1 /* 2 * nios2 gpio driver 3 * 4 * This gpio core is described in http://nioswiki.com/GPIO 5 * bit[0] data 6 * bit[1] output enable 7 * 8 * when CONFIG_SYS_GPIO_BASE is not defined, board may provide 9 * its own driver. 10 * 11 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 */ 17 18 #ifndef _ASM_NIOS2_GPIO_H_ 19 #define _ASM_NIOS2_GPIO_H_ 20 21 #ifdef CONFIG_SYS_GPIO_BASE 22 #include <asm/io.h> 23 24 static inline int gpio_request(unsigned gpio, const char *label) 25 { 26 return 0; 27 } 28 29 static inline int gpio_free(unsigned gpio) 30 { 31 return 0; 32 } 33 34 static inline int gpio_direction_input(unsigned gpio) 35 { 36 writel(1, CONFIG_SYS_GPIO_BASE + (gpio << 2)); 37 return 0; 38 } 39 40 static inline int gpio_direction_output(unsigned gpio, int value) 41 { 42 writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2)); 43 return 0; 44 } 45 46 static inline int gpio_get_value(unsigned gpio) 47 { 48 return readl(CONFIG_SYS_GPIO_BASE + (gpio << 2)); 49 } 50 51 static inline void gpio_set_value(unsigned gpio, int value) 52 { 53 writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2)); 54 } 55 56 static inline int gpio_is_valid(int number) 57 { 58 return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH; 59 } 60 #else 61 extern int gpio_request(unsigned gpio, const char *label); 62 extern int gpio_free(unsigned gpio); 63 extern int gpio_direction_input(unsigned gpio); 64 extern int gpio_direction_output(unsigned gpio, int value); 65 extern int gpio_get_value(unsigned gpio); 66 extern void gpio_set_value(unsigned gpio, int value); 67 extern int gpio_is_valid(int number); 68 #endif /* CONFIG_SYS_GPIO_BASE */ 69 70 #endif /* _ASM_NIOS2_GPIO_H_ */ 71