Add gpio driver for Actions Semi OWL family S900 SoC. Set of registers
controlling the gpio shares the same register range with pinctrl block.
GPIO registers are organized as 6 banks and each bank controls the
maximum of 32 gpios.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
drivers/gpio/Kconfig | 8 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-owl.c | 258 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 267 insertions(+)
create mode 100644 drivers/gpio/gpio-owl.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8dbb2280538d..09ceb98e2434 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -364,6 +364,14 @@ config GPIO_OMAP
help
Say yes here to enable GPIO support for TI OMAP SoCs.
+config GPIO_OWL
+ tristate "Actions OWL GPIO support"
+ default ARCH_ACTIONS
+ depends on ARCH_ACTIONS || COMPILE_TEST
+ depends on OF_GPIO
+ help
+ Say yes here to enable GPIO support for Actions OWL SoCs.
+
config GPIO_PL061
bool "PrimeCell PL061 GPIO support"
depends on ARM_AMBA
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index cccb0d40846c..b2bb11d4675f 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -91,6 +91,7 @@ obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o
obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o
obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o
obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o
+obj-$(CONFIG_GPIO_OWL) += gpio-owl.o
obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
diff --git a/drivers/gpio/gpio-owl.c b/drivers/gpio/gpio-owl.c
new file mode 100644
index 000000000000..a066c36e8a86
--- /dev/null
+++ b/drivers/gpio/gpio-owl.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL SoC's GPIO driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@xxxxxxxxxxxxxxxx>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
+
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define GPIO_OUTEN 0x0000
+#define GPIO_INEN 0x0004
+#define GPIO_DAT 0x0008
+
+#define OWL_GPIO_PORT_A 0
+#define OWL_GPIO_PORT_B 1
+#define OWL_GPIO_PORT_C 2
+#define OWL_GPIO_PORT_D 3
+#define OWL_GPIO_PORT_E 4
+#define OWL_GPIO_PORT_F 5
+
+struct owl_gpio_port {
+ const char *name;
+ unsigned int offset;
+ unsigned int pins;
+};
+
+struct owl_gpio_soc {
+ const struct owl_gpio_port *ports;
+ unsigned int num_ports;
+ const char *name;
+};
+
+struct owl_gpio {
+ struct gpio_chip gpio;
+ const struct owl_gpio_soc *soc;
+ void __iomem *base;
+};
+
+static void __iomem *owl_gpio_get_base(struct owl_gpio *gpio,
+ unsigned int *pin)
+{
+ unsigned int start = 0, i;
+
+ for (i = 0; i < gpio->soc->num_ports; i++) {
+ const struct owl_gpio_port *port = &gpio->soc->ports[i];
+
+ if (*pin >= start && *pin < start + port->pins) {
+ *pin -= start;
+ return (gpio->base + port->offset);
+ }
+
+ start += port->pins;
+ }
+
+ return NULL;
+}
+
+static int owl_gpio_request(struct gpio_chip *chip, unsigned int offset)
+{
+ struct owl_gpio *gpio = gpiochip_get_data(chip);
+ void __iomem *gpio_base = owl_gpio_get_base(gpio, &offset);
+ u32 val;
+
+ /*
+ * GPIOs have higher priority over other modules, so either setting
+ * them as OUT or IN is sufficient
+ */
+ val = readl(gpio_base + GPIO_OUTEN);
+ val |= BIT(offset);
+ writel(val, gpio_base + GPIO_OUTEN);
+
+ return 0;
+}
+
+static void owl_gpio_free(struct gpio_chip *chip, unsigned int offset)
+{
+ struct owl_gpio *gpio = gpiochip_get_data(chip);
+ void __iomem *gpio_base = owl_gpio_get_base(gpio, &offset);
+ u32 val;
+
+ /* disable gpio output */
+ val = readl(gpio_base + GPIO_OUTEN);
+ val &= ~BIT(offset);
+ writel(val, gpio_base + GPIO_OUTEN);
+
+ /* disable gpio input */
+ val = readl(gpio_base + GPIO_INEN);
+ val &= ~BIT(offset);
+ writel(val, gpio_base + GPIO_INEN);
+}
+
+static int owl_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct owl_gpio *gpio = gpiochip_get_data(chip);
+ void __iomem *gpio_base = owl_gpio_get_base(gpio, &offset);
+ u32 val;
+
+ val = readl(gpio_base + GPIO_DAT);
+
+ return !!(val & BIT(offset));
+}
+
+static void owl_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ struct owl_gpio *gpio = gpiochip_get_data(chip);
+ void __iomem *gpio_base = owl_gpio_get_base(gpio, &offset);
+ u32 val;
+
+ val = readl(gpio_base + GPIO_DAT);
+
+ if (value)
+ val |= BIT(offset);
+ else
+ val &= ~BIT(offset);
+
+ writel(val, gpio_base + GPIO_DAT);
+}
+
+static int owl_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+ struct owl_gpio *gpio = gpiochip_get_data(chip);
+ void __iomem *gpio_base = owl_gpio_get_base(gpio, &offset);
+ u32 val;
+
+ val = readl(gpio_base + GPIO_OUTEN);
+ val &= ~BIT(offset);
+ writel(val, gpio_base + GPIO_OUTEN);
+
+ val = readl(gpio_base + GPIO_INEN);
+ val |= BIT(offset);
+ writel(val, gpio_base + GPIO_INEN);
+
+ return 0;
+}
+
+static int owl_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct owl_gpio *gpio = gpiochip_get_data(chip);
+ unsigned int pin = offset;
+ void __iomem *gpio_base = owl_gpio_get_base(gpio, &pin);
+ u32 val;
+
+ val = readl(gpio_base + GPIO_INEN);
+ val &= ~BIT(pin);
+ writel(val, gpio_base + GPIO_INEN);
+
+ val = readl(gpio_base + GPIO_OUTEN);
+ val |= BIT(pin);
+ writel(val, gpio_base + GPIO_OUTEN);
+
+ owl_gpio_set(chip, offset, value);
+
+ return 0;
+}
+
+static int owl_gpio_probe(struct platform_device *pdev)
+{
+ struct owl_gpio *gpio;
+ int ret, i;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->soc = of_device_get_match_data(&pdev->dev);
+
+ gpio->base = of_iomap(pdev->dev.of_node, 0);
+ if (IS_ERR(gpio->base))
+ return PTR_ERR(gpio->base);
+
+ gpio->gpio.request = owl_gpio_request;
+ gpio->gpio.free = owl_gpio_free;
+ gpio->gpio.get = owl_gpio_get;
+ gpio->gpio.set = owl_gpio_set;
+ gpio->gpio.direction_input = owl_gpio_direction_input;
+ gpio->gpio.direction_output = owl_gpio_direction_output;
+
+ gpio->gpio.base = -1;
+ gpio->gpio.parent = &pdev->dev;
+ gpio->gpio.label = gpio->soc->name;
+ gpio->gpio.of_node = pdev->dev.of_node;
+
+ for (i = 0; i < gpio->soc->num_ports; i++)
+ gpio->gpio.ngpio += gpio->soc->ports[i].pins;
+
+ platform_set_drvdata(pdev, gpio);
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register gpiochip\n");
+ return ret;
+ }
+
+ pr_info("Initialized Actions OWL gpio driver\n");
+
+ return 0;
+}
+
+static int owl_gpio_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+#define OWL_GPIO_PORT(port, base, count) \
+ [OWL_GPIO_PORT_##port] = { \
+ .name = #port, \
+ .offset = base, \
+ .pins = count, \
+ }
+
+static const struct owl_gpio_port s900_gpio_ports[] = {
+ OWL_GPIO_PORT(A, 0x0000, 32),
+ OWL_GPIO_PORT(B, 0x000C, 32),
+ OWL_GPIO_PORT(C, 0x0018, 12),
+ OWL_GPIO_PORT(D, 0x0024, 30),
+ OWL_GPIO_PORT(E, 0x0030, 32),
+ OWL_GPIO_PORT(F, 0x00F0, 8),
+};
+
+static const struct owl_gpio_soc s900_gpio_soc = {
+ .num_ports = ARRAY_SIZE(s900_gpio_ports),
+ .ports = s900_gpio_ports,
+ .name = "s900-gpio",
+};
+
+static const struct of_device_id owl_gpio_of_match[] = {
+ { .compatible = "actions,s900-gpio", .data = &s900_gpio_soc },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, owl_gpio_of_match);
+
+static struct platform_driver owl_gpio_driver = {
+ .driver = {
+ .name = "owl-gpio",
+ .of_match_table = owl_gpio_of_match,
+ },
+ .probe = owl_gpio_probe,
+ .remove = owl_gpio_remove,
+};
+module_platform_driver(owl_gpio_driver);
+
+MODULE_AUTHOR("David Liu <liuwei@xxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Actions OWL SoCs GPIO driver");
+MODULE_LICENSE("GPL v2");
--
2.14.1
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