static char *version =	"d_link.c: $Revision: 0.32 $,  Bjorn Ekwall (bj0rn@blox.se)\n";/* *	d_link.c * *	Linux driver for the D-Link DE-600 Ethernet pocket adapter. * *	Portions (C) Copyright 1993 by Bjorn Ekwall *	The Author may be reached as bj0rn@blox.se * *	Based on adapter information gathered from DE600.ASM by D-Link Inc., *	as included on disk C in the v.2.11 of PC/TCP from FTP Software. *	For DE600.asm: *		Portions (C) Copyright 1990 D-Link, Inc. *		Copyright, 1988-1992, Russell Nelson, Crynwr Software * *	Adapted to the sample network driver core for linux, *	written by: Donald Becker <becker@super.org> *	C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715 * *	compile-command: *	"gcc -D__KERNEL__  -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer \ *	 -m486 -DD_LINK_IO=0x378 -DD_LINK_IRQ=7 -UD_LINK_DEBUG -S d_link.c * **************************************************************//* *	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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.  * **************************************************************//* Add another "; SLOW_DOWN_IO" here if your adapter won't work OK: */#define D_LINK_SLOW_DOWN SLOW_DOWN_IO; SLOW_DOWN_IO; SLOW_DOWN_IO /* * If you still have trouble reading/writing to the adapter, * modify the following "#define": (see <asm/io.h> for more info)#define REALLY_SLOW_IO */#define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) *//* * For fix to TCP "slowdown", take a look at the "#define D_LINK_MAX_WINDOW" * near the end of the file... *//* use 0 for production, 1 for verification, >2 for debug */#ifdef D_LINK_DEBUG#define PRINTK(x) if (d_link_debug >= 2) printk x#else#define D_LINK_DEBUG 0#define PRINTK(x) /**/#endifstatic unsigned int d_link_debug = D_LINK_DEBUG;#include <linux/config.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/types.h>#include <linux/fcntl.h>#include <linux/string.h>#include <linux/interrupt.h>#include <asm/io.h>#include <netinet/in.h>#include <linux/ptrace.h>#include <asm/system.h>#include <errno.h>#include "inet.h"#include "dev.h"#include "eth.h"#include "ip.h"#include "route.h"#include "protocol.h"#include "tcp.h"#include "skbuff.h"#include "sock.h"#include "arp.h"#define netstats enet_statistics#ifndef HAVE_ALLOC_SKB#define alloc_skb(size,pri)	(struct sk_buff *)kmalloc(size,pri)#endif/************************************************** *                                                * * Definition of D-Link Ethernet Pocket adapter   * *                                                * **************************************************//* * D-Link Ethernet pocket adapter ports *//* * OK, so I'm cheating, but there are an awful lot of * reads and writes in order to get anything in and out * of the DE-600 with 4 bits at a time in the parallel port, * so every saved instruction really helps :-) * * That is, I don't care what the device struct says * but hope that Space.c will keep the rest of the drivers happy. */#ifndef D_LINK_IO#define D_LINK_IO 0x378#endif#define DATA_PORT	(D_LINK_IO)#define STATUS_PORT	(D_LINK_IO + 1)#define COMMAND_PORT	(D_LINK_IO + 2)#ifndef D_LINK_IRQ#define D_LINK_IRQ	7#endif/* * It really should look like this, and autoprobing as well... *#define DATA_PORT	(dev->base_addr + 0)#define STATUS_PORT	(dev->base_addr + 1)#define COMMAND_PORT	(dev->base_addr + 2)#define D_LINK_IRQ	dev->irq *//* * D-Link COMMAND_PORT commands */#define SELECT_NIC	0x04 /* select Network Interface Card */#define SELECT_PRN	0x1c /* select Printer */#define NML_PRN		0xec /* normal Printer situation */#define IRQEN		0x10 /* enable IRQ line *//* * D-Link STATUS_PORT */#define RX_BUSY		0x80#define RX_GOOD		0x40#define TX_FAILED16	0x10#define TX_BUSY		0x08/* * D-Link DATA_PORT commands * command in low 4 bits * data in high 4 bits * select current data nibble with HI_NIBBLE bit */#define WRITE_DATA	0x00 /* write memory */#define READ_DATA	0x01 /* read memory */#define STATUS		0x02 /* read  status register */#define COMMAND		0x03 /* write command register (see COMMAND below) */#define NULL_COMMAND	0x04 /* null command */#define RX_LEN		0x05 /* read  received packet length */#define TX_ADDR		0x06 /* set adapter transmit memory address */#define RW_ADDR		0x07 /* set adapter read/write memory address */#define HI_NIBBLE	0x08 /* read/write the high nibble of data,				or-ed with rest of command *//* * command register, accessed through DATA_PORT with low bits = COMMAND */#define RX_ALL		0x01 /* PROMISCIOUS */#define RX_BP		0x02 /* default: BROADCAST & PHYSICAL ADRESS */#define RX_MBP		0x03 /* MULTICAST, BROADCAST & PHYSICAL ADRESS */#define TX_ENABLE	0x04 /* bit 2 */#define RX_ENABLE	0x08 /* bit 3 */#define RESET		0x80 /* set bit 7 high */#define STOP_RESET	0x00 /* set bit 7 low *//* * data to command register * (high 4 bits in write to DATA_PORT) */#define RX_PAGE2_SELECT	0x10 /* bit 4, only 2 pages to select */#define RX_BASE_PAGE	0x20 /* bit 5, always set when specifying RX_ADDR */#define FLIP_IRQ	0x40 /* bit 6 *//* * D-Link adapter internal memory: * * 0-2K 1:st transmit page (send from pointer up to 2K) * 2-4K	2:nd transmit page (send from pointer up to 4K) * * 4-6K 1:st receive page (data from 4K upwards) * 6-8K 2:nd receive page (data from 6K upwards) * * 8K+	Adapter ROM (contains magic code and last 3 bytes of Ethernet address) */#define MEM_2K		0x0800 /* 2048 */#define MEM_4K		0x1000 /* 4096 */#define MEM_6K		0x1800 /* 6144 */#define NODE_ADDRESS	0x2000 /* 8192 */#define RUNT 60		/* Too small Ethernet packet *//************************************************** *                                                * *             End of definition                  * *                                                * **************************************************//* * Index to functions, as function prototypes. *//* For tricking tcp.c to announce a small max window (max 2 fast packets please :-) */static unsigned long	d_link_rspace(struct sock *sk);/* Routines used internally. (See "convenience macros") */static int		d_link_read_status(struct device *dev);static unsigned	char	d_link_read_byte(unsigned char type, struct device *dev);/* Put in the device structure. */static int	d_link_open(struct device *dev);static int	d_link_close(struct device *dev);static struct netstats *get_stats(struct device *dev);static int	d_link_start_xmit(struct sk_buff *skb, struct device *dev);/* Dispatch from interrupts. */static void	d_link_interrupt(int reg_ptr);static int	d_link_tx_intr(struct device *dev, int irq_status);static void	d_link_rx_intr(struct device *dev);/* Initialization */static void	trigger_interrupt(struct device *dev);int		d_link_init(struct device *dev);static void	adapter_init(struct device *dev);/* * D-Link driver variables: */extern struct device		*irq2dev_map[16];static volatile int		rx_page		= 0;#define TX_PAGES 2static volatile int		tx_fifo[TX_PAGES];static volatile int		tx_fifo_in = 0;static volatile int		tx_fifo_out = 0;static volatile int		free_tx_pages = TX_PAGES;/* * Convenience macros/functions for D-Link adapter */#define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); D_LINK_SLOW_DOWN#define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); D_LINK_SLOW_DOWN/* Thanks for hints from Mark Burton <markb@ordern.demon.co.uk> */#define d_link_put_byte(data) ( \	outb_p(((data) << 4)   | WRITE_DATA            , DATA_PORT), \	outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT))/* * The first two outb_p()'s below could perhaps be deleted if there * would be more delay in the last two. Not certain about it yet... */#define d_link_put_command(cmd) ( \	outb_p(( rx_page        << 4)   | COMMAND            , DATA_PORT), \	outb_p(( rx_page        & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT), \	outb_p(((rx_page | cmd) << 4)   | COMMAND            , DATA_PORT), \	outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT))#define d_link_setup_address(addr,type) ( \	outb_p((((addr) << 4) & 0xf0) | type            , DATA_PORT), \	outb_p(( (addr)       & 0xf0) | type | HI_NIBBLE, DATA_PORT), \	outb_p((((addr) >> 4) & 0xf0) | type            , DATA_PORT), \	outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT))#define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K))/* Flip bit, only 2 pages */#define next_rx_page() (rx_page ^= RX_PAGE2_SELECT)#define tx_page_adr(a) (((a) + 1) * MEM_2K)static inline intd_link_read_status(struct device *dev){	int	status;	outb_p(STATUS, DATA_PORT);	status = inb(STATUS_PORT);	outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);	return status;}static inline unsigned chard_link_read_byte(unsigned char type, struct device *dev) { /* dev used by macros */	unsigned char	lo;	(void)outb_p((type), DATA_PORT);	lo = ((unsigned char)inb(STATUS_PORT)) >> 4;	(void)outb_p((type) | HI_NIBBLE, DATA_PORT);	return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;}/* * Open/initialize the board.  This is called (in the current kernel) * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1). * * This routine should set everything up anew at each open, even * registers that "should" only need to be set once at boot, so that * there is a non-reboot way to recover if something goes wrong. */static intd_link_open(struct device *dev){	extern struct proto tcp_prot;	if (request_irq(D_LINK_IRQ, d_link_interrupt)) {		printk ("%s: unable to get IRQ %d\n", dev->name, D_LINK_IRQ);		return 1;	}	irq2dev_map[D_LINK_IRQ] = dev;	adapter_init(dev);	/*	 * Yes, I know!	 * This is really not nice, but since a machine that uses DE-600	 * rarely uses any other TCP/IP connection device simultaneously,	 * this hack shouldn't really slow anything up.	 * (I don't know about slip though... but it won't break it)	 *	 * This fix is better than changing in tcp.h IMHO	 */	tcp_prot.rspace = d_link_rspace; /* was: sock_rspace */	return 0;}/* * The inverse routine to d_link_open(). */static intd_link_close(struct device *dev){	select_nic();	rx_page = 0;	d_link_put_command(RESET);	d_link_put_command(STOP_RESET);	d_link_put_command(0);	select_prn();	free_irq(D_LINK_IRQ);	irq2dev_map[D_LINK_IRQ] = NULL;	dev->start = 0;	tcp_prot.rspace = sock_rspace; /* see comment above! */	return 0;}static struct netstats *get_stats(struct device *dev){    return (struct netstats *)(dev->priv);}static inline voidtrigger_interrupt(struct device *dev){	d_link_put_command(FLIP_IRQ);	select_prn();	D_LINK_SLOW_DOWN;	select_nic();	d_link_put_command(0);}/* * Copy a buffer to the adapter transmit page memory. * Start sending. */static intd_link_start_xmit(struct sk_buff *skb, struct device *dev)