tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 void __iomem *shmem;
16 u64 shmem_size;
17 u32 latency;
18 u32 max_access_rate;
19 u16 min_turnaround_time;
20};
21
22/* Generic Communications Channel Shared Memory Region */
23#define PCC_SIGNATURE 0x50434300
24/* Generic Communications Channel Command Field */
25#define PCC_CMD_GENERATE_DB_INTR BIT(15)
26/* Generic Communications Channel Status Field */
27#define PCC_STATUS_CMD_COMPLETE BIT(0)
28#define PCC_STATUS_SCI_DOORBELL BIT(1)
29#define PCC_STATUS_ERROR BIT(2)
30#define PCC_STATUS_PLATFORM_NOTIFY BIT(3)
31/* Initiator Responder Communications Channel Flags */
32#define PCC_CMD_COMPLETION_NOTIFY BIT(0)
33
34#define MAX_PCC_SUBSPACES 256
35
36#ifdef CONFIG_PCC
37extern struct pcc_mbox_chan *
38pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
39extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
40#else
41static inline struct pcc_mbox_chan *
42pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
43{
44 return ERR_PTR(-ENODEV);
45}
46static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
47#endif
48
49#endif /* _PCC_H */