1 /* 2 * This file is provided under a dual BSD/GPLv2 license. When using or 3 * redistributing this file, you may do so under either license. 4 * 5 * GPL LICENSE SUMMARY 6 * 7 * Copyright (c) 2016 AmLogic, Inc. 8 * Author: Michael Turquette <mturquette@baylibre.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of version 2 of the GNU General Public License as 12 * published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 22 * The full GNU General Public License is included in this distribution 23 * in the file called COPYING 24 * 25 * BSD LICENSE 26 * 27 * Copyright (c) 2016 AmLogic, Inc. 28 * Author: Michael Turquette <mturquette@baylibre.com> 29 * 30 * Redistribution and use in source and binary forms, with or without 31 * modification, are permitted provided that the following conditions 32 * are met: 33 * 34 * * Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * * Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in 38 * the documentation and/or other materials provided with the 39 * distribution. 40 * * Neither the name of Intel Corporation nor the names of its 41 * contributors may be used to endorse or promote products derived 42 * from this software without specific prior written permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 45 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 46 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 47 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 48 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 49 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 50 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 54 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 55 */ 56 57 /* 58 * MultiPhase Locked Loops are outputs from a PLL with additional frequency 59 * scaling capabilities. MPLL rates are calculated as: 60 * 61 * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384) 62 */ 63 64 #include <linux/clk-provider.h> 65 #include "clkc.h" 66 67 #define SDM_MAX 16384 68 69 #define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw) 70 71 static unsigned long mpll_recalc_rate(struct clk_hw *hw, 72 unsigned long parent_rate) 73 { 74 struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw); 75 struct parm *p; 76 unsigned long rate = 0; 77 unsigned long reg, sdm, n2; 78 79 p = &mpll->sdm; 80 reg = readl(mpll->base + p->reg_off); 81 sdm = PARM_GET(p->width, p->shift, reg); 82 83 p = &mpll->n2; 84 reg = readl(mpll->base + p->reg_off); 85 n2 = PARM_GET(p->width, p->shift, reg); 86 87 rate = (parent_rate * SDM_MAX) / ((SDM_MAX * n2) + sdm); 88 89 return rate; 90 } 91 92 const struct clk_ops meson_clk_mpll_ro_ops = { 93 .recalc_rate = mpll_recalc_rate, 94 }; 95