blob: 70bdf6edb7bbb311bdb386535356cade99abacd2 [file] [log] [blame]
Uwe Kleine-König292ec082013-06-26 09:18:48 +02001/*
2 * drivers/irq/irq-nvic.c
3 *
4 * Copyright (C) 2008 ARM Limited, All Rights Reserved.
5 * Copyright (C) 2013 Pengutronix
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Support for the Nested Vectored Interrupt Controller found on the
12 * ARMv7-M CPUs (Cortex-M3/M4)
13 */
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/slab.h>
19#include <linux/err.h>
20#include <linux/io.h>
21#include <linux/of.h>
22#include <linux/of_address.h>
23#include <linux/irq.h>
24#include <linux/irqdomain.h>
25
26#include <asm/v7m.h>
27#include <asm/exception.h>
28
29#include "irqchip.h"
30
31#define NVIC_ISER 0x000
32#define NVIC_ICER 0x080
33#define NVIC_IPR 0x300
34
35#define NVIC_MAX_BANKS 16
36/*
37 * Each bank handles 32 irqs. Only the 16th (= last) bank handles only
38 * 16 irqs.
39 */
40#define NVIC_MAX_IRQ ((NVIC_MAX_BANKS - 1) * 32 + 16)
41
42static struct irq_domain *nvic_irq_domain;
43
44asmlinkage void __exception_irq_entry
45nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
46{
47 unsigned int irq = irq_linear_revmap(nvic_irq_domain, hwirq);
48
49 handle_IRQ(irq, regs);
50}
51
52static void nvic_eoi(struct irq_data *d)
53{
54 /*
55 * This is a no-op as end of interrupt is signaled by the exception
56 * return sequence.
57 */
58}
59
60static int __init nvic_of_init(struct device_node *node,
61 struct device_node *parent)
62{
63 unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
64 unsigned int irqs, i, ret, numbanks;
65 void __iomem *nvic_base;
66
67 numbanks = (readl_relaxed(V7M_SCS_ICTR) &
68 V7M_SCS_ICTR_INTLINESNUM_MASK) + 1;
69
70 nvic_base = of_iomap(node, 0);
71 if (!nvic_base) {
72 pr_warn("unable to map nvic registers\n");
73 return -ENOMEM;
74 }
75
76 irqs = numbanks * 32;
77 if (irqs > NVIC_MAX_IRQ)
78 irqs = NVIC_MAX_IRQ;
79
80 nvic_irq_domain =
81 irq_domain_add_linear(node, irqs, &irq_generic_chip_ops, NULL);
82 if (!nvic_irq_domain) {
83 pr_warn("Failed to allocate irq domain\n");
84 return -ENOMEM;
85 }
86
Axel Lin5b8aae42013-07-05 15:39:11 +080087 ret = irq_alloc_domain_generic_chips(nvic_irq_domain, 32, 1,
Uwe Kleine-König292ec082013-06-26 09:18:48 +020088 "nvic_irq", handle_fasteoi_irq,
89 clr, 0, IRQ_GC_INIT_MASK_CACHE);
90 if (ret) {
91 pr_warn("Failed to allocate irq chips\n");
92 irq_domain_remove(nvic_irq_domain);
93 return ret;
94 }
95
96 for (i = 0; i < numbanks; ++i) {
97 struct irq_chip_generic *gc;
98
99 gc = irq_get_domain_generic_chip(nvic_irq_domain, 32 * i);
100 gc->reg_base = nvic_base + 4 * i;
101 gc->chip_types[0].regs.enable = NVIC_ISER;
102 gc->chip_types[0].regs.disable = NVIC_ICER;
103 gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
104 gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
105 gc->chip_types[0].chip.irq_eoi = nvic_eoi;
106
107 /* disable interrupts */
108 writel_relaxed(~0, gc->reg_base + NVIC_ICER);
109 }
110
111 /* Set priority on all interrupts */
112 for (i = 0; i < irqs; i += 4)
113 writel_relaxed(0, nvic_base + NVIC_IPR + i);
114
115 return 0;
116}
117IRQCHIP_DECLARE(armv7m_nvic, "arm,armv7m-nvic", nvic_of_init);