1*deb4602fSkettenis /* $OpenBSD: gpiorestart.c,v 1.1 2022/06/09 12:13:56 kettenis Exp $ */
2*deb4602fSkettenis /*
3*deb4602fSkettenis * Copyright (c) 2022 Mark Kettenis
4*deb4602fSkettenis *
5*deb4602fSkettenis * Permission to use, copy, modify, and distribute this software for any
6*deb4602fSkettenis * purpose with or without fee is hereby granted, provided that the above
7*deb4602fSkettenis * copyright notice and this permission notice appear in all copies.
8*deb4602fSkettenis *
9*deb4602fSkettenis * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10*deb4602fSkettenis * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11*deb4602fSkettenis * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12*deb4602fSkettenis * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13*deb4602fSkettenis * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14*deb4602fSkettenis * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15*deb4602fSkettenis * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16*deb4602fSkettenis */
17*deb4602fSkettenis
18*deb4602fSkettenis #include <sys/param.h>
19*deb4602fSkettenis #include <sys/systm.h>
20*deb4602fSkettenis #include <sys/device.h>
21*deb4602fSkettenis #include <sys/malloc.h>
22*deb4602fSkettenis
23*deb4602fSkettenis #include <machine/bus.h>
24*deb4602fSkettenis #include <machine/fdt.h>
25*deb4602fSkettenis
26*deb4602fSkettenis #include <dev/ofw/openfirm.h>
27*deb4602fSkettenis #include <dev/ofw/ofw_gpio.h>
28*deb4602fSkettenis #include <dev/ofw/fdt.h>
29*deb4602fSkettenis
30*deb4602fSkettenis extern void (*cpuresetfn)(void);
31*deb4602fSkettenis
32*deb4602fSkettenis struct gpiorestart_softc {
33*deb4602fSkettenis struct device sc_dev;
34*deb4602fSkettenis uint32_t *sc_gpio;
35*deb4602fSkettenis uint32_t sc_active_delay;
36*deb4602fSkettenis uint32_t sc_inactive_delay;
37*deb4602fSkettenis uint32_t sc_wait_delay;
38*deb4602fSkettenis };
39*deb4602fSkettenis
40*deb4602fSkettenis int gpiorestart_match(struct device *, void *, void *);
41*deb4602fSkettenis void gpiorestart_attach(struct device *, struct device *, void *);
42*deb4602fSkettenis
43*deb4602fSkettenis const struct cfattach gpiorestart_ca = {
44*deb4602fSkettenis sizeof(struct gpiorestart_softc), gpiorestart_match, gpiorestart_attach
45*deb4602fSkettenis };
46*deb4602fSkettenis
47*deb4602fSkettenis struct cfdriver gpiorestart_cd = {
48*deb4602fSkettenis NULL, "gpiorestart", DV_DULL
49*deb4602fSkettenis };
50*deb4602fSkettenis
51*deb4602fSkettenis void gpiorestart_reset(void);
52*deb4602fSkettenis
53*deb4602fSkettenis int
gpiorestart_match(struct device * parent,void * match,void * aux)54*deb4602fSkettenis gpiorestart_match(struct device *parent, void *match, void *aux)
55*deb4602fSkettenis {
56*deb4602fSkettenis struct fdt_attach_args *faa = aux;
57*deb4602fSkettenis
58*deb4602fSkettenis return OF_is_compatible(faa->fa_node, "gpio-restart");
59*deb4602fSkettenis }
60*deb4602fSkettenis
61*deb4602fSkettenis void
gpiorestart_attach(struct device * parent,struct device * self,void * aux)62*deb4602fSkettenis gpiorestart_attach(struct device *parent, struct device *self, void *aux)
63*deb4602fSkettenis {
64*deb4602fSkettenis struct gpiorestart_softc *sc = (struct gpiorestart_softc *)self;
65*deb4602fSkettenis struct fdt_attach_args *faa = aux;
66*deb4602fSkettenis int len;
67*deb4602fSkettenis
68*deb4602fSkettenis len = OF_getproplen(faa->fa_node, "gpios");
69*deb4602fSkettenis if (len <= 0) {
70*deb4602fSkettenis printf(": no gpio\n");
71*deb4602fSkettenis return;
72*deb4602fSkettenis }
73*deb4602fSkettenis
74*deb4602fSkettenis sc->sc_gpio = malloc(len, M_DEVBUF, M_WAITOK);
75*deb4602fSkettenis OF_getpropintarray(faa->fa_node, "gpios", sc->sc_gpio, len);
76*deb4602fSkettenis
77*deb4602fSkettenis sc->sc_active_delay =
78*deb4602fSkettenis OF_getpropint(faa->fa_node, "active-delay", 100) * 1000;
79*deb4602fSkettenis sc->sc_inactive_delay =
80*deb4602fSkettenis OF_getpropint(faa->fa_node, "inactive-delay", 100) * 1000;
81*deb4602fSkettenis sc->sc_wait_delay =
82*deb4602fSkettenis OF_getpropint(faa->fa_node, "wait-delay", 3000) * 1000;
83*deb4602fSkettenis
84*deb4602fSkettenis if (cpuresetfn == NULL)
85*deb4602fSkettenis cpuresetfn = gpiorestart_reset;
86*deb4602fSkettenis
87*deb4602fSkettenis printf("\n");
88*deb4602fSkettenis }
89*deb4602fSkettenis
90*deb4602fSkettenis void
gpiorestart_reset(void)91*deb4602fSkettenis gpiorestart_reset(void)
92*deb4602fSkettenis {
93*deb4602fSkettenis struct gpiorestart_softc *sc = gpiorestart_cd.cd_devs[0];
94*deb4602fSkettenis
95*deb4602fSkettenis gpio_controller_config_pin(sc->sc_gpio, GPIO_CONFIG_OUTPUT);
96*deb4602fSkettenis gpio_controller_set_pin(sc->sc_gpio, 1);
97*deb4602fSkettenis delay(sc->sc_active_delay);
98*deb4602fSkettenis gpio_controller_set_pin(sc->sc_gpio, 0);
99*deb4602fSkettenis delay(sc->sc_inactive_delay);
100*deb4602fSkettenis gpio_controller_set_pin(sc->sc_gpio, 1);
101*deb4602fSkettenis delay(sc->sc_wait_delay);
102*deb4602fSkettenis }
103