/*
* 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>
* published by the Free Software Foundation.
*/
#include <linux/version.h>
-#include <linux/config.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 <asm/io.h>
-#include <asm/semaphore.h>
-#include <asm/arch/clock.h>
+#include <mach/clock.h>
-LIST_HEAD(clocks);
+static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
-DEFINE_SPINLOCK(clockfw_lock);
+static DEFINE_SPINLOCK(clockfw_lock);
static struct clk_functions *arch_clock;
if (p->id == idno &&
strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
clk = p;
- break;
+ goto found;
}
}
}
}
+found:
mutex_unlock(&clocks_mutex);
return clk;
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);
+
+out:
spin_unlock_irqrestore(&clockfw_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
return;
clk->rate = clk->parent->rate;
+ if (unlikely(clk->flags & RATE_PROPAGATES))
+ propagate_rate(clk);
}
/* Propagate rate to children */
}
}
+/**
+ * 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, &clocks, node) {
+ if (unlikely(!clkp->parent) && likely((u32)clkp->recalc))
+ clkp->recalc(clkp);
+ }
+}
+
int clk_register(struct clk *clk)
{
if (clk == NULL || IS_ERR(clk))
}
EXPORT_SYMBOL(clk_allow_idle);
+void clk_enable_init_clocks(void)
+{
+ struct clk *clkp;
+
+ list_for_each_entry(clkp, &clocks, node) {
+ if (clkp->flags & ENABLE_ON_INIT)
+ clk_enable(clkp);
+ }
+}
+EXPORT_SYMBOL(clk_enable_init_clocks);
+
+#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_init_cpufreq_table)
+ arch_clock->clk_init_cpufreq_table(table);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_init_cpufreq_table);
+#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->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
+ 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;
+ 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 (IS_ERR(d))
+ return PTR_ERR(d);
+ c->dent = d;
+
+ d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usecount);
+ if (IS_ERR(d)) {
+ err = PTR_ERR(d);
+ goto err_out;
+ }
+ d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
+ if (IS_ERR(d)) {
+ err = PTR_ERR(d);
+ goto err_out;
+ }
+ d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags);
+ if (IS_ERR(d)) {
+ err = PTR_ERR(d);
+ goto err_out;
+ }
+ return 0;
+
+err_out:
+ d = c->dent;
+ list_for_each_entry(child, &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 (IS_ERR(d))
+ return PTR_ERR(d);
+ 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(clk_debugfs_root); /* REVISIT: Cleanup correctly */
+ 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