ARM: mxs: Add iomux support

MXS-based SoCs implements iomux functions in block PINCTRL.
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/mach-mxs/include/mach/iomux.h

+/*
+ * 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)
+
+#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__*/

arch/arm/mach-mxs/iomux.c

+/*
+ * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ *                       <armlinux@phytec.de>
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/gpio.h>
+
+#include <asm/mach/map.h>
+
+#include <mach/mxs.h>
+#include <mach/iomux.h>
+
+/*
+ * configures a single pad in the iomuxer
+ */
+int mxs_iomux_setup_pad(iomux_cfg_t pad)
+{
+	u32 reg, ofs, bp, bm;
+	void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);
+
+	/* muxsel */
+	ofs = 0x100;
+	ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
+	bp = PAD_PIN(pad) % 16 * 2;
+	bm = 0x3 << bp;
+	reg = __raw_readl(iomux_base + ofs);
+	reg &= ~bm;
+	reg |= PAD_MUXSEL(pad) << bp;
+	__raw_writel(reg, iomux_base + ofs);
+
+	/* drive */
+	ofs = cpu_is_mx23() ? 0x200 : 0x300;
+	ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
+	/* mA */
+	if (PAD_MA_VALID(pad)) {
+		bp = PAD_PIN(pad) % 8 * 4;
+		bm = 0x3 << bp;
+		reg = __raw_readl(iomux_base + ofs);
+		reg &= ~bm;
+		reg |= PAD_MA(pad) << bp;
+		__raw_writel(reg, iomux_base + ofs);
+	}
+	/* vol */
+	if (PAD_VOL_VALID(pad)) {
+		bp = PAD_PIN(pad) % 8 * 4 + 2;
+		if (PAD_VOL(pad))
+			__mxs_setl(1 << bp, iomux_base + ofs);
+		else
+			__mxs_clrl(1 << bp, iomux_base + ofs);
+	}
+
+	/* pull */
+	if (PAD_PULL_VALID(pad)) {
+		ofs = cpu_is_mx23() ? 0x400 : 0x600;
+		ofs += PAD_BANK(pad) * 0x10;
+		bp = PAD_PIN(pad);
+		if (PAD_PULL(pad))
+			__mxs_setl(1 << bp, iomux_base + ofs);
+		else
+			__mxs_clrl(1 << bp, iomux_base + ofs);
+	}
+
+	return 0;
+}
+
+int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
+{
+	const iomux_cfg_t *p = pad_list;
+	int i;
+	int ret;
+
+	for (i = 0; i < count; i++) {
+		ret = mxs_iomux_setup_pad(*p);
+		if (ret)
+			return ret;
+		p++;
+	}
+
+	return 0;
+}