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      1 /* $NetBSD: fdt_power.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca>
      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 ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * 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: fdt_power.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 #include <sys/queue.h>
     36 
     37 #include <libfdt.h>
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 struct fdtbus_power_controller {
     41 	device_t power_dev;
     42 	int power_phandle;
     43 	const struct fdtbus_power_controller_func *power_funcs;
     44 
     45 	LIST_ENTRY(fdtbus_power_controller) power_next;
     46 };
     47 
     48 static LIST_HEAD(, fdtbus_power_controller) fdtbus_power_controllers =
     49     LIST_HEAD_INITIALIZER(fdtbus_power_controllers);
     50 
     51 int
     52 fdtbus_register_power_controller(device_t dev, int phandle,
     53     const struct fdtbus_power_controller_func *funcs)
     54 {
     55 	struct fdtbus_power_controller *power;
     56 
     57 	power = kmem_alloc(sizeof(*power), KM_SLEEP);
     58 	power->power_dev = dev;
     59 	power->power_phandle = phandle;
     60 	power->power_funcs = funcs;
     61 
     62 	LIST_INSERT_HEAD(&fdtbus_power_controllers, power, power_next);
     63 
     64 	return 0;
     65 }
     66 
     67 void
     68 fdtbus_power_reset(void)
     69 {
     70 	struct fdtbus_power_controller *power;
     71 
     72 	LIST_FOREACH(power, &fdtbus_power_controllers, power_next) {
     73 		if (power->power_funcs->reset)
     74 			power->power_funcs->reset(power->power_dev);
     75 	}
     76 }
     77 
     78 void
     79 fdtbus_power_poweroff(void)
     80 {
     81 	struct fdtbus_power_controller *power;
     82 
     83 	LIST_FOREACH(power, &fdtbus_power_controllers, power_next) {
     84 		if (power->power_funcs->poweroff)
     85 			power->power_funcs->poweroff(power->power_dev);
     86 	}
     87 }
     88