ARM: OMAP: Add function to print clock usecounts

[linux-2.6-omap-h63xx.git] / arch / arm / plat-omap / clock.c

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index 7f45c7c3e673d1898902fbac743de5e7cb655fd8..3d017b04784bc76265a4e22841df6e8e7dc1f6b0 100644 (file)
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -33,6 +33,41 @@ static DEFINE_SPINLOCK(clockfw_lock);
 
 static struct clk_functions *arch_clock;
 
+#ifdef CONFIG_PM_DEBUG
+
+static void print_parents(struct clk *clk)
+{
+       struct clk *p;
+       int printed = 0;
+
+       list_for_each_entry(p, &clocks, node) {
+               if (p->parent == clk && p->usecount) {
+                       if (!clk->usecount && !printed) {
+                               printk("MISMATCH: %s\n", clk->name);
+                               printed = 1;
+                       }
+                       printk("\t%-15s\n", p->name);
+               }
+       }
+}
+
+void clk_print_usecounts(void)
+{
+       unsigned long flags;
+       struct clk *p;
+
+       spin_lock_irqsave(&clockfw_lock, flags);
+       list_for_each_entry(p, &clocks, node) {
+               if (p->usecount)
+                       printk("%-15s: %d\n", p->name, p->usecount);
+               print_parents(p);
+
+       }
+       spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+
+#endif
+
 /*-------------------------------------------------------------------------
  * Standard clock functions defined in include/linux/clk.h
  *-------------------------------------------------------------------------*/
@@ -100,6 +135,7 @@ void clk_disable(struct clk *clk)
                return;
 
        spin_lock_irqsave(&clockfw_lock, flags);
+       BUG_ON(clk->usecount == 0);
        if (arch_clock->clk_disable)
                arch_clock->clk_disable(clk);
        spin_unlock_irqrestore(&clockfw_lock, flags);
@@ -322,6 +358,31 @@ EXPORT_SYMBOL(clk_allow_idle);
 
 /*-------------------------------------------------------------------------*/
 
+#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) {