Add functions to query CPU information, needed for ACPI.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v1)
Changes in v1: - Add more comments and rename cpu_get_bus_clock to cpu_get_bus_clock_khz()
arch/x86/cpu/intel_common/cpu.c | 64 +++++++++++++++++++++++++++++++ arch/x86/include/asm/cpu_common.h | 49 +++++++++++++++++++++++ include/acpi/acpigen.h | 12 ++++++ 3 files changed, 125 insertions(+)
diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c index 509730aea96..cb4ef84013a 100644 --- a/arch/x86/cpu/intel_common/cpu.c +++ b/arch/x86/cpu/intel_common/cpu.c @@ -12,6 +12,7 @@ #include <dm.h> #include <errno.h> #include <log.h> +#include <acpi/acpigen.h> #include <asm/cpu.h> #include <asm/cpu_common.h> #include <asm/intel_regs.h> @@ -227,3 +228,66 @@ void cpu_set_eist(bool eist_status) msr.lo &= ~MISC_ENABLE_ENHANCED_SPEEDSTEP; msr_write(MSR_IA32_MISC_ENABLE, msr); } + +int cpu_get_coord_type(void) +{ + return HW_ALL; +} + +int cpu_get_min_ratio(void) +{ + msr_t msr; + + /* Get bus ratio limits and calculate clock speeds */ + msr = msr_read(MSR_PLATFORM_INFO); + + return (msr.hi >> 8) & 0xff; /* Max Efficiency Ratio */ +} + +int cpu_get_max_ratio(void) +{ + u32 ratio_max; + msr_t msr; + + if (cpu_config_tdp_levels()) { + /* Set max ratio to nominal TDP ratio */ + msr = msr_read(MSR_CONFIG_TDP_NOMINAL); + ratio_max = msr.lo & 0xff; + } else { + msr = msr_read(MSR_PLATFORM_INFO); + /* Max Non-Turbo Ratio */ + ratio_max = (msr.lo >> 8) & 0xff; + } + + return ratio_max; +} + +int cpu_get_bus_clock_khz(void) +{ + /* + * CPU bus clock is set by default here to 100MHz. This function returns + * the bus clock in KHz. + */ + return INTEL_BCLK_MHZ * 1000; +} + +int cpu_get_power_max(void) +{ + int power_unit; + msr_t msr; + + msr = msr_read(MSR_PKG_POWER_SKU_UNIT); + power_unit = 2 << ((msr.lo & 0xf) - 1); + msr = msr_read(MSR_PKG_POWER_SKU); + + return (msr.lo & 0x7fff) * 1000 / power_unit; +} + +int cpu_get_max_turbo_ratio(void) +{ + msr_t msr; + + msr = msr_read(MSR_TURBO_RATIO_LIMIT); + + return msr.lo & 0xff; +} diff --git a/arch/x86/include/asm/cpu_common.h b/arch/x86/include/asm/cpu_common.h index cdd99a90b76..a7b7112d417 100644 --- a/arch/x86/include/asm/cpu_common.h +++ b/arch/x86/include/asm/cpu_common.h @@ -128,4 +128,53 @@ void cpu_set_eist(bool eist_status); */ void cpu_set_p_state_to_turbo_ratio(void);
+/** + * cpu_get_coord_type() - Get the type of coordination for P-State transition + * + * See ACPI spec v6.3 section 8.4.6.5 _PSD (P-State Dependency) + * + * @return HW_ALL (always) + */ +int cpu_get_coord_type(void); + +/** + * cpu_get_min_ratio() - get minimum support frequency ratio for CPU + * + * @return minimum ratio + */ +int cpu_get_min_ratio(void); + +/** + * cpu_get_max_ratio() - get nominal TDP ration or max non-turbo ratio + * + * If a nominal TDP ratio is available, it is returned. Otherwise this returns + * the maximum non-turbo frequency ratio for this processor + * + * @return max ratio + */ +int cpu_get_max_ratio(void); + +/** + * cpu_get_bus_clock_khz() - Get the bus clock frequency in KHz + * + * This is the value the clock ratio is multiplied with + * + * @return bus-block frequency in KHz + */ +int cpu_get_bus_clock_khz(void); + +/** + * cpu_get_power_max() - Get maximum CPU TDP + * + * @return maximum CPU TDP (Thermal-design power) in mW + */ +int cpu_get_power_max(void); + +/** + * cpu_get_max_turbo_ratio() - Get maximum turbo ratio + * + * @return maximum ratio + */ +int cpu_get_max_turbo_ratio(void); + #endif diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h index 34b3115bc9c..c412898169e 100644 --- a/include/acpi/acpigen.h +++ b/include/acpi/acpigen.h @@ -73,6 +73,18 @@ enum { RETURN_OP = 0xa4, };
+/** + * enum psd_coord - Coordination types for P-states + * + * The type of coordination that exists (hardware) or is required (software) as + * a result of the underlying hardware dependency + */ +enum psd_coord { + SW_ALL = 0xfc, + SW_ANY = 0xfd, + HW_ALL = 0xfe +}; + /** * acpigen_get_current() - Get the current ACPI code output pointer *