cpu: add release_core callback

Add a new callback release_core to the cpu_ops, which is used to
release a CPU core to run baremetal or RTOS application on a SoC
with multiple CPU cores.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Author: Zhiqiang-Hou

drivers/cpu/cpu-uclass.c

@@ -104,6 +104,16 @@ int cpu_get_vendor(const struct udevice *dev, char *buf, int size)
 	return ops->get_vendor(dev, buf, size);
 }
 
+int cpu_release_core(const struct udevice *dev, phys_addr_t addr)
+{
+	struct cpu_ops *ops = cpu_get_ops(dev);
+
+	if (!ops->release_core)
+		return -ENOSYS;
+
+	return ops->release_core(dev, addr);
+}
+
 U_BOOT_DRIVER(cpu_bus) = {
 	.name	= "cpu_bus",
 	.id	= UCLASS_SIMPLE_BUS,

include/cpu.h

@@ -102,6 +102,15 @@ struct cpu_ops {
 	 *         if not.
 	 */
 	int (*is_current)(struct udevice *dev);
+
+	/**
+	 * release_core() - Relase a CPU core to the given address to run application
+	 *
+	 * @dev:	Device to check (UCLASS_CPU)
+	 * @addr:	Address to relese the CPU core
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*release_core)(const struct udevice *dev, phys_addr_t addr);
 };
 
 #define cpu_get_ops(dev)        ((struct cpu_ops *)(dev)->driver->ops)
@@ -164,4 +173,10 @@ int cpu_is_current(struct udevice *cpu);
  */
 struct udevice *cpu_get_current_dev(void);
 
+/**
+ * cpu_release_core() - Relase a CPU core to the given address to run application
+ *
+ * @return 0 if OK, -ve on error
+ */
+int cpu_release_core(const struct udevice *dev, phys_addr_t addr);
 #endif