drivers/arm/cci400/cci400.c

/*
 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <cci400.h>
#include <mmio.h>
#include <platform_def.h>

static inline unsigned long get_slave_iface_base(unsigned long mpidr)
{
	return CCI400_BASE + SLAVE_IFACE_OFFSET(CCI400_SL_IFACE_INDEX(mpidr));
}

void cci_enable_coherency(unsigned long mpidr)
{
	/* Enable Snoops and DVM messages */
	mmio_write_32(get_slave_iface_base(mpidr) + SNOOP_CTRL_REG,
		      DVM_EN_BIT | SNOOP_EN_BIT);

	/* Wait for the dust to settle down */
	while (mmio_read_32(CCI400_BASE + STATUS_REG) & CHANGE_PENDING_BIT)
		;
}

void cci_disable_coherency(unsigned long mpidr)
{
	/* Disable Snoops and DVM messages */
	mmio_write_32(get_slave_iface_base(mpidr) + SNOOP_CTRL_REG,
		      ~(DVM_EN_BIT | SNOOP_EN_BIT));

	/* Wait for the dust to settle down */
	while (mmio_read_32(CCI400_BASE + STATUS_REG) & CHANGE_PENDING_BIT)
		;
}