ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/target/linux/ath79/files/drivers/gpio/gpio-latch.c b/target/linux/ath79/files/drivers/gpio/gpio-latch.c
new file mode 100644
index 0000000..f3545a6
--- /dev/null
+++ b/target/linux/ath79/files/drivers/gpio/gpio-latch.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * GPIO latch driver
+ *
+ * Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+
+#define GPIO_LATCH_DRIVER_NAME "gpio-latch"
+#define GPIO_LATCH_LINES 9
+
+struct gpio_latch_chip {
+ struct gpio_chip gc;
+ struct mutex mutex;
+ struct mutex latch_mutex;
+ bool latch_enabled;
+ int le_gpio;
+ bool le_active_low;
+ struct gpio_desc *gpios[GPIO_LATCH_LINES];
+};
+
+static inline struct gpio_latch_chip *to_gpio_latch_chip(struct gpio_chip *gc)
+{
+ return container_of(gc, struct gpio_latch_chip, gc);
+}
+
+static void gpio_latch_lock(struct gpio_latch_chip *glc, bool enable)
+{
+ mutex_lock(&glc->mutex);
+
+ if (enable)
+ glc->latch_enabled = true;
+
+ if (glc->latch_enabled)
+ mutex_lock(&glc->latch_mutex);
+}
+
+static void gpio_latch_unlock(struct gpio_latch_chip *glc, bool disable)
+{
+ if (glc->latch_enabled)
+ mutex_unlock(&glc->latch_mutex);
+
+ if (disable)
+ glc->latch_enabled = true;
+
+ mutex_unlock(&glc->mutex);
+}
+
+static int
+gpio_latch_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ int ret;
+
+ gpio_latch_lock(glc, false);
+ ret = gpiod_get_value(glc->gpios[offset]);
+ gpio_latch_unlock(glc, false);
+
+ return ret;
+}
+
+static void
+gpio_latch_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ bool enable_latch = false;
+ bool disable_latch = false;
+
+ if (offset == glc->le_gpio) {
+ enable_latch = value ^ glc->le_active_low;
+ disable_latch = !enable_latch;
+ }
+
+ gpio_latch_lock(glc, enable_latch);
+ gpiod_set_raw_value(glc->gpios[offset], value);
+ gpio_latch_unlock(glc, disable_latch);
+}
+
+static int
+gpio_latch_direction_output(struct gpio_chip *gc, unsigned offset, int value)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ bool enable_latch = false;
+ bool disable_latch = false;
+ int ret;
+
+ if (offset == glc->le_gpio) {
+ enable_latch = value ^ glc->le_active_low;
+ disable_latch = !enable_latch;
+ }
+
+ gpio_latch_lock(glc, enable_latch);
+ ret = gpiod_direction_output_raw(glc->gpios[offset], value);
+ gpio_latch_unlock(glc, disable_latch);
+
+ return ret;
+}
+
+static int gpio_latch_probe(struct platform_device *pdev)
+{
+ struct gpio_latch_chip *glc;
+ struct gpio_chip *gc;
+ struct device *dev = &pdev->dev;
+ struct device_node *of_node = dev->of_node;
+ int i, n;
+
+ glc = devm_kzalloc(dev, sizeof(*glc), GFP_KERNEL);
+ if (!glc)
+ return -ENOMEM;
+
+ mutex_init(&glc->mutex);
+ mutex_init(&glc->latch_mutex);
+
+ n = gpiod_count(dev, NULL);
+ if (n <= 0) {
+ dev_err(dev, "failed to get gpios: %d\n", n);
+ return n;
+ } else if (n != GPIO_LATCH_LINES) {
+ dev_err(dev, "expected %d gpios\n", GPIO_LATCH_LINES);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < n; i++) {
+ glc->gpios[i] = devm_gpiod_get_index_optional(dev, NULL, i,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(glc->gpios[i])) {
+ dev_err(dev, "failed to get gpio %d: %d\n", i,
+ PTR_ERR(glc->gpios[i]));
+ return PTR_ERR(glc->gpios[i]);
+ }
+ }
+
+ glc->le_gpio = 8;
+ glc->le_active_low = gpiod_is_active_low(glc->gpios[glc->le_gpio]);
+
+ if (!glc->gpios[glc->le_gpio]) {
+ dev_err(dev, "missing required latch-enable gpio %d\n",
+ glc->le_gpio);
+ return -EINVAL;
+ }
+
+ gc = &glc->gc;
+ gc->label = GPIO_LATCH_DRIVER_NAME;
+ gc->can_sleep = true;
+ gc->base = -1;
+ gc->ngpio = GPIO_LATCH_LINES;
+ gc->get = gpio_latch_get;
+ gc->set = gpio_latch_set;
+ gc->direction_output = gpio_latch_direction_output;
+ gc->of_node = of_node;
+
+ platform_set_drvdata(pdev, glc);
+
+ i = gpiochip_add(&glc->gc);
+ if (i) {
+ dev_err(dev, "gpiochip_add() failed: %d\n", i);
+ return i;
+ }
+
+ return 0;
+}
+
+static int gpio_latch_remove(struct platform_device *pdev)
+{
+ struct gpio_latch_chip *glc = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&glc->gc);
+ return 0;
+}
+
+static const struct of_device_id gpio_latch_match[] = {
+ { .compatible = GPIO_LATCH_DRIVER_NAME },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, gpio_latch_match);
+
+static struct platform_driver gpio_latch_driver = {
+ .probe = gpio_latch_probe,
+ .remove = gpio_latch_remove,
+ .driver = {
+ .name = GPIO_LATCH_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = gpio_latch_match,
+ },
+};
+
+module_platform_driver(gpio_latch_driver);
+
+MODULE_DESCRIPTION("GPIO latch driver");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_AUTHOR("Denis Kalashnikov <denis281089@gmail.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" GPIO_LATCH_DRIVER_NAME);
diff --git a/target/linux/ath79/files/drivers/gpio/gpio-rb4xx.c b/target/linux/ath79/files/drivers/gpio/gpio-rb4xx.c
new file mode 100644
index 0000000..f802243
--- /dev/null
+++ b/target/linux/ath79/files/drivers/gpio/gpio-rb4xx.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * GPIO driver for the MikroTik RouterBoard 4xx series
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2015 Bert Vermeulen <bert@biot.com>
+ * Copyright (C) 2020 Christopher Hill <ch6574@gmail.com>
+ *
+ * This file was based on the driver for Linux 2.6.22 published by
+ * MikroTik for their RouterBoard 4xx series devices.
+ *
+ * N.B. driver probe reports "DMA mask not set" warnings which are
+ * an artifact of using a platform_driver as an MFD device child.
+ * See conversation here https://lkml.org/lkml/2020/4/28/675
+ */
+#include <linux/platform_device.h>
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#include <mfd/rb4xx-cpld.h>
+
+struct rb4xx_gpio {
+ struct rb4xx_cpld *cpld;
+ struct device *dev;
+
+ struct gpio_chip chip;
+ struct mutex lock;
+ u16 values; /* bitfield of GPIO 0-8 current values */
+};
+
+static int rb4xx_gpio_cpld_set(struct rb4xx_gpio *gpio, unsigned int offset,
+ int value)
+{
+ struct rb4xx_cpld *cpld = gpio->cpld;
+ u16 values;
+ int ret;
+
+ mutex_lock(&gpio->lock);
+ values = gpio->values;
+
+ if (value)
+ values |= BIT(offset);
+ else
+ values &= ~(BIT(offset));
+
+ if (values == gpio->values) {
+ ret = 0;
+ goto unlock;
+ }
+
+ if (offset < 8) {
+ ret = cpld->gpio_set_0_7(cpld, values & 0xff);
+ } else if (offset == 8) {
+ ret = cpld->gpio_set_8(cpld, values >> 8);
+ }
+
+ if(likely(!ret))
+ gpio->values = values;
+
+unlock:
+ mutex_unlock(&gpio->lock);
+ return ret;
+}
+
+static int rb4xx_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ return 0; /* All 9 GPIOs are out */
+}
+
+static int rb4xx_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ return -EOPNOTSUPP;
+}
+
+static int rb4xx_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ return rb4xx_gpio_cpld_set(gpiochip_get_data(chip), offset, value);
+}
+
+static int rb4xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rb4xx_gpio *gpio = gpiochip_get_data(chip);
+ int ret;
+
+ mutex_lock(&gpio->lock);
+ ret = (gpio->values >> offset) & 0x1;
+ mutex_unlock(&gpio->lock);
+
+ return ret;
+}
+
+static void rb4xx_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ rb4xx_gpio_cpld_set(gpiochip_get_data(chip), offset, value);
+}
+
+static int rb4xx_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device *parent = dev->parent;
+ struct rb4xx_gpio *gpio;
+ u32 val;
+
+ if (!parent)
+ return -ENODEV;
+
+ gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, gpio);
+ gpio->cpld = dev_get_drvdata(parent);
+ gpio->dev = dev;
+ gpio->values = 0;
+ mutex_init(&gpio->lock);
+
+ gpio->chip.label = "rb4xx-gpio";
+ gpio->chip.parent = dev;
+ gpio->chip.owner = THIS_MODULE;
+ gpio->chip.get_direction = rb4xx_gpio_get_direction;
+ gpio->chip.direction_input = rb4xx_gpio_direction_input;
+ gpio->chip.direction_output = rb4xx_gpio_direction_output;
+ gpio->chip.get = rb4xx_gpio_get;
+ gpio->chip.set = rb4xx_gpio_set;
+ gpio->chip.ngpio = 9;
+ gpio->chip.base = -1;
+ gpio->chip.can_sleep = 1;
+
+ if (!of_property_read_u32(dev->of_node, "base", &val))
+ gpio->chip.base = val;
+
+ return gpiochip_add_data(&gpio->chip, gpio);
+}
+
+static int rb4xx_gpio_remove(struct platform_device *pdev)
+{
+ struct rb4xx_gpio *gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&gpio->chip);
+ mutex_destroy(&gpio->lock);
+
+ return 0;
+}
+
+static const struct platform_device_id rb4xx_gpio_id_table[] = {
+ { "mikrotik,rb4xx-gpio", },
+ { },
+};
+MODULE_DEVICE_TABLE(platform, rb4xx_gpio_id_table);
+
+static struct platform_driver rb4xx_gpio_driver = {
+ .probe = rb4xx_gpio_probe,
+ .remove = rb4xx_gpio_remove,
+ .id_table = rb4xx_gpio_id_table,
+ .driver = {
+ .name = "rb4xx-gpio",
+ },
+};
+
+module_platform_driver(rb4xx_gpio_driver);
+
+MODULE_DESCRIPTION("Mikrotik RB4xx GPIO driver");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
+MODULE_AUTHOR("Bert Vermeulen <bert@biot.com>");
+MODULE_AUTHOR("Christopher Hill <ch6574@gmail.com");
+MODULE_LICENSE("GPL v2");