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