diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/irqchip/irq-bcm7038-l1.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-bcm7038-l1.c b/drivers/irqchip/irq-bcm7038-l1.c index fc75c61233aa..689e487be80c 100644 --- a/drivers/irqchip/irq-bcm7038-l1.c +++ b/drivers/irqchip/irq-bcm7038-l1.c @@ -27,6 +27,7 @@ #include <linux/types.h> #include <linux/irqchip.h> #include <linux/irqchip/chained_irq.h> +#include <linux/syscore_ops.h> #define IRQS_PER_WORD 32 #define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 4) @@ -39,6 +40,10 @@ struct bcm7038_l1_chip { unsigned int n_words; struct irq_domain *domain; struct bcm7038_l1_cpu *cpus[NR_CPUS]; +#ifdef CONFIG_PM_SLEEP + struct list_head list; + u32 wake_mask[MAX_WORDS]; +#endif u8 affinity[MAX_WORDS * IRQS_PER_WORD]; }; @@ -287,6 +292,77 @@ static int __init bcm7038_l1_init_one(struct device_node *dn, return 0; } +#ifdef CONFIG_PM_SLEEP +/* + * We keep a list of bcm7038_l1_chip used for suspend/resume. This hack is + * used because the struct chip_type suspend/resume hooks are not called + * unless chip_type is hooked onto a generic_chip. Since this driver does + * not use generic_chip, we need to manually hook our resume/suspend to + * syscore_ops. + */ +static LIST_HEAD(bcm7038_l1_intcs_list); +static DEFINE_RAW_SPINLOCK(bcm7038_l1_intcs_lock); + +static int bcm7038_l1_suspend(void) +{ + struct bcm7038_l1_chip *intc; + int boot_cpu, word; + + /* Wakeup interrupt should only come from the boot cpu */ + boot_cpu = cpu_logical_map(0); + + list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) { + for (word = 0; word < intc->n_words; word++) { + l1_writel(~intc->wake_mask[word], + intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word)); + l1_writel(intc->wake_mask[word], + intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word)); + } + } + + return 0; +} + +static void bcm7038_l1_resume(void) +{ + struct bcm7038_l1_chip *intc; + int boot_cpu, word; + + boot_cpu = cpu_logical_map(0); + + list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) { + for (word = 0; word < intc->n_words; word++) { + l1_writel(intc->cpus[boot_cpu]->mask_cache[word], + intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word)); + l1_writel(~intc->cpus[boot_cpu]->mask_cache[word], + intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word)); + } + } +} + +static struct syscore_ops bcm7038_l1_syscore_ops = { + .suspend = bcm7038_l1_suspend, + .resume = bcm7038_l1_resume, +}; + +static int bcm7038_l1_set_wake(struct irq_data *d, unsigned int on) +{ + struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d); + unsigned long flags; + u32 word = d->hwirq / IRQS_PER_WORD; + u32 mask = BIT(d->hwirq % IRQS_PER_WORD); + + raw_spin_lock_irqsave(&intc->lock, flags); + if (on) + intc->wake_mask[word] |= mask; + else + intc->wake_mask[word] &= ~mask; + raw_spin_unlock_irqrestore(&intc->lock, flags); + + return 0; +} +#endif + static struct irq_chip bcm7038_l1_irq_chip = { .name = "bcm7038-l1", .irq_mask = bcm7038_l1_mask, @@ -295,6 +371,9 @@ static struct irq_chip bcm7038_l1_irq_chip = { #ifdef CONFIG_SMP .irq_cpu_offline = bcm7038_l1_cpu_offline, #endif +#ifdef CONFIG_PM_SLEEP + .irq_set_wake = bcm7038_l1_set_wake, +#endif }; static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq, @@ -340,6 +419,16 @@ int __init bcm7038_l1_of_init(struct device_node *dn, goto out_unmap; } +#ifdef CONFIG_PM_SLEEP + /* Add bcm7038_l1_chip into a list */ + raw_spin_lock(&bcm7038_l1_intcs_lock); + list_add_tail(&intc->list, &bcm7038_l1_intcs_list); + raw_spin_unlock(&bcm7038_l1_intcs_lock); + + if (list_is_singular(&bcm7038_l1_intcs_list)) + register_syscore_ops(&bcm7038_l1_syscore_ops); +#endif + pr_info("registered BCM7038 L1 intc (%pOF, IRQs: %d)\n", dn, IRQS_PER_WORD * intc->n_words); |