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/
usr/
src/
linux-headers-3.0.0-14/
arch/
arm/
plat-spear/
include/
plat/
- drwxr-xr-x
|
Viewing file:  clock.h (6.1 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/*
* 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 */
#define ENABLED_ON_INIT (1 << 2) /* clocks enabled at init */
/**
* 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_val: value to be written for selecting this parent
*/
struct pclk_info {
struct clk *pclk;
u8 pclk_val;
};
/**
* 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;
void __iomem *pclk_sel_reg;
unsigned int pclk_sel_mask;
};
/**
* struct rate_config - clk rate configurations
* @tbls: array of device specific clk rate tables, in ascending order of rates
* @count: size of tbls array
* @default_index: default setting when originally disabled
*/
struct rate_config {
void *tbls;
u8 count;
u8 default_index;
};
/**
* 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
* @set_rate: pointer to clock set rate function
* @calc_rate: pointer to clock get rate function for index
* @rate_config: rate configuration information, used by set_rate
* @div_factor: division factor to parent clock.
* @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
* @node: list to maintain clocks linearly
* @cl: clocklook up associated with this clock
* @dent: object for debugfs
*/
struct clk {
unsigned int usage_count;
unsigned int flags;
unsigned long rate;
void __iomem *en_reg;
u8 en_reg_bit;
const struct clkops *ops;
int (*recalc) (struct clk *);
int (*set_rate) (struct clk *, unsigned long rate);
unsigned long (*calc_rate)(struct clk *, int index);
struct rate_config rate_config;
unsigned int div_factor;
struct clk *pclk;
struct pclk_sel *pclk_sel;
unsigned int pclk_sel_shift;
struct list_head children;
struct list_head sibling;
void *private_data;
#ifdef CONFIG_DEBUG_FS
struct list_head node;
struct clk_lookup *cl;
struct dentry *dent;
#endif
};
/* pll configuration structure */
struct pll_clk_masks {
u32 mode_mask;
u32 mode_shift;
u32 norm_fdbk_m_mask;
u32 norm_fdbk_m_shift;
u32 dith_fdbk_m_mask;
u32 dith_fdbk_m_shift;
u32 div_p_mask;
u32 div_p_shift;
u32 div_n_mask;
u32 div_n_shift;
};
struct pll_clk_config {
void __iomem *mode_reg;
void __iomem *cfg_reg;
struct pll_clk_masks *masks;
};
/* pll clk rate config structure */
struct pll_rate_tbl {
u8 mode;
u16 m;
u8 n;
u8 p;
};
/* ahb and apb bus configuration structure */
struct bus_clk_masks {
u32 mask;
u32 shift;
};
struct bus_clk_config {
void __iomem *reg;
struct bus_clk_masks *masks;
};
/* ahb and apb clk bus rate config structure */
struct bus_rate_tbl {
u8 div;
};
/* Aux clk configuration structure: applicable to UART and FIRDA */
struct aux_clk_masks {
u32 eq_sel_mask;
u32 eq_sel_shift;
u32 eq1_mask;
u32 eq2_mask;
u32 xscale_sel_mask;
u32 xscale_sel_shift;
u32 yscale_sel_mask;
u32 yscale_sel_shift;
};
struct aux_clk_config {
void __iomem *synth_reg;
struct aux_clk_masks *masks;
};
/* aux clk rate config structure */
struct aux_rate_tbl {
u16 xscale;
u16 yscale;
u8 eq;
};
/* GPT clk configuration structure */
struct gpt_clk_masks {
u32 mscale_sel_mask;
u32 mscale_sel_shift;
u32 nscale_sel_mask;
u32 nscale_sel_shift;
};
struct gpt_clk_config {
void __iomem *synth_reg;
struct gpt_clk_masks *masks;
};
/* gpt clk rate config structure */
struct gpt_rate_tbl {
u16 mscale;
u16 nscale;
};
/* clcd clk configuration structure */
struct clcd_synth_masks {
u32 div_factor_mask;
u32 div_factor_shift;
};
struct clcd_clk_config {
void __iomem *synth_reg;
struct clcd_synth_masks *masks;
};
/* clcd clk rate config structure */
struct clcd_rate_tbl {
u16 div;
};
/* platform specific clock functions */
void __init clk_init(void);
void clk_register(struct clk_lookup *cl);
void recalc_root_clocks(void);
/* clock recalc & set rate functions */
int follow_parent(struct clk *clk);
unsigned long pll_calc_rate(struct clk *clk, int index);
int pll_clk_recalc(struct clk *clk);
int pll_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long bus_calc_rate(struct clk *clk, int index);
int bus_clk_recalc(struct clk *clk);
int bus_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long gpt_calc_rate(struct clk *clk, int index);
int gpt_clk_recalc(struct clk *clk);
int gpt_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long aux_calc_rate(struct clk *clk, int index);
int aux_clk_recalc(struct clk *clk);
int aux_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long clcd_calc_rate(struct clk *clk, int index);
int clcd_clk_recalc(struct clk *clk);
int clcd_clk_set_rate(struct clk *clk, unsigned long desired_rate);
#endif /* __PLAT_CLOCK_H */
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