1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * PCC (Platform Communications Channel) methods
 
 
 
 
 
 4 */
 5
 6#ifndef _PCC_H
 7#define _PCC_H
 8
 9#include <linux/mailbox_controller.h>
10#include <linux/mailbox_client.h>
11
12struct pcc_mbox_chan {
13	struct mbox_chan *mchan;
14	u64 shmem_base_addr;
15	u64 shmem_size;
16	u32 latency;
17	u32 max_access_rate;
18	u16 min_turnaround_time;
19};
20
21/* Generic Communications Channel Shared Memory Region */
22#define PCC_SIGNATURE			0x50434300
23/* Generic Communications Channel Command Field */
24#define PCC_CMD_GENERATE_DB_INTR	BIT(15)
25/* Generic Communications Channel Status Field */
26#define PCC_STATUS_CMD_COMPLETE		BIT(0)
27#define PCC_STATUS_SCI_DOORBELL		BIT(1)
28#define PCC_STATUS_ERROR		BIT(2)
29#define PCC_STATUS_PLATFORM_NOTIFY	BIT(3)
30/* Initiator Responder Communications Channel Flags */
31#define PCC_CMD_COMPLETION_NOTIFY	BIT(0)
32
33#define MAX_PCC_SUBSPACES	256
34
35#ifdef CONFIG_PCC
36extern struct pcc_mbox_chan *
37pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
38extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
39#else
40static inline struct pcc_mbox_chan *
41pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
42{
43	return ERR_PTR(-ENODEV);
44}
45static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
46#endif
47
48#endif /* _PCC_H */

 
 1/*
 2 * PCC (Platform Communications Channel) methods
 3 *
 4 * This program is free software; you can redistribute it and/or
 5 * modify it under the terms of the GNU General Public License
 6 * as published by the Free Software Foundation; version 2
 7 * of the License.
 8 */
 9
10#ifndef _PCC_H
11#define _PCC_H
12
13#include <linux/mailbox_controller.h>
14#include <linux/mailbox_client.h>
15
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16#ifdef CONFIG_PCC
17extern struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
18						  int subspace_id);
19extern void pcc_mbox_free_channel(struct mbox_chan *chan);
20#else
21static inline struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
22							 int subspace_id)
23{
24	return ERR_PTR(-ENODEV);
25}
26static inline void pcc_mbox_free_channel(struct mbox_chan *chan) { }
27#endif
28
29#endif /* _PCC_H */