185 lines
5.5 KiB
C
185 lines
5.5 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_HID1 "PNP0C01"
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#define ACPI_MB_HID2 "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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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_driver1 = {
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.name = "motherboard",
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.class = "",
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.ids = ACPI_MB_HID1,
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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 struct acpi_driver acpi_motherboard_driver2 = {
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.name = "motherboard",
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.class = "",
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.ids = ACPI_MB_HID2,
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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 void __init acpi_request_region (struct acpi_generic_address *addr,
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unsigned int length, char *desc)
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{
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if (!addr->address || !length)
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return;
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if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
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request_region(addr->address, length, desc);
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else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
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request_mem_region(addr->address, length, desc);
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}
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static void __init acpi_reserve_resources(void)
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{
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acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
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acpi_gbl_FADT->pm1_evt_len, "ACPI PM1a_EVT_BLK");
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acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
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acpi_gbl_FADT->pm1_evt_len, "ACPI PM1b_EVT_BLK");
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acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
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acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1a_CNT_BLK");
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acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
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acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1b_CNT_BLK");
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if (acpi_gbl_FADT->pm_tm_len == 4)
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acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "ACPI PM_TMR");
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acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
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acpi_gbl_FADT->pm2_cnt_len, "ACPI PM2_CNT_BLK");
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/* Length of GPE blocks must be a non-negative multiple of 2 */
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if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
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acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
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acpi_gbl_FADT->gpe0_blk_len, "ACPI GPE0_BLK");
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if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
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acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
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acpi_gbl_FADT->gpe1_blk_len, "ACPI GPE1_BLK");
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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_driver1);
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acpi_bus_register_driver(&acpi_motherboard_driver2);
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/*
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* Guarantee motherboard IO reservation first
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* This module must run after scan.c
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*/
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if (!acpi_disabled)
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acpi_reserve_resources();
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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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