src/mainboard/getac/p470/acpi_tables.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <string.h>
   4 #include <console/console.h>
   5 #include <acpi/acpi.h>
   6 #include <device/device.h>
   7
   8 #include "mainboard.h"
   9
  10 static long acpi_create_ecdt(acpi_ecdt_t * ecdt)
  11 {
  12         /* Attention: Make sure these match the values from
  13          * the DSDT's ec.asl
  14          */
  15         static const char ec_id[] = "\\_SB.PCI0.LPCB.EC0";
  16         int ecdt_len = sizeof(acpi_ecdt_t) + strlen(ec_id) + 1;
  17
  18         acpi_header_t *header = &(ecdt->header);
  19
  20         memset((void *)ecdt, 0, ecdt_len);
  21
  22         /* fill out header fields */
  23         memcpy(header->signature, "ECDT", 4);
  24         memcpy(header->oem_id, OEM_ID, 6);
  25         memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
  26         memcpy(header->asl_compiler_id, ASLC, 4);
  27
  28         header->length = ecdt_len;
  29         header->revision = 1;
  30
  31         /* Location of the two EC registers */
  32         ecdt->ec_control.space_id = ACPI_ADDRESS_SPACE_IO;
  33         ecdt->ec_control.bit_width = 8;
  34         ecdt->ec_control.bit_offset = 0;
  35         ecdt->ec_control.addrl = 0x66;
  36         ecdt->ec_control.addrh = 0;
  37
  38         ecdt->ec_data.space_id = ACPI_ADDRESS_SPACE_IO;
  39         ecdt->ec_data.bit_width = 8;
  40         ecdt->ec_data.bit_offset = 0;
  41         ecdt->ec_data.addrl = 0x62;
  42         ecdt->ec_data.addrh = 0;
  43
  44         ecdt->uid = 1; // Must match _UID of the EC0 node.
  45
  46         ecdt->gpe_bit = 23; // SCI interrupt within GPEx_STS
  47
  48         memcpy(ecdt->ec_id, ec_id, sizeof(ec_id));
  49
  50         header->checksum =
  51             acpi_checksum((void *)ecdt, ecdt_len);
  52
  53         return header->length;
  54 }
  55
  56 unsigned long mainboard_write_acpi_tables(const struct device *device,
  57                                           unsigned long start,
  58                                           acpi_rsdp_t *rsdp)
  59 {
  60         unsigned long current;
  61         acpi_header_t *ecdt;
  62
  63         current = start;
  64
  65         /* Align ACPI tables to 16byte */
  66         current = acpi_align_current(current);
  67
  68         printk(BIOS_DEBUG, "ACPI:     * ECDT\n");
  69         ecdt = (acpi_header_t *)current;
  70         current += acpi_create_ecdt((acpi_ecdt_t *)current);
  71         current = acpi_align_current(current);
  72         acpi_add_table(rsdp, ecdt);
  73
  74         printk(BIOS_DEBUG, "current = %lx\n", current);
  75         return current;
  76 }