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 /* This belongs in cpu specific */
  18 #define INTC_ICR1 0xA4140010UL
  19
  20 static void disable_hd64461_irq(unsigned int irq)
  21 {
  22         unsigned short nimr;
  23         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  24
  25         nimr = inw(HD64461_NIMR);
  26         nimr |= mask;
  27         outw(nimr, HD64461_NIMR);
  28 }
  29
  30 static void enable_hd64461_irq(unsigned int irq)
  31 {
  32         unsigned short nimr;
  33         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  34
  35         nimr = inw(HD64461_NIMR);
  36         nimr &= ~mask;
  37         outw(nimr, HD64461_NIMR);
  38 }
  39
  40 static void mask_and_ack_hd64461(unsigned int irq)
  41 {
  42         disable_hd64461_irq(irq);
  43 #ifdef CONFIG_HD64461_ENABLER
  44         if (irq == HD64461_IRQBASE + 13)
  45                 outb(0x00, HD64461_PCC1CSCR);
  46 #endif
  47 }
  48
  49 static void end_hd64461_irq(unsigned int irq)
  50 {
  51         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  52                 enable_hd64461_irq(irq);
  53 }
  54
  55 static unsigned int startup_hd64461_irq(unsigned int irq)
  56 {
  57         enable_hd64461_irq(irq);
  58         return 0;
  59 }
  60
  61 static void shutdown_hd64461_irq(unsigned int irq)
  62 {
  63         disable_hd64461_irq(irq);
  64 }
  65
  66 static struct hw_interrupt_type hd64461_irq_type = {
  67         .typename       = "HD64461-IRQ",
  68         .startup        = startup_hd64461_irq,
  69         .shutdown       = shutdown_hd64461_irq,
  70         .enable         = enable_hd64461_irq,
  71         .disable        = disable_hd64461_irq,
  72         .ack            = mask_and_ack_hd64461,
  73         .end            = end_hd64461_irq,
  74 };
  75
  76 static irqreturn_t hd64461_interrupt(int irq, void *dev_id)
  77 {
  78         printk(KERN_INFO
  79                "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
  80                inw(HD64461_NIRR), inw(HD64461_NIMR));
  81
  82         return IRQ_NONE;
  83 }
  84
  85 static struct {
  86         int (*func) (int, void *);
  87         void *dev;
  88 } hd64461_demux[HD64461_IRQ_NUM];
  89
  90 void hd64461_register_irq_demux(int irq,
  91                                 int (*demux) (int irq, void *dev), void *dev)
  92 {
  93         hd64461_demux[irq - HD64461_IRQBASE].func = demux;
  94         hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
  95 }
  96
  97 EXPORT_SYMBOL(hd64461_register_irq_demux);
  98
  99 void hd64461_unregister_irq_demux(int irq)
 100 {
 101         hd64461_demux[irq - HD64461_IRQBASE].func = 0;
 102 }
 103
 104 EXPORT_SYMBOL(hd64461_unregister_irq_demux);
 105
 106 int hd64461_irq_demux(int irq)
 107 {
 108         if (irq == CONFIG_HD64461_IRQ) {
 109                 unsigned short bit;
 110                 unsigned short nirr = inw(HD64461_NIRR);
 111                 unsigned short nimr = inw(HD64461_NIMR);
 112                 int i;
 113
 114                 nirr &= ~nimr;
 115                 for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
 116                         if (nirr & bit)
 117                                 break;
 118                 if (i == 16)
 119                         irq = CONFIG_HD64461_IRQ;
 120                 else {
 121                         irq = HD64461_IRQBASE + i;
 122                         if (hd64461_demux[i].func != 0) {
 123                                 irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
 124                         }
 125                 }
 126         }
 127         return irq;
 128 }
 129
 130 static struct irqaction irq0 = {
 131         .handler = hd64461_interrupt,
 132         .flags = IRQF_DISABLED,
 133         .mask = CPU_MASK_NONE,
 134         .name = "HD64461",
 135 };
 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         /*  IRQ 80 -> 95 belongs to HD64461  */
 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);