Release 4.16 drivers/clk/sunxi-ng/ccu_gate.c
/*
* Copyright (C) 2016 Maxime Ripard
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <linux/clk-provider.h>
#include "ccu_gate.h"
void ccu_gate_helper_disable(struct ccu_common *common, u32 gate)
{
unsigned long flags;
u32 reg;
if (!gate)
return;
spin_lock_irqsave(common->lock, flags);
reg = readl(common->base + common->reg);
writel(reg & ~gate, common->base + common->reg);
spin_unlock_irqrestore(common->lock, flags);
}
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static void ccu_gate_disable(struct clk_hw *hw)
{
struct ccu_gate *cg = hw_to_ccu_gate(hw);
return ccu_gate_helper_disable(&cg->common, cg->enable);
}
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int ccu_gate_helper_enable(struct ccu_common *common, u32 gate)
{
unsigned long flags;
u32 reg;
if (!gate)
return 0;
spin_lock_irqsave(common->lock, flags);
reg = readl(common->base + common->reg);
writel(reg | gate, common->base + common->reg);
spin_unlock_irqrestore(common->lock, flags);
return 0;
}
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static int ccu_gate_enable(struct clk_hw *hw)
{
struct ccu_gate *cg = hw_to_ccu_gate(hw);
return ccu_gate_helper_enable(&cg->common, cg->enable);
}
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int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate)
{
if (!gate)
return 1;
return readl(common->base + common->reg) & gate;
}
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static int ccu_gate_is_enabled(struct clk_hw *hw)
{
struct ccu_gate *cg = hw_to_ccu_gate(hw);
return ccu_gate_helper_is_enabled(&cg->common, cg->enable);
}
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static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct ccu_gate *cg = hw_to_ccu_gate(hw);
unsigned long rate = parent_rate;
if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
rate /= cg->common.prediv;
return rate;
}
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static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct ccu_gate *cg = hw_to_ccu_gate(hw);
int div = 1;
if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
div = cg->common.prediv;
if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
unsigned long best_parent = rate;
if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
best_parent *= div;
*prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent);
}
return *prate / div;
}
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static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
/*
* We must report success but we can do so unconditionally because
* clk_factor_round_rate returns values that ensure this call is a
* nop.
*/
return 0;
}
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const struct clk_ops ccu_gate_ops = {
.disable = ccu_gate_disable,
.enable = ccu_gate_enable,
.is_enabled = ccu_gate_is_enabled,
.round_rate = ccu_gate_round_rate,
.set_rate = ccu_gate_set_rate,
.recalc_rate = ccu_gate_recalc_rate,
};
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