src/mainboard/lenovo/t420s/smihandler.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <console/console.h>
   5 #include <cpu/x86/smm.h>
   6 #include <ec/acpi/ec.h>
   7 #include <ec/lenovo/h8/h8.h>
   8 #include <southbridge/intel/bd82x6x/pch.h>
   9 #include <southbridge/intel/common/pmutil.h>
  10
  11 #define GPE_EC_SCI      1
  12 #define GPE_EC_WAKE     13
  13
  14 static void mainboard_smi_handle_ec_sci(void)
  15 {
  16         u8 status = inb(EC_SC);
  17         u8 event;
  18
  19         if (!(status & EC_SCI_EVT))
  20                 return;
  21
  22         event = ec_query();
  23         printk(BIOS_DEBUG, "EC event %#02x\n", event);
  24 }
  25
  26 void mainboard_smi_gpi(u32 gpi_sts)
  27 {
  28         if (gpi_sts & (1 << GPE_EC_SCI))
  29                 mainboard_smi_handle_ec_sci();
  30 }
  31
  32 int mainboard_smi_apmc(u8 data)
  33 {
  34         switch (data) {
  35                 case APM_CNT_ACPI_ENABLE:
  36                         /* use 0x1600/0x1604 to prevent races with userspace */
  37                         ec_set_ports(0x1604, 0x1600);
  38                         /* route EC_SCI to SCI */
  39                         gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
  40                         /* discard all events, and enable attention */
  41                         ec_write(0x80, 0x01);
  42                         break;
  43                 case APM_CNT_ACPI_DISABLE:
  44                         /* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
  45                            provide a EC query function */
  46                         ec_set_ports(0x66, 0x62);
  47                         /* route EC_SCI to SMI */
  48                         gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
  49                         /* discard all events, and enable attention */
  50                         ec_write(0x80, 0x01);
  51                         break;
  52                 default:
  53                         break;
  54         }
  55         return 0;
  56 }
  57
  58 void mainboard_smi_sleep(u8 slp_typ)
  59 {
  60         if (slp_typ == 3) {
  61                 u8 ec_wake = ec_read(0x32);
  62                 /* If EC wake events are enabled, enable wake on EC WAKE GPE. */
  63                 if (ec_wake & 0x14) {
  64                         /* Redirect EC WAKE GPE to SCI. */
  65                         gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
  66                 }
  67         }
  68 }