/*
* linux/arch/arm/plat-omap/clock.c
*
- * Copyright (C) 2004 - 2005 Nokia corporation
+ * 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>
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
+#include <linux/cpufreq.h>
+#include <linux/debugfs.h>
+#include <linux/io.h>
-#include <asm/io.h>
-#include <asm/semaphore.h>
-
-#include <asm/arch/clock.h>
+#include <plat/clock.h>
static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
* 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;
return;
spin_lock_irqsave(&clockfw_lock, flags);
+ if (clk->usecount == 0) {
+ printk(KERN_ERR "Trying disable clock %s with 0 usecount\n",
+ clk->name);
+ WARN_ON(1);
+ goto out;
+ }
+
if (arch_clock->clk_disable)
arch_clock->clk_disable(clk);
- spin_unlock_irqrestore(&clockfw_lock, 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;
+out:
spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
}
-EXPORT_SYMBOL(clk_get_usecount);
+EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
}
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;
unsigned long flags;
int ret = -EINVAL;
+ if (cpu_is_omap44xx())
+ /* OMAP4 clk framework not supported yet */
+ return 0;
if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
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;
+}
+
+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;
- clk->rate = clk->parent->rate;
+ /* 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, &tclk->children, sibling) {
+ if (clkp->recalc)
+ clkp->rate = clkp->recalc(clkp);
+ propagate_rate(clkp);
+ }
+}
- list_for_each_entry(clkp, &clocks, node) {
- if (likely(clkp->parent != tclk))
- continue;
- if (likely((u32)clkp->recalc))
- clkp->recalc(clkp);
+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->recalc)
+ clkp->rate = clkp->recalc(clkp);
+ propagate_rate(clkp);
}
}
+/**
+ * clk_preinit - initialize any fields in the struct clk before clk init
+ * @clk: struct clk * to initialize
+ *
+ * Initialize any struct clk fields needed before normal clk initialization
+ * can run. No return value.
+ */
+void clk_preinit(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)
+void clk_enable_init_clocks(void)
{
- unsigned long flags;
+ struct clk *clkp;
- if (clk == NULL || IS_ERR(clk))
- return;
+ list_for_each_entry(clkp, &clocks, node) {
+ if (clkp->flags & ENABLE_ON_INIT)
+ clk_enable(clkp);
+ }
+}
+
+/*
+ * 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;
spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_deny_idle)
- arch_clock->clk_deny_idle(clk);
+ if (arch_clock->clk_init_cpufreq_table)
+ arch_clock->clk_init_cpufreq_table(table);
spin_unlock_irqrestore(&clockfw_lock, flags);
}
-EXPORT_SYMBOL(clk_deny_idle);
-void clk_allow_idle(struct clk *clk)
+void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
{
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);
+ if (arch_clock->clk_exit_cpufreq_table)
+ arch_clock->clk_exit_cpufreq_table(table);
spin_unlock_irqrestore(&clockfw_lock, flags);
}
-EXPORT_SYMBOL(clk_allow_idle);
+#endif
/*-------------------------------------------------------------------------*/
+#ifdef CONFIG_OMAP_RESET_CLOCKS
+/*
+ * Disable any unused clocks left on by the bootloader
+ */
+static int __init clk_disable_unused(void)
+{
+ struct clk *ck;
+ unsigned long flags;
+
+ list_for_each_entry(ck, &clocks, node) {
+ if (ck->ops == &clkops_null)
+ continue;
+
+ if (ck->usecount > 0 || ck->enable_reg == 0)
+ continue;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_disable_unused)
+ arch_clock->clk_disable_unused(ck);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+ }
+
+ return 0;
+}
+late_initcall(clk_disable_unused);
+#endif
+
int __init clk_init(struct clk_functions * custom_clocks)
{
if (!custom_clocks) {
return 0;
}
+
+#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
+/*
+ * debugfs support to trace clock tree hierarchy and attributes
+ */
+static struct dentry *clk_debugfs_root;
+
+static int clk_debugfs_register_one(struct clk *c)
+{
+ 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->dent : clk_debugfs_root);
+ if (!d)
+ return -ENOMEM;
+ c->dent = d;
+
+ d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usecount);
+ if (!d) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+ d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
+ if (!d) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+ d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags);
+ if (!d) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+ return 0;
+
+err_out:
+ d = c->dent;
+ list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
+ debugfs_remove(child);
+ debugfs_remove(c->dent);
+ return err;
+}
+
+static int clk_debugfs_register(struct clk *c)
+{
+ int err;
+ struct clk *pa = c->parent;
+
+ if (pa && !pa->dent) {
+ err = clk_debugfs_register(pa);
+ if (err)
+ return err;
+ }
+
+ if (!c->dent) {
+ err = clk_debugfs_register_one(c);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
+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, &clocks, 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);
+
+#endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff