Edit File: arcdevice.h
/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. NET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions used by the ARCnet driver. * * Authors: Avery Pennarun and David Woodhouse * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #ifndef _LINUX_ARCDEVICE_H #define _LINUX_ARCDEVICE_H #include <asm/timex.h> #include <linux/if_arcnet.h> #ifdef __KERNEL__ #include <linux/irqreturn.h> #ifndef bool #define bool int #endif /* * RECON_THRESHOLD is the maximum number of RECON messages to receive * within one minute before printing a "cabling problem" warning. The * default value should be fine. * * After that, a "cabling restored" message will be printed on the next IRQ * if no RECON messages have been received for 10 seconds. * * Do not define RECON_THRESHOLD at all if you want to disable this feature. */ #define RECON_THRESHOLD 30 /* * Define this to the minimum "timeout" value. If a transmit takes longer * than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large * network, or one with heavy network traffic, this timeout may need to be * increased. The larger it is, though, the longer it will be between * necessary transmits - don't set this too high. */ #define TX_TIMEOUT (HZ * 200 / 1000) /* Display warnings about the driver being an ALPHA version. */ #undef ALPHA_WARNING /* * Debugging bitflags: each option can be enabled individually. * * Note: only debug flags included in the ARCNET_DEBUG_MAX define will * actually be available. GCC will (at least, GCC 2.7.0 will) notice * lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize * them out. */ #define D_NORMAL 1 /* important operational info */ #define D_EXTRA 2 /* useful, but non-vital information */ #define D_INIT 4 /* show init/probe messages */ #define D_INIT_REASONS 8 /* show reasons for discarding probes */ #define D_RECON 32 /* print a message whenever token is lost */ #define D_PROTO 64 /* debug auto-protocol support */ /* debug levels below give LOTS of output during normal operation! */ #define D_DURING 128 /* trace operations (including irq's) */ #define D_TX 256 /* show tx packets */ #define D_RX 512 /* show rx packets */ #define D_SKB 1024 /* show skb's */ #define D_SKB_SIZE 2048 /* show skb sizes */ #define D_TIMING 4096 /* show time needed to copy buffers to card */ #define D_DEBUG 8192 /* Very detailed debug line for line */ #ifndef ARCNET_DEBUG_MAX #define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */ #endif #ifndef ARCNET_DEBUG #define ARCNET_DEBUG (D_NORMAL|D_EXTRA) #endif extern int arcnet_debug; /* macros to simplify debug checking */ #define BUGLVL(x) if ((ARCNET_DEBUG_MAX)&arcnet_debug&(x)) #define BUGMSG2(x,msg,args...) do { BUGLVL(x) printk(msg, ## args); } while (0) #define BUGMSG(x,msg,args...) \ BUGMSG2(x, "%s%6s: " msg, \ x==D_NORMAL ? KERN_WARNING \ : x < D_DURING ? KERN_INFO : KERN_DEBUG, \ dev->name , ## args) /* see how long a function call takes to run, expressed in CPU cycles */ #define TIME(name, bytes, call) BUGLVL(D_TIMING) { \ unsigned long _x, _y; \ _x = get_cycles(); \ call; \ _y = get_cycles(); \ BUGMSG(D_TIMING, \ "%s: %d bytes in %lu cycles == " \ "%lu Kbytes/100Mcycle\n",\ name, bytes, _y - _x, \ 100000000 / 1024 * bytes / (_y - _x + 1));\ } \ else { \ call;\ } /* * Time needed to reset the card - in ms (milliseconds). This works on my * SMC PC100. I can't find a reference that tells me just how long I * should wait. */ #define RESETtime (300) /* * These are the max/min lengths of packet payload, not including the * arc_hardware header, but definitely including the soft header. * * Note: packet sizes 254, 255, 256 are impossible because of the way * ARCnet registers work That's why RFC1201 defines "exception" packets. * In non-RFC1201 protocols, we have to just tack some extra bytes on the * end. */ #define MTU 253 /* normal packet max size */ #define MinTU 257 /* extended packet min size */ #define XMTU 508 /* extended packet max size */ /* status/interrupt mask bit fields */ #define TXFREEflag 0x01 /* transmitter available */ #define TXACKflag 0x02 /* transmitted msg. ackd */ #define RECONflag 0x04 /* network reconfigured */ #define TESTflag 0x08 /* test flag */ #define EXCNAKflag 0x08 /* excesive nak flag */ #define RESETflag 0x10 /* power-on-reset */ #define RES1flag 0x20 /* reserved - usually set by jumper */ #define RES2flag 0x40 /* reserved - usually set by jumper */ #define NORXflag 0x80 /* receiver inhibited */ /* Flags used for IO-mapped memory operations */ #define AUTOINCflag 0x40 /* Increase location with each access */ #define IOMAPflag 0x02 /* (for 90xx) Use IO mapped memory, not mmap */ #define ENABLE16flag 0x80 /* (for 90xx) Enable 16-bit mode */ /* in the command register, the following bits have these meanings: * 0-2 command * 3-4 page number (for enable rcv/xmt command) * 7 receive broadcasts */ #define NOTXcmd 0x01 /* disable transmitter */ #define NORXcmd 0x02 /* disable receiver */ #define TXcmd 0x03 /* enable transmitter */ #define RXcmd 0x04 /* enable receiver */ #define CONFIGcmd 0x05 /* define configuration */ #define CFLAGScmd 0x06 /* clear flags */ #define TESTcmd 0x07 /* load test flags */ /* flags for "clear flags" command */ #define RESETclear 0x08 /* power-on-reset */ #define CONFIGclear 0x10 /* system reconfigured */ #define EXCNAKclear 0x0E /* Clear and acknowledge the excive nak bit */ /* flags for "load test flags" command */ #define TESTload 0x08 /* test flag (diagnostic) */ /* byte deposited into first address of buffers on reset */ #define TESTvalue 0321 /* that's octal for 0xD1 :) */ /* for "enable receiver" command */ #define RXbcasts 0x80 /* receive broadcasts */ /* flags for "define configuration" command */ #define NORMALconf 0x00 /* 1-249 byte packets */ #define EXTconf 0x08 /* 250-504 byte packets */ /* card feature flags, set during auto-detection. * (currently only used by com20020pci) */ #define ARC_IS_5MBIT 1 /* card default speed is 5MBit */ #define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit, but default is 2.5MBit. */ /* information needed to define an encapsulation driver */ struct ArcProto { char suffix; /* a for RFC1201, e for ether-encap, etc. */ int mtu; /* largest possible packet */ int is_ip; /* This is a ip plugin - not a raw thing */ void (*rx) (struct net_device * dev, int bufnum, struct archdr * pkthdr, int length); int (*build_header) (struct sk_buff * skb, struct net_device *dev, unsigned short ethproto, uint8_t daddr); /* these functions return '1' if the skb can now be freed */ int (*prepare_tx) (struct net_device * dev, struct archdr * pkt, int length, int bufnum); int (*continue_tx) (struct net_device * dev, int bufnum); int (*ack_tx) (struct net_device * dev, int acked); }; extern struct ArcProto *arc_proto_map[256], *arc_proto_default, *arc_bcast_proto, *arc_raw_proto; /* * "Incoming" is information needed for each address that could be sending * to us. Mostly for partially-received split packets. */ struct Incoming { struct sk_buff *skb; /* packet data buffer */ __be16 sequence; /* sequence number of assembly */ uint8_t lastpacket, /* number of last packet (from 1) */ numpackets; /* number of packets in split */ }; /* only needed for RFC1201 */ struct Outgoing { struct ArcProto *proto; /* protocol driver that owns this: * if NULL, no packet is pending. */ struct sk_buff *skb; /* buffer from upper levels */ struct archdr *pkt; /* a pointer into the skb */ uint16_t length, /* bytes total */ dataleft, /* bytes left */ segnum, /* segment being sent */ numsegs; /* number of segments */ }; struct arcnet_local { uint8_t config, /* current value of CONFIG register */ timeout, /* Extended timeout for COM20020 */ backplane, /* Backplane flag for COM20020 */ clockp, /* COM20020 clock divider */ clockm, /* COM20020 clock multiplier flag */ setup, /* Contents of setup1 register */ setup2, /* Contents of setup2 register */ intmask; /* current value of INTMASK register */ uint8_t default_proto[256]; /* default encap to use for each host */ int cur_tx, /* buffer used by current transmit, or -1 */ next_tx, /* buffer where a packet is ready to send */ cur_rx; /* current receive buffer */ int lastload_dest, /* can last loaded packet be acked? */ lasttrans_dest; /* can last TX'd packet be acked? */ int timed_out; /* need to process TX timeout and drop packet */ unsigned long last_timeout; /* time of last reported timeout */ char *card_name; /* card ident string */ int card_flags; /* special card features */ /* On preemtive and SMB a lock is needed */ spinlock_t lock; /* * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of * which can be used for either sending or receiving. The new dynamic * buffer management routines use a simple circular queue of available * buffers, and take them as they're needed. This way, we simplify * situations in which we (for example) want to pre-load a transmit * buffer, or start receiving while we copy a received packet to * memory. * * The rules: only the interrupt handler is allowed to _add_ buffers to * the queue; thus, this doesn't require a lock. Both the interrupt * handler and the transmit function will want to _remove_ buffers, so * we need to handle the situation where they try to do it at the same * time. * * If next_buf == first_free_buf, the queue is empty. Since there are * only four possible buffers, the queue should never be full. */ atomic_t buf_lock; int buf_queue[5]; int next_buf, first_free_buf; /* network "reconfiguration" handling */ unsigned long first_recon; /* time of "first" RECON message to count */ unsigned long last_recon; /* time of most recent RECON */ int num_recons; /* number of RECONs between first and last. */ bool network_down; /* do we think the network is down? */ bool excnak_pending; /* We just got an excesive nak interrupt */ struct { uint16_t sequence; /* sequence number (incs with each packet) */ __be16 aborted_seq; struct Incoming incoming[256]; /* one from each address */ } rfc1201; /* really only used by rfc1201, but we'll pretend it's not */ struct Outgoing outgoing; /* packet currently being sent */ /* hardware-specific functions */ struct { struct module *owner; void (*command) (struct net_device * dev, int cmd); int (*status) (struct net_device * dev); void (*intmask) (struct net_device * dev, int mask); bool (*reset) (struct net_device * dev, bool really_reset); void (*open) (struct net_device * dev); void (*close) (struct net_device * dev); void (*copy_to_card) (struct net_device * dev, int bufnum, int offset, void *buf, int count); void (*copy_from_card) (struct net_device * dev, int bufnum, int offset, void *buf, int count); } hw; void __iomem *mem_start; /* pointer to ioremap'ed MMIO */ }; #define ARCRESET(x) (lp->hw.reset(dev, (x))) #define ACOMMAND(x) (lp->hw.command(dev, (x))) #define ASTATUS() (lp->hw.status(dev)) #define AINTMASK(x) (lp->hw.intmask(dev, (x))) #if ARCNET_DEBUG_MAX & D_SKB void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc); #else #define arcnet_dump_skb(dev,skb,desc) ; #endif void arcnet_unregister_proto(struct ArcProto *proto); irqreturn_t arcnet_interrupt(int irq, void *dev_id); struct net_device *alloc_arcdev(const char *name); int arcnet_open(struct net_device *dev); int arcnet_close(struct net_device *dev); netdev_tx_t arcnet_send_packet(struct sk_buff *skb, struct net_device *dev); void arcnet_timeout(struct net_device *dev); #endif /* __KERNEL__ */ #endif /* _LINUX_ARCDEVICE_H */