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irqchip/irq-mst: Support polarity configuration

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Support irq polarity configuration and save and restore the config
when system suspend and resume.

Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
[maz: fixed irq_set_type callback]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210315131848.31840-1-mark-pk.tsai@mediatek.com
This commit is contained in:
Mark-PK Tsai 2021-03-15 21:18:48 +08:00 committed by Marc Zyngier
parent fead4dd496
commit ea4aeaa5c8
1 changed files with 95 additions and 3 deletions
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94
drivers/irqchip/irq-mst-intc.c
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@ -13,15 +13,27 @@
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/syscore_ops.h>
#define MST_INTC_MAX_IRQS 64
#define INTC_MASK 0x0
#define INTC_REV_POLARITY 0x10
#define INTC_EOI 0x20
#ifdef CONFIG_PM_SLEEP
static LIST_HEAD(mst_intc_list);
#endif
struct mst_intc_chip_data {
raw_spinlock_t lock;
unsigned int irq_start, nr_irqs;
void __iomem *base;
bool no_eoi;
#ifdef CONFIG_PM_SLEEP
struct list_head entry;
u16 saved_polarity_conf[DIV_ROUND_UP(MST_INTC_MAX_IRQS, 16)];
#endif
};
static void mst_set_irq(struct irq_data *d, u32 offset)
@ -78,6 +90,24 @@ static void mst_intc_eoi_irq(struct irq_data *d)
irq_chip_eoi_parent(d);
}
static int mst_irq_chip_set_type(struct irq_data *data, unsigned int type)
{
switch (type) {
case IRQ_TYPE_LEVEL_LOW:
case IRQ_TYPE_EDGE_FALLING:
mst_set_irq(data, INTC_REV_POLARITY);
break;
case IRQ_TYPE_LEVEL_HIGH:
case IRQ_TYPE_EDGE_RISING:
mst_clear_irq(data, INTC_REV_POLARITY);
break;
default:
return -EINVAL;
}
return irq_chip_set_type_parent(data, IRQ_TYPE_LEVEL_HIGH);
}
static struct irq_chip mst_intc_chip = {
.name = "mst-intc",
.irq_mask = mst_intc_mask_irq,
@ -87,13 +117,62 @@ static struct irq_chip mst_intc_chip = {
.irq_set_irqchip_state = irq_chip_set_parent_state,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
.irq_set_type = irq_chip_set_type_parent,
.irq_set_type = mst_irq_chip_set_type,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
};
#ifdef CONFIG_PM_SLEEP
static void mst_intc_polarity_save(struct mst_intc_chip_data *cd)
{
int i;
void __iomem *addr = cd->base + INTC_REV_POLARITY;
for (i = 0; i < DIV_ROUND_UP(cd->nr_irqs, 16); i++)
cd->saved_polarity_conf[i] = readw_relaxed(addr + i * 4);
}
static void mst_intc_polarity_restore(struct mst_intc_chip_data *cd)
{
int i;
void __iomem *addr = cd->base + INTC_REV_POLARITY;
for (i = 0; i < DIV_ROUND_UP(cd->nr_irqs, 16); i++)
writew_relaxed(cd->saved_polarity_conf[i], addr + i * 4);
}
static void mst_irq_resume(void)
{
struct mst_intc_chip_data *cd;
list_for_each_entry(cd, &mst_intc_list, entry)
mst_intc_polarity_restore(cd);
}
static int mst_irq_suspend(void)
{
struct mst_intc_chip_data *cd;
list_for_each_entry(cd, &mst_intc_list, entry)
mst_intc_polarity_save(cd);
return 0;
}
static struct syscore_ops mst_irq_syscore_ops = {
.suspend = mst_irq_suspend,
.resume = mst_irq_resume,
};
static int __init mst_irq_pm_init(void)
{
register_syscore_ops(&mst_irq_syscore_ops);
return 0;
}
late_initcall(mst_irq_pm_init);
#endif
static int mst_intc_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *hwirq,
@ -145,6 +224,15 @@ static int mst_intc_domain_alloc(struct irq_domain *domain, unsigned int virq,
parent_fwspec = *fwspec;
parent_fwspec.fwnode = domain->parent->fwnode;
parent_fwspec.param[1] = cd->irq_start + hwirq;
/*
* mst-intc latch the interrupt request if it's edge triggered,
* so the output signal to parent GIC is always level sensitive.
* And if the irq signal is active low, configure it to active high
* to meet GIC SPI spec in mst_irq_chip_set_type via REV_POLARITY bit.
*/
parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_fwspec);
}
@ -193,6 +281,10 @@ static int __init mst_intc_of_init(struct device_node *dn,
return -ENOMEM;
}
#ifdef CONFIG_PM_SLEEP
INIT_LIST_HEAD(&cd->entry);
list_add_tail(&cd->entry, &mst_intc_list);
#endif
return 0;
}