src/southbridge/intel/lynxpoint/acpi.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpi.h>
   4 #include <acpi/acpi_gnvs.h>
   5 #include <acpi/acpigen.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <version.h>
   9 #include <soc/nvs.h>
  10
  11 #include "pch.h"
  12
  13 static void acpi_create_serialio_ssdt_entry(int id, struct global_nvs *gnvs)
  14 {
  15         char sio_name[5] = {};
  16         snprintf(sio_name, sizeof(sio_name), "S%1uEN", id);
  17         acpigen_write_name_byte(sio_name, gnvs->s0b[id] ? 1 : 0);
  18 }
  19
  20 void acpi_create_serialio_ssdt(acpi_header_t *ssdt)
  21 {
  22         unsigned long current = (unsigned long)ssdt + sizeof(acpi_header_t);
  23         struct global_nvs *gnvs = acpi_get_gnvs();
  24         int id;
  25
  26         if (!gnvs)
  27                 return;
  28
  29         /* Fill the SSDT header */
  30         memset((void *)ssdt, 0, sizeof(acpi_header_t));
  31         memcpy(&ssdt->signature, "SSDT", 4);
  32         ssdt->revision = get_acpi_table_revision(SSDT);
  33         memcpy(&ssdt->oem_id, OEM_ID, 6);
  34         memcpy(&ssdt->oem_table_id, "SERIALIO", 8);
  35         ssdt->oem_revision = 43;
  36         memcpy(&ssdt->asl_compiler_id, ASLC, 4);
  37         ssdt->asl_compiler_revision = asl_revision;
  38         ssdt->length = sizeof(acpi_header_t);
  39         acpigen_set_current((char *)current);
  40
  41         /* Fill the SSDT with an entry for each SerialIO device */
  42         for (id = 0; id < 8; id++)
  43                 acpi_create_serialio_ssdt_entry(id, gnvs);
  44
  45         /* (Re)calculate length and checksum. */
  46         current = (unsigned long)acpigen_get_current();
  47         ssdt->length = current - (unsigned long)ssdt;
  48         ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
  49 }