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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 <platform.h>
#include "sunxi_def.h"
#include "mhu.h"
#include "scpi.h"
#define MHU_SECURE_SCP_TO_AP_PAYLOAD (MHU_SECURE_BASE+0x0080)
#define MHU_SECURE_AP_TO_SCP_PAYLOAD (MHU_SECURE_BASE+0x0280)
#define SIZE_SHIFT 20 /* Bit position for size value in MHU header */
#define SIZE_MASK 0x1ff /* Mask to extract size value in MHU header*/
void *scpi_secure_message_start(void)
{
mhu_secure_message_start();
/* Return address of payload area. */
return (void *)MHU_SECURE_AP_TO_SCP_PAYLOAD;
}
void scpi_secure_message_send(unsigned command, size_t size)
{
/* Make sure payload can be seen by SCP */
if (MHU_PAYLOAD_CACHED)
flush_dcache_range(MHU_SECURE_AP_TO_SCP_PAYLOAD, size);
mhu_secure_message_send(command | (size << SIZE_SHIFT));
}
unsigned scpi_secure_message_receive(void **message_out, size_t *size_out)
{
uint32_t response = mhu_secure_message_wait();
/* Get size of payload */
size_t size = (response >> SIZE_SHIFT) & SIZE_MASK;
/* Clear size from response */
response &= ~(SIZE_MASK << SIZE_SHIFT);
/* Make sure we don't read stale data */
if (MHU_PAYLOAD_CACHED)
inv_dcache_range(MHU_SECURE_SCP_TO_AP_PAYLOAD, size);
if (size_out)
*size_out = size;
if (message_out)
*message_out = (void *)MHU_SECURE_SCP_TO_AP_PAYLOAD;
return response;
}
void scpi_secure_message_end(void)
{
mhu_secure_message_end();
}
static void scpi_secure_send32(unsigned command, uint32_t message)
{
*(__typeof__(message) *)scpi_secure_message_start() = message;
scpi_secure_message_send(command, sizeof(message));
scpi_secure_message_end();
}
int scpi_wait_ready(void)
{
/* Get a message from the SCP */
scpi_secure_message_start();
size_t size;
unsigned command = scpi_secure_message_receive(NULL, &size);
scpi_secure_message_end();
/* We are expecting 'SCP Ready', produce correct error if it's not */
scpi_status_t response = SCP_OK;
if (command != SCPI_CMD_SCP_READY)
response = SCP_E_SUPPORT;
else if (size != 0)
response = SCP_E_SIZE;
/* Send our response back to SCP */
scpi_secure_send32(command, response);
return response == SCP_OK ? 0 : -1;
}
void scpi_set_css_power_state(unsigned mpidr, scpi_power_state_t cpu_state,
scpi_power_state_t cluster_state, scpi_power_state_t css_state)
{
uint32_t state = mpidr & 0x0f; /* CPU ID */
state |= (mpidr & 0xf00) >> 4; /* Cluster ID */
state |= cpu_state << 8;
state |= cluster_state << 12;
state |= css_state << 16;
scpi_secure_send32(SCPI_CMD_SET_CSS_POWER_STATE, state);
}
uint32_t scpi_sys_power_state(scpi_system_state_t system_state)
{
uint32_t *response;
size_t size;
uint8_t state = system_state & 0xff;
/* Send the command */
*(__typeof__(state) *)scpi_secure_message_start() = state;
scpi_secure_message_send(SCPI_CMD_SYS_POWER_STATE, sizeof(state));
scpi_secure_message_receive((void *)&response, &size);
scpi_secure_message_end();
return *response;
}
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