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

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>

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 207a2ff..21ffd8a 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -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;