x86, efi: Set runtime_version to the EFI spec revision
[linux/fpc-iii.git] / arch / m68k / platform / coldfire / clk.c
blobfddfdccae63b19c0500ed042459ba84e84c2002e
1 /***************************************************************************/
3 /*
4 * clk.c -- general ColdFire CPU kernel clk handling
6 * Copyright (C) 2009, Greg Ungerer (gerg@snapgear.com)
7 */
9 /***************************************************************************/
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/mutex.h>
15 #include <linux/clk.h>
16 #include <linux/io.h>
17 #include <linux/err.h>
18 #include <asm/coldfire.h>
19 #include <asm/mcfsim.h>
20 #include <asm/mcfclk.h>
22 static DEFINE_SPINLOCK(clk_lock);
24 #ifdef MCFPM_PPMCR0
26 * For more advanced ColdFire parts that have clocks that can be enabled
27 * we supply enable/disable functions. These must properly define their
28 * clocks in their platform specific code.
30 void __clk_init_enabled(struct clk *clk)
32 clk->enabled = 1;
33 clk->clk_ops->enable(clk);
36 void __clk_init_disabled(struct clk *clk)
38 clk->enabled = 0;
39 clk->clk_ops->disable(clk);
42 static void __clk_enable0(struct clk *clk)
44 __raw_writeb(clk->slot, MCFPM_PPMCR0);
47 static void __clk_disable0(struct clk *clk)
49 __raw_writeb(clk->slot, MCFPM_PPMSR0);
52 struct clk_ops clk_ops0 = {
53 .enable = __clk_enable0,
54 .disable = __clk_disable0,
57 #ifdef MCFPM_PPMCR1
58 static void __clk_enable1(struct clk *clk)
60 __raw_writeb(clk->slot, MCFPM_PPMCR1);
63 static void __clk_disable1(struct clk *clk)
65 __raw_writeb(clk->slot, MCFPM_PPMSR1);
68 struct clk_ops clk_ops1 = {
69 .enable = __clk_enable1,
70 .disable = __clk_disable1,
72 #endif /* MCFPM_PPMCR1 */
73 #endif /* MCFPM_PPMCR0 */
75 struct clk *clk_get(struct device *dev, const char *id)
77 const char *clk_name = dev ? dev_name(dev) : id ? id : NULL;
78 struct clk *clk;
79 unsigned i;
81 for (i = 0; (clk = mcf_clks[i]) != NULL; ++i)
82 if (!strcmp(clk->name, clk_name))
83 return clk;
84 pr_warn("clk_get: didn't find clock %s\n", clk_name);
85 return ERR_PTR(-ENOENT);
87 EXPORT_SYMBOL(clk_get);
89 int clk_enable(struct clk *clk)
91 unsigned long flags;
92 spin_lock_irqsave(&clk_lock, flags);
93 if ((clk->enabled++ == 0) && clk->clk_ops)
94 clk->clk_ops->enable(clk);
95 spin_unlock_irqrestore(&clk_lock, flags);
97 return 0;
99 EXPORT_SYMBOL(clk_enable);
101 void clk_disable(struct clk *clk)
103 unsigned long flags;
104 spin_lock_irqsave(&clk_lock, flags);
105 if ((--clk->enabled == 0) && clk->clk_ops)
106 clk->clk_ops->disable(clk);
107 spin_unlock_irqrestore(&clk_lock, flags);
109 EXPORT_SYMBOL(clk_disable);
111 void clk_put(struct clk *clk)
113 if (clk->enabled != 0)
114 pr_warn("clk_put %s still enabled\n", clk->name);
116 EXPORT_SYMBOL(clk_put);
118 unsigned long clk_get_rate(struct clk *clk)
120 return clk->rate;
122 EXPORT_SYMBOL(clk_get_rate);
124 /***************************************************************************/