x86: apl: Add a CPU driver

Add a bare-bones CPU driver so that CPUs can be probed.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/apollolake/Makefile

@@ -4,8 +4,10 @@
 
 obj-$(CONFIG_SPL_BUILD) += spl.o
 obj-$(CONFIG_SPL_BUILD) += systemagent.o
+obj-y += cpu_common.o
 
 ifndef CONFIG_TPL_BUILD
+obj-y += cpu.o
 obj-y += punit.o
 endif
 

arch/x86/cpu/apollolake/cpu.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <asm/cpu_common.h>
+#include <asm/cpu_x86.h>
+
+static int apl_get_info(struct udevice *dev, struct cpu_info *info)
+{
+	return cpu_intel_get_info(info, INTEL_BCLK_MHZ);
+}
+
+static int apl_get_count(struct udevice *dev)
+{
+	return 4;
+}
+
+static const struct cpu_ops cpu_x86_apl_ops = {
+	.get_desc	= cpu_x86_get_desc,
+	.get_info	= apl_get_info,
+	.get_count	= apl_get_count,
+	.get_vendor	= cpu_x86_get_vendor,
+};
+
+static const struct udevice_id cpu_x86_apl_ids[] = {
+	{ .compatible = "intel,apl-cpu" },
+	{ }
+};
+
+U_BOOT_DRIVER(cpu_x86_apl_drv) = {
+	.name		= "cpu_x86_apl",
+	.id		= UCLASS_CPU,
+	.of_match	= cpu_x86_apl_ids,
+	.bind		= cpu_x86_bind,
+	.ops		= &cpu_x86_apl_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
+};

arch/x86/cpu/apollolake/cpu_common.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <asm/cpu_common.h>
+#include <asm/msr.h>
+
+void cpu_flush_l1d_to_l2(void)
+{
+	struct msr_t msr;
+
+	msr = msr_read(MSR_POWER_MISC);
+	msr.lo |= FLUSH_DL1_L2;
+	msr_write(MSR_POWER_MISC, msr);
+}

arch/x86/include/asm/arch-apollolake/cpu.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#ifndef _ASM_ARCH_CPU_H
+#define _ASM_ARCH_CPU_H
+
+/* Common Timer Copy (CTC) frequency - 19.2MHz */
+#define CTC_FREQ		19200000
+
+#define MAX_PCIE_PORTS		6
+#define CLKREQ_DISABLED		0xf
+
+#ifndef __ASSEMBLY__
+/* Flush L1D to L2 */
+void cpu_flush_l1d_to_l2(void);
+#endif
+
+#endif /* _ASM_ARCH_CPU_H */

arch/x86/include/asm/msr-index.h

@@ -70,6 +70,7 @@
 #define MSR_IA32_BBL_CR_CTL		0x00000119
 #define MSR_IA32_BBL_CR_CTL3		0x0000011e
 #define MSR_POWER_MISC			0x00000120
+#define  FLUSH_DL1_L2			(1 << 8)
 #define ENABLE_ULFM_AUTOCM_MASK		(1 << 2)
 #define ENABLE_INDP_AUTOCM_MASK		(1 << 3)