1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/xtensa/kernel/irq.c 4 * 5 * Xtensa built-in interrupt controller and some generic functions copied 6 * from i386. 7 * 8 * Copyright (C) 2002 - 2013 Tensilica, Inc. 9 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar 10 * 11 * 12 * Chris Zankel <chris@zankel.net> 13 * Kevin Chea 14 * 15 */ 16 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> 26 #include <linux/of.h> 27 28 #include <asm/mxregs.h> 29 #include <linux/uaccess.h> 30 #include <asm/platform.h> 31 32 DECLARE_PER_CPU(unsigned long, nmi_count); 33 34 asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) 35 { 36 #ifdef CONFIG_DEBUG_STACKOVERFLOW 37 /* Debugging check for stack overflow: is there less than 1KB free? */ 38 { 39 unsigned long sp; 40 41 __asm__ __volatile__ ("mov %0, a1\n" : "=a" (sp)); 42 sp &= THREAD_SIZE - 1; 43 44 if (unlikely(sp < (sizeof(thread_info) + 1024))) 45 printk("Stack overflow in do_IRQ: %ld\n", 46 sp - sizeof(struct thread_info)); 47 } 48 #endif 49 generic_handle_domain_irq(NULL, hwirq); 50 } 51 52 int arch_show_interrupts(struct seq_file *p, int prec) 53 { 54 unsigned cpu __maybe_unused; 55 #ifdef CONFIG_SMP 56 show_ipi_list(p, prec); 57 #endif 58 #if XTENSA_FAKE_NMI 59 seq_printf(p, "%*s:", prec, "NMI"); 60 for_each_online_cpu(cpu) 61 seq_printf(p, " %10lu", per_cpu(nmi_count, cpu)); 62 seq_puts(p, " Non-maskable interrupts\n"); 63 #endif 64 return 0; 65 } 66 67 int xtensa_irq_domain_xlate(const u32 *intspec, unsigned int intsize, 68 unsigned long int_irq, unsigned long ext_irq, 69 unsigned long *out_hwirq, unsigned int *out_type) 70 { 71 if (WARN_ON(intsize < 1 || intsize > 2)) 72 return -EINVAL; 73 if (intsize == 2 && intspec[1] == 1) { 74 int_irq = xtensa_map_ext_irq(ext_irq); 75 if (int_irq < XCHAL_NUM_INTERRUPTS) 76 *out_hwirq = int_irq; 77 else 78 return -EINVAL; 79 } else { 80 *out_hwirq = int_irq; 81 } 82 *out_type = IRQ_TYPE_NONE; 83 return 0; 84 } 85 86 int xtensa_irq_map(struct irq_domain *d, unsigned int irq, 87 irq_hw_number_t hw) 88 { 89 struct irq_chip *irq_chip = d->host_data; 90 u32 mask = 1 << hw; 91 92 if (mask & XCHAL_INTTYPE_MASK_SOFTWARE) { 93 irq_set_chip_and_handler_name(irq, irq_chip, 94 handle_simple_irq, "level"); 95 irq_set_status_flags(irq, IRQ_LEVEL); 96 } else if (mask & XCHAL_INTTYPE_MASK_EXTERN_EDGE) { 97 irq_set_chip_and_handler_name(irq, irq_chip, 98 handle_edge_irq, "edge"); 99 irq_clear_status_flags(irq, IRQ_LEVEL); 100 } else if (mask & XCHAL_INTTYPE_MASK_EXTERN_LEVEL) { 101 irq_set_chip_and_handler_name(irq, irq_chip, 102 handle_level_irq, "level"); 103 irq_set_status_flags(irq, IRQ_LEVEL); 104 } else if (mask & XCHAL_INTTYPE_MASK_TIMER) { 105 irq_set_chip_and_handler_name(irq, irq_chip, 106 handle_percpu_irq, "timer"); 107 irq_clear_status_flags(irq, IRQ_LEVEL); 108 #ifdef XCHAL_INTTYPE_MASK_PROFILING 109 } else if (mask & XCHAL_INTTYPE_MASK_PROFILING) { 110 irq_set_chip_and_handler_name(irq, irq_chip, 111 handle_percpu_irq, "profiling"); 112 irq_set_status_flags(irq, IRQ_LEVEL); 113 #endif 114 } else {/* XCHAL_INTTYPE_MASK_WRITE_ERROR */ 115 /* XCHAL_INTTYPE_MASK_NMI */ 116 irq_set_chip_and_handler_name(irq, irq_chip, 117 handle_level_irq, "level"); 118 irq_set_status_flags(irq, IRQ_LEVEL); 119 } 120 return 0; 121 } 122 123 unsigned xtensa_map_ext_irq(unsigned ext_irq) 124 { 125 unsigned mask = XCHAL_INTTYPE_MASK_EXTERN_EDGE | 126 XCHAL_INTTYPE_MASK_EXTERN_LEVEL; 127 unsigned i; 128 129 for (i = 0; mask; ++i, mask >>= 1) { 130 if ((mask & 1) && ext_irq-- == 0) 131 return i; 132 } 133 return XCHAL_NUM_INTERRUPTS; 134 } 135 136 unsigned xtensa_get_ext_irq_no(unsigned irq) 137 { 138 unsigned mask = (XCHAL_INTTYPE_MASK_EXTERN_EDGE | 139 XCHAL_INTTYPE_MASK_EXTERN_LEVEL) & 140 ((1u << irq) - 1); 141 return hweight32(mask); 142 } 143 144 void __init init_IRQ(void) 145 { 146 #ifdef CONFIG_OF 147 irqchip_init(); 148 #else 149 #ifdef CONFIG_HAVE_SMP 150 xtensa_mx_init_legacy(NULL); 151 #else 152 xtensa_pic_init_legacy(NULL); 153 #endif 154 #endif 155 156 #ifdef CONFIG_SMP 157 ipi_init(); 158 #endif 159 } 160 161 #ifdef CONFIG_HOTPLUG_CPU 162 /* 163 * The CPU has been marked offline. Migrate IRQs off this CPU. If 164 * the affinity settings do not allow other CPUs, force them onto any 165 * available CPU. 166 */ 167 void migrate_irqs(void) 168 { 169 unsigned int i, cpu = smp_processor_id(); 170 171 for_each_active_irq(i) { 172 struct irq_data *data = irq_get_irq_data(i); 173 struct cpumask *mask; 174 unsigned int newcpu; 175 176 if (irqd_is_per_cpu(data)) 177 continue; 178 179 mask = irq_data_get_affinity_mask(data); 180 if (!cpumask_test_cpu(cpu, mask)) 181 continue; 182 183 newcpu = cpumask_any_and(mask, cpu_online_mask); 184 185 if (newcpu >= nr_cpu_ids) { 186 pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n", 187 i, cpu); 188 189 cpumask_setall(mask); 190 } 191 irq_set_affinity(i, mask); 192 } 193 } 194 #endif /* CONFIG_HOTPLUG_CPU */ 195