102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/* $OpenBSD: gpiorestart.c,v 1.1 2022/06/09 12:13:56 kettenis Exp $ */
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/*
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* Copyright (c) 2022 Mark Kettenis
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_gpio.h>
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#include <dev/ofw/fdt.h>
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extern void (*cpuresetfn)(void);
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struct gpiorestart_softc {
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struct device sc_dev;
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uint32_t *sc_gpio;
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uint32_t sc_active_delay;
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uint32_t sc_inactive_delay;
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uint32_t sc_wait_delay;
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};
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int gpiorestart_match(struct device *, void *, void *);
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void gpiorestart_attach(struct device *, struct device *, void *);
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const struct cfattach gpiorestart_ca = {
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sizeof(struct gpiorestart_softc), gpiorestart_match, gpiorestart_attach
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};
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struct cfdriver gpiorestart_cd = {
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NULL, "gpiorestart", DV_DULL
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};
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void gpiorestart_reset(void);
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int
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gpiorestart_match(struct device *parent, void *match, void *aux)
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{
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struct fdt_attach_args *faa = aux;
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return OF_is_compatible(faa->fa_node, "gpio-restart");
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}
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void
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gpiorestart_attach(struct device *parent, struct device *self, void *aux)
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{
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struct gpiorestart_softc *sc = (struct gpiorestart_softc *)self;
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struct fdt_attach_args *faa = aux;
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int len;
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len = OF_getproplen(faa->fa_node, "gpios");
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if (len <= 0) {
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printf(": no gpio\n");
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return;
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}
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sc->sc_gpio = malloc(len, M_DEVBUF, M_WAITOK);
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OF_getpropintarray(faa->fa_node, "gpios", sc->sc_gpio, len);
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sc->sc_active_delay =
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OF_getpropint(faa->fa_node, "active-delay", 100) * 1000;
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sc->sc_inactive_delay =
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OF_getpropint(faa->fa_node, "inactive-delay", 100) * 1000;
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sc->sc_wait_delay =
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OF_getpropint(faa->fa_node, "wait-delay", 3000) * 1000;
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if (cpuresetfn == NULL)
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cpuresetfn = gpiorestart_reset;
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printf("\n");
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}
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void
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gpiorestart_reset(void)
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{
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struct gpiorestart_softc *sc = gpiorestart_cd.cd_devs[0];
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gpio_controller_config_pin(sc->sc_gpio, GPIO_CONFIG_OUTPUT);
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gpio_controller_set_pin(sc->sc_gpio, 1);
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delay(sc->sc_active_delay);
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gpio_controller_set_pin(sc->sc_gpio, 0);
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delay(sc->sc_inactive_delay);
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gpio_controller_set_pin(sc->sc_gpio, 1);
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delay(sc->sc_wait_delay);
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}
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