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
  15 #include <asm/io.h>
  16 #include <asm/irq.h>
  17 #include <asm/hd64461.h>
  18
  19 static void disable_hd64461_irq(unsigned int irq)
  20 {
  21         unsigned long flags;
  22         unsigned short nimr;
  23         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  24
  25         local_irq_save(flags);
  26         nimr = inw(HD64461_NIMR);
  27         nimr |= mask;
  28         outw(nimr, HD64461_NIMR);
  29         local_irq_restore(flags);
  30 }
  31
  32 static void enable_hd64461_irq(unsigned int irq)
  33 {
  34         unsigned long flags;
  35         unsigned short nimr;
  36         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  37
  38         local_irq_save(flags);
  39         nimr = inw(HD64461_NIMR);
  40         nimr &= ~mask;
  41         outw(nimr, HD64461_NIMR);
  42         local_irq_restore(flags);
  43 }
  44
  45 static void mask_and_ack_hd64461(unsigned int irq)
  46 {
  47         disable_hd64461_irq(irq);
  48 #ifdef CONFIG_HD64461_ENABLER
  49         if (irq == HD64461_IRQBASE + 13)
  50                 outb(0x00, HD64461_PCC1CSCR);
  51 #endif
  52 }
  53
  54 static void end_hd64461_irq(unsigned int irq)
  55 {
  56         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  57                 enable_hd64461_irq(irq);
  58 }
  59
  60 static unsigned int startup_hd64461_irq(unsigned int irq)
  61 {
  62         enable_hd64461_irq(irq);
  63         return 0;
  64 }
  65
  66 static void shutdown_hd64461_irq(unsigned int irq)
  67 {
  68         disable_hd64461_irq(irq);
  69 }
  70
  71 static struct hw_interrupt_type hd64461_irq_type = {
  72         .typename       = "HD64461-IRQ",
  73         .startup        = startup_hd64461_irq,
  74         .shutdown       = shutdown_hd64461_irq,
  75         .enable         = enable_hd64461_irq,
  76         .disable        = disable_hd64461_irq,
  77         .ack            = mask_and_ack_hd64461,
  78         .end            = end_hd64461_irq,
  79 };
  80
  81 static irqreturn_t hd64461_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  82 {
  83         printk(KERN_INFO
  84                "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
  85                inw(HD64461_NIRR), inw(HD64461_NIMR));
  86
  87         return IRQ_NONE;
  88 }
  89
  90 static struct {
  91         int (*func) (int, void *);
  92         void *dev;
  93 } hd64461_demux[HD64461_IRQ_NUM];
  94
  95 void hd64461_register_irq_demux(int irq,
  96                                 int (*demux) (int irq, void *dev), void *dev)
  97 {
  98         hd64461_demux[irq - HD64461_IRQBASE].func = demux;
  99         hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
 100 }
 101
 102 EXPORT_SYMBOL(hd64461_register_irq_demux);
 103
 104 void hd64461_unregister_irq_demux(int irq)
 105 {
 106         hd64461_demux[irq - HD64461_IRQBASE].func = 0;
 107 }
 108
 109 EXPORT_SYMBOL(hd64461_unregister_irq_demux);
 110
 111 int hd64461_irq_demux(int irq)
 112 {
 113         if (irq == CONFIG_HD64461_IRQ) {
 114                 unsigned short bit;
 115                 unsigned short nirr = inw(HD64461_NIRR);
 116                 unsigned short nimr = inw(HD64461_NIMR);
 117                 int i;
 118
 119                 nirr &= ~nimr;
 120                 for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
 121                         if (nirr & bit)
 122                                 break;
 123                 if (i == 16)
 124                         irq = CONFIG_HD64461_IRQ;
 125                 else {
 126                         irq = HD64461_IRQBASE + i;
 127                         if (hd64461_demux[i].func != 0) {
 128                                 irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
 129                         }
 130                 }
 131         }
 132         return __irq_demux(irq);
 133 }
 134
 135 static struct irqaction irq0 = { hd64461_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64461", NULL, NULL };
 136
 137 int __init setup_hd64461(void)
 138 {
 139         int i;
 140
 141         if (!MACH_HD64461)
 142                 return 0;
 143
 144         printk(KERN_INFO
 145                "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
 146                CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
 147                HD64461_IRQBASE + 15);
 148
 149 #if defined(CONFIG_CPU_SUBTYPE_SH7709)  /* Should be at processor specific part.. */
 150         outw(0x2240, INTC_ICR1);
 151 #endif
 152         outw(0xffff, HD64461_NIMR);
 153
 154         for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
 155                 irq_desc[i].chip = &hd64461_irq_type;
 156         }
 157
 158         setup_irq(CONFIG_HD64461_IRQ, &irq0);
 159
 160 #ifdef CONFIG_HD64461_ENABLER
 161         printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
 162         outb(0x4c, HD64461_PCC1CSCIER);
 163         outb(0x00, HD64461_PCC1CSCR);
 164 #endif
 165
 166         return 0;
 167 }
 168
 169 module_init(setup_hd64461);