X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmain%2Fscala%2Fdevices%2Fi2c%2FI2C.scala;h=aecf2dca476cde9bb5bfb94adbb650ed988b0959;hb=4fcf349adb9e66ea7d8cc5394de5d3e0a2340985;hp=363d37b6eec33553f3e1f000cc535e19d90bfc96;hpb=baccd5ada2ab54381d9f4c75a3e3e72f39b2bcef;p=sifive-blocks.git

diff --git a/src/main/scala/devices/i2c/I2C.scala b/src/main/scala/devices/i2c/I2C.scala
index 363d37b..aecf2dc 100644
--- a/src/main/scala/devices/i2c/I2C.scala
+++ b/src/main/scala/devices/i2c/I2C.scala
@@ -42,11 +42,11 @@
 package sifive.blocks.devices.i2c
 
 import Chisel._
-import config._
-import regmapper._
-import uncore.tilelink2._
-import util.{AsyncResetRegVec, Majority}
-import sifive.blocks.devices.gpio.{GPIOPinCtrl}
+import chisel3.experimental.MultiIOModule
+import freechips.rocketchip.config._
+import freechips.rocketchip.regmapper._
+import freechips.rocketchip.tilelink._
+import freechips.rocketchip.util.{AsyncResetRegVec, Majority}
 
 case class I2CParams(address: BigInt)
 
@@ -65,7 +65,7 @@ trait HasI2CBundleContents extends Bundle {
   val port = new I2CPort
 }
 
-trait HasI2CModuleContents extends Module with HasRegMap {
+trait HasI2CModuleContents extends MultiIOModule with HasRegMap {
   val io: HasI2CBundleContents
   val params: I2CParams
 
@@ -517,12 +517,28 @@ trait HasI2CModuleContents extends Module with HasRegMap {
   status.irqFlag            := (cmdAck || arbLost || status.irqFlag) && !cmd.irqAck
 
 
+  val statusReadReady = Reg(init = true.B)
+  when (!statusReadReady) {
+    statusReadReady := true.B
+  }
+
+  // statusReadReady,
   regmap(
     I2CCtrlRegs.prescaler_lo -> Seq(RegField(8, prescaler.lo)),
     I2CCtrlRegs.prescaler_hi -> Seq(RegField(8, prescaler.hi)),
     I2CCtrlRegs.control      -> control.elements.map{ case(name, e) => RegField(e.getWidth, e.asInstanceOf[UInt]) }.toSeq,
     I2CCtrlRegs.data         -> Seq(RegField(8, r = RegReadFn(receivedData),  w = RegWriteFn(transmitData))),
-    I2CCtrlRegs.cmd_status   -> Seq(RegField(8, r = RegReadFn(status.asUInt), w = RegWriteFn(nextCmd)))
+    I2CCtrlRegs.cmd_status   -> Seq(RegField(8, r = RegReadFn{ ready =>
+                                                               (statusReadReady, status.asUInt)
+                                                             },
+                                                w = RegWriteFn((valid, data) => {
+                                                               when (valid) {
+                                                                 statusReadReady := false.B
+                                                                 nextCmd := data
+                                                             }
+                                                             true.B
+                                                }
+                                                )))
   )
 
   // tie off unused bits
@@ -535,6 +551,6 @@ trait HasI2CModuleContents extends Module with HasRegMap {
 
 // Magic TL2 Incantation to create a TL2 Slave
 class TLI2C(w: Int, c: I2CParams)(implicit p: Parameters)
-  extends TLRegisterRouter(c.address, interrupts = 1, beatBytes = w)(
+  extends TLRegisterRouter(c.address, "i2c", Seq("sifive,i2c0"), interrupts = 1, beatBytes = w)(
   new TLRegBundle(c, _)    with HasI2CBundleContents)(
   new TLRegModule(c, _, _) with HasI2CModuleContents)