1 /*
2 * arch/arm/mach-ixp2000/include/mach/gpio.h
3 *
4 * Copyright (C) 2002 Intel Corporation.
5 *
6 * This program is free software, you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 /*
12 * IXP2000 GPIO in/out, edge/level detection for IRQs:
13 * IRQs are generated on Falling-edge, Rising-Edge, Level-low, Level-High
14 * or both Falling-edge and Rising-edge.
15 * This must be called *before* the corresponding IRQ is registerd.
16 * Use this instead of directly setting the GPIO registers.
17 * GPIOs may also be used as GPIOs (e.g. for emulating i2c/smb)
18 */
19 #ifndef __ASM_ARCH_GPIO_H
20 #define __ASM_ARCH_GPIO_H
21
22 #ifndef __ASSEMBLY__
23
24 #define GPIO_IN 0
25 #define GPIO_OUT 1
26
27 #define IXP2000_GPIO_LOW 0
28 #define IXP2000_GPIO_HIGH 1
29
30 extern void gpio_line_config(int line, int direction);
31
gpio_line_get(int line)32 static inline int gpio_line_get(int line)
33 {
34 return (((*IXP2000_GPIO_PLR) >> line) & 1);
35 }
36
gpio_line_set(int line,int value)37 static inline void gpio_line_set(int line, int value)
38 {
39 if (value == IXP2000_GPIO_HIGH) {
40 ixp2000_reg_write(IXP2000_GPIO_POSR, 1 << line);
41 } else if (value == IXP2000_GPIO_LOW) {
42 ixp2000_reg_write(IXP2000_GPIO_POCR, 1 << line);
43 }
44 }
45
46 #endif /* !__ASSEMBLY__ */
47
48 #endif /* ASM_ARCH_IXP2000_GPIO_H_ */
49