Commit 6d240170 authored by Peng Fan's avatar Peng Fan Committed by Shawn Guo
Browse files

firmware: imx: add get resource owner api 



Add resource owner management API, this API could be used to check
whether M4 is under control of Linux.

Signed-off-by: default avatarPeng Fan <peng.fan@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 608d7c32

drivers/firmware/imx/rm.c

+45 −0
Original line number Diff line number Diff line
@@ -43,3 +43,48 @@ bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource) 
	return hdr->func;

}

EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);



struct imx_sc_msg_rm_get_resource_owner {

	struct imx_sc_rpc_msg hdr;

	union {

		struct {

			u16 resource;

		} req;

		struct {

			u8 val;

		} resp;

	} data;

} __packed __aligned(4);



/*

 * This function get @resource partition number

 *

 * @param[in]     ipc         IPC handle

 * @param[in]     resource    resource the control is associated with

 * @param[out]    pt          pointer to return the partition number

 *

 * @return Returns 0 for success and < 0 for errors.

 */

int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)

{

	struct imx_sc_msg_rm_get_resource_owner msg;

	struct imx_sc_rpc_msg *hdr = &msg.hdr;

	int ret;



	hdr->ver = IMX_SC_RPC_VERSION;

	hdr->svc = IMX_SC_RPC_SVC_RM;

	hdr->func = IMX_SC_RM_FUNC_GET_RESOURCE_OWNER;

	hdr->size = 2;



	msg.data.req.resource = resource;



	ret = imx_scu_call_rpc(ipc, &msg, true);

	if (ret)

		return ret;



	if (pt)

		*pt = msg.data.resp.val;



	return 0;

}

EXPORT_SYMBOL(imx_sc_rm_get_resource_owner);

include/linux/firmware/imx/svc/rm.h

+5 −0
Original line number Diff line number Diff line
@@ -59,11 +59,16 @@ enum imx_sc_rm_func { 


#if IS_ENABLED(CONFIG_IMX_SCU)

bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource);

int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt);

#else

static inline bool

imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)

{

	return true;

}

static inline int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)

{

	return -EOPNOTSUPP;

}

#endif

#endif