LXR linux/drivers/clk/sunxi-ng/ccu

   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
  15void 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
  31static 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
  38int 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
  56static 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
  63int 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
  71static 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
  78const 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