src/mainboard/lenovo/s230u/smihandler.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <cpu/x86/smm.h>
   5 #include <ec/acpi/ec.h>
   6 #include <ec/compal/ene932/ec.h>
   7 #include <southbridge/intel/bd82x6x/pch.h>
   8 #include <southbridge/intel/common/pmutil.h>
   9
  10 #include "ec.h"
  11
  12 #define GPE_PALMDET1    2
  13 #define GPE_PALMDET2    4
  14 #define GPE_EC_SCI      7
  15 #define GPE_EC_SMI      8
  16 /* FIXME: check this */
  17 #define GPE_EC_WAKE     13
  18
  19 enum sleep_states {
  20         S0 = 0,
  21         S1 = 1,
  22         S3 = 3,
  23         S4 = 4,
  24         S5 = 5,
  25 };
  26
  27 enum ec_smi_event {
  28         EC_SMI_EVENT_IDLE = 0x80,
  29         EC_SMI_BATTERY_LOW = 0xb3,
  30 };
  31
  32 /* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs. */
  33 static void ec_enter_apm_mode(void)
  34 {
  35         ec_kbc_write_cmd(0x59);
  36         ec_kbc_write_ib(0xE9);
  37 }
  38 /* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs. */
  39 static void ec_enter_acpi_mode(void)
  40 {
  41         ec_kbc_write_cmd(0x59);
  42         ec_kbc_write_ib(0xE8);
  43 }
  44
  45 static uint8_t ec_get_smi_event(void)
  46 {
  47         ec_kbc_write_cmd(0x56);
  48         return ec_kbc_read_ob();
  49 }
  50
  51 static void ec_process_smi(uint8_t src)
  52 {
  53         /*
  54          * Reading the SMI source satisfies the EC in terms of responding to
  55          * the event, regardless of whether we take an action or not.
  56          */
  57
  58         printk(BIOS_DEBUG, "Unhandled EC_SMI event 0x%x\n", src);
  59 }
  60
  61 static void handle_ec_smi(void)
  62 {
  63         uint8_t src;
  64
  65         while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE)
  66                 ec_process_smi(src);
  67 }
  68
  69 void mainboard_smi_gpi(u32 gpi_sts)
  70 {
  71         if (gpi_sts & (1 << GPE_EC_SMI))
  72                 handle_ec_smi();
  73 }
  74
  75 int mainboard_smi_apmc(u8 data)
  76 {
  77         switch (data) {
  78         case APM_CNT_ACPI_ENABLE:
  79                 ec_enter_acpi_mode();
  80                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
  81                 gpi_route_interrupt(GPE_PALMDET1, GPI_IS_SCI);
  82                 gpi_route_interrupt(GPE_PALMDET2, GPI_IS_SCI);
  83                 break;
  84         case APM_CNT_ACPI_DISABLE:
  85                 ec_enter_apm_mode();
  86                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
  87                 break;
  88         default:
  89                 printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data);
  90         }
  91         return 0;
  92 }
  93
  94 void mainboard_smi_sleep(u8 slp_typ)
  95 {
  96         if (slp_typ == S3) {
  97                 u8 ec_wake = ec_read(0x32);
  98                 /* If EC wake events are enabled, enable wake on EC WAKE GPE. */
  99                 if (ec_wake & 0x14)
 100                         gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
 101         }
 102 }