141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/*
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* Copyright (C) 2013, 2014 Antony Pavlov <antonynpavlov@gmail.com>
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*
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* Based on Linux JZ4740 platform GPIO support:
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* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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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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*/
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#include <common.h>
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#include <init.h>
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#include <io.h>
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#include <gpio.h>
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#include <malloc.h>
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#define JZ_REG_GPIO_PIN 0x00
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#define JZ_REG_GPIO_DATA 0x10
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#define JZ_REG_GPIO_DATA_SET 0x14
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#define JZ_REG_GPIO_DATA_CLEAR 0x18
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#define JZ_REG_GPIO_DIRECTION 0x60
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#define JZ_REG_GPIO_DIRECTION_SET 0x64
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#define JZ_REG_GPIO_DIRECTION_CLEAR 0x68
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#define GPIO_TO_BIT(gpio) BIT(gpio & 0x1f)
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#define CHIP_TO_REG(chip, reg) (gpio_chip_to_jz4740_gpio_chip(chip)->base + (reg))
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struct jz4740_gpio_chip {
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void __iomem *base;
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struct gpio_chip chip;
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};
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static inline struct jz4740_gpio_chip *gpio_chip_to_jz4740_gpio_chip(struct gpio_chip *chip)
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{
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return container_of(chip, struct jz4740_gpio_chip, chip);
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}
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static int jz4740_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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return !!(readl(CHIP_TO_REG(chip, JZ_REG_GPIO_PIN)) & BIT(gpio));
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}
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static void jz4740_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
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{
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uint32_t __iomem *reg = CHIP_TO_REG(chip, JZ_REG_GPIO_DATA_SET);
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reg += !value;
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writel(BIT(gpio), reg);
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}
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static int jz4740_gpio_get_direction(struct gpio_chip *chip, unsigned gpio)
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{
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if (readl(CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION)) & BIT(gpio))
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return GPIOF_DIR_OUT;
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return GPIOF_DIR_IN;
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}
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static int jz4740_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_CLEAR));
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return 0;
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}
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static int jz4740_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
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int value)
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{
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jz4740_gpio_set_value(chip, gpio, value);
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writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_SET));
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return 0;
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}
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static struct gpio_ops jz4740_gpio_ops = {
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.direction_input = jz4740_gpio_direction_input,
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.direction_output = jz4740_gpio_direction_output,
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.get_direction = jz4740_gpio_get_direction,
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.get = jz4740_gpio_get_value,
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.set = jz4740_gpio_set_value,
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};
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static int jz4740_gpio_probe(struct device_d *dev)
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{
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void __iomem *base;
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struct jz4740_gpio_chip *jz4740_gpio;
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int ret;
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base = dev_request_mem_region(dev, 0);
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if (!base) {
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dev_err(dev, "could not get memory region\n");
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return -ENODEV;
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}
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jz4740_gpio = xzalloc(sizeof(*jz4740_gpio));
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jz4740_gpio->base = base;
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jz4740_gpio->chip.ops = &jz4740_gpio_ops;
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jz4740_gpio->chip.base = -1; /* dev->id * 32; */
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jz4740_gpio->chip.ngpio = 32;
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jz4740_gpio->chip.dev = dev;
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ret = gpiochip_add(&jz4740_gpio->chip);
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if (ret) {
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dev_err(dev, "couldn't add gpiochip\n");
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free(jz4740_gpio);
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return ret;
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}
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dev_dbg(dev, "probed gpiochip%d with base %d\n",
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dev->id, jz4740_gpio->chip.base);
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return 0;
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}
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static __maybe_unused struct of_device_id jz4740_gpio_dt_ids[] = {
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{
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.compatible = "ingenic,jz4740-gpio",
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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 jz4740_gpio_driver = {
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.name = "jz4740-gpio",
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.probe = jz4740_gpio_probe,
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.of_compatible = DRV_OF_COMPAT(jz4740_gpio_dt_ids),
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};
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static int jz4740_gpio_init(void)
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{
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return platform_driver_register(&jz4740_gpio_driver);
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}
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coredevice_initcall(jz4740_gpio_init);
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