Signed-off-by: Antony Pavlov <[email protected]>
---
drivers/gpio/Kconfig | 4 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-digic.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 181 insertions(+)
create mode 100644 drivers/gpio/gpio-digic.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d5ac532..f112db8 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -9,6 +9,10 @@ menu "GPIO"
config GPIO_GENERIC
bool
+config GPIO_DIGIC
+ bool "GPIO support for Canon DIGIC"
+ depends on ARCH_DIGIC
+
config GPIO_BCM2835
bool "GPIO support for BCM2835"
depends on ARCH_BCM2835
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index adb668f..c5cf58a 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_GPIOLIB) += gpiolib.o
obj-$(CONFIG_GPIO_BCM2835) += gpio-bcm2835.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
+obj-$(CONFIG_GPIO_DIGIC) += gpio-digic.o
obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o
obj-$(CONFIG_GPIO_IMX) += gpio-imx.o
obj-$(CONFIG_GPIO_ORION) += gpio-orion.o
diff --git a/drivers/gpio/gpio-digic.c b/drivers/gpio/gpio-digic.c
new file mode 100644
index 0000000..82eef12
--- /dev/null
+++ b/drivers/gpio/gpio-digic.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2013 Antony Pavlov <[email protected]>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <errno.h>
+#include <io.h>
+#include <gpio.h>
+#include <init.h>
+
+/*
+ * See http://magiclantern.wikia.com/wiki/Register_Map#GPIO_Ports
+ */
+
+#define DIGIC_GPIO_IN_LVL 1
+#define DIGIC_GPIO_OUT_LVL 2
+#define DIGIC_GPIO_DIR 4
+#define DIGIC_GPIO_TRISTATE 8
+
+struct digic_gpio_chip {
+ void __iomem *base;
+ struct gpio_chip gc;
+};
+
+static inline uint32_t digic_gpio_readl(struct digic_gpio_chip *chip, uint32_t
offset)
+{
+ return readl(chip->base + 4 * offset);
+}
+
+static inline void digic_gpio_writel(struct digic_gpio_chip *chip, uint32_t
val,
+ uint32_t offset)
+{
+ writel(val, chip->base + 4 * offset);
+}
+
+static int digic_gpio_get_value(struct gpio_chip *gc, unsigned offset)
+{
+ struct digic_gpio_chip *chip = container_of(gc, struct digic_gpio_chip,
gc);
+
+ if (offset >= gc->ngpio)
+ return -EINVAL;
+
+ return digic_gpio_readl(chip, offset) & DIGIC_GPIO_IN_LVL;
+}
+
+static void digic_gpio_set_value(struct gpio_chip *gc, unsigned offset, int
value)
+{
+ struct digic_gpio_chip *chip = container_of(gc, struct digic_gpio_chip,
gc);
+ uint32_t t;
+
+ if (offset >= gc->ngpio)
+ return;
+
+ t = digic_gpio_readl(chip, offset);
+ /* Port direction (1 = OUT, 0 = IN) */
+ if (value) {
+ t |= DIGIC_GPIO_OUT_LVL;
+ } else {
+ t &= ~(DIGIC_GPIO_OUT_LVL);
+ }
+ digic_gpio_writel(chip, t, offset);
+}
+
+static int digic_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct digic_gpio_chip *chip = container_of(gc, struct digic_gpio_chip,
gc);
+ uint32_t t;
+
+ if (offset >= gc->ngpio)
+ return -EINVAL;
+
+ t = digic_gpio_readl(chip, offset);
+ /* Port direction (1 = OUT, 0 = IN) */
+ t &= ~(DIGIC_GPIO_DIR);
+ digic_gpio_writel(chip, t, offset);
+
+ return 0;
+}
+
+static int digic_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct digic_gpio_chip *chip = container_of(gc, struct digic_gpio_chip,
gc);
+ uint32_t t;
+
+ if (offset >= gc->ngpio)
+ return -EINVAL;
+
+ t = digic_gpio_readl(chip, offset);
+ /* Port direction (1 = OUT, 0 = IN) */
+ t |= DIGIC_GPIO_DIR;
+ digic_gpio_writel(chip, t, offset);
+
+ digic_gpio_set_value(gc, offset, value);
+
+ return 0;
+}
+
+static struct gpio_ops digic_gpio_ops = {
+ .direction_input = digic_gpio_direction_input,
+ .direction_output = digic_gpio_direction_output,
+ .get = digic_gpio_get_value,
+ .set = digic_gpio_set_value,
+};
+
+static int digic_gpio_probe(struct device_d *dev)
+{
+ struct digic_gpio_chip *chip;
+ struct resource *res;
+ resource_size_t rsize;
+ int ret = -EINVAL;
+
+ chip = xzalloc(sizeof(*chip));
+
+ res = dev_get_resource(dev, 0);
+ if (!res)
+ goto err;
+
+ rsize = resource_size(res);
+ chip->gc.ngpio = rsize / sizeof(int32_t);
+
+ chip->base = dev_request_mem_region(dev, 0);
+ chip->gc.ops = &digic_gpio_ops;
+ chip->gc.base = 0;
+
+ chip->gc.dev = dev;
+
+ ret = gpiochip_add(&chip->gc);
+ if (ret) {
+ dev_err(dev, "couldn't add gpiochip, ret = %d\n", ret);
+ goto err;
+ }
+
+ dev_info(dev, "probed gpiochip%d with base %d\n", dev->id,
chip->gc.base);
+
+ return 0;
+
+err:
+ kfree(chip);
+
+ return ret;
+}
+
+static __maybe_unused struct of_device_id digic_gpio_dt_ids[] = {
+ {
+ .compatible = "canon,digic-gpio",
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct driver_d digic_gpio_driver = {
+ .name = "digic-gpio",
+ .probe = digic_gpio_probe,
+ .of_compatible = DRV_OF_COMPAT(digic_gpio_dt_ids),
+};
+
+static int __init digic_gpio_init(void)
+{
+ return platform_driver_register(&digic_gpio_driver);
+}
+coredevice_initcall(digic_gpio_init);
--
1.8.4.rc3
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