drivers/isdn/hisax/hscx_irq.c - linux - Git at Google

 /* $Id: hscx_irq.c,v 1.18.2.3 2004/02/11 13:21:34 keil Exp $
  *
  * low level b-channel stuff for Siemens HSCX
  *
  * Author       Karsten Keil
  * Copyright    by Karsten Keil      <keil@isdn4linux.de>
  *
  * This software may be used and distributed according to the terms
  * of the GNU General Public License, incorporated herein by reference.
  *
  * This is an include file for fast inline IRQ stuff
  *
  */


 static inline void
 waitforCEC(struct IsdnCardState *cs, int hscx)
 {
 	int to = 50;

 	while ((READHSCX(cs, hscx, HSCX_STAR) & 0x04) && to) {
 		udelay(1);
 		to--;
 	}
 	if (!to)
 		printk(KERN_WARNING "HiSax: waitforCEC timeout\n");
 }


 static inline void
 waitforXFW(struct IsdnCardState *cs, int hscx)
 {
 	int to = 50;

 	while (((READHSCX(cs, hscx, HSCX_STAR) & 0x44) != 0x40) && to) {
 		udelay(1);
 		to--;
 	}
 	if (!to)
 		printk(KERN_WARNING "HiSax: waitforXFW timeout\n");
 }

 static inline void
 WriteHSCXCMDR(struct IsdnCardState *cs, int hscx, u_char data)
 {
 	waitforCEC(cs, hscx);
 	WRITEHSCX(cs, hscx, HSCX_CMDR, data);
 }


 static void
 hscx_empty_fifo(struct BCState *bcs, int count)
 {
 	u_char *ptr;
 	struct IsdnCardState *cs = bcs->cs;

 	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
 		debugl1(cs, "hscx_empty_fifo");

 	if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
 		if (cs->debug & L1_DEB_WARN)
 			debugl1(cs, "hscx_empty_fifo: incoming packet too large");
 		WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
 		bcs->hw.hscx.rcvidx = 0;
 		return;
 	}
 	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
 	bcs->hw.hscx.rcvidx += count;
 	READHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
 	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
 	if (cs->debug & L1_DEB_HSCX_FIFO) {
 		char *t = bcs->blog;

 		t += sprintf(t, "hscx_empty_fifo %c cnt %d",
 			     bcs->hw.hscx.hscx ? 'B' : 'A', count);
 		QuickHex(t, ptr, count);
 		debugl1(cs, bcs->blog);
 	}
 }

 static void
 hscx_fill_fifo(struct BCState *bcs)
 {
 	struct IsdnCardState *cs = bcs->cs;
 	int more, count;
 	int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
 	u_char *ptr;

 	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
 		debugl1(cs, "hscx_fill_fifo");

 	if (!bcs->tx_skb)
 		return;
 	if (bcs->tx_skb->len <= 0)
 		return;

 	more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
 	if (bcs->tx_skb->len > fifo_size) {
 		more = !0;
 		count = fifo_size;
 	} else
 		count = bcs->tx_skb->len;

 	waitforXFW(cs, bcs->hw.hscx.hscx);
 	ptr = bcs->tx_skb->data;
 	skb_pull(bcs->tx_skb, count);
 	bcs->tx_cnt -= count;
 	bcs->hw.hscx.count += count;
 	WRITEHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
 	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, more ? 0x8 : 0xa);
 	if (cs->debug & L1_DEB_HSCX_FIFO) {
 		char *t = bcs->blog;

 		t += sprintf(t, "hscx_fill_fifo %c cnt %d",
 			     bcs->hw.hscx.hscx ? 'B' : 'A', count);
 		QuickHex(t, ptr, count);
 		debugl1(cs, bcs->blog);
 	}
 }

 static void
 hscx_interrupt(struct IsdnCardState *cs, u_char val, u_char hscx)
 {
 	u_char r;
 	struct BCState *bcs = cs->bcs + hscx;
 	struct sk_buff *skb;
 	int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
 	int count;

 	if (!test_bit(BC_FLG_INIT, &bcs->Flag))
 		return;

 	if (val & 0x80) {	/* RME */
 		r = READHSCX(cs, hscx, HSCX_RSTA);
 		if ((r & 0xf0) != 0xa0) {
 			if (!(r & 0x80)) {
 				if (cs->debug & L1_DEB_WARN)
 					debugl1(cs, "HSCX invalid frame");
 #ifdef ERROR_STATISTIC
 				bcs->err_inv++;
 #endif
 			}
 			if ((r & 0x40) && bcs->mode) {
 				if (cs->debug & L1_DEB_WARN)
 					debugl1(cs, "HSCX RDO mode=%d",
 						bcs->mode);
 #ifdef ERROR_STATISTIC
 				bcs->err_rdo++;
 #endif
 			}
 			if (!(r & 0x20)) {
 				if (cs->debug & L1_DEB_WARN)
 					debugl1(cs, "HSCX CRC error");
 #ifdef ERROR_STATISTIC
 				bcs->err_crc++;
 #endif
 			}
 			WriteHSCXCMDR(cs, hscx, 0x80);
 		} else {
 			count = READHSCX(cs, hscx, HSCX_RBCL) & (
 				test_bit(HW_IPAC, &cs->HW_Flags)? 0x3f: 0x1f);
 			if (count == 0)
 				count = fifo_size;
 			hscx_empty_fifo(bcs, count);
 			if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
 				if (cs->debug & L1_DEB_HSCX_FIFO)
 					debugl1(cs, "HX Frame %d", count);
 				if (!(skb = dev_alloc_skb(count)))
 					printk(KERN_WARNING "HSCX: receive out of memory\n");
 				else {
 					memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
 					skb_queue_tail(&bcs->rqueue, skb);
 				}
 			}
 		}
 		bcs->hw.hscx.rcvidx = 0;
 		schedule_event(bcs, B_RCVBUFREADY);
 	}
 	if (val & 0x40) {	/* RPF */
 		hscx_empty_fifo(bcs, fifo_size);
 		if (bcs->mode == L1_MODE_TRANS) {
 			/* receive audio data */
 			if (!(skb = dev_alloc_skb(fifo_size)))
 				printk(KERN_WARNING "HiSax: receive out of memory\n");
 			else {
 				memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
 				skb_queue_tail(&bcs->rqueue, skb);
 			}
 			bcs->hw.hscx.rcvidx = 0;
 			schedule_event(bcs, B_RCVBUFREADY);
 		}
 	}
 	if (val & 0x10) {	/* XPR */
 		if (bcs->tx_skb) {
 			if (bcs->tx_skb->len) {
 				hscx_fill_fifo(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_irq(bcs->tx_skb);
 				bcs->hw.hscx.count = 0;
 				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);
 			hscx_fill_fifo(bcs);
 		} else {
 			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
 			schedule_event(bcs, B_XMTBUFREADY);
 		}
 	}
 }

 static void
 hscx_int_main(struct IsdnCardState *cs, u_char val)
 {

 	u_char exval;
 	struct BCState *bcs;

 	if (val & 0x01) {
 		bcs = cs->bcs + 1;
 		exval = READHSCX(cs, 1, HSCX_EXIR);
 		if (exval & 0x40) {
 			if (bcs->mode == 1)
 				hscx_fill_fifo(bcs);
 			else {
 #ifdef ERROR_STATISTIC
 				bcs->err_tx++;
 #endif
 				/* Here we lost an TX interrupt, so
 				   * restart transmitting the whole frame.
 				 */
 				if (bcs->tx_skb) {
 					skb_push(bcs->tx_skb, bcs->hw.hscx.count);
 					bcs->tx_cnt += bcs->hw.hscx.count;
 					bcs->hw.hscx.count = 0;
 				}
 				WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
 				if (cs->debug & L1_DEB_WARN)
 					debugl1(cs, "HSCX B EXIR %x Lost TX", exval);
 			}
 		} else if (cs->debug & L1_DEB_HSCX)
 			debugl1(cs, "HSCX B EXIR %x", exval);
 	}
 	if (val & 0xf8) {
 		if (cs->debug & L1_DEB_HSCX)
 			debugl1(cs, "HSCX B interrupt %x", val);
 		hscx_interrupt(cs, val, 1);
 	}
 	if (val & 0x02) {
 		bcs = cs->bcs;
 		exval = READHSCX(cs, 0, HSCX_EXIR);
 		if (exval & 0x40) {
 			if (bcs->mode == L1_MODE_TRANS)
 				hscx_fill_fifo(bcs);
 			else {
 				/* Here we lost an TX interrupt, so
 				   * restart transmitting the whole frame.
 				 */
 #ifdef ERROR_STATISTIC
 				bcs->err_tx++;
 #endif
 				if (bcs->tx_skb) {
 					skb_push(bcs->tx_skb, bcs->hw.hscx.count);
 					bcs->tx_cnt += bcs->hw.hscx.count;
 					bcs->hw.hscx.count = 0;
 				}
 				WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
 				if (cs->debug & L1_DEB_WARN)
 					debugl1(cs, "HSCX A EXIR %x Lost TX", exval);
 			}
 		} else if (cs->debug & L1_DEB_HSCX)
 			debugl1(cs, "HSCX A EXIR %x", exval);
 	}
 	if (val & 0x04) {
 		exval = READHSCX(cs, 0, HSCX_ISTA);
 		if (cs->debug & L1_DEB_HSCX)
 			debugl1(cs, "HSCX A interrupt %x", exval);
 		hscx_interrupt(cs, exval, 0);
 	}
 }
	/* $Id: hscx_irq.c,v 1.18.2.3 2004/02/11 13:21:34 keil Exp $
	*
	* low level b-channel stuff for Siemens HSCX
	*
	* Author Karsten Keil
	* Copyright by Karsten Keil <keil@isdn4linux.de>
	*
	* This software may be used and distributed according to the terms
	* of the GNU General Public License, incorporated herein by reference.
	*
	* This is an include file for fast inline IRQ stuff
	*
	*/


	static inline void
	waitforCEC(struct IsdnCardState *cs, int hscx)
	{
	int to = 50;

	while ((READHSCX(cs, hscx, HSCX_STAR) & 0x04) && to) {
	udelay(1);
	to--;
	}
	if (!to)
	printk(KERN_WARNING "HiSax: waitforCEC timeout\n");
	}


	static inline void
	waitforXFW(struct IsdnCardState *cs, int hscx)
	{
	int to = 50;

	while (((READHSCX(cs, hscx, HSCX_STAR) & 0x44) != 0x40) && to) {
	udelay(1);
	to--;
	}
	if (!to)
	printk(KERN_WARNING "HiSax: waitforXFW timeout\n");
	}

	static inline void
	WriteHSCXCMDR(struct IsdnCardState *cs, int hscx, u_char data)
	{
	waitforCEC(cs, hscx);
	WRITEHSCX(cs, hscx, HSCX_CMDR, data);
	}



	static void
	hscx_empty_fifo(struct BCState *bcs, int count)
	{
	u_char *ptr;
	struct IsdnCardState *cs = bcs->cs;

	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
	debugl1(cs, "hscx_empty_fifo");

	if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
	if (cs->debug & L1_DEB_WARN)
	debugl1(cs, "hscx_empty_fifo: incoming packet too large");
	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
	bcs->hw.hscx.rcvidx = 0;
	return;
	}
	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
	bcs->hw.hscx.rcvidx += count;
	READHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
	if (cs->debug & L1_DEB_HSCX_FIFO) {
	char *t = bcs->blog;

	t += sprintf(t, "hscx_empty_fifo %c cnt %d",
	bcs->hw.hscx.hscx ? 'B' : 'A', count);
	QuickHex(t, ptr, count);
	debugl1(cs, bcs->blog);
	}
	}

	static void
	hscx_fill_fifo(struct BCState *bcs)
	{
	struct IsdnCardState *cs = bcs->cs;
	int more, count;
	int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
	u_char *ptr;

	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
	debugl1(cs, "hscx_fill_fifo");

	if (!bcs->tx_skb)
	return;
	if (bcs->tx_skb->len <= 0)
	return;

	more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
	if (bcs->tx_skb->len > fifo_size) {
	more = !0;
	count = fifo_size;
	} else
	count = bcs->tx_skb->len;

	waitforXFW(cs, bcs->hw.hscx.hscx);
	ptr = bcs->tx_skb->data;
	skb_pull(bcs->tx_skb, count);
	bcs->tx_cnt -= count;
	bcs->hw.hscx.count += count;
	WRITEHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, more ? 0x8 : 0xa);
	if (cs->debug & L1_DEB_HSCX_FIFO) {
	char *t = bcs->blog;

	t += sprintf(t, "hscx_fill_fifo %c cnt %d",
	bcs->hw.hscx.hscx ? 'B' : 'A', count);
	QuickHex(t, ptr, count);
	debugl1(cs, bcs->blog);
	}
	}

	static void
	hscx_interrupt(struct IsdnCardState *cs, u_char val, u_char hscx)
	{
	u_char r;
	struct BCState *bcs = cs->bcs + hscx;
	struct sk_buff *skb;
	int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
	int count;

	if (!test_bit(BC_FLG_INIT, &bcs->Flag))
	return;

	if (val & 0x80) { /* RME */
	r = READHSCX(cs, hscx, HSCX_RSTA);
	if ((r & 0xf0) != 0xa0) {
	if (!(r & 0x80)) {
	if (cs->debug & L1_DEB_WARN)
	debugl1(cs, "HSCX invalid frame");
	#ifdef ERROR_STATISTIC
	bcs->err_inv++;
	#endif
	}
	if ((r & 0x40) && bcs->mode) {
	if (cs->debug & L1_DEB_WARN)
	debugl1(cs, "HSCX RDO mode=%d",
	bcs->mode);
	#ifdef ERROR_STATISTIC
	bcs->err_rdo++;
	#endif
	}
	if (!(r & 0x20)) {
	if (cs->debug & L1_DEB_WARN)
	debugl1(cs, "HSCX CRC error");
	#ifdef ERROR_STATISTIC
	bcs->err_crc++;
	#endif
	}
	WriteHSCXCMDR(cs, hscx, 0x80);
	} else {
	count = READHSCX(cs, hscx, HSCX_RBCL) & (
	test_bit(HW_IPAC, &cs->HW_Flags)? 0x3f: 0x1f);
	if (count == 0)
	count = fifo_size;
	hscx_empty_fifo(bcs, count);
	if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
	if (cs->debug & L1_DEB_HSCX_FIFO)
	debugl1(cs, "HX Frame %d", count);
	if (!(skb = dev_alloc_skb(count)))
	printk(KERN_WARNING "HSCX: receive out of memory\n");
	else {
	memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
	skb_queue_tail(&bcs->rqueue, skb);
	}
	}
	}
	bcs->hw.hscx.rcvidx = 0;
	schedule_event(bcs, B_RCVBUFREADY);
	}
	if (val & 0x40) { /* RPF */
	hscx_empty_fifo(bcs, fifo_size);
	if (bcs->mode == L1_MODE_TRANS) {
	/* receive audio data */
	if (!(skb = dev_alloc_skb(fifo_size)))
	printk(KERN_WARNING "HiSax: receive out of memory\n");
	else {
	memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
	skb_queue_tail(&bcs->rqueue, skb);
	}
	bcs->hw.hscx.rcvidx = 0;
	schedule_event(bcs, B_RCVBUFREADY);
	}
	}
	if (val & 0x10) { /* XPR */
	if (bcs->tx_skb) {
	if (bcs->tx_skb->len) {
	hscx_fill_fifo(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_irq(bcs->tx_skb);
	bcs->hw.hscx.count = 0;
	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);
	hscx_fill_fifo(bcs);
	} else {
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	schedule_event(bcs, B_XMTBUFREADY);
	}
	}
	}

	static void
	hscx_int_main(struct IsdnCardState *cs, u_char val)
	{

	u_char exval;
	struct BCState *bcs;

	if (val & 0x01) {
	bcs = cs->bcs + 1;
	exval = READHSCX(cs, 1, HSCX_EXIR);
	if (exval & 0x40) {
	if (bcs->mode == 1)
	hscx_fill_fifo(bcs);
	else {
	#ifdef ERROR_STATISTIC
	bcs->err_tx++;
	#endif
	/* Here we lost an TX interrupt, so
	* restart transmitting the whole frame.
	*/
	if (bcs->tx_skb) {
	skb_push(bcs->tx_skb, bcs->hw.hscx.count);
	bcs->tx_cnt += bcs->hw.hscx.count;
	bcs->hw.hscx.count = 0;
	}
	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
	if (cs->debug & L1_DEB_WARN)
	debugl1(cs, "HSCX B EXIR %x Lost TX", exval);
	}
	} else if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "HSCX B EXIR %x", exval);
	}
	if (val & 0xf8) {
	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "HSCX B interrupt %x", val);
	hscx_interrupt(cs, val, 1);
	}
	if (val & 0x02) {
	bcs = cs->bcs;
	exval = READHSCX(cs, 0, HSCX_EXIR);
	if (exval & 0x40) {
	if (bcs->mode == L1_MODE_TRANS)
	hscx_fill_fifo(bcs);
	else {
	/* Here we lost an TX interrupt, so
	* restart transmitting the whole frame.
	*/
	#ifdef ERROR_STATISTIC
	bcs->err_tx++;
	#endif
	if (bcs->tx_skb) {
	skb_push(bcs->tx_skb, bcs->hw.hscx.count);
	bcs->tx_cnt += bcs->hw.hscx.count;
	bcs->hw.hscx.count = 0;
	}
	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
	if (cs->debug & L1_DEB_WARN)
	debugl1(cs, "HSCX A EXIR %x Lost TX", exval);
	}
	} else if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "HSCX A EXIR %x", exval);
	}
	if (val & 0x04) {
	exval = READHSCX(cs, 0, HSCX_ISTA);
	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "HSCX A interrupt %x", exval);
	hscx_interrupt(cs, exval, 0);
	}
	}