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
  52 /*
  53  * When CONFIG_PNP is enabled, pnp/system.c binds to PNP0C01
  54  * and PNP0C02, redundant with acpi_reserve_io_ranges().
  55  * But acpi_reserve_io_ranges() is necessary for !CONFIG_PNP.
  56  */
  57 static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
  58 {
  59         struct resource *requested_res = NULL;
  60
  61
  62         if (res->type == ACPI_RESOURCE_TYPE_IO) {
  63                 struct acpi_resource_io *io_res = &res->data.io;
  64
  65                 if (io_res->minimum != io_res->maximum)
  66                         return AE_OK;
  67                 if (IS_RESERVED_ADDR
  68                     (io_res->minimum, io_res->address_length)) {
  69                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  70                                           "Motherboard resources 0x%08x - 0x%08x\n",
  71                                           io_res->minimum,
  72                                           io_res->minimum +
  73                                           io_res->address_length));
  74                         requested_res =
  75                             request_region(io_res->minimum,
  76                                            io_res->address_length, "motherboard");
  77                 }
  78         } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
  79                 struct acpi_resource_fixed_io *fixed_io_res =
  80                     &res->data.fixed_io;
  81
  82                 if (IS_RESERVED_ADDR
  83                     (fixed_io_res->address, fixed_io_res->address_length)) {
  84                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  85                                           "Motherboard resources 0x%08x - 0x%08x\n",
  86                                           fixed_io_res->address,
  87                                           fixed_io_res->address +
  88                                           fixed_io_res->address_length));
  89                         requested_res =
  90                             request_region(fixed_io_res->address,
  91                                            fixed_io_res->address_length,
  92                                            "motherboard");
  93                 }
  94         } else {
  95                 /* Memory mapped IO? */
  96         }
  97
  98         if (requested_res)
  99                 requested_res->flags &= ~IORESOURCE_BUSY;
 100         return AE_OK;
 101 }
 102
 103 static int acpi_motherboard_add(struct acpi_device *device)
 104 {
 105         if (!device)
 106                 return -EINVAL;
 107         acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 108                             acpi_reserve_io_ranges, NULL);
 109
 110         return 0;
 111 }
 112
 113 static struct acpi_driver acpi_motherboard_driver1 = {
 114         .name = "motherboard",
 115         .class = "",
 116         .ids = ACPI_MB_HID1,
 117         .ops = {
 118                 .add = acpi_motherboard_add,
 119                 },
 120 };
 121
 122 static struct acpi_driver acpi_motherboard_driver2 = {
 123         .name = "motherboard",
 124         .class = "",
 125         .ids = ACPI_MB_HID2,
 126         .ops = {
 127                 .add = acpi_motherboard_add,
 128                 },
 129 };
 130
 131 static void __init acpi_request_region (struct acpi_generic_address *addr,
 132         unsigned int length, char *desc)
 133 {
 134         if (!addr->address || !length)
 135                 return;
 136
 137         if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 138                 request_region(addr->address, length, desc);
 139         else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 140                 request_mem_region(addr->address, length, desc);
 141 }
 142
 143 static void __init acpi_reserve_resources(void)
 144 {
 145         acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
 146                                acpi_gbl_FADT->pm1_evt_len, "ACPI PM1a_EVT_BLK");
 147
 148         acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
 149                                acpi_gbl_FADT->pm1_evt_len, "ACPI PM1b_EVT_BLK");
 150
 151         acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
 152                                acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1a_CNT_BLK");
 153
 154         acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
 155                                acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1b_CNT_BLK");
 156
 157         if (acpi_gbl_FADT->pm_tm_len == 4)
 158                 acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "ACPI PM_TMR");
 159
 160         acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
 161                                acpi_gbl_FADT->pm2_cnt_len, "ACPI PM2_CNT_BLK");
 162
 163         /* Length of GPE blocks must be a non-negative multiple of 2 */
 164
 165         if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
 166                 acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
 167                                acpi_gbl_FADT->gpe0_blk_len, "ACPI GPE0_BLK");
 168
 169         if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
 170                 acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
 171                                acpi_gbl_FADT->gpe1_blk_len, "ACPI GPE1_BLK");
 172 }
 173
 174 static int __init acpi_motherboard_init(void)
 175 {
 176         acpi_bus_register_driver(&acpi_motherboard_driver1);
 177         acpi_bus_register_driver(&acpi_motherboard_driver2);
 178         /*
 179          * Guarantee motherboard IO reservation first
 180          * This module must run after scan.c
 181          */
 182         if (!acpi_disabled)
 183                 acpi_reserve_resources();
 184         return 0;
 185 }
 186
 187 /**
 188  * Reserve motherboard resources after PCI claim BARs,
 189  * but before PCI assign resources for uninitialized PCI devices
 190  */
 191 fs_initcall(acpi_motherboard_init);