1 files changed, 124 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 529142aff766..ee9416bcc3e6 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -136,6 +136,7 @@
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
+#include <linux/slab.h>
 
 #include "common.h"
 #include <plat/cpu.h>
@@ -381,6 +382,51 @@ static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
 }
 
 /**
+ * _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 *
  *
@@ -1441,6 +1487,25 @@ static int _enable(struct omap_hwmod *oh)
 
         pr_debug("omap_hwmod: %s: enabling\n", oh->name);
 
+        /*
+         * hwmods with HWMOD_INIT_NO_IDLE flag set are left
+         * in enabled state at init.
+         * Now that someone is really trying to enable them,
+         * just ensure that the hwmod mux is set.
+         */
+        if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
+                /*
+                 * If the caller has mux data populated, do the mux'ing
+                 * which wouldn't have been done as part of the _enable()
+                 * done during setup.
+                 */
+                if (oh->mux)
+                        omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
+
+                oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
+                return 0;
+        }
+
         if (oh->_state != _HWMOD_STATE_INITIALIZED &&
             oh->_state != _HWMOD_STATE_IDLE &&
             oh->_state != _HWMOD_STATE_DISABLED) {
@@ -1744,8 +1809,10 @@ static int _setup(struct omap_hwmod *oh, void *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_IDLE)) {
+                oh->_int_flags |= _HWMOD_SKIP_ENABLE;
                 postsetup_state = _HWMOD_STATE_ENABLED;
+        }
 
         if (postsetup_state == _HWMOD_STATE_IDLE)
                 _idle(oh);
@@ -2416,6 +2483,7 @@ 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 +2514,7 @@ 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;
@@ -2662,3 +2731,57 @@ int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
 
         return 0;
 }
+
+/**
+ * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
+ * @oh: struct omap_hwmod * containing hwmod mux entries
+ * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
+ * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
+ *
+ * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
+ * entry number @pad_idx for the hwmod @oh, trigger the interrupt
+ * service routine for the hwmod's mpu_irqs array index @irq_idx.  If
+ * this function is not called for a given pad_idx, then the ISR
+ * associated with @oh's first MPU IRQ will be triggered when an I/O
+ * pad wakeup occurs on that pad.  Note that @pad_idx is the index of
+ * the _dynamic or wakeup_ entry: if there are other entries not
+ * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
+ * entries are NOT COUNTED in the dynamic pad index.  This function
+ * must be called separately for each pad that requires its interrupt
+ * to be re-routed this way.  Returns -EINVAL if there is an argument
+ * problem or if @oh does not have hwmod mux entries or MPU IRQs;
+ * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
+ *
+ * XXX This function interface is fragile.  Rather than using array
+ * indexes, which are subject to unpredictable change, it should be
+ * using hwmod IRQ names, and some other stable key for the hwmod mux
+ * pad records.
+ */
+int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
+{
+        int nr_irqs;
+
+        might_sleep();
+
+        if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
+            pad_idx >= oh->mux->nr_pads_dynamic)
+                return -EINVAL;
+
+        /* Check the number of available mpu_irqs */
+        for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
+                ;
+
+        if (irq_idx >= nr_irqs)
+                return -EINVAL;
+
+        if (!oh->mux->irqs) {
+                /* XXX What frees this? */
+                oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
+                        GFP_KERNEL);
+                if (!oh->mux->irqs)
+                        return -ENOMEM;
+        }
+        oh->mux->irqs[pad_idx] = irq_idx;
+
+        return 0;
+}