FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/clk/periph_clk_fixed.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_div.h>
    #include <dev/extres/clk/clk_fixed.h>
    #include <dev/extres/clk/clk_gate.h>
    #include <dev/extres/clk/clk_mux.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "clkdev_if.h"
    #include "periph.h"
    
    #define PARENT_CNT      2
    
    /*
     * Register clock with fixed frequency divider clock. Chain consists of:
     * fixed clock (output from xtal/2) -> mux (choose fixed or xtal frequency)
     */
    
    int
    a37x0_periph_fixed_register_fixed(struct clkdom *clkdom,
        struct a37x0_periph_clknode_def *device_def)
    {
            const char *parent_names[PARENT_CNT];
            struct clk_fixed_def fixed_def;
            struct clk_gate_def *gate;
            struct clk_mux_def *mux;
            int error, dev_id;
    
            dev_id = device_def->common_def.device_id;
            mux = &device_def->clk_def.fixed.mux;
            gate = &device_def->clk_def.fixed.gate;
            fixed_def = device_def->clk_def.fixed.fixed;
    
            fixed_def.clkdef.parent_names = &device_def->common_def.xtal;
            fixed_def.clkdef.parent_cnt = 1;
            fixed_def.clkdef.id = A37x0_INTERNAL_CLK_ID(dev_id, FIXED1_POS);
            fixed_def.clkdef.flags = 0;
            fixed_def.mult = 1;
            fixed_def.div = 2;
            fixed_def.freq = 0;
    
            parent_names[0] = device_def->common_def.xtal;
            parent_names[1] = fixed_def.clkdef.name;
    
            error = clknode_fixed_register(clkdom, &fixed_def);
            if (error)
                    goto fail;
    
            a37x0_periph_set_props(&mux->clkdef, parent_names ,PARENT_CNT);
            error = a37x0_periph_create_mux(clkdom, mux,
                A37x0_INTERNAL_CLK_ID(dev_id, MUX_POS));
            if (error)
                    goto fail;
    
            a37x0_periph_set_props(&gate->clkdef, &mux->clkdef.name, 1);
            error = a37x0_periph_create_gate(clkdom, gate,
                dev_id);
            if (error)
                   goto fail;
   
   fail:
   
           return (error);
   }

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