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//0、pci子系统首先注册pci bus
struct bus_type pci_bus_type = {
.name = "pci",
.match = pci_bus_match,
.uevent = pci_uevent,
.probe = pci_device_probe,
.remove = pci_device_remove,
.shutdown = pci_device_shutdown,
.dev_groups = pci_dev_groups,
.bus_groups = pci_bus_groups,
.drv_groups = pci_drv_groups,
.pm = PCI_PM_OPS_PTR,
.num_vf = pci_bus_num_vf,
};
EXPORT_SYMBOL(pci_bus_type);
static int __init pci_driver_init(void)
{
return bus_register(&pci_bus_type);
}
postcore_initcall(pci_driver_init);/* 将初始化函数放到内核代码特殊段，内核启动将会自动调用初始化函数 */
/* 设备的枚举流程和设备的驱动的调用过程 */
//1、pci控制器 设备树节点将会配转换成platform device
pcie@3400000 {
compatible = "fsl,ls1021a-pcie", "snps,dw-pcie";
....
｝
//2、pci控制器匹配platform driver
static const struct of_device_id ls_pcie_of_match[] = {
{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
..
}
static struct platform_driver ls_pcie_driver = {
.driver = {
.name = "layerscape-pcie",
.of_match_table = ls_pcie_of_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
//3、执行pci控制器驱动函数ls_pcie_probe函数将被调用，直到pci_bus_type.pci_device_probe被调用
ls_add_pcie_port
pci_bus_add_devices
pci_bus_add_device
device_attach
__device_attach
__device_attach_driver
driver_probe_device
really_probe
dev->bus->probe//将调用pci_bus_type.pci_device_probe
//4、枚举pci设备调用设备驱动
pci_device_probe
__pci_device_probe
pci_call_probe
local_pci_probe
pci_drv->probe//设备的驱动的probe将被调用。