600 lines
17 KiB
C
600 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*****************************************************************************/
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/*
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* baycom_par.c -- baycom par96 and picpar radio modem driver.
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*
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* Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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*
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* Please note that the GPL allows you to use the driver, NOT the radio.
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* In order to use the radio, you need a license from the communications
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* authority of your country.
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*
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* Supported modems
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*
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* par96: This is a modem for 9600 baud FSK compatible to the G3RUH standard.
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* The modem does all the filtering and regenerates the receiver clock.
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* Data is transferred from and to the PC via a shift register.
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* The shift register is filled with 16 bits and an interrupt is
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* signalled. The PC then empties the shift register in a burst. This
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* modem connects to the parallel port, hence the name. The modem
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* leaves the implementation of the HDLC protocol and the scrambler
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* polynomial to the PC. This modem is no longer available (at least
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* from Baycom) and has been replaced by the PICPAR modem (see below).
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* You may however still build one from the schematics published in
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* cq-DL :-).
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*
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* picpar: This is a redesign of the par96 modem by Henning Rech, DF9IC. The
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* modem is protocol compatible to par96, but uses only three low
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* power ICs and can therefore be fed from the parallel port and
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* does not require an additional power supply. It features
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* built in DCD circuitry. The driver should therefore be configured
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* for hardware DCD.
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*
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* Command line options (insmod command line)
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*
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* mode driver mode string. Valid choices are par96 and picpar.
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* iobase base address of the port; common values are 0x378, 0x278, 0x3bc
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*
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* History:
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* 0.1 26.06.1996 Adapted from baycom.c and made network driver interface
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* 18.10.1996 Changed to new user space access routines (copy_{to,from}_user)
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* 0.3 26.04.1997 init code/data tagged
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* 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints)
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* 0.5 11.11.1997 split into separate files for ser12/par96
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* 0.6 03.08.1999 adapt to Linus' new __setup/__initcall
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* removed some pre-2.2 kernel compatibility cruft
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* 0.7 10.08.1999 Check if parport can do SPP and is safe to access during interrupt contexts
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* 0.8 12.02.2000 adapted to softnet driver interface
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* removed direct parport access, uses parport driver methods
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* 0.9 03.07.2000 fix interface name handling
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*/
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/*****************************************************************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/hdlcdrv.h>
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#include <linux/baycom.h>
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#include <linux/parport.h>
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#include <linux/bitops.h>
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#include <linux/jiffies.h>
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#include <linux/uaccess.h>
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/* --------------------------------------------------------------------- */
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#define BAYCOM_DEBUG
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/*
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* modem options; bit mask
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*/
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#define BAYCOM_OPTIONS_SOFTDCD 1
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/* --------------------------------------------------------------------- */
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static const char bc_drvname[] = "baycom_par";
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static const char bc_drvinfo[] = KERN_INFO "baycom_par: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
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"baycom_par: version 0.9\n";
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/* --------------------------------------------------------------------- */
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#define NR_PORTS 4
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static struct net_device *baycom_device[NR_PORTS];
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/* --------------------------------------------------------------------- */
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#define PAR96_BURSTBITS 16
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#define PAR96_BURST 4
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#define PAR96_PTT 2
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#define PAR96_TXBIT 1
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#define PAR96_ACK 0x40
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#define PAR96_RXBIT 0x20
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#define PAR96_DCD 0x10
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#define PAR97_POWER 0xf8
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/* ---------------------------------------------------------------------- */
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/*
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* Information that need to be kept for each board.
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*/
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struct baycom_state {
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struct hdlcdrv_state hdrv;
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struct pardevice *pdev;
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unsigned int options;
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struct modem_state {
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short arb_divider;
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unsigned char flags;
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unsigned int shreg;
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struct modem_state_par96 {
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int dcd_count;
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unsigned int dcd_shreg;
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unsigned long descram;
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unsigned long scram;
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} par96;
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} modem;
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#ifdef BAYCOM_DEBUG
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struct debug_vals {
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unsigned long last_jiffies;
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unsigned cur_intcnt;
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unsigned last_intcnt;
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int cur_pllcorr;
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int last_pllcorr;
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} debug_vals;
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#endif /* BAYCOM_DEBUG */
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};
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/* --------------------------------------------------------------------- */
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static inline void baycom_int_freq(struct baycom_state *bc)
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{
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#ifdef BAYCOM_DEBUG
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unsigned long cur_jiffies = jiffies;
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/*
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* measure the interrupt frequency
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*/
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bc->debug_vals.cur_intcnt++;
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if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
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bc->debug_vals.last_jiffies = cur_jiffies;
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bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
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bc->debug_vals.cur_intcnt = 0;
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bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
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bc->debug_vals.cur_pllcorr = 0;
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}
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#endif /* BAYCOM_DEBUG */
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}
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/* --------------------------------------------------------------------- */
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/*
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* ===================== PAR96 specific routines =========================
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*/
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#define PAR96_DESCRAM_TAP1 0x20000
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#define PAR96_DESCRAM_TAP2 0x01000
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#define PAR96_DESCRAM_TAP3 0x00001
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#define PAR96_DESCRAM_TAPSH1 17
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#define PAR96_DESCRAM_TAPSH2 12
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#define PAR96_DESCRAM_TAPSH3 0
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#define PAR96_SCRAM_TAP1 0x20000 /* X^17 */
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#define PAR96_SCRAM_TAPN 0x00021 /* X^0+X^5 */
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/* --------------------------------------------------------------------- */
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static inline void par96_tx(struct net_device *dev, struct baycom_state *bc)
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{
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int i;
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unsigned int data = hdlcdrv_getbits(&bc->hdrv);
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struct parport *pp = bc->pdev->port;
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for(i = 0; i < PAR96_BURSTBITS; i++, data >>= 1) {
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unsigned char val = PAR97_POWER;
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bc->modem.par96.scram = ((bc->modem.par96.scram << 1) |
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(bc->modem.par96.scram & 1));
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if (!(data & 1))
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bc->modem.par96.scram ^= 1;
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if (bc->modem.par96.scram & (PAR96_SCRAM_TAP1 << 1))
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bc->modem.par96.scram ^=
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(PAR96_SCRAM_TAPN << 1);
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if (bc->modem.par96.scram & (PAR96_SCRAM_TAP1 << 2))
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val |= PAR96_TXBIT;
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pp->ops->write_data(pp, val);
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pp->ops->write_data(pp, val | PAR96_BURST);
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}
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}
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/* --------------------------------------------------------------------- */
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static inline void par96_rx(struct net_device *dev, struct baycom_state *bc)
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{
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int i;
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unsigned int data, mask, mask2, descx;
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struct parport *pp = bc->pdev->port;
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/*
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* do receiver; differential decode and descramble on the fly
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*/
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for(data = i = 0; i < PAR96_BURSTBITS; i++) {
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bc->modem.par96.descram = (bc->modem.par96.descram << 1);
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if (pp->ops->read_status(pp) & PAR96_RXBIT)
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bc->modem.par96.descram |= 1;
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descx = bc->modem.par96.descram ^
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(bc->modem.par96.descram >> 1);
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/* now the diff decoded data is inverted in descram */
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pp->ops->write_data(pp, PAR97_POWER | PAR96_PTT);
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descx ^= ((descx >> PAR96_DESCRAM_TAPSH1) ^
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(descx >> PAR96_DESCRAM_TAPSH2));
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data >>= 1;
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if (!(descx & 1))
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data |= 0x8000;
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pp->ops->write_data(pp, PAR97_POWER | PAR96_PTT | PAR96_BURST);
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}
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hdlcdrv_putbits(&bc->hdrv, data);
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/*
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* do DCD algorithm
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*/
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if (bc->options & BAYCOM_OPTIONS_SOFTDCD) {
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bc->modem.par96.dcd_shreg = (bc->modem.par96.dcd_shreg >> 16)
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| (data << 16);
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/* search for flags and set the dcd counter appropriately */
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for(mask = 0x1fe00, mask2 = 0xfc00, i = 0;
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i < PAR96_BURSTBITS; i++, mask <<= 1, mask2 <<= 1)
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if ((bc->modem.par96.dcd_shreg & mask) == mask2)
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bc->modem.par96.dcd_count = HDLCDRV_MAXFLEN+4;
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/* check for abort/noise sequences */
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for(mask = 0x1fe00, mask2 = 0x1fe00, i = 0;
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i < PAR96_BURSTBITS; i++, mask <<= 1, mask2 <<= 1)
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if (((bc->modem.par96.dcd_shreg & mask) == mask2) &&
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(bc->modem.par96.dcd_count >= 0))
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bc->modem.par96.dcd_count -= HDLCDRV_MAXFLEN-10;
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/* decrement and set the dcd variable */
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if (bc->modem.par96.dcd_count >= 0)
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bc->modem.par96.dcd_count -= 2;
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hdlcdrv_setdcd(&bc->hdrv, bc->modem.par96.dcd_count > 0);
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} else {
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hdlcdrv_setdcd(&bc->hdrv, !!(pp->ops->read_status(pp) & PAR96_DCD));
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}
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}
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/* --------------------------------------------------------------------- */
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static void par96_interrupt(void *dev_id)
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{
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struct net_device *dev = dev_id;
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struct baycom_state *bc = netdev_priv(dev);
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baycom_int_freq(bc);
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/*
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* check if transmitter active
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*/
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if (hdlcdrv_ptt(&bc->hdrv))
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par96_tx(dev, bc);
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else {
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par96_rx(dev, bc);
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if (--bc->modem.arb_divider <= 0) {
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bc->modem.arb_divider = 6;
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local_irq_enable();
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hdlcdrv_arbitrate(dev, &bc->hdrv);
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}
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}
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local_irq_enable();
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hdlcdrv_transmitter(dev, &bc->hdrv);
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hdlcdrv_receiver(dev, &bc->hdrv);
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local_irq_disable();
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}
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/* --------------------------------------------------------------------- */
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static void par96_wakeup(void *handle)
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{
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struct net_device *dev = (struct net_device *)handle;
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struct baycom_state *bc = netdev_priv(dev);
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printk(KERN_DEBUG "baycom_par: %s: why am I being woken up?\n", dev->name);
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if (!parport_claim(bc->pdev))
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printk(KERN_DEBUG "baycom_par: %s: I'm broken.\n", dev->name);
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}
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/* --------------------------------------------------------------------- */
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static int par96_open(struct net_device *dev)
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{
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struct baycom_state *bc = netdev_priv(dev);
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struct pardev_cb par_cb;
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struct parport *pp;
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int i;
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if (!dev || !bc)
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return -ENXIO;
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pp = parport_find_base(dev->base_addr);
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if (!pp) {
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printk(KERN_ERR "baycom_par: parport at 0x%lx unknown\n", dev->base_addr);
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return -ENXIO;
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}
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if (pp->irq < 0) {
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printk(KERN_ERR "baycom_par: parport at 0x%lx has no irq\n", pp->base);
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parport_put_port(pp);
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return -ENXIO;
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}
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if ((~pp->modes) & (PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
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printk(KERN_ERR "baycom_par: parport at 0x%lx cannot be used\n", pp->base);
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parport_put_port(pp);
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return -ENXIO;
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}
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memset(&bc->modem, 0, sizeof(bc->modem));
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bc->hdrv.par.bitrate = 9600;
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memset(&par_cb, 0, sizeof(par_cb));
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par_cb.wakeup = par96_wakeup;
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par_cb.irq_func = par96_interrupt;
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par_cb.private = (void *)dev;
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par_cb.flags = PARPORT_DEV_EXCL;
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for (i = 0; i < NR_PORTS; i++)
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if (baycom_device[i] == dev)
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break;
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if (i == NR_PORTS) {
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pr_err("%s: no device found\n", bc_drvname);
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parport_put_port(pp);
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return -ENODEV;
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}
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bc->pdev = parport_register_dev_model(pp, dev->name, &par_cb, i);
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parport_put_port(pp);
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if (!bc->pdev) {
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printk(KERN_ERR "baycom_par: cannot register parport at 0x%lx\n", dev->base_addr);
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return -ENXIO;
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}
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if (parport_claim(bc->pdev)) {
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printk(KERN_ERR "baycom_par: parport at 0x%lx busy\n", pp->base);
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parport_unregister_device(bc->pdev);
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return -EBUSY;
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}
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pp = bc->pdev->port;
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dev->irq = pp->irq;
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pp->ops->data_forward(pp);
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bc->hdrv.par.bitrate = 9600;
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pp->ops->write_data(pp, PAR96_PTT | PAR97_POWER); /* switch off PTT */
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pp->ops->enable_irq(pp);
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printk(KERN_INFO "%s: par96 at iobase 0x%lx irq %u options 0x%x\n",
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bc_drvname, dev->base_addr, dev->irq, bc->options);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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static int par96_close(struct net_device *dev)
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{
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struct baycom_state *bc = netdev_priv(dev);
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struct parport *pp;
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if (!dev || !bc)
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return -EINVAL;
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pp = bc->pdev->port;
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/* disable interrupt */
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pp->ops->disable_irq(pp);
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/* switch off PTT */
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pp->ops->write_data(pp, PAR96_PTT | PAR97_POWER);
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parport_release(bc->pdev);
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parport_unregister_device(bc->pdev);
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printk(KERN_INFO "%s: close par96 at iobase 0x%lx irq %u\n",
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bc_drvname, dev->base_addr, dev->irq);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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/*
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* ===================== hdlcdrv driver interface =========================
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*/
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static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
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struct hdlcdrv_ioctl *hi, int cmd);
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/* --------------------------------------------------------------------- */
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static const struct hdlcdrv_ops par96_ops = {
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.drvname = bc_drvname,
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.drvinfo = bc_drvinfo,
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.open = par96_open,
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.close = par96_close,
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.ioctl = baycom_ioctl
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};
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/* --------------------------------------------------------------------- */
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static int baycom_setmode(struct baycom_state *bc, const char *modestr)
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{
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if (!strncmp(modestr, "picpar", 6))
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bc->options = 0;
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else if (!strncmp(modestr, "par96", 5))
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bc->options = BAYCOM_OPTIONS_SOFTDCD;
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else
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bc->options = !!strchr(modestr, '*');
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return 0;
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}
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/* --------------------------------------------------------------------- */
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static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
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struct hdlcdrv_ioctl *hi, int cmd)
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{
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struct baycom_state *bc;
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struct baycom_ioctl bi;
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if (!dev)
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return -EINVAL;
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bc = netdev_priv(dev);
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BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
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if (cmd != SIOCDEVPRIVATE)
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return -ENOIOCTLCMD;
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switch (hi->cmd) {
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default:
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break;
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case HDLCDRVCTL_GETMODE:
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strcpy(hi->data.modename, bc->options ? "par96" : "picpar");
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if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
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return -EFAULT;
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return 0;
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case HDLCDRVCTL_SETMODE:
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if (netif_running(dev) || !capable(CAP_NET_ADMIN))
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return -EACCES;
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hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
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return baycom_setmode(bc, hi->data.modename);
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case HDLCDRVCTL_MODELIST:
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strcpy(hi->data.modename, "par96,picpar");
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if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
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return -EFAULT;
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return 0;
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case HDLCDRVCTL_MODEMPARMASK:
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return HDLCDRV_PARMASK_IOBASE;
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}
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if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
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return -EFAULT;
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switch (bi.cmd) {
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default:
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return -ENOIOCTLCMD;
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#ifdef BAYCOM_DEBUG
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case BAYCOMCTL_GETDEBUG:
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bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
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bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
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bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
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break;
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#endif /* BAYCOM_DEBUG */
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}
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if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
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return -EFAULT;
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return 0;
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}
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/* --------------------------------------------------------------------- */
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/*
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* command line settable parameters
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*/
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static char *mode[NR_PORTS] = { "picpar", };
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static int iobase[NR_PORTS] = { 0x378, };
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module_param_array(mode, charp, NULL, 0);
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MODULE_PARM_DESC(mode, "baycom operating mode; eg. par96 or picpar");
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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 par96 and picpar amateur radio modem driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static int baycom_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_par_driver = {
|
|
.name = "bcp",
|
|
.probe = baycom_par_probe,
|
|
.devmodel = true,
|
|
};
|
|
|
|
static int __init init_baycompar(void)
|
|
{
|
|
int i, found = 0, ret;
|
|
char set_hw = 1;
|
|
|
|
printk(bc_drvinfo);
|
|
|
|
ret = parport_register_driver(&baycom_par_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* register net devices
|
|
*/
|
|
for (i = 0; i < NR_PORTS; i++) {
|
|
struct net_device *dev;
|
|
struct baycom_state *bc;
|
|
char ifname[IFNAMSIZ];
|
|
|
|
sprintf(ifname, "bcp%d", i);
|
|
|
|
if (!mode[i])
|
|
set_hw = 0;
|
|
if (!set_hw)
|
|
iobase[i] = 0;
|
|
|
|
dev = hdlcdrv_register(&par96_ops,
|
|
sizeof(struct baycom_state),
|
|
ifname, iobase[i], 0, 0);
|
|
if (IS_ERR(dev))
|
|
break;
|
|
|
|
bc = netdev_priv(dev);
|
|
if (set_hw && baycom_setmode(bc, mode[i]))
|
|
set_hw = 0;
|
|
found++;
|
|
baycom_device[i] = dev;
|
|
}
|
|
|
|
if (!found) {
|
|
parport_unregister_driver(&baycom_par_driver);
|
|
return -ENXIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup_baycompar(void)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < NR_PORTS; i++) {
|
|
struct net_device *dev = baycom_device[i];
|
|
|
|
if (dev)
|
|
hdlcdrv_unregister(dev);
|
|
}
|
|
parport_unregister_driver(&baycom_par_driver);
|
|
}
|
|
|
|
module_init(init_baycompar);
|
|
module_exit(cleanup_baycompar);
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
#ifndef MODULE
|
|
|
|
/*
|
|
* format: baycom_par=io,mode
|
|
* mode: par96,picpar
|
|
*/
|
|
|
|
static int __init baycom_par_setup(char *str)
|
|
{
|
|
static unsigned nr_dev;
|
|
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_par=", baycom_par_setup);
|
|
|
|
#endif /* MODULE */
|
|
/* --------------------------------------------------------------------- */
|