src/mainboard/lenovo/haswell/smihandler.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <device/pci_ops.h>
   5 #include <console/console.h>
   6 #include <cpu/x86/smm.h>
   7 #include <ec/acpi/ec.h>
   8 #include <ec/lenovo/h8/h8.h>
   9 #include <southbridge/intel/lynxpoint/pch.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 /* lynxpoint doesn't have gpi_route_interrupt, so add it */
  33 #define GPI_DISABLE 0x00
  34 #define GPI_IS_SMI 0x01
  35 #define GPI_IS_SCI 0x02
  36 #define GPI_IS_NMI 0x03
  37
  38 static void gpi_route_interrupt(u8 gpi, u8 mode)
  39 {
  40         u32 gpi_rout;
  41
  42         gpi_rout = pci_read_config32(PCI_DEV(0, 0x1f, 0), GPIO_ROUT);
  43         gpi_rout &= ~(3 << (2 * gpi));
  44         gpi_rout |= ((mode & 3) << (2 * gpi));
  45         pci_write_config32(PCI_DEV(0, 0x1f, 0), GPIO_ROUT, gpi_rout);
  46 }
  47
  48 int mainboard_smi_apmc(u8 data)
  49 {
  50         switch (data) {
  51         case APM_CNT_ACPI_ENABLE:
  52                 /* use 0x1600/0x1604 to prevent races with userspace */
  53                 ec_set_ports(0x1604, 0x1600);
  54                 /* route EC_SCI to SCI */
  55                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
  56                 /* discard all events, and enable attention */
  57                 ec_write(0x80, 0x01);
  58                 break;
  59         case APM_CNT_ACPI_DISABLE:
  60                 /* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
  61                    provide a EC query function */
  62                 ec_set_ports(0x66, 0x62);
  63                 /* route EC_SCI to SMI */
  64                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
  65                 /* discard all events, and enable attention */
  66                 ec_write(0x80, 0x01);
  67                 break;
  68         default:
  69                 break;
  70         }
  71         return 0;
  72 }
  73
  74 void mainboard_smi_sleep(u8 slp_typ)
  75 {
  76         if (slp_typ == 3) {
  77                 u8 ec_wake = ec_read(0x32);
  78                 /* If EC wake events are enabled,
  79                  * enable wake on EC WAKE GPE. */
  80                 if (ec_wake & 0x14) {
  81                         /* Redirect EC WAKE GPE to SCI. */
  82                         gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
  83                 }
  84         }
  85 }