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 /* 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; 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 */ 214 __be16 sequence; /* sequence number of assembly */ 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 { 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 */ 281 unsigned long first_recon; /* time of "first" RECON message to count */ 282 unsigned long last_recon; /* time of most recent RECON */ 283 int num_recons; /* number of RECONs between first and last. */ 284 int network_down; /* do we think the network is down? */ 285 286 int excnak_pending; /* We just got an excesive nak interrupt */ 287 288 struct { 289 uint16_t sequence; /* sequence number (incs with each packet) */ 290 __be16 aborted_seq; 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); 304 int (*reset) (struct net_device * dev, int really_reset); 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 330 331 void arcnet_unregister_proto(struct ArcProto *proto); 332 irqreturn_t arcnet_interrupt(int irq, void *dev_id); 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); 337 netdev_tx_t arcnet_send_packet(struct sk_buff *skb, 338 struct net_device *dev); 339 void arcnet_timeout(struct net_device *dev); 340 341 #endif /* __KERNEL__ */ 342 #endif /* _LINUX_ARCDEVICE_H */ 343