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/*
* (C) Copyright 2010,2011
* NVIDIA Corporation <www.nvidia.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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/io.h>
#include <asm/arch/tegra2.h>
#include <asm/arch/gpio.h>
/*
* Routine: gpio_config_uart
* Description: Force GPIO_PI3 low on Seaboard so UART4 works.
*/
void gpio_config_uart(void)
{
int gp = GPIO_PI3;
struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
u32 val;
/* Enable UART via GPIO_PI3 (port 8, bit 3) so serial console works */
val = readl(&bank->gpio_config[GPIO_PORT(gp)]);
val |= 1 << GPIO_BIT(gp);
writel(val, &bank->gpio_config[GPIO_PORT(gp)]);
val = readl(&bank->gpio_out[GPIO_PORT(gp)]);
val &= ~(1 << GPIO_BIT(gp));
writel(val, &bank->gpio_out[GPIO_PORT(gp)]);
val = readl(&bank->gpio_dir_out[GPIO_PORT(gp)]);
val |= 1 << GPIO_BIT(gp);
writel(val, &bank->gpio_dir_out[GPIO_PORT(gp)]);
}