drivers/clk/sunxi-ng/ccu_gate.c

   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 };