am335x_gpio.c

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    1 /*-
    2  * Copyright (c) 2012 Damjan Marion <dmarion@FreeBSD.org>
    3  * Copyright (c) 2014 Andrew Turner <andrew@FreeBSD.org>
    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 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 #include <sys/bus.h>
   36 #include <sys/resource.h>
   37 #include <sys/rman.h>
   38 #include <sys/lock.h>
   39 #include <sys/malloc.h>
   40 
   41 #include <machine/bus.h>
   42 #include <machine/resource.h>
   43 #include <machine/intr.h>
   44 #include <sys/gpio.h>
   45 
   46 #include <dev/ofw/ofw_bus.h>
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <arm/ti/ti_cpuid.h>
   50 #include <arm/ti/ti_gpio.h>
   51 #include <arm/ti/ti_pinmux.h>
   52 
   53 #include <arm/ti/am335x/am335x_scm_padconf.h>
   54 
   55 #include "ti_gpio_if.h"
   56 
   57 static struct ofw_compat_data compat_data[] = {
   58         {"ti,am335x-gpio",      1},
   59         /* Linux uses ti,omap4-gpio on am335x so we need to support it */
   60         {"ti,omap4-gpio",       1},
   61         {"ti,gpio",             1},
   62         {NULL,                  0},
   63 };
   64 
   65 static int
   66 am335x_gpio_probe(device_t dev)
   67 {
   68 
   69         if (!ofw_bus_status_okay(dev))
   70                 return (ENXIO);
   71 
   72         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
   73                 return (ENXIO);
   74 
   75         if (ti_chip() != CHIP_AM335X)
   76                 return (ENXIO);
   77 
   78         device_set_desc(dev, "TI AM335x General Purpose I/O (GPIO)");
   79 
   80         return (0);
   81 }
   82 
   83 static int
   84 am335x_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
   85 {
   86         unsigned int state = 0;
   87         struct ti_gpio_softc *sc = device_get_softc(dev);
   88 
   89         if (flags & GPIO_PIN_OUTPUT) {
   90                 if (flags & GPIO_PIN_PULLUP)
   91                         state = PADCONF_OUTPUT_PULLUP;
   92                 else
   93                         state = PADCONF_OUTPUT;
   94         } else if (flags & GPIO_PIN_INPUT) {
   95                 if (flags & GPIO_PIN_PULLUP)
   96                         state = PADCONF_INPUT_PULLUP;
   97                 else if (flags & GPIO_PIN_PULLDOWN)
   98                         state = PADCONF_INPUT_PULLDOWN;
   99                 else
  100                         state = PADCONF_INPUT;
  101         }
  102         return ti_pinmux_padconf_set_gpiomode(sc->sc_bank*32 + gpio, state);
  103 }
  104 
  105 static int
  106 am335x_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
  107 {
  108         unsigned int state;
  109         struct ti_gpio_softc *sc = device_get_softc(dev);
  110 
  111         if (ti_pinmux_padconf_get_gpiomode(sc->sc_bank*32 + gpio, &state) != 0) {
  112                 *flags = 0;
  113                 return (EINVAL);
  114         } else {
  115                 switch (state) {
  116                         case PADCONF_OUTPUT:
  117                                 *flags = GPIO_PIN_OUTPUT;
  118                                 break;
  119                         case PADCONF_OUTPUT_PULLUP:
  120                                 *flags = GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP;
  121                                 break;
  122                         case PADCONF_INPUT:
  123                                 *flags = GPIO_PIN_INPUT;
  124                                 break;
  125                         case PADCONF_INPUT_PULLUP:
  126                                 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
  127                                 break;
  128                         case PADCONF_INPUT_PULLDOWN:
  129                                 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
  130                                 break;
  131                         default:
  132                                 *flags = 0;
  133                                 break;
  134                 }
  135         }
  136 
  137         return (0);
  138 }
  139 
  140 static device_method_t am335x_gpio_methods[] = {
  141         /* bus interface */
  142         DEVMETHOD(device_probe, am335x_gpio_probe),
  143 
  144         /* ti_gpio interface */
  145         DEVMETHOD(ti_gpio_set_flags, am335x_gpio_set_flags),
  146         DEVMETHOD(ti_gpio_get_flags, am335x_gpio_get_flags),
  147 
  148         DEVMETHOD_END
  149 };
  150 
  151 extern driver_t ti_gpio_driver;
  152 
  153 DEFINE_CLASS_1(gpio, am335x_gpio_driver, am335x_gpio_methods,
  154     sizeof(struct ti_gpio_softc), ti_gpio_driver);
  155 DRIVER_MODULE(am335x_gpio, simplebus, am335x_gpio_driver, 0, 0);
  156 MODULE_DEPEND(am335x_gpio, ti_sysc, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/arm/ti/am335x/am335x_gpio.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/am335x/am335x_gpio.c