On Friday 30 September 2011 04:31 PM, Govindraj.R wrote:
Add API to enable IO pad wakeup capability based on mux dynamic 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.
Call the omap_hwmod_set_ioring_wakeup from hwmod_wakeup_enable/disable.
Signed-off-by: Govindraj.R<govindraj.raja@xxxxxx>
---
arch/arm/mach-omap2/omap_hwmod.c | 59 ++++++++++++++++++++++++++++++++++++++
1 files changed, 59 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 84cc0bd..e751dd9 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -2062,6 +2062,34 @@ static int __init omap_hwmod_setup_all(void)
core_initcall(omap_hwmod_setup_all);
/**
+ * omap_hwmod_set_ioring_wakeup - enable io pad wakeup flag.
+ * @oh: struct omap_hwmod *
+ * @set: bool value indicating to set or clear wakeup status.
+ *
+ * Set or Clear wakeup flag for the io_pad.
+ */
+static int omap_hwmod_set_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
+{
+ struct omap_device_pad *pad;
+ int ret = -EINVAL, j;
+
+ if (oh->mux&& oh->mux->enabled) {
+ for (j = 0; j< oh->mux->nr_pads_dynamic; j++) {
+ pad = oh->mux->pads_dynamic[j];
+ if (pad->flags& OMAP_DEVICE_PAD_WAKEUP) {
+ if (set_wake)
+ pad->idle |= OMAP_WAKEUP_EN;
+ else
+ pad->idle&= ~OMAP_WAKEUP_EN;
I think apart from enabling/disabling the IO wakeup's at the pad
level, there is also a need to trigger the IO daisy chain control
(Wu clock) by programming the PRCM.PM_WKEN_WKUP[16] EN_IO_CHAIN
bit and waiting on the PRCM.PM_WKST_WKUP[16] ST_IO_CHAIN) bit,
which is done by the omap3_enable/disable_io_chain function.
This is still done in the cpuidle path, but it makes sense to
move that over here, since it should be done every time a pad
level wakeup is enabled or disabled.
See section 3.5.7.2.2 I/O Wake-Up Mechanism of 36xx TRM revA.
"The I/O wake-up scheme is enabled by triggering the I/O daisy chain
control (Wu clock) by
programming a dedicated register (PRCM.PM_WKEN_WKUP[16] EN_IO_CHAIN) in
the PRCM module.Software must wait for the I/O daisy chain to complete
before it transitions the PER domain to a
nonfunctional state. This is done by polling a dedicated status bit in
the PRCM module
(PRCM.PM_WKST_WKUP[16] ST_IO_CHAIN). This status bit must be cleared by
software when the bit is
read to 1."
+ ret = 0;
+ }
+ }
+ }
+
+ return ret;
+}
+
+/**
* omap_hwmod_enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
*
@@ -2393,6 +2421,35 @@ int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
{
return _del_initiator_dep(oh, init_oh);
}
+/**
+ * omap_hwmod_enable_ioring_wakeup - Set wakeup flag for iopad.
+ * @oh: struct omap_hwmod *
+ *
+ * Traverse through dynamic pads, if pad is enabled then
+ * set wakeup enable bit flag for the mux pin. Wakeup pad bit
+ * will be set during hwmod idle transistion.
+ * Return error if pads are not enabled or not available.
+ */
+int omap_hwmod_enable_ioring_wakeup(struct omap_hwmod *oh)
+{
+ /* Enable pad wake-up capability */
+ return omap_hwmod_set_ioring_wakeup(oh, true);
+}
+
+/**
+ * omap_hwmod_disable_ioring_wakeup - Clear wakeup flag for iopad.
+ * @oh: struct omap_hwmod *
+ *
+ * Traverse through dynamic pads, if pad is enabled then
+ * clear wakeup enable bit flag for the mux pin. Wakeup pad bit
+ * will be set during hwmod idle transistion.
+ * Return error if pads are not enabled or not available.
+ */
+int omap_hwmod_disable_ioring_wakeup(struct omap_hwmod *oh)
+{
+ /* Disable pad wakeup capability */
+ return omap_hwmod_set_ioring_wakeup(oh, false);
+}
/**
* omap_hwmod_enable_wakeup - allow device to wake up the system
@@ -2419,6 +2476,7 @@ int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
v = oh->_sysc_cache;
_enable_wakeup(oh,&v);
_write_sysconfig(v, oh);
+ omap_hwmod_enable_ioring_wakeup(oh);
spin_unlock_irqrestore(&oh->_lock, flags);
return 0;
@@ -2449,6 +2507,7 @@ int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
v = oh->_sysc_cache;
_disable_wakeup(oh,&v);
_write_sysconfig(v, oh);
+ omap_hwmod_disable_ioring_wakeup(oh);
spin_unlock_irqrestore(&oh->_lock, flags);
return 0;
--
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