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Program SD Cards into 4-bit mode (support for this is required in the spec). This gives a 20+% performance increase in load time of an 8MB image. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10455 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
andrewfish 2010-05-04 16:34:38 +00:00
parent f6381f4c3d
commit 2b649f7477
3 changed files with 24 additions and 3 deletions
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3
Omap35xxPkg/Include/Omap3530/Omap3530Dma.h
View File

@ -97,7 +97,6 @@
#define DMA4_CCR_CONST_FILL_ENABLE BIT16
#define DMA4_CCR_TRANSPARENT_COPY_ENABLE BIT17
#endif

3
Omap35xxPkg/Include/Omap3530/Omap3530MMCHS.h
View File

@ -205,4 +205,7 @@
#define ACMD41 (INDX(41) | RSP_TYPE_48BITS)
#define ACMD41_INT_EN (CERR_EN | CIE_EN | CCRC_EN | CC_EN | CEB_EN | CTO_EN)
#define ACMD6 (INDX(6) | RSP_TYPE_48BITS)
#define ACMD6_INT_EN (CERR_EN | CIE_EN | CCRC_EN | CC_EN | CEB_EN | CTO_EN)
#endif //__OMAP3530SDIO_H__

21
Omap35xxPkg/MMCHSDxe/MMCHS.c
View File

@ -616,6 +616,23 @@ PerformCardConfiguration (
return Status;
}
if ((gCardInfo.CardType != UNKNOWN_CARD) && (gCardInfo.CardType != MMC_CARD)) {
// We could read SCR register, but SD Card Phys spec stats any SD Card shall
// set SCR.SD_BUS_WIDTHS to support 4-bit mode, so why bother?
// Send ACMD6 (application specific commands must be prefixed with CMD55)
Status = SendCmd (CMD55, CMD55_INT_EN, CmdArgument);
if (!EFI_ERROR (Status)) {
// set device into 4-bit data bus mode
Status = SendCmd (ACMD6, ACMD6_INT_EN, 0x2);
if (!EFI_ERROR (Status)) {
// Set host controler into 4-bit mode
MmioOr32 (MMCHS_HCTL, DTW_4_BIT);
DEBUG ((EFI_D_INFO, "SD Memory Card set to 4-bit mode\n"));
}
}
}
//Send CMD16 to set the block length
CmdArgument = gCardInfo.BlockSize;
Status = SendCmd (CMD16, CMD16_INT_EN, CmdArgument);
@ -876,6 +893,8 @@ DetectCard (
gMMCHSMedia.MediaId++;
gMediaChange = FALSE;
DEBUG ((EFI_D_INFO, "SD Card Media Change\n"));
return Status;
}
@ -1190,7 +1209,7 @@ MMCHSInitialize (
Status = gBS->CreateEvent (EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK, TimerCallback, NULL, &gTimerEvent);
ASSERT_EFI_ERROR (Status);
Status = gBS->SetTimer (gTimerEvent, TimerPeriodic, 1000000); // make me a PCD
Status = gBS->SetTimer (gTimerEvent, TimerPeriodic, 1000000ULL); // make me a PCD
ASSERT_EFI_ERROR (Status);
//Publish BlockIO.