arch/sh/cchips/voyagergx/irq.c

   1 /* -------------------------------------------------------------------- */
   2 /* setup_voyagergx.c:                                                     */
   3 /* -------------------------------------------------------------------- */
   4 /*  This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18     Copyright 2003 (c) Lineo uSolutions,Inc.
  19 */
  20 /* -------------------------------------------------------------------- */
  21
  22 #undef DEBUG
  23
  24 #include <linux/sched.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/param.h>
  28 #include <linux/ioport.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/init.h>
  31 #include <linux/irq.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/irq.h>
  35 #include <asm/voyagergx.h>
  36
  37 static void disable_voyagergx_irq(unsigned int irq)
  38 {
  39         unsigned long val;
  40         unsigned long mask = 1 << (irq - VOYAGER_IRQ_BASE);
  41
  42         pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
  43         val = inl(VOYAGER_INT_MASK);
  44         val &= ~mask;
  45         outl(val, VOYAGER_INT_MASK);
  46 }
  47
  48 static void enable_voyagergx_irq(unsigned int irq)
  49 {
  50         unsigned long val;
  51         unsigned long mask = 1 << (irq - VOYAGER_IRQ_BASE);
  52
  53         pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
  54         val = inl(VOYAGER_INT_MASK);
  55         val |= mask;
  56         outl(val, VOYAGER_INT_MASK);
  57 }
  58
  59 static void mask_and_ack_voyagergx(unsigned int irq)
  60 {
  61         disable_voyagergx_irq(irq);
  62 }
  63
  64 static void end_voyagergx_irq(unsigned int irq)
  65 {
  66         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  67                 enable_voyagergx_irq(irq);
  68 }
  69
  70 static unsigned int startup_voyagergx_irq(unsigned int irq)
  71 {
  72         enable_voyagergx_irq(irq);
  73         return 0;
  74 }
  75
  76 static void shutdown_voyagergx_irq(unsigned int irq)
  77 {
  78         disable_voyagergx_irq(irq);
  79 }
  80
  81 static struct hw_interrupt_type voyagergx_irq_type = {
  82         .typename = "VOYAGERGX-IRQ",
  83         .startup = startup_voyagergx_irq,
  84         .shutdown = shutdown_voyagergx_irq,
  85         .enable = enable_voyagergx_irq,
  86         .disable = disable_voyagergx_irq,
  87         .ack = mask_and_ack_voyagergx,
  88         .end = end_voyagergx_irq,
  89 };
  90
  91 static irqreturn_t voyagergx_interrupt(int irq, void *dev_id,
  92                                       struct pt_regs *regs)
  93 {
  94         printk(KERN_INFO
  95                "VoyagerGX: spurious interrupt, status: 0x%x\n",
  96                         inl(INT_STATUS));
  97         return IRQ_HANDLED;
  98 }
  99
 100 static struct {
 101         int (*func)(int, void *);
 102         void *dev;
 103 } voyagergx_demux[VOYAGER_IRQ_NUM];
 104
 105 void voyagergx_register_irq_demux(int irq,
 106                 int (*demux)(int irq, void *dev), void *dev)
 107 {
 108         voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = demux;
 109         voyagergx_demux[irq - VOYAGER_IRQ_BASE].dev = dev;
 110 }
 111
 112 void voyagergx_unregister_irq_demux(int irq)
 113 {
 114         voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = 0;
 115 }
 116
 117 int voyagergx_irq_demux(int irq)
 118 {
 119
 120         if (irq == IRQ_VOYAGER ) {
 121                 unsigned long i = 0, bit __attribute__ ((unused));
 122                 unsigned long val  = inl(INT_STATUS);
 123 #if 1
 124                 if ( val & ( 1 << 1 )){
 125                         i = 1;
 126                 } else if ( val & ( 1 << 2 )){
 127                         i = 2;
 128                 } else if ( val & ( 1 << 6 )){
 129                         i = 6;
 130                 } else if( val & ( 1 << 10 )){
 131                         i = 10;
 132                 } else if( val & ( 1 << 11 )){
 133                         i = 11;
 134                 } else if( val & ( 1 << 12 )){
 135                         i = 12;
 136                 } else if( val & ( 1 << 17 )){
 137                         i = 17;
 138                 } else {
 139                         printk("Unexpected IRQ irq = %d status = 0x%08lx\n", irq, val);
 140                 }
 141                 pr_debug("voyagergx_irq_demux %d \n", i);
 142 #else
 143                 for (bit = 1, i = 0 ; i < VOYAGER_IRQ_NUM ; bit <<= 1, i++)
 144                         if (val & bit)
 145                                 break;
 146 #endif
 147                 if (i < VOYAGER_IRQ_NUM) {
 148                         irq = VOYAGER_IRQ_BASE + i;
 149                         if (voyagergx_demux[i].func != 0)
 150                                 irq = voyagergx_demux[i].func(irq, voyagergx_demux[i].dev);
 151                 }
 152         }
 153         return irq;
 154 }
 155
 156 static struct irqaction irq0  = {
 157         .name           = "voyagergx",
 158         .handler        = voyagergx_interrupt,
 159         .flags          = IRQF_DISABLED,
 160         .mask           = CPU_MASK_NONE,
 161 };
 162
 163 void __init setup_voyagergx_irq(void)
 164 {
 165         int i, flag;
 166
 167         printk(KERN_INFO "VoyagerGX configured at 0x%x on irq %d(mapped into %d to %d)\n",
 168                VOYAGER_BASE,
 169                IRQ_VOYAGER,
 170                VOYAGER_IRQ_BASE,
 171                VOYAGER_IRQ_BASE + VOYAGER_IRQ_NUM - 1);
 172
 173         for (i=0; i<VOYAGER_IRQ_NUM; i++) {
 174                 flag = 0;
 175                 switch (VOYAGER_IRQ_BASE + i) {
 176                 case VOYAGER_USBH_IRQ:
 177                 case VOYAGER_8051_IRQ:
 178                 case VOYAGER_UART0_IRQ:
 179                 case VOYAGER_UART1_IRQ:
 180                 case VOYAGER_AC97_IRQ:
 181                         flag = 1;
 182                 }
 183                 if (flag == 1)
 184                         irq_desc[VOYAGER_IRQ_BASE + i].chip = &voyagergx_irq_type;
 185         }
 186
 187         setup_irq(IRQ_VOYAGER, &irq0);
 188 }
 189