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1 | /** @file\r |
2 | Serial I/O Port library functions with no library constructor/destructor\r |
3 | \r |
4 | \r |
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5 | Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r |
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6 | \r |
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7 | This program and the accompanying materials\r |
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8 | are licensed and made available under the terms and conditions of the BSD License\r |
9 | which accompanies this distribution. The full text of the license may be found at\r |
10 | http://opensource.org/licenses/bsd-license.php\r |
11 | \r |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
14 | \r |
15 | **/\r |
16 | \r |
17 | #include <Base.h>\r |
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18 | #include <Library/SerialPortLib.h>\r |
19 | #include <Library/PcdLib.h>\r |
20 | #include <Library/IoLib.h>\r |
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21 | \r |
22 | #include <ArmEb/ArmEb.h>\r |
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23 | \r |
24 | /*\r |
25 | \r |
26 | Programmed hardware of Serial port.\r |
27 | \r |
28 | @return Always return EFI_UNSUPPORTED.\r |
29 | \r |
30 | **/\r |
31 | RETURN_STATUS\r |
32 | EFIAPI\r |
33 | SerialPortInitialize (\r |
34 | VOID\r |
35 | )\r |
36 | {\r |
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37 | UINT32 Base = PcdGet32 (PcdConsoleUartBase);\r |
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38 | \r |
39 | // initialize baud rate generator to 115200 based on EB clock REFCLK24MHZ\r |
40 | MmioWrite32 (Base + UARTIBRD, UART_115200_IDIV);\r |
41 | MmioWrite32 (Base + UARTFBRD, UART_115200_FDIV);\r |
42 | \r |
43 | // no parity, 1 stop, no fifo, 8 data bits\r |
44 | MmioWrite32 (Base + UARTLCR_H, 0x60);\r |
45 | \r |
46 | // clear any pending errors\r |
47 | MmioWrite32 (Base + UARTECR, 0);\r |
48 | \r |
49 | // enable tx, rx, and uart overall\r |
50 | MmioWrite32 (Base + UARTCR, 0x301);\r |
51 | \r |
52 | return RETURN_SUCCESS;\r |
53 | }\r |
54 | \r |
55 | /**\r |
56 | Write data to serial device.\r |
57 | \r |
58 | @param Buffer Point of data buffer which need to be writed.\r |
59 | @param NumberOfBytes Number of output bytes which are cached in Buffer.\r |
60 | \r |
61 | @retval 0 Write data failed.\r |
62 | @retval !0 Actual number of bytes writed to serial device.\r |
63 | \r |
64 | **/\r |
65 | UINTN\r |
66 | EFIAPI\r |
67 | SerialPortWrite (\r |
68 | IN UINT8 *Buffer,\r |
69 | IN UINTN NumberOfBytes\r |
70 | )\r |
71 | {\r |
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72 | UINT32 FR = PcdGet32 (PcdConsoleUartBase) + UARTFR;\r |
73 | UINT32 DR = PcdGet32 (PcdConsoleUartBase) + UARTDR;\r |
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74 | UINTN Count;\r |
75 | \r |
76 | for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {\r |
77 | while ((MmioRead32 (FR) & UART_TX_EMPTY_FLAG_MASK) != 0);\r |
78 | MmioWrite8 (DR, *Buffer);\r |
79 | }\r |
80 | \r |
81 | return NumberOfBytes;\r |
82 | }\r |
83 | \r |
84 | \r |
85 | /**\r |
86 | Read data from serial device and save the datas in buffer.\r |
87 | \r |
88 | @param Buffer Point of data buffer which need to be writed.\r |
89 | @param NumberOfBytes Number of output bytes which are cached in Buffer.\r |
90 | \r |
91 | @retval 0 Read data failed.\r |
92 | @retval !0 Aactual number of bytes read from serial device.\r |
93 | \r |
94 | **/\r |
95 | UINTN\r |
96 | EFIAPI\r |
97 | SerialPortRead (\r |
98 | OUT UINT8 *Buffer,\r |
99 | IN UINTN NumberOfBytes\r |
100 | )\r |
101 | {\r |
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102 | UINT32 FR = PcdGet32 (PcdConsoleUartBase) + UARTFR;\r |
103 | UINT32 DR = PcdGet32 (PcdConsoleUartBase) + UARTDR;\r |
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104 | UINTN Count;\r |
105 | \r |
106 | for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {\r |
107 | while ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0);\r |
108 | *Buffer = MmioRead8 (DR);\r |
109 | }\r |
110 | \r |
111 | return NumberOfBytes;\r |
112 | }\r |
113 | \r |
114 | \r |
115 | /**\r |
116 | Check to see if any data is avaiable to be read from the debug device.\r |
117 | \r |
118 | @retval EFI_SUCCESS At least one byte of data is avaiable to be read\r |
119 | @retval EFI_NOT_READY No data is avaiable to be read\r |
120 | @retval EFI_DEVICE_ERROR The serial device is not functioning properly\r |
121 | \r |
122 | **/\r |
123 | BOOLEAN\r |
124 | EFIAPI\r |
125 | SerialPortPoll (\r |
126 | VOID\r |
127 | )\r |
128 | {\r |
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129 | UINT32 FR = PcdGet32 (PcdConsoleUartBase) + UARTFR;\r |
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130 | \r |
131 | if ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0) {\r |
132 | return TRUE;\r |
133 | } else {\r |
134 | return FALSE;\r |
135 | }\r |
136 | }\r |
137 | \r |