arch/frv/kernel/irq-mb93493.c

   1 /* irq-mb93493.c: MB93493 companion chip interrupt handler
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/ptrace.h>
  13 #include <linux/errno.h>
  14 #include <linux/signal.h>
  15 #include <linux/sched.h>
  16 #include <linux/ioport.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/init.h>
  19 #include <linux/irq.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/system.h>
  23 #include <asm/bitops.h>
  24 #include <asm/delay.h>
  25 #include <asm/irq.h>
  26 #include <asm/irc-regs.h>
  27 #include <asm/irq-routing.h>
  28 #include <asm/mb93493-irqs.h>
  29
  30 static void frv_mb93493_doirq(struct irq_source *source);
  31
  32 /*****************************************************************************/
  33 /*
  34  * MB93493 companion chip IRQ multiplexor
  35  */
  36 static struct irq_source frv_mb93493[2] = {
  37         [0] = {
  38                 .muxname                = "mb93493.0",
  39                 .muxdata                = __region_CS3 + 0x3d0,
  40                 .doirq                  = frv_mb93493_doirq,
  41                 .irqmask                = 0x0000,
  42         },
  43         [1] = {
  44                 .muxname                = "mb93493.1",
  45                 .muxdata                = __region_CS3 + 0x3d4,
  46                 .doirq                  = frv_mb93493_doirq,
  47                 .irqmask                = 0x0000,
  48         },
  49 };
  50
  51 static void frv_mb93493_control(struct irq_group *group, int index, int on)
  52 {
  53         struct irq_source *source;
  54         uint32_t iqsr;
  55
  56         if ((frv_mb93493[0].irqmask & (1 << index)))
  57                 source = &frv_mb93493[0];
  58         else
  59                 source = &frv_mb93493[1];
  60
  61         iqsr = readl(source->muxdata);
  62         if (on)
  63                 iqsr |= 1 << (index + 16);
  64         else
  65                 iqsr &= ~(1 << (index + 16));
  66
  67         writel(iqsr, source->muxdata);
  68 }
  69
  70 static struct irq_group frv_mb93493_irqs = {
  71         .first_irq      = IRQ_BASE_MB93493,
  72         .control        = frv_mb93493_control,
  73 };
  74
  75 static void frv_mb93493_doirq(struct irq_source *source)
  76 {
  77         uint32_t mask = readl(source->muxdata);
  78         mask = mask & (mask >> 16) & 0xffff;
  79
  80         if (mask)
  81                 distribute_irqs(&frv_mb93493_irqs, mask);
  82 }
  83
  84 static void __init mb93493_irq_route(int irq, int source)
  85 {
  86         frv_mb93493[source].irqmask |= 1 << (irq - IRQ_BASE_MB93493);
  87         frv_mb93493_irqs.sources[irq - IRQ_BASE_MB93493] = &frv_mb93493[source];
  88 }
  89
  90 void __init route_mb93493_irqs(void)
  91 {
  92         frv_irq_route_external(&frv_mb93493[0], IRQ_CPU_MB93493_0);
  93         frv_irq_route_external(&frv_mb93493[1], IRQ_CPU_MB93493_1);
  94
  95         frv_irq_set_group(&frv_mb93493_irqs);
  96
  97         mb93493_irq_route(IRQ_MB93493_VDC,              IRQ_MB93493_VDC_ROUTE);
  98         mb93493_irq_route(IRQ_MB93493_VCC,              IRQ_MB93493_VCC_ROUTE);
  99         mb93493_irq_route(IRQ_MB93493_AUDIO_IN,         IRQ_MB93493_AUDIO_IN_ROUTE);
 100         mb93493_irq_route(IRQ_MB93493_I2C_0,            IRQ_MB93493_I2C_0_ROUTE);
 101         mb93493_irq_route(IRQ_MB93493_I2C_1,            IRQ_MB93493_I2C_1_ROUTE);
 102         mb93493_irq_route(IRQ_MB93493_USB,              IRQ_MB93493_USB_ROUTE);
 103         mb93493_irq_route(IRQ_MB93493_LOCAL_BUS,        IRQ_MB93493_LOCAL_BUS_ROUTE);
 104         mb93493_irq_route(IRQ_MB93493_PCMCIA,           IRQ_MB93493_PCMCIA_ROUTE);
 105         mb93493_irq_route(IRQ_MB93493_GPIO,             IRQ_MB93493_GPIO_ROUTE);
 106         mb93493_irq_route(IRQ_MB93493_AUDIO_OUT,        IRQ_MB93493_AUDIO_OUT_ROUTE);
 107 }