1 files changed, 32 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/cpu/romstage.c b/src/soc/intel/broadwell/cpu/romstage.c
new file mode 100644
index 0000000000..c9f70a85d1
--- /dev/null
+++ b/src/soc/intel/broadwell/cpu/romstage.c
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/cpu.h>
+#include <console/console.h>
+#include <cpu/x86/msr.h>
+#include <soc/cpu.h>
+#include <soc/msr.h>
+#include <soc/romstage.h>
+
+void set_max_freq(void)
+{
+	msr_t msr, perf_ctl, platform_info;
+
+	/* Check for configurable TDP option */
+	platform_info = rdmsr(MSR_PLATFORM_INFO);
+
+	if ((platform_info.hi >> 1) & 3) {
+		/* Set to nominal TDP ratio */
+		msr = rdmsr(MSR_CONFIG_TDP_NOMINAL);
+		perf_ctl.lo = (msr.lo & 0xff) << 8;
+	} else {
+		/* Platform Info bits 15:8 give max ratio */
+		msr = rdmsr(MSR_PLATFORM_INFO);
+		perf_ctl.lo = msr.lo & 0xff00;
+	}
+
+	perf_ctl.hi = 0;
+	wrmsr(IA32_PERF_CTL, perf_ctl);
+
+	printk(BIOS_DEBUG, "CPU: frequency set to %d MHz\n",
+	       ((perf_ctl.lo >> 8) & 0xff) * CPU_BCLK);
+}