diff options
Diffstat (limited to 'arch/arm/plat-omap/clock.c')
| -rw-r--r-- | arch/arm/plat-omap/clock.c | 182 |
1 files changed, 144 insertions, 38 deletions
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c index 0a603242f367..c2e741de0203 100644 --- a/arch/arm/plat-omap/clock.c +++ b/arch/arm/plat-omap/clock.c @@ -1,7 +1,7 @@ /* * 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> @@ -21,9 +21,10 @@ #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> @@ -33,41 +34,6 @@ 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 *-------------------------------------------------------------------------*/ @@ -135,9 +101,17 @@ void clk_disable(struct clk *clk) return; spin_lock_irqsave(&clockfw_lock, flags); - BUG_ON(clk->usecount == 0); + 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); @@ -304,6 +278,23 @@ void propagate_rate(struct clk * tclk) } } +/** + * 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)) @@ -358,6 +349,30 @@ void clk_allow_idle(struct clk *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 @@ -396,3 +411,94 @@ int __init clk_init(struct clk_functions * 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) */ |
