487 lines
12 KiB
C
487 lines
12 KiB
C
/*-
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* Copyright (c) 2009 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/malloc.h>
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#include <sys/module.h>
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#include <dev/gpio/gpiobusvar.h>
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#include "gpiobus_if.h"
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static int gpiobus_parse_pins(struct gpiobus_softc *, device_t, int);
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static int gpiobus_probe(device_t);
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static int gpiobus_attach(device_t);
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static int gpiobus_detach(device_t);
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static int gpiobus_suspend(device_t);
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static int gpiobus_resume(device_t);
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static int gpiobus_print_child(device_t, device_t);
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static int gpiobus_child_location_str(device_t, device_t, char *, size_t);
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static int gpiobus_child_pnpinfo_str(device_t, device_t, char *, size_t);
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static device_t gpiobus_add_child(device_t, u_int, const char *, int);
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static void gpiobus_hinted_child(device_t, const char *, int);
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/*
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* GPIOBUS interface
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*/
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static void gpiobus_lock_bus(device_t);
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static void gpiobus_unlock_bus(device_t);
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static void gpiobus_acquire_bus(device_t, device_t);
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static void gpiobus_release_bus(device_t, device_t);
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static int gpiobus_pin_setflags(device_t, device_t, uint32_t, uint32_t);
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static int gpiobus_pin_getflags(device_t, device_t, uint32_t, uint32_t*);
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static int gpiobus_pin_getcaps(device_t, device_t, uint32_t, uint32_t*);
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static int gpiobus_pin_set(device_t, device_t, uint32_t, unsigned int);
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static int gpiobus_pin_get(device_t, device_t, uint32_t, unsigned int*);
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static int gpiobus_pin_toggle(device_t, device_t, uint32_t);
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void
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gpiobus_print_pins(struct gpiobus_ivar *devi)
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{
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int range_start, range_stop, need_coma;
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int i;
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if (devi->npins == 0)
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return;
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need_coma = 0;
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range_start = range_stop = devi->pins[0];
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for (i = 1; i < devi->npins; i++) {
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if (devi->pins[i] != (range_stop + 1)) {
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if (need_coma)
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printf(",");
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if (range_start != range_stop)
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printf("%d-%d", range_start, range_stop);
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else
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printf("%d", range_start);
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range_start = range_stop = devi->pins[i];
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need_coma = 1;
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}
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else
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range_stop++;
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}
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if (need_coma)
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printf(",");
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if (range_start != range_stop)
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printf("%d-%d", range_start, range_stop);
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else
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printf("%d", range_start);
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}
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static int
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gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask)
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{
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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int i, npins;
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npins = 0;
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for (i = 0; i < 32; i++) {
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if (mask & (1 << i))
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npins++;
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}
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if (npins == 0) {
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device_printf(child, "empty pin mask\n");
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return (EINVAL);
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}
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devi->npins = npins;
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devi->pins = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (!devi->pins)
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return (ENOMEM);
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npins = 0;
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for (i = 0; i < 32; i++) {
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if ((mask & (1 << i)) == 0)
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continue;
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if (i >= sc->sc_npins) {
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device_printf(child,
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"invalid pin %d, max: %d\n", i, sc->sc_npins - 1);
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free(devi->pins, M_DEVBUF);
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return (EINVAL);
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}
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devi->pins[npins++] = i;
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/*
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* Mark pin as mapped and give warning if it's already mapped
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*/
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if (sc->sc_pins_mapped[i]) {
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device_printf(child,
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"warning: pin %d is already mapped\n", i);
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free(devi->pins, M_DEVBUF);
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return (EINVAL);
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}
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sc->sc_pins_mapped[i] = 1;
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}
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return (0);
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}
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static int
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gpiobus_probe(device_t dev)
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{
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device_set_desc(dev, "GPIO bus");
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return (BUS_PROBE_GENERIC);
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}
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static int
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gpiobus_attach(device_t dev)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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int res;
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sc->sc_busdev = dev;
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sc->sc_dev = device_get_parent(dev);
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res = GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins);
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if (res)
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return (ENXIO);
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KASSERT(sc->sc_npins != 0, ("GPIO device with no pins"));
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/*
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* Increase to get number of pins
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*/
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sc->sc_npins++;
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sc->sc_pins_mapped = malloc(sizeof(int) * sc->sc_npins, M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (!sc->sc_pins_mapped)
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return (ENOMEM);
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/* init bus lock */
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GPIOBUS_LOCK_INIT(sc);
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/*
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* Get parent's pins and mark them as unmapped
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*/
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bus_generic_probe(dev);
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bus_enumerate_hinted_children(dev);
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return (bus_generic_attach(dev));
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}
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/*
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* Since this is not a self-enumerating bus, and since we always add
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* children in attach, we have to always delete children here.
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*/
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static int
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gpiobus_detach(device_t dev)
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{
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struct gpiobus_softc *sc;
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struct gpiobus_ivar *devi;
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device_t *devlist;
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int i, err, ndevs;
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sc = GPIOBUS_SOFTC(dev);
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KASSERT(mtx_initialized(&sc->sc_mtx),
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("gpiobus mutex not initialized"));
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GPIOBUS_LOCK_DESTROY(sc);
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if ((err = bus_generic_detach(dev)) != 0)
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return (err);
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if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
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return (err);
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for (i = 0; i < ndevs; i++) {
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device_delete_child(dev, devlist[i]);
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devi = GPIOBUS_IVAR(devlist[i]);
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if (devi->pins) {
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free(devi->pins, M_DEVBUF);
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devi->pins = NULL;
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}
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}
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free(devlist, M_TEMP);
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if (sc->sc_pins_mapped) {
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free(sc->sc_pins_mapped, M_DEVBUF);
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sc->sc_pins_mapped = NULL;
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}
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return (0);
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}
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static int
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gpiobus_suspend(device_t dev)
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{
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return (bus_generic_suspend(dev));
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}
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static int
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gpiobus_resume(device_t dev)
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{
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return (bus_generic_resume(dev));
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}
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static int
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gpiobus_print_child(device_t dev, device_t child)
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{
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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int retval = 0;
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retval += bus_print_child_header(dev, child);
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retval += printf(" at pin(s) ");
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gpiobus_print_pins(devi);
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retval += bus_print_child_footer(dev, child);
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return (retval);
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}
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static int
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gpiobus_child_location_str(device_t bus, device_t child, char *buf,
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size_t buflen)
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{
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snprintf(buf, buflen, "pins=?");
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return (0);
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}
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static int
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gpiobus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
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size_t buflen)
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{
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*buf = '\0';
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return (0);
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}
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static device_t
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gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
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{
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device_t child;
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struct gpiobus_ivar *devi;
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child = device_add_child_ordered(dev, order, name, unit);
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if (child == NULL)
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return (child);
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devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
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if (devi == NULL) {
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device_delete_child(dev, child);
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return (0);
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}
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device_set_ivars(child, devi);
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return (child);
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}
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static void
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gpiobus_hinted_child(device_t bus, const char *dname, int dunit)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus);
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struct gpiobus_ivar *devi;
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device_t child;
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int pins;
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child = BUS_ADD_CHILD(bus, 0, dname, dunit);
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devi = GPIOBUS_IVAR(child);
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resource_int_value(dname, dunit, "pins", &pins);
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if (gpiobus_parse_pins(sc, child, pins))
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device_delete_child(bus, child);
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}
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static void
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gpiobus_lock_bus(device_t busdev)
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{
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struct gpiobus_softc *sc;
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sc = device_get_softc(busdev);
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GPIOBUS_ASSERT_UNLOCKED(sc);
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GPIOBUS_LOCK(sc);
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}
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static void
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gpiobus_unlock_bus(device_t busdev)
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{
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struct gpiobus_softc *sc;
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sc = device_get_softc(busdev);
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GPIOBUS_ASSERT_LOCKED(sc);
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GPIOBUS_UNLOCK(sc);
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}
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static void
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gpiobus_acquire_bus(device_t busdev, device_t child)
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{
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struct gpiobus_softc *sc;
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sc = device_get_softc(busdev);
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GPIOBUS_ASSERT_LOCKED(sc);
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if (sc->sc_owner)
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panic("gpiobus: cannot serialize the access to device.");
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sc->sc_owner = child;
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}
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static void
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gpiobus_release_bus(device_t busdev, device_t child)
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{
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struct gpiobus_softc *sc;
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sc = device_get_softc(busdev);
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GPIOBUS_ASSERT_LOCKED(sc);
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if (!sc->sc_owner)
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panic("gpiobus: releasing unowned bus.");
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if (sc->sc_owner != child)
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panic("gpiobus: you don't own the bus. game over.");
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sc->sc_owner = NULL;
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}
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static int
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gpiobus_pin_setflags(device_t dev, device_t child, uint32_t pin,
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uint32_t flags)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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if (pin >= devi->npins)
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return (EINVAL);
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return GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags);
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}
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static int
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gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin,
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uint32_t *flags)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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if (pin >= devi->npins)
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return (EINVAL);
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return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags);
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}
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static int
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gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin,
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uint32_t *caps)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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if (pin >= devi->npins)
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return (EINVAL);
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return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps);
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}
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static int
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gpiobus_pin_set(device_t dev, device_t child, uint32_t pin,
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unsigned int value)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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if (pin >= devi->npins)
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return (EINVAL);
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return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value);
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}
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static int
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gpiobus_pin_get(device_t dev, device_t child, uint32_t pin,
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unsigned int *value)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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if (pin >= devi->npins)
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return (EINVAL);
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return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value);
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}
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static int
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gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin)
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{
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struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
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struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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if (pin >= devi->npins)
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return (EINVAL);
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return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]);
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}
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static device_method_t gpiobus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, gpiobus_probe),
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DEVMETHOD(device_attach, gpiobus_attach),
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DEVMETHOD(device_detach, gpiobus_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, gpiobus_suspend),
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DEVMETHOD(device_resume, gpiobus_resume),
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/* Bus interface */
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DEVMETHOD(bus_add_child, gpiobus_add_child),
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DEVMETHOD(bus_print_child, gpiobus_print_child),
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DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str),
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DEVMETHOD(bus_child_location_str, gpiobus_child_location_str),
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DEVMETHOD(bus_hinted_child, gpiobus_hinted_child),
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/* GPIO protocol */
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DEVMETHOD(gpiobus_lock_bus, gpiobus_lock_bus),
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DEVMETHOD(gpiobus_unlock_bus, gpiobus_unlock_bus),
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DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus),
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DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus),
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DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags),
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DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps),
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DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags),
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DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get),
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DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set),
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DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle),
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DEVMETHOD_END
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};
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driver_t gpiobus_driver = {
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"gpiobus",
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gpiobus_methods,
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sizeof(struct gpiobus_softc)
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};
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devclass_t gpiobus_devclass;
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DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0);
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MODULE_VERSION(gpiobus, 1);
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