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