include/linux/mfd/intel-m10-bmc.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Intel MAX 10 Board Management Controller chip.
 *
 * Copyright (C) 2018-2020 Intel Corporation, Inc.
 */
#ifndef __MFD_INTEL_M10_BMC_H
#define __MFD_INTEL_M10_BMC_H

#include <linux/regmap.h>

#define M10BMC_LEGACY_SYS_BASE		0x300400
#define M10BMC_SYS_BASE			0x300800
#define M10BMC_MEM_END			0x1fffffff

/* Register offset of system registers */
#define NIOS2_FW_VERSION		0x0
#define M10BMC_TEST_REG			0x3c
#define M10BMC_BUILD_VER		0x68
#define M10BMC_VER_MAJOR_MSK		GENMASK(23, 16)
#define M10BMC_VER_PCB_INFO_MSK		GENMASK(31, 24)
#define M10BMC_VER_LEGACY_INVALID	0xffffffff

/**
 * struct intel_m10bmc - Intel MAX 10 BMC parent driver data structure
 * @dev: this device
 * @regmap: the regmap used to access registers by m10bmc itself
 */
struct intel_m10bmc {
	struct device *dev;
	struct regmap *regmap;
};

/*
 * register access helper functions.
 *
 * m10bmc_raw_read - read m10bmc register per addr
 * m10bmc_sys_read - read m10bmc system register per offset
 */
static inline int
m10bmc_raw_read(struct intel_m10bmc *m10bmc, unsigned int addr,
		unsigned int *val)
{
	int ret;

	ret = regmap_read(m10bmc->regmap, addr, val);
	if (ret)
		dev_err(m10bmc->dev, "fail to read raw reg %x: %d\n",
			addr, ret);

	return ret;
}

/*
 * The base of the system registers could be configured by HW developers, and
 * in HW SPEC, the base is not added to the addresses of the system registers.
 *
 * This macro helps to simplify the accessing of the system registers. And if
 * the base is reconfigured in HW, SW developers could simply change the
 * M10BMC_SYS_BASE accordingly.
 */
#define m10bmc_sys_read(m10bmc, offset, val) \
	m10bmc_raw_read(m10bmc, M10BMC_SYS_BASE + (offset), val)

#endif /* __MFD_INTEL_M10_BMC_H */