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irqchip/mips-gic: Add new DT property to reserve IPIs 

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@imgtec.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: <jason@lakedaemon.net>
Cc: <marc.zyngier@arm.com>
Cc: <jiang.liu@linux.intel.com>
Cc: <linux-mips@linux-mips.org>
Cc: <lisa.parratt@imgtec.com>
Cc: Qais Yousef <qsyousef@gmail.com>
Link: http://lkml.kernel.org/r/1449580830-23652-20-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Qais Yousef 2015-12-08 13:20:30 +00:00 committed by Thomas Gleixner
parent 7eb8c99db2
commit 16a8083ced
2 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
View File

@ -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";

12
drivers/irqchip/irq-mips-gic.c
View File

@ -957,6 +957,7 @@ static void __init __gic_init(unsigned long gic_base_addr,
struct device_node *node)
{
unsigned int gicconfig;
unsigned int v[2];
__gic_base_addr = gic_base_addr;
@ -1027,8 +1028,15 @@ static void __init __gic_init(unsigned long gic_base_addr,
gic_ipi_domain->bus_token = DOMAIN_BUS_IPI;
/* Make the last 2 * gic_vpes 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();
}