[PATCH] net: tulip: remove xircom_cb driver

[PATCH] net: tulip: remove xircom_cb driver

[Pablo Vallespín Aranguren]

A possible bug was found in investigate_read_descriptor() and a fix was
proposed. Since this is an orphan driver for hardware that is old,
removing the driver was suggested instead. This patch removes the driver.

Link: https://lore.kernel.org/netdev/2026080158-next-diligent-b4ce@gregkh
Signed-off-by: Pablo Vallespín Aranguren <pablopva014@gmail.com>
---
 drivers/net/ethernet/dec/tulip/Kconfig     |   12 -
 drivers/net/ethernet/dec/tulip/Makefile    |    1 -
 drivers/net/ethernet/dec/tulip/xircom_cb.c | 1172 --------------------
 3 files changed, 1185 deletions(-)
 delete mode 100644 drivers/net/ethernet/dec/tulip/xircom_cb.c

diff --git a/drivers/net/ethernet/dec/tulip/Kconfig b/drivers/net/ethernet/dec/tulip/Kconfig
index 078a12f07e96..b7ff76ff51e4 100644
--- a/drivers/net/ethernet/dec/tulip/Kconfig
+++ b/drivers/net/ethernet/dec/tulip/Kconfig
@@ -139,16 +139,4 @@ config ULI526X
 	  To compile this driver as a module, choose M here. The module will
 	  be called uli526x.
 	  
-config PCMCIA_XIRCOM
-	tristate "Xircom CardBus support"
-	depends on CARDBUS
-	help
-	  This driver is for the Digital "Tulip" Ethernet CardBus adapters.
-	  It should work with most DEC 21*4*-based chips/ethercards, as well
-	  as with work-alike chips from Lite-On (PNIC) and Macronix (MXIC) and
-	  ASIX.
-
-	  To compile this driver as a module, choose M here. The module will
-	  be called xircom_cb.  If unsure, say N.
-
 endif # NET_TULIP
diff --git a/drivers/net/ethernet/dec/tulip/Makefile b/drivers/net/ethernet/dec/tulip/Makefile
index d4f1d21d29a0..5d999d72840f 100644
--- a/drivers/net/ethernet/dec/tulip/Makefile
+++ b/drivers/net/ethernet/dec/tulip/Makefile
@@ -5,7 +5,6 @@
 
 ccflags-$(CONFIG_NET_TULIP)	:= -DDEBUG
 
-obj-$(CONFIG_PCMCIA_XIRCOM)	+= xircom_cb.o
 obj-$(CONFIG_DM9102)		+= dmfe.o
 obj-$(CONFIG_WINBOND_840)	+= winbond-840.o
 obj-$(CONFIG_DE2104X)		+= de2104x.o
diff --git a/drivers/net/ethernet/dec/tulip/xircom_cb.c b/drivers/net/ethernet/dec/tulip/xircom_cb.c
deleted file mode 100644
index e5d2ede13845..000000000000
--- a/drivers/net/ethernet/dec/tulip/xircom_cb.c
+++ /dev/null
@@ -1,1172 +0,0 @@
-/*
- * xircom_cb: A driver for the (tulip-like) Xircom Cardbus ethernet cards
- *
- * This software is (C) by the respective authors, and licensed under the GPL
- * License.
- *
- * Written by Arjan van de Ven for Red Hat, Inc.
- * Based on work by Jeff Garzik, Doug Ledford and Donald Becker
- *
- *  	This software may be used and distributed according to the terms
- *      of the GNU General Public License, incorporated herein by reference.
- *
- *
- * 	$Id: xircom_cb.c,v 1.33 2001/03/19 14:02:07 arjanv Exp $
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/pci.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/delay.h>
-#include <linux/bitops.h>
-
-#include <linux/uaccess.h>
-#include <asm/io.h>
-#ifdef CONFIG_NET_POLL_CONTROLLER
-#include <asm/irq.h>
-#endif
-
-MODULE_DESCRIPTION("Xircom Cardbus ethernet driver");
-MODULE_AUTHOR("Arjan van de Ven <arjanv@redhat.com>");
-MODULE_LICENSE("GPL");
-
-#define xw32(reg, val)	iowrite32(val, ioaddr + (reg))
-#define xr32(reg)	ioread32(ioaddr + (reg))
-#define xr8(reg)	ioread8(ioaddr + (reg))
-
-/* IO registers on the card, offsets */
-#define CSR0	0x00
-#define CSR1	0x08
-#define CSR2	0x10
-#define CSR3	0x18
-#define CSR4	0x20
-#define CSR5	0x28
-#define CSR6	0x30
-#define CSR7	0x38
-#define CSR8	0x40
-#define CSR9	0x48
-#define CSR10	0x50
-#define CSR11	0x58
-#define CSR12	0x60
-#define CSR13	0x68
-#define CSR14	0x70
-#define CSR15	0x78
-#define CSR16	0x80
-
-/* PCI registers */
-#define PCI_POWERMGMT 	0x40
-
-/* Offsets of the buffers within the descriptor pages, in bytes */
-
-#define NUMDESCRIPTORS 4
-
-static int bufferoffsets[NUMDESCRIPTORS] = {128,2048,4096,6144};
-
-
-struct xircom_private {
-	/* Send and receive buffers, kernel-addressable and dma addressable forms */
-
-	__le32 *rx_buffer;
-	__le32 *tx_buffer;
-
-	dma_addr_t rx_dma_handle;
-	dma_addr_t tx_dma_handle;
-
-	struct sk_buff *tx_skb[4];
-
-	void __iomem *ioaddr;
-	int open;
-
-	/* transmit_used is the rotating counter that indicates which transmit
-	   descriptor has to be used next */
-	int transmit_used;
-
-	/* Spinlock to serialize register operations.
-	   It must be helt while manipulating the following registers:
-	   CSR0, CSR6, CSR7, CSR9, CSR10, CSR15
-	 */
-	spinlock_t lock;
-
-	struct pci_dev *pdev;
-	struct net_device *dev;
-};
-
-
-/* Function prototypes */
-static int xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id);
-static void xircom_remove(struct pci_dev *pdev);
-static irqreturn_t xircom_interrupt(int irq, void *dev_instance);
-static netdev_tx_t xircom_start_xmit(struct sk_buff *skb,
-					   struct net_device *dev);
-static int xircom_open(struct net_device *dev);
-static int xircom_close(struct net_device *dev);
-static void xircom_up(struct xircom_private *card);
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void xircom_poll_controller(struct net_device *dev);
-#endif
-
-static void investigate_read_descriptor(struct net_device *dev,struct xircom_private *card, int descnr, unsigned int bufferoffset);
-static void investigate_write_descriptor(struct net_device *dev, struct xircom_private *card, int descnr, unsigned int bufferoffset);
-static void read_mac_address(struct xircom_private *card);
-static void transceiver_voodoo(struct xircom_private *card);
-static void initialize_card(struct xircom_private *card);
-static void trigger_transmit(struct xircom_private *card);
-static void trigger_receive(struct xircom_private *card);
-static void setup_descriptors(struct xircom_private *card);
-static void remove_descriptors(struct xircom_private *card);
-static int link_status_changed(struct xircom_private *card);
-static void activate_receiver(struct xircom_private *card);
-static void deactivate_receiver(struct xircom_private *card);
-static void activate_transmitter(struct xircom_private *card);
-static void deactivate_transmitter(struct xircom_private *card);
-static void enable_transmit_interrupt(struct xircom_private *card);
-static void enable_receive_interrupt(struct xircom_private *card);
-static void enable_link_interrupt(struct xircom_private *card);
-static void disable_all_interrupts(struct xircom_private *card);
-static int link_status(struct xircom_private *card);
-
-
-
-static const struct pci_device_id xircom_pci_table[] = {
-	{ PCI_VDEVICE(XIRCOM, 0x0003), },
-	{0,},
-};
-MODULE_DEVICE_TABLE(pci, xircom_pci_table);
-
-static struct pci_driver xircom_driver = {
-	.name		= "xircom_cb",
-	.id_table	= xircom_pci_table,
-	.probe		= xircom_probe,
-	.remove		= xircom_remove,
-};
-
-
-#if defined DEBUG && DEBUG > 1
-static void print_binary(unsigned int number)
-{
-	int i,i2;
-	char buffer[64];
-	memset(buffer,0,64);
-	i2=0;
-	for (i=31;i>=0;i--) {
-		if (number & (1<<i))
-			buffer[i2++]='1';
-		else
-			buffer[i2++]='0';
-		if ((i&3)==0)
-			buffer[i2++]=' ';
-	}
-	pr_debug("%s\n",buffer);
-}
-#endif
-
-static const struct net_device_ops netdev_ops = {
-	.ndo_open		= xircom_open,
-	.ndo_stop		= xircom_close,
-	.ndo_start_xmit		= xircom_start_xmit,
-	.ndo_set_mac_address	= eth_mac_addr,
-	.ndo_validate_addr	= eth_validate_addr,
-#ifdef CONFIG_NET_POLL_CONTROLLER
-	.ndo_poll_controller	= xircom_poll_controller,
-#endif
-};
-
-/* xircom_probe is the code that gets called on device insertion.
-   it sets up the hardware and registers the device to the networklayer.
-
-   TODO: Send 1 or 2 "dummy" packets here as the card seems to discard the
-         first two packets that get send, and pump hates that.
-
- */
-static int xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-{
-	struct device *d = &pdev->dev;
-	struct net_device *dev = NULL;
-	struct xircom_private *private;
-	unsigned long flags;
-	unsigned short tmp16;
-	int rc;
-
-	/* First do the PCI initialisation */
-
-	rc = pci_enable_device(pdev);
-	if (rc < 0)
-		goto out;
-
-	/* disable all powermanagement */
-	pci_write_config_dword(pdev, PCI_POWERMGMT, 0x0000);
-
-	pci_set_master(pdev); /* Why isn't this done by pci_enable_device ?*/
-
-	/* clear PCI status, if any */
-	pci_read_config_word (pdev,PCI_STATUS, &tmp16);
-	pci_write_config_word (pdev, PCI_STATUS,tmp16);
-
-	rc = pci_request_regions(pdev, "xircom_cb");
-	if (rc < 0) {
-		pr_err("%s: failed to allocate io-region\n", __func__);
-		goto err_disable;
-	}
-
-	rc = -ENOMEM;
-	/*
-	   Before changing the hardware, allocate the memory.
-	   This way, we can fail gracefully if not enough memory
-	   is available.
-	 */
-	dev = alloc_etherdev(sizeof(struct xircom_private));
-	if (!dev)
-		goto err_release;
-
-	private = netdev_priv(dev);
-
-	/* Allocate the send/receive buffers */
-	private->rx_buffer = dma_alloc_coherent(d, 8192,
-						&private->rx_dma_handle,
-						GFP_KERNEL);
-	if (private->rx_buffer == NULL)
-		goto rx_buf_fail;
-
-	private->tx_buffer = dma_alloc_coherent(d, 8192,
-						&private->tx_dma_handle,
-						GFP_KERNEL);
-	if (private->tx_buffer == NULL)
-		goto tx_buf_fail;
-
-	SET_NETDEV_DEV(dev, &pdev->dev);
-
-
-	private->dev = dev;
-	private->pdev = pdev;
-
-	/* IO range. */
-	private->ioaddr = pci_iomap(pdev, 0, 0);
-	if (!private->ioaddr)
-		goto reg_fail;
-
-	spin_lock_init(&private->lock);
-
-	initialize_card(private);
-	read_mac_address(private);
-	setup_descriptors(private);
-
-	dev->netdev_ops = &netdev_ops;
-	pci_set_drvdata(pdev, dev);
-
-	rc = register_netdev(dev);
-	if (rc < 0) {
-		pr_err("%s: netdevice registration failed\n", __func__);
-		goto err_unmap;
-	}
-
-	netdev_info(dev, "Xircom cardbus revision %i at irq %i\n",
-		    pdev->revision, pdev->irq);
-	/* start the transmitter to get a heartbeat */
-	/* TODO: send 2 dummy packets here */
-	transceiver_voodoo(private);
-
-	spin_lock_irqsave(&private->lock,flags);
-	activate_transmitter(private);
-	activate_receiver(private);
-	spin_unlock_irqrestore(&private->lock,flags);
-
-	trigger_receive(private);
-out:
-	return rc;
-
-err_unmap:
-	pci_iounmap(pdev, private->ioaddr);
-reg_fail:
-	dma_free_coherent(d, 8192, private->tx_buffer, private->tx_dma_handle);
-tx_buf_fail:
-	dma_free_coherent(d, 8192, private->rx_buffer, private->rx_dma_handle);
-rx_buf_fail:
-	free_netdev(dev);
-err_release:
-	pci_release_regions(pdev);
-err_disable:
-	pci_disable_device(pdev);
-	goto out;
-}
-
-
-/*
- xircom_remove is called on module-unload or on device-eject.
- it unregisters the irq, io-region and network device.
- Interrupts and such are already stopped in the "ifconfig ethX down"
- code.
- */
-static void xircom_remove(struct pci_dev *pdev)
-{
-	struct net_device *dev = pci_get_drvdata(pdev);
-	struct xircom_private *card = netdev_priv(dev);
-	struct device *d = &pdev->dev;
-
-	unregister_netdev(dev);
-	pci_iounmap(pdev, card->ioaddr);
-	dma_free_coherent(d, 8192, card->tx_buffer, card->tx_dma_handle);
-	dma_free_coherent(d, 8192, card->rx_buffer, card->rx_dma_handle);
-	free_netdev(dev);
-	pci_release_regions(pdev);
-	pci_disable_device(pdev);
-}
-
-static irqreturn_t xircom_interrupt(int irq, void *dev_instance)
-{
-	struct net_device *dev = (struct net_device *) dev_instance;
-	struct xircom_private *card = netdev_priv(dev);
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int status;
-	int i;
-
-	spin_lock(&card->lock);
-	status = xr32(CSR5);
-
-#if defined DEBUG && DEBUG > 1
-	print_binary(status);
-	pr_debug("tx status 0x%08x 0x%08x\n",
-		 card->tx_buffer[0], card->tx_buffer[4]);
-	pr_debug("rx status 0x%08x 0x%08x\n",
-		 card->rx_buffer[0], card->rx_buffer[4]);
-#endif
-	/* Handle shared irq and hotplug */
-	if (status == 0 || status == 0xffffffff) {
-		spin_unlock(&card->lock);
-		return IRQ_NONE;
-	}
-
-	if (link_status_changed(card)) {
-		int newlink;
-		netdev_dbg(dev, "Link status has changed\n");
-		newlink = link_status(card);
-		netdev_info(dev, "Link is %d mbit\n", newlink);
-		if (newlink)
-			netif_carrier_on(dev);
-		else
-			netif_carrier_off(dev);
-
-	}
-
-	/* Clear all remaining interrupts */
-	status |= 0xffffffff; /* FIXME: make this clear only the
-				        real existing bits */
-	xw32(CSR5, status);
-
-
-	for (i=0;i<NUMDESCRIPTORS;i++)
-		investigate_write_descriptor(dev,card,i,bufferoffsets[i]);
-	for (i=0;i<NUMDESCRIPTORS;i++)
-		investigate_read_descriptor(dev,card,i,bufferoffsets[i]);
-
-	spin_unlock(&card->lock);
-	return IRQ_HANDLED;
-}
-
-static netdev_tx_t xircom_start_xmit(struct sk_buff *skb,
-					   struct net_device *dev)
-{
-	struct xircom_private *card;
-	unsigned long flags;
-	int nextdescriptor;
-	int desc;
-
-	card = netdev_priv(dev);
-	spin_lock_irqsave(&card->lock,flags);
-
-	/* First see if we can free some descriptors */
-	for (desc=0;desc<NUMDESCRIPTORS;desc++)
-		investigate_write_descriptor(dev,card,desc,bufferoffsets[desc]);
-
-
-	nextdescriptor = (card->transmit_used +1) % (NUMDESCRIPTORS);
-	desc = card->transmit_used;
-
-	/* only send the packet if the descriptor is free */
-	if (card->tx_buffer[4*desc]==0) {
-			/* Copy the packet data; zero the memory first as the card
-			   sometimes sends more than you ask it to. */
-
-			memset(&card->tx_buffer[bufferoffsets[desc]/4],0,1536);
-			skb_copy_from_linear_data(skb,
-				  &(card->tx_buffer[bufferoffsets[desc] / 4]),
-						  skb->len);
-			/* FIXME: The specification tells us that the length we send HAS to be a multiple of
-			   4 bytes. */
-
-			card->tx_buffer[4*desc+1] = cpu_to_le32(skb->len);
-			if (desc == NUMDESCRIPTORS - 1) /* bit 25: last descriptor of the ring */
-				card->tx_buffer[4*desc+1] |= cpu_to_le32(1<<25);  
-
-			card->tx_buffer[4*desc+1] |= cpu_to_le32(0xF0000000);
-						 /* 0xF0... means want interrupts*/
-			card->tx_skb[desc] = skb;
-
-			wmb();
-			/* This gives the descriptor to the card */
-			card->tx_buffer[4*desc] = cpu_to_le32(0x80000000);
-			trigger_transmit(card);
-			if (card->tx_buffer[nextdescriptor*4] & cpu_to_le32(0x8000000)) {
-				/* next descriptor is occupied... */
-				netif_stop_queue(dev);
-			}
-			card->transmit_used = nextdescriptor;
-			spin_unlock_irqrestore(&card->lock,flags);
-			return NETDEV_TX_OK;
-	}
-
-	/* Uh oh... no free descriptor... drop the packet */
-	netif_stop_queue(dev);
-	spin_unlock_irqrestore(&card->lock,flags);
-	trigger_transmit(card);
-
-	return NETDEV_TX_BUSY;
-}
-
-
-
-
-static int xircom_open(struct net_device *dev)
-{
-	struct xircom_private *xp = netdev_priv(dev);
-	const int irq = xp->pdev->irq;
-	int retval;
-
-	netdev_info(dev, "xircom cardbus adaptor found, using irq %i\n", irq);
-	retval = request_irq(irq, xircom_interrupt, IRQF_SHARED, dev->name, dev);
-	if (retval)
-		return retval;
-
-	xircom_up(xp);
-	xp->open = 1;
-
-	return 0;
-}
-
-static int xircom_close(struct net_device *dev)
-{
-	struct xircom_private *card;
-	unsigned long flags;
-
-	card = netdev_priv(dev);
-	netif_stop_queue(dev); /* we don't want new packets */
-
-
-	spin_lock_irqsave(&card->lock,flags);
-
-	disable_all_interrupts(card);
-#if 0
-	/* We can enable this again once we send dummy packets on ifconfig ethX up */
-	deactivate_receiver(card);
-	deactivate_transmitter(card);
-#endif
-	remove_descriptors(card);
-
-	spin_unlock_irqrestore(&card->lock,flags);
-
-	card->open = 0;
-	free_irq(card->pdev->irq, dev);
-
-	return 0;
-
-}
-
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void xircom_poll_controller(struct net_device *dev)
-{
-	struct xircom_private *xp = netdev_priv(dev);
-	const int irq = xp->pdev->irq;
-
-	disable_irq(irq);
-	xircom_interrupt(irq, dev);
-	enable_irq(irq);
-}
-#endif
-
-
-static void initialize_card(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned long flags;
-	u32 val;
-
-	spin_lock_irqsave(&card->lock, flags);
-
-	/* First: reset the card */
-	val = xr32(CSR0);
-	val |= 0x01;		/* Software reset */
-	xw32(CSR0, val);
-
-	udelay(100);		/* give the card some time to reset */
-
-	val = xr32(CSR0);
-	val &= ~0x01;		/* disable Software reset */
-	xw32(CSR0, val);
-
-
-	val = 0;		/* Value 0x00 is a safe and conservative value
-				   for the PCI configuration settings */
-	xw32(CSR0, val);
-
-
-	disable_all_interrupts(card);
-	deactivate_receiver(card);
-	deactivate_transmitter(card);
-
-	spin_unlock_irqrestore(&card->lock, flags);
-}
-
-/*
-trigger_transmit causes the card to check for frames to be transmitted.
-This is accomplished by writing to the CSR1 port. The documentation
-claims that the act of writing is sufficient and that the value is
-ignored; I chose zero.
-*/
-static void trigger_transmit(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-
-	xw32(CSR1, 0);
-}
-
-/*
-trigger_receive causes the card to check for empty frames in the
-descriptor list in which packets can be received.
-This is accomplished by writing to the CSR2 port. The documentation
-claims that the act of writing is sufficient and that the value is
-ignored; I chose zero.
-*/
-static void trigger_receive(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-
-	xw32(CSR2, 0);
-}
-
-/*
-setup_descriptors initializes the send and receive buffers to be valid
-descriptors and programs the addresses into the card.
-*/
-static void setup_descriptors(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	u32 address;
-	int i;
-
-	BUG_ON(card->rx_buffer == NULL);
-	BUG_ON(card->tx_buffer == NULL);
-
-	/* Receive descriptors */
-	memset(card->rx_buffer, 0, 128);	/* clear the descriptors */
-	for (i=0;i<NUMDESCRIPTORS;i++ ) {
-
-		/* Rx Descr0: It's empty, let the card own it, no errors -> 0x80000000 */
-		card->rx_buffer[i*4 + 0] = cpu_to_le32(0x80000000);
-		/* Rx Descr1: buffer 1 is 1536 bytes, buffer 2 is 0 bytes */
-		card->rx_buffer[i*4 + 1] = cpu_to_le32(1536);
-		if (i == NUMDESCRIPTORS - 1) /* bit 25 is "last descriptor" */
-			card->rx_buffer[i*4 + 1] |= cpu_to_le32(1 << 25);
-
-		/* Rx Descr2: address of the buffer
-		   we store the buffer at the 2nd half of the page */
-
-		address = card->rx_dma_handle;
-		card->rx_buffer[i*4 + 2] = cpu_to_le32(address + bufferoffsets[i]);
-		/* Rx Desc3: address of 2nd buffer -> 0 */
-		card->rx_buffer[i*4 + 3] = 0;
-	}
-
-	wmb();
-	/* Write the receive descriptor ring address to the card */
-	address = card->rx_dma_handle;
-	xw32(CSR3, address);	/* Receive descr list address */
-
-
-	/* transmit descriptors */
-	memset(card->tx_buffer, 0, 128);	/* clear the descriptors */
-
-	for (i=0;i<NUMDESCRIPTORS;i++ ) {
-		/* Tx Descr0: Empty, we own it, no errors -> 0x00000000 */
-		card->tx_buffer[i*4 + 0] = 0x00000000;
-		/* Tx Descr1: buffer 1 is 1536 bytes, buffer 2 is 0 bytes */
-		card->tx_buffer[i*4 + 1] = cpu_to_le32(1536);
-		if (i == NUMDESCRIPTORS - 1) /* bit 25 is "last descriptor" */
-			card->tx_buffer[i*4 + 1] |= cpu_to_le32(1 << 25);
-
-		/* Tx Descr2: address of the buffer
-		   we store the buffer at the 2nd half of the page */
-		address = card->tx_dma_handle;
-		card->tx_buffer[i*4 + 2] = cpu_to_le32(address + bufferoffsets[i]);
-		/* Tx Desc3: address of 2nd buffer -> 0 */
-		card->tx_buffer[i*4 + 3] = 0;
-	}
-
-	wmb();
-	/* wite the transmit descriptor ring to the card */
-	address = card->tx_dma_handle;
-	xw32(CSR4, address);	/* xmit descr list address */
-}
-
-/*
-remove_descriptors informs the card the descriptors are no longer
-valid by setting the address in the card to 0x00.
-*/
-static void remove_descriptors(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = 0;
-	xw32(CSR3, val);	/* Receive descriptor address */
-	xw32(CSR4, val);	/* Send descriptor address */
-}
-
-/*
-link_status_changed returns 1 if the card has indicated that
-the link status has changed. The new link status has to be read from CSR12.
-
-This function also clears the status-bit.
-*/
-static int link_status_changed(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = xr32(CSR5);	/* Status register */
-	if (!(val & (1 << 27)))	/* no change */
-		return 0;
-
-	/* clear the event by writing a 1 to the bit in the
-	   status register. */
-	val = (1 << 27);
-	xw32(CSR5, val);
-
-	return 1;
-}
-
-
-/*
-transmit_active returns 1 if the transmitter on the card is
-in a non-stopped state.
-*/
-static int transmit_active(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-
-	if (!(xr32(CSR5) & (7 << 20)))	/* transmitter disabled */
-		return 0;
-
-	return 1;
-}
-
-/*
-receive_active returns 1 if the receiver on the card is
-in a non-stopped state.
-*/
-static int receive_active(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-
-	if (!(xr32(CSR5) & (7 << 17)))	/* receiver disabled */
-		return 0;
-
-	return 1;
-}
-
-/*
-activate_receiver enables the receiver on the card.
-Before being allowed to active the receiver, the receiver
-must be completely de-activated. To achieve this,
-this code actually disables the receiver first; then it waits for the
-receiver to become inactive, then it activates the receiver and then
-it waits for the receiver to be active.
-
-must be called with the lock held and interrupts disabled.
-*/
-static void activate_receiver(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-	int counter;
-
-	val = xr32(CSR6);	/* Operation mode */
-
-	/* If the "active" bit is set and the receiver is already
-	   active, no need to do the expensive thing */
-	if ((val&2) && (receive_active(card)))
-		return;
-
-
-	val = val & ~2;		/* disable the receiver */
-	xw32(CSR6, val);
-
-	counter = 10;
-	while (counter > 0) {
-		if (!receive_active(card))
-			break;
-		/* wait a while */
-		udelay(50);
-		counter--;
-		if (counter <= 0)
-			netdev_err(card->dev, "Receiver failed to deactivate\n");
-	}
-
-	/* enable the receiver */
-	val = xr32(CSR6);	/* Operation mode */
-	val = val | 2;		/* enable the receiver */
-	xw32(CSR6, val);
-
-	/* now wait for the card to activate again */
-	counter = 10;
-	while (counter > 0) {
-		if (receive_active(card))
-			break;
-		/* wait a while */
-		udelay(50);
-		counter--;
-		if (counter <= 0)
-			netdev_err(card->dev,
-				   "Receiver failed to re-activate\n");
-	}
-}
-
-/*
-deactivate_receiver disables the receiver on the card.
-To achieve this this code disables the receiver first;
-then it waits for the receiver to become inactive.
-
-must be called with the lock held and interrupts disabled.
-*/
-static void deactivate_receiver(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-	int counter;
-
-	val = xr32(CSR6);	/* Operation mode */
-	val = val & ~2;		/* disable the receiver */
-	xw32(CSR6, val);
-
-	counter = 10;
-	while (counter > 0) {
-		if (!receive_active(card))
-			break;
-		/* wait a while */
-		udelay(50);
-		counter--;
-		if (counter <= 0)
-			netdev_err(card->dev, "Receiver failed to deactivate\n");
-	}
-}
-
-
-/*
-activate_transmitter enables the transmitter on the card.
-Before being allowed to active the transmitter, the transmitter
-must be completely de-activated. To achieve this,
-this code actually disables the transmitter first; then it waits for the
-transmitter to become inactive, then it activates the transmitter and then
-it waits for the transmitter to be active again.
-
-must be called with the lock held and interrupts disabled.
-*/
-static void activate_transmitter(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-	int counter;
-
-	val = xr32(CSR6);	/* Operation mode */
-
-	/* If the "active" bit is set and the receiver is already
-	   active, no need to do the expensive thing */
-	if ((val&(1<<13)) && (transmit_active(card)))
-		return;
-
-	val = val & ~(1 << 13);	/* disable the transmitter */
-	xw32(CSR6, val);
-
-	counter = 10;
-	while (counter > 0) {
-		if (!transmit_active(card))
-			break;
-		/* wait a while */
-		udelay(50);
-		counter--;
-		if (counter <= 0)
-			netdev_err(card->dev,
-				   "Transmitter failed to deactivate\n");
-	}
-
-	/* enable the transmitter */
-	val = xr32(CSR6);	/* Operation mode */
-	val = val | (1 << 13);	/* enable the transmitter */
-	xw32(CSR6, val);
-
-	/* now wait for the card to activate again */
-	counter = 10;
-	while (counter > 0) {
-		if (transmit_active(card))
-			break;
-		/* wait a while */
-		udelay(50);
-		counter--;
-		if (counter <= 0)
-			netdev_err(card->dev,
-				   "Transmitter failed to re-activate\n");
-	}
-}
-
-/*
-deactivate_transmitter disables the transmitter on the card.
-To achieve this this code disables the transmitter first;
-then it waits for the transmitter to become inactive.
-
-must be called with the lock held and interrupts disabled.
-*/
-static void deactivate_transmitter(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-	int counter;
-
-	val = xr32(CSR6);	/* Operation mode */
-	val = val & ~2;		/* disable the transmitter */
-	xw32(CSR6, val);
-
-	counter = 20;
-	while (counter > 0) {
-		if (!transmit_active(card))
-			break;
-		/* wait a while */
-		udelay(50);
-		counter--;
-		if (counter <= 0)
-			netdev_err(card->dev,
-				   "Transmitter failed to deactivate\n");
-	}
-}
-
-
-/*
-enable_transmit_interrupt enables the transmit interrupt
-
-must be called with the lock held and interrupts disabled.
-*/
-static void enable_transmit_interrupt(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = xr32(CSR7);	/* Interrupt enable register */
-	val |= 1;		/* enable the transmit interrupt */
-	xw32(CSR7, val);
-}
-
-
-/*
-enable_receive_interrupt enables the receive interrupt
-
-must be called with the lock held and interrupts disabled.
-*/
-static void enable_receive_interrupt(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = xr32(CSR7);	/* Interrupt enable register */
-	val = val | (1 << 6);	/* enable the receive interrupt */
-	xw32(CSR7, val);
-}
-
-/*
-enable_link_interrupt enables the link status change interrupt
-
-must be called with the lock held and interrupts disabled.
-*/
-static void enable_link_interrupt(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = xr32(CSR7);	/* Interrupt enable register */
-	val = val | (1 << 27);	/* enable the link status chage interrupt */
-	xw32(CSR7, val);
-}
-
-
-
-/*
-disable_all_interrupts disables all interrupts
-
-must be called with the lock held and interrupts disabled.
-*/
-static void disable_all_interrupts(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-
-	xw32(CSR7, 0);
-}
-
-/*
-enable_common_interrupts enables several weird interrupts
-
-must be called with the lock held and interrupts disabled.
-*/
-static void enable_common_interrupts(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = xr32(CSR7);	/* Interrupt enable register */
-	val |= (1<<16); /* Normal Interrupt Summary */
-	val |= (1<<15); /* Abnormal Interrupt Summary */
-	val |= (1<<13); /* Fatal bus error */
-	val |= (1<<8);  /* Receive Process Stopped */
-	val |= (1<<7);  /* Receive Buffer Unavailable */
-	val |= (1<<5);  /* Transmit Underflow */
-	val |= (1<<2);  /* Transmit Buffer Unavailable */
-	val |= (1<<1);  /* Transmit Process Stopped */
-	xw32(CSR7, val);
-}
-
-/*
-enable_promisc starts promisc mode
-
-must be called with the lock held and interrupts disabled.
-*/
-static int enable_promisc(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned int val;
-
-	val = xr32(CSR6);
-	val = val | (1 << 6);
-	xw32(CSR6, val);
-
-	return 1;
-}
-
-
-
-
-/*
-link_status() checks the links status and will return 0 for no link, 10 for 10mbit link and 100 for.. guess what.
-
-Must be called in locked state with interrupts disabled
-*/
-static int link_status(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	u8 val;
-
-	val = xr8(CSR12);
-
-	/* bit 2 is 0 for 10mbit link, 1 for not an 10mbit link */
-	if (!(val & (1 << 2)))
-		return 10;
-	/* bit 1 is 0 for 100mbit link, 1 for not an 100mbit link */
-	if (!(val & (1 << 1)))
-		return 100;
-
-	/* If we get here -> no link at all */
-
-	return 0;
-}
-
-
-
-
-
-/*
-  read_mac_address() reads the MAC address from the NIC and stores it in the "dev" structure.
-
-  This function will take the spinlock itself and can, as a result, not be called with the lock helt.
- */
-static void read_mac_address(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned long flags;
-	u8 link;
-	int i;
-
-	spin_lock_irqsave(&card->lock, flags);
-
-	xw32(CSR9, 1 << 12);	/* enable boot rom access */
-	for (i = 0x100; i < 0x1f7; i += link + 2) {
-		u8 tuple, data_id, data_count;
-
-		xw32(CSR10, i);
-		tuple = xr32(CSR9);
-		xw32(CSR10, i + 1);
-		link = xr32(CSR9);
-		xw32(CSR10, i + 2);
-		data_id = xr32(CSR9);
-		xw32(CSR10, i + 3);
-		data_count = xr32(CSR9);
-		if ((tuple == 0x22) && (data_id == 0x04) && (data_count == 0x06)) {
-			u8 addr[ETH_ALEN];
-			int j;
-
-			for (j = 0; j < 6; j++) {
-				xw32(CSR10, i + j + 4);
-				addr[j] = xr32(CSR9) & 0xff;
-			}
-			eth_hw_addr_set(card->dev, addr);
-			break;
-		} else if (link == 0) {
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&card->lock, flags);
-	pr_debug(" %pM\n", card->dev->dev_addr);
-}
-
-
-/*
- transceiver_voodoo() enables the external UTP plug thingy.
- it's called voodoo as I stole this code and cannot cross-reference
- it with the specification.
- */
-static void transceiver_voodoo(struct xircom_private *card)
-{
-	void __iomem *ioaddr = card->ioaddr;
-	unsigned long flags;
-
-	/* disable all powermanagement */
-	pci_write_config_dword(card->pdev, PCI_POWERMGMT, 0x0000);
-
-	setup_descriptors(card);
-
-	spin_lock_irqsave(&card->lock, flags);
-
-	xw32(CSR15, 0x0008);
-	udelay(25);
-	xw32(CSR15, 0xa8050000);
-	udelay(25);
-	xw32(CSR15, 0xa00f0000);
-	udelay(25);
-
-	spin_unlock_irqrestore(&card->lock, flags);
-
-	netif_start_queue(card->dev);
-}
-
-
-static void xircom_up(struct xircom_private *card)
-{
-	unsigned long flags;
-	int i;
-
-	/* disable all powermanagement */
-	pci_write_config_dword(card->pdev, PCI_POWERMGMT, 0x0000);
-
-	setup_descriptors(card);
-
-	spin_lock_irqsave(&card->lock, flags);
-
-
-	enable_link_interrupt(card);
-	enable_transmit_interrupt(card);
-	enable_receive_interrupt(card);
-	enable_common_interrupts(card);
-	enable_promisc(card);
-
-	/* The card can have received packets already, read them away now */
-	for (i=0;i<NUMDESCRIPTORS;i++)
-		investigate_read_descriptor(card->dev,card,i,bufferoffsets[i]);
-
-
-	spin_unlock_irqrestore(&card->lock, flags);
-	trigger_receive(card);
-	trigger_transmit(card);
-	netif_start_queue(card->dev);
-}
-
-/* Bufferoffset is in BYTES */
-static void
-investigate_read_descriptor(struct net_device *dev, struct xircom_private *card,
-			    int descnr, unsigned int bufferoffset)
-{
-	int status;
-
-	status = le32_to_cpu(card->rx_buffer[4*descnr]);
-
-	if (status > 0) {		/* packet received */
-
-		/* TODO: discard error packets */
-
-		short pkt_len = ((status >> 16) & 0x7ff) - 4;
-					/* minus 4, we don't want the CRC */
-		struct sk_buff *skb;
-
-		if (pkt_len > 1518) {
-			netdev_err(dev, "Packet length %i is bogus\n", pkt_len);
-			pkt_len = 1518;
-		}
-
-		skb = netdev_alloc_skb(dev, pkt_len + 2);
-		if (skb == NULL) {
-			dev->stats.rx_dropped++;
-			goto out;
-		}
-		skb_reserve(skb, 2);
-		skb_copy_to_linear_data(skb,
-					&card->rx_buffer[bufferoffset / 4],
-					pkt_len);
-		skb_put(skb, pkt_len);
-		skb->protocol = eth_type_trans(skb, dev);
-		netif_rx(skb);
-		dev->stats.rx_packets++;
-		dev->stats.rx_bytes += pkt_len;
-
-out:
-		/* give the buffer back to the card */
-		card->rx_buffer[4*descnr] = cpu_to_le32(0x80000000);
-		trigger_receive(card);
-	}
-}
-
-
-/* Bufferoffset is in BYTES */
-static void
-investigate_write_descriptor(struct net_device *dev,
-			     struct xircom_private *card,
-			     int descnr, unsigned int bufferoffset)
-{
-	int status;
-
-	status = le32_to_cpu(card->tx_buffer[4*descnr]);
-#if 0
-	if (status & 0x8000) {	/* Major error */
-		pr_err("Major transmit error status %x\n", status);
-		card->tx_buffer[4*descnr] = 0;
-		netif_wake_queue (dev);
-	}
-#endif
-	if (status > 0) {	/* bit 31 is 0 when done */
-		if (card->tx_skb[descnr]!=NULL) {
-			dev->stats.tx_bytes += card->tx_skb[descnr]->len;
-			dev_kfree_skb_irq(card->tx_skb[descnr]);
-		}
-		card->tx_skb[descnr] = NULL;
-		/* Bit 8 in the status field is 1 if there was a collision */
-		if (status & (1 << 8))
-			dev->stats.collisions++;
-		card->tx_buffer[4*descnr] = 0; /* descriptor is free again */
-		netif_wake_queue (dev);
-		dev->stats.tx_packets++;
-	}
-}
-
-module_pci_driver(xircom_driver);
-- 
2.43.0