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ARM: OMAP2+: hwmod: Add API to enable IO ring wakeup

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Add API to enable IO pad wakeup capability based on mux pad and
wake_up enable flag available from hwmod_mux initialization.

Use the wakeup_enable flag and enable wakeup capability for the given
pads. Wakeup capability will be enabled/disabled during hwmod idle
transition based on whether wakeup_flag is set or cleared.  If the
hwmod is currently idled, and any mux values were changed by
_set_idle_ioring_wakeup(), the SCM PADCTRL registers will be updated.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
[paul@pwsan.com: rearranged code to limit indentation; cleaned up
 function documentation; removed unused non-static functions; modified
 to search all hwmod pads, not just dynamic remuxing ones; modified to
 update SCM regs if hwmod is currently idle and any pads have changed]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Govindraj R 2011-12-16 14:36:58 -07:00 committed by Paul Walmsley
parent 96dc19fd03
commit eceec00914
1 changed files with 47 additions and 0 deletions
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47
arch/arm/mach-omap2/omap_hwmod.c
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@ -380,6 +380,51 @@ static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
return 0;
}
/**
* _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
* @oh: struct omap_hwmod *
* @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
*
* Set or clear the I/O pad wakeup flag in the mux entries for the
* hwmod @oh. This function changes the @oh->mux->pads_dynamic array
* in memory. If the hwmod is currently idled, and the new idle
* values don't match the previous ones, this function will also
* update the SCM PADCTRL registers. Otherwise, if the hwmod is not
* currently idled, this function won't touch the hardware: the new
* mux settings are written to the SCM PADCTRL registers when the
* hwmod is idled. No return value.
*/
static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
{
struct omap_device_pad *pad;
bool change = false;
u16 prev_idle;
int j;
if (!oh->mux || !oh->mux->enabled)
return;
for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
pad = oh->mux->pads_dynamic[j];
if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
continue;
prev_idle = pad->idle;
if (set_wake)
pad->idle |= OMAP_WAKEUP_EN;
else
pad->idle &= ~OMAP_WAKEUP_EN;
if (prev_idle != pad->idle)
change = true;
}
if (change && oh->_state == _HWMOD_STATE_IDLE)
omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
}
/**
* _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
* @oh: struct omap_hwmod *
@ -2416,6 +2461,7 @@ int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
v = oh->_sysc_cache;
_enable_wakeup(oh, &v);
_write_sysconfig(v, oh);
_set_idle_ioring_wakeup(oh, true);
spin_unlock_irqrestore(&oh->_lock, flags);
return 0;
@ -2446,6 +2492,7 @@ int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
v = oh->_sysc_cache;
_disable_wakeup(oh, &v);
_write_sysconfig(v, oh);
_set_idle_ioring_wakeup(oh, false);
spin_unlock_irqrestore(&oh->_lock, flags);
return 0;