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hd64461.c

/*
 *    Copyright (C) 2000 YAEGASHI Takeshi
 *    Hitachi HD64461 companion chip support
 */

#include <linux/sched.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hd64461.h>

/* This belongs in cpu specific */
#define INTC_ICR1 0xA4140010UL

static void disable_hd64461_irq(unsigned int irq)
{
      unsigned short nimr;
      unsigned short mask = 1 << (irq - HD64461_IRQBASE);

      nimr = inw(HD64461_NIMR);
      nimr |= mask;
      outw(nimr, HD64461_NIMR);
}

static void enable_hd64461_irq(unsigned int irq)
{
      unsigned short nimr;
      unsigned short mask = 1 << (irq - HD64461_IRQBASE);

      nimr = inw(HD64461_NIMR);
      nimr &= ~mask;
      outw(nimr, HD64461_NIMR);
}

static void mask_and_ack_hd64461(unsigned int irq)
{
      disable_hd64461_irq(irq);
#ifdef CONFIG_HD64461_ENABLER
      if (irq == HD64461_IRQBASE + 13)
            outb(0x00, HD64461_PCC1CSCR);
#endif
}

static void end_hd64461_irq(unsigned int irq)
{
      if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
            enable_hd64461_irq(irq);
}

static unsigned int startup_hd64461_irq(unsigned int irq)
{
      enable_hd64461_irq(irq);
      return 0;
}

static void shutdown_hd64461_irq(unsigned int irq)
{
      disable_hd64461_irq(irq);
}

static struct hw_interrupt_type hd64461_irq_type = {
      .typename   = "HD64461-IRQ",
      .startup    = startup_hd64461_irq,
      .shutdown   = shutdown_hd64461_irq,
      .enable           = enable_hd64461_irq,
      .disable    = disable_hd64461_irq,
      .ack        = mask_and_ack_hd64461,
      .end        = end_hd64461_irq,
};

static irqreturn_t hd64461_interrupt(int irq, void *dev_id)
{
      printk(KERN_INFO
             "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
             inw(HD64461_NIRR), inw(HD64461_NIMR));

      return IRQ_NONE;
}

static struct {
      int (*func) (int, void *);
      void *dev;
} hd64461_demux[HD64461_IRQ_NUM];

void hd64461_register_irq_demux(int irq,
                        int (*demux) (int irq, void *dev), void *dev)
{
      hd64461_demux[irq - HD64461_IRQBASE].func = demux;
      hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
}

EXPORT_SYMBOL(hd64461_register_irq_demux);

void hd64461_unregister_irq_demux(int irq)
{
      hd64461_demux[irq - HD64461_IRQBASE].func = 0;
}

EXPORT_SYMBOL(hd64461_unregister_irq_demux);

int hd64461_irq_demux(int irq)
{
      if (irq == CONFIG_HD64461_IRQ) {
            unsigned short bit;
            unsigned short nirr = inw(HD64461_NIRR);
            unsigned short nimr = inw(HD64461_NIMR);
            int i;

            nirr &= ~nimr;
            for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
                  if (nirr & bit)
                        break;
            if (i == 16)
                  irq = CONFIG_HD64461_IRQ;
            else {
                  irq = HD64461_IRQBASE + i;
                  if (hd64461_demux[i].func != 0) {
                        irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
                  }
            }
      }
      return irq;
}

static struct irqaction irq0 = {
      .handler = hd64461_interrupt,
      .flags = IRQF_DISABLED,
      .mask = CPU_MASK_NONE,
      .name = "HD64461",
};

int __init setup_hd64461(void)
{
      int i;

      if (!MACH_HD64461)
            return 0;

      printk(KERN_INFO
             "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
             CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
             HD64461_IRQBASE + 15);

#if defined(CONFIG_CPU_SUBTYPE_SH7709)    /* Should be at processor specific part.. */
      outw(0x2240, INTC_ICR1);
#endif
      outw(0xffff, HD64461_NIMR);

      /*  IRQ 80 -> 95 belongs to HD64461  */
      for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
            irq_desc[i].chip = &hd64461_irq_type;
      }

      setup_irq(CONFIG_HD64461_IRQ, &irq0);

#ifdef CONFIG_HD64461_ENABLER
      printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
      outb(0x4c, HD64461_PCC1CSCIER);
      outb(0x00, HD64461_PCC1CSCR);
#endif

      return 0;
}

module_init(setup_hd64461);

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