diff options
| author | Aamir Bohra <aamir.bohra@intel.com> | 2018-03-28 11:32:58 +0530 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-07-30 18:49:15 +0000 |
| commit | 2276d4f4a858da4a1cccc7cd8d870f0ac114efed (patch) | |
| tree | bc96f520ceb72e6aba761a3515da58a0f9c752a8 /src/soc/intel/common/block/rtc/rtc.c | |
| parent | 4f9ff53e4239426d06c5a55a9e04b0e9a3e801cc (diff) | |
soc/intel/common: Add support to configure top swap feature
RTC BUC control register provides a software interface to
configure the top swap feature. This patch adds implementation
to enable/disable top swap feature and gets it accessible in
romstage as well.
The top swap control functions are exposed only if INTEL_HAS_TOP_SWAP
is selected.
To use the topswap feature a second bootblock has to be added
to the cbfs. Below configs aid in doing that,
INTEL_HAS_TOP_SWAP
INTEL_ADD_TOP_SWAP_BOOTBLOCK
INTEL_TOP_SWAP_BOOTBLOCK_SIZE
Enabling and Disabling topswap, using the added API enables user
to boot alternatively from either bootblock.
Change-Id: Iea31b891f81e76d4d623fcb68183c3ad3dcadbad
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Reviewed-on: https://review.coreboot.org/25805
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/intel/common/block/rtc/rtc.c')
| -rw-r--r-- | src/soc/intel/common/block/rtc/rtc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/rtc/rtc.c b/src/soc/intel/common/block/rtc/rtc.c index cb97953557..b8c8849d10 100644 --- a/src/soc/intel/common/block/rtc/rtc.c +++ b/src/soc/intel/common/block/rtc/rtc.c @@ -25,6 +25,9 @@ #define PCR_RTC_CONF_LCMOS_LOCK (1 << 3) #define PCR_RTC_CONF_UCMOS_LOCK (1 << 4) #define PCR_RTC_CONF_RESERVED (1 << 31) +/* RTC backed up control register */ +#define PCR_RTC_BUC 0x3414 +#define PCR_RTC_BUC_TOP_SWAP (1 << 0) void enable_rtc_upper_bank(void) { @@ -44,3 +47,18 @@ void rtc_init(void) cmos_init(soc_get_rtc_failed()); } + +#if IS_ENABLED(CONFIG_INTEL_HAS_TOP_SWAP) +void configure_rtc_buc_top_swap(enum ts_config ts_state) +{ + pcr_rmw32(PID_RTC, PCR_RTC_BUC, ~PCR_RTC_BUC_TOP_SWAP, ts_state); +} + +enum ts_config get_rtc_buc_top_swap_status(void) +{ + if (pcr_read32(PID_RTC, PCR_RTC_BUC) & PCR_RTC_BUC_TOP_SWAP) + return TS_ENABLE; + else + return TS_DISABLE; +} +#endif |