gpio.c revision 1.1 
1/* $NetBSD: gpio.c,v 1.1 2025/11/16 20:11:47 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2025 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <lib/libsa/stand.h>
30
31#include <machine/pio.h>
32
33#include "gpio.h"
34
35#define	HW_BASE		0x0d800000
36#define HW_GPIOB_OUT	(HW_BASE + 0x0c0)
37#define HW_GPIOB_IN	(HW_BASE + 0x0c8)
38
39void
40gpio_set(int pin)
41{
42	out32(HW_GPIOB_OUT, in32(HW_GPIOB_OUT) | __BIT(pin));
43}
44
45void
46gpio_clear(int pin)
47{
48	out32(HW_GPIOB_OUT, in32(HW_GPIOB_OUT) & ~__BIT(pin));
49}
50
51int
52gpio_get(int pin)
53{
54	return (in32(HW_GPIOB_IN) >> pin) & 1;
55}
56