e967f77d98
Intel Poulsbo SCH and Tunnel Creek provide almost the same LPC interface. Use the same driver for both devices while storing PCI ID to distinguish between platforms to apply plarform related quirks. Signed-off-by: Denis Turischev <denis@compulab.co.il> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* lpc_sch.c - LPC interface for Intel Poulsbo SCH
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*
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* LPC bridge function of the Intel SCH contains many other
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* functional units, such as Interrupt controllers, Timers,
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* Power Management, System Management, GPIO, RTC, and LPC
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* Configuration Registers.
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*
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* Copyright (c) 2010 CompuLab Ltd
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* Author: Denis Turischev <denis@compulab.co.il>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#include <linux/pci.h>
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#include <linux/mfd/core.h>
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#define SMBASE 0x40
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#define SMBUS_IO_SIZE 64
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#define GPIOBASE 0x44
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#define GPIO_IO_SIZE 64
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static struct resource smbus_sch_resource = {
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.flags = IORESOURCE_IO,
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};
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static struct resource gpio_sch_resource = {
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.flags = IORESOURCE_IO,
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};
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static struct mfd_cell lpc_sch_cells[] = {
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{
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.name = "isch_smbus",
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.num_resources = 1,
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.resources = &smbus_sch_resource,
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},
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{
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.name = "sch_gpio",
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.num_resources = 1,
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.resources = &gpio_sch_resource,
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},
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};
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static struct pci_device_id lpc_sch_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
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static int __devinit lpc_sch_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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unsigned int base_addr_cfg;
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unsigned short base_addr;
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int i;
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pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
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if (!(base_addr_cfg & (1 << 31))) {
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dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
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return -ENODEV;
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}
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base_addr = (unsigned short)base_addr_cfg;
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if (base_addr == 0) {
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dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
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return -ENODEV;
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}
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smbus_sch_resource.start = base_addr;
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smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
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pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
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if (!(base_addr_cfg & (1 << 31))) {
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dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
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return -ENODEV;
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}
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base_addr = (unsigned short)base_addr_cfg;
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if (base_addr == 0) {
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dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
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return -ENODEV;
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}
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gpio_sch_resource.start = base_addr;
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gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
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for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
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lpc_sch_cells[i].id = id->device;
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return mfd_add_devices(&dev->dev, 0,
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lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
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}
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static void __devexit lpc_sch_remove(struct pci_dev *dev)
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{
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mfd_remove_devices(&dev->dev);
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}
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static struct pci_driver lpc_sch_driver = {
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.name = "lpc_sch",
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.id_table = lpc_sch_ids,
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.probe = lpc_sch_probe,
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.remove = __devexit_p(lpc_sch_remove),
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};
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static int __init lpc_sch_init(void)
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{
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return pci_register_driver(&lpc_sch_driver);
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}
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static void __exit lpc_sch_exit(void)
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{
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pci_unregister_driver(&lpc_sch_driver);
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}
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module_init(lpc_sch_init);
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module_exit(lpc_sch_exit);
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MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
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MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
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MODULE_LICENSE("GPL");
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