| 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 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of |
| 15 | * the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 25 | * MA 02111-1307 USA |
| 26 | */ |
| 27 | |
| 28 | #ifdef CONFIG_SYS_GPIO_BASE |
| 29 | #include <asm/io.h> |
| 30 | |
| 31 | static inline int gpio_request(unsigned gpio, const char *label) |
| 32 | { |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | static inline int gpio_free(unsigned gpio) |
| 37 | { |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static inline int gpio_get_value(unsigned gpio) |
| 42 | { |
| 43 | return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1; |
| 44 | } |
| 45 | |
| 46 | static inline void gpio_set_value(unsigned gpio, int value) |
| 47 | { |
| 48 | u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8); |
| 49 | |
| 50 | if (value) |
| 51 | tmp |= (1 << gpio%8); |
| 52 | else |
| 53 | tmp &= ~(1 << gpio%8); |
| 54 | writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8); |
| 55 | } |
| 56 | |
| 57 | static inline int gpio_direction_input(unsigned gpio) |
| 58 | { |
| 59 | gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0); |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | static inline int gpio_direction_output(unsigned gpio, int value) |
| 65 | { |
| 66 | gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1); |
| 67 | gpio_set_value(gpio, value); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static inline int gpio_is_valid(int number) |
| 73 | { |
| 74 | return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH; |
| 75 | } |
| 76 | #else |
| 77 | extern int gpio_request(unsigned gpio, const char *label); |
| 78 | extern int gpio_free(unsigned gpio); |
| 79 | extern int gpio_direction_input(unsigned gpio); |
| 80 | extern int gpio_direction_output(unsigned gpio, int value); |
| 81 | extern int gpio_get_value(unsigned gpio); |
| 82 | extern void gpio_set_value(unsigned gpio, int value); |
| 83 | extern int gpio_is_valid(int number); |
| 84 | #endif /* CONFIG_SYS_GPIO_BASE */ |