3 * Purpose: PCI Express Port Bus Driver
5 * Copyright (C) 2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/pcieport_if.h>
22 #define DRIVER_VERSION "v1.0"
23 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
24 #define DRIVER_DESC "PCIE Port Bus Driver"
25 MODULE_AUTHOR(DRIVER_AUTHOR);
26 MODULE_DESCRIPTION(DRIVER_DESC);
27 MODULE_LICENSE("GPL");
30 static const char device_name[] = "pcieport-driver";
32 static void pci_save_msi_state(struct pci_dev *dev)
34 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
38 if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
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++]);
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++]);
58 static void pci_restore_msi_state(struct pci_dev *dev)
60 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
64 if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
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++]);
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++]);
84 static void pcie_portdrv_save_config(struct pci_dev *dev)
86 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
89 if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
90 pci_save_msi_state(dev);
93 static int pcie_portdrv_restore_config(struct pci_dev *dev)
95 struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
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);
109 * pcie_portdrv_probe - Probe PCI-Express port devices
110 * @dev: PCI-Express port device being probed
112 * If detected invokes the pcie_port_device_register() method for
116 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
117 const struct pci_device_id *id )
121 status = pcie_port_device_probe(dev);
125 if (pci_enable_device(dev) < 0)
131 "%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
132 __FUNCTION__, dev->device, dev->vendor);
134 if (pcie_port_device_register(dev))
140 static void pcie_portdrv_remove (struct pci_dev *dev)
142 pcie_port_device_remove(dev);
143 kfree(pci_get_drvdata(dev));
147 static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
149 int ret = pcie_port_device_suspend(dev, state);
151 pcie_portdrv_save_config(dev);
155 static int pcie_portdrv_resume (struct pci_dev *dev)
157 pcie_portdrv_restore_config(dev);
158 return pcie_port_device_resume(dev);
163 * LINUX Device Driver Model
165 static 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 */ }
170 MODULE_DEVICE_TABLE(pci, port_pci_ids);
172 static struct pci_driver pcie_portdrv = {
173 .name = (char *)device_name,
174 .id_table = &port_pci_ids[0],
176 .probe = pcie_portdrv_probe,
177 .remove = pcie_portdrv_remove,
180 .suspend = pcie_portdrv_suspend,
181 .resume = pcie_portdrv_resume,
185 static int __init pcie_portdrv_init(void)
189 pcie_port_bus_register();
190 retval = pci_register_driver(&pcie_portdrv);
192 pcie_port_bus_unregister();
196 static void __exit pcie_portdrv_exit(void)
198 pci_unregister_driver(&pcie_portdrv);
199 pcie_port_bus_unregister();
202 module_init(pcie_portdrv_init);
203 module_exit(pcie_portdrv_exit);