This is support for the gpio functionality found on the Data Modul embedded
controllers
Signed-off-by: Zahari Doychev <zahari.doyc...@linux.com>
---
drivers/staging/dmec/Kconfig | 10 +-
drivers/staging/dmec/Makefile | 1 +-
drivers/staging/dmec/dmec.h | 5 +-
drivers/staging/dmec/gpio-dmec.c | 390 ++++++++++++++++++++++++++++++++-
4 files changed, 406 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/dmec/gpio-dmec.c
diff --git a/drivers/staging/dmec/Kconfig b/drivers/staging/dmec/Kconfig
index 0067b0b..9c4a8e5 100644
--- a/drivers/staging/dmec/Kconfig
+++ b/drivers/staging/dmec/Kconfig
@@ -17,3 +17,13 @@ config I2C_DMEC
To compile this driver as a module, say M here: the module will be
called i2c-dmec
+
+config GPIO_DMEC
+ tristate "Data Modul GPIO"
+ depends on MFD_DMEC && GPIOLIB
+ help
+ Say Y here to enable support for a GPIOs on a Data Module embedded
+ controller.
+
+ To compile this driver as a module, say M here: the module will be
+ called gpio-dmec
diff --git a/drivers/staging/dmec/Makefile b/drivers/staging/dmec/Makefile
index c51a37e..b71b27b 100644
--- a/drivers/staging/dmec/Makefile
+++ b/drivers/staging/dmec/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_MFD_DMEC) += dmec-core.o
obj-$(CONFIG_I2C_DMEC) += i2c-dmec.o
+obj-$(CONFIG_GPIO_DMEC) += gpio-dmec.o
diff --git a/drivers/staging/dmec/dmec.h b/drivers/staging/dmec/dmec.h
index 178937d..cc42926 100644
--- a/drivers/staging/dmec/dmec.h
+++ b/drivers/staging/dmec/dmec.h
@@ -1,6 +1,11 @@
#ifndef _LINUX_MFD_DMEC_H
#define _LINUX_MFD_DMEC_H
+struct dmec_gpio_platform_data {
+ int gpio_base;
+ int chip_num;
+};
+
struct dmec_i2c_platform_data {
u32 reg_shift; /* register offset shift value */
u32 reg_io_width; /* register io read/write width */
diff --git a/drivers/staging/dmec/gpio-dmec.c b/drivers/staging/dmec/gpio-dmec.c
new file mode 100644
index 0000000..4cefbbf
--- /dev/null
+++ b/drivers/staging/dmec/gpio-dmec.c
@@ -0,0 +1,390 @@
+/*
+ * GPIO driver for Data Modul AG Embedded Controller
+ *
+ * Copyright (C) 2016 Data Modul AG
+ *
+ * Authors: Zahari Doychev <zahari.doyc...@linux.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/gpio.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+
+#include "dmec.h"
+
+#define DMEC_GPIO_BANKS 2
+#define DMEC_GPIO_MAX_NUM 8
+#define DMEC_GPIO_BASE(x) (0x40 + 0x10 * ((x)->chip_num))
+#define DMEC_GPIO_SET_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x1)
+#define DMEC_GPIO_GET_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x1)
+#define DMEC_GPIO_CLR_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x2)
+#define DMEC_GPIO_VER_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x2)
+#define DMEC_GPIO_DIR_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x3)
+#define DMEC_GPIO_IRQTYPE_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x4)
+#define DMEC_GPIO_EVTSTA_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x6)
+#define DMEC_GPIO_IRQCFG_OFFSET(x) (DMEC_GPIO_BASE(x) + 0x8)
+#define DMEC_GPIO_NOPS_OFFSET(x) (DMEC_GPIO_BASE(x) + 0xa)
+#define DMEC_GPIO_IRQSTA_OFFSET(x) (DMEC_GPIO_BASE(x) + 0xb)
+
+#ifdef CONFIG_PM
+struct dmec_reg_ctx {
+ u32 dat;
+ u32 dir;
+ u32 imask;
+ u32 icfg[2];
+ u32 emask[2];
+};
+#endif
+
+struct dmec_gpio_priv {
+ struct regmap *regmap;
+ struct gpio_chip gpio_chip;
+ struct irq_chip irq_chip;
+ unsigned int chip_num;
+ unsigned int irq;
+ u8 ver;
+#ifdef CONFIG_PM
+ struct dmec_reg_ctx regs;
+#endif
+};
+
+static int dmec_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+ unsigned int val;
+
+ /* read get register */
+ regmap_read(regmap, DMEC_GPIO_GET_OFFSET(priv), &val);
+
+ return !!(val & BIT(offset));
+}
+
+static void dmec_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+
+ if (value)
+ regmap_write(regmap, DMEC_GPIO_SET_OFFSET(priv), BIT(offset));
+ else
+ regmap_write(regmap, DMEC_GPIO_CLR_OFFSET(priv), BIT(offset));
+}
+
+static int dmec_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
+{
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+
+ /* set pin as input */
+ regmap_update_bits(regmap, DMEC_GPIO_DIR_OFFSET(priv), BIT(offset), 0);
+
+ return 0;
+}
+
+static int dmec_gpio_direction_output(struct gpio_chip *gc, unsigned int
offset,
+ int value)
+{
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+ unsigned int val = BIT(offset);
+
+ if (value)
+ regmap_write(regmap, DMEC_GPIO_SET_OFFSET(priv), val);
+ else
+ regmap_write(regmap, DMEC_GPIO_CLR_OFFSET(priv), val);
+
+ /* set pin as output */
+ regmap_update_bits(regmap, DMEC_GPIO_DIR_OFFSET(priv), val, val);
+
+ return 0;
+}
+
+static int dmec_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+ unsigned int val;
+
+ regmap_read(regmap, DMEC_GPIO_DIR_OFFSET(priv), &val);
+
+ return !(val & BIT(offset));
+}
+
+static int dmec_gpio_pincount(struct dmec_gpio_priv *priv)
+{
+ struct regmap *regmap = priv->regmap;
+ unsigned int val;
+
+ regmap_read(regmap, DMEC_GPIO_NOPS_OFFSET(priv), &val);
+
+ /* number of pins is val + 1 */
+ return val == 0xff ? 0 : (val & 7) + 1;
+}
+
+static int dmec_gpio_get_version(struct gpio_chip *gc)
+{
+ struct device *dev = gc->parent;
+ struct dmec_gpio_priv *p = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ unsigned int v;
+
+ regmap_read(p->regmap, DMEC_GPIO_VER_OFFSET(p), &v);
+ p->ver = v;
+ dev_info(dev, "chip%u v%u.%u\n", p->chip_num, (v >> 4) & 0xf, v & 0xf);
+
+ return 0;
+}
+
+static void dmec_gpio_irq_enable(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+ int offset, mask;
+
+ offset = DMEC_GPIO_IRQCFG_OFFSET(priv) + (d->hwirq >> 2);
+ mask = BIT((d->hwirq & 3) << 1);
+
+ regmap_update_bits(regmap, offset, mask, mask);
+}
+
+static void dmec_gpio_irq_disable(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+ int offset, mask;
+
+ offset = DMEC_GPIO_IRQCFG_OFFSET(priv) + (d->hwirq >> 2);
+ mask = 3 << ((d->hwirq & 3) << 1);
+
+ regmap_update_bits(regmap, offset, mask, 0);
+}
+
+static int dmec_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dmec_gpio_priv *priv = container_of(gc, struct dmec_gpio_priv,
+ gpio_chip);
+ struct regmap *regmap = priv->regmap;
+ unsigned int offset, mask, val;
+
+ offset = DMEC_GPIO_IRQTYPE_OFFSET(priv) + (d->hwirq >> 2);
+ mask = ((d->hwirq & 3) << 1);
+
+ regmap_read(regmap, offset, &val);
+
+ val &= ~(3 << mask);
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_LEVEL_LOW:
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ val |= (1 << mask);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ val |= (2 << mask);
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ val |= (3 << mask);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_write(regmap, offset, val);
+
+ return 0;
+}
+
+static irqreturn_t dmec_gpio_irq_handler(int irq, void *dev_id)
+{
+ struct dmec_gpio_priv *p = dev_id;
+ struct irq_domain *d = p->gpio_chip.irqdomain;
+ unsigned int irqs_handled = 0;
+ unsigned int val = 0, stat = 0;
+
+ regmap_read(p->regmap, DMEC_GPIO_IRQSTA_OFFSET(p), &val);
+ stat = val;
+ while (stat) {
+ int line = __ffs(stat);
+ int child_irq = irq_find_mapping(d, line);
+
+ handle_nested_irq(child_irq);
+ stat &= ~(BIT(line));
+ irqs_handled++;
+ }
+ regmap_write(p->regmap, DMEC_GPIO_EVTSTA_OFFSET(p), val);
+
+ return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int dmec_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct dmec_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct dmec_gpio_priv *priv;
+ struct gpio_chip *gpio_chip;
+ struct irq_chip *irq_chip;
+ int ret = 0;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = dmec_get_regmap(pdev->dev.parent);
+ priv->chip_num = pdata->chip_num;
+
+ gpio_chip = &priv->gpio_chip;
+ gpio_chip->label = "gpio-dmec";
+ gpio_chip->owner = THIS_MODULE;
+ gpio_chip->parent = dev;
+ gpio_chip->label = dev_name(dev);
+ gpio_chip->can_sleep = true;
+
+ gpio_chip->base = pdata->gpio_base;
+
+ gpio_chip->direction_input = dmec_gpio_direction_input;
+ gpio_chip->direction_output = dmec_gpio_direction_output;
+ gpio_chip->get_direction = dmec_gpio_get_direction;
+ gpio_chip->get = dmec_gpio_get;
+ gpio_chip->set = dmec_gpio_set;
+ gpio_chip->ngpio = dmec_gpio_pincount(priv);
+ if (gpio_chip->ngpio == 0) {
+ dev_err(dev, "No GPIOs detected\n");
+ return -ENODEV;
+ }
+
+ dmec_gpio_get_version(gpio_chip);
+
+ irq_chip = &priv->irq_chip;
+ irq_chip->name = dev_name(dev);
+ irq_chip->irq_mask = dmec_gpio_irq_disable;
+ irq_chip->irq_unmask = dmec_gpio_irq_enable;
+ irq_chip->irq_set_type = dmec_gpio_irq_set_type;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, gpio_chip, priv);
+ if (ret) {
+ dev_err(dev, "Could not register GPIO chip\n");
+ return ret;
+ }
+
+ ret = gpiochip_irqchip_add(gpio_chip, irq_chip, 0,
+ handle_simple_irq, IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(dev, "cannot add irqchip\n");
+ return ret;
+ }
+
+ priv->irq = platform_get_irq(pdev, 0);
+ ret = devm_request_threaded_irq(dev, priv->irq,
+ NULL, dmec_gpio_irq_handler,
+ IRQF_ONESHOT | IRQF_SHARED,
+ dev_name(dev), priv);
+ if (ret) {
+ dev_err(dev, "unable to get irq: %d\n", ret);
+ return ret;
+ }
+
+ gpiochip_set_chained_irqchip(gpio_chip, irq_chip, priv->irq, NULL);
+
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+}
+
+static int dmec_gpio_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int dmec_gpio_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct dmec_gpio_priv *p = platform_get_drvdata(pdev);
+ struct regmap *regmap = p->regmap;
+ struct dmec_reg_ctx *ctx = &p->regs;
+
+ regmap_read(regmap, DMEC_GPIO_BASE(p), &ctx->dat);
+ regmap_read(regmap, DMEC_GPIO_DIR_OFFSET(p), &ctx->dir);
+ regmap_read(regmap, DMEC_GPIO_IRQCFG_OFFSET(p), &ctx->imask);
+ regmap_read(regmap, DMEC_GPIO_IRQTYPE_OFFSET(p), &ctx->emask[0]);
+ regmap_read(regmap, DMEC_GPIO_IRQTYPE_OFFSET(p) + 1, &ctx->emask[1]);
+ regmap_read(regmap, DMEC_GPIO_IRQCFG_OFFSET(p), &ctx->icfg[0]);
+ regmap_read(regmap, DMEC_GPIO_IRQCFG_OFFSET(p) + 1, &ctx->icfg[1]);
+
+ devm_free_irq(&pdev->dev, p->irq, p);
+
+ return 0;
+}
+
+static int dmec_gpio_resume(struct platform_device *pdev)
+{
+ struct dmec_gpio_priv *p = platform_get_drvdata(pdev);
+ struct regmap *regmap = p->regmap;
+ struct dmec_reg_ctx *ctx = &p->regs;
+ int ret;
+
+ regmap_write(regmap, DMEC_GPIO_BASE(p), ctx->dat);
+ regmap_write(regmap, DMEC_GPIO_DIR_OFFSET(p), ctx->dir);
+ regmap_write(regmap, DMEC_GPIO_IRQCFG_OFFSET(p), ctx->icfg[0]);
+ regmap_write(regmap, DMEC_GPIO_IRQCFG_OFFSET(p) + 1, ctx->icfg[1]);
+ regmap_write(regmap, DMEC_GPIO_IRQTYPE_OFFSET(p), ctx->emask[0]);
+ regmap_write(regmap, DMEC_GPIO_IRQTYPE_OFFSET(p) + 1, ctx->emask[1]);
+ regmap_write(regmap, DMEC_GPIO_IRQCFG_OFFSET(p), ctx->imask);
+ regmap_write(regmap, DMEC_GPIO_EVTSTA_OFFSET(p), 0xff);
+
+ ret = devm_request_threaded_irq(&pdev->dev, p->irq,
+ NULL, dmec_gpio_irq_handler,
+ IRQF_ONESHOT | IRQF_SHARED,
+ dev_name(&pdev->dev), p);
+ if (ret)
+ dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
+
+ return ret;
+}
+#else
+#define dmec_gpio_suspend NULL
+#define dmec_gpio_resume NULL
+#endif
+
+static struct platform_driver dmec_gpio_driver = {
+ .driver = {
+ .name = "dmec-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = dmec_gpio_probe,
+ .remove = dmec_gpio_remove,
+ .suspend = dmec_gpio_suspend,
+ .resume = dmec_gpio_resume,
+};
+
+module_platform_driver(dmec_gpio_driver);
+
+MODULE_DESCRIPTION("dmec gpio driver");
+MODULE_AUTHOR("Zahari Doychev <zahari.doyc...@linux.com");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dmec-gpio");
--
git-series 0.8.10
