-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);
-
-/*
- * Find the correct struct clk for the device and connection ID.
- * We do slightly fuzzy matching here:
- * An entry with a NULL ID is assumed to be a wildcard.
- * If an entry has a device ID, it must match
- * If an entry has a connection ID, it must match
- * Then we take the most specific entry - with the following
- * order of precedence: dev+con > dev only > con only.
- */
-static struct clk *clk_find(const char *dev_id, const char *con_id)
-{
- struct clk_lookup *p;
- struct clk *clk = NULL;
- int match, best = 0;
-
- list_for_each_entry(p, &clock_list, node) {
- match = 0;
- if (p->dev_id) {
- if (!dev_id || strcmp(p->dev_id, dev_id))
- continue;
- match += 2;
- }
- if (p->con_id) {
- if (!con_id || strcmp(p->con_id, con_id))
- continue;
- match += 1;
- }
- if (match == 0)
- continue;
-
- if (match > best) {
- clk = p->clk;
- best = match;
- }
- }
- return clk;
-}
-
-struct clk *clk_get_sys(const char *dev_id, const char *con_id)
-{
- struct clk *clk;
-
- mutex_lock(&clock_list_sem);
- clk = clk_find(dev_id, con_id);
- mutex_unlock(&clock_list_sem);
-
- return clk ? clk : ERR_PTR(-ENOENT);
-}
-EXPORT_SYMBOL_GPL(clk_get_sys);
-
-/*
- * 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 *id)
-{
- const char *dev_id = dev ? dev_name(dev) : NULL;
- struct clk *p, *clk = ERR_PTR(-ENOENT);
- int idno;
-
- clk = clk_get_sys(dev_id, id);
- if (clk && !IS_ERR(clk))
- return clk;
-
- if (dev == NULL || dev->bus != &platform_bus_type)
- idno = -1;
- else
- idno = to_platform_device(dev)->id;
-
- mutex_lock(&clock_list_sem);
- list_for_each_entry(p, &clock_list, node) {
- if (p->id == idno &&
- strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
- clk = p;
- goto found;
- }
- }
-
- list_for_each_entry(p, &clock_list, node) {
- if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
- clk = p;
- break;
- }
- }
-
-found:
- mutex_unlock(&clock_list_sem);
-
- return clk;
-}
-EXPORT_SYMBOL_GPL(clk_get);
-
-void clk_put(struct clk *clk)
-{
- if (clk && !IS_ERR(clk))
- module_put(clk->owner);
-}
-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
-