| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 5828 | 87.45% | 81 | 60.00% |
| Adrian Bunk | 240 | 3.60% | 1 | 0.74% |
| Sudip Mukherjee | 192 | 2.88% | 1 | 0.74% |
| Stephen Hemminger | 114 | 1.71% | 4 | 2.96% |
| Ralf Baechle | 42 | 0.63% | 5 | 3.70% |
| David Howells | 33 | 0.50% | 2 | 1.48% |
| Al Viro | 23 | 0.35% | 3 | 2.22% |
| Randy Dunlap | 23 | 0.35% | 1 | 0.74% |
| Andrey Panin | 19 | 0.29% | 2 | 1.48% |
| Ingo Molnar | 18 | 0.27% | 1 | 0.74% |
| Eric W. Biedermann | 17 | 0.26% | 1 | 0.74% |
| Marcelo Feitoza Parisi | 13 | 0.20% | 2 | 1.48% |
| Linus Torvalds | 13 | 0.20% | 3 | 2.22% |
| Andrew Morton | 11 | 0.17% | 1 | 0.74% |
| Arnd Bergmann | 10 | 0.15% | 1 | 0.74% |
| Dave Jones | 7 | 0.11% | 2 | 1.48% |
| David S. Miller | 7 | 0.11% | 1 | 0.74% |
| Jakub Kiciński | 6 | 0.09% | 2 | 1.48% |
| Greg Kroah-Hartman | 6 | 0.09% | 1 | 0.74% |
| Rusty Russell | 5 | 0.08% | 1 | 0.74% |
| tangmeng | 4 | 0.06% | 1 | 0.74% |
| Arnaldo Carvalho de Melo | 4 | 0.06% | 1 | 0.74% |
| Patrick McHardy | 3 | 0.05% | 1 | 0.74% |
| Gustavo A. R. Silva | 3 | 0.05% | 2 | 1.48% |
| Florian Westphal | 3 | 0.05% | 1 | 0.74% |
| Paul Gortmaker | 2 | 0.03% | 1 | 0.74% |
| Jun Komuro | 2 | 0.03% | 1 | 0.74% |
| Justin Stitt | 2 | 0.03% | 1 | 0.74% |
| Jason A. Donenfeld | 2 | 0.03% | 1 | 0.74% |
| Thomas Gleixner | 2 | 0.03% | 1 | 0.74% |
| Thomas Sailer | 2 | 0.03% | 1 | 0.74% |
| Tom Gundersen | 2 | 0.03% | 1 | 0.74% |
| Jeremy Fitzhardinge | 1 | 0.02% | 1 | 0.74% |
| Nathan Chancellor | 1 | 0.02% | 1 | 0.74% |
| Christoph Hellwig | 1 | 0.02% | 1 | 0.74% |
| Hui Tang | 1 | 0.02% | 1 | 0.74% |
| Borislav Petkov | 1 | 0.02% | 1 | 0.74% |
| Michal Marek | 1 | 0.02% | 1 | 0.74% |
| Total | 6664 | 135 |
// SPDX-License-Identifier: GPL-2.0-or-later /*****************************************************************************/ /* * baycom_epp.c -- baycom epp radio modem driver. * * Copyright (C) 1998-2000 * Thomas Sailer (sailer@ife.ee.ethz.ch) * * Please note that the GPL allows you to use the driver, NOT the radio. * In order to use the radio, you need a license from the communications * authority of your country. * * History: * 0.1 xx.xx.1998 Initial version by Matthias Welwarsky (dg2fef) * 0.2 21.04.1998 Massive rework by Thomas Sailer * Integrated FPGA EPP modem configuration routines * 0.3 11.05.1998 Took FPGA config out and moved it into a separate program * 0.4 26.07.1999 Adapted to new lowlevel parport driver interface * 0.5 03.08.1999 adapt to Linus' new __setup/__initcall * removed some pre-2.2 kernel compatibility cruft * 0.6 10.08.1999 Check if parport can do SPP and is safe to access during interrupt contexts * 0.7 12.02.2000 adapted to softnet driver interface */ /*****************************************************************************/ #include <linux/crc-ccitt.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/string.h> #include <linux/workqueue.h> #include <linux/fs.h> #include <linux/parport.h> #include <linux/if_arp.h> #include <linux/hdlcdrv.h> #include <linux/baycom.h> #include <linux/jiffies.h> #include <linux/random.h> #include <net/ax25.h> #include <linux/uaccess.h> /* --------------------------------------------------------------------- */ #define BAYCOM_DEBUG #define BAYCOM_MAGIC 19730510 /* --------------------------------------------------------------------- */ static const char paranoia_str[] = KERN_ERR "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n"; static const char bc_drvname[] = "baycom_epp"; static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n" "baycom_epp: version 0.7\n"; /* --------------------------------------------------------------------- */ #define NR_PORTS 4 static struct net_device *baycom_device[NR_PORTS]; /* --------------------------------------------------------------------- */ /* EPP status register */ #define EPP_DCDBIT 0x80 #define EPP_PTTBIT 0x08 #define EPP_NREF 0x01 #define EPP_NRAEF 0x02 #define EPP_NRHF 0x04 #define EPP_NTHF 0x20 #define EPP_NTAEF 0x10 #define EPP_NTEF EPP_PTTBIT /* EPP control register */ #define EPP_TX_FIFO_ENABLE 0x10 #define EPP_RX_FIFO_ENABLE 0x08 #define EPP_MODEM_ENABLE 0x20 #define EPP_LEDS 0xC0 #define EPP_IRQ_ENABLE 0x10 /* LPT registers */ #define LPTREG_ECONTROL 0x402 #define LPTREG_CONFIGB 0x401 #define LPTREG_CONFIGA 0x400 #define LPTREG_EPPDATA 0x004 #define LPTREG_EPPADDR 0x003 #define LPTREG_CONTROL 0x002 #define LPTREG_STATUS 0x001 #define LPTREG_DATA 0x000 /* LPT control register */ #define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */ #define LPTCTRL_WRITE 0x01 #define LPTCTRL_ADDRSTB 0x08 #define LPTCTRL_DATASTB 0x02 #define LPTCTRL_INTEN 0x10 /* LPT status register */ #define LPTSTAT_SHIFT_NINTR 6 #define LPTSTAT_WAIT 0x80 #define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR) #define LPTSTAT_PE 0x20 #define LPTSTAT_DONE 0x10 #define LPTSTAT_NERROR 0x08 #define LPTSTAT_EPPTIMEOUT 0x01 /* LPT data register */ #define LPTDATA_SHIFT_TDI 0 #define LPTDATA_SHIFT_TMS 2 #define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI) #define LPTDATA_TCK 0x02 #define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS) #define LPTDATA_INITBIAS 0x80 /* EPP modem config/status bits */ #define EPP_DCDBIT 0x80 #define EPP_PTTBIT 0x08 #define EPP_RXEBIT 0x01 #define EPP_RXAEBIT 0x02 #define EPP_RXHFULL 0x04 #define EPP_NTHF 0x20 #define EPP_NTAEF 0x10 #define EPP_NTEF EPP_PTTBIT #define EPP_TX_FIFO_ENABLE 0x10 #define EPP_RX_FIFO_ENABLE 0x08 #define EPP_MODEM_ENABLE 0x20 #define EPP_LEDS 0xC0 #define EPP_IRQ_ENABLE 0x10 /* Xilinx 4k JTAG instructions */ #define XC4K_IRLENGTH 3 #define XC4K_EXTEST 0 #define XC4K_PRELOAD 1 #define XC4K_CONFIGURE 5 #define XC4K_BYPASS 7 #define EPP_CONVENTIONAL 0 #define EPP_FPGA 1 #define EPP_FPGAEXTSTATUS 2 #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8) /* ---------------------------------------------------------------------- */ /* * Information that need to be kept for each board. */ struct baycom_state { int magic; struct pardevice *pdev; struct net_device *dev; unsigned int work_running; struct delayed_work run_work; unsigned int modem; unsigned int bitrate; unsigned char stat; struct { unsigned int intclk; unsigned int fclk; unsigned int bps; unsigned int extmodem; unsigned int loopback; } cfg; struct hdlcdrv_channel_params ch_params; struct { unsigned int bitbuf, bitstream, numbits, state; unsigned char *bufptr; int bufcnt; unsigned char buf[TXBUFFER_SIZE]; } hdlcrx; struct { int calibrate; int slotcnt; int flags; enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state; unsigned char *bufptr; int bufcnt; unsigned char buf[TXBUFFER_SIZE]; } hdlctx; unsigned int ptt_keyed; struct sk_buff *skb; /* next transmit packet */ #ifdef BAYCOM_DEBUG struct debug_vals { unsigned long last_jiffies; unsigned cur_intcnt; unsigned last_intcnt; int cur_pllcorr; int last_pllcorr; unsigned int mod_cycles; unsigned int demod_cycles; } debug_vals; #endif /* BAYCOM_DEBUG */ }; /* --------------------------------------------------------------------- */ #define KISS_VERBOSE /* --------------------------------------------------------------------- */ #define PARAM_TXDELAY 1 #define PARAM_PERSIST 2 #define PARAM_SLOTTIME 3 #define PARAM_TXTAIL 4 #define PARAM_FULLDUP 5 #define PARAM_HARDWARE 6 #define PARAM_RETURN 255 /* --------------------------------------------------------------------- */ /* * the CRC routines are stolen from WAMPES * by Dieter Deyke */ /*---------------------------------------------------------------------------*/ #if 0 static inline void append_crc_ccitt(unsigned char *buffer, int len) { unsigned int crc = 0xffff; for (;len>0;len--) crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff]; crc ^= 0xffff; *buffer++ = crc; *buffer++ = crc >> 8; } #endif /*---------------------------------------------------------------------------*/ static inline int check_crc_ccitt(const unsigned char *buf, int cnt) { return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; } /*---------------------------------------------------------------------------*/ static inline int calc_crc_ccitt(const unsigned char *buf, int cnt) { return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff; } /* ---------------------------------------------------------------------- */ #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800) /* --------------------------------------------------------------------- */ static inline void baycom_int_freq(struct baycom_state *bc) { #ifdef BAYCOM_DEBUG unsigned long cur_jiffies = jiffies; /* * measure the interrupt frequency */ bc->debug_vals.cur_intcnt++; if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { bc->debug_vals.last_jiffies = cur_jiffies; bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; bc->debug_vals.cur_intcnt = 0; bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr; bc->debug_vals.cur_pllcorr = 0; } #endif /* BAYCOM_DEBUG */ } /* ---------------------------------------------------------------------- */ /* * eppconfig_path should be setable via /proc/sys. */ static char const eppconfig_path[] = "/usr/sbin/eppfpga"; static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL }; /* eppconfig: called during ifconfig up to configure the modem */ static int eppconfig(struct baycom_state *bc) { char modearg[256]; char portarg[16]; char *argv[] = { (char *)eppconfig_path, "-s", "-p", portarg, "-m", modearg, NULL }; /* set up arguments */ sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat", bc->cfg.intclk ? "int" : "ext", bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps, (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps), bc->cfg.loopback ? ",loopback" : ""); sprintf(portarg, "%ld", bc->pdev->port->base); printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg); return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC); } /* ---------------------------------------------------------------------- */ static inline void do_kiss_params(struct baycom_state *bc, unsigned char *data, unsigned long len) { #ifdef KISS_VERBOSE #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b) #else /* KISS_VERBOSE */ #define PKP(a,b) #endif /* KISS_VERBOSE */ if (len < 2) return; switch(data[0]) { case PARAM_TXDELAY: bc->ch_params.tx_delay = data[1]; PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay); break; case PARAM_PERSIST: bc->ch_params.ppersist = data[1]; PKP("p persistence = %u", bc->ch_params.ppersist); break; case PARAM_SLOTTIME: bc->ch_params.slottime = data[1]; PKP("slot time = %ums", bc->ch_params.slottime); break; case PARAM_TXTAIL: bc->ch_params.tx_tail = data[1]; PKP("TX tail = %ums", bc->ch_params.tx_tail); break; case PARAM_FULLDUP: bc->ch_params.fulldup = !!data[1]; PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half"); break; default: break; } #undef PKP } /* --------------------------------------------------------------------- */ static void encode_hdlc(struct baycom_state *bc) { struct sk_buff *skb; unsigned char *wp, *bp; int pkt_len; unsigned bitstream, notbitstream, bitbuf, numbit, crc; unsigned char crcarr[2]; int j; if (bc->hdlctx.bufcnt > 0) return; skb = bc->skb; if (!skb) return; bc->skb = NULL; pkt_len = skb->len-1; /* strip KISS byte */ wp = bc->hdlctx.buf; bp = skb->data+1; crc = calc_crc_ccitt(bp, pkt_len); crcarr[0] = crc; crcarr[1] = crc >> 8; *wp++ = 0x7e; bitstream = bitbuf = numbit = 0; while (pkt_len > -2) { bitstream >>= 8; bitstream |= ((unsigned int)*bp) << 8; bitbuf |= ((unsigned int)*bp) << numbit; notbitstream = ~bitstream; bp++; pkt_len--; if (!pkt_len) bp = crcarr; for (j = 0; j < 8; j++) if (unlikely(!(notbitstream & (0x1f0 << j)))) { bitstream &= ~(0x100 << j); bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); numbit++; notbitstream = ~bitstream; } numbit += 8; while (numbit >= 8) { *wp++ = bitbuf; bitbuf >>= 8; numbit -= 8; } } bitbuf |= 0x7e7e << numbit; numbit += 16; while (numbit >= 8) { *wp++ = bitbuf; bitbuf >>= 8; numbit -= 8; } bc->hdlctx.bufptr = bc->hdlctx.buf; bc->hdlctx.bufcnt = wp - bc->hdlctx.buf; dev_kfree_skb(skb); bc->dev->stats.tx_packets++; } /* ---------------------------------------------------------------------- */ static int transmit(struct baycom_state *bc, int cnt, unsigned char stat) { struct parport *pp = bc->pdev->port; unsigned char tmp[128]; int i, j; if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT)) bc->hdlctx.state = tx_idle; if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) { if (bc->hdlctx.bufcnt <= 0) encode_hdlc(bc); if (bc->hdlctx.bufcnt <= 0) return 0; if (!bc->ch_params.fulldup) { if (!(stat & EPP_DCDBIT)) { bc->hdlctx.slotcnt = bc->ch_params.slottime; return 0; } if ((--bc->hdlctx.slotcnt) > 0) return 0; bc->hdlctx.slotcnt = bc->ch_params.slottime; if (get_random_u8() > bc->ch_params.ppersist) return 0; } } if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) { bc->hdlctx.state = tx_keyup; bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay); bc->ptt_keyed++; } while (cnt > 0) { switch (bc->hdlctx.state) { case tx_keyup: i = min_t(int, cnt, bc->hdlctx.flags); cnt -= i; bc->hdlctx.flags -= i; if (bc->hdlctx.flags <= 0) bc->hdlctx.state = tx_data; memset(tmp, 0x7e, sizeof(tmp)); while (i > 0) { j = (i > sizeof(tmp)) ? sizeof(tmp) : i; if (j != pp->ops->epp_write_data(pp, tmp, j, 0)) return -1; i -= j; } break; case tx_data: if (bc->hdlctx.bufcnt <= 0) { encode_hdlc(bc); if (bc->hdlctx.bufcnt <= 0) { bc->hdlctx.state = tx_tail; bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail); break; } } i = min_t(int, cnt, bc->hdlctx.bufcnt); bc->hdlctx.bufcnt -= i; cnt -= i; if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0)) return -1; bc->hdlctx.bufptr += i; break; case tx_tail: encode_hdlc(bc); if (bc->hdlctx.bufcnt > 0) { bc->hdlctx.state = tx_data; break; } i = min_t(int, cnt, bc->hdlctx.flags); if (i) { cnt -= i; bc->hdlctx.flags -= i; memset(tmp, 0x7e, sizeof(tmp)); while (i > 0) { j = (i > sizeof(tmp)) ? sizeof(tmp) : i; if (j != pp->ops->epp_write_data(pp, tmp, j, 0)) return -1; i -= j; } break; } fallthrough; default: if (bc->hdlctx.calibrate <= 0) return 0; i = min_t(int, cnt, bc->hdlctx.calibrate); cnt -= i; bc->hdlctx.calibrate -= i; memset(tmp, 0, sizeof(tmp)); while (i > 0) { j = (i > sizeof(tmp)) ? sizeof(tmp) : i; if (j != pp->ops->epp_write_data(pp, tmp, j, 0)) return -1; i -= j; } break; } } return 0; } /* ---------------------------------------------------------------------- */ static void do_rxpacket(struct net_device *dev) { struct baycom_state *bc = netdev_priv(dev); struct sk_buff *skb; unsigned char *cp; unsigned pktlen; if (bc->hdlcrx.bufcnt < 4) return; if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt)) return; pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */ if (!(skb = dev_alloc_skb(pktlen))) { printk("%s: memory squeeze, dropping packet\n", dev->name); dev->stats.rx_dropped++; return; } cp = skb_put(skb, pktlen); *cp++ = 0; /* KISS kludge */ memcpy(cp, bc->hdlcrx.buf, pktlen - 1); skb->protocol = ax25_type_trans(skb, dev); netif_rx(skb); dev->stats.rx_packets++; } static int receive(struct net_device *dev, int cnt) { struct baycom_state *bc = netdev_priv(dev); struct parport *pp = bc->pdev->port; unsigned int bitbuf, notbitstream, bitstream, numbits, state; unsigned char tmp[128]; unsigned char *cp; int cnt2, ret = 0; int j; numbits = bc->hdlcrx.numbits; state = bc->hdlcrx.state; bitstream = bc->hdlcrx.bitstream; bitbuf = bc->hdlcrx.bitbuf; while (cnt > 0) { cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt; cnt -= cnt2; if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) { ret = -1; break; } cp = tmp; for (; cnt2 > 0; cnt2--, cp++) { bitstream >>= 8; bitstream |= (*cp) << 8; bitbuf >>= 8; bitbuf |= (*cp) << 8; numbits += 8; notbitstream = ~bitstream; for (j = 0; j < 8; j++) { /* flag or abort */ if (unlikely(!(notbitstream & (0x0fc << j)))) { /* abort received */ if (!(notbitstream & (0x1fc << j))) state = 0; /* flag received */ else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) { if (state) do_rxpacket(dev); bc->hdlcrx.bufcnt = 0; bc->hdlcrx.bufptr = bc->hdlcrx.buf; state = 1; numbits = 7-j; } } /* stuffed bit */ else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) { numbits--; bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); } } while (state && numbits >= 8) { if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) { state = 0; } else { *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits); bc->hdlcrx.bufcnt++; numbits -= 8; } } } } bc->hdlcrx.numbits = numbits; bc->hdlcrx.state = state; bc->hdlcrx.bitstream = bitstream; bc->hdlcrx.bitbuf = bitbuf; return ret; } /* --------------------------------------------------------------------- */ #define GETTICK(x) \ ({ \ x = (unsigned int)get_cycles(); \ }) static void epp_bh(struct work_struct *work) { struct net_device *dev; struct baycom_state *bc; struct parport *pp; unsigned char stat; unsigned char tmp[2]; unsigned int time1 = 0, time2 = 0, time3 = 0; int cnt, cnt2; bc = container_of(work, struct baycom_state, run_work.work); dev = bc->dev; if (!bc->work_running) return; baycom_int_freq(bc); pp = bc->pdev->port; /* update status */ if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) goto epptimeout; bc->stat = stat; bc->debug_vals.last_pllcorr = stat; GETTICK(time1); if (bc->modem == EPP_FPGAEXTSTATUS) { /* get input count */ tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1; if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1) goto epptimeout; if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2) goto epptimeout; cnt = tmp[0] | (tmp[1] << 8); cnt &= 0x7fff; /* get output count */ tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2; if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1) goto epptimeout; if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2) goto epptimeout; cnt2 = tmp[0] | (tmp[1] << 8); cnt2 = 16384 - (cnt2 & 0x7fff); /* return to normal */ tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE; if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1) goto epptimeout; if (transmit(bc, cnt2, stat)) goto epptimeout; GETTICK(time2); if (receive(dev, cnt)) goto epptimeout; if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) goto epptimeout; bc->stat = stat; } else { /* try to tx */ switch (stat & (EPP_NTAEF|EPP_NTHF)) { case EPP_NTHF: cnt = 2048 - 256; break; case EPP_NTAEF: cnt = 2048 - 1793; break; case 0: cnt = 0; break; default: cnt = 2048 - 1025; break; } if (transmit(bc, cnt, stat)) goto epptimeout; GETTICK(time2); /* do receiver */ while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) { switch (stat & (EPP_NRAEF|EPP_NRHF)) { case EPP_NRAEF: cnt = 1025; break; case 0: cnt = 1793; break; default: cnt = 256; break; } if (receive(dev, cnt)) goto epptimeout; if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) goto epptimeout; } cnt = 0; if (bc->bitrate < 50000) cnt = 256; else if (bc->bitrate < 100000) cnt = 128; while (cnt > 0 && stat & EPP_NREF) { if (receive(dev, 1)) goto epptimeout; cnt--; if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) goto epptimeout; } } GETTICK(time3); #ifdef BAYCOM_DEBUG bc->debug_vals.mod_cycles = time2 - time1; bc->debug_vals.demod_cycles = time3 - time2; #endif /* BAYCOM_DEBUG */ schedule_delayed_work(&bc->run_work, 1); if (!bc->skb) netif_wake_queue(dev); return; epptimeout: printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname); } /* ---------------------------------------------------------------------- */ /* * ===================== network driver interface ========================= */ static netdev_tx_t baycom_send_packet(struct sk_buff *skb, struct net_device *dev) { struct baycom_state *bc = netdev_priv(dev); if (skb->protocol == htons(ETH_P_IP)) return ax25_ip_xmit(skb); if (skb->data[0] != 0) { do_kiss_params(bc, skb->data, skb->len); dev_kfree_skb(skb); return NETDEV_TX_OK; } if (bc->skb) { dev_kfree_skb(skb); return NETDEV_TX_OK; } /* strip KISS byte */ if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) { dev_kfree_skb(skb); return NETDEV_TX_OK; } netif_stop_queue(dev); bc->skb = skb; return NETDEV_TX_OK; } /* --------------------------------------------------------------------- */ static int baycom_set_mac_address(struct net_device *dev, void *addr) { struct sockaddr *sa = (struct sockaddr *)addr; /* addr is an AX.25 shifted ASCII mac address */ dev_addr_set(dev, sa->sa_data); return 0; } /* --------------------------------------------------------------------- */ static void epp_wakeup(void *handle) { struct net_device *dev = (struct net_device *)handle; struct baycom_state *bc = netdev_priv(dev); printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name); if (!parport_claim(bc->pdev)) printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name); } /* --------------------------------------------------------------------- */ /* * Open/initialize the board. This is called (in the current kernel) * sometime after booting when the 'ifconfig' program is run. * * This routine should set everything up anew at each open, even * registers that "should" only need to be set once at boot, so that * there is non-reboot way to recover if something goes wrong. */ static int epp_open(struct net_device *dev) { struct baycom_state *bc = netdev_priv(dev); struct parport *pp = parport_find_base(dev->base_addr); unsigned int i, j; unsigned char tmp[128]; unsigned char stat; unsigned long tstart; struct pardev_cb par_cb; if (!pp) { printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr); return -ENXIO; } #if 0 if (pp->irq < 0) { printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base); parport_put_port(pp); return -ENXIO; } #endif if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) { printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n", bc_drvname, pp->base); parport_put_port(pp); return -EIO; } memset(&bc->modem, 0, sizeof(bc->modem)); memset(&par_cb, 0, sizeof(par_cb)); par_cb.wakeup = epp_wakeup; par_cb.private = (void *)dev; par_cb.flags = PARPORT_DEV_EXCL; for (i = 0; i < NR_PORTS; i++) if (baycom_device[i] == dev) break; if (i == NR_PORTS) { pr_err("%s: no device found\n", bc_drvname); parport_put_port(pp); return -ENODEV; } bc->pdev = parport_register_dev_model(pp, dev->name, &par_cb, i); parport_put_port(pp); if (!bc->pdev) { printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base); return -ENXIO; } if (parport_claim(bc->pdev)) { printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base); parport_unregister_device(bc->pdev); return -EBUSY; } dev->irq = /*pp->irq*/ 0; INIT_DELAYED_WORK(&bc->run_work, epp_bh); bc->work_running = 1; bc->modem = EPP_CONVENTIONAL; if (eppconfig(bc)) printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname); else bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS; parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */ /* reset the modem */ tmp[0] = 0; tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE; if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2) goto epptimeout; /* autoprobe baud rate */ tstart = jiffies; i = 0; while (time_before(jiffies, tstart + HZ/3)) { if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) goto epptimeout; if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) { schedule(); continue; } if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128) goto epptimeout; if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128) goto epptimeout; i += 256; } for (j = 0; j < 256; j++) { if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) goto epptimeout; if (!(stat & EPP_NREF)) break; if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1) goto epptimeout; i++; } tstart = jiffies - tstart; bc->bitrate = i * (8 * HZ) / tstart; j = 1; i = bc->bitrate >> 3; while (j < 7 && i > 150) { j++; i >>= 1; } printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n", bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2)); tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/; if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1) goto epptimeout; /* * initialise hdlc variables */ bc->hdlcrx.state = 0; bc->hdlcrx.numbits = 0; bc->hdlctx.state = tx_idle; bc->hdlctx.bufcnt = 0; bc->hdlctx.slotcnt = bc->ch_params.slottime; bc->hdlctx.calibrate = 0; /* start the bottom half stuff */ schedule_delayed_work(&bc->run_work, 1); netif_start_queue(dev); return 0; epptimeout: printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname); parport_write_control(pp, 0); /* reset the adapter */ parport_release(bc->pdev); parport_unregister_device(bc->pdev); return -EIO; } /* --------------------------------------------------------------------- */ static int epp_close(struct net_device *dev) { struct baycom_state *bc = netdev_priv(dev); struct parport *pp = bc->pdev->port; unsigned char tmp[1]; bc->work_running = 0; cancel_delayed_work_sync(&bc->run_work); bc->stat = EPP_DCDBIT; tmp[0] = 0; pp->ops->epp_write_addr(pp, tmp, 1, 0); parport_write_control(pp, 0); /* reset the adapter */ parport_release(bc->pdev); parport_unregister_device(bc->pdev); dev_kfree_skb(bc->skb); bc->skb = NULL; printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n", bc_drvname, dev->base_addr, dev->irq); return 0; } /* --------------------------------------------------------------------- */ static int baycom_setmode(struct baycom_state *bc, const char *modestr) { const char *cp; if (strstr(modestr,"intclk")) bc->cfg.intclk = 1; if (strstr(modestr,"extclk")) bc->cfg.intclk = 0; if (strstr(modestr,"intmodem")) bc->cfg.extmodem = 0; if (strstr(modestr,"extmodem")) bc->cfg.extmodem = 1; if (strstr(modestr,"loopback")) bc->cfg.loopback = 1; if (strstr(modestr, "noloopback")) bc->cfg.loopback = 0; if ((cp = strstr(modestr,"fclk="))) { bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0); if (bc->cfg.fclk < 1000000) bc->cfg.fclk = 1000000; if (bc->cfg.fclk > 25000000) bc->cfg.fclk = 25000000; } if ((cp = strstr(modestr,"bps="))) { bc->cfg.bps = simple_strtoul(cp+4, NULL, 0); if (bc->cfg.bps < 1000) bc->cfg.bps = 1000; if (bc->cfg.bps > 1500000) bc->cfg.bps = 1500000; } return 0; } /* --------------------------------------------------------------------- */ static int baycom_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd) { struct baycom_state *bc = netdev_priv(dev); struct hdlcdrv_ioctl hi; if (cmd != SIOCDEVPRIVATE) return -ENOIOCTLCMD; if (copy_from_user(&hi, data, sizeof(hi))) return -EFAULT; switch (hi.cmd) { default: return -ENOIOCTLCMD; case HDLCDRVCTL_GETCHANNELPAR: hi.data.cp.tx_delay = bc->ch_params.tx_delay; hi.data.cp.tx_tail = bc->ch_params.tx_tail; hi.data.cp.slottime = bc->ch_params.slottime; hi.data.cp.ppersist = bc->ch_params.ppersist; hi.data.cp.fulldup = bc->ch_params.fulldup; break; case HDLCDRVCTL_SETCHANNELPAR: if (!capable(CAP_NET_ADMIN)) return -EACCES; bc->ch_params.tx_delay = hi.data.cp.tx_delay; bc->ch_params.tx_tail = hi.data.cp.tx_tail; bc->ch_params.slottime = hi.data.cp.slottime; bc->ch_params.ppersist = hi.data.cp.ppersist; bc->ch_params.fulldup = hi.data.cp.fulldup; bc->hdlctx.slotcnt = 1; return 0; case HDLCDRVCTL_GETMODEMPAR: hi.data.mp.iobase = dev->base_addr; hi.data.mp.irq = dev->irq; hi.data.mp.dma = dev->dma; hi.data.mp.dma2 = 0; hi.data.mp.seriobase = 0; hi.data.mp.pariobase = 0; hi.data.mp.midiiobase = 0; break; case HDLCDRVCTL_SETMODEMPAR: if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) return -EACCES; dev->base_addr = hi.data.mp.iobase; dev->irq = /*hi.data.mp.irq*/0; dev->dma = /*hi.data.mp.dma*/0; return 0; case HDLCDRVCTL_GETSTAT: hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT); hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT); hi.data.cs.ptt_keyed = bc->ptt_keyed; hi.data.cs.tx_packets = dev->stats.tx_packets; hi.data.cs.tx_errors = dev->stats.tx_errors; hi.data.cs.rx_packets = dev->stats.rx_packets; hi.data.cs.rx_errors = dev->stats.rx_errors; break; case HDLCDRVCTL_OLDGETSTAT: hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT); hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT); hi.data.ocs.ptt_keyed = bc->ptt_keyed; break; case HDLCDRVCTL_CALIBRATE: if (!capable(CAP_SYS_RAWIO)) return -EACCES; bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8; return 0; case HDLCDRVCTL_DRIVERNAME: strscpy_pad(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername)); break; case HDLCDRVCTL_GETMODE: sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s", bc->cfg.intclk ? "int" : "ext", bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps, bc->cfg.loopback ? ",loopback" : ""); break; case HDLCDRVCTL_SETMODE: if (!capable(CAP_NET_ADMIN) || netif_running(dev)) return -EACCES; hi.data.modename[sizeof(hi.data.modename)-1] = '\0'; return baycom_setmode(bc, hi.data.modename); case HDLCDRVCTL_MODELIST: strscpy_pad(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x", sizeof(hi.data.modename)); break; case HDLCDRVCTL_MODEMPARMASK: return HDLCDRV_PARMASK_IOBASE; } if (copy_to_user(data, &hi, sizeof(hi))) return -EFAULT; return 0; } /* --------------------------------------------------------------------- */ static const struct net_device_ops baycom_netdev_ops = { .ndo_open = epp_open, .ndo_stop = epp_close, .ndo_siocdevprivate = baycom_siocdevprivate, .ndo_start_xmit = baycom_send_packet, .ndo_set_mac_address = baycom_set_mac_address, }; /* * Check for a network adaptor of this type, and return '0' if one exists. * If dev->base_addr == 0, probe all likely locations. * If dev->base_addr == 1, always return failure. * If dev->base_addr == 2, allocate space for the device and return success * (detachable devices only). */ static void baycom_probe(struct net_device *dev) { const struct hdlcdrv_channel_params dflt_ch_params = { 20, 2, 10, 40, 0 }; struct baycom_state *bc; /* * not a real probe! only initialize data structures */ bc = netdev_priv(dev); /* * initialize the baycom_state struct */ bc->ch_params = dflt_ch_params; bc->ptt_keyed = 0; /* * initialize the device struct */ /* Fill in the fields of the device structure */ bc->skb = NULL; dev->netdev_ops = &baycom_netdev_ops; dev->header_ops = &ax25_header_ops; dev->type = ARPHRD_AX25; /* AF_AX25 device */ dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); dev_addr_set(dev, (u8 *)&null_ax25_address); dev->tx_queue_len = 16; /* New style flags */ dev->flags = 0; } /* --------------------------------------------------------------------- */ /* * command line settable parameters */ static char *mode[NR_PORTS] = { "", }; static int iobase[NR_PORTS] = { 0x378, }; module_param_array(mode, charp, NULL, 0); MODULE_PARM_DESC(mode, "baycom operating mode"); module_param_hw_array(iobase, int, ioport, NULL, 0); MODULE_PARM_DESC(iobase, "baycom io base address"); MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); MODULE_DESCRIPTION("Baycom epp amateur radio modem driver"); MODULE_LICENSE("GPL"); /* --------------------------------------------------------------------- */ static int baycom_epp_par_probe(struct pardevice *par_dev) { struct device_driver *drv = par_dev->dev.driver; int len = strlen(drv->name); if (strncmp(par_dev->name, drv->name, len)) return -ENODEV; return 0; } static struct parport_driver baycom_epp_par_driver = { .name = "bce", .probe = baycom_epp_par_probe, .devmodel = true, }; static void __init baycom_epp_dev_setup(struct net_device *dev) { struct baycom_state *bc = netdev_priv(dev); /* * initialize part of the baycom_state struct */ bc->dev = dev; bc->magic = BAYCOM_MAGIC; bc->cfg.fclk = 19666600; bc->cfg.bps = 9600; /* * initialize part of the device struct */ baycom_probe(dev); } static int __init init_baycomepp(void) { int i, found = 0, ret; char set_hw = 1; printk(bc_drvinfo); ret = parport_register_driver(&baycom_epp_par_driver); if (ret) return ret; /* * register net devices */ for (i = 0; i < NR_PORTS; i++) { struct net_device *dev; dev = alloc_netdev(sizeof(struct baycom_state), "bce%d", NET_NAME_UNKNOWN, baycom_epp_dev_setup); if (!dev) { printk(KERN_WARNING "bce%d : out of memory\n", i); return found ? 0 : -ENOMEM; } sprintf(dev->name, "bce%d", i); dev->base_addr = iobase[i]; if (!mode[i]) set_hw = 0; if (!set_hw) iobase[i] = 0; if (register_netdev(dev)) { printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name); free_netdev(dev); break; } if (set_hw && baycom_setmode(netdev_priv(dev), mode[i])) set_hw = 0; baycom_device[i] = dev; found++; } if (found == 0) { parport_unregister_driver(&baycom_epp_par_driver); return -ENXIO; } return 0; } static void __exit cleanup_baycomepp(void) { int i; for(i = 0; i < NR_PORTS; i++) { struct net_device *dev = baycom_device[i]; if (dev) { struct baycom_state *bc = netdev_priv(dev); if (bc->magic == BAYCOM_MAGIC) { unregister_netdev(dev); free_netdev(dev); } else printk(paranoia_str, "cleanup_module"); } } parport_unregister_driver(&baycom_epp_par_driver); } module_init(init_baycomepp); module_exit(cleanup_baycomepp); /* --------------------------------------------------------------------- */ #ifndef MODULE /* * format: baycom_epp=io,mode * mode: fpga config options */ static int __init baycom_epp_setup(char *str) { static unsigned __initdata nr_dev = 0; int ints[2]; if (nr_dev >= NR_PORTS) return 0; str = get_options(str, 2, ints); if (ints[0] < 1) return 0; mode[nr_dev] = str; iobase[nr_dev] = ints[1]; nr_dev++; return 1; } __setup("baycom_epp=", baycom_epp_setup); #endif /* MODULE */ /* --------------------------------------------------------------------- */
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