/* * Copyright (C) 2009 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> * * 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/arch/mx31.h> #include <asm/arch/mx31-regs.h> /* GPIO port description */ static unsigned long gpio_ports[] = { [0] = GPIO1_BASE, [1] = GPIO2_BASE, [2] = GPIO3_BASE, }; int mx31_gpio_direction(unsigned int gpio, enum mx31_gpio_direction direction) { unsigned int port = gpio >> 5; u32 l; if (port >= ARRAY_SIZE(gpio_ports)) return 1; gpio &= 0x1f; l = __REG(gpio_ports[port] + GPIO_GDIR); switch (direction) { case MX31_GPIO_DIRECTION_OUT: l |= 1 << gpio; break; case MX31_GPIO_DIRECTION_IN: l &= ~(1 << gpio); } __REG(gpio_ports[port] + GPIO_GDIR) = l; return 0; } void mx31_gpio_set(unsigned int gpio, unsigned int value) { unsigned int port = gpio >> 5; u32 l; if (port >= ARRAY_SIZE(gpio_ports)) return; gpio &= 0x1f; l = __REG(gpio_ports[port] + GPIO_DR); if (value) l |= 1 << gpio; else l &= ~(1 << gpio); __REG(gpio_ports[port] + GPIO_DR) = l; } int mx31_gpio_get(unsigned int gpio) { unsigned int port = gpio >> 5; u32 l; if (port >= ARRAY_SIZE(gpio_ports)) return -1; gpio &= 0x1f; l = (__REG(gpio_ports[port] + GPIO_DR) >> gpio) & 0x01; return l; }