gpio: add lpc18xx gpio driver

Driver for the GPIO block found on NXP LPC18xx/43xx devices.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index caefe80..c221125 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -230,6 +230,14 @@ config GPIO_LOONGSON
        help
          driver for GPIO functionality on Loongson-2F/3A/3B processors.
 
+config GPIO_LPC18XX
+       bool "NXP LPC18XX/43XX GPIO support"
+       default y if ARCH_LPC18XX
+       depends on OF_GPIO && (ARCH_LPC18XX || COMPILE_TEST)
+       help
+         Select this option to enable GPIO driver for
+         NXP LPC18XX/43XX devices.
+
 config GPIO_LYNXPOINT
        tristate "Intel Lynxpoint GPIO support"
        depends on ACPI && X86

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index f71bb97..7b7f5d2 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_ARCH_KS8695)     += gpio-ks8695.o
 obj-$(CONFIG_GPIO_INTEL_MID)   += gpio-intel-mid.o
 obj-$(CONFIG_GPIO_LOONGSON)    += gpio-loongson.o
 obj-$(CONFIG_GPIO_LP3943)      += gpio-lp3943.o
+obj-$(CONFIG_GPIO_LPC18XX)     += gpio-lpc18xx.o
 obj-$(CONFIG_ARCH_LPC32XX)     += gpio-lpc32xx.o
 obj-$(CONFIG_GPIO_LYNXPOINT)   += gpio-lynxpoint.o
 obj-$(CONFIG_GPIO_MAX730X)     += gpio-max730x.o

diff --git a/drivers/gpio/gpio-lpc18xx.c b/drivers/gpio/gpio-lpc18xx.c
new file mode 100644 (file)
index 0000000..eb68603
--- /dev/null
+++ b/drivers/gpio/gpio-lpc18xx.c
@@ -0,0 +1,180 @@
+/*
+ * GPIO driver for NXP LPC18xx/43xx.
+ *
+ * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+
+/* LPC18xx GPIO register offsets */
+#define LPC18XX_REG_DIR(n)     (0x2000 + n * sizeof(u32))
+
+#define LPC18XX_MAX_PORTS      8
+#define LPC18XX_PINS_PER_PORT  32
+
+struct lpc18xx_gpio_chip {
+       struct gpio_chip gpio;
+       void __iomem *base;
+       struct clk *clk;
+       spinlock_t lock;
+};
+
+static inline struct lpc18xx_gpio_chip *to_lpc18xx_gpio(struct gpio_chip *chip)
+{
+       return container_of(chip, struct lpc18xx_gpio_chip, gpio);
+}
+
+static int lpc18xx_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+       return pinctrl_request_gpio(offset);
+}
+
+static void lpc18xx_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+       pinctrl_free_gpio(offset);
+}
+
+static void lpc18xx_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+       struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip);
+       writeb(value ? 1 : 0, gc->base + offset);
+}
+
+static int lpc18xx_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+       struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip);
+       return !!readb(gc->base + offset);
+}
+
+static int lpc18xx_gpio_direction(struct gpio_chip *chip, unsigned offset,
+                                 bool out)
+{
+       struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip);
+       unsigned long flags;
+       u32 port, pin, dir;
+
+       port = offset / LPC18XX_PINS_PER_PORT;
+       pin  = offset % LPC18XX_PINS_PER_PORT;
+
+       spin_lock_irqsave(&gc->lock, flags);
+       dir = readl(gc->base + LPC18XX_REG_DIR(port));
+       if (out)
+               dir |= BIT(pin);
+       else
+               dir &= ~BIT(pin);
+       writel(dir, gc->base + LPC18XX_REG_DIR(port));
+       spin_unlock_irqrestore(&gc->lock, flags);
+
+       return 0;
+}
+
+static int lpc18xx_gpio_direction_input(struct gpio_chip *chip,
+                                       unsigned offset)
+{
+       return lpc18xx_gpio_direction(chip, offset, false);
+}
+
+static int lpc18xx_gpio_direction_output(struct gpio_chip *chip,
+                                        unsigned offset, int value)
+{
+       lpc18xx_gpio_set(chip, offset, value);
+       return lpc18xx_gpio_direction(chip, offset, true);
+}
+
+static struct gpio_chip lpc18xx_chip = {
+       .label                  = "lpc18xx/43xx-gpio",
+       .request                = lpc18xx_gpio_request,
+       .free                   = lpc18xx_gpio_free,
+       .direction_input        = lpc18xx_gpio_direction_input,
+       .direction_output       = lpc18xx_gpio_direction_output,
+       .set                    = lpc18xx_gpio_set,
+       .get                    = lpc18xx_gpio_get,
+       .ngpio                  = LPC18XX_MAX_PORTS * LPC18XX_PINS_PER_PORT,
+       .owner                  = THIS_MODULE,
+};
+
+static int lpc18xx_gpio_probe(struct platform_device *pdev)
+{
+       struct lpc18xx_gpio_chip *gc;
+       struct resource *res;
+       int ret;
+
+       gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
+       if (!gc)
+               return -ENOMEM;
+
+       gc->gpio = lpc18xx_chip;
+       platform_set_drvdata(pdev, gc);
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       gc->base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(gc->base))
+               return PTR_ERR(gc->base);
+
+       gc->clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(gc->clk)) {
+               dev_err(&pdev->dev, "input clock not found\n");
+               return PTR_ERR(gc->clk);
+       }
+
+       ret = clk_prepare_enable(gc->clk);
+       if (ret) {
+               dev_err(&pdev->dev, "unable to enable clock\n");
+               return ret;
+       }
+
+       spin_lock_init(&gc->lock);
+
+       gc->gpio.dev = &pdev->dev;
+
+       ret = gpiochip_add(&gc->gpio);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to add gpio chip\n");
+               clk_disable_unprepare(gc->clk);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int lpc18xx_gpio_remove(struct platform_device *pdev)
+{
+       struct lpc18xx_gpio_chip *gc = platform_get_drvdata(pdev);
+
+       gpiochip_remove(&gc->gpio);
+       clk_disable_unprepare(gc->clk);
+
+       return 0;
+}
+
+static const struct of_device_id lpc18xx_gpio_match[] = {
+       { .compatible = "nxp,lpc1850-gpio" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, lpc18xx_gpio_match);
+
+static struct platform_driver lpc18xx_gpio_driver = {
+       .probe  = lpc18xx_gpio_probe,
+       .remove = lpc18xx_gpio_remove,
+       .driver = {
+               .name           = "lpc18xx-gpio",
+               .of_match_table = lpc18xx_gpio_match,
+       },
+};
+module_platform_driver(lpc18xx_gpio_driver);
+
+MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
+MODULE_DESCRIPTION("GPIO driver for LPC18xx/43xx");
+MODULE_LICENSE("GPL v2");