diff options
Diffstat (limited to 'src/soc/intel/apollolake/pmutil.c')
| -rw-r--r-- | src/soc/intel/apollolake/pmutil.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/pmutil.c b/src/soc/intel/apollolake/pmutil.c index c88e5ae8bf..12a1051246 100644 --- a/src/soc/intel/apollolake/pmutil.c +++ b/src/soc/intel/apollolake/pmutil.c @@ -21,10 +21,12 @@ #include <arch/io.h> #include <console/console.h> #include <cbmem.h> +#include <cpu/x86/msr.h> #include <rules.h> #include <device/pci_def.h> #include <halt.h> #include <soc/iomap.h> +#include <soc/cpu.h> #include <soc/pci_devs.h> #include <soc/pm.h> #include <device/device.h> @@ -551,3 +553,19 @@ void pmc_gpe_init(void) /* Set the routes in the GPIO communities as well. */ gpio_route_gpe(dw1, dw2, dw3); } + +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_PM_TMR_EN | (ACPI_PMIO_BASE + R_ACPI_PM1_TMR); + wrmsr(MSR_EMULATE_PM_TMR, msr); +} |