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/* 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 {
	struct mbox_chan *mchan;
	u64 shmem_base_addr;
	void __iomem *shmem;
	u64 shmem_size;
	u32 latency;
	u32 max_access_rate;
	u16 min_turnaround_time;
};

/* Generic Communications Channel Shared Memory Region */
#define PCC_SIGNATURE			0x50434300
/* Generic Communications Channel Command Field */
#define PCC_CMD_GENERATE_DB_INTR	BIT(15)
/* Generic Communications Channel Status Field */
#define PCC_STATUS_CMD_COMPLETE		BIT(0)
#define PCC_STATUS_SCI_DOORBELL		BIT(1)
#define PCC_STATUS_ERROR		BIT(2)
#define PCC_STATUS_PLATFORM_NOTIFY	BIT(3)
/* Initiator Responder Communications Channel Flags */
#define PCC_CMD_COMPLETION_NOTIFY	BIT(0)

#define MAX_PCC_SUBSPACES	256
#define PCC_ACK_FLAG_MASK	0x1

#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);
extern int pcc_mbox_ioremap(struct 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) { }
static inline int pcc_mbox_ioremap(struct mbox_chan *chan)
{
	return 0;
};
#endif

#endif /* _PCC_H */