148 lines
3.8 KiB
C
148 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 Semihalf.
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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/bus.h>
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#include <sys/kernel.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 <machine/bus.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/extres/clk/clk.h>
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#include <dev/extres/clk/clk_fixed.h>
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#include <dev/extres/syscon/syscon.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 "syscon_if.h"
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#define BIT(x) (1 << (x))
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#define NB_GPIO1_PIN_LT_L 0x8
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#define NB_GPIO1_MPP1_9 BIT(9)
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struct a37x0_xtal_softc {
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device_t dev;
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struct clkdom *clkdom;
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};
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static int a37x0_xtal_attach(device_t dev);
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static int a37x0_xtal_detach(device_t dev);
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static int a37x0_xtal_probe(device_t dev);
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static device_method_t a37x0_xtal_methods [] = {
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DEVMETHOD(device_probe, a37x0_xtal_probe),
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DEVMETHOD(device_attach, a37x0_xtal_attach),
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DEVMETHOD(device_detach, a37x0_xtal_detach),
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DEVMETHOD_END
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};
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static driver_t a37x0_xtal_driver = {
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"a37x0-xtal",
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a37x0_xtal_methods,
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sizeof(struct a37x0_xtal_softc)
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};
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EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver, 0, 0,
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BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY);
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static int
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a37x0_xtal_attach(device_t dev)
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{
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struct a37x0_xtal_softc *sc;
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struct clk_fixed_def def;
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struct syscon *syscon;
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uint32_t reg;
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int error;
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sc = device_get_softc(dev);
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def.clkdef.name = "armada-3700-xtal";
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def.clkdef.parent_names = NULL;
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def.clkdef.parent_cnt = 0;
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def.clkdef.id = 1;
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def.mult = 0;
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def.div = 0;
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if (SYSCON_GET_HANDLE(dev, &syscon) != 0 || syscon == NULL){
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device_printf(dev, "Cannot get syscon driver handle\n");
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return (ENXIO);
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}
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reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L);
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if (reg & NB_GPIO1_MPP1_9)
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def.freq = 40000000;
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else
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def.freq = 25000000;
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sc->clkdom = clkdom_create(dev);
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error = clknode_fixed_register(sc->clkdom, &def);
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if (error){
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device_printf(dev, "Cannot register clock node\n");
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return (ENXIO);
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}
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error = clkdom_finit(sc->clkdom);
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if (error){
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device_printf(dev, "Cannot finalize clock domain initialization\n");
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return (ENXIO);
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}
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if (bootverbose)
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clkdom_dump(sc->clkdom);
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return (0);
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}
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static int
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a37x0_xtal_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, "marvell,armada-3700-xtal-clock"))
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return (ENXIO);
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device_set_desc(dev, "Marvell Armada 3700 Oscillator");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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a37x0_xtal_detach(device_t dev)
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{
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return (EBUSY);
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}
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