net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller
authorMåns Rullgård <mans@mansr.com>
Thu, 19 Nov 2015 13:02:59 +0000 (13:02 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 20 Nov 2015 16:47:02 +0000 (11:47 -0500)
This adds a driver for the Aurora VLSI NB8800 Ethernet controller.
It is an almost complete rewrite of a driver originally found in
a Sigma Designs 2.6.22 tree.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/Kconfig
drivers/net/ethernet/Makefile
drivers/net/ethernet/aurora/Kconfig [new file with mode: 0644]
drivers/net/ethernet/aurora/Makefile [new file with mode: 0644]
drivers/net/ethernet/aurora/nb8800.c [new file with mode: 0644]
drivers/net/ethernet/aurora/nb8800.h [new file with mode: 0644]

index 955d06b..31c5e47 100644 (file)
@@ -29,6 +29,7 @@ source "drivers/net/ethernet/apm/Kconfig"
 source "drivers/net/ethernet/apple/Kconfig"
 source "drivers/net/ethernet/arc/Kconfig"
 source "drivers/net/ethernet/atheros/Kconfig"
+source "drivers/net/ethernet/aurora/Kconfig"
 source "drivers/net/ethernet/cadence/Kconfig"
 source "drivers/net/ethernet/adi/Kconfig"
 source "drivers/net/ethernet/broadcom/Kconfig"
index 4a2ee98..071f84e 100644 (file)
@@ -15,6 +15,7 @@ obj-$(CONFIG_NET_XGENE) += apm/
 obj-$(CONFIG_NET_VENDOR_APPLE) += apple/
 obj-$(CONFIG_NET_VENDOR_ARC) += arc/
 obj-$(CONFIG_NET_VENDOR_ATHEROS) += atheros/
+obj-$(CONFIG_NET_VENDOR_AURORA) += aurora/
 obj-$(CONFIG_NET_CADENCE) += cadence/
 obj-$(CONFIG_NET_BFIN) += adi/
 obj-$(CONFIG_NET_VENDOR_BROADCOM) += broadcom/
diff --git a/drivers/net/ethernet/aurora/Kconfig b/drivers/net/ethernet/aurora/Kconfig
new file mode 100644 (file)
index 0000000..a3c7106
--- /dev/null
@@ -0,0 +1,20 @@
+config NET_VENDOR_AURORA
+       bool "Aurora VLSI devices"
+       help
+         If you have a network (Ethernet) device belonging to this class,
+         say Y.
+
+         Note that the answer to this question doesn't directly affect the
+         kernel: saying N will just cause the configurator to skip all
+         questions about Aurora devices. If you say Y, you will be asked
+         for your specific device in the following questions.
+
+if NET_VENDOR_AURORA
+
+config AURORA_NB8800
+       tristate "Aurora AU-NB8800 support"
+       select PHYLIB
+       help
+        Support for the AU-NB8800 gigabit Ethernet controller.
+
+endif
diff --git a/drivers/net/ethernet/aurora/Makefile b/drivers/net/ethernet/aurora/Makefile
new file mode 100644 (file)
index 0000000..6cb528a
--- /dev/null
@@ -0,0 +1 @@
+obj-$(CONFIG_AURORA_NB8800) += nb8800.o
diff --git a/drivers/net/ethernet/aurora/nb8800.c b/drivers/net/ethernet/aurora/nb8800.c
new file mode 100644 (file)
index 0000000..ecc4a33
--- /dev/null
@@ -0,0 +1,1552 @@
+/*
+ * Copyright (C) 2015 Mans Rullgard <mans@mansr.com>
+ *
+ * Mostly rewritten, based on driver from Sigma Designs.  Original
+ * copyright notice below.
+ *
+ *
+ * Driver for tangox SMP864x/SMP865x/SMP867x/SMP868x builtin Ethernet Mac.
+ *
+ * Copyright (C) 2005 Maxime Bizon <mbizon@freebox.fr>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <linux/dma-mapping.h>
+#include <linux/phy.h>
+#include <linux/cache.h>
+#include <linux/jiffies.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <asm/barrier.h>
+
+#include "nb8800.h"
+
+static void nb8800_tx_done(struct net_device *dev);
+static int nb8800_dma_stop(struct net_device *dev);
+
+static inline u8 nb8800_readb(struct nb8800_priv *priv, int reg)
+{
+       return readb_relaxed(priv->base + reg);
+}
+
+static inline u32 nb8800_readl(struct nb8800_priv *priv, int reg)
+{
+       return readl_relaxed(priv->base + reg);
+}
+
+static inline void nb8800_writeb(struct nb8800_priv *priv, int reg, u8 val)
+{
+       writeb_relaxed(val, priv->base + reg);
+}
+
+static inline void nb8800_writew(struct nb8800_priv *priv, int reg, u16 val)
+{
+       writew_relaxed(val, priv->base + reg);
+}
+
+static inline void nb8800_writel(struct nb8800_priv *priv, int reg, u32 val)
+{
+       writel_relaxed(val, priv->base + reg);
+}
+
+static inline void nb8800_maskb(struct nb8800_priv *priv, int reg,
+                               u32 mask, u32 val)
+{
+       u32 old = nb8800_readb(priv, reg);
+       u32 new = (old & ~mask) | (val & mask);
+
+       if (new != old)
+               nb8800_writeb(priv, reg, new);
+}
+
+static inline void nb8800_maskl(struct nb8800_priv *priv, int reg,
+                               u32 mask, u32 val)
+{
+       u32 old = nb8800_readl(priv, reg);
+       u32 new = (old & ~mask) | (val & mask);
+
+       if (new != old)
+               nb8800_writel(priv, reg, new);
+}
+
+static inline void nb8800_modb(struct nb8800_priv *priv, int reg, u8 bits,
+                              bool set)
+{
+       nb8800_maskb(priv, reg, bits, set ? bits : 0);
+}
+
+static inline void nb8800_setb(struct nb8800_priv *priv, int reg, u8 bits)
+{
+       nb8800_maskb(priv, reg, bits, bits);
+}
+
+static inline void nb8800_clearb(struct nb8800_priv *priv, int reg, u8 bits)
+{
+       nb8800_maskb(priv, reg, bits, 0);
+}
+
+static inline void nb8800_modl(struct nb8800_priv *priv, int reg, u32 bits,
+                              bool set)
+{
+       nb8800_maskl(priv, reg, bits, set ? bits : 0);
+}
+
+static inline void nb8800_setl(struct nb8800_priv *priv, int reg, u32 bits)
+{
+       nb8800_maskl(priv, reg, bits, bits);
+}
+
+static inline void nb8800_clearl(struct nb8800_priv *priv, int reg, u32 bits)
+{
+       nb8800_maskl(priv, reg, bits, 0);
+}
+
+static int nb8800_mdio_wait(struct mii_bus *bus)
+{
+       struct nb8800_priv *priv = bus->priv;
+       u32 val;
+
+       return readl_poll_timeout_atomic(priv->base + NB8800_MDIO_CMD,
+                                        val, !(val & MDIO_CMD_GO), 1, 1000);
+}
+
+static int nb8800_mdio_cmd(struct mii_bus *bus, u32 cmd)
+{
+       struct nb8800_priv *priv = bus->priv;
+       int err;
+
+       err = nb8800_mdio_wait(bus);
+       if (err)
+               return err;
+
+       nb8800_writel(priv, NB8800_MDIO_CMD, cmd);
+       udelay(10);
+       nb8800_writel(priv, NB8800_MDIO_CMD, cmd | MDIO_CMD_GO);
+
+       return nb8800_mdio_wait(bus);
+}
+
+static int nb8800_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+       struct nb8800_priv *priv = bus->priv;
+       u32 val;
+       int err;
+
+       err = nb8800_mdio_cmd(bus, MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg));
+       if (err)
+               return err;
+
+       val = nb8800_readl(priv, NB8800_MDIO_STS);
+       if (val & MDIO_STS_ERR)
+               return 0xffff;
+
+       return val & 0xffff;
+}
+
+static int nb8800_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
+{
+       u32 cmd = MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg) |
+               MDIO_CMD_DATA(val) | MDIO_CMD_WR;
+
+       return nb8800_mdio_cmd(bus, cmd);
+}
+
+static void nb8800_mac_tx(struct net_device *dev, bool enable)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       while (nb8800_readl(priv, NB8800_TXC_CR) & TCR_EN)
+               cpu_relax();
+
+       nb8800_modb(priv, NB8800_TX_CTL1, TX_EN, enable);
+}
+
+static void nb8800_mac_rx(struct net_device *dev, bool enable)
+{
+       nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_EN, enable);
+}
+
+static void nb8800_mac_af(struct net_device *dev, bool enable)
+{
+       nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_AF_EN, enable);
+}
+
+static void nb8800_start_rx(struct net_device *dev)
+{
+       nb8800_setl(netdev_priv(dev), NB8800_RXC_CR, RCR_EN);
+}
+
+static int nb8800_alloc_rx(struct net_device *dev, unsigned int i, bool napi)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_rx_desc *rxd = &priv->rx_descs[i];
+       struct nb8800_rx_buf *rxb = &priv->rx_bufs[i];
+       int size = L1_CACHE_ALIGN(RX_BUF_SIZE);
+       dma_addr_t dma_addr;
+       struct page *page;
+       unsigned long offset;
+       void *data;
+
+       data = napi ? napi_alloc_frag(size) : netdev_alloc_frag(size);
+       if (!data)
+               return -ENOMEM;
+
+       page = virt_to_head_page(data);
+       offset = data - page_address(page);
+
+       dma_addr = dma_map_page(&dev->dev, page, offset, RX_BUF_SIZE,
+                               DMA_FROM_DEVICE);
+
+       if (dma_mapping_error(&dev->dev, dma_addr)) {
+               skb_free_frag(data);
+               return -ENOMEM;
+       }
+
+       rxb->page = page;
+       rxb->offset = offset;
+       rxd->desc.s_addr = dma_addr;
+
+       return 0;
+}
+
+static void nb8800_receive(struct net_device *dev, unsigned int i,
+                          unsigned int len)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_rx_desc *rxd = &priv->rx_descs[i];
+       struct page *page = priv->rx_bufs[i].page;
+       int offset = priv->rx_bufs[i].offset;
+       void *data = page_address(page) + offset;
+       dma_addr_t dma = rxd->desc.s_addr;
+       struct sk_buff *skb;
+       unsigned int size;
+       int err;
+
+       size = len <= RX_COPYBREAK ? len : RX_COPYHDR;
+
+       skb = napi_alloc_skb(&priv->napi, size);
+       if (!skb) {
+               netdev_err(dev, "rx skb allocation failed\n");
+               dev->stats.rx_dropped++;
+               return;
+       }
+
+       if (len <= RX_COPYBREAK) {
+               dma_sync_single_for_cpu(&dev->dev, dma, len, DMA_FROM_DEVICE);
+               memcpy(skb_put(skb, len), data, len);
+               dma_sync_single_for_device(&dev->dev, dma, len,
+                                          DMA_FROM_DEVICE);
+       } else {
+               err = nb8800_alloc_rx(dev, i, true);
+               if (err) {
+                       netdev_err(dev, "rx buffer allocation failed\n");
+                       dev->stats.rx_dropped++;
+                       return;
+               }
+
+               dma_unmap_page(&dev->dev, dma, RX_BUF_SIZE, DMA_FROM_DEVICE);
+               memcpy(skb_put(skb, RX_COPYHDR), data, RX_COPYHDR);
+               skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
+                               offset + RX_COPYHDR, len - RX_COPYHDR,
+                               RX_BUF_SIZE);
+       }
+
+       skb->protocol = eth_type_trans(skb, dev);
+       napi_gro_receive(&priv->napi, skb);
+}
+
+static void nb8800_rx_error(struct net_device *dev, u32 report)
+{
+       if (report & RX_LENGTH_ERR)
+               dev->stats.rx_length_errors++;
+
+       if (report & RX_FCS_ERR)
+               dev->stats.rx_crc_errors++;
+
+       if (report & RX_FIFO_OVERRUN)
+               dev->stats.rx_fifo_errors++;
+
+       if (report & RX_ALIGNMENT_ERROR)
+               dev->stats.rx_frame_errors++;
+
+       dev->stats.rx_errors++;
+}
+
+static int nb8800_poll(struct napi_struct *napi, int budget)
+{
+       struct net_device *dev = napi->dev;
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_rx_desc *rxd;
+       unsigned int last = priv->rx_eoc;
+       unsigned int next;
+       int work = 0;
+
+       nb8800_tx_done(dev);
+
+again:
+       while (work < budget) {
+               struct nb8800_rx_buf *rxb;
+               unsigned int len;
+
+               next = (last + 1) % RX_DESC_COUNT;
+
+               rxb = &priv->rx_bufs[next];
+               rxd = &priv->rx_descs[next];
+
+               if (!rxd->report)
+                       break;
+
+               len = RX_BYTES_TRANSFERRED(rxd->report);
+
+               if (IS_RX_ERROR(rxd->report))
+                       nb8800_rx_error(dev, rxd->report);
+               else
+                       nb8800_receive(dev, next, len);
+
+               dev->stats.rx_packets++;
+               dev->stats.rx_bytes += len;
+
+               if (rxd->report & RX_MULTICAST_PKT)
+                       dev->stats.multicast++;
+
+               rxd->report = 0;
+               last = next;
+               work++;
+       }
+
+       if (work) {
+               priv->rx_descs[last].desc.config |= DESC_EOC;
+               wmb();  /* ensure new EOC is written before clearing old */
+               priv->rx_descs[priv->rx_eoc].desc.config &= ~DESC_EOC;
+               priv->rx_eoc = last;
+               nb8800_start_rx(dev);
+       }
+
+       if (work < budget) {
+               nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq);
+
+               /* If a packet arrived after we last checked but
+                * before writing RX_ITR, the interrupt will be
+                * delayed, so we retrieve it now.
+                */
+               if (priv->rx_descs[next].report)
+                       goto again;
+
+               napi_complete_done(napi, work);
+       }
+
+       return work;
+}
+
+static void __nb8800_tx_dma_start(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_tx_buf *txb;
+       u32 txc_cr;
+
+       txb = &priv->tx_bufs[priv->tx_queue];
+       if (!txb->ready)
+               return;
+
+       txc_cr = nb8800_readl(priv, NB8800_TXC_CR);
+       if (txc_cr & TCR_EN)
+               return;
+
+       nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc);
+       wmb();          /* ensure desc addr is written before starting DMA */
+       nb8800_writel(priv, NB8800_TXC_CR, txc_cr | TCR_EN);
+
+       priv->tx_queue = (priv->tx_queue + txb->chain_len) % TX_DESC_COUNT;
+}
+
+static void nb8800_tx_dma_start(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       spin_lock_irq(&priv->tx_lock);
+       __nb8800_tx_dma_start(dev);
+       spin_unlock_irq(&priv->tx_lock);
+}
+
+static void nb8800_tx_dma_start_irq(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       spin_lock(&priv->tx_lock);
+       __nb8800_tx_dma_start(dev);
+       spin_unlock(&priv->tx_lock);
+}
+
+static int nb8800_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_tx_desc *txd;
+       struct nb8800_tx_buf *txb;
+       struct nb8800_dma_desc *desc;
+       dma_addr_t dma_addr;
+       unsigned int dma_len;
+       unsigned int align;
+       unsigned int next;
+
+       if (atomic_read(&priv->tx_free) <= NB8800_DESC_LOW) {
+               netif_stop_queue(dev);
+               return NETDEV_TX_BUSY;
+       }
+
+       align = (8 - (uintptr_t)skb->data) & 7;
+
+       dma_len = skb->len - align;
+       dma_addr = dma_map_single(&dev->dev, skb->data + align,
+                                 dma_len, DMA_TO_DEVICE);
+
+       if (dma_mapping_error(&dev->dev, dma_addr)) {
+               netdev_err(dev, "tx dma mapping error\n");
+               kfree_skb(skb);
+               dev->stats.tx_dropped++;
+               return NETDEV_TX_OK;
+       }
+
+       if (atomic_dec_return(&priv->tx_free) <= NB8800_DESC_LOW) {
+               netif_stop_queue(dev);
+               skb->xmit_more = 0;
+       }
+
+       next = priv->tx_next;
+       txb = &priv->tx_bufs[next];
+       txd = &priv->tx_descs[next];
+       desc = &txd->desc[0];
+
+       next = (next + 1) % TX_DESC_COUNT;
+
+       if (align) {
+               memcpy(txd->buf, skb->data, align);
+
+               desc->s_addr =
+                       txb->dma_desc + offsetof(struct nb8800_tx_desc, buf);
+               desc->n_addr = txb->dma_desc + sizeof(txd->desc[0]);
+               desc->config = DESC_BTS(2) | DESC_DS | align;
+
+               desc++;
+       }
+
+       desc->s_addr = dma_addr;
+       desc->n_addr = priv->tx_bufs[next].dma_desc;
+       desc->config = DESC_BTS(2) | DESC_DS | DESC_EOF | dma_len;
+
+       if (!skb->xmit_more)
+               desc->config |= DESC_EOC;
+
+       txb->skb = skb;
+       txb->dma_addr = dma_addr;
+       txb->dma_len = dma_len;
+
+       if (!priv->tx_chain) {
+               txb->chain_len = 1;
+               priv->tx_chain = txb;
+       } else {
+               priv->tx_chain->chain_len++;
+       }
+
+       netdev_sent_queue(dev, skb->len);
+
+       priv->tx_next = next;
+
+       if (!skb->xmit_more) {
+               smp_wmb();
+               priv->tx_chain->ready = true;
+               priv->tx_chain = NULL;
+               nb8800_tx_dma_start(dev);
+       }
+
+       return NETDEV_TX_OK;
+}
+
+static void nb8800_tx_error(struct net_device *dev, u32 report)
+{
+       if (report & TX_LATE_COLLISION)
+               dev->stats.collisions++;
+
+       if (report & TX_PACKET_DROPPED)
+               dev->stats.tx_dropped++;
+
+       if (report & TX_FIFO_UNDERRUN)
+               dev->stats.tx_fifo_errors++;
+
+       dev->stats.tx_errors++;
+}
+
+static void nb8800_tx_done(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       unsigned int limit = priv->tx_next;
+       unsigned int done = priv->tx_done;
+       unsigned int packets = 0;
+       unsigned int len = 0;
+
+       while (done != limit) {
+               struct nb8800_tx_desc *txd = &priv->tx_descs[done];
+               struct nb8800_tx_buf *txb = &priv->tx_bufs[done];
+               struct sk_buff *skb;
+
+               if (!txd->report)
+                       break;
+
+               skb = txb->skb;
+               len += skb->len;
+
+               dma_unmap_single(&dev->dev, txb->dma_addr, txb->dma_len,
+                                DMA_TO_DEVICE);
+
+               if (IS_TX_ERROR(txd->report)) {
+                       nb8800_tx_error(dev, txd->report);
+                       kfree_skb(skb);
+               } else {
+                       consume_skb(skb);
+               }
+
+               dev->stats.tx_packets++;
+               dev->stats.tx_bytes += TX_BYTES_TRANSFERRED(txd->report);
+               dev->stats.collisions += TX_EARLY_COLLISIONS(txd->report);
+
+               txb->skb = NULL;
+               txb->ready = false;
+               txd->report = 0;
+
+               done = (done + 1) % TX_DESC_COUNT;
+               packets++;
+       }
+
+       if (packets) {
+               smp_mb__before_atomic();
+               atomic_add(packets, &priv->tx_free);
+               netdev_completed_queue(dev, packets, len);
+               netif_wake_queue(dev);
+               priv->tx_done = done;
+       }
+}
+
+static irqreturn_t nb8800_irq(int irq, void *dev_id)
+{
+       struct net_device *dev = dev_id;
+       struct nb8800_priv *priv = netdev_priv(dev);
+       irqreturn_t ret = IRQ_NONE;
+       u32 val;
+
+       /* tx interrupt */
+       val = nb8800_readl(priv, NB8800_TXC_SR);
+       if (val) {
+               nb8800_writel(priv, NB8800_TXC_SR, val);
+
+               if (val & TSR_DI)
+                       nb8800_tx_dma_start_irq(dev);
+
+               if (val & TSR_TI)
+                       napi_schedule_irqoff(&priv->napi);
+
+               if (unlikely(val & TSR_DE))
+                       netdev_err(dev, "TX DMA error\n");
+
+               /* should never happen with automatic status retrieval */
+               if (unlikely(val & TSR_TO))
+                       netdev_err(dev, "TX Status FIFO overflow\n");
+
+               ret = IRQ_HANDLED;
+       }
+
+       /* rx interrupt */
+       val = nb8800_readl(priv, NB8800_RXC_SR);
+       if (val) {
+               nb8800_writel(priv, NB8800_RXC_SR, val);
+
+               if (likely(val & (RSR_RI | RSR_DI))) {
+                       nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_poll);
+                       napi_schedule_irqoff(&priv->napi);
+               }
+
+               if (unlikely(val & RSR_DE))
+                       netdev_err(dev, "RX DMA error\n");
+
+               /* should never happen with automatic status retrieval */
+               if (unlikely(val & RSR_RO))
+                       netdev_err(dev, "RX Status FIFO overflow\n");
+
+               ret = IRQ_HANDLED;
+       }
+
+       return ret;
+}
+
+static void nb8800_mac_config(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       bool gigabit = priv->speed == SPEED_1000;
+       u32 mac_mode_mask = RGMII_MODE | HALF_DUPLEX | GMAC_MODE;
+       u32 mac_mode = 0;
+       u32 slot_time;
+       u32 phy_clk;
+       u32 ict;
+
+       if (!priv->duplex)
+               mac_mode |= HALF_DUPLEX;
+
+       if (gigabit) {
+               if (priv->phy_mode == PHY_INTERFACE_MODE_RGMII)
+                       mac_mode |= RGMII_MODE;
+
+               mac_mode |= GMAC_MODE;
+               phy_clk = 125000000;
+
+               /* Should be 512 but register is only 8 bits */
+               slot_time = 255;
+       } else {
+               phy_clk = 25000000;
+               slot_time = 128;
+       }
+
+       ict = DIV_ROUND_UP(phy_clk, clk_get_rate(priv->clk));
+
+       nb8800_writeb(priv, NB8800_IC_THRESHOLD, ict);
+       nb8800_writeb(priv, NB8800_SLOT_TIME, slot_time);
+       nb8800_maskb(priv, NB8800_MAC_MODE, mac_mode_mask, mac_mode);
+}
+
+static void nb8800_pause_config(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct phy_device *phydev = priv->phydev;
+       u32 rxcr;
+
+       if (priv->pause_aneg) {
+               if (!phydev || !phydev->link)
+                       return;
+
+               priv->pause_rx = phydev->pause;
+               priv->pause_tx = phydev->pause ^ phydev->asym_pause;
+       }
+
+       nb8800_modb(priv, NB8800_RX_CTL, RX_PAUSE_EN, priv->pause_rx);
+
+       rxcr = nb8800_readl(priv, NB8800_RXC_CR);
+       if (!!(rxcr & RCR_FL) == priv->pause_tx)
+               return;
+
+       if (netif_running(dev)) {
+               napi_disable(&priv->napi);
+               netif_tx_lock_bh(dev);
+               nb8800_dma_stop(dev);
+               nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx);
+               nb8800_start_rx(dev);
+               netif_tx_unlock_bh(dev);
+               napi_enable(&priv->napi);
+       } else {
+               nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx);
+       }
+}
+
+static void nb8800_link_reconfigure(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct phy_device *phydev = priv->phydev;
+       int change = 0;
+
+       if (phydev->link) {
+               if (phydev->speed != priv->speed) {
+                       priv->speed = phydev->speed;
+                       change = 1;
+               }
+
+               if (phydev->duplex != priv->duplex) {
+                       priv->duplex = phydev->duplex;
+                       change = 1;
+               }
+
+               if (change)
+                       nb8800_mac_config(dev);
+
+               nb8800_pause_config(dev);
+       }
+
+       if (phydev->link != priv->link) {
+               priv->link = phydev->link;
+               change = 1;
+       }
+
+       if (change)
+               phy_print_status(priv->phydev);
+}
+
+static void nb8800_update_mac_addr(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       int i;
+
+       for (i = 0; i < ETH_ALEN; i++)
+               nb8800_writeb(priv, NB8800_SRC_ADDR(i), dev->dev_addr[i]);
+
+       for (i = 0; i < ETH_ALEN; i++)
+               nb8800_writeb(priv, NB8800_UC_ADDR(i), dev->dev_addr[i]);
+}
+
+static int nb8800_set_mac_address(struct net_device *dev, void *addr)
+{
+       struct sockaddr *sock = addr;
+
+       if (netif_running(dev))
+               return -EBUSY;
+
+       ether_addr_copy(dev->dev_addr, sock->sa_data);
+       nb8800_update_mac_addr(dev);
+
+       return 0;
+}
+
+static void nb8800_mc_init(struct net_device *dev, int val)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       nb8800_writeb(priv, NB8800_MC_INIT, val);
+       readb_poll_timeout_atomic(priv->base + NB8800_MC_INIT, val, !val,
+                                 1, 1000);
+}
+
+static void nb8800_set_rx_mode(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct netdev_hw_addr *ha;
+       int i;
+
+       if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
+               nb8800_mac_af(dev, false);
+               return;
+       }
+
+       nb8800_mac_af(dev, true);
+       nb8800_mc_init(dev, 0);
+
+       netdev_for_each_mc_addr(ha, dev) {
+               for (i = 0; i < ETH_ALEN; i++)
+                       nb8800_writeb(priv, NB8800_MC_ADDR(i), ha->addr[i]);
+
+               nb8800_mc_init(dev, 0xff);
+       }
+}
+
+#define RX_DESC_SIZE (RX_DESC_COUNT * sizeof(struct nb8800_rx_desc))
+#define TX_DESC_SIZE (TX_DESC_COUNT * sizeof(struct nb8800_tx_desc))
+
+static void nb8800_dma_free(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       unsigned int i;
+
+       if (priv->rx_bufs) {
+               for (i = 0; i < RX_DESC_COUNT; i++)
+                       if (priv->rx_bufs[i].page)
+                               put_page(priv->rx_bufs[i].page);
+
+               kfree(priv->rx_bufs);
+               priv->rx_bufs = NULL;
+       }
+
+       if (priv->tx_bufs) {
+               for (i = 0; i < TX_DESC_COUNT; i++)
+                       kfree_skb(priv->tx_bufs[i].skb);
+
+               kfree(priv->tx_bufs);
+               priv->tx_bufs = NULL;
+       }
+
+       if (priv->rx_descs) {
+               dma_free_coherent(dev->dev.parent, RX_DESC_SIZE, priv->rx_descs,
+                                 priv->rx_desc_dma);
+               priv->rx_descs = NULL;
+       }
+
+       if (priv->tx_descs) {
+               dma_free_coherent(dev->dev.parent, TX_DESC_SIZE, priv->tx_descs,
+                                 priv->tx_desc_dma);
+               priv->tx_descs = NULL;
+       }
+}
+
+static void nb8800_dma_reset(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_rx_desc *rxd;
+       struct nb8800_tx_desc *txd;
+       unsigned int i;
+
+       for (i = 0; i < RX_DESC_COUNT; i++) {
+               dma_addr_t rx_dma = priv->rx_desc_dma + i * sizeof(*rxd);
+
+               rxd = &priv->rx_descs[i];
+               rxd->desc.n_addr = rx_dma + sizeof(*rxd);
+               rxd->desc.r_addr =
+                       rx_dma + offsetof(struct nb8800_rx_desc, report);
+               rxd->desc.config = priv->rx_dma_config;
+               rxd->report = 0;
+       }
+
+       rxd->desc.n_addr = priv->rx_desc_dma;
+       rxd->desc.config |= DESC_EOC;
+
+       priv->rx_eoc = RX_DESC_COUNT - 1;
+
+       for (i = 0; i < TX_DESC_COUNT; i++) {
+               struct nb8800_tx_buf *txb = &priv->tx_bufs[i];
+               dma_addr_t r_dma = txb->dma_desc +
+                       offsetof(struct nb8800_tx_desc, report);
+
+               txd = &priv->tx_descs[i];
+               txd->desc[0].r_addr = r_dma;
+               txd->desc[1].r_addr = r_dma;
+               txd->report = 0;
+       }
+
+       priv->tx_next = 0;
+       priv->tx_queue = 0;
+       priv->tx_done = 0;
+       atomic_set(&priv->tx_free, TX_DESC_COUNT);
+
+       nb8800_writel(priv, NB8800_RX_DESC_ADDR, priv->rx_desc_dma);
+
+       wmb();          /* ensure all setup is written before starting */
+}
+
+static int nb8800_dma_init(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       unsigned int n_rx = RX_DESC_COUNT;
+       unsigned int n_tx = TX_DESC_COUNT;
+       unsigned int i;
+       int err;
+
+       priv->rx_descs = dma_alloc_coherent(dev->dev.parent, RX_DESC_SIZE,
+                                           &priv->rx_desc_dma, GFP_KERNEL);
+       if (!priv->rx_descs)
+               goto err_out;
+
+       priv->rx_bufs = kcalloc(n_rx, sizeof(*priv->rx_bufs), GFP_KERNEL);
+       if (!priv->rx_bufs)
+               goto err_out;
+
+       for (i = 0; i < n_rx; i++) {
+               err = nb8800_alloc_rx(dev, i, false);
+               if (err)
+                       goto err_out;
+       }
+
+       priv->tx_descs = dma_alloc_coherent(dev->dev.parent, TX_DESC_SIZE,
+                                           &priv->tx_desc_dma, GFP_KERNEL);
+       if (!priv->tx_descs)
+               goto err_out;
+
+       priv->tx_bufs = kcalloc(n_tx, sizeof(*priv->tx_bufs), GFP_KERNEL);
+       if (!priv->tx_bufs)
+               goto err_out;
+
+       for (i = 0; i < n_tx; i++)
+               priv->tx_bufs[i].dma_desc =
+                       priv->tx_desc_dma + i * sizeof(struct nb8800_tx_desc);
+
+       nb8800_dma_reset(dev);
+
+       return 0;
+
+err_out:
+       nb8800_dma_free(dev);
+
+       return -ENOMEM;
+}
+
+static int nb8800_dma_stop(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       struct nb8800_tx_buf *txb = &priv->tx_bufs[0];
+       struct nb8800_tx_desc *txd = &priv->tx_descs[0];
+       int retry = 5;
+       u32 txcr;
+       u32 rxcr;
+       int err;
+       unsigned int i;
+
+       /* wait for tx to finish */
+       err = readl_poll_timeout_atomic(priv->base + NB8800_TXC_CR, txcr,
+                                       !(txcr & TCR_EN) &&
+                                       priv->tx_done == priv->tx_next,
+                                       1000, 1000000);
+       if (err)
+               return err;
+
+       /* The rx DMA only stops if it reaches the end of chain.
+        * To make this happen, we set the EOC flag on all rx
+        * descriptors, put the device in loopback mode, and send
+        * a few dummy frames.  The interrupt handler will ignore
+        * these since NAPI is disabled and no real frames are in
+        * the tx queue.
+        */
+
+       for (i = 0; i < RX_DESC_COUNT; i++)
+               priv->rx_descs[i].desc.config |= DESC_EOC;
+
+       txd->desc[0].s_addr =
+               txb->dma_desc + offsetof(struct nb8800_tx_desc, buf);
+       txd->desc[0].config = DESC_BTS(2) | DESC_DS | DESC_EOF | DESC_EOC | 8;
+       memset(txd->buf, 0, sizeof(txd->buf));
+
+       nb8800_mac_af(dev, false);
+       nb8800_setb(priv, NB8800_MAC_MODE, LOOPBACK_EN);
+
+       do {
+               nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc);
+               wmb();
+               nb8800_writel(priv, NB8800_TXC_CR, txcr | TCR_EN);
+
+               err = readl_poll_timeout_atomic(priv->base + NB8800_RXC_CR,
+                                               rxcr, !(rxcr & RCR_EN),
+                                               1000, 100000);
+       } while (err && --retry);
+
+       nb8800_mac_af(dev, true);
+       nb8800_clearb(priv, NB8800_MAC_MODE, LOOPBACK_EN);
+       nb8800_dma_reset(dev);
+
+       return retry ? 0 : -ETIMEDOUT;
+}
+
+static void nb8800_pause_adv(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       u32 adv = 0;
+
+       if (!priv->phydev)
+               return;
+
+       if (priv->pause_rx)
+               adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
+       if (priv->pause_tx)
+               adv ^= ADVERTISED_Asym_Pause;
+
+       priv->phydev->supported |= adv;
+       priv->phydev->advertising |= adv;
+}
+
+static int nb8800_open(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       int err;
+
+       /* clear any pending interrupts */
+       nb8800_writel(priv, NB8800_RXC_SR, 0xf);
+       nb8800_writel(priv, NB8800_TXC_SR, 0xf);
+
+       err = nb8800_dma_init(dev);
+       if (err)
+               return err;
+
+       err = request_irq(dev->irq, nb8800_irq, 0, dev_name(&dev->dev), dev);
+       if (err)
+               goto err_free_dma;
+
+       nb8800_mac_rx(dev, true);
+       nb8800_mac_tx(dev, true);
+
+       priv->phydev = of_phy_connect(dev, priv->phy_node,
+                                     nb8800_link_reconfigure, 0,
+                                     priv->phy_mode);
+       if (!priv->phydev)
+               goto err_free_irq;
+
+       nb8800_pause_adv(dev);
+
+       netdev_reset_queue(dev);
+       napi_enable(&priv->napi);
+       netif_start_queue(dev);
+
+       nb8800_start_rx(dev);
+       phy_start(priv->phydev);
+
+       return 0;
+
+err_free_irq:
+       free_irq(dev->irq, dev);
+err_free_dma:
+       nb8800_dma_free(dev);
+
+       return err;
+}
+
+static int nb8800_stop(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       phy_stop(priv->phydev);
+
+       netif_stop_queue(dev);
+       napi_disable(&priv->napi);
+
+       nb8800_dma_stop(dev);
+       nb8800_mac_rx(dev, false);
+       nb8800_mac_tx(dev, false);
+
+       phy_disconnect(priv->phydev);
+       priv->phydev = NULL;
+
+       free_irq(dev->irq, dev);
+
+       nb8800_dma_free(dev);
+
+       return 0;
+}
+
+static int nb8800_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       return phy_mii_ioctl(priv->phydev, rq, cmd);
+}
+
+static const struct net_device_ops nb8800_netdev_ops = {
+       .ndo_open               = nb8800_open,
+       .ndo_stop               = nb8800_stop,
+       .ndo_start_xmit         = nb8800_xmit,
+       .ndo_set_mac_address    = nb8800_set_mac_address,
+       .ndo_set_rx_mode        = nb8800_set_rx_mode,
+       .ndo_do_ioctl           = nb8800_ioctl,
+       .ndo_change_mtu         = eth_change_mtu,
+       .ndo_validate_addr      = eth_validate_addr,
+};
+
+static int nb8800_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       if (!priv->phydev)
+               return -ENODEV;
+
+       return phy_ethtool_gset(priv->phydev, cmd);
+}
+
+static int nb8800_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       if (!priv->phydev)
+               return -ENODEV;
+
+       return phy_ethtool_sset(priv->phydev, cmd);
+}
+
+static int nb8800_nway_reset(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       if (!priv->phydev)
+               return -ENODEV;
+
+       return genphy_restart_aneg(priv->phydev);
+}
+
+static void nb8800_get_pauseparam(struct net_device *dev,
+                                 struct ethtool_pauseparam *pp)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       pp->autoneg = priv->pause_aneg;
+       pp->rx_pause = priv->pause_rx;
+       pp->tx_pause = priv->pause_tx;
+}
+
+static int nb8800_set_pauseparam(struct net_device *dev,
+                                struct ethtool_pauseparam *pp)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       priv->pause_aneg = pp->autoneg;
+       priv->pause_rx = pp->rx_pause;
+       priv->pause_tx = pp->tx_pause;
+
+       nb8800_pause_adv(dev);
+
+       if (!priv->pause_aneg)
+               nb8800_pause_config(dev);
+       else if (priv->phydev)
+               phy_start_aneg(priv->phydev);
+
+       return 0;
+}
+
+static const char nb8800_stats_names[][ETH_GSTRING_LEN] = {
+       "rx_bytes_ok",
+       "rx_frames_ok",
+       "rx_undersize_frames",
+       "rx_fragment_frames",
+       "rx_64_byte_frames",
+       "rx_127_byte_frames",
+       "rx_255_byte_frames",
+       "rx_511_byte_frames",
+       "rx_1023_byte_frames",
+       "rx_max_size_frames",
+       "rx_oversize_frames",
+       "rx_bad_fcs_frames",
+       "rx_broadcast_frames",
+       "rx_multicast_frames",
+       "rx_control_frames",
+       "rx_pause_frames",
+       "rx_unsup_control_frames",
+       "rx_align_error_frames",
+       "rx_overrun_frames",
+       "rx_jabber_frames",
+       "rx_bytes",
+       "rx_frames",
+
+       "tx_bytes_ok",
+       "tx_frames_ok",
+       "tx_64_byte_frames",
+       "tx_127_byte_frames",
+       "tx_255_byte_frames",
+       "tx_511_byte_frames",
+       "tx_1023_byte_frames",
+       "tx_max_size_frames",
+       "tx_oversize_frames",
+       "tx_broadcast_frames",
+       "tx_multicast_frames",
+       "tx_control_frames",
+       "tx_pause_frames",
+       "tx_underrun_frames",
+       "tx_single_collision_frames",
+       "tx_multi_collision_frames",
+       "tx_deferred_collision_frames",
+       "tx_late_collision_frames",
+       "tx_excessive_collision_frames",
+       "tx_bytes",
+       "tx_frames",
+       "tx_collisions",
+};
+
+#define NB8800_NUM_STATS ARRAY_SIZE(nb8800_stats_names)
+
+static int nb8800_get_sset_count(struct net_device *dev, int sset)
+{
+       if (sset == ETH_SS_STATS)
+               return NB8800_NUM_STATS;
+
+       return -EOPNOTSUPP;
+}
+
+static void nb8800_get_strings(struct net_device *dev, u32 sset, u8 *buf)
+{
+       if (sset == ETH_SS_STATS)
+               memcpy(buf, &nb8800_stats_names, sizeof(nb8800_stats_names));
+}
+
+static u32 nb8800_read_stat(struct net_device *dev, int index)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+
+       nb8800_writeb(priv, NB8800_STAT_INDEX, index);
+
+       return nb8800_readl(priv, NB8800_STAT_DATA);
+}
+
+static void nb8800_get_ethtool_stats(struct net_device *dev,
+                                    struct ethtool_stats *estats, u64 *st)
+{
+       unsigned int i;
+       u32 rx, tx;
+
+       for (i = 0; i < NB8800_NUM_STATS / 2; i++) {
+               rx = nb8800_read_stat(dev, i);
+               tx = nb8800_read_stat(dev, i | 0x80);
+               st[i] = rx;
+               st[i + NB8800_NUM_STATS / 2] = tx;
+       }
+}
+
+static const struct ethtool_ops nb8800_ethtool_ops = {
+       .get_settings           = nb8800_get_settings,
+       .set_settings           = nb8800_set_settings,
+       .nway_reset             = nb8800_nway_reset,
+       .get_link               = ethtool_op_get_link,
+       .get_pauseparam         = nb8800_get_pauseparam,
+       .set_pauseparam         = nb8800_set_pauseparam,
+       .get_sset_count         = nb8800_get_sset_count,
+       .get_strings            = nb8800_get_strings,
+       .get_ethtool_stats      = nb8800_get_ethtool_stats,
+};
+
+static int nb8800_hw_init(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       u32 val;
+
+       val = TX_RETRY_EN | TX_PAD_EN | TX_APPEND_FCS;
+       nb8800_writeb(priv, NB8800_TX_CTL1, val);
+
+       /* Collision retry count */
+       nb8800_writeb(priv, NB8800_TX_CTL2, 5);
+
+       val = RX_PAD_STRIP | RX_AF_EN;
+       nb8800_writeb(priv, NB8800_RX_CTL, val);
+
+       /* Chosen by fair dice roll */
+       nb8800_writeb(priv, NB8800_RANDOM_SEED, 4);
+
+       /* TX cycles per deferral period */
+       nb8800_writeb(priv, NB8800_TX_SDP, 12);
+
+       /* The following three threshold values have been
+        * experimentally determined for good results.
+        */
+
+       /* RX/TX FIFO threshold for partial empty (64-bit entries) */
+       nb8800_writeb(priv, NB8800_PE_THRESHOLD, 0);
+
+       /* RX/TX FIFO threshold for partial full (64-bit entries) */
+       nb8800_writeb(priv, NB8800_PF_THRESHOLD, 255);
+
+       /* Buffer size for transmit (64-bit entries) */
+       nb8800_writeb(priv, NB8800_TX_BUFSIZE, 64);
+
+       /* Configure tx DMA */
+
+       val = nb8800_readl(priv, NB8800_TXC_CR);
+       val &= TCR_LE;          /* keep endian setting */
+       val |= TCR_DM;          /* DMA descriptor mode */
+       val |= TCR_RS;          /* automatically store tx status  */
+       val |= TCR_DIE;         /* interrupt on DMA chain completion */
+       val |= TCR_TFI(7);      /* interrupt after 7 frames transmitted */
+       val |= TCR_BTS(2);      /* 32-byte bus transaction size */
+       nb8800_writel(priv, NB8800_TXC_CR, val);
+
+       /* TX complete interrupt after 10 ms or 7 frames (see above) */
+       val = clk_get_rate(priv->clk) / 100;
+       nb8800_writel(priv, NB8800_TX_ITR, val);
+
+       /* Configure rx DMA */
+
+       val = nb8800_readl(priv, NB8800_RXC_CR);
+       val &= RCR_LE;          /* keep endian setting */
+       val |= RCR_DM;          /* DMA descriptor mode */
+       val |= RCR_RS;          /* automatically store rx status */
+       val |= RCR_DIE;         /* interrupt at end of DMA chain */
+       val |= RCR_RFI(7);      /* interrupt after 7 frames received */
+       val |= RCR_BTS(2);      /* 32-byte bus transaction size */
+       nb8800_writel(priv, NB8800_RXC_CR, val);
+
+       /* The rx interrupt can fire before the DMA has completed
+        * unless a small delay is added.  50 us is hopefully enough.
+        */
+       priv->rx_itr_irq = clk_get_rate(priv->clk) / 20000;
+
+       /* In NAPI poll mode we want to disable interrupts, but the
+        * hardware does not permit this.  Delay 10 ms instead.
+        */
+       priv->rx_itr_poll = clk_get_rate(priv->clk) / 100;
+
+       nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq);
+
+       priv->rx_dma_config = RX_BUF_SIZE | DESC_BTS(2) | DESC_DS | DESC_EOF;
+
+       /* Flow control settings */
+
+       /* Pause time of 0.1 ms */
+       val = 100000 / 512;
+       nb8800_writeb(priv, NB8800_PQ1, val >> 8);
+       nb8800_writeb(priv, NB8800_PQ2, val & 0xff);
+
+       /* Auto-negotiate by default */
+       priv->pause_aneg = true;
+       priv->pause_rx = true;
+       priv->pause_tx = true;
+
+       nb8800_mc_init(dev, 0);
+
+       return 0;
+}
+
+static int nb8800_tangox_init(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       u32 pad_mode = PAD_MODE_MII;
+
+       switch (priv->phy_mode) {
+       case PHY_INTERFACE_MODE_MII:
+       case PHY_INTERFACE_MODE_GMII:
+               pad_mode = PAD_MODE_MII;
+               break;
+
+       case PHY_INTERFACE_MODE_RGMII:
+               pad_mode = PAD_MODE_RGMII;
+               break;
+
+       case PHY_INTERFACE_MODE_RGMII_TXID:
+               pad_mode = PAD_MODE_RGMII | PAD_MODE_GTX_CLK_DELAY;
+               break;
+
+       default:
+               dev_err(dev->dev.parent, "unsupported phy mode %s\n",
+                       phy_modes(priv->phy_mode));
+               return -EINVAL;
+       }
+
+       nb8800_writeb(priv, NB8800_TANGOX_PAD_MODE, pad_mode);
+
+       return 0;
+}
+
+static int nb8800_tangox_reset(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       int clk_div;
+
+       nb8800_writeb(priv, NB8800_TANGOX_RESET, 0);
+       usleep_range(1000, 10000);
+       nb8800_writeb(priv, NB8800_TANGOX_RESET, 1);
+
+       wmb();          /* ensure reset is cleared before proceeding */
+
+       clk_div = DIV_ROUND_UP(clk_get_rate(priv->clk), 2 * MAX_MDC_CLOCK);
+       nb8800_writew(priv, NB8800_TANGOX_MDIO_CLKDIV, clk_div);
+
+       return 0;
+}
+
+static const struct nb8800_ops nb8800_tangox_ops = {
+       .init   = nb8800_tangox_init,
+       .reset  = nb8800_tangox_reset,
+};
+
+static int nb8800_tango4_init(struct net_device *dev)
+{
+       struct nb8800_priv *priv = netdev_priv(dev);
+       int err;
+
+       err = nb8800_tangox_init(dev);
+       if (err)
+               return err;
+
+       /* On tango4 interrupt on DMA completion per frame works and gives
+        * better performance despite generating more rx interrupts.
+        */
+
+       /* Disable unnecessary interrupt on rx completion */
+       nb8800_clearl(priv, NB8800_RXC_CR, RCR_RFI(7));
+
+       /* Request interrupt on descriptor DMA completion */
+       priv->rx_dma_config |= DESC_ID;
+
+       return 0;
+}
+
+static const struct nb8800_ops nb8800_tango4_ops = {
+       .init   = nb8800_tango4_init,
+       .reset  = nb8800_tangox_reset,
+};
+
+static const struct of_device_id nb8800_dt_ids[] = {
+       {
+               .compatible = "aurora,nb8800",
+       },
+       {
+               .compatible = "sigma,smp8642-ethernet",
+               .data = &nb8800_tangox_ops,
+       },
+       {
+               .compatible = "sigma,smp8734-ethernet",
+               .data = &nb8800_tango4_ops,
+       },
+       { }
+};
+
+static int nb8800_probe(struct platform_device *pdev)
+{
+       const struct of_device_id *match;
+       const struct nb8800_ops *ops = NULL;
+       struct nb8800_priv *priv;
+       struct resource *res;
+       struct net_device *dev;
+       struct mii_bus *bus;
+       const unsigned char *mac;
+       void __iomem *base;
+       int irq;
+       int ret;
+
+       match = of_match_device(nb8800_dt_ids, &pdev->dev);
+       if (match)
+               ops = match->data;
+
+       irq = platform_get_irq(pdev, 0);
+       if (irq <= 0) {
+               dev_err(&pdev->dev, "No IRQ\n");
+               return -EINVAL;
+       }
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(base))
+               return PTR_ERR(base);
+
+       dev_dbg(&pdev->dev, "AU-NB8800 Ethernet at %pa\n", &res->start);
+
+       dev = alloc_etherdev(sizeof(*priv));
+       if (!dev)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, dev);
+       SET_NETDEV_DEV(dev, &pdev->dev);
+
+       priv = netdev_priv(dev);
+       priv->base = base;
+
+       priv->phy_mode = of_get_phy_mode(pdev->dev.of_node);
+       if (priv->phy_mode < 0)
+               priv->phy_mode = PHY_INTERFACE_MODE_RGMII;
+
+       priv->clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(priv->clk)) {
+               dev_err(&pdev->dev, "failed to get clock\n");
+               ret = PTR_ERR(priv->clk);
+               goto err_free_dev;
+       }
+
+       ret = clk_prepare_enable(priv->clk);
+       if (ret)
+               goto err_free_dev;
+
+       spin_lock_init(&priv->tx_lock);
+
+       if (ops && ops->reset) {
+               ret = ops->reset(dev);
+               if (ret)
+                       goto err_free_dev;
+       }
+
+       bus = devm_mdiobus_alloc(&pdev->dev);
+       if (!bus) {
+               ret = -ENOMEM;
+               goto err_disable_clk;
+       }
+
+       bus->name = "nb8800-mii";
+       bus->read = nb8800_mdio_read;
+       bus->write = nb8800_mdio_write;
+       bus->parent = &pdev->dev;
+       snprintf(bus->id, MII_BUS_ID_SIZE, "%lx.nb8800-mii",
+                (unsigned long)res->start);
+       bus->priv = priv;
+
+       ret = of_mdiobus_register(bus, pdev->dev.of_node);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to register MII bus\n");
+               goto err_disable_clk;
+       }
+
+       priv->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
+       if (!priv->phy_node) {
+               dev_err(&pdev->dev, "no PHY specified\n");
+               ret = -ENODEV;
+               goto err_free_bus;
+       }
+
+       priv->mii_bus = bus;
+
+       ret = nb8800_hw_init(dev);
+       if (ret)
+               goto err_free_bus;
+
+       if (ops && ops->init) {
+               ret = ops->init(dev);
+               if (ret)
+                       goto err_free_bus;
+       }
+
+       dev->netdev_ops = &nb8800_netdev_ops;
+       dev->ethtool_ops = &nb8800_ethtool_ops;
+       dev->flags |= IFF_MULTICAST;
+       dev->irq = irq;
+
+       mac = of_get_mac_address(pdev->dev.of_node);
+       if (mac)
+               ether_addr_copy(dev->dev_addr, mac);
+
+       if (!is_valid_ether_addr(dev->dev_addr))
+               eth_hw_addr_random(dev);
+
+       nb8800_update_mac_addr(dev);
+
+       netif_carrier_off(dev);
+
+       ret = register_netdev(dev);
+       if (ret) {
+               netdev_err(dev, "failed to register netdev\n");
+               goto err_free_dma;
+       }
+
+       netif_napi_add(dev, &priv->napi, nb8800_poll, NAPI_POLL_WEIGHT);
+
+       netdev_info(dev, "MAC address %pM\n", dev->dev_addr);
+
+       return 0;
+
+err_free_dma:
+       nb8800_dma_free(dev);
+err_free_bus:
+       mdiobus_unregister(bus);
+err_disable_clk:
+       clk_disable_unprepare(priv->clk);
+err_free_dev:
+       free_netdev(dev);
+
+       return ret;
+}
+
+static int nb8800_remove(struct platform_device *pdev)
+{
+       struct net_device *ndev = platform_get_drvdata(pdev);
+       struct nb8800_priv *priv = netdev_priv(ndev);
+
+       unregister_netdev(ndev);
+
+       mdiobus_unregister(priv->mii_bus);
+
+       clk_disable_unprepare(priv->clk);
+
+       nb8800_dma_free(ndev);
+       free_netdev(ndev);
+
+       return 0;
+}
+
+static struct platform_driver nb8800_driver = {
+       .driver = {
+               .name           = "nb8800",
+               .of_match_table = nb8800_dt_ids,
+       },
+       .probe  = nb8800_probe,
+       .remove = nb8800_remove,
+};
+
+module_platform_driver(nb8800_driver);
+
+MODULE_DESCRIPTION("Aurora AU-NB8800 Ethernet driver");
+MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/aurora/nb8800.h b/drivers/net/ethernet/aurora/nb8800.h
new file mode 100644 (file)
index 0000000..e5adbc2
--- /dev/null
@@ -0,0 +1,316 @@
+#ifndef _NB8800_H_
+#define _NB8800_H_
+
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/phy.h>
+#include <linux/clk.h>
+#include <linux/bitops.h>
+
+#define RX_DESC_COUNT                  256
+#define TX_DESC_COUNT                  256
+
+#define NB8800_DESC_LOW                        4
+
+#define RX_BUF_SIZE                    1552
+
+#define RX_COPYBREAK                   256
+#define RX_COPYHDR                     128
+
+#define MAX_MDC_CLOCK                  2500000
+
+/* Stargate Solutions SSN8800 core registers */
+#define NB8800_TX_CTL1                 0x000
+#define TX_TPD                         BIT(5)
+#define TX_APPEND_FCS                  BIT(4)
+#define TX_PAD_EN                      BIT(3)
+#define TX_RETRY_EN                    BIT(2)
+#define TX_EN                          BIT(0)
+
+#define NB8800_TX_CTL2                 0x001
+
+#define NB8800_RX_CTL                  0x004
+#define RX_BC_DISABLE                  BIT(7)
+#define RX_RUNT                                BIT(6)
+#define RX_AF_EN                       BIT(5)
+#define RX_PAUSE_EN                    BIT(3)
+#define RX_SEND_CRC                    BIT(2)
+#define RX_PAD_STRIP                   BIT(1)
+#define RX_EN                          BIT(0)
+
+#define NB8800_RANDOM_SEED             0x008
+#define NB8800_TX_SDP                  0x14
+#define NB8800_TX_TPDP1                        0x18
+#define NB8800_TX_TPDP2                        0x19
+#define NB8800_SLOT_TIME               0x1c
+
+#define NB8800_MDIO_CMD                        0x020
+#define MDIO_CMD_GO                    BIT(31)
+#define MDIO_CMD_WR                    BIT(26)
+#define MDIO_CMD_ADDR(x)               ((x) << 21)
+#define MDIO_CMD_REG(x)                        ((x) << 16)
+#define MDIO_CMD_DATA(x)               ((x) <<  0)
+
+#define NB8800_MDIO_STS                        0x024
+#define MDIO_STS_ERR                   BIT(31)
+
+#define NB8800_MC_ADDR(i)              (0x028 + (i))
+#define NB8800_MC_INIT                 0x02e
+#define NB8800_UC_ADDR(i)              (0x03c + (i))
+
+#define NB8800_MAC_MODE                        0x044
+#define RGMII_MODE                     BIT(7)
+#define HALF_DUPLEX                    BIT(4)
+#define BURST_EN                       BIT(3)
+#define LOOPBACK_EN                    BIT(2)
+#define GMAC_MODE                      BIT(0)
+
+#define NB8800_IC_THRESHOLD            0x050
+#define NB8800_PE_THRESHOLD            0x051
+#define NB8800_PF_THRESHOLD            0x052
+#define NB8800_TX_BUFSIZE              0x054
+#define NB8800_FIFO_CTL                        0x056
+#define NB8800_PQ1                     0x060
+#define NB8800_PQ2                     0x061
+#define NB8800_SRC_ADDR(i)             (0x06a + (i))
+#define NB8800_STAT_DATA               0x078
+#define NB8800_STAT_INDEX              0x07c
+#define NB8800_STAT_CLEAR              0x07d
+
+#define NB8800_SLEEP_MODE              0x07e
+#define SLEEP_MODE                     BIT(0)
+
+#define NB8800_WAKEUP                  0x07f
+#define WAKEUP                         BIT(0)
+
+/* Aurora NB8800 host interface registers */
+#define NB8800_TXC_CR                  0x100
+#define TCR_LK                         BIT(12)
+#define TCR_DS                         BIT(11)
+#define TCR_BTS(x)                     (((x) & 0x7) << 8)
+#define TCR_DIE                                BIT(7)
+#define TCR_TFI(x)                     (((x) & 0x7) << 4)
+#define TCR_LE                         BIT(3)
+#define TCR_RS                         BIT(2)
+#define TCR_DM                         BIT(1)
+#define TCR_EN                         BIT(0)
+
+#define NB8800_TXC_SR                  0x104
+#define TSR_DE                         BIT(3)
+#define TSR_DI                         BIT(2)
+#define TSR_TO                         BIT(1)
+#define TSR_TI                         BIT(0)
+
+#define NB8800_TX_SAR                  0x108
+#define NB8800_TX_DESC_ADDR            0x10c
+
+#define NB8800_TX_REPORT_ADDR          0x110
+#define TX_BYTES_TRANSFERRED(x)                (((x) >> 16) & 0xffff)
+#define TX_FIRST_DEFERRAL              BIT(7)
+#define TX_EARLY_COLLISIONS(x)         (((x) >> 3) & 0xf)
+#define TX_LATE_COLLISION              BIT(2)
+#define TX_PACKET_DROPPED              BIT(1)
+#define TX_FIFO_UNDERRUN               BIT(0)
+#define IS_TX_ERROR(r)                 ((r) & 0x07)
+
+#define NB8800_TX_FIFO_SR              0x114
+#define NB8800_TX_ITR                  0x118
+
+#define NB8800_RXC_CR                  0x200
+#define RCR_FL                         BIT(13)
+#define RCR_LK                         BIT(12)
+#define RCR_DS                         BIT(11)
+#define RCR_BTS(x)                     (((x) & 7) << 8)
+#define RCR_DIE                                BIT(7)
+#define RCR_RFI(x)                     (((x) & 7) << 4)
+#define RCR_LE                         BIT(3)
+#define RCR_RS                         BIT(2)
+#define RCR_DM                         BIT(1)
+#define RCR_EN                         BIT(0)
+
+#define NB8800_RXC_SR                  0x204
+#define RSR_DE                         BIT(3)
+#define RSR_DI                         BIT(2)
+#define RSR_RO                         BIT(1)
+#define RSR_RI                         BIT(0)
+
+#define NB8800_RX_SAR                  0x208
+#define NB8800_RX_DESC_ADDR            0x20c
+
+#define NB8800_RX_REPORT_ADDR          0x210
+#define RX_BYTES_TRANSFERRED(x)                (((x) >> 16) & 0xFFFF)
+#define RX_MULTICAST_PKT               BIT(9)
+#define RX_BROADCAST_PKT               BIT(8)
+#define RX_LENGTH_ERR                  BIT(7)
+#define RX_FCS_ERR                     BIT(6)
+#define RX_RUNT_PKT                    BIT(5)
+#define RX_FIFO_OVERRUN                        BIT(4)
+#define RX_LATE_COLLISION              BIT(3)
+#define RX_ALIGNMENT_ERROR             BIT(2)
+#define RX_ERROR_MASK                  0xfc
+#define IS_RX_ERROR(r)                 ((r) & RX_ERROR_MASK)
+
+#define NB8800_RX_FIFO_SR              0x214
+#define NB8800_RX_ITR                  0x218
+
+/* Sigma Designs SMP86xx additional registers */
+#define NB8800_TANGOX_PAD_MODE         0x400
+#define PAD_MODE_MASK                  0x7
+#define PAD_MODE_MII                   0x0
+#define PAD_MODE_RGMII                 0x1
+#define PAD_MODE_GTX_CLK_INV           BIT(3)
+#define PAD_MODE_GTX_CLK_DELAY         BIT(4)
+
+#define NB8800_TANGOX_MDIO_CLKDIV      0x420
+#define NB8800_TANGOX_RESET            0x424
+
+/* Hardware DMA descriptor */
+struct nb8800_dma_desc {
+       u32                             s_addr; /* start address */
+       u32                             n_addr; /* next descriptor address */
+       u32                             r_addr; /* report address */
+       u32                             config;
+} __aligned(8);
+
+#define DESC_ID                                BIT(23)
+#define DESC_EOC                       BIT(22)
+#define DESC_EOF                       BIT(21)
+#define DESC_LK                                BIT(20)
+#define DESC_DS                                BIT(19)
+#define DESC_BTS(x)                    (((x) & 0x7) << 16)
+
+/* DMA descriptor and associated data for rx.
+ * Allocated from coherent memory.
+ */
+struct nb8800_rx_desc {
+       /* DMA descriptor */
+       struct nb8800_dma_desc          desc;
+
+       /* Status report filled in by hardware */
+       u32                             report;
+};
+
+/* Address of buffer on rx ring */
+struct nb8800_rx_buf {
+       struct page                     *page;
+       unsigned long                   offset;
+};
+
+/* DMA descriptors and associated data for tx.
+ * Allocated from coherent memory.
+ */
+struct nb8800_tx_desc {
+       /* DMA descriptor.  The second descriptor is used if packet
+        * data is unaligned.
+        */
+       struct nb8800_dma_desc          desc[2];
+
+       /* Status report filled in by hardware */
+       u32                             report;
+
+       /* Bounce buffer for initial unaligned part of packet */
+       u8                              buf[8] __aligned(8);
+};
+
+/* Packet in tx queue */
+struct nb8800_tx_buf {
+       /* Currently queued skb */
+       struct sk_buff                  *skb;
+
+       /* DMA address of the first descriptor */
+       dma_addr_t                      dma_desc;
+
+       /* DMA address of packet data */
+       dma_addr_t                      dma_addr;
+
+       /* Length of DMA mapping, less than skb->len if alignment
+        * buffer is used.
+        */
+       unsigned int                    dma_len;
+
+       /* Number of packets in chain starting here */
+       unsigned int                    chain_len;
+
+       /* Packet chain ready to be submitted to hardware */
+       bool                            ready;
+};
+
+struct nb8800_priv {
+       struct napi_struct              napi;
+
+       void __iomem                    *base;
+
+       /* RX DMA descriptors */
+       struct nb8800_rx_desc           *rx_descs;
+
+       /* RX buffers referenced by DMA descriptors */
+       struct nb8800_rx_buf            *rx_bufs;
+
+       /* Current end of chain */
+       u32                             rx_eoc;
+
+       /* Value for rx interrupt time register in NAPI interrupt mode */
+       u32                             rx_itr_irq;
+
+       /* Value for rx interrupt time register in NAPI poll mode */
+       u32                             rx_itr_poll;
+
+       /* Value for config field of rx DMA descriptors */
+       u32                             rx_dma_config;
+
+       /* TX DMA descriptors */
+       struct nb8800_tx_desc           *tx_descs;
+
+       /* TX packet queue */
+       struct nb8800_tx_buf            *tx_bufs;
+
+       /* Number of free tx queue entries */
+       atomic_t                        tx_free;
+
+       /* First free tx queue entry */
+       u32                             tx_next;
+
+       /* Next buffer to transmit */
+       u32                             tx_queue;
+
+       /* Start of current packet chain */
+       struct nb8800_tx_buf            *tx_chain;
+
+       /* Next buffer to reclaim */
+       u32                             tx_done;
+
+       /* Lock for DMA activation */
+       spinlock_t                      tx_lock;
+
+       struct mii_bus                  *mii_bus;
+       struct device_node              *phy_node;
+       struct phy_device               *phydev;
+
+       /* PHY connection type from DT */
+       int                             phy_mode;
+
+       /* Current link status */
+       int                             speed;
+       int                             duplex;
+       int                             link;
+
+       /* Pause settings */
+       bool                            pause_aneg;
+       bool                            pause_rx;
+       bool                            pause_tx;
+
+       /* DMA base address of rx descriptors, see rx_descs above */
+       dma_addr_t                      rx_desc_dma;
+
+       /* DMA base address of tx descriptors, see tx_descs above */
+       dma_addr_t                      tx_desc_dma;
+
+       struct clk                      *clk;
+};
+
+struct nb8800_ops {
+       int                             (*init)(struct net_device *dev);
+       int                             (*reset)(struct net_device *dev);
+};
+
+#endif /* _NB8800_H_ */