1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (C) 2016 Maxime Ripard
  4 * 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	else
 46		_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	else
128		_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};