Revision: 18964
http://sourceforge.net/p/edk2/code/18964
Author: lzeng14
Date: 2015-11-26 08:47:15 +0000 (Thu, 26 Nov 2015)
Log Message:
-----------
PcAtChipsetPkg SerialIoLib: Implement Get(Set)Control/SetAttributes
Cc: Michael D Kinney <[email protected]>
Cc: Liming Gao <[email protected]>
Cc: Ruiyu Ni <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <[email protected]>
Reviewed-by: Liming Gao <[email protected]>
Reviewed-by: Michael D Kinney <[email protected]>
Modified Paths:
--------------
trunk/edk2/PcAtChipsetPkg/Library/SerialIoLib/SerialPortLib.c
Modified: trunk/edk2/PcAtChipsetPkg/Library/SerialIoLib/SerialPortLib.c
===================================================================
--- trunk/edk2/PcAtChipsetPkg/Library/SerialIoLib/SerialPortLib.c
2015-11-26 08:46:52 UTC (rev 18963)
+++ trunk/edk2/PcAtChipsetPkg/Library/SerialIoLib/SerialPortLib.c
2015-11-26 08:47:15 UTC (rev 18964)
@@ -39,6 +39,12 @@
#define LSR_TXRDY 0x20
#define LSR_RXDA 0x01
#define DLAB 0x01
+#define MCR_DTRC 0x01
+#define MCR_RTS 0x02
+#define MSR_CTS 0x10
+#define MSR_DSR 0x20
+#define MSR_RI 0x40
+#define MSR_DCD 0x80
//---------------------------------------------
// UART Settings
@@ -219,3 +225,273 @@
return (BOOLEAN) ((Data & LSR_RXDA) != 0);
}
+/**
+ Sets the control bits on a serial device.
+
+ @param Control Sets the bits of Control that are settable.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ UINT8 Mcr;
+
+ //
+ // First determine the parameter is invalid.
+ //
+ if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND |
EFI_SERIAL_DATA_TERMINAL_READY))) != 0) {
+ return RETURN_UNSUPPORTED;
+ }
+
+ //
+ // Read the Modem Control Register.
+ //
+ Mcr = IoRead8 ((UINT16) gUartBase + MCR_OFFSET);
+ Mcr &= (~(MCR_DTRC | MCR_RTS));
+
+ if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) ==
EFI_SERIAL_DATA_TERMINAL_READY) {
+ Mcr |= MCR_DTRC;
+ }
+
+ if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) {
+ Mcr |= MCR_RTS;
+ }
+
+ //
+ // Write the Modem Control Register.
+ //
+ IoWrite8 ((UINT16) gUartBase + MCR_OFFSET, Mcr);
+
+ return RETURN_SUCCESS;
+}
+
+/**
+ Retrieve the status of the control bits on a serial device.
+
+ @param Control A pointer to return the current control
signals from the serial device.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+ UINT8 Msr;
+ UINT8 Mcr;
+ UINT8 Lsr;
+
+ *Control = 0;
+
+ //
+ // Read the Modem Status Register.
+ //
+ Msr = IoRead8 ((UINT16) gUartBase + MSR_OFFSET);
+
+ if ((Msr & MSR_CTS) == MSR_CTS) {
+ *Control |= EFI_SERIAL_CLEAR_TO_SEND;
+ }
+
+ if ((Msr & MSR_DSR) == MSR_DSR) {
+ *Control |= EFI_SERIAL_DATA_SET_READY;
+ }
+
+ if ((Msr & MSR_RI) == MSR_RI) {
+ *Control |= EFI_SERIAL_RING_INDICATE;
+ }
+
+ if ((Msr & MSR_DCD) == MSR_DCD) {
+ *Control |= EFI_SERIAL_CARRIER_DETECT;
+ }
+
+ //
+ // Read the Modem Control Register.
+ //
+ Mcr = IoRead8 ((UINT16) gUartBase + MCR_OFFSET);
+
+ if ((Mcr & MCR_DTRC) == MCR_DTRC) {
+ *Control |= EFI_SERIAL_DATA_TERMINAL_READY;
+ }
+
+ if ((Mcr & MCR_RTS) == MCR_RTS) {
+ *Control |= EFI_SERIAL_REQUEST_TO_SEND;
+ }
+
+ //
+ // Read the Line Status Register.
+ //
+ Lsr = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
+
+ if ((Lsr & LSR_TXRDY) == LSR_TXRDY) {
+ *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
+ }
+
+ if ((Lsr & LSR_RXDA) == 0) {
+ *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;
+ }
+
+ return RETURN_SUCCESS;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0
will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReveiveFifoDepth The requested depth of the FIFO on the receive
side of the
+ serial interface. A ReceiveFifoDepth value of 0
will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in
microseconds.
+ This timeout applies to both the transmit and
receive side of the
+ interface. A Timeout value of 0 will use the
device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A
Parity value of
+ DefaultParity will use the device's default parity
value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial
device. A DataBits
+ vaule of 0 will use the device's default data bit
setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial
device. A StopBits
+ value of DefaultStopBits will use the device's
default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an
unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning
correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ UINTN Divisor;
+ UINT8 OutputData;
+ UINT8 LcrData;
+ UINT8 LcrParity;
+ UINT8 LcrStop;
+
+ //
+ // Check for default settings and fill in actual values.
+ //
+ if (*BaudRate == 0) {
+ *BaudRate = gBps;
+ }
+
+ if (*DataBits == 0) {
+ *DataBits = gData;
+ }
+
+ if (*Parity == DefaultParity) {
+ *Parity = NoParity;
+ }
+
+ if (*StopBits == DefaultStopBits) {
+ *StopBits = OneStopBit;
+ }
+
+ if ((*DataBits < 5) || (*DataBits > 8)) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ if ((*Parity < NoParity) || (*Parity > SpaceParity)) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ if ((*StopBits < OneStopBit) || (*StopBits > TwoStopBits)) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ //
+ // Map 5..8 to 0..3
+ //
+ LcrData = (UINT8) (*DataBits - (UINT8) 5);
+
+ switch (*Parity) {
+ case NoParity:
+ LcrParity = 0;
+ break;
+
+ case EvenParity:
+ LcrParity = 3;
+ break;
+
+ case OddParity:
+ LcrParity = 1;
+ break;
+
+ case SpaceParity:
+ LcrParity = 7;
+ break;
+
+ case MarkParity:
+ LcrParity = 5;
+ break;
+
+ default:
+ break;
+ }
+
+ switch (*StopBits) {
+ case OneStopBit:
+ LcrStop = 0;
+ break;
+
+ case OneFiveStopBits:
+ case TwoStopBits:
+ LcrStop = 1;
+ break;
+
+ default:
+ break;
+ }
+
+ //
+ // Calculate divisor for baud generator
+ //
+ Divisor = 115200 / (UINTN) *BaudRate;
+
+ //
+ // Set communications format
+ //
+ OutputData = (UINT8) ((DLAB << 7) | (gBreakSet << 6) | (LcrParity << 3) |
(LcrStop << 2) | LcrData);
+ IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);
+
+ //
+ // Configure baud rate
+ //
+ IoWrite8 ((UINTN) (gUartBase + BAUD_HIGH_OFFSET), (UINT8) (Divisor >> 8));
+ IoWrite8 ((UINTN) (gUartBase + BAUD_LOW_OFFSET), (UINT8) (Divisor & 0xff));
+
+ //
+ // Switch back to bank 0
+ //
+ OutputData = (UINT8) ((~DLAB << 7) | (gBreakSet << 6) | (LcrParity << 3) |
(LcrStop << 2) | LcrData);
+ IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);
+
+ return RETURN_SUCCESS;
+}
+
------------------------------------------------------------------------------
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