Blackfin: SMP: add support for IRQ affinity

Now that the Blackfin IRQ controller supports this, drivers get the normal
functionality of controlling which CPU to bind IRQs to.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 34 insertions, 4 deletions

diff --git a/arch/blackfin/mach-common/ints-priority.c b/arch/blackfin/mach-common/ints-priority.c
index 5202a6076695..a5d243409d23 100644
--- a/arch/blackfin/mach-common/ints-priority.c
+++ b/arch/blackfin/mach-common/ints-priority.c
@@ -173,7 +173,12 @@ static void bfin_internal_mask_irq(unsigned int irq)
         local_irq_restore_hw(flags);
 }
 
+#ifdef CONFIG_SMP
+static void bfin_internal_unmask_irq_affinity(unsigned int irq,
+                const struct cpumask *affinity)
+#else
 static void bfin_internal_unmask_irq(unsigned int irq)
+#endif
 {
         unsigned long flags;
 
@@ -186,16 +191,38 @@ static void bfin_internal_unmask_irq(unsigned int irq)
         local_irq_save_hw(flags);
         mask_bank = SIC_SYSIRQ(irq) / 32;
         mask_bit = SIC_SYSIRQ(irq) % 32;
-        bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) |
-                             (1 << mask_bit));
 #ifdef CONFIG_SMP
-        bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) |
-                             (1 << mask_bit));
+        if (cpumask_test_cpu(0, affinity))
+#endif
+                bfin_write_SIC_IMASK(mask_bank,
+                        bfin_read_SIC_IMASK(mask_bank) |
+                        (1 << mask_bit));
+#ifdef CONFIG_SMP
+        if (cpumask_test_cpu(1, affinity))
+                bfin_write_SICB_IMASK(mask_bank,
+                        bfin_read_SICB_IMASK(mask_bank) |
+                        (1 << mask_bit));
 #endif
 #endif
         local_irq_restore_hw(flags);
 }
 
+#ifdef CONFIG_SMP
+static void bfin_internal_unmask_irq(unsigned int irq)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        bfin_internal_unmask_irq_affinity(irq, desc->affinity);
+}
+
+static int bfin_internal_set_affinity(unsigned int irq, const struct cpumask *mask)
+{
+        bfin_internal_mask_irq(irq);
+        bfin_internal_unmask_irq_affinity(irq, mask);
+
+        return 0;
+}
+#endif
+
 #ifdef CONFIG_PM
 int bfin_internal_set_wake(unsigned int irq, unsigned int state)
 {
@@ -271,6 +298,9 @@ static struct irq_chip bfin_internal_irqchip = {
         .mask_ack = bfin_internal_mask_irq,
         .disable = bfin_internal_mask_irq,
         .enable = bfin_internal_unmask_irq,
+#ifdef CONFIG_SMP
+        .set_affinity = bfin_internal_set_affinity,
+#endif
 #ifdef CONFIG_PM
         .set_wake = bfin_internal_set_wake,
 #endif