diff options
Diffstat (limited to 'arch/x86/cpu/apollolake/cpu_common.c')
| -rw-r--r-- | arch/x86/cpu/apollolake/cpu_common.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/cpu/apollolake/cpu_common.c b/arch/x86/cpu/apollolake/cpu_common.c index ba6bda3..63f6999 100644 --- a/arch/x86/cpu/apollolake/cpu_common.c +++ b/arch/x86/cpu/apollolake/cpu_common.c @@ -4,8 +4,13 @@ */ #include <common.h> +#include <dm.h> +#include <log.h> #include <asm/cpu_common.h> #include <asm/msr.h> +#include <asm/arch/cpu.h> +#include <asm/arch/iomap.h> +#include <power/acpi_pmc.h> void cpu_flush_l1d_to_l2(void) { @@ -15,3 +20,23 @@ void cpu_flush_l1d_to_l2(void) msr.lo |= FLUSH_DL1_L2; msr_write(MSR_POWER_MISC, msr); } + +void enable_pm_timer_emulation(const struct udevice *pmc) +{ + struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(pmc); + 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 | (upriv->acpi_base + R_ACPI_PM1_TMR); + debug("PM timer %x %x\n", msr.hi, msr.lo); + msr_write(MSR_EMULATE_PM_TIMER, msr); +} |