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135 lines
2.9 KiB
135 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Spreadtrum gate clock driver |
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// |
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// Copyright (C) 2017 Spreadtrum, Inc. |
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// Author: Chunyan Zhang <[email protected]> |
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#include <linux/clk-provider.h> |
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#include <linux/regmap.h> |
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#include "gate.h" |
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static void clk_gate_toggle(const struct sprd_gate *sg, bool en) |
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{ |
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const struct sprd_clk_common *common = &sg->common; |
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unsigned int reg; |
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bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? true : false; |
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set ^= en; |
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regmap_read(common->regmap, common->reg, ®); |
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if (set) |
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reg |= sg->enable_mask; |
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else |
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reg &= ~sg->enable_mask; |
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regmap_write(common->regmap, common->reg, reg); |
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} |
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static void clk_sc_gate_toggle(const struct sprd_gate *sg, bool en) |
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{ |
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const struct sprd_clk_common *common = &sg->common; |
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bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0; |
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unsigned int offset; |
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set ^= en; |
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/* |
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* Each set/clear gate clock has three registers: |
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* common->reg - base register |
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* common->reg + offset - set register |
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* common->reg + 2 * offset - clear register |
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*/ |
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offset = set ? sg->sc_offset : sg->sc_offset * 2; |
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regmap_write(common->regmap, common->reg + offset, |
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sg->enable_mask); |
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} |
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static void sprd_gate_disable(struct clk_hw *hw) |
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{ |
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struct sprd_gate *sg = hw_to_sprd_gate(hw); |
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clk_gate_toggle(sg, false); |
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} |
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static int sprd_gate_enable(struct clk_hw *hw) |
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{ |
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struct sprd_gate *sg = hw_to_sprd_gate(hw); |
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clk_gate_toggle(sg, true); |
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return 0; |
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} |
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static void sprd_sc_gate_disable(struct clk_hw *hw) |
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{ |
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struct sprd_gate *sg = hw_to_sprd_gate(hw); |
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clk_sc_gate_toggle(sg, false); |
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} |
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static int sprd_sc_gate_enable(struct clk_hw *hw) |
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{ |
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struct sprd_gate *sg = hw_to_sprd_gate(hw); |
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clk_sc_gate_toggle(sg, true); |
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return 0; |
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} |
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static int sprd_pll_sc_gate_prepare(struct clk_hw *hw) |
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{ |
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struct sprd_gate *sg = hw_to_sprd_gate(hw); |
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clk_sc_gate_toggle(sg, true); |
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udelay(sg->udelay); |
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return 0; |
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} |
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static int sprd_gate_is_enabled(struct clk_hw *hw) |
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{ |
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struct sprd_gate *sg = hw_to_sprd_gate(hw); |
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struct sprd_clk_common *common = &sg->common; |
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struct clk_hw *parent; |
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unsigned int reg; |
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if (sg->flags & SPRD_GATE_NON_AON) { |
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parent = clk_hw_get_parent(hw); |
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if (!parent || !clk_hw_is_enabled(parent)) |
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return 0; |
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} |
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regmap_read(common->regmap, common->reg, ®); |
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if (sg->flags & CLK_GATE_SET_TO_DISABLE) |
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reg ^= sg->enable_mask; |
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reg &= sg->enable_mask; |
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return reg ? 1 : 0; |
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} |
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const struct clk_ops sprd_gate_ops = { |
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.disable = sprd_gate_disable, |
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.enable = sprd_gate_enable, |
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.is_enabled = sprd_gate_is_enabled, |
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}; |
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EXPORT_SYMBOL_GPL(sprd_gate_ops); |
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const struct clk_ops sprd_sc_gate_ops = { |
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.disable = sprd_sc_gate_disable, |
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.enable = sprd_sc_gate_enable, |
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.is_enabled = sprd_gate_is_enabled, |
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}; |
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EXPORT_SYMBOL_GPL(sprd_sc_gate_ops); |
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const struct clk_ops sprd_pll_sc_gate_ops = { |
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.unprepare = sprd_sc_gate_disable, |
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.prepare = sprd_pll_sc_gate_prepare, |
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.is_enabled = sprd_gate_is_enabled, |
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}; |
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EXPORT_SYMBOL_GPL(sprd_pll_sc_gate_ops);
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