Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1320 insertions, 0 deletions

diff --git a/drivers/net/declance.c b/drivers/net/declance.c
new file mode 100644
index 0000000..521c831
--- /dev/null
+++ b/drivers/net/declance.c
@@ -0,0 +1,1320 @@
+/*     
+ *    Lance ethernet driver for the MIPS processor based
+ *      DECstation family
+ *
+ *
+ *      adopted from sunlance.c by Richard van den Berg
+ *
+ *      Copyright (C) 2002, 2003  Maciej W. Rozycki
+ *
+ *      additional sources:
+ *      - PMAD-AA TURBOchannel Ethernet Module Functional Specification,
+ *        Revision 1.2
+ *
+ *      History:
+ *
+ *      v0.001: The kernel accepts the code and it shows the hardware address.
+ *
+ *      v0.002: Removed most sparc stuff, left only some module and dma stuff.
+ *
+ *      v0.003: Enhanced base address calculation from proposals by
+ *              Harald Koerfgen and Thomas Riemer.
+ *
+ *      v0.004: lance-regs is pointing at the right addresses, added prom
+ *              check. First start of address mapping and DMA.
+ *
+ *      v0.005: started to play around with LANCE-DMA. This driver will not
+ *              work for non IOASIC lances. HK
+ *
+ *      v0.006: added pointer arrays to lance_private and setup routine for
+ *              them in dec_lance_init. HK
+ *
+ *      v0.007: Big shit. The LANCE seems to use a different DMA mechanism to
+ *              access the init block. This looks like one (short) word at a
+ *              time, but the smallest amount the IOASIC can transfer is a
+ *              (long) word. So we have a 2-2 padding here. Changed
+ *              lance_init_block accordingly. The 16-16 padding for the buffers
+ *              seems to be correct. HK
+ *
+ *      v0.008: mods to make PMAX_LANCE work. 01/09/1999 triemer
+ *
+ *      v0.009: Module support fixes, multiple interfaces support, various
+ *              bits. macro
+ */
+
+#include <linux/config.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/if_ether.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/spinlock.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+
+#include <asm/addrspace.h>
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/tc.h>
+#include <asm/system.h>
+
+static char version[] __devinitdata =
+"declance.c: v0.009 by Linux MIPS DECstation task force\n";
+
+MODULE_AUTHOR("Linux MIPS DECstation task force");
+MODULE_DESCRIPTION("DEC LANCE (DECstation onboard, PMAD-xx) driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * card types
+ */
+#define ASIC_LANCE 1
+#define PMAD_LANCE 2
+#define PMAX_LANCE 3
+
+#ifndef CONFIG_TC
+unsigned long system_base;
+unsigned long dmaptr;
+#endif
+
+#define LE_CSR0 0
+#define LE_CSR1 1
+#define LE_CSR2 2
+#define LE_CSR3 3
+
+#define LE_MO_PROM      0x8000	/* Enable promiscuous mode */
+
+#define	LE_C0_ERR	0x8000	/* Error: set if BAB, SQE, MISS or ME is set */
+#define	LE_C0_BABL	0x4000	/* BAB:  Babble: tx timeout. */
+#define	LE_C0_CERR	0x2000	/* SQE:  Signal quality error */
+#define	LE_C0_MISS	0x1000	/* MISS: Missed a packet */
+#define	LE_C0_MERR	0x0800	/* ME:   Memory error */
+#define	LE_C0_RINT	0x0400	/* Received interrupt */
+#define	LE_C0_TINT	0x0200	/* Transmitter Interrupt */
+#define	LE_C0_IDON	0x0100	/* IFIN: Init finished. */
+#define	LE_C0_INTR	0x0080	/* Interrupt or error */
+#define	LE_C0_INEA	0x0040	/* Interrupt enable */
+#define	LE_C0_RXON	0x0020	/* Receiver on */
+#define	LE_C0_TXON	0x0010	/* Transmitter on */
+#define	LE_C0_TDMD	0x0008	/* Transmitter demand */
+#define	LE_C0_STOP	0x0004	/* Stop the card */
+#define	LE_C0_STRT	0x0002	/* Start the card */
+#define	LE_C0_INIT	0x0001	/* Init the card */
+
+#define	LE_C3_BSWP	0x4	/* SWAP */
+#define	LE_C3_ACON	0x2	/* ALE Control */
+#define	LE_C3_BCON	0x1	/* Byte control */
+
+/* Receive message descriptor 1 */
+#define LE_R1_OWN       0x80	/* Who owns the entry */
+#define LE_R1_ERR       0x40	/* Error: if FRA, OFL, CRC or BUF is set */
+#define LE_R1_FRA       0x20	/* FRA: Frame error */
+#define LE_R1_OFL       0x10	/* OFL: Frame overflow */
+#define LE_R1_CRC       0x08	/* CRC error */
+#define LE_R1_BUF       0x04	/* BUF: Buffer error */
+#define LE_R1_SOP       0x02	/* Start of packet */
+#define LE_R1_EOP       0x01	/* End of packet */
+#define LE_R1_POK       0x03	/* Packet is complete: SOP + EOP */
+
+#define LE_T1_OWN       0x80	/* Lance owns the packet */
+#define LE_T1_ERR       0x40	/* Error summary */
+#define LE_T1_EMORE     0x10	/* Error: more than one retry needed */
+#define LE_T1_EONE      0x08	/* Error: one retry needed */
+#define LE_T1_EDEF      0x04	/* Error: deferred */
+#define LE_T1_SOP       0x02	/* Start of packet */
+#define LE_T1_EOP       0x01	/* End of packet */
+#define LE_T1_POK	0x03	/* Packet is complete: SOP + EOP */
+
+#define LE_T3_BUF       0x8000	/* Buffer error */
+#define LE_T3_UFL       0x4000	/* Error underflow */
+#define LE_T3_LCOL      0x1000	/* Error late collision */
+#define LE_T3_CLOS      0x0800	/* Error carrier loss */
+#define LE_T3_RTY       0x0400	/* Error retry */
+#define LE_T3_TDR       0x03ff	/* Time Domain Reflectometry counter */
+
+/* Define: 2^4 Tx buffers and 2^4 Rx buffers */
+
+#ifndef LANCE_LOG_TX_BUFFERS
+#define LANCE_LOG_TX_BUFFERS 4
+#define LANCE_LOG_RX_BUFFERS 4
+#endif
+
+#define TX_RING_SIZE			(1 << (LANCE_LOG_TX_BUFFERS))
+#define TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
+
+#define RX_RING_SIZE			(1 << (LANCE_LOG_RX_BUFFERS))
+#define RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
+
+#define PKT_BUF_SZ		1536
+#define RX_BUFF_SIZE            PKT_BUF_SZ
+#define TX_BUFF_SIZE            PKT_BUF_SZ
+
+#undef TEST_HITS
+#define ZERO 0
+
+/* The DS2000/3000 have a linear 64 KB buffer.
+
+ * The PMAD-AA has 128 kb buffer on-board. 
+ *
+ * The IOASIC LANCE devices use a shared memory region. This region as seen 
+ * from the CPU is (max) 128 KB long and has to be on an 128 KB boundary.
+ * The LANCE sees this as a 64 KB long continuous memory region.
+ *
+ * The LANCE's DMA address is used as an index in this buffer and DMA takes
+ * place in bursts of eight 16-Bit words which are packed into four 32-Bit words
+ * by the IOASIC. This leads to a strange padding: 16 bytes of valid data followed
+ * by a 16 byte gap :-(.
+ */
+
+struct lance_rx_desc {
+	unsigned short rmd0;		/* low address of packet */
+	short gap0;
+	unsigned char rmd1_hadr;	/* high address of packet */
+	unsigned char rmd1_bits;	/* descriptor bits */
+	short gap1;
+	short length;			/* 2s complement (negative!)
+					   of buffer length */
+	short gap2;
+	unsigned short mblength;	/* actual number of bytes received */
+	short gap3;
+};
+
+struct lance_tx_desc {
+	unsigned short tmd0;		/* low address of packet */
+	short gap0;
+	unsigned char tmd1_hadr;	/* high address of packet */
+	unsigned char tmd1_bits;	/* descriptor bits */
+	short gap1;
+	short length;			/* 2s complement (negative!)
+					   of buffer length */
+	short gap2;
+	unsigned short misc;
+	short gap3;
+};
+
+
+/* First part of the LANCE initialization block, described in databook. */
+struct lance_init_block {
+	unsigned short mode;		/* pre-set mode (reg. 15) */
+	short gap0;
+
+	unsigned char phys_addr[12];	/* physical ethernet address
+					   only 0, 1, 4, 5, 8, 9 are valid
+					   2, 3, 6, 7, 10, 11 are gaps */
+	unsigned short filter[8];	/* multicast filter
+					   only 0, 2, 4, 6 are valid
+					   1, 3, 5, 7 are gaps */
+
+	/* Receive and transmit ring base, along with extra bits. */
+	unsigned short rx_ptr;		/* receive descriptor addr */
+	short gap1;
+	unsigned short rx_len;		/* receive len and high addr */
+	short gap2;
+	unsigned short tx_ptr;		/* transmit descriptor addr */
+	short gap3;
+	unsigned short tx_len;		/* transmit len and high addr */
+	short gap4;
+	short gap5[8];
+
+	/* The buffer descriptors */
+	struct lance_rx_desc brx_ring[RX_RING_SIZE];
+	struct lance_tx_desc btx_ring[TX_RING_SIZE];
+};
+
+#define BUF_OFFSET_CPU sizeof(struct lance_init_block)
+#define BUF_OFFSET_LNC (sizeof(struct lance_init_block)>>1)
+
+#define libdesc_offset(rt, elem) \
+((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem])))))
+
+/*
+ * This works *only* for the ring descriptors
+ */
+#define LANCE_ADDR(x) (PHYSADDR(x) >> 1)
+
+struct lance_private {
+	struct net_device *next;
+	int type;
+	int slot;
+	int dma_irq;
+	volatile struct lance_regs *ll;
+	volatile struct lance_init_block *init_block;
+
+	spinlock_t	lock;
+
+	int rx_new, tx_new;
+	int rx_old, tx_old;
+
+	struct net_device_stats stats;
+
+	unsigned short busmaster_regval;
+
+	struct timer_list       multicast_timer;
+
+	/* Pointers to the ring buffers as seen from the CPU */
+	char *rx_buf_ptr_cpu[RX_RING_SIZE];
+	char *tx_buf_ptr_cpu[TX_RING_SIZE];
+
+	/* Pointers to the ring buffers as seen from the LANCE */
+	char *rx_buf_ptr_lnc[RX_RING_SIZE];
+	char *tx_buf_ptr_lnc[TX_RING_SIZE];
+};
+
+#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
+			lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
+			lp->tx_old - lp->tx_new-1)
+
+/* The lance control ports are at an absolute address, machine and tc-slot
+ * dependent.
+ * DECstations do only 32-bit access and the LANCE uses 16 bit addresses,
+ * so we have to give the structure an extra member making rap pointing
+ * at the right address
+ */
+struct lance_regs {
+	volatile unsigned short rdp;	/* register data port */
+	unsigned short pad;
+	volatile unsigned short rap;	/* register address port */
+};
+
+int dec_lance_debug = 2;
+
+static struct net_device *root_lance_dev;
+
+static inline void writereg(volatile unsigned short *regptr, short value)
+{
+	*regptr = value;
+	iob();
+}
+
+/* Load the CSR registers */
+static void load_csrs(struct lance_private *lp)
+{
+	volatile struct lance_regs *ll = lp->ll;
+	int leptr;
+
+	/* The address space as seen from the LANCE
+	 * begins at address 0. HK
+	 */
+	leptr = 0;
+
+	writereg(&ll->rap, LE_CSR1);
+	writereg(&ll->rdp, (leptr & 0xFFFF));
+	writereg(&ll->rap, LE_CSR2);
+	writereg(&ll->rdp, leptr >> 16);
+	writereg(&ll->rap, LE_CSR3);
+	writereg(&ll->rdp, lp->busmaster_regval);
+
+	/* Point back to csr0 */
+	writereg(&ll->rap, LE_CSR0);
+}
+
+/*
+ * Our specialized copy routines
+ *
+ */
+void cp_to_buf(const int type, void *to, const void *from, int len)
+{
+	unsigned short *tp, *fp, clen;
+	unsigned char *rtp, *rfp;
+
+	if (type == PMAX_LANCE) {
+		clen = len >> 1;
+		tp = (unsigned short *) to;
+		fp = (unsigned short *) from;
+
+		while (clen--) {
+			*tp++ = *fp++;
+			tp++;
+		}
+
+		clen = len & 1;
+		rtp = (unsigned char *) tp;
+		rfp = (unsigned char *) fp;
+		while (clen--) {
+			*rtp++ = *rfp++;
+		}
+	} else {
+		/*
+		 * copy 16 Byte chunks
+		 */
+		clen = len >> 4;
+		tp = (unsigned short *) to;
+		fp = (unsigned short *) from;
+		while (clen--) {
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			tp += 8;
+		}
+
+		/*
+		 * do the rest, if any.
+		 */
+		clen = len & 15;
+		rtp = (unsigned char *) tp;
+		rfp = (unsigned char *) fp;
+		while (clen--) {
+			*rtp++ = *rfp++;
+		}
+	}
+
+	iob();
+}
+
+void cp_from_buf(const int type, void *to, const void *from, int len)
+{
+	unsigned short *tp, *fp, clen;
+	unsigned char *rtp, *rfp;
+
+	if (type == PMAX_LANCE) {
+		clen = len >> 1;
+		tp = (unsigned short *) to;
+		fp = (unsigned short *) from;
+		while (clen--) {
+			*tp++ = *fp++;
+			fp++;
+		}
+
+		clen = len & 1;
+
+		rtp = (unsigned char *) tp;
+		rfp = (unsigned char *) fp;
+
+		while (clen--) {
+			*rtp++ = *rfp++;
+		}
+	} else {
+
+		/*
+		 * copy 16 Byte chunks
+		 */
+		clen = len >> 4;
+		tp = (unsigned short *) to;
+		fp = (unsigned short *) from;
+		while (clen--) {
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			*tp++ = *fp++;
+			fp += 8;
+		}
+
+		/*
+		 * do the rest, if any.
+		 */
+		clen = len & 15;
+		rtp = (unsigned char *) tp;
+		rfp = (unsigned char *) fp;
+		while (clen--) {
+			*rtp++ = *rfp++;
+		}
+
+
+	}
+
+}
+
+/* Setup the Lance Rx and Tx rings */
+static void lance_init_ring(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_init_block *ib;
+	int leptr;
+	int i;
+
+	ib = (struct lance_init_block *) (dev->mem_start);
+
+	/* Lock out other processes while setting up hardware */
+	netif_stop_queue(dev);
+	lp->rx_new = lp->tx_new = 0;
+	lp->rx_old = lp->tx_old = 0;
+
+	/* Copy the ethernet address to the lance init block.
+	 * XXX bit 0 of the physical address registers has to be zero
+	 */
+	ib->phys_addr[0] = dev->dev_addr[0];
+	ib->phys_addr[1] = dev->dev_addr[1];
+	ib->phys_addr[4] = dev->dev_addr[2];
+	ib->phys_addr[5] = dev->dev_addr[3];
+	ib->phys_addr[8] = dev->dev_addr[4];
+	ib->phys_addr[9] = dev->dev_addr[5];
+	/* Setup the initialization block */
+
+	/* Setup rx descriptor pointer */
+	leptr = LANCE_ADDR(libdesc_offset(brx_ring, 0));
+	ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);
+	ib->rx_ptr = leptr;
+	if (ZERO)
+		printk("RX ptr: %8.8x(%8.8x)\n", leptr, libdesc_offset(brx_ring, 0));
+
+	/* Setup tx descriptor pointer */
+	leptr = LANCE_ADDR(libdesc_offset(btx_ring, 0));
+	ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);
+	ib->tx_ptr = leptr;
+	if (ZERO)
+		printk("TX ptr: %8.8x(%8.8x)\n", leptr, libdesc_offset(btx_ring, 0));
+
+	if (ZERO)
+		printk("TX rings:\n");
+
+	/* Setup the Tx ring entries */
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		leptr = (int) lp->tx_buf_ptr_lnc[i];
+		ib->btx_ring[i].tmd0 = leptr;
+		ib->btx_ring[i].tmd1_hadr = leptr >> 16;
+		ib->btx_ring[i].tmd1_bits = 0;
+		ib->btx_ring[i].length = 0xf000;	/* The ones required by tmd2 */
+		ib->btx_ring[i].misc = 0;
+		if (i < 3 && ZERO)
+			printk("%d: 0x%8.8x(0x%8.8x)\n", i, leptr, (int) lp->tx_buf_ptr_cpu[i]);
+	}
+
+	/* Setup the Rx ring entries */
+	if (ZERO)
+		printk("RX rings:\n");
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		leptr = (int) lp->rx_buf_ptr_lnc[i];
+		ib->brx_ring[i].rmd0 = leptr;
+		ib->brx_ring[i].rmd1_hadr = leptr >> 16;
+		ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
+		ib->brx_ring[i].length = -RX_BUFF_SIZE | 0xf000;
+		ib->brx_ring[i].mblength = 0;
+		if (i < 3 && ZERO)
+			printk("%d: 0x%8.8x(0x%8.8x)\n", i, leptr, (int) lp->rx_buf_ptr_cpu[i]);
+	}
+	iob();
+}
+
+static int init_restart_lance(struct lance_private *lp)
+{
+	volatile struct lance_regs *ll = lp->ll;
+	int i;
+
+	writereg(&ll->rap, LE_CSR0);
+	writereg(&ll->rdp, LE_C0_INIT);
+
+	/* Wait for the lance to complete initialization */
+	for (i = 0; (i < 100) && !(ll->rdp & LE_C0_IDON); i++) {
+		udelay(10);
+	}
+	if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
+		printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);
+		return -1;
+	}
+	if ((ll->rdp & LE_C0_ERR)) {
+		printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);
+		return -1;
+	}
+	writereg(&ll->rdp, LE_C0_IDON);
+	writereg(&ll->rdp, LE_C0_STRT);
+	writereg(&ll->rdp, LE_C0_INEA);
+
+	return 0;
+}
+
+static int lance_rx(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_init_block *ib;
+	volatile struct lance_rx_desc *rd = 0;
+	unsigned char bits;
+	int len = 0;
+	struct sk_buff *skb = 0;
+	ib = (struct lance_init_block *) (dev->mem_start);
+
+#ifdef TEST_HITS
+	{
+		int i;
+
+		printk("[");
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			if (i == lp->rx_new)
+				printk("%s", ib->brx_ring[i].rmd1_bits &
+					     LE_R1_OWN ? "_" : "X");
+			else
+				printk("%s", ib->brx_ring[i].rmd1_bits &
+					     LE_R1_OWN ? "." : "1");
+		}
+		printk("]");
+	}
+#endif
+
+	for (rd = &ib->brx_ring[lp->rx_new];
+	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
+	     rd = &ib->brx_ring[lp->rx_new]) {
+
+		/* We got an incomplete frame? */
+		if ((bits & LE_R1_POK) != LE_R1_POK) {
+			lp->stats.rx_over_errors++;
+			lp->stats.rx_errors++;
+		} else if (bits & LE_R1_ERR) {
+			/* Count only the end frame as a rx error,
+			 * not the beginning
+			 */
+			if (bits & LE_R1_BUF)
+				lp->stats.rx_fifo_errors++;
+			if (bits & LE_R1_CRC)
+				lp->stats.rx_crc_errors++;
+			if (bits & LE_R1_OFL)
+				lp->stats.rx_over_errors++;
+			if (bits & LE_R1_FRA)
+				lp->stats.rx_frame_errors++;
+			if (bits & LE_R1_EOP)
+				lp->stats.rx_errors++;
+		} else {
+			len = (rd->mblength & 0xfff) - 4;
+			skb = dev_alloc_skb(len + 2);
+
+			if (skb == 0) {
+				printk("%s: Memory squeeze, deferring packet.\n",
+				       dev->name);
+				lp->stats.rx_dropped++;
+				rd->mblength = 0;
+				rd->rmd1_bits = LE_R1_OWN;
+				lp->rx_new = (lp->rx_new + 1) & RX_RING_MOD_MASK;
+				return 0;
+			}
+			lp->stats.rx_bytes += len;
+
+			skb->dev = dev;
+			skb_reserve(skb, 2);	/* 16 byte align */
+			skb_put(skb, len);	/* make room */
+
+			cp_from_buf(lp->type, skb->data,
+				    (char *)lp->rx_buf_ptr_cpu[lp->rx_new],
+				    len);
+
+			skb->protocol = eth_type_trans(skb, dev);
+			netif_rx(skb);
+			dev->last_rx = jiffies;
+			lp->stats.rx_packets++;
+		}
+
+		/* Return the packet to the pool */
+		rd->mblength = 0;
+		rd->length = -RX_BUFF_SIZE | 0xf000;
+		rd->rmd1_bits = LE_R1_OWN;
+		lp->rx_new = (lp->rx_new + 1) & RX_RING_MOD_MASK;
+	}
+	return 0;
+}
+
+static void lance_tx(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_init_block *ib;
+	volatile struct lance_regs *ll = lp->ll;
+	volatile struct lance_tx_desc *td;
+	int i, j;
+	int status;
+	ib = (struct lance_init_block *) (dev->mem_start);
+	j = lp->tx_old;
+
+	spin_lock(&lp->lock);
+
+	for (i = j; i != lp->tx_new; i = j) {
+		td = &ib->btx_ring[i];
+		/* If we hit a packet not owned by us, stop */
+		if (td->tmd1_bits & LE_T1_OWN)
+			break;
+
+		if (td->tmd1_bits & LE_T1_ERR) {
+			status = td->misc;
+
+			lp->stats.tx_errors++;
+			if (status & LE_T3_RTY)
+				lp->stats.tx_aborted_errors++;
+			if (status & LE_T3_LCOL)
+				lp->stats.tx_window_errors++;
+
+			if (status & LE_T3_CLOS) {
+				lp->stats.tx_carrier_errors++;
+				printk("%s: Carrier Lost\n", dev->name);
+				/* Stop the lance */
+				writereg(&ll->rap, LE_CSR0);
+				writereg(&ll->rdp, LE_C0_STOP);
+				lance_init_ring(dev);
+				load_csrs(lp);
+				init_restart_lance(lp);
+				goto out;
+			}
+			/* Buffer errors and underflows turn off the
+			 * transmitter, restart the adapter.
+			 */
+			if (status & (LE_T3_BUF | LE_T3_UFL)) {
+				lp->stats.tx_fifo_errors++;
+
+				printk("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
+				       dev->name);
+				/* Stop the lance */
+				writereg(&ll->rap, LE_CSR0);
+				writereg(&ll->rdp, LE_C0_STOP);
+				lance_init_ring(dev);
+				load_csrs(lp);
+				init_restart_lance(lp);
+				goto out;
+			}
+		} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
+			/*
+			 * So we don't count the packet more than once.
+			 */
+			td->tmd1_bits &= ~(LE_T1_POK);
+
+			/* One collision before packet was sent. */
+			if (td->tmd1_bits & LE_T1_EONE)
+				lp->stats.collisions++;
+
+			/* More than one collision, be optimistic. */
+			if (td->tmd1_bits & LE_T1_EMORE)
+				lp->stats.collisions += 2;
+
+			lp->stats.tx_packets++;
+		}
+		j = (j + 1) & TX_RING_MOD_MASK;
+	}
+	lp->tx_old = j;
+out:
+	if (netif_queue_stopped(dev) &&
+	    TX_BUFFS_AVAIL > 0)
+		netif_wake_queue(dev);
+
+	spin_unlock(&lp->lock);
+}
+
+static void lance_dma_merr_int(const int irq, void *dev_id,
+				struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+
+	printk("%s: DMA error\n", dev->name);
+}
+
+static irqreturn_t
+lance_interrupt(const int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_regs *ll = lp->ll;
+	int csr0;
+
+	writereg(&ll->rap, LE_CSR0);
+	csr0 = ll->rdp;
+
+	/* Acknowledge all the interrupt sources ASAP */
+	writereg(&ll->rdp, csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT));
+
+	if ((csr0 & LE_C0_ERR)) {
+		/* Clear the error condition */
+		writereg(&ll->rdp, LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
+			 LE_C0_CERR | LE_C0_MERR);
+	}
+	if (csr0 & LE_C0_RINT)
+		lance_rx(dev);
+
+	if (csr0 & LE_C0_TINT)
+		lance_tx(dev);
+
+	if (csr0 & LE_C0_BABL)
+		lp->stats.tx_errors++;
+
+	if (csr0 & LE_C0_MISS)
+		lp->stats.rx_errors++;
+
+	if (csr0 & LE_C0_MERR) {
+		printk("%s: Memory error, status %04x\n", dev->name, csr0);
+
+		writereg(&ll->rdp, LE_C0_STOP);
+
+		lance_init_ring(dev);
+		load_csrs(lp);
+		init_restart_lance(lp);
+		netif_wake_queue(dev);
+	}
+
+	writereg(&ll->rdp, LE_C0_INEA);
+	writereg(&ll->rdp, LE_C0_INEA);
+	return IRQ_HANDLED;
+}
+
+struct net_device *last_dev = 0;
+
+static int lance_open(struct net_device *dev)
+{
+	volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_regs *ll = lp->ll;
+	int status = 0;
+
+	last_dev = dev;
+
+	/* Stop the Lance */
+	writereg(&ll->rap, LE_CSR0);
+	writereg(&ll->rdp, LE_C0_STOP);
+
+	/* Set mode and clear multicast filter only at device open,
+	 * so that lance_init_ring() called at any error will not
+	 * forget multicast filters.
+	 *
+	 * BTW it is common bug in all lance drivers! --ANK
+	 */
+	ib->mode = 0;
+	ib->filter [0] = 0;
+	ib->filter [2] = 0;
+	ib->filter [4] = 0;
+	ib->filter [6] = 0;
+
+	lance_init_ring(dev);
+	load_csrs(lp);
+
+	netif_start_queue(dev);
+
+	/* Associate IRQ with lance_interrupt */
+	if (request_irq(dev->irq, &lance_interrupt, 0, "lance", dev)) {
+		printk("%s: Can't get IRQ %d\n", dev->name, dev->irq);
+		return -EAGAIN;
+	}
+	if (lp->dma_irq >= 0) {
+		unsigned long flags;
+
+		if (request_irq(lp->dma_irq, &lance_dma_merr_int, 0,
+				"lance error", dev)) {
+			free_irq(dev->irq, dev);
+			printk("%s: Can't get DMA IRQ %d\n", dev->name,
+				lp->dma_irq);
+			return -EAGAIN;
+		}
+
+		spin_lock_irqsave(&ioasic_ssr_lock, flags);
+
+		fast_mb();
+		/* Enable I/O ASIC LANCE DMA.  */
+		ioasic_write(IO_REG_SSR,
+			     ioasic_read(IO_REG_SSR) | IO_SSR_LANCE_DMA_EN);
+
+		fast_mb();
+		spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
+	}
+
+	status = init_restart_lance(lp);
+	return status;
+}
+
+static int lance_close(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_regs *ll = lp->ll;
+
+	netif_stop_queue(dev);
+	del_timer_sync(&lp->multicast_timer);
+
+	/* Stop the card */
+	writereg(&ll->rap, LE_CSR0);
+	writereg(&ll->rdp, LE_C0_STOP);
+
+	if (lp->dma_irq >= 0) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&ioasic_ssr_lock, flags);
+
+		fast_mb();
+		/* Disable I/O ASIC LANCE DMA.  */
+		ioasic_write(IO_REG_SSR,
+			     ioasic_read(IO_REG_SSR) & ~IO_SSR_LANCE_DMA_EN);
+
+		fast_iob();
+		spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
+
+		free_irq(lp->dma_irq, dev);
+	}
+	free_irq(dev->irq, dev);
+	return 0;
+}
+
+static inline int lance_reset(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_regs *ll = lp->ll;
+	int status;
+
+	/* Stop the lance */
+	writereg(&ll->rap, LE_CSR0);
+	writereg(&ll->rdp, LE_C0_STOP);
+
+	lance_init_ring(dev);
+	load_csrs(lp);
+	dev->trans_start = jiffies;
+	status = init_restart_lance(lp);
+	return status;
+}
+
+static void lance_tx_timeout(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_regs *ll = lp->ll;
+
+	printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
+		dev->name, ll->rdp);
+	lance_reset(dev);
+	netif_wake_queue(dev);
+}
+
+static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_regs *ll = lp->ll;
+	volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
+	int entry, skblen, len;
+
+	skblen = skb->len;
+
+	len = skblen;
+	
+	if (len < ETH_ZLEN) {
+		skb = skb_padto(skb, ETH_ZLEN);
+		if (skb == NULL)
+			return 0;
+		len = ETH_ZLEN;
+	}
+
+	lp->stats.tx_bytes += len;
+
+	entry = lp->tx_new & TX_RING_MOD_MASK;
+	ib->btx_ring[entry].length = (-len);
+	ib->btx_ring[entry].misc = 0;
+
+	cp_to_buf(lp->type, (char *)lp->tx_buf_ptr_cpu[entry], skb->data,
+		  skblen);
+
+	/* Clear the slack of the packet, do I need this? */
+	/* For a firewall it's a good idea - AC */
+/*
+   if (len != skblen)
+   memset ((char *) &ib->tx_buf [entry][skblen], 0, (len - skblen) << 1);
+ */
+
+	/* Now, give the packet to the lance */
+	ib->btx_ring[entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
+	lp->tx_new = (lp->tx_new + 1) & TX_RING_MOD_MASK;
+
+	if (TX_BUFFS_AVAIL <= 0)
+		netif_stop_queue(dev);
+
+	/* Kick the lance: transmit now */
+	writereg(&ll->rdp, LE_C0_INEA | LE_C0_TDMD);
+
+	spin_unlock_irq(&lp->lock);
+
+	dev->trans_start = jiffies;
+	dev_kfree_skb(skb);
+
+ 	return 0;
+}
+
+static struct net_device_stats *lance_get_stats(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+
+	return &lp->stats;
+}
+
+static void lance_load_multicast(struct net_device *dev)
+{
+	volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
+	volatile u16 *mcast_table = (u16 *) & ib->filter;
+	struct dev_mc_list *dmi = dev->mc_list;
+	char *addrs;
+	int i;
+	u32 crc;
+
+	/* set all multicast bits */
+	if (dev->flags & IFF_ALLMULTI) {
+		ib->filter[0] = 0xffff;
+		ib->filter[2] = 0xffff;
+		ib->filter[4] = 0xffff;
+		ib->filter[6] = 0xffff;
+		return;
+	}
+	/* clear the multicast filter */
+	ib->filter[0] = 0;
+	ib->filter[2] = 0;
+	ib->filter[4] = 0;
+	ib->filter[6] = 0;
+
+	/* Add addresses */
+	for (i = 0; i < dev->mc_count; i++) {
+		addrs = dmi->dmi_addr;
+		dmi = dmi->next;
+
+		/* multicast address? */
+		if (!(*addrs & 1))
+			continue;
+
+		crc = ether_crc_le(ETH_ALEN, addrs);
+		crc = crc >> 26;
+		mcast_table[2 * (crc >> 4)] |= 1 << (crc & 0xf);
+	}
+	return;
+}
+
+static void lance_set_multicast(struct net_device *dev)
+{
+	struct lance_private *lp = netdev_priv(dev);
+	volatile struct lance_init_block *ib;
+	volatile struct lance_regs *ll = lp->ll;
+
+	ib = (struct lance_init_block *) (dev->mem_start);
+
+	if (!netif_running(dev))
+		return;
+
+	if (lp->tx_old != lp->tx_new) {
+		mod_timer(&lp->multicast_timer, jiffies + 4 * HZ/100);
+		netif_wake_queue(dev);
+		return;
+	}
+
+	netif_stop_queue(dev);
+
+	writereg(&ll->rap, LE_CSR0);
+	writereg(&ll->rdp, LE_C0_STOP);
+
+	lance_init_ring(dev);
+
+	if (dev->flags & IFF_PROMISC) {
+		ib->mode |= LE_MO_PROM;
+	} else {
+		ib->mode &= ~LE_MO_PROM;
+		lance_load_multicast(dev);
+	}
+	load_csrs(lp);
+	init_restart_lance(lp);
+	netif_wake_queue(dev);
+}
+
+static void lance_set_multicast_retry(unsigned long _opaque)
+{
+	struct net_device *dev = (struct net_device *) _opaque;
+
+	lance_set_multicast(dev);
+}
+
+static int __init dec_lance_init(const int type, const int slot)
+{
+	static unsigned version_printed;
+	static const char fmt[] = "declance%d";
+	char name[10];
+	struct net_device *dev;
+	struct lance_private *lp;
+	volatile struct lance_regs *ll;
+	int i, ret;
+	unsigned long esar_base;
+	unsigned char *esar;
+
+#ifndef CONFIG_TC
+	system_base = KN01_LANCE_BASE;
+#endif
+
+	if (dec_lance_debug && version_printed++ == 0)
+		printk(version);
+
+	i = 0;
+	dev = root_lance_dev;
+	while (dev) {
+		i++;
+		lp = (struct lance_private *)dev->priv;
+		dev = lp->next;
+	}
+	snprintf(name, sizeof(name), fmt, i);
+
+	dev = alloc_etherdev(sizeof(struct lance_private));
+	if (!dev) {
+		printk(KERN_ERR "%s: Unable to allocate etherdev, aborting.\n",
+			name);
+		ret = -ENOMEM;
+		goto err_out;
+	}
+
+	/*
+	 * alloc_etherdev ensures the data structures used by the LANCE
+	 * are aligned.
+	 */
+	lp = netdev_priv(dev);
+	spin_lock_init(&lp->lock);
+
+	lp->type = type;
+	lp->slot = slot;
+	switch (type) {
+#ifdef CONFIG_TC
+	case ASIC_LANCE:
+		dev->base_addr = system_base + IOASIC_LANCE;
+
+		/* buffer space for the on-board LANCE shared memory */
+		/*
+		 * FIXME: ugly hack!
+		 */
+		dev->mem_start = KSEG1ADDR(0x00020000);
+		dev->mem_end = dev->mem_start + 0x00020000;
+		dev->irq = dec_interrupt[DEC_IRQ_LANCE];
+		esar_base = system_base + IOASIC_ESAR;
+
+		/* Workaround crash with booting KN04 2.1k from Disk */
+		memset((void *)dev->mem_start, 0,
+		       dev->mem_end - dev->mem_start);
+
+		/*
+		 * setup the pointer arrays, this sucks [tm] :-(
+		 */
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			lp->rx_buf_ptr_cpu[i] =
+				(char *)(dev->mem_start + BUF_OFFSET_CPU +
+					 2 * i * RX_BUFF_SIZE);
+			lp->rx_buf_ptr_lnc[i] =
+				(char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
+		}
+		for (i = 0; i < TX_RING_SIZE; i++) {
+			lp->tx_buf_ptr_cpu[i] =
+				(char *)(dev->mem_start + BUF_OFFSET_CPU +
+					 2 * RX_RING_SIZE * RX_BUFF_SIZE +
+					 2 * i * TX_BUFF_SIZE);
+			lp->tx_buf_ptr_lnc[i] =
+				(char *)(BUF_OFFSET_LNC +
+					 RX_RING_SIZE * RX_BUFF_SIZE +
+					 i * TX_BUFF_SIZE);
+		}
+
+		/* Setup I/O ASIC LANCE DMA.  */
+		lp->dma_irq = dec_interrupt[DEC_IRQ_LANCE_MERR];
+		ioasic_write(IO_REG_LANCE_DMA_P,
+			     PHYSADDR(dev->mem_start) << 3);
+
+		break;
+
+	case PMAD_LANCE:
+		claim_tc_card(slot);
+
+		dev->mem_start = get_tc_base_addr(slot);
+		dev->base_addr = dev->mem_start + 0x100000;
+		dev->irq = get_tc_irq_nr(slot);
+		esar_base = dev->mem_start + 0x1c0002;
+		lp->dma_irq = -1;
+
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			lp->rx_buf_ptr_cpu[i] =
+				(char *)(dev->mem_start + BUF_OFFSET_CPU +
+					 i * RX_BUFF_SIZE);
+			lp->rx_buf_ptr_lnc[i] =
+				(char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
+		}
+		for (i = 0; i < TX_RING_SIZE; i++) {
+			lp->tx_buf_ptr_cpu[i] =
+				(char *)(dev->mem_start + BUF_OFFSET_CPU +
+					 RX_RING_SIZE * RX_BUFF_SIZE +
+					 i * TX_BUFF_SIZE);
+			lp->tx_buf_ptr_lnc[i] =
+				(char *)(BUF_OFFSET_LNC +
+					 RX_RING_SIZE * RX_BUFF_SIZE +
+					 i * TX_BUFF_SIZE);
+		}
+
+		break;
+#endif
+
+	case PMAX_LANCE:
+		dev->irq = dec_interrupt[DEC_IRQ_LANCE];
+		dev->base_addr = KN01_LANCE_BASE;
+		dev->mem_start = KN01_LANCE_BASE + 0x01000000;
+		esar_base = KN01_RTC_BASE + 1;
+		lp->dma_irq = -1;
+
+		/*
+		 * setup the pointer arrays, this sucks [tm] :-(
+		 */
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			lp->rx_buf_ptr_cpu[i] =
+				(char *)(dev->mem_start + BUF_OFFSET_CPU +
+					 2 * i * RX_BUFF_SIZE);
+			lp->rx_buf_ptr_lnc[i] =
+				(char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
+		}
+		for (i = 0; i < TX_RING_SIZE; i++) {
+			lp->tx_buf_ptr_cpu[i] =
+				(char *)(dev->mem_start + BUF_OFFSET_CPU +
+					 2 * RX_RING_SIZE * RX_BUFF_SIZE +
+					 2 * i * TX_BUFF_SIZE);
+			lp->tx_buf_ptr_lnc[i] =
+				(char *)(BUF_OFFSET_LNC +
+					 RX_RING_SIZE * RX_BUFF_SIZE +
+					 i * TX_BUFF_SIZE);
+		}
+
+		break;
+
+	default:
+		printk(KERN_ERR "%s: declance_init called with unknown type\n",
+			name);
+		ret = -ENODEV;
+		goto err_out_free_dev;
+	}
+
+	ll = (struct lance_regs *) dev->base_addr;
+	esar = (unsigned char *) esar_base;
+
+	/* prom checks */
+	/* First, check for test pattern */
+	if (esar[0x60] != 0xff && esar[0x64] != 0x00 &&
+	    esar[0x68] != 0x55 && esar[0x6c] != 0xaa) {
+		printk(KERN_ERR
+			"%s: Ethernet station address prom not found!\n",
+			name);
+		ret = -ENODEV;
+		goto err_out_free_dev;
+	}
+	/* Check the prom contents */
+	for (i = 0; i < 8; i++) {
+		if (esar[i * 4] != esar[0x3c - i * 4] &&
+		    esar[i * 4] != esar[0x40 + i * 4] &&
+		    esar[0x3c - i * 4] != esar[0x40 + i * 4]) {
+			printk(KERN_ERR "%s: Something is wrong with the "
+				"ethernet station address prom!\n", name);
+			ret = -ENODEV;
+			goto err_out_free_dev;
+		}
+	}
+
+	/* Copy the ethernet address to the device structure, later to the
+	 * lance initialization block so the lance gets it every time it's
+	 * (re)initialized.
+	 */
+	switch (type) {
+	case ASIC_LANCE:
+		printk("%s: IOASIC onboard LANCE, addr = ", name);
+		break;
+	case PMAD_LANCE:
+		printk("%s: PMAD-AA, addr = ", name);
+		break;
+	case PMAX_LANCE:
+		printk("%s: PMAX onboard LANCE, addr = ", name);
+		break;
+	}
+	for (i = 0; i < 6; i++) {
+		dev->dev_addr[i] = esar[i * 4];
+		printk("%2.2x%c", dev->dev_addr[i], i == 5 ? ',' : ':');
+	}
+
+	printk(" irq = %d\n", dev->irq);
+
+	dev->open = &lance_open;
+	dev->stop = &lance_close;
+	dev->hard_start_xmit = &lance_start_xmit;
+	dev->tx_timeout = &lance_tx_timeout;
+	dev->watchdog_timeo = 5*HZ;
+	dev->get_stats = &lance_get_stats;
+	dev->set_multicast_list = &lance_set_multicast;
+
+	/* lp->ll is the location of the registers for lance card */
+	lp->ll = ll;
+
+	/* busmaster_regval (CSR3) should be zero according to the PMAD-AA
+	 * specification.
+	 */
+	lp->busmaster_regval = 0;
+
+	dev->dma = 0;
+
+	/* We cannot sleep if the chip is busy during a
+	 * multicast list update event, because such events
+	 * can occur from interrupts (ex. IPv6).  So we
+	 * use a timer to try again later when necessary. -DaveM
+	 */
+	init_timer(&lp->multicast_timer);
+	lp->multicast_timer.data = (unsigned long) dev;
+	lp->multicast_timer.function = &lance_set_multicast_retry;
+
+	ret = register_netdev(dev);
+	if (ret) {
+		printk(KERN_ERR
+			"%s: Unable to register netdev, aborting.\n", name);
+		goto err_out_free_dev;
+	}
+
+	lp->next = root_lance_dev;
+	root_lance_dev = dev;
+
+	printk("%s: registered as %s.\n", name, dev->name);
+	return 0;
+
+err_out_free_dev:
+	kfree(dev);
+
+err_out:
+	return ret;
+}
+
+
+/* Find all the lance cards on the system and initialize them */
+static int __init dec_lance_probe(void)
+{
+	int count = 0;
+
+	/* Scan slots for PMAD-AA cards first. */
+#ifdef CONFIG_TC
+	if (TURBOCHANNEL) {
+		int slot;
+
+		while ((slot = search_tc_card("PMAD-AA")) >= 0) {
+			if (dec_lance_init(PMAD_LANCE, slot) < 0)
+				break;
+			count++;
+		}
+	}
+#endif
+
+	/* Then handle onboard devices. */
+	if (dec_interrupt[DEC_IRQ_LANCE] >= 0) {
+		if (dec_interrupt[DEC_IRQ_LANCE_MERR] >= 0) {
+#ifdef CONFIG_TC
+			if (dec_lance_init(ASIC_LANCE, -1) >= 0)
+				count++;
+#endif
+		} else if (!TURBOCHANNEL) {
+			if (dec_lance_init(PMAX_LANCE, -1) >= 0)
+				count++;
+		}
+	}
+
+	return (count > 0) ? 0 : -ENODEV;
+}
+
+static void __exit dec_lance_cleanup(void)
+{
+	while (root_lance_dev) {
+		struct net_device *dev = root_lance_dev;
+		struct lance_private *lp = netdev_priv(dev);
+		unregister_netdev(dev);
+#ifdef CONFIG_TC
+		if (lp->slot >= 0)
+			release_tc_card(lp->slot);
+#endif
+		root_lance_dev = lp->next;
+		free_netdev(dev);
+	}
+}
+
+module_init(dec_lance_probe);
+module_exit(dec_lance_cleanup);