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
  56         if (res->type == ACPI_RESOURCE_TYPE_IO) {
  57                 struct acpi_resource_io *io_res = &res->data.io;
  58
  59                 if (io_res->minimum != io_res->maximum)
  60                         return AE_OK;
  61                 if (IS_RESERVED_ADDR
  62                     (io_res->minimum, io_res->address_length)) {
  63                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  64                                           "Motherboard resources 0x%08x - 0x%08x\n",
  65                                           io_res->minimum,
  66                                           io_res->minimum +
  67                                           io_res->address_length));
  68                         requested_res =
  69                             request_region(io_res->minimum,
  70                                            io_res->address_length, "motherboard");
  71                 }
  72         } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
  73                 struct acpi_resource_fixed_io *fixed_io_res =
  74                     &res->data.fixed_io;
  75
  76                 if (IS_RESERVED_ADDR
  77                     (fixed_io_res->address, fixed_io_res->address_length)) {
  78                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  79                                           "Motherboard resources 0x%08x - 0x%08x\n",
  80                                           fixed_io_res->address,
  81                                           fixed_io_res->address +
  82                                           fixed_io_res->address_length));
  83                         requested_res =
  84                             request_region(fixed_io_res->address,
  85                                            fixed_io_res->address_length,
  86                                            "motherboard");
  87                 }
  88         } else {
  89                 /* Memory mapped IO? */
  90         }
  91
  92         if (requested_res)
  93                 requested_res->flags &= ~IORESOURCE_BUSY;
  94         return AE_OK;
  95 }
  96
  97 static int acpi_motherboard_add(struct acpi_device *device)
  98 {
  99         if (!device)
 100                 return -EINVAL;
 101         acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 102                             acpi_reserve_io_ranges, NULL);
 103
 104         return 0;
 105 }
 106
 107 static struct acpi_driver acpi_motherboard_driver1 = {
 108         .name = "motherboard",
 109         .class = "",
 110         .ids = ACPI_MB_HID1,
 111         .ops = {
 112                 .add = acpi_motherboard_add,
 113                 },
 114 };
 115
 116 static struct acpi_driver acpi_motherboard_driver2 = {
 117         .name = "motherboard",
 118         .class = "",
 119         .ids = ACPI_MB_HID2,
 120         .ops = {
 121                 .add = acpi_motherboard_add,
 122                 },
 123 };
 124
 125 static void __init acpi_request_region (struct acpi_generic_address *addr,
 126         unsigned int length, char *desc)
 127 {
 128         if (!addr->address || !length)
 129                 return;
 130
 131         if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 132                 request_region(addr->address, length, desc);
 133         else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 134                 request_mem_region(addr->address, length, desc);
 135 }
 136
 137 static void __init acpi_reserve_resources(void)
 138 {
 139         acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
 140                                acpi_gbl_FADT->pm1_evt_len, "ACPI PM1a_EVT_BLK");
 141
 142         acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
 143                                acpi_gbl_FADT->pm1_evt_len, "ACPI PM1b_EVT_BLK");
 144
 145         acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
 146                                acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1a_CNT_BLK");
 147
 148         acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
 149                                acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1b_CNT_BLK");
 150
 151         if (acpi_gbl_FADT->pm_tm_len == 4)
 152                 acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "ACPI PM_TMR");
 153
 154         acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
 155                                acpi_gbl_FADT->pm2_cnt_len, "ACPI PM2_CNT_BLK");
 156
 157         /* Length of GPE blocks must be a non-negative multiple of 2 */
 158
 159         if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
 160                 acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
 161                                acpi_gbl_FADT->gpe0_blk_len, "ACPI GPE0_BLK");
 162
 163         if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
 164                 acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
 165                                acpi_gbl_FADT->gpe1_blk_len, "ACPI GPE1_BLK");
 166 }
 167
 168 static int __init acpi_motherboard_init(void)
 169 {
 170         acpi_bus_register_driver(&acpi_motherboard_driver1);
 171         acpi_bus_register_driver(&acpi_motherboard_driver2);
 172         /*
 173          * Guarantee motherboard IO reservation first
 174          * This module must run after scan.c
 175          */
 176         if (!acpi_disabled)
 177                 acpi_reserve_resources();
 178         return 0;
 179 }
 180
 181 /**
 182  * Reserve motherboard resources after PCI claim BARs,
 183  * but before PCI assign resources for uninitialized PCI devices
 184  */
 185 fs_initcall(acpi_motherboard_init);