The Realtek RTL8186 SoC is a MIPS based SoC used in some home routers [1][2].
This adds a driver to handle the interrupt controller on this SoC. [1] https://www.linux-mips.org/wiki/Realtek_SOC#Realtek_RTL8186 [2] https://wikidevi.com/wiki/Realtek_RTL8186 Signed-off-by: Yasha Cherikovsky <yasha.c...@gmail.com> Cc: Ralf Baechle <r...@linux-mips.org> Cc: Paul Burton <paul.bur...@mips.com> Cc: James Hogan <jho...@kernel.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Jason Cooper <ja...@lakedaemon.net> Cc: Marc Zyngier <marc.zyng...@arm.com> Cc: Rob Herring <robh...@kernel.org> Cc: Mark Rutland <mark.rutl...@arm.com> Cc: linux-m...@linux-mips.org Cc: devicet...@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- drivers/irqchip/Kconfig | 5 ++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-rtl8186.c | 107 ++++++++++++++++++++++++++++++++++ 3 files changed, 113 insertions(+) create mode 100644 drivers/irqchip/irq-rtl8186.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index e9233db16e03..83099905a871 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -371,4 +371,9 @@ config QCOM_PDC Power Domain Controller driver to manage and configure wakeup IRQs for Qualcomm Technologies Inc (QTI) mobile chips. +config RTL8186_IRQ + bool + depends on MACH_RTL8186 + select IRQ_DOMAIN + endmenu diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 15f268f646bf..2e0bb859a8f4 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -87,3 +87,4 @@ obj-$(CONFIG_MESON_IRQ_GPIO) += irq-meson-gpio.o obj-$(CONFIG_GOLDFISH_PIC) += irq-goldfish-pic.o obj-$(CONFIG_NDS32) += irq-ativic32.o obj-$(CONFIG_QCOM_PDC) += qcom-pdc.o +obj-$(CONFIG_RTL8186_IRQ) += irq-rtl8186.o diff --git a/drivers/irqchip/irq-rtl8186.c b/drivers/irqchip/irq-rtl8186.c new file mode 100644 index 000000000000..3eb6b947d5a0 --- /dev/null +++ b/drivers/irqchip/irq-rtl8186.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Realtek RTL8186 SoC interrupt controller driver. + * + * Copyright (C) 2018 Yasha Cherikovsky + */ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqdomain.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#define RTL8186_NR_IRQS 11 + +#define GIMR 0x00 +#define GISR 0x04 + +static struct { + void __iomem *base; + struct irq_domain *domain; +} intc; + + +asmlinkage void plat_irq_dispatch(void) +{ + u32 hwirq, virq; + u32 gimr = readl(intc.base + GIMR); + u32 gisr = readl(intc.base + GISR); + u32 pending = gimr & gisr & ((1 << RTL8186_NR_IRQS) - 1); + + if (!pending) { + spurious_interrupt(); + return; + } + + while (pending) { + hwirq = fls(pending) - 1; + virq = irq_linear_revmap(intc.domain, hwirq); + do_IRQ(virq); + pending &= ~BIT(hwirq); + } +} + +static void rtl8186_irq_mask(struct irq_data *data) +{ + unsigned long irq = data->hwirq; + + writel(readl(intc.base + GIMR) & (~(BIT(irq))), intc.base + GIMR); +} + +static void rtl8186_irq_unmask(struct irq_data *data) +{ + unsigned long irq = data->hwirq; + + writel((readl(intc.base + GIMR) | (BIT(irq))), intc.base + GIMR); +} + +static struct irq_chip rtl8186_irq_chip = { + .name = "RTL8186", + .irq_mask = rtl8186_irq_mask, + .irq_unmask = rtl8186_irq_unmask, +}; + +static int rtl8186_intc_irq_domain_map(struct irq_domain *d, unsigned int virq, + irq_hw_number_t hw) +{ + irq_set_chip_and_handler(virq, &rtl8186_irq_chip, handle_level_irq); + return 0; +} + +static const struct irq_domain_ops rtl8186_irq_ops = { + .map = rtl8186_intc_irq_domain_map, + .xlate = irq_domain_xlate_onecell, +}; + +static int __init rtl8186_intc_of_init(struct device_node *node, + struct device_node *parent) +{ + intc.base = of_io_request_and_map(node, 0, of_node_full_name(node)); + + if (IS_ERR(intc.base)) + panic("%pOF: unable to map resource", node); + + intc.domain = irq_domain_add_linear(node, RTL8186_NR_IRQS, + &rtl8186_irq_ops, NULL); + + if (!intc.domain) + panic("%pOF: unable to create IRQ domain\n", node); + + /* Start with all interrupts disabled */ + writel(0, intc.base + GIMR); + + /* + * Enable all hardware interrupts in CP0 status register. + * Software interrupts are disabled. + */ + set_c0_status(ST0_IM); + clear_c0_status(STATUSF_IP0 | STATUSF_IP1); + clear_c0_cause(CAUSEF_IP); + + return 0; +} + +IRQCHIP_DECLARE(rtl8186_intc, "realtek,rtl8186-intc", rtl8186_intc_of_init); -- 2.19.0
