path: root/drivers/net/tulip/xircom_cb.c

/*
 * 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 $
 */

#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/init.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#ifdef CONFIG_NET_POLL_CONTROLLER
#include <asm/irq.h>
#endif

#ifdef DEBUG
#define enter(x)   printk("Enter: %s, %s line %i\n",x,__FILE__,__LINE__)
#define leave(x)   printk("Leave: %s, %s line %i\n",x,__FILE__,__LINE__)
#else
#define enter(x)   do {} while (0)
#define leave(x)   do {} while (0)
#endif


MODULE_DESCRIPTION("Xircom Cardbus ethernet driver");
MODULE_AUTHOR("Arjan van de Ven <arjanv@redhat.com>");
MODULE_LICENSE("GPL");



/* 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 */

	unsigned int *rx_buffer;
	unsigned int *tx_buffer;

	dma_addr_t rx_dma_handle;
	dma_addr_t tx_dma_handle;

	struct sk_buff *tx_skb[4];

	unsigned long io_port;
	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;
	struct net_device_stats stats;
};


/* 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 int 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);
static struct net_device_stats *xircom_get_stats(struct net_device *dev);
#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,