1 /* $NetBSD: clk.c,v 1.1 2015/12/05 13:31:07 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@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 2015/12/05 13:31:07 jmcneill 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