137 lines
2.5 KiB
C
137 lines
2.5 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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* SPDX-License-Identifier: GPL-2.0+
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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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