223 lines
4.9 KiB
C
223 lines
4.9 KiB
C
/*
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* arch/arm/mach-imx/gpio.c
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*
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* author: Sascha Hauer
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* Created: april 20th, 2004
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* Copyright: Synertronixx GmbH
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*
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* Common code for i.MX machines
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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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*
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*/
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#include <common.h>
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#include <errno.h>
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#include <io.h>
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#include <of.h>
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#include <gpio.h>
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#include <init.h>
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struct imx_gpio_chip {
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void __iomem *base;
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struct gpio_chip chip;
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struct imx_gpio_regs *regs;
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};
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struct imx_gpio_regs {
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unsigned int dr;
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unsigned int gdir;
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unsigned int psr;
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};
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static struct imx_gpio_regs regs_imx1 = {
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.dr = 0x1c,
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.gdir = 0x00,
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.psr = 0x24,
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};
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static struct imx_gpio_regs regs_imx31 = {
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.dr = 0x00,
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.gdir = 0x04,
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.psr = 0x08,
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};
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static void imx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
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{
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struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
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void __iomem *base = imxgpio->base;
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u32 val;
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if (!base)
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return;
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val = readl(base + imxgpio->regs->dr);
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if (value)
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val |= 1 << gpio;
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else
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val &= ~(1 << gpio);
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writel(val, base + imxgpio->regs->dr);
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}
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static int imx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
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void __iomem *base = imxgpio->base;
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u32 val;
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if (!base)
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return -EINVAL;
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val = readl(base + imxgpio->regs->gdir);
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val &= ~(1 << gpio);
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writel(val, base + imxgpio->regs->gdir);
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return 0;
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}
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static int imx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
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{
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struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
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void __iomem *base = imxgpio->base;
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u32 val;
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gpio_set_value(gpio + chip->base, value);
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val = readl(base + imxgpio->regs->gdir);
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val |= 1 << gpio;
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writel(val, base + imxgpio->regs->gdir);
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return 0;
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}
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static int imx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
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void __iomem *base = imxgpio->base;
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u32 val;
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val = readl(base + imxgpio->regs->psr);
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return val & (1 << gpio) ? 1 : 0;
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}
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static int imx_get_direction(struct gpio_chip *chip, unsigned offset)
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{
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struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
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void __iomem *base = imxgpio->base;
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u32 val = readl(base + imxgpio->regs->gdir);
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return (val & (1 << offset)) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
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}
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static struct gpio_ops imx_gpio_ops = {
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.direction_input = imx_gpio_direction_input,
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.direction_output = imx_gpio_direction_output,
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.get = imx_gpio_get_value,
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.set = imx_gpio_set_value,
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.get_direction = imx_get_direction,
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};
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static int imx_gpio_probe(struct device_d *dev)
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{
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struct resource *iores;
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struct imx_gpio_chip *imxgpio;
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struct imx_gpio_regs *regs;
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int ret;
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ret = dev_get_drvdata(dev, (const void **)®s);
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if (ret)
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return ret;
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imxgpio = xzalloc(sizeof(*imxgpio));
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iores = dev_request_mem_resource(dev, 0);
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if (IS_ERR(iores))
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return PTR_ERR(iores);
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imxgpio->base = IOMEM(iores->start);
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imxgpio->chip.ops = &imx_gpio_ops;
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if (dev->id < 0) {
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imxgpio->chip.base = of_alias_get_id(dev->device_node, "gpio");
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if (imxgpio->chip.base < 0)
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return imxgpio->chip.base;
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imxgpio->chip.base *= 32;
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} else {
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imxgpio->chip.base = dev->id * 32;
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}
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imxgpio->chip.ngpio = 32;
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imxgpio->chip.dev = dev;
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imxgpio->regs = regs;
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gpiochip_add(&imxgpio->chip);
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dev_dbg(dev, "probed gpiochip%d with base %d\n", dev->id, imxgpio->chip.base);
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return 0;
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}
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static __maybe_unused struct of_device_id imx_gpio_dt_ids[] = {
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{
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.compatible = "fsl,imx1-gpio",
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.data = ®s_imx1,
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}, {
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.compatible = "fsl,imx21-gpio",
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.data = ®s_imx1,
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}, {
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.compatible = "fsl,imx27-gpio",
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.data = ®s_imx1,
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}, {
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.compatible = "fsl,imx31-gpio",
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.data = ®s_imx31,
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}, {
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.compatible = "fsl,imx35-gpio",
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.data = ®s_imx31,
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}, {
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.compatible = "fsl,imx51-gpio",
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.data = ®s_imx31,
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}, {
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.compatible = "fsl,imx53-gpio",
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.data = ®s_imx31,
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}, {
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.compatible = "fsl,imx6q-gpio",
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.data = ®s_imx31,
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}, {
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/* sentinel */
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}
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};
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static struct platform_device_id imx_gpio_ids[] = {
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{
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.name = "imx1-gpio",
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.driver_data = (unsigned long)®s_imx1,
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}, {
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.name = "imx31-gpio",
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.driver_data = (unsigned long)®s_imx31,
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}, {
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/* sentinel */
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},
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};
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static struct driver_d imx_gpio_driver = {
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.name = "imx-gpio",
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.probe = imx_gpio_probe,
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.of_compatible = DRV_OF_COMPAT(imx_gpio_dt_ids),
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.id_table = imx_gpio_ids,
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};
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static int imx_gpio_add(void)
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{
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platform_driver_register(&imx_gpio_driver);
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return 0;
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}
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core_initcall(imx_gpio_add);
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