1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Maxime Ripard 4 * Maxime Ripard <maxime.ripard@free-electrons.com> 5 */ 6 7 #include <linux/clk-provider.h> 8 #include <linux/io.h> 9 10 #include "ccu_gate.h" 11 12 void ccu_gate_helper_disable(struct ccu_common *common, u32 gate) 13 { 14 unsigned long flags; 15 u32 reg; 16 17 if (!gate) 18 return; 19 20 spin_lock_irqsave(common->lock, flags); 21 22 reg = readl(common->base + common->reg); 23 writel(reg & ~gate, common->base + common->reg); 24 25 spin_unlock_irqrestore(common->lock, flags); 26 } 27 EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_disable, SUNXI_CCU); 28 29 static void ccu_gate_disable(struct clk_hw *hw) 30 { 31 struct ccu_gate *cg = hw_to_ccu_gate(hw); 32 33 return ccu_gate_helper_disable(&cg->common, cg->enable); 34 } 35 36 int ccu_gate_helper_enable(struct ccu_common *common, u32 gate) 37 { 38 unsigned long flags; 39 u32 reg; 40 41 if (!gate) 42 return 0; 43 44 spin_lock_irqsave(common->lock, flags); 45 46 reg = readl(common->base + common->reg); 47 writel(reg | gate, common->base + common->reg); 48 49 spin_unlock_irqrestore(common->lock, flags); 50 51 return 0; 52 } 53 EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_enable, SUNXI_CCU); 54 55 static int ccu_gate_enable(struct clk_hw *hw) 56 { 57 struct ccu_gate *cg = hw_to_ccu_gate(hw); 58 59 return ccu_gate_helper_enable(&cg->common, cg->enable); 60 } 61 62 int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate) 63 { 64 if (!gate) 65 return 1; 66 67 return readl(common->base + common->reg) & gate; 68 } 69 EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_is_enabled, SUNXI_CCU); 70 71 static int ccu_gate_is_enabled(struct clk_hw *hw) 72 { 73 struct ccu_gate *cg = hw_to_ccu_gate(hw); 74 75 return ccu_gate_helper_is_enabled(&cg->common, cg->enable); 76 } 77 78 static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw, 79 unsigned long parent_rate) 80 { 81 struct ccu_gate *cg = hw_to_ccu_gate(hw); 82 unsigned long rate = parent_rate; 83 84 if (cg->common.features & CCU_FEATURE_ALL_PREDIV) 85 rate /= cg->common.prediv; 86 87 return rate; 88 } 89 90 static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate, 91 unsigned long *prate) 92 { 93 struct ccu_gate *cg = hw_to_ccu_gate(hw); 94 int div = 1; 95 96 if (cg->common.features & CCU_FEATURE_ALL_PREDIV) 97 div = cg->common.prediv; 98 99 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { 100 unsigned long best_parent = rate; 101 102 if (cg->common.features & CCU_FEATURE_ALL_PREDIV) 103 best_parent *= div; 104 *prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent); 105 } 106 107 return *prate / div; 108 } 109 110 static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate, 111 unsigned long parent_rate) 112 { 113 /* 114 * We must report success but we can do so unconditionally because 115 * clk_factor_round_rate returns values that ensure this call is a 116 * nop. 117 */ 118 119 return 0; 120 } 121 122 const struct clk_ops ccu_gate_ops = { 123 .disable = ccu_gate_disable, 124 .enable = ccu_gate_enable, 125 .is_enabled = ccu_gate_is_enabled, 126 .round_rate = ccu_gate_round_rate, 127 .set_rate = ccu_gate_set_rate, 128 .recalc_rate = ccu_gate_recalc_rate, 129 }; 130 EXPORT_SYMBOL_NS_GPL(ccu_gate_ops, SUNXI_CCU); 131