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bytgpio.c
(15.95 KB)
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chvgpio.c
(12.67 KB)
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chvgpio_reg.h
(7.68 KB)
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dwgpio
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gpio_if.m
(4.13 KB)
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gpiobacklight.c
(4.42 KB)
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gpiobus.c
(27.08 KB)
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gpiobus_if.m
(2.58 KB)
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gpiobusvar.h
(6.03 KB)
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gpioc.c
(26.91 KB)
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gpioiic.c
(9.97 KB)
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gpiokeys.c
(23.94 KB)
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gpiokeys.h
(1.67 KB)
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gpiokeys_codes.c
(3.55 KB)
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gpioled.c
(4.2 KB)
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gpioled_fdt.c
(5.44 KB)
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gpiomdio.c
(6.57 KB)
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gpiopower.c
(3.54 KB)
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gpiopps.c
(7.97 KB)
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gpioregulator.c
(8.51 KB)
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gpiospi.c
(9.93 KB)
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gpioths.c
(11.83 KB)
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ofw_gpiobus.c
(13.45 KB)
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pl061.c
(14.16 KB)
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pl061.h
(1.94 KB)
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pl061_acpi.c
(2.91 KB)
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pl061_fdt.c
(2.83 KB)
Editing: gpiopps.c
/*- * Copyright (c) 2016 Ian Lepore <ian@FreeBSD.org> * 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 <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/gpio.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/module.h> #include <sys/bus.h> #include <sys/conf.h> #include <sys/timepps.h> #include <dev/gpio/gpiobusvar.h> #include "opt_platform.h" #ifdef FDT #include <dev/ofw/ofw_bus.h> static struct ofw_compat_data compat_data[] = { {"pps-gpio", 1}, {NULL, 0} }; SIMPLEBUS_PNP_INFO(compat_data); #endif /* FDT */ static devclass_t pps_devclass; struct pps_softc { device_t dev; gpio_pin_t gpin; void *ihandler; struct resource *ires; int irid; struct cdev *pps_cdev; struct pps_state pps_state; struct mtx pps_mtx; bool falling_edge; }; #define PPS_CDEV_NAME "gpiopps" static int gpiopps_open(struct cdev *dev, int flags, int fmt, struct thread *td) { struct pps_softc *sc = dev->si_drv1; /* We can't be unloaded while open, so mark ourselves BUSY. */ mtx_lock(&sc->pps_mtx); if (device_get_state(sc->dev) < DS_BUSY) { device_busy(sc->dev); } mtx_unlock(&sc->pps_mtx); return 0; } static int gpiopps_close(struct cdev *dev, int flags, int fmt, struct thread *td) { struct pps_softc *sc = dev->si_drv1; /* * Un-busy on last close. We rely on the vfs counting stuff to only call * this routine on last-close, so we don't need any open-count logic. */ mtx_lock(&sc->pps_mtx); device_unbusy(sc->dev); mtx_unlock(&sc->pps_mtx); return 0; } static int gpiopps_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) { struct pps_softc *sc = dev->si_drv1; int err; /* Let the kernel do the heavy lifting for ioctl. */ mtx_lock(&sc->pps_mtx); err = pps_ioctl(cmd, data, &sc->pps_state); mtx_unlock(&sc->pps_mtx); return err; } static struct cdevsw pps_cdevsw = { .d_version = D_VERSION, .d_open = gpiopps_open, .d_close = gpiopps_close, .d_ioctl = gpiopps_ioctl, .d_name = PPS_CDEV_NAME, }; static int gpiopps_ifltr(void *arg) { struct pps_softc *sc = arg; /* * There is no locking here by design... The kernel cleverly captures * the current time into an area of the pps_state structure which is * written only by the pps_capture() routine and read only by the * pps_event() routine. We don't need lock-based management of access * to the capture area because we have time-based access management: we * can't be reading and writing concurently because we can't be running * both the threaded and filter handlers concurrently (because a new * hardware interrupt can't happen until the threaded handler for the * current interrupt exits, after which the system does the EOI that * enables a new hardware interrupt). */ pps_capture(&sc->pps_state); return (FILTER_SCHEDULE_THREAD); } static void gpiopps_ithrd(void *arg) { struct pps_softc *sc = arg; /* * Go create a pps event from the data captured in the filter handler. * * Note that we DO need locking here, unlike the case with the filter * handler. The pps_event() routine updates the non-capture part of the * pps_state structure, and the ioctl() code could be accessing that * data right now in a non-interrupt context, so we need an interlock. */ mtx_lock(&sc->pps_mtx); pps_event(&sc->pps_state, PPS_CAPTUREASSERT); mtx_unlock(&sc->pps_mtx); } static int gpiopps_detach(device_t dev) { struct pps_softc *sc = device_get_softc(dev); if (sc->pps_cdev != NULL) destroy_dev(sc->pps_cdev); if (sc->ihandler != NULL) bus_teardown_intr(dev, sc->ires, sc->ihandler); if (sc->ires != NULL) bus_release_resource(dev, SYS_RES_IRQ, sc->irid, sc->ires); if (sc->gpin != NULL) gpiobus_release_pin(GPIO_GET_BUS(sc->gpin->dev), sc->gpin->pin); return (0); } #ifdef FDT static int gpiopps_fdt_attach(device_t dev) { struct pps_softc *sc; struct make_dev_args devargs; phandle_t node; uint32_t edge, pincaps; int err; sc = device_get_softc(dev); sc->dev = dev; mtx_init(&sc->pps_mtx, device_get_nameunit(dev), NULL, MTX_DEF); /* Initialize the pps_state struct. */ sc->pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; sc->pps_state.driver_abi = PPS_ABI_VERSION; sc->pps_state.driver_mtx = &sc->pps_mtx; pps_init_abi(&sc->pps_state); /* Check which edge we're configured to capture (default is rising). */ if (ofw_bus_has_prop(dev, "assert-falling-edge")) edge = GPIO_INTR_EDGE_FALLING; else edge = GPIO_INTR_EDGE_RISING; /* * Look up the configured gpio pin and ensure it can be configured for * the interrupt mode we need. */ node = ofw_bus_get_node(dev); if ((err = gpio_pin_get_by_ofw_idx(dev, node, 0, &sc->gpin)) != 0) { device_printf(dev, "Cannot obtain gpio pin\n"); return (err); } device_printf(dev, "PPS input on %s pin %u\n", device_get_nameunit(sc->gpin->dev), sc->gpin->pin); if ((err = gpio_pin_getcaps(sc->gpin, &pincaps)) != 0) { device_printf(dev, "Cannot query capabilities of gpio pin\n"); gpiopps_detach(dev); return (err); } if ((pincaps & edge) == 0) { device_printf(dev, "Pin cannot be configured for the requested signal edge\n"); gpiopps_detach(dev); return (ENOTSUP); } /* * Transform our 'gpios' property into an interrupt resource and set up * the interrupt. */ if ((sc->ires = gpio_alloc_intr_resource(dev, &sc->irid, RF_ACTIVE, sc->gpin, edge)) == NULL) { device_printf(dev, "Cannot allocate an IRQ for the GPIO\n"); gpiopps_detach(dev); return (err); } err = bus_setup_intr(dev, sc->ires, INTR_TYPE_CLK | INTR_MPSAFE, gpiopps_ifltr, gpiopps_ithrd, sc, &sc->ihandler); if (err != 0) { device_printf(dev, "Unable to setup pps irq handler\n"); gpiopps_detach(dev); return (err); } /* Create the RFC 2783 pps-api cdev. */ make_dev_args_init(&devargs); devargs.mda_devsw = &pps_cdevsw; devargs.mda_uid = UID_ROOT; devargs.mda_gid = GID_WHEEL; devargs.mda_mode = 0660; devargs.mda_si_drv1 = sc; err = make_dev_s(&devargs, &sc->pps_cdev, PPS_CDEV_NAME "%d", device_get_unit(dev)); if (err != 0) { device_printf(dev, "Unable to create pps cdev\n"); gpiopps_detach(dev); return (err); } return (0); } static int gpiopps_fdt_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) { device_set_desc(dev, "GPIO PPS"); return (BUS_PROBE_DEFAULT); } return (ENXIO); } static device_method_t pps_fdt_methods[] = { DEVMETHOD(device_probe, gpiopps_fdt_probe), DEVMETHOD(device_attach, gpiopps_fdt_attach), DEVMETHOD(device_detach, gpiopps_detach), DEVMETHOD_END }; static driver_t pps_fdt_driver = { "gpiopps", pps_fdt_methods, sizeof(struct pps_softc), }; DRIVER_MODULE(gpiopps, simplebus, pps_fdt_driver, pps_devclass, 0, 0); #endif /* FDT */
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