1 files changed, 192 insertions, 230 deletions

diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index c9b09a9e6050..3d328bc1f7e0 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -65,39 +65,36 @@ static u32 level_mask[4];
 
 static DEFINE_SPINLOCK(pmac_pic_lock);
 
-#define GATWICK_IRQ_POOL_SIZE        10
-static struct interrupt_info gatwick_int_pool[GATWICK_IRQ_POOL_SIZE];
-
 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
 static unsigned long ppc_lost_interrupts[NR_MASK_WORDS];
+static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
+static int pmac_irq_cascade = -1;
+static struct irq_host *pmac_pic_host;
 
-/*
- * Mark an irq as "lost".  This is only used on the pmac
- * since it can lose interrupts (see pmac_set_irq_mask).
- * -- Cort
- */
-void __set_lost(unsigned long irq_nr, int nokick)
+static void __pmac_retrigger(unsigned int irq_nr)
 {
-        if (!test_and_set_bit(irq_nr, ppc_lost_interrupts)) {
+        if (irq_nr >= max_real_irqs && pmac_irq_cascade > 0) {
+                __set_bit(irq_nr, ppc_lost_interrupts);
+                irq_nr = pmac_irq_cascade;
+                mb();
+        }
+        if (!__test_and_set_bit(irq_nr, ppc_lost_interrupts)) {
                 atomic_inc(&ppc_n_lost_interrupts);
-                if (!nokick)
-                        set_dec(1);
+                set_dec(1);
         }
 }
 
-static void pmac_mask_and_ack_irq(unsigned int irq_nr)
+static void pmac_mask_and_ack_irq(unsigned int virq)
 {
-        unsigned long bit = 1UL << (irq_nr & 0x1f);
-        int i = irq_nr >> 5;
+        unsigned int src = irq_map[virq].hwirq;
+        unsigned long bit = 1UL << (virq & 0x1f);
+        int i = virq >> 5;
         unsigned long flags;
 
-        if ((unsigned)irq_nr >= max_irqs)
-                return;
-
-        clear_bit(irq_nr, ppc_cached_irq_mask);
-        if (test_and_clear_bit(irq_nr, ppc_lost_interrupts))
-                atomic_dec(&ppc_n_lost_interrupts);
         spin_lock_irqsave(&pmac_pic_lock, flags);
+        __clear_bit(src, ppc_cached_irq_mask);
+        if (__test_and_clear_bit(src, ppc_lost_interrupts))
+                atomic_dec(&ppc_n_lost_interrupts);
         out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
         out_le32(&pmac_irq_hw[i]->ack, bit);
         do {
@@ -109,16 +106,29 @@ static void pmac_mask_and_ack_irq(unsigned int irq_nr)
         spin_unlock_irqrestore(&pmac_pic_lock, flags);
 }
 
-static void pmac_set_irq_mask(unsigned int irq_nr, int nokicklost)
+static void pmac_ack_irq(unsigned int virq)
+{
+        unsigned int src = irq_map[virq].hwirq;
+        unsigned long bit = 1UL << (src & 0x1f);
+        int i = src >> 5;
+        unsigned long flags;
+
+        spin_lock_irqsave(&pmac_pic_lock, flags);
+        if (__test_and_clear_bit(src, ppc_lost_interrupts))
+                atomic_dec(&ppc_n_lost_interrupts);
+        out_le32(&pmac_irq_hw[i]->ack, bit);
+        (void)in_le32(&pmac_irq_hw[i]->ack);
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
+}
+
+static void __pmac_set_irq_mask(unsigned int irq_nr, int nokicklost)
 {
         unsigned long bit = 1UL << (irq_nr & 0x1f);
         int i = irq_nr >> 5;
-        unsigned long flags;
 
         if ((unsigned)irq_nr >= max_irqs)
                 return;
 
-        spin_lock_irqsave(&pmac_pic_lock, flags);
         /* enable unmasked interrupts */
         out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
 
@@ -135,71 +145,78 @@ static void pmac_set_irq_mask(unsigned int irq_nr, int nokicklost)
          * the bit in the flag register or request another interrupt.
          */
         if (bit & ppc_cached_irq_mask[i] & in_le32(&pmac_irq_hw[i]->level))
-                __set_lost((ulong)irq_nr, nokicklost);
-        spin_unlock_irqrestore(&pmac_pic_lock, flags);
+                __pmac_retrigger(irq_nr);
 }
 
 /* When an irq gets requested for the first client, if it's an
  * edge interrupt, we clear any previous one on the controller
  */
-static unsigned int pmac_startup_irq(unsigned int irq_nr)
+static unsigned int pmac_startup_irq(unsigned int virq)
 {
-        unsigned long bit = 1UL << (irq_nr & 0x1f);
-        int i = irq_nr >> 5;
+        unsigned long flags;
+        unsigned int src = irq_map[virq].hwirq;
+        unsigned long bit = 1UL << (src & 0x1f);
+        int i = src >> 5;
 
-        if ((irq_desc[irq_nr].status & IRQ_LEVEL) == 0)
+        spin_lock_irqsave(&pmac_pic_lock, flags);
+        if ((irq_desc[virq].status & IRQ_LEVEL) == 0)
                 out_le32(&pmac_irq_hw[i]->ack, bit);
-        set_bit(irq_nr, ppc_cached_irq_mask);
-        pmac_set_irq_mask(irq_nr, 0);
+        __set_bit(src, ppc_cached_irq_mask);
+        __pmac_set_irq_mask(src, 0);
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
 
         return 0;
 }
 
-static void pmac_mask_irq(unsigned int irq_nr)
+static void pmac_mask_irq(unsigned int virq)
 {
-        clear_bit(irq_nr, ppc_cached_irq_mask);
-        pmac_set_irq_mask(irq_nr, 0);
-        mb();
+        unsigned long flags;
+        unsigned int src = irq_map[virq].hwirq;
+
+        spin_lock_irqsave(&pmac_pic_lock, flags);
+        __clear_bit(src, ppc_cached_irq_mask);
+        __pmac_set_irq_mask(src, 0);
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
 }
 
-static void pmac_unmask_irq(unsigned int irq_nr)
+static void pmac_unmask_irq(unsigned int virq)
 {
-        set_bit(irq_nr, ppc_cached_irq_mask);
-        pmac_set_irq_mask(irq_nr, 0);
+        unsigned long flags;
+        unsigned int src = irq_map[virq].hwirq;
+
+        spin_lock_irqsave(&pmac_pic_lock, flags);
+        __set_bit(src, ppc_cached_irq_mask);
+        __pmac_set_irq_mask(src, 0);
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
 }
 
-static void pmac_end_irq(unsigned int irq_nr)
+static int pmac_retrigger(unsigned int virq)
 {
-        if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
-            && irq_desc[irq_nr].action) {
-                set_bit(irq_nr, ppc_cached_irq_mask);
-                pmac_set_irq_mask(irq_nr, 1);
-        }
-}
+        unsigned long flags;
 
+        spin_lock_irqsave(&pmac_pic_lock, flags);
+        __pmac_retrigger(irq_map[virq].hwirq);
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
+        return 1;
+}
 
-struct hw_interrupt_type pmac_pic = {
+static struct irq_chip pmac_pic = {
         .typename       = " PMAC-PIC ",
         .startup        = pmac_startup_irq,
-        .enable         = pmac_unmask_irq,
-        .disable        = pmac_mask_irq,
-        .ack            = pmac_mask_and_ack_irq,
-        .end            = pmac_end_irq,
-};
-
-struct hw_interrupt_type gatwick_pic = {
-        .typename       = " GATWICK  ",
-        .startup        = pmac_startup_irq,
-        .enable         = pmac_unmask_irq,
-        .disable        = pmac_mask_irq,
-        .ack            = pmac_mask_and_ack_irq,
-        .end            = pmac_end_irq,
+        .mask           = pmac_mask_irq,
+        .ack            = pmac_ack_irq,
+        .mask_ack       = pmac_mask_and_ack_irq,
+        .unmask         = pmac_unmask_irq,
+        .retrigger      = pmac_retrigger,
 };
 
 static irqreturn_t gatwick_action(int cpl, void *dev_id, struct pt_regs *regs)
 {
+        unsigned long flags;
         int irq, bits;
+        int rc = IRQ_NONE;
 
+        spin_lock_irqsave(&pmac_pic_lock, flags);
         for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) {
                 int i = irq >> 5;
                 bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
@@ -209,17 +226,20 @@ static irqreturn_t gatwick_action(int cpl, void *dev_id, struct pt_regs *regs)
                 if (bits == 0)
                         continue;
                 irq += __ilog2(bits);
+                spin_unlock_irqrestore(&pmac_pic_lock, flags);
                 __do_IRQ(irq, regs);
-                return IRQ_HANDLED;
+                spin_lock_irqsave(&pmac_pic_lock, flags);
+                rc = IRQ_HANDLED;
         }
-        printk("gatwick irq not from gatwick pic\n");
-        return IRQ_NONE;
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
+        return rc;
 }
 
-static int pmac_get_irq(struct pt_regs *regs)
+static unsigned int pmac_pic_get_irq(struct pt_regs *regs)
 {
         int irq;
         unsigned long bits = 0;
+        unsigned long flags;
 
 #ifdef CONFIG_SMP
         void psurge_smp_message_recv(struct pt_regs *);
@@ -227,9 +247,10 @@ static int pmac_get_irq(struct pt_regs *regs)
         /* IPI's are a hack on the powersurge -- Cort */
         if ( smp_processor_id() != 0 ) {
                 psurge_smp_message_recv(regs);
-                return -2;      /* ignore, already handled */
+                return NO_IRQ_IGNORE;   /* ignore, already handled */
         }
 #endif /* CONFIG_SMP */
+        spin_lock_irqsave(&pmac_pic_lock, flags);
         for (irq = max_real_irqs; (irq -= 32) >= 0; ) {
                 int i = irq >> 5;
                 bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
@@ -241,133 +262,10 @@ static int pmac_get_irq(struct pt_regs *regs)
                 irq += __ilog2(bits);
                 break;
         }
-
-        return irq;
-}
-
-/* This routine will fix some missing interrupt values in the device tree
- * on the gatwick mac-io controller used by some PowerBooks
- *
- * Walking of OF nodes could use a bit more fixing up here, but it's not
- * very important as this is all boot time code on static portions of the
- * device-tree.
- *
- * However, the modifications done to "intrs" will have to be removed and
- * replaced with proper updates of the "interrupts" properties or
- * AAPL,interrupts, yet to be decided, once the dynamic parsing is there.
- */
-static void __init pmac_fix_gatwick_interrupts(struct device_node *gw,
-                                               int irq_base)
-{
-        struct device_node *node;
-        int count;
-
-        memset(gatwick_int_pool, 0, sizeof(gatwick_int_pool));
-        count = 0;
-        for (node = NULL; (node = of_get_next_child(gw, node)) != NULL;) {
-                /* Fix SCC */
-                if ((strcasecmp(node->name, "escc") == 0) && node->child) {
-                        if (node->child->n_intrs < 3) {
-                                node->child->intrs = &gatwick_int_pool[count];
-                                count += 3;
-                        }
-                        node->child->n_intrs = 3;
-                        node->child->intrs[0].line = 15+irq_base;
-                        node->child->intrs[1].line =  4+irq_base;
-                        node->child->intrs[2].line =  5+irq_base;
-                        printk(KERN_INFO "irq: fixed SCC on gatwick"
-                               " (%d,%d,%d)\n",
-                               node->child->intrs[0].line,
-                               node->child->intrs[1].line,
-                               node->child->intrs[2].line);
-                }
-                /* Fix media-bay & left SWIM */
-                if (strcasecmp(node->name, "media-bay") == 0) {
-                        struct device_node* ya_node;
-
-                        if (node->n_intrs == 0)
-                                node->intrs = &gatwick_int_pool[count++];
-                        node->n_intrs = 1;
-                        node->intrs[0].line = 29+irq_base;
-                        printk(KERN_INFO "irq: fixed media-bay on gatwick"
-                               " (%d)\n", node->intrs[0].line);
-
-                        ya_node = node->child;
-                        while(ya_node) {
-                                if (strcasecmp(ya_node->name, "floppy") == 0) {
-                                        if (ya_node->n_intrs < 2) {
-                                                ya_node->intrs = &gatwick_int_pool[count];
-                                                count += 2;
-                                        }
-                                        ya_node->n_intrs = 2;
-                                        ya_node->intrs[0].line = 19+irq_base;
-                                        ya_node->intrs[1].line =  1+irq_base;
-                                        printk(KERN_INFO "irq: fixed floppy on second controller (%d,%d)\n",
-                                                ya_node->intrs[0].line, ya_node->intrs[1].line);
-                                }
-                                if (strcasecmp(ya_node->name, "ata4") == 0) {
-                                        if (ya_node->n_intrs < 2) {
-                                                ya_node->intrs = &gatwick_int_pool[count];
-                                                count += 2;
-                                        }
-                                        ya_node->n_intrs = 2;
-                                        ya_node->intrs[0].line = 14+irq_base;
-                                        ya_node->intrs[1].line =  3+irq_base;
-                                        printk(KERN_INFO "irq: fixed ide on second controller (%d,%d)\n",
-                                                ya_node->intrs[0].line, ya_node->intrs[1].line);
-                                }
-                                ya_node = ya_node->sibling;
-                        }
-                }
-        }
-        if (count > 10) {
-                printk("WARNING !! Gatwick interrupt pool overflow\n");
-                printk("  GATWICK_IRQ_POOL_SIZE = %d\n", GATWICK_IRQ_POOL_SIZE);
-                printk("              requested = %d\n", count);
-        }
-}
-
-/*
- * The PowerBook 3400/2400/3500 can have a combo ethernet/modem
- * card which includes an ohare chip that acts as a second interrupt
- * controller.  If we find this second ohare, set it up and fix the
- * interrupt value in the device tree for the ethernet chip.
- */
-static void __init enable_second_ohare(struct device_node *np)
-{
-        unsigned char bus, devfn;
-        unsigned short cmd;
-        struct device_node *ether;
-
-        /* This code doesn't strictly belong here, it could be part of
-         * either the PCI initialisation or the feature code. It's kept
-         * here for historical reasons.
-         */
-        if (pci_device_from_OF_node(np, &bus, &devfn) == 0) {
-                struct pci_controller* hose =
-                        pci_find_hose_for_OF_device(np);
-                if (!hose) {
-                        printk(KERN_ERR "Can't find PCI hose for OHare2 !\n");
-                        return;
-                }
-                early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd);
-                cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
-                cmd &= ~PCI_COMMAND_IO;
-                early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd);
-        }
-
-        /* Fix interrupt for the modem/ethernet combo controller. The number
-         * in the device tree (27) is bogus (correct for the ethernet-only
-         * board but not the combo ethernet/modem board).
-         * The real interrupt is 28 on the second controller -> 28+32 = 60.
-         */
-        ether = of_find_node_by_name(NULL, "pci1011,14");
-        if (ether && ether->n_intrs > 0) {
-                ether->intrs[0].line = 60;
-                printk(KERN_INFO "irq: Fixed ethernet IRQ to %d\n",
-                       ether->intrs[0].line);
-        }
-        of_node_put(ether);
+        spin_unlock_irqrestore(&pmac_pic_lock, flags);
+        if (unlikely(irq < 0))
+                return NO_IRQ;
+        return irq_linear_revmap(pmac_pic_host, irq);
 }
 
 #ifdef CONFIG_XMON
@@ -386,17 +284,60 @@ static struct irqaction gatwick_cascade_action = {
         .name           = "cascade",
 };
 
+static int pmac_pic_host_match(struct irq_host *h, struct device_node *node)
+{
+        /* We match all, we don't always have a node anyway */
+        return 1;
+}
+
+static int pmac_pic_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);
+        int level;
+
+        if (hw >= max_irqs)
+                return -EINVAL;
+
+        /* Mark level interrupts, set delayed disable for edge ones and set
+         * handlers
+         */
+        level = !!(level_mask[hw >> 5] & (1UL << (hw & 0x1f)));
+        if (level)
+                desc->status |= IRQ_LEVEL;
+        else
+                desc->status |= IRQ_DELAYED_DISABLE;
+        set_irq_chip_and_handler(virq, &pmac_pic, level ?
+                                 handle_level_irq : handle_edge_irq);
+        return 0;
+}
+
+static int pmac_pic_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)
+
+{
+        *out_hwirq = *intspec;
+        return 0;
+}
+
+static struct irq_host_ops pmac_pic_host_ops = {
+        .match = pmac_pic_host_match,
+        .map = pmac_pic_host_map,
+        .xlate = pmac_pic_host_xlate,
+};
+
 static void __init pmac_pic_probe_oldstyle(void)
 {
         int i;
-        int irq_cascade = -1;
         struct device_node *master = NULL;
         struct device_node *slave = NULL;
         u8 __iomem *addr;
         struct resource r;
 
         /* Set our get_irq function */
-        ppc_md.get_irq = pmac_get_irq;
+        ppc_md.get_irq = pmac_pic_get_irq;
 
         /*
          * Find the interrupt controller type & node
@@ -414,7 +355,6 @@ static void __init pmac_pic_probe_oldstyle(void)
                 if (slave) {
                         max_irqs = 64;
                         level_mask[1] = OHARE_LEVEL_MASK;
-                        enable_second_ohare(slave);
                 }
         } else if ((master = of_find_node_by_name(NULL, "mac-io")) != NULL) {
                 max_irqs = max_real_irqs = 64;
@@ -438,14 +378,18 @@ static void __init pmac_pic_probe_oldstyle(void)
                         max_irqs = 128;
                         level_mask[2] = HEATHROW_LEVEL_MASK;
                         level_mask[3] = 0;
-                        pmac_fix_gatwick_interrupts(slave, max_real_irqs);
                 }
         }
         BUG_ON(master == NULL);
 
-        /* Set the handler for the main PIC */
-        for ( i = 0; i < max_real_irqs ; i++ )
-                irq_desc[i].chip = &pmac_pic;
+        /*
+         * Allocate an irq host
+         */
+        pmac_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, max_irqs,
+                                       &pmac_pic_host_ops,
+                                       max_irqs);
+        BUG_ON(pmac_pic_host == NULL);
+        irq_set_default_host(pmac_pic_host);
 
         /* Get addresses of first controller if we have a node for it */
         BUG_ON(of_address_to_resource(master, 0, &r));
@@ -472,39 +416,38 @@ static void __init pmac_pic_probe_oldstyle(void)
                         pmac_irq_hw[i++] =
                                 (volatile struct pmac_irq_hw __iomem *)
                                 (addr + 0x10);
-                irq_cascade = slave->intrs[0].line;
+                pmac_irq_cascade = irq_of_parse_and_map(slave, 0);
 
                 printk(KERN_INFO "irq: Found slave Apple PIC %s for %d irqs"
                        " cascade: %d\n", slave->full_name,
-                       max_irqs - max_real_irqs, irq_cascade);
+                       max_irqs - max_real_irqs, pmac_irq_cascade);
         }
         of_node_put(slave);
 
-        /* disable all interrupts in all controllers */
+        /* Disable all interrupts in all controllers */
         for (i = 0; i * 32 < max_irqs; ++i)
                 out_le32(&pmac_irq_hw[i]->enable, 0);
 
-        /* mark level interrupts */
-        for (i = 0; i < max_irqs; i++)
-                if (level_mask[i >> 5] & (1UL << (i & 0x1f)))
-                        irq_desc[i].status = IRQ_LEVEL;
+        /* Hookup cascade irq */
+        if (slave && pmac_irq_cascade != NO_IRQ)
+                setup_irq(pmac_irq_cascade, &gatwick_cascade_action);
 
-        /* Setup handlers for secondary controller and hook cascade irq*/
-        if (slave) {
-                for ( i = max_real_irqs ; i < max_irqs ; i++ )
-                        irq_desc[i].chip = &gatwick_pic;
-                setup_irq(irq_cascade, &gatwick_cascade_action);
-        }
         printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs);
 #ifdef CONFIG_XMON
-        setup_irq(20, &xmon_action);
+        setup_irq(irq_create_mapping(NULL, 20, 0), &xmon_action);
 #endif
 }
 #endif /* CONFIG_PPC32 */
 
-static int pmac_u3_cascade(struct pt_regs *regs, void *data)
+static void pmac_u3_cascade(unsigned int irq, struct irq_desc *desc,
+                            struct pt_regs *regs)
 {
-        return mpic_get_one_irq((struct mpic *)data, regs);
+        struct mpic *mpic = desc->handler_data;
+
+        unsigned int cascade_irq = mpic_get_one_irq(mpic, regs);
+        if (cascade_irq != NO_IRQ)
+                generic_handle_irq(cascade_irq, regs);
+        desc->chip->eoi(irq);
 }
 
 static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
@@ -514,21 +457,20 @@ static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
         int nmi_irq;
 
         pswitch = of_find_node_by_name(NULL, "programmer-switch");
-        if (pswitch && pswitch->n_intrs) {
-                nmi_irq = pswitch->intrs[0].line;
-                mpic_irq_set_priority(nmi_irq, 9);
-                setup_irq(nmi_irq, &xmon_action);
+        if (pswitch) {
+                nmi_irq = irq_of_parse_and_map(pswitch, 0);
+                if (nmi_irq != NO_IRQ) {
+                        mpic_irq_set_priority(nmi_irq, 9);
+                        setup_irq(nmi_irq, &xmon_action);
+                }
+                of_node_put(pswitch);
         }
-        of_node_put(pswitch);
 #endif  /* defined(CONFIG_XMON) && defined(CONFIG_PPC32) */
 }
 
 static struct mpic * __init pmac_setup_one_mpic(struct device_node *np,
                                                 int master)
 {
-        unsigned char senses[128];
-        int offset = master ? 0 : 128;
-        int count = master ? 128 : 124;
         const char *name = master ? " MPIC 1   " : " MPIC 2   ";
         struct resource r;
         struct mpic *mpic;
@@ -541,8 +483,6 @@ static struct mpic * __init pmac_setup_one_mpic(struct device_node *np,
 
         pmac_call_feature(PMAC_FTR_ENABLE_MPIC, np, 0, 0);
 
-        prom_get_irq_senses(senses, offset, offset + count);
-
         flags |= MPIC_WANTS_RESET;
         if (get_property(np, "big-endian", NULL))
                 flags |= MPIC_BIG_ENDIAN;
@@ -553,8 +493,7 @@ static struct mpic * __init pmac_setup_one_mpic(struct device_node *np,
         if (master && (flags & MPIC_BIG_ENDIAN))
                 flags |= MPIC_BROKEN_U3;
 
-        mpic = mpic_alloc(r.start, flags, 0, offset, count, master ? 252 : 0,
-                          senses, count, name);
+        mpic = mpic_alloc(np, r.start, flags, 0, 0, name);
         if (mpic == NULL)
                 return NULL;
 
@@ -567,6 +506,7 @@ static int __init pmac_pic_probe_mpic(void)
 {
         struct mpic *mpic1, *mpic2;
         struct device_node *np, *master = NULL, *slave = NULL;
+        unsigned int cascade;
 
         /* We can have up to 2 MPICs cascaded */
         for (np = NULL; (np = of_find_node_by_type(np, "open-pic"))
@@ -603,8 +543,15 @@ static int __init pmac_pic_probe_mpic(void)
         of_node_put(master);
 
         /* No slave, let's go out */
-        if (slave == NULL || slave->n_intrs < 1)
+        if (slave == NULL)
+                return 0;
+
+        /* Get/Map slave interrupt */
+        cascade = irq_of_parse_and_map(slave, 0);
+        if (cascade == NO_IRQ) {
+                printk(KERN_ERR "Failed to map cascade IRQ\n");
                 return 0;
+        }
 
         mpic2 = pmac_setup_one_mpic(slave, 0);
         if (mpic2 == NULL) {
@@ -612,7 +559,8 @@ static int __init pmac_pic_probe_mpic(void)
                 of_node_put(slave);
                 return 0;
         }
-        mpic_setup_cascade(slave->intrs[0].line, pmac_u3_cascade, mpic2);
+        set_irq_data(cascade, mpic2);
+        set_irq_chained_handler(cascade, pmac_u3_cascade);
 
         of_node_put(slave);
         return 0;
@@ -621,6 +569,19 @@ static int __init pmac_pic_probe_mpic(void)
 
 void __init pmac_pic_init(void)
 {
+        unsigned int flags = 0;
+
+        /* We configure the OF parsing based on our oldworld vs. newworld
+         * platform type and wether we were booted by BootX.
+         */
+#ifdef CONFIG_PPC32
+        if (!pmac_newworld)
+                flags |= OF_IMAP_OLDWORLD_MAC;
+        if (get_property(of_chosen, "linux,bootx", NULL) != NULL)
+                flags |= OF_IMAP_NO_PHANDLE;
+        of_irq_map_init(flags);
+#endif /* CONFIG_PPC_32 */
+
         /* We first try to detect Apple's new Core99 chipset, since mac-io
          * is quite different on those machines and contains an IBM MPIC2.
          */
@@ -643,6 +604,7 @@ unsigned long sleep_save_mask[2];
 
 /* This used to be passed by the PMU driver but that link got
  * broken with the new driver model. We use this tweak for now...
+ * We really want to do things differently though...
  */
 static int pmacpic_find_viaint(void)
 {
@@ -656,7 +618,7 @@ static int pmacpic_find_viaint(void)
         np = of_find_node_by_name(NULL, "via-pmu");
         if (np == NULL)
                 goto not_found;
-        viaint = np->intrs[0].line;
+        viaint = irq_of_parse_and_map(np, 0);;
 #endif /* CONFIG_ADB_PMU */
 
 not_found: