[PATCH] m68k: convert q40 irq code

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 168 insertions, 296 deletions

diff --git a/arch/m68k/q40/q40ints.c b/arch/m68k/q40/q40ints.c
index ff80cba110d4..472f41c4158b 100644
--- a/arch/m68k/q40/q40ints.c
+++ b/arch/m68k/q40/q40ints.c
@@ -14,13 +14,8 @@
 #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>
@@ -39,28 +34,37 @@
  *
 */
 
-extern int ints_inited;
+static void q40_irq_handler(unsigned int, struct pt_regs *fp);
+static void q40_enable_irq(unsigned int);
+static void q40_disable_irq(unsigned int);
 
+unsigned short q40_ablecount[35];
+unsigned short q40_state[35];
 
-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);
-
-
-#define DEVNAME_SIZE 24
+static int q40_irq_startup(unsigned int irq)
+{
+        /* test for ISA ints not implemented by HW */
+        switch (irq) {
+        case 1: case 2: case 8: case 9:
+        case 11: case 12: case 13:
+                printk("%s: ISA IRQ %d not implemented by HW\n", __FUNCTION__, irq);
+                return -ENXIO;
+        }
+        return 0;
+}
 
-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];
+static void q40_irq_shutdown(unsigned int irq)
+{
+}
 
-short unsigned q40_ablecount[Q40_IRQ_MAX+1];
+static struct irq_controller q40_irq_controller = {
+        .name           = "q40",
+        .lock           = SPIN_LOCK_UNLOCKED,
+        .startup        = q40_irq_startup,
+        .shutdown       = q40_irq_shutdown,
+        .enable         = q40_enable_irq,
+        .disable        = q40_disable_irq,
+};
 
 /*
  * void q40_init_IRQ (void)
@@ -73,139 +77,29 @@ short unsigned q40_ablecount[Q40_IRQ_MAX+1];
  * the q40 IRQ handling routines.
  */
 
-static int disabled=0;
+static int disabled;
 
-void q40_init_IRQ (void)
+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 */
-        }
+        m68k_setup_irq_controller(&q40_irq_controller, 1, Q40_IRQ_MAX);
 
         /* setup handler for ISA ints */
-        cpu_request_irq(IRQ_AUTO_2, q40_irq2_handler, 0,
-                        "q40 ISA and master chip", NULL);
+        m68k_setup_auto_interrupt(q40_irq_handler);
+
+        m68k_irq_startup(IRQ_AUTO_2);
+        m68k_irq_startup(IRQ_AUTO_4);
 
         /* now enable some ints.. */
-        master_outb(1,EXT_ENABLE_REG);  /* ISA IRQ 5-15 */
+        master_outb(1, EXT_ENABLE_REG);  /* ISA IRQ 5-15 */
 
         /* make sure keyboard IRQ is disabled */
-        master_outb(0,KEY_IRQ_ENABLE_REG);
+        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;
@@ -214,54 +108,53 @@ static int sound_ticks;
 
 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;
+        /* 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;
+        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;
+        int timer_irq;
 
-    q40_timer_routine = timer_routine;
-    timer_irq=Q40_IRQ_FRAME;
+        q40_timer_routine = timer_routine;
+        timer_irq = Q40_IRQ_FRAME;
 
-    if (request_irq(timer_irq, q40_timer_int, 0,
+        if (request_irq(timer_irq, q40_timer_int, 0,
                                 "timer", q40_timer_int))
-        panic ("Couldn't register timer int");
+                panic("Couldn't register timer int");
 
-    master_outb(-1,FRAME_CLEAR_REG);
-    master_outb( 1,FRAME_RATE_REG);
+        master_outb(-1, FRAME_CLEAR_REG);
+        master_outb( 1, FRAME_RATE_REG);
 }
 
 
@@ -307,153 +200,132 @@ 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)
+/* got interrupt, dispatch to ISA or keyboard/timer IRQs */
+static void q40_irq_handler(unsigned int irq, struct pt_regs *fp)
 {
-  unsigned mir, mer;
-  int irq,i;
+        unsigned mir, mer;
+        int 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;
+        mir = master_inb(IIRQ_REG);
+#ifdef CONFIG_BLK_DEV_FD
+        if ((mir & Q40_IRQ_EXT_MASK) &&
+            (master_inb(EIRQ_REG) & Q40_IRQ6_MASK)) {
+                floppy_hardint();
+                return;
+        }
+#endif
+        switch (irq) {
+        case 4:
+        case 6:
+                m68k_handle_int(Q40_IRQ_SAMPLE, fp);
+                return;
+        }
+        if (mir & Q40_IRQ_FRAME_MASK) {
+                m68k_handle_int(Q40_IRQ_FRAME, 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 */
+                                if (irq > 4 && irq <= 15 && mext_disabled) {
+                                        /*aliased_irq++;*/
+                                        goto iirq;
+                                }
+                                if (q40_state[irq] & 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;
+                                        /* 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;
+                                        /*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 ) {
+                                        goto iirq;
+                                }
+                                q40_state[irq] |= IRQ_INPROGRESS;
+                                m68k_handle_int(irq, fp);
+                                q40_state[irq] &= ~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);}
+                                        if (irq > 4) {
+                                                disabled = 0;
+                                                enable_irq(irq);
+                                        }
 #else
-                                  disabled=0;
-                                  /*printk("reenabling irq %d\n",irq); */
+                                        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;
+                        }
+                }
+                if (mer && ccleirq > 0 && !aliased_irq) {
+                        printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer);
+                        ccleirq--;
+                }
         }
-        return 0;
-}
-
+ iirq:
+        mir = master_inb(IIRQ_REG);
+        /* should test whether keyboard irq is really enabled, doing it in defhand */
+        if (mir & Q40_IRQ_KEYB_MASK)
+                m68k_handle_int(Q40_IRQ_KEYBOARD, fp);
 
-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;
+        return;
 }
 
-
-void q40_enable_irq (unsigned int irq)
+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);
-    }
+        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)
+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);
-  }
+        /* 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)
+unsigned long q40_probe_irq_on(void)
 {
-  printk("irq probing not working - reconfigure the driver to avoid this\n");
-  return -1;
+        printk("irq probing not working - reconfigure the driver to avoid this\n");
+        return -1;
 }
-int q40_probe_irq_off (unsigned long irqs)
+int q40_probe_irq_off(unsigned long irqs)
 {
-  return -1;
+        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:
- */