| /* |
| * arch/arm/plat-orion/gpio.c |
| * |
| * Marvell Orion SoC GPIO handling. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| /* |
| * 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 <linux/bitops.h> |
| #include <asm/io.h> |
| #include <asm/arch/soc.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)); |
| } |
| |
| static 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)); |
| } |
| |
| static 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) != 0) |
| 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); |
| } |