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
|
/**
* PCI Endpoint *Controller* (EPC) header file
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*/
#ifndef __LINUX_PCI_EPC_H
#define __LINUX_PCI_EPC_H
#include <linux/pci-epf.h>
struct pci_epc;
enum pci_epc_irq_type {
PCI_EPC_IRQ_UNKNOWN,
PCI_EPC_IRQ_LEGACY,
PCI_EPC_IRQ_MSI,
};
/**
* struct pci_epc_ops - set of function pointers for performing EPC operations
* @write_header: ops to populate configuration space header
* @set_bar: ops to configure the BAR
* @clear_bar: ops to reset the BAR
* @map_addr: ops to map CPU address to PCI address
* @unmap_addr: ops to unmap CPU address and PCI address
* @set_msi: ops to set the requested number of MSI interrupts in the MSI
* capability register
* @get_msi: ops to get the number of MSI interrupts allocated by the RC from
* the MSI capability register
* @raise_irq: ops to raise a legacy or MSI interrupt
* @start: ops to start the PCI link
* @stop: ops to stop the PCI link
* @owner: the module owner containing the ops
*/
struct pci_epc_ops {
int (*write_header)(struct pci_epc *pci_epc,
struct pci_epf_header *hdr);
int (*set_bar)(struct pci_epc *epc, enum pci_barno bar,
dma_addr_t bar_phys, size_t size, int flags);
void (*clear_bar)(struct pci_epc *epc, enum pci_barno bar);
int (*map_addr)(struct pci_epc *epc, phys_addr_t addr,
u64 pci_addr, size_t size);
void (*unmap_addr)(struct pci_epc *epc, phys_addr_t addr);
int (*set_msi)(struct pci_epc *epc, u8 interrupts);
int (*get_msi)(struct pci_epc *epc);
int (*raise_irq)(struct pci_epc *pci_epc,
enum pci_epc_irq_type type, u8 interrupt_num);
int (*start)(struct pci_epc *epc);
void (*stop)(struct pci_epc *epc);
struct module *owner;
};
/**
* struct pci_epc_mem - address space of the endpoint controller
* @phys_base: physical base address of the PCI address space
* @size: the size of the PCI address space
* @bitmap: bitmap to manage the PCI address space
* @pages: number of bits representing the address region
*/
struct pci_epc_mem {
phys_addr_t phys_base;
size_t size;
unsigned long *bitmap;
int pages;
};
/**
* struct pci_epc - represents the PCI EPC device
* @dev: PCI EPC device
* @pci_epf: list of endpoint functions present in this EPC device
* @ops: function pointers for performing endpoint operations
* @mem: address space of the endpoint controller
* @max_functions: max number of functions that can be configured in this EPC
* @group: configfs group representing the PCI EPC device
* @lock: spinlock to protect pci_epc ops
*/
struct pci_epc {
struct device dev;
struct list_head pci_epf;
const struct pci_epc_ops *ops;
struct pci_epc_mem *mem;
u8 max_functions;
struct config_group *group;
/* spinlock to protect against concurrent access of EP controller */
spinlock_t lock;
};
#define to_pci_epc(device) container_of((device), struct pci_epc, dev)
#define pci_epc_create(dev, ops) \
__pci_epc_create((dev), (ops), THIS_MODULE)
#define devm_pci_epc_create(dev, ops) \
__devm_pci_epc_create((dev), (ops), THIS_MODULE)
static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
{
dev_set_drvdata(&epc->dev, data);
}
static inline void *epc_get_drvdata(struct pci_epc *epc)
{
return dev_get_drvdata(&epc->dev);
}
struct pci_epc *
__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
struct module *owner);
struct pci_epc *
__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
struct module *owner);
void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
void pci_epc_destroy(struct pci_epc *epc);
int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
void pci_epc_linkup(struct pci_epc *epc);
void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *hdr);
int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar,
dma_addr_t bar_phys, size_t size, int flags);
void pci_epc_clear_bar(struct pci_epc *epc, int bar);
int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr,
u64 pci_addr, size_t size);
void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr);
int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts);
int pci_epc_get_msi(struct pci_epc *epc);
int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
u8 interrupt_num);
int pci_epc_start(struct pci_epc *epc);
void pci_epc_stop(struct pci_epc *epc);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);
int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size);
void pci_epc_mem_exit(struct pci_epc *epc);
void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
phys_addr_t *phys_addr, size_t size);
void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
void __iomem *virt_addr, size_t size);
#endif /* __LINUX_PCI_EPC_H */
|
