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Bjorn Helgaas
9a47cdb1bb
Resources described by the FADT aren't really a good fit for the ACPI motherboard driver. The motherboard driver cares about PNP0C01 and PNP0C02 devices and their resources. The FADT describes some resources used by the ACPI core. Often, they are also described by by the _CRS of a motherboard device, but I think it's better to reserve them specifically in the ACPI osl.c because (a) the motherboard driver is optional and ACPI uses the resources even if the driver is absent, and (b) I want to remove the ACPI motherboard driver because it's mostly redundant with the PNP system.c driver. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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/* Purpose: Prevent PCMCIA cards from using motherboard resources. */
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <asm/io.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("acpi_motherboard")
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/* Dell use PNP0C01 instead of PNP0C02 */
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#define ACPI_MB_HID "PNP0C01,PNP0C02"
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/**
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* Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
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* Doesn't care about the failure of 'request_region', since other may reserve
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* the io ports as well
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*/
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#define IS_RESERVED_ADDR(base, len) \
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(((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
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&& ((base) + (len) > PCIBIOS_MIN_IO))
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/*
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* Clearing the flag (IORESOURCE_BUSY) allows drivers to use
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* the io ports if they really know they can use it, while
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* still preventing hotplug PCI devices from using it.
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*/
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/*
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* When CONFIG_PNP is enabled, pnp/system.c binds to PNP0C01
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* and PNP0C02, redundant with acpi_reserve_io_ranges().
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* But acpi_reserve_io_ranges() is necessary for !CONFIG_PNP.
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*/
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static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
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{
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struct resource *requested_res = NULL;
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if (res->type == ACPI_RESOURCE_TYPE_IO) {
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struct acpi_resource_io *io_res = &res->data.io;
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if (io_res->minimum != io_res->maximum)
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return AE_OK;
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if (IS_RESERVED_ADDR
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(io_res->minimum, io_res->address_length)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Motherboard resources 0x%08x - 0x%08x\n",
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io_res->minimum,
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io_res->minimum +
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io_res->address_length));
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requested_res =
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request_region(io_res->minimum,
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io_res->address_length, "motherboard");
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}
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} else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
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struct acpi_resource_fixed_io *fixed_io_res =
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&res->data.fixed_io;
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if (IS_RESERVED_ADDR
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(fixed_io_res->address, fixed_io_res->address_length)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Motherboard resources 0x%08x - 0x%08x\n",
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fixed_io_res->address,
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fixed_io_res->address +
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fixed_io_res->address_length));
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requested_res =
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request_region(fixed_io_res->address,
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fixed_io_res->address_length,
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"motherboard");
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}
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} else {
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/* Memory mapped IO? */
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}
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if (requested_res)
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requested_res->flags &= ~IORESOURCE_BUSY;
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return AE_OK;
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}
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static int acpi_motherboard_add(struct acpi_device *device)
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{
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if (!device)
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return -EINVAL;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS,
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acpi_reserve_io_ranges, NULL);
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return 0;
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}
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static struct acpi_driver acpi_motherboard_driver = {
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.name = "motherboard",
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.class = "",
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.ids = ACPI_MB_HID,
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.ops = {
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.add = acpi_motherboard_add,
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},
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};
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static int __init acpi_motherboard_init(void)
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{
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acpi_bus_register_driver(&acpi_motherboard_driver);
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return 0;
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}
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/**
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* Reserve motherboard resources after PCI claim BARs,
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* but before PCI assign resources for uninitialized PCI devices
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*/
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fs_initcall(acpi_motherboard_init);
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