IABSD.fr/src/sys/dev/fdt/syscon.c

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• Author : kettenis
  Date : 2018-03-17 18:04:15
  Hash : c4620c40
  Message : If we are compatible with "simple-mfd", attempt to attach child nodes. ok visa@

• sys/dev/fdt/syscon.c

• /*	$OpenBSD: syscon.c,v 1.4 2018/03/17 18:04:15 kettenis Exp $	*/
  /*
   * Copyright (c) 2017 Mark Kettenis
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/device.h>
  
  #include <machine/bus.h>
  #include <machine/fdt.h>
  
  #include <dev/ofw/openfirm.h>
  #include <dev/ofw/ofw_misc.h>
  #include <dev/ofw/fdt.h>
  
  #ifdef __armv7__
  #include <arm/simplebus/simplebusvar.h>
  #else
  #include <arm64/dev/simplebusvar.h>
  #endif
  
  extern void (*cpuresetfn)(void);
  extern void (*powerdownfn)(void);
  
  struct syscon_softc {
  	struct simplebus_softc	sc_sbus;
  	bus_space_tag_t		sc_iot;
  	bus_space_handle_t	sc_ioh;
  	uint32_t		sc_regmap;
  	bus_size_t		sc_offset;
  	uint32_t		sc_mask;
  };
  
  struct syscon_softc *syscon_reboot_sc;
  struct syscon_softc *syscon_poweroff_sc;
  
  int	syscon_match(struct device *, void *, void *);
  void	syscon_attach(struct device *, struct device *, void *);
  
  struct cfattach syscon_ca = {
  	sizeof(struct syscon_softc), syscon_match, syscon_attach
  };
  
  struct cfdriver syscon_cd = {
  	NULL, "syscon", DV_DULL
  };
  
  void	syscon_reset(void);
  void	syscon_powerdown(void);
  
  int
  syscon_match(struct device *parent, void *match, void *aux)
  {
  	struct fdt_attach_args *faa = aux;
  
  	return OF_is_compatible(faa->fa_node, "syscon") ||
  	    OF_is_compatible(faa->fa_node, "syscon-reboot") ||
  	    OF_is_compatible(faa->fa_node, "syscon-poweroff");
  }
  
  void
  syscon_attach(struct device *parent, struct device *self, void *aux)
  {
  	struct syscon_softc *sc = (struct syscon_softc *)self;
  	struct fdt_attach_args *faa = aux;
  	char name[32];
  
  	OF_getprop(faa->fa_node, "name", name, sizeof(name));
  	name[sizeof(name) - 1] = 0;
  
  	if (OF_is_compatible(faa->fa_node, "syscon")) {
  		if (faa->fa_nreg < 1) {
  			printf(": no registers\n");
  			return;
  		}
  
  		sc->sc_iot = faa->fa_iot;
  
  		if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
  		    faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
  			printf(": can't map registers\n");
  			return;
  		}
  
  		regmap_register(faa->fa_node, sc->sc_iot, sc->sc_ioh,
  		    faa->fa_reg[0].size);
  	}
  
  	if (OF_is_compatible(faa->fa_node, "simple-mfd"))
  		simplebus_attach(parent, &sc->sc_sbus.sc_dev, faa);
  	else
  		printf(": \"%s\"\n", name);
  
  	if (OF_is_compatible(faa->fa_node, "syscon-reboot") ||
  	    OF_is_compatible(faa->fa_node, "syscon-poweroff")) {
  		sc->sc_regmap = OF_getpropint(faa->fa_node, "regmap", 0);
  		if (sc->sc_regmap == 0)
  			return;
  
  		if (OF_getproplen(faa->fa_node, "offset") != sizeof(uint32_t) ||
  		    OF_getproplen(faa->fa_node, "mask") != sizeof(uint32_t))
  			return;
  
  		sc->sc_offset = OF_getpropint(faa->fa_node, "offset", 0);
  		sc->sc_mask = OF_getpropint(faa->fa_node, "mask", 0);
  
  		if (OF_is_compatible(faa->fa_node, "syscon-reboot")) {
  			syscon_reboot_sc = sc;
  			cpuresetfn = syscon_reset;
  		} else if (OF_is_compatible(faa->fa_node, "syscon-poweroff")) {
  			syscon_poweroff_sc = sc;
  			powerdownfn = syscon_powerdown;
  		}
  	}
  }
  
  void
  syscon_reset(void)
  {
  	struct syscon_softc *sc = syscon_reboot_sc;
  	struct regmap *rm;
  
  	rm = regmap_byphandle(sc->sc_regmap);
  	if (rm == NULL)
  		return;
  
  	regmap_write_4(rm, sc->sc_offset, sc->sc_mask);
  	delay(1000000);
  }
  
  void
  syscon_powerdown(void)
  {
  	struct syscon_softc *sc = syscon_poweroff_sc;
  	struct regmap *rm;
  
  	rm = regmap_byphandle(sc->sc_regmap);
  	if (rm == NULL)
  		return;
  
  	regmap_write_4(rm, sc->sc_offset, sc->sc_mask);
  	delay(1000000);
  }