diff options
Diffstat (limited to 'arch/arm/plat-spear/clock.c')
| -rw-r--r-- | arch/arm/plat-spear/clock.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/arm/plat-spear/clock.c b/arch/arm/plat-spear/clock.c index 7e7ab606dc49..bdbd7ec9cb6b 100644 --- a/arch/arm/plat-spear/clock.c +++ b/arch/arm/plat-spear/clock.c @@ -13,6 +13,7 @@ #include <linux/bug.h> #include <linux/clk.h> +#include <linux/debugfs.h> #include <linux/err.h> #include <linux/io.h> #include <linux/list.h> @@ -22,8 +23,14 @@ static DEFINE_SPINLOCK(clocks_lock); static LIST_HEAD(root_clks); +#ifdef CONFIG_DEBUG_FS +static LIST_HEAD(clocks); +#endif static void propagate_rate(struct clk *, int on_init); +#ifdef CONFIG_DEBUG_FS +static int clk_debugfs_reparent(struct clk *); +#endif static int generic_clk_enable(struct clk *clk) { @@ -96,6 +103,10 @@ static void clk_reparent(struct clk *clk, struct pclk_info *pclk_info) clk->pclk = pclk_info->pclk; spin_unlock_irqrestore(&clocks_lock, flags); + +#ifdef CONFIG_DEBUG_FS + clk_debugfs_reparent(clk); +#endif } static void do_clk_disable(struct clk *clk) @@ -336,6 +347,12 @@ void clk_register(struct clk_lookup *cl) spin_unlock_irqrestore(&clocks_lock, flags); + /* debugfs specific */ +#ifdef CONFIG_DEBUG_FS + list_add(&clk->node, &clocks); + clk->cl = cl; +#endif + /* add clock to arm clockdev framework */ clkdev_add(cl); } @@ -885,3 +902,102 @@ void recalc_root_clocks(void) } spin_unlock_irqrestore(&clocks_lock, flags); } + +#ifdef 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->pclk; + char s[255]; + char *p = s; + + if (c) { + if (c->cl->con_id) + p += sprintf(p, "%s", c->cl->con_id); + if (c->cl->dev_id) + p += sprintf(p, "%s", c->cl->dev_id); + } + d = debugfs_create_dir(s, pa ? pa->dent : clk_debugfs_root); + if (!d) + return -ENOMEM; + c->dent = d; + + d = debugfs_create_u32("usage_count", S_IRUGO, c->dent, + (u32 *)&c->usage_count); + 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(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->pclk; + + 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); + +static int clk_debugfs_reparent(struct clk *c) +{ + debugfs_remove(c->dent); + return clk_debugfs_register_one(c); +} +#endif /* CONFIG_DEBUG_FS */ |