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/* $OpenBSD: bcm2835_mbox.h,v 1.1 2020/04/19 14:51:52 tobhe Exp $ */
/*
* Copyright (c) 2020 Tobias Heider <tobhe@openbsd.org>
* Copyright (c) 2019 Neil Ashford <ashfordneil0@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nick Hudson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 BCM2835_MBOX_H
#define BCM2835_MBOX_H
#define BCMMBOX_NUM_CHANNELS 16
#define BCMMBOX_CHANNEL_MASK 0xf
/* mailbox 0 (from VC) and mailbox 1 (to VC) */
#define BCMMBOX_SIZE 0x80
#define BCMMBOX_READ 0x00
#define BCMMBOX_WRITE 0x00
#define BCMMBOX_POLL 0x10 /* read without popping the fifo */
#define BCMMBOX_ID 0x14 /* sender ID (bottom two bits) */
#define BCMMBOX_STATUS 0x18 /* status */
#define BCMMBOX_STATUS_FULL 0x80000000
#define BCMMBOX_STATUS_EMPTY 0x40000000
#define BCMMBOX_STATUS_LEVEL 0x400000FF
#define BCMMBOX_CFG 0x1C /* configuration */
#define BCMMBOX_CFG_DATA_IRQ_EN 0x00000001
#define BCMMBOX_CFG_SPACE_IRQ_EN 0x00000002
#define BCMMBOX_CFG_EMPTYOP_IRQ_EN 0x00000004
#define BCMMBOX_CFG_MAIL_CLEAR 0x00000008
#define BCMMBOX_CFG_DATA_PENDING 0x00000010
#define BCMMBOX_CFG_SPACE_PENDING 0x00000020
#define BCMMBOX_CFG_EMPTY_OP_PENDING 0x00000040
#define BCMMBOX_CFG_E_NO_OWN 0x00000100
#define BCMMBOX_CFG_E_OVERFLOW 0x00000200
#define BCMMBOX_CFG_E_UNDERFLOW 0x00000400
#define BCMMBOX0_BASE 0x00
#define BCMMBOX1_BASE 0x20
#define BCMMBOX0_READ (BCMMBOX0_BASE + BCMMBOX_READ)
#define BCMMBOX0_WRITE (BCMMBOX0_BASE + BCMMBOX_WRITE)
#define BCMMBOX0_POLL (BCMMBOX0_BASE + BCMMBOX_POLL)
#define BCMMBOX0_ID (BCMMBOX0_BASE + BCMMBOX_ID)
#define BCMMBOX0_STATUS (BCMMBOX0_BASE + BCMMBOX_STATUS)
#define BCMMBOX0_CFG (BCMMBOX0_BASE + BCMMBOX_READ)
#define BCMMBOX1_READ (BCMMBOX1_BASE + BCMMBOX_READ)
#define BCMMBOX1_WRITE (BCMMBOX1_BASE + BCMMBOX_WRITE)
#define BCMMBOX1_POLL (BCMMBOX1_BASE + BCMMBOX_POLL)
#define BCMMBOX1_ID (BCMMBOX1_BASE + BCMMBOX_ID)
#define BCMMBOX1_STATUS (BCMMBOX1_BASE + BCMMBOX_STATUS)
#define BCMMBOX1_CFG (BCMMBOX1_BASE + BCMMBOX_READ)
void bcmmbox_read(uint8_t chan, uint32_t *data);
void bcmmbox_write(uint8_t chan, uint32_t data);
int bcmmbox_post(uint8_t, void *, size_t, uint32_t *);
#endif /* BCM2835_MBOX_H */
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