summaryrefslogtreecommitdiff
path: root/MdeModulePkg/Universal/PcatSingleSegmentPciCfg2Pei/PciCfg2.c
blob: d2ca19c7b065156f2ad3c5c909d8ba37908188f3 (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
/** @file
  This driver installs Single Segment Pci Configuration 2 PPI 
  to provide read, write and modify access to Pci configuration space in PEI phase. 
  To follow PI specification, these services also support access to the unaligned Pci address.

  Copyright (c) 2006 - 2008, Intel Corporation
  All rights reserved. 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 <PiPei.h>
#include <Ppi/PciCfg2.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/PciLib.h>
#include <Library/PeimEntryPoint.h>
#include <IndustryStandard/Pci.h>

/**
   Convert EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS to PCI_LIB_ADDRESS.

   @param Address   PCI address with EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS format.

   @return PCI address with PCI_LIB_ADDRESS format.

**/
UINTN
PciCfgAddressConvert (
  EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *Address
  )
{
  if (Address->ExtendedRegister == 0) {
    return PCI_LIB_ADDRESS (Address->Bus, Address->Device, Address->Function, Address->Register);
  }

  return PCI_LIB_ADDRESS (Address->Bus, Address->Device, Address->Function, Address->ExtendedRegister);
}

/**
  Reads from a given location in the PCI configuration space.

  @param  PeiServices     An indirect pointer to the PEI Services Table published by the PEI Foundation.
  @param  This            Pointer to local data for the interface.
  @param  Width           The width of the access. Enumerated in bytes.
                          See EFI_PEI_PCI_CFG_PPI_WIDTH above.
  @param  Address         The physical address of the access. The format of
                          the address is described by EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS.
  @param  Buffer          A pointer to the buffer of data.

  @retval EFI_SUCCESS           The function completed successfully.
  @retval EFI_INVALID_PARAMETER The invalid access width.
  
**/
EFI_STATUS
EFIAPI
PciCfg2Read (
  IN CONST  EFI_PEI_SERVICES          **PeiServices,
  IN CONST  EFI_PEI_PCI_CFG2_PPI      *This,
  IN        EFI_PEI_PCI_CFG_PPI_WIDTH Width,
  IN        UINT64                    Address,
  IN OUT    VOID                      *Buffer
  )
{
  UINTN  PciLibAddress;

  PciLibAddress = PciCfgAddressConvert ((EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *) &Address);

  if (Width == EfiPeiPciCfgWidthUint8) {
    *((UINT8 *) Buffer) = PciRead8 (PciLibAddress);
  } else if (Width == EfiPeiPciCfgWidthUint16) {
    if ((PciLibAddress & 0x01) == 0) {
      //
      // Aligned Pci address access
      //
      WriteUnaligned16 (((UINT16 *) Buffer), PciRead16 (PciLibAddress));
    } else {
      //
      // Unaligned Pci address access, break up the request into byte by byte.
      //
      *((UINT8 *) Buffer) = PciRead8 (PciLibAddress);
      *((UINT8 *) Buffer + 1) = PciRead8 (PciLibAddress + 1);
    }
  } else if (Width == EfiPeiPciCfgWidthUint32) {
    if ((PciLibAddress & 0x03) == 0) {
      //
      // Aligned Pci address access
      //
      WriteUnaligned32 (((UINT32 *) Buffer), PciRead32 (PciLibAddress));
    } else if ((PciLibAddress & 0x01) == 0) {
      //
      // Unaligned Pci address access, break up the request into word by word.
      //
      WriteUnaligned16 (((UINT16 *) Buffer), PciRead16 (PciLibAddress));
      WriteUnaligned16 (((UINT16 *) Buffer + 1), PciRead16 (PciLibAddress + 2));
    } else {
      //
      // Unaligned Pci address access, break up the request into byte by byte.
      //
      *((UINT8 *) Buffer) = PciRead8 (PciLibAddress);
      *((UINT8 *) Buffer + 1) = PciRead8 (PciLibAddress + 1);
      *((UINT8 *) Buffer + 2) = PciRead8 (PciLibAddress + 2);
      *((UINT8 *) Buffer + 3) = PciRead8 (PciLibAddress + 3);
    }
  } else {
    return EFI_INVALID_PARAMETER;
  }

  return EFI_SUCCESS;
}

/**
  Write to a given location in the PCI configuration space.

  @param  PeiServices     An indirect pointer to the PEI Services Table published by the PEI Foundation.
  @param  This            Pointer to local data for the interface.
  @param  Width           The width of the access. Enumerated in bytes.
                          See EFI_PEI_PCI_CFG_PPI_WIDTH above.
  @param  Address         The physical address of the access. The format of
                          the address is described by EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS.
  @param  Buffer          A pointer to the buffer of data.

  @retval EFI_SUCCESS           The function completed successfully.
  @retval EFI_INVALID_PARAMETER The invalid access width.

**/
EFI_STATUS
EFIAPI
PciCfg2Write (
  IN CONST  EFI_PEI_SERVICES          **PeiServices,
  IN CONST  EFI_PEI_PCI_CFG2_PPI      *This,
  IN        EFI_PEI_PCI_CFG_PPI_WIDTH Width,
  IN        UINT64                    Address,
  IN OUT    VOID                      *Buffer
  )
{
  UINTN  PciLibAddress;

  PciLibAddress = PciCfgAddressConvert ((EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *) &Address);

  if (Width == EfiPeiPciCfgWidthUint8) {
    PciWrite8 (PciLibAddress, *((UINT8 *) Buffer));
  } else if (Width == EfiPeiPciCfgWidthUint16) {
    if ((PciLibAddress & 0x01) == 0) {
      //
      // Aligned Pci address access
      //
      PciWrite16 (PciLibAddress, ReadUnaligned16 ((UINT16 *) Buffer));
    } else {
      //
      // Unaligned Pci address access, break up the request into byte by byte.
      //
      PciWrite8 (PciLibAddress, *((UINT8 *) Buffer));
      PciWrite8 (PciLibAddress + 1, *((UINT8 *) Buffer + 1)); 
    }
  } else if (Width == EfiPeiPciCfgWidthUint32) {
    if ((PciLibAddress & 0x03) == 0) {
      //
      // Aligned Pci address access
      //
      PciWrite32 (PciLibAddress, ReadUnaligned32 ((UINT32 *) Buffer));
    } else if ((PciLibAddress & 0x01) == 0) {
      //
      // Unaligned Pci address access, break up the request into word by word.
      //
      PciWrite16 (PciLibAddress, ReadUnaligned16 ((UINT16 *) Buffer));
      PciWrite16 (PciLibAddress + 2, ReadUnaligned16 ((UINT16 *) Buffer + 1));
    } else {
      //
      // Unaligned Pci address access, break up the request into byte by byte.
      //
      PciWrite8 (PciLibAddress, *((UINT8 *) Buffer));
      PciWrite8 (PciLibAddress + 1, *((UINT8 *) Buffer + 1)); 
      PciWrite8 (PciLibAddress + 2, *((UINT8 *) Buffer + 2)); 
      PciWrite8 (PciLibAddress + 3, *((UINT8 *) Buffer + 3)); 
    }
  } else {
    return EFI_INVALID_PARAMETER;
  }

  return EFI_SUCCESS;
}


/**
  This function performs a read-modify-write operation on the contents from a given
  location in the PCI configuration space.

  @param  PeiServices     An indirect pointer to the PEI Services Table
                          published by the PEI Foundation.
  @param  This            Pointer to local data for the interface.
  @param  Width           The width of the access. Enumerated in bytes. Type
                          EFI_PEI_PCI_CFG_PPI_WIDTH is defined in Read().
  @param  Address         The physical address of the access.
  @param  SetBits         Points to value to bitwise-OR with the read configuration value.
                          The size of the value is determined by Width.
  @param  ClearBits       Points to the value to negate and bitwise-AND with the read configuration value.
                          The size of the value is determined by Width.

  @retval EFI_SUCCESS           The function completed successfully.
  @retval EFI_INVALID_PARAMETER The invalid access width.

**/
EFI_STATUS
EFIAPI
PciCfg2Modify (
  IN CONST  EFI_PEI_SERVICES          **PeiServices,
  IN CONST  EFI_PEI_PCI_CFG2_PPI      *This,
  IN        EFI_PEI_PCI_CFG_PPI_WIDTH Width,
  IN        UINT64                    Address,
  IN        VOID                      *SetBits,
  IN        VOID                      *ClearBits
  )
{
  UINTN   PciLibAddress;
  UINT16  ClearValue16;
  UINT16  SetValue16;
  UINT32  ClearValue32;
  UINT32  SetValue32;

  PciLibAddress = PciCfgAddressConvert ((EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *) &Address);

  if (Width == EfiPeiPciCfgWidthUint8) {
    PciAndThenOr8 (PciLibAddress, (UINT8) (~(*(UINT8 *) ClearBits)), *((UINT8 *) SetBits));
  } else if (Width == EfiPeiPciCfgWidthUint16) {
    if ((PciLibAddress & 0x01) == 0) {
      //
      // Aligned Pci address access
      //
      ClearValue16  = (UINT16) (~ReadUnaligned16 ((UINT16 *) ClearBits));
      SetValue16    = ReadUnaligned16 ((UINT16 *) SetBits);
      PciAndThenOr16 (PciLibAddress, ClearValue16, SetValue16);
    } else {
      //
      // Unaligned Pci address access, break up the request into byte by byte.
      //
      PciAndThenOr8 (PciLibAddress, (UINT8) (~(*(UINT8 *) ClearBits)), *((UINT8 *) SetBits));
      PciAndThenOr8 (PciLibAddress + 1, (UINT8) (~(*((UINT8 *) ClearBits + 1))), *((UINT8 *) SetBits + 1));
    }
  } else if (Width == EfiPeiPciCfgWidthUint32) {
    if ((PciLibAddress & 0x03) == 0) {
      //
      // Aligned Pci address access
      //
      ClearValue32  = (UINT32) (~ReadUnaligned32 ((UINT32 *) ClearBits));
      SetValue32    = ReadUnaligned32 ((UINT32 *) SetBits);
      PciAndThenOr32 (PciLibAddress, ClearValue32, SetValue32);
    } else if ((PciLibAddress & 0x01) == 0) {
      //
      // Unaligned Pci address access, break up the request into word by word.
      //
      ClearValue16  = (UINT16) (~ReadUnaligned16 ((UINT16 *) ClearBits));
      SetValue16    = ReadUnaligned16 ((UINT16 *) SetBits);
      PciAndThenOr16 (PciLibAddress, ClearValue16, SetValue16);

      ClearValue16  = (UINT16) (~ReadUnaligned16 ((UINT16 *) ClearBits + 1));
      SetValue16    = ReadUnaligned16 ((UINT16 *) SetBits + 1);
      PciAndThenOr16 (PciLibAddress + 2, ClearValue16, SetValue16);
    } else {
      //
      // Unaligned Pci address access, break up the request into byte by byte.
      //
      PciAndThenOr8 (PciLibAddress, (UINT8) (~(*(UINT8 *) ClearBits)), *((UINT8 *) SetBits));
      PciAndThenOr8 (PciLibAddress + 1, (UINT8) (~(*((UINT8 *) ClearBits + 1))), *((UINT8 *) SetBits + 1));
      PciAndThenOr8 (PciLibAddress + 2, (UINT8) (~(*((UINT8 *) ClearBits + 2))), *((UINT8 *) SetBits + 2));
      PciAndThenOr8 (PciLibAddress + 3, (UINT8) (~(*((UINT8 *) ClearBits + 3))), *((UINT8 *) SetBits + 3));
    }
  } else {
    return EFI_INVALID_PARAMETER;
  }

  return EFI_SUCCESS;
}

EFI_PEI_PCI_CFG2_PPI gPciCfg2Ppi = {
  PciCfg2Read,
  PciCfg2Write,
  PciCfg2Modify,
  0
};

EFI_PEI_PPI_DESCRIPTOR gPciCfg2PpiList = {
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gEfiPciCfg2PpiGuid,
  &gPciCfg2Ppi
};

/**
  Module's entry function. 
  This routine will install EFI_PEI_PCI_CFG2_PPI.
  
  @param  FileHandle  Handle of the file being invoked.
  @param  PeiServices Describes the list of possible PEI Services.

  @return Whether success to install service.
**/
EFI_STATUS
EFIAPI
PeimInitializePciCfg (
  IN       EFI_PEI_FILE_HANDLE  FileHandle,
  IN CONST EFI_PEI_SERVICES     **PeiServices
  )
{
  EFI_STATUS            Status;

  ASSERT ((**PeiServices).Hdr.Revision >= PI_SPECIFICATION_VERSION);

  (**(EFI_PEI_SERVICES **)PeiServices).PciCfg = &gPciCfg2Ppi;
  Status = (**PeiServices).InstallPpi (PeiServices, &gPciCfg2PpiList);

  return Status;
}