arch/arm/plat-orion/irq.c

   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,
  32                                     handle_level_irq);
  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,
  37                                IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
  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;
  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,
  56                               &irq_domain_simple_ops, NULL);
  57         return 0;
  58 }
  59
  60 static const struct of_device_id orion_irq_match[] = {
  61         { .compatible = "marvell,orion-intc",
  62           .data = orion_add_irq_domain, },
  63         {},
  64 };
  65
  66 void __init orion_dt_init_irq(void)
  67 {
  68         of_irq_init(orion_irq_match);
  69 }
  70 #endif