[PATCH 3/4] irqchip/aspeed: Remove legacy AST2700 interrupt controller driver

[Ryan Chen <ryan_chen@aspeedtech.com>]

The legacy driver was designed around a PSP-centric interrupt model and
cannot describe the full routing and protection capabilities of the
AST2700 interrupt architecture.

This driver is superseded by the new AST2700 INTC0/INTC1 drivers, which
provide a unified, block-level description suitable for all integrated
processors.

There are no known upstream users of the legacy
aspeed,ast2700-intc-ic compatible.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
---
 drivers/irqchip/Makefile          |   1 -
 drivers/irqchip/irq-aspeed-intc.c | 139 --------------------------------------
 2 files changed, 140 deletions(-)

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 51fdf269e436..ed547e90ae89 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -90,7 +90,6 @@ obj-$(CONFIG_LS_EXTIRQ)			+= irq-ls-extirq.o
 obj-$(CONFIG_LS_SCFG_MSI)		+= irq-ls-scfg-msi.o
 obj-$(CONFIG_ASPEED_AST2700_INTC)	+= irq-ast2700.o irq-ast2700-intc0.o irq-ast2700-intc1.o
 obj-$(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
deleted file mode 100644
index 8330221799a0..000000000000
--- a/drivers/irqchip/irq-aspeed-intc.c
+++ /dev/null
@@ -1,139 +0,0 @@
-// 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 irq, i, ret = 0;
-
-	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_create_linear(of_fwnode_handle(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