vf_gpio.c

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    1 /*-
    2  * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * Vybrid Family General-Purpose Input/Output (GPIO)
   29  * Chapter 7, Vybrid Reference Manual, Rev. 5, 07/2013
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/vybrid/vf_gpio.c 281085 2015-04-04 21:34:26Z andrew $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/malloc.h>
   41 #include <sys/rman.h>
   42 #include <sys/timeet.h>
   43 #include <sys/timetc.h>
   44 #include <sys/watchdog.h>
   45 #include <sys/mutex.h>
   46 #include <sys/gpio.h>
   47 
   48 #include <dev/fdt/fdt_common.h>
   49 #include <dev/gpio/gpiobusvar.h>
   50 #include <dev/ofw/openfirm.h>
   51 #include <dev/ofw/ofw_bus.h>
   52 #include <dev/ofw/ofw_bus_subr.h>
   53 
   54 #include <machine/bus.h>
   55 #include <machine/cpu.h>
   56 #include <machine/intr.h>
   57 
   58 #include "gpio_if.h"
   59 
   60 #include <arm/freescale/vybrid/vf_common.h>
   61 #include <arm/freescale/vybrid/vf_port.h>
   62 
   63 #define GPIO_PDOR(n)    (0x00 + 0x40 * (n >> 5))
   64 #define GPIO_PSOR(n)    (0x04 + 0x40 * (n >> 5))
   65 #define GPIO_PCOR(n)    (0x08 + 0x40 * (n >> 5))
   66 #define GPIO_PTOR(n)    (0x0C + 0x40 * (n >> 5))
   67 #define GPIO_PDIR(n)    (0x10 + 0x40 * (n >> 5))
   68 
   69 #define GPIO_LOCK(_sc)          mtx_lock(&(_sc)->sc_mtx)
   70 #define GPIO_UNLOCK(_sc)        mtx_unlock(&(_sc)->sc_mtx)
   71 
   72 #define DEFAULT_CAPS    (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
   73 
   74 /*
   75  * GPIO interface
   76  */
   77 static device_t vf_gpio_get_bus(device_t);
   78 static int vf_gpio_pin_max(device_t, int *);
   79 static int vf_gpio_pin_getcaps(device_t, uint32_t, uint32_t *);
   80 static int vf_gpio_pin_getname(device_t, uint32_t, char *);
   81 static int vf_gpio_pin_getflags(device_t, uint32_t, uint32_t *);
   82 static int vf_gpio_pin_setflags(device_t, uint32_t, uint32_t);
   83 static int vf_gpio_pin_set(device_t, uint32_t, unsigned int);
   84 static int vf_gpio_pin_get(device_t, uint32_t, unsigned int *);
   85 static int vf_gpio_pin_toggle(device_t, uint32_t pin);
   86 
   87 struct vf_gpio_softc {
   88         struct resource         *res[1];
   89         bus_space_tag_t         bst;
   90         bus_space_handle_t      bsh;
   91 
   92         device_t                sc_busdev;
   93         struct mtx              sc_mtx;
   94         int                     gpio_npins;
   95         struct gpio_pin         gpio_pins[NGPIO];
   96 };
   97 
   98 struct vf_gpio_softc *gpio_sc;
   99 
  100 static struct resource_spec vf_gpio_spec[] = {
  101         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  102         { -1, 0 }
  103 };
  104 
  105 static int
  106 vf_gpio_probe(device_t dev)
  107 {
  108 
  109         if (!ofw_bus_status_okay(dev))
  110                 return (ENXIO);
  111 
  112         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-gpio"))
  113                 return (ENXIO);
  114 
  115         device_set_desc(dev, "Vybrid Family GPIO Unit");
  116         return (BUS_PROBE_DEFAULT);
  117 }
  118 
  119 static int
  120 vf_gpio_attach(device_t dev)
  121 {
  122         struct vf_gpio_softc *sc;
  123         int i;
  124 
  125         sc = device_get_softc(dev);
  126         mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
  127 
  128         if (bus_alloc_resources(dev, vf_gpio_spec, sc->res)) {
  129                 device_printf(dev, "could not allocate resources\n");
  130                 mtx_destroy(&sc->sc_mtx);
  131                 return (ENXIO);
  132         }
  133 
  134         /* Memory interface */
  135         sc->bst = rman_get_bustag(sc->res[0]);
  136         sc->bsh = rman_get_bushandle(sc->res[0]);
  137 
  138         gpio_sc = sc;
  139 
  140         sc->gpio_npins = NGPIO;
  141 
  142         for (i = 0; i < sc->gpio_npins; i++) {
  143                 sc->gpio_pins[i].gp_pin = i;
  144                 sc->gpio_pins[i].gp_caps = DEFAULT_CAPS;
  145                 sc->gpio_pins[i].gp_flags =
  146                     (READ4(sc, GPIO_PDOR(i)) & (1 << (i % 32))) ?
  147                     GPIO_PIN_OUTPUT: GPIO_PIN_INPUT;
  148                 snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME,
  149                     "vf_gpio%d.%d", device_get_unit(dev), i);
  150         }
  151 
  152         sc->sc_busdev = gpiobus_attach_bus(dev);
  153         if (sc->sc_busdev == NULL) {
  154                 bus_release_resources(dev, vf_gpio_spec, sc->res);
  155                 mtx_destroy(&sc->sc_mtx);
  156                 return (ENXIO);
  157         }
  158 
  159         return (0);
  160 }
  161 
  162 static device_t
  163 vf_gpio_get_bus(device_t dev)
  164 {
  165         struct vf_gpio_softc *sc;
  166 
  167         sc = device_get_softc(dev);
  168 
  169         return (sc->sc_busdev);
  170 }
  171 
  172 static int
  173 vf_gpio_pin_max(device_t dev, int *maxpin)
  174 {
  175 
  176         *maxpin = NGPIO - 1;
  177         return (0);
  178 }
  179 
  180 static int
  181 vf_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
  182 {
  183         struct vf_gpio_softc *sc;
  184         int i;
  185 
  186         sc = device_get_softc(dev);
  187         for (i = 0; i < sc->gpio_npins; i++) {
  188                 if (sc->gpio_pins[i].gp_pin == pin)
  189                         break;
  190         }
  191 
  192         if (i >= sc->gpio_npins)
  193                 return (EINVAL);
  194 
  195         GPIO_LOCK(sc);
  196         memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME);
  197         GPIO_UNLOCK(sc);
  198 
  199         return (0);
  200 }
  201 
  202 static int
  203 vf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
  204 {
  205         struct vf_gpio_softc *sc;
  206         int i;
  207 
  208         sc = device_get_softc(dev);
  209         for (i = 0; i < sc->gpio_npins; i++) {
  210                 if (sc->gpio_pins[i].gp_pin == pin)
  211                         break;
  212         }
  213 
  214         if (i >= sc->gpio_npins)
  215                 return (EINVAL);
  216 
  217         GPIO_LOCK(sc);
  218         *caps = sc->gpio_pins[i].gp_caps;
  219         GPIO_UNLOCK(sc);
  220 
  221         return (0);
  222 }
  223 
  224 static int
  225 vf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
  226 {
  227         struct vf_gpio_softc *sc;
  228         int i;
  229 
  230         sc = device_get_softc(dev);
  231         for (i = 0; i < sc->gpio_npins; i++) {
  232                 if (sc->gpio_pins[i].gp_pin == pin)
  233                         break;
  234         }
  235 
  236         if (i >= sc->gpio_npins)
  237                 return (EINVAL);
  238 
  239         GPIO_LOCK(sc);
  240         *flags = sc->gpio_pins[i].gp_flags;
  241         GPIO_UNLOCK(sc);
  242 
  243         return (0);
  244 }
  245 
  246 static int
  247 vf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
  248 {
  249         struct vf_gpio_softc *sc;
  250         int i;
  251 
  252         sc = device_get_softc(dev);
  253         for (i = 0; i < sc->gpio_npins; i++) {
  254                 if (sc->gpio_pins[i].gp_pin == pin)
  255                         break;
  256         }
  257 
  258         if (i >= sc->gpio_npins)
  259                 return (EINVAL);
  260 
  261         GPIO_LOCK(sc);
  262         *val = (READ4(sc, GPIO_PDIR(i)) & (1 << (i % 32))) ? 1 : 0;
  263         GPIO_UNLOCK(sc);
  264 
  265         return (0);
  266 }
  267 
  268 static int
  269 vf_gpio_pin_toggle(device_t dev, uint32_t pin)
  270 {
  271         struct vf_gpio_softc *sc;
  272         int i;
  273 
  274         sc = device_get_softc(dev);
  275         for (i = 0; i < sc->gpio_npins; i++) {
  276                 if (sc->gpio_pins[i].gp_pin == pin)
  277                         break;
  278         }
  279 
  280         if (i >= sc->gpio_npins)
  281                 return (EINVAL);
  282 
  283         GPIO_LOCK(sc);
  284         WRITE4(sc, GPIO_PTOR(i), (1 << (i % 32)));
  285         GPIO_UNLOCK(sc);
  286 
  287         return (0);
  288 }
  289 
  290 
  291 static void
  292 vf_gpio_pin_configure(struct vf_gpio_softc *sc, struct gpio_pin *pin,
  293     unsigned int flags)
  294 {
  295 
  296         GPIO_LOCK(sc);
  297 
  298         /*
  299          * Manage input/output
  300          */
  301         if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
  302                 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
  303                 if (flags & GPIO_PIN_OUTPUT) {
  304                         pin->gp_flags |= GPIO_PIN_OUTPUT;
  305 
  306                 } else {
  307                         pin->gp_flags |= GPIO_PIN_INPUT;
  308                         WRITE4(sc, GPIO_PCOR(pin->gp_pin),
  309                             (1 << (pin->gp_pin % 32)));
  310                 }
  311         }
  312 
  313         GPIO_UNLOCK(sc);
  314 }
  315 
  316 
  317 static int
  318 vf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
  319 {
  320         struct vf_gpio_softc *sc;
  321         int i;
  322 
  323         sc = device_get_softc(dev);
  324         for (i = 0; i < sc->gpio_npins; i++) {
  325                 if (sc->gpio_pins[i].gp_pin == pin)
  326                         break;
  327         }
  328 
  329         if (i >= sc->gpio_npins)
  330                 return (EINVAL);
  331 
  332         vf_gpio_pin_configure(sc, &sc->gpio_pins[i], flags);
  333 
  334         return (0);
  335 }
  336 
  337 static int
  338 vf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
  339 {
  340         struct vf_gpio_softc *sc;
  341         int i;
  342 
  343         sc = device_get_softc(dev);
  344         for (i = 0; i < sc->gpio_npins; i++) {
  345                 if (sc->gpio_pins[i].gp_pin == pin)
  346                         break;
  347         }
  348 
  349         if (i >= sc->gpio_npins)
  350                 return (EINVAL);
  351 
  352         GPIO_LOCK(sc);
  353         if (value)
  354                 WRITE4(sc, GPIO_PSOR(i), (1 << (i % 32)));
  355         else
  356                 WRITE4(sc, GPIO_PCOR(i), (1 << (i % 32)));
  357         GPIO_UNLOCK(sc);
  358 
  359         return (0);
  360 }
  361 
  362 static device_method_t vf_gpio_methods[] = {
  363         DEVMETHOD(device_probe,         vf_gpio_probe),
  364         DEVMETHOD(device_attach,        vf_gpio_attach),
  365 
  366         /* GPIO protocol */
  367         DEVMETHOD(gpio_get_bus,         vf_gpio_get_bus),
  368         DEVMETHOD(gpio_pin_max,         vf_gpio_pin_max),
  369         DEVMETHOD(gpio_pin_getname,     vf_gpio_pin_getname),
  370         DEVMETHOD(gpio_pin_getcaps,     vf_gpio_pin_getcaps),
  371         DEVMETHOD(gpio_pin_getflags,    vf_gpio_pin_getflags),
  372         DEVMETHOD(gpio_pin_get,         vf_gpio_pin_get),
  373         DEVMETHOD(gpio_pin_toggle,      vf_gpio_pin_toggle),
  374         DEVMETHOD(gpio_pin_setflags,    vf_gpio_pin_setflags),
  375         DEVMETHOD(gpio_pin_set,         vf_gpio_pin_set),
  376         { 0, 0 }
  377 };
  378 
  379 static driver_t vf_gpio_driver = {
  380         "gpio",
  381         vf_gpio_methods,
  382         sizeof(struct vf_gpio_softc),
  383 };
  384 
  385 static devclass_t vf_gpio_devclass;
  386 
  387 DRIVER_MODULE(vf_gpio, simplebus, vf_gpio_driver, vf_gpio_devclass, 0, 0);
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FreeBSD/Linux Kernel Cross Reference sys/arm/freescale/vybrid/vf_gpio.c

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