[082/108] x86: Add a few common Intel CPU functions

Message ID 20200126220508.82.I9e5c6c23522c6d47c569dccf41bfa7b48aeb554b@changeid
State New
Headers show
Series
  • RFC: dm: Add programatic generation of ACPI tables
Related show

Commit Message

Simon Glass Jan. 27, 2020, 5:06 a.m.
Add functions to query CPU information, needed for ACPI.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/x86/cpu/intel_common/cpu.c   | 59 +++++++++++++++++++++++++++++++
 arch/x86/include/asm/cpu_common.h | 31 ++++++++++++++++
 2 files changed, 90 insertions(+)

Patch

diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c
index 4d093a5391..106ff41e23 100644
--- a/arch/x86/cpu/intel_common/cpu.c
+++ b/arch/x86/cpu/intel_common/cpu.c
@@ -8,6 +8,7 @@ 
  */
 
 #include <common.h>
+#include <acpigen.h>
 #include <cpu.h>
 #include <dm.h>
 #include <errno.h>
@@ -226,3 +227,61 @@  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;
+}
+
+uint32_t 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 */
+}
+
+uint32_t 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;
+}
+
+uint32_t cpu_get_bus_clock(void)
+{
+	/* CPU bus clock is set by default here to 100MHz.
+	 * This function returns the bus clock in KHz.
+	 */
+	return INTEL_BCLK_MHZ * 1000;
+}
+
+uint32_t cpu_get_power_max(void)
+{
+	msr_t msr;
+	int power_unit;
+
+	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;
+}
+
+uint32_t 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 cdd99a90b7..c3f699ffd3 100644
--- a/arch/x86/include/asm/cpu_common.h
+++ b/arch/x86/include/asm/cpu_common.h
@@ -128,4 +128,35 @@  void cpu_set_eist(bool eist_status);
  */
 void cpu_set_p_state_to_turbo_ratio(void);
 
+/*
+ * cpu_get_bus_clock returns the bus clock frequency in KHz.
+ * This is the value the clock ratio is multiplied with.
+ */
+uint32_t cpu_get_bus_clock(void);
+
+int cpu_get_coord_type(void);
+
+/*
+ * cpu_get_min_ratio returns the minimum frequency ratio that is supported
+ * by this processor
+ */
+uint32_t cpu_get_min_ratio(void);
+
+/*
+ * cpu_get_max_ratio returns the nominal TDP ratio if available or the
+ * maximum non turbo frequency ratio for this processor
+ */
+uint32_t cpu_get_max_ratio(void);
+
+/*
+ * cpu_get_power_max calculates CPU TDP in mW
+ */
+uint32_t cpu_get_power_max(void);
+
+/*
+ * cpu_get_max_turbo_ratio returns the maximum turbo ratio limit for the
+ * processor
+ */
+uint32_t cpu_get_max_turbo_ratio(void);
+
 #endif