/*
* drivers/sh/clk.c - SuperH clock framework
*
- * Copyright (C) 2005 - 2009 Paul Mundt
+ * Copyright (C) 2005 - 2010 Paul Mundt
*
* This clock framework is derived from the OMAP version by:
*
* 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/sysdev.h>
#include <linux/seq_file.h>
#include <linux/err.h>
-#include <linux/platform_device.h>
+#include <linux/io.h>
#include <linux/debugfs.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
unsigned long freq;
int i;
+ clk->nr_freqs = nr_freqs;
+
for (i = 0; i < nr_freqs; i++) {
div = 1;
mult = 1;
freq_table[i].frequency = CPUFREQ_TABLE_END;
}
-long clk_rate_table_round(struct clk *clk,
- struct cpufreq_frequency_table *freq_table,
- unsigned long rate)
+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->arg); \
+ 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 rate_best_fit = rate;
- unsigned long highest, lowest;
+ unsigned long rate_best_fit = rounder->rate;
+ unsigned long highest, lowest, freq;
int i;
- highest = lowest = 0;
-
- for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
- unsigned long freq = freq_table[i].frequency;
-
- if (freq == CPUFREQ_ENTRY_INVALID)
- continue;
+ highest = 0;
+ lowest = ~0UL;
+ for_each_frequency(i, rounder, freq) {
if (freq > highest)
highest = freq;
if (freq < lowest)
lowest = freq;
- rate_error = abs(freq - rate);
+ rate_error = abs(freq - rounder->rate);
if (rate_error < rate_error_prev) {
rate_best_fit = freq;
rate_error_prev = rate_error;
break;
}
- if (rate >= highest)
+ if (rounder->rate >= highest)
rate_best_fit = highest;
- if (rate <= lowest)
+ 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,
+ .func = clk_rate_table_iter,
+ .arg = freq_table,
+ .rate = rate,
+ };
+
+ 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);
+}
+
int clk_rate_table_find(struct clk *clk,
struct cpufreq_frequency_table *freq_table,
unsigned long rate)
static void __clk_disable(struct clk *clk)
{
- if (WARN(!clk->usecount, "Trying to disable clock %s with 0 usecount\n",
- clk->name))
+ if (WARN(!clk->usecount, "Trying to disable clock %p with 0 usecount\n",
+ clk))
return;
if (!(--clk->usecount)) {
}
}
+static struct clk_mapping dummy_mapping;
+
+static struct clk *lookup_root_clock(struct clk *clk)
+{
+ while (clk->parent)
+ clk = clk->parent;
+
+ return clk;
+}
+
+static int clk_establish_mapping(struct clk *clk)
+{
+ struct clk_mapping *mapping = clk->mapping;
+
+ /*
+ * Propagate mappings.
+ */
+ if (!mapping) {
+ struct clk *clkp;
+
+ /*
+ * dummy mapping for root clocks with no specified ranges
+ */
+ if (!clk->parent) {
+ clk->mapping = &dummy_mapping;
+ return 0;
+ }
+
+ /*
+ * If we're on a child clock and it provides no mapping of its
+ * own, inherit the mapping from its root clock.
+ */
+ clkp = lookup_root_clock(clk);
+ mapping = clkp->mapping;
+ BUG_ON(!mapping);
+ }
+
+ /*
+ * Establish initial mapping.
+ */
+ if (!mapping->base && mapping->phys) {
+ kref_init(&mapping->ref);
+
+ mapping->base = ioremap_nocache(mapping->phys, mapping->len);
+ if (unlikely(!mapping->base))
+ return -ENXIO;
+ } else if (mapping->base) {
+ /*
+ * Bump the refcount for an existing mapping
+ */
+ kref_get(&mapping->ref);
+ }
+
+ clk->mapping = mapping;
+ return 0;
+}
+
+static void clk_destroy_mapping(struct kref *kref)
+{
+ struct clk_mapping *mapping;
+
+ mapping = container_of(kref, struct clk_mapping, ref);
+
+ iounmap(mapping->base);
+}
+
+static void clk_teardown_mapping(struct clk *clk)
+{
+ struct clk_mapping *mapping = clk->mapping;
+
+ /* Nothing to do */
+ if (mapping == &dummy_mapping)
+ return;
+
+ kref_put(&mapping->ref, clk_destroy_mapping);
+ clk->mapping = NULL;
+}
+
int clk_register(struct clk *clk)
{
+ int ret;
+
if (clk == NULL || IS_ERR(clk))
return -EINVAL;
INIT_LIST_HEAD(&clk->children);
clk->usecount = 0;
+ ret = clk_establish_mapping(clk);
+ if (unlikely(ret))
+ goto out_unlock;
+
if (clk->parent)
list_add(&clk->sibling, &clk->parent->children);
else
list_add(&clk->node, &clock_list);
if (clk->ops && clk->ops->init)
clk->ops->init(clk);
+
+out_unlock:
mutex_unlock(&clock_list_sem);
- return 0;
+ return ret;
}
EXPORT_SYMBOL_GPL(clk_register);
mutex_lock(&clock_list_sem);
list_del(&clk->sibling);
list_del(&clk->node);
+ clk_teardown_mapping(clk);
mutex_unlock(&clock_list_sem);
}
EXPORT_SYMBOL_GPL(clk_unregister);
ret = clk_reparent(clk, parent);
if (ret == 0) {
- pr_debug("clock: set parent of %s to %s (new rate %ld)\n",
- clk->name, clk->parent->name, clk->rate);
if (clk->ops->recalc)
clk->rate = clk->ops->recalc(clk);
+ pr_debug("set parent of %p to %p (new rate %ld)\n",
+ clk, clk->parent, clk->rate);
propagate_rate(clk);
}
} else
char s[255];
char *p = s;
- p += sprintf(p, "%s", c->name);
- if (c->id >= 0)
- sprintf(p, ":%d", c->id);
+ p += sprintf(p, "%p", c);
d = debugfs_create_dir(s, pa ? pa->dentry : clk_debugfs_root);
if (!d)
return -ENOMEM;
return err;
}
- if (!c->dentry && c->name) {
+ if (!c->dentry) {
err = clk_debugfs_register_one(c);
if (err)
return err;
projects / mirror_ubuntu-bionic-kernel.git / blobdiff