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/*

 * 7990.c -- LANCE ethernet IC generic routines.

 * This is an attempt to separate out the bits of various ethernet

 * drivers that are common because they all use the AMD 7990 LANCE

 * (Local Area Network Controller for Ethernet) chip.

 *

 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>

 *

 * Most of this stuff was obtained by looking at other LANCE drivers,

 * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.

 * NB: this was made easy by the fact that Jes Sorensen had cleaned up

 * most of a2025 and sunlance with the aim of merging them, so the

 * common code was pretty obvious.

 */

#include <linux/module.h>

#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/slab.h>

#include <linux/string.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/crc32.h>

#include <asm/system.h>

#include <asm/bitops.h>

#include <asm/io.h>

#include <asm/dma.h>

#include <asm/pgtable.h>

#include <linux/errno.h>

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

#include <linux/socket.h>

#include <linux/route.h>

#include <linux/dio.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include "7990.h"

/* Lossage Factor Nine, Mr Sulu. */

#define WRITERAP(x) (lp->writerap(lp,x))

#define WRITERDP(x) (lp->writerdp(lp,x))

#define READRDP() (lp->readrdp(lp))

/* These used to be ll->rap = x, ll->rdp = x, and (ll->rdp). Sigh.

 * If you want to switch them back then

 * #define DECLARE_LL volatile struct lance_regs *ll = lp->ll

 */

#define DECLARE_LL /* nothing to declare */

/* debugging output macros, various flavours */

/* #define TEST_HITS */

#ifdef UNDEF

#define PRINT_RINGS() \

do { \

        int t; \

        for (t=0; t < RX_RING_SIZE; t++) { \

                printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n",\

                       t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,\

                       ib->brx_ring[t].length,\

                       ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);\

        }\

        for (t=0; t < TX_RING_SIZE; t++) { \

                printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n",\

                       t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,\

                       ib->btx_ring[t].length,\

                       ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);\

        }\

} while (0)

#else

#define PRINT_RINGS()

#endif        

/* Load the CSR registers. The LANCE has to be STOPped when we do this! */

static void load_csrs (struct lance_private *lp)

{

        volatile struct lance_init_block *aib = lp->lance_init_block;

        int leptr;

        DECLARE_LL;

        leptr = LANCE_ADDR (aib);

        WRITERAP(LE_CSR1);                        /* load address of init block */

        WRITERDP(leptr & 0xFFFF);

        WRITERAP(LE_CSR2);

        WRITERDP(leptr >> 16);

        WRITERAP(LE_CSR3);

        WRITERDP(lp->busmaster_regval);           /* set byteswap/ALEctrl/byte ctrl */

        /* Point back to csr0 */

        WRITERAP(LE_CSR0);

}

/* #define to 0 or 1 appropriately */

#define DEBUG_IRING 0

/* Set up the Lance Rx and Tx rings and the init block */

static void lance_init_ring (struct net_device *dev)

{

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

        volatile struct lance_init_block *ib = lp->init_block;

        volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */

        int leptr;

        int i;

        aib = lp->lance_init_block;

        lp->rx_new = lp->tx_new = 0;

        lp->rx_old = lp->tx_old = 0;

        ib->mode = LE_MO_PROM;                             /* normal, enable Tx & Rx */

        /* Copy the ethernet address to the lance init block

         * Notice that we do a byteswap if we're big endian.

         * [I think this is the right criterion; at least, sunlance,

         * a2065 and atarilance do the byteswap and lance.c (PC) doesn't.

         * However, the datasheet says that the BSWAP bit doesn't affect

         * the init block, so surely it should be low byte first for

         * everybody? Um.]

         * We could define the ib->physaddr as three 16bit values and

         * use (addr[1] << 8) | addr[0] & co, but this is more efficient.

         */

#ifdef __BIG_ENDIAN

        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];

#else

        for (i=0; i<6; i++)

           ib->phys_addr[i] = dev->dev_addr[i];

#endif        

        if (DEBUG_IRING)

                printk ("TX rings:\n");

        lp->tx_full = 0;

        /* Setup the Tx ring entries */

        for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {

                leptr = LANCE_ADDR(&aib->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 (DEBUG_IRING)

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

        }

        /* Setup the Rx ring entries */

        if (DEBUG_IRING)

                printk ("RX rings:\n");

        for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {

                leptr = LANCE_ADDR(&aib->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;

                /* 0xf000 == bits that must be one (reserved, presumably) */

                ib->brx_ring [i].length    = -RX_BUFF_SIZE | 0xf000;

                ib->brx_ring [i].mblength  = 0;

                if (DEBUG_IRING)

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

        }

        /* Setup the initialization block */

        /* Setup rx descriptor pointer */

        leptr = LANCE_ADDR(&aib->brx_ring);

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

        ib->rx_ptr = leptr;

        if (DEBUG_IRING)

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

        /* Setup tx descriptor pointer */

        leptr = LANCE_ADDR(&aib->btx_ring);

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

        ib->tx_ptr = leptr;

        if (DEBUG_IRING)

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

        /* Clear the multicast filter */

        ib->filter [0] = 0;

        ib->filter [1] = 0;

        PRINT_RINGS();

}

/* LANCE must be STOPped before we do this, too... */

static int init_restart_lance (struct lance_private *lp)

{

        int i;

        DECLARE_LL;

        WRITERAP(LE_CSR0);

        WRITERDP(LE_C0_INIT);

        /* Need a hook here for sunlance ledma stuff */

        /* Wait for the lance to complete initialization */

        for (i = 0; (i < 100) && !(READRDP() & (LE_C0_ERR | LE_C0_IDON)); i++)

                barrier();

        if ((i == 100) || (READRDP() & LE_C0_ERR)) {

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

                return -1;

        }

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

        WRITERDP(LE_C0_IDON);

        WRITERDP(LE_C0_INEA | LE_C0_STRT);

        return 0;

}

static int lance_reset (struct net_device *dev)

{

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

        int status;

        DECLARE_LL;

        /* Stop the lance */

        WRITERAP(LE_CSR0);

        WRITERDP(LE_C0_STOP);

        load_csrs (lp);

        lance_init_ring (dev);

        dev->trans_start = jiffies;

        status = init_restart_lance (lp);

#ifdef DEBUG_DRIVER

        printk ("Lance restart=%d\n", status);

#endif

        return status;

}

static int lance_rx (struct net_device *dev)

{

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

        volatile struct lance_init_block *ib = lp->init_block;

        volatile struct lance_rx_desc *rd;

        unsigned char bits;

        int len = 0;                    /* XXX shut up gcc warnings */

        struct sk_buff *skb = 0;        /* XXX shut up gcc warnings */

#ifdef TEST_HITS

        int i;

#endif

        DECLARE_LL;

#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

        WRITERDP(LE_C0_RINT | LE_C0_INEA);     /* ack Rx int, reenable ints */

        for (rd = &ib->brx_ring [lp->rx_new];     /* For each Rx ring we own... */

             !((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++;

                        continue;

                } 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) & lp->rx_ring_mod_mask;

                                return 0;

                        }

                        skb->dev = dev;

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

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

                        eth_copy_and_sum(skb,

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

                                         len, 0);

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

                        netif_rx (skb);

                        dev->last_rx = jiffies;

                        lp->stats.rx_packets++;

                        lp->stats.rx_bytes += len;

                }

                /* Return the packet to the pool */

                rd->mblength = 0;

                rd->rmd1_bits = LE_R1_OWN;

                lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;

        }

        return 0;

}

static int lance_tx (struct net_device *dev)

{

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

        volatile struct lance_init_block *ib = lp->init_block;

        volatile struct lance_tx_desc *td;

        int i, j;

        int status;

        DECLARE_LL;

        /* csr0 is 2f3 */

        WRITERDP(LE_C0_TINT | LE_C0_INEA);

        /* csr0 is 73 */

        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++;

                                if (lp->auto_select) {

                                        lp->tpe = 1 - lp->tpe;

                                        printk("%s: Carrier Lost, trying %s\n",

                                               dev->name, lp->tpe?"TPE":"AUI");

                                        /* Stop the lance */

                                        WRITERAP(LE_CSR0);

                                        WRITERDP(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 */

                                WRITERAP(LE_CSR0);

                                WRITERDP(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) & lp->tx_ring_mod_mask;

        }

        lp->tx_old = j;

        WRITERDP(LE_C0_TINT | LE_C0_INEA);

        return 0;

}

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

{

        struct net_device *dev = (struct net_device *)dev_id;

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

        int csr0;

        DECLARE_LL;

        spin_lock (&lp->devlock);

        WRITERAP(LE_CSR0);              /* LANCE Controller Status */

        csr0 = READRDP();

        PRINT_RINGS();

        if (!(csr0 & LE_C0_INTR)) {     /* Check if any interrupt has */

                spin_lock (&lp->devlock);

                return;                 /* been generated by the Lance. */

        }

        /* Acknowledge all the interrupt sources ASAP */

        WRITERDP(csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));

        if ((csr0 & LE_C0_ERR)) {

                /* Clear the error condition */

                WRITERDP(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);

        /* Log misc errors. */

        if (csr0 & LE_C0_BABL)

                lp->stats.tx_errors++;       /* Tx babble. */

        if (csr0 & LE_C0_MISS)

                lp->stats.rx_errors++;       /* Missed a Rx frame. */

        if (csr0 & LE_C0_MERR) {

                printk("%s: Bus master arbitration failure, status %4.4x.\n",

                       dev->name, csr0);

                /* Restart the chip. */

                WRITERDP(LE_C0_STRT);

        }

        if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {

                lp->tx_full = 0;

                netif_wake_queue (dev);

        }

        WRITERAP(LE_CSR0);

        WRITERDP(LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);

        spin_unlock (&lp->devlock);

}

int lance_open (struct net_device *dev)

{

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

        int res;

        DECLARE_LL;

        /* Install the Interrupt handler. Or we could shunt this out to specific drivers? */

        if (request_irq(lp->irq, lance_interrupt, 0, lp->name, dev))

                return -EAGAIN;

        res = lance_reset(dev);

        lp->devlock = SPIN_LOCK_UNLOCKED;

        netif_start_queue (dev);

        return res;

}

int lance_close (struct net_device *dev)

{

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

        DECLARE_LL;

        netif_stop_queue (dev);

        /* Stop the LANCE */

        WRITERAP(LE_CSR0);

        WRITERDP(LE_C0_STOP);

        free_irq(lp->irq, dev);

        return 0;

}

void lance_tx_timeout(struct net_device *dev)

{

        printk("lance_tx_timeout\n");

        lance_reset(dev);

        dev->trans_start = jiffies;

        netif_wake_queue (dev);

}

int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)

{

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

        volatile struct lance_init_block *ib = lp->init_block;

        int entry, skblen, len;

        static int outs;

        unsigned long flags;

        DECLARE_LL;

        if (!TX_BUFFS_AVAIL)

                return -1;

        netif_stop_queue (dev);

        skblen = skb->len;

#ifdef DEBUG_DRIVER

        /* dump the packet */

        {

                int i;

                for (i = 0; i < 64; i++) {

                        if ((i % 16) == 0)

                                printk ("\n");

                        printk ("%2.2x ", skb->data [i]);

                }

        }

#endif

        len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;

        entry = lp->tx_new & lp->tx_ring_mod_mask;

        ib->btx_ring [entry].length = (-len) | 0xf000;

        ib->btx_ring [entry].misc = 0;

        if(skb->len < ETH_ZLEN)

                memset((char *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);

        memcpy ((char *)&ib->tx_buf [entry][0], skb->data, skblen);

        /* 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) & lp->tx_ring_mod_mask;

        outs++;

        /* Kick the lance: transmit now */

        WRITERDP(LE_C0_INEA | LE_C0_TDMD);

        dev->trans_start = jiffies;

        dev_kfree_skb (skb);

        spin_lock_irqsave (&lp->devlock, flags);

        if (TX_BUFFS_AVAIL)

                netif_start_queue (dev);

        else

                lp->tx_full = 1;

        spin_unlock_irqrestore (&lp->devlock, flags);

        return 0;

}

struct net_device_stats *lance_get_stats (struct net_device *dev)

{

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

        return &lp->stats;

}

/* taken from the depca driver via a2065.c */

static void lance_load_multicast (struct net_device *dev)

{

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

        volatile struct lance_init_block *ib = lp->init_block;

        volatile u16 *mcast_table = (u16 *)&ib->filter;

        struct dev_mc_list *dmi=dev->mc_list;

        char *addrs;

        int i;

        u32 crc;

        /* set all multicast bits */

        if (dev->flags & IFF_ALLMULTI){

                ib->filter [0] = 0xffffffff;

                ib->filter [1] = 0xffffffff;

                return;

        }

        /* clear the multicast filter */

        ib->filter [0] = 0;

        ib->filter [1] = 0;

        /* Add addresses */

        for (i = 0; i < dev->mc_count; i++){

                addrs = dmi->dmi_addr;

                dmi   = dmi->next;

                /* multicast address? */

                if (!(*addrs & 1))

                        continue;

                crc = ether_crc_le(6, addrs);

                crc = crc >> 26;

                mcast_table [crc >> 4] |= 1 << (crc & 0xf);

        }

        return;

}

void lance_set_multicast (struct net_device *dev)

{

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

        volatile struct lance_init_block *ib = lp->init_block;

        int stopped;

        DECLARE_LL;

        stopped = netif_queue_stopped(dev);

        if (!stopped)

                netif_stop_queue (dev);

        while (lp->tx_old != lp->tx_new)

                schedule();

        WRITERAP(LE_CSR0);

        WRITERDP(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);

        if (!stopped)

                netif_start_queue (dev);

}

MODULE_LICENSE("GPL");