From 2b649f74775d0efd1e75c91f77c3045ae6249cb4 Mon Sep 17 00:00:00 2001
From: andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 4 May 2010 16:34:38 +0000
Subject: [PATCH] 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
---
 Omap35xxPkg/Include/Omap3530/Omap3530Dma.h   |  3 +--
 Omap35xxPkg/Include/Omap3530/Omap3530MMCHS.h |  3 +++
 Omap35xxPkg/MMCHSDxe/MMCHS.c                 | 21 +++++++++++++++++++-
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/Omap35xxPkg/Include/Omap3530/Omap3530Dma.h b/Omap35xxPkg/Include/Omap3530/Omap3530Dma.h
index 1b67a570db..927c6f2702 100755
--- a/Omap35xxPkg/Include/Omap3530/Omap3530Dma.h
+++ b/Omap35xxPkg/Include/Omap3530/Omap3530Dma.h
@@ -97,7 +97,6 @@
 
 #define DMA4_CCR_CONST_FILL_ENABLE        BIT16
 #define DMA4_CCR_TRANSPARENT_COPY_ENABLE  BIT17
-
-
+  
 #endif 
 
diff --git a/Omap35xxPkg/Include/Omap3530/Omap3530MMCHS.h b/Omap35xxPkg/Include/Omap3530/Omap3530MMCHS.h
index 80dfc1d97c..d4abf305f0 100644
--- a/Omap35xxPkg/Include/Omap3530/Omap3530MMCHS.h
+++ b/Omap35xxPkg/Include/Omap3530/Omap3530MMCHS.h
@@ -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__
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.
-- 
2.39.2