add35ed5b8
to check the status property in their probe routines. Simplebus used to only instantiate its children whose status="okay" but that was improper behavior, fixed in r261352. Now that it doesn't check anymore and probes all its children; the children all have to do the check because really only the children know how to properly interpret their status property strings. Right now all existing drivers only understand "okay" versus something- that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
202 lines
5.1 KiB
C
202 lines
5.1 KiB
C
/*-
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* Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@gmail.com>
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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/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.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/rockchip/rk30xx_wdog.h>
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#ifndef RK30_WDT_BASE
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#define RK30_WDT_BASE 0x2004c000
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#define RK30_WDT_PSIZE 0x100
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#endif
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#define RK30_WDT_READ(_sc, _r) bus_read_4((_sc)->res, (_r))
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#define RK30_WDT_WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
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#define WDOG_CTRL 0x00
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#define WDOG_CTRL_EN (1 << 0)
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#define WDOG_CTRL_RSP_MODE (1 << 1)
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#define WDOG_CTRL_RST_PULSE (4 << 2)
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#define WDOG_CTRL_RST 0xa
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#define WDOG_TORR 0x04
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#define WDOG_TORR_INTVL_SHIFT 0
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#define WDOG_CCVR 0x08
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#define WDOG_CRR 0x0c
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#define WDOG_CRR_PWD 0x76
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#define WDOG_STAT 0x10
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#define WDOG_EOI 0x14
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static struct rk30_wd_softc *rk30_wd_sc = NULL;
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struct rk30_wd_softc {
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device_t dev;
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struct resource *res;
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struct mtx mtx;
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int freq;
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};
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static void rk30_wd_watchdog_fn(void *private, u_int cmd, int *error);
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static int
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rk30_wd_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-wdt")) {
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device_set_desc(dev, "Rockchip RK30XX 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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rk30_wd_attach(device_t dev)
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{
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struct rk30_wd_softc *sc;
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int rid;
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phandle_t node;
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pcell_t cell;
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if (rk30_wd_sc != NULL)
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return (ENXIO);
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(sc->dev);
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if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) > 0)
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sc->freq = cell / 1000000;
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else
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return (ENXIO);
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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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rk30_wd_sc = sc;
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mtx_init(&sc->mtx, "RK30XX Watchdog", "rk30_wd", MTX_DEF);
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EVENTHANDLER_REGISTER(watchdog_list, rk30_wd_watchdog_fn, sc, 0);
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return (0);
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}
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static void
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rk30_wd_watchdog_fn(void *private, u_int cmd, int *error)
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{
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struct rk30_wd_softc *sc;
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uint64_t ms, m, max;
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int i;
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sc = private;
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mtx_lock(&sc->mtx);
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cmd &= WD_INTERVAL;
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if (cmd > 0) {
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ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
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m = 0xffff / sc->freq;
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max = 0x7fffffff / sc->freq + 1;
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i = 0;
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while (m < max && m < ms) {
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m <<= 1;
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i++;
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}
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if (m < max) {
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RK30_WDT_WRITE(sc, WDOG_TORR,
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i << WDOG_TORR_INTVL_SHIFT);
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RK30_WDT_WRITE(sc, WDOG_CTRL,
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WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE |
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WDOG_CTRL_RST_PULSE);
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RK30_WDT_WRITE(sc, WDOG_CRR, WDOG_CRR_PWD);
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*error = 0;
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} else {
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device_printf(sc->dev, "Can not be disabled\n");
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mtx_unlock(&sc->mtx);
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RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
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return;
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}
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}
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else
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RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
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mtx_unlock(&sc->mtx);
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}
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void
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rk30_wd_watchdog_reset()
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{
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bus_space_handle_t bsh;
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bus_space_map(fdtbus_bs_tag, RK30_WDT_BASE, RK30_WDT_PSIZE, 0, &bsh);
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bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_TORR, 0);
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bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_CTRL,
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WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE | WDOG_CTRL_RST_PULSE);
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while (1);
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}
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static device_method_t rk30_wd_methods[] = {
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DEVMETHOD(device_probe, rk30_wd_probe),
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DEVMETHOD(device_attach, rk30_wd_attach),
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DEVMETHOD_END
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};
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static driver_t rk30_wd_driver = {
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"rk30_wd",
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rk30_wd_methods,
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sizeof(struct rk30_wd_softc),
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};
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static devclass_t rk30_wd_devclass;
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DRIVER_MODULE(rk30_wd, simplebus, rk30_wd_driver, rk30_wd_devclass, 0, 0);
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