usb_nop_xceiv.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 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/rman.h>
   39 #include <sys/lock.h>
   40 #include <sys/mutex.h>
   41 
   42 #include <machine/bus.h>
   43 
   44 #include <dev/ofw/ofw_bus.h>
   45 #include <dev/ofw/ofw_bus_subr.h>
   46 
   47 #include <dev/extres/clk/clk.h>
   48 #include <dev/extres/regulator/regulator.h>
   49 #include <dev/extres/phy/phy_usb.h>
   50 
   51 #include "phynode_if.h"
   52 
   53 struct usb_nop_xceiv_softc {
   54         device_t                dev;
   55         regulator_t             vcc_supply;
   56         clk_t                   clk;
   57         uint32_t                clk_freq;
   58 };
   59 
   60 static struct ofw_compat_data compat_data[] = {
   61         {"usb-nop-xceiv", 1},
   62         {NULL,            0}
   63 };
   64 
   65 /* Phy class and methods. */
   66 static int usb_nop_xceiv_phy_enable(struct phynode *phy, bool enable);
   67 static phynode_usb_method_t usb_nop_xceiv_phynode_methods[] = {
   68         PHYNODEMETHOD(phynode_enable, usb_nop_xceiv_phy_enable),
   69 
   70         PHYNODEMETHOD_END
   71 };
   72 DEFINE_CLASS_1(usb_nop_xceiv_phynode, usb_nop_xceiv_phynode_class,
   73     usb_nop_xceiv_phynode_methods,
   74     sizeof(struct phynode_usb_sc), phynode_usb_class);
   75 
   76 static int
   77 usb_nop_xceiv_phy_enable(struct phynode *phynode, bool enable)
   78 {
   79         struct usb_nop_xceiv_softc *sc;
   80         device_t dev;
   81         intptr_t phy;
   82         int error;
   83 
   84         dev = phynode_get_device(phynode);
   85         phy = phynode_get_id(phynode);
   86         sc = device_get_softc(dev);
   87 
   88         if (phy != 0)
   89                 return (ERANGE);
   90 
   91         /* Enable the phy clock */
   92         if (sc->clk_freq != 0) {
   93                 if (enable) {
   94                         error = clk_set_freq(sc->clk, sc->clk_freq,
   95                           CLK_SET_ROUND_ANY);
   96                         if (error != 0) {
   97                                 device_printf(dev, "Cannot set clock to %dMhz\n",
   98                                   sc->clk_freq);
   99                                 goto fail;
  100                         }
  101 
  102                         error = clk_enable(sc->clk);
  103                 } else
  104                         error = clk_disable(sc->clk);
  105 
  106                 if (error != 0) {
  107                         device_printf(dev, "Cannot %sable the clock\n",
  108                             enable ? "En" : "Dis");
  109                         goto fail;
  110                 }
  111         }
  112         if (sc->vcc_supply) {
  113                 if (enable)
  114                         error = regulator_enable(sc->vcc_supply);
  115                 else
  116                         error = regulator_disable(sc->vcc_supply);
  117                 if (error != 0) {
  118                         device_printf(dev, "Cannot %sable the regulator\n",
  119                             enable ? "En" : "Dis");
  120                         goto fail;
  121                 }
  122         }
  123 
  124         return (0);
  125 
  126 fail:
  127         return (ENXIO);
  128 }
  129 
  130 static int
  131 usb_nop_xceiv_probe(device_t dev)
  132 {
  133 
  134         if (!ofw_bus_status_okay(dev))
  135                 return (ENXIO);
  136 
  137         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  138                 return (ENXIO);
  139 
  140         device_set_desc(dev, "USB NOP PHY");
  141         return (BUS_PROBE_DEFAULT);
  142 }
  143 
  144 static int
  145 usb_nop_xceiv_attach(device_t dev)
  146 {
  147         struct usb_nop_xceiv_softc *sc;
  148         struct phynode *phynode;
  149         struct phynode_init_def phy_init;
  150         phandle_t node;
  151         int error;
  152 
  153         sc = device_get_softc(dev);
  154         sc->dev = dev;
  155         node = ofw_bus_get_node(dev);
  156 
  157         /* Parse the optional properties */
  158         OF_getencprop(node, "clock-frequency", &sc->clk_freq, sizeof(uint32_t));
  159 
  160         error = clk_get_by_ofw_name(dev, node, "main_clk", &sc->clk);
  161         if (error != 0 && sc->clk_freq != 0) {
  162                 device_printf(dev, "clock property is mandatory if clock-frequency is present\n");
  163                 return (ENXIO);
  164         }
  165 
  166         regulator_get_by_ofw_property(dev, node, "vcc-supply", &sc->vcc_supply);
  167 
  168         phy_init.id = 0;
  169         phy_init.ofw_node = node;
  170         phynode = phynode_create(dev, &usb_nop_xceiv_phynode_class,
  171             &phy_init);
  172         if (phynode == NULL) {
  173                 device_printf(dev, "failed to create USB NOP PHY\n");
  174                 return (ENXIO);
  175         }
  176         if (phynode_register(phynode) == NULL) {
  177                 device_printf(dev, "failed to create USB NOP PHY\n");
  178                 return (ENXIO);
  179         }
  180 
  181         OF_device_register_xref(OF_xref_from_node(node), dev);
  182 
  183         return (0);
  184 }
  185 
  186 static int
  187 usb_nop_xceiv_detach(device_t dev)
  188 {
  189 
  190         return (EBUSY);
  191 }
  192 
  193 static device_method_t usb_nop_xceiv_methods[] = {
  194         /* Device interface */
  195         DEVMETHOD(device_probe, usb_nop_xceiv_probe),
  196         DEVMETHOD(device_attach, usb_nop_xceiv_attach),
  197         DEVMETHOD(device_detach, usb_nop_xceiv_detach),
  198 
  199         DEVMETHOD_END
  200 };
  201 
  202 static driver_t usb_nop_xceiv_driver = {
  203         "usb_nop_xceiv",
  204         usb_nop_xceiv_methods,
  205         sizeof(struct usb_nop_xceiv_softc),
  206 };
  207 
  208 EARLY_DRIVER_MODULE(usb_nop_xceiv, simplebus, usb_nop_xceiv_driver,
  209     0, 0, BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);

Cache object: df3fe157d2628a7779efe5c20646ad84

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FreeBSD/Linux Kernel Cross Reference sys/dev/usb/controller/usb_nop_xceiv.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/controller/usb_nop_xceiv.c