117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/*
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* $Id: gpio.h 6693 2007-03-25 05:42:16Z ejka $
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*
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* Copyright (C) 2007 OpenWrt.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __AR7_GPIO_H__
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#define __AR7_GPIO_H__
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#include <asm/ar7/ar7.h>
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#define AR7_GPIO_MAX 32
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extern int gpio_request(unsigned gpio, char *label);
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extern void gpio_free(unsigned gpio);
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/* Common GPIO layer */
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static inline int gpio_direction_input(unsigned gpio)
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{
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void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
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if (gpio >= AR7_GPIO_MAX)
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return -EINVAL;
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writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
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return 0;
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}
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static inline int gpio_direction_output(unsigned gpio)
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{
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void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
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if (gpio >= AR7_GPIO_MAX)
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return -EINVAL;
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writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
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return 0;
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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void __iomem *gpio_in = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
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if (gpio >= AR7_GPIO_MAX)
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return -EINVAL;
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return ((readl(gpio_in) & (1 << gpio)) != 0);
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}
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static inline void gpio_set_value(unsigned gpio, int value)
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{
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void __iomem *gpio_out = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
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volatile unsigned tmp;
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if (gpio >= AR7_GPIO_MAX)
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return;
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tmp = readl(gpio_out) & ~(1 << gpio);
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if (value)
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tmp |= 1 << gpio;
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writel(tmp, gpio_out);
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}
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static inline int gpio_to_irq(unsigned gpio)
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{
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return -EINVAL;
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}
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static inline int irq_to_gpio(unsigned irq)
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{
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return -EINVAL;
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}
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/* Board specific GPIO functions */
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static inline int ar7_gpio_enable(unsigned gpio)
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{
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void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
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if (gpio >= AR7_GPIO_MAX)
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return -EINVAL;
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writel(readl(gpio_en) | (1 << gpio), gpio_en);
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return 0;
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}
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static inline int ar7_gpio_disable(unsigned gpio)
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{
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void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
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if (gpio >= AR7_GPIO_MAX)
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return -EINVAL;
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writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
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return 0;
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}
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#include <asm-generic/gpio.h>
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#endif
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