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

fec_main.c

/*
 * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
 *
 * Copyright (c) 2003 Intracom S.A. 
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
 * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
 *
 * Released under the GPL
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>

#include <asm/8xx_immap.h>
#include <asm/pgtable.h>
#include <asm/mpc8xx.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/commproc.h>

#include "fec_8xx.h"

/*************************************************/

#define FEC_MAX_MULTICAST_ADDRS     64

/*************************************************/

static char version[] __devinitdata =
    DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";

MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
MODULE_DESCRIPTION("Motorola 8xx FEC ethernet driver");
MODULE_LICENSE("GPL");

int fec_8xx_debug = -1;       /* -1 == use FEC_8XX_DEF_MSG_ENABLE as value */
module_param(fec_8xx_debug, int, 0);
MODULE_PARM_DESC(fec_8xx_debug,
             "FEC 8xx bitmapped debugging message enable value");


/*************************************************/

/*
 * Delay to wait for FEC reset command to complete (in us) 
 */
#define FEC_RESET_DELAY       50

/*****************************************************************************************/

static void fec_whack_reset(fec_t * fecp)
{
      int i;

      /*
       * Whack a reset.  We should wait for this.  
       */
      FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
      for (i = 0;
           (FR(fecp, ecntrl) & FEC_ECNTRL_RESET) != 0 && i < FEC_RESET_DELAY;
           i++)
            udelay(1);

      if (i == FEC_RESET_DELAY)
            printk(KERN_WARNING "FEC Reset timeout!\n");

}

/****************************************************************************/

/*
 * Transmitter timeout.  
 */
#define TX_TIMEOUT (2*HZ)

/****************************************************************************/

/*
 * Returns the CRC needed when filling in the hash table for
 * multicast group filtering
 * pAddr must point to a MAC address (6 bytes)
 */
static __u32 fec_mulicast_calc_crc(char *pAddr)
{
      u8 byte;
      int byte_count;
      int bit_count;
      __u32 crc = 0xffffffff;
      u8 msb;

      for (byte_count = 0; byte_count < 6; byte_count++) {
            byte = pAddr[byte_count];
            for (bit_count = 0; bit_count < 8; bit_count++) {
                  msb = crc >> 31;
                  crc <<= 1;
                  if (msb ^ (byte & 0x1)) {
                        crc ^= FEC_CRC_POLY;
                  }
                  byte >>= 1;
            }
      }
      return (crc);
}

/*
 * Set or clear the multicast filter for this adaptor.
 * Skeleton taken from sunlance driver.
 * The CPM Ethernet implementation allows Multicast as well as individual
 * MAC address filtering.  Some of the drivers check to make sure it is
 * a group multicast address, and discard those that are not.  I guess I
 * will do the same for now, but just remove the test if you want
 * individual filtering as well (do the upper net layers want or support
 * this kind of feature?).
 */
static void fec_set_multicast_list(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      fec_t *fecp = fep->fecp;
      struct dev_mc_list *pmc;
      __u32 crc;
      int temp;
      __u32 csrVal;
      int hash_index;
      __u32 hthi, htlo;
      unsigned long flags;


      if ((dev->flags & IFF_PROMISC) != 0) {

            spin_lock_irqsave(&fep->lock, flags);
            FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
            spin_unlock_irqrestore(&fep->lock, flags);

            /*
             * Log any net taps. 
             */
            printk(KERN_WARNING DRV_MODULE_NAME
                   ": %s: Promiscuous mode enabled.\n", dev->name);
            return;

      }

      if ((dev->flags & IFF_ALLMULTI) != 0 ||
          dev->mc_count > FEC_MAX_MULTICAST_ADDRS) {
            /*
             * Catch all multicast addresses, set the filter to all 1's.
             */
            hthi = 0xffffffffU;
            htlo = 0xffffffffU;
      } else {
            hthi = 0;
            htlo = 0;

            /*
             * Now populate the hash table 
             */
            for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next) {
                  crc = fec_mulicast_calc_crc(pmc->dmi_addr);
                  temp = (crc & 0x3f) >> 1;
                  hash_index = ((temp & 0x01) << 4) |
                             ((temp & 0x02) << 2) |
                             ((temp & 0x04)) |
                             ((temp & 0x08) >> 2) |
                             ((temp & 0x10) >> 4);
                  csrVal = (1 << hash_index);
                  if (crc & 1)
                        hthi |= csrVal;
                  else
                        htlo |= csrVal;
            }
      }

      spin_lock_irqsave(&fep->lock, flags);
      FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
      FW(fecp, hash_table_high, hthi);
      FW(fecp, hash_table_low, htlo);
      spin_unlock_irqrestore(&fep->lock, flags);
}

static int fec_set_mac_address(struct net_device *dev, void *addr)
{
      struct sockaddr *mac = addr;
      struct fec_enet_private *fep = netdev_priv(dev);
      struct fec *fecp = fep->fecp;
      int i;
      __u32 addrhi, addrlo;
      unsigned long flags;

      /* Get pointer to SCC area in parameter RAM. */
      for (i = 0; i < 6; i++)
            dev->dev_addr[i] = mac->sa_data[i];

      /*
       * Set station address. 
       */
      addrhi = ((__u32) dev->dev_addr[0] << 24) |
             ((__u32) dev->dev_addr[1] << 16) |
             ((__u32) dev->dev_addr[2] <<  8) |
              (__u32) dev->dev_addr[3];
      addrlo = ((__u32) dev->dev_addr[4] << 24) |
             ((__u32) dev->dev_addr[5] << 16);

      spin_lock_irqsave(&fep->lock, flags);
      FW(fecp, addr_low, addrhi);
      FW(fecp, addr_high, addrlo);
      spin_unlock_irqrestore(&fep->lock, flags);

      return 0;
}

/*
 * This function is called to start or restart the FEC during a link
 * change.  This only happens when switching between half and full
 * duplex.
 */
void fec_restart(struct net_device *dev, int duplex, int speed)
{
#ifdef CONFIG_DUET
      immap_t *immap = (immap_t *) IMAP_ADDR;
      __u32 cptr;
#endif
      struct fec_enet_private *fep = netdev_priv(dev);
      struct fec *fecp = fep->fecp;
      const struct fec_platform_info *fpi = fep->fpi;
      cbd_t *bdp;
      struct sk_buff *skb;
      int i;
      __u32 addrhi, addrlo;

      fec_whack_reset(fep->fecp);

      /*
       * Set station address. 
       */
      addrhi = ((__u32) dev->dev_addr[0] << 24) |
             ((__u32) dev->dev_addr[1] << 16) |
             ((__u32) dev->dev_addr[2] <<  8) |
             (__u32) dev->dev_addr[3];
      addrlo = ((__u32) dev->dev_addr[4] << 24) |
             ((__u32) dev->dev_addr[5] << 16);
      FW(fecp, addr_low, addrhi);
      FW(fecp, addr_high, addrlo);

      /*
       * Reset all multicast. 
       */
      FW(fecp, hash_table_high, 0);
      FW(fecp, hash_table_low, 0);

      /*
       * Set maximum receive buffer size. 
       */
      FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
      FW(fecp, r_hash, PKT_MAXBUF_SIZE);

      /*
       * Set receive and transmit descriptor base. 
       */
      FW(fecp, r_des_start, iopa((__u32) (fep->rx_bd_base)));
      FW(fecp, x_des_start, iopa((__u32) (fep->tx_bd_base)));

      fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
      fep->tx_free = fep->tx_ring;
      fep->cur_rx = fep->rx_bd_base;

      /*
       * Reset SKB receive buffers 
       */
      for (i = 0; i < fep->rx_ring; i++) {
            if ((skb = fep->rx_skbuff[i]) == NULL)
                  continue;
            fep->rx_skbuff[i] = NULL;
            dev_kfree_skb(skb);
      }

      /*
       * Initialize the receive buffer descriptors. 
       */
      for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
            skb = dev_alloc_skb(ENET_RX_FRSIZE);
            if (skb == NULL) {
                  printk(KERN_WARNING DRV_MODULE_NAME
                         ": %s Memory squeeze, unable to allocate skb\n",
                         dev->name);
                  fep->stats.rx_dropped++;
                  break;
            }
            fep->rx_skbuff[i] = skb;
            skb->dev = dev;
            CBDW_BUFADDR(bdp, dma_map_single(NULL, skb->data,
                               L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
                               DMA_FROM_DEVICE));
            CBDW_DATLEN(bdp, 0);    /* zero */
            CBDW_SC(bdp, BD_ENET_RX_EMPTY |
                  ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
      }
      /*
       * if we failed, fillup remainder 
       */
      for (; i < fep->rx_ring; i++, bdp++) {
            fep->rx_skbuff[i] = NULL;
            CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
      }

      /*
       * Reset SKB transmit buffers.  
       */
      for (i = 0; i < fep->tx_ring; i++) {
            if ((skb = fep->tx_skbuff[i]) == NULL)
                  continue;
            fep->tx_skbuff[i] = NULL;
            dev_kfree_skb(skb);
      }

      /*
       * ...and the same for transmit.  
       */
      for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
            fep->tx_skbuff[i] = NULL;
            CBDW_BUFADDR(bdp, virt_to_bus(NULL));
            CBDW_DATLEN(bdp, 0);
            CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
      }

      /*
       * Enable big endian and don't care about SDMA FC. 
       */
      FW(fecp, fun_code, 0x78000000);

      /*
       * Set MII speed. 
       */
      FW(fecp, mii_speed, fep->fec_phy_speed);

      /*
       * Clear any outstanding interrupt. 
       */
      FW(fecp, ievent, 0xffc0);
      FW(fecp, ivec, (fpi->fec_irq / 2) << 29);

      /*
       * adjust to speed (only for DUET & RMII) 
       */
#ifdef CONFIG_DUET
      cptr = in_be32(&immap->im_cpm.cp_cptr);
      switch (fpi->fec_no) {
      case 0:
            /*
             * check if in RMII mode 
             */
            if ((cptr & 0x100) == 0)
                  break;

            if (speed == 10)
                  cptr |= 0x0000010;
            else if (speed == 100)
                  cptr &= ~0x0000010;
            break;
      case 1:
            /*
             * check if in RMII mode 
             */
            if ((cptr & 0x80) == 0)
                  break;

            if (speed == 10)
                  cptr |= 0x0000008;
            else if (speed == 100)
                  cptr &= ~0x0000008;
            break;
      default:
            break;
      }
      out_be32(&immap->im_cpm.cp_cptr, cptr);
#endif

      FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);   /* MII enable */
      /*
       * adjust to duplex mode 
       */
      if (duplex) {
            FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
            FS(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD enable */
      } else {
            FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
            FC(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD disable */
      }

      /*
       * Enable interrupts we wish to service. 
       */
      FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
         FEC_ENET_RXF | FEC_ENET_RXB);

      /*
       * And last, enable the transmit and receive processing. 
       */
      FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
      FW(fecp, r_des_active, 0x01000000);
}

void fec_stop(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      fec_t *fecp = fep->fecp;
      struct sk_buff *skb;
      int i;

      if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
            return;           /* already down */

      FW(fecp, x_cntrl, 0x01);      /* Graceful transmit stop */
      for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
           i < FEC_RESET_DELAY; i++)
            udelay(1);

      if (i == FEC_RESET_DELAY)
            printk(KERN_WARNING DRV_MODULE_NAME
                   ": %s FEC timeout on graceful transmit stop\n",
                   dev->name);
      /*
       * Disable FEC. Let only MII interrupts. 
       */
      FW(fecp, imask, 0);
      FW(fecp, ecntrl, ~FEC_ECNTRL_ETHER_EN);

      /*
       * Reset SKB transmit buffers.  
       */
      for (i = 0; i < fep->tx_ring; i++) {
            if ((skb = fep->tx_skbuff[i]) == NULL)
                  continue;
            fep->tx_skbuff[i] = NULL;
            dev_kfree_skb(skb);
      }

      /*
       * Reset SKB receive buffers 
       */
      for (i = 0; i < fep->rx_ring; i++) {
            if ((skb = fep->rx_skbuff[i]) == NULL)
                  continue;
            fep->rx_skbuff[i] = NULL;
            dev_kfree_skb(skb);
      }
}

/* common receive function */
static int fec_enet_rx_common(struct fec_enet_private *ep,
                        struct net_device *dev, int budget)
{
      fec_t *fecp = fep->fecp;
      const struct fec_platform_info *fpi = fep->fpi;
      cbd_t *bdp;
      struct sk_buff *skb, *skbn, *skbt;
      int received = 0;
      __u16 pkt_len, sc;
      int curidx;

      /*
       * First, grab all of the stats for the incoming packet.
       * These get messed up if we get called due to a busy condition.
       */
      bdp = fep->cur_rx;

      /* clear RX status bits for napi*/
      if (fpi->use_napi)
            FW(fecp, ievent, FEC_ENET_RXF | FEC_ENET_RXB);

      while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {

            curidx = bdp - fep->rx_bd_base;

            /*
             * Since we have allocated space to hold a complete frame,
             * the last indicator should be set.
             */
            if ((sc & BD_ENET_RX_LAST) == 0)
                  printk(KERN_WARNING DRV_MODULE_NAME
                         ": %s rcv is not +last\n",
                         dev->name);

            /*
             * Check for errors. 
             */
            if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
                    BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
                  fep->stats.rx_errors++;
                  /* Frame too long or too short. */
                  if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
                        fep->stats.rx_length_errors++;
                  /* Frame alignment */
                  if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
                        fep->stats.rx_frame_errors++;
                  /* CRC Error */
                  if (sc & BD_ENET_RX_CR)
                        fep->stats.rx_crc_errors++;
                  /* FIFO overrun */
                  if (sc & BD_ENET_RX_OV)
                        fep->stats.rx_crc_errors++;

                  skbn = fep->rx_skbuff[curidx];
                  BUG_ON(skbn == NULL);

            } else {
                  skb = fep->rx_skbuff[curidx];
                  BUG_ON(skb == NULL);

                  /*
                   * Process the incoming frame.
                   */
                  fep->stats.rx_packets++;
                  pkt_len = CBDR_DATLEN(bdp) - 4;     /* remove CRC */
                  fep->stats.rx_bytes += pkt_len + 4;

                  if (pkt_len <= fpi->rx_copybreak) {
                        /* +2 to make IP header L1 cache aligned */
                        skbn = dev_alloc_skb(pkt_len + 2);
                        if (skbn != NULL) {
                              skb_reserve(skbn, 2);   /* align IP header */
                              skb_copy_from_linear_data(skb,
                                                  skbn->data,
                                                  pkt_len);
                              /* swap */
                              skbt = skb;
                              skb = skbn;
                              skbn = skbt;
                        }
                  } else
                        skbn = dev_alloc_skb(ENET_RX_FRSIZE);

                  if (skbn != NULL) {
                        skb_put(skb, pkt_len);  /* Make room */
                        skb->protocol = eth_type_trans(skb, dev);
                        received++;
                        if (!fpi->use_napi)
                              netif_rx(skb);
                        else
                              netif_receive_skb(skb);
                  } else {
                        printk(KERN_WARNING DRV_MODULE_NAME
                               ": %s Memory squeeze, dropping packet.\n",
                               dev->name);
                        fep->stats.rx_dropped++;
                        skbn = skb;
                  }
            }

            fep->rx_skbuff[curidx] = skbn;
            CBDW_BUFADDR(bdp, dma_map_single(NULL, skbn->data,
                                     L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
                                     DMA_FROM_DEVICE));
            CBDW_DATLEN(bdp, 0);
            CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);

            /*
             * Update BD pointer to next entry. 
             */
            if ((sc & BD_ENET_RX_WRAP) == 0)
                  bdp++;
            else
                  bdp = fep->rx_bd_base;

            /*
             * Doing this here will keep the FEC running while we process
             * incoming frames.  On a heavily loaded network, we should be
             * able to keep up at the expense of system resources.
             */
            FW(fecp, r_des_active, 0x01000000);

            if (received >= budget)
                  break;

      }

      fep->cur_rx = bdp;

      if (fpi->use_napi) {
            if (received < budget) {
                  netif_rx_complete(dev, &fep->napi);

                  /* enable RX interrupt bits */
                  FS(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
            }
      }

      return received;
}

static void fec_enet_tx(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      cbd_t *bdp;
      struct sk_buff *skb;
      int dirtyidx, do_wake;
      __u16 sc;

      spin_lock(&fep->lock);
      bdp = fep->dirty_tx;

      do_wake = 0;
      while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {

            dirtyidx = bdp - fep->tx_bd_base;

            if (fep->tx_free == fep->tx_ring)
                  break;

            skb = fep->tx_skbuff[dirtyidx];

            /*
             * Check for errors. 
             */
            if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
                    BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
                  fep->stats.tx_errors++;
                  if (sc & BD_ENET_TX_HB) /* No heartbeat */
                        fep->stats.tx_heartbeat_errors++;
                  if (sc & BD_ENET_TX_LC) /* Late collision */
                        fep->stats.tx_window_errors++;
                  if (sc & BD_ENET_TX_RL) /* Retrans limit */
                        fep->stats.tx_aborted_errors++;
                  if (sc & BD_ENET_TX_UN) /* Underrun */
                        fep->stats.tx_fifo_errors++;
                  if (sc & BD_ENET_TX_CSL)      /* Carrier lost */
                        fep->stats.tx_carrier_errors++;
            } else
                  fep->stats.tx_packets++;

            if (sc & BD_ENET_TX_READY)
                  printk(KERN_WARNING DRV_MODULE_NAME
                         ": %s HEY! Enet xmit interrupt and TX_READY.\n",
                         dev->name);

            /*
             * Deferred means some collisions occurred during transmit,
             * but we eventually sent the packet OK.
             */
            if (sc & BD_ENET_TX_DEF)
                  fep->stats.collisions++;

            /*
             * Free the sk buffer associated with this last transmit. 
             */
            dev_kfree_skb_irq(skb);
            fep->tx_skbuff[dirtyidx] = NULL;

            /*
             * Update pointer to next buffer descriptor to be transmitted. 
             */
            if ((sc & BD_ENET_TX_WRAP) == 0)
                  bdp++;
            else
                  bdp = fep->tx_bd_base;

            /*
             * Since we have freed up a buffer, the ring is no longer
             * full.
             */
            if (!fep->tx_free++)
                  do_wake = 1;
      }

      fep->dirty_tx = bdp;

      spin_unlock(&fep->lock);

      if (do_wake && netif_queue_stopped(dev))
            netif_wake_queue(dev);
}

/*
 * The interrupt handler.
 * This is called from the MPC core interrupt.
 */
static irqreturn_t
fec_enet_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct fec_enet_private *fep;
      const struct fec_platform_info *fpi;
      fec_t *fecp;
      __u32 int_events;
      __u32 int_events_napi;

      if (unlikely(dev == NULL))
            return IRQ_NONE;

      fep = netdev_priv(dev);
      fecp = fep->fecp;
      fpi = fep->fpi;

      /*
       * Get the interrupt events that caused us to be here.
       */
      while ((int_events = FR(fecp, ievent) & FR(fecp, imask)) != 0) {

            if (!fpi->use_napi)
                  FW(fecp, ievent, int_events);
            else {
                  int_events_napi = int_events & ~(FEC_ENET_RXF | FEC_ENET_RXB);
                  FW(fecp, ievent, int_events_napi);
            }

            if ((int_events & (FEC_ENET_HBERR | FEC_ENET_BABR |
                           FEC_ENET_BABT | FEC_ENET_EBERR)) != 0)
                  printk(KERN_WARNING DRV_MODULE_NAME
                         ": %s FEC ERROR(s) 0x%x\n",
                         dev->name, int_events);

            if ((int_events & FEC_ENET_RXF) != 0) {
                  if (!fpi->use_napi)
                        fec_enet_rx_common(fep, dev, ~0);
                  else {
                        if (netif_rx_schedule_prep(dev, &fep->napi)) {
                              /* disable rx interrupts */
                              FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
                              __netif_rx_schedule(dev, &fep->napi);
                        } else {
                              printk(KERN_ERR DRV_MODULE_NAME
                                     ": %s driver bug! interrupt while in poll!\n",
                                     dev->name);
                              FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
                        }
                  }
            }

            if ((int_events & FEC_ENET_TXF) != 0)
                  fec_enet_tx(dev);
      }

      return IRQ_HANDLED;
}

/* This interrupt occurs when the PHY detects a link change. */
static irqreturn_t
fec_mii_link_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct fec_enet_private *fep;
      const struct fec_platform_info *fpi;

      if (unlikely(dev == NULL))
            return IRQ_NONE;

      fep = netdev_priv(dev);
      fpi = fep->fpi;

      if (!fpi->use_mdio)
            return IRQ_NONE;

      /*
       * Acknowledge the interrupt if possible. If we have not
       * found the PHY yet we can't process or acknowledge the
       * interrupt now. Instead we ignore this interrupt for now,
       * which we can do since it is edge triggered. It will be
       * acknowledged later by fec_enet_open().
       */
      if (!fep->phy)
            return IRQ_NONE;

      fec_mii_ack_int(dev);
      fec_mii_link_status_change_check(dev, 0);

      return IRQ_HANDLED;
}


/**********************************************************************************/

static int fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      fec_t *fecp = fep->fecp;
      cbd_t *bdp;
      int curidx;
      unsigned long flags;

      spin_lock_irqsave(&fep->tx_lock, flags);

      /*
       * Fill in a Tx ring entry 
       */
      bdp = fep->cur_tx;

      if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
            netif_stop_queue(dev);
            spin_unlock_irqrestore(&fep->tx_lock, flags);

            /*
             * Ooops.  All transmit buffers are full.  Bail out.
             * This should not happen, since the tx queue should be stopped.
             */
            printk(KERN_WARNING DRV_MODULE_NAME
                   ": %s tx queue full!.\n", dev->name);
            return 1;
      }

      curidx = bdp - fep->tx_bd_base;
      /*
       * Clear all of the status flags. 
       */
      CBDC_SC(bdp, BD_ENET_TX_STATS);

      /*
       * Save skb pointer. 
       */
      fep->tx_skbuff[curidx] = skb;

      fep->stats.tx_bytes += skb->len;

      /*
       * Push the data cache so the CPM does not get stale memory data. 
       */
      CBDW_BUFADDR(bdp, dma_map_single(NULL, skb->data,
                               skb->len, DMA_TO_DEVICE));
      CBDW_DATLEN(bdp, skb->len);

      dev->trans_start = jiffies;

      /*
       * If this was the last BD in the ring, start at the beginning again. 
       */
      if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
            fep->cur_tx++;
      else
            fep->cur_tx = fep->tx_bd_base;

      if (!--fep->tx_free)
            netif_stop_queue(dev);

      /*
       * Trigger transmission start 
       */
      CBDS_SC(bdp, BD_ENET_TX_READY | BD_ENET_TX_INTR |
            BD_ENET_TX_LAST | BD_ENET_TX_TC);
      FW(fecp, x_des_active, 0x01000000);

      spin_unlock_irqrestore(&fep->tx_lock, flags);

      return 0;
}

static void fec_timeout(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);

      fep->stats.tx_errors++;

      if (fep->tx_free)
            netif_wake_queue(dev);

      /* check link status again */
      fec_mii_link_status_change_check(dev, 0);
}

static int fec_enet_open(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      const struct fec_platform_info *fpi = fep->fpi;
      unsigned long flags;

      napi_enable(&fep->napi);

      /* Install our interrupt handler. */
      if (request_irq(fpi->fec_irq, fec_enet_interrupt, 0, "fec", dev) != 0) {
            printk(KERN_ERR DRV_MODULE_NAME
                   ": %s Could not allocate FEC IRQ!", dev->name);
            napi_disable(&fep->napi);
            return -EINVAL;
      }

      /* Install our phy interrupt handler */
      if (fpi->phy_irq != -1 && 
            request_irq(fpi->phy_irq, fec_mii_link_interrupt, 0, "fec-phy",
                        dev) != 0) {
            printk(KERN_ERR DRV_MODULE_NAME
                   ": %s Could not allocate PHY IRQ!", dev->name);
            free_irq(fpi->fec_irq, dev);
            napi_disable(&fep->napi);
            return -EINVAL;
      }

      if (fpi->use_mdio) {
            fec_mii_startup(dev);
            netif_carrier_off(dev);
            fec_mii_link_status_change_check(dev, 1);
      } else {
            spin_lock_irqsave(&fep->lock, flags);
            fec_restart(dev, 1, 100);     /* XXX this sucks */
            spin_unlock_irqrestore(&fep->lock, flags);

            netif_carrier_on(dev);
            netif_start_queue(dev);
      }
      return 0;
}

static int fec_enet_close(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      const struct fec_platform_info *fpi = fep->fpi;
      unsigned long flags;

      netif_stop_queue(dev);
      napi_disable(&fep->napi);
      netif_carrier_off(dev);

      if (fpi->use_mdio)
            fec_mii_shutdown(dev);

      spin_lock_irqsave(&fep->lock, flags);
      fec_stop(dev);
      spin_unlock_irqrestore(&fep->lock, flags);

      /* release any irqs */
      if (fpi->phy_irq != -1)
            free_irq(fpi->phy_irq, dev);
      free_irq(fpi->fec_irq, dev);

      return 0;
}

static struct net_device_stats *fec_enet_get_stats(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      return &fep->stats;
}

static int fec_enet_poll(struct napi_struct *napi, int budget)
{
      struct fec_enet_private *fep = container_of(napi, struct fec_enet_private, napi);
      struct net_device *dev = fep->dev;

      return fec_enet_rx_common(fep, dev, budget);
}

/*************************************************************************/

static void fec_get_drvinfo(struct net_device *dev,
                      struct ethtool_drvinfo *info)
{
      strcpy(info->driver, DRV_MODULE_NAME);
      strcpy(info->version, DRV_MODULE_VERSION);
}

static int fec_get_regs_len(struct net_device *dev)
{
      return sizeof(fec_t);
}

static void fec_get_regs(struct net_device *dev, struct ethtool_regs *regs,
                   void *p)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      unsigned long flags;

      if (regs->len < sizeof(fec_t))
            return;

      regs->version = 0;
      spin_lock_irqsave(&fep->lock, flags);
      memcpy_fromio(p, fep->fecp, sizeof(fec_t));
      spin_unlock_irqrestore(&fep->lock, flags);
}

static int fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      unsigned long flags;
      int rc;

      spin_lock_irqsave(&fep->lock, flags);
      rc = mii_ethtool_gset(&fep->mii_if, cmd);
      spin_unlock_irqrestore(&fep->lock, flags);

      return rc;
}

static int fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      unsigned long flags;
      int rc;

      spin_lock_irqsave(&fep->lock, flags);
      rc = mii_ethtool_sset(&fep->mii_if, cmd);
      spin_unlock_irqrestore(&fep->lock, flags);

      return rc;
}

static int fec_nway_reset(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      return mii_nway_restart(&fep->mii_if);
}

static __u32 fec_get_msglevel(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      return fep->msg_enable;
}

static void fec_set_msglevel(struct net_device *dev, __u32 value)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      fep->msg_enable = value;
}

static const struct ethtool_ops fec_ethtool_ops = {
      .get_drvinfo      = fec_get_drvinfo,
      .get_regs_len     = fec_get_regs_len,
      .get_settings     = fec_get_settings,
      .set_settings     = fec_set_settings,
      .nway_reset = fec_nway_reset,
      .get_link   = ethtool_op_get_link,
      .get_msglevel     = fec_get_msglevel,
      .set_msglevel     = fec_set_msglevel,
      .set_tx_csum      = ethtool_op_set_tx_csum,     /* local! */
      .set_sg           = ethtool_op_set_sg,
      .get_regs   = fec_get_regs,
};

static int fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
      unsigned long flags;
      int rc;

      if (!netif_running(dev))
            return -EINVAL;

      spin_lock_irqsave(&fep->lock, flags);
      rc = generic_mii_ioctl(&fep->mii_if, mii, cmd, NULL);
      spin_unlock_irqrestore(&fep->lock, flags);
      return rc;
}

int fec_8xx_init_one(const struct fec_platform_info *fpi,
                 struct net_device **devp)
{
      immap_t *immap = (immap_t *) IMAP_ADDR;
      static int fec_8xx_version_printed = 0;
      struct net_device *dev = NULL;
      struct fec_enet_private *fep = NULL;
      fec_t *fecp = NULL;
      int i;
      int err = 0;
      int registered = 0;
      __u32 siel;

      *devp = NULL;

      switch (fpi->fec_no) {
      case 0:
            fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
            break;
#ifdef CONFIG_DUET
      case 1:
            fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec2;
            break;
#endif
      default:
            return -EINVAL;
      }

      if (fec_8xx_version_printed++ == 0)
            printk(KERN_INFO "%s", version);

      i = sizeof(*fep) + (sizeof(struct sk_buff **) *
                      (fpi->rx_ring + fpi->tx_ring));

      dev = alloc_etherdev(i);
      if (!dev) {
            err = -ENOMEM;
            goto err;
      }

      fep = netdev_priv(dev);
      fep->dev = dev;

      /* partial reset of FEC */
      fec_whack_reset(fecp);

      /* point rx_skbuff, tx_skbuff */
      fep->rx_skbuff = (struct sk_buff **)&fep[1];
      fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;

      fep->fecp = fecp;
      fep->fpi = fpi;

      /* init locks */
      spin_lock_init(&fep->lock);
      spin_lock_init(&fep->tx_lock);

      /*
       * Set the Ethernet address. 
       */
      for (i = 0; i < 6; i++)
            dev->dev_addr[i] = fpi->macaddr[i];

      fep->ring_base = dma_alloc_coherent(NULL,
                                  (fpi->tx_ring + fpi->rx_ring) *
                                  sizeof(cbd_t), &fep->ring_mem_addr,
                                  GFP_KERNEL);
      if (fep->ring_base == NULL) {
            printk(KERN_ERR DRV_MODULE_NAME
                   ": %s dma alloc failed.\n", dev->name);
            err = -ENOMEM;
            goto err;
      }

      /*
       * Set receive and transmit descriptor base.
       */
      fep->rx_bd_base = fep->ring_base;
      fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;

      /* initialize ring size variables */
      fep->tx_ring = fpi->tx_ring;
      fep->rx_ring = fpi->rx_ring;

      /* SIU interrupt */
      if (fpi->phy_irq != -1 &&
            (fpi->phy_irq >= SIU_IRQ0 && fpi->phy_irq < SIU_LEVEL7)) {

            siel = in_be32(&immap->im_siu_conf.sc_siel);
            if ((fpi->phy_irq & 1) == 0)
                  siel |= (0x80000000 >> fpi->phy_irq);
            else
                  siel &= ~(0x80000000 >> (fpi->phy_irq & ~1));
            out_be32(&immap->im_siu_conf.sc_siel, siel);
      }

      /*
       * The FEC Ethernet specific entries in the device structure. 
       */
      dev->open = fec_enet_open;
      dev->hard_start_xmit = fec_enet_start_xmit;
      dev->tx_timeout = fec_timeout;
      dev->watchdog_timeo = TX_TIMEOUT;
      dev->stop = fec_enet_close;
      dev->get_stats = fec_enet_get_stats;
      dev->set_multicast_list = fec_set_multicast_list;
      dev->set_mac_address = fec_set_mac_address;
      netif_napi_add(dev, &fec->napi,
                   fec_enet_poll, fpi->napi_weight);

      dev->ethtool_ops = &fec_ethtool_ops;
      dev->do_ioctl = fec_ioctl;

      fep->fec_phy_speed =
          ((((fpi->sys_clk + 4999999) / 2500000) / 2) & 0x3F) << 1;

      init_timer(&fep->phy_timer_list);

      /* partial reset of FEC so that only MII works */
      FW(fecp, mii_speed, fep->fec_phy_speed);
      FW(fecp, ievent, 0xffc0);
      FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
      FW(fecp, imask, 0);
      FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);   /* MII enable */
      FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);

      netif_carrier_off(dev);

      err = register_netdev(dev);
      if (err != 0)
            goto err;
      registered = 1;

      if (fpi->use_mdio) {
            fep->mii_if.dev = dev;
            fep->mii_if.mdio_read = fec_mii_read;
            fep->mii_if.mdio_write = fec_mii_write;
            fep->mii_if.phy_id_mask = 0x1f;
            fep->mii_if.reg_num_mask = 0x1f;
            fep->mii_if.phy_id = fec_mii_phy_id_detect(dev);
      }

      *devp = dev;

      return 0;

      err:
      if (dev != NULL) {
            if (fecp != NULL)
                  fec_whack_reset(fecp);

            if (registered)
                  unregister_netdev(dev);

            if (fep != NULL) {
                  if (fep->ring_base)
                        dma_free_coherent(NULL,
                                      (fpi->tx_ring +
                                       fpi->rx_ring) *
                                      sizeof(cbd_t), fep->ring_base,
                                      fep->ring_mem_addr);
            }
            free_netdev(dev);
      }
      return err;
}

int fec_8xx_cleanup_one(struct net_device *dev)
{
      struct fec_enet_private *fep = netdev_priv(dev);
      fec_t *fecp = fep->fecp;
      const struct fec_platform_info *fpi = fep->fpi;

      fec_whack_reset(fecp);

      unregister_netdev(dev);

      dma_free_coherent(NULL, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
                    fep->ring_base, fep->ring_mem_addr);

      free_netdev(dev);

      return 0;
}

/**************************************************************************************/
/**************************************************************************************/
/**************************************************************************************/

static int __init fec_8xx_init(void)
{
      return fec_8xx_platform_init();
}

static void __exit fec_8xx_cleanup(void)
{
      fec_8xx_platform_cleanup();
}

/**************************************************************************************/
/**************************************************************************************/
/**************************************************************************************/

module_init(fec_8xx_init);
module_exit(fec_8xx_cleanup);

Generated by  Doxygen 1.6.0   Back to index