/*
* arch/sh/kernel/cpu/clock.c - SuperH clock framework
*
- * Copyright (C) 2005 Paul Mundt
+ * Copyright (C) 2005, 2006, 2007 Paul Mundt
*
* This clock framework is derived from the OMAP version by:
*
- * Copyright (C) 2004 Nokia Corporation
+ * Copyright (C) 2004 - 2005 Nokia Corporation
* Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
*
+ * Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com>
+ *
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/seq_file.h>
#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/proc_fs.h>
#include <asm/clock.h>
#include <asm/timer.h>
static LIST_HEAD(clock_list);
static DEFINE_SPINLOCK(clock_lock);
-static DECLARE_MUTEX(clock_list_sem);
+static DEFINE_MUTEX(clock_list_sem);
/*
* Each subtype is expected to define the init routines for these clocks,
if (clk->ops && clk->ops->init)
clk->ops->init(clk);
+ kref_get(&clk->kref);
+
if (clk->flags & CLK_ALWAYS_ENABLED)
return 0;
if (likely(clk->ops && clk->ops->enable))
clk->ops->enable(clk);
- kref_get(&clk->kref);
return 0;
}
+EXPORT_SYMBOL_GPL(__clk_enable);
int clk_enable(struct clk *clk)
{
return ret;
}
+EXPORT_SYMBOL_GPL(clk_enable);
static void clk_kref_release(struct kref *kref)
{
void __clk_disable(struct clk *clk)
{
+ int count = kref_put(&clk->kref, clk_kref_release);
+
if (clk->flags & CLK_ALWAYS_ENABLED)
return;
- kref_put(&clk->kref, clk_kref_release);
+ if (!count) { /* count reaches zero, disable the clock */
+ if (likely(clk->ops && clk->ops->disable))
+ clk->ops->disable(clk);
+ }
}
+EXPORT_SYMBOL_GPL(__clk_disable);
void clk_disable(struct clk *clk)
{
__clk_disable(clk);
spin_unlock_irqrestore(&clock_lock, flags);
}
+EXPORT_SYMBOL_GPL(clk_disable);
int clk_register(struct clk *clk)
{
- down(&clock_list_sem);
+ mutex_lock(&clock_list_sem);
list_add(&clk->node, &clock_list);
kref_init(&clk->kref);
- up(&clock_list_sem);
+ mutex_unlock(&clock_list_sem);
+
+ if (clk->flags & CLK_ALWAYS_ENABLED) {
+ pr_debug( "Clock '%s' is ALWAYS_ENABLED\n", clk->name);
+ if (clk->ops && clk->ops->init)
+ clk->ops->init(clk);
+ if (clk->ops && clk->ops->enable)
+ clk->ops->enable(clk);
+ pr_debug( "Enabled.");
+ }
return 0;
}
+EXPORT_SYMBOL_GPL(clk_register);
void clk_unregister(struct clk *clk)
{
- down(&clock_list_sem);
+ mutex_lock(&clock_list_sem);
list_del(&clk->node);
- up(&clock_list_sem);
+ mutex_unlock(&clock_list_sem);
}
+EXPORT_SYMBOL_GPL(clk_unregister);
-inline unsigned long clk_get_rate(struct clk *clk)
+unsigned long clk_get_rate(struct clk *clk)
{
return clk->rate;
}
+EXPORT_SYMBOL_GPL(clk_get_rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+ return clk_set_rate_ex(clk, rate, 0);
+}
+EXPORT_SYMBOL_GPL(clk_set_rate);
+
+int clk_set_rate_ex(struct clk *clk, unsigned long rate, int algo_id)
{
int ret = -EOPNOTSUPP;
unsigned long flags;
spin_lock_irqsave(&clock_lock, flags);
- ret = clk->ops->set_rate(clk, rate);
+ ret = clk->ops->set_rate(clk, rate, algo_id);
spin_unlock_irqrestore(&clock_lock, flags);
}
return ret;
}
+EXPORT_SYMBOL_GPL(clk_set_rate_ex);
void clk_recalc_rate(struct clk *clk)
{
if (unlikely(clk->flags & CLK_RATE_PROPAGATES))
propagate_rate(clk);
}
+EXPORT_SYMBOL_GPL(clk_recalc_rate);
-struct clk *clk_get(const char *id)
+/*
+ * Returns a clock. Note that we first try to use device id on the bus
+ * and clock name. If this fails, we try to use clock name only.
+ */
+struct clk *clk_get(struct device *dev, const char *id)
{
struct clk *p, *clk = ERR_PTR(-ENOENT);
+ int idno;
+
+ if (dev == NULL || dev->bus != &platform_bus_type)
+ idno = -1;
+ else
+ idno = to_platform_device(dev)->id;
+
+ mutex_lock(&clock_list_sem);
+ list_for_each_entry(p, &clock_list, node) {
+ if (p->id == idno &&
+ strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+ clk = p;
+ goto found;
+ }
+ }
- down(&clock_list_sem);
list_for_each_entry(p, &clock_list, node) {
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
clk = p;
break;
}
}
- up(&clock_list_sem);
+
+found:
+ mutex_unlock(&clock_list_sem);
return clk;
}
+EXPORT_SYMBOL_GPL(clk_get);
void clk_put(struct clk *clk)
{
if (clk && !IS_ERR(clk))
module_put(clk->owner);
}
+EXPORT_SYMBOL_GPL(clk_put);
void __init __attribute__ ((weak))
arch_init_clk_ops(struct clk_ops **ops, int type)
{
}
+static int show_clocks(char *buf, char **start, off_t off,
+ int len, int *eof, void *data)
+{
+ struct clk *clk;
+ char *p = buf;
+
+ list_for_each_entry_reverse(clk, &clock_list, node) {
+ unsigned long rate = clk_get_rate(clk);
+
+ /*
+ * Don't bother listing dummy clocks with no ancestry
+ * that only support enable and disable ops.
+ */
+ if (unlikely(!rate && !clk->parent))
+ continue;
+
+ p += sprintf(p, "%-12s\t: %ld.%02ldMHz\n", clk->name,
+ rate / 1000000, (rate % 1000000) / 10000);
+ }
+
+ return p - buf;
+}
+
int __init clk_init(void)
{
int i, ret = 0;
- BUG_ON(unlikely(!master_clk.rate));
+ BUG_ON(!master_clk.rate);
for (i = 0; i < ARRAY_SIZE(onchip_clocks); i++) {
struct clk *clk = onchip_clocks[i];
arch_init_clk_ops(&clk->ops, i);
ret |= clk_register(clk);
- clk_enable(clk);
}
/* Kick the child clocks.. */
return ret;
}
-int show_clocks(struct seq_file *m)
+static int __init clk_proc_init(void)
{
- struct clk *clk;
-
- list_for_each_entry_reverse(clk, &clock_list, node) {
- unsigned long rate = clk_get_rate(clk);
-
- /*
- * Don't bother listing dummy clocks with no ancestry
- * that only support enable and disable ops.
- */
- if (unlikely(!rate && !clk->parent))
- continue;
-
- seq_printf(m, "%-12s\t: %ld.%02ldMHz\n", clk->name,
- rate / 1000000, (rate % 1000000) / 10000);
- }
+ struct proc_dir_entry *p;
+ p = create_proc_read_entry("clocks", S_IRUSR, NULL,
+ show_clocks, NULL);
+ if (unlikely(!p))
+ return -EINVAL;
return 0;
}
-
-EXPORT_SYMBOL_GPL(clk_register);
-EXPORT_SYMBOL_GPL(clk_unregister);
-EXPORT_SYMBOL_GPL(clk_get);
-EXPORT_SYMBOL_GPL(clk_put);
-EXPORT_SYMBOL_GPL(clk_enable);
-EXPORT_SYMBOL_GPL(clk_disable);
-EXPORT_SYMBOL_GPL(__clk_enable);
-EXPORT_SYMBOL_GPL(__clk_disable);
-EXPORT_SYMBOL_GPL(clk_get_rate);
-EXPORT_SYMBOL_GPL(clk_set_rate);
-EXPORT_SYMBOL_GPL(clk_recalc_rate);
+subsys_initcall(clk_proc_init);
projects / linux-drm-fsl-dcu.git / blobdiff