Support Aspeed Interrupt Controller on Aspeed Silicon SoCs.
ASPEED interrupt controller(INTC) maps the internal interrupt
sources to a parent interrupt controller, which can be GIC or INTC.
Signed-off-by: Kevin Chen <kevin_chen@xxxxxxxxxxxxxx>
---
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-aspeed-intc.c | 140 ++++++++++++++++++++++++++++++
2 files changed, 141 insertions(+)
create mode 100644 drivers/irqchip/irq-aspeed-intc.c
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index e3679ec2b9f7..086911bf4db6 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_MVEBU_SEI) += irq-mvebu-sei.o
obj-$(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_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-aspeed-intc.c b/drivers/irqchip/irq-aspeed-intc.c
new file mode 100644
index 000000000000..faf18a675395
--- /dev/null
+++ b/drivers/irqchip/irq-aspeed-intc.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Aspeed Interrupt Controller.
+ *
+ * Copyright (C) 2023 ASPEED Technology Inc.
+ */
+
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+#define INTC_INT_ENABLE_REG 0x00
+#define INTC_INT_STATUS_REG 0x04
+#define INTC_IRQS_PER_WORD 32
+
+struct aspeed_intc_ic {
+ void __iomem *base;
+ raw_spinlock_t gic_lock;
+ raw_spinlock_t intc_lock;
+ struct irq_domain *irq_domain;
+};
+
+static void aspeed_intc_ic_irq_handler(struct irq_desc *desc)
+{
+ struct aspeed_intc_ic *intc_ic = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+
+ chained_irq_enter(chip, desc);
+
+ scoped_guard(raw_spinlock, &intc_ic->gic_lock) {
+ unsigned long bit, status;
+
+ status = readl(intc_ic->base + INTC_INT_STATUS_REG);
+ for_each_set_bit(bit, &status, INTC_IRQS_PER_WORD) {
+ generic_handle_domain_irq(intc_ic->irq_domain, bit);
+ writel(BIT(bit), intc_ic->base + INTC_INT_STATUS_REG);
+ }
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void aspeed_intc_irq_mask(struct irq_data *data)
+{
+ struct aspeed_intc_ic *intc_ic = irq_data_get_irq_chip_data(data);
+ unsigned int mask = readl(intc_ic->base + INTC_INT_ENABLE_REG) & ~BIT(data->hwirq);
+
+ guard(raw_spinlock)(&intc_ic->intc_lock);
+ writel(mask, intc_ic->base + INTC_INT_ENABLE_REG);
+}
+
+static void aspeed_intc_irq_unmask(struct irq_data *data)
+{
+ struct aspeed_intc_ic *intc_ic = irq_data_get_irq_chip_data(data);
+ unsigned int unmask = readl(intc_ic->base + INTC_INT_ENABLE_REG) | BIT(data->hwirq);
+
+ guard(raw_spinlock)(&intc_ic->intc_lock);
+ writel(unmask, intc_ic->base + INTC_INT_ENABLE_REG);
+}
+
+static struct irq_chip aspeed_intc_chip = {
+ .name = "ASPEED INTC",
+ .irq_mask = aspeed_intc_irq_mask,
+ .irq_unmask = aspeed_intc_irq_unmask,
+};
+
+static int aspeed_intc_ic_map_irq_domain(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &aspeed_intc_chip, handle_level_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops aspeed_intc_ic_irq_domain_ops = {
+ .map = aspeed_intc_ic_map_irq_domain,
+};
+
+static int __init aspeed_intc_ic_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ struct aspeed_intc_ic *intc_ic;
+ int ret = 0;
+ int irq, i;
+
+ intc_ic = kzalloc(sizeof(*intc_ic), GFP_KERNEL);
+ if (!intc_ic)
+ return -ENOMEM;
+
+ intc_ic->base = of_iomap(node, 0);
+ if (!intc_ic->base) {
+ pr_err("Failed to iomap intc_ic base\n");
+ ret = -ENOMEM;
+ goto err_free_ic;
+ }
+ writel(0xffffffff, intc_ic->base + INTC_INT_STATUS_REG);
+ writel(0x0, intc_ic->base + INTC_INT_ENABLE_REG);
+
+ intc_ic->irq_domain = irq_domain_add_linear(node, INTC_IRQS_PER_WORD,
+ &aspeed_intc_ic_irq_domain_ops, intc_ic);
+ if (!intc_ic->irq_domain) {
+ ret = -ENOMEM;
+ goto err_iounmap;
+ }
+
+ raw_spin_lock_init(&intc_ic->gic_lock);
+ raw_spin_lock_init(&intc_ic->intc_lock);
+
+ /* Check all the irq numbers valid. If not, unmaps all the base and frees the data. */
+ for (i = 0; i < of_irq_count(node); i++) {
+ irq = irq_of_parse_and_map(node, i);
+ if (!irq) {
+ pr_err("Failed to get irq number\n");
+ ret = -EINVAL;
+ goto err_iounmap;
+ }
+ }
+
+ for (i = 0; i < of_irq_count(node); i++) {
+ irq = irq_of_parse_and_map(node, i);
+ irq_set_chained_handler_and_data(irq, aspeed_intc_ic_irq_handler, intc_ic);
+ }
+
+ return 0;
+
+err_iounmap:
+ iounmap(intc_ic->base);
+err_free_ic:
+ kfree(intc_ic);
+ return ret;
+}
+
+IRQCHIP_DECLARE(ast2700_intc_ic, "aspeed,ast2700-intc-ic", aspeed_intc_ic_of_init);
--
2.34.1
