Logo Search packages:      
Sourcecode: linux version File versions  Download package

declance.c

/*
 *    Lance ethernet driver for the MIPS processor based
 *      DECstation family
 *
 *
 *      adopted from sunlance.c by Richard van den Berg
 *
 *      Copyright (C) 2002, 2003, 2005, 2006  Maciej W. Rozycki
 *
 *      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
 *
 *      v0.009: Module support fixes, multiple interfaces support, various
 *              bits. macro
 *
 *      v0.010: Fixes for the PMAD mapping of the LANCE buffer and for the
 *              PMAX requirement to only use halfword accesses to the
 *              buffer. macro
 *
 *      v0.011: Converted the PMAD to the driver model. macro
 */

#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/tc.h>
#include <linux/types.h>

#include <asm/addrspace.h>
#include <asm/system.h>

#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/kn01.h>
#include <asm/dec/machtype.h>
#include <asm/dec/system.h>

static char version[] __devinitdata =
"declance.c: v0.011 by Linux MIPS DECstation task force\n";

MODULE_AUTHOR("Linux MIPS DECstation task force");
MODULE_DESCRIPTION("DEC LANCE (DECstation onboard, PMAD-xx) driver");
MODULE_LICENSE("GPL");

#define __unused __attribute__ ((unused))

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


#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 0x8000      /* Who owns the entry */
#define LE_R1_ERR 0x4000      /* Error: if FRA, OFL, CRC or BUF is set */
#define LE_R1_FRA 0x2000      /* FRA: Frame error */
#define LE_R1_OFL 0x1000      /* OFL: Frame overflow */
#define LE_R1_CRC 0x0800      /* CRC error */
#define LE_R1_BUF 0x0400      /* BUF: Buffer error */
#define LE_R1_SOP 0x0200      /* Start of packet */
#define LE_R1_EOP 0x0100      /* End of packet */
#define LE_R1_POK 0x0300      /* Packet is complete: SOP + EOP */

/* Transmit message descriptor 1 */
#define LE_T1_OWN 0x8000      /* Lance owns the packet */
#define LE_T1_ERR 0x4000      /* Error summary */
#define LE_T1_EMORE     0x1000      /* Error: more than one retry needed */
#define LE_T1_EONE      0x0800      /* Error: one retry needed */
#define LE_T1_EDEF      0x0400      /* Error: deferred */
#define LE_T1_SOP 0x0200      /* Start of packet */
#define LE_T1_EOP 0x0100      /* End of packet */
#define LE_T1_POK 0x0300      /* 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

#undef TEST_HITS
#define ZERO 0

/*
 * The DS2100/3100 have a linear 64 kB buffer which supports halfword
 * accesses only.  Each halfword of the buffer is word-aligned in the
 * CPU address space.
 *
 * The PMAD-AA has a 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 short rmd1;          /* high address of packet
                                 and descriptor bits */
      short length;                 /* 2s complement (negative!)
                                 of buffer length */
      unsigned short mblength;      /* actual number of bytes received */
};

struct lance_tx_desc {
      unsigned short tmd0;          /* low address of packet */
      unsigned short tmd1;          /* high address of packet
                                 and descriptor bits */
      short length;                 /* 2s complement (negative!)
                                 of buffer length */
      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 short phys_addr[3];  /* physical ethernet address */
      unsigned short filter[4];     /* 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 */

      short gap[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)

#define shift_off(off, type)                                \
      (type == ASIC_LANCE || type == PMAX_LANCE ? off << 1 : off)

#define lib_off(rt, type)                                   \
      shift_off(offsetof(struct lance_init_block, rt), type)

#define lib_ptr(ib, rt, type)                                     \
      ((volatile u16 *)((u8 *)(ib) + lib_off(rt, type)))

#define rds_off(rt, type)                                   \
      shift_off(offsetof(struct lance_rx_desc, rt), type)

#define rds_ptr(rd, rt, type)                                     \
      ((volatile u16 *)((u8 *)(rd) + rds_off(rt, type)))

#define tds_off(rt, type)                                   \
      shift_off(offsetof(struct lance_tx_desc, rt), type)

#define tds_ptr(td, rt, type)                                     \
      ((volatile u16 *)((u8 *)(td) + tds_off(rt, type)))

struct lance_private {
      struct net_device *next;
      int type;
      int dma_irq;
      volatile struct lance_regs *ll;

      spinlock_t  lock;

      int rx_new, tx_new;
      int rx_old, tx_old;

      unsigned short busmaster_regval;

      struct timer_list       multicast_timer;

      /* 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 */
      uint rx_buf_ptr_lnc[RX_RING_SIZE];
      uint 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
 * dependent.
 * 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;

static struct tc_driver dec_lance_tc_driver;
static struct net_device *root_lance_dev;

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

/* Load the CSR registers */
static void load_csrs(struct lance_private *lp)
{
      volatile struct lance_regs *ll = lp->ll;
      uint 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
 *
 */
static void cp_to_buf(const int type, void *to, const void *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++;
                  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++;
            }
      }

      iob();
}

static void cp_from_buf(const int type, void *to, const void *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 */
static void lance_init_ring(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      uint leptr;
      int i;

      /* Lock out other processes while setting up hardware */
      netif_stop_queue(dev);
      lp->rx_new = lp->tx_new = 0;
      lp->rx_old = lp->tx_old = 0;

      /* Copy the ethernet address to the lance init block.
       * XXX bit 0 of the physical address registers has to be zero
       */
      *lib_ptr(ib, phys_addr[0], lp->type) = (dev->dev_addr[1] << 8) |
                             dev->dev_addr[0];
      *lib_ptr(ib, phys_addr[1], lp->type) = (dev->dev_addr[3] << 8) |
                             dev->dev_addr[2];
      *lib_ptr(ib, phys_addr[2], lp->type) = (dev->dev_addr[5] << 8) |
                             dev->dev_addr[4];
      /* Setup the initialization block */

      /* Setup rx descriptor pointer */
      leptr = offsetof(struct lance_init_block, brx_ring);
      *lib_ptr(ib, rx_len, lp->type) = (LANCE_LOG_RX_BUFFERS << 13) |
                               (leptr >> 16);
      *lib_ptr(ib, rx_ptr, lp->type) = leptr;
      if (ZERO)
            printk("RX ptr: %8.8x(%8.8x)\n",
                   leptr, lib_off(brx_ring, lp->type));

      /* Setup tx descriptor pointer */
      leptr = offsetof(struct lance_init_block, btx_ring);
      *lib_ptr(ib, tx_len, lp->type) = (LANCE_LOG_TX_BUFFERS << 13) |
                               (leptr >> 16);
      *lib_ptr(ib, tx_ptr, lp->type) = leptr;
      if (ZERO)
            printk("TX ptr: %8.8x(%8.8x)\n",
                   leptr, lib_off(btx_ring, lp->type));

      if (ZERO)
            printk("TX rings:\n");

      /* Setup the Tx ring entries */
      for (i = 0; i < TX_RING_SIZE; i++) {
            leptr = lp->tx_buf_ptr_lnc[i];
            *lib_ptr(ib, btx_ring[i].tmd0, lp->type) = leptr;
            *lib_ptr(ib, btx_ring[i].tmd1, lp->type) = (leptr >> 16) &
                                             0xff;
            *lib_ptr(ib, btx_ring[i].length, lp->type) = 0xf000;
                                    /* The ones required by tmd2 */
            *lib_ptr(ib, btx_ring[i].misc, lp->type) = 0;
            if (i < 3 && ZERO)
                  printk("%d: 0x%8.8x(0x%8.8x)\n",
                         i, leptr, (uint)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 = lp->rx_buf_ptr_lnc[i];
            *lib_ptr(ib, brx_ring[i].rmd0, lp->type) = leptr;
            *lib_ptr(ib, brx_ring[i].rmd1, lp->type) = ((leptr >> 16) &
                                              0xff) |
                                             LE_R1_OWN;
            *lib_ptr(ib, brx_ring[i].length, lp->type) = -RX_BUFF_SIZE |
                                               0xf000;
            *lib_ptr(ib, brx_ring[i].mblength, lp->type) = 0;
            if (i < 3 && ZERO)
                  printk("%d: 0x%8.8x(0x%8.8x)\n",
                         i, leptr, (uint)lp->rx_buf_ptr_cpu[i]);
      }
      iob();
}

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 net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      volatile u16 *rd;
      unsigned short bits;
      int entry, len;
      struct sk_buff *skb;

#ifdef TEST_HITS
      {
            int i;

            printk("[");
            for (i = 0; i < RX_RING_SIZE; i++) {
                  if (i == lp->rx_new)
                        printk("%s", *lib_ptr(ib, brx_ring[i].rmd1,
                                          lp->type) &
                                   LE_R1_OWN ? "_" : "X");
                  else
                        printk("%s", *lib_ptr(ib, brx_ring[i].rmd1,
                                          lp->type) &
                                   LE_R1_OWN ? "." : "1");
            }
            printk("]");
      }
#endif

      for (rd = lib_ptr(ib, brx_ring[lp->rx_new], lp->type);
           !((bits = *rds_ptr(rd, rmd1, lp->type)) & LE_R1_OWN);
           rd = lib_ptr(ib, brx_ring[lp->rx_new], lp->type)) {
            entry = lp->rx_new;

            /* We got an incomplete frame? */
            if ((bits & LE_R1_POK) != LE_R1_POK) {
                  dev->stats.rx_over_errors++;
                  dev->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)
                        dev->stats.rx_fifo_errors++;
                  if (bits & LE_R1_CRC)
                        dev->stats.rx_crc_errors++;
                  if (bits & LE_R1_OFL)
                        dev->stats.rx_over_errors++;
                  if (bits & LE_R1_FRA)
                        dev->stats.rx_frame_errors++;
                  if (bits & LE_R1_EOP)
                        dev->stats.rx_errors++;
            } else {
                  len = (*rds_ptr(rd, mblength, lp->type) & 0xfff) - 4;
                  skb = dev_alloc_skb(len + 2);

                  if (skb == 0) {
                        printk("%s: Memory squeeze, deferring packet.\n",
                               dev->name);
                        dev->stats.rx_dropped++;
                        *rds_ptr(rd, mblength, lp->type) = 0;
                        *rds_ptr(rd, rmd1, lp->type) =
                              ((lp->rx_buf_ptr_lnc[entry] >> 16) &
                               0xff) | LE_R1_OWN;
                        lp->rx_new = (entry + 1) & RX_RING_MOD_MASK;
                        return 0;
                  }
                  dev->stats.rx_bytes += len;

                  skb_reserve(skb, 2);    /* 16 byte align */
                  skb_put(skb, len);      /* make room */

                  cp_from_buf(lp->type, skb->data,
                            (char *)lp->rx_buf_ptr_cpu[entry], len);

                  skb->protocol = eth_type_trans(skb, dev);
                  netif_rx(skb);
                  dev->last_rx = jiffies;
                  dev->stats.rx_packets++;
            }

            /* Return the packet to the pool */
            *rds_ptr(rd, mblength, lp->type) = 0;
            *rds_ptr(rd, length, lp->type) = -RX_BUFF_SIZE | 0xf000;
            *rds_ptr(rd, rmd1, lp->type) =
                  ((lp->rx_buf_ptr_lnc[entry] >> 16) & 0xff) | LE_R1_OWN;
            lp->rx_new = (entry + 1) & RX_RING_MOD_MASK;
      }
      return 0;
}

static void lance_tx(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      volatile struct lance_regs *ll = lp->ll;
      volatile u16 *td;
      int i, j;
      int status;

      j = lp->tx_old;

      spin_lock(&lp->lock);

      for (i = j; i != lp->tx_new; i = j) {
            td = lib_ptr(ib, btx_ring[i], lp->type);
            /* If we hit a packet not owned by us, stop */
            if (*tds_ptr(td, tmd1, lp->type) & LE_T1_OWN)
                  break;

            if (*tds_ptr(td, tmd1, lp->type) & LE_T1_ERR) {
                  status = *tds_ptr(td, misc, lp->type);

                  dev->stats.tx_errors++;
                  if (status & LE_T3_RTY)
                        dev->stats.tx_aborted_errors++;
                  if (status & LE_T3_LCOL)
                        dev->stats.tx_window_errors++;

                  if (status & LE_T3_CLOS) {
                        dev->stats.tx_carrier_errors++;
                        printk("%s: Carrier Lost\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);
                        goto out;
                  }
                  /* Buffer errors and underflows turn off the
                   * transmitter, restart the adapter.
                   */
                  if (status & (LE_T3_BUF | LE_T3_UFL)) {
                        dev->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);
                        goto out;
                  }
            } else if ((*tds_ptr(td, tmd1, lp->type) & LE_T1_POK) ==
                     LE_T1_POK) {
                  /*
                   * So we don't count the packet more than once.
                   */
                  *tds_ptr(td, tmd1, lp->type) &= ~(LE_T1_POK);

                  /* One collision before packet was sent. */
                  if (*tds_ptr(td, tmd1, lp->type) & LE_T1_EONE)
                        dev->stats.collisions++;

                  /* More than one collision, be optimistic. */
                  if (*tds_ptr(td, tmd1, lp->type) & LE_T1_EMORE)
                        dev->stats.collisions += 2;

                  dev->stats.tx_packets++;
            }
            j = (j + 1) & TX_RING_MOD_MASK;
      }
      lp->tx_old = j;
out:
      if (netif_queue_stopped(dev) &&
          TX_BUFFS_AVAIL > 0)
            netif_wake_queue(dev);

      spin_unlock(&lp->lock);
}

static irqreturn_t lance_dma_merr_int(const int irq, void *dev_id)
{
      struct net_device *dev = dev_id;

      printk("%s: DMA error\n", dev->name);
      return IRQ_HANDLED;
}

static irqreturn_t lance_interrupt(const int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct lance_private *lp = netdev_priv(dev);
      volatile struct lance_regs *ll = lp->ll;
      int csr0;

      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 (csr0 & LE_C0_BABL)
            dev->stats.tx_errors++;

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

      if (csr0 & LE_C0_MERR) {
            printk("%s: Memory error, status %04x\n", dev->name, csr0);

            writereg(&ll->rdp, LE_C0_STOP);

            lance_init_ring(dev);
            load_csrs(lp);
            init_restart_lance(lp);
            netif_wake_queue(dev);
      }

      writereg(&ll->rdp, LE_C0_INEA);
      writereg(&ll->rdp, LE_C0_INEA);
      return IRQ_HANDLED;
}

struct net_device *last_dev = 0;

static int lance_open(struct net_device *dev)
{
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      struct lance_private *lp = netdev_priv(dev);
      volatile struct lance_regs *ll = lp->ll;
      int status = 0;

      last_dev = dev;

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

      /* Set mode and clear multicast filter only at device open,
       * so that lance_init_ring() called at any error will not
       * forget multicast filters.
       *
       * BTW it is common bug in all lance drivers! --ANK
       */
      *lib_ptr(ib, mode, lp->type) = 0;
      *lib_ptr(ib, filter[0], lp->type) = 0;
      *lib_ptr(ib, filter[1], lp->type) = 0;
      *lib_ptr(ib, filter[2], lp->type) = 0;
      *lib_ptr(ib, filter[3], lp->type) = 0;

      lance_init_ring(dev);
      load_csrs(lp);

      netif_start_queue(dev);

      /* Associate IRQ with lance_interrupt */
      if (request_irq(dev->irq, &lance_interrupt, 0, "lance", dev)) {
            printk("%s: Can't get IRQ %d\n", dev->name, dev->irq);
            return -EAGAIN;
      }
      if (lp->dma_irq >= 0) {
            unsigned long flags;

            if (request_irq(lp->dma_irq, &lance_dma_merr_int, 0,
                        "lance error", dev)) {
                  free_irq(dev->irq, dev);
                  printk("%s: Can't get DMA IRQ %d\n", dev->name,
                        lp->dma_irq);
                  return -EAGAIN;
            }

            spin_lock_irqsave(&ioasic_ssr_lock, flags);

            fast_mb();
            /* Enable I/O ASIC LANCE DMA.  */
            ioasic_write(IO_REG_SSR,
                       ioasic_read(IO_REG_SSR) | IO_SSR_LANCE_DMA_EN);

            fast_mb();
            spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
      }

      status = init_restart_lance(lp);
      return status;
}

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

      netif_stop_queue(dev);
      del_timer_sync(&lp->multicast_timer);

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

      if (lp->dma_irq >= 0) {
            unsigned long flags;

            spin_lock_irqsave(&ioasic_ssr_lock, flags);

            fast_mb();
            /* Disable I/O ASIC LANCE DMA.  */
            ioasic_write(IO_REG_SSR,
                       ioasic_read(IO_REG_SSR) & ~IO_SSR_LANCE_DMA_EN);

            fast_iob();
            spin_unlock_irqrestore(&ioasic_ssr_lock, flags);

            free_irq(lp->dma_irq, dev);
      }
      free_irq(dev->irq, dev);
      return 0;
}

static inline int lance_reset(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      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;
      status = init_restart_lance(lp);
      return status;
}

static void lance_tx_timeout(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile struct lance_regs *ll = lp->ll;

      printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
            dev->name, ll->rdp);
      lance_reset(dev);
      netif_wake_queue(dev);
}

static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile struct lance_regs *ll = lp->ll;
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      int entry, len;

      len = skb->len;

      if (len < ETH_ZLEN) {
            if (skb_padto(skb, ETH_ZLEN))
                  return 0;
            len = ETH_ZLEN;
      }

      dev->stats.tx_bytes += len;

      entry = lp->tx_new;
      *lib_ptr(ib, btx_ring[entry].length, lp->type) = (-len);
      *lib_ptr(ib, btx_ring[entry].misc, lp->type) = 0;

      cp_to_buf(lp->type, (char *)lp->tx_buf_ptr_cpu[entry], skb->data, len);

      /* Now, give the packet to the lance */
      *lib_ptr(ib, btx_ring[entry].tmd1, lp->type) =
            ((lp->tx_buf_ptr_lnc[entry] >> 16) & 0xff) |
            (LE_T1_POK | LE_T1_OWN);
      lp->tx_new = (entry + 1) & TX_RING_MOD_MASK;

      if (TX_BUFFS_AVAIL <= 0)
            netif_stop_queue(dev);

      /* Kick the lance: transmit now */
      writereg(&ll->rdp, LE_C0_INEA | LE_C0_TDMD);

      dev->trans_start = jiffies;
      dev_kfree_skb(skb);

      return 0;
}

static void lance_load_multicast(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      struct dev_mc_list *dmi = dev->mc_list;
      char *addrs;
      int i;
      u32 crc;

      /* set all multicast bits */
      if (dev->flags & IFF_ALLMULTI) {
            *lib_ptr(ib, filter[0], lp->type) = 0xffff;
            *lib_ptr(ib, filter[1], lp->type) = 0xffff;
            *lib_ptr(ib, filter[2], lp->type) = 0xffff;
            *lib_ptr(ib, filter[3], lp->type) = 0xffff;
            return;
      }
      /* clear the multicast filter */
      *lib_ptr(ib, filter[0], lp->type) = 0;
      *lib_ptr(ib, filter[1], lp->type) = 0;
      *lib_ptr(ib, filter[2], lp->type) = 0;
      *lib_ptr(ib, filter[3], lp->type) = 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(ETH_ALEN, addrs);
            crc = crc >> 26;
            *lib_ptr(ib, filter[crc >> 4], lp->type) |= 1 << (crc & 0xf);
      }
      return;
}

static void lance_set_multicast(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      volatile u16 *ib = (volatile u16 *)dev->mem_start;
      volatile struct lance_regs *ll = lp->ll;

      if (!netif_running(dev))
            return;

      if (lp->tx_old != lp->tx_new) {
            mod_timer(&lp->multicast_timer, jiffies + 4 * HZ/100);
            netif_wake_queue(dev);
            return;
      }

      netif_stop_queue(dev);

      writereg(&ll->rap, LE_CSR0);
      writereg(&ll->rdp, LE_C0_STOP);

      lance_init_ring(dev);

      if (dev->flags & IFF_PROMISC) {
            *lib_ptr(ib, mode, lp->type) |= LE_MO_PROM;
      } else {
            *lib_ptr(ib, mode, lp->type) &= ~LE_MO_PROM;
            lance_load_multicast(dev);
      }
      load_csrs(lp);
      init_restart_lance(lp);
      netif_wake_queue(dev);
}

static void lance_set_multicast_retry(unsigned long _opaque)
{
      struct net_device *dev = (struct net_device *) _opaque;

      lance_set_multicast(dev);
}

static int __init dec_lance_probe(struct device *bdev, const int type)
{
      static unsigned version_printed;
      static const char fmt[] = "declance%d";
      char name[10];
      struct net_device *dev;
      struct lance_private *lp;
      volatile struct lance_regs *ll;
      resource_size_t start = 0, len = 0;
      int i, ret;
      unsigned long esar_base;
      unsigned char *esar;
      DECLARE_MAC_BUF(mac);

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

      if (bdev)
            snprintf(name, sizeof(name), "%s", bdev->bus_id);
      else {
            i = 0;
            dev = root_lance_dev;
            while (dev) {
                  i++;
                  lp = (struct lance_private *)dev->priv;
                  dev = lp->next;
            }
            snprintf(name, sizeof(name), fmt, i);
      }

      dev = alloc_etherdev(sizeof(struct lance_private));
      if (!dev) {
            printk(KERN_ERR "%s: Unable to allocate etherdev, aborting.\n",
                  name);
            ret = -ENOMEM;
            goto err_out;
      }

      /*
       * alloc_etherdev ensures the data structures used by the LANCE
       * are aligned.
       */
      lp = netdev_priv(dev);
      spin_lock_init(&lp->lock);

      lp->type = type;
      switch (type) {
      case ASIC_LANCE:
            dev->base_addr = CKSEG1ADDR(dec_kn_slot_base + IOASIC_LANCE);

            /* buffer space for the on-board LANCE shared memory */
            /*
             * FIXME: ugly hack!
             */
            dev->mem_start = CKSEG1ADDR(0x00020000);
            dev->mem_end = dev->mem_start + 0x00020000;
            dev->irq = dec_interrupt[DEC_IRQ_LANCE];
            esar_base = CKSEG1ADDR(dec_kn_slot_base + IOASIC_ESAR);

            /* Workaround crash with booting KN04 2.1k from Disk */
            memset((void *)dev->mem_start, 0,
                   dev->mem_end - dev->mem_start);

            /*
             * 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 + 2 * BUF_OFFSET_CPU +
                               2 * i * RX_BUFF_SIZE);
                  lp->rx_buf_ptr_lnc[i] =
                        (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 + 2 * BUF_OFFSET_CPU +
                               2 * RX_RING_SIZE * RX_BUFF_SIZE +
                               2 * i * TX_BUFF_SIZE);
                  lp->tx_buf_ptr_lnc[i] =
                        (BUF_OFFSET_LNC +
                         RX_RING_SIZE * RX_BUFF_SIZE +
                         i * TX_BUFF_SIZE);
            }

            /* Setup I/O ASIC LANCE DMA.  */
            lp->dma_irq = dec_interrupt[DEC_IRQ_LANCE_MERR];
            ioasic_write(IO_REG_LANCE_DMA_P,
                       CPHYSADDR(dev->mem_start) << 3);

            break;
#ifdef CONFIG_TC
      case PMAD_LANCE:
            dev_set_drvdata(bdev, dev);

            start = to_tc_dev(bdev)->resource.start;
            len = to_tc_dev(bdev)->resource.end - start + 1;
            if (!request_mem_region(start, len, bdev->bus_id)) {
                  printk(KERN_ERR
                         "%s: Unable to reserve MMIO resource\n",
                         bdev->bus_id);
                  ret = -EBUSY;
                  goto err_out_dev;
            }

            dev->mem_start = CKSEG1ADDR(start);
            dev->mem_end = dev->mem_start + 0x100000;
            dev->base_addr = dev->mem_start + 0x100000;
            dev->irq = to_tc_dev(bdev)->interrupt;
            esar_base = dev->mem_start + 0x1c0002;
            lp->dma_irq = -1;

            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] =
                        (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] =
                        (BUF_OFFSET_LNC +
                         RX_RING_SIZE * RX_BUFF_SIZE +
                         i * TX_BUFF_SIZE);
            }

            break;
#endif
      case PMAX_LANCE:
            dev->irq = dec_interrupt[DEC_IRQ_LANCE];
            dev->base_addr = CKSEG1ADDR(KN01_SLOT_BASE + KN01_LANCE);
            dev->mem_start = CKSEG1ADDR(KN01_SLOT_BASE + KN01_LANCE_MEM);
            dev->mem_end = dev->mem_start + KN01_SLOT_SIZE;
            esar_base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_ESAR + 1);
            lp->dma_irq = -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 + 2 * BUF_OFFSET_CPU +
                               2 * i * RX_BUFF_SIZE);
                  lp->rx_buf_ptr_lnc[i] =
                        (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 + 2 * BUF_OFFSET_CPU +
                               2 * RX_RING_SIZE * RX_BUFF_SIZE +
                               2 * i * TX_BUFF_SIZE);
                  lp->tx_buf_ptr_lnc[i] =
                        (BUF_OFFSET_LNC +
                         RX_RING_SIZE * RX_BUFF_SIZE +
                         i * TX_BUFF_SIZE);
            }

            break;

      default:
            printk(KERN_ERR "%s: declance_init called with unknown type\n",
                  name);
            ret = -ENODEV;
            goto err_out_dev;
      }

      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(KERN_ERR
                  "%s: Ethernet station address prom not found!\n",
                  name);
            ret = -ENODEV;
            goto err_out_resource;
      }
      /* 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(KERN_ERR "%s: Something is wrong with the "
                        "ethernet station address prom!\n", name);
                  ret = -ENODEV;
                  goto err_out_resource;
            }
      }

      /* 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", name);
            break;
      case PMAD_LANCE:
            printk("%s: PMAD-AA", name);
            break;
      case PMAX_LANCE:
            printk("%s: PMAX onboard LANCE", name);
            break;
      }
      for (i = 0; i < 6; i++)
            dev->dev_addr[i] = esar[i * 4];

      printk(", addr = %s, irq = %d\n",
             print_mac(mac, dev->dev_addr), dev->irq);

      dev->open = &lance_open;
      dev->stop = &lance_close;
      dev->hard_start_xmit = &lance_start_xmit;
      dev->tx_timeout = &lance_tx_timeout;
      dev->watchdog_timeo = 5*HZ;
      dev->set_multicast_list = &lance_set_multicast;

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

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

      dev->dma = 0;

      /* We cannot sleep if the chip is busy during a
       * multicast list update event, because such events
       * can occur from interrupts (ex. IPv6).  So we
       * use a timer to try again later when necessary. -DaveM
       */
      init_timer(&lp->multicast_timer);
      lp->multicast_timer.data = (unsigned long) dev;
      lp->multicast_timer.function = &lance_set_multicast_retry;

      ret = register_netdev(dev);
      if (ret) {
            printk(KERN_ERR
                  "%s: Unable to register netdev, aborting.\n", name);
            goto err_out_resource;
      }

      if (!bdev) {
            lp->next = root_lance_dev;
            root_lance_dev = dev;
      }

      printk("%s: registered as %s.\n", name, dev->name);
      return 0;

err_out_resource:
      if (bdev)
            release_mem_region(start, len);

err_out_dev:
      free_netdev(dev);

err_out:
      return ret;
}

static void __exit dec_lance_remove(struct device *bdev)
{
      struct net_device *dev = dev_get_drvdata(bdev);
      resource_size_t start, len;

      unregister_netdev(dev);
      start = to_tc_dev(bdev)->resource.start;
      len = to_tc_dev(bdev)->resource.end - start + 1;
      release_mem_region(start, len);
      free_netdev(dev);
}

/* Find all the lance cards on the system and initialize them */
static int __init dec_lance_platform_probe(void)
{
      int count = 0;

      if (dec_interrupt[DEC_IRQ_LANCE] >= 0) {
            if (dec_interrupt[DEC_IRQ_LANCE_MERR] >= 0) {
                  if (dec_lance_probe(NULL, ASIC_LANCE) >= 0)
                        count++;
            } else if (!TURBOCHANNEL) {
                  if (dec_lance_probe(NULL, PMAX_LANCE) >= 0)
                        count++;
            }
      }

      return (count > 0) ? 0 : -ENODEV;
}

static void __exit dec_lance_platform_remove(void)
{
      while (root_lance_dev) {
            struct net_device *dev = root_lance_dev;
            struct lance_private *lp = netdev_priv(dev);

            unregister_netdev(dev);
            root_lance_dev = lp->next;
            free_netdev(dev);
      }
}

#ifdef CONFIG_TC
static int __init dec_lance_tc_probe(struct device *dev);
static int __exit dec_lance_tc_remove(struct device *dev);

static const struct tc_device_id dec_lance_tc_table[] = {
      { "DEC     ", "PMAD-AA " },
      { }
};
MODULE_DEVICE_TABLE(tc, dec_lance_tc_table);

static struct tc_driver dec_lance_tc_driver = {
      .id_table   = dec_lance_tc_table,
      .driver           = {
            .name = "declance",
            .bus  = &tc_bus_type,
            .probe      = dec_lance_tc_probe,
            .remove     = __exit_p(dec_lance_tc_remove),
      },
};

static int __init dec_lance_tc_probe(struct device *dev)
{
        int status = dec_lance_probe(dev, PMAD_LANCE);
        if (!status)
                get_device(dev);
        return status;
}

static int __exit dec_lance_tc_remove(struct device *dev)
{
        put_device(dev);
        dec_lance_remove(dev);
        return 0;
}
#endif

static int __init dec_lance_init(void)
{
      int status;

      status = tc_register_driver(&dec_lance_tc_driver);
      if (!status)
            dec_lance_platform_probe();
      return status;
}

static void __exit dec_lance_exit(void)
{
      dec_lance_platform_remove();
      tc_unregister_driver(&dec_lance_tc_driver);
}


module_init(dec_lance_init);
module_exit(dec_lance_exit);

Generated by  Doxygen 1.6.0   Back to index