#include <linux/string.h>
#include <linux/clk.h>
#include <linux/mutex.h>
+#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/semaphore.h>
* Standard clock functions defined in include/linux/clk.h
*-------------------------------------------------------------------------*/
+/*
+ * 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(&clocks_mutex);
+
+ list_for_each_entry(p, &clocks, node) {
+ if (p->id == idno &&
+ strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+ clk = p;
+ goto found;
+ }
+ }
+
list_for_each_entry(p, &clocks, node) {
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
clk = p;
break;
}
}
+
+found:
mutex_unlock(&clocks_mutex);
return clk;
unsigned long flags;
int ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_enable)
ret = arch_clock->clk_enable(clk);
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_disable)
arch_clock->clk_disable(clk);
unsigned long flags;
int ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return 0;
+
spin_lock_irqsave(&clockfw_lock, flags);
ret = clk->usecount;
spin_unlock_irqrestore(&clockfw_lock, flags);
unsigned long flags;
unsigned long ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return 0;
+
spin_lock_irqsave(&clockfw_lock, flags);
ret = clk->rate;
spin_unlock_irqrestore(&clockfw_lock, flags);
unsigned long flags;
long ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_round_rate)
ret = arch_clock->clk_round_rate(clk, rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
- int ret = 0;
+ int ret = -EINVAL;
+
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_set_rate)
int clk_set_parent(struct clk *clk, struct clk *parent)
{
unsigned long flags;
- int ret = 0;
+ int ret = -EINVAL;
+
+ if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
+ return ret;
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_set_parent)
unsigned long flags;
struct clk * ret = NULL;
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_get_parent)
ret = arch_clock->clk_get_parent(clk);
/* Used for clocks that always have same value as the parent clock */
void followparent_recalc(struct clk *clk)
{
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
clk->rate = clk->parent->rate;
}
{
struct clk *clkp;
+ if (tclk == NULL || IS_ERR(tclk))
+ return;
+
list_for_each_entry(clkp, &clocks, node) {
if (likely(clkp->parent != tclk))
continue;
int clk_register(struct clk *clk)
{
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
mutex_lock(&clocks_mutex);
list_add(&clk->node, &clocks);
if (clk->init)
void clk_unregister(struct clk *clk)
{
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
mutex_lock(&clocks_mutex);
list_del(&clk->node);
mutex_unlock(&clocks_mutex);
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_deny_idle)
arch_clock->clk_deny_idle(clk);
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_allow_idle)
arch_clock->clk_allow_idle(clk);
return 0;
}
+
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+static void *omap_ck_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *omap_ck_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return NULL;
+}
+
+static void omap_ck_stop(struct seq_file *m, void *v)
+{
+}
+
+int omap_ck_show(struct seq_file *m, void *v)
+{
+ struct clk *cp;
+
+ list_for_each_entry(cp, &clocks, node)
+ seq_printf(m,"%s %ld %d\n", cp->name, cp->rate, cp->usecount);
+
+ return 0;
+}
+
+static struct seq_operations omap_ck_op = {
+ .start = omap_ck_start,
+ .next = omap_ck_next,
+ .stop = omap_ck_stop,
+ .show = omap_ck_show
+};
+
+static int omap_ck_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &omap_ck_op);
+}
+
+static struct file_operations proc_omap_ck_operations = {
+ .open = omap_ck_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+int __init omap_ck_init(void)
+{
+ struct proc_dir_entry *entry;
+
+ entry = create_proc_entry("omap_clocks", 0, NULL);
+ if (entry)
+ entry->proc_fops = &proc_omap_ck_operations;
+ return 0;
+
+}
+__initcall(omap_ck_init);
+#endif /* CONFIG_DEBUG_PROC_FS */
+