1 /* 2 * (C) Copyright 2010,2011 3 * NVIDIA Corporation <www.nvidia.com> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 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. 12 * 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. 17 * 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, 21 * MA 02111-1307 USA 22 */ 23 24 #include <common.h> 25 #include <asm/io.h> 26 #include <asm/arch/tegra2.h> 27 #include <asm/arch/gpio.h> 28 29 /* 30 * Routine: gpio_config_uart 31 * Description: Force GPIO_PI3 low on Seaboard so UART4 works. 32 */ 33 void gpio_config_uart(void) 34 { 35 int gp = GPIO_PI3; 36 struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE; 37 struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)]; 38 u32 val; 39 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)]); 44 45 val = readl(&bank->gpio_out[GPIO_PORT(gp)]); 46 val &= ~(1 << GPIO_BIT(gp)); 47 writel(val, &bank->gpio_out[GPIO_PORT(gp)]); 48 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)]); 52 } 53