path: root/drivers/net/hamradio/yam.c

/*****************************************************************************/

/*
 *    yam.c  -- YAM radio modem driver.
 *
 *      Copyright (C) 1998 Frederic Rible F1OAT (frible@teaser.fr)
 *      Adapted from baycom.c driver written by Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Please note that the GPL allows you to use the driver, NOT the radio.
 *  In order to use the radio, you need a license from the communications
 *  authority of your country.
 *
 *
 *  History:
 *   0.0 F1OAT 06.06.98  Begin of work with baycom.c source code V 0.3
 *   0.1 F1OAT 07.06.98  Add timer polling routine for channel arbitration
 *   0.2 F6FBB 08.06.98  Added delay after FPGA programming
 *   0.3 F6FBB 29.07.98  Delayed PTT implementation for dupmode=2
 *   0.4 F6FBB 30.07.98  Added TxTail, Slottime and Persistance
 *   0.5 F6FBB 01.08.98  Shared IRQs, /proc/net and network statistics
 *   0.6 F6FBB 25.08.98  Added 1200Bds format
 *   0.7 F6FBB 12.09.98  Added to the kernel configuration
 *   0.8 F6FBB 14.10.98  Fixed slottime/persistence timing bug
 *       OK1ZIA 2.09.01  Fixed "kfree_skb on hard IRQ" 
 *                       using dev_kfree_skb_any(). (important in 2.4 kernel)
 *   
 */

/*****************************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>

#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
/* prototypes for ax25_encapsulate and ax25_rebuild_header */
#include <net/ax25.h>
#endif	/* CONFIG_AX25 || CONFIG_AX25_MODULE */

/* make genksyms happy */
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/tcp.h>

#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>
#include <linux/init.h>

#include <linux/yam.h>
#include "yam9600.h"
#include "yam1200.h"

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

static const char yam_drvname[] = "yam";
static char yam_drvinfo[] __initdata = KERN_INFO "YAM driver version 0.8 by F1OAT/F6FBB\n";

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

#define YAM_9600	1
#define YAM_1200	2

#define NR_PORTS	4
#define YAM_MAGIC	0xF10A7654

/* Transmitter states */

#define TX_OFF		0
#define TX_HEAD		1
#define TX_DATA		2
#define TX_CRC1		3
#define TX_CRC2		4
#define TX_TAIL		5

#define YAM_MAX_FRAME	1024

#define DEFAULT_BITRATE	9600			/* bps */
#define DEFAULT_HOLDD	10			/* sec */
#define DEFAULT_TXD	300			/* ms */
#define DEFAULT_TXTAIL	10			/* ms */
#define DEFAULT_SLOT	100			/* ms */
#define DEFAULT_PERS	64			/* 0->255 */

struct yam_port {
	int magic;
	int bitrate;
	int baudrate;
	int iobase;
	int irq;
	int dupmode;

	struct net_device *dev;

	/* Stats section */

	struct net_device_stats stats;

	int nb_rxint;
	int nb_mdint;

	/* Parameters section */

	int txd;				/* tx delay */
	int holdd;				/* duplex ptt delay */
	int txtail;				/* txtail delay */
	int slot;				/* slottime */
	int pers;				/* persistence */

	/* Tx section */

	int tx_state;
	int tx_count;
	int slotcnt;
	unsigned char tx_buf[YAM_MAX_FRAME];
	int tx_len;
	int tx_crcl, tx_crch;
	struct sk_buff_head send_queue;		/* Packets awaiting transmission */

	/* Rx section */

	int dcd;
	unsigned char rx_buf[YAM_MAX_FRAME];
	int rx_len;
	int rx_crcl, rx_crch;
};

struct yam_mcs {
	unsigned char bits[YAM_FPGA_SIZE];
	int bitrate;
	struct yam_mcs *next;
};

static struct net_device *yam_devs[NR_PORTS];

static struct yam_mcs *yam_data;

static char ax25_bcast[7] =
{'Q' << 1, 'S' <<