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Date: Mon, 5 Oct 2015 20:09:13 +0200
From: Andreas Werner <andy@...nerandy.de>
To: linus.walleij@...aro.org
Cc: gnurou@...il.com, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, morbidrsa@...il.com,
Andreas Werner <andy@...nerandy.de>
Subject: [PATCH] gpio: Add driver for MEN 16Z127 GPIO controller
The 16Z127 is a GPIO controller on a MCB FPGA and has 32
configurable GPIOs.
The GPIOs can be configured as inputs and outputs
Signed-off-by: Andreas Werner <andy@...nerandy.de>
---
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-menz127.c | 186 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 drivers/gpio/gpio-menz127.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8949b3f..329ebc4 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -269,6 +269,12 @@ config GPIO_MB86S7X
help
Say yes here to support the GPIO controller in Fujitsu MB86S70 SoCs.
+config GPIO_MENZ127
+ tristate "MEN 16Z127 GPIO support"
+ depends on MCB
+ help
+ Say yes here to support the MEN 16Z127 GPIO Controller.
+
config GPIO_MM_LANTIQ
bool "Lantiq Memory mapped GPIOs"
depends on LANTIQ && SOC_XWAY
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index f79a7c4..2c48751 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_GPIO_MB86S7X) += gpio-mb86s7x.o
obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o
obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o
obj-$(CONFIG_GPIO_MCP23S08) += gpio-mcp23s08.o
+obj-$(CONFIG_GPIO_MENZ127) += gpio-menz127.o
obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o
obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o
obj-$(CONFIG_GPIO_MOXART) += gpio-moxart.o
diff --git a/drivers/gpio/gpio-menz127.c b/drivers/gpio/gpio-menz127.c
new file mode 100644
index 0000000..599e61a
--- /dev/null
+++ b/drivers/gpio/gpio-menz127.c
@@ -0,0 +1,186 @@
+/*
+ * MEN 16Z127 GPIO driver
+ *
+ * Copyright (C) 2015 MEN Mikroelektronik GmbH (www.men.de)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/mcb.h>
+#include <linux/gpio.h>
+#include <linux/err.h>
+
+#define MEN_Z127_CTRL 0x00
+#define MEN_Z127_PSR 0x04
+#define MEN_Z127_IRQR 0x08
+#define MEN_Z127_GPIODR 0x0c
+#define MEN_Z127_IER1 0x10
+#define MEN_Z127_IER2 0x14
+#define MEN_Z127_DBER 0x18
+#define MEN_Z127_ODER 0x1C
+
+struct men_z127_gpio {
+ struct gpio_chip chip;
+ void __iomem *reg_base;
+ struct mcb_device *mdev;
+ struct resource *mem;
+ spinlock_t lock;
+};
+#define to_men_z127_gpio(gc) container_of(gc, struct men_z127_gpio, chip)
+
+static void men_z127_mod_reg(struct gpio_chip *chip, u32 reg, unsigned gpio,
+ int val)
+{
+ struct men_z127_gpio *men_z127_gpio;
+ u32 reg_val;
+
+ men_z127_gpio = to_men_z127_gpio(chip);
+
+ spin_lock(&men_z127_gpio->lock);
+ reg_val = readl(men_z127_gpio->reg_base + reg);
+
+ if (val)
+ reg_val |= BIT(gpio);
+ else
+ reg_val &= ~BIT(gpio);
+
+ writel(reg_val, men_z127_gpio->reg_base + reg);
+ spin_unlock(&men_z127_gpio->lock);
+}
+
+static void men_z127_set_reg(struct gpio_chip *chip, u32 reg, unsigned gpio)
+{
+ men_z127_mod_reg(chip, reg, gpio, 1);
+}
+
+static void men_z127_clr_reg(struct gpio_chip *chip, u32 reg, unsigned gpio)
+{
+ men_z127_mod_reg(chip, reg, gpio, 0);
+}
+
+static int men_z127_dir_output(struct gpio_chip *chip, unsigned gpio,
+ int value)
+{
+ men_z127_set_reg(chip, MEN_Z127_GPIODR, gpio);
+ return 0;
+}
+
+static int men_z127_dir_input(struct gpio_chip *chip, unsigned gpio)
+{
+
+ men_z127_clr_reg(chip, MEN_Z127_GPIODR, gpio);
+ return 0;
+}
+
+static void men_z127_set(struct gpio_chip *chip, unsigned gpio, int value)
+{
+ if (value)
+ men_z127_set_reg(chip, MEN_Z127_CTRL, gpio);
+ else
+ men_z127_clr_reg(chip, MEN_Z127_CTRL, gpio);
+}
+
+static int men_z127_get(struct gpio_chip *chip, unsigned gpio)
+{
+ struct men_z127_gpio *men_z127_gpio;
+ u32 val;
+
+ men_z127_gpio = to_men_z127_gpio(chip);
+ val = readl(men_z127_gpio->reg_base + MEN_Z127_PSR);
+
+ return !!(val & BIT(gpio));
+}
+
+static struct gpio_chip men_z127_chip = {
+ .label = "men-z127-gpio",
+ .owner = THIS_MODULE,
+ .direction_input = men_z127_dir_input,
+ .direction_output = men_z127_dir_output,
+ .get = men_z127_get,
+ .set = men_z127_set,
+ .ngpio = 32,
+ .base = 0,
+};
+
+static int men_z127_probe(struct mcb_device *mdev,
+ const struct mcb_device_id *id)
+{
+ struct men_z127_gpio *men_z127_gpio;
+ struct device *dev = &mdev->dev;
+ struct resource *gpio_mem;
+ int ret;
+
+ men_z127_gpio = devm_kzalloc(dev, sizeof(struct men_z127_gpio),
+ GFP_KERNEL);
+ if (!men_z127_gpio)
+ return -ENOMEM;
+
+ gpio_mem = mcb_request_mem(mdev, dev_name(dev));
+ if (IS_ERR(gpio_mem)) {
+ dev_err(dev, "failed to request device memory");
+ return PTR_ERR(gpio_mem);
+ }
+
+ men_z127_gpio->reg_base = ioremap(gpio_mem->start,
+ resource_size(gpio_mem));
+ if (men_z127_gpio->reg_base == NULL) {
+ ret = -ENXIO;
+ goto err_out;
+ }
+
+ spin_lock_init(&men_z127_gpio->lock);
+
+ men_z127_chip.dev = &mdev->dev;
+ men_z127_gpio->mem = gpio_mem;
+ men_z127_gpio->chip = men_z127_chip;
+ mcb_set_drvdata(mdev, men_z127_gpio);
+
+ ret = gpiochip_add(&men_z127_gpio->chip);
+ if (ret) {
+ dev_err(dev, "failed to register MEN 16Z127 GPIO controller");
+ goto err_out;
+ }
+
+ dev_info(dev, "MEN 16Z127 GPIO driver registered");
+
+ return 0;
+
+err_out:
+ mcb_release_mem(gpio_mem);
+ return ret;
+}
+
+static void men_z127_remove(struct mcb_device *mdev)
+{
+ struct men_z127_gpio *men_z127_gpio = mcb_get_drvdata(mdev);
+
+ iounmap(men_z127_gpio->reg_base);
+ mcb_release_mem(men_z127_gpio->mem);
+}
+
+static const struct mcb_device_id men_z127_ids[] = {
+ { .device = 0x7f },
+ { }
+};
+MODULE_DEVICE_TABLE(mcb, men_z127_ids);
+
+static struct mcb_driver men_z127_driver = {
+ .driver = {
+ .name = "z127-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = men_z127_probe,
+ .remove = men_z127_remove,
+ .id_table = men_z127_ids,
+};
+module_mcb_driver(men_z127_driver);
+
+MODULE_AUTHOR("Andreas Werner <andreas.werner@....de>");
+MODULE_DESCRIPTION("MEN 16z127 GPIO Controller");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("mcb:16z127");
--
2.1.4
--
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