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ArmPlatformPkg/PL011Uart: Ignore BAUD rate if Integral non-zero

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


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14432 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin 2013-06-19 18:06:12 +00:00 committed by oliviermartin
parent c57482d11c
commit ec6b73d7a6
1 changed files with 5 additions and 7 deletions
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12
ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c
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@ -130,19 +130,17 @@ PL011UartInitializePort (
// Baud Rate // Baud Rate
// //
// If BaudRate is zero then use default baud rate // If PL011 Integral value has been defined then always ignore the BAUD rate
if (*BaudRate == 0) { if (PcdGet32 (PL011UartInteger) != 0) {
if (PcdGet32 (PL011UartInteger) != 0) {
MmioWrite32 (UartBase + UARTIBRD, PcdGet32 (PL011UartInteger)); MmioWrite32 (UartBase + UARTIBRD, PcdGet32 (PL011UartInteger));
MmioWrite32 (UartBase + UARTFBRD, PcdGet32 (PL011UartFractional)); MmioWrite32 (UartBase + UARTFBRD, PcdGet32 (PL011UartFractional));
} else { } else {
// If BAUD rate is zero then replace it with the system default value
if (*BaudRate == 0) {
*BaudRate = PcdGet32 (PcdSerialBaudRate); *BaudRate = PcdGet32 (PcdSerialBaudRate);
ASSERT (*BaudRate != 0); ASSERT (*BaudRate != 0);
} }
}
// If BaudRate != 0 then we must calculate the divisor from the value
if (*BaudRate != 0) {
Divisor = (PcdGet32 (PL011UartClkInHz) * 4) / *BaudRate; Divisor = (PcdGet32 (PL011UartClkInHz) * 4) / *BaudRate;
MmioWrite32 (UartBase + UARTIBRD, Divisor >> 6); MmioWrite32 (UartBase + UARTIBRD, Divisor >> 6);
MmioWrite32 (UartBase + UARTFBRD, Divisor & 0x3F); MmioWrite32 (UartBase + UARTFBRD, Divisor & 0x3F);