net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver
Kristoffer Glembo [Mon, 15 Feb 2010 03:33:44 +0000 (03:33 +0000)]
Adds device driver for Aeroflex Gaisler 10/100 and 10/100/1G Ethernet
MAC IP cores.

Signed-off-by: Kristoffer Glembo <kristoffer@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS
drivers/net/Kconfig
drivers/net/Makefile
drivers/net/greth.c [new file with mode: 0644]
drivers/net/greth.h [new file with mode: 0644]

index 64a237b..32f6915 100644 (file)
@@ -2373,6 +2373,12 @@ F:       Documentation/isdn/README.gigaset
 F:     drivers/isdn/gigaset/
 F:     include/linux/gigaset_dev.h
 
+GRETH 10/100/1G Ethernet MAC device driver
+M:     Kristoffer Glembo <kristoffer@gaisler.com>
+L:     netdev@vger.kernel.org
+S:     Maintained
+F:     drivers/net/greth*
+
 HARD DRIVE ACTIVE PROTECTION SYSTEM (HDAPS) DRIVER
 M:     Frank Seidel <frank@f-seidel.de>
 L:     lm-sensors@lm-sensors.org
index 0690577..17ff15f 100644 (file)
@@ -995,6 +995,14 @@ config ETHOC
        help
          Say Y here if you want to use the OpenCores 10/100 Mbps Ethernet MAC.
 
+config GRETH
+       tristate "Aeroflex Gaisler GRETH Ethernet MAC support"
+       depends on OF
+       select PHYLIB
+       select CRC32
+       help
+         Say Y here if you want to use the Aeroflex Gaisler GRETH Ethernet MAC.
+
 config SMC911X
        tristate "SMSC LAN911[5678] support"
        select CRC32
index 622cfd4..4788862 100644 (file)
@@ -250,6 +250,7 @@ pasemi_mac_driver-objs := pasemi_mac.o pasemi_mac_ethtool.o
 obj-$(CONFIG_MLX4_CORE) += mlx4/
 obj-$(CONFIG_ENC28J60) += enc28j60.o
 obj-$(CONFIG_ETHOC) += ethoc.o
+obj-$(CONFIG_GRETH) += greth.o
 
 obj-$(CONFIG_XTENSA_XT2000_SONIC) += xtsonic.o
 
diff --git a/drivers/net/greth.c b/drivers/net/greth.c
new file mode 100644 (file)
index 0000000..457da1c
--- /dev/null
@@ -0,0 +1,1645 @@
+/*
+ * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
+ *
+ * 2005-2009 (c) Aeroflex Gaisler AB
+ *
+ * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
+ * available in the GRLIB VHDL IP core library.
+ *
+ * Full documentation of both cores can be found here:
+ * http://www.gaisler.com/products/grlib/grip.pdf
+ *
+ * The Gigabit version supports scatter/gather DMA, any alignment of
+ * buffers and checksum offloading.
+ *
+ * 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.
+ *
+ * Contributors: Kristoffer Glembo
+ *               Daniel Hellstrom
+ *               Marko Isomaki
+ */
+
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/skbuff.h>
+#include <linux/io.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <asm/cacheflush.h>
+#include <asm/byteorder.h>
+
+#ifdef CONFIG_SPARC
+#include <asm/idprom.h>
+#endif
+
+#include "greth.h"
+
+#define GRETH_DEF_MSG_ENABLE     \
+       (NETIF_MSG_DRV          | \
+        NETIF_MSG_PROBE        | \
+        NETIF_MSG_LINK         | \
+        NETIF_MSG_IFDOWN       | \
+        NETIF_MSG_IFUP         | \
+        NETIF_MSG_RX_ERR       | \
+        NETIF_MSG_TX_ERR)
+
+static int greth_debug = -1;   /* -1 == use GRETH_DEF_MSG_ENABLE as value */
+module_param(greth_debug, int, 0);
+MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
+
+/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
+static int macaddr[6];
+module_param_array(macaddr, int, NULL, 0);
+MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
+
+static int greth_edcl = 1;
+module_param(greth_edcl, int, 0);
+MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
+
+static int greth_open(struct net_device *dev);
+static int greth_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static int greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev);
+static int greth_rx(struct net_device *dev, int limit);
+static int greth_rx_gbit(struct net_device *dev, int limit);
+static void greth_clean_tx(struct net_device *dev);
+static void greth_clean_tx_gbit(struct net_device *dev);
+static irqreturn_t greth_interrupt(int irq, void *dev_id);
+static int greth_close(struct net_device *dev);
+static int greth_set_mac_add(struct net_device *dev, void *p);
+static void greth_set_multicast_list(struct net_device *dev);
+
+#define GRETH_REGLOAD(a)           (be32_to_cpu(__raw_readl(&(a))))
+#define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
+#define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
+#define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
+
+#define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
+#define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
+#define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
+
+static void greth_print_rx_packet(void *addr, int len)
+{
+       print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
+                       addr, len, true);
+}
+
+static void greth_print_tx_packet(struct sk_buff *skb)
+{
+       int i;
+       int length;
+
+       if (skb_shinfo(skb)->nr_frags == 0)
+               length = skb->len;
+       else
+               length = skb_headlen(skb);
+
+       print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
+                       skb->data, length, true);
+
+       for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+
+               print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
+                              phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
+                              skb_shinfo(skb)->frags[i].page_offset,
+                              length, true);
+       }
+}
+
+static inline void greth_enable_tx(struct greth_private *greth)
+{
+       wmb();
+       GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
+}
+
+static inline void greth_disable_tx(struct greth_private *greth)
+{
+       GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
+}
+
+static inline void greth_enable_rx(struct greth_private *greth)
+{
+       wmb();
+       GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
+}
+
+static inline void greth_disable_rx(struct greth_private *greth)
+{
+       GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
+}
+
+static inline void greth_enable_irqs(struct greth_private *greth)
+{
+       GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
+}
+
+static inline void greth_disable_irqs(struct greth_private *greth)
+{
+       GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
+}
+
+static inline void greth_write_bd(u32 *bd, u32 val)
+{
+       __raw_writel(cpu_to_be32(val), bd);
+}
+
+static inline u32 greth_read_bd(u32 *bd)
+{
+       return be32_to_cpu(__raw_readl(bd));
+}
+
+static void greth_clean_rings(struct greth_private *greth)
+{
+       int i;
+       struct greth_bd *rx_bdp = greth->rx_bd_base;
+       struct greth_bd *tx_bdp = greth->tx_bd_base;
+
+       if (greth->gbit_mac) {
+
+               /* Free and unmap RX buffers */
+               for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
+                       if (greth->rx_skbuff[i] != NULL) {
+                               dev_kfree_skb(greth->rx_skbuff[i]);
+                               dma_unmap_single(greth->dev,
+                                                greth_read_bd(&rx_bdp->addr),
+                                                MAX_FRAME_SIZE+NET_IP_ALIGN,
+                                                DMA_FROM_DEVICE);
+                       }
+               }
+
+               /* TX buffers */
+               while (greth->tx_free < GRETH_TXBD_NUM) {
+
+                       struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
+                       int nr_frags = skb_shinfo(skb)->nr_frags;
+                       tx_bdp = greth->tx_bd_base + greth->tx_last;
+                       greth->tx_last = NEXT_TX(greth->tx_last);
+
+                       dma_unmap_single(greth->dev,
+                                        greth_read_bd(&tx_bdp->addr),
+                                        skb_headlen(skb),
+                                        DMA_TO_DEVICE);
+
+                       for (i = 0; i < nr_frags; i++) {
+                               skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+                               tx_bdp = greth->tx_bd_base + greth->tx_last;
+
+                               dma_unmap_page(greth->dev,
+                                              greth_read_bd(&tx_bdp->addr),
+                                              frag->size,
+                                              DMA_TO_DEVICE);
+
+                               greth->tx_last = NEXT_TX(greth->tx_last);
+                       }
+                       greth->tx_free += nr_frags+1;
+                       dev_kfree_skb(skb);
+               }
+
+
+       } else { /* 10/100 Mbps MAC */
+
+               for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
+                       kfree(greth->rx_bufs[i]);
+                       dma_unmap_single(greth->dev,
+                                        greth_read_bd(&rx_bdp->addr),
+                                        MAX_FRAME_SIZE,
+                                        DMA_FROM_DEVICE);
+               }
+               for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
+                       kfree(greth->tx_bufs[i]);
+                       dma_unmap_single(greth->dev,
+                                        greth_read_bd(&tx_bdp->addr),
+                                        MAX_FRAME_SIZE,
+                                        DMA_TO_DEVICE);
+               }
+       }
+}
+
+static int greth_init_rings(struct greth_private *greth)
+{
+       struct sk_buff *skb;
+       struct greth_bd *rx_bd, *tx_bd;
+       u32 dma_addr;
+       int i;
+
+       rx_bd = greth->rx_bd_base;
+       tx_bd = greth->tx_bd_base;
+
+       /* Initialize descriptor rings and buffers */
+       if (greth->gbit_mac) {
+
+               for (i = 0; i < GRETH_RXBD_NUM; i++) {
+                       skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
+                       if (skb == NULL) {
+                               if (netif_msg_ifup(greth))
+                                       dev_err(greth->dev, "Error allocating DMA ring.\n");
+                               goto cleanup;
+                       }
+                       skb_reserve(skb, NET_IP_ALIGN);
+                       dma_addr = dma_map_single(greth->dev,
+                                                 skb->data,
+                                                 MAX_FRAME_SIZE+NET_IP_ALIGN,
+                                                 DMA_FROM_DEVICE);
+
+                       if (dma_mapping_error(greth->dev, dma_addr)) {
+                               if (netif_msg_ifup(greth))
+                                       dev_err(greth->dev, "Could not create initial DMA mapping\n");
+                               goto cleanup;
+                       }
+                       greth->rx_skbuff[i] = skb;
+                       greth_write_bd(&rx_bd[i].addr, dma_addr);
+                       greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
+               }
+
+       } else {
+
+               /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
+               for (i = 0; i < GRETH_RXBD_NUM; i++) {
+
+                       greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
+
+                       if (greth->rx_bufs[i] == NULL) {
+                               if (netif_msg_ifup(greth))
+                                       dev_err(greth->dev, "Error allocating DMA ring.\n");
+                               goto cleanup;
+                       }
+
+                       dma_addr = dma_map_single(greth->dev,
+                                                 greth->rx_bufs[i],
+                                                 MAX_FRAME_SIZE,
+                                                 DMA_FROM_DEVICE);
+
+                       if (dma_mapping_error(greth->dev, dma_addr)) {
+                               if (netif_msg_ifup(greth))
+                                       dev_err(greth->dev, "Could not create initial DMA mapping\n");
+                               goto cleanup;
+                       }
+                       greth_write_bd(&rx_bd[i].addr, dma_addr);
+                       greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
+               }
+               for (i = 0; i < GRETH_TXBD_NUM; i++) {
+
+                       greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
+
+                       if (greth->tx_bufs[i] == NULL) {
+                               if (netif_msg_ifup(greth))
+                                       dev_err(greth->dev, "Error allocating DMA ring.\n");
+                               goto cleanup;
+                       }
+
+                       dma_addr = dma_map_single(greth->dev,
+                                                 greth->tx_bufs[i],
+                                                 MAX_FRAME_SIZE,
+                                                 DMA_TO_DEVICE);
+
+                       if (dma_mapping_error(greth->dev, dma_addr)) {
+                               if (netif_msg_ifup(greth))
+                                       dev_err(greth->dev, "Could not create initial DMA mapping\n");
+                               goto cleanup;
+                       }
+                       greth_write_bd(&tx_bd[i].addr, dma_addr);
+                       greth_write_bd(&tx_bd[i].stat, 0);
+               }
+       }
+       greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
+                      greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
+
+       /* Initialize pointers. */
+       greth->rx_cur = 0;
+       greth->tx_next = 0;
+       greth->tx_last = 0;
+       greth->tx_free = GRETH_TXBD_NUM;
+
+       /* Initialize descriptor base address */
+       GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
+       GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
+
+       return 0;
+
+cleanup:
+       greth_clean_rings(greth);
+       return -ENOMEM;
+}
+
+static int greth_open(struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       int err;
+
+       err = greth_init_rings(greth);
+       if (err) {
+               if (netif_msg_ifup(greth))
+                       dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
+               return err;
+       }
+
+       err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
+       if (err) {
+               if (netif_msg_ifup(greth))
+                       dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
+               greth_clean_rings(greth);
+               return err;
+       }
+
+       if (netif_msg_ifup(greth))
+               dev_dbg(&dev->dev, " starting queue\n");
+       netif_start_queue(dev);
+
+       napi_enable(&greth->napi);
+
+       greth_enable_irqs(greth);
+       greth_enable_tx(greth);
+       greth_enable_rx(greth);
+       return 0;
+
+}
+
+static int greth_close(struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+
+       napi_disable(&greth->napi);
+
+       greth_disable_tx(greth);
+
+       netif_stop_queue(dev);
+
+       free_irq(greth->irq, (void *) dev);
+
+       greth_clean_rings(greth);
+
+       return 0;
+}
+
+static int greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       struct greth_bd *bdp;
+       int err = NETDEV_TX_OK;
+       u32 status, dma_addr;
+
+       bdp = greth->tx_bd_base + greth->tx_next;
+
+       if (unlikely(greth->tx_free <= 0)) {
+               netif_stop_queue(dev);
+               return NETDEV_TX_BUSY;
+       }
+
+       if (netif_msg_pktdata(greth))
+               greth_print_tx_packet(skb);
+
+
+       if (unlikely(skb->len > MAX_FRAME_SIZE)) {
+               dev->stats.tx_errors++;
+               goto out;
+       }
+
+       dma_addr = greth_read_bd(&bdp->addr);
+
+       memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
+
+       dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
+
+       status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
+
+       /* Wrap around descriptor ring */
+       if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
+               status |= GRETH_BD_WR;
+       }
+
+       greth->tx_next = NEXT_TX(greth->tx_next);
+       greth->tx_free--;
+
+       /* No more descriptors */
+       if (unlikely(greth->tx_free == 0)) {
+
+               /* Free transmitted descriptors */
+               greth_clean_tx(dev);
+
+               /* If nothing was cleaned, stop queue & wait for irq */
+               if (unlikely(greth->tx_free == 0)) {
+                       status |= GRETH_BD_IE;
+                       netif_stop_queue(dev);
+               }
+       }
+
+       /* Write descriptor control word and enable transmission */
+       greth_write_bd(&bdp->stat, status);
+       greth_enable_tx(greth);
+
+out:
+       dev_kfree_skb(skb);
+       return err;
+}
+
+
+static int greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       struct greth_bd *bdp;
+       u32 status = 0, dma_addr;
+       int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
+
+       nr_frags = skb_shinfo(skb)->nr_frags;
+
+       if (greth->tx_free < nr_frags + 1) {
+               netif_stop_queue(dev);
+               err = NETDEV_TX_BUSY;
+               goto out;
+       }
+
+       if (netif_msg_pktdata(greth))
+               greth_print_tx_packet(skb);
+
+       if (unlikely(skb->len > MAX_FRAME_SIZE)) {
+               dev->stats.tx_errors++;
+               goto out;
+       }
+
+       /* Save skb pointer. */
+       greth->tx_skbuff[greth->tx_next] = skb;
+
+       /* Linear buf */
+       if (nr_frags != 0)
+               status = GRETH_TXBD_MORE;
+
+       status |= GRETH_TXBD_CSALL;
+       status |= skb_headlen(skb) & GRETH_BD_LEN;
+       if (greth->tx_next == GRETH_TXBD_NUM_MASK)
+               status |= GRETH_BD_WR;
+
+
+       bdp = greth->tx_bd_base + greth->tx_next;
+       greth_write_bd(&bdp->stat, status);
+       dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
+
+       if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
+               goto map_error;
+
+       greth_write_bd(&bdp->addr, dma_addr);
+
+       curr_tx = NEXT_TX(greth->tx_next);
+
+       /* Frags */
+       for (i = 0; i < nr_frags; i++) {
+               skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+               greth->tx_skbuff[curr_tx] = NULL;
+               bdp = greth->tx_bd_base + curr_tx;
+
+               status = GRETH_TXBD_CSALL;
+               status |= frag->size & GRETH_BD_LEN;
+
+               /* Wrap around descriptor ring */
+               if (curr_tx == GRETH_TXBD_NUM_MASK)
+                       status |= GRETH_BD_WR;
+
+               /* More fragments left */
+               if (i < nr_frags - 1)
+                       status |= GRETH_TXBD_MORE;
+
+               /* ... last fragment, check if out of descriptors  */
+               else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
+
+                       /* Enable interrupts and stop queue */
+                       status |= GRETH_BD_IE;
+                       netif_stop_queue(dev);
+               }
+
+               greth_write_bd(&bdp->stat, status);
+
+               dma_addr = dma_map_page(greth->dev,
+                                       frag->page,
+                                       frag->page_offset,
+                                       frag->size,
+                                       DMA_TO_DEVICE);
+
+               if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
+                       goto frag_map_error;
+
+               greth_write_bd(&bdp->addr, dma_addr);
+
+               curr_tx = NEXT_TX(curr_tx);
+       }
+
+       wmb();
+
+       /* Enable the descriptors that we configured ...  */
+       for (i = 0; i < nr_frags + 1; i++) {
+               bdp = greth->tx_bd_base + greth->tx_next;
+               greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
+               greth->tx_next = NEXT_TX(greth->tx_next);
+               greth->tx_free--;
+       }
+
+       greth_enable_tx(greth);
+
+       return NETDEV_TX_OK;
+
+frag_map_error:
+       /* Unmap SKB mappings that succeeded */
+       for (i = 0; greth->tx_next + i != curr_tx; i++) {
+               bdp = greth->tx_bd_base + greth->tx_next + i;
+               dma_unmap_single(greth->dev,
+                                greth_read_bd(&bdp->addr),
+                                greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
+                                DMA_TO_DEVICE);
+       }
+map_error:
+       if (net_ratelimit())
+               dev_warn(greth->dev, "Could not create TX DMA mapping\n");
+       dev_kfree_skb(skb);
+       return NETDEV_TX_OK;
+
+out:
+       return err;
+}
+
+
+static irqreturn_t greth_interrupt(int irq, void *dev_id)
+{
+       struct net_device *dev = dev_id;
+       struct greth_private *greth;
+       u32 status;
+       irqreturn_t retval = IRQ_NONE;
+
+       greth = netdev_priv(dev);
+
+       spin_lock(&greth->devlock);
+
+       /* Get the interrupt events that caused us to be here. */
+       status = GRETH_REGLOAD(greth->regs->status);
+
+       /* Handle rx and tx interrupts through poll */
+       if (status & (GRETH_INT_RX | GRETH_INT_TX)) {
+
+               /* Clear interrupt status */
+               GRETH_REGORIN(greth->regs->status,
+                             status & (GRETH_INT_RX | GRETH_INT_TX));
+
+               retval = IRQ_HANDLED;
+
+               /* Disable interrupts and schedule poll() */
+               greth_disable_irqs(greth);
+               napi_schedule(&greth->napi);
+       }
+
+       mmiowb();
+       spin_unlock(&greth->devlock);
+
+       return retval;
+}
+
+static void greth_clean_tx(struct net_device *dev)
+{
+       struct greth_private *greth;
+       struct greth_bd *bdp;
+       u32 stat;
+
+       greth = netdev_priv(dev);
+
+       while (1) {
+               bdp = greth->tx_bd_base + greth->tx_last;
+               stat = greth_read_bd(&bdp->stat);
+
+               if (unlikely(stat & GRETH_BD_EN))
+                       break;
+
+               if (greth->tx_free == GRETH_TXBD_NUM)
+                       break;
+
+               /* Check status for errors */
+               if (unlikely(stat & GRETH_TXBD_STATUS)) {
+                       dev->stats.tx_errors++;
+                       if (stat & GRETH_TXBD_ERR_AL)
+                               dev->stats.tx_aborted_errors++;
+                       if (stat & GRETH_TXBD_ERR_UE)
+                               dev->stats.tx_fifo_errors++;
+               }
+               dev->stats.tx_packets++;
+               greth->tx_last = NEXT_TX(greth->tx_last);
+               greth->tx_free++;
+       }
+
+       if (greth->tx_free > 0) {
+               netif_wake_queue(dev);
+       }
+
+}
+
+static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
+{
+       /* Check status for errors */
+       if (unlikely(stat & GRETH_TXBD_STATUS)) {
+               dev->stats.tx_errors++;
+               if (stat & GRETH_TXBD_ERR_AL)
+                       dev->stats.tx_aborted_errors++;
+               if (stat & GRETH_TXBD_ERR_UE)
+                       dev->stats.tx_fifo_errors++;
+               if (stat & GRETH_TXBD_ERR_LC)
+                       dev->stats.tx_aborted_errors++;
+       }
+       dev->stats.tx_packets++;
+}
+
+static void greth_clean_tx_gbit(struct net_device *dev)
+{
+       struct greth_private *greth;
+       struct greth_bd *bdp, *bdp_last_frag;
+       struct sk_buff *skb;
+       u32 stat;
+       int nr_frags, i;
+
+       greth = netdev_priv(dev);
+
+       while (greth->tx_free < GRETH_TXBD_NUM) {
+
+               skb = greth->tx_skbuff[greth->tx_last];
+
+               nr_frags = skb_shinfo(skb)->nr_frags;
+
+               /* We only clean fully completed SKBs */
+               bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
+               stat = bdp_last_frag->stat;
+
+               if (stat & GRETH_BD_EN)
+                       break;
+
+               greth->tx_skbuff[greth->tx_last] = NULL;
+
+               greth_update_tx_stats(dev, stat);
+
+               bdp = greth->tx_bd_base + greth->tx_last;
+
+               greth->tx_last = NEXT_TX(greth->tx_last);
+
+               dma_unmap_single(greth->dev,
+                                greth_read_bd(&bdp->addr),
+                                skb_headlen(skb),
+                                DMA_TO_DEVICE);
+
+               for (i = 0; i < nr_frags; i++) {
+                       skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+                       bdp = greth->tx_bd_base + greth->tx_last;
+
+                       dma_unmap_page(greth->dev,
+                                      greth_read_bd(&bdp->addr),
+                                      frag->size,
+                                      DMA_TO_DEVICE);
+
+                       greth->tx_last = NEXT_TX(greth->tx_last);
+               }
+               greth->tx_free += nr_frags+1;
+               dev_kfree_skb(skb);
+       }
+       if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
+               netif_wake_queue(dev);
+       }
+}
+
+static int greth_pending_packets(struct greth_private *greth)
+{
+       struct greth_bd *bdp;
+       u32 status;
+       bdp = greth->rx_bd_base + greth->rx_cur;
+       status = greth_read_bd(&bdp->stat);
+       if (status & GRETH_BD_EN)
+               return 0;
+       else
+               return 1;
+}
+
+static int greth_rx(struct net_device *dev, int limit)
+{
+       struct greth_private *greth;
+       struct greth_bd *bdp;
+       struct sk_buff *skb;
+       int pkt_len;
+       int bad, count;
+       u32 status, dma_addr;
+
+       greth = netdev_priv(dev);
+
+       for (count = 0; count < limit; ++count) {
+
+               bdp = greth->rx_bd_base + greth->rx_cur;
+               status = greth_read_bd(&bdp->stat);
+               dma_addr = greth_read_bd(&bdp->addr);
+               bad = 0;
+
+               if (unlikely(status & GRETH_BD_EN)) {
+                       break;
+               }
+
+               /* Check status for errors. */
+               if (unlikely(status & GRETH_RXBD_STATUS)) {
+                       if (status & GRETH_RXBD_ERR_FT) {
+                               dev->stats.rx_length_errors++;
+                               bad = 1;
+                       }
+                       if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
+                               dev->stats.rx_frame_errors++;
+                               bad = 1;
+                       }
+                       if (status & GRETH_RXBD_ERR_CRC) {
+                               dev->stats.rx_crc_errors++;
+                               bad = 1;
+                       }
+               }
+               if (unlikely(bad)) {
+                       dev->stats.rx_errors++;
+
+               } else {
+
+                       pkt_len = status & GRETH_BD_LEN;
+
+                       skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
+
+                       if (unlikely(skb == NULL)) {
+
+                               if (net_ratelimit())
+                                       dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
+
+                               dev->stats.rx_dropped++;
+
+                       } else {
+                               skb_reserve(skb, NET_IP_ALIGN);
+                               skb->dev = dev;
+
+                               dma_sync_single_for_cpu(greth->dev,
+                                                       dma_addr,
+                                                       pkt_len,
+                                                       DMA_FROM_DEVICE);
+
+                               if (netif_msg_pktdata(greth))
+                                       greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
+
+                               memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
+
+                               skb->protocol = eth_type_trans(skb, dev);
+                               dev->stats.rx_packets++;
+                               netif_receive_skb(skb);
+                       }
+               }
+
+               status = GRETH_BD_EN | GRETH_BD_IE;
+               if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
+                       status |= GRETH_BD_WR;
+               }
+
+               wmb();
+               greth_write_bd(&bdp->stat, status);
+
+               dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
+
+               greth_enable_rx(greth);
+
+               greth->rx_cur = NEXT_RX(greth->rx_cur);
+       }
+
+       return count;
+}
+
+static inline int hw_checksummed(u32 status)
+{
+
+       if (status & GRETH_RXBD_IP_FRAG)
+               return 0;
+
+       if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
+               return 0;
+
+       if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
+               return 0;
+
+       if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
+               return 0;
+
+       return 1;
+}
+
+static int greth_rx_gbit(struct net_device *dev, int limit)
+{
+       struct greth_private *greth;
+       struct greth_bd *bdp;
+       struct sk_buff *skb, *newskb;
+       int pkt_len;
+       int bad, count = 0;
+       u32 status, dma_addr;
+
+       greth = netdev_priv(dev);
+
+       for (count = 0; count < limit; ++count) {
+
+               bdp = greth->rx_bd_base + greth->rx_cur;
+               skb = greth->rx_skbuff[greth->rx_cur];
+               status = greth_read_bd(&bdp->stat);
+               bad = 0;
+
+               if (status & GRETH_BD_EN)
+                       break;
+
+               /* Check status for errors. */
+               if (unlikely(status & GRETH_RXBD_STATUS)) {
+
+                       if (status & GRETH_RXBD_ERR_FT) {
+                               dev->stats.rx_length_errors++;
+                               bad = 1;
+                       } else if (status &
+                                  (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
+                               dev->stats.rx_frame_errors++;
+                               bad = 1;
+                       } else if (status & GRETH_RXBD_ERR_CRC) {
+                               dev->stats.rx_crc_errors++;
+                               bad = 1;
+                       }
+               }
+
+               /* Allocate new skb to replace current */
+               newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);
+
+               if (!bad && newskb) {
+                       skb_reserve(newskb, NET_IP_ALIGN);
+
+                       dma_addr = dma_map_single(greth->dev,
+                                                     newskb->data,
+                                                     MAX_FRAME_SIZE + NET_IP_ALIGN,
+                                                     DMA_FROM_DEVICE);
+
+                       if (!dma_mapping_error(greth->dev, dma_addr)) {
+                               /* Process the incoming frame. */
+                               pkt_len = status & GRETH_BD_LEN;
+
+                               dma_unmap_single(greth->dev,
+                                                greth_read_bd(&bdp->addr),
+                                                MAX_FRAME_SIZE + NET_IP_ALIGN,
+                                                DMA_FROM_DEVICE);
+
+                               if (netif_msg_pktdata(greth))
+                                       greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
+
+                               skb_put(skb, pkt_len);
+
+                               if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
+                                       skb->ip_summed = CHECKSUM_UNNECESSARY;
+                               else
+                                       skb->ip_summed = CHECKSUM_NONE;
+
+                               skb->dev = dev;
+                               skb->protocol = eth_type_trans(skb, dev);
+                               dev->stats.rx_packets++;
+                               netif_receive_skb(skb);
+
+                               greth->rx_skbuff[greth->rx_cur] = newskb;
+                               greth_write_bd(&bdp->addr, dma_addr);
+                       } else {
+                               if (net_ratelimit())
+                                       dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
+                               dev_kfree_skb(newskb);
+                               dev->stats.rx_dropped++;
+                       }
+               } else {
+                       if (net_ratelimit())
+                               dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
+                       dev->stats.rx_dropped++;
+               }
+
+               status = GRETH_BD_EN | GRETH_BD_IE;
+               if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
+                       status |= GRETH_BD_WR;
+               }
+
+               wmb();
+               greth_write_bd(&bdp->stat, status);
+               greth_enable_rx(greth);
+               greth->rx_cur = NEXT_RX(greth->rx_cur);
+       }
+
+       return count;
+
+}
+
+static int greth_poll(struct napi_struct *napi, int budget)
+{
+       struct greth_private *greth;
+       int work_done = 0;
+       greth = container_of(napi, struct greth_private, napi);
+
+       if (greth->gbit_mac) {
+               greth_clean_tx_gbit(greth->netdev);
+       } else {
+               greth_clean_tx(greth->netdev);
+       }
+
+restart_poll:
+       if (greth->gbit_mac) {
+               work_done += greth_rx_gbit(greth->netdev, budget - work_done);
+       } else {
+               work_done += greth_rx(greth->netdev, budget - work_done);
+       }
+
+       if (work_done < budget) {
+
+               napi_complete(napi);
+
+               if (greth_pending_packets(greth)) {
+                       napi_reschedule(napi);
+                       goto restart_poll;
+               }
+       }
+
+       greth_enable_irqs(greth);
+       return work_done;
+}
+
+static int greth_set_mac_add(struct net_device *dev, void *p)
+{
+       struct sockaddr *addr = p;
+       struct greth_private *greth;
+       struct greth_regs *regs;
+
+       greth = (struct greth_private *) netdev_priv(dev);
+       regs = (struct greth_regs *) greth->regs;
+
+       if (!is_valid_ether_addr(addr->sa_data))
+               return -EINVAL;
+
+       memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+       GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
+       GRETH_REGSAVE(regs->esa_lsb,
+                     addr->sa_data[2] << 24 | addr->
+                     sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
+       return 0;
+}
+
+static u32 greth_hash_get_index(__u8 *addr)
+{
+       return (ether_crc(6, addr)) & 0x3F;
+}
+
+static void greth_set_hash_filter(struct net_device *dev)
+{
+       struct dev_mc_list *curr;
+       struct greth_private *greth = (struct greth_private *) netdev_priv(dev);
+       struct greth_regs *regs = (struct greth_regs *) greth->regs;
+       u32 mc_filter[2];
+       unsigned int i, bitnr;
+
+       mc_filter[0] = mc_filter[1] = 0;
+
+       curr = dev->mc_list;
+
+       for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
+
+               if (!curr)
+                       break;  /* unexpected end of list */
+
+               bitnr = greth_hash_get_index(curr->dmi_addr);
+               mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
+       }
+
+       GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
+       GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
+}
+
+static void greth_set_multicast_list(struct net_device *dev)
+{
+       int cfg;
+       struct greth_private *greth = netdev_priv(dev);
+       struct greth_regs *regs = (struct greth_regs *) greth->regs;
+
+       cfg = GRETH_REGLOAD(regs->control);
+       if (dev->flags & IFF_PROMISC)
+               cfg |= GRETH_CTRL_PR;
+       else
+               cfg &= ~GRETH_CTRL_PR;
+
+       if (greth->multicast) {
+               if (dev->flags & IFF_ALLMULTI) {
+                       GRETH_REGSAVE(regs->hash_msb, -1);
+                       GRETH_REGSAVE(regs->hash_lsb, -1);
+                       cfg |= GRETH_CTRL_MCEN;
+                       GRETH_REGSAVE(regs->control, cfg);
+                       return;
+               }
+
+               if (dev->mc_count == 0) {
+                       cfg &= ~GRETH_CTRL_MCEN;
+                       GRETH_REGSAVE(regs->control, cfg);
+                       return;
+               }
+
+               /* Setup multicast filter */
+               greth_set_hash_filter(dev);
+               cfg |= GRETH_CTRL_MCEN;
+       }
+       GRETH_REGSAVE(regs->control, cfg);
+}
+
+static u32 greth_get_msglevel(struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       return greth->msg_enable;
+}
+
+static void greth_set_msglevel(struct net_device *dev, u32 value)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       greth->msg_enable = value;
+}
+static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       struct phy_device *phy = greth->phy;
+
+       if (!phy)
+               return -ENODEV;
+
+       return phy_ethtool_gset(phy, cmd);
+}
+
+static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       struct phy_device *phy = greth->phy;
+
+       if (!phy)
+               return -ENODEV;
+
+       return phy_ethtool_sset(phy, cmd);
+}
+
+static int greth_get_regs_len(struct net_device *dev)
+{
+       return sizeof(struct greth_regs);
+}
+
+static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+       struct greth_private *greth = netdev_priv(dev);
+
+       strncpy(info->driver, dev_driver_string(greth->dev), 32);
+       strncpy(info->version, "revision: 1.0", 32);
+       strncpy(info->bus_info, greth->dev->bus->name, 32);
+       strncpy(info->fw_version, "N/A", 32);
+       info->eedump_len = 0;
+       info->regdump_len = sizeof(struct greth_regs);
+}
+
+static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
+{
+       int i;
+       struct greth_private *greth = netdev_priv(dev);
+       u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
+       u32 *buff = p;
+
+       for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
+               buff[i] = greth_read_bd(&greth_regs[i]);
+}
+
+static u32 greth_get_rx_csum(struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
+}
+
+static int greth_set_rx_csum(struct net_device *dev, u32 data)
+{
+       struct greth_private *greth = netdev_priv(dev);
+
+       spin_lock_bh(&greth->devlock);
+
+       if (data)
+               greth->flags |= GRETH_FLAG_RX_CSUM;
+       else
+               greth->flags &= ~GRETH_FLAG_RX_CSUM;
+
+       spin_unlock_bh(&greth->devlock);
+
+       return 0;
+}
+
+static u32 greth_get_tx_csum(struct net_device *dev)
+{
+       return (dev->features & NETIF_F_IP_CSUM) != 0;
+}
+
+static int greth_set_tx_csum(struct net_device *dev, u32 data)
+{
+       netif_tx_lock_bh(dev);
+       ethtool_op_set_tx_csum(dev, data);
+       netif_tx_unlock_bh(dev);
+       return 0;
+}
+
+static const struct ethtool_ops greth_ethtool_ops = {
+       .get_msglevel           = greth_get_msglevel,
+       .set_msglevel           = greth_set_msglevel,
+       .get_settings           = greth_get_settings,
+       .set_settings           = greth_set_settings,
+       .get_drvinfo            = greth_get_drvinfo,
+       .get_regs_len           = greth_get_regs_len,
+       .get_regs               = greth_get_regs,
+       .get_rx_csum            = greth_get_rx_csum,
+       .set_rx_csum            = greth_set_rx_csum,
+       .get_tx_csum            = greth_get_tx_csum,
+       .set_tx_csum            = greth_set_tx_csum,
+       .get_link               = ethtool_op_get_link,
+};
+
+static struct net_device_ops greth_netdev_ops = {
+       .ndo_open = greth_open,
+       .ndo_stop = greth_close,
+       .ndo_start_xmit = greth_start_xmit,
+       .ndo_set_mac_address = greth_set_mac_add,
+};
+
+static inline int wait_for_mdio(struct greth_private *greth)
+{
+       unsigned long timeout = jiffies + 4*HZ/100;
+       while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
+               if (time_after(jiffies, timeout))
+                       return 0;
+       }
+       return 1;
+}
+
+static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
+{
+       struct greth_private *greth = bus->priv;
+       int data;
+
+       if (!wait_for_mdio(greth))
+               return -EBUSY;
+
+       GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
+
+       if (!wait_for_mdio(greth))
+               return -EBUSY;
+
+       if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
+               data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
+               return data;
+
+       } else {
+               return -1;
+       }
+}
+
+static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
+{
+       struct greth_private *greth = bus->priv;
+
+       if (!wait_for_mdio(greth))
+               return -EBUSY;
+
+       GRETH_REGSAVE(greth->regs->mdio,
+                     ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
+
+       if (!wait_for_mdio(greth))
+               return -EBUSY;
+
+       return 0;
+}
+
+static int greth_mdio_reset(struct mii_bus *bus)
+{
+       return 0;
+}
+
+static void greth_link_change(struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       struct phy_device *phydev = greth->phy;
+       unsigned long flags;
+
+       int status_change = 0;
+
+       spin_lock_irqsave(&greth->devlock, flags);
+
+       if (phydev->link) {
+
+               if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
+
+                       GRETH_REGANDIN(greth->regs->control,
+                                      ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB));
+
+                       if (phydev->duplex)
+                               GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD);
+
+                       if (phydev->speed == SPEED_100) {
+
+                               GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP);
+                       }
+
+                       else if (phydev->speed == SPEED_1000)
+                               GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB);
+
+                       greth->speed = phydev->speed;
+                       greth->duplex = phydev->duplex;
+                       status_change = 1;
+               }
+       }
+
+       if (phydev->link != greth->link) {
+               if (!phydev->link) {
+                       greth->speed = 0;
+                       greth->duplex = -1;
+               }
+               greth->link = phydev->link;
+
+               status_change = 1;
+       }
+
+       spin_unlock_irqrestore(&greth->devlock, flags);
+
+       if (status_change) {
+               if (phydev->link)
+                       pr_debug("%s: link up (%d/%s)\n",
+                               dev->name, phydev->speed,
+                               DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
+               else
+                       pr_debug("%s: link down\n", dev->name);
+       }
+}
+
+static int greth_mdio_probe(struct net_device *dev)
+{
+       struct greth_private *greth = netdev_priv(dev);
+       struct phy_device *phy = NULL;
+       u32 interface;
+       int i;
+
+       /* Find the first PHY */
+       for (i = 0; i < PHY_MAX_ADDR; i++) {
+               if (greth->mdio->phy_map[i]) {
+                       phy = greth->mdio->phy_map[i];
+                       break;
+               }
+       }
+       if (!phy) {
+               if (netif_msg_probe(greth))
+                       dev_err(&dev->dev, "no PHY found\n");
+               return -ENXIO;
+       }
+
+       if (greth->gbit_mac)
+               interface = PHY_INTERFACE_MODE_GMII;
+       else
+               interface = PHY_INTERFACE_MODE_MII;
+
+       phy = phy_connect(dev, dev_name(&phy->dev), &greth_link_change, 0, interface);
+
+       if (greth->gbit_mac)
+               phy->supported &= PHY_GBIT_FEATURES;
+       else
+               phy->supported &= PHY_BASIC_FEATURES;
+
+       phy->advertising = phy->supported;
+
+       if (IS_ERR(phy)) {
+               if (netif_msg_ifup(greth))
+                       dev_err(&dev->dev, "could not attach to PHY\n");
+               return PTR_ERR(phy);
+       }
+
+       greth->link = 0;
+       greth->speed = 0;
+       greth->duplex = -1;
+       greth->phy = phy;
+
+       return 0;
+}
+
+static inline int phy_aneg_done(struct phy_device *phydev)
+{
+       int retval;
+
+       retval = phy_read(phydev, MII_BMSR);
+
+       return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
+}
+
+static int greth_mdio_init(struct greth_private *greth)
+{
+       int ret, phy;
+       unsigned long timeout;
+
+       greth->mdio = mdiobus_alloc();
+       if (!greth->mdio) {
+               return -ENOMEM;
+       }
+
+       greth->mdio->name = "greth-mdio";
+       snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
+       greth->mdio->read = greth_mdio_read;
+       greth->mdio->write = greth_mdio_write;
+       greth->mdio->reset = greth_mdio_reset;
+       greth->mdio->priv = greth;
+
+       greth->mdio->irq = greth->mdio_irqs;
+
+       for (phy = 0; phy < PHY_MAX_ADDR; phy++)
+               greth->mdio->irq[phy] = PHY_POLL;
+
+       ret = mdiobus_register(greth->mdio);
+       if (ret) {
+               goto error;
+       }
+
+       ret = greth_mdio_probe(greth->netdev);
+       if (ret) {
+               if (netif_msg_probe(greth))
+                       dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
+               goto unreg_mdio;
+       }
+
+       phy_start(greth->phy);
+
+       /* If Ethernet debug link is used make autoneg happen right away */
+       if (greth->edcl && greth_edcl == 1) {
+               phy_start_aneg(greth->phy);
+               timeout = jiffies + 6*HZ;
+               while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
+               }
+               genphy_read_status(greth->phy);
+               greth_link_change(greth->netdev);
+       }
+
+       return 0;
+
+unreg_mdio:
+       mdiobus_unregister(greth->mdio);
+error:
+       mdiobus_free(greth->mdio);
+       return ret;
+}
+
+/* Initialize the GRETH MAC */
+static int __devinit greth_of_probe(struct of_device *ofdev, const struct of_device_id *match)
+{
+       struct net_device *dev;
+       struct greth_private *greth;
+       struct greth_regs *regs;
+
+       int i;
+       int err;
+       int tmp;
+       unsigned long timeout;
+
+       dev = alloc_etherdev(sizeof(struct greth_private));
+
+       if (dev == NULL)
+               return -ENOMEM;
+
+       greth = netdev_priv(dev);
+       greth->netdev = dev;
+       greth->dev = &ofdev->dev;
+
+       if (greth_debug > 0)
+               greth->msg_enable = greth_debug;
+       else
+               greth->msg_enable = GRETH_DEF_MSG_ENABLE;
+
+       spin_lock_init(&greth->devlock);
+
+       greth->regs = of_ioremap(&ofdev->resource[0], 0,
+                                resource_size(&ofdev->resource[0]),
+                                "grlib-greth regs");
+
+       if (greth->regs == NULL) {
+               if (netif_msg_probe(greth))
+                       dev_err(greth->dev, "ioremap failure.\n");
+               err = -EIO;
+               goto error1;
+       }
+
+       regs = (struct greth_regs *) greth->regs;
+       greth->irq = ofdev->irqs[0];
+
+       dev_set_drvdata(greth->dev, dev);
+       SET_NETDEV_DEV(dev, greth->dev);
+
+       if (netif_msg_probe(greth))
+               dev_dbg(greth->dev, "reseting controller.\n");
+
+       /* Reset the controller. */
+       GRETH_REGSAVE(regs->control, GRETH_RESET);
+
+       /* Wait for MAC to reset itself */
+       timeout = jiffies + HZ/100;
+       while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
+               if (time_after(jiffies, timeout)) {
+                       err = -EIO;
+                       if (netif_msg_probe(greth))
+                               dev_err(greth->dev, "timeout when waiting for reset.\n");
+                       goto error2;
+               }
+       }
+
+       /* Get default PHY address  */
+       greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
+
+       /* Check if we have GBIT capable MAC */
+       tmp = GRETH_REGLOAD(regs->control);
+       greth->gbit_mac = (tmp >> 27) & 1;
+
+       /* Check for multicast capability */
+       greth->multicast = (tmp >> 25) & 1;
+
+       greth->edcl = (tmp >> 31) & 1;
+
+       /* If we have EDCL we disable the EDCL speed-duplex FSM so
+        * it doesn't interfere with the software */
+       if (greth->edcl != 0)
+               GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
+
+       /* Check if MAC can handle MDIO interrupts */
+       greth->mdio_int_en = (tmp >> 26) & 1;
+
+       err = greth_mdio_init(greth);
+       if (err) {
+               if (netif_msg_probe(greth))
+                       dev_err(greth->dev, "failed to register MDIO bus\n");
+               goto error2;
+       }
+
+       /* Allocate TX descriptor ring in coherent memory */
+       greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
+                                                                  1024,
+                                                                  &greth->tx_bd_base_phys,
+                                                                  GFP_KERNEL);
+
+       if (!greth->tx_bd_base) {
+               if (netif_msg_probe(greth))
+                       dev_err(&dev->dev, "could not allocate descriptor memory.\n");
+               err = -ENOMEM;
+               goto error3;
+       }
+
+       memset(greth->tx_bd_base, 0, 1024);
+
+       /* Allocate RX descriptor ring in coherent memory */
+       greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
+                                                                  1024,
+                                                                  &greth->rx_bd_base_phys,
+                                                                  GFP_KERNEL);
+
+       if (!greth->rx_bd_base) {
+               if (netif_msg_probe(greth))
+                       dev_err(greth->dev, "could not allocate descriptor memory.\n");
+               err = -ENOMEM;
+               goto error4;
+       }
+
+       memset(greth->rx_bd_base, 0, 1024);
+
+       /* Get MAC address from: module param, OF property or ID prom */
+       for (i = 0; i < 6; i++) {
+               if (macaddr[i] != 0)
+                       break;
+       }
+       if (i == 6) {
+               const unsigned char *addr;
+               int len;
+               addr = of_get_property(ofdev->node, "local-mac-address", &len);
+               if (addr != NULL && len == 6) {
+                       for (i = 0; i < 6; i++)
+                               macaddr[i] = (unsigned int) addr[i];
+               } else {
+#ifdef CONFIG_SPARC
+                       for (i = 0; i < 6; i++)
+                               macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
+#endif
+               }
+       }
+
+       for (i = 0; i < 6; i++)
+               dev->dev_addr[i] = macaddr[i];
+
+       macaddr[5]++;
+
+       if (!is_valid_ether_addr(&dev->dev_addr[0])) {
+               if (netif_msg_probe(greth))
+                       dev_err(greth->dev, "no valid ethernet address, aborting.\n");
+               err = -EINVAL;
+               goto error5;
+       }
+
+       GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
+       GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
+                     dev->dev_addr[4] << 8 | dev->dev_addr[5]);
+
+       /* Clear all pending interrupts except PHY irq */
+       GRETH_REGSAVE(regs->status, 0xFF);
+
+       if (greth->gbit_mac) {
+               dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
+               greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
+               greth->flags = GRETH_FLAG_RX_CSUM;
+       }
+
+       if (greth->multicast) {
+               greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
+               dev->flags |= IFF_MULTICAST;
+       } else {
+               dev->flags &= ~IFF_MULTICAST;
+       }
+
+       dev->netdev_ops = &greth_netdev_ops;
+       dev->ethtool_ops = &greth_ethtool_ops;
+
+       if (register_netdev(dev)) {
+               if (netif_msg_probe(greth))
+                       dev_err(greth->dev, "netdevice registration failed.\n");
+               err = -ENOMEM;
+               goto error5;
+       }
+
+       /* setup NAPI */
+       memset(&greth->napi, 0, sizeof(greth->napi));
+       netif_napi_add(dev, &greth->napi, greth_poll, 64);
+
+       return 0;
+
+error5:
+       dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
+error4:
+       dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
+error3:
+       mdiobus_unregister(greth->mdio);
+error2:
+       of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
+error1:
+       free_netdev(dev);
+       return err;
+}
+
+static int __devexit greth_of_remove(struct of_device *of_dev)
+{
+       struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
+       struct greth_private *greth = netdev_priv(ndev);
+
+       /* Free descriptor areas */
+       dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
+
+       dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
+
+       dev_set_drvdata(&of_dev->dev, NULL);
+
+       if (greth->phy)
+               phy_stop(greth->phy);
+       mdiobus_unregister(greth->mdio);
+
+       unregister_netdev(ndev);
+       free_netdev(ndev);
+
+       of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
+
+       return 0;
+}
+
+static struct of_device_id greth_of_match[] = {
+       {
+        .name = "GAISLER_ETHMAC",
+        },
+       {},
+};
+
+MODULE_DEVICE_TABLE(of, greth_of_match);
+
+static struct of_platform_driver greth_of_driver = {
+       .name = "grlib-greth",
+       .match_table = greth_of_match,
+       .probe = greth_of_probe,
+       .remove = __devexit_p(greth_of_remove),
+       .driver = {
+                  .owner = THIS_MODULE,
+                  .name = "grlib-greth",
+                  },
+};
+
+static int __init greth_init(void)
+{
+       return of_register_platform_driver(&greth_of_driver);
+}
+
+static void __exit greth_cleanup(void)
+{
+       of_unregister_platform_driver(&greth_of_driver);
+}
+
+module_init(greth_init);
+module_exit(greth_cleanup);
+
+MODULE_AUTHOR("Aeroflex Gaisler AB.");
+MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/greth.h b/drivers/net/greth.h
new file mode 100644 (file)
index 0000000..973388d
--- /dev/null
@@ -0,0 +1,143 @@
+#ifndef GRETH_H
+#define GRETH_H
+
+#include <linux/phy.h>
+
+/* Register bits and masks */
+#define GRETH_RESET 0x40
+#define GRETH_MII_BUSY 0x8
+#define GRETH_MII_NVALID 0x10
+
+#define GRETH_CTRL_FD         0x10
+#define GRETH_CTRL_PR         0x20
+#define GRETH_CTRL_SP         0x80
+#define GRETH_CTRL_GB         0x100
+#define GRETH_CTRL_PSTATIEN   0x400
+#define GRETH_CTRL_MCEN       0x800
+#define GRETH_CTRL_DISDUPLEX  0x1000
+#define GRETH_STATUS_PHYSTAT  0x100
+
+#define GRETH_BD_EN 0x800
+#define GRETH_BD_WR 0x1000
+#define GRETH_BD_IE 0x2000
+#define GRETH_BD_LEN 0x7FF
+
+#define GRETH_TXEN 0x1
+#define GRETH_INT_TX 0x8
+#define GRETH_TXI 0x4
+#define GRETH_TXBD_STATUS 0x0001C000
+#define GRETH_TXBD_MORE 0x20000
+#define GRETH_TXBD_IPCS 0x40000
+#define GRETH_TXBD_TCPCS 0x80000
+#define GRETH_TXBD_UDPCS 0x100000
+#define GRETH_TXBD_CSALL (GRETH_TXBD_IPCS | GRETH_TXBD_TCPCS | GRETH_TXBD_UDPCS)
+#define GRETH_TXBD_ERR_LC 0x10000
+#define GRETH_TXBD_ERR_UE 0x4000
+#define GRETH_TXBD_ERR_AL 0x8000
+
+#define GRETH_INT_RX         0x4
+#define GRETH_RXEN           0x2
+#define GRETH_RXI            0x8
+#define GRETH_RXBD_STATUS    0xFFFFC000
+#define GRETH_RXBD_ERR_AE    0x4000
+#define GRETH_RXBD_ERR_FT    0x8000
+#define GRETH_RXBD_ERR_CRC   0x10000
+#define GRETH_RXBD_ERR_OE    0x20000
+#define GRETH_RXBD_ERR_LE    0x40000
+#define GRETH_RXBD_IP        0x80000
+#define GRETH_RXBD_IP_CSERR  0x100000
+#define GRETH_RXBD_UDP       0x200000
+#define GRETH_RXBD_UDP_CSERR 0x400000
+#define GRETH_RXBD_TCP       0x800000
+#define GRETH_RXBD_TCP_CSERR 0x1000000
+#define GRETH_RXBD_IP_FRAG   0x2000000
+#define GRETH_RXBD_MCAST     0x4000000
+
+/* Descriptor parameters */
+#define GRETH_TXBD_NUM 128
+#define GRETH_TXBD_NUM_MASK (GRETH_TXBD_NUM-1)
+#define GRETH_TX_BUF_SIZE 2048
+#define GRETH_RXBD_NUM 128
+#define GRETH_RXBD_NUM_MASK (GRETH_RXBD_NUM-1)
+#define GRETH_RX_BUF_SIZE 2048
+
+/* Buffers per page */
+#define GRETH_RX_BUF_PPGAE     (PAGE_SIZE/GRETH_RX_BUF_SIZE)
+#define GRETH_TX_BUF_PPGAE     (PAGE_SIZE/GRETH_TX_BUF_SIZE)
+
+/* How many pages are needed for buffers */
+#define GRETH_RX_BUF_PAGE_NUM  (GRETH_RXBD_NUM/GRETH_RX_BUF_PPGAE)
+#define GRETH_TX_BUF_PAGE_NUM  (GRETH_TXBD_NUM/GRETH_TX_BUF_PPGAE)
+
+/* Buffer size.
+ * Gbit MAC uses tagged maximum frame size which is 1518 excluding CRC.
+ * Set to 1520 to make all buffers word aligned for non-gbit MAC.
+ */
+#define MAX_FRAME_SIZE         1520
+
+/* Flags */
+#define GRETH_FLAG_RX_CSUM 0x1
+
+/* GRETH APB registers */
+struct greth_regs {
+       u32 control;
+       u32 status;
+       u32 esa_msb;
+       u32 esa_lsb;
+       u32 mdio;
+       u32 tx_desc_p;
+       u32 rx_desc_p;
+       u32 edclip;
+       u32 hash_msb;
+       u32 hash_lsb;
+};
+
+/* GRETH buffer descriptor */
+struct greth_bd {
+       u32 stat;
+       u32 addr;
+};
+
+struct greth_private {
+       struct sk_buff *rx_skbuff[GRETH_RXBD_NUM];
+       struct sk_buff *tx_skbuff[GRETH_TXBD_NUM];
+
+       unsigned char *tx_bufs[GRETH_TXBD_NUM];
+       unsigned char *rx_bufs[GRETH_RXBD_NUM];
+
+       u16 tx_next;
+       u16 tx_last;
+       u16 tx_free;
+       u16 rx_cur;
+
+       struct greth_regs *regs;        /* Address of controller registers. */
+       struct greth_bd *rx_bd_base;    /* Address of Rx BDs. */
+       struct greth_bd *tx_bd_base;    /* Address of Tx BDs. */
+       dma_addr_t rx_bd_base_phys;
+       dma_addr_t tx_bd_base_phys;
+
+       int irq;
+
+       struct device *dev;             /* Pointer to of_device->dev */
+       struct net_device *netdev;
+       struct napi_struct napi;
+       spinlock_t devlock;
+
+       struct phy_device *phy;
+       struct mii_bus *mdio;
+       int mdio_irqs[PHY_MAX_ADDR];
+       unsigned int link;
+       unsigned int speed;
+       unsigned int duplex;
+
+       u32 msg_enable;
+       u32 flags;
+
+       u8 phyaddr;
+       u8 multicast;
+       u8 gbit_mac;
+       u8 mdio_int_en;
+       u8 edcl;
+};
+
+#endif