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firmware: imx: add get resource owner api

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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>
This commit is contained in:
Peng Fan 2022-02-07 10:05:40 +08:00 committed by Shawn Guo
parent 608d7c325e
commit 6d24017081
2 changed files with 50 additions and 0 deletions
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45
drivers/firmware/imx/rm.c
View File

@ -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);

5
include/linux/firmware/imx/svc/rm.h
View File

@ -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