LXR linux/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
  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