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Diffstat (limited to 'include/linux/arcdevice.h')
| -rw-r--r-- | include/linux/arcdevice.h | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/include/linux/arcdevice.h b/include/linux/arcdevice.h new file mode 100644 index 000000000000..7198f129e135 --- /dev/null +++ b/include/linux/arcdevice.h @@ -0,0 +1,350 @@ +/* + * 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__ + +#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; +extern struct ArcProto arc_proto_null; + + +/* + * "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 */ + uint16_t 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 { + struct net_device_stats stats; + + 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 */ + time_t first_recon, /* time of "first" RECON message to count */ + 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) */ + uint16_t 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 + +#if (ARCNET_DEBUG_MAX & D_RX) || (ARCNET_DEBUG_MAX & D_TX) +void arcnet_dump_packet(struct net_device *dev, int bufnum, char *desc, + int take_arcnet_lock); +#else +#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) ; +#endif + +void arcnet_unregister_proto(struct ArcProto *proto); +irqreturn_t arcnet_interrupt(int irq, void *dev_id, struct pt_regs *regs); +struct net_device *alloc_arcdev(char *name); +void arcnet_rx(struct net_device *dev, int bufnum); + +#endif /* __KERNEL__ */ +#endif /* _LINUX_ARCDEVICE_H */ |