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bfin_mac.c

/*
 * File:    drivers/net/bfin_mac.c
 * Based on:
 * Maintainer:
 *          Bryan Wu <bryan.wu@analog.com>
 *
 * Original author:
 *          Luke Yang <luke.yang@analog.com>
 *
 * Created:
 * Description:
 *
 * Modified:
 *          Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:    Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software ;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation ;  either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY ;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program ;  see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>

#include <asm/dma.h>
#include <linux/dma-mapping.h>

#include <asm/blackfin.h>
#include <asm/cacheflush.h>
#include <asm/portmux.h>

#include "bfin_mac.h"

#define DRV_NAME  "bfin_mac"
#define DRV_VERSION     "1.1"
#define DRV_AUTHOR      "Bryan Wu, Luke Yang"
#define DRV_DESC  "Blackfin BF53[67] on-chip Ethernet MAC driver"

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRV_DESC);

#if defined(CONFIG_BFIN_MAC_USE_L1)
# define bfin_mac_alloc(dma_handle, size)  l1_data_sram_zalloc(size)
# define bfin_mac_free(dma_handle, ptr)    l1_data_sram_free(ptr)
#else
# define bfin_mac_alloc(dma_handle, size) \
      dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
# define bfin_mac_free(dma_handle, ptr) \
      dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
#endif

#define PKT_BUF_SZ 1580

#define MAX_TIMEOUT_CNT 500

/* pointers to maintain transmit list */
static struct net_dma_desc_tx *tx_list_head;
static struct net_dma_desc_tx *tx_list_tail;
static struct net_dma_desc_rx *rx_list_head;
static struct net_dma_desc_rx *rx_list_tail;
static struct net_dma_desc_rx *current_rx_ptr;
static struct net_dma_desc_tx *current_tx_ptr;
static struct net_dma_desc_tx *tx_desc;
static struct net_dma_desc_rx *rx_desc;

static void bf537mac_disable(void);
static void bf537mac_enable(void);

static void desc_list_free(void)
{
      struct net_dma_desc_rx *r;
      struct net_dma_desc_tx *t;
      int i;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
      dma_addr_t dma_handle = 0;
#endif

      if (tx_desc) {
            t = tx_list_head;
            for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
                  if (t) {
                        if (t->skb) {
                              dev_kfree_skb(t->skb);
                              t->skb = NULL;
                        }
                        t = t->next;
                  }
            }
            bfin_mac_free(dma_handle, tx_desc);
      }

      if (rx_desc) {
            r = rx_list_head;
            for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
                  if (r) {
                        if (r->skb) {
                              dev_kfree_skb(r->skb);
                              r->skb = NULL;
                        }
                        r = r->next;
                  }
            }
            bfin_mac_free(dma_handle, rx_desc);
      }
}

static int desc_list_init(void)
{
      int i;
      struct sk_buff *new_skb;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
      /*
       * This dma_handle is useless in Blackfin dma_alloc_coherent().
       * The real dma handler is the return value of dma_alloc_coherent().
       */
      dma_addr_t dma_handle;
#endif

      tx_desc = bfin_mac_alloc(&dma_handle,
                        sizeof(struct net_dma_desc_tx) *
                        CONFIG_BFIN_TX_DESC_NUM);
      if (tx_desc == NULL)
            goto init_error;

      rx_desc = bfin_mac_alloc(&dma_handle,
                        sizeof(struct net_dma_desc_rx) *
                        CONFIG_BFIN_RX_DESC_NUM);
      if (rx_desc == NULL)
            goto init_error;

      /* init tx_list */
      tx_list_head = tx_list_tail = tx_desc;

      for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
            struct net_dma_desc_tx *t = tx_desc + i;
            struct dma_descriptor *a = &(t->desc_a);
            struct dma_descriptor *b = &(t->desc_b);

            /*
             * disable DMA
             * read from memory WNR = 0
             * wordsize is 32 bits
             * 6 half words is desc size
             * large desc flow
             */
            a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
            a->start_addr = (unsigned long)t->packet;
            a->x_count = 0;
            a->next_dma_desc = b;

            /*
             * enabled DMA
             * write to memory WNR = 1
             * wordsize is 32 bits
             * disable interrupt
             * 6 half words is desc size
             * large desc flow
             */
            b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
            b->start_addr = (unsigned long)(&(t->status));
            b->x_count = 0;

            t->skb = NULL;
            tx_list_tail->desc_b.next_dma_desc = a;
            tx_list_tail->next = t;
            tx_list_tail = t;
      }
      tx_list_tail->next = tx_list_head;  /* tx_list is a circle */
      tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
      current_tx_ptr = tx_list_head;

      /* init rx_list */
      rx_list_head = rx_list_tail = rx_desc;

      for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
            struct net_dma_desc_rx *r = rx_desc + i;
            struct dma_descriptor *a = &(r->desc_a);
            struct dma_descriptor *b = &(r->desc_b);

            /* allocate a new skb for next time receive */
            new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
            if (!new_skb) {
                  printk(KERN_NOTICE DRV_NAME
                         ": init: low on mem - packet dropped\n");
                  goto init_error;
            }
            skb_reserve(new_skb, 2);
            r->skb = new_skb;

            /*
             * enabled DMA
             * write to memory WNR = 1
             * wordsize is 32 bits
             * disable interrupt
             * 6 half words is desc size
             * large desc flow
             */
            a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
            /* since RXDWA is enabled */
            a->start_addr = (unsigned long)new_skb->data - 2;
            a->x_count = 0;
            a->next_dma_desc = b;

            /*
             * enabled DMA
             * write to memory WNR = 1
             * wordsize is 32 bits
             * enable interrupt
             * 6 half words is desc size
             * large desc flow
             */
            b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
                        NDSIZE_6 | DMAFLOW_LARGE;
            b->start_addr = (unsigned long)(&(r->status));
            b->x_count = 0;

            rx_list_tail->desc_b.next_dma_desc = a;
            rx_list_tail->next = r;
            rx_list_tail = r;
      }
      rx_list_tail->next = rx_list_head;  /* rx_list is a circle */
      rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
      current_rx_ptr = rx_list_head;

      return 0;

init_error:
      desc_list_free();
      printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
      return -ENOMEM;
}


/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/

/* Set FER regs to MUX in Ethernet pins */
static int setup_pin_mux(int action)
{
#if defined(CONFIG_BFIN_MAC_RMII)
      u16 pin_req[] = P_RMII0;
#else
      u16 pin_req[] = P_MII0;
#endif

      if (action) {
            if (peripheral_request_list(pin_req, DRV_NAME)) {
                  printk(KERN_ERR DRV_NAME
                  ": Requesting Peripherals failed\n");
                  return -EFAULT;
            }
      } else
            peripheral_free_list(pin_req);

      return 0;
}

/*
 * MII operations
 */
/* Wait until the previous MDC/MDIO transaction has completed */
static void mdio_poll(void)
{
      int timeout_cnt = MAX_TIMEOUT_CNT;

      /* poll the STABUSY bit */
      while ((bfin_read_EMAC_STAADD()) & STABUSY) {
            mdelay(10);
            if (timeout_cnt-- < 0) {
                  printk(KERN_ERR DRV_NAME
                  ": wait MDC/MDIO transaction to complete timeout\n");
                  break;
            }
      }
}

/* Read an off-chip register in a PHY through the MDC/MDIO port */
static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
{
      mdio_poll();

      /* read mode */
      bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
                        SET_REGAD((u16) regnum) |
                        STABUSY);

      mdio_poll();

      return (int) bfin_read_EMAC_STADAT();
}

/* Write an off-chip register in a PHY through the MDC/MDIO port */
static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
                   u16 value)
{
      mdio_poll();

      bfin_write_EMAC_STADAT((u32) value);

      /* write mode */
      bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
                        SET_REGAD((u16) regnum) |
                        STAOP |
                        STABUSY);

      mdio_poll();

      return 0;
}

static int mdiobus_reset(struct mii_bus *bus)
{
      return 0;
}

static void bf537_adjust_link(struct net_device *dev)
{
      struct bf537mac_local *lp = netdev_priv(dev);
      struct phy_device *phydev = lp->phydev;
      unsigned long flags;
      int new_state = 0;

      spin_lock_irqsave(&lp->lock, flags);
      if (phydev->link) {
            /* Now we make sure that we can be in full duplex mode.
             * If not, we operate in half-duplex mode. */
            if (phydev->duplex != lp->old_duplex) {
                  u32 opmode = bfin_read_EMAC_OPMODE();
                  new_state = 1;

                  if (phydev->duplex)
                        opmode |= FDMODE;
                  else
                        opmode &= ~(FDMODE);

                  bfin_write_EMAC_OPMODE(opmode);
                  lp->old_duplex = phydev->duplex;
            }

            if (phydev->speed != lp->old_speed) {
#if defined(CONFIG_BFIN_MAC_RMII)
                  u32 opmode = bfin_read_EMAC_OPMODE();
                  switch (phydev->speed) {
                  case 10:
                        opmode |= RMII_10;
                        break;
                  case 100:
                        opmode &= ~(RMII_10);
                        break;
                  default:
                        printk(KERN_WARNING
                              "%s: Ack!  Speed (%d) is not 10/100!\n",
                              DRV_NAME, phydev->speed);
                        break;
                  }
                  bfin_write_EMAC_OPMODE(opmode);
#endif

                  new_state = 1;
                  lp->old_speed = phydev->speed;
            }

            if (!lp->old_link) {
                  new_state = 1;
                  lp->old_link = 1;
                  netif_schedule(dev);
            }
      } else if (lp->old_link) {
            new_state = 1;
            lp->old_link = 0;
            lp->old_speed = 0;
            lp->old_duplex = -1;
      }

      if (new_state) {
            u32 opmode = bfin_read_EMAC_OPMODE();
            phy_print_status(phydev);
            pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
      }

      spin_unlock_irqrestore(&lp->lock, flags);
}

static int mii_probe(struct net_device *dev)
{
      struct bf537mac_local *lp = netdev_priv(dev);
      struct phy_device *phydev = NULL;
      unsigned short sysctl;
      int i;

      /* Enable PHY output early */
      if (!(bfin_read_VR_CTL() & PHYCLKOE))
            bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);

      /* MDC  = 2.5 MHz */
      sysctl = bfin_read_EMAC_SYSCTL();
      sysctl |= SET_MDCDIV(24);
      bfin_write_EMAC_SYSCTL(sysctl);

      /* search for connect PHY device */
      for (i = 0; i < PHY_MAX_ADDR; i++) {
            struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];

            if (!tmp_phydev)
                  continue; /* no PHY here... */

            phydev = tmp_phydev;
            break; /* found it */
      }

      /* now we are supposed to have a proper phydev, to attach to... */
      if (!phydev) {
            printk(KERN_INFO "%s: Don't found any phy device at all\n",
                  dev->name);
            return -ENODEV;
      }

#if defined(CONFIG_BFIN_MAC_RMII)
      phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
                  PHY_INTERFACE_MODE_RMII);
#else
      phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
                  PHY_INTERFACE_MODE_MII);
#endif

      if (IS_ERR(phydev)) {
            printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
            return PTR_ERR(phydev);
      }

      /* mask with MAC supported features */
      phydev->supported &= (SUPPORTED_10baseT_Half
                        | SUPPORTED_10baseT_Full
                        | SUPPORTED_100baseT_Half
                        | SUPPORTED_100baseT_Full
                        | SUPPORTED_Autoneg
                        | SUPPORTED_Pause | SUPPORTED_Asym_Pause
                        | SUPPORTED_MII
                        | SUPPORTED_TP);

      phydev->advertising = phydev->supported;

      lp->old_link = 0;
      lp->old_speed = 0;
      lp->old_duplex = -1;
      lp->phydev = phydev;

      printk(KERN_INFO "%s: attached PHY driver [%s] "
             "(mii_bus:phy_addr=%s, irq=%d)\n",
             DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq);

      return 0;
}

/**************************************************************************/
void setup_system_regs(struct net_device *dev)
{
      unsigned short sysctl;

      /*
       * Odd word alignment for Receive Frame DMA word
       * Configure checksum support and rcve frame word alignment
       */
      sysctl = bfin_read_EMAC_SYSCTL();
#if defined(BFIN_MAC_CSUM_OFFLOAD)
      sysctl |= RXDWA | RXCKS;
#else
      sysctl |= RXDWA;
#endif
      bfin_write_EMAC_SYSCTL(sysctl);

      bfin_write_EMAC_MMC_CTL(RSTC | CROLL);

      /* Initialize the TX DMA channel registers */
      bfin_write_DMA2_X_COUNT(0);
      bfin_write_DMA2_X_MODIFY(4);
      bfin_write_DMA2_Y_COUNT(0);
      bfin_write_DMA2_Y_MODIFY(0);

      /* Initialize the RX DMA channel registers */
      bfin_write_DMA1_X_COUNT(0);
      bfin_write_DMA1_X_MODIFY(4);
      bfin_write_DMA1_Y_COUNT(0);
      bfin_write_DMA1_Y_MODIFY(0);
}

static void setup_mac_addr(u8 *mac_addr)
{
      u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
      u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);

      /* this depends on a little-endian machine */
      bfin_write_EMAC_ADDRLO(addr_low);
      bfin_write_EMAC_ADDRHI(addr_hi);
}

static int bf537mac_set_mac_address(struct net_device *dev, void *p)
{
      struct sockaddr *addr = p;
      if (netif_running(dev))
            return -EBUSY;
      memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
      setup_mac_addr(dev->dev_addr);
      return 0;
}

static void adjust_tx_list(void)
{
      int timeout_cnt = MAX_TIMEOUT_CNT;

      if (tx_list_head->status.status_word != 0
          && current_tx_ptr != tx_list_head) {
            goto adjust_head; /* released something, just return; */
      }

      /*
       * if nothing released, check wait condition
       * current's next can not be the head,
       * otherwise the dma will not stop as we want
       */
      if (current_tx_ptr->next->next == tx_list_head) {
            while (tx_list_head->status.status_word == 0) {
                  mdelay(10);
                  if (tx_list_head->status.status_word != 0
                      || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
                        goto adjust_head;
                  }
                  if (timeout_cnt-- < 0) {
                        printk(KERN_ERR DRV_NAME
                        ": wait for adjust tx list head timeout\n");
                        break;
                  }
            }
            if (tx_list_head->status.status_word != 0) {
                  goto adjust_head;
            }
      }

      return;

adjust_head:
      do {
            tx_list_head->desc_a.config &= ~DMAEN;
            tx_list_head->status.status_word = 0;
            if (tx_list_head->skb) {
                  dev_kfree_skb(tx_list_head->skb);
                  tx_list_head->skb = NULL;
            } else {
                  printk(KERN_ERR DRV_NAME
                         ": no sk_buff in a transmitted frame!\n");
            }
            tx_list_head = tx_list_head->next;
      } while (tx_list_head->status.status_word != 0
             && current_tx_ptr != tx_list_head);
      return;

}

static int bf537mac_hard_start_xmit(struct sk_buff *skb,
                        struct net_device *dev)
{
      struct bf537mac_local *lp = netdev_priv(dev);
      unsigned int data;

      current_tx_ptr->skb = skb;

      /*
       * Is skb->data always 16-bit aligned?
       * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
       */
      if ((((unsigned int)(skb->data)) & 0x02) == 2) {
            /* move skb->data to current_tx_ptr payload */
            data = (unsigned int)(skb->data) - 2;
            *((unsigned short *)data) = (unsigned short)(skb->len);
            current_tx_ptr->desc_a.start_addr = (unsigned long)data;
            /* this is important! */
            blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);

      } else {
            *((unsigned short *)(current_tx_ptr->packet)) =
                (unsigned short)(skb->len);
            memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
                   (skb->len));
            current_tx_ptr->desc_a.start_addr =
                (unsigned long)current_tx_ptr->packet;
            if (current_tx_ptr->status.status_word != 0)
                  current_tx_ptr->status.status_word = 0;
            blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
                                  packet,
                                  (unsigned int)(current_tx_ptr->
                                             packet + skb->len) +
                                  2);
      }

      /* enable this packet's dma */
      current_tx_ptr->desc_a.config |= DMAEN;

      /* tx dma is running, just return */
      if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
            goto out;

      /* tx dma is not running */
      bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
      /* dma enabled, read from memory, size is 6 */
      bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
      /* Turn on the EMAC tx */
      bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);

out:
      adjust_tx_list();
      current_tx_ptr = current_tx_ptr->next;
      dev->trans_start = jiffies;
      dev->stats.tx_packets++;
      dev->stats.tx_bytes += (skb->len);
      return 0;
}

static void bf537mac_rx(struct net_device *dev)
{
      struct sk_buff *skb, *new_skb;
      struct bf537mac_local *lp = netdev_priv(dev);
      unsigned short len;

      /* allocate a new skb for next time receive */
      skb = current_rx_ptr->skb;
      new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
      if (!new_skb) {
            printk(KERN_NOTICE DRV_NAME
                   ": rx: low on mem - packet dropped\n");
            dev->stats.rx_dropped++;
            goto out;
      }
      /* reserve 2 bytes for RXDWA padding */
      skb_reserve(new_skb, 2);
      current_rx_ptr->skb = new_skb;
      current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;

      len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
      skb_put(skb, len);
      blackfin_dcache_invalidate_range((unsigned long)skb->head,
                               (unsigned long)skb->tail);

      dev->last_rx = jiffies;
      skb->dev = dev;
      skb->protocol = eth_type_trans(skb, dev);
#if defined(BFIN_MAC_CSUM_OFFLOAD)
      skb->csum = current_rx_ptr->status.ip_payload_csum;
      skb->ip_summed = CHECKSUM_COMPLETE;
#endif

      netif_rx(skb);
      dev->stats.rx_packets++;
      dev->stats.rx_bytes += len;
      current_rx_ptr->status.status_word = 0x00000000;
      current_rx_ptr = current_rx_ptr->next;

out:
      return;
}

/* interrupt routine to handle rx and error signal */
static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      int number = 0;

get_one_packet:
      if (current_rx_ptr->status.status_word == 0) {
            /* no more new packet received */
            if (number == 0) {
                  if (current_rx_ptr->next->status.status_word != 0) {
                        current_rx_ptr = current_rx_ptr->next;
                        goto real_rx;
                  }
            }
            bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
                                 DMA_DONE | DMA_ERR);
            return IRQ_HANDLED;
      }

real_rx:
      bf537mac_rx(dev);
      number++;
      goto get_one_packet;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void bf537mac_poll(struct net_device *dev)
{
      disable_irq(IRQ_MAC_RX);
      bf537mac_interrupt(IRQ_MAC_RX, dev);
      enable_irq(IRQ_MAC_RX);
}
#endif                        /* CONFIG_NET_POLL_CONTROLLER */

static void bf537mac_disable(void)
{
      unsigned int opmode;

      opmode = bfin_read_EMAC_OPMODE();
      opmode &= (~RE);
      opmode &= (~TE);
      /* Turn off the EMAC */
      bfin_write_EMAC_OPMODE(opmode);
}

/*
 * Enable Interrupts, Receive, and Transmit
 */
static void bf537mac_enable(void)
{
      u32 opmode;

      pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);

      /* Set RX DMA */
      bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
      bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);

      /* Wait MII done */
      mdio_poll();

      /* We enable only RX here */
      /* ASTP   : Enable Automatic Pad Stripping
         PR     : Promiscuous Mode for test
         PSF    : Receive frames with total length less than 64 bytes.
         FDMODE : Full Duplex Mode
         LB     : Internal Loopback for test
         RE     : Receiver Enable */
      opmode = bfin_read_EMAC_OPMODE();
      if (opmode & FDMODE)
            opmode |= PSF;
      else
            opmode |= DRO | DC | PSF;
      opmode |= RE;

#if defined(CONFIG_BFIN_MAC_RMII)
      opmode |= RMII; /* For Now only 100MBit are supported */
#ifdef CONFIG_BF_REV_0_2
      opmode |= TE;
#endif
#endif
      /* Turn on the EMAC rx */
      bfin_write_EMAC_OPMODE(opmode);
}

/* Our watchdog timed out. Called by the networking layer */
static void bf537mac_timeout(struct net_device *dev)
{
      pr_debug("%s: %s\n", dev->name, __FUNCTION__);

      bf537mac_disable();

      /* reset tx queue */
      tx_list_tail = tx_list_head->next;

      bf537mac_enable();

      /* We can accept TX packets again */
      dev->trans_start = jiffies;
      netif_wake_queue(dev);
}

/*
 * This routine will, depending on the values passed to it,
 * either make it accept multicast packets, go into
 * promiscuous mode (for TCPDUMP and cousins) or accept
 * a select set of multicast packets
 */
static void bf537mac_set_multicast_list(struct net_device *dev)
{
      u32 sysctl;

      if (dev->flags & IFF_PROMISC) {
            printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
            sysctl = bfin_read_EMAC_OPMODE();
            sysctl |= RAF;
            bfin_write_EMAC_OPMODE(sysctl);
      } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
            /* accept all multicast */
            sysctl = bfin_read_EMAC_OPMODE();
            sysctl |= PAM;
            bfin_write_EMAC_OPMODE(sysctl);
      } else {
            /* clear promisc or multicast mode */
            sysctl = bfin_read_EMAC_OPMODE();
            sysctl &= ~(RAF | PAM);
            bfin_write_EMAC_OPMODE(sysctl);
      }
}

/*
 * this puts the device in an inactive state
 */
static void bf537mac_shutdown(struct net_device *dev)
{
      /* Turn off the EMAC */
      bfin_write_EMAC_OPMODE(0x00000000);
      /* Turn off the EMAC RX DMA */
      bfin_write_DMA1_CONFIG(0x0000);
      bfin_write_DMA2_CONFIG(0x0000);
}

/*
 * Open and Initialize the interface
 *
 * Set up everything, reset the card, etc..
 */
static int bf537mac_open(struct net_device *dev)
{
      struct bf537mac_local *lp = netdev_priv(dev);
      int retval;
      pr_debug("%s: %s\n", dev->name, __FUNCTION__);

      /*
       * Check that the address is valid.  If its not, refuse
       * to bring the device up.  The user must specify an
       * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
       */
      if (!is_valid_ether_addr(dev->dev_addr)) {
            printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
            return -EINVAL;
      }

      /* initial rx and tx list */
      retval = desc_list_init();

      if (retval)
            return retval;

      phy_start(lp->phydev);
      setup_system_regs(dev);
      bf537mac_disable();
      bf537mac_enable();

      pr_debug("hardware init finished\n");
      netif_start_queue(dev);
      netif_carrier_on(dev);

      return 0;
}

/*
 *
 * this makes the board clean up everything that it can
 * and not talk to the outside world.   Caused by
 * an 'ifconfig ethX down'
 */
static int bf537mac_close(struct net_device *dev)
{
      struct bf537mac_local *lp = netdev_priv(dev);
      pr_debug("%s: %s\n", dev->name, __FUNCTION__);

      netif_stop_queue(dev);
      netif_carrier_off(dev);

      phy_stop(lp->phydev);

      /* clear everything */
      bf537mac_shutdown(dev);

      /* free the rx/tx buffers */
      desc_list_free();

      return 0;
}

static int __init bf537mac_probe(struct net_device *dev)
{
      struct bf537mac_local *lp = netdev_priv(dev);
      int retval;
      int i;

      /* Grab the MAC address in the MAC */
      *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
      *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());

      /* probe mac */
      /*todo: how to proble? which is revision_register */
      bfin_write_EMAC_ADDRLO(0x12345678);
      if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
            pr_debug("can't detect bf537 mac!\n");
            retval = -ENODEV;
            goto err_out;
      }

      /* set the GPIO pins to Ethernet mode */
      retval = setup_pin_mux(1);
      if (retval)
            return retval;

      /*Is it valid? (Did bootloader initialize it?) */
      if (!is_valid_ether_addr(dev->dev_addr)) {
            /* Grab the MAC from the board somehow - this is done in the
               arch/blackfin/mach-bf537/boards/eth_mac.c */
            bfin_get_ether_addr(dev->dev_addr);
      }

      /* If still not valid, get a random one */
      if (!is_valid_ether_addr(dev->dev_addr)) {
            random_ether_addr(dev->dev_addr);
      }

      setup_mac_addr(dev->dev_addr);

      /* MDIO bus initial */
      lp->mii_bus.priv = dev;
      lp->mii_bus.read = mdiobus_read;
      lp->mii_bus.write = mdiobus_write;
      lp->mii_bus.reset = mdiobus_reset;
      lp->mii_bus.name = "bfin_mac_mdio";
      lp->mii_bus.id = 0;
      lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
      for (i = 0; i < PHY_MAX_ADDR; ++i)
            lp->mii_bus.irq[i] = PHY_POLL;

      mdiobus_register(&lp->mii_bus);

      retval = mii_probe(dev);
      if (retval)
            return retval;

      /* Fill in the fields of the device structure with ethernet values. */
      ether_setup(dev);

      dev->open = bf537mac_open;
      dev->stop = bf537mac_close;
      dev->hard_start_xmit = bf537mac_hard_start_xmit;
      dev->set_mac_address = bf537mac_set_mac_address;
      dev->tx_timeout = bf537mac_timeout;
      dev->set_multicast_list = bf537mac_set_multicast_list;
#ifdef CONFIG_NET_POLL_CONTROLLER
      dev->poll_controller = bf537mac_poll;
#endif

      spin_lock_init(&lp->lock);

      /* now, enable interrupts */
      /* register irq handler */
      if (request_irq
          (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
           "BFIN537_MAC_RX", dev)) {
            printk(KERN_WARNING DRV_NAME
                   ": Unable to attach BlackFin MAC RX interrupt\n");
            return -EBUSY;
      }


      retval = register_netdev(dev);
      if (retval == 0) {
            /* now, print out the card info, in a short format.. */
            printk(KERN_INFO "%s: Version %s, %s\n",
                   DRV_NAME, DRV_VERSION, DRV_DESC);
      }

err_out:
      return retval;
}

static int bfin_mac_probe(struct platform_device *pdev)
{
      struct net_device *ndev;

      ndev = alloc_etherdev(sizeof(struct bf537mac_local));
      if (!ndev) {
            printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
            return -ENOMEM;
      }

      SET_NETDEV_DEV(ndev, &pdev->dev);

      platform_set_drvdata(pdev, ndev);

      if (bf537mac_probe(ndev) != 0) {
            platform_set_drvdata(pdev, NULL);
            free_netdev(ndev);
            printk(KERN_WARNING DRV_NAME ": not found\n");
            return -ENODEV;
      }

      return 0;
}

static int bfin_mac_remove(struct platform_device *pdev)
{
      struct net_device *ndev = platform_get_drvdata(pdev);

      platform_set_drvdata(pdev, NULL);

      unregister_netdev(ndev);

      free_irq(IRQ_MAC_RX, ndev);

      free_netdev(ndev);

      setup_pin_mux(0);

      return 0;
}

#ifdef CONFIG_PM
static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
{
      struct net_device *net_dev = platform_get_drvdata(pdev);

      if (netif_running(net_dev))
            bf537mac_close(net_dev);

      return 0;
}

static int bfin_mac_resume(struct platform_device *pdev)
{
      struct net_device *net_dev = platform_get_drvdata(pdev);

      if (netif_running(net_dev))
            bf537mac_open(net_dev);

      return 0;
}
#else
#define bfin_mac_suspend NULL
#define bfin_mac_resume NULL
#endif      /* CONFIG_PM */

static struct platform_driver bfin_mac_driver = {
      .probe = bfin_mac_probe,
      .remove = bfin_mac_remove,
      .resume = bfin_mac_resume,
      .suspend = bfin_mac_suspend,
      .driver = {
               .name = DRV_NAME,
               },
};

static int __init bfin_mac_init(void)
{
      return platform_driver_register(&bfin_mac_driver);
}

module_init(bfin_mac_init);

static void __exit bfin_mac_cleanup(void)
{
      platform_driver_unregister(&bfin_mac_driver);
}

module_exit(bfin_mac_cleanup);

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