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/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
/* Purpose: Prevent PCMCIA cards from using motherboard resources. */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("acpi_motherboard")
/* Dell use PNP0C01 instead of PNP0C02 */
#define ACPI_MB_HID "PNP0C01,PNP0C02"
/**
* Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
* Doesn't care about the failure of 'request_region', since other may reserve
* the io ports as well
*/
#define IS_RESERVED_ADDR(base, len) \
(((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
&& ((base) + (len) > PCIBIOS_MIN_IO))
/*
* Clearing the flag (IORESOURCE_BUSY) allows drivers to use
* the io ports if they really know they can use it, while
* still preventing hotplug PCI devices from using it.
*/
/*
* When CONFIG_PNP is enabled, pnp/system.c binds to PNP0C01
* and PNP0C02, redundant with acpi_reserve_io_ranges().
* But acpi_reserve_io_ranges() is necessary for !CONFIG_PNP.
*/
static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
{
struct resource *requested_res = NULL;
if (res->type == ACPI_RESOURCE_TYPE_IO) {
struct acpi_resource_io *io_res = &res->data.io;
if (io_res->minimum != io_res->maximum)
return AE_OK;
if (IS_RESERVED_ADDR
(io_res->minimum, io_res->address_length)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Motherboard resources 0x%08x - 0x%08x\n",
io_res->minimum,
io_res->minimum +
io_res->address_length));
requested_res =
request_region(io_res->minimum,
io_res->address_length, "motherboard");
}
} else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
struct acpi_resource_fixed_io *fixed_io_res =
&res->data.fixed_io;
if (IS_RESERVED_ADDR
(fixed_io_res->address, fixed_io_res->address_length)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Motherboard resources 0x%08x - 0x%08x\n",
fixed_io_res->address,
fixed_io_res->address +
fixed_io_res->address_length));
requested_res =
request_region(fixed_io_res->address,
fixed_io_res->address_length,
"motherboard");
}
} else {
/* Memory mapped IO? */
}
if (requested_res)
requested_res->flags &= ~IORESOURCE_BUSY;
return AE_OK;
}
static int acpi_motherboard_add(struct acpi_device *device)
{
if (!device)
return -EINVAL;
acpi_walk_resources(device->handle, METHOD_NAME__CRS,
acpi_reserve_io_ranges, NULL);
return 0;
}
static struct acpi_driver acpi_motherboard_driver = {
.name = "motherboard",
.class = "",
.ids = ACPI_MB_HID,
.ops = {
.add = acpi_motherboard_add,
},
};
static int __init acpi_motherboard_init(void)
{
acpi_bus_register_driver(&acpi_motherboard_driver);
return 0;
}
/**
* Reserve motherboard resources after PCI claim BARs,
* but before PCI assign resources for uninitialized PCI devices
*/
fs_initcall(acpi_motherboard_init);
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