1. 根目录:
2. arch
3. blackfin
4. include
5. asm
6. clocks.h

/*
 * Common Clock definitions for various kernel files
 *
 * Copyright 2007-2008 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef _BFIN_CLOCKS_H
#define _BFIN_CLOCKS_H

#include <asm/dpmc.h>

#ifdef CONFIG_CCLK_DIV_1
# define CONFIG_CCLK_ACT_DIV   CCLK_DIV1
# define CONFIG_CCLK_DIV 1
#endif

#ifdef CONFIG_CCLK_DIV_2
# define CONFIG_CCLK_ACT_DIV   CCLK_DIV2
# define CONFIG_CCLK_DIV 2
#endif

#ifdef CONFIG_CCLK_DIV_4
# define CONFIG_CCLK_ACT_DIV   CCLK_DIV4
# define CONFIG_CCLK_DIV 4
#endif

#ifdef CONFIG_CCLK_DIV_8
# define CONFIG_CCLK_ACT_DIV   CCLK_DIV8
# define CONFIG_CCLK_DIV 8
#endif

#ifndef CONFIG_PLL_BYPASS
# ifndef CONFIG_CLKIN_HALF
#  define CONFIG_VCO_HZ   (CONFIG_CLKIN_HZ * CONFIG_VCO_MULT)
# else
#  define CONFIG_VCO_HZ   ((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT)/2)
# endif

# define CONFIG_CCLK_HZ  (CONFIG_VCO_HZ/CONFIG_CCLK_DIV)
# define CONFIG_SCLK_HZ  (CONFIG_VCO_HZ/CONFIG_SCLK_DIV)

#else
# define CONFIG_VCO_HZ   (CONFIG_CLKIN_HZ)
# define CONFIG_CCLK_HZ  (CONFIG_CLKIN_HZ)
# define CONFIG_SCLK_HZ  (CONFIG_CLKIN_HZ)
# define CONFIG_VCO_MULT 0
#endif

#include <linux/clk.h>

struct clk_ops {
	unsigned long (*get_rate)(struct clk *clk);
	unsigned long (*round_rate)(struct clk *clk, unsigned long rate);
	int (*set_rate)(struct clk *clk, unsigned long rate);
	int (*enable)(struct clk *clk);
	int (*disable)(struct clk *clk);
};

struct clk {
	struct clk		*parent;
	const char              *name;
	unsigned long           rate;
	spinlock_t              lock;
	u32                     flags;
	const struct clk_ops    *ops;
	void __iomem            *reg;
	u32                     mask;
	u32                     shift;
};

int clk_init(void);
#endif