tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * File: portdrv_pci.c
3 * Purpose: PCI Express Port Bus Driver
4 *
5 * Copyright (C) 2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
7 */
8
9#include <linux/module.h>
10#include <linux/pci.h>
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/pm.h>
14#include <linux/init.h>
15#include <linux/pcieport_if.h>
16
17#include "portdrv.h"
18
19/*
20 * Version Information
21 */
22#define DRIVER_VERSION "v1.0"
23#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
24#define DRIVER_DESC "PCIE Port Bus Driver"
25MODULE_AUTHOR(DRIVER_AUTHOR);
26MODULE_DESCRIPTION(DRIVER_DESC);
27MODULE_LICENSE("GPL");
28
29/* global data */
30static const char device_name[] = "pcieport-driver";
31
32static void pci_save_msi_state(struct pci_dev *dev)
33{
34 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
35 int i = 0, pos;
36 u16 control;
37
38 if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
39 return;
40
41 pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
42 control = p_ext->saved_msi_config_space[0] >> 16;
43 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
44 &p_ext->saved_msi_config_space[i++]);
45 if (control & PCI_MSI_FLAGS_64BIT) {
46 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
47 &p_ext->saved_msi_config_space[i++]);
48 pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
49 &p_ext->saved_msi_config_space[i++]);
50 } else
51 pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
52 &p_ext->saved_msi_config_space[i++]);
53 if (control & PCI_MSI_FLAGS_MASKBIT)
54 pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
55 &p_ext->saved_msi_config_space[i++]);
56}
57
58static void pci_restore_msi_state(struct pci_dev *dev)
59{
60 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
61 int i = 0, pos;
62 u16 control;
63
64 if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
65 return;
66
67 control = p_ext->saved_msi_config_space[i++] >> 16;
68 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
69 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
70 p_ext->saved_msi_config_space[i++]);
71 if (control & PCI_MSI_FLAGS_64BIT) {
72 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
73 p_ext->saved_msi_config_space[i++]);
74 pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
75 p_ext->saved_msi_config_space[i++]);
76 } else
77 pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
78 p_ext->saved_msi_config_space[i++]);
79 if (control & PCI_MSI_FLAGS_MASKBIT)
80 pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
81 p_ext->saved_msi_config_space[i++]);
82}
83
84static void pcie_portdrv_save_config(struct pci_dev *dev)
85{
86 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
87
88 pci_save_state(dev);
89 if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
90 pci_save_msi_state(dev);
91}
92
93static int pcie_portdrv_restore_config(struct pci_dev *dev)
94{
95 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
96 int retval;
97
98 pci_restore_state(dev);
99 if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
100 pci_restore_msi_state(dev);
101 retval = pci_enable_device(dev);
102 if (retval)
103 return retval;
104 pci_set_master(dev);
105 return 0;
106}
107
108/*
109 * pcie_portdrv_probe - Probe PCI-Express port devices
110 * @dev: PCI-Express port device being probed
111 *
112 * If detected invokes the pcie_port_device_register() method for
113 * this port device.
114 *
115 */
116static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
117 const struct pci_device_id *id )
118{
119 int status;
120
121 status = pcie_port_device_probe(dev);
122 if (status)
123 return status;
124
125 if (pci_enable_device(dev) < 0)
126 return -ENODEV;
127
128 pci_set_master(dev);
129 if (!dev->irq) {
130 printk(KERN_WARNING
131 "%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
132 __FUNCTION__, dev->device, dev->vendor);
133 }
134 if (pcie_port_device_register(dev))
135 return -ENOMEM;
136
137 return 0;
138}
139
140static void pcie_portdrv_remove (struct pci_dev *dev)
141{
142 pcie_port_device_remove(dev);
143 kfree(pci_get_drvdata(dev));
144}
145
146#ifdef CONFIG_PM
147static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
148{
149 int ret = pcie_port_device_suspend(dev, state);
150
151 pcie_portdrv_save_config(dev);
152 return ret;
153}
154
155static int pcie_portdrv_resume (struct pci_dev *dev)
156{
157 pcie_portdrv_restore_config(dev);
158 return pcie_port_device_resume(dev);
159}
160#endif
161
162/*
163 * LINUX Device Driver Model
164 */
165static const struct pci_device_id port_pci_ids[] = { {
166 /* handle any PCI-Express port */
167 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
168 }, { /* end: all zeroes */ }
169};
170MODULE_DEVICE_TABLE(pci, port_pci_ids);
171
172static struct pci_driver pcie_portdrv = {
173 .name = (char *)device_name,
174 .id_table = &port_pci_ids[0],
175
176 .probe = pcie_portdrv_probe,
177 .remove = pcie_portdrv_remove,
178
179#ifdef CONFIG_PM
180 .suspend = pcie_portdrv_suspend,
181 .resume = pcie_portdrv_resume,
182#endif /* PM */
183};
184
185static int __init pcie_portdrv_init(void)
186{
187 int retval = 0;
188
189 pcie_port_bus_register();
190 retval = pci_register_driver(&pcie_portdrv);
191 if (retval)
192 pcie_port_bus_unregister();
193 return retval;
194}
195
196static void __exit pcie_portdrv_exit(void)
197{
198 pci_unregister_driver(&pcie_portdrv);
199 pcie_port_bus_unregister();
200}
201
202module_init(pcie_portdrv_init);
203module_exit(pcie_portdrv_exit);