/* * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright (c) 2016 AmLogic, Inc. * Author: Michael Turquette <mturquette@baylibre.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * The full GNU General Public License is included in this distribution * in the file called COPYING * * BSD LICENSE * * Copyright (c) 2016 AmLogic, Inc. * Author: Michael Turquette <mturquette@baylibre.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * MultiPhase Locked Loops are outputs from a PLL with additional frequency * scaling capabilities. MPLL rates are calculated as: * * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384) */ #include <linux/clk-provider.h> #include "clkc.h" #define SDM_MAX 16384 #define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw) static unsigned long mpll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw); struct parm *p; unsigned long rate = 0; unsigned long reg, sdm, n2; p = &mpll->sdm; reg = readl(mpll->base + p->reg_off); sdm = PARM_GET(p->width, p->shift, reg); p = &mpll->n2; reg = readl(mpll->base + p->reg_off); n2 = PARM_GET(p->width, p->shift, reg); rate = (parent_rate * SDM_MAX) / ((SDM_MAX * n2) + sdm); return rate; } const struct clk_ops meson_clk_mpll_ro_ops = { .recalc_rate = mpll_recalc_rate, };