at91_twiio.h revision 155324 
1/*-
2 * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 *
24 * $FreeBSD: head/sys/arm/at91/at91_twiio.h 155324 2006-02-04 23:32:13Z imp $
25 */
26
27#ifndef _ARM_AT91_AT91_TWIIO_H
28#define _ARM_AT91_AT91_TWIIO_H
29
30#include <sys/ioccom.h>
31
32struct at91_twi_io
33{
34	int	dadr;			/* Device address */
35	int	type;			/* read/write */
36#define TWI_IO_READ_MASTER	1
37#define TWI_IO_WRITE_MASTER	2
38	int	iadrsz;			/* Internal addr size */
39	uint32_t iadr;			/* Interbak addr */
40	size_t  xfer_len;		/* Size to transfer */
41	caddr_t xfer_buf;		/* buffer for xfer */
42};
43
44struct at91_twi_clock
45{
46	int	ckdiv;			/* Clock divider */
47	int	high_rate;		/* rate of clock high period */
48	int	low_rate;		/* rate of clock low period */
49};
50
51/** TWIIOCXFER: Do a two-wire transfer
52 */
53#define TWIIOCXFER	_IOW('x', 1, struct at91_twi_io)
54
55/** TWIIOCSETCLOCK: Sets the clocking parameters for this operation.
56 */
57#define TWIIOCSETCLOCK _IOW('x', 2, struct at91_twi_clock)
58
59#endif /* !_ARM_AT91_AT91_TWIIO_H */
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