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irqchip/loongson-pch-pic: Add suspend/resume support

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Add suspend/resume support for PCH-PIC irqchip, which is needed for
upcoming suspend/hibernation.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020073527.541845-4-chenhuacai@loongson.cn
This commit is contained in:
Huacai Chen 2022-10-20 15:35:26 +08:00 committed by Marc Zyngier
parent a90335c2df
commit 1ed008a2c3
1 changed files with 47 additions and 0 deletions
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47
drivers/irqchip/irq-loongson-pch-pic.c
View file

@ -15,6 +15,7 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/syscore_ops.h>
/* Registers */
#define PCH_PIC_MASK 0x20
@ -42,6 +43,9 @@ struct pch_pic {
raw_spinlock_t pic_lock;
u32 vec_count;
u32 gsi_base;
u32 saved_vec_en[PIC_REG_COUNT];
u32 saved_vec_pol[PIC_REG_COUNT];
u32 saved_vec_edge[PIC_REG_COUNT];
};
static struct pch_pic *pch_pic_priv[MAX_IO_PICS];
@ -145,6 +149,7 @@ static struct irq_chip pch_pic_irq_chip = {
.irq_ack = pch_pic_ack_irq,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_set_type = pch_pic_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static int pch_pic_domain_translate(struct irq_domain *d,
@ -234,6 +239,46 @@ static void pch_pic_reset(struct pch_pic *priv)
}
}
static int pch_pic_suspend(void)
{
int i, j;
for (i = 0; i < nr_pics; i++) {
for (j = 0; j < PIC_REG_COUNT; j++) {
pch_pic_priv[i]->saved_vec_pol[j] =
readl(pch_pic_priv[i]->base + PCH_PIC_POL + 4 * j);
pch_pic_priv[i]->saved_vec_edge[j] =
readl(pch_pic_priv[i]->base + PCH_PIC_EDGE + 4 * j);
pch_pic_priv[i]->saved_vec_en[j] =
readl(pch_pic_priv[i]->base + PCH_PIC_MASK + 4 * j);
}
}
return 0;
}
static void pch_pic_resume(void)
{
int i, j;
for (i = 0; i < nr_pics; i++) {
pch_pic_reset(pch_pic_priv[i]);
for (j = 0; j < PIC_REG_COUNT; j++) {
writel(pch_pic_priv[i]->saved_vec_pol[j],
pch_pic_priv[i]->base + PCH_PIC_POL + 4 * j);
writel(pch_pic_priv[i]->saved_vec_edge[j],
pch_pic_priv[i]->base + PCH_PIC_EDGE + 4 * j);
writel(pch_pic_priv[i]->saved_vec_en[j],
pch_pic_priv[i]->base + PCH_PIC_MASK + 4 * j);
}
}
}
static struct syscore_ops pch_pic_syscore_ops = {
.suspend = pch_pic_suspend,
.resume = pch_pic_resume,
};
static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
struct irq_domain *parent_domain, struct fwnode_handle *domain_handle,
u32 gsi_base)
@ -266,6 +311,8 @@ static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
pch_pic_handle[nr_pics] = domain_handle;
pch_pic_priv[nr_pics++] = priv;
register_syscore_ops(&pch_pic_syscore_ops);
return 0;
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