From 6bc77e7a21155b247d9eb2b1ab93214f07bf194e Mon Sep 17 00:00:00 2001
From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Sun, 14 Apr 2013 09:23:30 +0000
Subject: ArmPlatformPkg/PL011Uart: Added support for default BaudRate

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14261 6f19259b-4bc3-4df7-8a09-765794883524
---
 ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c   | 25 +++++++++++++++----------
 ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf |  5 ++++-
 2 files changed, 19 insertions(+), 11 deletions(-)

(limited to 'ArmPlatformPkg/Drivers')

diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c
index 2af207829d..d9280cd0bb 100644
--- a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c
+++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c
@@ -2,7 +2,7 @@
   Serial I/O Port library functions with no library constructor/destructor
 
   Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
-  Copyright (c) 2011 - 2012, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -42,11 +42,6 @@ PL011UartInitializePort (
   UINT32      LineControl;
   UINT32      Divisor;
 
-  // The BaudRate must be passed
-  if (BaudRate == 0) {
-    return RETURN_INVALID_PARAMETER;
-  }
-
   LineControl = 0;
 
   // The PL011 supports a buffer of either 1 or 32 chars. Therefore we can accept
@@ -130,10 +125,20 @@ PL011UartInitializePort (
   //
   // Baud Rate
   //
-  if (PcdGet32(PL011UartInteger) != 0) {
-    MmioWrite32 (UartBase + UARTIBRD, PcdGet32(PL011UartInteger));
-    MmioWrite32 (UartBase + UARTFBRD, PcdGet32(PL011UartFractional));
-  } else {
+
+  // If BaudRate is zero then use default baud rate
+  if (BaudRate == 0) {
+    if (PcdGet32 (PL011UartInteger) != 0) {
+      MmioWrite32 (UartBase + UARTIBRD, PcdGet32 (PL011UartInteger));
+      MmioWrite32 (UartBase + UARTFBRD, PcdGet32 (PL011UartFractional));
+    } else {
+      BaudRate = PcdGet32 (PcdSerialBaudRate);
+      ASSERT (BaudRate != 0);
+    }
+  }
+
+  // If BaudRate != 0 then we must calculate the divisor from the value
+  if (BaudRate != 0) {
     Divisor = (PcdGet32 (PL011UartClkInHz) * 4) / BaudRate;
     MmioWrite32 (UartBase + UARTIBRD, Divisor >> 6);
     MmioWrite32 (UartBase + UARTFBRD, Divisor & 0x3F);
diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf
index 6347ba63f3..7f7709aecf 100644
--- a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf
+++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf
@@ -2,7 +2,7 @@
 #  
 #  Component description file for PL011Uart module
 #  
-#  Copyright (c) 2011-2012, ARM Ltd. All rights reserved.<BR>
+#  Copyright (c) 2011-2013, ARM Ltd. All rights reserved.<BR>
 #  
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
@@ -31,9 +31,12 @@
 
 [Packages]
   MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
   ArmPlatformPkg/ArmPlatformPkg.dec
 
 [Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialBaudRate
+
   gArmPlatformTokenSpaceGuid.PL011UartClkInHz
   gArmPlatformTokenSpaceGuid.PL011UartInteger
   gArmPlatformTokenSpaceGuid.PL011UartFractional
-- 
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