powerpc/cpm2_pic: Allow correct flow_types for port C interrupts

Port C interrupts can be either falling edge, or either edge.
Other external interrupts are either falling edge or active low.
Tested on a custom 8280 based board.

Signed-off-by: Mark Ware <mware@elphinstone.net>
Acked-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 21 insertions, 7 deletions

diff --git a/arch/powerpc/sysdev/cpm2_pic.c b/arch/powerpc/sysdev/cpm2_pic.c
index 971483f0dfac..1709ac5aac7c 100644
--- a/arch/powerpc/sysdev/cpm2_pic.c
+++ b/arch/powerpc/sysdev/cpm2_pic.c
@@ -143,13 +143,23 @@ static int cpm2_set_irq_type(unsigned int virq, unsigned int flow_type)
         struct irq_desc *desc = irq_to_desc(virq);
         unsigned int vold, vnew, edibit;
 
-        if (flow_type == IRQ_TYPE_NONE)
-                flow_type = IRQ_TYPE_LEVEL_LOW;
-
-        if (flow_type & IRQ_TYPE_EDGE_RISING) {
-                printk(KERN_ERR "CPM2 PIC: sense type 0x%x not supported\n",
-                        flow_type);
-                return -EINVAL;
+        /* Port C interrupts are either IRQ_TYPE_EDGE_FALLING or
+         * IRQ_TYPE_EDGE_BOTH (default).  All others are IRQ_TYPE_EDGE_FALLING
+         * or IRQ_TYPE_LEVEL_LOW (default)
+         */
+        if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) {
+                if (flow_type == IRQ_TYPE_NONE)
+                        flow_type = IRQ_TYPE_EDGE_BOTH;
+
+                if (flow_type != IRQ_TYPE_EDGE_BOTH &&
+                    flow_type != IRQ_TYPE_EDGE_FALLING)
+                        goto err_sense;
+        } else {
+                if (flow_type == IRQ_TYPE_NONE)
+                        flow_type = IRQ_TYPE_LEVEL_LOW;
+
+                if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
+                        goto err_sense;
         }
 
         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
@@ -181,6 +191,10 @@ static int cpm2_set_irq_type(unsigned int virq, unsigned int flow_type)
         if (vold != vnew)
                 out_be32(&cpm2_intctl->ic_siexr, vnew);
         return 0;
+
+err_sense:
+        pr_err("CPM2 PIC: sense type 0x%x not supported\n", flow_type);
+        return -EINVAL;
 }
 
 static struct irq_chip cpm2_pic = {