x86: ivybridge: Use common CPU init code

The existing ivybridge code predates the normal multi-core CPU init, and
it is not used. Remove it and add CPU nodes to the device tree so that all
four CPUs are set up. Also enable the 'cpu' command.

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

arch/x86/cpu/ivybridge/model_206ax.c

@@ -8,10 +8,13 @@
  */
 
 #include <common.h>
+#include <cpu.h>
+#include <dm.h>
 #include <fdtdec.h>
 #include <malloc.h>
 #include <asm/acpi.h>
 #include <asm/cpu.h>
+#include <asm/cpu_x86.h>
 #include <asm/lapic.h>
 #include <asm/msr.h>
 #include <asm/mtrr.h>
@@ -400,55 +403,6 @@ static void configure_mca(void)
 static unsigned ehci_debug_addr;
 #endif
 
-/*
- * Initialize any extra cores/threads in this package.
- */
-static int intel_cores_init(struct x86_cpu_priv *cpu)
-{
-	struct cpuid_result result;
-	unsigned threads_per_package, threads_per_core, i;
-
-	/* Logical processors (threads) per core */
-	result = cpuid_ext(0xb, 0);
-	threads_per_core = result.ebx & 0xffff;
-
-	/* Logical processors (threads) per package */
-	result = cpuid_ext(0xb, 1);
-	threads_per_package = result.ebx & 0xffff;
-
-	debug("CPU: %u has %u cores, %u threads per core\n",
-	      cpu->apic_id, threads_per_package / threads_per_core,
-	      threads_per_core);
-
-	for (i = 1; i < threads_per_package; ++i) {
-		struct x86_cpu_priv *new_cpu;
-
-		new_cpu = calloc(1, sizeof(*new_cpu));
-		if (!new_cpu)
-			return -ENOMEM;
-
-		new_cpu->apic_id = cpu->apic_id + i;
-
-		/* Update APIC ID if no hyperthreading */
-		if (threads_per_core == 1)
-			new_cpu->apic_id <<= 1;
-
-		debug("CPU: %u has core %u\n", cpu->apic_id, new_cpu->apic_id);
-
-#if 0 && CONFIG_SMP && CONFIG_MAX_CPUS > 1
-		/* TODO(sjg@chromium.org): Start the new cpu */
-		if (!start_cpu(new_cpu)) {
-			/* Record the error in cpu? */
-			printk(BIOS_ERR, "CPU %u would not start!\n",
-			       new_cpu->apic_id);
-			new_cpu->start_err = 1;
-		}
-#endif
-	}
-
-	return 0;
-}
-
 int model_206ax_init(struct x86_cpu_priv *cpu)
 {
 	int ret;
@@ -492,8 +446,10 @@ int model_206ax_init(struct x86_cpu_priv *cpu)
 
 	/* Thermal throttle activation offset */
 	ret = configure_thermal_target();
-	if (ret)
+	if (ret) {
+		debug("Cannot set thermal target\n");
 		return ret;
+	}
 
 	/* Enable Direct Cache Access */
 	configure_dca_cap();
@@ -507,8 +463,42 @@ int model_206ax_init(struct x86_cpu_priv *cpu)
 	/* Enable Turbo */
 	turbo_enable();
 
-	/* Start up extra cores */
-	intel_cores_init(cpu);
+	return 0;
+}
+
+static int model_206ax_get_info(struct udevice *dev, struct cpu_info *info)
+{
+	info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU;
+
+	return 0;
+}
+
+static int model_206ax_get_count(struct udevice *dev)
+{
+	return 4;
+}
 
+static int cpu_x86_model_206ax_probe(struct udevice *dev)
+{
 	return 0;
 }
+
+static const struct cpu_ops cpu_x86_model_206ax_ops = {
+	.get_desc	= cpu_x86_get_desc,
+	.get_info	= model_206ax_get_info,
+	.get_count	= model_206ax_get_count,
+};
+
+static const struct udevice_id cpu_x86_model_206ax_ids[] = {
+	{ .compatible = "intel,core-gen3" },
+	{ }
+};
+
+U_BOOT_DRIVER(cpu_x86_model_206ax_drv) = {
+	.name		= "cpu_x86_model_206ax",
+	.id		= UCLASS_CPU,
+	.of_match	= cpu_x86_model_206ax_ids,
+	.bind		= cpu_x86_bind,
+	.probe		= cpu_x86_model_206ax_probe,
+	.ops		= &cpu_x86_model_206ax_ops,
+};

arch/x86/dts/chromebook_link.dts

@@ -18,6 +18,40 @@
 	       silent_console = <0>;
 	};
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "intel,core-gen3";
+			reg = <0>;
+			intel,apic-id = <0>;
+		};
+
+		cpu@1 {
+			device_type = "cpu";
+			compatible = "intel,core-gen3";
+			reg = <1>;
+			intel,apic-id = <1>;
+		};
+
+		cpu@2 {
+			device_type = "cpu";
+			compatible = "intel,core-gen3";
+			reg = <2>;
+			intel,apic-id = <2>;
+		};
+
+		cpu@3 {
+			device_type = "cpu";
+			compatible = "intel,core-gen3";
+			reg = <3>;
+			intel,apic-id = <3>;
+		};
+
+	};
+
 	gpioa {
 		compatible = "intel,ich6-gpio";
 		u-boot,dm-pre-reloc;

configs/chromebook_link_defconfig

@@ -5,7 +5,9 @@ CONFIG_DEFAULT_DEVICE_TREE="chromebook_link"
 CONFIG_TARGET_CHROMEBOOK_LINK=y
 CONFIG_HAVE_MRC=y
 CONFIG_ENABLE_MRC_CACHE=y
+CONFIG_SMP=y
 CONFIG_HAVE_VGA_BIOS=y
+CONFIG_CMD_CPU=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y
@@ -17,6 +19,7 @@ CONFIG_CMD_BOOTSTAGE=y
 CONFIG_CMD_TPM=y
 CONFIG_CMD_TPM_TEST=y
 CONFIG_OF_CONTROL=y
+CONFIG_CPU=y
 CONFIG_CMD_CROS_EC=y
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_LPC=y