前言

简单梳理Linux-2-6.23内核，Freescale MPC8548平台初始化及扫描基本流程。 Linux-2-6.23内核，Freescale MPC8548平台PCIE扫描 1.创建控制器host

mpc85xx_cds_setup_arch -- Mpc85xx_cds.c (arch\powerpc\platforms\85xx)
fsl_add_bridge -- Fsl_pci.c (arch\powerpc\sysdev)
pcibios_alloc_controller -- Pci-common.c (arch\powerpc\kernel)	
pci_setup_pci_controller -- Pci-common.c (arch\powerpc\kernel)

2.创建总线bus

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pcibios_init -- Pci_32.c (arch\powerpc\kernel)
pci_scan_bus_parented -- Probe.c (drivers\pci)
pci_create_bus -- Probe.c (drivers\pci)

3.深度扫描设备节点

pci_scan_child_bus -- Probe.c (drivers\pci)
pci_scan_slot -- Probe.c (drivers\pci)
pci_scan_single_device -- Probe.c (drivers\pci)
pci_scan_device -- Probe.c (drivers\pci)
alloc_pci_dev -- Probe.c (drivers\pci) -> 创建pcie设备节点

4.扫描结束创建irq映射关系

pcibios_fixup_bus -- Pci_32.c (arch\powerpc\kernel)
pci_read_irq_line -- Pci-common.c (arch\powerpc\kernel)	12528	2015-12-21
of_irq_map_pci -- Pci-common.c (arch\powerpc\kernel) -> 从设备树获取irq信息
pci_device_to_OF_node -- Pci_32.c (arch\powerpc\kernel)
pci_busdev_to_OF_node -- Pci_32.c (arch\powerpc\kernel)
irq_create_of_mapping -- Irq.c (arch\powerpc\kernel)	-> 创建虚拟irq 即 virq
	/* If host has no translation, then we assume interrupt line */
	if (host->ops->xlate == NULL)
		hwirq = intspec[0];
	virq = irq_create_mapping(host, hwirq)