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| author | Jun Nie <jun.nie@linaro.org> | 2017-07-07 17:21:37 +0800 |
|---|---|---|
| committer | Leif Lindholm <leif.lindholm@linaro.org> | 2017-07-17 17:54:46 +0100 |
| commit | a58bfb37f63a9c16e37c39a48b273ce69194f281 (patch) | |
| tree | 256854bc75b8fe8047874c138828d5a7dd53f821 /EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c | |
| parent | d4102f68dceb36fa8f07af9fa3d24b0da9f173bf (diff) | |
| download | edk2-a58bfb37f63a9c16e37c39a48b273ce69194f281.zip edk2-a58bfb37f63a9c16e37c39a48b273ce69194f281.tar.gz edk2-a58bfb37f63a9c16e37c39a48b273ce69194f281.tar.bz2 | |
EmbeddedPkg/DwEmmc: Adjust FIFO threshold
Adjust FIFO threshold according to FIFO depth. Skip
the adjustment if we do not have FIFO depth info.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Acked-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c')
| -rw-r--r-- | EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c index bb26b69..0437e30 100644 --- a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c +++ b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c @@ -415,6 +415,47 @@ DwEmmcReceiveResponse ( return EFI_SUCCESS;
}
+VOID
+DwEmmcAdjustFifoThreshold (
+ VOID
+ )
+{
+ /* DMA multiple transaction size map to reg value as array index */
+ CONST UINT32 BurstSize[] = {1, 4, 8, 16, 32, 64, 128, 256};
+ UINT32 BlkDepthInFifo, FifoThreshold, FifoWidth, FifoDepth;
+ UINT32 BlkSize = DWEMMC_BLOCK_SIZE, Idx = 0, RxWatermark = 1, TxWatermark, TxWatermarkInvers;
+
+ /* Skip FIFO adjustment if we do not have platform FIFO depth info */
+ FifoDepth = PcdGet32 (PcdDwEmmcDxeFifoDepth);
+ if (!FifoDepth) {
+ return;
+ }
+
+ TxWatermark = FifoDepth / 2;
+ TxWatermarkInvers = FifoDepth - TxWatermark;
+
+ FifoWidth = DWEMMC_GET_HDATA_WIDTH (MmioRead32 (DWEMMC_HCON));
+ if (!FifoWidth) {
+ FifoWidth = 2;
+ } else if (FifoWidth == 2) {
+ FifoWidth = 8;
+ } else {
+ FifoWidth = 4;
+ }
+
+ BlkDepthInFifo = BlkSize / FifoWidth;
+
+ Idx = ARRAY_SIZE (BurstSize) - 1;
+ while (Idx && ((BlkDepthInFifo % BurstSize[Idx]) || (TxWatermarkInvers % BurstSize[Idx]))) {
+ Idx--;
+ }
+
+ RxWatermark = BurstSize[Idx] - 1;
+ FifoThreshold = DWEMMC_DMA_BURST_SIZE (Idx) | DWEMMC_FIFO_TWMARK (TxWatermark)
+ | DWEMMC_FIFO_RWMARK (RxWatermark);
+ MmioWrite32 (DWEMMC_FIFOTH, FifoThreshold);
+}
+
EFI_STATUS
PrepareDmaData (
IN DWEMMC_IDMAC_DESCRIPTOR* IdmacDesc,
@@ -633,6 +674,7 @@ DwEmmcDxeInitialize ( Handle = NULL;
+ DwEmmcAdjustFifoThreshold ();
gpIdmacDesc = (DWEMMC_IDMAC_DESCRIPTOR *)AllocatePages (DWEMMC_MAX_DESC_PAGES);
if (gpIdmacDesc == NULL) {
return EFI_BUFFER_TOO_SMALL;
|