implement DMA unit

src/main/scala/TestConfigs.scala

@@ -14,10 +14,12 @@ class WithGroundTest extends Config(
         coherencePolicy = new MESICoherence(site(L2DirectoryRepresentation)),
         nManagers = site(NBanksPerMemoryChannel)*site(NMemoryChannels),
         nCachingClients = site(NTiles),
-        nCachelessClients = site(NTiles) + 1,
+        nCachelessClients = site(NTiles) + (if (site(UseDma)) 2 else 1),
         maxClientXacts = max(site(NMSHRs) + site(NIOMSHRs),
-                             site(GroundTestMaxXacts)),
-        maxClientsPerPort = 1,
+                             max(site(GroundTestMaxXacts),
+                                 if (site(UseDma)) 4 else 1)),
+        maxClientsPerPort = max(if (site(BuildRoCC).isEmpty) 1 else 2,
+                                if (site(UseDma)) site(NDmaTransactors) else 1),
         maxManagerXacts = site(NAcquireTransactors) + 2,
         dataBits = site(CacheBlockBytes)*8)
     case BuildTiles => {
@@ -69,6 +71,22 @@ class WithCacheRegressionTest extends Config(
     case GroundTestMaxXacts => 3
   })
 
+class WithDmaTest extends Config(
+  (pname, site, here) => pname match {
+    case UseDma => true
+    case BuildGroundTest =>
+      (id: Int, p: Parameters) => Module(new DmaTest()(p))
+    case DmaTestSet => DmaTestCases(
+      (0x00001FF0, 0x00002FF4, 72),
+      (0x00001FF4, 0x00002FF0, 72),
+      (0x00001FF0, 0x00002FE0, 72),
+      (0x00001FE0, 0x00002FF0, 72),
+      (0x00884DA4, 0x008836C0, 40),
+      (0x00800008, 0x00800008, 64))
+    case DmaTestDataStart => 0x3012CC00
+    case DmaTestDataStride => 8
+  })
+
 class GroundTestConfig extends Config(new WithGroundTest ++ new DefaultConfig)
 class MemtestConfig extends Config(new WithMemtest ++ new GroundTestConfig)
 class MemtestL2Config extends Config(
@@ -79,6 +97,7 @@ class BroadcastRegressionTestConfig extends Config(
   new WithBroadcastRegressionTest ++ new GroundTestConfig)
 class CacheRegressionTestConfig extends Config(
   new WithCacheRegressionTest ++ new WithL2Cache ++ new GroundTestConfig)
+class DmaTestConfig extends Config(new WithDmaTest ++ new WithL2Cache ++ new GroundTestConfig)
 
 class FancyMemtestConfig extends Config(
   new With2Cores ++ new With2MemoryChannels ++ new With2BanksPerMemChannel ++