Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit bca6ef1e authored by Sascha Hauer's avatar Sascha Hauer
Browse files

MXC: Add iomux support for MX35 SoCs 



This iomux is called iomux-v3 in the tree because it is the third known
incarnation of MXC iomuxers. It is not only found on the MX35 but also
on the MX51 and probably others.

Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent 01eb1753

arch/arm/mach-mx3/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ config ARCH_MX31 


config ARCH_MX35

	bool

	select ARCH_MXC_IOMUX_V3



comment "MX3 platforms:"

arch/arm/plat-mxc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -51,4 +51,6 @@ config MXC_PWM 
	help

	  Enable support for the i.MX PWM controller(s).



config ARCH_MXC_IOMUX_V3

	bool

endif

arch/arm/plat-mxc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,4 +7,5 @@ obj-y := irq.o clock.o gpio.o time.o devices.o cpu.o system.o 


obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o

obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o

obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o

obj-$(CONFIG_MXC_PWM)  += pwm.o

arch/arm/plat-mxc/include/mach/iomux-v3.h

0 → 100644
+121 −0
Original line number Diff line number Diff line 
/*

 * 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.

 */



#ifndef __MACH_IOMUX_V3_H__

#define __MACH_IOMUX_V3_H__



/*

 *	build IOMUX_PAD structure

 *

 * This iomux scheme is based around pads, which are the physical balls

 * on the processor.

 *

 * - Each pad has a pad control register (IOMUXC_SW_PAD_CTRL_x) which controls

 *   things like driving strength and pullup/pulldown.

 * - Each pad can have but not necessarily does have an output routing register

 *   (IOMUXC_SW_MUX_CTL_PAD_x).

 * - Each pad can have but not necessarily does have an input routing register

 *   (IOMUXC_x_SELECT_INPUT)

 *

 * The three register sets do not have a fixed offset to each other,

 * hence we order this table by pad control registers (which all pads

 * have) and put the optional i/o routing registers into additional

 * fields.

 *

 * The naming convention for the pad modes is MX35_PAD_<padname>__<padmode>

 * If <padname> or <padmode> refers to a GPIO, it is named

 * GPIO_<unit>_<num>

 *

 */



struct pad_desc {

	unsigned mux_ctrl_ofs:12; /* IOMUXC_SW_MUX_CTL_PAD offset */

	unsigned mux_mode:8;

	unsigned pad_ctrl_ofs:12; /* IOMUXC_SW_PAD_CTRL offset */

#define	NO_PAD_CTRL	(1 << 16)

	unsigned pad_ctrl:17;

	unsigned select_input_ofs:12; /* IOMUXC_SELECT_INPUT offset */

	unsigned select_input:3;

};



#define IOMUX_PAD(_pad_ctrl_ofs, _mux_ctrl_ofs, _mux_mode, _select_input_ofs, \

		_select_input, _pad_ctrl)				\

		{							\

			.mux_ctrl_ofs     = _mux_ctrl_ofs,		\

			.mux_mode         = _mux_mode,			\

			.pad_ctrl_ofs     = _pad_ctrl_ofs,		\

			.pad_ctrl         = _pad_ctrl,			\

			.select_input_ofs = _select_input_ofs,		\

			.select_input     = _select_input,		\

		}



/*

 * Use to set PAD control

 */

#define PAD_CTL_DRIVE_VOLTAGE_3_3_V	0

#define PAD_CTL_DRIVE_VOLTAGE_1_8_V	1



#define PAD_CTL_NO_HYSTERESIS		0

#define PAD_CTL_HYSTERESIS		1



#define PAD_CTL_PULL_DISABLED		0x0

#define PAD_CTL_PULL_KEEPER		0xa

#define PAD_CTL_PULL_DOWN_100K		0xc

#define PAD_CTL_PULL_UP_47K		0xd

#define PAD_CTL_PULL_UP_100K		0xe

#define PAD_CTL_PULL_UP_22K		0xf



#define PAD_CTL_OUTPUT_CMOS		0

#define PAD_CTL_OUTPUT_OPEN_DRAIN	1



#define PAD_CTL_DRIVE_STRENGTH_NORM	0

#define PAD_CTL_DRIVE_STRENGTH_HIGH	1

#define PAD_CTL_DRIVE_STRENGTH_MAX	2



#define PAD_CTL_SLEW_RATE_SLOW		0

#define PAD_CTL_SLEW_RATE_FAST		1



/*

 * setups a single pad:

 * 	- reserves the pad so that it is not claimed by another driver

 * 	- setups the iomux according to the configuration

 */

int mxc_iomux_v3_setup_pad(struct pad_desc *pad);



/*

 * setups mutliple pads

 * convenient way to call the above function with tables

 */

int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count);



/*

 * releases a single pad:

 * 	- make it available for a future use by another driver

 * 	- DOES NOT reconfigure the IOMUX in its reset state

 */

void mxc_iomux_v3_release_pad(struct pad_desc *pad);



/*

 * releases multiple pads

 * convenvient way to call the above function with tables

 */

void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count);



#endif /* __MACH_IOMUX_V3_H__*/

arch/arm/plat-mxc/iomux-v3.c

0 → 100644
+98 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2004-2006 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 <mach/hardware.h>

#include <asm/mach/map.h>

#include <mach/iomux-v3.h>



#define IOMUX_BASE	IO_ADDRESS(IOMUXC_BASE_ADDR)



static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG];



/*

 * setups a single pin:

 * 	- reserves the pin so that it is not claimed by another driver

 * 	- setups the iomux according to the configuration

 */

int mxc_iomux_v3_setup_pad(struct pad_desc *pad)

{

	unsigned int pad_ofs = pad->pad_ctrl_ofs;



	if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map))

		return -EBUSY;

	if (pad->mux_ctrl_ofs)

		__raw_writel(pad->mux_mode, IOMUX_BASE + pad->mux_ctrl_ofs);



	if (pad->select_input_ofs)

		__raw_writel(pad->select_input,

				IOMUX_BASE + pad->select_input_ofs);



	if (!(pad->pad_ctrl & NO_PAD_CTRL))

		__raw_writel(pad->pad_ctrl, IOMUX_BASE + pad->pad_ctrl_ofs);

	return 0;

}

EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);



int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)

{

	struct pad_desc *p = pad_list;

	int i;

	int ret;



	for (i = 0; i < count; i++) {

		ret = mxc_iomux_v3_setup_pad(p);

		if (ret)

			goto setup_error;

		p++;

	}

	return 0;



setup_error:

	mxc_iomux_v3_release_multiple_pads(pad_list, i);

	return ret;

}

EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);



void mxc_iomux_v3_release_pad(struct pad_desc *pad)

{

	unsigned int pad_ofs = pad->pad_ctrl_ofs;



	clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map);

}

EXPORT_SYMBOL(mxc_iomux_v3_release_pad);



void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count)

{

	struct pad_desc *p = pad_list;

	int i;



	for (i = 0; i < count; i++) {

		mxc_iomux_v3_release_pad(p);

		p++;

	}

}

EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);