sh: Simplify "multi-evt" interrupt handling.

This patch changes the way in which "multi-evt" interrups are handled.
The intc_evt2irq_table and related intc_evt2irq() have been removed and
the "redirecting" handler is installed for the coupled interrupts.

Thanks to that the do_IRQ() function don't have to use another level
of indirection for all the interrupts...

Signed-off-by: Pawel Moll <pawel.moll@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 18 insertions, 39 deletions

diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 278c68c60488..d1053392e287 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -114,7 +114,7 @@ asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs)
 #endif
 
         irq_enter();
-        irq = irq_demux(intc_evt2irq(irq));
+        irq = irq_demux(evt2irq(irq));
 
 #ifdef CONFIG_IRQSTACKS
         curctx = (union irq_ctx *)current_thread_info();
diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index 4b1ca9d28353..a9174ec72853 100644
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -663,16 +663,9 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
         return 0;
 }
 
-static unsigned char *intc_evt2irq_table;
-
-unsigned int intc_evt2irq(unsigned int vector)
+static void intc_redirect_irq(unsigned int irq, struct irq_desc *desc)
 {
-        unsigned int irq = evt2irq(vector);
-
-        if (intc_evt2irq_table && intc_evt2irq_table[irq])
-                irq = intc_evt2irq_table[irq];
-
-        return irq;
+        generic_handle_irq((unsigned int)get_irq_data(irq));
 }
 
 void __init register_intc_controller(struct intc_desc *desc)
@@ -745,34 +738,6 @@ void __init register_intc_controller(struct intc_desc *desc)
 
         BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
 
-        /* keep the first vector only if same enum is used multiple times */
-        for (i = 0; i < desc->nr_vectors; i++) {
-                struct intc_vect *vect = desc->vectors + i;
-                int first_irq = evt2irq(vect->vect);
-
-                if (!vect->enum_id)
-                        continue;
-
-                for (k = i + 1; k < desc->nr_vectors; k++) {
-                        struct intc_vect *vect2 = desc->vectors + k;
-
-                        if (vect->enum_id != vect2->enum_id)
-                                continue;
-
-                        vect2->enum_id = 0;
-
-                        if (!intc_evt2irq_table)
-                                intc_evt2irq_table = kzalloc(NR_IRQS, GFP_NOWAIT);
-
-                        if (!intc_evt2irq_table) {
-                                pr_warning("intc: cannot allocate evt2irq!\n");
-                                continue;
-                        }
-
-                        intc_evt2irq_table[evt2irq(vect2->vect)] = first_irq;
-                }
-        }
-
         /* register the vectors one by one */
         for (i = 0; i < desc->nr_vectors; i++) {
                 struct intc_vect *vect = desc->vectors + i;
@@ -789,6 +754,21 @@ void __init register_intc_controller(struct intc_desc *desc)
                 }
 
                 intc_register_irq(desc, d, vect->enum_id, irq);
+
+                for (k = i + 1; k < desc->nr_vectors; k++) {
+                        struct intc_vect *vect2 = desc->vectors + k;
+                        unsigned int irq2 = evt2irq(vect2->vect);
+
+                        if (vect->enum_id != vect2->enum_id)
+                                continue;
+
+                        vect2->enum_id = 0;
+
+                        /* redirect this interrupts to the first one */
+                        set_irq_chip_and_handler_name(irq2, &d->chip,
+                                        intc_redirect_irq, "redirect");
+                        set_irq_data(irq2, (void *)irq);
+                }
         }
 }
 
diff --git a/include/linux/sh_intc.h b/include/linux/sh_intc.h
index eb1423a0078d..68e212ff9dde 100644
--- a/include/linux/sh_intc.h
+++ b/include/linux/sh_intc.h
@@ -85,7 +85,6 @@ struct intc_desc symbol __initdata = {					\
 }
 #endif
 
-unsigned int intc_evt2irq(unsigned int vector);
 void __init register_intc_controller(struct intc_desc *desc);
 int intc_set_priority(unsigned int irq, unsigned int prio);