1 files changed, 658 insertions, 0 deletions

diff --git a/drivers/isdn/hisax/elsa_ser.c b/drivers/isdn/hisax/elsa_ser.c
new file mode 100644
index 00000000..d4c98d33
--- /dev/null
+++ b/drivers/isdn/hisax/elsa_ser.c
@@ -0,0 +1,658 @@
+/* $Id: elsa_ser.c,v 2.14.2.3 2004/02/11 13:21:33 keil Exp $
+ *
+ * stuff for the serial modem on ELSA cards
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/slab.h>
+
+#define MAX_MODEM_BUF	256
+#define WAKEUP_CHARS	(MAX_MODEM_BUF / 2)
+#define RS_ISR_PASS_LIMIT 256
+#define BASE_BAUD (1843200 / 16)
+
+//#define SERIAL_DEBUG_OPEN 1
+//#define SERIAL_DEBUG_INTR 1
+//#define SERIAL_DEBUG_FLOW 1
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_REG
+//#define SERIAL_DEBUG_REG 1
+
+#ifdef SERIAL_DEBUG_REG
+static u_char deb[32];
+const char *ModemIn[] = {"RBR", "IER", "IIR", "LCR", "MCR", "LSR", "MSR", "SCR"};
+const char *ModemOut[] = {"THR", "IER", "FCR", "LCR", "MCR", "LSR", "MSR", "SCR"};
+#endif
+
+static char *MInit_1 = "AT&F&C1E0&D2\r\0";
+static char *MInit_2 = "ATL2M1S64=13\r\0";
+static char *MInit_3 = "AT+FCLASS=0\r\0";
+static char *MInit_4 = "ATV1S2=128X1\r\0";
+static char *MInit_5 = "AT\\V8\\N3\r\0";
+static char *MInit_6 = "ATL0M0&G0%E1\r\0";
+static char *MInit_7 = "AT%L1%M0%C3\r\0";
+
+static char *MInit_speed28800 = "AT%G0%B28800\r\0";
+
+static char *MInit_dialout = "ATs7=60 x1 d\r\0";
+static char *MInit_dialin = "ATs7=60 x1 a\r\0";
+
+
+static inline unsigned int serial_in(struct IsdnCardState *cs, int offset)
+{
+#ifdef SERIAL_DEBUG_REG
+	u_int val = inb(cs->hw.elsa.base + 8 + offset);
+	debugl1(cs, "in   %s %02x", ModemIn[offset], val);
+	return (val);
+#else
+	return inb(cs->hw.elsa.base + 8 + offset);
+#endif
+}
+
+static inline unsigned int serial_inp(struct IsdnCardState *cs, int offset)
+{
+#ifdef SERIAL_DEBUG_REG
+#ifdef ELSA_SERIAL_NOPAUSE_IO
+	u_int val = inb(cs->hw.elsa.base + 8 + offset);
+	debugl1(cs, "inp  %s %02x", ModemIn[offset], val);
+#else
+	u_int val = inb_p(cs->hw.elsa.base + 8 + offset);
+	debugl1(cs, "inP  %s %02x", ModemIn[offset], val);
+#endif
+	return (val);
+#else
+#ifdef ELSA_SERIAL_NOPAUSE_IO
+	return inb(cs->hw.elsa.base + 8 + offset);
+#else
+	return inb_p(cs->hw.elsa.base + 8 + offset);
+#endif
+#endif
+}
+
+static inline void serial_out(struct IsdnCardState *cs, int offset, int value)
+{
+#ifdef SERIAL_DEBUG_REG
+	debugl1(cs, "out  %s %02x", ModemOut[offset], value);
+#endif
+	outb(value, cs->hw.elsa.base + 8 + offset);
+}
+
+static inline void serial_outp(struct IsdnCardState *cs, int offset,
+			       int value)
+{
+#ifdef SERIAL_DEBUG_REG
+#ifdef ELSA_SERIAL_NOPAUSE_IO
+	debugl1(cs, "outp %s %02x", ModemOut[offset], value);
+#else
+	debugl1(cs, "outP %s %02x", ModemOut[offset], value);
+#endif
+#endif
+#ifdef ELSA_SERIAL_NOPAUSE_IO
+	outb(value, cs->hw.elsa.base + 8 + offset);
+#else
+	outb_p(value, cs->hw.elsa.base + 8 + offset);
+#endif
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct IsdnCardState *cs, int baud)
+{
+	int	quot = 0, baud_base;
+	unsigned cval, fcr = 0;
+
+
+	/* byte size and parity */
+	cval = 0x03;
+	/* Determine divisor based on baud rate */
+	baud_base = BASE_BAUD;
+	quot = baud_base / baud;
+	/* If the quotient is ever zero, default to 9600 bps */
+	if (!quot)
+		quot = baud_base / 9600;
+
+	/* Set up FIFO's */
+	if ((baud_base / quot) < 2400)
+		fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
+	else
+		fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
+	serial_outp(cs, UART_FCR, fcr);
+	/* CTS flow control flag and modem status interrupts */
+	cs->hw.elsa.IER &= ~UART_IER_MSI;
+	cs->hw.elsa.IER |= UART_IER_MSI;
+	serial_outp(cs, UART_IER, cs->hw.elsa.IER);
+
+	debugl1(cs, "modem quot=0x%x", quot);
+	serial_outp(cs, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+	serial_outp(cs, UART_DLL, quot & 0xff);		/* LS of divisor */
+	serial_outp(cs, UART_DLM, quot >> 8);		/* MS of divisor */
+	serial_outp(cs, UART_LCR, cval);		/* reset DLAB */
+	serial_inp(cs, UART_RX);
+}
+
+static int mstartup(struct IsdnCardState *cs)
+{
+	int retval = 0;
+
+	/*
+	 * Clear the FIFO buffers and disable them
+	 * (they will be reenabled in change_speed())
+	 */
+	serial_outp(cs, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT));
+
+	/*
+	 * At this point there's no way the LSR could still be 0xFF;
+	 * if it is, then bail out, because there's likely no UART
+	 * here.
+	 */
+	if (serial_inp(cs, UART_LSR) == 0xff) {
+		retval = -ENODEV;
+		goto errout;
+	}
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+	(void) serial_inp(cs, UART_RX);
+	(void) serial_inp(cs, UART_IIR);
+	(void) serial_inp(cs, UART_MSR);
+
+	/*
+	 * Now, initialize the UART
+	 */
+	serial_outp(cs, UART_LCR, UART_LCR_WLEN8);	/* reset DLAB */
+
+	cs->hw.elsa.MCR = 0;
+	cs->hw.elsa.MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
+	serial_outp(cs, UART_MCR, cs->hw.elsa.MCR);
+
+	/*
+	 * Finally, enable interrupts
+	 */
+	cs->hw.elsa.IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
+	serial_outp(cs, UART_IER, cs->hw.elsa.IER);	/* enable interrupts */
+
+	/*
+	 * And clear the interrupt registers again for luck.
+	 */
+	(void)serial_inp(cs, UART_LSR);
+	(void)serial_inp(cs, UART_RX);
+	(void)serial_inp(cs, UART_IIR);
+	(void)serial_inp(cs, UART_MSR);
+
+	cs->hw.elsa.transcnt = cs->hw.elsa.transp = 0;
+	cs->hw.elsa.rcvcnt = cs->hw.elsa.rcvp = 0;
+
+	/*
+	 * and set the speed of the serial port
+	 */
+	change_speed(cs, BASE_BAUD);
+	cs->hw.elsa.MFlag = 1;
+errout:
+	return retval;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void mshutdown(struct IsdnCardState *cs)
+{
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk(KERN_DEBUG"Shutting down serial ....");
+#endif
+
+	/*
+	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+	 * here so the queue might never be waken up
+	 */
+
+	cs->hw.elsa.IER = 0;
+	serial_outp(cs, UART_IER, 0x00);	/* disable all intrs */
+	cs->hw.elsa.MCR &= ~UART_MCR_OUT2;
+
+	/* disable break condition */
+	serial_outp(cs, UART_LCR, serial_inp(cs, UART_LCR) & ~UART_LCR_SBC);
+
+	cs->hw.elsa.MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
+	serial_outp(cs, UART_MCR, cs->hw.elsa.MCR);
+
+	/* disable FIFO's */
+	serial_outp(cs, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT));
+	serial_inp(cs, UART_RX);    /* read data port to reset things */
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk(" done\n");
+#endif
+}
+
+static inline int
+write_modem(struct BCState *bcs) {
+	int ret = 0;
+	struct IsdnCardState *cs = bcs->cs;
+	int count, len, fp;
+
+	if (!bcs->tx_skb)
+		return 0;
+	if (bcs->tx_skb->len <= 0)
+		return 0;
+	len = bcs->tx_skb->len;
+	if (len > MAX_MODEM_BUF - cs->hw.elsa.transcnt)
+		len = MAX_MODEM_BUF - cs->hw.elsa.transcnt;
+	fp = cs->hw.elsa.transcnt + cs->hw.elsa.transp;
+	fp &= (MAX_MODEM_BUF - 1);
+	count = len;
+	if (count > MAX_MODEM_BUF - fp) {
+		count = MAX_MODEM_BUF - fp;
+		skb_copy_from_linear_data(bcs->tx_skb,
+					  cs->hw.elsa.transbuf + fp, count);
+		skb_pull(bcs->tx_skb, count);
+		cs->hw.elsa.transcnt += count;
+		ret = count;
+		count = len - count;
+		fp = 0;
+	}
+	skb_copy_from_linear_data(bcs->tx_skb,
+				  cs->hw.elsa.transbuf + fp, count);
+	skb_pull(bcs->tx_skb, count);
+	cs->hw.elsa.transcnt += count;
+	ret += count;
+
+	if (cs->hw.elsa.transcnt &&
+	    !(cs->hw.elsa.IER & UART_IER_THRI)) {
+		cs->hw.elsa.IER |= UART_IER_THRI;
+		serial_outp(cs, UART_IER, cs->hw.elsa.IER);
+	}
+	return (ret);
+}
+
+static inline void
+modem_fill(struct BCState *bcs) {
+
+	if (bcs->tx_skb) {
+		if (bcs->tx_skb->len) {
+			write_modem(bcs);
+			return;
+		} else {
+			if (test_bit(FLG_LLI_L1WAKEUP, &bcs->st->lli.flag) &&
+			    (PACKET_NOACK != bcs->tx_skb->pkt_type)) {
+				u_long	flags;
+				spin_lock_irqsave(&bcs->aclock, flags);
+				bcs->ackcnt += bcs->hw.hscx.count;
+				spin_unlock_irqrestore(&bcs->aclock, flags);
+				schedule_event(bcs, B_ACKPENDING);
+			}
+			dev_kfree_skb_any(bcs->tx_skb);
+			bcs->tx_skb = NULL;
+		}
+	}
+	if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
+		bcs->hw.hscx.count = 0;
+		test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
+		write_modem(bcs);
+	} else {
+		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+		schedule_event(bcs, B_XMTBUFREADY);
+	}
+}
+
+static inline void receive_chars(struct IsdnCardState *cs,
+				 int *status)
+{
+	unsigned char ch;
+	struct sk_buff *skb;
+
+	do {
+		ch = serial_in(cs, UART_RX);
+		if (cs->hw.elsa.rcvcnt >= MAX_MODEM_BUF)
+			break;
+		cs->hw.elsa.rcvbuf[cs->hw.elsa.rcvcnt++] = ch;
+#ifdef SERIAL_DEBUG_INTR
+		printk("DR%02x:%02x...", ch, *status);
+#endif
+		if (*status & (UART_LSR_BI | UART_LSR_PE |
+			       UART_LSR_FE | UART_LSR_OE)) {
+
+#ifdef SERIAL_DEBUG_INTR
+			printk("handling exept....");
+#endif
+		}
+		*status = serial_inp(cs, UART_LSR);
+	} while (*status & UART_LSR_DR);
+	if (cs->hw.elsa.MFlag == 2) {
+		if (!(skb = dev_alloc_skb(cs->hw.elsa.rcvcnt)))
+			printk(KERN_WARNING "ElsaSER: receive out of memory\n");
+		else {
+			memcpy(skb_put(skb, cs->hw.elsa.rcvcnt), cs->hw.elsa.rcvbuf,
+			       cs->hw.elsa.rcvcnt);
+			skb_queue_tail(&cs->hw.elsa.bcs->rqueue, skb);
+		}
+		schedule_event(cs->hw.elsa.bcs, B_RCVBUFREADY);
+	} else {
+		char tmp[128];
+		char *t = tmp;
+
+		t += sprintf(t, "modem read cnt %d", cs->hw.elsa.rcvcnt);
+		QuickHex(t, cs->hw.elsa.rcvbuf, cs->hw.elsa.rcvcnt);
+		debugl1(cs, tmp);
+	}
+	cs->hw.elsa.rcvcnt = 0;
+}
+
+static inline void transmit_chars(struct IsdnCardState *cs, int *intr_done)
+{
+	int count;
+
+	debugl1(cs, "transmit_chars: p(%x) cnt(%x)", cs->hw.elsa.transp,
+		cs->hw.elsa.transcnt);
+
+	if (cs->hw.elsa.transcnt <= 0) {
+		cs->hw.elsa.IER &= ~UART_IER_THRI;
+		serial_out(cs, UART_IER, cs->hw.elsa.IER);
+		return;
+	}
+	count = 16;
+	do {
+		serial_outp(cs, UART_TX, cs->hw.elsa.transbuf[cs->hw.elsa.transp++]);
+		if (cs->hw.elsa.transp >= MAX_MODEM_BUF)
+			cs->hw.elsa.transp = 0;
+		if (--cs->hw.elsa.transcnt <= 0)
+			break;
+	} while (--count > 0);
+	if ((cs->hw.elsa.transcnt < WAKEUP_CHARS) && (cs->hw.elsa.MFlag == 2))
+		modem_fill(cs->hw.elsa.bcs);
+
+#ifdef SERIAL_DEBUG_INTR
+	printk("THRE...");
+#endif
+	if (intr_done)
+		*intr_done = 0;
+	if (cs->hw.elsa.transcnt <= 0) {
+		cs->hw.elsa.IER &= ~UART_IER_THRI;
+		serial_outp(cs, UART_IER, cs->hw.elsa.IER);
+	}
+}
+
+
+static void rs_interrupt_elsa(struct IsdnCardState *cs)
+{
+	int status, iir, msr;
+	int pass_counter = 0;
+
+#ifdef SERIAL_DEBUG_INTR
+	printk(KERN_DEBUG "rs_interrupt_single(%d)...", cs->irq);
+#endif
+
+	do {
+		status = serial_inp(cs, UART_LSR);
+		debugl1(cs, "rs LSR %02x", status);
+#ifdef SERIAL_DEBUG_INTR
+		printk("status = %x...", status);
+#endif
+		if (status & UART_LSR_DR)
+			receive_chars(cs, &status);
+		if (status & UART_LSR_THRE)
+			transmit_chars(cs, NULL);
+		if (pass_counter++ > RS_ISR_PASS_LIMIT) {
+			printk("rs_single loop break.\n");
+			break;
+		}
+		iir = serial_inp(cs, UART_IIR);
+		debugl1(cs, "rs IIR %02x", iir);
+		if ((iir & 0xf) == 0) {
+			msr = serial_inp(cs, UART_MSR);
+			debugl1(cs, "rs MSR %02x", msr);
+		}
+	} while (!(iir & UART_IIR_NO_INT));
+#ifdef SERIAL_DEBUG_INTR
+	printk("end.\n");
+#endif
+}
+
+extern int open_hscxstate(struct IsdnCardState *cs, struct BCState *bcs);
+extern void modehscx(struct BCState *bcs, int mode, int bc);
+extern void hscx_l2l1(struct PStack *st, int pr, void *arg);
+
+static void
+close_elsastate(struct BCState *bcs)
+{
+	modehscx(bcs, 0, bcs->channel);
+	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
+		if (bcs->hw.hscx.rcvbuf) {
+			if (bcs->mode != L1_MODE_MODEM)
+				kfree(bcs->hw.hscx.rcvbuf);
+			bcs->hw.hscx.rcvbuf = NULL;
+		}
+		skb_queue_purge(&bcs->rqueue);
+		skb_queue_purge(&bcs->squeue);
+		if (bcs->tx_skb) {
+			dev_kfree_skb_any(bcs->tx_skb);
+			bcs->tx_skb = NULL;
+			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+		}
+	}
+}
+
+static void
+modem_write_cmd(struct IsdnCardState *cs, u_char *buf, int len) {
+	int count, fp;
+	u_char *msg = buf;
+
+	if (!len)
+		return;
+	if (len > (MAX_MODEM_BUF - cs->hw.elsa.transcnt)) {
+		return;
+	}
+	fp = cs->hw.elsa.transcnt + cs->hw.elsa.transp;
+	fp &= (MAX_MODEM_BUF - 1);
+	count = len;
+	if (count > MAX_MODEM_BUF - fp) {
+		count = MAX_MODEM_BUF - fp;
+		memcpy(cs->hw.elsa.transbuf + fp, msg, count);
+		cs->hw.elsa.transcnt += count;
+		msg += count;
+		count = len - count;
+		fp = 0;
+	}
+	memcpy(cs->hw.elsa.transbuf + fp, msg, count);
+	cs->hw.elsa.transcnt += count;
+	if (cs->hw.elsa.transcnt &&
+	    !(cs->hw.elsa.IER & UART_IER_THRI)) {
+		cs->hw.elsa.IER |= UART_IER_THRI;
+		serial_outp(cs, UART_IER, cs->hw.elsa.IER);
+	}
+}
+
+static void
+modem_set_init(struct IsdnCardState *cs) {
+	int timeout;
+
+#define RCV_DELAY 20
+	modem_write_cmd(cs, MInit_1, strlen(MInit_1));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	modem_write_cmd(cs, MInit_2, strlen(MInit_2));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	modem_write_cmd(cs, MInit_3, strlen(MInit_3));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	modem_write_cmd(cs, MInit_4, strlen(MInit_4));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	modem_write_cmd(cs, MInit_5, strlen(MInit_5));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	modem_write_cmd(cs, MInit_6, strlen(MInit_6));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	modem_write_cmd(cs, MInit_7, strlen(MInit_7));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+}
+
+static void
+modem_set_dial(struct IsdnCardState *cs, int outgoing) {
+	int timeout;
+#define RCV_DELAY 20
+
+	modem_write_cmd(cs, MInit_speed28800, strlen(MInit_speed28800));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+	if (outgoing)
+		modem_write_cmd(cs, MInit_dialout, strlen(MInit_dialout));
+	else
+		modem_write_cmd(cs, MInit_dialin, strlen(MInit_dialin));
+	timeout = 1000;
+	while (timeout-- && cs->hw.elsa.transcnt)
+		udelay(1000);
+	debugl1(cs, "msi tout=%d", timeout);
+	mdelay(RCV_DELAY);
+}
+
+static void
+modem_l2l1(struct PStack *st, int pr, void *arg)
+{
+	struct BCState *bcs = st->l1.bcs;
+	struct sk_buff *skb = arg;
+	u_long flags;
+
+	if (pr == (PH_DATA | REQUEST)) {
+		spin_lock_irqsave(&bcs->cs->lock, flags);
+		if (bcs->tx_skb) {
+			skb_queue_tail(&bcs->squeue, skb);
+		} else {
+			bcs->tx_skb = skb;
+			test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
+			bcs->hw.hscx.count = 0;
+			write_modem(bcs);
+		}
+		spin_unlock_irqrestore(&bcs->cs->lock, flags);
+	} else if (pr == (PH_ACTIVATE | REQUEST)) {
+		test_and_set_bit(BC_FLG_ACTIV, &bcs->Flag);
+		st->l1.l1l2(st, PH_ACTIVATE | CONFIRM, NULL);
+		set_arcofi(bcs->cs, st->l1.bc);
+		mstartup(bcs->cs);
+		modem_set_dial(bcs->cs, test_bit(FLG_ORIG, &st->l2.flag));
+		bcs->cs->hw.elsa.MFlag = 2;
+	} else if (pr == (PH_DEACTIVATE | REQUEST)) {
+		test_and_clear_bit(BC_FLG_ACTIV, &bcs->Flag);
+		bcs->cs->dc.isac.arcofi_bc = st->l1.bc;
+		arcofi_fsm(bcs->cs, ARCOFI_START, &ARCOFI_XOP_0);
+		interruptible_sleep_on(&bcs->cs->dc.isac.arcofi_wait);
+		bcs->cs->hw.elsa.MFlag = 1;
+	} else {
+		printk(KERN_WARNING "ElsaSer: unknown pr %x\n", pr);
+	}
+}
+
+static int
+setstack_elsa(struct PStack *st, struct BCState *bcs)
+{
+
+	bcs->channel = st->l1.bc;
+	switch (st->l1.mode) {
+	case L1_MODE_HDLC:
+	case L1_MODE_TRANS:
+		if (open_hscxstate(st->l1.hardware, bcs))
+			return (-1);
+		st->l2.l2l1 = hscx_l2l1;
+		break;
+	case L1_MODE_MODEM:
+		bcs->mode = L1_MODE_MODEM;
+		if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
+			bcs->hw.hscx.rcvbuf = bcs->cs->hw.elsa.rcvbuf;
+			skb_queue_head_init(&bcs->rqueue);
+			skb_queue_head_init(&bcs->squeue);
+		}
+		bcs->tx_skb = NULL;
+		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+		bcs->event = 0;
+		bcs->hw.hscx.rcvidx = 0;
+		bcs->tx_cnt = 0;
+		bcs->cs->hw.elsa.bcs = bcs;
+		st->l2.l2l1 = modem_l2l1;
+		break;
+	}
+	st->l1.bcs = bcs;
+	setstack_manager(st);
+	bcs->st = st;
+	setstack_l1_B(st);
+	return (0);
+}
+
+static void
+init_modem(struct IsdnCardState *cs) {
+
+	cs->bcs[0].BC_SetStack = setstack_elsa;
+	cs->bcs[1].BC_SetStack = setstack_elsa;
+	cs->bcs[0].BC_Close = close_elsastate;
+	cs->bcs[1].BC_Close = close_elsastate;
+	if (!(cs->hw.elsa.rcvbuf = kmalloc(MAX_MODEM_BUF,
+					   GFP_ATOMIC))) {
+		printk(KERN_WARNING
+		       "Elsa: No modem mem hw.elsa.rcvbuf\n");
+		return;
+	}
+	if (!(cs->hw.elsa.transbuf = kmalloc(MAX_MODEM_BUF,
+					     GFP_ATOMIC))) {
+		printk(KERN_WARNING
+		       "Elsa: No modem mem hw.elsa.transbuf\n");
+		kfree(cs->hw.elsa.rcvbuf);
+		cs->hw.elsa.rcvbuf = NULL;
+		return;
+	}
+	if (mstartup(cs)) {
+		printk(KERN_WARNING "Elsa: problem startup modem\n");
+	}
+	modem_set_init(cs);
+}
+
+static void
+release_modem(struct IsdnCardState *cs) {
+
+	cs->hw.elsa.MFlag = 0;
+	if (cs->hw.elsa.transbuf) {
+		if (cs->hw.elsa.rcvbuf) {
+			mshutdown(cs);
+			kfree(cs->hw.elsa.rcvbuf);
+			cs->hw.elsa.rcvbuf = NULL;
+		}
+		kfree(cs->hw.elsa.transbuf);
+		cs->hw.elsa.transbuf = NULL;
+	}
+}