summaryrefslogtreecommitdiff
path: root/drivers/gpio/spear_gpio.c
diff options
context:
space:
mode:
authorStefan Roese <sr@denx.de>2012-02-14 14:01:36 +0100
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-07-07 14:07:42 +0200
commit2cb06a4fda4e7a88c734adaec9eeb5059e50f76b (patch)
tree581488a2e1a1a20c37c5cb6ebc2a4557423608a9 /drivers/gpio/spear_gpio.c
parentef76025a99247cdb8f927a2c9f15400678dfb599 (diff)
downloadu-boot-imx-2cb06a4fda4e7a88c734adaec9eeb5059e50f76b.zip
u-boot-imx-2cb06a4fda4e7a88c734adaec9eeb5059e50f76b.tar.gz
u-boot-imx-2cb06a4fda4e7a88c734adaec9eeb5059e50f76b.tar.bz2
GPIO: Add SPEAr GPIO driver
Tested on x600 (SPEAr600). Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/gpio/spear_gpio.c')
-rw-r--r--drivers/gpio/spear_gpio.c102
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;
+}