lewisburg_gpio.c

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    1 /*-
    2  * Copyright (c) 2018 Stormshield
    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 #include <sys/param.h>          /* defines used in kernel.h */
   28 #include <sys/module.h>
   29 #include <sys/systm.h>
   30 #include <sys/errno.h>
   31 #include <sys/kernel.h>         /* types used in module initialization */
   32 #include <sys/conf.h>           /* cdevsw struct */
   33 #include <sys/uio.h>            /* uio struct */
   34 #include <sys/malloc.h>
   35 #include <sys/bus.h>            /* structs, prototypes for pci bus stuff and DEVMETHOD macros! */
   36 #include <sys/gpio.h>
   37 
   38 #include <machine/bus.h>
   39 #include <sys/rman.h>
   40 #include <machine/resource.h>
   41 
   42 #include <dev/gpio/gpiobusvar.h>
   43 
   44 #include "gpio_if.h"
   45 
   46 #include "lewisburg_gpiocm.h"
   47 
   48 #define P2SB_GROUP_GPIO_MAX_PINS 24
   49 struct lbggpio_softc
   50 {
   51         device_t                sc_busdev;
   52         int groupid;
   53         int pins_off;
   54         int npins;
   55         char grpname;
   56         struct gpio_pin gpio_setup[P2SB_GROUP_GPIO_MAX_PINS];
   57 };
   58 
   59 static device_t
   60 lbggpio_get_bus(device_t dev)
   61 {
   62         struct lbggpio_softc *sc;
   63 
   64         sc = device_get_softc(dev);
   65 
   66         return (sc->sc_busdev);
   67 }
   68 
   69 static int
   70 lbggpio_pin_max(device_t dev, int *maxpin)
   71 {
   72         struct lbggpio_softc *sc;
   73 
   74         if (maxpin == NULL)
   75                 return (EINVAL);
   76 
   77         sc = device_get_softc(dev);
   78 
   79         *maxpin = sc->npins - 1;
   80 
   81         return (0);
   82 }
   83 
   84 static int
   85 lbggpio_pin_getname(device_t dev, uint32_t pin, char *name)
   86 {
   87         struct lbggpio_softc *sc = device_get_softc(dev);
   88 
   89         if (name == NULL)
   90                 return (EINVAL);
   91 
   92         if (pin >= sc->npins)
   93                 return (EINVAL);
   94 
   95         strlcpy(name, sc->gpio_setup[pin].gp_name, GPIOMAXNAME);
   96 
   97         return (0);
   98 }
   99 
  100 static int
  101 lbggpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
  102 {
  103         struct lbggpio_softc *sc = device_get_softc(dev);
  104 
  105         if (flags == NULL)
  106                 return (EINVAL);
  107 
  108         if (pin >= sc->npins)
  109                 return (EINVAL);
  110 
  111         *flags = sc->gpio_setup[pin].gp_flags;
  112 
  113         return (0);
  114 }
  115 
  116 static int
  117 lbggpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
  118 {
  119         struct lbggpio_softc *sc = device_get_softc(dev);
  120 
  121         if (caps == NULL)
  122                 return (EINVAL);
  123 
  124         if (pin >= sc->npins)
  125                 return (EINVAL);
  126 
  127         *caps = sc->gpio_setup[pin].gp_caps;
  128 
  129         return (0);
  130 }
  131 
  132 static int
  133 lbggpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
  134 {
  135         struct lbggpio_softc *sc = device_get_softc(dev);
  136 
  137         if (pin >= sc->npins)
  138                 return (EINVAL);
  139 
  140         /* Check for unwanted flags. */
  141         if ((flags & sc->gpio_setup[pin].gp_caps) != flags)
  142                 return (EINVAL);
  143 
  144         lbggpiocm_pin_setflags(device_get_parent(dev), dev, pin, flags);
  145         sc->gpio_setup[pin].gp_flags = flags;
  146 
  147         return (0);
  148 }
  149 
  150 static int
  151 lbggpio_pin_get(device_t dev, uint32_t pin, uint32_t *value)
  152 {
  153         struct lbggpio_softc *sc = device_get_softc(dev);
  154 
  155         if (value == NULL)
  156                 return (EINVAL);
  157 
  158         if (pin >= sc->npins)
  159                 return (EINVAL);
  160 
  161         return (lbggpiocm_pin_get(device_get_parent(dev), dev, pin, value));
  162 }
  163 
  164 static int
  165 lbggpio_pin_set(device_t dev, uint32_t pin, uint32_t value)
  166 {
  167         struct lbggpio_softc *sc = device_get_softc(dev);
  168 
  169         if (pin >= sc->npins)
  170                 return (EINVAL);
  171 
  172         return (lbggpiocm_pin_set(device_get_parent(dev), dev, pin, value));
  173 }
  174 
  175 static int
  176 lbggpio_pin_toggle(device_t dev, uint32_t pin)
  177 {
  178         struct lbggpio_softc *sc = device_get_softc(dev);
  179 
  180         if (pin >= sc->npins)
  181                 return (EINVAL);
  182 
  183         return (lbggpiocm_pin_toggle(device_get_parent(dev), dev, pin));
  184 }
  185 
  186 static int
  187 lbggpio_probe(device_t dev)
  188 {
  189         struct lbggpio_softc *sc = device_get_softc(dev);
  190         /* X is a placeholder for the actual one letter group name. */
  191         static char desc[] = "LewisBurg GPIO Group X";
  192 
  193         sc->npins = lbggpiocm_get_group_npins(device_get_parent(dev), dev);
  194         sc->grpname = lbggpiocm_get_group_name(device_get_parent(dev), dev);
  195         if (sc->npins <= 0)
  196                 return (ENXIO);
  197 
  198         desc[sizeof(desc)-2] = sc->grpname;
  199         device_set_desc_copy(dev, desc);
  200         return (BUS_PROBE_DEFAULT);
  201 }
  202 
  203 static int
  204 lbggpio_attach(device_t dev)
  205 {
  206         uint32_t i;
  207         struct lbggpio_softc *sc;
  208 
  209         sc = device_get_softc(dev);
  210         /* GPIO config */
  211         for (i = 0; i < sc->npins; ++i) {
  212                 sc->gpio_setup[i].gp_pin = i;
  213                 snprintf(sc->gpio_setup[i].gp_name,
  214                     sizeof(sc->gpio_setup[i].gp_name),
  215                     "GPIO %c%u", sc->grpname, i);
  216                 sc->gpio_setup[i].gp_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
  217         }
  218 
  219         /* support gpio */
  220         sc->sc_busdev = gpiobus_attach_bus(dev);
  221         if (sc->sc_busdev == NULL)
  222                 return (ENXIO);
  223 
  224         return (0);
  225 }
  226 
  227 static int
  228 lbggpio_detach(device_t dev)
  229 {
  230         struct lbggpio_softc *sc;
  231 
  232         sc = device_get_softc(dev);
  233 
  234         if (sc->sc_busdev)
  235                 gpiobus_detach_bus(dev);
  236 
  237         return (0);
  238 }
  239 
  240 static device_method_t lbggpio_methods[] = {
  241         /* Device interface */
  242         DEVMETHOD(device_probe,         lbggpio_probe),
  243         DEVMETHOD(device_attach,        lbggpio_attach),
  244         DEVMETHOD(device_detach,        lbggpio_detach),
  245 
  246         /* GPIO protocol */
  247         DEVMETHOD(gpio_get_bus,         lbggpio_get_bus),
  248         DEVMETHOD(gpio_pin_max,         lbggpio_pin_max),
  249         DEVMETHOD(gpio_pin_getcaps,     lbggpio_pin_getcaps),
  250         DEVMETHOD(gpio_pin_getflags,    lbggpio_pin_getflags),
  251         DEVMETHOD(gpio_pin_setflags,    lbggpio_pin_setflags),
  252         DEVMETHOD(gpio_pin_getname,     lbggpio_pin_getname),
  253         DEVMETHOD(gpio_pin_set,         lbggpio_pin_set),
  254         DEVMETHOD(gpio_pin_get,         lbggpio_pin_get),
  255         DEVMETHOD(gpio_pin_toggle,      lbggpio_pin_toggle),
  256 
  257         DEVMETHOD_END
  258 };
  259 
  260 static driver_t lbggpio_driver = {
  261         "gpio",
  262         lbggpio_methods,
  263         sizeof(struct lbggpio_softc)
  264 };
  265 
  266 DRIVER_MODULE(lbggpio, lbggpiocm, lbggpio_driver, NULL, NULL);
  267 MODULE_DEPEND(lbggpio, gpiobus, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/p2sb/lewisburg_gpio.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/p2sb/lewisburg_gpio.c