uart: use PeripheryBusParams.frequency to calculate default divisor (#28)

[sifive-blocks.git] / src / main / scala / devices / uart / UARTPeriphery.scala

diff --git a/src/main/scala/devices/uart/UARTPeriphery.scala b/src/main/scala/devices/uart/UARTPeriphery.scala
index ef544bfe22fbc1f0f6d42f8f884711bd0328307b..677394f2581ca436bbf565af0d4f568cff208c23 100644 (file)
--- a/src/main/scala/devices/uart/UARTPeriphery.scala
+++ b/src/main/scala/devices/uart/UARTPeriphery.scala
@@ -2,39 +2,44 @@
 package sifive.blocks.devices.uart
 
 import Chisel._
-import config.Field
-import diplomacy.LazyModule
-import rocketchip.{
-  HasTopLevelNetworks,
-  HasTopLevelNetworksBundle,
-  HasTopLevelNetworksModule
-}
-import uncore.tilelink2._
-
+import freechips.rocketchip.config.Field
+import freechips.rocketchip.coreplex.{HasPeripheryBus, PeripheryBusParams, HasInterruptBus}
+import freechips.rocketchip.diplomacy.{LazyModule, LazyMultiIOModuleImp}
 import sifive.blocks.devices.gpio.{GPIOPin, GPIOOutputPinCtrl, GPIOInputPinCtrl}
 import sifive.blocks.util.ShiftRegisterInit
 
 case object PeripheryUARTKey extends Field[Seq[UARTParams]]
 
-trait HasPeripheryUART extends HasTopLevelNetworks {
-  val uartParams = p(PeripheryUARTKey)  
+trait HasPeripheryUART extends HasPeripheryBus with HasInterruptBus {
+  val uartParams = p(PeripheryUARTKey)
+  val divinit = (p(PeripheryBusParams).frequency / 115200).toInt
   val uarts = uartParams map { params =>
-    val uart = LazyModule(new TLUART(peripheryBusBytes, params))
-    uart.node := TLFragmenter(peripheryBusBytes, cacheBlockBytes)(peripheryBus.node)
-    intBus.intnode := uart.intnode
+    val uart = LazyModule(new TLUART(pbus.beatBytes, params.copy(divisorInit = divinit)))
+    uart.node := pbus.toVariableWidthSlaves
+    ibus.fromSync := uart.intnode
     uart
   }
 }
 
-trait HasPeripheryUARTBundle extends HasTopLevelNetworksBundle {
-  val outer: HasPeripheryUART
-  val uarts = Vec(outer.uartParams.size, new UARTPortIO)
+trait HasPeripheryUARTBundle {
+  val uarts: Vec[UARTPortIO]
+
+  def tieoffUARTs(dummy: Int = 1) {
+    uarts.foreach { _.rxd := UInt(1) }
+  }
+
+  def UARTtoGPIOPins(syncStages: Int = 0): Seq[UARTPinsIO] = uarts.map { u =>
+    val pins = Module(new UARTGPIOPort(syncStages))
+    pins.io.uart <> u
+    pins.io.pins
+  }
 }
 
-trait HasPeripheryUARTModule extends HasTopLevelNetworksModule {
+trait HasPeripheryUARTModuleImp extends LazyMultiIOModuleImp with HasPeripheryUARTBundle {
   val outer: HasPeripheryUART
-  val io: HasPeripheryUARTBundle
-  (io.uarts zip outer.uarts).foreach { case (io, device) =>
+  val uarts = IO(Vec(outer.uartParams.size, new UARTPortIO))
+
+  (uarts zip outer.uarts).foreach { case (io, device) =>
     io <> device.module.io.port
   }
 }