1/* $NetBSD: sunxi_ccu_fixed_factor.c,v 1.2 2018/05/08 22:05:25 jmcneill Exp $ */ 2 3/*- 4 * Copyright (c) 2017 Jared 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: sunxi_ccu_fixed_factor.c,v 1.2 2018/05/08 22:05:25 jmcneill Exp $"); 31 32#include <sys/param.h> 33#include <sys/bus.h> 34 35#include <dev/clk/clk_backend.h> 36 37#include <arm/sunxi/sunxi_ccu.h> 38 39static u_int 40sunxi_ccu_fixed_factor_get_parent_rate(struct clk *clkp) 41{ 42 struct clk *clkp_parent; 43 44 clkp_parent = clk_get_parent(clkp); 45 if (clkp_parent == NULL) 46 return 0; 47 48 return clk_get_rate(clkp_parent); 49} 50 51u_int 52sunxi_ccu_fixed_factor_get_rate(struct sunxi_ccu_softc *sc, 53 struct sunxi_ccu_clk *clk) 54{ 55 struct sunxi_ccu_fixed_factor *fixed_factor = &clk->u.fixed_factor; 56 struct clk *clkp = &clk->base; 57 58 KASSERT(clk->type == SUNXI_CCU_FIXED_FACTOR); 59 60 const u_int p_rate = sunxi_ccu_fixed_factor_get_parent_rate(clkp); 61 if (p_rate == 0) 62 return 0; 63 64 return (u_int)(((uint64_t)p_rate * fixed_factor->mult) / fixed_factor->div); 65} 66 67static int 68sunxi_ccu_fixed_factor_set_parent_rate(struct clk *clkp, u_int rate) 69{ 70 struct clk *clkp_parent; 71 72 clkp_parent = clk_get_parent(clkp); 73 if (clkp_parent == NULL) 74 return ENXIO; 75 76 return clk_set_rate(clkp_parent, rate); 77} 78 79int 80sunxi_ccu_fixed_factor_set_rate(struct sunxi_ccu_softc *sc, 81 struct sunxi_ccu_clk *clk, u_int rate) 82{ 83 struct sunxi_ccu_fixed_factor *fixed_factor = &clk->u.fixed_factor; 84 struct clk *clkp = &clk->base; 85 86 KASSERT(clk->type == SUNXI_CCU_FIXED_FACTOR); 87 88 rate *= fixed_factor->div; 89 rate /= fixed_factor->mult; 90 91 return sunxi_ccu_fixed_factor_set_parent_rate(clkp, rate); 92} 93 94const char * 95sunxi_ccu_fixed_factor_get_parent(struct sunxi_ccu_softc *sc, 96 struct sunxi_ccu_clk *clk) 97{ 98 struct sunxi_ccu_fixed_factor *fixed_factor = &clk->u.fixed_factor; 99 100 KASSERT(clk->type == SUNXI_CCU_FIXED_FACTOR); 101 102 return fixed_factor->parent; 103} 104