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1394f032 | 1 | /* |
96f1050d | 2 | * Copyright 2005-2009 Analog Devices Inc. |
1394f032 | 3 | * |
96f1050d | 4 | * Licensed under the GPL-2 or later |
1394f032 BW |
5 | */ |
6 | ||
7 | #include <linux/kernel_stat.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/random.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/kallsyms.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/irq.h> | |
518039bc | 14 | #include <asm/trace.h> |
3605fb09 | 15 | #include <asm/pda.h> |
1394f032 | 16 | |
8f65873e | 17 | static atomic_t irq_err_count; |
1394f032 BW |
18 | void ack_bad_irq(unsigned int irq) |
19 | { | |
8f65873e | 20 | atomic_inc(&irq_err_count); |
1394f032 BW |
21 | printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq); |
22 | } | |
1394f032 | 23 | |
1394f032 | 24 | static struct irq_desc bad_irq_desc = { |
1394f032 | 25 | .handle_irq = handle_bad_irq, |
71a7d155 | 26 | .lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock), |
1394f032 BW |
27 | }; |
28 | ||
e65e49d0 MT |
29 | #ifdef CONFIG_CPUMASK_OFFSTACK |
30 | /* We are not allocating a variable-sized bad_irq_desc.affinity */ | |
31 | #error "Blackfin architecture does not support CONFIG_CPUMASK_OFFSTACK." | |
32 | #endif | |
33 | ||
46f288a0 | 34 | #ifdef CONFIG_PROC_FS |
1394f032 BW |
35 | int show_interrupts(struct seq_file *p, void *v) |
36 | { | |
8f65873e | 37 | int i = *(loff_t *) v, j; |
1394f032 BW |
38 | struct irqaction *action; |
39 | unsigned long flags; | |
40 | ||
41 | if (i < NR_IRQS) { | |
42 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
43 | action = irq_desc[i].action; | |
44 | if (!action) | |
8f65873e GY |
45 | goto skip; |
46 | seq_printf(p, "%3d: ", i); | |
47 | for_each_online_cpu(j) | |
dee4102a | 48 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); |
8f65873e | 49 | seq_printf(p, " %8s", irq_desc[i].chip->name); |
1394f032 BW |
50 | seq_printf(p, " %s", action->name); |
51 | for (action = action->next; action; action = action->next) | |
8f65873e | 52 | seq_printf(p, " %s", action->name); |
1394f032 BW |
53 | |
54 | seq_putc(p, '\n'); | |
8f65873e | 55 | skip: |
1394f032 | 56 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
3605fb09 RG |
57 | } else if (i == NR_IRQS) { |
58 | seq_printf(p, "NMI: "); | |
59 | for_each_online_cpu(j) | |
60 | seq_printf(p, "%10u ", cpu_pda[j].__nmi_count); | |
61 | seq_printf(p, " CORE Non Maskable Interrupt\n"); | |
8f65873e | 62 | seq_printf(p, "Err: %10u\n", atomic_read(&irq_err_count)); |
3605fb09 | 63 | } |
1394f032 BW |
64 | return 0; |
65 | } | |
46f288a0 | 66 | #endif |
1394f032 | 67 | |
6f10fdab MF |
68 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
69 | static void check_stack_overflow(int irq) | |
70 | { | |
71 | /* Debugging check for stack overflow: is there less than STACK_WARN free? */ | |
72 | long sp = __get_SP() & (THREAD_SIZE - 1); | |
73 | ||
74 | if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { | |
75 | dump_stack(); | |
76 | pr_emerg("irq%i: possible stack overflow only %ld bytes free\n", | |
77 | irq, sp - sizeof(struct thread_info)); | |
78 | } | |
79 | } | |
80 | #else | |
81 | static inline void check_stack_overflow(int irq) { } | |
82 | #endif | |
83 | ||
81b79c21 MF |
84 | #ifndef CONFIG_IPIPE |
85 | static void maybe_lower_to_irq14(void) | |
86 | { | |
87 | unsigned short pending, other_ints; | |
88 | ||
89 | /* | |
90 | * If we're the only interrupt running (ignoring IRQ15 which | |
91 | * is for syscalls), lower our priority to IRQ14 so that | |
92 | * softirqs run at that level. If there's another, | |
93 | * lower-level interrupt, irq_exit will defer softirqs to | |
94 | * that. If the interrupt pipeline is enabled, we are already | |
95 | * running at IRQ14 priority, so we don't need this code. | |
96 | */ | |
97 | CSYNC(); | |
98 | pending = bfin_read_IPEND() & ~0x8000; | |
99 | other_ints = pending & (pending - 1); | |
100 | if (other_ints == 0) | |
101 | lower_to_irq14(); | |
102 | } | |
103 | #else | |
104 | static inline void maybe_lower_to_irq14(void) { } | |
105 | #endif | |
106 | ||
1394f032 | 107 | /* |
d2d50aa9 | 108 | * do_IRQ handles all hardware IRQs. Decoded IRQs should not |
1394f032 BW |
109 | * come via this function. Instead, they should provide their |
110 | * own 'handler' | |
111 | */ | |
1394f032 | 112 | #ifdef CONFIG_DO_IRQ_L1 |
f0b5d12f | 113 | __attribute__((l1_text)) |
1394f032 | 114 | #endif |
1394f032 BW |
115 | asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs) |
116 | { | |
26579216 | 117 | struct pt_regs *old_regs = set_irq_regs(regs); |
1394f032 BW |
118 | |
119 | irq_enter(); | |
26579216 | 120 | |
6f10fdab | 121 | check_stack_overflow(irq); |
26579216 MF |
122 | |
123 | /* | |
124 | * Some hardware gives randomly wrong interrupts. Rather | |
125 | * than crashing, do something sensible. | |
126 | */ | |
127 | if (irq >= NR_IRQS) | |
128 | handle_bad_irq(irq, &bad_irq_desc); | |
129 | else | |
130 | generic_handle_irq(irq); | |
1394f032 | 131 | |
81b79c21 MF |
132 | maybe_lower_to_irq14(); |
133 | ||
1394f032 BW |
134 | irq_exit(); |
135 | ||
136 | set_irq_regs(old_regs); | |
137 | } | |
138 | ||
139 | void __init init_IRQ(void) | |
140 | { | |
1394f032 | 141 | init_arch_irq(); |
518039bc RG |
142 | |
143 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND | |
144 | /* Now that evt_ivhw is set up, turn this on */ | |
145 | trace_buff_offset = 0; | |
146 | bfin_write_TBUFCTL(BFIN_TRACE_ON); | |
147 | printk(KERN_INFO "Hardware Trace expanded to %ik\n", | |
148 | 1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN); | |
149 | #endif | |
1394f032 | 150 | } |