678 lines
19 KiB
C
678 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*****************************************************************************/
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/*
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* baycom_ser_fdx.c -- baycom ser12 fullduplex 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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* ser12: This is a very simple 1200 baud AFSK modem. The modem consists only
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* of a modulator/demodulator chip, usually a TI TCM3105. The computer
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* is responsible for regenerating the receiver bit clock, as well as
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* for handling the HDLC protocol. The modem connects to a serial port,
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* hence the name. Since the serial port is not used as an async serial
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* port, the kernel driver for serial ports cannot be used, and this
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* driver only supports standard serial hardware (8250, 16450, 16550A)
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*
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* This modem usually draws its supply current out of the otherwise unused
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* TXD pin of the serial port. Thus a contiguous stream of 0x00-bytes
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* is transmitted to achieve a positive supply voltage.
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*
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* hsk: This is a 4800 baud FSK modem, designed for TNC use. It works fine
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* in 'baycom-mode' :-) In contrast to the TCM3105 modem, power is
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* externally supplied. So there's no need to provide the 0x00-byte-stream
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* when receiving or idle, which drastically reduces interrupt load.
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*
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* Command line options (insmod command line)
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*
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* mode ser# hardware DCD
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* ser#* software DCD
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* ser#+ hardware DCD, inverted signal at DCD pin
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* '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
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* iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
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* baud baud rate (between 300 and 4800)
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* irq interrupt line of the port; common values are 4,3
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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 ser12/par96 split into separate files
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* 0.6 24.01.1998 Thorsten Kranzkowski, dl8bcu and Thomas Sailer:
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* reduced interrupt load in transmit case
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* reworked receiver
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* 0.7 03.08.1999 adapt to Linus' new __setup/__initcall
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* 0.8 10.08.1999 use module_init/module_exit
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* 0.9 12.02.2000 adapted to softnet driver interface
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* 0.10 03.07.2000 fix interface name handling
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*/
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/*****************************************************************************/
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/hdlcdrv.h>
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#include <linux/baycom.h>
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#include <linux/jiffies.h>
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#include <linux/time64.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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/* --------------------------------------------------------------------- */
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#define BAYCOM_DEBUG
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/* --------------------------------------------------------------------- */
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static const char bc_drvname[] = "baycom_ser_fdx";
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static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
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"baycom_ser_fdx: version 0.10\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 RBR(iobase) (iobase+0)
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#define THR(iobase) (iobase+0)
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#define IER(iobase) (iobase+1)
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#define IIR(iobase) (iobase+2)
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#define FCR(iobase) (iobase+2)
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#define LCR(iobase) (iobase+3)
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#define MCR(iobase) (iobase+4)
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#define LSR(iobase) (iobase+5)
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#define MSR(iobase) (iobase+6)
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#define SCR(iobase) (iobase+7)
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#define DLL(iobase) (iobase+0)
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#define DLM(iobase) (iobase+1)
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#define SER12_EXTENT 8
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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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unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
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int opt_dcd;
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struct modem_state {
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unsigned char flags;
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unsigned char ptt;
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unsigned int shreg;
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struct modem_state_ser12 {
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unsigned char tx_bit;
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unsigned char last_rxbit;
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int dcd_sum0, dcd_sum1, dcd_sum2;
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int dcd_time;
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unsigned int pll_time;
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unsigned int txshreg;
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} ser12;
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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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* ===================== SER12 specific routines =========================
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*/
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/* --------------------------------------------------------------------- */
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static inline void ser12_set_divisor(struct net_device *dev,
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unsigned int divisor)
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{
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outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */
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outb(divisor, DLL(dev->base_addr));
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outb(divisor >> 8, DLM(dev->base_addr));
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outb(0x01, LCR(dev->base_addr)); /* word length = 6 */
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/*
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* make sure the next interrupt is generated;
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* 0 must be used to power the modem; the modem draws its
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* power from the TxD line
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*/
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outb(0x00, THR(dev->base_addr));
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/*
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* it is important not to set the divider while transmitting;
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* this reportedly makes some UARTs generating interrupts
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* in the hundredthousands per second region
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* Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
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*/
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}
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static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timespec64 *ts, unsigned char curs)
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{
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int timediff;
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int bdus8 = bc->baud_us >> 3;
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int bdus4 = bc->baud_us >> 2;
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int bdus2 = bc->baud_us >> 1;
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timediff = 1000000 + ts->tv_nsec / NSEC_PER_USEC -
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bc->modem.ser12.pll_time;
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while (timediff >= 500000)
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timediff -= 1000000;
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while (timediff >= bdus2) {
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timediff -= bc->baud_us;
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bc->modem.ser12.pll_time += bc->baud_us;
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bc->modem.ser12.dcd_time--;
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/* first check if there is room to add a bit */
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if (bc->modem.shreg & 1) {
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hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
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bc->modem.shreg = 0x10000;
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}
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/* add a one bit */
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bc->modem.shreg >>= 1;
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}
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if (bc->modem.ser12.dcd_time <= 0) {
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if (!bc->opt_dcd)
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hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
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bc->modem.ser12.dcd_sum1 +
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bc->modem.ser12.dcd_sum2) < 0);
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bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
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bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
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bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
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bc->modem.ser12.dcd_time += 120;
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}
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if (bc->modem.ser12.last_rxbit != curs) {
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bc->modem.ser12.last_rxbit = curs;
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bc->modem.shreg |= 0x10000;
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/* adjust the PLL */
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if (timediff > 0)
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bc->modem.ser12.pll_time += bdus8;
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else
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bc->modem.ser12.pll_time += 1000000 - bdus8;
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/* update DCD */
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if (abs(timediff) > bdus4)
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bc->modem.ser12.dcd_sum0 += 4;
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else
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bc->modem.ser12.dcd_sum0--;
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#ifdef BAYCOM_DEBUG
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bc->debug_vals.cur_pllcorr = timediff;
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#endif /* BAYCOM_DEBUG */
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}
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while (bc->modem.ser12.pll_time >= 1000000)
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bc->modem.ser12.pll_time -= 1000000;
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}
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/* --------------------------------------------------------------------- */
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static irqreturn_t ser12_interrupt(int irq, void *dev_id)
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{
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struct net_device *dev = (struct net_device *)dev_id;
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struct baycom_state *bc = netdev_priv(dev);
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struct timespec64 ts;
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unsigned char iir, msr;
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unsigned int txcount = 0;
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if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
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return IRQ_NONE;
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/* fast way out for shared irq */
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if ((iir = inb(IIR(dev->base_addr))) & 1)
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return IRQ_NONE;
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/* get current time */
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ktime_get_ts64(&ts);
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msr = inb(MSR(dev->base_addr));
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/* delta DCD */
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if ((msr & 8) && bc->opt_dcd)
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hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
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do {
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switch (iir & 6) {
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case 6:
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inb(LSR(dev->base_addr));
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break;
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case 4:
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inb(RBR(dev->base_addr));
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break;
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case 2:
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/*
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* make sure the next interrupt is generated;
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* 0 must be used to power the modem; the modem draws its
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* power from the TxD line
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*/
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outb(0x00, THR(dev->base_addr));
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baycom_int_freq(bc);
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txcount++;
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/*
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* first output the last bit (!) then call HDLC transmitter,
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* since this may take quite long
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*/
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if (bc->modem.ptt)
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outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
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else
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outb(0x0d, MCR(dev->base_addr)); /* transmitter off */
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break;
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default:
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msr = inb(MSR(dev->base_addr));
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/* delta DCD */
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if ((msr & 8) && bc->opt_dcd)
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hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
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break;
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}
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iir = inb(IIR(dev->base_addr));
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} while (!(iir & 1));
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ser12_rx(dev, bc, &ts, msr & 0x10); /* CTS */
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if (bc->modem.ptt && txcount) {
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if (bc->modem.ser12.txshreg <= 1) {
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bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
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if (!hdlcdrv_ptt(&bc->hdrv)) {
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ser12_set_divisor(dev, 115200/100/8);
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bc->modem.ptt = 0;
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goto end_transmit;
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}
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}
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bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
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bc->modem.ser12.txshreg >>= 1;
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}
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end_transmit:
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local_irq_enable();
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if (!bc->modem.ptt && txcount) {
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hdlcdrv_arbitrate(dev, &bc->hdrv);
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if (hdlcdrv_ptt(&bc->hdrv)) {
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ser12_set_divisor(dev, bc->baud_uartdiv);
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bc->modem.ser12.txshreg = 1;
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bc->modem.ptt = 1;
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}
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}
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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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return IRQ_HANDLED;
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}
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/* --------------------------------------------------------------------- */
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enum uart { c_uart_unknown, c_uart_8250,
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c_uart_16450, c_uart_16550, c_uart_16550A};
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static const char *uart_str[] = {
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"unknown", "8250", "16450", "16550", "16550A"
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};
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static enum uart ser12_check_uart(unsigned int iobase)
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{
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unsigned char b1,b2,b3;
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enum uart u;
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enum uart uart_tab[] =
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{ c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
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b1 = inb(MCR(iobase));
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outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
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b2 = inb(MSR(iobase));
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outb(0x1a, MCR(iobase));
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b3 = inb(MSR(iobase)) & 0xf0;
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outb(b1, MCR(iobase)); /* restore old values */
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outb(b2, MSR(iobase));
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if (b3 != 0x90)
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return c_uart_unknown;
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inb(RBR(iobase));
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inb(RBR(iobase));
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outb(0x01, FCR(iobase)); /* enable FIFOs */
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u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
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if (u == c_uart_16450) {
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outb(0x5a, SCR(iobase));
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b1 = inb(SCR(iobase));
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outb(0xa5, SCR(iobase));
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b2 = inb(SCR(iobase));
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if ((b1 != 0x5a) || (b2 != 0xa5))
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u = c_uart_8250;
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}
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return u;
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}
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/* --------------------------------------------------------------------- */
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static int ser12_open(struct net_device *dev)
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{
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struct baycom_state *bc = netdev_priv(dev);
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enum uart u;
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if (!dev || !bc)
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return -ENXIO;
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if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
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dev->irq < 2 || dev->irq > nr_irqs) {
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printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
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"or irq (2 <= irq <= %d)\n",
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0xffff-SER12_EXTENT, nr_irqs);
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return -ENXIO;
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}
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if (bc->baud < 300 || bc->baud > 4800) {
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printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
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"(300...4800)\n");
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return -EINVAL;
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}
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if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
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printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n",
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dev->base_addr);
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return -EACCES;
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}
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memset(&bc->modem, 0, sizeof(bc->modem));
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bc->hdrv.par.bitrate = bc->baud;
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bc->baud_us = 1000000/bc->baud;
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bc->baud_uartdiv = (115200/8)/bc->baud;
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if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
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release_region(dev->base_addr, SER12_EXTENT);
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return -EIO;
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}
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outb(0, FCR(dev->base_addr)); /* disable FIFOs */
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outb(0x0d, MCR(dev->base_addr));
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outb(0, IER(dev->base_addr));
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if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED,
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"baycom_ser_fdx", dev)) {
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release_region(dev->base_addr, SER12_EXTENT);
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return -EBUSY;
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}
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/*
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* set the SIO to 6 Bits/character; during receive,
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* the baud rate is set to produce 100 ints/sec
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* to feed the channel arbitration process,
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* during transmit to baud ints/sec to run
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* the transmitter
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*/
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ser12_set_divisor(dev, 115200/100/8);
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/*
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* enable transmitter empty interrupt and modem status interrupt
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*/
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outb(0x0a, IER(dev->base_addr));
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/*
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* make sure the next interrupt is generated;
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* 0 must be used to power the modem; the modem draws its
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* power from the TxD line
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*/
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outb(0x00, THR(dev->base_addr));
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hdlcdrv_setdcd(&bc->hdrv, 0);
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printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
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bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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static int ser12_close(struct net_device *dev)
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{
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struct baycom_state *bc = netdev_priv(dev);
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if (!dev || !bc)
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return -EINVAL;
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/*
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* disable interrupts
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*/
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outb(0, IER(dev->base_addr));
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outb(1, MCR(dev->base_addr));
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free_irq(dev->irq, dev);
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release_region(dev->base_addr, SER12_EXTENT);
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printk(KERN_INFO "%s: close ser_fdx 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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/* --------------------------------------------------------------------- */
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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 ser12_ops = {
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.drvname = bc_drvname,
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.drvinfo = bc_drvinfo,
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.open = ser12_open,
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.close = ser12_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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unsigned int baud;
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if (!strncmp(modestr, "ser", 3)) {
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baud = simple_strtoul(modestr+3, NULL, 10);
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if (baud >= 3 && baud <= 48)
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bc->baud = baud*100;
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}
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if (strchr(modestr, '*'))
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bc->opt_dcd = 0;
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else if (strchr(modestr, '+'))
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bc->opt_dcd = -1;
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else
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bc->opt_dcd = 1;
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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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sprintf(hi->data.modename, "ser%u", bc->baud / 100);
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if (bc->opt_dcd <= 0)
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strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
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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, "ser12,ser3,ser24");
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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 | HDLCDRV_PARMASK_IRQ;
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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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* command line settable parameters
|
|
*/
|
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static char *mode[NR_PORTS] = { "ser12*", };
|
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static int iobase[NR_PORTS] = { 0x3f8, };
|
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static int irq[NR_PORTS] = { 4, };
|
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static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
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|
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module_param_array(mode, charp, NULL, 0);
|
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MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
|
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module_param_hw_array(iobase, int, ioport, NULL, 0);
|
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MODULE_PARM_DESC(iobase, "baycom io base address");
|
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module_param_hw_array(irq, int, irq, NULL, 0);
|
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MODULE_PARM_DESC(irq, "baycom irq number");
|
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module_param_array(baud, int, NULL, 0);
|
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MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
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|
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MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
|
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MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
|
|
MODULE_LICENSE("GPL");
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|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static int __init init_baycomserfdx(void)
|
|
{
|
|
int i, found = 0;
|
|
char set_hw = 1;
|
|
|
|
printk(bc_drvinfo);
|
|
/*
|
|
* register net devices
|
|
*/
|
|
for (i = 0; i < NR_PORTS; i++) {
|
|
struct net_device *dev;
|
|
struct baycom_state *bc;
|
|
char ifname[IFNAMSIZ];
|
|
|
|
sprintf(ifname, "bcsf%d", i);
|
|
|
|
if (!mode[i])
|
|
set_hw = 0;
|
|
if (!set_hw)
|
|
iobase[i] = irq[i] = 0;
|
|
|
|
dev = hdlcdrv_register(&ser12_ops,
|
|
sizeof(struct baycom_state),
|
|
ifname, iobase[i], irq[i], 0);
|
|
if (IS_ERR(dev))
|
|
break;
|
|
|
|
bc = netdev_priv(dev);
|
|
if (set_hw && baycom_setmode(bc, mode[i]))
|
|
set_hw = 0;
|
|
bc->baud = baud[i];
|
|
found++;
|
|
baycom_device[i] = dev;
|
|
}
|
|
|
|
if (!found)
|
|
return -ENXIO;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup_baycomserfdx(void)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < NR_PORTS; i++) {
|
|
struct net_device *dev = baycom_device[i];
|
|
if (dev)
|
|
hdlcdrv_unregister(dev);
|
|
}
|
|
}
|
|
|
|
module_init(init_baycomserfdx);
|
|
module_exit(cleanup_baycomserfdx);
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
#ifndef MODULE
|
|
|
|
/*
|
|
* format: baycom_ser_fdx=io,irq,mode
|
|
* mode: ser# hardware DCD
|
|
* ser#* software DCD
|
|
* ser#+ hardware DCD, inverted signal at DCD pin
|
|
* '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
|
|
*/
|
|
|
|
static int __init baycom_ser_fdx_setup(char *str)
|
|
{
|
|
static unsigned nr_dev;
|
|
int ints[4];
|
|
|
|
if (nr_dev >= NR_PORTS)
|
|
return 0;
|
|
str = get_options(str, 4, ints);
|
|
if (ints[0] < 2)
|
|
return 0;
|
|
mode[nr_dev] = str;
|
|
iobase[nr_dev] = ints[1];
|
|
irq[nr_dev] = ints[2];
|
|
if (ints[0] >= 3)
|
|
baud[nr_dev] = ints[3];
|
|
nr_dev++;
|
|
return 1;
|
|
}
|
|
|
|
__setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
|
|
|
|
#endif /* MODULE */
|
|
/* --------------------------------------------------------------------- */
|