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 <asm/exception.h>
  19 #include <plat/irq.h>
  20 #include <plat/orion-gpio.h>
  21
  22 void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
  23 {
  24         struct irq_chip_generic *gc;
  25         struct irq_chip_type *ct;
  26
  27         /*
  28          * Mask all interrupts initially.
  29          */
  30         writel(0, maskaddr);
  31
  32         gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr,
  33                                     handle_level_irq);
  34         ct = gc->chip_types;
  35         ct->chip.irq_mask = irq_gc_mask_clr_bit;
  36         ct->chip.irq_unmask = irq_gc_mask_set_bit;
  37         irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
  38                                IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
  39 }