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88 lines
2.1 KiB
88 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Socionext Inc. |
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* Author: Masahiro Yamada <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/device.h> |
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#include <linux/regmap.h> |
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#include "clk-uniphier.h" |
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struct uniphier_clk_gate { |
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struct clk_hw hw; |
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struct regmap *regmap; |
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unsigned int reg; |
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unsigned int bit; |
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}; |
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#define to_uniphier_clk_gate(_hw) \ |
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container_of(_hw, struct uniphier_clk_gate, hw) |
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static int uniphier_clk_gate_endisable(struct clk_hw *hw, int enable) |
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{ |
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struct uniphier_clk_gate *gate = to_uniphier_clk_gate(hw); |
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return regmap_write_bits(gate->regmap, gate->reg, BIT(gate->bit), |
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enable ? BIT(gate->bit) : 0); |
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} |
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static int uniphier_clk_gate_enable(struct clk_hw *hw) |
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{ |
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return uniphier_clk_gate_endisable(hw, 1); |
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} |
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static void uniphier_clk_gate_disable(struct clk_hw *hw) |
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{ |
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if (uniphier_clk_gate_endisable(hw, 0) < 0) |
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pr_warn("failed to disable clk\n"); |
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} |
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static int uniphier_clk_gate_is_enabled(struct clk_hw *hw) |
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{ |
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struct uniphier_clk_gate *gate = to_uniphier_clk_gate(hw); |
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unsigned int val; |
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if (regmap_read(gate->regmap, gate->reg, &val) < 0) |
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pr_warn("is_enabled() may return wrong result\n"); |
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return !!(val & BIT(gate->bit)); |
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} |
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static const struct clk_ops uniphier_clk_gate_ops = { |
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.enable = uniphier_clk_gate_enable, |
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.disable = uniphier_clk_gate_disable, |
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.is_enabled = uniphier_clk_gate_is_enabled, |
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}; |
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struct clk_hw *uniphier_clk_register_gate(struct device *dev, |
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struct regmap *regmap, |
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const char *name, |
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const struct uniphier_clk_gate_data *data) |
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{ |
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struct uniphier_clk_gate *gate; |
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struct clk_init_data init; |
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int ret; |
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gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL); |
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if (!gate) |
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return ERR_PTR(-ENOMEM); |
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init.name = name; |
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init.ops = &uniphier_clk_gate_ops; |
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init.flags = data->parent_name ? CLK_SET_RATE_PARENT : 0; |
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init.parent_names = data->parent_name ? &data->parent_name : NULL; |
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init.num_parents = data->parent_name ? 1 : 0; |
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gate->regmap = regmap; |
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gate->reg = data->reg; |
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gate->bit = data->bit; |
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gate->hw.init = &init; |
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ret = devm_clk_hw_register(dev, &gate->hw); |
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if (ret) |
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return ERR_PTR(ret); |
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return &gate->hw; |
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}
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