irqchip/aspeed-intc: Remove AST2700-A0 support

The existing AST2700 interrupt controller driver ("aspeed,ast2700-intc-ic")
was written against the A0 pre-production design.

From A1 onwards (retained in the A2 production silicon), the interrupt
fabric was re-architected: interrupt routing is programmable and interrupt
outputs can be directed to multiple upstream controllers (PSP GIC,
Secondary Service Processor (SSP) NVIC, Tertiary Service Processor (TSP)
NVIC, and Boot MCU interrupt controller). This design requires route
resolution and a controller hierarchy model which the A0 driver cannot
represent.

Remove driver support for A0 in favour of the driver for the A2 production
design.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260407-irqchip-v5-4-c0b0a300a057@aspeedtech.com

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index ac04a4b977976db490869c0130690aa82669600d..3d02441b3ee669a0c046266b73a898eff38058d9 100644 (file)
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -92,7 +92,6 @@ 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-$(CONFIG_ASPEED_AST2700_INTC_TEST) += irq-ast2700-intc0-test.o
 obj-$(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 (file)
index 4fb0dd8..0000000
--- 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_obj(*intc_ic);
-       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);