Merge pull request #1044 from freechipsproject/nicer-clint
clint: use RegField.toBytes to save some work
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commit
5ff4c1674a
@ -21,7 +21,7 @@ object ClintConsts
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def timecmpBytes = 8
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def size = 0x10000
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def timeWidth = 64
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def regWidth = 32
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def ipiWidth = 32
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def ints = 2
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}
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@ -57,15 +57,11 @@ class CoreplexLocalInterrupter(params: ClintParams)(implicit p: Parameters) exte
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val rtcTick = Bool(INPUT)
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})
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val time = Seq.fill(timeWidth/regWidth)(Reg(init=UInt(0, width = regWidth)))
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when (io.rtcTick) {
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val newTime = time.asUInt + UInt(1)
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for ((reg, i) <- time zip (0 until timeWidth by regWidth))
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reg := newTime >> i
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}
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val time = RegInit(UInt(0, width = timeWidth))
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when (io.rtcTick) { time := time + UInt(1) }
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val nTiles = intnode.out.size
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val timecmp = Seq.fill(nTiles) { Seq.fill(timeWidth/regWidth)(Reg(UInt(width = regWidth))) }
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val timecmp = Seq.fill(nTiles) { Reg(UInt(width = timeWidth)) }
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val ipi = Seq.fill(nTiles) { RegInit(UInt(0, width = 1)) }
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val (intnode_out, _) = intnode.out.unzip
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@ -84,12 +80,10 @@ class CoreplexLocalInterrupter(params: ClintParams)(implicit p: Parameters) exte
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* bffc mtime hi
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*/
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def makeRegFields(s: Seq[UInt]) = s.map(r => RegField(regWidth, r))
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node.regmap(
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0 -> makeRegFields(ipi),
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timecmpOffset(0) -> makeRegFields(timecmp.flatten),
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timeOffset -> makeRegFields(time))
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0 -> ipi.map(r => RegField(ipiWidth, r)),
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timecmpOffset(0) -> timecmp.flatMap(RegField.bytes(_)),
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timeOffset -> RegField.bytes(time))
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}
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}
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@ -122,6 +122,12 @@ object RegField
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when (valid) { bytes(i) := data }
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Bool(true)
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}))}}
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def bytes(reg: UInt): Seq[RegField] = {
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val width = reg.getWidth
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require (width % 8 == 0, s"RegField.bytes must be called on byte-sized reg, not ${width} bits")
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bytes(reg, width/8)
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}
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}
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trait HasRegMap
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