src/mainboard/lenovo/l520/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/common/pmutil.h>
   9 #include <southbridge/intel/bd82x6x/pch.h>
  10
  11 #define GPE_EC_SCI      6
  12 /* FIXME: check this */
  13 #define GPE_EC_WAKE     13
  14
  15 static void mainboard_smi_handle_ec_sci(void)
  16 {
  17         u8 status = inb(EC_SC);
  18         u8 event;
  19
  20         if (!(status & EC_SCI_EVT))
  21                 return;
  22
  23         event = ec_query();
  24         printk(BIOS_DEBUG, "EC event %#02x\n", event);
  25 }
  26
  27 void mainboard_smi_gpi(u32 gpi_sts)
  28 {
  29         if (gpi_sts & (1 << GPE_EC_SCI))
  30                 mainboard_smi_handle_ec_sci();
  31 }
  32
  33 int mainboard_smi_apmc(u8 data)
  34 {
  35         switch (data) {
  36         case APM_CNT_ACPI_ENABLE:
  37                 /* use 0x1600/0x1604 to prevent races with userspace */
  38                 ec_set_ports(0x1604, 0x1600);
  39                 /* route EC_SCI to SCI */
  40                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
  41                 /* discard all events, and enable attention */
  42                 ec_write(0x80, 0x01);
  43                 break;
  44         case APM_CNT_ACPI_DISABLE:
  45                 /* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
  46                    provide a EC query function */
  47                 ec_set_ports(0x66, 0x62);
  48                 /* route EC_SCI to SMI */
  49                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
  50                 /* discard all events, and enable attention */
  51                 ec_write(0x80, 0x01);
  52                 break;
  53         default:
  54                 break;
  55         }
  56         return 0;
  57 }
  58
  59 void mainboard_smi_sleep(u8 slp_typ)
  60 {
  61         if (slp_typ == 3) {
  62                 u8 ec_wake = ec_read(0x32);
  63                 /* If EC wake events are enabled, enable wake on EC WAKE GPE. */
  64                 if (ec_wake & 0x14) {
  65                         /* Redirect EC WAKE GPE to SCI. */
  66                         gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
  67                 }
  68         }
  69 }