The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/vybrid/vf_gpio.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 /*
   30  * Vybrid Family General-Purpose Input/Output (GPIO)
   31  * Chapter 7, Vybrid Reference Manual, Rev. 5, 07/2013
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: head/sys/arm/freescale/vybrid/vf_gpio.c 326258 2017-11-27 15:04:10Z pfg $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/bus.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 #include <sys/malloc.h>
   43 #include <sys/rman.h>
   44 #include <sys/timeet.h>
   45 #include <sys/timetc.h>
   46 #include <sys/watchdog.h>
   47 #include <sys/mutex.h>
   48 #include <sys/gpio.h>
   49 
   50 #include <dev/gpio/gpiobusvar.h>
   51 #include <dev/ofw/openfirm.h>
   52 #include <dev/ofw/ofw_bus.h>
   53 #include <dev/ofw/ofw_bus_subr.h>
   54 
   55 #include <machine/bus.h>
   56 #include <machine/cpu.h>
   57 #include <machine/intr.h>
   58 
   59 #include "gpio_if.h"
   60 
   61 #include <arm/freescale/vybrid/vf_common.h>
   62 #include <arm/freescale/vybrid/vf_port.h>
   63 
   64 #define GPIO_PDOR(n)    (0x00 + 0x40 * (n >> 5))
   65 #define GPIO_PSOR(n)    (0x04 + 0x40 * (n >> 5))
   66 #define GPIO_PCOR(n)    (0x08 + 0x40 * (n >> 5))
   67 #define GPIO_PTOR(n)    (0x0C + 0x40 * (n >> 5))
   68 #define GPIO_PDIR(n)    (0x10 + 0x40 * (n >> 5))
   69 
   70 #define GPIO_LOCK(_sc)          mtx_lock(&(_sc)->sc_mtx)
   71 #define GPIO_UNLOCK(_sc)        mtx_unlock(&(_sc)->sc_mtx)
   72 
   73 #define DEFAULT_CAPS    (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
   74 
   75 /*
   76  * GPIO interface
   77  */
   78 static device_t vf_gpio_get_bus(device_t);
   79 static int vf_gpio_pin_max(device_t, int *);
   80 static int vf_gpio_pin_getcaps(device_t, uint32_t, uint32_t *);
   81 static int vf_gpio_pin_getname(device_t, uint32_t, char *);
   82 static int vf_gpio_pin_getflags(device_t, uint32_t, uint32_t *);
   83 static int vf_gpio_pin_setflags(device_t, uint32_t, uint32_t);
   84 static int vf_gpio_pin_set(device_t, uint32_t, unsigned int);
   85 static int vf_gpio_pin_get(device_t, uint32_t, unsigned int *);
   86 static int vf_gpio_pin_toggle(device_t, uint32_t pin);
   87 
   88 struct vf_gpio_softc {
   89         struct resource         *res[1];
   90         bus_space_tag_t         bst;
   91         bus_space_handle_t      bsh;
   92 
   93         device_t                sc_busdev;
   94         struct mtx              sc_mtx;
   95         int                     gpio_npins;
   96         struct gpio_pin         gpio_pins[NGPIO];
   97 };
   98 
   99 struct vf_gpio_softc *gpio_sc;
  100 
  101 static struct resource_spec vf_gpio_spec[] = {
  102         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  103         { -1, 0 }
  104 };
  105 
  106 static int
  107 vf_gpio_probe(device_t dev)
  108 {
  109 
  110         if (!ofw_bus_status_okay(dev))
  111                 return (ENXIO);
  112 
  113         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-gpio"))
  114                 return (ENXIO);
  115 
  116         device_set_desc(dev, "Vybrid Family GPIO Unit");
  117         return (BUS_PROBE_DEFAULT);
  118 }
  119 
  120 static int
  121 vf_gpio_attach(device_t dev)
  122 {
  123         struct vf_gpio_softc *sc;
  124         int i;
  125 
  126         sc = device_get_softc(dev);
  127         mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
  128 
  129         if (bus_alloc_resources(dev, vf_gpio_spec, sc->res)) {
  130                 device_printf(dev, "could not allocate resources\n");
  131                 mtx_destroy(&sc->sc_mtx);
  132                 return (ENXIO);
  133         }
  134 
  135         /* Memory interface */
  136         sc->bst = rman_get_bustag(sc->res[0]);
  137         sc->bsh = rman_get_bushandle(sc->res[0]);
  138 
  139         gpio_sc = sc;
  140 
  141         sc->gpio_npins = NGPIO;
  142 
  143         for (i = 0; i < sc->gpio_npins; i++) {
  144                 sc->gpio_pins[i].gp_pin = i;
  145                 sc->gpio_pins[i].gp_caps = DEFAULT_CAPS;
  146                 sc->gpio_pins[i].gp_flags =
  147                     (READ4(sc, GPIO_PDOR(i)) & (1 << (i % 32))) ?
  148                     GPIO_PIN_OUTPUT: GPIO_PIN_INPUT;
  149                 snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME,
  150                     "vf_gpio%d.%d", device_get_unit(dev), i);
  151         }
  152 
  153         sc->sc_busdev = gpiobus_attach_bus(dev);
  154         if (sc->sc_busdev == NULL) {
  155                 bus_release_resources(dev, vf_gpio_spec, sc->res);
  156                 mtx_destroy(&sc->sc_mtx);
  157                 return (ENXIO);
  158         }
  159 
  160         return (0);
  161 }
  162 
  163 static device_t
  164 vf_gpio_get_bus(device_t dev)
  165 {
  166         struct vf_gpio_softc *sc;
  167 
  168         sc = device_get_softc(dev);
  169 
  170         return (sc->sc_busdev);
  171 }
  172 
  173 static int
  174 vf_gpio_pin_max(device_t dev, int *maxpin)
  175 {
  176 
  177         *maxpin = NGPIO - 1;
  178         return (0);
  179 }
  180 
  181 static int
  182 vf_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
  183 {
  184         struct vf_gpio_softc *sc;
  185         int i;
  186 
  187         sc = device_get_softc(dev);
  188         for (i = 0; i < sc->gpio_npins; i++) {
  189                 if (sc->gpio_pins[i].gp_pin == pin)
  190                         break;
  191         }
  192 
  193         if (i >= sc->gpio_npins)
  194                 return (EINVAL);
  195 
  196         GPIO_LOCK(sc);
  197         memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME);
  198         GPIO_UNLOCK(sc);
  199 
  200         return (0);
  201 }
  202 
  203 static int
  204 vf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
  205 {
  206         struct vf_gpio_softc *sc;
  207         int i;
  208 
  209         sc = device_get_softc(dev);
  210         for (i = 0; i < sc->gpio_npins; i++) {
  211                 if (sc->gpio_pins[i].gp_pin == pin)
  212                         break;
  213         }
  214 
  215         if (i >= sc->gpio_npins)
  216                 return (EINVAL);
  217 
  218         GPIO_LOCK(sc);
  219         *caps = sc->gpio_pins[i].gp_caps;
  220         GPIO_UNLOCK(sc);
  221 
  222         return (0);
  223 }
  224 
  225 static int
  226 vf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
  227 {
  228         struct vf_gpio_softc *sc;
  229         int i;
  230 
  231         sc = device_get_softc(dev);
  232         for (i = 0; i < sc->gpio_npins; i++) {
  233                 if (sc->gpio_pins[i].gp_pin == pin)
  234                         break;
  235         }
  236 
  237         if (i >= sc->gpio_npins)
  238                 return (EINVAL);
  239 
  240         GPIO_LOCK(sc);
  241         *flags = sc->gpio_pins[i].gp_flags;
  242         GPIO_UNLOCK(sc);
  243 
  244         return (0);
  245 }
  246 
  247 static int
  248 vf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
  249 {
  250         struct vf_gpio_softc *sc;
  251         int i;
  252 
  253         sc = device_get_softc(dev);
  254         for (i = 0; i < sc->gpio_npins; i++) {
  255                 if (sc->gpio_pins[i].gp_pin == pin)
  256                         break;
  257         }
  258 
  259         if (i >= sc->gpio_npins)
  260                 return (EINVAL);
  261 
  262         GPIO_LOCK(sc);
  263         *val = (READ4(sc, GPIO_PDIR(i)) & (1 << (i % 32))) ? 1 : 0;
  264         GPIO_UNLOCK(sc);
  265 
  266         return (0);
  267 }
  268 
  269 static int
  270 vf_gpio_pin_toggle(device_t dev, uint32_t pin)
  271 {
  272         struct vf_gpio_softc *sc;
  273         int i;
  274 
  275         sc = device_get_softc(dev);
  276         for (i = 0; i < sc->gpio_npins; i++) {
  277                 if (sc->gpio_pins[i].gp_pin == pin)
  278                         break;
  279         }
  280 
  281         if (i >= sc->gpio_npins)
  282                 return (EINVAL);
  283 
  284         GPIO_LOCK(sc);
  285         WRITE4(sc, GPIO_PTOR(i), (1 << (i % 32)));
  286         GPIO_UNLOCK(sc);
  287 
  288         return (0);
  289 }
  290 
  291 
  292 static void
  293 vf_gpio_pin_configure(struct vf_gpio_softc *sc, struct gpio_pin *pin,
  294     unsigned int flags)
  295 {
  296 
  297         GPIO_LOCK(sc);
  298 
  299         /*
  300          * Manage input/output
  301          */
  302         if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
  303                 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
  304                 if (flags & GPIO_PIN_OUTPUT) {
  305                         pin->gp_flags |= GPIO_PIN_OUTPUT;
  306 
  307                 } else {
  308                         pin->gp_flags |= GPIO_PIN_INPUT;
  309                         WRITE4(sc, GPIO_PCOR(pin->gp_pin),
  310                             (1 << (pin->gp_pin % 32)));
  311                 }
  312         }
  313 
  314         GPIO_UNLOCK(sc);
  315 }
  316 
  317 
  318 static int
  319 vf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
  320 {
  321         struct vf_gpio_softc *sc;
  322         int i;
  323 
  324         sc = device_get_softc(dev);
  325         for (i = 0; i < sc->gpio_npins; i++) {
  326                 if (sc->gpio_pins[i].gp_pin == pin)
  327                         break;
  328         }
  329 
  330         if (i >= sc->gpio_npins)
  331                 return (EINVAL);
  332 
  333         vf_gpio_pin_configure(sc, &sc->gpio_pins[i], flags);
  334 
  335         return (0);
  336 }
  337 
  338 static int
  339 vf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
  340 {
  341         struct vf_gpio_softc *sc;
  342         int i;
  343 
  344         sc = device_get_softc(dev);
  345         for (i = 0; i < sc->gpio_npins; i++) {
  346                 if (sc->gpio_pins[i].gp_pin == pin)
  347                         break;
  348         }
  349 
  350         if (i >= sc->gpio_npins)
  351                 return (EINVAL);
  352 
  353         GPIO_LOCK(sc);
  354         if (value)
  355                 WRITE4(sc, GPIO_PSOR(i), (1 << (i % 32)));
  356         else
  357                 WRITE4(sc, GPIO_PCOR(i), (1 << (i % 32)));
  358         GPIO_UNLOCK(sc);
  359 
  360         return (0);
  361 }
  362 
  363 static device_method_t vf_gpio_methods[] = {
  364         DEVMETHOD(device_probe,         vf_gpio_probe),
  365         DEVMETHOD(device_attach,        vf_gpio_attach),
  366 
  367         /* GPIO protocol */
  368         DEVMETHOD(gpio_get_bus,         vf_gpio_get_bus),
  369         DEVMETHOD(gpio_pin_max,         vf_gpio_pin_max),
  370         DEVMETHOD(gpio_pin_getname,     vf_gpio_pin_getname),
  371         DEVMETHOD(gpio_pin_getcaps,     vf_gpio_pin_getcaps),
  372         DEVMETHOD(gpio_pin_getflags,    vf_gpio_pin_getflags),
  373         DEVMETHOD(gpio_pin_get,         vf_gpio_pin_get),
  374         DEVMETHOD(gpio_pin_toggle,      vf_gpio_pin_toggle),
  375         DEVMETHOD(gpio_pin_setflags,    vf_gpio_pin_setflags),
  376         DEVMETHOD(gpio_pin_set,         vf_gpio_pin_set),
  377         { 0, 0 }
  378 };
  379 
  380 static driver_t vf_gpio_driver = {
  381         "gpio",
  382         vf_gpio_methods,
  383         sizeof(struct vf_gpio_softc),
  384 };
  385 
  386 static devclass_t vf_gpio_devclass;
  387 
  388 DRIVER_MODULE(vf_gpio, simplebus, vf_gpio_driver, vf_gpio_devclass, 0, 0);

Cache object: 6982063e384ef60961d568b1e36a3940


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