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/* lance.c: Linux/Sparc/Lance driver */

/*

        Written 1995, 1996 by Miguel de Icaza

  Sources:

        The Linux  depca driver

        The Linux  lance driver.

        The Linux  skeleton driver.

        The NetBSD Sparc/Lance driver.

        Theo de Raadt (deraadt@openbsd.org)

        NCR92C990 Lan Controller manual

1.4:

        Added support to run with a ledma on the Sun4m

1.5:

        Added multiple card detection.

        4/17/97: Burst sizes and tpe selection on sun4m by Christian Dost

                 (ecd@pool.informatik.rwth-aachen.de)

*/

#undef DEBUG_DRIVER

static char *version =

        "sunlance.c:v1.6 19/Apr/96 Miguel de Icaza (miguel@nuclecu.unam.mx)\n";

static char *lancestr = "LANCE";

static char *lancedma = "LANCE DMA";

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/types.h>

#include <linux/fcntl.h>

#include <linux/interrupt.h>

#include <linux/ptrace.h>

#include <linux/ioport.h>

#include <linux/in.h>

#include <linux/malloc.h>

#include <linux/string.h>

#include <asm/system.h>

#include <asm/bitops.h>

#include <asm/io.h>

#include <asm/dma.h>

#include <linux/errno.h>

#include <asm/byteorder.h>      /* Used by the checksum routines */

/* Used for the temporal inet entries and routing */

#include <linux/socket.h>

#include <linux/route.h>

#include <asm/idprom.h>

#include <asm/sbus.h>

#include <asm/openprom.h>

#include <asm/oplib.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

/* 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 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 TX_RING_SIZE                    (1 << (LANCE_LOG_TX_BUFFERS))

#define TX_RING_MOD_MASK                (TX_RING_SIZE - 1)

#define TX_RING_LEN_BITS                ((LANCE_LOG_TX_BUFFERS) << 29)

#define RX_RING_SIZE                    (1 << (LANCE_LOG_RX_BUFFERS))

#define RX_RING_MOD_MASK                (RX_RING_SIZE - 1)

#define RX_RING_LEN_BITS                ((LANCE_LOG_RX_BUFFERS) << 29)

#define PKT_BUF_SZ              1544

#define RX_BUFF_SIZE            PKT_BUF_SZ

#define TX_BUFF_SIZE            PKT_BUF_SZ

struct lance_rx_desc {

        unsigned short rmd0;        /* low address of packet */

        unsigned char  rmd1_bits;   /* descriptor bits */

        unsigned char  rmd1_hadr;   /* high address of packet */

        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_bits;   /* descriptor bits */

        unsigned char  tmd1_hadr;   /* high address of packet */

        short length;               /* Length is 2s complement (negative)! */

        unsigned short misc;

};

/* The LANCE initialization block, described in databook. */

/* On the Sparc, this block should be on a DMA region     */

struct lance_init_block {

        unsigned short mode;            /* Pre-set mode (reg. 15) */

        unsigned char phys_addr[6];     /* Physical ethernet address */

        unsigned filter[2];             /* Multicast filter. */

        /* 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 */

        /* The Tx and Rx ring entries must aligned on 8-byte boundaries. */

        struct lance_rx_desc brx_ring[RX_RING_SIZE];

        struct lance_tx_desc btx_ring[TX_RING_SIZE];

        char   rx_buf [RX_RING_SIZE][RX_BUFF_SIZE];

        char   tx_buf [TX_RING_SIZE][TX_BUFF_SIZE];

};

struct lance_private {

        char *name;

        volatile struct lance_regs *ll;

        volatile struct lance_init_block *init_block;

        int rx_new, tx_new;

        int rx_old, tx_old;

        struct enet_statistics stats;

        struct Linux_SBus_DMA *ledma; /* if set this points to ledma and arch=4m */

        int tpe;                      /* cable-selection is TPE */

        int burst_sizes;              /* ledma SBus burst sizes */

};

#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)

/* On the sparc, the lance control ports are memory mapped */

struct lance_regs {

        unsigned short rdp;                     /* register data port */

        unsigned short rap;                     /* register address port */

};

int sparc_lance_debug = 2;

/* The Lance uses 24 bit addresses */

/* On the Sun4c the DVMA will provide the remaining bytes for us */

/* On the Sun4m we have to instruct the ledma to provide them    */

#define LANCE_ADDR(x) ((int)(x) & ~0xff000000)

/* Load the CSR registers */

static void load_csrs (struct lance_private *lp)

{

        volatile struct lance_regs *ll = lp->ll;

        volatile struct lance_init_block *ib = lp->init_block;

        int leptr;

        leptr = LANCE_ADDR (ib);

        ll->rap = LE_CSR1;

        ll->rdp = (leptr & 0xFFFF);

        ll->rap = LE_CSR2;

        ll->rdp = leptr >> 16;

        ll->rap = LE_CSR3;

        ll->rdp = LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON;

        /* Point back to csr0 */

        ll->rap = LE_CSR0;

}

#define ZERO 0

/* 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 = lp->init_block;

        int leptr;

        int i;

        /* 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

         * Note that on the sparc you need to swap the ethernet address.

         */

        ib->phys_addr [0] = dev->dev_addr [1];

        ib->phys_addr [1] = dev->dev_addr [0];

        ib->phys_addr [2] = dev->dev_addr [3];

        ib->phys_addr [3] = dev->dev_addr [2];

        ib->phys_addr [4] = dev->dev_addr [5];

        ib->phys_addr [5] = dev->dev_addr [4];

        if (ZERO)

                printk ("TX rings:\n");

        /* Setup the Tx ring entries */

        for (i = 0; i <= TX_RING_SIZE; i++) {

                leptr = LANCE_ADDR(&ib->tx_buf[i][0]);

                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)

                        if (ZERO) printk ("%d: 0x%8.8x\n", i, leptr);

        }

        /* Setup the Rx ring entries */

        if (ZERO)

                printk ("RX rings:\n");

        for (i = 0; i < RX_RING_SIZE; i++) {

                leptr = LANCE_ADDR(&ib->rx_buf[i][0]);

                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\n", i, leptr);

        }

        /* Setup the initialization block */

        /* Setup rx descriptor pointer */

        leptr = LANCE_ADDR(&ib->brx_ring);

        ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);

        ib->rx_ptr = leptr;

        if (ZERO)

                printk ("RX ptr: %8.8x\n", leptr);

        /* Setup tx descriptor pointer */

        leptr = LANCE_ADDR(&ib->btx_ring);

        ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);

        ib->tx_ptr = leptr;

        if (ZERO)

                printk ("TX ptr: %8.8x\n", leptr);

        /* Clear the multicast filter */

        ib->filter [0] = 0;

        ib->filter [1] = 0;

}

static int init_restart_lance (struct lance_private *lp)

{

        volatile struct lance_regs *ll = lp->ll;

        int i;

        if (lp->ledma) {

                struct sparc_dma_registers *dregs = lp->ledma->regs;

                unsigned long creg;

                while (dregs->cond_reg & DMA_FIFO_ISDRAIN) /* E-Cache draining */

                        barrier();

                creg = dregs->cond_reg;

                if (lp->burst_sizes & DMA_BURST32)

                        creg |= DMA_E_BURST8;

                else

                        creg &= ~DMA_E_BURST8;

                creg |= (DMA_DSBL_RD_DRN | DMA_DSBL_WR_INV | DMA_FIFO_INV);

                if (lp->tpe)

                        creg |= DMA_EN_ENETAUI;

                else

                        creg &= ~DMA_EN_ENETAUI;

                udelay(20);

                dregs->cond_reg = creg;

                udelay(200);

        }

        ll->rap = LE_CSR0;

        ll->rdp = LE_C0_INIT;

        /* Wait for the lance to complete initialization */

        for (i = 0; (i < 100) && !(ll->rdp & (LE_C0_ERR | LE_C0_IDON)); i++)

                barrier();

        if ((i == 100) || (ll->rdp & LE_C0_ERR)) {

                printk ("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);

                if (lp->ledma)

                        printk ("dcsr=%8.8x\n",

                                (unsigned int) lp->ledma->regs->cond_reg);

                return -1;

        }

        /* Clear IDON by writing a "1", enable interrupts and start lance */

        ll->rdp = LE_C0_IDON;

        ll->rdp = LE_C0_INEA | LE_C0_STRT;

        if (lp->ledma)

                lp->ledma->regs->cond_reg |= DMA_INT_ENAB;

        return 0;

}

static int lance_rx (struct device *dev)

{

        struct lance_private *lp = (struct lance_private *) dev->priv;

        volatile struct lance_init_block *ib = lp->init_block;

        volatile struct lance_regs *ll = lp->ll;

        volatile struct lance_rx_desc *rd;

        unsigned char bits;

#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

        ll->rdp = LE_C0_RINT|LE_C0_INEA;

        for (rd = &ib->brx_ring [lp->rx_new];

             !((bits = rd->rmd1_bits) & LE_R1_OWN);

             rd = &ib->brx_ring [lp->rx_new]) {

                int pkt_len;

                struct sk_buff *skb;

                /* We got an incomplete frame? */

                if ((bits & LE_R1_POK) != LE_R1_POK) {

                        lp->stats.rx_over_errors++;

                        lp->stats.rx_errors++;

                        continue;

                } else if (bits & LE_R1_ERR) {

                        /* Count only the end frame as a tx 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 {

                        pkt_len = rd->mblength;

                        skb = dev_alloc_skb (pkt_len+2);

                        if (skb == NULL) {

                                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;

                        }

                        skb->dev = dev;

                        skb_reserve (skb, 2);               /* 16 byte align */

                        skb_put (skb, pkt_len);             /* make room */

                        eth_copy_and_sum(skb,

                                         (unsigned char *)&(ib->rx_buf [lp->rx_new][0]),

                                         pkt_len, 0);

                        skb->protocol = eth_type_trans (skb,dev);

                        netif_rx (skb);

                        lp->stats.rx_packets++;

                }

                /* Return the packet to the pool */

                rd->mblength = 0;

                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 = lp->init_block;

        volatile struct lance_regs *ll = lp->ll;

        volatile struct lance_tx_desc *td;

        int i, j;

        int status;

        /* csr0 is 2f3 */

        ll->rdp = LE_C0_TINT | LE_C0_INEA;

        /* csr0 is 73 */

        j = lp->tx_old;

        for (i = 0; i < TX_RING_SIZE; i++) {

                td = &ib->btx_ring [j];

                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_CLOS) lp->stats.tx_carrier_errors++;

                        if (status & LE_T3_LCOL) lp->stats.tx_window_errors++;

                        /* 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 */

                                ll->rap = LE_CSR0;

                                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;

                        /* What to set here? */

                        if (td->tmd1_bits & LE_T1_EDEF)

                                /* EMPTY */ ;

                        lp->stats.tx_packets++;

                }

                j = (j + 1) & TX_RING_MOD_MASK;

        }

        lp->tx_old = (lp->tx_old+1) & TX_RING_MOD_MASK;

        ll->rdp = LE_C0_TINT | LE_C0_INEA;

        return 0;

}

static void lance_interrupt (int irq, void *dev_id, struct pt_regs *regs)

{

        struct device *dev;

        struct lance_private *lp;

        volatile struct lance_regs *ll;

        int csr0;

#ifdef OLD_STYLE_IRQ

        dev = (struct device *) (irq2dev_map [irq]);

#else

        dev = (struct device *) dev_id;

#endif

        lp = (struct lance_private *) dev->priv;

        ll = lp->ll;

        if (lp->ledma) {

                if (lp->ledma->regs->cond_reg & DMA_HNDL_ERROR) {

                        printk ("%s: should reset my ledma (dmacsr=%8.8x, csr=%4.4x\n",

                                dev->name, (unsigned int) lp->ledma->regs->cond_reg,

                                ll->rdp);

                        printk ("send mail to miguel@nuclecu.unam.mx\n");

                }

        }

        if (dev->interrupt)

                printk ("%s: again", dev->name);

        dev->interrupt = 1;

        csr0 = ll->rdp;

        /* Acknowledge all the interrupt sources ASAP */

        ll->rdp = csr0 & 0x004f;

        if ((csr0 & LE_C0_ERR)) {

                /* Clear the error condition */

                ll->rdp = LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA;

        }

        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);

        }

        ll->rap = LE_CSR0;

        ll->rdp = 0x7940;

        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;

        if (request_irq (dev->irq, &lance_interrupt, 0, lancestr, (void *) dev)) {

                printk ("Lance: Can't get irq %d\n", dev->irq);

                return -EAGAIN;

        }

        /* Stop the Lance */

        ll->rap = LE_CSR0;

        ll->rdp = LE_C0_STOP;

#ifdef OLD_STYLE_IRQ

        irq2dev_map [dev->irq] = dev;

#endif

        /* On the 4m, setup the ledma to provide the upper bits for buffers */

        if (lp->ledma)

                lp->ledma->regs->dma_test = ((unsigned int) lp->init_block) & 0xff000000;

        lance_init_ring (dev);

        load_csrs (lp);

        dev->tbusy = 0;

        dev->interrupt = 0;

        dev->start = 1;

        status = init_restart_lance (lp);

#if 0

        /* To emulate SunOS, we add a route to the local network */

        rt_add (RTF_UP,

                dev->pa_addr & ip_get_mask (dev->pa_addr),

                ip_get_mask (dev->pa_addr),

                0, dev, dev->mtu, 0, 0);

#endif

        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 */

        ll->rap = LE_CSR0;

        ll->rdp = LE_C0_STOP;

        free_irq (dev->irq, NULL);

#ifdef OLD_STYLE_IRQ

        irq2dev_map [dev->irq] = NULL;

#endif

        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 */

        ll->rap = LE_CSR0;

        ll->rdp = LE_C0_STOP;

        /* On the 4m, reset the dma too */

        if (lp->ledma) {

                printk ("resetting ledma\n");

                lp->ledma->regs->cond_reg |= DMA_RST_ENET;

                udelay (200);

                lp->ledma->regs->cond_reg &= ~DMA_RST_ENET;

                lp->ledma->regs->dma_test = ((unsigned int) lp->init_block) & 0xff000000;

        }

        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 = lp->init_block;

        volatile unsigned long flush;

        int entry, skblen, len;

        int status = 0;

        static int outs;

        /* 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, resetting\n",

                                dev->name, ll->rdp);

                        lance_reset (dev);

                }