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ns9xxx: add support for irq priorisation 

prio2irq(0) is the highest prioritized interrupt.  For now there is no
binary change intended.

If you intend to change the priorisation, you have to assert:

	∀ x ∈ {0, 1, ⋯ 31}: (irq2prio ∘ prio2irq)(x) = x

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
This commit is contained in:
Uwe Kleine-König 2007-12-11 16:52:50 +01:00
parent 5e69b945f2
commit ed6f598723
1 changed files with 18 additions and 12 deletions
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30
arch/arm/mach-ns9xxx/irq.c
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@ -19,12 +19,17 @@
#include "generic.h"
/* simple interrupt prio table: prio(x) < prio(y) <=> x < y */
#define irq2prio(i) (i)
#define prio2irq(p) (p)
static void ns9xxx_mask_irq(unsigned int irq)
{
/* XXX: better use cpp symbols */
u32 ic = __raw_readl(SYS_IC(irq / 4));
ic &= ~(1 << (7 + 8 * (3 - (irq & 3))));
__raw_writel(ic, SYS_IC(irq / 4));
int prio = irq2prio(irq);
u32 ic = __raw_readl(SYS_IC(prio / 4));
ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));
__raw_writel(ic, SYS_IC(prio / 4));
}
static void ns9xxx_ack_irq(unsigned int irq)
@ -41,9 +46,10 @@ static void ns9xxx_maskack_irq(unsigned int irq)
static void ns9xxx_unmask_irq(unsigned int irq)
{
/* XXX: better use cpp symbols */
u32 ic = __raw_readl(SYS_IC(irq / 4));
ic |= 1 << (7 + 8 * (3 - (irq & 3)));
__raw_writel(ic, SYS_IC(irq / 4));
int prio = irq2prio(irq);
u32 ic = __raw_readl(SYS_IC(prio / 4));
ic |= 1 << (7 + 8 * (3 - (prio & 3)));
__raw_writel(ic, SYS_IC(prio / 4));
}
static struct irq_chip ns9xxx_chip = {
@ -96,14 +102,14 @@ void __init ns9xxx_init_irq(void)
/* disable all IRQs */
for (i = 0; i < 8; ++i)
__raw_writel((4 * i) << 24 | (4 * i + 1) << 16 |
(4 * i + 2) << 8 | (4 * i + 3), SYS_IC(i));
__raw_writel(prio2irq(4 * i) << 24 |
prio2irq(4 * i + 1) << 16 |
prio2irq(4 * i + 2) << 8 |
prio2irq(4 * i + 3),
SYS_IC(i));
/* simple interrupt prio table:
* prio(x) < prio(y) <=> x < y
*/
for (i = 0; i < 32; ++i)
__raw_writel(i, SYS_IVA(i));
__raw_writel(prio2irq(i), SYS_IVA(i));
for (i = 0; i <= 31; ++i) {
set_irq_chip(i, &ns9xxx_chip);