| Stefan Kristiansson | 6e560bb | 2011-11-26 19:04:49 +0000 | [diff] [blame] | 1 | /* |
| 2 | * OpenRISC gpio driver |
| 3 | * |
| 4 | * Copyright (C) 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> |
| 5 | * |
| 6 | * based on nios2 gpio driver |
| 7 | * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> |
| 8 | * |
| 9 | * when CONFIG_SYS_GPIO_BASE is not defined, board may provide |
| 10 | * its own driver. |
| 11 | * |
| Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 12 | * SPDX-License-Identifier: GPL-2.0+ |
| Stefan Kristiansson | 6e560bb | 2011-11-26 19:04:49 +0000 | [diff] [blame] | 13 | */ |
| 14 | |
| 15 | #ifdef CONFIG_SYS_GPIO_BASE |
| 16 | #include <asm/io.h> |
| 17 | |
| 18 | static inline int gpio_request(unsigned gpio, const char *label) |
| 19 | { |
| 20 | return 0; |
| 21 | } |
| 22 | |
| 23 | static inline int gpio_free(unsigned gpio) |
| 24 | { |
| 25 | return 0; |
| 26 | } |
| 27 | |
| 28 | static inline int gpio_get_value(unsigned gpio) |
| 29 | { |
| 30 | return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1; |
| 31 | } |
| 32 | |
| 33 | static inline void gpio_set_value(unsigned gpio, int value) |
| 34 | { |
| 35 | u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8); |
| 36 | |
| 37 | if (value) |
| 38 | tmp |= (1 << gpio%8); |
| 39 | else |
| 40 | tmp &= ~(1 << gpio%8); |
| 41 | writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8); |
| 42 | } |
| 43 | |
| 44 | static inline int gpio_direction_input(unsigned gpio) |
| 45 | { |
| 46 | gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0); |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | static inline int gpio_direction_output(unsigned gpio, int value) |
| 52 | { |
| 53 | gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1); |
| 54 | gpio_set_value(gpio, value); |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static inline int gpio_is_valid(int number) |
| 60 | { |
| 61 | return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH; |
| 62 | } |
| 63 | #else |
| 64 | extern int gpio_request(unsigned gpio, const char *label); |
| 65 | extern int gpio_free(unsigned gpio); |
| 66 | extern int gpio_direction_input(unsigned gpio); |
| 67 | extern int gpio_direction_output(unsigned gpio, int value); |
| 68 | extern int gpio_get_value(unsigned gpio); |
| 69 | extern void gpio_set_value(unsigned gpio, int value); |
| 70 | extern int gpio_is_valid(int number); |
| 71 | #endif /* CONFIG_SYS_GPIO_BASE */ |