667357dc9b
Verify for invalid modes and unwanted flags before pass the new flags to driver.
635 lines
16 KiB
C
635 lines
16 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/gpio.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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#undef GPIOBUS_DEBUG
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#ifdef GPIOBUS_DEBUG
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#define dprintf printf
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#else
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#define dprintf(x, arg...)
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#endif
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static void gpiobus_print_pins(struct gpiobus_ivar *, char *, size_t);
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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 int gpiobus_acquire_bus(device_t, device_t, int);
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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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int
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gpio_check_flags(uint32_t caps, uint32_t flags)
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{
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/* Check for unwanted flags. */
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if ((flags & caps) == 0 || (flags & caps) != flags)
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return (EINVAL);
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/* Cannot mix input/output together. */
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if (flags & GPIO_PIN_INPUT && flags & GPIO_PIN_OUTPUT)
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return (EINVAL);
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/* Cannot mix pull-up/pull-down together. */
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if (flags & GPIO_PIN_PULLUP && flags & GPIO_PIN_PULLDOWN)
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return (EINVAL);
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return (0);
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}
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static void
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gpiobus_print_pins(struct gpiobus_ivar *devi, char *buf, size_t buflen)
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{
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char tmp[128];
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int i, range_start, range_stop, need_coma;
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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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strlcat(buf, ",", buflen);
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memset(tmp, 0, sizeof(tmp));
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if (range_start != range_stop)
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snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
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range_start, range_stop);
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else
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snprintf(tmp, sizeof(tmp) - 1, "%d",
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range_start);
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strlcat(buf, tmp, buflen);
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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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strlcat(buf, ",", buflen);
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memset(tmp, 0, sizeof(tmp));
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if (range_start != range_stop)
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snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
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range_start, range_stop);
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else
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snprintf(tmp, sizeof(tmp) - 1, "%d",
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range_start);
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strlcat(buf, tmp, buflen);
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}
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int
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gpiobus_init_softc(device_t dev)
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{
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struct gpiobus_softc *sc;
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sc = GPIOBUS_SOFTC(dev);
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sc->sc_busdev = dev;
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sc->sc_dev = device_get_parent(dev);
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sc->sc_intr_rman.rm_type = RMAN_ARRAY;
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sc->sc_intr_rman.rm_descr = "GPIO Interrupts";
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if (rman_init(&sc->sc_intr_rman) != 0 ||
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rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0)
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panic("%s: failed to set up rman.", __func__);
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if (GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins) != 0)
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return (ENXIO);
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KASSERT(sc->sc_npins != 0, ("GPIO device with no pins"));
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/* Pins = GPIO_PIN_MAX() + 1 */
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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 == NULL)
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return (ENOMEM);
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/* Initialize the bus lock. */
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GPIOBUS_LOCK_INIT(sc);
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return (0);
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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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int err;
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err = gpiobus_init_softc(dev);
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if (err != 0)
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return (err);
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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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char pins[128];
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int retval = 0;
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struct gpiobus_ivar *devi;
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devi = GPIOBUS_IVAR(child);
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memset(pins, 0, sizeof(pins));
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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, pins, sizeof(pins));
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retval += printf("%s", pins);
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resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%ld");
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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;
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devi = GPIOBUS_IVAR(child);
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strlcpy(buf, "pin(s)=", buflen);
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gpiobus_print_pins(devi, buf, buflen);
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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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resource_list_init(&devi->rl);
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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 irq, 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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if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
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if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0)
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device_printf(bus,
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"warning: bus_set_resource() failed\n");
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}
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}
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static int
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gpiobus_set_resource(device_t dev, device_t child, int type, int rid,
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u_long start, u_long count)
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{
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struct gpiobus_ivar *devi;
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struct resource_list_entry *rle;
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dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n",
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__func__, dev, child, type, rid, (void *)(intptr_t)start, count);
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devi = GPIOBUS_IVAR(child);
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rle = resource_list_add(&devi->rl, type, rid, start,
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start + count - 1, count);
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if (rle == NULL)
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return (ENXIO);
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return (0);
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}
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static struct resource *
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gpiobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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struct gpiobus_softc *sc;
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struct resource *rv;
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struct resource_list *rl;
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struct resource_list_entry *rle;
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int isdefault;
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if (type != SYS_RES_IRQ)
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return (NULL);
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isdefault = (start == 0UL && end == ~0UL && count == 1);
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rle = NULL;
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if (isdefault) {
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rl = BUS_GET_RESOURCE_LIST(bus, child);
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if (rl == NULL)
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return (NULL);
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rle = resource_list_find(rl, type, *rid);
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if (rle == NULL)
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return (NULL);
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if (rle->res != NULL)
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panic("%s: resource entry is busy", __func__);
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start = rle->start;
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count = rle->count;
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end = rle->end;
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}
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sc = device_get_softc(bus);
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rv = rman_reserve_resource(&sc->sc_intr_rman, start, end, count, flags,
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child);
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if (rv == NULL)
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return (NULL);
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rman_set_rid(rv, *rid);
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if ((flags & RF_ACTIVE) != 0 &&
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bus_activate_resource(child, type, *rid, rv) != 0) {
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rman_release_resource(rv);
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return (NULL);
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}
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return (rv);
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}
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static int
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gpiobus_release_resource(device_t bus __unused, device_t child, int type,
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int rid, struct resource *r)
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{
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int error;
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if (rman_get_flags(r) & RF_ACTIVE) {
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error = bus_deactivate_resource(child, type, rid, r);
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if (error)
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return (error);
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}
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return (rman_release_resource(r));
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}
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static struct resource_list *
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gpiobus_get_resource_list(device_t bus __unused, device_t child)
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{
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struct gpiobus_ivar *ivar;
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ivar = GPIOBUS_IVAR(child);
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return (&ivar->rl);
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}
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static int
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gpiobus_acquire_bus(device_t busdev, device_t child, int how)
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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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if (sc->sc_owner != NULL) {
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if (how == GPIOBUS_DONTWAIT) {
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GPIOBUS_UNLOCK(sc);
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return (EWOULDBLOCK);
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}
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while (sc->sc_owner != NULL)
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mtx_sleep(sc, &sc->sc_mtx, 0, "gpiobuswait", 0);
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}
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sc->sc_owner = child;
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GPIOBUS_UNLOCK(sc);
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return (0);
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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_UNLOCKED(sc);
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GPIOBUS_LOCK(sc);
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if (sc->sc_owner == NULL)
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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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wakeup(sc);
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GPIOBUS_UNLOCK(sc);
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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);
|
|
uint32_t caps;
|
|
|
|
if (pin >= devi->npins)
|
|
return (EINVAL);
|
|
if (GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], &caps) != 0)
|
|
return (EINVAL);
|
|
if (gpio_check_flags(caps, flags) != 0)
|
|
return (EINVAL);
|
|
|
|
return (GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags));
|
|
}
|
|
|
|
static int
|
|
gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin,
|
|
uint32_t *flags)
|
|
{
|
|
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
|
|
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
|
|
|
|
if (pin >= devi->npins)
|
|
return (EINVAL);
|
|
|
|
return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags);
|
|
}
|
|
|
|
static int
|
|
gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin,
|
|
uint32_t *caps)
|
|
{
|
|
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
|
|
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
|
|
|
|
if (pin >= devi->npins)
|
|
return (EINVAL);
|
|
|
|
return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps);
|
|
}
|
|
|
|
static int
|
|
gpiobus_pin_set(device_t dev, device_t child, uint32_t pin,
|
|
unsigned int value)
|
|
{
|
|
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
|
|
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
|
|
|
|
if (pin >= devi->npins)
|
|
return (EINVAL);
|
|
|
|
return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value);
|
|
}
|
|
|
|
static int
|
|
gpiobus_pin_get(device_t dev, device_t child, uint32_t pin,
|
|
unsigned int *value)
|
|
{
|
|
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
|
|
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
|
|
|
|
if (pin >= devi->npins)
|
|
return (EINVAL);
|
|
|
|
return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value);
|
|
}
|
|
|
|
static int
|
|
gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin)
|
|
{
|
|
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
|
|
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
|
|
|
|
if (pin >= devi->npins)
|
|
return (EINVAL);
|
|
|
|
return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]);
|
|
}
|
|
|
|
static device_method_t gpiobus_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, gpiobus_probe),
|
|
DEVMETHOD(device_attach, gpiobus_attach),
|
|
DEVMETHOD(device_detach, gpiobus_detach),
|
|
DEVMETHOD(device_shutdown, bus_generic_shutdown),
|
|
DEVMETHOD(device_suspend, gpiobus_suspend),
|
|
DEVMETHOD(device_resume, gpiobus_resume),
|
|
|
|
/* Bus interface */
|
|
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
|
|
DEVMETHOD(bus_config_intr, bus_generic_config_intr),
|
|
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
|
|
DEVMETHOD(bus_set_resource, gpiobus_set_resource),
|
|
DEVMETHOD(bus_alloc_resource, gpiobus_alloc_resource),
|
|
DEVMETHOD(bus_release_resource, gpiobus_release_resource),
|
|
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
|
|
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
|
|
DEVMETHOD(bus_get_resource_list, gpiobus_get_resource_list),
|
|
DEVMETHOD(bus_add_child, gpiobus_add_child),
|
|
DEVMETHOD(bus_print_child, gpiobus_print_child),
|
|
DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str),
|
|
DEVMETHOD(bus_child_location_str, gpiobus_child_location_str),
|
|
DEVMETHOD(bus_hinted_child, gpiobus_hinted_child),
|
|
|
|
/* GPIO protocol */
|
|
DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus),
|
|
DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus),
|
|
DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags),
|
|
DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps),
|
|
DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags),
|
|
DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get),
|
|
DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set),
|
|
DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
driver_t gpiobus_driver = {
|
|
"gpiobus",
|
|
gpiobus_methods,
|
|
sizeof(struct gpiobus_softc)
|
|
};
|
|
|
|
devclass_t gpiobus_devclass;
|
|
|
|
DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0);
|
|
MODULE_VERSION(gpiobus, 1);
|