gpiomdio.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2019 Rubicon Communications, LLC (Netgate)
    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 "opt_platform.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 #include <sys/gpio.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/socket.h>
   40 
   41 #include <net/if.h>
   42 #include <net/if_media.h>
   43 #include <net/if_types.h>
   44 
   45 #include <dev/fdt/fdt_common.h>
   46 #include <dev/gpio/gpiobusvar.h>
   47 #include <dev/mii/mii_bitbang.h>
   48 #include <dev/mii/miivar.h>
   49 #include <dev/ofw/ofw_bus.h>
   50 
   51 #include "gpiobus_if.h"
   52 #include "miibus_if.h"
   53 
   54 #define GPIOMDIO_MDC_DFLT       0
   55 #define GPIOMDIO_MDIO_DFLT      1
   56 #define GPIOMDIO_MIN_PINS       2
   57 
   58 #define MDO_BIT                 0x01
   59 #define MDI_BIT                 0x02
   60 #define MDC_BIT                 0x04
   61 #define MDIRPHY_BIT             0x08
   62 #define MDIRHOST_BIT            0x10
   63 #define MDO                     sc->miibb_ops.mbo_bits[MII_BIT_MDO]
   64 #define MDI                     sc->miibb_ops.mbo_bits[MII_BIT_MDI]
   65 #define MDC                     sc->miibb_ops.mbo_bits[MII_BIT_MDC]
   66 #define MDIRPHY                 sc->miibb_ops.mbo_bits[MII_BIT_DIR_HOST_PHY]
   67 #define MDIRHOST                sc->miibb_ops.mbo_bits[MII_BIT_DIR_PHY_HOST]
   68 
   69 static uint32_t gpiomdio_bb_read(device_t);
   70 static void gpiomdio_bb_write(device_t, uint32_t);
   71 
   72 struct gpiomdio_softc
   73 {
   74         device_t                sc_dev;
   75         device_t                sc_busdev;
   76         int                     mdc_pin;
   77         int                     mdio_pin;
   78         struct mii_bitbang_ops  miibb_ops;
   79 };
   80 
   81 
   82 static int
   83 gpiomdio_probe(device_t dev)
   84 {
   85         struct gpiobus_ivar *devi;
   86 
   87         if (!ofw_bus_status_okay(dev))
   88                 return (ENXIO);
   89         if (!ofw_bus_is_compatible(dev, "freebsd,gpiomdio"))
   90                 return (ENXIO);
   91         devi = GPIOBUS_IVAR(dev);
   92         if (devi->npins < GPIOMDIO_MIN_PINS) {
   93                 device_printf(dev,
   94                     "gpiomdio needs at least %d GPIO pins (only %d given).\n",
   95                     GPIOMDIO_MIN_PINS, devi->npins);
   96                 return (ENXIO);
   97         }
   98         device_set_desc(dev, "GPIO MDIO bit-banging Bus driver");
   99 
  100         return (BUS_PROBE_DEFAULT);
  101 }
  102 
  103 static int
  104 gpiomdio_attach(device_t dev)
  105 {
  106         phandle_t               node;
  107         pcell_t                 pin;
  108         struct gpiobus_ivar     *devi;
  109         struct gpiomdio_softc   *sc;
  110 
  111         sc = device_get_softc(dev);
  112         sc->sc_dev = dev;
  113         sc->sc_busdev = device_get_parent(dev);
  114 
  115         if ((node = ofw_bus_get_node(dev)) == -1)
  116                 return (ENXIO);
  117         if (OF_getencprop(node, "mdc", &pin, sizeof(pin)) > 0)
  118                 sc->mdc_pin = (int)pin;
  119         if (OF_getencprop(node, "mdio", &pin, sizeof(pin)) > 0)
  120                 sc->mdio_pin = (int)pin;
  121 
  122         if (sc->mdc_pin < 0 || sc->mdc_pin > 1)
  123                 sc->mdc_pin = GPIOMDIO_MDC_DFLT;
  124         if (sc->mdio_pin < 0 || sc->mdio_pin > 1)
  125                 sc->mdio_pin = GPIOMDIO_MDIO_DFLT;
  126 
  127         devi = GPIOBUS_IVAR(dev);
  128         device_printf(dev, "MDC pin: %d, MDIO pin: %d\n",
  129             devi->pins[sc->mdc_pin], devi->pins[sc->mdio_pin]);
  130 
  131         /* Initialize mii_bitbang_ops. */
  132         MDO = MDO_BIT;
  133         MDI = MDI_BIT;
  134         MDC = MDC_BIT;
  135         MDIRPHY = MDIRPHY_BIT;
  136         MDIRHOST = MDIRHOST_BIT;
  137         sc->miibb_ops.mbo_read = gpiomdio_bb_read;
  138         sc->miibb_ops.mbo_write = gpiomdio_bb_write;
  139 
  140         /* Register our MDIO Bus device. */
  141         OF_device_register_xref(OF_xref_from_node(node), dev);
  142 
  143         return (0);
  144 }
  145 
  146 static uint32_t
  147 gpiomdio_bb_read(device_t dev)
  148 {
  149         struct gpiomdio_softc *sc;
  150         unsigned int val;
  151 
  152         sc = device_get_softc(dev);
  153         GPIOBUS_PIN_GET(sc->sc_busdev, sc->sc_dev, sc->mdio_pin, &val);
  154 
  155         return (val != 0 ? MDI_BIT : 0);
  156 }
  157 
  158 static void
  159 gpiomdio_bb_write(device_t dev, uint32_t val)
  160 {
  161         struct gpiomdio_softc *sc;
  162 
  163         sc = device_get_softc(dev);
  164 
  165         /* Set the data pin state. */
  166         if ((val & (MDIRPHY_BIT | MDO_BIT)) == (MDIRPHY_BIT | MDO_BIT))
  167                 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdio_pin, 1);
  168         else if ((val & (MDIRPHY_BIT | MDO_BIT)) == MDIRPHY_BIT)
  169                 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdio_pin, 0);
  170         if (val & MDIRPHY_BIT)
  171                 GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->mdio_pin,
  172                     GPIO_PIN_OUTPUT);
  173         else if (val & MDIRHOST_BIT)
  174                 GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->mdio_pin,
  175                     GPIO_PIN_INPUT);
  176 
  177         /* And now the clock state. */
  178         if (val & MDC_BIT)
  179                 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdc_pin, 1);
  180         else
  181                 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdc_pin, 0);
  182         GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->mdc_pin,
  183             GPIO_PIN_OUTPUT);
  184 }
  185 
  186 static int
  187 gpiomdio_readreg(device_t dev, int phy, int reg)
  188 {
  189         struct gpiomdio_softc   *sc;
  190 
  191         sc = device_get_softc(dev);
  192 
  193         return (mii_bitbang_readreg(dev, &sc->miibb_ops, phy, reg));
  194 }
  195 
  196 static int
  197 gpiomdio_writereg(device_t dev, int phy, int reg, int val)
  198 {
  199         struct gpiomdio_softc   *sc;
  200 
  201         sc = device_get_softc(dev);
  202         mii_bitbang_writereg(dev, &sc->miibb_ops, phy, reg, val);
  203 
  204         return (0);
  205 }
  206 
  207 static phandle_t
  208 gpiomdio_get_node(device_t bus, device_t dev)
  209 {
  210 
  211         return (ofw_bus_get_node(bus));
  212 }
  213 
  214 static device_method_t gpiomdio_methods[] = {
  215         /* Device interface */
  216         DEVMETHOD(device_probe,         gpiomdio_probe),
  217         DEVMETHOD(device_attach,        gpiomdio_attach),
  218         DEVMETHOD(device_detach,        bus_generic_detach),
  219 
  220         /* MDIO interface */
  221         DEVMETHOD(miibus_readreg,       gpiomdio_readreg),
  222         DEVMETHOD(miibus_writereg,      gpiomdio_writereg),
  223 
  224         /* OFW bus interface */
  225         DEVMETHOD(ofw_bus_get_node,     gpiomdio_get_node),
  226 
  227         DEVMETHOD_END
  228 };
  229 
  230 static driver_t gpiomdio_driver = {
  231         "gpiomdio",
  232         gpiomdio_methods,
  233         sizeof(struct gpiomdio_softc),
  234 };
  235 
  236 EARLY_DRIVER_MODULE(gpiomdio, gpiobus, gpiomdio_driver, 0, 0,
  237     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
  238 DRIVER_MODULE(miibus, gpiomdio, miibus_driver, 0, 0);
  239 MODULE_DEPEND(gpiomdio, gpiobus, 1, 1, 1);
  240 MODULE_DEPEND(gpiomdio, miibus, 1, 1, 1);
  241 MODULE_DEPEND(gpiomdio, mii_bitbang, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/gpio/gpiomdio.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/gpio/gpiomdio.c