kernel.git/arch/xtensa/kernel/irq.c, branch linux-4.1.y

xtensa: don't use linux IRQ #0

2017-06-26T02:02:21Z

[ Upstream commit e5c86679d5e864947a52fb31e45a425dea3e7fa9 ] Linux IRQ #0 is reserved for error reporting and may not be used. Increase NR_IRQS for one additional slot and increase irq_domain_add_legacy parameter first_irq value to 1, so that linux IRQ #0 is not associated with hardware IRQ #0 in legacy IRQ domains. Introduce macro XTENSA_PIC_LINUX_IRQ for static translation of xtensa PIC hardware IRQ # to linux IRQ #. Use this macro in XTFPGA platform data definitions. This fixes inability to use hardware IRQ #0 in configurations that don't use device tree and allows for non-identity mapping between linux IRQ # and hardware IRQ #. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov Signed-off-by: Sasha Levin

xtensa: Use irq_set_affinity instead of homebrewn code

2014-03-04T16:37:55Z

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

2014-01-14T18:19:59Z

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

xtensa: add SMP support

2014-01-14T18:19:58Z

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

2014-01-14T18:19:58Z

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

2014-01-14T18:19:57Z

- 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

2014-01-14T18:19:56Z

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

2012-12-19T05:10:23Z

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

2012-12-19T05:10:23Z

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

2012-10-16T04:48:08Z

- 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