aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/arcdevice.h
blob: cd4bcb6989ce0e888d7e62f1e771c18e9b2f404e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
 * 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             */
	__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. */
	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) */
		__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);
		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(const char *name);

int arcnet_open(struct net_device *dev);
int arcnet_close(struct net_device *dev);
int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
void arcnet_timeout(struct net_device *dev);

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