[skel] Add skeleton network driver

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

2 files changed, 331 insertions, 0 deletions

diff --git a/src/drivers/net/skeleton.c b/src/drivers/net/skeleton.c
new file mode 100644
index 0000000..3e1e2d5
--- /dev/null
+++ b/src/drivers/net/skeleton.c
@@ -0,0 +1,308 @@
+/*
+ * Copyright (C) 2012 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 <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <byteswap.h>
+#include <ipxe/netdevice.h>
+#include <ipxe/ethernet.h>
+#include <ipxe/if_ether.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/malloc.h>
+#include <ipxe/pci.h>
+#include <ipxe/mii.h>
+#include "skeleton.h"
+
+/** @file
+ *
+ * Skeleton network driver
+ *
+ */
+
+/******************************************************************************
+ *
+ * MII interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Read from MII register
+ *
+ * @v mii		MII interface
+ * @v reg		Register address
+ * @ret value		Data read, or negative error
+ */
+static int skeleton_mii_read ( struct mii_interface *mii, unsigned int reg ) {
+	struct skeleton_nic *skel =
+		container_of ( mii, struct skeleton_nic, mii );
+
+	DBGC ( skel, "SKELETON %p does not yet support MII read\n", skel );
+	( void ) reg;
+	return -ENOTSUP;
+}
+
+/**
+ * Write to MII register
+ *
+ * @v mii		MII interface
+ * @v reg		Register address
+ * @v data		Data to write
+ * @ret rc		Return status code
+ */
+static int skeleton_mii_write ( struct mii_interface *mii, unsigned int reg,
+				unsigned int data) {
+	struct skeleton_nic *skel =
+		container_of ( mii, struct skeleton_nic, mii );
+
+	DBGC ( skel, "SKELETON %p does not yet support MII write\n", skel );
+	( void ) reg;
+	( void ) data;
+	return -ENOTSUP;
+}
+
+/** Skeleton MII operations */
+static struct mii_operations skeleton_mii_operations = {
+	.read = skeleton_mii_read,
+	.write = skeleton_mii_write,
+};
+
+/******************************************************************************
+ *
+ * Device reset
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Reset hardware
+ *
+ * @v skel		Skeleton device
+ * @ret rc		Return status code
+ */
+static int skeleton_reset ( struct skeleton_nic *skel ) {
+
+	DBGC ( skel, "SKELETON %p does not yet support reset\n", skel );
+	return -ENOTSUP;
+}
+
+/******************************************************************************
+ *
+ * Link state
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Check link state
+ *
+ * @v netdev		Network device
+ */
+static void skeleton_check_link ( struct net_device *netdev ) {
+	struct skeleton_nic *skel = netdev->priv;
+
+	DBGC ( skel, "SKELETON %p does not yet support link state\n", skel );
+	netdev_link_err ( netdev, -ENOTSUP );
+}
+
+/******************************************************************************
+ *
+ * Network device interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Open network device
+ *
+ * @v netdev		Network device
+ * @ret rc		Return status code
+ */
+static int skeleton_open ( struct net_device *netdev ) {
+	struct skeleton_nic *skel = netdev->priv;
+
+	DBGC ( skel, "SKELETON %p does not yet support open\n", skel );
+	return -ENOTSUP;
+}
+
+/**
+ * Close network device
+ *
+ * @v netdev		Network device
+ */
+static void skeleton_close ( struct net_device *netdev ) {
+	struct skeleton_nic *skel = netdev->priv;
+
+	DBGC ( skel, "SKELETON %p does not yet support close\n", skel );
+}
+
+/**
+ * Transmit packet
+ *
+ * @v netdev		Network device
+ * @v iobuf		I/O buffer
+ * @ret rc		Return status code
+ */
+static int skeleton_transmit ( struct net_device *netdev,
+			       struct io_buffer *iobuf ) {
+	struct skeleton_nic *skel = netdev->priv;
+
+	DBGC ( skel, "SKELETON %p does not yet support transmit\n", skel );
+	( void ) iobuf;
+	return -ENOTSUP;
+}
+
+/**
+ * Poll for completed and received packets
+ *
+ * @v netdev		Network device
+ */
+static void skeleton_poll ( struct net_device *netdev ) {
+	struct skeleton_nic *skel = netdev->priv;
+
+	/* Not yet implemented */
+	( void ) skel;
+}
+
+/**
+ * Enable or disable interrupts
+ *
+ * @v netdev		Network device
+ * @v enable		Interrupts should be enabled
+ */
+static void skeleton_irq ( struct net_device *netdev, int enable ) {
+	struct skeleton_nic *skel = netdev->priv;
+
+	DBGC ( skel, "SKELETON %p does not yet support interrupts\n", skel );
+	( void ) enable;
+}
+
+/** Skeleton network device operations */
+static struct net_device_operations skeleton_operations = {
+	.open		= skeleton_open,
+	.close		= skeleton_close,
+	.transmit	= skeleton_transmit,
+	.poll		= skeleton_poll,
+	.irq		= skeleton_irq,
+};
+
+/******************************************************************************
+ *
+ * PCI interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Probe PCI device
+ *
+ * @v pci		PCI device
+ * @ret rc		Return status code
+ */
+static int skeleton_probe ( struct pci_device *pci ) {
+	struct net_device *netdev;
+	struct skeleton_nic *skel;
+	int rc;
+
+	/* Allocate and initialise net device */
+	netdev = alloc_etherdev ( sizeof ( *skel ) );
+	if ( ! netdev ) {
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	netdev_init ( netdev, &skeleton_operations );
+	skel = netdev->priv;
+	pci_set_drvdata ( pci, netdev );
+	netdev->dev = &pci->dev;
+	memset ( skel, 0, sizeof ( *skel ) );
+
+	/* Fix up PCI device */
+	adjust_pci_device ( pci );
+
+	/* Map registers */
+	skel->regs = ioremap ( pci->membase, SKELETON_BAR_SIZE );
+
+	/* Reset the NIC */
+	if ( ( rc = skeleton_reset ( skel ) ) != 0 )
+		goto err_reset;
+
+	/* Initialise and reset MII interface */
+	mii_init ( &skel->mii, &skeleton_mii_operations );
+	if ( ( rc = mii_reset ( &skel->mii ) ) != 0 ) {
+		DBGC ( skel, "SKELETON %p could not reset MII: %s\n",
+		       skel, strerror ( rc ) );
+		goto err_mii_reset;
+	}
+
+	/* Register network device */
+	if ( ( rc = register_netdev ( netdev ) ) != 0 )
+		goto err_register_netdev;
+
+	/* Set initial link state */
+	skeleton_check_link ( netdev );
+
+	return 0;
+
+	unregister_netdev ( netdev );
+ err_register_netdev:
+ err_mii_reset:
+	skeleton_reset ( skel );
+ err_reset:
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+ err_alloc:
+	return rc;
+}
+
+/**
+ * Remove PCI device
+ *
+ * @v pci		PCI device
+ */
+static void skeleton_remove ( struct pci_device *pci ) {
+	struct net_device *netdev = pci_get_drvdata ( pci );
+	struct skeleton_nic *skel = netdev->priv;
+
+	/* Unregister network device */
+	unregister_netdev ( netdev );
+
+	/* Reset card */
+	skeleton_reset ( skel );
+
+	/* Free network device */
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+}
+
+/** Skeleton PCI device IDs */
+static struct pci_device_id skeleton_nics[] = {
+	PCI_ROM ( 0x5ce1, 0x5ce1, "skel",	"Skeleton", 0 ),
+};
+
+/** Skeleton PCI driver */
+struct pci_driver skeleton_driver __pci_driver = {
+	.ids = skeleton_nics,
+	.id_count = ( sizeof ( skeleton_nics ) / sizeof ( skeleton_nics[0] ) ),
+	.probe = skeleton_probe,
+	.remove = skeleton_remove,
+};
diff --git a/src/drivers/net/skeleton.h b/src/drivers/net/skeleton.h
new file mode 100644
index 0000000..3de2afa
--- /dev/null
+++ b/src/drivers/net/skeleton.h
@@ -0,0 +1,23 @@
+#ifndef _SKELETON_H
+#define _SKELETON_H
+
+/** @file
+ *
+ * Skeleton network driver
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** Skeleton BAR size */
+#define SKELETON_BAR_SIZE 256
+
+/** A skeleton network card */
+struct skeleton_nic {
+	/** Registers */
+	void *regs;
+	/** MII interface */
+	struct mii_interface mii;
+};
+
+#endif /* _SKELETON_H */