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/*
* Copyright (c) 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 <arch_helpers.h>
#include <bakery_lock.h>
#include <mmio.h>
#include "juno_def.h"
#include "mhu.h"
/* SCP MHU secure channel registers */
#define SCP_INTR_S_STAT 0x200
#define SCP_INTR_S_SET 0x208
#define SCP_INTR_S_CLEAR 0x210
/* CPU MHU secure channel registers */
#define CPU_INTR_S_STAT 0x300
#define CPU_INTR_S_SET 0x308
#define CPU_INTR_S_CLEAR 0x310
static bakery_lock_t mhu_secure_lock __attribute__ ((section("tzfw_coherent_mem")));
void mhu_secure_message_start(void)
{
bakery_lock_get(read_mpidr(), &mhu_secure_lock);
/* Make sure any previous command has finished */
while (mmio_read_32(MHU_BASE + CPU_INTR_S_STAT) != 0)
;
}
void mhu_secure_message_send(uint32_t command)
{
/* Send command to SCP and wait for it to pick it up */
mmio_write_32(MHU_BASE + CPU_INTR_S_SET, command);
while (mmio_read_32(MHU_BASE + CPU_INTR_S_STAT) != 0)
;
}
uint32_t mhu_secure_message_wait(void)
{
/* Wait for response from SCP */
uint32_t response;
while (!(response = mmio_read_32(MHU_BASE + SCP_INTR_S_STAT)))
;
return response;
}
void mhu_secure_message_end(void)
{
/* Clear any response we got by writing all ones to the CLEAR register */
mmio_write_32(MHU_BASE + SCP_INTR_S_CLEAR, 0xffffffffu);
bakery_lock_release(read_mpidr(), &mhu_secure_lock);
}
void mhu_secure_init(void)
{
bakery_lock_init(&mhu_secure_lock);
/*
* Clear the CPU's INTR register to make sure we don't see a stale
* or garbage value and think it's a message we've already sent.
*/
mmio_write_32(MHU_BASE + CPU_INTR_S_CLEAR, 0xffffffffu);
}
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