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ArmVirtualizationPkg: move early UART discovery to PlatformPeim

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This is partially motivated by the desire to use PrePi in a virt
environment, and in that configuration, ArmPlatformInitializeSystemMemory()
is never called. But actually, this is a more suitable place anyway.

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16958 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
2015-02-28 20:25:48 +00:00
committed by lersek
parent ada518b7d6
commit 337d450e20
4 changed files with 53 additions and 47 deletions
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48
ArmPlatformPkg/ArmVirtualizationPkg/Library/PlatformPeiLib/PlatformPeiLib.c
View File

@@ -21,6 +21,8 @@
#include <Library/PcdLib.h>
#include <libfdt.h>
#include <Guid/EarlyPL011BaseAddress.h>
EFI_STATUS
EFIAPI
PlatformPeim (
@@ -30,6 +32,14 @@ PlatformPeim (
VOID *Base;
VOID *NewBase;
UINTN FdtSize;
UINT64 *UartHobData;
INT32 Node, Prev;
CONST CHAR8 *Compatible;
CONST CHAR8 *CompItem;
INT32 Len;
CONST UINT64 *RegProp;
UINT64 UartBase;
Base = (VOID*)(UINTN)FixedPcdGet64 (PcdDeviceTreeInitialBaseAddress);
ASSERT (fdt_check_header (Base) == 0);
@@ -41,6 +51,44 @@ PlatformPeim (
CopyMem (NewBase, Base, FdtSize);
PcdSet64 (PcdDeviceTreeBaseAddress, (UINT64)(UINTN)NewBase);
UartHobData = BuildGuidHob (&gEarlyPL011BaseAddressGuid, sizeof *UartHobData);
ASSERT (UartHobData != NULL);
*UartHobData = 0;
//
// Look for a UART node
//
for (Prev = 0;; Prev = Node) {
Node = fdt_next_node (Base, Prev, NULL);
if (Node < 0) {
break;
}
//
// Check for UART node
//
Compatible = fdt_getprop (Base, Node, "compatible", &Len);
//
// Iterate over the NULL-separated items in the compatible string
//
for (CompItem = Compatible; CompItem != NULL && CompItem < Compatible + Len;
CompItem += 1 + AsciiStrLen (CompItem)) {
if (AsciiStrCmp (CompItem, "arm,pl011") == 0) {
RegProp = fdt_getprop (Base, Node, "reg", &Len);
ASSERT (Len == 16);
UartBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
DEBUG ((EFI_D_INFO, "%a: PL011 UART @ 0x%lx\n", __FUNCTION__, UartBase));
*UartHobData = UartBase;
break;
}
}
}
BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
return EFI_SUCCESS;