2 * linux/arch/arm/mach-sa1100/clock.c
4 #include <linux/module.h>
5 #include <linux/kernel.h>
6 #include <linux/list.h>
7 #include <linux/errno.h>
9 #include <linux/string.h>
10 #include <linux/clk.h>
11 #include <linux/spinlock.h>
12 #include <linux/platform_device.h>
13 #include <linux/delay.h>
15 #include <mach/pxa2xx-regs.h>
16 #include <mach/hardware.h>
22 static LIST_HEAD(clocks);
23 static DEFINE_MUTEX(clocks_mutex);
24 static DEFINE_SPINLOCK(clocks_lock);
26 static struct clk *clk_lookup(struct device *dev, const char *id)
30 list_for_each_entry(p, &clocks, node)
31 if (strcmp(id, p->name) == 0 && p->dev == dev)
37 struct clk *clk_get(struct device *dev, const char *id)
39 struct clk *p, *clk = ERR_PTR(-ENOENT);
41 mutex_lock(&clocks_mutex);
42 p = clk_lookup(dev, id);
44 p = clk_lookup(NULL, id);
47 mutex_unlock(&clocks_mutex);
49 if (!IS_ERR(clk) && clk->ops == NULL)
54 EXPORT_SYMBOL(clk_get);
56 void clk_put(struct clk *clk)
59 EXPORT_SYMBOL(clk_put);
61 int clk_enable(struct clk *clk)
65 spin_lock_irqsave(&clocks_lock, flags);
66 if (clk->enabled++ == 0)
67 clk->ops->enable(clk);
68 spin_unlock_irqrestore(&clocks_lock, flags);
75 EXPORT_SYMBOL(clk_enable);
77 void clk_disable(struct clk *clk)
81 WARN_ON(clk->enabled == 0);
83 spin_lock_irqsave(&clocks_lock, flags);
84 if (--clk->enabled == 0)
85 clk->ops->disable(clk);
86 spin_unlock_irqrestore(&clocks_lock, flags);
88 EXPORT_SYMBOL(clk_disable);
90 unsigned long clk_get_rate(struct clk *clk)
95 if (clk->ops->getrate)
96 rate = clk->ops->getrate(clk);
100 EXPORT_SYMBOL(clk_get_rate);
103 void clk_cken_enable(struct clk *clk)
105 CKEN |= 1 << clk->cken;
108 void clk_cken_disable(struct clk *clk)
110 CKEN &= ~(1 << clk->cken);
113 const struct clkops clk_cken_ops = {
114 .enable = clk_cken_enable,
115 .disable = clk_cken_disable,
118 void clks_register(struct clk *clks, size_t num)
122 mutex_lock(&clocks_mutex);
123 for (i = 0; i < num; i++)
124 list_add(&clks[i].node, &clocks);
125 mutex_unlock(&clocks_mutex);
128 int clk_add_alias(char *alias, struct device *alias_dev, char *id,
131 struct clk *r = clk_lookup(dev, id);
137 new = kzalloc(sizeof(struct clk), GFP_KERNEL);
143 new->dev = alias_dev;
146 mutex_lock(&clocks_mutex);
147 list_add(&new->node, &clocks);
148 mutex_unlock(&clocks_mutex);