firmware: imx: Add support to start/stop a CPU

This is done via RPC call to SCU.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/firmware/imx/misc.c

@@ -18,6 +18,14 @@ struct imx_sc_msg_req_misc_set_ctrl {
 	u16 resource;
 } __packed;
 
+struct imx_sc_msg_req_cpu_start {
+	struct imx_sc_rpc_msg hdr;
+	u32 address_hi;
+	u32 address_lo;
+	u16 resource;
+	u8 enable;
+} __packed;
+
 struct imx_sc_msg_req_misc_get_ctrl {
 	struct imx_sc_rpc_msg hdr;
 	u32 ctrl;
@@ -97,3 +105,33 @@ int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
 	return 0;
 }
 EXPORT_SYMBOL(imx_sc_misc_get_control);
+
+/*
+ * This function starts/stops a CPU identified by @resource
+ *
+ * @param[in]     ipc         IPC handle
+ * @param[in]     resource    resource the control is associated with
+ * @param[in]     enable      true for start, false for stop
+ * @param[in]     phys_addr   initial instruction address to be executed
+ *
+ * @return Returns 0 for success and < 0 for errors.
+ */
+int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
+			bool enable, u64 phys_addr)
+{
+	struct imx_sc_msg_req_cpu_start msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_CPU_START;
+	hdr->size = 4;
+
+	msg.address_hi = phys_addr >> 32;
+	msg.address_lo = phys_addr;
+	msg.resource = resource;
+	msg.enable = enable;
+
+	return imx_scu_call_rpc(ipc, &msg, true);
+}
+EXPORT_SYMBOL(imx_sc_pm_cpu_start);

include/linux/firmware/imx/svc/misc.h

@@ -52,4 +52,7 @@ int imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32 resource,
 int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
 			    u8 ctrl, u32 *val);
 
+int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
+			bool enable, u64 phys_addr);
+
 #endif /* _SC_MISC_API_H */