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  * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
  40  * Doesn't care about the failure of 'request_region', since other may reserve
  41  * the io ports as well
  42  */
  43 #define IS_RESERVED_ADDR(base, len) \
  44         (((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
  45         && ((base) + (len) > PCIBIOS_MIN_IO))
  46 /*
  47  * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
  48  * the io ports if they really know they can use it, while
  49  * still preventing hotplug PCI devices from using it.
  50  */
  51 static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
  52 {
  53         struct resource *requested_res = NULL;
  54
  55         ACPI_FUNCTION_TRACE("acpi_reserve_io_ranges");
  56
  57         if (res->type == ACPI_RSTYPE_IO) {
  58                 struct acpi_resource_io *io_res = &res->data.io;
  59
  60                 if (io_res->min_base_address != io_res->max_base_address)
  61                         return_VALUE(AE_OK);
  62                 if (IS_RESERVED_ADDR
  63                     (io_res->min_base_address, io_res->range_length)) {
  64                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  65                                           "Motherboard resources 0x%08x - 0x%08x\n",
  66                                           io_res->min_base_address,
  67                                           io_res->min_base_address +
  68                                           io_res->range_length));
  69                         requested_res =
  70                             request_region(io_res->min_base_address,
  71                                            io_res->range_length, "motherboard");
  72                 }
  73         } else if (res->type == ACPI_RSTYPE_FIXED_IO) {
  74                 struct acpi_resource_fixed_io *fixed_io_res =
  75                     &res->data.fixed_io;
  76
  77                 if (IS_RESERVED_ADDR
  78                     (fixed_io_res->base_address, fixed_io_res->range_length)) {
  79                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  80                                           "Motherboard resources 0x%08x - 0x%08x\n",
  81                                           fixed_io_res->base_address,
  82                                           fixed_io_res->base_address +
  83                                           fixed_io_res->range_length));
  84                         requested_res =
  85                             request_region(fixed_io_res->base_address,
  86                                            fixed_io_res->range_length,
  87                                            "motherboard");
  88                 }
  89         } else {
  90                 /* Memory mapped IO? */
  91         }
  92
  93         if (requested_res)
  94                 requested_res->flags &= ~IORESOURCE_BUSY;
  95         return_VALUE(AE_OK);
  96 }
  97
  98 static int acpi_motherboard_add(struct acpi_device *device)
  99 {
 100         if (!device)
 101                 return -EINVAL;
 102         acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 103                             acpi_reserve_io_ranges, NULL);
 104
 105         return 0;
 106 }
 107
 108 static struct acpi_driver acpi_motherboard_driver1 = {
 109         .name = "motherboard",
 110         .class = "",
 111         .ids = ACPI_MB_HID1,
 112         .ops = {
 113                 .add = acpi_motherboard_add,
 114                 },
 115 };
 116
 117 static struct acpi_driver acpi_motherboard_driver2 = {
 118         .name = "motherboard",
 119         .class = "",
 120         .ids = ACPI_MB_HID2,
 121         .ops = {
 122                 .add = acpi_motherboard_add,
 123                 },
 124 };
 125
 126 static void __init acpi_reserve_resources(void)
 127 {
 128         if (acpi_gbl_FADT->xpm1a_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
 129                 request_region(acpi_gbl_FADT->xpm1a_evt_blk.address,
 130                                acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
 131
 132         if (acpi_gbl_FADT->xpm1b_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
 133                 request_region(acpi_gbl_FADT->xpm1b_evt_blk.address,
 134                                acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
 135
 136         if (acpi_gbl_FADT->xpm1a_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
 137                 request_region(acpi_gbl_FADT->xpm1a_cnt_blk.address,
 138                                acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
 139
 140         if (acpi_gbl_FADT->xpm1b_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
 141                 request_region(acpi_gbl_FADT->xpm1b_cnt_blk.address,
 142                                acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
 143
 144         if (acpi_gbl_FADT->xpm_tmr_blk.address && acpi_gbl_FADT->pm_tm_len == 4)
 145                 request_region(acpi_gbl_FADT->xpm_tmr_blk.address, 4, "PM_TMR");
 146
 147         if (acpi_gbl_FADT->xpm2_cnt_blk.address && acpi_gbl_FADT->pm2_cnt_len)
 148                 request_region(acpi_gbl_FADT->xpm2_cnt_blk.address,
 149                                acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
 150
 151         /* Length of GPE blocks must be a non-negative multiple of 2 */
 152
 153         if (acpi_gbl_FADT->xgpe0_blk.address && acpi_gbl_FADT->gpe0_blk_len &&
 154             !(acpi_gbl_FADT->gpe0_blk_len & 0x1))
 155                 request_region(acpi_gbl_FADT->xgpe0_blk.address,
 156                                acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
 157
 158         if (acpi_gbl_FADT->xgpe1_blk.address && acpi_gbl_FADT->gpe1_blk_len &&
 159             !(acpi_gbl_FADT->gpe1_blk_len & 0x1))
 160                 request_region(acpi_gbl_FADT->xgpe1_blk.address,
 161                                acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
 162 }
 163
 164 static int __init acpi_motherboard_init(void)
 165 {
 166         acpi_bus_register_driver(&acpi_motherboard_driver1);
 167         acpi_bus_register_driver(&acpi_motherboard_driver2);
 168         /*
 169          * Guarantee motherboard IO reservation first
 170          * This module must run after scan.c
 171          */
 172         if (!acpi_disabled)
 173                 acpi_reserve_resources();
 174         return 0;
 175 }
 176
 177 /**
 178  * Reserve motherboard resources after PCI claim BARs,
 179  * but before PCI assign resources for uninitialized PCI devices
 180  */
 181 fs_initcall(acpi_motherboard_init);