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: 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
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 86fa61a..63fbf00 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1145,6 +1145,9 @@
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;
diff --git a/drivers/irqchip/irq-loongarch-cpu.c b/drivers/irqchip/irq-loongarch-cpu.c
index 28ddc60..327f3ab 100644
--- a/drivers/irqchip/irq-loongarch-cpu.c
+++ b/drivers/irqchip/irq-loongarch-cpu.c
@@ -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 @@
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;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e2b60d5..76520f3 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -105,6 +105,7 @@
ACPI_IRQ_MODEL_IOSAPIC,
ACPI_IRQ_MODEL_PLATFORM,
ACPI_IRQ_MODEL_GIC,
+ ACPI_IRQ_MODEL_LPIC,
ACPI_IRQ_MODEL_COUNT
};
