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irqchip/atmel-aic5: Handle suspend to RAM 

On sama5d2, VDD core may be cut while suspending to RAM. This means the
AIC5 registers content is lost. Restore it at resume time.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
pull/13/head
Alexandre Belloni 2017-04-10 16:50:11 +02:00 committed by Marc Zyngier
parent 9dbbbd33aa
commit a50ac562ef
1 changed files with 28 additions and 1 deletions
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29
drivers/irqchip/irq-atmel-aic5.c
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@ -150,6 +150,8 @@ static int aic5_set_type(struct irq_data *d, unsigned type)
}
#ifdef CONFIG_PM
static u32 *smr_cache;
static void aic5_suspend(struct irq_data *d)
{
struct irq_domain *domain = d->domain;
@ -159,6 +161,12 @@ static void aic5_suspend(struct irq_data *d)
int i;
u32 mask;
if (smr_cache)
for (i = 0; i < domain->revmap_size; i++) {
irq_reg_writel(bgc, i, AT91_AIC5_SSR);
smr_cache[i] = irq_reg_readl(bgc, AT91_AIC5_SMR);
}
irq_gc_lock(bgc);
for (i = 0; i < dgc->irqs_per_chip; i++) {
mask = 1 << i;
@ -184,9 +192,21 @@ static void aic5_resume(struct irq_data *d)
u32 mask;
irq_gc_lock(bgc);
if (smr_cache) {
irq_reg_writel(bgc, 0xffffffff, AT91_AIC5_SPU);
for (i = 0; i < domain->revmap_size; i++) {
irq_reg_writel(bgc, i, AT91_AIC5_SSR);
irq_reg_writel(bgc, i, AT91_AIC5_SVR);
irq_reg_writel(bgc, smr_cache[i], AT91_AIC5_SMR);
}
}
for (i = 0; i < dgc->irqs_per_chip; i++) {
mask = 1 << i;
if ((mask & gc->mask_cache) == (mask & gc->wake_active))
if (!smr_cache &&
((mask & gc->mask_cache) == (mask & gc->wake_active)))
continue;
irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
@ -342,6 +362,13 @@ static int __init aic5_of_init(struct device_node *node,
static int __init sama5d2_aic5_of_init(struct device_node *node,
struct device_node *parent)
{
#ifdef CONFIG_PM
smr_cache = kcalloc(DIV_ROUND_UP(NR_SAMA5D2_IRQS, 32) * 32,
sizeof(*smr_cache), GFP_KERNEL);
if (!smr_cache)
return -ENOMEM;
#endif
return aic5_of_init(node, parent, NR_SAMA5D2_IRQS);
}
IRQCHIP_DECLARE(sama5d2_aic5, "atmel,sama5d2-aic", sama5d2_aic5_of_init);