diff options
Diffstat (limited to 'drivers/arm/gpio/gpio.c')
-rw-r--r-- | drivers/arm/gpio/gpio.c | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/drivers/arm/gpio/gpio.c b/drivers/arm/gpio/gpio.c deleted file mode 100644 index a38db948..00000000 --- a/drivers/arm/gpio/gpio.c +++ /dev/null @@ -1,132 +0,0 @@ -/* - * Copyright (c) 2014-2015, Linaro Ltd and Contributors. All rights reserved. - * Copyright (c) 2014-2015, Hisilicon Ltd and Contributors. All rights reserved. - * - * GPIO driver for PL061 - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * Redistributions of source code must retain the above copyright notice, this - * list of conditions and the following disclaimer. - * - * Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * - * Neither the name of ARM nor the names of its contributors may be used - * to endorse or promote products derived from this software without specific - * prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -#include <console.h> -#include <debug.h> -#include <errno.h> -#include <gpio.h> -#include <mmio.h> - -#define MAX_GPIO_DEVICES 32 -#define GPIOS_PER_DEV 8 -#define GPIO_DIR 0x400 - -#define BIT(nr) (1UL << (nr)) - -struct gpio_device_t { - unsigned int base[MAX_GPIO_DEVICES]; - unsigned int count; -}; - -static struct gpio_device_t gpio_dev; - -/* return 0 for failure */ -static unsigned int find_gc_base(unsigned int gpio) -{ - int gc; - - gc = gpio / GPIOS_PER_DEV; - if (gc >= gpio_dev.count) - return 0; - return gpio_dev.base[gc]; -} - -int gpio_direction_input(unsigned int gpio) -{ - unsigned int gc_base, offset, data; - - gc_base = find_gc_base(gpio); - if (!gc_base) - return -EINVAL; - offset = gpio % GPIOS_PER_DEV; - - data = mmio_read_8(gc_base + GPIO_DIR); - data &= ~(1 << offset); - mmio_write_8(gc_base + GPIO_DIR, data); - return 0; -} - -int gpio_direction_output(unsigned int gpio) -{ - unsigned int gc_base, offset, data; - - gc_base = find_gc_base(gpio); - if (!gc_base) - return -EINVAL; - offset = gpio % 8; - - data = mmio_read_8(gc_base + GPIO_DIR); - data |= 1 << offset; - mmio_write_8(gc_base + GPIO_DIR, data); - return 0; -} - -int gpio_get_value(unsigned int gpio) -{ - unsigned int gc_base, offset; - - gc_base = find_gc_base(gpio); - if (!gc_base) - return -EINVAL; - offset = gpio % 8; - - return !!mmio_read_8(gc_base + (BIT(offset + 2))); -} - -int gpio_set_value(unsigned int gpio, unsigned int value) -{ - unsigned int gc_base, offset; - - gc_base = find_gc_base(gpio); - if (!gc_base) - return -EINVAL; - offset = gpio % 8; - mmio_write_8(gc_base + (BIT(offset + 2)), !!value << offset); - return 0; -} - -int gpio_register_device(unsigned int base) -{ - int i; - if (gpio_dev.count > MAX_GPIO_DEVICES) - return -EINVAL; - for (i = 0; i < gpio_dev.count; i++) { - if (gpio_dev.base[i] == base) { - WARN("%s: duplicated gpio base\n", __func__); - return -EINVAL; - } - } - gpio_dev.base[gpio_dev.count] = base; - gpio_dev.count++; - return 0; -} |