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irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch

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For LoongArch, ACPI_IRQ_MODEL_LPIC is introduced, and then the
callback acpi_get_gsi_domain_id and acpi_gsi_to_irq_fallback are
implemented.

The acpi_get_gsi_domain_id callback returns related fwnode handle
of irqdomain for different GSI range.

The acpi_gsi_to_irq_fallback will create new mapping for gsi when
the mapping of it is not found.

Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1658314292-35346-14-git-send-email-lvjianmin@loongson.cn
This commit is contained in:
Jianmin Lv 2022-07-20 18:51:32 +08:00 committed by Marc Zyngier
parent b2d3e3354e
commit e8bba72b39
3 changed files with 41 additions and 0 deletions
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3
drivers/acpi/bus.c
View file

@ -1145,6 +1145,9 @@ static int __init acpi_bus_init_irq(void)
case ACPI_IRQ_MODEL_PLATFORM:
message = "platform specific model";
break;
case ACPI_IRQ_MODEL_LPIC:
message = "LPIC";
break;
default:
pr_info("Unknown interrupt routing model\n");
return -ENODEV;

37
drivers/irqchip/irq-loongarch-cpu.c
View file

@ -16,6 +16,41 @@
static struct irq_domain *irq_domain;
struct fwnode_handle *cpuintc_handle;
static u32 lpic_gsi_to_irq(u32 gsi)
{
/* Only pch irqdomain transferring is required for LoongArch. */
if (gsi >= GSI_MIN_PCH_IRQ && gsi <= GSI_MAX_PCH_IRQ)
return acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
return 0;
}
static struct fwnode_handle *lpic_get_gsi_domain_id(u32 gsi)
{
int id;
struct fwnode_handle *domain_handle = NULL;
switch (gsi) {
case GSI_MIN_CPU_IRQ ... GSI_MAX_CPU_IRQ:
if (liointc_handle)
domain_handle = liointc_handle;
break;
case GSI_MIN_LPC_IRQ ... GSI_MAX_LPC_IRQ:
if (pch_lpc_handle)
domain_handle = pch_lpc_handle;
break;
case GSI_MIN_PCH_IRQ ... GSI_MAX_PCH_IRQ:
id = find_pch_pic(gsi);
if (id >= 0 && pch_pic_handle[id])
domain_handle = pch_pic_handle[id];
break;
}
return domain_handle;
}
static void mask_loongarch_irq(struct irq_data *d)
{
clear_csr_ecfg(ECFGF(d->hwirq));
@ -102,6 +137,8 @@ static int __init cpuintc_acpi_init(union acpi_subtable_headers *header,
panic("Failed to add irqdomain for LoongArch CPU");
set_handle_irq(&handle_cpu_irq);
acpi_set_irq_model(ACPI_IRQ_MODEL_LPIC, lpic_get_gsi_domain_id);
acpi_set_gsi_to_irq_fallback(lpic_gsi_to_irq);
acpi_cascade_irqdomain_init();
return 0;

1
include/linux/acpi.h
View file

@ -105,6 +105,7 @@ enum acpi_irq_model_id {
ACPI_IRQ_MODEL_IOSAPIC,
ACPI_IRQ_MODEL_PLATFORM,
ACPI_IRQ_MODEL_GIC,
ACPI_IRQ_MODEL_LPIC,
ACPI_IRQ_MODEL_COUNT
};