cpu: Add support for microcode version and CPU ID

Some CPUs use microcode and each core can have a different version of
microcode loaded. Also some CPUs support the concept of an integer ID used
for identification purposes. Add support for these in the CPU uclass.

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

2 files changed, 12 insertions, 0 deletions

diff --git a/cmd/cpu.c b/cmd/cpu.c
index b4af64f54f..bc4dc5c529 100644
--- a/cmd/cpu.c
+++ b/cmd/cpu.c
@@ -14,6 +14,7 @@
 static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
 	"L1 cache",
 	"MMU",
+	"Microcode",
 };
 
 static int print_cpu_list(bool detail)
@@ -58,6 +59,12 @@ static int print_cpu_list(bool detail)
 			}
 		}
 		printf("\n");
+		if (info.features & (1 << CPU_FEAT_UCODE)) {
+			printf("\tMicrocode version %#x\n",
+			       plat->ucode_version);
+		}
+		if (info.features & (1 << CPU_FEAT_DEVICE_ID))
+			printf("\tDevice ID %#lx\n", plat->device_id);
 	}
 
 	return 0;
diff --git a/include/cpu.h b/include/cpu.h
index bfb0db2e2c..bda53150a6 100644
--- a/include/cpu.h
+++ b/include/cpu.h
@@ -15,15 +15,20 @@
  * device.
  *
  * @cpu_id:	Platform-specific way of identifying the CPU.
+ * @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
  */
 struct cpu_platdata {
 	int cpu_id;
+	int ucode_version;
+	ulong device_id;
 };
 
 /* CPU features - mostly just a placeholder for now */
 enum {
 	CPU_FEAT_L1_CACHE	= 0,	/* Supports level 1 cache */
 	CPU_FEAT_MMU		= 1,	/* Supports virtual memory */
+	CPU_FEAT_UCODE		= 2,	/* Requires/uses microcode */
+	CPU_FEAT_DEVICE_ID	= 3,	/* Provides a device ID */
 
 	CPU_FEAT_COUNT,
 };