diff options
| -rw-r--r-- | arch/arm/plat-samsung/clock.c | 92 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/clock.h | 3 |
2 files changed, 95 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/clock.c b/arch/arm/plat-samsung/clock.c index e8d20b0..7728928 100644 --- a/arch/arm/plat-samsung/clock.c +++ b/arch/arm/plat-samsung/clock.c @@ -39,6 +39,9 @@ #include <linux/clk.h> #include <linux/spinlock.h> #include <linux/io.h> +#if defined(CONFIG_DEBUG_FS) +#include <linux/debugfs.h> +#endif #include <mach/hardware.h> #include <asm/irq.h> @@ -447,3 +450,92 @@ int __init s3c24xx_register_baseclocks(unsigned long xtal) 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->usage); + 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; + } + 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, list) { + 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) */ diff --git a/arch/arm/plat-samsung/include/plat/clock.h b/arch/arm/plat-samsung/include/plat/clock.h index 0fbcd0e..9a82b88 100644 --- a/arch/arm/plat-samsung/include/plat/clock.h +++ b/arch/arm/plat-samsung/include/plat/clock.h @@ -47,6 +47,9 @@ struct clk { struct clk_ops *ops; int (*enable)(struct clk *, int enable); +#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) + struct dentry *dent; /* For visible tree hierarchy */ +#endif }; /* other clocks which may be registered by board support */ |