arch/arm/mach-clps711x/irq.c

   1 /*
   2  *  linux/arch/arm/mach-clps711x/irq.c
   3  *
   4  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/io.h>
  23
  24 #include <asm/mach/irq.h>
  25 #include <mach/hardware.h>
  26 #include <asm/irq.h>
  27
  28 #include <asm/hardware/clps7111.h>
  29
  30 static void int1_mask(struct irq_data *d)
  31 {
  32         u32 intmr1;
  33
  34         intmr1 = clps_readl(INTMR1);
  35         intmr1 &= ~(1 << d->irq);
  36         clps_writel(intmr1, INTMR1);
  37 }
  38
  39 static void int1_ack(struct irq_data *d)
  40 {
  41         u32 intmr1;
  42
  43         intmr1 = clps_readl(INTMR1);
  44         intmr1 &= ~(1 << d->irq);
  45         clps_writel(intmr1, INTMR1);
  46
  47         switch (d->irq) {
  48         case IRQ_CSINT:  clps_writel(0, COEOI);  break;
  49         case IRQ_TC1OI:  clps_writel(0, TC1EOI); break;
  50         case IRQ_TC2OI:  clps_writel(0, TC2EOI); break;
  51         case IRQ_RTCMI:  clps_writel(0, RTCEOI); break;
  52         case IRQ_TINT:   clps_writel(0, TEOI);   break;
  53         case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
  54         }
  55 }
  56
  57 static void int1_unmask(struct irq_data *d)
  58 {
  59         u32 intmr1;
  60
  61         intmr1 = clps_readl(INTMR1);
  62         intmr1 |= 1 << d->irq;
  63         clps_writel(intmr1, INTMR1);
  64 }
  65
  66 static struct irq_chip int1_chip = {
  67         .irq_ack        = int1_ack,
  68         .irq_mask       = int1_mask,
  69         .irq_unmask     = int1_unmask,
  70 };
  71
  72 static void int2_mask(struct irq_data *d)
  73 {
  74         u32 intmr2;
  75
  76         intmr2 = clps_readl(INTMR2);
  77         intmr2 &= ~(1 << (d->irq - 16));
  78         clps_writel(intmr2, INTMR2);
  79 }
  80
  81 static void int2_ack(struct irq_data *d)
  82 {
  83         u32 intmr2;
  84
  85         intmr2 = clps_readl(INTMR2);
  86         intmr2 &= ~(1 << (d->irq - 16));
  87         clps_writel(intmr2, INTMR2);
  88
  89         switch (d->irq) {
  90         case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
  91         }
  92 }
  93
  94 static void int2_unmask(struct irq_data *d)
  95 {
  96         u32 intmr2;
  97
  98         intmr2 = clps_readl(INTMR2);
  99         intmr2 |= 1 << (d->irq - 16);
 100         clps_writel(intmr2, INTMR2);
 101 }
 102
 103 static struct irq_chip int2_chip = {
 104         .irq_ack        = int2_ack,
 105         .irq_mask       = int2_mask,
 106         .irq_unmask     = int2_unmask,
 107 };
 108
 109 void __init clps711x_init_irq(void)
 110 {
 111         unsigned int i;
 112
 113         for (i = 0; i < NR_IRQS; i++) {
 114                 if (INT1_IRQS & (1 << i)) {
 115                         irq_set_chip_and_handler(i, &int1_chip,
 116                                                  handle_level_irq);
 117                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 118                 }
 119                 if (INT2_IRQS & (1 << i)) {
 120                         irq_set_chip_and_handler(i, &int2_chip,
 121                                                  handle_level_irq);
 122                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 123                 }
 124         }
 125
 126         /*
 127          * Disable interrupts
 128          */
 129         clps_writel(0, INTMR1);
 130         clps_writel(0, INTMR2);
 131
 132         /*
 133          * Clear down any pending interrupts
 134          */
 135         clps_writel(0, COEOI);
 136         clps_writel(0, TC1EOI);
 137         clps_writel(0, TC2EOI);
 138         clps_writel(0, RTCEOI);
 139         clps_writel(0, TEOI);
 140         clps_writel(0, UMSEOI);
 141         clps_writel(0, SYNCIO);
 142         clps_writel(0, KBDEOI);
 143 }