diff options
| -rw-r--r-- | arch/powerpc/sysdev/uic.c | 81 |
1 files changed, 19 insertions, 62 deletions
diff --git a/arch/powerpc/sysdev/uic.c b/arch/powerpc/sysdev/uic.c index 847a549..ba02498 100644 --- a/arch/powerpc/sysdev/uic.c +++ b/arch/powerpc/sysdev/uic.c @@ -60,14 +60,19 @@ struct uic { static void uic_unmask_irq(unsigned int virq) { + struct irq_desc *desc = get_irq_desc(virq); struct uic *uic = get_irq_chip_data(virq); unsigned int src = uic_irq_to_hw(virq); unsigned long flags; - u32 er; + u32 er, sr; + sr = 1 << (31-src); spin_lock_irqsave(&uic->lock, flags); + /* ack level-triggered interrupts here */ + if (desc->status & IRQ_LEVEL) + mtdcr(uic->dcrbase + UIC_SR, sr); er = mfdcr(uic->dcrbase + UIC_ER); - er |= 1 << (31 - src); + er |= sr; mtdcr(uic->dcrbase + UIC_ER, er); spin_unlock_irqrestore(&uic->lock, flags); } @@ -99,6 +104,7 @@ static void uic_ack_irq(unsigned int virq) static void uic_mask_ack_irq(unsigned int virq) { + struct irq_desc *desc = get_irq_desc(virq); struct uic *uic = get_irq_chip_data(virq); unsigned int src = uic_irq_to_hw(virq); unsigned long flags; @@ -109,7 +115,16 @@ static void uic_mask_ack_irq(unsigned int virq) er = mfdcr(uic->dcrbase + UIC_ER); er &= ~sr; mtdcr(uic->dcrbase + UIC_ER, er); - mtdcr(uic->dcrbase + UIC_SR, sr); + /* On the UIC, acking (i.e. clearing the SR bit) + * a level irq will have no effect if the interrupt + * is still asserted by the device, even if + * the interrupt is already masked. Therefore + * we only ack the egde interrupts here, while + * level interrupts are ack'ed after the actual + * isr call in the uic_unmask_irq() + */ + if (!(desc->status & IRQ_LEVEL)) + mtdcr(uic->dcrbase + UIC_SR, sr); spin_unlock_irqrestore(&uic->lock, flags); } @@ -173,64 +188,6 @@ static struct irq_chip uic_irq_chip = { .set_type = uic_set_irq_type, }; -/** - * handle_uic_irq - irq flow handler for UIC - * @irq: the interrupt number - * @desc: the interrupt description structure for this irq - * - * This is modified version of the generic handle_level_irq() suitable - * for the UIC. On the UIC, acking (i.e. clearing the SR bit) a level - * irq will have no effect if the interrupt is still asserted by the - * device, even if the interrupt is already masked. Therefore, unlike - * the standard handle_level_irq(), we must ack the interrupt *after* - * invoking the ISR (which should have de-asserted the interrupt in - * the external source). For edge interrupts we ack at the beginning - * instead of the end, to keep the window in which we can miss an - * interrupt as small as possible. - */ -void fastcall handle_uic_irq(unsigned int irq, struct irq_desc *desc) -{ - unsigned int cpu = smp_processor_id(); - struct irqaction *action; - irqreturn_t action_ret; - - spin_lock(&desc->lock); - if (desc->status & IRQ_LEVEL) - desc->chip->mask(irq); - else - desc->chip->mask_ack(irq); - - if (unlikely(desc->status & IRQ_INPROGRESS)) - goto out_unlock; - desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); - kstat_cpu(cpu).irqs[irq]++; - - /* - * If its disabled or no action available - * keep it masked and get out of here - */ - action = desc->action; - if (unlikely(!action || (desc->status & IRQ_DISABLED))) { - desc->status |= IRQ_PENDING; - goto out_unlock; - } - - desc->status |= IRQ_INPROGRESS; - desc->status &= ~IRQ_PENDING; - spin_unlock(&desc->lock); - - action_ret = handle_IRQ_event(irq, action); - - spin_lock(&desc->lock); - desc->status &= ~IRQ_INPROGRESS; - if (desc->status & IRQ_LEVEL) - desc->chip->ack(irq); - if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask) - desc->chip->unmask(irq); -out_unlock: - spin_unlock(&desc->lock); -} - static int uic_host_map(struct irq_host *h, unsigned int virq, irq_hw_number_t hw) { @@ -239,7 +196,7 @@ static int uic_host_map(struct irq_host *h, unsigned int virq, set_irq_chip_data(virq, uic); /* Despite the name, handle_level_irq() works for both level * and edge irqs on UIC. FIXME: check this is correct */ - set_irq_chip_and_handler(virq, &uic_irq_chip, handle_uic_irq); + set_irq_chip_and_handler(virq, &uic_irq_chip, handle_level_irq); /* Set default irq type */ set_irq_type(virq, IRQ_TYPE_NONE); |