1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright 2018 NXP 4 * 5 * Header file for the IPC implementation. 6 */ 7 8 #ifndef _SC_IPC_H 9 #define _SC_IPC_H 10 11 #include <linux/device.h> 12 #include <linux/types.h> 13 14 #define IMX_SC_RPC_VERSION 1 15 #define IMX_SC_RPC_MAX_MSG 8 16 17 struct imx_sc_ipc; 18 19 enum imx_sc_rpc_svc { 20 IMX_SC_RPC_SVC_UNKNOWN = 0, 21 IMX_SC_RPC_SVC_RETURN = 1, 22 IMX_SC_RPC_SVC_PM = 2, 23 IMX_SC_RPC_SVC_RM = 3, 24 IMX_SC_RPC_SVC_TIMER = 5, 25 IMX_SC_RPC_SVC_PAD = 6, 26 IMX_SC_RPC_SVC_MISC = 7, 27 IMX_SC_RPC_SVC_IRQ = 8, 28 }; 29 30 struct imx_sc_rpc_msg { 31 uint8_t ver; 32 uint8_t size; 33 uint8_t svc; 34 uint8_t func; 35 }; 36 37 #ifdef CONFIG_IMX_SCU 38 /* 39 * This is an function to send an RPC message over an IPC channel. 40 * It is called by client-side SCFW API function shims. 41 * 42 * @param[in] ipc IPC handle 43 * @param[in,out] msg handle to a message 44 * @param[in] have_resp response flag 45 * 46 * If have_resp is true then this function waits for a response 47 * and returns the result in msg. 48 */ 49 int imx_scu_call_rpc(struct imx_sc_ipc *ipc, void *msg, bool have_resp); 50 51 /* 52 * This function gets the default ipc handle used by SCU 53 * 54 * @param[out] ipc sc ipc handle 55 * 56 * @return Returns an error code (0 = success, failed if < 0) 57 */ 58 int imx_scu_get_handle(struct imx_sc_ipc **ipc); 59 #else 60 static inline int imx_scu_call_rpc(struct imx_sc_ipc *ipc, void *msg, 61 bool have_resp) 62 { 63 return -ENOTSUPP; 64 } 65 66 static inline int imx_scu_get_handle(struct imx_sc_ipc **ipc) 67 { 68 return -ENOTSUPP; 69 } 70 #endif 71 #endif /* _SC_IPC_H */ 72