5b03aba6c8
files to vendor-provided ones. It should make easier to adopt platform code to new revisions of hardware and to use DTS overlays for various Beaglebone extensions (shields/capes). Original dts filenames were not changed, they're now wrappers over dts files provided by TI. So make sure you update .dtb files on your devices as part of kernel update GPIO addressing was changed: instead of one global /dev/gpioc0 there are per-bank instances of /dev/gpiocX. Each bank has 32 pins so for instance pin 121 on /dev/gpioc0 in old addressing scheme is now pin 25 on /dev/gpioc3 On Pandaboard serial console devices was changed from /dev/ttyu0 to /dev/ttyu2 so you'll have to update /etc/ttys to get login prompt on serial port in multiuser mode. Single user mode serial console should work as-is Differential Revision: https://reviews.freebsd.org/D2146 Reviewed by: rpaulo, ian, Michal Meloun, Svatopluk Kraus
202 lines
5.1 KiB
C
202 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/fdt/fdt_common.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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