1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
29  * Driver for simple syscon poweroff and reset devices. The device tree
32  * https://www.kernel.org/doc/Documentation/devicetree/bindings/power/reset/syscon-poweroff.txt
33  * https://www.kernel.org/doc/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48 #include <dev/ofw/openfirm.h>
51 #include "syscon.h"
54 	struct syscon		*regmap;
63 syscon_power_shutdown_final(device_t dev, int howto)  in syscon_power_shutdown_final()  argument
68 	sc = device_get_softc(dev);  in syscon_power_shutdown_final()
69 	if (sc->reboot)  in syscon_power_shutdown_final()
75 		SYSCON_MODIFY_4(sc->regmap, sc->offset, sc->mask,  in syscon_power_shutdown_final()
76 		    sc->value & sc->mask);  in syscon_power_shutdown_final()
80 syscon_power_probe(device_t dev)  in syscon_power_probe()  argument
83 	if (!ofw_bus_status_okay(dev))  in syscon_power_probe()
86 	if (ofw_bus_is_compatible(dev, "syscon-poweroff")) {  in syscon_power_probe()
87 		device_set_desc(dev, "Syscon poweroff");  in syscon_power_probe()
89 	} else if (ofw_bus_is_compatible(dev, "syscon-reboot")) {  in syscon_power_probe()
90 		device_set_desc(dev, "Syscon reboot");  in syscon_power_probe()
98 syscon_power_attach(device_t dev)  in syscon_power_attach()  argument
105 	sc = device_get_softc(dev);  in syscon_power_attach()
106 	node = ofw_bus_get_node(dev);  in syscon_power_attach()
109 		device_printf(dev, "could not find regmap\n");  in syscon_power_attach()
113 	error = syscon_get_by_ofw_property(dev, node, "regmap", &sc->regmap);  in syscon_power_attach()
115 		device_printf(dev, "could not get syscon\n");  in syscon_power_attach()
121 		device_printf(dev, "could not get offset\n");  in syscon_power_attach()
125 	OF_getencprop(node, "offset", &sc->offset, sizeof(sc->offset));  in syscon_power_attach()
132 			device_printf(dev, "cannot handle mask\n");  in syscon_power_attach()
136 		OF_getencprop(node, "mask", &sc->mask, sizeof(sc->mask));  in syscon_power_attach()
138 		sc->mask = 0xffffffff;  in syscon_power_attach()
149 			device_printf(dev, "must have a value or a mask\n");  in syscon_power_attach()
153 		sc->value = sc->mask;  in syscon_power_attach()
157 			device_printf(dev, "cannot handle value\n");  in syscon_power_attach()
161 		OF_getencprop(node, "value", &sc->value, sizeof(sc->value));  in syscon_power_attach()
165 	sc->reboot = ofw_bus_is_compatible(dev, "syscon-reboot");  in syscon_power_attach()
166 	sc->shutdown_tag = EVENTHANDLER_REGISTER(shutdown_final,  in syscon_power_attach()
167 	    syscon_power_shutdown_final, dev,  in syscon_power_attach()
168 	    sc->reboot ? SHUTDOWN_PRI_LAST + 150 : SHUTDOWN_PRI_LAST);  in syscon_power_attach()
174 syscon_power_detach(device_t dev)  in syscon_power_detach()  argument
178 	sc = device_get_softc(dev);  in syscon_power_detach()
179 	EVENTHANDLER_DEREGISTER(shutdown_final, sc->shutdown_tag);  in syscon_power_detach()