2 * linux/arch/xtensa/kernel/irq.c
4 * Xtensa built-in interrupt controller and some generic functions copied
7 * Copyright (C) 2002 - 2013 Tensilica, Inc.
8 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
11 * Chris Zankel <chris@zankel.net>
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>
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",
42 #ifdef CONFIG_DEBUG_STACKOVERFLOW
43 /* Debugging check for stack overflow: is there less than 1KB free? */
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
));
55 generic_handle_irq(irq
);
58 int arch_show_interrupts(struct seq_file
*p
, int prec
)
61 show_ipi_list(p
, prec
);
63 seq_printf(p
, "%*s: ", prec
, "ERR");
64 seq_printf(p
, "%10u\n", atomic_read(&irq_err_count
));
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))
74 if (intsize
== 2 && intspec
[1] == 1) {
75 int_irq
= xtensa_map_ext_irq(ext_irq
);
76 if (int_irq
< XCHAL_NUM_INTERRUPTS
)
83 *out_type
= IRQ_TYPE_NONE
;
87 int xtensa_irq_map(struct irq_domain
*d
, unsigned int irq
,
90 struct irq_chip
*irq_chip
= d
->host_data
;
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
);
118 unsigned xtensa_map_ext_irq(unsigned ext_irq
)
120 unsigned mask
= XCHAL_INTTYPE_MASK_EXTERN_EDGE
|
121 XCHAL_INTTYPE_MASK_EXTERN_LEVEL
;
124 for (i
= 0; mask
; ++i
, mask
>>= 1) {
125 if ((mask
& 1) && ext_irq
-- == 0)
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
) &
136 return hweight32(mask
);
139 void __init
init_IRQ(void)
144 #ifdef CONFIG_HAVE_SMP
145 xtensa_mx_init_legacy(NULL
);
147 xtensa_pic_init_legacy(NULL
);
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
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
);
171 if (irqd_is_per_cpu(data
))
174 if (!cpumask_test_cpu(cpu
, data
->affinity
))
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",
183 cpumask_setall(data
->affinity
);
185 irq_set_affinity(i
, data
->affinity
);
188 #endif /* CONFIG_HOTPLUG_CPU */