1#define RCS_ID "$Id: scc.c,v 1.75 1998/11/04 15:15:01 jreuter Exp jreuter $"
   2
   3#define VERSION "3.0"
   4
   5/*
   6 * Please use z8530drv-utils-3.0 with this version.
   7 *            ------------------
   8 *
   9 * You can find a subset of the documentation in 
  10 * Documentation/networking/z8530drv.txt.
  11 */
  12
  13/*
  14   ********************************************************************
  15   *   SCC.C - Linux driver for Z8530 based HDLC cards for AX.25      *
  16   ********************************************************************
  17
  18
  19   ********************************************************************
  20
  21	Copyright (c) 1993, 2000 Joerg Reuter DL1BKE
  22
  23	portions (c) 1993 Guido ten Dolle PE1NNZ
  24
  25   ********************************************************************
  26   
  27   The driver and the programs in the archive are UNDER CONSTRUCTION.
  28   The code is likely to fail, and so your kernel could --- even 
  29   a whole network. 
  30
  31   This driver is intended for Amateur Radio use. If you are running it
  32   for commercial purposes, please drop me a note. I am nosy...
  33
  34   ...BUT:
  35 
  36   ! You  m u s t  recognize the appropriate legislations of your country !
  37   ! before you connect a radio to the SCC board and start to transmit or !
  38   ! receive. The GPL allows you to use the  d r i v e r,  NOT the RADIO! !
  39
  40   For non-Amateur-Radio use please note that you might need a special
  41   allowance/licence from the designer of the SCC Board and/or the
  42   MODEM. 
  43
  44   This program is free software; you can redistribute it and/or modify 
  45   it under the terms of the (modified) GNU General Public License 
  46   delivered with the Linux kernel source.
  47   
  48   This program is distributed in the hope that it will be useful,
  49   but WITHOUT ANY WARRANTY; without even the implied warranty of
  50   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  51   GNU General Public License for more details.
  52
  53   You should find a copy of the GNU General Public License in 
  54   /usr/src/linux/COPYING; 
  55   
  56   ******************************************************************** 
  57
  58		
  59   Incomplete history of z8530drv:
  60   -------------------------------
  61
  62   1994-09-13	started to write the driver, rescued most of my own
  63		code (and Hans Alblas' memory buffer pool concept) from 
  64		an earlier project "sccdrv" which was initiated by 
  65		Guido ten Dolle. Not much of the old driver survived, 
  66		though. The first version I put my hands on was sccdrv1.3
  67		from August 1993. The memory buffer pool concept
  68		appeared in an unauthorized sccdrv version (1.5) from
  69		August 1994.
  70
  71   1995-01-31	changed copyright notice to GPL without limitations.
  72   
  73     .
  74     .	<SNIP>
  75     .
  76   		  
  77   1996-10-05	New semester, new driver... 
  78
  79   		  * KISS TNC emulator removed (TTY driver)
  80   		  * Source moved to drivers/net/
  81   		  * Includes Z8530 defines from drivers/net/z8530.h
  82   		  * Uses sk_buffer memory management
  83   		  * Reduced overhead of /proc/net/z8530drv output
  84   		  * Streamlined quite a lot things
  85   		  * Invents brand new bugs... ;-)
  86
  87   		  The move to version number 3.0 reflects theses changes.
  88   		  You can use 'kissbridge' if you need a KISS TNC emulator.
  89
  90   1996-12-13	Fixed for Linux networking changes. (G4KLX)
  91   1997-01-08	Fixed the remaining problems.
  92   1997-04-02	Hopefully fixed the problems with the new *_timer()
  93   		routines, added calibration code.
  94   1997-10-12	Made SCC_DELAY a CONFIG option, added CONFIG_SCC_TRXECHO
  95   1998-01-29	Small fix to avoid lock-up on initialization
  96   1998-09-29	Fixed the "grouping" bugs, tx_inhibit works again,
  97   		using dev->tx_queue_len now instead of MAXQUEUE now.
  98   1998-10-21	Postponed the spinlock changes, would need a lot of
  99   		testing I currently don't have the time to. Softdcd doesn't
 100   		work.
 101   1998-11-04	Softdcd does not work correctly in DPLL mode, in fact it 
 102   		never did. The DPLL locks on noise, the SYNC unit sees
 103   		flags that aren't... Restarting the DPLL does not help
 104   		either, it resynchronizes too slow and the first received
 105   		frame gets lost.
 106   2000-02-13	Fixed for new network driver interface changes, still
 107   		does TX timeouts itself since it uses its own queue
 108   		scheme.
 109
 110   Thanks to all who contributed to this driver with ideas and bug
 111   reports!
 112   
 113   NB -- if you find errors, change something, please let me know
 114      	 first before you distribute it... And please don't touch
 115   	 the version number. Just replace my callsign in
 116   	 "v3.0.dl1bke" with your own. Just to avoid confusion...
 117
 118   If you want to add your modification to the linux distribution
 119   please (!) contact me first.
 120   
 121   New versions of the driver will be announced on the linux-hams
 122   mailing list on vger.kernel.org. To subscribe send an e-mail
 123   to majordomo@vger.kernel.org with the following line in
 124   the body of the mail:
 125   
 126	   subscribe linux-hams
 127	   
 128   The content of the "Subject" field will be ignored.
 129
 130   vy 73,
 131   Joerg Reuter	ampr-net: dl1bke@db0pra.ampr.org
 132		AX-25   : DL1BKE @ DB0ABH.#BAY.DEU.EU
 133		Internet: jreuter@yaina.de
 134		www     : http://yaina.de/jreuter
 135*/
 136
 137/* ----------------------------------------------------------------------- */
 138
 139#undef  SCC_LDELAY		/* slow it even a bit more down */
 140#undef  SCC_DONT_CHECK		/* don't look if the SCCs you specified are available */
 141
 142#define SCC_MAXCHIPS	4       /* number of max. supported chips */
 143#define SCC_BUFSIZE	384     /* must not exceed 4096 */
 144#undef	SCC_DEBUG
 145
 146#define SCC_DEFAULT_CLOCK	4915200 
 147				/* default pclock if nothing is specified */
 148
 149/* ----------------------------------------------------------------------- */
 150
 151#include <linux/module.h>
 152#include <linux/errno.h>
 153#include <linux/signal.h>
 154#include <linux/timer.h>
 155#include <linux/interrupt.h>
 156#include <linux/ioport.h>
 157#include <linux/string.h>
 158#include <linux/in.h>
 159#include <linux/fcntl.h>
 160#include <linux/ptrace.h>
 161#include <linux/delay.h>
 162#include <linux/skbuff.h>
 163#include <linux/netdevice.h>
 164#include <linux/rtnetlink.h>
 165#include <linux/if_ether.h>
 166#include <linux/if_arp.h>
 167#include <linux/socket.h>
 168#include <linux/init.h>
 169#include <linux/scc.h>
 170#include <linux/ctype.h>
 171#include <linux/kernel.h>
 172#include <linux/proc_fs.h>
 173#include <linux/seq_file.h>
 174#include <linux/bitops.h>
 175
 176#include <net/net_namespace.h>
 177#include <net/ax25.h>
 178
 179#include <asm/irq.h>
 
 180#include <asm/io.h>
 181#include <linux/uaccess.h>
 182
 183#include "z8530.h"
 184
 185static const char banner[] __initconst = KERN_INFO \
 186	"AX.25: Z8530 SCC driver version "VERSION".dl1bke\n";
 187
 188static void t_dwait(unsigned long);
 189static void t_txdelay(unsigned long);
 190static void t_tail(unsigned long);
 191static void t_busy(unsigned long);
 192static void t_maxkeyup(unsigned long);
 193static void t_idle(unsigned long);
 194static void scc_tx_done(struct scc_channel *);
 195static void scc_start_tx_timer(struct scc_channel *, void (*)(unsigned long), unsigned long);
 196static void scc_start_maxkeyup(struct scc_channel *);
 197static void scc_start_defer(struct scc_channel *);
 198
 199static void z8530_init(void);
 200
 201static void init_channel(struct scc_channel *scc);
 202static void scc_key_trx (struct scc_channel *scc, char tx);
 203static void scc_init_timer(struct scc_channel *scc);
 204
 205static int scc_net_alloc(const char *name, struct scc_channel *scc);
 206static void scc_net_setup(struct net_device *dev);
 207static int scc_net_open(struct net_device *dev);
 208static int scc_net_close(struct net_device *dev);
 209static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb);
 210static netdev_tx_t scc_net_tx(struct sk_buff *skb,
 211			      struct net_device *dev);
 212static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 213static int scc_net_set_mac_address(struct net_device *dev, void *addr);
 214static struct net_device_stats * scc_net_get_stats(struct net_device *dev);
 215
 216static unsigned char SCC_DriverName[] = "scc";
 217
 218static struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS];
 219	
 220static struct scc_channel SCC_Info[2 * SCC_MAXCHIPS];	/* information per channel */
 221
 222static struct scc_ctrl {
 223	io_port chan_A;
 224	io_port chan_B;
 225	int irq;
 226} SCC_ctrl[SCC_MAXCHIPS+1];
 227
 228static unsigned char Driver_Initialized;
 229static int Nchips;
 230static io_port Vector_Latch;
 231
 232
 233/* ******************************************************************** */
 234/* *			Port Access Functions			      * */
 235/* ******************************************************************** */
 236
 237/* These provide interrupt save 2-step access to the Z8530 registers */
 238
 239static DEFINE_SPINLOCK(iolock);	/* Guards paired accesses */
 240
 241static inline unsigned char InReg(io_port port, unsigned char reg)
 242{
 243	unsigned long flags;
 244	unsigned char r;
 245
 246	spin_lock_irqsave(&iolock, flags);	
 247#ifdef SCC_LDELAY
 248	Outb(port, reg);
 249	udelay(SCC_LDELAY);
 250	r=Inb(port);
 251	udelay(SCC_LDELAY);
 252#else
 253	Outb(port, reg);
 254	r=Inb(port);
 255#endif
 256	spin_unlock_irqrestore(&iolock, flags);
 257	return r;
 258}
 259
 260static inline void OutReg(io_port port, unsigned char reg, unsigned char val)
 261{
 262	unsigned long flags;
 263
 264	spin_lock_irqsave(&iolock, flags);
 265#ifdef SCC_LDELAY
 266	Outb(port, reg); udelay(SCC_LDELAY);
 267	Outb(port, val); udelay(SCC_LDELAY);
 268#else
 269	Outb(port, reg);
 270	Outb(port, val);
 271#endif
 272	spin_unlock_irqrestore(&iolock, flags);
 273}
 274
 275static inline void wr(struct scc_channel *scc, unsigned char reg,
 276	unsigned char val)
 277{
 278	OutReg(scc->ctrl, reg, (scc->wreg[reg] = val));
 279}
 280
 281static inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val)
 282{
 283	OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val));
 284}
 285
 286static inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val)
 287{
 288	OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val));
 289}
 290
 291/* ******************************************************************** */
 292/* *			Some useful macros			      * */
 293/* ******************************************************************** */
 294
 295static inline void scc_discard_buffers(struct scc_channel *scc)
 296{
 297	unsigned long flags;
 298	
 299	spin_lock_irqsave(&scc->lock, flags);	
 300	if (scc->tx_buff != NULL)
 301	{
 302		dev_kfree_skb(scc->tx_buff);
 303		scc->tx_buff = NULL;
 304	}
 305	
 306	while (!skb_queue_empty(&scc->tx_queue))
 307		dev_kfree_skb(skb_dequeue(&scc->tx_queue));
 308
 309	spin_unlock_irqrestore(&scc->lock, flags);
 310}
 311
 312
 313
 314/* ******************************************************************** */
 315/* *			Interrupt Service Routines		      * */
 316/* ******************************************************************** */
 317
 318
 319/* ----> subroutines for the interrupt handlers <---- */
 320
 321static inline void scc_notify(struct scc_channel *scc, int event)
 322{
 323	struct sk_buff *skb;
 324	char *bp;
 325	
 326        if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA)
 327		return;
 328
 329	skb = dev_alloc_skb(2);
 330	if (skb != NULL)
 331	{
 332		bp = skb_put(skb, 2);
 333		*bp++ = PARAM_HWEVENT;
 334		*bp++ = event;
 335		scc_net_rx(scc, skb);
 336	} else
 337		scc->stat.nospace++;
 338}
 339
 340static inline void flush_rx_FIFO(struct scc_channel *scc)
 341{
 342	int k;
 343	
 344	for (k=0; k<3; k++)
 345		Inb(scc->data);
 346		
 347	if(scc->rx_buff != NULL)		/* did we receive something? */
 348	{
 349		scc->stat.rxerrs++;  /* then count it as an error */
 350		dev_kfree_skb_irq(scc->rx_buff);
 351		scc->rx_buff = NULL;
 352	}
 353}
 354
 355static void start_hunt(struct scc_channel *scc)
 356{
 357	if ((scc->modem.clocksrc != CLK_EXTERNAL))
 358		OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
 359	or(scc,R3,ENT_HM|RxENABLE);  /* enable the receiver, hunt mode */
 360}
 361
 362/* ----> four different interrupt handlers for Tx, Rx, changing of	*/
 363/*       DCD/CTS and Rx/Tx errors					*/
 364
 365/* Transmitter interrupt handler */
 366static inline void scc_txint(struct scc_channel *scc)
 367{
 368	struct sk_buff *skb;
 369
 370	scc->stat.txints++;
 371	skb = scc->tx_buff;
 372	
 373	/* send first octet */
 374	
 375	if (skb == NULL)
 376	{
 377		skb = skb_dequeue(&scc->tx_queue);
 378		scc->tx_buff = skb;
 379		netif_wake_queue(scc->dev);
 380
 381		if (skb == NULL)
 382		{
 383			scc_tx_done(scc);
 384			Outb(scc->ctrl, RES_Tx_P);
 385			return;
 386		}
 387		
 388		if (skb->len == 0)		/* Paranoia... */
 389		{
 390			dev_kfree_skb_irq(skb);
 391			scc->tx_buff = NULL;
 392			scc_tx_done(scc);
 393			Outb(scc->ctrl, RES_Tx_P);
 394			return;
 395		}
 396
 397		scc->stat.tx_state = TXS_ACTIVE;
 398
 399		OutReg(scc->ctrl, R0, RES_Tx_CRC);
 400						/* reset CRC generator */
 401		or(scc,R10,ABUNDER);		/* re-install underrun protection */
 402		Outb(scc->data,*skb->data);	/* send byte */
 403		skb_pull(skb, 1);
 404
 405		if (!scc->enhanced)		/* reset EOM latch */
 406			Outb(scc->ctrl,RES_EOM_L);
 407		return;
 408	}
 409	
 410	/* End Of Frame... */
 411	
 412	if (skb->len == 0)
 413	{
 414		Outb(scc->ctrl, RES_Tx_P);	/* reset pending int */
 415		cl(scc, R10, ABUNDER);		/* send CRC */
 416		dev_kfree_skb_irq(skb);
 417		scc->tx_buff = NULL;
 418		scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */
 419		return;
 420	} 
 421	
 422	/* send octet */
 423	
 424	Outb(scc->data,*skb->data);		
 425	skb_pull(skb, 1);
 426}
 427
 428
 429/* External/Status interrupt handler */
 430static inline void scc_exint(struct scc_channel *scc)
 431{
 432	unsigned char status,changes,chg_and_stat;
 433
 434	scc->stat.exints++;
 435
 436	status = InReg(scc->ctrl,R0);
 437	changes = status ^ scc->status;
 438	chg_and_stat = changes & status;
 439	
 440	/* ABORT: generated whenever DCD drops while receiving */
 441
 442	if (chg_and_stat & BRK_ABRT)		/* Received an ABORT */
 443		flush_rx_FIFO(scc);
 444
 445	/* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */
 446
 447	if ((changes & SYNC_HUNT) && scc->kiss.softdcd)
 448	{
 449		if (status & SYNC_HUNT)
 450		{
 451			scc->dcd = 0;
 452			flush_rx_FIFO(scc);
 453			if ((scc->modem.clocksrc != CLK_EXTERNAL))
 454				OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
 455		} else {
 456			scc->dcd = 1;
 457		}
 458
 459		scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON);
 460	}
 461
 462	/* DCD: on = start to receive packet, off = ABORT condition */
 463	/* (a successfully received packet generates a special condition int) */
 464	
 465	if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */
 466	{
 467		if(status & DCD)                /* DCD is now ON */
 468		{
 469			start_hunt(scc);
 470			scc->dcd = 1;
 471		} else {                        /* DCD is now OFF */
 472			cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */
 473			flush_rx_FIFO(scc);
 474			scc->dcd = 0;
 475		}
 476		
 477		scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
 478	}
 479
 480#ifdef notdef
 481	/* CTS: use external TxDelay (what's that good for?!)
 482	 * Anyway: If we _could_ use it (BayCom USCC uses CTS for
 483	 * own purposes) we _should_ use the "autoenable" feature
 484	 * of the Z8530 and not this interrupt...
 485	 */
 486	 
 487	if (chg_and_stat & CTS)			/* CTS is now ON */
 488	{
 489		if (scc->kiss.txdelay == 0)	/* zero TXDELAY = wait for CTS */
 490			scc_start_tx_timer(scc, t_txdelay, 0);
 491	}
 492#endif
 493	
 494	if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM))
 495	{
 496		scc->stat.tx_under++;	  /* oops, an underrun! count 'em */
 497		Outb(scc->ctrl, RES_EXT_INT);	/* reset ext/status interrupts */
 498
 499		if (scc->tx_buff != NULL)
 500		{
 501			dev_kfree_skb_irq(scc->tx_buff);
 502			scc->tx_buff = NULL;
 503		}
 504		
 505		or(scc,R10,ABUNDER);
 506		scc_start_tx_timer(scc, t_txdelay, 0);	/* restart transmission */
 507	}
 508		
 509	scc->status = status;
 510	Outb(scc->ctrl,RES_EXT_INT);
 511}
 512
 513
 514/* Receiver interrupt handler */
 515static inline void scc_rxint(struct scc_channel *scc)
 516{
 517	struct sk_buff *skb;
 518
 519	scc->stat.rxints++;
 520
 521	if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF)
 522	{
 523		Inb(scc->data);		/* discard char */
 524		or(scc,R3,ENT_HM);	/* enter hunt mode for next flag */
 525		return;
 526	}
 527
 528	skb = scc->rx_buff;
 529	
 530	if (skb == NULL)
 531	{
 532		skb = dev_alloc_skb(scc->stat.bufsize);
 533		if (skb == NULL)
 534		{
 535			scc->dev_stat.rx_dropped++;
 536			scc->stat.nospace++;
 537			Inb(scc->data);
 538			or(scc, R3, ENT_HM);
 539			return;
 540		}
 541		
 542		scc->rx_buff = skb;
 543		*(skb_put(skb, 1)) = 0;	/* KISS data */
 544	}
 545	
 546	if (skb->len >= scc->stat.bufsize)
 547	{
 548#ifdef notdef
 549		printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n");
 550#endif
 551		dev_kfree_skb_irq(skb);
 552		scc->rx_buff = NULL;
 553		Inb(scc->data);
 554		or(scc, R3, ENT_HM);
 555		return;
 556	}
 557
 558	*(skb_put(skb, 1)) = Inb(scc->data);
 559}
 560
 561
 562/* Receive Special Condition interrupt handler */
 563static inline void scc_spint(struct scc_channel *scc)
 564{
 565	unsigned char status;
 566	struct sk_buff *skb;
 567
 568	scc->stat.spints++;
 569
 570	status = InReg(scc->ctrl,R1);		/* read receiver status */
 571	
 572	Inb(scc->data);				/* throw away Rx byte */
 573	skb = scc->rx_buff;
 574
 575	if(status & Rx_OVR)			/* receiver overrun */
 576	{
 577		scc->stat.rx_over++;             /* count them */
 578		or(scc,R3,ENT_HM);               /* enter hunt mode for next flag */
 579		
 580		if (skb != NULL) 
 581			dev_kfree_skb_irq(skb);
 582		scc->rx_buff = skb = NULL;
 583	}
 584
 585	if(status & END_FR && skb != NULL)	/* end of frame */
 586	{
 587		/* CRC okay, frame ends on 8 bit boundary and received something ? */
 588		
 589		if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0)
 590		{
 591			/* ignore last received byte (first of the CRC bytes) */
 592			skb_trim(skb, skb->len-1);
 593			scc_net_rx(scc, skb);
 594			scc->rx_buff = NULL;
 595			scc->stat.rxframes++;
 596		} else {				/* a bad frame */
 597			dev_kfree_skb_irq(skb);
 598			scc->rx_buff = NULL;
 599			scc->stat.rxerrs++;
 600		}
 601	} 
 602
 603	Outb(scc->ctrl,ERR_RES);
 604}
 605
 606
 607/* ----> interrupt service routine for the Z8530 <---- */
 608
 609static void scc_isr_dispatch(struct scc_channel *scc, int vector)
 610{
 611	spin_lock(&scc->lock);
 612	switch (vector & VECTOR_MASK)
 613	{
 614		case TXINT: scc_txint(scc); break;
 615		case EXINT: scc_exint(scc); break;
 616		case RXINT: scc_rxint(scc); break;
 617		case SPINT: scc_spint(scc); break;
 618	}
 619	spin_unlock(&scc->lock);
 620}
 621
 622/* If the card has a latch for the interrupt vector (like the PA0HZP card)
 623   use it to get the number of the chip that generated the int.
 624   If not: poll all defined chips.
 625 */
 626
 627#define SCC_IRQTIMEOUT 30000
 628
 629static irqreturn_t scc_isr(int irq, void *dev_id)
 630{
 631	int chip_irq = (long) dev_id;
 632	unsigned char vector;	
 633	struct scc_channel *scc;
 634	struct scc_ctrl *ctrl;
 635	int k;
 636	
 637	if (Vector_Latch)
 638	{
 639	    	for(k=0; k < SCC_IRQTIMEOUT; k++)
 640    		{
 641			Outb(Vector_Latch, 0);      /* Generate INTACK */
 642        
 643			/* Read the vector */
 644			if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break; 
 645			if (vector & 0x01) break;
 646        	 
 647		        scc=&SCC_Info[vector >> 3 ^ 0x01];
 648			if (!scc->dev) break;
 649
 650			scc_isr_dispatch(scc, vector);
 651
 652			OutReg(scc->ctrl,R0,RES_H_IUS);              /* Reset Highest IUS */
 653		}  
 654
 655		if (k == SCC_IRQTIMEOUT)
 656			printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n");
 657
 658		return IRQ_HANDLED;
 659	}
 660
 661	/* Find the SCC generating the interrupt by polling all attached SCCs
 662	 * reading RR3A (the interrupt pending register)
 663	 */
 664
 665	ctrl = SCC_ctrl;
 666	while (ctrl->chan_A)
 667	{
 668		if (ctrl->irq != chip_irq)
 669		{
 670			ctrl++;
 671			continue;
 672		}
 673
 674		scc = NULL;
 675		for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++)
 676		{
 677			vector=InReg(ctrl->chan_B,R2);	/* Read the vector */
 678			if (vector & 0x01) break; 
 679
 680			scc = &SCC_Info[vector >> 3 ^ 0x01];
 681		        if (!scc->dev) break;
 682
 683			scc_isr_dispatch(scc, vector);
 684		}
 685
 686		if (k == SCC_IRQTIMEOUT)
 687		{
 688			printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n");
 689			break;
 690		}
 691
 692		/* This looks weird and it is. At least the BayCom USCC doesn't
 693		 * use the Interrupt Daisy Chain, thus we'll have to start
 694		 * all over again to be sure not to miss an interrupt from 
 695		 * (any of) the other chip(s)...
 696		 * Honestly, the situation *is* braindamaged...
 697		 */
 698
 699		if (scc != NULL)
 700		{
 701			OutReg(scc->ctrl,R0,RES_H_IUS);
 702			ctrl = SCC_ctrl; 
 703		} else
 704			ctrl++;
 705	}
 706	return IRQ_HANDLED;
 707}
 708
 709
 710
 711/* ******************************************************************** */
 712/* *			Init Channel					*/
 713/* ******************************************************************** */
 714
 715
 716/* ----> set SCC channel speed <---- */
 717
 718static inline void set_brg(struct scc_channel *scc, unsigned int tc)
 719{
 720	cl(scc,R14,BRENABL);		/* disable baudrate generator */
 721	wr(scc,R12,tc & 255);		/* brg rate LOW */
 722	wr(scc,R13,tc >> 8);   		/* brg rate HIGH */
 723	or(scc,R14,BRENABL);		/* enable baudrate generator */
 724}
 725
 726static inline void set_speed(struct scc_channel *scc)
 727{
 728	unsigned long flags;
 729	spin_lock_irqsave(&scc->lock, flags);
 730
 731	if (scc->modem.speed > 0)	/* paranoia... */
 732		set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2);
 733		
 734	spin_unlock_irqrestore(&scc->lock, flags);
 735}
 736
 737
 738/* ----> initialize a SCC channel <---- */
 739
 740static inline void init_brg(struct scc_channel *scc)
 741{
 742	wr(scc, R14, BRSRC);				/* BRG source = PCLK */
 743	OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]);	/* DPLL source = BRG */
 744	OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]);	/* DPLL NRZI mode */
 745}
 746
 747/*
 748 * Initialization according to the Z8530 manual (SGS-Thomson's version):
 749 *
 750 * 1. Modes and constants
 751 *
 752 * WR9	11000000	chip reset
 753 * WR4	XXXXXXXX	Tx/Rx control, async or sync mode
 754 * WR1	0XX00X00	select W/REQ (optional)
 755 * WR2	XXXXXXXX	program interrupt vector
 756 * WR3	XXXXXXX0	select Rx control
 757 * WR5	XXXX0XXX	select Tx control
 758 * WR6	XXXXXXXX	sync character
 759 * WR7	XXXXXXXX	sync character
 760 * WR9	000X0XXX	select interrupt control
 761 * WR10	XXXXXXXX	miscellaneous control (optional)
 762 * WR11	XXXXXXXX	clock control
 763 * WR12	XXXXXXXX	time constant lower byte (optional)
 764 * WR13	XXXXXXXX	time constant upper byte (optional)
 765 * WR14	XXXXXXX0	miscellaneous control
 766 * WR14	XXXSSSSS	commands (optional)
 767 *
 768 * 2. Enables
 769 *
 770 * WR14	000SSSS1	baud rate enable
 771 * WR3	SSSSSSS1	Rx enable
 772 * WR5	SSSS1SSS	Tx enable
 773 * WR0	10000000	reset Tx CRG (optional)
 774 * WR1	XSS00S00	DMA enable (optional)
 775 *
 776 * 3. Interrupt status
 777 *
 778 * WR15	XXXXXXXX	enable external/status
 779 * WR0	00010000	reset external status
 780 * WR0	00010000	reset external status twice
 781 * WR1	SSSXXSXX	enable Rx, Tx and Ext/status
 782 * WR9	000SXSSS	enable master interrupt enable
 783 *
 784 * 1 = set to one, 0 = reset to zero
 785 * X = user defined, S = same as previous init
 786 *
 787 *
 788 * Note that the implementation differs in some points from above scheme.
 789 *
 790 */
 791 
 792static void init_channel(struct scc_channel *scc)
 793{
 794	del_timer(&scc->tx_t);
 795	del_timer(&scc->tx_wdog);
 796
 797	disable_irq(scc->irq);
 798
 799	wr(scc,R4,X1CLK|SDLC);		/* *1 clock, SDLC mode */
 800	wr(scc,R1,0);			/* no W/REQ operation */
 801	wr(scc,R3,Rx8|RxCRC_ENAB);	/* RX 8 bits/char, CRC, disabled */	
 802	wr(scc,R5,Tx8|DTR|TxCRC_ENAB);	/* TX 8 bits/char, disabled, DTR */
 803	wr(scc,R6,0);			/* SDLC address zero (not used) */
 804	wr(scc,R7,FLAG);		/* SDLC flag value */
 805	wr(scc,R9,VIS);			/* vector includes status */
 806	wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */
 807	wr(scc,R14, 0);
 808
 809
 810/* set clock sources:
 811
 812   CLK_DPLL: normal halfduplex operation
 813   
 814		RxClk: use DPLL
 815		TxClk: use DPLL
 816		TRxC mode DPLL output
 817		
 818   CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem)
 819   
 820  	        BayCom: 		others:
 821  	        
 822  	        TxClk = pin RTxC	TxClk = pin TRxC
 823  	        RxClk = pin TRxC 	RxClk = pin RTxC
 824  	     
 825
 826   CLK_DIVIDER:
 827   		RxClk = use DPLL
 828   		TxClk = pin RTxC
 829   		
 830   		BayCom:			others:
 831   		pin TRxC = DPLL		pin TRxC = BRG
 832   		(RxClk * 1)		(RxClk * 32)
 833*/  
 834
 835   		
 836	switch(scc->modem.clocksrc)
 837	{
 838		case CLK_DPLL:
 839			wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
 840			init_brg(scc);
 841			break;
 842
 843		case CLK_DIVIDER:
 844			wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI);
 845			init_brg(scc);
 846			break;
 847
 848		case CLK_EXTERNAL:
 849			wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP);
 850			OutReg(scc->ctrl, R14, DISDPLL);
 851			break;
 852
 853	}
 854	
 855	set_speed(scc);			/* set baudrate */
 856	
 857	if(scc->enhanced)
 858	{
 859		or(scc,R15,SHDLCE|FIFOE);	/* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */
 860		wr(scc,R7,AUTOEOM);
 861	}
 862
 863	if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD))
 864						/* DCD is now ON */
 865	{
 866		start_hunt(scc);
 867	}
 868	
 869	/* enable ABORT, DCD & SYNC/HUNT interrupts */
 870
 871	wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE));
 872
 873	Outb(scc->ctrl,RES_EXT_INT);	/* reset ext/status interrupts */
 874	Outb(scc->ctrl,RES_EXT_INT);	/* must be done twice */
 875
 876	or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */
 877	
 878	scc->status = InReg(scc->ctrl,R0);	/* read initial status */
 879	
 880	or(scc,R9,MIE);			/* master interrupt enable */
 881	
 882	scc_init_timer(scc);
 883			
 884	enable_irq(scc->irq);
 885}
 886
 887
 888
 889
 890/* ******************************************************************** */
 891/* *			SCC timer functions			      * */
 892/* ******************************************************************** */
 893
 894
 895/* ----> scc_key_trx sets the time constant for the baudrate 
 896         generator and keys the transmitter		     <---- */
 897
 898static void scc_key_trx(struct scc_channel *scc, char tx)
 899{
 900	unsigned int time_const;
 901		
 902	if (scc->brand & PRIMUS)
 903		Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0));
 904
 905	if (scc->modem.speed < 300) 
 906		scc->modem.speed = 1200;
 907
 908	time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2;
 909
 910	disable_irq(scc->irq);
 911
 912	if (tx)
 913	{
 914		or(scc, R1, TxINT_ENAB);	/* t_maxkeyup may have reset these */
 915		or(scc, R15, TxUIE);
 916	}
 917
 918	if (scc->modem.clocksrc == CLK_DPLL)
 919	{				/* force simplex operation */
 920		if (tx)
 921		{
 922#ifdef CONFIG_SCC_TRXECHO
 923			cl(scc, R3, RxENABLE|ENT_HM);	/* switch off receiver */
 924			cl(scc, R15, DCDIE|SYNCIE);	/* No DCD changes, please */
 925#endif
 926			set_brg(scc, time_const);	/* reprogram baudrate generator */
 927
 928			/* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */
 929			wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR);
 930			
 931			/* By popular demand: tx_inhibit */
 932			if (scc->kiss.tx_inhibit)
 933			{
 934				or(scc,R5, TxENAB);
 935				scc->wreg[R5] |= RTS;
 936			} else {
 937				or(scc,R5,RTS|TxENAB);	/* set the RTS line and enable TX */
 938			}
 939		} else {
 940			cl(scc,R5,RTS|TxENAB);
 941			
 942			set_brg(scc, time_const);	/* reprogram baudrate generator */
 943			
 944			/* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */
 945			wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
 946
 947#ifndef CONFIG_SCC_TRXECHO
 948			if (scc->kiss.softdcd)
 949#endif
 950			{
 951				or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE);
 952				start_hunt(scc);
 953			}
 954		}
 955	} else {
 956		if (tx)
 957		{
 958#ifdef CONFIG_SCC_TRXECHO
 959			if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
 960			{
 961				cl(scc, R3, RxENABLE);
 962				cl(scc, R15, DCDIE|SYNCIE);
 963			}
 964#endif
 965				
 966			if (scc->kiss.tx_inhibit)
 967			{
 968				or(scc,R5, TxENAB);
 969				scc->wreg[R5] |= RTS;
 970			} else {	
 971				or(scc,R5,RTS|TxENAB);	/* enable tx */
 972			}
 973		} else {
 974			cl(scc,R5,RTS|TxENAB);		/* disable tx */
 975
 976			if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) &&
 977#ifndef CONFIG_SCC_TRXECHO
 978			    scc->kiss.softdcd)
 979#else
 980			    1)
 981#endif
 982			{
 983				or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE);
 984				start_hunt(scc);
 985			}
 986		}
 987	}
 988
 989	enable_irq(scc->irq);
 990}
 991
 992
 993/* ----> SCC timer interrupt handler and friends. <---- */
 994
 995static void __scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
 996{
 997	del_timer(&scc->tx_t);
 998
 999	if (when == 0)
1000	{
1001		handler((unsigned long) scc);
1002	} else 
1003	if (when != TIMER_OFF)
1004	{
1005		scc->tx_t.data = (unsigned long) scc;
1006		scc->tx_t.function = handler;
1007		scc->tx_t.expires = jiffies + (when*HZ)/100;
1008		add_timer(&scc->tx_t);
1009	}
1010}
1011
1012static void scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
1013{
1014	unsigned long flags;
1015	
1016	spin_lock_irqsave(&scc->lock, flags);
1017	__scc_start_tx_timer(scc, handler, when);
1018	spin_unlock_irqrestore(&scc->lock, flags);
1019}
1020
1021static void scc_start_defer(struct scc_channel *scc)
1022{
1023	unsigned long flags;
1024	
1025	spin_lock_irqsave(&scc->lock, flags);
1026	del_timer(&scc->tx_wdog);
1027	
1028	if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF)
1029	{
1030		scc->tx_wdog.data = (unsigned long) scc;
1031		scc->tx_wdog.function = t_busy;
1032		scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer;
1033		add_timer(&scc->tx_wdog);
1034	}
1035	spin_unlock_irqrestore(&scc->lock, flags);
1036}
1037
1038static void scc_start_maxkeyup(struct scc_channel *scc)
1039{
1040	unsigned long flags;
1041	
1042	spin_lock_irqsave(&scc->lock, flags);
1043	del_timer(&scc->tx_wdog);
1044	
1045	if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF)
1046	{
1047		scc->tx_wdog.data = (unsigned long) scc;
1048		scc->tx_wdog.function = t_maxkeyup;
1049		scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup;
1050		add_timer(&scc->tx_wdog);
1051	}
1052	spin_unlock_irqrestore(&scc->lock, flags);
1053}
1054
1055/* 
1056 * This is called from scc_txint() when there are no more frames to send.
1057 * Not exactly a timer function, but it is a close friend of the family...
1058 */
1059
1060static void scc_tx_done(struct scc_channel *scc)
1061{
1062	/* 
1063	 * trx remains keyed in fulldup mode 2 until t_idle expires.
1064	 */
1065				 
1066	switch (scc->kiss.fulldup)
1067	{
1068		case KISS_DUPLEX_LINK:
1069			scc->stat.tx_state = TXS_IDLE2;
1070			if (scc->kiss.idletime != TIMER_OFF)
1071				scc_start_tx_timer(scc, t_idle,
1072						   scc->kiss.idletime*100);
1073			break;
1074		case KISS_DUPLEX_OPTIMA:
1075			scc_notify(scc, HWEV_ALL_SENT);
1076			break;
1077		default:
1078			scc->stat.tx_state = TXS_BUSY;
1079			scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1080	}
1081
1082	netif_wake_queue(scc->dev);
1083}
1084
1085
1086static unsigned char Rand = 17;
1087
1088static inline int is_grouped(struct scc_channel *scc)
1089{
1090	int k;
1091	struct scc_channel *scc2;
1092	unsigned char grp1, grp2;
1093
1094	grp1 = scc->kiss.group;
1095	
1096	for (k = 0; k < (Nchips * 2); k++)
1097	{
1098		scc2 = &SCC_Info[k];
1099		grp2 = scc2->kiss.group;
1100		
1101		if (scc2 == scc || !(scc2->dev && grp2))
1102			continue;
1103		
1104		if ((grp1 & 0x3f) == (grp2 & 0x3f))
1105		{
1106			if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) )
1107				return 1;
1108			
1109			if ( (grp1 & RXGROUP) && scc2->dcd )
1110				return 1;
1111		}
1112	}
1113	return 0;
1114}
1115
1116/* DWAIT and SLOTTIME expired
1117 *
1118 * fulldup == 0:  DCD is active or Rand > P-persistence: start t_busy timer
1119 *                else key trx and start txdelay
1120 * fulldup == 1:  key trx and start txdelay
1121 * fulldup == 2:  mintime expired, reset status or key trx and start txdelay
1122 */
1123
1124static void t_dwait(unsigned long channel)
1125{
1126	struct scc_channel *scc = (struct scc_channel *) channel;
1127	
1128	if (scc->stat.tx_state == TXS_WAIT)	/* maxkeyup or idle timeout */
1129	{
1130		if (skb_queue_empty(&scc->tx_queue)) {	/* nothing to send */
1131			scc->stat.tx_state = TXS_IDLE;
1132			netif_wake_queue(scc->dev);	/* t_maxkeyup locked it. */
1133			return;
1134		}
1135
1136		scc->stat.tx_state = TXS_BUSY;
1137	}
1138
1139	if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1140	{
1141		Rand = Rand * 17 + 31;
1142		
1143		if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) )
1144		{
1145			scc_start_defer(scc);
1146			scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime);
1147			return ;
1148		}
1149	}
1150
1151	if ( !(scc->wreg[R5] & RTS) )
1152	{
1153		scc_key_trx(scc, TX_ON);
1154		scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1155	} else {
1156		scc_start_tx_timer(scc, t_txdelay, 0);
1157	}
1158}
1159
1160
1161/* TXDELAY expired
1162 *
1163 * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog.
1164 */
1165
1166static void t_txdelay(unsigned long channel)
1167{
1168	struct scc_channel *scc = (struct scc_channel *) channel;
1169
1170	scc_start_maxkeyup(scc);
1171
1172	if (scc->tx_buff == NULL)
1173	{
1174		disable_irq(scc->irq);
1175		scc_txint(scc);	
1176		enable_irq(scc->irq);
1177	}
1178}
1179	
1180
1181/* TAILTIME expired
1182 *
1183 * switch off transmitter. If we were stopped by Maxkeyup restart
1184 * transmission after 'mintime' seconds
1185 */
1186
1187static void t_tail(unsigned long channel)
1188{
1189	struct scc_channel *scc = (struct scc_channel *) channel;
1190	unsigned long flags;
1191	
1192	spin_lock_irqsave(&scc->lock, flags); 
1193 	del_timer(&scc->tx_wdog);	
1194 	scc_key_trx(scc, TX_OFF);
1195	spin_unlock_irqrestore(&scc->lock, flags);
1196
1197 	if (scc->stat.tx_state == TXS_TIMEOUT)		/* we had a timeout? */
1198 	{
1199 		scc->stat.tx_state = TXS_WAIT;
1200		scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1201 		return;
1202 	}
1203 	
1204 	scc->stat.tx_state = TXS_IDLE;
1205	netif_wake_queue(scc->dev);
1206}
1207
1208
1209/* BUSY timeout
1210 *
1211 * throw away send buffers if DCD remains active too long.
1212 */
1213
1214static void t_busy(unsigned long channel)
1215{
1216	struct scc_channel *scc = (struct scc_channel *) channel;
1217
1218	del_timer(&scc->tx_t);
1219	netif_stop_queue(scc->dev);	/* don't pile on the wabbit! */
1220
1221	scc_discard_buffers(scc);
1222	scc->stat.txerrs++;
1223	scc->stat.tx_state = TXS_IDLE;
1224
1225	netif_wake_queue(scc->dev);	
1226}
1227
1228/* MAXKEYUP timeout
1229 *
1230 * this is our watchdog.
1231 */
1232
1233static void t_maxkeyup(unsigned long channel)
1234{
1235	struct scc_channel *scc = (struct scc_channel *) channel;
1236	unsigned long flags;
1237
1238	spin_lock_irqsave(&scc->lock, flags);
1239	/* 
1240	 * let things settle down before we start to
1241	 * accept new data.
1242	 */
1243
1244	netif_stop_queue(scc->dev);
1245	scc_discard_buffers(scc);
1246
1247	del_timer(&scc->tx_t);
1248
1249	cl(scc, R1, TxINT_ENAB);	/* force an ABORT, but don't */
1250	cl(scc, R15, TxUIE);		/* count it. */
1251	OutReg(scc->ctrl, R0, RES_Tx_P);
1252
1253	spin_unlock_irqrestore(&scc->lock, flags);
1254
1255	scc->stat.txerrs++;
1256	scc->stat.tx_state = TXS_TIMEOUT;
1257	scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1258}
1259
1260/* IDLE timeout
1261 *
1262 * in fulldup mode 2 it keys down the transmitter after 'idle' seconds
1263 * of inactivity. We will not restart transmission before 'mintime'
1264 * expires.
1265 */
1266
1267static void t_idle(unsigned long channel)
1268{
1269	struct scc_channel *scc = (struct scc_channel *) channel;
1270	
1271	del_timer(&scc->tx_wdog);
1272
1273	scc_key_trx(scc, TX_OFF);
1274	if(scc->kiss.mintime)
1275		scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1276	scc->stat.tx_state = TXS_WAIT;
1277}
1278
1279static void scc_init_timer(struct scc_channel *scc)
1280{
1281	unsigned long flags;
1282
1283	spin_lock_irqsave(&scc->lock, flags);	
1284	scc->stat.tx_state = TXS_IDLE;
1285	spin_unlock_irqrestore(&scc->lock, flags);
1286}
1287
1288
1289/* ******************************************************************** */
1290/* *			Set/get L1 parameters			      * */
1291/* ******************************************************************** */
1292
1293
1294/*
1295 * this will set the "hardware" parameters through KISS commands or ioctl()
1296 */
1297
1298#define CAST(x) (unsigned long)(x)
1299
1300static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg)
1301{
1302	switch (cmd)
1303	{
1304		case PARAM_TXDELAY:	scc->kiss.txdelay=arg;		break;
1305		case PARAM_PERSIST:	scc->kiss.persist=arg;		break;
1306		case PARAM_SLOTTIME:	scc->kiss.slottime=arg;		break;
1307		case PARAM_TXTAIL:	scc->kiss.tailtime=arg;		break;
1308		case PARAM_FULLDUP:	scc->kiss.fulldup=arg;		break;
1309		case PARAM_DTR:		break; /* does someone need this? */
1310		case PARAM_GROUP:	scc->kiss.group=arg;		break;
1311		case PARAM_IDLE:	scc->kiss.idletime=arg;		break;
1312		case PARAM_MIN:		scc->kiss.mintime=arg;		break;
1313		case PARAM_MAXKEY:	scc->kiss.maxkeyup=arg;		break;
1314		case PARAM_WAIT:	scc->kiss.waittime=arg;		break;
1315		case PARAM_MAXDEFER:	scc->kiss.maxdefer=arg;		break;
1316		case PARAM_TX:		scc->kiss.tx_inhibit=arg;	break;
1317
1318		case PARAM_SOFTDCD:	
1319			scc->kiss.softdcd=arg;
1320			if (arg)
1321			{
1322				or(scc, R15, SYNCIE);
1323				cl(scc, R15, DCDIE);
1324				start_hunt(scc);
1325			} else {
1326				or(scc, R15, DCDIE);
1327				cl(scc, R15, SYNCIE);
1328			}
1329			break;
1330				
1331		case PARAM_SPEED:
1332			if (arg < 256)
1333				scc->modem.speed=arg*100;
1334			else
1335				scc->modem.speed=arg;
1336
1337			if (scc->stat.tx_state == 0)	/* only switch baudrate on rx... ;-) */
1338				set_speed(scc);
1339			break;
1340			
1341		case PARAM_RTS:	
1342			if ( !(scc->wreg[R5] & RTS) )
1343			{
1344				if (arg != TX_OFF) {
1345					scc_key_trx(scc, TX_ON);
1346					scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1347				}
1348			} else {
1349				if (arg == TX_OFF)
1350				{
1351					scc->stat.tx_state = TXS_BUSY;
1352					scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1353				}
1354			}
1355			break;
1356			
1357		case PARAM_HWEVENT:
1358			scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1359			break;
1360
1361		default:		return -EINVAL;
1362	}
1363	
1364	return 0;
1365}
1366
1367
1368 
1369static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1370{
1371	switch (cmd)
1372	{
1373		case PARAM_TXDELAY:	return CAST(scc->kiss.txdelay);
1374		case PARAM_PERSIST:	return CAST(scc->kiss.persist);
1375		case PARAM_SLOTTIME:	return CAST(scc->kiss.slottime);
1376		case PARAM_TXTAIL:	return CAST(scc->kiss.tailtime);
1377		case PARAM_FULLDUP:	return CAST(scc->kiss.fulldup);
1378		case PARAM_SOFTDCD:	return CAST(scc->kiss.softdcd);
1379		case PARAM_DTR:		return CAST((scc->wreg[R5] & DTR)? 1:0);
1380		case PARAM_RTS:		return CAST((scc->wreg[R5] & RTS)? 1:0);
1381		case PARAM_SPEED:	return CAST(scc->modem.speed);
1382		case PARAM_GROUP:	return CAST(scc->kiss.group);
1383		case PARAM_IDLE:	return CAST(scc->kiss.idletime);
1384		case PARAM_MIN:		return CAST(scc->kiss.mintime);
1385		case PARAM_MAXKEY:	return CAST(scc->kiss.maxkeyup);
1386		case PARAM_WAIT:	return CAST(scc->kiss.waittime);
1387		case PARAM_MAXDEFER:	return CAST(scc->kiss.maxdefer);
1388		case PARAM_TX:		return CAST(scc->kiss.tx_inhibit);
1389		default:		return NO_SUCH_PARAM;
1390	}
1391
1392}
1393
1394#undef CAST
1395
1396/* ******************************************************************* */
1397/* *			Send calibration pattern		     * */
1398/* ******************************************************************* */
1399
1400static void scc_stop_calibrate(unsigned long channel)
1401{
1402	struct scc_channel *scc = (struct scc_channel *) channel;
1403	unsigned long flags;
1404	
1405	spin_lock_irqsave(&scc->lock, flags);
1406	del_timer(&scc->tx_wdog);
1407	scc_key_trx(scc, TX_OFF);
1408	wr(scc, R6, 0);
1409	wr(scc, R7, FLAG);
1410	Outb(scc->ctrl,RES_EXT_INT);	/* reset ext/status interrupts */
1411	Outb(scc->ctrl,RES_EXT_INT);
1412
1413	netif_wake_queue(scc->dev);
1414	spin_unlock_irqrestore(&scc->lock, flags);
1415}
1416
1417
1418static void
1419scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1420{
1421	unsigned long flags;
1422	
1423	spin_lock_irqsave(&scc->lock, flags);
1424	netif_stop_queue(scc->dev);
1425	scc_discard_buffers(scc);
1426
1427	del_timer(&scc->tx_wdog);
1428
1429	scc->tx_wdog.data = (unsigned long) scc;
1430	scc->tx_wdog.function = scc_stop_calibrate;
1431	scc->tx_wdog.expires = jiffies + HZ*duration;
1432	add_timer(&scc->tx_wdog);
1433
1434	/* This doesn't seem to work. Why not? */	
1435	wr(scc, R6, 0);
1436	wr(scc, R7, pattern);
1437
1438	/* 
1439	 * Don't know if this works. 
1440	 * Damn, where is my Z8530 programming manual...? 
1441	 */
1442
1443	Outb(scc->ctrl,RES_EXT_INT);	/* reset ext/status interrupts */
1444	Outb(scc->ctrl,RES_EXT_INT);
1445
1446	scc_key_trx(scc, TX_ON);
1447	spin_unlock_irqrestore(&scc->lock, flags);
1448}
1449
1450/* ******************************************************************* */
1451/* *		Init channel structures, special HW, etc...	     * */
1452/* ******************************************************************* */
1453
1454/*
1455 * Reset the Z8530s and setup special hardware
1456 */
1457
1458static void z8530_init(void)
1459{
1460	struct scc_channel *scc;
1461	int chip, k;
1462	unsigned long flags;
1463	char *flag;
1464
1465
1466	printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1467	
1468	flag=" ";
1469	for (k = 0; k < nr_irqs; k++)
1470		if (Ivec[k].used) 
1471		{
1472			printk("%s%d", flag, k);
1473			flag=",";
1474		}
1475	printk("\n");
1476
1477
1478	/* reset and pre-init all chips in the system */
1479	for (chip = 0; chip < Nchips; chip++)
1480	{
1481		scc=&SCC_Info[2*chip];
1482		if (!scc->ctrl) continue;
1483
1484		/* Special SCC cards */
1485
1486		if(scc->brand & EAGLE)			/* this is an EAGLE card */
1487			Outb(scc->special,0x08);	/* enable interrupt on the board */
1488			
1489		if(scc->brand & (PC100 | PRIMUS))	/* this is a PC100/PRIMUS card */
1490			Outb(scc->special,scc->option);	/* set the MODEM mode (0x22) */
1491
1492			
1493		/* Reset and pre-init Z8530 */
1494
1495		spin_lock_irqsave(&scc->lock, flags);
1496				
1497		Outb(scc->ctrl, 0);
1498		OutReg(scc->ctrl,R9,FHWRES);		/* force hardware reset */
1499		udelay(100);				/* give it 'a bit' more time than required */
1500		wr(scc, R2, chip*16);			/* interrupt vector */
1501		wr(scc, R9, VIS);			/* vector includes status */
1502		spin_unlock_irqrestore(&scc->lock, flags);		
1503        }
1504
1505 
1506	Driver_Initialized = 1;
1507}
1508
1509/*
1510 * Allocate device structure, err, instance, and register driver
1511 */
1512
1513static int scc_net_alloc(const char *name, struct scc_channel *scc)
1514{
1515	int err;
1516	struct net_device *dev;
1517
1518	dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, scc_net_setup);
1519	if (!dev) 
1520		return -ENOMEM;
1521
1522	dev->ml_priv = scc;
1523	scc->dev = dev;
1524	spin_lock_init(&scc->lock);
1525	init_timer(&scc->tx_t);
1526	init_timer(&scc->tx_wdog);
1527
1528	err = register_netdevice(dev);
1529	if (err) {
1530		printk(KERN_ERR "%s: can't register network device (%d)\n", 
1531		       name, err);
1532		free_netdev(dev);
1533		scc->dev = NULL;
1534		return err;
1535	}
1536
1537	return 0;
1538}
1539
1540
1541
1542/* ******************************************************************** */
1543/* *			    Network driver methods		      * */
1544/* ******************************************************************** */
1545
1546static const struct net_device_ops scc_netdev_ops = {
1547	.ndo_open            = scc_net_open,
1548	.ndo_stop	     = scc_net_close,
1549	.ndo_start_xmit	     = scc_net_tx,
1550	.ndo_set_mac_address = scc_net_set_mac_address,
1551	.ndo_get_stats       = scc_net_get_stats,
1552	.ndo_do_ioctl        = scc_net_ioctl,
1553};
1554
1555/* ----> Initialize device <----- */
1556
1557static void scc_net_setup(struct net_device *dev)
1558{
1559	dev->tx_queue_len    = 16;	/* should be enough... */
1560
1561	dev->netdev_ops	     = &scc_netdev_ops;
1562	dev->header_ops      = &ax25_header_ops;
1563
1564	memcpy(dev->broadcast, &ax25_bcast,  AX25_ADDR_LEN);
1565	memcpy(dev->dev_addr,  &ax25_defaddr, AX25_ADDR_LEN);
1566 
1567	dev->flags      = 0;
1568
1569	dev->type = ARPHRD_AX25;
1570	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1571	dev->mtu = AX25_DEF_PACLEN;
1572	dev->addr_len = AX25_ADDR_LEN;
1573
1574}
1575
1576/* ----> open network device <---- */
1577
1578static int scc_net_open(struct net_device *dev)
1579{
1580	struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1581
1582 	if (!scc->init)
1583		return -EINVAL;
1584
1585	scc->tx_buff = NULL;
1586	skb_queue_head_init(&scc->tx_queue);
1587 
1588	init_channel(scc);
1589
1590	netif_start_queue(dev);
1591	return 0;
1592}
1593
1594/* ----> close network device <---- */
1595
1596static int scc_net_close(struct net_device *dev)
1597{
1598	struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1599	unsigned long flags;
1600
1601	netif_stop_queue(dev);
1602
1603	spin_lock_irqsave(&scc->lock, flags);	
1604	Outb(scc->ctrl,0);		/* Make sure pointer is written */
1605	wr(scc,R1,0);			/* disable interrupts */
1606	wr(scc,R3,0);
1607	spin_unlock_irqrestore(&scc->lock, flags);
1608
1609	del_timer_sync(&scc->tx_t);
1610	del_timer_sync(&scc->tx_wdog);
1611	
1612	scc_discard_buffers(scc);
1613
1614	return 0;
1615}
1616
1617/* ----> receive frame, called from scc_rxint() <---- */
1618
1619static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1620{
1621	if (skb->len == 0) {
1622		dev_kfree_skb_irq(skb);
1623		return;
1624	}
1625		
1626	scc->dev_stat.rx_packets++;
1627	scc->dev_stat.rx_bytes += skb->len;
1628
1629	skb->protocol = ax25_type_trans(skb, scc->dev);
1630	
1631	netif_rx(skb);
1632}
1633
1634/* ----> transmit frame <---- */
1635
1636static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1637{
1638	struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1639	unsigned long flags;
1640	char kisscmd;
1641
1642	if (skb->protocol == htons(ETH_P_IP))
1643		return ax25_ip_xmit(skb);
1644
1645	if (skb->len > scc->stat.bufsize || skb->len < 2) {
1646		scc->dev_stat.tx_dropped++;	/* bogus frame */
1647		dev_kfree_skb(skb);
1648		return NETDEV_TX_OK;
1649	}
1650	
1651	scc->dev_stat.tx_packets++;
1652	scc->dev_stat.tx_bytes += skb->len;
1653	scc->stat.txframes++;
1654	
1655	kisscmd = *skb->data & 0x1f;
1656	skb_pull(skb, 1);
1657
1658	if (kisscmd) {
1659		scc_set_param(scc, kisscmd, *skb->data);
1660		dev_kfree_skb(skb);
1661		return NETDEV_TX_OK;
1662	}
1663
1664	spin_lock_irqsave(&scc->lock, flags);
1665		
1666	if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1667		struct sk_buff *skb_del;
1668		skb_del = skb_dequeue(&scc->tx_queue);
1669		dev_kfree_skb(skb_del);
1670	}
1671	skb_queue_tail(&scc->tx_queue, skb);
1672	netif_trans_update(dev);
1673	
1674
1675	/*
1676	 * Start transmission if the trx state is idle or
1677	 * t_idle hasn't expired yet. Use dwait/persistence/slottime
1678	 * algorithm for normal halfduplex operation.
1679	 */
1680
1681	if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1682		scc->stat.tx_state = TXS_BUSY;
1683		if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1684			__scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1685		else
1686			__scc_start_tx_timer(scc, t_dwait, 0);
1687	}
1688	spin_unlock_irqrestore(&scc->lock, flags);
1689	return NETDEV_TX_OK;
1690}
1691
1692/* ----> ioctl functions <---- */
1693
1694/*
1695 * SIOCSCCCFG		- configure driver	arg: (struct scc_hw_config *) arg
1696 * SIOCSCCINI		- initialize driver	arg: ---
1697 * SIOCSCCCHANINI	- initialize channel	arg: (struct scc_modem *) arg
1698 * SIOCSCCSMEM		- set memory		arg: (struct scc_mem_config *) arg
1699 * SIOCSCCGKISS		- get level 1 parameter	arg: (struct scc_kiss_cmd *) arg
1700 * SIOCSCCSKISS		- set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1701 * SIOCSCCGSTAT		- get driver status	arg: (struct scc_stat *) arg
1702 * SIOCSCCCAL		- send calib. pattern	arg: (struct scc_calibrate *) arg
1703 */
1704
1705static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1706{
1707	struct scc_kiss_cmd kiss_cmd;
1708	struct scc_mem_config memcfg;
1709	struct scc_hw_config hwcfg;
1710	struct scc_calibrate cal;
1711	struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1712	int chan;
1713	unsigned char device_name[IFNAMSIZ];
1714	void __user *arg = ifr->ifr_data;
1715	
1716	
1717	if (!Driver_Initialized)
1718	{
1719		if (cmd == SIOCSCCCFG)
1720		{
1721			int found = 1;
1722
1723			if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1724			if (!arg) return -EFAULT;
1725
1726			if (Nchips >= SCC_MAXCHIPS) 
1727				return -EINVAL;
1728
1729			if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1730				return -EFAULT;
1731
1732			if (hwcfg.irq == 2) hwcfg.irq = 9;
1733
1734			if (hwcfg.irq < 0 || hwcfg.irq >= nr_irqs)
1735				return -EINVAL;
1736				
1737			if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1738			{
1739				if (request_irq(hwcfg.irq, scc_isr,
1740						0, "AX.25 SCC",
1741						(void *)(long) hwcfg.irq))
1742					printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1743				else
1744					Ivec[hwcfg.irq].used = 1;
1745			}
1746
1747			if (hwcfg.vector_latch && !Vector_Latch) {
1748				if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1749					printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1750				else
1751					Vector_Latch = hwcfg.vector_latch;
1752			}
1753
1754			if (hwcfg.clock == 0)
1755				hwcfg.clock = SCC_DEFAULT_CLOCK;
1756
1757#ifndef SCC_DONT_CHECK
1758
1759			if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1760			{
1761				disable_irq(hwcfg.irq);
1762				Outb(hwcfg.ctrl_a, 0);
1763				OutReg(hwcfg.ctrl_a, R9, FHWRES);
1764				udelay(100);
1765				OutReg(hwcfg.ctrl_a,R13,0x55);		/* is this chip really there? */
1766				udelay(5);
1767
1768				if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1769					found = 0;
1770				enable_irq(hwcfg.irq);
1771				release_region(hwcfg.ctrl_a, 1);
1772			}
1773			else
1774				found = 0;
1775#endif
1776
1777			if (found)
1778			{
1779				SCC_Info[2*Nchips  ].ctrl = hwcfg.ctrl_a;
1780				SCC_Info[2*Nchips  ].data = hwcfg.data_a;
1781				SCC_Info[2*Nchips  ].irq  = hwcfg.irq;
1782				SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1783				SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1784				SCC_Info[2*Nchips+1].irq  = hwcfg.irq;
1785			
1786				SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1787				SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1788				SCC_ctrl[Nchips].irq    = hwcfg.irq;
1789			}
1790
1791
1792			for (chan = 0; chan < 2; chan++)
1793			{
1794				sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1795
1796				SCC_Info[2*Nchips+chan].special = hwcfg.special;
1797				SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1798				SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1799				SCC_Info[2*Nchips+chan].option = hwcfg.option;
1800				SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1801
1802#ifdef SCC_DONT_CHECK
1803				printk(KERN_INFO "%s: data port = 0x%3.3x  control port = 0x%3.3x\n",
1804					device_name, 
1805					SCC_Info[2*Nchips+chan].data, 
1806					SCC_Info[2*Nchips+chan].ctrl);
1807
1808#else
1809				printk(KERN_INFO "%s: data port = 0x%3.3lx  control port = 0x%3.3lx -- %s\n",
1810					device_name,
1811					chan? hwcfg.data_b : hwcfg.data_a, 
1812					chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1813					found? "found" : "missing");
1814#endif
1815
1816				if (found)
1817				{
1818					request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1819					request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1820					if (Nchips+chan != 0 &&
1821					    scc_net_alloc(device_name, 
1822							  &SCC_Info[2*Nchips+chan]))
1823					    return -EINVAL;
1824				}
1825			}
1826			
1827			if (found) Nchips++;
1828			
1829			return 0;
1830		}
1831		
1832		if (cmd == SIOCSCCINI)
1833		{
1834			if (!capable(CAP_SYS_RAWIO))
1835				return -EPERM;
1836				
1837			if (Nchips == 0)
1838				return -EINVAL;
1839
1840			z8530_init();
1841			return 0;
1842		}
1843		
1844		return -EINVAL;	/* confuse the user */
1845	}
1846	
1847	if (!scc->init)
1848	{
1849		if (cmd == SIOCSCCCHANINI)
1850		{
1851			if (!capable(CAP_NET_ADMIN)) return -EPERM;
1852			if (!arg) return -EINVAL;
1853			
1854			scc->stat.bufsize   = SCC_BUFSIZE;
1855
1856			if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1857				return -EINVAL;
1858			
1859			/* default KISS Params */
1860		
1861			if (scc->modem.speed < 4800)
1862			{
1863				scc->kiss.txdelay = 36;		/* 360 ms */
1864				scc->kiss.persist = 42;		/* 25% persistence */			/* was 25 */
1865				scc->kiss.slottime = 16;	/* 160 ms */
1866				scc->kiss.tailtime = 4;		/* minimal reasonable value */
1867				scc->kiss.fulldup = 0;		/* CSMA */
1868				scc->kiss.waittime = 50;	/* 500 ms */
1869				scc->kiss.maxkeyup = 10;	/* 10 s */
1870				scc->kiss.mintime = 3;		/* 3 s */
1871				scc->kiss.idletime = 30;	/* 30 s */
1872				scc->kiss.maxdefer = 120;	/* 2 min */
1873				scc->kiss.softdcd = 0;		/* hardware dcd */
1874			} else {
1875				scc->kiss.txdelay = 10;		/* 100 ms */
1876				scc->kiss.persist = 64;		/* 25% persistence */			/* was 25 */
1877				scc->kiss.slottime = 8;		/* 160 ms */
1878				scc->kiss.tailtime = 1;		/* minimal reasonable value */
1879				scc->kiss.fulldup = 0;		/* CSMA */
1880				scc->kiss.waittime = 50;	/* 500 ms */
1881				scc->kiss.maxkeyup = 7;		/* 7 s */
1882				scc->kiss.mintime = 3;		/* 3 s */
1883				scc->kiss.idletime = 30;	/* 30 s */
1884				scc->kiss.maxdefer = 120;	/* 2 min */
1885				scc->kiss.softdcd = 0;		/* hardware dcd */
1886			}
1887			
1888			scc->tx_buff = NULL;
1889			skb_queue_head_init(&scc->tx_queue);
1890			scc->init = 1;
1891			
1892			return 0;
1893		}
1894		
1895		return -EINVAL;
1896	}
1897	
1898	switch(cmd)
1899	{
1900		case SIOCSCCRESERVED:
1901			return -ENOIOCTLCMD;
1902
1903		case SIOCSCCSMEM:
1904			if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1905			if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1906				return -EINVAL;
1907			scc->stat.bufsize   = memcfg.bufsize;
1908			return 0;
1909		
1910		case SIOCSCCGSTAT:
1911			if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1912				return -EINVAL;
1913			return 0;
1914		
1915		case SIOCSCCGKISS:
1916			if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1917				return -EINVAL;
1918			kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1919			if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1920				return -EINVAL;
1921			return 0;
1922		
1923		case SIOCSCCSKISS:
1924			if (!capable(CAP_NET_ADMIN)) return -EPERM;
1925			if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1926				return -EINVAL;
1927			return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1928		
1929		case SIOCSCCCAL:
1930			if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1931			if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1932				return -EINVAL;
1933
1934			scc_start_calibrate(scc, cal.time, cal.pattern);
1935			return 0;
1936
1937		default:
1938			return -ENOIOCTLCMD;
1939		
1940	}
1941	
1942	return -EINVAL;
1943}
1944
1945/* ----> set interface callsign <---- */
1946
1947static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1948{
1949	struct sockaddr *sa = (struct sockaddr *) addr;
1950	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1951	return 0;
1952}
1953
1954/* ----> get statistics <---- */
1955
1956static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1957{
1958	struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1959	
1960	scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1961	scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1962	scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1963	scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1964
1965	return &scc->dev_stat;
1966}
1967
1968/* ******************************************************************** */
1969/* *		dump statistics to /proc/net/z8530drv		      * */
1970/* ******************************************************************** */
1971
1972#ifdef CONFIG_PROC_FS
1973
1974static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1975{
1976	int k;
1977
1978	for (k = 0; k < Nchips*2; ++k) {
1979		if (!SCC_Info[k].init) 
1980			continue;
1981		if (pos-- == 0)
1982			return &SCC_Info[k];
1983	}
1984	return NULL;
1985}
1986
1987static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1988{
1989	return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1990	
1991}
1992
1993static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1994{
1995	unsigned k;
1996	struct scc_channel *scc = v;
1997	++*pos;
1998	
1999	for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
2000	     k < Nchips*2; ++k) {
2001		if (SCC_Info[k].init) 
2002			return &SCC_Info[k];
2003	}
2004	return NULL;
2005}
2006
2007static void scc_net_seq_stop(struct seq_file *seq, void *v)
2008{
2009}
2010
2011static int scc_net_seq_show(struct seq_file *seq, void *v)
2012{
2013	if (v == SEQ_START_TOKEN) {
2014		seq_puts(seq, "z8530drv-"VERSION"\n");
2015	} else if (!Driver_Initialized) {
2016		seq_puts(seq, "not initialized\n");
2017	} else if (!Nchips) {
2018		seq_puts(seq, "chips missing\n");
2019	} else {
2020		const struct scc_channel *scc = v;
2021		const struct scc_stat *stat = &scc->stat;
2022		const struct scc_kiss *kiss = &scc->kiss;
2023
2024
2025		/* dev	data ctrl irq clock brand enh vector special option 
2026		 *	baud nrz clocksrc softdcd bufsize
2027		 *	rxints txints exints spints
2028		 *	rcvd rxerrs over / xmit txerrs under / nospace bufsize
2029		 *	txd pers slot tail ful wait min maxk idl defr txof grp
2030		 *	W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2031		 *	R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2032		 */
2033
2034		seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2035				scc->dev->name,
2036				scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2037				scc->enhanced, Vector_Latch, scc->special,
2038				scc->option);
2039		seq_printf(seq, "\t%lu %d %d %d %d\n",
2040				scc->modem.speed, scc->modem.nrz,
2041				scc->modem.clocksrc, kiss->softdcd,
2042				stat->bufsize);
2043		seq_printf(seq, "\t%lu %lu %lu %lu\n",
2044				stat->rxints, stat->txints, stat->exints, stat->spints);
2045		seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2046				stat->rxframes, stat->rxerrs, stat->rx_over,
2047				stat->txframes, stat->txerrs, stat->tx_under,
2048				stat->nospace,  stat->tx_state);
2049
2050#define K(x) kiss->x
2051		seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2052				K(txdelay), K(persist), K(slottime), K(tailtime),
2053				K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2054				K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2055#undef K
2056#ifdef SCC_DEBUG
2057		{
2058			int reg;
2059
2060		seq_printf(seq, "\tW ");
2061			for (reg = 0; reg < 16; reg++)
2062				seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2063			seq_printf(seq, "\n");
2064			
2065		seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2066			for (reg = 3; reg < 8; reg++)
2067				seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2068			seq_printf(seq, "XX ");
2069			for (reg = 9; reg < 16; reg++)
2070				seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2071			seq_printf(seq, "\n");
2072		}
2073#endif
2074		seq_putc(seq, '\n');
2075	}
2076
2077        return 0;
2078}
2079
2080static const struct seq_operations scc_net_seq_ops = {
2081	.start  = scc_net_seq_start,
2082	.next   = scc_net_seq_next,
2083	.stop   = scc_net_seq_stop,
2084	.show   = scc_net_seq_show,
2085};
2086
2087
2088static int scc_net_seq_open(struct inode *inode, struct file *file)
2089{
2090	return seq_open(file, &scc_net_seq_ops);
2091}
2092
2093static const struct file_operations scc_net_seq_fops = {
2094	.owner	 = THIS_MODULE,
2095	.open	 = scc_net_seq_open,
2096	.read	 = seq_read,
2097	.llseek	 = seq_lseek,
2098	.release = seq_release_private,
2099};
2100
2101#endif /* CONFIG_PROC_FS */
2102
2103 
2104/* ******************************************************************** */
2105/* * 			Init SCC driver 			      * */
2106/* ******************************************************************** */
2107
2108static int __init scc_init_driver (void)
2109{
2110	char devname[IFNAMSIZ];
2111	
2112	printk(banner);
2113	
2114	sprintf(devname,"%s0", SCC_DriverName);
2115	
2116	rtnl_lock();
2117	if (scc_net_alloc(devname, SCC_Info)) {
2118		rtnl_unlock();
2119		printk(KERN_ERR "z8530drv: cannot initialize module\n");
2120		return -EIO;
2121	}
2122	rtnl_unlock();
2123
2124	proc_create("z8530drv", 0, init_net.proc_net, &scc_net_seq_fops);
2125
2126	return 0;
2127}
2128
2129static void __exit scc_cleanup_driver(void)
2130{
2131	io_port ctrl;
2132	int k;
2133	struct scc_channel *scc;
2134	struct net_device *dev;
2135	
2136	if (Nchips == 0 && (dev = SCC_Info[0].dev)) 
2137	{
2138		unregister_netdev(dev);
2139		free_netdev(dev);
2140	}
2141
2142	/* Guard against chip prattle */
2143	local_irq_disable();
2144	
2145	for (k = 0; k < Nchips; k++)
2146		if ( (ctrl = SCC_ctrl[k].chan_A) )
2147		{
2148			Outb(ctrl, 0);
2149			OutReg(ctrl,R9,FHWRES);	/* force hardware reset */
2150			udelay(50);
2151		}
2152		
2153	/* To unload the port must be closed so no real IRQ pending */
2154	for (k = 0; k < nr_irqs ; k++)
2155		if (Ivec[k].used) free_irq(k, NULL);
2156		
2157	local_irq_enable();
2158		
2159	/* Now clean up */
2160	for (k = 0; k < Nchips*2; k++)
2161	{
2162		scc = &SCC_Info[k];
2163		if (scc->ctrl)
2164		{
2165			release_region(scc->ctrl, 1);
2166			release_region(scc->data, 1);
2167		}
2168		if (scc->dev)
2169		{
2170			unregister_netdev(scc->dev);
2171			free_netdev(scc->dev);
2172		}
2173	}
2174	
2175		
2176	if (Vector_Latch)
2177		release_region(Vector_Latch, 1);
2178
2179	remove_proc_entry("z8530drv", init_net.proc_net);
2180}
2181
2182MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2183MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2184MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2185MODULE_LICENSE("GPL");
2186module_init(scc_init_driver);
2187module_exit(scc_cleanup_driver);