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| author | Kyle Moffett <Kyle.D.Moffett@boeing.com> | 2011-12-22 10:19:12 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-02-23 10:49:59 +1100 |
| commit | 5019609fce965dbdc66a7d947385fe92ca522231 (patch) | |
| tree | 00678069c54aa7dbdf7ce32b927844957ead65f5 /arch/powerpc/sysdev/mpic.c | |
| parent | 9ca163c8602681ad098910f48f89b97f0cb87c4f (diff) | |
| download | linux-5019609fce965dbdc66a7d947385fe92ca522231.tar.gz linux-5019609fce965dbdc66a7d947385fe92ca522231.tar.bz2 linux-5019609fce965dbdc66a7d947385fe92ca522231.zip | |
powerpc/mpic: Remove MPIC_BROKEN_FRR_NIRQS and duplicate irq_count
The mpic->irq_count variable is only used as a software error-checking
limit to determine whether or not an IRQ number is valid. In board code
which does not manually specify an IRQ count to mpic_alloc(), i.e. 0, it
is automatically detected from the number of ISUs and the ISU size.
In practice, all hardware ends up with irq_count == num_sources, so all
of the runtime checks on mpic->irq_count should just check the value of
mpic->num_sources instead.
When platform hardware does not correctly report the number of IRQs,
which only happens on the MPC85xx/MPC86xx, the MPIC_BROKEN_FRR_NIRQS
flag is used to override the detected value of num_sources with the
manual irq_count parameter. Since there's no need to manually specify
the number of IRQs except in this case, the extra flag can be eliminated
and the test changed to "irq_count != 0".
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/mpic.c')
| -rw-r--r-- | arch/powerpc/sysdev/mpic.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c index c297a524f761..cbffeb742d66 100644 --- a/arch/powerpc/sysdev/mpic.c +++ b/arch/powerpc/sysdev/mpic.c @@ -873,7 +873,7 @@ int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type) DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n", mpic, d->irq, src, flow_type); - if (src >= mpic->irq_count) + if (src >= mpic->num_sources) return -EINVAL; if (flow_type == IRQ_TYPE_NONE) @@ -909,7 +909,7 @@ void mpic_set_vector(unsigned int virq, unsigned int vector) DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n", mpic, virq, src, vector); - if (src >= mpic->irq_count) + if (src >= mpic->num_sources) return; vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); @@ -926,7 +926,7 @@ void mpic_set_destination(unsigned int virq, unsigned int cpuid) DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n", mpic, virq, src, cpuid); - if (src >= mpic->irq_count) + if (src >= mpic->num_sources) return; mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); @@ -1006,7 +1006,7 @@ static int mpic_host_map(struct irq_host *h, unsigned int virq, return 0; } - if (hw >= mpic->irq_count) + if (hw >= mpic->num_sources) return -EINVAL; mpic_msi_reserve_hwirq(mpic, hw); @@ -1221,7 +1221,6 @@ struct mpic * __init mpic_alloc(struct device_node *node, mpic->hc_tm.name = name; mpic->isu_size = isu_size; - mpic->irq_count = irq_count; mpic->num_sources = 0; /* so far */ if (mpic->flags & MPIC_LARGE_VECTORS) @@ -1314,8 +1313,8 @@ struct mpic * __init mpic_alloc(struct device_node *node, */ greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0)); if (isu_size == 0) { - if (mpic->flags & MPIC_BROKEN_FRR_NIRQS) - mpic->num_sources = mpic->irq_count; + if (irq_count) + mpic->num_sources = irq_count; else mpic->num_sources = ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK) @@ -1450,10 +1449,6 @@ void __init mpic_init(struct mpic *mpic) (mpic->ipi_vecs[0] + i)); } - /* Initialize interrupt sources */ - if (mpic->irq_count == 0) - mpic->irq_count = mpic->num_sources; - /* Do the HT PIC fixups on U3 broken mpic */ DBG("MPIC flags: %x\n", mpic->flags); if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) { |