FreeBSD/Linux Kernel Cross Reference
sys/dev/qcom_dwc3/qcom_dwc3.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.Org>
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Qualcomm DWC3 glue
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/rman.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/gpio.h>
    #include <machine/bus.h>
    
    #include <dev/fdt/simplebus.h>
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    #include <dev/ofw/ofw_subr.h>
    
    #include <dev/extres/clk/clk.h>
    #include <dev/extres/hwreset/hwreset.h>
    #include <dev/extres/phy/phy_usb.h>
    #include <dev/extres/syscon/syscon.h>
    
    static struct ofw_compat_data compat_data[] = {
            { "qcom,dwc3",                  1},
            { NULL,                         0 }
    };
    
    struct qcom_dwc3_softc {
            struct simplebus_softc  sc;
            device_t                dev;
            clk_t                   clk_master;
            clk_t                   clk_sleep;
            clk_t                   clk_mock_utmi;
            int                     type;
    };
    
    static int
    qcom_dwc3_probe(device_t dev)
    {
            phandle_t node;
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                    return (ENXIO);
    
            /* Binding says that we need a child node for the actual dwc3 controller */
            node = ofw_bus_get_node(dev);
            if (OF_child(node) <= 0)
                    return (ENXIO);
    
            device_set_desc(dev, "Qualcomm DWC3");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    qcom_dwc3_attach(device_t dev)
    {
            struct qcom_dwc3_softc *sc;
            device_t cdev;
            phandle_t node, child;
            int err;
    
            sc = device_get_softc(dev);
            sc->dev = dev;
           node = ofw_bus_get_node(dev);
           sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
   
           /* Mandatory clocks */
           if (clk_get_by_ofw_name(dev, 0, "master", &sc->clk_master) != 0) {
                   device_printf(dev, "Cannot get master clock\n");
                   return (ENXIO);
           }
   
           if (clk_get_by_ofw_name(dev, 0, "sleep", &sc->clk_sleep) != 0) {
                   device_printf(dev, "Cannot get sleep clock\n");
                   return (ENXIO);
           }
   
           if (clk_get_by_ofw_name(dev, 0, "mock_utmi", &sc->clk_mock_utmi) != 0) {
                   device_printf(dev, "Cannot get mock_utmi clock\n");
                   return (ENXIO);
           }
   
           /*
            * TODO: when we support optional reset blocks, take things
            * out of reset (well, put them into reset, then take out of reset.)
            */
   
           /*
            * Now, iterate over the clocks and enable them.
            */
           err = clk_enable(sc->clk_master);
           if (err != 0) {
                   device_printf(dev, "Could not enable clock %s\n",
                       clk_get_name(sc->clk_master));
                   return (ENXIO);
           }
           err = clk_enable(sc->clk_sleep);
           if (err != 0) {
                   device_printf(dev, "Could not enable clock %s\n",
                       clk_get_name(sc->clk_sleep));
                   return (ENXIO);
           }
           err = clk_enable(sc->clk_mock_utmi);
           if (err != 0) {
                   device_printf(dev, "Could not enable clock %s\n",
                       clk_get_name(sc->clk_mock_utmi));
                   return (ENXIO);
           }
   
           /*
            * Rest is glue code.
            */
   
           simplebus_init(dev, node);
           if (simplebus_fill_ranges(node, &sc->sc) < 0) {
                   device_printf(dev, "could not get ranges\n");
                   return (ENXIO);
           }
   
           for (child = OF_child(node); child > 0; child = OF_peer(child)) {
                   cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
                   if (cdev != NULL)
                           device_probe_and_attach(cdev);
           }
   
           return (bus_generic_attach(dev));
   }
   
   static device_method_t qcom_dwc3_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         qcom_dwc3_probe),
           DEVMETHOD(device_attach,        qcom_dwc3_attach),
           /* XXX TODO suspend */
           /* XXX TODO resume */
   
           DEVMETHOD_END
   };
   
   DEFINE_CLASS_1(qcom_dwc3, qcom_dwc3_driver, qcom_dwc3_methods,
       sizeof(struct qcom_dwc3_softc), simplebus_driver);
   DRIVER_MODULE(qcom_dwc3, simplebus, qcom_dwc3_driver, 0, 0);

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