1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
73 	{"fsl,imx6sx-wdt", 1},
74 	{"fsl,imx6sl-wdt", 1},
75 	{"fsl,imx6q-wdt",  1},
76 	{"fsl,imx53-wdt",  1},
77 	{"fsl,imx51-wdt",  1},
78 	{"fsl,imx50-wdt",  1},
79 	{"fsl,imx35-wdt",  1},
80 	{"fsl,imx27-wdt",  1},
81 	{"fsl,imx25-wdt",  1},
82 	{"fsl,imx21-wdt",  1},
90 	return (bus_read_2(sc->sc_res[MEMRES], offs));  in RD2()
97 	bus_write_2(sc->sc_res[MEMRES], offs, val);  in WR2()
108 	mtx_lock(&sc->sc_mtx);  in imx_wdog_enable()
109 	if (timeout != sc->sc_timeout) {  in imx_wdog_enable()
110 		sc->sc_timeout = timeout;  in imx_wdog_enable()
113 		reg |= ((2 * timeout - 1) << WDOG_CR_WT_SHIFT);  in imx_wdog_enable()
119 	/* Watchdog active, can disable rom-boot watchdog. */  in imx_wdog_enable()
120 	if (sc->sc_pde_enabled) {  in imx_wdog_enable()
121 		sc->sc_pde_enabled = false;  in imx_wdog_enable()
125 	mtx_unlock(&sc->sc_mtx);  in imx_wdog_enable()
139 			device_printf(sc->sc_dev, "Can not be disabled.\n");  in imx_watchdog()
154 	 * When configured for external reset, the actual reset is supposed to  in imx_wdog_intr()
155 	 * happen when some external device responds to the assertion of the  in imx_wdog_intr()
156 	 * WDOG_B signal by asserting the POR signal to the chip.  This  in imx_wdog_intr()
158 	 * simultaneously with WDOG_B, and if the external reset happens we'll  in imx_wdog_intr()
160 	 * a software reset.  That code will see that external reset is  in imx_wdog_intr()
164 	imx_wdog_cpu_reset(BUS_SPACE_PHYSADDR(sc->sc_res[MEMRES], WDOG_CR_REG));  in imx_wdog_intr()
176 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)  in imx_wdog_probe()
190 	sc->sc_dev = dev;  in imx_wdog_attach()
192 	if (bus_alloc_resources(dev, imx_wdog_spec, sc->sc_res)) {  in imx_wdog_attach()
197 	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), "imx_wdt", MTX_DEF);  in imx_wdog_attach()
200 	 * If we're configured to assert an external reset signal, set up the  in imx_wdog_attach()
202 	 * purpose is to backstop the external reset.  Don't worry if the  in imx_wdog_attach()
205 	if (ofw_bus_has_prop(sc->sc_dev, "fsl,ext-reset-output")) {  in imx_wdog_attach()
207 		bus_setup_intr(sc->sc_dev, sc->sc_res[IRQRES],  in imx_wdog_attach()
209 		    &sc->sc_ih);  in imx_wdog_attach()
214 	 * Note whether the rom-boot so-called "power-down" watchdog is active,  in imx_wdog_attach()
218 		sc->sc_pde_enabled = true;  in imx_wdog_attach()
222 	/* If there is a timeout-sec property, activate the watchdog. */  in imx_wdog_attach()
223 	if (OF_getencprop(ofw_bus_get_node(sc->sc_dev), "timeout-sec",  in imx_wdog_attach()
226 			device_printf(sc->sc_dev, "ERROR: bad timeout-sec "  in imx_wdog_attach()
231 		device_printf(sc->sc_dev, "watchdog enabled using "  in imx_wdog_attach()
232 		    "timeout-sec property value %u\n", timeout);  in imx_wdog_attach()
240 	device_busy(sc->sc_dev);  in imx_wdog_attach()