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irq-kev7a400.c

/* arch/arm/mach-lh7a40x/irq-kev7a400.c
 *
 *  Copyright (C) 2004 Coastal Environmental Systems
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  version 2 as published by the Free Software Foundation.
 *
 */

#include <linux/interrupt.h>
#include <linux/init.h>

#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/mach/hardware.h>
#include <asm/mach/irqs.h>

#include "common.h"

  /* KEV7a400 CPLD IRQ handling */

static u16 CPLD_IRQ_mask;     /* Mask for CPLD IRQs, 1 == unmasked */

static void
lh7a400_ack_cpld_irq (u32 irq)
{
      CPLD_CL_INT = 1 << (irq - IRQ_KEV7A400_CPLD);
}

static void
lh7a400_mask_cpld_irq (u32 irq)
{
      CPLD_IRQ_mask &= ~(1 << (irq - IRQ_KEV7A400_CPLD));
      CPLD_WR_PB_INT_MASK = CPLD_IRQ_mask;
}

static void
lh7a400_unmask_cpld_irq (u32 irq)
{
      CPLD_IRQ_mask |= 1 << (irq - IRQ_KEV7A400_CPLD);
      CPLD_WR_PB_INT_MASK = CPLD_IRQ_mask;
}

static struct
irq_chip lh7a400_cpld_chip = {
      .name = "CPLD",
      .ack  = lh7a400_ack_cpld_irq,
      .mask = lh7a400_mask_cpld_irq,
      .unmask     = lh7a400_unmask_cpld_irq,
};

static void
lh7a400_cpld_handler (unsigned int irq, struct irqdesc *desc,
                  struct pt_regs *regs)
{
      u32 mask = CPLD_LATCHED_INTS;
      irq = IRQ_KEV_7A400_CPLD;
      for (; mask; mask >>= 1, ++irq) {
            if (mask & 1)
                  desc[irq].handle (irq, desc, regs);
      }
}

  /* IRQ initialization */

void __init
lh7a400_init_board_irq (void)
{
      int irq;

      for (irq = IRQ_KEV7A400_CPLD;
           irq < IRQ_KEV7A400_CPLD + NR_IRQ_KEV7A400_CPLD; ++irq) {
            set_irq_chip (irq, &lh7a400_cpld_chip);
            set_irq_handler (irq, do_edge_IRQ);
            set_irq_flags (irq, IRQF_VALID);
      }
      set_irq_chained_handler (IRQ_CPLD, kev7a400_cpld_handler);

            /* Clear all CPLD interrupts */
      CPLD_CL_INT = 0xff; /* CPLD_INTR_MMC_CD | CPLD_INTR_ETH_INT; */

    /* *** FIXME CF enabled in ide-probe.c */

      GPIO_GPIOINTEN = 0;           /* Disable all GPIO interrupts */
      barrier();
      GPIO_INTTYPE1
            = (GPIO_INTR_PCC1_CD | GPIO_INTR_PCC1_CD); /* Edge trig. */
      GPIO_INTTYPE2 = 0;            /* Falling edge & low-level */
      GPIO_GPIOFEOI = 0xff;         /* Clear all GPIO interrupts */
      GPIO_GPIOINTEN = 0xff;        /* Enable all GPIO interrupts */

      init_FIQ();
}

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