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
imx_scu_call_rpc(struct imx_sc_ipc * ipc,void * msg,bool have_resp)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
imx_scu_get_handle(struct imx_sc_ipc ** ipc)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