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/* $Id: s0box.c,v 2.6.2.4 2004/01/13 23:48:39 keil Exp $

 *

 * low level stuff for Creatix S0BOX

 *

 * Author       Enrik Berkhan

 * Copyright    by Enrik Berkhan <enrik@starfleet.inka.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 "hscx.h"

#include "isdnl1.h"

extern const char *CardType[];

static const char *s0box_revision = "$Revision: 2.6.2.4 $";

static inline void

writereg(unsigned int padr, signed int addr, u_char off, u_char val) {

        outb_p(0x1c,padr+2);

        outb_p(0x14,padr+2);

        outb_p((addr+off)&0x7f,padr);

        outb_p(0x16,padr+2);

        outb_p(val,padr);

        outb_p(0x17,padr+2);

        outb_p(0x14,padr+2);

        outb_p(0x1c,padr+2);

}

static u_char nibtab[] = { 1, 9, 5, 0xd, 3, 0xb, 7, 0xf,

                         0, 0, 0, 0, 0, 0, 0, 0,

                         0, 8, 4, 0xc, 2, 0xa, 6, 0xe } ;

static inline u_char

readreg(unsigned int padr, signed int addr, u_char off) {

        register u_char n1, n2;

        outb_p(0x1c,padr+2);

        outb_p(0x14,padr+2);

        outb_p((addr+off)|0x80,padr);

        outb_p(0x16,padr+2);

        outb_p(0x17,padr+2);

        n1 = (inb_p(padr+1) >> 3) & 0x17;

        outb_p(0x16,padr+2);

        n2 = (inb_p(padr+1) >> 3) & 0x17;

        outb_p(0x14,padr+2);

        outb_p(0x1c,padr+2);

        return nibtab[n1] | (nibtab[n2] << 4);

}

static inline void

read_fifo(unsigned int padr, signed int adr, u_char * data, int size)

{

        int i;

        register u_char n1, n2;

        outb_p(0x1c, padr+2);

        outb_p(0x14, padr+2);

        outb_p(adr|0x80, padr);

        outb_p(0x16, padr+2);

        for (i=0; i<size; i++) {

                outb_p(0x17, padr+2);

                n1 = (inb_p(padr+1) >> 3) & 0x17;

                outb_p(0x16,padr+2);

                n2 = (inb_p(padr+1) >> 3) & 0x17;

                *(data++)=nibtab[n1] | (nibtab[n2] << 4);

        }

        outb_p(0x14,padr+2);

        outb_p(0x1c,padr+2);

        return;

}

static inline void

write_fifo(unsigned int padr, signed int adr, u_char * data, int size)

{

        int i;

        outb_p(0x1c, padr+2);

        outb_p(0x14, padr+2);

        outb_p(adr&0x7f, padr);

        for (i=0; i<size; i++) {

                outb_p(0x16, padr+2);

                outb_p(*(data++), padr);

                outb_p(0x17, padr+2);

        }

        outb_p(0x14,padr+2);

        outb_p(0x1c,padr+2);

        return;

}

/* Interface functions */

static u_char

ReadISAC(struct IsdnCardState *cs, u_char offset)

{

        return (readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, offset));

}

static void

WriteISAC(struct IsdnCardState *cs, u_char offset, u_char value)

{

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, offset, value);

}

static void

ReadISACfifo(struct IsdnCardState *cs, u_char * data, int size)

{

        read_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.isacfifo, data, size);

}

static void

WriteISACfifo(struct IsdnCardState *cs, u_char * data, int size)

{

        write_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.isacfifo, data, size);

}

static u_char

ReadHSCX(struct IsdnCardState *cs, int hscx, u_char offset)

{

        return (readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[hscx], offset));

}

static void

WriteHSCX(struct IsdnCardState *cs, int hscx, u_char offset, u_char value)

{

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[hscx], offset, value);

}

/*

 * fast interrupt HSCX stuff goes here

 */

#define READHSCX(cs, nr, reg) readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[nr], reg)

#define WRITEHSCX(cs, nr, reg, data) writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[nr], reg, data)

#define READHSCXFIFO(cs, nr, ptr, cnt) read_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscxfifo[nr], ptr, cnt)

#define WRITEHSCXFIFO(cs, nr, ptr, cnt) write_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscxfifo[nr], ptr, cnt)

#include "hscx_irq.c"

static irqreturn_t

s0box_interrupt(int intno, void *dev_id)

{

#define MAXCOUNT 5

        struct IsdnCardState *cs = dev_id;

        u_char val;

        u_long flags;

        int count = 0;

        spin_lock_irqsave(&cs->lock, flags);

        val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_ISTA);

      Start_HSCX:

        if (val)

                hscx_int_main(cs, val);

        val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_ISTA);

      Start_ISAC:

        if (val)

                isac_interrupt(cs, val);

        count++;

        val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_ISTA);

        if (val && count < MAXCOUNT) {

                if (cs->debug & L1_DEB_HSCX)

                        debugl1(cs, "HSCX IntStat after IntRoutine");

                goto Start_HSCX;

        }

        val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_ISTA);

        if (val && count < MAXCOUNT) {

                if (cs->debug & L1_DEB_ISAC)

                        debugl1(cs, "ISAC IntStat after IntRoutine");

                goto Start_ISAC;

        }

        if (count >= MAXCOUNT)

                printk(KERN_WARNING "S0Box: more than %d loops in s0box_interrupt\n", count);

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[0], HSCX_MASK, 0xFF);

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_MASK, 0xFF);

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_MASK, 0xFF);

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_MASK, 0x0);

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[0], HSCX_MASK, 0x0);

        writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_MASK, 0x0);

        spin_unlock_irqrestore(&cs->lock, flags);

        return IRQ_HANDLED;

}

static void

release_io_s0box(struct IsdnCardState *cs)

{

        release_region(cs->hw.teles3.cfg_reg, 8);

}

static int

S0Box_card_msg(struct IsdnCardState *cs, int mt, void *arg)

{

        u_long flags;

        switch (mt) {

                case CARD_RESET:

                        break;

                case CARD_RELEASE:

                        release_io_s0box(cs);

                        break;

                case CARD_INIT:

                        spin_lock_irqsave(&cs->lock, flags);

                        inithscxisac(cs, 3);

                        spin_unlock_irqrestore(&cs->lock, flags);

                        break;

                case CARD_TEST:

                        break;

        }

        return(0);

}

int __devinit

setup_s0box(struct IsdnCard *card)

{

        struct IsdnCardState *cs = card->cs;

        char tmp[64];

        strcpy(tmp, s0box_revision);

        printk(KERN_INFO "HiSax: S0Box IO driver Rev. %s\n", HiSax_getrev(tmp));

        if (cs->typ != ISDN_CTYPE_S0BOX)

                return (0);

        cs->hw.teles3.cfg_reg = card->para[1];

        cs->hw.teles3.hscx[0] = -0x20;

        cs->hw.teles3.hscx[1] = 0x0;

        cs->hw.teles3.isac = 0x20;

        cs->hw.teles3.isacfifo = cs->hw.teles3.isac + 0x3e;

        cs->hw.teles3.hscxfifo[0] = cs->hw.teles3.hscx[0] + 0x3e;

        cs->hw.teles3.hscxfifo[1] = cs->hw.teles3.hscx[1] + 0x3e;

        cs->irq = card->para[0];

        if (!request_region(cs->hw.teles3.cfg_reg,8, "S0Box parallel I/O")) {

                printk(KERN_WARNING

                       "HiSax: %s ports %x-%x already in use\n",

                       CardType[cs->typ],

                       cs->hw.teles3.cfg_reg,

                       cs->hw.teles3.cfg_reg + 7);

                return 0;

        }

        printk(KERN_INFO

                "HiSax: %s config irq:%d isac:0x%x  cfg:0x%x\n",

                CardType[cs->typ], cs->irq,

                cs->hw.teles3.isac, cs->hw.teles3.cfg_reg);

        printk(KERN_INFO

                "HiSax: hscx A:0x%x  hscx B:0x%x\n",

                cs->hw.teles3.hscx[0], cs->hw.teles3.hscx[1]);

        setup_isac(cs);

        cs->readisac = &ReadISAC;

        cs->writeisac = &WriteISAC;

        cs->readisacfifo = &ReadISACfifo;

        cs->writeisacfifo = &WriteISACfifo;

        cs->BC_Read_Reg = &ReadHSCX;

        cs->BC_Write_Reg = &WriteHSCX;

        cs->BC_Send_Data = &hscx_fill_fifo;

        cs->cardmsg = &S0Box_card_msg;

        cs->irq_func = &s0box_interrupt;

        ISACVersion(cs, "S0Box:");

        if (HscxVersion(cs, "S0Box:")) {

                printk(KERN_WARNING

                       "S0Box: wrong HSCX versions check IO address\n");

                release_io_s0box(cs);

                return (0);

        }

        return (1);

}