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Commit e82c60ae authored by Denis Turischev's avatar Denis Turischev Committed by Samuel Ortiz
Browse files

mfd: Introduce lpc_sch for Intel SCH LPC bridge 



Intel Poulsbo (SCH) chipset LPC bridge controller contains several
functions. Creating and MFD driver for the LPC bridge controller allows
simultaneous use of SMBus and GPIO interfaces on the SCH.

Signed-off-by: default avatarDenis Turischev <denis@compulab.co.il>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 91fedede

drivers/mfd/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -389,6 +389,15 @@ config MFD_TIMBERDALE 


	The timberdale FPGA can be found on the Intel Atom development board

	for in-vehicle infontainment, called Russellville.



config LPC_SCH

	tristate "Intel SCH LPC"

	depends on PCI

	select MFD_CORE

	help

	  LPC bridge function of the Intel SCH provides support for

	  System Management Bus and General Purpose I/O.



endmenu



menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -62,3 +62,4 @@ obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o 
obj-$(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
 
 No newline at end of file

drivers/mfd/lpc_sch.c

0 → 100644
+133 −0
Original line number Diff line number Diff line 
/*

 *  lpc_sch.c - LPC interface for Intel Poulsbo SCH

 *

 *  LPC bridge function of the Intel SCH contains many other

 *  functional units, such as Interrupt controllers, Timers,

 *  Power Management, System Management, GPIO, RTC, and LPC

 *  Configuration Registers.

 *

 *  Copyright (c) 2010 CompuLab Ltd

 *  Author: Denis Turischev <denis@compulab.co.il>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License 2 as published

 *  by the Free Software Foundation.

 *

 *  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; see the file COPYING.  If not, write to

 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

 */



#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/acpi.h>

#include <linux/pci.h>

#include <linux/mfd/core.h>



#define SMBASE		0x40

#define SMBUS_IO_SIZE	64



#define GPIOBASE	0x44

#define GPIO_IO_SIZE	64



static struct resource smbus_sch_resource = {

		.flags = IORESOURCE_IO,

};





static struct resource gpio_sch_resource = {

		.flags = IORESOURCE_IO,

};



static struct mfd_cell lpc_sch_cells[] = {

	{

		.name = "isch_smbus",

		.num_resources = 1,

		.resources = &smbus_sch_resource,

	},

	{

		.name = "sch_gpio",

		.num_resources = 1,

		.resources = &gpio_sch_resource,

	},

};



static struct pci_device_id lpc_sch_ids[] = {

	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },

	{ 0, }

};

MODULE_DEVICE_TABLE(pci, lpc_sch_ids);



static int __devinit lpc_sch_probe(struct pci_dev *dev,

				const struct pci_device_id *id)

{

	unsigned int base_addr_cfg;

	unsigned short base_addr;



	pci_read_config_dword(dev, SMBASE, &base_addr_cfg);

	if (!(base_addr_cfg & (1 << 31))) {

		dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");

		return -ENODEV;

	}

	base_addr = (unsigned short)base_addr_cfg;

	if (base_addr == 0) {

		dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");

		return -ENODEV;

	}



	smbus_sch_resource.start = base_addr;

	smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;



	pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);

	if (!(base_addr_cfg & (1 << 31))) {

		dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");

		return -ENODEV;

	}

	base_addr = (unsigned short)base_addr_cfg;

	if (base_addr == 0) {

		dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");

		return -ENODEV;

	}



	gpio_sch_resource.start = base_addr;

	gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;



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

			lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);

}



static void __devexit lpc_sch_remove(struct pci_dev *dev)

{

	mfd_remove_devices(&dev->dev);

}



static struct pci_driver lpc_sch_driver = {

	.name		= "lpc_sch",

	.id_table	= lpc_sch_ids,

	.probe		= lpc_sch_probe,

	.remove		= __devexit_p(lpc_sch_remove),

};



static int __init lpc_sch_init(void)

{

	return pci_register_driver(&lpc_sch_driver);

}



static void __exit lpc_sch_exit(void)

{

	pci_unregister_driver(&lpc_sch_driver);

}



module_init(lpc_sch_init);

module_exit(lpc_sch_exit);



MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");

MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");

MODULE_LICENSE("GPL");