Add ARMADA38X clkgen driver
This patch introduces clkgen driver for Armada38x SoCs. Clock topology consists of single coreclk which supplies clock signal to CPU cores and peripherials. Reviewed by: manu Obtained from: Semihalf Differential Revision: https://reviews.freebsd.org/D36453
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sys/arm/mv/clk/armada38x_coreclk.c
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sys/arm/mv/clk/armada38x_coreclk.c
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FressBSD$");
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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 <machine/fdt.h>
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#include <dev/fdt/simplebus.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 <dev/extres/clk/clk.h>
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#include <arm/mv/mvwin.h>
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#include <arm/mv/mvreg.h>
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#include <arm/mv/mvvar.h>
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#include <arm/mv/clk/armada38x_gen.h>
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#include "clkdev_if.h"
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#define ARMADA38X_CORECLK_MAXREG 0
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static struct resource_spec armada38x_coreclk_specs[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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struct armada38x_coreclk_softc {
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struct resource *res;
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struct clkdom *clkdom;
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struct mtx mtx;
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};
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static int armada38x_coreclk_attach(device_t dev);
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static int armada38x_coreclk_probe(device_t dev);
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static struct armada38x_gen_clknode_def gen_nodes[] =
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{
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{
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.def = {
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.name = "coreclk_0",
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.id = 0,
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.parent_cnt = 0,
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},
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},
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{
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.def = {
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.name = "coreclk_2",
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.id = 1,
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.parent_cnt = 0,
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},
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}
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};
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static int
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armada38x_coreclk_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
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{
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struct armada38x_coreclk_softc *sc;
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sc = device_get_softc(dev);
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if (addr > ARMADA38X_CORECLK_MAXREG)
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return (EINVAL);
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*val = bus_read_4(sc->res, addr);
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return (0);
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}
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static int
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armada38x_coreclk_write_4(device_t dev, bus_addr_t addr, uint32_t val)
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{
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struct armada38x_coreclk_softc *sc;
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sc = device_get_softc(dev);
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if (addr > ARMADA38X_CORECLK_MAXREG)
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return (EINVAL);
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bus_write_4(sc->res, addr, val);
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return (0);
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}
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static void
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armada38x_coreclk_device_lock(device_t dev)
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{
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struct armada38x_coreclk_softc *sc;
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sc = device_get_softc(dev);
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mtx_lock(&sc->mtx);
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}
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static void
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armada38x_coreclk_device_unlock(device_t dev)
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{
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struct armada38x_coreclk_softc *sc;
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sc = device_get_softc(dev);
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mtx_unlock(&sc->mtx);
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}
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static int
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armada38x_coreclk_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-380-core-clock"))
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return (ENXIO);
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device_set_desc(dev, "ARMADA38X core-clock");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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armada38x_coreclk_create_coreclk(device_t dev)
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{
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struct armada38x_coreclk_softc *sc;
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int rv, i;
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sc = device_get_softc(dev);
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for (i = 0; i < nitems(gen_nodes); ++i) {
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rv = armada38x_gen_register(sc->clkdom, &gen_nodes[i]);
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if (rv)
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return (rv);
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}
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return (rv);
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}
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static int
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armada38x_coreclk_attach(device_t dev)
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{
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struct armada38x_coreclk_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if (bus_alloc_resources(dev, armada38x_coreclk_specs, &sc->res) != 0) {
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device_printf(dev, "Cannot allocate resources.\n");
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return (ENXIO);
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}
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mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);
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sc->clkdom = clkdom_create(dev);
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if (NULL == sc->clkdom) {
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device_printf(dev, "Cannot create clkdom\n");
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return (ENXIO);
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}
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error = armada38x_coreclk_create_coreclk(dev);
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if (0 != error) {
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device_printf(dev, "Cannot create coreclk.\n");
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return (error);
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}
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if (clkdom_finit(sc->clkdom) != 0)
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panic("Cannot finalize clock domain initialization.\n");
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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 device_method_t amada38x_coreclk_methods[] = {
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DEVMETHOD(clkdev_write_4, armada38x_coreclk_write_4),
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DEVMETHOD(clkdev_read_4, armada38x_coreclk_read_4),
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DEVMETHOD(clkdev_device_lock, armada38x_coreclk_device_lock),
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DEVMETHOD(clkdev_device_unlock, armada38x_coreclk_device_unlock),
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DEVMETHOD(device_attach, armada38x_coreclk_attach),
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DEVMETHOD(device_probe, armada38x_coreclk_probe),
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DEVMETHOD_END
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};
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static driver_t armada38x_coreclk_driver = {
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"armada38x_coreclk",
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amada38x_coreclk_methods,
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sizeof(struct armada38x_coreclk_softc),
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};
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EARLY_DRIVER_MODULE(armada38x_coreclk, simplebus, armada38x_coreclk_driver, 0, 0,
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BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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100
sys/arm/mv/clk/armada38x_gen.c
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100
sys/arm/mv/clk/armada38x_gen.c
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@ -0,0 +1,100 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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/bus.h>
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#include <machine/bus.h>
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#include <dev/extres/clk/clk.h>
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#include <arm/mv/clk/armada38x_gen.h>
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#include "clkdev_if.h"
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#define SAR_A38X_TCLK_FREQ_SHIFT 15
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#define SAR_A38X_TCLK_FREQ_MASK 0x00008000
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#define TCLK_250MHZ 250 * 1000 * 1000
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#define TCLK_200MHZ 200 * 1000 * 1000
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#define WR4(_clk, offset, val) \
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CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val)
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#define RD4(_clk, offset, val) \
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CLKDEV_READ_4(clknode_get_device(_clk), offset, val)
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#define DEVICE_LOCK(_clk) \
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CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
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#define DEVICE_UNLOCK(_clk) \
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CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
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static int
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armada38x_gen_recalc(struct clknode *clk, uint64_t *freq)
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{
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uint32_t reg;
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DEVICE_LOCK(clk);
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RD4(clk, 0, ®);
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DEVICE_UNLOCK(clk);
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reg = (reg & SAR_A38X_TCLK_FREQ_MASK) >> SAR_A38X_TCLK_FREQ_SHIFT;
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*freq = reg ? TCLK_200MHZ : TCLK_250MHZ;
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return (0);
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}
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static int
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armada38x_gen_init(struct clknode *clk, device_t dev)
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{
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return (0);
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}
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static clknode_method_t armada38x_gen_clknode_methods[] = {
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/* Device interface */
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CLKNODEMETHOD(clknode_init, armada38x_gen_init),
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CLKNODEMETHOD(clknode_recalc_freq, armada38x_gen_recalc),
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CLKNODEMETHOD_END
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};
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DEFINE_CLASS_1(armada38x_gen_clknode, armada38x_gen_clknode_class,
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armada38x_gen_clknode_methods, 0, clknode_class);
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int
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armada38x_gen_register(struct clkdom *clkdom, const struct armada38x_gen_clknode_def *clkdef)
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{
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struct clknode *clk;
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clk = clknode_create(clkdom, &armada38x_gen_clknode_class, &clkdef->def);
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if (clk == NULL)
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return (1);
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clknode_register(clkdom, clk);
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return(0);
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}
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40
sys/arm/mv/clk/armada38x_gen.h
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40
sys/arm/mv/clk/armada38x_gen.h
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@ -0,0 +1,40 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ARMADA38X_GEN_H_
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#define _ARMADA38X_GEN_H_
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#include <dev/extres/clk/clk.h>
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struct armada38x_gen_clknode_def
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{
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struct clknode_init_def def;
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};
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int armada38x_gen_register(struct clkdom *clkdom,
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const struct armada38x_gen_clknode_def *clkdef);
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#endif
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@ -34,3 +34,6 @@ dev/usb/controller/ehci_mv.c optional ehci
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dev/usb/controller/generic_xhci.c optional xhci
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dev/usb/controller/generic_xhci_fdt.c optional xhci
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dev/ahci/ahci_mv_fdt.c optional ahci
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arm/mv/clk/armada38x_coreclk.c standard
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arm/mv/clk/armada38x_gen.c standard
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