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irq.c

/*
 * linux/arch/sh/boards/renesas/hs7751rvoip/irq.c
 *
 * Copyright (C) 2000  Kazumoto Kojima
 *
 * Renesas Technology Sales HS7751RVoIP Support.
 *
 * Modified for HS7751RVoIP by
 * Atom Create Engineering Co., Ltd. 2002.
 * Lineo uSolutions, Inc. 2003.
 */

#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hs7751rvoip.h>

static int mask_pos[] = {8, 9, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7};

static void enable_hs7751rvoip_irq(unsigned int irq);
static void disable_hs7751rvoip_irq(unsigned int irq);

/* shutdown is same as "disable" */
#define shutdown_hs7751rvoip_irq disable_hs7751rvoip_irq

static void ack_hs7751rvoip_irq(unsigned int irq);
static void end_hs7751rvoip_irq(unsigned int irq);

static unsigned int startup_hs7751rvoip_irq(unsigned int irq)
{
      enable_hs7751rvoip_irq(irq);
      return 0; /* never anything pending */
}

static void disable_hs7751rvoip_irq(unsigned int irq)
{
      unsigned short val;
      unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);

      /* Set the priority in IPR to 0 */
      val = ctrl_inw(IRLCNTR3);
      val &= mask;
      ctrl_outw(val, IRLCNTR3);
}

static void enable_hs7751rvoip_irq(unsigned int irq)
{
      unsigned short val;
      unsigned short value = (0x0001 << mask_pos[irq]);

      /* Set priority in IPR back to original value */
      val = ctrl_inw(IRLCNTR3);
      val |= value;
      ctrl_outw(val, IRLCNTR3);
}

static void ack_hs7751rvoip_irq(unsigned int irq)
{
      disable_hs7751rvoip_irq(irq);
}

static void end_hs7751rvoip_irq(unsigned int irq)
{
      if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
            enable_hs7751rvoip_irq(irq);
}

static struct hw_interrupt_type hs7751rvoip_irq_type = {
      .typename =  "HS7751RVoIP IRQ",
      .startup = startup_hs7751rvoip_irq,
      .shutdown = shutdown_hs7751rvoip_irq,
      .enable = enable_hs7751rvoip_irq,
      .disable = disable_hs7751rvoip_irq,
      .ack = ack_hs7751rvoip_irq,
      .end = end_hs7751rvoip_irq,
};

static void make_hs7751rvoip_irq(unsigned int irq)
{
      disable_irq_nosync(irq);
      irq_desc[irq].chip = &hs7751rvoip_irq_type;
      disable_hs7751rvoip_irq(irq);
}

/*
 * Initialize IRQ setting
 */
void __init init_hs7751rvoip_IRQ(void)
{
      int i;

      /* IRL0=ON HOOK1
       * IRL1=OFF HOOK1
       * IRL2=ON HOOK2
       * IRL3=OFF HOOK2
       * IRL4=Ringing Detection
       * IRL5=CODEC
       * IRL6=Ethernet
       * IRL7=Ethernet Hub
       * IRL8=USB Communication
       * IRL9=USB Connection
       * IRL10=USB DMA
       * IRL11=CF Card
       * IRL12=PCMCIA
       * IRL13=PCI Slot
       */
      ctrl_outw(0x9876, IRLCNTR1);
      ctrl_outw(0xdcba, IRLCNTR2);
      ctrl_outw(0x0050, IRLCNTR4);
      ctrl_outw(0x4321, IRLCNTR5);

      for (i=0; i<14; i++)
            make_hs7751rvoip_irq(i);
}

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