i.MX31: Add some enums and a couple helper functions to make dealing with pin muxing and pad configuration a bit more sane. Convert any existing code which changes mux/pad settings to use helpers.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25698 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 50 insertions, 0 deletions

diff --git a/firmware/target/arm/imx31/iomuxc-imx31.c b/firmware/target/arm/imx31/iomuxc-imx31.c
new file mode 100644
index 0000000000..876b8b2a9c
--- /dev/null
+++ b/firmware/target/arm/imx31/iomuxc-imx31.c
@@ -0,0 +1,50 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (c) 2010 Michael Sevakis
+ *
+ * i.MX31 IOMUXC helper routines
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "system.h"
+#include "iomuxc-imx31.h"
+
+
+/* Set the pin multiplexing configuration (functional, GPIO, etc.) */
+void iomuxc_set_pin_mux(enum IMX31_IOMUXC_PINS pin,
+                        unsigned long mux)
+{
+    unsigned long index = pin / 4;
+    unsigned int shift = 8*(pin % 4);
+
+    imx31_regmod32((unsigned long *)(IOMUXC_BASE_ADDR + 0xc) + index,
+                   mux << shift, IOMUXC_MUX_MASK << shift);
+}
+
+
+/* Set the pin pad configuration (keeper, drive strength, etc.) */
+void iomuxc_set_pad_config(enum IMX31_IOMUXC_PINS pin,
+                           unsigned long config)
+{
+    unsigned long padoffs = pin + 2;
+    unsigned long index = padoffs / 3;
+    unsigned int shift = 10*(padoffs % 3);
+
+    imx31_regmod32((unsigned long *)(IOMUXC_BASE_ADDR + 0x154) + index,
+                   config << shift, IOMUXC_PAD_MASK << shift);
+}