dm9000.c

来自「《linux驱动程序设计从入门到精通》一书中所有的程序代码含驱动和相应的应用程序」· C语言 代码 · 共 1,308 行 · 第 1/3 页

	
	/* Re-enable interrupt mask */
	iow(db, DM9000_IMR, IMR_PAR | IMR_PTM | IMR_PRM);
	
	/* Restore previous register address */
	writeb(reg_save, db->io_addr);
	
	spin_unlock(&db->lock);
	
	return IRQ_HANDLED;
}

/*
*  Get statistics from driver.
*/
static struct net_device_stats *
dm9000_get_stats(struct net_device *dev)
{
	board_info_t *db = (board_info_t *) dev->priv;
	return &db->stats;
}


/*
*  A periodic timer routine
*  Dynamic media sense, allocated Rx buffer...
*/
static void
dm9000_timer(unsigned long data)
{
	struct net_device *dev = (struct net_device *) data;
	board_info_t *db = (board_info_t *) dev->priv;
	
	PRINTK3("dm9000_timer()\n");
	
	mii_check_media(&db->mii, netif_msg_link(db), 0);
	
	/* Set timer again */
	db->timer.expires = DM9000_TIMER_WUT;
	add_timer(&db->timer);
}

struct dm9000_rxhdr {
	u16	RxStatus;
	u16	RxLen;
} __attribute__((__packed__));

/*
*  Received a packet and pass to upper layer
*/
static void
dm9000_rx(struct net_device *dev)
{
	board_info_t *db = (board_info_t *) dev->priv;
	struct dm9000_rxhdr rxhdr;
	struct sk_buff *skb;
	u8 rxbyte, *rdptr;
	int GoodPacket;
	int RxLen;
	
	/* Check packet ready or not */
	do {
		ior(db, DM9000_MRCMDX);	/* Dummy read */
		
		/* Get most updated data */
		rxbyte = readb(db->io_data);
		
		/* Status check: this byte must be 0 or 1 */
		if (rxbyte > DM9000_PKT_RDY) {
			printk("status check failed: %d\n", rxbyte);
			iow(db, DM9000_RCR, 0x00);	/* Stop Device */
			iow(db, DM9000_ISR, IMR_PAR);	/* Stop INT request */
			return;
		}
		
		if (rxbyte != DM9000_PKT_RDY)
			return;
		
		/* A packet ready now  & Get status/length */
		GoodPacket = TRUE;
		writeb(DM9000_MRCMD, db->io_addr);
		
		(db->inblk)(db->io_data, &rxhdr, sizeof(rxhdr));
		
		RxLen = rxhdr.RxLen;
		
		/* Packet Status check */
		if (RxLen < 0x40) {
			GoodPacket = FALSE;
			PRINTK1("Bad Packet received (runt)\n");
		}
		
		if (RxLen > DM9000_PKT_MAX) {
			PRINTK1("RST: RX Len:%x\n", RxLen);
		}
		
		if (rxhdr.RxStatus & 0xbf00) {
			GoodPacket = FALSE;
			if (rxhdr.RxStatus & 0x100) {
				PRINTK1("fifo error\n");
				db->stats.rx_fifo_errors++;
			}
			if (rxhdr.RxStatus & 0x200) {
				PRINTK1("crc error\n");
				db->stats.rx_crc_errors++;
			}
			if (rxhdr.RxStatus & 0x8000) {
				PRINTK1("length error\n");
				db->stats.rx_length_errors++;
			}
		}
		
		/* Move data from DM9000 */
		if (GoodPacket
			&& ((skb = dev_alloc_skb(RxLen + 4)) != NULL)) {
			skb->dev = dev;
			skb_reserve(skb, 2);
			rdptr = (u8 *) skb_put(skb, RxLen - 4);
			
			/* Read received packet from RX SRAM */
			
			(db->inblk)(db->io_data, rdptr, RxLen);
			db->stats.rx_bytes += RxLen;
			
			/* Pass to upper layer */
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			db->stats.rx_packets++;
			
		} else {
			/* need to dump the packet's data */
			
			(db->dumpblk)(db->io_data, RxLen);
		}
	} while (rxbyte == DM9000_PKT_RDY);
}

/*
*  Read a word data from SROM
*/
static u16
read_srom_word(board_info_t * db, int offset)
{
	iow(db, DM9000_EPAR, offset);
	iow(db, DM9000_EPCR, EPCR_ERPRR);
	mdelay(8);		/* according to the datasheet 200us should be enough,
	but it doesn't work */
	iow(db, DM9000_EPCR, 0x0);
	return (ior(db, DM9000_EPDRL) + (ior(db, DM9000_EPDRH) << 8));
}

#ifdef DM9000_PROGRAM_EEPROM
/*
* Write a word data to SROM
*/
static void
write_srom_word(board_info_t * db, int offset, u16 val)
{
	iow(db, DM9000_EPAR, offset);
	iow(db, DM9000_EPDRH, ((val >> 8) & 0xff));
	iow(db, DM9000_EPDRL, (val & 0xff));
	iow(db, DM9000_EPCR, EPCR_WEP | EPCR_ERPRW);
	mdelay(8);		/* same shit */
	iow(db, DM9000_EPCR, 0);
}

/*
* Only for development:
* Here we write static data to the eeprom in case
* we don't have valid content on a new board
*/
static void
program_eeprom(board_info_t * db)
{
	u16 eeprom[] = { 0x0c00, 0x007f, 0x1300,	/* MAC Address */
		0x0000,		/* Autoload: accept nothing */
		0x0a46, 0x9000,	/* Vendor / Product ID */
		0x0000,		/* pin control */
		0x0000,
	};			/* Wake-up mode control */
	int i;
	for (i = 0; i < 8; i++)
		write_srom_word(db, i, eeprom[i]);
}
#endif


/*
*  Calculate the CRC valude of the Rx packet
*  flag = 1 : return the reverse CRC (for the received packet CRC)
*         0 : return the normal CRC (for Hash Table index)
*/

static unsigned long
cal_CRC(unsigned char *Data, unsigned int Len, u8 flag)
{
	
	u32 crc = ether_crc_le(Len, Data);
	
	if (flag)
		return ~crc;
	
	return crc;
}

/*
*  Set DM9000 multicast address
*/
static void dm9000_hash_table(struct net_device *dev)
{
	board_info_t *db = (board_info_t *) dev->priv;
	struct dev_mc_list *mcptr = dev->mc_list;
	int mc_cnt = dev->mc_count;
	u32 hash_val;
	u16 i, oft, hash_table[4];
	unsigned long flags;
	
	PRINTK2("dm9000_hash_table()\n");
	
	spin_lock_irqsave(&db->lock,flags);
	
	for (i = 0, oft = 0x10; i < 6; i++, oft++)
		iow(db, oft, dev->dev_addr[i]);
	
	/* Clear Hash Table */
	for (i = 0; i < 4; i++)
		hash_table[i] = 0x0;
	
	/* broadcast address */
	hash_table[3] = 0x8000;
	
	/* the multicast address in Hash Table : 64 bits */
	for (i = 0; i < mc_cnt; i++, mcptr = mcptr->next) {
		hash_val = cal_CRC((char *) mcptr->dmi_addr, 6, 0) & 0x3f;
		hash_table[hash_val / 16] |= (u16) 1 << (hash_val % 16);
	}
	
	/* Write the hash table to MAC MD table */
	for (i = 0, oft = 0x16; i < 4; i++) {
		iow(db, oft++, hash_table[i] & 0xff);
		iow(db, oft++, (hash_table[i] >> 8) & 0xff);
	}
	
	spin_unlock_irqrestore(&db->lock,flags);
}


/*
*   Read a word from phyxcer
*/
static int dm9000_phy_read(struct net_device *dev, int phy_reg_unused, int reg)
{
	board_info_t *db = (board_info_t *) dev->priv;
	unsigned long flags;
	unsigned int reg_save;
	int ret;
	
	spin_lock_irqsave(&db->lock,flags);
	
	/* Save previous register address */
	reg_save = readb(db->io_addr);
	
	/* Fill the phyxcer register into REG_0C */
	iow(db, DM9000_EPAR, DM9000_PHY | reg);
	
	iow(db, DM9000_EPCR, 0xc);	/* Issue phyxcer read command */
	udelay(100);		/* Wait read complete */
	iow(db, DM9000_EPCR, 0x0);	/* Clear phyxcer read command */
	
	/* The read data keeps on REG_0D & REG_0E */
	ret = (ior(db, DM9000_EPDRH) << 8) | ior(db, DM9000_EPDRL);
	
	/* restore the previous address */
	writeb(reg_save, db->io_addr);
	
	spin_unlock_irqrestore(&db->lock,flags);
	
	return ret;
}

/*
*   Write a word to phyxcer
*/
static void dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value)
{
	board_info_t *db = (board_info_t *) dev->priv;
	unsigned long flags;
	unsigned long reg_save;
	
	spin_lock_irqsave(&db->lock,flags);
	
	/* Save previous register address */
	reg_save = readb(db->io_addr);
	
	/* Fill the phyxcer register into REG_0C */
	iow(db, DM9000_EPAR, DM9000_PHY | reg);
	
	/* Fill the written data into REG_0D & REG_0E */
	iow(db, DM9000_EPDRL, (value & 0xff));
	iow(db, DM9000_EPDRH, ((value >> 8) & 0xff));
	
	iow(db, DM9000_EPCR, 0xa);	/* Issue phyxcer write command */
	udelay(500);		/* Wait write complete */
	iow(db, DM9000_EPCR, 0x0);	/* Clear phyxcer write command */
	
	/* restore the previous address */
	writeb(reg_save, db->io_addr);
	
	spin_unlock_irqrestore(&db->lock,flags);
}
/*
static int dm9000_drv_suspend(struct platform_device *dev, pm_message_t state)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	
	if (ndev) {
		if (netif_running(ndev)) {
			netif_device_detach(ndev);
			dm9000_shutdown(ndev);
		}
	}
	return 0;
}

static int
dm9000_drv_resume(struct platform_device *dev)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	board_info_t *db = (board_info_t *) ndev->priv;
	
	if (ndev) {
		
		if (netif_running(ndev)) {
			dm9000_reset(db);
			dm9000_init_dm9000(ndev);
			
			netif_device_attach(ndev);
		}
	}
	return 0;
}
*/
static int dm9000_drv_remove(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct net_device *ndev = dev_get_drvdata(dev);
	
	dev_set_drvdata(dev, NULL);
	
	unregister_netdev(ndev);
	dm9000_release_board(pdev, (board_info_t *) ndev->priv);
	kfree(ndev);		/* free device structure */
	
	PRINTK1("clean_module() exit\n");
	
	return 0;
}
/*
static struct platform_driver dm9000_driver = {
	.driver	= {
		.name    = "dm9000",
			.owner	 = THIS_MODULE,
	},
	.probe   = dm9000_probe,
	.remove  = dm9000_drv_remove,
	.suspend = dm9000_drv_suspend,
	.resume  = dm9000_drv_resume,
};*/


static struct device_driver s3c_device_drive = {
	.name	= "dm9000",
	.bus	= &platform_bus_type,
	.probe	= dm9000_probe,
	.remove = dm9000_drv_remove,
	//.suspend = dm9000_drv_suspend,
	//.resume  = dm9000_drv_resume,
};


static struct resource s3c_resource_dm9000[] = {
	[0] = {
		.start = 0x20000300 + 0x300,
			.end   = 0x20000300 + 0x300 + 0x03,
			.flags = IORESOURCE_MEM
	},
	[1] = {
			.start = 0x20000300 + 0x300 + 0x4,
                .end   = 0x20000300 + 0x300 + 0x4 + 0x7f,
                .flags = IORESOURCE_MEM
    },
     [2] = {
            .start = IRQ_EINT14,
			.end   = IRQ_EINT14,
			.flags = IORESOURCE_IRQ
	}
};
static struct dm9000_plat_data s3c_device_dm9000_platdata = {
	.flags= DM9000_PLATF_16BITONLY
};

struct platform_device s3c_device_dm9000 = {
	.name= "dm9000",
        .id= 0,
        .num_resources= ARRAY_SIZE(s3c_resource_dm9000),
        .resource= s3c_resource_dm9000,
        .dev= {
		.platform_data = &s3c_device_dm9000_platdata,
	}
};



static int __init dm9000_init(void)
{
	 int ret=0;
	printk(KERN_INFO "%s Ethernet Driver\n", CARDNAME);
	platform_device_register(&s3c_device_dm9000);
	ret = driver_register(&s3c_device_drive);
	   return ret;
}

static void __exit dm9000_cleanup(void)
{
//	platform_driver_unregister(&dm9000_driver);
	driver_unregister(&s3c_device_drive);
	platform_device_unregister(&s3c_device_dm9000);
}

module_init(dm9000_init);
module_exit(dm9000_cleanup);

MODULE_AUTHOR("Sascha Hauer, Ben Dooks");
MODULE_DESCRIPTION("Davicom DM9000 network driver");
MODULE_LICENSE("GPL");