Commit | Line | Data |
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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> | |
e8fac633 | 14 | #include <linux/seq_file.h> |
6327a574 | 15 | #include <asm/irq_handler.h> |
518039bc | 16 | #include <asm/trace.h> |
3605fb09 | 17 | #include <asm/pda.h> |
1394f032 | 18 | |
8f65873e | 19 | static atomic_t irq_err_count; |
1394f032 BW |
20 | void ack_bad_irq(unsigned int irq) |
21 | { | |
8f65873e | 22 | atomic_inc(&irq_err_count); |
1394f032 BW |
23 | printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq); |
24 | } | |
1394f032 | 25 | |
1394f032 | 26 | static struct irq_desc bad_irq_desc = { |
1394f032 | 27 | .handle_irq = handle_bad_irq, |
239007b8 | 28 | .lock = __RAW_SPIN_LOCK_UNLOCKED(bad_irq_desc.lock), |
1394f032 BW |
29 | }; |
30 | ||
e65e49d0 MT |
31 | #ifdef CONFIG_CPUMASK_OFFSTACK |
32 | /* We are not allocating a variable-sized bad_irq_desc.affinity */ | |
33 | #error "Blackfin architecture does not support CONFIG_CPUMASK_OFFSTACK." | |
34 | #endif | |
35 | ||
46f288a0 | 36 | #ifdef CONFIG_PROC_FS |
e8fac633 | 37 | int arch_show_interrupts(struct seq_file *p, int prec) |
1394f032 | 38 | { |
e8fac633 | 39 | int j; |
1394f032 | 40 | |
e8fac633 TG |
41 | seq_printf(p, "%*s: ", prec, "NMI"); |
42 | for_each_online_cpu(j) | |
43 | seq_printf(p, "%10u ", cpu_pda[j].__nmi_count); | |
44 | seq_printf(p, " CORE Non Maskable Interrupt\n"); | |
45 | seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); | |
1394f032 BW |
46 | return 0; |
47 | } | |
46f288a0 | 48 | #endif |
1394f032 | 49 | |
6f10fdab MF |
50 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
51 | static void check_stack_overflow(int irq) | |
52 | { | |
53 | /* Debugging check for stack overflow: is there less than STACK_WARN free? */ | |
54 | long sp = __get_SP() & (THREAD_SIZE - 1); | |
55 | ||
56 | if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { | |
57 | dump_stack(); | |
58 | pr_emerg("irq%i: possible stack overflow only %ld bytes free\n", | |
59 | irq, sp - sizeof(struct thread_info)); | |
60 | } | |
61 | } | |
62 | #else | |
63 | static inline void check_stack_overflow(int irq) { } | |
64 | #endif | |
65 | ||
81b79c21 MF |
66 | #ifndef CONFIG_IPIPE |
67 | static void maybe_lower_to_irq14(void) | |
68 | { | |
69 | unsigned short pending, other_ints; | |
70 | ||
71 | /* | |
72 | * If we're the only interrupt running (ignoring IRQ15 which | |
73 | * is for syscalls), lower our priority to IRQ14 so that | |
74 | * softirqs run at that level. If there's another, | |
75 | * lower-level interrupt, irq_exit will defer softirqs to | |
76 | * that. If the interrupt pipeline is enabled, we are already | |
77 | * running at IRQ14 priority, so we don't need this code. | |
78 | */ | |
79 | CSYNC(); | |
80 | pending = bfin_read_IPEND() & ~0x8000; | |
81 | other_ints = pending & (pending - 1); | |
82 | if (other_ints == 0) | |
83 | lower_to_irq14(); | |
84 | } | |
85 | #else | |
86 | static inline void maybe_lower_to_irq14(void) { } | |
87 | #endif | |
88 | ||
1394f032 | 89 | /* |
d2d50aa9 | 90 | * do_IRQ handles all hardware IRQs. Decoded IRQs should not |
1394f032 BW |
91 | * come via this function. Instead, they should provide their |
92 | * own 'handler' | |
93 | */ | |
1394f032 | 94 | #ifdef CONFIG_DO_IRQ_L1 |
f0b5d12f | 95 | __attribute__((l1_text)) |
1394f032 | 96 | #endif |
1394f032 BW |
97 | asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs) |
98 | { | |
26579216 | 99 | struct pt_regs *old_regs = set_irq_regs(regs); |
1394f032 BW |
100 | |
101 | irq_enter(); | |
26579216 | 102 | |
6f10fdab | 103 | check_stack_overflow(irq); |
26579216 MF |
104 | |
105 | /* | |
106 | * Some hardware gives randomly wrong interrupts. Rather | |
107 | * than crashing, do something sensible. | |
108 | */ | |
109 | if (irq >= NR_IRQS) | |
bd0b9ac4 | 110 | handle_bad_irq(&bad_irq_desc); |
26579216 MF |
111 | else |
112 | generic_handle_irq(irq); | |
1394f032 | 113 | |
81b79c21 MF |
114 | maybe_lower_to_irq14(); |
115 | ||
1394f032 BW |
116 | irq_exit(); |
117 | ||
118 | set_irq_regs(old_regs); | |
119 | } | |
120 | ||
121 | void __init init_IRQ(void) | |
122 | { | |
1394f032 | 123 | init_arch_irq(); |
518039bc RG |
124 | |
125 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND | |
126 | /* Now that evt_ivhw is set up, turn this on */ | |
127 | trace_buff_offset = 0; | |
128 | bfin_write_TBUFCTL(BFIN_TRACE_ON); | |
129 | printk(KERN_INFO "Hardware Trace expanded to %ik\n", | |
130 | 1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN); | |
131 | #endif | |
1394f032 | 132 | } |