bcm2835_vcbus.h revision 239922 
1/*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/arm/broadcom/bcm2835/bcm2835_vcbus.h 239922 2012-08-30 20:59:37Z gonzo $
27 */
28
29/*
30 * Defines for converting physical address to VideoCore bus address and back
31 */
32
33#ifndef _BCM2835_VCBUS_H_
34#define _BCM2835_VCBUS_H_
35
36#define	BCM2835_VCBUS_SDRAM_CACHED	0x40000000
37#define	BCM2835_VCBUS_SDRAM_UNCACHED	0xC0000000
38
39/*
40 * Convert physical address to VC bus address. Should be used
41 * when submitting address over mailbox interface
42 */
43#define	PHYS_TO_VCBUS(pa)	((pa) + BCM2835_VCBUS_SDRAM_CACHED)
44
45/*
46 * Convert address from VC bus space to physical. Should be used
47 * when address is returned by VC over mailbox interface. e.g.
48 * framebuffer base
49 */
50#define	VCBUS_TO_PHYS(vca)	((vca) - BCM2835_VCBUS_SDRAM_CACHED)
51
52#endif /* _BCM2835_VCBUS_H_ */
53