1248557Sray/*- 2250357Sray * Copyright (c) 2012, 2013 The FreeBSD Foundation 3248557Sray * All rights reserved. 4248557Sray * 5248557Sray * This software was developed by Oleksandr Rybalko under sponsorship 6248557Sray * from the FreeBSD Foundation. 7248557Sray * 8248557Sray * Redistribution and use in source and binary forms, with or without 9248557Sray * modification, are permitted provided that the following conditions 10248557Sray * are met: 11248557Sray * 1. Redistributions of source code must retain the above copyright 12248557Sray * notice, this list of conditions and the following disclaimer. 13248557Sray * 2. Redistributions in binary form must reproduce the above copyright 14248557Sray * notice, this list of conditions and the following disclaimer in the 15248557Sray * documentation and/or other materials provided with the distribution. 16248557Sray * 17248557Sray * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18248557Sray * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19248557Sray * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20248557Sray * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21248557Sray * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22248557Sray * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23248557Sray * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24248557Sray * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25248557Sray * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26248557Sray * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27248557Sray * SUCH DAMAGE. 28248557Sray */ 29248557Sray 30248557Sray#include <sys/cdefs.h> 31248557Sray__FBSDID("$FreeBSD: releng/10.3/sys/arm/freescale/imx/imx_wdog.c 287079 2015-08-23 20:16:13Z ian $"); 32248557Sray 33248557Sray#include <sys/param.h> 34248557Sray#include <sys/systm.h> 35248557Sray#include <sys/kernel.h> 36248557Sray#include <sys/module.h> 37248557Sray#include <sys/time.h> 38248557Sray#include <sys/bus.h> 39248557Sray#include <sys/resource.h> 40248557Sray#include <sys/rman.h> 41248557Sray#include <sys/watchdog.h> 42248557Sray 43248557Sray#include <machine/bus.h> 44248557Sray#include <machine/intr.h> 45248557Sray 46248557Sray#include <dev/fdt/fdt_common.h> 47248557Sray#include <dev/ofw/openfirm.h> 48248557Sray#include <dev/ofw/ofw_bus.h> 49248557Sray#include <dev/ofw/ofw_bus_subr.h> 50248557Sray#include <machine/fdt.h> 51248557Sray 52248557Sray#include <arm/freescale/imx/imx_wdogreg.h> 53248557Sray 54248557Sraystruct imx_wdog_softc { 55248557Sray struct mtx sc_mtx; 56248557Sray device_t sc_dev; 57248557Sray bus_space_tag_t sc_bst; 58248557Sray bus_space_handle_t sc_bsh; 59248557Sray struct resource *sc_res[2]; 60248557Sray uint32_t sc_timeout; 61248557Sray}; 62248557Sray 63248557Sraystatic struct resource_spec imx_wdog_spec[] = { 64248557Sray { SYS_RES_MEMORY, 0, RF_ACTIVE }, 65248557Sray { SYS_RES_IRQ, 0, RF_ACTIVE }, 66248557Sray { -1, 0 } 67248557Sray}; 68248557Sray 69287079Sianstatic struct ofw_compat_data compat_data[] = { 70287079Sian {"fsl,imx6sx-wdt", 1}, 71287079Sian {"fsl,imx6sl-wdt", 1}, 72287079Sian {"fsl,imx6q-wdt", 1}, 73287079Sian {"fsl,imx53-wdt", 1}, 74287079Sian {"fsl,imx51-wdt", 1}, 75287079Sian {"fsl,imx50-wdt", 1}, 76287079Sian {"fsl,imx35-wdt", 1}, 77287079Sian {"fsl,imx27-wdt", 1}, 78287079Sian {"fsl,imx25-wdt", 1}, 79287079Sian {"fsl,imx21-wdt", 1}, 80287079Sian {NULL, 0} 81287079Sian}; 82287079Sian 83248557Sraystatic void imx_watchdog(void *, u_int, int *); 84248557Sraystatic int imx_wdog_probe(device_t); 85248557Sraystatic int imx_wdog_attach(device_t); 86248557Sray 87248557Sraystatic device_method_t imx_wdog_methods[] = { 88248557Sray DEVMETHOD(device_probe, imx_wdog_probe), 89248557Sray DEVMETHOD(device_attach, imx_wdog_attach), 90248557Sray DEVMETHOD_END 91248557Sray}; 92248557Sray 93248557Sraystatic driver_t imx_wdog_driver = { 94248557Sray "imx_wdog", 95248557Sray imx_wdog_methods, 96248557Sray sizeof(struct imx_wdog_softc), 97248557Sray}; 98248557Sraystatic devclass_t imx_wdog_devclass; 99248557SrayDRIVER_MODULE(imx_wdog, simplebus, imx_wdog_driver, imx_wdog_devclass, 0, 0); 100248557Sray 101287079Sian#define RD2(_sc, _r) \ 102287079Sian bus_space_read_2((_sc)->sc_bst, (_sc)->sc_bsh, (_r)) 103287079Sian#define WR2(_sc, _r, _v) \ 104287079Sian bus_space_write_2((_sc)->sc_bst, (_sc)->sc_bsh, (_r), (_v)) 105248557Sray 106248557Sraystatic void 107248557Srayimx_watchdog(void *arg, u_int cmd, int *error) 108248557Sray{ 109248557Sray struct imx_wdog_softc *sc; 110248557Sray uint16_t reg; 111287079Sian u_int timeout; 112248557Sray 113248557Sray sc = arg; 114248557Sray mtx_lock(&sc->sc_mtx); 115287079Sian if (cmd == 0) { 116287079Sian if (bootverbose) 117287079Sian device_printf(sc->sc_dev, "Can not be disabled.\n"); 118287079Sian *error = EOPNOTSUPP; 119287079Sian } else { 120287079Sian timeout = (u_int)((1ULL << (cmd & WD_INTERVAL)) / 1000000000U); 121287079Sian if (timeout > 1 && timeout < 128) { 122287079Sian if (timeout != sc->sc_timeout) { 123287079Sian sc->sc_timeout = timeout; 124287079Sian reg = RD2(sc, WDOG_CR_REG); 125287079Sian reg &= ~WDOG_CR_WT_MASK; 126287079Sian reg |= (timeout << (WDOG_CR_WT_SHIFT + 1)) & 127287079Sian WDOG_CR_WT_MASK; 128287079Sian WR2(sc, WDOG_CR_REG, reg | WDOG_CR_WDE); 129287079Sian } 130248557Sray /* Refresh counter */ 131287079Sian WR2(sc, WDOG_SR_REG, WDOG_SR_STEP1); 132287079Sian WR2(sc, WDOG_SR_REG, WDOG_SR_STEP2); 133248557Sray *error = 0; 134248557Sray } 135248557Sray } 136248557Sray mtx_unlock(&sc->sc_mtx); 137248557Sray} 138248557Sray 139248557Sraystatic int 140248557Srayimx_wdog_probe(device_t dev) 141248557Sray{ 142248557Sray 143266152Sian if (!ofw_bus_status_okay(dev)) 144266152Sian return (ENXIO); 145266152Sian 146287079Sian if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 147248557Sray return (ENXIO); 148248557Sray 149287079Sian device_set_desc(dev, "Freescale i.MX Watchdog"); 150248557Sray return (0); 151248557Sray} 152248557Sray 153248557Sraystatic int 154248557Srayimx_wdog_attach(device_t dev) 155248557Sray{ 156248557Sray struct imx_wdog_softc *sc; 157248557Sray 158248557Sray sc = device_get_softc(dev); 159248557Sray sc->sc_dev = dev; 160248557Sray 161248557Sray if (bus_alloc_resources(dev, imx_wdog_spec, sc->sc_res)) { 162248557Sray device_printf(dev, "could not allocate resources\n"); 163248557Sray return (ENXIO); 164248557Sray } 165248557Sray 166248557Sray mtx_init(&sc->sc_mtx, device_get_nameunit(dev), "imx_wdt", MTX_DEF); 167248557Sray 168248557Sray sc->sc_dev = dev; 169248557Sray sc->sc_bst = rman_get_bustag(sc->sc_res[0]); 170248557Sray sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]); 171248557Sray 172248557Sray /* TODO: handle interrupt */ 173248557Sray 174248557Sray EVENTHANDLER_REGISTER(watchdog_list, imx_watchdog, sc, 0); 175248557Sray return (0); 176248557Sray} 177