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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 <mhu.h>
#include <platform.h>
#include <scp_bootloader.h>
#include <scpi.h>
/* Boot commands sent from AP -> SCP */
#define BOOT_CMD_START 0x01
#define BOOT_CMD_DATA 0x02
typedef struct {
uint32_t image_size;
} cmd_start_payload;
typedef struct {
uint32_t sequence_num;
uint32_t offset;
uint32_t size;
} cmd_data_payload;
#define BOOT_DATA_MAX_SIZE 0x1000
/* Boot commands sent from SCP -> AP */
#define BOOT_CMD_ACK 0x03
#define BOOT_CMD_NACK 0x04
typedef struct {
uint32_t sequence_num;
} cmd_ack_payload;
/*
* Unlike the runtime protocol, the boot protocol uses the same memory region
* for both AP -> SCP and SCP -> AP transfers; define the address of this...
*/
static void * const cmd_payload = (void *)(MHU_SECURE_BASE + 0x0080);
static void *scp_boot_message_start(void)
{
mhu_secure_message_start();
return cmd_payload;
}
static void scp_boot_message_send(unsigned command, size_t size)
{
/* Make sure payload can be seen by SCP */
if (MHU_PAYLOAD_CACHED)
flush_dcache_range((unsigned long)cmd_payload, size);
/* Send command to SCP */
mhu_secure_message_send(command | (size << 8));
}
static uint32_t scp_boot_message_wait(size_t size)
{
uint32_t response = mhu_secure_message_wait();
/* Make sure we see the reply from the SCP and not any stale data */
if (MHU_PAYLOAD_CACHED)
inv_dcache_range((unsigned long)cmd_payload, size);
return response & 0xff;
}
static void scp_boot_message_end(void)
{
mhu_secure_message_end();
}
static int transfer_block(uint32_t sequence_num, uint32_t offset, uint32_t size)
{
cmd_data_payload *cmd_data = scp_boot_message_start();
cmd_data->sequence_num = sequence_num;
cmd_data->offset = offset;
cmd_data->size = size;
scp_boot_message_send(BOOT_CMD_DATA, sizeof(*cmd_data));
cmd_ack_payload *cmd_ack = cmd_payload;
int ok = scp_boot_message_wait(sizeof(*cmd_ack)) == BOOT_CMD_ACK
&& cmd_ack->sequence_num == sequence_num;
scp_boot_message_end();
return ok;
}
int scp_bootloader_transfer(void *image, unsigned int image_size)
{
uintptr_t offset = (uintptr_t)image - MHU_SECURE_BASE;
uintptr_t end = offset + image_size;
uint32_t response;
mhu_secure_init();
/* Initiate communications with SCP */
do {
cmd_start_payload *cmd_start = scp_boot_message_start();
cmd_start->image_size = image_size;
scp_boot_message_send(BOOT_CMD_START, sizeof(*cmd_start));
response = scp_boot_message_wait(0);
scp_boot_message_end();
} while (response != BOOT_CMD_ACK);
/* Transfer image to SCP a block at a time */
uint32_t sequence_num = 1;
size_t size;
while ((size = end - offset) != 0) {
if (size > BOOT_DATA_MAX_SIZE)
size = BOOT_DATA_MAX_SIZE;
while (!transfer_block(sequence_num, offset, size))
; /* Retry forever */
offset += size;
sequence_num++;
}
/* Wait for SCP to signal it's ready */
return scpi_wait_ready();
}
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