/* $Id: teleint.c,v 1.16.2.5 2004/01/19 15:31:50 keil Exp $
   *
   * low level stuff for TeleInt isdn cards
   *
   * 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.
   *
   */
  
  #include <linux/init.h>
  #include "hisax.h"
  #include "isac.h"
  #include "hfc_2bs0.h"
  #include "isdnl1.h"
  
  static const char *TeleInt_revision = "$Revision: 1.16.2.5 $";
  
  #define byteout(addr, val) outb(val, addr)
  #define bytein(addr) inb(addr)
  
  static inline u_char
  readreg(unsigned int ale, unsigned int adr, u_char off)
  {
  	register u_char ret;
  	int max_delay = 2000;
  
  	byteout(ale, off);
  	ret = HFC_BUSY & bytein(ale);
  	while (ret && --max_delay)
  		ret = HFC_BUSY & bytein(ale);
  	if (!max_delay) {
  		printk(KERN_WARNING "TeleInt Busy not inactive
  ");
  		return (0);
  	}
  	ret = bytein(adr);
  	return (ret);
  }
  
  static inline void
  readfifo(unsigned int ale, unsigned int adr, u_char off, u_char *data, int size)
  {
  	register u_char ret;
  	register int max_delay = 20000;
  	register int i;
  
  	byteout(ale, off);
  	for (i = 0; i < size; i++) {
  		ret = HFC_BUSY & bytein(ale);
  		while (ret && --max_delay)
  			ret = HFC_BUSY & bytein(ale);
  		if (!max_delay) {
  			printk(KERN_WARNING "TeleInt Busy not inactive
  ");
  			return;
  		}
  		data[i] = bytein(adr);
  	}
  }
  
  
  static inline void
  writereg(unsigned int ale, unsigned int adr, u_char off, u_char data)
  {
  	register u_char ret;
  	int max_delay = 2000;
  
  	byteout(ale, off);
  	ret = HFC_BUSY & bytein(ale);
  	while (ret && --max_delay)
  		ret = HFC_BUSY & bytein(ale);
  	if (!max_delay) {
  		printk(KERN_WARNING "TeleInt Busy not inactive
  ");
  		return;
  	}
  	byteout(adr, data);
  }
  
  static inline void
  writefifo(unsigned int ale, unsigned int adr, u_char off, u_char *data, int size)
  {
  	register u_char ret;
  	register int max_delay = 20000;
  	register int i;
  
  	byteout(ale, off);
  	for (i = 0; i < size; i++) {
  		ret = HFC_BUSY & bytein(ale);
  		while (ret && --max_delay)
  			ret = HFC_BUSY & bytein(ale);
  		if (!max_delay) {
  			printk(KERN_WARNING "TeleInt Busy not inactive
  ");
  			return;
  		}
  		byteout(adr, data[i]);
  	}
  }
  
  /* Interface functions */
  
  static u_char
  ReadISAC(struct IsdnCardState *cs, u_char offset)
  {
  	cs->hw.hfc.cip = offset;
  	return (readreg(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, offset));
  }
  
  static void
  WriteISAC(struct IsdnCardState *cs, u_char offset, u_char value)
  {
  	cs->hw.hfc.cip = offset;
  	writereg(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, offset, value);
  }
  
  static void
  ReadISACfifo(struct IsdnCardState *cs, u_char *data, int size)
  {
  	cs->hw.hfc.cip = 0;
  	readfifo(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, 0, data, size);
  }
  
  static void
  WriteISACfifo(struct IsdnCardState *cs, u_char *data, int size)
  {
  	cs->hw.hfc.cip = 0;
  	writefifo(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, 0, data, size);
  }
  
  static u_char
  ReadHFC(struct IsdnCardState *cs, int data, u_char reg)
  {
  	register u_char ret;
  
  	if (data) {
  		cs->hw.hfc.cip = reg;
  		byteout(cs->hw.hfc.addr | 1, reg);
  		ret = bytein(cs->hw.hfc.addr);
  		if (cs->debug & L1_DEB_HSCX_FIFO && (data != 2))
  			debugl1(cs, "hfc RD %02x %02x", reg, ret);
  	} else
  		ret = bytein(cs->hw.hfc.addr | 1);
  	return (ret);
  }
  
  static void
  WriteHFC(struct IsdnCardState *cs, int data, u_char reg, u_char value)
  {
  	byteout(cs->hw.hfc.addr | 1, reg);
  	cs->hw.hfc.cip = reg;
  	if (data)
  		byteout(cs->hw.hfc.addr, value);
  	if (cs->debug & L1_DEB_HSCX_FIFO && (data != 2))
  		debugl1(cs, "hfc W%c %02x %02x", data ? 'D' : 'C', reg, value);
  }
  
  static irqreturn_t
  TeleInt_interrupt(int intno, void *dev_id)
  {
  	struct IsdnCardState *cs = dev_id;
  	u_char val;
  	u_long flags;
  
  	spin_lock_irqsave(&cs->lock, flags);
  	val = readreg(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, ISAC_ISTA);
  Start_ISAC:
  	if (val)
  		isac_interrupt(cs, val);
  	val = readreg(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, ISAC_ISTA);
  	if (val) {
  		if (cs->debug & L1_DEB_ISAC)
  			debugl1(cs, "ISAC IntStat after IntRoutine");
  		goto Start_ISAC;
  	}
  	writereg(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, ISAC_MASK, 0xFF);
  	writereg(cs->hw.hfc.addr | 1, cs->hw.hfc.addr, ISAC_MASK, 0x0);
  	spin_unlock_irqrestore(&cs->lock, flags);
  	return IRQ_HANDLED;
  }
  
  static void
  TeleInt_Timer(struct IsdnCardState *cs)
  {
  	int stat = 0;
  	u_long flags;
  
  	spin_lock_irqsave(&cs->lock, flags);
  	if (cs->bcs[0].mode) {
  		stat |= 1;
  		main_irq_hfc(&cs->bcs[0]);
  	}
  	if (cs->bcs[1].mode) {
  		stat |= 2;
  		main_irq_hfc(&cs->bcs[1]);
  	}
  	spin_unlock_irqrestore(&cs->lock, flags);
  	stat = HZ / 100;
  	if (!stat)
  		stat = 1;
  	cs->hw.hfc.timer.expires = jiffies + stat;
  	add_timer(&cs->hw.hfc.timer);
  }
  
  static void
  release_io_TeleInt(struct IsdnCardState *cs)
  {
  	del_timer(&cs->hw.hfc.timer);
  	releasehfc(cs);
  	if (cs->hw.hfc.addr)
  		release_region(cs->hw.hfc.addr, 2);
  }
  
  static void
  reset_TeleInt(struct IsdnCardState *cs)
  {
  	printk(KERN_INFO "TeleInt: resetting card
  ");
  	cs->hw.hfc.cirm |= HFC_RESET;
  	byteout(cs->hw.hfc.addr | 1, cs->hw.hfc.cirm);	/* Reset On */
  	mdelay(10);
  	cs->hw.hfc.cirm &= ~HFC_RESET;
  	byteout(cs->hw.hfc.addr | 1, cs->hw.hfc.cirm);	/* Reset Off */
  	mdelay(10);
  }
  
  static int
  TeleInt_card_msg(struct IsdnCardState *cs, int mt, void *arg)
  {
  	u_long flags;
  	int delay;
  
  	switch (mt) {
  	case CARD_RESET:
  		spin_lock_irqsave(&cs->lock, flags);
  		reset_TeleInt(cs);
  		spin_unlock_irqrestore(&cs->lock, flags);
  		return (0);
  	case CARD_RELEASE:
  		release_io_TeleInt(cs);
  		return (0);
  	case CARD_INIT:
  		spin_lock_irqsave(&cs->lock, flags);
  		reset_TeleInt(cs);
  		inithfc(cs);
  		clear_pending_isac_ints(cs);
  		initisac(cs);
  		/* Reenable all IRQ */
  		cs->writeisac(cs, ISAC_MASK, 0);
  		cs->writeisac(cs, ISAC_CMDR, 0x41);
  		spin_unlock_irqrestore(&cs->lock, flags);
  		delay = HZ / 100;
  		if (!delay)
  			delay = 1;
  		cs->hw.hfc.timer.expires = jiffies + delay;
  		add_timer(&cs->hw.hfc.timer);
  		return (0);
  	case CARD_TEST:
  		return (0);
  	}
  	return (0);
  }
  
  int setup_TeleInt(struct IsdnCard *card)
  {
  	struct IsdnCardState *cs = card->cs;
  	char tmp[64];
  
  	strcpy(tmp, TeleInt_revision);
  	printk(KERN_INFO "HiSax: TeleInt driver Rev. %s
  ", HiSax_getrev(tmp));
  	if (cs->typ != ISDN_CTYPE_TELEINT)
  		return (0);
  
  	cs->hw.hfc.addr = card->para[1] & 0x3fe;
  	cs->irq = card->para[0];
  	cs->hw.hfc.cirm = HFC_CIRM;
  	cs->hw.hfc.isac_spcr = 0x00;
  	cs->hw.hfc.cip = 0;
  	cs->hw.hfc.ctmt = HFC_CTMT | HFC_CLTIMER;
  	cs->bcs[0].hw.hfc.send = NULL;
  	cs->bcs[1].hw.hfc.send = NULL;
  	cs->hw.hfc.fifosize = 7 * 1024 + 512;
  	cs->hw.hfc.timer.function = (void *) TeleInt_Timer;
  	cs->hw.hfc.timer.data = (long) cs;
  	init_timer(&cs->hw.hfc.timer);
  	if (!request_region(cs->hw.hfc.addr, 2, "TeleInt isdn")) {
  		printk(KERN_WARNING
  		       "HiSax: TeleInt config port %x-%x already in use
  ",
  		       cs->hw.hfc.addr,
  		       cs->hw.hfc.addr + 2);
  		return (0);
  	}
  	/* HW IO = IO */
  	byteout(cs->hw.hfc.addr, cs->hw.hfc.addr & 0xff);
  	byteout(cs->hw.hfc.addr | 1, ((cs->hw.hfc.addr & 0x300) >> 8) | 0x54);
  	switch (cs->irq) {
  	case 3:
  		cs->hw.hfc.cirm |= HFC_INTA;
  		break;
  	case 4:
  		cs->hw.hfc.cirm |= HFC_INTB;
  		break;
  	case 5:
  		cs->hw.hfc.cirm |= HFC_INTC;
  		break;
  	case 7:
  		cs->hw.hfc.cirm |= HFC_INTD;
  		break;
  	case 10:
  		cs->hw.hfc.cirm |= HFC_INTE;
  		break;
  	case 11:
  		cs->hw.hfc.cirm |= HFC_INTF;
  		break;
  	default:
  		printk(KERN_WARNING "TeleInt: wrong IRQ
  ");
  		release_io_TeleInt(cs);
  		return (0);
  	}
  	byteout(cs->hw.hfc.addr | 1, cs->hw.hfc.cirm);
  	byteout(cs->hw.hfc.addr | 1, cs->hw.hfc.ctmt);
  
  	printk(KERN_INFO "TeleInt: defined at 0x%x IRQ %d
  ",
  	       cs->hw.hfc.addr, cs->irq);
  
  	setup_isac(cs);
  	cs->readisac = &ReadISAC;
  	cs->writeisac = &WriteISAC;
  	cs->readisacfifo = &ReadISACfifo;
  	cs->writeisacfifo = &WriteISACfifo;
  	cs->BC_Read_Reg = &ReadHFC;
  	cs->BC_Write_Reg = &WriteHFC;
  	cs->cardmsg = &TeleInt_card_msg;
  	cs->irq_func = &TeleInt_interrupt;
  	ISACVersion(cs, "TeleInt:");
  	return (1);
  }