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105 lines
2.6 KiB
105 lines
2.6 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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#define UNIPHIER_CLK_CPUGEAR_STAT 0 /* status */ |
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#define UNIPHIER_CLK_CPUGEAR_SET 4 /* set */ |
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#define UNIPHIER_CLK_CPUGEAR_UPD 8 /* update */ |
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#define UNIPHIER_CLK_CPUGEAR_UPD_BIT BIT(0) |
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struct uniphier_clk_cpugear { |
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struct clk_hw hw; |
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struct regmap *regmap; |
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unsigned int regbase; |
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unsigned int mask; |
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}; |
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#define to_uniphier_clk_cpugear(_hw) \ |
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container_of(_hw, struct uniphier_clk_cpugear, hw) |
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static int uniphier_clk_cpugear_set_parent(struct clk_hw *hw, u8 index) |
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{ |
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struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw); |
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int ret; |
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unsigned int val; |
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ret = regmap_write_bits(gear->regmap, |
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gear->regbase + UNIPHIER_CLK_CPUGEAR_SET, |
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gear->mask, index); |
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if (ret) |
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return ret; |
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ret = regmap_write_bits(gear->regmap, |
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gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD, |
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UNIPHIER_CLK_CPUGEAR_UPD_BIT, |
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UNIPHIER_CLK_CPUGEAR_UPD_BIT); |
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if (ret) |
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return ret; |
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return regmap_read_poll_timeout(gear->regmap, |
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gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD, |
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val, !(val & UNIPHIER_CLK_CPUGEAR_UPD_BIT), |
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0, 1); |
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} |
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static u8 uniphier_clk_cpugear_get_parent(struct clk_hw *hw) |
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{ |
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struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw); |
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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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ret = regmap_read(gear->regmap, |
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gear->regbase + UNIPHIER_CLK_CPUGEAR_STAT, &val); |
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if (ret) |
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return ret; |
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val &= gear->mask; |
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return val < num_parents ? val : -EINVAL; |
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} |
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static const struct clk_ops uniphier_clk_cpugear_ops = { |
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.determine_rate = __clk_mux_determine_rate, |
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.set_parent = uniphier_clk_cpugear_set_parent, |
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.get_parent = uniphier_clk_cpugear_get_parent, |
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}; |
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struct clk_hw *uniphier_clk_register_cpugear(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_cpugear_data *data) |
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{ |
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struct uniphier_clk_cpugear *gear; |
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struct clk_init_data init; |
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int ret; |
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gear = devm_kzalloc(dev, sizeof(*gear), GFP_KERNEL); |
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if (!gear) |
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return ERR_PTR(-ENOMEM); |
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init.name = name; |
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init.ops = &uniphier_clk_cpugear_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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gear->regmap = regmap; |
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gear->regbase = data->regbase; |
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gear->mask = data->mask; |
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gear->hw.init = &init; |
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ret = devm_clk_hw_register(dev, &gear->hw); |
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if (ret) |
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return ERR_PTR(ret); |
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return &gear->hw; |
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}
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