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/rts7751r2d/rts7751r2d.h>
  36 #include <asm/rts7751r2d/voyagergx_reg.h>
  37
  38 static void disable_voyagergx_irq(unsigned int irq)
  39 {
  40         unsigned long flags, val;
  41         unsigned long  mask = 1 << (irq - VOYAGER_IRQ_BASE);
  42
  43         pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
  44         local_irq_save(flags);
  45         val = inl(VOYAGER_INT_MASK);
  46         val &= ~mask;
  47         outl(val, VOYAGER_INT_MASK);
  48         local_irq_restore(flags);
  49 }
  50
  51
  52 static void enable_voyagergx_irq(unsigned int irq)
  53 {
  54         unsigned long flags, val;
  55         unsigned long  mask = 1 << (irq - VOYAGER_IRQ_BASE);
  56
  57         pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
  58         local_irq_save(flags);
  59         val = inl(VOYAGER_INT_MASK);
  60         val |= mask;
  61         outl(val, VOYAGER_INT_MASK);
  62         local_irq_restore(flags);
  63 }
  64
  65
  66 static void mask_and_ack_voyagergx(unsigned int irq)
  67 {
  68         disable_voyagergx_irq(irq);
  69 }
  70
  71 static void end_voyagergx_irq(unsigned int irq)
  72 {
  73         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  74                 enable_voyagergx_irq(irq);
  75 }
  76
  77 static unsigned int startup_voyagergx_irq(unsigned int irq)
  78 {
  79         enable_voyagergx_irq(irq);
  80         return 0;
  81 }
  82
  83 static void shutdown_voyagergx_irq(unsigned int irq)
  84 {
  85         disable_voyagergx_irq(irq);
  86 }
  87
  88 static struct hw_interrupt_type voyagergx_irq_type = {
  89         .typename = "VOYAGERGX-IRQ",
  90         .startup = startup_voyagergx_irq,
  91         .shutdown = shutdown_voyagergx_irq,
  92         .enable = enable_voyagergx_irq,
  93         .disable = disable_voyagergx_irq,
  94         .ack = mask_and_ack_voyagergx,
  95         .end = end_voyagergx_irq,
  96 };
  97
  98 static irqreturn_t voyagergx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  99 {
 100         printk(KERN_INFO
 101                "VoyagerGX: spurious interrupt, status: 0x%x\n",
 102                         inl(INT_STATUS));
 103         return IRQ_HANDLED;
 104 }
 105
 106
 107 /*====================================================*/
 108
 109 static struct {
 110         int (*func)(int, void *);
 111         void *dev;
 112 } voyagergx_demux[VOYAGER_IRQ_NUM];
 113
 114 void voyagergx_register_irq_demux(int irq,
 115                 int (*demux)(int irq, void *dev), void *dev)
 116 {
 117         voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = demux;
 118         voyagergx_demux[irq - VOYAGER_IRQ_BASE].dev = dev;
 119 }
 120
 121 void voyagergx_unregister_irq_demux(int irq)
 122 {
 123         voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = 0;
 124 }
 125
 126 int voyagergx_irq_demux(int irq)
 127 {
 128
 129         if (irq == IRQ_VOYAGER ) {
 130                 unsigned long i = 0, bit __attribute__ ((unused));
 131                 unsigned long val  = inl(INT_STATUS);
 132 #if 1
 133                 if ( val & ( 1 << 1 )){
 134                         i = 1;
 135                 } else if ( val & ( 1 << 2 )){
 136                         i = 2;
 137                 } else if ( val & ( 1 << 6 )){
 138                         i = 6;
 139                 } else if( val & ( 1 << 10 )){
 140                         i = 10;
 141                 } else if( val & ( 1 << 11 )){
 142                         i = 11;
 143                 } else if( val & ( 1 << 12 )){
 144                         i = 12;
 145                 } else if( val & ( 1 << 17 )){
 146                         i = 17;
 147                 } else {
 148                         printk("Unexpected IRQ irq = %d status = 0x%08lx\n", irq, val);
 149                 }
 150                 pr_debug("voyagergx_irq_demux %d \n", i);
 151 #else
 152                 for (bit = 1, i = 0 ; i < VOYAGER_IRQ_NUM ; bit <<= 1, i++)
 153                         if (val & bit)
 154                                 break;
 155 #endif
 156                 if (i < VOYAGER_IRQ_NUM) {
 157                         irq = VOYAGER_IRQ_BASE + i;
 158                         if (voyagergx_demux[i].func != 0)
 159                                 irq = voyagergx_demux[i].func(irq, voyagergx_demux[i].dev);
 160                 }
 161         }
 162         return irq;
 163 }
 164
 165 static struct irqaction irq0  = {
 166         .name           = "voyagergx",
 167         .handler        = voyagergx_interrupt,
 168         .flags          = IRQF_DISABLED,
 169         .mask           = CPU_MASK_NONE,
 170 };
 171
 172 void __init setup_voyagergx_irq(void)
 173 {
 174         int i, flag;
 175
 176         printk(KERN_INFO "VoyagerGX configured at 0x%x on irq %d(mapped into %d to %d)\n",
 177                VOYAGER_BASE,
 178                IRQ_VOYAGER,
 179                VOYAGER_IRQ_BASE,
 180                VOYAGER_IRQ_BASE + VOYAGER_IRQ_NUM - 1);
 181
 182         for (i=0; i<VOYAGER_IRQ_NUM; i++) {
 183                 flag = 0;
 184                 switch (VOYAGER_IRQ_BASE + i) {
 185                 case VOYAGER_USBH_IRQ:
 186                 case VOYAGER_8051_IRQ:
 187                 case VOYAGER_UART0_IRQ:
 188                 case VOYAGER_UART1_IRQ:
 189                 case VOYAGER_AC97_IRQ:
 190                         flag = 1;
 191                 }
 192                 if (flag == 1)
 193                         irq_desc[VOYAGER_IRQ_BASE + i].chip = &voyagergx_irq_type;
 194         }
 195
 196         setup_irq(IRQ_VOYAGER, &irq0);
 197 }
 198