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Optimise reading of pending interrupt registers. If there are no

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pending interrupt bits, skip the bit iteration loop.

Reviewed by:	ian @
This commit is contained in:
Hans Petter Selasky 2014-05-20 15:03:23 +00:00
parent e887c1dedf
commit 5c657683bb
1 changed files with 27 additions and 19 deletions
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46
sys/arm/broadcom/bcm2835/bcm2835_intr.c
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@ -60,6 +60,7 @@ __FBSDID("$FreeBSD$");
#define BANK1_END (BANK1_START + 32 - 1)
#define BANK2_START (BANK1_START + 32)
#define BANK2_END (BANK2_START + 32 - 1)
#define BANK3_START (BANK2_START + 32)
#define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START))
#define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END))
@ -150,29 +151,36 @@ arm_get_next_irq(int last_irq)
/* Sanity check */
if (irq < 0)
irq = 0;
/* TODO: should we mask last_irq? */
pending = intc_read_4(INTC_PENDING_BASIC);
while (irq < BANK1_START) {
if (pending & (1 << irq))
return irq;
irq++;
if (irq < BANK1_START) {
pending = intc_read_4(INTC_PENDING_BASIC);
if ((pending & 0xFF) == 0) {
irq = BANK1_START; /* skip to next bank */
} else do {
if (pending & (1 << irq))
return irq;
irq++;
} while (irq < BANK1_START);
}
pending = intc_read_4(INTC_PENDING_BANK1);
while (irq < BANK2_START) {
if (pending & (1 << IRQ_BANK1(irq)))
return irq;
irq++;
if (irq < BANK2_START) {
pending = intc_read_4(INTC_PENDING_BANK1);
if (pending == 0) {
irq = BANK2_START; /* skip to next bank */
} else do {
if (pending & (1 << IRQ_BANK1(irq)))
return irq;
irq++;
} while (irq < BANK2_START);
}
pending = intc_read_4(INTC_PENDING_BANK2);
while (irq <= BANK2_END) {
if (pending & (1 << IRQ_BANK2(irq)))
return irq;
irq++;
if (irq < BANK3_START) {
pending = intc_read_4(INTC_PENDING_BANK2);
if (pending != 0) do {
if (pending & (1 << IRQ_BANK2(irq)))
return irq;
irq++;
} while (irq < BANK3_START);
}
return (-1);
}