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/*
* Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <platform_def.h>
#include <arch_helpers.h>
#include <drivers/rpi3/mailbox/rpi3_mbox.h>
#define RPI3_MBOX_BUFFER_SIZE U(256)
static uint8_t __aligned(16) rpi3_mbox_buffer[RPI3_MBOX_BUFFER_SIZE];
/*******************************************************************************
* Request board revision. Returns the revision and 0 on success, -1 on error.
******************************************************************************/
int rpi3_vc_hardware_get_board_revision(uint32_t *revision)
{
uint32_t tag_request_size = sizeof(uint32_t);
rpi3_mbox_request_t *req = (rpi3_mbox_request_t *) rpi3_mbox_buffer;
assert(revision != NULL);
VERBOSE("rpi3: mbox: Sending request at %p\n", (void *)req);
req->size = sizeof(rpi3_mbox_buffer);
req->code = RPI3_MBOX_PROCESS_REQUEST;
req->tags[0] = RPI3_TAG_HARDWARE_GET_BOARD_REVISION;
req->tags[1] = tag_request_size; /* Space available for the response */
req->tags[2] = RPI3_TAG_REQUEST;
req->tags[3] = 0; /* Placeholder for the response */
req->tags[4] = RPI3_TAG_END;
rpi3_vc_mailbox_request_send(req, RPI3_MBOX_BUFFER_SIZE);
if (req->code != RPI3_MBOX_REQUEST_SUCCESSFUL) {
ERROR("rpi3: mbox: Code = 0x%08x\n", req->code);
return -1;
}
if (req->tags[2] != (RPI3_TAG_IS_RESPONSE | tag_request_size)) {
ERROR("rpi3: mbox: get board revision failed (0x%08x)\n",
req->tags[2]);
return -1;
}
*revision = req->tags[3];
return 0;
}
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