diff options
Diffstat (limited to 'drivers/net/hamradio/baycom_epp.c')
| -rw-r--r-- | drivers/net/hamradio/baycom_epp.c | 1338 |
1 files changed, 1338 insertions, 0 deletions
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c new file mode 100644 index 000000000..1e62d0073 --- /dev/null +++ b/drivers/net/hamradio/baycom_epp.c @@ -0,0 +1,1338 @@ +/*****************************************************************************/ + +/* + * 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 <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 ((prandom_u32() % 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_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; + } + + default: /* fall through */ + 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; +} + +/* --------------------------------------------------------------------- */ + +#ifdef __i386__ +#include <asm/msr.h> +#define GETTICK(x) \ +({ \ + if (boot_cpu_has(X86_FEATURE_TSC)) \ + x = (unsigned int)rdtsc(); \ +}) +#else /* __i386__ */ +#define GETTICK(x) +#endif /* __i386__ */ + +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 int 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 */ + memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); + 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); + 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); + 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 = netdev_priv(dev); + struct hdlcdrv_ioctl hi; + + if (cmd != SIOCDEVPRIVATE) + return -ENOIOCTLCMD; + + 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 = 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: + 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; +} + +/* --------------------------------------------------------------------- */ + +static const struct net_device_ops baycom_netdev_ops = { + .ndo_open = epp_open, + .ndo_stop = epp_close, + .ndo_do_ioctl = baycom_ioctl, + .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); + memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN); + 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 */ +/* --------------------------------------------------------------------- */ |