/* Copyright 2020 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/* Control and status register */

/* TODO: move to core/riscv-rv32i? */

#ifndef __CROS_EC_CSR_H
#define __CROS_EC_CSR_H

#include "common.h"

static inline uint32_t read_csr(uint32_t reg)
{
	uint32_t val;

	asm volatile("csrr %0, %1" : "=r"(val) : "i"(reg));
	return val;
}

static inline void write_csr(uint32_t reg, uint32_t val)
{
	asm volatile ("csrw %0, %1" :: "i"(reg), "r"(val));
}

static inline uint32_t set_csr(uint32_t reg, uint32_t bit)
{
	uint32_t val;

	asm volatile ("csrrs %0, %1, %2" : "=r"(val) : "i"(reg), "r"(bit));
	return val;
}

static inline uint32_t clear_csr(uint32_t reg, uint32_t bit)
{
	uint32_t val;

	asm volatile ("csrrc %0, %1, %2" : "=r"(val) : "i"(reg), "r"(bit));
	return val;
}

/* VIC */
#define CSR_VIC_MICAUSE		(0x5c0)
#define CSR_VIC_MIEMS		(0x5c2)
#define CSR_VIC_MIPEND_G0	(0x5d0)
#define CSR_VIC_MIMASK_G0	(0x5d8)
#define CSR_VIC_MIWAKEUP_G0	(0x5e0)
#define CSR_VIC_MILSEL_G0	(0x5e8)
#define CSR_VIC_MIEMASK_G0	(0x5f0)

/* centralized control enable */
#define CSR_MCTREN		(0x7c0)
/* I$, D$, ITCM, DTCM, BTB, RAS, VIC, CG, mpu */
#define   CSR_MCTREN_ICACHE	BIT(0)
#define   CSR_MCTREN_DCACHE	BIT(1)
#define   CSR_MCTREN_ITCM	BIT(2)
#define   CSR_MCTREN_DTCM	BIT(3)
#define   CSR_MCTREN_BTB	BIT(4)
#define   CSR_MCTREN_RAS	BIT(5)
#define   CSR_MCTREN_VIC	BIT(6)
#define   CSR_MCTREN_CG		BIT(7)
#define   CSR_MCTREN_MPU	BIT(8)

/* MPU */
#define CSR_MPU_ENTRY_EN	(0x9c0)
#define CSR_MPU_LITCM		(0x9dc)
#define CSR_MPU_LDTCM		(0x9dd)
#define CSR_MPU_HITCM		(0x9de)
#define CSR_MPU_HDTCM		(0x9df)
#define CSR_MPU_L(n)		(0x9e0 + (n))
#define CSR_MPU_H(n)		(0x9f0 + (n))
/* MPU attributes: set if permitted */
/* Privilege, machine mode in RISC-V.  We don't use the flag because
 * we don't separate user / machine mode in EC OS. */
#define   MPU_ATTR_P		BIT(5)
/* Readable */
#define   MPU_ATTR_R		BIT(6)
/* Writable */
#define   MPU_ATTR_W		BIT(7)
/* Cacheable */
#define   MPU_ATTR_C		BIT(8)
/* Bufferable */
#define   MPU_ATTR_B		BIT(9)

/* PMU */
#define CSR_PMU_MPMUCTR		(0xbc0)
#define   CSR_PMU_MPMUCTR_C	BIT(0)
#define   CSR_PMU_MPMUCTR_I	BIT(1)
#define   CSR_PMU_MPMUCTR_H3	BIT(2)
#define   CSR_PMU_MPMUCTR_H4	BIT(3)
#define   CSR_PMU_MPMUCTR_H5	BIT(4)

#define CSR_PMU_MCYCLE		(0xb00)
#define CSR_PMU_MINSTRET	(0xb02)
#define CSR_PMU_MHPMCOUNTER3	(0xb03)
#define CSR_PMU_MHPMCOUNTER4	(0xb04)
#define CSR_PMU_MHPMCOUNTER5	(0xb05)

#define CSR_PMU_MCYCLEH		(0xb80)
#define CSR_PMU_MINSTRETH	(0xb82)
#define CSR_PMU_MHPMCOUNTER3H	(0xb83)
#define CSR_PMU_MHPMCOUNTER4H	(0xb84)
#define CSR_PMU_MHPMCOUNTER5H	(0xb85)

#define CSR_PMU_MHPMEVENT3	(0x323)
#define CSR_PMU_MHPMEVENT4	(0x324)
#define CSR_PMU_MHPMEVENT5	(0x325)

#endif /* __CROS_EC_CSR_H */