1/* $NetBSD$ */
2
3/*
4 *  Copyright (c) 2008, Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
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 AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/device.h>
35#include <sys/gpio.h>
36#include <sys/kernel.h>
37
38#include <dev/gpio/gpiovar.h>
39
40#include <dev/ppbus/ppbus_conf.h>
41#include <dev/ppbus/ppbus_base.h>
42#include <dev/ppbus/ppbus_io.h>
43
44static int  gpio_ppbus_open(void *, device_t);
45static void gpio_ppbus_close(void *, device_t);
46static int  gpio_ppbus_pin_read(void *, int);
47static void gpio_ppbus_pin_write(void *, int, int);
48static void gpio_ppbus_pin_ctl(void *, int, int);
49
50
51#define PORT(r, b, i) { PPBUS_R##r##TR, PPBUS_W##r##TR, b, i}
52static const struct {
53	u_char rreg;
54	u_char wreg;
55	u_char bit;
56	u_char inv;
57} ppbus_port[PPBUS_NPINS] = {	/* parallel port wiring: */
58	PORT(C, 0, 1),		/*     1: /C0  Output    */
59	PORT(D, 0, 0),		/*     2:  D0  Output    */
60	PORT(D, 1, 0),		/*     3:  D1  Output    */
61	PORT(D, 2, 0),		/*     4:  D2  Output    */
62	PORT(D, 3, 0),		/*     5:  D3  Output    */
63	PORT(D, 4, 0),		/*     6:  D4  Output    */
64	PORT(D, 5, 0),		/*     7:  D5  Output    */
65	PORT(D, 6, 0),		/*     8:  D6  Output    */
66	PORT(D, 7, 0),		/*     9:  D7  Output    */
67	PORT(S, 6, 0),		/*    10:  S6  Input     */
68	PORT(S, 7, 1),		/*    11: /S7  Input     */
69	PORT(S, 5, 0),		/*    12:  S5  Input     */
70	PORT(S, 4, 0),		/*    13:  S4  Input     */
71	PORT(C, 1, 1),		/*    14: /C1  Output    */
72	PORT(S, 3, 0),		/*    15:  S3  Input     */
73	PORT(C, 2, 0),		/*    16:  C2  Output    */
74	PORT(C, 3, 1),		/*    17: /C3  Output    */
75};				/* 18-25: GND            */
76
77void
78gpio_ppbus_attach(struct ppbus_softc *sc)
79{
80	struct gpiobus_attach_args gba;
81	gpio_pin_t *pin;
82	int i;
83
84	for (pin = &sc->sc_gpio_pins[0], i = 0; i < PPBUS_NPINS; pin++, i++) {
85		pin->pin_num = i;
86
87		if (((i >= 9) && (i <= 12)) || (i == 14)) {
88			pin->pin_caps = GPIO_PIN_INPUT;
89			pin->pin_flags = GPIO_PIN_INPUT;
90			pin->pin_state = gpio_ppbus_pin_read(sc, i);
91		} else {
92			pin->pin_caps = GPIO_PIN_OUTPUT;
93			pin->pin_flags = GPIO_PIN_OUTPUT;
94			pin->pin_state = GPIO_PIN_LOW;
95			gpio_ppbus_pin_write(sc, i, pin->pin_state);
96		}
97
98		gpio_ppbus_pin_ctl(sc, i, pin->pin_flags);
99	}
100
101	sc->sc_gpio_gc.gp_cookie = sc;
102	sc->sc_gpio_gc.gp_gc_open = gpio_ppbus_open;
103	sc->sc_gpio_gc.gp_gc_close = gpio_ppbus_close;
104	sc->sc_gpio_gc.gp_pin_read = gpio_ppbus_pin_read;
105	sc->sc_gpio_gc.gp_pin_write = gpio_ppbus_pin_write;
106	sc->sc_gpio_gc.gp_pin_ctl = gpio_ppbus_pin_ctl;
107
108	gba.gba_gc = &sc->sc_gpio_gc;
109	gba.gba_pins = sc->sc_gpio_pins;
110	gba.gba_npins = PPBUS_NPINS;
111
112	config_found_ia(sc->sc_dev, "gpiobus", &gba, gpiobus_print);
113}
114
115static int
116gpio_ppbus_open(void *arg, device_t dev)
117{
118	struct ppbus_softc *sc = arg;
119
120	return ppbus_request_bus(sc->sc_dev, dev, PPBUS_WAIT|PPBUS_INTR, (hz));
121}
122
123static void
124gpio_ppbus_close(void *arg, device_t dev)
125{
126	struct ppbus_softc *sc = arg;
127
128	(void) ppbus_release_bus(sc->sc_dev, dev, PPBUS_WAIT|PPBUS_INTR, (hz));
129}
130
131static int
132gpio_ppbus_pin_read(void *arg, int pin)
133{
134	struct ppbus_softc *sc = arg;
135	u_char port = ppbus_io(sc->sc_dev, ppbus_port[pin].rreg, NULL, 0, 0);
136
137	return ((port >> ppbus_port[pin].bit) & 1) ^ ppbus_port[pin].inv;
138}
139
140static void
141gpio_ppbus_pin_write(void *arg, int pin, int value)
142{
143	struct ppbus_softc *sc = arg;
144	u_char port = ppbus_io(sc->sc_dev, ppbus_port[pin].rreg, NULL, 0, 0);
145
146	value ^= ppbus_port[pin].inv;
147	value <<= ppbus_port[pin].bit;
148	port &= ~(1 << ppbus_port[pin].bit);
149	port |= value;
150
151	ppbus_io(sc->sc_dev, ppbus_port[pin].wreg, NULL, 0, port);
152}
153
154static void
155gpio_ppbus_pin_ctl(void *arg, int pin, int flags)
156{
157	/* can't change parallel port pin configuration */
158}
159