Linux Kernel  3.7.1
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irq.c
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1 /*
2  * arch/arm/plat-orion/irq.c
3  *
4  * Marvell Orion SoC IRQ handling.
5  *
6  * This file is licensed under the terms of the GNU General Public
7  * License version 2. This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/irqdomain.h>
15 #include <linux/io.h>
16 #include <linux/of_address.h>
17 #include <linux/of_irq.h>
18 #include <plat/irq.h>
19 #include <plat/orion-gpio.h>
20 
21 void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
22 {
23  struct irq_chip_generic *gc;
24  struct irq_chip_type *ct;
25 
26  /*
27  * Mask all interrupts initially.
28  */
29  writel(0, maskaddr);
30 
31  gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr,
33  ct = gc->chip_types;
34  ct->chip.irq_mask = irq_gc_mask_clr_bit;
35  ct->chip.irq_unmask = irq_gc_mask_set_bit;
36  irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
38 }
39 
40 #ifdef CONFIG_OF
41 static int __init orion_add_irq_domain(struct device_node *np,
42  struct device_node *interrupt_parent)
43 {
44  int i = 0, irq_gpio;
45  void __iomem *base;
46 
47  do {
48  base = of_iomap(np, i);
49  if (base) {
50  orion_irq_init(i * 32, base);
51  i++;
52  }
53  } while (base);
54 
55  irq_domain_add_legacy(np, i * 32, 0, 0,
57 
58  irq_gpio = i * 32;
59  orion_gpio_of_init(irq_gpio);
60 
61  return 0;
62 }
63 
64 static const struct of_device_id orion_irq_match[] = {
65  { .compatible = "marvell,orion-intc",
66  .data = orion_add_irq_domain, },
67  {},
68 };
69 
70 void __init orion_dt_init_irq(void)
71 {
72  of_irq_init(orion_irq_match);
73 }
74 #endif