The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/ixp425/avila_gpio.c

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    1 /*-
    2  * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
    3  * Copyright (c) 2009, Luiz Otavio O Souza.
    4  * Copyright (c) 2010, Andrew Thompson <thompsa@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 /*
   31  * GPIO driver for Gateworks Avilia
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/10.2/sys/arm/xscale/ixp425/avila_gpio.c 278786 2015-02-14 21:16:19Z loos $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/bus.h>
   40 
   41 #include <sys/kernel.h>
   42 #include <sys/module.h>
   43 #include <sys/rman.h>
   44 #include <sys/lock.h>
   45 #include <sys/mutex.h>
   46 #include <sys/gpio.h>
   47 
   48 #include <machine/bus.h>
   49 #include <machine/resource.h>
   50 #include <arm/xscale/ixp425/ixp425reg.h>
   51 #include <arm/xscale/ixp425/ixp425var.h>
   52 
   53 #include "gpio_if.h"
   54 
   55 #define GPIO_SET_BITS(sc, reg, bits)    \
   56         GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, (reg)) | (bits))
   57 
   58 #define GPIO_CLEAR_BITS(sc, reg, bits)  \
   59         GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, (reg)) & ~(bits))
   60 
   61 struct avila_gpio_softc {
   62         device_t                sc_dev;
   63         bus_space_tag_t         sc_iot;
   64         bus_space_handle_t      sc_gpio_ioh;
   65         uint32_t                sc_valid;
   66         struct gpio_pin         sc_pins[IXP4XX_GPIO_PINS];
   67 };
   68 
   69 struct avila_gpio_pin {
   70         const char *name;
   71         int pin;
   72         int caps;
   73 };
   74 
   75 #define GPIO_PIN_IO     (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)
   76 static struct avila_gpio_pin avila_gpio_pins[] = {
   77         { "GPIO0", 0, GPIO_PIN_IO },
   78         { "GPIO1", 1, GPIO_PIN_IO },
   79         { "GPIO2", 2, GPIO_PIN_IO },
   80         { "GPIO3", 3, GPIO_PIN_IO },
   81         { "GPIO4", 4, GPIO_PIN_IO },
   82         /*
   83          * The following pins are connected to system devices and should not
   84          * really be frobbed.
   85          */
   86 #if 0
   87         { "SER_ENA", 5, GPIO_PIN_IO },
   88         { "I2C_SCL", 6, GPIO_PIN_IO },
   89         { "I2C_SDA", 7, GPIO_PIN_IO },
   90         { "PCI_INTD", 8, GPIO_PIN_IO },
   91         { "PCI_INTC", 9, GPIO_PIN_IO },
   92         { "PCI_INTB", 10, GPIO_PIN_IO },
   93         { "PCI_INTA", 11, GPIO_PIN_IO },
   94         { "ATA_INT", 12, GPIO_PIN_IO },
   95         { "PCI_RST", 13, GPIO_PIN_IO },
   96         { "PCI_CLK", 14, GPIO_PIN_OUTPUT },
   97         { "EX_CLK", 15, GPIO_PIN_OUTPUT },
   98 #endif
   99 };
  100 #undef GPIO_PIN_IO
  101 
  102 /*
  103  * Helpers
  104  */
  105 static void avila_gpio_pin_configure(struct avila_gpio_softc *sc,
  106     struct gpio_pin *pin, uint32_t flags);
  107 static int  avila_gpio_pin_flags(struct avila_gpio_softc *sc, uint32_t pin);
  108 
  109 /*
  110  * Driver stuff
  111  */
  112 static int avila_gpio_probe(device_t dev);
  113 static int avila_gpio_attach(device_t dev);
  114 static int avila_gpio_detach(device_t dev);
  115 
  116 /*
  117  * GPIO interface
  118  */
  119 static int avila_gpio_pin_max(device_t dev, int *maxpin);
  120 static int avila_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps);
  121 static int avila_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t
  122     *flags);
  123 static int avila_gpio_pin_getname(device_t dev, uint32_t pin, char *name);
  124 static int avila_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags);
  125 static int avila_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value);
  126 static int avila_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val);
  127 static int avila_gpio_pin_toggle(device_t dev, uint32_t pin);
  128 
  129 static int
  130 avila_gpio_pin_flags(struct avila_gpio_softc *sc, uint32_t pin)
  131 {
  132         uint32_t v;
  133 
  134         v = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR) & (1 << pin);
  135 
  136         return (v ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT);
  137 }
  138 
  139 static void
  140 avila_gpio_pin_configure(struct avila_gpio_softc *sc, struct gpio_pin *pin,
  141     unsigned int flags)
  142 {
  143         uint32_t mask;
  144 
  145         mask = 1 << pin->gp_pin;
  146 
  147         /*
  148          * Manage input/output
  149          */
  150         if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
  151                 IXP4XX_GPIO_LOCK();
  152                 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
  153                 if (flags & GPIO_PIN_OUTPUT) {
  154                         pin->gp_flags |= GPIO_PIN_OUTPUT;
  155                         GPIO_CLEAR_BITS(sc, IXP425_GPIO_GPOER, mask);
  156                 }
  157                 else {
  158                         pin->gp_flags |= GPIO_PIN_INPUT;
  159                         GPIO_SET_BITS(sc, IXP425_GPIO_GPOER, mask);
  160                 }
  161                 IXP4XX_GPIO_UNLOCK();
  162         }
  163 }
  164 
  165 static int
  166 avila_gpio_pin_max(device_t dev, int *maxpin)
  167 {
  168 
  169         *maxpin = IXP4XX_GPIO_PINS - 1;
  170         return (0);
  171 }
  172 
  173 static int
  174 avila_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
  175 {
  176         struct avila_gpio_softc *sc = device_get_softc(dev);
  177 
  178         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
  179                 return (EINVAL);
  180 
  181         *caps = sc->sc_pins[pin].gp_caps;
  182         return (0);
  183 }
  184 
  185 static int
  186 avila_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
  187 {
  188         struct avila_gpio_softc *sc = device_get_softc(dev);
  189 
  190         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
  191                 return (EINVAL);
  192 
  193         IXP4XX_GPIO_LOCK();
  194         /* refresh since we do not own all the pins */
  195         sc->sc_pins[pin].gp_flags = avila_gpio_pin_flags(sc, pin);
  196         *flags = sc->sc_pins[pin].gp_flags;
  197         IXP4XX_GPIO_UNLOCK();
  198 
  199         return (0);
  200 }
  201 
  202 static int
  203 avila_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
  204 {
  205         struct avila_gpio_softc *sc = device_get_softc(dev);
  206 
  207         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
  208                 return (EINVAL);
  209 
  210         memcpy(name, sc->sc_pins[pin].gp_name, GPIOMAXNAME);
  211         return (0);
  212 }
  213 
  214 static int
  215 avila_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
  216 {
  217         struct avila_gpio_softc *sc = device_get_softc(dev);
  218         uint32_t mask = 1 << pin;
  219 
  220         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & mask))
  221                 return (EINVAL);
  222 
  223         avila_gpio_pin_configure(sc, &sc->sc_pins[pin], flags);
  224 
  225         return (0);
  226 }
  227 
  228 static int
  229 avila_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
  230 {
  231         struct avila_gpio_softc *sc = device_get_softc(dev);
  232         uint32_t mask = 1 << pin;
  233 
  234         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & mask))
  235                 return (EINVAL);
  236 
  237         IXP4XX_GPIO_LOCK();
  238         if (value)
  239                 GPIO_SET_BITS(sc, IXP425_GPIO_GPOUTR, mask);
  240         else
  241                 GPIO_CLEAR_BITS(sc, IXP425_GPIO_GPOUTR, mask);
  242         IXP4XX_GPIO_UNLOCK();
  243 
  244         return (0);
  245 }
  246 
  247 static int
  248 avila_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
  249 {
  250         struct avila_gpio_softc *sc = device_get_softc(dev);
  251 
  252         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
  253                 return (EINVAL);
  254 
  255         IXP4XX_GPIO_LOCK();
  256         *val = (GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR) & (1 << pin)) ? 1 : 0;
  257         IXP4XX_GPIO_UNLOCK();
  258 
  259         return (0);
  260 }
  261 
  262 static int
  263 avila_gpio_pin_toggle(device_t dev, uint32_t pin)
  264 {
  265         struct avila_gpio_softc *sc = device_get_softc(dev);
  266         uint32_t mask = 1 << pin;
  267         int res;
  268 
  269         if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & mask))
  270                 return (EINVAL);
  271 
  272         IXP4XX_GPIO_LOCK();
  273         res = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR) & mask;
  274         if (res)
  275                 GPIO_CLEAR_BITS(sc, IXP425_GPIO_GPOUTR, mask);
  276         else
  277                 GPIO_SET_BITS(sc, IXP425_GPIO_GPOUTR, mask);
  278         IXP4XX_GPIO_UNLOCK();
  279 
  280         return (0);
  281 }
  282 
  283 static int
  284 avila_gpio_probe(device_t dev)
  285 {
  286 
  287         device_set_desc(dev, "Gateworks Avila GPIO driver");
  288         return (0);
  289 }
  290 
  291 static int
  292 avila_gpio_attach(device_t dev)
  293 {
  294 #define N(a)    (sizeof(a) / sizeof(a[0]))
  295         struct avila_gpio_softc *sc = device_get_softc(dev);
  296         struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
  297         int i;
  298 
  299         sc->sc_dev = dev;
  300         sc->sc_iot = sa->sc_iot;
  301         sc->sc_gpio_ioh = sa->sc_gpio_ioh;
  302 
  303         for (i = 0; i < N(avila_gpio_pins); i++) {
  304                 struct avila_gpio_pin *p = &avila_gpio_pins[i];
  305 
  306                 strncpy(sc->sc_pins[p->pin].gp_name, p->name, GPIOMAXNAME);
  307                 sc->sc_pins[p->pin].gp_pin = p->pin;
  308                 sc->sc_pins[p->pin].gp_caps = p->caps;
  309                 sc->sc_pins[p->pin].gp_flags = avila_gpio_pin_flags(sc, p->pin);
  310                 sc->sc_valid |= 1 << p->pin;
  311         }
  312 
  313         device_add_child(dev, "gpioc", -1);
  314         device_add_child(dev, "gpiobus", -1);
  315 
  316         return (bus_generic_attach(dev));
  317 #undef N
  318 }
  319 
  320 static int
  321 avila_gpio_detach(device_t dev)
  322 {
  323 
  324         bus_generic_detach(dev);
  325 
  326         return(0);
  327 }
  328 
  329 static device_method_t gpio_avila_methods[] = {
  330         DEVMETHOD(device_probe, avila_gpio_probe),
  331         DEVMETHOD(device_attach, avila_gpio_attach),
  332         DEVMETHOD(device_detach, avila_gpio_detach),
  333 
  334         /* GPIO protocol */
  335         DEVMETHOD(gpio_pin_max, avila_gpio_pin_max),
  336         DEVMETHOD(gpio_pin_getname, avila_gpio_pin_getname),
  337         DEVMETHOD(gpio_pin_getflags, avila_gpio_pin_getflags),
  338         DEVMETHOD(gpio_pin_getcaps, avila_gpio_pin_getcaps),
  339         DEVMETHOD(gpio_pin_setflags, avila_gpio_pin_setflags),
  340         DEVMETHOD(gpio_pin_get, avila_gpio_pin_get),
  341         DEVMETHOD(gpio_pin_set, avila_gpio_pin_set),
  342         DEVMETHOD(gpio_pin_toggle, avila_gpio_pin_toggle),
  343         {0, 0},
  344 };
  345 
  346 static driver_t gpio_avila_driver = {
  347         "gpio_avila",
  348         gpio_avila_methods,
  349         sizeof(struct avila_gpio_softc),
  350 };
  351 static devclass_t gpio_avila_devclass;
  352 extern devclass_t gpiobus_devclass, gpioc_devclass;
  353 extern driver_t gpiobus_driver, gpioc_driver;
  354 
  355 DRIVER_MODULE(gpio_avila, ixp, gpio_avila_driver, gpio_avila_devclass, 0, 0);
  356 DRIVER_MODULE(gpiobus, gpio_avila, gpiobus_driver, gpiobus_devclass, 0, 0);
  357 DRIVER_MODULE(gpioc, gpio_avila, gpioc_driver, gpioc_devclass, 0, 0);
  358 MODULE_VERSION(gpio_avila, 1);

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