1 files changed, 292 insertions, 190 deletions

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 7e469358895f..7d31d7cc392d 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -100,8 +100,8 @@ static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
 
         if (mpic->flags & MPIC_PRIMARY)
                 cpu = hard_smp_processor_id();
-
-        return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg);
+        return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,
+                          mpic->cpuregs[cpu], reg);
 }
 
 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
@@ -340,27 +340,19 @@ static void __init mpic_scan_ht_pics(struct mpic *mpic)
 #endif /* CONFIG_MPIC_BROKEN_U3 */
 
 
+#define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
+
 /* Find an mpic associated with a given linux interrupt */
 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
 {
-        struct mpic *mpic = mpics;
-
-        while(mpic) {
-                /* search IPIs first since they may override the main interrupts */
-                if (irq >= mpic->ipi_offset && irq < (mpic->ipi_offset + 4)) {
-                        if (is_ipi)
-                                *is_ipi = 1;
-                        return mpic;
-                }
-                if (irq >= mpic->irq_offset &&
-                    irq < (mpic->irq_offset + mpic->irq_count)) {
-                        if (is_ipi)
-                                *is_ipi = 0;
-                        return mpic;
-                }
-                mpic = mpic -> next;
-        }
-        return NULL;
+        unsigned int src = mpic_irq_to_hw(irq);
+
+        if (irq < NUM_ISA_INTERRUPTS)
+                return NULL;
+        if (is_ipi)
+                *is_ipi = (src >= MPIC_VEC_IPI_0 && src <= MPIC_VEC_IPI_3);
+
+        return irq_desc[irq].chip_data;
 }
 
 /* Convert a cpu mask from logical to physical cpu numbers. */
@@ -378,14 +370,14 @@ static inline u32 mpic_physmask(u32 cpumask)
 /* Get the mpic structure from the IPI number */
 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
 {
-        return container_of(irq_desc[ipi].chip, struct mpic, hc_ipi);
+        return irq_desc[ipi].chip_data;
 }
 #endif
 
 /* Get the mpic structure from the irq number */
 static inline struct mpic * mpic_from_irq(unsigned int irq)
 {
-        return container_of(irq_desc[irq].chip, struct mpic, hc_irq);
+        return irq_desc[irq].chip_data;
 }
 
 /* Send an EOI */
@@ -398,9 +390,7 @@ static inline void mpic_eoi(struct mpic *mpic)
 #ifdef CONFIG_SMP
 static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
 {
-        struct mpic *mpic = dev_id;
-
-        smp_message_recv(irq - mpic->ipi_offset, regs);
+        smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0, regs);
         return IRQ_HANDLED;
 }
 #endif /* CONFIG_SMP */
@@ -410,11 +400,11 @@ static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
  */
 
 
-static void mpic_enable_irq(unsigned int irq)
+static void mpic_unmask_irq(unsigned int irq)
 {
         unsigned int loops = 100000;
         struct mpic *mpic = mpic_from_irq(irq);
-        unsigned int src = irq - mpic->irq_offset;
+        unsigned int src = mpic_irq_to_hw(irq);
 
         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
 
@@ -429,39 +419,13 @@ static void mpic_enable_irq(unsigned int irq)
                         break;
                 }
         } while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);    
-
-#ifdef CONFIG_MPIC_BROKEN_U3
-        if (mpic->flags & MPIC_BROKEN_U3) {
-                unsigned int src = irq - mpic->irq_offset;
-                if (mpic_is_ht_interrupt(mpic, src) &&
-                    (irq_desc[irq].status & IRQ_LEVEL))
-                        mpic_ht_end_irq(mpic, src);
-        }
-#endif /* CONFIG_MPIC_BROKEN_U3 */
-}
-
-static unsigned int mpic_startup_irq(unsigned int irq)
-{
-#ifdef CONFIG_MPIC_BROKEN_U3
-        struct mpic *mpic = mpic_from_irq(irq);
-        unsigned int src = irq - mpic->irq_offset;
-#endif /* CONFIG_MPIC_BROKEN_U3 */
-
-        mpic_enable_irq(irq);
-
-#ifdef CONFIG_MPIC_BROKEN_U3
-        if (mpic_is_ht_interrupt(mpic, src))
-                mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
-#endif /* CONFIG_MPIC_BROKEN_U3 */
-
-        return 0;
 }
 
-static void mpic_disable_irq(unsigned int irq)
+static void mpic_mask_irq(unsigned int irq)
 {
         unsigned int loops = 100000;
         struct mpic *mpic = mpic_from_irq(irq);
-        unsigned int src = irq - mpic->irq_offset;
+        unsigned int src = mpic_irq_to_hw(irq);
 
         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
 
@@ -478,23 +442,58 @@ static void mpic_disable_irq(unsigned int irq)
         } while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
 }
 
-static void mpic_shutdown_irq(unsigned int irq)
+static void mpic_end_irq(unsigned int irq)
 {
+        struct mpic *mpic = mpic_from_irq(irq);
+
+#ifdef DEBUG_IRQ
+        DBG("%s: end_irq: %d\n", mpic->name, irq);
+#endif
+        /* We always EOI on end_irq() even for edge interrupts since that
+         * should only lower the priority, the MPIC should have properly
+         * latched another edge interrupt coming in anyway
+         */
+
+        mpic_eoi(mpic);
+}
+
 #ifdef CONFIG_MPIC_BROKEN_U3
+
+static void mpic_unmask_ht_irq(unsigned int irq)
+{
         struct mpic *mpic = mpic_from_irq(irq);
-        unsigned int src = irq - mpic->irq_offset;
+        unsigned int src = mpic_irq_to_hw(irq);
 
-        if (mpic_is_ht_interrupt(mpic, src))
-                mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
+        mpic_unmask_irq(irq);
 
-#endif /* CONFIG_MPIC_BROKEN_U3 */
+        if (irq_desc[irq].status & IRQ_LEVEL)
+                mpic_ht_end_irq(mpic, src);
+}
+
+static unsigned int mpic_startup_ht_irq(unsigned int irq)
+{
+        struct mpic *mpic = mpic_from_irq(irq);
+        unsigned int src = mpic_irq_to_hw(irq);
+
+        mpic_unmask_irq(irq);
+        mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
 
-        mpic_disable_irq(irq);
+        return 0;
 }
 
-static void mpic_end_irq(unsigned int irq)
+static void mpic_shutdown_ht_irq(unsigned int irq)
 {
         struct mpic *mpic = mpic_from_irq(irq);
+        unsigned int src = mpic_irq_to_hw(irq);
+
+        mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
+        mpic_mask_irq(irq);
+}
+
+static void mpic_end_ht_irq(unsigned int irq)
+{
+        struct mpic *mpic = mpic_from_irq(irq);
+        unsigned int src = mpic_irq_to_hw(irq);
 
 #ifdef DEBUG_IRQ
         DBG("%s: end_irq: %d\n", mpic->name, irq);
@@ -504,30 +503,25 @@ static void mpic_end_irq(unsigned int irq)
          * latched another edge interrupt coming in anyway
          */
 
-#ifdef CONFIG_MPIC_BROKEN_U3
-        if (mpic->flags & MPIC_BROKEN_U3) {
-                unsigned int src = irq - mpic->irq_offset;
-                if (mpic_is_ht_interrupt(mpic, src) &&
-                    (irq_desc[irq].status & IRQ_LEVEL))
-                        mpic_ht_end_irq(mpic, src);
-        }
-#endif /* CONFIG_MPIC_BROKEN_U3 */
-
+        if (irq_desc[irq].status & IRQ_LEVEL)
+                mpic_ht_end_irq(mpic, src);
         mpic_eoi(mpic);
 }
 
+#endif /* CONFIG_MPIC_BROKEN_U3 */
+
 #ifdef CONFIG_SMP
 
-static void mpic_enable_ipi(unsigned int irq)
+static void mpic_unmask_ipi(unsigned int irq)
 {
         struct mpic *mpic = mpic_from_ipi(irq);
-        unsigned int src = irq - mpic->ipi_offset;
+        unsigned int src = mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0;
 
         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 }
 
-static void mpic_disable_ipi(unsigned int irq)
+static void mpic_mask_ipi(unsigned int irq)
 {
         /* NEVER disable an IPI... that's just plain wrong! */
 }
@@ -551,29 +545,176 @@ static void mpic_end_ipi(unsigned int irq)
 static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
 {
         struct mpic *mpic = mpic_from_irq(irq);
+        unsigned int src = mpic_irq_to_hw(irq);
 
         cpumask_t tmp;
 
         cpus_and(tmp, cpumask, cpu_online_map);
 
-        mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_DESTINATION,
+        mpic_irq_write(src, MPIC_IRQ_DESTINATION,
                        mpic_physmask(cpus_addr(tmp)[0]));       
 }
 
+static unsigned int mpic_flags_to_vecpri(unsigned int flags, int *level)
+{
+        unsigned int vecpri;
+
+        /* Now convert sense value */
+        switch(flags & IRQ_TYPE_SENSE_MASK) {
+        case IRQ_TYPE_EDGE_RISING:
+                vecpri = MPIC_VECPRI_SENSE_EDGE |
+                        MPIC_VECPRI_POLARITY_POSITIVE;
+                *level = 0;
+                break;
+        case IRQ_TYPE_EDGE_FALLING:
+                vecpri = MPIC_VECPRI_SENSE_EDGE |
+                        MPIC_VECPRI_POLARITY_NEGATIVE;
+                *level = 0;
+                break;
+        case IRQ_TYPE_LEVEL_HIGH:
+                vecpri = MPIC_VECPRI_SENSE_LEVEL |
+                        MPIC_VECPRI_POLARITY_POSITIVE;
+                *level = 1;
+                break;
+        case IRQ_TYPE_LEVEL_LOW:
+        default:
+                vecpri = MPIC_VECPRI_SENSE_LEVEL |
+                        MPIC_VECPRI_POLARITY_NEGATIVE;
+                *level = 1;
+        }
+        return vecpri;
+}
+
+static struct irq_chip mpic_irq_chip = {
+        .mask   = mpic_mask_irq,
+        .unmask = mpic_unmask_irq,
+        .eoi    = mpic_end_irq,
+};
+
+#ifdef CONFIG_SMP
+static struct irq_chip mpic_ipi_chip = {
+        .mask   = mpic_mask_ipi,
+        .unmask = mpic_unmask_ipi,
+        .eoi    = mpic_end_ipi,
+};
+#endif /* CONFIG_SMP */
+
+#ifdef CONFIG_MPIC_BROKEN_U3
+static struct irq_chip mpic_irq_ht_chip = {
+        .startup        = mpic_startup_ht_irq,
+        .shutdown       = mpic_shutdown_ht_irq,
+        .mask           = mpic_mask_irq,
+        .unmask         = mpic_unmask_ht_irq,
+        .eoi            = mpic_end_ht_irq,
+};
+#endif /* CONFIG_MPIC_BROKEN_U3 */
+
+
+static int mpic_host_match(struct irq_host *h, struct device_node *node)
+{
+        struct mpic *mpic = h->host_data;
+
+        /* Exact match, unless mpic node is NULL */
+        return mpic->of_node == NULL || mpic->of_node == node;
+}
+
+static int mpic_host_map(struct irq_host *h, unsigned int virq,
+                         irq_hw_number_t hw, unsigned int flags)
+{
+        struct irq_desc *desc = get_irq_desc(virq);
+        struct irq_chip *chip;
+        struct mpic *mpic = h->host_data;
+        unsigned int vecpri = MPIC_VECPRI_SENSE_LEVEL |
+                MPIC_VECPRI_POLARITY_NEGATIVE;
+        int level;
+
+        pr_debug("mpic: map virq %d, hwirq 0x%lx, flags: 0x%x\n",
+                 virq, hw, flags);
+
+        if (hw == MPIC_VEC_SPURRIOUS)
+                return -EINVAL;
+#ifdef CONFIG_SMP
+        else if (hw >= MPIC_VEC_IPI_0) {
+                WARN_ON(!(mpic->flags & MPIC_PRIMARY));
+
+                pr_debug("mpic: mapping as IPI\n");
+                set_irq_chip_data(virq, mpic);
+                set_irq_chip_and_handler(virq, &mpic->hc_ipi,
+                                         handle_percpu_irq);
+                return 0;
+        }
+#endif /* CONFIG_SMP */
+
+        if (hw >= mpic->irq_count)
+                return -EINVAL;
+
+        /* If no sense provided, check default sense array */
+        if (((flags & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE) &&
+            mpic->senses && hw < mpic->senses_count)
+                flags |= mpic->senses[hw];
+
+        vecpri = mpic_flags_to_vecpri(flags, &level);
+        if (level)
+                desc->status |= IRQ_LEVEL;
+        chip = &mpic->hc_irq;
+
+#ifdef CONFIG_MPIC_BROKEN_U3
+        /* Check for HT interrupts, override vecpri */
+        if (mpic_is_ht_interrupt(mpic, hw)) {
+                vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
+                            MPIC_VECPRI_POLARITY_MASK);
+                vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
+                chip = &mpic->hc_ht_irq;
+        }
+#endif
+
+        /* Reconfigure irq */
+        vecpri |= MPIC_VECPRI_MASK | hw | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
+        mpic_irq_write(hw, MPIC_IRQ_VECTOR_PRI, vecpri);
+
+        pr_debug("mpic: mapping as IRQ\n");
+
+        set_irq_chip_data(virq, mpic);
+        set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
+        return 0;
+}
+
+static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
+                           u32 *intspec, unsigned int intsize,
+                           irq_hw_number_t *out_hwirq, unsigned int *out_flags)
+
+{
+        static unsigned char map_mpic_senses[4] = {
+                IRQ_TYPE_EDGE_RISING,
+                IRQ_TYPE_LEVEL_LOW,
+                IRQ_TYPE_LEVEL_HIGH,
+                IRQ_TYPE_EDGE_FALLING,
+        };
+
+        *out_hwirq = intspec[0];
+        if (intsize > 1 && intspec[1] < 4)
+                *out_flags = map_mpic_senses[intspec[1]];
+        else
+                *out_flags = IRQ_TYPE_NONE;
+
+        return 0;
+}
+
+static struct irq_host_ops mpic_host_ops = {
+        .match = mpic_host_match,
+        .map = mpic_host_map,
+        .xlate = mpic_host_xlate,
+};
 
 /*
  * Exported functions
  */
 
-
-struct mpic * __init mpic_alloc(unsigned long phys_addr,
+struct mpic * __init mpic_alloc(struct device_node *node,
+                                unsigned long phys_addr,
                                 unsigned int flags,
                                 unsigned int isu_size,
-                                unsigned int irq_offset,
                                 unsigned int irq_count,
-                                unsigned int ipi_offset,
-                                unsigned char *senses,
-                                unsigned int senses_count,
                                 const char *name)
 {
         struct mpic     *mpic;
@@ -585,33 +726,38 @@ struct mpic * __init mpic_alloc(unsigned long phys_addr,
         if (mpic == NULL)
                 return NULL;
         
-
         memset(mpic, 0, sizeof(struct mpic));
         mpic->name = name;
+        mpic->of_node = node ? of_node_get(node) : NULL;
 
+        mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256,
+                                       &mpic_host_ops,
+                                       MPIC_VEC_SPURRIOUS);
+        if (mpic->irqhost == NULL) {
+                of_node_put(node);
+                return NULL;
+        }
+
+        mpic->irqhost->host_data = mpic;
+        mpic->hc_irq = mpic_irq_chip;
         mpic->hc_irq.typename = name;
-        mpic->hc_irq.startup = mpic_startup_irq;
-        mpic->hc_irq.shutdown = mpic_shutdown_irq;
-        mpic->hc_irq.enable = mpic_enable_irq;
-        mpic->hc_irq.disable = mpic_disable_irq;
-        mpic->hc_irq.end = mpic_end_irq;
         if (flags & MPIC_PRIMARY)
                 mpic->hc_irq.set_affinity = mpic_set_affinity;
+#ifdef CONFIG_MPIC_BROKEN_U3
+        mpic->hc_ht_irq = mpic_irq_ht_chip;
+        mpic->hc_ht_irq.typename = name;
+        if (flags & MPIC_PRIMARY)
+                mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
+#endif /* CONFIG_MPIC_BROKEN_U3 */
 #ifdef CONFIG_SMP
+        mpic->hc_ipi = mpic_ipi_chip;
         mpic->hc_ipi.typename = name;
-        mpic->hc_ipi.enable = mpic_enable_ipi;
-        mpic->hc_ipi.disable = mpic_disable_ipi;
-        mpic->hc_ipi.end = mpic_end_ipi;
 #endif /* CONFIG_SMP */
 
         mpic->flags = flags;
         mpic->isu_size = isu_size;
-        mpic->irq_offset = irq_offset;
         mpic->irq_count = irq_count;
-        mpic->ipi_offset = ipi_offset;
         mpic->num_sources = 0; /* so far */
-        mpic->senses = senses;
-        mpic->senses_count = senses_count;
 
         /* Map the global registers */
         mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
@@ -679,8 +825,10 @@ struct mpic * __init mpic_alloc(unsigned long phys_addr,
         mpic->next = mpics;
         mpics = mpic;
 
-        if (flags & MPIC_PRIMARY)
+        if (flags & MPIC_PRIMARY) {
                 mpic_primary = mpic;
+                irq_set_default_host(mpic->irqhost);
+        }
 
         return mpic;
 }
@@ -697,26 +845,10 @@ void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
                 mpic->num_sources = isu_first + mpic->isu_size;
 }
 
-void __init mpic_setup_cascade(unsigned int irq, mpic_cascade_t handler,
-                               void *data)
+void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
 {
-        struct mpic *mpic = mpic_find(irq, NULL);
-        unsigned long flags;
-
-        /* Synchronization here is a bit dodgy, so don't try to replace cascade
-         * interrupts on the fly too often ... but normally it's set up at boot.
-         */
-        spin_lock_irqsave(&mpic_lock, flags);
-        if (mpic->cascade)             
-                mpic_disable_irq(mpic->cascade_vec + mpic->irq_offset);
-        mpic->cascade = NULL;
-        wmb();
-        mpic->cascade_vec = irq - mpic->irq_offset;
-        mpic->cascade_data = data;
-        wmb();
-        mpic->cascade = handler;
-        mpic_enable_irq(irq);
-        spin_unlock_irqrestore(&mpic_lock, flags);
+        mpic->senses = senses;
+        mpic->senses_count = count;
 }
 
 void __init mpic_init(struct mpic *mpic)
@@ -724,6 +856,11 @@ void __init mpic_init(struct mpic *mpic)
         int i;
 
         BUG_ON(mpic->num_sources == 0);
+        WARN_ON(mpic->num_sources > MPIC_VEC_IPI_0);
+
+        /* Sanitize source count */
+        if (mpic->num_sources > MPIC_VEC_IPI_0)
+                mpic->num_sources = MPIC_VEC_IPI_0;
 
         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
 
@@ -747,12 +884,6 @@ void __init mpic_init(struct mpic *mpic)
                                MPIC_VECPRI_MASK |
                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
                                (MPIC_VEC_IPI_0 + i));
-#ifdef CONFIG_SMP
-                if (!(mpic->flags & MPIC_PRIMARY))
-                        continue;
-                irq_desc[mpic->ipi_offset+i].status |= IRQ_PER_CPU;
-                irq_desc[mpic->ipi_offset+i].chip = &mpic->hc_ipi;
-#endif /* CONFIG_SMP */
         }
 
         /* Initialize interrupt sources */
@@ -763,31 +894,21 @@ void __init mpic_init(struct mpic *mpic)
         /* Do the HT PIC fixups on U3 broken mpic */
         DBG("MPIC flags: %x\n", mpic->flags);
         if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
-                mpic_scan_ht_pics(mpic);
+                mpic_scan_ht_pics(mpic);
 #endif /* CONFIG_MPIC_BROKEN_U3 */
 
         for (i = 0; i < mpic->num_sources; i++) {
                 /* start with vector = source number, and masked */
                 u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
-                int level = 0;
+                int level = 1;
                 
-                /* if it's an IPI, we skip it */
-                if ((mpic->irq_offset + i) >= (mpic->ipi_offset + i) &&
-                    (mpic->irq_offset + i) <  (mpic->ipi_offset + i + 4))
-                        continue;
-
                 /* do senses munging */
-                if (mpic->senses && i < mpic->senses_count) {
-                        if (mpic->senses[i] & IRQ_SENSE_LEVEL)
-                                vecpri |= MPIC_VECPRI_SENSE_LEVEL;
-                        if (mpic->senses[i] & IRQ_POLARITY_POSITIVE)
-                                vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
-                } else
+                if (mpic->senses && i < mpic->senses_count)
+                        vecpri = mpic_flags_to_vecpri(mpic->senses[i],
+                                                      &level);
+                else
                         vecpri |= MPIC_VECPRI_SENSE_LEVEL;
 
-                /* remember if it was a level interrupts */
-                level = (vecpri & MPIC_VECPRI_SENSE_LEVEL);
-
                 /* deal with broken U3 */
                 if (mpic->flags & MPIC_BROKEN_U3) {
 #ifdef CONFIG_MPIC_BROKEN_U3
@@ -808,12 +929,6 @@ void __init mpic_init(struct mpic *mpic)
                 mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri);
                 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
                                1 << hard_smp_processor_id());
-
-                /* init linux descriptors */
-                if (i < mpic->irq_count) {
-                        irq_desc[mpic->irq_offset+i].status = level ? IRQ_LEVEL : 0;
-                        irq_desc[mpic->irq_offset+i].chip = &mpic->hc_irq;
-                }
         }
         
         /* Init spurrious vector */
@@ -854,19 +969,20 @@ void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
 {
         int is_ipi;
         struct mpic *mpic = mpic_find(irq, &is_ipi);
+        unsigned int src = mpic_irq_to_hw(irq);
         unsigned long flags;
         u32 reg;
 
         spin_lock_irqsave(&mpic_lock, flags);
         if (is_ipi) {
-                reg = mpic_ipi_read(irq - mpic->ipi_offset) &
+                reg = mpic_ipi_read(src - MPIC_VEC_IPI_0) &
                         ~MPIC_VECPRI_PRIORITY_MASK;
-                mpic_ipi_write(irq - mpic->ipi_offset,
+                mpic_ipi_write(src - MPIC_VEC_IPI_0,
                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
         } else {
-                reg = mpic_irq_read(irq - mpic->irq_offset,MPIC_IRQ_VECTOR_PRI)
+                reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI)
                         & ~MPIC_VECPRI_PRIORITY_MASK;
-                mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI,
+                mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
         }
         spin_unlock_irqrestore(&mpic_lock, flags);
@@ -876,14 +992,15 @@ unsigned int mpic_irq_get_priority(unsigned int irq)
 {
         int is_ipi;
         struct mpic *mpic = mpic_find(irq, &is_ipi);
+        unsigned int src = mpic_irq_to_hw(irq);
         unsigned long flags;
         u32 reg;
 
         spin_lock_irqsave(&mpic_lock, flags);
         if (is_ipi)
-                reg = mpic_ipi_read(irq - mpic->ipi_offset);
+                reg = mpic_ipi_read(src = MPIC_VEC_IPI_0);
         else
-                reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI);
+                reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI);
         spin_unlock_irqrestore(&mpic_lock, flags);
         return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
 }
@@ -978,37 +1095,20 @@ void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
 }
 
-int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
+unsigned int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
 {
-        u32 irq;
+        u32 src;
 
-        irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
+        src = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
 #ifdef DEBUG_LOW
-        DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
+        DBG("%s: get_one_irq(): %d\n", mpic->name, src);
 #endif
-        if (mpic->cascade && irq == mpic->cascade_vec) {
-#ifdef DEBUG_LOW
-                DBG("%s: cascading ...\n", mpic->name);
-#endif
-                irq = mpic->cascade(regs, mpic->cascade_data);
-                mpic_eoi(mpic);
-                return irq;
-        }
-        if (unlikely(irq == MPIC_VEC_SPURRIOUS))
-                return -1;
-        if (irq < MPIC_VEC_IPI_0) {
-#ifdef DEBUG_IRQ
-                DBG("%s: irq %d\n", mpic->name, irq + mpic->irq_offset);
-#endif
-                return irq + mpic->irq_offset;
-        }
-#ifdef DEBUG_IPI
-        DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
-#endif
-        return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset;
+        if (unlikely(src == MPIC_VEC_SPURRIOUS))
+                return NO_IRQ;
+        return irq_linear_revmap(mpic->irqhost, src);
 }
 
-int mpic_get_irq(struct pt_regs *regs)
+unsigned int mpic_get_irq(struct pt_regs *regs)
 {
         struct mpic *mpic = mpic_primary;
 
@@ -1022,25 +1122,27 @@ int mpic_get_irq(struct pt_regs *regs)
 void mpic_request_ipis(void)
 {
         struct mpic *mpic = mpic_primary;
-
+        int i;
+        static char *ipi_names[] = {
+                "IPI0 (call function)",
+                "IPI1 (reschedule)",
+                "IPI2 (unused)",
+                "IPI3 (debugger break)",
+        };
         BUG_ON(mpic == NULL);
-        
-        printk("requesting IPIs ... \n");
 
-        /*
-         * IPIs are marked IRQF_DISABLED as they must run with irqs
-         * disabled
-         */
-        request_irq(mpic->ipi_offset+0, mpic_ipi_action, IRQF_DISABLED,
-                    "IPI0 (call function)", mpic);
-        request_irq(mpic->ipi_offset+1, mpic_ipi_action, IRQF_DISABLED,
-                   "IPI1 (reschedule)", mpic);
-        request_irq(mpic->ipi_offset+2, mpic_ipi_action, IRQF_DISABLED,
-                   "IPI2 (unused)", mpic);
-        request_irq(mpic->ipi_offset+3, mpic_ipi_action, IRQF_DISABLED,
-                   "IPI3 (debugger break)", mpic);
-
-        printk("IPIs requested... \n");
+        printk(KERN_INFO "mpic: requesting IPIs ... \n");
+
+        for (i = 0; i < 4; i++) {
+                unsigned int vipi = irq_create_mapping(mpic->irqhost,
+                                                       MPIC_VEC_IPI_0 + i, 0);
+                if (vipi == NO_IRQ) {
+                        printk(KERN_ERR "Failed to map IPI %d\n", i);
+                        break;
+                }
+                request_irq(vipi, mpic_ipi_action, IRQF_DISABLED,
+                            ipi_names[i], mpic);
+        }
 }
 
 void smp_mpic_message_pass(int target, int msg)