/*
 * AMD Platform Security Processor (PSP) interface driver
 *
 * Copyright (C) 2017 Advanced Micro Devices, Inc.
 *
 * Author: Brijesh Singh <brijesh.singh@amd.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __PSP_DEV_H__
#define __PSP_DEV_H__

#include <linux/device.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/dmapool.h>
#include <linux/hw_random.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/dmaengine.h>
#include <linux/psp-sev.h>
#include <linux/miscdevice.h>

#include "sp-dev.h"

#define PSP_C2PMSG(_num)		((_num) << 2)
#define PSP_CMDRESP			PSP_C2PMSG(32)
#define PSP_CMDBUFF_ADDR_LO		PSP_C2PMSG(56)
#define PSP_CMDBUFF_ADDR_HI             PSP_C2PMSG(57)
#define PSP_FEATURE_REG			PSP_C2PMSG(63)

#define PSP_P2CMSG(_num)		((_num) << 2)
#define PSP_CMD_COMPLETE_REG		1
#define PSP_CMD_COMPLETE		PSP_P2CMSG(PSP_CMD_COMPLETE_REG)

#define PSP_P2CMSG_INTEN		0x0110
#define PSP_P2CMSG_INTSTS		0x0114

#define PSP_C2PMSG_ATTR_0		0x0118
#define PSP_C2PMSG_ATTR_1		0x011c
#define PSP_C2PMSG_ATTR_2		0x0120
#define PSP_C2PMSG_ATTR_3		0x0124
#define PSP_P2CMSG_ATTR_0		0x0128

#define PSP_CMDRESP_CMD_SHIFT		16
#define PSP_CMDRESP_IOC			BIT(0)
#define PSP_CMDRESP_RESP		BIT(31)
#define PSP_CMDRESP_ERR_MASK		0xffff

#define MAX_PSP_NAME_LEN		16

struct sev_misc_dev {
	struct kref refcount;
	struct miscdevice misc;
};

struct psp_device {
	struct list_head entry;

	struct psp_vdata *vdata;
	char name[MAX_PSP_NAME_LEN];

	struct device *dev;
	struct sp_device *sp;

	void __iomem *io_regs;

	int sev_state;
	unsigned int sev_int_rcvd;
	wait_queue_head_t sev_int_queue;
	struct sev_misc_dev *sev_misc;
	struct sev_user_data_status status_cmd_buf;
	struct sev_data_init init_cmd_buf;
};

#endif /* __PSP_DEV_H */
