCD_PANEL_BACKLIGHT_GPIO, "lcd backlight");
  71
  72         gpio_direction_output(LCD_PANEL_QVGA_GPIO, 0);
  73         gpio_direction_output(LCD_PANEL_RESET_GPIO, 0);
  74         gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 0);
  75         gpio_direction_output(LCD_PANEL_BACKLIGHT_GPIO, 0);
  76
  77 #ifdef CONFIG_FB_OMAP_LCD_VGA
  78         gpio_set_value(LCD_PANEL_QVGA_GPIO, 0);
  79 #else
  80         gpio_set_value(LCD_PANEL_QVGA_GPIO, 1);
  81 #endif
  82         gpio_set_value(LCD_PANEL_RESET_GPIO, 1);
  83
  84         return 0;
  85 }
  86
  87 static void ldp_panel_cleanup(struct lcd_panel *panel)
  88 {
  89         gpio_free(LCD_PANEL_RESET_GPIO);
  90         gpio_free(LCD_PANEL_QVGA_GPIO);
  91         gpio_free(LCD_PANEL_ENABLE_GPIO);
  92         gpio_free(LCD_PANEL_BACKLIGHT_GPIO);
  93 }
  94
  95 static int ldp_panel_enable(struct lcd_panel *panel)
  96 {
  97         if (0 != t2_out(PM_RECEIVER, ENABLE_VPLL2_DEDICATED,
  98                         TWL4030_VPLL2_DEDICATED))
  99                 return -EIO;
 100         if (0 != t2_out(PM_RECEIVER, ENABLE_VPLL2_DEV_GRP,
 101                         TWL4030_VPLL2_DEV_GRP))
 102                 return -EIO;
 103
 104         gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 1);
 105         gpio_direction_output(LCD_PANEL_BACKLIGHT_GPIO, 1);
 106
 107         if (0 != t2_out(PM_RECEIVER, ENABLE_VAUX3_DEDICATED,
 108                                 TWL4030_VAUX3_DEDICATED))
 109                 return -EIO;
 110         if (0 != t2_out(PM_RECEIVER, ENABLE_VAUX3_DEV_GRP,
 111                                 TWL4030_VAUX3_DEV_GRP))
 112                 return -EIO;
 113
 114         return 0;
 115 }
 116
 117 static void ldp_panel_disable(struct lcd_panel *panel)
 118 {
 119         gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 0);
 120         gpio_direction_output(LCD_PANEL_BACKLIGHT_GPIO, 0);
 121
 122         t2_out(PM_RECEIVER, 0x0, TWL4030_VPLL2_DEDICATED);
 123         t2_out(PM_RECEIVER, 0x0, TWL4030_VPLL2_DEV_GRP);
 124         mdelay(4);
 125 }
 126
 127 static unsigned long ldp_panel_get_caps(struct lcd_panel *panel)
 128 {
 129         return 0;
 130 }
 131
 132 struct lcd_panel ldp_panel = {
 133         .name           = "ldp",
 134         .config         = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
 135                           OMAP_LCDC_INV_HSYNC,
 136
 137         .bpp            = 16,
 138         .data_lines     = 18,
 139         .x_res          = LCD_XRES,
 140         .y_res          = LCD_YRES,
 141         .hsw            = 3,            /* hsync_len (4) - 1 */
 142         .hfp            = 3,            /* right_margin (4) - 1 */
 143         .hbp            = 39,           /* left_margin (40) - 1 */
 144         .vsw            = 1,            /* vsync_len (2) - 1 */
 145         .vfp            = 2,            /* lower_margin */
 146         .vbp            = 7,            /* upper_margin (8) - 1 */
 147
 148         .pixel_clock    = LCD_PIXCLOCK_MAX,
 149
 150         .init           = ldp_panel_init,
 151         .cleanup        = ldp_panel_cleanup,
 152         .enable         = ldp_panel_enable,
 153         .disable        = ldp_panel_disable,
 154         .get_caps       = ldp_panel_get_caps,
 155 };
 156
 157 static int ldp_panel_probe(struct platform_device *pdev)
 158 {
 159         omapfb_register_panel(&ldp_panel);
 160         return 0;
 161 }
 162
 163 static int ldp_panel_remove(struct platform_device *pdev)
 164 {
 165         return 0;
 166 }
 167
 168 static int ldp_panel_suspend(struct platform_device *pdev, pm_message_t mesg)
 169 {
 170         return 0;
 171 }
 172
 173 static int ldp_panel_resume(struct platform_device *pdev)
 174 {
 175         return 0;
 176 }
 177
 178 struct platform_driver ldp_panel_driver = {
 179         .probe          = ldp_panel_probe,
 180         .remove         = ldp_panel_remove,
 181         .suspend        = ldp_panel_suspend,
 182         .resume         = ldp_panel_resume,
 183         .driver         = {
 184                 .name   = "ldp_lcd",
 185                 .owner  = THIS_MODULE,
 186         },
 187 };
 188
 189 static int __init ldp_panel_drv_init(void)
 190 {
 191         return platform_driver_register(&ldp_panel_driver);
 192 }
 193
 194 static void __exit ldp_panel_drv_exit(void)
 195 {
 196         platform_driver_unregister(&ldp_panel_driver);
 197 }
 198
 199 module_init(ldp_panel_drv_init);
 200 module_exit(ldp_panel_drv_exit);