1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
* Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <asm/mach_desc.h>
#include <asm/smp.h>
/*
* Late Interrupt system init called from start_kernel for Boot CPU only
*
* Since slab must already be initialized, platforms can start doing any
* needed request_irq( )s
*/
void __init init_IRQ(void)
{
/*
* process the entire interrupt tree in one go
* Any external intc will be setup provided DT chains them
* properly
*/
irqchip_init();
#ifdef CONFIG_SMP
/* a SMP H/w block could do IPI IRQ request here */
if (plat_smp_ops.init_per_cpu)
plat_smp_ops.init_per_cpu(smp_processor_id());
if (machine_desc->init_per_cpu)
machine_desc->init_per_cpu(smp_processor_id());
#endif
}
/*
* "C" Entry point for any ARC ISR, called from low level vector handler
* @irq is the vector number read from ICAUSE reg of on-chip intc
*/
void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
generic_handle_irq(irq);
irq_exit();
set_irq_regs(old_regs);
}
/*
* API called for requesting percpu interrupts - called by each CPU
* - For boot CPU, actually request the IRQ with genirq core + enables
* - For subsequent callers only enable called locally
*
* Relies on being called by boot cpu first (i.e. request called ahead) of
* any enable as expected by genirq. Hence Suitable only for TIMER, IPI
* which are guaranteed to be setup on boot core first.
* Late probed peripherals such as perf can't use this as there no guarantee
* of being called on boot CPU first.
*/
void arc_request_percpu_irq(int irq, int cpu,
irqreturn_t (*isr)(int irq, void *dev),
const char *irq_nm,
void *percpu_dev)
{
/* Boot cpu calls request, all call enable */
if (!cpu) {
int rc;
rc = request_percpu_irq(irq, isr, irq_nm, percpu_dev);
if (rc)
panic("Percpu IRQ request failed for %d\n", irq);
}
enable_percpu_irq(irq, 0);
}
|
