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Re: some success with the declance DS5000/200

To: linux-mips@fnet.fr
Subject: Re: some success with the declance DS5000/200
From: Dave Airlie <airlied@csn.ul.ie>
Date: Thu, 22 Apr 1999 22:02:40 +0100 (IST)
In-reply-to: <Pine.LNX.3.95.990422163326.17055C-300000@skynet.csn.ul.ie>
hi again ..

Okay I'm just silly.. I don't know what I was on when I did this !!

I reverted myself a while back to an old declance.c and I forgot to add
back a few lines .. DOH!!:

So now it sends the bootp request to the wire, my PC sees it replies and
whole lot hangs ... well at I call it progress :-)..

I'll give an attempt at getting a consoldiated declance.c together....

Dave.


On Thu, 22 Apr 1999, Dave Airlie wrote:

> 
> 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 -----------------------------------------------
> 

------------ 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 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 */
        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 */
        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 == PMAD_LANCE) {
          memcpy(to, from, len);
        }
        else 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 == PMAD_LANCE) {
          memcpy(to, from, len);
        }
        else 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_LE;

        /* 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 */
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