2019-06-04 16:11:33 +08:00
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// SPDX-License-Identifier: GPL-2.0-only
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2013-06-26 15:18:48 +08:00
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/*
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* drivers/irq/irq-nvic.c
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*
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* Copyright (C) 2008 ARM Limited, All Rights Reserved.
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* Copyright (C) 2013 Pengutronix
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*
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* Support for the Nested Vectored Interrupt Controller found on the
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* ARMv7-M CPUs (Cortex-M3/M4)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/irq.h>
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2015-07-08 05:11:46 +08:00
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#include <linux/irqchip.h>
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2013-06-26 15:18:48 +08:00
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#include <linux/irqdomain.h>
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#include <asm/v7m.h>
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#include <asm/exception.h>
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#define NVIC_ISER 0x000
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#define NVIC_ICER 0x080
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#define NVIC_IPR 0x300
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#define NVIC_MAX_BANKS 16
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/*
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* Each bank handles 32 irqs. Only the 16th (= last) bank handles only
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* 16 irqs.
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*/
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#define NVIC_MAX_IRQ ((NVIC_MAX_BANKS - 1) * 32 + 16)
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static struct irq_domain *nvic_irq_domain;
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irq: arm: perform irqentry in entry code
In preparation for removing HANDLE_DOMAIN_IRQ_IRQENTRY, have arch/arm
perform all the irqentry accounting in its entry code.
For configurations with CONFIG_GENERIC_IRQ_MULTI_HANDLER, we can use
generic_handle_arch_irq(). Other than asm_do_IRQ(), all C calls to
handle_IRQ() are from irqchip handlers which will be called from
generic_handle_arch_irq(), so to avoid double accounting IRQ entry, the
entry logic is moved from handle_IRQ() into asm_do_IRQ().
For ARMv7M the entry assembly is tightly coupled with the NVIC irqchip, and
while the entry code should logically live under arch/arm/, moving the
entry logic there makes things more convoluted. So for now, place the
entry logic in the NVIC irqchip, but separated into a separate
function to make the split of responsibility clear.
For all other configurations without CONFIG_GENERIC_IRQ_MULTI_HANDLER,
IRQ entry is already handled in arch code, and requires no changes.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
2021-10-20 01:17:17 +08:00
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static void __nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
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{
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handle_domain_irq(nvic_irq_domain, hwirq, regs);
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}
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/*
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* TODO: restructure the ARMv7M entry logic so that this entry logic can live
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* in arch code.
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*/
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2013-06-26 15:18:48 +08:00
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asmlinkage void __exception_irq_entry
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nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
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{
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irq: arm: perform irqentry in entry code
In preparation for removing HANDLE_DOMAIN_IRQ_IRQENTRY, have arch/arm
perform all the irqentry accounting in its entry code.
For configurations with CONFIG_GENERIC_IRQ_MULTI_HANDLER, we can use
generic_handle_arch_irq(). Other than asm_do_IRQ(), all C calls to
handle_IRQ() are from irqchip handlers which will be called from
generic_handle_arch_irq(), so to avoid double accounting IRQ entry, the
entry logic is moved from handle_IRQ() into asm_do_IRQ().
For ARMv7M the entry assembly is tightly coupled with the NVIC irqchip, and
while the entry code should logically live under arch/arm/, moving the
entry logic there makes things more convoluted. So for now, place the
entry logic in the NVIC irqchip, but separated into a separate
function to make the split of responsibility clear.
For all other configurations without CONFIG_GENERIC_IRQ_MULTI_HANDLER,
IRQ entry is already handled in arch code, and requires no changes.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
2021-10-20 01:17:17 +08:00
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struct pt_regs *old_regs;
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irq_enter();
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old_regs = set_irq_regs(regs);
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__nvic_handle_irq(hwirq, regs);
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set_irq_regs(old_regs);
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irq_exit();
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2013-06-26 15:18:48 +08:00
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}
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2015-05-16 17:44:16 +08:00
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static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *arg)
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{
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int i, ret;
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irq_hw_number_t hwirq;
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unsigned int type = IRQ_TYPE_NONE;
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2015-10-13 19:51:33 +08:00
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struct irq_fwspec *fwspec = arg;
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2015-05-16 17:44:16 +08:00
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2019-12-10 19:11:10 +08:00
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ret = irq_domain_translate_onecell(domain, fwspec, &hwirq, &type);
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2015-05-16 17:44:16 +08:00
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if (ret)
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return ret;
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for (i = 0; i < nr_irqs; i++)
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irq_map_generic_chip(domain, virq + i, hwirq + i);
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return 0;
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}
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static const struct irq_domain_ops nvic_irq_domain_ops = {
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2019-12-10 19:11:10 +08:00
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.translate = irq_domain_translate_onecell,
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2015-05-16 17:44:16 +08:00
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.alloc = nvic_irq_domain_alloc,
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.free = irq_domain_free_irqs_top,
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};
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2013-06-26 15:18:48 +08:00
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static int __init nvic_of_init(struct device_node *node,
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struct device_node *parent)
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{
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unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
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unsigned int irqs, i, ret, numbanks;
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void __iomem *nvic_base;
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numbanks = (readl_relaxed(V7M_SCS_ICTR) &
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V7M_SCS_ICTR_INTLINESNUM_MASK) + 1;
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nvic_base = of_iomap(node, 0);
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if (!nvic_base) {
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pr_warn("unable to map nvic registers\n");
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return -ENOMEM;
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}
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irqs = numbanks * 32;
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if (irqs > NVIC_MAX_IRQ)
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irqs = NVIC_MAX_IRQ;
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nvic_irq_domain =
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2015-05-16 17:44:16 +08:00
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irq_domain_add_linear(node, irqs, &nvic_irq_domain_ops, NULL);
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2013-06-26 15:18:48 +08:00
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if (!nvic_irq_domain) {
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pr_warn("Failed to allocate irq domain\n");
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return -ENOMEM;
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}
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2013-07-05 15:39:11 +08:00
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ret = irq_alloc_domain_generic_chips(nvic_irq_domain, 32, 1,
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2013-06-26 15:18:48 +08:00
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"nvic_irq", handle_fasteoi_irq,
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clr, 0, IRQ_GC_INIT_MASK_CACHE);
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if (ret) {
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pr_warn("Failed to allocate irq chips\n");
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irq_domain_remove(nvic_irq_domain);
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return ret;
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}
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for (i = 0; i < numbanks; ++i) {
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struct irq_chip_generic *gc;
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gc = irq_get_domain_generic_chip(nvic_irq_domain, 32 * i);
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gc->reg_base = nvic_base + 4 * i;
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gc->chip_types[0].regs.enable = NVIC_ISER;
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gc->chip_types[0].regs.disable = NVIC_ICER;
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gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
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gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
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2014-06-04 23:01:52 +08:00
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/* This is a no-op as end of interrupt is signaled by the
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* exception return sequence.
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*/
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gc->chip_types[0].chip.irq_eoi = irq_gc_noop;
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2013-06-26 15:18:48 +08:00
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/* disable interrupts */
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writel_relaxed(~0, gc->reg_base + NVIC_ICER);
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}
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/* Set priority on all interrupts */
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for (i = 0; i < irqs; i += 4)
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writel_relaxed(0, nvic_base + NVIC_IPR + i);
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return 0;
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}
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IRQCHIP_DECLARE(armv7m_nvic, "arm,armv7m-nvic", nvic_of_init);
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