From 7adbe5b0bd87b3946b7f274fe8924168133333c3 Mon Sep 17 00:00:00 2001 From: Vijay Kumar Banerjee Date: Sun, 4 Aug 2019 01:49:44 +0530 Subject: am335x display drivers: Import from FreeBSD --- freebsd/sys/arm/ti/am335x/am335x_ecap.c | 202 ++++++++++++++++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 freebsd/sys/arm/ti/am335x/am335x_ecap.c (limited to 'freebsd/sys/arm/ti/am335x/am335x_ecap.c') diff --git a/freebsd/sys/arm/ti/am335x/am335x_ecap.c b/freebsd/sys/arm/ti/am335x/am335x_ecap.c new file mode 100644 index 00000000..9ebc51db --- /dev/null +++ b/freebsd/sys/arm/ti/am335x/am335x_ecap.c @@ -0,0 +1,202 @@ +#include + +/*- + * Copyright (c) 2013 Oleksandr Tymoshenko + * All rights reserved. + * + * 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 +__FBSDID("$FreeBSD$"); + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include + +#include "am335x_pwm.h" + +#define ECAP_TSCTR 0x00 +#define ECAP_CAP1 0x08 +#define ECAP_CAP2 0x0C +#define ECAP_CAP3 0x10 +#define ECAP_CAP4 0x14 +#define ECAP_ECCTL2 0x2A +#define ECCTL2_MODE_APWM (1 << 9) +#define ECCTL2_SYNCO_SEL (3 << 6) +#define ECCTL2_TSCTRSTOP_FREERUN (1 << 4) + +#define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res, reg); +#define ECAP_WRITE2(_sc, reg, value) \ + bus_write_2((_sc)->sc_mem_res, reg, value); +#define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res, reg); +#define ECAP_WRITE4(_sc, reg, value) \ + bus_write_4((_sc)->sc_mem_res, reg, value); + +#define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) +#define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) +#define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \ + device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF) +#define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx) + +static device_probe_t am335x_ecap_probe; +static device_attach_t am335x_ecap_attach; +static device_detach_t am335x_ecap_detach; + +struct am335x_ecap_softc { + device_t sc_dev; + struct mtx sc_mtx; + struct resource *sc_mem_res; + int sc_mem_rid; +}; + +static device_method_t am335x_ecap_methods[] = { + DEVMETHOD(device_probe, am335x_ecap_probe), + DEVMETHOD(device_attach, am335x_ecap_attach), + DEVMETHOD(device_detach, am335x_ecap_detach), + + DEVMETHOD_END +}; + +static driver_t am335x_ecap_driver = { + "am335x_ecap", + am335x_ecap_methods, + sizeof(struct am335x_ecap_softc), +}; + +static devclass_t am335x_ecap_devclass; + +/* + * API function to set period/duty cycles for ECAPx + */ +int +am335x_pwm_config_ecap(int unit, int period, int duty) +{ + device_t dev; + struct am335x_ecap_softc *sc; + uint16_t reg; + + dev = devclass_get_device(am335x_ecap_devclass, unit); + if (dev == NULL) + return (ENXIO); + + if (duty > period) + return (EINVAL); + + if (period == 0) + return (EINVAL); + + sc = device_get_softc(dev); + PWM_LOCK(sc); + + reg = ECAP_READ2(sc, ECAP_ECCTL2); + reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL; + ECAP_WRITE2(sc, ECAP_ECCTL2, reg); + + /* CAP3 in APWM mode is APRD shadow register */ + ECAP_WRITE4(sc, ECAP_CAP3, period - 1); + + /* CAP4 in APWM mode is ACMP shadow register */ + ECAP_WRITE4(sc, ECAP_CAP4, duty); + /* Restart counter */ + ECAP_WRITE4(sc, ECAP_TSCTR, 0); + + PWM_UNLOCK(sc); + + return (0); +} + +static int +am335x_ecap_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "ti,am33xx-ecap")) + return (ENXIO); + + device_set_desc(dev, "AM335x eCAP"); + + return (BUS_PROBE_DEFAULT); +} + +static int +am335x_ecap_attach(device_t dev) +{ + struct am335x_ecap_softc *sc; + + sc = device_get_softc(dev); + sc->sc_dev = dev; + + PWM_LOCK_INIT(sc); + + sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, + &sc->sc_mem_rid, RF_ACTIVE); + if (sc->sc_mem_res == NULL) { + device_printf(dev, "cannot allocate memory resources\n"); + goto fail; + } + + return (0); + +fail: + PWM_LOCK_DESTROY(sc); + return (ENXIO); +} + +static int +am335x_ecap_detach(device_t dev) +{ + struct am335x_ecap_softc *sc; + + sc = device_get_softc(dev); + + PWM_LOCK(sc); + if (sc->sc_mem_res) + bus_release_resource(dev, SYS_RES_MEMORY, + sc->sc_mem_rid, sc->sc_mem_res); + PWM_UNLOCK(sc); + + PWM_LOCK_DESTROY(sc); + + + return (0); +} + +DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, am335x_ecap_devclass, 0, 0); +MODULE_VERSION(am335x_ecap, 1); +MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1); -- cgit v1.2.3