Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1280 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sun/sunbmac.c b/drivers/net/ethernet/sun/sunbmac.c
new file mode 100644
index 000000000..34b94153b
--- /dev/null
+++ b/drivers/net/ethernet/sun/sunbmac.c
@@ -0,0 +1,1280 @@
+// SPDX-License-Identifier: GPL-2.0
+/* sunbmac.c: Driver for Sparc BigMAC 100baseT ethernet adapters.
+ *
+ * Copyright (C) 1997, 1998, 1999, 2003, 2008 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/module.h>
+#include <linux/pgtable.h>
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/crc32.h>
+#include <linux/errno.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/gfp.h>
+
+#include <asm/auxio.h>
+#include <asm/byteorder.h>
+#include <asm/dma.h>
+#include <asm/idprom.h>
+#include <asm/io.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+
+#include "sunbmac.h"
+
+#define DRV_NAME	"sunbmac"
+#define DRV_VERSION	"2.1"
+#define DRV_RELDATE	"August 26, 2008"
+#define DRV_AUTHOR	"David S. Miller (davem@davemloft.net)"
+
+static char version[] =
+	DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n";
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR(DRV_AUTHOR);
+MODULE_DESCRIPTION("Sun BigMAC 100baseT ethernet driver");
+MODULE_LICENSE("GPL");
+
+#undef DEBUG_PROBE
+#undef DEBUG_TX
+#undef DEBUG_IRQ
+
+#ifdef DEBUG_PROBE
+#define DP(x)  printk x
+#else
+#define DP(x)
+#endif
+
+#ifdef DEBUG_TX
+#define DTX(x)  printk x
+#else
+#define DTX(x)
+#endif
+
+#ifdef DEBUG_IRQ
+#define DIRQ(x)  printk x
+#else
+#define DIRQ(x)
+#endif
+
+#define DEFAULT_JAMSIZE    4 /* Toe jam */
+
+#define QEC_RESET_TRIES 200
+
+static int qec_global_reset(void __iomem *gregs)
+{
+	int tries = QEC_RESET_TRIES;
+
+	sbus_writel(GLOB_CTRL_RESET, gregs + GLOB_CTRL);
+	while (--tries) {
+		if (sbus_readl(gregs + GLOB_CTRL) & GLOB_CTRL_RESET) {
+			udelay(20);
+			continue;
+		}
+		break;
+	}
+	if (tries)
+		return 0;
+	printk(KERN_ERR "BigMAC: Cannot reset the QEC.\n");
+	return -1;
+}
+
+static void qec_init(struct bigmac *bp)
+{
+	struct platform_device *qec_op = bp->qec_op;
+	void __iomem *gregs = bp->gregs;
+	u8 bsizes = bp->bigmac_bursts;
+	u32 regval;
+
+	/* 64byte bursts do not work at the moment, do
+	 * not even try to enable them.  -DaveM
+	 */
+	if (bsizes & DMA_BURST32)
+		regval = GLOB_CTRL_B32;
+	else
+		regval = GLOB_CTRL_B16;
+	sbus_writel(regval | GLOB_CTRL_BMODE, gregs + GLOB_CTRL);
+	sbus_writel(GLOB_PSIZE_2048, gregs + GLOB_PSIZE);
+
+	/* All of memsize is given to bigmac. */
+	sbus_writel(resource_size(&qec_op->resource[1]),
+		    gregs + GLOB_MSIZE);
+
+	/* Half to the transmitter, half to the receiver. */
+	sbus_writel(resource_size(&qec_op->resource[1]) >> 1,
+		    gregs + GLOB_TSIZE);
+	sbus_writel(resource_size(&qec_op->resource[1]) >> 1,
+		    gregs + GLOB_RSIZE);
+}
+
+#define TX_RESET_TRIES     32
+#define RX_RESET_TRIES     32
+
+static void bigmac_tx_reset(void __iomem *bregs)
+{
+	int tries = TX_RESET_TRIES;
+
+	sbus_writel(0, bregs + BMAC_TXCFG);
+
+	/* The fifo threshold bit is read-only and does
+	 * not clear.  -DaveM
+	 */
+	while ((sbus_readl(bregs + BMAC_TXCFG) & ~(BIGMAC_TXCFG_FIFO)) != 0 &&
+	       --tries != 0)
+		udelay(20);
+
+	if (!tries) {
+		printk(KERN_ERR "BIGMAC: Transmitter will not reset.\n");
+		printk(KERN_ERR "BIGMAC: tx_cfg is %08x\n",
+		       sbus_readl(bregs + BMAC_TXCFG));
+	}
+}
+
+static void bigmac_rx_reset(void __iomem *bregs)
+{
+	int tries = RX_RESET_TRIES;
+
+	sbus_writel(0, bregs + BMAC_RXCFG);
+	while (sbus_readl(bregs + BMAC_RXCFG) && --tries)
+		udelay(20);
+
+	if (!tries) {
+		printk(KERN_ERR "BIGMAC: Receiver will not reset.\n");
+		printk(KERN_ERR "BIGMAC: rx_cfg is %08x\n",
+		       sbus_readl(bregs + BMAC_RXCFG));
+	}
+}
+
+/* Reset the transmitter and receiver. */
+static void bigmac_stop(struct bigmac *bp)
+{
+	bigmac_tx_reset(bp->bregs);
+	bigmac_rx_reset(bp->bregs);
+}
+
+static void bigmac_get_counters(struct bigmac *bp, void __iomem *bregs)
+{
+	struct net_device_stats *stats = &bp->dev->stats;
+
+	stats->rx_crc_errors += sbus_readl(bregs + BMAC_RCRCECTR);
+	sbus_writel(0, bregs + BMAC_RCRCECTR);
+
+	stats->rx_frame_errors += sbus_readl(bregs + BMAC_UNALECTR);
+	sbus_writel(0, bregs + BMAC_UNALECTR);
+
+	stats->rx_length_errors += sbus_readl(bregs + BMAC_GLECTR);
+	sbus_writel(0, bregs + BMAC_GLECTR);
+
+	stats->tx_aborted_errors += sbus_readl(bregs + BMAC_EXCTR);
+
+	stats->collisions +=
+		(sbus_readl(bregs + BMAC_EXCTR) +
+		 sbus_readl(bregs + BMAC_LTCTR));
+	sbus_writel(0, bregs + BMAC_EXCTR);
+	sbus_writel(0, bregs + BMAC_LTCTR);
+}
+
+static void bigmac_clean_rings(struct bigmac *bp)
+{
+	int i;
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		if (bp->rx_skbs[i] != NULL) {
+			dev_kfree_skb_any(bp->rx_skbs[i]);
+			bp->rx_skbs[i] = NULL;
+		}
+	}
+
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		if (bp->tx_skbs[i] != NULL) {
+			dev_kfree_skb_any(bp->tx_skbs[i]);
+			bp->tx_skbs[i] = NULL;
+		}
+	}
+}
+
+static void bigmac_init_rings(struct bigmac *bp, bool non_blocking)
+{
+	struct bmac_init_block *bb = bp->bmac_block;
+	int i;
+	gfp_t gfp_flags = GFP_KERNEL;
+
+	if (non_blocking)
+		gfp_flags = GFP_ATOMIC;
+
+	bp->rx_new = bp->rx_old = bp->tx_new = bp->tx_old = 0;
+
+	/* Free any skippy bufs left around in the rings. */
+	bigmac_clean_rings(bp);
+
+	/* Now get new skbufs for the receive ring. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		struct sk_buff *skb;
+
+		skb = big_mac_alloc_skb(RX_BUF_ALLOC_SIZE, gfp_flags);
+		if (!skb)
+			continue;
+
+		bp->rx_skbs[i] = skb;
+
+		/* Because we reserve afterwards. */
+		skb_put(skb, ETH_FRAME_LEN);
+		skb_reserve(skb, 34);
+
+		bb->be_rxd[i].rx_addr =
+			dma_map_single(&bp->bigmac_op->dev,
+				       skb->data,
+				       RX_BUF_ALLOC_SIZE - 34,
+				       DMA_FROM_DEVICE);
+		bb->be_rxd[i].rx_flags =
+			(RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH));
+	}
+
+	for (i = 0; i < TX_RING_SIZE; i++)
+		bb->be_txd[i].tx_flags = bb->be_txd[i].tx_addr = 0;
+}
+
+#define MGMT_CLKON  (MGMT_PAL_INT_MDIO|MGMT_PAL_EXT_MDIO|MGMT_PAL_OENAB|MGMT_PAL_DCLOCK)
+#define MGMT_CLKOFF (MGMT_PAL_INT_MDIO|MGMT_PAL_EXT_MDIO|MGMT_PAL_OENAB)
+
+static void idle_transceiver(void __iomem *tregs)
+{
+	int i = 20;
+
+	while (i--) {
+		sbus_writel(MGMT_CLKOFF, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		sbus_writel(MGMT_CLKON, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+	}
+}
+
+static void write_tcvr_bit(struct bigmac *bp, void __iomem *tregs, int bit)
+{
+	if (bp->tcvr_type == internal) {
+		bit = (bit & 1) << 3;
+		sbus_writel(bit | (MGMT_PAL_OENAB | MGMT_PAL_EXT_MDIO),
+			    tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		sbus_writel(bit | MGMT_PAL_OENAB | MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK,
+			    tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+	} else if (bp->tcvr_type == external) {
+		bit = (bit & 1) << 2;
+		sbus_writel(bit | MGMT_PAL_INT_MDIO | MGMT_PAL_OENAB,
+			    tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		sbus_writel(bit | MGMT_PAL_INT_MDIO | MGMT_PAL_OENAB | MGMT_PAL_DCLOCK,
+			    tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+	} else {
+		printk(KERN_ERR "write_tcvr_bit: No transceiver type known!\n");
+	}
+}
+
+static int read_tcvr_bit(struct bigmac *bp, void __iomem *tregs)
+{
+	int retval = 0;
+
+	if (bp->tcvr_type == internal) {
+		sbus_writel(MGMT_PAL_EXT_MDIO, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		sbus_writel(MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK,
+			    tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_INT_MDIO) >> 3;
+	} else if (bp->tcvr_type == external) {
+		sbus_writel(MGMT_PAL_INT_MDIO, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_DCLOCK, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_EXT_MDIO) >> 2;
+	} else {
+		printk(KERN_ERR "read_tcvr_bit: No transceiver type known!\n");
+	}
+	return retval;
+}
+
+static int read_tcvr_bit2(struct bigmac *bp, void __iomem *tregs)
+{
+	int retval = 0;
+
+	if (bp->tcvr_type == internal) {
+		sbus_writel(MGMT_PAL_EXT_MDIO, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_INT_MDIO) >> 3;
+		sbus_writel(MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+	} else if (bp->tcvr_type == external) {
+		sbus_writel(MGMT_PAL_INT_MDIO, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+		retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_EXT_MDIO) >> 2;
+		sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_DCLOCK, tregs + TCVR_MPAL);
+		sbus_readl(tregs + TCVR_MPAL);
+	} else {
+		printk(KERN_ERR "read_tcvr_bit2: No transceiver type known!\n");
+	}
+	return retval;
+}
+
+static void put_tcvr_byte(struct bigmac *bp,
+			  void __iomem *tregs,
+			  unsigned int byte)
+{
+	int shift = 4;
+
+	do {
+		write_tcvr_bit(bp, tregs, ((byte >> shift) & 1));
+		shift -= 1;
+	} while (shift >= 0);
+}
+
+static void bigmac_tcvr_write(struct bigmac *bp, void __iomem *tregs,
+			      int reg, unsigned short val)
+{
+	int shift;
+
+	reg &= 0xff;
+	val &= 0xffff;
+	switch(bp->tcvr_type) {
+	case internal:
+	case external:
+		break;
+
+	default:
+		printk(KERN_ERR "bigmac_tcvr_read: Whoops, no known transceiver type.\n");
+		return;
+	}
+
+	idle_transceiver(tregs);
+	write_tcvr_bit(bp, tregs, 0);
+	write_tcvr_bit(bp, tregs, 1);
+	write_tcvr_bit(bp, tregs, 0);
+	write_tcvr_bit(bp, tregs, 1);
+
+	put_tcvr_byte(bp, tregs,
+		      ((bp->tcvr_type == internal) ?
+		       BIGMAC_PHY_INTERNAL : BIGMAC_PHY_EXTERNAL));
+
+	put_tcvr_byte(bp, tregs, reg);
+
+	write_tcvr_bit(bp, tregs, 1);
+	write_tcvr_bit(bp, tregs, 0);
+
+	shift = 15;
+	do {
+		write_tcvr_bit(bp, tregs, (val >> shift) & 1);
+		shift -= 1;
+	} while (shift >= 0);
+}
+
+static unsigned short bigmac_tcvr_read(struct bigmac *bp,
+				       void __iomem *tregs,
+				       int reg)
+{
+	unsigned short retval = 0;
+
+	reg &= 0xff;
+	switch(bp->tcvr_type) {
+	case internal:
+	case external:
+		break;
+
+	default:
+		printk(KERN_ERR "bigmac_tcvr_read: Whoops, no known transceiver type.\n");
+		return 0xffff;
+	}
+
+	idle_transceiver(tregs);
+	write_tcvr_bit(bp, tregs, 0);
+	write_tcvr_bit(bp, tregs, 1);
+	write_tcvr_bit(bp, tregs, 1);
+	write_tcvr_bit(bp, tregs, 0);
+
+	put_tcvr_byte(bp, tregs,
+		      ((bp->tcvr_type == internal) ?
+		       BIGMAC_PHY_INTERNAL : BIGMAC_PHY_EXTERNAL));
+
+	put_tcvr_byte(bp, tregs, reg);
+
+	if (bp->tcvr_type == external) {
+		int shift = 15;
+
+		(void) read_tcvr_bit2(bp, tregs);
+		(void) read_tcvr_bit2(bp, tregs);
+
+		do {
+			int tmp;
+
+			tmp = read_tcvr_bit2(bp, tregs);
+			retval |= ((tmp & 1) << shift);
+			shift -= 1;
+		} while (shift >= 0);
+
+		(void) read_tcvr_bit2(bp, tregs);
+		(void) read_tcvr_bit2(bp, tregs);
+		(void) read_tcvr_bit2(bp, tregs);
+	} else {
+		int shift = 15;
+
+		(void) read_tcvr_bit(bp, tregs);
+		(void) read_tcvr_bit(bp, tregs);
+
+		do {
+			int tmp;
+
+			tmp = read_tcvr_bit(bp, tregs);
+			retval |= ((tmp & 1) << shift);
+			shift -= 1;
+		} while (shift >= 0);
+
+		(void) read_tcvr_bit(bp, tregs);
+		(void) read_tcvr_bit(bp, tregs);
+		(void) read_tcvr_bit(bp, tregs);
+	}
+	return retval;
+}
+
+static void bigmac_tcvr_init(struct bigmac *bp)
+{
+	void __iomem *tregs = bp->tregs;
+	u32 mpal;
+
+	idle_transceiver(tregs);
+	sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK,
+		    tregs + TCVR_MPAL);
+	sbus_readl(tregs + TCVR_MPAL);
+
+	/* Only the bit for the present transceiver (internal or
+	 * external) will stick, set them both and see what stays.
+	 */
+	sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_EXT_MDIO, tregs + TCVR_MPAL);
+	sbus_readl(tregs + TCVR_MPAL);
+	udelay(20);
+
+	mpal = sbus_readl(tregs + TCVR_MPAL);
+	if (mpal & MGMT_PAL_EXT_MDIO) {
+		bp->tcvr_type = external;
+		sbus_writel(~(TCVR_PAL_EXTLBACK | TCVR_PAL_MSENSE | TCVR_PAL_LTENABLE),
+			    tregs + TCVR_TPAL);
+		sbus_readl(tregs + TCVR_TPAL);
+	} else if (mpal & MGMT_PAL_INT_MDIO) {
+		bp->tcvr_type = internal;
+		sbus_writel(~(TCVR_PAL_SERIAL | TCVR_PAL_EXTLBACK |
+			      TCVR_PAL_MSENSE | TCVR_PAL_LTENABLE),
+			    tregs + TCVR_TPAL);
+		sbus_readl(tregs + TCVR_TPAL);
+	} else {
+		printk(KERN_ERR "BIGMAC: AIEEE, neither internal nor "
+		       "external MDIO available!\n");
+		printk(KERN_ERR "BIGMAC: mgmt_pal[%08x] tcvr_pal[%08x]\n",
+		       sbus_readl(tregs + TCVR_MPAL),
+		       sbus_readl(tregs + TCVR_TPAL));
+	}
+}
+
+static int bigmac_init_hw(struct bigmac *, bool);
+
+static int try_next_permutation(struct bigmac *bp, void __iomem *tregs)
+{
+	if (bp->sw_bmcr & BMCR_SPEED100) {
+		int timeout;
+
+		/* Reset the PHY. */
+		bp->sw_bmcr	= (BMCR_ISOLATE | BMCR_PDOWN | BMCR_LOOPBACK);
+		bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr);
+		bp->sw_bmcr	= (BMCR_RESET);
+		bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr);
+
+		timeout = 64;
+		while (--timeout) {
+			bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR);
+			if ((bp->sw_bmcr & BMCR_RESET) == 0)
+				break;
+			udelay(20);
+		}
+		if (timeout == 0)
+			printk(KERN_ERR "%s: PHY reset failed.\n", bp->dev->name);
+
+		bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR);
+
+		/* Now we try 10baseT. */
+		bp->sw_bmcr &= ~(BMCR_SPEED100);
+		bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr);
+		return 0;
+	}
+
+	/* We've tried them all. */
+	return -1;
+}
+
+static void bigmac_timer(struct timer_list *t)
+{
+	struct bigmac *bp = from_timer(bp, t, bigmac_timer);
+	void __iomem *tregs = bp->tregs;
+	int restart_timer = 0;
+
+	bp->timer_ticks++;
+	if (bp->timer_state == ltrywait) {
+		bp->sw_bmsr = bigmac_tcvr_read(bp, tregs, MII_BMSR);
+		bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR);
+		if (bp->sw_bmsr & BMSR_LSTATUS) {
+			printk(KERN_INFO "%s: Link is now up at %s.\n",
+			       bp->dev->name,
+			       (bp->sw_bmcr & BMCR_SPEED100) ?
+			       "100baseT" : "10baseT");
+			bp->timer_state = asleep;
+			restart_timer = 0;
+		} else {
+			if (bp->timer_ticks >= 4) {
+				int ret;
+
+				ret = try_next_permutation(bp, tregs);
+				if (ret == -1) {
+					printk(KERN_ERR "%s: Link down, cable problem?\n",
+					       bp->dev->name);
+					ret = bigmac_init_hw(bp, true);
+					if (ret) {
+						printk(KERN_ERR "%s: Error, cannot re-init the "
+						       "BigMAC.\n", bp->dev->name);
+					}
+					return;
+				}
+				bp->timer_ticks = 0;
+				restart_timer = 1;
+			} else {
+				restart_timer = 1;
+			}
+		}
+	} else {
+		/* Can't happens.... */
+		printk(KERN_ERR "%s: Aieee, link timer is asleep but we got one anyways!\n",
+		       bp->dev->name);
+		restart_timer = 0;
+		bp->timer_ticks = 0;
+		bp->timer_state = asleep; /* foo on you */
+	}
+
+	if (restart_timer != 0) {
+		bp->bigmac_timer.expires = jiffies + ((12 * HZ)/10); /* 1.2 sec. */
+		add_timer(&bp->bigmac_timer);
+	}
+}
+
+/* Well, really we just force the chip into 100baseT then
+ * 10baseT, each time checking for a link status.
+ */
+static void bigmac_begin_auto_negotiation(struct bigmac *bp)
+{
+	void __iomem *tregs = bp->tregs;
+	int timeout;
+
+	/* Grab new software copies of PHY registers. */
+	bp->sw_bmsr	= bigmac_tcvr_read(bp, tregs, MII_BMSR);
+	bp->sw_bmcr	= bigmac_tcvr_read(bp, tregs, MII_BMCR);
+
+	/* Reset the PHY. */
+	bp->sw_bmcr	= (BMCR_ISOLATE | BMCR_PDOWN | BMCR_LOOPBACK);
+	bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr);
+	bp->sw_bmcr	= (BMCR_RESET);
+	bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr);
+
+	timeout = 64;
+	while (--timeout) {
+		bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR);
+		if ((bp->sw_bmcr & BMCR_RESET) == 0)
+			break;
+		udelay(20);
+	}
+	if (timeout == 0)
+		printk(KERN_ERR "%s: PHY reset failed.\n", bp->dev->name);
+
+	bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR);
+
+	/* First we try 100baseT. */
+	bp->sw_bmcr |= BMCR_SPEED100;
+	bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr);
+
+	bp->timer_state = ltrywait;
+	bp->timer_ticks = 0;
+	bp->bigmac_timer.expires = jiffies + (12 * HZ) / 10;
+	add_timer(&bp->bigmac_timer);
+}
+
+static int bigmac_init_hw(struct bigmac *bp, bool non_blocking)
+{
+	void __iomem *gregs        = bp->gregs;
+	void __iomem *cregs        = bp->creg;
+	void __iomem *bregs        = bp->bregs;
+	__u32 bblk_dvma = (__u32)bp->bblock_dvma;
+	const unsigned char *e = &bp->dev->dev_addr[0];
+
+	/* Latch current counters into statistics. */
+	bigmac_get_counters(bp, bregs);
+
+	/* Reset QEC. */
+	qec_global_reset(gregs);
+
+	/* Init QEC. */
+	qec_init(bp);
+
+	/* Alloc and reset the tx/rx descriptor chains. */
+	bigmac_init_rings(bp, non_blocking);
+
+	/* Initialize the PHY. */
+	bigmac_tcvr_init(bp);
+
+	/* Stop transmitter and receiver. */
+	bigmac_stop(bp);
+
+	/* Set hardware ethernet address. */
+	sbus_writel(((e[4] << 8) | e[5]), bregs + BMAC_MACADDR2);
+	sbus_writel(((e[2] << 8) | e[3]), bregs + BMAC_MACADDR1);
+	sbus_writel(((e[0] << 8) | e[1]), bregs + BMAC_MACADDR0);
+
+	/* Clear the hash table until mc upload occurs. */
+	sbus_writel(0, bregs + BMAC_HTABLE3);
+	sbus_writel(0, bregs + BMAC_HTABLE2);
+	sbus_writel(0, bregs + BMAC_HTABLE1);
+	sbus_writel(0, bregs + BMAC_HTABLE0);
+
+	/* Enable Big Mac hash table filter. */
+	sbus_writel(BIGMAC_RXCFG_HENABLE | BIGMAC_RXCFG_FIFO,
+		    bregs + BMAC_RXCFG);
+	udelay(20);
+
+	/* Ok, configure the Big Mac transmitter. */
+	sbus_writel(BIGMAC_TXCFG_FIFO, bregs + BMAC_TXCFG);
+
+	/* The HME docs recommend to use the 10LSB of our MAC here. */
+	sbus_writel(((e[5] | e[4] << 8) & 0x3ff),
+		    bregs + BMAC_RSEED);
+
+	/* Enable the output drivers no matter what. */
+	sbus_writel(BIGMAC_XCFG_ODENABLE | BIGMAC_XCFG_RESV,
+		    bregs + BMAC_XIFCFG);
+
+	/* Tell the QEC where the ring descriptors are. */
+	sbus_writel(bblk_dvma + bib_offset(be_rxd, 0),
+		    cregs + CREG_RXDS);
+	sbus_writel(bblk_dvma + bib_offset(be_txd, 0),
+		    cregs + CREG_TXDS);
+
+	/* Setup the FIFO pointers into QEC local memory. */
+	sbus_writel(0, cregs + CREG_RXRBUFPTR);
+	sbus_writel(0, cregs + CREG_RXWBUFPTR);
+	sbus_writel(sbus_readl(gregs + GLOB_RSIZE),
+		    cregs + CREG_TXRBUFPTR);
+	sbus_writel(sbus_readl(gregs + GLOB_RSIZE),
+		    cregs + CREG_TXWBUFPTR);
+
+	/* Tell bigmac what interrupts we don't want to hear about. */
+	sbus_writel(BIGMAC_IMASK_GOTFRAME | BIGMAC_IMASK_SENTFRAME,
+		    bregs + BMAC_IMASK);
+
+	/* Enable the various other irq's. */
+	sbus_writel(0, cregs + CREG_RIMASK);
+	sbus_writel(0, cregs + CREG_TIMASK);
+	sbus_writel(0, cregs + CREG_QMASK);
+	sbus_writel(0, cregs + CREG_BMASK);
+
+	/* Set jam size to a reasonable default. */
+	sbus_writel(DEFAULT_JAMSIZE, bregs + BMAC_JSIZE);
+
+	/* Clear collision counter. */
+	sbus_writel(0, cregs + CREG_CCNT);
+
+	/* Enable transmitter and receiver. */
+	sbus_writel(sbus_readl(bregs + BMAC_TXCFG) | BIGMAC_TXCFG_ENABLE,
+		    bregs + BMAC_TXCFG);
+	sbus_writel(sbus_readl(bregs + BMAC_RXCFG) | BIGMAC_RXCFG_ENABLE,
+		    bregs + BMAC_RXCFG);
+
+	/* Ok, start detecting link speed/duplex. */
+	bigmac_begin_auto_negotiation(bp);
+
+	/* Success. */
+	return 0;
+}
+
+/* Error interrupts get sent here. */
+static void bigmac_is_medium_rare(struct bigmac *bp, u32 qec_status, u32 bmac_status)
+{
+	printk(KERN_ERR "bigmac_is_medium_rare: ");
+	if (qec_status & (GLOB_STAT_ER | GLOB_STAT_BM)) {
+		if (qec_status & GLOB_STAT_ER)
+			printk("QEC_ERROR, ");
+		if (qec_status & GLOB_STAT_BM)
+			printk("QEC_BMAC_ERROR, ");
+	}
+	if (bmac_status & CREG_STAT_ERRORS) {
+		if (bmac_status & CREG_STAT_BERROR)
+			printk("BMAC_ERROR, ");
+		if (bmac_status & CREG_STAT_TXDERROR)
+			printk("TXD_ERROR, ");
+		if (bmac_status & CREG_STAT_TXLERR)
+			printk("TX_LATE_ERROR, ");
+		if (bmac_status & CREG_STAT_TXPERR)
+			printk("TX_PARITY_ERROR, ");
+		if (bmac_status & CREG_STAT_TXSERR)
+			printk("TX_SBUS_ERROR, ");
+
+		if (bmac_status & CREG_STAT_RXDROP)
+			printk("RX_DROP_ERROR, ");
+
+		if (bmac_status & CREG_STAT_RXSMALL)
+			printk("RX_SMALL_ERROR, ");
+		if (bmac_status & CREG_STAT_RXLERR)
+			printk("RX_LATE_ERROR, ");
+		if (bmac_status & CREG_STAT_RXPERR)
+			printk("RX_PARITY_ERROR, ");
+		if (bmac_status & CREG_STAT_RXSERR)
+			printk("RX_SBUS_ERROR, ");
+	}
+
+	printk(" RESET\n");
+	bigmac_init_hw(bp, true);
+}
+
+/* BigMAC transmit complete service routines. */
+static void bigmac_tx(struct bigmac *bp)
+{
+	struct be_txd *txbase = &bp->bmac_block->be_txd[0];
+	struct net_device *dev = bp->dev;
+	int elem;
+
+	spin_lock(&bp->lock);
+
+	elem = bp->tx_old;
+	DTX(("bigmac_tx: tx_old[%d] ", elem));
+	while (elem != bp->tx_new) {
+		struct sk_buff *skb;
+		struct be_txd *this = &txbase[elem];
+
+		DTX(("this(%p) [flags(%08x)addr(%08x)]",
+		     this, this->tx_flags, this->tx_addr));
+
+		if (this->tx_flags & TXD_OWN)
+			break;
+		skb = bp->tx_skbs[elem];
+		dev->stats.tx_packets++;
+		dev->stats.tx_bytes += skb->len;
+		dma_unmap_single(&bp->bigmac_op->dev,
+				 this->tx_addr, skb->len,
+				 DMA_TO_DEVICE);
+
+		DTX(("skb(%p) ", skb));
+		bp->tx_skbs[elem] = NULL;
+		dev_consume_skb_irq(skb);
+
+		elem = NEXT_TX(elem);
+	}
+	DTX((" DONE, tx_old=%d\n", elem));
+	bp->tx_old = elem;
+
+	if (netif_queue_stopped(dev) &&
+	    TX_BUFFS_AVAIL(bp) > 0)
+		netif_wake_queue(bp->dev);
+
+	spin_unlock(&bp->lock);
+}
+
+/* BigMAC receive complete service routines. */
+static void bigmac_rx(struct bigmac *bp)
+{
+	struct be_rxd *rxbase = &bp->bmac_block->be_rxd[0];
+	struct be_rxd *this;
+	int elem = bp->rx_new, drops = 0;
+	u32 flags;
+
+	this = &rxbase[elem];
+	while (!((flags = this->rx_flags) & RXD_OWN)) {
+		struct sk_buff *skb;
+		int len = (flags & RXD_LENGTH); /* FCS not included */
+
+		/* Check for errors. */
+		if (len < ETH_ZLEN) {
+			bp->dev->stats.rx_errors++;
+			bp->dev->stats.rx_length_errors++;
+
+	drop_it:
+			/* Return it to the BigMAC. */
+			bp->dev->stats.rx_dropped++;
+			this->rx_flags =
+				(RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH));
+			goto next;
+		}
+		skb = bp->rx_skbs[elem];
+		if (len > RX_COPY_THRESHOLD) {
+			struct sk_buff *new_skb;
+
+			/* Now refill the entry, if we can. */
+			new_skb = big_mac_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
+			if (new_skb == NULL) {
+				drops++;
+				goto drop_it;
+			}
+			dma_unmap_single(&bp->bigmac_op->dev,
+					 this->rx_addr,
+					 RX_BUF_ALLOC_SIZE - 34,
+					 DMA_FROM_DEVICE);
+			bp->rx_skbs[elem] = new_skb;
+			skb_put(new_skb, ETH_FRAME_LEN);
+			skb_reserve(new_skb, 34);
+			this->rx_addr =
+				dma_map_single(&bp->bigmac_op->dev,
+					       new_skb->data,
+					       RX_BUF_ALLOC_SIZE - 34,
+					       DMA_FROM_DEVICE);
+			this->rx_flags =
+				(RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH));
+
+			/* Trim the original skb for the netif. */
+			skb_trim(skb, len);
+		} else {
+			struct sk_buff *copy_skb = netdev_alloc_skb(bp->dev, len + 2);
+
+			if (copy_skb == NULL) {
+				drops++;
+				goto drop_it;
+			}
+			skb_reserve(copy_skb, 2);
+			skb_put(copy_skb, len);
+			dma_sync_single_for_cpu(&bp->bigmac_op->dev,
+						this->rx_addr, len,
+						DMA_FROM_DEVICE);
+			skb_copy_to_linear_data(copy_skb, (unsigned char *)skb->data, len);
+			dma_sync_single_for_device(&bp->bigmac_op->dev,
+						   this->rx_addr, len,
+						   DMA_FROM_DEVICE);
+
+			/* Reuse original ring buffer. */
+			this->rx_flags =
+				(RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH));
+
+			skb = copy_skb;
+		}
+
+		/* No checksums done by the BigMAC ;-( */
+		skb->protocol = eth_type_trans(skb, bp->dev);
+		netif_rx(skb);
+		bp->dev->stats.rx_packets++;
+		bp->dev->stats.rx_bytes += len;
+	next:
+		elem = NEXT_RX(elem);
+		this = &rxbase[elem];
+	}
+	bp->rx_new = elem;
+	if (drops)
+		printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", bp->dev->name);
+}
+
+static irqreturn_t bigmac_interrupt(int irq, void *dev_id)
+{
+	struct bigmac *bp = (struct bigmac *) dev_id;
+	u32 qec_status, bmac_status;
+
+	DIRQ(("bigmac_interrupt: "));
+
+	/* Latch status registers now. */
+	bmac_status = sbus_readl(bp->creg + CREG_STAT);
+	qec_status = sbus_readl(bp->gregs + GLOB_STAT);
+
+	DIRQ(("qec_status=%08x bmac_status=%08x\n", qec_status, bmac_status));
+	if ((qec_status & (GLOB_STAT_ER | GLOB_STAT_BM)) ||
+	   (bmac_status & CREG_STAT_ERRORS))
+		bigmac_is_medium_rare(bp, qec_status, bmac_status);
+
+	if (bmac_status & CREG_STAT_TXIRQ)
+		bigmac_tx(bp);
+
+	if (bmac_status & CREG_STAT_RXIRQ)
+		bigmac_rx(bp);
+
+	return IRQ_HANDLED;
+}
+
+static int bigmac_open(struct net_device *dev)
+{
+	struct bigmac *bp = netdev_priv(dev);
+	int ret;
+
+	ret = request_irq(dev->irq, bigmac_interrupt, IRQF_SHARED, dev->name, bp);
+	if (ret) {
+		printk(KERN_ERR "BIGMAC: Can't order irq %d to go.\n", dev->irq);
+		return ret;
+	}
+	timer_setup(&bp->bigmac_timer, bigmac_timer, 0);
+	ret = bigmac_init_hw(bp, false);
+	if (ret)
+		free_irq(dev->irq, bp);
+	return ret;
+}
+
+static int bigmac_close(struct net_device *dev)
+{
+	struct bigmac *bp = netdev_priv(dev);
+
+	del_timer(&bp->bigmac_timer);
+	bp->timer_state = asleep;
+	bp->timer_ticks = 0;
+
+	bigmac_stop(bp);
+	bigmac_clean_rings(bp);
+	free_irq(dev->irq, bp);
+	return 0;
+}
+
+static void bigmac_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	struct bigmac *bp = netdev_priv(dev);
+
+	bigmac_init_hw(bp, true);
+	netif_wake_queue(dev);
+}
+
+/* Put a packet on the wire. */
+static netdev_tx_t
+bigmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct bigmac *bp = netdev_priv(dev);
+	int len, entry;
+	u32 mapping;
+
+	len = skb->len;
+	mapping = dma_map_single(&bp->bigmac_op->dev, skb->data,
+				 len, DMA_TO_DEVICE);
+
+	/* Avoid a race... */
+	spin_lock_irq(&bp->lock);
+	entry = bp->tx_new;
+	DTX(("bigmac_start_xmit: len(%d) entry(%d)\n", len, entry));
+	bp->bmac_block->be_txd[entry].tx_flags = TXD_UPDATE;
+	bp->tx_skbs[entry] = skb;
+	bp->bmac_block->be_txd[entry].tx_addr = mapping;
+	bp->bmac_block->be_txd[entry].tx_flags =
+		(TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH));
+	bp->tx_new = NEXT_TX(entry);
+	if (TX_BUFFS_AVAIL(bp) <= 0)
+		netif_stop_queue(dev);
+	spin_unlock_irq(&bp->lock);
+
+	/* Get it going. */
+	sbus_writel(CREG_CTRL_TWAKEUP, bp->creg + CREG_CTRL);
+
+
+	return NETDEV_TX_OK;
+}
+
+static struct net_device_stats *bigmac_get_stats(struct net_device *dev)
+{
+	struct bigmac *bp = netdev_priv(dev);
+
+	bigmac_get_counters(bp, bp->bregs);
+	return &dev->stats;
+}
+
+static void bigmac_set_multicast(struct net_device *dev)
+{
+	struct bigmac *bp = netdev_priv(dev);
+	void __iomem *bregs = bp->bregs;
+	struct netdev_hw_addr *ha;
+	u32 tmp, crc;
+
+	/* Disable the receiver.  The bit self-clears when
+	 * the operation is complete.
+	 */
+	tmp = sbus_readl(bregs + BMAC_RXCFG);
+	tmp &= ~(BIGMAC_RXCFG_ENABLE);
+	sbus_writel(tmp, bregs + BMAC_RXCFG);
+	while ((sbus_readl(bregs + BMAC_RXCFG) & BIGMAC_RXCFG_ENABLE) != 0)
+		udelay(20);
+
+	if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 64)) {
+		sbus_writel(0xffff, bregs + BMAC_HTABLE0);
+		sbus_writel(0xffff, bregs + BMAC_HTABLE1);
+		sbus_writel(0xffff, bregs + BMAC_HTABLE2);
+		sbus_writel(0xffff, bregs + BMAC_HTABLE3);
+	} else if (dev->flags & IFF_PROMISC) {
+		tmp = sbus_readl(bregs + BMAC_RXCFG);
+		tmp |= BIGMAC_RXCFG_PMISC;
+		sbus_writel(tmp, bregs + BMAC_RXCFG);
+	} else {
+		u16 hash_table[4] = { 0 };
+
+		netdev_for_each_mc_addr(ha, dev) {
+			crc = ether_crc_le(6, ha->addr);
+			crc >>= 26;
+			hash_table[crc >> 4] |= 1 << (crc & 0xf);
+		}
+		sbus_writel(hash_table[0], bregs + BMAC_HTABLE0);
+		sbus_writel(hash_table[1], bregs + BMAC_HTABLE1);
+		sbus_writel(hash_table[2], bregs + BMAC_HTABLE2);
+		sbus_writel(hash_table[3], bregs + BMAC_HTABLE3);
+	}
+
+	/* Re-enable the receiver. */
+	tmp = sbus_readl(bregs + BMAC_RXCFG);
+	tmp |= BIGMAC_RXCFG_ENABLE;
+	sbus_writel(tmp, bregs + BMAC_RXCFG);
+}
+
+/* Ethtool support... */
+static void bigmac_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	strscpy(info->driver, "sunbmac", sizeof(info->driver));
+	strscpy(info->version, "2.0", sizeof(info->version));
+}
+
+static u32 bigmac_get_link(struct net_device *dev)
+{
+	struct bigmac *bp = netdev_priv(dev);
+
+	spin_lock_irq(&bp->lock);
+	bp->sw_bmsr = bigmac_tcvr_read(bp, bp->tregs, MII_BMSR);
+	spin_unlock_irq(&bp->lock);
+
+	return (bp->sw_bmsr & BMSR_LSTATUS);
+}
+
+static const struct ethtool_ops bigmac_ethtool_ops = {
+	.get_drvinfo		= bigmac_get_drvinfo,
+	.get_link		= bigmac_get_link,
+};
+
+static const struct net_device_ops bigmac_ops = {
+	.ndo_open		= bigmac_open,
+	.ndo_stop		= bigmac_close,
+	.ndo_start_xmit		= bigmac_start_xmit,
+	.ndo_get_stats		= bigmac_get_stats,
+	.ndo_set_rx_mode	= bigmac_set_multicast,
+	.ndo_tx_timeout		= bigmac_tx_timeout,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static int bigmac_ether_init(struct platform_device *op,
+			     struct platform_device *qec_op)
+{
+	static int version_printed;
+	struct net_device *dev;
+	u8 bsizes, bsizes_more;
+	struct bigmac *bp;
+
+	/* Get a new device struct for this interface. */
+	dev = alloc_etherdev(sizeof(struct bigmac));
+	if (!dev)
+		return -ENOMEM;
+
+	if (version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+
+	eth_hw_addr_set(dev, idprom->id_ethaddr);
+
+	/* Setup softc, with backpointers to QEC and BigMAC SBUS device structs. */
+	bp = netdev_priv(dev);
+	bp->qec_op = qec_op;
+	bp->bigmac_op = op;
+
+	SET_NETDEV_DEV(dev, &op->dev);
+
+	spin_lock_init(&bp->lock);
+
+	/* Map in QEC global control registers. */
+	bp->gregs = of_ioremap(&qec_op->resource[0], 0,
+			       GLOB_REG_SIZE, "BigMAC QEC GLobal Regs");
+	if (!bp->gregs) {
+		printk(KERN_ERR "BIGMAC: Cannot map QEC global registers.\n");
+		goto fail_and_cleanup;
+	}
+
+	/* Make sure QEC is in BigMAC mode. */
+	if ((sbus_readl(bp->gregs + GLOB_CTRL) & 0xf0000000) != GLOB_CTRL_BMODE) {
+		printk(KERN_ERR "BigMAC: AIEEE, QEC is not in BigMAC mode!\n");
+		goto fail_and_cleanup;
+	}
+
+	/* Reset the QEC. */
+	if (qec_global_reset(bp->gregs))
+		goto fail_and_cleanup;
+
+	/* Get supported SBUS burst sizes. */
+	bsizes = of_getintprop_default(qec_op->dev.of_node, "burst-sizes", 0xff);
+	bsizes_more = of_getintprop_default(qec_op->dev.of_node, "burst-sizes", 0xff);
+
+	bsizes &= 0xff;
+	if (bsizes_more != 0xff)
+		bsizes &= bsizes_more;
+	if (bsizes == 0xff || (bsizes & DMA_BURST16) == 0 ||
+	    (bsizes & DMA_BURST32) == 0)
+		bsizes = (DMA_BURST32 - 1);
+	bp->bigmac_bursts = bsizes;
+
+	/* Perform QEC initialization. */
+	qec_init(bp);
+
+	/* Map in the BigMAC channel registers. */
+	bp->creg = of_ioremap(&op->resource[0], 0,
+			      CREG_REG_SIZE, "BigMAC QEC Channel Regs");
+	if (!bp->creg) {
+		printk(KERN_ERR "BIGMAC: Cannot map QEC channel registers.\n");
+		goto fail_and_cleanup;
+	}
+
+	/* Map in the BigMAC control registers. */
+	bp->bregs = of_ioremap(&op->resource[1], 0,
+			       BMAC_REG_SIZE, "BigMAC Primary Regs");
+	if (!bp->bregs) {
+		printk(KERN_ERR "BIGMAC: Cannot map BigMAC primary registers.\n");
+		goto fail_and_cleanup;
+	}
+
+	/* Map in the BigMAC transceiver registers, this is how you poke at
+	 * the BigMAC's PHY.
+	 */
+	bp->tregs = of_ioremap(&op->resource[2], 0,
+			       TCVR_REG_SIZE, "BigMAC Transceiver Regs");
+	if (!bp->tregs) {
+		printk(KERN_ERR "BIGMAC: Cannot map BigMAC transceiver registers.\n");
+		goto fail_and_cleanup;
+	}
+
+	/* Stop the BigMAC. */
+	bigmac_stop(bp);
+
+	/* Allocate transmit/receive descriptor DVMA block. */
+	bp->bmac_block = dma_alloc_coherent(&bp->bigmac_op->dev,
+					    PAGE_SIZE,
+					    &bp->bblock_dvma, GFP_ATOMIC);
+	if (bp->bmac_block == NULL || bp->bblock_dvma == 0)
+		goto fail_and_cleanup;
+
+	/* Get the board revision of this BigMAC. */
+	bp->board_rev = of_getintprop_default(bp->bigmac_op->dev.of_node,
+					      "board-version", 1);
+
+	/* Init auto-negotiation timer state. */
+	timer_setup(&bp->bigmac_timer, bigmac_timer, 0);
+	bp->timer_state = asleep;
+	bp->timer_ticks = 0;
+
+	/* Backlink to generic net device struct. */
+	bp->dev = dev;
+
+	/* Set links to our BigMAC open and close routines. */
+	dev->ethtool_ops = &bigmac_ethtool_ops;
+	dev->netdev_ops = &bigmac_ops;
+	dev->watchdog_timeo = 5*HZ;
+
+	/* Finish net device registration. */
+	dev->irq = bp->bigmac_op->archdata.irqs[0];
+	dev->dma = 0;
+
+	if (register_netdev(dev)) {
+		printk(KERN_ERR "BIGMAC: Cannot register device.\n");
+		goto fail_and_cleanup;
+	}
+
+	dev_set_drvdata(&bp->bigmac_op->dev, bp);
+
+	printk(KERN_INFO "%s: BigMAC 100baseT Ethernet %pM\n",
+	       dev->name, dev->dev_addr);
+
+	return 0;
+
+fail_and_cleanup:
+	/* Something went wrong, undo whatever we did so far. */
+	/* Free register mappings if any. */
+	if (bp->gregs)
+		of_iounmap(&qec_op->resource[0], bp->gregs, GLOB_REG_SIZE);
+	if (bp->creg)
+		of_iounmap(&op->resource[0], bp->creg, CREG_REG_SIZE);
+	if (bp->bregs)
+		of_iounmap(&op->resource[1], bp->bregs, BMAC_REG_SIZE);
+	if (bp->tregs)
+		of_iounmap(&op->resource[2], bp->tregs, TCVR_REG_SIZE);
+
+	if (bp->bmac_block)
+		dma_free_coherent(&bp->bigmac_op->dev,
+				  PAGE_SIZE,
+				  bp->bmac_block,
+				  bp->bblock_dvma);
+
+	/* This also frees the co-located private data */
+	free_netdev(dev);
+	return -ENODEV;
+}
+
+/* QEC can be the parent of either QuadEthernet or a BigMAC.  We want
+ * the latter.
+ */
+static int bigmac_sbus_probe(struct platform_device *op)
+{
+	struct device *parent = op->dev.parent;
+	struct platform_device *qec_op;
+
+	qec_op = to_platform_device(parent);
+
+	return bigmac_ether_init(op, qec_op);
+}
+
+static int bigmac_sbus_remove(struct platform_device *op)
+{
+	struct bigmac *bp = platform_get_drvdata(op);
+	struct device *parent = op->dev.parent;
+	struct net_device *net_dev = bp->dev;
+	struct platform_device *qec_op;
+
+	qec_op = to_platform_device(parent);
+
+	unregister_netdev(net_dev);
+
+	of_iounmap(&qec_op->resource[0], bp->gregs, GLOB_REG_SIZE);
+	of_iounmap(&op->resource[0], bp->creg, CREG_REG_SIZE);
+	of_iounmap(&op->resource[1], bp->bregs, BMAC_REG_SIZE);
+	of_iounmap(&op->resource[2], bp->tregs, TCVR_REG_SIZE);
+	dma_free_coherent(&op->dev,
+			  PAGE_SIZE,
+			  bp->bmac_block,
+			  bp->bblock_dvma);
+
+	free_netdev(net_dev);
+
+	return 0;
+}
+
+static const struct of_device_id bigmac_sbus_match[] = {
+	{
+		.name = "be",
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, bigmac_sbus_match);
+
+static struct platform_driver bigmac_sbus_driver = {
+	.driver = {
+		.name = "sunbmac",
+		.of_match_table = bigmac_sbus_match,
+	},
+	.probe		= bigmac_sbus_probe,
+	.remove		= bigmac_sbus_remove,
+};
+
+module_platform_driver(bigmac_sbus_driver);