[PATCH] mpic: add support for serial mode interrupts

[Benjamin Herrenschmidt]

On Mon, 2006-06-19 at 13:08 -0700, Mark A. Greer wrote:
> MPC10x-style interrupt controllers have a serial mode that allows
> several interrupts to be clocked in through one INT signal.
> 
> This patch adds the software support for that mode.

You hard code the clock ratio... why not add a separate call to be
called after mpic_init,
something like mpic_set_serial_int(int mpic, int enable, int
clock_ratio) ?

Ben.

> Signed-off-by: Mark A. Greer <mgreer at mvista.com>
> --
> 
>  arch/powerpc/sysdev/mpic.c |    6 ++++++
>  include/asm-powerpc/mpic.h |    2 ++
>  2 files changed, 8 insertions(+)
> --
> 
> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
> index 7dcdfcb..1829aed 100644
> --- a/arch/powerpc/sysdev/mpic.c
> +++ b/arch/powerpc/sysdev/mpic.c
> @@ -629,6 +629,12 @@ #endif /* CONFIG_SMP */
>  			mb();
>  	}
>  
> +	/* For serial interrupts & set clock ratio */
> +	if (flags & MPIC_SERIAL_MODE)
> +		mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1,
> +			mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1)
> +				| (1<<27) | (0x7<<28));
> +
>  	/* Read feature register, calculate num CPUs and, for non-ISU
>  	 * MPICs, num sources as well. On ISU MPICs, sources are counted
>  	 * as ISUs are added
> diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
> index 6b9e781..f35ccdc 100644
> --- a/include/asm-powerpc/mpic.h
> +++ b/include/asm-powerpc/mpic.h
> @@ -186,6 +186,8 @@ #define MPIC_BROKEN_U3			0x00000004
>  #define MPIC_BROKEN_IPI			0x00000008
>  /* MPIC wants a reset */
>  #define MPIC_WANTS_RESET		0x00000010
> +/* MPIC serial mode */
> +#define MPIC_SERIAL_MODE		0x00000020
>  
>  /* Allocate the controller structure and setup the linux irq descs
>   * for the range if interrupts passed in. No HW initialization is
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