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