mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-19 16:57:47 +07:00
06421a7821
make C=2 reports:
CHECK drivers/clk/sunxi-ng/ccu_nk.c
drivers/clk/sunxi-ng/ccu_nk.c:17:6: warning: symbol 'ccu_nk_find_best' was
not declared. Should it be static?
ccu_nk_find_best is only used within ccu_nk.c. So make it static to get
rid of this warning.
Fixes: adbfb0056e ("clk: sunxi-ng: Add N-K-factor clock support")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
148 lines
3.4 KiB
C
148 lines
3.4 KiB
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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,
|
|
};
|