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Tg3 Gbit NIC Driver Analysis
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1, Çý¶¯Ä£¿éµÄ¼ÓÔغÍжÔØ
Èç¹ûÍøÂçÉ豸£¨°üÀ¨wireless£©ÊÇPCI¹æ·¶µÄ£¬ÔòÏÈÊÇÏòÄÚºË×¢²á¸ÃPCIÉ豸(pci_register_driver)£¬È»ºóÓÉpci_driverÊý¾Ý½á¹¹ÖеÄprobeº¯ÊýÖ¸ÕëËùÖ¸ÏòµÄÕì²âº¯ÊýÀ´³õʼ»¯¸ÃPCIÉ豸£¬²¢ÇÒͬʱע²áºÍ³õʼ»¯¸ÃÍøÂçÉ豸¡£
Èç¹ûÍøÂçÉ豸£¨°üÀ¨wireless£©ÊÇPCMCIA¹æ·¶µÄ£¬ÔòÏÈÊÇÏòÄÚºË×¢²á¸ÃPCMCIAÉ豸(register_pccard_driver)£¬È»ºódriver_info_tÊý¾Ý½á¹¹ÖеÄattachº¯ÊýÖ¸ÕëËùÖ¸ÏòµÄÕì²âº¯ÊýÀ´³õʼ»¯¸ÃPCMCIAÉ豸£¬²¢ÇÒͬʱע²áºÍ³õʼ»¯¸ÃÍøÂçÉ豸¡£
static int __init tg3_init(void)
{
//ÏÈ×¢²á³ÉPCIÉ豸£¬²¢³õʼ»¯£¬Èç¹ûÊÇÆäËûµÄESIA£¬PCMCIA£¬ÓÃÆäËûº¯Êý
return pci_module_init(&tg3_driver);
}
static void __exit tg3_cleanup(void)
{
pci_unregister_driver(&tg3_driver);//×¢ÏúPCIÉ豸
}
module_init(tg3_init); //Çý¶¯Ä£¿éµÄ¼ÓÔØ
module_exit(tg3_cleanup); //Çý¶¯Ä£¿éµÄжÔØ
ÉêÃ÷ΪPCIÉ豸£º
static struct pci_driver tg3_driver = {
.name = DRV_MODULE_NAME,
.id_table = tg3_pci_tbl, //´ËÇý¶¯ËùÖ§³ÖµÄÍø¿¨ÏµÁУ¬vendor_id, device_id
.probe = tg3_init_one, //³õʼ»¯ÍøÂçÉ豸µÄ»Øµ÷º¯Êý
.remove = __devexit_p(tg3_remove_one), //×¢ÏúÍøÂçÉ豸µÄ»Øµ÷º¯Êý
.suspend = tg3_suspend, //É豸¹ÒÆðº¯Êý
.resume = tg3_resume //É豸»Ö¸´º¯Êý
};
2£¬PCIÉ豸̽²âº¯Êýprobe£¬³õʼ»¯ÍøÂçÉ豸
static int __devinit tg3_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
//³õʼ»¯É豸£¬Ê¹I/O£¬memory¿ÉÓ㬻½ÐÑÉ豸
pci_enable_device(pdev);
//ÉêÇëÄÚ´æ¿Õ¼ä£¬ÅäÖÃÍø¿¨µÄI/O£¬memory×ÊÔ´
pci_request_regions(pdev, DRV_MODULE_NAME);
pci_set_master(pdev);
//ÉèÖÃDMAÊôÐÔ
pci_set_dma_mask(pdev, (u64) 0xffffffffffffffff);
//Íø¿¨ I/O,memory×ÊÔ´µÄÆôʼµØÖ·
tg3reg_base = pci_resource_start(pdev, 0);
//Íø¿¨I/O,memory×ÊÔ´µÄ´óС
tg3reg_len = pci_resource_len(pdev, 0);
//·ÖÅä²¢ÉèÖÃÍøÂçÉ豸
dev = alloc_etherdev(sizeof(*tp));
//ÉêÃ÷ΪÄÚºËÉ豸ģ¿é
SET_MODULE_OWNER(dev);
//³õʼ»¯Ë½ÓнṹÖеĸ÷³ÉÔ±Öµ
tp = dev->priv
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PCI: bus0: Fast back to back transfers disabled
PCI: Configured XX as a PCI slave with 128MB PCI memory
PCI: Each Region size is 16384KB
PCI: Reserved memory from 0x10080000 to 0x15080000 for DMA and mapped to 0x12000000
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