Exynos4: Enable device tree support for GIC controller

[kgene.kim@samsung.com (Kukjin Kim)]

Thomas Abraham wrote:
> 
> Changes since v1:
> - Dropped device tree support for interrupt combiner controller from this
patchset.
>   Some rework in the interrupt combiner controller code is required to
address
>   the irq domain related comments from Grant Likely and hence those
changes will
>   be in another patchset.
> - As suggested by Grant Likely, linux virq number 0 is left unused.
> 
> This patchset adds device tree support for GIC controller in Exynos4 SoC.
> 
> Patch 1 moves the statically mapped timer irqs 11 to 15 to the end of the
> statically mapped linux irq space for Exynos4 platforms.
> 
> For Exynos4 platforms, the five hardware timer irqs are connected to GIC
> at some hardware irq number (in exynos it is GIC_ID 69 to 73 for five
timers).
> When any of these hardware interrupt occurs, its interrupt handler calls
> generic_handle_irq() with linux irq number 11/12/13/14/15 for timer
0/1/2/3/4
> as the parameter. The code that needs to be notified about the timer
interrupts
> would have already registered its handler for either of the interrupts 11
to 15.
> 
> Instead of using linux irq number 11 to 15 to which consumers of timer
interrupt
> attach their handler, this interrupt range is moved to the end of linux
irq
> space used. So there will be no interrupts statically mapped between 0 to
31.
> 
> The GIC hardware interrupts, which were previously statically mapped to
> start from linux irq 32 are now moved to start from linux irq 0. In case
of
> exynos, GIC_ID[0] (which is SGI[0]) which was previously at linux irq 32,
will
> not be at linux irq 0. This was required to use Rob Herring's GIC OF
bindings
> patches for Exynos4.
> 
> Patch 2 adds a interceptor for all ioremap calls targeted towards any of
the
> statically remapped memory region. This was required because the GIC OF
> binding's patchset ioremaps the GIC memory-mapped regions in the
gic_of_init()
> function. Without this patch, there would be two separate remap for GIC
> controller, one statically remapped and the other dynamically remapped by
the
> gic_of_init() function. The patch will eventually be superseded by Nicolas
> Pitre's vmalloc patch series.
> 
> Patch 3 adds device tree support for GIC controllers on Exynos4. For GIC
> controller, this patch is based on Rob Herring's,
> "[PATCH 0/3] GIC OF bindings" patchset.
> 
> This patchset is based on the following tree:
> git://git.linaro.org/git/people/arnd/arm-soc.git   branch: for-next
> 
> Thomas Abraham (3):
>   ARM: Exynos4: Move timer irq numbers to end of linux irq space
>   ARM: Exynos4: Add ioremap interceptor for statically remapped regions
>   ARM: Exynos4: Enable conversion of GIC dt irq specifier to linux virq
> 
>  arch/arm/mach-exynos4/cpu.c                      |   33
> +++++++++++++++++++++-
>  arch/arm/mach-exynos4/include/mach/entry-macro.S |    1 -
>  arch/arm/mach-exynos4/include/mach/io.h          |    5 +++
>  arch/arm/mach-exynos4/include/mach/irqs.h        |    8 +++--
>  arch/arm/mach-s5p64x0/include/mach/irqs.h        |    2 +
>  arch/arm/mach-s5pc100/include/mach/irqs.h        |    2 +
>  arch/arm/mach-s5pv210/include/mach/irqs.h        |    2 +
>  arch/arm/plat-samsung/include/plat/irqs.h        |    3 +-
>  8 files changed, 50 insertions(+), 6 deletions(-)

Looks ok to me, I replaced previous patches with this series.

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.