/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2009, Oleksandr Tymoshenko * Copyright (c) 2010-2011, Juli Mallett * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Watchdog driver for Cavium Octeon */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define DEFAULT_TIMER_VAL 65535 struct octeon_wdog_softc { device_t sc_dev; struct octeon_wdog_core_softc { int csc_core; struct resource *csc_intr; void *csc_intr_cookie; } sc_cores[MAXCPU]; int sc_armed; int sc_debug; }; extern void octeon_wdog_nmi_handler(void); void octeon_wdog_nmi(void); static void octeon_watchdog_arm_core(int); static void octeon_watchdog_disarm_core(int); static int octeon_wdog_attach(device_t); static void octeon_wdog_identify(driver_t *, device_t); static int octeon_wdog_intr(void *); static int octeon_wdog_probe(device_t); static void octeon_wdog_setup(struct octeon_wdog_softc *, int); static void octeon_wdog_sysctl(device_t); static void octeon_wdog_watchdog_fn(void *, u_int, int *); void octeon_wdog_nmi(void) { int core; core = cvmx_get_core_num(); printf("cpu%u: NMI detected\n", core); printf("cpu%u: Exception PC: %p\n", core, (void *)mips_rd_excpc()); printf("cpu%u: status %#x cause %#x\n", core, mips_rd_status(), mips_rd_cause()); /* * This is the end * Beautiful friend * * Just wait for Soft Reset to come and take us */ for (;;) continue; } static void octeon_watchdog_arm_core(int core) { cvmx_ciu_wdogx_t ciu_wdog; /* Poke it! */ cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1); /* * XXX * Perhaps if KDB is enabled, we should use mode=2 and drop into the * debugger on NMI? * * XXX * Timer should be calculated based on CPU frquency */ ciu_wdog.u64 = 0; ciu_wdog.s.len = DEFAULT_TIMER_VAL; ciu_wdog.s.mode = 3; cvmx_write_csr(CVMX_CIU_WDOGX(core), ciu_wdog.u64); } static void octeon_watchdog_disarm_core(int core) { cvmx_write_csr(CVMX_CIU_WDOGX(core), 0); } static void octeon_wdog_watchdog_fn(void *private, u_int cmd, int *error) { struct octeon_wdog_softc *sc = private; int core; cmd &= WD_INTERVAL; if (sc->sc_debug) device_printf(sc->sc_dev, "%s: cmd: %x\n", __func__, cmd); if (cmd > 0) { CPU_FOREACH(core) octeon_watchdog_arm_core(core); sc->sc_armed = 1; *error = 0; } else { if (sc->sc_armed) { CPU_FOREACH(core) octeon_watchdog_disarm_core(core); sc->sc_armed = 0; } } } static void octeon_wdog_sysctl(device_t dev) { struct octeon_wdog_softc *sc = device_get_softc(dev); struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev); struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev); SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "debug", CTLFLAG_RW, &sc->sc_debug, 0, "enable watchdog debugging"); SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "armed", CTLFLAG_RD, &sc->sc_armed, 0, "whether the watchdog is armed"); } static void octeon_wdog_setup(struct octeon_wdog_softc *sc, int core) { struct octeon_wdog_core_softc *csc; int rid, error; csc = &sc->sc_cores[core]; csc->csc_core = core; /* Interrupt part */ rid = 0; csc->csc_intr = bus_alloc_resource(sc->sc_dev, SYS_RES_IRQ, &rid, OCTEON_IRQ_WDOG0 + core, OCTEON_IRQ_WDOG0 + core, 1, RF_ACTIVE); if (csc->csc_intr == NULL) panic("%s: bus_alloc_resource for core %u failed", __func__, core); error = bus_setup_intr(sc->sc_dev, csc->csc_intr, INTR_TYPE_MISC, octeon_wdog_intr, NULL, csc, &csc->csc_intr_cookie); if (error != 0) panic("%s: bus_setup_intr for core %u: %d", __func__, core, error); bus_bind_intr(sc->sc_dev, csc->csc_intr, core); bus_describe_intr(sc->sc_dev, csc->csc_intr, csc->csc_intr_cookie, "cpu%u", core); if (sc->sc_armed) { /* Armed by default. */ octeon_watchdog_arm_core(core); } else { /* Disarmed by default. */ octeon_watchdog_disarm_core(core); } } static int octeon_wdog_intr(void *arg) { struct octeon_wdog_core_softc *csc = arg; KASSERT(csc->csc_core == cvmx_get_core_num(), ("got watchdog interrupt for core %u on core %u.", csc->csc_core, cvmx_get_core_num())); (void)csc; /* Poke it! */ cvmx_write_csr(CVMX_CIU_PP_POKEX(cvmx_get_core_num()), 1); return (FILTER_HANDLED); } static int octeon_wdog_probe(device_t dev) { device_set_desc(dev, "Cavium Octeon watchdog timer"); return (0); } static int octeon_wdog_attach(device_t dev) { struct octeon_wdog_softc *sc = device_get_softc(dev); uint64_t *nmi_handler = (uint64_t*)octeon_wdog_nmi_handler; int core, i; /* Initialise */ sc->sc_armed = 0; /* XXX Ought to be a tunable / config option. */ sc->sc_debug = 0; sc->sc_dev = dev; EVENTHANDLER_REGISTER(watchdog_list, octeon_wdog_watchdog_fn, sc, 0); octeon_wdog_sysctl(dev); for (i = 0; i < 16; i++) { cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, i * 8); cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, nmi_handler[i]); } cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0x81fc0000); CPU_FOREACH(core) octeon_wdog_setup(sc, core); return (0); } static void octeon_wdog_identify(driver_t *drv, device_t parent) { BUS_ADD_CHILD(parent, 0, "owdog", 0); } static device_method_t octeon_wdog_methods[] = { DEVMETHOD(device_identify, octeon_wdog_identify), DEVMETHOD(device_probe, octeon_wdog_probe), DEVMETHOD(device_attach, octeon_wdog_attach), {0, 0}, }; static driver_t octeon_wdog_driver = { "owdog", octeon_wdog_methods, sizeof(struct octeon_wdog_softc), }; static devclass_t octeon_wdog_devclass; DRIVER_MODULE(owdog, ciu, octeon_wdog_driver, octeon_wdog_devclass, 0, 0);