Add support for using the new Low-Leakage power gates

If the config just says "True" (or nothing), then the variant
is selected automatically, using the low-leakage one by default
for anything up to width=4 and the standard ones for anything
wider.

Signed-off-by: Sylvain Munaut <[email protected]>

Author: smunaut

py/tt/elements.py

@@ -219,23 +219,23 @@ def __init__(self, layout, mh, width, mod_name):
 
 class VddPowerSwitch(PowerSwitch):
 
-	def __init__(self, layout, mh):
+	def __init__(self, layout, mp):
 		super().__init__(
 			layout,
-			mh,
+			mp.height,
 			layout.glb.pg_vdd.width,
-			f'tt_pg_1v8_{mh:d}'
+			f'tt_pg_1v8_{mp.pg_vdd_variant:s}'
 		)
 
 
 class VaaPowerSwitch(PowerSwitch):
 
-	def __init__(self, layout, mh):
+	def __init__(self, layout, mp):
 		super().__init__(
 			layout,
-			mh,
+			mp.height,
 			layout.glb.pg_vaa.width,
-			f'tt_pg_3v3_{mh:d}'
+			f'tt_pg_3v3_{np.pg_vaa_variant:s}'
 		)
 
 
@@ -413,8 +413,8 @@ def __init__(self, layout, placer, mux_id):
 				mod_name = f'tt_um_{mp.name:s}',
 				mw = mp.width,
 				mh = mp.height,
-				pg_vdd = mp.pg_vdd,
-				pg_vaa = mp.pg_vaa,
+				pg_vdd = mp.pg_vdd_variant is not None,
+				pg_vaa = mp.pg_vaa_variant is not None,
 				analog = mp.analog,
 			)
 
@@ -449,19 +449,19 @@ def __init__(self, layout, placer, mux_id):
 					self.add_child(ana_sw, Point(pos_x, pos_y), orient, name=name_pfx+f'tt_asw_{k:d}_I')
 
 			# Power gating
-			if mp.pg_vdd:
+			if mp.pg_vdd_variant is not None:
 				# Power Switch instance
-				vdd_sw = VddPowerSwitch(layout, mh=mp.height)
+				vdd_sw = VddPowerSwitch(layout, mp)
 
 				# Add Power Switch as child
 				self.add_child(vdd_sw, Point(blk_x, blk_y), 'N' if (blk_id & 1) else 'FS', name=name_pfx+'tt_pg_vdd_I')
 
 				# Shift the block
 				blk_x += layout.glb.pg_vdd.offset
 
-			if mp.pg_vaa:
+			if mp.pg_vaa_variant is not None:
 				# Power Switch instance
-				vaa_sw = VaaPowerSwitch(layout, mh=mp.height)
+				vaa_sw = VaaPowerSwitch(layout, mp)
 
 				# Add Power Switch as child
 				self.add_child(vaa_sw, Point(blk_x, blk_y), 'N' if (blk_id & 1) else 'FS', name=name_pfx+'tt_pg_vaa_I')

py/tt/placer.py

@@ -30,6 +30,9 @@ def __init__(self, placer, cfg_data):
 		self.pg_vaa = cfg_data.get('pg_vaa', False)
 		self.analog = cfg_data.get('analog', {})
 
+		if self.pg_vdd is True:
+			self.pg_vdd = 'std' if self.width > 4 else 'll'
+
 	def as_dict(self):
 		return {
 			'name':   self.name,
@@ -52,6 +55,22 @@ def mux_id(self):
 	def blk_id(self):
 		return self.placer.p2l(self.pos_x, self.pos_y)[1]
 
+	@property
+	def pg_vdd_variant(self):
+		if self.pg_vdd == 'std':
+			return f'{self.height:d}'
+		elif self.pg_vdd == 'll':
+			return f'll_{self.height:d}'
+		else:
+			return None
+
+	@property
+	def pg_vaa_variant(self):
+		if self.pg_vdd is True:
+			return f'{self.height:d}'
+		else:
+			return None
+
 
 class ModulePlacer:
 

rtl/tt_user_module.v.mak

@@ -93,8 +93,8 @@ module tt_user_module #(
 			);
 %   endfor
 %  endif
-%  if mod.pg_vdd:
-			tt_pg_1v8_${mod.height} tt_pg_vdd_I (
+%  if mod.pg_vdd_variant is not None:
+			tt_pg_1v8_${mod.pg_vdd_variant} tt_pg_vdd_I (
 `ifdef USE_POWER_PINS
 				.GPWR    (l_vdpwr),
 				.VPWR    (VDPWR),
@@ -107,8 +107,8 @@ module tt_user_module #(
 			assign l_vdpwr = VDPWR;
 `endif
 %  endif
-%  if mod.pg_vaa:
-			tt_pg_3v3_${mod.height} tt_pg_vaa_I (
+%  if mod.pg_vaa_variant is not None:
+			tt_pg_3v3_${mod.pg_vaa_variant} tt_pg_vaa_I (
 `ifdef USE_POWER_PINS
 				.GPWR    (l_vapwr),
 				.VPWR    (VAPWR),