--- /dev/null
+/*****************************************************************************/
+
+/*
+ * 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/crc-ccitt.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+#include <linux/fs.h>
+#include <linux/parport.h>
+#include <linux/if_arp.h>
+#include <linux/hdlcdrv.h>
+#include <linux/baycom.h>
+#include <linux/jiffies.h>
+#include <linux/random.h>
+#include <net/ax25.h>
+#include <asm/uaccess.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";
+
+static const char bc_drvname[] = "baycom_epp";
+static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
+"baycom_epp: version 0.7\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;
+ struct net_device *dev;
+ unsigned int work_running;
+ struct delayed_work run_work;
+ 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;
+
+ 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
+ */
+
+
+/*---------------------------------------------------------------------------*/
+
+#if 0
+static 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
+
+/*---------------------------------------------------------------------------*/
+
+static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
+{
+ return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
+}
+
+/*---------------------------------------------------------------------------*/
+
+static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
+{
+ return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
+
+/* --------------------------------------------------------------------- */
+
+static inline void 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 (time_after_eq(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 };
+
+/* eppconfig: called during ifconfig up to configure the modem */
+static int eppconfig(struct baycom_state *bc)
+{
+ char modearg[256];
+ char portarg[16];
+ char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
+ NULL };
+
+ /* 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);
+
+ return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline void 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
+}
+
+/* --------------------------------------------------------------------- */
+
+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];
+ int j;
+
+ 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;
+ for (j = 0; j < 8; j++)
+ if (unlikely(!(notbitstream & (0x1f0 << j)))) {
+ bitstream &= ~(0x100 << j);
+ bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
+ ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
+ numbit++;
+ notbitstream = ~bitstream;
+ }
+ 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->dev->stats.tx_packets++;
+}
+
+/* ---------------------------------------------------------------------- */
+
+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 ((prandom_u32() % 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 = netdev_priv(dev);
+ 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);
+ dev->stats.rx_dropped++;
+ return;
+ }
+ cp = skb_put(skb, pktlen);
+ *cp++ = 0; /* KISS kludge */
+ memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
+ skb->protocol = ax25_type_trans(skb, dev);
+ netif_rx(skb);
+ dev->stats.rx_packets++;
+}
+
+static int receive(struct net_device *dev, int cnt)
+{
+ struct baycom_state *bc = netdev_priv(dev);
+ struct parport *pp = bc->pdev->port;
+ unsigned int bitbuf, notbitstream, bitstream, numbits, state;
+ unsigned char tmp[128];
+ unsigned char *cp;
+ int cnt2, ret = 0;
+ int j;
+
+ 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;
+ for (j = 0; j < 8; j++) {
+
+ /* flag or abort */
+ if (unlikely(!(notbitstream & (0x0fc << j)))) {
+
+ /* abort received */
+ if (!(notbitstream & (0x1fc << j)))
+ state = 0;
+
+ /* flag received */
+ else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) {
+ if (state)
+ do_rxpacket(dev);
+ bc->hdlcrx.bufcnt = 0;
+ bc->hdlcrx.bufptr = bc->hdlcrx.buf;
+ state = 1;
+ numbits = 7-j;
+ }
+ }
+
+ /* stuffed bit */
+ else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
+ numbits--;
+ bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
+ }
+ }
+ 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__
+#include <asm/msr.h>
+#define GETTICK(x) \
+({ \
+ if (cpu_has_tsc) \
+ rdtscl(x); \
+})
+#else /* __i386__ */
+#define GETTICK(x)
+#endif /* __i386__ */
+
+static void epp_bh(struct work_struct *work)
+{
+ 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;
+
+ bc = container_of(work, struct baycom_state, run_work.work);
+ dev = bc->dev;
+ if (!bc->work_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 */
+ schedule_delayed_work(&bc->run_work, 1);
+ 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 = netdev_priv(dev);
+
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
+ if (skb->data[0] != 0) {
+ do_kiss_params(bc, skb->data, skb->len);
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ if (bc->skb)
+ return NETDEV_TX_LOCKED;
+ /* strip KISS byte */
+ if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ netif_stop_queue(dev);
+ bc->skb = skb;
+ return NETDEV_TX_OK;
+}
+
+/* --------------------------------------------------------------------- */
+
+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 void epp_wakeup(void *handle)
+{
+ struct net_device *dev = (struct net_device *)handle;
+ struct baycom_state *bc = netdev_priv(dev);
+
+ 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 = netdev_priv(dev);
+ struct parport *pp = parport_find_base(dev->base_addr);
+ unsigned int i, j;
+ unsigned char tmp[128];
+ unsigned char stat;
+ unsigned long tstart;
+
+ 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);
+ parport_put_port(pp);
+ 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);
+ parport_put_port(pp);
+ return -EIO;
+ }
+ memset(&bc->modem, 0, sizeof(bc->modem));
+ bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
+ NULL, 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_DELAYED_WORK(&bc->run_work, epp_bh);
+ 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 (time_before(jiffies, tstart + HZ/3)) {
+ 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;
+ cancel_delayed_work_sync(&bc->run_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 = dev->stats.tx_packets;
+ hi.data.cs.tx_errors = dev->stats.tx_errors;
+ hi.data.cs.rx_packets = dev->stats.rx_packets;
+ hi.data.cs.rx_errors = dev->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;
+}
+
+/* --------------------------------------------------------------------- */
+
+static const struct net_device_ops baycom_netdev_ops = {
+ .ndo_open = epp_open,
+ .ndo_stop = epp_close,
+ .ndo_do_ioctl = baycom_ioctl,
+ .ndo_start_xmit = baycom_send_packet,
+ .ndo_set_mac_address = baycom_set_mac_address,
+};
+
+/*
+ * 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)
+{
+ 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
+ */
+
+ /* Fill in the fields of the device structure */
+ bc->skb = NULL;
+
+ dev->netdev_ops = &baycom_netdev_ops;
+ dev->header_ops = &ax25_header_ops;
+
+ 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, &null_ax25_address, AX25_ADDR_LEN);
+ dev->tx_queue_len = 16;
+
+ /* New style flags */
+ dev->flags = 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * command line settable parameters
+ */
+static 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, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
+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->dev = dev;
+ 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",
+ NET_NAME_UNKNOWN, 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 */
+/* --------------------------------------------------------------------- */
Code Review / kvmfornfv.git / blobdiff