include/linux/arcdevice.h

   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
 168 /* flags for "clear flags" command */
 169 #define RESETclear      0x08    /* power-on-reset */
 170 #define CONFIGclear     0x10    /* system reconfigured */
 171
 172 #define EXCNAKclear     0x0E    /* Clear and acknowledge the excive nak bit */
 173
 174 /* flags for "load test flags" command */
 175 #define TESTload        0x08    /* test flag (diagnostic) */
 176
 177 /* byte deposited into first address of buffers on reset */
 178 #define TESTvalue       0321    /* that's octal for 0xD1 :) */
 179
 180 /* for "enable receiver" command */
 181 #define RXbcasts        0x80    /* receive broadcasts */
 182
 183 /* flags for "define configuration" command */
 184 #define NORMALconf      0x00    /* 1-249 byte packets */
 185 #define EXTconf         0x08    /* 250-504 byte packets */
 186
 187 /* card feature flags, set during auto-detection.
 188  * (currently only used by com20020pci)
 189  */
 190 #define ARC_IS_5MBIT    1   /* card default speed is 5MBit */
 191 #define ARC_CAN_10MBIT  2   /* card uses COM20022, supporting 10MBit,
 192                                  but default is 2.5MBit. */
 193
 194 /* information needed to define an encapsulation driver */
 195 struct ArcProto {
 196         char suffix;            /* a for RFC1201, e for ether-encap, etc. */
 197         int mtu;                /* largest possible packet */
 198         int is_ip;              /* This is a ip plugin - not a raw thing */
 199
 200         void (*rx)(struct net_device *dev, int bufnum,
 201                    struct archdr *pkthdr, int length);
 202         int (*build_header)(struct sk_buff *skb, struct net_device *dev,
 203                             unsigned short ethproto, uint8_t daddr);
 204
 205         /* these functions return '1' if the skb can now be freed */
 206         int (*prepare_tx)(struct net_device *dev, struct archdr *pkt, int length,
 207                           int bufnum);
 208         int (*continue_tx)(struct net_device *dev, int bufnum);
 209         int (*ack_tx)(struct net_device *dev, int acked);
 210 };
 211
 212 extern struct ArcProto *arc_proto_map[256], *arc_proto_default,
 213         *arc_bcast_proto, *arc_raw_proto;
 214
 215 /*
 216  * "Incoming" is information needed for each address that could be sending
 217  * to us.  Mostly for partially-received split packets.
 218  */
 219 struct Incoming {
 220         struct sk_buff *skb;    /* packet data buffer             */
 221         __be16 sequence;        /* sequence number of assembly    */
 222         uint8_t lastpacket,     /* number of last packet (from 1) */
 223                 numpackets;     /* number of packets in split     */
 224 };
 225
 226 /* only needed for RFC1201 */
 227 struct Outgoing {
 228         struct ArcProto *proto; /* protocol driver that owns this:
 229                                  *   if NULL, no packet is pending.
 230                                  */
 231         struct sk_buff *skb;    /* buffer from upper levels */
 232         struct archdr *pkt;     /* a pointer into the skb */
 233         uint16_t length,        /* bytes total */
 234                 dataleft,       /* bytes left */
 235                 segnum,         /* segment being sent */
 236                 numsegs;        /* number of segments */
 237 };
 238
 239 struct arcnet_local {
 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         /* 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         int network_down;       /* do we think the network is down? */
 289
 290         int 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                 int (*reset)(struct net_device *dev, int 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 #define ARCRESET(x)  (lp->hw.reset(dev, (x)))
 322 #define ACOMMAND(x)  (lp->hw.command(dev, (x)))
 323 #define ASTATUS()    (lp->hw.status(dev))
 324 #define AINTMASK(x)  (lp->hw.intmask(dev, (x)))
 325
 326 #if ARCNET_DEBUG_MAX & D_SKB
 327 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc);
 328 #else
 329 #define arcnet_dump_skb(dev, skb, desc) ;
 330 #endif
 331
 332 void arcnet_unregister_proto(struct ArcProto *proto);
 333 irqreturn_t arcnet_interrupt(int irq, void *dev_id);
 334 struct net_device *alloc_arcdev(const char *name);
 335
 336 int arcnet_open(struct net_device *dev);
 337 int arcnet_close(struct net_device *dev);
 338 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
 339                                struct net_device *dev);
 340 void arcnet_timeout(struct net_device *dev);
 341
 342 #endif                          /* __KERNEL__ */
 343 #endif                          /* _LINUX_ARCDEVICE_H */