[ARM] 4275/1: generic gpio layer for ixp4xx

This patch brings generic gpio layer support to ixp4xx. It creates
functions needed for gpio->irq and irq->gpio translation.

It expects and initial value to be passed to
gpio_direction_output() which has been introduced by
commit 28735a7253a6c24364765e80a5428b4a151fccc2 in Linus git tree.

Generic gpio layer is going to be used by pxa2xx_udc driver.

Signed-off-by: Milan Svoboda <msvoboda@ra.rockwell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 73 insertions, 0 deletions

diff --git a/include/asm-arm/arch-ixp4xx/gpio.h b/include/asm-arm/arch-ixp4xx/gpio.h
new file mode 100644
index 000000000000..3a4c5b8ae9e1
--- /dev/null
+++ b/include/asm-arm/arch-ixp4xx/gpio.h
@@ -0,0 +1,73 @@
+/*
+ * linux/include/asm-arm/arch-ixp4xx/gpio.h
+ *
+ * IXP4XX GPIO wrappers for arch-neutral GPIO calls
+ *
+ * Written by Milan Svoboda <msvoboda@ra.rockwell.com>
+ * Based on PXA implementation by Philipp Zabel <philipp.zabel@gmail.com>
+ *
+ * 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
+ *
+ */
+
+#ifndef __ASM_ARCH_IXP4XX_GPIO_H
+#define __ASM_ARCH_IXP4XX_GPIO_H
+
+#include <asm/hardware.h>
+
+static inline int gpio_request(unsigned gpio, const char *label)
+{
+        return 0;
+}
+
+static inline void gpio_free(unsigned gpio)
+{
+        return;
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+{
+        gpio_line_config(gpio, IXP4XX_GPIO_IN);
+        return 0;
+}
+
+static inline int gpio_direction_output(unsigned gpio, int level)
+{
+        gpio_line_set(gpio, level);
+        gpio_line_config(gpio, IXP4XX_GPIO_OUT);
+        return 0;
+}
+
+static inline int gpio_get_value(unsigned gpio)
+{
+        int value;
+
+        gpio_line_get(gpio, &value);
+
+        return value;
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+        gpio_line_set(gpio, value);
+}
+
+#include <asm-generic/gpio.h>                   /* cansleep wrappers */
+
+extern int gpio_to_irq(int gpio);
+extern int irq_to_gpio(int gpio);
+
+#endif
+