FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/iicoc_fdt.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2019 Axiado Corporation.
      * All rights reserved.
      *
      * This software was developed in part by Philip Paeps under contract for
      * Axiado Corporation.
      *
     * 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/limits.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/rman.h>
    
    #include <dev/extres/clk/clk.h>
    
    #include <dev/iicbus/iicbus.h>
    #include <dev/iicbus/iiconf.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "iicbus_if.h"
    #include "iicoc.h"
    
    static struct ofw_compat_data compat_data[] = {
            { "opencores,i2c-ocores",       1 },
            { "sifive,fu740-c000-i2c",      1 },
            { "sifive,fu540-c000-i2c",      1 },
            { "sifive,i2c0",                1 },
            { NULL,                         0 }
    };
    
    static struct resource_spec iicoc_spec[] = {
            { SYS_RES_MEMORY, 0, RF_ACTIVE },
            RESOURCE_SPEC_END
    };
    
    static phandle_t
    iicoc_get_node(device_t bus, device_t dev)
    {
    
            /* Share controller node with iicbus device. */
            return (ofw_bus_get_node(bus));
    }
    
    static int
    iicoc_attach(device_t dev)
    {
            struct iicoc_softc *sc;
            phandle_t node;
            clk_t clock;
            uint64_t clockfreq;
            int error;
    
            sc = device_get_softc(dev);
            sc->dev = dev;
    
            mtx_init(&sc->sc_mtx, "iicoc", "iicoc", MTX_DEF);
    
            error = bus_alloc_resources(dev, iicoc_spec, &sc->mem_res);
            if (error) {
                    device_printf(dev, "Could not allocate bus resource.\n");
                    goto fail;
            }
    
            node = ofw_bus_get_node(dev);
            sc->reg_shift = 0;
            OF_getencprop(node, "reg-shift", &sc->reg_shift,
               sizeof(sc->reg_shift));
   
           error = clk_get_by_ofw_index(dev, 0, 0, &clock);
           if (error) {
                   device_printf(dev, "Couldn't get clock\n");
                   goto fail;
           }
           error = clk_enable(clock);
           if (error) {
                   device_printf(dev, "Couldn't enable clock\n");
                   goto fail1;
           }
           error = clk_get_freq(clock, &clockfreq);
           if (error) {
                   device_printf(dev, "Couldn't get clock frequency\n");
                   goto fail1;
           }
           if (clockfreq > UINT_MAX) {
                   device_printf(dev, "Unsupported clock frequency\n");
                   goto fail1;
           }
           sc->clockfreq = (u_int)clockfreq;
           sc->i2cfreq = XLP_I2C_FREQ;
           iicoc_init(dev);
   
           sc->iicbus = device_add_child(dev, "iicbus", -1);
           if (sc->iicbus == NULL) {
                   device_printf(dev, "Could not allocate iicbus instance.\n");
                   error = ENXIO;
                   goto fail1;
           }
   
           /* Probe and attach the iicbus when interrupts are available. */
           config_intrhook_oneshot((ich_func_t)bus_generic_attach, dev);
   
           return (0);
   
   fail1:
           clk_disable(clock);
   
   fail:
           bus_release_resources(dev, iicoc_spec, &sc->mem_res);
           mtx_destroy(&sc->sc_mtx);
           return (error);
   }
   
   static int
   iicoc_probe(device_t dev)
   {
   
           if (!ofw_bus_status_okay(dev))
                   return (ENXIO);
   
           if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                   return (ENXIO);
   
           device_set_desc(dev, "OpenCores I2C master controller");
   
           return (BUS_PROBE_DEFAULT);
   }
   
   static device_method_t iicoc_methods[] = {
           /* device interface */
           DEVMETHOD(device_probe, iicoc_probe),
           DEVMETHOD(device_attach, iicoc_attach),
   
           /* ofw interface */
           DEVMETHOD(ofw_bus_get_node, iicoc_get_node),
   
           /* iicbus interface */
           DEVMETHOD(iicbus_callback, iicbus_null_callback),
           DEVMETHOD(iicbus_repeated_start, iicoc_iicbus_repeated_start),
           DEVMETHOD(iicbus_start, iicoc_iicbus_start),
           DEVMETHOD(iicbus_stop, iicoc_iicbus_stop),
           DEVMETHOD(iicbus_reset, iicoc_iicbus_reset),
           DEVMETHOD(iicbus_write, iicoc_iicbus_write),
           DEVMETHOD(iicbus_read, iicoc_iicbus_read),
           DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),
   
           DEVMETHOD_END
   };
   
   static driver_t iicoc_driver = {
           "iicoc",
           iicoc_methods,
           sizeof(struct iicoc_softc),
   };
   
   SIMPLEBUS_PNP_INFO(compat_data);
   DRIVER_MODULE(iicoc, simplebus, iicoc_driver, 0, 0);
   DRIVER_MODULE(ofw_iicbus, iicoc, ofw_iicbus_driver, 0, 0);
   MODULE_DEPEND(iicoc, iicbus, 1, 1, 1);
   MODULE_DEPEND(iicoc, ofw_iicbus, 1, 1, 1);

Cache object: 643ab034cd3e3063576953a27c4fbc6c