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: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Florian Fainelli 2010-03-21 01:06:05 +01:00 committed by Samuel Ortiz
parent f322d5f009
commit e090d506c3
4 changed files with 160 additions and 1 deletions

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@ -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"

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@ -63,4 +63,5 @@ 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-$(CONFIG_LPC_SCH) += lpc_sch.o
obj-$(CONFIG_LPC_SCH) += lpc_sch.o
obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o

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@ -0,0 +1,123 @@
/*
* 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");

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@ -0,0 +1,26 @@
#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 */