drivers/firmware/imx/rm.c

   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  */
  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);