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Commit e090d506 authored by Florian Fainelli's avatar Florian Fainelli Committed by Samuel Ortiz
Browse files

mfd: Add support for the RDC321x southbridge 



This patch adds a new MFD driver for the RDC321x southbridge. This southbridge
is always present in the RDC321x System-on-a-Chip and provides access to some
GPIOs as well as a watchdog. Access to these two functions is done using the
southbridge PCI device configuration space.

Signed-off-by: default avatarFlorian Fainelli <florian@openwrt.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent f322d5f0

drivers/mfd/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -409,6 +409,15 @@ config LPC_SCH 
	  LPC bridge function of the Intel SCH provides support for

	  System Management Bus and General Purpose I/O.



config MFD_RDC321X

	tristate "Support for RDC-R321x southbridge"

	select MFD_CORE

	depends on PCI

	help

	  Say yes here if you want to have support for the RDC R-321x SoC

	  southbridge which provides access to GPIOs and Watchdog using the

	  southbridge PCI device configuration space.



endmenu



menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -64,3 +64,4 @@ obj-$(CONFIG_AB4500_CORE) += ab4500-core.o 
obj-$(CONFIG_MFD_TIMBERDALE)    += timberdale.o

obj-$(CONFIG_PMIC_ADP5520)	+= adp5520.o

obj-$(CONFIG_LPC_SCH)		+= lpc_sch.o

obj-$(CONFIG_MFD_RDC321X)	+= rdc321x-southbridge.o

drivers/mfd/rdc321x-southbridge.c

0 → 100644
+123 −0
Original line number Diff line number Diff line 
/*

 * RDC321x MFD southbrige driver

 *

 * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>

 * Copyright (C) 2010 Bernhard Loos <bernhardloos@googlemail.com>

 *

 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */

#include <linux/init.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/pci.h>

#include <linux/mfd/core.h>

#include <linux/mfd/rdc321x.h>



static struct rdc321x_wdt_pdata rdc321x_wdt_pdata;



static struct resource rdc321x_wdt_resource[] = {

	{

		.name	= "wdt-reg",

		.start	= RDC321X_WDT_CTRL,

		.end	= RDC321X_WDT_CTRL + 0x3,

		.flags	= IORESOURCE_MEM,

	}

};



static struct rdc321x_gpio_pdata rdc321x_gpio_pdata = {

	.max_gpios	= RDC321X_MAX_GPIO,

};



static struct resource rdc321x_gpio_resources[] = {

	{

		.name	= "gpio-reg1",

		.start	= RDC321X_GPIO_CTRL_REG1,

		.end	= RDC321X_GPIO_CTRL_REG1 + 0x7,

		.flags	= IORESOURCE_MEM,

	}, {

		.name	= "gpio-reg2",

		.start	= RDC321X_GPIO_CTRL_REG2,

		.end	= RDC321X_GPIO_CTRL_REG2 + 0x7,

		.flags	= IORESOURCE_MEM,

	}

};



static struct mfd_cell rdc321x_sb_cells[] = {

	{

		.name		= "rdc321x-wdt",

		.resources	= rdc321x_wdt_resource,

		.num_resources	= ARRAY_SIZE(rdc321x_wdt_resource),

		.driver_data	= &rdc321x_wdt_pdata,

	}, {

		.name		= "rdc321x-gpio",

		.resources	= rdc321x_gpio_resources,

		.num_resources	= ARRAY_SIZE(rdc321x_gpio_resources),

		.driver_data	= &rdc321x_gpio_pdata,

	},

};



static int __devinit rdc321x_sb_probe(struct pci_dev *pdev,

					const struct pci_device_id *ent)

{

	int err;



	err = pci_enable_device(pdev);

	if (err) {

		dev_err(&pdev->dev, "failed to enable device\n");

		return err;

	}



	rdc321x_gpio_pdata.sb_pdev = pdev;

	rdc321x_wdt_pdata.sb_pdev = pdev;



	return mfd_add_devices(&pdev->dev, -1,

		rdc321x_sb_cells, ARRAY_SIZE(rdc321x_sb_cells), NULL, 0);

}



static void __devexit rdc321x_sb_remove(struct pci_dev *pdev)

{

	mfd_remove_devices(&pdev->dev);

}



static DEFINE_PCI_DEVICE_TABLE(rdc321x_sb_table) = {

	{ PCI_DEVICE(PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030) },

	{}

};



static struct pci_driver rdc321x_sb_driver = {

	.name		= "RDC321x Southbridge",

	.id_table	= rdc321x_sb_table,

	.probe		= rdc321x_sb_probe,

	.remove		= __devexit_p(rdc321x_sb_remove),

};



static int __init rdc321x_sb_init(void)

{

	return pci_register_driver(&rdc321x_sb_driver);

}



static void __exit rdc321x_sb_exit(void)

{

	pci_unregister_driver(&rdc321x_sb_driver);

}



module_init(rdc321x_sb_init);

module_exit(rdc321x_sb_exit);



MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("RDC R-321x MFD southbridge driver");

include/linux/mfd/rdc321x.h

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+26 −0
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#ifndef __RDC321X_MFD_H

#define __RDC321X_MFD_H



#include <linux/types.h>

#include <linux/pci.h>



/* Offsets to be accessed in the southbridge PCI

 * device configuration register */

#define RDC321X_WDT_CTRL	0x44

#define RDC321X_GPIO_CTRL_REG1	0x48

#define RDC321X_GPIO_DATA_REG1	0x4c

#define RDC321X_GPIO_CTRL_REG2	0x84

#define RDC321X_GPIO_DATA_REG2	0x88



#define RDC321X_MAX_GPIO	58



struct rdc321x_gpio_pdata {

	struct pci_dev *sb_pdev;

	unsigned max_gpios;

};



struct rdc321x_wdt_pdata {

	struct pci_dev *sb_pdev;

};



#endif /* __RDC321X_MFD_H */