blob: f17f00697cc054df682006d167264a43c959242d [file] [log] [blame]
* OMAP2/3 clockdomain framework functions
* Copyright (C) 2008, 2012 Texas Instruments, Inc.
* Copyright (C) 2008-2011 Nokia Corporation
* 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.
#include <linux/init.h>
#include "powerdomain.h"
#include "clock.h"
#include "omap_hwmod.h"
* Clockdomain flags
* XXX Document CLKDM_CAN_* flags
* CLKDM_NO_AUTODEPS: Prevent "autodeps" from being added/removed from this
* clockdomain. (Currently, this applies to OMAP3 clockdomains only.)
* CLKDM_ACTIVE_WITH_MPU: The PRCM guarantees that this clockdomain is
* active whenever the MPU is active. True for interconnects and
* the WKUP clockdomains.
* CLKDM_MISSING_IDLE_REPORTING: The idle status of the IP blocks and
* clocks inside this clockdomain are not taken into account by
* the PRCM when determining whether the clockdomain is idle.
* Without this flag, if the clockdomain is set to
* hardware-supervised idle mode, the PRCM may transition the
* enclosing powerdomain to a low power state, even when devices
* inside the clockdomain and powerdomain are in use. (An example
* of such a clockdomain is the EMU clockdomain on OMAP3/4.) If
* this flag is set, and the clockdomain does not support the
* force-sleep mode, then the HW_AUTO mode will be used to put the
* clockdomain to sleep. Similarly, if the clockdomain supports
* the force-wakeup mode, then it will be used whenever a clock or
* IP block inside the clockdomain is active, rather than the
* HW_AUTO mode.
#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_NO_AUTODEPS (1 << 4)
#define CLKDM_ACTIVE_WITH_MPU (1 << 5)
* struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
* @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
* 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;
* struct clkdm_dep - encode dependencies between clockdomains
* @clkdm_name: clockdomain name
* @clkdm: pointer to the struct clockdomain of @clkdm_name
* @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;
s16 wkdep_usecount;
s16 sleepdep_usecount;
/* Possible flags for struct clockdomain._flags */
* 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
* @_flags: Flags for use only by internal clockdomain code
* @dep_bit: Bit shift of this clockdomain's PM_WKDEP/CM_SLEEPDEP bit
* @prcm_partition: (OMAP4 only) PRCM partition ID for this clkdm's registers
* @cm_inst: (OMAP4 only) CM instance register offset
* @clkdm_offs: (OMAP4 only) CM clockdomain register offset
* @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
* @usecount: Usecount tracking
* @node: list_head to link all clockdomains together
* @prcm_partition should be a macro from mach-omap2/prcm44xx.h (OMAP4 only)
* @cm_inst should be a macro ending in _INST from the OMAP4 CM instance
* definitions (OMAP4 only)
* @clkdm_offs should be a macro ending in _CDOFFS from the OMAP4 CM instance
* definitions (OMAP4 only)
struct clockdomain {
const char *name;
union {
const char *name;
struct powerdomain *ptr;
} pwrdm;
const u16 clktrctrl_mask;
const u8 flags;
u8 _flags;
const u8 dep_bit;
const u8 prcm_partition;
const u16 cm_inst;
const u16 clkdm_offs;
struct clkdm_dep *wkdep_srcs;
struct clkdm_dep *sleepdep_srcs;
int usecount;
struct list_head node;
* struct clkdm_ops - Arch specific function implementations
* @clkdm_add_wkdep: Add a wakeup dependency between clk domains
* @clkdm_del_wkdep: Delete a wakeup dependency between clk domains
* @clkdm_read_wkdep: Read wakeup dependency state between clk domains
* @clkdm_clear_all_wkdeps: Remove all wakeup dependencies from the clk domain
* @clkdm_add_sleepdep: Add a sleep dependency between clk domains
* @clkdm_del_sleepdep: Delete a sleep dependency between clk domains
* @clkdm_read_sleepdep: Read sleep dependency state between clk domains
* @clkdm_clear_all_sleepdeps: Remove all sleep dependencies from the clk domain
* @clkdm_sleep: Force a clockdomain to sleep
* @clkdm_wakeup: Force a clockdomain to wakeup
* @clkdm_allow_idle: Enable hw supervised idle transitions for clock domain
* @clkdm_deny_idle: Disable hw supervised idle transitions for clock domain
* @clkdm_clk_enable: Put the clkdm in right state for a clock enable
* @clkdm_clk_disable: Put the clkdm in right state for a clock disable
struct clkdm_ops {
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);
int (*clkdm_sleep)(struct clockdomain *clkdm);
int (*clkdm_wakeup)(struct clockdomain *clkdm);
void (*clkdm_allow_idle)(struct clockdomain *clkdm);
void (*clkdm_deny_idle)(struct clockdomain *clkdm);
int (*clkdm_clk_enable)(struct clockdomain *clkdm);
int (*clkdm_clk_disable)(struct clockdomain *clkdm);
int clkdm_register_platform_funcs(struct clkdm_ops *co);
int clkdm_register_autodeps(struct clkdm_autodep *ia);
int clkdm_register_clkdms(struct clockdomain **c);
int clkdm_complete_init(void);
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 clkdm_allow_idle_nolock(struct clockdomain *clkdm);
void clkdm_allow_idle(struct clockdomain *clkdm);
void clkdm_deny_idle_nolock(struct clockdomain *clkdm);
void clkdm_deny_idle(struct clockdomain *clkdm);
bool clkdm_in_hwsup(struct clockdomain *clkdm);
bool clkdm_missing_idle_reporting(struct clockdomain *clkdm);
int clkdm_wakeup_nolock(struct clockdomain *clkdm);
int clkdm_wakeup(struct clockdomain *clkdm);
int clkdm_sleep_nolock(struct clockdomain *clkdm);
int clkdm_sleep(struct clockdomain *clkdm);
int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh);
int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh);
extern void __init omap242x_clockdomains_init(void);
extern void __init omap243x_clockdomains_init(void);
extern void __init omap3xxx_clockdomains_init(void);
extern void __init am33xx_clockdomains_init(void);
extern void __init omap44xx_clockdomains_init(void);
extern void __init omap54xx_clockdomains_init(void);
extern void __init dra7xx_clockdomains_init(void);
void am43xx_clockdomains_init(void);
extern void clkdm_add_autodeps(struct clockdomain *clkdm);
extern void clkdm_del_autodeps(struct clockdomain *clkdm);
extern struct clkdm_ops omap2_clkdm_operations;
extern struct clkdm_ops omap3_clkdm_operations;
extern struct clkdm_ops omap4_clkdm_operations;
extern struct clkdm_ops am33xx_clkdm_operations;
extern struct clkdm_ops am43xx_clkdm_operations;
extern struct clkdm_dep gfx_24xx_wkdeps[];
extern struct clkdm_dep dsp_24xx_wkdeps[];
extern struct clockdomain wkup_common_clkdm;