103c5e1b10
Add support for Actions Semi gate clock together with helper functions to be used in composite clock. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
//
|
|
// OWL gate clock driver
|
|
//
|
|
// Copyright (c) 2014 Actions Semi Inc.
|
|
// Author: David Liu <liuwei@actions-semi.com>
|
|
//
|
|
// Copyright (c) 2018 Linaro Ltd.
|
|
// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "owl-gate.h"
|
|
|
|
void owl_gate_set(const struct owl_clk_common *common,
|
|
const struct owl_gate_hw *gate_hw, bool enable)
|
|
{
|
|
int set = gate_hw->gate_flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
|
|
u32 reg;
|
|
|
|
set ^= enable;
|
|
|
|
regmap_read(common->regmap, gate_hw->reg, ®);
|
|
|
|
if (set)
|
|
reg |= BIT(gate_hw->bit_idx);
|
|
else
|
|
reg &= ~BIT(gate_hw->bit_idx);
|
|
|
|
regmap_write(common->regmap, gate_hw->reg, reg);
|
|
}
|
|
|
|
static void owl_gate_disable(struct clk_hw *hw)
|
|
{
|
|
struct owl_gate *gate = hw_to_owl_gate(hw);
|
|
struct owl_clk_common *common = &gate->common;
|
|
|
|
owl_gate_set(common, &gate->gate_hw, false);
|
|
}
|
|
|
|
static int owl_gate_enable(struct clk_hw *hw)
|
|
{
|
|
struct owl_gate *gate = hw_to_owl_gate(hw);
|
|
struct owl_clk_common *common = &gate->common;
|
|
|
|
owl_gate_set(common, &gate->gate_hw, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int owl_gate_clk_is_enabled(const struct owl_clk_common *common,
|
|
const struct owl_gate_hw *gate_hw)
|
|
{
|
|
u32 reg;
|
|
|
|
regmap_read(common->regmap, gate_hw->reg, ®);
|
|
|
|
if (gate_hw->gate_flags & CLK_GATE_SET_TO_DISABLE)
|
|
reg ^= BIT(gate_hw->bit_idx);
|
|
|
|
return !!(reg & BIT(gate_hw->bit_idx));
|
|
}
|
|
|
|
static int owl_gate_is_enabled(struct clk_hw *hw)
|
|
{
|
|
struct owl_gate *gate = hw_to_owl_gate(hw);
|
|
struct owl_clk_common *common = &gate->common;
|
|
|
|
return owl_gate_clk_is_enabled(common, &gate->gate_hw);
|
|
}
|
|
|
|
const struct clk_ops owl_gate_ops = {
|
|
.disable = owl_gate_disable,
|
|
.enable = owl_gate_enable,
|
|
.is_enabled = owl_gate_is_enabled,
|
|
};
|