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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __PCI_BRIDGE_EMUL_H__ | |
3 | #define __PCI_BRIDGE_EMUL_H__ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | ||
7 | /* PCI configuration space of a PCI-to-PCI bridge. */ | |
8 | struct pci_bridge_emul_conf { | |
e0d9d30b GJ |
9 | __le16 vendor; |
10 | __le16 device; | |
11 | __le16 command; | |
12 | __le16 status; | |
13 | __le32 class_revision; | |
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14 | u8 cache_line_size; |
15 | u8 latency_timer; | |
16 | u8 header_type; | |
17 | u8 bist; | |
e0d9d30b | 18 | __le32 bar[2]; |
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19 | u8 primary_bus; |
20 | u8 secondary_bus; | |
21 | u8 subordinate_bus; | |
22 | u8 secondary_latency_timer; | |
23 | u8 iobase; | |
24 | u8 iolimit; | |
e0d9d30b GJ |
25 | __le16 secondary_status; |
26 | __le16 membase; | |
27 | __le16 memlimit; | |
28 | __le16 pref_mem_base; | |
29 | __le16 pref_mem_limit; | |
30 | __le32 prefbaseupper; | |
31 | __le32 preflimitupper; | |
32 | __le16 iobaseupper; | |
33 | __le16 iolimitupper; | |
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34 | u8 capabilities_pointer; |
35 | u8 reserve[3]; | |
e0d9d30b | 36 | __le32 romaddr; |
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37 | u8 intline; |
38 | u8 intpin; | |
e0d9d30b | 39 | __le16 bridgectrl; |
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40 | }; |
41 | ||
42 | /* PCI configuration space of the PCIe capabilities */ | |
43 | struct pci_bridge_emul_pcie_conf { | |
44 | u8 cap_id; | |
45 | u8 next; | |
e0d9d30b GJ |
46 | __le16 cap; |
47 | __le32 devcap; | |
48 | __le16 devctl; | |
49 | __le16 devsta; | |
50 | __le32 lnkcap; | |
51 | __le16 lnkctl; | |
52 | __le16 lnksta; | |
53 | __le32 slotcap; | |
54 | __le16 slotctl; | |
55 | __le16 slotsta; | |
56 | __le16 rootctl; | |
57 | __le16 rsvd; | |
58 | __le32 rootsta; | |
59 | __le32 devcap2; | |
60 | __le16 devctl2; | |
61 | __le16 devsta2; | |
62 | __le32 lnkcap2; | |
63 | __le16 lnkctl2; | |
64 | __le16 lnksta2; | |
65 | __le32 slotcap2; | |
66 | __le16 slotctl2; | |
67 | __le16 slotsta2; | |
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68 | }; |
69 | ||
70 | struct pci_bridge_emul; | |
71 | ||
72 | typedef enum { PCI_BRIDGE_EMUL_HANDLED, | |
73 | PCI_BRIDGE_EMUL_NOT_HANDLED } pci_bridge_emul_read_status_t; | |
74 | ||
75 | struct pci_bridge_emul_ops { | |
76 | /* | |
77 | * Called when reading from the regular PCI bridge | |
78 | * configuration space. Return PCI_BRIDGE_EMUL_HANDLED when the | |
79 | * operation has handled the read operation and filled in the | |
80 | * *value, or PCI_BRIDGE_EMUL_NOT_HANDLED when the read should | |
81 | * be emulated by the common code by reading from the | |
82 | * in-memory copy of the configuration space. | |
83 | */ | |
84 | pci_bridge_emul_read_status_t (*read_base)(struct pci_bridge_emul *bridge, | |
85 | int reg, u32 *value); | |
86 | ||
87 | /* | |
88 | * Same as ->read_base(), except it is for reading from the | |
89 | * PCIe capability configuration space. | |
90 | */ | |
91 | pci_bridge_emul_read_status_t (*read_pcie)(struct pci_bridge_emul *bridge, | |
92 | int reg, u32 *value); | |
93 | /* | |
94 | * Called when writing to the regular PCI bridge configuration | |
95 | * space. old is the current value, new is the new value being | |
96 | * written, and mask indicates which parts of the value are | |
97 | * being changed. | |
98 | */ | |
99 | void (*write_base)(struct pci_bridge_emul *bridge, int reg, | |
100 | u32 old, u32 new, u32 mask); | |
101 | ||
102 | /* | |
103 | * Same as ->write_base(), except it is for writing from the | |
104 | * PCIe capability configuration space. | |
105 | */ | |
106 | void (*write_pcie)(struct pci_bridge_emul *bridge, int reg, | |
107 | u32 old, u32 new, u32 mask); | |
108 | }; | |
109 | ||
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110 | struct pci_bridge_reg_behavior; |
111 | ||
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112 | struct pci_bridge_emul { |
113 | struct pci_bridge_emul_conf conf; | |
114 | struct pci_bridge_emul_pcie_conf pcie_conf; | |
115 | struct pci_bridge_emul_ops *ops; | |
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116 | struct pci_bridge_reg_behavior *pci_regs_behavior; |
117 | struct pci_bridge_reg_behavior *pcie_cap_regs_behavior; | |
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118 | void *data; |
119 | bool has_pcie; | |
120 | }; | |
121 | ||
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122 | enum { |
123 | PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR = BIT(0), | |
124 | }; | |
125 | ||
126 | int pci_bridge_emul_init(struct pci_bridge_emul *bridge, | |
127 | unsigned int flags); | |
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128 | void pci_bridge_emul_cleanup(struct pci_bridge_emul *bridge); |
129 | ||
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130 | int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where, |
131 | int size, u32 *value); | |
132 | int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where, | |
133 | int size, u32 value); | |
134 | ||
135 | #endif /* __PCI_BRIDGE_EMUL_H__ */ |