ARM: orion: switch to a per-platform handle_irq() function

Moving to the Device Tree implies having CONFIG_MULTI_IRQ_HANDLER
enabled, even for non-DT platforms (if we want both DT and non-DT
platforms to be supported in a single kernel).

However, the common CONFIG_MULTI_IRQ_HANDLER handler for non-DT
platforms in plat-orion/irq.c doesn't match the needs of
Orion5x. Also, it doesn't make much sense for orion_irq_init() to
register the multi-IRQ handler: orion_irq_init() is called once for
each IRQ cause/mask tuple, while the multi-IRQ handler only needs to
be registered once.

To solve this problem, we move the multi-IRQ handle in per-platform
code: mach-kirkwood/irq.c and mach-dove/irq.c. The Orion5x variant
will be introduced in a followup commit. Of course, this code will
ultimately be completely removed once all boards are converted to the
Device Tree.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-23-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/mach-dove/irq.c b/arch/arm/mach-dove/irq.c
index bc4344aa1009..4a5a7aedcb76 100644
--- a/arch/arm/mach-dove/irq.c
+++ b/arch/arm/mach-dove/irq.c
@@ -108,6 +108,38 @@ static int __initdata gpio2_irqs[4] = {
         0,
 };
 
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+/*
+ * Compiling with both non-DT and DT support enabled, will
+ * break asm irq handler used by non-DT boards. Therefore,
+ * we provide a C-style irq handler even for non-DT boards,
+ * if MULTI_IRQ_HANDLER is set.
+ */
+
+static void __iomem *dove_irq_base = IRQ_VIRT_BASE;
+
+static asmlinkage void
+__exception_irq_entry dove_legacy_handle_irq(struct pt_regs *regs)
+{
+        u32 stat;
+
+        stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_LOW_OFF);
+        stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF);
+        if (stat) {
+                unsigned int hwirq = __fls(stat);
+                handle_IRQ(hwirq, regs);
+                return;
+        }
+        stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_HIGH_OFF);
+        stat &= readl_relaxed(dove_irq_base + IRQ_MASK_HIGH_OFF);
+        if (stat) {
+                unsigned int hwirq = 32 + __fls(stat);
+                handle_IRQ(hwirq, regs);
+                return;
+        }
+}
+#endif
+
 void __init dove_init_irq(void)
 {
         int i;
@@ -115,6 +147,10 @@ void __init dove_init_irq(void)
         orion_irq_init(0, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
         orion_irq_init(32, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
 
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+        set_handle_irq(dove_legacy_handle_irq);
+#endif
+
         /*
          * Initialize gpiolib for GPIOs 0-71.
          */