diff options
| author | andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-05-04 16:34:38 +0000 |
|---|---|---|
| committer | andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-05-04 16:34:38 +0000 |
| commit | 2b649f74775d0efd1e75c91f77c3045ae6249cb4 (patch) | |
| tree | a39286cb968284f49d1dba3642386eea4ef023ae /Omap35xxPkg/MMCHSDxe/MMCHS.c | |
| parent | f6381f4c3d338f9056b8af24d4e8b3f8e23ad64b (diff) | |
| download | edk2-platforms-2b649f74775d0efd1e75c91f77c3045ae6249cb4.tar.xz | |
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
Diffstat (limited to 'Omap35xxPkg/MMCHSDxe/MMCHS.c')
| -rw-r--r-- | Omap35xxPkg/MMCHSDxe/MMCHS.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/Omap35xxPkg/MMCHSDxe/MMCHS.c b/Omap35xxPkg/MMCHSDxe/MMCHS.c index 61bf215f7e..a6d2940cc9 100644 --- a/Omap35xxPkg/MMCHSDxe/MMCHS.c +++ b/Omap35xxPkg/MMCHSDxe/MMCHS.c @@ -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. |