diff options
Diffstat (limited to 'arch/sh/kernel/cpu')
| -rw-r--r-- | arch/sh/kernel/cpu/irq/intc.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/arch/sh/kernel/cpu/irq/intc.c b/arch/sh/kernel/cpu/irq/intc.c index d609a8ccd45..481871fee1a 100644 --- a/arch/sh/kernel/cpu/irq/intc.c +++ b/arch/sh/kernel/cpu/irq/intc.c @@ -206,6 +206,18 @@ static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp, { int i; + /* this doesn't scale well, but... + * + * this function should only be used for cerain uncommon + * operations such as intc_set_priority() and intc_set_sense() + * and in those rare cases performance doesn't matter that much. + * keeping the memory footprint low is more important. + * + * one rather simple way to speed this up and still keep the + * memory footprint down is to make sure the array is sorted + * and then perform a bisect to lookup the irq. + */ + for (i = 0; i < nr_hp; i++) { if ((hp + i)->irq != irq) continue; @@ -226,7 +238,7 @@ int intc_set_priority(unsigned int irq, unsigned int prio) ihp = intc_find_irq(d->prio, d->nr_prio, irq); if (ihp) { - if (prio >= ((1 << _INTC_WIDTH(ihp->handle)) - 1)) + if (prio >= (1 << _INTC_WIDTH(ihp->handle))) return -EINVAL; intc_prio_level[irq] = prio; @@ -237,7 +249,7 @@ int intc_set_priority(unsigned int irq, unsigned int prio) * priority level will be set during next enable() */ - if (ihp->handle) + if (_INTC_FN(ihp->handle) != REG_FN_ERR) _intc_enable(irq, ihp->handle); } return 0; @@ -457,6 +469,7 @@ static void __init intc_register_irq(struct intc_desc *desc, intc_enum enum_id, unsigned int irq) { + struct intc_handle_int *hp; unsigned int data[2], primary; /* Prefer single interrupt source bitmap over other combinations: @@ -495,9 +508,19 @@ static void __init intc_register_irq(struct intc_desc *desc, /* add irq to d->prio list if priority is available */ if (data[1]) { - (d->prio + d->nr_prio)->irq = irq; - if (!primary) /* only secondary priority can access regs */ - (d->prio + d->nr_prio)->handle = data[1]; + hp = d->prio + d->nr_prio; + hp->irq = irq; + hp->handle = data[1]; + + if (primary) { + /* + * only secondary priority should access registers, so + * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority() + */ + + hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0); + hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0); + } d->nr_prio++; } |