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>
diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c
index 7d0ed73..1898903 100644
--- a/arch/x86/cpu/intel_common/cpu.c
+++ b/arch/x86/cpu/intel_common/cpu.c
@@ -145,3 +145,23 @@
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;
+}