src/soc/intel/common/block/rtc/rtc.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <intelblocks/pcr.h>
   4 #include <intelblocks/rtc.h>
   5 #include <soc/pcr_ids.h>
   6 #include <pc80/mc146818rtc.h>
   7
   8 /* RTC PCR configuration */
   9 #define PCR_RTC_CONF            0x3400
  10 #define PCR_RTC_CONF_UCMOS_EN   (1 << 2)
  11 #define PCR_RTC_CONF_LCMOS_LOCK (1 << 3)
  12 #define PCR_RTC_CONF_UCMOS_LOCK (1 << 4)
  13 #define PCR_RTC_CONF_BILD       (1 << 31)
  14 /* RTC backed up control register */
  15 #define PCR_RTC_BUC             0x3414
  16 #define  PCR_RTC_BUC_TOP_SWAP   (1 << 0)
  17
  18 void enable_rtc_upper_bank(void)
  19 {
  20         /* Enable upper 128 bytes of CMOS */
  21         pcr_or32(PID_RTC, PCR_RTC_CONF, PCR_RTC_CONF_UCMOS_EN);
  22 }
  23
  24 __weak int soc_get_rtc_failed(void)
  25 {
  26         return 0;
  27 }
  28
  29 void rtc_init(void)
  30 {
  31         /* Ensure the date is set including century byte. */
  32         cmos_check_update_date();
  33
  34         cmos_init(soc_get_rtc_failed());
  35 }
  36
  37 void rtc_conf_set_bios_interface_lockdown(void)
  38 {
  39         pcr_rmw32(PID_RTC, PCR_RTC_CONF, ~PCR_RTC_CONF_BILD,
  40                                         PCR_RTC_CONF_BILD);
  41 }
  42
  43 #if CONFIG(INTEL_HAS_TOP_SWAP)
  44 void configure_rtc_buc_top_swap(enum ts_config ts_state)
  45 {
  46         pcr_rmw32(PID_RTC, PCR_RTC_BUC, ~PCR_RTC_BUC_TOP_SWAP, ts_state);
  47 }
  48
  49 enum ts_config get_rtc_buc_top_swap_status(void)
  50 {
  51         if (pcr_read32(PID_RTC, PCR_RTC_BUC) & PCR_RTC_BUC_TOP_SWAP)
  52                 return TS_ENABLE;
  53         else
  54                 return TS_DISABLE;
  55 }
  56 #endif