1 files changed, 142 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/xics.h b/arch/powerpc/include/asm/xics.h
new file mode 100644
index 000000000000..b183a4062011
--- /dev/null
+++ b/arch/powerpc/include/asm/xics.h
@@ -0,0 +1,142 @@
+/*
+ * Common definitions accross all variants of ICP and ICS interrupt
+ * controllers.
+ */
+
+#ifndef _XICS_H
+#define _XICS_H
+
+#include <linux/interrupt.h>
+
+#define XICS_IPI                2
+#define XICS_IRQ_SPURIOUS       0
+
+/* Want a priority other than 0.  Various HW issues require this. */
+#define DEFAULT_PRIORITY        5
+
+/*
+ * Mark IPIs as higher priority so we can take them inside interrupts that
+ * arent marked IRQF_DISABLED
+ */
+#define IPI_PRIORITY            4
+
+/* The least favored priority */
+#define LOWEST_PRIORITY         0xFF
+
+/* The number of priorities defined above */
+#define MAX_NUM_PRIORITIES      3
+
+/* Native ICP */
+extern int icp_native_init(void);
+
+/* PAPR ICP */
+extern int icp_hv_init(void);
+
+/* ICP ops */
+struct icp_ops {
+        unsigned int (*get_irq)(void);
+        void (*eoi)(struct irq_data *d);
+        void (*set_priority)(unsigned char prio);
+        void (*teardown_cpu)(void);
+        void (*flush_ipi)(void);
+#ifdef CONFIG_SMP
+        void (*cause_ipi)(int cpu, unsigned long data);
+        irq_handler_t ipi_action;
+#endif
+};
+
+extern const struct icp_ops *icp_ops;
+
+/* Native ICS */
+extern int ics_native_init(void);
+
+/* RTAS ICS */
+extern int ics_rtas_init(void);
+
+/* ICS instance, hooked up to chip_data of an irq */
+struct ics {
+        struct list_head link;
+        int (*map)(struct ics *ics, unsigned int virq);
+        void (*mask_unknown)(struct ics *ics, unsigned long vec);
+        long (*get_server)(struct ics *ics, unsigned long vec);
+        int (*host_match)(struct ics *ics, struct device_node *node);
+        char data[];
+};
+
+/* Commons */
+extern unsigned int xics_default_server;
+extern unsigned int xics_default_distrib_server;
+extern unsigned int xics_interrupt_server_size;
+extern struct irq_host *xics_host;
+
+struct xics_cppr {
+        unsigned char stack[MAX_NUM_PRIORITIES];
+        int index;
+};
+
+DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
+
+static inline void xics_push_cppr(unsigned int vec)
+{
+        struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+
+        if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
+                return;
+
+        if (vec == XICS_IPI)
+                os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
+        else
+                os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
+}
+
+static inline unsigned char xics_pop_cppr(void)
+{
+        struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+
+        if (WARN_ON(os_cppr->index < 1))
+                return LOWEST_PRIORITY;
+
+        return os_cppr->stack[--os_cppr->index];
+}
+
+static inline void xics_set_base_cppr(unsigned char cppr)
+{
+        struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+
+        /* we only really want to set the priority when there's
+         * just one cppr value on the stack
+         */
+        WARN_ON(os_cppr->index != 0);
+
+        os_cppr->stack[0] = cppr;
+}
+
+static inline unsigned char xics_cppr_top(void)
+{
+        struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+        
+        return os_cppr->stack[os_cppr->index];
+}
+
+DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
+
+extern void xics_init(void);
+extern void xics_setup_cpu(void);
+extern void xics_update_irq_servers(void);
+extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
+extern void xics_mask_unknown_vec(unsigned int vec);
+extern irqreturn_t xics_ipi_dispatch(int cpu);
+extern int xics_smp_probe(void);
+extern void xics_register_ics(struct ics *ics);
+extern void xics_teardown_cpu(void);
+extern void xics_kexec_teardown_cpu(int secondary);
+extern void xics_migrate_irqs_away(void);
+#ifdef CONFIG_SMP
+extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
+                               unsigned int strict_check);
+#else
+#define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
+#endif
+
+
+#endif /* _XICS_H */