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      1 /*	$NetBSD: bcm2835_mbox.h,v 1.6 2019/12/30 18:43:38 jmcneill Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _BCM2835_MBOX_H_
     33 #define	_BCM2835_MBOX_H_
     34 
     35 #include <sys/bus.h>
     36 
     37 #define	BCM2835_MBOX_NUMCHANNELS 16
     38 #define	BCM2835_MBOX_CHANMASK    0xf
     39 
     40 #define	BCM2835_MBOX_CHAN(chan) ((chan) & BCM2835_MBOX_CHANMASK)
     41 #define	BCM2835_MBOX_DATA(data) ((data) & ~BCM2835_MBOX_CHANMASK)
     42 
     43 #define	BCM2835_MBOX_MSG(chan, data) \
     44     (BCM2835_MBOX_CHAN(chan) | BCM2835_MBOX_DATA(data))
     45 
     46 struct bcm2835mbox_softc {
     47 	device_t sc_dev;
     48 	device_t sc_platdev;
     49 
     50 	bus_space_tag_t sc_iot;
     51 	bus_space_handle_t sc_ioh;
     52 	bus_dma_tag_t sc_dmat;
     53 	void *sc_intrh;
     54 
     55 	kmutex_t sc_lock;
     56 	kmutex_t sc_intr_lock;
     57 	kcondvar_t sc_chan[BCM2835_MBOX_NUMCHANNELS];
     58 	uint32_t sc_mbox[BCM2835_MBOX_NUMCHANNELS];
     59 };
     60 
     61 void bcm2835_mbox_read(bus_space_tag_t, bus_space_handle_t, uint8_t,
     62     uint32_t *);
     63 void bcm2835_mbox_write(bus_space_tag_t, bus_space_handle_t, uint8_t,
     64     uint32_t);
     65 
     66 void bcmmbox_attach(struct bcm2835mbox_softc *);
     67 int bcmmbox_intr(void *);
     68 void bcmmbox_read(uint8_t, uint32_t *);
     69 void bcmmbox_write(uint8_t, uint32_t);
     70 
     71 int bcmmbox_request(uint8_t, void *, size_t, uint32_t *);
     72 
     73 struct bcmmbox_attach_args {
     74 	bus_dma_tag_t	baa_dmat;
     75 };
     76 
     77 #endif /* _BCM2835_MBOX_H_ */
     78