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