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8016da21 | 1 | /** @file\r |
2 | Legacy Interrupt Support\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | \r | |
b26f0cf9 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
8016da21 | 7 | \r |
8 | **/\r | |
9 | \r | |
10 | #include "LegacyInterrupt.h"\r | |
11 | \r | |
12 | //\r | |
13 | // Handle for the Legacy Interrupt Protocol instance produced by this driver\r | |
14 | //\r | |
ac0a286f | 15 | STATIC EFI_HANDLE mLegacyInterruptHandle = NULL;\r |
8016da21 | 16 | \r |
72a11001 GS |
17 | //\r |
18 | // Legacy Interrupt Device number (0x01 on piix4, 0x1f on q35/mch)\r | |
19 | //\r | |
ac0a286f | 20 | STATIC UINT8 mLegacyInterruptDevice;\r |
72a11001 | 21 | \r |
8016da21 | 22 | //\r |
23 | // The Legacy Interrupt Protocol instance produced by this driver\r | |
24 | //\r | |
ac0a286f | 25 | STATIC EFI_LEGACY_INTERRUPT_PROTOCOL mLegacyInterrupt = {\r |
8016da21 | 26 | GetNumberPirqs,\r |
27 | GetLocation,\r | |
28 | ReadPirq,\r | |
29 | WritePirq\r | |
30 | };\r | |
31 | \r | |
ac0a286f | 32 | STATIC UINT8 PirqReg[MAX_PIRQ_NUMBER] = { PIRQA, PIRQB, PIRQC, PIRQD, PIRQE, PIRQF, PIRQG, PIRQH };\r |
8016da21 | 33 | \r |
34 | /**\r | |
35 | Return the number of PIRQs supported by this chipset.\r | |
36 | \r | |
37 | @param[in] This Pointer to LegacyInterrupt Protocol\r | |
38 | @param[out] NumberPirqs The pointer to return the max IRQ number supported\r | |
39 | \r | |
40 | @retval EFI_SUCCESS Max PIRQs successfully returned\r | |
41 | \r | |
42 | **/\r | |
43 | EFI_STATUS\r | |
44 | EFIAPI\r | |
45 | GetNumberPirqs (\r | |
46 | IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,\r | |
47 | OUT UINT8 *NumberPirqs\r | |
48 | )\r | |
49 | {\r | |
50 | *NumberPirqs = MAX_PIRQ_NUMBER;\r | |
51 | \r | |
52 | return EFI_SUCCESS;\r | |
53 | }\r | |
54 | \r | |
8016da21 | 55 | /**\r |
56 | Return PCI location of this device.\r | |
57 | $PIR table requires this info.\r | |
58 | \r | |
59 | @param[in] This - Protocol instance pointer.\r | |
60 | @param[out] Bus - PCI Bus\r | |
61 | @param[out] Device - PCI Device\r | |
62 | @param[out] Function - PCI Function\r | |
63 | \r | |
64 | @retval EFI_SUCCESS Bus/Device/Function returned\r | |
65 | \r | |
66 | **/\r | |
67 | EFI_STATUS\r | |
68 | EFIAPI\r | |
69 | GetLocation (\r | |
70 | IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,\r | |
71 | OUT UINT8 *Bus,\r | |
72 | OUT UINT8 *Device,\r | |
73 | OUT UINT8 *Function\r | |
74 | )\r | |
75 | {\r | |
76 | *Bus = LEGACY_INT_BUS;\r | |
72a11001 | 77 | *Device = mLegacyInterruptDevice;\r |
8016da21 | 78 | *Function = LEGACY_INT_FUNC;\r |
79 | \r | |
80 | return EFI_SUCCESS;\r | |
81 | }\r | |
82 | \r | |
8016da21 | 83 | /**\r |
84 | Builds the PCI configuration address for the register specified by PirqNumber\r | |
85 | \r | |
86 | @param[in] PirqNumber - The PIRQ number to build the PCI configuration address for\r | |
87 | \r | |
88 | @return The PCI Configuration address for the PIRQ\r | |
89 | **/\r | |
90 | UINTN\r | |
91 | GetAddress (\r | |
92 | UINT8 PirqNumber\r | |
93 | )\r | |
94 | {\r | |
ac0a286f MK |
95 | return PCI_LIB_ADDRESS (\r |
96 | LEGACY_INT_BUS,\r | |
97 | mLegacyInterruptDevice,\r | |
98 | LEGACY_INT_FUNC,\r | |
99 | PirqReg[PirqNumber]\r | |
100 | );\r | |
8016da21 | 101 | }\r |
102 | \r | |
103 | /**\r | |
104 | Read the given PIRQ register\r | |
105 | \r | |
106 | @param[in] This Protocol instance pointer\r | |
107 | @param[in] PirqNumber The Pirq register 0 = A, 1 = B etc\r | |
108 | @param[out] PirqData Value read\r | |
109 | \r | |
110 | @retval EFI_SUCCESS Decoding change affected.\r | |
111 | @retval EFI_INVALID_PARAMETER Invalid PIRQ number\r | |
112 | \r | |
113 | **/\r | |
114 | EFI_STATUS\r | |
115 | EFIAPI\r | |
116 | ReadPirq (\r | |
117 | IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,\r | |
118 | IN UINT8 PirqNumber,\r | |
119 | OUT UINT8 *PirqData\r | |
120 | )\r | |
121 | {\r | |
122 | if (PirqNumber >= MAX_PIRQ_NUMBER) {\r | |
123 | return EFI_INVALID_PARAMETER;\r | |
124 | }\r | |
125 | \r | |
126 | *PirqData = PciRead8 (GetAddress (PirqNumber));\r | |
ac0a286f | 127 | *PirqData = (UINT8)(*PirqData & 0x7f);\r |
8016da21 | 128 | \r |
129 | return EFI_SUCCESS;\r | |
130 | }\r | |
131 | \r | |
8016da21 | 132 | /**\r |
133 | Write the given PIRQ register\r | |
134 | \r | |
135 | @param[in] This Protocol instance pointer\r | |
136 | @param[in] PirqNumber The Pirq register 0 = A, 1 = B etc\r | |
137 | @param[out] PirqData Value to write\r | |
138 | \r | |
139 | @retval EFI_SUCCESS Decoding change affected.\r | |
140 | @retval EFI_INVALID_PARAMETER Invalid PIRQ number\r | |
141 | \r | |
142 | **/\r | |
143 | EFI_STATUS\r | |
144 | EFIAPI\r | |
145 | WritePirq (\r | |
146 | IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,\r | |
147 | IN UINT8 PirqNumber,\r | |
148 | IN UINT8 PirqData\r | |
149 | )\r | |
150 | {\r | |
151 | if (PirqNumber >= MAX_PIRQ_NUMBER) {\r | |
152 | return EFI_INVALID_PARAMETER;\r | |
153 | }\r | |
154 | \r | |
155 | PciWrite8 (GetAddress (PirqNumber), PirqData);\r | |
156 | return EFI_SUCCESS;\r | |
157 | }\r | |
158 | \r | |
8016da21 | 159 | /**\r |
160 | Initialize Legacy Interrupt support\r | |
161 | \r | |
162 | @retval EFI_SUCCESS Successfully initialized\r | |
163 | \r | |
164 | **/\r | |
165 | EFI_STATUS\r | |
166 | LegacyInterruptInstall (\r | |
167 | VOID\r | |
168 | )\r | |
169 | {\r | |
72a11001 | 170 | UINT16 HostBridgeDevId;\r |
8016da21 | 171 | EFI_STATUS Status;\r |
172 | \r | |
173 | //\r | |
174 | // Make sure the Legacy Interrupt Protocol is not already installed in the system\r | |
175 | //\r | |
ac0a286f | 176 | ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyInterruptProtocolGuid);\r |
8016da21 | 177 | \r |
72a11001 GS |
178 | //\r |
179 | // Query Host Bridge DID to determine platform type, then set device number\r | |
180 | //\r | |
181 | HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);\r | |
182 | switch (HostBridgeDevId) {\r | |
183 | case INTEL_82441_DEVICE_ID:\r | |
184 | mLegacyInterruptDevice = LEGACY_INT_DEV_PIIX4;\r | |
185 | break;\r | |
186 | case INTEL_Q35_MCH_DEVICE_ID:\r | |
187 | mLegacyInterruptDevice = LEGACY_INT_DEV_Q35;\r | |
188 | break;\r | |
189 | default:\r | |
ac0a286f MK |
190 | DEBUG ((\r |
191 | DEBUG_ERROR,\r | |
192 | "%a: Unknown Host Bridge Device ID: 0x%04x\n",\r | |
193 | __FUNCTION__,\r | |
194 | HostBridgeDevId\r | |
195 | ));\r | |
72a11001 GS |
196 | ASSERT (FALSE);\r |
197 | return EFI_UNSUPPORTED;\r | |
198 | }\r | |
199 | \r | |
8016da21 | 200 | //\r |
201 | // Make a new handle and install the protocol\r | |
202 | //\r | |
203 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
204 | &mLegacyInterruptHandle,\r | |
205 | &gEfiLegacyInterruptProtocolGuid,\r | |
206 | &mLegacyInterrupt,\r | |
207 | NULL\r | |
208 | );\r | |
ac0a286f | 209 | ASSERT_EFI_ERROR (Status);\r |
8016da21 | 210 | \r |
211 | return Status;\r | |
212 | }\r |