EHCI adding dcahe support, passing enumertaion

src/host/hcd.h

@@ -108,12 +108,18 @@ typedef struct
 // Memory API
 //--------------------------------------------------------------------+
 
-// clean/flush data cache: write cache -> memory
+// clean/flush data cache: write cache -> memory.
+// Required before an DMA TX transfer to make sure data is in memory
 void hcd_dcache_clean(void* addr, uint32_t data_size) TU_ATTR_WEAK;
 
 // invalidate data cache: mark cache as invalid, next read will read from memory
+// Required BOTH before and after an DMA RX transfer
 void hcd_dcache_invalidate(void* addr, uint32_t data_size) TU_ATTR_WEAK;
 
+// clean and invalidate data cache
+// Required before an DMA transfer where memory is both read/write by DMA
+void hcd_dcache_clean_invalidate(void* addr, uint32_t data_size) TU_ATTR_WEAK;
+
 //--------------------------------------------------------------------+
 // Controller API
 //--------------------------------------------------------------------+
@@ -194,6 +200,7 @@ void hcd_event_device_attach(uint8_t rhport, bool in_isr)
   event.event_id            = HCD_EVENT_DEVICE_ATTACH;
   event.connection.hub_addr = 0;
   event.connection.hub_port = 0;
+
   hcd_event_handler(&event, in_isr);
 }
 
@@ -224,7 +231,6 @@ void hcd_event_xfer_complete(uint8_t dev_addr, uint8_t ep_addr, uint32_t xferred
   event.xfer_complete.result = result;
   event.xfer_complete.len = xferred_bytes;
 
-
   hcd_event_handler(&event, in_isr);
 }