260 lines
6.6 KiB
C
260 lines
6.6 KiB
C
/*-
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* Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Watchdog driver for Cavium Octeon
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/watchdog.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <sys/rman.h>
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#include <sys/smp.h>
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#include <contrib/octeon-sdk/cvmx.h>
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#include <contrib/octeon-sdk/cvmx-interrupt.h>
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#define DEFAULT_TIMER_VAL 65535
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struct octeon_wdog_softc {
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device_t dev;
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/* XXX: replace with repscive CVMX_ constant */
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struct resource *irq_res[16];
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void *intr_hdl[16];
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int armed;
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int debug;
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};
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extern void octeon_wdog_nmi_handler(void);
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void octeon_wdog_nmi(void);
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static void octeon_watchdog_arm_core(int core, unsigned long timer_val);
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static void octeon_watchdog_disarm_core(int core);
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static int octeon_wdog_attach(device_t dev);
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static void octeon_wdog_identify(driver_t *drv, device_t parent);
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static int octeon_wdog_intr(void *);;
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static int octeon_wdog_probe(device_t dev);
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static void octeon_wdog_setup(struct octeon_wdog_softc *sc, int cpu);
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static void octeon_wdog_sysctl(device_t dev);
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static void octeon_wdog_watchdog_fn(void *private, u_int cmd, int *error);
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void
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octeon_wdog_nmi()
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{
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/* XXX: Add something useful here */
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printf("NMI detected\n");
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/*
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* This is the end
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* Beautiful friend
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*
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* Just wait for Soft Reset to come and take us
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*/
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for (;;)
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;
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}
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static void
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octeon_watchdog_arm_core(int core, unsigned long timer_val)
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{
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cvmx_ciu_wdogx_t ciu_wdog;
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/* Poke it! */
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cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1);
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ciu_wdog.u64 = 0;
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ciu_wdog.s.len = timer_val;
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ciu_wdog.s.mode = 3;
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cvmx_write_csr(CVMX_CIU_WDOGX(core), ciu_wdog.u64);
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}
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static void
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octeon_watchdog_disarm_core(int core)
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{
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cvmx_write_csr(CVMX_CIU_WDOGX(core), 0);
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}
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static void
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octeon_wdog_watchdog_fn(void *private, u_int cmd, int *error)
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{
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struct octeon_wdog_softc *sc = private;
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uint64_t timer_val = 0;
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cmd &= WD_INTERVAL;
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if (sc->debug)
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device_printf(sc->dev, "octeon_wdog_watchdog_fn: cmd: %x\n", cmd);
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if (cmd > 0) {
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if (sc->debug)
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device_printf(sc->dev, "octeon_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
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/*
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* XXX: This should be done for every core and with value
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* calculated based on CPU frquency
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*/
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octeon_watchdog_arm_core(cvmx_get_core_num(), DEFAULT_TIMER_VAL);
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sc->armed = 1;
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*error = 0;
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} else {
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if (sc->debug)
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device_printf(sc->dev, "octeon_wdog_watchdog_fn: disarming\n");
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if (sc->armed) {
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sc->armed = 0;
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/* XXX: This should be done for every core */
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octeon_watchdog_disarm_core(cvmx_get_core_num());
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}
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}
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}
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static void
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octeon_wdog_sysctl(device_t dev)
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{
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struct octeon_wdog_softc *sc = device_get_softc(dev);
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struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
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struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"debug", CTLFLAG_RW, &sc->debug, 0,
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"enable watchdog debugging");
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"armed", CTLFLAG_RD, &sc->armed, 0,
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"whether the watchdog is armed");
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}
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static void
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octeon_wdog_setup(struct octeon_wdog_softc *sc, int cpu)
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{
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int core, rid, err;
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/* XXX: map cpu id to core here ? */
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core = cvmx_get_core_num();
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/* Interrupt part */
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rid = 0;
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sc->irq_res[core] =
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bus_alloc_resource(sc->dev, SYS_RES_IRQ, &rid,
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CVMX_IRQ_WDOG0+core,
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CVMX_IRQ_WDOG0+core, 1, RF_ACTIVE);
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if (!(sc->irq_res[core]))
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goto error;
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err = bus_setup_intr(sc->dev, sc->irq_res[core], INTR_TYPE_MISC,
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octeon_wdog_intr, NULL, sc, &sc->intr_hdl[core]);
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if (err)
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goto error;
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/* XXX: pin interrupt handler to the respective core */
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/* Disarm by default */
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octeon_watchdog_disarm_core(core);
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return;
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error:
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panic("failed to setup watchdog interrupt for core %d", core);
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}
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static int
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octeon_wdog_intr(void *sc)
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{
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/* Poke it! */
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cvmx_write_csr(CVMX_CIU_PP_POKEX(cvmx_get_core_num()), 1);
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return (FILTER_HANDLED);
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}
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static int
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octeon_wdog_probe(device_t dev)
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{
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device_set_desc(dev, "Cavium Octeon watchdog timer");
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return (0);
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}
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static int
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octeon_wdog_attach(device_t dev)
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{
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struct octeon_wdog_softc *sc = device_get_softc(dev);
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int i;
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uint64_t *nmi_handler = (uint64_t*)octeon_wdog_nmi_handler;
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/* Initialise */
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sc->armed = 0;
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sc->debug = 0;
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sc->dev = dev;
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EVENTHANDLER_REGISTER(watchdog_list, octeon_wdog_watchdog_fn, sc, 0);
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octeon_wdog_sysctl(dev);
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for (i = 0; i < 16; i++) {
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cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, i * 8);
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cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, nmi_handler[i]);
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}
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cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0x81fc0000);
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/* XXX: This should be done for every core */
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octeon_wdog_setup(sc, cvmx_get_core_num());
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return (0);
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}
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static void
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octeon_wdog_identify(driver_t *drv, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "octeon_wdog", 0);
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}
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static device_method_t octeon_wdog_methods[] = {
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DEVMETHOD(device_identify, octeon_wdog_identify),
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DEVMETHOD(device_probe, octeon_wdog_probe),
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DEVMETHOD(device_attach, octeon_wdog_attach),
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{0, 0},
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};
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static driver_t octeon_wdog_driver = {
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"octeon_wdog",
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octeon_wdog_methods,
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sizeof(struct octeon_wdog_softc),
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};
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static devclass_t octeon_wdog_devclass;
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DRIVER_MODULE(octeon_wdog, ciu, octeon_wdog_driver, octeon_wdog_devclass, 0, 0);
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