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Commit 80fcdb95 authored by Mike Frysinger's avatar Mike Frysinger
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Blackfin: SIC: cut down on IAR MMR reads a bit 



Tweak the for loops that operate on the SIC IAR system MMRs to avoid
re-reading them multiple times in a row.  System MMRs are a little
slower to access, so avoid the penalty when possible.

Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 11cabcb9

arch/blackfin/mach-common/ints-priority.c

+18 −15
Original line number Diff line number Diff line
@@ -92,22 +92,24 @@ static void __init search_IAR(void) 
{

	unsigned ivg, irq_pos = 0;

	for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {

		int irqn;

		int irqN;



		ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];



		for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {

			int iar_shift = (irqn & 7) * 4;

				if (ivg == (0xf &

#if defined(CONFIG_BF52x) || defined(CONFIG_BF538) \

	|| defined(CONFIG_BF539) || defined(CONFIG_BF51x)

			     bfin_read32((unsigned long *)SIC_IAR0 +

					 ((irqn % 32) >> 3) + ((irqn / 32) *

					 ((SIC_IAR4 - SIC_IAR0) / 4))) >> iar_shift)) {

		for (irqN = 0; irqN < NR_PERI_INTS; irqN += 4) {

			int irqn;

			u32 iar = bfin_read32((unsigned long *)SIC_IAR0 +

#if defined(CONFIG_BF51x) || defined(CONFIG_BF52x) || \

	defined(CONFIG_BF538) || defined(CONFIG_BF539)

				((irqN % 32) >> 3) + ((irqN / 32) * ((SIC_IAR4 - SIC_IAR0) / 4))

#else

			     bfin_read32((unsigned long *)SIC_IAR0 +

					 (irqn >> 3)) >> iar_shift)) {

				(irqN >> 3)

#endif

				);



			for (irqn = irqN; irqn < irqN + 4; ++irqn) {

				int iar_shift = (irqn & 7) * 4;

				if (ivg == (0xf & (iar >> iar_shift))) {

					ivg_table[irq_pos].irqno = IVG7 + irqn;

					ivg_table[irq_pos].isrflag = 1 << (irqn % 32);

					ivg7_13[ivg].istop++;
@@ -116,6 +118,7 @@ static void __init search_IAR(void) 
			}

		}

	}

}



/*

 * This is for core internal IRQs