pcie驱动 简单框架 -v1

平台: x86 赛扬 E3400

内核版本:Linux linux 3.2.1 #11 SMP Sun Nov 2 13:27:52 CST 2014 i686 i686 i386 GNU/Linux

功能:枚举如下pcie设备，其中8111为PCIE-PCI桥，上行口为PCIE PORT，下行口为PCI PORT

01:00.0 0604: 10b5:8111 (rev 21)

02:04.0 0680: 10b5:86e1 (rev aa)

源码如下:

[email protected]:/study/driver/kobox/src/pcie_frame# cat pcie_drv.c
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>

static struct pci_device_id pci_drv_ids[] =
{
	{PCI_DEVICE(0x10b5, 0x8111), },
	{PCI_DEVICE(0x10b5, 0x86e1), },
	{0, }
};

MODULE_DEVICE_TABLE(pci, pci_drv_ids);

static int pci_drv_probe(struct pci_dev *dev, const struct pci_device_id *d)
{
	int i;
	unsigned uiVal;

	printk("Enter [%s][%d]\n", __FUNCTION__, __LINE__);
	printk("\n*********************************************\n");

	for(i=0; i<0x40; i+=4)
	{
		pci_read_config_dword(dev, i, &uiVal);

		printk("[addr:%03x] [hex:%08x]\n", i, uiVal);
	}	

	printk("\n*********************************************\n");
	printk("Leave [%s][%d]\n", __FUNCTION__, __LINE__);

	return 0;
}

static void pci_drv_remove(struct pci_dev *dev)
{
	return;
}

static struct pci_driver pci_drv_ops =
{
	.name = "pci_drv",
	.id_table = pci_drv_ids,
	.probe = pci_drv_probe,
	.remove = pci_drv_remove,
};

static int __init pci_drv_init(void)
{
	return pci_register_driver(&pci_drv_ops);
}

static void __exit pci_drv_exit(void)
{
	pci_unregister_driver(&pci_drv_ops);
}

module_init(pci_drv_init);
module_exit(pci_drv_exit);

MODULE_LICENSE("GPL");

执行结果:

[ 7539.354646] *********************************************
[ 7539.354653] [addr:000] [hex:811110b5]
[ 7539.354659] [addr:004] [hex:00100007]
[ 7539.354664] [addr:008] [hex:06040021]
[ 7539.354669] [addr:00c] [hex:00010001]
[ 7539.354675] [addr:010] [hex:fddf000c]
[ 7539.354680] [addr:014] [hex:00000000]
[ 7539.354685] [addr:018] [hex:20020201]
[ 7539.354690] [addr:01c] [hex:2200c0c0]
[ 7539.354696] [addr:020] [hex:fde0fde0]
[ 7539.354701] [addr:024] [hex:0000fff0]
[ 7539.354706] [addr:028] [hex:00000000]
[ 7539.354711] [addr:02c] [hex:00000000]
[ 7539.354716] [addr:030] [hex:00000000]
[ 7539.354721] [addr:034] [hex:00000040]
[ 7539.354726] [addr:038] [hex:00000000]
[ 7539.354731] [addr:03c] [hex:0000010c]
[ 7539.354734]
[ 7539.354735] *********************************************
[ 7539.354738] Leave [pci_drv_probe][31]

[ 7539.354765] Enter [pci_drv_probe][20]
[ 7539.354767]
[ 7539.354768] *********************************************
[ 7539.354774] [addr:000] [hex:86e110b5]
[ 7539.354780] [addr:004] [hex:02b00007]
[ 7539.354785] [addr:008] [hex:068000aa]
[ 7539.354790] [addr:00c] [hex:00002001]
[ 7539.354796] [addr:010] [hex:fdeff000]
[ 7539.354801] [addr:014] [hex:0000ce01]
[ 7539.354806] [addr:018] [hex:fdec0000]
[ 7539.354812] [addr:01c] [hex:fdea0000]
[ 7539.354817] [addr:020] [hex:00000000]
[ 7539.354822] [addr:024] [hex:00000000]
[ 7539.354827] [addr:028] [hex:00000000]
[ 7539.354833] [addr:02c] [hex:831110b5]
[ 7539.354838] [addr:030] [hex:00000000]
[ 7539.354843] [addr:034] [hex:00000040]
[ 7539.354849] [addr:038] [hex:00000000]
[ 7539.354854] [addr:03c] [hex:0000010c]
[ 7539.354856]
[ 7539.354857] *********************************************
[ 7539.354861] Leave [pci_drv_probe][31]

关于这个桥到信息，lspci -vx可以查看到:

01:00.0 PCI bridge: PLX Technology, Inc. PEX 8111 PCI Express-to-PCI Bridge (rev 21) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Memory at fddf0000 (64-bit, prefetchable) [size=64K]
	Bus: primary=01, secondary=02, subordinate=02, sec-latency=32
	I/O behind bridge: 0000c000-0000cfff
	Memory behind bridge: fde00000-fdefffff
	Capabilities: [40] Power Management version 2
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
	Capabilities: [60] Express PCI/PCI-X Bridge, MSI 00
	Capabilities: [100] Power Budgeting <?>
	Kernel driver in use: pci_drv
00: b5 10 11 81 07 00 10 00 21 00 04 06 01 00 01 00
10: 0c 00 df fd 00 00 00 00 01 02 02 20 c0 c0 00 22
20: e0 fd e0 fd f0 ff 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 40 00 00 00 00 00 00 00 0c 01 00 00

02:04.0 Bridge: PLX Technology, Inc. Device 86e1 (rev aa)
	Subsystem: PLX Technology, Inc. Device 8311
	Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 12
	Memory at fdeff000 (32-bit, non-prefetchable) [size=512]
	I/O ports at ce00 [size=256]
	Memory at fdec0000 (32-bit, non-prefetchable) [size=128K]
	Memory at fdea0000 (32-bit, non-prefetchable) [size=128K]
	Capabilities: [40] Power Management version 2
	Capabilities: [48] CompactPCI hot-swap <?>
	Capabilities: [4c] Vital Product Data
	Kernel driver in use: pci_drv
00: b5 10 e1 86 07 00 b0 02 aa 00 80 06 01 20 00 00
10: 00 f0 ef fd 01 ce 00 00 00 00 ec fd 00 00 ea fd
20: 00 00 00 00 00 00 00 00 00 00 00 00 b5 10 11 83
30: 00 00 00 00 40 00 00 00 00 00 00 00 0c 01 00 00

可以看到，从驱动中读取到到config配置，和lspci -vx查看到下config区域的配置是相同的