clk_mux.c

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    1 /*-
    2  * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 
   31 #include <sys/param.h>
   32 #include <sys/conf.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/systm.h>
   36 
   37 #include <machine/bus.h>
   38 
   39 #include <dev/extres/clk/clk_mux.h>
   40 
   41 #include "clkdev_if.h"
   42 
   43 #define WR4(_clk, off, val)                                             \
   44         CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
   45 #define RD4(_clk, off, val)                                             \
   46         CLKDEV_READ_4(clknode_get_device(_clk), off, val)
   47 #define MD4(_clk, off, clr, set )                                       \
   48         CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set)
   49 #define DEVICE_LOCK(_clk)                                                       \
   50         CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
   51 #define DEVICE_UNLOCK(_clk)                                             \
   52         CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
   53 
   54 static int clknode_mux_init(struct clknode *clk, device_t dev);
   55 static int clknode_mux_set_mux(struct clknode *clk, int idx);
   56 
   57 struct clknode_mux_sc {
   58         uint32_t        offset;
   59         uint32_t        shift;
   60         uint32_t        mask;
   61         int             mux_flags;
   62 };
   63 
   64 static clknode_method_t clknode_mux_methods[] = {
   65         /* Device interface */
   66         CLKNODEMETHOD(clknode_init,     clknode_mux_init),
   67         CLKNODEMETHOD(clknode_set_mux,  clknode_mux_set_mux),
   68         CLKNODEMETHOD_END
   69 };
   70 DEFINE_CLASS_1(clknode_mux, clknode_mux_class, clknode_mux_methods,
   71    sizeof(struct clknode_mux_sc), clknode_class);
   72 
   73 
   74 static int
   75 clknode_mux_init(struct clknode *clk, device_t dev)
   76 {
   77         uint32_t reg;
   78         struct clknode_mux_sc *sc;
   79         int rv;
   80 
   81         sc = clknode_get_softc(clk);
   82 
   83         DEVICE_LOCK(clk);
   84         rv = RD4(clk, sc->offset, &reg);
   85         DEVICE_UNLOCK(clk);
   86         if (rv != 0) {
   87                 return (rv);
   88         }
   89         reg = (reg >> sc->shift) & sc->mask;
   90         clknode_init_parent_idx(clk, reg);
   91         return(0);
   92 }
   93 
   94 static int
   95 clknode_mux_set_mux(struct clknode *clk, int idx)
   96 {
   97         uint32_t reg;
   98         struct clknode_mux_sc *sc;
   99         int rv;
  100 
  101         sc = clknode_get_softc(clk);
  102 
  103         DEVICE_LOCK(clk);
  104         rv = MD4(clk, sc->offset, sc->mask << sc->shift,
  105             (idx & sc->mask) << sc->shift);
  106         if (rv != 0) {
  107                 DEVICE_UNLOCK(clk);
  108                 return (rv);
  109         }
  110         RD4(clk, sc->offset, &reg);
  111         DEVICE_UNLOCK(clk);
  112 
  113         return(0);
  114 }
  115 
  116 int
  117 clknode_mux_register(struct clkdom *clkdom, struct clk_mux_def *clkdef)
  118 {
  119         struct clknode *clk;
  120         struct clknode_mux_sc *sc;
  121 
  122         clk = clknode_create(clkdom, &clknode_mux_class, &clkdef->clkdef);
  123         if (clk == NULL)
  124                 return (1);
  125 
  126         sc = clknode_get_softc(clk);
  127         sc->offset = clkdef->offset;
  128         sc->shift = clkdef->shift;
  129         sc->mask =  (1 << clkdef->width) - 1;
  130         sc->mux_flags = clkdef->mux_flags;
  131 
  132         clknode_register(clkdom, clk);
  133         return (0);
  134 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/extres/clk/clk_mux.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/extres/clk/clk_mux.c