1b1a53cf46
- Interrupts controller - Watchdog - System timer - Framebuffer (hardcoded resolution/bpp)
168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/*-
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* Copyright (c) 2012 Alexander Rybalko <ray@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, this list of conditions and the following 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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#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/rman.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/cpufunc.h>
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#include <machine/machdep.h>
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#include <machine/fdt.h>
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#include <arm/broadcom/bcm2835/bcm2835_wdog.h>
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#define BCM2835_PASWORD 0x5a
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#define BCM2835_WDOG_RESET 0
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#define BCM2835_PASSWORD_MASK 0xff000000
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#define BCM2835_PASSWORD_SHIFT 24
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#define BCM2835_WDOG_TIME_MASK 0x000fffff
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#define BCM2835_WDOG_TIME_SHIFT 0
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#define READ(_sc, _r) bus_space_read_4((_sc)->bst, (_sc)->bsh, (_r))
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#define WRITE(_sc, _r, _v) bus_space_write_4((_sc)->bst, (_sc)->bsh, (_r), (_v))
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#define BCM2835_RSTC_WRCFG_CLR 0xffffffcf
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#define BCM2835_RSTC_WRCFG_SET 0x00000030
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#define BCM2835_RSTC_WRCFG_FULL_RESET 0x00000020
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#define BCM2835_RSTC_RESET 0x00000102
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#define BCM2835_RSTC_REG 0x00
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#define BCM2835_RSTS_REG 0x04
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#define BCM2835_WDOG_REG 0x08
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static struct bcmwd_softc *bcmwd_lsc = NULL;
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struct bcmwd_softc {
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device_t dev;
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struct resource * res;
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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int wdog_armed;
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int wdog_period;
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char wdog_passwd;
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};
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#ifdef notyet
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static void bcmwd_watchdog_fn(void *private, u_int cmd, int *error);
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#endif
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static int
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bcmwd_probe(device_t dev)
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{
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if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-wdt")) {
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device_set_desc(dev, "BCM2708/2835 Watchdog");
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return (BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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bcmwd_attach(device_t dev)
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{
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struct bcmwd_softc *sc;
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int rid;
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if (bcmwd_lsc != NULL)
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return (ENXIO);
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sc = device_get_softc(dev);
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sc->wdog_period = 7;
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sc->wdog_passwd = BCM2835_PASWORD;
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sc->wdog_armed = 0;
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sc->dev = dev;
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rid = 0;
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sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->res == NULL) {
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device_printf(dev, "could not allocate memory resource\n");
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return (ENXIO);
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}
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sc->bst = rman_get_bustag(sc->res);
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sc->bsh = rman_get_bushandle(sc->res);
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bcmwd_lsc = sc;
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#ifdef notyet
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EVENTHANDLER_REGISTER(watchdog_list, bcmwd_watchdog_fn, sc, 0);
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#endif
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return (0);
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}
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#ifdef notyet
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static void
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bcmwd_watchdog_fn(void *private, u_int cmd, int *error)
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{
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/* XXX: not yet */
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}
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#endif
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void
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bcmwd_watchdog_reset()
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{
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if (bcmwd_lsc == NULL)
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return;
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WRITE(bcmwd_lsc, BCM2835_WDOG_REG,
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(BCM2835_PASWORD << BCM2835_PASSWORD_SHIFT) | 10);
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WRITE(bcmwd_lsc, BCM2835_RSTC_REG,
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(READ(bcmwd_lsc, BCM2835_RSTC_REG) & BCM2835_RSTC_WRCFG_CLR) |
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(BCM2835_PASWORD << BCM2835_PASSWORD_SHIFT) |
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BCM2835_RSTC_WRCFG_FULL_RESET);
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}
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static device_method_t bcmwd_methods[] = {
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DEVMETHOD(device_probe, bcmwd_probe),
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DEVMETHOD(device_attach, bcmwd_attach),
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DEVMETHOD_END
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};
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static driver_t bcmwd_driver = {
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"bcmwd",
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bcmwd_methods,
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sizeof(struct bcmwd_softc),
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};
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static devclass_t bcmwd_devclass;
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DRIVER_MODULE(bcmwd, simplebus, bcmwd_driver, bcmwd_devclass, 0, 0);
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