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/* Copyright (c) 2009, 2012-2014 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __MACH_CLK_H
#define __MACH_CLK_H
#include <linux/notifier.h>
#define CLKFLAG_INVERT 0x00000001
#define CLKFLAG_NOINVERT 0x00000002
#define CLKFLAG_NONEST 0x00000004
#define CLKFLAG_NORESET 0x00000008
#define CLKFLAG_RETAIN_PERIPH 0x00000010
#define CLKFLAG_NORETAIN_PERIPH 0x00000020
#define CLKFLAG_RETAIN_MEM 0x00000040
#define CLKFLAG_NORETAIN_MEM 0x00000080
#define CLKFLAG_SKIP_HANDOFF 0x00000100
#define CLKFLAG_MIN 0x00000400
#define CLKFLAG_MAX 0x00000800
#define CLKFLAG_INIT_DONE 0x00001000
#define CLKFLAG_INIT_ERR 0x00002000
#define CLKFLAG_NO_RATE_CACHE 0x00004000
#define CLKFLAG_MEASURE 0x00008000
#define CLKFLAG_EPROBE_DEFER 0x00010000
struct clk_lookup;
struct clk;
enum clk_reset_action {
CLK_RESET_DEASSERT = 0,
CLK_RESET_ASSERT = 1
};
struct clk_src {
struct clk *src;
int sel;
};
/* Rate is maximum clock rate in Hz */
int clk_set_max_rate(struct clk *clk, unsigned long rate);
/* Assert/Deassert reset to a hardware block associated with a clock */
int clk_reset(struct clk *clk, enum clk_reset_action action);
/* Set clock-specific configuration parameters */
int clk_set_flags(struct clk *clk, unsigned long flags);
/* returns the mux selection index associated with a particular parent */
int parent_to_src_sel(struct clk_src *parents, int num_parents, struct clk *p);
/* returns the mux selection index associated with a particular parent */
int clk_get_parent_sel(struct clk *c, struct clk *parent);
/**
* DOC: clk notifier callback types
*
* PRE_RATE_CHANGE - called immediately before the clk rate is changed,
* to indicate that the rate change will proceed. Drivers must
* immediately terminate any operations that will be affected by the
* rate change. Callbacks may either return NOTIFY_DONE, NOTIFY_OK,
* NOTIFY_STOP or NOTIFY_BAD.
*
* ABORT_RATE_CHANGE: called if the rate change failed for some reason
* after PRE_RATE_CHANGE. In this case, all registered notifiers on
* the clk will be called with ABORT_RATE_CHANGE. Callbacks must
* always return NOTIFY_DONE or NOTIFY_OK.
*
* POST_RATE_CHANGE - called after the clk rate change has successfully
* completed. Callbacks must always return NOTIFY_DONE or NOTIFY_OK.
*
*/
#define PRE_RATE_CHANGE BIT(0)
#define POST_RATE_CHANGE BIT(1)
#define ABORT_RATE_CHANGE BIT(2)
/**
* struct msm_clk_notifier - associate a clk with a notifier
* @clk: struct clk * to associate the notifier with
* @notifier_head: a blocking_notifier_head for this clk
* @node: linked list pointers
*
* A list of struct clk_notifier is maintained by the notifier code.
* An entry is created whenever code registers the first notifier on a
* particular @clk. Future notifiers on that @clk are added to the
* @notifier_head.
*/
struct msm_clk_notifier {
struct clk *clk;
struct srcu_notifier_head notifier_head;
struct list_head node;
};
/**
* struct msm_clk_notifier_data - rate data to pass to the notifier callback
* @clk: struct clk * being changed
* @old_rate: previous rate of this clk
* @new_rate: new rate of this clk
*
* For a pre-notifier, old_rate is the clk's rate before this rate
* change, and new_rate is what the rate will be in the future. For a
* post-notifier, old_rate and new_rate are both set to the clk's
* current rate (this was done to optimize the implementation).
*/
struct msm_clk_notifier_data {
struct clk *clk;
unsigned long old_rate;
unsigned long new_rate;
};
int msm_clk_notif_register(struct clk *clk, struct notifier_block *nb);
int msm_clk_notif_unregister(struct clk *clk, struct notifier_block *nb);
#endif
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