soc/intel/broadwell/cpu.c: Re-add `configure_thermal_target`

Commit 360684b (soc/intel/common: add TCC activation functionality) made
Broadwell use common SoC code. However, this makes Broadwell depend on
SoC code, which prevents splitting Broadwell into CPU, northbridge and
southbridge, a stepping stone before merging with Haswell and Lynxpoint.

Tested on out-of-tree Acer E5-573, still boots.

Change-Id: Ib7ab4e75bd4416dde4612e67405a871da569008a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46731
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/broadwell/cpu.c

@@ -290,6 +290,28 @@ static void configure_c_states(void)
 	wrmsr(MSR_C_STATE_LATENCY_CONTROL_5, msr);
 }
 
+static void configure_thermal_target(void)
+{
+	config_t *conf;
+	struct device *lapic;
+	msr_t msr;
+
+	/* Find pointer to CPU configuration */
+	lapic = dev_find_lapic(SPEEDSTEP_APIC_MAGIC);
+	if (!lapic || !lapic->chip_info)
+		return;
+	conf = lapic->chip_info;
+
+	/* Set TCC activation offset if supported */
+	msr = rdmsr(MSR_PLATFORM_INFO);
+	if ((msr.lo & (1 << 30)) && conf->tcc_offset) {
+		msr = rdmsr(MSR_TEMPERATURE_TARGET);
+		msr.lo &= ~(0xf << 24); /* Bits 27:24 */
+		msr.lo |= (conf->tcc_offset & 0xf) << 24;
+		wrmsr(MSR_TEMPERATURE_TARGET, msr);
+	}
+}
+
 static void configure_misc(void)
 {
 	msr_t msr;
@@ -372,7 +394,7 @@ static void cpu_core_init(struct device *cpu)
 	configure_misc();
 
 	/* Thermal throttle activation offset */
-	configure_tcc_thermal_target();
+	configure_thermal_target();
 
 	/* Enable Direct Cache Access */
 	configure_dca_cap();