Commit e8bba72b authored by Jianmin Lv's avatar Jianmin Lv Committed by Marc Zyngier
Browse files

irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch 



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: default avatarJianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1658314292-35346-14-git-send-email-lvjianmin@loongson.cn
parent b2d3e335

drivers/acpi/bus.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

drivers/irqchip/irq-loongarch-cpu.c

+37 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -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

};