forked from Minki/linux
1a7e7c388d
Some clocks in the Allwinner SoCs clocks unit are just simple gates. Add support for those clocks. Since it's a feature that can also be found in more complex clocks, provide a bunch of helpers that can be reused later on. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Michael Turquette <mturquette@baylibre.com> Link: lkml.kernel.org/r/20160629190535.11855-5-maxime.ripard@free-electrons.com
83 lines
1.7 KiB
C
83 lines
1.7 KiB
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate)
|
|
{
|
|
if (!gate)
|
|
return 1;
|
|
|
|
return readl(common->base + common->reg) & gate;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
const struct clk_ops ccu_gate_ops = {
|
|
.disable = ccu_gate_disable,
|
|
.enable = ccu_gate_enable,
|
|
.is_enabled = ccu_gate_is_enabled,
|
|
};
|