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/*
* 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
#define WDTBASE 0x84
#define WDT_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 resource wdt_sch_resource = {
.flags = IORESOURCE_IO,
};
static struct mfd_cell tunnelcreek_cells[] = {
{
.name = "tunnelcreek_wdt",
.num_resources = 1,
.resources = &wdt_sch_resource,
},
};
static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_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;
int i;
int ret;
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;
for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
lpc_sch_cells[i].id = id->device;
ret = mfd_add_devices(&dev->dev, 0,
lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
if (ret)
goto out_dev;
if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC) {
pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
if (!(base_addr_cfg & (1 << 31))) {
dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
ret = -ENODEV;
goto out_dev;
}
base_addr = (unsigned short)base_addr_cfg;
if (base_addr == 0) {
dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
ret = -ENODEV;
goto out_dev;
}
wdt_sch_resource.start = base_addr;
wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
tunnelcreek_cells[i].id = id->device;
ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
ARRAY_SIZE(tunnelcreek_cells), NULL, 0);
}
return ret;
out_dev:
mfd_remove_devices(&dev->dev);
return ret;
}
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),
};
module_pci_driver(lpc_sch_driver);
MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
MODULE_LICENSE("GPL");
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