| /* |
| * OpenRISC gpio driver |
| * |
| * Copyright (C) 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> |
| * |
| * based on nios2 gpio driver |
| * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> |
| * |
| * when CONFIG_SYS_GPIO_BASE is not defined, board may provide |
| * its own driver. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #ifdef CONFIG_SYS_GPIO_BASE |
| #include <asm/io.h> |
| |
| static inline int gpio_request(unsigned gpio, const char *label) |
| { |
| return 0; |
| } |
| |
| static inline int gpio_free(unsigned gpio) |
| { |
| return 0; |
| } |
| |
| static inline int gpio_get_value(unsigned gpio) |
| { |
| return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1; |
| } |
| |
| static inline void gpio_set_value(unsigned gpio, int value) |
| { |
| u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8); |
| |
| if (value) |
| tmp |= (1 << gpio%8); |
| else |
| tmp &= ~(1 << gpio%8); |
| writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8); |
| } |
| |
| static inline int gpio_direction_input(unsigned gpio) |
| { |
| gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0); |
| |
| return 0; |
| } |
| |
| static inline int gpio_direction_output(unsigned gpio, int value) |
| { |
| gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1); |
| gpio_set_value(gpio, value); |
| |
| return 0; |
| } |
| |
| static inline int gpio_is_valid(int number) |
| { |
| return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH; |
| } |
| #else |
| extern int gpio_request(unsigned gpio, const char *label); |
| extern int gpio_free(unsigned gpio); |
| extern int gpio_direction_input(unsigned gpio); |
| extern int gpio_direction_output(unsigned gpio, int value); |
| extern int gpio_get_value(unsigned gpio); |
| extern void gpio_set_value(unsigned gpio, int value); |
| extern int gpio_is_valid(int number); |
| #endif /* CONFIG_SYS_GPIO_BASE */ |
