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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 | |
6bc77e7a | 5 | Copyright (c) 2011 - 2013, 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 | |
15e277d5 | 34 | IN OUT UINTN UartBase,\r |
35 | IN OUT UINT64 *BaudRate,\r | |
36 | IN OUT UINT32 *ReceiveFifoDepth,\r | |
37 | IN OUT EFI_PARITY_TYPE *Parity,\r | |
38 | IN OUT UINT8 *DataBits,\r | |
39 | IN OUT EFI_STOP_BITS_TYPE *StopBits\r | |
051e63bb | 40 | )\r |
41 | {\r | |
42 | UINT32 LineControl;\r | |
43 | UINT32 Divisor;\r | |
44 | \r | |
051e63bb | 45 | LineControl = 0;\r |
46 | \r | |
47 | // The PL011 supports a buffer of either 1 or 32 chars. Therefore we can accept\r | |
48 | // 1 char buffer as the minimum fifo size. Because everything can be rounded down,\r | |
49 | // there is no maximum fifo size.\r | |
15e277d5 | 50 | if ((*ReceiveFifoDepth == 0) || (*ReceiveFifoDepth >= 32)) {\r |
051e63bb | 51 | LineControl |= PL011_UARTLCR_H_FEN;\r |
15e277d5 | 52 | *ReceiveFifoDepth = 32;\r |
53 | } else {\r | |
54 | ASSERT (*ReceiveFifoDepth < 32);\r | |
051e63bb | 55 | // Nothing else to do. 1 byte fifo is default.\r |
15e277d5 | 56 | *ReceiveFifoDepth = 1;\r |
051e63bb | 57 | }\r |
58 | \r | |
59 | //\r | |
60 | // Parity\r | |
61 | //\r | |
15e277d5 | 62 | switch (*Parity) {\r |
051e63bb | 63 | case DefaultParity:\r |
15e277d5 | 64 | *Parity = NoParity;\r |
051e63bb | 65 | case NoParity:\r |
66 | // Nothing to do. Parity is disabled by default.\r | |
67 | break;\r | |
68 | case EvenParity:\r | |
69 | LineControl |= (PL011_UARTLCR_H_PEN | PL011_UARTLCR_H_EPS);\r | |
70 | break;\r | |
71 | case OddParity:\r | |
72 | LineControl |= PL011_UARTLCR_H_PEN;\r | |
73 | break;\r | |
74 | case MarkParity:\r | |
75 | LineControl |= (PL011_UARTLCR_H_PEN | PL011_UARTLCR_H_SPS | PL011_UARTLCR_H_EPS);\r | |
76 | break;\r | |
77 | case SpaceParity:\r | |
78 | LineControl |= (PL011_UARTLCR_H_PEN | PL011_UARTLCR_H_SPS);\r | |
79 | break;\r | |
80 | default:\r | |
81 | return RETURN_INVALID_PARAMETER;\r | |
82 | }\r | |
83 | \r | |
84 | //\r | |
85 | // Data Bits\r | |
86 | //\r | |
15e277d5 | 87 | switch (*DataBits) {\r |
051e63bb | 88 | case 0:\r |
15e277d5 | 89 | *DataBits = 8;\r |
051e63bb | 90 | case 8:\r |
91 | LineControl |= PL011_UARTLCR_H_WLEN_8;\r | |
92 | break;\r | |
93 | case 7:\r | |
94 | LineControl |= PL011_UARTLCR_H_WLEN_7;\r | |
95 | break;\r | |
96 | case 6:\r | |
97 | LineControl |= PL011_UARTLCR_H_WLEN_6;\r | |
98 | break;\r | |
99 | case 5:\r | |
100 | LineControl |= PL011_UARTLCR_H_WLEN_5;\r | |
101 | break;\r | |
102 | default:\r | |
103 | return RETURN_INVALID_PARAMETER;\r | |
104 | }\r | |
105 | \r | |
106 | //\r | |
107 | // Stop Bits\r | |
108 | //\r | |
15e277d5 | 109 | switch (*StopBits) {\r |
051e63bb | 110 | case DefaultStopBits:\r |
15e277d5 | 111 | *StopBits = OneStopBit;\r |
051e63bb | 112 | case OneStopBit:\r |
113 | // Nothing to do. One stop bit is enabled by default.\r | |
114 | break;\r | |
115 | case TwoStopBits:\r | |
116 | LineControl |= PL011_UARTLCR_H_STP2;\r | |
117 | break;\r | |
118 | case OneFiveStopBits:\r | |
119 | // Only 1 or 2 stops bits are supported\r | |
120 | default:\r | |
121 | return RETURN_INVALID_PARAMETER;\r | |
122 | }\r | |
40ab42dd | 123 | \r |
051e63bb | 124 | // Don't send the LineControl value to the PL011 yet,\r |
125 | // wait until after the Baud Rate setting.\r | |
126 | // This ensures we do not mess up the UART settings halfway through\r | |
127 | // in the rare case when there is an error with the Baud Rate.\r | |
128 | \r | |
129 | //\r | |
130 | // Baud Rate\r | |
131 | //\r | |
6bc77e7a | 132 | \r |
133 | // If BaudRate is zero then use default baud rate\r | |
134 | if (BaudRate == 0) {\r | |
135 | if (PcdGet32 (PL011UartInteger) != 0) {\r | |
136 | MmioWrite32 (UartBase + UARTIBRD, PcdGet32 (PL011UartInteger));\r | |
137 | MmioWrite32 (UartBase + UARTFBRD, PcdGet32 (PL011UartFractional));\r | |
138 | } else {\r | |
15e277d5 | 139 | *BaudRate = PcdGet32 (PcdSerialBaudRate);\r |
140 | ASSERT (*BaudRate != 0);\r | |
6bc77e7a | 141 | }\r |
142 | }\r | |
143 | \r | |
144 | // If BaudRate != 0 then we must calculate the divisor from the value\r | |
15e277d5 | 145 | if (*BaudRate != 0) {\r |
146 | Divisor = (PcdGet32 (PL011UartClkInHz) * 4) / *BaudRate;\r | |
051e63bb | 147 | MmioWrite32 (UartBase + UARTIBRD, Divisor >> 6);\r |
148 | MmioWrite32 (UartBase + UARTFBRD, Divisor & 0x3F);\r | |
149 | }\r | |
150 | \r | |
151 | // No parity, 1 stop, no fifo, 8 data bits\r | |
152 | MmioWrite32 (UartBase + UARTLCR_H, LineControl);\r | |
153 | \r | |
154 | // Clear any pending errors\r | |
155 | MmioWrite32 (UartBase + UARTECR, 0);\r | |
156 | \r | |
157 | // Enable tx, rx, and uart overall\r | |
158 | MmioWrite32 (UartBase + UARTCR, PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN);\r | |
159 | \r | |
160 | return RETURN_SUCCESS;\r | |
161 | }\r | |
162 | \r | |
163 | /**\r | |
164 | Set the serial device control bits.\r | |
165 | \r | |
166 | @param UartBase The base address of the PL011 UART.\r | |
167 | @param Control Control bits which are to be set on the serial device.\r | |
168 | \r | |
169 | @retval EFI_SUCCESS The new control bits were set on the serial device.\r | |
170 | @retval EFI_UNSUPPORTED The serial device does not support this operation.\r | |
171 | @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r | |
172 | \r | |
173 | **/\r | |
174 | RETURN_STATUS\r | |
175 | EFIAPI\r | |
176 | PL011UartSetControl (\r | |
177 | IN UINTN UartBase,\r | |
178 | IN UINT32 Control\r | |
179 | )\r | |
180 | {\r | |
181 | UINT32 Bits;\r | |
182 | UINT32 ValidControlBits;\r | |
183 | \r | |
184 | ValidControlBits = ( EFI_SERIAL_REQUEST_TO_SEND\r | |
185 | | EFI_SERIAL_DATA_TERMINAL_READY\r | |
186 | // | EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE // Not implemented yet.\r | |
187 | // | EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE // Not implemented yet.\r | |
188 | | EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE\r | |
189 | );\r | |
190 | \r | |
191 | if (Control & (~ValidControlBits)) {\r | |
192 | return EFI_UNSUPPORTED;\r | |
193 | }\r | |
194 | \r | |
195 | Bits = MmioRead32 (UartBase + UARTCR);\r | |
196 | \r | |
197 | if (Control & EFI_SERIAL_REQUEST_TO_SEND) {\r | |
198 | Bits |= PL011_UARTCR_RTS;\r | |
199 | }\r | |
200 | \r | |
201 | if (Control & EFI_SERIAL_DATA_TERMINAL_READY) {\r | |
202 | Bits |= PL011_UARTCR_DTR;\r | |
203 | }\r | |
204 | \r | |
205 | if (Control & EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE) {\r | |
206 | Bits |= PL011_UARTCR_LBE;\r | |
207 | }\r | |
208 | \r | |
209 | if (Control & EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE) {\r | |
210 | Bits |= (PL011_UARTCR_CTSEN & PL011_UARTCR_RTSEN);\r | |
211 | }\r | |
212 | \r | |
213 | MmioWrite32 (UartBase + UARTCR, Bits);\r | |
214 | \r | |
215 | return RETURN_SUCCESS;\r | |
216 | }\r | |
217 | \r | |
218 | /**\r | |
219 | Get the serial device control bits.\r | |
220 | \r | |
221 | @param UartBase The base address of the PL011 UART.\r | |
222 | @param Control Control signals read from the serial device.\r | |
223 | \r | |
224 | @retval EFI_SUCCESS The control bits were read from the serial device.\r | |
225 | @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r | |
226 | \r | |
227 | **/\r | |
228 | RETURN_STATUS\r | |
229 | EFIAPI\r | |
230 | PL011UartGetControl (\r | |
231 | IN UINTN UartBase,\r | |
232 | OUT UINT32 *Control\r | |
233 | )\r | |
234 | {\r | |
235 | UINT32 FlagRegister;\r | |
236 | UINT32 ControlRegister;\r | |
237 | \r | |
238 | \r | |
239 | FlagRegister = MmioRead32 (UartBase + UARTFR);\r | |
240 | ControlRegister = MmioRead32 (UartBase + UARTCR);\r | |
241 | \r | |
242 | *Control = 0;\r | |
243 | \r | |
244 | if ((FlagRegister & PL011_UARTFR_CTS) == PL011_UARTFR_CTS) {\r | |
245 | *Control |= EFI_SERIAL_CLEAR_TO_SEND;\r | |
246 | }\r | |
247 | \r | |
248 | if ((FlagRegister & PL011_UARTFR_DSR) == PL011_UARTFR_DSR) {\r | |
249 | *Control |= EFI_SERIAL_DATA_SET_READY;\r | |
250 | }\r | |
251 | \r | |
252 | if ((FlagRegister & PL011_UARTFR_RI) == PL011_UARTFR_RI) {\r | |
253 | *Control |= EFI_SERIAL_RING_INDICATE;\r | |
254 | }\r | |
255 | \r | |
256 | if ((FlagRegister & PL011_UARTFR_DCD) == PL011_UARTFR_DCD) {\r | |
257 | *Control |= EFI_SERIAL_CARRIER_DETECT;\r | |
258 | }\r | |
259 | \r | |
260 | if ((ControlRegister & PL011_UARTCR_RTS) == PL011_UARTCR_RTS) {\r | |
261 | *Control |= EFI_SERIAL_REQUEST_TO_SEND;\r | |
262 | }\r | |
263 | \r | |
264 | if ((ControlRegister & PL011_UARTCR_DTR) == PL011_UARTCR_DTR) {\r | |
265 | *Control |= EFI_SERIAL_DATA_TERMINAL_READY;\r | |
266 | }\r | |
267 | \r | |
268 | if ((FlagRegister & PL011_UARTFR_RXFE) == PL011_UARTFR_RXFE) {\r | |
269 | *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;\r | |
270 | }\r | |
271 | \r | |
272 | if ((FlagRegister & PL011_UARTFR_TXFE) == PL011_UARTFR_TXFE) {\r | |
273 | *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;\r | |
274 | }\r | |
275 | \r | |
276 | if ((ControlRegister & (PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN)) == (PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN)) {\r | |
277 | *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;\r | |
278 | }\r | |
279 | \r | |
280 | #ifdef NEVER\r | |
281 | // ToDo: Implement EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE\r | |
282 | if ((ControlRegister & PL011_UARTCR_LBE) == PL011_UARTCR_LBE) {\r | |
283 | *Control |= EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE;\r | |
284 | }\r | |
285 | \r | |
286 | // ToDo: Implement EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE\r | |
287 | if (SoftwareLoopbackEnable) {\r | |
288 | *Control |= EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE;\r | |
289 | }\r | |
290 | #endif\r | |
291 | \r | |
292 | return RETURN_SUCCESS;\r | |
293 | }\r | |
294 | \r | |
295 | /**\r | |
296 | Write data to serial device.\r | |
297 | \r | |
298 | @param Buffer Point of data buffer which need to be written.\r | |
299 | @param NumberOfBytes Number of output bytes which are cached in Buffer.\r | |
300 | \r | |
301 | @retval 0 Write data failed.\r | |
302 | @retval !0 Actual number of bytes written to serial device.\r | |
303 | \r | |
304 | **/\r | |
305 | UINTN\r | |
306 | EFIAPI\r | |
307 | PL011UartWrite (\r | |
308 | IN UINTN UartBase,\r | |
309 | IN UINT8 *Buffer,\r | |
310 | IN UINTN NumberOfBytes\r | |
311 | )\r | |
312 | {\r | |
ebef1b74 | 313 | UINT8* CONST Final = &Buffer[NumberOfBytes];\r |
051e63bb | 314 | \r |
ebef1b74 | 315 | while (Buffer < Final) {\r |
316 | // Wait until UART able to accept another char\r | |
317 | while ((MmioRead32 (UartBase + UARTFR) & UART_TX_FULL_FLAG_MASK));\r | |
318 | \r | |
cdd3f032 | 319 | MmioWrite8 (UartBase + UARTDR, *Buffer++);\r |
40ab42dd | 320 | }\r |
051e63bb | 321 | \r |
40ab42dd | 322 | return NumberOfBytes;\r |
051e63bb | 323 | }\r |
324 | \r | |
325 | /**\r | |
326 | Read data from serial device and save the data in buffer.\r | |
327 | \r | |
328 | @param Buffer Point of data buffer which need to be written.\r | |
329 | @param NumberOfBytes Number of output bytes which are cached in Buffer.\r | |
330 | \r | |
331 | @retval 0 Read data failed.\r | |
332 | @retval !0 Actual number of bytes read from serial device.\r | |
333 | \r | |
334 | **/\r | |
335 | UINTN\r | |
336 | EFIAPI\r | |
337 | PL011UartRead (\r | |
338 | IN UINTN UartBase,\r | |
339 | OUT UINT8 *Buffer,\r | |
340 | IN UINTN NumberOfBytes\r | |
341 | )\r | |
342 | {\r | |
343 | UINTN Count;\r | |
344 | \r | |
40ab42dd | 345 | for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {\r |
346 | while ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) != 0);\r | |
cdd3f032 | 347 | *Buffer = MmioRead8 (UartBase + UARTDR);\r |
40ab42dd | 348 | }\r |
051e63bb | 349 | \r |
40ab42dd | 350 | return NumberOfBytes;\r |
051e63bb | 351 | }\r |
352 | \r | |
353 | /**\r | |
354 | Check to see if any data is available to be read from the debug device.\r | |
355 | \r | |
356 | @retval EFI_SUCCESS At least one byte of data is available to be read\r | |
357 | @retval EFI_NOT_READY No data is available to be read\r | |
358 | @retval EFI_DEVICE_ERROR The serial device is not functioning properly\r | |
359 | \r | |
360 | **/\r | |
361 | BOOLEAN\r | |
362 | EFIAPI\r | |
363 | PL011UartPoll (\r | |
364 | IN UINTN UartBase\r | |
365 | )\r | |
366 | {\r | |
367 | return ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) == 0);\r | |
368 | }\r |