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!

1 files changed, 476 insertions, 0 deletions

diff --git a/arch/m68k/q40/q40ints.c b/arch/m68k/q40/q40ints.c
new file mode 100644
index 0000000..f8ecc26
--- /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:
+ */