forked from mirrors/linux
6d24017081
Add resource owner management API, this API could be used to check whether M4 is under control of Linux. Signed-off-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2020 NXP
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*
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* File containing client-side RPC functions for the RM service. These
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* function are ported to clients that communicate to the SC.
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*/
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#include <linux/firmware/imx/svc/rm.h>
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struct imx_sc_msg_rm_rsrc_owned {
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struct imx_sc_rpc_msg hdr;
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u16 resource;
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} __packed __aligned(4);
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/*
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* This function check @resource is owned by current partition or not
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*
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* @param[in] ipc IPC handle
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* @param[in] resource resource the control is associated with
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*
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* @return Returns 0 for not owned and 1 for owned.
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*/
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bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)
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{
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struct imx_sc_msg_rm_rsrc_owned msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_RM;
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hdr->func = IMX_SC_RM_FUNC_IS_RESOURCE_OWNED;
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hdr->size = 2;
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msg.resource = resource;
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/*
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* SCU firmware only returns value 0 or 1
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* for resource owned check which means not owned or owned.
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* So it is always successful.
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*/
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imx_scu_call_rpc(ipc, &msg, true);
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return hdr->func;
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}
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EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);
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struct imx_sc_msg_rm_get_resource_owner {
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struct imx_sc_rpc_msg hdr;
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union {
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struct {
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u16 resource;
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} req;
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struct {
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u8 val;
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} resp;
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} data;
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} __packed __aligned(4);
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/*
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* This function get @resource partition number
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*
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* @param[in] ipc IPC handle
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* @param[in] resource resource the control is associated with
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* @param[out] pt pointer to return the partition number
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*
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* @return Returns 0 for success and < 0 for errors.
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*/
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int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)
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{
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struct imx_sc_msg_rm_get_resource_owner msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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int ret;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_RM;
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hdr->func = IMX_SC_RM_FUNC_GET_RESOURCE_OWNER;
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hdr->size = 2;
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msg.data.req.resource = resource;
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ret = imx_scu_call_rpc(ipc, &msg, true);
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if (ret)
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return ret;
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if (pt)
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*pt = msg.data.resp.val;
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return 0;
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}
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EXPORT_SYMBOL(imx_sc_rm_get_resource_owner);
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