On Wed, Nov 25, 2015 at 12:06:57PM +0000, Qais Yousef wrote:
> The new property will allow to specify the range of GIC hwirqs to use for IPIs.
>
> This is an optinal property. We preserve the previous behaviour of allocating
> the last 2 * gic_vpes if it's not specified or DT is not supported.
>
> Signed-off-by: Qais Yousef <qais.yousef@xxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Pawel Moll <pawel.moll@xxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
> Cc: Kumar Gala <galak@xxxxxxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
Acked-by: Rob Herring <robh@xxxxxxxxxx>
>
> ---
> .../devicetree/bindings/interrupt-controller/mips-gic.txt | 7 +++++++
> drivers/irqchip/irq-mips-gic.c | 12 ++++++++++--
> 2 files changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt b/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
> index aae4c384ee1f..173595305e26 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
> +++ b/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
> @@ -23,6 +23,12 @@ Optional properties:
> - mti,reserved-cpu-vectors : Specifies the list of CPU interrupt vectors
> to which the GIC may not route interrupts. Valid values are 2 - 7.
> This property is ignored if the CPU is started in EIC mode.
> +- mti,reserved-ipi-vectors : Specifies the range of GIC interrupts that are
> + reserved for IPIs.
> + It accepts 2 values, the 1st is the starting interrupt and the 2nd is the size
> + of the reserved range.
> + If not specified, the driver will allocate the last 2 * number of VPEs in the
> + system.
>
> Required properties for timer sub-node:
> - compatible : Should be "mti,gic-timer".
> @@ -44,6 +50,7 @@ Example:
> #interrupt-cells = <3>;
>
> mti,reserved-cpu-vectors = <7>;
> + mti,reserved-ipi-vectors = <40 8>;
>
> timer {
> compatible = "mti,gic-timer";
> diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
> index c7043a15253b..659fe734d1b7 100644
> --- a/drivers/irqchip/irq-mips-gic.c
> +++ b/drivers/irqchip/irq-mips-gic.c
> @@ -945,6 +945,7 @@ static void __init __gic_init(unsigned long gic_base_addr,
> struct device_node *node)
> {
> unsigned int gicconfig;
> + unsigned int v[2];
>
> gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
>
> @@ -1013,8 +1014,15 @@ static void __init __gic_init(unsigned long gic_base_addr,
>
> gic_ipi_domain->bus_token = DOMAIN_BUS_IPI;
>
> - /* Make the last 2 * NR_CPUS available for IPIs */
> - bitmap_set(ipi_resrv, gic_shared_intrs - 2 * gic_vpes, 2 * gic_vpes);
> + if (node &&
> + !of_property_read_u32_array(node, "mti,reserved-ipi-vectors", &v, 2)) {
> + bitmap_set(ipi_resrv, v[0], v[1]);
> + } else {
> + /* Make the last 2 * gic_vpes available for IPIs */
> + bitmap_set(ipi_resrv,
> + gic_shared_intrs - 2 * gic_vpes,
> + 2 * gic_vpes);
> + }
>
> gic_basic_init();
> }
> --
> 2.1.0
>
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