src/mainboard/emulation/qemu-i440fx/acpi/hpet.asl

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/hpet.h>
   4
   5 /****************************************************************
   6  * HPET
   7  ****************************************************************/
   8
   9 Scope(\_SB) {
  10     Device(HPET) {
  11         Name(_HID, EISAID("PNP0103"))
  12         Name(_UID, 0)
  13         OperationRegion(HPTM, SystemMemory, HPET_BASE_ADDRESS, 0x400)
  14         Field(HPTM, DWordAcc, Lock, Preserve) {
  15             VEND, 32,
  16             PRD, 32,
  17         }
  18         Method(_STA, 0, NotSerialized) {
  19             Local0 = VEND
  20             Local1 = PRD
  21             Local0 >>= 16
  22             If ((Local0 == 0) || (Local0 == 0xffff)) {
  23                 Return (0x0)
  24             }
  25             If ((Local1 == 0) || (Local1 > 100000000)) {
  26                 Return (0x0)
  27             }
  28             Return (0x0F)
  29         }
  30         Name(_CRS, ResourceTemplate() {
  31             Memory32Fixed(ReadOnly,
  32                 HPET_BASE_ADDRESS,  // Address Base
  33                 0x00000400,         // Address Length
  34                 )
  35         })
  36     }
  37 }