src/southbridge/intel/i82801ix/smihandler.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <types.h>
   4 #include <console/console.h>
   5 #include <cpu/x86/smm.h>
   6 #include <device/pci_def.h>
   7 #include <southbridge/intel/common/pmutil.h>
   8 #include "i82801ix.h"
   9
  10 #include <soc/nvs.h>
  11
  12 void southbridge_smi_monitor(void)
  13 {
  14 #define IOTRAP(x) (trap_sts & (1 << x))
  15         u32 trap_sts, trap_cycle;
  16         u32 data, mask = 0;
  17         int i;
  18
  19         trap_sts = RCBA32(0x1e00); // TRSR - Trap Status Register
  20         RCBA32(0x1e00) = trap_sts; // Clear trap(s) in TRSR
  21
  22         trap_cycle = RCBA32(0x1e10);
  23         for (i=16; i<20; i++) {
  24                 if (trap_cycle & (1 << i))
  25                         mask |= (0xff << ((i - 16) << 3));
  26         }
  27
  28         /* IOTRAP(3) SMI function call */
  29         if (IOTRAP(3)) {
  30                 if (gnvs && gnvs->smif)
  31                         io_trap_handler(gnvs->smif); // call function smif
  32                 return;
  33         }
  34
  35         /* IOTRAP(2) currently unused
  36          * IOTRAP(1) currently unused */
  37
  38         /* IOTRAP(0) SMIC */
  39         if (IOTRAP(0)) {
  40                 if (!(trap_cycle & (1 << 24))) { // It's a write
  41                         printk(BIOS_DEBUG, "SMI1 command\n");
  42                         data = RCBA32(0x1e18);
  43                 }
  44                 // Fall through to debug
  45         }
  46
  47         printk(BIOS_DEBUG, "  trapped io address = 0x%x\n", trap_cycle & 0xfffc);
  48         for (i=0; i < 4; i++) if (IOTRAP(i)) printk(BIOS_DEBUG, "  TRAP = %d\n", i);
  49         printk(BIOS_DEBUG, "  AHBE = %x\n", (trap_cycle >> 16) & 0xf);
  50         printk(BIOS_DEBUG, "  MASK = 0x%08x\n", mask);
  51         printk(BIOS_DEBUG, "  read/write: %s\n", (trap_cycle & (1 << 24)) ? "read" : "write");
  52
  53         if (!(trap_cycle & (1 << 24))) {
  54                 /* Write Cycle */
  55                 data = RCBA32(0x1e18);
  56                 printk(BIOS_DEBUG, "  iotrap written data = 0x%08x\n", data);
  57         }
  58 #undef IOTRAP
  59 }
  60
  61 void southbridge_finalize_all(void)
  62 {
  63 }