irqchip/sg2042-msi: Add the Sophgo SG2044 MSI interrupt controller

Add support for Sophgo SG2044 MSI interrupt controller.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Chen Wang <wangchen20@iscas.ac.cn> # SG2042
Reviewed-by: Chen Wang <unicorn_wang@outlook.com>
Link: https://lore.kernel.org/all/20250413224922.69719-5-inochiama@gmail.com

Author: inochisa

drivers/irqchip/irq-sg2042-msi.c

@@ -94,6 +94,35 @@ static const struct irq_chip sg2042_msi_middle_irq_chip = {
 	.irq_compose_msi_msg	= sg2042_msi_irq_compose_msi_msg,
 };
 
+static void sg2044_msi_irq_ack(struct irq_data *d)
+{
+	struct sg204x_msi_chipdata *data = irq_data_get_irq_chip_data(d);
+
+	writel(0, (u32 *)data->reg_clr + d->hwirq);
+	irq_chip_ack_parent(d);
+}
+
+static void sg2044_msi_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
+{
+	struct sg204x_msi_chipdata *data = irq_data_get_irq_chip_data(d);
+	phys_addr_t doorbell = data->doorbell_addr + 4 * (d->hwirq / 32);
+
+	msg->address_lo = lower_32_bits(doorbell);
+	msg->address_hi = upper_32_bits(doorbell);
+	msg->data = d->hwirq % 32;
+}
+
+static struct irq_chip sg2044_msi_middle_irq_chip = {
+	.name			= "SG2044 MSI",
+	.irq_ack		= sg2044_msi_irq_ack,
+	.irq_mask		= irq_chip_mask_parent,
+	.irq_unmask		= irq_chip_unmask_parent,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= irq_chip_set_affinity_parent,
+#endif
+	.irq_compose_msi_msg	= sg2044_msi_irq_compose_msi_msg,
+};
+
 static int sg204x_msi_parent_domain_alloc(struct irq_domain *domain, unsigned int virq, int hwirq)
 {
 	struct sg204x_msi_chipdata *data = domain->host_data;
@@ -132,13 +161,11 @@ static int sg204x_msi_middle_domain_alloc(struct irq_domain *domain, unsigned in
 		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 					      data->chip_info->irqchip, data);
 	}
-
 	return 0;
 
 err_hwirq:
 	sg204x_msi_free_hwirq(data, hwirq, nr_irqs);
 	irq_domain_free_irqs_parent(domain, virq, i);
-
 	return err;
 }
 
@@ -172,6 +199,22 @@ static const struct msi_parent_ops sg2042_msi_parent_ops = {
 	.init_dev_msi_info	= msi_lib_init_dev_msi_info,
 };
 
+#define SG2044_MSI_FLAGS_REQUIRED (MSI_FLAG_USE_DEF_DOM_OPS |	\
+				   MSI_FLAG_USE_DEF_CHIP_OPS)
+
+#define SG2044_MSI_FLAGS_SUPPORTED (MSI_GENERIC_FLAGS_MASK |	\
+				    MSI_FLAG_PCI_MSIX)
+
+static const struct msi_parent_ops sg2044_msi_parent_ops = {
+	.required_flags		= SG2044_MSI_FLAGS_REQUIRED,
+	.supported_flags	= SG2044_MSI_FLAGS_SUPPORTED,
+	.chip_flags		= MSI_CHIP_FLAG_SET_EOI | MSI_CHIP_FLAG_SET_ACK,
+	.bus_select_mask	= MATCH_PCI_MSI,
+	.bus_select_token	= DOMAIN_BUS_NEXUS,
+	.prefix			= "SG2044-",
+	.init_dev_msi_info	= msi_lib_init_dev_msi_info,
+};
+
 static int sg204x_msi_init_domains(struct sg204x_msi_chipdata *data,
 				   struct irq_domain *plic_domain, struct device *dev)
 {
@@ -265,8 +308,14 @@ static const struct sg204x_msi_chip_info sg2042_chip_info = {
 	.parent_ops	= &sg2042_msi_parent_ops,
 };
 
+static const struct sg204x_msi_chip_info sg2044_chip_info = {
+	.irqchip	= &sg2044_msi_middle_irq_chip,
+	.parent_ops	= &sg2044_msi_parent_ops,
+};
+
 static const struct of_device_id sg2042_msi_of_match[] = {
 	{ .compatible	= "sophgo,sg2042-msi", .data	= &sg2042_chip_info },
+	{ .compatible	= "sophgo,sg2044-msi", .data	= &sg2044_chip_info },
 	{ }
 };