cs8900.java

Java Op Processor java vhdl processor

		rx_fifo_errors = 0;

		reset();
	}

/**
*	reset chip and set registers
*/
	public static void reset() {

		int i;

		resetIsa();					// isa reset

		// wait for init
		while((readReg(PP_SelfST) & INIT_DONE) == 0)	// && jiffies - reset_start_time < 2)
			;

		/* get the chip type */
		int rev_type = readReg(PRODUCT_ID_ADD);
		chip_type = rev_type &~ REVISON_BITS;
		chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';

		/* Check the chip type and revision in order to set the correct send command
		CS8920 revision C and CS8900 revision F can use the faster send. */
		send_cmd = TX_AFTER_381;
		if (chip_type == CS8900 && chip_revision >= 'F')
			send_cmd = TX_NOW;
		if (chip_type != CS8900 && chip_revision >= 'C')
			send_cmd = TX_NOW;

		// no int, no mem and don't use iochrdy pin
		writeReg(PP_BusCTL, IO_CHANNEL_READY_ON);
		// set the Ethernet address
		for (i=0; i < 6/2; i++) {
			writeReg(PP_IA+i*2, eth[i*2] | (eth[i*2+1] << 8));
		}
		// default value, 10BASE-T only, disabled rx, tx
		// set LOW_RX_SQUELCH for longer cables
		writeReg(PP_LineCTL, 0);
		// TODO check attached cable
		// Turn on both receive and transmit operations
		writeReg(PP_LineCTL, readReg(PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
	
		// Receive only error free packets addressed to this card 
		// rx_mode = 0;
		writeReg(PP_RxCTL, DEF_RX_ACCEPT);
	
		curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
	
		writeReg(PP_RxCFG, curr_rx_cfg);
	
		writeReg(PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |
			TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);
	
		writeReg(PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |
			TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);
	
		send_underrun = 0;

		// netif_start_queue(dev);
	}

/**
*	Sends a packet to an CS8900 network device.
*	old ret was 0 if ok, now true if ok!
*/
	public static boolean send(Packet p) {
	
	
		/* keep the upload from being interrupted, since we
	                  ask the chip to start transmitting before the
	                  whole packet has been completely uploaded. */
		// spin_lock_irq(&lp->lock);
		// netif_stop_queue(dev);
	
		/* initiate a transmit sequence */
		// writeWord(TX_CMD_PORT, send_cmd);
		writeWord(TX_CMD_PORT, TX_AFTER_ALL);
		writeWord(TX_LEN_PORT, p.len+14);
	
		/* Test to see if the chip has allocated memory for the packet */
		if ((readReg(PP_BusST) & READY_FOR_TX_NOW) == 0) {
			/*
			 * Gasp!  It hasn't.  But that shouldn't happen since
			 * we're waiting for TxOk, so return 1 and requeue this packet.
			 */
			
			// spin_unlock_irq(&lock);
			// if (net_debug) printk("cs89x0: Tx buffer not free!\n");
			// p.setStatus(Packet.FREE);
// or keep it in SND status???
			return false;
		}


		/* Write ethernet header */
		writeHead(p);
		/* Write the contents of the packet */
		writeData(p);
		p.setStatus(Packet.FREE);
		txFree = false;

		// spin_unlock_irq(&lock);
		// dev->trans_start = jiffies;
	
		/*
		 * We DO NOT call netif_wake_queue() here.
		 * We also DO NOT call netif_start_queue().
		 *
		 * Either of these would cause another bottom half run through
		 * net_send_packet() before this packet has fully gone out.  That causes
		 * us to hit the "Gasp!" above and the send is rescheduled.  it runs like
		 * a dog.  We just return and wait for the Tx completion interrupt handler
		 * to restart the netdevice layer
		 */
	
		return true;
	}

	private static final int EVENT_MASK = 0xffc0;

	private static int pollRegs() {

		int event;
		
		event = readReg(PP_RxEvent);
		if ((event & EVENT_MASK)!=0) return event;
		event = readReg(PP_TxEvent);
		if ((event & EVENT_MASK)!=0) return event;
		event = readReg(PP_BufEvent);
		if ((event & EVENT_MASK)!=0) return event;

		return 0;
	}

/**
*	The typical workload of the driver:
*   We have to poll the chip (in 8 Bit mode)!
*/
	   
	public static void poll() {

		int status, mask;
	 
		/* we MUST read all the events out of the ISQ, otherwise we'll never
	           get interrupted again.  As a consequence, we can't have any limit
	           on the number of times we loop in the interrupt handler.  The
	           hardware guarantees that eventually we'll run out of events.  Of
	           course, if you're on a slow machine, and packets are arriving
	           faster than you can read them off, you're screwed.  Hasta la
	           vista, baby!  */
		while ((status = pollRegs()) != 0) {

			mask = status & ISQ_EVENT_MASK;

			if (mask == ISQ_RECEIVER_EVENT) {
				/* Got a packet(s). */
				net_rx();

			} else if (mask == ISQ_TRANSMITTER_EVENT) {
				tx_packets++;
				// netif_wake_queue(dev);	/* Inform upper layers. */
				txFree = true;
				if ((status & (	TX_OK |
						TX_LOST_CRS |
						TX_SQE_ERROR |
						TX_LATE_COL |
						TX_16_COL)) != TX_OK) {
					if ((status & TX_OK) == 0) tx_errors++;
					if ((status & TX_LOST_CRS) != 0) tx_carrier_errors++;
					if ((status & TX_SQE_ERROR) != 0) tx_heartbeat_errors++;
					if ((status & TX_LATE_COL) != 0) tx_window_errors++;
					if ((status & TX_16_COL) != 0) tx_aborted_errors++;
				}

			} else if (mask == ISQ_BUFFER_EVENT) {

				if ((status & READY_FOR_TX) != 0) {
					/* we tried to transmit a packet earlier,
	                                   but inexplicably ran out of buffers.
	                                   That shouldn't happen since we only ever
	                                   load one packet.  Shrug.  Do the right
	                                   thing anyway. */
					// netif_wake_queue(dev);	/* Inform upper layers. */
					txFree = true;
				}
				if ((status & TX_UNDERRUN)!=0) {
					send_underrun++;
					if (send_underrun == 3) send_cmd = TX_AFTER_381;
					else if (send_underrun == 6) send_cmd = TX_AFTER_ALL;
					/* transmit cycle is done, although
					   frame wasn't transmitted - this
					   avoids having to wait for the upper
					   layers to timeout on us, in the
					   event of a tx underrun */
					// netif_wake_queue(dev);	/* Inform upper layers. */
					txFree = true;
				}
			}
/* not used
			case ISQ_RX_MISS_EVENT:
				rx_missed_errors += (status >>6);
				break;
			case ISQ_TX_COL_EVENT:
				collisions += (status >>6);
				break;
			}
*/
		}
	}
	
	private static void count_rx_errors(int status) {

		rx_errors++;
		if ((status & RX_RUNT)!=0) rx_length_errors++;
		if ((status & RX_EXTRA_DATA)!=0) rx_length_errors++;
		if ((status & RX_CRC_ERROR)!=0) if ((status & (RX_EXTRA_DATA|RX_RUNT))==0)
			/* per str 172 */
			rx_crc_errors++;
		if ((status & RX_DRIBBLE)!=0) rx_frame_errors++;
	}
	
	/* We have a good packet(s), get it/them out of the buffers. */
	private static void net_rx() {

		int status, length;
	
		// read high byte first: see AN181
		status = readWordHighFirst(RX_FRAME_PORT);
		length = readWordHighFirst(RX_FRAME_PORT)-14;	// don't count ethernet header
	
		if ((status & RX_OK) == 0) {
			count_rx_errors(status);
			writeReg(PP_RxCFG, curr_rx_cfg | SKIP_1);	// release memory on chip
			return;
		}
	
		Packet p = Packet.getPacket(Packet.FREE, Packet.ALLOC);
		if (p == null) {					// got no free buffer!
Dbg.wr('~');
			rx_dropped++;
			writeReg(PP_RxCFG, curr_rx_cfg | SKIP_1);	// release memory on chip
			return;
		}
	
		p.len = length;	
		// read ethernet header
		readHead(p);
		// read data
		readData(p);
		p.setStatus(Packet.RCV);			// inform upper layer
	
		// netif_rx(skb);
		// dev->last_rx = jiffies;
		rx_packets++;
		rx_bytes += length+14;
	}
	
	
//	/* The inverse routine to net_open(). */
//	static int
//	net_close(struct net_device *dev)
//	{
//		struct net_local *lp = (struct net_local *)dev->priv;
//	
//		netif_stop_queue(dev);
//		
//		writeReg(PP_RxCFG, 0);
//		writeReg(PP_TxCFG, 0);
//		writeReg(PP_BufCFG, 0);
//		writeReg(PP_BusCTL, 0);
//	
//		free_irq(dev->irq, dev);
//	
//		/* Update the statistics here. */
//		return 0;
//	}
//	
//	/* Get the current statistics.	This may be called with the card open or
//	   closed. */
//	static struct net_device_stats *
//	net_get_stats(struct net_device *dev)
//	{
//		struct net_local *lp = (struct net_local *)dev->priv;
//		unsigned long flags;
//	
//		/* Update the statistics from the device registers. */
//		rx_missed_errors += (readReg(PP_RxMiss) >> 6);
//		collisions += (readReg(PP_TxCol) >> 6);
//		spin_unlock_irqrestore(&lock, flags);
//	
//		return &stats;
//	}
//	
//	static void set_multicast_list(struct net_device *dev)
//	{
//		struct net_local *lp = (struct net_local *)dev->priv;
//		unsigned long flags;
//	
//		if(dev->flags&IFF_PROMISC)
//		{
//			rx_mode = RX_ALL_ACCEPT;
//		}
//		else if((dev->flags&IFF_ALLMULTI)||dev->mc_list)
//		{
//			/* The multicast-accept list is initialized to accept-all, and we
//			   rely on higher-level filtering for now. */
//			rx_mode = RX_MULTCAST_ACCEPT;
//		} 
//		else
//			rx_mode = 0;
//	
//		writeReg(PP_RxCTL, DEF_RX_ACCEPT | rx_mode);
//	
//		/* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
//		writeReg(PP_RxCFG, curr_rx_cfg |
//		     (rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
//		spin_unlock_irqrestore(&lock, flags);
//	}
//	
}