GPIO: Add SPEAr GPIO driver

Tested on x600 (SPEAr600).

Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 102 insertions, 0 deletions

diff --git a/drivers/gpio/spear_gpio.c b/drivers/gpio/spear_gpio.c
new file mode 100644
index 0000000..d3c728e
--- /dev/null
+++ b/drivers/gpio/spear_gpio.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2012 Stefan Roese <sr@denx.de>
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Driver for SPEAr600 GPIO controller
+ */
+
+#include <common.h>
+#include <asm/arch/hardware.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <errno.h>
+
+static int gpio_direction(unsigned gpio,
+			  enum gpio_direction direction)
+{
+	struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
+	u32 val;
+
+	val = readl(&regs->gpiodir);
+
+	if (direction == GPIO_DIRECTION_OUT)
+		val |= 1 << gpio;
+	else
+		val &= ~(1 << gpio);
+
+	writel(val, &regs->gpiodir);
+
+	return 0;
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+	struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
+
+	writel(1 << gpio, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
+
+	return 0;
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
+	u32 val;
+
+	val = readl(&regs->gpiodata[DATA_REG_ADDR(gpio)]);
+
+	return !!val;
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	if (gpio >= SPEAR_GPIO_COUNT)
+		return -EINVAL;
+
+	return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+	return 0;
+}
+
+void gpio_toggle_value(unsigned gpio)
+{
+	gpio_set_value(gpio, !gpio_get_value(gpio));
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+	return gpio_direction(gpio, GPIO_DIRECTION_IN);
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
+
+	if (ret < 0)
+		return ret;
+
+	gpio_set_value(gpio, value);
+	return 0;
+}