Re: [PATCH RFC v2] net: add PCINet driver

[Ira Snyder]

On Wed, Oct 29, 2008 at 04:43:46PM -0500, Matt Sealey wrote:
>
> Ira Snyder wrote:
>>
>> I'll go ahead change the typedef to a struct. Hopefully some of the
>> other inspiration I took wasn't too bad. I'm totally open to suggestions
>> on improvements for this driver.
>
> Not a suggestion for improvement, but I have to say this is by far the
> single coolest thing I have EVER seen submitted to mainline :)
>

Awesome, that's what I like to hear!

Here is another quick version of the patch, just for fun. There are only
two changes from the original patch, which I didn't think are big enough
to start another thread.

1) Use struct circ_buf_desc instead of cbd_t
2) Use get_immrbase() to get the IMMR register address

Ira

======================================================================

[PATCH] net: add PCINet driver

This adds support to Linux for a virtual ethernet interface which uses the
PCI bus as its transport mechanism. It creates a simple, familiar, and fast
method of communication for two devices connected by a PCI interface.

I have implemented client support for the Freescale MPC8349EMDS board,
which is capable of running in PCI Agent mode (It acts like a PCI card, but
is a complete PowerPC computer, running Linux). It is almost certainly
trivially ported to any MPC83xx system.

It was developed to work in a CompactPCI crate of computers, one of which
is a relatively standard x86 system (acting as the host) and many PowerPC
systems (acting as clients).

RFC v2 -> RFC v3pre:
  * replace typedef cbd_t with struct circ_buf_desc
  * use get_immrbase() to get IMMR register offsets

RFC v1 -> RFC v2:
  * remove vim modelines
  * use net_device->name in request_irq(), for irqbalance
  * remove unneccesary wqt_get_stats(), use default get_stats() instead
  * use dev_printk() and friends
  * add message unit to MPC8349EMDS dts file

Signed-off-by: Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
---
 arch/powerpc/boot/dts/mpc834x_mds.dts |    7 +
 drivers/net/Kconfig                   |   34 +
 drivers/net/Makefile                  |    3 +
 drivers/net/pcinet.h                  |   74 ++
 drivers/net/pcinet_fsl.c              | 1354 ++++++++++++++++++++++++++++++++
 drivers/net/pcinet_host.c             | 1383 +++++++++++++++++++++++++++++++++
 drivers/net/pcinet_hw.h               |   77 ++
 7 files changed, 2932 insertions(+), 0 deletions(-)
 create mode 100644 drivers/net/pcinet.h
 create mode 100644 drivers/net/pcinet_fsl.c
 create mode 100644 drivers/net/pcinet_host.c
 create mode 100644 drivers/net/pcinet_hw.h

diff --git a/arch/powerpc/boot/dts/mpc834x_mds.dts b/arch/powerpc/boot/dts/mpc834x_mds.dts
index c986c54..3bc8975 100644
--- a/arch/powerpc/boot/dts/mpc834x_mds.dts
+++ b/arch/powerpc/boot/dts/mpc834x_mds.dts
@@ -104,6 +104,13 @@
 			mode = "cpu";
 		};
 
+		message-unit@8030 {
+			compatible = "fsl,mpc8349-mu";
+			reg = <0x8030 0xd0>;
+			interrupts = <69 0x8>;
+			interrupt-parent = <&ipic>;
+		};
+
 		dma@82a8 {
 			#address-cells = <1>;
 			#size-cells = <1>;
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f749b40..eef7af7 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2279,6 +2279,40 @@ config UGETH_TX_ON_DEMAND
 	bool "Transmit on Demand support"
 	depends on UCC_GETH
 
+config PCINET_FSL
+	tristate "PCINet Virtual Ethernet over PCI support (Freescale)"
+	depends on MPC834x_MDS && !PCI
+	select DMA_ENGINE
+	select FSL_DMA
+	help
+	  When running as a PCI Agent, this driver will create a virtual
+	  ethernet link running over the PCI bus, allowing simplified
+	  communication with the host system. The host system will need
+	  to use the corresponding driver.
+
+	  If in doubt, say N.
+
+config PCINET_HOST
+	tristate "PCINet Virtual Ethernet over PCI support (Host)"
+	depends on PCI
+	help
+	  This driver will let you communicate with a PCINet client device
+	  using a virtual ethernet link running over the PCI bus. This
+	  allows simplified communication with the client system.
+
+	  This is inteded for use in a system that has a crate full of
+	  computers running Linux, all connected by a PCI backplane.
+
+	  If in doubt, say N.
+
+config PCINET_DISABLE_CHECKSUM
+	bool "Disable packet checksumming"
+	depends on PCINET_FSL || PCINET_HOST
+	default n
+	help
+	  Disable packet checksumming on packets received by the PCINet
+	  driver. This gives a possible speed boost.
+
 config MV643XX_ETH
 	tristate "Marvell Discovery (643XX) and Orion ethernet support"
 	depends on MV64360 || MV64X60 || (PPC_MULTIPLATFORM && PPC32) || PLAT_ORION
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index f19acf8..c6fbafc 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -30,6 +30,9 @@ gianfar_driver-objs := gianfar.o \
 obj-$(CONFIG_UCC_GETH) += ucc_geth_driver.o
 ucc_geth_driver-objs := ucc_geth.o ucc_geth_mii.o ucc_geth_ethtool.o
 
+obj-$(CONFIG_PCINET_FSL) += pcinet_fsl.o
+obj-$(CONFIG_PCINET_HOST) += pcinet_host.o
+
 #
 # link order important here
 #
diff --git a/drivers/net/pcinet.h b/drivers/net/pcinet.h
new file mode 100644
index 0000000..054a0ee
--- /dev/null
+++ b/drivers/net/pcinet.h
@@ -0,0 +1,74 @@
+/*
+ * Shared Definitions for the PCINet / PCISerial drivers
+ *
+ * Copyright (c) 2008 Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
+ *
+ * Heavily inspired by the drivers/net/fs_enet driver
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef PCINET_H
+#define PCINET_H
+
+#include <linux/kernel.h>
+#include <linux/if_ether.h>
+
+/* Ring and Frame size -- these must match between the drivers */
+#define PH_RING_SIZE	(64)
+#define PH_MAX_FRSIZE	(64 * 1024)
+#define PH_MAX_MTU	(PH_MAX_FRSIZE - ETH_HLEN)
+
+struct circ_buf_desc {
+	__le32 sc;
+	__le32 len;
+	__le32 addr;
+} __attribute__((__packed__));
+
+/* Buffer Descriptor Accessors */
+#define CBDW_SC(_cbd, _sc) iowrite32((_sc), &(_cbd)->sc)
+#define CBDW_LEN(_cbd, _len) iowrite32((_len), &(_cbd)->len)
+#define CBDW_ADDR(_cbd, _addr) iowrite32((_addr), &(_cbd)->addr)
+
+#define CBDR_SC(_cbd) ioread32(&(_cbd)->sc)
+#define CBDR_LEN(_cbd) ioread32(&(_cbd)->len)
+#define CBDR_ADDR(_cbd) ioread32(&(_cbd)->addr)
+
+/* Buffer Descriptor Registers */
+#define PCINET_TXBD_BASE	0x400
+#define PCINET_RXBD_BASE	0x800
+
+/* Buffer Descriptor Status */
+#define BD_MEM_READY		0x1
+#define BD_MEM_DIRTY		0x2
+#define BD_MEM_FREE		0x3
+
+/* IMMR Accessor Helpers */
+#define IMMR_R32(_off) ioread32(priv->immr+(_off))
+#define IMMR_W32(_off, _val) iowrite32((_val), priv->immr+(_off))
+#define IMMR_R32BE(_off) ioread32be(priv->immr+(_off))
+#define IMMR_W32BE(_off, _val) iowrite32be((_val), priv->immr+(_off))
+
+/* Status Register Bits */
+#define PCINET_UART_RX_ENABLED		(1<<0)
+#define PCINET_NET_STATUS_RUNNING	(1<<1)
+#define PCINET_NET_RXINT_OFF		(1<<2)
+#define PCINET_NET_REGISTERS_VALID	(1<<3)
+
+/* Driver State Bits */
+#define NET_STATE_STOPPED	0
+#define NET_STATE_RUNNING	1
+
+/* Doorbell Registers */
+#define UART_RX_READY_DBELL	(1<<0)
+#define UART_TX_EMPTY_DBELL	(1<<1)
+#define NET_RX_PACKET_DBELL	(1<<2)
+#define NET_TX_COMPLETE_DBELL	(1<<3)
+#define NET_START_REQ_DBELL	(1<<4)
+#define NET_START_ACK_DBELL	(1<<5)
+#define NET_STOP_REQ_DBELL	(1<<6)
+#define NET_STOP_ACK_DBELL	(1<<7)
+
+#endif /* PCINET_H */
diff --git a/drivers/net/pcinet_fsl.c b/drivers/net/pcinet_fsl.c
new file mode 100644
index 0000000..a6262fe
--- /dev/null
+++ b/drivers/net/pcinet_fsl.c
@@ -0,0 +1,1354 @@
+/*
+ * PCINet and PCISerial Driver for Freescale MPC8349EMDS
+ *
+ * Copyright (c) 2008 Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
+ *
+ * Heavily inspired by the drivers/net/fs_enet driver
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/etherdevice.h>
+#include <linux/mutex.h>
+#include <linux/dmaengine.h>
+
+/* MPC8349EMDS specific get_immrbase() */
+#include <sysdev/fsl_soc.h>
+
+#include "pcinet.h"
+#include "pcinet_hw.h"
+
+static const char driver_name[] = "wqt";
+
+static void wqtuart_rx_char(struct uart_port *port, const char ch);
+static void wqtuart_stop_tx(struct uart_port *port);
+
+struct wqt_dev;
+typedef void (*wqt_irqhandler_t)(struct wqt_dev *);
+
+struct wqt_irqhandlers {
+	wqt_irqhandler_t net_start_req_handler;
+	wqt_irqhandler_t net_start_ack_handler;
+	wqt_irqhandler_t net_stop_req_handler;
+	wqt_irqhandler_t net_stop_ack_handler;
+	wqt_irqhandler_t net_rx_packet_handler;
+	wqt_irqhandler_t net_tx_complete_handler;
+	wqt_irqhandler_t uart_rx_ready_handler;
+	wqt_irqhandler_t uart_tx_empty_handler;
+};
+
+struct wqt_dev {
+	/*--------------------------------------------------------------------*/
+	/* OpenFirmware Infrastructure                                        */
+	/*--------------------------------------------------------------------*/
+	struct of_device *op;
+	struct device *dev;
+	int irq;
+	void __iomem *immr;
+
+	struct mutex irq_mutex;
+	int interrupt_count;
+
+	spinlock_t irq_lock;
+	struct wqt_irqhandlers handlers;
+
+	/*--------------------------------------------------------------------*/
+	/* UART Device Infrastructure                                         */
+	/*--------------------------------------------------------------------*/
+	struct uart_port port;
+	bool uart_rx_enabled;
+	bool uart_open;
+
+	struct workqueue_struct *wq;
+	struct work_struct uart_tx_work;
+	wait_queue_head_t uart_tx_wait; /* sleep for uart_tx_ready */
+	bool uart_tx_ready; /* transmitter state */
+
+	/*--------------------------------------------------------------------*/
+	/* Ethernet Device Infrastructure                                     */
+	/*--------------------------------------------------------------------*/
+	struct net_device *ndev;
+	void __iomem *netregs;
+	dma_addr_t netregs_addr;
+
+	/* Outstanding SKB */
+	struct sk_buff *tx_skbs[PH_RING_SIZE];
+
+	/* Circular Buffer Descriptor base */
+	struct circ_buf_desc __iomem *rx_base;
+	struct circ_buf_desc __iomem *tx_base;
+
+	/* Current SKB index */
+	struct circ_buf_desc __iomem *cur_rx;
+	struct circ_buf_desc __iomem *cur_tx;
+	struct circ_buf_desc __iomem *dirty_tx;
+	int tx_free;
+
+	struct tasklet_struct tx_complete_tasklet;
+	spinlock_t net_lock;
+
+	struct mutex net_mutex;
+	int net_state;
+	struct work_struct net_start_work;
+	struct work_struct net_stop_work;
+	struct completion net_start_completion;
+	struct completion net_stop_completion;
+	struct napi_struct napi;
+
+	struct dma_client client;
+	struct dma_chan *chan;
+};
+
+/*----------------------------------------------------------------------------*/
+/* Status Register Helper Operations                                          */
+/*----------------------------------------------------------------------------*/
+
+static DEFINE_SPINLOCK(status_lock);
+
+static void wqtstatus_setbit(struct wqt_dev *priv, u32 bit)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&status_lock, flags);
+	IMMR_W32(OMR1_OFFSET, IMMR_R32(OMR1_OFFSET) | bit);
+	spin_unlock_irqrestore(&status_lock, flags);
+}
+
+static void wqtstatus_clrbit(struct wqt_dev *priv, u32 bit)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&status_lock, flags);
+	IMMR_W32(OMR1_OFFSET, IMMR_R32(OMR1_OFFSET) & ~bit);
+	spin_unlock_irqrestore(&status_lock, flags);
+}
+
+static int wqtstatus_remote_testbit(struct wqt_dev *priv, u32 bit)
+{
+	return IMMR_R32(IMR1_OFFSET) & bit;
+}
+
+/*----------------------------------------------------------------------------*/
+/* Message Sending and Processing Operations                                  */
+/*----------------------------------------------------------------------------*/
+
+static irqreturn_t wqt_interrupt(int irq, void *dev_id)
+{
+	struct wqt_dev *priv = dev_id;
+	u32 imisr, idr;
+	unsigned long flags;
+
+	imisr = IMMR_R32(IMISR_OFFSET);
+	idr = IMMR_R32(IDR_OFFSET);
+
+	if (!(imisr & 0x8))
+		return IRQ_NONE;
+
+	/* Clear all of the interrupt sources, we'll handle them next */
+	IMMR_W32(IDR_OFFSET, idr);
+
+	/* Lock over all of the handlers, so they cannot get called when
+	 * the code doesn't expect them to be called */
+	spin_lock_irqsave(&priv->irq_lock, flags);
+
+	if (idr & UART_RX_READY_DBELL)
+		priv->handlers.uart_rx_ready_handler(priv);
+
+	if (idr & UART_TX_EMPTY_DBELL)
+		priv->handlers.uart_tx_empty_handler(priv);
+
+	if (idr & NET_RX_PACKET_DBELL)
+		priv->handlers.net_rx_packet_handler(priv);
+
+	if (idr & NET_TX_COMPLETE_DBELL)
+		priv->handlers.net_tx_complete_handler(priv);
+
+	if (idr & NET_START_REQ_DBELL)
+		priv->handlers.net_start_req_handler(priv);
+
+	if (idr & NET_START_ACK_DBELL)
+		priv->handlers.net_start_ack_handler(priv);
+
+	if (idr & NET_STOP_REQ_DBELL)
+		priv->handlers.net_stop_req_handler(priv);
+
+	if (idr & NET_STOP_ACK_DBELL)
+		priv->handlers.net_stop_ack_handler(priv);
+
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+/* Send a character through the mbox when it becomes available
+ * Blocking, must not be called with any spinlocks held */
+static int do_send_message(struct wqt_dev *priv, const char ch)
+{
+	struct uart_port *port = &priv->port;
+	bool tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	while (priv->uart_tx_ready != true) {
+		spin_unlock_irqrestore(&priv->irq_lock, flags);
+		wait_event_timeout(priv->uart_tx_wait, priv->uart_tx_ready, HZ);
+
+		spin_lock_irqsave(&port->lock, flags);
+		tmp = priv->uart_open;
+		spin_unlock_irqrestore(&port->lock, flags);
+
+		if (!tmp)
+			return -EIO;
+
+		spin_lock_irqsave(&priv->irq_lock, flags);
+	}
+
+	/* Now the transmitter is free, send the message */
+	IMMR_W32(OMR0_OFFSET, ch);
+	IMMR_W32(ODR_OFFSET, UART_RX_READY_DBELL);
+
+	/* Mark the transmitter busy */
+	priv->uart_tx_ready = false;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+	return 0;
+}
+
+/* Grab a character out of the uart tx buffer and send it */
+static void uart_tx_work_fn(struct work_struct *work)
+{
+	struct wqt_dev *priv = container_of(work, struct wqt_dev, uart_tx_work);
+	struct uart_port *port = &priv->port;
+	struct circ_buf *xmit = &port->info->xmit;
+	char ch;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+	while (true) {
+
+		/* Check for XON/XOFF (high priority) */
+		if (port->x_char) {
+			ch = port->x_char;
+			port->x_char = 0;
+			spin_unlock_irqrestore(&port->lock, flags);
+
+			if (do_send_message(priv, ch))
+				return;
+
+			spin_lock_irqsave(&port->lock, flags);
+			continue;
+		}
+
+		/* If we're out of chars or the port is stopped, we're done */
+		if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+			wqtuart_stop_tx(port);
+			break;
+		}
+
+		/* Grab the next char out of the buffer and send it */
+		ch = xmit->buf[xmit->tail];
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		spin_unlock_irqrestore(&port->lock, flags);
+
+		if (do_send_message(priv, ch))
+			return;
+
+		spin_lock_irqsave(&port->lock, flags);
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		wqtuart_stop_tx(port);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*----------------------------------------------------------------------------*/
+/* Interrupt Handlers                                                         */
+/*----------------------------------------------------------------------------*/
+
+/* NOTE: All handlers are called with priv->irq_lock held */
+
+static void empty_handler(struct wqt_dev *priv)
+{
+	/* Intentionally left empty */
+}
+
+static void net_start_req_handler(struct wqt_dev *priv)
+{
+	schedule_work(&priv->net_start_work);
+}
+
+static void net_start_ack_handler(struct wqt_dev *priv)
+{
+	complete(&priv->net_start_completion);
+}
+
+static void net_stop_req_handler(struct wqt_dev *priv)
+{
+	schedule_work(&priv->net_stop_work);
+}
+
+static void net_stop_ack_handler(struct wqt_dev *priv)
+{
+	complete(&priv->net_stop_completion);
+}
+
+static void net_tx_complete_handler(struct wqt_dev *priv)
+{
+	tasklet_schedule(&priv->tx_complete_tasklet);
+}
+
+static void net_rx_packet_handler(struct wqt_dev *priv)
+{
+	wqtstatus_setbit(priv, PCINET_NET_RXINT_OFF);
+	netif_rx_schedule(priv->ndev, &priv->napi);
+}
+
+static void uart_rx_ready_handler(struct wqt_dev *priv)
+{
+	wqtuart_rx_char(&priv->port, IMMR_R32(IMR0_OFFSET) & 0xff);
+	IMMR_W32(ODR_OFFSET, UART_TX_EMPTY_DBELL);
+}
+
+static void uart_tx_empty_handler(struct wqt_dev *priv)
+{
+	priv->uart_tx_ready = true;
+	wake_up(&priv->uart_tx_wait);
+}
+
+/*----------------------------------------------------------------------------*/
+/* Interrupt Request / Free Helpers                                           */
+/*----------------------------------------------------------------------------*/
+
+static void do_enable_net_startstop_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_start_req_handler = net_start_req_handler;
+	priv->handlers.net_start_ack_handler = net_start_ack_handler;
+	priv->handlers.net_stop_req_handler = net_stop_req_handler;
+	priv->handlers.net_stop_ack_handler = net_stop_ack_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+
+	wqtstatus_setbit(priv, PCINET_NET_STATUS_RUNNING);
+}
+
+static void do_disable_net_startstop_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	wqtstatus_clrbit(priv, PCINET_NET_STATUS_RUNNING);
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_start_req_handler = empty_handler;
+	priv->handlers.net_start_ack_handler = empty_handler;
+	priv->handlers.net_stop_req_handler = empty_handler;
+	priv->handlers.net_stop_ack_handler = empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_enable_net_rxtx_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_rx_packet_handler = net_rx_packet_handler;
+	priv->handlers.net_tx_complete_handler = net_tx_complete_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_disable_net_rxtx_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_rx_packet_handler = empty_handler;
+	priv->handlers.net_tx_complete_handler = empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_enable_uart_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.uart_rx_ready_handler = uart_rx_ready_handler;
+	priv->handlers.uart_tx_empty_handler = uart_tx_empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_disable_uart_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.uart_rx_ready_handler = empty_handler;
+	priv->handlers.uart_tx_empty_handler = empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static int wqt_request_irq(struct wqt_dev *priv)
+{
+	int ret = 0;
+
+	mutex_lock(&priv->irq_mutex);
+
+	if (priv->interrupt_count > 0)
+		goto out_unlock;
+
+	/* Force all handlers to be disabled before attaching the handler */
+	do_disable_net_startstop_handlers(priv);
+	do_disable_net_rxtx_handlers(priv);
+	do_disable_uart_handlers(priv);
+
+	ret = request_irq(priv->irq,
+			  wqt_interrupt,
+			  IRQF_SHARED,
+			  priv->ndev->name,
+			  priv);
+
+out_unlock:
+	priv->interrupt_count++;
+	mutex_unlock(&priv->irq_mutex);
+
+	return ret;
+}
+
+static void wqt_free_irq(struct wqt_dev *priv)
+{
+	mutex_lock(&priv->irq_mutex);
+	priv->interrupt_count--;
+
+	if (priv->interrupt_count > 0)
+		goto out_unlock;
+
+	free_irq(priv->irq, priv);
+
+out_unlock:
+	mutex_unlock(&priv->irq_mutex);
+}
+
+/*----------------------------------------------------------------------------*/
+/* Network Startup and Shutdown Helpers                                       */
+/*----------------------------------------------------------------------------*/
+
+/* NOTE: All helper functions prefixed with "do" must be called only from
+ * process context, with priv->net_mutex held. They are expected to sleep */
+
+static void do_net_start_queues(struct wqt_dev *priv)
+{
+	if (priv->net_state == NET_STATE_RUNNING)
+		return;
+
+	dev_dbg(priv->dev, "resetting buffer positions\n");
+	priv->cur_rx = priv->rx_base;
+	priv->cur_tx = priv->tx_base;
+	priv->dirty_tx = priv->tx_base;
+	priv->tx_free = PH_RING_SIZE;
+
+	dev_dbg(priv->dev, "enabling NAPI queue\n");
+	napi_enable(&priv->napi);
+
+	dev_dbg(priv->dev, "enabling tx_complete() tasklet\n");
+	tasklet_enable(&priv->tx_complete_tasklet);
+
+	dev_dbg(priv->dev, "enabling TX queue\n");
+	netif_start_queue(priv->ndev);
+
+	dev_dbg(priv->dev, "carrier on!\n");
+	netif_carrier_on(priv->ndev);
+
+	/* Enable the RX_PACKET and TX_COMPLETE interrupt handlers */
+	do_enable_net_rxtx_handlers(priv);
+
+	priv->net_state = NET_STATE_RUNNING;
+}
+
+static void do_net_stop_queues(struct wqt_dev *priv)
+{
+	if (priv->net_state == NET_STATE_STOPPED)
+		return;
+
+	/* Disable the RX_PACKET and TX_COMPLETE interrupt handlers */
+	do_disable_net_rxtx_handlers(priv);
+
+	dev_dbg(priv->dev, "disabling NAPI queue\n");
+	napi_disable(&priv->napi);
+
+	dev_dbg(priv->dev, "disabling tx_complete() tasklet\n");
+	tasklet_disable(&priv->tx_complete_tasklet);
+
+	dev_dbg(priv->dev, "disabling TX queue\n");
+	netif_tx_disable(priv->ndev);
+
+	dev_dbg(priv->dev, "carrier off!\n");
+	netif_carrier_off(priv->ndev);
+
+	priv->net_state = NET_STATE_STOPPED;
+}
+
+/* Called when we get a request to start our queues and acknowledge */
+static void wqtnet_start_work_fn(struct work_struct *work)
+{
+	struct wqt_dev *priv = container_of(work, struct wqt_dev,
+					    net_start_work);
+
+	mutex_lock(&priv->net_mutex);
+
+	do_net_start_queues(priv);
+	IMMR_W32(ODR_OFFSET, NET_START_ACK_DBELL);
+
+	mutex_unlock(&priv->net_mutex);
+}
+
+/* Called when we get a request to stop our queues and acknowledge */
+static void wqtnet_stop_work_fn(struct work_struct *work)
+{
+	struct wqt_dev *priv = container_of(work, struct wqt_dev,
+					    net_stop_work);
+
+	mutex_lock(&priv->net_mutex);
+
+	do_net_stop_queues(priv);
+	IMMR_W32(ODR_OFFSET, NET_STOP_ACK_DBELL);
+
+	mutex_unlock(&priv->net_mutex);
+}
+
+/*----------------------------------------------------------------------------*/
+/* DMA Operation Helpers                                                      */
+/*----------------------------------------------------------------------------*/
+
+/* Setup a static 1GB window starting at PCI address 0x0
+ *
+ * This means that all DMA must be within the first 1GB of the other side's
+ * memory, which shouldn't be a problem
+ */
+static int wqtdma_setup_outbound_window(struct wqt_dev *priv)
+{
+	IMMR_W32BE(LAWAR0_OFFSET, LAWAR0_ENABLE | 0x1d);
+	IMMR_W32BE(POCMR0_OFFSET, POCMR0_ENABLE | 0xc0000);
+	IMMR_W32BE(POTAR0_OFFSET, 0x0);
+
+	return 0;
+}
+
+static enum dma_state_client dmatest_event(struct dma_client *client,
+					   struct dma_chan *chan,
+					   enum dma_state state)
+{
+	struct wqt_dev *priv = container_of(client, struct wqt_dev, client);
+	enum dma_state_client ack = DMA_NAK;
+
+	switch (state) {
+	case DMA_RESOURCE_AVAILABLE:
+		if (chan == priv->chan)
+			ack = DMA_DUP;
+		else if (priv->chan)
+			ack = DMA_NAK;
+		else {
+			priv->chan = chan;
+			ack = DMA_ACK;
+		}
+
+		break;
+
+	case DMA_RESOURCE_REMOVED:
+		priv->chan = NULL;
+		ack = DMA_ACK;
+		break;
+
+	default:
+		dev_dbg(priv->dev, "unhandled DMA event %u (%s)\n",
+				state, chan->dev.bus_id);
+		break;
+	}
+
+	return ack;
+}
+
+static dma_cookie_t dma_async_memcpy_raw_to_buf(struct dma_chan *chan,
+						void *dest,
+						dma_addr_t src,
+						size_t len)
+{
+	struct dma_device *dev = chan->device;
+	struct dma_async_tx_descriptor *tx;
+	dma_addr_t dma_dest, dma_src;
+	dma_cookie_t cookie;
+	int cpu;
+
+	dma_src = src;
+	dma_dest = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE);
+	tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
+					 DMA_CTRL_ACK);
+
+	if (!tx) {
+		dma_unmap_single(dev->dev, dma_dest, len, DMA_FROM_DEVICE);
+		return -ENOMEM;
+	}
+
+	tx->callback = NULL;
+	cookie = tx->tx_submit(tx);
+
+	cpu = get_cpu();
+	per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+	per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+	put_cpu();
+
+	return cookie;
+}
+
+static dma_cookie_t dma_async_memcpy_buf_to_raw(struct dma_chan *chan,
+						dma_addr_t dest,
+						void *src,
+						size_t len)
+{
+	struct dma_device *dev = chan->device;
+	struct dma_async_tx_descriptor *tx;
+	dma_addr_t dma_dest, dma_src;
+	dma_cookie_t cookie;
+	int cpu;
+
+	dma_src = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE);
+	dma_dest = dest;
+	tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
+					 DMA_CTRL_ACK);
+
+	if (!tx) {
+		dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
+		return -ENOMEM;
+	}
+
+	tx->callback = NULL;
+	cookie = tx->tx_submit(tx);
+
+	cpu = get_cpu();
+	per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+	per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+	put_cpu();
+
+	return cookie;
+}
+
+/*----------------------------------------------------------------------------*/
+/* Network Device Operations                                                  */
+/*----------------------------------------------------------------------------*/
+
+static int wqt_open(struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+	int ret;
+
+	/* Pretend the cable is unplugged until we are up and running */
+	netif_carrier_off(dev);
+
+	mutex_lock(&priv->net_mutex);
+
+	ret = wqt_request_irq(priv);
+
+	if (ret)
+		goto out_unlock;
+
+	/* Enable only the network start/stop interrupts */
+	do_enable_net_startstop_handlers(priv);
+
+	/* Check if the other side is running, if not, it will start us.
+	 * Without the interrupt handler installed, there's no way it can
+	 * respond to us anyway */
+	if (!wqtstatus_remote_testbit(priv, PCINET_NET_STATUS_RUNNING)) {
+		ret = 0;
+		goto out_unlock;
+	}
+
+	IMMR_W32(ODR_OFFSET, NET_START_REQ_DBELL);
+	ret = wait_for_completion_timeout(&priv->net_start_completion, 5*HZ);
+
+	if (!ret) {
+		/* Our start request timed out, therefore, the other
+		 * side will start us when it comes back up */
+		dev_dbg(priv->dev, "start timed out\n");
+	} else {
+		do_net_start_queues(priv);
+		ret = 0;
+	}
+
+out_unlock:
+	mutex_unlock(&priv->net_mutex);
+	return ret;
+}
+
+static int wqt_stop(struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+	int ret;
+
+	mutex_lock(&priv->net_mutex);
+
+	do_net_stop_queues(priv);
+
+	IMMR_W32(ODR_OFFSET, NET_STOP_REQ_DBELL);
+	ret = wait_for_completion_timeout(&priv->net_stop_completion, 5*HZ);
+
+	if (!ret)
+		dev_warn(priv->dev, "other side did not stop on time!\n");
+	else
+		ret = 0;
+
+	do_disable_net_startstop_handlers(priv);
+	wqt_free_irq(priv);
+
+	mutex_unlock(&priv->net_mutex);
+	return 0;
+}
+
+static int wqt_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < 68) || (new_mtu > PH_MAX_MTU))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static int wqt_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+	dma_cookie_t cookie;
+	enum dma_status status;
+	struct circ_buf_desc __iomem *bdp;
+	int dirty_idx;
+
+	spin_lock_bh(&priv->net_lock);
+
+	bdp = priv->cur_tx;
+	dirty_idx = bdp - priv->tx_base;
+
+	/* This should not happen, the queue should be stopped */
+	if (priv->tx_free == 0 || CBDR_SC(bdp) != BD_MEM_READY) {
+		netif_stop_queue(dev);
+		spin_unlock_bh(&priv->net_lock);
+		return NETDEV_TX_BUSY;
+	}
+
+	cookie = dma_async_memcpy_buf_to_raw(priv->chan,
+					     (dma_addr_t)(0x80000000 + CBDR_ADDR(bdp)),
+					     skb->data,
+					     skb->len);
+
+	if (dma_submit_error(cookie)) {
+		dev_warn(priv->dev, "DMA submit error\n");
+		spin_unlock_bh(&priv->net_lock);
+		return -ENOMEM;
+	}
+
+	status = dma_sync_wait(priv->chan, cookie);
+
+	if (status == DMA_ERROR) {
+		dev_warn(priv->dev, "DMA error\n");
+		spin_unlock_bh(&priv->net_lock);
+		return -EIO;
+	}
+
+	CBDW_LEN(bdp, skb->len);
+	CBDW_SC(bdp, BD_MEM_DIRTY);
+
+	if (dirty_idx == PH_RING_SIZE - 1)
+		bdp = priv->tx_base;
+	else
+		bdp++;
+
+	priv->tx_skbs[dirty_idx] = skb;
+	priv->cur_tx = bdp;
+	priv->tx_free--;
+	dev->trans_start = jiffies;
+
+	if (priv->tx_free == 0)
+		netif_stop_queue(dev);
+
+	if (!wqtstatus_remote_testbit(priv, PCINET_NET_RXINT_OFF))
+		IMMR_W32(ODR_OFFSET, NET_RX_PACKET_DBELL);
+
+	spin_unlock_bh(&priv->net_lock);
+	return NETDEV_TX_OK;
+}
+
+static void wqt_tx_timeout(struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+
+	dev->stats.tx_errors++;
+	IMMR_W32(ODR_OFFSET, NET_RX_PACKET_DBELL);
+}
+
+static void wqt_tx_complete(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct wqt_dev *priv = netdev_priv(dev);
+	struct sk_buff *skb;
+	struct circ_buf_desc __iomem *bdp;
+	int do_wake, dirty_idx;
+
+	spin_lock_bh(&priv->net_lock);
+
+	bdp = priv->dirty_tx;
+	do_wake = 0;
+
+	while (CBDR_SC(bdp) == BD_MEM_FREE) {
+		dirty_idx = bdp - priv->tx_base;
+
+		skb = priv->tx_skbs[dirty_idx];
+
+		BUG_ON(skb == NULL);
+
+		dev->stats.tx_bytes += skb->len;
+		dev->stats.tx_packets++;
+
+		dev_kfree_skb_irq(skb);
+
+		priv->tx_skbs[dirty_idx] = NULL;
+
+		/* Mark the BDP as ready */
+		CBDW_SC(bdp, BD_MEM_READY);
+
+		/* Update the bdp */
+		if (dirty_idx == PH_RING_SIZE - 1)
+			bdp = priv->tx_base;
+		else
+			bdp++;
+
+		if (!priv->tx_free++)
+			do_wake = 1;
+	}
+
+	priv->dirty_tx = bdp;
+
+	spin_unlock_bh(&priv->net_lock);
+
+	if (do_wake)
+		netif_wake_queue(dev);
+}
+
+static int wqt_rx_napi(struct napi_struct *napi, int budget)
+{
+	struct wqt_dev *priv = container_of(napi, struct wqt_dev, napi);
+	struct net_device *dev = priv->ndev;
+	int received = 0;
+	struct sk_buff *skb;
+	dma_addr_t remote_addr;
+	dma_cookie_t cookie;
+	enum dma_status status;
+	int pkt_len, dirty_idx;
+	struct circ_buf_desc __iomem *bdp;
+
+	bdp = priv->cur_rx;
+
+	while (CBDR_SC(bdp) == BD_MEM_DIRTY) {
+		dirty_idx = bdp - priv->rx_base;
+
+		pkt_len = CBDR_LEN(bdp);
+		remote_addr = CBDR_ADDR(bdp);
+
+		/* Allocate a packet for the data */
+		skb = dev_alloc_skb(pkt_len + NET_IP_ALIGN);
+
+		if (skb == NULL) {
+			dev->stats.rx_dropped++;
+			goto out_err;
+		}
+
+		skb_reserve(skb, NET_IP_ALIGN);
+
+		cookie = dma_async_memcpy_raw_to_buf(priv->chan,
+						     skb->data,
+						     (dma_addr_t)(0x80000000 + remote_addr),
+						     pkt_len);
+
+		if (dma_submit_error(cookie)) {
+			dev_warn(priv->dev, "DMA submit error\n");
+			dev_kfree_skb_irq(skb);
+			dev->stats.rx_dropped++;
+			goto out_err;
+		}
+
+		status = dma_sync_wait(priv->chan, cookie);
+
+		if (status == DMA_ERROR) {
+			dev_warn(priv->dev, "DMA error\n");
+			dev_kfree_skb_irq(skb);
+			dev->stats.rx_dropped++;
+			goto out_err;
+		}
+
+		/* Push the packet into the network stack */
+		skb_put(skb, pkt_len);
+		skb->protocol = eth_type_trans(skb, dev);
+#ifdef CONFIG_PCINET_DISABLE_CHECKSUM
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+#else
+		skb->ip_summed = CHECKSUM_NONE;
+#endif
+		netif_receive_skb(skb);
+		received++;
+		dev->stats.rx_bytes += pkt_len;
+		dev->stats.rx_packets++;
+
+out_err:
+		CBDW_SC(bdp, BD_MEM_FREE);
+
+		if (dirty_idx == PH_RING_SIZE - 1)
+			bdp = priv->rx_base;
+		else
+			bdp++;
+
+		if (received >= budget)
+			break;
+	}
+
+	priv->cur_rx = bdp;
+
+	/* We have processed all packets that the adapter had, but it
+	 * was less than our budget, stop polling */
+	if (received < budget) {
+		netif_rx_complete(dev, napi);
+		wqtstatus_clrbit(priv, PCINET_NET_RXINT_OFF);
+	}
+
+	IMMR_W32(ODR_OFFSET, NET_TX_COMPLETE_DBELL);
+
+	return received;
+}
+
+/*----------------------------------------------------------------------------*/
+/* UART Device Operations                                                     */
+/*----------------------------------------------------------------------------*/
+
+static unsigned int wqtuart_tx_empty(struct uart_port *port)
+{
+	return TIOCSER_TEMT;
+}
+
+static void wqtuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static unsigned int wqtuart_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+static void wqtuart_stop_tx(struct uart_port *port)
+{
+}
+
+static void wqtuart_start_tx(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+
+	queue_work(priv->wq, &priv->uart_tx_work);
+}
+
+static void wqtuart_stop_rx(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+
+	do_disable_uart_handlers(priv);
+	priv->uart_rx_enabled = false;
+	wqtstatus_clrbit(priv, PCINET_UART_RX_ENABLED);
+}
+
+static void wqtuart_enable_ms(struct uart_port *port)
+{
+}
+
+static void wqtuart_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static int wqtuart_startup(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+	int ret;
+
+	ret = wqt_request_irq(priv);
+
+	if (ret)
+		return ret;
+
+	do_enable_uart_handlers(priv);
+
+	/* Mark the transmitter and receiver ready */
+	priv->uart_tx_ready = true;
+	priv->uart_rx_enabled = true;
+	wqtstatus_setbit(priv, PCINET_UART_RX_ENABLED);
+
+	/* Let the other side know that we are ready to receive chars now */
+	IMMR_W32(ODR_OFFSET, UART_TX_EMPTY_DBELL);
+	priv->uart_open = true;
+	return 0;
+}
+
+static void wqtuart_shutdown(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+
+	wqt_free_irq(priv);
+
+	/* Make sure the uart_tx_work_fn() exits cleanly */
+	priv->uart_open = false;
+	wake_up(&priv->uart_tx_wait);
+}
+
+static void wqtuart_set_termios(struct uart_port *port,
+			       struct ktermios *termios,
+			       struct ktermios *old)
+{
+}
+
+static const char *wqtuart_type(struct uart_port *port)
+{
+	return "WQTUART";
+}
+
+static int wqtuart_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static void wqtuart_config_port(struct uart_port *port, int flags)
+{
+}
+
+static void wqtuart_release_port(struct uart_port *port)
+{
+}
+
+static int wqtuart_verify_port(struct uart_port *port,
+			      struct serial_struct *ser)
+{
+	return 0;
+}
+
+static void wqtuart_rx_char(struct uart_port *port, const char ch)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+	struct tty_struct *tty;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (priv->uart_rx_enabled) {
+		tty = port->info->port.tty;
+		tty_insert_flip_char(tty, ch, TTY_NORMAL);
+		tty_flip_buffer_push(tty);
+	}
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static struct uart_ops wqtuart_ops = {
+	.tx_empty	= wqtuart_tx_empty,
+	.set_mctrl	= wqtuart_set_mctrl,
+	.get_mctrl	= wqtuart_get_mctrl,
+	.stop_tx	= wqtuart_stop_tx,
+	.start_tx	= wqtuart_start_tx,
+	.stop_rx	= wqtuart_stop_rx,
+	.enable_ms	= wqtuart_enable_ms,
+	.break_ctl	= wqtuart_break_ctl,
+	.startup	= wqtuart_startup,
+	.shutdown	= wqtuart_shutdown,
+	.set_termios	= wqtuart_set_termios,
+	.type		= wqtuart_type,
+	.release_port	= wqtuart_release_port,
+	.request_port	= wqtuart_request_port,
+	.config_port	= wqtuart_config_port,
+	.verify_port	= wqtuart_verify_port,
+};
+
+static struct uart_driver wqtuart_driver = {
+	.owner		= THIS_MODULE,
+	.driver_name	= driver_name,
+	.dev_name	= "ttyPCI",
+	.major		= 240,
+	.minor		= 0,
+	.nr		= 1,
+};
+
+/*----------------------------------------------------------------------------*/
+/* Network Registers                                                          */
+/*----------------------------------------------------------------------------*/
+
+static void wqt_free_netregs(struct wqt_dev *priv)
+{
+	BUG_ON(priv->netregs == NULL);
+	BUG_ON(priv->netregs_addr == 0x0);
+
+	dma_free_coherent(priv->dev,
+			  PAGE_SIZE,
+			  priv->netregs,
+			  priv->netregs_addr);
+
+	priv->netregs = NULL;
+	priv->netregs_addr = 0x0;
+}
+
+static int wqt_init_netregs(struct wqt_dev *priv)
+{
+	u32 val;
+
+	BUG_ON(priv->netregs != NULL);
+	BUG_ON(priv->netregs_addr != 0x0);
+
+	/* Check the PCI Inbound Window Attributes Register 0 for a 4k window
+	 * This is PCI BAR1, and will be used as network device registers */
+	val = IMMR_R32BE(PIWAR0_OFFSET);
+	val = val & (PIWAR0_ENABLED | PIWAR0_IWS_4K);
+
+	if (val != (PIWAR0_ENABLED | PIWAR0_IWS_4K)) {
+		dev_dbg(priv->dev, "PIWAR0 set up incorrectly\n");
+		return -ENODEV;
+	}
+
+	priv->netregs = dma_alloc_coherent(priv->dev,
+					   PAGE_SIZE,
+					   &priv->netregs_addr,
+					   GFP_KERNEL);
+
+	if (!priv->netregs) {
+		dev_dbg(priv->dev, "Unable to allocate netregs\n");
+		return -ENOMEM;
+	}
+
+	/* Write the page address into the address register */
+	IMMR_W32BE(PITAR0_OFFSET, priv->netregs_addr >> 12);
+	return 0;
+}
+
+/*----------------------------------------------------------------------------*/
+/* OpenFirmware Device Subsystem                                              */
+/*----------------------------------------------------------------------------*/
+
+static int wqt_probe(struct of_device *op, const struct of_device_id *match)
+{
+	struct net_device *ndev;
+	struct wqt_dev *priv;
+	int ret;
+
+	ndev = alloc_etherdev(sizeof(*priv));
+
+	if (!ndev) {
+		ret = -ENOMEM;
+		goto out_alloc_ndev;
+	}
+
+	dev_set_drvdata(&op->dev, ndev);
+	priv = netdev_priv(ndev);
+	priv->op = op;
+	priv->dev = &op->dev;
+	priv->ndev = ndev;
+
+	spin_lock_init(&priv->irq_lock);
+	mutex_init(&priv->irq_mutex);
+
+	/* Hardware Initialization */
+	priv->irq = irq_of_parse_and_map(op->node, 0);
+	priv->immr = ioremap(get_immrbase(), 0x100000);
+
+	if (!priv->immr) {
+		ret = -ENOMEM;
+		goto out_ioremap_immr;
+	}
+
+	ret = wqt_init_netregs(priv);
+
+	if (ret)
+		goto out_init_netregs;
+
+	/* NOTE: Yes, this is correct. Everything was written as if this
+	 * NOTE: side *is* a network card. So the place the card is
+	 * NOTE: receiving from is the other side's TX buffers */
+	priv->rx_base = priv->netregs + PCINET_TXBD_BASE;
+	priv->tx_base = priv->netregs + PCINET_RXBD_BASE;
+	wqtstatus_setbit(priv, PCINET_NET_REGISTERS_VALID);
+
+	/* DMA Client */
+	wqtdma_setup_outbound_window(priv);
+	priv->client.event_callback = dmatest_event;
+	dma_cap_set(DMA_MEMCPY, priv->client.cap_mask);
+	dma_async_client_register(&priv->client);
+	dma_async_client_chan_request(&priv->client);
+
+	/* Initialize private data */
+	priv->wq = create_singlethread_workqueue(driver_name);
+
+	if (!priv->wq) {
+		ret = -ENOMEM;
+		goto out_create_workqueue;
+	}
+
+	INIT_WORK(&priv->uart_tx_work, uart_tx_work_fn);
+	init_waitqueue_head(&priv->uart_tx_wait);
+	priv->uart_tx_ready = true;
+
+	tasklet_init(&priv->tx_complete_tasklet, wqt_tx_complete,
+		     (unsigned long)ndev);
+	tasklet_disable(&priv->tx_complete_tasklet);
+	spin_lock_init(&priv->net_lock);
+
+	mutex_init(&priv->net_mutex);
+	priv->net_state = NET_STATE_STOPPED;
+	INIT_WORK(&priv->net_start_work, wqtnet_start_work_fn);
+	INIT_WORK(&priv->net_stop_work, wqtnet_stop_work_fn);
+	init_completion(&priv->net_start_completion);
+	init_completion(&priv->net_stop_completion);
+
+	/* Mask all of the MBOX interrupts */
+	IMMR_W32(IMIMR_OFFSET, 0x1 | 0x2);
+
+	/* Network Device */
+	random_ether_addr(ndev->dev_addr);
+
+	ndev->open              = wqt_open;
+	ndev->stop              = wqt_stop;
+	ndev->change_mtu        = wqt_change_mtu;
+	ndev->hard_start_xmit   = wqt_hard_start_xmit;
+	ndev->tx_timeout        = wqt_tx_timeout;
+	ndev->watchdog_timeo    = HZ/4;
+	ndev->flags            &= ~IFF_MULTICAST;  /* No multicast support */
+#ifdef CONFIG_PCINET_DISABLE_CHECKSUM
+	ndev->features         |= NETIF_F_NO_CSUM; /* No checksum needed */
+#endif
+	ndev->mtu               = PH_MAX_MTU;
+	netif_napi_add(ndev, &priv->napi, wqt_rx_napi, PH_RING_SIZE);
+
+	ret = register_netdev(ndev);
+
+	if (ret)
+		goto out_register_netdev;
+
+	/* UART Device */
+	priv->port.ops = &wqtuart_ops;
+	priv->port.type = PORT_16550A;
+	priv->port.dev = &op->dev;
+	priv->port.line = 0;
+	spin_lock_init(&priv->port.lock);
+
+	ret = uart_add_one_port(&wqtuart_driver, &priv->port);
+
+	if (ret)
+		goto out_add_uart_port;
+
+	dev_info(priv->dev, "using ethernet device %s\n", ndev->name);
+	dev_info(priv->dev, "using serial device %s%d\n",
+			wqtuart_driver.dev_name, priv->port.line);
+	return 0;
+
+out_add_uart_port:
+	unregister_netdev(ndev);
+out_register_netdev:
+	destroy_workqueue(priv->wq);
+out_create_workqueue:
+	wqt_free_netregs(priv);
+out_init_netregs:
+	iounmap(priv->immr);
+out_ioremap_immr:
+	free_netdev(ndev);
+out_alloc_ndev:
+	return ret;
+}
+
+static int wqt_remove(struct of_device *op)
+{
+	struct net_device *ndev = dev_get_drvdata(&op->dev);
+	struct wqt_dev *priv = netdev_priv(ndev);
+
+	uart_remove_one_port(&wqtuart_driver, &priv->port);
+	unregister_netdev(priv->ndev);
+
+	flush_workqueue(priv->wq);
+	destroy_workqueue(priv->wq);
+
+	wqtstatus_clrbit(priv, PCINET_NET_REGISTERS_VALID);
+	wqt_free_netregs(priv);
+
+	dma_async_client_unregister(&priv->client);
+
+	iounmap(priv->immr);
+
+	free_netdev(ndev);
+
+	return 0;
+}
+
+static struct of_device_id wqt_match[] = {
+	{ .compatible = "fsl,mpc8349-mu", },
+	{},
+};
+
+static struct of_platform_driver wqt_of_driver = {
+	.owner		= THIS_MODULE,
+	.name		= driver_name,
+	.match_table	= wqt_match,
+	.probe		= wqt_probe,
+	.remove		= wqt_remove,
+};
+
+/*----------------------------------------------------------------------------*/
+/* DMA Client Infrastructure                                                  */
+/*----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------*/
+/* Module Init / Exit                                                         */
+/*----------------------------------------------------------------------------*/
+
+static int __init wqt_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&wqtuart_driver);
+
+	if (ret)
+		goto out_uart_register_driver;
+
+	ret = of_register_platform_driver(&wqt_of_driver);
+
+	if (ret)
+		goto out_of_register_platform_driver;
+
+	return 0;
+
+out_of_register_platform_driver:
+	uart_unregister_driver(&wqtuart_driver);
+out_uart_register_driver:
+	return ret;
+}
+
+static void __exit wqt_exit(void)
+{
+	of_unregister_platform_driver(&wqt_of_driver);
+	uart_unregister_driver(&wqtuart_driver);
+}
+
+MODULE_AUTHOR("Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PCINet/PCISerial Driver for MPC8349EMDS");
+MODULE_LICENSE("GPL");
+
+module_init(wqt_init);
+module_exit(wqt_exit);
diff --git a/drivers/net/pcinet_host.c b/drivers/net/pcinet_host.c
new file mode 100644
index 0000000..378ab91
--- /dev/null
+++ b/drivers/net/pcinet_host.c
@@ -0,0 +1,1383 @@
+/*
+ * PCINet and PCISerial Driver for Freescale MPC8349EMDS (Host side)
+ *
+ * Copyright (c) 2008 Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
+ *
+ * Heavily inspired by the drivers/net/fs_enet driver
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/pci.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/etherdevice.h>
+#include <linux/mutex.h>
+
+#include "pcinet.h"
+#include "pcinet_hw.h"
+
+static const char driver_name[] = "wqt";
+
+static void wqtuart_rx_char(struct uart_port *port, const char ch);
+static void wqtuart_stop_tx(struct uart_port *port);
+
+struct wqt_dev;
+typedef void (*wqt_irqhandler_t)(struct wqt_dev *);
+
+struct wqt_irqhandlers {
+	wqt_irqhandler_t net_start_req_handler;
+	wqt_irqhandler_t net_start_ack_handler;
+	wqt_irqhandler_t net_stop_req_handler;
+	wqt_irqhandler_t net_stop_ack_handler;
+	wqt_irqhandler_t net_rx_packet_handler;
+	wqt_irqhandler_t net_tx_complete_handler;
+	wqt_irqhandler_t uart_rx_ready_handler;
+	wqt_irqhandler_t uart_tx_empty_handler;
+};
+
+struct wqt_dev {
+	/*--------------------------------------------------------------------*/
+	/* PCI Infrastructure                                                 */
+	/*--------------------------------------------------------------------*/
+	struct pci_dev *pdev;
+	struct device *dev;
+	void __iomem *immr;
+
+	struct mutex irq_mutex;
+	int interrupt_count;
+
+	spinlock_t irq_lock;
+	struct wqt_irqhandlers handlers;
+
+	/*--------------------------------------------------------------------*/
+	/* UART Device Infrastructure                                         */
+	/*--------------------------------------------------------------------*/
+	struct uart_port port;
+	bool uart_rx_enabled;
+	bool uart_open;
+
+	struct workqueue_struct *wq;
+	struct work_struct uart_tx_work;
+	wait_queue_head_t uart_tx_wait; /* sleep for uart_tx_ready */
+	bool uart_tx_ready; /* transmitter state */
+
+	/*--------------------------------------------------------------------*/
+	/* Ethernet Device Infrastructure                                     */
+	/*--------------------------------------------------------------------*/
+	struct net_device *ndev;
+	void __iomem *netregs;
+
+	/* Outstanding SKB */
+	struct sk_buff *rx_skbs[PH_RING_SIZE];
+	struct sk_buff *tx_skbs[PH_RING_SIZE];
+	dma_addr_t rx_skb_addrs[PH_RING_SIZE];
+	dma_addr_t tx_skb_addrs[PH_RING_SIZE];
+
+	/* Circular Buffer Descriptor base */
+	struct circ_buf_desc __iomem *rx_base;
+	struct circ_buf_desc __iomem *tx_base;
+
+	/* Current SKB index */
+	struct circ_buf_desc __iomem *cur_rx;
+	struct circ_buf_desc __iomem *cur_tx;
+	struct circ_buf_desc __iomem *dirty_tx;
+	int tx_free;
+
+	struct tasklet_struct tx_complete_tasklet;
+	spinlock_t net_lock;
+
+	struct mutex net_mutex;
+	int net_state;
+	struct work_struct net_start_work;
+	struct work_struct net_stop_work;
+	struct completion net_start_completion;
+	struct completion net_stop_completion;
+	struct napi_struct napi;
+};
+
+/*----------------------------------------------------------------------------*/
+/* Status Register Helper Operations                                          */
+/*----------------------------------------------------------------------------*/
+
+static DEFINE_SPINLOCK(status_lock);
+
+static void wqtstatus_setbit(struct wqt_dev *priv, u32 bit)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&status_lock, flags);
+	IMMR_W32(IMR1_OFFSET, IMMR_R32(IMR1_OFFSET) | bit);
+	spin_unlock_irqrestore(&status_lock, flags);
+}
+
+static void wqtstatus_clrbit(struct wqt_dev *priv, u32 bit)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&status_lock, flags);
+	IMMR_W32(IMR1_OFFSET, IMMR_R32(IMR1_OFFSET) & ~bit);
+	spin_unlock_irqrestore(&status_lock, flags);
+}
+
+static int wqtstatus_remote_testbit(struct wqt_dev *priv, u32 bit)
+{
+	return IMMR_R32(OMR1_OFFSET) & bit;
+}
+
+/*----------------------------------------------------------------------------*/
+/* Message Sending and Processing Operations                                  */
+/*----------------------------------------------------------------------------*/
+
+static irqreturn_t wqt_interrupt(int irq, void *dev_id)
+{
+	struct wqt_dev *priv = dev_id;
+	u32 omisr, odr;
+	unsigned long flags;
+
+	omisr = IMMR_R32(OMISR_OFFSET);
+	odr = IMMR_R32(ODR_OFFSET);
+
+	if (!(omisr & 0x8))
+		return IRQ_NONE;
+
+	/* Clear all of the interrupt sources, we'll handle them next */
+	IMMR_W32(ODR_OFFSET, odr);
+
+	/* Lock over all of the handlers, so they cannot get called when
+	 * the code doesn't expect them to be called */
+	spin_lock_irqsave(&priv->irq_lock, flags);
+
+	if (odr & UART_RX_READY_DBELL)
+		priv->handlers.uart_rx_ready_handler(priv);
+
+	if (odr & UART_TX_EMPTY_DBELL)
+		priv->handlers.uart_tx_empty_handler(priv);
+
+	if (odr & NET_RX_PACKET_DBELL)
+		priv->handlers.net_rx_packet_handler(priv);
+
+	if (odr & NET_TX_COMPLETE_DBELL)
+		priv->handlers.net_tx_complete_handler(priv);
+
+	if (odr & NET_START_REQ_DBELL)
+		priv->handlers.net_start_req_handler(priv);
+
+	if (odr & NET_START_ACK_DBELL)
+		priv->handlers.net_start_ack_handler(priv);
+
+	if (odr & NET_STOP_REQ_DBELL)
+		priv->handlers.net_stop_req_handler(priv);
+
+	if (odr & NET_STOP_ACK_DBELL)
+		priv->handlers.net_stop_ack_handler(priv);
+
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+/* Send a character through the mbox when it becomes available
+ * Blocking, must not be called with any spinlocks held */
+static int do_send_message(struct wqt_dev *priv, const char ch)
+{
+	struct uart_port *port = &priv->port;
+	bool tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	while (priv->uart_tx_ready != true) {
+		spin_unlock_irqrestore(&priv->irq_lock, flags);
+		wait_event_timeout(priv->uart_tx_wait, priv->uart_tx_ready, HZ);
+
+		spin_lock_irqsave(&port->lock, flags);
+		tmp = priv->uart_open;
+		spin_unlock_irqrestore(&port->lock, flags);
+
+		if (!tmp)
+			return -EIO;
+
+		spin_lock_irqsave(&priv->irq_lock, flags);
+	}
+
+	/* Now the transmitter is free, send the message */
+	IMMR_W32(IMR0_OFFSET, ch);
+	IMMR_W32(IDR_OFFSET, UART_RX_READY_DBELL);
+
+	/* Mark the transmitter busy */
+	priv->uart_tx_ready = false;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+	return 0;
+}
+
+/* Grab a character out of the uart tx buffer and send it */
+static void uart_tx_work_fn(struct work_struct *work)
+{
+	struct wqt_dev *priv = container_of(work, struct wqt_dev, uart_tx_work);
+	struct uart_port *port = &priv->port;
+	struct circ_buf *xmit = &port->info->xmit;
+	char ch;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+	while (true) {
+
+		/* Check for XON/XOFF (high priority) */
+		if (port->x_char) {
+			ch = port->x_char;
+			port->x_char = 0;
+			spin_unlock_irqrestore(&port->lock, flags);
+
+			if (do_send_message(priv, ch))
+				return;
+
+			spin_lock_irqsave(&port->lock, flags);
+			continue;
+		}
+
+		/* If we're out of chars or the port is stopped, we're done */
+		if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+			wqtuart_stop_tx(port);
+			break;
+		}
+
+		/* Grab the next char out of the buffer and send it */
+		ch = xmit->buf[xmit->tail];
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		spin_unlock_irqrestore(&port->lock, flags);
+
+		if (do_send_message(priv, ch))
+			return;
+
+		spin_lock_irqsave(&port->lock, flags);
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		wqtuart_stop_tx(port);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*----------------------------------------------------------------------------*/
+/* Interrupt Handlers                                                         */
+/*----------------------------------------------------------------------------*/
+
+/* NOTE: All handlers are called with priv->irq_lock held */
+
+static void empty_handler(struct wqt_dev *priv)
+{
+	/* Intentionally left empty */
+}
+
+static void net_start_req_handler(struct wqt_dev *priv)
+{
+	schedule_work(&priv->net_start_work);
+}
+
+static void net_start_ack_handler(struct wqt_dev *priv)
+{
+	complete(&priv->net_start_completion);
+}
+
+static void net_stop_req_handler(struct wqt_dev *priv)
+{
+	schedule_work(&priv->net_stop_work);
+}
+
+static void net_stop_ack_handler(struct wqt_dev *priv)
+{
+	complete(&priv->net_stop_completion);
+}
+
+static void net_tx_complete_handler(struct wqt_dev *priv)
+{
+	tasklet_schedule(&priv->tx_complete_tasklet);
+}
+
+static void net_rx_packet_handler(struct wqt_dev *priv)
+{
+	wqtstatus_setbit(priv, PCINET_NET_RXINT_OFF);
+	netif_rx_schedule(priv->ndev, &priv->napi);
+}
+
+static void uart_rx_ready_handler(struct wqt_dev *priv)
+{
+	wqtuart_rx_char(&priv->port, IMMR_R32(OMR0_OFFSET) & 0xff);
+	IMMR_W32(IDR_OFFSET, UART_TX_EMPTY_DBELL);
+}
+
+static void uart_tx_empty_handler(struct wqt_dev *priv)
+{
+	priv->uart_tx_ready = true;
+	wake_up(&priv->uart_tx_wait);
+}
+
+/*----------------------------------------------------------------------------*/
+/* Interrupt Request / Free Helpers                                           */
+/*----------------------------------------------------------------------------*/
+
+static void do_enable_net_startstop_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_start_req_handler = net_start_req_handler;
+	priv->handlers.net_start_ack_handler = net_start_ack_handler;
+	priv->handlers.net_stop_req_handler = net_stop_req_handler;
+	priv->handlers.net_stop_ack_handler = net_stop_ack_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+
+	wqtstatus_setbit(priv, PCINET_NET_STATUS_RUNNING);
+}
+
+static void do_disable_net_startstop_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	wqtstatus_clrbit(priv, PCINET_NET_STATUS_RUNNING);
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_start_req_handler = empty_handler;
+	priv->handlers.net_start_ack_handler = empty_handler;
+	priv->handlers.net_stop_req_handler = empty_handler;
+	priv->handlers.net_stop_ack_handler = empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_enable_net_rxtx_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_rx_packet_handler = net_rx_packet_handler;
+	priv->handlers.net_tx_complete_handler = net_tx_complete_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_disable_net_rxtx_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.net_rx_packet_handler = empty_handler;
+	priv->handlers.net_tx_complete_handler = empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_enable_uart_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.uart_rx_ready_handler = uart_rx_ready_handler;
+	priv->handlers.uart_tx_empty_handler = uart_tx_empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void do_disable_uart_handlers(struct wqt_dev *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+	priv->handlers.uart_rx_ready_handler = empty_handler;
+	priv->handlers.uart_tx_empty_handler = empty_handler;
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static int wqt_request_irq(struct wqt_dev *priv)
+{
+	int ret = 0;
+
+	mutex_lock(&priv->irq_mutex);
+
+	if (priv->interrupt_count > 0)
+		goto out_unlock;
+
+	/* Force all handlers to be disabled before attaching the handler */
+	do_disable_net_startstop_handlers(priv);
+	do_disable_net_rxtx_handlers(priv);
+	do_disable_uart_handlers(priv);
+
+	ret = request_irq(priv->pdev->irq,
+			  wqt_interrupt,
+			  IRQF_SHARED,
+			  priv->ndev->name,
+			  priv);
+
+out_unlock:
+	priv->interrupt_count++;
+	mutex_unlock(&priv->irq_mutex);
+
+	return ret;
+}
+
+static void wqt_free_irq(struct wqt_dev *priv)
+{
+	mutex_lock(&priv->irq_mutex);
+	priv->interrupt_count--;
+
+	if (priv->interrupt_count > 0)
+		goto out_unlock;
+
+	free_irq(priv->pdev->irq, priv);
+
+out_unlock:
+	mutex_unlock(&priv->irq_mutex);
+}
+
+/*----------------------------------------------------------------------------*/
+/* Network Startup and Shutdown Helpers                                       */
+/*----------------------------------------------------------------------------*/
+
+/* NOTE: All helper functions prefixed with "do" must be called only from
+ * process context, with priv->net_mutex held. They are expected to sleep */
+
+/* NOTE: queues must be stopped before initializing and uninitializing */
+
+static void do_net_initialize_board(struct wqt_dev *priv)
+{
+	int i;
+	struct circ_buf_desc __iomem *bdp;
+
+	BUG_ON(!wqtstatus_remote_testbit(priv, PCINET_NET_REGISTERS_VALID));
+
+	/* Fill in RX ring */
+	for (i = 0, bdp = priv->rx_base; i < PH_RING_SIZE; bdp++, i++) {
+		CBDW_SC(bdp, BD_MEM_READY);
+		CBDW_LEN(bdp, PH_MAX_FRSIZE);
+		CBDW_ADDR(bdp, priv->rx_skb_addrs[i]);
+	}
+
+	/* Fill in TX ring */
+	for (i = 0, bdp = priv->tx_base; i < PH_RING_SIZE; bdp++, i++) {
+		CBDW_SC(bdp, BD_MEM_READY);
+		CBDW_LEN(bdp, 0);
+		CBDW_ADDR(bdp, 0x0);
+	}
+}
+
+static void do_net_uninitialize_board(struct wqt_dev *priv)
+{
+	struct sk_buff *skb;
+	dma_addr_t skb_addr;
+	struct circ_buf_desc __iomem *bdp;
+	int i;
+
+	/* Reset TX ring */
+	for (i = 0, bdp = priv->tx_base; i < PH_RING_SIZE; bdp++, i++) {
+		if (priv->tx_skbs[i]) {
+			skb = priv->tx_skbs[i];
+			skb_addr = priv->tx_skb_addrs[i];
+
+			dma_unmap_single(priv->dev,
+					 skb_addr,
+					 skb->len,
+					 DMA_TO_DEVICE);
+
+			dev_kfree_skb(skb);
+
+			priv->tx_skbs[i] = NULL;
+			priv->tx_skb_addrs[i] = 0x0;
+		}
+
+		CBDW_SC(bdp, BD_MEM_READY);
+		CBDW_LEN(bdp, 0);
+		CBDW_ADDR(bdp, 0x0);
+	}
+}
+
+static void do_net_start_queues(struct wqt_dev *priv)
+{
+	if (priv->net_state == NET_STATE_RUNNING)
+		return;
+
+	dev_dbg(priv->dev, "resetting buffer positions\n");
+	priv->cur_rx = priv->rx_base;
+	priv->cur_tx = priv->tx_base;
+	priv->dirty_tx = priv->tx_base;
+	priv->tx_free = PH_RING_SIZE;
+
+	dev_dbg(priv->dev, "enabling NAPI queue\n");
+	napi_enable(&priv->napi);
+
+	dev_dbg(priv->dev, "enabling tx_complete() tasklet\n");
+	tasklet_enable(&priv->tx_complete_tasklet);
+
+	dev_dbg(priv->dev, "enabling TX queue\n");
+	netif_start_queue(priv->ndev);
+
+	dev_dbg(priv->dev, "carrier on!\n");
+	netif_carrier_on(priv->ndev);
+
+	/* Enable the RX_PACKET and TX_COMPLETE interrupt handlers */
+	do_enable_net_rxtx_handlers(priv);
+
+	priv->net_state = NET_STATE_RUNNING;
+}
+
+static void do_net_stop_queues(struct wqt_dev *priv)
+{
+	if (priv->net_state == NET_STATE_STOPPED)
+		return;
+
+	/* Disable the RX_PACKET and TX_COMPLETE interrupt handlers */
+	do_disable_net_rxtx_handlers(priv);
+
+	dev_dbg(priv->dev, "disabling NAPI queue\n");
+	napi_disable(&priv->napi);
+
+	dev_dbg(priv->dev, "disabling tx_complete() tasklet\n");
+	tasklet_disable(&priv->tx_complete_tasklet);
+
+	dev_dbg(priv->dev, "disabling TX queue\n");
+	netif_tx_disable(priv->ndev);
+
+	dev_dbg(priv->dev, "carrier off!\n");
+	netif_carrier_off(priv->ndev);
+
+	priv->net_state = NET_STATE_STOPPED;
+}
+
+/* Called when we get a request to start our queues and acknowledge */
+static void wqtnet_start_work_fn(struct work_struct *work)
+{
+	struct wqt_dev *priv = container_of(work, struct wqt_dev,
+					    net_start_work);
+
+	mutex_lock(&priv->net_mutex);
+
+	do_net_initialize_board(priv);
+	do_net_start_queues(priv);
+	IMMR_W32(IDR_OFFSET, NET_START_ACK_DBELL);
+
+	mutex_unlock(&priv->net_mutex);
+}
+
+/* Called when we get a request to stop our queues and acknowledge */
+static void wqtnet_stop_work_fn(struct work_struct *work)
+{
+	struct wqt_dev *priv = container_of(work, struct wqt_dev,
+					    net_stop_work);
+
+	mutex_lock(&priv->net_mutex);
+
+	do_net_stop_queues(priv);
+	do_net_uninitialize_board(priv);
+	IMMR_W32(IDR_OFFSET, NET_STOP_ACK_DBELL);
+
+	mutex_unlock(&priv->net_mutex);
+}
+
+/*----------------------------------------------------------------------------*/
+/* SKB Allocation Helpers                                                     */
+/*----------------------------------------------------------------------------*/
+
+static void wqt_cleanup_skbs(struct wqt_dev *priv)
+{
+	struct sk_buff *skb;
+	dma_addr_t skb_addr;
+	int i;
+
+	/* TX ring */
+	for (i = 0; i < PH_RING_SIZE; ++i) {
+		if (priv->tx_skbs[i]) {
+			skb = priv->tx_skbs[i];
+			skb_addr = priv->tx_skb_addrs[i];
+
+			dma_unmap_single(priv->dev,
+					 skb_addr,
+					 skb->len,
+					 DMA_TO_DEVICE);
+
+			dev_kfree_skb(skb);
+
+			priv->tx_skbs[i] = NULL;
+			priv->tx_skb_addrs[i] = 0x0;
+		}
+	}
+
+	/* RX ring */
+	for (i = 0; i < PH_RING_SIZE; ++i) {
+		if (priv->rx_skbs[i]) {
+			skb = priv->rx_skbs[i];
+			skb_addr = priv->rx_skb_addrs[i];
+
+			dma_unmap_single(priv->dev,
+					 skb_addr,
+					 PH_MAX_FRSIZE,
+					 DMA_FROM_DEVICE);
+
+			dev_kfree_skb(skb);
+
+			priv->rx_skbs[i] = NULL;
+			priv->rx_skb_addrs[i] = 0x0;
+		}
+	}
+}
+
+static int wqt_alloc_skbs(struct wqt_dev *priv)
+{
+	struct sk_buff *skb;
+	dma_addr_t skb_addr;
+	int i;
+
+	/* RX ring */
+	for (i = 0; i < PH_RING_SIZE; ++i) {
+		/* Paranoia check */
+		BUG_ON(priv->rx_skbs[i] != NULL);
+		BUG_ON(priv->rx_skb_addrs[i] != 0x0);
+
+		/* Allocate the skb */
+		skb = dev_alloc_skb(PH_MAX_FRSIZE + NET_IP_ALIGN);
+
+		if (skb == NULL)
+			goto out_err;
+
+		skb_reserve(skb, NET_IP_ALIGN);
+
+		/* DMA map the skb */
+		skb_addr = dma_map_single(priv->dev,
+					  skb->data,
+					  PH_MAX_FRSIZE,
+					  DMA_FROM_DEVICE);
+
+		if (dma_mapping_error(skb_addr)) {
+			dev_kfree_skb(skb);
+			goto out_err;
+		}
+
+		priv->rx_skbs[i] = skb;
+		priv->rx_skb_addrs[i] = skb_addr;
+	}
+
+	/* TX ring */
+	for (i = 0; i < PH_RING_SIZE; ++i) {
+		/* Paranoia check */
+		BUG_ON(priv->tx_skbs[i] != NULL);
+		BUG_ON(priv->tx_skb_addrs[i] != 0x0);
+	}
+
+	/* NOTE: the actual initialization of the board happens
+	 * NOTE: in ph_initialize_board(), once the board has
+	 * NOTE: requested to be initialized */
+
+	return 0;
+
+out_err:
+	wqt_cleanup_skbs(priv);
+	return -ENOMEM;
+}
+
+/*----------------------------------------------------------------------------*/
+/* Network Device Operations                                                  */
+/*----------------------------------------------------------------------------*/
+
+static int wqt_open(struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+	int ret;
+
+	/* Check that the other side has registers */
+	if (!wqtstatus_remote_testbit(priv, PCINET_NET_REGISTERS_VALID)) {
+		dev_err(priv->dev, "no driver installed at the other end\n");
+		dev_err(priv->dev, "cowardly refusing to open\n");
+		return -ENOTCONN; /* Transport endpoint is not connected */
+	}
+
+	/* Pretend the cable is unplugged until we are up and running */
+	netif_carrier_off(dev);
+
+	mutex_lock(&priv->net_mutex);
+
+	ret = wqt_alloc_skbs(priv);
+
+	if (ret)
+		goto out_err;
+
+	do_net_initialize_board(priv);
+
+	ret = wqt_request_irq(priv);
+
+	if (ret)
+		goto out_err;
+
+	/* Enable only the network start/stop interrupts */
+	do_enable_net_startstop_handlers(priv);
+
+	/* Check if the other side is running, if not, it will start us.
+	 * Without the interrupt handler installed, there's no way it can
+	 * respond to us anyway */
+	if (!wqtstatus_remote_testbit(priv, PCINET_NET_STATUS_RUNNING))
+		goto out_unlock;
+
+	do_net_initialize_board(priv);
+
+	IMMR_W32(IDR_OFFSET, NET_START_REQ_DBELL);
+	ret = wait_for_completion_timeout(&priv->net_start_completion, 5*HZ);
+
+	if (!ret) {
+		/* Our start request timed out, therefore, the other
+		 * side will start us when it comes back up */
+		dev_dbg(priv->dev, "start timed out\n");
+	} else {
+		do_net_start_queues(priv);
+		ret = 0;
+	}
+
+out_unlock:
+	mutex_unlock(&priv->net_mutex);
+	return 0;
+
+out_err:
+	wqt_cleanup_skbs(priv);
+	mutex_unlock(&priv->net_mutex);
+	return ret;
+}
+
+static int wqt_stop(struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+	int ret;
+
+	mutex_lock(&priv->net_mutex);
+
+	do_net_stop_queues(priv);
+
+	IMMR_W32(IDR_OFFSET, NET_STOP_REQ_DBELL);
+	ret = wait_for_completion_timeout(&priv->net_stop_completion, 5*HZ);
+
+	if (!ret)
+		dev_warn(priv->dev, "other side did not stop on time!\n");
+	else
+		ret = 0;
+
+	do_disable_net_startstop_handlers(priv);
+	wqt_free_irq(priv);
+	do_net_uninitialize_board(priv);
+	wqt_cleanup_skbs(priv);
+
+	mutex_unlock(&priv->net_mutex);
+	return 0;
+}
+
+static int wqt_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < 68) || (new_mtu > PH_MAX_MTU))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static int wqt_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+	dma_addr_t skb_addr;
+	struct circ_buf_desc __iomem *bdp;
+	int dirty_idx;
+
+	spin_lock_bh(&priv->net_lock);
+
+	bdp = priv->cur_tx;
+	dirty_idx = bdp - priv->tx_base;
+
+	/* This should not happen, the queue should be stopped */
+	if (priv->tx_free == 0 || CBDR_SC(bdp) != BD_MEM_READY) {
+		netif_stop_queue(dev);
+		spin_unlock_bh(&priv->net_lock);
+		return NETDEV_TX_BUSY;
+	}
+
+	skb_addr = dma_map_single(priv->dev,
+				  skb->data,
+				  skb->len,
+				  DMA_TO_DEVICE);
+
+	if (dma_mapping_error(skb_addr)) {
+		dev_warn(priv->dev, "DMA mapping error\n");
+		spin_unlock_bh(&priv->net_lock);
+		return -ENOMEM;
+	}
+
+	BUG_ON(priv->tx_skbs[dirty_idx] != NULL);
+	BUG_ON(priv->tx_skb_addrs[dirty_idx] != 0x0);
+
+	priv->tx_skbs[dirty_idx] = skb;
+	priv->tx_skb_addrs[dirty_idx] = skb_addr;
+
+	CBDW_LEN(bdp, skb->len);
+	CBDW_ADDR(bdp, skb_addr);
+	CBDW_SC(bdp, BD_MEM_DIRTY);
+
+	if (dirty_idx == PH_RING_SIZE - 1)
+		bdp = priv->tx_base;
+	else
+		bdp++;
+
+	priv->cur_tx = bdp;
+	priv->tx_free--;
+	dev->trans_start = jiffies;
+
+	if (priv->tx_free == 0)
+		netif_stop_queue(dev);
+
+	if (!wqtstatus_remote_testbit(priv, PCINET_NET_RXINT_OFF))
+		IMMR_W32(IDR_OFFSET, NET_RX_PACKET_DBELL);
+
+	spin_unlock_bh(&priv->net_lock);
+	return NETDEV_TX_OK;
+}
+
+static void wqt_tx_timeout(struct net_device *dev)
+{
+	struct wqt_dev *priv = netdev_priv(dev);
+
+	dev->stats.tx_errors++;
+	IMMR_W32(IDR_OFFSET, NET_RX_PACKET_DBELL);
+}
+
+static void wqt_tx_complete(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct wqt_dev *priv = netdev_priv(dev);
+	struct sk_buff *skb;
+	dma_addr_t skb_addr;
+	struct circ_buf_desc __iomem *bdp;
+	int do_wake, dirty_idx;
+
+	spin_lock_bh(&priv->net_lock);
+
+	bdp = priv->dirty_tx;
+	do_wake = 0;
+
+	while (CBDR_SC(bdp) == BD_MEM_FREE) {
+		dirty_idx = bdp - priv->tx_base;
+
+		skb = priv->tx_skbs[dirty_idx];
+		skb_addr = priv->tx_skb_addrs[dirty_idx];
+
+		BUG_ON(skb == NULL);
+		BUG_ON(skb_addr == 0x0);
+
+		dev->stats.tx_bytes += skb->len;
+		dev->stats.tx_packets++;
+
+		/* Unmap and free the transmitted skb */
+		dma_unmap_single(priv->dev,
+				 skb_addr,
+				 skb->len,
+				 DMA_TO_DEVICE);
+		dev_kfree_skb_irq(skb);
+
+		priv->tx_skbs[dirty_idx] = NULL;
+		priv->tx_skb_addrs[dirty_idx] = 0x0;
+
+		/* Invalidate the buffer descriptor */
+		CBDW_LEN(bdp, 0);
+		CBDW_ADDR(bdp, 0x0);
+		CBDW_SC(bdp, BD_MEM_READY);
+
+		/* Update the bdp */
+		if (dirty_idx == PH_RING_SIZE - 1)
+			bdp = priv->tx_base;
+		else
+			bdp++;
+
+		if (!priv->tx_free++)
+			do_wake = 1;
+	}
+
+	priv->dirty_tx = bdp;
+
+	spin_unlock_bh(&priv->net_lock);
+
+	if (do_wake)
+		netif_wake_queue(dev);
+}
+
+static int wqt_rx_napi(struct napi_struct *napi, int budget)
+{
+	struct wqt_dev *priv = container_of(napi, struct wqt_dev, napi);
+	struct net_device *dev = priv->ndev;
+	int received = 0;
+	struct sk_buff *skb, *skbn;
+	dma_addr_t skb_addr, skbn_addr;
+	int pkt_len, dirty_idx;
+	struct circ_buf_desc __iomem *bdp;
+
+	bdp = priv->cur_rx;
+
+	while (CBDR_SC(bdp) == BD_MEM_DIRTY) {
+		dirty_idx = bdp - priv->rx_base;
+
+		skb = priv->rx_skbs[dirty_idx];
+		skb_addr = priv->rx_skb_addrs[dirty_idx];
+
+		BUG_ON(skb == NULL);
+		BUG_ON(skb_addr == 0x0);
+
+		/* Allocate the next rx skb and DMA map it */
+		skbn = dev_alloc_skb(PH_MAX_FRSIZE + NET_IP_ALIGN);
+
+		if (skbn == NULL) {
+			skbn = skb;
+			skbn_addr = skb_addr;
+			dev->stats.rx_dropped++;
+			goto out_noalloc;
+		}
+
+		skb_reserve(skbn, NET_IP_ALIGN);
+
+		skbn_addr = dma_map_single(priv->dev,
+					   skbn->data,
+					   PH_MAX_FRSIZE,
+					   DMA_FROM_DEVICE);
+
+		if (dma_mapping_error(skbn_addr)) {
+			dev_kfree_skb_irq(skbn);
+			skbn = skb;
+			skbn_addr = skb_addr;
+			dev->stats.rx_dropped++;
+			goto out_noalloc;
+		}
+
+		/* DMA unmap the old skb and pass it up */
+		dma_unmap_single(priv->dev,
+				 skb_addr,
+				 PH_MAX_FRSIZE,
+				 DMA_FROM_DEVICE);
+
+		pkt_len = CBDR_LEN(bdp);
+		skb_put(skb, pkt_len);
+		skb->protocol = eth_type_trans(skb, dev);
+#ifdef CONFIG_PCINET_DISABLE_CHECKSUM
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+#else
+		skb->ip_summed = CHECKSUM_NONE;
+#endif
+		netif_receive_skb(skb);
+		received++;
+		dev->stats.rx_bytes += pkt_len;
+		dev->stats.rx_packets++;
+
+out_noalloc:
+		/* Write the new skb into the buffer descriptor */
+		CBDW_LEN(bdp, PH_MAX_FRSIZE);
+		CBDW_ADDR(bdp, skbn_addr);
+		CBDW_SC(bdp, BD_MEM_FREE);
+
+		priv->rx_skbs[dirty_idx] = skbn;
+		priv->rx_skb_addrs[dirty_idx] = skbn_addr;
+
+		/* Update the bdp */
+		if (dirty_idx == PH_RING_SIZE - 1)
+			bdp = priv->rx_base;
+		else
+			bdp++;
+
+		if (received >= budget)
+			break;
+	}
+
+	priv->cur_rx = bdp;
+
+	/* We have processed all packets that the adapter had, but it
+	 * was less than our budget, stop polling */
+	if (received < budget) {
+		netif_rx_complete(dev, napi);
+		wqtstatus_clrbit(priv, PCINET_NET_RXINT_OFF);
+	}
+
+	IMMR_W32(IDR_OFFSET, NET_TX_COMPLETE_DBELL);
+
+	return received;
+}
+
+/*----------------------------------------------------------------------------*/
+/* UART Device Operations                                                     */
+/*----------------------------------------------------------------------------*/
+
+static unsigned int wqtuart_tx_empty(struct uart_port *port)
+{
+	return TIOCSER_TEMT;
+}
+
+static void wqtuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static unsigned int wqtuart_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+static void wqtuart_stop_tx(struct uart_port *port)
+{
+}
+
+static void wqtuart_start_tx(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+
+	queue_work(priv->wq, &priv->uart_tx_work);
+}
+
+static void wqtuart_stop_rx(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+
+	do_disable_uart_handlers(priv);
+	priv->uart_rx_enabled = false;
+	wqtstatus_clrbit(priv, PCINET_UART_RX_ENABLED);
+}
+
+static void wqtuart_enable_ms(struct uart_port *port)
+{
+}
+
+static void wqtuart_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static int wqtuart_startup(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+	int ret;
+
+	ret = wqt_request_irq(priv);
+
+	if (ret)
+		return ret;
+
+	do_enable_uart_handlers(priv);
+
+	/* Mark the transmitter and receiver ready */
+	priv->uart_tx_ready = true;
+	priv->uart_rx_enabled = true;
+	wqtstatus_setbit(priv, PCINET_UART_RX_ENABLED);
+
+	/* Let the other side know that we are ready to receive chars now */
+	IMMR_W32(IDR_OFFSET, UART_TX_EMPTY_DBELL);
+	priv->uart_open = true;
+	return 0;
+}
+
+static void wqtuart_shutdown(struct uart_port *port)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+
+	wqt_free_irq(priv);
+
+	/* Make sure the uart_tx_work_fn() exits cleanly */
+	priv->uart_open = false;
+	wake_up(&priv->uart_tx_wait);
+}
+
+static void wqtuart_set_termios(struct uart_port *port,
+			       struct ktermios *termios,
+			       struct ktermios *old)
+{
+}
+
+static const char *wqtuart_type(struct uart_port *port)
+{
+	return "WQTUART";
+}
+
+static int wqtuart_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static void wqtuart_config_port(struct uart_port *port, int flags)
+{
+}
+
+static void wqtuart_release_port(struct uart_port *port)
+{
+}
+
+static int wqtuart_verify_port(struct uart_port *port,
+			      struct serial_struct *ser)
+{
+	return 0;
+}
+
+static void wqtuart_rx_char(struct uart_port *port, const char ch)
+{
+	struct wqt_dev *priv = container_of(port, struct wqt_dev, port);
+	struct tty_struct *tty;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (priv->uart_rx_enabled) {
+		tty = port->info->port.tty;
+		tty_insert_flip_char(tty, ch, TTY_NORMAL);
+		tty_flip_buffer_push(tty);
+	}
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static struct uart_ops wqtuart_ops = {
+	.tx_empty	= wqtuart_tx_empty,
+	.set_mctrl	= wqtuart_set_mctrl,
+	.get_mctrl	= wqtuart_get_mctrl,
+	.stop_tx	= wqtuart_stop_tx,
+	.start_tx	= wqtuart_start_tx,
+	.stop_rx	= wqtuart_stop_rx,
+	.enable_ms	= wqtuart_enable_ms,
+	.break_ctl	= wqtuart_break_ctl,
+	.startup	= wqtuart_startup,
+	.shutdown	= wqtuart_shutdown,
+	.set_termios	= wqtuart_set_termios,
+	.type		= wqtuart_type,
+	.release_port	= wqtuart_release_port,
+	.request_port	= wqtuart_request_port,
+	.config_port	= wqtuart_config_port,
+	.verify_port	= wqtuart_verify_port,
+};
+
+static struct uart_driver wqtuart_driver = {
+	.owner		= THIS_MODULE,
+	.driver_name	= driver_name,
+	.dev_name	= "ttyPCI",
+	.major		= 240,
+	.minor		= 0,
+	.nr		= 1,
+};
+
+/*----------------------------------------------------------------------------*/
+/* PCI Subsystem                                                              */
+/*----------------------------------------------------------------------------*/
+
+static int wqt_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	struct net_device *ndev;
+	struct wqt_dev *priv;
+	int ret;
+
+	ndev = alloc_etherdev(sizeof(*priv));
+
+	if (!ndev) {
+		ret = -ENOMEM;
+		goto out_alloc_ndev;
+	}
+
+	pci_set_drvdata(dev, ndev);
+	priv = netdev_priv(ndev);
+	priv->pdev = dev;
+	priv->dev = &dev->dev;
+	priv->ndev = ndev;
+
+	mutex_init(&priv->irq_mutex);
+	spin_lock_init(&priv->irq_lock);
+
+	/* Hardware Initialization */
+	ret = pci_enable_device(dev);
+
+	if (ret)
+		goto out_pci_enable_dev;
+
+	pci_set_master(dev);
+
+	ret = pci_request_regions(dev, driver_name);
+
+	if (ret)
+		goto out_pci_request_regions;
+
+	priv->immr = pci_iomap(dev, 0, 0);
+
+	if (!priv->immr) {
+		ret = -ENOMEM;
+		goto out_iomap_immr;
+	}
+
+	priv->netregs = pci_iomap(dev, 1, 0);
+
+	if (!priv->netregs) {
+		ret = -ENOMEM;
+		goto out_iomap_netregs;
+	}
+
+	priv->rx_base = priv->netregs + PCINET_RXBD_BASE;
+	priv->tx_base = priv->netregs + PCINET_TXBD_BASE;
+
+	ret = dma_set_mask(&dev->dev, 0xcfffffff);
+
+	if (ret) {
+		dev_err(&dev->dev, "Unable to set DMA mask\n");
+		ret = -ENODEV;
+		goto out_set_dma_mask;
+	}
+
+	/* Initialize private data */
+	priv->wq = create_singlethread_workqueue(driver_name);
+
+	if (!priv->wq) {
+		ret = -ENOMEM;
+		goto out_create_workqueue;
+	}
+
+	INIT_WORK(&priv->uart_tx_work, uart_tx_work_fn);
+	init_waitqueue_head(&priv->uart_tx_wait);
+	priv->uart_tx_ready = true;
+
+	tasklet_init(&priv->tx_complete_tasklet, wqt_tx_complete,
+		     (unsigned long)ndev);
+	tasklet_disable(&priv->tx_complete_tasklet);
+	spin_lock_init(&priv->net_lock);
+
+	mutex_init(&priv->net_mutex);
+	priv->net_state = NET_STATE_STOPPED;
+	INIT_WORK(&priv->net_start_work, wqtnet_start_work_fn);
+	INIT_WORK(&priv->net_stop_work, wqtnet_stop_work_fn);
+	init_completion(&priv->net_start_completion);
+	init_completion(&priv->net_stop_completion);
+
+	/* Mask all of the MBOX interrupts */
+	IMMR_W32(OMIMR_OFFSET, 0x1 | 0x2);
+
+	/* Network Device */
+	random_ether_addr(ndev->dev_addr);
+
+	ndev->open              = wqt_open;
+	ndev->stop              = wqt_stop;
+	ndev->change_mtu        = wqt_change_mtu;
+	ndev->hard_start_xmit   = wqt_hard_start_xmit;
+	ndev->tx_timeout        = wqt_tx_timeout;
+	ndev->watchdog_timeo    = HZ/4;
+	ndev->flags            &= ~IFF_MULTICAST;  /* No multicast support */
+#ifdef CONFIG_PCINET_DISABLE_CHECKSUM
+	ndev->features         |= NETIF_F_NO_CSUM; /* No checksum needed */
+#endif
+	ndev->mtu               = PH_MAX_MTU;
+	netif_napi_add(ndev, &priv->napi, wqt_rx_napi, PH_RING_SIZE);
+
+	ret = register_netdev(ndev);
+
+	if (ret)
+		goto out_register_netdev;
+
+	/* UART Device */
+	priv->port.ops = &wqtuart_ops;
+	priv->port.type = PORT_16550A;
+	priv->port.dev = &dev->dev;
+	priv->port.line = 0;
+	spin_lock_init(&priv->port.lock);
+
+	ret = uart_add_one_port(&wqtuart_driver, &priv->port);
+
+	if (ret)
+		goto out_add_uart_port;
+
+	dev_info(priv->dev, "using ethernet device %s\n", ndev->name);
+	dev_info(priv->dev, "using serial device %s%d\n",
+			wqtuart_driver.dev_name, priv->port.line);
+	return 0;
+
+out_add_uart_port:
+	unregister_netdev(ndev);
+out_register_netdev:
+	destroy_workqueue(priv->wq);
+out_create_workqueue:
+out_set_dma_mask:
+	pci_iounmap(dev, priv->netregs);
+out_iomap_netregs:
+	pci_iounmap(dev, priv->immr);
+out_iomap_immr:
+	pci_release_regions(dev);
+out_pci_request_regions:
+	pci_disable_device(dev);
+out_pci_enable_dev:
+	free_netdev(ndev);
+out_alloc_ndev:
+	return ret;
+}
+
+static void wqt_remove(struct pci_dev *dev)
+{
+	struct net_device *ndev = pci_get_drvdata(dev);
+	struct wqt_dev *priv = netdev_priv(ndev);
+
+	uart_remove_one_port(&wqtuart_driver, &priv->port);
+	unregister_netdev(priv->ndev);
+
+	flush_workqueue(priv->wq);
+	destroy_workqueue(priv->wq);
+
+	pci_iounmap(dev, priv->netregs);
+	pci_iounmap(dev, priv->immr);
+	pci_release_regions(dev);
+	pci_disable_device(dev);
+
+	free_netdev(ndev);
+}
+
+#define PCI_DEVID_FSL_MPC8349EMDS 0x0080
+
+/* The list of devices that this module will support */
+static struct pci_device_id wqt_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, PCI_DEVID_FSL_MPC8349EMDS), },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, wqt_ids);
+
+static struct pci_driver wqt_pci_driver = {
+	.name     = (char *)driver_name,
+	.id_table = wqt_ids,
+	.probe    = wqt_probe,
+	.remove   = wqt_remove,
+};
+
+/*----------------------------------------------------------------------------*/
+/* Module Init / Exit                                                         */
+/*----------------------------------------------------------------------------*/
+
+static int __init wqt_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&wqtuart_driver);
+
+	if (ret)
+		goto out_uart_register_driver;
+
+	ret = pci_register_driver(&wqt_pci_driver);
+
+	if (ret)
+		goto out_pci_register_driver;
+
+	return 0;
+
+out_pci_register_driver:
+	uart_unregister_driver(&wqtuart_driver);
+out_uart_register_driver:
+	return ret;
+}
+
+static void __exit wqt_exit(void)
+{
+	pci_unregister_driver(&wqt_pci_driver);
+	uart_unregister_driver(&wqtuart_driver);
+}
+
+MODULE_AUTHOR("Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PCINet/PCISerial Driver for MPC8349EMDS (Host side)");
+MODULE_LICENSE("GPL");
+
+module_init(wqt_init);
+module_exit(wqt_exit);
diff --git a/drivers/net/pcinet_hw.h b/drivers/net/pcinet_hw.h
new file mode 100644
index 0000000..499ba61
--- /dev/null
+++ b/drivers/net/pcinet_hw.h
@@ -0,0 +1,77 @@
+/*
+ * Register offsets for the MPC8349EMDS Message Unit from the IMMR base address
+ *
+ * Copyright (c) 2008 Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef PCINET_HW_H
+#define PCINET_HW_H
+
+/* mpc8349emds message unit register offsets */
+#define OMISR_OFFSET		0x8030
+#define OMIMR_OFFSET		0x8034
+#define IMR0_OFFSET		0x8050
+#define IMR1_OFFSET		0x8054
+#define OMR0_OFFSET		0x8058
+#define OMR1_OFFSET		0x805C
+#define ODR_OFFSET		0x8060
+#define IDR_OFFSET		0x8068
+#define IMISR_OFFSET		0x8080
+#define IMIMR_OFFSET		0x8084
+
+
+/* mpc8349emds pci and local access window register offsets */
+#define LAWAR0_OFFSET		0x0064
+#define LAWAR0_ENABLE		(1<<31)
+
+#define POCMR0_OFFSET		0x8410
+#define POCMR0_ENABLE		(1<<31)
+
+#define POTAR0_OFFSET		0x8400
+
+#define LAWAR1_OFFSET		0x006c
+#define LAWAR1_ENABLE		(1<<31)
+
+#define POCMR1_OFFSET		0x8428
+#define POCMR1_ENABLE		(1<<31)
+
+#define POTAR1_OFFSET		0x8418
+
+
+/* mpc8349emds dma controller register offsets */
+#define DMAMR0_OFFSET		0x8100
+#define DMASR0_OFFSET		0x8104
+#define DMASAR0_OFFSET		0x8110
+#define DMADAR0_OFFSET		0x8118
+#define DMABCR0_OFFSET		0x8120
+
+#define DMA_CHANNEL_BUSY	(1<<2)
+
+#define DMA_DIRECT_MODE_SNOOP	(1<<20)
+#define DMA_CHANNEL_MODE_DIRECT	(1<<2)
+#define DMA_CHANNEL_START	(1<<0)
+
+
+/* mpc8349emds pci and local access window register offsets */
+#define LAWAR0_OFFSET		0x0064
+#define LAWAR0_ENABLE		(1<<31)
+
+#define POCMR0_OFFSET		0x8410
+#define POCMR0_ENABLE		(1<<31)
+
+#define POTAR0_OFFSET		0x8400
+
+
+/* mpc8349emds pci and inbound window register offsets */
+#define PITAR0_OFFSET		0x8568
+#define PIWAR0_OFFSET		0x8578
+
+#define PIWAR0_ENABLED		(1<<31)
+#define PIWAR0_PREFETCH		(1<<29)
+#define PIWAR0_IWS_4K		0xb
+
+#endif /* PCINET_HW_H */
-- 
1.5.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/