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some success with the declance DS5000/200

To: linux-mips@fnet.fr
Subject: some success with the declance DS5000/200
From: Dave Airlie <airlied@csn.ul.ie>
Date: Thu, 22 Apr 1999 16:42:58 +0100 (IST)
Hi,
        I've been playing about with the lance code on my DS5000/200, I
have found that I've had to reverse most of the changes, and my code is
very close to the original sunlance.c code !!, 

I now boot up but I get a bus error, from what seems to be the
default_dbe_board_handler I think ...

Attached is my current declance.c (heavily modified from the original),
and my boot-up output so far ... I've turned on some debugging options ...

I also get a packet on the wire, 

tcpdump says as ...

15:34:17.157428 8:0:2b:1c:50:52 Broadcast ip 406: truncated-ip - 7916
bytes miss
ing!0.0.64.0 > 64.17.1.136: (frag 26729:8288@39376+)
                         4500 2074 6869 733a 0d0a 0188 0000 4000
                         4011 0188 0000 4000 4011 3966 0000 0000
                         ffff b0d6 0080 70fe 0000 ffff 0044 0043
                         0174 ffff 0044

this is always the same ...

Dave.

------------ David Airlie, David.Airlie@ul.ie,airlied@skynet --------
Telecommunications Research Centre, ECE Dept, University of Limerick \
http://www.csn.ul.ie/~airlied   -- Telecommunications Researcher      \
--- TEL: +353-61-202695 -----------------------------------------------
/*     
 *      Lance ethernet driver for the MIPS processor based
 *      DECstation family
 *
 *
 *      adopted from sunlance.c by Richard van den Berg
 *
 *      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
 */

#undef DEBUG_DRIVER

static char *version =
"declance.c: v0.008 by Linux Mips DECstation task force\n";

static char *lancestr = "LANCE";

/*
 * card types
 */
#define ASIC_LANCE 1
#define PMAD_LANCE 2
#define PMAX_LANCE 3

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>

#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic_ints.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/machtype.h>
#include <asm/dec/tc.h>
#include <asm/dec/kn01.h>
#include <asm/wbflush.h>
#include <asm/addrspace.h>

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/user.h>
#include <linux/utsname.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <linux/etherdevice.h>

#ifndef CONFIG_TC
unsigned long system_base = 0;
unsigned long dmaptr;
#endif
static int type;

#define CRC_POLYNOMIAL_BE 0x04c11db7UL  /* Ethernet CRC, big endian */
#define CRC_POLYNOMIAL_LE 0xedb88320UL  /* Ethernet CRC, little endian */

#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

#define TEST_HITS
#define DEBUG_DRIVER 1

#define ZERO 1

/* 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 */
        unsigned char  rmd1_hadr;   /* high address of packet */
        unsigned char  rmd1_bits;   /* descriptor bits */
        short    length;            /* This length is 2s complement (negative)!
                                     * Buffer length
                                     */
        unsigned short mblength;    /* This is the actual number of bytes 
received */
};

struct lance_tx_desc {
        unsigned short tmd0;        /* low address of packet */
        unsigned char  tmd1_hadr;   /* high address of packet */
        unsigned char  tmd1_bits;   /* descriptor bits */
        short length;               /* Length is 2s complement (negative)! */
        unsigned short misc;
};
                

/* First part of the LANCE initialization block, described in databook. */
struct lance_init_block {
        unsigned short mode;            /* Pre-set mode (reg. 15) */

        unsigned char phys_addr[6];    /* Physical ethernet address
                                         * only 0, 1, 4, 5, 8, 9 are valid
                                         * 2, 3, 6, 7, 10, 11 are gaps
                                         */
        unsigned short filter[4];       /* 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 */
        unsigned short rx_len;          /* receive len and high addr */
        unsigned short tx_ptr;          /* transmit descriptor addr */
        unsigned short tx_len;          /* transmit len and high addr */
        unsigned short gap0[4];

        /* 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 BUF_OFFSET_LNC (sizeof(struct lance_init_block))


#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))

struct lance_private {
        char *name;
        volatile struct lance_regs *ll;
        volatile struct lance_init_block *init_block;
        volatile unsigned long *dma_ptr_reg;
    
        int rx_new, tx_new;
        int rx_old, tx_old;
    
        struct net_device_stats stats;

        unsigned short busmaster_regval;

        struct device            *dev;            /* Backpointer        */
        struct lance_private     *next_module;

        /* 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
 * dependant.
 * 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;

/*
   #ifdef MODULE
   static struct lance_private *root_lance_dev = NULL;
   #endif
 */

static inline void writereg(volatile unsigned short *regptr, short value)
{
        *regptr = value;
        wbflush();
}

/* 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(void *to, const void *from, __kernel_size_t 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++;
        }
        }

        wbflush();
}

void cp_from_buf(void *to, unsigned char *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 */
/* Sets dev->tbusy */
static void lance_init_ring(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        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 */
        dev->tbusy = 1;
        lp->rx_new = lp->tx_new = 0;
        lp->rx_old = lp->tx_old = 0;

        ib->mode = 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[2] = dev->dev_addr[2];
        ib->phys_addr[3] = dev->dev_addr[3];
        ib->phys_addr[4] = dev->dev_addr[4];
        ib->phys_addr[5] = 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));

        /* Clear the multicast filter */
        ib->filter[0] = 0;
        ib->filter[1] = 0;
        ib->filter[2] = 0;
        ib->filter[3] = 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]);
        }
        wbflush();
}

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 device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        volatile struct lance_init_block *ib;
        volatile struct lance_rx_desc *rd = 0;
        unsigned char bits;
        int len = 0;
#ifdef TEST_HITS
        int i;
#endif
        struct sk_buff *skb = 0;
        ib = (struct lance_init_block *) (dev->mem_start);

#ifdef TEST_HITS

        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(skb->data,
                                 (char *) lp->rx_buf_ptr_cpu[lp->rx_new],
                                         len);
                        skb->protocol = eth_type_trans(skb, dev);
                        netif_rx(skb);
                        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 int lance_tx(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        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;

        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", 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);
                                return 0;
                        }
                        /* 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);
                                return 0;
                        }
                } 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;
        return 0;
}

static void lance_interrupt(const int irq, void *dev_id, struct pt_regs *regs)
{
        struct device *dev = (struct device *) dev_id;
        struct lance_private *lp = (struct lance_private *) dev->priv;
        volatile struct lance_regs *ll = lp->ll;
        int csr0;

        if (dev->interrupt)
                printk("%s: again\n", dev->name);
    
        dev->interrupt = 1;

        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 ((TX_BUFFS_AVAIL >= 0) && dev->tbusy) {
                dev->tbusy = 0;
                mark_bh(NET_BH);
        }
        if (csr0 & LE_C0_BABL)
                lp->stats.tx_errors++;

        if (csr0 & LE_C0_MISS)
                lp->stats.rx_errors++;

        if (csr0 & LE_C0_MERR) {
                volatile unsigned long int_stat = *(unsigned long *) 
(system_base + IOCTL + SIR);

                printk("%s: Memory error, status %04x", dev->name, csr0);

                if (int_stat & LANCE_DMA_MEMRDERR) {
                        printk("%s: DMA error\n", dev->name);
                        int_stat |= LANCE_DMA_MEMRDERR; 
                        /*
                         * re-enable LANCE DMA
                         */
                        *(unsigned long *) (system_base + IOCTL + SSR) |= (1 << 
16);
                        wbflush();
                }
                writereg(&ll->rdp, LE_C0_STOP);

                lance_init_ring(dev);
                load_csrs(lp);
                init_restart_lance(lp);
                dev->tbusy = 0;
        }
        writereg(&ll->rdp, LE_C0_INEA);
        writereg(&ll->rdp, LE_C0_INEA);
        dev->interrupt = 0;
}

struct device *last_dev = 0;

static int lance_open(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        volatile struct lance_regs *ll = lp->ll;
        int status = 0;

        last_dev = dev;

        /* Associate IRQ with lance_interrupt */
        if (request_irq(dev->irq, &lance_interrupt, 0, lp->name, dev)) {
                printk("Lance: Can't get irq %d\n", dev->irq);
                return -EAGAIN;
        }
        /* Stop the Lance */
        writereg(&ll->rap, LE_CSR0);
        writereg(&ll->rdp, LE_C0_STOP);

        lance_init_ring(dev);
        load_csrs(lp);

        dev->tbusy = 0;
        dev->interrupt = 0;
        dev->start = 1;

        status = init_restart_lance(lp);

        /*
         * if (!status)
         *      MOD_INC_USE_COUNT;
         */

        return status;
}

static int lance_close(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        volatile struct lance_regs *ll = lp->ll;

        dev->start = 0;
        dev->tbusy = 1;

        /* Stop the card */
        writereg(&ll->rap, LE_CSR0);
        writereg(&ll->rdp, LE_C0_STOP);

        free_irq(dev->irq, (void *) dev);
        /*
        MOD_DEC_USE_COUNT;
        */
        return 0;
}

static inline int lance_reset(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        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;
        dev->interrupt = 0;
        dev->start = 1;
        dev->tbusy = 0;
        status = init_restart_lance(lp);
#ifdef DEBUG_DRIVER
        printk("Lance restart=%d\n", status);
#endif
        return status;
}

static int lance_start_xmit(struct sk_buff *skb, struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        volatile struct lance_regs *ll = lp->ll;
        volatile struct lance_init_block *ib;
        unsigned long flags;
        int entry, skblen, len;
        int status = 0;
        static int outs;
        ib = (struct lance_init_block *) (dev->mem_start);

        /* Transmitter timeout, serious problems */
        if (dev->tbusy) {
                int tickssofar = jiffies - dev->trans_start;
            
                if (tickssofar < 100) {
                        status = -1;
                } else {
                        printk("%s: transmit timed out, status %04x, reset\n",
                                dev->name, ll->rdp);
                        lance_reset(dev);
                }
                return status;
        }
        /* Block a timer-based transmit from overlapping. */
        if (test_and_set_bit(0, (void *) &dev->tbusy) != 0) {
                printk("Transmitter access conflict.\n");
                return -1;
        }
        skblen = skb->len;
        save_and_cli(flags);
        if (!TX_BUFFS_AVAIL) {
                restore_flags(flags);
                return -1;
        }
        len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;

        lp->stats.tx_bytes += len;
        
        entry = lp->tx_new & TX_RING_MOD_MASK;
        ib->btx_ring[entry].length = (-len) | 0xf000;
        ib->btx_ring[entry].misc = 0;
    
        cp_to_buf((char *) lp->tx_buf_ptr_cpu[entry], skb->data, skblen);

        /* Clear the slack of the packet, do I need this? */
        /* For a firewall its 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;

        outs++;
        /* Kick the lance: transmit now */
        writereg(&ll->rdp, LE_C0_INEA | LE_C0_TDMD);
        dev->trans_start = jiffies;
        dev_kfree_skb(skb);
    
        if (TX_BUFFS_AVAIL)
                dev->tbusy = 0;

        restore_flags(flags);
        return status;
}

static struct net_device_stats *lance_get_stats(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;

        return &lp->stats;
}

static void lance_load_multicast(struct 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, j, bit, byte;
        u32 crc, poly = CRC_POLYNOMIAL_BE;

        /* set all multicast bits */
        if (dev->flags & IFF_ALLMULTI) {
                ib->filter[0] = 0xffff;
                ib->filter[1] = 0xffff;
                ib->filter[2] = 0xffff;
                ib->filter[3] = 0xffff;
                return;
        }
        /* clear the multicast filter */
        ib->filter[0] = 0;
        ib->filter[1] = 0;
        ib->filter[2] = 0;
        ib->filter[3] = 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 = 0xffffffff;
                for (byte = 0; byte < 6; byte++)
                        for (bit = *addrs++, j = 0; j < 8; j++, bit >>= 1) {
                                int test;

                                test = ((bit ^ crc) & 0x01);
                                crc >>= 1;

                                if (test) {
                                        crc = crc ^ poly;
                                }
                        }
                
                crc = crc >> 26;
                mcast_table[crc >> 4] |= 1 << (crc & 0xf);
        }
        return;
}

static void lance_set_multicast(struct device *dev)
{
        struct lance_private *lp = (struct lance_private *) dev->priv;
        volatile struct lance_init_block *ib;
        volatile struct lance_regs *ll = lp->ll;

        ib = (struct lance_init_block *) (dev->mem_start);

        while (dev->tbusy)
          schedule();
        set_bit(0, (void *) &dev->tbusy);
        while (lp->tx_old != lp->tx_new)
                schedule();

        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);
        dev->tbusy = 0;
}

__initfunc(static int dec_lance_init(struct device *dev, const int type))
{
        static unsigned version_printed = 0;
        struct lance_private *lp;
        volatile struct lance_regs *ll;
        int i;
        unsigned long esar_base;
        unsigned char *esar;

#ifndef CONFIG_TC
        system_base = KN01_LANCE_BASE;
#else
        int slot;
#endif

        if (dec_lance_debug && version_printed++ == 0)
                printk(version);

        if (dev == NULL) {
                dev = init_etherdev(0, sizeof(struct lance_private) + 8);
        } else {
                dev->priv = kmalloc(sizeof(struct lance_private) + 8,
                                     GFP_KERNEL);
                if (dev->priv == NULL)
                        return -ENOMEM;
                memset(dev->priv, 0, sizeof(struct lance_private) + 8);

        }

        /* Make certain the data structures used by the LANCE are aligned. */
        dev->priv = (void *) (((unsigned long) dev->priv + 7) & ~7);
        lp = (struct lance_private *) dev->priv;

        switch (type) {
#ifdef CONFIG_TC
        case ASIC_LANCE:
                dev->base_addr = system_base + LANCE;

                /* buffer space for the on-board LANCE shared memory */
                /*
                 * FIXME: ugly hack!
                 */
                dev->mem_start = KSEG1ADDR(0x0020000);
                dev->mem_end = dev->mem_start + 0x00020000;
                dev->irq = ETHER;
                esar_base = system_base + ESAR;

                /*
                 * 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 and enable IOASIC LANCE DMA
                 */
                lp->dma_ptr_reg = (unsigned long *) (system_base + IOCTL + 
LANCE_DMA_P);
                *(lp->dma_ptr_reg) = PHYSADDR(dev->mem_start) << 3;
                *(unsigned long *) (system_base + IOCTL + SSR) |= (1 << 16);
                wbflush();

                break;
        case PMAD_LANCE:
                slot = search_tc_card("PMAD-AA");
                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;
               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 = ETHER;
                dev->base_addr = KN01_LANCE_BASE;
                dev->mem_start = KN01_LANCE_BASE + 0x01000000;
                esar_base = KN01_RTC_BASE + 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("declance_init called with unknown type\n");
                return -ENODEV;
                break;
        }

        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("Ethernet station address prom not found!\n");
                return -ENODEV;
        }
        /* 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("Something is wrong with the ethernet "
                                "station address prom!\n");
                        return -ENODEV;
                }
        }

        /* 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 = ", dev->name);
                break;
        case PMAD_LANCE:
                printk("%s: PMAD-AA, addr = ", dev->name);
                break;
        case PMAX_LANCE:
                printk("%s: PMAX onboard LANCE, addr = ", dev->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);

        /* Fill the dev fields */

        dev->open = lance_open;
        dev->stop = lance_close;
        dev->hard_start_xmit = lance_start_xmit;
        dev->get_stats = lance_get_stats;
        dev->set_multicast_list = lance_set_multicast;
        dev->dma = 0;

        /* lp->ll is the location of the registers for lance card */
        lp->ll = ll;

        lp->name = lancestr;

        /* busmaster_regval (CSR3) should be zero according to the PMAD-AA
         * specification.
         */
        lp->busmaster_regval = 0;
        lp->dev = dev;

        ether_setup(dev);
/*
   #ifdef MODULE
        dev->ifindex = dev_new_index();
        lp->next_module = root_lance_dev;
        root_lance_dev = lp;
   #endif
 */
        return 0;
}


/* Find all the lance cards on the system and initialize them */
__initfunc(int dec_lance_probe(struct device *dev))
{
        static int called = 0;

#ifdef CONFIG_TC
        int slot = -1;

        if (TURBOCHANNEL) {
                if (IOASIC && !called) {
                        called = 1;
                        type = ASIC_LANCE;
                } else {
                        if ((slot = search_tc_card("PMAD-AA")) >= 0) {
                                type = PMAD_LANCE;
                        } else {
                                return -ENODEV;
                        }
                }
        } else { 
                if (!called) {
                        called = 1;
                        type = PMAX_LANCE;
                } else {
                        return -ENODEV;
                }
        }
#else
        if (!called && !TURBOCHANNEL) {
                called = 1;
                type = PMAX_LANCE;
        } else {
                return -ENODEV;
        }
#endif

        return dec_lance_init(dev, type);
}

/*
   #ifdef MODULE

   int
   init_module(void)
   {
        root_lance_dev = NULL;
        return dec_lance_probe(NULL);
   }

   void
   cleanup_module(void)
   {
        struct lance_private *lp;

        while (root_lance_dev) {
                lp = root_lance_dev->next_module;

                unregister_netdev(root_lance_dev->dev);
                kfree(root_lance_dev->dev);
                root_lance_dev = lp;
        }
   }

   #endif -* MODULE */
KN02-AA V5.3c    (PC: 0x8004eff8, SP: 0x8032e380)
>>
>>boot 6/tftp
1270688+114800+105856
Launching kernel...
MAGIC using REX!!This DECstation is a DS5000/200
Loading R[23]00 MMU routines.
CPU revision is: 00000220
Instruction cache 64kb
Data cache 64kb
Linux version 2.2.1 (airlied@intel11.ece.ul.ie) (gcc version egcs-2.90.27 
980315 (egcs-1.0.2 release)) #41 Wed Apr 21 17:43:12 IST 1999
Calibrating delay loop... 24.84 BogoMIPS
Memory: 14500k/16380k available (1116k kernel code, 392k data)
Checking for 'wait' instruction...  unavailable.
POSIX conformance testing by UNIFIX
slot0addr at 3187671040l
TURBOchannel rev. 1 at 25.0 MHz (no parity)
    slot 5: DEC      PMAZ-AA  V5.3b   
    slot 6: DEC      PMAD-AA  V5.3a   
Linux NET4.0 for Linux 2.2
Based upon Swansea University Computer Society NET3.039
NET4: Unix domain sockets 1.0 for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
Starting kswapd v 1.5 
DECstation DZ serial driver version 1.02
ttyS00 at 0xbfe00000 (irq = 4)
ttyS01 at 0xbfe00000 (irq = 4)
ttyS02 at 0xbfe00000 (irq = 4)
ttyS03 at 0xbfe00000 (irq = 4)
RAM disk driver initialized:  16 RAM disks of 4096K size
scsi : 0 hosts.
scsi : detected total.
declance.c: v0.008 by Linux Mips DECstation task force
eth0: PMAD-AA, addr = 08:00:2b:1c:50:52, irq = 3
RX ptr: 00000020(00000020)
TX ptr: 000000a0(000000a0)
TX rings:
0: 0x00006120(0xbf806120)
1: 0x00006720(0xbf806720)
2: 0x00006d20(0xbf806d20)
RX rings:
0: 0x00000120(0xbf800120)
1: 0x00000720(0xbf800720)
2: 0x00000d20(0xbf800d20)
RX ptr: 00000020(00000020)
TX ptr: 000000a0(000000a0)
TX rings:
0: 0x00006120(0xbf806120)
1: 0x00006720(0xbf806720)
2: 0x00006d20(0xbf806d20)
RX rings:
0: 0x00000120(0xbf800120)
1: 0x00000720(0xbf800720)
2: 0x00000d20(0xbf800d20)
RX ptr: 00000020(00000020)
TX ptr: 000000a0(000000a0)
TX rings:
0: 0x00006120(0xbf806120)
1: 0x00006720(0xbf806720)
2: 0x00006d20(0xbf806d20)
RX rings:
0: 0x00000120(0xbf800120)
1: 0x00000720(0xbf800720)
2: 0x00000d20(0xbf800d20)
Sending BOOTP requests....ôP??J?Got Bus Error at 8005a814
$0 : 00000000 10000c00 00000144 00000009 6d696f99 00000001 8032e000 80170000
$8 : 10000c00 1000001e 10000c00 0000000a 00000ff6 8017b358 00000001 80ff7c02
$16: 8005a810 8032e4b0 00ffffff 80330088 00000000 80176733 80176734 80170000
$24: 00000001 10000c01                   8032e000 8032e460 80170000 8005abe4
epc  : 8005a814
Status: 10000c00
Cause : 30002410
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