[linux-2.6-block.git] / include / linux / arcdevice.h

/*
 * 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
 *
 *              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 of the License, or (at your option) any later version.
 *
 */
#ifndef _LINUX_ARCDEVICE_H
#define _LINUX_ARCDEVICE_H

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

#ifdef __KERNEL__
#include  <linux/irqreturn.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;

/* macros to simplify debug checking */
#define BUGLVL(x) if ((ARCNET_DEBUG_MAX)&arcnet_debug&(x))
#define BUGMSG2(x,msg,args...) do { BUGLVL(x) printk(msg, ## args); } while (0)
#define BUGMSG(x,msg,args...) \
	BUGMSG2(x, "%s%6s: " msg, \
            x==D_NORMAL	? KERN_WARNING \
            		: x < D_DURING ? KERN_INFO : KERN_DEBUG, \
	    dev->name , ## args)

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


/*
 * 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 */

/* 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 */
};


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;

	/*
	 * 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 (*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 */
};


#define ARCRESET(x)  (lp->hw.reset(dev, (x)))
#define ACOMMAND(x)  (lp->hw.command(dev, (x)))
#define ASTATUS()    (lp->hw.status(dev))
#define AINTMASK(x)  (lp->hw.intmask(dev, (x)))


#if ARCNET_DEBUG_MAX & D_SKB
void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc);
#else
#define arcnet_dump_skb(dev,skb,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);

#endif				/* __KERNEL__ */
#endif				/* _LINUX_ARCDEVICE_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. NET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions used by the ARCnet driver.
	7	*
	8	* Authors: Avery Pennarun and David Woodhouse
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*
	15	*/
	16	#ifndef _LINUX_ARCDEVICE_H
	17	#define _LINUX_ARCDEVICE_H
	18
	19	#include <asm/timex.h>
	20	#include <linux/if_arcnet.h>
	21
	22	#ifdef __KERNEL__
a6b7a407	23	#include <linux/irqreturn.h>
1da177e4	24
1da177e4 LT	25	/*
	26	* RECON_THRESHOLD is the maximum number of RECON messages to receive
	27	* within one minute before printing a "cabling problem" warning. The
	28	* default value should be fine.
	29	*
	30	* After that, a "cabling restored" message will be printed on the next IRQ
	31	* if no RECON messages have been received for 10 seconds.
	32	*
	33	* Do not define RECON_THRESHOLD at all if you want to disable this feature.
	34	*/
	35	#define RECON_THRESHOLD 30
	36
	37
	38	/*
	39	* Define this to the minimum "timeout" value. If a transmit takes longer
	40	* than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large
	41	* network, or one with heavy network traffic, this timeout may need to be
	42	* increased. The larger it is, though, the longer it will be between
	43	* necessary transmits - don't set this too high.
	44	*/
	45	#define TX_TIMEOUT (HZ * 200 / 1000)
	46
	47
	48	/* Display warnings about the driver being an ALPHA version. */
	49	#undef ALPHA_WARNING
	50
	51
	52	/*
	53	* Debugging bitflags: each option can be enabled individually.
	54	*
	55	* Note: only debug flags included in the ARCNET_DEBUG_MAX define will
	56	* actually be available. GCC will (at least, GCC 2.7.0 will) notice
	57	* lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize
	58	* them out.
	59	*/
	60	#define D_NORMAL 1 /* important operational info */
	61	#define D_EXTRA 2 /* useful, but non-vital information */
	62	#define D_INIT 4 /* show init/probe messages */
	63	#define D_INIT_REASONS 8 /* show reasons for discarding probes */
	64	#define D_RECON 32 /* print a message whenever token is lost */
	65	#define D_PROTO 64 /* debug auto-protocol support */
	66	/* debug levels below give LOTS of output during normal operation! */
	67	#define D_DURING 128 /* trace operations (including irq's) */
	68	#define D_TX 256 /* show tx packets */
	69	#define D_RX 512 /* show rx packets */
	70	#define D_SKB 1024 /* show skb's */
	71	#define D_SKB_SIZE 2048 /* show skb sizes */
	72	#define D_TIMING 4096 /* show time needed to copy buffers to card */
	73	#define D_DEBUG 8192 /* Very detailed debug line for line */
	74
	75	#ifndef ARCNET_DEBUG_MAX
	76	#define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */
	77	#endif
	78
	79	#ifndef ARCNET_DEBUG
	80	#define ARCNET_DEBUG (D_NORMAL\|D_EXTRA)
	81	#endif
	82	extern int arcnet_debug;
	83
	84	/* macros to simplify debug checking */
	85	#define BUGLVL(x) if ((ARCNET_DEBUG_MAX)&arcnet_debug&(x))
	86	#define BUGMSG2(x,msg,args...) do { BUGLVL(x) printk(msg, ## args); } while (0)
	87	#define BUGMSG(x,msg,args...) \
	88	BUGMSG2(x, "%s%6s: " msg, \
89	x==D_NORMAL ? KERN_WARNING \
90	: x < D_DURING ? KERN_INFO : KERN_DEBUG, \
91	dev->name , ## args)
92
93	/* see how long a function call takes to run, expressed in CPU cycles */
94	#define TIME(name, bytes, call) BUGLVL(D_TIMING) { \
95	unsigned long _x, _y; \
96	_x = get_cycles(); \
97	call; \
98	_y = get_cycles(); \
99	BUGMSG(D_TIMING, \
100	"%s: %d bytes in %lu cycles == " \
101	"%lu Kbytes/100Mcycle\n",\
102	name, bytes, _y - _x, \
103	100000000 / 1024 * bytes / (_y - _x + 1));\
104	} \
105	else { \
106	call;\
107	}
108
109
110	/*
111	* Time needed to reset the card - in ms (milliseconds). This works on my
112	* SMC PC100. I can't find a reference that tells me just how long I
113	* should wait.
114	*/
115	#define RESETtime (300)
116
117	/*
118	* These are the max/min lengths of packet payload, not including the
119	* arc_hardware header, but definitely including the soft header.
120	*
121	* Note: packet sizes 254, 255, 256 are impossible because of the way
122	* ARCnet registers work That's why RFC1201 defines "exception" packets.
123	* In non-RFC1201 protocols, we have to just tack some extra bytes on the
124	* end.
125	*/
126	#define MTU 253 /* normal packet max size */
127	#define MinTU 257 /* extended packet min size */
128	#define XMTU 508 /* extended packet max size */
129
130	/* status/interrupt mask bit fields */
131	#define TXFREEflag 0x01 /* transmitter available */
132	#define TXACKflag 0x02 /* transmitted msg. ackd */
133	#define RECONflag 0x04 /* network reconfigured */
134	#define TESTflag 0x08 /* test flag */
135	#define EXCNAKflag 0x08 /* excesive nak flag */
136	#define RESETflag 0x10 /* power-on-reset */
137	#define RES1flag 0x20 /* reserved - usually set by jumper */
138	#define RES2flag 0x40 /* reserved - usually set by jumper */
139	#define NORXflag 0x80 /* receiver inhibited */
140
141	/* Flags used for IO-mapped memory operations */
142	#define AUTOINCflag 0x40 /* Increase location with each access */
143	#define IOMAPflag 0x02 /* (for 90xx) Use IO mapped memory, not mmap */
144	#define ENABLE16flag 0x80 /* (for 90xx) Enable 16-bit mode */
145
146	/* in the command register, the following bits have these meanings:
147	* 0-2 command
148	* 3-4 page number (for enable rcv/xmt command)
149	* 7 receive broadcasts
150	*/
151	#define NOTXcmd 0x01 /* disable transmitter */
152	#define NORXcmd 0x02 /* disable receiver */
153	#define TXcmd 0x03 /* enable transmitter */
154	#define RXcmd 0x04 /* enable receiver */
155	#define CONFIGcmd 0x05 /* define configuration */
156	#define CFLAGScmd 0x06 /* clear flags */
157	#define TESTcmd 0x07 /* load test flags */
158
159	/* flags for "clear flags" command */
160	#define RESETclear 0x08 /* power-on-reset */
161	#define CONFIGclear 0x10 /* system reconfigured */
162
163	#define EXCNAKclear 0x0E /* Clear and acknowledge the excive nak bit */
164
165	/* flags for "load test flags" command */
166	#define TESTload 0x08 /* test flag (diagnostic) */
167
168	/* byte deposited into first address of buffers on reset */
169	#define TESTvalue 0321 /* that's octal for 0xD1 :) */
170
171	/* for "enable receiver" command */
172	#define RXbcasts 0x80 /* receive broadcasts */
173
174	/* flags for "define configuration" command */
175	#define NORMALconf 0x00 /* 1-249 byte packets */
176	#define EXTconf 0x08 /* 250-504 byte packets */
177
178	/* card feature flags, set during auto-detection.
179	* (currently only used by com20020pci)
180	*/
181	#define ARC_IS_5MBIT 1 /* card default speed is 5MBit */
182	#define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit,
183	but default is 2.5MBit. */
184
185
186	/* information needed to define an encapsulation driver */
187	struct ArcProto {
188	char suffix; /* a for RFC1201, e for ether-encap, etc. */
189	int mtu; /* largest possible packet */
190	int is_ip; /* This is a ip plugin - not a raw thing */
191
192	void (rx) (struct net_device dev, int bufnum,
193	struct archdr * pkthdr, int length);
194	int (build_header) (struct sk_buff skb, struct net_device *dev,
195	unsigned short ethproto, uint8_t daddr);
196
197	/* these functions return '1' if the skb can now be freed */
198	int (prepare_tx) (struct net_device dev, struct archdr * pkt, int length,
199	int bufnum);
200	int (continue_tx) (struct net_device dev, int bufnum);
201	int (ack_tx) (struct net_device dev, int acked);
202	};
203
204	extern struct ArcProto arc_proto_map[256], arc_proto_default,
205	arc_bcast_proto, arc_raw_proto;
1da177e4 LT	206
	207
	208	/*
	209	* "Incoming" is information needed for each address that could be sending
	210	* to us. Mostly for partially-received split packets.
	211	*/
	212	struct Incoming {
	213	struct sk_buff skb; / packet data buffer */
701181ac	214	__be16 sequence; /* sequence number of assembly */
1da177e4 LT	215	uint8_t lastpacket, /* number of last packet (from 1) */
	216	numpackets; /* number of packets in split */
	217	};
	218
	219
	220	/* only needed for RFC1201 */
	221	struct Outgoing {
	222	struct ArcProto proto; / protocol driver that owns this:
	223	* if NULL, no packet is pending.
	224	*/
	225	struct sk_buff skb; / buffer from upper levels */
	226	struct archdr pkt; / a pointer into the skb */
	227	uint16_t length, /* bytes total */
	228	dataleft, /* bytes left */
	229	segnum, /* segment being sent */
	230	numsegs; /* number of segments */
	231	};
	232
	233
	234	struct arcnet_local {
1da177e4 LT	235	uint8_t config, /* current value of CONFIG register */
	236	timeout, /* Extended timeout for COM20020 */
	237	backplane, /* Backplane flag for COM20020 */
	238	clockp, /* COM20020 clock divider */
	239	clockm, /* COM20020 clock multiplier flag */
	240	setup, /* Contents of setup1 register */
	241	setup2, /* Contents of setup2 register */
	242	intmask; /* current value of INTMASK register */
	243	uint8_t default_proto[256]; /* default encap to use for each host */
	244	int cur_tx, /* buffer used by current transmit, or -1 */
	245	next_tx, /* buffer where a packet is ready to send */
	246	cur_rx; /* current receive buffer */
	247	int lastload_dest, /* can last loaded packet be acked? */
	248	lasttrans_dest; /* can last TX'd packet be acked? */
	249	int timed_out; /* need to process TX timeout and drop packet */
	250	unsigned long last_timeout; /* time of last reported timeout */
	251	char card_name; / card ident string */
	252	int card_flags; /* special card features */
	253
	254
	255	/* On preemtive and SMB a lock is needed */
	256	spinlock_t lock;
	257
	258	/*
	259	* Buffer management: an ARCnet card has 4 x 512-byte buffers, each of
	260	* which can be used for either sending or receiving. The new dynamic
	261	* buffer management routines use a simple circular queue of available
	262	* buffers, and take them as they're needed. This way, we simplify
	263	* situations in which we (for example) want to pre-load a transmit
	264	* buffer, or start receiving while we copy a received packet to
	265	* memory.
	266	*
	267	* The rules: only the interrupt handler is allowed to _add_ buffers to
	268	* the queue; thus, this doesn't require a lock. Both the interrupt
	269	* handler and the transmit function will want to _remove_ buffers, so
	270	* we need to handle the situation where they try to do it at the same
	271	* time.
	272	*
	273	* If next_buf == first_free_buf, the queue is empty. Since there are
	274	* only four possible buffers, the queue should never be full.
	275	*/
	276	atomic_t buf_lock;
	277	int buf_queue[5];
	278	int next_buf, first_free_buf;
	279
	280	/* network "reconfiguration" handling */
9307b570 CO	281	unsigned long first_recon; /* time of "first" RECON message to count */
9307b570 CO	282	unsigned long last_recon; /* time of most recent RECON */
1da177e4	283	int num_recons; /* number of RECONs between first and last. */
db55b62c	284	int network_down; /* do we think the network is down? */
1da177e4	285
db55b62c	286	int excnak_pending; /* We just got an excesive nak interrupt */
1da177e4 LT	287
	288	struct {
	289	uint16_t sequence; /* sequence number (incs with each packet) */
701181ac	290	__be16 aborted_seq;
1da177e4 LT	291
	292	struct Incoming incoming[256]; /* one from each address */
	293	} rfc1201;
	294
	295	/* really only used by rfc1201, but we'll pretend it's not */
	296	struct Outgoing outgoing; /* packet currently being sent */
	297
	298	/* hardware-specific functions */
	299	struct {
	300	struct module *owner;
	301	void (command) (struct net_device dev, int cmd);
	302	int (status) (struct net_device dev);
	303	void (intmask) (struct net_device dev, int mask);
db55b62c	304	int (reset) (struct net_device dev, int really_reset);
1da177e4 LT	305	void (open) (struct net_device dev);
	306	void (close) (struct net_device dev);
	307
	308	void (copy_to_card) (struct net_device dev, int bufnum, int offset,
	309	void *buf, int count);
	310	void (copy_from_card) (struct net_device dev, int bufnum, int offset,
	311	void *buf, int count);
	312	} hw;
	313
	314	void __iomem mem_start; / pointer to ioremap'ed MMIO */
	315	};
	316
	317
	318	#define ARCRESET(x) (lp->hw.reset(dev, (x)))
	319	#define ACOMMAND(x) (lp->hw.command(dev, (x)))
	320	#define ASTATUS() (lp->hw.status(dev))
	321	#define AINTMASK(x) (lp->hw.intmask(dev, (x)))
	322
	323
	324
	325	#if ARCNET_DEBUG_MAX & D_SKB
	326	void arcnet_dump_skb(struct net_device dev, struct sk_buff skb, char *desc);
	327	#else
	328	#define arcnet_dump_skb(dev,skb,desc) ;
	329	#endif
	330
1da177e4	331	void arcnet_unregister_proto(struct ArcProto *proto);
7d12e780	332	irqreturn_t arcnet_interrupt(int irq, void *dev_id);
bca5b893 SH	333	struct net_device alloc_arcdev(const char name);
	334
	335	int arcnet_open(struct net_device *dev);
	336	int arcnet_close(struct net_device *dev);
61357325 SH	337	netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
61357325 SH	338	struct net_device *dev);
bca5b893	339	void arcnet_timeout(struct net_device *dev);
1da177e4 LT	340
	341	#endif /* __KERNEL__ */
	342	#endif /* _LINUX_ARCDEVICE_H */