xref: /netbsd-src/sys/arch/arm/xscale/i80312_gpio.c (revision ed9977b1224ae46b1df090a9d378605dde53e47b)
1 /*	$NetBSD: i80312_gpio.c,v 1.4 2011/07/01 20:32:51 dyoung Exp $	*/
2 
3 /*
4  * Copyright (c) 2001 Wasabi Systems, Inc.
5  * All rights reserved.
6  *
7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *	This product includes software developed for the NetBSD Project by
20  *	Wasabi Systems, Inc.
21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22  *    or promote products derived from this software without specific prior
23  *    written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35  * POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 /*
39  * Intel i80312 Companion I/O general purpose I/O support.
40  */
41 
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: i80312_gpio.c,v 1.4 2011/07/01 20:32:51 dyoung Exp $");
44 
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 
48 #include <sys/bus.h>
49 
50 #include <arm/xscale/i80312reg.h>
51 #include <arm/xscale/i80312var.h>
52 
53 /*
54  * i80312_gpio_set_direction:
55  *
56  *	Set the direction of the indicated GPIO pins (1 == output).
57  */
58 void
i80312_gpio_set_direction(uint8_t which,uint8_t val)59 i80312_gpio_set_direction(uint8_t which, uint8_t val)
60 {
61 	struct i80312_softc *sc = i80312_softc;
62 
63 	sc->sc_gpio_dir = (sc->sc_gpio_dir & ~which) | val;
64 	bus_space_write_1(sc->sc_st, sc->sc_intc_sh, I80312_INTC_GOE,
65 	    ~sc->sc_gpio_dir);
66 }
67 
68 /*
69  * i80312_gpio_set_val:
70  *
71  *	Set the value of the indicated GPIO pins.
72  */
73 void
i80312_gpio_set_val(uint8_t which,uint8_t val)74 i80312_gpio_set_val(uint8_t which, uint8_t val)
75 {
76 	struct i80312_softc *sc = i80312_softc;
77 
78 	sc->sc_gpio_val = (sc->sc_gpio_val & ~which) | val;
79 	bus_space_write_1(sc->sc_st, sc->sc_intc_sh, I80312_INTC_GOD,
80 	    ~sc->sc_gpio_val);
81 }
82 
83 /*
84  * i80312_gpio_get_val:
85  *
86  *	Get the current state of the GPIO pins.
87  */
88 uint8_t
i80312_gpio_get_val(void)89 i80312_gpio_get_val(void)
90 {
91 	struct i80312_softc *sc = i80312_softc;
92 
93 	return (bus_space_read_1(sc->sc_st, sc->sc_intc_sh, I80312_INTC_GID));
94 }
95