Quelle  ccu_div.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016 Maxime Ripard
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 */

#include <linux/clk-provider.h>
#include <linux/io.h>

#include "ccu_gate.h"
#include "ccu_div.h"

static unsigned long ccu_div_round_rate(struct ccu_mux_internal *mux,
     struct clk_hw *parent,
     unsigned long *parent_rate,
     unsigned long rate,
     void *data)
{
 struct ccu_div *cd = data;

 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
  rate *= cd->fixed_post_div;

 rate = divider_round_rate_parent(&cd->common.hw, parent,
      rate, parent_rate,
      cd->div.table, cd->div.width,
      cd->div.flags);

 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
  rate /= cd->fixed_post_div;

 return rate;
}

static void ccu_div_disable(struct clk_hw *hw)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);

 return ccu_gate_helper_disable(&cd->common, cd->enable);
}

static int ccu_div_enable(struct clk_hw *hw)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);

 return ccu_gate_helper_enable(&cd->common, cd->enable);
}

static int ccu_div_is_enabled(struct clk_hw *hw)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);

 return ccu_gate_helper_is_enabled(&cd->common, cd->enable);
}

static unsigned long ccu_div_recalc_rate(struct clk_hw *hw,
     unsigned long parent_rate)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);
 unsigned long val;
 u32 reg;

 reg = readl(cd->common.base + cd->common.reg);
 val = reg >> cd->div.shift;
 val &= (1 << cd->div.width) - 1;

 parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
        parent_rate);

 val = divider_recalc_rate(hw, parent_rate, val, cd->div.table,
      cd->div.flags, cd->div.width);

 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
  val /= cd->fixed_post_div;

 return val;
}

static int ccu_div_determine_rate(struct clk_hw *hw,
    struct clk_rate_request *req)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);

 return ccu_mux_helper_determine_rate(&cd->common, &cd->mux,
          req, ccu_div_round_rate, cd);
}

static int ccu_div_set_rate(struct clk_hw *hw, unsigned long rate,
      unsigned long parent_rate)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);
 unsigned long flags;
 unsigned long val;
 u32 reg;

 parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
        parent_rate);

 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
  rate *= cd->fixed_post_div;

 val = divider_get_val(rate, parent_rate, cd->div.table, cd->div.width,
         cd->div.flags);

 spin_lock_irqsave(cd->common.lock, flags);

 reg = readl(cd->common.base + cd->common.reg);
 reg &= ~GENMASK(cd->div.width + cd->div.shift - 1, cd->div.shift);
 if (cd->common.features & CCU_FEATURE_UPDATE_BIT)
  reg |= CCU_SUNXI_UPDATE_BIT;

 writel(reg | (val << cd->div.shift),
        cd->common.base + cd->common.reg);

 spin_unlock_irqrestore(cd->common.lock, flags);

 return 0;
}

static u8 ccu_div_get_parent(struct clk_hw *hw)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);

 return ccu_mux_helper_get_parent(&cd->common, &cd->mux);
}

static int ccu_div_set_parent(struct clk_hw *hw, u8 index)
{
 struct ccu_div *cd = hw_to_ccu_div(hw);

 return ccu_mux_helper_set_parent(&cd->common, &cd->mux, index);
}

const struct clk_ops ccu_div_ops = {
 .disable = ccu_div_disable,
 .enable  = ccu_div_enable,
 .is_enabled = ccu_div_is_enabled,

 .get_parent = ccu_div_get_parent,
 .set_parent = ccu_div_set_parent,

 .determine_rate = ccu_div_determine_rate,
 .recalc_rate = ccu_div_recalc_rate,
 .set_rate = ccu_div_set_rate,
};
EXPORT_SYMBOL_NS_GPL(ccu_div_ops, "SUNXI_CCU");