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1e57a462 | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
3402aac7 | 4 | \r |
1e57a462 | 5 | This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <Uefi.h>\r | |
16 | #include <Omap3530/Omap3530.h>\r | |
17 | \r | |
18 | #include <Library/DebugLib.h>\r | |
19 | #include <Library/IoLib.h>\r | |
20 | #include <Library/UefiBootServicesTableLib.h>\r | |
21 | \r | |
22 | #include <Protocol/SmbusHc.h>\r | |
23 | \r | |
24 | #define MAX_RETRY 1000\r | |
25 | \r | |
26 | //\r | |
27 | // Internal Functions\r | |
28 | //\r | |
29 | STATIC\r | |
30 | EFI_STATUS\r | |
31 | WaitForBusBusy (\r | |
32 | VOID\r | |
33 | )\r | |
34 | {\r | |
35 | UINTN Retry = 0;\r | |
36 | \r | |
37 | while (++Retry < MAX_RETRY && (MmioRead16(I2C_STAT) & BB) == 0x1);\r | |
38 | \r | |
39 | if (Retry == MAX_RETRY) {\r | |
40 | return EFI_TIMEOUT;\r | |
41 | }\r | |
42 | \r | |
43 | return EFI_SUCCESS;\r | |
44 | }\r | |
45 | \r | |
46 | STATIC\r | |
47 | EFI_STATUS\r | |
48 | PollForStatus(\r | |
49 | UINT16 StatusBit\r | |
50 | )\r | |
51 | {\r | |
52 | UINTN Retry = 0;\r | |
53 | \r | |
54 | while(Retry < MAX_RETRY) {\r | |
55 | if (MmioRead16(I2C_STAT) & StatusBit) {\r | |
56 | //Clear particular status bit from Status register.\r | |
57 | MmioOr16(I2C_STAT, StatusBit);\r | |
58 | break;\r | |
59 | }\r | |
60 | Retry++;\r | |
61 | }\r | |
62 | \r | |
63 | if (Retry == MAX_RETRY) {\r | |
64 | return EFI_TIMEOUT;\r | |
65 | }\r | |
66 | \r | |
67 | return EFI_SUCCESS;\r | |
68 | }\r | |
69 | \r | |
70 | STATIC\r | |
71 | EFI_STATUS\r | |
72 | ConfigureI2c (\r | |
73 | VOID\r | |
74 | )\r | |
75 | {\r | |
76 | //Program prescaler to obtain 12-MHz clock\r | |
77 | MmioWrite16(I2C_PSC, 0x0000);\r | |
78 | \r | |
3402aac7 RC |
79 | //Program SCLL and SCLH\r |
80 | //NOTE: Following values are the register dump after U-Boot code executed.\r | |
1e57a462 | 81 | //We need to figure out how its calculated based on the I2C functional clock and I2C_PSC.\r |
82 | MmioWrite16(I2C_SCLL, 0x0035);\r | |
83 | MmioWrite16(I2C_SCLH, 0x0035);\r | |
84 | \r | |
85 | //Take the I2C controller out of reset.\r | |
86 | MmioOr16(I2C_CON, I2C_EN);\r | |
87 | \r | |
88 | //Initialize the I2C controller.\r | |
89 | \r | |
90 | //Set I2C controller in Master mode.\r | |
91 | MmioOr16(I2C_CON, MST);\r | |
92 | \r | |
93 | //Enable interrupts for receive/transmit mode.\r | |
94 | MmioOr16(I2C_IE, (XRDY_IE | RRDY_IE | ARDY_IE | NACK_IE));\r | |
95 | \r | |
96 | return EFI_SUCCESS;\r | |
97 | }\r | |
98 | \r | |
99 | STATIC\r | |
100 | EFI_STATUS\r | |
101 | I2CReadOneByte (\r | |
102 | UINT8 *Data\r | |
103 | )\r | |
104 | {\r | |
105 | EFI_STATUS Status;\r | |
106 | \r | |
107 | //I2C bus status checking\r | |
108 | Status = WaitForBusBusy();\r | |
109 | if (EFI_ERROR(Status)) {\r | |
110 | return Status;\r | |
111 | }\r | |
112 | \r | |
113 | //Poll till Receive ready bit is set.\r | |
114 | Status = PollForStatus(RRDY);\r | |
115 | if (EFI_ERROR(Status)) {\r | |
116 | return Status;\r | |
117 | }\r | |
118 | \r | |
119 | *Data = MmioRead8(I2C_DATA);\r | |
120 | \r | |
121 | return EFI_SUCCESS;\r | |
122 | }\r | |
123 | \r | |
124 | STATIC\r | |
125 | EFI_STATUS\r | |
126 | I2CWriteOneByte (\r | |
3402aac7 | 127 | UINT8 Data\r |
1e57a462 | 128 | )\r |
129 | {\r | |
130 | EFI_STATUS Status;\r | |
131 | \r | |
132 | //I2C bus status checking\r | |
133 | Status = WaitForBusBusy();\r | |
134 | if (EFI_ERROR(Status)) {\r | |
135 | return Status;\r | |
136 | }\r | |
137 | \r | |
138 | //Data transfer\r | |
139 | //Poll till Transmit ready bit is set\r | |
140 | Status = PollForStatus(XRDY);\r | |
141 | if (EFI_ERROR(Status)) {\r | |
142 | return Status;\r | |
143 | }\r | |
144 | \r | |
145 | MmioWrite8(I2C_DATA, Data);\r | |
146 | \r | |
147 | //Wait and check if the NACK is not set.\r | |
148 | gBS->Stall(1000);\r | |
149 | if (MmioRead16(I2C_STAT) & NACK) {\r | |
150 | return EFI_DEVICE_ERROR;\r | |
151 | }\r | |
152 | \r | |
153 | return EFI_SUCCESS;\r | |
154 | }\r | |
155 | \r | |
156 | STATIC\r | |
157 | EFI_STATUS\r | |
158 | SmbusBlockRead (\r | |
159 | OUT UINT8 *Buffer,\r | |
160 | IN UINTN Length\r | |
161 | )\r | |
162 | {\r | |
163 | UINTN Index = 0;\r | |
164 | EFI_STATUS Status = EFI_SUCCESS;\r | |
165 | \r | |
166 | //Transfer configuration for receiving data.\r | |
167 | MmioWrite16(I2C_CNT, Length);\r | |
168 | //Need stop bit before sending data.\r | |
169 | MmioWrite16(I2C_CON, (I2C_EN | MST | STP | STT));\r | |
170 | \r | |
171 | while (Index < Length) {\r | |
172 | //Read a byte\r | |
173 | Status = I2CReadOneByte(&Buffer[Index++]);\r | |
174 | if (EFI_ERROR(Status)) {\r | |
175 | return Status;\r | |
176 | }\r | |
177 | }\r | |
178 | \r | |
179 | //Transfer completion\r | |
180 | Status = PollForStatus(ARDY);\r | |
181 | if (EFI_ERROR(Status)) {\r | |
182 | return Status;\r | |
183 | }\r | |
184 | \r | |
185 | return Status;\r | |
186 | }\r | |
187 | \r | |
188 | STATIC\r | |
189 | EFI_STATUS\r | |
190 | SmbusBlockWrite (\r | |
191 | IN UINT8 *Buffer,\r | |
192 | IN UINTN Length\r | |
193 | )\r | |
194 | {\r | |
195 | UINTN Index = 0;\r | |
196 | EFI_STATUS Status = EFI_SUCCESS;\r | |
197 | \r | |
198 | //Transfer configuration for transmitting data\r | |
199 | MmioWrite16(I2C_CNT, Length);\r | |
200 | MmioWrite16(I2C_CON, (I2C_EN | TRX | MST | STT | STP));\r | |
201 | \r | |
202 | while (Index < Length) {\r | |
203 | //Send a byte\r | |
204 | Status = I2CWriteOneByte(Buffer[Index++]);\r | |
205 | if (EFI_ERROR(Status)) {\r | |
206 | return Status;\r | |
207 | }\r | |
208 | }\r | |
209 | \r | |
210 | //Transfer completion\r | |
211 | Status = PollForStatus(ARDY);\r | |
212 | if (EFI_ERROR(Status)) {\r | |
213 | return Status;\r | |
214 | }\r | |
215 | \r | |
216 | return Status;\r | |
217 | }\r | |
218 | \r | |
219 | //\r | |
220 | // Public Functions.\r | |
221 | //\r | |
222 | EFI_STATUS\r | |
223 | EFIAPI\r | |
224 | SmbusExecute (\r | |
225 | IN CONST EFI_SMBUS_HC_PROTOCOL *This,\r | |
226 | IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,\r | |
227 | IN CONST EFI_SMBUS_DEVICE_COMMAND Command,\r | |
228 | IN CONST EFI_SMBUS_OPERATION Operation,\r | |
229 | IN CONST BOOLEAN PecCheck,\r | |
230 | IN OUT UINTN *Length,\r | |
231 | IN OUT VOID *Buffer\r | |
232 | )\r | |
233 | {\r | |
234 | UINT8 *ByteBuffer = Buffer;\r | |
235 | EFI_STATUS Status = EFI_SUCCESS;\r | |
236 | UINT8 SlaveAddr = (UINT8)(SlaveAddress.SmbusDeviceAddress);\r | |
237 | \r | |
238 | if (PecCheck) {\r | |
239 | return EFI_UNSUPPORTED;\r | |
240 | }\r | |
241 | \r | |
242 | if ((Operation != EfiSmbusWriteBlock) && (Operation != EfiSmbusReadBlock)) {\r | |
243 | return EFI_UNSUPPORTED;\r | |
244 | }\r | |
245 | \r | |
246 | //Set the Slave address.\r | |
247 | MmioWrite16(I2C_SA, SlaveAddr);\r | |
248 | \r | |
249 | if (Operation == EfiSmbusReadBlock) {\r | |
250 | Status = SmbusBlockRead(ByteBuffer, *Length);\r | |
251 | } else if (Operation == EfiSmbusWriteBlock) {\r | |
252 | Status = SmbusBlockWrite(ByteBuffer, *Length);\r | |
253 | }\r | |
254 | \r | |
255 | return Status;\r | |
256 | }\r | |
257 | \r | |
258 | EFI_STATUS\r | |
259 | EFIAPI\r | |
260 | SmbusArpDevice (\r | |
261 | IN CONST EFI_SMBUS_HC_PROTOCOL *This,\r | |
262 | IN BOOLEAN ArpAll,\r | |
263 | IN EFI_SMBUS_UDID *SmbusUdid OPTIONAL,\r | |
264 | IN OUT EFI_SMBUS_DEVICE_ADDRESS *SlaveAddress OPTIONAL\r | |
265 | )\r | |
266 | {\r | |
267 | return EFI_UNSUPPORTED;\r | |
268 | }\r | |
269 | \r | |
270 | \r | |
271 | EFI_STATUS\r | |
272 | EFIAPI\r | |
273 | SmbusGetArpMap (\r | |
274 | IN CONST EFI_SMBUS_HC_PROTOCOL *This,\r | |
275 | IN OUT UINTN *Length,\r | |
276 | IN OUT EFI_SMBUS_DEVICE_MAP **SmbusDeviceMap\r | |
277 | )\r | |
278 | {\r | |
279 | return EFI_UNSUPPORTED;\r | |
280 | }\r | |
281 | \r | |
282 | \r | |
283 | EFI_STATUS\r | |
284 | EFIAPI\r | |
285 | SmbusNotify (\r | |
286 | IN CONST EFI_SMBUS_HC_PROTOCOL *This,\r | |
287 | IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,\r | |
288 | IN CONST UINTN Data,\r | |
289 | IN CONST EFI_SMBUS_NOTIFY_FUNCTION NotifyFunction\r | |
290 | )\r | |
291 | {\r | |
292 | return EFI_UNSUPPORTED;\r | |
293 | }\r | |
294 | \r | |
295 | EFI_SMBUS_HC_PROTOCOL SmbusProtocol =\r | |
296 | {\r | |
297 | SmbusExecute,\r | |
298 | SmbusArpDevice,\r | |
299 | SmbusGetArpMap,\r | |
300 | SmbusNotify\r | |
301 | };\r | |
302 | \r | |
303 | EFI_STATUS\r | |
304 | InitializeSmbus (\r | |
305 | IN EFI_HANDLE ImageHandle,\r | |
306 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
307 | )\r | |
308 | {\r | |
309 | EFI_HANDLE Handle = NULL;\r | |
310 | EFI_STATUS Status;\r | |
311 | \r | |
312 | //Configure I2C controller.\r | |
313 | Status = ConfigureI2c();\r | |
314 | if (EFI_ERROR(Status)) {\r | |
315 | DEBUG ((EFI_D_ERROR, "InitializeI2c fails.\n"));\r | |
316 | return Status;\r | |
317 | }\r | |
318 | \r | |
319 | // Install the SMBUS interface\r | |
320 | Status = gBS->InstallMultipleProtocolInterfaces(&Handle, &gEfiSmbusHcProtocolGuid, &SmbusProtocol, NULL);\r | |
321 | ASSERT_EFI_ERROR(Status);\r | |
3402aac7 | 322 | \r |
1e57a462 | 323 | return Status;\r |
324 | }\r | |
325 | \r |