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Commit 3b581f54 authored by Pavel Pisa's avatar Pavel Pisa Committed by Russell King
Browse files

[ARM] 4171/1: i.MX/MX1 optimize interrupt source retrieval 



The macro "get_irqnr_and_base" in "entry-macro.S" optimized
according to Lennert Buytenhek suggestion.

Comments from Pavel Pisa:

 Sascha has approved patch some days ago

Signed-off-by: default avatarPavel Pisa <pisa@cmp.felk.cvut.cz>
Acked-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent cb36bb75

include/asm-arm/arch-imx/entry-macro.S

+6 −12
Original line number Diff line number Diff line
@@ -13,19 +13,13 @@ 
		.endm

#define AITC_NIVECSR   0x40

		.macro	get_irqnr_and_base, irqnr, irqstat, base, tmp

		ldr	\irqstat, =IO_ADDRESS(IMX_AITC_BASE)

		ldr	\base, =IO_ADDRESS(IMX_AITC_BASE)

		@ Load offset & priority of the highest priority

		@ interrupt pending.

		ldr	\irqnr, [\irqstat, #AITC_NIVECSR]

		ldr	\irqstat, [\base, #AITC_NIVECSR]

		@ Shift off the priority leaving the offset or

		@ "interrupt number"

		mov	\irqnr, \irqnr, lsr #16

 		ldr	\irqstat, =1	@ dummy compare

		ldr	\base, =0xFFFF		// invalid interrupt

		cmp	\irqnr, \base

		bne	1001f

		ldr	\irqstat, =0

1001:

		tst	\irqstat, #1	@ to make the condition code = TRUE

		@ "interrupt number", use arithmetic shift to

		@ transform illegal source (0xffff) as -1

		mov	\irqnr, \irqstat, asr #16

		adds	\tmp, \irqnr, #1

		.endm