101 lines
4.2 KiB
C
101 lines
4.2 KiB
C
/* $OpenBSD: bcm2835_mbox.h,v 1.1 2020/04/19 14:51:52 tobhe Exp $ */
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/*
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* Copyright (c) 2020 Tobias Heider <tobhe@openbsd.org>
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* Copyright (c) 2019 Neil Ashford <ashfordneil0@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nick Hudson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BCM2835_MBOX_H
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#define BCM2835_MBOX_H
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#define BCMMBOX_NUM_CHANNELS 16
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#define BCMMBOX_CHANNEL_MASK 0xf
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/* mailbox 0 (from VC) and mailbox 1 (to VC) */
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#define BCMMBOX_SIZE 0x80
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#define BCMMBOX_READ 0x00
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#define BCMMBOX_WRITE 0x00
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#define BCMMBOX_POLL 0x10 /* read without popping the fifo */
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#define BCMMBOX_ID 0x14 /* sender ID (bottom two bits) */
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#define BCMMBOX_STATUS 0x18 /* status */
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#define BCMMBOX_STATUS_FULL 0x80000000
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#define BCMMBOX_STATUS_EMPTY 0x40000000
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#define BCMMBOX_STATUS_LEVEL 0x400000FF
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#define BCMMBOX_CFG 0x1C /* configuration */
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#define BCMMBOX_CFG_DATA_IRQ_EN 0x00000001
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#define BCMMBOX_CFG_SPACE_IRQ_EN 0x00000002
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#define BCMMBOX_CFG_EMPTYOP_IRQ_EN 0x00000004
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#define BCMMBOX_CFG_MAIL_CLEAR 0x00000008
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#define BCMMBOX_CFG_DATA_PENDING 0x00000010
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#define BCMMBOX_CFG_SPACE_PENDING 0x00000020
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#define BCMMBOX_CFG_EMPTY_OP_PENDING 0x00000040
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#define BCMMBOX_CFG_E_NO_OWN 0x00000100
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#define BCMMBOX_CFG_E_OVERFLOW 0x00000200
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#define BCMMBOX_CFG_E_UNDERFLOW 0x00000400
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#define BCMMBOX0_BASE 0x00
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#define BCMMBOX1_BASE 0x20
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#define BCMMBOX0_READ (BCMMBOX0_BASE + BCMMBOX_READ)
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#define BCMMBOX0_WRITE (BCMMBOX0_BASE + BCMMBOX_WRITE)
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#define BCMMBOX0_POLL (BCMMBOX0_BASE + BCMMBOX_POLL)
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#define BCMMBOX0_ID (BCMMBOX0_BASE + BCMMBOX_ID)
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#define BCMMBOX0_STATUS (BCMMBOX0_BASE + BCMMBOX_STATUS)
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#define BCMMBOX0_CFG (BCMMBOX0_BASE + BCMMBOX_READ)
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#define BCMMBOX1_READ (BCMMBOX1_BASE + BCMMBOX_READ)
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#define BCMMBOX1_WRITE (BCMMBOX1_BASE + BCMMBOX_WRITE)
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#define BCMMBOX1_POLL (BCMMBOX1_BASE + BCMMBOX_POLL)
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#define BCMMBOX1_ID (BCMMBOX1_BASE + BCMMBOX_ID)
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#define BCMMBOX1_STATUS (BCMMBOX1_BASE + BCMMBOX_STATUS)
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#define BCMMBOX1_CFG (BCMMBOX1_BASE + BCMMBOX_READ)
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void bcmmbox_read(uint8_t chan, uint32_t *data);
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void bcmmbox_write(uint8_t chan, uint32_t data);
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int bcmmbox_post(uint8_t, void *, size_t, uint32_t *);
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#endif /* BCM2835_MBOX_H */
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