diff options
Diffstat (limited to 'ArmPlatformPkg')
| -rw-r--r-- | ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c | 7 | ||||
| -rw-r--r-- | ArmPlatformPkg/Include/Drivers/PL011Uart.h | 8 |
2 files changed, 13 insertions, 2 deletions
diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c index 7e74a05..8b256de 100644 --- a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c +++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c @@ -50,12 +50,15 @@ PL011UartInitializePort ( LineControl = 0;
- // The PL011 supports a buffer of either 1 or 32 chars. Therefore we can accept
+ // The PL011 supports a buffer of 1, 16 or 32 chars. Therefore we can accept
// 1 char buffer as the minimum fifo size. Because everything can be rounded down,
// there is no maximum fifo size.
if ((*ReceiveFifoDepth == 0) || (*ReceiveFifoDepth >= 32)) {
LineControl |= PL011_UARTLCR_H_FEN;
- *ReceiveFifoDepth = 32;
+ if (PL011_UARTPID2_VER (MmioRead32 (UartBase + UARTPID2)) > PL011_VER_R1P4)
+ *ReceiveFifoDepth = 32;
+ else
+ *ReceiveFifoDepth = 16;
} else {
ASSERT (*ReceiveFifoDepth < 32);
// Nothing else to do. 1 byte fifo is default.
diff --git a/ArmPlatformPkg/Include/Drivers/PL011Uart.h b/ArmPlatformPkg/Include/Drivers/PL011Uart.h index 6675cef..2fe796f 100644 --- a/ArmPlatformPkg/Include/Drivers/PL011Uart.h +++ b/ArmPlatformPkg/Include/Drivers/PL011Uart.h @@ -35,6 +35,11 @@ #define UARTICR 0x044
#define UARTDMACR 0x048
+#define UARTPID0 0xFE0
+#define UARTPID1 0xFE4
+#define UARTPID2 0xFE8
+#define UARTPID3 0xFEC
+
// Data status bits
#define UART_DATA_ERROR_MASK 0x0F00
@@ -81,6 +86,9 @@ #define PL011_UARTLCR_H_PEN (1 << 1) // Parity Enable
#define PL011_UARTLCR_H_BRK (1 << 0) // Send break
+#define PL011_UARTPID2_VER(X) (((X) >> 4) & 0xF)
+#define PL011_VER_R1P4 0x2
+
/*
Programmed hardware of Serial port.
|