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/*****************************************************************************/
/*
* baycom_epp.c -- baycom epp radio modem driver.
*
* Copyright (C) 1998-2000
* 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:
* 0.1 xx.xx.1998 Initial version by Matthias Welwarsky (dg2fef)
* 0.2 21.04.1998 Massive rework by Thomas Sailer
* Integrated FPGA EPP modem configuration routines
* 0.3 11.05.1998 Took FPGA config out and moved it into a separate program
* 0.4 26.07.1999 Adapted to new lowlevel parport driver interface
* 0.5 03.08.1999 adapt to Linus' new __setup/__initcall
* removed some pre-2.2 kernel compatibility cruft
* 0.6 10.08.1999 Check if parport can do SPP and is safe to access during interrupt contexts
* 0.7 12.02.2000 adapted to softnet driver interface
*
*/
/*****************************************************************************/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/tqueue.h>
#include <linux/fs.h>
#include <linux/parport.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <linux/if_arp.h>
#include <linux/kmod.h>
#include <linux/hdlcdrv.h>
#include <linux/baycom.h>
#include <linux/soundmodem.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 */
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
/* --------------------------------------------------------------------- */
#define BAYCOM_DEBUG
#define BAYCOM_MAGIC 19730510
/* --------------------------------------------------------------------- */
static const char paranoia_str[] = KERN_ERR
"baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
#define baycom_paranoia_check(dev,routine,retval) \
({ \
if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \
printk(paranoia_str, routine); \
return retval; \
} \
})
#define baycom_paranoia_check_void(dev,routine) \
({ \
if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \
printk(paranoia_str, routine); \
return; \
} \
})
/* --------------------------------------------------------------------- */
static const char bc_drvname[] = "baycom_epp";
static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
/* --------------------------------------------------------------------- */
#define NR_PORTS 4
static struct net_device baycom_device[NR_PORTS];
/* --------------------------------------------------------------------- */
/* EPP status register */
#define EPP_DCDBIT 0x80
#define EPP_PTTBIT 0x08
#define EPP_NREF 0x01
#define EPP_NRAEF 0x02
#define EPP_NRHF 0x04
#define EPP_NTHF 0x20
#define EPP_NTAEF 0x10
#define EPP_NTEF EPP_PTTBIT
/* EPP control register */
#define EPP_TX_FIFO_ENABLE 0x10
#define EPP_RX_FIFO_ENABLE 0x08
#define EPP_MODEM_ENABLE 0x20
#define EPP_LEDS 0xC0
#define EPP_IRQ_ENABLE 0x10
/* LPT registers */
#define LPTREG_ECONTROL 0x402
#define LPTREG_CONFIGB 0x401
#define LPTREG_CONFIGA 0x400
#define LPTREG_EPPDATA 0x004
#define LPTREG_EPPADDR 0x003
#define LPTREG_CONTROL 0x002
#define LPTREG_STATUS 0x001
#define LPTREG_DATA 0x000
/* LPT control register */
#define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */
#define LPTCTRL_WRITE 0x01
#define LPTCTRL_ADDRSTB 0x08
#define LPTCTRL_DATASTB 0x02
#define LPTCTRL_INTEN 0x10
/* LPT status register */
#define LPTSTAT_SHIFT_NINTR 6
#define LPTSTAT_WAIT 0x80
#define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)
#define LPTSTAT_PE 0x20
#define LPTSTAT_DONE 0x10
#define LPTSTAT_NERROR 0x08
#define LPTSTAT_EPPTIMEOUT 0x01
/* LPT data register */
#define LPTDATA_SHIFT_TDI 0
#define LPTDATA_SHIFT_TMS 2
#define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)
#define LPTDATA_TCK 0x02
#define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)
#define LPTDATA_INITBIAS 0x80
/* EPP modem config/status bits */
#define EPP_DCDBIT 0x80
#define EPP_PTTBIT 0x08
#define EPP_RXEBIT 0x01
#define EPP_RXAEBIT 0x02
#define EPP_RXHFULL 0x04
#define EPP_NTHF 0x20
#define EPP_NTAEF 0x10
#define EPP_NTEF EPP_PTTBIT
#define EPP_TX_FIFO_ENABLE 0x10
#define EPP_RX_FIFO_ENABLE 0x08
#define EPP_MODEM_ENABLE 0x20
#define EPP_LEDS 0xC0
#define EPP_IRQ_ENABLE 0x10
/* Xilinx 4k JTAG instructions */
#define XC4K_IRLENGTH 3
#define XC4K_EXTEST 0
#define XC4K_PRELOAD 1
#define XC4K_CONFIGURE 5
#define XC4K_BYPASS 7
#define EPP_CONVENTIONAL 0
#define EPP_FPGA 1
#define EPP_FPGAEXTSTATUS 2
#define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)
/* ---------------------------------------------------------------------- */
/*
* Information that need to be kept for each board.
*/
struct baycom_state {
int magic;
struct pardevice *pdev;
unsigned int bh_running;
struct tq_struct run_bh;
unsigned int modem;
unsigned int bitrate;
unsigned char stat;
struct {
unsigned int intclk;
unsigned int fclk;
unsigned int bps;
unsigned int extmodem;
unsigned int loopback;
} cfg;
struct hdlcdrv_channel_params ch_params;
struct {
unsigned int bitbuf, bitstream, numbits, state;
unsigned char *bufptr;
int bufcnt;
unsigned char buf[TXBUFFER_SIZE];
} hdlcrx;
struct {
int calibrate;
int slotcnt;
int flags;
enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
unsigned char *bufptr;
int bufcnt;
unsigned char buf[TXBUFFER_SIZE];
} hdlctx;
struct net_device_stats stats;
unsigned int ptt_keyed;
struct sk_buff *skb; /* next transmit packet */
#ifdef BAYCOM_DEBUG
struct debug_vals {
unsigned long last_jiffies;
unsigned cur_intcnt;
unsigned last_intcnt;
int cur_pllcorr;
int last_pllcorr;
unsigned int mod_cycles;
unsigned int demod_cycles;
} debug_vals;
#endif /* BAYCOM_DEBUG */
};
/* --------------------------------------------------------------------- */
#define KISS_VERBOSE
/* --------------------------------------------------------------------- */
#define PARAM_TXDELAY 1
#define PARAM_PERSIST 2
#define PARAM_SLOTTIME 3
#define PARAM_TXTAIL 4
#define PARAM_FULLDUP 5
#define PARAM_HARDWARE 6
#define PARAM_RETURN 255
/* --------------------------------------------------------------------- */
/*
* the CRC routines are stolen from WAMPES
* by Dieter Deyke
*/
static const unsigned short crc_ccitt_table[] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
/*---------------------------------------------------------------------------*/
#if 0
extern inline void append_crc_ccitt(unsigned char *buffer, int len)
{
unsigned int crc = 0xffff;
for (;len>0;len--)
crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
crc ^= 0xffff;
*buffer++ = crc;
*buffer++ = crc >> 8;
}
#endif
/*---------------------------------------------------------------------------*/
extern inline int check_crc_ccitt(const unsigned char *buf, int cnt)
{
unsigned int crc = 0xffff;
for (; cnt > 0; cnt--)
crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
return (crc & 0xffff) == 0xf0b8;
}
/*---------------------------------------------------------------------------*/
extern inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
{
unsigned int crc = 0xffff;
for (; cnt > 0; cnt--)
crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
crc ^= 0xffff;
return (crc & 0xffff);
}
/* ---------------------------------------------------------------------- */
#define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
/* --------------------------------------------------------------------- */
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 */
}
/* ---------------------------------------------------------------------- */
/*
* eppconfig_path should be setable via /proc/sys.
*/
static char eppconfig_path[256] = "/usr/sbin/eppfpga";
static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
static int errno;
static int exec_eppfpga(void *b)
{
struct baycom_state *bc = (struct baycom_state *)b;
char modearg[256];
char portarg[16];
char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg, NULL};
int i;
/* set up arguments */
sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
bc->cfg.intclk ? "int" : "ext",
bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
(bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
bc->cfg.loopback ? ",loopback" : "");
sprintf(portarg, "%ld", bc->pdev->port->base);
printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
i = exec_usermodehelper(eppconfig_path, argv, envp);
if (i < 0) {
printk(KERN_ERR "%s: failed to exec %s -s -p %s -m %s, errno = %d\n",
bc_drvname, eppconfig_path, portarg, modearg, i);
return i;
}
return 0;
}
/* eppconfig: called during ifconfig up to configure the modem */
static int eppconfig(struct baycom_state *bc)
{
int i, pid, r;
mm_segment_t fs;
pid = kernel_thread(exec_eppfpga, bc, CLONE_FS);
if (pid < 0) {
printk(KERN_ERR "%s: fork failed, errno %d\n", bc_drvname, -pid);
return pid;
}
fs = get_fs();
set_fs(KERNEL_DS); /* Allow i to be in kernel space. */
r = waitpid(pid, &i, __WCLONE);
set_fs(fs);
if (r != pid) {
printk(KERN_ERR "%s: waitpid(%d) failed, returning %d\n",
bc_drvname, pid, r);
return -1;
}
printk(KERN_DEBUG "%s: eppfpga returned %d\n", bc_drvname, i);
return i;
}
/* ---------------------------------------------------------------------- */
static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
}
/* ---------------------------------------------------------------------- */
static void inline do_kiss_params(struct baycom_state *bc,
unsigned char *data, unsigned long len)
{
#ifdef KISS_VERBOSE
#define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
#else /* KISS_VERBOSE */
#define PKP(a,b)
#endif /* KISS_VERBOSE */
if (len < 2)
return;
switch(data[0]) {
case PARAM_TXDELAY:
bc->ch_params.tx_delay = data[1];
PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
break;
case PARAM_PERSIST:
bc->ch_params.ppersist = data[1];
PKP("p persistence = %u", bc->ch_params.ppersist);
break;
case PARAM_SLOTTIME:
bc->ch_params.slottime = data[1];
PKP("slot time = %ums", bc->ch_params.slottime);
break;
case PARAM_TXTAIL:
bc->ch_params.tx_tail = data[1];
PKP("TX tail = %ums", bc->ch_params.tx_tail);
break;
case PARAM_FULLDUP:
bc->ch_params.fulldup = !!data[1];
PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
break;
default:
break;
}
#undef PKP
}
/* --------------------------------------------------------------------- */
/*
* high performance HDLC encoder
* yes, it's ugly, but generates pretty good code
*/
#define ENCODEITERA(j) \
({ \
if (!(notbitstream & (0x1f0 << j))) \
goto stuff##j; \
encodeend##j: \
})
#define ENCODEITERB(j) \
({ \
stuff##j: \
bitstream &= ~(0x100 << j); \
bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | \
((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); \
numbit++; \
notbitstream = ~bitstream; \
goto encodeend##j; \
})
static void encode_hdlc(struct baycom_state *bc)
{
struct sk_buff *skb;
unsigned char *wp, *bp;
int pkt_len;
unsigned bitstream, notbitstream, bitbuf, numbit, crc;
unsigned char crcarr[2];
if (bc->hdlctx.bufcnt > 0)
return;
skb = bc->skb;
if (!skb)
return;
bc->skb = NULL;
pkt_len = skb->len-1; /* strip KISS byte */
wp = bc->hdlctx.buf;
bp = skb->data+1;
crc = calc_crc_ccitt(bp, pkt_len);
crcarr[0] = crc;
crcarr[1] = crc >> 8;
*wp++ = 0x7e;
bitstream = bitbuf = numbit = 0;
while (pkt_len > -2) {
bitstream >>= 8;
bitstream |= ((unsigned int)*bp) << 8;
bitbuf |= ((unsigned int)*bp) << numbit;
notbitstream = ~bitstream;
bp++;
pkt_len--;
if (!pkt_len)
bp = crcarr;
ENCODEITERA(0);
ENCODEITERA(1);
ENCODEITERA(2);
ENCODEITERA(3);
ENCODEITERA(4);
ENCODEITERA(5);
ENCODEITERA(6);
ENCODEITERA(7);
goto enditer;
ENCODEITERB(0);
ENCODEITERB(1);
ENCODEITERB(2);
ENCODEITERB(3);
ENCODEITERB(4);
ENCODEITERB(5);
ENCODEITERB(6);
ENCODEITERB(7);
enditer:
numbit += 8;
while (numbit >= 8) {
*wp++ = bitbuf;
bitbuf >>= 8;
numbit -= 8;
}
}
bitbuf |= 0x7e7e << numbit;
numbit += 16;
while (numbit >= 8) {
*wp++ = bitbuf;
bitbuf >>= 8;
numbit -= 8;
}
bc->hdlctx.bufptr = bc->hdlctx.buf;
bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
dev_kfree_skb(skb);
bc->stats.tx_packets++;
}
/* ---------------------------------------------------------------------- */
static unsigned short random_seed;
static inline unsigned short random_num(void)
{
random_seed = 28629 * random_seed + 157;
return random_seed;
}
/* ---------------------------------------------------------------------- */
static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
{
struct parport *pp = bc->pdev->port;
unsigned char tmp[128];
int i, j;
if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
bc->hdlctx.state = tx_idle;
if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
if (bc->hdlctx.bufcnt <= 0)
encode_hdlc(bc);
if (bc->hdlctx.bufcnt <= 0)
return 0;
if (!bc->ch_params.fulldup) {
if (!(stat & EPP_DCDBIT)) {
bc->hdlctx.slotcnt = bc->ch_params.slottime;
return 0;
}
if ((--bc->hdlctx.slotcnt) > 0)
return 0;
bc->hdlctx.slotcnt = bc->ch_params.slottime;
if ((random_num() % 256) > bc->ch_params.ppersist)
return 0;
}
}
if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
bc->hdlctx.state = tx_keyup;
bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
bc->ptt_keyed++;
}
while (cnt > 0) {
switch (bc->hdlctx.state) {
case tx_keyup:
i = min_t(int, cnt, bc->hdlctx.flags);
cnt -= i;
bc->hdlctx.flags -= i;
if (bc->hdlctx.flags <= 0)
bc->hdlctx.state = tx_data;
memset(tmp, 0x7e, sizeof(tmp));
while (i > 0) {
j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
return -1;
i -= j;
}
break;
case tx_data:
if (bc->hdlctx.bufcnt <= 0) {
encode_hdlc(bc);
if (bc->hdlctx.bufcnt <= 0) {
bc->hdlctx.state = tx_tail;
bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
break;
}
}
i = min_t(int, cnt, bc->hdlctx.bufcnt);
bc->hdlctx.bufcnt -= i;
cnt -= i;
if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
return -1;
bc->hdlctx.bufptr += i;
break;
case tx_tail:
encode_hdlc(bc);
if (bc->hdlctx.bufcnt > 0) {
bc->hdlctx.state = tx_data;
break;
}
i = min_t(int, cnt, bc->hdlctx.flags);
if (i) {
cnt -= i;
bc->hdlctx.flags -= i;
memset(tmp, 0x7e, sizeof(tmp));
while (i > 0) {
j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
return -1;
i -= j;
}
break;
}
default: /* fall through */
if (bc->hdlctx.calibrate <= 0)
return 0;
i = min_t(int, cnt, bc->hdlctx.calibrate);
cnt -= i;
bc->hdlctx.calibrate -= i;
memset(tmp, 0, sizeof(tmp));
while (i > 0) {
j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
return -1;
i -= j;
}
break;
}
}
return 0;
}
/* ---------------------------------------------------------------------- */
static void do_rxpacket(struct net_device *dev)
{
struct baycom_state *bc = (struct baycom_state *)dev->priv;
struct sk_buff *skb;
unsigned char *cp;
unsigned pktlen;
if (bc->hdlcrx.bufcnt < 4)
return;
if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
return;
pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
if (!(skb = dev_alloc_skb(pktlen))) {
printk("%s: memory squeeze, dropping packet\n", dev->name);
bc->stats.rx_dropped++;
return;
}
skb->dev = dev;
cp = skb_put(skb, pktlen);
*cp++ = 0; /* KISS kludge */
memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
skb->protocol = htons(ETH_P_AX25);
skb->mac.raw = skb->data;
netif_rx(skb);
bc->stats.rx_packets++;
}
#define DECODEITERA(j) \
({ \
if (!(notbitstream & (0x0fc << j))) /* flag or abort */ \
goto flgabrt##j; \
if ((bitstream & (0x1f8 << j)) == (0xf8 << j)) /* stuffed bit */ \
goto stuff##j; \
enditer##j: \
})
#define DECODEITERB(j) \
({ \
flgabrt##j: \
if (!(notbitstream & (0x1fc << j))) { /* abort received */ \
state = 0; \
goto enditer##j; \
} \
if ((bitstream & (0x1fe << j)) != (0x0fc << j)) /* flag received */ \
goto enditer##j; \
if (state) \
do_rxpacket(dev); \
bc->hdlcrx.bufcnt = 0; \
bc->hdlcrx.bufptr = bc->hdlcrx.buf; \
state = 1; \
numbits = 7-j; \
goto enditer##j; \
stuff##j: \
numbits--; \
bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); \
goto enditer##j; \
})
static int receive(struct net_device *dev, int cnt)
{
struct baycom_state *bc = (struct baycom_state *)dev->priv;
struct parport *pp = bc->pdev->port;
unsigned int bitbuf, notbitstream, bitstream, numbits, state;
unsigned char tmp[128];
unsigned char *cp;
int cnt2, ret = 0;
numbits = bc->hdlcrx.numbits;
state = bc->hdlcrx.state;
bitstream = bc->hdlcrx.bitstream;
bitbuf = bc->hdlcrx.bitbuf;
while (cnt > 0) {
cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
cnt -= cnt2;
if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
ret = -1;
break;
}
cp = tmp;
for (; cnt2 > 0; cnt2--, cp++) {
bitstream >>= 8;
bitstream |= (*cp) << 8;
bitbuf >>= 8;
bitbuf |= (*cp) << 8;
numbits += 8;
notbitstream = ~bitstream;
DECODEITERA(0);
DECODEITERA(1);
DECODEITERA(2);
DECODEITERA(3);
DECODEITERA(4);
DECODEITERA(5);
DECODEITERA(6);
DECODEITERA(7);
goto enddec;
DECODEITERB(0);
DECODEITERB(1);
DECODEITERB(2);
DECODEITERB(3);
DECODEITERB(4);
DECODEITERB(5);
DECODEITERB(6);
DECODEITERB(7);
enddec:
while (state && numbits >= 8) {
if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
state = 0;
} else {
*(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
bc->hdlcrx.bufcnt++;
numbits -= 8;
}
}
}
}
bc->hdlcrx.numbits = numbits;
bc->hdlcrx.state = state;
bc->hdlcrx.bitstream = bitstream;
bc->hdlcrx.bitbuf = bitbuf;
return ret;
}
/* --------------------------------------------------------------------- */
#ifdef __i386__
#define GETTICK(x) \
({ \
if (cpu_has_tsc) \
__asm__ __volatile__("rdtsc" : "=a" (x) : : "dx");\
})
#else /* __i386__ */
#define GETTICK(x)
#endif /* __i386__ */
static void epp_bh(struct net_device *dev)
{
struct baycom_state *bc;
struct parport *pp;
unsigned char stat;
unsigned char tmp[2];
unsigned int time1 = 0, time2 = 0, time3 = 0;
int cnt, cnt2;
baycom_paranoia_check_void(dev, "epp_bh");
bc = (struct baycom_state *)dev->priv;
if (!bc->bh_running)
return;
baycom_int_freq(bc);
pp = bc->pdev->port;
/* update status */
if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
goto epptimeout;
bc->stat = stat;
bc->debug_vals.last_pllcorr = stat;
GETTICK(time1);
if (bc->modem == EPP_FPGAEXTSTATUS) {
/* get input count */
tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
goto epptimeout;
if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
goto epptimeout;
cnt = tmp[0] | (tmp[1] << 8);
cnt &= 0x7fff;
/* get output count */
tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
goto epptimeout;
if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
goto epptimeout;
cnt2 = tmp[0] | (tmp[1] << 8);
cnt2 = 16384 - (cnt2 & 0x7fff);
/* return to normal */
tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
goto epptimeout;
if (transmit(bc, cnt2, stat))
goto epptimeout;
GETTICK(time2);
if (receive(dev, cnt))
goto epptimeout;
if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
goto epptimeout;
bc->stat = stat;
} else {
/* try to tx */
switch (stat & (EPP_NTAEF|EPP_NTHF)) {
case EPP_NTHF:
cnt = 2048 - 256;
break;
case EPP_NTAEF:
cnt = 2048 - 1793;
break;
case 0:
cnt = 0;
break;
default:
cnt = 2048 - 1025;
break;
}
if (transmit(bc, cnt, stat))
goto epptimeout;
GETTICK(time2);
/* do receiver */
while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
switch (stat & (EPP_NRAEF|EPP_NRHF)) {
case EPP_NRAEF:
cnt = 1025;
break;
case 0:
cnt = 1793;
break;
default:
cnt = 256;
break;
}
if (receive(dev, cnt))
goto epptimeout;
if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
goto epptimeout;
}
cnt = 0;
if (bc->bitrate < 50000)
cnt = 256;
else if (bc->bitrate < 100000)
cnt = 128;
while (cnt > 0 && stat & EPP_NREF) {
if (receive(dev, 1))
goto epptimeout;
cnt--;
if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
goto epptimeout;
}
}
GETTICK(time3);
#ifdef BAYCOM_DEBUG
bc->debug_vals.mod_cycles = time2 - time1;
bc->debug_vals.demod_cycles = time3 - time2;
#endif /* BAYCOM_DEBUG */
queue_task(&bc->run_bh, &tq_timer);
if (!bc->skb)
netif_wake_queue(dev);
return;
epptimeout:
printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
}
/* ---------------------------------------------------------------------- */
/*
* ===================== network driver interface =========================
*/
static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct baycom_state *bc;
baycom_paranoia_check(dev, "baycom_send_packet", 0);
bc = (struct baycom_state *)dev->priv;
if (skb->data[0] != 0) {
do_kiss_params(bc, skb->data, skb->len);
dev_kfree_skb(skb);
return 0;
}
if (bc->skb)
return -1;
/* strip KISS byte */
if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
dev_kfree_skb(skb);
return 0;
}
netif_stop_queue(dev);
bc->skb = skb;
return 0;
}
/* --------------------------------------------------------------------- */
static int baycom_set_mac_address(struct net_device *dev, void *addr)
{
struct sockaddr *sa = (struct sockaddr *)addr;
/* addr is an AX.25 shifted ASCII mac address */
memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
return 0;
}
/* --------------------------------------------------------------------- */
static struct net_device_stats *baycom_get_stats(struct net_device *dev)
{
struct baycom_state *bc;
baycom_paranoia_check(dev, "baycom_get_stats", NULL);
bc = (struct baycom_state *)dev->priv;
/*
* Get the current statistics. This may be called with the
* card open or closed.
*/
return &bc->stats;
}
/* --------------------------------------------------------------------- */
static void epp_wakeup(void *handle)
{
struct net_device *dev = (struct net_device *)handle;
struct baycom_state *bc;
baycom_paranoia_check_void(dev, "epp_wakeup");
bc = (struct baycom_state *)dev->priv;
printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
if (!parport_claim(bc->pdev))
printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
}
/* --------------------------------------------------------------------- */
/*
* Open/initialize the board. This is called (in the current kernel)
* sometime after booting when the 'ifconfig' program is run.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is non-reboot way to recover if something goes wrong.
*/
static int epp_open(struct net_device *dev)
{
struct baycom_state *bc;
struct parport *pp;
const struct tq_struct run_bh = {
routine: (void *)(void *)epp_bh,
data: dev
};
unsigned int i, j;
unsigned char tmp[128];
unsigned char stat;
unsigned long tstart;
baycom_paranoia_check(dev, "epp_open", -ENXIO);
bc = (struct baycom_state *)dev->priv;
pp = parport_enumerate();
while (pp && pp->base != dev->base_addr)
pp = pp->next;
if (!pp) {
printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
return -ENXIO;
}
#if 0
if (pp->irq < 0) {
printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
return -ENXIO;
}
#endif
if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
bc_drvname, pp->base);
return -EIO;
}
memset(&bc->modem, 0, sizeof(bc->modem));
if (!(bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
epp_interrupt, PARPORT_DEV_EXCL, dev))) {
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;
bc->run_bh = run_bh;
bc->bh_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 */
queue_task(&bc->run_bh, &tq_timer);
netif_start_queue(dev);
MOD_INC_USE_COUNT;
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;
struct parport *pp;
unsigned char tmp[1];
baycom_paranoia_check(dev, "epp_close", -EINVAL);
bc = (struct baycom_state *)dev->priv;
pp = bc->pdev->port;
bc->bh_running = 0;
run_task_queue(&tq_timer); /* dequeue bottom half */
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);
MOD_DEC_USE_COUNT;
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;
struct baycom_ioctl bi;
struct hdlcdrv_ioctl hi;
struct sm_ioctl si;
baycom_paranoia_check(dev, "baycom_ioctl", -EINVAL);
bc = (struct baycom_state *)dev->priv;
if (cmd != SIOCDEVPRIVATE)
return -ENOIOCTLCMD;
if (get_user(cmd, (int *)ifr->ifr_data))
return -EFAULT;
#ifdef BAYCOM_DEBUG
if (cmd == BAYCOMCTL_GETDEBUG) {
bi.data.dbg.debug1 = bc->ptt_keyed;
bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
bc->debug_vals.last_intcnt = 0;
if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
return -EFAULT;
return 0;
}
if (cmd == SMCTL_GETDEBUG) {
si.data.dbg.int_rate = bc->debug_vals.last_intcnt;
si.data.dbg.mod_cycles = bc->debug_vals.mod_cycles;
si.data.dbg.demod_cycles = bc->debug_vals.demod_cycles;
si.data.dbg.dma_residue = 0;
bc->debug_vals.mod_cycles = bc->debug_vals.demod_cycles = 0;
bc->debug_vals.last_intcnt = 0;
if (copy_to_user(ifr->ifr_data, &si, sizeof(si)))
return -EFAULT;
return 0;
}
#endif /* BAYCOM_DEBUG */
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 int 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;
if (!dev)
return -ENXIO;
baycom_paranoia_check(dev, "baycom_probe", -ENXIO);
/*
* not a real probe! only initialize data structures
*/
bc = (struct baycom_state *)dev->priv;
/*
* 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;
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
dev->hard_header = ax25_encapsulate;
dev->rebuild_header = ax25_rebuild_header;
#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
dev->hard_header = NULL;
dev->rebuild_header = NULL;
#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
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;
return 0;
}
/* --------------------------------------------------------------------- */
/*
* command line settable parameters
*/
static const char *mode[NR_PORTS] = { "", };
static int iobase[NR_PORTS] = { 0x378, };
MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
MODULE_PARM_DESC(mode, "baycom operating mode");
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 epp amateur radio modem driver");
MODULE_LICENSE("GPL");
/* --------------------------------------------------------------------- */
static int __init init_baycomepp(void)
{
struct net_device *dev;
int i, found = 0;
char set_hw = 1;
struct baycom_state *bc;
printk(bc_drvinfo);
/*
* register net devices
*/
for (i = 0; i < NR_PORTS; i++) {
dev = baycom_device+i;
if (!mode[i])
set_hw = 0;
if (!set_hw)
iobase[i] = 0;
memset(dev, 0, sizeof(struct net_device));
if (!(bc = dev->priv = kmalloc(sizeof(struct baycom_state), GFP_KERNEL)))
return -ENOMEM;
/*
* initialize part of the baycom_state struct
*/
memset(bc, 0, sizeof(struct baycom_state));
bc->magic = BAYCOM_MAGIC;
sprintf(dev->name, "bce%d", i);
bc->cfg.fclk = 19666600;
bc->cfg.bps = 9600;
/*
* initialize part of the device struct
*/
dev->if_port = 0;
dev->init = baycom_probe;
dev->base_addr = iobase[i];
dev->irq = 0;
dev->dma = 0;
if (register_netdev(dev)) {
printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
kfree(dev->priv);
return -ENXIO;
}
if (set_hw && baycom_setmode(bc, mode[i]))
set_hw = 0;
found++;
}
if (!found)
return -ENXIO;
return 0;
}
static void __exit cleanup_baycomepp(void)
{
struct net_device *dev;
struct baycom_state *bc;
int i;
for(i = 0; i < NR_PORTS; i++) {
dev = baycom_device+i;
bc = (struct baycom_state *)dev->priv;
if (bc) {
if (bc->magic == BAYCOM_MAGIC) {
unregister_netdev(dev);
kfree(dev->priv);
} 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 */
/* --------------------------------------------------------------------- */
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