juno: Add SCPI interface and implement the SCP Ready command
The SCP Ready command is sent by the SCP to indicate that the BL3-0 RAM Firmware image is successfully up and running. Signed-off-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
Jon Medhurst
Sandrine Bailleux
parent
4d65df50de
commit
2e45bfd034
|
|
@ -0,0 +1,114 @@
|
|||
/*
|
||||
* 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 <mhu.h>
|
||||
#include <platform.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 */
|
||||
spci_status 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;
|
||||
}
|
||||
|
|
@ -0,0 +1,65 @@
|
|||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef __SCPI_H__
|
||||
#define __SCPI_H__
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stddef.h>
|
||||
|
||||
extern void *scpi_secure_message_start(void);
|
||||
extern void scpi_secure_message_send(unsigned command, size_t size);
|
||||
extern unsigned scpi_secure_message_receive(void ** message_out, size_t *size_out);
|
||||
extern void scpi_secure_message_end(void);
|
||||
|
||||
|
||||
enum {
|
||||
SCP_OK = 0, /* Success */
|
||||
SCP_E_PARAM, /* Invalid parameter(s) */
|
||||
SCP_E_ALIGN, /* Invalid alignment */
|
||||
SCP_E_SIZE, /* Invalid size */
|
||||
SCP_E_HANDLER, /* Invalid handler or callback */
|
||||
SCP_E_ACCESS, /* Invalid access or permission denied */
|
||||
SCP_E_RANGE, /* Value out of range */
|
||||
SCP_E_TIMEOUT, /* Time out has ocurred */
|
||||
SCP_E_NOMEM, /* Invalid memory area or pointer */
|
||||
SCP_E_PWRSTATE, /* Invalid power state */
|
||||
SCP_E_SUPPORT, /* Feature not supported or disabled */
|
||||
};
|
||||
|
||||
typedef uint32_t spci_status;
|
||||
|
||||
typedef enum {
|
||||
SCPI_CMD_SCP_READY = 0x01,
|
||||
} spci_command;
|
||||
|
||||
extern int scpi_wait_ready(void);
|
||||
|
||||
#endif /* __SCPI_H__ */
|
||||
Loading…
Reference in New Issue