patch-2.1.71 linux/drivers/net/baycom_par.c
Next file: linux/drivers/net/baycom_ser_fdx.c
Previous file: linux/drivers/net/Makefile
Back to the patch index
Back to the overall index
- Lines: 662
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.1.70/linux/drivers/net/baycom_par.c
- Orig date:
Mon Dec 1 12:04:12 1997
diff -u --recursive --new-file v2.1.70/linux/drivers/net/baycom_par.c linux/drivers/net/baycom_par.c
@@ -1,661 +0,0 @@
-/*****************************************************************************/
-
-/*
- * baycom_par.c -- baycom par96 and picpar radio modem driver.
- *
- * Copyright (C) 1997 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.
- *
- *
- * Supported modems
- *
- * par96: This is a modem for 9600 baud FSK compatible to the G3RUH standard.
- * The modem does all the filtering and regenerates the receiver clock.
- * Data is transferred from and to the PC via a shift register.
- * The shift register is filled with 16 bits and an interrupt is
- * signalled. The PC then empties the shift register in a burst. This
- * modem connects to the parallel port, hence the name. The modem
- * leaves the implementation of the HDLC protocol and the scrambler
- * polynomial to the PC. This modem is no longer available (at least
- * from Baycom) and has been replaced by the PICPAR modem (see below).
- * You may however still build one from the schematics published in
- * cq-DL :-).
- *
- * picpar: This is a redesign of the par96 modem by Henning Rech, DF9IC. The
- * modem is protocol compatible to par96, but uses only three low
- * power ICs and can therefore be fed from the parallel port and
- * does not require an additional power supply. It features
- * built in DCD circuitry. The driver should therefore be configured
- * for hardware DCD.
- *
- *
- * Command line options (insmod command line)
- *
- * mode driver mode string. Valid choices are par96 and picpar.
- * iobase base address of the port; common values are 0x378, 0x278, 0x3bc
- *
- *
- * History:
- * 0.1 26.06.96 Adapted from baycom.c and made network driver interface
- * 18.10.96 Changed to new user space access routines (copy_{to,from}_user)
- * 0.3 26.04.97 init code/data tagged
- * 0.4 08.07.97 alternative ser12 decoding algorithm (uses delta CTS ints)
- * 0.5 11.11.97 split into separate files for ser12/par96
- */
-
-/*****************************************************************************/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/in.h>
-#include <linux/string.h>
-#include <asm/system.h>
-#include <asm/bitops.h>
-#include <asm/io.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/netdevice.h>
-#include <linux/hdlcdrv.h>
-#include <linux/baycom.h>
-#include <linux/parport.h>
-
-/* --------------------------------------------------------------------- */
-
-/*
- * currently this module is supposed to support both module styles, i.e.
- * the old one present up to about 2.1.9, and the new one functioning
- * starting with 2.1.21. The reason is I have a kit allowing to compile
- * this module also under 2.0.x which was requested by several people.
- * This will go in 2.2
- */
-#include <linux/version.h>
-
-#if LINUX_VERSION_CODE >= 0x20100
-#include <asm/uaccess.h>
-#else
-#include <asm/segment.h>
-#include <linux/mm.h>
-
-#undef put_user
-#undef get_user
-
-#define put_user(x,ptr) ({ __put_user((unsigned long)(x),(ptr),sizeof(*(ptr))); 0; })
-#define get_user(x,ptr) ({ x = ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr)))); 0; })
-
-extern __inline__ int copy_from_user(void *to, const void *from, unsigned long n)
-{
- int i = verify_area(VERIFY_READ, from, n);
- if (i)
- return i;
- memcpy_fromfs(to, from, n);
- return 0;
-}
-
-extern __inline__ int copy_to_user(void *to, const void *from, unsigned long n)
-{
- int i = verify_area(VERIFY_WRITE, to, n);
- if (i)
- return i;
- memcpy_tofs(to, from, n);
- return 0;
-}
-#endif
-
-#if LINUX_VERSION_CODE >= 0x20123
-#include <linux/init.h>
-#else
-#define __init
-#define __initdata
-#define __initfunc(x) x
-#endif
-
-/* --------------------------------------------------------------------- */
-
-#define BAYCOM_DEBUG
-
-/*
- * modem options; bit mask
- */
-#define BAYCOM_OPTIONS_SOFTDCD 1
-
-/* --------------------------------------------------------------------- */
-
-static const char bc_drvname[] = "baycom_par";
-static const char bc_drvinfo[] = KERN_INFO "baycom_par: (C) 1997 Thomas Sailer, HB9JNX/AE4WA\n"
-KERN_INFO "baycom_par: version 0.5 compiled " __TIME__ " " __DATE__ "\n";
-
-/* --------------------------------------------------------------------- */
-
-#define NR_PORTS 4
-
-static struct device baycom_device[NR_PORTS];
-
-static struct {
- const char *mode;
- int iobase;
-} baycom_ports[NR_PORTS] = { { NULL, 0 }, };
-
-/* --------------------------------------------------------------------- */
-
-#define SER12_EXTENT 8
-
-#define LPT_DATA(dev) ((dev)->base_addr+0)
-#define LPT_STATUS(dev) ((dev)->base_addr+1)
-#define LPT_CONTROL(dev) ((dev)->base_addr+2)
-#define LPT_IRQ_ENABLE 0x10
-
-#define PAR96_BURSTBITS 16
-#define PAR96_BURST 4
-#define PAR96_PTT 2
-#define PAR96_TXBIT 1
-#define PAR96_ACK 0x40
-#define PAR96_RXBIT 0x20
-#define PAR96_DCD 0x10
-#define PAR97_POWER 0xf8
-
-/* ---------------------------------------------------------------------- */
-/*
- * Information that need to be kept for each board.
- */
-
-struct baycom_state {
- struct hdlcdrv_state hdrv;
-
- struct pardevice *pdev;
- unsigned int options;
-
- struct modem_state {
- short arb_divider;
- unsigned char flags;
- unsigned int shreg;
- struct modem_state_par96 {
- int dcd_count;
- unsigned int dcd_shreg;
- unsigned long descram;
- unsigned long scram;
- } par96;
- } modem;
-
-#ifdef BAYCOM_DEBUG
- struct debug_vals {
- unsigned long last_jiffies;
- unsigned cur_intcnt;
- unsigned last_intcnt;
- int cur_pllcorr;
- int last_pllcorr;
- } debug_vals;
-#endif /* BAYCOM_DEBUG */
-};
-
-/* --------------------------------------------------------------------- */
-
-#define min(a, b) (((a) < (b)) ? (a) : (b))
-#define max(a, b) (((a) > (b)) ? (a) : (b))
-
-/* --------------------------------------------------------------------- */
-
-static void __inline__ baycom_int_freq(struct baycom_state *bc)
-{
-#ifdef BAYCOM_DEBUG
- unsigned long cur_jiffies = jiffies;
- /*
- * measure the interrupt frequency
- */
- bc->debug_vals.cur_intcnt++;
- if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
- bc->debug_vals.last_jiffies = cur_jiffies;
- bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
- bc->debug_vals.cur_intcnt = 0;
- bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
- bc->debug_vals.cur_pllcorr = 0;
- }
-#endif /* BAYCOM_DEBUG */
-}
-
-/* --------------------------------------------------------------------- */
-/*
- * ===================== PAR96 specific routines =========================
- */
-
-#define PAR96_DESCRAM_TAP1 0x20000
-#define PAR96_DESCRAM_TAP2 0x01000
-#define PAR96_DESCRAM_TAP3 0x00001
-
-#define PAR96_DESCRAM_TAPSH1 17
-#define PAR96_DESCRAM_TAPSH2 12
-#define PAR96_DESCRAM_TAPSH3 0
-
-#define PAR96_SCRAM_TAP1 0x20000 /* X^17 */
-#define PAR96_SCRAM_TAPN 0x00021 /* X^0+X^5 */
-
-/* --------------------------------------------------------------------- */
-
-static __inline__ void par96_tx(struct device *dev, struct baycom_state *bc)
-{
- int i;
- unsigned int data = hdlcdrv_getbits(&bc->hdrv);
-
- for(i = 0; i < PAR96_BURSTBITS; i++, data >>= 1) {
- unsigned char val = PAR97_POWER;
- bc->modem.par96.scram = ((bc->modem.par96.scram << 1) |
- (bc->modem.par96.scram & 1));
- if (!(data & 1))
- bc->modem.par96.scram ^= 1;
- if (bc->modem.par96.scram & (PAR96_SCRAM_TAP1 << 1))
- bc->modem.par96.scram ^=
- (PAR96_SCRAM_TAPN << 1);
- if (bc->modem.par96.scram & (PAR96_SCRAM_TAP1 << 2))
- val |= PAR96_TXBIT;
- outb(val, LPT_DATA(dev));
- outb(val | PAR96_BURST, LPT_DATA(dev));
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-static __inline__ void par96_rx(struct device *dev, struct baycom_state *bc)
-{
- int i;
- unsigned int data, mask, mask2, descx;
-
- /*
- * do receiver; differential decode and descramble on the fly
- */
- for(data = i = 0; i < PAR96_BURSTBITS; i++) {
- bc->modem.par96.descram = (bc->modem.par96.descram << 1);
- if (inb(LPT_STATUS(dev)) & PAR96_RXBIT)
- bc->modem.par96.descram |= 1;
- descx = bc->modem.par96.descram ^
- (bc->modem.par96.descram >> 1);
- /* now the diff decoded data is inverted in descram */
- outb(PAR97_POWER | PAR96_PTT, LPT_DATA(dev));
- descx ^= ((descx >> PAR96_DESCRAM_TAPSH1) ^
- (descx >> PAR96_DESCRAM_TAPSH2));
- data >>= 1;
- if (!(descx & 1))
- data |= 0x8000;
- outb(PAR97_POWER | PAR96_PTT | PAR96_BURST, LPT_DATA(dev));
- }
- hdlcdrv_putbits(&bc->hdrv, data);
- /*
- * do DCD algorithm
- */
- if (bc->options & BAYCOM_OPTIONS_SOFTDCD) {
- bc->modem.par96.dcd_shreg = (bc->modem.par96.dcd_shreg >> 16)
- | (data << 16);
- /* search for flags and set the dcd counter appropriately */
- for(mask = 0x1fe00, mask2 = 0xfc00, i = 0;
- i < PAR96_BURSTBITS; i++, mask <<= 1, mask2 <<= 1)
- if ((bc->modem.par96.dcd_shreg & mask) == mask2)
- bc->modem.par96.dcd_count = HDLCDRV_MAXFLEN+4;
- /* check for abort/noise sequences */
- for(mask = 0x1fe00, mask2 = 0x1fe00, i = 0;
- i < PAR96_BURSTBITS; i++, mask <<= 1, mask2 <<= 1)
- if (((bc->modem.par96.dcd_shreg & mask) == mask2) &&
- (bc->modem.par96.dcd_count >= 0))
- bc->modem.par96.dcd_count -= HDLCDRV_MAXFLEN-10;
- /* decrement and set the dcd variable */
- if (bc->modem.par96.dcd_count >= 0)
- bc->modem.par96.dcd_count -= 2;
- hdlcdrv_setdcd(&bc->hdrv, bc->modem.par96.dcd_count > 0);
- } else {
- hdlcdrv_setdcd(&bc->hdrv, !!(inb(LPT_STATUS(dev)) & PAR96_DCD));
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-static void par96_interrupt(int irq, void *dev_id, struct pt_regs *regs)
-{
- struct parport *pp = (struct parport *)dev_id;
- struct pardevice *pd = pp->cad;
- struct device *dev = (struct device *)pd->private;
- struct baycom_state *bc = (struct baycom_state *)dev->priv;
-
- if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
- return;
-
- baycom_int_freq(bc);
- /*
- * check if transmitter active
- */
- if (hdlcdrv_ptt(&bc->hdrv))
- par96_tx(dev, bc);
- else {
- par96_rx(dev, bc);
- if (--bc->modem.arb_divider <= 0) {
- bc->modem.arb_divider = 6;
- sti();
- hdlcdrv_arbitrate(dev, &bc->hdrv);
- }
- }
- sti();
- hdlcdrv_transmitter(dev, &bc->hdrv);
- hdlcdrv_receiver(dev, &bc->hdrv);
-}
-
-/* --------------------------------------------------------------------- */
-
-static int par96_preempt(void *handle)
-{
- /* we cannot relinquish the port in the middle of an operation */
- return 1;
-}
-
-/* --------------------------------------------------------------------- */
-
-static void par96_wakeup(void *handle)
-{
- struct device *dev = (struct device *)handle;
- struct baycom_state *bc = (struct baycom_state *)dev->priv;
-
- printk(KERN_DEBUG "baycom_par: %s: why am I being woken up?\n", dev->name);
- if (!parport_claim(bc->pdev))
- printk(KERN_DEBUG "baycom_par: %s: I'm broken.\n", dev->name);
-}
-
-/* --------------------------------------------------------------------- */
-
-static int par96_open(struct device *dev)
-{
- struct baycom_state *bc = (struct baycom_state *)dev->priv;
- struct parport *pp = parport_enumerate();
-
- if (!dev || !bc)
- return -ENXIO;
- while (pp && pp->base != dev->base_addr)
- pp = pp->next;
- if (!pp) {
- printk(KERN_ERR "baycom_par: parport at 0x%lx unknown\n", dev->base_addr);
- return -ENXIO;
- }
- if (pp->irq < 0) {
- printk(KERN_ERR "baycom_par: parport at 0x%x has no irq\n", pp->base);
- return -ENXIO;
- }
- memset(&bc->modem, 0, sizeof(bc->modem));
- bc->hdrv.par.bitrate = 9600;
- if (!(bc->pdev = parport_register_device(pp, dev->name, par96_preempt, par96_wakeup,
- par96_interrupt, PARPORT_DEV_LURK, dev))) {
- printk(KERN_ERR "baycom_par: cannot register parport at 0x%x\n", pp->base);
- return -ENXIO;
- }
- if (parport_claim(bc->pdev)) {
- printk(KERN_ERR "baycom_par: parport at 0x%x busy\n", pp->base);
- parport_unregister_device(bc->pdev);
- return -EBUSY;
- }
- dev->irq = pp->irq;
- /* bc->pdev->port->ops->change_mode(bc->pdev->port, PARPORT_MODE_PCSPP); not yet implemented */
- /* switch off PTT */
- outb(PAR96_PTT | PAR97_POWER, LPT_DATA(dev));
- /*bc->pdev->port->ops->enable_irq(bc->pdev->port); not yet implemented */
- outb(LPT_IRQ_ENABLE, LPT_CONTROL(dev));
- printk(KERN_INFO "%s: par96 at iobase 0x%lx irq %u options 0x%x\n",
- bc_drvname, dev->base_addr, dev->irq, bc->options);
- MOD_INC_USE_COUNT;
- return 0;
-}
-
-/* --------------------------------------------------------------------- */
-
-static int par96_close(struct device *dev)
-{
- struct baycom_state *bc = (struct baycom_state *)dev->priv;
-
- if (!dev || !bc)
- return -EINVAL;
- /* disable interrupt */
- outb(0, LPT_CONTROL(dev));
- /*bc->pdev->port->ops->disable_irq(bc->pdev->port); not yet implemented */
- /* switch off PTT */
- outb(PAR96_PTT | PAR97_POWER, LPT_DATA(dev));
- parport_release(bc->pdev);
- parport_unregister_device(bc->pdev);
- printk(KERN_INFO "%s: close par96 at iobase 0x%lx irq %u\n",
- bc_drvname, dev->base_addr, dev->irq);
- MOD_DEC_USE_COUNT;
- return 0;
-}
-
-/* --------------------------------------------------------------------- */
-/*
- * ===================== hdlcdrv driver interface =========================
- */
-
-static int baycom_ioctl(struct device *dev, struct ifreq *ifr,
- struct hdlcdrv_ioctl *hi, int cmd);
-
-/* --------------------------------------------------------------------- */
-
-static struct hdlcdrv_ops par96_ops = {
- bc_drvname,
- bc_drvinfo,
- par96_open,
- par96_close,
- baycom_ioctl
-};
-
-/* --------------------------------------------------------------------- */
-
-static int baycom_setmode(struct baycom_state *bc, const char *modestr)
-{
- if (!strncmp(modestr, "picpar", 6))
- bc->options = 0;
- else if (!strncmp(modestr, "par96", 5))
- bc->options = BAYCOM_OPTIONS_SOFTDCD;
- else
- bc->options = !!strchr(modestr, '*');
- return 0;
-}
-
-/* --------------------------------------------------------------------- */
-
-static int baycom_ioctl(struct device *dev, struct ifreq *ifr,
- struct hdlcdrv_ioctl *hi, int cmd)
-{
- struct baycom_state *bc;
- struct baycom_ioctl bi;
- int cmd2;
-
- if (!dev || !dev->priv ||
- ((struct baycom_state *)dev->priv)->hdrv.magic != HDLCDRV_MAGIC) {
- printk(KERN_ERR "bc_ioctl: invalid device struct\n");
- return -EINVAL;
- }
- bc = (struct baycom_state *)dev->priv;
-
- if (cmd != SIOCDEVPRIVATE)
- return -ENOIOCTLCMD;
- if (get_user(cmd2, (int *)ifr->ifr_data))
- return -EFAULT;
- switch (hi->cmd) {
- default:
- break;
-
- case HDLCDRVCTL_GETMODE:
- strcpy(hi->data.modename, bc->options ? "par96" : "picpar");
- if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
- return -EFAULT;
- return 0;
-
- case HDLCDRVCTL_SETMODE:
- if (!suser() || dev->start)
- return -EACCES;
- hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
- return baycom_setmode(bc, hi->data.modename);
-
- case HDLCDRVCTL_MODELIST:
- strcpy(hi->data.modename, "par96,picpar");
- if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
- return -EFAULT;
- return 0;
-
- case HDLCDRVCTL_MODEMPARMASK:
- return HDLCDRV_PARMASK_IOBASE;
-
- }
-
- if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
- return -EFAULT;
- switch (bi.cmd) {
- default:
- return -ENOIOCTLCMD;
-
-#ifdef BAYCOM_DEBUG
- case BAYCOMCTL_GETDEBUG:
- bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
- bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
- bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
- break;
-#endif /* BAYCOM_DEBUG */
-
- }
- if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
- return -EFAULT;
- return 0;
-
-}
-
-/* --------------------------------------------------------------------- */
-
-__initfunc(int baycom_par_init(void))
-{
- int i, j, found = 0;
- char set_hw = 1;
- struct baycom_state *bc;
- char ifname[HDLCDRV_IFNAMELEN];
-
-
- printk(bc_drvinfo);
- /*
- * register net devices
- */
- for (i = 0; i < NR_PORTS; i++) {
- struct device *dev = baycom_device+i;
- sprintf(ifname, "bcp%d", i);
-
- if (!baycom_ports[i].mode)
- set_hw = 0;
- if (!set_hw)
- baycom_ports[i].iobase = 0;
- j = hdlcdrv_register_hdlcdrv(dev, &par96_ops,
- sizeof(struct baycom_state),
- ifname, baycom_ports[i].iobase, 0, 0);
- if (!j) {
- bc = (struct baycom_state *)dev->priv;
- if (set_hw && baycom_setmode(bc, baycom_ports[i].mode))
- set_hw = 0;
- found++;
- } else {
- printk(KERN_WARNING "%s: cannot register net device\n",
- bc_drvname);
- }
- }
- if (!found)
- return -ENXIO;
- return 0;
-}
-
-/* --------------------------------------------------------------------- */
-
-#ifdef MODULE
-
-/*
- * command line settable parameters
- */
-static const char *mode[NR_PORTS] = { "picpar", };
-static int iobase[NR_PORTS] = { 0x378, };
-
-#if LINUX_VERSION_CODE >= 0x20115
-
-MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
-MODULE_PARM_DESC(mode, "baycom operating mode; eg. par96 or picpar");
-MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i");
-MODULE_PARM_DESC(iobase, "baycom io base address");
-
-MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
-MODULE_DESCRIPTION("Baycom par96 and picpar amateur radio modem driver");
-
-#endif
-
-__initfunc(int init_module(void))
-{
- int i;
-
- for (i = 0; (i < NR_PORTS) && (mode[i]); i++) {
- baycom_ports[i].mode = mode[i];
- baycom_ports[i].iobase = iobase[i];
- }
- if (i < NR_PORTS-1)
- baycom_ports[i+1].mode = NULL;
- return baycom_par_init();
-}
-
-/* --------------------------------------------------------------------- */
-
-void cleanup_module(void)
-{
- int i;
-
- for(i = 0; i < NR_PORTS; i++) {
- struct device *dev = baycom_device+i;
- struct baycom_state *bc = (struct baycom_state *)dev->priv;
-
- if (bc) {
- if (bc->hdrv.magic != HDLCDRV_MAGIC)
- printk(KERN_ERR "baycom: invalid magic in "
- "cleanup_module\n");
- else
- hdlcdrv_unregister_hdlcdrv(dev);
- }
- }
-}
-
-#else /* MODULE */
-/* --------------------------------------------------------------------- */
-/*
- * format: baycom_par=io,mode
- * mode: par96,picpar
- */
-
-__initfunc(void baycom_par_setup(char *str, int *ints))
-{
- int i;
-
- for (i = 0; (i < NR_PORTS) && (baycom_ports[i].mode); i++);
- if ((i >= NR_PORTS) || (ints[0] < 1)) {
- printk(KERN_INFO "%s: too many or invalid interface "
- "specifications\n", bc_drvname);
- return;
- }
- baycom_ports[i].mode = str;
- baycom_ports[i].iobase = ints[1];
- if (i < NR_PORTS-1)
- baycom_ports[i+1].mode = NULL;
-}
-
-#endif /* MODULE */
-/* --------------------------------------------------------------------- */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov