[linux.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__

#ifndef bool
#define bool int
#endif

/*
 * 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             */
	uint16_t 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 {
	struct net_device_stats stats;

	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 */
	time_t first_recon,	/* time of "first" RECON message to count */
		last_recon;	/* time of most recent RECON */
	int num_recons;		/* number of RECONs between first and last. */
	bool network_down;	/* do we think the network is down? */

	bool excnak_pending;    /* We just got an excesive nak interrupt */

	struct {
		uint16_t sequence;	/* sequence number (incs with each packet) */
		uint16_t 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);
		bool (*reset) (struct net_device * dev, bool 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(char *name);

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