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OMAP2+: hwmod: add postsetup state

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Allow board files and OMAP core code to control the state that some or
all of the hwmods end up in at the end of _setup() (called by
omap_hwmod_late_init() ).  Reimplement the old skip_setup_idle code in
terms of this new postsetup state code.

There are two use-cases for this patch: the !CONFIG_PM_RUNTIME case,
in which all IP blocks should stay enabled after _setup() finishes;
and the MPU watchdog case, in which the watchdog IP block should enter
idle if watchdog coverage of kernel initialization is desired, and
should be disabled otherwise.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Charulatha Varadarajan <charu@ti.com>
This commit is contained in:
Paul Walmsley
2010-12-14 12:42:35 -07:00
parent e4dc8f507c
commit 2092e5ccf8
3 changed files with 88 additions and 32 deletions
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82
arch/arm/mach-omap2/omap_hwmod.c
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@@ -1313,23 +1313,15 @@ static int _shutdown(struct omap_hwmod *oh)
/**
* _setup - do initial configuration of omap_hwmod
* @oh: struct omap_hwmod *
* @skip_setup_idle_p: do not idle hwmods at the end of the fn if 1
*
* Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
* OCP_SYSCONFIG register. @skip_setup_idle is intended to be used on
* a system that will not call omap_hwmod_enable() to enable devices
* (e.g., a system without PM runtime). Returns -EINVAL if the hwmod
* is in the wrong state or returns 0.
* OCP_SYSCONFIG register. Returns -EINVAL if the hwmod is in the
* wrong state or returns 0.
*/
static int _setup(struct omap_hwmod *oh, void *data)
{
int i, r;
u8 skip_setup_idle;
if (!oh || !data)
return -EINVAL;
skip_setup_idle = *(u8 *)data;
u8 postsetup_state;
/* Set iclk autoidle mode */
if (oh->slaves_cnt > 0) {
@@ -1349,7 +1341,6 @@ static int _setup(struct omap_hwmod *oh, void *data)
}
}
mutex_init(&oh->_mutex);
oh->_state = _HWMOD_STATE_INITIALIZED;
/*
@@ -1383,8 +1374,25 @@ static int _setup(struct omap_hwmod *oh, void *data)
}
}
if (!(oh->flags & HWMOD_INIT_NO_IDLE) && !skip_setup_idle)
postsetup_state = oh->_postsetup_state;
if (postsetup_state == _HWMOD_STATE_UNKNOWN)
postsetup_state = _HWMOD_STATE_ENABLED;
/*
* XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
* it should be set by the core code as a runtime flag during startup
*/
if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
(postsetup_state == _HWMOD_STATE_IDLE))
postsetup_state = _HWMOD_STATE_ENABLED;
if (postsetup_state == _HWMOD_STATE_IDLE)
_omap_hwmod_idle(oh);
else if (postsetup_state == _HWMOD_STATE_DISABLED)
_shutdown(oh);
else if (postsetup_state != _HWMOD_STATE_ENABLED)
WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
oh->name, postsetup_state);
return 0;
}
@@ -1485,6 +1493,8 @@ int omap_hwmod_register(struct omap_hwmod *oh)
list_add_tail(&oh->node, &omap_hwmod_list);
mutex_init(&oh->_mutex);
oh->_state = _HWMOD_STATE_REGISTERED;
ret = 0;
@@ -1585,13 +1595,12 @@ int omap_hwmod_init(struct omap_hwmod **ohs)
/**
* omap_hwmod_late_init - do some post-clock framework initialization
* @skip_setup_idle: if 1, do not idle hwmods in _setup()
*
* Must be called after omap2_clk_init(). Resolves the struct clk names
* to struct clk pointers for each registered omap_hwmod. Also calls
* _setup() on each hwmod. Returns 0.
*/
int omap_hwmod_late_init(u8 skip_setup_idle)
int omap_hwmod_late_init(void)
{
int r;
@@ -1603,10 +1612,7 @@ int omap_hwmod_late_init(u8 skip_setup_idle)
WARN(!mpu_oh, "omap_hwmod: could not find MPU initiator hwmod %s\n",
MPU_INITIATOR_NAME);
if (skip_setup_idle)
pr_debug("omap_hwmod: will leave hwmods enabled during setup\n");
omap_hwmod_for_each(_setup, &skip_setup_idle);
omap_hwmod_for_each(_setup, NULL);
return 0;
}
@@ -2132,3 +2138,41 @@ int omap_hwmod_for_each_by_class(const char *classname,
return ret;
}
/**
* omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
* @oh: struct omap_hwmod *
* @state: state that _setup() should leave the hwmod in
*
* Sets the hwmod state that @oh will enter at the end of _setup() (called by
* omap_hwmod_late_init()). Only valid to call between calls to
* omap_hwmod_init() and omap_hwmod_late_init(). Returns 0 upon success or
* -EINVAL if there is a problem with the arguments or if the hwmod is
* in the wrong state.
*/
int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
{
int ret;
if (!oh)
return -EINVAL;
if (state != _HWMOD_STATE_DISABLED &&
state != _HWMOD_STATE_ENABLED &&
state != _HWMOD_STATE_IDLE)
return -EINVAL;
mutex_lock(&oh->_mutex);
if (oh->_state != _HWMOD_STATE_REGISTERED) {
ret = -EINVAL;
goto ohsps_unlock;
}
oh->_postsetup_state = state;
ret = 0;
ohsps_unlock:
mutex_unlock(&oh->_mutex);
return ret;
}