Documentation/mainboard_io_trap_handler_sample.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 <soc/pm.h>
   7 #include <soc/smm.h>
   8 #include <elog.h>
   9 #include <ec/google/chromeec/ec.h>
  10 #include <soc/gpio.h>
  11 #include <soc/iomap.h>
  12 #include <soc/nvs.h>
  13 #include <soc/pm.h>
  14 #include <soc/smm.h>
  15 #include "ec.h"
  16 #include "gpio.h"
  17
  18 int mainboard_io_trap_handler(int smif)
  19 {
  20        switch (smif) {
  21        case 0x99:
  22                printk(BIOS_DEBUG, "Sample\n");
  23                gnvs->smif = 0;
  24                break;
  25        default:
  26                return 0;
  27        }
  28
  29        /* On success, the IO Trap Handler returns 0
  30         * On failure, the IO Trap Handler returns a value != 0
  31         *
  32         * For now, we force the return value to 0 and log all traps to
  33         * see what's going on.
  34         */
  35        //gnvs->smif = 0;
  36        return 1;
  37 }