Release 4.8 drivers/clk/sunxi-ng/ccu_nk.c
/*
* Copyright (C) 2016 Maxime Ripard
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <linux/clk-provider.h>
#include <linux/rational.h>
#include "ccu_gate.h"
#include "ccu_nk.h"
static void ccu_nk_find_best(unsigned long parent, unsigned long rate,
unsigned int max_n, unsigned int max_k,
unsigned int *n, unsigned int *k)
{
unsigned long best_rate = 0;
unsigned int best_k = 0, best_n = 0;
unsigned int _k, _n;
for (_k = 1; _k <= max_k; _k++) {
for (_n = 1; _n <= max_n; _n++) {
unsigned long tmp_rate = parent * _n * _k;
if (tmp_rate > rate)
continue;
if ((rate - tmp_rate) < (rate - best_rate)) {
best_rate = tmp_rate;
best_k = _k;
best_n = _n;
}
}
}
*k = best_k;
*n = best_n;
}
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static void ccu_nk_disable(struct clk_hw *hw)
{
struct ccu_nk *nk = hw_to_ccu_nk(hw);
return ccu_gate_helper_disable(&nk->common, nk->enable);
}
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static int ccu_nk_enable(struct clk_hw *hw)
{
struct ccu_nk *nk = hw_to_ccu_nk(hw);
return ccu_gate_helper_enable(&nk->common, nk->enable);
}
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static int ccu_nk_is_enabled(struct clk_hw *hw)
{
struct ccu_nk *nk = hw_to_ccu_nk(hw);
return ccu_gate_helper_is_enabled(&nk->common, nk->enable);
}
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static unsigned long ccu_nk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct ccu_nk *nk = hw_to_ccu_nk(hw);
unsigned long rate, n, k;
u32 reg;
reg = readl(nk->common.base + nk->common.reg);
n = reg >> nk->n.shift;
n &= (1 << nk->n.width) - 1;
k = reg >> nk->k.shift;
k &= (1 << nk->k.width) - 1;
rate = parent_rate * (n + 1) * (k + 1);
if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate /= nk->fixed_post_div;
return rate;
}
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static long ccu_nk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct ccu_nk *nk = hw_to_ccu_nk(hw);
unsigned int n, k;
if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate *= nk->fixed_post_div;
ccu_nk_find_best(*parent_rate, rate,
1 << nk->n.width, 1 << nk->k.width,
&n, &k);
rate = *parent_rate * n * k;
if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate = rate / nk->fixed_post_div;
return rate;
}
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static int ccu_nk_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct ccu_nk *nk = hw_to_ccu_nk(hw);
unsigned long flags;
unsigned int n, k;
u32 reg;
if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate = rate * nk->fixed_post_div;
ccu_nk_find_best(parent_rate, rate,
1 << nk->n.width, 1 << nk->k.width,
&n, &k);
spin_lock_irqsave(nk->common.lock, flags);
reg = readl(nk->common.base + nk->common.reg);
reg &= ~GENMASK(nk->n.width + nk->n.shift - 1, nk->n.shift);
reg &= ~GENMASK(nk->k.width + nk->k.shift - 1, nk->k.shift);
writel(reg | ((k - 1) << nk->k.shift) | ((n - 1) << nk->n.shift),
nk->common.base + nk->common.reg);
spin_unlock_irqrestore(nk->common.lock, flags);
ccu_helper_wait_for_lock(&nk->common, nk->lock);
return 0;
}
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const struct clk_ops ccu_nk_ops = {
.disable = ccu_nk_disable,
.enable = ccu_nk_enable,
.is_enabled = ccu_nk_is_enabled,
.recalc_rate = ccu_nk_recalc_rate,
.round_rate = ccu_nk_round_rate,
.set_rate = ccu_nk_set_rate,
};
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