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author | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 13:30:20 +0200 |
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committer | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 13:30:20 +0200 |
commit | e7549b926dd3ceec048f5689df90d4ec970c9419 (patch) | |
tree | c8645e0b4343c309aac1a3838a17cfcf0893d7b5 /drivers/sh/clk | |
parent | 499ba610c2829adafbf393c2f3773d73ae4445f3 (diff) | |
download | kernel_samsung_smdk4412-e7549b926dd3ceec048f5689df90d4ec970c9419.zip kernel_samsung_smdk4412-e7549b926dd3ceec048f5689df90d4ec970c9419.tar.gz kernel_samsung_smdk4412-e7549b926dd3ceec048f5689df90d4ec970c9419.tar.bz2 |
more driver stuff from 3.2.72
Diffstat (limited to 'drivers/sh/clk')
-rw-r--r-- | drivers/sh/clk/core.c | 123 |
1 files changed, 39 insertions, 84 deletions
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c index 7e9c399..db257a3 100644 --- a/drivers/sh/clk/core.c +++ b/drivers/sh/clk/core.c @@ -25,7 +25,6 @@ #include <linux/seq_file.h> #include <linux/err.h> #include <linux/io.h> -#include <linux/debugfs.h> #include <linux/cpufreq.h> #include <linux/clk.h> #include <linux/sh_clk.h> @@ -34,6 +33,9 @@ static LIST_HEAD(clock_list); static DEFINE_SPINLOCK(clock_lock); static DEFINE_MUTEX(clock_list_sem); +/* clock disable operations are not passed on to hardware during boot */ +static int allow_disable; + void clk_rate_table_build(struct clk *clk, struct cpufreq_frequency_table *freq_table, int nr_freqs, @@ -170,6 +172,26 @@ long clk_rate_div_range_round(struct clk *clk, unsigned int div_min, return clk_rate_round_helper(&div_range_round); } +static long clk_rate_mult_range_iter(unsigned int pos, + struct clk_rate_round_data *rounder) +{ + return clk_get_rate(rounder->arg) * pos; +} + +long clk_rate_mult_range_round(struct clk *clk, unsigned int mult_min, + unsigned int mult_max, unsigned long rate) +{ + struct clk_rate_round_data mult_range_round = { + .min = mult_min, + .max = mult_max, + .func = clk_rate_mult_range_iter, + .arg = clk_get_parent(clk), + .rate = rate, + }; + + return clk_rate_round_helper(&mult_range_round); +} + int clk_rate_table_find(struct clk *clk, struct cpufreq_frequency_table *freq_table, unsigned long rate) @@ -202,9 +224,6 @@ int clk_reparent(struct clk *child, struct clk *parent) list_add(&child->sibling, &parent->children); child->parent = parent; - /* now do the debugfs renaming to reattach the child - to the proper parent */ - return 0; } @@ -228,7 +247,7 @@ static void __clk_disable(struct clk *clk) return; if (!(--clk->usecount)) { - if (likely(clk->ops && clk->ops->disable)) + if (likely(allow_disable && clk->ops && clk->ops->disable)) clk->ops->disable(clk); if (likely(clk->parent)) __clk_disable(clk->parent); @@ -393,7 +412,7 @@ int clk_register(struct clk *clk) { int ret; - if (clk == NULL || IS_ERR(clk)) + if (IS_ERR_OR_NULL(clk)) return -EINVAL; /* @@ -662,88 +681,24 @@ static int __init clk_syscore_init(void) subsys_initcall(clk_syscore_init); #endif -/* - * 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, "%p", c); - d = debugfs_create_dir(s, pa ? pa->dentry : clk_debugfs_root); - if (!d) - return -ENOMEM; - c->dentry = d; - - d = debugfs_create_u8("usecount", S_IRUGO, c->dentry, (u8 *)&c->usecount); - if (!d) { - err = -ENOMEM; - goto err_out; - } - d = debugfs_create_u32("rate", S_IRUGO, c->dentry, (u32 *)&c->rate); - if (!d) { - err = -ENOMEM; - goto err_out; - } - d = debugfs_create_x32("flags", S_IRUGO, c->dentry, (u32 *)&c->flags); - if (!d) { - err = -ENOMEM; - goto err_out; - } - return 0; - -err_out: - d = c->dentry; - list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child) - debugfs_remove(child); - debugfs_remove(c->dentry); - return err; -} - -static int clk_debugfs_register(struct clk *c) +static int __init clk_late_init(void) { - int err; - struct clk *pa = c->parent; - - if (pa && !pa->dentry) { - err = clk_debugfs_register(pa); - if (err) - return err; - } + unsigned long flags; + struct clk *clk; - if (!c->dentry) { - err = clk_debugfs_register_one(c); - if (err) - return err; - } - return 0; -} + /* disable all clocks with zero use count */ + mutex_lock(&clock_list_sem); + spin_lock_irqsave(&clock_lock, flags); -static int __init clk_debugfs_init(void) -{ - struct clk *c; - struct dentry *d; - int err; + list_for_each_entry(clk, &clock_list, node) + if (!clk->usecount && clk->ops && clk->ops->disable) + clk->ops->disable(clk); - d = debugfs_create_dir("clock", NULL); - if (!d) - return -ENOMEM; - clk_debugfs_root = d; + /* from now on allow clock disable operations */ + allow_disable = 1; - list_for_each_entry(c, &clock_list, node) { - err = clk_debugfs_register(c); - if (err) - goto err_out; - } + spin_unlock_irqrestore(&clock_lock, flags); + mutex_unlock(&clock_list_sem); return 0; -err_out: - debugfs_remove_recursive(clk_debugfs_root); - return err; } -late_initcall(clk_debugfs_init); +late_initcall(clk_late_init); |