Add the GPIO driver for Toshiba Visconti ARM SoCs.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@xxxxxxxxxxxxx>
Reviewed-by: Punit Agrawal <punit1.agrawal@xxxxxxxxxxxxx>
---
drivers/gpio/Kconfig | 10 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-visconti.c | 218 ++++++++++++++++++++++
drivers/pinctrl/visconti/pinctrl-common.c | 23 +++
4 files changed, 252 insertions(+)
create mode 100644 drivers/gpio/gpio-visconti.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 5d4de5cd6759..14151d67f0cc 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -631,6 +631,16 @@ config GPIO_VF610
help
Say yes here to support Vybrid vf610 GPIOs.
+config GPIO_VISCONTI
+ tristate "Toshiba Visconti GPIO support"
+ depends on ARCH_VISCONTI || COMPILE_TEST
+ depends on OF_GPIO
+ select GPIOLIB_IRQCHIP
+ select GPIO_GENERIC
+ select IRQ_DOMAIN_HIERARCHY
+ help
+ Say yes here to support GPIO on Tohisba Visconti.
+
config GPIO_VR41XX
tristate "NEC VR4100 series General-purpose I/O Uint support"
depends on CPU_VR41XX
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 09dada80ac34..02c9d8d83a54 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -162,6 +162,7 @@ obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o
obj-$(CONFIG_GPIO_UNIPHIER) += gpio-uniphier.o
obj-$(CONFIG_GPIO_VF610) += gpio-vf610.o
obj-$(CONFIG_GPIO_VIPERBOARD) += gpio-viperboard.o
+obj-$(CONFIG_GPIO_VISCONTI) += gpio-visconti.o
obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
obj-$(CONFIG_GPIO_VX855) += gpio-vx855.o
obj-$(CONFIG_GPIO_WCD934X) += gpio-wcd934x.o
diff --git a/drivers/gpio/gpio-visconti.c b/drivers/gpio/gpio-visconti.c
new file mode 100644
index 000000000000..0e3d19828eb1
--- /dev/null
+++ b/drivers/gpio/gpio-visconti.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Toshiba Visconti GPIO Support
+ *
+ * (C) Copyright 2020 Toshiba Electronic Devices & Storage Corporation
+ * (C) Copyright 2020 TOSHIBA CORPORATION
+ *
+ * Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@xxxxxxxxxxxxx>
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/bitops.h>
+
+/* register offset */
+#define GPIO_DIR 0x00
+#define GPIO_IDATA 0x08
+#define GPIO_ODATA 0x10
+#define GPIO_OSET 0x18
+#define GPIO_OCLR 0x20
+#define GPIO_INTMODE 0x30
+
+#define BASE_HW_IRQ 24
+
+struct visconti_gpio {
+ void __iomem *base;
+ spinlock_t lock; /* protect gpio register */
+ struct gpio_chip gpio_chip;
+ struct irq_chip irq_chip;
+};
+
+static int visconti_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct visconti_gpio *priv = gpiochip_get_data(gc);
+ u32 offset = irqd_to_hwirq(d);
+ u32 bit = BIT(offset);
+ u32 intc_type = IRQ_TYPE_EDGE_RISING;
+ u32 intmode, odata;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ odata = readl(priv->base + GPIO_ODATA);
+ intmode = readl(priv->base + GPIO_INTMODE);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ odata &= ~bit;
+ intmode &= ~bit;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ odata |= bit;
+ intmode &= ~bit;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ intmode |= bit;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ intc_type = IRQ_TYPE_LEVEL_HIGH;
+ odata &= ~bit;
+ intmode &= ~bit;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ intc_type = IRQ_TYPE_LEVEL_HIGH;
+ odata |= bit;
+ intmode &= ~bit;
+ break;
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+
+ writel(odata, priv->base + GPIO_ODATA);
+ writel(intmode, priv->base + GPIO_INTMODE);
+ irq_set_irq_type(offset, intc_type);
+
+ ret = irq_chip_set_type_parent(d, type);
+err:
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return ret;
+}
+
+static int visconti_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
+ unsigned int child,
+ unsigned int child_type,
+ unsigned int *parent,
+ unsigned int *parent_type)
+{
+ /* Interrupts 0..15 mapped to interrupts 24..39 on the GIC */
+ if (child < 16) {
+ /* All these interrupts are level high in the CPU */
+ *parent_type = IRQ_TYPE_LEVEL_HIGH;
+ *parent = child + BASE_HW_IRQ;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static void *visconti_gpio_populate_parent_fwspec(struct gpio_chip *chip,
+ unsigned int parent_hwirq,
+ unsigned int parent_type)
+{
+ struct irq_fwspec *fwspec;
+
+ fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
+ if (!fwspec)
+ return NULL;
+
+ fwspec->fwnode = chip->irq.parent_domain->fwnode;
+ fwspec->param_count = 3;
+ fwspec->param[0] = 0;
+ fwspec->param[1] = parent_hwirq;
+ fwspec->param[2] = parent_type;
+
+ return fwspec;
+}
+
+static int visconti_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct visconti_gpio *priv;
+ struct irq_chip *irq_chip;
+ struct gpio_irq_chip *girq;
+ struct irq_domain *parent;
+ struct device_node *irq_parent;
+ struct fwnode_handle *fwnode;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->lock);
+
+ priv->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ irq_parent = of_irq_find_parent(dev->of_node);
+ if (!irq_parent) {
+ dev_err(dev, "No IRQ parent node\n");
+ return -ENODEV;
+ }
+
+ parent = irq_find_host(irq_parent);
+ if (!parent) {
+ dev_err(dev, "No IRQ parent domain\n");
+ return -ENODEV;
+ }
+
+ fwnode = of_node_to_fwnode(irq_parent);
+ of_node_put(irq_parent);
+
+ ret = bgpio_init(&priv->gpio_chip, dev, 4,
+ priv->base + GPIO_IDATA,
+ priv->base + GPIO_OSET,
+ priv->base + GPIO_OCLR,
+ priv->base + GPIO_DIR,
+ NULL,
+ 0);
+ if (ret) {
+ dev_err(dev, "unable to init generic GPIO\n");
+ return ret;
+ }
+
+ irq_chip = &priv->irq_chip;
+ irq_chip->name = dev_name(dev);
+ irq_chip->irq_mask = irq_chip_mask_parent;
+ irq_chip->irq_unmask = irq_chip_unmask_parent;
+ irq_chip->irq_eoi = irq_chip_eoi_parent;
+ irq_chip->irq_set_type = visconti_gpio_irq_set_type;
+ irq_chip->flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND;
+
+ girq = &priv->gpio_chip.irq;
+ girq->chip = irq_chip;
+ girq->fwnode = fwnode;
+ girq->parent_domain = parent;
+ girq->child_to_parent_hwirq = visconti_gpio_child_to_parent_hwirq;
+ girq->populate_parent_alloc_arg = visconti_gpio_populate_parent_fwspec;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_level_irq;
+
+ ret = devm_gpiochip_add_data(dev, &priv->gpio_chip, priv);
+ if (ret) {
+ dev_err(dev, "failed to add GPIO chip\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ return ret;
+}
+
+static const struct of_device_id visconti_gpio_of_match[] = {
+ { .compatible = "toshiba,gpio-tmpv7708", },
+ { /* end of table */ }
+};
+MODULE_DEVICE_TABLE(of, visconti_gpio_of_match);
+
+static struct platform_driver visconti_gpio_driver = {
+ .probe = visconti_gpio_probe,
+ .driver = {
+ .name = "visconti_gpio",
+ .of_match_table = of_match_ptr(visconti_gpio_of_match),
+ }
+};
+module_platform_driver(visconti_gpio_driver);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Toshiba Visconti GPIO Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/visconti/pinctrl-common.c b/drivers/pinctrl/visconti/pinctrl-common.c
index 0cb10b7b4430..21c7e0d18fea 100644
--- a/drivers/pinctrl/visconti/pinctrl-common.c
+++ b/drivers/pinctrl/visconti/pinctrl-common.c
@@ -245,11 +245,34 @@ static int visconti_set_mux(struct pinctrl_dev *pctldev,
return 0;
}
+static int visconti_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin)
+{
+ struct visconti_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev);
+ const struct visconti_mux *gpio_mux = &priv->devdata->gpio_mux[pin];
+ unsigned long flags;
+ unsigned int val;
+
+ dev_dbg(priv->dev, "%s: pin = %d\n", __func__, pin);
+
+ /* update mux */
+ spin_lock_irqsave(&priv->lock, flags);
+ val = readl(priv->base + gpio_mux->offset);
+ val &= ~gpio_mux->mask;
+ val |= gpio_mux->val;
+ writel(val, priv->base + gpio_mux->offset);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
static const struct pinmux_ops visconti_pinmux_ops = {
.get_functions_count = visconti_get_functions_count,
.get_function_name = visconti_get_function_name,
.get_function_groups = visconti_get_function_groups,
.set_mux = visconti_set_mux,
+ .gpio_request_enable = visconti_gpio_request_enable,
.strict = true,
};
--
2.29.2
