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 28 static void ccu_gate_disable(struct clk_hw *hw) 29 { 30 struct ccu_gate *cg = hw_to_ccu_gate(hw); 31 32 return ccu_gate_helper_disable(&cg->common, cg->enable); 33 } 34 35 int ccu_gate_helper_enable(struct ccu_common *common, u32 gate) 36 { 37 unsigned long flags; 38 u32 reg; 39 40 if (!gate) 41 return 0; 42 43 spin_lock_irqsave(common->lock, flags); 44 45 reg = readl(common->base + common->reg); 46 writel(reg | gate, common->base + common->reg); 47 48 spin_unlock_irqrestore(common->lock, flags); 49 50 return 0; 51 } 52 53 static int ccu_gate_enable(struct clk_hw *hw) 54 { 55 struct ccu_gate *cg = hw_to_ccu_gate(hw); 56 57 return ccu_gate_helper_enable(&cg->common, cg->enable); 58 } 59 60 int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate) 61 { 62 if (!gate) 63 return 1; 64 65 return readl(common->base + common->reg) & gate; 66 } 67 68 static int ccu_gate_is_enabled(struct clk_hw *hw) 69 { 70 struct ccu_gate *cg = hw_to_ccu_gate(hw); 71 72 return ccu_gate_helper_is_enabled(&cg->common, cg->enable); 73 } 74 75 static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw, 76 unsigned long parent_rate) 77 { 78 struct ccu_gate *cg = hw_to_ccu_gate(hw); 79 unsigned long rate = parent_rate; 80 81 if (cg->common.features & CCU_FEATURE_ALL_PREDIV) 82 rate /= cg->common.prediv; 83 84 return rate; 85 } 86 87 static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate, 88 unsigned long *prate) 89 { 90 struct ccu_gate *cg = hw_to_ccu_gate(hw); 91 int div = 1; 92 93 if (cg->common.features & CCU_FEATURE_ALL_PREDIV) 94 div = cg->common.prediv; 95 96 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { 97 unsigned long best_parent = rate; 98 99 if (cg->common.features & CCU_FEATURE_ALL_PREDIV) 100 best_parent *= div; 101 *prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent); 102 } 103 104 return *prate / div; 105 } 106 107 static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate, 108 unsigned long parent_rate) 109 { 110 /* 111 * We must report success but we can do so unconditionally because 112 * clk_factor_round_rate returns values that ensure this call is a 113 * nop. 114 */ 115 116 return 0; 117 } 118 119 const struct clk_ops ccu_gate_ops = { 120 .disable = ccu_gate_disable, 121 .enable = ccu_gate_enable, 122 .is_enabled = ccu_gate_is_enabled, 123 .round_rate = ccu_gate_round_rate, 124 .set_rate = ccu_gate_set_rate, 125 .recalc_rate = ccu_gate_recalc_rate, 126 }; 127