MIPS: Cavium: Add CPU hotplugging code.
[linux-2.6.git] / arch / mips / cavium-octeon / octeon-irq.c
index 3090ee3..384f184 100644 (file)
@@ -501,3 +501,62 @@ asmlinkage void plat_irq_dispatch(void)
                }
        }
 }
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int is_irq_enabled_on_cpu(unsigned int irq, unsigned int cpu)
+{
+       unsigned int isset;
+#ifdef CONFIG_SMP
+       int coreid = cpu_logical_map(cpu);
+#else
+       int coreid = cvmx_get_core_num();
+#endif
+       int bit = (irq < OCTEON_IRQ_WDOG0) ?
+               irq - OCTEON_IRQ_WORKQ0 : irq - OCTEON_IRQ_WDOG0;
+       if (irq < 64) {
+               isset = (cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)) &
+                       (1ull << bit)) >> bit;
+       } else {
+              isset = (cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)) &
+                       (1ull << bit)) >> bit;
+       }
+       return isset;
+}
+
+void fixup_irqs(void)
+{
+       int irq;
+
+       for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++)
+               octeon_irq_core_disable_local(irq);
+
+       for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_GPIO15; irq++) {
+               if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
+                       /* ciu irq migrates to next cpu */
+                       octeon_irq_chip_ciu0.disable(irq);
+                       octeon_irq_ciu0_set_affinity(irq, &cpu_online_map);
+               }
+       }
+
+#if 0
+       for (irq = OCTEON_IRQ_MBOX0; irq <= OCTEON_IRQ_MBOX1; irq++)
+               octeon_irq_mailbox_mask(irq);
+#endif
+       for (irq = OCTEON_IRQ_UART0; irq <= OCTEON_IRQ_BOOTDMA; irq++) {
+               if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
+                       /* ciu irq migrates to next cpu */
+                       octeon_irq_chip_ciu0.disable(irq);
+                       octeon_irq_ciu0_set_affinity(irq, &cpu_online_map);
+               }
+       }
+
+       for (irq = OCTEON_IRQ_UART2; irq <= OCTEON_IRQ_RESERVED135; irq++) {
+               if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
+                       /* ciu irq migrates to next cpu */
+                       octeon_irq_chip_ciu1.disable(irq);
+                       octeon_irq_ciu1_set_affinity(irq, &cpu_online_map);
+               }
+       }
+}
+
+#endif /* CONFIG_HOTPLUG_CPU */