baycom_epp.c

linux-2.6.15.6

        bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup, 
					epp_interrupt, PARPORT_DEV_EXCL, dev);
	parport_put_port(pp);
        if (!bc->pdev) {
                printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
                return -ENXIO;
        }
        if (parport_claim(bc->pdev)) {
                printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
                parport_unregister_device(bc->pdev);
                return -EBUSY;
        }
        dev->irq = /*pp->irq*/ 0;
	INIT_WORK(&bc->run_work, (void *)(void *)epp_bh, dev);
	bc->work_running = 1;
	bc->modem = EPP_CONVENTIONAL;
	if (eppconfig(bc))
		printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
	else
		bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
	parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
	/* reset the modem */
	tmp[0] = 0;
	tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
	if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
		goto epptimeout;
	/* autoprobe baud rate */
	tstart = jiffies;
	i = 0;
	while ((signed)(jiffies-tstart-HZ/3) < 0) {
		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
			goto epptimeout;
		if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
			schedule();
			continue;
		}
		if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
			goto epptimeout;
		if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
			goto epptimeout;
		i += 256;
	}
	for (j = 0; j < 256; j++) {
		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
			goto epptimeout;
		if (!(stat & EPP_NREF))
			break;
		if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
			goto epptimeout;
		i++;
	}
	tstart = jiffies - tstart;
	bc->bitrate = i * (8 * HZ) / tstart;
	j = 1;
	i = bc->bitrate >> 3;
	while (j < 7 && i > 150) {
		j++;
		i >>= 1;
	}
	printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n", 
	       bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
	tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
	if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
		goto epptimeout;
	/*
	 * initialise hdlc variables
	 */
	bc->hdlcrx.state = 0;
	bc->hdlcrx.numbits = 0;
	bc->hdlctx.state = tx_idle;
	bc->hdlctx.bufcnt = 0;
	bc->hdlctx.slotcnt = bc->ch_params.slottime;
	bc->hdlctx.calibrate = 0;
	/* start the bottom half stuff */
	schedule_delayed_work(&bc->run_work, 1);
	netif_start_queue(dev);
	return 0;

 epptimeout:
	printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
	parport_write_control(pp, 0); /* reset the adapter */
        parport_release(bc->pdev);
        parport_unregister_device(bc->pdev);
	return -EIO;
}

/* --------------------------------------------------------------------- */

static int epp_close(struct net_device *dev)
{
	struct baycom_state *bc = netdev_priv(dev);
	struct parport *pp = bc->pdev->port;
	unsigned char tmp[1];

	bc->work_running = 0;
	flush_scheduled_work();
	bc->stat = EPP_DCDBIT;
	tmp[0] = 0;
	pp->ops->epp_write_addr(pp, tmp, 1, 0);
	parport_write_control(pp, 0); /* reset the adapter */
        parport_release(bc->pdev);
        parport_unregister_device(bc->pdev);
	if (bc->skb)
		dev_kfree_skb(bc->skb);
	bc->skb = NULL;
	printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
	       bc_drvname, dev->base_addr, dev->irq);
	return 0;
}

/* --------------------------------------------------------------------- */

static int baycom_setmode(struct baycom_state *bc, const char *modestr)
{
	const char *cp;

	if (strstr(modestr,"intclk"))
		bc->cfg.intclk = 1;
	if (strstr(modestr,"extclk"))
		bc->cfg.intclk = 0;
	if (strstr(modestr,"intmodem"))
		bc->cfg.extmodem = 0;
	if (strstr(modestr,"extmodem"))
		bc->cfg.extmodem = 1;
	if (strstr(modestr,"noloopback"))
		bc->cfg.loopback = 0;
	if (strstr(modestr,"loopback"))
		bc->cfg.loopback = 1;
	if ((cp = strstr(modestr,"fclk="))) {
		bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
		if (bc->cfg.fclk < 1000000)
			bc->cfg.fclk = 1000000;
		if (bc->cfg.fclk > 25000000)
			bc->cfg.fclk = 25000000;
	}
	if ((cp = strstr(modestr,"bps="))) {
		bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
		if (bc->cfg.bps < 1000)
			bc->cfg.bps = 1000;
		if (bc->cfg.bps > 1500000)
			bc->cfg.bps = 1500000;
	}
	return 0;
}

/* --------------------------------------------------------------------- */

static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct baycom_state *bc = netdev_priv(dev);
	struct hdlcdrv_ioctl hi;

	if (cmd != SIOCDEVPRIVATE)
		return -ENOIOCTLCMD;

	if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
		return -EFAULT;
	switch (hi.cmd) {
	default:
		return -ENOIOCTLCMD;

	case HDLCDRVCTL_GETCHANNELPAR:
		hi.data.cp.tx_delay = bc->ch_params.tx_delay;
		hi.data.cp.tx_tail = bc->ch_params.tx_tail;
		hi.data.cp.slottime = bc->ch_params.slottime;
		hi.data.cp.ppersist = bc->ch_params.ppersist;
		hi.data.cp.fulldup = bc->ch_params.fulldup;
		break;

	case HDLCDRVCTL_SETCHANNELPAR:
		if (!capable(CAP_NET_ADMIN))
			return -EACCES;
		bc->ch_params.tx_delay = hi.data.cp.tx_delay;
		bc->ch_params.tx_tail = hi.data.cp.tx_tail;
		bc->ch_params.slottime = hi.data.cp.slottime;
		bc->ch_params.ppersist = hi.data.cp.ppersist;
		bc->ch_params.fulldup = hi.data.cp.fulldup;
		bc->hdlctx.slotcnt = 1;
		return 0;
		
	case HDLCDRVCTL_GETMODEMPAR:
		hi.data.mp.iobase = dev->base_addr;
		hi.data.mp.irq = dev->irq;
		hi.data.mp.dma = dev->dma;
		hi.data.mp.dma2 = 0;
		hi.data.mp.seriobase = 0;
		hi.data.mp.pariobase = 0;
		hi.data.mp.midiiobase = 0;
		break;

	case HDLCDRVCTL_SETMODEMPAR:
		if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
			return -EACCES;
		dev->base_addr = hi.data.mp.iobase;
		dev->irq = /*hi.data.mp.irq*/0;
		dev->dma = /*hi.data.mp.dma*/0;
		return 0;	
		
	case HDLCDRVCTL_GETSTAT:
		hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
		hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
		hi.data.cs.ptt_keyed = bc->ptt_keyed;
		hi.data.cs.tx_packets = bc->stats.tx_packets;
		hi.data.cs.tx_errors = bc->stats.tx_errors;
		hi.data.cs.rx_packets = bc->stats.rx_packets;
		hi.data.cs.rx_errors = bc->stats.rx_errors;
		break;		

	case HDLCDRVCTL_OLDGETSTAT:
		hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
		hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
		hi.data.ocs.ptt_keyed = bc->ptt_keyed;
		break;		

	case HDLCDRVCTL_CALIBRATE:
		if (!capable(CAP_SYS_RAWIO))
			return -EACCES;
		bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
		return 0;

	case HDLCDRVCTL_DRIVERNAME:
		strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
		break;
		
	case HDLCDRVCTL_GETMODE:
		sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s", 
			bc->cfg.intclk ? "int" : "ext",
			bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
			bc->cfg.loopback ? ",loopback" : "");
		break;

	case HDLCDRVCTL_SETMODE:
		if (!capable(CAP_NET_ADMIN) || netif_running(dev))
			return -EACCES;
		hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
		return baycom_setmode(bc, hi.data.modename);

	case HDLCDRVCTL_MODELIST:
		strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
			sizeof(hi.data.modename));
		break;

	case HDLCDRVCTL_MODEMPARMASK:
		return HDLCDRV_PARMASK_IOBASE;

	}
	if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
		return -EFAULT;
	return 0;
}

/* --------------------------------------------------------------------- */

/*
 * Check for a network adaptor of this type, and return '0' if one exists.
 * If dev->base_addr == 0, probe all likely locations.
 * If dev->base_addr == 1, always return failure.
 * If dev->base_addr == 2, allocate space for the device and return success
 * (detachable devices only).
 */
static void baycom_probe(struct net_device *dev)
{
	static char ax25_bcast[AX25_ADDR_LEN] = {
		'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
	};
	static char ax25_nocall[AX25_ADDR_LEN] = {
		'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
	};
	const struct hdlcdrv_channel_params dflt_ch_params = { 
		20, 2, 10, 40, 0 
	};
	struct baycom_state *bc;

	/*
	 * not a real probe! only initialize data structures
	 */
	bc = netdev_priv(dev);
	/*
	 * initialize the baycom_state struct
	 */
	bc->ch_params = dflt_ch_params;
	bc->ptt_keyed = 0;

	/*
	 * initialize the device struct
	 */
	dev->open = epp_open;
	dev->stop = epp_close;
	dev->do_ioctl = baycom_ioctl;
	dev->hard_start_xmit = baycom_send_packet;
	dev->get_stats = baycom_get_stats;

	/* Fill in the fields of the device structure */
	bc->skb = NULL;
	
	dev->hard_header = ax25_hard_header;
	dev->rebuild_header = ax25_rebuild_header;
	dev->set_mac_address = baycom_set_mac_address;
	
	dev->type = ARPHRD_AX25;           /* AF_AX25 device */
	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
	dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
	dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
	memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
	memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
	dev->tx_queue_len = 16;

	/* New style flags */
	dev->flags = 0;
}

/* --------------------------------------------------------------------- */

/*
 * command line settable parameters
 */
static const char *mode[NR_PORTS] = { "", };
static int iobase[NR_PORTS] = { 0x378, };

module_param_array(mode, charp, NULL, 0);
MODULE_PARM_DESC(mode, "baycom operating mode");
module_param_array(iobase, int, NULL, 0);
MODULE_PARM_DESC(iobase, "baycom io base address");

MODULE_AUTHOR("Thomas M. Sailer, [e-mail], [e-mail]");
MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
MODULE_LICENSE("GPL");

/* --------------------------------------------------------------------- */

static void __init baycom_epp_dev_setup(struct net_device *dev)
{
	struct baycom_state *bc = netdev_priv(dev);

	/*
	 * initialize part of the baycom_state struct
	 */
	bc->magic = BAYCOM_MAGIC;
	bc->cfg.fclk = 19666600;
	bc->cfg.bps = 9600;
	/*
	 * initialize part of the device struct
	 */
	baycom_probe(dev);
}

static int __init init_baycomepp(void)
{
	int i, found = 0;
	char set_hw = 1;

	printk(bc_drvinfo);
	/*
	 * register net devices
	 */
	for (i = 0; i < NR_PORTS; i++) {
		struct net_device *dev;
		
		dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
				   baycom_epp_dev_setup);

		if (!dev) {
			printk(KERN_WARNING "bce%d : out of memory\n", i);
			return found ? 0 : -ENOMEM;
		}
			
		sprintf(dev->name, "bce%d", i);
		dev->base_addr = iobase[i];

		if (!mode[i])
			set_hw = 0;
		if (!set_hw)
			iobase[i] = 0;

		if (register_netdev(dev)) {
			printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
			free_netdev(dev);
			break;
		}
		if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
			set_hw = 0;
		baycom_device[i] = dev;
		found++;
	}

	return found ? 0 : -ENXIO;
}

static void __exit cleanup_baycomepp(void)
{
	int i;

	for(i = 0; i < NR_PORTS; i++) {
		struct net_device *dev = baycom_device[i];

		if (dev) {
			struct baycom_state *bc = netdev_priv(dev);
			if (bc->magic == BAYCOM_MAGIC) {
				unregister_netdev(dev);
				free_netdev(dev);
			} else
				printk(paranoia_str, "cleanup_module");
		}
	}
}

module_init(init_baycomepp);
module_exit(cleanup_baycomepp);

/* --------------------------------------------------------------------- */

#ifndef MODULE

/*
 * format: baycom_epp=io,mode
 * mode: fpga config options
 */

static int __init baycom_epp_setup(char *str)
{
        static unsigned __initdata nr_dev = 0;
	int ints[2];

        if (nr_dev >= NR_PORTS)
                return 0;
	str = get_options(str, 2, ints);
	if (ints[0] < 1)
		return 0;
	mode[nr_dev] = str;
	iobase[nr_dev] = ints[1];
	nr_dev++;
	return 1;
}

__setup("baycom_epp=", baycom_epp_setup);

#endif /* MODULE */
/* --------------------------------------------------------------------- */