Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/gpio/gpio-siox.c b/drivers/gpio/gpio-siox.c
new file mode 100644
index 0000000..006a7e6
--- /dev/null
+++ b/drivers/gpio/gpio-siox.c
@@ -0,0 +1,268 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2015-2018 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
+ */
+
+#include <linux/module.h>
+#include <linux/siox.h>
+#include <linux/gpio/driver.h>
+#include <linux/of.h>
+
+struct gpio_siox_ddata {
+ struct gpio_chip gchip;
+ struct irq_chip ichip;
+ struct mutex lock;
+ u8 setdata[1];
+ u8 getdata[3];
+
+ spinlock_t irqlock;
+ u32 irq_enable;
+ u32 irq_status;
+ u32 irq_type[20];
+};
+
+/*
+ * Note that this callback only sets the value that is clocked out in the next
+ * cycle.
+ */
+static int gpio_siox_set_data(struct siox_device *sdevice, u8 status, u8 buf[])
+{
+ struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
+
+ mutex_lock(&ddata->lock);
+ buf[0] = ddata->setdata[0];
+ mutex_unlock(&ddata->lock);
+
+ return 0;
+}
+
+static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[])
+{
+ struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
+ size_t offset;
+ u32 trigger;
+
+ mutex_lock(&ddata->lock);
+
+ spin_lock_irq(&ddata->irqlock);
+
+ for (offset = 0; offset < 12; ++offset) {
+ unsigned int bitpos = 11 - offset;
+ unsigned int gpiolevel = buf[bitpos / 8] & (1 << bitpos % 8);
+ unsigned int prev_level =
+ ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
+ u32 irq_type = ddata->irq_type[offset];
+
+ if (gpiolevel) {
+ if ((irq_type & IRQ_TYPE_LEVEL_HIGH) ||
+ ((irq_type & IRQ_TYPE_EDGE_RISING) && !prev_level))
+ ddata->irq_status |= 1 << offset;
+ } else {
+ if ((irq_type & IRQ_TYPE_LEVEL_LOW) ||
+ ((irq_type & IRQ_TYPE_EDGE_FALLING) && prev_level))
+ ddata->irq_status |= 1 << offset;
+ }
+ }
+
+ trigger = ddata->irq_status & ddata->irq_enable;
+
+ spin_unlock_irq(&ddata->irqlock);
+
+ ddata->getdata[0] = buf[0];
+ ddata->getdata[1] = buf[1];
+ ddata->getdata[2] = buf[2];
+
+ mutex_unlock(&ddata->lock);
+
+ for (offset = 0; offset < 12; ++offset) {
+ if (trigger & (1 << offset)) {
+ struct irq_domain *irqdomain = ddata->gchip.irq.domain;
+ unsigned int irq = irq_find_mapping(irqdomain, offset);
+
+ /*
+ * Conceptually handle_nested_irq should call the flow
+ * handler of the irq chip. But it doesn't, so we have
+ * to clean the irq_status here.
+ */
+ spin_lock_irq(&ddata->irqlock);
+ ddata->irq_status &= ~(1 << offset);
+ spin_unlock_irq(&ddata->irqlock);
+
+ handle_nested_irq(irq);
+ }
+ }
+
+ return 0;
+}
+
+static void gpio_siox_irq_ack(struct irq_data *d)
+{
+ struct irq_chip *ic = irq_data_get_irq_chip(d);
+ struct gpio_siox_ddata *ddata =
+ container_of(ic, struct gpio_siox_ddata, ichip);
+
+ spin_lock_irq(&ddata->irqlock);
+ ddata->irq_status &= ~(1 << d->hwirq);
+ spin_unlock_irq(&ddata->irqlock);
+}
+
+static void gpio_siox_irq_mask(struct irq_data *d)
+{
+ struct irq_chip *ic = irq_data_get_irq_chip(d);
+ struct gpio_siox_ddata *ddata =
+ container_of(ic, struct gpio_siox_ddata, ichip);
+
+ spin_lock_irq(&ddata->irqlock);
+ ddata->irq_enable &= ~(1 << d->hwirq);
+ spin_unlock_irq(&ddata->irqlock);
+}
+
+static void gpio_siox_irq_unmask(struct irq_data *d)
+{
+ struct irq_chip *ic = irq_data_get_irq_chip(d);
+ struct gpio_siox_ddata *ddata =
+ container_of(ic, struct gpio_siox_ddata, ichip);
+
+ spin_lock_irq(&ddata->irqlock);
+ ddata->irq_enable |= 1 << d->hwirq;
+ spin_unlock_irq(&ddata->irqlock);
+}
+
+static int gpio_siox_irq_set_type(struct irq_data *d, u32 type)
+{
+ struct irq_chip *ic = irq_data_get_irq_chip(d);
+ struct gpio_siox_ddata *ddata =
+ container_of(ic, struct gpio_siox_ddata, ichip);
+
+ spin_lock_irq(&ddata->irqlock);
+ ddata->irq_type[d->hwirq] = type;
+ spin_unlock_irq(&ddata->irqlock);
+
+ return 0;
+}
+
+static int gpio_siox_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gpio_siox_ddata *ddata =
+ container_of(chip, struct gpio_siox_ddata, gchip);
+ int ret;
+
+ mutex_lock(&ddata->lock);
+
+ if (offset >= 12) {
+ unsigned int bitpos = 19 - offset;
+
+ ret = ddata->setdata[0] & (1 << bitpos);
+ } else {
+ unsigned int bitpos = 11 - offset;
+
+ ret = ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
+ }
+
+ mutex_unlock(&ddata->lock);
+
+ return ret;
+}
+
+static void gpio_siox_set(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct gpio_siox_ddata *ddata =
+ container_of(chip, struct gpio_siox_ddata, gchip);
+ u8 mask = 1 << (19 - offset);
+
+ mutex_lock(&ddata->lock);
+
+ if (value)
+ ddata->setdata[0] |= mask;
+ else
+ ddata->setdata[0] &= ~mask;
+
+ mutex_unlock(&ddata->lock);
+}
+
+static int gpio_siox_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ if (offset >= 12)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int gpio_siox_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ if (offset < 12)
+ return -EINVAL;
+
+ gpio_siox_set(chip, offset, value);
+ return 0;
+}
+
+static int gpio_siox_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ if (offset < 12)
+ return 1; /* input */
+ else
+ return 0; /* output */
+}
+
+static int gpio_siox_probe(struct siox_device *sdevice)
+{
+ struct gpio_siox_ddata *ddata;
+ struct gpio_irq_chip *girq;
+ struct device *dev = &sdevice->dev;
+ int ret;
+
+ ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, ddata);
+
+ mutex_init(&ddata->lock);
+ spin_lock_init(&ddata->irqlock);
+
+ ddata->gchip.base = -1;
+ ddata->gchip.can_sleep = 1;
+ ddata->gchip.parent = dev;
+ ddata->gchip.owner = THIS_MODULE;
+ ddata->gchip.get = gpio_siox_get;
+ ddata->gchip.set = gpio_siox_set;
+ ddata->gchip.direction_input = gpio_siox_direction_input;
+ ddata->gchip.direction_output = gpio_siox_direction_output;
+ ddata->gchip.get_direction = gpio_siox_get_direction;
+ ddata->gchip.ngpio = 20;
+
+ ddata->ichip.name = "siox-gpio";
+ ddata->ichip.irq_ack = gpio_siox_irq_ack;
+ ddata->ichip.irq_mask = gpio_siox_irq_mask;
+ ddata->ichip.irq_unmask = gpio_siox_irq_unmask;
+ ddata->ichip.irq_set_type = gpio_siox_irq_set_type;
+
+ girq = &ddata->gchip.irq;
+ girq->chip = &ddata->ichip;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_level_irq;
+
+ ret = devm_gpiochip_add_data(dev, &ddata->gchip, NULL);
+ if (ret)
+ dev_err(dev, "Failed to register gpio chip (%d)\n", ret);
+
+ return ret;
+}
+
+static struct siox_driver gpio_siox_driver = {
+ .probe = gpio_siox_probe,
+ .set_data = gpio_siox_set_data,
+ .get_data = gpio_siox_get_data,
+ .driver = {
+ .name = "gpio-siox",
+ },
+};
+module_siox_driver(gpio_siox_driver);
+
+MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
+MODULE_DESCRIPTION("SIOX gpio driver");
+MODULE_LICENSE("GPL v2");