1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
30  * This is a generic syscon driver, whose purpose is to provide access to
47 #include <dev/ofw/ofw_bus.h>
48 #include <dev/ofw/ofw_bus_subr.h>
51 #include "syscon.h"
56 static uint32_t syscon_generic_unlocked_read_4(struct syscon *syscon,
58 static int syscon_generic_unlocked_write_4(struct syscon *syscon,
60 static int syscon_generic_unlocked_modify_4(struct syscon *syscon,
62 static int syscon_generic_detach(device_t dev);
64  * Generic syscon driver (FDT)
67 	{"syscon",	1},
71 #define SYSCON_LOCK(_sc)		mtx_lock_spin(&(_sc)->mtx)
72 #define	SYSCON_UNLOCK(_sc)		mtx_unlock_spin(&(_sc)->mtx)
73 #define SYSCON_LOCK_INIT(_sc)		mtx_init(&(_sc)->mtx,		\
74 	    device_get_nameunit((_sc)->dev), "syscon", MTX_SPIN)
75 #define SYSCON_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->mtx);
76 #define SYSCON_ASSERT_LOCKED(_sc)	mtx_assert(&(_sc)->mtx, MA_OWNED);
77 #define SYSCON_ASSERT_UNLOCKED(_sc)	mtx_assert(&(_sc)->mtx, MA_NOTOWNED);
90 syscon_generic_unlocked_read_4(struct syscon *syscon, bus_size_t offset)  in syscon_generic_unlocked_read_4()  argument
95 	sc = device_get_softc(syscon->pdev);  in syscon_generic_unlocked_read_4()
97 	val = bus_read_4(sc->mem_res, offset);  in syscon_generic_unlocked_read_4()
102 syscon_generic_unlocked_write_4(struct syscon *syscon, bus_size_t offset, uint32_t val)  in syscon_generic_unlocked_write_4()  argument
106 	sc = device_get_softc(syscon->pdev);  in syscon_generic_unlocked_write_4()
108 	bus_write_4(sc->mem_res, offset, val);  in syscon_generic_unlocked_write_4()
113 syscon_generic_unlocked_modify_4(struct syscon *syscon, bus_size_t offset,  in syscon_generic_unlocked_modify_4()  argument
119 	sc = device_get_softc(syscon->pdev);  in syscon_generic_unlocked_modify_4()
121 	val = bus_read_4(sc->mem_res, offset);  in syscon_generic_unlocked_modify_4()
124 	bus_write_4(sc->mem_res, offset, val);  in syscon_generic_unlocked_modify_4()
129 syscon_generic_lock(device_t dev)  in syscon_generic_lock()  argument
133 	sc = device_get_softc(dev);  in syscon_generic_lock()
138 syscon_generic_unlock(device_t dev)  in syscon_generic_unlock()  argument
142 	sc = device_get_softc(dev);  in syscon_generic_unlock()
147 syscon_generic_probe(device_t dev)  in syscon_generic_probe()  argument
150 	if (!ofw_bus_status_okay(dev))  in syscon_generic_probe()
152 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)  in syscon_generic_probe()
155 	device_set_desc(dev, "syscon");  in syscon_generic_probe()
157 		device_quiet(dev);  in syscon_generic_probe()
163 syscon_generic_attach(device_t dev)  in syscon_generic_attach()  argument
168 	sc = device_get_softc(dev);  in syscon_generic_attach()
169 	sc->dev = dev;  in syscon_generic_attach()
172 	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,  in syscon_generic_attach()
174 	if (sc->mem_res == NULL) {  in syscon_generic_attach()
175 		device_printf(dev, "Cannot allocate memory resource\n");  in syscon_generic_attach()
180 	sc->syscon = syscon_create_ofw_node(dev, &syscon_generic_class,  in syscon_generic_attach()
181 		ofw_bus_get_node(dev));  in syscon_generic_attach()
182 	if (sc->syscon == NULL) {  in syscon_generic_attach()
183 		device_printf(dev, "Failed to create/register syscon\n");  in syscon_generic_attach()
184 		syscon_generic_detach(dev);  in syscon_generic_attach()
187 	if (ofw_bus_is_compatible(dev, "simple-bus")) {  in syscon_generic_attach()
188 		rv = simplebus_attach_impl(sc->dev);  in syscon_generic_attach()
190 			device_printf(dev, "Failed to create simplebus\n");  in syscon_generic_attach()
191 			syscon_generic_detach(dev);  in syscon_generic_attach()
194 		sc->simplebus_attached = true;  in syscon_generic_attach()
197 	bus_attach_children(dev);  in syscon_generic_attach()
202 syscon_generic_detach(device_t dev)  in syscon_generic_detach()  argument
206 	sc = device_get_softc(dev);  in syscon_generic_detach()
207 	if (sc->syscon != NULL) {  in syscon_generic_detach()
208 		syscon_unregister(sc->syscon);  in syscon_generic_detach()
209 		free(sc->syscon, M_SYSCON);  in syscon_generic_detach()
211 	if (sc->simplebus_attached)  in syscon_generic_detach()
212 		simplebus_detach(dev);  in syscon_generic_detach()
215 	if (sc->mem_res != NULL)  in syscon_generic_detach()
216 		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);  in syscon_generic_detach()