summaryrefslogtreecommitdiff
path: root/Omap35xxPkg/InterruptDxe/HardwareInterrupt.c
blob: 5040c4b152c568045180d3dc647d92955df1d758 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
/** @file
  Handle OMAP35xx interrupt controller 

  Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
  
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/
#include <PiDxe.h>

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/ArmLib.h>

#include <Protocol/Cpu.h>
#include <Protocol/HardwareInterrupt.h>

#include <Omap3530/Omap3530.h>

//
// Notifications
//
EFI_EVENT EfiExitBootServicesEvent      = (EFI_EVENT)NULL;


HARDWARE_INTERRUPT_HANDLER  gRegisteredInterruptHandlers[INT_NROF_VECTORS];

/**
  Shutdown our hardware
  
  DXE Core will disable interrupts and turn off the timer and disable interrupts
  after all the event handlers have run.

  @param[in]  Event   The Event that is being processed
  @param[in]  Context Event Context
**/
VOID
EFIAPI
ExitBootServicesEvent (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  // Disable all interrupts
  MmioWrite32 (INTCPS_MIR(0), 0xFFFFFFFF);
  MmioWrite32 (INTCPS_MIR(1), 0xFFFFFFFF);
  MmioWrite32 (INTCPS_MIR(2), 0xFFFFFFFF);
  MmioWrite32 (INTCPS_CONTROL, INTCPS_CONTROL_NEWIRQAGR);

  // Add code here to disable all FIQs as debugger may have turned one on
}

/**
  Register Handler for the specified interrupt source.

  @param This     Instance pointer for this protocol
  @param Source   Hardware source of the interrupt
  @param Handler  Callback for interrupt. NULL to unregister

  @retval EFI_SUCCESS Source was updated to support Handler.
  @retval EFI_DEVICE_ERROR  Hardware could not be programmed.

**/
EFI_STATUS
EFIAPI
RegisterInterruptSource (
  IN EFI_HARDWARE_INTERRUPT_PROTOCOL    *This,
  IN HARDWARE_INTERRUPT_SOURCE          Source,
  IN HARDWARE_INTERRUPT_HANDLER         Handler
  )
{
  if (Source > MAX_VECTOR) {
    ASSERT(FALSE);
    return EFI_UNSUPPORTED;
  } 
  
  if ((MmioRead32 (INTCPS_ILR(Source)) & INTCPS_ILR_FIQ) == INTCPS_ILR_FIQ) {
    // This vector has been programmed as FIQ so we can't use it for IRQ
    // EFI does not use FIQ, but the debugger can use it to check for 
    // ctrl-c. So this ASSERT means you have a conflict with the debug agent
    ASSERT (FALSE);
    return EFI_UNSUPPORTED;
  }
  
  if ((Handler == NULL) && (gRegisteredInterruptHandlers[Source] == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  if ((Handler != NULL) && (gRegisteredInterruptHandlers[Source] != NULL)) {
    return EFI_ALREADY_STARTED;
  }

  gRegisteredInterruptHandlers[Source] = Handler;
  return This->EnableInterruptSource(This, Source);
}


/**
  Enable interrupt source Source.

  @param This     Instance pointer for this protocol
  @param Source   Hardware source of the interrupt

  @retval EFI_SUCCESS       Source interrupt enabled.
  @retval EFI_DEVICE_ERROR  Hardware could not be programmed.

**/
EFI_STATUS
EFIAPI
EnableInterruptSource (
  IN EFI_HARDWARE_INTERRUPT_PROTOCOL    *This,
  IN HARDWARE_INTERRUPT_SOURCE          Source
  )
{
  UINTN Bank;
  UINTN Bit;
  
  if (Source > MAX_VECTOR) {
    ASSERT(FALSE);
    return EFI_UNSUPPORTED;
  }
  
  Bank = Source / 32;
  Bit  = 1UL << (Source % 32);
  
  MmioWrite32 (INTCPS_MIR_CLEAR(Bank), Bit);
  
  return EFI_SUCCESS;
}


/**
  Disable interrupt source Source.

  @param This     Instance pointer for this protocol
  @param Source   Hardware source of the interrupt

  @retval EFI_SUCCESS       Source interrupt disabled.
  @retval EFI_DEVICE_ERROR  Hardware could not be programmed.

**/
EFI_STATUS
EFIAPI
DisableInterruptSource (
  IN EFI_HARDWARE_INTERRUPT_PROTOCOL    *This,
  IN HARDWARE_INTERRUPT_SOURCE          Source
  )
{
  UINTN Bank;
  UINTN Bit;
  
  if (Source > MAX_VECTOR) {
    ASSERT(FALSE);
    return EFI_UNSUPPORTED;
  }
  
  Bank = Source / 32;
  Bit  = 1UL << (Source % 32);
  
  MmioWrite32 (INTCPS_MIR_SET(Bank), Bit);
  
  return EFI_SUCCESS;
}



/**
  Return current state of interrupt source Source.

  @param This     Instance pointer for this protocol
  @param Source   Hardware source of the interrupt
  @param InterruptState  TRUE: source enabled, FALSE: source disabled.

  @retval EFI_SUCCESS       InterruptState is valid
  @retval EFI_DEVICE_ERROR  InterruptState is not valid

**/
EFI_STATUS
EFIAPI
GetInterruptSourceState (
  IN EFI_HARDWARE_INTERRUPT_PROTOCOL    *This,
  IN HARDWARE_INTERRUPT_SOURCE          Source,
  IN BOOLEAN                            *InterruptState
  )
{
  UINTN Bank;
  UINTN Bit;
  
  if (InterruptState == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  
  if (Source > MAX_VECTOR) {
    ASSERT(FALSE);
    return EFI_UNSUPPORTED;
  }

  Bank = Source / 32;
  Bit  = 1UL << (Source % 32);
    
  if ((MmioRead32(INTCPS_MIR(Bank)) & Bit) == Bit) {
    *InterruptState = FALSE;
  } else {
    *InterruptState = TRUE;
  }
  
  return EFI_SUCCESS;
}

/**
  Signal to the hardware that the End Of Intrrupt state 
  has been reached.

  @param This     Instance pointer for this protocol
  @param Source   Hardware source of the interrupt

  @retval EFI_SUCCESS       Source interrupt EOI'ed.
  @retval EFI_DEVICE_ERROR  Hardware could not be programmed.

**/
EFI_STATUS
EFIAPI
EndOfInterrupt (
  IN EFI_HARDWARE_INTERRUPT_PROTOCOL    *This,
  IN HARDWARE_INTERRUPT_SOURCE          Source
  )
{
  MmioWrite32 (INTCPS_CONTROL, INTCPS_CONTROL_NEWIRQAGR);
  ArmDataSyncronizationBarrier ();
  return EFI_SUCCESS;
}


/**
  EFI_CPU_INTERRUPT_HANDLER that is called when a processor interrupt occurs.

  @param  InterruptType    Defines the type of interrupt or exception that
                           occurred on the processor.This parameter is processor architecture specific.
  @param  SystemContext    A pointer to the processor context when
                           the interrupt occurred on the processor.

  @return None

**/
VOID
EFIAPI
IrqInterruptHandler (
  IN EFI_EXCEPTION_TYPE           InterruptType,
  IN EFI_SYSTEM_CONTEXT           SystemContext
  )
{
  UINT32                     Vector;
  HARDWARE_INTERRUPT_HANDLER InterruptHandler;
  
  Vector = MmioRead32 (INTCPS_SIR_IRQ) & INTCPS_SIR_IRQ_MASK;

  // Needed to prevent infinite nesting when Time Driver lowers TPL
  MmioWrite32 (INTCPS_CONTROL, INTCPS_CONTROL_NEWIRQAGR);
  ArmDataSyncronizationBarrier ();
  
  InterruptHandler = gRegisteredInterruptHandlers[Vector];
  if (InterruptHandler != NULL) {
    // Call the registered interrupt handler.
    InterruptHandler (Vector, SystemContext);
  }
  
  // Needed to clear after running the handler
  MmioWrite32 (INTCPS_CONTROL, INTCPS_CONTROL_NEWIRQAGR);
  ArmDataSyncronizationBarrier ();
}

//
// Making this global saves a few bytes in image size
//
EFI_HANDLE  gHardwareInterruptHandle = NULL;

//
// The protocol instance produced by this driver
//
EFI_HARDWARE_INTERRUPT_PROTOCOL gHardwareInterruptProtocol = {
  RegisterInterruptSource,
  EnableInterruptSource,
  DisableInterruptSource,
  GetInterruptSourceState,
  EndOfInterrupt
};

/**
  Initialize the state information for the CPU Architectural Protocol

  @param  ImageHandle   of the loaded driver
  @param  SystemTable   Pointer to the System Table

  @retval EFI_SUCCESS           Protocol registered
  @retval EFI_OUT_OF_RESOURCES  Cannot allocate protocol data structure
  @retval EFI_DEVICE_ERROR      Hardware problems

**/
EFI_STATUS
InterruptDxeInitialize (
  IN EFI_HANDLE         ImageHandle,
  IN EFI_SYSTEM_TABLE   *SystemTable
  )
{
  EFI_STATUS  Status;
  EFI_CPU_ARCH_PROTOCOL   *Cpu;

  // Make sure the Interrupt Controller Protocol is not already installed in the system.
  ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gHardwareInterruptProtocolGuid);

  // Make sure all interrupts are disabled by default.
  MmioWrite32 (INTCPS_MIR(0), 0xFFFFFFFF);
  MmioWrite32 (INTCPS_MIR(1), 0xFFFFFFFF);
  MmioWrite32 (INTCPS_MIR(2), 0xFFFFFFFF);
  MmioOr32 (INTCPS_CONTROL, INTCPS_CONTROL_NEWIRQAGR);
 
  Status = gBS->InstallMultipleProtocolInterfaces(&gHardwareInterruptHandle,
                                                  &gHardwareInterruptProtocolGuid,   &gHardwareInterruptProtocol,
                                                  NULL);
  ASSERT_EFI_ERROR(Status);
  
  //
  // Get the CPU protocol that this driver requires.
  //
  Status = gBS->LocateProtocol(&gEfiCpuArchProtocolGuid, NULL, (VOID **)&Cpu);
  ASSERT_EFI_ERROR(Status);

  //
  // Unregister the default exception handler.
  //
  Status = Cpu->RegisterInterruptHandler(Cpu, EXCEPT_ARM_IRQ, NULL);
  ASSERT_EFI_ERROR(Status);

  //
  // Register to receive interrupts
  //
  Status = Cpu->RegisterInterruptHandler(Cpu, EXCEPT_ARM_IRQ, IrqInterruptHandler);
  ASSERT_EFI_ERROR(Status);

  // Register for an ExitBootServicesEvent
  Status = gBS->CreateEvent(EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_NOTIFY, ExitBootServicesEvent, NULL, &EfiExitBootServicesEvent);
  ASSERT_EFI_ERROR(Status);

  return Status;
}