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126 lines
2.7 KiB
126 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Maxime Ripard |
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* Maxime Ripard <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/io.h> |
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#include "ccu_gate.h" |
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void ccu_gate_helper_disable(struct ccu_common *common, u32 gate) |
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{ |
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unsigned long flags; |
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u32 reg; |
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if (!gate) |
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return; |
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spin_lock_irqsave(common->lock, flags); |
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reg = readl(common->base + common->reg); |
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writel(reg & ~gate, common->base + common->reg); |
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spin_unlock_irqrestore(common->lock, flags); |
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} |
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static void ccu_gate_disable(struct clk_hw *hw) |
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{ |
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struct ccu_gate *cg = hw_to_ccu_gate(hw); |
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return ccu_gate_helper_disable(&cg->common, cg->enable); |
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} |
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int ccu_gate_helper_enable(struct ccu_common *common, u32 gate) |
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{ |
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unsigned long flags; |
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u32 reg; |
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if (!gate) |
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return 0; |
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spin_lock_irqsave(common->lock, flags); |
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reg = readl(common->base + common->reg); |
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writel(reg | gate, common->base + common->reg); |
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spin_unlock_irqrestore(common->lock, flags); |
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return 0; |
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} |
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static int ccu_gate_enable(struct clk_hw *hw) |
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{ |
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struct ccu_gate *cg = hw_to_ccu_gate(hw); |
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return ccu_gate_helper_enable(&cg->common, cg->enable); |
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} |
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int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate) |
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{ |
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if (!gate) |
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return 1; |
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return readl(common->base + common->reg) & gate; |
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} |
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static int ccu_gate_is_enabled(struct clk_hw *hw) |
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{ |
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struct ccu_gate *cg = hw_to_ccu_gate(hw); |
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return ccu_gate_helper_is_enabled(&cg->common, cg->enable); |
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} |
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static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct ccu_gate *cg = hw_to_ccu_gate(hw); |
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unsigned long rate = parent_rate; |
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if (cg->common.features & CCU_FEATURE_ALL_PREDIV) |
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rate /= cg->common.prediv; |
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return rate; |
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} |
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static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long *prate) |
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{ |
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struct ccu_gate *cg = hw_to_ccu_gate(hw); |
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int div = 1; |
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if (cg->common.features & CCU_FEATURE_ALL_PREDIV) |
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div = cg->common.prediv; |
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if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { |
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unsigned long best_parent = rate; |
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if (cg->common.features & CCU_FEATURE_ALL_PREDIV) |
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best_parent *= div; |
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*prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent); |
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} |
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return *prate / div; |
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} |
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static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long parent_rate) |
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{ |
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/* |
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* We must report success but we can do so unconditionally because |
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* clk_factor_round_rate returns values that ensure this call is a |
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* nop. |
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*/ |
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return 0; |
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} |
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const struct clk_ops ccu_gate_ops = { |
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.disable = ccu_gate_disable, |
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.enable = ccu_gate_enable, |
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.is_enabled = ccu_gate_is_enabled, |
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.round_rate = ccu_gate_round_rate, |
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.set_rate = ccu_gate_set_rate, |
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.recalc_rate = ccu_gate_recalc_rate, |
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};
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