r8169.c

linux下从网卡远程启动

static int r8169_poll(struct nic *nic)
{
	/* return true if there's an ethernet packet ready to read */
	/* nic->packet should contain data on return */
	/* nic->packetlen should contain length of data */
	int cur_rx;
	cur_rx = tpc->cur_rx;
	if ((tpc->RxDescArray[cur_rx].status & OWNbit) == 0) {
		if (!(tpc->RxDescArray[cur_rx].status & RxRES)) {
			nic->packetlen = (int) (tpc->RxDescArray[cur_rx].
						status & 0x00001FFF) - 4;
			memcpy(nic->packet, tpc->RxBufferRing[cur_rx],
			       nic->packetlen);
			if (cur_rx == NUM_RX_DESC - 1)
				tpc->RxDescArray[cur_rx].status =
				    (OWNbit | EORbit) + RX_BUF_SIZE;
			else
				tpc->RxDescArray[cur_rx].status =
				    OWNbit + RX_BUF_SIZE;
			tpc->RxDescArray[cur_rx].buf_addr =
			    virt_to_bus(tpc->RxBufferRing[cur_rx]);
		} else
			printf("Error Rx");
		cur_rx = (cur_rx + 1) % NUM_RX_DESC;
		tpc->cur_rx = cur_rx;
		return 1;

	}
	tpc->cur_rx = cur_rx;
	return (0);		/* initially as this is called to flush the input */

}

#define HZ 1000
/**************************************************************************
TRANSMIT - Transmit a frame
***************************************************************************/
static void r8169_transmit(struct nic *nic, const char *d,	/* Destination */
			    unsigned int t,	/* Type */
			    unsigned int s,	/* size */
			    const char *p)
{				/* Packet */
	/* send the packet to destination */

	u16 nstype;
	u32 to;
	u8 *ptxb;
	int entry = tpc->cur_tx % NUM_TX_DESC;

	/* point to the current txb incase multiple tx_rings are used */
	ptxb = tpc->Tx_skbuff[entry * MAX_ETH_FRAME_SIZE];
	memcpy(ptxb, d, ETH_ALEN);
	memcpy(ptxb + ETH_ALEN, nic->node_addr, ETH_ALEN);
	nstype = htons((u16) t);
	memcpy(ptxb + 2 * ETH_ALEN, (u8 *) & nstype, 2);
	memcpy(ptxb + ETH_HLEN, p, s);
	s += ETH_HLEN;
	s &= 0x0FFF;
	while (s < ETH_ZLEN)
		ptxb[s++] = '\0';

	tpc->TxDescArray[entry].buf_addr = virt_to_bus(ptxb);
	if (entry != (NUM_TX_DESC - 1))
		tpc->TxDescArray[entry].status =
		    (OWNbit | FSbit | LSbit) | ((s > ETH_ZLEN) ?
						s : ETH_ZLEN);
	else
		tpc->TxDescArray[entry].status =
		    (OWNbit | EORbit | FSbit | LSbit) |
		    ((s > ETH_ZLEN) ? s : ETH_ZLEN);
	RTL_W8(TxPoll, 0x40);	//set polling bit

	tpc->cur_tx++;
	to = currticks() + TX_TIMEOUT;
	while ((tpc->TxDescArray[entry].status & OWNbit) && (currticks() < to));	/* wait */

	if (currticks() >= to) {
		printf("TX Time Out");
	}
}

static void rtl8169_set_rx_mode(struct nic *nic __unused)
{
	u32 mc_filter[2];	/* Multicast hash filter */
	int rx_mode;
	u32 tmp = 0;

	/* IFF_ALLMULTI */
	/* Too many to filter perfectly -- accept all multicasts. */
	rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
	mc_filter[1] = mc_filter[0] = 0xffffffff;

	tmp =
	    rtl8169_rx_config | rx_mode | (RTL_R32(RxConfig) &
					   rtl_chip_info[tpc->chipset].
					   RxConfigMask);

	RTL_W32(RxConfig, tmp);
	RTL_W32(MAR0 + 0, mc_filter[0]);
	RTL_W32(MAR0 + 4, mc_filter[1]);
}
static void rtl8169_hw_start(struct nic *nic)
{
	u32 i;

	/* Soft reset the chip. */
	RTL_W8(ChipCmd, CmdReset);

	/* Check that the chip has finished the reset. */
	for (i = 1000; i > 0; i--) {
		if ((RTL_R8(ChipCmd) & CmdReset) == 0)
			break;
		else
			udelay(10);
	}

	RTL_W8(Cfg9346, Cfg9346_Unlock);
	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);
	RTL_W8(EarlyTxThres, EarlyTxThld);

	// For gigabit rtl8169
	RTL_W16(RxMaxSize, RxPacketMaxSize);

	// Set Rx Config register
	i = rtl8169_rx_config | (RTL_R32(RxConfig) &
				 rtl_chip_info[tpc->chipset].RxConfigMask);
	RTL_W32(RxConfig, i);

	/* Set DMA burst size and Interframe Gap Time */
	RTL_W32(TxConfig,
		(TX_DMA_BURST << TxDMAShift) | (InterFrameGap <<
						TxInterFrameGapShift));


	tpc->cur_rx = 0;

	RTL_W32(TxDescStartAddr, virt_to_le32desc(tpc->TxDescArray));
	RTL_W32(RxDescStartAddr, virt_to_le32desc(tpc->RxDescArray));
	RTL_W8(Cfg9346, Cfg9346_Lock);
	udelay(10);

	RTL_W32(RxMissed, 0);

	rtl8169_set_rx_mode(nic);

	/* no early-rx interrupts */
	RTL_W16(MultiIntr, RTL_R16(MultiIntr) & 0xF000);
}

static void rtl8169_init_ring(struct nic *nic __unused)
{
	int i;

	tpc->cur_rx = 0;
	tpc->cur_tx = 0;
	tpc->dirty_tx = 0;
	memset(tpc->TxDescArray, 0x0, NUM_TX_DESC * sizeof(struct TxDesc));
	memset(tpc->RxDescArray, 0x0, NUM_RX_DESC * sizeof(struct RxDesc));

	for (i = 0; i < NUM_TX_DESC; i++) {
		tpc->Tx_skbuff[i] = &txb[i];
	}

	for (i = 0; i < NUM_RX_DESC; i++) {
		if (i == (NUM_RX_DESC - 1))
			tpc->RxDescArray[i].status =
			    (OWNbit | EORbit) + RX_BUF_SIZE;
		else
			tpc->RxDescArray[i].status = OWNbit + RX_BUF_SIZE;

		tpc->RxBufferRing[i] = &rxb[i * RX_BUF_SIZE];
		tpc->RxDescArray[i].buf_addr =
		    virt_to_bus(tpc->RxBufferRing[i]);
	}
}

/**************************************************************************
RESET - Finish setting up the ethernet interface
***************************************************************************/
static void r8169_reset(struct nic *nic)
{
	int i;
	u8 diff;
	u32 TxPhyAddr, RxPhyAddr;

	tpc->TxDescArrays = tx_ring; 
	if (tpc->TxDescArrays == 0)
		printf("Allot Error");
	// Tx Desscriptor needs 256 bytes alignment;
	TxPhyAddr = virt_to_bus(tpc->TxDescArrays);
	diff = 256 - (TxPhyAddr - ((TxPhyAddr >> 8) << 8));
	TxPhyAddr += diff;
	tpc->TxDescArray = (struct TxDesc *) (tpc->TxDescArrays + diff);

	tpc->RxDescArrays = rx_ring;
	// Rx Desscriptor needs 256 bytes alignment;
	RxPhyAddr = virt_to_bus(tpc->RxDescArrays);
	diff = 256 - (RxPhyAddr - ((RxPhyAddr >> 8) << 8));
	RxPhyAddr += diff;
	tpc->RxDescArray = (struct RxDesc *) (tpc->RxDescArrays + diff);

	if (tpc->TxDescArrays == NULL || tpc->RxDescArrays == NULL) {
		printf("Allocate RxDescArray or TxDescArray failed\n");
		return;
	}

	rtl8169_init_ring(nic);
	rtl8169_hw_start(nic);
	/* Construct a perfect filter frame with the mac address as first match
	 * and broadcast for all others */
	for (i = 0; i < 192; i++)
		txb[i] = 0xFF;

	txb[0] = nic->node_addr[0];
	txb[1] = nic->node_addr[1];
	txb[2] = nic->node_addr[2];
	txb[3] = nic->node_addr[3];
	txb[4] = nic->node_addr[4];
	txb[5] = nic->node_addr[5];


}

/**************************************************************************
DISABLE - Turn off ethernet interface
***************************************************************************/
static void r8169_disable(struct dev *dev __unused)
{
	int i;
	/* Stop the chip's Tx and Rx DMA processes. */
	RTL_W8(ChipCmd, 0x00);

	/* Disable interrupts by clearing the interrupt mask. */
	RTL_W16(IntrMask, 0x0000);

	RTL_W32(RxMissed, 0);

	tpc->TxDescArrays = NULL;
	tpc->RxDescArrays = NULL;
	tpc->TxDescArray = NULL;
	tpc->RxDescArray = NULL;
	for (i = 0; i < NUM_RX_DESC; i++) {
		tpc->RxBufferRing[i] = NULL;
	}
}

/**************************************************************************
PROBE - Look for an adapter, this routine's visible to the outside
***************************************************************************/

#define board_found 1
#define valid_link 0
static int r8169_probe(struct dev *dev, struct pci_device *pci)
{
	struct nic *nic = (struct nic *) dev;
	static int board_idx = -1;
	static int printed_version = 0;
	int i, rc;
	int option = -1, Cap10_100 = 0, Cap1000 = 0;

	/* BASE is used throughout to address the card */
	printf("\n");
	printf
	    ("r8169.c: %s, %s\n", drv_version, drv_date);
	printf("%s: Probing for Vendor=%hX   Device=%hX, %s\n", pci->name,
	       pci->vendor, pci->dev_id);

	board_idx++;

	printed_version = 1;

	/* point to private storage */
	tpc = &tpx;

	rc = rtl8169_init_board(pci);
	if (rc)
		return rc;

	// Get MAC address.  FIXME: read EEPROM
	for (i = 0; i < MAC_ADDR_LEN; i++)
		nic->node_addr[i] = RTL_R8(MAC0 + i);

	printf("%s: Identified chip type is '%s'.\n", pci->name,
	       rtl_chip_info[tpc->chipset].name);
	/* Print out some hardware info */
	printf("%s%s: %! at ioaddr %hX\n", pci->name, nic->node_addr, ioaddr);

	// if TBI is not endbled
	if (!(RTL_R8(PHYstatus) & TBI_Enable)) {
		int val = mdio_read(PHY_AUTO_NEGO_REG);

		option = (board_idx >= MAX_UNITS) ? 0 : media[board_idx];
		// Force RTL8169 in 10/100/1000 Full/Half mode.
		if (option > 0) {
			printf("%s: Force-mode Enabled.\n", pci->name);
			Cap10_100 = 0, Cap1000 = 0;
			switch (option) {
			case _10_Half:
				Cap10_100 = PHY_Cap_10_Half;
				Cap1000 = PHY_Cap_Null;
				break;
			case _10_Full:
				Cap10_100 = PHY_Cap_10_Full;
				Cap1000 = PHY_Cap_Null;
				break;
			case _100_Half:
				Cap10_100 = PHY_Cap_100_Half;
				Cap1000 = PHY_Cap_Null;
				break;
			case _100_Full:
				Cap10_100 = PHY_Cap_100_Full;
				Cap1000 = PHY_Cap_Null;
				break;
			case _1000_Full:
				Cap10_100 = PHY_Cap_Null;
				Cap1000 = PHY_Cap_1000_Full;
				break;
			default:
				break;
			}
			mdio_write(PHY_AUTO_NEGO_REG, Cap10_100 | (val & 0x1F));	//leave PHY_AUTO_NEGO_REG bit4:0 unchanged
			mdio_write(PHY_1000_CTRL_REG, Cap1000);
		} else {
			printf("%s: Auto-negotiation Enabled.\n",
			       pci->name);

			// enable 10/100 Full/Half Mode, leave PHY_AUTO_NEGO_REG bit4:0 unchanged
			mdio_write(PHY_AUTO_NEGO_REG,
				   PHY_Cap_10_Half | PHY_Cap_10_Full |
				   PHY_Cap_100_Half | PHY_Cap_100_Full |
				   (val & 0x1F));

			// enable 1000 Full Mode
			mdio_write(PHY_1000_CTRL_REG, PHY_Cap_1000_Full);

		}

		// Enable auto-negotiation and restart auto-nigotiation
		mdio_write(PHY_CTRL_REG,
			   PHY_Enable_Auto_Nego | PHY_Restart_Auto_Nego);
		udelay(100);

		// wait for auto-negotiation process
		for (i = 10000; i > 0; i--) {
			//check if auto-negotiation complete
			if (mdio_read(PHY_STAT_REG) & PHY_Auto_Neco_Comp) {
				udelay(100);
				option = RTL_R8(PHYstatus);
				if (option & _1000bpsF) {
					printf
					    ("%s: 1000Mbps Full-duplex operation.\n",
					     pci->name);
				} else {
					printf
					    ("%s: %sMbps %s-duplex operation.\n",
					     pci->name,
					     (option & _100bps) ? "100" :
					     "10",
					     (option & FullDup) ? "Full" :
					     "Half");
				}
				break;
			} else {
				udelay(100);
			}
		}		// end for-loop to wait for auto-negotiation process

	} else {
		udelay(100);
		printf
		    ("%s: 1000Mbps Full-duplex operation, TBI Link %s!\n",
		     pci->name,
		     (RTL_R32(TBICSR) & TBILinkOK) ? "OK" : "Failed");

	}

	r8169_reset(nic);
	/* point to NIC specific routines */
	dev->disable = r8169_disable;
	nic->poll = r8169_poll;
	nic->transmit = r8169_transmit;
	return 1;

}

static struct pci_id r8169_nics[] = {
	PCI_ROM(0x10ec, 0x8169, "r8169", "RealTek RTL8169 Gigabit Ethernet"),
};

static struct pci_driver r8169_driver __pci_driver = {
	.type = NIC_DRIVER,
	.name = "r8169/PCI",
	.probe = r8169_probe,
	.ids = r8169_nics,
	.id_count = sizeof(r8169_nics) / sizeof(r8169_nics[0]),
	.class = 0,
};