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86 lines
2.0 KiB
86 lines
2.0 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_mux { |
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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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const unsigned int *masks; |
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const unsigned int *vals; |
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}; |
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#define to_uniphier_clk_mux(_hw) container_of(_hw, struct uniphier_clk_mux, hw) |
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static int uniphier_clk_mux_set_parent(struct clk_hw *hw, u8 index) |
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{ |
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struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw); |
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return regmap_write_bits(mux->regmap, mux->reg, mux->masks[index], |
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mux->vals[index]); |
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} |
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static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw) |
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{ |
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struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw); |
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unsigned int num_parents = clk_hw_get_num_parents(hw); |
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int ret; |
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unsigned int val; |
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unsigned int i; |
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ret = regmap_read(mux->regmap, mux->reg, &val); |
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if (ret) |
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return ret; |
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for (i = 0; i < num_parents; i++) |
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if ((mux->masks[i] & val) == mux->vals[i]) |
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return i; |
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return -EINVAL; |
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} |
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static const struct clk_ops uniphier_clk_mux_ops = { |
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.determine_rate = __clk_mux_determine_rate, |
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.set_parent = uniphier_clk_mux_set_parent, |
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.get_parent = uniphier_clk_mux_get_parent, |
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}; |
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struct clk_hw *uniphier_clk_register_mux(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_mux_data *data) |
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{ |
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struct uniphier_clk_mux *mux; |
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struct clk_init_data init; |
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int ret; |
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mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL); |
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if (!mux) |
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return ERR_PTR(-ENOMEM); |
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init.name = name; |
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init.ops = &uniphier_clk_mux_ops; |
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init.flags = CLK_SET_RATE_PARENT; |
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init.parent_names = data->parent_names; |
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init.num_parents = data->num_parents; |
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mux->regmap = regmap; |
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mux->reg = data->reg; |
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mux->masks = data->masks; |
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mux->vals = data->vals; |
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mux->hw.init = &init; |
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ret = devm_clk_hw_register(dev, &mux->hw); |
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if (ret) |
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return ERR_PTR(ret); |
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return &mux->hw; |
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}
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