arch/sh/cchips/hd6446x/hd64461.c

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