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clk.c revision 1.1.2.2 
      1 /* $NetBSD: clk.c,v 1.1.2.2 2015/12/27 12:09:49 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: clk.c,v 1.1.2.2 2015/12/27 12:09:49 skrll Exp $");
     31 
     32 #include <sys/param.h>
     33 
     34 #include <dev/clk/clk.h>
     35 #include <dev/clk/clk_backend.h>
     36 
     37 static const char *clk_backend = NULL;
     38 static const struct clk_funcs *clk_funcs = NULL;
     39 static void *clk_priv = NULL;
     40 
     41 int
     42 clk_backend_register(const char *name, const struct clk_funcs *funcs, void *priv)
     43 {
     44 	KASSERT(clk_funcs == NULL);
     45 
     46 	clk_backend = name;
     47 	clk_funcs = funcs;
     48 	clk_priv = priv;
     49 
     50 	return 0;
     51 }
     52 
     53 struct clk *
     54 clk_get(const char *name)
     55 {
     56 	if (clk_funcs == NULL)
     57 		return NULL;
     58 	return clk_funcs->get(clk_priv, name);
     59 }
     60 
     61 void
     62 clk_put(struct clk *clk)
     63 {
     64 	return clk_funcs->put(clk_priv, clk);
     65 }
     66 
     67 u_int
     68 clk_get_rate(struct clk *clk)
     69 {
     70 	return clk_funcs->get_rate(clk_priv, clk);
     71 }
     72 
     73 int
     74 clk_set_rate(struct clk *clk, u_int rate)
     75 {
     76 	if (clk->flags & CLK_SET_RATE_PARENT) {
     77 		return clk_set_rate(clk_get_parent(clk), rate);
     78 	} else {
     79 		return clk_funcs->set_rate(clk_priv, clk, rate);
     80 	}
     81 }
     82 
     83 int
     84 clk_enable(struct clk *clk)
     85 {
     86 	return clk_funcs->enable(clk_priv, clk);
     87 }
     88 
     89 int
     90 clk_disable(struct clk *clk)
     91 {
     92 	return clk_funcs->disable(clk_priv, clk);
     93 }
     94 
     95 int
     96 clk_set_parent(struct clk *clk, struct clk *parent_clk)
     97 {
     98 	return clk_funcs->set_parent(clk_priv, clk, parent_clk);
     99 }
    100 
    101 struct clk *
    102 clk_get_parent(struct clk *clk)
    103 {
    104 	return clk_funcs->get_parent(clk_priv, clk);
    105 }
    106