1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. NET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Definitions used by the ARCnet driver. 8 * 9 * Authors: Avery Pennarun and David Woodhouse 10 */ 11 #ifndef _LINUX_ARCDEVICE_H 12 #define _LINUX_ARCDEVICE_H 13 14 #include <asm/timex.h> 15 #include <linux/if_arcnet.h> 16 17 #ifdef __KERNEL__ 18 #include <linux/interrupt.h> 19 20 /* 21 * RECON_THRESHOLD is the maximum number of RECON messages to receive 22 * within one minute before printing a "cabling problem" warning. The 23 * default value should be fine. 24 * 25 * After that, a "cabling restored" message will be printed on the next IRQ 26 * if no RECON messages have been received for 10 seconds. 27 * 28 * Do not define RECON_THRESHOLD at all if you want to disable this feature. 29 */ 30 #define RECON_THRESHOLD 30 31 32 /* 33 * Define this to the minimum "timeout" value. If a transmit takes longer 34 * than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large 35 * network, or one with heavy network traffic, this timeout may need to be 36 * increased. The larger it is, though, the longer it will be between 37 * necessary transmits - don't set this too high. 38 */ 39 #define TX_TIMEOUT (HZ * 200 / 1000) 40 41 /* Display warnings about the driver being an ALPHA version. */ 42 #undef ALPHA_WARNING 43 44 /* 45 * Debugging bitflags: each option can be enabled individually. 46 * 47 * Note: only debug flags included in the ARCNET_DEBUG_MAX define will 48 * actually be available. GCC will (at least, GCC 2.7.0 will) notice 49 * lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize 50 * them out. 51 */ 52 #define D_NORMAL 1 /* important operational info */ 53 #define D_EXTRA 2 /* useful, but non-vital information */ 54 #define D_INIT 4 /* show init/probe messages */ 55 #define D_INIT_REASONS 8 /* show reasons for discarding probes */ 56 #define D_RECON 32 /* print a message whenever token is lost */ 57 #define D_PROTO 64 /* debug auto-protocol support */ 58 /* debug levels below give LOTS of output during normal operation! */ 59 #define D_DURING 128 /* trace operations (including irq's) */ 60 #define D_TX 256 /* show tx packets */ 61 #define D_RX 512 /* show rx packets */ 62 #define D_SKB 1024 /* show skb's */ 63 #define D_SKB_SIZE 2048 /* show skb sizes */ 64 #define D_TIMING 4096 /* show time needed to copy buffers to card */ 65 #define D_DEBUG 8192 /* Very detailed debug line for line */ 66 67 #ifndef ARCNET_DEBUG_MAX 68 #define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */ 69 #endif 70 71 #ifndef ARCNET_DEBUG 72 #define ARCNET_DEBUG (D_NORMAL | D_EXTRA) 73 #endif 74 extern int arcnet_debug; 75 76 #define BUGLVL(x) ((x) & ARCNET_DEBUG_MAX & arcnet_debug) 77 78 /* macros to simplify debug checking */ 79 #define arc_printk(x, dev, fmt, ...) \ 80 do { \ 81 if (BUGLVL(x)) { \ 82 if ((x) == D_NORMAL) \ 83 netdev_warn(dev, fmt, ##__VA_ARGS__); \ 84 else if ((x) < D_DURING) \ 85 netdev_info(dev, fmt, ##__VA_ARGS__); \ 86 else \ 87 netdev_dbg(dev, fmt, ##__VA_ARGS__); \ 88 } \ 89 } while (0) 90 91 #define arc_cont(x, fmt, ...) \ 92 do { \ 93 if (BUGLVL(x)) \ 94 pr_cont(fmt, ##__VA_ARGS__); \ 95 } while (0) 96 97 /* see how long a function call takes to run, expressed in CPU cycles */ 98 #define TIME(dev, name, bytes, call) \ 99 do { \ 100 if (BUGLVL(D_TIMING)) { \ 101 unsigned long _x, _y; \ 102 _x = get_cycles(); \ 103 call; \ 104 _y = get_cycles(); \ 105 arc_printk(D_TIMING, dev, \ 106 "%s: %d bytes in %lu cycles == %lu Kbytes/100Mcycle\n", \ 107 name, bytes, _y - _x, \ 108 100000000 / 1024 * bytes / (_y - _x + 1)); \ 109 } else { \ 110 call; \ 111 } \ 112 } while (0) 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 #define STARTIOcmd 0x18 /* start internal operation */ 163 164 /* flags for "clear flags" command */ 165 #define RESETclear 0x08 /* power-on-reset */ 166 #define CONFIGclear 0x10 /* system reconfigured */ 167 168 #define EXCNAKclear 0x0E /* Clear and acknowledge the excive nak bit */ 169 170 /* flags for "load test flags" command */ 171 #define TESTload 0x08 /* test flag (diagnostic) */ 172 173 /* byte deposited into first address of buffers on reset */ 174 #define TESTvalue 0321 /* that's octal for 0xD1 :) */ 175 176 /* for "enable receiver" command */ 177 #define RXbcasts 0x80 /* receive broadcasts */ 178 179 /* flags for "define configuration" command */ 180 #define NORMALconf 0x00 /* 1-249 byte packets */ 181 #define EXTconf 0x08 /* 250-504 byte packets */ 182 183 /* card feature flags, set during auto-detection. 184 * (currently only used by com20020pci) 185 */ 186 #define ARC_IS_5MBIT 1 /* card default speed is 5MBit */ 187 #define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit, 188 but default is 2.5MBit. */ 189 190 /* information needed to define an encapsulation driver */ 191 struct 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, 203 int length, int bufnum); 204 int (*continue_tx)(struct net_device *dev, int bufnum); 205 int (*ack_tx)(struct net_device *dev, int acked); 206 }; 207 208 extern struct ArcProto *arc_proto_map[256], *arc_proto_default, 209 *arc_bcast_proto, *arc_raw_proto; 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 __be16 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 /* only needed for RFC1201 */ 223 struct Outgoing { 224 struct ArcProto *proto; /* protocol driver that owns this: 225 * if NULL, no packet is pending. 226 */ 227 struct sk_buff *skb; /* buffer from upper levels */ 228 struct archdr *pkt; /* a pointer into the skb */ 229 uint16_t length, /* bytes total */ 230 dataleft, /* bytes left */ 231 segnum, /* segment being sent */ 232 numsegs; /* number of segments */ 233 }; 234 235 #define ARCNET_LED_NAME_SZ (IFNAMSIZ + 6) 236 237 struct arcnet_local { 238 uint8_t config, /* current value of CONFIG register */ 239 timeout, /* Extended timeout for COM20020 */ 240 backplane, /* Backplane flag for COM20020 */ 241 clockp, /* COM20020 clock divider */ 242 clockm, /* COM20020 clock multiplier flag */ 243 setup, /* Contents of setup1 register */ 244 setup2, /* Contents of setup2 register */ 245 intmask; /* current value of INTMASK register */ 246 uint8_t default_proto[256]; /* default encap to use for each host */ 247 int cur_tx, /* buffer used by current transmit, or -1 */ 248 next_tx, /* buffer where a packet is ready to send */ 249 cur_rx; /* current receive buffer */ 250 int lastload_dest, /* can last loaded packet be acked? */ 251 lasttrans_dest; /* can last TX'd packet be acked? */ 252 int timed_out; /* need to process TX timeout and drop packet */ 253 unsigned long last_timeout; /* time of last reported timeout */ 254 char *card_name; /* card ident string */ 255 int card_flags; /* special card features */ 256 257 /* On preemtive and SMB a lock is needed */ 258 spinlock_t lock; 259 260 struct led_trigger *tx_led_trig; 261 char tx_led_trig_name[ARCNET_LED_NAME_SZ]; 262 struct led_trigger *recon_led_trig; 263 char recon_led_trig_name[ARCNET_LED_NAME_SZ]; 264 265 struct timer_list timer; 266 267 struct net_device *dev; 268 int reply_status; 269 struct tasklet_struct reply_tasklet; 270 271 /* 272 * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of 273 * which can be used for either sending or receiving. The new dynamic 274 * buffer management routines use a simple circular queue of available 275 * buffers, and take them as they're needed. This way, we simplify 276 * situations in which we (for example) want to pre-load a transmit 277 * buffer, or start receiving while we copy a received packet to 278 * memory. 279 * 280 * The rules: only the interrupt handler is allowed to _add_ buffers to 281 * the queue; thus, this doesn't require a lock. Both the interrupt 282 * handler and the transmit function will want to _remove_ buffers, so 283 * we need to handle the situation where they try to do it at the same 284 * time. 285 * 286 * If next_buf == first_free_buf, the queue is empty. Since there are 287 * only four possible buffers, the queue should never be full. 288 */ 289 atomic_t buf_lock; 290 int buf_queue[5]; 291 int next_buf, first_free_buf; 292 293 /* network "reconfiguration" handling */ 294 unsigned long first_recon; /* time of "first" RECON message to count */ 295 unsigned long last_recon; /* time of most recent RECON */ 296 int num_recons; /* number of RECONs between first and last. */ 297 int network_down; /* do we think the network is down? */ 298 299 int excnak_pending; /* We just got an excesive nak interrupt */ 300 301 /* RESET flag handling */ 302 int reset_in_progress; 303 struct work_struct reset_work; 304 305 struct { 306 uint16_t sequence; /* sequence number (incs with each packet) */ 307 __be16 aborted_seq; 308 309 struct Incoming incoming[256]; /* one from each address */ 310 } rfc1201; 311 312 /* really only used by rfc1201, but we'll pretend it's not */ 313 struct Outgoing outgoing; /* packet currently being sent */ 314 315 /* hardware-specific functions */ 316 struct { 317 struct module *owner; 318 void (*command)(struct net_device *dev, int cmd); 319 int (*status)(struct net_device *dev); 320 void (*intmask)(struct net_device *dev, int mask); 321 int (*reset)(struct net_device *dev, int really_reset); 322 void (*open)(struct net_device *dev); 323 void (*close)(struct net_device *dev); 324 void (*datatrigger) (struct net_device * dev, int enable); 325 void (*recontrigger) (struct net_device * dev, int enable); 326 327 void (*copy_to_card)(struct net_device *dev, int bufnum, 328 int offset, void *buf, int count); 329 void (*copy_from_card)(struct net_device *dev, int bufnum, 330 int offset, void *buf, int count); 331 } hw; 332 333 void __iomem *mem_start; /* pointer to ioremap'ed MMIO */ 334 }; 335 336 enum arcnet_led_event { 337 ARCNET_LED_EVENT_RECON, 338 ARCNET_LED_EVENT_OPEN, 339 ARCNET_LED_EVENT_STOP, 340 ARCNET_LED_EVENT_TX, 341 }; 342 343 void arcnet_led_event(struct net_device *netdev, enum arcnet_led_event event); 344 void devm_arcnet_led_init(struct net_device *netdev, int index, int subid); 345 346 #if ARCNET_DEBUG_MAX & D_SKB 347 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc); 348 #else 349 static inline 350 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc) 351 { 352 } 353 #endif 354 355 void arcnet_unregister_proto(struct ArcProto *proto); 356 irqreturn_t arcnet_interrupt(int irq, void *dev_id); 357 358 struct net_device *alloc_arcdev(const char *name); 359 void free_arcdev(struct net_device *dev); 360 361 int arcnet_open(struct net_device *dev); 362 int arcnet_close(struct net_device *dev); 363 netdev_tx_t arcnet_send_packet(struct sk_buff *skb, 364 struct net_device *dev); 365 void arcnet_timeout(struct net_device *dev, unsigned int txqueue); 366 367 /* I/O equivalents */ 368 369 #ifdef CONFIG_SA1100_CT6001 370 #define BUS_ALIGN 2 /* 8 bit device on a 16 bit bus - needs padding */ 371 #else 372 #define BUS_ALIGN 1 373 #endif 374 375 /* addr and offset allow register like names to define the actual IO address. 376 * A configuration option multiplies the offset for alignment. 377 */ 378 #define arcnet_inb(addr, offset) \ 379 inb((addr) + BUS_ALIGN * (offset)) 380 #define arcnet_outb(value, addr, offset) \ 381 outb(value, (addr) + BUS_ALIGN * (offset)) 382 383 #define arcnet_insb(addr, offset, buffer, count) \ 384 insb((addr) + BUS_ALIGN * (offset), buffer, count) 385 #define arcnet_outsb(addr, offset, buffer, count) \ 386 outsb((addr) + BUS_ALIGN * (offset), buffer, count) 387 388 #define arcnet_readb(addr, offset) \ 389 readb((addr) + (offset)) 390 #define arcnet_writeb(value, addr, offset) \ 391 writeb(value, (addr) + (offset)) 392 393 #endif /* __KERNEL__ */ 394 #endif /* _LINUX_ARCDEVICE_H */ 395