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
11struct 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 */
24bool 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}
45EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);
46
47struct 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 */
68int 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}
90EXPORT_SYMBOL(imx_sc_rm_get_resource_owner);
91