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ARCv2: intc: Rework the build time irq count information

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Currently Kconfig knob ARC_NUMBER_OF_INTERRUPTS is used as indicator of
hard irq count. But it is flawed that it doesn't affect
 - NR_IRQS     : for number of virtual interrupts
 - NR_CPU_IRQS : for number of hardware interrupts

Moreover the actual hardware irq count might still not be same as
ARC_NUMBER_OF_INTERRUPTS. So use the information availble in the
Build Configuration Registers and get rid of the Kconfig option.

We still need "some" build time info about irq count to set up
sufficient number of vector table entries. This is done with a
sufficiently large NR_CPU_IRQS which will eventually be used soley for
that purpose (subsequent patches will remove its usage elsewhere)

So to summarize what this patch does:

  * NR_CPU_IRQS defines a maximum number of hardware interrupts.
  * Remove ARC_NUMBER_OF_INTERRUPTS option and create interrupts
    table for all possible hardware interrupts.
  * Increase a maximum number of virtual IRQs to 512. ARCv2 can
    support 240 interrupts in the core interrupts controllers
    and 128 interrupts in IDU. Thus 512 virtual IRQs must be
    enough for most configurations of boards.

This patch leads to NR_CPU_IRQS in 2 places, to reduce the overall
churn. The next patch will remove the 2nd definition anyways.

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: reworked the changelog a bit]
This commit is contained in:
Yuriy Kolerov 2017-01-31 14:45:22 +03:00 committed by Vineet Gupta
parent fe7b109946
commit f33b8cddc8
3 changed files with 13 additions and 13 deletions
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11
arch/arc/Kconfig
View File

@ -412,17 +412,6 @@ config ARC_HAS_DIV_REM
bool "Insn: div, divu, rem, remu"
default y
config ARC_NUMBER_OF_INTERRUPTS
int "Number of interrupts"
range 8 240
default 32
help
This defines the number of interrupts on the ARCv2HS core.
It affects the size of vector table.
The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable
in hardware, it keep things simple for Linux to assume they are always
present.
endif # ISA_ARCV2
endmenu # "ARC CPU Configuration"

8
arch/arc/include/asm/irq.h
View File

@ -9,7 +9,13 @@
#ifndef __ASM_ARC_IRQ_H
#define __ASM_ARC_IRQ_H
#define NR_IRQS 128 /* allow some CPU external IRQ handling */
/*
* ARCv2 can support 240 interrupts in the core interrupts controllers and
* 128 interrupts in IDU. Thus 512 virtual IRQs must be enough for most
* configurations of boards.
* This doesnt affect ARCompact, but we change it to same value
*/
#define NR_IRQS 512
/* Platform Independent IRQs */
#ifdef CONFIG_ISA_ARCV2

7
arch/arc/kernel/entry-arcv2.S
View File

@ -14,6 +14,11 @@
#include <asm/arcregs.h>
#include <asm/irqflags.h>
; A maximum number of supported interrupts in the core interrupt controller.
; This number is not equal to the maximum interrupt number (256) because
; first 16 lines are reserved for exceptions and are not configurable.
#define NR_CPU_IRQS 240
.cpu HS
#define VECTOR .word
@ -52,7 +57,7 @@ VECTOR handle_interrupt ; unused
VECTOR handle_interrupt ; (23) unused
# End of fixed IRQs
.rept CONFIG_ARC_NUMBER_OF_INTERRUPTS - 8
.rept NR_CPU_IRQS - 8
VECTOR handle_interrupt
.endr