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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 "juno_private.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
- #if IMAGE_BL31
- #if USE_COHERENT_MEM
- static bakery_lock_t mhu_secure_lock __attribute__ ((section("tzfw_coherent_mem")));
- #define LOCK_ARG &mhu_secure_lock
- #else
- #define LOCK_ARG JUNO_MHU_BAKERY_ID
- #endif /*__USE_COHERENT_MEM__ */
- #else
- #define LOCK_ARG /* Locks required only for BL3-1 images */
- #endif /* __IMAGE_BL31__ */
- void mhu_secure_message_start(void)
- {
- juno_lock_get(LOCK_ARG);
- /* 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);
- juno_lock_release(LOCK_ARG);
- }
- void mhu_secure_init(void)
- {
- juno_lock_init(LOCK_ARG);
- /*
- * 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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