arch/x86/lib/acpigen.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2020 Google LLC
   4  */
   5
   6 #include <acpi/acpigen.h>
   7 #include <acpi/acpi_table.h>
   8 #include <asm/acpigen.h>
   9
  10 void acpigen_write_empty_pct(struct acpi_ctx *ctx)
  11 {
  12         /*
  13          * Name (_PCT, Package (0x02)
  14          * {
  15          *      ResourceTemplate ()
  16          *      {
  17          *              Register (FFixedHW,
  18          *                      0x00,               // Bit Width
  19          *                      0x00,               // Bit Offset
  20          *                      0x0000000000000000, // Address
  21          *                      ,)
  22          *      },
  23          *
  24          *      ResourceTemplate ()
  25          *      {
  26          *              Register (FFixedHW,
  27          *                      0x00,               // Bit Width
  28          *                      0x00,               // Bit Offset
  29          *                      0x0000000000000000, // Address
  30          *                      ,)
  31          *      }
  32          * })
  33          */
  34         static char stream[] = {
  35                 /* 00000030    "0._PCT.," */
  36                 0x08, 0x5f, 0x50, 0x43, 0x54, 0x12, 0x2c,
  37                 /* 00000038    "........" */
  38                 0x02, 0x11, 0x14, 0x0a, 0x11, 0x82, 0x0c, 0x00,
  39                 /* 00000040    "........" */
  40                 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  41                 /* 00000048    "....y..." */
  42                 0x00, 0x00, 0x00, 0x00, 0x79, 0x00, 0x11, 0x14,
  43                 /* 00000050    "........" */
  44                 0x0a, 0x11, 0x82, 0x0c, 0x00, 0x7f, 0x00, 0x00,
  45                 /* 00000058    "........" */
  46                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  47                 0x00, 0x79, 0x00
  48         };
  49         acpigen_emit_stream(ctx, stream, ARRAY_SIZE(stream));
  50 }
  51
  52 void acpigen_write_empty_ptc(struct acpi_ctx *ctx)
  53 {
  54         /*
  55          * Name (_PTC, Package (0x02)
  56          * {
  57          *      ResourceTemplate ()
  58          *      {
  59          *              Register (FFixedHW,
  60          *                      0x00,               // Bit Width
  61          *                      0x00,               // Bit Offset
  62          *                      0x0000000000000000, // Address
  63          *                      ,)
  64          *      },
  65          *
  66          *      ResourceTemplate ()
  67          *      {
  68          *              Register (FFixedHW,
  69          *                      0x00,               // Bit Width
  70          *                      0x00,               // Bit Offset
  71          *                      0x0000000000000000, // Address
  72          *                      ,)
  73          *      }
  74          * })
  75          */
  76         struct acpi_gen_regaddr addr = {
  77                 .space_id    = ACPI_ADDRESS_SPACE_FIXED,
  78                 .bit_width   = 0,
  79                 .bit_offset  = 0,
  80                 .access_size = 0,
  81                 .addrl       = 0,
  82                 .addrh       = 0,
  83         };
  84
  85         acpigen_write_name(ctx, "_PTC");
  86         acpigen_write_package(ctx, 2);
  87
  88         /* ControlRegister */
  89         acpigen_write_register_resource(ctx, &addr);
  90
  91         /* StatusRegister */
  92         acpigen_write_register_resource(ctx, &addr);
  93
  94         acpigen_pop_len(ctx);
  95 }