1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/xtensa/kernel/irq.c
5 * Xtensa built-in interrupt controller and some generic functions copied
8 * Copyright (C) 2002 - 2013 Tensilica, Inc.
9 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
12 * Chris Zankel <chris@zankel.net>
17 #include <linux/module.h>
18 #include <linux/seq_file.h>
19 #include <linux/interrupt.h>
20 #include <linux/irq.h>
21 #include <linux/kernel_stat.h>
22 #include <linux/irqchip.h>
23 #include <linux/irqchip/xtensa-mx.h>
24 #include <linux/irqchip/xtensa-pic.h>
25 #include <linux/irqdomain.h>
28 #include <asm/mxregs.h>
29 #include <linux/uaccess.h>
30 #include <asm/platform.h>
32 DECLARE_PER_CPU(unsigned long, nmi_count);
34 asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
36 #ifdef CONFIG_DEBUG_STACKOVERFLOW
37 /* Debugging check for stack overflow: is there less than 1KB free? */
39 unsigned long sp = current_stack_pointer;
41 sp &= THREAD_SIZE - 1;
43 if (unlikely(sp < (sizeof(thread_info) + 1024)))
44 printk("Stack overflow in do_IRQ: %ld\n",
45 sp - sizeof(struct thread_info));
48 generic_handle_domain_irq(NULL, hwirq);
51 int arch_show_interrupts(struct seq_file *p, int prec)
53 unsigned cpu __maybe_unused;
55 show_ipi_list(p, prec);
58 seq_printf(p, "%*s:", prec, "NMI");
59 for_each_online_cpu(cpu)
60 seq_printf(p, " %10lu", per_cpu(nmi_count, cpu));
61 seq_puts(p, " Non-maskable interrupts\n");
66 int xtensa_irq_domain_xlate(const u32 *intspec, unsigned int intsize,
67 unsigned long int_irq, unsigned long ext_irq,
68 unsigned long *out_hwirq, unsigned int *out_type)
70 if (WARN_ON(intsize < 1 || intsize > 2))
72 if (intsize == 2 && intspec[1] == 1) {
73 int_irq = xtensa_map_ext_irq(ext_irq);
74 if (int_irq < XCHAL_NUM_INTERRUPTS)
81 *out_type = IRQ_TYPE_NONE;
85 int xtensa_irq_map(struct irq_domain *d, unsigned int irq,
88 struct irq_chip *irq_chip = d->host_data;
91 if (mask & XCHAL_INTTYPE_MASK_SOFTWARE) {
92 irq_set_chip_and_handler_name(irq, irq_chip,
93 handle_simple_irq, "level");
94 irq_set_status_flags(irq, IRQ_LEVEL);
95 } else if (mask & XCHAL_INTTYPE_MASK_EXTERN_EDGE) {
96 irq_set_chip_and_handler_name(irq, irq_chip,
97 handle_edge_irq, "edge");
98 irq_clear_status_flags(irq, IRQ_LEVEL);
99 } else if (mask & XCHAL_INTTYPE_MASK_EXTERN_LEVEL) {
100 irq_set_chip_and_handler_name(irq, irq_chip,
101 handle_level_irq, "level");
102 irq_set_status_flags(irq, IRQ_LEVEL);
103 } else if (mask & XCHAL_INTTYPE_MASK_TIMER) {
104 irq_set_chip_and_handler_name(irq, irq_chip,
105 handle_percpu_irq, "timer");
106 irq_clear_status_flags(irq, IRQ_LEVEL);
107 #ifdef XCHAL_INTTYPE_MASK_PROFILING
108 } else if (mask & XCHAL_INTTYPE_MASK_PROFILING) {
109 irq_set_chip_and_handler_name(irq, irq_chip,
110 handle_percpu_irq, "profiling");
111 irq_set_status_flags(irq, IRQ_LEVEL);
113 } else {/* XCHAL_INTTYPE_MASK_WRITE_ERROR */
114 /* XCHAL_INTTYPE_MASK_NMI */
115 irq_set_chip_and_handler_name(irq, irq_chip,
116 handle_level_irq, "level");
117 irq_set_status_flags(irq, IRQ_LEVEL);
122 unsigned xtensa_map_ext_irq(unsigned ext_irq)
124 unsigned mask = XCHAL_INTTYPE_MASK_EXTERN_EDGE |
125 XCHAL_INTTYPE_MASK_EXTERN_LEVEL;
128 for (i = 0; mask; ++i, mask >>= 1) {
129 if ((mask & 1) && ext_irq-- == 0)
132 return XCHAL_NUM_INTERRUPTS;
135 unsigned xtensa_get_ext_irq_no(unsigned irq)
137 unsigned mask = (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
138 XCHAL_INTTYPE_MASK_EXTERN_LEVEL) &
140 return hweight32(mask);
143 void __init init_IRQ(void)
148 #ifdef CONFIG_HAVE_SMP
149 xtensa_mx_init_legacy(NULL);
151 xtensa_pic_init_legacy(NULL);
160 #ifdef CONFIG_HOTPLUG_CPU
162 * The CPU has been marked offline. Migrate IRQs off this CPU. If
163 * the affinity settings do not allow other CPUs, force them onto any
166 void migrate_irqs(void)
168 unsigned int i, cpu = smp_processor_id();
170 for_each_active_irq(i) {
171 struct irq_data *data = irq_get_irq_data(i);
172 const struct cpumask *mask;
175 if (irqd_is_per_cpu(data))
178 mask = irq_data_get_affinity_mask(data);
179 if (!cpumask_test_cpu(cpu, mask))
182 newcpu = cpumask_any_and(mask, cpu_online_mask);
184 if (newcpu >= nr_cpu_ids) {
185 pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n",
188 irq_set_affinity(i, cpu_all_mask);
190 irq_set_affinity(i, mask);
194 #endif /* CONFIG_HOTPLUG_CPU */