1135332Sglebius#define RCS_ID "$Id: scc.c,v 1.75 1998/11/04 15:15:01 jreuter Exp jreuter $" 2219182Sglebius 3143923Sglebius#define VERSION "3.0" 4135332Sglebius 5135332Sglebius/* 6135332Sglebius * Please use z8530drv-utils-3.0 with this version. 7135332Sglebius * ------------------ 8135332Sglebius * 9135332Sglebius * You can find a subset of the documentation in 10135332Sglebius * Documentation/networking/device_drivers/hamradio/z8530drv.rst. 11135332Sglebius */ 12135332Sglebius 13135332Sglebius/* 14135332Sglebius ******************************************************************** 15135332Sglebius * SCC.C - Linux driver for Z8530 based HDLC cards for AX.25 * 16135332Sglebius ******************************************************************** 17135332Sglebius 18135332Sglebius 19135332Sglebius ******************************************************************** 20135332Sglebius 21135332Sglebius Copyright (c) 1993, 2000 Joerg Reuter DL1BKE 22135332Sglebius 23135332Sglebius portions (c) 1993 Guido ten Dolle PE1NNZ 24135332Sglebius 25135332Sglebius ******************************************************************** 26135332Sglebius 27135332Sglebius The driver and the programs in the archive are UNDER CONSTRUCTION. 28135332Sglebius The code is likely to fail, and so your kernel could --- even 29135332Sglebius a whole network. 30135332Sglebius 31260278Sdim This driver is intended for Amateur Radio use. If you are running it 32260278Sdim for commercial purposes, please drop me a note. I am nosy... 33135332Sglebius 34219182Sglebius ...BUT: 35219182Sglebius 36219182Sglebius ! You m u s t recognize the appropriate legislations of your country ! 37135332Sglebius ! before you connect a radio to the SCC board and start to transmit or ! 38135332Sglebius ! receive. The GPL allows you to use the d r i v e r, NOT the RADIO! ! 39135332Sglebius 40167990Sglebius For non-Amateur-Radio use please note that you might need a special 41135332Sglebius allowance/licence from the designer of the SCC Board and/or the 42135332Sglebius MODEM. 43140511Sglebius 44135332Sglebius This program is free software; you can redistribute it and/or modify 45135332Sglebius it under the terms of the (modified) GNU General Public License 46135332Sglebius delivered with the Linux kernel source. 47135332Sglebius 48219182Sglebius This program is distributed in the hope that it will be useful, 49135332Sglebius but WITHOUT ANY WARRANTY; without even the implied warranty of 50135332Sglebius MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 51163247Sglebius GNU General Public License for more details. 52135332Sglebius 53135332Sglebius You should find a copy of the GNU General Public License in 54135332Sglebius /usr/src/linux/COPYING; 55135332Sglebius 56219182Sglebius ******************************************************************** 57143923Sglebius 58143923Sglebius 59219182Sglebius Incomplete history of z8530drv: 60135332Sglebius ------------------------------- 61135332Sglebius 62135332Sglebius 1994-09-13 started to write the driver, rescued most of my own 63135332Sglebius code (and Hans Alblas' memory buffer pool concept) from 64135332Sglebius an earlier project "sccdrv" which was initiated by 65219182Sglebius Guido ten Dolle. Not much of the old driver survived, 66135332Sglebius though. The first version I put my hands on was sccdrv1.3 67135332Sglebius from August 1993. The memory buffer pool concept 68135332Sglebius appeared in an unauthorized sccdrv version (1.5) from 69135332Sglebius August 1994. 70135332Sglebius 71135332Sglebius 1995-01-31 changed copyright notice to GPL without limitations. 72135332Sglebius 73135332Sglebius . 74135332Sglebius . <SNIP> 75135332Sglebius . 76135332Sglebius 77135332Sglebius 1996-10-05 New semester, new driver... 78135332Sglebius 79135332Sglebius * KISS TNC emulator removed (TTY driver) 80135332Sglebius * Source moved to drivers/net/ 81135332Sglebius * Includes Z8530 defines from drivers/net/z8530.h 82135332Sglebius * Uses sk_buffer memory management 83135332Sglebius * Reduced overhead of /proc/net/z8530drv output 84135332Sglebius * Streamlined quite a lot things 85135332Sglebius * Invents brand new bugs... ;-) 86135332Sglebius 87135332Sglebius The move to version number 3.0 reflects theses changes. 88135332Sglebius You can use 'kissbridge' if you need a KISS TNC emulator. 89135332Sglebius 90135332Sglebius 1996-12-13 Fixed for Linux networking changes. (G4KLX) 91135332Sglebius 1997-01-08 Fixed the remaining problems. 92135332Sglebius 1997-04-02 Hopefully fixed the problems with the new *_timer() 93135332Sglebius routines, added calibration code. 94135332Sglebius 1997-10-12 Made SCC_DELAY a CONFIG option, added CONFIG_SCC_TRXECHO 95135332Sglebius 1998-01-29 Small fix to avoid lock-up on initialization 96135332Sglebius 1998-09-29 Fixed the "grouping" bugs, tx_inhibit works again, 97135332Sglebius using dev->tx_queue_len now instead of MAXQUEUE now. 98135332Sglebius 1998-10-21 Postponed the spinlock changes, would need a lot of 99135332Sglebius testing I currently don't have the time to. Softdcd doesn't 100135332Sglebius work. 101135332Sglebius 1998-11-04 Softdcd does not work correctly in DPLL mode, in fact it 102135332Sglebius never did. The DPLL locks on noise, the SYNC unit sees 103135332Sglebius flags that aren't... Restarting the DPLL does not help 104135332Sglebius either, it resynchronizes too slow and the first received 105135332Sglebius frame gets lost. 106135332Sglebius 2000-02-13 Fixed for new network driver interface changes, still 107135332Sglebius does TX timeouts itself since it uses its own queue 108135332Sglebius scheme. 109135332Sglebius 110135332Sglebius Thanks to all who contributed to this driver with ideas and bug 111135332Sglebius reports! 112135332Sglebius 113135332Sglebius NB -- if you find errors, change something, please let me know 114135332Sglebius first before you distribute it... And please don't touch 115135332Sglebius the version number. Just replace my callsign in 116135332Sglebius "v3.0.dl1bke" with your own. Just to avoid confusion... 117183693Smav 118183693Smav If you want to add your modification to the linux distribution 119183693Smav please (!) contact me first. 120183693Smav 121183693Smav New versions of the driver will be announced on the linux-hams 122183693Smav mailing list on vger.kernel.org. To subscribe send an e-mail 123183693Smav to majordomo@vger.kernel.org with the following line in 124183693Smav the body of the mail: 125219182Sglebius 126219182Sglebius subscribe linux-hams 127219182Sglebius 128219182Sglebius The content of the "Subject" field will be ignored. 129219182Sglebius 130219182Sglebius vy 73, 131219182Sglebius Joerg Reuter ampr-net: dl1bke@db0pra.ampr.org 132219182Sglebius AX-25 : DL1BKE @ DB0ABH.#BAY.DEU.EU 133219182Sglebius Internet: jreuter@yaina.de 134219182Sglebius www : http://yaina.de/jreuter 135219182Sglebius*/ 136219182Sglebius 137219182Sglebius/* ----------------------------------------------------------------------- */ 138219182Sglebius 139219182Sglebius#undef SCC_LDELAY /* slow it even a bit more down */ 140219182Sglebius#undef SCC_DONT_CHECK /* don't look if the SCCs you specified are available */ 141241446Smelifaro 142241446Smelifaro#define SCC_MAXCHIPS 4 /* number of max. supported chips */ 143241446Smelifaro#define SCC_BUFSIZE 384 /* must not exceed 4096 */ 144241446Smelifaro#undef SCC_DEBUG 145241446Smelifaro 146241446Smelifaro#define SCC_DEFAULT_CLOCK 4915200 147241446Smelifaro /* default pclock if nothing is specified */ 148241446Smelifaro 149135332Sglebius/* ----------------------------------------------------------------------- */ 150135332Sglebius 151135332Sglebius#include <linux/compat.h> 152135332Sglebius#include <linux/module.h> 153135332Sglebius#include <linux/errno.h> 154135332Sglebius#include <linux/signal.h> 155135332Sglebius#include <linux/timer.h> 156135332Sglebius#include <linux/interrupt.h> 157135332Sglebius#include <linux/ioport.h> 158135332Sglebius#include <linux/string.h> 159135332Sglebius#include <linux/in.h> 160135332Sglebius#include <linux/fcntl.h> 161135332Sglebius#include <linux/ptrace.h> 162138392Sglebius#include <linux/delay.h> 163135332Sglebius#include <linux/skbuff.h> 164135332Sglebius#include <linux/netdevice.h> 165135332Sglebius#include <linux/rtnetlink.h> 166135332Sglebius#include <linux/if_ether.h> 167135332Sglebius#include <linux/if_arp.h> 168135332Sglebius#include <linux/socket.h> 169135332Sglebius#include <linux/init.h> 170135332Sglebius#include <linux/scc.h> 171135332Sglebius#include <linux/ctype.h> 172135332Sglebius#include <linux/kernel.h> 173135332Sglebius#include <linux/proc_fs.h> 174135332Sglebius#include <linux/seq_file.h> 175135332Sglebius#include <linux/bitops.h> 176135332Sglebius 177135332Sglebius#include <net/net_namespace.h> 178135332Sglebius#include <net/ax25.h> 179135332Sglebius 180135332Sglebius#include <asm/irq.h> 181135332Sglebius#include <asm/io.h> 182135332Sglebius#include <linux/uaccess.h> 183135332Sglebius 184135332Sglebius#include "z8530.h" 185135332Sglebius 186183693Smavstatic const char banner[] __initconst = KERN_INFO \ 187183693Smav "AX.25: Z8530 SCC driver version "VERSION".dl1bke\n"; 188183693Smav 189183693Smavstatic void t_dwait(struct timer_list *t); 190183693Smavstatic void t_txdelay(struct timer_list *t); 191183693Smavstatic void t_tail(struct timer_list *t); 192183693Smavstatic void t_busy(struct timer_list *); 193219182Sglebiusstatic void t_maxkeyup(struct timer_list *); 194219182Sglebiusstatic void t_idle(struct timer_list *t); 195219182Sglebiusstatic void scc_tx_done(struct scc_channel *); 196219182Sglebiusstatic void scc_start_tx_timer(struct scc_channel *, 197219182Sglebius void (*)(struct timer_list *), unsigned long); 198219182Sglebiusstatic void scc_start_maxkeyup(struct scc_channel *); 199219182Sglebiusstatic void scc_start_defer(struct scc_channel *); 200219182Sglebius 201219182Sglebiusstatic void z8530_init(void); 202219182Sglebius 203219182Sglebiusstatic void init_channel(struct scc_channel *scc); 204219182Sglebiusstatic void scc_key_trx (struct scc_channel *scc, char tx); 205219182Sglebiusstatic void scc_init_timer(struct scc_channel *scc); 206219182Sglebius 207241446Smelifarostatic int scc_net_alloc(const char *name, struct scc_channel *scc); 208241446Smelifarostatic void scc_net_setup(struct net_device *dev); 209241446Smelifarostatic int scc_net_open(struct net_device *dev); 210241446Smelifarostatic int scc_net_close(struct net_device *dev); 211241446Smelifarostatic void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb); 212241446Smelifarostatic netdev_tx_t scc_net_tx(struct sk_buff *skb, 213241446Smelifaro struct net_device *dev); 214135332Sglebiusstatic int scc_net_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 215135332Sglebius void __user *data, int cmd); 216135332Sglebiusstatic int scc_net_set_mac_address(struct net_device *dev, void *addr); 217135332Sglebiusstatic struct net_device_stats * scc_net_get_stats(struct net_device *dev); 218135332Sglebius 219135332Sglebiusstatic unsigned char SCC_DriverName[] = "scc"; 220135332Sglebius 221135332Sglebiusstatic struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS]; 222135332Sglebius 223135332Sglebiusstatic struct scc_channel SCC_Info[2 * SCC_MAXCHIPS]; /* information per channel */ 224135332Sglebius 225135332Sglebiusstatic struct scc_ctrl { 226135332Sglebius io_port chan_A; 227135332Sglebius io_port chan_B; 228135332Sglebius int irq; 229135332Sglebius} SCC_ctrl[SCC_MAXCHIPS+1]; 230135332Sglebius 231135332Sglebiusstatic unsigned char Driver_Initialized; 232135332Sglebiusstatic int Nchips; 233135332Sglebiusstatic io_port Vector_Latch; 234135332Sglebius 235146092Sglebius 236135332Sglebius/* ******************************************************************** */ 237135332Sglebius/* * Port Access Functions * */ 238220769Sglebius/* ******************************************************************** */ 239135332Sglebius 240135332Sglebius/* These provide interrupt save 2-step access to the Z8530 registers */ 241220768Sglebius 242135332Sglebiusstatic DEFINE_SPINLOCK(iolock); /* Guards paired accesses */ 243232921Smelifaro 244232921Smelifarostatic inline unsigned char InReg(io_port port, unsigned char reg) 245232921Smelifaro{ 246232921Smelifaro unsigned long flags; 247232921Smelifaro unsigned char r; 248135332Sglebius 249135332Sglebius spin_lock_irqsave(&iolock, flags); 250135332Sglebius#ifdef SCC_LDELAY 251135332Sglebius Outb(port, reg); 252135332Sglebius udelay(SCC_LDELAY); 253135332Sglebius r=Inb(port); 254135332Sglebius udelay(SCC_LDELAY); 255135332Sglebius#else 256183693Smav Outb(port, reg); 257183693Smav r=Inb(port); 258183693Smav#endif 259183693Smav spin_unlock_irqrestore(&iolock, flags); 260135332Sglebius return r; 261178250Skris} 262135332Sglebius 263135332Sglebiusstatic inline void OutReg(io_port port, unsigned char reg, unsigned char val) 264220769Sglebius{ 265135332Sglebius unsigned long flags; 266135332Sglebius 267135332Sglebius spin_lock_irqsave(&iolock, flags); 268135332Sglebius#ifdef SCC_LDELAY 269135332Sglebius Outb(port, reg); udelay(SCC_LDELAY); 270135332Sglebius Outb(port, val); udelay(SCC_LDELAY); 271135332Sglebius#else 272135332Sglebius Outb(port, reg); 273135332Sglebius Outb(port, val); 274135332Sglebius#endif 275135332Sglebius spin_unlock_irqrestore(&iolock, flags); 276135332Sglebius} 277135332Sglebius 278135332Sglebiusstatic inline void wr(struct scc_channel *scc, unsigned char reg, 279135332Sglebius unsigned char val) 280135332Sglebius{ 281135332Sglebius OutReg(scc->ctrl, reg, (scc->wreg[reg] = val)); 282135332Sglebius} 283135332Sglebius 284135332Sglebiusstatic inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val) 285135332Sglebius{ 286135332Sglebius OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val)); 287135332Sglebius} 288135332Sglebius 289135332Sglebiusstatic inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val) 290135332Sglebius{ 291135332Sglebius OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val)); 292135332Sglebius} 293135332Sglebius 294135332Sglebius/* ******************************************************************** */ 295135332Sglebius/* * Some useful macros * */ 296135332Sglebius/* ******************************************************************** */ 297135332Sglebius 298135332Sglebiusstatic inline void scc_discard_buffers(struct scc_channel *scc) 299135332Sglebius{ 300135332Sglebius unsigned long flags; 301135332Sglebius 302135332Sglebius spin_lock_irqsave(&scc->lock, flags); 303135332Sglebius if (scc->tx_buff != NULL) 304135332Sglebius { 305135332Sglebius dev_kfree_skb_irq(scc->tx_buff); 306135332Sglebius scc->tx_buff = NULL; 307135332Sglebius } 308135332Sglebius 309135332Sglebius while (!skb_queue_empty(&scc->tx_queue)) 310135332Sglebius dev_kfree_skb_irq(skb_dequeue(&scc->tx_queue)); 311143988Sglebius 312143988Sglebius spin_unlock_irqrestore(&scc->lock, flags); 313143988Sglebius} 314143988Sglebius 315143988Sglebius 316143988Sglebius 317143988Sglebius/* ******************************************************************** */ 318143988Sglebius/* * Interrupt Service Routines * */ 319143988Sglebius/* ******************************************************************** */ 320143988Sglebius 321143988Sglebius 322143988Sglebius/* ----> subroutines for the interrupt handlers <---- */ 323143988Sglebius 324143988Sglebiusstatic inline void scc_notify(struct scc_channel *scc, int event) 325143988Sglebius{ 326143988Sglebius struct sk_buff *skb; 327143988Sglebius char *bp; 328143988Sglebius 329143988Sglebius if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA) 330143988Sglebius return; 331143988Sglebius 332143988Sglebius skb = dev_alloc_skb(2); 333143988Sglebius if (skb != NULL) 334143988Sglebius { 335143988Sglebius bp = skb_put(skb, 2); 336135332Sglebius *bp++ = PARAM_HWEVENT; 337135332Sglebius *bp++ = event; 338135332Sglebius scc_net_rx(scc, skb); 339135332Sglebius } else 340135332Sglebius scc->stat.nospace++; 341219182Sglebius} 342219182Sglebius 343219182Sglebiusstatic inline void flush_rx_FIFO(struct scc_channel *scc) 344219182Sglebius{ 345135332Sglebius int k; 346135332Sglebius 347175934Smav for (k=0; k<3; k++) 348175934Smav Inb(scc->data); 349175934Smav 350219182Sglebius if(scc->rx_buff != NULL) /* did we receive something? */ 351219182Sglebius { 352219182Sglebius scc->stat.rxerrs++; /* then count it as an error */ 353219182Sglebius dev_kfree_skb_irq(scc->rx_buff); 354219182Sglebius scc->rx_buff = NULL; 355219182Sglebius } 356219182Sglebius} 357219182Sglebius 358219182Sglebiusstatic void start_hunt(struct scc_channel *scc) 359219182Sglebius{ 360135332Sglebius if ((scc->modem.clocksrc != CLK_EXTERNAL)) 361135332Sglebius OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */ 362135332Sglebius or(scc,R3,ENT_HM|RxENABLE); /* enable the receiver, hunt mode */ 363135332Sglebius} 364135332Sglebius 365135332Sglebius/* ----> four different interrupt handlers for Tx, Rx, changing of */ 366135332Sglebius/* DCD/CTS and Rx/Tx errors */ 367135332Sglebius 368135332Sglebius/* Transmitter interrupt handler */ 369135332Sglebiusstatic inline void scc_txint(struct scc_channel *scc) 370135332Sglebius{ 371135332Sglebius struct sk_buff *skb; 372135332Sglebius 373135332Sglebius scc->stat.txints++; 374135332Sglebius skb = scc->tx_buff; 375135332Sglebius 376135332Sglebius /* send first octet */ 377135332Sglebius 378135332Sglebius if (skb == NULL) 379135332Sglebius { 380135332Sglebius skb = skb_dequeue(&scc->tx_queue); 381135332Sglebius scc->tx_buff = skb; 382248724Sglebius netif_wake_queue(scc->dev); 383135332Sglebius 384135332Sglebius if (skb == NULL) 385135332Sglebius { 386135332Sglebius scc_tx_done(scc); 387135332Sglebius Outb(scc->ctrl, RES_Tx_P); 388135332Sglebius return; 389135332Sglebius } 390135332Sglebius 391248724Sglebius if (skb->len == 0) /* Paranoia... */ 392135332Sglebius { 393248724Sglebius dev_kfree_skb_irq(skb); 394135332Sglebius scc->tx_buff = NULL; 395138392Sglebius scc_tx_done(scc); 396135332Sglebius Outb(scc->ctrl, RES_Tx_P); 397138392Sglebius return; 398135332Sglebius } 399135332Sglebius 400138392Sglebius scc->stat.tx_state = TXS_ACTIVE; 401154354Sglebius 402138392Sglebius OutReg(scc->ctrl, R0, RES_Tx_CRC); 403135332Sglebius /* reset CRC generator */ 404135332Sglebius or(scc,R10,ABUNDER); /* re-install underrun protection */ 405135332Sglebius Outb(scc->data,*skb->data); /* send byte */ 406135332Sglebius skb_pull(skb, 1); 407135332Sglebius 408135332Sglebius if (!scc->enhanced) /* reset EOM latch */ 409135332Sglebius Outb(scc->ctrl,RES_EOM_L); 410135332Sglebius return; 411135332Sglebius } 412135332Sglebius 413135332Sglebius /* End Of Frame... */ 414135332Sglebius 415248724Sglebius if (skb->len == 0) 416135332Sglebius { 417248724Sglebius Outb(scc->ctrl, RES_Tx_P); /* reset pending int */ 418135332Sglebius cl(scc, R10, ABUNDER); /* send CRC */ 419135332Sglebius dev_kfree_skb_irq(skb); 420135332Sglebius scc->tx_buff = NULL; 421248724Sglebius scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */ 422248724Sglebius return; 423135332Sglebius } 424135332Sglebius 425135332Sglebius /* send octet */ 426154354Sglebius 427138392Sglebius Outb(scc->data,*skb->data); 428135332Sglebius skb_pull(skb, 1); 429135332Sglebius} 430135332Sglebius 431135332Sglebius 432135332Sglebius/* External/Status interrupt handler */ 433135332Sglebiusstatic inline void scc_exint(struct scc_channel *scc) 434135332Sglebius{ 435135332Sglebius unsigned char status,changes,chg_and_stat; 436135332Sglebius 437135332Sglebius scc->stat.exints++; 438135332Sglebius 439135332Sglebius status = InReg(scc->ctrl,R0); 440135332Sglebius changes = status ^ scc->status; 441135332Sglebius chg_and_stat = changes & status; 442135332Sglebius 443135332Sglebius /* ABORT: generated whenever DCD drops while receiving */ 444135332Sglebius 445248724Sglebius if (chg_and_stat & BRK_ABRT) /* Received an ABORT */ 446135332Sglebius flush_rx_FIFO(scc); 447248724Sglebius 448135332Sglebius /* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */ 449135332Sglebius 450135332Sglebius if ((changes & SYNC_HUNT) && scc->kiss.softdcd) 451248724Sglebius { 452248724Sglebius if (status & SYNC_HUNT) 453135332Sglebius { 454135332Sglebius scc->dcd = 0; 455135332Sglebius flush_rx_FIFO(scc); 456154354Sglebius if ((scc->modem.clocksrc != CLK_EXTERNAL)) 457138392Sglebius OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */ 458135332Sglebius } else { 459135332Sglebius scc->dcd = 1; 460135332Sglebius } 461135332Sglebius 462135332Sglebius scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON); 463135332Sglebius } 464135332Sglebius 465135332Sglebius /* DCD: on = start to receive packet, off = ABORT condition */ 466135332Sglebius /* (a successfully received packet generates a special condition int) */ 467248724Sglebius 468135332Sglebius if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */ 469248724Sglebius { 470135332Sglebius if(status & DCD) /* DCD is now ON */ 471135332Sglebius { 472248724Sglebius start_hunt(scc); 473248724Sglebius scc->dcd = 1; 474135332Sglebius } else { /* DCD is now OFF */ 475135332Sglebius cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */ 476135332Sglebius flush_rx_FIFO(scc); 477135332Sglebius scc->dcd = 0; 478135332Sglebius } 479135332Sglebius 480135332Sglebius scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF); 481135332Sglebius } 482248724Sglebius 483183693Smav#ifdef notdef 484248724Sglebius /* CTS: use external TxDelay (what's that good for?!) 485183693Smav * Anyway: If we _could_ use it (BayCom USCC uses CTS for 486183693Smav * own purposes) we _should_ use the "autoenable" feature 487248724Sglebius * of the Z8530 and not this interrupt... 488248724Sglebius */ 489183693Smav 490183693Smav if (chg_and_stat & CTS) /* CTS is now ON */ 491183693Smav { 492183693Smav if (scc->kiss.txdelay == 0) /* zero TXDELAY = wait for CTS */ 493183693Smav scc_start_tx_timer(scc, t_txdelay, 0); 494183693Smav } 495183693Smav#endif 496183693Smav 497183693Smav if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM)) 498183693Smav { 499248724Sglebius scc->stat.tx_under++; /* oops, an underrun! count 'em */ 500219182Sglebius Outb(scc->ctrl, RES_EXT_INT); /* reset ext/status interrupts */ 501248724Sglebius 502219182Sglebius if (scc->tx_buff != NULL) 503219182Sglebius { 504248724Sglebius dev_kfree_skb_irq(scc->tx_buff); 505248724Sglebius scc->tx_buff = NULL; 506219182Sglebius } 507219182Sglebius 508219182Sglebius or(scc,R10,ABUNDER); 509219182Sglebius scc_start_tx_timer(scc, t_txdelay, 0); /* restart transmission */ 510219182Sglebius } 511219182Sglebius 512219182Sglebius scc->status = status; 513219182Sglebius Outb(scc->ctrl,RES_EXT_INT); 514248724Sglebius} 515219182Sglebius 516248724Sglebius 517219182Sglebius/* Receiver interrupt handler */ 518219182Sglebiusstatic inline void scc_rxint(struct scc_channel *scc) 519248724Sglebius{ 520248724Sglebius struct sk_buff *skb; 521219182Sglebius 522219182Sglebius scc->stat.rxints++; 523219182Sglebius 524219182Sglebius if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF) 525219182Sglebius { 526219182Sglebius Inb(scc->data); /* discard char */ 527219182Sglebius or(scc,R3,ENT_HM); /* enter hunt mode for next flag */ 528219182Sglebius return; 529219182Sglebius } 530248724Sglebius 531135332Sglebius skb = scc->rx_buff; 532248724Sglebius 533248724Sglebius if (skb == NULL) 534135332Sglebius { 535135332Sglebius skb = dev_alloc_skb(scc->stat.bufsize); 536135332Sglebius if (skb == NULL) 537135332Sglebius { 538135332Sglebius scc->dev_stat.rx_dropped++; 539135332Sglebius scc->stat.nospace++; 540135332Sglebius Inb(scc->data); 541223787Sglebius or(scc, R3, ENT_HM); 542223787Sglebius return; 543223787Sglebius } 544135332Sglebius 545223787Sglebius scc->rx_buff = skb; 546223787Sglebius skb_put_u8(skb, 0); /* KISS data */ 547223787Sglebius } 548135332Sglebius 549241446Smelifaro if (skb->len >= scc->stat.bufsize) 550248724Sglebius { 551241446Smelifaro#ifdef notdef 552241446Smelifaro printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n"); 553248724Sglebius#endif 554248724Sglebius dev_kfree_skb_irq(skb); 555241446Smelifaro scc->rx_buff = NULL; 556241446Smelifaro Inb(scc->data); 557241446Smelifaro or(scc, R3, ENT_HM); 558241446Smelifaro return; 559248724Sglebius } 560135332Sglebius 561135332Sglebius skb_put_u8(skb, Inb(scc->data)); 562135332Sglebius} 563135332Sglebius 564135332Sglebius 565135332Sglebius/* Receive Special Condition interrupt handler */ 566135332Sglebiusstatic inline void scc_spint(struct scc_channel *scc) 567135332Sglebius{ 568135332Sglebius unsigned char status; 569135332Sglebius struct sk_buff *skb; 570135332Sglebius 571135332Sglebius scc->stat.spints++; 572135332Sglebius 573135332Sglebius status = InReg(scc->ctrl,R1); /* read receiver status */ 574135332Sglebius 575135332Sglebius Inb(scc->data); /* throw away Rx byte */ 576135332Sglebius skb = scc->rx_buff; 577135332Sglebius 578135332Sglebius if(status & Rx_OVR) /* receiver overrun */ 579135332Sglebius { 580135332Sglebius scc->stat.rx_over++; /* count them */ 581135332Sglebius or(scc,R3,ENT_HM); /* enter hunt mode for next flag */ 582135332Sglebius 583135332Sglebius if (skb != NULL) 584135332Sglebius dev_kfree_skb_irq(skb); 585135332Sglebius scc->rx_buff = skb = NULL; 586135332Sglebius } 587135332Sglebius 588183693Smav if(status & END_FR && skb != NULL) /* end of frame */ 589219182Sglebius { 590219182Sglebius /* CRC okay, frame ends on 8 bit boundary and received something ? */ 591219182Sglebius 592183693Smav if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0) 593219182Sglebius { 594237227Smelifaro /* ignore last received byte (first of the CRC bytes) */ 595237226Smelifaro skb_trim(skb, skb->len-1); 596183693Smav scc_net_rx(scc, skb); 597219182Sglebius scc->rx_buff = NULL; 598219182Sglebius scc->stat.rxframes++; 599219182Sglebius } else { /* a bad frame */ 600135332Sglebius dev_kfree_skb_irq(skb); 601219182Sglebius scc->rx_buff = NULL; 602135332Sglebius scc->stat.rxerrs++; 603135332Sglebius } 604135332Sglebius } 605135332Sglebius 606140511Sglebius Outb(scc->ctrl,ERR_RES); 607135332Sglebius} 608135332Sglebius 609135332Sglebius 610183693Smav/* ----> interrupt service routine for the Z8530 <---- */ 611183693Smav 612183693Smavstatic void scc_isr_dispatch(struct scc_channel *scc, int vector) 613183693Smav{ 614183693Smav spin_lock(&scc->lock); 615183693Smav switch (vector & VECTOR_MASK) 616183693Smav { 617183693Smav case TXINT: scc_txint(scc); break; 618219182Sglebius case EXINT: scc_exint(scc); break; 619183693Smav case RXINT: scc_rxint(scc); break; 620219182Sglebius case SPINT: scc_spint(scc); break; 621248724Sglebius } 622248724Sglebius spin_unlock(&scc->lock); 623183693Smav} 624183693Smav 625183693Smav/* If the card has a latch for the interrupt vector (like the PA0HZP card) 626183693Smav use it to get the number of the chip that generated the int. 627183693Smav If not: poll all defined chips. 628183693Smav */ 629183693Smav 630183693Smav#define SCC_IRQTIMEOUT 30000 631183693Smav 632183693Smavstatic irqreturn_t scc_isr(int irq, void *dev_id) 633183693Smav{ 634183693Smav int chip_irq = (long) dev_id; 635183693Smav unsigned char vector; 636183693Smav struct scc_channel *scc; 637183693Smav struct scc_ctrl *ctrl; 638143988Sglebius int k; 639143988Sglebius 640183693Smav if (Vector_Latch) 641143988Sglebius { 642143988Sglebius for(k=0; k < SCC_IRQTIMEOUT; k++) 643183693Smav { 644248724Sglebius Outb(Vector_Latch, 0); /* Generate INTACK */ 645248724Sglebius 646183693Smav /* Read the vector */ 647183693Smav if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break; 648183693Smav if (vector & 0x01) break; 649183693Smav 650183693Smav scc=&SCC_Info[vector >> 3 ^ 0x01]; 651183693Smav if (!scc->dev) break; 652183693Smav 653143988Sglebius scc_isr_dispatch(scc, vector); 654237227Smelifaro 655237227Smelifaro OutReg(scc->ctrl,R0,RES_H_IUS); /* Reset Highest IUS */ 656237227Smelifaro } 657143988Sglebius 658219182Sglebius if (k == SCC_IRQTIMEOUT) 659143988Sglebius printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n"); 660143924Sglebius 661135332Sglebius return IRQ_HANDLED; 662135332Sglebius } 663143924Sglebius 664143924Sglebius /* Find the SCC generating the interrupt by polling all attached SCCs 665143924Sglebius * reading RR3A (the interrupt pending register) 666143924Sglebius */ 667143924Sglebius 668143924Sglebius ctrl = SCC_ctrl; 669143924Sglebius while (ctrl->chan_A) 670143924Sglebius { 671143924Sglebius if (ctrl->irq != chip_irq) 672143924Sglebius { 673143924Sglebius ctrl++; 674143924Sglebius continue; 675143924Sglebius } 676219182Sglebius 677219182Sglebius scc = NULL; 678143924Sglebius for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++) 679143988Sglebius { 680143924Sglebius vector=InReg(ctrl->chan_B,R2); /* Read the vector */ 681143924Sglebius if (vector & 0x01) break; 682143924Sglebius 683143924Sglebius scc = &SCC_Info[vector >> 3 ^ 0x01]; 684143924Sglebius if (!scc->dev) break; 685143924Sglebius 686143924Sglebius scc_isr_dispatch(scc, vector); 687143924Sglebius } 688135332Sglebius 689135332Sglebius if (k == SCC_IRQTIMEOUT) 690143924Sglebius { 691135332Sglebius printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n"); 692135332Sglebius break; 693135332Sglebius } 694143924Sglebius 695135332Sglebius /* This looks weird and it is. At least the BayCom USCC doesn't 696135332Sglebius * use the Interrupt Daisy Chain, thus we'll have to start 697143924Sglebius * all over again to be sure not to miss an interrupt from 698135332Sglebius * (any of) the other chip(s)... 699135332Sglebius * Honestly, the situation *is* braindamaged... 700135332Sglebius */ 701143924Sglebius 702143924Sglebius if (scc != NULL) 703143924Sglebius { 704237226Smelifaro OutReg(scc->ctrl,R0,RES_H_IUS); 705135332Sglebius ctrl = SCC_ctrl; 706219182Sglebius } else 707219182Sglebius ctrl++; 708219182Sglebius } 709219182Sglebius return IRQ_HANDLED; 710248724Sglebius} 711248724Sglebius 712219182Sglebius 713219182Sglebius 714219182Sglebius/* ******************************************************************** */ 715219182Sglebius/* * Init Channel */ 716237226Smelifaro/* ******************************************************************** */ 717219182Sglebius 718219182Sglebius 719163247Sglebius/* ----> set SCC channel speed <---- */ 720163247Sglebius 721163247Sglebiusstatic inline void set_brg(struct scc_channel *scc, unsigned int tc) 722163247Sglebius{ 723163247Sglebius cl(scc,R14,BRENABL); /* disable baudrate generator */ 724163247Sglebius wr(scc,R12,tc & 255); /* brg rate LOW */ 725163247Sglebius wr(scc,R13,tc >> 8); /* brg rate HIGH */ 726219182Sglebius or(scc,R14,BRENABL); /* enable baudrate generator */ 727237226Smelifaro} 728219182Sglebius 729219182Sglebiusstatic inline void set_speed(struct scc_channel *scc) 730163247Sglebius{ 731163247Sglebius unsigned long flags; 732163247Sglebius spin_lock_irqsave(&scc->lock, flags); 733219182Sglebius 734219182Sglebius if (scc->modem.speed > 0) /* paranoia... */ 735219182Sglebius set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2); 736219182Sglebius 737219182Sglebius spin_unlock_irqrestore(&scc->lock, flags); 738219182Sglebius} 739163247Sglebius 740163247Sglebius 741135332Sglebius/* ----> initialize a SCC channel <---- */ 742143988Sglebius 743135332Sglebiusstatic inline void init_brg(struct scc_channel *scc) 744143924Sglebius{ 745143924Sglebius wr(scc, R14, BRSRC); /* BRG source = PCLK */ 746143924Sglebius OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]); /* DPLL source = BRG */ 747143924Sglebius OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]); /* DPLL NRZI mode */ 748143924Sglebius} 749237226Smelifaro 750219182Sglebius/* 751248724Sglebius * Initialization according to the Z8530 manual (SGS-Thomson's version): 752248724Sglebius * 753248724Sglebius * 1. Modes and constants 754248724Sglebius * 755219182Sglebius * WR9 11000000 chip reset 756219182Sglebius * WR4 XXXXXXXX Tx/Rx control, async or sync mode 757237162Smelifaro * WR1 0XX00X00 select W/REQ (optional) 758219182Sglebius * WR2 XXXXXXXX program interrupt vector 759219182Sglebius * WR3 XXXXXXX0 select Rx control 760219182Sglebius * WR5 XXXX0XXX select Tx control 761143924Sglebius * WR6 XXXXXXXX sync character 762143924Sglebius * WR7 XXXXXXXX sync character 763143988Sglebius * WR9 000X0XXX select interrupt control 764143924Sglebius * WR10 XXXXXXXX miscellaneous control (optional) 765143924Sglebius * WR11 XXXXXXXX clock control 766135332Sglebius * WR12 XXXXXXXX time constant lower byte (optional) 767219182Sglebius * WR13 XXXXXXXX time constant upper byte (optional) 768219182Sglebius * WR14 XXXXXXX0 miscellaneous control 769219182Sglebius * WR14 XXXSSSSS commands (optional) 770219182Sglebius * 771219182Sglebius * 2. Enables 772219182Sglebius * 773148091Sglebius * WR14 000SSSS1 baud rate enable 774219182Sglebius * WR3 SSSSSSS1 Rx enable 775148091Sglebius * WR5 SSSS1SSS Tx enable 776148091Sglebius * WR0 10000000 reset Tx CRG (optional) 777219182Sglebius * WR1 XSS00S00 DMA enable (optional) 778143924Sglebius * 779219182Sglebius * 3. Interrupt status 780219182Sglebius * 781219182Sglebius * WR15 XXXXXXXX enable external/status 782219182Sglebius * WR0 00010000 reset external status 783219182Sglebius * WR0 00010000 reset external status twice 784248724Sglebius * WR1 SSSXXSXX enable Rx, Tx and Ext/status 785248724Sglebius * WR9 000SXSSS enable master interrupt enable 786219182Sglebius * 787148091Sglebius * 1 = set to one, 0 = reset to zero 788148091Sglebius * X = user defined, S = same as previous init 789148091Sglebius * 790148091Sglebius * 791148091Sglebius * Note that the implementation differs in some points from above scheme. 792148091Sglebius * 793148091Sglebius */ 794219182Sglebius 795219182Sglebiusstatic void init_channel(struct scc_channel *scc) 796219182Sglebius{ 797148091Sglebius del_timer(&scc->tx_t); 798219182Sglebius del_timer(&scc->tx_wdog); 799248724Sglebius 800248724Sglebius disable_irq(scc->irq); 801248724Sglebius 802248724Sglebius wr(scc,R4,X1CLK|SDLC); /* *1 clock, SDLC mode */ 803237227Smelifaro wr(scc,R1,0); /* no W/REQ operation */ 804219182Sglebius wr(scc,R3,Rx8|RxCRC_ENAB); /* RX 8 bits/char, CRC, disabled */ 805219182Sglebius wr(scc,R5,Tx8|DTR|TxCRC_ENAB); /* TX 8 bits/char, disabled, DTR */ 806219182Sglebius wr(scc,R6,0); /* SDLC address zero (not used) */ 807219182Sglebius wr(scc,R7,FLAG); /* SDLC flag value */ 808219182Sglebius wr(scc,R9,VIS); /* vector includes status */ 809219182Sglebius wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */ 810219182Sglebius wr(scc,R14, 0); 811219182Sglebius 812219182Sglebius 813143924Sglebius/* set clock sources: 814248724Sglebius 815248724Sglebius CLK_DPLL: normal halfduplex operation 816248724Sglebius 817248724Sglebius RxClk: use DPLL 818219182Sglebius TxClk: use DPLL 819219182Sglebius TRxC mode DPLL output 820163247Sglebius 821219182Sglebius CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem) 822219182Sglebius 823219182Sglebius BayCom: others: 824248724Sglebius 825248724Sglebius TxClk = pin RTxC TxClk = pin TRxC 826248724Sglebius RxClk = pin TRxC RxClk = pin RTxC 827248724Sglebius 828248724Sglebius 829219182Sglebius CLK_DIVIDER: 830219182Sglebius RxClk = use DPLL 831248724Sglebius TxClk = pin RTxC 832248724Sglebius 833219182Sglebius BayCom: others: 834219182Sglebius pin TRxC = DPLL pin TRxC = BRG 835219182Sglebius (RxClk * 1) (RxClk * 32) 836219182Sglebius*/ 837219182Sglebius 838219182Sglebius 839219182Sglebius switch(scc->modem.clocksrc) 840219182Sglebius { 841219182Sglebius case CLK_DPLL: 842219182Sglebius wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP); 843219182Sglebius init_brg(scc); 844219182Sglebius break; 845219182Sglebius 846219182Sglebius case CLK_DIVIDER: 847219182Sglebius wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI); 848219182Sglebius init_brg(scc); 849248724Sglebius break; 850248724Sglebius 851219182Sglebius case CLK_EXTERNAL: 852219182Sglebius wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP); 853219182Sglebius OutReg(scc->ctrl, R14, DISDPLL); 854219182Sglebius break; 855219182Sglebius 856219182Sglebius } 857219182Sglebius 858248724Sglebius set_speed(scc); /* set baudrate */ 859248724Sglebius 860219182Sglebius if(scc->enhanced) 861219182Sglebius { 862219182Sglebius or(scc,R15,SHDLCE|FIFOE); /* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */ 863219182Sglebius wr(scc,R7,AUTOEOM); 864219182Sglebius } 865219182Sglebius 866248724Sglebius if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD)) 867248724Sglebius /* DCD is now ON */ 868219182Sglebius { 869219182Sglebius start_hunt(scc); 870219182Sglebius } 871237227Smelifaro 872219182Sglebius /* enable ABORT, DCD & SYNC/HUNT interrupts */ 873219182Sglebius 874219182Sglebius wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE)); 875219182Sglebius 876219182Sglebius Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */ 877219182Sglebius Outb(scc->ctrl,RES_EXT_INT); /* must be done twice */ 878237226Smelifaro 879241369Skevlo or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */ 880237226Smelifaro 881237226Smelifaro scc->status = InReg(scc->ctrl,R0); /* read initial status */ 882219182Sglebius 883219182Sglebius or(scc,R9,MIE); /* master interrupt enable */ 884219182Sglebius 885219182Sglebius scc_init_timer(scc); 886219182Sglebius 887219182Sglebius enable_irq(scc->irq); 888163247Sglebius} 889219182Sglebius 890135332Sglebius 891143924Sglebius 892135332Sglebius 893219182Sglebius/* ******************************************************************** */ 894219182Sglebius/* * SCC timer functions * */ 895219182Sglebius/* ******************************************************************** */ 896219182Sglebius 897219182Sglebius 898219182Sglebius/* ----> scc_key_trx sets the time constant for the baudrate 899237226Smelifaro generator and keys the transmitter <---- */ 900237226Smelifaro 901237226Smelifarostatic void scc_key_trx(struct scc_channel *scc, char tx) 902237226Smelifaro{ 903237226Smelifaro unsigned int time_const; 904219182Sglebius 905219182Sglebius if (scc->brand & PRIMUS) 906219182Sglebius Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0)); 907219182Sglebius 908183693Smav if (scc->modem.speed < 300) 909183693Smav scc->modem.speed = 1200; 910183693Smav 911183693Smav time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2; 912183693Smav 913183693Smav disable_irq(scc->irq); 914183693Smav 915219182Sglebius if (tx) 916219182Sglebius { 917219182Sglebius or(scc, R1, TxINT_ENAB); /* t_maxkeyup may have reset these */ 918232921Smelifaro or(scc, R15, TxUIE); 919232921Smelifaro } 920232921Smelifaro 921232921Smelifaro if (scc->modem.clocksrc == CLK_DPLL) 922219182Sglebius { /* force simplex operation */ 923219182Sglebius if (tx) 924135332Sglebius { 925219182Sglebius#ifdef CONFIG_SCC_TRXECHO 926219182Sglebius cl(scc, R3, RxENABLE|ENT_HM); /* switch off receiver */ 927219182Sglebius cl(scc, R15, DCDIE|SYNCIE); /* No DCD changes, please */ 928219182Sglebius#endif 929219182Sglebius set_brg(scc, time_const); /* reprogram baudrate generator */ 930219182Sglebius 931183693Smav /* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */ 932219182Sglebius wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR); 933219182Sglebius 934219182Sglebius /* By popular demand: tx_inhibit */ 935219182Sglebius if (scc->kiss.tx_inhibit) 936248724Sglebius { 937248724Sglebius or(scc,R5, TxENAB); 938219182Sglebius scc->wreg[R5] |= RTS; 939219182Sglebius } else { 940248724Sglebius or(scc,R5,RTS|TxENAB); /* set the RTS line and enable TX */ 941248724Sglebius } 942219182Sglebius } else { 943219182Sglebius cl(scc,R5,RTS|TxENAB); 944219182Sglebius 945219182Sglebius set_brg(scc, time_const); /* reprogram baudrate generator */ 946219182Sglebius 947143988Sglebius /* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */ 948183693Smav wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP); 949219182Sglebius 950219182Sglebius#ifndef CONFIG_SCC_TRXECHO 951219182Sglebius if (scc->kiss.softdcd) 952248724Sglebius#endif 953248724Sglebius { 954219182Sglebius or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE); 955219182Sglebius start_hunt(scc); 956248724Sglebius } 957248724Sglebius } 958219182Sglebius } else { 959219182Sglebius if (tx) 960219182Sglebius { 961219182Sglebius#ifdef CONFIG_SCC_TRXECHO 962143988Sglebius if (scc->kiss.fulldup == KISS_DUPLEX_HALF) 963183693Smav { 964143988Sglebius cl(scc, R3, RxENABLE); 965143988Sglebius cl(scc, R15, DCDIE|SYNCIE); 966135332Sglebius } 967143912Sglebius#endif 968143912Sglebius 969143912Sglebius if (scc->kiss.tx_inhibit) 970135332Sglebius { 971135332Sglebius or(scc,R5, TxENAB); 972135332Sglebius scc->wreg[R5] |= RTS; 973135332Sglebius } else { 974135332Sglebius or(scc,R5,RTS|TxENAB); /* enable tx */ 975135332Sglebius } 976135332Sglebius } else { 977135332Sglebius cl(scc,R5,RTS|TxENAB); /* disable tx */ 978135332Sglebius 979135332Sglebius if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) && 980135332Sglebius#ifndef CONFIG_SCC_TRXECHO 981135332Sglebius scc->kiss.softdcd) 982135332Sglebius#else 983135332Sglebius 1) 984135332Sglebius#endif 985135332Sglebius { 986135332Sglebius or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE); 987135332Sglebius start_hunt(scc); 988135332Sglebius } 989135332Sglebius } 990135332Sglebius } 991135332Sglebius 992135332Sglebius enable_irq(scc->irq); 993135332Sglebius} 994135332Sglebius 995135332Sglebius 996232921Smelifaro/* ----> SCC timer interrupt handler and friends. <---- */ 997184205Sdes 998135332Sglebiusstatic void __scc_start_tx_timer(struct scc_channel *scc, 999135332Sglebius void (*handler)(struct timer_list *t), 1000135332Sglebius unsigned long when) 1001135332Sglebius{ 1002135332Sglebius del_timer(&scc->tx_t); 1003135332Sglebius 1004135332Sglebius if (when == 0) 1005135332Sglebius { 1006135332Sglebius handler(&scc->tx_t); 1007135332Sglebius } else 1008135332Sglebius if (when != TIMER_OFF) 1009135332Sglebius { 1010153791Sglebius scc->tx_t.function = handler; 1011153791Sglebius scc->tx_t.expires = jiffies + (when*HZ)/100; 1012153791Sglebius add_timer(&scc->tx_t); 1013153791Sglebius } 1014153791Sglebius} 1015153791Sglebius 1016135332Sglebiusstatic void scc_start_tx_timer(struct scc_channel *scc, 1017175934Smav void (*handler)(struct timer_list *t), 1018175934Smav unsigned long when) 1019219182Sglebius{ 1020219182Sglebius unsigned long flags; 1021135332Sglebius 1022175934Smav spin_lock_irqsave(&scc->lock, flags); 1023135332Sglebius __scc_start_tx_timer(scc, handler, when); 1024219182Sglebius spin_unlock_irqrestore(&scc->lock, flags); 1025219182Sglebius} 1026219182Sglebius 1027219182Sglebiusstatic void scc_start_defer(struct scc_channel *scc) 1028219182Sglebius{ 1029219182Sglebius unsigned long flags; 1030135332Sglebius 1031135332Sglebius spin_lock_irqsave(&scc->lock, flags); 1032135332Sglebius del_timer(&scc->tx_wdog); 1033135332Sglebius 1034135332Sglebius if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF) 1035135332Sglebius { 1036 scc->tx_wdog.function = t_busy; 1037 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer; 1038 add_timer(&scc->tx_wdog); 1039 } 1040 spin_unlock_irqrestore(&scc->lock, flags); 1041} 1042 1043static void scc_start_maxkeyup(struct scc_channel *scc) 1044{ 1045 unsigned long flags; 1046 1047 spin_lock_irqsave(&scc->lock, flags); 1048 del_timer(&scc->tx_wdog); 1049 1050 if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF) 1051 { 1052 scc->tx_wdog.function = t_maxkeyup; 1053 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup; 1054 add_timer(&scc->tx_wdog); 1055 } 1056 spin_unlock_irqrestore(&scc->lock, flags); 1057} 1058 1059/* 1060 * This is called from scc_txint() when there are no more frames to send. 1061 * Not exactly a timer function, but it is a close friend of the family... 1062 */ 1063 1064static void scc_tx_done(struct scc_channel *scc) 1065{ 1066 /* 1067 * trx remains keyed in fulldup mode 2 until t_idle expires. 1068 */ 1069 1070 switch (scc->kiss.fulldup) 1071 { 1072 case KISS_DUPLEX_LINK: 1073 scc->stat.tx_state = TXS_IDLE2; 1074 if (scc->kiss.idletime != TIMER_OFF) 1075 scc_start_tx_timer(scc, t_idle, 1076 scc->kiss.idletime*100); 1077 break; 1078 case KISS_DUPLEX_OPTIMA: 1079 scc_notify(scc, HWEV_ALL_SENT); 1080 break; 1081 default: 1082 scc->stat.tx_state = TXS_BUSY; 1083 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime); 1084 } 1085 1086 netif_wake_queue(scc->dev); 1087} 1088 1089 1090static unsigned char Rand = 17; 1091 1092static inline int is_grouped(struct scc_channel *scc) 1093{ 1094 int k; 1095 struct scc_channel *scc2; 1096 unsigned char grp1, grp2; 1097 1098 grp1 = scc->kiss.group; 1099 1100 for (k = 0; k < (Nchips * 2); k++) 1101 { 1102 scc2 = &SCC_Info[k]; 1103 grp2 = scc2->kiss.group; 1104 1105 if (scc2 == scc || !(scc2->dev && grp2)) 1106 continue; 1107 1108 if ((grp1 & 0x3f) == (grp2 & 0x3f)) 1109 { 1110 if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) ) 1111 return 1; 1112 1113 if ( (grp1 & RXGROUP) && scc2->dcd ) 1114 return 1; 1115 } 1116 } 1117 return 0; 1118} 1119 1120/* DWAIT and SLOTTIME expired 1121 * 1122 * fulldup == 0: DCD is active or Rand > P-persistence: start t_busy timer 1123 * else key trx and start txdelay 1124 * fulldup == 1: key trx and start txdelay 1125 * fulldup == 2: mintime expired, reset status or key trx and start txdelay 1126 */ 1127 1128static void t_dwait(struct timer_list *t) 1129{ 1130 struct scc_channel *scc = from_timer(scc, t, tx_t); 1131 1132 if (scc->stat.tx_state == TXS_WAIT) /* maxkeyup or idle timeout */ 1133 { 1134 if (skb_queue_empty(&scc->tx_queue)) { /* nothing to send */ 1135 scc->stat.tx_state = TXS_IDLE; 1136 netif_wake_queue(scc->dev); /* t_maxkeyup locked it. */ 1137 return; 1138 } 1139 1140 scc->stat.tx_state = TXS_BUSY; 1141 } 1142 1143 if (scc->kiss.fulldup == KISS_DUPLEX_HALF) 1144 { 1145 Rand = Rand * 17 + 31; 1146 1147 if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) ) 1148 { 1149 scc_start_defer(scc); 1150 scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime); 1151 return ; 1152 } 1153 } 1154 1155 if ( !(scc->wreg[R5] & RTS) ) 1156 { 1157 scc_key_trx(scc, TX_ON); 1158 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay); 1159 } else { 1160 scc_start_tx_timer(scc, t_txdelay, 0); 1161 } 1162} 1163 1164 1165/* TXDELAY expired 1166 * 1167 * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog. 1168 */ 1169 1170static void t_txdelay(struct timer_list *t) 1171{ 1172 struct scc_channel *scc = from_timer(scc, t, tx_t); 1173 1174 scc_start_maxkeyup(scc); 1175 1176 if (scc->tx_buff == NULL) 1177 { 1178 disable_irq(scc->irq); 1179 scc_txint(scc); 1180 enable_irq(scc->irq); 1181 } 1182} 1183 1184 1185/* TAILTIME expired 1186 * 1187 * switch off transmitter. If we were stopped by Maxkeyup restart 1188 * transmission after 'mintime' seconds 1189 */ 1190 1191static void t_tail(struct timer_list *t) 1192{ 1193 struct scc_channel *scc = from_timer(scc, t, tx_t); 1194 unsigned long flags; 1195 1196 spin_lock_irqsave(&scc->lock, flags); 1197 del_timer(&scc->tx_wdog); 1198 scc_key_trx(scc, TX_OFF); 1199 spin_unlock_irqrestore(&scc->lock, flags); 1200 1201 if (scc->stat.tx_state == TXS_TIMEOUT) /* we had a timeout? */ 1202 { 1203 scc->stat.tx_state = TXS_WAIT; 1204 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100); 1205 return; 1206 } 1207 1208 scc->stat.tx_state = TXS_IDLE; 1209 netif_wake_queue(scc->dev); 1210} 1211 1212 1213/* BUSY timeout 1214 * 1215 * throw away send buffers if DCD remains active too long. 1216 */ 1217 1218static void t_busy(struct timer_list *t) 1219{ 1220 struct scc_channel *scc = from_timer(scc, t, tx_wdog); 1221 1222 del_timer(&scc->tx_t); 1223 netif_stop_queue(scc->dev); /* don't pile on the wabbit! */ 1224 1225 scc_discard_buffers(scc); 1226 scc->stat.txerrs++; 1227 scc->stat.tx_state = TXS_IDLE; 1228 1229 netif_wake_queue(scc->dev); 1230} 1231 1232/* MAXKEYUP timeout 1233 * 1234 * this is our watchdog. 1235 */ 1236 1237static void t_maxkeyup(struct timer_list *t) 1238{ 1239 struct scc_channel *scc = from_timer(scc, t, tx_wdog); 1240 unsigned long flags; 1241 1242 spin_lock_irqsave(&scc->lock, flags); 1243 /* 1244 * let things settle down before we start to 1245 * accept new data. 1246 */ 1247 1248 netif_stop_queue(scc->dev); 1249 scc_discard_buffers(scc); 1250 1251 del_timer(&scc->tx_t); 1252 1253 cl(scc, R1, TxINT_ENAB); /* force an ABORT, but don't */ 1254 cl(scc, R15, TxUIE); /* count it. */ 1255 OutReg(scc->ctrl, R0, RES_Tx_P); 1256 1257 spin_unlock_irqrestore(&scc->lock, flags); 1258 1259 scc->stat.txerrs++; 1260 scc->stat.tx_state = TXS_TIMEOUT; 1261 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime); 1262} 1263 1264/* IDLE timeout 1265 * 1266 * in fulldup mode 2 it keys down the transmitter after 'idle' seconds 1267 * of inactivity. We will not restart transmission before 'mintime' 1268 * expires. 1269 */ 1270 1271static void t_idle(struct timer_list *t) 1272{ 1273 struct scc_channel *scc = from_timer(scc, t, tx_t); 1274 1275 del_timer(&scc->tx_wdog); 1276 1277 scc_key_trx(scc, TX_OFF); 1278 if(scc->kiss.mintime) 1279 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100); 1280 scc->stat.tx_state = TXS_WAIT; 1281} 1282 1283static void scc_init_timer(struct scc_channel *scc) 1284{ 1285 unsigned long flags; 1286 1287 spin_lock_irqsave(&scc->lock, flags); 1288 scc->stat.tx_state = TXS_IDLE; 1289 spin_unlock_irqrestore(&scc->lock, flags); 1290} 1291 1292 1293/* ******************************************************************** */ 1294/* * Set/get L1 parameters * */ 1295/* ******************************************************************** */ 1296 1297 1298/* 1299 * this will set the "hardware" parameters through KISS commands or ioctl() 1300 */ 1301 1302#define CAST(x) (unsigned long)(x) 1303 1304static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg) 1305{ 1306 switch (cmd) 1307 { 1308 case PARAM_TXDELAY: scc->kiss.txdelay=arg; break; 1309 case PARAM_PERSIST: scc->kiss.persist=arg; break; 1310 case PARAM_SLOTTIME: scc->kiss.slottime=arg; break; 1311 case PARAM_TXTAIL: scc->kiss.tailtime=arg; break; 1312 case PARAM_FULLDUP: scc->kiss.fulldup=arg; break; 1313 case PARAM_DTR: break; /* does someone need this? */ 1314 case PARAM_GROUP: scc->kiss.group=arg; break; 1315 case PARAM_IDLE: scc->kiss.idletime=arg; break; 1316 case PARAM_MIN: scc->kiss.mintime=arg; break; 1317 case PARAM_MAXKEY: scc->kiss.maxkeyup=arg; break; 1318 case PARAM_WAIT: scc->kiss.waittime=arg; break; 1319 case PARAM_MAXDEFER: scc->kiss.maxdefer=arg; break; 1320 case PARAM_TX: scc->kiss.tx_inhibit=arg; break; 1321 1322 case PARAM_SOFTDCD: 1323 scc->kiss.softdcd=arg; 1324 if (arg) 1325 { 1326 or(scc, R15, SYNCIE); 1327 cl(scc, R15, DCDIE); 1328 start_hunt(scc); 1329 } else { 1330 or(scc, R15, DCDIE); 1331 cl(scc, R15, SYNCIE); 1332 } 1333 break; 1334 1335 case PARAM_SPEED: 1336 if (arg < 256) 1337 scc->modem.speed=arg*100; 1338 else 1339 scc->modem.speed=arg; 1340 1341 if (scc->stat.tx_state == 0) /* only switch baudrate on rx... ;-) */ 1342 set_speed(scc); 1343 break; 1344 1345 case PARAM_RTS: 1346 if ( !(scc->wreg[R5] & RTS) ) 1347 { 1348 if (arg != TX_OFF) { 1349 scc_key_trx(scc, TX_ON); 1350 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay); 1351 } 1352 } else { 1353 if (arg == TX_OFF) 1354 { 1355 scc->stat.tx_state = TXS_BUSY; 1356 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime); 1357 } 1358 } 1359 break; 1360 1361 case PARAM_HWEVENT: 1362 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF); 1363 break; 1364 1365 default: return -EINVAL; 1366 } 1367 1368 return 0; 1369} 1370 1371 1372 1373static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd) 1374{ 1375 switch (cmd) 1376 { 1377 case PARAM_TXDELAY: return CAST(scc->kiss.txdelay); 1378 case PARAM_PERSIST: return CAST(scc->kiss.persist); 1379 case PARAM_SLOTTIME: return CAST(scc->kiss.slottime); 1380 case PARAM_TXTAIL: return CAST(scc->kiss.tailtime); 1381 case PARAM_FULLDUP: return CAST(scc->kiss.fulldup); 1382 case PARAM_SOFTDCD: return CAST(scc->kiss.softdcd); 1383 case PARAM_DTR: return CAST((scc->wreg[R5] & DTR)? 1:0); 1384 case PARAM_RTS: return CAST((scc->wreg[R5] & RTS)? 1:0); 1385 case PARAM_SPEED: return CAST(scc->modem.speed); 1386 case PARAM_GROUP: return CAST(scc->kiss.group); 1387 case PARAM_IDLE: return CAST(scc->kiss.idletime); 1388 case PARAM_MIN: return CAST(scc->kiss.mintime); 1389 case PARAM_MAXKEY: return CAST(scc->kiss.maxkeyup); 1390 case PARAM_WAIT: return CAST(scc->kiss.waittime); 1391 case PARAM_MAXDEFER: return CAST(scc->kiss.maxdefer); 1392 case PARAM_TX: return CAST(scc->kiss.tx_inhibit); 1393 default: return NO_SUCH_PARAM; 1394 } 1395 1396} 1397 1398#undef CAST 1399 1400/* ******************************************************************* */ 1401/* * Send calibration pattern * */ 1402/* ******************************************************************* */ 1403 1404static void scc_stop_calibrate(struct timer_list *t) 1405{ 1406 struct scc_channel *scc = from_timer(scc, t, tx_wdog); 1407 unsigned long flags; 1408 1409 spin_lock_irqsave(&scc->lock, flags); 1410 del_timer(&scc->tx_wdog); 1411 scc_key_trx(scc, TX_OFF); 1412 wr(scc, R6, 0); 1413 wr(scc, R7, FLAG); 1414 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */ 1415 Outb(scc->ctrl,RES_EXT_INT); 1416 1417 netif_wake_queue(scc->dev); 1418 spin_unlock_irqrestore(&scc->lock, flags); 1419} 1420 1421 1422static void 1423scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern) 1424{ 1425 unsigned long flags; 1426 1427 spin_lock_irqsave(&scc->lock, flags); 1428 netif_stop_queue(scc->dev); 1429 scc_discard_buffers(scc); 1430 1431 del_timer(&scc->tx_wdog); 1432 1433 scc->tx_wdog.function = scc_stop_calibrate; 1434 scc->tx_wdog.expires = jiffies + HZ*duration; 1435 add_timer(&scc->tx_wdog); 1436 1437 /* This doesn't seem to work. Why not? */ 1438 wr(scc, R6, 0); 1439 wr(scc, R7, pattern); 1440 1441 /* 1442 * Don't know if this works. 1443 * Damn, where is my Z8530 programming manual...? 1444 */ 1445 1446 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */ 1447 Outb(scc->ctrl,RES_EXT_INT); 1448 1449 scc_key_trx(scc, TX_ON); 1450 spin_unlock_irqrestore(&scc->lock, flags); 1451} 1452 1453/* ******************************************************************* */ 1454/* * Init channel structures, special HW, etc... * */ 1455/* ******************************************************************* */ 1456 1457/* 1458 * Reset the Z8530s and setup special hardware 1459 */ 1460 1461static void z8530_init(void) 1462{ 1463 struct scc_channel *scc; 1464 int chip, k; 1465 unsigned long flags; 1466 char *flag; 1467 1468 1469 printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2); 1470 1471 flag=" "; 1472 for (k = 0; k < nr_irqs; k++) 1473 if (Ivec[k].used) 1474 { 1475 printk("%s%d", flag, k); 1476 flag=","; 1477 } 1478 printk("\n"); 1479 1480 1481 /* reset and pre-init all chips in the system */ 1482 for (chip = 0; chip < Nchips; chip++) 1483 { 1484 scc=&SCC_Info[2*chip]; 1485 if (!scc->ctrl) continue; 1486 1487 /* Special SCC cards */ 1488 1489 if(scc->brand & EAGLE) /* this is an EAGLE card */ 1490 Outb(scc->special,0x08); /* enable interrupt on the board */ 1491 1492 if(scc->brand & (PC100 | PRIMUS)) /* this is a PC100/PRIMUS card */ 1493 Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */ 1494 1495 1496 /* Reset and pre-init Z8530 */ 1497 1498 spin_lock_irqsave(&scc->lock, flags); 1499 1500 Outb(scc->ctrl, 0); 1501 OutReg(scc->ctrl,R9,FHWRES); /* force hardware reset */ 1502 udelay(100); /* give it 'a bit' more time than required */ 1503 wr(scc, R2, chip*16); /* interrupt vector */ 1504 wr(scc, R9, VIS); /* vector includes status */ 1505 spin_unlock_irqrestore(&scc->lock, flags); 1506 } 1507 1508 1509 Driver_Initialized = 1; 1510} 1511 1512/* 1513 * Allocate device structure, err, instance, and register driver 1514 */ 1515 1516static int scc_net_alloc(const char *name, struct scc_channel *scc) 1517{ 1518 int err; 1519 struct net_device *dev; 1520 1521 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, scc_net_setup); 1522 if (!dev) 1523 return -ENOMEM; 1524 1525 dev->ml_priv = scc; 1526 scc->dev = dev; 1527 spin_lock_init(&scc->lock); 1528 timer_setup(&scc->tx_t, NULL, 0); 1529 timer_setup(&scc->tx_wdog, NULL, 0); 1530 1531 err = register_netdevice(dev); 1532 if (err) { 1533 printk(KERN_ERR "%s: can't register network device (%d)\n", 1534 name, err); 1535 free_netdev(dev); 1536 scc->dev = NULL; 1537 return err; 1538 } 1539 1540 return 0; 1541} 1542 1543 1544 1545/* ******************************************************************** */ 1546/* * Network driver methods * */ 1547/* ******************************************************************** */ 1548 1549static const struct net_device_ops scc_netdev_ops = { 1550 .ndo_open = scc_net_open, 1551 .ndo_stop = scc_net_close, 1552 .ndo_start_xmit = scc_net_tx, 1553 .ndo_set_mac_address = scc_net_set_mac_address, 1554 .ndo_get_stats = scc_net_get_stats, 1555 .ndo_siocdevprivate = scc_net_siocdevprivate, 1556}; 1557 1558/* ----> Initialize device <----- */ 1559 1560static void scc_net_setup(struct net_device *dev) 1561{ 1562 dev->tx_queue_len = 16; /* should be enough... */ 1563 1564 dev->netdev_ops = &scc_netdev_ops; 1565 dev->header_ops = &ax25_header_ops; 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 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); 1575 dev_addr_set(dev, (u8 *)&ax25_defaddr); 1576} 1577 1578/* ----> open network device <---- */ 1579 1580static int scc_net_open(struct net_device *dev) 1581{ 1582 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv; 1583 1584 if (!scc->init) 1585 return -EINVAL; 1586 1587 scc->tx_buff = NULL; 1588 skb_queue_head_init(&scc->tx_queue); 1589 1590 init_channel(scc); 1591 1592 netif_start_queue(dev); 1593 return 0; 1594} 1595 1596/* ----> close network device <---- */ 1597 1598static int scc_net_close(struct net_device *dev) 1599{ 1600 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv; 1601 unsigned long flags; 1602 1603 netif_stop_queue(dev); 1604 1605 spin_lock_irqsave(&scc->lock, flags); 1606 Outb(scc->ctrl,0); /* Make sure pointer is written */ 1607 wr(scc,R1,0); /* disable interrupts */ 1608 wr(scc,R3,0); 1609 spin_unlock_irqrestore(&scc->lock, flags); 1610 1611 del_timer_sync(&scc->tx_t); 1612 del_timer_sync(&scc->tx_wdog); 1613 1614 scc_discard_buffers(scc); 1615 1616 return 0; 1617} 1618 1619/* ----> receive frame, called from scc_rxint() <---- */ 1620 1621static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb) 1622{ 1623 if (skb->len == 0) { 1624 dev_kfree_skb_irq(skb); 1625 return; 1626 } 1627 1628 scc->dev_stat.rx_packets++; 1629 scc->dev_stat.rx_bytes += skb->len; 1630 1631 skb->protocol = ax25_type_trans(skb, scc->dev); 1632 1633 netif_rx(skb); 1634} 1635 1636/* ----> transmit frame <---- */ 1637 1638static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev) 1639{ 1640 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv; 1641 unsigned long flags; 1642 char kisscmd; 1643 1644 if (skb->protocol == htons(ETH_P_IP)) 1645 return ax25_ip_xmit(skb); 1646 1647 if (skb->len > scc->stat.bufsize || skb->len < 2) { 1648 scc->dev_stat.tx_dropped++; /* bogus frame */ 1649 dev_kfree_skb(skb); 1650 return NETDEV_TX_OK; 1651 } 1652 1653 scc->dev_stat.tx_packets++; 1654 scc->dev_stat.tx_bytes += skb->len; 1655 scc->stat.txframes++; 1656 1657 kisscmd = *skb->data & 0x1f; 1658 skb_pull(skb, 1); 1659 1660 if (kisscmd) { 1661 scc_set_param(scc, kisscmd, *skb->data); 1662 dev_kfree_skb(skb); 1663 return NETDEV_TX_OK; 1664 } 1665 1666 spin_lock_irqsave(&scc->lock, flags); 1667 1668 if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) { 1669 struct sk_buff *skb_del; 1670 skb_del = skb_dequeue(&scc->tx_queue); 1671 dev_kfree_skb_irq(skb_del); 1672 } 1673 skb_queue_tail(&scc->tx_queue, skb); 1674 netif_trans_update(dev); 1675 1676 1677 /* 1678 * Start transmission if the trx state is idle or 1679 * t_idle hasn't expired yet. Use dwait/persistence/slottime 1680 * algorithm for normal halfduplex operation. 1681 */ 1682 1683 if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) { 1684 scc->stat.tx_state = TXS_BUSY; 1685 if (scc->kiss.fulldup == KISS_DUPLEX_HALF) 1686 __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime); 1687 else 1688 __scc_start_tx_timer(scc, t_dwait, 0); 1689 } 1690 spin_unlock_irqrestore(&scc->lock, flags); 1691 return NETDEV_TX_OK; 1692} 1693 1694/* ----> ioctl functions <---- */ 1695 1696/* 1697 * SIOCSCCCFG - configure driver arg: (struct scc_hw_config *) arg 1698 * SIOCSCCINI - initialize driver arg: --- 1699 * SIOCSCCCHANINI - initialize channel arg: (struct scc_modem *) arg 1700 * SIOCSCCSMEM - set memory arg: (struct scc_mem_config *) arg 1701 * SIOCSCCGKISS - get level 1 parameter arg: (struct scc_kiss_cmd *) arg 1702 * SIOCSCCSKISS - set level 1 parameter arg: (struct scc_kiss_cmd *) arg 1703 * SIOCSCCGSTAT - get driver status arg: (struct scc_stat *) arg 1704 * SIOCSCCCAL - send calib. pattern arg: (struct scc_calibrate *) arg 1705 */ 1706 1707static int scc_net_siocdevprivate(struct net_device *dev, 1708 struct ifreq *ifr, void __user *arg, int cmd) 1709{ 1710 struct scc_kiss_cmd kiss_cmd; 1711 struct scc_mem_config memcfg; 1712 struct scc_hw_config hwcfg; 1713 struct scc_calibrate cal; 1714 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv; 1715 int chan; 1716 unsigned char device_name[IFNAMSIZ]; 1717 1718 if (!Driver_Initialized) 1719 { 1720 if (cmd == SIOCSCCCFG) 1721 { 1722 int found = 1; 1723 1724 if (!capable(CAP_SYS_RAWIO)) return -EPERM; 1725 if (in_compat_syscall()) 1726 return -EOPNOTSUPP; 1727 1728 if (!arg) return -EFAULT; 1729 1730 if (Nchips >= SCC_MAXCHIPS) 1731 return -EINVAL; 1732 1733 if (copy_from_user(&hwcfg, arg, sizeof(hwcfg))) 1734 return -EFAULT; 1735 1736 if (hwcfg.irq == 2) hwcfg.irq = 9; 1737 1738 if (hwcfg.irq < 0 || hwcfg.irq >= nr_irqs) 1739 return -EINVAL; 1740 1741 if (!Ivec[hwcfg.irq].used && hwcfg.irq) 1742 { 1743 if (request_irq(hwcfg.irq, scc_isr, 1744 0, "AX.25 SCC", 1745 (void *)(long) hwcfg.irq)) 1746 printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq); 1747 else 1748 Ivec[hwcfg.irq].used = 1; 1749 } 1750 1751 if (hwcfg.vector_latch && !Vector_Latch) { 1752 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch")) 1753 printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch); 1754 else 1755 Vector_Latch = hwcfg.vector_latch; 1756 } 1757 1758 if (hwcfg.clock == 0) 1759 hwcfg.clock = SCC_DEFAULT_CLOCK; 1760 1761#ifndef SCC_DONT_CHECK 1762 1763 if(request_region(hwcfg.ctrl_a, 1, "scc-probe")) 1764 { 1765 disable_irq(hwcfg.irq); 1766 Outb(hwcfg.ctrl_a, 0); 1767 OutReg(hwcfg.ctrl_a, R9, FHWRES); 1768 udelay(100); 1769 OutReg(hwcfg.ctrl_a,R13,0x55); /* is this chip really there? */ 1770 udelay(5); 1771 1772 if (InReg(hwcfg.ctrl_a,R13) != 0x55) 1773 found = 0; 1774 enable_irq(hwcfg.irq); 1775 release_region(hwcfg.ctrl_a, 1); 1776 } 1777 else 1778 found = 0; 1779#endif 1780 1781 if (found) 1782 { 1783 SCC_Info[2*Nchips ].ctrl = hwcfg.ctrl_a; 1784 SCC_Info[2*Nchips ].data = hwcfg.data_a; 1785 SCC_Info[2*Nchips ].irq = hwcfg.irq; 1786 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b; 1787 SCC_Info[2*Nchips+1].data = hwcfg.data_b; 1788 SCC_Info[2*Nchips+1].irq = hwcfg.irq; 1789 1790 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a; 1791 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b; 1792 SCC_ctrl[Nchips].irq = hwcfg.irq; 1793 } 1794 1795 1796 for (chan = 0; chan < 2; chan++) 1797 { 1798 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan); 1799 1800 SCC_Info[2*Nchips+chan].special = hwcfg.special; 1801 SCC_Info[2*Nchips+chan].clock = hwcfg.clock; 1802 SCC_Info[2*Nchips+chan].brand = hwcfg.brand; 1803 SCC_Info[2*Nchips+chan].option = hwcfg.option; 1804 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc; 1805 1806#ifdef SCC_DONT_CHECK 1807 printk(KERN_INFO "%s: data port = 0x%3.3x control port = 0x%3.3x\n", 1808 device_name, 1809 SCC_Info[2*Nchips+chan].data, 1810 SCC_Info[2*Nchips+chan].ctrl); 1811 1812#else 1813 printk(KERN_INFO "%s: data port = 0x%3.3lx control port = 0x%3.3lx -- %s\n", 1814 device_name, 1815 chan? hwcfg.data_b : hwcfg.data_a, 1816 chan? hwcfg.ctrl_b : hwcfg.ctrl_a, 1817 found? "found" : "missing"); 1818#endif 1819 1820 if (found) 1821 { 1822 request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl"); 1823 request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data"); 1824 if (Nchips+chan != 0 && 1825 scc_net_alloc(device_name, 1826 &SCC_Info[2*Nchips+chan])) 1827 return -EINVAL; 1828 } 1829 } 1830 1831 if (found) Nchips++; 1832 1833 return 0; 1834 } 1835 1836 if (cmd == SIOCSCCINI) 1837 { 1838 if (!capable(CAP_SYS_RAWIO)) 1839 return -EPERM; 1840 1841 if (Nchips == 0) 1842 return -EINVAL; 1843 1844 z8530_init(); 1845 return 0; 1846 } 1847 1848 return -EINVAL; /* confuse the user */ 1849 } 1850 1851 if (!scc->init) 1852 { 1853 if (cmd == SIOCSCCCHANINI) 1854 { 1855 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1856 if (!arg) return -EINVAL; 1857 1858 scc->stat.bufsize = SCC_BUFSIZE; 1859 1860 if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem))) 1861 return -EINVAL; 1862 1863 /* default KISS Params */ 1864 1865 if (scc->modem.speed < 4800) 1866 { 1867 scc->kiss.txdelay = 36; /* 360 ms */ 1868 scc->kiss.persist = 42; /* 25% persistence */ /* was 25 */ 1869 scc->kiss.slottime = 16; /* 160 ms */ 1870 scc->kiss.tailtime = 4; /* minimal reasonable value */ 1871 scc->kiss.fulldup = 0; /* CSMA */ 1872 scc->kiss.waittime = 50; /* 500 ms */ 1873 scc->kiss.maxkeyup = 10; /* 10 s */ 1874 scc->kiss.mintime = 3; /* 3 s */ 1875 scc->kiss.idletime = 30; /* 30 s */ 1876 scc->kiss.maxdefer = 120; /* 2 min */ 1877 scc->kiss.softdcd = 0; /* hardware dcd */ 1878 } else { 1879 scc->kiss.txdelay = 10; /* 100 ms */ 1880 scc->kiss.persist = 64; /* 25% persistence */ /* was 25 */ 1881 scc->kiss.slottime = 8; /* 160 ms */ 1882 scc->kiss.tailtime = 1; /* minimal reasonable value */ 1883 scc->kiss.fulldup = 0; /* CSMA */ 1884 scc->kiss.waittime = 50; /* 500 ms */ 1885 scc->kiss.maxkeyup = 7; /* 7 s */ 1886 scc->kiss.mintime = 3; /* 3 s */ 1887 scc->kiss.idletime = 30; /* 30 s */ 1888 scc->kiss.maxdefer = 120; /* 2 min */ 1889 scc->kiss.softdcd = 0; /* hardware dcd */ 1890 } 1891 1892 scc->tx_buff = NULL; 1893 skb_queue_head_init(&scc->tx_queue); 1894 scc->init = 1; 1895 1896 return 0; 1897 } 1898 1899 return -EINVAL; 1900 } 1901 1902 switch(cmd) 1903 { 1904 case SIOCSCCRESERVED: 1905 return -ENOIOCTLCMD; 1906 1907 case SIOCSCCSMEM: 1908 if (!capable(CAP_SYS_RAWIO)) return -EPERM; 1909 if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg))) 1910 return -EINVAL; 1911 scc->stat.bufsize = memcfg.bufsize; 1912 return 0; 1913 1914 case SIOCSCCGSTAT: 1915 if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat))) 1916 return -EINVAL; 1917 return 0; 1918 1919 case SIOCSCCGKISS: 1920 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd))) 1921 return -EINVAL; 1922 kiss_cmd.param = scc_get_param(scc, kiss_cmd.command); 1923 if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd))) 1924 return -EINVAL; 1925 return 0; 1926 1927 case SIOCSCCSKISS: 1928 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1929 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd))) 1930 return -EINVAL; 1931 return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param); 1932 1933 case SIOCSCCCAL: 1934 if (!capable(CAP_SYS_RAWIO)) return -EPERM; 1935 if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0) 1936 return -EINVAL; 1937 1938 scc_start_calibrate(scc, cal.time, cal.pattern); 1939 return 0; 1940 1941 default: 1942 return -ENOIOCTLCMD; 1943 1944 } 1945 1946 return -EINVAL; 1947} 1948 1949/* ----> set interface callsign <---- */ 1950 1951static int scc_net_set_mac_address(struct net_device *dev, void *addr) 1952{ 1953 struct sockaddr *sa = (struct sockaddr *) addr; 1954 dev_addr_set(dev, sa->sa_data); 1955 return 0; 1956} 1957 1958/* ----> get statistics <---- */ 1959 1960static struct net_device_stats *scc_net_get_stats(struct net_device *dev) 1961{ 1962 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv; 1963 1964 scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over; 1965 scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under; 1966 scc->dev_stat.rx_fifo_errors = scc->stat.rx_over; 1967 scc->dev_stat.tx_fifo_errors = scc->stat.tx_under; 1968 1969 return &scc->dev_stat; 1970} 1971 1972/* ******************************************************************** */ 1973/* * dump statistics to /proc/net/z8530drv * */ 1974/* ******************************************************************** */ 1975 1976#ifdef CONFIG_PROC_FS 1977 1978static inline struct scc_channel *scc_net_seq_idx(loff_t pos) 1979{ 1980 int k; 1981 1982 for (k = 0; k < Nchips*2; ++k) { 1983 if (!SCC_Info[k].init) 1984 continue; 1985 if (pos-- == 0) 1986 return &SCC_Info[k]; 1987 } 1988 return NULL; 1989} 1990 1991static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos) 1992{ 1993 return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN; 1994 1995} 1996 1997static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1998{ 1999 unsigned k; 2000 struct scc_channel *scc = v; 2001 ++*pos; 2002 2003 for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1; 2004 k < Nchips*2; ++k) { 2005 if (SCC_Info[k].init) 2006 return &SCC_Info[k]; 2007 } 2008 return NULL; 2009} 2010 2011static void scc_net_seq_stop(struct seq_file *seq, void *v) 2012{ 2013} 2014 2015static int scc_net_seq_show(struct seq_file *seq, void *v) 2016{ 2017 if (v == SEQ_START_TOKEN) { 2018 seq_puts(seq, "z8530drv-"VERSION"\n"); 2019 } else if (!Driver_Initialized) { 2020 seq_puts(seq, "not initialized\n"); 2021 } else if (!Nchips) { 2022 seq_puts(seq, "chips missing\n"); 2023 } else { 2024 const struct scc_channel *scc = v; 2025 const struct scc_stat *stat = &scc->stat; 2026 const struct scc_kiss *kiss = &scc->kiss; 2027 2028 2029 /* dev data ctrl irq clock brand enh vector special option 2030 * baud nrz clocksrc softdcd bufsize 2031 * rxints txints exints spints 2032 * rcvd rxerrs over / xmit txerrs under / nospace bufsize 2033 * txd pers slot tail ful wait min maxk idl defr txof grp 2034 * W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## 2035 * R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ## 2036 */ 2037 2038 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n", 2039 scc->dev->name, 2040 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand, 2041 scc->enhanced, Vector_Latch, scc->special, 2042 scc->option); 2043 seq_printf(seq, "\t%lu %d %d %d %d\n", 2044 scc->modem.speed, scc->modem.nrz, 2045 scc->modem.clocksrc, kiss->softdcd, 2046 stat->bufsize); 2047 seq_printf(seq, "\t%lu %lu %lu %lu\n", 2048 stat->rxints, stat->txints, stat->exints, stat->spints); 2049 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n", 2050 stat->rxframes, stat->rxerrs, stat->rx_over, 2051 stat->txframes, stat->txerrs, stat->tx_under, 2052 stat->nospace, stat->tx_state); 2053 2054#define K(x) kiss->x 2055 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n", 2056 K(txdelay), K(persist), K(slottime), K(tailtime), 2057 K(fulldup), K(waittime), K(mintime), K(maxkeyup), 2058 K(idletime), K(maxdefer), K(tx_inhibit), K(group)); 2059#undef K 2060#ifdef SCC_DEBUG 2061 { 2062 int reg; 2063 2064 seq_printf(seq, "\tW "); 2065 for (reg = 0; reg < 16; reg++) 2066 seq_printf(seq, "%2.2x ", scc->wreg[reg]); 2067 seq_printf(seq, "\n"); 2068 2069 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1)); 2070 for (reg = 3; reg < 8; reg++) 2071 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg)); 2072 seq_printf(seq, "XX "); 2073 for (reg = 9; reg < 16; reg++) 2074 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg)); 2075 seq_printf(seq, "\n"); 2076 } 2077#endif 2078 seq_putc(seq, '\n'); 2079 } 2080 2081 return 0; 2082} 2083 2084static const struct seq_operations scc_net_seq_ops = { 2085 .start = scc_net_seq_start, 2086 .next = scc_net_seq_next, 2087 .stop = scc_net_seq_stop, 2088 .show = scc_net_seq_show, 2089}; 2090#endif /* CONFIG_PROC_FS */ 2091 2092 2093/* ******************************************************************** */ 2094/* * Init SCC driver * */ 2095/* ******************************************************************** */ 2096 2097static int __init scc_init_driver (void) 2098{ 2099 char devname[IFNAMSIZ]; 2100 2101 printk(banner); 2102 2103 sprintf(devname,"%s0", SCC_DriverName); 2104 2105 rtnl_lock(); 2106 if (scc_net_alloc(devname, SCC_Info)) { 2107 rtnl_unlock(); 2108 printk(KERN_ERR "z8530drv: cannot initialize module\n"); 2109 return -EIO; 2110 } 2111 rtnl_unlock(); 2112 2113 proc_create_seq("z8530drv", 0, init_net.proc_net, &scc_net_seq_ops); 2114 2115 return 0; 2116} 2117 2118static void __exit scc_cleanup_driver(void) 2119{ 2120 io_port ctrl; 2121 int k; 2122 struct scc_channel *scc; 2123 struct net_device *dev; 2124 2125 if (Nchips == 0 && (dev = SCC_Info[0].dev)) 2126 { 2127 unregister_netdev(dev); 2128 free_netdev(dev); 2129 } 2130 2131 /* Guard against chip prattle */ 2132 local_irq_disable(); 2133 2134 for (k = 0; k < Nchips; k++) 2135 if ( (ctrl = SCC_ctrl[k].chan_A) ) 2136 { 2137 Outb(ctrl, 0); 2138 OutReg(ctrl,R9,FHWRES); /* force hardware reset */ 2139 udelay(50); 2140 } 2141 2142 /* To unload the port must be closed so no real IRQ pending */ 2143 for (k = 0; k < nr_irqs ; k++) 2144 if (Ivec[k].used) free_irq(k, NULL); 2145 2146 local_irq_enable(); 2147 2148 /* Now clean up */ 2149 for (k = 0; k < Nchips*2; k++) 2150 { 2151 scc = &SCC_Info[k]; 2152 if (scc->ctrl) 2153 { 2154 release_region(scc->ctrl, 1); 2155 release_region(scc->data, 1); 2156 } 2157 if (scc->dev) 2158 { 2159 unregister_netdev(scc->dev); 2160 free_netdev(scc->dev); 2161 } 2162 } 2163 2164 2165 if (Vector_Latch) 2166 release_region(Vector_Latch, 1); 2167 2168 remove_proc_entry("z8530drv", init_net.proc_net); 2169} 2170 2171MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>"); 2172MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards"); 2173MODULE_LICENSE("GPL"); 2174module_init(scc_init_driver); 2175module_exit(scc_cleanup_driver); 2176