linux.git/arch/xtensa/kernel/irq.c, branch v3.18.74

xtensa: Use irq_set_affinity instead of homebrewn code

2014-03-04T16:37:55+00:00

There is no point in having an incomplete copy of irq_set_affinity()
for the hotplug irq migration code.

Use the core function instead and while at it switch to
for_each_active_irq()

Signed-off-by: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Chris Zankel 
Cc: xtensa 
Link: http://lkml.kernel.org/r/20140223212736.664624945@linutronix.de
Signed-off-by: Thomas Gleixner

xtensa: implement CPU hotplug

2014-01-14T18:19:59+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add SMP support

2014-01-14T18:19:58+00:00

This is largely based on SMP code from the xtensa-2.6.29-smp tree by
Piet Delaney, Marc Gauthier, Joe Taylor, Christian Zankel (and possibly
other Tensilica folks).

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add MX irqchip

2014-01-14T18:19:58+00:00

MX is an interrupt distributor used in some SMP-capable xtensa
configurations.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: clean up do_interrupt/do_IRQ

2014-01-14T18:19:57+00:00

- set up irq registers and call irq_enter/irq_exit once for each kernel
  entry due to interrupt;
- don't attempt to clear current IRQ in the do_interrupt, IRQ handler
  will take care of it;
- find pending interrupt with highest priority before every ISR
  invocation.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: move built-in PIC to drivers/irqchip

2014-01-14T18:19:56+00:00

Extract xtensa built-in interrupt controller implementation from
xtensa/kernel/irq.c and move it to other irqchips, providing way to
instantiate it from the device tree.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add device trees support

2012-12-19T05:10:23+00:00

Device trees allow specification of hardware topology and device
parameters at runtime instead of hard-coding them in platform setup
code. This allows running single binary kernel on a range of compatible
boards.

New boot parameters tag BP_TAG_FDT is allocated and a pointer to flat
device tree is passed in it.

Note that current interrupt mapping scheme uses single cell for
interrupt identification. That means that IRQ numbers used in DTS must
be CPU internal IRQ numbers, not external. It is possible to extend
interrupt identification to two cells, and use second cell to tell
external IRQ numbers form internal. That would allow to use single DTS
on multiple boards with different mapping of external IRQ numbers.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add IRQ domains support

2012-12-19T05:10:23+00:00

IRQ domains provide a mechanism for conversion of linux IRQ numbers to
hardware IRQ numbers and vice versus. It is used by OpenFirmware for
linking device tree objects to their respective interrupt controllers.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: reorganize SR referencing

2012-10-16T04:48:08+00:00

- reference SRs by names where possible, not by numbers;
- get rid of __stringify around SR names where possible;
- remove unneeded SR names from asm/regs.h;
- add SREG_ prefix to remaining SR names;

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: fix xtensa_irq_unmask calls

2012-10-03T22:11:19+00:00

xtensa_irq_disable/xtensa_irq_enable used to call xtensa_irq_unmask with
wrong argument.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel