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04c79cbd5f
Setting the direction and an output value should be done by First, set the desired output value. Then, switch to output. If this is done in the inverse order, like at the moment, there can be a glitch on the GPIO line while switching first the old output value and aftwards the new one. Fix this by inverting the order of the direction/set_value calls. Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Acked-by: Stefano Babic <sbabic@denx.de>
152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
/*
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* Copyright (C) 2009
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* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
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*
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* Copyright (C) 2011
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* Stefano Babic, DENX Software Engineering, <sbabic@denx.de>
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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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <errno.h>
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enum mxc_gpio_direction {
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MXC_GPIO_DIRECTION_IN,
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MXC_GPIO_DIRECTION_OUT,
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};
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#define GPIO_TO_PORT(n) (n / 32)
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/* GPIO port description */
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static unsigned long gpio_ports[] = {
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[0] = GPIO1_BASE_ADDR,
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[1] = GPIO2_BASE_ADDR,
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[2] = GPIO3_BASE_ADDR,
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#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
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defined(CONFIG_MX53) || defined(CONFIG_MX6)
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[3] = GPIO4_BASE_ADDR,
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#endif
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#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
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[4] = GPIO5_BASE_ADDR,
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[5] = GPIO6_BASE_ADDR,
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#endif
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#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
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[6] = GPIO7_BASE_ADDR,
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#endif
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};
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static int mxc_gpio_direction(unsigned int gpio,
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enum mxc_gpio_direction direction)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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struct gpio_regs *regs;
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u32 l;
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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gpio &= 0x1f;
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regs = (struct gpio_regs *)gpio_ports[port];
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l = readl(®s->gpio_dir);
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switch (direction) {
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case MXC_GPIO_DIRECTION_OUT:
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l |= 1 << gpio;
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break;
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case MXC_GPIO_DIRECTION_IN:
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l &= ~(1 << gpio);
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}
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writel(l, ®s->gpio_dir);
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return 0;
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}
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int gpio_set_value(unsigned gpio, int value)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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struct gpio_regs *regs;
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u32 l;
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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gpio &= 0x1f;
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regs = (struct gpio_regs *)gpio_ports[port];
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l = readl(®s->gpio_dr);
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if (value)
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l |= 1 << gpio;
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else
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l &= ~(1 << gpio);
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writel(l, ®s->gpio_dr);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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struct gpio_regs *regs;
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u32 val;
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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gpio &= 0x1f;
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regs = (struct gpio_regs *)gpio_ports[port];
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val = (readl(®s->gpio_psr) >> gpio) & 0x01;
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return val;
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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return 0;
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}
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int gpio_free(unsigned gpio)
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{
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return 0;
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}
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int gpio_direction_input(unsigned gpio)
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{
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return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN);
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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int ret = gpio_set_value(gpio, value);
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if (ret < 0)
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return ret;
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return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
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}
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