1 files changed, 262 insertions, 120 deletions

diff --git a/arch/m68k/kernel/ints.c b/arch/m68k/kernel/ints.c
index 514d323..5a8344b 100644
--- a/arch/m68k/kernel/ints.c
+++ b/arch/m68k/kernel/ints.c
@@ -39,47 +39,40 @@
 #include <asm/traps.h>
 #include <asm/page.h>
 #include <asm/machdep.h>
+#include <asm/cacheflush.h>
 
 #ifdef CONFIG_Q40
 #include <asm/q40ints.h>
 #endif
 
+extern u32 auto_irqhandler_fixup[];
+extern u32 user_irqhandler_fixup[];
+extern u16 user_irqvec_fixup[];
+
 /* table for system interrupt handlers */
-static irq_handler_t irq_list[SYS_IRQS];
-
-static const char *default_names[SYS_IRQS] = {
-	[0] = "spurious int",
-	[1] = "int1 handler",
-	[2] = "int2 handler",
-	[3] = "int3 handler",
-	[4] = "int4 handler",
-	[5] = "int5 handler",
-	[6] = "int6 handler",
-	[7] = "int7 handler"
+static struct irq_node *irq_list[NR_IRQS];
+static struct irq_controller *irq_controller[NR_IRQS];
+static int irq_depth[NR_IRQS];
+
+static int m68k_first_user_vec;
+
+static struct irq_controller auto_irq_controller = {
+	.name		= "auto",
+	.lock		= SPIN_LOCK_UNLOCKED,
+	.startup	= m68k_irq_startup,
+	.shutdown	= m68k_irq_shutdown,
 };
 
-/* The number of spurious interrupts */
-volatile unsigned int num_spurious;
+static struct irq_controller user_irq_controller = {
+	.name		= "user",
+	.lock		= SPIN_LOCK_UNLOCKED,
+	.startup	= m68k_irq_startup,
+	.shutdown	= m68k_irq_shutdown,
+};
 
 #define NUM_IRQ_NODES 100
 static irq_node_t nodes[NUM_IRQ_NODES];
 
-static void dummy_enable_irq(unsigned int irq);
-static void dummy_disable_irq(unsigned int irq);
-static int dummy_request_irq(unsigned int irq,
-		irqreturn_t (*handler) (int, void *, struct pt_regs *),
-		unsigned long flags, const char *devname, void *dev_id);
-static void dummy_free_irq(unsigned int irq, void *dev_id);
-
-void (*enable_irq) (unsigned int) = dummy_enable_irq;
-void (*disable_irq) (unsigned int) = dummy_disable_irq;
-
-int (*mach_request_irq) (unsigned int, irqreturn_t (*)(int, void *, struct pt_regs *),
-                      unsigned long, const char *, void *) = dummy_request_irq;
-void (*mach_free_irq) (unsigned int, void *) = dummy_free_irq;
-
-void init_irq_proc(void);
-
 /*
  * void init_IRQ(void)
  *
@@ -95,18 +88,76 @@ void __init init_IRQ(void)
 {
 	int i;
 
-	for (i = 0; i < SYS_IRQS; i++) {
-		if (mach_default_handler)
-			irq_list[i].handler = (*mach_default_handler)[i];
-		irq_list[i].flags   = 0;
-		irq_list[i].dev_id  = NULL;
-		irq_list[i].devname = default_names[i];
+	/* assembly irq entry code relies on this... */
+	if (HARDIRQ_MASK != 0x00ff0000) {
+		extern void hardirq_mask_is_broken(void);
+		hardirq_mask_is_broken();
 	}
 
-	for (i = 0; i < NUM_IRQ_NODES; i++)
-		nodes[i].handler = NULL;
+	for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
+		irq_controller[i] = &auto_irq_controller;
+
+	mach_init_IRQ();
+}
+
+/**
+ * m68k_setup_auto_interrupt
+ * @handler: called from auto vector interrupts
+ *
+ * setup the handler to be called from auto vector interrupts instead of the
+ * standard m68k_handle_int(), it will be called with irq numbers in the range
+ * from IRQ_AUTO_1 - IRQ_AUTO_7.
+ */
+void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
+{
+	if (handler)
+		*auto_irqhandler_fixup = (u32)handler;
+	flush_icache();
+}
+
+/**
+ * m68k_setup_user_interrupt
+ * @vec: first user vector interrupt to handle
+ * @cnt: number of active user vector interrupts
+ * @handler: called from user vector interrupts
+ *
+ * setup user vector interrupts, this includes activating the specified range
+ * of interrupts, only then these interrupts can be requested (note: this is
+ * different from auto vector interrupts). An optional handler can be installed
+ * to be called instead of the default m68k_handle_int(), it will be called
+ * with irq numbers starting from IRQ_USER.
+ */
+void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
+				      void (*handler)(unsigned int, struct pt_regs *))
+{
+	int i;
+
+	m68k_first_user_vec = vec;
+	for (i = 0; i < cnt; i++)
+		irq_controller[IRQ_USER + i] = &user_irq_controller;
+	*user_irqvec_fixup = vec - IRQ_USER;
+	if (handler)
+		*user_irqhandler_fixup = (u32)handler;
+	flush_icache();
+}
+
+/**
+ * m68k_setup_irq_controller
+ * @contr: irq controller which controls specified irq
+ * @irq: first irq to be managed by the controller
+ *
+ * Change the controller for the specified range of irq, which will be used to
+ * manage these irq. auto/user irq already have a default controller, which can
+ * be changed as well, but the controller probably should use m68k_irq_startup/
+ * m68k_irq_shutdown.
+ */
+void m68k_setup_irq_controller(struct irq_controller *contr, unsigned int irq,
+			       unsigned int cnt)
+{
+	int i;
 
-	mach_init_IRQ ();
+	for (i = 0; i < cnt; i++)
+		irq_controller[irq + i] = contr;
 }
 
 irq_node_t *new_irq_node(void)
@@ -114,84 +165,183 @@ irq_node_t *new_irq_node(void)
 	irq_node_t *node;
 	short i;
 
-	for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
-		if (!node->handler)
+	for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) {
+		if (!node->handler) {
+			memset(node, 0, sizeof(*node));
 			return node;
+		}
+	}
 
 	printk ("new_irq_node: out of nodes\n");
 	return NULL;
 }
 
-/*
- * We will keep these functions until I have convinced Linus to move
- * the declaration of them from include/linux/sched.h to
- * include/asm/irq.h.
- */
+int setup_irq(unsigned int irq, struct irq_node *node)
+{
+	struct irq_controller *contr;
+	struct irq_node **prev;
+	unsigned long flags;
+
+	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
+		printk("%s: Incorrect IRQ %d from %s\n",
+		       __FUNCTION__, irq, node->devname);
+		return -ENXIO;
+	}
+
+	spin_lock_irqsave(&contr->lock, flags);
+
+	prev = irq_list + irq;
+	if (*prev) {
+		/* Can't share interrupts unless both agree to */
+		if (!((*prev)->flags & node->flags & SA_SHIRQ)) {
+			spin_unlock_irqrestore(&contr->lock, flags);
+			return -EBUSY;
+		}
+		while (*prev)
+			prev = &(*prev)->next;
+	}
+
+	if (!irq_list[irq]) {
+		if (contr->startup)
+			contr->startup(irq);
+		else
+			contr->enable(irq);
+	}
+	node->next = NULL;
+	*prev = node;
+
+	spin_unlock_irqrestore(&contr->lock, flags);
+
+	return 0;
+}
+
 int request_irq(unsigned int irq,
 		irqreturn_t (*handler) (int, void *, struct pt_regs *),
 		unsigned long flags, const char *devname, void *dev_id)
 {
-	return mach_request_irq(irq, handler, flags, devname, dev_id);
+	struct irq_node *node;
+	int res;
+
+	node = new_irq_node();
+	if (!node)
+		return -ENOMEM;
+
+	node->handler = handler;
+	node->flags   = flags;
+	node->dev_id  = dev_id;
+	node->devname = devname;
+
+	res = setup_irq(irq, node);
+	if (res)
+		node->handler = NULL;
+
+	return res;
 }
 
 EXPORT_SYMBOL(request_irq);
 
 void free_irq(unsigned int irq, void *dev_id)
 {
-	mach_free_irq(irq, dev_id);
+	struct irq_controller *contr;
+	struct irq_node **p, *node;
+	unsigned long flags;
+
+	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
+		printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
+		return;
+	}
+
+	spin_lock_irqsave(&contr->lock, flags);
+
+	p = irq_list + irq;
+	while ((node = *p)) {
+		if (node->dev_id == dev_id)
+			break;
+		p = &node->next;
+	}
+
+	if (node) {
+		*p = node->next;
+		node->handler = NULL;
+	} else
+		printk("%s: Removing probably wrong IRQ %d\n",
+		       __FUNCTION__, irq);
+
+	if (!irq_list[irq]) {
+		if (contr->shutdown)
+			contr->shutdown(irq);
+		else
+			contr->disable(irq);
+	}
+
+	spin_unlock_irqrestore(&contr->lock, flags);
 }
 
 EXPORT_SYMBOL(free_irq);
 
-int cpu_request_irq(unsigned int irq,
-                    irqreturn_t (*handler)(int, void *, struct pt_regs *),
-                    unsigned long flags, const char *devname, void *dev_id)
+void enable_irq(unsigned int irq)
 {
-	if (irq < IRQ1 || irq > IRQ7) {
-		printk("%s: Incorrect IRQ %d from %s\n",
-		       __FUNCTION__, irq, devname);
-		return -ENXIO;
-	}
+	struct irq_controller *contr;
+	unsigned long flags;
 
-#if 0
-	if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
-		if (irq_list[irq].flags & IRQ_FLG_LOCK) {
-			printk("%s: IRQ %d from %s is not replaceable\n",
-			       __FUNCTION__, irq, irq_list[irq].devname);
-			return -EBUSY;
-		}
-		if (!(flags & IRQ_FLG_REPLACE)) {
-			printk("%s: %s can't replace IRQ %d from %s\n",
-			       __FUNCTION__, devname, irq, irq_list[irq].devname);
-			return -EBUSY;
-		}
+	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
+		printk("%s: Incorrect IRQ %d\n",
+		       __FUNCTION__, irq);
+		return;
 	}
-#endif
 
-	irq_list[irq].handler = handler;
-	irq_list[irq].flags   = flags;
-	irq_list[irq].dev_id  = dev_id;
-	irq_list[irq].devname = devname;
-	return 0;
+	spin_lock_irqsave(&contr->lock, flags);
+	if (irq_depth[irq]) {
+		if (!--irq_depth[irq]) {
+			if (contr->enable)
+				contr->enable(irq);
+		}
+	} else
+		WARN_ON(1);
+	spin_unlock_irqrestore(&contr->lock, flags);
 }
 
-void cpu_free_irq(unsigned int irq, void *dev_id)
+EXPORT_SYMBOL(enable_irq);
+
+void disable_irq(unsigned int irq)
 {
-	if (irq < IRQ1 || irq > IRQ7) {
-		printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
+	struct irq_controller *contr;
+	unsigned long flags;
+
+	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
+		printk("%s: Incorrect IRQ %d\n",
+		       __FUNCTION__, irq);
 		return;
 	}
 
-	if (irq_list[irq].dev_id != dev_id)
-		printk("%s: Removing probably wrong IRQ %d from %s\n",
-		       __FUNCTION__, irq, irq_list[irq].devname);
+	spin_lock_irqsave(&contr->lock, flags);
+	if (!irq_depth[irq]++) {
+		if (contr->disable)
+			contr->disable(irq);
+	}
+	spin_unlock_irqrestore(&contr->lock, flags);
+}
 
-	irq_list[irq].handler = (*mach_default_handler)[irq];
-	irq_list[irq].flags   = 0;
-	irq_list[irq].dev_id  = NULL;
-	irq_list[irq].devname = default_names[irq];
+EXPORT_SYMBOL(disable_irq);
+
+int m68k_irq_startup(unsigned int irq)
+{
+	if (irq <= IRQ_AUTO_7)
+		vectors[VEC_SPUR + irq] = auto_inthandler;
+	else
+		vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
+	return 0;
 }
 
+void m68k_irq_shutdown(unsigned int irq)
+{
+	if (irq <= IRQ_AUTO_7)
+		vectors[VEC_SPUR + irq] = bad_inthandler;
+	else
+		vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
+}
+
+
 /*
  * Do we need these probe functions on the m68k?
  *
@@ -219,58 +369,50 @@ int probe_irq_off (unsigned long irqs)
 
 EXPORT_SYMBOL(probe_irq_off);
 
-static void dummy_enable_irq(unsigned int irq)
-{
-	printk("calling uninitialized enable_irq()\n");
-}
-
-static void dummy_disable_irq(unsigned int irq)
+unsigned int irq_canonicalize(unsigned int irq)
 {
-	printk("calling uninitialized disable_irq()\n");
+#ifdef CONFIG_Q40
+	if (MACH_IS_Q40 && irq == 11)
+		irq = 10;
+#endif
+	return irq;
 }
 
-static int dummy_request_irq(unsigned int irq,
-		irqreturn_t (*handler) (int, void *, struct pt_regs *),
-		unsigned long flags, const char *devname, void *dev_id)
-{
-	printk("calling uninitialized request_irq()\n");
-	return 0;
-}
+EXPORT_SYMBOL(irq_canonicalize);
 
-static void dummy_free_irq(unsigned int irq, void *dev_id)
+asmlinkage void m68k_handle_int(unsigned int irq, struct pt_regs *regs)
 {
-	printk("calling uninitialized disable_irq()\n");
+	struct irq_node *node;
+
+	kstat_cpu(0).irqs[irq]++;
+	node = irq_list[irq];
+	do {
+		node->handler(irq, node->dev_id, regs);
+		node = node->next;
+	} while (node);
 }
 
-asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
+asmlinkage void handle_badint(struct pt_regs *regs)
 {
-	if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
-		vec -= VEC_SPUR;
-		kstat_cpu(0).irqs[vec]++;
-		irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
-	} else {
-		if (mach_process_int)
-			mach_process_int(vec, fp);
-		else
-			panic("Can't process interrupt vector %ld\n", vec);
-		return;
-	}
+	kstat_cpu(0).irqs[0]++;
+	printk("unexpected interrupt from %u\n", regs->vector);
 }
 
 int show_interrupts(struct seq_file *p, void *v)
 {
+	struct irq_controller *contr;
+	struct irq_node *node;
 	int i = *(loff_t *) v;
 
 	/* autovector interrupts */
-	if (i < SYS_IRQS) {
-		if (mach_default_handler) {
-			seq_printf(p, "auto %2d: %10u ", i,
-			               i ? kstat_cpu(0).irqs[i] : num_spurious);
-			seq_puts(p, "  ");
-			seq_printf(p, "%s\n", irq_list[i].devname);
-		}
-	} else if (i == SYS_IRQS)
-		mach_get_irq_list(p, v);
+	if (irq_list[i]) {
+		contr = irq_controller[i];
+		node = irq_list[i];
+		seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
+		while ((node = node->next))
+			seq_printf(p, ", %s", node->devname);
+		seq_puts(p, "\n");
+	}
 	return 0;
 }