Initial import

1 files changed, 342 insertions, 0 deletions

diff --git a/include/linux/arcdevice.h b/include/linux/arcdevice.h
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index 000000000..df0356220
--- /dev/null
+++ b/include/linux/arcdevice.h
@@ -0,0 +1,342 @@
+/*
+ * 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 */