/*****************************************************************************/ /* * baycom_epp.c -- baycom epp radio modem driver. * * Copyright (C) 1998-2000 * Thomas Sailer (sailer@ife.ee.ethz.ch) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) /* prototypes for ax25_encapsulate and ax25_rebuild_header */ #include #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */ #define __KERNEL_SYSCALLS__ #include /* --------------------------------------------------------------------- */ #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"; #define baycom_paranoia_check(dev,routine,retval) \ ({ \ if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \ printk(paranoia_str, routine); \ return retval; \ } \ }) #define baycom_paranoia_check_void(dev,routine) \ ({ \ if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \ printk(paranoia_str, routine); \ return; \ } \ }) /* --------------------------------------------------------------------- */ static const char bc_drvname[] = "baycom_epp"; static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n" KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\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< (b)) ? (a) : (b)) /* --------------------------------------------------------------------- */ #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 */ static const unsigned short crc_ccitt_table[] = { 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 }; /*---------------------------------------------------------------------------*/ #if 0 extern 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 /*---------------------------------------------------------------------------*/ extern inline int check_crc_ccitt(const unsigned char *buf, int cnt) { unsigned int crc = 0xffff; for (; cnt > 0; cnt--) crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; return (crc & 0xffff) == 0xf0b8; } /*---------------------------------------------------------------------------*/ extern inline int calc_crc_ccitt(const unsigned char *buf, int cnt) { unsigned int crc = 0xffff; for (; cnt > 0; cnt--) crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; crc ^= 0xffff; return (crc & 0xffff); } /* ---------------------------------------------------------------------- */ #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800) /* --------------------------------------------------------------------- */ static void inline 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 ((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 eppconfig_path[256] = "/usr/sbin/eppfpga"; static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL }; static int errno; static int exec_eppfpga(void *b) { struct baycom_state *bc = (struct baycom_state *)b; char modearg[256]; char portarg[16]; char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg, NULL}; int i; /* 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); i = exec_usermodehelper(eppconfig_path, argv, envp); if (i < 0) { printk(KERN_ERR "%s: failed to exec %s -s -p %s -m %s, errno = %d\n", bc_drvname, eppconfig_path, portarg, modearg, i); return i; } return 0; } /* eppconfig: called during ifconfig up to configure the modem */ static int eppconfig(struct baycom_state *bc) { int i, pid, r; mm_segment_t fs; pid = kernel_thread(exec_eppfpga, bc, CLONE_FS); if (pid < 0) { printk(KERN_ERR "%s: fork failed, errno %d\n", bc_drvname, -pid); return pid; } fs = get_fs(); set_fs(KERNEL_DS); /* Allow i to be in kernel space. */ r = waitpid(pid, &i, __WCLONE); set_fs(fs); if (r != pid) { printk(KERN_ERR "%s: waitpid(%d) failed, returning %d\n", bc_drvname, pid, r); return -1; } printk(KERN_DEBUG "%s: eppfpga returned %d\n", bc_drvname, i); return i; } /* ---------------------------------------------------------------------- */ static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs) { } /* ---------------------------------------------------------------------- */ static void inline 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 } /* --------------------------------------------------------------------- */ /* * high performance HDLC encoder * yes, it's ugly, but generates pretty good code */ #define ENCODEITERA(j) \ ({ \ if (!(notbitstream & (0x1f0 << j))) \ goto stuff##j; \ encodeend##j: \ }) #define ENCODEITERB(j) \ ({ \ stuff##j: \ bitstream &= ~(0x100 << j); \ bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | \ ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); \ numbit++; \ notbitstream = ~bitstream; \ goto encodeend##j; \ }) 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]; 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; ENCODEITERA(0); ENCODEITERA(1); ENCODEITERA(2); ENCODEITERA(3); ENCODEITERA(4); ENCODEITERA(5); ENCODEITERA(6); ENCODEITERA(7); goto enditer; ENCODEITERB(0); ENCODEITERB(1); ENCODEITERB(2); ENCODEITERB(3); ENCODEITERB(4); ENCODEITERB(5); ENCODEITERB(6); ENCODEITERB(7); enditer: 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->stats.tx_packets++; } /* ---------------------------------------------------------------------- */ static unsigned short random_seed; static inline unsigned short random_num(void) { random_seed = 28629 * random_seed + 157; return random_seed; } /* ---------------------------------------------------------------------- */ 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 ((random_num() % 256) > 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(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(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(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; } default: /* fall through */ if (bc->hdlctx.calibrate <= 0) return 0; i = min(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 = (struct baycom_state *)dev->priv; 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); bc->stats.rx_dropped++; return; } skb->dev = dev; cp = skb_put(skb, pktlen); *cp++ = 0; /* KISS kludge */ memcpy(cp, bc->hdlcrx.buf, pktlen - 1); skb->protocol = htons(ETH_P_AX25); skb->mac.raw = skb->data; netif_rx(skb); bc->stats.rx_packets++; } #define DECODEITERA(j) \ ({ \ if (!(notbitstream & (0x0fc << j))) /* flag or abort */ \ goto flgabrt##j; \ if ((bitstream & (0x1f8 << j)) == (0xf8 << j)) /* stuffed bit */ \ goto stuff##j; \ enditer##j: \ }) #define DECODEITERB(j) \ ({ \ flgabrt##j: \ if (!(notbitstream & (0x1fc << j))) { /* abort received */ \ state = 0; \ goto enditer##j; \ } \ if ((bitstream & (0x1fe << j)) != (0x0fc << j)) /* flag received */ \ goto enditer##j; \ if (state) \ do_rxpacket(dev); \ bc->hdlcrx.bufcnt = 0; \ bc->hdlcrx.bufptr = bc->hdlcrx.buf; \ state = 1; \ numbits = 7-j; \ goto enditer##j; \ stuff##j: \ numbits--; \ bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); \ goto enditer##j; \ }) static int receive(struct net_device *dev, int cnt) { struct baycom_state *bc = (struct baycom_state *)dev->priv; struct parport *pp = bc->pdev->port; unsigned int bitbuf, notbitstream, bitstream, numbits, state; unsigned char tmp[128]; unsigned char *cp; int cnt2, ret = 0; 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; DECODEITERA(0); DECODEITERA(1); DECODEITERA(2); DECODEITERA(3); DECODEITERA(4); DECODEITERA(5); DECODEITERA(6); DECODEITERA(7); goto enddec; DECODEITERB(0); DECODEITERB(1); DECODEITERB(2); DECODEITERB(3); DECODEITERB(4); DECODEITERB(5); DECODEITERB(6); DECODEITERB(7); enddec: 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; } /* --------------------------------------------------------------------- */ #ifdef __i386__ #define GETTICK(x) \ ({ \ if (cpu_has_tsc) \ __asm__ __volatile__("rdtsc" : "=a" (x) : : "dx");\ }) #else /* __i386__ */ #define GETTICK(x) #endif /* __i386__ */ static void epp_bh(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; baycom_paranoia_check_void(dev, "epp_bh"); bc = (struct baycom_state *)dev->priv; if (!bc->bh_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 */ queue_task(&bc->run_bh, &tq_timer); if (!bc->skb) netif_wake_queue(dev); return; epptimeout: printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname); } /* ---------------------------------------------------------------------- */ /* * ===================== network driver interface ========================= */ static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev) { struct baycom_state *bc; baycom_paranoia_check(dev, "baycom_send_packet", 0); bc = (struct baycom_state *)dev->priv; if (skb->data[0] != 0) { do_kiss_params(bc, skb->data, skb->len); dev_kfree_skb(skb); return 0; } if (bc->skb) return -1; /* strip KISS byte */ if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) { dev_kfree_skb(skb); return 0; } netif_stop_queue(dev); bc->skb = skb; return 0; } /* --------------------------------------------------------------------- */ 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 */ memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); return 0; } /* --------------------------------------------------------------------- */ static struct net_device_stats *baycom_get_stats(struct net_device *dev) { struct baycom_state *bc; baycom_paranoia_check(dev, "baycom_get_stats", NULL); bc = (struct baycom_state *)dev->priv; /* * Get the current statistics. This may be called with the * card open or closed. */ return &bc->stats; } /* --------------------------------------------------------------------- */ static void epp_wakeup(void *handle) { struct net_device *dev = (struct net_device *)handle; struct baycom_state *bc; baycom_paranoia_check_void(dev, "epp_wakeup"); bc = (struct baycom_state *)dev->priv; 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; struct parport *pp; const struct tq_struct run_bh = { routine: (void *)(void *)epp_bh, data: dev }; unsigned int i, j; unsigned char tmp[128]; unsigned char stat; unsigned long tstart; baycom_paranoia_check(dev, "epp_open", -ENXIO); bc = (struct baycom_state *)dev->priv; pp = parport_enumerate(); while (pp && pp->base != dev->base_addr) pp = pp->next; 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); 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); return -EIO; } memset(&bc->modem, 0, sizeof(bc->modem)); if (!(bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup, epp_interrupt, PARPORT_DEV_EXCL, dev))) { 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; bc->run_bh = run_bh; bc->bh_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 ((signed)(jiffies-tstart-HZ/3) < 0) { 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 */ queue_task(&bc->run_bh, &tq_timer); netif_start_queue(dev); MOD_INC_USE_COUNT; 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; struct parport *pp; unsigned char tmp[1]; baycom_paranoia_check(dev, "epp_close", -EINVAL); bc = (struct baycom_state *)dev->priv; pp = bc->pdev->port; bc->bh_running = 0; run_task_queue(&tq_timer); /* dequeue bottom half */ 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); if (bc->skb) 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); MOD_DEC_USE_COUNT; 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,"noloopback")) bc->cfg.loopback = 0; if (strstr(modestr,"loopback")) bc->cfg.loopback = 1; 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_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { struct baycom_state *bc; struct baycom_ioctl bi; struct hdlcdrv_ioctl hi; struct sm_ioctl si; baycom_paranoia_check(dev, "baycom_ioctl", -EINVAL); bc = (struct baycom_state *)dev->priv; if (cmd != SIOCDEVPRIVATE) return -ENOIOCTLCMD; if (get_user(cmd, (int *)ifr->ifr_data)) return -EFAULT; #ifdef BAYCOM_DEBUG if (cmd == BAYCOMCTL_GETDEBUG) { bi.data.dbg.debug1 = bc->ptt_keyed; bi.data.dbg.debug2 = bc->debug_vals.last_intcnt; bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr; bc->debug_vals.last_intcnt = 0; if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) return -EFAULT; return 0; } if (cmd == SMCTL_GETDEBUG) { si.data.dbg.int_rate = bc->debug_vals.last_intcnt; si.data.dbg.mod_cycles = bc->debug_vals.mod_cycles; si.data.dbg.demod_cycles = bc->debug_vals.demod_cycles; si.data.dbg.dma_residue = 0; bc->debug_vals.mod_cycles = bc->debug_vals.demod_cycles = 0; bc->debug_vals.last_intcnt = 0; if (copy_to_user(ifr->ifr_data, &si, sizeof(si))) return -EFAULT; return 0; } #endif /* BAYCOM_DEBUG */ if (copy_from_user(&hi, ifr->ifr_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 = bc->stats.tx_packets; hi.data.cs.tx_errors = bc->stats.tx_errors; hi.data.cs.rx_packets = bc->stats.rx_packets; hi.data.cs.rx_errors = bc->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: strncpy(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: strncpy(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(ifr->ifr_data, &hi, sizeof(hi))) return -EFAULT; return 0; } /* --------------------------------------------------------------------- */ /* * 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 int baycom_probe(struct net_device *dev) { static char ax25_bcast[AX25_ADDR_LEN] = { 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1 }; static char ax25_nocall[AX25_ADDR_LEN] = { 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1 }; const struct hdlcdrv_channel_params dflt_ch_params = { 20, 2, 10, 40, 0 }; struct baycom_state *bc; if (!dev) return -ENXIO; baycom_paranoia_check(dev, "baycom_probe", -ENXIO); /* * not a real probe! only initialize data structures */ bc = (struct baycom_state *)dev->priv; /* * initialize the baycom_state struct */ bc->ch_params = dflt_ch_params; bc->ptt_keyed = 0; /* * initialize the device struct */ dev->open = epp_open; dev->stop = epp_close; dev->do_ioctl = baycom_ioctl; dev->hard_start_xmit = baycom_send_packet; dev->get_stats = baycom_get_stats; /* Fill in the fields of the device structure */ dev_init_buffers(dev); bc->skb = NULL; #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) dev->hard_header = ax25_encapsulate; dev->rebuild_header = ax25_rebuild_header; #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */ dev->hard_header = NULL; dev->rebuild_header = NULL; #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */ dev->set_mac_address = baycom_set_mac_address; 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); memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN); dev->tx_queue_len = 16; /* New style flags */ dev->flags = 0; return 0; } /* --------------------------------------------------------------------- */ /* * command line settable parameters */ static const char *mode[NR_PORTS] = { "", }; static int iobase[NR_PORTS] = { 0x378, }; MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s"); MODULE_PARM_DESC(mode, "baycom operating mode"); MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i"); 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"); /* --------------------------------------------------------------------- */ static int __init init_baycomepp(void) { struct net_device *dev; int i, found = 0; char set_hw = 1; struct baycom_state *bc; printk(bc_drvinfo); /* * register net devices */ for (i = 0; i < NR_PORTS; i++) { dev = baycom_device+i; if (!mode[i]) set_hw = 0; if (!set_hw) iobase[i] = 0; memset(dev, 0, sizeof(struct net_device)); if (!(bc = dev->priv = kmalloc(sizeof(struct baycom_state), GFP_KERNEL))) return -ENOMEM; /* * initialize part of the baycom_state struct */ memset(bc, 0, sizeof(struct baycom_state)); bc->magic = BAYCOM_MAGIC; sprintf(dev->name, "bce%d", i); bc->cfg.fclk = 19666600; bc->cfg.bps = 9600; /* * initialize part of the device struct */ dev->if_port = 0; dev->init = baycom_probe; dev->base_addr = iobase[i]; dev->irq = 0; dev->dma = 0; if (register_netdev(dev)) { printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name); kfree(dev->priv); return -ENXIO; } if (set_hw && baycom_setmode(bc, mode[i])) set_hw = 0; found++; } if (!found) return -ENXIO; return 0; } static void __exit cleanup_baycomepp(void) { struct net_device *dev; struct baycom_state *bc; int i; for(i = 0; i < NR_PORTS; i++) { dev = baycom_device+i; bc = (struct baycom_state *)dev->priv; if (bc) { if (bc->magic == BAYCOM_MAGIC) { unregister_netdev(dev); kfree(dev->priv); } else printk(paranoia_str, "cleanup_module"); } } } 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 */ /* --------------------------------------------------------------------- */