arch/sh/cchips/hd6446x/hd64461/setup.c

   1 /*
   2  *      $Id: setup.c,v 1.5 2004/03/16 00:07:50 lethal Exp $
   3  *      Copyright (C) 2000 YAEGASHI Takeshi
   4  *      Hitachi HD64461 companion chip support
   5  */
   6
   7 #include <linux/sched.h>
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/param.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <asm/io.h>
  15 #include <asm/irq.h>
  16 #include <asm/hd64461.h>
  17
  18 static void disable_hd64461_irq(unsigned int irq)
  19 {
  20         unsigned short nimr;
  21         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  22
  23         nimr = inw(HD64461_NIMR);
  24         nimr |= mask;
  25         outw(nimr, HD64461_NIMR);
  26 }
  27
  28 static void enable_hd64461_irq(unsigned int irq)
  29 {
  30         unsigned short nimr;
  31         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  32
  33         nimr = inw(HD64461_NIMR);
  34         nimr &= ~mask;
  35         outw(nimr, HD64461_NIMR);
  36 }
  37
  38 static void mask_and_ack_hd64461(unsigned int irq)
  39 {
  40         disable_hd64461_irq(irq);
  41 #ifdef CONFIG_HD64461_ENABLER
  42         if (irq == HD64461_IRQBASE + 13)
  43                 outb(0x00, HD64461_PCC1CSCR);
  44 #endif
  45 }
  46
  47 static void end_hd64461_irq(unsigned int irq)
  48 {
  49         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  50                 enable_hd64461_irq(irq);
  51 }
  52
  53 static unsigned int startup_hd64461_irq(unsigned int irq)
  54 {
  55         enable_hd64461_irq(irq);
  56         return 0;
  57 }
  58
  59 static void shutdown_hd64461_irq(unsigned int irq)
  60 {
  61         disable_hd64461_irq(irq);
  62 }
  63
  64 static struct hw_interrupt_type hd64461_irq_type = {
  65         .typename       = "HD64461-IRQ",
  66         .startup        = startup_hd64461_irq,
  67         .shutdown       = shutdown_hd64461_irq,
  68         .enable         = enable_hd64461_irq,
  69         .disable        = disable_hd64461_irq,
  70         .ack            = mask_and_ack_hd64461,
  71         .end            = end_hd64461_irq,
  72 };
  73
  74 static irqreturn_t hd64461_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  75 {
  76         printk(KERN_INFO
  77                "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
  78                inw(HD64461_NIRR), inw(HD64461_NIMR));
  79
  80         return IRQ_NONE;
  81 }
  82
  83 static struct {
  84         int (*func) (int, void *);
  85         void *dev;
  86 } hd64461_demux[HD64461_IRQ_NUM];
  87
  88 void hd64461_register_irq_demux(int irq,
  89                                 int (*demux) (int irq, void *dev), void *dev)
  90 {
  91         hd64461_demux[irq - HD64461_IRQBASE].func = demux;
  92         hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
  93 }
  94
  95 EXPORT_SYMBOL(hd64461_register_irq_demux);
  96
  97 void hd64461_unregister_irq_demux(int irq)
  98 {
  99         hd64461_demux[irq - HD64461_IRQBASE].func = 0;
 100 }
 101
 102 EXPORT_SYMBOL(hd64461_unregister_irq_demux);
 103
 104 int hd64461_irq_demux(int irq)
 105 {
 106         if (irq == CONFIG_HD64461_IRQ) {
 107                 unsigned short bit;
 108                 unsigned short nirr = inw(HD64461_NIRR);
 109                 unsigned short nimr = inw(HD64461_NIMR);
 110                 int i;
 111
 112                 nirr &= ~nimr;
 113                 for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
 114                         if (nirr & bit)
 115                                 break;
 116                 if (i == 16)
 117                         irq = CONFIG_HD64461_IRQ;
 118                 else {
 119                         irq = HD64461_IRQBASE + i;
 120                         if (hd64461_demux[i].func != 0) {
 121                                 irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
 122                         }
 123                 }
 124         }
 125         return __irq_demux(irq);
 126 }
 127
 128 static struct irqaction irq0 = { hd64461_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64461", NULL, NULL };
 129
 130 int __init setup_hd64461(void)
 131 {
 132         int i;
 133
 134         if (!MACH_HD64461)
 135                 return 0;
 136
 137         printk(KERN_INFO
 138                "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
 139                CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
 140                HD64461_IRQBASE + 15);
 141
 142 #if defined(CONFIG_CPU_SUBTYPE_SH7709)  /* Should be at processor specific part.. */
 143         outw(0x2240, INTC_ICR1);
 144 #endif
 145         outw(0xffff, HD64461_NIMR);
 146
 147         for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
 148                 irq_desc[i].chip = &hd64461_irq_type;
 149         }
 150
 151         setup_irq(CONFIG_HD64461_IRQ, &irq0);
 152
 153 #ifdef CONFIG_HD64461_ENABLER
 154         printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
 155         outb(0x4c, HD64461_PCC1CSCIER);
 156         outb(0x00, HD64461_PCC1CSCR);
 157 #endif
 158
 159         return 0;
 160 }
 161
 162 module_init(setup_hd64461);