388 lines
8.7 KiB
C
388 lines
8.7 KiB
C
/*-
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* Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
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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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/*
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* Vybrid Family General-Purpose Input/Output (GPIO)
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* Chapter 7, Vybrid Reference Manual, Rev. 5, 07/2013
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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/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <sys/timetc.h>
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#include <sys/watchdog.h>
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#include <sys/mutex.h>
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#include <sys/gpio.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include "gpio_if.h"
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#include <arm/freescale/vybrid/vf_common.h>
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#include <arm/freescale/vybrid/vf_port.h>
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#define GPIO_PDOR(n) (0x00 + 0x40 * (n >> 5))
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#define GPIO_PSOR(n) (0x04 + 0x40 * (n >> 5))
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#define GPIO_PCOR(n) (0x08 + 0x40 * (n >> 5))
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#define GPIO_PTOR(n) (0x0C + 0x40 * (n >> 5))
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#define GPIO_PDIR(n) (0x10 + 0x40 * (n >> 5))
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#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
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/*
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* GPIO interface
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*/
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static device_t vf_gpio_get_bus(device_t);
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static int vf_gpio_pin_max(device_t, int *);
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static int vf_gpio_pin_getcaps(device_t, uint32_t, uint32_t *);
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static int vf_gpio_pin_getname(device_t, uint32_t, char *);
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static int vf_gpio_pin_getflags(device_t, uint32_t, uint32_t *);
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static int vf_gpio_pin_setflags(device_t, uint32_t, uint32_t);
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static int vf_gpio_pin_set(device_t, uint32_t, unsigned int);
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static int vf_gpio_pin_get(device_t, uint32_t, unsigned int *);
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static int vf_gpio_pin_toggle(device_t, uint32_t pin);
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struct vf_gpio_softc {
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struct resource *res[1];
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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device_t sc_busdev;
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struct mtx sc_mtx;
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int gpio_npins;
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struct gpio_pin gpio_pins[NGPIO];
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};
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struct vf_gpio_softc *gpio_sc;
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static struct resource_spec vf_gpio_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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static int
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vf_gpio_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "fsl,mvf600-gpio"))
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return (ENXIO);
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device_set_desc(dev, "Vybrid Family GPIO Unit");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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vf_gpio_attach(device_t dev)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
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if (bus_alloc_resources(dev, vf_gpio_spec, sc->res)) {
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device_printf(dev, "could not allocate resources\n");
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mtx_destroy(&sc->sc_mtx);
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return (ENXIO);
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}
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/* Memory interface */
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sc->bst = rman_get_bustag(sc->res[0]);
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sc->bsh = rman_get_bushandle(sc->res[0]);
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gpio_sc = sc;
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sc->gpio_npins = NGPIO;
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for (i = 0; i < sc->gpio_npins; i++) {
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sc->gpio_pins[i].gp_pin = i;
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sc->gpio_pins[i].gp_caps = DEFAULT_CAPS;
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sc->gpio_pins[i].gp_flags =
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(READ4(sc, GPIO_PDOR(i)) & (1 << (i % 32))) ?
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GPIO_PIN_OUTPUT: GPIO_PIN_INPUT;
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snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME,
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"vf_gpio%d.%d", device_get_unit(dev), i);
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}
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sc->sc_busdev = gpiobus_attach_bus(dev);
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if (sc->sc_busdev == NULL) {
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bus_release_resources(dev, vf_gpio_spec, sc->res);
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mtx_destroy(&sc->sc_mtx);
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return (ENXIO);
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}
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return (0);
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}
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static device_t
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vf_gpio_get_bus(device_t dev)
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{
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struct vf_gpio_softc *sc;
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sc = device_get_softc(dev);
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return (sc->sc_busdev);
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}
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static int
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vf_gpio_pin_max(device_t dev, int *maxpin)
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{
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*maxpin = NGPIO - 1;
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return (0);
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}
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static int
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vf_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME);
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GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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vf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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*caps = sc->gpio_pins[i].gp_caps;
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GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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vf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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*flags = sc->gpio_pins[i].gp_flags;
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GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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vf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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*val = (READ4(sc, GPIO_PDIR(i)) & (1 << (i % 32))) ? 1 : 0;
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GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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vf_gpio_pin_toggle(device_t dev, uint32_t pin)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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WRITE4(sc, GPIO_PTOR(i), (1 << (i % 32)));
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GPIO_UNLOCK(sc);
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return (0);
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}
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static void
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vf_gpio_pin_configure(struct vf_gpio_softc *sc, struct gpio_pin *pin,
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unsigned int flags)
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{
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GPIO_LOCK(sc);
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/*
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* Manage input/output
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*/
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if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
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pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
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if (flags & GPIO_PIN_OUTPUT) {
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pin->gp_flags |= GPIO_PIN_OUTPUT;
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} else {
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pin->gp_flags |= GPIO_PIN_INPUT;
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WRITE4(sc, GPIO_PCOR(pin->gp_pin),
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(1 << (pin->gp_pin % 32)));
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}
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}
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GPIO_UNLOCK(sc);
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}
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static int
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vf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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vf_gpio_pin_configure(sc, &sc->gpio_pins[i], flags);
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return (0);
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}
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static int
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vf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct vf_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < sc->gpio_npins; i++) {
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if (sc->gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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if (value)
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WRITE4(sc, GPIO_PSOR(i), (1 << (i % 32)));
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else
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WRITE4(sc, GPIO_PCOR(i), (1 << (i % 32)));
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GPIO_UNLOCK(sc);
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return (0);
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}
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static device_method_t vf_gpio_methods[] = {
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DEVMETHOD(device_probe, vf_gpio_probe),
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DEVMETHOD(device_attach, vf_gpio_attach),
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/* GPIO protocol */
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DEVMETHOD(gpio_get_bus, vf_gpio_get_bus),
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DEVMETHOD(gpio_pin_max, vf_gpio_pin_max),
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DEVMETHOD(gpio_pin_getname, vf_gpio_pin_getname),
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DEVMETHOD(gpio_pin_getcaps, vf_gpio_pin_getcaps),
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DEVMETHOD(gpio_pin_getflags, vf_gpio_pin_getflags),
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DEVMETHOD(gpio_pin_get, vf_gpio_pin_get),
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DEVMETHOD(gpio_pin_toggle, vf_gpio_pin_toggle),
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DEVMETHOD(gpio_pin_setflags, vf_gpio_pin_setflags),
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DEVMETHOD(gpio_pin_set, vf_gpio_pin_set),
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{ 0, 0 }
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};
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static driver_t vf_gpio_driver = {
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"gpio",
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vf_gpio_methods,
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sizeof(struct vf_gpio_softc),
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};
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static devclass_t vf_gpio_devclass;
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DRIVER_MODULE(vf_gpio, simplebus, vf_gpio_driver, vf_gpio_devclass, 0, 0);
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