1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
61 #define DWWDT_READ4(sc, reg) 		bus_read_4((sc)->sc_mem_res, (reg))
63 	bus_write_4((sc)->sc_mem_res, (reg), (val))
67  * (pre-restart delay)
88 	{ "snps,dw-wdt",		1 },
102     &dwwdt_debug_enabled, 0, "Enable debug mode");
139 	device_printf(dev, "Clock: %s\n", clk_get_name(sc->sc_clk));  in dwwdt_debug()
140 	device_printf(dev, "  FREQ: %lu\n", sc->sc_clk_freq);  in dwwdt_debug()
156 	/* Enable watchdog */  in dwwdt_start()
160 	sc->sc_status = DWWDT_RUNNING;  in dwwdt_start()
167 	sc->sc_status = DWWDT_STOPPED;  in dwwdt_stop()
187 	if (dwwdt_prevent_restart || sc->sc_status == DWWDT_STOPPED) {  in dwwdt_intr()
197 		panic("dwwdt pre-timeout interrupt");  in dwwdt_intr()
204 	const int exponent = flsl(sc->sc_clk_freq);  in dwwdt_event()
209 	val = MAX(0, timeout + exponent - DWWDT_EXP_OFFSET + 1);  in dwwdt_event()
225 		dwwdt_debug(sc->sc_dev);  in dwwdt_event()
234 	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)  in dwwdt_probe()
247 	sc->sc_dev = dev;  in dwwdt_attach()
249 	sc->sc_mem_rid = 0;  in dwwdt_attach()
250 	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,  in dwwdt_attach()
251 	    &sc->sc_mem_rid, RF_ACTIVE);  in dwwdt_attach()
252 	if (sc->sc_mem_res == NULL) {  in dwwdt_attach()
257 	sc->sc_irq_rid = 0;  in dwwdt_attach()
258 	sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,  in dwwdt_attach()
259 	    &sc->sc_irq_rid, RF_ACTIVE);  in dwwdt_attach()
260 	if (sc->sc_irq_res == NULL) {  in dwwdt_attach()
265 	sc->sc_intr_cookie = NULL;  in dwwdt_attach()
266 	if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,  in dwwdt_attach()
267 	    NULL, dwwdt_intr, sc, &sc->sc_intr_cookie) != 0) {  in dwwdt_attach()
272 	if (clk_get_by_ofw_index(dev, 0, 0, &sc->sc_clk) != 0) {  in dwwdt_attach()
277 	if (clk_enable(sc->sc_clk) != 0) {  in dwwdt_attach()
278 		device_printf(dev, "cannot enable clock\n");  in dwwdt_attach()
282 	if (clk_get_freq(sc->sc_clk, &sc->sc_clk_freq) != 0) {  in dwwdt_attach()
287 	if (sc->sc_clk_freq == 0UL)  in dwwdt_attach()
290 	sc->sc_evtag = EVENTHANDLER_REGISTER(watchdog_list, dwwdt_event, sc, 0);  in dwwdt_attach()
291 	sc->sc_status = DWWDT_STOPPED;  in dwwdt_attach()
297 	clk_release(sc->sc_clk);  in dwwdt_attach()
299 	bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr_cookie);  in dwwdt_attach()
301 	bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid, sc->sc_irq_res);  in dwwdt_attach()
303 	bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid,  in dwwdt_attach()
304 	    sc->sc_mem_res);  in dwwdt_attach()
317 		 * Once started it cannot be stopped. Prevent module unload  in dwwdt_detach()
327 	EVENTHANDLER_DEREGISTER(watchdog_list, sc->sc_evtag);  in dwwdt_detach()
328 	sc->sc_evtag = NULL;  in dwwdt_detach()
330 	if (sc->sc_clk != NULL)  in dwwdt_detach()
331 		clk_release(sc->sc_clk);  in dwwdt_detach()
333 	if (sc->sc_intr_cookie != NULL)  in dwwdt_detach()
334 		bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr_cookie);  in dwwdt_detach()
336 	if (sc->sc_irq_res) {  in dwwdt_detach()
337 		bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid,  in dwwdt_detach()
338 		    sc->sc_irq_res);  in dwwdt_detach()
341 	if (sc->sc_mem_res) {  in dwwdt_detach()
342 		bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid,  in dwwdt_detach()
343 		    sc->sc_mem_res);  in dwwdt_detach()