Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

4 files changed, 984 insertions, 0 deletions

diff --git a/arch/m68k/q40/Makefile b/arch/m68k/q40/Makefile
new file mode 100644
index 00000000000..27eb42796af
--- /dev/null
+++ b/arch/m68k/q40/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for Linux arch/m68k/q40 source directory
+#
+
+obj-y		:= config.o q40ints.o
diff --git a/arch/m68k/q40/README b/arch/m68k/q40/README
new file mode 100644
index 00000000000..6bdbf487957
--- /dev/null
+++ b/arch/m68k/q40/README
@@ -0,0 +1,138 @@
+Linux for the Q40
+=================
+
+You may try http://www.geocities.com/SiliconValley/Bay/2602/ for
+some up to date information. Booter and other tools will be also
+available from this place or ftp.uni-erlangen.de/linux/680x0/q40/
+and mirrors.
+
+Hints to documentation usually refer to the linux source tree in
+/usr/src/linux/Documentation unless URL given.
+
+It seems IRQ unmasking can't be safely done on a Q40. IRQ probing
+is not implemented - do not try it! (See below)
+
+For a list of kernel command-line options read the documentation for the
+particular device drivers.
+
+The floppy imposes a very high interrupt load on the CPU, approx 30K/s.
+When something blocks interrupts (HD) it will lose some of them, so far
+this is not known to have caused any data loss. On highly loaded systems
+it can make the floppy very slow or practically stop. Other Q40 OS' simply
+poll the floppy for this reason - something that can't be done in Linux.
+Only possible cure is getting a 82072 controller with fifo instead of
+the 8272A.
+
+drivers used by the Q40, apart from the very obvious (console etc.):
+	drivers/char/q40_keyb.c		# use PC keymaps for national keyboards
+		     serial.c		# normal PC driver - any speed
+	             lp.c		# printer driver
+		     genrtc.c		# RTC
+		char/joystick/*		# most of this should work, not
+				        # in default config.in
+	        block/q40ide.c		# startup for ide
+		      ide*		# see Documentation/ide.txt
+		      floppy.c		# normal PC driver, DMA emu in asm/floppy.h
+					# and arch/m68k/kernel/entry.S
+					# see drivers/block/README.fd
+		net/ne.c
+		video/q40fb.c
+		parport/*
+		sound/dmasound_core.c
+		      dmasound_q40.c
+
+Various other PC drivers can be enabled simply by adding them to
+arch/m68k/config.in, especially 8 bit devices should be without any
+problems. For cards using 16bit io/mem more care is required, like
+checking byte order issues, hacking memcpy_*_io etc.
+
+
+Debugging
+=========
+
+Upon startup the kernel will usually output "ABCQGHIJ" into the SRAM,
+preceded by the booter signature. This is a trace just in case something
+went wrong during earliest setup stages of head.S.
+**Changed** to preserve SRAM contents by default, this is only done when
+requested - SRAM must start with '%LX$' signature to do this. '-d' option
+to 'lxx' loader enables this.
+
+SRAM can also be used as additional console device, use debug=mem.
+This will save kernel startup msgs into SRAM, the screen will display
+only the penguin - and shell prompt if it gets that far..
+Unfortunately only 2000 bytes are available.
+
+Serial console works and can also be used for debugging, see loader_txt
+
+Most problems seem to be caused by fawlty or badly configured io-cards or
+hard drives anyway.
+Make sure to configure the parallel port as SPP and remove IRQ/DMA jumpers
+for first testing. The Q40 does not support DMA and may have trouble with
+parallel ports version of interrupts.
+
+
+Q40 Hardware Description
+========================
+
+This is just an overview, see asm-m68k/* for details ask if you have any
+questions.
+
+The Q40 consists of a 68040@40 MHz, 1MB video RAM, up to 32MB RAM, AT-style
+keyboard interface, 1 Programmable LED, 2x8bit DACs and up to 1MB ROM, 1MB
+shadow ROM.
+The Q60 has any of 68060 or 68LC060 and up to 128 MB RAM.
+
+Most interfacing like floppy, IDE, serial and parallel ports is done via ISA
+slots. The ISA io and mem range is mapped (sparse&byteswapped!) into separate
+regions of the memory.
+The main interrupt register IIRQ_REG will indicate whether an IRQ was internal
+or from some ISA devices, EIRQ_REG can distinguish up to 8 ISA IRQs.
+
+The Q40 custom chip is programmable to provide 2 periodic timers:
+	- 50 or 200 Hz - level 2, !!THIS CANT BE DISABLED!!
+	- 10 or 20 KHz - level 4, used for dma-sound
+
+Linux uses the 200 Hz interrupt for timer and beep by default.
+
+
+Interrupts
+==========
+
+q40 master chip handles only a subset of level triggered interrupts.
+
+Linux has some requirements wrt interrupt architecture, these are
+to my knowledge:
+	(a) interrupt handler must not be reentered even when sti() is called
+	    from within handler
+	(b) working enable/disable_irq
+
+Luckily these requirements are only important for drivers shared
+with other architectures - ide,serial,parallel, ethernet.
+q40ints.c now contains a trivial hack for (a), (b) is more difficult
+because only irq's 4-15 can be disabled - and only all of them at once.
+Thus disable_irq() can effectively block the machine if the driver goes
+asleep.
+One thing to keep in mind when hacking around the interrupt code is
+that there is no way to find out which IRQ caused a request, [EI]IRQ_REG
+displays current state of the various IRQ lines.
+
+Keyboard
+========
+
+q40 receives AT make/break codes from the keyboard, these are translated to
+the PC scancodes x86 Linux uses. So by theory every national keyboard should
+work just by loading the appropriate x86 keytable - see any national-HOWTO.
+
+Unfortunately the AT->PC translation isn't quite trivial and even worse, my
+documentation of it is absolutely minimal - thus some exotic keys may not
+behave exactly as expected.
+
+There is still hope that it can be fixed completely though. If you encounter
+problems, email me ideally this:
+	- exact keypress/release sequence
+	- 'showkey -s' run on q40, non-X session
+	- 'showkey -s' run on a PC, non-X session
+	- AT codes as displayed by the q40 debugging ROM
+btw if the showkey output from PC and Q40 doesn't differ then you have some
+classic configuration problem - don't send me anything in this case
+
diff --git a/arch/m68k/q40/config.c b/arch/m68k/q40/config.c
new file mode 100644
index 00000000000..02b626bae4a
--- /dev/null
+++ b/arch/m68k/q40/config.c
@@ -0,0 +1,365 @@
+/*
+ *  arch/m68k/q40/config.c
+ *
+ *  Copyright (C) 1999 Richard Zidlicky
+ *
+ * originally based on:
+ *
+ *  linux/bvme/config.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file README.legal in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/major.h>
+#include <linux/serial_reg.h>
+#include <linux/rtc.h>
+#include <linux/vt_kern.h>
+
+#include <asm/io.h>
+#include <asm/rtc.h>
+#include <asm/bootinfo.h>
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/q40_master.h>
+
+extern void floppy_setup(char *str, int *ints);
+
+extern irqreturn_t q40_process_int (int level, struct pt_regs *regs);
+extern irqreturn_t (*q40_default_handler[]) (int, void *, struct pt_regs *);  /* added just for debugging */
+extern void q40_init_IRQ (void);
+extern void q40_free_irq (unsigned int, void *);
+extern int  show_q40_interrupts (struct seq_file *, void *);
+extern void q40_enable_irq (unsigned int);
+extern void q40_disable_irq (unsigned int);
+static void q40_get_model(char *model);
+static int  q40_get_hardware_list(char *buffer);
+extern int  q40_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
+extern void q40_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
+
+extern unsigned long q40_gettimeoffset (void);
+extern int q40_hwclk (int, struct rtc_time *);
+extern unsigned int q40_get_ss (void);
+extern int q40_set_clock_mmss (unsigned long);
+static int q40_get_rtc_pll(struct rtc_pll_info *pll);
+static int q40_set_rtc_pll(struct rtc_pll_info *pll);
+extern void q40_reset (void);
+void q40_halt(void);
+extern void q40_waitbut(void);
+void q40_set_vectors (void);
+
+extern void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/ );
+
+extern char m68k_debug_device[];
+static void q40_mem_console_write(struct console *co, const char *b,
+				    unsigned int count);
+
+extern int ql_ticks;
+
+static struct console q40_console_driver = {
+	.name =		"debug",
+	.flags =	CON_PRINTBUFFER,
+	.index =	-1,
+};
+
+
+/* early debugging function:*/
+extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
+static int _cpleft;
+
+static void q40_mem_console_write(struct console *co, const char *s,
+				  unsigned int count)
+{
+  char *p=(char *)s;
+
+  if (count<_cpleft)
+    while (count-- >0){
+      *q40_mem_cptr=*p++;
+      q40_mem_cptr+=4;
+      _cpleft--;
+    }
+}
+#if 0
+void printq40(char *str)
+{
+  int l=strlen(str);
+  char *p=q40_mem_cptr;
+
+  while (l-- >0 && _cpleft-- >0)
+    {
+      *p=*str++;
+      p+=4;
+    }
+  q40_mem_cptr=p;
+}
+#endif
+
+static int halted=0;
+
+#ifdef CONFIG_HEARTBEAT
+static void q40_heartbeat(int on)
+{
+  if (halted) return;
+
+  if (on)
+    Q40_LED_ON();
+  else
+    Q40_LED_OFF();
+}
+#endif
+
+void q40_reset(void)
+{
+        halted=1;
+        printk ("\n\n*******************************************\n"
+		"Called q40_reset : press the RESET button!! \n"
+		"*******************************************\n");
+	Q40_LED_ON();
+	while(1) ;
+}
+void q40_halt(void)
+{
+        halted=1;
+        printk ("\n\n*******************\n"
+		    "  Called q40_halt\n"
+		    "*******************\n");
+	Q40_LED_ON();
+	while(1) ;
+}
+
+static void q40_get_model(char *model)
+{
+    sprintf(model, "Q40");
+}
+
+/* No hardware options on Q40? */
+
+static int q40_get_hardware_list(char *buffer)
+{
+    *buffer = '\0';
+    return 0;
+}
+
+static unsigned int serports[]={0x3f8,0x2f8,0x3e8,0x2e8,0};
+void q40_disable_irqs(void)
+{
+  unsigned i,j;
+
+  j=0;
+  while((i=serports[j++])) outb(0,i+UART_IER);
+  master_outb(0,EXT_ENABLE_REG);
+  master_outb(0,KEY_IRQ_ENABLE_REG);
+}
+
+void __init config_q40(void)
+{
+    mach_sched_init      = q40_sched_init;
+
+    mach_init_IRQ        = q40_init_IRQ;
+    mach_gettimeoffset   = q40_gettimeoffset;
+    mach_hwclk           = q40_hwclk;
+    mach_get_ss          = q40_get_ss;
+    mach_get_rtc_pll     = q40_get_rtc_pll;
+    mach_set_rtc_pll     = q40_set_rtc_pll;
+    mach_set_clock_mmss	 = q40_set_clock_mmss;
+
+    mach_reset		 = q40_reset;
+    mach_free_irq	 = q40_free_irq;
+    mach_process_int	 = q40_process_int;
+    mach_get_irq_list	 = show_q40_interrupts;
+    mach_request_irq	 = q40_request_irq;
+    enable_irq		 = q40_enable_irq;
+    disable_irq          = q40_disable_irq;
+    mach_default_handler = &q40_default_handler;
+    mach_get_model       = q40_get_model;
+    mach_get_hardware_list = q40_get_hardware_list;
+
+#if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
+    mach_beep            = q40_mksound;
+#endif
+#ifdef CONFIG_HEARTBEAT
+    mach_heartbeat = q40_heartbeat;
+#endif
+    mach_halt = q40_halt;
+#ifdef CONFIG_DUMMY_CONSOLE
+    conswitchp = &dummy_con;
+#endif
+
+    /* disable a few things that SMSQ might have left enabled */
+    q40_disable_irqs();
+
+    /* no DMA at all, but ide-scsi requires it.. make sure
+     * all physical RAM fits into the boundary - otherwise
+     * allocator may play costly and useless tricks */
+    mach_max_dma_address = 1024*1024*1024;
+
+    /* useful for early debugging stages - writes kernel messages into SRAM */
+    if (!strncmp( m68k_debug_device,"mem",3 ))
+      {
+	/*printk("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
+	_cpleft=2000-((long)q40_mem_cptr-0xff020000)/4;
+	q40_console_driver.write = q40_mem_console_write;
+	register_console(&q40_console_driver);
+      }
+}
+
+
+int q40_parse_bootinfo(const struct bi_record *rec)
+{
+  return 1;
+}
+
+
+static inline unsigned char bcd2bin (unsigned char b)
+{
+	return ((b>>4)*10 + (b&15));
+}
+
+static inline unsigned char bin2bcd (unsigned char b)
+{
+	return (((b/10)*16) + (b%10));
+}
+
+
+unsigned long q40_gettimeoffset (void)
+{
+    return 5000*(ql_ticks!=0);
+}
+
+
+/*
+ * Looks like op is non-zero for setting the clock, and zero for
+ * reading the clock.
+ *
+ *  struct hwclk_time {
+ *         unsigned        sec;       0..59
+ *         unsigned        min;       0..59
+ *         unsigned        hour;      0..23
+ *         unsigned        day;       1..31
+ *         unsigned        mon;       0..11
+ *         unsigned        year;      00...
+ *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
+ * };
+ */
+
+int q40_hwclk(int op, struct rtc_time *t)
+{
+        if (op)
+	{	/* Write.... */
+	        Q40_RTC_CTRL |= Q40_RTC_WRITE;
+
+		Q40_RTC_SECS = bin2bcd(t->tm_sec);
+		Q40_RTC_MINS = bin2bcd(t->tm_min);
+		Q40_RTC_HOUR = bin2bcd(t->tm_hour);
+		Q40_RTC_DATE = bin2bcd(t->tm_mday);
+		Q40_RTC_MNTH = bin2bcd(t->tm_mon + 1);
+		Q40_RTC_YEAR = bin2bcd(t->tm_year%100);
+		if (t->tm_wday >= 0)
+			Q40_RTC_DOW = bin2bcd(t->tm_wday+1);
+
+	        Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
+	}
+	else
+	{	/* Read....  */
+	  Q40_RTC_CTRL |= Q40_RTC_READ;
+
+	  t->tm_year = bcd2bin (Q40_RTC_YEAR);
+	  t->tm_mon  = bcd2bin (Q40_RTC_MNTH)-1;
+	  t->tm_mday = bcd2bin (Q40_RTC_DATE);
+	  t->tm_hour = bcd2bin (Q40_RTC_HOUR);
+	  t->tm_min  = bcd2bin (Q40_RTC_MINS);
+	  t->tm_sec  = bcd2bin (Q40_RTC_SECS);
+
+	  Q40_RTC_CTRL &= ~(Q40_RTC_READ);
+
+	  if (t->tm_year < 70)
+	    t->tm_year += 100;
+	  t->tm_wday = bcd2bin(Q40_RTC_DOW)-1;
+
+	}
+
+	return 0;
+}
+
+unsigned int q40_get_ss(void)
+{
+	return bcd2bin(Q40_RTC_SECS);
+}
+
+/*
+ * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
+ * clock is out by > 30 minutes.  Logic lifted from atari code.
+ */
+
+int q40_set_clock_mmss (unsigned long nowtime)
+{
+	int retval = 0;
+	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
+
+	int rtc_minutes;
+
+
+	rtc_minutes = bcd2bin (Q40_RTC_MINS);
+
+	if ((rtc_minutes < real_minutes
+		? real_minutes - rtc_minutes
+			: rtc_minutes - real_minutes) < 30)
+	{
+	        Q40_RTC_CTRL |= Q40_RTC_WRITE;
+		Q40_RTC_MINS = bin2bcd(real_minutes);
+		Q40_RTC_SECS = bin2bcd(real_seconds);
+		Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
+	}
+	else
+		retval = -1;
+
+
+	return retval;
+}
+
+
+/* get and set PLL calibration of RTC clock */
+#define Q40_RTC_PLL_MASK ((1<<5)-1)
+#define Q40_RTC_PLL_SIGN (1<<5)
+
+static int q40_get_rtc_pll(struct rtc_pll_info *pll)
+{
+	int tmp=Q40_RTC_CTRL;
+	pll->pll_value = tmp & Q40_RTC_PLL_MASK;
+	if (tmp & Q40_RTC_PLL_SIGN)
+		pll->pll_value = -pll->pll_value;
+	pll->pll_max=31;
+	pll->pll_min=-31;
+	pll->pll_posmult=512;
+	pll->pll_negmult=256;
+	pll->pll_clock=125829120;
+	return 0;
+}
+
+static int q40_set_rtc_pll(struct rtc_pll_info *pll)
+{
+	if (!pll->pll_ctrl){
+		/* the docs are a bit unclear so I am doublesetting */
+		/* RTC_WRITE here ... */
+		int tmp = (pll->pll_value & 31) | (pll->pll_value<0 ? 32 : 0) |
+			  Q40_RTC_WRITE;
+		Q40_RTC_CTRL |= Q40_RTC_WRITE;
+		Q40_RTC_CTRL = tmp;
+		Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
+		return 0;
+	} else
+		return -EINVAL;
+}
diff --git a/arch/m68k/q40/q40ints.c b/arch/m68k/q40/q40ints.c
new file mode 100644
index 00000000000..f8ecc2664fe
--- /dev/null
+++ b/arch/m68k/q40/q40ints.c
@@ -0,0 +1,476 @@
+/*
+ * arch/m68k/q40/q40ints.c
+ *
+ * Copyright (C) 1999,2001 Richard Zidlicky
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ * .. used to be loosely based on bvme6000ints.c
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/hardirq.h>
+
+#include <asm/rtc.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+
+#include <asm/q40_master.h>
+#include <asm/q40ints.h>
+
+/*
+ * Q40 IRQs are defined as follows:
+ *            3,4,5,6,7,10,11,14,15 : ISA dev IRQs
+ *            16-31: reserved
+ *            32   : keyboard int
+ *            33   : frame int (50/200 Hz periodic timer)
+ *            34   : sample int (10/20 KHz periodic timer)
+ *
+*/
+
+extern int ints_inited;
+
+
+irqreturn_t q40_irq2_handler (int, void *, struct pt_regs *fp);
+
+
+static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
+static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs);
+
+
+#define DEVNAME_SIZE 24
+
+static struct q40_irq_node {
+	irqreturn_t	(*handler)(int, void *, struct pt_regs *);
+	unsigned long	flags;
+	void		*dev_id;
+  /*        struct q40_irq_node *next;*/
+        char	        devname[DEVNAME_SIZE];
+	unsigned	count;
+        unsigned short  state;
+} irq_tab[Q40_IRQ_MAX+1];
+
+short unsigned q40_ablecount[Q40_IRQ_MAX+1];
+
+/*
+ * void q40_init_IRQ (void)
+ *
+ * Parameters:	None
+ *
+ * Returns:	Nothing
+ *
+ * This function is called during kernel startup to initialize
+ * the q40 IRQ handling routines.
+ */
+
+static int disabled=0;
+
+void q40_init_IRQ (void)
+{
+	int i;
+
+	disabled=0;
+	for (i = 0; i <= Q40_IRQ_MAX; i++) {
+		irq_tab[i].handler = q40_defhand;
+		irq_tab[i].flags = 0;
+		irq_tab[i].dev_id = NULL;
+		/*		irq_tab[i].next = NULL;*/
+		irq_tab[i].devname[0] = 0;
+		irq_tab[i].count = 0;
+		irq_tab[i].state =0;
+		q40_ablecount[i]=0;   /* all enabled */
+	}
+
+	/* setup handler for ISA ints */
+	cpu_request_irq(IRQ2, q40_irq2_handler, 0, "q40 ISA and master chip",
+			NULL);
+
+	/* now enable some ints.. */
+	master_outb(1,EXT_ENABLE_REG);  /* ISA IRQ 5-15 */
+
+	/* make sure keyboard IRQ is disabled */
+	master_outb(0,KEY_IRQ_ENABLE_REG);
+}
+
+int q40_request_irq(unsigned int irq,
+		irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                unsigned long flags, const char *devname, void *dev_id)
+{
+  /*printk("q40_request_irq %d, %s\n",irq,devname);*/
+
+	if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
+		printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
+		return -ENXIO;
+	}
+
+	/* test for ISA ints not implemented by HW */
+	switch (irq)
+	  {
+	  case 1: case 2: case 8: case 9:
+	  case 12: case 13:
+	    printk("%s: ISA IRQ %d from %s not implemented by HW\n", __FUNCTION__, irq, devname);
+	    return -ENXIO;
+	  case 11:
+	    printk("warning IRQ 10 and 11 not distinguishable\n");
+	    irq=10;
+	  default:
+	    ;
+	  }
+
+	if (irq<Q40_IRQ_SAMPLE)
+	  {
+	    if (irq_tab[irq].dev_id != NULL)
+		  {
+		    printk("%s: IRQ %d from %s is not replaceable\n",
+			   __FUNCTION__, irq, irq_tab[irq].devname);
+		    return -EBUSY;
+		  }
+	    /*printk("IRQ %d set to handler %p\n",irq,handler);*/
+	    if (dev_id==NULL)
+		  {
+		printk("WARNING: dev_id == NULL in request_irq\n");
+		dev_id=(void*)1;
+	      }
+	    irq_tab[irq].handler = handler;
+	    irq_tab[irq].flags   = flags;
+	    irq_tab[irq].dev_id  = dev_id;
+	    strlcpy(irq_tab[irq].devname,devname,sizeof(irq_tab[irq].devname));
+	    irq_tab[irq].state = 0;
+	    return 0;
+	  }
+	else {
+	  /* Q40_IRQ_SAMPLE :somewhat special actions required here ..*/
+	  cpu_request_irq(4, handler, flags, devname, dev_id);
+	  cpu_request_irq(6, handler, flags, devname, dev_id);
+	  return 0;
+	}
+}
+
+void q40_free_irq(unsigned int irq, void *dev_id)
+{
+	if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
+		printk("%s: Incorrect IRQ %d, dev_id %x \n", __FUNCTION__, irq, (unsigned)dev_id);
+		return;
+	}
+
+	/* test for ISA ints not implemented by HW */
+	switch (irq)
+	  {
+	  case 1: case 2: case 8: case 9:
+	  case 12: case 13:
+	    printk("%s: ISA IRQ %d from %x invalid\n", __FUNCTION__, irq, (unsigned)dev_id);
+	    return;
+	  case 11: irq=10;
+	  default:
+	    ;
+	  }
+
+	if (irq<Q40_IRQ_SAMPLE)
+	  {
+	    if (irq_tab[irq].dev_id != dev_id)
+	      printk("%s: Removing probably wrong IRQ %d from %s\n",
+		     __FUNCTION__, irq, irq_tab[irq].devname);
+
+	    irq_tab[irq].handler = q40_defhand;
+	    irq_tab[irq].flags   = 0;
+	    irq_tab[irq].dev_id  = NULL;
+	    /* irq_tab[irq].devname = NULL; */
+	    /* do not reset state !! */
+	  }
+	else
+	  { /* == Q40_IRQ_SAMPLE */
+	    cpu_free_irq(4, dev_id);
+	    cpu_free_irq(6, dev_id);
+	  }
+}
+
+
+irqreturn_t q40_process_int (int level, struct pt_regs *fp)
+{
+  printk("unexpected interrupt vec=%x, pc=%lx, d0=%lx, d0_orig=%lx, d1=%lx, d2=%lx\n",
+          level, fp->pc, fp->d0, fp->orig_d0, fp->d1, fp->d2);
+  printk("\tIIRQ_REG = %x, EIRQ_REG = %x\n",master_inb(IIRQ_REG),master_inb(EIRQ_REG));
+  return IRQ_HANDLED;
+}
+
+/*
+ * this stuff doesn't really belong here..
+*/
+
+int ql_ticks;              /* 200Hz ticks since last jiffie */
+static int sound_ticks;
+
+#define SVOL 45
+
+void q40_mksound(unsigned int hz, unsigned int ticks)
+{
+  /* for now ignore hz, except that hz==0 switches off sound */
+  /* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */
+  if (hz==0)
+    {
+      if (sound_ticks)
+	sound_ticks=1;
+
+      *DAC_LEFT=128;
+      *DAC_RIGHT=128;
+
+      return;
+    }
+  /* sound itself is done in q40_timer_int */
+  if (sound_ticks == 0) sound_ticks=1000; /* pretty long beep */
+  sound_ticks=ticks<<1;
+}
+
+static irqreturn_t (*q40_timer_routine)(int, void *, struct pt_regs *);
+
+static irqreturn_t q40_timer_int (int irq, void * dev, struct pt_regs * regs)
+{
+    ql_ticks = ql_ticks ? 0 : 1;
+    if (sound_ticks)
+      {
+	unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL;
+	sound_ticks--;
+	*DAC_LEFT=sval;
+	*DAC_RIGHT=sval;
+      }
+
+    if (!ql_ticks)
+	q40_timer_routine(irq, dev, regs);
+    return IRQ_HANDLED;
+}
+
+void q40_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
+{
+    int timer_irq;
+
+    q40_timer_routine = timer_routine;
+    timer_irq=Q40_IRQ_FRAME;
+
+    if (request_irq(timer_irq, q40_timer_int, 0,
+				"timer", q40_timer_int))
+	panic ("Couldn't register timer int");
+
+    master_outb(-1,FRAME_CLEAR_REG);
+    master_outb( 1,FRAME_RATE_REG);
+}
+
+
+/*
+ * tables to translate bits into IRQ numbers
+ * it is a good idea to order the entries by priority
+ *
+*/
+
+struct IRQ_TABLE{ unsigned mask; int irq ;};
+#if 0
+static struct IRQ_TABLE iirqs[]={
+  {Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME},
+  {Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
+  {0,0}};
+#endif
+static struct IRQ_TABLE eirqs[] = {
+  { .mask = Q40_IRQ3_MASK,	.irq = 3 },	/* ser 1 */
+  { .mask = Q40_IRQ4_MASK,	.irq = 4 },	/* ser 2 */
+  { .mask = Q40_IRQ14_MASK,	.irq = 14 },	/* IDE 1 */
+  { .mask = Q40_IRQ15_MASK,	.irq = 15 },	/* IDE 2 */
+  { .mask = Q40_IRQ6_MASK,	.irq = 6 },	/* floppy, handled elsewhere */
+  { .mask = Q40_IRQ7_MASK,	.irq = 7 },	/* par */
+  { .mask = Q40_IRQ5_MASK,	.irq = 5 },
+  { .mask = Q40_IRQ10_MASK,	.irq = 10 },
+  {0,0}
+};
+
+/* complain only this many times about spurious ints : */
+static int ccleirq=60;    /* ISA dev IRQ's*/
+/*static int cclirq=60;*/     /* internal */
+
+/* FIXME: add shared ints,mask,unmask,probing.... */
+
+#define IRQ_INPROGRESS 1
+/*static unsigned short saved_mask;*/
+//static int do_tint=0;
+
+#define DEBUG_Q40INT
+/*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */
+
+static int mext_disabled=0;  /* ext irq disabled by master chip? */
+static int aliased_irq=0;  /* how many times inside handler ?*/
+
+
+/* got level 2 interrupt, dispatch to ISA or keyboard/timer IRQs */
+irqreturn_t q40_irq2_handler (int vec, void *devname, struct pt_regs *fp)
+{
+  unsigned mir, mer;
+  int irq,i;
+
+//repeat:
+  mir=master_inb(IIRQ_REG);
+  if (mir&Q40_IRQ_FRAME_MASK) {
+	  irq_tab[Q40_IRQ_FRAME].count++;
+	  irq_tab[Q40_IRQ_FRAME].handler(Q40_IRQ_FRAME,irq_tab[Q40_IRQ_FRAME].dev_id,fp);
+	  master_outb(-1,FRAME_CLEAR_REG);
+  }
+  if ((mir&Q40_IRQ_SER_MASK) || (mir&Q40_IRQ_EXT_MASK)) {
+	  mer=master_inb(EIRQ_REG);
+	  for (i=0; eirqs[i].mask; i++) {
+		  if (mer&(eirqs[i].mask)) {
+			  irq=eirqs[i].irq;
+/*
+ * There is a little mess wrt which IRQ really caused this irq request. The
+ * main problem is that IIRQ_REG and EIRQ_REG reflect the state when they
+ * are read - which is long after the request came in. In theory IRQs should
+ * not just go away but they occassionally do
+ */
+			  if (irq>4 && irq<=15 && mext_disabled) {
+				  /*aliased_irq++;*/
+				  goto iirq;
+			  }
+			  if (irq_tab[irq].handler == q40_defhand ) {
+				  printk("handler for IRQ %d not defined\n",irq);
+				  continue; /* ignore uninited INTs :-( */
+			  }
+			  if ( irq_tab[irq].state & IRQ_INPROGRESS ) {
+				  /* some handlers do local_irq_enable() for irq latency reasons, */
+				  /* however reentering an active irq handler is not permitted */
+#ifdef IP_USE_DISABLE
+				  /* in theory this is the better way to do it because it still */
+				  /* lets through eg the serial irqs, unfortunately it crashes */
+				  disable_irq(irq);
+				  disabled=1;
+#else
+				  /*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",irq,disabled ? "already" : "not yet"); */
+				  fp->sr = (((fp->sr) & (~0x700))+0x200);
+				  disabled=1;
+#endif
+				  goto iirq;
+			  }
+			  irq_tab[irq].count++;
+			  irq_tab[irq].state |= IRQ_INPROGRESS;
+			  irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
+			  irq_tab[irq].state &= ~IRQ_INPROGRESS;
+
+			  /* naively enable everything, if that fails than    */
+			  /* this function will be reentered immediately thus */
+			  /* getting another chance to disable the IRQ        */
+
+			  if ( disabled ) {
+#ifdef IP_USE_DISABLE
+				  if (irq>4){
+					  disabled=0;
+					  enable_irq(irq);}
+#else
+				  disabled=0;
+				  /*printk("reenabling irq %d\n",irq); */
+#endif
+			  }
+// used to do 'goto repeat;' here, this delayed bh processing too long
+			  return IRQ_HANDLED;
+		  }
+	  }
+	  if (mer && ccleirq>0 && !aliased_irq)
+		  printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer),ccleirq--;
+  }
+ iirq:
+  mir=master_inb(IIRQ_REG);
+  /* should test whether keyboard irq is really enabled, doing it in defhand */
+  if (mir&Q40_IRQ_KEYB_MASK) {
+	  irq_tab[Q40_IRQ_KEYBOARD].count++;
+	  irq_tab[Q40_IRQ_KEYBOARD].handler(Q40_IRQ_KEYBOARD,irq_tab[Q40_IRQ_KEYBOARD].dev_id,fp);
+  }
+  return IRQ_HANDLED;
+}
+
+int show_q40_interrupts (struct seq_file *p, void *v)
+{
+	int i;
+
+	for (i = 0; i <= Q40_IRQ_MAX; i++) {
+		if (irq_tab[i].count)
+		      seq_printf(p, "%sIRQ %02d: %8d  %s%s\n",
+			      (i<=15) ? "ISA-" : "    " ,
+			    i, irq_tab[i].count,
+			    irq_tab[i].devname[0] ? irq_tab[i].devname : "?",
+			    irq_tab[i].handler == q40_defhand ?
+					" (now unassigned)" : "");
+	}
+	return 0;
+}
+
+
+static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp)
+{
+        if (irq!=Q40_IRQ_KEYBOARD)
+	     printk ("Unknown q40 interrupt %d\n", irq);
+	else master_outb(-1,KEYBOARD_UNLOCK_REG);
+	return IRQ_NONE;
+}
+static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs)
+{
+	printk ("Uninitialised interrupt level %d\n", lev);
+	return IRQ_NONE;
+}
+
+irqreturn_t (*q40_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
+	 [0] = default_handler,
+	 [1] = default_handler,
+	 [2] = default_handler,
+	 [3] = default_handler,
+	 [4] = default_handler,
+	 [5] = default_handler,
+	 [6] = default_handler,
+	 [7] = default_handler
+};
+
+
+void q40_enable_irq (unsigned int irq)
+{
+  if ( irq>=5 && irq<=15 )
+  {
+    mext_disabled--;
+    if (mext_disabled>0)
+	  printk("q40_enable_irq : nested disable/enable\n");
+    if (mext_disabled==0)
+    master_outb(1,EXT_ENABLE_REG);
+    }
+}
+
+
+void q40_disable_irq (unsigned int irq)
+{
+  /* disable ISA iqs : only do something if the driver has been
+   * verified to be Q40 "compatible" - right now IDE, NE2K
+   * Any driver should not attempt to sleep across disable_irq !!
+   */
+
+  if ( irq>=5 && irq<=15 ) {
+    master_outb(0,EXT_ENABLE_REG);
+    mext_disabled++;
+    if (mext_disabled>1) printk("disable_irq nesting count %d\n",mext_disabled);
+  }
+}
+
+unsigned long q40_probe_irq_on (void)
+{
+  printk("irq probing not working - reconfigure the driver to avoid this\n");
+  return -1;
+}
+int q40_probe_irq_off (unsigned long irqs)
+{
+  return -1;
+}
+/*
+ * Local variables:
+ * compile-command: "m68k-linux-gcc -D__KERNEL__ -I/home/rz/lx/linux-2.2.6/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -m68040   -c -o q40ints.o q40ints.c"
+ * End:
+ */