arch/arc/include/asm/arcregs.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. All rights reserved.
 */

#ifndef _ASM_ARC_ARCREGS_H
#define _ASM_ARC_ARCREGS_H

#include <asm/cache.h>
#include <config.h>

/*
 * ARC architecture has additional address space - auxiliary registers.
 * These registers are mostly used for configuration purposes.
 * These registers are not memory mapped and special commands are used for
 * access: "lr"/"sr".
 */

/*
 * Typically 8 least significant bits of Build Configuration Register (BCR)
 * describe version of the HW block in question. Moreover if decoded version
 * is 0 this means given HW block is absent - this is especially useful because
 * we may safely read BRC regardless HW block existence while an attempt to
 * access any other AUX regs associated with this HW block lead to imediate
 * "instruction error" exception.
 *
 * I.e. before using any cofigurable HW block it's required to make sure it
 * exists at all, and for that we introduce a special macro below.
 */
#define ARC_BCR_VERSION_MASK	GENMASK(7, 0)
#define ARC_FEATURE_EXISTS(bcr)	!!(__builtin_arc_lr(bcr) & ARC_BCR_VERSION_MASK)

#define ARC_AUX_IDENTITY	0x04
#define ARC_AUX_STATUS32	0x0a

/* STATUS32 Bits Positions */
#define STATUS_AD_BIT		19	/* Enable unaligned access */

/* Instruction cache related auxiliary registers */
#define ARC_AUX_IC_IVIC		0x10
#define ARC_AUX_IC_CTRL		0x11
#define ARC_AUX_IC_IVIL		0x19
#if (CONFIG_ARC_MMU_VER == 3)
#define ARC_AUX_IC_PTAG		0x1E
#endif
#define ARC_BCR_IC_BUILD	0x77
#define AUX_AUX_CACHE_LIMIT		0x5D
#define ARC_AUX_NON_VOLATILE_LIMIT	0x5E

/* ICCM and DCCM auxiliary registers */
#define ARC_AUX_DCCM_BASE	0x18	/* DCCM Base Addr ARCv2 */
#define ARC_AUX_ICCM_BASE	0x208	/* ICCM Base Addr ARCv2 */

/* CSM auxiliary registers */
#define ARC_AUX_CSM_ENABLE	0x9A0

/* Timer related auxiliary registers */
#define ARC_AUX_TIMER0_CNT	0x21	/* Timer 0 count */
#define ARC_AUX_TIMER0_CTRL	0x22	/* Timer 0 control */
#define ARC_AUX_TIMER0_LIMIT	0x23	/* Timer 0 limit */

#define ARC_AUX_TIMER1_CNT	0x100	/* Timer 1 count */
#define ARC_AUX_TIMER1_CTRL	0x101	/* Timer 1 control */
#define ARC_AUX_TIMER1_LIMIT	0x102	/* Timer 1 limit */

#define ARC_AUX_INTR_VEC_BASE	0x25

/* Data cache related auxiliary registers */
#define ARC_AUX_DC_IVDC		0x47
#define ARC_AUX_DC_CTRL		0x48

#define ARC_AUX_DC_IVDL		0x4A
#define ARC_AUX_DC_FLSH		0x4B
#define ARC_AUX_DC_FLDL		0x4C
#if (CONFIG_ARC_MMU_VER == 3)
#define ARC_AUX_DC_PTAG		0x5C
#endif
#define ARC_BCR_DC_BUILD	0x72
#define ARC_BCR_SLC		0xce
#define ARC_AUX_SLC_CONFIG	0x901
#define ARC_AUX_SLC_CTRL	0x903
#define ARC_AUX_SLC_FLUSH	0x904
#define ARC_AUX_SLC_INVALIDATE	0x905
#define ARC_AUX_SLC_IVDL	0x910
#define ARC_AUX_SLC_FLDL	0x912
#define ARC_AUX_SLC_RGN_START	0x914
#define ARC_AUX_SLC_RGN_START1	0x915
#define ARC_AUX_SLC_RGN_END	0x916
#define ARC_AUX_SLC_RGN_END1	0x917
#define ARC_BCR_CLUSTER		0xcf

/* MMU Management regs */
#define ARC_AUX_MMU_BCR		0x6f

/* IO coherency related auxiliary registers */
#define ARC_AUX_IO_COH_ENABLE	0x500
#define ARC_AUX_IO_COH_PARTIAL	0x501
#define ARC_AUX_IO_COH_AP0_BASE	0x508
#define ARC_AUX_IO_COH_AP0_SIZE	0x509

/* XY-memory related */
#define ARC_AUX_XY_BUILD	0x79

/* DSP-extensions related auxiliary registers */
#define ARC_AUX_DSP_BUILD	0x7A
#define ARC_AUX_DSP_CTRL	0x59F

/* ARC Subsystems related auxiliary registers */
#define ARC_AUX_SUBSYS_BUILD	0xF0

#ifndef __ASSEMBLY__
#include <linux/bitops.h>

/* Accessors for auxiliary registers */
#define read_aux_reg(reg)	__builtin_arc_lr(reg)

/* gcc builtin sr needs reg param to be long immediate */
#define write_aux_reg(reg_immed, val)		\
		__builtin_arc_sr((unsigned int)val, reg_immed)

/* ARCNUM [15:8] - field to identify each core in a multi-core system */
#define CPU_ID_GET()	((read_aux_reg(ARC_AUX_IDENTITY) & 0xFF00) >> 8)

static const inline int is_isa_arcv2(void)
{
	return IS_ENABLED(CONFIG_ISA_ARCV2);
}

static const inline int is_isa_arcompact(void)
{
	return IS_ENABLED(CONFIG_ISA_ARCOMPACT);
}
#endif /* __ASSEMBLY__ */

#endif /* _ASM_ARC_ARCREGS_H */