FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/clk/a37x0_xtal.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2021 Semihalf.
      *
      * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/rman.h>
    #include <machine/bus.h>
    
    #include <dev/fdt/simplebus.h>
    
    #include <dev/extres/clk/clk.h>
    #include <dev/extres/clk/clk_fixed.h>
    #include <dev/extres/syscon/syscon.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "syscon_if.h"
    
    #define BIT(x)                  (1 << (x))
    
    #define NB_GPIO1_PIN_LT_L       0x8
    #define NB_GPIO1_MPP1_9         BIT(9)
    
    struct a37x0_xtal_softc {
            device_t                dev;
            struct clkdom           *clkdom;
    };
    
    static int a37x0_xtal_attach(device_t dev);
    static int a37x0_xtal_detach(device_t dev);
    static int a37x0_xtal_probe(device_t dev);
    
    static device_method_t a37x0_xtal_methods [] = {
            DEVMETHOD(device_probe,         a37x0_xtal_probe),
            DEVMETHOD(device_attach,        a37x0_xtal_attach),
            DEVMETHOD(device_detach,        a37x0_xtal_detach),
            DEVMETHOD_END
    };
    
    static driver_t a37x0_xtal_driver = {
            "a37x0-xtal",
            a37x0_xtal_methods,
            sizeof(struct a37x0_xtal_softc)
    };
    
    EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver, 0, 0,
        BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY);
    
    static int
    a37x0_xtal_attach(device_t dev)
    {
            struct a37x0_xtal_softc *sc;
            struct clk_fixed_def def;
            struct syscon *syscon;
            uint32_t reg;
            int error;
    
            sc = device_get_softc(dev);
    
            def.clkdef.name = "armada-3700-xtal";
            def.clkdef.parent_names = NULL;
            def.clkdef.parent_cnt = 0;
            def.clkdef.id = 1;
            def.mult = 0;
            def.div = 0;
    
            if (SYSCON_GET_HANDLE(dev, &syscon) != 0 || syscon == NULL){
                    device_printf(dev, "Cannot get syscon driver handle\n");
                   return (ENXIO);
           }
   
           reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L);
           if (reg & NB_GPIO1_MPP1_9)
                   def.freq = 40000000;
           else
                   def.freq = 25000000;
   
           sc->clkdom = clkdom_create(dev);
           error = clknode_fixed_register(sc->clkdom, &def);
           if (error){
                   device_printf(dev, "Cannot register clock node\n");
                   return (ENXIO);
           }
   
           error = clkdom_finit(sc->clkdom);
           if (error){
                   device_printf(dev, "Cannot finalize clock domain initialization\n");
                   return (ENXIO);
           }
   
           if (bootverbose)
                   clkdom_dump(sc->clkdom);
   
           return (0);
   }
   
   static int
   a37x0_xtal_probe(device_t dev)
   {
   
           if (!ofw_bus_status_okay(dev))
                   return (ENXIO);
   
           if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-xtal-clock"))
                   return (ENXIO);
   
           device_set_desc(dev, "Marvell Armada 3700 Oscillator");
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
   a37x0_xtal_detach(device_t dev)
   {
   
           return (EBUSY);
   }

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