arch/mips/powertv/asic/irq_asic.c

   1 /*
   2  * Portions copyright (C) 2005-2009 Scientific Atlanta
   3  * Portions copyright (C) 2009 Cisco Systems, Inc.
   4  *
   5  * Modified from arch/mips/kernel/irq-rm7000.c:
   6  * Copyright (C) 2003 Ralf Baechle
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/kernel.h>
  16 #include <linux/irq.h>
  17
  18 #include <asm/irq_cpu.h>
  19 #include <asm/mipsregs.h>
  20
  21 #include <asm/mach-powertv/asic_regs.h>
  22
  23 static inline void unmask_asic_irq(struct irq_data *d)
  24 {
  25         unsigned long enable_bit;
  26         unsigned int irq = d->irq;
  27
  28         enable_bit = (1 << (irq & 0x1f));
  29
  30         switch (irq >> 5) {
  31         case 0:
  32                 asic_write(asic_read(ien_int_0) | enable_bit, ien_int_0);
  33                 break;
  34         case 1:
  35                 asic_write(asic_read(ien_int_1) | enable_bit, ien_int_1);
  36                 break;
  37         case 2:
  38                 asic_write(asic_read(ien_int_2) | enable_bit, ien_int_2);
  39                 break;
  40         case 3:
  41                 asic_write(asic_read(ien_int_3) | enable_bit, ien_int_3);
  42                 break;
  43         default:
  44                 BUG();
  45         }
  46 }
  47
  48 static inline void mask_asic_irq(struct irq_data *d)
  49 {
  50         unsigned long disable_mask;
  51         unsigned int irq = d->irq;
  52
  53         disable_mask = ~(1 << (irq & 0x1f));
  54
  55         switch (irq >> 5) {
  56         case 0:
  57                 asic_write(asic_read(ien_int_0) & disable_mask, ien_int_0);
  58                 break;
  59         case 1:
  60                 asic_write(asic_read(ien_int_1) & disable_mask, ien_int_1);
  61                 break;
  62         case 2:
  63                 asic_write(asic_read(ien_int_2) & disable_mask, ien_int_2);
  64                 break;
  65         case 3:
  66                 asic_write(asic_read(ien_int_3) & disable_mask, ien_int_3);
  67                 break;
  68         default:
  69                 BUG();
  70         }
  71 }
  72
  73 static struct irq_chip asic_irq_chip = {
  74         .name = "ASIC Level",
  75         .irq_mask = mask_asic_irq,
  76         .irq_unmask = unmask_asic_irq,
  77 };
  78
  79 void __init asic_irq_init(void)
  80 {
  81         int i;
  82
  83         /* set priority to 0 */
  84         write_c0_status(read_c0_status() & ~(0x0000fc00));
  85
  86         asic_write(0, ien_int_0);
  87         asic_write(0, ien_int_1);
  88         asic_write(0, ien_int_2);
  89         asic_write(0, ien_int_3);
  90
  91         asic_write(0x0fffffff, int_level_3_3);
  92         asic_write(0xffffffff, int_level_3_2);
  93         asic_write(0xffffffff, int_level_3_1);
  94         asic_write(0xffffffff, int_level_3_0);
  95         asic_write(0xffffffff, int_level_2_3);
  96         asic_write(0xffffffff, int_level_2_2);
  97         asic_write(0xffffffff, int_level_2_1);
  98         asic_write(0xffffffff, int_level_2_0);
  99         asic_write(0xffffffff, int_level_1_3);
 100         asic_write(0xffffffff, int_level_1_2);
 101         asic_write(0xffffffff, int_level_1_1);
 102         asic_write(0xffffffff, int_level_1_0);
 103         asic_write(0xffffffff, int_level_0_3);
 104         asic_write(0xffffffff, int_level_0_2);
 105         asic_write(0xffffffff, int_level_0_1);
 106         asic_write(0xffffffff, int_level_0_0);
 107
 108         asic_write(0xf, int_int_scan);
 109
 110         /*
 111          * Initialize interrupt handlers.
 112          */
 113         for (i = 0; i < NR_IRQS; i++)
 114                 irq_set_chip_and_handler(i, &asic_irq_chip, handle_level_irq);
 115 }