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172 lines
3.9 KiB
172 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Maxime Ripard |
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* Maxime Ripard <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/io.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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