linux/arch/arm/plat-omap/include/plat/clockdomain.h

/*
 * arch/arm/plat-omap/include/mach/clockdomain.h
 *
 * OMAP2/3 clockdomain framework functions
 *
 * Copyright (C) 2008 Texas Instruments, Inc.
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Paul Walmsley
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
#define __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H

#include <plat/powerdomain.h>
#include <plat/clock.h>
#include <plat/cpu.h>

/* Clockdomain capability flags */
#define CLKDM_CAN_FORCE_SLEEP			(1 << 0)
#define CLKDM_CAN_FORCE_WAKEUP			(1 << 1)
#define CLKDM_CAN_ENABLE_AUTO			(1 << 2)
#define CLKDM_CAN_DISABLE_AUTO			(1 << 3)

#define CLKDM_CAN_HWSUP		(CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
#define CLKDM_CAN_SWSUP		(CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
#define CLKDM_CAN_HWSUP_SWSUP	(CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)

/* OMAP24XX CM_CLKSTCTRL_*.AUTOSTATE_* register bit values */
#define OMAP24XX_CLKSTCTRL_DISABLE_AUTO		0x0
#define OMAP24XX_CLKSTCTRL_ENABLE_AUTO		0x1

/* OMAP3XXX CM_CLKSTCTRL_*.CLKTRCTRL_* register bit values */
#define OMAP34XX_CLKSTCTRL_DISABLE_AUTO		0x0
#define OMAP34XX_CLKSTCTRL_FORCE_SLEEP		0x1
#define OMAP34XX_CLKSTCTRL_FORCE_WAKEUP		0x2
#define OMAP34XX_CLKSTCTRL_ENABLE_AUTO		0x3

/**
 * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
 * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
 * @omap_chip: OMAP chip types that this autodep is valid on
 *
 * A clockdomain that should have wkdeps and sleepdeps added when a
 * clockdomain should stay active in hwsup mode; and conversely,
 * removed when the clockdomain should be allowed to go inactive in
 * hwsup mode.
 *
 * Autodeps are deprecated and should be removed after
 * omap_hwmod-based fine-grained module idle control is added.
 */
struct clkdm_autodep {
	union {
		const char *name;
		struct clockdomain *ptr;
	} clkdm;
	const struct omap_chip_id omap_chip;
};

/**
 * struct clkdm_dep - encode dependencies between clockdomains
 * @clkdm_name: clockdomain name
 * @clkdm: pointer to the struct clockdomain of @clkdm_name
 * @omap_chip: OMAP chip types that this dependency is valid on
 * @wkdep_usecount: Number of wakeup dependencies causing this clkdm to wake
 * @sleepdep_usecount: Number of sleep deps that could prevent clkdm from idle
 *
 * Statically defined.  @clkdm is resolved from @clkdm_name at runtime and
 * should not be pre-initialized.
 *
 * XXX Should also include hardware (fixed) dependencies.
 */
struct clkdm_dep {
	const char *clkdm_name;
	struct clockdomain *clkdm;
	atomic_t wkdep_usecount;
	atomic_t sleepdep_usecount;
	const struct omap_chip_id omap_chip;
};

/**
 * struct clockdomain - OMAP clockdomain
 * @name: clockdomain name
 * @pwrdm: powerdomain containing this clockdomain
 * @clktrctrl_reg: CLKSTCTRL reg for the given clock domain
 * @clktrctrl_mask: CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg
 * @flags: Clockdomain capability flags
 * @dep_bit: Bit shift of this clockdomain's PM_WKDEP/CM_SLEEPDEP bit
 * @wkdep_srcs: Clockdomains that can be told to wake this powerdomain up
 * @sleepdep_srcs: Clockdomains that can be told to keep this clkdm from inact
 * @omap_chip: OMAP chip types that this clockdomain is valid on
 * @usecount: Usecount tracking
 * @node: list_head to link all clockdomains together
 */
struct clockdomain {
	const char *name;
	union {
		const char *name;
		struct powerdomain *ptr;
	} pwrdm;
	void __iomem *clkstctrl_reg;
	const u16 clktrctrl_mask;
	const u8 flags;
	const u8 dep_bit;
	struct clkdm_dep *wkdep_srcs;
	struct clkdm_dep *sleepdep_srcs;
	const struct omap_chip_id omap_chip;
	atomic_t usecount;
	struct list_head node;
};

void clkdm_init(struct clockdomain **clkdms, struct clkdm_autodep *autodeps);
struct clockdomain *clkdm_lookup(const char *name);

int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
			void *user);
struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);

int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
int clkdm_clear_all_wkdeps(struct clockdomain *clkdm);
int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);

void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
void omap2_clkdm_deny_idle(struct clockdomain *clkdm);

int omap2_clkdm_wakeup(struct clockdomain *clkdm);
int omap2_clkdm_sleep(struct clockdomain *clkdm);

int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);

#endif