diff options
author | Kyle Moffett <Kyle.D.Moffett@boeing.com> | 2011-12-02 06:28:07 (GMT) |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-12-07 02:43:09 (GMT) |
commit | 09dc34a95bfbc6062e1e7de0b96175480924aea8 (patch) | |
tree | d21a67d125278304324415ae2b7c23aa056584dc /arch/powerpc/sysdev | |
parent | c51242e7080d2265761de309cdea222d7e27bdfe (diff) | |
download | linux-fsl-qoriq-09dc34a95bfbc6062e1e7de0b96175480924aea8.tar.xz |
powerpc/mpic: Add in-core support for cascaded MPICs
The Cell and PowerMac platforms use virtually identical cascaded-IRQ
setup code, so just merge it into the core. Ideally this code would
trigger automatically when an MPIC device-node specifies an "interrupts"
property, perhaps even enabling MPIC_SECONDARY along the way.
Unfortunately, Benjamin Herrenschmidt has had bad experiences in the
past with the quality of Apple PowerMac device-trees, so to be safe we
will only try to parse out an IRQ if the MPIC_SECONDARY flag is set by
the caller.
Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/sysdev')
-rw-r--r-- | arch/powerpc/sysdev/mpic.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c index 7611060..4e9ccb1 100644 --- a/arch/powerpc/sysdev/mpic.c +++ b/arch/powerpc/sysdev/mpic.c @@ -1111,6 +1111,22 @@ static int mpic_host_xlate(struct irq_host *h, struct device_node *ct, return 0; } +/* IRQ handler for a secondary MPIC cascaded from another IRQ controller */ +static void mpic_cascade(unsigned int irq, struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct mpic *mpic = irq_desc_get_handler_data(desc); + unsigned int virq; + + BUG_ON(!(mpic->flags & MPIC_SECONDARY)); + + virq = mpic_get_one_irq(mpic); + if (virq != NO_IRQ) + generic_handle_irq(virq); + + chip->irq_eoi(&desc->irq_data); +} + static struct irq_host_ops mpic_host_ops = { .match = mpic_host_match, .map = mpic_host_map, @@ -1402,8 +1418,7 @@ void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count) void __init mpic_init(struct mpic *mpic) { - int i; - int cpu; + int i, cpu; BUG_ON(mpic->num_sources == 0); @@ -1488,6 +1503,17 @@ void __init mpic_init(struct mpic *mpic) GFP_KERNEL); BUG_ON(mpic->save_data == NULL); #endif + + /* Check if this MPIC is chained from a parent interrupt controller */ + if (mpic->flags & MPIC_SECONDARY) { + int virq = irq_of_parse_and_map(mpic->node, 0); + if (virq != NO_IRQ) { + printk(KERN_INFO "%s: hooking up to IRQ %d\n", + mpic->node->full_name, virq); + irq_set_handler_data(virq, mpic); + irq_set_chained_handler(virq, &mpic_cascade); + } + } } void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio) |