omap4_gpio.c

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    1 /*-
    2  * Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>.
    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  * 3. The name of the company nor the name of the author may be used to
   15  *    endorse or promote products derived from this software without specific
   16  *    prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/gpio.h>
   38 
   39 #include <machine/bus.h>
   40 #include <machine/intr.h>
   41 
   42 #include <dev/ofw/ofw_bus.h>
   43 #include <dev/ofw/ofw_bus_subr.h>
   44 
   45 #include <arm/ti/ti_cpuid.h>
   46 #include <arm/ti/ti_gpio.h>
   47 #include <arm/ti/ti_pinmux.h>
   48 
   49 #include <arm/ti/omap4/omap4_scm_padconf.h>
   50 
   51 #include "ti_gpio_if.h"
   52 
   53 static struct ofw_compat_data compat_data[] = {
   54         {"ti,omap4-gpio",       1},
   55         {"ti,gpio",             1},
   56         {NULL,                  0},
   57 };
   58 
   59 static int
   60 omap4_gpio_probe(device_t dev)
   61 {
   62 
   63         if (!ofw_bus_status_okay(dev))
   64                 return (ENXIO);
   65 
   66         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
   67                 return (ENXIO);
   68         if (ti_chip() != CHIP_OMAP_4)
   69                 return (ENXIO);
   70 
   71         device_set_desc(dev, "TI OMAP4 General Purpose I/O (GPIO)");
   72 
   73         return (0);
   74 }
   75 
   76 static int
   77 omap4_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
   78 {
   79         unsigned int state = 0;
   80         struct ti_gpio_softc *sc;
   81 
   82         sc = device_get_softc(dev);
   83         /* First the SCM driver needs to be told to put the pad into GPIO mode */
   84         if (flags & GPIO_PIN_OUTPUT)
   85                 state = PADCONF_PIN_OUTPUT;
   86         else if (flags & GPIO_PIN_INPUT) {
   87                 if (flags & GPIO_PIN_PULLUP)
   88                         state = PADCONF_PIN_INPUT_PULLUP;
   89                 else if (flags & GPIO_PIN_PULLDOWN)
   90                         state = PADCONF_PIN_INPUT_PULLDOWN;
   91                 else
   92                         state = PADCONF_PIN_INPUT;
   93         }
   94         return ti_pinmux_padconf_set_gpiomode((sc->sc_bank-1)*32 + gpio, state);
   95 }
   96 
   97 static int
   98 omap4_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
   99 {
  100         unsigned int state;
  101         struct ti_gpio_softc *sc;
  102 
  103         sc = device_get_softc(dev);
  104 
  105         /* Get the current pin state */
  106         if (ti_pinmux_padconf_get_gpiomode((sc->sc_bank-1)*32 + gpio, &state) != 0) {
  107                 *flags = 0;
  108                 return (EINVAL);
  109         } else {
  110                 switch (state) {
  111                         case PADCONF_PIN_OUTPUT:
  112                                 *flags = GPIO_PIN_OUTPUT;
  113                                 break;
  114                         case PADCONF_PIN_INPUT:
  115                                 *flags = GPIO_PIN_INPUT;
  116                                 break;
  117                         case PADCONF_PIN_INPUT_PULLUP:
  118                                 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
  119                                 break;
  120                         case PADCONF_PIN_INPUT_PULLDOWN:
  121                                 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
  122                                 break;
  123                         default:
  124                                 *flags = 0;
  125                                 break;
  126                 }
  127         }
  128 
  129         return (0);
  130 }
  131 
  132 static device_method_t omap4_gpio_methods[] = {
  133         /* bus interface */
  134         DEVMETHOD(device_probe, omap4_gpio_probe),
  135 
  136         /* ti_gpio interface */
  137         DEVMETHOD(ti_gpio_set_flags, omap4_gpio_set_flags),
  138         DEVMETHOD(ti_gpio_get_flags, omap4_gpio_get_flags),
  139 
  140         DEVMETHOD_END
  141 };
  142 
  143 extern driver_t ti_gpio_driver;
  144 
  145 DEFINE_CLASS_1(gpio, omap4_gpio_driver, omap4_gpio_methods,
  146     sizeof(struct ti_gpio_softc), ti_gpio_driver);
  147 DRIVER_MODULE(omap4_gpio, simplebus, omap4_gpio_driver, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/arm/ti/omap4/omap4_gpio.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/omap4/omap4_gpio.c