/* * $Id: gpio.h 6693 2007-03-25 05:42:16Z ejka $ * * Copyright (C) 2007 OpenWrt.org * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __AR7_GPIO_H__ #define __AR7_GPIO_H__ #include <asm/ar7/ar7.h> #define AR7_GPIO_MAX 32 extern int gpio_request(unsigned gpio, char *label); extern void gpio_free(unsigned gpio); /* Common GPIO layer */ static inline int gpio_direction_input(unsigned gpio) { void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR); if (gpio >= AR7_GPIO_MAX) return -EINVAL; writel(readl(gpio_dir) | (1 << gpio), gpio_dir); return 0; } static inline int gpio_direction_output(unsigned gpio) { void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR); if (gpio >= AR7_GPIO_MAX) return -EINVAL; writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir); return 0; } static inline int gpio_get_value(unsigned gpio) { void __iomem *gpio_in = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT); if (gpio >= AR7_GPIO_MAX) return -EINVAL; return ((readl(gpio_in) & (1 << gpio)) != 0); } static inline void gpio_set_value(unsigned gpio, int value) { void __iomem *gpio_out = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT); volatile unsigned tmp; if (gpio >= AR7_GPIO_MAX) return; tmp = readl(gpio_out) & ~(1 << gpio); if (value) tmp |= 1 << gpio; writel(tmp, gpio_out); } static inline int gpio_to_irq(unsigned gpio) { return -EINVAL; } static inline int irq_to_gpio(unsigned irq) { return -EINVAL; } /* Board specific GPIO functions */ static inline int ar7_gpio_enable(unsigned gpio) { void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE); if (gpio >= AR7_GPIO_MAX) return -EINVAL; writel(readl(gpio_en) | (1 << gpio), gpio_en); return 0; } static inline int ar7_gpio_disable(unsigned gpio) { void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE); if (gpio >= AR7_GPIO_MAX) return -EINVAL; writel(readl(gpio_en) & ~(1 << gpio), gpio_en); return 0; } #include <asm-generic/gpio.h> #endif