Differential D32292 Diff 100917 sys/arm/mv/clk/a37x0_xtal.c

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sys/arm/mv/clk/a37x0_xtal.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2021 Semihalf.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/bus.h>
				#include <sys/kernel.h>
				#include <sys/module.h>
				#include <sys/mutex.h>
				#include <sys/rman.h>
				#include <machine/bus.h>

				#include <dev/fdt/simplebus.h>

				#include <dev/extres/clk/clk.h>
				#include <dev/extres/clk/clk_fixed.h>
				#include <dev/extres/syscon/syscon.h>

				#include <dev/ofw/ofw_bus.h>
				#include <dev/ofw/ofw_bus_subr.h>

				#include "syscon_if.h"

				#define BIT(x) (1 << (x))

				#define NB_GPIO1_PIN_LT_L 0x8
				#define NB_GPIO1_MPP1_9 BIT(9)

				struct a37x0_xtal_softc {
				device_t dev;
				struct clkdom *clkdom;
				};

				static devclass_t a37x0_xtal_devclass;

				static int a37x0_xtal_attach(device_t dev);
				static int a37x0_xtal_detach(device_t dev);
				static int a37x0_xtal_probe(device_t dev);

				static device_method_t a37x0_xtal_methods [] = {
				DEVMETHOD(device_probe, a37x0_xtal_probe),
				DEVMETHOD(device_attach, a37x0_xtal_attach),
				DEVMETHOD(device_detach, a37x0_xtal_detach),
				DEVMETHOD_END
				};

				static driver_t a37x0_xtal_driver = {
				"a37x0-xtal",
				a37x0_xtal_methods,
				sizeof(struct a37x0_xtal_softc)
				};

				EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver,
				a37x0_xtal_devclass, 0, 0, BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY);

				static int
				a37x0_xtal_attach(device_t dev)
				{
				struct a37x0_xtal_softc *sc;
				struct clk_fixed_def def;
				struct syscon *syscon;
				phandle_t node;
				uint32_t reg;
				int error;

				node = ofw_bus_get_node(dev);
				sc = device_get_softc(dev);

				def.clkdef.name = "armada-3700-xtal";
				def.clkdef.parent_names = NULL;
				def.clkdef.parent_cnt = 0;
				def.clkdef.id = 1;
				def.mult = 0;
				def.div = 0;

				if (SYSCON_GET_HANDLE(dev, &syscon) != 0 \|\| syscon == NULL){
				device_printf(dev, "Cannot get syscon driver handle\n");
				return (ENXIO);
				}

				reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L);
				if (reg & NB_GPIO1_MPP1_9)
				def.freq = 40000000;
				else
				def.freq = 25000000;

				sc->clkdom = clkdom_create(dev);
				error = clknode_fixed_register(sc->clkdom, &def);
				if (error){
				device_printf(dev, "Cannot register clock node\n");
				return (ENXIO);
				}

				error = clkdom_finit(sc->clkdom);
				if (error){
				device_printf(dev, "Cannot finalize clock domain initialization\n");
				return (ENXIO);
				}

				if (bootverbose)
				clkdom_dump(sc->clkdom);

				return (0);
				}

				static int
				a37x0_xtal_probe(device_t dev)
				{

				if (!ofw_bus_status_okay(dev))
				return (ENXIO);

				if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-xtal-clock"))
				return (ENXIO);

				device_set_desc(dev, "Marvell Armada 3700 Oscillator");
				return (BUS_PROBE_DEFAULT);
				}

				static int
				a37x0_xtal_detach(device_t dev)
				{

				return (EBUSY);
				}