diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/setup.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index fccca89ee04..bef4f683285 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -124,6 +124,51 @@ void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) desc->chip->eoi(irq); } +static void __init xics_setup_8259_cascade(void) +{ + struct device_node *np, *old, *found = NULL; + int cascade, naddr; + const u32 *addrp; + unsigned long intack = 0; + + for_each_node_by_type(np, "interrupt-controller") + if (of_device_is_compatible(np, "chrp,iic")) { + found = np; + break; + } + if (found == NULL) { + printk(KERN_DEBUG "xics: no ISA interrupt controller\n"); + return; + } + cascade = irq_of_parse_and_map(found, 0); + if (cascade == NO_IRQ) { + printk(KERN_ERR "xics: failed to map cascade interrupt"); + return; + } + pr_debug("xics: cascade mapped to irq %d\n", cascade); + + for (old = of_node_get(found); old != NULL ; old = np) { + np = of_get_parent(old); + of_node_put(old); + if (np == NULL) + break; + if (strcmp(np->name, "pci") != 0) + continue; + addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); + if (addrp == NULL) + continue; + naddr = of_n_addr_cells(np); + intack = addrp[naddr-1]; + if (naddr > 1) + intack |= ((unsigned long)addrp[naddr-2]) << 32; + } + if (intack) + printk(KERN_DEBUG "xics: PCI 8259 intack at 0x%016lx\n", intack); + i8259_init(found, intack); + of_node_put(found); + set_irq_chained_handler(cascade, pseries_8259_cascade); +} + static void __init pseries_mpic_init_IRQ(void) { struct device_node *np, *old, *cascade = NULL; @@ -203,6 +248,12 @@ static void __init pseries_mpic_init_IRQ(void) set_irq_chained_handler(cascade_irq, pseries_8259_cascade); } +static void __init pseries_xics_init_IRQ(void) +{ + xics_init_IRQ(); + xics_setup_8259_cascade(); +} + static void pseries_lpar_enable_pmcs(void) { unsigned long set, reset; @@ -232,7 +283,7 @@ static void __init pseries_discover_pic(void) smp_init_pseries_mpic(); return; } else if (strstr(typep, "ppc-xicp")) { - ppc_md.init_IRQ = xics_init_IRQ; + ppc_md.init_IRQ = pseries_xics_init_IRQ; setup_kexec_cpu_down_xics(); smp_init_pseries_xics(); return; |