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/* 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;
}
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