diff options
Diffstat (limited to 'u-boot/drivers/gpio/kw_gpio.c')
| -rw-r--r-- | u-boot/drivers/gpio/kw_gpio.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/u-boot/drivers/gpio/kw_gpio.c b/u-boot/drivers/gpio/kw_gpio.c new file mode 100644 index 0000000..56383c2 --- /dev/null +++ b/u-boot/drivers/gpio/kw_gpio.c @@ -0,0 +1,165 @@ +/* + * arch/arm/plat-orion/gpio.c + * + * Marvell Orion SoC GPIO handling. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +/* + * Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver. + * Removed orion_gpiochip struct and kernel level irq handling. + * + * Dieter Kiermaier dk-arm-linux@gmx.de + */ + +#include <common.h> +#include <asm/bitops.h> +#include <asm/arch/kirkwood.h> +#include <asm/arch/gpio.h> + +static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)]; +static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)]; + +void __set_direction(unsigned pin, int input) +{ + u32 u; + + u = readl(GPIO_IO_CONF(pin)); + if (input) + u |= 1 << (pin & 31); + else + u &= ~(1 << (pin & 31)); + writel(u, GPIO_IO_CONF(pin)); + + u = readl(GPIO_IO_CONF(pin)); +} + +void __set_level(unsigned pin, int high) +{ + u32 u; + + u = readl(GPIO_OUT(pin)); + if (high) + u |= 1 << (pin & 31); + else + u &= ~(1 << (pin & 31)); + writel(u, GPIO_OUT(pin)); +} + +void __set_blinking(unsigned pin, int blink) +{ + u32 u; + + u = readl(GPIO_BLINK_EN(pin)); + if (blink) + u |= 1 << (pin & 31); + else + u &= ~(1 << (pin & 31)); + writel(u, GPIO_BLINK_EN(pin)); +} + +int kw_gpio_is_valid(unsigned pin, int mode) +{ + if (pin < GPIO_MAX) { + if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input)) + goto err_out; + + if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output)) + goto err_out; + return 0; + } + +err_out: + printf("%s: invalid GPIO %d\n", __func__, pin); + return 1; +} + +void kw_gpio_set_valid(unsigned pin, int mode) +{ + if (mode == 1) + mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK; + if (mode & GPIO_INPUT_OK) + __set_bit(pin, gpio_valid_input); + else + __clear_bit(pin, gpio_valid_input); + if (mode & GPIO_OUTPUT_OK) + __set_bit(pin, gpio_valid_output); + else + __clear_bit(pin, gpio_valid_output); +} +/* + * GENERIC_GPIO primitives. + */ +int kw_gpio_direction_input(unsigned pin) +{ + if (!kw_gpio_is_valid(pin, GPIO_INPUT_OK)) + return 1; + + /* Configure GPIO direction. */ + __set_direction(pin, 1); + + return 0; +} + +int kw_gpio_direction_output(unsigned pin, int value) +{ + if (kw_gpio_is_valid(pin, GPIO_OUTPUT_OK) != 0) + { + printf("%s: invalid GPIO %d\n", __func__, pin); + return 1; + } + + __set_blinking(pin, 0); + + /* Configure GPIO output value. */ + __set_level(pin, value); + + /* Configure GPIO direction. */ + __set_direction(pin, 0); + + return 0; +} + +int kw_gpio_get_value(unsigned pin) +{ + int val; + + if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31))) + val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin)); + else + val = readl(GPIO_OUT(pin)); + + return (val >> (pin & 31)) & 1; +} + +void kw_gpio_set_value(unsigned pin, int value) +{ + /* Configure GPIO output value. */ + __set_level(pin, value); +} + +void kw_gpio_set_blink(unsigned pin, int blink) +{ + /* Set output value to zero. */ + __set_level(pin, 0); + + /* Set blinking. */ + __set_blinking(pin, blink); +} |