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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2016 Maxime Ripard4 * Maxime Ripard <maxime.ripard@free-electrons.com>5 */6 7#include <linux/clk-provider.h>8#include <linux/io.h>9 10#include "ccu_gate.h"11#include "ccu_mult.h"12 13struct _ccu_mult {14 unsigned long mult, min, max;15};16 17static void ccu_mult_find_best(unsigned long parent, unsigned long rate,18 struct _ccu_mult *mult)19{20 int _mult;21 22 _mult = rate / parent;23 if (_mult < mult->min)24 _mult = mult->min;25 26 if (_mult > mult->max)27 _mult = mult->max;28 29 mult->mult = _mult;30}31 32static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,33 struct clk_hw *parent,34 unsigned long *parent_rate,35 unsigned long rate,36 void *data)37{38 struct ccu_mult *cm = data;39 struct _ccu_mult _cm;40 41 _cm.min = cm->mult.min;42 43 if (cm->mult.max)44 _cm.max = cm->mult.max;45 else46 _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;47 48 ccu_mult_find_best(*parent_rate, rate, &_cm);49 50 return *parent_rate * _cm.mult;51}52 53static void ccu_mult_disable(struct clk_hw *hw)54{55 struct ccu_mult *cm = hw_to_ccu_mult(hw);56 57 return ccu_gate_helper_disable(&cm->common, cm->enable);58}59 60static int ccu_mult_enable(struct clk_hw *hw)61{62 struct ccu_mult *cm = hw_to_ccu_mult(hw);63 64 return ccu_gate_helper_enable(&cm->common, cm->enable);65}66 67static int ccu_mult_is_enabled(struct clk_hw *hw)68{69 struct ccu_mult *cm = hw_to_ccu_mult(hw);70 71 return ccu_gate_helper_is_enabled(&cm->common, cm->enable);72}73 74static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw,75 unsigned long parent_rate)76{77 struct ccu_mult *cm = hw_to_ccu_mult(hw);78 unsigned long val;79 u32 reg;80 81 if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac))82 return ccu_frac_helper_read_rate(&cm->common, &cm->frac);83 84 reg = readl(cm->common.base + cm->common.reg);85 val = reg >> cm->mult.shift;86 val &= (1 << cm->mult.width) - 1;87 88 parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,89 parent_rate);90 91 return parent_rate * (val + cm->mult.offset);92}93 94static int ccu_mult_determine_rate(struct clk_hw *hw,95 struct clk_rate_request *req)96{97 struct ccu_mult *cm = hw_to_ccu_mult(hw);98 99 return ccu_mux_helper_determine_rate(&cm->common, &cm->mux,100 req, ccu_mult_round_rate, cm);101}102 103static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,104 unsigned long parent_rate)105{106 struct ccu_mult *cm = hw_to_ccu_mult(hw);107 struct _ccu_mult _cm;108 unsigned long flags;109 u32 reg;110 111 if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) {112 ccu_frac_helper_enable(&cm->common, &cm->frac);113 114 return ccu_frac_helper_set_rate(&cm->common, &cm->frac,115 rate, cm->lock);116 } else {117 ccu_frac_helper_disable(&cm->common, &cm->frac);118 }119 120 parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,121 parent_rate);122 123 _cm.min = cm->mult.min;124 125 if (cm->mult.max)126 _cm.max = cm->mult.max;127 else128 _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;129 130 ccu_mult_find_best(parent_rate, rate, &_cm);131 132 spin_lock_irqsave(cm->common.lock, flags);133 134 reg = readl(cm->common.base + cm->common.reg);135 reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift);136 reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift);137 138 writel(reg, cm->common.base + cm->common.reg);139 140 spin_unlock_irqrestore(cm->common.lock, flags);141 142 ccu_helper_wait_for_lock(&cm->common, cm->lock);143 144 return 0;145}146 147static u8 ccu_mult_get_parent(struct clk_hw *hw)148{149 struct ccu_mult *cm = hw_to_ccu_mult(hw);150 151 return ccu_mux_helper_get_parent(&cm->common, &cm->mux);152}153 154static int ccu_mult_set_parent(struct clk_hw *hw, u8 index)155{156 struct ccu_mult *cm = hw_to_ccu_mult(hw);157 158 return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);159}160 161const struct clk_ops ccu_mult_ops = {162 .disable = ccu_mult_disable,163 .enable = ccu_mult_enable,164 .is_enabled = ccu_mult_is_enabled,165 166 .get_parent = ccu_mult_get_parent,167 .set_parent = ccu_mult_set_parent,168 169 .determine_rate = ccu_mult_determine_rate,170 .recalc_rate = ccu_mult_recalc_rate,171 .set_rate = ccu_mult_set_rate,172};173EXPORT_SYMBOL_NS_GPL(ccu_mult_ops, SUNXI_CCU);174