ethernet/jcore_emac: add J-Core ethernet driverv4.6-rc5+j2

This is sloppy and not ready for upstream.

3 files changed, 1548 insertions, 0 deletions

diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 2ffd63463299..64b01f1f9d21 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -151,6 +151,10 @@ config ETHOC
 	---help---
 	  Say Y here if you want to use the OpenCores 10/100 Mbps Ethernet MAC.
 
+config JCORE_EMAC
+	tristate "J-Core Ethernet support"
+	depends on HAS_IOMEM && HAS_DMA
+
 source "drivers/net/ethernet/packetengines/Kconfig"
 source "drivers/net/ethernet/pasemi/Kconfig"
 source "drivers/net/ethernet/qlogic/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 1d349e9aa9a6..3d29404e492f 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -88,3 +88,4 @@ obj-$(CONFIG_NET_VENDOR_VIA) += via/
 obj-$(CONFIG_NET_VENDOR_WIZNET) += wiznet/
 obj-$(CONFIG_NET_VENDOR_XILINX) += xilinx/
 obj-$(CONFIG_NET_VENDOR_XIRCOM) += xircom/
+obj-$(CONFIG_JCORE_EMAC) += jcore_emac.o
diff --git a/drivers/net/ethernet/jcore_emac.c b/drivers/net/ethernet/jcore_emac.c
new file mode 100644
index 000000000000..d611b1e4d356
--- /dev/null
+++ b/drivers/net/ethernet/jcore_emac.c
@@ -0,0 +1,1543 @@
+/*
+ * sei_emac.c	SEI EMAC driver
+ *
+ * Copyright (c) 2012 Smart Energy Instruments Inc.
+ *               by Oleksandr G Zhadan
+ *
+ */
+#include <linux/init.h>
+#include <net/sock.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/udp.h>
+#include <linux/platform_device.h>
+#include <linux/etherdevice.h>
+#include <linux/netdevice.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <net/inet_sock.h>
+
+#include <linux/net_tstamp.h>
+#include <linux/timecounter.h>
+#include <linux/clocksource.h>
+
+#define Dprintk(fmt, ...)
+
+#define AFprintkTX(format, args...)
+//#define AFprintkTX printk
+
+#define AFprintkRX(format, args...)
+//#define AFprintkRX printk
+
+//#define DEBUG_ISR
+#ifdef DEBUG_ISR
+#define AFprintkISR printk
+#else
+#define AFprintkISR(format, args...)
+#endif
+
+//#define DEBUG_TX
+#ifdef DEBUG_TX
+#define AFprintkTXP printk
+#else
+#define AFprintkTXP(format, args...)
+#endif
+
+#define ASSERT(cond) { if((cond)) { panic("Assertion failed %s at %s:%d\n", #cond, __FILE__, __LINE__); } }
+
+#define	SEI_EMAC_NAPI_WEIGHT	64 // ???
+
+#define TX_TIMEOUT (2 * HZ)
+
+#define	SEI_EMAC_PINGPONG_BUFFERS	4
+
+#define SEI_EMAC_BASE		0xABCE0000
+#define SEI_EMAC_CONTROL	0xABCE0000
+#define SEI_EMAC_STATUS		0xABCE0000
+#define SEI_EMAC_DEBUG		0xABCE0010
+
+/* Base/Control/Status registers bits */
+#define SEI_EMAC_RESET		0x00000000
+#define SEI_EMAC_ENABLE_RX	0x00000002
+#define SEI_EMAC_ENABLE_TX	0x00000004
+#define SEI_EMAC_BUSY		0x00000004
+#define SEI_EMAC_XMIT		0x00000004
+#define SEI_EMAC_MCAST		0x00000008
+#define SEI_EMAC_READ		0x00000010
+#define SEI_EMAC_ENABLE_INT_RX	0x00000020
+#define SEI_EMAC_ENABLE_INT_TX	0x00000040
+#define SEI_EMAC_PROMISC	0x00000080
+#define SEI_EMAC_COMPLETE	0x00000100
+#define SEI_EMAC_CRC		0x00000200
+
+#define SEI_EMAC_TX_LEN	0xABCE0004
+#define SEI_EMAC_MACL	0xABCE0008
+#define SEI_EMAC_MACH	0xABCE000C
+#define SEI_EMAC_RX_BUF	0xABCE1000
+#define SEI_EMAC_TX_BUF	0xABCE1800
+
+#define SEI_EMAC_MAX_MULTICAST_ADDRS	4
+
+// This is the system clock as kept by the FPGA
+#define SEI_TS_SEC_MSW			0xABCD0220
+#define SEI_TS_SEC_LSW			0xABCD0224
+#define SEI_TS_NSEC			0xABCD0228
+
+#define SEI_EMAC_TX_SOF_TS_SEC_MSW	0xABCE0020
+#define SEI_EMAC_TX_SOF_TS_SEC_LSW	0xABCE0024
+#define SEI_EMAC_TX_SOF_TS_NSEC		0xABCE0028
+
+#define SEI_EMAC_RX_SOF_TS_SEC_MSW	0xABCE0030
+#define SEI_EMAC_RX_SOF_TS_SEC_LSW	0xABCE0034
+#define SEI_EMAC_RX_SOF_TS_NSEC		0xABCE0038
+
+#define SEI_EMAC_TS_OFFSET		0xABCE0040 // where to insert the TS in the L2 frame, > 12
+
+#define SEI_EMAC_MCAST_MASK0		0xABCE0060 // mask for mcast frames
+#define SEI_EMAC_MCAST_MASK1		0xABCE0064 // mask for mcast frames
+#define SEI_EMAC_MCAST_MASK2		0xABCE0068 // mask for mcast frames
+#define SEI_EMAC_MCAST_MASK3		0xABCE006C // mask for mcast frames
+
+
+
+
+#define READ_DEBUG_REG (readl(SEI_EMAC_DEBUG))
+
+enum { FALSE, TRUE };
+
+static u32* sei_emac_hw_mcast_list[] = {
+  (u32*)SEI_EMAC_MCAST_MASK0,
+  (u32*)SEI_EMAC_MCAST_MASK1,
+  (u32*)SEI_EMAC_MCAST_MASK2,
+  (u32*)SEI_EMAC_MCAST_MASK3
+};
+
+#define sei_emac_hwtstamp_is_none(cfg) ((cfg) == HWTSTAMP_FILTER_NONE)
+
+#define PTP_EVENT_PORT		319
+#define PTP_GENERAL_PORT	320
+#define PTP_TS_OFFSET_V1	40 // in payload, on frame depends on UDPv4, UDPv6 or ETH_P_1588
+#define PTP_TS_OFFSET_V2	34 // in payload, on frame depends on UDPv4, UDPv6 or ETH_P_1588
+
+/* Values for the IEEE 1588 messageType field */
+#define SYNC                  0x0
+#define DELAY_REQ             0x1
+#define PDELAY_REQ            0x2
+#define PDELAY_RESP           0x3
+#define FOLLOW_UP             0x8
+#define DELAY_RESP            0x9
+#define PDELAY_RESP_FOLLOW_UP 0xA
+#define ANNOUNCE              0xB
+#define SIGNALING             0xC
+#define MANAGEMENT            0xD
+
+#define MAX_TX_ITEMS	16
+#define MAX_RX_ITEMS	32
+#define MAX_RX_RING_SZ	MAX_RX_ITEMS/2
+
+static int ptp_msg_types[] = {
+  SYNC,
+  DELAY_REQ,
+  PDELAY_REQ,
+  PDELAY_RESP,
+  FOLLOW_UP,
+  DELAY_RESP,
+  PDELAY_RESP_FOLLOW_UP,
+  ANNOUNCE,
+  SIGNALING,
+  MANAGEMENT,
+};
+#define PTP_MSG_TYPE_SZ (sizeof(ptp_msg_types) / sizeof(ptp_msg_types[0]))
+
+struct {
+  u32 tx_pkt;						///< All TXed packets
+  u32 tx_pkt_ts;					///< Pushed to RTL with TX hw tstamp
+  u32 tx_pkt_ts_mark;					///< Marked for TX hw tstamp in SKB flags
+  u32 tx_pkt_inval_off;					///< Calculated offset is invalid (< 14)
+  u32 tx_pkt_inval_ts;					///< TX Timestamp is (0, 0)
+  u32 rx_pkt;						///< RXed packets when SKBs in RX ring available
+  u32 all_irq;						///< All IRQs (TX/RX/CRC-error)
+  u32 tx_irq;
+  u32 rx_irq;
+  u32 rx_err;
+  u32 rx_full;						///< RX ring full (rx_items)
+  u32 tx_full;						///< TX ring full (tx_items)
+  u32 rx_refill;					///< how many times we (actually) refilled the RX ring
+  u32 rx_refill_sz[MAX_RX_RING_SZ];
+  u32 rx_pingpong_stats[SEI_EMAC_PINGPONG_BUFFERS];
+  u32 ptp_rx_stats[MANAGEMENT+1];
+  struct sei_emac_private* seip; ///< XXX HACK!
+  u32 multicast_all;					///< Shadow of private data multicast_all
+} Stats;
+
+typedef struct {
+	struct sk_buff* skb;
+	u32    tx_ts_off;
+	u64    sec;
+	u32    nsec;
+} tx_item_t;
+
+typedef struct {
+	struct sk_buff* skb;
+	u64    sec;
+	u32    nsec;
+} rx_item_t;
+
+struct sei_emac_private {
+	u32 sig; ///< Signature: 0xdeadbeef
+	struct net_device* dev;
+
+	int opened;
+	volatile int tx;
+	volatile u32 tx_ts_off;
+	struct sk_buff* tx_skb;
+
+	spinlock_t rx_lock;
+	spinlock_t tx_lock;
+
+	tx_item_t tx_items[MAX_TX_ITEMS];
+	rx_item_t rx_items[MAX_RX_ITEMS];
+	struct sk_buff* rx_ring[MAX_RX_RING_SZ]; ///< pre-allocated and refilled in BH to speed up ISR
+	struct work_struct refill_work;
+	int refill_warning; ///< warn only once per rx ring full event
+
+	struct napi_struct napi;
+
+	// flags
+	u32   promisc;
+	u32   multicast_all;
+
+        /* OS defined structs */
+	volatile struct hwtstamp_config stamp_cfg;
+
+        struct cyclecounter cycles;
+        struct timecounter clock;
+        struct hwtstamp_config hwtstamp_config;
+};
+
+#if 0
+static int hex_dump8(const char* msg, const u8* p, int const sz);
+#endif
+
+static inline void read_ts(u64* sec, u32* nsec)
+{
+	u32 sec_msw;
+	u32 sec_lsw;
+	u32 nsec_;
+	if(unlikely(sec == NULL || nsec == NULL)) return;
+
+	do {
+		sec_msw = readl(SEI_TS_SEC_MSW);
+		sec_lsw = readl(SEI_TS_SEC_LSW);
+		nsec_   = readl(SEI_TS_NSEC);
+	} while (sec_msw != readl(SEI_TS_SEC_MSW) || sec_lsw != readl(SEI_TS_SEC_LSW));
+	
+	*sec  = ((sec_msw + 0LL) << 32) | (sec_lsw + 0LL);
+	*nsec = nsec_;
+}
+
+static inline void read_tx_ts(u64* sec, u32* nsec)
+{
+	u32 sec_msw;
+	u32 sec_lsw;
+	u32 nsec_;
+	if(unlikely(sec == NULL || nsec == NULL)) return;
+
+	sec_msw = readl(SEI_EMAC_TX_SOF_TS_SEC_MSW);
+	sec_lsw = readl(SEI_EMAC_TX_SOF_TS_SEC_LSW);
+	nsec_   = readl(SEI_EMAC_TX_SOF_TS_NSEC);
+
+	*sec  = ((sec_msw + 0LL) << 32) | (sec_lsw + 0LL);
+	*nsec = nsec_;
+}
+
+static inline void read_rx_ts(u64* sec, u32* nsec)
+{
+	u32 sec_msw;
+	u32 sec_lsw;
+	u32 nsec_;
+	if(unlikely(sec == NULL || nsec == NULL)) return;
+
+	sec_msw = readl(SEI_EMAC_RX_SOF_TS_SEC_MSW);
+	sec_lsw = readl(SEI_EMAC_RX_SOF_TS_SEC_LSW);
+	nsec_   = readl(SEI_EMAC_RX_SOF_TS_NSEC);
+
+	*sec  = ((sec_msw + 0LL) << 32) | (sec_lsw + 0LL);
+	*nsec = nsec_;
+}
+
+static void sei_emac_set_hw_addr(struct net_device *dev)
+{
+	uint32_t addr_lo = readl(SEI_EMAC_MACL);
+	uint32_t addr_hi = readl(SEI_EMAC_MACH);
+
+	dev->dev_addr[5] = addr_lo & 0xff;
+	dev->dev_addr[4] = addr_lo >> 8;
+	dev->dev_addr[3] = addr_lo >> 16;
+	dev->dev_addr[2] = addr_lo >> 24;
+	dev->dev_addr[1] = addr_hi & 0xff;
+	dev->dev_addr[0] = addr_hi >> 8;
+}
+
+static int sei_emac_set_mac_address(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+	uint32_t addr_lo = 0;
+	uint32_t addr_hi = 0;
+
+	if (netif_running(dev))
+		return -EBUSY;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+	addr_lo |= (dev->dev_addr[5] | (dev->dev_addr[4] << 8) |
+		    (dev->dev_addr[3] << 16) | (dev->dev_addr[2] << 24));
+	addr_hi |= (dev->dev_addr[1] | (dev->dev_addr[0] << 8));
+
+	writel(addr_lo, SEI_EMAC_MACL);
+	writel(addr_hi, SEI_EMAC_MACH);
+
+	return 0;
+}
+
+static inline void sei_emac_configure(const struct sei_emac_private* seip)
+{
+	uint32_t ctrl;
+	if(seip == NULL) return;
+
+	ctrl = readl(SEI_EMAC_CONTROL);
+
+        if(seip->promisc)
+		ctrl |= SEI_EMAC_PROMISC;
+	else 
+		ctrl &= ~SEI_EMAC_PROMISC;
+
+        if(seip->multicast_all)
+		ctrl |= SEI_EMAC_MCAST;
+	else 
+		ctrl &= ~SEI_EMAC_MCAST;
+
+#ifdef DEBUG
+	printk("%s: %s%sCONTROL=0x%08x\n", __func__, 
+               (seip->promisc? "p ": ""),
+               (seip->multicast_all? "m ": ""),
+               ctrl);
+#endif
+
+	writel(ctrl, SEI_EMAC_CONTROL);
+}
+
+static void sei_emac_set_multicast_list(struct net_device *dev)
+{
+	struct sei_emac_private* seip = netdev_priv(dev);
+        
+        if (dev->flags & IFF_PROMISC)
+                seip->promisc = 1;
+        else
+                seip->promisc = 0;
+
+        if (dev->flags & IFF_ALLMULTI)
+                seip->multicast_all = 1;
+        else if (dev->flags & IFF_MULTICAST) {
+		if(netdev_mc_count(dev) > SEI_EMAC_MAX_MULTICAST_ADDRS)
+                	seip->multicast_all = 1;
+		else {
+			int ha_count = 0;
+			struct netdev_hw_addr* ha = NULL;
+
+			netdev_for_each_mc_addr(ha, dev) {
+				int k = -1;
+				u8* addr = ha->addr;
+				const u32 addr32 = addr[0]<<24 | addr[1]<<16 | addr[2] << 8;
+				for(k = 0; k < ha_count; k++) {
+					if(*sei_emac_hw_mcast_list[k] == addr32) goto skip;
+				}
+				Dprintk(KERN_INFO "SEI EMAC: mcast MAC at %d is %08x\n", ha_count, addr32);
+				*sei_emac_hw_mcast_list[ha_count++] = addr32;
+				continue;
+			   skip:
+				Dprintk(KERN_INFO "SEI EMAC: mcast MAC %08x is programmed, skipping.\n", addr32);
+			}
+
+                	seip->multicast_all = 0;
+		}
+        } else    
+                seip->multicast_all = 0;
+                
+	Stats.multicast_all = seip->multicast_all;
+
+        sei_emac_configure(seip);
+}               
+
+static inline void sei_wait_until_ready(struct net_device *dev)
+{
+	while (readl(SEI_EMAC_STATUS) & SEI_EMAC_BUSY)
+		asm("nop; nop");
+}
+
+static inline void sei_emac_stop(struct net_device *dev)
+{
+	sei_wait_until_ready(dev);
+	writel(SEI_EMAC_RESET, SEI_EMAC_BASE);
+}
+
+static inline void sei_emac_start(struct net_device *dev)
+{
+	volatile uint32_t ctrl = readl(SEI_EMAC_CONTROL);
+
+	//ctrl |= (SEI_EMAC_ENABLE_RX | SEI_EMAC_ENABLE_INT_RX | SEI_EMAC_READ);
+
+	ctrl |= (SEI_EMAC_ENABLE_RX | SEI_EMAC_ENABLE_INT_RX | SEI_EMAC_ENABLE_INT_TX | SEI_EMAC_READ);
+	ctrl &= ~(SEI_EMAC_XMIT);
+	
+	writel(ctrl, SEI_EMAC_CONTROL);
+}
+
+static void sei_emac_restart(struct net_device *dev)
+{
+	sei_emac_stop(dev);
+	udelay(10);
+	sei_emac_start(dev);
+}
+
+static void sei_emac_timeout(struct net_device *dev)
+{
+	dev->stats.tx_errors++;
+	sei_emac_restart(dev);
+	netif_wake_queue(dev);
+}
+
+
+static inline int sei_emac_can_ts_tx(const u8 msg_type)
+{
+	switch(msg_type) {
+	  case SIGNALING:
+	  case MANAGEMENT:
+	  //case DELAY_REQ:
+	  //case PDELAY_REQ:
+		return 0;
+	  default:
+		break;
+	}
+
+	return 1;
+}
+
+static inline const char* type_ts(const u8 msg_type)
+{
+	switch(msg_type) {
+	  case SYNC:                  return "SYNC"; break;
+	  case DELAY_REQ:             return "DELAY_REQ"; break;
+	  case PDELAY_REQ:            return "PDELAY_REQ"; break;
+	  case PDELAY_RESP:           return "PDELAY_RESP"; break;
+	  case FOLLOW_UP:             return "FOLLOW_UP"; break;
+	  case DELAY_RESP:            return "DELAY_RESP"; break;
+	  case PDELAY_RESP_FOLLOW_UP: return "PDELAY_RESP_FOLLOW_UP"; break;
+	  case ANNOUNCE:              return "ANNOUNCE"; break;
+	  case SIGNALING:             return "SIGNALING"; break;
+	  case MANAGEMENT:            return "MANAGEMENT"; break;
+	  default:
+		break;
+	}
+
+	return "???";
+}
+
+static inline int sei_emac_ptp_ver(const u8* ptp_hdr)
+{
+	return ptp_hdr[1] & 0x0F;
+}
+static inline int sei_emac_ptpv2_type(const u8* ptp_hdr)
+{
+	return ptp_hdr[0] & 0x0F;
+}
+
+static u32 sei_emac_tx_ts_offset(const struct sk_buff* skb)
+{
+	u16 l2proto  = 0;
+        u8  ptp_ver  = 0;
+        u8  ptp_type = -1;
+        u16 ptp_port = 0;
+
+	u32 fpga_off = 0;
+
+	if(skb == NULL) return 0;
+
+	if(! (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) return 0;
+
+	do {
+	  struct sock* sk;
+          u8* skb_data;
+	  if(!skb) continue;
+	  if(!skb->sk) continue;
+
+	  sk = skb->sk;
+          skb_data = skb->data;
+
+	  l2proto = ((struct ethhdr*)skb_data)->h_proto;
+	  AFprintkTX("%s: L2 proto = 0x%x\n", __func__, l2proto);
+	  if(l2proto == htons(ETH_P_1588)) {
+	    const u8* ptp_hdr = skb_data + sizeof(struct ethhdr);
+            ptp_ver = sei_emac_ptp_ver(ptp_hdr);
+
+            fpga_off = sizeof(struct ethhdr);
+            fpga_off += (ptp_ver == 2)? PTP_TS_OFFSET_V2: PTP_TS_OFFSET_V1;
+
+            if(ptp_ver == 2) {
+              ptp_type = sei_emac_ptpv2_type(ptp_hdr);
+	      AFprintkTX("%s: PTP %s\n", __func__, type_ts(ptp_type));
+	      if(! sei_emac_can_ts_tx(ptp_type))
+                fpga_off = 0;
+            }
+
+            continue;
+          }
+
+	  AFprintkTX("%s: proto = %d\n", __func__, sk->sk_protocol);
+	  if(sk->sk_protocol != IPPROTO_UDP) continue;
+
+	  AFprintkTX("%s: af = %d\n", __func__, sk->sk_family);
+	  if(sk->sk_family == AF_INET) { // UDPv4
+            struct udphdr* udph = (struct udphdr*)(skb_data + sizeof(struct ethhdr) + sizeof(struct iphdr));
+	    u8* ptp_hdr;
+	    AFprintkTX("%s: dport = %d\n", __func__, ntohs(udph->dest));
+
+            ptp_port = ntohs(udph->dest);
+            if(ptp_port != PTP_EVENT_PORT &&
+               ptp_port != PTP_GENERAL_PORT) continue;
+
+	    ptp_hdr = (u8*)udph + sizeof(struct udphdr);
+            ptp_ver = sei_emac_ptp_ver(ptp_hdr);
+
+	    fpga_off = sizeof(struct ethhdr);
+            fpga_off += sizeof(struct iphdr) + sizeof(struct udphdr);
+            fpga_off += (ptp_ver == 2)? PTP_TS_OFFSET_V2: PTP_TS_OFFSET_V1;
+
+            if(ptp_ver == 2) {
+              ptp_type = sei_emac_ptpv2_type(ptp_hdr);
+	      AFprintkTX("%s: PTP %s\n", __func__, type_ts(ptp_type));
+	      if(! sei_emac_can_ts_tx(ptp_type))
+                fpga_off = 0;
+            }
+
+	    continue;
+	  }
+
+	  if(sk->sk_family == AF_INET6) { // UDPv6
+	    struct udphdr* udph = (struct udphdr*)(skb_data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr));
+	    u8* ptp_hdr;
+	    AFprintkTX("%s: dport = %d\n", __func__, ntohs(udph->dest));
+
+            ptp_port = ntohs(udph->dest);
+            if(ptp_port != PTP_EVENT_PORT &&
+               ptp_port != PTP_GENERAL_PORT) continue;
+
+	    ptp_hdr = (u8*)udph + sizeof(struct udphdr);
+            ptp_ver = sei_emac_ptp_ver(ptp_hdr);
+
+	    fpga_off = sizeof(struct ethhdr);
+	    fpga_off += sizeof(struct ipv6hdr) + sizeof(struct udphdr);
+            fpga_off += (ptp_ver == 2)? PTP_TS_OFFSET_V2: PTP_TS_OFFSET_V1;
+
+            if(ptp_ver == 2) {
+              ptp_type = sei_emac_ptpv2_type(ptp_hdr);
+	      AFprintkTX("%s: PTP %s\n", __func__, type_ts(ptp_type));
+	      if(! sei_emac_can_ts_tx(ptp_type))
+                fpga_off = 0;
+            }
+
+	    continue;
+	  }
+	} while(0);
+
+	AFprintkTX("%s: l2proto 0x%x PTPv%d port %d type %s fpga_off = %d\n", __func__,
+                 l2proto, ptp_ver, ptp_port, type_ts(ptp_type),
+                 fpga_off);
+	return fpga_off;
+}
+
+static u32 sei_emac_rx_is_ptp(const struct sk_buff* skb)
+{
+	u32 ts_off   = 0;
+        u8  ptp_ver  = 0;
+        u8  ptp_type = -1;
+        u16 ptp_port = 0;
+	u8  udp_ver  = 0;
+	u16 l2proto;
+	u8 IP_ver;
+	u8* ptp_hdr;
+
+	if(skb == NULL) return 0;
+
+	l2proto = skb->protocol;
+	if(l2proto == htons(ETH_P_1588)) {
+	    const u8* ptp_hdr = skb->data;
+            ptp_ver = sei_emac_ptp_ver(ptp_hdr);
+
+            ts_off = (ptp_ver == 2)? PTP_TS_OFFSET_V2: PTP_TS_OFFSET_V1;
+	    goto done_ptp;
+	}
+
+	if(l2proto != htons(ETH_P_IP) && l2proto != htons(ETH_P_IPV6)) goto done_notptp;
+
+	IP_ver = ((u8*)skb->data)[0] >> 4;
+	if(IP_ver != 4 && IP_ver != 6) goto done_notptp;
+
+	udp_ver = IP_ver;
+        if(IP_ver == 4) { // UDPv4
+		struct udphdr* udph = (struct udphdr*)(skb->data + sizeof(struct iphdr));
+		ptp_port = ntohs(udph->dest);
+	} else { // UDPv6
+		struct udphdr* udph = (struct udphdr*)(skb->data + sizeof(struct ipv6hdr));
+		ptp_port = ntohs(udph->dest);
+	}
+
+        if(ptp_port != PTP_EVENT_PORT &&
+           ptp_port != PTP_GENERAL_PORT) goto done_notptp;
+
+	ptp_hdr = skb->data;
+        ptp_hdr += (IP_ver == 4)? sizeof(struct iphdr): sizeof(struct ipv6hdr);
+	ptp_hdr += sizeof(struct udphdr);
+
+	ptp_ver = sei_emac_ptp_ver(ptp_hdr);
+
+	ts_off = (IP_ver == 4)? sizeof(struct iphdr): sizeof(struct ipv6hdr);
+        ts_off += sizeof(struct udphdr);
+
+	if(ptp_ver == 1) {
+	      ts_off += PTP_TS_OFFSET_V1;
+	} else if(ptp_ver == 2) {
+	      ts_off += PTP_TS_OFFSET_V2;
+              ptp_type = sei_emac_ptpv2_type(ptp_hdr);
+	} else { ts_off = 0; }
+
+ done_ptp:
+	if(ptp_type >= 0 && ptp_type <= MANAGEMENT)
+		Stats.ptp_rx_stats[ptp_type]++;
+	AFprintkRX("%s: l2proto 0x%x PTPv%d UDPv%d port %d type %s ts_off = %d\n", __func__,
+                 l2proto, ptp_ver, udp_ver, ptp_port, type_ts(ptp_type),
+                 ts_off);
+	return ts_off;
+
+ done_notptp:
+	return 0;
+}
+
+static int sei_emac_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct sei_emac_private *seip = netdev_priv(dev);
+	unsigned long flags;
+	bool isHwTS;
+	bool isHwTX;
+
+	if (!seip->opened)
+		return NETDEV_TX_BUSY;
+
+	if (readl(SEI_EMAC_STATUS) & SEI_EMAC_BUSY)
+		sei_wait_until_ready(dev);
+
+	spin_lock_irqsave(&seip->tx_lock, flags);
+
+#ifdef DEBUG_TX
+	AFprintkTXP("Sending length=%u bytes\n", skb->len);
+	if (1) {
+		uint8_t *buf = (uint8_t *)skb->data;
+		uint8_t *buf_end = buf + skb->len;
+		int i = 0;
+		while (buf < buf_end) {
+			for (i = 0 ; (i < 8) && (buf < buf_end); i++) {
+				AFprintkTXP("%02X ", *(buf++));
+			}
+			AFprintkTXP("\n");
+		}
+		AFprintkTXP("CRC:");
+		for (i = 0 ; i < 4; i++) {
+			AFprintkTXP(" %02X", *(buf++));
+		}
+		AFprintkTXP("\n");
+	}
+#endif
+	memcpy((void *)SEI_EMAC_TX_BUF, skb->data, skb->len);
+	if (skb->len < 60)
+		writel(60, SEI_EMAC_TX_LEN);
+	else 
+		writel(skb->len, SEI_EMAC_TX_LEN);
+
+	isHwTS = FALSE;
+	if(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
+		Stats.tx_pkt_ts_mark++;
+		isHwTS = TRUE;
+	}
+	Dprintk("%s: seip->stamp_cfg.tx_type = %d\n", __func__, seip->stamp_cfg.tx_type);
+	isHwTX = seip->stamp_cfg.tx_type == HWTSTAMP_TX_ON;
+	if(isHwTX && isHwTS) {
+		u32 fpga_off = sei_emac_tx_ts_offset(skb);
+
+		if(fpga_off > 14) { // gt L2 len
+			skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
+			seip->tx_ts_off = fpga_off; // before it's clobbered
+
+			// HACK: FPGA-assist reversed ;)
+	  		if(skb->sk->sk_protocol == IPPROTO_UDP) {
+				fpga_off |= 1L << 31; // indicate to FPGA this is UDP and needs checksum update
+				if(skb->sk->sk_family == AF_INET6) 
+					fpga_off |= 1L << 30; // indicate to FPGA this is UDP/IPv6
+			}
+
+			///printk("SEI_EMAC_TS_OFFSET := 0x%08x\n", fpga_off);
+
+			writel(fpga_off, SEI_EMAC_TS_OFFSET);
+
+			Stats.tx_pkt_ts++;
+
+			seip->tx_skb    = skb; // store SKB for later: do HW ts in ISR
+			seip->tx        = 1;
+		} else {
+			Stats.tx_pkt_inval_off++;
+		}
+	} else {
+		seip->tx        = 0;
+		seip->tx_ts_off = 0;
+		seip->tx_skb    = NULL;
+	}
+
+	// do TX
+	writel((readl(SEI_EMAC_STATUS) | SEI_EMAC_ENABLE_TX), SEI_EMAC_CONTROL);
+
+	Stats.tx_pkt++;
+
+	spin_unlock_irqrestore(&seip->tx_lock, flags);
+
+	dev->trans_start = jiffies;
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+	dev_kfree_skb(skb);
+
+	return NETDEV_TX_OK;
+}
+
+static void sei_emac_systim_to_hwtstamp(struct sei_emac_private* seip,
+                                        struct skb_shared_hwtstamps* shhwtstamps,
+					u64 regval)
+{
+	u64 ns;
+	if(seip == NULL || shhwtstamps == NULL) return;
+
+        ns = timecounter_cyc2time(&seip->clock, regval);
+
+        memset(shhwtstamps, 0, sizeof(struct skb_shared_hwtstamps));
+        shhwtstamps->hwtstamp = ns_to_ktime(ns);
+}
+
+/** \brief Refills the RX ring of buffers
+ * \note Called from locked context
+ */
+static int sei_emac_refill_rx_ring(struct net_device *dev)
+{
+	struct sei_emac_private* seip;
+	int i;
+	int refill_count = 0;
+
+	if(dev == NULL) return -EINVAL;
+	seip = netdev_priv(dev);
+
+	for(i = 0; i < MAX_RX_RING_SZ; i++) {
+		struct sk_buff* skb;
+		if(seip->rx_ring[i] != NULL) continue;
+
+		skb = netdev_alloc_skb(dev, 1600 + NET_IP_ALIGN);
+		if(skb == NULL) {
+			panic("SEI EMAC: Cannot fill RX ring!\n");
+			return -ENOMEM;
+		}
+
+                skb_reserve(skb, NET_IP_ALIGN);
+		seip->rx_ring[i] = skb;
+		refill_count++;
+	}
+
+	if(refill_count) {
+		Stats.rx_refill++;
+		Stats.rx_refill_sz[refill_count - 1]++;
+		seip->refill_warning = 0;
+	}
+
+	return refill_count;
+}
+
+/** \brief Detaches one SKB from RX ring
+ * \note Called from locked context
+ */
+static struct sk_buff* sei_emac_pop_rx_ring(const struct net_device *dev)
+{
+	struct sei_emac_private* seip;
+	int i;
+	struct sk_buff* skb;
+
+	if(dev == NULL) return NULL;
+	seip = netdev_priv(dev);
+
+	for(i = 0; i < MAX_RX_RING_SZ; i++) {
+		if(seip->rx_ring[i] == NULL) continue;
+
+		skb = seip->rx_ring[i];
+		seip->rx_ring[i] = NULL;
+		return skb;
+	}
+
+	return NULL;
+}
+
+static inline int sei_emac_poll_tx(struct sei_emac_private* seip, int budget)
+{
+	int work_done = 0;
+	if(seip == NULL) return 0;
+	ASSERT(seip->sig != 0xdeadbeefL);
+
+	do {
+		tx_item_t tx;
+		int i;
+		unsigned long flags;
+		u64 regval;
+		struct skb_shared_hwtstamps shhwtstamps;
+		memset(&tx, 0, sizeof(tx));
+
+		spin_lock_irqsave(&seip->tx_lock, flags);
+		for(i = MAX_TX_ITEMS - 1; i >= 0; i--) {
+			if(seip->tx_items[i].skb != NULL) {
+				memcpy(&tx, &seip->tx_items[i], sizeof(tx_item_t));
+				memset(&seip->tx_items[i], 0, sizeof(tx_item_t));
+				break;
+			}
+		}
+		spin_unlock_irqrestore(&seip->tx_lock, flags);
+
+		if(tx.skb == NULL) break;
+
+		Dprintk("TX offs %u HW ts %llu.%u (0x%llx/0x%08x)\n",
+		       tx.tx_ts_off,
+		       tx.sec, tx.nsec,
+		       tx.sec, tx.nsec);
+
+		if(tx.tx_ts_off > 0 && tx.sec == 0 && tx.nsec == 0) 
+			Stats.tx_pkt_inval_ts++;
+
+		regval = tx.sec*1000000000LL + tx.nsec;
+
+		sei_emac_systim_to_hwtstamp(seip, &shhwtstamps, regval);
+
+		skb_tstamp_tx(tx.skb, &shhwtstamps);
+
+		work_done++;
+	} while(work_done < budget);
+
+	return work_done;
+}
+
+static inline int sei_emac_poll_rx(struct sei_emac_private* seip, int budget)
+{
+	int work_done = 0;
+	if(seip == NULL) return 0;
+	ASSERT(seip->sig != 0xdeadbeefL);
+
+	do {
+		rx_item_t rx;
+		int i;
+		unsigned long flags;
+		u32 ts_off;
+		u64 regval;
+		memset(&rx, 0, sizeof(rx));
+
+		spin_lock_irqsave(&seip->rx_lock, flags);
+		for(i = MAX_RX_ITEMS - 1; i >= 0; i--) {
+			if(seip->rx_items[i].skb != NULL) {
+				memcpy(&rx, &seip->rx_items[i], sizeof(rx_item_t));
+				memset(&seip->rx_items[i], 0, sizeof(rx_item_t));
+				break;
+			}
+		}
+		spin_unlock_irqrestore(&seip->rx_lock, flags);
+
+		if(rx.skb == NULL) break;
+
+		ts_off = sei_emac_rx_is_ptp(rx.skb); // do pkt parsing and find if is PTP
+
+		if(!sei_emac_hwtstamp_is_none(seip->stamp_cfg.rx_filter) &&
+		   rx.sec > 0 && ts_off > 0) {
+			Dprintk("RX fltr 0x%x off %u %llu.%us\n", seip->stamp_cfg.rx_filter, ts_off, rx.sec, (unsigned int)rx.nsec);
+
+			regval = rx.sec*1000000000LL + rx.nsec;
+			sei_emac_systim_to_hwtstamp(seip, skb_hwtstamps(rx.skb), regval);
+		}
+
+		netif_rx(rx.skb);
+
+		work_done++;
+	} while(work_done < budget);
+
+	return work_done;
+}
+
+static int sei_emac_poll(struct napi_struct* napi, int budget)
+{
+	struct sei_emac_private* seip = container_of(napi, struct sei_emac_private, napi);
+	unsigned int work_done = 0;
+	unsigned long flags;
+
+	ASSERT(seip->sig != 0xdeadbeefL);
+
+	work_done += sei_emac_poll_rx(seip, budget/2);
+	work_done += sei_emac_poll_tx(seip, budget/2);
+
+	spin_lock_irqsave(&seip->rx_lock, flags);
+	sei_emac_refill_rx_ring(seip->dev);
+	spin_unlock_irqrestore(&seip->rx_lock, flags);
+
+	napi_complete(napi);
+
+        return work_done;
+}
+
+static void sei_emac_refill_work(struct work_struct* work)
+{
+        struct sei_emac_private* seip =
+                container_of(work, struct sei_emac_private, refill_work);
+	unsigned long flags;
+	int cnt;
+
+	ASSERT(seip->sig != 0xdeadbeefL);
+
+	spin_lock_irqsave(&seip->rx_lock, flags);
+	cnt = sei_emac_refill_rx_ring(seip->dev);
+	spin_unlock_irqrestore(&seip->rx_lock, flags);
+
+	printk("SEI EMAC rx ring refill kicked by ISR, added %d skb(s)\n", cnt);
+}
+
+static inline void sei_emac_interrupt_tx(struct sei_emac_private* seip) // this is an ISR
+{
+	tx_item_t* tx = NULL;
+	if(seip == NULL) return;
+
+	ASSERT(seip->sig != 0xdeadbeefL);
+
+	//unsigned long flags;
+	//spin_lock_irqsave(&seip->tx_lock, flags);
+
+	if(seip->tx != 0 && seip->tx_skb != NULL) {
+		u64 sec  = 0;
+		u32 nsec = 0;
+		int i;
+		read_tx_ts(&sec, &nsec);
+		Dprintk("TXi %llu.%us\n", sec, (unsigned int)nsec);
+
+		Stats.tx_irq++;
+
+		for(i = 0; i < MAX_TX_ITEMS; i++) {
+			if(seip->tx_items[i].skb == NULL) { tx = &seip->tx_items[i]; break; }
+		}
+		if(tx == NULL) {
+			Stats.tx_full++;
+			printk(KERN_ERR "%s: no empty slots in tx_items! (%d)\n", __func__, Stats.tx_full);
+		} else {
+			tx->skb       = seip->tx_skb;
+			tx->tx_ts_off = seip->tx_ts_off;
+			tx->sec       = sec;
+			tx->nsec      = nsec;
+		}
+
+		seip->tx        = 0;
+		seip->tx_skb    = NULL;
+		seip->tx_ts_off = 0;
+	}
+
+	//spin_unlock_irqrestore(&seip->tx_lock, flags);
+
+	if(tx == NULL) return;
+
+	if (likely(napi_schedule_prep(&seip->napi))) // not in locked context
+		__napi_schedule(&seip->napi);
+}
+
+static irqreturn_t sei_emac_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct sei_emac_private *seip = netdev_priv(dev);
+	uint32_t status;
+	int rx_count;
+	uint32_t pkt_len;
+	struct sk_buff* skb;
+	//unsigned long flags;
+
+	Stats.all_irq++;
+
+	status = readl(SEI_EMAC_STATUS);
+
+        AFprintkISR("isr status 0x%08x debug 0x%08x\n", status, READ_DEBUG_REG);
+
+	if ((status & SEI_EMAC_BUSY) == 0) // a TX-complete IRQ
+		sei_emac_interrupt_tx(seip);
+
+	for (rx_count = 0;
+             rx_count < SEI_EMAC_PINGPONG_BUFFERS && (status & SEI_EMAC_COMPLETE) != 0;
+             rx_count++) { // a RX IRQ
+		if (status & SEI_EMAC_CRC) {
+			dev->stats.rx_errors++;
+			Stats.rx_err++;
+
+#ifdef DEBUG_ISR
+			/* Log contents of CRC error packet */
+			pkt_len = status >> 16;
+			AFprintkISR("CRC Error pkt length=%u bytes\n", pkt_len);
+			if (0) {
+				uint8_t *buf = (uint8_t *)SEI_EMAC_RX_BUF;
+				uint8_t *buf_end = buf + pkt_len;
+				int i = 0;
+				while (buf < buf_end) {
+					for (i = 0 ; (i < 8) && (buf < buf_end); i++) {
+						AFprintkISR("%02X ", *(buf++));
+					}
+					AFprintkISR("\n");
+				}
+				AFprintkISR("CRC:");
+				for (i = 0 ; i < 4; i++) {
+					AFprintkISR(" %02X", *(buf++));
+				}
+				AFprintkISR("\n");
+			}
+#endif
+
+			goto next; //out;
+		}
+
+		if(rx_count == 0)
+			Stats.rx_irq++;
+
+		Stats.rx_pingpong_stats[rx_count]++;
+
+		pkt_len = status >> 16;
+
+#ifdef DEBUG_ISR
+		//AFprintkISR("Good Pkt  pkt length=%u bytes\n", pkt_len);
+		if (1) {
+			uint8_t *buf = (uint8_t *)SEI_EMAC_RX_BUF;
+			uint8_t *buf_end = buf + pkt_len;
+			int i = 0;
+			AFprintkISR("Good Pkt  pkt length=%u bytes\n", pkt_len);
+			while (buf < buf_end) {
+				for (i = 0 ; (i < 8) && (buf < buf_end); i++) {
+					AFprintkISR("%02X ", *(buf++));
+				}
+				AFprintkISR("\n");
+			}
+			AFprintkISR("CRC:");
+			for (i = 0 ; i < 4; i++) {
+				AFprintkISR(" %02X", *(buf++));
+			}
+			AFprintkISR("\n");
+		}
+#endif
+		skb = NULL; //netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
+
+		//spin_lock_irqsave(&seip->rx_lock, flags);
+		skb = sei_emac_pop_rx_ring(dev);
+		//spin_unlock_irqrestore(&seip->rx_lock, flags);
+
+		if (skb != NULL) {
+			u64 sec  = 0;
+			u32 nsec = 0;
+			rx_item_t* rx = NULL;
+			int i;
+
+			//skb_reserve(skb, NET_IP_ALIGN);
+			memcpy(skb_put(skb, pkt_len), (uint8_t *)SEI_EMAC_RX_BUF, pkt_len);
+			skb->dev = dev;
+			skb->protocol = eth_type_trans(skb, dev);
+
+			if(! sei_emac_hwtstamp_is_none(seip->stamp_cfg.rx_filter)) {
+				read_rx_ts(&sec, &nsec);
+				Dprintk("RXi %llu.%us\n", sec, (unsigned int)nsec);
+			}
+
+			//unsigned long flags;
+			//spin_lock_irqsave(&seip->rx_lock, flags);
+
+			for(i = 0; i < MAX_RX_ITEMS; i++) {
+				if(seip->rx_items[i].skb == NULL) { rx = &seip->rx_items[i]; break; }
+			}
+			if(rx == NULL) {
+				Stats.rx_full++;
+				printk(KERN_ERR "%s: no empty slots in rx_items! (%d)\n", __func__, Stats.rx_full);
+				kfree_skb(skb);
+			} else {
+				Stats.rx_pkt++;
+				rx->skb       = skb;
+				rx->sec       = sec;
+				rx->nsec      = nsec;
+			}
+			//spin_unlock_irqrestore(&seip->rx_lock, flags);
+
+			if(rx != NULL) {
+				dev->stats.rx_packets++;
+				dev->stats.rx_bytes += pkt_len;
+			}
+
+			// must kick BH regardless of value of rx to give it a chance to run
+			if (likely(napi_schedule_prep(&seip->napi))) // not in locked context
+				__napi_schedule(&seip->napi);
+		} else {
+			if(! seip->refill_warning) {
+				seip->refill_warning = 1;
+				printk(KERN_ERR "%s: no skbs in rx_ring! (rx_count = %d)\n", __func__, rx_count);
+			}
+			dev->stats.rx_dropped++;
+
+			// WHOOAA NAPI BH did not get a chance to run!!
+			schedule_work(&seip->refill_work);
+		}
+
+	    next:
+		writel((readl(SEI_EMAC_STATUS) | SEI_EMAC_READ), SEI_EMAC_CONTROL);
+
+		status = readl(SEI_EMAC_STATUS);
+
+		AFprintkISR("followup isr status 0x%08x debug 0x%08x\n", status, READ_DEBUG_REG);
+
+		// RX is slow so we poll here in case we have a TX event
+		if ((status & SEI_EMAC_BUSY) == 0) // a TX-complete IRQ
+			sei_emac_interrupt_tx(seip);
+	} // END for SEI_EMAC_PINGPONG_BUFFERS
+
+//out:
+	return IRQ_HANDLED;
+}
+
+static int sei_emac_open(struct net_device *dev)
+{
+	struct sei_emac_private *seip = netdev_priv(dev);
+	int ha_count;
+	int r;
+
+	seip->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
+	seip->stamp_cfg.tx_type   = HWTSTAMP_TX_OFF;
+	seip->multicast_all = 0;
+	Stats.multicast_all = seip->multicast_all;
+
+	for(ha_count = 0; ha_count < SEI_EMAC_MAX_MULTICAST_ADDRS; ha_count++)
+		*sei_emac_hw_mcast_list[ha_count] = 0;
+
+	r = sei_emac_refill_rx_ring(dev);
+	if(r < 0) return r;
+
+	sei_emac_restart(dev);
+	seip->opened = 1;
+
+	netif_start_queue(dev);
+	napi_enable(&seip->napi);
+	netif_carrier_on(dev);
+
+	return 0;
+}
+
+static int sei_emac_close(struct net_device *dev)
+{
+	struct sei_emac_private *seip = netdev_priv(dev);
+	int ha_count;
+	int i;
+
+	seip->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
+	seip->stamp_cfg.tx_type   = HWTSTAMP_TX_OFF;
+	seip->multicast_all = 0;
+	Stats.multicast_all = seip->multicast_all;
+
+	seip->opened = 0;
+	napi_disable(&seip->napi);
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+
+	for(ha_count = 0; ha_count < SEI_EMAC_MAX_MULTICAST_ADDRS; ha_count++)
+		*sei_emac_hw_mcast_list[ha_count] = 0;
+	sei_emac_stop(dev);
+
+	for(i = 0; i < MAX_RX_RING_SZ; i++) {
+		if(seip->rx_ring[i] == NULL) continue;
+
+		kfree_skb(seip->rx_ring[i]);
+		seip->rx_ring[i] = NULL;
+	}
+
+	return 0;
+}
+
+static int sei_emac_hwtstamp_ioctl(struct net_device* dev, struct ifreq* ifr, int cmd)
+{
+	struct sei_emac_private* seip = netdev_priv(dev);
+
+        struct hwtstamp_config config;
+        if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+                return -EFAULT;
+
+        pr_debug("%s config flag:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
+                        __func__, config.flags, config.tx_type, config.rx_filter);
+
+        /* reserved for future extensions */
+        if (config.flags)
+                return -EINVAL;
+
+        if ((config.tx_type != HWTSTAMP_TX_OFF) &&
+                        (config.tx_type != HWTSTAMP_TX_ON))
+                return -ERANGE;
+
+        switch (config.rx_filter) {
+          case HWTSTAMP_FILTER_NONE: // Dont allow any timestamping
+                //config.rx_filter = HWTSTAMP_FILTER_NONE;
+                break;
+          case HWTSTAMP_FILTER_ALL: // Dont allow any timestamping
+                //config.rx_filter = HWTSTAMP_FILTER_ALL;
+                break;
+          case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:     // PTP v1, UDP, any kind of event packet
+          case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:      // PTP v1, UDP, Sync packet
+          case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: // PTP v1, UDP, Delay_req packet
+                config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
+                break;
+          case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:     // PTP v2, UDP, any kind of event packet
+          case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:      // PTP v2, UDP, Sync packet
+          case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: // PTP v2, UDP, Delay_req packet
+                config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
+                break;
+          case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:     // 802.AS1, Ethernet, any kind of event packet
+          case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:      // 802.AS1, Ethernet, Sync packet
+          case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: // 802.AS1, Ethernet, Delay_req packet
+                config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
+                break;
+	  case HWTSTAMP_FILTER_PTP_V2_EVENT:        // PTP v2/802.AS1, any layer, any kind of event packet
+	  case HWTSTAMP_FILTER_PTP_V2_SYNC:         // PTP v2/802.AS1, any layer, Sync packet
+	  case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:    // PTP v2/802.AS1, any layer, Delay_req packet
+                config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+                break;
+          default:
+		printk("%s config.rx_filter = %d invalid\n", __func__, config.rx_filter);
+                return -ERANGE;
+        }
+
+        if (config.tx_type == HWTSTAMP_TX_OFF && sei_emac_hwtstamp_is_none(config.rx_filter)) {
+		// disable in HW
+        } else {
+		// enable in HW
+
+                timecounter_init(&seip->clock,
+                                &seip->cycles,
+                                ktime_to_ns(ktime_get_real()));
+        }
+
+        seip->stamp_cfg = config;
+
+	Dprintk("%s: tx_type %d rx_filter %d\n", __func__, seip->stamp_cfg.tx_type, seip->stamp_cfg.rx_filter);
+
+        return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+                -EFAULT : 0;
+}
+
+static int sei_emac_ioctl(struct net_device* dev, struct ifreq* ifr, int cmd)
+{
+	///struct sei_emac_private* seip = netdev_priv(dev);
+
+	if(!netif_running(dev)) return -EINVAL;
+
+	switch(cmd) {
+	  case SIOCSHWTSTAMP:
+		return sei_emac_hwtstamp_ioctl(dev, ifr, cmd);
+		break;
+	  default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int sei_emac_proc_show(struct seq_file* m, void* v)
+{
+	int i;
+	int ha_count;
+
+	seq_printf(m, "MCAST ALL=%d\n", Stats.multicast_all);
+
+        for(ha_count = 0; ha_count < SEI_EMAC_MAX_MULTICAST_ADDRS; ha_count++) {
+		const u32 addr32 = *sei_emac_hw_mcast_list[ha_count];
+		seq_printf(m, "MCAST[%d]=%08x\n", ha_count, addr32);
+	}
+
+	if(Stats.seip != NULL) {
+		seq_printf(m, "HW Accel TX type: 0x%x RX filter: 0x%x\n",
+			   Stats.seip->stamp_cfg.tx_type,
+			   Stats.seip->stamp_cfg.rx_filter);
+	}
+        seq_printf(m, "TX pkt: %u pkt+ts2hw: %u mark: %u invaloff: %u invalts: %u irq:%u\n" \
+		      "RX pkt: %u irq:%u err:%u\n", 
+		   Stats.tx_pkt, Stats.tx_pkt_ts, Stats.tx_pkt_ts_mark, Stats.tx_pkt_inval_off, Stats.tx_pkt_inval_ts, Stats.tx_irq, 
+		   Stats.rx_pkt, Stats.rx_irq, Stats.rx_err
+		   );
+        seq_printf(m, "RX pingpong ( ");
+	for(i = 0; i < SEI_EMAC_PINGPONG_BUFFERS; i++)
+        	seq_printf(m, "%u ", Stats.rx_pingpong_stats[i]);
+	seq_printf(m, ")\n");
+
+        seq_printf(m, "RX refill: %u SZ=( ", Stats.rx_refill);
+	for(i = 0; i < MAX_RX_RING_SZ; i++)
+        	seq_printf(m, "%u ", Stats.rx_refill_sz[i]);
+	seq_printf(m, ")\n");
+	for(i = 0; i < PTP_MSG_TYPE_SZ; i++) {
+		const int msgType = ptp_msg_types[i];
+		const u32 cnt = Stats.ptp_rx_stats[msgType];
+		if(cnt == 0) continue;
+        	seq_printf(m, "RX/PTP %s: %u\n", type_ts(msgType), cnt);
+	}
+
+        return 0;
+}
+
+static int sei_emac_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, sei_emac_proc_show, NULL);
+}
+
+static const struct file_operations emac_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = sei_emac_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static const struct net_device_ops sei_emac_netdev_ops = {
+	.ndo_open            = sei_emac_open,
+	.ndo_stop            = sei_emac_close,
+	.ndo_start_xmit      = sei_emac_start_xmit,
+	.ndo_tx_timeout      = sei_emac_timeout,
+        .ndo_set_rx_mode     = sei_emac_set_multicast_list,
+	.ndo_set_mac_address = sei_emac_set_mac_address,
+	.ndo_do_ioctl        = sei_emac_ioctl,
+};
+
+static int sei_emac_hw_init(struct net_device *dev, int index)
+{
+	dev->watchdog_timeo = TX_TIMEOUT;
+	dev->netdev_ops = &sei_emac_netdev_ops;
+	sei_emac_set_hw_addr(dev);
+	//sei_emac_restart(dev);
+
+	return 0;
+}
+
+/**
+ * emac_read_clock - read raw cycle counter (to be used by time counter)
+ */
+static cycle_t sei_emac_read_clock(const struct cyclecounter *tc)
+{
+	// struct sei_emac_private* seip = container_of(tc, struct sei_emac_private, cycles);
+
+	u64 sec  = 0;
+	u32 nsec = 0;
+	u64 stamp;
+	read_ts(&sec, &nsec);
+
+	///printk("CLK %llu.%us\n", sec, (unsigned int)nsec);
+
+	stamp = sec*1000000000LL + nsec;
+
+        return stamp;
+}
+
+/**
+ * emac_init_hw_timer - Initialize hardware timer used with IEEE 1588 timestamp
+ */
+static void sei_emac_init_hw_timer(struct sei_emac_private* seip)
+{
+	if(seip == NULL) return;
+
+	memset(&seip->cycles, 0, sizeof(seip->cycles));
+	seip->cycles.read = sei_emac_read_clock;
+	seip->cycles.mask = CLOCKSOURCE_MASK(64);
+
+	seip->cycles.mult  = 1; // XXX
+	seip->cycles.shift = 0; //XXX
+
+	timecounter_init(&seip->clock,
+			 &seip->cycles,
+			 ktime_to_ns(ktime_get_real()));
+
+        /* Initialize hwstamp config */
+        seip->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
+        seip->stamp_cfg.tx_type   = HWTSTAMP_TX_OFF;
+}
+
+static int sei_emac_probe(struct platform_device *pdev)
+{
+	struct sei_emac_private *seip;
+	struct net_device *dev;
+	int irq, ret = 0;
+	struct resource *r;
+
+	memset(&Stats, 0, sizeof(Stats));
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -ENXIO;
+
+	r = request_mem_region(r->start, resource_size(r), pdev->name);
+	if (!r)
+		return -EBUSY;
+
+	/* Init network device */
+	dev = alloc_etherdev(sizeof(struct sei_emac_private));
+	if (!dev)
+		return -ENOMEM;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	/* setup board info structure */
+	seip = netdev_priv(dev);
+	memset(seip, 0, sizeof(*seip));
+
+	seip->sig = 0xdeadbeefL;
+	seip->dev = dev;
+
+	INIT_WORK(&seip->refill_work, sei_emac_refill_work);
+	spin_lock_init(&seip->rx_lock);
+	spin_lock_init(&seip->tx_lock);
+
+	netif_napi_add(dev, &seip->napi, sei_emac_poll, SEI_EMAC_NAPI_WEIGHT);
+
+	seip->tx = 0;
+
+	dev->base_addr = (unsigned long)ioremap(r->start, resource_size(r));
+
+	if (!dev->base_addr) {
+		ret = -ENOMEM;
+		goto failed_ioremap;
+	}
+
+	platform_set_drvdata(pdev, dev);
+
+	sei_emac_init_hw_timer(seip);
+
+	irq = platform_get_irq(pdev, 0);
+
+	ret =
+	    request_irq(irq, sei_emac_interrupt, IRQF_NO_THREAD, pdev->name,
+			dev);
+	if (!ret) {
+		ret = sei_emac_hw_init(dev, 0);
+		if (!ret) {
+			ret = register_netdev(dev);
+			if (!ret) {
+				Stats.seip = seip;
+				proc_create("sei_emac", 0, NULL, &emac_proc_fops);
+				return 0;
+			}
+		}
+	}
+
+	free_irq(irq, dev);
+	iounmap((void __iomem *)dev->base_addr);
+
+failed_ioremap:
+	cancel_work_sync(&seip->refill_work);
+	free_netdev(dev);
+
+	return ret;
+}
+
+static int sei_emac_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+
+	platform_set_drvdata(pdev, NULL);
+
+	sei_emac_stop(ndev);
+	iounmap((void __iomem *)ndev->base_addr);
+	unregister_netdev(ndev);
+	free_netdev(ndev);
+
+	return 0;
+}
+
+static int sei_emac_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+	struct net_device *net_dev = platform_get_drvdata(pdev);
+
+	if (net_dev && netif_running(net_dev))
+		sei_emac_close(net_dev);
+
+	return 0;
+}
+
+static int sei_emac_resume(struct platform_device *pdev)
+{
+	struct net_device *net_dev = platform_get_drvdata(pdev);
+
+	if (net_dev && netif_running(net_dev))
+		sei_emac_open(net_dev);
+
+	return 0;
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id jcore_emac_of_match[] = {
+	{ .compatible = "jcore,emac" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, jcore_emac_of_match);
+
+static struct platform_driver sei_emac_driver = {
+	.driver = {
+		.name = "jcore-emac",
+		.owner = THIS_MODULE,
+		.of_match_table = jcore_emac_of_match,
+	},
+	.probe = sei_emac_probe,
+	.remove = sei_emac_remove,
+	.suspend = sei_emac_suspend,
+	.resume = sei_emac_resume,
+};
+
+static int __init sei_emac_init(void)
+{
+	uint32_t addr_lo = readl(SEI_EMAC_MACL);
+	uint32_t addr_hi = readl(SEI_EMAC_MACH);
+
+	/* Just in case if loader did not setup MAC address */
+	if (!addr_hi) {
+		writel(0x00000001, SEI_EMAC_MACH);
+		addr_hi = readl(SEI_EMAC_MACH);
+	}
+
+	if (!addr_lo) {
+		writel(0x02caca00, SEI_EMAC_MACL);
+		addr_lo = readl(SEI_EMAC_MACL);
+	}
+
+	printk(KERN_INFO "SEI EMAC: MAC is %04x%08x\n", addr_hi, addr_lo);
+
+	return platform_driver_register(&sei_emac_driver);
+}
+
+static void __exit sei_emac_exit(void)
+{
+	platform_driver_unregister(&sei_emac_driver);
+}
+
+module_init(sei_emac_init);
+module_exit(sei_emac_exit);
+
+MODULE_AUTHOR("Oleksandr G Zhadan");
+MODULE_DESCRIPTION("SEI Emac driver");