[ARM] 4432/5: davinci: pin mux support

Support pin multiplexing configurations driver for TI DaVinci SoC

Signed-off-by: Vladimir Barinov <vbarinov@ru.mvista.com>
Acked-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/mux.c b/arch/arm/mach-davinci/mux.c
new file mode 100644
index 000000000000..92d26bd305b7
--- /dev/null
+++ b/arch/arm/mach-davinci/mux.c
@@ -0,0 +1,41 @@
+/*
+ * DaVinci pin multiplexing configurations
+ *
+ * Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
+ *
+ * 2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+#include <asm/hardware.h>
+
+#include <asm/arch/mux.h>
+
+/* System control register offsets */
+#define PINMUX0         0x00
+#define PINMUX1         0x04
+
+static DEFINE_SPINLOCK(mux_lock);
+
+void davinci_mux_peripheral(unsigned int mux, unsigned int enable)
+{
+        u32 pinmux, muxreg = PINMUX0;
+
+        if (mux >= DAVINCI_MUX_LEVEL2) {
+                muxreg = PINMUX1;
+                mux -= DAVINCI_MUX_LEVEL2;
+        }
+
+        spin_lock(&mux_lock);
+        pinmux = davinci_readl(DAVINCI_SYSTEM_MODULE_BASE + muxreg);
+        if (enable)
+                pinmux |= (1 << mux);
+        else
+                pinmux &= ~(1 << mux);
+        davinci_writel(pinmux, DAVINCI_SYSTEM_MODULE_BASE + muxreg);
+        spin_unlock(&mux_lock);
+}