Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 996 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sun/sunqe.c b/drivers/net/ethernet/sun/sunqe.c
new file mode 100644
index 000000000..6418fcc31
--- /dev/null
+++ b/drivers/net/ethernet/sun/sunqe.c
@@ -0,0 +1,996 @@
+// SPDX-License-Identifier: GPL-2.0
+/* sunqe.c: Sparc QuadEthernet 10baseT SBUS card driver.
+ *          Once again I am out to prove that every ethernet
+ *          controller out there can be most efficiently programmed
+ *          if you make it look like a LANCE.
+ *
+ * Copyright (C) 1996, 1999, 2003, 2006, 2008 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/bitops.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pgtable.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+#include <asm/idprom.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/auxio.h>
+#include <asm/irq.h>
+
+#include "sunqe.h"
+
+#define DRV_NAME	"sunqe"
+#define DRV_VERSION	"4.1"
+#define DRV_RELDATE	"August 27, 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 QuadEthernet 10baseT SBUS card driver");
+MODULE_LICENSE("GPL");
+
+static struct sunqec *root_qec_dev;
+
+static void qe_set_multicast(struct net_device *dev);
+
+#define QEC_RESET_TRIES 200
+
+static inline int qec_global_reset(void __iomem *gregs)
+{
+	int tries = QEC_RESET_TRIES;
+
+	sbus_writel(GLOB_CTRL_RESET, gregs + GLOB_CTRL);
+	while (--tries) {
+		u32 tmp = sbus_readl(gregs + GLOB_CTRL);
+		if (tmp & GLOB_CTRL_RESET) {
+			udelay(20);
+			continue;
+		}
+		break;
+	}
+	if (tries)
+		return 0;
+	printk(KERN_ERR "QuadEther: AIEEE cannot reset the QEC!\n");
+	return -1;
+}
+
+#define MACE_RESET_RETRIES 200
+#define QE_RESET_RETRIES   200
+
+static inline int qe_stop(struct sunqe *qep)
+{
+	void __iomem *cregs = qep->qcregs;
+	void __iomem *mregs = qep->mregs;
+	int tries;
+
+	/* Reset the MACE, then the QEC channel. */
+	sbus_writeb(MREGS_BCONFIG_RESET, mregs + MREGS_BCONFIG);
+	tries = MACE_RESET_RETRIES;
+	while (--tries) {
+		u8 tmp = sbus_readb(mregs + MREGS_BCONFIG);
+		if (tmp & MREGS_BCONFIG_RESET) {
+			udelay(20);
+			continue;
+		}
+		break;
+	}
+	if (!tries) {
+		printk(KERN_ERR "QuadEther: AIEEE cannot reset the MACE!\n");
+		return -1;
+	}
+
+	sbus_writel(CREG_CTRL_RESET, cregs + CREG_CTRL);
+	tries = QE_RESET_RETRIES;
+	while (--tries) {
+		u32 tmp = sbus_readl(cregs + CREG_CTRL);
+		if (tmp & CREG_CTRL_RESET) {
+			udelay(20);
+			continue;
+		}
+		break;
+	}
+	if (!tries) {
+		printk(KERN_ERR "QuadEther: Cannot reset QE channel!\n");
+		return -1;
+	}
+	return 0;
+}
+
+static void qe_init_rings(struct sunqe *qep)
+{
+	struct qe_init_block *qb = qep->qe_block;
+	struct sunqe_buffers *qbufs = qep->buffers;
+	__u32 qbufs_dvma = (__u32)qep->buffers_dvma;
+	int i;
+
+	qep->rx_new = qep->rx_old = qep->tx_new = qep->tx_old = 0;
+	memset(qb, 0, sizeof(struct qe_init_block));
+	memset(qbufs, 0, sizeof(struct sunqe_buffers));
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		qb->qe_rxd[i].rx_addr = qbufs_dvma + qebuf_offset(rx_buf, i);
+		qb->qe_rxd[i].rx_flags =
+			(RXD_OWN | ((RXD_PKT_SZ) & RXD_LENGTH));
+	}
+}
+
+static int qe_init(struct sunqe *qep, int from_irq)
+{
+	struct sunqec *qecp = qep->parent;
+	void __iomem *cregs = qep->qcregs;
+	void __iomem *mregs = qep->mregs;
+	void __iomem *gregs = qecp->gregs;
+	const unsigned char *e = &qep->dev->dev_addr[0];
+	__u32 qblk_dvma = (__u32)qep->qblock_dvma;
+	u32 tmp;
+	int i;
+
+	/* Shut it up. */
+	if (qe_stop(qep))
+		return -EAGAIN;
+
+	/* Setup initial rx/tx init block pointers. */
+	sbus_writel(qblk_dvma + qib_offset(qe_rxd, 0), cregs + CREG_RXDS);
+	sbus_writel(qblk_dvma + qib_offset(qe_txd, 0), cregs + CREG_TXDS);
+
+	/* Enable/mask the various irq's. */
+	sbus_writel(0, cregs + CREG_RIMASK);
+	sbus_writel(1, cregs + CREG_TIMASK);
+
+	sbus_writel(0, cregs + CREG_QMASK);
+	sbus_writel(CREG_MMASK_RXCOLL, cregs + CREG_MMASK);
+
+	/* Setup the FIFO pointers into QEC local memory. */
+	tmp = qep->channel * sbus_readl(gregs + GLOB_MSIZE);
+	sbus_writel(tmp, cregs + CREG_RXRBUFPTR);
+	sbus_writel(tmp, cregs + CREG_RXWBUFPTR);
+
+	tmp = sbus_readl(cregs + CREG_RXRBUFPTR) +
+		sbus_readl(gregs + GLOB_RSIZE);
+	sbus_writel(tmp, cregs + CREG_TXRBUFPTR);
+	sbus_writel(tmp, cregs + CREG_TXWBUFPTR);
+
+	/* Clear the channel collision counter. */
+	sbus_writel(0, cregs + CREG_CCNT);
+
+	/* For 10baseT, inter frame space nor throttle seems to be necessary. */
+	sbus_writel(0, cregs + CREG_PIPG);
+
+	/* Now dork with the AMD MACE. */
+	sbus_writeb(MREGS_PHYCONFIG_AUTO, mregs + MREGS_PHYCONFIG);
+	sbus_writeb(MREGS_TXFCNTL_AUTOPAD, mregs + MREGS_TXFCNTL);
+	sbus_writeb(0, mregs + MREGS_RXFCNTL);
+
+	/* The QEC dma's the rx'd packets from local memory out to main memory,
+	 * and therefore it interrupts when the packet reception is "complete".
+	 * So don't listen for the MACE talking about it.
+	 */
+	sbus_writeb(MREGS_IMASK_COLL | MREGS_IMASK_RXIRQ, mregs + MREGS_IMASK);
+	sbus_writeb(MREGS_BCONFIG_BSWAP | MREGS_BCONFIG_64TS, mregs + MREGS_BCONFIG);
+	sbus_writeb((MREGS_FCONFIG_TXF16 | MREGS_FCONFIG_RXF32 |
+		     MREGS_FCONFIG_RFWU | MREGS_FCONFIG_TFWU),
+		    mregs + MREGS_FCONFIG);
+
+	/* Only usable interface on QuadEther is twisted pair. */
+	sbus_writeb(MREGS_PLSCONFIG_TP, mregs + MREGS_PLSCONFIG);
+
+	/* Tell MACE we are changing the ether address. */
+	sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_PARESET,
+		    mregs + MREGS_IACONFIG);
+	while ((sbus_readb(mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
+		barrier();
+	sbus_writeb(e[0], mregs + MREGS_ETHADDR);
+	sbus_writeb(e[1], mregs + MREGS_ETHADDR);
+	sbus_writeb(e[2], mregs + MREGS_ETHADDR);
+	sbus_writeb(e[3], mregs + MREGS_ETHADDR);
+	sbus_writeb(e[4], mregs + MREGS_ETHADDR);
+	sbus_writeb(e[5], mregs + MREGS_ETHADDR);
+
+	/* Clear out the address filter. */
+	sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
+		    mregs + MREGS_IACONFIG);
+	while ((sbus_readb(mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
+		barrier();
+	for (i = 0; i < 8; i++)
+		sbus_writeb(0, mregs + MREGS_FILTER);
+
+	/* Address changes are now complete. */
+	sbus_writeb(0, mregs + MREGS_IACONFIG);
+
+	qe_init_rings(qep);
+
+	/* Wait a little bit for the link to come up... */
+	mdelay(5);
+	if (!(sbus_readb(mregs + MREGS_PHYCONFIG) & MREGS_PHYCONFIG_LTESTDIS)) {
+		int tries = 50;
+
+		while (--tries) {
+			u8 tmp;
+
+			mdelay(5);
+			barrier();
+			tmp = sbus_readb(mregs + MREGS_PHYCONFIG);
+			if ((tmp & MREGS_PHYCONFIG_LSTAT) != 0)
+				break;
+		}
+		if (tries == 0)
+			printk(KERN_NOTICE "%s: Warning, link state is down.\n", qep->dev->name);
+	}
+
+	/* Missed packet counter is cleared on a read. */
+	sbus_readb(mregs + MREGS_MPCNT);
+
+	/* Reload multicast information, this will enable the receiver
+	 * and transmitter.
+	 */
+	qe_set_multicast(qep->dev);
+
+	/* QEC should now start to show interrupts. */
+	return 0;
+}
+
+/* Grrr, certain error conditions completely lock up the AMD MACE,
+ * so when we get these we _must_ reset the chip.
+ */
+static int qe_is_bolixed(struct sunqe *qep, u32 qe_status)
+{
+	struct net_device *dev = qep->dev;
+	int mace_hwbug_workaround = 0;
+
+	if (qe_status & CREG_STAT_EDEFER) {
+		printk(KERN_ERR "%s: Excessive transmit defers.\n", dev->name);
+		dev->stats.tx_errors++;
+	}
+
+	if (qe_status & CREG_STAT_CLOSS) {
+		printk(KERN_ERR "%s: Carrier lost, link down?\n", dev->name);
+		dev->stats.tx_errors++;
+		dev->stats.tx_carrier_errors++;
+	}
+
+	if (qe_status & CREG_STAT_ERETRIES) {
+		printk(KERN_ERR "%s: Excessive transmit retries (more than 16).\n", dev->name);
+		dev->stats.tx_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_LCOLL) {
+		printk(KERN_ERR "%s: Late transmit collision.\n", dev->name);
+		dev->stats.tx_errors++;
+		dev->stats.collisions++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_FUFLOW) {
+		printk(KERN_ERR "%s: Transmit fifo underflow, driver bug.\n", dev->name);
+		dev->stats.tx_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_JERROR) {
+		printk(KERN_ERR "%s: Jabber error.\n", dev->name);
+	}
+
+	if (qe_status & CREG_STAT_BERROR) {
+		printk(KERN_ERR "%s: Babble error.\n", dev->name);
+	}
+
+	if (qe_status & CREG_STAT_CCOFLOW) {
+		dev->stats.tx_errors += 256;
+		dev->stats.collisions += 256;
+	}
+
+	if (qe_status & CREG_STAT_TXDERROR) {
+		printk(KERN_ERR "%s: Transmit descriptor is bogus, driver bug.\n", dev->name);
+		dev->stats.tx_errors++;
+		dev->stats.tx_aborted_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_TXLERR) {
+		printk(KERN_ERR "%s: Transmit late error.\n", dev->name);
+		dev->stats.tx_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_TXPERR) {
+		printk(KERN_ERR "%s: Transmit DMA parity error.\n", dev->name);
+		dev->stats.tx_errors++;
+		dev->stats.tx_aborted_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_TXSERR) {
+		printk(KERN_ERR "%s: Transmit DMA sbus error ack.\n", dev->name);
+		dev->stats.tx_errors++;
+		dev->stats.tx_aborted_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_RCCOFLOW) {
+		dev->stats.rx_errors += 256;
+		dev->stats.collisions += 256;
+	}
+
+	if (qe_status & CREG_STAT_RUOFLOW) {
+		dev->stats.rx_errors += 256;
+		dev->stats.rx_over_errors += 256;
+	}
+
+	if (qe_status & CREG_STAT_MCOFLOW) {
+		dev->stats.rx_errors += 256;
+		dev->stats.rx_missed_errors += 256;
+	}
+
+	if (qe_status & CREG_STAT_RXFOFLOW) {
+		printk(KERN_ERR "%s: Receive fifo overflow.\n", dev->name);
+		dev->stats.rx_errors++;
+		dev->stats.rx_over_errors++;
+	}
+
+	if (qe_status & CREG_STAT_RLCOLL) {
+		printk(KERN_ERR "%s: Late receive collision.\n", dev->name);
+		dev->stats.rx_errors++;
+		dev->stats.collisions++;
+	}
+
+	if (qe_status & CREG_STAT_FCOFLOW) {
+		dev->stats.rx_errors += 256;
+		dev->stats.rx_frame_errors += 256;
+	}
+
+	if (qe_status & CREG_STAT_CECOFLOW) {
+		dev->stats.rx_errors += 256;
+		dev->stats.rx_crc_errors += 256;
+	}
+
+	if (qe_status & CREG_STAT_RXDROP) {
+		printk(KERN_ERR "%s: Receive packet dropped.\n", dev->name);
+		dev->stats.rx_errors++;
+		dev->stats.rx_dropped++;
+		dev->stats.rx_missed_errors++;
+	}
+
+	if (qe_status & CREG_STAT_RXSMALL) {
+		printk(KERN_ERR "%s: Receive buffer too small, driver bug.\n", dev->name);
+		dev->stats.rx_errors++;
+		dev->stats.rx_length_errors++;
+	}
+
+	if (qe_status & CREG_STAT_RXLERR) {
+		printk(KERN_ERR "%s: Receive late error.\n", dev->name);
+		dev->stats.rx_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_RXPERR) {
+		printk(KERN_ERR "%s: Receive DMA parity error.\n", dev->name);
+		dev->stats.rx_errors++;
+		dev->stats.rx_missed_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (qe_status & CREG_STAT_RXSERR) {
+		printk(KERN_ERR "%s: Receive DMA sbus error ack.\n", dev->name);
+		dev->stats.rx_errors++;
+		dev->stats.rx_missed_errors++;
+		mace_hwbug_workaround = 1;
+	}
+
+	if (mace_hwbug_workaround)
+		qe_init(qep, 1);
+	return mace_hwbug_workaround;
+}
+
+/* Per-QE receive interrupt service routine.  Just like on the happy meal
+ * we receive directly into skb's with a small packet copy water mark.
+ */
+static void qe_rx(struct sunqe *qep)
+{
+	struct qe_rxd *rxbase = &qep->qe_block->qe_rxd[0];
+	struct net_device *dev = qep->dev;
+	struct qe_rxd *this;
+	struct sunqe_buffers *qbufs = qep->buffers;
+	__u32 qbufs_dvma = (__u32)qep->buffers_dvma;
+	int elem = qep->rx_new;
+	u32 flags;
+
+	this = &rxbase[elem];
+	while (!((flags = this->rx_flags) & RXD_OWN)) {
+		struct sk_buff *skb;
+		unsigned char *this_qbuf =
+			&qbufs->rx_buf[elem & (RX_RING_SIZE - 1)][0];
+		__u32 this_qbuf_dvma = qbufs_dvma +
+			qebuf_offset(rx_buf, (elem & (RX_RING_SIZE - 1)));
+		struct qe_rxd *end_rxd =
+			&rxbase[(elem+RX_RING_SIZE)&(RX_RING_MAXSIZE-1)];
+		int len = (flags & RXD_LENGTH) - 4;  /* QE adds ether FCS size to len */
+
+		/* Check for errors. */
+		if (len < ETH_ZLEN) {
+			dev->stats.rx_errors++;
+			dev->stats.rx_length_errors++;
+			dev->stats.rx_dropped++;
+		} else {
+			skb = netdev_alloc_skb(dev, len + 2);
+			if (skb == NULL) {
+				dev->stats.rx_dropped++;
+			} else {
+				skb_reserve(skb, 2);
+				skb_put(skb, len);
+				skb_copy_to_linear_data(skb, this_qbuf,
+						 len);
+				skb->protocol = eth_type_trans(skb, qep->dev);
+				netif_rx(skb);
+				dev->stats.rx_packets++;
+				dev->stats.rx_bytes += len;
+			}
+		}
+		end_rxd->rx_addr = this_qbuf_dvma;
+		end_rxd->rx_flags = (RXD_OWN | ((RXD_PKT_SZ) & RXD_LENGTH));
+
+		elem = NEXT_RX(elem);
+		this = &rxbase[elem];
+	}
+	qep->rx_new = elem;
+}
+
+static void qe_tx_reclaim(struct sunqe *qep);
+
+/* Interrupts for all QE's get filtered out via the QEC master controller,
+ * so we just run through each qe and check to see who is signaling
+ * and thus needs to be serviced.
+ */
+static irqreturn_t qec_interrupt(int irq, void *dev_id)
+{
+	struct sunqec *qecp = dev_id;
+	u32 qec_status;
+	int channel = 0;
+
+	/* Latch the status now. */
+	qec_status = sbus_readl(qecp->gregs + GLOB_STAT);
+	while (channel < 4) {
+		if (qec_status & 0xf) {
+			struct sunqe *qep = qecp->qes[channel];
+			u32 qe_status;
+
+			qe_status = sbus_readl(qep->qcregs + CREG_STAT);
+			if (qe_status & CREG_STAT_ERRORS) {
+				if (qe_is_bolixed(qep, qe_status))
+					goto next;
+			}
+			if (qe_status & CREG_STAT_RXIRQ)
+				qe_rx(qep);
+			if (netif_queue_stopped(qep->dev) &&
+			    (qe_status & CREG_STAT_TXIRQ)) {
+				spin_lock(&qep->lock);
+				qe_tx_reclaim(qep);
+				if (TX_BUFFS_AVAIL(qep) > 0) {
+					/* Wake net queue and return to
+					 * lazy tx reclaim.
+					 */
+					netif_wake_queue(qep->dev);
+					sbus_writel(1, qep->qcregs + CREG_TIMASK);
+				}
+				spin_unlock(&qep->lock);
+			}
+	next:
+			;
+		}
+		qec_status >>= 4;
+		channel++;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int qe_open(struct net_device *dev)
+{
+	struct sunqe *qep = netdev_priv(dev);
+
+	qep->mconfig = (MREGS_MCONFIG_TXENAB |
+			MREGS_MCONFIG_RXENAB |
+			MREGS_MCONFIG_MBAENAB);
+	return qe_init(qep, 0);
+}
+
+static int qe_close(struct net_device *dev)
+{
+	struct sunqe *qep = netdev_priv(dev);
+
+	qe_stop(qep);
+	return 0;
+}
+
+/* Reclaim TX'd frames from the ring.  This must always run under
+ * the IRQ protected qep->lock.
+ */
+static void qe_tx_reclaim(struct sunqe *qep)
+{
+	struct qe_txd *txbase = &qep->qe_block->qe_txd[0];
+	int elem = qep->tx_old;
+
+	while (elem != qep->tx_new) {
+		u32 flags = txbase[elem].tx_flags;
+
+		if (flags & TXD_OWN)
+			break;
+		elem = NEXT_TX(elem);
+	}
+	qep->tx_old = elem;
+}
+
+static void qe_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	struct sunqe *qep = netdev_priv(dev);
+	int tx_full;
+
+	spin_lock_irq(&qep->lock);
+
+	/* Try to reclaim, if that frees up some tx
+	 * entries, we're fine.
+	 */
+	qe_tx_reclaim(qep);
+	tx_full = TX_BUFFS_AVAIL(qep) <= 0;
+
+	spin_unlock_irq(&qep->lock);
+
+	if (! tx_full)
+		goto out;
+
+	printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
+	qe_init(qep, 1);
+
+out:
+	netif_wake_queue(dev);
+}
+
+/* Get a packet queued to go onto the wire. */
+static netdev_tx_t qe_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct sunqe *qep = netdev_priv(dev);
+	struct sunqe_buffers *qbufs = qep->buffers;
+	__u32 txbuf_dvma, qbufs_dvma = (__u32)qep->buffers_dvma;
+	unsigned char *txbuf;
+	int len, entry;
+
+	spin_lock_irq(&qep->lock);
+
+	qe_tx_reclaim(qep);
+
+	len = skb->len;
+	entry = qep->tx_new;
+
+	txbuf = &qbufs->tx_buf[entry & (TX_RING_SIZE - 1)][0];
+	txbuf_dvma = qbufs_dvma +
+		qebuf_offset(tx_buf, (entry & (TX_RING_SIZE - 1)));
+
+	/* Avoid a race... */
+	qep->qe_block->qe_txd[entry].tx_flags = TXD_UPDATE;
+
+	skb_copy_from_linear_data(skb, txbuf, len);
+
+	qep->qe_block->qe_txd[entry].tx_addr = txbuf_dvma;
+	qep->qe_block->qe_txd[entry].tx_flags =
+		(TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH));
+	qep->tx_new = NEXT_TX(entry);
+
+	/* Get it going. */
+	sbus_writel(CREG_CTRL_TWAKEUP, qep->qcregs + CREG_CTRL);
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += len;
+
+	if (TX_BUFFS_AVAIL(qep) <= 0) {
+		/* Halt the net queue and enable tx interrupts.
+		 * When the tx queue empties the tx irq handler
+		 * will wake up the queue and return us back to
+		 * the lazy tx reclaim scheme.
+		 */
+		netif_stop_queue(dev);
+		sbus_writel(0, qep->qcregs + CREG_TIMASK);
+	}
+	spin_unlock_irq(&qep->lock);
+
+	dev_kfree_skb(skb);
+
+	return NETDEV_TX_OK;
+}
+
+static void qe_set_multicast(struct net_device *dev)
+{
+	struct sunqe *qep = netdev_priv(dev);
+	struct netdev_hw_addr *ha;
+	u8 new_mconfig = qep->mconfig;
+	int i;
+	u32 crc;
+
+	/* Lock out others. */
+	netif_stop_queue(dev);
+
+	if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 64)) {
+		sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
+			    qep->mregs + MREGS_IACONFIG);
+		while ((sbus_readb(qep->mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
+			barrier();
+		for (i = 0; i < 8; i++)
+			sbus_writeb(0xff, qep->mregs + MREGS_FILTER);
+		sbus_writeb(0, qep->mregs + MREGS_IACONFIG);
+	} else if (dev->flags & IFF_PROMISC) {
+		new_mconfig |= MREGS_MCONFIG_PROMISC;
+	} else {
+		u16 hash_table[4];
+		u8 *hbytes = (unsigned char *) &hash_table[0];
+
+		memset(hash_table, 0, sizeof(hash_table));
+		netdev_for_each_mc_addr(ha, dev) {
+			crc = ether_crc_le(6, ha->addr);
+			crc >>= 26;
+			hash_table[crc >> 4] |= 1 << (crc & 0xf);
+		}
+		/* Program the qe with the new filter value. */
+		sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
+			    qep->mregs + MREGS_IACONFIG);
+		while ((sbus_readb(qep->mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
+			barrier();
+		for (i = 0; i < 8; i++) {
+			u8 tmp = *hbytes++;
+			sbus_writeb(tmp, qep->mregs + MREGS_FILTER);
+		}
+		sbus_writeb(0, qep->mregs + MREGS_IACONFIG);
+	}
+
+	/* Any change of the logical address filter, the physical address,
+	 * or enabling/disabling promiscuous mode causes the MACE to disable
+	 * the receiver.  So we must re-enable them here or else the MACE
+	 * refuses to listen to anything on the network.  Sheesh, took
+	 * me a day or two to find this bug.
+	 */
+	qep->mconfig = new_mconfig;
+	sbus_writeb(qep->mconfig, qep->mregs + MREGS_MCONFIG);
+
+	/* Let us get going again. */
+	netif_wake_queue(dev);
+}
+
+/* Ethtool support... */
+static void qe_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	const struct linux_prom_registers *regs;
+	struct sunqe *qep = netdev_priv(dev);
+	struct platform_device *op;
+
+	strscpy(info->driver, "sunqe", sizeof(info->driver));
+	strscpy(info->version, "3.0", sizeof(info->version));
+
+	op = qep->op;
+	regs = of_get_property(op->dev.of_node, "reg", NULL);
+	if (regs)
+		snprintf(info->bus_info, sizeof(info->bus_info), "SBUS:%d",
+			 regs->which_io);
+
+}
+
+static u32 qe_get_link(struct net_device *dev)
+{
+	struct sunqe *qep = netdev_priv(dev);
+	void __iomem *mregs = qep->mregs;
+	u8 phyconfig;
+
+	spin_lock_irq(&qep->lock);
+	phyconfig = sbus_readb(mregs + MREGS_PHYCONFIG);
+	spin_unlock_irq(&qep->lock);
+
+	return phyconfig & MREGS_PHYCONFIG_LSTAT;
+}
+
+static const struct ethtool_ops qe_ethtool_ops = {
+	.get_drvinfo		= qe_get_drvinfo,
+	.get_link		= qe_get_link,
+};
+
+/* This is only called once at boot time for each card probed. */
+static void qec_init_once(struct sunqec *qecp, struct platform_device *op)
+{
+	u8 bsizes = qecp->qec_bursts;
+
+	if (sbus_can_burst64() && (bsizes & DMA_BURST64)) {
+		sbus_writel(GLOB_CTRL_B64, qecp->gregs + GLOB_CTRL);
+	} else if (bsizes & DMA_BURST32) {
+		sbus_writel(GLOB_CTRL_B32, qecp->gregs + GLOB_CTRL);
+	} else {
+		sbus_writel(GLOB_CTRL_B16, qecp->gregs + GLOB_CTRL);
+	}
+
+	/* Packetsize only used in 100baseT BigMAC configurations,
+	 * set it to zero just to be on the safe side.
+	 */
+	sbus_writel(GLOB_PSIZE_2048, qecp->gregs + GLOB_PSIZE);
+
+	/* Set the local memsize register, divided up to one piece per QE channel. */
+	sbus_writel((resource_size(&op->resource[1]) >> 2),
+		    qecp->gregs + GLOB_MSIZE);
+
+	/* Divide up the local QEC memory amongst the 4 QE receiver and
+	 * transmitter FIFOs.  Basically it is (total / 2 / num_channels).
+	 */
+	sbus_writel((resource_size(&op->resource[1]) >> 2) >> 1,
+		    qecp->gregs + GLOB_TSIZE);
+	sbus_writel((resource_size(&op->resource[1]) >> 2) >> 1,
+		    qecp->gregs + GLOB_RSIZE);
+}
+
+static u8 qec_get_burst(struct device_node *dp)
+{
+	u8 bsizes, bsizes_more;
+
+	/* Find and set the burst sizes for the QEC, since it
+	 * does the actual dma for all 4 channels.
+	 */
+	bsizes = of_getintprop_default(dp, "burst-sizes", 0xff);
+	bsizes &= 0xff;
+	bsizes_more = of_getintprop_default(dp->parent, "burst-sizes", 0xff);
+
+	if (bsizes_more != 0xff)
+		bsizes &= bsizes_more;
+	if (bsizes == 0xff || (bsizes & DMA_BURST16) == 0 ||
+	    (bsizes & DMA_BURST32)==0)
+		bsizes = (DMA_BURST32 - 1);
+
+	return bsizes;
+}
+
+static struct sunqec *get_qec(struct platform_device *child)
+{
+	struct platform_device *op = to_platform_device(child->dev.parent);
+	struct sunqec *qecp;
+
+	qecp = platform_get_drvdata(op);
+	if (!qecp) {
+		qecp = kzalloc(sizeof(struct sunqec), GFP_KERNEL);
+		if (qecp) {
+			u32 ctrl;
+
+			qecp->op = op;
+			qecp->gregs = of_ioremap(&op->resource[0], 0,
+						 GLOB_REG_SIZE,
+						 "QEC Global Registers");
+			if (!qecp->gregs)
+				goto fail;
+
+			/* Make sure the QEC is in MACE mode. */
+			ctrl = sbus_readl(qecp->gregs + GLOB_CTRL);
+			ctrl &= 0xf0000000;
+			if (ctrl != GLOB_CTRL_MMODE) {
+				printk(KERN_ERR "qec: Not in MACE mode!\n");
+				goto fail;
+			}
+
+			if (qec_global_reset(qecp->gregs))
+				goto fail;
+
+			qecp->qec_bursts = qec_get_burst(op->dev.of_node);
+
+			qec_init_once(qecp, op);
+
+			if (request_irq(op->archdata.irqs[0], qec_interrupt,
+					IRQF_SHARED, "qec", (void *) qecp)) {
+				printk(KERN_ERR "qec: Can't register irq.\n");
+				goto fail;
+			}
+
+			platform_set_drvdata(op, qecp);
+
+			qecp->next_module = root_qec_dev;
+			root_qec_dev = qecp;
+		}
+	}
+
+	return qecp;
+
+fail:
+	if (qecp->gregs)
+		of_iounmap(&op->resource[0], qecp->gregs, GLOB_REG_SIZE);
+	kfree(qecp);
+	return NULL;
+}
+
+static const struct net_device_ops qec_ops = {
+	.ndo_open		= qe_open,
+	.ndo_stop		= qe_close,
+	.ndo_start_xmit		= qe_start_xmit,
+	.ndo_set_rx_mode	= qe_set_multicast,
+	.ndo_tx_timeout		= qe_tx_timeout,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static int qec_ether_init(struct platform_device *op)
+{
+	static unsigned version_printed;
+	struct net_device *dev;
+	struct sunqec *qecp;
+	struct sunqe *qe;
+	int i, res;
+
+	if (version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+
+	dev = alloc_etherdev(sizeof(struct sunqe));
+	if (!dev)
+		return -ENOMEM;
+
+	eth_hw_addr_set(dev, idprom->id_ethaddr);
+
+	qe = netdev_priv(dev);
+
+	res = -ENODEV;
+
+	i = of_getintprop_default(op->dev.of_node, "channel#", -1);
+	if (i == -1)
+		goto fail;
+	qe->channel = i;
+	spin_lock_init(&qe->lock);
+
+	qecp = get_qec(op);
+	if (!qecp)
+		goto fail;
+
+	qecp->qes[qe->channel] = qe;
+	qe->dev = dev;
+	qe->parent = qecp;
+	qe->op = op;
+
+	res = -ENOMEM;
+	qe->qcregs = of_ioremap(&op->resource[0], 0,
+				CREG_REG_SIZE, "QEC Channel Registers");
+	if (!qe->qcregs) {
+		printk(KERN_ERR "qe: Cannot map channel registers.\n");
+		goto fail;
+	}
+
+	qe->mregs = of_ioremap(&op->resource[1], 0,
+			       MREGS_REG_SIZE, "QE MACE Registers");
+	if (!qe->mregs) {
+		printk(KERN_ERR "qe: Cannot map MACE registers.\n");
+		goto fail;
+	}
+
+	qe->qe_block = dma_alloc_coherent(&op->dev, PAGE_SIZE,
+					  &qe->qblock_dvma, GFP_ATOMIC);
+	qe->buffers = dma_alloc_coherent(&op->dev, sizeof(struct sunqe_buffers),
+					 &qe->buffers_dvma, GFP_ATOMIC);
+	if (qe->qe_block == NULL || qe->qblock_dvma == 0 ||
+	    qe->buffers == NULL || qe->buffers_dvma == 0)
+		goto fail;
+
+	/* Stop this QE. */
+	qe_stop(qe);
+
+	SET_NETDEV_DEV(dev, &op->dev);
+
+	dev->watchdog_timeo = 5*HZ;
+	dev->irq = op->archdata.irqs[0];
+	dev->dma = 0;
+	dev->ethtool_ops = &qe_ethtool_ops;
+	dev->netdev_ops = &qec_ops;
+
+	res = register_netdev(dev);
+	if (res)
+		goto fail;
+
+	platform_set_drvdata(op, qe);
+
+	printk(KERN_INFO "%s: qe channel[%d] %pM\n", dev->name, qe->channel,
+	       dev->dev_addr);
+	return 0;
+
+fail:
+	if (qe->qcregs)
+		of_iounmap(&op->resource[0], qe->qcregs, CREG_REG_SIZE);
+	if (qe->mregs)
+		of_iounmap(&op->resource[1], qe->mregs, MREGS_REG_SIZE);
+	if (qe->qe_block)
+		dma_free_coherent(&op->dev, PAGE_SIZE,
+				  qe->qe_block, qe->qblock_dvma);
+	if (qe->buffers)
+		dma_free_coherent(&op->dev,
+				  sizeof(struct sunqe_buffers),
+				  qe->buffers,
+				  qe->buffers_dvma);
+
+	free_netdev(dev);
+
+	return res;
+}
+
+static int qec_sbus_probe(struct platform_device *op)
+{
+	return qec_ether_init(op);
+}
+
+static int qec_sbus_remove(struct platform_device *op)
+{
+	struct sunqe *qp = platform_get_drvdata(op);
+	struct net_device *net_dev = qp->dev;
+
+	unregister_netdev(net_dev);
+
+	of_iounmap(&op->resource[0], qp->qcregs, CREG_REG_SIZE);
+	of_iounmap(&op->resource[1], qp->mregs, MREGS_REG_SIZE);
+	dma_free_coherent(&op->dev, PAGE_SIZE,
+			  qp->qe_block, qp->qblock_dvma);
+	dma_free_coherent(&op->dev, sizeof(struct sunqe_buffers),
+			  qp->buffers, qp->buffers_dvma);
+
+	free_netdev(net_dev);
+
+	return 0;
+}
+
+static const struct of_device_id qec_sbus_match[] = {
+	{
+		.name = "qe",
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, qec_sbus_match);
+
+static struct platform_driver qec_sbus_driver = {
+	.driver = {
+		.name = "qec",
+		.of_match_table = qec_sbus_match,
+	},
+	.probe		= qec_sbus_probe,
+	.remove		= qec_sbus_remove,
+};
+
+static int __init qec_init(void)
+{
+	return platform_driver_register(&qec_sbus_driver);
+}
+
+static void __exit qec_exit(void)
+{
+	platform_driver_unregister(&qec_sbus_driver);
+
+	while (root_qec_dev) {
+		struct sunqec *next = root_qec_dev->next_module;
+		struct platform_device *op = root_qec_dev->op;
+
+		free_irq(op->archdata.irqs[0], (void *) root_qec_dev);
+		of_iounmap(&op->resource[0], root_qec_dev->gregs,
+			   GLOB_REG_SIZE);
+		kfree(root_qec_dev);
+
+		root_qec_dev = next;
+	}
+}
+
+module_init(qec_init);
+module_exit(qec_exit);