]>
Commit | Line | Data |
---|---|---|
1 | /** @file\r | |
2 | 16550 UART Serial Port library functions\r | |
3 | \r | |
4 | (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>\r | |
5 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
6 | Copyright (c) 2018, AMD Incorporated. All rights reserved.<BR>\r | |
7 | \r | |
8 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
9 | \r | |
10 | **/\r | |
11 | \r | |
12 | #include <Base.h>\r | |
13 | #include <IndustryStandard/Pci.h>\r | |
14 | #include <Library/SerialPortLib.h>\r | |
15 | #include <Library/PcdLib.h>\r | |
16 | #include <Library/IoLib.h>\r | |
17 | #include <Library/PciLib.h>\r | |
18 | #include <Library/PlatformHookLib.h>\r | |
19 | #include <Library/BaseLib.h>\r | |
20 | \r | |
21 | //\r | |
22 | // PCI Defintions.\r | |
23 | //\r | |
24 | #define PCI_BRIDGE_32_BIT_IO_SPACE 0x01\r | |
25 | \r | |
26 | //\r | |
27 | // 16550 UART register offsets and bitfields\r | |
28 | //\r | |
29 | #define R_UART_RXBUF 0 // LCR_DLAB = 0\r | |
30 | #define R_UART_TXBUF 0 // LCR_DLAB = 0\r | |
31 | #define R_UART_BAUD_LOW 0 // LCR_DLAB = 1\r | |
32 | #define R_UART_BAUD_HIGH 1 // LCR_DLAB = 1\r | |
33 | #define R_UART_IER 1 // LCR_DLAB = 0\r | |
34 | #define R_UART_FCR 2\r | |
35 | #define B_UART_FCR_FIFOE BIT0\r | |
36 | #define B_UART_FCR_FIFO64 BIT5\r | |
37 | #define R_UART_LCR 3\r | |
38 | #define B_UART_LCR_DLAB BIT7\r | |
39 | #define R_UART_MCR 4\r | |
40 | #define B_UART_MCR_DTRC BIT0\r | |
41 | #define B_UART_MCR_RTS BIT1\r | |
42 | #define R_UART_LSR 5\r | |
43 | #define B_UART_LSR_RXRDY BIT0\r | |
44 | #define B_UART_LSR_TXRDY BIT5\r | |
45 | #define B_UART_LSR_TEMT BIT6\r | |
46 | #define R_UART_MSR 6\r | |
47 | #define B_UART_MSR_CTS BIT4\r | |
48 | #define B_UART_MSR_DSR BIT5\r | |
49 | #define B_UART_MSR_RI BIT6\r | |
50 | #define B_UART_MSR_DCD BIT7\r | |
51 | \r | |
52 | //\r | |
53 | // 4-byte structure for each PCI node in PcdSerialPciDeviceInfo\r | |
54 | //\r | |
55 | typedef struct {\r | |
56 | UINT8 Device;\r | |
57 | UINT8 Function;\r | |
58 | UINT16 PowerManagementStatusAndControlRegister;\r | |
59 | } PCI_UART_DEVICE_INFO;\r | |
60 | \r | |
61 | /**\r | |
62 | Read an 8-bit 16550 register. If PcdSerialUseMmio is TRUE, then the value is read from\r | |
63 | MMIO space. If PcdSerialUseMmio is FALSE, then the value is read from I/O space. The\r | |
64 | parameter Offset is added to the base address of the 16550 registers that is specified\r | |
65 | by PcdSerialRegisterBase.\r | |
66 | \r | |
67 | @param Base The base address register of UART device.\r | |
68 | @param Offset The offset of the 16550 register to read.\r | |
69 | \r | |
70 | @return The value read from the 16550 register.\r | |
71 | \r | |
72 | **/\r | |
73 | UINT8\r | |
74 | SerialPortReadRegister (\r | |
75 | UINTN Base,\r | |
76 | UINTN Offset\r | |
77 | )\r | |
78 | {\r | |
79 | if (PcdGetBool (PcdSerialUseMmio)) {\r | |
80 | return MmioRead8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride));\r | |
81 | } else {\r | |
82 | return IoRead8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride));\r | |
83 | }\r | |
84 | }\r | |
85 | \r | |
86 | /**\r | |
87 | Write an 8-bit 16550 register. If PcdSerialUseMmio is TRUE, then the value is written to\r | |
88 | MMIO space. If PcdSerialUseMmio is FALSE, then the value is written to I/O space. The\r | |
89 | parameter Offset is added to the base address of the 16550 registers that is specified\r | |
90 | by PcdSerialRegisterBase.\r | |
91 | \r | |
92 | @param Base The base address register of UART device.\r | |
93 | @param Offset The offset of the 16550 register to write.\r | |
94 | @param Value The value to write to the 16550 register specified by Offset.\r | |
95 | \r | |
96 | @return The value written to the 16550 register.\r | |
97 | \r | |
98 | **/\r | |
99 | UINT8\r | |
100 | SerialPortWriteRegister (\r | |
101 | UINTN Base,\r | |
102 | UINTN Offset,\r | |
103 | UINT8 Value\r | |
104 | )\r | |
105 | {\r | |
106 | if (PcdGetBool (PcdSerialUseMmio)) {\r | |
107 | return MmioWrite8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), Value);\r | |
108 | } else {\r | |
109 | return IoWrite8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), Value);\r | |
110 | }\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Update the value of an 16-bit PCI configuration register in a PCI device. If the\r | |
115 | PCI Configuration register specified by PciAddress is already programmed with a\r | |
116 | non-zero value, then return the current value. Otherwise update the PCI configuration\r | |
117 | register specified by PciAddress with the value specified by Value and return the\r | |
118 | value programmed into the PCI configuration register. All values must be masked\r | |
119 | using the bitmask specified by Mask.\r | |
120 | \r | |
121 | @param PciAddress PCI Library address of the PCI Configuration register to update.\r | |
122 | @param Value The value to program into the PCI Configuration Register.\r | |
123 | @param Mask Bitmask of the bits to check and update in the PCI configuration register.\r | |
124 | \r | |
125 | **/\r | |
126 | UINT16\r | |
127 | SerialPortLibUpdatePciRegister16 (\r | |
128 | UINTN PciAddress,\r | |
129 | UINT16 Value,\r | |
130 | UINT16 Mask\r | |
131 | )\r | |
132 | {\r | |
133 | UINT16 CurrentValue;\r | |
134 | \r | |
135 | CurrentValue = PciRead16 (PciAddress) & Mask;\r | |
136 | if (CurrentValue != 0) {\r | |
137 | return CurrentValue;\r | |
138 | }\r | |
139 | return PciWrite16 (PciAddress, Value & Mask);\r | |
140 | }\r | |
141 | \r | |
142 | /**\r | |
143 | Update the value of an 32-bit PCI configuration register in a PCI device. If the\r | |
144 | PCI Configuration register specified by PciAddress is already programmed with a\r | |
145 | non-zero value, then return the current value. Otherwise update the PCI configuration\r | |
146 | register specified by PciAddress with the value specified by Value and return the\r | |
147 | value programmed into the PCI configuration register. All values must be masked\r | |
148 | using the bitmask specified by Mask.\r | |
149 | \r | |
150 | @param PciAddress PCI Library address of the PCI Configuration register to update.\r | |
151 | @param Value The value to program into the PCI Configuration Register.\r | |
152 | @param Mask Bitmask of the bits to check and update in the PCI configuration register.\r | |
153 | \r | |
154 | @return The Secondary bus number that is actually programed into the PCI to PCI Bridge device.\r | |
155 | \r | |
156 | **/\r | |
157 | UINT32\r | |
158 | SerialPortLibUpdatePciRegister32 (\r | |
159 | UINTN PciAddress,\r | |
160 | UINT32 Value,\r | |
161 | UINT32 Mask\r | |
162 | )\r | |
163 | {\r | |
164 | UINT32 CurrentValue;\r | |
165 | \r | |
166 | CurrentValue = PciRead32 (PciAddress) & Mask;\r | |
167 | if (CurrentValue != 0) {\r | |
168 | return CurrentValue;\r | |
169 | }\r | |
170 | return PciWrite32 (PciAddress, Value & Mask);\r | |
171 | }\r | |
172 | \r | |
173 | /**\r | |
174 | Retrieve the I/O or MMIO base address register for the PCI UART device.\r | |
175 | \r | |
176 | This function assumes Root Bus Numer is Zero, and enables I/O and MMIO in PCI UART\r | |
177 | Device if they are not already enabled.\r | |
178 | \r | |
179 | @return The base address register of the UART device.\r | |
180 | \r | |
181 | **/\r | |
182 | UINTN\r | |
183 | GetSerialRegisterBase (\r | |
184 | VOID\r | |
185 | )\r | |
186 | {\r | |
187 | UINTN PciLibAddress;\r | |
188 | UINTN BusNumber;\r | |
189 | UINTN SubordinateBusNumber;\r | |
190 | UINT32 ParentIoBase;\r | |
191 | UINT32 ParentIoLimit;\r | |
192 | UINT16 ParentMemoryBase;\r | |
193 | UINT16 ParentMemoryLimit;\r | |
194 | UINT32 IoBase;\r | |
195 | UINT32 IoLimit;\r | |
196 | UINT16 MemoryBase;\r | |
197 | UINT16 MemoryLimit;\r | |
198 | UINTN SerialRegisterBase;\r | |
199 | UINTN BarIndex;\r | |
200 | UINT32 RegisterBaseMask;\r | |
201 | PCI_UART_DEVICE_INFO *DeviceInfo;\r | |
202 | \r | |
203 | //\r | |
204 | // Get PCI Device Info\r | |
205 | //\r | |
206 | DeviceInfo = (PCI_UART_DEVICE_INFO *) PcdGetPtr (PcdSerialPciDeviceInfo);\r | |
207 | \r | |
208 | //\r | |
209 | // If PCI Device Info is empty, then assume fixed address UART and return PcdSerialRegisterBase\r | |
210 | //\r | |
211 | if (DeviceInfo->Device == 0xff) {\r | |
212 | return (UINTN)PcdGet64 (PcdSerialRegisterBase);\r | |
213 | }\r | |
214 | \r | |
215 | //\r | |
216 | // Assume PCI Bus 0 I/O window is 0-64KB and MMIO windows is 0-4GB\r | |
217 | //\r | |
218 | ParentMemoryBase = 0 >> 16;\r | |
219 | ParentMemoryLimit = 0xfff00000 >> 16;\r | |
220 | ParentIoBase = 0 >> 12;\r | |
221 | ParentIoLimit = 0xf000 >> 12;\r | |
222 | \r | |
223 | //\r | |
224 | // Enable I/O and MMIO in PCI Bridge\r | |
225 | // Assume Root Bus Numer is Zero.\r | |
226 | //\r | |
227 | for (BusNumber = 0; (DeviceInfo + 1)->Device != 0xff; DeviceInfo++) {\r | |
228 | //\r | |
229 | // Compute PCI Lib Address to PCI to PCI Bridge\r | |
230 | //\r | |
231 | PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0);\r | |
232 | \r | |
233 | //\r | |
234 | // Retrieve and verify the bus numbers in the PCI to PCI Bridge\r | |
235 | //\r | |
236 | BusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET);\r | |
237 | SubordinateBusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SUBORDINATE_BUS_REGISTER_OFFSET);\r | |
238 | if (BusNumber == 0 || BusNumber > SubordinateBusNumber) {\r | |
239 | return 0;\r | |
240 | }\r | |
241 | \r | |
242 | //\r | |
243 | // Retrieve and verify the I/O or MMIO decode window in the PCI to PCI Bridge\r | |
244 | //\r | |
245 | if (PcdGetBool (PcdSerialUseMmio)) {\r | |
246 | MemoryLimit = PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.MemoryLimit)) & 0xfff0;\r | |
247 | MemoryBase = PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.MemoryBase)) & 0xfff0;\r | |
248 | \r | |
249 | //\r | |
250 | // If PCI Bridge MMIO window is disabled, then return 0\r | |
251 | //\r | |
252 | if (MemoryLimit < MemoryBase) {\r | |
253 | return 0;\r | |
254 | }\r | |
255 | \r | |
256 | //\r | |
257 | // If PCI Bridge MMIO window is not in the address range decoded by the parent PCI Bridge, then return 0\r | |
258 | //\r | |
259 | if (MemoryBase < ParentMemoryBase || MemoryBase > ParentMemoryLimit || MemoryLimit > ParentMemoryLimit) {\r | |
260 | return 0;\r | |
261 | }\r | |
262 | ParentMemoryBase = MemoryBase;\r | |
263 | ParentMemoryLimit = MemoryLimit;\r | |
264 | } else {\r | |
265 | IoLimit = PciRead8 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoLimit));\r | |
266 | if ((IoLimit & PCI_BRIDGE_32_BIT_IO_SPACE ) == 0) {\r | |
267 | IoLimit = IoLimit >> 4;\r | |
268 | } else {\r | |
269 | IoLimit = (PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoLimitUpper16)) << 4) | (IoLimit >> 4);\r | |
270 | }\r | |
271 | IoBase = PciRead8 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoBase));\r | |
272 | if ((IoBase & PCI_BRIDGE_32_BIT_IO_SPACE ) == 0) {\r | |
273 | IoBase = IoBase >> 4;\r | |
274 | } else {\r | |
275 | IoBase = (PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoBaseUpper16)) << 4) | (IoBase >> 4);\r | |
276 | }\r | |
277 | \r | |
278 | //\r | |
279 | // If PCI Bridge I/O window is disabled, then return 0\r | |
280 | //\r | |
281 | if (IoLimit < IoBase) {\r | |
282 | return 0;\r | |
283 | }\r | |
284 | \r | |
285 | //\r | |
286 | // If PCI Bridge I/O window is not in the address range decoded by the parent PCI Bridge, then return 0\r | |
287 | //\r | |
288 | if (IoBase < ParentIoBase || IoBase > ParentIoLimit || IoLimit > ParentIoLimit) {\r | |
289 | return 0;\r | |
290 | }\r | |
291 | ParentIoBase = IoBase;\r | |
292 | ParentIoLimit = IoLimit;\r | |
293 | }\r | |
294 | }\r | |
295 | \r | |
296 | //\r | |
297 | // Compute PCI Lib Address to PCI UART\r | |
298 | //\r | |
299 | PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0);\r | |
300 | \r | |
301 | //\r | |
302 | // Find the first IO or MMIO BAR\r | |
303 | //\r | |
304 | RegisterBaseMask = 0xFFFFFFF0;\r | |
305 | for (BarIndex = 0; BarIndex < PCI_MAX_BAR; BarIndex ++) {\r | |
306 | SerialRegisterBase = PciRead32 (PciLibAddress + PCI_BASE_ADDRESSREG_OFFSET + BarIndex * 4);\r | |
307 | if (PcdGetBool (PcdSerialUseMmio) && ((SerialRegisterBase & BIT0) == 0)) {\r | |
308 | //\r | |
309 | // MMIO BAR is found\r | |
310 | //\r | |
311 | RegisterBaseMask = 0xFFFFFFF0;\r | |
312 | break;\r | |
313 | }\r | |
314 | \r | |
315 | if ((!PcdGetBool (PcdSerialUseMmio)) && ((SerialRegisterBase & BIT0) != 0)) {\r | |
316 | //\r | |
317 | // IO BAR is found\r | |
318 | //\r | |
319 | RegisterBaseMask = 0xFFFFFFF8;\r | |
320 | break;\r | |
321 | }\r | |
322 | }\r | |
323 | \r | |
324 | //\r | |
325 | // MMIO or IO BAR is not found.\r | |
326 | //\r | |
327 | if (BarIndex == PCI_MAX_BAR) {\r | |
328 | return 0;\r | |
329 | }\r | |
330 | \r | |
331 | //\r | |
332 | // Program UART BAR\r | |
333 | //\r | |
334 | SerialRegisterBase = SerialPortLibUpdatePciRegister32 (\r | |
335 | PciLibAddress + PCI_BASE_ADDRESSREG_OFFSET + BarIndex * 4,\r | |
336 | (UINT32)PcdGet64 (PcdSerialRegisterBase),\r | |
337 | RegisterBaseMask\r | |
338 | );\r | |
339 | \r | |
340 | //\r | |
341 | // Verify that the UART BAR is in the address range decoded by the parent PCI Bridge\r | |
342 | //\r | |
343 | if (PcdGetBool (PcdSerialUseMmio)) {\r | |
344 | if (((SerialRegisterBase >> 16) & 0xfff0) < ParentMemoryBase || ((SerialRegisterBase >> 16) & 0xfff0) > ParentMemoryLimit) {\r | |
345 | return 0;\r | |
346 | }\r | |
347 | } else {\r | |
348 | if ((SerialRegisterBase >> 12) < ParentIoBase || (SerialRegisterBase >> 12) > ParentIoLimit) {\r | |
349 | return 0;\r | |
350 | }\r | |
351 | }\r | |
352 | \r | |
353 | //\r | |
354 | // Enable I/O and MMIO in PCI UART Device if they are not already enabled\r | |
355 | //\r | |
356 | PciOr16 (\r | |
357 | PciLibAddress + PCI_COMMAND_OFFSET,\r | |
358 | PcdGetBool (PcdSerialUseMmio) ? EFI_PCI_COMMAND_MEMORY_SPACE : EFI_PCI_COMMAND_IO_SPACE\r | |
359 | );\r | |
360 | \r | |
361 | //\r | |
362 | // Force D0 state if a Power Management and Status Register is specified\r | |
363 | //\r | |
364 | if (DeviceInfo->PowerManagementStatusAndControlRegister != 0x00) {\r | |
365 | if ((PciRead16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister) & (BIT0 | BIT1)) != 0x00) {\r | |
366 | PciAnd16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister, (UINT16)~(BIT0 | BIT1));\r | |
367 | //\r | |
368 | // If PCI UART was not in D0, then make sure FIFOs are enabled, but do not reset FIFOs\r | |
369 | //\r | |
370 | SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, (UINT8)(PcdGet8 (PcdSerialFifoControl) & (B_UART_FCR_FIFOE | B_UART_FCR_FIFO64)));\r | |
371 | }\r | |
372 | }\r | |
373 | \r | |
374 | //\r | |
375 | // Get PCI Device Info\r | |
376 | //\r | |
377 | DeviceInfo = (PCI_UART_DEVICE_INFO *) PcdGetPtr (PcdSerialPciDeviceInfo);\r | |
378 | \r | |
379 | //\r | |
380 | // Enable I/O or MMIO in PCI Bridge\r | |
381 | // Assume Root Bus Numer is Zero.\r | |
382 | //\r | |
383 | for (BusNumber = 0; (DeviceInfo + 1)->Device != 0xff; DeviceInfo++) {\r | |
384 | //\r | |
385 | // Compute PCI Lib Address to PCI to PCI Bridge\r | |
386 | //\r | |
387 | PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0);\r | |
388 | \r | |
389 | //\r | |
390 | // Enable the I/O or MMIO decode windows in the PCI to PCI Bridge\r | |
391 | //\r | |
392 | PciOr16 (\r | |
393 | PciLibAddress + PCI_COMMAND_OFFSET,\r | |
394 | PcdGetBool (PcdSerialUseMmio) ? EFI_PCI_COMMAND_MEMORY_SPACE : EFI_PCI_COMMAND_IO_SPACE\r | |
395 | );\r | |
396 | \r | |
397 | //\r | |
398 | // Force D0 state if a Power Management and Status Register is specified\r | |
399 | //\r | |
400 | if (DeviceInfo->PowerManagementStatusAndControlRegister != 0x00) {\r | |
401 | if ((PciRead16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister) & (BIT0 | BIT1)) != 0x00) {\r | |
402 | PciAnd16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister, (UINT16)~(BIT0 | BIT1));\r | |
403 | }\r | |
404 | }\r | |
405 | \r | |
406 | BusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET);\r | |
407 | }\r | |
408 | \r | |
409 | return SerialRegisterBase;\r | |
410 | }\r | |
411 | \r | |
412 | /**\r | |
413 | Return whether the hardware flow control signal allows writing.\r | |
414 | \r | |
415 | @param SerialRegisterBase The base address register of UART device.\r | |
416 | \r | |
417 | @retval TRUE The serial port is writable.\r | |
418 | @retval FALSE The serial port is not writable.\r | |
419 | **/\r | |
420 | BOOLEAN\r | |
421 | SerialPortWritable (\r | |
422 | UINTN SerialRegisterBase\r | |
423 | )\r | |
424 | {\r | |
425 | if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {\r | |
426 | if (PcdGetBool (PcdSerialDetectCable)) {\r | |
427 | //\r | |
428 | // Wait for both DSR and CTS to be set\r | |
429 | // DSR is set if a cable is connected.\r | |
430 | // CTS is set if it is ok to transmit data\r | |
431 | //\r | |
432 | // DSR CTS Description Action\r | |
433 | // === === ======================================== ========\r | |
434 | // 0 0 No cable connected. Wait\r | |
435 | // 0 1 No cable connected. Wait\r | |
436 | // 1 0 Cable connected, but not clear to send. Wait\r | |
437 | // 1 1 Cable connected, and clear to send. Transmit\r | |
438 | //\r | |
439 | return (BOOLEAN) ((SerialPortReadRegister (SerialRegisterBase, R_UART_MSR) & (B_UART_MSR_DSR | B_UART_MSR_CTS)) == (B_UART_MSR_DSR | B_UART_MSR_CTS));\r | |
440 | } else {\r | |
441 | //\r | |
442 | // Wait for both DSR and CTS to be set OR for DSR to be clear.\r | |
443 | // DSR is set if a cable is connected.\r | |
444 | // CTS is set if it is ok to transmit data\r | |
445 | //\r | |
446 | // DSR CTS Description Action\r | |
447 | // === === ======================================== ========\r | |
448 | // 0 0 No cable connected. Transmit\r | |
449 | // 0 1 No cable connected. Transmit\r | |
450 | // 1 0 Cable connected, but not clear to send. Wait\r | |
451 | // 1 1 Cable connected, and clar to send. Transmit\r | |
452 | //\r | |
453 | return (BOOLEAN) ((SerialPortReadRegister (SerialRegisterBase, R_UART_MSR) & (B_UART_MSR_DSR | B_UART_MSR_CTS)) != (B_UART_MSR_DSR));\r | |
454 | }\r | |
455 | }\r | |
456 | \r | |
457 | return TRUE;\r | |
458 | }\r | |
459 | \r | |
460 | /**\r | |
461 | Initialize the serial device hardware.\r | |
462 | \r | |
463 | If no initialization is required, then return RETURN_SUCCESS.\r | |
464 | If the serial device was successfully initialized, then return RETURN_SUCCESS.\r | |
465 | If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.\r | |
466 | \r | |
467 | @retval RETURN_SUCCESS The serial device was initialized.\r | |
468 | @retval RETURN_DEVICE_ERROR The serial device could not be initialized.\r | |
469 | \r | |
470 | **/\r | |
471 | RETURN_STATUS\r | |
472 | EFIAPI\r | |
473 | SerialPortInitialize (\r | |
474 | VOID\r | |
475 | )\r | |
476 | {\r | |
477 | RETURN_STATUS Status;\r | |
478 | UINTN SerialRegisterBase;\r | |
479 | UINT32 Divisor;\r | |
480 | UINT32 CurrentDivisor;\r | |
481 | BOOLEAN Initialized;\r | |
482 | \r | |
483 | //\r | |
484 | // Perform platform specific initialization required to enable use of the 16550 device\r | |
485 | // at the location specified by PcdSerialUseMmio and PcdSerialRegisterBase.\r | |
486 | //\r | |
487 | Status = PlatformHookSerialPortInitialize ();\r | |
488 | if (RETURN_ERROR (Status)) {\r | |
489 | return Status;\r | |
490 | }\r | |
491 | \r | |
492 | //\r | |
493 | // Calculate divisor for baud generator\r | |
494 | // Ref_Clk_Rate / Baud_Rate / 16\r | |
495 | //\r | |
496 | Divisor = PcdGet32 (PcdSerialClockRate) / (PcdGet32 (PcdSerialBaudRate) * 16);\r | |
497 | if ((PcdGet32 (PcdSerialClockRate) % (PcdGet32 (PcdSerialBaudRate) * 16)) >= PcdGet32 (PcdSerialBaudRate) * 8) {\r | |
498 | Divisor++;\r | |
499 | }\r | |
500 | \r | |
501 | //\r | |
502 | // Get the base address of the serial port in either I/O or MMIO space\r | |
503 | //\r | |
504 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
505 | if (SerialRegisterBase ==0) {\r | |
506 | return RETURN_DEVICE_ERROR;\r | |
507 | }\r | |
508 | \r | |
509 | //\r | |
510 | // See if the serial port is already initialized\r | |
511 | //\r | |
512 | Initialized = TRUE;\r | |
513 | if ((SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) & 0x3F) != (PcdGet8 (PcdSerialLineControl) & 0x3F)) {\r | |
514 | Initialized = FALSE;\r | |
515 | }\r | |
516 | SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) | B_UART_LCR_DLAB));\r | |
517 | CurrentDivisor = SerialPortReadRegister (SerialRegisterBase, R_UART_BAUD_HIGH) << 8;\r | |
518 | CurrentDivisor |= (UINT32) SerialPortReadRegister (SerialRegisterBase, R_UART_BAUD_LOW);\r | |
519 | SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) & ~B_UART_LCR_DLAB));\r | |
520 | if (CurrentDivisor != Divisor) {\r | |
521 | Initialized = FALSE;\r | |
522 | }\r | |
523 | if (Initialized) {\r | |
524 | return RETURN_SUCCESS;\r | |
525 | }\r | |
526 | \r | |
527 | //\r | |
528 | // Wait for the serial port to be ready.\r | |
529 | // Verify that both the transmit FIFO and the shift register are empty.\r | |
530 | //\r | |
531 | while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY));\r | |
532 | \r | |
533 | //\r | |
534 | // Configure baud rate\r | |
535 | //\r | |
536 | SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB);\r | |
537 | SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8) (Divisor >> 8));\r | |
538 | SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8) (Divisor & 0xff));\r | |
539 | \r | |
540 | //\r | |
541 | // Clear DLAB and configure Data Bits, Parity, and Stop Bits.\r | |
542 | // Strip reserved bits from PcdSerialLineControl\r | |
543 | //\r | |
544 | SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(PcdGet8 (PcdSerialLineControl) & 0x3F));\r | |
545 | \r | |
546 | //\r | |
547 | // Enable and reset FIFOs\r | |
548 | // Strip reserved bits from PcdSerialFifoControl\r | |
549 | //\r | |
550 | SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, 0x00);\r | |
551 | SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, (UINT8)(PcdGet8 (PcdSerialFifoControl) & (B_UART_FCR_FIFOE | B_UART_FCR_FIFO64)));\r | |
552 | \r | |
553 | //\r | |
554 | // Set FIFO Polled Mode by clearing IER after setting FCR\r | |
555 | //\r | |
556 | SerialPortWriteRegister (SerialRegisterBase, R_UART_IER, 0x00);\r | |
557 | \r | |
558 | //\r | |
559 | // Put Modem Control Register(MCR) into its reset state of 0x00.\r | |
560 | //\r | |
561 | SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, 0x00);\r | |
562 | \r | |
563 | return RETURN_SUCCESS;\r | |
564 | }\r | |
565 | \r | |
566 | /**\r | |
567 | Write data from buffer to serial device.\r | |
568 | \r | |
569 | Writes NumberOfBytes data bytes from Buffer to the serial device.\r | |
570 | The number of bytes actually written to the serial device is returned.\r | |
571 | If the return value is less than NumberOfBytes, then the write operation failed.\r | |
572 | \r | |
573 | If Buffer is NULL, then ASSERT().\r | |
574 | \r | |
575 | If NumberOfBytes is zero, then return 0.\r | |
576 | \r | |
577 | @param Buffer Pointer to the data buffer to be written.\r | |
578 | @param NumberOfBytes Number of bytes to written to the serial device.\r | |
579 | \r | |
580 | @retval 0 NumberOfBytes is 0.\r | |
581 | @retval >0 The number of bytes written to the serial device.\r | |
582 | If this value is less than NumberOfBytes, then the write operation failed.\r | |
583 | \r | |
584 | **/\r | |
585 | UINTN\r | |
586 | EFIAPI\r | |
587 | SerialPortWrite (\r | |
588 | IN UINT8 *Buffer,\r | |
589 | IN UINTN NumberOfBytes\r | |
590 | )\r | |
591 | {\r | |
592 | UINTN SerialRegisterBase;\r | |
593 | UINTN Result;\r | |
594 | UINTN Index;\r | |
595 | UINTN FifoSize;\r | |
596 | \r | |
597 | if (Buffer == NULL) {\r | |
598 | return 0;\r | |
599 | }\r | |
600 | \r | |
601 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
602 | if (SerialRegisterBase ==0) {\r | |
603 | return 0;\r | |
604 | }\r | |
605 | \r | |
606 | if (NumberOfBytes == 0) {\r | |
607 | //\r | |
608 | // Flush the hardware\r | |
609 | //\r | |
610 | \r | |
611 | //\r | |
612 | // Wait for both the transmit FIFO and shift register empty.\r | |
613 | //\r | |
614 | while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY));\r | |
615 | \r | |
616 | //\r | |
617 | // Wait for the hardware flow control signal\r | |
618 | //\r | |
619 | while (!SerialPortWritable (SerialRegisterBase));\r | |
620 | return 0;\r | |
621 | }\r | |
622 | \r | |
623 | //\r | |
624 | // Compute the maximum size of the Tx FIFO\r | |
625 | //\r | |
626 | FifoSize = 1;\r | |
627 | if ((PcdGet8 (PcdSerialFifoControl) & B_UART_FCR_FIFOE) != 0) {\r | |
628 | if ((PcdGet8 (PcdSerialFifoControl) & B_UART_FCR_FIFO64) == 0) {\r | |
629 | FifoSize = 16;\r | |
630 | } else {\r | |
631 | FifoSize = PcdGet32 (PcdSerialExtendedTxFifoSize);\r | |
632 | }\r | |
633 | }\r | |
634 | \r | |
635 | Result = NumberOfBytes;\r | |
636 | while (NumberOfBytes != 0) {\r | |
637 | //\r | |
638 | // Wait for the serial port to be ready, to make sure both the transmit FIFO\r | |
639 | // and shift register empty.\r | |
640 | //\r | |
641 | while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_TEMT) == 0);\r | |
642 | \r | |
643 | //\r | |
644 | // Fill then entire Tx FIFO\r | |
645 | //\r | |
646 | for (Index = 0; Index < FifoSize && NumberOfBytes != 0; Index++, NumberOfBytes--, Buffer++) {\r | |
647 | //\r | |
648 | // Wait for the hardware flow control signal\r | |
649 | //\r | |
650 | while (!SerialPortWritable (SerialRegisterBase));\r | |
651 | \r | |
652 | //\r | |
653 | // Write byte to the transmit buffer.\r | |
654 | //\r | |
655 | SerialPortWriteRegister (SerialRegisterBase, R_UART_TXBUF, *Buffer);\r | |
656 | }\r | |
657 | }\r | |
658 | return Result;\r | |
659 | }\r | |
660 | \r | |
661 | /**\r | |
662 | Reads data from a serial device into a buffer.\r | |
663 | \r | |
664 | @param Buffer Pointer to the data buffer to store the data read from the serial device.\r | |
665 | @param NumberOfBytes Number of bytes to read from the serial device.\r | |
666 | \r | |
667 | @retval 0 NumberOfBytes is 0.\r | |
668 | @retval >0 The number of bytes read from the serial device.\r | |
669 | If this value is less than NumberOfBytes, then the read operation failed.\r | |
670 | \r | |
671 | **/\r | |
672 | UINTN\r | |
673 | EFIAPI\r | |
674 | SerialPortRead (\r | |
675 | OUT UINT8 *Buffer,\r | |
676 | IN UINTN NumberOfBytes\r | |
677 | )\r | |
678 | {\r | |
679 | UINTN SerialRegisterBase;\r | |
680 | UINTN Result;\r | |
681 | UINT8 Mcr;\r | |
682 | \r | |
683 | if (NULL == Buffer) {\r | |
684 | return 0;\r | |
685 | }\r | |
686 | \r | |
687 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
688 | if (SerialRegisterBase ==0) {\r | |
689 | return 0;\r | |
690 | }\r | |
691 | \r | |
692 | Mcr = (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) & ~B_UART_MCR_RTS);\r | |
693 | \r | |
694 | for (Result = 0; NumberOfBytes-- != 0; Result++, Buffer++) {\r | |
695 | //\r | |
696 | // Wait for the serial port to have some data.\r | |
697 | //\r | |
698 | while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_RXRDY) == 0) {\r | |
699 | if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {\r | |
700 | //\r | |
701 | // Set RTS to let the peer send some data\r | |
702 | //\r | |
703 | SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(Mcr | B_UART_MCR_RTS));\r | |
704 | }\r | |
705 | }\r | |
706 | if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {\r | |
707 | //\r | |
708 | // Clear RTS to prevent peer from sending data\r | |
709 | //\r | |
710 | SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr);\r | |
711 | }\r | |
712 | \r | |
713 | //\r | |
714 | // Read byte from the receive buffer.\r | |
715 | //\r | |
716 | *Buffer = SerialPortReadRegister (SerialRegisterBase, R_UART_RXBUF);\r | |
717 | }\r | |
718 | \r | |
719 | return Result;\r | |
720 | }\r | |
721 | \r | |
722 | \r | |
723 | /**\r | |
724 | Polls a serial device to see if there is any data waiting to be read.\r | |
725 | \r | |
726 | Polls aserial device to see if there is any data waiting to be read.\r | |
727 | If there is data waiting to be read from the serial device, then TRUE is returned.\r | |
728 | If there is no data waiting to be read from the serial device, then FALSE is returned.\r | |
729 | \r | |
730 | @retval TRUE Data is waiting to be read from the serial device.\r | |
731 | @retval FALSE There is no data waiting to be read from the serial device.\r | |
732 | \r | |
733 | **/\r | |
734 | BOOLEAN\r | |
735 | EFIAPI\r | |
736 | SerialPortPoll (\r | |
737 | VOID\r | |
738 | )\r | |
739 | {\r | |
740 | UINTN SerialRegisterBase;\r | |
741 | \r | |
742 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
743 | if (SerialRegisterBase ==0) {\r | |
744 | return FALSE;\r | |
745 | }\r | |
746 | \r | |
747 | //\r | |
748 | // Read the serial port status\r | |
749 | //\r | |
750 | if ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_RXRDY) != 0) {\r | |
751 | if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {\r | |
752 | //\r | |
753 | // Clear RTS to prevent peer from sending data\r | |
754 | //\r | |
755 | SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) & ~B_UART_MCR_RTS));\r | |
756 | }\r | |
757 | return TRUE;\r | |
758 | }\r | |
759 | \r | |
760 | if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {\r | |
761 | //\r | |
762 | // Set RTS to let the peer send some data\r | |
763 | //\r | |
764 | SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) | B_UART_MCR_RTS));\r | |
765 | }\r | |
766 | \r | |
767 | return FALSE;\r | |
768 | }\r | |
769 | \r | |
770 | /**\r | |
771 | Sets the control bits on a serial device.\r | |
772 | \r | |
773 | @param Control Sets the bits of Control that are settable.\r | |
774 | \r | |
775 | @retval RETURN_SUCCESS The new control bits were set on the serial device.\r | |
776 | @retval RETURN_UNSUPPORTED The serial device does not support this operation.\r | |
777 | @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.\r | |
778 | \r | |
779 | **/\r | |
780 | RETURN_STATUS\r | |
781 | EFIAPI\r | |
782 | SerialPortSetControl (\r | |
783 | IN UINT32 Control\r | |
784 | )\r | |
785 | {\r | |
786 | UINTN SerialRegisterBase;\r | |
787 | UINT8 Mcr;\r | |
788 | \r | |
789 | //\r | |
790 | // First determine the parameter is invalid.\r | |
791 | //\r | |
792 | if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND | EFI_SERIAL_DATA_TERMINAL_READY |\r | |
793 | EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE))) != 0) {\r | |
794 | return RETURN_UNSUPPORTED;\r | |
795 | }\r | |
796 | \r | |
797 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
798 | if (SerialRegisterBase ==0) {\r | |
799 | return RETURN_UNSUPPORTED;\r | |
800 | }\r | |
801 | \r | |
802 | //\r | |
803 | // Read the Modem Control Register.\r | |
804 | //\r | |
805 | Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR);\r | |
806 | Mcr &= (~(B_UART_MCR_DTRC | B_UART_MCR_RTS));\r | |
807 | \r | |
808 | if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) == EFI_SERIAL_DATA_TERMINAL_READY) {\r | |
809 | Mcr |= B_UART_MCR_DTRC;\r | |
810 | }\r | |
811 | \r | |
812 | if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) {\r | |
813 | Mcr |= B_UART_MCR_RTS;\r | |
814 | }\r | |
815 | \r | |
816 | //\r | |
817 | // Write the Modem Control Register.\r | |
818 | //\r | |
819 | SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr);\r | |
820 | \r | |
821 | return RETURN_SUCCESS;\r | |
822 | }\r | |
823 | \r | |
824 | /**\r | |
825 | Retrieve the status of the control bits on a serial device.\r | |
826 | \r | |
827 | @param Control A pointer to return the current control signals from the serial device.\r | |
828 | \r | |
829 | @retval RETURN_SUCCESS The control bits were read from the serial device.\r | |
830 | @retval RETURN_UNSUPPORTED The serial device does not support this operation.\r | |
831 | @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.\r | |
832 | \r | |
833 | **/\r | |
834 | RETURN_STATUS\r | |
835 | EFIAPI\r | |
836 | SerialPortGetControl (\r | |
837 | OUT UINT32 *Control\r | |
838 | )\r | |
839 | {\r | |
840 | UINTN SerialRegisterBase;\r | |
841 | UINT8 Msr;\r | |
842 | UINT8 Mcr;\r | |
843 | UINT8 Lsr;\r | |
844 | \r | |
845 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
846 | if (SerialRegisterBase ==0) {\r | |
847 | return RETURN_UNSUPPORTED;\r | |
848 | }\r | |
849 | \r | |
850 | *Control = 0;\r | |
851 | \r | |
852 | //\r | |
853 | // Read the Modem Status Register.\r | |
854 | //\r | |
855 | Msr = SerialPortReadRegister (SerialRegisterBase, R_UART_MSR);\r | |
856 | \r | |
857 | if ((Msr & B_UART_MSR_CTS) == B_UART_MSR_CTS) {\r | |
858 | *Control |= EFI_SERIAL_CLEAR_TO_SEND;\r | |
859 | }\r | |
860 | \r | |
861 | if ((Msr & B_UART_MSR_DSR) == B_UART_MSR_DSR) {\r | |
862 | *Control |= EFI_SERIAL_DATA_SET_READY;\r | |
863 | }\r | |
864 | \r | |
865 | if ((Msr & B_UART_MSR_RI) == B_UART_MSR_RI) {\r | |
866 | *Control |= EFI_SERIAL_RING_INDICATE;\r | |
867 | }\r | |
868 | \r | |
869 | if ((Msr & B_UART_MSR_DCD) == B_UART_MSR_DCD) {\r | |
870 | *Control |= EFI_SERIAL_CARRIER_DETECT;\r | |
871 | }\r | |
872 | \r | |
873 | //\r | |
874 | // Read the Modem Control Register.\r | |
875 | //\r | |
876 | Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR);\r | |
877 | \r | |
878 | if ((Mcr & B_UART_MCR_DTRC) == B_UART_MCR_DTRC) {\r | |
879 | *Control |= EFI_SERIAL_DATA_TERMINAL_READY;\r | |
880 | }\r | |
881 | \r | |
882 | if ((Mcr & B_UART_MCR_RTS) == B_UART_MCR_RTS) {\r | |
883 | *Control |= EFI_SERIAL_REQUEST_TO_SEND;\r | |
884 | }\r | |
885 | \r | |
886 | if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {\r | |
887 | *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;\r | |
888 | }\r | |
889 | \r | |
890 | //\r | |
891 | // Read the Line Status Register.\r | |
892 | //\r | |
893 | Lsr = SerialPortReadRegister (SerialRegisterBase, R_UART_LSR);\r | |
894 | \r | |
895 | if ((Lsr & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) == (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) {\r | |
896 | *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;\r | |
897 | }\r | |
898 | \r | |
899 | if ((Lsr & B_UART_LSR_RXRDY) == 0) {\r | |
900 | *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;\r | |
901 | }\r | |
902 | \r | |
903 | return RETURN_SUCCESS;\r | |
904 | }\r | |
905 | \r | |
906 | /**\r | |
907 | Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,\r | |
908 | data bits, and stop bits on a serial device.\r | |
909 | \r | |
910 | @param BaudRate The requested baud rate. A BaudRate value of 0 will use the\r | |
911 | device's default interface speed.\r | |
912 | On output, the value actually set.\r | |
913 | @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the\r | |
914 | serial interface. A ReceiveFifoDepth value of 0 will use\r | |
915 | the device's default FIFO depth.\r | |
916 | On output, the value actually set.\r | |
917 | @param Timeout The requested time out for a single character in microseconds.\r | |
918 | This timeout applies to both the transmit and receive side of the\r | |
919 | interface. A Timeout value of 0 will use the device's default time\r | |
920 | out value.\r | |
921 | On output, the value actually set.\r | |
922 | @param Parity The type of parity to use on this serial device. A Parity value of\r | |
923 | DefaultParity will use the device's default parity value.\r | |
924 | On output, the value actually set.\r | |
925 | @param DataBits The number of data bits to use on the serial device. A DataBits\r | |
926 | vaule of 0 will use the device's default data bit setting.\r | |
927 | On output, the value actually set.\r | |
928 | @param StopBits The number of stop bits to use on this serial device. A StopBits\r | |
929 | value of DefaultStopBits will use the device's default number of\r | |
930 | stop bits.\r | |
931 | On output, the value actually set.\r | |
932 | \r | |
933 | @retval RETURN_SUCCESS The new attributes were set on the serial device.\r | |
934 | @retval RETURN_UNSUPPORTED The serial device does not support this operation.\r | |
935 | @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.\r | |
936 | @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.\r | |
937 | \r | |
938 | **/\r | |
939 | RETURN_STATUS\r | |
940 | EFIAPI\r | |
941 | SerialPortSetAttributes (\r | |
942 | IN OUT UINT64 *BaudRate,\r | |
943 | IN OUT UINT32 *ReceiveFifoDepth,\r | |
944 | IN OUT UINT32 *Timeout,\r | |
945 | IN OUT EFI_PARITY_TYPE *Parity,\r | |
946 | IN OUT UINT8 *DataBits,\r | |
947 | IN OUT EFI_STOP_BITS_TYPE *StopBits\r | |
948 | )\r | |
949 | {\r | |
950 | UINTN SerialRegisterBase;\r | |
951 | UINT32 SerialBaudRate;\r | |
952 | UINTN Divisor;\r | |
953 | UINT8 Lcr;\r | |
954 | UINT8 LcrData;\r | |
955 | UINT8 LcrParity;\r | |
956 | UINT8 LcrStop;\r | |
957 | \r | |
958 | SerialRegisterBase = GetSerialRegisterBase ();\r | |
959 | if (SerialRegisterBase ==0) {\r | |
960 | return RETURN_UNSUPPORTED;\r | |
961 | }\r | |
962 | \r | |
963 | //\r | |
964 | // Check for default settings and fill in actual values.\r | |
965 | //\r | |
966 | if (*BaudRate == 0) {\r | |
967 | *BaudRate = PcdGet32 (PcdSerialBaudRate);\r | |
968 | }\r | |
969 | SerialBaudRate = (UINT32) *BaudRate;\r | |
970 | \r | |
971 | if (*DataBits == 0) {\r | |
972 | LcrData = (UINT8) (PcdGet8 (PcdSerialLineControl) & 0x3);\r | |
973 | *DataBits = LcrData + 5;\r | |
974 | } else {\r | |
975 | if ((*DataBits < 5) || (*DataBits > 8)) {\r | |
976 | return RETURN_INVALID_PARAMETER;\r | |
977 | }\r | |
978 | //\r | |
979 | // Map 5..8 to 0..3\r | |
980 | //\r | |
981 | LcrData = (UINT8) (*DataBits - (UINT8) 5);\r | |
982 | }\r | |
983 | \r | |
984 | if (*Parity == DefaultParity) {\r | |
985 | LcrParity = (UINT8) ((PcdGet8 (PcdSerialLineControl) >> 3) & 0x7);\r | |
986 | switch (LcrParity) {\r | |
987 | case 0:\r | |
988 | *Parity = NoParity;\r | |
989 | break;\r | |
990 | \r | |
991 | case 3:\r | |
992 | *Parity = EvenParity;\r | |
993 | break;\r | |
994 | \r | |
995 | case 1:\r | |
996 | *Parity = OddParity;\r | |
997 | break;\r | |
998 | \r | |
999 | case 7:\r | |
1000 | *Parity = SpaceParity;\r | |
1001 | break;\r | |
1002 | \r | |
1003 | case 5:\r | |
1004 | *Parity = MarkParity;\r | |
1005 | break;\r | |
1006 | \r | |
1007 | default:\r | |
1008 | break;\r | |
1009 | }\r | |
1010 | } else {\r | |
1011 | switch (*Parity) {\r | |
1012 | case NoParity:\r | |
1013 | LcrParity = 0;\r | |
1014 | break;\r | |
1015 | \r | |
1016 | case EvenParity:\r | |
1017 | LcrParity = 3;\r | |
1018 | break;\r | |
1019 | \r | |
1020 | case OddParity:\r | |
1021 | LcrParity = 1;\r | |
1022 | break;\r | |
1023 | \r | |
1024 | case SpaceParity:\r | |
1025 | LcrParity = 7;\r | |
1026 | break;\r | |
1027 | \r | |
1028 | case MarkParity:\r | |
1029 | LcrParity = 5;\r | |
1030 | break;\r | |
1031 | \r | |
1032 | default:\r | |
1033 | return RETURN_INVALID_PARAMETER;\r | |
1034 | }\r | |
1035 | }\r | |
1036 | \r | |
1037 | if (*StopBits == DefaultStopBits) {\r | |
1038 | LcrStop = (UINT8) ((PcdGet8 (PcdSerialLineControl) >> 2) & 0x1);\r | |
1039 | switch (LcrStop) {\r | |
1040 | case 0:\r | |
1041 | *StopBits = OneStopBit;\r | |
1042 | break;\r | |
1043 | \r | |
1044 | case 1:\r | |
1045 | if (*DataBits == 5) {\r | |
1046 | *StopBits = OneFiveStopBits;\r | |
1047 | } else {\r | |
1048 | *StopBits = TwoStopBits;\r | |
1049 | }\r | |
1050 | break;\r | |
1051 | \r | |
1052 | default:\r | |
1053 | break;\r | |
1054 | }\r | |
1055 | } else {\r | |
1056 | switch (*StopBits) {\r | |
1057 | case OneStopBit:\r | |
1058 | LcrStop = 0;\r | |
1059 | break;\r | |
1060 | \r | |
1061 | case OneFiveStopBits:\r | |
1062 | case TwoStopBits:\r | |
1063 | LcrStop = 1;\r | |
1064 | break;\r | |
1065 | \r | |
1066 | default:\r | |
1067 | return RETURN_INVALID_PARAMETER;\r | |
1068 | }\r | |
1069 | }\r | |
1070 | \r | |
1071 | //\r | |
1072 | // Calculate divisor for baud generator\r | |
1073 | // Ref_Clk_Rate / Baud_Rate / 16\r | |
1074 | //\r | |
1075 | Divisor = PcdGet32 (PcdSerialClockRate) / (SerialBaudRate * 16);\r | |
1076 | if ((PcdGet32 (PcdSerialClockRate) % (SerialBaudRate * 16)) >= SerialBaudRate * 8) {\r | |
1077 | Divisor++;\r | |
1078 | }\r | |
1079 | \r | |
1080 | //\r | |
1081 | // Configure baud rate\r | |
1082 | //\r | |
1083 | SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB);\r | |
1084 | SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8) (Divisor >> 8));\r | |
1085 | SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8) (Divisor & 0xff));\r | |
1086 | \r | |
1087 | //\r | |
1088 | // Clear DLAB and configure Data Bits, Parity, and Stop Bits.\r | |
1089 | // Strip reserved bits from line control value\r | |
1090 | //\r | |
1091 | Lcr = (UINT8) ((LcrParity << 3) | (LcrStop << 2) | LcrData);\r | |
1092 | SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8) (Lcr & 0x3F));\r | |
1093 | \r | |
1094 | return RETURN_SUCCESS;\r | |
1095 | }\r | |
1096 | \r |