linux-kernel - [irqchip: irq/irqchip-next] irqchip / ACPI: Introduce ACPI_IRQ_MODEL

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Message-ID: <165831644861.15455.676425418656075059.tip-bot2@tip-bot2>
Date:   Wed, 20 Jul 2022 11:27:28 -0000
From:   "irqchip-bot for Jianmin Lv" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>, Marc Zyngier <maz@...nel.org>,
        tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] irqchip / ACPI: Introduce
 ACPI_IRQ_MODEL_LPIC for LoongArch

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     e8bba72b396cef7c919c73710f3c5884521adb4e
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/e8bba72b396cef7c919c73710f3c5884521adb4e
Author:        Jianmin Lv <lvjianmin@...ngson.cn>
AuthorDate:    Wed, 20 Jul 2022 18:51:32 +08:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Wed, 20 Jul 2022 12:09:21 +01:00

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@...ngson.cn>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/1658314292-35346-14-git-send-email-lvjianmin@loongson.cn
---
 drivers/acpi/bus.c                  |  3 ++-
 drivers/irqchip/irq-loongarch-cpu.c | 37 ++++++++++++++++++++++++++++-
 include/linux/acpi.h                |  1 +-
 3 files changed, 41 insertions(+)

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 @@ 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;
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 @@ 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;
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 @@ 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
 };