net: Add TI DaVinci EMAC driver

Add support for TI DaVinci EMAC driver.

TI DaVinci Ethernet Media Access Controller module is based upon
TI CPPI 3.0 DMA engine and supports 10/100 Mbps on all and Gigabit modes on
some TI devices. It supports MII/RMII and has up to 8Kbytes of internal
descriptor memory. This driver has been working on several TI devices including
DM644x, DM646x and DA830 platforms. The specs of this device are available at:
http://www.ti.com/litv/pdf/sprue24a

Signed-off-by: Anant Gole <anantgole@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2832 insertions, 0 deletions

diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
new file mode 100644
index 000000000000..cf689a056b38
--- /dev/null
+++ b/drivers/net/davinci_emac.c
@@ -0,0 +1,2832 @@
+/*
+ * DaVinci Ethernet Medium Access Controller
+ *
+ * DaVinci EMAC is based upon CPPI 3.0 TI DMA engine
+ *
+ * Copyright (C) 2009 Texas Instruments.
+ *
+ * ---------------------------------------------------------------------------
+ *
+ * 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 of the License, 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; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * ---------------------------------------------------------------------------
+ * History:
+ * 0-5 A number of folks worked on this driver in bits and pieces but the major
+ *     contribution came from Suraj Iyer and Anant Gole
+ * 6.0 Anant Gole - rewrote the driver as per Linux conventions
+ * 6.1 Chaithrika U S - added support for Gigabit and RMII features,
+ *     PHY layer usage
+ */
+
+/** Pending Items in this driver:
+ * 1. Use Linux cache infrastcture for DMA'ed memory (dma_xxx functions)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/highmem.h>
+#include <linux/proc_fs.h>
+#include <linux/ctype.h>
+#include <linux/version.h>
+#include <linux/spinlock.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/semaphore.h>
+#include <linux/phy.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <asm/irq.h>
+#include <asm/page.h>
+
+#include <mach/emac.h>
+
+static int debug_level;
+module_param(debug_level, int, 0);
+MODULE_PARM_DESC(debug_level, "DaVinci EMAC debug level (NETIF_MSG bits)");
+
+/* Netif debug messages possible */
+#define DAVINCI_EMAC_DEBUG	(NETIF_MSG_DRV | \
+				NETIF_MSG_PROBE | \
+				NETIF_MSG_LINK | \
+				NETIF_MSG_TIMER | \
+				NETIF_MSG_IFDOWN | \
+				NETIF_MSG_IFUP | \
+				NETIF_MSG_RX_ERR | \
+				NETIF_MSG_TX_ERR | \
+				NETIF_MSG_TX_QUEUED | \
+				NETIF_MSG_INTR | \
+				NETIF_MSG_TX_DONE | \
+				NETIF_MSG_RX_STATUS | \
+				NETIF_MSG_PKTDATA | \
+				NETIF_MSG_HW | \
+				NETIF_MSG_WOL)
+
+/* version info */
+#define EMAC_MAJOR_VERSION	6
+#define EMAC_MINOR_VERSION	1
+#define EMAC_MODULE_VERSION	"6.1"
+MODULE_VERSION(EMAC_MODULE_VERSION);
+static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
+
+/* Configuration items */
+#define EMAC_DEF_PASS_CRC		(0) /* Do not pass CRC upto frames */
+#define EMAC_DEF_QOS_EN			(0) /* EMAC proprietary QoS disabled */
+#define EMAC_DEF_NO_BUFF_CHAIN		(0) /* No buffer chain */
+#define EMAC_DEF_MACCTRL_FRAME_EN	(0) /* Discard Maccontrol frames */
+#define EMAC_DEF_SHORT_FRAME_EN		(0) /* Discard short frames */
+#define EMAC_DEF_ERROR_FRAME_EN		(0) /* Discard error frames */
+#define EMAC_DEF_PROM_EN		(0) /* Promiscous disabled */
+#define EMAC_DEF_PROM_CH		(0) /* Promiscous channel is 0 */
+#define EMAC_DEF_BCAST_EN		(1) /* Broadcast enabled */
+#define EMAC_DEF_BCAST_CH		(0) /* Broadcast channel is 0 */
+#define EMAC_DEF_MCAST_EN		(1) /* Multicast enabled */
+#define EMAC_DEF_MCAST_CH		(0) /* Multicast channel is 0 */
+
+#define EMAC_DEF_TXPRIO_FIXED		(1) /* TX Priority is fixed */
+#define EMAC_DEF_TXPACING_EN		(0) /* TX pacing NOT supported*/
+
+#define EMAC_DEF_BUFFER_OFFSET		(0) /* Buffer offset to DMA (future) */
+#define EMAC_DEF_MIN_ETHPKTSIZE		(60) /* Minimum ethernet pkt size */
+#define EMAC_DEF_MAX_FRAME_SIZE		(1500 + 14 + 4 + 4)
+#define EMAC_DEF_TX_CH			(0) /* Default 0th channel */
+#define EMAC_DEF_RX_CH			(0) /* Default 0th channel */
+#define EMAC_DEF_MDIO_TICK_MS		(10) /* typically 1 tick=1 ms) */
+#define EMAC_DEF_MAX_TX_CH		(1) /* Max TX channels configured */
+#define EMAC_DEF_MAX_RX_CH		(1) /* Max RX channels configured */
+#define EMAC_POLL_WEIGHT		(64) /* Default NAPI poll weight */
+
+/* Buffer descriptor parameters */
+#define EMAC_DEF_TX_MAX_SERVICE		(32) /* TX max service BD's */
+#define EMAC_DEF_RX_MAX_SERVICE		(64) /* should = netdev->weight */
+
+/* EMAC register related defines */
+#define EMAC_ALL_MULTI_REG_VALUE	(0xFFFFFFFF)
+#define EMAC_NUM_MULTICAST_BITS		(64)
+#define EMAC_TEARDOWN_VALUE		(0xFFFFFFFC)
+#define EMAC_TX_CONTROL_TX_ENABLE_VAL	(0x1)
+#define EMAC_RX_CONTROL_RX_ENABLE_VAL	(0x1)
+#define EMAC_MAC_HOST_ERR_INTMASK_VAL	(0x2)
+#define EMAC_RX_UNICAST_CLEAR_ALL	(0xFF)
+#define EMAC_INT_MASK_CLEAR		(0xFF)
+
+/* RX MBP register bit positions */
+#define EMAC_RXMBP_PASSCRC_MASK		BIT(30)
+#define EMAC_RXMBP_QOSEN_MASK		BIT(29)
+#define EMAC_RXMBP_NOCHAIN_MASK		BIT(28)
+#define EMAC_RXMBP_CMFEN_MASK		BIT(24)
+#define EMAC_RXMBP_CSFEN_MASK		BIT(23)
+#define EMAC_RXMBP_CEFEN_MASK		BIT(22)
+#define EMAC_RXMBP_CAFEN_MASK		BIT(21)
+#define EMAC_RXMBP_PROMCH_SHIFT		(16)
+#define EMAC_RXMBP_PROMCH_MASK		(0x7 << 16)
+#define EMAC_RXMBP_BROADEN_MASK		BIT(13)
+#define EMAC_RXMBP_BROADCH_SHIFT	(8)
+#define EMAC_RXMBP_BROADCH_MASK		(0x7 << 8)
+#define EMAC_RXMBP_MULTIEN_MASK		BIT(5)
+#define EMAC_RXMBP_MULTICH_SHIFT	(0)
+#define EMAC_RXMBP_MULTICH_MASK		(0x7)
+#define EMAC_RXMBP_CHMASK		(0x7)
+
+/* EMAC register definitions/bit maps used */
+# define EMAC_MBP_RXPROMISC		(0x00200000)
+# define EMAC_MBP_PROMISCCH(ch)		(((ch) & 0x7) << 16)
+# define EMAC_MBP_RXBCAST		(0x00002000)
+# define EMAC_MBP_BCASTCHAN(ch)		(((ch) & 0x7) << 8)
+# define EMAC_MBP_RXMCAST		(0x00000020)
+# define EMAC_MBP_MCASTCHAN(ch)		((ch) & 0x7)
+
+/* EMAC mac_control register */
+#define EMAC_MACCONTROL_TXPTYPE		(0x200)
+#define EMAC_MACCONTROL_TXPACEEN	(0x40)
+#define EMAC_MACCONTROL_MIIEN		(0x20)
+#define EMAC_MACCONTROL_GIGABITEN	(0x80)
+#define EMAC_MACCONTROL_GIGABITEN_SHIFT (7)
+#define EMAC_MACCONTROL_FULLDUPLEXEN	(0x1)
+#define EMAC_MACCONTROL_RMIISPEED_MASK	BIT(15)
+
+/* GIGABIT MODE related bits */
+#define EMAC_DM646X_MACCONTORL_GMIIEN	BIT(5)
+#define EMAC_DM646X_MACCONTORL_GIG	BIT(7)
+#define EMAC_DM646X_MACCONTORL_GIGFORCE	BIT(17)
+
+/* EMAC mac_status register */
+#define EMAC_MACSTATUS_TXERRCODE_MASK	(0xF00000)
+#define EMAC_MACSTATUS_TXERRCODE_SHIFT	(20)
+#define EMAC_MACSTATUS_TXERRCH_MASK	(0x7)
+#define EMAC_MACSTATUS_TXERRCH_SHIFT	(16)
+#define EMAC_MACSTATUS_RXERRCODE_MASK	(0xF000)
+#define EMAC_MACSTATUS_RXERRCODE_SHIFT	(12)
+#define EMAC_MACSTATUS_RXERRCH_MASK	(0x7)
+#define EMAC_MACSTATUS_RXERRCH_SHIFT	(8)
+
+/* EMAC RX register masks */
+#define EMAC_RX_MAX_LEN_MASK		(0xFFFF)
+#define EMAC_RX_BUFFER_OFFSET_MASK	(0xFFFF)
+
+/* MAC_IN_VECTOR (0x180) register bit fields */
+#define EMAC_DM644X_MAC_IN_VECTOR_HOST_INT	      (0x20000)
+#define EMAC_DM644X_MAC_IN_VECTOR_STATPEND_INT	      (0x10000)
+#define EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC	      (0x0100)
+#define EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC	      (0x01)
+
+/** NOTE:: For DM646x the IN_VECTOR has changed */
+#define EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC	BIT(EMAC_DEF_RX_CH)
+#define EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC	BIT(16 + EMAC_DEF_TX_CH)
+
+/* CPPI bit positions */
+#define EMAC_CPPI_SOP_BIT		BIT(31)
+#define EMAC_CPPI_EOP_BIT		BIT(30)
+#define EMAC_CPPI_OWNERSHIP_BIT		BIT(29)
+#define EMAC_CPPI_EOQ_BIT		BIT(28)
+#define EMAC_CPPI_TEARDOWN_COMPLETE_BIT BIT(27)
+#define EMAC_CPPI_PASS_CRC_BIT		BIT(26)
+#define EMAC_RX_BD_BUF_SIZE		(0xFFFF)
+#define EMAC_BD_LENGTH_FOR_CACHE	(16) /* only CPPI bytes */
+#define EMAC_RX_BD_PKT_LENGTH_MASK	(0xFFFF)
+
+/* Max hardware defines */
+#define EMAC_MAX_TXRX_CHANNELS		 (8)  /* Max hardware channels */
+#define EMAC_DEF_MAX_MULTICAST_ADDRESSES (64) /* Max mcast addr's */
+
+/* EMAC Peripheral Device Register Memory Layout structure */
+#define EMAC_TXIDVER		0x0
+#define EMAC_TXCONTROL		0x4
+#define EMAC_TXTEARDOWN		0x8
+#define EMAC_RXIDVER		0x10
+#define EMAC_RXCONTROL		0x14
+#define EMAC_RXTEARDOWN		0x18
+#define EMAC_TXINTSTATRAW	0x80
+#define EMAC_TXINTSTATMASKED	0x84
+#define EMAC_TXINTMASKSET	0x88
+#define EMAC_TXINTMASKCLEAR	0x8C
+#define EMAC_MACINVECTOR	0x90
+
+#define EMAC_DM646X_MACEOIVECTOR	0x94
+
+#define EMAC_RXINTSTATRAW	0xA0
+#define EMAC_RXINTSTATMASKED	0xA4
+#define EMAC_RXINTMASKSET	0xA8
+#define EMAC_RXINTMASKCLEAR	0xAC
+#define EMAC_MACINTSTATRAW	0xB0
+#define EMAC_MACINTSTATMASKED	0xB4
+#define EMAC_MACINTMASKSET	0xB8
+#define EMAC_MACINTMASKCLEAR	0xBC
+
+#define EMAC_RXMBPENABLE	0x100
+#define EMAC_RXUNICASTSET	0x104
+#define EMAC_RXUNICASTCLEAR	0x108
+#define EMAC_RXMAXLEN		0x10C
+#define EMAC_RXBUFFEROFFSET	0x110
+#define EMAC_RXFILTERLOWTHRESH	0x114
+
+#define EMAC_MACCONTROL		0x160
+#define EMAC_MACSTATUS		0x164
+#define EMAC_EMCONTROL		0x168
+#define EMAC_FIFOCONTROL	0x16C
+#define EMAC_MACCONFIG		0x170
+#define EMAC_SOFTRESET		0x174
+#define EMAC_MACSRCADDRLO	0x1D0
+#define EMAC_MACSRCADDRHI	0x1D4
+#define EMAC_MACHASH1		0x1D8
+#define EMAC_MACHASH2		0x1DC
+#define EMAC_MACADDRLO		0x500
+#define EMAC_MACADDRHI		0x504
+#define EMAC_MACINDEX		0x508
+
+/* EMAC HDP and Completion registors */
+#define EMAC_TXHDP(ch)		(0x600 + (ch * 4))
+#define EMAC_RXHDP(ch)		(0x620 + (ch * 4))
+#define EMAC_TXCP(ch)		(0x640 + (ch * 4))
+#define EMAC_RXCP(ch)		(0x660 + (ch * 4))
+
+/* EMAC statistics registers */
+#define EMAC_RXGOODFRAMES	0x200
+#define EMAC_RXBCASTFRAMES	0x204
+#define EMAC_RXMCASTFRAMES	0x208
+#define EMAC_RXPAUSEFRAMES	0x20C
+#define EMAC_RXCRCERRORS	0x210
+#define EMAC_RXALIGNCODEERRORS	0x214
+#define EMAC_RXOVERSIZED	0x218
+#define EMAC_RXJABBER		0x21C
+#define EMAC_RXUNDERSIZED	0x220
+#define EMAC_RXFRAGMENTS	0x224
+#define EMAC_RXFILTERED		0x228
+#define EMAC_RXQOSFILTERED	0x22C
+#define EMAC_RXOCTETS		0x230
+#define EMAC_TXGOODFRAMES	0x234
+#define EMAC_TXBCASTFRAMES	0x238
+#define EMAC_TXMCASTFRAMES	0x23C
+#define EMAC_TXPAUSEFRAMES	0x240
+#define EMAC_TXDEFERRED		0x244
+#define EMAC_TXCOLLISION	0x248
+#define EMAC_TXSINGLECOLL	0x24C
+#define EMAC_TXMULTICOLL	0x250
+#define EMAC_TXEXCESSIVECOLL	0x254
+#define EMAC_TXLATECOLL		0x258
+#define EMAC_TXUNDERRUN		0x25C
+#define EMAC_TXCARRIERSENSE	0x260
+#define EMAC_TXOCTETS		0x264
+#define EMAC_NETOCTETS		0x280
+#define EMAC_RXSOFOVERRUNS	0x284
+#define EMAC_RXMOFOVERRUNS	0x288
+#define EMAC_RXDMAOVERRUNS	0x28C
+
+/* EMAC DM644x control registers */
+#define EMAC_CTRL_EWCTL		(0x4)
+#define EMAC_CTRL_EWINTTCNT	(0x8)
+
+/* EMAC MDIO related */
+/* Mask & Control defines */
+#define MDIO_CONTROL_CLKDIV	(0xFF)
+#define MDIO_CONTROL_ENABLE	BIT(30)
+#define MDIO_USERACCESS_GO	BIT(31)
+#define MDIO_USERACCESS_WRITE	BIT(30)
+#define MDIO_USERACCESS_READ	(0)
+#define MDIO_USERACCESS_REGADR	(0x1F << 21)
+#define MDIO_USERACCESS_PHYADR	(0x1F << 16)
+#define MDIO_USERACCESS_DATA	(0xFFFF)
+#define MDIO_USERPHYSEL_LINKSEL	BIT(7)
+#define MDIO_VER_MODID		(0xFFFF << 16)
+#define MDIO_VER_REVMAJ		(0xFF   << 8)
+#define MDIO_VER_REVMIN		(0xFF)
+
+#define MDIO_USERACCESS(inst)	(0x80 + (inst * 8))
+#define MDIO_USERPHYSEL(inst)	(0x84 + (inst * 8))
+#define MDIO_CONTROL		(0x04)
+
+/* EMAC DM646X control module registers */
+#define EMAC_DM646X_CMRXINTEN	(0x14)
+#define EMAC_DM646X_CMTXINTEN	(0x18)
+
+/* EMAC EOI codes for C0 */
+#define EMAC_DM646X_MAC_EOI_C0_RXEN	(0x01)
+#define EMAC_DM646X_MAC_EOI_C0_TXEN	(0x02)
+
+/** net_buf_obj: EMAC network bufferdata structure
+ *
+ * EMAC network buffer data structure
+ */
+struct emac_netbufobj {
+	void *buf_token;
+	char *data_ptr;
+	int length;
+};
+
+/** net_pkt_obj: EMAC network packet data structure
+ *
+ * EMAC network packet data structure - supports buffer list (for future)
+ */
+struct emac_netpktobj {
+	void *pkt_token; /* data token may hold tx/rx chan id */
+	struct emac_netbufobj *buf_list; /* array of network buffer objects */
+	int num_bufs;
+	int pkt_length;
+};
+
+/** emac_tx_bd: EMAC TX Buffer descriptor data structure
+ *
+ * EMAC TX Buffer descriptor data structure
+ */
+struct emac_tx_bd {
+	int h_next;
+	int buff_ptr;
+	int off_b_len;
+	int mode; /* SOP, EOP, ownership, EOQ, teardown,Qstarv, length */
+	struct emac_tx_bd __iomem *next;
+	void *buf_token;
+};
+
+/** emac_txch: EMAC TX Channel data structure
+ *
+ * EMAC TX Channel data structure
+ */
+struct emac_txch {
+	/* Config related */
+	u32 num_bd;
+	u32 service_max;
+
+	/* CPPI specific */
+	u32 alloc_size;
+	void __iomem *bd_mem;
+	struct emac_tx_bd __iomem *bd_pool_head;
+	struct emac_tx_bd __iomem *active_queue_head;
+	struct emac_tx_bd __iomem *active_queue_tail;
+	struct emac_tx_bd __iomem *last_hw_bdprocessed;
+	u32 queue_active;
+	u32 teardown_pending;
+	u32 *tx_complete;
+
+	/** statistics */
+	u32 proc_count;     /* TX: # of times emac_tx_bdproc is called */
+	u32 mis_queued_packets;
+	u32 queue_reinit;
+	u32 end_of_queue_add;
+	u32 out_of_tx_bd;
+	u32 no_active_pkts; /* IRQ when there were no packets to process */
+	u32 active_queue_count;
+};
+
+/** emac_rx_bd: EMAC RX Buffer descriptor data structure
+ *
+ * EMAC RX Buffer descriptor data structure
+ */
+struct emac_rx_bd {
+	int h_next;
+	int buff_ptr;
+	int off_b_len;
+	int mode;
+	struct emac_rx_bd __iomem *next;
+	void *data_ptr;
+	void *buf_token;
+};
+
+/** emac_rxch: EMAC RX Channel data structure
+ *
+ * EMAC RX Channel data structure
+ */
+struct emac_rxch {
+	/* configuration info */
+	u32 num_bd;
+	u32 service_max;
+	u32 buf_size;
+	char mac_addr[6];
+
+	/** CPPI specific */
+	u32 alloc_size;
+	void __iomem *bd_mem;
+	struct emac_rx_bd __iomem *bd_pool_head;
+	struct emac_rx_bd __iomem *active_queue_head;
+	struct emac_rx_bd __iomem *active_queue_tail;
+	u32 queue_active;
+	u32 teardown_pending;
+
+	/* packet and buffer objects */
+	struct emac_netpktobj pkt_queue;
+	struct emac_netbufobj buf_queue;
+
+	/** statistics */
+	u32 proc_count; /* number of times emac_rx_bdproc is called */
+	u32 processed_bd;
+	u32 recycled_bd;
+	u32 out_of_rx_bd;
+	u32 out_of_rx_buffers;
+	u32 queue_reinit;
+	u32 end_of_queue_add;
+	u32 end_of_queue;
+	u32 mis_queued_packets;
+};
+
+/* emac_priv: EMAC private data structure
+ *
+ * EMAC adapter private data structure
+ */
+struct emac_priv {
+	u32 msg_enable;
+	struct net_device *ndev;
+	struct platform_device *pdev;
+	struct napi_struct napi;
+	char mac_addr[6];
+	spinlock_t tx_lock;
+	spinlock_t rx_lock;
+	void __iomem *remap_addr;
+	u32 emac_base_phys;
+	void __iomem *emac_base;
+	void __iomem *ctrl_base;
+	void __iomem *emac_ctrl_ram;
+	u32 ctrl_ram_size;
+	struct emac_txch *txch[EMAC_DEF_MAX_TX_CH];
+	struct emac_rxch *rxch[EMAC_DEF_MAX_RX_CH];
+	u32 link; /* 1=link on, 0=link off */
+	u32 speed; /* 0=Auto Neg, 1=No PHY, 10,100, 1000 - mbps */
+	u32 duplex; /* Link duplex: 0=Half, 1=Full */
+	u32 rx_buf_size;
+	u32 isr_count;
+	u8 rmii_en;
+	u8 version;
+	struct net_device_stats net_dev_stats;
+	u32 mac_hash1;
+	u32 mac_hash2;
+	u32 multicast_hash_cnt[EMAC_NUM_MULTICAST_BITS];
+	u32 rx_addr_type;
+	/* periodic timer required for MDIO polling */
+	struct timer_list periodic_timer;
+	u32 periodic_ticks;
+	u32 timer_active;
+	u32 phy_mask;
+	/* mii_bus,phy members */
+	struct mii_bus *mii_bus;
+	struct phy_device *phydev;
+	spinlock_t lock;
+};
+
+/* clock frequency for EMAC */
+static struct clk *emac_clk;
+static unsigned long emac_bus_frequency;
+static unsigned long mdio_max_freq;
+
+/* EMAC internal utility function */
+static inline u32 emac_virt_to_phys(void __iomem *addr)
+{
+	return (u32 __force) io_v2p(addr);
+}
+
+/* Cache macros - Packet buffers would be from skb pool which is cached */
+#define EMAC_VIRT_NOCACHE(addr) (addr)
+#define EMAC_CACHE_INVALIDATE(addr, size) \
+	dma_cache_maint((void *)addr, size, DMA_FROM_DEVICE)
+#define EMAC_CACHE_WRITEBACK(addr, size) \
+	dma_cache_maint((void *)addr, size, DMA_TO_DEVICE)
+#define EMAC_CACHE_WRITEBACK_INVALIDATE(addr, size) \
+	dma_cache_maint((void *)addr, size, DMA_BIDIRECTIONAL)
+
+/* DM644x does not have BD's in cached memory - so no cache functions */
+#define BD_CACHE_INVALIDATE(addr, size)
+#define BD_CACHE_WRITEBACK(addr, size)
+#define BD_CACHE_WRITEBACK_INVALIDATE(addr, size)
+
+/* EMAC TX Host Error description strings */
+static char *emac_txhost_errcodes[16] = {
+	"No error", "SOP error", "Ownership bit not set in SOP buffer",
+	"Zero Next Buffer Descriptor Pointer Without EOP",
+	"Zero Buffer Pointer", "Zero Buffer Length", "Packet Length Error",
+	"Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
+	"Reserved", "Reserved", "Reserved", "Reserved"
+};
+
+/* EMAC RX Host Error description strings */
+static char *emac_rxhost_errcodes[16] = {
+	"No error", "Reserved", "Ownership bit not set in input buffer",
+	"Reserved", "Zero Buffer Pointer", "Reserved", "Reserved",
+	"Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
+	"Reserved", "Reserved", "Reserved", "Reserved"
+};
+
+/* Helper macros */
+#define emac_read(reg)		  ioread32(priv->emac_base + (reg))
+#define emac_write(reg, val)      iowrite32(val, priv->emac_base + (reg))
+
+#define emac_ctrl_read(reg)	  ioread32((priv->ctrl_base + (reg)))
+#define emac_ctrl_write(reg, val) iowrite32(val, (priv->ctrl_base + (reg)))
+
+#define emac_mdio_read(reg)	  ioread32(bus->priv + (reg))
+#define emac_mdio_write(reg, val) iowrite32(val, (bus->priv + (reg)))
+
+/**
+ * emac_dump_regs: Dump important EMAC registers to debug terminal
+ * @priv: The DaVinci EMAC private adapter structure
+ *
+ * Executes ethtool set cmd & sets phy mode
+ *
+ */
+static void emac_dump_regs(struct emac_priv *priv)
+{
+	struct device *emac_dev = &priv->ndev->dev;
+
+	/* Print important registers in EMAC */
+	dev_info(emac_dev, "EMAC Basic registers\n");
+	dev_info(emac_dev, "EMAC: EWCTL: %08X, EWINTTCNT: %08X\n",
+		emac_ctrl_read(EMAC_CTRL_EWCTL),
+		emac_ctrl_read(EMAC_CTRL_EWINTTCNT));
+	dev_info(emac_dev, "EMAC: TXID: %08X %s, RXID: %08X %s\n",
+		emac_read(EMAC_TXIDVER),
+		((emac_read(EMAC_TXCONTROL)) ? "enabled" : "disabled"),
+		emac_read(EMAC_RXIDVER),
+		((emac_read(EMAC_RXCONTROL)) ? "enabled" : "disabled"));
+	dev_info(emac_dev, "EMAC: TXIntRaw:%08X, TxIntMasked: %08X, "\
+		"TxIntMasSet: %08X\n", emac_read(EMAC_TXINTSTATRAW),
+		emac_read(EMAC_TXINTSTATMASKED), emac_read(EMAC_TXINTMASKSET));
+	dev_info(emac_dev, "EMAC: RXIntRaw:%08X, RxIntMasked: %08X, "\
+		"RxIntMasSet: %08X\n", emac_read(EMAC_RXINTSTATRAW),
+		emac_read(EMAC_RXINTSTATMASKED), emac_read(EMAC_RXINTMASKSET));
+	dev_info(emac_dev, "EMAC: MacIntRaw:%08X, MacIntMasked: %08X, "\
+		"MacInVector=%08X\n", emac_read(EMAC_MACINTSTATRAW),
+		emac_read(EMAC_MACINTSTATMASKED), emac_read(EMAC_MACINVECTOR));
+	dev_info(emac_dev, "EMAC: EmuControl:%08X, FifoControl: %08X\n",
+		emac_read(EMAC_EMCONTROL), emac_read(EMAC_FIFOCONTROL));
+	dev_info(emac_dev, "EMAC: MBPEnable:%08X, RXUnicastSet: %08X, "\
+		"RXMaxLen=%08X\n", emac_read(EMAC_RXMBPENABLE),
+		emac_read(EMAC_RXUNICASTSET), emac_read(EMAC_RXMAXLEN));
+	dev_info(emac_dev, "EMAC: MacControl:%08X, MacStatus: %08X, "\
+		"MacConfig=%08X\n", emac_read(EMAC_MACCONTROL),
+		emac_read(EMAC_MACSTATUS), emac_read(EMAC_MACCONFIG));
+	dev_info(emac_dev, "EMAC: TXHDP[0]:%08X, RXHDP[0]: %08X\n",
+		emac_read(EMAC_TXHDP(0)), emac_read(EMAC_RXHDP(0)));
+	dev_info(emac_dev, "EMAC Statistics\n");
+	dev_info(emac_dev, "EMAC: rx_good_frames:%d\n",
+		emac_read(EMAC_RXGOODFRAMES));
+	dev_info(emac_dev, "EMAC: rx_broadcast_frames:%d\n",
+		emac_read(EMAC_RXBCASTFRAMES));
+	dev_info(emac_dev, "EMAC: rx_multicast_frames:%d\n",
+		emac_read(EMAC_RXMCASTFRAMES));
+	dev_info(emac_dev, "EMAC: rx_pause_frames:%d\n",
+		emac_read(EMAC_RXPAUSEFRAMES));
+	dev_info(emac_dev, "EMAC: rx_crcerrors:%d\n",
+		emac_read(EMAC_RXCRCERRORS));
+	dev_info(emac_dev, "EMAC: rx_align_code_errors:%d\n",
+		emac_read(EMAC_RXALIGNCODEERRORS));
+	dev_info(emac_dev, "EMAC: rx_oversized_frames:%d\n",
+		emac_read(EMAC_RXOVERSIZED));
+	dev_info(emac_dev, "EMAC: rx_jabber_frames:%d\n",
+		emac_read(EMAC_RXJABBER));
+	dev_info(emac_dev, "EMAC: rx_undersized_frames:%d\n",
+		emac_read(EMAC_RXUNDERSIZED));
+	dev_info(emac_dev, "EMAC: rx_fragments:%d\n",
+		emac_read(EMAC_RXFRAGMENTS));
+	dev_info(emac_dev, "EMAC: rx_filtered_frames:%d\n",
+		emac_read(EMAC_RXFILTERED));
+	dev_info(emac_dev, "EMAC: rx_qos_filtered_frames:%d\n",
+		emac_read(EMAC_RXQOSFILTERED));
+	dev_info(emac_dev, "EMAC: rx_octets:%d\n",
+		emac_read(EMAC_RXOCTETS));
+	dev_info(emac_dev, "EMAC: tx_goodframes:%d\n",
+		emac_read(EMAC_TXGOODFRAMES));
+	dev_info(emac_dev, "EMAC: tx_bcastframes:%d\n",
+		emac_read(EMAC_TXBCASTFRAMES));
+	dev_info(emac_dev, "EMAC: tx_mcastframes:%d\n",
+		emac_read(EMAC_TXMCASTFRAMES));
+	dev_info(emac_dev, "EMAC: tx_pause_frames:%d\n",
+		emac_read(EMAC_TXPAUSEFRAMES));
+	dev_info(emac_dev, "EMAC: tx_deferred_frames:%d\n",
+		emac_read(EMAC_TXDEFERRED));
+	dev_info(emac_dev, "EMAC: tx_collision_frames:%d\n",
+		emac_read(EMAC_TXCOLLISION));
+	dev_info(emac_dev, "EMAC: tx_single_coll_frames:%d\n",
+		emac_read(EMAC_TXSINGLECOLL));
+	dev_info(emac_dev, "EMAC: tx_mult_coll_frames:%d\n",
+		emac_read(EMAC_TXMULTICOLL));
+	dev_info(emac_dev, "EMAC: tx_excessive_collisions:%d\n",
+		emac_read(EMAC_TXEXCESSIVECOLL));
+	dev_info(emac_dev, "EMAC: tx_late_collisions:%d\n",
+		emac_read(EMAC_TXLATECOLL));
+	dev_info(emac_dev, "EMAC: tx_underrun:%d\n",
+		emac_read(EMAC_TXUNDERRUN));
+	dev_info(emac_dev, "EMAC: tx_carrier_sense_errors:%d\n",
+		emac_read(EMAC_TXCARRIERSENSE));
+	dev_info(emac_dev, "EMAC: tx_octets:%d\n",
+		emac_read(EMAC_TXOCTETS));
+	dev_info(emac_dev, "EMAC: net_octets:%d\n",
+		emac_read(EMAC_NETOCTETS));
+	dev_info(emac_dev, "EMAC: rx_sof_overruns:%d\n",
+		emac_read(EMAC_RXSOFOVERRUNS));
+	dev_info(emac_dev, "EMAC: rx_mof_overruns:%d\n",
+		emac_read(EMAC_RXMOFOVERRUNS));
+	dev_info(emac_dev, "EMAC: rx_dma_overruns:%d\n",
+		emac_read(EMAC_RXDMAOVERRUNS));
+}
+
+/*************************************************************************
+ *  EMAC MDIO/Phy Functionality
+ *************************************************************************/
+/**
+ * emac_get_drvinfo: Get EMAC driver information
+ * @ndev: The DaVinci EMAC network adapter
+ * @info: ethtool info structure containing name and version
+ *
+ * Returns EMAC driver information (name and version)
+ *
+ */
+static void emac_get_drvinfo(struct net_device *ndev,
+			     struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, emac_version_string);
+	strcpy(info->version, EMAC_MODULE_VERSION);
+}
+
+/**
+ * emac_get_settings: Get EMAC settings
+ * @ndev: The DaVinci EMAC network adapter
+ * @ecmd: ethtool command
+ *
+ * Executes ethool get command
+ *
+ */
+static int emac_get_settings(struct net_device *ndev,
+			     struct ethtool_cmd *ecmd)
+{
+	struct emac_priv *priv = netdev_priv(ndev);
+	if (priv->phy_mask)
+		return phy_ethtool_gset(priv->phydev, ecmd);
+	else
+		return -EOPNOTSUPP;
+
+}
+
+/**
+ * emac_set_settings: Set EMAC settings
+ * @ndev: The DaVinci EMAC network adapter
+ * @ecmd: ethtool command
+ *
+ * Executes ethool set command
+ *
+ */
+static int emac_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
+{
+	struct emac_priv *priv = netdev_priv(ndev);
+	if (priv->phy_mask)
+		return phy_ethtool_sset(priv->phydev, ecmd);
+	else
+		return -EOPNOTSUPP;
+
+}
+
+/**
+ * ethtool_ops: DaVinci EMAC Ethtool structure
+ *
+ * Ethtool support for EMAC adapter
+ *
+ */
+static const struct ethtool_ops ethtool_ops = {
+	.get_drvinfo = emac_get_drvinfo,
+	.get_settings = emac_get_settings,
+	.set_settings = emac_set_settings,
+	.get_link = ethtool_op_get_link,
+};
+
+/**
+ * emac_update_phystatus: Update Phy status
+ * @priv: The DaVinci EMAC private adapter structure
+ *
+ * Updates phy status and takes action for network queue if required
+ * based upon link status
+ *
+ */
+static void emac_update_phystatus(struct emac_priv *priv)
+{
+	u32 mac_control;
+	u32 new_duplex;
+	u32 cur_duplex;
+	struct net_device *ndev = priv->ndev;
+
+	mac_control = emac_read(EMAC_MACCONTROL);
+	cur_duplex = (mac_control & EMAC_MACCONTROL_FULLDUPLEXEN) ?
+			DUPLEX_FULL : DUPLEX_HALF;
+	if (priv->phy_mask)
+		new_duplex = priv->phydev->duplex;
+	else
+		new_duplex = DUPLEX_FULL;
+
+	/* We get called only if link has changed (speed/duplex/status) */
+	if ((priv->link) && (new_duplex != cur_duplex)) {
+		priv->duplex = new_duplex;
+		if (DUPLEX_FULL == priv->duplex)
+			mac_control |= (EMAC_MACCONTROL_FULLDUPLEXEN);
+		else
+			mac_control &= ~(EMAC_MACCONTROL_FULLDUPLEXEN);
+	}
+
+	if (priv->speed == SPEED_1000 && (priv->version == EMAC_VERSION_2)) {
+		mac_control = emac_read(EMAC_MACCONTROL);
+		mac_control |= (EMAC_DM646X_MACCONTORL_GMIIEN |
+				EMAC_DM646X_MACCONTORL_GIG |
+				EMAC_DM646X_MACCONTORL_GIGFORCE);
+	} else {
+		/* Clear the GIG bit and GIGFORCE bit */
+		mac_control &= ~(EMAC_DM646X_MACCONTORL_GIGFORCE |
+					EMAC_DM646X_MACCONTORL_GIG);
+
+		if (priv->rmii_en && (priv->speed == SPEED_100))
+			mac_control |= EMAC_MACCONTROL_RMIISPEED_MASK;
+		else
+			mac_control &= ~EMAC_MACCONTROL_RMIISPEED_MASK;
+	}
+
+	/* Update mac_control if changed */
+	emac_write(EMAC_MACCONTROL, mac_control);
+
+	if (priv->link) {
+		/* link ON */
+		if (!netif_carrier_ok(ndev))
+			netif_carrier_on(ndev);
+	/* reactivate the transmit queue if it is stopped */
+		if (netif_running(ndev) && netif_queue_stopped(ndev))
+			netif_wake_queue(ndev);
+	} else {
+		/* link OFF */
+		if (netif_carrier_ok(ndev))
+			netif_carrier_off(ndev);
+		if (!netif_queue_stopped(ndev))
+			netif_stop_queue(ndev);
+	}
+}
+
+/**
+ * hash_get: Calculate hash value from mac address
+ * @addr: mac address to delete from hash table
+ *
+ * Calculates hash value from mac address
+ *
+ */
+static u32 hash_get(u8 *addr)
+{
+	u32 hash;
+	u8 tmpval;
+	int cnt;
+	hash = 0;
+
+	for (cnt = 0; cnt < 2; cnt++) {
+		tmpval = *addr++;
+		hash ^= (tmpval >> 2) ^ (tmpval << 4);
+		tmpval = *addr++;
+		hash ^= (tmpval >> 4) ^ (tmpval << 2);
+		tmpval = *addr++;
+		hash ^= (tmpval >> 6) ^ (tmpval);
+	}
+
+	return hash & 0x3F;
+}
+
+/**
+ * hash_add: Hash function to add mac addr from hash table
+ * @priv: The DaVinci EMAC private adapter structure
+ * mac_addr: mac address to delete from hash table
+ *
+ * Adds mac address to the internal hash table
+ *
+ */
+static int hash_add(struct emac_priv *priv, u8 *mac_addr)
+{
+	struct device *emac_dev = &priv->ndev->dev;
+	u32 rc = 0;
+	u32 hash_bit;
+	u32 hash_value = hash_get(mac_addr);
+
+	if (hash_value >= EMAC_NUM_MULTICAST_BITS) {
+		if (netif_msg_drv(priv)) {
+			dev_err(emac_dev, "DaVinci EMAC: hash_add(): Invalid "\
+				"Hash %08x, should not be greater than %08x",
+				hash_value, (EMAC_NUM_MULTICAST_BITS - 1));
+		}
+		return -1;
+	}
+
+	/* set the hash bit only if not previously set */
+	if (priv->multicast_hash_cnt[hash_value] == 0) {
+		rc = 1; /* hash value changed */
+		if (hash_value < 32) {
+			hash_bit = BIT(hash_value);
+			priv->mac_hash1 |= hash_bit;
+		} else {
+			hash_bit = BIT((hash_value - 32));
+			priv->mac_hash2 |= hash_bit;
+		}
+	}
+
+	/* incr counter for num of mcast addr's mapped to "this" hash bit */
+	++priv->multicast_hash_cnt[hash_value];
+
+	return rc;
+}
+
+/**
+ * hash_del: Hash function to delete mac addr from hash table
+ * @priv: The DaVinci EMAC private adapter structure
+ * mac_addr: mac address to delete from hash table
+ *
+ * Removes mac address from the internal hash table
+ *
+ */
+static int hash_del(struct emac_priv *priv, u8 *mac_addr)
+{
+	u32 hash_value;
+	u32 hash_bit;
+
+	hash_value = hash_get(mac_addr);
+	if (priv->multicast_hash_cnt[hash_value] > 0) {
+		/* dec cntr for num of mcast addr's mapped to this hash bit */
+		--priv->multicast_hash_cnt[hash_value];
+	}
+
+	/* if counter still > 0, at least one multicast address refers
+	 * to this hash bit. so return 0 */
+	if (priv->multicast_hash_cnt[hash_value] > 0)
+		return 0;
+
+	if (hash_value < 32) {
+		hash_bit = BIT(hash_value);
+		priv->mac_hash1 &= ~hash_bit;
+	} else {
+		hash_bit = BIT((hash_value - 32));
+		priv->mac_hash2 &= ~hash_bit;
+	}
+
+	/* return 1 to indicate change in mac_hash registers reqd */
+	return 1;
+}
+
+/* EMAC multicast operation */
+#define EMAC_MULTICAST_ADD	0
+#define EMAC_MULTICAST_DEL	1
+#define EMAC_ALL_MULTI_SET	2
+#define EMAC_ALL_MULTI_CLR	3
+
+/**
+ * emac_add_mcast: Set multicast address in the EMAC adapter (Internal)
+ * @priv: The DaVinci EMAC private adapter structure
+ * @action: multicast operation to perform
+ * mac_addr: mac address to set
+ *
+ * Set multicast addresses in EMAC adapter - internal function
+ *
+ */
+static void emac_add_mcast(struct emac_priv *priv, u32 action, u8 *mac_addr)
+{
+	struct device *emac_dev = &priv->ndev->dev;
+	int update = -1;
+
+	switch (action) {
+	case EMAC_MULTICAST_ADD:
+		update = hash_add(priv, mac_addr);
+		break;
+	case EMAC_MULTICAST_DEL:
+		update = hash_del(priv, mac_addr);
+		break;
+	case EMAC_ALL_MULTI_SET:
+		update = 1;
+		priv->mac_hash1 = EMAC_ALL_MULTI_REG_VALUE;
+		priv->mac_hash2 = EMAC_ALL_MULTI_REG_VALUE;
+		break;
+	case EMAC_ALL_MULTI_CLR:
+		update = 1;
+		priv->mac_hash1 = 0;
+		priv->mac_hash2 = 0;
+		memset(&(priv->multicast_hash_cnt[0]), 0,
+		sizeof(priv->multicast_hash_cnt[0]) *
+		       EMAC_NUM_MULTICAST_BITS);
+		break;
+	default:
+		if (netif_msg_drv(priv))
+			dev_err(emac_dev, "DaVinci EMAC: add_mcast"\
+				": bad operation %d", action);
+		break;
+	}
+
+	/* write to the hardware only if the register status chances */
+	if (update > 0) {
+		emac_write(EMAC_MACHASH1, priv->mac_hash1);
+		emac_write(EMAC_MACHASH2, priv->mac_hash2);
+	}
+}
+
+/**
+ * emac_dev_mcast_set: Set multicast address in the EMAC adapter
+ * @ndev: The DaVinci EMAC network adapter
+ *
+ * Set multicast addresses in EMAC adapter
+ *
+ */
+static void emac_dev_mcast_set(struct net_device *ndev)
+{
+	u32 mbp_enable;
+	struct emac_priv *priv = netdev_priv(ndev);
+
+	mbp_enable = emac_read(EMAC_RXMBPENABLE);
+	if (ndev->flags & IFF_PROMISC) {
+		mbp_enable &= (~EMAC_MBP_PROMISCCH(EMAC_DEF_PROM_CH));
+		mbp_enable |= (EMAC_MBP_RXPROMISC);
+	} else {
+		mbp_enable = (mbp_enable & ~EMAC_MBP_RXPROMISC);
+		if ((ndev->flags & IFF_ALLMULTI) ||
+		    (ndev->mc_count > EMAC_DEF_MAX_MULTICAST_ADDRESSES)) {
+			mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
+			emac_add_mcast(priv, EMAC_ALL_MULTI_SET, NULL);
+		}
+		if (ndev->mc_count > 0) {
+			struct dev_mc_list *mc_ptr;
+			mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
+			emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
+			/* program multicast address list into EMAC hardware */
+			for (mc_ptr = ndev->mc_list; mc_ptr;
+			     mc_ptr = mc_ptr->next) {
+				emac_add_mcast(priv, EMAC_MULTICAST_ADD,
+					       (u8 *)mc_ptr->dmi_addr);
+			}
+		} else {
+			mbp_enable = (mbp_enable & ~EMAC_MBP_RXMCAST);
+			emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
+		}
+	}
+	/* Set mbp config register */
+	emac_write(EMAC_RXMBPENABLE, mbp_enable);
+}
+
+/*************************************************************************
+ *  EMAC Hardware manipulation
+ *************************************************************************/
+
+/**
+ * emac_int_disable: Disable EMAC module interrupt (from adapter)
+ * @priv: The DaVinci EMAC private adapter structure
+ *
+ * Disable EMAC interrupt on the adapter
+ *
+ */
+static void emac_int_disable(struct emac_priv *priv)
+{
+	if (priv->version == EMAC_VERSION_2) {
+		unsigned long flags;
+
+		local_irq_save(flags);
+
+		/* Program C0_Int_En to zero to turn off
+		* interrupts to the CPU */
+		emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0x0);
+		emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0x0);
+		/* NOTE: Rx Threshold and Misc interrupts are not disabled */
+
+		local_irq_restore(flags);
+
+	} else {
+		/* Set DM644x control registers for interrupt control */
+		emac_ctrl_write(EMAC_CTRL_EWCTL, 0x0);
+	}
+}
+
+/**
+ * emac_int_enable: Enable EMAC module interrupt (from adapter)
+ * @priv: The DaVinci EMAC private adapter structure
+ *
+ * Enable EMAC interrupt on the adapter
+ *
+ */
+static void emac_int_enable(struct emac_priv *priv)
+{
+	if (priv->version == EMAC_VERSION_2) {
+		emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0xff);
+		emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0xff);
+
+		/* In addition to turning on interrupt Enable, we need
+		 * ack by writing appropriate values to the EOI
+		 * register */
+
+		/* NOTE: Rx Threshold and Misc interrupts are not enabled */
+
+		/* ack rxen only then a new pulse will be generated */
+		emac_write(EMAC_DM646X_MACEOIVECTOR,
+			EMAC_DM646X_MAC_EOI_C0_RXEN);
+
+		/* ack txen- only then a new pulse will be generated */
+		emac_write(EMAC_DM646X_MACEOIVECTOR,
+			EMAC_DM646X_MAC_EOI_C0_TXEN);
+
+	} else {
+		/* Set DM644x control registers for interrupt control */
+		emac_ctrl_write(EMAC_CTRL_EWCTL, 0x1);
+	}
+}
+
+/**
+ * emac_irq: EMAC interrupt handler
+ * @irq: interrupt number
+ * @dev_id: EMAC network adapter data structure ptr
+ *
+ * EMAC Interrupt handler - we only schedule NAPI and not process any packets
+ * here. EVen the interrupt status is checked (TX/RX/Err) in NAPI poll function
+ *
+ * Returns interrupt handled condition
+ */
+static irqreturn_t emac_irq(int irq, void *dev_id)
+{
+	struct net_device *ndev = (struct net_device *)dev_id;
+	struct emac_priv *priv = netdev_priv(ndev);
+
+	++priv->isr_count;
+	if (likely(netif_running(priv->ndev))) {
+		emac_int_disable(priv);
+		napi_schedule(&priv->napi);
+	} else {
+		/* we are closing down, so do