/*
* 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>
/*
* 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. */
int network_down; /* do we think the network is down? */
int 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);
int (*reset) (struct net_device * dev, int 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 */