141 lines
4.4 KiB
C
141 lines
4.4 KiB
C
/*
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* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch_helpers.h>
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#include <platform.h>
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#include "juno_def.h"
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#include "mhu.h"
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#include "scpi.h"
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#define MHU_SECURE_SCP_TO_AP_PAYLOAD (MHU_SECURE_BASE+0x0080)
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#define MHU_SECURE_AP_TO_SCP_PAYLOAD (MHU_SECURE_BASE+0x0280)
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#define SIZE_SHIFT 20 /* Bit position for size value in MHU header */
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#define SIZE_MASK 0x1ff /* Mask to extract size value in MHU header*/
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void *scpi_secure_message_start(void)
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{
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mhu_secure_message_start();
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/* Return address of payload area. */
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return (void *)MHU_SECURE_AP_TO_SCP_PAYLOAD;
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}
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void scpi_secure_message_send(unsigned command, size_t size)
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{
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/* Make sure payload can be seen by SCP */
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if (MHU_PAYLOAD_CACHED)
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flush_dcache_range(MHU_SECURE_AP_TO_SCP_PAYLOAD, size);
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mhu_secure_message_send(command | (size << SIZE_SHIFT));
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}
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unsigned scpi_secure_message_receive(void **message_out, size_t *size_out)
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{
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uint32_t response = mhu_secure_message_wait();
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/* Get size of payload */
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size_t size = (response >> SIZE_SHIFT) & SIZE_MASK;
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/* Clear size from response */
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response &= ~(SIZE_MASK << SIZE_SHIFT);
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/* Make sure we don't read stale data */
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if (MHU_PAYLOAD_CACHED)
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inv_dcache_range(MHU_SECURE_SCP_TO_AP_PAYLOAD, size);
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if (size_out)
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*size_out = size;
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if (message_out)
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*message_out = (void *)MHU_SECURE_SCP_TO_AP_PAYLOAD;
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return response;
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}
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void scpi_secure_message_end(void)
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{
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mhu_secure_message_end();
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}
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static void scpi_secure_send32(unsigned command, uint32_t message)
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{
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*(__typeof__(message) *)scpi_secure_message_start() = message;
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scpi_secure_message_send(command, sizeof(message));
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scpi_secure_message_end();
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}
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int scpi_wait_ready(void)
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{
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/* Get a message from the SCP */
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scpi_secure_message_start();
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size_t size;
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unsigned command = scpi_secure_message_receive(NULL, &size);
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scpi_secure_message_end();
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/* We are expecting 'SCP Ready', produce correct error if it's not */
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scpi_status_t response = SCP_OK;
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if (command != SCPI_CMD_SCP_READY)
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response = SCP_E_SUPPORT;
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else if (size != 0)
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response = SCP_E_SIZE;
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/* Send our response back to SCP */
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scpi_secure_send32(command, response);
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return response == SCP_OK ? 0 : -1;
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}
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void scpi_set_css_power_state(unsigned mpidr, scpi_power_state_t cpu_state,
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scpi_power_state_t cluster_state, scpi_power_state_t css_state)
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{
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uint32_t state = mpidr & 0x0f; /* CPU ID */
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state |= (mpidr & 0xf00) >> 4; /* Cluster ID */
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state |= cpu_state << 8;
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state |= cluster_state << 12;
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state |= css_state << 16;
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scpi_secure_send32(SCPI_CMD_SET_CSS_POWER_STATE, state);
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}
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uint32_t scpi_sys_power_state(scpi_system_state_t system_state)
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{
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uint32_t *response;
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size_t size;
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uint8_t state = system_state & 0xff;
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/* Send the command */
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*(__typeof__(state) *)scpi_secure_message_start() = state;
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scpi_secure_message_send(SCPI_CMD_SYS_POWER_STATE, sizeof(state));
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scpi_secure_message_receive((void *)&response, &size);
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scpi_secure_message_end();
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return *response;
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}
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