src/mainboard/lenovo/g505s/smihandler.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /*
   4  * SMI handler -- mostly takes care of SMIs from the EC
   5  */
   6
   7 #include <arch/io.h>
   8 #include <console/console.h>
   9 #include <cpu/x86/smm.h>
  10 #include <ec/compal/ene932/ec.h>
  11 #include <southbridge/amd/agesa/hudson/hudson.h>
  12 #include <southbridge/amd/agesa/hudson/smi.h>
  13
  14 #include "ec.h"
  15
  16 #define ACPI_PM1_CNT_SLEEP(state) ((1 << 13) | (state & 0x7) << 10)
  17
  18 enum sleep_states {
  19         S0 = 0,
  20         S1 = 1,
  21         S3 = 3,
  22         S4 = 4,
  23         S5 = 5,
  24 };
  25
  26 enum ec_smi_event {
  27         EC_SMI_EVENT_IDLE = 0x80,
  28         EC_SMI_BATTERY_LOW = 0xb3,
  29 };
  30
  31 /* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs */
  32 static void ec_enter_apm_mode(void)
  33 {
  34         ec_kbc_write_cmd(0x59);
  35         ec_kbc_write_ib(0xE9);
  36 }
  37 /* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs */
  38 static void ec_enter_acpi_mode(void)
  39 {
  40         ec_kbc_write_cmd(0x59);
  41         ec_kbc_write_ib(0xE8);
  42 }
  43
  44 static uint8_t ec_get_smi_event(void)
  45 {
  46         ec_kbc_write_cmd(0x56);
  47         return ec_kbc_read_ob();
  48 }
  49
  50 static void ec_process_smi(uint8_t src)
  51 {
  52         /* Reading the SMI source satisfies the EC in terms of responding to
  53          * the event, regardless of whether we take an action or not.
  54          */
  55
  56         switch (src) {
  57         case EC_SMI_BATTERY_LOW:
  58                 printk(BIOS_DEBUG, "Battery low. Shutting down\n");
  59                 outl(ACPI_PM1_CNT_SLEEP(S5), ACPI_PM1_CNT_BLK);
  60                 break;
  61         default:
  62                 printk(BIOS_DEBUG, "EC_SMI event 0x%x\n", src);
  63         }
  64 }
  65
  66 static void handle_ec_smi(void)
  67 {
  68         uint8_t src;
  69
  70         while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE)
  71                 ec_process_smi(src);
  72 }
  73
  74 static void handle_lid_smi(void)
  75 {
  76         /* Only triggered in non-ACPI mode on lid close. */
  77         outl(ACPI_PM1_CNT_SLEEP(S4), ACPI_PM1_CNT_BLK);
  78 }
  79
  80 int mainboard_smi_apmc(uint8_t data)
  81 {
  82         switch (data) {
  83         case ACPI_SMI_CMD_ENABLE:
  84                 printk(BIOS_DEBUG, "Enable ACPI mode\n");
  85                 ec_enter_acpi_mode();
  86                 hudson_disable_gevent_smi(EC_LID_GEVENT);
  87                 break;
  88         case ACPI_SMI_CMD_DISABLE:
  89                 printk(BIOS_DEBUG, "Disable ACPI mode\n");
  90                 ec_enter_apm_mode();
  91                 hudson_configure_gevent_smi(EC_LID_GEVENT, SMI_MODE_SMI,
  92                                             SMI_LVL_LOW);
  93                 break;
  94         default:
  95                 printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data);
  96         }
  97         return 0;
  98 }
  99
 100 void mainboard_smi_gpi(uint32_t gpi_sts)
 101 {
 102         if (gpi_sts & (1 << EC_SMI_GEVENT))
 103                 handle_ec_smi();
 104         if (gpi_sts & (1 << EC_LID_GEVENT))
 105                 handle_lid_smi();
 106 }