text: /*
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
   * Copyright (C) 2009 Cavium Networks
   */
  
  #include <linux/capability.h>
  #include <linux/dma-mapping.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/interrupt.h>
  #include <linux/platform_device.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/if.h>
  #include <linux/if_vlan.h>
  #include <linux/slab.h>
  #include <linux/phy.h>
  #include <linux/spinlock.h>
  
  #include <asm/octeon/octeon.h>
  #include <asm/octeon/cvmx-mixx-defs.h>
  #include <asm/octeon/cvmx-agl-defs.h>
  
  #define DRV_NAME "octeon_mgmt"
  #define DRV_VERSION "2.0"
  #define DRV_DESCRIPTION \
  	"Cavium Networks Octeon MII (management) port Network Driver"
  
  #define OCTEON_MGMT_NAPI_WEIGHT 16
  
  /*
   * Ring sizes that are powers of two allow for more efficient modulo
   * opertions.
   */
  #define OCTEON_MGMT_RX_RING_SIZE 512
  #define OCTEON_MGMT_TX_RING_SIZE 128
  
  /* Allow 8 bytes for vlan and FCS. */
  #define OCTEON_MGMT_RX_HEADROOM (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN)
  
  union mgmt_port_ring_entry {
  	u64 d64;
  	struct {
  		u64    reserved_62_63:2;
  		/* Length of the buffer/packet in bytes */
  		u64    len:14;
  		/* For TX, signals that the packet should be timestamped */
  		u64    tstamp:1;
  		/* The RX error code */
  		u64    code:7;
  #define RING_ENTRY_CODE_DONE 0xf
  #define RING_ENTRY_CODE_MORE 0x10
  		/* Physical address of the buffer */
  		u64    addr:40;
  	} s;
  };
  
  struct octeon_mgmt {
  	struct net_device *netdev;
  	int port;
  	int irq;
  	u64 *tx_ring;
  	dma_addr_t tx_ring_handle;
  	unsigned int tx_next;
  	unsigned int tx_next_clean;
  	unsigned int tx_current_fill;
  	/* The tx_list lock also protects the ring related variables */
  	struct sk_buff_head tx_list;
  
  	/* RX variables only touched in napi_poll.  No locking necessary. */
  	u64 *rx_ring;
  	dma_addr_t rx_ring_handle;
  	unsigned int rx_next;
  	unsigned int rx_next_fill;
  	unsigned int rx_current_fill;
  	struct sk_buff_head rx_list;
  
  	spinlock_t lock;
  	unsigned int last_duplex;
  	unsigned int last_link;
  	struct device *dev;
  	struct napi_struct napi;
  	struct tasklet_struct tx_clean_tasklet;
  	struct phy_device *phydev;
  };
  
  static void octeon_mgmt_set_rx_irq(struct octeon_mgmt *p, int enable)
  {
  	int port = p->port;
  	union cvmx_mixx_intena mix_intena;
  	unsigned long flags;
  
  	spin_lock_irqsave(&p->lock, flags);
  	mix_intena.u64 = cvmx_read_csr(CVMX_MIXX_INTENA(port));
  	mix_intena.s.ithena = enable ? 1 : 0;
  	cvmx_write_csr(CVMX_MIXX_INTENA(port), mix_intena.u64);
  	spin_unlock_irqrestore(&p->lock, flags);
  }
  
  static void octeon_mgmt_set_tx_irq(struct octeon_mgmt *p, int enable)
  {
  	int port = p->port;
  	union cvmx_mixx_intena mix_intena;
  	unsigned long flags;
  
  	spin_lock_irqsave(&p->lock, flags);
  	mix_intena.u64 = cvmx_read_csr(CVMX_MIXX_INTENA(port));
  	mix_intena.s.othena = enable ? 1 : 0;
  	cvmx_write_csr(CVMX_MIXX_INTENA(port), mix_intena.u64);
  	spin_unlock_irqrestore(&p->lock, flags);
  }
  
  static inline void octeon_mgmt_enable_rx_irq(struct octeon_mgmt *p)
  {
  	octeon_mgmt_set_rx_irq(p, 1);
  }
  
  static inline void octeon_mgmt_disable_rx_irq(struct octeon_mgmt *p)
  {
  	octeon_mgmt_set_rx_irq(p, 0);
  }
  
  static inline void octeon_mgmt_enable_tx_irq(struct octeon_mgmt *p)
  {
  	octeon_mgmt_set_tx_irq(p, 1);
  }
  
  static inline void octeon_mgmt_disable_tx_irq(struct octeon_mgmt *p)
  {
  	octeon_mgmt_set_tx_irq(p, 0);
  }
  
  static unsigned int ring_max_fill(unsigned int ring_size)
  {
  	return ring_size - 8;
  }
  
  static unsigned int ring_size_to_bytes(unsigned int ring_size)
  {
  	return ring_size * sizeof(union mgmt_port_ring_entry);
  }
  
  static void octeon_mgmt_rx_fill_ring(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  
  	while (p->rx_current_fill < ring_max_fill(OCTEON_MGMT_RX_RING_SIZE)) {
  		unsigned int size;
  		union mgmt_port_ring_entry re;
  		struct sk_buff *skb;
  
  		/* CN56XX pass 1 needs 8 bytes of padding.  */
  		size = netdev->mtu + OCTEON_MGMT_RX_HEADROOM + 8 + NET_IP_ALIGN;
  
  		skb = netdev_alloc_skb(netdev, size);
  		if (!skb)
  			break;
  		skb_reserve(skb, NET_IP_ALIGN);
  		__skb_queue_tail(&p->rx_list, skb);
  
  		re.d64 = 0;
  		re.s.len = size;
  		re.s.addr = dma_map_single(p->dev, skb->data,
  					   size,
  					   DMA_FROM_DEVICE);
  
  		/* Put it in the ring.  */
  		p->rx_ring[p->rx_next_fill] = re.d64;
  		dma_sync_single_for_device(p->dev, p->rx_ring_handle,
  					   ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
  					   DMA_BIDIRECTIONAL);
  		p->rx_next_fill =
  			(p->rx_next_fill + 1) % OCTEON_MGMT_RX_RING_SIZE;
  		p->rx_current_fill++;
  		/* Ring the bell.  */
  		cvmx_write_csr(CVMX_MIXX_IRING2(port), 1);
  	}
  }
  
  static void octeon_mgmt_clean_tx_buffers(struct octeon_mgmt *p)
  {
  	int port = p->port;
  	union cvmx_mixx_orcnt mix_orcnt;
  	union mgmt_port_ring_entry re;
  	struct sk_buff *skb;
  	int cleaned = 0;
  	unsigned long flags;
  
  	mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
  	while (mix_orcnt.s.orcnt) {
  		spin_lock_irqsave(&p->tx_list.lock, flags);
  
  		mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
  
  		if (mix_orcnt.s.orcnt == 0) {
  			spin_unlock_irqrestore(&p->tx_list.lock, flags);
  			break;
  		}
  
  		dma_sync_single_for_cpu(p->dev, p->tx_ring_handle,
  					ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
  					DMA_BIDIRECTIONAL);
  
  		re.d64 = p->tx_ring[p->tx_next_clean];
  		p->tx_next_clean =
  			(p->tx_next_clean + 1) % OCTEON_MGMT_TX_RING_SIZE;
  		skb = __skb_dequeue(&p->tx_list);
  
  		mix_orcnt.u64 = 0;
  		mix_orcnt.s.orcnt = 1;
  
  		/* Acknowledge to hardware that we have the buffer.  */
  		cvmx_write_csr(CVMX_MIXX_ORCNT(port), mix_orcnt.u64);
  		p->tx_current_fill--;
  
  		spin_unlock_irqrestore(&p->tx_list.lock, flags);
  
  		dma_unmap_single(p->dev, re.s.addr, re.s.len,
  				 DMA_TO_DEVICE);
  		dev_kfree_skb_any(skb);
  		cleaned++;
  
  		mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
  	}
  
  	if (cleaned && netif_queue_stopped(p->netdev))
  		netif_wake_queue(p->netdev);
  }
  
  static void octeon_mgmt_clean_tx_tasklet(unsigned long arg)
  {
  	struct octeon_mgmt *p = (struct octeon_mgmt *)arg;
  	octeon_mgmt_clean_tx_buffers(p);
  	octeon_mgmt_enable_tx_irq(p);
  }
  
  static void octeon_mgmt_update_rx_stats(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	unsigned long flags;
  	u64 drop, bad;
  
  	/* These reads also clear the count registers.  */
  	drop = cvmx_read_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_DRP(port));
  	bad = cvmx_read_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_BAD(port));
  
  	if (drop || bad) {
  		/* Do an atomic update. */
  		spin_lock_irqsave(&p->lock, flags);
  		netdev->stats.rx_errors += bad;
  		netdev->stats.rx_dropped += drop;
  		spin_unlock_irqrestore(&p->lock, flags);
  	}
  }
  
  static void octeon_mgmt_update_tx_stats(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	unsigned long flags;
  
  	union cvmx_agl_gmx_txx_stat0 s0;
  	union cvmx_agl_gmx_txx_stat1 s1;
  
  	/* These reads also clear the count registers.  */
  	s0.u64 = cvmx_read_csr(CVMX_AGL_GMX_TXX_STAT0(port));
  	s1.u64 = cvmx_read_csr(CVMX_AGL_GMX_TXX_STAT1(port));
  
  	if (s0.s.xsdef || s0.s.xscol || s1.s.scol || s1.s.mcol) {
  		/* Do an atomic update. */
  		spin_lock_irqsave(&p->lock, flags);
  		netdev->stats.tx_errors += s0.s.xsdef + s0.s.xscol;
  		netdev->stats.collisions += s1.s.scol + s1.s.mcol;
  		spin_unlock_irqrestore(&p->lock, flags);
  	}
  }
  
  /*
   * Dequeue a receive skb and its corresponding ring entry.  The ring
   * entry is returned, *pskb is updated to point to the skb.
   */
  static u64 octeon_mgmt_dequeue_rx_buffer(struct octeon_mgmt *p,
  					 struct sk_buff **pskb)
  {
  	union mgmt_port_ring_entry re;
  
  	dma_sync_single_for_cpu(p->dev, p->rx_ring_handle,
  				ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
  				DMA_BIDIRECTIONAL);
  
  	re.d64 = p->rx_ring[p->rx_next];
  	p->rx_next = (p->rx_next + 1) % OCTEON_MGMT_RX_RING_SIZE;
  	p->rx_current_fill--;
  	*pskb = __skb_dequeue(&p->rx_list);
  
  	dma_unmap_single(p->dev, re.s.addr,
  			 ETH_FRAME_LEN + OCTEON_MGMT_RX_HEADROOM,
  			 DMA_FROM_DEVICE);
  
  	return re.d64;
  }
  
  
  static int octeon_mgmt_receive_one(struct octeon_mgmt *p)
  {
  	int port = p->port;
  	struct net_device *netdev = p->netdev;
  	union cvmx_mixx_ircnt mix_ircnt;
  	union mgmt_port_ring_entry re;
  	struct sk_buff *skb;
  	struct sk_buff *skb2;
  	struct sk_buff *skb_new;
  	union mgmt_port_ring_entry re2;
  	int rc = 1;
  
  
  	re.d64 = octeon_mgmt_dequeue_rx_buffer(p, &skb);
  	if (likely(re.s.code == RING_ENTRY_CODE_DONE)) {
  		/* A good packet, send it up. */
  		skb_put(skb, re.s.len);
  good:
  		skb->protocol = eth_type_trans(skb, netdev);
  		netdev->stats.rx_packets++;
  		netdev->stats.rx_bytes += skb->len;
  		netif_receive_skb(skb);
  		rc = 0;
  	} else if (re.s.code == RING_ENTRY_CODE_MORE) {
  		/*
  		 * Packet split across skbs.  This can happen if we
  		 * increase the MTU.  Buffers that are already in the
  		 * rx ring can then end up being too small.  As the rx
  		 * ring is refilled, buffers sized for the new MTU
  		 * will be used and we should go back to the normal
  		 * non-split case.
  		 */
  		skb_put(skb, re.s.len);
  		do {
  			re2.d64 = octeon_mgmt_dequeue_rx_buffer(p, &skb2);
  			if (re2.s.code != RING_ENTRY_CODE_MORE
  				&& re2.s.code != RING_ENTRY_CODE_DONE)
  				goto split_error;
  			skb_put(skb2,  re2.s.len);
  			skb_new = skb_copy_expand(skb, 0, skb2->len,
  						  GFP_ATOMIC);
  			if (!skb_new)
  				goto split_error;
  			if (skb_copy_bits(skb2, 0, skb_tail_pointer(skb_new),
  					  skb2->len))
  				goto split_error;
  			skb_put(skb_new, skb2->len);
  			dev_kfree_skb_any(skb);
  			dev_kfree_skb_any(skb2);
  			skb = skb_new;
  		} while (re2.s.code == RING_ENTRY_CODE_MORE);
  		goto good;
  	} else {
  		/* Some other error, discard it. */
  		dev_kfree_skb_any(skb);
  		/*
  		 * Error statistics are accumulated in
  		 * octeon_mgmt_update_rx_stats.
  		 */
  	}
  	goto done;
  split_error:
  	/* Discard the whole mess. */
  	dev_kfree_skb_any(skb);
  	dev_kfree_skb_any(skb2);
  	while (re2.s.code == RING_ENTRY_CODE_MORE) {
  		re2.d64 = octeon_mgmt_dequeue_rx_buffer(p, &skb2);
  		dev_kfree_skb_any(skb2);
  	}
  	netdev->stats.rx_errors++;
  
  done:
  	/* Tell the hardware we processed a packet.  */
  	mix_ircnt.u64 = 0;
  	mix_ircnt.s.ircnt = 1;
  	cvmx_write_csr(CVMX_MIXX_IRCNT(port), mix_ircnt.u64);
  	return rc;
  }
  
  static int octeon_mgmt_receive_packets(struct octeon_mgmt *p, int budget)
  {
  	int port = p->port;
  	unsigned int work_done = 0;
  	union cvmx_mixx_ircnt mix_ircnt;
  	int rc;
  
  	mix_ircnt.u64 = cvmx_read_csr(CVMX_MIXX_IRCNT(port));
  	while (work_done < budget && mix_ircnt.s.ircnt) {
  
  		rc = octeon_mgmt_receive_one(p);
  		if (!rc)
  			work_done++;
  
  		/* Check for more packets. */
  		mix_ircnt.u64 = cvmx_read_csr(CVMX_MIXX_IRCNT(port));
  	}
  
  	octeon_mgmt_rx_fill_ring(p->netdev);
  
  	return work_done;
  }
  
  static int octeon_mgmt_napi_poll(struct napi_struct *napi, int budget)
  {
  	struct octeon_mgmt *p = container_of(napi, struct octeon_mgmt, napi);
  	struct net_device *netdev = p->netdev;
  	unsigned int work_done = 0;
  
  	work_done = octeon_mgmt_receive_packets(p, budget);
  
  	if (work_done < budget) {
  		/* We stopped because no more packets were available. */
  		napi_complete(napi);
  		octeon_mgmt_enable_rx_irq(p);
  	}
  	octeon_mgmt_update_rx_stats(netdev);
  
  	return work_done;
  }
  
  /* Reset the hardware to clean state.  */
  static void octeon_mgmt_reset_hw(struct octeon_mgmt *p)
  {
  	union cvmx_mixx_ctl mix_ctl;
  	union cvmx_mixx_bist mix_bist;
  	union cvmx_agl_gmx_bist agl_gmx_bist;
  
  	mix_ctl.u64 = 0;
  	cvmx_write_csr(CVMX_MIXX_CTL(p->port), mix_ctl.u64);
  	do {
  		mix_ctl.u64 = cvmx_read_csr(CVMX_MIXX_CTL(p->port));
  	} while (mix_ctl.s.busy);
  	mix_ctl.s.reset = 1;
  	cvmx_write_csr(CVMX_MIXX_CTL(p->port), mix_ctl.u64);
  	cvmx_read_csr(CVMX_MIXX_CTL(p->port));
  	cvmx_wait(64);
  
  	mix_bist.u64 = cvmx_read_csr(CVMX_MIXX_BIST(p->port));
  	if (mix_bist.u64)
  		dev_warn(p->dev, "MIX failed BIST (0x%016llx)\n",
  			(unsigned long long)mix_bist.u64);
  
  	agl_gmx_bist.u64 = cvmx_read_csr(CVMX_AGL_GMX_BIST);
  	if (agl_gmx_bist.u64)
  		dev_warn(p->dev, "AGL failed BIST (0x%016llx)\n",
  			 (unsigned long long)agl_gmx_bist.u64);
  }
  
  struct octeon_mgmt_cam_state {
  	u64 cam[6];
  	u64 cam_mask;
  	int cam_index;
  };
  
  static void octeon_mgmt_cam_state_add(struct octeon_mgmt_cam_state *cs,
  				      unsigned char *addr)
  {
  	int i;
  
  	for (i = 0; i < 6; i++)
  		cs->cam[i] |= (u64)addr[i] << (8 * (cs->cam_index));
  	cs->cam_mask |= (1ULL << cs->cam_index);
  	cs->cam_index++;
  }
  
  static void octeon_mgmt_set_rx_filtering(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	union cvmx_agl_gmx_rxx_adr_ctl adr_ctl;
  	union cvmx_agl_gmx_prtx_cfg agl_gmx_prtx;
  	unsigned long flags;
  	unsigned int prev_packet_enable;
  	unsigned int cam_mode = 1; /* 1 - Accept on CAM match */
  	unsigned int multicast_mode = 1; /* 1 - Reject all multicast.  */
  	struct octeon_mgmt_cam_state cam_state;
  	struct netdev_hw_addr *ha;
  	int available_cam_entries;
  
  	memset(&cam_state, 0, sizeof(cam_state));
  
  	if ((netdev->flags & IFF_PROMISC) || netdev->uc.count > 7) {
  		cam_mode = 0;
  		available_cam_entries = 8;
  	} else {
  		/*
  		 * One CAM entry for the primary address, leaves seven
  		 * for the secondary addresses.
  		 */
  		available_cam_entries = 7 - netdev->uc.count;
  	}
  
  	if (netdev->flags & IFF_MULTICAST) {
  		if (cam_mode == 0 || (netdev->flags & IFF_ALLMULTI) ||
  		    netdev_mc_count(netdev) > available_cam_entries)
  			multicast_mode = 2; /* 2 - Accept all multicast.  */
  		else
  			multicast_mode = 0; /* 0 - Use CAM.  */
  	}
  
  	if (cam_mode == 1) {
  		/* Add primary address. */
  		octeon_mgmt_cam_state_add(&cam_state, netdev->dev_addr);
  		netdev_for_each_uc_addr(ha, netdev)
  			octeon_mgmt_cam_state_add(&cam_state, ha->addr);
  	}
  	if (multicast_mode == 0) {
  		netdev_for_each_mc_addr(ha, netdev)
  			octeon_mgmt_cam_state_add(&cam_state, ha->addr);
  	}
  
  	spin_lock_irqsave(&p->lock, flags);
  
  	/* Disable packet I/O. */
  	agl_gmx_prtx.u64 = cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
  	prev_packet_enable = agl_gmx_prtx.s.en;
  	agl_gmx_prtx.s.en = 0;
  	cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
  
  	adr_ctl.u64 = 0;
  	adr_ctl.s.cam_mode = cam_mode;
  	adr_ctl.s.mcst = multicast_mode;
  	adr_ctl.s.bcst = 1;     /* Allow broadcast */
  
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CTL(port), adr_ctl.u64);
  
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM0(port), cam_state.cam[0]);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM1(port), cam_state.cam[1]);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM2(port), cam_state.cam[2]);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM3(port), cam_state.cam[3]);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM4(port), cam_state.cam[4]);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM5(port), cam_state.cam[5]);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM_EN(port), cam_state.cam_mask);
  
  	/* Restore packet I/O. */
  	agl_gmx_prtx.s.en = prev_packet_enable;
  	cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
  
  	spin_unlock_irqrestore(&p->lock, flags);
  }
  
  static int octeon_mgmt_set_mac_address(struct net_device *netdev, void *addr)
  {
  	struct sockaddr *sa = addr;
  
  	if (!is_valid_ether_addr(sa->sa_data))
  		return -EADDRNOTAVAIL;
  
  	memcpy(netdev->dev_addr, sa->sa_data, ETH_ALEN);
  
  	octeon_mgmt_set_rx_filtering(netdev);
  
  	return 0;
  }
  
  static int octeon_mgmt_change_mtu(struct net_device *netdev, int new_mtu)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	int size_without_fcs = new_mtu + OCTEON_MGMT_RX_HEADROOM;
  
  	/*
  	 * Limit the MTU to make sure the ethernet packets are between
  	 * 64 bytes and 16383 bytes.
  	 */
  	if (size_without_fcs < 64 || size_without_fcs > 16383) {
  		dev_warn(p->dev, "MTU must be between %d and %d.\n",
  			 64 - OCTEON_MGMT_RX_HEADROOM,
  			 16383 - OCTEON_MGMT_RX_HEADROOM);
  		return -EINVAL;
  	}
  
  	netdev->mtu = new_mtu;
  
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_FRM_MAX(port), size_without_fcs);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_JABBER(port),
  		       (size_without_fcs + 7) & 0xfff8);
  
  	return 0;
  }
  
  static irqreturn_t octeon_mgmt_interrupt(int cpl, void *dev_id)
  {
  	struct net_device *netdev = dev_id;
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	union cvmx_mixx_isr mixx_isr;
  
  	mixx_isr.u64 = cvmx_read_csr(CVMX_MIXX_ISR(port));
  
  	/* Clear any pending interrupts */
  	cvmx_write_csr(CVMX_MIXX_ISR(port), mixx_isr.u64);
  	cvmx_read_csr(CVMX_MIXX_ISR(port));
  
  	if (mixx_isr.s.irthresh) {
  		octeon_mgmt_disable_rx_irq(p);
  		napi_schedule(&p->napi);
  	}
  	if (mixx_isr.s.orthresh) {
  		octeon_mgmt_disable_tx_irq(p);
  		tasklet_schedule(&p->tx_clean_tasklet);
  	}
  
  	return IRQ_HANDLED;
  }
  
  static int octeon_mgmt_ioctl(struct net_device *netdev,
  			     struct ifreq *rq, int cmd)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  
  	if (!netif_running(netdev))
  		return -EINVAL;
  
  	if (!p->phydev)
  		return -EINVAL;
  
  	return phy_mii_ioctl(p->phydev, rq, cmd);
  }
  
  static void octeon_mgmt_adjust_link(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	union cvmx_agl_gmx_prtx_cfg prtx_cfg;
  	unsigned long flags;
  	int link_changed = 0;
  
  	spin_lock_irqsave(&p->lock, flags);
  	if (p->phydev->link) {
  		if (!p->last_link)
  			link_changed = 1;
  		if (p->last_duplex != p->phydev->duplex) {
  			p->last_duplex = p->phydev->duplex;
  			prtx_cfg.u64 =
  				cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
  			prtx_cfg.s.duplex = p->phydev->duplex;
  			cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port),
  				       prtx_cfg.u64);
  		}
  	} else {
  		if (p->last_link)
  			link_changed = -1;
  	}
  	p->last_link = p->phydev->link;
  	spin_unlock_irqrestore(&p->lock, flags);
  
  	if (link_changed != 0) {
  		if (link_changed > 0) {
  			netif_carrier_on(netdev);
  			pr_info("%s: Link is up - %d/%s\n", netdev->name,
  				p->phydev->speed,
  				DUPLEX_FULL == p->phydev->duplex ?
  				"Full" : "Half");
  		} else {
  			netif_carrier_off(netdev);
  			pr_info("%s: Link is down\n", netdev->name);
  		}
  	}
  }
  
  static int octeon_mgmt_init_phy(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	char phy_id[MII_BUS_ID_SIZE + 3];
  
  	if (octeon_is_simulation()) {
  		/* No PHYs in the simulator. */
  		netif_carrier_on(netdev);
  		return 0;
  	}
  
  	snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT, "mdio-octeon-0", p->port);
  
  	p->phydev = phy_connect(netdev, phy_id, octeon_mgmt_adjust_link, 0,
  				PHY_INTERFACE_MODE_MII);
  
  	if (IS_ERR(p->phydev)) {
  		p->phydev = NULL;
  		return -1;
  	}
  
  	phy_start_aneg(p->phydev);
  
  	return 0;
  }
  
  static int octeon_mgmt_open(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	union cvmx_mixx_ctl mix_ctl;
  	union cvmx_agl_gmx_inf_mode agl_gmx_inf_mode;
  	union cvmx_mixx_oring1 oring1;
  	union cvmx_mixx_iring1 iring1;
  	union cvmx_agl_gmx_prtx_cfg prtx_cfg;
  	union cvmx_agl_gmx_rxx_frm_ctl rxx_frm_ctl;
  	union cvmx_mixx_irhwm mix_irhwm;
  	union cvmx_mixx_orhwm mix_orhwm;
  	union cvmx_mixx_intena mix_intena;
  	struct sockaddr sa;
  
  	/* Allocate ring buffers.  */
  	p->tx_ring = kzalloc(ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
  			     GFP_KERNEL);
  	if (!p->tx_ring)
  		return -ENOMEM;
  	p->tx_ring_handle =
  		dma_map_single(p->dev, p->tx_ring,
  			       ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
  			       DMA_BIDIRECTIONAL);
  	p->tx_next = 0;
  	p->tx_next_clean = 0;
  	p->tx_current_fill = 0;
  
  
  	p->rx_ring = kzalloc(ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
  			     GFP_KERNEL);
  	if (!p->rx_ring)
  		goto err_nomem;
  	p->rx_ring_handle =
  		dma_map_single(p->dev, p->rx_ring,
  			       ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
  			       DMA_BIDIRECTIONAL);
  
  	p->rx_next = 0;
  	p->rx_next_fill = 0;
  	p->rx_current_fill = 0;
  
  	octeon_mgmt_reset_hw(p);
  
  	mix_ctl.u64 = cvmx_read_csr(CVMX_MIXX_CTL(port));
  
  	/* Bring it out of reset if needed. */
  	if (mix_ctl.s.reset) {
  		mix_ctl.s.reset = 0;
  		cvmx_write_csr(CVMX_MIXX_CTL(port), mix_ctl.u64);
  		do {
  			mix_ctl.u64 = cvmx_read_csr(CVMX_MIXX_CTL(port));
  		} while (mix_ctl.s.reset);
  	}
  
  	agl_gmx_inf_mode.u64 = 0;
  	agl_gmx_inf_mode.s.en = 1;
  	cvmx_write_csr(CVMX_AGL_GMX_INF_MODE, agl_gmx_inf_mode.u64);
  
  	oring1.u64 = 0;
  	oring1.s.obase = p->tx_ring_handle >> 3;
  	oring1.s.osize = OCTEON_MGMT_TX_RING_SIZE;
  	cvmx_write_csr(CVMX_MIXX_ORING1(port), oring1.u64);
  
  	iring1.u64 = 0;
  	iring1.s.ibase = p->rx_ring_handle >> 3;
  	iring1.s.isize = OCTEON_MGMT_RX_RING_SIZE;
  	cvmx_write_csr(CVMX_MIXX_IRING1(port), iring1.u64);
  
  	/* Disable packet I/O. */
  	prtx_cfg.u64 = cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
  	prtx_cfg.s.en = 0;
  	cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), prtx_cfg.u64);
  
  	memcpy(sa.sa_data, netdev->dev_addr, ETH_ALEN);
  	octeon_mgmt_set_mac_address(netdev, &sa);
  
  	octeon_mgmt_change_mtu(netdev, netdev->mtu);
  
  	/*
  	 * Enable the port HW. Packets are not allowed until
  	 * cvmx_mgmt_port_enable() is called.
  	 */
  	mix_ctl.u64 = 0;
  	mix_ctl.s.crc_strip = 1;    /* Strip the ending CRC */
  	mix_ctl.s.en = 1;           /* Enable the port */
  	mix_ctl.s.nbtarb = 0;       /* Arbitration mode */
  	/* MII CB-request FIFO programmable high watermark */
  	mix_ctl.s.mrq_hwm = 1;
  	cvmx_write_csr(CVMX_MIXX_CTL(port), mix_ctl.u64);
  
  	if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)
  	    || OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
  		/*
  		 * Force compensation values, as they are not
  		 * determined properly by HW
  		 */
  		union cvmx_agl_gmx_drv_ctl drv_ctl;
  
  		drv_ctl.u64 = cvmx_read_csr(CVMX_AGL_GMX_DRV_CTL);
  		if (port) {
  			drv_ctl.s.byp_en1 = 1;
  			drv_ctl.s.nctl1 = 6;
  			drv_ctl.s.pctl1 = 6;
  		} else {
  			drv_ctl.s.byp_en = 1;
  			drv_ctl.s.nctl = 6;
  			drv_ctl.s.pctl = 6;
  		}
  		cvmx_write_csr(CVMX_AGL_GMX_DRV_CTL, drv_ctl.u64);
  	}
  
  	octeon_mgmt_rx_fill_ring(netdev);
  
  	/* Clear statistics. */
  	/* Clear on read. */
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_STATS_CTL(port), 1);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_DRP(port), 0);
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_BAD(port), 0);
  
  	cvmx_write_csr(CVMX_AGL_GMX_TXX_STATS_CTL(port), 1);
  	cvmx_write_csr(CVMX_AGL_GMX_TXX_STAT0(port), 0);
  	cvmx_write_csr(CVMX_AGL_GMX_TXX_STAT1(port), 0);
  
  	/* Clear any pending interrupts */
  	cvmx_write_csr(CVMX_MIXX_ISR(port), cvmx_read_csr(CVMX_MIXX_ISR(port)));
  
  	if (request_irq(p->irq, octeon_mgmt_interrupt, 0, netdev->name,
  			netdev)) {
  		dev_err(p->dev, "request_irq(%d) failed.\n", p->irq);
  		goto err_noirq;
  	}
  
  	/* Interrupt every single RX packet */
  	mix_irhwm.u64 = 0;
  	mix_irhwm.s.irhwm = 0;
  	cvmx_write_csr(CVMX_MIXX_IRHWM(port), mix_irhwm.u64);
  
  	/* Interrupt when we have 1 or more packets to clean.  */
  	mix_orhwm.u64 = 0;
  	mix_orhwm.s.orhwm = 1;
  	cvmx_write_csr(CVMX_MIXX_ORHWM(port), mix_orhwm.u64);
  
  	/* Enable receive and transmit interrupts */
  	mix_intena.u64 = 0;
  	mix_intena.s.ithena = 1;
  	mix_intena.s.othena = 1;
  	cvmx_write_csr(CVMX_MIXX_INTENA(port), mix_intena.u64);
  
  
  	/* Enable packet I/O. */
  
  	rxx_frm_ctl.u64 = 0;
  	rxx_frm_ctl.s.pre_align = 1;
  	/*
  	 * When set, disables the length check for non-min sized pkts
  	 * with padding in the client data.
  	 */
  	rxx_frm_ctl.s.pad_len = 1;
  	/* When set, disables the length check for VLAN pkts */
  	rxx_frm_ctl.s.vlan_len = 1;
  	/* When set, PREAMBLE checking is  less strict */
  	rxx_frm_ctl.s.pre_free = 1;
  	/* Control Pause Frames can match station SMAC */
  	rxx_frm_ctl.s.ctl_smac = 0;
  	/* Control Pause Frames can match globally assign Multicast address */
  	rxx_frm_ctl.s.ctl_mcst = 1;
  	/* Forward pause information to TX block */
  	rxx_frm_ctl.s.ctl_bck = 1;
  	/* Drop Control Pause Frames */
  	rxx_frm_ctl.s.ctl_drp = 1;
  	/* Strip off the preamble */
  	rxx_frm_ctl.s.pre_strp = 1;
  	/*
  	 * This port is configured to send PREAMBLE+SFD to begin every
  	 * frame.  GMX checks that the PREAMBLE is sent correctly.
  	 */
  	rxx_frm_ctl.s.pre_chk = 1;
  	cvmx_write_csr(CVMX_AGL_GMX_RXX_FRM_CTL(port), rxx_frm_ctl.u64);
  
  	/* Enable the AGL block */
  	agl_gmx_inf_mode.u64 = 0;
  	agl_gmx_inf_mode.s.en = 1;
  	cvmx_write_csr(CVMX_AGL_GMX_INF_MODE, agl_gmx_inf_mode.u64);
  
  	/* Configure the port duplex and enables */
  	prtx_cfg.u64 = cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
  	prtx_cfg.s.tx_en = 1;
  	prtx_cfg.s.rx_en = 1;
  	prtx_cfg.s.en = 1;
  	p->last_duplex = 1;
  	prtx_cfg.s.duplex = p->last_duplex;
  	cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), prtx_cfg.u64);
  
  	p->last_link = 0;
  	netif_carrier_off(netdev);
  
  	if (octeon_mgmt_init_phy(netdev)) {
  		dev_err(p->dev, "Cannot initialize PHY.\n");
  		goto err_noirq;
  	}
  
  	netif_wake_queue(netdev);
  	napi_enable(&p->napi);
  
  	return 0;
  err_noirq:
  	octeon_mgmt_reset_hw(p);
  	dma_unmap_single(p->dev, p->rx_ring_handle,
  			 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
  			 DMA_BIDIRECTIONAL);
  	kfree(p->rx_ring);
  err_nomem:
  	dma_unmap_single(p->dev, p->tx_ring_handle,
  			 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
  			 DMA_BIDIRECTIONAL);
  	kfree(p->tx_ring);
  	return -ENOMEM;
  }
  
  static int octeon_mgmt_stop(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  
  	napi_disable(&p->napi);
  	netif_stop_queue(netdev);
  
  	if (p->phydev)
  		phy_disconnect(p->phydev);
  
  	netif_carrier_off(netdev);
  
  	octeon_mgmt_reset_hw(p);
  
  	free_irq(p->irq, netdev);
  
  	/* dma_unmap is a nop on Octeon, so just free everything.  */
  	skb_queue_purge(&p->tx_list);
  	skb_queue_purge(&p->rx_list);
  
  	dma_unmap_single(p->dev, p->rx_ring_handle,
  			 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
  			 DMA_BIDIRECTIONAL);
  	kfree(p->rx_ring);
  
  	dma_unmap_single(p->dev, p->tx_ring_handle,
  			 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
  			 DMA_BIDIRECTIONAL);
  	kfree(p->tx_ring);
  
  	return 0;
  }
  
  static int octeon_mgmt_xmit(struct sk_buff *skb, struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  	int port = p->port;
  	union mgmt_port_ring_entry re;
  	unsigned long flags;
  	int rv = NETDEV_TX_BUSY;
  
  	re.d64 = 0;
  	re.s.len = skb->len;
  	re.s.addr = dma_map_single(p->dev, skb->data,
  				   skb->len,
  				   DMA_TO_DEVICE);
  
  	spin_lock_irqsave(&p->tx_list.lock, flags);
  
  	if (unlikely(p->tx_current_fill >= ring_max_fill(OCTEON_MGMT_TX_RING_SIZE) - 1)) {
  		spin_unlock_irqrestore(&p->tx_list.lock, flags);
  		netif_stop_queue(netdev);
  		spin_lock_irqsave(&p->tx_list.lock, flags);
  	}
  
  	if (unlikely(p->tx_current_fill >=
  		     ring_max_fill(OCTEON_MGMT_TX_RING_SIZE))) {
  		spin_unlock_irqrestore(&p->tx_list.lock, flags);
  		dma_unmap_single(p->dev, re.s.addr, re.s.len,
  				 DMA_TO_DEVICE);
  		goto out;
  	}
  
  	__skb_queue_tail(&p->tx_list, skb);
  
  	/* Put it in the ring.  */
  	p->tx_ring[p->tx_next] = re.d64;
  	p->tx_next = (p->tx_next + 1) % OCTEON_MGMT_TX_RING_SIZE;
  	p->tx_current_fill++;
  
  	spin_unlock_irqrestore(&p->tx_list.lock, flags);
  
  	dma_sync_single_for_device(p->dev, p->tx_ring_handle,
  				   ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
  				   DMA_BIDIRECTIONAL);
  
  	netdev->stats.tx_packets++;
  	netdev->stats.tx_bytes += skb->len;
  
  	/* Ring the bell.  */
  	cvmx_write_csr(CVMX_MIXX_ORING2(port), 1);
  
  	rv = NETDEV_TX_OK;
  out:
  	octeon_mgmt_update_tx_stats(netdev);
  	return rv;
  }
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  static void octeon_mgmt_poll_controller(struct net_device *netdev)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  
  	octeon_mgmt_receive_packets(p, 16);
  	octeon_mgmt_update_rx_stats(netdev);
  }
  #endif
  
  static void octeon_mgmt_get_drvinfo(struct net_device *netdev,
  				    struct ethtool_drvinfo *info)
  {
  	strncpy(info->driver, DRV_NAME, sizeof(info->driver));
  	strncpy(info->version, DRV_VERSION, sizeof(info->version));
  	strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
  	strncpy(info->bus_info, "N/A", sizeof(info->bus_info));
  	info->n_stats = 0;
  	info->testinfo_len = 0;
  	info->regdump_len = 0;
  	info->eedump_len = 0;
  }
  
  static int octeon_mgmt_get_settings(struct net_device *netdev,
  				    struct ethtool_cmd *cmd)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  
  	if (p->phydev)
  		return phy_ethtool_gset(p->phydev, cmd);
  
  	return -EINVAL;
  }
  
  static int octeon_mgmt_set_settings(struct net_device *netdev,
  				    struct ethtool_cmd *cmd)
  {
  	struct octeon_mgmt *p = netdev_priv(netdev);
  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;
  
  	if (p->phydev)
  		return phy_ethtool_sset(p->phydev, cmd);
  
  	return -EINVAL;
  }
  
  static const struct ethtool_ops octeon_mgmt_ethtool_ops = {
  	.get_drvinfo = octeon_mgmt_get_drvinfo,
  	.get_link = ethtool_op_get_link,
  	.get_settings = octeon_mgmt_get_settings,
  	.set_settings = octeon_mgmt_set_settings
  };
  
  static const struct net_device_ops octeon_mgmt_ops = {
  	.ndo_open =			octeon_mgmt_open,
  	.ndo_stop =			octeon_mgmt_stop,
  	.ndo_start_xmit =		octeon_mgmt_xmit,
  	.ndo_set_rx_mode = 		octeon_mgmt_set_rx_filtering,
  	.ndo_set_mac_address =		octeon_mgmt_set_mac_address,
  	.ndo_do_ioctl = 		octeon_mgmt_ioctl,
  	.ndo_change_mtu =		octeon_mgmt_change_mtu,
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_poll_controller =		octeon_mgmt_poll_controller,
  #endif
  };
  
  static int __devinit octeon_mgmt_probe(struct platform_device *pdev)
  {
  	struct resource *res_irq;
  	struct net_device *netdev;
  	struct octeon_mgmt *p;
  	int i;
  
  	netdev = alloc_etherdev(sizeof(struct octeon_mgmt));
  	if (netdev == NULL)
  		return -ENOMEM;
  
  	dev_set_drvdata(&pdev->dev, netdev);
  	p = netdev_priv(netdev);
  	netif_napi_add(netdev, &p->napi, octeon_mgmt_napi_poll,
  		       OCTEON_MGMT_NAPI_WEIGHT);
  
  	p->netdev = netdev;
  	p->dev = &pdev->dev;
  
  	p->port = pdev->id;
  	snprintf(netdev->name, IFNAMSIZ, "mgmt%d", p->port);
  
  	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  	if (!res_irq)
  		goto err;
  
  	p->irq = res_irq->start;
  	spin_lock_init(&p->lock);
  
  	skb_queue_head_init(&p->tx_list);
  	skb_queue_head_init(&p->rx_list);
  	tasklet_init(&p->tx_clean_tasklet,
  		     octeon_mgmt_clean_tx_tasklet, (unsigned long)p);
  
  	netdev->priv_flags |= IFF_UNICAST_FLT;
  
  	netdev->netdev_ops = &octeon_mgmt_ops;
  	netdev->ethtool_ops = &octeon_mgmt_ethtool_ops;
  
  	/* The mgmt ports get the first N MACs.  */
  	for (i = 0; i < 6; i++)
  		netdev->dev_addr[i] = octeon_bootinfo->mac_addr_base[i];
  	netdev->dev_addr[5] += p->port;
  
  	if (p->port >= octeon_bootinfo->mac_addr_count)
  		dev_err(&pdev->dev,
  			"Error %s: Using MAC outside of the assigned range: %pM\n",
  			netdev->name, netdev->dev_addr);
  
  	if (register_netdev(netdev))
  		goto err;
  
  	dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
  	return 0;
  err:
  	free_netdev(netdev);
  	return -ENOENT;
  }
  
  static int __devexit octeon_mgmt_remove(struct platform_device *pdev)
  {
  	struct net_device *netdev = dev_get_drvdata(&pdev->dev);
  
  	unregister_netdev(netdev);
  	free_netdev(netdev);
  	return 0;
  }
  
  static struct platform_driver octeon_mgmt_driver = {
  	.driver = {
  		.name		= "octeon_mgmt",
  		.owner		= THIS_MODULE,
  	},
  	.probe		= octeon_mgmt_probe,
  	.remove		= __devexit_p(octeon_mgmt_remove),
  };
  
  extern void octeon_mdiobus_force_mod_depencency(void);
  
  static int __init octeon_mgmt_mod_init(void)
  {
  	/* Force our mdiobus driver module to be loaded first. */
  	octeon_mdiobus_force_mod_depencency();
  	return platform_driver_register(&octeon_mgmt_driver);
  }
  
  static void __exit octeon_mgmt_mod_exit(void)
  {
  	platform_driver_unregister(&octeon_mgmt_driver);
  }
  
  module_init(octeon_mgmt_mod_init);
  module_exit(octeon_mgmt_mod_exit);
  
  MODULE_DESCRIPTION(DRV_DESCRIPTION);
  MODULE_AUTHOR("David Daney");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(DRV_VERSION);
  