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Linux/arch/mips/sni/irq.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1992 Linus Torvalds
  7  * Copyright (C) 1994 - 2000 Ralf Baechle
  8  * Copyright (C) 2006 Thomas Bogendoerfer
  9  */
 10 #include <linux/delay.h>
 11 #include <linux/init.h>
 12 #include <linux/interrupt.h>
 13 #include <linux/irq.h>
 14 #include <linux/kernel.h>
 15 
 16 #include <asm/i8259.h>
 17 #include <asm/io.h>
 18 #include <asm/sni.h>
 19 #include <asm/irq.h>
 20 #include <asm/irq_cpu.h>
 21 
 22 void (*sni_hwint)(void);
 23 
 24 asmlinkage void plat_irq_dispatch(void)
 25 {
 26         sni_hwint();
 27 }
 28 
 29 /* ISA irq handler */
 30 static irqreturn_t sni_isa_irq_handler(int dummy, void *p)
 31 {
 32         int irq;
 33 
 34         irq = i8259_irq();
 35         if (unlikely(irq < 0))
 36                 return IRQ_NONE;
 37 
 38         generic_handle_irq(irq);
 39         return IRQ_HANDLED;
 40 }
 41 
 42 struct irqaction sni_isa_irq = {
 43         .handler = sni_isa_irq_handler,
 44         .name = "ISA",
 45         .flags = IRQF_SHARED | IRQF_DISABLED
 46 };
 47 
 48 /*
 49  * On systems with i8259-style interrupt controllers we assume for
 50  * driver compatibility reasons interrupts 0 - 15 to be the i8295
 51  * interrupts even if the hardware uses a different interrupt numbering.
 52  */
 53 void __init arch_init_irq(void)
 54 {
 55         init_i8259_irqs();                      /* Integrated i8259  */
 56         switch (sni_brd_type) {
 57         case SNI_BRD_10:
 58         case SNI_BRD_10NEW:
 59         case SNI_BRD_TOWER_OASIC:
 60         case SNI_BRD_MINITOWER:
 61                 sni_a20r_irq_init();
 62                 break;
 63 
 64         case SNI_BRD_PCI_TOWER:
 65                 sni_pcit_irq_init();
 66                 break;
 67 
 68         case SNI_BRD_PCI_TOWER_CPLUS:
 69                 sni_pcit_cplus_irq_init();
 70                 break;
 71 
 72         case SNI_BRD_RM200:
 73                 sni_rm200_irq_init();
 74                 break;
 75 
 76         case SNI_BRD_PCI_MTOWER:
 77         case SNI_BRD_PCI_DESKTOP:
 78         case SNI_BRD_PCI_MTOWER_CPLUS:
 79                 sni_pcimt_irq_init();
 80                 break;
 81         }
 82 }
 83 

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