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/*
* arch/arm/plat-spear/include/plat/clock.h
*
* Clock framework definitions for SPEAr platform
*
* Copyright (C) 2009 ST Microelectronics
* Viresh Kumar<viresh.kumar@st.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef __PLAT_CLOCK_H
#define __PLAT_CLOCK_H
#include <linux/list.h>
#include <linux/clkdev.h>
#include <linux/types.h>
/* clk structure flags */
#define ALWAYS_ENABLED (1 << 0) /* clock always enabled */
#define RESET_TO_ENABLE (1 << 1) /* reset register bit to enable clk */
/**
* struct clkops - clock operations
* @enable: pointer to clock enable function
* @disable: pointer to clock disable function
*/
struct clkops {
int (*enable) (struct clk *);
void (*disable) (struct clk *);
};
/**
* struct pclk_info - parents info
* @pclk: pointer to parent clk
* @pclk_mask: value to be written for selecting this parent
* @scalable: Is parent scalable (1 - YES, 0 - NO)
*/
struct pclk_info {
struct clk *pclk;
u8 pclk_mask;
u8 scalable;
};
/**
* struct pclk_sel - parents selection configuration
* @pclk_info: pointer to array of parent clock info
* @pclk_count: number of parents
* @pclk_sel_reg: register for selecting a parent
* @pclk_sel_mask: mask for selecting parent (can be used to clear bits also)
*/
struct pclk_sel {
struct pclk_info *pclk_info;
u8 pclk_count;
unsigned int *pclk_sel_reg;
unsigned int pclk_sel_mask;
};
/**
* struct clk - clock structure
* @usage_count: num of users who enabled this clock
* @flags: flags for clock properties
* @rate: programmed clock rate in Hz
* @en_reg: clk enable/disable reg
* @en_reg_bit: clk enable/disable bit
* @ops: clk enable/disable ops - generic_clkops selected if NULL
* @recalc: pointer to clock rate recalculate function
* @pclk: current parent clk
* @pclk_sel: pointer to parent selection structure
* @pclk_sel_shift: register shift for selecting parent of this clock
* @children: list for childrens or this clock
* @sibling: node for list of clocks having same parents
* @private_data: clock specific private data
*/
struct clk {
unsigned int usage_count;
unsigned int flags;
unsigned long rate;
unsigned int *en_reg;
u8 en_reg_bit;
const struct clkops *ops;
void (*recalc) (struct clk *);
struct clk *pclk;
struct pclk_sel *pclk_sel;
unsigned int pclk_sel_shift;
struct list_head children;
struct list_head sibling;
void *private_data;
};
/* pll configuration structure */
struct pll_clk_config {
unsigned int *mode_reg;
unsigned int *cfg_reg;
};
/* ahb and apb bus configuration structure */
struct bus_clk_config {
unsigned int *reg;
unsigned int mask;
unsigned int shift;
};
/*
* Aux clk configuration structure: applicable to GPT, UART and FIRDA
*/
struct aux_clk_config {
unsigned int *synth_reg;
};
/* platform specific clock functions */
void clk_register(struct clk_lookup *cl);
void recalc_root_clocks(void);
/* clock recalc functions */
void follow_parent(struct clk *clk);
void pll1_clk_recalc(struct clk *clk);
void bus_clk_recalc(struct clk *clk);
void gpt_clk_recalc(struct clk *clk);
void aux_clk_recalc(struct clk *clk);
#endif /* __PLAT_CLOCK_H */
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