path: root/drivers/net/arm/ether1.c

/*
 *  linux/drivers/acorn/net/ether1.c
 *
 *  Copyright (C) 1996-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Acorn ether1 driver (82586 chip) for Acorn machines
 *
 * We basically keep two queues in the cards memory - one for transmit
 * and one for receive.  Each has a head and a tail.  The head is where
 * we/the chip adds packets to be transmitted/received, and the tail
 * is where the transmitter has got to/where the receiver will stop.
 * Both of these queues are circular, and since the chip is running
 * all the time, we have to be careful when we modify the pointers etc
 * so that the buffer memory contents is valid all the time.
 *
 * Change log:
 * 1.00	RMK			Released
 * 1.01	RMK	19/03/1996	Transfers the last odd byte onto/off of the card now.
 * 1.02	RMK	25/05/1997	Added code to restart RU if it goes not ready
 * 1.03	RMK	14/09/1997	Cleaned up the handling of a reset during the TX interrupt.
 *				Should prevent lockup.
 * 1.04 RMK	17/09/1997	Added more info when initialsation of chip goes wrong.
 *				TDR now only reports failure when chip reports non-zero
 *				TDR time-distance.
 * 1.05	RMK	31/12/1997	Removed calls to dev_tint for 2.1
 * 1.06	RMK	10/02/2000	Updated for 2.3.43
 * 1.07	RMK	13/05/2000	Updated for 2.3.99-pre8
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/ecard.h>

#define __ETHER1_C
#include "ether1.h"

static unsigned int net_debug = NET_DEBUG;

#define BUFFER_SIZE	0x10000
#define TX_AREA_START	0x00100
#define TX_AREA_END	0x05000
#define RX_AREA_START	0x05000
#define RX_AREA_END	0x0fc00

static int ether1_open(struct net_device *dev);
static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t ether1_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static int ether1_close(struct net_device *dev);
static struct net_device_stats *ether1_getstats(struct net_device *dev);
static void ether1_setmulticastlist(struct net_device *dev);
static void ether1_timeout(struct net_device *dev);

/* ------------------------------------------------------------------------- */

static char version[] __initdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";

#define BUS_16 16
#define BUS_8  8

/* ------------------------------------------------------------------------- */

#define DISABLEIRQS 1
#define NORMALIRQS  0

#define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
#define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)

static inline unsigned short
ether1_inw_p (struct net_device *dev, int addr, int svflgs)
{
	unsigned long flags;
	unsigned short ret;

	if (svflgs)
		local_irq_save (flags);

	writeb(addr >> 12, REG_PAGE);
	ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
	if (svflgs)
		local_irq_restore (flags);
	return ret;
}

static inline void
ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
{
	unsigned long flags;

	if (svflgs)
		local_irq_save (flags);

	writeb(addr >> 12, REG_PAGE);
	writew(val, ETHER1_RAM + ((addr & 4095) << 1));
	if (svflgs)
		local_irq_restore (flags);
}

/*
 * Some inline assembler to allow fast transfers on to/off of the card.
 * Since this driver depends on some features presented by the ARM
 * specific architecture, and that you can't configure this driver
 * without specifiing ARM mode, this is not a problem.
 *
 * This routine is essentially an optimised memcpy from the card's
 * onboard RAM to kernel memory.
 */
static void
ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
{
	unsigned int page, thislen, offset;
	void __iomem *addr;

	offset = start & 4095;
	page = start >> 12;
	addr = ETHER1_RAM + (offset << 1);

	if (offset + length > 4096)
		thislen = 4096 - offset;
	else
		thislen = length;

	do {
		int used;

		writeb(page