diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/intel/icelake/cpu.c | 21 | ||||
| -rw-r--r-- | src/soc/intel/icelake/include/soc/cpu.h | 3 |
2 files changed, 24 insertions, 0 deletions
diff --git a/src/soc/intel/icelake/cpu.c b/src/soc/intel/icelake/cpu.c index 0585450214..f4ebacf962 100644 --- a/src/soc/intel/icelake/cpu.c +++ b/src/soc/intel/icelake/cpu.c @@ -24,6 +24,7 @@ #include <fsp/api.h> #include <intelblocks/cpulib.h> #include <intelblocks/mp_init.h> +#include <intelblocks/msr.h> #include <intelblocks/smm.h> #include <romstage_handoff.h> #include <soc/cpu.h> @@ -118,6 +119,23 @@ static void configure_dca_cap(void) } } +static void enable_pm_timer_emulation(void) +{ + /* ACPI PM timer emulation */ + msr_t msr; + /* + * The derived frequency is calculated as follows: + * (CTC_FREQ * msr[63:32]) >> 32 = target frequency. + * Back solve the multiplier so the 3.579545MHz ACPI timer + * frequency is used. + */ + msr.hi = (3579545ULL << 32) / CTC_FREQ; + /* Set PM1 timer IO port and enable*/ + msr.lo = (EMULATE_DELAY_VALUE << EMULATE_DELAY_OFFSET_VALUE) | + EMULATE_PM_TMR_EN | (ACPI_BASE_ADDRESS + PM1_TMR); + wrmsr(MSR_EMULATE_PM_TIMER, msr); +} + static void set_energy_perf_bias(u8 policy) { msr_t msr; @@ -190,6 +208,9 @@ void soc_core_init(struct device *cpu) /* Configure Intel Speed Shift */ configure_isst(); + /* Enable PM timer emulation */ + enable_pm_timer_emulation(); + /* Enable Direct Cache Access */ configure_dca_cap(); diff --git a/src/soc/intel/icelake/include/soc/cpu.h b/src/soc/intel/icelake/include/soc/cpu.h index 1e8d9e86c4..b5722da742 100644 --- a/src/soc/intel/icelake/include/soc/cpu.h +++ b/src/soc/intel/icelake/include/soc/cpu.h @@ -35,6 +35,9 @@ #define C9_POWER 0xc8 #define C10_POWER 0xc8 +/* Common Timer Copy (CTC) frequency - 38.4MHz. */ +#define CTC_FREQ 38400000 + #define C_STATE_LATENCY_MICRO_SECONDS(limit, base) \ (((1 << ((base)*5)) * (limit)) / 1000) #define C_STATE_LATENCY_FROM_LAT_REG(reg) \ |