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 int irq = irq_find_mapping(NULL, hwirq); 37 38 #ifdef CONFIG_DEBUG_STACKOVERFLOW 39 /* Debugging check for stack overflow: is there less than 1KB free? */ 40 { 41 unsigned long sp; 42 43 __asm__ __volatile__ ("mov %0, a1\n" : "=a" (sp)); 44 sp &= THREAD_SIZE - 1; 45 46 if (unlikely(sp < (sizeof(thread_info) + 1024))) 47 printk("Stack overflow in do_IRQ: %ld\n", 48 sp - sizeof(struct thread_info)); 49 } 50 #endif 51 generic_handle_irq(irq); 52 } 53 54 int arch_show_interrupts(struct seq_file *p, int prec) 55 { 56 unsigned cpu __maybe_unused; 57 #ifdef CONFIG_SMP 58 show_ipi_list(p, prec); 59 #endif 60 #if XTENSA_FAKE_NMI 61 seq_printf(p, "%*s:", prec, "NMI"); 62 for_each_online_cpu(cpu) 63 seq_printf(p, " %10lu", per_cpu(nmi_count, cpu)); 64 seq_puts(p, " Non-maskable interrupts\n"); 65 #endif 66 return 0; 67 } 68 69 int xtensa_irq_domain_xlate(const u32 *intspec, unsigned int intsize, 70 unsigned long int_irq, unsigned long ext_irq, 71 unsigned long *out_hwirq, unsigned int *out_type) 72 { 73 if (WARN_ON(intsize < 1 || intsize > 2)) 74 return -EINVAL; 75 if (intsize == 2 && intspec[1] == 1) { 76 int_irq = xtensa_map_ext_irq(ext_irq); 77 if (int_irq < XCHAL_NUM_INTERRUPTS) 78 *out_hwirq = int_irq; 79 else 80 return -EINVAL; 81 } else { 82 *out_hwirq = int_irq; 83 } 84 *out_type = IRQ_TYPE_NONE; 85 return 0; 86 } 87 88 int xtensa_irq_map(struct irq_domain *d, unsigned int irq, 89 irq_hw_number_t hw) 90 { 91 struct irq_chip *irq_chip = d->host_data; 92 u32 mask = 1 << hw; 93 94 if (mask & XCHAL_INTTYPE_MASK_SOFTWARE) { 95 irq_set_chip_and_handler_name(irq, irq_chip, 96 handle_simple_irq, "level"); 97 irq_set_status_flags(irq, IRQ_LEVEL); 98 } else if (mask & XCHAL_INTTYPE_MASK_EXTERN_EDGE) { 99 irq_set_chip_and_handler_name(irq, irq_chip, 100 handle_edge_irq, "edge"); 101 irq_clear_status_flags(irq, IRQ_LEVEL); 102 } else if (mask & XCHAL_INTTYPE_MASK_EXTERN_LEVEL) { 103 irq_set_chip_and_handler_name(irq, irq_chip, 104 handle_level_irq, "level"); 105 irq_set_status_flags(irq, IRQ_LEVEL); 106 } else if (mask & XCHAL_INTTYPE_MASK_TIMER) { 107 irq_set_chip_and_handler_name(irq, irq_chip, 108 handle_percpu_irq, "timer"); 109 irq_clear_status_flags(irq, IRQ_LEVEL); 110 #ifdef XCHAL_INTTYPE_MASK_PROFILING 111 } else if (mask & XCHAL_INTTYPE_MASK_PROFILING) { 112 irq_set_chip_and_handler_name(irq, irq_chip, 113 handle_percpu_irq, "profiling"); 114 irq_set_status_flags(irq, IRQ_LEVEL); 115 #endif 116 } else {/* XCHAL_INTTYPE_MASK_WRITE_ERROR */ 117 /* XCHAL_INTTYPE_MASK_NMI */ 118 irq_set_chip_and_handler_name(irq, irq_chip, 119 handle_level_irq, "level"); 120 irq_set_status_flags(irq, IRQ_LEVEL); 121 } 122 return 0; 123 } 124 125 unsigned xtensa_map_ext_irq(unsigned ext_irq) 126 { 127 unsigned mask = XCHAL_INTTYPE_MASK_EXTERN_EDGE | 128 XCHAL_INTTYPE_MASK_EXTERN_LEVEL; 129 unsigned i; 130 131 for (i = 0; mask; ++i, mask >>= 1) { 132 if ((mask & 1) && ext_irq-- == 0) 133 return i; 134 } 135 return XCHAL_NUM_INTERRUPTS; 136 } 137 138 unsigned xtensa_get_ext_irq_no(unsigned irq) 139 { 140 unsigned mask = (XCHAL_INTTYPE_MASK_EXTERN_EDGE | 141 XCHAL_INTTYPE_MASK_EXTERN_LEVEL) & 142 ((1u << irq) - 1); 143 return hweight32(mask); 144 } 145 146 void __init init_IRQ(void) 147 { 148 #ifdef CONFIG_OF 149 irqchip_init(); 150 #else 151 #ifdef CONFIG_HAVE_SMP 152 xtensa_mx_init_legacy(NULL); 153 #else 154 xtensa_pic_init_legacy(NULL); 155 #endif 156 #endif 157 158 #ifdef CONFIG_SMP 159 ipi_init(); 160 #endif 161 } 162 163 #ifdef CONFIG_HOTPLUG_CPU 164 /* 165 * The CPU has been marked offline. Migrate IRQs off this CPU. If 166 * the affinity settings do not allow other CPUs, force them onto any 167 * available CPU. 168 */ 169 void migrate_irqs(void) 170 { 171 unsigned int i, cpu = smp_processor_id(); 172 173 for_each_active_irq(i) { 174 struct irq_data *data = irq_get_irq_data(i); 175 struct cpumask *mask; 176 unsigned int newcpu; 177 178 if (irqd_is_per_cpu(data)) 179 continue; 180 181 mask = irq_data_get_affinity_mask(data); 182 if (!cpumask_test_cpu(cpu, mask)) 183 continue; 184 185 newcpu = cpumask_any_and(mask, cpu_online_mask); 186 187 if (newcpu >= nr_cpu_ids) { 188 pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n", 189 i, cpu); 190 191 cpumask_setall(mask); 192 } 193 irq_set_affinity(i, mask); 194 } 195 } 196 #endif /* CONFIG_HOTPLUG_CPU */ 197