214 lines
5.3 KiB
C
214 lines
5.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2017 Poul-Henning Kamp <phk@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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*/
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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 <sys/cpu.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.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 <sys/sema.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <machine/cpu.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 <arm/broadcom/bcm2835/bcm2835_clkman.h>
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static struct ofw_compat_data compat_data[] = {
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{"brcm,bcm2835-cprman", 1},
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{"broadcom,bcm2835-cprman", 1},
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{NULL, 0}
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};
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struct bcm2835_clkman_softc {
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device_t sc_dev;
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struct resource * sc_m_res;
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bus_space_tag_t sc_m_bst;
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bus_space_handle_t sc_m_bsh;
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};
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#define BCM_CLKMAN_WRITE(_sc, _off, _val) \
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bus_space_write_4(_sc->sc_m_bst, _sc->sc_m_bsh, _off, _val)
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#define BCM_CLKMAN_READ(_sc, _off) \
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bus_space_read_4(_sc->sc_m_bst, _sc->sc_m_bsh, _off)
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#define W_CMCLK(_sc, unit, _val) BCM_CLKMAN_WRITE(_sc, unit, 0x5a000000 | (_val))
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#define R_CMCLK(_sc, unit) BCM_CLKMAN_READ(_sc, unit)
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#define W_CMDIV(_sc, unit, _val) BCM_CLKMAN_WRITE(_sc, (unit) + 4, 0x5a000000 | (_val))
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#define R_CMDIV(_sc, unit) BCM_CLKMAN_READ(_sc, (unit) + 4)
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static int
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bcm2835_clkman_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_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "BCM283x Clock Manager");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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bcm2835_clkman_attach(device_t dev)
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{
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struct bcm2835_clkman_softc *sc;
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int rid;
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if (device_get_unit(dev) != 0) {
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device_printf(dev, "only one clk manager supported\n");
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return (ENXIO);
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}
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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rid = 0;
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sc->sc_m_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (!sc->sc_m_res) {
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device_printf(dev, "cannot allocate memory window\n");
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return (ENXIO);
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}
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sc->sc_m_bst = rman_get_bustag(sc->sc_m_res);
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sc->sc_m_bsh = rman_get_bushandle(sc->sc_m_res);
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return (bus_generic_attach(dev));
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}
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uint32_t
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bcm2835_clkman_set_frequency(device_t dev, uint32_t unit, uint32_t hz)
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{
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struct bcm2835_clkman_softc *sc;
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int i;
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uint32_t u;
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sc = device_get_softc(dev);
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if (unit != BCM_PWM_CLKSRC) {
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device_printf(sc->sc_dev,
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"Unsupported unit 0x%x", unit);
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return (0);
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}
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W_CMCLK(sc, unit, 6);
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for (i = 0; i < 10; i++) {
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u = R_CMCLK(sc, unit);
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if (!(u&0x80))
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break;
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DELAY(1000);
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}
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if (u & 0x80) {
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device_printf(sc->sc_dev,
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"Failed to stop clock for unit 0x%x", unit);
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return (0);
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}
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if (hz == 0)
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return (0);
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u = 500000000/hz;
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if (u < 4) {
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device_printf(sc->sc_dev,
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"Frequency too high for unit 0x%x (max: 125 MHz)",
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unit);
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return (0);
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}
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if (u > 0xfff) {
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device_printf(sc->sc_dev,
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"Frequency too low for unit 0x%x (min: 123 kHz)",
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unit);
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return (0);
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}
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hz = 500000000/u;
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W_CMDIV(sc, unit, u << 12);
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W_CMCLK(sc, unit, 0x16);
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for (i = 0; i < 10; i++) {
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u = R_CMCLK(sc, unit);
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if ((u&0x80))
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break;
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DELAY(1000);
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}
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if (!(u & 0x80)) {
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device_printf(sc->sc_dev,
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"Failed to start clock for unit 0x%x", unit);
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return (0);
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}
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return (hz);
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}
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static int
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bcm2835_clkman_detach(device_t dev)
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{
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struct bcm2835_clkman_softc *sc;
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bus_generic_detach(dev);
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sc = device_get_softc(dev);
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if (sc->sc_m_res)
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bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_m_res);
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return (0);
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}
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static device_method_t bcm2835_clkman_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, bcm2835_clkman_probe),
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DEVMETHOD(device_attach, bcm2835_clkman_attach),
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DEVMETHOD(device_detach, bcm2835_clkman_detach),
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DEVMETHOD_END
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};
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static devclass_t bcm2835_clkman_devclass;
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static driver_t bcm2835_clkman_driver = {
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"bcm2835_clkman",
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bcm2835_clkman_methods,
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sizeof(struct bcm2835_clkman_softc),
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};
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DRIVER_MODULE(bcm2835_clkman, simplebus, bcm2835_clkman_driver,
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bcm2835_clkman_devclass, 0, 0);
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MODULE_VERSION(bcm2835_clkman, 1);
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