1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2020 NXP
4  *
5  * File containing client-side RPC functions for the RM service. These
6  * function are ported to clients that communicate to the SC.
7  */
8 
9 #include <linux/firmware/imx/svc/rm.h>
10 
11 struct imx_sc_msg_rm_rsrc_owned {
12 	struct imx_sc_rpc_msg hdr;
13 	u16 resource;
14 } __packed __aligned(4);
15 
16 /*
17  * This function check @resource is owned by current partition or not
18  *
19  * @param[in]     ipc         IPC handle
20  * @param[in]     resource    resource the control is associated with
21  *
22  * @return Returns 0 for not owned and 1 for owned.
23  */
imx_sc_rm_is_resource_owned(struct imx_sc_ipc * ipc,u16 resource)24 bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)
25 {
26 	struct imx_sc_msg_rm_rsrc_owned msg;
27 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
28 
29 	hdr->ver = IMX_SC_RPC_VERSION;
30 	hdr->svc = IMX_SC_RPC_SVC_RM;
31 	hdr->func = IMX_SC_RM_FUNC_IS_RESOURCE_OWNED;
32 	hdr->size = 2;
33 
34 	msg.resource = resource;
35 
36 	/*
37 	 * SCU firmware only returns value 0 or 1
38 	 * for resource owned check which means not owned or owned.
39 	 * So it is always successful.
40 	 */
41 	imx_scu_call_rpc(ipc, &msg, true);
42 
43 	return hdr->func;
44 }
45 EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);
46 
47 struct imx_sc_msg_rm_get_resource_owner {
48 	struct imx_sc_rpc_msg hdr;
49 	union {
50 		struct {
51 			u16 resource;
52 		} req;
53 		struct {
54 			u8 val;
55 		} resp;
56 	} data;
57 } __packed __aligned(4);
58 
59 /*
60  * This function get @resource partition number
61  *
62  * @param[in]     ipc         IPC handle
63  * @param[in]     resource    resource the control is associated with
64  * @param[out]    pt          pointer to return the partition number
65  *
66  * @return Returns 0 for success and < 0 for errors.
67  */
imx_sc_rm_get_resource_owner(struct imx_sc_ipc * ipc,u16 resource,u8 * pt)68 int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)
69 {
70 	struct imx_sc_msg_rm_get_resource_owner msg;
71 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
72 	int ret;
73 
74 	hdr->ver = IMX_SC_RPC_VERSION;
75 	hdr->svc = IMX_SC_RPC_SVC_RM;
76 	hdr->func = IMX_SC_RM_FUNC_GET_RESOURCE_OWNER;
77 	hdr->size = 2;
78 
79 	msg.data.req.resource = resource;
80 
81 	ret = imx_scu_call_rpc(ipc, &msg, true);
82 	if (ret)
83 		return ret;
84 
85 	if (pt)
86 		*pt = msg.data.resp.val;
87 
88 	return 0;
89 }
90 EXPORT_SYMBOL(imx_sc_rm_get_resource_owner);
91