drivers/acpi/motherboard.c

   1 /*
   2  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   3  *  This program is free software; you can redistribute it and/or modify
   4  *  it under the terms of the GNU General Public License as published by
   5  *  the Free Software Foundation; either version 2 of the License, or (at
   6  *  your option) any later version.
   7  *
   8  *  This program is distributed in the hope that it will be useful, but
   9  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *  General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License along
  14  *  with this program; if not, write to the Free Software Foundation, Inc.,
  15  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  18  */
  19
  20 /* Purpose: Prevent PCMCIA cards from using motherboard resources. */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/types.h>
  25 #include <linux/pci.h>
  26 #include <linux/ioport.h>
  27 #include <asm/io.h>
  28
  29 #include <acpi/acpi_bus.h>
  30 #include <acpi/acpi_drivers.h>
  31
  32 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  33 ACPI_MODULE_NAME                ("acpi_motherboard")
  34
  35 /* Dell use PNP0C01 instead of PNP0C02 */
  36 #define ACPI_MB_HID1                    "PNP0C01"
  37 #define ACPI_MB_HID2                    "PNP0C02"
  38
  39 /**
  40  * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
  41  * Doesn't care about the failure of 'request_region', since other may reserve
  42  * the io ports as well
  43  */
  44 #define IS_RESERVED_ADDR(base, len) \
  45         (((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
  46         && ((base) + (len) > 0x1000))
  47
  48 /*
  49  * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
  50  * the io ports if they really know they can use it, while
  51  * still preventing hotplug PCI devices from using it.
  52  */
  53
  54 static acpi_status
  55 acpi_reserve_io_ranges (struct acpi_resource *res, void *data)
  56 {
  57         struct resource *requested_res = NULL;
  58
  59         ACPI_FUNCTION_TRACE("acpi_reserve_io_ranges");
  60
  61         if (res->id == ACPI_RSTYPE_IO) {
  62                 struct acpi_resource_io *io_res = &res->data.io;
  63
  64                 if (io_res->min_base_address != io_res->max_base_address)
  65                         return_VALUE(AE_OK);
  66                 if (IS_RESERVED_ADDR(io_res->min_base_address, io_res->range_length)) {
  67                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n",
  68                                 io_res->min_base_address,
  69                                 io_res->min_base_address + io_res->range_length));
  70                         requested_res = request_region(io_res->min_base_address,
  71                                 io_res->range_length, "motherboard");
  72                 }
  73         } else if (res->id == ACPI_RSTYPE_FIXED_IO) {
  74                 struct acpi_resource_fixed_io *fixed_io_res = &res->data.fixed_io;
  75
  76                 if (IS_RESERVED_ADDR(fixed_io_res->base_address, fixed_io_res->range_length)) {
  77                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n",
  78                                 fixed_io_res->base_address,
  79                                 fixed_io_res->base_address + fixed_io_res->range_length));
  80                         requested_res = request_region(fixed_io_res->base_address,
  81                                 fixed_io_res->range_length, "motherboard");
  82                 }
  83         } else {
  84                 /* Memory mapped IO? */
  85         }
  86
  87         if (requested_res)
  88                 requested_res->flags &= ~IORESOURCE_BUSY;
  89         return_VALUE(AE_OK);
  90 }
  91
  92 static int acpi_motherboard_add (struct acpi_device *device)
  93 {
  94         if (!device)
  95                 return -EINVAL;
  96         acpi_walk_resources(device->handle, METHOD_NAME__CRS,
  97                 acpi_reserve_io_ranges, NULL);
  98
  99         return 0;
 100 }
 101
 102 static struct acpi_driver acpi_motherboard_driver1 = {
 103         .name =         "motherboard",
 104         .class =        "",
 105         .ids =          ACPI_MB_HID1,
 106         .ops =  {
 107                 .add =          acpi_motherboard_add,
 108         },
 109 };
 110
 111 static struct acpi_driver acpi_motherboard_driver2 = {
 112         .name =         "motherboard",
 113         .class =        "",
 114         .ids =          ACPI_MB_HID2,
 115         .ops =  {
 116                 .add =          acpi_motherboard_add,
 117         },
 118 };
 119
 120 static void __init
 121 acpi_reserve_resources (void)
 122 {
 123         if (acpi_gbl_FADT->xpm1a_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
 124                 request_region(acpi_gbl_FADT->xpm1a_evt_blk.address,
 125                         acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
 126
 127         if (acpi_gbl_FADT->xpm1b_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
 128                 request_region(acpi_gbl_FADT->xpm1b_evt_blk.address,
 129                         acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
 130
 131         if (acpi_gbl_FADT->xpm1a_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
 132                 request_region(acpi_gbl_FADT->xpm1a_cnt_blk.address,
 133                         acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
 134
 135         if (acpi_gbl_FADT->xpm1b_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
 136                 request_region(acpi_gbl_FADT->xpm1b_cnt_blk.address,
 137                         acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
 138
 139         if (acpi_gbl_FADT->xpm_tmr_blk.address && acpi_gbl_FADT->pm_tm_len == 4)
 140                 request_region(acpi_gbl_FADT->xpm_tmr_blk.address,
 141                         4, "PM_TMR");
 142
 143         if (acpi_gbl_FADT->xpm2_cnt_blk.address && acpi_gbl_FADT->pm2_cnt_len)
 144                 request_region(acpi_gbl_FADT->xpm2_cnt_blk.address,
 145                         acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
 146
 147         /* Length of GPE blocks must be a non-negative multiple of 2 */
 148
 149         if (acpi_gbl_FADT->xgpe0_blk.address && acpi_gbl_FADT->gpe0_blk_len &&
 150                         !(acpi_gbl_FADT->gpe0_blk_len & 0x1))
 151                 request_region(acpi_gbl_FADT->xgpe0_blk.address,
 152                         acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
 153
 154         if (acpi_gbl_FADT->xgpe1_blk.address && acpi_gbl_FADT->gpe1_blk_len &&
 155                         !(acpi_gbl_FADT->gpe1_blk_len & 0x1))
 156                 request_region(acpi_gbl_FADT->xgpe1_blk.address,
 157                         acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
 158 }
 159
 160 static int __init acpi_motherboard_init(void)
 161 {
 162         acpi_bus_register_driver(&acpi_motherboard_driver1);
 163         acpi_bus_register_driver(&acpi_motherboard_driver2);
 164         /*
 165          * Guarantee motherboard IO reservation first
 166          * This module must run after scan.c
 167          */
 168         if (!acpi_disabled)
 169                 acpi_reserve_resources ();
 170         return 0;
 171 }
 172
 173 /**
 174  * Reserve motherboard resources after PCI claim BARs,
 175  * but before PCI assign resources for uninitialized PCI devices
 176  */
 177 fs_initcall(acpi_motherboard_init);