FreeBSD/Linux Kernel Cross Reference
sys/arm64/freescale/imx/clk/imx_clk_mux.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
      * All rights reserved.
      *
      * 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/conf.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    
    #include <machine/bus.h>
    
    #include <dev/extres/clk/clk.h>
    
    #include <arm64/freescale/imx/clk/imx_clk_mux.h>
    
    #include "clkdev_if.h"
    
    #define WR4(_clk, off, val)                                             \
            CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
    #define RD4(_clk, off, val)                                             \
            CLKDEV_READ_4(clknode_get_device(_clk), off, val)
    #define MD4(_clk, off, clr, set )                                       \
            CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set)
    #define DEVICE_LOCK(_clk)                                               \
            CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
    #define DEVICE_UNLOCK(_clk)                                             \
            CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
    
    static int imx_clk_mux_init(struct clknode *clk, device_t dev);
    static int imx_clk_mux_set_mux(struct clknode *clk, int idx);
    
    struct imx_clk_mux_sc {
            uint32_t        offset;
            uint32_t        shift;
            uint32_t        mask;
            int             mux_flags;
    };
    
    static clknode_method_t imx_clk_mux_methods[] = {
            /* Device interface */
            CLKNODEMETHOD(clknode_init,     imx_clk_mux_init),
            CLKNODEMETHOD(clknode_set_mux,  imx_clk_mux_set_mux),
            CLKNODEMETHOD_END
    };
    DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods,
       sizeof(struct imx_clk_mux_sc), clknode_class);
    
    static int
    imx_clk_mux_init(struct clknode *clk, device_t dev)
    {
            uint32_t reg;
            struct imx_clk_mux_sc *sc;
            int rv;
    
            sc = clknode_get_softc(clk);
    
            DEVICE_LOCK(clk);
            rv = RD4(clk, sc->offset, &reg);
            DEVICE_UNLOCK(clk);
            if (rv != 0) {
                    return (rv);
            }
            reg = (reg >> sc->shift) & sc->mask;
            clknode_init_parent_idx(clk, reg);
            return(0);
    }
    
    static int
    imx_clk_mux_set_mux(struct clknode *clk, int idx)
    {
            uint32_t reg;
           struct imx_clk_mux_sc *sc;
           int rv;
   
           sc = clknode_get_softc(clk);
   
           DEVICE_LOCK(clk);
           rv = MD4(clk, sc->offset, sc->mask << sc->shift,
               ((idx & sc->mask) << sc->shift));
           if (rv != 0) {
                   DEVICE_UNLOCK(clk);
                   return (rv);
           }
           RD4(clk, sc->offset, &reg);
           DEVICE_UNLOCK(clk);
   
           return(0);
   }
   
   int
   imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef)
   {
           struct clknode *clk;
           struct imx_clk_mux_sc *sc;
   
           clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef);
           if (clk == NULL)
                   return (1);
   
           sc = clknode_get_softc(clk);
           sc->offset = clkdef->offset;
           sc->shift = clkdef->shift;
           sc->mask =  (1 << clkdef->width) - 1;
           sc->mux_flags = clkdef->mux_flags;
   
           clknode_register(clkdom, clk);
           return (0);
   }

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