arch/mips/include/asm/mips-cpc.h

/*
 * Copyright (C) 2013 Imagination Technologies
 * Author: Paul Burton <paul.burton@mips.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#ifndef __MIPS_ASM_MIPS_CPS_H__
# error Please include asm/mips-cps.h rather than asm/mips-cpc.h
#endif

#ifndef __MIPS_ASM_MIPS_CPC_H__
#define __MIPS_ASM_MIPS_CPC_H__

#include <linux/bitops.h>
#include <linux/errno.h>

/* The base address of the CPC registers */
extern void __iomem *mips_cpc_base;

/**
 * mips_cpc_default_phys_base - retrieve the default physical base address of
 *                              the CPC
 *
 * Returns the default physical base address of the Cluster Power Controller
 * memory mapped registers. This is platform dependant & must therefore be
 * implemented per-platform.
 */
extern phys_addr_t mips_cpc_default_phys_base(void);

/**
 * mips_cpc_probe - probe for a Cluster Power Controller
 *
 * Attempt to detect the presence of a Cluster Power Controller. Returns 0 if
 * a CPC is successfully detected, else -errno.
 */
#ifdef CONFIG_MIPS_CPC
extern int mips_cpc_probe(void);
#else
static inline int mips_cpc_probe(void)
{
	return -ENODEV;
}
#endif

/**
 * mips_cpc_present - determine whether a Cluster Power Controller is present
 *
 * Returns true if a CPC is present in the system, else false.
 */
static inline bool mips_cpc_present(void)
{
#ifdef CONFIG_MIPS_CPC
	return mips_cpc_base != NULL;
#else
	return false;
#endif
}

/* Offsets from the CPC base address to various control blocks */
#define MIPS_CPC_GCB_OFS	0x0000
#define MIPS_CPC_CLCB_OFS	0x2000
#define MIPS_CPC_COCB_OFS	0x4000

#define CPC_ACCESSOR_RO(sz, off, name)					\
	CPS_ACCESSOR_RO(cpc, sz, MIPS_CPC_GCB_OFS + off, name)		\
	CPS_ACCESSOR_RO(cpc, sz, MIPS_CPC_COCB_OFS + off, redir_##name)

#define CPC_ACCESSOR_RW(sz, off, name)					\
	CPS_ACCESSOR_RW(cpc, sz, MIPS_CPC_GCB_OFS + off, name)		\
	CPS_ACCESSOR_RW(cpc, sz, MIPS_CPC_COCB_OFS + off, redir_##name)

#define CPC_CX_ACCESSOR_RO(sz, off, name)				\
	CPS_ACCESSOR_RO(cpc, sz, MIPS_CPC_CLCB_OFS + off, cl_##name)	\
	CPS_ACCESSOR_RO(cpc, sz, MIPS_CPC_COCB_OFS + off, co_##name)

#define CPC_CX_ACCESSOR_RW(sz, off, name)				\
	CPS_ACCESSOR_RW(cpc, sz, MIPS_CPC_CLCB_OFS + off, cl_##name)	\
	CPS_ACCESSOR_RW(cpc, sz, MIPS_CPC_COCB_OFS + off, co_##name)

/* CPC_ACCESS - Control core/IOCU access to CPC registers prior to CM 3 */
CPC_ACCESSOR_RW(32, 0x000, access)

/* CPC_SEQDEL - Configure delays between command sequencer steps */
CPC_ACCESSOR_RW(32, 0x008, seqdel)

/* CPC_RAIL - Configure the delay from rail power-up to stability */
CPC_ACCESSOR_RW(32, 0x010, rail)

/* CPC_RESETLEN - Configure the length of reset sequences */
CPC_ACCESSOR_RW(32, 0x018, resetlen)

/* CPC_REVISION - Indicates the revisison of the CPC */
CPC_ACCESSOR_RO(32, 0x020, revision)

/* CPC_PWRUP_CTL - Control power to the Coherence Manager (CM) */
CPC_ACCESSOR_RW(32, 0x030, pwrup_ctl)
#define CPC_PWRUP_CTL_CM_PWRUP			BIT(0)

/* CPC_CONFIG - Mirrors GCR_CONFIG */
CPC_ACCESSOR_RW(64, 0x138, config)

/* CPC_SYS_CONFIG - Control cluster endianness */
CPC_ACCESSOR_RW(32, 0x140, sys_config)
#define CPC_SYS_CONFIG_BE_IMMEDIATE		BIT(2)
#define CPC_SYS_CONFIG_BE_STATUS		BIT(1)
#define CPC_SYS_CONFIG_BE			BIT(0)

/* CPC_Cx_CMD - Instruct the CPC to take action on a core */
CPC_CX_ACCESSOR_RW(32, 0x000, cmd)
#define CPC_Cx_CMD				GENMASK(3, 0)
#define  CPC_Cx_CMD_CLOCKOFF			0x1
#define  CPC_Cx_CMD_PWRDOWN			0x2
#define  CPC_Cx_CMD_PWRUP			0x3
#define  CPC_Cx_CMD_RESET			0x4

/* CPC_Cx_STAT_CONF - Indicates core configuration & state */
CPC_CX_ACCESSOR_RW(32, 0x008, stat_conf)
#define CPC_Cx_STAT_CONF_PWRUPE			BIT(23)
#define CPC_Cx_STAT_CONF_SEQSTATE		GENMASK(22, 19)
#define  CPC_Cx_STAT_CONF_SEQSTATE_D0		0x0
#define  CPC_Cx_STAT_CONF_SEQSTATE_U0		0x1
#define  CPC_Cx_STAT_CONF_SEQSTATE_U1		0x2
#define  CPC_Cx_STAT_CONF_SEQSTATE_U2		0x3
#define  CPC_Cx_STAT_CONF_SEQSTATE_U3		0x4
#define  CPC_Cx_STAT_CONF_SEQSTATE_U4		0x5
#define  CPC_Cx_STAT_CONF_SEQSTATE_U5		0x6
#define  CPC_Cx_STAT_CONF_SEQSTATE_U6		0x7
#define  CPC_Cx_STAT_CONF_SEQSTATE_D1		0x8
#define  CPC_Cx_STAT_CONF_SEQSTATE_D3		0x9
#define  CPC_Cx_STAT_CONF_SEQSTATE_D2		0xa
#define CPC_Cx_STAT_CONF_CLKGAT_IMPL		BIT(17)
#define CPC_Cx_STAT_CONF_PWRDN_IMPL		BIT(16)
#define CPC_Cx_STAT_CONF_EJTAG_PROBE		BIT(15)

/* CPC_Cx_OTHER - Configure the core-other register block prior to CM 3 */
CPC_CX_ACCESSOR_RW(32, 0x010, other)
#define CPC_Cx_OTHER_CORENUM			GENMASK(23, 16)

/* CPC_Cx_VP_STOP - Stop Virtual Processors (VPs) within a core from running */
CPC_CX_ACCESSOR_RW(32, 0x020, vp_stop)

/* CPC_Cx_VP_START - Start Virtual Processors (VPs) within a core running */
CPC_CX_ACCESSOR_RW(32, 0x028, vp_run)

/* CPC_Cx_VP_RUNNING - Indicate which Virtual Processors (VPs) are running */
CPC_CX_ACCESSOR_RW(32, 0x030, vp_running)

/* CPC_Cx_CONFIG - Mirrors GCR_Cx_CONFIG */
CPC_CX_ACCESSOR_RW(32, 0x090, config)

#ifdef CONFIG_MIPS_CPC

/**
 * mips_cpc_lock_other - lock access to another core
 * core: the other core to be accessed
 *
 * Call before operating upon a core via the 'other' register region in
 * order to prevent the region being moved during access. Must be called
 * within the bounds of a mips_cm_{lock,unlock}_other pair, and followed
 * by a call to mips_cpc_unlock_other.
 */
extern void mips_cpc_lock_other(unsigned int core);

/**
 * mips_cpc_unlock_other - unlock access to another core
 *
 * Call after operating upon another core via the 'other' register region.
 * Must be called after mips_cpc_lock_other.
 */
extern void mips_cpc_unlock_other(void);

#else /* !CONFIG_MIPS_CPC */

static inline void mips_cpc_lock_other(unsigned int core) { }
static inline void mips_cpc_unlock_other(void) { }

#endif /* !CONFIG_MIPS_CPC */

#endif /* __MIPS_ASM_MIPS_CPC_H__ */