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Message-ID: <20250812100830.145578-3-ryan_chen@aspeedtech.com>
Date: Tue, 12 Aug 2025 18:08:30 +0800
From: Ryan Chen <ryan_chen@...eedtech.com>
To: ryan_chen <ryan_chen@...eedtech.com>, Thomas Gleixner
<tglx@...utronix.de>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Joel Stanley
<joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>, Kevin Chen
<kevin_chen@...eedtech.com>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<linux-aspeed@...ts.ozlabs.org>
Subject: [PATCH v4 2/2] Irqchip/ast2700-intc: add debugfs support and AST2700 INTC0/INTC1 routing/protection display
AST2700 INTC0/INTC1 nodes ("aspeed,ast2700-intc0/1") not only
include the interrupt controller child node ("aspeed,ast2700-intc-ic"),
but also provide interrupt routing and register protection features.
Adds debugfs entries for interrupt routing and protection status for
AST2700 INTC0/INTC1.
Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com>
---
drivers/irqchip/Kconfig | 6 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-ast2700-intc.c | 174 +++++++++++++++++++++++++++++
3 files changed, 181 insertions(+)
create mode 100644 drivers/irqchip/irq-ast2700-intc.c
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index c3928ef79344..9f6473bf4055 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -97,6 +97,12 @@ config AL_FIC
help
Support Amazon's Annapurna Labs Fabric Interrupt Controller.
+config AST2700_INTC
+ tristate "AST2700 Interrupt Controller"
+ depends on ARCH_ASPEED
+ help
+ Support AST2700 Interrupt Controller.
+
config ATMEL_AIC_IRQ
bool
select GENERIC_IRQ_CHIP
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 23ca4959e6ce..eea0a8699204 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -88,6 +88,7 @@ obj-$(CONFIG_LS_EXTIRQ) += irq-ls-extirq.o
obj-$(CONFIG_LS_SCFG_MSI) += irq-ls-scfg-msi.o
obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o irq-aspeed-i2c-ic.o irq-aspeed-scu-ic.o
obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-intc.o
+obj-$(CONFIG_AST2700_INTC) += irq-ast2700-intc.o
obj-$(CONFIG_STM32MP_EXTI) += irq-stm32mp-exti.o
obj-$(CONFIG_STM32_EXTI) += irq-stm32-exti.o
obj-$(CONFIG_QCOM_IRQ_COMBINER) += qcom-irq-combiner.o
diff --git a/drivers/irqchip/irq-ast2700-intc.c b/drivers/irqchip/irq-ast2700-intc.c
new file mode 100644
index 000000000000..7c7241539fe5
--- /dev/null
+++ b/drivers/irqchip/irq-ast2700-intc.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AST2700 Interrupt Controller
+ */
+
+#include <linux/debugfs.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+/* INTC0 register layout */
+#define INTC0_PROT_OFFS 0x40
+#define INTC0_ROUTING_SEL0_BASE 0x200
+#define INTC0_ROUTING_GAP 0x100
+#define INTC0_GROUPS 4
+
+/* INTC1 register layout */
+#define INTC1_PROT_OFFS 0x00
+#define INTC1_ROUTING_SEL0_BASE 0x80
+#define INTC1_ROUTING_GAP 0x20
+#define INTC1_GROUPS 6
+
+struct aspeed_intc_data {
+ const char *name;
+ u32 prot_offs;
+ u32 rout_sel0_base;
+ u32 rout_gap;
+ unsigned int groups;
+};
+
+static const struct aspeed_intc_data aspeed_intc0_data = {
+ .name = "INTC0",
+ .prot_offs = INTC0_PROT_OFFS,
+ .rout_sel0_base = INTC0_ROUTING_SEL0_BASE,
+ .rout_gap = INTC0_ROUTING_GAP,
+ .groups = INTC0_GROUPS,
+};
+
+static const struct aspeed_intc_data aspeed_intc1_data = {
+ .name = "INTC1",
+ .prot_offs = INTC1_PROT_OFFS,
+ .rout_sel0_base = INTC1_ROUTING_SEL0_BASE,
+ .rout_gap = INTC1_ROUTING_GAP,
+ .groups = INTC1_GROUPS,
+};
+
+struct aspeed_intc {
+ void __iomem *base;
+ const struct aspeed_intc_data *data;
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *dbg_root;
+#endif
+};
+
+#ifdef CONFIG_DEBUG_FS
+static int aspeed_intc_regs_show(struct seq_file *s, void *unused)
+{
+ struct aspeed_intc *intc = s->private;
+ const struct aspeed_intc_data *d = intc->data;
+ void __iomem *base = intc->base;
+ unsigned int i;
+
+ for (i = 0; i < d->groups; i++) {
+ void __iomem *b = base + d->rout_sel0_base + i * 4;
+ u32 r0 = readl(b);
+ u32 r1 = readl(b + d->rout_gap);
+ u32 r2 = readl(b + 2 * d->rout_gap);
+
+ seq_printf(s, "ROUTE[%u]: 0x%08x 0x%08x 0x%08x\n", i, r0, r1, r2);
+ }
+ return 0;
+}
+
+static int aspeed_intc_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, aspeed_intc_regs_show, inode->i_private);
+}
+
+static const struct file_operations aspeed_intc_regs_fops = {
+ .owner = THIS_MODULE,
+ .open = aspeed_intc_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int aspeed_intc_prot_show(struct seq_file *s, void *unused)
+{
+ struct aspeed_intc *intc = s->private;
+ const struct aspeed_intc_data *d = intc->data;
+ u32 prot = readl(intc->base + d->prot_offs);
+
+ seq_printf(s, "%s_PROT: 0x%08x\n", d->name, prot);
+ return 0;
+}
+
+static int aspeed_intc_prot_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, aspeed_intc_prot_show, inode->i_private);
+}
+
+static const struct file_operations aspeed_intc_prot_fops = {
+ .owner = THIS_MODULE,
+ .open = aspeed_intc_prot_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif /* CONFIG_DEBUG_FS */
+
+static int aspeed_intc_probe(struct platform_device *pdev)
+{
+ const struct aspeed_intc_data *data;
+ struct aspeed_intc *intc;
+ struct resource *res;
+
+ data = of_device_get_match_data(&pdev->dev);
+ if (!data)
+ return -ENODEV;
+
+ intc = devm_kzalloc(&pdev->dev, sizeof(*intc), GFP_KERNEL);
+ if (!intc)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ intc->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(intc->base))
+ return PTR_ERR(intc->base);
+
+ intc->data = data;
+
+ platform_set_drvdata(pdev, intc);
+
+#ifdef CONFIG_DEBUG_FS
+ intc->dbg_root = debugfs_create_dir(dev_name(&pdev->dev), NULL);
+ if (intc->dbg_root) {
+ debugfs_create_file("routing", 0400, intc->dbg_root, intc,
+ &aspeed_intc_regs_fops);
+ debugfs_create_file("protection", 0400, intc->dbg_root, intc,
+ &aspeed_intc_prot_fops);
+ }
+#endif
+ return 0;
+}
+
+static void aspeed_intc_remove(struct platform_device *pdev)
+{
+#ifdef CONFIG_DEBUG_FS
+ struct aspeed_intc *intc = platform_get_drvdata(pdev);
+
+ if (intc && intc->dbg_root)
+ debugfs_remove_recursive(intc->dbg_root);
+#endif
+}
+
+static const struct of_device_id aspeed_intc_of_match[] = {
+ { .compatible = "aspeed,ast2700-intc0", .data = &aspeed_intc0_data },
+ { .compatible = "aspeed,ast2700-intc1", .data = &aspeed_intc1_data },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, aspeed_intc_of_match);
+
+static struct platform_driver aspeed_intc_driver = {
+ .probe = aspeed_intc_probe,
+ .remove = aspeed_intc_remove,
+ .driver = {
+ .name = "aspeed-ast2700-intc",
+ .of_match_table = aspeed_intc_of_match,
+ },
+};
+module_platform_driver(aspeed_intc_driver);
--
2.34.1
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