From f004f66ca7b0c428c04d6025738319187cf911fe Mon Sep 17 00:00:00 2001 From: Subrata Banik Date: Fri, 3 Feb 2017 19:05:27 +0530 Subject: soc/intel/skylake: Enable ACPI PM timer emulation on all CPUs This patch enables ACPI timer emulation on all the logical cpus. BUG=chrome-os-partner:62438 BRANCH=NONE TEST=Verify MSR 0x121 gets programmed on all logical cpus during coreboot MP Init. Change-Id: I2246cdfe1f60fd359b0a0eda89b4a45b5554dc4a Signed-off-by: Subrata Banik Reviewed-on: https://review.coreboot.org/18288 Reviewed-by: Aaron Durbin Tested-by: build bot (Jenkins) --- src/soc/intel/skylake/cpu.c | 29 ++++++++++++++++++++++++++--- 1 file changed, 26 insertions(+), 3 deletions(-) (limited to 'src/soc/intel/skylake/cpu.c') diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c index 7cf4a75575..10b42dc992 100644 --- a/src/soc/intel/skylake/cpu.c +++ b/src/soc/intel/skylake/cpu.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include #include @@ -371,6 +372,27 @@ static void configure_c_states(void) wrmsr(MSR_C_STATE_LATENCY_CONTROL_5, msr); } +/* + * The emulated ACPI timer allows disabling of the ACPI timer + * (PM1_TMR) to have no impart on the system. + */ +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_TMR, msr); +} + /* All CPUs including BSP will run the following function. */ static void cpu_core_init(device_t cpu) { @@ -390,6 +412,9 @@ static void cpu_core_init(device_t cpu) /* Configure Intel Speed Shift */ configure_isst(); + /* Enable ACPI Timer Emulation via MSR 0x121 */ + enable_pm_timer_emulation(); + /* Enable Direct Cache Access */ configure_dca_cap(); @@ -570,8 +595,6 @@ int soc_skip_ucode_update(u32 current_patch_id, u32 new_patch_id) (current_patch_id == new_patch_id - 1); } -/* - * Do CPU MP Init before FSP Silicon Init - */ +/* Do CPU MP Init before FSP Silicon Init */ BOOT_STATE_INIT_ENTRY(BS_DEV_INIT_CHIPS, BS_ON_ENTRY, soc_init_cpus, NULL); BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_EXIT, soc_post_cpus_init, NULL); -- cgit v1.2.3