diff options
Diffstat (limited to 'include/asm-arm/arch-ixp2000/gpio.h')
| -rw-r--r-- | include/asm-arm/arch-ixp2000/gpio.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/asm-arm/arch-ixp2000/gpio.h b/include/asm-arm/arch-ixp2000/gpio.h new file mode 100644 index 000000000000..84634af5cc64 --- /dev/null +++ b/include/asm-arm/arch-ixp2000/gpio.h @@ -0,0 +1,55 @@ +/* + * include/asm-arm/arch-ixp2000/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_IXP2000_GPIO_H_ +#define _ASM_ARCH_IXP2000_GPIO_H_ + +#ifndef __ASSEMBLY__ +#define GPIO_OUT 0x0 +#define GPIO_IN 0x80 + +#define IXP2000_GPIO_LOW 0 +#define IXP2000_GPIO_HIGH 1 + +#define GPIO_NO_EDGES 0 +#define GPIO_FALLING_EDGE 1 +#define GPIO_RISING_EDGE 2 +#define GPIO_BOTH_EDGES 3 +#define GPIO_LEVEL_LOW 4 +#define GPIO_LEVEL_HIGH 8 + +extern void set_GPIO_IRQ_edge(int gpio_nr, int edge); +extern void set_GPIO_IRQ_level(int gpio_nr, int level); +extern void gpio_line_config(int line, int style); + +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) { + ixp_reg_write(IXP2000_GPIO_POSR, BIT(line)); + } else if (value == IXP2000_GPIO_LOW) + ixp_reg_write(IXP2000_GPIO_POCR, BIT(line)); +} + +#endif /* !__ASSEMBLY__ */ +#endif /* ASM_ARCH_IXP2000_GPIO_H_ */ + |