isdn: remove hisax driver

With the decline of ISDN, this seems to have become almost completely
obsolete, and even in the past years before that, almost all remaining
users appear to have used mISDN instead.

Birger Harzenetter noted that he is still using i4l/hisax to take
advantage of the 'divert' driver for call diversion, but otherwise uses
mISDN on the same hardware. This is a rare edge case as far as I
can tell, but we are still breaking an actively used work flow
(see https://xkcd.com/1172/).

We debated moving i4l/hisax to staging as an intermediate step, but as
he is not likely to change the setup, and that would just delay breaking
this use case.  The alternatives here are to stay on stable kernels
< 5.2, to create an external driver repository for isdn4linux, or to
add divert functionality to mISDN.

Cc: Birger Harzenetter <WIMPy@yeti.dk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 260 deletions

diff --git a/drivers/isdn/hisax/s0box.c b/drivers/isdn/hisax/s0box.c
deleted file mode 100644
index 4e7d0aa227ad..000000000000
--- a/drivers/isdn/hisax/s0box.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/* $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"
-
-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 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: S0Box ports %x-%x already in use\n",
-		       cs->hw.teles3.cfg_reg,
-		       cs->hw.teles3.cfg_reg + 7);
-		return 0;
-	}
-	printk(KERN_INFO "HiSax: S0Box config irq:%d isac:0x%x  cfg:0x%x\n",
-	       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);
-}