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OMAP2+: clockdomain: add clkdm_in_hwsup()

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Add a new function, clkdm_in_hwsup(), that returns true if a clockdomain
is configured for hardware-supervised idle.  It does not actually read the
hardware; rather, it checks an internal flag in the struct clockdomain, which
is changed when the clockdomain is switched in and out of hardware-supervised
idle.  This should be safe, since all changes to the idle mode should
pass through the clockdomain code.

Based on a set of patches by Rajendra Nayak <rnayak@ti.com> which do
the same thing by checking the hardware bits.  This approach should be
faster and more compact.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Todd Poynor <toddpoynor@google.com>
Cc: Benoît Cousson <b-cousson@ti.com>
This commit is contained in:
Paul Walmsley 2011-07-10 05:56:54 -06:00
parent 113a74137f
commit 32a363c0f5
2 changed files with 34 additions and 2 deletions
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30
arch/arm/mach-omap2/clockdomain.c
View file

@ -1,8 +1,8 @@
/*
* OMAP2/3/4 clockdomain framework functions
*
* Copyright (C) 2008-2010 Texas Instruments, Inc.
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2008-2011 Texas Instruments, Inc.
* Copyright (C) 2008-2011 Nokia Corporation
*
* Written by Paul Walmsley and Jouni Högander
* Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
@ -704,6 +704,8 @@ int clkdm_sleep(struct clockdomain *clkdm)
pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
return arch_clkdm->clkdm_sleep(clkdm);
}
@ -732,6 +734,8 @@ int clkdm_wakeup(struct clockdomain *clkdm)
pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
return arch_clkdm->clkdm_wakeup(clkdm);
}
@ -762,6 +766,8 @@ void clkdm_allow_idle(struct clockdomain *clkdm)
pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
clkdm->name);
clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED;
arch_clkdm->clkdm_allow_idle(clkdm);
pwrdm_clkdm_state_switch(clkdm);
}
@ -792,9 +798,29 @@ void clkdm_deny_idle(struct clockdomain *clkdm)
pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
clkdm->name);
clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
arch_clkdm->clkdm_deny_idle(clkdm);
}
/**
* clkdm_in_hwsup - is clockdomain @clkdm have hardware-supervised idle enabled?
* @clkdm: struct clockdomain *
*
* Returns true if clockdomain @clkdm currently has
* hardware-supervised idle enabled, or false if it does not or if
* @clkdm is NULL. It is only valid to call this function after
* clkdm_init() has been called. This function does not actually read
* bits from the hardware; it instead tests an in-memory flag that is
* changed whenever the clockdomain code changes the auto-idle mode.
*/
bool clkdm_in_hwsup(struct clockdomain *clkdm)
{
if (!clkdm)
return false;
return (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false;
}
/* Clockdomain-to-clock/hwmod framework interface code */

6
arch/arm/mach-omap2/clockdomain.h
View file

@ -83,6 +83,9 @@ struct clkdm_dep {
const struct omap_chip_id omap_chip;
};
/* Possible flags for struct clockdomain._flags */
#define _CLKDM_FLAG_HWSUP_ENABLED BIT(0)
/**
* struct clockdomain - OMAP clockdomain
* @name: clockdomain name
@ -90,6 +93,7 @@ struct clkdm_dep {
* @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
@ -114,6 +118,7 @@ struct clockdomain {
} pwrdm;
const u16 clktrctrl_mask;
const u8 flags;
u8 _flags;
const u8 dep_bit;
const u8 prcm_partition;
const s16 cm_inst;
@ -178,6 +183,7 @@ int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
void clkdm_allow_idle(struct clockdomain *clkdm);
void clkdm_deny_idle(struct clockdomain *clkdm);
bool clkdm_in_hwsup(struct clockdomain *clkdm);
int clkdm_wakeup(struct clockdomain *clkdm);
int clkdm_sleep(struct clockdomain *clkdm);