1 /* SPDX-License-Identifier: GPL-2.0 */
2 /**
3 * PCI Endpoint *Function* (EPF) header file
4 *
5 * Copyright (C) 2017 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
7 */
8
9 #ifndef __LINUX_PCI_EPF_H
10 #define __LINUX_PCI_EPF_H
11
12 #include <linux/device.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/pci.h>
15
16 struct pci_epf;
17
18 enum pci_barno {
19 BAR_0,
20 BAR_1,
21 BAR_2,
22 BAR_3,
23 BAR_4,
24 BAR_5,
25 };
26
27 /**
28 * struct pci_epf_header - represents standard configuration header
29 * @vendorid: identifies device manufacturer
30 * @deviceid: identifies a particular device
31 * @revid: specifies a device-specific revision identifier
32 * @progif_code: identifies a specific register-level programming interface
33 * @subclass_code: identifies more specifically the function of the device
34 * @baseclass_code: broadly classifies the type of function the device performs
35 * @cache_line_size: specifies the system cacheline size in units of DWORDs
36 * @subsys_vendor_id: vendor of the add-in card or subsystem
37 * @subsys_id: id specific to vendor
38 * @interrupt_pin: interrupt pin the device (or device function) uses
39 */
40 struct pci_epf_header {
41 u16 vendorid;
42 u16 deviceid;
43 u8 revid;
44 u8 progif_code;
45 u8 subclass_code;
46 u8 baseclass_code;
47 u8 cache_line_size;
48 u16 subsys_vendor_id;
49 u16 subsys_id;
50 enum pci_interrupt_pin interrupt_pin;
51 };
52
53 /**
54 * struct pci_epf_ops - set of function pointers for performing EPF operations
55 * @bind: ops to perform when a EPC device has been bound to EPF device
56 * @unbind: ops to perform when a binding has been lost between a EPC device
57 * and EPF device
58 * @linkup: ops to perform when the EPC device has established a connection with
59 * a host system
60 */
61 struct pci_epf_ops {
62 int (*bind)(struct pci_epf *epf);
63 void (*unbind)(struct pci_epf *epf);
64 void (*linkup)(struct pci_epf *epf);
65 };
66
67 /**
68 * struct pci_epf_driver - represents the PCI EPF driver
69 * @probe: ops to perform when a new EPF device has been bound to the EPF driver
70 * @remove: ops to perform when the binding between the EPF device and EPF
71 * driver is broken
72 * @driver: PCI EPF driver
73 * @ops: set of function pointers for performing EPF operations
74 * @owner: the owner of the module that registers the PCI EPF driver
75 * @epf_group: list of configfs group corresponding to the PCI EPF driver
76 * @id_table: identifies EPF devices for probing
77 */
78 struct pci_epf_driver {
79 int (*probe)(struct pci_epf *epf);
80 int (*remove)(struct pci_epf *epf);
81
82 struct device_driver driver;
83 struct pci_epf_ops *ops;
84 struct module *owner;
85 struct list_head epf_group;
86 const struct pci_epf_device_id *id_table;
87 };
88
89 #define to_pci_epf_driver(drv) (container_of((drv), struct pci_epf_driver, \
90 driver))
91
92 /**
93 * struct pci_epf_bar - represents the BAR of EPF device
94 * @phys_addr: physical address that should be mapped to the BAR
95 * @size: the size of the address space present in BAR
96 */
97 struct pci_epf_bar {
98 dma_addr_t phys_addr;
99 size_t size;
100 enum pci_barno barno;
101 int flags;
102 };
103
104 /**
105 * struct pci_epf - represents the PCI EPF device
106 * @dev: the PCI EPF device
107 * @name: the name of the PCI EPF device
108 * @header: represents standard configuration header
109 * @bar: represents the BAR of EPF device
110 * @msi_interrupts: number of MSI interrupts required by this function
111 * @func_no: unique function number within this endpoint device
112 * @epc: the EPC device to which this EPF device is bound
113 * @driver: the EPF driver to which this EPF device is bound
114 * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
115 */
116 struct pci_epf {
117 struct device dev;
118 const char *name;
119 struct pci_epf_header *header;
120 struct pci_epf_bar bar[6];
121 u8 msi_interrupts;
122 u16 msix_interrupts;
123 u8 func_no;
124
125 struct pci_epc *epc;
126 struct pci_epf_driver *driver;
127 struct list_head list;
128 };
129
130 #define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
131
132 #define pci_epf_register_driver(driver) \
133 __pci_epf_register_driver((driver), THIS_MODULE)
134
135 static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
136 {
137 dev_set_drvdata(&epf->dev, data);
138 }
139
140 static inline void *epf_get_drvdata(struct pci_epf *epf)
141 {
142 return dev_get_drvdata(&epf->dev);
143 }
144
145 const struct pci_epf_device_id *
146 pci_epf_match_device(const struct pci_epf_device_id *id, struct pci_epf *epf);
147 struct pci_epf *pci_epf_create(const char *name);
148 void pci_epf_destroy(struct pci_epf *epf);
149 int __pci_epf_register_driver(struct pci_epf_driver *driver,
150 struct module *owner);
151 void pci_epf_unregister_driver(struct pci_epf_driver *driver);
152 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
153 size_t align);
154 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar);
155 int pci_epf_bind(struct pci_epf *epf);
156 void pci_epf_unbind(struct pci_epf *epf);
157 void pci_epf_linkup(struct pci_epf *epf);
158 #endif /* __LINUX_PCI_EPF_H */