146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 Brandon Bergren <bdragon@FreeBSD.org>
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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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/openfirm.h>
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#include <powerpc/powermac/macgpiovar.h>
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#include <powerpc/powermac/platform_powermac.h>
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static int tbgpio_probe(device_t);
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static int tbgpio_attach(device_t);
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static void tbgpio_freeze_timebase(device_t, bool);
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static device_method_t tbgpio_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, tbgpio_probe),
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DEVMETHOD(device_attach, tbgpio_attach),
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DEVMETHOD_END
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};
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struct tbgpio_softc {
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uint32_t sc_value;
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uint32_t sc_mask;
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};
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static driver_t tbgpio_driver = {
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"tbgpio",
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tbgpio_methods,
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sizeof(struct tbgpio_softc)
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};
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EARLY_DRIVER_MODULE(tbgpio, macgpio, tbgpio_driver, 0, 0, BUS_PASS_CPU);
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static int
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tbgpio_probe(device_t dev)
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{
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phandle_t node;
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const char *name;
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pcell_t pfunc[32];
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int res;
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name = ofw_bus_get_name(dev);
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node = ofw_bus_get_node(dev);
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if (strcmp(name, "timebase-enable") != 0)
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return (ENXIO);
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res = OF_getencprop(node, "platform-do-cpu-timebase", pfunc,
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sizeof(pfunc));
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if (res == -1)
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return (ENXIO);
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/*
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* If this doesn't look like a simple gpio_write pfunc,
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* complain about it so we can collect the pfunc.
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*/
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if (res != 20 || pfunc[2] != 0x01) {
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printf("\nUnknown platform function detected!\n");
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printf("Please send a PR including the following data:\n");
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printf("===================\n");
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printf("Func: platform-do-cpu-timebase\n");
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hexdump(pfunc, res, NULL, HD_OMIT_CHARS);
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printf("===================\n");
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return (ENXIO);
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}
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device_set_desc(dev, "CPU Timebase Control");
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return (BUS_PROBE_SPECIFIC);
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}
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static int
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tbgpio_attach(device_t dev)
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{
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phandle_t node;
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struct tbgpio_softc *sc;
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/*
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* Structure of pfunc:
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* pfunc[0]: phandle to /cpus
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* pfunc[1]: flags
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* pfunc[2]: 0x1 == CMD_WRITE_GPIO
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* pfunc[3]: value
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* pfunc[4]: mask
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*/
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pcell_t pfunc[5];
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sc = device_get_softc(dev);
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node = ofw_bus_get_node(dev);
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OF_getencprop(node, "platform-do-cpu-timebase", pfunc, sizeof(pfunc));
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sc->sc_value = pfunc[3];
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sc->sc_mask = pfunc[4];
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powermac_register_timebase(dev, tbgpio_freeze_timebase);
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return (0);
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}
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static void
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tbgpio_freeze_timebase(device_t dev, bool freeze)
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{
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struct tbgpio_softc *sc;
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uint32_t val;
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sc = device_get_softc(dev);
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val = sc->sc_value;
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if (freeze)
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val = ~val;
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val &= sc->sc_mask;
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macgpio_write(dev, val);
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}
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