clk_gate.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_gate.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_gate_init(struct clknode *clk, device_t dev);
   55 static int clknode_gate_set_gate(struct clknode *clk, bool enable);
   56 static int clknode_gate_get_gate(struct clknode *clk, bool *enable);
   57 struct clknode_gate_sc {
   58         uint32_t        offset;
   59         uint32_t        shift;
   60         uint32_t        mask;
   61         uint32_t        on_value;
   62         uint32_t        off_value;
   63         int             gate_flags;
   64 };
   65 
   66 static clknode_method_t clknode_gate_methods[] = {
   67         /* Device interface */
   68         CLKNODEMETHOD(clknode_init,     clknode_gate_init),
   69         CLKNODEMETHOD(clknode_set_gate, clknode_gate_set_gate),
   70         CLKNODEMETHOD(clknode_get_gate, clknode_gate_get_gate),
   71         CLKNODEMETHOD_END
   72 };
   73 DEFINE_CLASS_1(clknode_gate, clknode_gate_class, clknode_gate_methods,
   74    sizeof(struct clknode_gate_sc), clknode_class);
   75 
   76 static int
   77 clknode_gate_init(struct clknode *clk, device_t dev)
   78 {
   79 
   80         clknode_init_parent_idx(clk, 0);
   81         return(0);
   82 }
   83 
   84 static int
   85 clknode_gate_set_gate(struct clknode *clk, bool enable)
   86 {
   87         uint32_t reg;
   88         struct clknode_gate_sc *sc;
   89         int rv;
   90 
   91         sc = clknode_get_softc(clk);
   92         DEVICE_LOCK(clk);
   93         rv = MD4(clk, sc->offset, sc->mask << sc->shift,
   94             (enable ? sc->on_value : sc->off_value) << sc->shift);
   95         if (rv != 0) {
   96                 DEVICE_UNLOCK(clk);
   97                 return (rv);
   98         }
   99         RD4(clk, sc->offset, &reg);
  100         DEVICE_UNLOCK(clk);
  101         return(0);
  102 }
  103 
  104 static int
  105 clknode_gate_get_gate(struct clknode *clk, bool *enabled)
  106 {
  107         uint32_t reg;
  108         struct clknode_gate_sc *sc;
  109         int rv;
  110 
  111         sc = clknode_get_softc(clk);
  112         DEVICE_LOCK(clk);
  113         rv = RD4(clk, sc->offset, &reg);
  114         DEVICE_UNLOCK(clk);
  115         if (rv != 0)
  116                 return (rv);
  117         reg = (reg >> sc->shift) & sc->mask;
  118         *enabled = reg == sc->on_value;
  119         return(0);
  120 }
  121 
  122 int
  123 clknode_gate_register(struct clkdom *clkdom, struct clk_gate_def *clkdef)
  124 {
  125         struct clknode *clk;
  126         struct clknode_gate_sc *sc;
  127 
  128         clk = clknode_create(clkdom, &clknode_gate_class, &clkdef->clkdef);
  129         if (clk == NULL)
  130                 return (1);
  131 
  132         sc = clknode_get_softc(clk);
  133         sc->offset = clkdef->offset;
  134         sc->shift = clkdef->shift;
  135         sc->mask =  clkdef->mask;
  136         sc->on_value = clkdef->on_value;
  137         sc->off_value = clkdef->off_value;
  138         sc->gate_flags = clkdef->gate_flags;
  139 
  140         clknode_register(clkdom, clk);
  141         return (0);
  142 }

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

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