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