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/*
* Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#ifndef __ASM_ARCH_MXC_CLOCK_H__
#define __ASM_ARCH_MXC_CLOCK_H__
/*!
* @defgroup CLOCKS Clock Control API
*/
/*!
* @file arch-mxc/clock.h
*
* @brief API for setting up and retrieving clocks.
*
* This file contains API for setting up and retrieving clocks.
*
* @ingroup CLOCKS
*/
#ifndef __ASSEMBLY__
#include <linux/list.h>
struct module;
/*!
* MXC specific struct for defining and controlling a single clock.
*
* This structure should not be accessed directly. Use clk_xxx API all
* clock accesses.
*/
struct clk {
struct list_head node;
struct module *owner;
const char *name;
int id;
/*! Source clock this clk depends on */
struct clk *parent;
/*! Secondary clock to enable/disable with this clock */
struct clk *secondary;
/*! Current clock rate */
unsigned long rate;
/*! Reference count of clock enable/disable */
s8 usecount;
/*! Register bit position for clock's enable/disable control. */
u8 enable_shift;
/*! Register address for clock's enable/disable control. */
u32 enable_reg;
u32 flags;
/*! Function ptr to recalculate the clock's rate based on parent
clock's rate */
void (*recalc) (struct clk *);
/*! Function ptr to set the clock to a new rate. The rate must match a
supported rate returned from round_rate. Leave blank if clock is not
programmable */
int (*set_rate) (struct clk *, unsigned long);
/*! Function ptr to round the requested clock rate to the nearest
supported rate that is less than or equal to the requested rate. */
unsigned long (*round_rate) (struct clk *, unsigned long);
/*! Function ptr to enable the clock. Leave blank if clock can not
be gated. */
int (*enable) (struct clk *);
/*! Function ptr to disable the clock. Leave blank if clock can not
be gated. */
void (*disable) (struct clk *);
/*! Function ptr to set the parent clock of the clock. */
int (*set_parent) (struct clk *, struct clk *);
};
int clk_register(struct clk *clk);
void clk_unregister(struct clk *clk);
int clk_get_usecount(struct clk *clk);
int clk_set_pll_dither(struct clk *clk, unsigned int pll_ppm);
/* Clock flags */
#define RATE_PROPAGATES (1 << 0) /* Program children too */
#define ALWAYS_ENABLED (1 << 1) /* Clock cannot be disabled */
#define RATE_FIXED (1 << 2) /* Fixed clock rate */
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARCH_MXC_CLOCK_H__ */
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