linux/include/acpi/pcc.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * PCC (Platform Communications Channel) methods
 */

#ifndef _PCC_H
#define _PCC_H

#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.h>

struct pcc_mbox_chan { … };

/* Generic Communications Channel Shared Memory Region */
#define PCC_SIGNATURE …
/* Generic Communications Channel Command Field */
#define PCC_CMD_GENERATE_DB_INTR …
/* Generic Communications Channel Status Field */
#define PCC_STATUS_CMD_COMPLETE …
#define PCC_STATUS_SCI_DOORBELL …
#define PCC_STATUS_ERROR …
#define PCC_STATUS_PLATFORM_NOTIFY …
/* Initiator Responder Communications Channel Flags */
#define PCC_CMD_COMPLETION_NOTIFY …

#define MAX_PCC_SUBSPACES …

#ifdef CONFIG_PCC
extern struct pcc_mbox_chan *
pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
#else
static inline struct pcc_mbox_chan *
pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
{
	return ERR_PTR(-ENODEV);
}
static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
#endif

#endif /* _PCC_H */