x86: Add common functions for TDP and perf control

These functions are the same on modern Intel CPUs, so use common code to
set them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: return false instead of 0 in cpu_ivybridge_config_tdp_levels();
        fix 'muiltiplier' and 'desgn' typos]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/broadwell/cpu.c

@@ -41,12 +41,9 @@ int arch_cpu_init_dm(void)
 
 void set_max_freq(void)
 {
-	msr_t msr, perf_ctl, platform_info;
+	msr_t msr, perf_ctl;
 
-	/* Check for configurable TDP option */
-	platform_info = msr_read(MSR_PLATFORM_INFO);
-
-	if ((platform_info.hi >> 1) & 3) {
+	if (cpu_config_tdp_levels()) {
 		/* Set to nominal TDP ratio */
 		msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
 		perf_ctl.lo = (msr.lo & 0xff) << 8;

arch/x86/cpu/broadwell/cpu_full.c

@@ -329,15 +329,6 @@ static int bsp_init_before_ap_bringup(struct udevice *dev)
 	return 0;
 }
 
-static int cpu_config_tdp_levels(void)
-{
-	msr_t platform_info;
-
-	/* Bits 34:33 indicate how many levels supported */
-	platform_info = msr_read(MSR_PLATFORM_INFO);
-	return (platform_info.hi >> 1) & 3;
-}
-
 static void set_max_ratio(void)
 {
 	msr_t msr, perf_ctl;

arch/x86/cpu/intel_common/cpu.c

@@ -145,3 +145,23 @@ int cpu_configure_thermal_target(struct udevice *dev)
 
 	return 0;
 }
+
+void cpu_set_perf_control(uint clk_ratio)
+{
+	msr_t perf_ctl;
+
+	perf_ctl.lo = (clk_ratio & 0xff) << 8;
+	perf_ctl.hi = 0;
+	msr_write(MSR_IA32_PERF_CTL, perf_ctl);
+	debug("CPU: frequency set to %d MHz\n", clk_ratio * INTEL_BCLK_MHZ);
+}
+
+bool cpu_config_tdp_levels(void)
+{
+	msr_t platform_info;
+
+	/* Bits 34:33 indicate how many levels supported */
+	platform_info = msr_read(MSR_PLATFORM_INFO);
+
+	return ((platform_info.hi >> 1) & 3) != 0;
+}

arch/x86/cpu/ivybridge/model_206ax.c

@@ -140,19 +140,16 @@ static const u8 power_limit_time_msr_to_sec[] = {
 	[0x11] = 128,
 };
 
-int cpu_config_tdp_levels(void)
+bool cpu_ivybridge_config_tdp_levels(void)
 {
 	struct cpuid_result result;
-	msr_t platform_info;
 
 	/* Minimum CPU revision */
 	result = cpuid(1);
 	if (result.eax < IVB_CONFIG_TDP_MIN_CPUID)
-		return 0;
+		return false;
 
-	/* Bits 34:33 indicate how many levels supported */
-	platform_info = msr_read(MSR_PLATFORM_INFO);
-	return (platform_info.hi >> 1) & 3;
+	return cpu_config_tdp_levels();
 }
 
 /*
@@ -213,7 +210,7 @@ void set_power_limits(u8 power_limit_1_time)
 	msr_write(MSR_PKG_POWER_LIMIT, limit);
 
 	/* Use nominal TDP values for CPUs with configurable TDP */
-	if (cpu_config_tdp_levels()) {
+	if (cpu_ivybridge_config_tdp_levels()) {
 		msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
 		limit.hi = 0;
 		limit.lo = msr.lo & 0xff;
@@ -329,24 +326,20 @@ static void configure_dca_cap(void)
 
 static void set_max_ratio(void)
 {
-	msr_t msr, perf_ctl;
-
-	perf_ctl.hi = 0;
+	msr_t msr;
+	uint ratio;
 
 	/* Check for configurable TDP option */
-	if (cpu_config_tdp_levels()) {
+	if (cpu_ivybridge_config_tdp_levels()) {
 		/* Set to nominal TDP ratio */
 		msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
-		perf_ctl.lo = (msr.lo & 0xff) << 8;
+		ratio = msr.lo & 0xff;
 	} else {
 		/* Platform Info bits 15:8 give max ratio */
 		msr = msr_read(MSR_PLATFORM_INFO);
-		perf_ctl.lo = msr.lo & 0xff00;
+		ratio = (msr.lo & 0xff00) >> 8;
 	}
-	msr_write(MSR_IA32_PERF_CTL, perf_ctl);
-
-	debug("model_x06ax: frequency set to %d\n",
-	      ((perf_ctl.lo >> 8) & 0xff) * INTEL_BCLK_MHZ);
+	cpu_set_perf_control(ratio);
 }
 
 static void set_energy_perf_bias(u8 policy)

arch/x86/cpu/ivybridge/northbridge.c

@@ -141,7 +141,7 @@ static void northbridge_init(struct udevice *dev, int rev)
 	 * CPUs with configurable TDP also need power limits set
 	 * in MCHBAR.  Use same values from MSR_PKG_POWER_LIMIT.
 	 */
-	if (cpu_config_tdp_levels()) {
+	if (cpu_ivybridge_config_tdp_levels()) {
 		msr_t msr = msr_read(MSR_PKG_POWER_LIMIT);
 
 		writel(msr.lo, MCHBAR_REG(0x59A0));

arch/x86/include/asm/arch-ivybridge/model_206ax.h

@@ -58,6 +58,6 @@
 
 /* Configure power limits for turbo mode */
 void set_power_limits(u8 power_limit_1_time);
-int cpu_config_tdp_levels(void);
+bool cpu_ivybridge_config_tdp_levels(void);
 
 #endif

arch/x86/include/asm/cpu_common.h

@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
+ * Common code for Intel CPUs
+ *
  * Copyright (c) 2016 Google, Inc
  */
 
@@ -61,4 +63,20 @@ int cpu_intel_get_info(struct cpu_info *info, int bclk_mz);
  */
 int cpu_configure_thermal_target(struct udevice *dev);
 
+/**
+ * cpu_set_perf_control() - Set the nominal CPU clock speed
+ *
+ * This sets the clock speed as a multiplier of BCLK
+ *
+ * @clk_ratio: Ratio to use
+ */
+void cpu_set_perf_control(uint clk_ratio);
+
+/**
+ * cpu_config_tdp_levels() - Check for configurable TDP option
+ *
+ * @return true if the CPU has configurable TDP (Thermal-design power)
+ */
+bool cpu_config_tdp_levels(void);
+
 #endif