--- /dev/null
+/** @file\r
+ UART Serial Port library instance with empty functions.\r
+\r
+ Copyright (c) 2006 - 2008, Intel Corporation\r
+ All rights reserved. This program and the accompanying materials\r
+ are licensed and made available under the terms and conditions of the BSD License\r
+ which accompanies this distribution. The full text of the license may be found at\r
+ http://opensource.org/licenses/bsd-license.php\r
+\r
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+#include <Base.h>\r
+\r
+#include <Library/SerialPortLib.h>\r
+#include <Library/IoLib.h>\r
+\r
+//---------------------------------------------\r
+// UART Register Offsets\r
+//---------------------------------------------\r
+#define BAUD_LOW_OFFSET 0x00\r
+#define BAUD_HIGH_OFFSET 0x01\r
+#define IER_OFFSET 0x01\r
+#define LCR_SHADOW_OFFSET 0x01\r
+#define FCR_SHADOW_OFFSET 0x02\r
+#define IR_CONTROL_OFFSET 0x02\r
+#define FCR_OFFSET 0x02\r
+#define EIR_OFFSET 0x02\r
+#define BSR_OFFSET 0x03\r
+#define LCR_OFFSET 0x03\r
+#define MCR_OFFSET 0x04\r
+#define LSR_OFFSET 0x05\r
+#define MSR_OFFSET 0x06\r
+\r
+//---------------------------------------------\r
+// UART Register Bit Defines\r
+//---------------------------------------------\r
+#define LSR_TXRDY 0x20\r
+#define LSR_RXDA 0x01\r
+#define DLAB 0x01\r
+\r
+//---------------------------------------------\r
+// UART Settings\r
+//---------------------------------------------\r
+UINT16 gUartBase = 0x3F8;\r
+UINTN gBps = 115200;\r
+UINT8 gData = 8;\r
+UINT8 gStop = 1;\r
+UINT8 gParity = 0;\r
+UINT8 gBreakSet = 0;\r
+\r
+/**\r
+ Initialize the serial device hardware.\r
+ \r
+ If no initialization is required, then return RETURN_SUCCESS.\r
+ If the serial device was successfuly initialized, then return RETURN_SUCCESS.\r
+ If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.\r
+ \r
+ @retval RETURN_SUCCESS The serial device was initialized.\r
+ @retval RETURN_DEVICE_ERROR The serail device could not be initialized.\r
+\r
+**/\r
+RETURN_STATUS\r
+EFIAPI\r
+SerialPortInitialize (\r
+ VOID\r
+ )\r
+{\r
+ UINTN Divisor;\r
+ UINT8 OutputData;\r
+ UINT8 Data;\r
+\r
+ //\r
+ // Map 5..8 to 0..3\r
+ //\r
+ Data = (UINT8) (gData - (UINT8) 5);\r
+\r
+ //\r
+ // Calculate divisor for baud generator\r
+ //\r
+ Divisor = 115200 / gBps;\r
+ \r
+ //\r
+ // Set communications format\r
+ //\r
+ OutputData = (UINT8) ((DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);\r
+ IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);\r
+\r
+ //\r
+ // Configure baud rate\r
+ //\r
+ IoWrite8 ((UINTN) (gUartBase + BAUD_HIGH_OFFSET), (UINT8) (Divisor >> 8));\r
+ IoWrite8 ((UINTN) (gUartBase + BAUD_LOW_OFFSET), (UINT8) (Divisor & 0xff));\r
+\r
+ //\r
+ // Switch back to bank 0\r
+ //\r
+ OutputData = (UINT8) ((~DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);\r
+ IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);\r
+\r
+ return RETURN_SUCCESS;\r
+}\r
+\r
+/**\r
+ Write data from buffer to serial device. \r
+ \r
+ Writes NumberOfBytes data bytes from Buffer to the serial device. \r
+ The number of bytes actually written to the serial device is returned.\r
+ If the return value is less than NumberOfBytes, then the write operation failed.\r
+\r
+ If Buffer is NULL, then ASSERT(). \r
+\r
+ If NumberOfBytes is zero, then return 0.\r
+\r
+ @param Buffer Pointer to the data buffer to be written.\r
+ @param NumberOfBytes Number of bytes to written to the serial device.\r
+\r
+ @retval 0 NumberOfBytes is 0.\r
+ @retval >0 The number of bytes written to the serial device. \r
+ If this value is less than NumberOfBytes, then the read operation failed.\r
+\r
+**/\r
+UINTN\r
+EFIAPI\r
+SerialPortWrite (\r
+ IN UINT8 *Buffer,\r
+ IN UINTN NumberOfBytes\r
+)\r
+{\r
+ UINTN Result;\r
+ UINT8 Data;\r
+\r
+ if (Buffer == NULL) {\r
+ return 0;\r
+ }\r
+\r
+ Result = NumberOfBytes;\r
+\r
+ while (NumberOfBytes--) {\r
+ //\r
+ // Wait for the serail port to be ready.\r
+ //\r
+ do {\r
+ Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);\r
+ } while ((Data & LSR_TXRDY) == 0);\r
+ IoWrite8 ((UINT16) gUartBase, *Buffer++);\r
+ }\r
+\r
+ return Result;\r
+}\r
+\r
+\r
+/**\r
+ Reads data from a serial device into a buffer.\r
+\r
+ @param Buffer Pointer to the data buffer to store the data read from the serial device.\r
+ @param NumberOfBytes Number of bytes to read from the serial device.\r
+\r
+ @retval 0 NumberOfBytes is 0.\r
+ @retval >0 The number of bytes read from the serial device. \r
+ If this value is less than NumberOfBytes, then the read operation failed.\r
+\r
+**/\r
+UINTN\r
+EFIAPI\r
+SerialPortRead (\r
+ OUT UINT8 *Buffer,\r
+ IN UINTN NumberOfBytes\r
+)\r
+{\r
+ UINTN Result;\r
+ UINT8 Data;\r
+\r
+ if (NULL == Buffer) {\r
+ return 0;\r
+ }\r
+\r
+ Result = NumberOfBytes;\r
+\r
+ while (NumberOfBytes--) {\r
+ //\r
+ // Wait for the serail port to be ready.\r
+ //\r
+ do {\r
+ Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);\r
+ } while ((Data & LSR_RXDA) == 0);\r
+\r
+ *Buffer++ = IoRead8 ((UINT16) gUartBase);\r
+ }\r
+\r
+ return Result;\r
+}\r
+\r
+/**\r
+ Polls a serial device to see if there is any data waiting to be read.\r
+\r
+ Polls aserial device to see if there is any data waiting to be read.\r
+ If there is data waiting to be read from the serial device, then TRUE is returned.\r
+ If there is no data waiting to be read from the serial device, then FALSE is returned.\r
+\r
+ @retval TRUE Data is waiting to be read from the serial device.\r
+ @retval FALSE There is no data waiting to be read from the serial device.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+SerialPortPoll (\r
+ VOID\r
+ )\r
+{\r
+ UINT8 Data;\r
+\r
+ //\r
+ // Read the serial port status.\r
+ //\r
+ Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);\r
+\r
+ return (BOOLEAN) ((Data & LSR_RXDA) != 0);\r
+}\r
+\r
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