[PATCH 08/15] ARM: mxs: Add iomux support

[u.kleine-koenig@pengutronix.de (Uwe Kleine-König)]

On Fri, Nov 26, 2010 at 02:49:07PM +0800, Shawn Guo wrote:
> MXS-based SoCs implements iomux functions in block PINCTRL.
> 
> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
> ---
>  arch/arm/mach-mxs/include/mach/iomux-mx23.h |   29 +++++++
>  arch/arm/mach-mxs/include/mach/iomux-mx28.h |   44 +++++++++++
>  arch/arm/mach-mxs/include/mach/iomux.h      |   77 +++++++++++++++++++
>  arch/arm/mach-mxs/iomux.c                   |  110 +++++++++++++++++++++++++++
>  4 files changed, 260 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-mxs/include/mach/iomux-mx23.h
>  create mode 100644 arch/arm/mach-mxs/include/mach/iomux-mx28.h
>  create mode 100644 arch/arm/mach-mxs/include/mach/iomux.h
>  create mode 100644 arch/arm/mach-mxs/iomux.c
> 
> diff --git a/arch/arm/mach-mxs/include/mach/iomux-mx23.h b/arch/arm/mach-mxs/include/mach/iomux-mx23.h
> new file mode 100644
> index 0000000..3fc0439
> --- /dev/null
> +++ b/arch/arm/mach-mxs/include/mach/iomux-mx23.h
> @@ -0,0 +1,29 @@
> +/*
> + * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>
> + * Copyright (C) 2010 Freescale Semiconductor, Inc.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#ifndef __MACH_IOMUX_MX23_H__
> +#define __MACH_IOMUX_MX23_H__
> +
> +#include <mach/iomux.h>
> +
> +/*
> + * The naming convention for the pad modes is MX23_PAD_<padname>__<padmode>
> + * If <padname> or <padmode> refers to a GPIO, it is named GPIO_<unit>_<num>
> + * See also iomux.h
> + *
> + *					 		BANK PIN     MUX            VOL          MA            PULL
> + */
> +/* DUART */
> +#define MX23_PAD_PWM0__DUART_RX			IOMUX_PAD(1, 26, PAD_MUXSEL_2,    PAD_VOL_NONE, PAD_4MA,      PAD_NOPULL)
> +#define MX23_PAD_PWM1__DUART_TX			IOMUX_PAD(1, 27, PAD_MUXSEL_2,    PAD_VOL_NONE, PAD_4MA,      PAD_NOPULL)
> +
> +#endif /* __MACH_IOMUX_MX23_H__ */
> diff --git a/arch/arm/mach-mxs/include/mach/iomux-mx28.h b/arch/arm/mach-mxs/include/mach/iomux-mx28.h
> new file mode 100644
> index 0000000..ca37a15
> --- /dev/null
> +++ b/arch/arm/mach-mxs/include/mach/iomux-mx28.h
> @@ -0,0 +1,44 @@
> +/*
> + * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>
> + * Copyright (C) 2010 Freescale Semiconductor, Inc.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#ifndef __MACH_IOMUX_MX28_H__
> +#define __MACH_IOMUX_MX28_H__
> +
> +#include <mach/iomux.h>
> +
> +/*
> + * The naming convention for the pad modes is MX28_PAD_<padname>__<padmode>
> + * If <padname> or <padmode> refers to a GPIO, it is named GPIO_<unit>_<num>
> + * See also iomux.h
> + *
> + *					 		BANK PIN     MUX            VOL          MA            PULL
> + */
> +/* DUART */
> +#define MX28_PAD_PWM0__DUART_RX			IOMUX_PAD(3, 16, PAD_MUXSEL_2,    PAD_3V3,     PAD_4MA,      PAD_NOPULL)
> +#define MX28_PAD_PWM1__DUART_TX			IOMUX_PAD(3, 17, PAD_MUXSEL_2,    PAD_3V3,     PAD_4MA,      PAD_NOPULL)
> +
> +/* FEC */
> +#define MX28_PAD_ENET0_MDC__ENET0_MDC		IOMUX_PAD(4, 0,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_MDIO__ENET0_MDIO		IOMUX_PAD(4, 1,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_RX_EN__ENET0_RX_EN	IOMUX_PAD(4, 2,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_RXD0__ENET0_RXD0		IOMUX_PAD(4, 3,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_RXD1__ENET0_RXD1		IOMUX_PAD(4, 4,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_TX_EN__ENET0_TX_EN	IOMUX_PAD(4, 6,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_TXD0__ENET0_TXD0		IOMUX_PAD(4, 7,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET0_TXD1__ENET0_TXD1		IOMUX_PAD(4, 8,  PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +#define MX28_PAD_ENET_CLK__ENET_CLK		IOMUX_PAD(4, 16, PAD_MUXSEL_0,    PAD_3V3,     PAD_8MA,      PAD_PULL)
> +
> +/* GPIO */
> +#define MX28_PAD_SSP1_DATA3__GPIO_2_15		IOMUX_PAD(2, 15, PAD_MUXSEL_GPIO, PAD_3V3,     PAD_4MA,      PAD_NOPULL)
> +#define MX28_PAD_ENET0_RX_CLK__GPIO_4_13	IOMUX_PAD(4, 13, PAD_MUXSEL_GPIO, PAD_3V3,     PAD_4MA,      PAD_NOPULL)
> +
> +#endif /* __MACH_IOMUX_MX28_H__ */
> diff --git a/arch/arm/mach-mxs/include/mach/iomux.h b/arch/arm/mach-mxs/include/mach/iomux.h
> new file mode 100644
> index 0000000..27bcada
> --- /dev/null
> +++ b/arch/arm/mach-mxs/include/mach/iomux.h
> @@ -0,0 +1,77 @@
> +/*
> + * 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__
> +
> +typedef struct pad_desc {
> +	unsigned bank:3;
> +	unsigned pin:5;
> +	unsigned muxsel:2;
> +	unsigned ma:3;
> +	unsigned vol:2;
> +	unsigned pull:1;
> +} iomux_cfg_t;
mxc just switches to u64 (IIRC) for pad descriptions because the values
are easier to manipulate.  This would be better for mxs, too.

> +
> +#define IOMUX_PAD(_bank, _pin, _muxsel, _vol, _ma, _pull)	\
> +		{						\
> +			.bank	= _bank,			\
> +			.pin	= _pin,				\
> +			.muxsel	= _muxsel,			\
> +			.vol	= _vol,				\
> +			.ma	= _ma,				\
> +			.pull	= _pull,			\
> +		}
> +
> +#define PAD_MUXSEL_0		0
> +#define PAD_MUXSEL_1		1
> +#define PAD_MUXSEL_2		2
> +#define PAD_MUXSEL_GPIO		3
> +
> +#define PAD_1V8			0
> +#define PAD_3V3			1
> +#define PAD_VOL_NONE		2
> +
> +#define PAD_4MA			0
> +#define PAD_8MA			1
> +#define PAD_12MA		2
> +#define PAD_16MA		3
> +#define PAD_MA_NONE		4
> +
> +#define PAD_NOPULL		0
> +#define PAD_PULL		1
> +
> +/*
> + * setups a single pad in the iomuxer
> + */
> +int mxs_iomux_setup_pad(iomux_cfg_t *pad);
> +
> +/*
> + * setups multiple pads
> + * convenient way to call the above function with tables
> + */
> +int mxs_iomux_setup_multiple_pads(iomux_cfg_t *pad_list, unsigned count);
> +
> +/*
> + * Initialise the iomux controller
> + */
> +void mxs_iomux_init(void __iomem *iomux_base);
> +
> +#endif /* __MACH_MXS_IOMUX_H__*/
> diff --git a/arch/arm/mach-mxs/iomux.c b/arch/arm/mach-mxs/iomux.c
> new file mode 100644
> index 0000000..803cadf
> --- /dev/null
> +++ b/arch/arm/mach-mxs/iomux.c
> @@ -0,0 +1,110 @@
> +/*
> + * 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/hardware.h>
> +#include <mach/iomux.h>
> +
> +static void __iomem *base;
> +
> +/*
> + * configures a single pad in the iomuxer
> + */
> +int mxs_iomux_setup_pad(iomux_cfg_t *pad)
> +{
> +	u32 reg, ofs, bp, bm;
> +
> +	/* muxsel */
> +	ofs = pad->bank * 0x20 + pad->pin / 16 * 0x10;
> +	bp = pad->pin % 16 * 2;
> +	bm = 0x3 << bp;
> +	reg = __raw_readl(base + ofs);
> +	reg &= ~bm;
> +	reg |= pad->muxsel << bp;
> +	__raw_writel(reg, base + ofs);
> +
> +	/* drive */
> +	ofs = cpu_is_mx23() ? 0x200 : 0x300;
> +	ofs += pad->bank * 0x40 + pad->pin / 8 * 0x10;
> +	/* ma */
> +	if (pad->ma != PAD_MA_NONE)
> +	{
> +		bp = pad->pin % 8 * 4;
> +		bm = 0x3 << bp;
> +		reg = __raw_readl(base + ofs);
> +		reg &= ~bm;
> +		reg |= pad->ma << bp;
> +		__raw_writel(reg, base + ofs);
> +	}
> +	/* vol */
> +	if (pad->vol != PAD_VOL_NONE)
> +	{
> +		bp = pad->pin % 8 * 4 + 2;
> +		bm = 0x1 << bp;
> +		reg = __raw_readl(base + ofs);
> +		reg &= ~bm;
> +		reg |= pad->vol << bp;
> +		__raw_writel(reg, base + ofs);
> +	}
> +
> +	/* pull */
> +	ofs = cpu_is_mx23() ? 0x400 : 0x600;
> +	ofs += pad->bank * 0x10;
> +	bp = pad->pin;
> +	bm = 0x1 << bp;
> +	reg = __raw_readl(base + ofs);
> +	reg &= ~bm;
> +	reg |= pad->pull << bp;
> +	__raw_writel(reg, base + ofs);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(mxs_iomux_setup_pad);
Really needed?

> +
> +int mxs_iomux_setup_multiple_pads(iomux_cfg_t *pad_list, unsigned count)
> +{
> +	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;
> +}
> +EXPORT_SYMBOL(mxs_iomux_setup_multiple_pads);
> +
> +void mxs_iomux_init(void __iomem *iomux_base)
> +{
> +	base = iomux_base;
> +}

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |