*/
#include <linux/kernel.h>
#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/list.h>
-#include <linux/kobject.h>
-#include <linux/sysdev.h>
-#include <linux/seq_file.h>
-#include <linux/err.h>
-#include <linux/platform_device.h>
-#include <linux/debugfs.h>
-#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <asm/clock.h>
#include <asm/machvec.h>
-static LIST_HEAD(clock_list);
-static DEFINE_SPINLOCK(clock_lock);
-static DEFINE_MUTEX(clock_list_sem);
-
-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;
-
- 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].index = i;
- freq_table[i].frequency = freq;
- }
-
- /* Termination entry */
- freq_table[i].index = i;
- freq_table[i].frequency = CPUFREQ_TABLE_END;
-}
-
-long clk_rate_table_round(struct clk *clk,
- struct cpufreq_frequency_table *freq_table,
- unsigned long rate)
-{
- unsigned long rate_error, rate_error_prev = ~0UL;
- unsigned long rate_best_fit = rate;
- unsigned long highest, lowest;
- 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;
-
- if (freq > highest)
- highest = freq;
- if (freq < lowest)
- lowest = freq;
-
- rate_error = abs(freq - rate);
- if (rate_error < rate_error_prev) {
- rate_best_fit = freq;
- rate_error_prev = rate_error;
- }
-
- if (rate_error == 0)
- break;
- }
-
- if (rate >= highest)
- rate_best_fit = highest;
- if (rate <= lowest)
- rate_best_fit = lowest;
-
- return rate_best_fit;
-}
-
-int clk_rate_table_find(struct clk *clk,
- struct cpufreq_frequency_table *freq_table,
- unsigned long rate)
-{
- int i;
-
- for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
- unsigned long freq = freq_table[i].frequency;
-
- if (freq == CPUFREQ_ENTRY_INVALID)
- continue;
-
- if (freq == rate)
- return i;
- }
-
- 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;
-
- /* now do the debugfs renaming to reattach the child
- to the proper 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 = clkp->ops->recalc(clkp);
-
- propagate_rate(clkp);
- }
-}
-
-static void __clk_disable(struct clk *clk)
-{
- if (clk->usecount == 0) {
- printk(KERN_ERR "Trying disable clock %s with 0 usecount\n",
- clk->name);
- WARN_ON(1);
- return;
- }
-
- if (!(--clk->usecount)) {
- if (likely(clk->ops && clk->ops->disable))
- clk->ops->disable(clk);
- if (likely(clk->parent))
- __clk_disable(clk->parent);
- }
-}
-
-void clk_disable(struct clk *clk)
-{
- unsigned long flags;
-
- if (!clk)
- return;
-
- spin_lock_irqsave(&clock_lock, flags);
- __clk_disable(clk);
- spin_unlock_irqrestore(&clock_lock, flags);
-}
-EXPORT_SYMBOL_GPL(clk_disable);
-
-static int __clk_enable(struct clk *clk)
-{
- int ret = 0;
-
- if (clk->usecount++ == 0) {
- if (clk->parent) {
- ret = __clk_enable(clk->parent);
- if (unlikely(ret))
- goto err;
- }
-
- if (clk->ops && clk->ops->enable) {
- ret = clk->ops->enable(clk);
- if (ret) {
- if (clk->parent)
- __clk_disable(clk->parent);
- goto err;
- }
- }
- }
-
- return ret;
-err:
- clk->usecount--;
- return ret;
-}
-
-int clk_enable(struct clk *clk)
-{
- unsigned long flags;
- int ret;
-
- if (!clk)
- return -EINVAL;
-
- spin_lock_irqsave(&clock_lock, flags);
- ret = __clk_enable(clk);
- spin_unlock_irqrestore(&clock_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(clk_enable);
-
-static LIST_HEAD(root_clks);
-
-/**
- * recalculate_root_clocks - recalculate and propagate all root clocks
- *
- * Recalculates all root clocks (clocks with no parent), which if the
- * clock's .recalc is set correctly, should also propagate their rates.
- * Called at init.
- */
-void recalculate_root_clocks(void)
-{
- struct clk *clkp;
-
- list_for_each_entry(clkp, &root_clks, sibling) {
- if (clkp->ops && clkp->ops->recalc)
- clkp->rate = clkp->ops->recalc(clkp);
- propagate_rate(clkp);
- }
-}
-
-int clk_register(struct clk *clk)
-{
- if (clk == NULL || IS_ERR(clk))
- return -EINVAL;
-
- /*
- * trap out already registered clocks
- */
- if (clk->node.next || clk->node.prev)
- return 0;
-
- mutex_lock(&clock_list_sem);
-
- INIT_LIST_HEAD(&clk->children);
- clk->usecount = 0;
-
- if (clk->parent)
- list_add(&clk->sibling, &clk->parent->children);
- else
- list_add(&clk->sibling, &root_clks);
-
- list_add(&clk->node, &clock_list);
- if (clk->ops && clk->ops->init)
- clk->ops->init(clk);
- mutex_unlock(&clock_list_sem);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(clk_register);
-
-void clk_unregister(struct clk *clk)
-{
- mutex_lock(&clock_list_sem);
- list_del(&clk->sibling);
- list_del(&clk->node);
- mutex_unlock(&clock_list_sem);
-}
-EXPORT_SYMBOL_GPL(clk_unregister);
-
-static void clk_enable_init_clocks(void)
-{
- struct clk *clkp;
-
- list_for_each_entry(clkp, &clock_list, node)
- if (clkp->flags & CLK_ENABLE_ON_INIT)
- clk_enable(clkp);
-}
-
-unsigned long clk_get_rate(struct clk *clk)
-{
- return clk->rate;
-}
-EXPORT_SYMBOL_GPL(clk_get_rate);
-
-int clk_set_rate(struct clk *clk, unsigned long rate)
-{
- return clk_set_rate_ex(clk, rate, 0);
-}
-EXPORT_SYMBOL_GPL(clk_set_rate);
-
-int clk_set_rate_ex(struct clk *clk, unsigned long rate, int algo_id)
-{
- int ret = -EOPNOTSUPP;
- unsigned long flags;
-
- spin_lock_irqsave(&clock_lock, flags);
-
- if (likely(clk->ops && clk->ops->set_rate)) {
- ret = clk->ops->set_rate(clk, rate, algo_id);
- if (ret != 0)
- goto out_unlock;
- } else {
- clk->rate = rate;
- ret = 0;
- }
-
- if (clk->ops && clk->ops->recalc)
- clk->rate = clk->ops->recalc(clk);
-
- propagate_rate(clk);
-
-out_unlock:
- spin_unlock_irqrestore(&clock_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(clk_set_rate_ex);
-
-int clk_set_parent(struct clk *clk, struct clk *parent)
-{
- unsigned long flags;
- int ret = -EINVAL;
-
- if (!parent || !clk)
- return ret;
- if (clk->parent == parent)
- return 0;
-
- spin_lock_irqsave(&clock_lock, flags);
- if (clk->usecount == 0) {
- if (clk->ops->set_parent)
- ret = clk->ops->set_parent(clk, parent);
- else
- 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);
- propagate_rate(clk);
- }
- } else
- ret = -EBUSY;
- spin_unlock_irqrestore(&clock_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(clk_set_parent);
-
-struct clk *clk_get_parent(struct clk *clk)
-{
- return clk->parent;
-}
-EXPORT_SYMBOL_GPL(clk_get_parent);
-
-long clk_round_rate(struct clk *clk, unsigned long rate)
-{
- if (likely(clk->ops && clk->ops->round_rate)) {
- unsigned long flags, rounded;
-
- spin_lock_irqsave(&clock_lock, flags);
- rounded = clk->ops->round_rate(clk, rate);
- spin_unlock_irqrestore(&clock_lock, flags);
-
- return rounded;
- }
-
- return clk_get_rate(clk);
-}
-EXPORT_SYMBOL_GPL(clk_round_rate);
-
-/*
- * Returns a clock. Note that we first try to use device id on the bus
- * and clock name. If this fails, we try to use clock name only.
- */
-struct clk *clk_get(struct device *dev, const char *con_id)
-{
- const char *dev_id = dev ? dev_name(dev) : NULL;
-
- return clk_get_sys(dev_id, con_id);
-}
-EXPORT_SYMBOL_GPL(clk_get);
-
-void clk_put(struct clk *clk)
-{
-}
-EXPORT_SYMBOL_GPL(clk_put);
-
-#ifdef CONFIG_PM
-static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)
-{
- static pm_message_t prev_state;
- struct clk *clkp;
-
- switch (state.event) {
- case PM_EVENT_ON:
- /* Resumeing from hibernation */
- if (prev_state.event != PM_EVENT_FREEZE)
- break;
-
- list_for_each_entry(clkp, &clock_list, node) {
- if (likely(clkp->ops)) {
- unsigned long rate = clkp->rate;
-
- if (likely(clkp->ops->set_parent))
- clkp->ops->set_parent(clkp,
- clkp->parent);
- if (likely(clkp->ops->set_rate))
- clkp->ops->set_rate(clkp,
- rate, NO_CHANGE);
- else if (likely(clkp->ops->recalc))
- clkp->rate = clkp->ops->recalc(clkp);
- }
- }
- break;
- case PM_EVENT_FREEZE:
- break;
- case PM_EVENT_SUSPEND:
- break;
- }
-
- prev_state = state;
- return 0;
-}
-
-static int clks_sysdev_resume(struct sys_device *dev)
-{
- return clks_sysdev_suspend(dev, PMSG_ON);
-}
-
-static struct sysdev_class clks_sysdev_class = {
- .name = "clks",
-};
-
-static struct sysdev_driver clks_sysdev_driver = {
- .suspend = clks_sysdev_suspend,
- .resume = clks_sysdev_resume,
-};
-
-static struct sys_device clks_sysdev_dev = {
- .cls = &clks_sysdev_class,
-};
-
-static int __init clk_sysdev_init(void)
-{
- sysdev_class_register(&clks_sysdev_class);
- sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);
- sysdev_register(&clks_sysdev_dev);
-
- return 0;
-}
-subsys_initcall(clk_sysdev_init);
-#endif
-
int __init clk_init(void)
{
int ret;
}
/*
- * debugfs support to trace clock tree hierarchy and attributes
+ * Returns a clock. Note that we first try to use device id on the bus
+ * and clock name. If this fails, we try to use clock name only.
*/
-static struct dentry *clk_debugfs_root;
-
-static int clk_debugfs_register_one(struct clk *c)
+struct clk *clk_get(struct device *dev, const char *con_id)
{
- int err;
- struct dentry *d, *child, *child_tmp;
- struct clk *pa = c->parent;
- char s[255];
- char *p = s;
-
- p += sprintf(p, "%s", c->name);
- if (c->id >= 0)
- sprintf(p, ":%d", c->id);
- d = debugfs_create_dir(s, pa ? pa->dentry : clk_debugfs_root);
- if (!d)
- return -ENOMEM;
- c->dentry = d;
-
- d = debugfs_create_u8("usecount", S_IRUGO, c->dentry, (u8 *)&c->usecount);
- if (!d) {
- err = -ENOMEM;
- goto err_out;
- }
- d = debugfs_create_u32("rate", S_IRUGO, c->dentry, (u32 *)&c->rate);
- if (!d) {
- err = -ENOMEM;
- goto err_out;
- }
- d = debugfs_create_x32("flags", S_IRUGO, c->dentry, (u32 *)&c->flags);
- if (!d) {
- err = -ENOMEM;
- goto err_out;
- }
- return 0;
+ const char *dev_id = dev ? dev_name(dev) : NULL;
-err_out:
- d = c->dentry;
- list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
- debugfs_remove(child);
- debugfs_remove(c->dentry);
- return err;
+ return clk_get_sys(dev_id, con_id);
}
+EXPORT_SYMBOL_GPL(clk_get);
-static int clk_debugfs_register(struct clk *c)
+void clk_put(struct clk *clk)
{
- int err;
- struct clk *pa = c->parent;
-
- if (pa && !pa->dentry) {
- err = clk_debugfs_register(pa);
- if (err)
- return err;
- }
-
- if (!c->dentry && c->name) {
- err = clk_debugfs_register_one(c);
- if (err)
- return err;
- }
- return 0;
}
+EXPORT_SYMBOL_GPL(clk_put);
-static int __init clk_debugfs_init(void)
-{
- struct clk *c;
- struct dentry *d;
- int err;
-
- d = debugfs_create_dir("clock", NULL);
- if (!d)
- return -ENOMEM;
- clk_debugfs_root = d;
-
- list_for_each_entry(c, &clock_list, node) {
- err = clk_debugfs_register(c);
- if (err)
- goto err_out;
- }
- return 0;
-err_out:
- debugfs_remove_recursive(clk_debugfs_root);
- return err;
-}
-late_initcall(clk_debugfs_init);
git.openpandora.org / pandora-kernel.git / blobdiff