drivers/net/arcnet/arcdevice.h

   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         struct {
 302                 uint16_t sequence;      /* sequence number (incs with each packet) */
 303                 __be16 aborted_seq;
 304
 305                 struct Incoming incoming[256];  /* one from each address */
 306         } rfc1201;
 307
 308         /* really only used by rfc1201, but we'll pretend it's not */
 309         struct Outgoing outgoing;       /* packet currently being sent */
 310
 311         /* hardware-specific functions */
 312         struct {
 313                 struct module *owner;
 314                 void (*command)(struct net_device *dev, int cmd);
 315                 int (*status)(struct net_device *dev);
 316                 void (*intmask)(struct net_device *dev, int mask);
 317                 int (*reset)(struct net_device *dev, int really_reset);
 318                 void (*open)(struct net_device *dev);
 319                 void (*close)(struct net_device *dev);
 320                 void (*datatrigger) (struct net_device * dev, int enable);
 321                 void (*recontrigger) (struct net_device * dev, int enable);
 322
 323                 void (*copy_to_card)(struct net_device *dev, int bufnum,
 324                                      int offset, void *buf, int count);
 325                 void (*copy_from_card)(struct net_device *dev, int bufnum,
 326                                        int offset, void *buf, int count);
 327         } hw;
 328
 329         void __iomem *mem_start;        /* pointer to ioremap'ed MMIO */
 330 };
 331
 332 enum arcnet_led_event {
 333         ARCNET_LED_EVENT_RECON,
 334         ARCNET_LED_EVENT_OPEN,
 335         ARCNET_LED_EVENT_STOP,
 336         ARCNET_LED_EVENT_TX,
 337 };
 338
 339 void arcnet_led_event(struct net_device *netdev, enum arcnet_led_event event);
 340 void devm_arcnet_led_init(struct net_device *netdev, int index, int subid);
 341
 342 #if ARCNET_DEBUG_MAX & D_SKB
 343 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc);
 344 #else
 345 static inline
 346 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc)
 347 {
 348 }
 349 #endif
 350
 351 void arcnet_unregister_proto(struct ArcProto *proto);
 352 irqreturn_t arcnet_interrupt(int irq, void *dev_id);
 353 struct net_device *alloc_arcdev(const char *name);
 354
 355 int arcnet_open(struct net_device *dev);
 356 int arcnet_close(struct net_device *dev);
 357 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
 358                                struct net_device *dev);
 359 void arcnet_timeout(struct net_device *dev, unsigned int txqueue);
 360
 361 /* I/O equivalents */
 362
 363 #ifdef CONFIG_SA1100_CT6001
 364 #define BUS_ALIGN  2  /* 8 bit device on a 16 bit bus - needs padding */
 365 #else
 366 #define BUS_ALIGN  1
 367 #endif
 368
 369 /* addr and offset allow register like names to define the actual IO  address.
 370  * A configuration option multiplies the offset for alignment.
 371  */
 372 #define arcnet_inb(addr, offset)                                        \
 373         inb((addr) + BUS_ALIGN * (offset))
 374 #define arcnet_outb(value, addr, offset)                                \
 375         outb(value, (addr) + BUS_ALIGN * (offset))
 376
 377 #define arcnet_insb(addr, offset, buffer, count)                        \
 378         insb((addr) + BUS_ALIGN * (offset), buffer, count)
 379 #define arcnet_outsb(addr, offset, buffer, count)                       \
 380         outsb((addr) + BUS_ALIGN * (offset), buffer, count)
 381
 382 #define arcnet_readb(addr, offset)                                      \
 383         readb((addr) + (offset))
 384 #define arcnet_writeb(value, addr, offset)                              \
 385         writeb(value, (addr) + (offset))
 386
 387 #endif                          /* __KERNEL__ */
 388 #endif                          /* _LINUX_ARCDEVICE_H */