On Wed, 2008-05-21 at 15:59 -0500, Kumar Gala wrote:
> 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 <[EMAIL PROTECTED]>
Acked-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
> ---
>
> Screw up with git on the first version.
>
> - k
>
> arch/powerpc/sysdev/mpic.c | 9 ++++++---
> include/asm-powerpc/mpic.h | 2 ++
> 2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
> index 8619f2a..12e285d 100644
> --- a/arch/powerpc/sysdev/mpic.c
> +++ b/arch/powerpc/sysdev/mpic.c
> @@ -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++) {
> diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
> index 943c5a3..6802570 100644
> --- a/include/asm-powerpc/mpic.h
> +++ b/include/asm-powerpc/mpic.h
> @@ -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
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