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fec_mpc52xx.c

/*
 * Driver for the MPC5200 Fast Ethernet Controller
 *
 * Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and
 * now maintained by Sylvain Munaut <tnt@246tNt.com>
 *
 * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
 * Copyright (C) 2007  Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2003-2004  MontaVista, Software, Inc.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 */

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/hardirq.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>

#include <asm/io.h>
#include <asm/delay.h>
#include <asm/mpc52xx.h>

#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/fec.h>

#include "fec_mpc52xx.h"

#define DRIVER_NAME "mpc52xx-fec"

static irqreturn_t mpc52xx_fec_interrupt(int, void *);
static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
static void mpc52xx_fec_stop(struct net_device *dev);
static void mpc52xx_fec_start(struct net_device *dev);
static void mpc52xx_fec_reset(struct net_device *dev);

static u8 mpc52xx_fec_mac_addr[6];
module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");

#define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
            NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFDOWN )
static int debug = -1;  /* the above default */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "debugging messages level");

static void mpc52xx_fec_tx_timeout(struct net_device *dev)
{
      dev_warn(&dev->dev, "transmit timed out\n");

      mpc52xx_fec_reset(dev);

      dev->stats.tx_errors++;

      netif_wake_queue(dev);
}

static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;

      out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
      out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
}

static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;

      *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
      *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
}

static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
{
      struct sockaddr *sock = addr;

      memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);

      mpc52xx_fec_set_paddr(dev, sock->sa_data);
      return 0;
}

static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
{
      while (!bcom_queue_empty(s)) {
            struct bcom_fec_bd *bd;
            struct sk_buff *skb;

            skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
            dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
            kfree_skb(skb);
      }
}

static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
{
      while (!bcom_queue_full(rxtsk)) {
            struct sk_buff *skb;
            struct bcom_fec_bd *bd;

            skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
            if (skb == NULL)
                  return -EAGAIN;

            /* zero out the initial receive buffers to aid debugging */
            memset(skb->data, 0, FEC_RX_BUFFER_SIZE);

            bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);

            bd->status = FEC_RX_BUFFER_SIZE;
            bd->skb_pa = dma_map_single(&dev->dev, skb->data,
                        FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);

            bcom_submit_next_buffer(rxtsk, skb);
      }

      return 0;
}

/* based on generic_adjust_link from fs_enet-main.c */
static void mpc52xx_fec_adjust_link(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct phy_device *phydev = priv->phydev;
      int new_state = 0;

      if (phydev->link != PHY_DOWN) {
            if (phydev->duplex != priv->duplex) {
                  struct mpc52xx_fec __iomem *fec = priv->fec;
                  u32 rcntrl;
                  u32 tcntrl;

                  new_state = 1;
                  priv->duplex = phydev->duplex;

                  rcntrl = in_be32(&fec->r_cntrl);
                  tcntrl = in_be32(&fec->x_cntrl);

                  rcntrl &= ~FEC_RCNTRL_DRT;
                  tcntrl &= ~FEC_TCNTRL_FDEN;
                  if (phydev->duplex == DUPLEX_FULL)
                        tcntrl |= FEC_TCNTRL_FDEN;    /* FD enable */
                  else
                        rcntrl |= FEC_RCNTRL_DRT;     /* disable Rx on Tx (HD) */

                  out_be32(&fec->r_cntrl, rcntrl);
                  out_be32(&fec->x_cntrl, tcntrl);
            }

            if (phydev->speed != priv->speed) {
                  new_state = 1;
                  priv->speed = phydev->speed;
            }

            if (priv->link == PHY_DOWN) {
                  new_state = 1;
                  priv->link = phydev->link;
                  netif_schedule(dev);
                  netif_carrier_on(dev);
                  netif_start_queue(dev);
            }

      } else if (priv->link) {
            new_state = 1;
            priv->link = PHY_DOWN;
            priv->speed = 0;
            priv->duplex = -1;
            netif_stop_queue(dev);
            netif_carrier_off(dev);
      }

      if (new_state && netif_msg_link(priv))
            phy_print_status(phydev);
}

static int mpc52xx_fec_init_phy(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct phy_device *phydev;
      char phy_id[BUS_ID_SIZE];

      snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT,
                  (unsigned int)dev->base_addr, priv->phy_addr);

      priv->link = PHY_DOWN;
      priv->speed = 0;
      priv->duplex = -1;

      phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
      if (IS_ERR(phydev)) {
            dev_err(&dev->dev, "phy_connect failed\n");
            return PTR_ERR(phydev);
      }
      dev_info(&dev->dev, "attached phy %i to driver %s\n",
                  phydev->addr, phydev->drv->name);

      priv->phydev = phydev;

      return 0;
}

static int mpc52xx_fec_phy_start(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      int err;

      if (!priv->has_phy)
            return 0;

      err = mpc52xx_fec_init_phy(dev);
      if (err) {
            dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
            return err;
      }

      /* reset phy - this also wakes it from PDOWN */
      phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
      phy_start(priv->phydev);

      return 0;
}

static void mpc52xx_fec_phy_stop(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);

      if (!priv->has_phy)
            return;

      phy_disconnect(priv->phydev);
      /* power down phy */
      phy_stop(priv->phydev);
      phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
}

static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
            struct mii_ioctl_data *mii_data, int cmd)
{
      if (!priv->has_phy)
            return -ENOTSUPP;

      return phy_mii_ioctl(priv->phydev, mii_data, cmd);
}

static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
{
      struct mpc52xx_fec __iomem *fec = priv->fec;

      if (!priv->has_phy)
            return;

      out_be32(&fec->mii_speed, priv->phy_speed);
}

static int mpc52xx_fec_open(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      int err = -EBUSY;

      if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
                      DRIVER_NAME "_ctrl", dev)) {
            dev_err(&dev->dev, "ctrl interrupt request failed\n");
            goto out;
      }
      if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
                      DRIVER_NAME "_rx", dev)) {
            dev_err(&dev->dev, "rx interrupt request failed\n");
            goto free_ctrl_irq;
      }
      if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
                      DRIVER_NAME "_tx", dev)) {
            dev_err(&dev->dev, "tx interrupt request failed\n");
            goto free_2irqs;
      }

      bcom_fec_rx_reset(priv->rx_dmatsk);
      bcom_fec_tx_reset(priv->tx_dmatsk);

      err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
      if (err) {
            dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
            goto free_irqs;
      }

      err = mpc52xx_fec_phy_start(dev);
      if (err)
            goto free_skbs;

      bcom_enable(priv->rx_dmatsk);
      bcom_enable(priv->tx_dmatsk);

      mpc52xx_fec_start(dev);

      netif_start_queue(dev);

      return 0;

 free_skbs:
      mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);

 free_irqs:
      free_irq(priv->t_irq, dev);
 free_2irqs:
      free_irq(priv->r_irq, dev);
 free_ctrl_irq:
      free_irq(dev->irq, dev);
 out:

      return err;
}

static int mpc52xx_fec_close(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);

      netif_stop_queue(dev);

      mpc52xx_fec_stop(dev);

      mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);

      free_irq(dev->irq, dev);
      free_irq(priv->r_irq, dev);
      free_irq(priv->t_irq, dev);

      mpc52xx_fec_phy_stop(dev);

      return 0;
}

/* This will only be invoked if your driver is _not_ in XOFF state.
 * What this means is that you need not check it, and that this
 * invariant will hold if you make sure that the netif_*_queue()
 * calls are done at the proper times.
 */
static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct bcom_fec_bd *bd;

      if (bcom_queue_full(priv->tx_dmatsk)) {
            if (net_ratelimit())
                  dev_err(&dev->dev, "transmit queue overrun\n");
            return 1;
      }

      spin_lock_irq(&priv->lock);
      dev->trans_start = jiffies;

      bd = (struct bcom_fec_bd *)
            bcom_prepare_next_buffer(priv->tx_dmatsk);

      bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
      bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);

      bcom_submit_next_buffer(priv->tx_dmatsk, skb);

      if (bcom_queue_full(priv->tx_dmatsk)) {
            netif_stop_queue(dev);
      }

      spin_unlock_irq(&priv->lock);

      return 0;
}

/* This handles BestComm transmit task interrupts
 */
static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);

      spin_lock(&priv->lock);

      while (bcom_buffer_done(priv->tx_dmatsk)) {
            struct sk_buff *skb;
            struct bcom_fec_bd *bd;
            skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
                        (struct bcom_bd **)&bd);
            dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);

            dev_kfree_skb_irq(skb);
      }

      netif_wake_queue(dev);

      spin_unlock(&priv->lock);

      return IRQ_HANDLED;
}

static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);

      while (bcom_buffer_done(priv->rx_dmatsk)) {
            struct sk_buff *skb;
            struct sk_buff *rskb;
            struct bcom_fec_bd *bd;
            u32 status;

            rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
                        (struct bcom_bd **)&bd);
            dma_unmap_single(&dev->dev, bd->skb_pa, rskb->len, DMA_FROM_DEVICE);

            /* Test for errors in received frame */
            if (status & BCOM_FEC_RX_BD_ERRORS) {
                  /* Drop packet and reuse the buffer */
                  bd = (struct bcom_fec_bd *)
                        bcom_prepare_next_buffer(priv->rx_dmatsk);

                  bd->status = FEC_RX_BUFFER_SIZE;
                  bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
                              FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);

                  bcom_submit_next_buffer(priv->rx_dmatsk, rskb);

                  dev->stats.rx_dropped++;

                  continue;
            }

            /* skbs are allocated on open, so now we allocate a new one,
             * and remove the old (with the packet) */
            skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
            if (skb) {
                  /* Process the received skb */
                  int length = status & BCOM_FEC_RX_BD_LEN_MASK;

                  skb_put(rskb, length - 4);    /* length without CRC32 */

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

                  netif_rx(rskb);
                  dev->last_rx = jiffies;
            } else {
                  /* Can't get a new one : reuse the same & drop pkt */
                  dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
                  dev->stats.rx_dropped++;

                  skb = rskb;
            }

            bd = (struct bcom_fec_bd *)
                  bcom_prepare_next_buffer(priv->rx_dmatsk);

            bd->status = FEC_RX_BUFFER_SIZE;
            bd->skb_pa = dma_map_single(&dev->dev, skb->data,
                        FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);

            bcom_submit_next_buffer(priv->rx_dmatsk, skb);
      }

      return IRQ_HANDLED;
}

static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;
      u32 ievent;

      ievent = in_be32(&fec->ievent);

      ievent &= ~FEC_IEVENT_MII;    /* mii is handled separately */
      if (!ievent)
            return IRQ_NONE;

      out_be32(&fec->ievent, ievent);           /* clear pending events */

      if (ievent & ~(FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
            if (ievent & ~FEC_IEVENT_TFINT)
                  dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
            return IRQ_HANDLED;
      }

      if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
            dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
      if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
            dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");

      mpc52xx_fec_reset(dev);

      netif_wake_queue(dev);
      return IRQ_HANDLED;
}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct net_device_stats *stats = &dev->stats;
      struct mpc52xx_fec __iomem *fec = priv->fec;

      stats->rx_bytes = in_be32(&fec->rmon_r_octets);
      stats->rx_packets = in_be32(&fec->rmon_r_packets);
      stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
            in_be32(&fec->rmon_r_undersize) +
            in_be32(&fec->rmon_r_oversize) +
            in_be32(&fec->rmon_r_frag) +
            in_be32(&fec->rmon_r_jab);

      stats->tx_bytes = in_be32(&fec->rmon_t_octets);
      stats->tx_packets = in_be32(&fec->rmon_t_packets);
      stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
            in_be32(&fec->rmon_t_undersize) +
            in_be32(&fec->rmon_t_oversize) +
            in_be32(&fec->rmon_t_frag) +
            in_be32(&fec->rmon_t_jab);

      stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
      stats->collisions = in_be32(&fec->rmon_t_col);

      /* detailed rx_errors: */
      stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
                              + in_be32(&fec->rmon_r_oversize)
                              + in_be32(&fec->rmon_r_frag)
                              + in_be32(&fec->rmon_r_jab);
      stats->rx_over_errors = in_be32(&fec->r_macerr);
      stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
      stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
      stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
      stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);

      /* detailed tx_errors: */
      stats->tx_aborted_errors = 0;
      stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
      stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
      stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
      stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);

      return stats;
}

/*
 * Read MIB counters in order to reset them,
 * then zero all the stats fields in memory
 */
static void mpc52xx_fec_reset_stats(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;

      out_be32(&fec->mib_control, FEC_MIB_DISABLE);
      memset_io(&fec->rmon_t_drop, 0,
               offsetof(struct mpc52xx_fec, reserved10) -
               offsetof(struct mpc52xx_fec, rmon_t_drop));
      out_be32(&fec->mib_control, 0);

      memset(&dev->stats, 0, sizeof(dev->stats));
}

/*
 * Set or clear the multicast filter for this adaptor.
 */
static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;
      u32 rx_control;

      rx_control = in_be32(&fec->r_cntrl);

      if (dev->flags & IFF_PROMISC) {
            rx_control |= FEC_RCNTRL_PROM;
            out_be32(&fec->r_cntrl, rx_control);
      } else {
            rx_control &= ~FEC_RCNTRL_PROM;
            out_be32(&fec->r_cntrl, rx_control);

            if (dev->flags & IFF_ALLMULTI) {
                  out_be32(&fec->gaddr1, 0xffffffff);
                  out_be32(&fec->gaddr2, 0xffffffff);
            } else {
                  u32 crc;
                  int i;
                  struct dev_mc_list *dmi;
                  u32 gaddr1 = 0x00000000;
                  u32 gaddr2 = 0x00000000;

                  dmi = dev->mc_list;
                  for (i=0; i<dev->mc_count; i++) {
                        crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
                        if (crc >= 32)
                              gaddr1 |= 1 << (crc-32);
                        else
                              gaddr2 |= 1 << crc;
                        dmi = dmi->next;
                  }
                  out_be32(&fec->gaddr1, gaddr1);
                  out_be32(&fec->gaddr2, gaddr2);
            }
      }
}

/**
 * mpc52xx_fec_hw_init
 * @dev: network device
 *
 * Setup various hardware setting, only needed once on start
 */
static void mpc52xx_fec_hw_init(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;
      int i;

      /* Whack a reset.  We should wait for this. */
      out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
      for (i = 0; i < FEC_RESET_DELAY; ++i) {
            if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
                  break;
            udelay(1);
      }
      if (i == FEC_RESET_DELAY)
            dev_err(&dev->dev, "FEC Reset timeout!\n");

      /* set pause to 0x20 frames */
      out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);

      /* high service request will be deasserted when there's < 7 bytes in fifo
       * low service request will be deasserted when there's < 4*7 bytes in fifo
       */
      out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
      out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);

      /* alarm when <= x bytes in FIFO */
      out_be32(&fec->rfifo_alarm, 0x0000030c);
      out_be32(&fec->tfifo_alarm, 0x00000100);

      /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
      out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);

      /* enable crc generation */
      out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
      out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
      out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */

      /* set phy speed.
       * this can't be done in phy driver, since it needs to be called
       * before fec stuff (even on resume) */
      mpc52xx_fec_phy_hw_init(priv);
}

/**
 * mpc52xx_fec_start
 * @dev: network device
 *
 * This function is called to start or restart the FEC during a link
 * change.  This happens on fifo errors or when switching between half
 * and full duplex.
 */
static void mpc52xx_fec_start(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;
      u32 rcntrl;
      u32 tcntrl;
      u32 tmp;

      /* clear sticky error bits */
      tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
      out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
      out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);

      /* FIFOs will reset on mpc52xx_fec_enable */
      out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);

      /* Set station address. */
      mpc52xx_fec_set_paddr(dev, dev->dev_addr);

      mpc52xx_fec_set_multicast_list(dev);

      /* set max frame len, enable flow control, select mii mode */
      rcntrl = FEC_RX_BUFFER_SIZE << 16;  /* max frame length */
      rcntrl |= FEC_RCNTRL_FCE;

      if (priv->has_phy)
            rcntrl |= FEC_RCNTRL_MII_MODE;

      if (priv->duplex == DUPLEX_FULL)
            tcntrl = FEC_TCNTRL_FDEN;     /* FD enable */
      else {
            rcntrl |= FEC_RCNTRL_DRT;     /* disable Rx on Tx (HD) */
            tcntrl = 0;
      }
      out_be32(&fec->r_cntrl, rcntrl);
      out_be32(&fec->x_cntrl, tcntrl);

      /* Clear any outstanding interrupt. */
      out_be32(&fec->ievent, 0xffffffff);

      /* Enable interrupts we wish to service. */
      out_be32(&fec->imask, FEC_IMASK_ENABLE);

      /* And last, enable the transmit and receive processing. */
      out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
      out_be32(&fec->r_des_active, 0x01000000);
}

/**
 * mpc52xx_fec_stop
 * @dev: network device
 *
 * stop all activity on fec and empty dma buffers
 */
static void mpc52xx_fec_stop(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;
      unsigned long timeout;

      /* disable all interrupts */
      out_be32(&fec->imask, 0);

      /* Disable the rx task. */
      bcom_disable(priv->rx_dmatsk);

      /* Wait for tx queue to drain, but only if we're in process context */
      if (!in_interrupt()) {
            timeout = jiffies + msecs_to_jiffies(2000);
            while (time_before(jiffies, timeout) &&
                        !bcom_queue_empty(priv->tx_dmatsk))
                  msleep(100);

            if (time_after_eq(jiffies, timeout))
                  dev_err(&dev->dev, "queues didn't drain\n");
#if 1
            if (time_after_eq(jiffies, timeout)) {
                  dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
                              priv->tx_dmatsk->index,
                              priv->tx_dmatsk->outdex);
                  dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
                              priv->rx_dmatsk->index,
                              priv->rx_dmatsk->outdex);
            }
#endif
      }

      bcom_disable(priv->tx_dmatsk);

      /* Stop FEC */
      out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);

      return;
}

/* reset fec and bestcomm tasks */
static void mpc52xx_fec_reset(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      struct mpc52xx_fec __iomem *fec = priv->fec;

      mpc52xx_fec_stop(dev);

      out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
      out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);

      mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);

      mpc52xx_fec_hw_init(dev);

      phy_stop(priv->phydev);
      phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
      phy_start(priv->phydev);

      bcom_fec_rx_reset(priv->rx_dmatsk);
      bcom_fec_tx_reset(priv->tx_dmatsk);

      mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);

      bcom_enable(priv->rx_dmatsk);
      bcom_enable(priv->tx_dmatsk);

      mpc52xx_fec_start(dev);
}


/* ethtool interface */
static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
            struct ethtool_drvinfo *info)
{
      strcpy(info->driver, DRIVER_NAME);
}

static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      return phy_ethtool_gset(priv->phydev, cmd);
}

static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      return phy_ethtool_sset(priv->phydev, cmd);
}

static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      return priv->msg_enable;
}

static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);
      priv->msg_enable = level;
}

static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
      .get_drvinfo = mpc52xx_fec_get_drvinfo,
      .get_settings = mpc52xx_fec_get_settings,
      .set_settings = mpc52xx_fec_set_settings,
      .get_link = ethtool_op_get_link,
      .get_msglevel = mpc52xx_fec_get_msglevel,
      .set_msglevel = mpc52xx_fec_set_msglevel,
};


static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
      struct mpc52xx_fec_priv *priv = netdev_priv(dev);

      return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
}

/* ======================================================================== */
/* OF Driver                                                                */
/* ======================================================================== */

static int __devinit
mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
{
      int rv;
      struct net_device *ndev;
      struct mpc52xx_fec_priv *priv = NULL;
      struct resource mem;
      const phandle *ph;

      phys_addr_t rx_fifo;
      phys_addr_t tx_fifo;

      /* Get the ether ndev & it's private zone */
      ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
      if (!ndev)
            return -ENOMEM;

      priv = netdev_priv(ndev);

      /* Reserve FEC control zone */
      rv = of_address_to_resource(op->node, 0, &mem);
      if (rv) {
            printk(KERN_ERR DRIVER_NAME ": "
                        "Error while parsing device node resource\n" );
            return rv;
      }
      if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
            printk(KERN_ERR DRIVER_NAME
                  " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
                  (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
            return -EINVAL;
      }

      if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
            return -EBUSY;

      /* Init ether ndev with what we have */
      ndev->open        = mpc52xx_fec_open;
      ndev->stop        = mpc52xx_fec_close;
      ndev->hard_start_xmit   = mpc52xx_fec_hard_start_xmit;
      ndev->do_ioctl          = mpc52xx_fec_ioctl;
      ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
      ndev->get_stats         = mpc52xx_fec_get_stats;
      ndev->set_mac_address   = mpc52xx_fec_set_mac_address;
      ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
      ndev->tx_timeout  = mpc52xx_fec_tx_timeout;
      ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
      ndev->base_addr         = mem.start;

      priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */

      spin_lock_init(&priv->lock);

      /* ioremap the zones */
      priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));

      if (!priv->fec) {
            rv = -ENOMEM;
            goto probe_error;
      }

      /* Bestcomm init */
      rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
      tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);

      priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
      priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);

      if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
            printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
            rv = -ENOMEM;
            goto probe_error;
      }

      /* Get the IRQ we need one by one */
            /* Control */
      ndev->irq = irq_of_parse_and_map(op->node, 0);

            /* RX */
      priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);

            /* TX */
      priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);

      /* MAC address init */
      if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
            memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
      else
            mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);

      priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
      priv->duplex = DUPLEX_FULL;

      /* is the phy present in device tree? */
      ph = of_get_property(op->node, "phy-handle", NULL);
      if (ph) {
            const unsigned int *prop;
            struct device_node *phy_dn;
            priv->has_phy = 1;

            phy_dn = of_find_node_by_phandle(*ph);
            prop = of_get_property(phy_dn, "reg", NULL);
            priv->phy_addr = *prop;

            of_node_put(phy_dn);

            /* Phy speed */
            priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
      } else {
            dev_info(&ndev->dev, "can't find \"phy-handle\" in device"
                        " tree, using 7-wire mode\n");
      }

      /* Hardware init */
      mpc52xx_fec_hw_init(ndev);

      mpc52xx_fec_reset_stats(ndev);

      SET_NETDEV_DEV(ndev, &op->dev);

      /* Register the new network device */
      rv = register_netdev(ndev);
      if (rv < 0)
            goto probe_error;

      /* We're done ! */
      dev_set_drvdata(&op->dev, ndev);

      return 0;


      /* Error handling - free everything that might be allocated */
probe_error:

      irq_dispose_mapping(ndev->irq);

      if (priv->rx_dmatsk)
            bcom_fec_rx_release(priv->rx_dmatsk);
      if (priv->tx_dmatsk)
            bcom_fec_tx_release(priv->tx_dmatsk);

      if (priv->fec)
            iounmap(priv->fec);

      release_mem_region(mem.start, sizeof(struct mpc52xx_fec));

      free_netdev(ndev);

      return rv;
}

static int
mpc52xx_fec_remove(struct of_device *op)
{
      struct net_device *ndev;
      struct mpc52xx_fec_priv *priv;

      ndev = dev_get_drvdata(&op->dev);
      priv = netdev_priv(ndev);

      unregister_netdev(ndev);

      irq_dispose_mapping(ndev->irq);

      bcom_fec_rx_release(priv->rx_dmatsk);
      bcom_fec_tx_release(priv->tx_dmatsk);

      iounmap(priv->fec);

      release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));

      free_netdev(ndev);

      dev_set_drvdata(&op->dev, NULL);
      return 0;
}

#ifdef CONFIG_PM
static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
{
      struct net_device *dev = dev_get_drvdata(&op->dev);

      if (netif_running(dev))
            mpc52xx_fec_close(dev);

      return 0;
}

static int mpc52xx_fec_of_resume(struct of_device *op)
{
      struct net_device *dev = dev_get_drvdata(&op->dev);

      mpc52xx_fec_hw_init(dev);
      mpc52xx_fec_reset_stats(dev);

      if (netif_running(dev))
            mpc52xx_fec_open(dev);

      return 0;
}
#endif

static struct of_device_id mpc52xx_fec_match[] = {
      {
            .type       = "network",
            .compatible = "mpc5200-fec",
      },
      { }
};

MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);

static struct of_platform_driver mpc52xx_fec_driver = {
      .owner            = THIS_MODULE,
      .name       = DRIVER_NAME,
      .match_table      = mpc52xx_fec_match,
      .probe            = mpc52xx_fec_probe,
      .remove           = mpc52xx_fec_remove,
#ifdef CONFIG_PM
      .suspend    = mpc52xx_fec_of_suspend,
      .resume           = mpc52xx_fec_of_resume,
#endif
};


/* ======================================================================== */
/* Module                                                                   */
/* ======================================================================== */

static int __init
mpc52xx_fec_init(void)
{
#ifdef CONFIG_FEC_MPC52xx_MDIO
      int ret;
      ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
      if (ret) {
            printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
            return ret;
      }
#endif
      return of_register_platform_driver(&mpc52xx_fec_driver);
}

static void __exit
mpc52xx_fec_exit(void)
{
      of_unregister_platform_driver(&mpc52xx_fec_driver);
#ifdef CONFIG_FEC_MPC52xx_MDIO
      of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
#endif
}


module_init(mpc52xx_fec_init);
module_exit(mpc52xx_fec_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dale Farnsworth");
MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");

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