x86: Move common CPU code to its own place

Some of the Intel CPU code is common to several Intel CPUs. Move it into a
common location along with required declarations.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 112 insertions, 0 deletions

diff --git a/arch/x86/cpu/intel_common/Makefile b/arch/x86/cpu/intel_common/Makefile
index 74b005a..06de964 100644
--- a/arch/x86/cpu/intel_common/Makefile
+++ b/arch/x86/cpu/intel_common/Makefile
@@ -5,6 +5,7 @@
 #
 
 obj-$(CONFIG_HAVE_MRC) += car.o
+obj-y += cpu.o
 obj-y += lpc.o
 ifndef CONFIG_TARGET_EFI
 obj-y += microcode.o
diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c
new file mode 100644
index 0000000..1210943
--- /dev/null
+++ b/arch/x86/cpu/intel_common/cpu.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/cpu_common.h>
+#include <asm/intel_regs.h>
+#include <asm/lapic.h>
+#include <asm/lpc_common.h>
+#include <asm/msr.h>
+#include <asm/mtrr.h>
+#include <asm/post.h>
+#include <asm/microcode.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int report_bist_failure(void)
+{
+	if (gd->arch.bist != 0) {
+		post_code(POST_BIST_FAILURE);
+		printf("BIST failed: %08x\n", gd->arch.bist);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+int cpu_common_init(void)
+{
+	struct udevice *dev, *lpc;
+	int ret;
+
+	/* Halt if there was a built in self test failure */
+	ret = report_bist_failure();
+	if (ret)
+		return ret;
+
+	enable_lapic();
+
+	ret = microcode_update_intel();
+	if (ret && ret != -EEXIST)
+		return ret;
+
+	/* Enable upper 128bytes of CMOS */
+	writel(1 << 2, RCB_REG(RC));
+
+	/* Early chipset init required before RAM init can work */
+	uclass_first_device(UCLASS_NORTHBRIDGE, &dev);
+
+	ret = uclass_first_device(UCLASS_LPC, &lpc);
+	if (ret)
+		return ret;
+	if (!lpc)
+		return -ENODEV;
+
+	/* Cause the SATA device to do its early init */
+	uclass_first_device(UCLASS_DISK, &dev);
+
+	return 0;
+}
+
+int cpu_set_flex_ratio_to_tdp_nominal(void)
+{
+	msr_t flex_ratio, msr;
+	u8 nominal_ratio;
+
+	/* Check for Flex Ratio support */
+	flex_ratio = msr_read(MSR_FLEX_RATIO);
+	if (!(flex_ratio.lo & FLEX_RATIO_EN))
+		return -EINVAL;
+
+	/* Check for >0 configurable TDPs */
+	msr = msr_read(MSR_PLATFORM_INFO);
+	if (((msr.hi >> 1) & 3) == 0)
+		return -EINVAL;
+
+	/* Use nominal TDP ratio for flex ratio */
+	msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
+	nominal_ratio = msr.lo & 0xff;
+
+	/* See if flex ratio is already set to nominal TDP ratio */
+	if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio)
+		return 0;
+
+	/* Set flex ratio to nominal TDP ratio */
+	flex_ratio.lo &= ~0xff00;
+	flex_ratio.lo |= nominal_ratio << 8;
+	flex_ratio.lo |= FLEX_RATIO_LOCK;
+	msr_write(MSR_FLEX_RATIO, flex_ratio);
+
+	/* Set flex ratio in soft reset data register bits 11:6 */
+	clrsetbits_le32(RCB_REG(SOFT_RESET_DATA), 0x3f << 6,
+			(nominal_ratio & 0x3f) << 6);
+
+	debug("CPU: Soft reset to set up flex ratio\n");
+
+	/* Set soft reset control to use register value */
+	setbits_le32(RCB_REG(SOFT_RESET_CTRL), 1);
+
+	/* Issue warm reset, will be "CPU only" due to soft reset data */
+	outb(0x0, PORT_RESET);
+	outb(SYS_RST | RST_CPU, PORT_RESET);
+	cpu_hlt();
+
+	/* Not reached */
+	return -EINVAL;
+}