* Standard clock functions defined in include/linux/clk.h
*-------------------------------------------------------------------------*/
-/*
- * 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)
-{
- struct clk *p, *clk = ERR_PTR(-ENOENT);
- int idno;
-
- if (dev == NULL || dev->bus != &platform_bus_type)
- idno = -1;
- else
- idno = to_platform_device(dev)->id;
-
- mutex_lock(&clocks_mutex);
-
- list_for_each_entry(p, &clocks, node) {
- if (p->id == idno &&
- strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
- clk = p;
- goto found;
- }
- }
-
- list_for_each_entry(p, &clocks, node) {
- if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
- clk = p;
- break;
- }
- }
-
-found:
- mutex_unlock(&clocks_mutex);
-
- return clk;
-}
-EXPORT_SYMBOL(clk_get);
-
int clk_enable(struct clk *clk)
{
unsigned long flags;
}
EXPORT_SYMBOL(clk_disable);
-int clk_get_usecount(struct clk *clk)
-{
- unsigned long flags;
- int ret = 0;
-
- if (clk == NULL || IS_ERR(clk))
- return 0;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- ret = clk->usecount;
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_get_usecount);
-
unsigned long clk_get_rate(struct clk *clk)
{
unsigned long flags;
}
EXPORT_SYMBOL(clk_get_rate);
-void clk_put(struct clk *clk)
-{
- if (clk && !IS_ERR(clk))
- module_put(clk->owner);
-}
-EXPORT_SYMBOL(clk_put);
-
/*-------------------------------------------------------------------------
* Optional clock functions defined in include/linux/clk.h
*-------------------------------------------------------------------------*/
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_set_rate)
ret = arch_clock->clk_set_rate(clk, rate);
+ if (ret == 0) {
+ if (clk->recalc)
+ clk->rate = clk->recalc(clk);
+ propagate_rate(clk);
+ }
spin_unlock_irqrestore(&clockfw_lock, flags);
return ret;
return ret;
spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_set_parent)
- ret = arch_clock->clk_set_parent(clk, parent);
+ if (clk->usecount == 0) {
+ if (arch_clock->clk_set_parent)
+ ret = arch_clock->clk_set_parent(clk, parent);
+ if (ret == 0) {
+ if (clk->recalc)
+ clk->rate = clk->recalc(clk);
+ propagate_rate(clk);
+ }
+ } else
+ ret = -EBUSY;
spin_unlock_irqrestore(&clockfw_lock, flags);
return ret;
struct clk *clk_get_parent(struct clk *clk)
{
- unsigned long flags;
- struct clk * ret = NULL;
-
- if (clk == NULL || IS_ERR(clk))
- return ret;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_get_parent)
- ret = arch_clock->clk_get_parent(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
+ return clk->parent;
}
EXPORT_SYMBOL(clk_get_parent);
__setup("mpurate=", omap_clk_setup);
/* Used for clocks that always have same value as the parent clock */
-void followparent_recalc(struct clk *clk)
+unsigned long followparent_recalc(struct clk *clk)
{
- if (clk == NULL || IS_ERR(clk))
- return;
+ return clk->parent->rate;
+}
- clk->rate = clk->parent->rate;
- if (unlikely(clk->flags & RATE_PROPAGATES))
- propagate_rate(clk);
+void 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 */
}
/* Propagate rate to children */
{
struct clk *clkp;
- if (tclk == NULL || IS_ERR(tclk))
- return;
-
- list_for_each_entry(clkp, &clocks, node) {
- if (likely(clkp->parent != tclk))
- continue;
- if (likely((u32)clkp->recalc))
- clkp->recalc(clkp);
+ list_for_each_entry(clkp, &tclk->children, sibling) {
+ if (clkp->recalc)
+ clkp->rate = clkp->recalc(clkp);
+ propagate_rate(clkp);
}
}
+static LIST_HEAD(root_clks);
+
/**
* recalculate_root_clocks - recalculate and propagate all root clocks
*
{
struct clk *clkp;
- list_for_each_entry(clkp, &clocks, node) {
- if (unlikely(!clkp->parent) && likely((u32)clkp->recalc))
- clkp->recalc(clkp);
+ list_for_each_entry(clkp, &root_clks, sibling) {
+ if (clkp->recalc)
+ clkp->rate = clkp->recalc(clkp);
+ propagate_rate(clkp);
}
}
+void clk_init_one(struct clk *clk)
+{
+ INIT_LIST_HEAD(&clk->children);
+}
+
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(&clocks_mutex);
+ if (clk->parent)
+ list_add(&clk->sibling, &clk->parent->children);
+ else
+ list_add(&clk->sibling, &root_clks);
+
list_add(&clk->node, &clocks);
if (clk->init)
clk->init(clk);
return;
mutex_lock(&clocks_mutex);
+ list_del(&clk->sibling);
list_del(&clk->node);
mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clk_unregister);
-void clk_deny_idle(struct clk *clk)
-{
- unsigned long flags;
-
- if (clk == NULL || IS_ERR(clk))
- return;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_deny_idle)
- arch_clock->clk_deny_idle(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-}
-EXPORT_SYMBOL(clk_deny_idle);
-
-void clk_allow_idle(struct clk *clk)
-{
- unsigned long flags;
-
- if (clk == NULL || IS_ERR(clk))
- return;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_allow_idle)
- arch_clock->clk_allow_idle(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-}
-EXPORT_SYMBOL(clk_allow_idle);
-
void clk_enable_init_clocks(void)
{
struct clk *clkp;
}
EXPORT_SYMBOL(clk_enable_init_clocks);
+/*
+ * Low level helpers
+ */
+static int clkll_enable_null(struct clk *clk)
+{
+ return 0;
+}
+
+static void clkll_disable_null(struct clk *clk)
+{
+}
+
+const struct clkops clkops_null = {
+ .enable = clkll_enable_null,
+ .disable = clkll_disable_null,
+};
+
#ifdef CONFIG_CPU_FREQ
void clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
{
unsigned long flags;
list_for_each_entry(ck, &clocks, node) {
- if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
- ck->enable_reg == 0)
+ if (ck->ops == &clkops_null)
+ continue;
+
+ if (ck->usecount > 0 || ck->enable_reg == 0)
continue;
spin_lock_irqsave(&clockfw_lock, flags);
projects / linux-2.6-omap-h63xx.git / blobdiff