src/soc/mediatek/mt8173/timer.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2015 MediaTek Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <arch/io.h>
  17 #include <soc/mcucfg.h>
  18 #include <soc/timer.h>
  19
  20 void timer_prepare(void)
  21 {
  22         /* Set XGPT_IDX to 0, then the bit field of XGPT_CTL will be programmed
  23          * with following definition.
  24          *
  25          * [10: 8] Clock mode
  26          *         100: 26Mhz / 4
  27          *         010: 26Mhz / 2
  28          *         001: 26Mhz
  29          * [ 1: 1] Halt-on-debug enable bit
  30          * [ 0: 0] XGPT enable bit
  31          */
  32         write32(&mt8173_mcucfg->xgpt_idx, 0);
  33         /* Set clock mode to 13Mhz and enable XGPT */
  34         write32(&mt8173_mcucfg->xgpt_ctl, (0x1 | ((26 / GPT4_MHZ) << 8)));
  35 }