6 	Written 1993-2000 by Donald Becker.
16 	National Security Agency.  Copyright 1994-2000 retained by the original
17 	author, Donald Becker. The timer-based reset code was supplied in 1995
37 /* The user-configurable values.
58 	This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket
59 	ethernet adapter.  This is a common low-cost OEM pocket ethernet
64 	Vincent Bono of AT-Lan-Tec.	 Ever try to figure out how a complicated
66 	description is written based on guesses and writing lots of special-purpose
84 	The station address is stored in a standard bit-serial EEPROM which must be
87 	using it.)  Unlike built-in devices, a pocket adapter can temporarily lose
104 	(non-register) transfer modes are provided by the adapter, two in each
115 	The data transfer mode is stored in the 'dev->if_port' field.  Its default
116 	value is '4'.  It may be overridden at boot-time using the third parameter
120 	register and data access methods.  These functions are hand-tuned to
158 MODULE_PARM_DESC(debug, "ATP debug level (0-7)");
214    If dev->base_addr == 0, probe all likely locations.
215    If dev->base_addr == 1, always return failure.
216    If dev->base_addr == 2, allocate space for the device and return success
229 		return -ENXIO;  in atp_init()
240 	return -ENODEV;  in atp_init()
297 		return -ENODEV;  in atp_probe1()
302 		return -ENODEV;  in atp_probe1()
307 		return -ENOMEM;  in atp_probe1()
315 		dev->irq = irq[0];  in atp_probe1()
317 		dev->irq = 7;  in atp_probe1()
319 		dev->irq = 5;  in atp_probe1()
323 	dev->base_addr = ioaddr;  in atp_probe1()
335 	       dev->name, dev->base_addr, dev->irq, dev->dev_addr);  in atp_probe1()
337 	/* Reset the ethernet hardware and activate the printer pass-through. */  in atp_probe1()
341 	lp->addr_mode = CMR2h_Normal;  in atp_probe1()
342 	spin_lock_init(&lp->lock);  in atp_probe1()
346 		dev->if_port = xcvr[0];  in atp_probe1()
348 		dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4;  in atp_probe1()
349 	if (dev->mem_end & 0xf)  in atp_probe1()
350 		net_debug = dev->mem_end & 7;  in atp_probe1()
352 	dev->netdev_ops 	= &atp_netdev_ops;  in atp_probe1()
353 	dev->watchdog_timeo	= TX_TIMEOUT;  in atp_probe1()
361 	lp->next_module = root_atp_dev;  in atp_probe1()
367 /* Read the station address PROM, usually a word-wide EEPROM. */
370 	long ioaddr = dev->base_addr;  in get_node_ID()
407 	while (--num_bits >= 0) {  in eeprom_op()
425    there is non-reboot way to recover if something goes wrong.
428    probed for at boot-time, and we need to probe for it again.
435 	/* The interrupt line is turned off (tri-stated) when the device isn't in  in net_open()
438 	ret = request_irq(dev->irq, atp_interrupt, 0, dev->name, dev);  in net_open()
444 	lp->dev = dev;  in net_open()
445 	timer_setup(&lp->timer, atp_timed_checker, 0);  in net_open()
446 	lp->timer.expires = jiffies + TIMED_CHECKER;  in net_open()
447 	add_timer(&lp->timer);  in net_open()
458 	long ioaddr = dev->base_addr;  in hardware_init()
467 		write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);  in hardware_init()
469 	write_reg_high(ioaddr, CMR2, lp->addr_mode);  in hardware_init()
472 		printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name,  in hardware_init()
486 	lp->tx_unit_busy = 0;  in hardware_init()
487 	lp->pac_cnt_in_tx_buf = 0;  in hardware_init()
488 	lp->saved_tx_size = 0;  in hardware_init()
512 		} while (--length > pad_len) ;  in write_packet()
515 		} while (--length > 0) ;  in write_packet()
528 		while (--length > pad_len)  in write_packet()
530 		while (--length > 0)  in write_packet()
540 	long ioaddr = dev->base_addr;  in tx_timeout()
542 	printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name,  in tx_timeout()
545 	dev->stats.tx_errors++;  in tx_timeout()
550 	dev->stats.tx_errors++;  in tx_timeout()
557 	long ioaddr = dev->base_addr;  in atp_send_packet()
561 	length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;  in atp_send_packet()
568 	spin_lock_irqsave(&lp->lock, flags);  in atp_send_packet()
571 	spin_unlock_irqrestore(&lp->lock, flags);  in atp_send_packet()
573 	write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port);  in atp_send_packet()
575 	lp->pac_cnt_in_tx_buf++;  in atp_send_packet()
576 	if (lp->tx_unit_busy == 0) {  in atp_send_packet()
578 		lp->saved_tx_size = 0; 				/* Redundant */  in atp_send_packet()
579 		lp->re_tx = 0;  in atp_send_packet()
580 		lp->tx_unit_busy = 1;  in atp_send_packet()
582 		lp->saved_tx_size = length;  in atp_send_packet()
583 	/* Re-enable the LPT interrupts. */  in atp_send_packet()
603 	ioaddr = dev->base_addr;  in atp_interrupt()
606 	spin_lock(&lp->lock);  in atp_interrupt()
616 		printk(KERN_DEBUG "%s: In interrupt ", dev->name);  in atp_interrupt()
617 	while (--boguscount > 0) {  in atp_interrupt()
632 					dev->stats.rx_over_errors++;  in atp_interrupt()
633 					/* Set to no-accept mode long enough to remove a packet. */  in atp_interrupt()
638 					write_reg_high(ioaddr, CMR2, lp->addr_mode);  in atp_interrupt()
644 			} while (--boguscount > 0);  in atp_interrupt()
653 				dev->stats.collisions++;  in atp_interrupt()
654 				if (++lp->re_tx > 15) {  in atp_interrupt()
655 					dev->stats.tx_aborted_errors++;  in atp_interrupt()
664 				dev->stats.tx_packets++;  in atp_interrupt()
665 				lp->pac_cnt_in_tx_buf--;  in atp_interrupt()
666 				if ( lp->saved_tx_size) {  in atp_interrupt()
667 					trigger_send(ioaddr, lp->saved_tx_size);  in atp_interrupt()
668 					lp->saved_tx_size = 0;  in atp_interrupt()
669 					lp->re_tx = 0;  in atp_interrupt()
671 					lp->tx_unit_busy = 0;  in atp_interrupt()
672 				netif_wake_queue(dev);	/* Inform upper layers. */  in atp_interrupt()
676 			   time_after(jiffies, lp->last_rx_time + HZ)) {  in atp_interrupt()
679 					   "%ld jiffies status %02x  CMR1 %02x.\n", dev->name,  in atp_interrupt()
680 					   num_tx_since_rx, jiffies - lp->last_rx_time, status,  in atp_interrupt()
682 			dev->stats.rx_missed_errors++;  in atp_interrupt()
695 			write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);  in atp_interrupt()
697 		mod_timer(&lp->timer, jiffies + TIMED_CHECKER);  in atp_interrupt()
709 	spin_unlock(&lp->lock);  in atp_interrupt()
721 	struct net_device *dev = lp->dev;  in atp_timed_checker()
722 	long ioaddr = dev->base_addr;  in atp_timed_checker()
723 	int tickssofar = jiffies - lp->last_rx_time;  in atp_timed_checker()
726 	spin_lock(&lp->lock);  in atp_timed_checker()
730 			write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);  in atp_timed_checker()
731 		lp->last_rx_time = jiffies;  in atp_timed_checker()
734 			if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i])  in atp_timed_checker()
737 			write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);  in atp_timed_checker()
739 			  dev->stats.tx_errors++;  in atp_timed_checker()
741 			  dev->stats.tx_dropped++;  in atp_timed_checker()
743 			  dev->stats.collisions++;  in atp_timed_checker()
745 			  dev->stats.rx_errors++;  in atp_timed_checker()
749 	spin_unlock(&lp->lock);  in atp_timed_checker()
750 	lp->timer.expires = jiffies + TIMED_CHECKER;  in atp_timed_checker()
751 	add_timer(&lp->timer);  in atp_timed_checker()
759 	long ioaddr = dev->base_addr;  in net_rx()
764 	read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port);  in net_rx()
769 		dev->stats.rx_errors++;  in net_rx()
770 		if (rx_head.rx_status & 0x0004) dev->stats.rx_frame_errors++;  in net_rx()
771 		else if (rx_head.rx_status & 0x0002) dev->stats.rx_crc_errors++;  in net_rx()
774 				   dev->name, rx_head.rx_status);  in net_rx()
776 			dev->stats.rx_fifo_errors++;  in net_rx()
783 		/* Malloc up new buffer. The "-4" omits the FCS (CRC). */  in net_rx()
784 		int pkt_len = (rx_head.rx_count & 0x7ff) - 4;  in net_rx()
789 			dev->stats.rx_dropped++;  in net_rx()
794 		read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);  in net_rx()
795 		skb->protocol = eth_type_trans(skb, dev);  in net_rx()
797 		dev->stats.rx_packets++;  in net_rx()
798 		dev->stats.rx_bytes += pkt_len;  in net_rx()
802 	lp->last_rx_time = jiffies;  in net_rx()
812 			do { *p++ = read_byte_mode0(ioaddr); } while (--length > 0);  in read_block()
814 			do { *p++ = read_byte_mode2(ioaddr); } while (--length > 0);  in read_block()
817 		do { *p++ = read_byte_mode4(ioaddr); } while (--length > 0);  in read_block()
819 		do { *p++ = read_byte_mode6(ioaddr); } while (--length > 0);  in read_block()
831 	long ioaddr = dev->base_addr;  in net_close()
835 	del_timer_sync(&lp->timer);  in net_close()
838 	lp->addr_mode = CMR2h_OFF;  in net_close()
843 	free_irq(dev->irq, dev);  in net_close()
845 	/* Reset the ethernet hardware and activate the printer pass-through. */  in net_close()
857 	long ioaddr = dev->base_addr;  in set_rx_mode()
859 	if (!netdev_mc_empty(dev) || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC)))  in set_rx_mode()
860 		lp->addr_mode = CMR2h_PROMISC;  in set_rx_mode()
862 		lp->addr_mode = CMR2h_Normal;  in set_rx_mode()
863 	write_reg_high(ioaddr, CMR2, lp->addr_mode);  in set_rx_mode()
877 		next_dev = atp_local->next_module;  in atp_cleanup_module()