1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
30  * This is a generic syscon driver, whose purpose is to provide access to
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/bus.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/module.h>
42 #include <sys/mutex.h>
43 #include <sys/rman.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,
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()
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()
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()
180 	sc->syscon = syscon_create_ofw_node(dev, &syscon_generic_class,  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()
187 	if (ofw_bus_is_compatible(dev, "simple-bus")) {  in syscon_generic_attach()
188 		rv = simplebus_attach_impl(sc->dev);  in syscon_generic_attach()
194 		sc->simplebus_attached = true;  in syscon_generic_attach()
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()
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()