diff options
Diffstat (limited to 'arch/arc/kernel/irq.c')
| -rw-r--r-- | arch/arc/kernel/irq.c | 53 |
1 files changed, 41 insertions, 12 deletions
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c index 7d653c0d0773..620ec2fe32a9 100644 --- a/arch/arc/kernel/irq.c +++ b/arch/arc/kernel/irq.c @@ -19,21 +19,16 @@ /* * Early Hardware specific Interrupt setup + * -Platform independent, needed for each CPU (not foldable into init_IRQ) * -Called very early (start_kernel -> setup_arch -> setup_processor) - * -Platform Independent (must for any ARC700) - * -Needed for each CPU (hence not foldable into init_IRQ) * * what it does ? - * -Disable all IRQs (on CPU side) * -Optionally, setup the High priority Interrupts as Level 2 IRQs */ void arc_init_IRQ(void) { int level_mask = 0; - /* Disable all IRQs: enable them as devices request */ - write_aux_reg(AUX_IENABLE, 0); - /* setup any high priority Interrupts (Level2 in ARCompact jargon) */ level_mask |= IS_ENABLED(CONFIG_ARC_IRQ3_LV2) << 3; level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5; @@ -60,20 +55,28 @@ void arc_init_IRQ(void) * below, per IRQ. */ -static void arc_mask_irq(struct irq_data *data) +static void arc_irq_mask(struct irq_data *data) { - arch_mask_irq(data->irq); + unsigned int ienb; + + ienb = read_aux_reg(AUX_IENABLE); + ienb &= ~(1 << data->irq); + write_aux_reg(AUX_IENABLE, ienb); } -static void arc_unmask_irq(struct irq_data *data) +static void arc_irq_unmask(struct irq_data *data) { - arch_unmask_irq(data->irq); + unsigned int ienb; + + ienb = read_aux_reg(AUX_IENABLE); + ienb |= (1 << data->irq); + write_aux_reg(AUX_IENABLE, ienb); } static struct irq_chip onchip_intc = { .name = "ARC In-core Intc", - .irq_mask = arc_mask_irq, - .irq_unmask = arc_unmask_irq, + .irq_mask = arc_irq_mask, + .irq_unmask = arc_irq_unmask, }; static int arc_intc_domain_map(struct irq_domain *d, unsigned int irq, @@ -150,6 +153,32 @@ void arch_do_IRQ(unsigned int irq, struct pt_regs *regs) set_irq_regs(old_regs); } +void arc_request_percpu_irq(int irq, int cpu, + irqreturn_t (*isr)(int irq, void *dev), + const char *irq_nm, + void *percpu_dev) +{ + /* Boot cpu calls request, all call enable */ + if (!cpu) { + int rc; + + /* + * These 2 calls are essential to making percpu IRQ APIs work + * Ideally these details could be hidden in irq chip map function + * but the issue is IPIs IRQs being static (non-DT) and platform + * specific, so we can't identify them there. + */ + irq_set_percpu_devid(irq); + irq_modify_status(irq, IRQ_NOAUTOEN, 0); /* @irq, @clr, @set */ + + rc = request_percpu_irq(irq, isr, irq_nm, percpu_dev); + if (rc) + panic("Percpu IRQ request failed for %d\n", irq); + } + + enable_percpu_irq(irq, 0); +} + /* * arch_local_irq_enable - Enable interrupts. * |