[dm96xx] Add driver for Davicom DM96xx USB Ethernet NICs

Signed-off-by: Michael Brown <mcb30@ipxe.org>

4 files changed, 865 insertions, 1 deletions

diff --git a/src/drivers/net/dm96xx.c b/src/drivers/net/dm96xx.c
new file mode 100644
index 000000000..71d008fab
--- /dev/null
+++ b/src/drivers/net/dm96xx.c
@@ -0,0 +1,667 @@
+/*
+ * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ipxe/ethernet.h>
+#include <ipxe/usb.h>
+#include <ipxe/usbnet.h>
+#include "dm96xx.h"
+
+/** @file
+ *
+ * Davicom DM96xx USB Ethernet driver
+ *
+ */
+
+/******************************************************************************
+ *
+ * Register operations
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Reset device
+ *
+ * @v dm96xx		DM96xx device
+ * @ret rc		Return status code
+ */
+static int dm96xx_reset ( struct dm96xx_device *dm96xx ) {
+	int ncr;
+	int rc;
+
+	/* Reset device */
+	if ( ( rc = dm96xx_write_register ( dm96xx, DM96XX_NCR,
+					    DM96XX_NCR_RST ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not reset: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	/* Wait for reset to complete */
+	udelay ( DM96XX_RESET_DELAY_US );
+
+	/* Check that reset has completed */
+	ncr = dm96xx_read_register ( dm96xx, DM96XX_NCR );
+	if ( ncr < 0 ) {
+		rc = ncr;
+		DBGC ( dm96xx, "DM96XX %p failed to reset: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+	if ( ncr & DM96XX_NCR_RST ) {
+		DBGC ( dm96xx, "DM96XX %p failed to reset (NCR=%#02x)\n",
+		       dm96xx, ncr );
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * Read MAC address
+ *
+ * @v dm96xx		DM96xx device
+ * @v mac		MAC address to fill in
+ * @ret rc		Return status code
+ */
+static int dm96xx_read_mac ( struct dm96xx_device *dm96xx, uint8_t *mac ) {
+	int rc;
+
+	/* Read MAC address */
+	if ( ( rc = dm96xx_read_registers ( dm96xx, DM96XX_PAR, mac,
+					    ETH_ALEN ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not read MAC address: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/**
+ * Write MAC address
+ *
+ * @v dm96xx		DM96xx device
+ * @v mac		MAC address
+ * @ret rc		Return status code
+ */
+static int dm96xx_write_mac ( struct dm96xx_device *dm96xx, uint8_t *mac ) {
+	int rc;
+
+	/* Write MAC address */
+	if ( ( rc = dm96xx_write_registers ( dm96xx, DM96XX_PAR, mac,
+					     ETH_ALEN ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not write MAC address: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/**
+ * Update link status based on network status register
+ *
+ * @v dm96xx		DM96xx device
+ * @v nsr		Network status register
+ */
+static void dm96xx_link_nsr ( struct dm96xx_device *dm96xx, unsigned int nsr ) {
+	struct net_device *netdev = dm96xx->netdev;
+
+	if ( nsr & DM96XX_NSR_LINKST ) {
+		if ( ! netdev_link_ok ( netdev ) )
+			netdev_link_up ( netdev );
+	} else {
+		if ( netdev_link_ok ( netdev ) )
+			netdev_link_down ( netdev );
+	}
+}
+
+/**
+ * Get link status
+ *
+ * @v dm96xx		DM96xx device
+ * @ret rc		Return status code
+ */
+static int dm96xx_check_link ( struct dm96xx_device *dm96xx ) {
+	int nsr;
+	int rc;
+
+	/* Read network status register */
+	nsr = dm96xx_read_register ( dm96xx, DM96XX_NSR );
+	if ( nsr < 0 ) {
+		rc = nsr;
+		DBGC ( dm96xx, "DM96XX %p could not read network status: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	/* Update link status */
+	dm96xx_link_nsr ( dm96xx, nsr );
+
+	return 0;
+}
+
+/**
+ * Set DM9601-compatible RX header mode
+ *
+ * @v dm96xx		DM96xx device
+ * @ret rc		Return status code
+ */
+static int dm96xx_rx_mode ( struct dm96xx_device *dm96xx ) {
+	int chipr;
+	int mode_ctl;
+	int rc;
+
+	/* Get chip revision */
+	chipr = dm96xx_read_register ( dm96xx, DM96XX_CHIPR );
+	if ( chipr < 0 ) {
+		rc = chipr;
+		DBGC ( dm96xx, "DM96XX %p could not read chip revision: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	/* Do nothing if device is a DM9601 anyway */
+	if ( chipr == DM96XX_CHIPR_9601 )
+		return 0;
+
+	/* Read current mode control */
+	mode_ctl = dm96xx_read_register ( dm96xx, DM96XX_MODE_CTL );
+	if ( mode_ctl < 0 ) {
+		rc = mode_ctl;
+		DBGC ( dm96xx, "DM96XX %p could not read mode control: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	/* Write mode control */
+	mode_ctl &= ~DM96XX_MODE_CTL_MODE;
+	if ( ( rc = dm96xx_write_register ( dm96xx, DM96XX_MODE_CTL,
+					    mode_ctl ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not write mode control: %s\n",
+		       dm96xx, strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ * Endpoint operations
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Complete interrupt transfer
+ *
+ * @v ep		USB endpoint
+ * @v iobuf		I/O buffer
+ * @v rc		Completion status code
+ */
+static void dm96xx_intr_complete ( struct usb_endpoint *ep,
+				   struct io_buffer *iobuf, int rc ) {
+	struct dm96xx_device *dm96xx = container_of ( ep, struct dm96xx_device,
+						      usbnet.intr );
+	struct net_device *netdev = dm96xx->netdev;
+	struct dm96xx_interrupt *intr;
+	size_t len = iob_len ( iobuf );
+
+	/* Ignore packets cancelled when the endpoint closes */
+	if ( ! ep->open )
+		goto done;
+
+	/* Record USB errors against the network device */
+	if ( rc != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p interrupt failed: %s\n",
+		       dm96xx, strerror ( rc ) );
+		DBGC_HDA ( dm96xx, 0, iobuf->data, iob_len ( iobuf ) );
+		netdev_rx_err ( netdev, NULL, rc );
+		goto done;
+	}
+
+	/* Extract message header */
+	if ( len < sizeof ( *intr ) ) {
+		DBGC ( dm96xx, "DM96XX %p underlength interrupt:\n", dm96xx );
+		DBGC_HDA ( dm96xx, 0, iobuf->data, iob_len ( iobuf ) );
+		netdev_rx_err ( netdev, NULL, -EINVAL );
+		goto done;
+	}
+	intr = iobuf->data;
+
+	/* Update link status */
+	dm96xx_link_nsr ( dm96xx, intr->nsr );
+
+ done:
+	/* Free I/O buffer */
+	free_iob ( iobuf );
+}
+
+/** Interrupt endpoint operations */
+static struct usb_endpoint_driver_operations dm96xx_intr_operations = {
+	.complete = dm96xx_intr_complete,
+};
+
+/**
+ * Complete bulk IN transfer
+ *
+ * @v ep		USB endpoint
+ * @v iobuf		I/O buffer
+ * @v rc		Completion status code
+ */
+static void dm96xx_in_complete ( struct usb_endpoint *ep,
+				 struct io_buffer *iobuf, int rc ) {
+	struct dm96xx_device *dm96xx = container_of ( ep, struct dm96xx_device,
+						      usbnet.in );
+	struct net_device *netdev = dm96xx->netdev;
+	struct dm96xx_rx_header *header;
+
+	/* Ignore packets cancelled when the endpoint closes */
+	if ( ! ep->open ) {
+		free_iob ( iobuf );
+		return;
+	}
+
+	/* Record USB errors against the network device */
+	if ( rc != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p bulk IN failed: %s\n",
+		       dm96xx, strerror ( rc ) );
+		goto err;
+	}
+
+	/* Sanity check */
+	if ( iob_len ( iobuf ) < ( sizeof ( *header ) + 4 /* CRC */ ) ) {
+		DBGC ( dm96xx, "DM96XX %p underlength bulk IN\n", dm96xx );
+		DBGC_HDA ( dm96xx, 0, iobuf->data, iob_len ( iobuf ) );
+		rc = -EINVAL;
+		goto err;
+	}
+
+	/* Strip header and CRC */
+	header = iobuf->data;
+	iob_pull ( iobuf, sizeof ( *header ) );
+	iob_unput ( iobuf, 4 /* CRC */ );
+
+	/* Check status */
+	if ( header->rsr & ~DM96XX_RSR_MF ) {
+		DBGC ( dm96xx, "DM96XX %p receive error %02x:\n",
+		       dm96xx, header->rsr );
+		DBGC_HDA ( dm96xx, 0, iobuf->data, iob_len ( iobuf ) );
+		rc = -EIO;
+		goto err;
+	}
+
+	/* Hand off to network stack */
+	netdev_rx ( netdev, iob_disown ( iobuf ) );
+	return;
+
+ err:
+	/* Hand off to network stack */
+	netdev_rx_err ( netdev, iob_disown ( iobuf ), rc );
+}
+
+/** Bulk IN endpoint operations */
+static struct usb_endpoint_driver_operations dm96xx_in_operations = {
+	.complete = dm96xx_in_complete,
+};
+
+/**
+ * Transmit packet
+ *
+ * @v dm96xx		DM96xx device
+ * @v iobuf		I/O buffer
+ * @ret rc		Return status code
+ */
+static int dm96xx_out_transmit ( struct dm96xx_device *dm96xx,
+				 struct io_buffer *iobuf ) {
+	struct dm96xx_tx_header *header;
+	size_t len = iob_len ( iobuf );
+	int rc;
+
+	/* Prepend header */
+	if ( ( rc = iob_ensure_headroom ( iobuf, sizeof ( *header ) ) ) != 0 )
+		return rc;
+	header = iob_push ( iobuf, sizeof ( *header ) );
+	header->len = cpu_to_le16 ( len );
+
+	/* Enqueue I/O buffer */
+	if ( ( rc = usb_stream ( &dm96xx->usbnet.out, iobuf, 0 ) ) != 0 )
+		return rc;
+
+	return 0;
+}
+
+/**
+ * Complete bulk OUT transfer
+ *
+ * @v ep		USB endpoint
+ * @v iobuf		I/O buffer
+ * @v rc		Completion status code
+ */
+static void dm96xx_out_complete ( struct usb_endpoint *ep,
+				  struct io_buffer *iobuf, int rc ) {
+	struct dm96xx_device *dm96xx = container_of ( ep, struct dm96xx_device,
+						      usbnet.out );
+	struct net_device *netdev = dm96xx->netdev;
+
+	/* Report TX completion */
+	netdev_tx_complete_err ( netdev, iobuf, rc );
+}
+
+/** Bulk OUT endpoint operations */
+static struct usb_endpoint_driver_operations dm96xx_out_operations = {
+	.complete = dm96xx_out_complete,
+};
+
+/******************************************************************************
+ *
+ * Network device interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Open network device
+ *
+ * @v netdev		Network device
+ * @ret rc		Return status code
+ */
+static int dm96xx_open ( struct net_device *netdev ) {
+	struct dm96xx_device *dm96xx = netdev->priv;
+	unsigned int rcr;
+	int rc;
+
+	/* Set DM9601-compatible RX header mode */
+	if ( ( rc = dm96xx_rx_mode ( dm96xx ) ) != 0 )
+		goto err_rx_mode;
+
+	/* Write MAC address */
+	if ( ( rc = dm96xx_write_mac ( dm96xx, netdev->ll_addr ) ) != 0 )
+		goto err_write_mac;
+
+	/* Open USB network device */
+	if ( ( rc = usbnet_open ( &dm96xx->usbnet ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not open: %s\n",
+		       dm96xx, strerror ( rc ) );
+		goto err_open;
+	}
+
+	/* Set receive filters */
+	rcr = ( DM96XX_RCR_ALL | DM96XX_RCR_RUNT | DM96XX_RCR_PRMSC |
+		DM96XX_RCR_RXEN );
+	if ( ( rc = dm96xx_write_register ( dm96xx, DM96XX_RCR, rcr ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not write receive filters: "
+		       "%s\n", dm96xx, strerror ( rc ) );
+		goto err_write_rcr;
+	}
+
+	/* Update link status */
+	if ( ( rc = dm96xx_check_link ( dm96xx ) ) != 0 )
+		goto err_check_link;
+
+	return 0;
+
+ err_check_link:
+ err_write_rcr:
+	usbnet_close ( &dm96xx->usbnet );
+ err_open:
+ err_write_mac:
+ err_rx_mode:
+	return rc;
+}
+
+/**
+ * Close network device
+ *
+ * @v netdev		Network device
+ */
+static void dm96xx_close ( struct net_device *netdev ) {
+	struct dm96xx_device *dm96xx = netdev->priv;
+
+	/* Close USB network device */
+	usbnet_close ( &dm96xx->usbnet );
+
+	/* Reset device */
+	dm96xx_reset ( dm96xx );
+}
+
+/**
+ * Transmit packet
+ *
+ * @v netdev		Network device
+ * @v iobuf		I/O buffer
+ * @ret rc		Return status code
+ */
+static int dm96xx_transmit ( struct net_device *netdev,
+			     struct io_buffer *iobuf ) {
+	struct dm96xx_device *dm96xx = netdev->priv;
+	int rc;
+
+	/* Transmit packet */
+	if ( ( rc = dm96xx_out_transmit ( dm96xx, iobuf ) ) != 0 )
+		return rc;
+
+	return 0;
+}
+
+/**
+ * Poll for completed and received packets
+ *
+ * @v netdev		Network device
+ */
+static void dm96xx_poll ( struct net_device *netdev ) {
+	struct dm96xx_device *dm96xx = netdev->priv;
+	int rc;
+
+	/* Poll USB bus */
+	usb_poll ( dm96xx->bus );
+
+	/* Refill endpoints */
+	if ( ( rc = usbnet_refill ( &dm96xx->usbnet ) ) != 0 )
+		netdev_rx_err ( netdev, NULL, rc );
+}
+
+/** DM96xx network device operations */
+static struct net_device_operations dm96xx_operations = {
+	.open		= dm96xx_open,
+	.close		= dm96xx_close,
+	.transmit	= dm96xx_transmit,
+	.poll		= dm96xx_poll,
+};
+
+/******************************************************************************
+ *
+ * USB interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Probe device
+ *
+ * @v func		USB function
+ * @v config		Configuration descriptor
+ * @ret rc		Return status code
+ */
+static int dm96xx_probe ( struct usb_function *func,
+		       struct usb_configuration_descriptor *config ) {
+	struct usb_device *usb = func->usb;
+	struct net_device *netdev;
+	struct dm96xx_device *dm96xx;
+	int rc;
+
+	/* Allocate and initialise structure */
+	netdev = alloc_etherdev ( sizeof ( *dm96xx ) );
+	if ( ! netdev ) {
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	netdev_init ( netdev, &dm96xx_operations );
+	netdev->dev = &func->dev;
+	dm96xx = netdev->priv;
+	memset ( dm96xx, 0, sizeof ( *dm96xx ) );
+	dm96xx->usb = usb;
+	dm96xx->bus = usb->port->hub->bus;
+	dm96xx->netdev = netdev;
+	usbnet_init ( &dm96xx->usbnet, func, &dm96xx_intr_operations,
+		      &dm96xx_in_operations, &dm96xx_out_operations );
+	usb_refill_init ( &dm96xx->usbnet.intr, 0, DM96XX_INTR_MAX_FILL );
+	usb_refill_init ( &dm96xx->usbnet.in, DM96XX_IN_MTU,
+			  DM96XX_IN_MAX_FILL );
+	DBGC ( dm96xx, "DM96XX %p on %s\n", dm96xx, func->name );
+
+	/* Describe USB network device */
+	if ( ( rc = usbnet_describe ( &dm96xx->usbnet, config ) ) != 0 ) {
+		DBGC ( dm96xx, "DM96XX %p could not describe: %s\n",
+		       dm96xx, strerror ( rc ) );
+		goto err_describe;
+	}
+
+	/* Reset device */
+	if ( ( rc = dm96xx_reset ( dm96xx ) ) != 0 )
+		goto err_reset;
+
+	/* Read MAC address */
+	if ( ( rc = dm96xx_read_mac ( dm96xx, netdev->hw_addr ) ) != 0 )
+		goto err_read_mac;
+
+	/* Get initial link status */
+	if ( ( rc = dm96xx_check_link ( dm96xx ) ) != 0 )
+		goto err_check_link;
+
+	/* Register network device */
+	if ( ( rc = register_netdev ( netdev ) ) != 0 )
+		goto err_register;
+
+	usb_func_set_drvdata ( func, netdev );
+	return 0;
+
+	unregister_netdev ( netdev );
+ err_register:
+ err_check_link:
+ err_read_mac:
+ err_reset:
+ err_describe:
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+ err_alloc:
+	return rc;
+}
+
+/**
+ * Remove device
+ *
+ * @v func		USB function
+ */
+static void dm96xx_remove ( struct usb_function *func ) {
+	struct net_device *netdev = usb_func_get_drvdata ( func );
+
+	unregister_netdev ( netdev );
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+}
+
+/** DM96xx device IDs */
+static struct usb_device_id dm96xx_ids[] = {
+	{
+		.name = "dm9601-corega",
+		.vendor = 0x07aa,
+		.product = 0x9601,
+	},
+	{
+		.name = "dm9601",
+		.vendor = 0x0a46,
+		.product = 0x9601,
+	},
+	{
+		.name = "zt6688",
+		.vendor = 0x0a46,
+		.product = 0x6688,
+	},
+	{
+		.name = "st268",
+		.vendor = 0x0a46,
+		.product = 0x0268,
+	},
+	{
+		.name = "adm8515",
+		.vendor = 0x0a46,
+		.product = 0x8515,
+	},
+	{
+		.name = "dm9601-hirose",
+		.vendor = 0x0a47,
+		.product = 0x9601,
+	},
+	{
+		.name = "dm9601-8101",
+		.vendor = 0x0fe6,
+		.product = 0x8101,
+	},
+	{
+		.name = "dm9601-9700",
+		.vendor = 0x0fe6,
+		.product = 0x9700,
+	},
+	{
+		.name = "dm9000e",
+		.vendor = 0x0a46,
+		.product = 0x9000,
+	},
+	{
+		.name = "dm9620",
+		.vendor = 0x0a46,
+		.product = 0x9620,
+	},
+	{
+		.name = "dm9621A",
+		.vendor = 0x0a46,
+		.product = 0x9621,
+	},
+	{
+		.name = "dm9622",
+		.vendor = 0x0a46,
+		.product = 0x9622,
+	},
+	{
+		.name = "dm962Oa",
+		.vendor = 0x0a46,
+		.product = 0x0269,
+	},
+	{
+		.name = "dm9621a",
+		.vendor = 0x0a46,
+		.product = 0x1269,
+	},
+};
+
+/** Davicom DM96xx driver */
+struct usb_driver dm96xx_driver __usb_driver = {
+	.ids = dm96xx_ids,
+	.id_count = ( sizeof ( dm96xx_ids ) / sizeof ( dm96xx_ids[0] ) ),
+	.probe = dm96xx_probe,
+	.remove = dm96xx_remove,
+};
diff --git a/src/drivers/net/dm96xx.h b/src/drivers/net/dm96xx.h
new file mode 100644
index 000000000..7cd144d2f
--- /dev/null
+++ b/src/drivers/net/dm96xx.h
@@ -0,0 +1,194 @@
+#ifndef _DM96XX_H
+#define _DM96XX_H
+
+/** @file
+ *
+ * Davicom DM96xx USB Ethernet driver
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/usb.h>
+#include <ipxe/usbnet.h>
+#include <ipxe/if_ether.h>
+
+/** Read register(s) */
+#define DM96XX_READ_REGISTER					\
+	( USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE |	\
+	  USB_REQUEST_TYPE ( 0x00 ) )
+
+/** Write register(s) */
+#define DM96XX_WRITE_REGISTER					\
+	( USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE |	\
+	  USB_REQUEST_TYPE ( 0x01 ) )
+
+/** Write single register */
+#define DM96XX_WRITE1_REGISTER					\
+	( USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE |	\
+	  USB_REQUEST_TYPE ( 0x03 ) )
+
+/** Network control register */
+#define DM96XX_NCR 0x00
+#define DM96XX_NCR_RST		0x01	/**< Software reset */
+
+/** Network status register */
+#define DM96XX_NSR 0x01
+#define DM96XX_NSR_LINKST	0x40	/**< Link status */
+
+/** Receive control register */
+#define DM96XX_RCR 0x05
+#define DM96XX_RCR_ALL		0x08	/**< Pass all multicast */
+#define DM96XX_RCR_RUNT		0x04	/**< Pass runt packet */
+#define DM96XX_RCR_PRMSC	0x02	/**< Promiscuous mode */
+#define DM96XX_RCR_RXEN		0x01	/**< RX enable */
+
+/** Receive status register */
+#define DM96XX_RSR 0x06
+#define DM96XX_RSR_MF		0x40	/**< Multicast frame */
+
+/** PHY address registers */
+#define DM96XX_PAR 0x10
+
+/** Chip revision register */
+#define DM96XX_CHIPR 0x2c
+#define DM96XX_CHIPR_9601	0x00	/**< DM9601 */
+#define DM96XX_CHIPR_9620	0x01	/**< DM9620 */
+
+/** RX header control/status register (DM9620+ only) */
+#define DM96XX_MODE_CTL 0x91
+#define DM96XX_MODE_CTL_MODE	0x80	/**< 4-byte header mode */
+
+/** DM96xx interrupt data */
+struct dm96xx_interrupt {
+	/** Network status register */
+	uint8_t nsr;
+	/** Transmit status registers */
+	uint8_t tsr[2];
+	/** Receive status register */
+	uint8_t rsr;
+	/** Receive overflow counter register */
+	uint8_t rocr;
+	/** Receive packet counter */
+	uint8_t rxc;
+	/** Transmit packet counter */
+	uint8_t txc;
+	/** General purpose register */
+	uint8_t gpr;
+} __attribute__ (( packed ));
+
+/** DM96xx receive header */
+struct dm96xx_rx_header {
+	/** Packet status */
+	uint8_t rsr;
+	/** Packet length (excluding this header, including CRC) */
+	uint16_t len;
+} __attribute__ (( packed ));
+
+/** DM96xx transmit header */
+struct dm96xx_tx_header {
+	/** Packet length (excluding this header) */
+	uint16_t len;
+} __attribute__ (( packed ));
+
+/** A DM96xx network device */
+struct dm96xx_device {
+	/** USB device */
+	struct usb_device *usb;
+	/** USB bus */
+	struct usb_bus *bus;
+	/** Network device */
+	struct net_device *netdev;
+	/** USB network device */
+	struct usbnet_device usbnet;
+};
+
+/**
+ * Read registers
+ *
+ * @v dm96xx		DM96xx device
+ * @v offset		Register offset
+ * @v data		Data buffer
+ * @v len		Length of data
+ * @ret rc		Return status code
+ */
+static inline __attribute__ (( always_inline )) int
+dm96xx_read_registers ( struct dm96xx_device *dm96xx, unsigned int offset,
+			void *data, size_t len ) {
+
+	return usb_control ( dm96xx->usb, DM96XX_READ_REGISTER, 0, offset,
+			     data, len );
+}
+
+/**
+ * Read register
+ *
+ * @v dm96xx		DM96xx device
+ * @v offset		Register offset
+ * @ret value		Register value, or negative error
+ */
+static inline __attribute__ (( always_inline )) int
+dm96xx_read_register ( struct dm96xx_device *dm96xx, unsigned int offset ) {
+	uint8_t value;
+	int rc;
+
+	if ( ( rc = dm96xx_read_registers ( dm96xx, offset, &value,
+					    sizeof ( value ) ) ) != 0 )
+		return rc;
+	return value;
+}
+
+/**
+ * Write registers
+ *
+ * @v dm96xx		DM96xx device
+ * @v offset		Register offset
+ * @v data		Data buffer
+ * @v len		Length of data
+ * @ret rc		Return status code
+ */
+static inline __attribute__ (( always_inline )) int
+dm96xx_write_registers ( struct dm96xx_device *dm96xx, unsigned int offset,
+			 void *data, size_t len ) {
+
+	return usb_control ( dm96xx->usb, DM96XX_WRITE_REGISTER, 0, offset,
+			     data, len );
+}
+
+/**
+ * Write register
+ *
+ * @v dm96xx		DM96xx device
+ * @v offset		Register offset
+ * @v value		Register value
+ * @ret rc		Return status code
+ */
+static inline __attribute__ (( always_inline )) int
+dm96xx_write_register ( struct dm96xx_device *dm96xx, unsigned int offset,
+			uint8_t value ) {
+
+	return usb_control ( dm96xx->usb, DM96XX_WRITE1_REGISTER, value,
+			     offset, NULL, 0 );
+}
+
+/** Reset delay (in microseconds) */
+#define DM96XX_RESET_DELAY_US 10
+
+/** Interrupt maximum fill level
+ *
+ * This is a policy decision.
+ */
+#define DM96XX_INTR_MAX_FILL 2
+
+/** Bulk IN maximum fill level
+ *
+ * This is a policy decision.
+ */
+#define DM96XX_IN_MAX_FILL 8
+
+/** Bulk IN buffer size */
+#define DM96XX_IN_MTU					\
+	( 4 /* DM96xx header */ + ETH_FRAME_LEN +	\
+	  4 /* possible VLAN header */ + 4 /* CRC */ )
+
+#endif /* _DM96XX_H */
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index a71a60354..a3b68327f 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -164,7 +164,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #define ERRFILE_ecm		     ( ERRFILE_DRIVER | 0x006c0000 )
 #define ERRFILE_ncm		     ( ERRFILE_DRIVER | 0x006d0000 )
 #define ERRFILE_usbnet		     ( ERRFILE_DRIVER | 0x006e0000 )
-
+#define ERRFILE_dm96xx		     ( ERRFILE_DRIVER | 0x006f0000 )
 #define ERRFILE_scsi		     ( ERRFILE_DRIVER | 0x00700000 )
 #define ERRFILE_arbel		     ( ERRFILE_DRIVER | 0x00710000 )
 #define ERRFILE_hermon		     ( ERRFILE_DRIVER | 0x00720000 )
diff --git a/src/include/ipxe/usb.h b/src/include/ipxe/usb.h
index 5ea9fa4ae..59661f701 100644
--- a/src/include/ipxe/usb.h
+++ b/src/include/ipxe/usb.h
@@ -78,6 +78,9 @@ struct usb_setup_packet {
 /** Class-specific request type */
 #define USB_TYPE_CLASS ( 1 << 5 )
 
+/** Vendor-specific request type */
+#define USB_TYPE_VENDOR ( 2 << 5 )
+
 /** Request recipient is the device */
 #define USB_RECIP_DEVICE ( 0 << 0 )