[SPARC64]: of_device layer IRQ resolution

Do IRQ determination generically by parsing the PROM properties,
and using IRQ controller drivers for final resolution.

One immediate positive effect is that all of the IRQ frobbing
in the EBUS, ISA, and PCI controller layers has been eliminated.
We just look up the of_device and use the properly computed
value.

The PCI controller irq_build() routines are gone and no longer
used.  Unfortunately sbus_build_irq() has to remain as there is
a direct reference to this in the sunzilog driver.  That can be
killed off once the sparc32 side of this is written and the
sunzilog driver is transformed into an "of" bus driver.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 188 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/of_device.c b/arch/sparc64/kernel/of_device.c
index 9812cfa6dd36..3670dc8a7d5f 100644
--- a/arch/sparc64/kernel/of_device.c
+++ b/arch/sparc64/kernel/of_device.c
@@ -146,6 +146,26 @@ void of_iounmap(void __iomem *base, unsigned long size)
 }
 EXPORT_SYMBOL(of_iounmap);
 
+static int node_match(struct device *dev, void *data)
+{
+        struct of_device *op = to_of_device(dev);
+        struct device_node *dp = data;
+
+        return (op->node == dp);
+}
+
+struct of_device *of_find_device_by_node(struct device_node *dp)
+{
+        struct device *dev = bus_find_device(&of_bus_type, NULL,
+                                             dp, node_match);
+
+        if (dev)
+                return to_of_device(dev);
+
+        return NULL;
+}
+EXPORT_SYMBOL(of_find_device_by_node);
+
 #ifdef CONFIG_PCI
 struct bus_type isa_bus_type = {
        .name    = "isa",
@@ -261,7 +281,6 @@ static unsigned int of_bus_default_get_flags(u32 *addr)
         return IORESOURCE_MEM;
 }
 
-
 /*
  * PCI bus specific translator
  */
@@ -594,12 +613,171 @@ static void __init build_device_resources(struct of_device *op,
         }
 }
 
+static struct device_node * __init
+apply_interrupt_map(struct device_node *dp, struct device_node *pp,
+                    u32 *imap, int imlen, u32 *imask,
+                    unsigned int *irq_p)
+{
+        struct device_node *cp;
+        unsigned int irq = *irq_p;
+        struct of_bus *bus;
+        phandle handle;
+        u32 *reg;
+        int na, num_reg, i;
+
+        bus = of_match_bus(pp);
+        bus->count_cells(dp, &na, NULL);
+
+        reg = of_get_property(dp, "reg", &num_reg);
+        if (!reg || !num_reg)
+                return NULL;
+
+        imlen /= ((na + 3) * 4);
+        handle = 0;
+        for (i = 0; i < imlen; i++) {
+                int j;
+
+                for (j = 0; j < na; j++) {
+                        if ((reg[j] & imask[j]) != imap[j])
+                                goto next;
+                }
+                if (imap[na] == irq) {
+                        handle = imap[na + 1];
+                        irq = imap[na + 2];
+                        break;
+                }
+
+        next:
+                imap += (na + 3);
+        }
+        if (i == imlen)
+                return NULL;
+
+        *irq_p = irq;
+        cp = of_find_node_by_phandle(handle);
+
+        return cp;
+}
+
+static unsigned int __init pci_irq_swizzle(struct device_node *dp,
+                                           struct device_node *pp,
+                                           unsigned int irq)
+{
+        struct linux_prom_pci_registers *regs;
+        unsigned int devfn, slot, ret;
+
+        if (irq < 1 || irq > 4)
+                return irq;
+
+        regs = of_get_property(dp, "reg", NULL);
+        if (!regs)
+                return irq;
+
+        devfn = (regs->phys_hi >> 8) & 0xff;
+        slot = (devfn >> 3) & 0x1f;
+
+        ret = ((irq - 1 + (slot & 3)) & 3) + 1;
+
+        return ret;
+}
+
+static unsigned int __init build_one_device_irq(struct of_device *op,
+                                                struct device *parent,
+                                                unsigned int irq)
+{
+        struct device_node *dp = op->node;
+        struct device_node *pp, *ip;
+        unsigned int orig_irq = irq;
+
+        if (irq == 0xffffffff)
+                return irq;
+
+        if (dp->irq_trans) {
+                irq = dp->irq_trans->irq_build(dp, irq,
+                                               dp->irq_trans->data);
+#if 1
+                printk("%s: direct translate %x --> %x\n",
+                       dp->full_name, orig_irq, irq);
+#endif
+                return irq;
+        }
+
+        /* Something more complicated.  Walk up to the root, applying
+         * interrupt-map or bus specific translations, until we hit
+         * an IRQ translator.
+         *
+         * If we hit a bus type or situation we cannot handle, we
+         * stop and assume that the original IRQ number was in a
+         * format which has special meaning to it's immediate parent.
+         */
+        pp = dp->parent;
+        ip = NULL;
+        while (pp) {
+                void *imap, *imsk;
+                int imlen;
+
+                imap = of_get_property(pp, "interrupt-map", &imlen);
+                imsk = of_get_property(pp, "interrupt-map-mask", NULL);
+                if (imap && imsk) {
+                        struct device_node *iret;
+                        int this_orig_irq = irq;
+
+                        iret = apply_interrupt_map(dp, pp,
+                                                   imap, imlen, imsk,
+                                                   &irq);
+#if 1
+                        printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
+                               op->node->full_name,
+                               pp->full_name, this_orig_irq,
+                               (iret ? iret->full_name : "NULL"), irq);
+#endif
+                        if (!iret)
+                                break;
+
+                        if (iret->irq_trans) {
+                                ip = iret;
+                                break;
+                        }
+                } else {
+                        if (!strcmp(pp->type, "pci") ||
+                            !strcmp(pp->type, "pciex")) {
+                                unsigned int this_orig_irq = irq;
+
+                                irq = pci_irq_swizzle(dp, pp, irq);
+#if 1
+                                printk("%s: PCI swizzle [%s] %x --> %x\n",
+                                       op->node->full_name,
+                                       pp->full_name, this_orig_irq, irq);
+#endif
+                        }
+
+                        if (pp->irq_trans) {
+                                ip = pp;
+                                break;
+                        }
+                }
+                dp = pp;
+                pp = pp->parent;
+        }
+        if (!ip)
+                return orig_irq;
+
+        irq = ip->irq_trans->irq_build(op->node, irq,
+                                       ip->irq_trans->data);
+#if 1
+        printk("%s: Apply IRQ trans [%s] %x --> %x\n",
+               op->node->full_name, ip->full_name, orig_irq, irq);
+#endif
+
+        return irq;
+}
+
 static struct of_device * __init scan_one_device(struct device_node *dp,
                                                  struct device *parent)
 {
         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
         unsigned int *irq;
-        int len;
+        int len, i;
 
         if (!op)
                 return NULL;
@@ -613,12 +791,16 @@ static struct of_device * __init scan_one_device(struct device_node *dp,
                 op->portid = of_getintprop_default(dp, "portid", -1);
 
         irq = of_get_property(dp, "interrupts", &len);
-        if (irq)
-                op->irq = *irq;
-        else
-                op->irq = 0xffffffff;
+        if (irq) {
+                memcpy(op->irqs, irq, len);
+                op->num_irqs = len / 4;
+        } else {
+                op->num_irqs = 0;
+        }
 
         build_device_resources(op, parent);
+        for (i = 0; i < op->num_irqs; i++)
+                op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 
         op->dev.parent = parent;
         op->dev.bus = &of_bus_type;