/* * 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/io.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) != 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); }