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   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/config.h>
  13 #include <linux/ptrace.h>
  14 #include <linux/errno.h>
  15 #include <linux/signal.h>
  16 #include <linux/sched.h>
  17 #include <linux/ioport.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/init.h>
  20 #include <linux/irq.h>
  21
  22 #include <asm/io.h>
  23 #include <asm/system.h>
  24 #include <asm/bitops.h>
  25 #include <asm/delay.h>
  26 #include <asm/irq.h>
  27 #include <asm/irc-regs.h>
  28 #include <asm/irq-routing.h>
  29 #include <asm/mb93493-irqs.h>
  30
  31 static void frv_mb93493_doirq(struct irq_source *source);
  32
  33 /*****************************************************************************/
  34 /*
  35  * MB93493 companion chip IRQ multiplexor
  36  */
  37 static struct irq_source frv_mb93493[2] = {
  38         [0] = {
  39                 .muxname                = "mb93493.0",
  40                 .muxdata                = __region_CS3 + 0x3d0,
  41                 .doirq                  = frv_mb93493_doirq,
  42                 .irqmask                = 0x0000,
  43         },
  44         [1] = {
  45                 .muxname                = "mb93493.1",
  46                 .muxdata                = __region_CS3 + 0x3d4,
  47                 .doirq                  = frv_mb93493_doirq,
  48                 .irqmask                = 0x0000,
  49         },
  50 };
  51
  52 static void frv_mb93493_control(struct irq_group *group, int index, int on)
  53 {
  54         struct irq_source *source;
  55         uint32_t iqsr;
  56
  57         if ((frv_mb93493[0].irqmask & (1 << index)))
  58                 source = &frv_mb93493[0];
  59         else
  60                 source = &frv_mb93493[1];
  61
  62         iqsr = readl(source->muxdata);
  63         if (on)
  64                 iqsr |= 1 << (index + 16);
  65         else
  66                 iqsr &= ~(1 << (index + 16));
  67
  68         writel(iqsr, source->muxdata);
  69 }
  70
  71 static struct irq_group frv_mb93493_irqs = {
  72         .first_irq      = IRQ_BASE_MB93493,
  73         .control        = frv_mb93493_control,
  74 };
  75
  76 static void frv_mb93493_doirq(struct irq_source *source)
  77 {
  78         uint32_t mask = readl(source->muxdata);
  79         mask = mask & (mask >> 16) & 0xffff;
  80
  81         if (mask)
  82                 distribute_irqs(&frv_mb93493_irqs, mask);
  83 }
  84
  85 static void __init mb93493_irq_route(int irq, int source)
  86 {
  87         frv_mb93493[source].irqmask |= 1 << (irq - IRQ_BASE_MB93493);
  88         frv_mb93493_irqs.sources[irq - IRQ_BASE_MB93493] = &frv_mb93493[source];
  89 }
  90
  91 void __init route_mb93493_irqs(void)
  92 {
  93         frv_irq_route_external(&frv_mb93493[0], IRQ_CPU_MB93493_0);
  94         frv_irq_route_external(&frv_mb93493[1], IRQ_CPU_MB93493_1);
  95
  96         frv_irq_set_group(&frv_mb93493_irqs);
  97
  98         mb93493_irq_route(IRQ_MB93493_VDC,              IRQ_MB93493_VDC_ROUTE);
  99         mb93493_irq_route(IRQ_MB93493_VCC,              IRQ_MB93493_VCC_ROUTE);
 100         mb93493_irq_route(IRQ_MB93493_AUDIO_IN,         IRQ_MB93493_AUDIO_IN_ROUTE);
 101         mb93493_irq_route(IRQ_MB93493_I2C_0,            IRQ_MB93493_I2C_0_ROUTE);
 102         mb93493_irq_route(IRQ_MB93493_I2C_1,            IRQ_MB93493_I2C_1_ROUTE);
 103         mb93493_irq_route(IRQ_MB93493_USB,              IRQ_MB93493_USB_ROUTE);
 104         mb93493_irq_route(IRQ_MB93493_LOCAL_BUS,        IRQ_MB93493_LOCAL_BUS_ROUTE);
 105         mb93493_irq_route(IRQ_MB93493_PCMCIA,           IRQ_MB93493_PCMCIA_ROUTE);
 106         mb93493_irq_route(IRQ_MB93493_GPIO,             IRQ_MB93493_GPIO_ROUTE);
 107         mb93493_irq_route(IRQ_MB93493_AUDIO_OUT,        IRQ_MB93493_AUDIO_OUT_ROUTE);
 108 }