1 /* 2 * Copyright (C) 2016 Maxime Ripard 3 * Maxime Ripard <maxime.ripard@free-electrons.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 */ 10 11 #include <linux/clk-provider.h> 12 13 #include "ccu_gate.h" 14 15 void ccu_gate_helper_disable(struct ccu_common *common, u32 gate) 16 { 17 unsigned long flags; 18 u32 reg; 19 20 if (!gate) 21 return; 22 23 spin_lock_irqsave(common->lock, flags); 24 25 reg = readl(common->base + common->reg); 26 writel(reg & ~gate, common->base + common->reg); 27 28 spin_unlock_irqrestore(common->lock, flags); 29 } 30 31 static void ccu_gate_disable(struct clk_hw *hw) 32 { 33 struct ccu_gate *cg = hw_to_ccu_gate(hw); 34 35 return ccu_gate_helper_disable(&cg->common, cg->enable); 36 } 37 38 int ccu_gate_helper_enable(struct ccu_common *common, u32 gate) 39 { 40 unsigned long flags; 41 u32 reg; 42 43 if (!gate) 44 return 0; 45 46 spin_lock_irqsave(common->lock, flags); 47 48 reg = readl(common->base + common->reg); 49 writel(reg | gate, common->base + common->reg); 50 51 spin_unlock_irqrestore(common->lock, flags); 52 53 return 0; 54 } 55 56 static int ccu_gate_enable(struct clk_hw *hw) 57 { 58 struct ccu_gate *cg = hw_to_ccu_gate(hw); 59 60 return ccu_gate_helper_enable(&cg->common, cg->enable); 61 } 62 63 int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate) 64 { 65 if (!gate) 66 return 1; 67 68 return readl(common->base + common->reg) & gate; 69 } 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 const struct clk_ops ccu_gate_ops = { 79 .disable = ccu_gate_disable, 80 .enable = ccu_gate_enable, 81 .is_enabled = ccu_gate_is_enabled, 82 }; 83