projects/linux·blob da89fb16 · refs

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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#include <linux/irqreturn.h>
24
25#ifndef bool
26#define bool int
27#endif
28
29/*
30 * RECON_THRESHOLD is the maximum number of RECON messages to receive
31 * within one minute before printing a "cabling problem" warning. The
32 * default value should be fine.
33 *
34 * After that, a "cabling restored" message will be printed on the next IRQ
35 * if no RECON messages have been received for 10 seconds.
36 *
37 * Do not define RECON_THRESHOLD at all if you want to disable this feature.
38 */
39#define RECON_THRESHOLD 30
40
41
42/*
43 * Define this to the minimum "timeout" value. If a transmit takes longer
44 * than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large
45 * network, or one with heavy network traffic, this timeout may need to be
46 * increased. The larger it is, though, the longer it will be between
47 * necessary transmits - don't set this too high.
48 */
49#define TX_TIMEOUT (HZ * 200 / 1000)
50
51
52/* Display warnings about the driver being an ALPHA version. */
53#undef ALPHA_WARNING
54
55
56/*
57 * Debugging bitflags: each option can be enabled individually.
58 *
59 * Note: only debug flags included in the ARCNET_DEBUG_MAX define will
60 * actually be available. GCC will (at least, GCC 2.7.0 will) notice
61 * lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize
62 * them out.
63 */
64#define D_NORMAL 1 /* important operational info */
65#define D_EXTRA 2 /* useful, but non-vital information */
66#define D_INIT 4 /* show init/probe messages */
67#define D_INIT_REASONS 8 /* show reasons for discarding probes */
68#define D_RECON 32 /* print a message whenever token is lost */
69#define D_PROTO 64 /* debug auto-protocol support */
70/* debug levels below give LOTS of output during normal operation! */
71#define D_DURING 128 /* trace operations (including irq's) */
72#define D_TX 256 /* show tx packets */
73#define D_RX 512 /* show rx packets */
74#define D_SKB 1024 /* show skb's */
75#define D_SKB_SIZE 2048 /* show skb sizes */
76#define D_TIMING 4096 /* show time needed to copy buffers to card */
77#define D_DEBUG 8192 /* Very detailed debug line for line */
78
79#ifndef ARCNET_DEBUG_MAX
80#define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */
81#endif
82
83#ifndef ARCNET_DEBUG
84#define ARCNET_DEBUG (D_NORMAL|D_EXTRA)
85#endif
86extern int arcnet_debug;
87
88/* macros to simplify debug checking */
89#define BUGLVL(x) if ((ARCNET_DEBUG_MAX)&arcnet_debug&(x))
90#define BUGMSG2(x,msg,args...) do { BUGLVL(x) printk(msg, ## args); } while (0)
91#define BUGMSG(x,msg,args...) \
92 BUGMSG2(x, "%s%6s: " msg, \
93 x==D_NORMAL ? KERN_WARNING \
94 : x < D_DURING ? KERN_INFO : KERN_DEBUG, \
95 dev->name , ## args)
96
97/* see how long a function call takes to run, expressed in CPU cycles */
98#define TIME(name, bytes, call) BUGLVL(D_TIMING) { \
99 unsigned long _x, _y; \
100 _x = get_cycles(); \
101 call; \
102 _y = get_cycles(); \
103 BUGMSG(D_TIMING, \
104 "%s: %d bytes in %lu cycles == " \
105 "%lu Kbytes/100Mcycle\n",\
106 name, bytes, _y - _x, \
107 100000000 / 1024 * bytes / (_y - _x + 1));\
108 } \
109 else { \
110 call;\
111 }
112
113
114/*
115 * Time needed to reset the card - in ms (milliseconds). This works on my
116 * SMC PC100. I can't find a reference that tells me just how long I
117 * should wait.
118 */
119#define RESETtime (300)
120
121/*
122 * These are the max/min lengths of packet payload, not including the
123 * arc_hardware header, but definitely including the soft header.
124 *
125 * Note: packet sizes 254, 255, 256 are impossible because of the way
126 * ARCnet registers work That's why RFC1201 defines "exception" packets.
127 * In non-RFC1201 protocols, we have to just tack some extra bytes on the
128 * end.
129 */
130#define MTU 253 /* normal packet max size */
131#define MinTU 257 /* extended packet min size */
132#define XMTU 508 /* extended packet max size */
133
134/* status/interrupt mask bit fields */
135#define TXFREEflag 0x01 /* transmitter available */
136#define TXACKflag 0x02 /* transmitted msg. ackd */
137#define RECONflag 0x04 /* network reconfigured */
138#define TESTflag 0x08 /* test flag */
139#define EXCNAKflag 0x08 /* excesive nak flag */
140#define RESETflag 0x10 /* power-on-reset */
141#define RES1flag 0x20 /* reserved - usually set by jumper */
142#define RES2flag 0x40 /* reserved - usually set by jumper */
143#define NORXflag 0x80 /* receiver inhibited */
144
145/* Flags used for IO-mapped memory operations */
146#define AUTOINCflag 0x40 /* Increase location with each access */
147#define IOMAPflag 0x02 /* (for 90xx) Use IO mapped memory, not mmap */
148#define ENABLE16flag 0x80 /* (for 90xx) Enable 16-bit mode */
149
150/* in the command register, the following bits have these meanings:
151 * 0-2 command
152 * 3-4 page number (for enable rcv/xmt command)
153 * 7 receive broadcasts
154 */
155#define NOTXcmd 0x01 /* disable transmitter */
156#define NORXcmd 0x02 /* disable receiver */
157#define TXcmd 0x03 /* enable transmitter */
158#define RXcmd 0x04 /* enable receiver */
159#define CONFIGcmd 0x05 /* define configuration */
160#define CFLAGScmd 0x06 /* clear flags */
161#define TESTcmd 0x07 /* load test flags */
162
163/* flags for "clear flags" command */
164#define RESETclear 0x08 /* power-on-reset */
165#define CONFIGclear 0x10 /* system reconfigured */
166
167#define EXCNAKclear 0x0E /* Clear and acknowledge the excive nak bit */
168
169/* flags for "load test flags" command */
170#define TESTload 0x08 /* test flag (diagnostic) */
171
172/* byte deposited into first address of buffers on reset */
173#define TESTvalue 0321 /* that's octal for 0xD1 :) */
174
175/* for "enable receiver" command */
176#define RXbcasts 0x80 /* receive broadcasts */
177
178/* flags for "define configuration" command */
179#define NORMALconf 0x00 /* 1-249 byte packets */
180#define EXTconf 0x08 /* 250-504 byte packets */
181
182/* card feature flags, set during auto-detection.
183 * (currently only used by com20020pci)
184 */
185#define ARC_IS_5MBIT 1 /* card default speed is 5MBit */
186#define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit,
187 but default is 2.5MBit. */
188
189
190/* information needed to define an encapsulation driver */
191struct ArcProto {
192 char suffix; /* a for RFC1201, e for ether-encap, etc. */
193 int mtu; /* largest possible packet */
194 int is_ip; /* This is a ip plugin - not a raw thing */
195
196 void (*rx) (struct net_device * dev, int bufnum,
197 struct archdr * pkthdr, int length);
198 int (*build_header) (struct sk_buff * skb, struct net_device *dev,
199 unsigned short ethproto, uint8_t daddr);
200
201 /* these functions return '1' if the skb can now be freed */
202 int (*prepare_tx) (struct net_device * dev, struct archdr * pkt, int length,
203 int bufnum);
204 int (*continue_tx) (struct net_device * dev, int bufnum);
205 int (*ack_tx) (struct net_device * dev, int acked);
206};
207
208extern struct ArcProto *arc_proto_map[256], *arc_proto_default,
209 *arc_bcast_proto, *arc_raw_proto;
210
211
212/*
213 * "Incoming" is information needed for each address that could be sending
214 * to us. Mostly for partially-received split packets.
215 */
216struct Incoming {
217 struct sk_buff *skb; /* packet data buffer */
218 __be16 sequence; /* sequence number of assembly */
219 uint8_t lastpacket, /* number of last packet (from 1) */
220 numpackets; /* number of packets in split */
221};
222
223
224/* only needed for RFC1201 */
225struct Outgoing {
226 struct ArcProto *proto; /* protocol driver that owns this:
227 * if NULL, no packet is pending.
228 */
229 struct sk_buff *skb; /* buffer from upper levels */
230 struct archdr *pkt; /* a pointer into the skb */
231 uint16_t length, /* bytes total */
232 dataleft, /* bytes left */
233 segnum, /* segment being sent */
234 numsegs; /* number of segments */
235};
236
237
238struct arcnet_local {
239 uint8_t config, /* current value of CONFIG register */
240 timeout, /* Extended timeout for COM20020 */
241 backplane, /* Backplane flag for COM20020 */
242 clockp, /* COM20020 clock divider */
243 clockm, /* COM20020 clock multiplier flag */
244 setup, /* Contents of setup1 register */
245 setup2, /* Contents of setup2 register */
246 intmask; /* current value of INTMASK register */
247 uint8_t default_proto[256]; /* default encap to use for each host */
248 int cur_tx, /* buffer used by current transmit, or -1 */
249 next_tx, /* buffer where a packet is ready to send */
250 cur_rx; /* current receive buffer */
251 int lastload_dest, /* can last loaded packet be acked? */
252 lasttrans_dest; /* can last TX'd packet be acked? */
253 int timed_out; /* need to process TX timeout and drop packet */
254 unsigned long last_timeout; /* time of last reported timeout */
255 char *card_name; /* card ident string */
256 int card_flags; /* special card features */
257
258
259 /* On preemtive and SMB a lock is needed */
260 spinlock_t lock;
261
262 /*
263 * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of
264 * which can be used for either sending or receiving. The new dynamic
265 * buffer management routines use a simple circular queue of available
266 * buffers, and take them as they're needed. This way, we simplify
267 * situations in which we (for example) want to pre-load a transmit
268 * buffer, or start receiving while we copy a received packet to
269 * memory.
270 *
271 * The rules: only the interrupt handler is allowed to _add_ buffers to
272 * the queue; thus, this doesn't require a lock. Both the interrupt
273 * handler and the transmit function will want to _remove_ buffers, so
274 * we need to handle the situation where they try to do it at the same
275 * time.
276 *
277 * If next_buf == first_free_buf, the queue is empty. Since there are
278 * only four possible buffers, the queue should never be full.
279 */
280 atomic_t buf_lock;
281 int buf_queue[5];
282 int next_buf, first_free_buf;
283
284 /* network "reconfiguration" handling */
285 unsigned long first_recon; /* time of "first" RECON message to count */
286 unsigned long last_recon; /* time of most recent RECON */
287 int num_recons; /* number of RECONs between first and last. */
288 bool network_down; /* do we think the network is down? */
289
290 bool excnak_pending; /* We just got an excesive nak interrupt */
291
292 struct {
293 uint16_t sequence; /* sequence number (incs with each packet) */
294 __be16 aborted_seq;
295
296 struct Incoming incoming[256]; /* one from each address */
297 } rfc1201;
298
299 /* really only used by rfc1201, but we'll pretend it's not */
300 struct Outgoing outgoing; /* packet currently being sent */
301
302 /* hardware-specific functions */
303 struct {
304 struct module *owner;
305 void (*command) (struct net_device * dev, int cmd);
306 int (*status) (struct net_device * dev);
307 void (*intmask) (struct net_device * dev, int mask);
308 bool (*reset) (struct net_device * dev, bool really_reset);
309 void (*open) (struct net_device * dev);
310 void (*close) (struct net_device * dev);
311
312 void (*copy_to_card) (struct net_device * dev, int bufnum, int offset,
313 void *buf, int count);
314 void (*copy_from_card) (struct net_device * dev, int bufnum, int offset,
315 void *buf, int count);
316 } hw;
317
318 void __iomem *mem_start; /* pointer to ioremap'ed MMIO */
319};
320
321
322#define ARCRESET(x) (lp->hw.reset(dev, (x)))
323#define ACOMMAND(x) (lp->hw.command(dev, (x)))
324#define ASTATUS() (lp->hw.status(dev))
325#define AINTMASK(x) (lp->hw.intmask(dev, (x)))
326
327
328
329#if ARCNET_DEBUG_MAX & D_SKB
330void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc);
331#else
332#define arcnet_dump_skb(dev,skb,desc) ;
333#endif
334
335void arcnet_unregister_proto(struct ArcProto *proto);
336irqreturn_t arcnet_interrupt(int irq, void *dev_id);
337struct net_device *alloc_arcdev(const char *name);
338
339int arcnet_open(struct net_device *dev);
340int arcnet_close(struct net_device *dev);
341netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
342 struct net_device *dev);
343void arcnet_timeout(struct net_device *dev);
344
345#endif /* __KERNEL__ */
346#endif /* _LINUX_ARCDEVICE_H */