201 lines
5.1 KiB
C
201 lines
5.1 KiB
C
/*-
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* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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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/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <dev/ofw/openfirm.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 "am335x_pwm.h"
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#define ECAP_TSCTR 0x00
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#define ECAP_CAP1 0x08
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#define ECAP_CAP2 0x0C
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#define ECAP_CAP3 0x10
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#define ECAP_CAP4 0x14
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#define ECAP_ECCTL2 0x2A
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#define ECCTL2_MODE_APWM (1 << 9)
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#define ECCTL2_SYNCO_SEL (3 << 6)
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#define ECCTL2_TSCTRSTOP_FREERUN (1 << 4)
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#define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res, reg);
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#define ECAP_WRITE2(_sc, reg, value) \
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bus_write_2((_sc)->sc_mem_res, reg, value);
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#define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res, reg);
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#define ECAP_WRITE4(_sc, reg, value) \
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bus_write_4((_sc)->sc_mem_res, reg, value);
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#define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
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device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF)
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#define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
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static device_probe_t am335x_ecap_probe;
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static device_attach_t am335x_ecap_attach;
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static device_detach_t am335x_ecap_detach;
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struct am335x_ecap_softc {
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device_t sc_dev;
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struct mtx sc_mtx;
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struct resource *sc_mem_res;
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int sc_mem_rid;
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};
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static device_method_t am335x_ecap_methods[] = {
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DEVMETHOD(device_probe, am335x_ecap_probe),
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DEVMETHOD(device_attach, am335x_ecap_attach),
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DEVMETHOD(device_detach, am335x_ecap_detach),
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DEVMETHOD_END
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};
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static driver_t am335x_ecap_driver = {
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"am335x_ecap",
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am335x_ecap_methods,
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sizeof(struct am335x_ecap_softc),
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};
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static devclass_t am335x_ecap_devclass;
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/*
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* API function to set period/duty cycles for ECAPx
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*/
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int
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am335x_pwm_config_ecap(int unit, int period, int duty)
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{
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device_t dev;
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struct am335x_ecap_softc *sc;
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uint16_t reg;
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dev = devclass_get_device(am335x_ecap_devclass, unit);
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if (dev == NULL)
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return (ENXIO);
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if (duty > period)
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return (EINVAL);
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if (period == 0)
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return (EINVAL);
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sc = device_get_softc(dev);
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PWM_LOCK(sc);
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reg = ECAP_READ2(sc, ECAP_ECCTL2);
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reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
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ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
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/* CAP3 in APWM mode is APRD shadow register */
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ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
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/* CAP4 in APWM mode is ACMP shadow register */
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ECAP_WRITE4(sc, ECAP_CAP4, duty);
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/* Restart counter */
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ECAP_WRITE4(sc, ECAP_TSCTR, 0);
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PWM_UNLOCK(sc);
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return (0);
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}
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static int
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am335x_ecap_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, "ti,am33xx-ecap"))
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return (ENXIO);
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device_set_desc(dev, "AM335x eCAP");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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am335x_ecap_attach(device_t dev)
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{
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struct am335x_ecap_softc *sc;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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PWM_LOCK_INIT(sc);
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sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
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&sc->sc_mem_rid, RF_ACTIVE);
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if (sc->sc_mem_res == NULL) {
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device_printf(dev, "cannot allocate memory resources\n");
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goto fail;
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}
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return (0);
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fail:
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PWM_LOCK_DESTROY(sc);
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return (ENXIO);
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}
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static int
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am335x_ecap_detach(device_t dev)
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{
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struct am335x_ecap_softc *sc;
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sc = device_get_softc(dev);
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PWM_LOCK(sc);
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if (sc->sc_mem_res)
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bus_release_resource(dev, SYS_RES_MEMORY,
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sc->sc_mem_rid, sc->sc_mem_res);
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PWM_UNLOCK(sc);
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PWM_LOCK_DESTROY(sc);
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return (0);
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}
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DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, am335x_ecap_devclass, 0, 0);
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MODULE_VERSION(am335x_ecap, 1);
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MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1);
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