imx_nop_usbphy.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 Ian Lepore <ian@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, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 /*
   33  * USBPHY "no-op" driver for Freescale family of SoCs.  This driver is used on
   34  * SoCs which have usbphy hardware whose clocks need to be enabled, but no other
   35  * action has to be taken to make the hardware work.
   36  */
   37 
   38 #include "opt_bus.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/module.h>
   44 #include <sys/bus.h>
   45 #include <sys/rman.h>
   46 
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/ofw_bus_subr.h>
   49 
   50 #include <machine/bus.h>
   51 
   52 #include <arm/freescale/imx/imx_ccmvar.h>
   53 
   54 /*
   55  * Table of supported FDT compat strings.
   56  */
   57 static struct ofw_compat_data compat_data[] = {
   58         {"nop-usbphy",          true},
   59         {"usb-nop-xceiv",       true},
   60         {NULL,                  false},
   61 };
   62 
   63 struct usbphy_softc {
   64         device_t        dev;
   65         u_int           phy_num;
   66 };
   67 
   68 static int
   69 usbphy_detach(device_t dev)
   70 {
   71 
   72         return (0);
   73 }
   74 
   75 static int
   76 usbphy_attach(device_t dev)
   77 {
   78 
   79         /*
   80          * Turn on the phy clocks.
   81          */
   82         imx_ccm_usbphy_enable(dev);
   83 
   84         return (0);
   85 }
   86 
   87 static int
   88 usbphy_probe(device_t dev)
   89 {
   90 
   91         if (!ofw_bus_status_okay(dev))
   92                 return (ENXIO);
   93 
   94         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
   95                 device_set_desc(dev, "Freescale USB PHY");
   96                 return (BUS_PROBE_DEFAULT);
   97         }
   98 
   99         return (ENXIO);
  100 }
  101 
  102 static device_method_t usbphy_methods[] = {
  103         /* Device interface */
  104         DEVMETHOD(device_probe,  usbphy_probe),
  105         DEVMETHOD(device_attach, usbphy_attach),
  106         DEVMETHOD(device_detach, usbphy_detach),
  107 
  108         DEVMETHOD_END
  109 };
  110 
  111 static driver_t usbphy_driver = {
  112         "usbphy",
  113         usbphy_methods,
  114         sizeof(struct usbphy_softc)
  115 };
  116 
  117 DRIVER_MODULE(usbphy, simplebus, usbphy_driver, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/arm/freescale/imx/imx_nop_usbphy.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/imx/imx_nop_usbphy.c