irqchip/sg2042-msi: Introduce configurable chipinfo for SG2042

As the controller on SG2044 uses different msi_parent_ops and a difffernt
irq_chip, it is necessary to provide that information to the probe function.

Add a new chipinfo structure to hold that information, implement the
necessary logic and make SG2042 use it.

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/20250413224922.69719-4-inochiama@gmail.com

1 files changed, 42 insertions, 11 deletions

diff --git a/drivers/irqchip/irq-sg2042-msi.c b/drivers/irqchip/irq-sg2042-msi.c
index 5f7fae456bd4..325a83c17573 100644
--- a/drivers/irqchip/irq-sg2042-msi.c
+++ b/drivers/irqchip/irq-sg2042-msi.c
@@ -19,18 +19,33 @@
 
 #include "irq-msi-lib.h"
 
-#define SG2042_MAX_MSI_VECTOR	32
+struct sg204x_msi_chip_info {
+	const struct irq_chip		*irqchip;
+	const struct msi_parent_ops	*parent_ops;
+};
 
+/**
+ * struct sg204x_msi_chipdata - chip data for the SG204x MSI IRQ controller
+ * @reg_clr:		clear reg, see TRM, 10.1.33, GP_INTR0_CLR
+ * @doorbell_addr:	see TRM, 10.1.32, GP_INTR0_SET
+ * @irq_first:		First vectors number that MSIs starts
+ * @num_irqs:		Number of vectors for MSIs
+ * @msi_map:		mapping for allocated MSI vectors.
+ * @msi_map_lock:	Lock for msi_map
+ * @chip_info:		chip specific infomations
+ */
 struct sg204x_msi_chipdata {
-	void __iomem	*reg_clr;	// clear reg, see TRM, 10.1.33, GP_INTR0_CLR
+	void __iomem				*reg_clr;
+
+	phys_addr_t				doorbell_addr;
 
-	phys_addr_t	doorbell_addr;	// see TRM, 10.1.32, GP_INTR0_SET
+	u32					irq_first;
+	u32					num_irqs;
 
-	u32		irq_first;	// The vector number that MSIs starts
-	u32		num_irqs;	// The number of vectors for MSIs
+	unsigned long				*msi_map;
+	struct mutex				msi_map_lock;
 
-	DECLARE_BITMAP(msi_map, SG2042_MAX_MSI_VECTOR);
-	struct mutex	msi_map_lock;	// lock for msi_map
+	const struct sg204x_msi_chip_info	*chip_info;
 };
 
 static int sg204x_msi_allocate_hwirq(struct sg204x_msi_chipdata *data, int num_req)
@@ -115,7 +130,7 @@ static int sg204x_msi_middle_domain_alloc(struct irq_domain *domain, unsigned in
 			goto err_hwirq;
 
 		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
-					      &sg2042_msi_middle_irq_chip, data);
+					      data->chip_info->irqchip, data);
 	}
 
 	return 0;
@@ -173,8 +188,7 @@ static int sg204x_msi_init_domains(struct sg204x_msi_chipdata *data,
 	irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);
 
 	middle_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
-	middle_domain->msi_parent_ops = &sg2042_msi_parent_ops;
-
+	middle_domain->msi_parent_ops = data->chip_info->parent_ops;
 	return 0;
 }
 
@@ -191,6 +205,12 @@ static int sg2042_msi_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	data->chip_info = device_get_match_data(&pdev->dev);
+	if (!data->chip_info) {
+		dev_err(&pdev->dev, "Failed to get irqchip\n");
+		return -EINVAL;
+	}
+
 	data->reg_clr = devm_platform_ioremap_resource_byname(pdev, "clr");
 	if (IS_ERR(data->reg_clr)) {
 		dev_err(dev, "Failed to map clear register\n");
@@ -231,11 +251,22 @@ static int sg2042_msi_probe(struct platform_device *pdev)
 
 	mutex_init(&data->msi_map_lock);
 
+	data->msi_map = devm_bitmap_zalloc(&pdev->dev, data->num_irqs, GFP_KERNEL);
+	if (!data->msi_map) {
+		dev_err(&pdev->dev, "Unable to allocate msi mapping\n");
+		return -ENOMEM;
+	}
+
 	return sg204x_msi_init_domains(data, plic_domain, dev);
 }
 
+static const struct sg204x_msi_chip_info sg2042_chip_info = {
+	.irqchip	= &sg2042_msi_middle_irq_chip,
+	.parent_ops	= &sg2042_msi_parent_ops,
+};
+
 static const struct of_device_id sg2042_msi_of_match[] = {
-	{ .compatible	= "sophgo,sg2042-msi" },
+	{ .compatible	= "sophgo,sg2042-msi", .data	= &sg2042_chip_info },
 	{ }
 };