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[POWERPC] mpic: Deal with bogus NIRQ in Feature Reporting Register 

Some chips (like the SoCs from Freescale) report the wrong value in NIRQ
and this causes issues if its doesn't match or exceed the value of
irq_count.

Add a flag that board code can set to just use irq_count instead of
FRR[NIRQ].  Eventually we'll add a device tree property with the number
of sources.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala 2008-05-22 06:59:23 +10:00 committed by Paul Mackerras
parent 2ca7633dc7
commit 475ca391b4
2 changed files with 8 additions and 3 deletions
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9
arch/powerpc/sysdev/mpic.c
View File

@ -1144,9 +1144,12 @@ struct mpic * __init mpic_alloc(struct device_node *node,
mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
>> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
if (isu_size == 0)
mpic->num_sources =
((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
if (flags & MPIC_BROKEN_FRR_NIRQS)
mpic->num_sources = mpic->irq_count;
else
mpic->num_sources =
((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
/* Map the per-CPU registers */
for (i = 0; i < mpic->num_cpus; i++) {

2
include/asm-powerpc/mpic.h
View File

@ -353,6 +353,8 @@ struct mpic
#define MPIC_ENABLE_MCK 0x00000200
/* Disable bias among target selection, spread interrupts evenly */
#define MPIC_NO_BIAS 0x00000400
/* Ignore NIRQS as reported by FRR */
#define MPIC_BROKEN_FRR_NIRQS 0x00000800
/* MPIC HW modification ID */
#define MPIC_REGSET_MASK 0xf0000000