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 000000000000..f8ecc2664fe6
--- /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:
+ */