cpu: Add get_vendor callback

The CPU udevice already has a few callbacks to retreive information
about the currently running CPUs. This patch adds a new get_vendor()
call that returns the vendor of the main CPUs.

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

arch/x86/cpu/baytrail/cpu.c

@@ -189,6 +189,7 @@ static const struct cpu_ops cpu_x86_baytrail_ops = {
 	.get_desc	= cpu_x86_get_desc,
 	.get_info	= baytrail_get_info,
 	.get_count	= baytrail_get_count,
+	.get_vendor	= cpu_x86_get_vendor,
 };
 
 static const struct udevice_id cpu_x86_baytrail_ids[] = {

arch/x86/cpu/broadwell/cpu.c

@@ -743,6 +743,7 @@ static const struct cpu_ops cpu_x86_broadwell_ops = {
 	.get_desc	= cpu_x86_get_desc,
 	.get_info	= broadwell_get_info,
 	.get_count	= broadwell_get_count,
+	.get_vendor	= cpu_x86_get_vendor,
 };
 
 static const struct udevice_id cpu_x86_broadwell_ids[] = {

arch/x86/cpu/cpu_x86.c

@@ -27,6 +27,18 @@ int cpu_x86_bind(struct udevice *dev)
 	return 0;
 }
 
+int cpu_x86_get_vendor(struct udevice *dev, char *buf, int size)
+{
+	const char *vendor = cpu_vendor_name(gd->arch.x86_vendor);
+
+	if (size < (strlen(vendor) + 1))
+		return -ENOSPC;
+
+	strcpy(buf, vendor);
+
+	return 0;
+}
+
 int cpu_x86_get_desc(struct udevice *dev, char *buf, int size)
 {
 	if (size < CPU_MAX_NAME_LEN)
@@ -65,6 +77,7 @@ static int cpu_x86_get_count(struct udevice *dev)
 static const struct cpu_ops cpu_x86_ops = {
 	.get_desc	= cpu_x86_get_desc,
 	.get_count	= cpu_x86_get_count,
+	.get_vendor	= cpu_x86_get_vendor,
 };
 
 static const struct udevice_id cpu_x86_ids[] = {

arch/x86/cpu/ivybridge/model_206ax.c

@@ -477,6 +477,7 @@ 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,
+	.get_vendor	= cpu_x86_get_vendor,
 };
 
 static const struct udevice_id cpu_x86_model_206ax_ids[] = {

arch/x86/include/asm/cpu_x86.h

@@ -31,4 +31,17 @@ int cpu_x86_bind(struct udevice *dev);
  */
 int cpu_x86_get_desc(struct udevice *dev, char *buf, int size);
 
+/**
+ * cpu_x86_get_vendor() - Get a vendor string for an x86 CPU
+ *
+ * This uses cpu_vendor_name() and is suitable to use as the get_vendor()
+ * method for the CPU uclass.
+ *
+ * @dev:	Device to check (UCLASS_CPU)
+ * @buf:	Buffer to place string
+ * @size:	Size of string space
+ * @return:	0 if OK, -ENOSPC if buffer is too small, other -ve on error
+ */
+int cpu_x86_get_vendor(struct udevice *dev, char *buf, int size);
+
 #endif /* _ASM_CPU_X86_H */

drivers/cpu/cpu-uclass.c

@@ -44,6 +44,16 @@ int cpu_get_count(struct udevice *dev)
 	return ops->get_count(dev);
 }
 
+int cpu_get_vendor(struct udevice *dev, char *buf, int size)
+{
+	struct cpu_ops *ops = cpu_get_ops(dev);
+
+	if (!ops->get_vendor)
+		return -ENOSYS;
+
+	return ops->get_vendor(dev, buf, size);
+}
+
 U_BOOT_DRIVER(cpu_bus) = {
 	.name	= "cpu_bus",
 	.id	= UCLASS_SIMPLE_BUS,

include/cpu.h

@@ -73,6 +73,16 @@ struct cpu_ops {
 	 * @return CPU count if OK, -ve on error
 	 */
 	int (*get_count)(struct udevice *dev);
+
+	/**
+	 * get_vendor() - Get vendor name of a CPU
+	 *
+	 * @dev:	Device to check (UCLASS_CPU)
+	 * @buf:	Buffer to place string
+	 * @size:	Size of string space
+	 * @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
+	 */
+	int (*get_vendor)(struct udevice *dev, char *buf, int size);
 };
 
 #define cpu_get_ops(dev)        ((struct cpu_ops *)(dev)->driver->ops)
@@ -104,4 +114,14 @@ int cpu_get_info(struct udevice *dev, struct cpu_info *info);
  */
 int cpu_get_count(struct udevice *dev);
 
+/**
+ * cpu_get_vendor() - Get vendor name of a CPU
+ *
+ * @dev:	Device to check (UCLASS_CPU)
+ * @buf:	Buffer to place string
+ * @size:	Size of string space
+ * @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
+ */
+int cpu_get_vendor(struct udevice *dev, char *buf, int size);
+
 #endif