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051e63bb | 1 | /** @file\r |
2 | Serial I/O Port library functions with no library constructor/destructor\r | |
3 | \r | |
4 | Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
5 | Copyright (c) 2011 - 2012, ARM Ltd. All rights reserved.<BR>\r | |
40ab42dd | 6 | \r |
051e63bb | 7 | This program and the accompanying materials\r |
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 <Library/DebugLib.h>\r | |
18 | #include <Library/IoLib.h>\r | |
19 | #include <Library/PcdLib.h>\r | |
20 | \r | |
21 | #include <Drivers/PL011Uart.h>\r | |
22 | \r | |
23 | /*\r | |
24 | \r | |
25 | Initialise the serial port to the specified settings.\r | |
26 | All unspecified settings will be set to the default values.\r | |
27 | \r | |
28 | @return Always return EFI_SUCCESS or EFI_INVALID_PARAMETER.\r | |
29 | \r | |
30 | **/\r | |
31 | RETURN_STATUS\r | |
32 | EFIAPI\r | |
33 | PL011UartInitializePort (\r | |
34 | IN UINTN UartBase,\r | |
35 | IN UINT64 BaudRate,\r | |
36 | IN UINT32 ReceiveFifoDepth,\r | |
051e63bb | 37 | IN EFI_PARITY_TYPE Parity,\r |
38 | IN UINT8 DataBits,\r | |
39 | IN EFI_STOP_BITS_TYPE StopBits\r | |
40 | )\r | |
41 | {\r | |
42 | UINT32 LineControl;\r | |
43 | UINT32 Divisor;\r | |
44 | \r | |
45 | // The BaudRate must be passed\r | |
46 | if (BaudRate == 0) {\r | |
47 | return RETURN_INVALID_PARAMETER;\r | |
48 | }\r | |
40ab42dd | 49 | \r |
051e63bb | 50 | LineControl = 0;\r |
51 | \r | |
52 | // The PL011 supports a buffer of either 1 or 32 chars. Therefore we can accept\r | |
53 | // 1 char buffer as the minimum fifo size. Because everything can be rounded down,\r | |
54 | // there is no maximum fifo size.\r | |
55 | if (ReceiveFifoDepth == 0) {\r | |
56 | LineControl |= PL011_UARTLCR_H_FEN;\r | |
57 | } else if (ReceiveFifoDepth < 32) {\r | |
58 | // Nothing else to do. 1 byte fifo is default.\r | |
59 | } else if (ReceiveFifoDepth >= 32) {\r | |
60 | LineControl |= PL011_UARTLCR_H_FEN;\r | |
61 | }\r | |
62 | \r | |
63 | //\r | |
64 | // Parity\r | |
65 | //\r | |
66 | switch (Parity) {\r | |
67 | case DefaultParity:\r | |
68 | case NoParity:\r | |
69 | // Nothing to do. Parity is disabled by default.\r | |
70 | break;\r | |
71 | case EvenParity:\r | |
72 | LineControl |= (PL011_UARTLCR_H_PEN | PL011_UARTLCR_H_EPS);\r | |
73 | break;\r | |
74 | case OddParity:\r | |
75 | LineControl |= PL011_UARTLCR_H_PEN;\r | |
76 | break;\r | |
77 | case MarkParity:\r | |
78 | LineControl |= (PL011_UARTLCR_H_PEN | PL011_UARTLCR_H_SPS | PL011_UARTLCR_H_EPS);\r | |
79 | break;\r | |
80 | case SpaceParity:\r | |
81 | LineControl |= (PL011_UARTLCR_H_PEN | PL011_UARTLCR_H_SPS);\r | |
82 | break;\r | |
83 | default:\r | |
84 | return RETURN_INVALID_PARAMETER;\r | |
85 | }\r | |
86 | \r | |
87 | //\r | |
88 | // Data Bits\r | |
89 | //\r | |
90 | switch (DataBits) {\r | |
91 | case 0:\r | |
92 | case 8:\r | |
93 | LineControl |= PL011_UARTLCR_H_WLEN_8;\r | |
94 | break;\r | |
95 | case 7:\r | |
96 | LineControl |= PL011_UARTLCR_H_WLEN_7;\r | |
97 | break;\r | |
98 | case 6:\r | |
99 | LineControl |= PL011_UARTLCR_H_WLEN_6;\r | |
100 | break;\r | |
101 | case 5:\r | |
102 | LineControl |= PL011_UARTLCR_H_WLEN_5;\r | |
103 | break;\r | |
104 | default:\r | |
105 | return RETURN_INVALID_PARAMETER;\r | |
106 | }\r | |
107 | \r | |
108 | //\r | |
109 | // Stop Bits\r | |
110 | //\r | |
111 | switch (StopBits) {\r | |
112 | case DefaultStopBits:\r | |
113 | case OneStopBit:\r | |
114 | // Nothing to do. One stop bit is enabled by default.\r | |
115 | break;\r | |
116 | case TwoStopBits:\r | |
117 | LineControl |= PL011_UARTLCR_H_STP2;\r | |
118 | break;\r | |
119 | case OneFiveStopBits:\r | |
120 | // Only 1 or 2 stops bits are supported\r | |
121 | default:\r | |
122 | return RETURN_INVALID_PARAMETER;\r | |
123 | }\r | |
40ab42dd | 124 | \r |
051e63bb | 125 | // Don't send the LineControl value to the PL011 yet,\r |
126 | // wait until after the Baud Rate setting.\r | |
127 | // This ensures we do not mess up the UART settings halfway through\r | |
128 | // in the rare case when there is an error with the Baud Rate.\r | |
129 | \r | |
130 | //\r | |
131 | // Baud Rate\r | |
132 | //\r | |
133 | if (PcdGet32(PL011UartInteger) != 0) {\r | |
134 | // Integer and Factional part must be different of 0\r | |
135 | ASSERT(PcdGet32(PL011UartFractional) != 0);\r | |
40ab42dd | 136 | \r |
051e63bb | 137 | MmioWrite32 (UartBase + UARTIBRD, PcdGet32(PL011UartInteger));\r |
138 | MmioWrite32 (UartBase + UARTFBRD, PcdGet32(PL011UartFractional));\r | |
139 | } else {\r | |
140 | Divisor = (PcdGet32 (PL011UartClkInHz) * 4) / BaudRate;\r | |
141 | MmioWrite32 (UartBase + UARTIBRD, Divisor >> 6);\r | |
142 | MmioWrite32 (UartBase + UARTFBRD, Divisor & 0x3F);\r | |
143 | }\r | |
144 | \r | |
145 | // No parity, 1 stop, no fifo, 8 data bits\r | |
146 | MmioWrite32 (UartBase + UARTLCR_H, LineControl);\r | |
147 | \r | |
148 | // Clear any pending errors\r | |
149 | MmioWrite32 (UartBase + UARTECR, 0);\r | |
150 | \r | |
151 | // Enable tx, rx, and uart overall\r | |
152 | MmioWrite32 (UartBase + UARTCR, PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN);\r | |
153 | \r | |
154 | return RETURN_SUCCESS;\r | |
155 | }\r | |
156 | \r | |
157 | /**\r | |
158 | Set the serial device control bits.\r | |
159 | \r | |
160 | @param UartBase The base address of the PL011 UART.\r | |
161 | @param Control Control bits which are to be set on the serial device.\r | |
162 | \r | |
163 | @retval EFI_SUCCESS The new control bits were set on the serial device.\r | |
164 | @retval EFI_UNSUPPORTED The serial device does not support this operation.\r | |
165 | @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r | |
166 | \r | |
167 | **/\r | |
168 | RETURN_STATUS\r | |
169 | EFIAPI\r | |
170 | PL011UartSetControl (\r | |
171 | IN UINTN UartBase,\r | |
172 | IN UINT32 Control\r | |
173 | )\r | |
174 | {\r | |
175 | UINT32 Bits;\r | |
176 | UINT32 ValidControlBits;\r | |
177 | \r | |
178 | ValidControlBits = ( EFI_SERIAL_REQUEST_TO_SEND\r | |
179 | | EFI_SERIAL_DATA_TERMINAL_READY\r | |
180 | // | EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE // Not implemented yet.\r | |
181 | // | EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE // Not implemented yet.\r | |
182 | | EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE\r | |
183 | );\r | |
184 | \r | |
185 | if (Control & (~ValidControlBits)) {\r | |
186 | return EFI_UNSUPPORTED;\r | |
187 | }\r | |
188 | \r | |
189 | Bits = MmioRead32 (UartBase + UARTCR);\r | |
190 | \r | |
191 | if (Control & EFI_SERIAL_REQUEST_TO_SEND) {\r | |
192 | Bits |= PL011_UARTCR_RTS;\r | |
193 | }\r | |
194 | \r | |
195 | if (Control & EFI_SERIAL_DATA_TERMINAL_READY) {\r | |
196 | Bits |= PL011_UARTCR_DTR;\r | |
197 | }\r | |
198 | \r | |
199 | if (Control & EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE) {\r | |
200 | Bits |= PL011_UARTCR_LBE;\r | |
201 | }\r | |
202 | \r | |
203 | if (Control & EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE) {\r | |
204 | Bits |= (PL011_UARTCR_CTSEN & PL011_UARTCR_RTSEN);\r | |
205 | }\r | |
206 | \r | |
207 | MmioWrite32 (UartBase + UARTCR, Bits);\r | |
208 | \r | |
209 | return RETURN_SUCCESS;\r | |
210 | }\r | |
211 | \r | |
212 | /**\r | |
213 | Get the serial device control bits.\r | |
214 | \r | |
215 | @param UartBase The base address of the PL011 UART.\r | |
216 | @param Control Control signals read from the serial device.\r | |
217 | \r | |
218 | @retval EFI_SUCCESS The control bits were read from the serial device.\r | |
219 | @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r | |
220 | \r | |
221 | **/\r | |
222 | RETURN_STATUS\r | |
223 | EFIAPI\r | |
224 | PL011UartGetControl (\r | |
225 | IN UINTN UartBase,\r | |
226 | OUT UINT32 *Control\r | |
227 | )\r | |
228 | {\r | |
229 | UINT32 FlagRegister;\r | |
230 | UINT32 ControlRegister;\r | |
231 | \r | |
232 | \r | |
233 | FlagRegister = MmioRead32 (UartBase + UARTFR);\r | |
234 | ControlRegister = MmioRead32 (UartBase + UARTCR);\r | |
235 | \r | |
236 | *Control = 0;\r | |
237 | \r | |
238 | if ((FlagRegister & PL011_UARTFR_CTS) == PL011_UARTFR_CTS) {\r | |
239 | *Control |= EFI_SERIAL_CLEAR_TO_SEND;\r | |
240 | }\r | |
241 | \r | |
242 | if ((FlagRegister & PL011_UARTFR_DSR) == PL011_UARTFR_DSR) {\r | |
243 | *Control |= EFI_SERIAL_DATA_SET_READY;\r | |
244 | }\r | |
245 | \r | |
246 | if ((FlagRegister & PL011_UARTFR_RI) == PL011_UARTFR_RI) {\r | |
247 | *Control |= EFI_SERIAL_RING_INDICATE;\r | |
248 | }\r | |
249 | \r | |
250 | if ((FlagRegister & PL011_UARTFR_DCD) == PL011_UARTFR_DCD) {\r | |
251 | *Control |= EFI_SERIAL_CARRIER_DETECT;\r | |
252 | }\r | |
253 | \r | |
254 | if ((ControlRegister & PL011_UARTCR_RTS) == PL011_UARTCR_RTS) {\r | |
255 | *Control |= EFI_SERIAL_REQUEST_TO_SEND;\r | |
256 | }\r | |
257 | \r | |
258 | if ((ControlRegister & PL011_UARTCR_DTR) == PL011_UARTCR_DTR) {\r | |
259 | *Control |= EFI_SERIAL_DATA_TERMINAL_READY;\r | |
260 | }\r | |
261 | \r | |
262 | if ((FlagRegister & PL011_UARTFR_RXFE) == PL011_UARTFR_RXFE) {\r | |
263 | *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;\r | |
264 | }\r | |
265 | \r | |
266 | if ((FlagRegister & PL011_UARTFR_TXFE) == PL011_UARTFR_TXFE) {\r | |
267 | *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;\r | |
268 | }\r | |
269 | \r | |
270 | if ((ControlRegister & (PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN)) == (PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN)) {\r | |
271 | *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;\r | |
272 | }\r | |
273 | \r | |
274 | #ifdef NEVER\r | |
275 | // ToDo: Implement EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE\r | |
276 | if ((ControlRegister & PL011_UARTCR_LBE) == PL011_UARTCR_LBE) {\r | |
277 | *Control |= EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE;\r | |
278 | }\r | |
279 | \r | |
280 | // ToDo: Implement EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE\r | |
281 | if (SoftwareLoopbackEnable) {\r | |
282 | *Control |= EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE;\r | |
283 | }\r | |
284 | #endif\r | |
285 | \r | |
286 | return RETURN_SUCCESS;\r | |
287 | }\r | |
288 | \r | |
289 | /**\r | |
290 | Write data to serial device.\r | |
291 | \r | |
292 | @param Buffer Point of data buffer which need to be written.\r | |
293 | @param NumberOfBytes Number of output bytes which are cached in Buffer.\r | |
294 | \r | |
295 | @retval 0 Write data failed.\r | |
296 | @retval !0 Actual number of bytes written to serial device.\r | |
297 | \r | |
298 | **/\r | |
299 | UINTN\r | |
300 | EFIAPI\r | |
301 | PL011UartWrite (\r | |
302 | IN UINTN UartBase,\r | |
303 | IN UINT8 *Buffer,\r | |
304 | IN UINTN NumberOfBytes\r | |
305 | )\r | |
306 | {\r | |
40ab42dd | 307 | UINTN Count;\r |
051e63bb | 308 | \r |
40ab42dd | 309 | for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {\r |
310 | while ((MmioRead32 (UartBase + UARTFR) & UART_TX_EMPTY_FLAG_MASK) == 0);\r | |
311 | MmioWrite8 (UartBase + UARTDR, *Buffer);\r | |
312 | }\r | |
051e63bb | 313 | \r |
40ab42dd | 314 | return NumberOfBytes;\r |
051e63bb | 315 | }\r |
316 | \r | |
317 | /**\r | |
318 | Read data from serial device and save the data in buffer.\r | |
319 | \r | |
320 | @param Buffer Point of data buffer which need to be written.\r | |
321 | @param NumberOfBytes Number of output bytes which are cached in Buffer.\r | |
322 | \r | |
323 | @retval 0 Read data failed.\r | |
324 | @retval !0 Actual number of bytes read from serial device.\r | |
325 | \r | |
326 | **/\r | |
327 | UINTN\r | |
328 | EFIAPI\r | |
329 | PL011UartRead (\r | |
330 | IN UINTN UartBase,\r | |
331 | OUT UINT8 *Buffer,\r | |
332 | IN UINTN NumberOfBytes\r | |
333 | )\r | |
334 | {\r | |
335 | UINTN Count;\r | |
336 | \r | |
40ab42dd | 337 | for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {\r |
338 | while ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) != 0);\r | |
339 | *Buffer = MmioRead8 (UartBase + UARTDR);\r | |
340 | }\r | |
051e63bb | 341 | \r |
40ab42dd | 342 | return NumberOfBytes;\r |
051e63bb | 343 | }\r |
344 | \r | |
345 | /**\r | |
346 | Check to see if any data is available to be read from the debug device.\r | |
347 | \r | |
348 | @retval EFI_SUCCESS At least one byte of data is available to be read\r | |
349 | @retval EFI_NOT_READY No data is available to be read\r | |
350 | @retval EFI_DEVICE_ERROR The serial device is not functioning properly\r | |
351 | \r | |
352 | **/\r | |
353 | BOOLEAN\r | |
354 | EFIAPI\r | |
355 | PL011UartPoll (\r | |
356 | IN UINTN UartBase\r | |
357 | )\r | |
358 | {\r | |
359 | return ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) == 0);\r | |
360 | }\r |