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 
12 struct 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
36 extern struct pcc_mbox_chan *
37 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
38 extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
39 #else
40 static inline struct pcc_mbox_chan *
pcc_mbox_request_channel(struct mbox_client * cl,int subspace_id)41 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
42 {
43 	return ERR_PTR(-ENODEV);
44 }
pcc_mbox_free_channel(struct pcc_mbox_chan * chan)45 static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
46 #endif
47 
48 #endif /* _PCC_H */
49