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/* Linux/68k Hydra Amiganet board driver v2.1 BETA                          */

/* copyleft by Topi Kanerva (topi@susanna.oulu.fi)                          */

/* also some code & lots of fixes by Timo Rossi (trossi@cc.jyu.fi)          */

/* The code is mostly based on the linux/68k Ariadne driver                 */

/* copyrighted by Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be) */

/* and Peter De Schrijver (Peter.DeSchrijver@linux.cc.kuleuven.ac.be)       */

/* This file is subject to the terms and conditions of the GNU General      */

/* Public License.  See the file COPYING in the main directory of the       */

/* Linux distribution for more details.                                     */

/* The Amiganet is a Zorro-II board made by Hydra Systems. It contains a    */

/* NS8390 NIC (network interface controller) clone, 16 or 64K on-board RAM  */

/* and 10BASE-2 (thin coax) and AUI connectors.                             */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/string.h>

#include <linux/ptrace.h>

#include <linux/errno.h>

#include <linux/ioport.h>

#include <linux/malloc.h>

#include <linux/interrupt.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include <asm/bitops.h>

#include <asm/io.h>

#include <asm/irq.h>

#include <asm/bootinfo.h>

#include <asm/amigaints.h>

#include <asm/amigahw.h>

#include <asm/zorro.h>

#include "hydra.h"

#define HYDRA_DEBUG

#undef HAVE_MULTICAST

#define HYDRA_VERSION "v2.1 BETA"

#undef HYDRA_DEBUG        /* define this for (lots of) debugging information */

#if 0                         /* currently hardwired to one transmit buffer */

 #define TX_RING_SIZE   5

 #define RX_RING_SIZE   16

#else

 #define TX_RING_SIZE 1

 #define RX_RING_SIZE 8

#endif

#define ETHER_MIN_LEN 64

#define ETHER_MAX_LEN 1518

#define ETHER_ADDR_LEN 6

/*

 *   let's define here nice macros for writing and reading NIC registers

 *

 * the CIA accesses here are uses to make sure the minimum time

 * requirement between NIC chip selects is met.

 */

#define WRITE_REG(reg, val) (ciaa.pra, ((u_char)(*(nicbase+(reg))=val)))

#define READ_REG(reg) (ciaa.pra, ((u_char)(*(nicbase+(reg)))))

/* mask value for the interrupts we use */

#define NIC_INTS (ISR_PRX | ISR_PTX | ISR_RXE | ISR_TXE | ISR_OVW | ISR_CNT)

/* only broadcasts, no promiscuous mode for now */

#define NIC_RCRBITS (0)

/*

 *   Private Device Data

 */

struct hydra_private

    {

    u_char *hydra_base;

    u_char *hydra_nic_base;

    u_short tx_page_start;

    u_short rx_page_start;

    u_short rx_page_stop;

    u_short next_pkt;

    struct enet_statistics stats;

    int key;

    };

static int hydra_open(struct device *dev);

static int hydra_start_xmit(struct sk_buff *skb, struct device *dev);

static void hydra_interrupt(int irq, struct pt_regs *fp, void *data);

static void __inline__ hydra_rx(struct device *dev, struct hydra_private *priv, volatile u_char *nicbase);

static int hydra_close(struct device *dev);

static struct enet_statistics *hydra_get_stats(struct device *dev);

#ifdef HAVE_MULTICAST

static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);

#endif

/* this is now coherent with the C version below, */

/* compile the source with -D__USE_ASM__ if you   */

/* want it - it'll only be some 10% faster though */

#if defined (__GNUC__) && defined (__mc68000__) && defined (USE_ASM)

static __inline__ void *memcpyw(u_short *dest, u_short *src, int len)

    {

    __asm__("   move.l %0,%/a1; move.l %1,%/a0; move.l %2,%/d0 \n\t"

            "   cmpi.l #2,%/d0 \n\t"

            "1: bcs.s  2f \n\t"

            "   move.w %/a0@+,%/a1@+ \n\t"

            "   subq.l #2,%/d0 \n\t"

            "   bra.s  1b \n\t"

            "2: cmpi.l #1,%/d0 \n\t"

            "   bne.s  3f \n\t"

            "   move.w %/a0@,%/d0 \n\t"

            "   swap.w %/d0 \n\t"

            "   move.b %/d0,%/a1@ \n\t"

            "3: moveq  #0,%/d0 \n\t"

          :

          : "g" (dest), "g" (src), "g" (len)

          : "a1", "a0", "d0");

    return;

}

#else

/* hydra memory can only be read or written as words or longwords.  */

/* that will mean that we'll have to write a special memcpy for it. */

/* this one here relies on the fact that _writes_ to hydra memory   */

/* are guaranteed to be of even length. (reads can be arbitrary)    */

static void memcpyw(u_short *dest, u_short *src, int len)

{

  if(len & 1)

    len++;

  while (len >= 2) {

    *(dest++) = *(src++);

    len -= 2;

  }

}

#endif

int hydra_probe(struct device *dev)

    {

    struct hydra_private *priv;

    u_long board;

    int key;

    struct ConfigDev *cd;

    int j;

#ifdef HYDRA_DEBUG

 printk("hydra_probe(%x)\n", dev);

#endif

    if ((key = zorro_find(MANUF_HYDRA_SYSTEMS, PROD_AMIGANET, 0, 0))) {

        cd = zorro_get_board(key);

        if((board = (u_long) cd->cd_BoardAddr))

            {

            for(j = 0; j < ETHER_ADDR_LEN; j++)

                dev->dev_addr[j] = *((u_char *)ZTWO_VADDR(board + HYDRA_ADDRPROM + 2*j));

            printk("%s: hydra at 0x%08x, address %02x:%02x:%02x:%02x:%02x:%02x (hydra.c " HYDRA_VERSION ")\n",

                   dev->name, (int)board, dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],

                   dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);

            init_etherdev(dev, 0);

            dev->priv = kmalloc(sizeof(struct hydra_private), GFP_KERNEL);

            priv = (struct hydra_private *)dev->priv;

            memset(priv, 0, sizeof(struct hydra_private));

            priv->hydra_base = (u_char *) ZTWO_VADDR(board);

            priv->hydra_nic_base = (u_char *) ZTWO_VADDR(board) + HYDRA_NIC_BASE;

            priv->key = key;

            dev->open = &hydra_open;

            dev->stop = &hydra_close;

            dev->hard_start_xmit = &hydra_start_xmit;

            dev->get_stats = &hydra_get_stats;

#ifdef HAVE_MULTICAST

            dev->set_multicast_list = &hydra_set_multicast_list;

#endif

            zorro_config_board(key, 0);

            return(0);

            }

        }

    return(ENODEV);

    }

static int hydra_open(struct device *dev)

  {

    struct hydra_private *priv = (struct hydra_private *)dev->priv;

    volatile u_char *nicbase = priv->hydra_nic_base;

#ifdef HAVE_MULTICAST

    int i;

#endif

#ifdef HYDRA_DEBUG

 printk("hydra_open(0x%x)\n", dev);

#endif

    /* first, initialize the private structure */

    priv->tx_page_start = 0;   /* these are 256 byte buffers for NS8390 */

    priv->rx_page_start = 6;

    priv->rx_page_stop  = 62;  /* these values are hard coded for now */

    /* Reset the NS8390 NIC */

    WRITE_REG(NIC_CR, CR_PAGE0 | CR_NODMA | CR_STOP);

    /* be sure that the NIC is in stopped state */

    while(!(READ_REG(NIC_ISR) & ISR_RST));

    /* word transfer, big endian bytes, loopback, FIFO threshold 4 bytes */

    WRITE_REG(NIC_DCR, DCR_WTS | DCR_BOS | DCR_LS | DCR_FT0);

    /* clear remote byte count registers */

    WRITE_REG(NIC_RBCR0, 0);

    WRITE_REG(NIC_RBCR1, 0);

    /* accept packets addressed to this card and also broadcast packets */

    WRITE_REG(NIC_RCR, NIC_RCRBITS);

    /* enable loopback mode 1 */

    WRITE_REG(NIC_TCR, TCR_LB1);

    /* initialize receive buffer ring */

    WRITE_REG(NIC_PSTART, priv->rx_page_start);

    WRITE_REG(NIC_PSTOP, priv->rx_page_stop);

    WRITE_REG(NIC_BNDRY, priv->rx_page_start);

    /* clear interrupts */

    WRITE_REG(NIC_ISR, 0xff);

    /* enable interrupts */

    WRITE_REG(NIC_IMR, NIC_INTS);

    /* set the ethernet hardware address */

    WRITE_REG(NIC_CR, CR_PAGE1 | CR_NODMA | CR_STOP); /* goto page 1 */

    WRITE_REG(NIC_PAR0, dev->dev_addr[0]);

    WRITE_REG(NIC_PAR1, dev->dev_addr[1]);

    WRITE_REG(NIC_PAR2, dev->dev_addr[2]);

    WRITE_REG(NIC_PAR3, dev->dev_addr[3]);

    WRITE_REG(NIC_PAR4, dev->dev_addr[4]);

    WRITE_REG(NIC_PAR5, dev->dev_addr[5]);

#ifdef HAVE_MULTICAST

    /* clear multicast hash table */

    for(i = 0; i < 8; i++)

      WRITE_REG(NIC_MAR0 + 2*i, 0);

#endif

    priv->next_pkt = priv->rx_page_start+1; /* init our s/w variable */

    WRITE_REG(NIC_CURR, priv->next_pkt);    /* set the next buf for current */

    /* goto page 0, start NIC */

    WRITE_REG(NIC_CR, CR_PAGE0 | CR_NODMA | CR_START);

    /* take interface out of loopback */

    WRITE_REG(NIC_TCR, 0);

    dev->tbusy = 0;

    dev->interrupt = 0;

    dev->start = 1;

    if(!add_isr(IRQ_AMIGA_PORTS, hydra_interrupt, 0, dev, "Hydra Ethernet"))

      return(-EAGAIN);

    MOD_INC_USE_COUNT;

    return(0);

  }

static int hydra_close(struct device *dev)

{

  struct hydra_private *priv = (struct hydra_private *)dev->priv;

  volatile u_char *nicbase = priv->hydra_nic_base;

  int n = 5000;

  dev->start = 0;

  dev->tbusy = 1;

#ifdef HYDRA_DEBUG

  printk("%s: Shutting down ethercard\n", dev->name);

  printk("%s: %d packets missed\n", dev->name, priv->stats.rx_missed_errors);

#endif

  WRITE_REG(NIC_CR, CR_PAGE0 | CR_NODMA | CR_STOP);

  /* wait for NIC to stop (what a nice timeout..) */

  while(((READ_REG(NIC_ISR) & ISR_RST) == 0) && --n);

  remove_isr(IRQ_AMIGA_PORTS, hydra_interrupt, dev);

  MOD_DEC_USE_COUNT;

  return(0);

}

static void hydra_interrupt(int irq, struct pt_regs *fp, void *data)

    {

    volatile u_char *nicbase;

    struct device *dev = (struct device *) data;

    struct hydra_private *priv;

    u_short intbits;

    if(dev == NULL)

        {

        printk("hydra_interrupt(): irq for unknown device\n");

        return;

        }

/* this is not likely a problem - i think */

    if(dev->interrupt)

        printk("%s: re-entering the interrupt handler\n", dev->name);

    dev->interrupt = 1;

    priv = (struct hydra_private *) dev->priv;

    nicbase = (u_char *) priv->hydra_nic_base;

    /* select page 0 */

    WRITE_REG(NIC_CR, CR_PAGE0 | CR_START | CR_NODMA);

    intbits = READ_REG(NIC_ISR) & NIC_INTS;

    if(intbits == 0)

        {

        dev->interrupt = 0;

        return;

        }

        /* acknowledge all interrupts, by clearing the interrupt flag */

        WRITE_REG(NIC_ISR, intbits);

        if((intbits & ISR_PTX) && !(intbits & ISR_TXE))

            {

            dev->tbusy = 0;

            mark_bh(NET_BH);

            }

        if((intbits & ISR_PRX) && !(intbits & ISR_RXE))/* packet received OK */

              hydra_rx(dev, priv, nicbase);

        if(intbits & ISR_TXE)

            priv->stats.tx_errors++;

        if(intbits & ISR_RXE)

            priv->stats.rx_errors++;

        if(intbits & ISR_CNT) {

          /*

           * read the tally counters and (currently) ignore the values

           * might be useful because of bugs of some versions of the 8390 NIC

           */

#ifdef HYDRA_DEBUG

          printk("hydra_interrupt(): ISR_CNT\n");

#endif

          (void)READ_REG(NIC_CNTR0);

          (void)READ_REG(NIC_CNTR1);

          (void)READ_REG(NIC_CNTR2);

        }

        if(intbits & ISR_OVW)

            {

            #ifdef HYDRA_DEBUG

            WRITE_REG(NIC_CR, CR_PAGE1 | CR_START | CR_NODMA);

/* another one just too much for me to comprehend - basically this could  */

/* only occur because of invalid access to hydra ram, thus invalidating  */

/* the interrupt bits read - in average usage these do not occur at all */

            printk("hydra_interrupt(): overwrite warning, NIC_ISR %02x, NIC_CURR %02x\n",

                 intbits, READ_REG(NIC_CURR));

            WRITE_REG(NIC_CR, CR_PAGE0 | CR_START | CR_NODMA);

            #endif

            /* overwrite warning occurred, stop NIC & check the BOUNDARY pointer */

            /* FIXME - real overwrite handling needed !! */

            printk("hydra_interrupt(): overwrite warning, resetting NIC\n");

            WRITE_REG(NIC_CR, CR_PAGE0 | CR_NODMA | CR_STOP);

            while(!(READ_REG(NIC_ISR) & ISR_RST));

            /* wait for NIC to reset */

            WRITE_REG(NIC_DCR, DCR_WTS | DCR_BOS | DCR_LS | DCR_FT0);

            WRITE_REG(NIC_RBCR0, 0);

            WRITE_REG(NIC_RBCR1, 0);

            WRITE_REG(NIC_RCR, NIC_RCRBITS);

            WRITE_REG(NIC_TCR, TCR_LB1);

            WRITE_REG(NIC_PSTART, priv->rx_page_start);

            WRITE_REG(NIC_PSTOP, priv->rx_page_stop);

            WRITE_REG(NIC_BNDRY, priv->rx_page_start);

            WRITE_REG(NIC_ISR, 0xff);

            WRITE_REG(NIC_IMR, NIC_INTS);

/* currently this _won't_ reset my hydra, even though it is */

/* basically the same code as in the board init - any ideas? */

            priv->next_pkt = priv->rx_page_start+1; /* init our s/w variable */

            WRITE_REG(NIC_CURR, priv->next_pkt);    /* set the next buf for current */

            WRITE_REG(NIC_CR, CR_PAGE0 | CR_NODMA | CR_START);

            WRITE_REG(NIC_TCR, 0);

            }

    dev->interrupt = 0;

    return;

    }

/*

 * packet transmit routine

 */

static int hydra_start_xmit(struct sk_buff *skb, struct device *dev)

    {

    struct hydra_private *priv = (struct hydra_private *)dev->priv;

    volatile u_char *nicbase = priv->hydra_nic_base;

    int len, len1;

        /* Transmitter timeout, serious problems. */

    if(dev->tbusy)

        {

        int tickssofar = jiffies - dev->trans_start;

        if(tickssofar < 20)

            return(1);

        WRITE_REG(NIC_CR, CR_STOP);

        printk("%s: transmit timed out, status %4.4x, resetting.\n", dev->name, 0);

        priv->stats.tx_errors++;

        dev->tbusy = 0;

        dev->trans_start = jiffies;

        dev_kfree_skb(skb, FREE_WRITE);

        return(0);

        }

    if(skb == NULL)

        {

        dev_tint(dev);

        return(0);

        }

    if((len = skb->len) <= 0)

        return(0);

    /* fill in a tx ring entry */

#ifdef HYDRA_DEBUG

 printk("TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);

        {

                int i;

                u_char *ptr = &((u_char *)skb->data)[6];

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

                        printk("%02x", ptr[i]);

        }

        printk(" to ");

        {

                int i;

                u_char *ptr = (u_char *)skb->data;

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

                        printk("%02x", ptr[i]);

        }

        printk(" data 0x%08x len %d\n", (int)skb->data, len);

#endif

    /*

     * make sure that the packet size is at least the minimum

     * allowed ethernet packet length.

     * (possibly should also clear the unused space...)

     * note: minimum packet length is 64, including CRC

     */

    len1 = len;

    if(len < (ETHER_MIN_LEN-4))

        len = (ETHER_MIN_LEN-1);

    /* make sure we've got an even number of bytes to copy to hydra's mem */

    if(len & 1) len++;

    if((u_long)(priv->hydra_base + (priv->tx_page_start << 8)) < 0x80000000)

      printk("weirdness: memcpyw(txbuf, skbdata, len): txbuf = 0x%x\n", (u_int)(priv->hydra_base+(priv->tx_page_start<<8)));

    /* copy the packet data to the transmit buffer

       in the ethernet card RAM */

    memcpyw((u_short *)(priv->hydra_base + (priv->tx_page_start << 8)),

            (u_short *)skb->data, len);

    /* clear the unused space */

/*    for(; len1<len; len1++)

      (u_short)*(priv->hydra_base + (priv->tx_page_start<<8) + len1) = 0;

*/

    dev_kfree_skb(skb, FREE_WRITE);

    priv->stats.tx_packets++;

    cli();

    /* make sure we are on the correct page */

    WRITE_REG(NIC_CR, CR_PAGE0 | CR_NODMA | CR_START);

    /* here we configure the transmit page start register etc */

    /* notice that this code is hardwired to one transmit buffer */

    WRITE_REG(NIC_TPSR, priv->tx_page_start);

    WRITE_REG(NIC_TBCR0, len & 0xff);

    WRITE_REG(NIC_TBCR1, len >> 8);

    /* commit the packet to the wire */

    WRITE_REG(NIC_CR, CR_PAGE0 | CR_START | CR_NODMA | CR_TXP);

    sti();

    dev->trans_start = jiffies;

    return(0);

    }

static void __inline__ hydra_rx(struct device *dev, struct hydra_private *priv, volatile u_char *nicbase)

    {

    volatile u_short *board_ram_ptr;

    struct sk_buff *skb;

    int hdr_next_pkt, pkt_len, len1, boundary;

    /* remove packet(s) from the ring and commit them to TCP layer */

    WRITE_REG(NIC_CR, CR_PAGE1 | CR_NODMA | CR_START); /* page 1 */

    while(priv->next_pkt != READ_REG(NIC_CURR)) /* should read this only once? */

      {

        board_ram_ptr = (u_short *)(priv->hydra_base + (priv->next_pkt << 8));

#ifdef HYDRA_DEBUG

        printk("next_pkt = 0x%x, board_ram_ptr = 0x%x\n", priv->next_pkt, board_ram_ptr);

#endif

        /* the following must be done with two steps, or

           GCC optimizes it to a byte access to Hydra memory,

           which doesn't work... */

        hdr_next_pkt = board_ram_ptr[0];

        hdr_next_pkt >>= 8;

        pkt_len = board_ram_ptr[1];

        pkt_len = ((pkt_len >> 8) | ((pkt_len & 0xff) << 8));

#ifdef HYDRA_DEBUG

        printk("hydra_interrupt(): hdr_next_pkt = 0x%02x, len = %d\n", hdr_next_pkt, pkt_len);

#endif

        if(pkt_len >= ETHER_MIN_LEN && pkt_len <= ETHER_MAX_LEN)

          {

            /* note that board_ram_ptr is u_short */

            /* CRC is not included in the packet length */

            pkt_len -= 4;

            skb = dev_alloc_skb(pkt_len+2);

            if(skb == NULL)

              {

                printk("%s: memory squeeze, dropping packet.\n", dev->name);

                priv->stats.rx_dropped++;

              }

            else

              {

                skb->dev = dev;

                skb_reserve(skb, 2);

                if(hdr_next_pkt < priv->next_pkt && hdr_next_pkt != priv->rx_page_start)

                  {

                    /* here, the packet is wrapped */

                    len1 = ((priv->rx_page_stop - priv->next_pkt)<<8)-4;

                    memcpyw((u_short *)skb_put(skb, len1), (u_short *)(board_ram_ptr+2), len1);

                    memcpyw((u_short *)skb_put(skb, pkt_len-len1),  (u_short *)(priv->hydra_base+(priv->rx_page_start<<8)), pkt_len-len1);

#ifdef HYDRA_DEBUG

                    printk("wrapped packet: %d/%d bytes\n", len1, pkt_len-len1);

#endif

                  }  /* ... here, packet is not wrapped */

                else memcpyw((u_short *) skb_put(skb, pkt_len), (u_short *)(board_ram_ptr+2), pkt_len);

              }

            /* if(skb == NULL) ... */

          }

        else

          {

            WRITE_REG(NIC_CR, CR_PAGE1 | CR_START | CR_NODMA);

            printk("hydra_interrupt(): invalid packet len: %d, NIC_CURR = %02x\n", pkt_len, READ_REG(NIC_CURR));

/*

this is the error i kept getting until i switched to 0.9.10. it still doesn't

mean that the bug would have gone away - so be alarmed. the packet is likely

being fetched from a wrong memory location - but why - dunno

note-for-v2.1: not really problem anymore. hasn't been for a long time.

*/

            WRITE_REG(NIC_CR, CR_PAGE0 | CR_START | CR_NODMA);

            /* should probably reset the NIC here ?? */

            hydra_open(dev);  /* FIXME - i shouldn't really be doing this. */

            return;

          }

        /* now, update the next_pkt pointer */

        if(hdr_next_pkt < priv->rx_page_stop) priv->next_pkt = hdr_next_pkt;

        else printk("hydra_interrupt(): invalid next_pkt pointer %d\n", hdr_next_pkt);

        /* update the boundary pointer */

        boundary = priv->next_pkt - 1;

        if(boundary < priv->rx_page_start)

          boundary = priv->rx_page_stop - 1;

        /* set NIC to page 0 to update the NIC_BNDRY register */

        WRITE_REG(NIC_CR, CR_PAGE0 | CR_START | CR_NODMA);

        WRITE_REG(NIC_BNDRY, boundary);

        /* select page1 to access the NIC_CURR register */

        WRITE_REG(NIC_CR, CR_PAGE1 | CR_START | CR_NODMA);

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

        netif_rx(skb);

        priv->stats.rx_packets++;

      }

    return;

    }

static struct enet_statistics *hydra_get_stats(struct device *dev)

{

        struct hydra_private *priv = (struct hydra_private *)dev->priv;

#if 0

        u_char *board = priv->hydra_base;

        short saved_addr;

#endif

/* currently does nothing :) i'll finish this later */

        return(&priv->stats);

}

#ifdef HAVE_MULTICAST

static void set_multicast_list(struct device *dev, int num_addrs, void *addrs)

    {

    struct hydra_private *priv = (struct hydra_private *)dev->priv;

    u_char *board = priv->hydra_base;

    /* yes, this code is also waiting for someone to complete.. :) */

    /* (personally i don't care about multicasts at all :) */

    return;

    }

#endif

#ifdef MODULE

static char devicename[9] = { 0, };

static struct device hydra_dev =

{

        devicename,                     /* filled in by register_netdev() */