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_HID                     "PNP0C01,PNP0C02"
  37 /**
  38  * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
  39  * Doesn't care about the failure of 'request_region', since other may reserve
  40  * the io ports as well
  41  */
  42 #define IS_RESERVED_ADDR(base, len) \
  43         (((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
  44         && ((base) + (len) > PCIBIOS_MIN_IO))
  45 /*
  46  * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
  47  * the io ports if they really know they can use it, while
  48  * still preventing hotplug PCI devices from using it.
  49  */
  50
  51 /*
  52  * When CONFIG_PNP is enabled, pnp/system.c binds to PNP0C01
  53  * and PNP0C02, redundant with acpi_reserve_io_ranges().
  54  * But acpi_reserve_io_ranges() is necessary for !CONFIG_PNP.
  55  */
  56 static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
  57 {
  58         struct resource *requested_res = NULL;
  59
  60
  61         if (res->type == ACPI_RESOURCE_TYPE_IO) {
  62                 struct acpi_resource_io *io_res = &res->data.io;
  63
  64                 if (io_res->minimum != io_res->maximum)
  65                         return AE_OK;
  66                 if (IS_RESERVED_ADDR
  67                     (io_res->minimum, io_res->address_length)) {
  68                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  69                                           "Motherboard resources 0x%08x - 0x%08x\n",
  70                                           io_res->minimum,
  71                                           io_res->minimum +
  72                                           io_res->address_length));
  73                         requested_res =
  74                             request_region(io_res->minimum,
  75                                            io_res->address_length, "motherboard");
  76                 }
  77         } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
  78                 struct acpi_resource_fixed_io *fixed_io_res =
  79                     &res->data.fixed_io;
  80
  81                 if (IS_RESERVED_ADDR
  82                     (fixed_io_res->address, fixed_io_res->address_length)) {
  83                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  84                                           "Motherboard resources 0x%08x - 0x%08x\n",
  85                                           fixed_io_res->address,
  86                                           fixed_io_res->address +
  87                                           fixed_io_res->address_length));
  88                         requested_res =
  89                             request_region(fixed_io_res->address,
  90                                            fixed_io_res->address_length,
  91                                            "motherboard");
  92                 }
  93         } else {
  94                 /* Memory mapped IO? */
  95         }
  96
  97         if (requested_res)
  98                 requested_res->flags &= ~IORESOURCE_BUSY;
  99         return AE_OK;
 100 }
 101
 102 static int acpi_motherboard_add(struct acpi_device *device)
 103 {
 104         if (!device)
 105                 return -EINVAL;
 106         acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 107                             acpi_reserve_io_ranges, NULL);
 108
 109         return 0;
 110 }
 111
 112 static struct acpi_driver acpi_motherboard_driver = {
 113         .name = "motherboard",
 114         .class = "",
 115         .ids = ACPI_MB_HID,
 116         .ops = {
 117                 .add = acpi_motherboard_add,
 118                 },
 119 };
 120
 121 static void __init acpi_request_region (struct acpi_generic_address *addr,
 122         unsigned int length, char *desc)
 123 {
 124         if (!addr->address || !length)
 125                 return;
 126
 127         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 128                 request_region(addr->address, length, desc);
 129         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 130                 request_mem_region(addr->address, length, desc);
 131 }
 132
 133 static void __init acpi_reserve_resources(void)
 134 {
 135         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block,
 136                                acpi_gbl_FADT.pm1_event_length, "ACPI PM1a_EVT_BLK");
 137
 138         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block,
 139                                acpi_gbl_FADT.pm1_event_length, "ACPI PM1b_EVT_BLK");
 140
 141         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block,
 142                                acpi_gbl_FADT.pm1_control_length, "ACPI PM1a_CNT_BLK");
 143
 144         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block,
 145                                acpi_gbl_FADT.pm1_control_length, "ACPI PM1b_CNT_BLK");
 146
 147         if (acpi_gbl_FADT.pm_timer_length == 4)
 148                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 149
 150         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block,
 151                                acpi_gbl_FADT.pm2_control_length, "ACPI PM2_CNT_BLK");
 152
 153         /* Length of GPE blocks must be a non-negative multiple of 2 */
 154
 155         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 156                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 157                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 158
 159         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 160                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 161                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 162 }
 163
 164 static int __init acpi_motherboard_init(void)
 165 {
 166         acpi_bus_register_driver(&acpi_motherboard_driver);
 167         /*
 168          * Guarantee motherboard IO reservation first
 169          * This module must run after scan.c
 170          */
 171         if (!acpi_disabled)
 172                 acpi_reserve_resources();
 173         return 0;
 174 }
 175
 176 /**
 177  * Reserve motherboard resources after PCI claim BARs,
 178  * but before PCI assign resources for uninitialized PCI devices
 179  */
 180 fs_initcall(acpi_motherboard_init);