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56 lines
1.6 KiB
56 lines
1.6 KiB
20 years ago
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/*
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* include/asm-arm/arch-ixp2000/ixp2000-gpio.h
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*
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* Copyright (C) 2002 Intel Corporation.
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* IXP2000 GPIO in/out, edge/level detection for IRQs:
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* IRQs are generated on Falling-edge, Rising-Edge, Level-low, Level-High
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* or both Falling-edge and Rising-edge.
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* This must be called *before* the corresponding IRQ is registerd.
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* Use this instead of directly setting the GPIO registers.
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* GPIOs may also be used as GPIOs (e.g. for emulating i2c/smb)
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*/
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#ifndef _ASM_ARCH_IXP2000_GPIO_H_
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#define _ASM_ARCH_IXP2000_GPIO_H_
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#ifndef __ASSEMBLY__
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#define GPIO_OUT 0x0
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#define GPIO_IN 0x80
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#define IXP2000_GPIO_LOW 0
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#define IXP2000_GPIO_HIGH 1
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#define GPIO_NO_EDGES 0
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#define GPIO_FALLING_EDGE 1
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#define GPIO_RISING_EDGE 2
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#define GPIO_BOTH_EDGES 3
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#define GPIO_LEVEL_LOW 4
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#define GPIO_LEVEL_HIGH 8
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extern void set_GPIO_IRQ_edge(int gpio_nr, int edge);
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extern void set_GPIO_IRQ_level(int gpio_nr, int level);
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extern void gpio_line_config(int line, int style);
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static inline int gpio_line_get(int line)
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{
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return (((*IXP2000_GPIO_PLR) >> line) & 1);
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}
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static inline void gpio_line_set(int line, int value)
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{
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if (value == IXP2000_GPIO_HIGH) {
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ixp_reg_write(IXP2000_GPIO_POSR, BIT(line));
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} else if (value == IXP2000_GPIO_LOW)
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ixp_reg_write(IXP2000_GPIO_POCR, BIT(line));
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* ASM_ARCH_IXP2000_GPIO_H_ */
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