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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 LT |
336 | void arcnet_unregister_proto(struct ArcProto *proto); |
337 | irqreturn_t arcnet_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
338 | struct net_device *alloc_arcdev(char *name); | |
1da177e4 LT |
339 | |
340 | #endif /* __KERNEL__ */ | |
341 | #endif /* _LINUX_ARCDEVICE_H */ |