forked from Minki/linux
d754b15951
The current function name is a bit confusing, and doesn't really allow to create an explicit function to reverse the operation. We also for now change the parent rate through a pointer, while we don't return anything. In order to be less confusing, and easier to use for downstream users, change the function name to something hopefully clearer, and return the adjusted rate instead of changing the pointer. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
131 lines
3.2 KiB
C
131 lines
3.2 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_div.h"
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static unsigned long ccu_div_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_div *cd = data;
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return divider_round_rate_parent(&cd->common.hw, parent,
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rate, parent_rate,
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cd->div.table, cd->div.width,
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cd->div.flags);
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}
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static void ccu_div_disable(struct clk_hw *hw)
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{
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struct ccu_div *cd = hw_to_ccu_div(hw);
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return ccu_gate_helper_disable(&cd->common, cd->enable);
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}
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static int ccu_div_enable(struct clk_hw *hw)
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{
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struct ccu_div *cd = hw_to_ccu_div(hw);
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return ccu_gate_helper_enable(&cd->common, cd->enable);
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}
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static int ccu_div_is_enabled(struct clk_hw *hw)
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{
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struct ccu_div *cd = hw_to_ccu_div(hw);
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return ccu_gate_helper_is_enabled(&cd->common, cd->enable);
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}
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static unsigned long ccu_div_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct ccu_div *cd = hw_to_ccu_div(hw);
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unsigned long val;
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u32 reg;
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reg = readl(cd->common.base + cd->common.reg);
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val = reg >> cd->div.shift;
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val &= (1 << cd->div.width) - 1;
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parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
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parent_rate);
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return divider_recalc_rate(hw, parent_rate, val, cd->div.table,
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cd->div.flags);
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}
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static int ccu_div_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_div *cd = hw_to_ccu_div(hw);
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return ccu_mux_helper_determine_rate(&cd->common, &cd->mux,
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req, ccu_div_round_rate, cd);
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}
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static int ccu_div_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_div *cd = hw_to_ccu_div(hw);
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unsigned long flags;
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unsigned long val;
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u32 reg;
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parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
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parent_rate);
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val = divider_get_val(rate, parent_rate, cd->div.table, cd->div.width,
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cd->div.flags);
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spin_lock_irqsave(cd->common.lock, flags);
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reg = readl(cd->common.base + cd->common.reg);
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reg &= ~GENMASK(cd->div.width + cd->div.shift - 1, cd->div.shift);
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writel(reg | (val << cd->div.shift),
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cd->common.base + cd->common.reg);
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spin_unlock_irqrestore(cd->common.lock, flags);
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return 0;
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}
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static u8 ccu_div_get_parent(struct clk_hw *hw)
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{
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struct ccu_div *cd = hw_to_ccu_div(hw);
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return ccu_mux_helper_get_parent(&cd->common, &cd->mux);
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}
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static int ccu_div_set_parent(struct clk_hw *hw, u8 index)
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{
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struct ccu_div *cd = hw_to_ccu_div(hw);
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return ccu_mux_helper_set_parent(&cd->common, &cd->mux, index);
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}
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const struct clk_ops ccu_div_ops = {
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.disable = ccu_div_disable,
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.enable = ccu_div_enable,
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.is_enabled = ccu_div_is_enabled,
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.get_parent = ccu_div_get_parent,
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.set_parent = ccu_div_set_parent,
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.determine_rate = ccu_div_determine_rate,
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.recalc_rate = ccu_div_recalc_rate,
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.set_rate = ccu_div_set_rate,
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};
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