176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/*
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* Copyright (C) 2016 Maxime Ripard
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <linux/clk-provider.h>
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#include "ccu_gate.h"
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#include "ccu_mult.h"
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struct _ccu_mult {
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unsigned long mult, min, max;
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};
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static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
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struct _ccu_mult *mult)
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{
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int _mult;
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_mult = rate / parent;
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if (_mult < mult->min)
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_mult = mult->min;
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if (_mult > mult->max)
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_mult = mult->max;
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mult->mult = _mult;
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}
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static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,
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struct clk_hw *parent,
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unsigned long *parent_rate,
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unsigned long rate,
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void *data)
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{
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struct ccu_mult *cm = data;
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struct _ccu_mult _cm;
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_cm.min = cm->mult.min;
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if (cm->mult.max)
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_cm.max = cm->mult.max;
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else
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_cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;
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ccu_mult_find_best(*parent_rate, rate, &_cm);
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return *parent_rate * _cm.mult;
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}
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static void ccu_mult_disable(struct clk_hw *hw)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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return ccu_gate_helper_disable(&cm->common, cm->enable);
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}
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static int ccu_mult_enable(struct clk_hw *hw)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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return ccu_gate_helper_enable(&cm->common, cm->enable);
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}
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static int ccu_mult_is_enabled(struct clk_hw *hw)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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return ccu_gate_helper_is_enabled(&cm->common, cm->enable);
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}
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static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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unsigned long val;
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u32 reg;
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if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac))
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return ccu_frac_helper_read_rate(&cm->common, &cm->frac);
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reg = readl(cm->common.base + cm->common.reg);
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val = reg >> cm->mult.shift;
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val &= (1 << cm->mult.width) - 1;
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parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
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parent_rate);
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return parent_rate * (val + cm->mult.offset);
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}
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static int ccu_mult_determine_rate(struct clk_hw *hw,
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struct clk_rate_request *req)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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return ccu_mux_helper_determine_rate(&cm->common, &cm->mux,
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req, ccu_mult_round_rate, cm);
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}
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static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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struct _ccu_mult _cm;
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unsigned long flags;
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u32 reg;
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if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) {
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ccu_frac_helper_enable(&cm->common, &cm->frac);
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return ccu_frac_helper_set_rate(&cm->common, &cm->frac,
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rate, cm->lock);
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} else {
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ccu_frac_helper_disable(&cm->common, &cm->frac);
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}
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parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
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parent_rate);
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_cm.min = cm->mult.min;
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if (cm->mult.max)
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_cm.max = cm->mult.max;
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else
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_cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;
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ccu_mult_find_best(parent_rate, rate, &_cm);
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spin_lock_irqsave(cm->common.lock, flags);
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reg = readl(cm->common.base + cm->common.reg);
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reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift);
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reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift);
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writel(reg, cm->common.base + cm->common.reg);
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spin_unlock_irqrestore(cm->common.lock, flags);
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ccu_helper_wait_for_lock(&cm->common, cm->lock);
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return 0;
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}
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static u8 ccu_mult_get_parent(struct clk_hw *hw)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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return ccu_mux_helper_get_parent(&cm->common, &cm->mux);
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}
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static int ccu_mult_set_parent(struct clk_hw *hw, u8 index)
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{
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struct ccu_mult *cm = hw_to_ccu_mult(hw);
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return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);
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}
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const struct clk_ops ccu_mult_ops = {
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.disable = ccu_mult_disable,
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.enable = ccu_mult_enable,
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.is_enabled = ccu_mult_is_enabled,
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.get_parent = ccu_mult_get_parent,
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.set_parent = ccu_mult_set_parent,
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.determine_rate = ccu_mult_determine_rate,
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.recalc_rate = ccu_mult_recalc_rate,
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.set_rate = ccu_mult_set_rate,
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};
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