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/io.h>
  15 #include <plat/irq.h>
  16
  17 void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
  18 {
  19         struct irq_chip_generic *gc;
  20         struct irq_chip_type *ct;
  21
  22         /*
  23          * Mask all interrupts initially.
  24          */
  25         writel(0, maskaddr);
  26
  27         gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr,
  28                                     handle_level_irq);
  29         ct = gc->chip_types;
  30         ct->chip.irq_mask = irq_gc_mask_clr_bit;
  31         ct->chip.irq_unmask = irq_gc_mask_set_bit;
  32         irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
  33                                IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
  34 }