From c161215341df8ef6032d5dee8ea64fdceb883bd5 Mon Sep 17 00:00:00 2001
From: whitequark <cz@m-labs.hk>
Date: Mon, 23 Sep 2019 11:16:29 +0000
Subject: [PATCH] hdl.mem: simplify. NFC.

---
 nmigen/hdl/mem.py           | 50 +++++++++++++++++++------------------
 nmigen/test/test_hdl_mem.py | 10 ++++----
 2 files changed, 31 insertions(+), 29 deletions(-)

diff --git a/nmigen/hdl/mem.py b/nmigen/hdl/mem.py
index dfeee87..8335cc0 100644
--- a/nmigen/hdl/mem.py
+++ b/nmigen/hdl/mem.py
@@ -53,24 +53,11 @@ class Memory:
             raise TypeError("Memory initialization value at address {:x}: {}"
                             .format(addr, e)) from None
 
-    def read_port(self, domain="sync", *, transparent=True):
-        if domain == "comb" and not transparent:
-            raise ValueError("Read port cannot be simultaneously asynchronous and non-transparent")
-        return ReadPort(self, domain, transparent=transparent)
+    def read_port(self, **kwargs):
+        return ReadPort(self, **kwargs)
 
-    def write_port(self, domain="sync", *, priority=0, granularity=None):
-        if granularity is None:
-            granularity = self.width
-        if not isinstance(granularity, int) or granularity < 0:
-            raise TypeError("Write port granularity must be a non-negative integer, not '{!r}'"
-                            .format(granularity))
-        if granularity > self.width:
-            raise ValueError("Write port granularity must not be greater than memory width "
-                             "({} > {})"
-                             .format(granularity, self.width))
-        if self.width // granularity * granularity != self.width:
-            raise ValueError("Write port granularity must divide memory width evenly")
-        return WritePort(self, domain, priority=priority, granularity=granularity)
+    def write_port(self, **kwargs):
+        return WritePort(self, **kwargs)
 
     def __getitem__(self, index):
         """Simulation only."""
@@ -78,7 +65,10 @@ class Memory:
 
 
 class ReadPort(Elaboratable):
-    def __init__(self, memory, domain, *, transparent):
+    def __init__(self, memory, *, domain="sync", transparent=True):
+        if domain == "comb" and not transparent:
+            raise ValueError("Read port cannot be simultaneously asynchronous and non-transparent")
+
         self.memory      = memory
         self.domain      = domain
         self.transparent = transparent
@@ -142,7 +132,19 @@ class ReadPort(Elaboratable):
 
 
 class WritePort(Elaboratable):
-    def __init__(self, memory, domain, *, priority, granularity):
+    def __init__(self, memory, *, domain="sync", priority=0, granularity=None):
+        if granularity is None:
+            granularity = memory.width
+        if not isinstance(granularity, int) or granularity < 0:
+            raise TypeError("Write port granularity must be a non-negative integer, not '{!r}'"
+                            .format(granularity))
+        if granularity > memory.width:
+            raise ValueError("Write port granularity must not be greater than memory width "
+                             "({} > {})"
+                             .format(granularity, memory.width))
+        if memory.width // granularity * granularity != memory.width:
+            raise ValueError("Write port granularity must divide memory width evenly")
+
         self.memory       = memory
         self.domain       = domain
         self.priority     = priority
@@ -189,17 +191,17 @@ class DummyPort:
     It does not include any read/write port specific attributes, i.e. none besides ``"domain"``;
     any such attributes may be set manually.
     """
-    def __init__(self, width, addr_bits, domain="sync", *, name=None, granularity=None):
+    def __init__(self, *, data_width, addr_width, domain="sync", name=None, granularity=None):
         self.domain = domain
 
         if granularity is None:
-            granularity = width
+            granularity = data_width
         if name is None:
             name = tracer.get_var_name(depth=2, default="dummy")
 
-        self.addr = Signal(addr_bits,
+        self.addr = Signal(addr_width,
                            name="{}_addr".format(name), src_loc_at=1)
-        self.data = Signal(width,
+        self.data = Signal(data_width,
                            name="{}_data".format(name), src_loc_at=1)
-        self.en   = Signal(width // granularity,
+        self.en   = Signal(data_width // granularity,
                            name="{}_en".format(name), src_loc_at=1)
diff --git a/nmigen/test/test_hdl_mem.py b/nmigen/test/test_hdl_mem.py
index 332dd5e..2e1ade5 100644
--- a/nmigen/test/test_hdl_mem.py
+++ b/nmigen/test/test_hdl_mem.py
@@ -115,17 +115,17 @@ class MemoryTestCase(FHDLTestCase):
 
 class DummyPortTestCase(FHDLTestCase):
     def test_name(self):
-        p1 = DummyPort(width=8, addr_bits=2)
+        p1 = DummyPort(data_width=8, addr_width=2)
         self.assertEqual(p1.addr.name, "p1_addr")
-        p2 = [DummyPort(width=8, addr_bits=2)][0]
+        p2 = [DummyPort(data_width=8, addr_width=2)][0]
         self.assertEqual(p2.addr.name, "dummy_addr")
-        p3 = DummyPort(width=8, addr_bits=2, name="foo")
+        p3 = DummyPort(data_width=8, addr_width=2, name="foo")
         self.assertEqual(p3.addr.name, "foo_addr")
 
     def test_sizes(self):
-        p1 = DummyPort(width=8, addr_bits=2)
+        p1 = DummyPort(data_width=8, addr_width=2)
         self.assertEqual(p1.addr.width, 2)
         self.assertEqual(p1.data.width, 8)
         self.assertEqual(p1.en.width, 1)
-        p2 = DummyPort(width=8, addr_bits=2, granularity=2)
+        p2 = DummyPort(data_width=8, addr_width=2, granularity=2)
         self.assertEqual(p2.en.width, 4)
-- 
2.30.2