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usr / src / sys / arm / broadcom / bcm2835 /

📁 ..
📄 bcm2835_audio.c(22.97 KB)
📄 bcm2835_bsc.c(21.03 KB)
📄 bcm2835_bscreg.h(2.64 KB)
📄 bcm2835_bscvar.h(2.39 KB)
📄 bcm2835_clkman.c(5.33 KB)
📄 bcm2835_clkman.h(1.7 KB)
📄 bcm2835_cpufreq.c(39.72 KB)
📄 bcm2835_dma.c(18.84 KB)
📄 bcm2835_dma.h(2.42 KB)
📄 bcm2835_fb.c(18.73 KB)
📄 bcm2835_fbd.c(7.13 KB)
📄 bcm2835_firmware.c(5.24 KB)
📄 bcm2835_firmware.h(4.98 KB)
📄 bcm2835_ft5406.c(8.79 KB)
📄 bcm2835_gpio.c(32.85 KB)
📄 bcm2835_intr.c(12.24 KB)
📄 bcm2835_machdep.c(4.74 KB)
📄 bcm2835_mbox.c(14.75 KB)
📄 bcm2835_mbox.h(1.79 KB)
📄 bcm2835_mbox_prop.h(10.12 KB)
📄 bcm2835_pwm.c(13.74 KB)
📄 bcm2835_rng.c(12.86 KB)
📄 bcm2835_sdhci.c(23.72 KB)
📄 bcm2835_sdhost.c(32.03 KB)
📄 bcm2835_spi.c(14.68 KB)
📄 bcm2835_spireg.h(2.82 KB)
📄 bcm2835_spivar.h(2.21 KB)
📄 bcm2835_systimer.c(8.19 KB)
📄 bcm2835_vcbus.c(7.54 KB)
📄 bcm2835_vcbus.h(3.26 KB)
📄 bcm2835_vcio.c(3.01 KB)
📄 bcm2835_wdog.c(6.71 KB)
📄 bcm2835_wdog.h(1.5 KB)
📄 bcm2836.c(19.65 KB)
📄 bcm2836_mp.c(4.04 KB)
📄 bcm2836_mp.h(1.64 KB)
📄 bcm2838_pci.c(19.43 KB)
📄 bcm2838_xhci.c(5.74 KB)
📄 bcm283x_dwc_fdt.c(3.13 KB)
📄 files.bcm2835(63 B)
📄 files.bcm2836(103 B)
📄 files.bcm283x(2.65 KB)
📄 raspberrypi_gpio.c(11.42 KB)
📄 std.bcm2835(199 B)
📄 std.bcm2836(196 B)
📄 std.rpi(37 B)
📄 vc_vchi_audioserv_defs.h(4.06 KB)

Editing: bcm2835_clkman.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2017 Poul-Henning Kamp <phk@FreeBSD.org>
 *
 * 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/systm.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <sys/sema.h>
#include <sys/sysctl.h>

#include <machine/bus.h>
#include <machine/cpu.h>

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

#include <arm/broadcom/bcm2835/bcm2835_clkman.h>

static struct ofw_compat_data compat_data[] = {
	{"brcm,bcm2835-cprman",		1},
	{"broadcom,bcm2835-cprman",	1},
	{NULL,				0}
};

struct bcm2835_clkman_softc {
	device_t		sc_dev;

struct resource *	sc_m_res;
	bus_space_tag_t		sc_m_bst;
	bus_space_handle_t	sc_m_bsh;
};

#define BCM_CLKMAN_WRITE(_sc, _off, _val)              \
    bus_space_write_4(_sc->sc_m_bst, _sc->sc_m_bsh, _off, _val)
#define BCM_CLKMAN_READ(_sc, _off)                     \
    bus_space_read_4(_sc->sc_m_bst, _sc->sc_m_bsh, _off)

#define W_CMCLK(_sc, unit, _val) BCM_CLKMAN_WRITE(_sc, unit, 0x5a000000 | (_val))
#define R_CMCLK(_sc, unit) BCM_CLKMAN_READ(_sc, unit)
#define W_CMDIV(_sc, unit, _val) BCM_CLKMAN_WRITE(_sc, (unit) + 4, 0x5a000000 | (_val))
#define R_CMDIV(_sc,  unit) BCM_CLKMAN_READ(_sc, (unit) + 4)

static int
bcm2835_clkman_probe(device_t dev)
{

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

if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
		return (ENXIO);

device_set_desc(dev, "BCM283x Clock Manager");

return (BUS_PROBE_DEFAULT);
}

static int
bcm2835_clkman_attach(device_t dev)
{
	struct bcm2835_clkman_softc *sc;
	int rid;

if (device_get_unit(dev) != 0) {
		device_printf(dev, "only one clk manager supported\n");
		return (ENXIO);
	}

sc = device_get_softc(dev);
	sc->sc_dev = dev;

rid = 0;
	sc->sc_m_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
	    RF_ACTIVE);
	if (!sc->sc_m_res) {
		device_printf(dev, "cannot allocate memory window\n");
		return (ENXIO);
	}

sc->sc_m_bst = rman_get_bustag(sc->sc_m_res);
	sc->sc_m_bsh = rman_get_bushandle(sc->sc_m_res);

return (bus_generic_attach(dev));
}

uint32_t
bcm2835_clkman_set_frequency(device_t dev, uint32_t unit, uint32_t hz)
{
	struct bcm2835_clkman_softc *sc;
	int i;
	uint32_t u;

sc = device_get_softc(dev);

if (unit != BCM_PWM_CLKSRC) {
		device_printf(sc->sc_dev,
		    "Unsupported unit 0x%x", unit);
		return (0);
	}

W_CMCLK(sc, unit, 6);
	for (i = 0; i < 10; i++) {
		u = R_CMCLK(sc, unit);
		if (!(u&0x80))
			break;
		DELAY(1000);
	}
	if (u & 0x80) {
		device_printf(sc->sc_dev,
		    "Failed to stop clock for unit 0x%x", unit);
		return (0);
	}
	if (hz == 0)
		return (0);

u = 500000000/hz;
	if (u < 4) {
		device_printf(sc->sc_dev,
		    "Frequency too high for unit 0x%x (max: 125 MHz)",
		    unit);
		return (0);
	}
	if (u > 0xfff) {
		device_printf(sc->sc_dev,
		    "Frequency too low for unit 0x%x (min: 123 kHz)",
		    unit);
		return (0);
	}
	hz = 500000000/u;
	W_CMDIV(sc, unit, u << 12);

W_CMCLK(sc, unit, 0x16);
	for (i = 0; i < 10; i++) {
		u = R_CMCLK(sc, unit);
		if ((u&0x80))
			break;
		DELAY(1000);
	}
	if (!(u & 0x80)) {
		device_printf(sc->sc_dev,
		    "Failed to start clock for unit 0x%x", unit);
		return (0);
	}
	return (hz);
}

static int
bcm2835_clkman_detach(device_t dev)
{
	struct bcm2835_clkman_softc *sc;

bus_generic_detach(dev);

sc = device_get_softc(dev);
	if (sc->sc_m_res)
		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_m_res);

return (0);
}

static device_method_t bcm2835_clkman_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		bcm2835_clkman_probe),
	DEVMETHOD(device_attach,	bcm2835_clkman_attach),
	DEVMETHOD(device_detach,	bcm2835_clkman_detach),

DEVMETHOD_END
};

static devclass_t bcm2835_clkman_devclass;
static driver_t bcm2835_clkman_driver = {
	"bcm2835_clkman",
	bcm2835_clkman_methods,
	sizeof(struct bcm2835_clkman_softc),
};

DRIVER_MODULE(bcm2835_clkman, simplebus, bcm2835_clkman_driver,
    bcm2835_clkman_devclass, 0, 0);
MODULE_VERSION(bcm2835_clkman, 1);

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Editing: bcm2835_clkman.c

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