gpio.h
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上传日期:2009-04-28
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- /*
- * include/asm-arm/arch-ixp2000/gpio.h
- *
- * Copyright (C) 2002 Intel Corporation.
- *
- * This program is free software, you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- /*
- * IXP2000 GPIO in/out, edge/level detection for IRQs:
- * IRQs are generated on Falling-edge, Rising-Edge, Level-low, Level-High
- * or both Falling-edge and Rising-edge.
- * This must be called *before* the corresponding IRQ is registerd.
- * Use this instead of directly setting the GPIO registers.
- * GPIOs may also be used as GPIOs (e.g. for emulating i2c/smb)
- */
- #ifndef __ASM_ARCH_GPIO_H
- #define __ASM_ARCH_GPIO_H
- #ifndef __ASSEMBLY__
- #define GPIO_IN 0
- #define GPIO_OUT 1
- #define IXP2000_GPIO_LOW 0
- #define IXP2000_GPIO_HIGH 1
- extern void gpio_line_config(int line, int direction);
- static inline int gpio_line_get(int line)
- {
- return (((*IXP2000_GPIO_PLR) >> line) & 1);
- }
- static inline void gpio_line_set(int line, int value)
- {
- if (value == IXP2000_GPIO_HIGH) {
- ixp2000_reg_write(IXP2000_GPIO_POSR, 1 << line);
- } else if (value == IXP2000_GPIO_LOW) {
- ixp2000_reg_write(IXP2000_GPIO_POCR, 1 << line);
- }
- }
- #endif /* !__ASSEMBLY__ */
- #endif /* ASM_ARCH_IXP2000_GPIO_H_ */