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authorPaul Mundt <lethal@linux-sh.org>2009-11-02 09:43:20 +0300
committerPaul Mundt <lethal@linux-sh.org>2009-11-02 09:43:20 +0300
commit45b9deaf14e74543371aa8faea69c14e27b038c6 (patch)
tree485b9beab7f908557ab816fa473d7a5bdb494841 /drivers/sh
parent3d0de414423a20af741b692243317f423827489b (diff)
downloadlinux-45b9deaf14e74543371aa8faea69c14e27b038c6.tar.xz
sh: intc: Handle legacy IRQ reservation in vector map.
Different CPUs will have different starting vectors, with varying amounts of reserved or unusable vector space prior to the first slot. This introduces a legacy vector reservation system that inserts itself in between the CPU vector map registration and the platform specific IRQ setup. This works fine in practice as the only new vectors that boards need to establish on their own should be dynamically allocated rather than arbitrarily assigned. As a plus, this also makes all of the converted platforms sparseirq ready. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/sh')
-rw-r--r--drivers/sh/intc.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index 4789df43c0f9..a7e5c2e9986c 100644
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -928,3 +928,28 @@ void destroy_irq(unsigned int irq)
__clear_bit(irq, intc_irq_map);
spin_unlock_irqrestore(&vector_lock, flags);
}
+
+int reserve_irq_vector(unsigned int irq)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ if (test_and_set_bit(irq, intc_irq_map))
+ ret = -EBUSY;
+ spin_unlock_irqrestore(&vector_lock, flags);
+
+ return ret;
+}
+
+void reserve_irq_legacy(void)
+{
+ unsigned long flags;
+ int i, j;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ j = find_first_bit(intc_irq_map, nr_irqs);
+ for (i = 0; i < j; i++)
+ __set_bit(i, intc_irq_map);
+ spin_unlock_irqrestore(&vector_lock, flags);
+}