patch-2.2.8 linux/arch/m68k/q40/q40ints.c

• Lines: 348
• Date: Tue May 11 09:57:14 1999
• Orig file: v2.2.7/linux/arch/m68k/q40/q40ints.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.7/linux/arch/m68k/q40/q40ints.c linux/arch/m68k/q40/q40ints.c
@@ -0,0 +1,347 @@
+/*
+ * arch/m68k/q40/q40ints.c
+ *
+ * Copyright (C) 1999 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.
+ *
+ * losely based on bvme6000ints.c
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.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 Hz periodic timer)
+ *            34   : sample int (10/20 KHz periodic timer)
+ *          
+*/
+
+extern int ints_inited;
+
+
+void q40_irq2_handler (int, void *, struct pt_regs *fp);
+
+
+extern void (*q40_sys_default_handler[]) (int, void *, struct pt_regs *);  /* added just for debugging */
+
+static void q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
+static void sys_default_handler(int lev, void *dev_id, struct pt_regs *regs);
+
+/*
+ * This should ideally be 4 elements only, for speed.
+ */
+
+#define DEVNAME_SIZE 24
+
+static struct {
+	void		(*handler)(int, void *, struct pt_regs *);
+	unsigned long	flags;
+	void		*dev_id;
+        char	        devname[DEVNAME_SIZE];
+	unsigned	count;
+} irq_tab[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.
+ */
+
+void q40_init_IRQ (void)
+{
+	int i;
+
+	for (i = 0; i <= Q40_IRQ_MAX; i++) {
+		irq_tab[i].handler = q40_defhand;
+		irq_tab[i].flags = IRQ_FLG_STD;
+		irq_tab[i].dev_id = NULL;
+		irq_tab[i].devname[0] = 0;
+		irq_tab[i].count = 0;
+	}
+
+	/* setup handler for ISA ints */
+	sys_request_irq(IRQ2,q40_irq2_handler, IRQ_FLG_LOCK, "q40 ISA and master chip", NULL);
+
+	/* now enable some ints.. */
+
+#if 0  /* has been abandoned */
+	master_outb(1,SER_ENABLE_REG);
+#endif
+	master_outb(1,EXT_ENABLE_REG);
+
+	/* would be spurious ints by now, q40kbd_init_hw() does that */
+	master_outb(0,KEY_IRQ_ENABLE_REG);
+}
+
+int q40_request_irq(unsigned int irq,
+		void (*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 */
+	if (irq<15) 
+	  {
+	    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;
+	    default:
+	    }
+	  }
+
+	if (irq<Q40_IRQ_TIMER)
+	  {
+	    if (irq==11) {
+	      printk("warning IRQ 10 and 11 not distinguishable\n");
+	      irq=10;
+	    }
+	    if (!(irq_tab[irq].flags & IRQ_FLG_STD)) 
+	      {
+		if (irq_tab[irq].flags & IRQ_FLG_LOCK) 
+		  {
+		    printk("%s: IRQ %d from %s is not replaceable\n",
+			   __FUNCTION__, irq, irq_tab[irq].devname);
+		    return -EBUSY;
+		  }
+		if (flags & IRQ_FLG_REPLACE) 
+		  {
+		    printk("%s: %s can't replace IRQ %d from %s\n",
+			   __FUNCTION__, devname, irq, irq_tab[irq].devname);
+		    return -EBUSY;
+		  }
+	      }
+	    /*printk("IRQ %d set to handler %p\n",irq,handler);*/
+	    irq_tab[irq].handler = handler;
+	    irq_tab[irq].flags   = flags;
+	    irq_tab[irq].dev_id  = dev_id;
+	    strncpy(irq_tab[irq].devname,devname,DEVNAME_SIZE);
+	    return 0;
+	  }
+	else {
+	  /* Q40_IRQ_TIMER :somewhat special actions required here ..*/
+	  sys_request_irq(4,handler,flags,devname,dev_id);
+	  sys_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 */
+	if (irq<15) {
+	  switch (irq){
+	  case 1: case 2: case 8: case 9:
+	  case 12: case 13:
+	        printk("%s: ISA IRQ %d from %x illegal\n", __FUNCTION__, irq, (unsigned)dev_id);
+		return;
+	  default:
+		  }
+	}
+	
+	if (irq<Q40_IRQ_TIMER){
+	  if (irq==11) irq=10;
+	  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   = IRQ_FLG_STD;
+	  irq_tab[irq].dev_id  = NULL;
+	  /* irq_tab[irq].devname = NULL; */
+	} else { /* == Q40_IRQ_TIMER */
+	  sys_free_irq(4,dev_id);
+	  sys_free_irq(6,dev_id);
+	}
+}
+
+#if 1
+void q40_process_int (int level, struct pt_regs *fp)
+{
+  printk("unexpected interrupt %x\n",level);
+}
+#endif
+
+/* 
+ * 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 ;};
+
+static struct IRQ_TABLE iirqs[]={
+  {IRQ_FRAME_MASK,Q40_IRQ_FRAME},
+  {IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
+  {0,0}};
+static struct IRQ_TABLE eirqs[]={
+  {IRQ3_MASK,3},                   /* ser 1 */
+  {IRQ4_MASK,4},                   /* ser 2 */
+  {IRQ14_MASK,14},                 /* IDE 1 */
+  {IRQ15_MASK,15},                 /* IDE 2 */
+  {IRQ6_MASK,6},                   /* floppy */
+  {IRQ7_MASK,7},                   /* par */
+
+  {IRQ5_MASK,5},
+  {IRQ10_MASK,10},
+
+
+
+
+  {0,0}};
+
+/* complaiun only this many times about spurious ints : */
+static int ccleirq=60;    /* ISA dev IRQ's*/
+static int cclirq=60;     /* internal */
+
+/* FIX: add IRQ_INPROGRESS,mask,unmask,probing.... */
+
+void q40_irq2_handler (int vec, void *devname, struct pt_regs *fp)
+{
+  /* got level 2 interrupt, dispatch to ISA or keyboard IRQs */
+
+        unsigned mir=master_inb(IIRQ_REG);
+	unsigned mer;
+	int irq,i;
+
+	/*
+	 *  more than 1 bit might be set, must handle atmost 1 int source,
+	 *  - handle only those with explicitly set handler
+	 */
+
+	if ((mir&IRQ_SER_MASK) || (mir&IRQ_EXT_MASK)) 
+	  {
+	    
+	    /* some ISA dev caused the int */
+	    
+	    mer=master_inb(EIRQ_REG);
+	    
+	    for (i=0; eirqs[i].mask; i++)
+	      {
+		if (mer&(eirqs[i].mask)) 
+		  {
+		    irq=eirqs[i].irq;
+		    irq_tab[irq].count++;
+		    if (irq_tab[irq].handler == q40_defhand )
+		      continue; /* ignore uninited INTs :-( */
+		    
+		    irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
+		    return;
+		  }
+	      }
+	    if (ccleirq>0) 
+	      printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer),ccleirq--;
+	  } 
+	else 
+	  {
+	    /* internal */
+
+	    for (i=0; iirqs[i].mask; i++)
+	      {
+		if (mir&(iirqs[i].mask)) 
+		  {
+		    irq=iirqs[i].irq;
+		    irq_tab[irq].count++;
+		    if (irq_tab[irq].handler == q40_defhand )
+		      continue; /* ignore uninited INTs :-( */
+		    
+		    irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
+		    return;
+		  }
+	      }
+	    if (cclirq>0)
+	      printk("internal level 2 interrupt from unknown source ? IIRQ_REG=%x\n",mir),cclirq--;
+	  }
+}
+
+int q40_get_irq_list (char *buf)
+{
+	int i, len = 0;
+
+	for (i = 0; i <= Q40_IRQ_MAX; i++) {
+		if (irq_tab[i].count)
+			len += sprintf (buf+len, "Vec 0x%02x: %8d  %s%s\n",
+			    i, irq_tab[i].count,
+			    irq_tab[i].devname[0] ? irq_tab[i].devname : "?",
+			    irq_tab[i].handler == q40_defhand ? 
+					" (now unassigned)" : "");
+	}
+	return len;
+}
+
+
+static void q40_defhand (int irq, void *dev_id, struct pt_regs *fp)
+{
+#if 0
+	printk ("Unknown q40 interrupt 0x%02x\n", irq);
+#endif
+}
+static void sys_default_handler(int lev, void *dev_id, struct pt_regs *regs)
+{
+#if 0
+        if (ints_inited)
+#endif
+	  printk ("Uninitialised interrupt level %d\n", lev);
+#if 0
+	else
+	  printk ("Interrupt before interrupt initialisation\n");
+#endif
+}
+
+ void (*q40_sys_default_handler[SYS_IRQS]) (int, void *, struct pt_regs *) = {
+   sys_default_handler,sys_default_handler,sys_default_handler,sys_default_handler,
+   sys_default_handler,sys_default_handler,sys_default_handler,sys_default_handler
+ };
+
+void q40_enable_irq (unsigned int irq)
+{
+}
+
+
+void q40_disable_irq (unsigned int irq)
+{
+}
+
+unsigned long q40_probe_irq_on (void)
+{
+  printk("sorry, irq probing not yet implemented - reconfigure the driver to avoid this\n");
+  return 0;
+}
+int q40_probe_irq_off (unsigned long irqs)
+{
+  return -1;
+}