diff options
| author | Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> | 2007-12-11 16:52:50 +0100 |
|---|---|---|
| committer | Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> | 2008-03-31 10:33:11 +0200 |
| commit | ed6f5987235c628e1041311d7c1efdf659e2dad7 (patch) | |
| tree | f0580d8d1531608020874ddb30e06dd690ecefa9 | |
| parent | 5e69b945f20aec17bf057acbb61b6682461e7149 (diff) | |
| download | lwn-ed6f5987235c628e1041311d7c1efdf659e2dad7.tar.gz lwn-ed6f5987235c628e1041311d7c1efdf659e2dad7.zip | |
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>
| -rw-r--r-- | arch/arm/mach-ns9xxx/irq.c | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/arch/arm/mach-ns9xxx/irq.c b/arch/arm/mach-ns9xxx/irq.c index 7ddc8fde7748..36e5835e6097 100644 --- a/arch/arm/mach-ns9xxx/irq.c +++ b/arch/arm/mach-ns9xxx/irq.c @@ -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); |