diff options
Diffstat (limited to 'u-boot/board/goldelico/gta04/backlight.c')
| -rw-r--r-- | u-boot/board/goldelico/gta04/backlight.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/u-boot/board/goldelico/gta04/backlight.c b/u-boot/board/goldelico/gta04/backlight.c new file mode 100644 index 0000000..76b6e43 --- /dev/null +++ b/u-boot/board/goldelico/gta04/backlight.c @@ -0,0 +1,113 @@ +/* u-boot driver for the GTA04 backlight + * + * Copyright (C) 2010 by Golden Delicious Computers GmbH&Co. KG + * Author: H. Nikolaus Schaller <hns@goldelico.com> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ + +#include <common.h> +#include <asm/errno.h> +#include <asm/io.h> +#include <asm/arch/mux.h> +#include <asm/arch/sys_proto.h> +#include <asm/arch/gpio.h> +#include <asm/mach-types.h> +#include "backlight.h" + +#if defined(CONFIG_OMAP3_GTA04) + +#define GPIO_BACKLIGHT 57 /* = GPT11_PWM */ +#define GPT_BACKLIGHT OMAP34XX_GPT11 + +#elif defined(CONFIG_OMAP3_BEAGLE_HYBRID) + +#define GPIO_BACKLIGHT 145 /* = GPT10_PWM */ +#define GPT_BACKLIGHT OMAP34XX_GPT10 + +#elif defined(CONFIG_OMAP3_BEAGLE_EXPANDER) + +#define GPIO_BACKLIGHT 146 /* = GPT11_PWM (instead of UART2-TX) */ +#define GPT_BACKLIGHT OMAP34XX_GPT11 + +#else + +#error undefined CONFIG + +#endif + +#define USE_PWM 0 + +void backlight_set_level(int level) // 0..255 +{ +#if USE_PWM + struct gptimer *gpt_base = (struct gptimer *)GPT_BACKLIGHT; + // writel(value, &gpt_base->registername); +#else + omap_set_gpio_dataout(GPIO_BACKLIGHT, level >= 128); // for simplicity we just have on/off + level=(level >= 128)?255:0; +#endif + printf("lcm backlight level set to %d (0..255)\n", level); +} + +int backlight_init(void) +{ +#if USE_PWM + struct gptimer *gpt_base = (struct gptimer *)GPT_BACKLIGHT; +#if defined(CONFIG_OMAP3_GTA04) + MUX_VAL(CP(GPMC_NCS6), (IEN | PTD | DIS | M3)) /* GPT_11 - Backlight enable*/\ +#elif defined(CONFIG_OMAP3_BEAGLE_HYBRID) + MUX_VAL(CP(UART2_RTS), (IEN | PTD | DIS | M2)) /* switch to GPT10 */ +#elif defined(CONFIG_OMAP3_BEAGLE_EXPANDER) + MUX_VAL(CP(UART2_TX), (IEN | PTD | DIS | M2)) /* switch to GPT11 */ +#else +#error undefined CONFIG +#endif + // writel(value, &gpt_base->registername); + // program registers for generating a 100-1000 Hz PWM signal + // or PWM synchronized to VSYNC (to avoid flicker) + printf("did backlight_init() on PWM\n"); + +#error todo + +#else +#if defined(CONFIG_OMAP3_GTA04) + MUX_VAL(CP(GPMC_NCS6), (IEN | PTD | DIS | M4)) /*GPIO_57 - Backlight enable*/ +#elif defined(CONFIG_OMAP3_BEAGLE_HYBRID) + MUX_VAL(CP(UART2_RTS), (IEN | PTD | DIS | M4)) /*GPIO_145*/ +#elif defined(CONFIG_OMAP3_BEAGLE_EXPANDER) + MUX_VAL(CP(UART2_TX), (IEN | PTD | DIS | M4)) /*GPIO_146*/ +#else +#error undefined CONFIG +#endif + if(omap_request_gpio(GPIO_BACKLIGHT) == 0) // 0 == ok + { + omap_set_gpio_direction(GPIO_BACKLIGHT, 0); // output + printf("did backlight_init() on GPIO_%d\n", GPIO_BACKLIGHT); + } + else + { + printf("backlight_init() on GPIO_%d failed\n", GPIO_BACKLIGHT); + } + +#endif + + return 0; +} + + |