The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/cavium/octeon_wdog.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
    5  * Copyright (c) 2010-2011, Juli Mallett <jmallett@FreeBSD.org>
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 /*
   32  * Watchdog driver for Cavium Octeon
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/watchdog.h>
   41 #include <sys/bus.h>
   42 #include <sys/eventhandler.h>
   43 #include <sys/kernel.h>
   44 #include <sys/module.h>
   45 #include <sys/sysctl.h>
   46 #include <sys/rman.h>
   47 #include <sys/smp.h>
   48 
   49 #include <contrib/octeon-sdk/cvmx.h>
   50 #include <mips/cavium/octeon_irq.h>
   51 
   52 #define DEFAULT_TIMER_VAL       65535
   53 
   54 struct octeon_wdog_softc {
   55         device_t sc_dev;
   56         struct octeon_wdog_core_softc {
   57                 int csc_core;
   58                 struct resource *csc_intr;
   59                 void *csc_intr_cookie;
   60         } sc_cores[MAXCPU];
   61         int sc_armed;
   62         int sc_debug;
   63 };
   64 
   65 extern void octeon_wdog_nmi_handler(void);
   66 void octeon_wdog_nmi(void);
   67 
   68 static void octeon_watchdog_arm_core(int);
   69 static void octeon_watchdog_disarm_core(int);
   70 static int octeon_wdog_attach(device_t);
   71 static void octeon_wdog_identify(driver_t *, device_t);
   72 static int octeon_wdog_intr(void *);
   73 static int octeon_wdog_probe(device_t);
   74 static void octeon_wdog_setup(struct octeon_wdog_softc *, int);
   75 static void octeon_wdog_sysctl(device_t);
   76 static void octeon_wdog_watchdog_fn(void *, u_int, int *);
   77 
   78 void
   79 octeon_wdog_nmi(void)
   80 {
   81         int core;
   82 
   83         core = cvmx_get_core_num();
   84 
   85         printf("cpu%u: NMI detected\n", core);
   86         printf("cpu%u: Exception PC: %p\n", core, (void *)mips_rd_excpc());
   87         printf("cpu%u: status %#x cause %#x\n", core, mips_rd_status(), mips_rd_cause());
   88 
   89         /*
   90          * This is the end
   91          * Beautiful friend
   92          *
   93          * Just wait for Soft Reset to come and take us
   94          */
   95         for (;;)
   96                 continue;
   97 }
   98 
   99 static void
  100 octeon_watchdog_arm_core(int core)
  101 {
  102         cvmx_ciu_wdogx_t ciu_wdog;
  103 
  104         /* Poke it! */
  105         cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1);
  106 
  107         /*
  108          * XXX
  109          * Perhaps if KDB is enabled, we should use mode=2 and drop into the
  110          * debugger on NMI?
  111          *
  112          * XXX
  113          * Timer should be calculated based on CPU frquency
  114          */
  115         ciu_wdog.u64 = 0;
  116         ciu_wdog.s.len = DEFAULT_TIMER_VAL;
  117         ciu_wdog.s.mode = 3;
  118         cvmx_write_csr(CVMX_CIU_WDOGX(core), ciu_wdog.u64);
  119 }
  120 
  121 static void
  122 octeon_watchdog_disarm_core(int core)
  123 {
  124 
  125         cvmx_write_csr(CVMX_CIU_WDOGX(core), 0);
  126 }
  127 
  128 static void
  129 octeon_wdog_watchdog_fn(void *private, u_int cmd, int *error)
  130 {
  131         struct octeon_wdog_softc *sc = private;
  132         int core;
  133 
  134         cmd &= WD_INTERVAL;
  135         if (sc->sc_debug)
  136                 device_printf(sc->sc_dev, "%s: cmd: %x\n", __func__, cmd);
  137         if (cmd > 0) {
  138                 CPU_FOREACH(core)
  139                         octeon_watchdog_arm_core(core);
  140                 sc->sc_armed = 1;
  141                 *error = 0;
  142         } else {
  143                 if (sc->sc_armed) {
  144                         CPU_FOREACH(core)
  145                                 octeon_watchdog_disarm_core(core);
  146                         sc->sc_armed = 0;
  147                 }
  148         }
  149 }
  150 
  151 static void
  152 octeon_wdog_sysctl(device_t dev)
  153 {
  154         struct octeon_wdog_softc *sc = device_get_softc(dev);
  155 
  156         struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev);
  157         struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev);
  158 
  159         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
  160                 "debug", CTLFLAG_RW, &sc->sc_debug, 0,
  161                 "enable watchdog debugging");
  162         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
  163                 "armed", CTLFLAG_RD, &sc->sc_armed, 0,
  164                 "whether the watchdog is armed");
  165 }
  166 
  167 static void
  168 octeon_wdog_setup(struct octeon_wdog_softc *sc, int core)
  169 {
  170         struct octeon_wdog_core_softc *csc;
  171         int rid, error;
  172 
  173         csc = &sc->sc_cores[core];
  174 
  175         csc->csc_core = core;
  176 
  177         /* Interrupt part */
  178         rid = 0;
  179         csc->csc_intr = bus_alloc_resource(sc->sc_dev, SYS_RES_IRQ, &rid,
  180             OCTEON_IRQ_WDOG0 + core, OCTEON_IRQ_WDOG0 + core, 1, RF_ACTIVE);
  181         if (csc->csc_intr == NULL)
  182                 panic("%s: bus_alloc_resource for core %u failed",
  183                     __func__, core);
  184 
  185         error = bus_setup_intr(sc->sc_dev, csc->csc_intr, INTR_TYPE_MISC,
  186             octeon_wdog_intr, NULL, csc, &csc->csc_intr_cookie);
  187         if (error != 0)
  188                 panic("%s: bus_setup_intr for core %u: %d", __func__, core,
  189                     error);
  190 
  191         bus_bind_intr(sc->sc_dev, csc->csc_intr, core);
  192         bus_describe_intr(sc->sc_dev, csc->csc_intr, csc->csc_intr_cookie,
  193             "cpu%u", core);
  194 
  195         if (sc->sc_armed) {
  196                 /* Armed by default.  */
  197                 octeon_watchdog_arm_core(core);
  198         } else {
  199                 /* Disarmed by default.  */
  200                 octeon_watchdog_disarm_core(core);
  201         }
  202 }
  203 
  204 static int
  205 octeon_wdog_intr(void *arg)
  206 {
  207         struct octeon_wdog_core_softc *csc = arg;
  208 
  209         KASSERT(csc->csc_core == cvmx_get_core_num(),
  210             ("got watchdog interrupt for core %u on core %u.",
  211              csc->csc_core, cvmx_get_core_num()));
  212 
  213         (void)csc;
  214 
  215         /* Poke it! */
  216         cvmx_write_csr(CVMX_CIU_PP_POKEX(cvmx_get_core_num()), 1);
  217 
  218         return (FILTER_HANDLED);
  219 }
  220 
  221 static int
  222 octeon_wdog_probe(device_t dev)
  223 {
  224 
  225         device_set_desc(dev, "Cavium Octeon watchdog timer");
  226         return (0);
  227 }
  228 
  229 static int
  230 octeon_wdog_attach(device_t dev)
  231 {
  232         struct octeon_wdog_softc *sc = device_get_softc(dev);
  233         uint64_t *nmi_handler = (uint64_t*)octeon_wdog_nmi_handler;
  234         int core, i;
  235 
  236         /* Initialise */
  237         sc->sc_armed = 0; /* XXX Ought to be a tunable / config option.  */
  238         sc->sc_debug = 0;
  239 
  240         sc->sc_dev = dev;
  241         EVENTHANDLER_REGISTER(watchdog_list, octeon_wdog_watchdog_fn, sc, 0);
  242         octeon_wdog_sysctl(dev);
  243 
  244         for (i = 0; i < 16; i++) {
  245                 cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, i * 8);
  246                 cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, nmi_handler[i]);
  247         }
  248 
  249         cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0x81fc0000);
  250 
  251         CPU_FOREACH(core)
  252                 octeon_wdog_setup(sc, core);
  253         return (0);
  254 }
  255 
  256 static void
  257 octeon_wdog_identify(driver_t *drv, device_t parent)
  258 {
  259 
  260         BUS_ADD_CHILD(parent, 0, "owdog", 0);
  261 }
  262 
  263 static device_method_t octeon_wdog_methods[] = {
  264         DEVMETHOD(device_identify, octeon_wdog_identify),
  265 
  266         DEVMETHOD(device_probe, octeon_wdog_probe),
  267         DEVMETHOD(device_attach, octeon_wdog_attach),
  268         {0, 0},
  269 };
  270 
  271 static driver_t octeon_wdog_driver = {
  272         "owdog",
  273         octeon_wdog_methods,
  274         sizeof(struct octeon_wdog_softc),
  275 };
  276 static devclass_t octeon_wdog_devclass;
  277 
  278 DRIVER_MODULE(owdog, ciu, octeon_wdog_driver, octeon_wdog_devclass, 0, 0);

Cache object: 1c8765f80fe06cfe03a63a9355d5c927


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