Orange Pi5 kernel

 /* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  NET  is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions used by the ARCnet driver.
 *
 * Authors:     Avery Pennarun and David Woodhouse
 */
#ifndef _LINUX_ARCDEVICE_H
#define _LINUX_ARCDEVICE_H
 
#include <asm/timex.h>
#include <linux/if_arcnet.h>
 
#ifdef __KERNEL__
#include <linux/interrupt.h>
 
/*
 * RECON_THRESHOLD is the maximum number of RECON messages to receive
 * within one minute before printing a "cabling problem" warning. The
 * default value should be fine.
 *
 * After that, a "cabling restored" message will be printed on the next IRQ
 * if no RECON messages have been received for 10 seconds.
 *
 * Do not define RECON_THRESHOLD at all if you want to disable this feature.
 */
#define RECON_THRESHOLD 30
 
/*
 * Define this to the minimum "timeout" value.  If a transmit takes longer
 * than TX_TIMEOUT jiffies, Linux will abort the TX and retry.  On a large
 * network, or one with heavy network traffic, this timeout may need to be
 * increased.  The larger it is, though, the longer it will be between
 * necessary transmits - don't set this too high.
 */
#define TX_TIMEOUT (HZ * 200 / 1000)
 
/* Display warnings about the driver being an ALPHA version. */
#undef ALPHA_WARNING
 
/*
 * Debugging bitflags: each option can be enabled individually.
 *
 * Note: only debug flags included in the ARCNET_DEBUG_MAX define will
 *   actually be available.  GCC will (at least, GCC 2.7.0 will) notice
 *   lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize
 *   them out.
 */
#define D_NORMAL	1	/* important operational info             */
#define D_EXTRA		2	/* useful, but non-vital information      */
#define	D_INIT		4	/* show init/probe messages               */
#define D_INIT_REASONS	8	/* show reasons for discarding probes     */
#define D_RECON		32	/* print a message whenever token is lost */
#define D_PROTO		64	/* debug auto-protocol support            */
/* debug levels below give LOTS of output during normal operation! */
#define D_DURING	128	/* trace operations (including irq's)     */
#define D_TX	        256	/* show tx packets                        */
#define D_RX		512	/* show rx packets                        */
#define D_SKB		1024	/* show skb's                             */
#define D_SKB_SIZE	2048	/* show skb sizes			  */
#define D_TIMING	4096	/* show time needed to copy buffers to card */
#define D_DEBUG         8192    /* Very detailed debug line for line */
 
#ifndef ARCNET_DEBUG_MAX
#define ARCNET_DEBUG_MAX (127)	/* change to ~0 if you want detailed debugging */
#endif
 
#ifndef ARCNET_DEBUG
#define ARCNET_DEBUG (D_NORMAL | D_EXTRA)
#endif
extern int arcnet_debug;
 
#define BUGLVL(x)	((x) & ARCNET_DEBUG_MAX & arcnet_debug)
 
/* macros to simplify debug checking */
#define arc_printk(x, dev, fmt, ...)					\
do {									\
<------>if (BUGLVL(x)) {						\
<------><------>if ((x) == D_NORMAL)					\
<------><------><------>netdev_warn(dev, fmt, ##__VA_ARGS__);		\
<------><------>else if ((x) < D_DURING)				\
<------><------><------>netdev_info(dev, fmt, ##__VA_ARGS__);		\
<------><------>else							\
<------><------><------>netdev_dbg(dev, fmt, ##__VA_ARGS__);		\
<------>}								\
} while (0)
 
#define arc_cont(x, fmt, ...)						\
do {									\
<------>if (BUGLVL(x))							\
<------><------>pr_cont(fmt, ##__VA_ARGS__);				\
} while (0)
 
/* see how long a function call takes to run, expressed in CPU cycles */
#define TIME(dev, name, bytes, call)					\
do {									\
<------>if (BUGLVL(D_TIMING)) {						\
<------><------>unsigned long _x, _y;					\
<------><------>_x = get_cycles();					\
<------><------>call;							\
<------><------>_y = get_cycles();					\
<------><------>arc_printk(D_TIMING, dev,				\
<------><------><------>   "%s: %d bytes in %lu cycles == %lu Kbytes/100Mcycle\n", \
<------><------><------>   name, bytes, _y - _x,			\
<------><------><------>   100000000 / 1024 * bytes / (_y - _x + 1));	\
<------>} else {							\
<------><------>call;							\
<------>}								\
} while (0)
 
/*
 * Time needed to reset the card - in ms (milliseconds).  This works on my
 * SMC PC100.  I can't find a reference that tells me just how long I
 * should wait.
 */
#define RESETtime (300)
 
/*
 * These are the max/min lengths of packet payload, not including the
 * arc_hardware header, but definitely including the soft header.
 *
 * Note: packet sizes 254, 255, 256 are impossible because of the way
 * ARCnet registers work  That's why RFC1201 defines "exception" packets.
 * In non-RFC1201 protocols, we have to just tack some extra bytes on the
 * end.
 */
#define MTU	253		/* normal packet max size */
#define MinTU	257		/* extended packet min size */
#define XMTU	508		/* extended packet max size */
 
/* status/interrupt mask bit fields */
#define TXFREEflag	0x01	/* transmitter available */
#define TXACKflag       0x02	/* transmitted msg. ackd */
#define RECONflag       0x04	/* network reconfigured */
#define TESTflag        0x08	/* test flag */
#define EXCNAKflag      0x08    /* excesive nak flag */
#define RESETflag       0x10	/* power-on-reset */
#define RES1flag        0x20	/* reserved - usually set by jumper */
#define RES2flag        0x40	/* reserved - usually set by jumper */
#define NORXflag        0x80	/* receiver inhibited */
 
/* Flags used for IO-mapped memory operations */
#define AUTOINCflag     0x40	/* Increase location with each access */
#define IOMAPflag       0x02	/* (for 90xx) Use IO mapped memory, not mmap */
#define ENABLE16flag    0x80	/* (for 90xx) Enable 16-bit mode */
 
/* in the command register, the following bits have these meanings:
 *                0-2     command
 *                3-4     page number (for enable rcv/xmt command)
 *                 7      receive broadcasts
 */
#define NOTXcmd         0x01	/* disable transmitter */
#define NORXcmd         0x02	/* disable receiver */
#define TXcmd           0x03	/* enable transmitter */
#define RXcmd           0x04	/* enable receiver */
#define CONFIGcmd       0x05	/* define configuration */
#define CFLAGScmd       0x06	/* clear flags */
#define TESTcmd         0x07	/* load test flags */
#define STARTIOcmd      0x18	/* start internal operation */
 
/* flags for "clear flags" command */
#define RESETclear      0x08	/* power-on-reset */
#define CONFIGclear     0x10	/* system reconfigured */
 
#define EXCNAKclear     0x0E    /* Clear and acknowledge the excive nak bit */
 
/* flags for "load test flags" command */
#define TESTload        0x08	/* test flag (diagnostic) */
 
/* byte deposited into first address of buffers on reset */
#define TESTvalue       0321	/* that's octal for 0xD1 :) */
 
/* for "enable receiver" command */
#define RXbcasts        0x80	/* receive broadcasts */
 
/* flags for "define configuration" command */
#define NORMALconf      0x00	/* 1-249 byte packets */
#define EXTconf         0x08	/* 250-504 byte packets */
 
/* card feature flags, set during auto-detection.
 * (currently only used by com20020pci)
 */
#define ARC_IS_5MBIT    1   /* card default speed is 5MBit */
#define ARC_CAN_10MBIT  2   /* card uses COM20022, supporting 10MBit,
<------><------><------><------> but default is 2.5MBit. */
 
/* information needed to define an encapsulation driver */
struct ArcProto {
<------>char suffix;		/* a for RFC1201, e for ether-encap, etc. */
<------>int mtu;		/* largest possible packet */
<------>int is_ip;              /* This is a ip plugin - not a raw thing */
 
<------>void (*rx)(struct net_device *dev, int bufnum,
<------><------>   struct archdr *pkthdr, int length);
<------>int (*build_header)(struct sk_buff *skb, struct net_device *dev,
<------><------><------>    unsigned short ethproto, uint8_t daddr);
 
<------>/* these functions return '1' if the skb can now be freed */
<------>int (*prepare_tx)(struct net_device *dev, struct archdr *pkt,
<------><------><------>  int length, int bufnum);
<------>int (*continue_tx)(struct net_device *dev, int bufnum);
<------>int (*ack_tx)(struct net_device *dev, int acked);
};
 
extern struct ArcProto *arc_proto_map[256], *arc_proto_default,
<------>*arc_bcast_proto, *arc_raw_proto;
 
/*
 * "Incoming" is information needed for each address that could be sending
 * to us.  Mostly for partially-received split packets.
 */
struct Incoming {
<------>struct sk_buff *skb;	/* packet data buffer             */
<------>__be16 sequence;	/* sequence number of assembly    */
<------>uint8_t lastpacket,	/* number of last packet (from 1) */
<------><------>numpackets;	/* number of packets in split     */
};
 
/* only needed for RFC1201 */
struct Outgoing {
<------>struct ArcProto *proto;	/* protocol driver that owns this:
<------><------><------><------> *   if NULL, no packet is pending.
<------><------><------><------> */
<------>struct sk_buff *skb;	/* buffer from upper levels */
<------>struct archdr *pkt;	/* a pointer into the skb */
<------>uint16_t length,	/* bytes total */
<------><------>dataleft,	/* bytes left */
<------><------>segnum,		/* segment being sent */
<------><------>numsegs;	/* number of segments */
};
 
#define ARCNET_LED_NAME_SZ (IFNAMSIZ + 6)
 
struct arcnet_local {
<------>uint8_t config,		/* current value of CONFIG register */
<------><------>timeout,	/* Extended timeout for COM20020 */
<------><------>backplane,	/* Backplane flag for COM20020 */
<------><------>clockp,		/* COM20020 clock divider */
<------><------>clockm,		/* COM20020 clock multiplier flag */
<------><------>setup,		/* Contents of setup1 register */
<------><------>setup2,		/* Contents of setup2 register */
<------><------>intmask;	/* current value of INTMASK register */
<------>uint8_t default_proto[256];	/* default encap to use for each host */
<------>int	cur_tx,		/* buffer used by current transmit, or -1 */
<------><------>next_tx,	/* buffer where a packet is ready to send */
<------><------>cur_rx;		/* current receive buffer */
<------>int	lastload_dest,	/* can last loaded packet be acked? */
<------><------>lasttrans_dest;	/* can last TX'd packet be acked? */
<------>int	timed_out;	/* need to process TX timeout and drop packet */
<------>unsigned long last_timeout;	/* time of last reported timeout */
<------>char *card_name;	/* card ident string */
<------>int card_flags;		/* special card features */
 
<------>/* On preemtive and SMB a lock is needed */
<------>spinlock_t lock;
 
<------>struct led_trigger *tx_led_trig;
<------>char tx_led_trig_name[ARCNET_LED_NAME_SZ];
<------>struct led_trigger *recon_led_trig;
<------>char recon_led_trig_name[ARCNET_LED_NAME_SZ];
 
<------>struct timer_list	timer;
 
<------>struct net_device *dev;
<------>int reply_status;
<------>struct tasklet_struct reply_tasklet;
 
<------>/*
<------> * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of
<------> * which can be used for either sending or receiving.  The new dynamic
<------> * buffer management routines use a simple circular queue of available
<------> * buffers, and take them as they're needed.  This way, we simplify
<------> * situations in which we (for example) want to pre-load a transmit
<------> * buffer, or start receiving while we copy a received packet to
<------> * memory.
<------> *
<------> * The rules: only the interrupt handler is allowed to _add_ buffers to
<------> * the queue; thus, this doesn't require a lock.  Both the interrupt
<------> * handler and the transmit function will want to _remove_ buffers, so
<------> * we need to handle the situation where they try to do it at the same
<------> * time.
<------> *
<------> * If next_buf == first_free_buf, the queue is empty.  Since there are
<------> * only four possible buffers, the queue should never be full.
<------> */
<------>atomic_t buf_lock;
<------>int buf_queue[5];
<------>int next_buf, first_free_buf;
 
<------>/* network "reconfiguration" handling */
<------>unsigned long first_recon; /* time of "first" RECON message to count */
<------>unsigned long last_recon;  /* time of most recent RECON */
<------>int num_recons;		/* number of RECONs between first and last. */
<------>int network_down;	/* do we think the network is down? */
 
<------>int excnak_pending;    /* We just got an excesive nak interrupt */
 
<------>struct {
<------><------>uint16_t sequence;	/* sequence number (incs with each packet) */
<------><------>__be16 aborted_seq;
 
<------><------>struct Incoming incoming[256];	/* one from each address */
<------>} rfc1201;
 
<------>/* really only used by rfc1201, but we'll pretend it's not */
<------>struct Outgoing outgoing;	/* packet currently being sent */
 
<------>/* hardware-specific functions */
<------>struct {
<------><------>struct module *owner;
<------><------>void (*command)(struct net_device *dev, int cmd);
<------><------>int (*status)(struct net_device *dev);
<------><------>void (*intmask)(struct net_device *dev, int mask);
<------><------>int (*reset)(struct net_device *dev, int really_reset);
<------><------>void (*open)(struct net_device *dev);
<------><------>void (*close)(struct net_device *dev);
<------><------>void (*datatrigger) (struct net_device * dev, int enable);
<------><------>void (*recontrigger) (struct net_device * dev, int enable);
 
<------><------>void (*copy_to_card)(struct net_device *dev, int bufnum,
<------><------><------><------>     int offset, void *buf, int count);
<------><------>void (*copy_from_card)(struct net_device *dev, int bufnum,
<------><------><------><------>       int offset, void *buf, int count);
<------>} hw;
 
<------>void __iomem *mem_start;	/* pointer to ioremap'ed MMIO */
};
 
enum arcnet_led_event {
<------>ARCNET_LED_EVENT_RECON,
<------>ARCNET_LED_EVENT_OPEN,
<------>ARCNET_LED_EVENT_STOP,
<------>ARCNET_LED_EVENT_TX,
};
 
void arcnet_led_event(struct net_device *netdev, enum arcnet_led_event event);
void devm_arcnet_led_init(struct net_device *netdev, int index, int subid);
 
#if ARCNET_DEBUG_MAX & D_SKB
void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc);
#else
static inline
void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc)
{
}
#endif
 
void arcnet_unregister_proto(struct ArcProto *proto);
irqreturn_t arcnet_interrupt(int irq, void *dev_id);
struct net_device *alloc_arcdev(const char *name);
 
int arcnet_open(struct net_device *dev);
int arcnet_close(struct net_device *dev);
netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
<------><------><------>       struct net_device *dev);
void arcnet_timeout(struct net_device *dev, unsigned int txqueue);
 
/* I/O equivalents */
 
#ifdef CONFIG_SA1100_CT6001
#define BUS_ALIGN  2  /* 8 bit device on a 16 bit bus - needs padding */
#else
#define BUS_ALIGN  1
#endif
 
/* addr and offset allow register like names to define the actual IO  address.
 * A configuration option multiplies the offset for alignment.
 */
#define arcnet_inb(addr, offset)					\
<------>inb((addr) + BUS_ALIGN * (offset))
#define arcnet_outb(value, addr, offset)				\
<------>outb(value, (addr) + BUS_ALIGN * (offset))
 
#define arcnet_insb(addr, offset, buffer, count)			\
<------>insb((addr) + BUS_ALIGN * (offset), buffer, count)
#define arcnet_outsb(addr, offset, buffer, count)			\
<------>outsb((addr) + BUS_ALIGN * (offset), buffer, count)
 
#define arcnet_readb(addr, offset)					\
<------>readb((addr) + (offset))
#define arcnet_writeb(value, addr, offset)				\
<------>writeb(value, (addr) + (offset))
 
#endif				/* __KERNEL__ */
#endif				/* _LINUX_ARCDEVICE_H */

	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* INET An implementation of the TCP/IP protocol suite for the LINUX
	* operating system. NET is implemented using the BSD Socket
	* interface as the means of communication with the user level.
	*
	* Definitions used by the ARCnet driver.
	*
	* Authors: Avery Pennarun and David Woodhouse
	*/
	#ifndef _LINUX_ARCDEVICE_H
	#define _LINUX_ARCDEVICE_H

	#include <asm/timex.h>
	#include <linux/if_arcnet.h>

	#ifdef __KERNEL__
	#include <linux/interrupt.h>

	/*
	* RECON_THRESHOLD is the maximum number of RECON messages to receive
	* within one minute before printing a "cabling problem" warning. The
	* default value should be fine.
	*
	* After that, a "cabling restored" message will be printed on the next IRQ
	* if no RECON messages have been received for 10 seconds.
	*
	* Do not define RECON_THRESHOLD at all if you want to disable this feature.
	*/
	#define RECON_THRESHOLD 30

	/*
	* Define this to the minimum "timeout" value. If a transmit takes longer
	* than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large
	* network, or one with heavy network traffic, this timeout may need to be
	* increased. The larger it is, though, the longer it will be between
	* necessary transmits - don't set this too high.
	*/
	#define TX_TIMEOUT (HZ * 200 / 1000)

	/* Display warnings about the driver being an ALPHA version. */
	#undef ALPHA_WARNING

	/*
	* Debugging bitflags: each option can be enabled individually.
	*
	* Note: only debug flags included in the ARCNET_DEBUG_MAX define will
	* actually be available. GCC will (at least, GCC 2.7.0 will) notice
	* lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize
	* them out.
	*/
	#define D_NORMAL 1 /* important operational info */
	#define D_EXTRA 2 /* useful, but non-vital information */
	#define D_INIT 4 /* show init/probe messages */
	#define D_INIT_REASONS 8 /* show reasons for discarding probes */
	#define D_RECON 32 /* print a message whenever token is lost */
	#define D_PROTO 64 /* debug auto-protocol support */
	/* debug levels below give LOTS of output during normal operation! */
	#define D_DURING 128 /* trace operations (including irq's) */
	#define D_TX 256 /* show tx packets */
	#define D_RX 512 /* show rx packets */
	#define D_SKB 1024 /* show skb's */
	#define D_SKB_SIZE 2048 /* show skb sizes */
	#define D_TIMING 4096 /* show time needed to copy buffers to card */
	#define D_DEBUG 8192 /* Very detailed debug line for line */

	#ifndef ARCNET_DEBUG_MAX
	#define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */
	#endif

	#ifndef ARCNET_DEBUG
	#define ARCNET_DEBUG (D_NORMAL \| D_EXTRA)
	#endif
	extern int arcnet_debug;

	#define BUGLVL(x) ((x) & ARCNET_DEBUG_MAX & arcnet_debug)

	/* macros to simplify debug checking */
	#define arc_printk(x, dev, fmt, ...) \
	do { \
	<------>if (BUGLVL(x)) { \
	<------><------>if ((x) == D_NORMAL) \
	<------><------><------>netdev_warn(dev, fmt, ##__VA_ARGS__); \
	<------><------>else if ((x) < D_DURING) \
	<------><------><------>netdev_info(dev, fmt, ##__VA_ARGS__); \
	<------><------>else \
	<------><------><------>netdev_dbg(dev, fmt, ##__VA_ARGS__); \
	<------>} \
	} while (0)

	#define arc_cont(x, fmt, ...) \
	do { \
	<------>if (BUGLVL(x)) \
	<------><------>pr_cont(fmt, ##__VA_ARGS__); \
	} while (0)

	/* see how long a function call takes to run, expressed in CPU cycles */
	#define TIME(dev, name, bytes, call) \
	do { \
	<------>if (BUGLVL(D_TIMING)) { \
	<------><------>unsigned long _x, _y; \
	<------><------>_x = get_cycles(); \
	<------><------>call; \
	<------><------>_y = get_cycles(); \
	<------><------>arc_printk(D_TIMING, dev, \
	<------><------><------> "%s: %d bytes in %lu cycles == %lu Kbytes/100Mcycle\n", \
	<------><------><------> name, bytes, _y - _x, \
	<------><------><------> 100000000 / 1024 * bytes / (_y - _x + 1)); \
	<------>} else { \
	<------><------>call; \
	<------>} \
	} while (0)

	/*
	* Time needed to reset the card - in ms (milliseconds). This works on my
	* SMC PC100. I can't find a reference that tells me just how long I
	* should wait.
	*/
	#define RESETtime (300)

	/*
	* These are the max/min lengths of packet payload, not including the
	* arc_hardware header, but definitely including the soft header.
	*
	* Note: packet sizes 254, 255, 256 are impossible because of the way
	* ARCnet registers work That's why RFC1201 defines "exception" packets.
	* In non-RFC1201 protocols, we have to just tack some extra bytes on the
	* end.
	*/
	#define MTU 253 /* normal packet max size */
	#define MinTU 257 /* extended packet min size */
	#define XMTU 508 /* extended packet max size */

	/* status/interrupt mask bit fields */
	#define TXFREEflag 0x01 /* transmitter available */
	#define TXACKflag 0x02 /* transmitted msg. ackd */
	#define RECONflag 0x04 /* network reconfigured */
	#define TESTflag 0x08 /* test flag */
	#define EXCNAKflag 0x08 /* excesive nak flag */
	#define RESETflag 0x10 /* power-on-reset */
	#define RES1flag 0x20 /* reserved - usually set by jumper */
	#define RES2flag 0x40 /* reserved - usually set by jumper */
	#define NORXflag 0x80 /* receiver inhibited */

	/* Flags used for IO-mapped memory operations */
	#define AUTOINCflag 0x40 /* Increase location with each access */
	#define IOMAPflag 0x02 /* (for 90xx) Use IO mapped memory, not mmap */
	#define ENABLE16flag 0x80 /* (for 90xx) Enable 16-bit mode */

	/* in the command register, the following bits have these meanings:
	* 0-2 command
	* 3-4 page number (for enable rcv/xmt command)
	* 7 receive broadcasts
	*/
	#define NOTXcmd 0x01 /* disable transmitter */
	#define NORXcmd 0x02 /* disable receiver */
	#define TXcmd 0x03 /* enable transmitter */
	#define RXcmd 0x04 /* enable receiver */
	#define CONFIGcmd 0x05 /* define configuration */
	#define CFLAGScmd 0x06 /* clear flags */
	#define TESTcmd 0x07 /* load test flags */
	#define STARTIOcmd 0x18 /* start internal operation */

	/* flags for "clear flags" command */
	#define RESETclear 0x08 /* power-on-reset */
	#define CONFIGclear 0x10 /* system reconfigured */

	#define EXCNAKclear 0x0E /* Clear and acknowledge the excive nak bit */

	/* flags for "load test flags" command */
	#define TESTload 0x08 /* test flag (diagnostic) */

	/* byte deposited into first address of buffers on reset */
	#define TESTvalue 0321 /* that's octal for 0xD1 :) */

	/* for "enable receiver" command */
	#define RXbcasts 0x80 /* receive broadcasts */

	/* flags for "define configuration" command */
	#define NORMALconf 0x00 /* 1-249 byte packets */
	#define EXTconf 0x08 /* 250-504 byte packets */

	/* card feature flags, set during auto-detection.
	* (currently only used by com20020pci)
	*/
	#define ARC_IS_5MBIT 1 /* card default speed is 5MBit */
	#define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit,
	<------><------><------><------> but default is 2.5MBit. */

	/* information needed to define an encapsulation driver */
	struct ArcProto {
	<------>char suffix; /* a for RFC1201, e for ether-encap, etc. */
	<------>int mtu; /* largest possible packet */
	<------>int is_ip; /* This is a ip plugin - not a raw thing */

	<------>void (rx)(struct net_device dev, int bufnum,
	<------><------> struct archdr *pkthdr, int length);
	<------>int (build_header)(struct sk_buff skb, struct net_device *dev,
	<------><------><------> unsigned short ethproto, uint8_t daddr);

	<------>/* these functions return '1' if the skb can now be freed */
	<------>int (prepare_tx)(struct net_device dev, struct archdr *pkt,
	<------><------><------> int length, int bufnum);
	<------>int (continue_tx)(struct net_device dev, int bufnum);
	<------>int (ack_tx)(struct net_device dev, int acked);
	};

	extern struct ArcProto arc_proto_map[256], arc_proto_default,
	<------>arc_bcast_proto, arc_raw_proto;

	/*
	* "Incoming" is information needed for each address that could be sending
	* to us. Mostly for partially-received split packets.
	*/
	struct Incoming {
	<------>struct sk_buff skb; / packet data buffer */
	<------>__be16 sequence; /* sequence number of assembly */
	<------>uint8_t lastpacket, /* number of last packet (from 1) */
	<------><------>numpackets; /* number of packets in split */
	};

	/* only needed for RFC1201 */
	struct Outgoing {
	<------>struct ArcProto proto; / protocol driver that owns this:
	<------><------><------><------> * if NULL, no packet is pending.
	<------><------><------><------> */
	<------>struct sk_buff skb; / buffer from upper levels */
	<------>struct archdr pkt; / a pointer into the skb */
	<------>uint16_t length, /* bytes total */
	<------><------>dataleft, /* bytes left */
	<------><------>segnum, /* segment being sent */
	<------><------>numsegs; /* number of segments */
	};

	#define ARCNET_LED_NAME_SZ (IFNAMSIZ + 6)

	struct arcnet_local {
	<------>uint8_t config, /* current value of CONFIG register */
	<------><------>timeout, /* Extended timeout for COM20020 */
	<------><------>backplane, /* Backplane flag for COM20020 */
	<------><------>clockp, /* COM20020 clock divider */
	<------><------>clockm, /* COM20020 clock multiplier flag */
	<------><------>setup, /* Contents of setup1 register */
	<------><------>setup2, /* Contents of setup2 register */
	<------><------>intmask; /* current value of INTMASK register */
	<------>uint8_t default_proto[256]; /* default encap to use for each host */
	<------>int cur_tx, /* buffer used by current transmit, or -1 */
	<------><------>next_tx, /* buffer where a packet is ready to send */
	<------><------>cur_rx; /* current receive buffer */
	<------>int lastload_dest, /* can last loaded packet be acked? */
	<------><------>lasttrans_dest; /* can last TX'd packet be acked? */
	<------>int timed_out; /* need to process TX timeout and drop packet */
	<------>unsigned long last_timeout; /* time of last reported timeout */
	<------>char card_name; / card ident string */
	<------>int card_flags; /* special card features */

	<------>/* On preemtive and SMB a lock is needed */
	<------>spinlock_t lock;

	<------>struct led_trigger *tx_led_trig;
	<------>char tx_led_trig_name[ARCNET_LED_NAME_SZ];
	<------>struct led_trigger *recon_led_trig;
	<------>char recon_led_trig_name[ARCNET_LED_NAME_SZ];

	<------>struct timer_list timer;

	<------>struct net_device *dev;
	<------>int reply_status;
	<------>struct tasklet_struct reply_tasklet;

	<------>/*
	<------> * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of
	<------> * which can be used for either sending or receiving. The new dynamic
	<------> * buffer management routines use a simple circular queue of available
	<------> * buffers, and take them as they're needed. This way, we simplify
	<------> * situations in which we (for example) want to pre-load a transmit
	<------> * buffer, or start receiving while we copy a received packet to
	<------> * memory.
	<------> *
	<------> * The rules: only the interrupt handler is allowed to _add_ buffers to
	<------> * the queue; thus, this doesn't require a lock. Both the interrupt
	<------> * handler and the transmit function will want to _remove_ buffers, so
	<------> * we need to handle the situation where they try to do it at the same
	<------> * time.
	<------> *
	<------> * If next_buf == first_free_buf, the queue is empty. Since there are
	<------> * only four possible buffers, the queue should never be full.
	<------> */
	<------>atomic_t buf_lock;
	<------>int buf_queue[5];
	<------>int next_buf, first_free_buf;

	<------>/* network "reconfiguration" handling */
	<------>unsigned long first_recon; /* time of "first" RECON message to count */
	<------>unsigned long last_recon; /* time of most recent RECON */
	<------>int num_recons; /* number of RECONs between first and last. */
	<------>int network_down; /* do we think the network is down? */

	<------>int excnak_pending; /* We just got an excesive nak interrupt */

	<------>struct {
	<------><------>uint16_t sequence; /* sequence number (incs with each packet) */
	<------><------>__be16 aborted_seq;

	<------><------>struct Incoming incoming[256]; /* one from each address */
	<------>} rfc1201;

	<------>/* really only used by rfc1201, but we'll pretend it's not */
	<------>struct Outgoing outgoing; /* packet currently being sent */

	<------>/* hardware-specific functions */
	<------>struct {
	<------><------>struct module *owner;
	<------><------>void (command)(struct net_device dev, int cmd);
	<------><------>int (status)(struct net_device dev);
	<------><------>void (intmask)(struct net_device dev, int mask);
	<------><------>int (reset)(struct net_device dev, int really_reset);
	<------><------>void (open)(struct net_device dev);
	<------><------>void (close)(struct net_device dev);
	<------><------>void (datatrigger) (struct net_device dev, int enable);
	<------><------>void (recontrigger) (struct net_device dev, int enable);

	<------><------>void (copy_to_card)(struct net_device dev, int bufnum,
	<------><------><------><------> int offset, void *buf, int count);
	<------><------>void (copy_from_card)(struct net_device dev, int bufnum,
	<------><------><------><------> int offset, void *buf, int count);
	<------>} hw;

	<------>void __iomem mem_start; / pointer to ioremap'ed MMIO */
	};

	enum arcnet_led_event {
	<------>ARCNET_LED_EVENT_RECON,
	<------>ARCNET_LED_EVENT_OPEN,
	<------>ARCNET_LED_EVENT_STOP,
	<------>ARCNET_LED_EVENT_TX,
	};

	void arcnet_led_event(struct net_device *netdev, enum arcnet_led_event event);
	void devm_arcnet_led_init(struct net_device *netdev, int index, int subid);

	#if ARCNET_DEBUG_MAX & D_SKB
	void arcnet_dump_skb(struct net_device dev, struct sk_buff skb, char *desc);
	#else
	static inline
	void arcnet_dump_skb(struct net_device dev, struct sk_buff skb, char *desc)
	{
	}
	#endif

	void arcnet_unregister_proto(struct ArcProto *proto);
	irqreturn_t arcnet_interrupt(int irq, void *dev_id);
	struct net_device alloc_arcdev(const char name);

	int arcnet_open(struct net_device *dev);
	int arcnet_close(struct net_device *dev);
	netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
	<------><------><------> struct net_device *dev);
	void arcnet_timeout(struct net_device *dev, unsigned int txqueue);

	/* I/O equivalents */

	#ifdef CONFIG_SA1100_CT6001
	#define BUS_ALIGN 2 /* 8 bit device on a 16 bit bus - needs padding */
	#else
	#define BUS_ALIGN 1
	#endif

	/* addr and offset allow register like names to define the actual IO address.
	* A configuration option multiplies the offset for alignment.
	*/
	#define arcnet_inb(addr, offset) \
	<------>inb((addr) + BUS_ALIGN * (offset))
	#define arcnet_outb(value, addr, offset) \
	<------>outb(value, (addr) + BUS_ALIGN * (offset))

	#define arcnet_insb(addr, offset, buffer, count) \
	<------>insb((addr) + BUS_ALIGN * (offset), buffer, count)
	#define arcnet_outsb(addr, offset, buffer, count) \
	<------>outsb((addr) + BUS_ALIGN * (offset), buffer, count)

	#define arcnet_readb(addr, offset) \
	<------>readb((addr) + (offset))
	#define arcnet_writeb(value, addr, offset) \
	<------>writeb(value, (addr) + (offset))

	#endif /* __KERNEL__ */
	#endif /* _LINUX_ARCDEVICE_H */