1 files changed, 111 insertions, 383 deletions

diff --git a/arch/sparc/kernel/irq_32.c b/arch/sparc/kernel/irq_32.c
index b2dbb4ba860..197e1ba8548 100644
--- a/arch/sparc/kernel/irq_32.c
+++ b/arch/sparc/kernel/irq_32.c
@@ -15,6 +15,7 @@
 #include <linux/seq_file.h>
 
 #include <asm/cacheflush.h>
+#include <asm/cpudata.h>
 #include <asm/pcic.h>
 #include <asm/leon.h>
 
@@ -101,284 +102,163 @@ EXPORT_SYMBOL(arch_local_irq_restore);
  * directed CPU interrupts using the existing enable/disable irq code
  * with tweaks.
  *
+ * Sun4d complicates things even further.  IRQ numbers are arbitrary
+ * 32-bit values in that case.  Since this is similar to sparc64,
+ * we adopt a virtual IRQ numbering scheme as is done there.
+ * Virutal interrupt numbers are allocated by build_irq().  So NR_IRQS
+ * just becomes a limit of how many interrupt sources we can handle in
+ * a single system.  Even fully loaded SS2000 machines top off at
+ * about 32 interrupt sources or so, therefore a NR_IRQS value of 64
+ * is more than enough.
+  *
+ * We keep a map of per-PIL enable interrupts.  These get wired
+ * up via the irq_chip->startup() method which gets invoked by
+ * the generic IRQ layer during request_irq().
  */
 
 
+/* Table of allocated irqs. Unused entries has irq == 0 */
+static struct irq_bucket irq_table[NR_IRQS];
+/* Protect access to irq_table */
+static DEFINE_SPINLOCK(irq_table_lock);
 
-/*
- * Dave Redman (djhr@tadpole.co.uk)
- *
- * There used to be extern calls and hard coded values here.. very sucky!
- * instead, because some of the devices attach very early, I do something
- * equally sucky but at least we'll never try to free statically allocated
- * space or call kmalloc before kmalloc_init :(.
- *
- * In fact it's the timer10 that attaches first.. then timer14
- * then kmalloc_init is called.. then the tty interrupts attach.
- * hmmm....
- *
- */
-#define MAX_STATIC_ALLOC	4
-struct irqaction static_irqaction[MAX_STATIC_ALLOC];
-int static_irq_count;
-
-static struct {
-	struct irqaction *action;
-	int flags;
-} sparc_irq[NR_IRQS];
-#define SPARC_IRQ_INPROGRESS 1
-
-/* Used to protect the IRQ action lists */
-DEFINE_SPINLOCK(irq_action_lock);
+/* Map between the irq identifier used in hw to the irq_bucket. */
+struct irq_bucket *irq_map[SUN4D_MAX_IRQ];
+/* Protect access to irq_map */
+static DEFINE_SPINLOCK(irq_map_lock);
 
-int show_interrupts(struct seq_file *p, void *v)
+/* Allocate a new irq from the irq_table */
+unsigned int irq_alloc(unsigned int real_irq, unsigned int pil)
 {
-	int i = *(loff_t *)v;
-	struct irqaction *action;
 	unsigned long flags;
-#ifdef CONFIG_SMP
-	int j;
-#endif
+	unsigned int i;
+
+	spin_lock_irqsave(&irq_table_lock, flags);
+	for (i = 1; i < NR_IRQS; i++) {
+		if (irq_table[i].real_irq == real_irq && irq_table[i].pil == pil)
+			goto found;
+	}
 
-	if (sparc_cpu_model == sun4d)
-		return show_sun4d_interrupts(p, v);
+	for (i = 1; i < NR_IRQS; i++) {
+		if (!irq_table[i].irq)
+			break;
+	}
 
-	spin_lock_irqsave(&irq_action_lock, flags);
 	if (i < NR_IRQS) {
-		action = sparc_irq[i].action;
-		if (!action)
-			goto out_unlock;
-		seq_printf(p, "%3d: ", i);
-#ifndef CONFIG_SMP
-		seq_printf(p, "%10u ", kstat_irqs(i));
-#else
-		for_each_online_cpu(j) {
-			seq_printf(p, "%10u ",
-				    kstat_cpu(j).irqs[i]);
-		}
-#endif
-		seq_printf(p, " %c %s",
-			(action->flags & IRQF_DISABLED) ? '+' : ' ',
-			action->name);
-		for (action = action->next; action; action = action->next) {
-			seq_printf(p, ",%s %s",
-				(action->flags & IRQF_DISABLED) ? " +" : "",
-				action->name);
-		}
-		seq_putc(p, '\n');
+		irq_table[i].real_irq = real_irq;
+		irq_table[i].irq = i;
+		irq_table[i].pil = pil;
+	} else {
+		printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
+		i = 0;
 	}
-out_unlock:
-	spin_unlock_irqrestore(&irq_action_lock, flags);
-	return 0;
+found:
+	spin_unlock_irqrestore(&irq_table_lock, flags);
+
+	return i;
 }
 
-void free_irq(unsigned int irq, void *dev_id)
+/* Based on a single pil handler_irq may need to call several
+ * interrupt handlers. Use irq_map as entry to irq_table,
+ * and let each entry in irq_table point to the next entry.
+ */
+void irq_link(unsigned int irq)
 {
-	struct irqaction *action;
-	struct irqaction **actionp;
+	struct irq_bucket *p;
 	unsigned long flags;
-	unsigned int cpu_irq;
+	unsigned int pil;
 
-	if (sparc_cpu_model == sun4d) {
-		sun4d_free_irq(irq, dev_id);
-		return;
-	}
-	cpu_irq = irq & (NR_IRQS - 1);
-	if (cpu_irq > 14) {  /* 14 irq levels on the sparc */
-		printk(KERN_ERR "Trying to free bogus IRQ %d\n", irq);
-		return;
-	}
+	BUG_ON(irq >= NR_IRQS);
 
-	spin_lock_irqsave(&irq_action_lock, flags);
+	spin_lock_irqsave(&irq_map_lock, flags);
 
-	actionp = &sparc_irq[cpu_irq].action;
-	action = *actionp;
+	p = &irq_table[irq];
+	pil = p->pil;
+	BUG_ON(pil > SUN4D_MAX_IRQ);
+	p->next = irq_map[pil];
+	irq_map[pil] = p;
 
-	if (!action->handler) {
-		printk(KERN_ERR "Trying to free free IRQ%d\n", irq);
-		goto out_unlock;
-	}
-	if (dev_id) {
-		for (; action; action = action->next) {
-			if (action->dev_id == dev_id)
-				break;
-			actionp = &action->next;
-		}
-		if (!action) {
-			printk(KERN_ERR "Trying to free free shared IRQ%d\n",
-			       irq);
-			goto out_unlock;
-		}
-	} else if (action->flags & IRQF_SHARED) {
-		printk(KERN_ERR "Trying to free shared IRQ%d with NULL device ID\n",
-		       irq);
-		goto out_unlock;
-	}
-	if (action->flags & SA_STATIC_ALLOC) {
-		/*
-		 * This interrupt is marked as specially allocated
-		 * so it is a bad idea to free it.
-		 */
-		printk(KERN_ERR "Attempt to free statically allocated IRQ%d (%s)\n",
-		       irq, action->name);
-		goto out_unlock;
-	}
-
-	*actionp = action->next;
-
-	spin_unlock_irqrestore(&irq_action_lock, flags);
+	spin_unlock_irqrestore(&irq_map_lock, flags);
+}
 
-	synchronize_irq(irq);
+void irq_unlink(unsigned int irq)
+{
+	struct irq_bucket *p, **pnext;
+	unsigned long flags;
 
-	spin_lock_irqsave(&irq_action_lock, flags);
+	BUG_ON(irq >= NR_IRQS);
 
-	kfree(action);
+	spin_lock_irqsave(&irq_map_lock, flags);
 
-	if (!sparc_irq[cpu_irq].action)
-		__disable_irq(irq);
+	p = &irq_table[irq];
+	BUG_ON(p->pil > SUN4D_MAX_IRQ);
+	pnext = &irq_map[p->pil];
+	while (*pnext != p)
+		pnext = &(*pnext)->next;
+	*pnext = p->next;
 
-out_unlock:
-	spin_unlock_irqrestore(&irq_action_lock, flags);
+	spin_unlock_irqrestore(&irq_map_lock, flags);
 }
-EXPORT_SYMBOL(free_irq);
 
-/*
- * This is called when we want to synchronize with
- * interrupts. We may for example tell a device to
- * stop sending interrupts: but to make sure there
- * are no interrupts that are executing on another
- * CPU we need to call this function.
- */
-#ifdef CONFIG_SMP
-void synchronize_irq(unsigned int irq)
-{
-	unsigned int cpu_irq;
 
-	cpu_irq = irq & (NR_IRQS - 1);
-	while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
-		cpu_relax();
-}
-EXPORT_SYMBOL(synchronize_irq);
-#endif /* SMP */
-
-void unexpected_irq(int irq, void *dev_id, struct pt_regs *regs)
+/* /proc/interrupts printing */
+int arch_show_interrupts(struct seq_file *p, int prec)
 {
-	int i;
-	struct irqaction *action;
-	unsigned int cpu_irq;
+	int j;
 
-	cpu_irq = irq & (NR_IRQS - 1);
-	action = sparc_irq[cpu_irq].action;
-
-	printk(KERN_ERR "IO device interrupt, irq = %d\n", irq);
-	printk(KERN_ERR "PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc,
-		    regs->npc, regs->u_regs[14]);
-	if (action) {
-		printk(KERN_ERR "Expecting: ");
-		for (i = 0; i < 16; i++)
-			if (action->handler)
-				printk(KERN_CONT "[%s:%d:0x%x] ", action->name,
-				       i, (unsigned int)action->handler);
-	}
-	printk(KERN_ERR "AIEEE\n");
-	panic("bogus interrupt received");
+	seq_printf(p, "NMI: ");
+	for_each_online_cpu(j)
+		seq_printf(p, "%10u ", cpu_data(j).counter);
+	seq_printf(p, "     Non-maskable interrupts\n");
+	return 0;
 }
 
-void handler_irq(int pil, struct pt_regs *regs)
+void handler_irq(unsigned int pil, struct pt_regs *regs)
 {
 	struct pt_regs *old_regs;
-	struct irqaction *action;
-	int cpu = smp_processor_id();
+	struct irq_bucket *p;
 
+	BUG_ON(pil > 15);
 	old_regs = set_irq_regs(regs);
 	irq_enter();
-	disable_pil_irq(pil);
-#ifdef CONFIG_SMP
-	/* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */
-	if ((sparc_cpu_model==sun4m) && (pil < 10))
-		smp4m_irq_rotate(cpu);
-#endif
-	action = sparc_irq[pil].action;
-	sparc_irq[pil].flags |= SPARC_IRQ_INPROGRESS;
-	kstat_cpu(cpu).irqs[pil]++;
-	do {
-		if (!action || !action->handler)
-			unexpected_irq(pil, NULL, regs);
-		action->handler(pil, action->dev_id);
-		action = action->next;
-	} while (action);
-	sparc_irq[pil].flags &= ~SPARC_IRQ_INPROGRESS;
-	enable_pil_irq(pil);
+
+	p = irq_map[pil];
+	while (p) {
+		struct irq_bucket *next = p->next;
+
+		generic_handle_irq(p->irq);
+		p = next;
+	}
 	irq_exit();
 	set_irq_regs(old_regs);
 }
 
 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
+static unsigned int floppy_irq;
 
-/*
- * Fast IRQs on the Sparc can only have one routine attached to them,
- * thus no sharing possible.
- */
-static int request_fast_irq(unsigned int irq,
-			    void (*handler)(void),
-			    unsigned long irqflags, const char *devname)
+int sparc_floppy_request_irq(unsigned int irq, irq_handler_t irq_handler)
 {
-	struct irqaction *action;
-	unsigned long flags;
 	unsigned int cpu_irq;
-	int ret;
+	int err;
+
 #if defined CONFIG_SMP && !defined CONFIG_SPARC_LEON
 	struct tt_entry *trap_table;
 #endif
-	cpu_irq = irq & (NR_IRQS - 1);
-	if (cpu_irq > 14) {
-		ret = -EINVAL;
-		goto out;
-	}
-	if (!handler) {
-		ret = -EINVAL;
-		goto out;
-	}
 
-	spin_lock_irqsave(&irq_action_lock, flags);
+	err = request_irq(irq, irq_handler, 0, "floppy", NULL);
+	if (err)
+		return -1;
 
-	action = sparc_irq[cpu_irq].action;
-	if (action) {
-		if (action->flags & IRQF_SHARED)
-			panic("Trying to register fast irq when already shared.\n");
-		if (irqflags & IRQF_SHARED)
-			panic("Trying to register fast irq as shared.\n");
+	/* Save for later use in floppy interrupt handler */
+	floppy_irq = irq;
 
-		/* Anyway, someone already owns it so cannot be made fast. */
-		printk(KERN_ERR "request_fast_irq: Trying to register yet already owned.\n");
-		ret = -EBUSY;
-		goto out_unlock;
-	}
-
-	/*
-	 * If this is flagged as statically allocated then we use our
-	 * private struct which is never freed.
-	 */
-	if (irqflags & SA_STATIC_ALLOC) {
-		if (static_irq_count < MAX_STATIC_ALLOC)
-			action = &static_irqaction[static_irq_count++];
-		else
-			printk(KERN_ERR "Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
-			       irq, devname);
-	}
-
-	if (action == NULL)
-		action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
-	if (!action) {
-		ret = -ENOMEM;
-		goto out_unlock;
-	}
+	cpu_irq = (irq & (NR_IRQS - 1));
 
 	/* Dork with trap table if we get this far. */
 #define INSTANTIATE(table) \
 	table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \
 	table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \
-		SPARC_BRANCH((unsigned long) handler, \
+		SPARC_BRANCH((unsigned long) floppy_hardint, \
 			     (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\
 	table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \
 	table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP;
@@ -399,22 +279,9 @@ static int request_fast_irq(unsigned int irq,
 	 * writing we have no CPU-neutral interface to fine-grained flushes.
 	 */
 	flush_cache_all();
-
-	action->flags = irqflags;
-	action->name = devname;
-	action->dev_id = NULL;
-	action->next = NULL;
-
-	sparc_irq[cpu_irq].action = action;
-
-	__enable_irq(irq);
-
-	ret = 0;
-out_unlock:
-	spin_unlock_irqrestore(&irq_action_lock, flags);
-out:
-	return ret;
+	return 0;
 }
+EXPORT_SYMBOL(sparc_floppy_request_irq);
 
 /*
  * These variables are used to access state from the assembler
@@ -440,154 +307,23 @@ EXPORT_SYMBOL(pdma_base);
 unsigned long pdma_areasize;
 EXPORT_SYMBOL(pdma_areasize);
 
-static irq_handler_t floppy_irq_handler;
-
+/* Use the generic irq support to call floppy_interrupt
+ * which was setup using request_irq() in sparc_floppy_request_irq().
+ * We only have one floppy interrupt so we do not need to check
+ * for additional handlers being wired up by irq_link()
+ */
 void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
 {
 	struct pt_regs *old_regs;
-	int cpu = smp_processor_id();
 
 	old_regs = set_irq_regs(regs);
-	disable_pil_irq(irq);
 	irq_enter();
-	kstat_cpu(cpu).irqs[irq]++;
-	floppy_irq_handler(irq, dev_id);
+	generic_handle_irq(floppy_irq);
 	irq_exit();
-	enable_pil_irq(irq);
 	set_irq_regs(old_regs);
-	/*
-	 * XXX Eek, it's totally changed with preempt_count() and such
-	 * if (softirq_pending(cpu))
-	 *	do_softirq();
-	 */
 }
-
-int sparc_floppy_request_irq(int irq, unsigned long flags,
-			     irq_handler_t irq_handler)
-{
-	floppy_irq_handler = irq_handler;
-	return request_fast_irq(irq, floppy_hardint, flags, "floppy");
-}
-EXPORT_SYMBOL(sparc_floppy_request_irq);
-
 #endif
 
-int request_irq(unsigned int irq,
-		irq_handler_t handler,
-		unsigned long irqflags, const char *devname, void *dev_id)
-{
-	struct irqaction *action, **actionp;
-	unsigned long flags;
-	unsigned int cpu_irq;
-	int ret;
-
-	if (sparc_cpu_model == sun4d)
-		return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
-
-	cpu_irq = irq & (NR_IRQS - 1);
-	if (cpu_irq > 14) {
-		ret = -EINVAL;
-		goto out;
-	}
-	if (!handler) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	spin_lock_irqsave(&irq_action_lock, flags);
-
-	actionp = &sparc_irq[cpu_irq].action;
-	action = *actionp;
-	if (action) {
-		if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) {
-			ret = -EBUSY;
-			goto out_unlock;
-		}
-		if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) {
-			printk(KERN_ERR "Attempt to mix fast and slow interrupts on IRQ%d denied\n",
-			       irq);
-			ret = -EBUSY;
-			goto out_unlock;
-		}
-		for ( ; action; action = *actionp)
-			actionp = &action->next;
-	}
-
-	/* If this is flagged as statically allocated then we use our
-	 * private struct which is never freed.
-	 */
-	if (irqflags & SA_STATIC_ALLOC) {
-		if (static_irq_count < MAX_STATIC_ALLOC)
-			action = &static_irqaction[static_irq_count++];
-		else
-			printk(KERN_ERR "Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
-			       irq, devname);
-	}
-	if (action == NULL)
-		action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
-	if (!action) {
-		ret = -ENOMEM;
-		goto out_unlock;
-	}
-
-	action->handler = handler;
-	action->flags = irqflags;
-	action->name = devname;
-	action->next = NULL;
-	action->dev_id = dev_id;
-
-	*actionp = action;
-
-	__enable_irq(irq);
-
-	ret = 0;
-out_unlock:
-	spin_unlock_irqrestore(&irq_action_lock, flags);
-out:
-	return ret;
-}
-EXPORT_SYMBOL(request_irq);
-
-void disable_irq_nosync(unsigned int irq)
-{
-	__disable_irq(irq);
-}
-EXPORT_SYMBOL(disable_irq_nosync);
-
-void disable_irq(unsigned int irq)
-{
-	__disable_irq(irq);
-}
-EXPORT_SYMBOL(disable_irq);
-
-void enable_irq(unsigned int irq)
-{
-	__enable_irq(irq);
-}
-EXPORT_SYMBOL(enable_irq);
-
-/*
- * We really don't need these at all on the Sparc.  We only have
- * stubs here because they are exported to modules.
- */
-unsigned long probe_irq_on(void)
-{
-	return 0;
-}
-EXPORT_SYMBOL(probe_irq_on);
-
-int probe_irq_off(unsigned long mask)
-{
-	return 0;
-}
-EXPORT_SYMBOL(probe_irq_off);
-
-static unsigned int build_device_irq(struct platform_device *op,
-                                     unsigned int real_irq)
-{
-	return real_irq;
-}
-
 /* djhr
  * This could probably be made indirect too and assigned in the CPU
  * bits of the code. That would be much nicer I think and would also
@@ -598,8 +334,6 @@ static unsigned int build_device_irq(struct platform_device *op,
 
 void __init init_IRQ(void)
 {
-	sparc_irq_config.build_device_irq = build_device_irq;
-
 	switch (sparc_cpu_model) {
 	case sun4c:
 	case sun4:
@@ -629,9 +363,3 @@ void __init init_IRQ(void)
 	btfixup();
 }
 
-#ifdef CONFIG_PROC_FS
-void init_irq_proc(void)
-{
-	/* For now, nothing... */
-}
-#endif /* CONFIG_PROC_FS */