c08375b9a1
The external gpio pins are connected to a PLD on the i2c bus, unfortunatley this device does not conform by failing to send an ack after each byte written. The iicbb driver will abort the transfer when the address is not ack'd and it would introduce a lot of churn to be able to pass a flag down to iicbb_start/iicbb_write. Instead we do bad things by grabbing the iicbus but then doing our own bit banging.
494 lines
12 KiB
C
494 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/malloc.h>
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#include <sys/module.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <sys/gpio.h>
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#include <dev/gpio/gpiobusvar.h>
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#include "gpio_if.h"
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#include "gpiobus_if.h"
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static void gpiobus_print_pins(struct gpiobus_ivar *);
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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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#define GPIOBUS_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define GPIOBUS_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define GPIOBUS_LOCK_INIT(_sc) \
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mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
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"gpiobus", MTX_DEF)
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#define GPIOBUS_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
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#define GPIOBUS_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
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#define GPIOBUS_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
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static 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");
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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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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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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 (0);
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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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/*
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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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KASSERT(sc->sc_npins != 0, ("GPIO device with no pins"));
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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_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 = GPIOBUS_SOFTC(dev);
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int err, ndevs, i;
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device_t *devlist;
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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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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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free(devlist, M_TEMP);
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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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// struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
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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("rb_cpldbus: 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("rb_cpldbus: releasing unowned bus.");
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if (sc->sc_owner != child)
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panic("rb_cpldbus: 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_driver_added, bus_generic_driver_added),
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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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{ 0, 0 }
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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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