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/*
* SuperH clock framework
*
* Copyright (C) 2005 - 2010 Paul Mundt
*
* This clock framework is derived from the OMAP version by:
*
* Copyright (C) 2004 - 2008 Nokia Corporation
* Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
*
* Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) "clock: " fmt
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/syscore_ops.h>
#include <linux/seq_file.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <linux/sh_clk.h>
static LIST_HEAD(clock_list);
static DEFINE_SPINLOCK(clock_lock);
static DEFINE_MUTEX(clock_list_sem);
/* clock disable operations are not passed on to hardware during boot */
static int allow_disable;
void clk_rate_table_build(struct clk *clk,
struct cpufreq_frequency_table *freq_table,
int nr_freqs,
struct clk_div_mult_table *src_table,
unsigned long *bitmap)
{
unsigned long mult, div;
unsigned long freq;
int i;
clk->nr_freqs = nr_freqs;
for (i = 0; i < nr_freqs; i++) {
div = 1;
mult = 1;
if (src_table->divisors && i < src_table->nr_divisors)
div = src_table->divisors[i];
if (src_table->multipliers && i < src_table->nr_multipliers)
mult = src_table->multipliers[i];
if (!div || !mult || (bitmap && !test_bit(i, bitmap)))
freq = CPUFREQ_ENTRY_INVALID;
else
freq = clk->parent->rate * mult / div;
freq_table[i].driver_data = i;
freq_table[i].frequency = freq;
}
/* Termination entry */
freq_table[i].driver_data = i;
freq_table[i].frequency = CPUFREQ_TABLE_END;
}
struct clk_rate_round_data;
struct clk_rate_round_data {
unsigned long rate;
unsigned int min, max;
long (*func)(unsigned int, struct clk_rate_round_data *);
void *arg;
};
#define for_each_frequency(pos, r, freq) \
for (pos = r->min, freq = r->func(pos, r); \
pos <= r->max; pos++, freq = r->func(pos, r)) \
if (unlikely(freq == 0)) \
; \
else
static long clk_rate_round_helper(struct clk_rate_round_data *rounder)
{
unsigned long rate_error, rate_error_prev = ~0UL;
unsigned long highest, lowest, freq;
long rate_best_fit = -ENOENT;
int i;
highest = 0;
lowest = ~0UL;
for_each_frequency(i, rounder, freq) {
if (freq > highest)
highest = freq;
if (freq < lowest)
lowest = freq;
rate_error = abs(freq - rounder->rate);
if (rate_error < rate_error_prev) {
rate_best_fit = freq;
rate_error_prev = rate_error;
}
if (rate_error == 0)
break;
}
if (rounder->rate >= highest)
rate_best_fit = highest;
if (rounder->rate <= lowest)
rate_best_fit = lowest;
return rate_best_fit;
}
static long clk_rate_table_iter(unsigned int pos,
struct clk_rate_round_data *rounder)
{
struct cpufreq_frequency_table *freq_table = rounder->arg;
unsigned long freq = freq_table[pos].frequency;
if (freq == CPUFREQ_ENTRY_INVALID)
freq = 0;
return freq;
}
long clk_rate_table_round(struct clk *clk,
struct cpufreq_frequency_table *freq_table,
unsigned long rate)
{
struct clk_rate_round_data table_round = {
.min = 0,
.max = clk->nr_freqs - 1,
.func = clk_rate_table_iter,
.arg = freq_table,
.rate = rate,
};
if (clk->nr_freqs < 1)
return -ENOSYS;
return clk_rate_round_helper(&table_round);
}
static long clk_rate_div_range_iter(unsigned int pos,
struct clk_rate_round_data *rounder)
{
return clk_get_rate(rounder->arg) / pos;
}
long clk_rate_div_range_round(struct clk *clk, unsigned int div_min,
unsigned int div_max, unsigned long rate)
{
struct clk_rate_round_data div_range_round = {
.min = div_min,
.max = div_max,
.func = clk_rate_div_range_iter,
.arg = clk_get_parent(clk),
.rate = rate,
};
return clk_rate_round_helper(&div_range_round);
}
static long clk_rate_mult_range_iter(unsigned int pos,
struct clk_rate_round_data *rounder)
{
return clk_get_rate(rounder->arg) * pos;
}
long clk_rate_mult_range_round(struct clk *clk, unsigned int mult_min,
unsigned int mult_max, unsigned long rate)
{
struct clk_rate_round_data mult_range_round = {
.min = mult_min,
.max = mult_max,
.func = clk_rate_mult_range_iter,
.arg = clk_get_parent(clk),
.rate = rate,
};
return clk_rate_round_helper(&mult_range_round);
}
int clk_rate_table_find(struct clk *clk,
struct cpufreq_frequency_table *freq_table,
unsigned long rate)
{
struct cpufreq_frequency_table *pos;
cpufreq_for_each_valid_entry(pos, freq_table)
if (pos->frequency == rate)
return pos - freq_table;
return -ENOENT;
}
/* Used for clocks that always have same value as the parent clock */
unsigned long followparent_recalc(struct clk *clk)
{
return clk->parent ? clk->parent->rate : 0;
}
int clk_reparent(struct clk *child, struct clk *parent)
{
list_del_init(&child->sibling);
if (parent)
list_add(&child->sibling, &parent->children);
child->parent = parent;
return 0;
}
/* Propagate rate to children */
void propagate_rate(struct clk *tclk)
{
struct clk *clkp;
list_for_each_entry(clkp, &tclk->children, sibling) {
if (clkp->ops && clkp->ops->recalc)
clkp->rate<
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