forked from Minki/linux
12a26c298d
divider_recalc_rate() is an helper function used by clock divider of
different types, so the structure containing the 'hw' pointer is not
always a 'struct clk_divider'
At the following line:
> div = _get_div(table, val, flags, divider->width);
in several cases, the value of 'divider->width' is garbage as the actual
structure behind this memory is not a 'struct clk_divider'
Fortunately, this width value is used by _get_val() only when
CLK_DIVIDER_MAX_AT_ZERO flag is set. This has never been the case so
far when the structure is not a 'struct clk_divider'. This is probably
why we did not notice this bug before
Fixes: afe76c8fd0 ("clk: allow a clk divider with max divisor when zero")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
147 lines
3.6 KiB
C
147 lines
3.6 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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if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate *= cd->fixed_post_div;
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rate = 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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if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate /= cd->fixed_post_div;
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return rate;
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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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val = divider_recalc_rate(hw, parent_rate, val, cd->div.table,
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cd->div.flags, cd->div.width);
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if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
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val /= cd->fixed_post_div;
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return val;
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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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if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate *= cd->fixed_post_div;
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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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