2 * (C) Copyright 2010,2011
3 * NVIDIA Corporation <www.nvidia.com>
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <asm/arch/tegra2.h>
27 #include <asm/arch/gpio.h>
30 * Routine: gpio_config_uart
31 * Description: Force GPIO_PI3 low on Seaboard so UART4 works.
33 void gpio_config_uart(void)
36 struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
37 struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
40 /* Enable UART via GPIO_PI3 (port 8, bit 3) so serial console works */
41 val = readl(&bank->gpio_config[GPIO_PORT(gp)]);
42 val |= 1 << GPIO_BIT(gp);
43 writel(val, &bank->gpio_config[GPIO_PORT(gp)]);
45 val = readl(&bank->gpio_out[GPIO_PORT(gp)]);
46 val &= ~(1 << GPIO_BIT(gp));
47 writel(val, &bank->gpio_out[GPIO_PORT(gp)]);
49 val = readl(&bank->gpio_dir_out[GPIO_PORT(gp)]);
50 val |= 1 << GPIO_BIT(gp);
51 writel(val, &bank->gpio_dir_out[GPIO_PORT(gp)]);