arch/arm/mach-lh7a40x/irq-kev7a400.c

   1 /* arch/arm/mach-lh7a40x/irq-kev7a400.c
   2  *
   3  *  Copyright (C) 2004 Coastal Environmental Systems
   4  *
   5  *  This program is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU General Public License
   7  *  version 2 as published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/interrupt.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/irq.h>
  15 #include <asm/mach/irq.h>
  16 #include <asm/mach/hardware.h>
  17 #include <asm/mach/irqs.h>
  18
  19
  20   /* KEV7a400 CPLD IRQ handling */
  21
  22 static u16 CPLD_IRQ_mask;       /* Mask for CPLD IRQs, 1 == unmasked */
  23
  24 static void
  25 lh7a400_ack_cpld_irq (u32 irq)
  26 {
  27         CPLD_CL_INT = 1 << (irq - IRQ_KEV7A400_CPLD);
  28 }
  29
  30 static void
  31 lh7a400_mask_cpld_irq (u32 irq)
  32 {
  33         CPLD_IRQ_mask &= ~(1 << (irq - IRQ_KEV7A400_CPLD));
  34         CPLD_WR_PB_INT_MASK = CPLD_IRQ_mask;
  35 }
  36
  37 static void
  38 lh7a400_unmask_cpld_irq (u32 irq)
  39 {
  40         CPLD_IRQ_mask |= 1 << (irq - IRQ_KEV7A400_CPLD);
  41         CPLD_WR_PB_INT_MASK = CPLD_IRQ_mask;
  42 }
  43
  44 static struct
  45 irqchip lh7a400_cpld_chip = {
  46         .ack    = lh7a400_ack_cpld_irq,
  47         .mask   = lh7a400_mask_cpld_irq,
  48         .unmask = lh7a400_unmask_cpld_irq,
  49 };
  50
  51 static void
  52 lh7a400_cpld_handler (unsigned int irq, struct irqdesc *desc,
  53                       struct pt_regs *regs)
  54 {
  55         u32 mask = CPLD_LATCHED_INTS;
  56         irq = IRQ_KEV_7A400_CPLD;
  57         for (; mask; mask >>= 1, ++irq) {
  58                 if (mask & 1)
  59                         desc[irq].handle (irq, desc, regs);
  60         }
  61 }
  62
  63   /* IRQ initialization */
  64
  65 void __init
  66 lh7a400_init_board_irq (void)
  67 {
  68         int irq;
  69
  70         for (irq = IRQ_KEV7A400_CPLD;
  71              irq < IRQ_KEV7A400_CPLD + NR_IRQ_KEV7A400_CPLD; ++irq) {
  72                 set_irq_chip (irq, &lh7a400_cpld_chip);
  73                 set_irq_handler (irq, do_edge_IRQ);
  74                 set_irq_flags (irq, IRQF_VALID);
  75         }
  76         set_irq_chained_handler (IRQ_CPLD, kev7a400_cpld_handler);
  77
  78                 /* Clear all CPLD interrupts */
  79         CPLD_CL_INT = 0xff; /* CPLD_INTR_MMC_CD | CPLD_INTR_ETH_INT; */
  80
  81     /* *** FIXME CF enabled in ide-probe.c */
  82
  83         GPIO_GPIOINTEN = 0;             /* Disable all GPIO interrupts */
  84         barrier();
  85         GPIO_INTTYPE1
  86                 = (GPIO_INTR_PCC1_CD | GPIO_INTR_PCC1_CD); /* Edge trig. */
  87         GPIO_INTTYPE2 = 0;              /* Falling edge & low-level */
  88         GPIO_GPIOFEOI = 0xff;           /* Clear all GPIO interrupts */
  89         GPIO_GPIOINTEN = 0xff;          /* Enable all GPIO interrupts */
  90
  91         init_FIQ();
  92 }