~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/xtensa/kernel/irq.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.12 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.55 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.136 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.191 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp