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a3f98646 | 1 | /** @file |
2 | ||
3d70643b | 3 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> |
a3f98646 | 4 | |
3d70643b | 5 | This program and the accompanying materials |
a3f98646 | 6 | are licensed and made available under the terms and conditions of the BSD License |
7 | which accompanies this distribution. The full text of the license may be found at | |
8 | http://opensource.org/licenses/bsd-license.php | |
9 | ||
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
12 | ||
13 | **/ | |
14 | ||
15 | #include <Uefi.h> | |
16 | #include <Omap3530/Omap3530.h> | |
17 | ||
18 | #include <Library/DebugLib.h> | |
19 | #include <Library/IoLib.h> | |
20 | #include <Library/UefiBootServicesTableLib.h> | |
21 | ||
22 | #include <Protocol/SmbusHc.h> | |
23 | ||
24 | #define MAX_RETRY 1000 | |
25 | ||
26 | // | |
27 | // Internal Functions | |
28 | // | |
29 | STATIC | |
30 | EFI_STATUS | |
31 | WaitForBusBusy ( | |
32 | VOID | |
33 | ) | |
34 | { | |
35 | UINTN Retry = 0; | |
36 | ||
37 | while (++Retry < MAX_RETRY && (MmioRead16(I2C_STAT) & BB) == 0x1); | |
38 | ||
39 | if (Retry == MAX_RETRY) { | |
40 | return EFI_TIMEOUT; | |
41 | } | |
42 | ||
43 | return EFI_SUCCESS; | |
44 | } | |
45 | ||
46 | STATIC | |
47 | EFI_STATUS | |
48 | PollForStatus( | |
49 | UINT16 StatusBit | |
50 | ) | |
51 | { | |
52 | UINTN Retry = 0; | |
53 | ||
54 | while(Retry < MAX_RETRY) { | |
55 | if (MmioRead16(I2C_STAT) & StatusBit) { | |
56 | //Clear particular status bit from Status register. | |
57 | MmioOr16(I2C_STAT, StatusBit); | |
58 | break; | |
59 | } | |
60 | Retry++; | |
61 | } | |
62 | ||
63 | if (Retry == MAX_RETRY) { | |
64 | return EFI_TIMEOUT; | |
65 | } | |
66 | ||
67 | return EFI_SUCCESS; | |
68 | } | |
69 | ||
70 | STATIC | |
71 | EFI_STATUS | |
72 | ConfigureI2c ( | |
73 | VOID | |
74 | ) | |
75 | { | |
76 | //Program prescaler to obtain 12-MHz clock | |
77 | MmioWrite16(I2C_PSC, 0x0000); | |
78 | ||
79 | //Program SCLL and SCLH | |
80 | //NOTE: Following values are the register dump after U-Boot code executed. | |
81 | //We need to figure out how its calculated based on the I2C functional clock and I2C_PSC. | |
82 | MmioWrite16(I2C_SCLL, 0x0035); | |
83 | MmioWrite16(I2C_SCLH, 0x0035); | |
84 | ||
85 | //Take the I2C controller out of reset. | |
86 | MmioOr16(I2C_CON, I2C_EN); | |
87 | ||
88 | //Initialize the I2C controller. | |
89 | ||
90 | //Set I2C controller in Master mode. | |
91 | MmioOr16(I2C_CON, MST); | |
92 | ||
93 | //Enable interrupts for receive/transmit mode. | |
94 | MmioOr16(I2C_IE, (XRDY_IE | RRDY_IE | ARDY_IE | NACK_IE)); | |
95 | ||
96 | return EFI_SUCCESS; | |
97 | } | |
98 | ||
99 | STATIC | |
100 | EFI_STATUS | |
101 | I2CReadOneByte ( | |
102 | UINT8 *Data | |
103 | ) | |
104 | { | |
105 | EFI_STATUS Status; | |
106 | ||
107 | //I2C bus status checking | |
108 | Status = WaitForBusBusy(); | |
109 | if (EFI_ERROR(Status)) { | |
110 | return Status; | |
111 | } | |
112 | ||
113 | //Poll till Receive ready bit is set. | |
114 | Status = PollForStatus(RRDY); | |
115 | if (EFI_ERROR(Status)) { | |
116 | return Status; | |
117 | } | |
118 | ||
119 | *Data = MmioRead8(I2C_DATA); | |
120 | ||
121 | return EFI_SUCCESS; | |
122 | } | |
123 | ||
124 | STATIC | |
125 | EFI_STATUS | |
126 | I2CWriteOneByte ( | |
127 | UINT8 Data | |
128 | ) | |
129 | { | |
130 | EFI_STATUS Status; | |
131 | ||
132 | //I2C bus status checking | |
133 | Status = WaitForBusBusy(); | |
134 | if (EFI_ERROR(Status)) { | |
135 | return Status; | |
136 | } | |
137 | ||
138 | //Data transfer | |
139 | //Poll till Transmit ready bit is set | |
140 | Status = PollForStatus(XRDY); | |
141 | if (EFI_ERROR(Status)) { | |
142 | return Status; | |
143 | } | |
144 | ||
145 | MmioWrite8(I2C_DATA, Data); | |
146 | ||
147 | //Wait and check if the NACK is not set. | |
148 | gBS->Stall(1000); | |
149 | if (MmioRead16(I2C_STAT) & NACK) { | |
150 | return EFI_DEVICE_ERROR; | |
151 | } | |
152 | ||
153 | return EFI_SUCCESS; | |
154 | } | |
155 | ||
156 | STATIC | |
157 | EFI_STATUS | |
158 | SmbusBlockRead ( | |
159 | OUT UINT8 *Buffer, | |
160 | IN UINTN Length | |
161 | ) | |
162 | { | |
163 | UINTN Index = 0; | |
164 | EFI_STATUS Status = EFI_SUCCESS; | |
165 | ||
166 | //Transfer configuration for receiving data. | |
167 | MmioWrite16(I2C_CNT, Length); | |
168 | //Need stop bit before sending data. | |
169 | MmioWrite16(I2C_CON, (I2C_EN | MST | STP | STT)); | |
170 | ||
171 | while (Index < Length) { | |
172 | //Read a byte | |
173 | Status = I2CReadOneByte(&Buffer[Index++]); | |
174 | if (EFI_ERROR(Status)) { | |
175 | return Status; | |
176 | } | |
177 | } | |
178 | ||
179 | //Transfer completion | |
180 | Status = PollForStatus(ARDY); | |
181 | if (EFI_ERROR(Status)) { | |
182 | return Status; | |
183 | } | |
184 | ||
185 | return Status; | |
186 | } | |
187 | ||
188 | STATIC | |
189 | EFI_STATUS | |
190 | SmbusBlockWrite ( | |
191 | IN UINT8 *Buffer, | |
192 | IN UINTN Length | |
193 | ) | |
194 | { | |
195 | UINTN Index = 0; | |
196 | EFI_STATUS Status = EFI_SUCCESS; | |
197 | ||
198 | //Transfer configuration for transmitting data | |
199 | MmioWrite16(I2C_CNT, Length); | |
200 | MmioWrite16(I2C_CON, (I2C_EN | TRX | MST | STT | STP)); | |
201 | ||
202 | while (Index < Length) { | |
203 | //Send a byte | |
204 | Status = I2CWriteOneByte(Buffer[Index++]); | |
205 | if (EFI_ERROR(Status)) { | |
206 | return Status; | |
207 | } | |
208 | } | |
209 | ||
210 | //Transfer completion | |
211 | Status = PollForStatus(ARDY); | |
212 | if (EFI_ERROR(Status)) { | |
213 | return Status; | |
214 | } | |
215 | ||
216 | return Status; | |
217 | } | |
218 | ||
219 | // | |
220 | // Public Functions. | |
221 | // | |
222 | EFI_STATUS | |
223 | EFIAPI | |
224 | SmbusExecute ( | |
225 | IN CONST EFI_SMBUS_HC_PROTOCOL *This, | |
226 | IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress, | |
227 | IN CONST EFI_SMBUS_DEVICE_COMMAND Command, | |
228 | IN CONST EFI_SMBUS_OPERATION Operation, | |
229 | IN CONST BOOLEAN PecCheck, | |
230 | IN OUT UINTN *Length, | |
231 | IN OUT VOID *Buffer | |
232 | ) | |
233 | { | |
234 | UINT8 *ByteBuffer = Buffer; | |
235 | EFI_STATUS Status = EFI_SUCCESS; | |
236 | UINT8 SlaveAddr = (UINT8)(SlaveAddress.SmbusDeviceAddress); | |
237 | ||
238 | if (PecCheck) { | |
239 | return EFI_UNSUPPORTED; | |
240 | } | |
241 | ||
242 | if ((Operation != EfiSmbusWriteBlock) && (Operation != EfiSmbusReadBlock)) { | |
243 | return EFI_UNSUPPORTED; | |
244 | } | |
245 | ||
246 | //Set the Slave address. | |
247 | MmioWrite16(I2C_SA, SlaveAddr); | |
248 | ||
249 | if (Operation == EfiSmbusReadBlock) { | |
250 | Status = SmbusBlockRead(ByteBuffer, *Length); | |
251 | } else if (Operation == EfiSmbusWriteBlock) { | |
252 | Status = SmbusBlockWrite(ByteBuffer, *Length); | |
253 | } | |
254 | ||
255 | return Status; | |
256 | } | |
257 | ||
258 | EFI_STATUS | |
259 | EFIAPI | |
260 | SmbusArpDevice ( | |
261 | IN CONST EFI_SMBUS_HC_PROTOCOL *This, | |
262 | IN CONST BOOLEAN ArpAll, | |
263 | IN CONST EFI_SMBUS_UDID *SmbusUdid OPTIONAL, | |
264 | IN OUT EFI_SMBUS_DEVICE_ADDRESS *SlaveAddress OPTIONAL | |
265 | ) | |
266 | { | |
267 | return EFI_UNSUPPORTED; | |
268 | } | |
269 | ||
270 | ||
271 | EFI_STATUS | |
272 | EFIAPI | |
273 | SmbusGetArpMap ( | |
274 | IN CONST EFI_SMBUS_HC_PROTOCOL *This, | |
275 | IN OUT UINTN *Length, | |
276 | IN OUT EFI_SMBUS_DEVICE_MAP **SmbusDeviceMap | |
277 | ) | |
278 | { | |
279 | return EFI_UNSUPPORTED; | |
280 | } | |
281 | ||
282 | ||
283 | EFI_STATUS | |
284 | EFIAPI | |
285 | SmbusNotify ( | |
286 | IN CONST EFI_SMBUS_HC_PROTOCOL *This, | |
287 | IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress, | |
288 | IN CONST UINTN Data, | |
289 | IN CONST EFI_SMBUS_NOTIFY_FUNCTION NotifyFunction | |
290 | ) | |
291 | { | |
292 | return EFI_UNSUPPORTED; | |
293 | } | |
294 | ||
295 | EFI_SMBUS_HC_PROTOCOL SmbusProtocol = | |
296 | { | |
297 | SmbusExecute, | |
298 | SmbusArpDevice, | |
299 | SmbusGetArpMap, | |
300 | SmbusNotify | |
301 | }; | |
302 | ||
303 | EFI_STATUS | |
304 | InitializeSmbus ( | |
305 | IN EFI_HANDLE ImageHandle, | |
306 | IN EFI_SYSTEM_TABLE *SystemTable | |
307 | ) | |
308 | { | |
309 | EFI_HANDLE Handle = NULL; | |
310 | EFI_STATUS Status; | |
311 | ||
312 | //Configure I2C controller. | |
313 | Status = ConfigureI2c(); | |
314 | if (EFI_ERROR(Status)) { | |
315 | DEBUG ((EFI_D_ERROR, "InitializeI2c fails.\n")); | |
316 | return Status; | |
317 | } | |
318 | ||
319 | // Install the SMBUS interface | |
320 | Status = gBS->InstallMultipleProtocolInterfaces(&Handle, &gEfiSmbusHcProtocolGuid, &SmbusProtocol, NULL); | |
321 | ASSERT_EFI_ERROR(Status); | |
322 | ||
323 | return Status; | |
324 | } | |
325 |