mpc85xx_gpio.c

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    1 /*-
    2  * Copyright (c) 2015 Justin Hibbits
    3  * Copyright (c) 2013 Thomas Skibo
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/conf.h>
   36 #include <sys/bus.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/lock.h>
   40 #include <sys/mutex.h>
   41 #include <sys/resource.h>
   42 #include <sys/rman.h>
   43 #include <sys/gpio.h>
   44 
   45 #include <machine/bus.h>
   46 #include <machine/resource.h>
   47 #include <machine/stdarg.h>
   48 
   49 #include <dev/fdt/fdt_common.h>
   50 #include <dev/gpio/gpiobusvar.h>
   51 #include <dev/ofw/ofw_bus.h>
   52 #include <dev/ofw/ofw_bus_subr.h>
   53 
   54 #include "gpio_if.h"
   55 
   56 #define MAXPIN          (7)
   57 
   58 #define VALID_PIN(u)    ((u) >= 0 && (u) <= MAXPIN)
   59 
   60 #define GPIO_LOCK(sc)                   mtx_lock(&(sc)->sc_mtx)
   61 #define GPIO_UNLOCK(sc)         mtx_unlock(&(sc)->sc_mtx)
   62 #define GPIO_LOCK_INIT(sc) \
   63         mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \
   64             "gpio", MTX_DEF)
   65 #define GPIO_LOCK_DESTROY(_sc)  mtx_destroy(&_sc->sc_mtx);
   66 
   67 struct mpc85xx_gpio_softc {
   68         device_t        dev;
   69         device_t        busdev;
   70         struct mtx      sc_mtx;
   71         struct resource *out_res;       /* Memory resource */
   72         struct resource *in_res;
   73 };
   74 
   75 static device_t
   76 mpc85xx_gpio_get_bus(device_t dev)
   77 {
   78         struct mpc85xx_gpio_softc *sc;
   79 
   80         sc = device_get_softc(dev);
   81 
   82         return (sc->busdev);
   83 }
   84 
   85 static int
   86 mpc85xx_gpio_pin_max(device_t dev, int *maxpin)
   87 {
   88 
   89         *maxpin = MAXPIN;
   90         return (0);
   91 }
   92 
   93 /* Get a specific pin's capabilities. */
   94 static int
   95 mpc85xx_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
   96 {
   97 
   98         if (!VALID_PIN(pin))
   99                 return (EINVAL);
  100 
  101         *caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
  102 
  103         return (0);
  104 }
  105 
  106 /* Get a specific pin's name. */
  107 static int
  108 mpc85xx_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
  109 {
  110 
  111         if (!VALID_PIN(pin))
  112                 return (EINVAL);
  113 
  114         snprintf(name, GPIOMAXNAME, "GPIO%d", pin);
  115         name[GPIOMAXNAME-1] = '\0';
  116 
  117         return (0);
  118 }
  119 
  120 /* Set a specific output pin's value. */
  121 static int
  122 mpc85xx_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
  123 {
  124         struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
  125         uint32_t outvals;
  126         uint8_t pinbit;
  127 
  128         if (!VALID_PIN(pin) || value > 1)
  129                 return (EINVAL);
  130 
  131         GPIO_LOCK(sc);
  132         pinbit = 31 - pin;
  133 
  134         outvals = bus_read_4(sc->out_res, 0);
  135         outvals &= ~(1 << pinbit);
  136         outvals |= (value << pinbit);
  137         bus_write_4(sc->out_res, 0, outvals);
  138 
  139         GPIO_UNLOCK(sc);
  140 
  141         return (0);
  142 }
  143 
  144 /* Get a specific pin's input value. */
  145 static int
  146 mpc85xx_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
  147 {
  148         struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
  149 
  150         if (!VALID_PIN(pin))
  151                 return (EINVAL);
  152 
  153         *value = (bus_read_4(sc->in_res, 0) >> (31 - pin)) & 1;
  154 
  155         return (0);
  156 }
  157 
  158 /* Toggle a pin's output value. */
  159 static int
  160 mpc85xx_gpio_pin_toggle(device_t dev, uint32_t pin)
  161 {
  162         struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
  163         uint32_t val;
  164 
  165         if (!VALID_PIN(pin))
  166                 return (EINVAL);
  167 
  168         GPIO_LOCK(sc);
  169 
  170         val = bus_read_4(sc->out_res, 0);
  171         val ^= (1 << (31 - pin));
  172         bus_write_4(sc->out_res, 0, val);
  173 
  174         GPIO_UNLOCK(sc);
  175 
  176         return (0);
  177 }
  178 
  179 static int
  180 mpc85xx_gpio_probe(device_t dev)
  181 {
  182         uint32_t svr;
  183 
  184         if (!ofw_bus_status_okay(dev))
  185                 return (ENXIO);
  186 
  187         if (!ofw_bus_is_compatible(dev, "gpio"))
  188                 return (ENXIO);
  189 
  190         svr = mfspr(SPR_SVR);
  191         switch (SVR_VER(svr)) {
  192         case SVR_MPC8533:
  193         case SVR_MPC8533E:
  194                 break;
  195         default:
  196                 return (ENXIO);
  197         }
  198 
  199         device_set_desc(dev, "MPC85xx GPIO driver");
  200         return (0);
  201 }
  202 
  203 static int mpc85xx_gpio_detach(device_t dev);
  204 
  205 static int
  206 mpc85xx_gpio_attach(device_t dev)
  207 {
  208         struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
  209         int rid;
  210 
  211         sc->dev = dev;
  212 
  213         GPIO_LOCK_INIT(sc);
  214 
  215         /* Allocate memory. */
  216         rid = 0;
  217         sc->out_res = bus_alloc_resource_any(dev,
  218                      SYS_RES_MEMORY, &rid, RF_ACTIVE);
  219         if (sc->out_res == NULL) {
  220                 device_printf(dev, "Can't allocate memory for device output port");
  221                 mpc85xx_gpio_detach(dev);
  222                 return (ENOMEM);
  223         }
  224 
  225         rid = 1;
  226         sc->in_res = bus_alloc_resource_any(dev,
  227                      SYS_RES_MEMORY, &rid, RF_ACTIVE);
  228         if (sc->in_res == NULL) {
  229                 device_printf(dev, "Can't allocate memory for device input port");
  230                 mpc85xx_gpio_detach(dev);
  231                 return (ENOMEM);
  232         }
  233 
  234         sc->busdev = gpiobus_attach_bus(dev);
  235         if (sc->busdev == NULL) {
  236                 mpc85xx_gpio_detach(dev);
  237                 return (ENOMEM);
  238         }
  239 
  240         OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
  241 
  242         return (0);
  243 }
  244 
  245 static int
  246 mpc85xx_gpio_detach(device_t dev)
  247 {
  248         struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
  249 
  250         gpiobus_detach_bus(dev);
  251 
  252         if (sc->out_res != NULL) {
  253                 /* Release output port resource. */
  254                 bus_release_resource(dev, SYS_RES_MEMORY,
  255                                      rman_get_rid(sc->out_res), sc->out_res);
  256         }
  257 
  258         if (sc->in_res != NULL) {
  259                 /* Release input port resource. */
  260                 bus_release_resource(dev, SYS_RES_MEMORY,
  261                                      rman_get_rid(sc->in_res), sc->in_res);
  262         }
  263 
  264         GPIO_LOCK_DESTROY(sc);
  265 
  266         return (0);
  267 }
  268 
  269 static device_method_t mpc85xx_gpio_methods[] = {
  270         /* device_if */
  271         DEVMETHOD(device_probe,         mpc85xx_gpio_probe),
  272         DEVMETHOD(device_attach,        mpc85xx_gpio_attach),
  273         DEVMETHOD(device_detach,        mpc85xx_gpio_detach),
  274 
  275         /* GPIO protocol */
  276         DEVMETHOD(gpio_get_bus,         mpc85xx_gpio_get_bus),
  277         DEVMETHOD(gpio_pin_max,         mpc85xx_gpio_pin_max),
  278         DEVMETHOD(gpio_pin_getname,     mpc85xx_gpio_pin_getname),
  279         DEVMETHOD(gpio_pin_getcaps,     mpc85xx_gpio_pin_getcaps),
  280         DEVMETHOD(gpio_pin_get,         mpc85xx_gpio_pin_get),
  281         DEVMETHOD(gpio_pin_set,         mpc85xx_gpio_pin_set),
  282         DEVMETHOD(gpio_pin_toggle,      mpc85xx_gpio_pin_toggle),
  283 
  284         DEVMETHOD_END
  285 };
  286 
  287 static driver_t mpc85xx_gpio_driver = {
  288         "gpio",
  289         mpc85xx_gpio_methods,
  290         sizeof(struct mpc85xx_gpio_softc),
  291 };
  292 
  293 EARLY_DRIVER_MODULE(mpc85xx_gpio, simplebus, mpc85xx_gpio_driver, NULL, NULL,
  294     BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/mpc85xx/mpc85xx_gpio.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/mpc85xx/mpc85xx_gpio.c