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