iMX28: Add PINMUX control
Taken from Linux kernel with minor modifications:
commit bf985969e27b507f734435a99df8bf745a3dbb2b
Author: Shawn Guo <shawn.guo@freescale.com>
Date: Mon Dec 20 22:57:43 2010 +0800
ARM: mxs: Add iomux support
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
diff --git a/arch/arm/include/asm/arch-mx28/iomux.h b/arch/arm/include/asm/arch-mx28/iomux.h
new file mode 100644
index 0000000..7abdf58
--- /dev/null
+++ b/arch/arm/include/asm/arch-mx28/iomux.h
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ * <armlinux@phytec.de>
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifndef __MACH_MXS_IOMUX_H__
+#define __MACH_MXS_IOMUX_H__
+
+/*
+ * IOMUX/PAD Bit field definitions
+ *
+ * PAD_BANK: 0..2 (3)
+ * PAD_PIN: 3..7 (5)
+ * PAD_MUXSEL: 8..9 (2)
+ * PAD_MA: 10..11 (2)
+ * PAD_MA_VALID: 12 (1)
+ * PAD_VOL: 13 (1)
+ * PAD_VOL_VALID: 14 (1)
+ * PAD_PULL: 15 (1)
+ * PAD_PULL_VALID: 16 (1)
+ * RESERVED: 17..31 (15)
+ */
+typedef u32 iomux_cfg_t;
+
+#define MXS_PAD_BANK_SHIFT 0
+#define MXS_PAD_BANK_MASK ((iomux_cfg_t)0x7 << MXS_PAD_BANK_SHIFT)
+#define MXS_PAD_PIN_SHIFT 3
+#define MXS_PAD_PIN_MASK ((iomux_cfg_t)0x1f << MXS_PAD_PIN_SHIFT)
+#define MXS_PAD_MUXSEL_SHIFT 8
+#define MXS_PAD_MUXSEL_MASK ((iomux_cfg_t)0x3 << MXS_PAD_MUXSEL_SHIFT)
+#define MXS_PAD_MA_SHIFT 10
+#define MXS_PAD_MA_MASK ((iomux_cfg_t)0x3 << MXS_PAD_MA_SHIFT)
+#define MXS_PAD_MA_VALID_SHIFT 12
+#define MXS_PAD_MA_VALID_MASK ((iomux_cfg_t)0x1 << MXS_PAD_MA_VALID_SHIFT)
+#define MXS_PAD_VOL_SHIFT 13
+#define MXS_PAD_VOL_MASK ((iomux_cfg_t)0x1 << MXS_PAD_VOL_SHIFT)
+#define MXS_PAD_VOL_VALID_SHIFT 14
+#define MXS_PAD_VOL_VALID_MASK ((iomux_cfg_t)0x1 << MXS_PAD_VOL_VALID_SHIFT)
+#define MXS_PAD_PULL_SHIFT 15
+#define MXS_PAD_PULL_MASK ((iomux_cfg_t)0x1 << MXS_PAD_PULL_SHIFT)
+#define MXS_PAD_PULL_VALID_SHIFT 16
+#define MXS_PAD_PULL_VALID_MASK ((iomux_cfg_t)0x1 << MXS_PAD_PULL_VALID_SHIFT)
+
+#define PAD_MUXSEL_0 0
+#define PAD_MUXSEL_1 1
+#define PAD_MUXSEL_2 2
+#define PAD_MUXSEL_GPIO 3
+
+#define PAD_4MA 0
+#define PAD_8MA 1
+#define PAD_12MA 2
+#define PAD_16MA 3
+
+#define PAD_1V8 0
+#define PAD_3V3 1
+
+#define PAD_NOPULL 0
+#define PAD_PULLUP 1
+
+#define MXS_PAD_4MA ((PAD_4MA << MXS_PAD_MA_SHIFT) | \
+ MXS_PAD_MA_VALID_MASK)
+#define MXS_PAD_8MA ((PAD_8MA << MXS_PAD_MA_SHIFT) | \
+ MXS_PAD_MA_VALID_MASK)
+#define MXS_PAD_12MA ((PAD_12MA << MXS_PAD_MA_SHIFT) | \
+ MXS_PAD_MA_VALID_MASK)
+#define MXS_PAD_16MA ((PAD_16MA << MXS_PAD_MA_SHIFT) | \
+ MXS_PAD_MA_VALID_MASK)
+
+#define MXS_PAD_1V8 ((PAD_1V8 << MXS_PAD_VOL_SHIFT) | \
+ MXS_PAD_VOL_VALID_MASK)
+#define MXS_PAD_3V3 ((PAD_3V3 << MXS_PAD_VOL_SHIFT) | \
+ MXS_PAD_VOL_VALID_MASK)
+
+#define MXS_PAD_NOPULL ((PAD_NOPULL << MXS_PAD_PULL_SHIFT) | \
+ MXS_PAD_PULL_VALID_MASK)
+#define MXS_PAD_PULLUP ((PAD_PULLUP << MXS_PAD_PULL_SHIFT) | \
+ MXS_PAD_PULL_VALID_MASK)
+
+/* generic pad control used in most cases */
+#define MXS_PAD_CTRL (MXS_PAD_4MA | MXS_PAD_3V3 | MXS_PAD_NOPULL)
+
+#define MXS_IOMUX_PAD(_bank, _pin, _muxsel, _ma, _vol, _pull) \
+ (((iomux_cfg_t)(_bank) << MXS_PAD_BANK_SHIFT) | \
+ ((iomux_cfg_t)(_pin) << MXS_PAD_PIN_SHIFT) | \
+ ((iomux_cfg_t)(_muxsel) << MXS_PAD_MUXSEL_SHIFT) | \
+ ((iomux_cfg_t)(_ma) << MXS_PAD_MA_SHIFT) | \
+ ((iomux_cfg_t)(_vol) << MXS_PAD_VOL_SHIFT) | \
+ ((iomux_cfg_t)(_pull) << MXS_PAD_PULL_SHIFT))
+
+/*
+ * A pad becomes naked, when none of mA, vol or pull
+ * validity bits is set.
+ */
+#define MXS_IOMUX_PAD_NAKED(_bank, _pin, _muxsel) \
+ MXS_IOMUX_PAD(_bank, _pin, _muxsel, 0, 0, 0)
+
+static inline unsigned int PAD_BANK(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_BANK_MASK) >> MXS_PAD_BANK_SHIFT;
+}
+
+static inline unsigned int PAD_PIN(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_PIN_MASK) >> MXS_PAD_PIN_SHIFT;
+}
+
+static inline unsigned int PAD_MUXSEL(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_MUXSEL_MASK) >> MXS_PAD_MUXSEL_SHIFT;
+}
+
+static inline unsigned int PAD_MA(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_MA_MASK) >> MXS_PAD_MA_SHIFT;
+}
+
+static inline unsigned int PAD_MA_VALID(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_MA_VALID_MASK) >> MXS_PAD_MA_VALID_SHIFT;
+}
+
+static inline unsigned int PAD_VOL(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_VOL_MASK) >> MXS_PAD_VOL_SHIFT;
+}
+
+static inline unsigned int PAD_VOL_VALID(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_VOL_VALID_MASK) >> MXS_PAD_VOL_VALID_SHIFT;
+}
+
+static inline unsigned int PAD_PULL(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_PULL_MASK) >> MXS_PAD_PULL_SHIFT;
+}
+
+static inline unsigned int PAD_PULL_VALID(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_PULL_VALID_MASK) >> MXS_PAD_PULL_VALID_SHIFT;
+}
+
+/*
+ * configures a single pad in the iomuxer
+ */
+int mxs_iomux_setup_pad(iomux_cfg_t pad);
+
+/*
+ * configures multiple pads
+ * convenient way to call the above function with tables
+ */
+int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count);
+
+#endif /* __MACH_MXS_IOMUX_H__*/