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 * Define this to the minimum "timeout" value. If a transmit takes longer 39 * than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large 40 * network, or one with heavy network traffic, this timeout may need to be 41 * increased. The larger it is, though, the longer it will be between 42 * necessary transmits - don't set this too high. 43 */ 44 #define TX_TIMEOUT (HZ * 200 / 1000) 45 46 /* Display warnings about the driver being an ALPHA version. */ 47 #undef ALPHA_WARNING 48 49 /* 50 * Debugging bitflags: each option can be enabled individually. 51 * 52 * Note: only debug flags included in the ARCNET_DEBUG_MAX define will 53 * actually be available. GCC will (at least, GCC 2.7.0 will) notice 54 * lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize 55 * them out. 56 */ 57 #define D_NORMAL 1 /* important operational info */ 58 #define D_EXTRA 2 /* useful, but non-vital information */ 59 #define D_INIT 4 /* show init/probe messages */ 60 #define D_INIT_REASONS 8 /* show reasons for discarding probes */ 61 #define D_RECON 32 /* print a message whenever token is lost */ 62 #define D_PROTO 64 /* debug auto-protocol support */ 63 /* debug levels below give LOTS of output during normal operation! */ 64 #define D_DURING 128 /* trace operations (including irq's) */ 65 #define D_TX 256 /* show tx packets */ 66 #define D_RX 512 /* show rx packets */ 67 #define D_SKB 1024 /* show skb's */ 68 #define D_SKB_SIZE 2048 /* show skb sizes */ 69 #define D_TIMING 4096 /* show time needed to copy buffers to card */ 70 #define D_DEBUG 8192 /* Very detailed debug line for line */ 71 72 #ifndef ARCNET_DEBUG_MAX 73 #define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */ 74 #endif 75 76 #ifndef ARCNET_DEBUG 77 #define ARCNET_DEBUG (D_NORMAL | D_EXTRA) 78 #endif 79 extern int arcnet_debug; 80 81 #define BUGLVL(x) ((x) & ARCNET_DEBUG_MAX & arcnet_debug) 82 83 /* macros to simplify debug checking */ 84 #define arc_printk(x, dev, fmt, ...) \ 85 do { \ 86 if (BUGLVL(x)) { \ 87 if ((x) == D_NORMAL) \ 88 netdev_warn(dev, fmt, ##__VA_ARGS__); \ 89 else if ((x) < D_DURING) \ 90 netdev_info(dev, fmt, ##__VA_ARGS__); \ 91 else \ 92 netdev_dbg(dev, fmt, ##__VA_ARGS__); \ 93 } \ 94 } while (0) 95 96 #define arc_cont(x, fmt, ...) \ 97 do { \ 98 if (BUGLVL(x)) \ 99 pr_cont(fmt, ##__VA_ARGS__); \ 100 } while (0) 101 102 /* see how long a function call takes to run, expressed in CPU cycles */ 103 #define TIME(dev, name, bytes, call) \ 104 do { \ 105 if (BUGLVL(D_TIMING)) { \ 106 unsigned long _x, _y; \ 107 _x = get_cycles(); \ 108 call; \ 109 _y = get_cycles(); \ 110 arc_printk(D_TIMING, dev, \ 111 "%s: %d bytes in %lu cycles == %lu Kbytes/100Mcycle\n", \ 112 name, bytes, _y - _x, \ 113 100000000 / 1024 * bytes / (_y - _x + 1)); \ 114 } else { \ 115 call; \ 116 } \ 117 } while (0) 118 119 /* 120 * Time needed to reset the card - in ms (milliseconds). This works on my 121 * SMC PC100. I can't find a reference that tells me just how long I 122 * should wait. 123 */ 124 #define RESETtime (300) 125 126 /* 127 * These are the max/min lengths of packet payload, not including the 128 * arc_hardware header, but definitely including the soft header. 129 * 130 * Note: packet sizes 254, 255, 256 are impossible because of the way 131 * ARCnet registers work That's why RFC1201 defines "exception" packets. 132 * In non-RFC1201 protocols, we have to just tack some extra bytes on the 133 * end. 134 */ 135 #define MTU 253 /* normal packet max size */ 136 #define MinTU 257 /* extended packet min size */ 137 #define XMTU 508 /* extended packet max size */ 138 139 /* status/interrupt mask bit fields */ 140 #define TXFREEflag 0x01 /* transmitter available */ 141 #define TXACKflag 0x02 /* transmitted msg. ackd */ 142 #define RECONflag 0x04 /* network reconfigured */ 143 #define TESTflag 0x08 /* test flag */ 144 #define EXCNAKflag 0x08 /* excesive nak flag */ 145 #define RESETflag 0x10 /* power-on-reset */ 146 #define RES1flag 0x20 /* reserved - usually set by jumper */ 147 #define RES2flag 0x40 /* reserved - usually set by jumper */ 148 #define NORXflag 0x80 /* receiver inhibited */ 149 150 /* Flags used for IO-mapped memory operations */ 151 #define AUTOINCflag 0x40 /* Increase location with each access */ 152 #define IOMAPflag 0x02 /* (for 90xx) Use IO mapped memory, not mmap */ 153 #define ENABLE16flag 0x80 /* (for 90xx) Enable 16-bit mode */ 154 155 /* in the command register, the following bits have these meanings: 156 * 0-2 command 157 * 3-4 page number (for enable rcv/xmt command) 158 * 7 receive broadcasts 159 */ 160 #define NOTXcmd 0x01 /* disable transmitter */ 161 #define NORXcmd 0x02 /* disable receiver */ 162 #define TXcmd 0x03 /* enable transmitter */ 163 #define RXcmd 0x04 /* enable receiver */ 164 #define CONFIGcmd 0x05 /* define configuration */ 165 #define CFLAGScmd 0x06 /* clear flags */ 166 #define TESTcmd 0x07 /* load test flags */ 167 #define STARTIOcmd 0x18 /* start internal operation */ 168 169 /* flags for "clear flags" command */ 170 #define RESETclear 0x08 /* power-on-reset */ 171 #define CONFIGclear 0x10 /* system reconfigured */ 172 173 #define EXCNAKclear 0x0E /* Clear and acknowledge the excive nak bit */ 174 175 /* flags for "load test flags" command */ 176 #define TESTload 0x08 /* test flag (diagnostic) */ 177 178 /* byte deposited into first address of buffers on reset */ 179 #define TESTvalue 0321 /* that's octal for 0xD1 :) */ 180 181 /* for "enable receiver" command */ 182 #define RXbcasts 0x80 /* receive broadcasts */ 183 184 /* flags for "define configuration" command */ 185 #define NORMALconf 0x00 /* 1-249 byte packets */ 186 #define EXTconf 0x08 /* 250-504 byte packets */ 187 188 /* card feature flags, set during auto-detection. 189 * (currently only used by com20020pci) 190 */ 191 #define ARC_IS_5MBIT 1 /* card default speed is 5MBit */ 192 #define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit, 193 but default is 2.5MBit. */ 194 195 /* information needed to define an encapsulation driver */ 196 struct ArcProto { 197 char suffix; /* a for RFC1201, e for ether-encap, etc. */ 198 int mtu; /* largest possible packet */ 199 int is_ip; /* This is a ip plugin - not a raw thing */ 200 201 void (*rx)(struct net_device *dev, int bufnum, 202 struct archdr *pkthdr, int length); 203 int (*build_header)(struct sk_buff *skb, struct net_device *dev, 204 unsigned short ethproto, uint8_t daddr); 205 206 /* these functions return '1' if the skb can now be freed */ 207 int (*prepare_tx)(struct net_device *dev, struct archdr *pkt, 208 int length, int bufnum); 209 int (*continue_tx)(struct net_device *dev, int bufnum); 210 int (*ack_tx)(struct net_device *dev, int acked); 211 }; 212 213 extern struct ArcProto *arc_proto_map[256], *arc_proto_default, 214 *arc_bcast_proto, *arc_raw_proto; 215 216 /* 217 * "Incoming" is information needed for each address that could be sending 218 * to us. Mostly for partially-received split packets. 219 */ 220 struct Incoming { 221 struct sk_buff *skb; /* packet data buffer */ 222 __be16 sequence; /* sequence number of assembly */ 223 uint8_t lastpacket, /* number of last packet (from 1) */ 224 numpackets; /* number of packets in split */ 225 }; 226 227 /* only needed for RFC1201 */ 228 struct Outgoing { 229 struct ArcProto *proto; /* protocol driver that owns this: 230 * if NULL, no packet is pending. 231 */ 232 struct sk_buff *skb; /* buffer from upper levels */ 233 struct archdr *pkt; /* a pointer into the skb */ 234 uint16_t length, /* bytes total */ 235 dataleft, /* bytes left */ 236 segnum, /* segment being sent */ 237 numsegs; /* number of segments */ 238 }; 239 240 struct arcnet_local { 241 uint8_t config, /* current value of CONFIG register */ 242 timeout, /* Extended timeout for COM20020 */ 243 backplane, /* Backplane flag for COM20020 */ 244 clockp, /* COM20020 clock divider */ 245 clockm, /* COM20020 clock multiplier flag */ 246 setup, /* Contents of setup1 register */ 247 setup2, /* Contents of setup2 register */ 248 intmask; /* current value of INTMASK register */ 249 uint8_t default_proto[256]; /* default encap to use for each host */ 250 int cur_tx, /* buffer used by current transmit, or -1 */ 251 next_tx, /* buffer where a packet is ready to send */ 252 cur_rx; /* current receive buffer */ 253 int lastload_dest, /* can last loaded packet be acked? */ 254 lasttrans_dest; /* can last TX'd packet be acked? */ 255 int timed_out; /* need to process TX timeout and drop packet */ 256 unsigned long last_timeout; /* time of last reported timeout */ 257 char *card_name; /* card ident string */ 258 int card_flags; /* special card features */ 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 unsigned long first_recon; /* time of "first" RECON message to count */ 287 unsigned long last_recon; /* time of most recent RECON */ 288 int num_recons; /* number of RECONs between first and last. */ 289 int network_down; /* do we think the network is down? */ 290 291 int excnak_pending; /* We just got an excesive nak interrupt */ 292 293 struct { 294 uint16_t sequence; /* sequence number (incs with each packet) */ 295 __be16 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 int (*reset)(struct net_device *dev, int 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, 314 int offset, void *buf, int count); 315 void (*copy_from_card)(struct net_device *dev, int bufnum, 316 int offset, void *buf, int count); 317 } hw; 318 319 void __iomem *mem_start; /* pointer to ioremap'ed MMIO */ 320 }; 321 322 #if ARCNET_DEBUG_MAX & D_SKB 323 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc); 324 #else 325 static inline 326 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc) 327 { 328 } 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 /* I/O equivalents */ 342 343 #ifdef CONFIG_SA1100_CT6001 344 #define BUS_ALIGN 2 /* 8 bit device on a 16 bit bus - needs padding */ 345 #else 346 #define BUS_ALIGN 1 347 #endif 348 349 /* addr and offset allow register like names to define the actual IO address. 350 * A configuration option multiplies the offset for alignment. 351 */ 352 #define arcnet_inb(addr, offset) \ 353 inb((addr) + BUS_ALIGN * (offset)) 354 #define arcnet_outb(value, addr, offset) \ 355 outb(value, (addr) + BUS_ALIGN * (offset)) 356 357 #define arcnet_insb(addr, offset, buffer, count) \ 358 insb((addr) + BUS_ALIGN * (offset), buffer, count) 359 #define arcnet_outsb(addr, offset, buffer, count) \ 360 outsb((addr) + BUS_ALIGN * (offset), buffer, count) 361 362 #define arcnet_readb(addr, offset) \ 363 readb((addr) + (offset)) 364 #define arcnet_writeb(value, addr, offset) \ 365 writeb(value, (addr) + (offset)) 366 367 #endif /* __KERNEL__ */ 368 #endif /* _LINUX_ARCDEVICE_H */ 369