tick/idle/powerpc: Do not register idle states with CPUIDLE_FLAG_TIMER_STOP set in...
[linux/fpc-iii.git] / arch / xtensa / kernel / irq.c
blob3eee94f621ebd723195d326965cb6afc6998c85f
1 /*
2 * linux/arch/xtensa/kernel/irq.c
4 * Xtensa built-in interrupt controller and some generic functions copied
5 * from i386.
7 * Copyright (C) 2002 - 2013 Tensilica, Inc.
8 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
11 * Chris Zankel <chris@zankel.net>
12 * Kevin Chea
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>
27 #include <asm/mxregs.h>
28 #include <asm/uaccess.h>
29 #include <asm/platform.h>
31 atomic_t irq_err_count;
33 asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
35 int irq = irq_find_mapping(NULL, hwirq);
37 if (hwirq >= NR_IRQS) {
38 printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
39 __func__, hwirq);
42 #ifdef CONFIG_DEBUG_STACKOVERFLOW
43 /* Debugging check for stack overflow: is there less than 1KB free? */
45 unsigned long sp;
47 __asm__ __volatile__ ("mov %0, a1\n" : "=a" (sp));
48 sp &= THREAD_SIZE - 1;
50 if (unlikely(sp < (sizeof(thread_info) + 1024)))
51 printk("Stack overflow in do_IRQ: %ld\n",
52 sp - sizeof(struct thread_info));
54 #endif
55 generic_handle_irq(irq);
58 int arch_show_interrupts(struct seq_file *p, int prec)
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;
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)
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;
83 *out_type = IRQ_TYPE_NONE;
84 return 0;
87 int xtensa_irq_map(struct irq_domain *d, unsigned int irq,
88 irq_hw_number_t hw)
90 struct irq_chip *irq_chip = d->host_data;
91 u32 mask = 1 << hw;
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);
115 return 0;
118 unsigned xtensa_map_ext_irq(unsigned ext_irq)
120 unsigned mask = XCHAL_INTTYPE_MASK_EXTERN_EDGE |
121 XCHAL_INTTYPE_MASK_EXTERN_LEVEL;
122 unsigned i;
124 for (i = 0; mask; ++i, mask >>= 1) {
125 if ((mask & 1) && ext_irq-- == 0)
126 return i;
128 return XCHAL_NUM_INTERRUPTS;
131 unsigned xtensa_get_ext_irq_no(unsigned irq)
133 unsigned mask = (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
134 XCHAL_INTTYPE_MASK_EXTERN_LEVEL) &
135 ((1u << irq) - 1);
136 return hweight32(mask);
139 void __init init_IRQ(void)
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
151 #ifdef CONFIG_SMP
152 ipi_init();
153 #endif
154 variant_init_irq();
157 #ifdef CONFIG_HOTPLUG_CPU
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.
163 void migrate_irqs(void)
165 unsigned int i, cpu = smp_processor_id();
167 for_each_active_irq(i) {
168 struct irq_data *data = irq_get_irq_data(i);
169 unsigned int newcpu;
171 if (irqd_is_per_cpu(data))
172 continue;
174 if (!cpumask_test_cpu(cpu, data->affinity))
175 continue;
177 newcpu = cpumask_any_and(data->affinity, cpu_online_mask);
179 if (newcpu >= nr_cpu_ids) {
180 pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n",
181 i, cpu);
183 cpumask_setall(data->affinity);
185 irq_set_affinity(i, data->affinity);
188 #endif /* CONFIG_HOTPLUG_CPU */