release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/video/omap/lcd_2430sdp.c

   1 /*
   2  * LCD panel support for the TI 2430SDP board
   3  *
   4  * Copyright (C) 2007 MontaVista
   5  * Author: Hunyue Yau <hyau@mvista.com>
   6  *
   7  * Derived from drivers/video/omap/lcd-apollon.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/gpio.h>
  28 #include <linux/i2c/twl.h>
  29
  30 #include <plat/mux.h>
  31 #include <asm/mach-types.h>
  32
  33 #include "omapfb.h"
  34
  35 #define SDP2430_LCD_PANEL_BACKLIGHT_GPIO        91
  36 #define SDP2430_LCD_PANEL_ENABLE_GPIO           154
  37 #define SDP3430_LCD_PANEL_BACKLIGHT_GPIO        24
  38 #define SDP3430_LCD_PANEL_ENABLE_GPIO           28
  39
  40 static unsigned backlight_gpio;
  41 static unsigned enable_gpio;
  42
  43 #define LCD_PIXCLOCK_MAX                5400 /* freq 5.4 MHz */
  44 #define PM_RECEIVER             TWL4030_MODULE_PM_RECEIVER
  45 #define ENABLE_VAUX2_DEDICATED  0x09
  46 #define ENABLE_VAUX2_DEV_GRP    0x20
  47 #define ENABLE_VAUX3_DEDICATED  0x03
  48 #define ENABLE_VAUX3_DEV_GRP    0x20
  49
  50 #define ENABLE_VPLL2_DEDICATED          0x05
  51 #define ENABLE_VPLL2_DEV_GRP            0xE0
  52 #define TWL4030_VPLL2_DEV_GRP           0x33
  53 #define TWL4030_VPLL2_DEDICATED         0x36
  54
  55 #define t2_out(c, r, v) twl_i2c_write_u8(c, r, v)
  56
  57
  58 static int sdp2430_panel_init(struct lcd_panel *panel,
  59                                 struct omapfb_device *fbdev)
  60 {
  61         if (machine_is_omap_3430sdp()) {
  62                 enable_gpio    = SDP3430_LCD_PANEL_ENABLE_GPIO;
  63                 backlight_gpio = SDP3430_LCD_PANEL_BACKLIGHT_GPIO;
  64         } else {
  65                 enable_gpio    = SDP2430_LCD_PANEL_ENABLE_GPIO;
  66                 backlight_gpio = SDP2430_LCD_PANEL_BACKLIGHT_GPIO;
  67         }
  68
  69         gpio_request(enable_gpio, "LCD enable");        /* LCD panel */
  70         gpio_request(backlight_gpio, "LCD bl");         /* LCD backlight */
  71         gpio_direction_output(enable_gpio, 0);
  72         gpio_direction_output(backlight_gpio, 0);
  73
  74         return 0;
  75 }
  76
  77 static void sdp2430_panel_cleanup(struct lcd_panel *panel)
  78 {
  79         gpio_free(backlight_gpio);
  80         gpio_free(enable_gpio);
  81 }
  82
  83 static int sdp2430_panel_enable(struct lcd_panel *panel)
  84 {
  85         u8 ded_val, ded_reg;
  86         u8 grp_val, grp_reg;
  87
  88         if (machine_is_omap_3430sdp()) {
  89                 ded_reg = TWL4030_VAUX3_DEDICATED;
  90                 ded_val = ENABLE_VAUX3_DEDICATED;
  91                 grp_reg = TWL4030_VAUX3_DEV_GRP;
  92                 grp_val = ENABLE_VAUX3_DEV_GRP;
  93
  94                 if (omap_rev() > OMAP3430_REV_ES1_0) {
  95                         t2_out(PM_RECEIVER, ENABLE_VPLL2_DEDICATED,
  96                                         TWL4030_VPLL2_DEDICATED);
  97                         t2_out(PM_RECEIVER, ENABLE_VPLL2_DEV_GRP,
  98                                         TWL4030_VPLL2_DEV_GRP);
  99                 }
 100         } else {
 101                 ded_reg = TWL4030_VAUX2_DEDICATED;
 102                 ded_val = ENABLE_VAUX2_DEDICATED;
 103                 grp_reg = TWL4030_VAUX2_DEV_GRP;
 104                 grp_val = ENABLE_VAUX2_DEV_GRP;
 105         }
 106
 107         gpio_set_value(enable_gpio, 1);
 108         gpio_set_value(backlight_gpio, 1);
 109
 110         if (0 != t2_out(PM_RECEIVER, ded_val, ded_reg))
 111                 return -EIO;
 112         if (0 != t2_out(PM_RECEIVER, grp_val, grp_reg))
 113                 return -EIO;
 114
 115         return 0;
 116 }
 117
 118 static void sdp2430_panel_disable(struct lcd_panel *panel)
 119 {
 120         gpio_set_value(enable_gpio, 0);
 121         gpio_set_value(backlight_gpio, 0);
 122         if (omap_rev() > OMAP3430_REV_ES1_0) {
 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
 129 static unsigned long sdp2430_panel_get_caps(struct lcd_panel *panel)
 130 {
 131         return 0;
 132 }
 133
 134 struct lcd_panel sdp2430_panel = {
 135         .name           = "sdp2430",
 136         .config         = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
 137                           OMAP_LCDC_INV_HSYNC,
 138
 139         .bpp            = 16,
 140         .data_lines     = 16,
 141         .x_res          = 240,
 142         .y_res          = 320,
 143         .hsw            = 3,            /* hsync_len (4) - 1 */
 144         .hfp            = 3,            /* right_margin (4) - 1 */
 145         .hbp            = 39,           /* left_margin (40) - 1 */
 146         .vsw            = 1,            /* vsync_len (2) - 1 */
 147         .vfp            = 2,            /* lower_margin */
 148         .vbp            = 7,            /* upper_margin (8) - 1 */
 149
 150         .pixel_clock    = LCD_PIXCLOCK_MAX,
 151
 152         .init           = sdp2430_panel_init,
 153         .cleanup        = sdp2430_panel_cleanup,
 154         .enable         = sdp2430_panel_enable,
 155         .disable        = sdp2430_panel_disable,
 156         .get_caps       = sdp2430_panel_get_caps,
 157 };
 158
 159 static int sdp2430_panel_probe(struct platform_device *pdev)
 160 {
 161         omapfb_register_panel(&sdp2430_panel);
 162         return 0;
 163 }
 164
 165 static int sdp2430_panel_remove(struct platform_device *pdev)
 166 {
 167         return 0;
 168 }
 169
 170 static int sdp2430_panel_suspend(struct platform_device *pdev,
 171                                         pm_message_t mesg)
 172 {
 173         return 0;
 174 }
 175
 176 static int sdp2430_panel_resume(struct platform_device *pdev)
 177 {
 178         return 0;
 179 }
 180
 181 struct platform_driver sdp2430_panel_driver = {
 182         .probe          = sdp2430_panel_probe,
 183         .remove         = sdp2430_panel_remove,
 184         .suspend        = sdp2430_panel_suspend,
 185         .resume         = sdp2430_panel_resume,
 186         .driver         = {
 187                 .name   = "sdp2430_lcd",
 188                 .owner  = THIS_MODULE,
 189         },
 190 };
 191
 192 static int __init sdp2430_panel_drv_init(void)
 193 {
 194         return platform_driver_register(&sdp2430_panel_driver);
 195 }
 196
 197 static void __exit sdp2430_panel_drv_exit(void)
 198 {
 199         platform_driver_unregister(&sdp2430_panel_driver);
 200 }
 201
 202 module_init(sdp2430_panel_drv_init);
 203 module_exit(sdp2430_panel_drv_exit);