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
|
/*
* File: portdrv_pci.c
* Purpose: PCI Express Port Bus Driver
*
* Copyright (C) 2004 Intel
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pcieport_if.h>
#include "portdrv.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
#define DRIVER_DESC "PCIE Port Bus Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/* global data */
static const char device_name[] = "pcieport-driver";
static void pci_save_msi_state(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
int i = 0, pos;
u16 control;
if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
return;
pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
control = p_ext->saved_msi_config_space[0] >> 16;
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
&p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
&p_ext->saved_msi_config_space[i++]);
pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
&p_ext->saved_msi_config_space[i++]);
} else
pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
&p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
&p_ext->saved_msi_config_space[i++]);
}
static void pci_restore_msi_state(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
int i = 0, pos;
u16 control;
if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
return;
control = p_ext->saved_msi_config_space[i++] >> 16;
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
p_ext->saved_msi_config_space[i++]);
pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
p_ext->saved_msi_config_space[i++]);
} else
pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
p_ext->saved_msi_config_space[i++]);
}
static void pcie_portdrv_save_config(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
pci_save_state(dev);
if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
pci_save_msi_state(dev);
}
static int pcie_portdrv_restore_config(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
int retval;
pci_restore_state(dev);
if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
pci_restore_msi_state(dev);
retval = pci_enable_device(dev);
if (retval)
return retval;
pci_set_master(dev);
return 0;
}
/*
* pcie_portdrv_probe - Probe PCI-Express port devices
* @dev: PCI-Express port device being probed
*
* If detected invokes the pcie_port_device_register() method for
* this port device.
*
*/
static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
const struct pci_device_id *id )
{
int status;
status = pcie_port_device_probe(dev);
if (status)
return status;
if (pci_enable_device(dev) < 0)
return -ENODEV;
pci_set_master(dev);
if (!dev->irq) {
printk(KERN_WARNING
"%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
__FUNCTION__, dev->device, dev->vendor);
}
if (pcie_port_device_register(dev))
return -ENOMEM;
return 0;
}
static void pcie_portdrv_remove (struct pci_dev *dev)
{
pcie_port_device_remove(dev);
kfree(pci_get_drvdata(dev));
}
#ifdef CONFIG_PM
static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
{
int ret = pcie_port_device_suspend(dev, state);
pcie_portdrv_save_config(dev);
return ret;
}
static int pcie_portdrv_resume (struct pci_dev *dev)
{
pcie_portdrv_restore_config(dev);
return pcie_port_device_resume(dev);
}
#endif
/*
* LINUX Device Driver Model
*/
static const struct pci_device_id port_pci_ids[] = { {
/* handle any PCI-Express port */
PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, port_pci_ids);
static struct pci_driver pcie_portdrv = {
.name = (char *)device_name,
.id_table = &port_pci_ids[0],
.probe = pcie_portdrv_probe,
.remove = pcie_portdrv_remove,
#ifdef CONFIG_PM
.suspend = pcie_portdrv_suspend,
.resume = pcie_portdrv_resume,
#endif /* PM */
};
static int __init pcie_portdrv_init(void)
{
int retval = 0;
pcie_port_bus_register();
retval = pci_register_driver(&pcie_portdrv);
if (retval)
pcie_port_bus_unregister();
return retval;
}
static void __exit pcie_portdrv_exit(void)
{
pci_unregister_driver(&pcie_portdrv);
pcie_port_bus_unregister();
}
module_init(pcie_portdrv_init);
module_exit(pcie_portdrv_exit);
|
