diff options
Diffstat (limited to 'arch/powerpc/platforms/powermac/pic.c')
| -rw-r--r-- | arch/powerpc/platforms/powermac/pic.c | 72 |
1 files changed, 66 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c index 630a533d0e5..890d5f72b19 100644 --- a/arch/powerpc/platforms/powermac/pic.c +++ b/arch/powerpc/platforms/powermac/pic.c @@ -46,6 +46,10 @@ struct pmac_irq_hw { unsigned int level; }; +/* Workaround flags for 32bit powermac machines */ +unsigned int of_irq_workarounds; +struct device_node *of_irq_dflt_pic; + /* Default addresses */ static volatile struct pmac_irq_hw __iomem *pmac_irq_hw[4]; @@ -428,6 +432,42 @@ static void __init pmac_pic_probe_oldstyle(void) setup_irq(irq_create_mapping(NULL, 20), &xmon_action); #endif } + +int of_irq_map_oldworld(struct device_node *device, int index, + struct of_irq *out_irq) +{ + const u32 *ints = NULL; + int intlen; + + /* + * Old machines just have a list of interrupt numbers + * and no interrupt-controller nodes. We also have dodgy + * cases where the APPL,interrupts property is completely + * missing behind pci-pci bridges and we have to get it + * from the parent (the bridge itself, as apple just wired + * everything together on these) + */ + while (device) { + ints = of_get_property(device, "AAPL,interrupts", &intlen); + if (ints != NULL) + break; + device = device->parent; + if (device && strcmp(device->type, "pci") != 0) + break; + } + if (ints == NULL) + return -EINVAL; + intlen /= sizeof(u32); + + if (index >= intlen) + return -EINVAL; + + out_irq->controller = NULL; + out_irq->specifier[0] = ints[index]; + out_irq->size = 1; + + return 0; +} #endif /* CONFIG_PPC32 */ static void pmac_u3_cascade(unsigned int irq, struct irq_desc *desc) @@ -559,19 +599,39 @@ 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; + of_irq_workarounds |= OF_IMAP_OLDWORLD_MAC; if (of_get_property(of_chosen, "linux,bootx", NULL) != NULL) - flags |= OF_IMAP_NO_PHANDLE; -#endif /* CONFIG_PPC_32 */ + of_irq_workarounds |= OF_IMAP_NO_PHANDLE; - of_irq_map_init(flags); + /* If we don't have phandles on a newworld, then try to locate a + * default interrupt controller (happens when booting with BootX). + * We do a first match here, hopefully, that only ever happens on + * machines with one controller. + */ + if (pmac_newworld && (of_irq_workarounds & OF_IMAP_NO_PHANDLE)) { + struct device_node *np; + + for_each_node_with_property(np, "interrupt-controller") { + /* Skip /chosen/interrupt-controller */ + if (strcmp(np->name, "chosen") == 0) + continue; + /* It seems like at least one person wants + * to use BootX on a machine with an AppleKiwi + * controller which happens to pretend to be an + * interrupt controller too. */ + if (strcmp(np->name, "AppleKiwi") == 0) + continue; + /* I think we found one ! */ + of_irq_dflt_pic = np; + break; + } + } +#endif /* CONFIG_PPC32 */ /* We first try to detect Apple's new Core99 chipset, since mac-io * is quite different on those machines and contains an IBM MPIC2. |