sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

EmbeddedPkg/DwEmmc: Adjust FIFO threshold

Browse Source 
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>
This commit is contained in:
Jun Nie
2017-07-07 17:21:37 +08:00
committed by Leif Lindholm
parent d4102f68dc
commit a58bfb37f6
4 changed files with 50 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
View File

@@ -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;